DMTDA, dimethyl thio-toluene diamine (CAS 106264-79-3), is a liquid aromatic diamine used as a polyurethane chain extender and epoxy curing agent. Its published specification lists diamines at 95% minimum, water at 0.10% maximum and amine value 515-535 mg KOH/g. Epoxy equivalent weight is 53.6 g/eq. Figure 1. DMTDA as supplied: a light yellow liquid in a glass sample bottle. Product Code: DMTDA Chemical Name: Dimethyl thio-toluene diamine CAS No.: 106264-79-3 Product Category: Aromatic diamine chain extender and epoxy curing agent 1. Introduction DMTDA (CAS 106264-79-3) is a room-temperature liquid aromatic diamine that removes the melt step solid curatives require. Cast polyurethane elastomers and polyurea coatings use aromatic diamines because the rigid ring lifts hardness, modulus and heat resistance above what a polyether amine reaches. The price is reactivity. The published specification is short: appearance, diamine content, toluenediamine (TDA) content, water and amine value. Everything else, from equivalent weight to blend ratio, has to be derived. All numbers come from the public product page. Constants it does not publish are marked calculated, and dosage figures are worked examples. 2. Materials and Methods: DMTDA Identification and Specification The product page publishes five specification items, and DMTDA ships as one liquid grade in drums. 2.1 Product Identification and Specification Table 1 collects the identification data used here, and Table 2 reproduces the published specification. Table 1. Identification data of DMTDA (CAS 106264-79-3). Item Information Product name DMTDA Chemical name Dimethyl thio-toluene diamine CAS No. 106264-79-3 Molecular formula C9H14N2S2 (calculated) Molecular mass 214.3 g/mol (calculated) Amine functionality two primary amines, four active hydrogens Table 2. Published specification of DMTDA, taken from the product page. Item Specification Appearance Light yellow viscous liquid Diamine content 95% minimum TDA content 1.00% maximum Water content 0.10% maximum Amine value 515-535 mg KOH/g 2.2 Test Methods and Data Sources Five items carry published values and the rest are calculated. Appearance is judged visually. Water is determined by Karl Fischer titration according to ASTM E203, and the amine value is obtained by titration and reported in mg KOH/g. The molecular formula and molecular mass are not printed on the product page, so both are calculated and should be confirmed against the current certificate of analysis. Two columns in the later tables are computed rather than measured: amine hydrogen equivalent weight, and the hardener demand that follows. 3. Results and Discussion Reaction with isocyanate is slow for DMTDA, and the reason sits in two methylthio groups. 3.1 Structure and Reactivity of DMTDA Each molecule carries two primary amine groups on a toluene ring, with one methylthio group (–S–CH3) beside each nitrogen. Those sulfur groups are bulky and electron-donating, so the nitrogen lone pair is shielded and the rate of attack on an isocyanate falls. Ring rigidity then raises hardness, modulus and heat resistance in the cured network. The product page states the consequence: the reaction rate with isocyanate is lower than that of DETDA. A slow reaction is not a defect everywhere. In a large casting it extends the pour window; in a small, fast-demould part it costs productivity. The published amine value of 515-535 mg KOH/g is consistent with the calculated mass of 214.3 g/mol. 3.2 Comparison with Alternative Amine Systems Several amine families compete for the same work, and in practice the choice turns on physical state, equivalent weight and reaction rate rather than price per kilogram. DETDA is the closest relative: same diaminotoluene core, also a liquid, and the same polyurea and cast elastomer applications. Its published amine value of 625-640 mg KOH/g is higher, so it carries more amine groups per kilogram and a lower equivalent weight. Less mass is needed per equivalent and the reaction runs faster; DMTDA runs longer, so the two are often blended to set gel time. Alicyclic amines sit at the fast end. 1,2-diaminocyclohexane DACH carries a published AHEW of 28.5 g/eq, roughly double the amine density of DMTDA. m-xylylenediamine MXDA and 1,3-cyclohexanebis(methylamine) are aromatic in character but aliphatic in behaviour. Table 3. DMTDA against alternative amine hardeners, at published and calculated values. Property DMTDA DETDA DACH MXDA 1,3-BAC CAS No. 106264-79-3 68479-98-1 694-83-7 1477-55-0 2579-20-6 Amine value, mg KOH/g 515-535 625-640 900 minimum not published not published Water content, maximum 0.10% 0.10% 0.30% 0.50% 0.30% AHEW, g/eq 53.6 calculated 44.6 calculated 28.5 published 34.1 calculated 35.6 calculated Hardener for EEW 187, phr 28.7 23.8 15.2 18.2 19.0 Read the last row as a cost line. For 100 g of resin, DMTDA needs 28.7 phr, DETDA 23.8 phr and DACH only 15.2 phr, so price per kilogram says little about mix cost. 4. Formulation and Dosage Calculation Hardener demand in an epoxy system comes from one relation: phr = 100 × AHEW ÷ EEW. Four active hydrogens on a molecular mass of 214.3 g/mol give DMTDA an AHEW of 214.3 ÷ 4 = 53.6 g/eq. Table 4. Theoretical DMTDA demand for common liquid epoxy resins. Epoxy resin, published EEW EEW, g/eq DMTDA, phr DETDA, phr Liquid bisphenol A resin YLE-127 176-184 30.5-29.1 25.3-24.2 Liquid bisphenol A resin YLE-128 184-190 29.1-28.2 24.2-23.5 Liquid bisphenol A resin YLE-121 170-176 31.5-30.5 26.2-25.3 Phenolic epoxy resin YLEP-638 170-190 31.5-28.2 26.2-23.5 The resin EEW values come from the liquid bisphenol A epoxy resin grades and the YLEP-638 multifunctional epoxy resin page. Recalculate from the batch EEW. Chain extension is counted differently. The equivalent weight against isocyanate is taken per amine group, so it is 214.3 ÷ 2 = 107 g/eq, calculated. Table 5. Worked chain-extender demand for a cast polyurethane formulation. Parameter Value Prepolymer NCO content 8.0% Isocyanate equivalent weight 525 g/eq NCO equivalents in 100 g prepolymer 0.190 Curative equivalent weight, calculated 107 g/eq Curative at 100% index 20.4 g Index is the lever. A 95% index leaves unreacted isocyanate and a softer part; above 100% the isocyanate is consumed, but unreacted amine can plasticise the elastomer. The right index depends on the hardness target, so verify it on a trial casting. Blending is the second lever. Because DMTDA can be used together with DETDA, the ratio sets both working time and hardness. Start from the equivalent-weight average, then adjust on a gel-time trial. 5. Processing Notes and Operating Window Ambient-temperature liquid means DMTDA can be pumped and metered without a melt tank. Handling rules follow. • Keep the drum closed between uses. Amines take up moisture and carbon dioxide from air, and an open drum drifts past the 0.10% water limit. • Do not heat the drum unless the shop is cold. There is no melting step to justify it, and heat accelerates oxidation. • Watch the blend, not just the two components. If DETDA is added for speed, gel time falls faster than the equivalent-weight average predicts. • Wear nitrile gloves, goggles and a coverall. Aromatic diamines are skin sensitisers, and the safety data sheet carries the PPE list. Figure 2. Metering DMTDA into a polyurethane prepolymer before casting. 6. Applications The product page names three directions: a chain extender and curing agent for polyurethane and polyurea systems, an epoxy curing agent, and an industrial lubricant. Table 6. Application areas for DMTDA and the formulation note for each. Application Role Formulation note Cast polyurethane elastomers chain extender room-temperature or hot casting with an MDI prepolymer Polyurea spraying systems chain extender the slower reaction widens the spray window Other polyurethane products chain extender often blended with DETDA to set demould time Epoxy casting and coatings curing agent requires heat; dosage from the AHEW relation Industrial lubricants functional additive listed on the product page, with no dosage given Figure 3. Polyurea floor coating applied over concrete, a typical end use for DMTDA chain extension. 7. Limitations and Material Verification Three situations call for an amine other than DMTDA. 7.1 Known Limitations and Unsuitable Uses Room-temperature epoxy cure is the first limit. An aromatic amine needs heat for full conversion, so a casting left at 20 °C stays soft in the core. Without an oven cycle or an accelerator, an alicyclic amine such as DACH is the better starting point. Colour is the second, and it matters when the finish is white or light grey. Aromatic amines oxidise in air, so a non-yellowing coating is the wrong place for DMTDA. The third is dosage mass. The high equivalent weight means more hardener mass per kilogram of resin than DETDA or DACH needs. That is a freight cost, not a performance penalty, so quote it per equivalent. 7.2 Incoming Inspection, Packaging, Storage and Safety Four checks catch most incoming-lot problems: appearance against the light yellow reference, water by Karl Fischer titration according to ASTM E203, amine value by titration, and diamine content by the certificate of analysis (COA) method. Run the water check in duplicate on the first drum of each delivery. Drum packaging is standard. Store in a well-ventilated area away from flames and direct sunlight, keep the cap closed after use, and expect a shelf life of at least 12 months from manufacture in the original packing. Safety data sit in the material safety data sheet. Treat the liquid as an irritant and a skin sensitiser, and read the sheet before the first drum is opened. 8. Frequently Asked Questions What is the equivalent weight of DMTDA? For epoxy formulation the amine hydrogen equivalent weight is 53.6 g/eq, calculated as 214.3 g/mol divided by four active hydrogens. For isocyanate chain extension it is taken per amine group and equals 107 g/eq. Confirm both against the current certificate of analysis. How much DMTDA does 100 g of epoxy resin need? For a liquid bisphenol A resin of EEW 187 the theoretical dosage is 100 × 53.6 ÷ 187 = 28.7 phr. The figure moves with the resin: EEW 173 gives 31.0 phr and EEW 250 gives 21.4 phr. Does DMTDA react faster or slower than DETDA with isocyanate? Slower. The product page states that the reaction rate with isocyanate is lower than that of DETDA, which is why DMTDA is described as a slower chain extender. A blend of the two lets a formulator set demould time without changing the stoichiometry. Can DMTDA be processed at room temperature? Handling and metering need no heat, because DMTDA is a liquid at ambient temperature and room-temperature casting of polyurethane elastomers is an established use. Room-temperature epoxy cure is different: an aromatic amine needs heat for full conversion. What is the shelf life and how should DMTDA be stored? At least 12 months from the date of manufacture in the original packing at ambient temperature, according to the product page. Keep the drum closed, in a well-ventilated area away from flames and direct sunlight. A part-used drum left open can fail the 0.10% water limit. Can DMTDA replace a solid aromatic diamine curative? In many cast polyurethane and polyurea systems it can, because a liquid curative removes the melt and hold-temperature steps a solid one requires. It is not a drop-in replacement everywhere: the equivalent weight is higher, so the dosage changes, and the cured colour is darker. 9. Conclusions DMTDA is a liquid aromatic diamine whose published specification covers appearance, diamine content, TDA content, water and amine value, with a calculated amine hydrogen equivalent weight of 53.6 g/eq. Its place in a formulation rests on a pumpable liquid at room temperature, an isocyanate reaction slower than that of DETDA, and the stiffness the aromatic ring gives the cured network. Dosage follows two relations. For epoxy, phr = 100 × AHEW ÷ EEW gives 28.7 phr against a resin of EEW 187. For chain extension, the equivalent weight of 107 g/eq per amine group gives 20.4 g per 100 g of an 8% NCO prepolymer at a 100% index. 10. References 1. Yolatech product page: https://www.yolatech.com/dimethyl-thio-toluene-diamine-dmtda-cas-106264-79-3 (accessed 2026-10-10). 2. Yolatech Technical Data Sheet, Material Safety Data Sheet and Certificate of Analysis for DMTDA, CAS 106264-79-3 (available on request). 3. ASTM E203, water content by Karl Fischer titration. 4. ASTM D1652, epoxy content of epoxy resins (EEW). 5. ISO 3001, determination of epoxy equivalent. 6. ISO 9702, amine group nitrogen content of amine epoxide hardeners.

DMAPA curing agent is a colourless primary amine, N,N-Dimethyl-1,3-propanediamine (CAS 109-55-7), that also carries a tertiary nitrogen. Its theoretical AHEW is 51.1 g/eq, so a liquid bisphenol A resin of EEW 190 needs about 27 phr, and this stoichiometry is where most dosage errors begin at mixing. Figure 1. DMAPA as supplied: a water-clear, mobile liquid. Product Code: DMAPA Chemical Name: N,N-Dimethyl-1,3-propanediamine CAS No.: 109-55-7 Product Category: Amine curing agent / functional chemical 1. Introduction Ambient-cure epoxy systems need an amine hardener fast enough for hand-applied coatings yet slow enough to be mixed in a pail, and DMAPA (CAS 109-55-7) sits at the fast end of that range. The data reported here come from the public product page for N,N-Dimethyl-1,3-propanediamine and its published specification. Values the page omits are labelled literature or theoretical. 2. Materials and Methods: DMAPA Curing Agent Grade Data DMAPA is supplied as a colorless liquid in drum packages with a published purity of min. 99.5% and a water limit of max. 0.30%. Only four items are published, so the data below separate published values from structural inference. 2.1 Product Identification and Specification Table 1 lists the identification data used throughout this paper. Table 2 gives the four published specification items; nothing outside it is a quality claim. Table 1. Identification data of DMAPA (CAS 109-55-7). Item Information Product Code DMAPA Chemical Name N,N-Dimethyl-1,3-propanediamine CAS No. 109-55-7 Molecular Formula C5H14N2 (literature) Molecular Weight 102.18 g/mol (literature) Active Hydrogens 2, primary amine only Table 2. Published specification of DMAPA. Item Specification Appearance Colorless liquid Color, APHA Max. 20 Purity Min. 99.5% Water Max. 0.30% 2.2 Test Methods and Data Sources Values marked published come directly from the DMAPA product page. Boiling point, flash point, density and viscosity appear in Table 3 as literature values for CAS 109-55-7 rather than specification limits. Water content is determined by Karl Fischer titration and color is measured according to the APHA scale. Table 3. Physicochemical properties of DMAPA; literature and theoretical values for CAS 109-55-7. Property Typical value Basis Boiling point 132-140 °C at 1013 hPa Literature Flash point About 32 °C, closed cup Literature; ISO 3679 Density About 0.82 g/cm³ at 20 °C Literature Viscosity About 1.2-1.6 mPa·s at 20 °C Literature; ASTM D445 Amine value Not published; about 1098 mg KOH/g theoretical Theoretical; ISO 9702 AHEW 51.1 g/eq theoretical 102.18 ÷ 2 3. Results and Discussion: DMAPA Curing Agent Reactivity DMAPA carries a primary amine and a tertiary amine on one three-carbon chain, and the two nitrogens do different jobs in an epoxy cure. 3.1 Structural Basis of Reactivity The primary amine carries the two active hydrogens, so it alone sets the stoichiometry: 102.18 g/mol divided by two gives a theoretical AHEW of 51.1 g/eq. The tertiary nitrogen has no N-H hydrogen, so it contributes no crosslink and only catalyses the epoxy-hydroxyl reaction, shortening gel time. A short chain with two reactive nitrogens gives a fast, tightly crosslinked and hydrophilic network, so a slow, low-blush room-temperature system is not a realistic target for neat DMAPA. 3.2 Comparison with Alternative Curing Systems Table 4 compares DMAPA with the amine hardeners most often quoted against it, using published figures where a product page states them. Table 4. DMAPA against common amine curing agents, at published or theoretical values. Property DMAPA Common alternatives Active hydrogens / AHEW 2; 51.1 g/eq theoretical DETA 20.6 g/eq; MACM 60 g/eq; YLH-3101 110 g/eq, published Viscosity, published Not published; about 1-2 mPa·s at 20 °C MACM 80-120 mPa·s; YLH-3101 300-1000 cps at 25 °C Water miscibility Miscible MACM insoluble; MXDA soluble; polyetheramine D-230 slightly soluble Blush tendency in humid cure High Lower for water-insoluble amines such as MACM Typical role Co-hardener, accelerator, amidoamine building block DETA, MXDA primary hardeners; MACM high-performance; YLH-3101 modified ready-to-use Color stability of stock Darkens in air once opened DACH also yellows in air; modified grades hold color better For a neat room-temperature coating, DMAPA alone is rarely the right answer. The defensible placement is three roles: an amidoamine building block condensed with fatty or dimer acids, a reactivity booster alongside slower polyetheramines, and a small-dose accelerator where DMP-30 is not wanted. Rigid diamines are another route. 1,3-BAC and MACM trade higher viscosity for water resistance and strength, and N4-AMINE adds a fourth reactive nitrogen for higher crosslink density. If toughness matters more than speed, a polyamide such as YLH-5101 usually out-cures DMAPA on film properties. 4. Formulation and Dosage Calculation Dosage follows the standard amine rule, phr = 100 × AHEW ÷ EEW, which for DMAPA reduces to 100 × 51.1 ÷ EEW because only the two hydrogens on the primary amine count. Table 5. Theoretical DMAPA dosage against published resin EEW values. Resin grade (published EEW) EEW, g/eq Theoretical DMAPA, phr Liquid bisphenol A epoxy resin YLE-128 184-190 26.9-27.8 Liquid bisphenol A epoxy resin YLE-127 176-184 27.8-29.0 Bisphenol F epoxy resin YLE-170 165-175 29.2-31.0 Low-viscosity bisphenol A epoxy resin YLE-121 170-176 29.0-30.1 The error worth guarding against sits in the other nitrogen. If the tertiary amine is counted as active, the same calculation returns 34.1 g/eq and about 18 phr, and the batch gels on top while the underlayer stays soft. Whenever a mix cures unevenly, that arithmetic is the first thing to re-check. A cross-check comes from the same hardener range. YLH-6004 lists AHEW 96 g/eq at 50 phr, and YLH-3101 lists 110 g/eq at 55-60 phr, both against a resin of EEW 190. Treat every value above as a starting point. The working ratio depends on filler loading, resin purity and ambient temperature, and in practice it is confirmed by a gel-time check and a thin-film cure test on about 100 g. 5. Processing Notes and Operating Window Exotherm is the first variable to control: a loading near 27 phr against an EEW 190 resin releases a large amount of heat in a small mass, and the temperature spike shortens working time further. • Keep trial mixes at about 100 g in wide containers; the same mix in a 1 kg pail can gel in a fraction of the time. • Mix cool and post-cure warm. If the film blushes, raise the cure temperature rather than adding more amine. • Watch humidity. Blush forms fastest in cold, damp shops, so schedule amine-cured work away from the wettest part of the day. • Ventilate locally. Keep the drum closed and draw through a pump instead of pouring from an open bung. • Wear nitrile gloves, splash goggles and protective clothing; DMAPA is corrosive and a skin sensitiser, and the MSDS carries the PPE list. • Verify water content on opened drums. Moisture above the 0.30% limit shows up as haze long before a routine COA catches it. Figure 2. Decanting DMAPA under local exhaust ventilation. 6. Applications The product page lists six application directions for DMAPA: cosmetic raw materials, dyestuffs, ion exchange resins, epoxy resin curing agent, non-cyanide electroplating additive, and fibre and leather treatment agent. Table 6 separates the epoxy role from the intermediate roles. Table 6. Application areas for DMAPA and its role in each. Application area Role of DMAPA Practical note Epoxy resin curing Reactive hardener and accelerator About 27 phr against EEW 190 resin; watch blush and exotherm Amidoamine hardeners Amine building block Condensed with fatty or dimer acids Ion exchange resins Amine functionalisation intermediate Amine source for polymer backbones Cosmetic raw materials Intermediate for betaine surfactants An industrial intermediate, not a cosmetic ingredient as supplied Dyestuffs Synthesis intermediate Dye intermediate manufacture Electroplating additive Non-cyanide bath additive Bath formulation is the customer's scope Fibre and leather treatment Treatment agent component Formulated into baths, not applied neat Neat casting in thick sections, food-contact claims, and any specification requiring a published amine value or gel time sit outside what this grade supports on paper. Figure 3. Amine-cured epoxy coating on the internal wall of a steel tank. 7. Limitations and Material Verification Two areas limit how DMAPA can be specified: the published data set itself, and the behaviour of the material in humid air or thick sections. 7.1 Known Limitations The specification covers appearance, color, purity and water only. No gel time, equivalent weight or official amine value is published, so any dosage plan stays theoretical until a batch COA confirms it. Blush is a property rather than a defect, and thick-section casting sits outside the grade because the exotherm of a neat amine in a large mass is hard to control. 7.2 Incoming Material Verification, Packaging and Safety Drum-to-drum variation exists on any amine line, so incoming checks on water content and color are recommended for every lot. Water content is determined by Karl Fischer titration and color is measured according to the APHA scale. DMAPA ships as a drum package with a published shelf life of at least 12 months in unopened packing at ambient temperature. Store in a well-ventilated area away from flames and direct sunlight, and close the cap tightly after each draw. The material is flammable, corrosive and a skin sensitiser; the hazard information is in the Material Safety Data Sheet. 8. Frequently Asked Questions How much DMAPA curing agent is needed per 100 parts of epoxy resin? Divide 5,110 by the resin EEW. The theoretical AHEW of 51.1 g/eq gives about 26.9 phr at EEW 190 and about 31.0 phr at EEW 165. Filler and temperature shift the ratio, so verify by gel time first. Why does the surface of a DMAPA-cured epoxy turn white or stay tacky? Two mechanisms produce that look. A white carbamate film is the amine reacting with CO2 in humid air; a tacky underlayer means under-stoichiometry from counting the tertiary nitrogen as an active hydrogen. Cure warmer and drier, and recalculate at 51.1 g/eq. Can DMAPA replace a modified amine hardener such as YLH-3101 in a floor coating? No, not as a one-for-one swap. YLH-3101 is a modified alicyclic hardener with a published AHEW of 110 g/eq, 55-60 phr loading and a 40-70 min gel time, and its modification exists to control blush. Neat DMAPA cures faster but blushes more. Does the tertiary amine in DMAPA count as an active hydrogen? It does not. The tertiary nitrogen has no N-H hydrogen, so it contributes catalysis but not stoichiometry, and the equivalent weight stays at 102.18 ÷ 2 = 51.1 g/eq. Counting three nitrogens returns 34.1 g/eq and roughly 18 phr, which under-cures the batch. How long can DMAPA be stored, and what does the packing look like? The published shelf life is at least 12 months in the original packing at ambient temperature, supplied as a drum package. No net drum weight is published, so confirm the packing list at order. Opened drums are closed tightly after each draw. Why does DMAPA darken or smoke when a drum is left open? The product page describes the material as flammable and corrosive, one that will smoke and blacken in air. Low-molecular-weight amines absorb water and CO2 quickly, and the reaction shows up as darkening. Keep the cap tight. 9. Conclusions This diamine (CAS 109-55-7) is fast, low-viscosity and water-miscible, and its theoretical AHEW of 51.1 g/eq gives about 27 phr against an EEW 190 resin. Its practical roles are an amidoamine building block, a reactivity booster and a small-dose accelerator. Its limits are humid-cure blush, exotherm in thick sections, and no published gel-time or amine-value data. Values quoted here are published data or figures labelled theoretical and literature; where the product page is silent, the current TDS / MSDS / COA governs. Grade availability for N,N-Dimethyl-1,3-propanediamine DMAPA is confirmed against a target EEW. 10. References • Yolatech product page, N,N-Dimethyl-1,3-propanediamine DMAPA: https://www.yolatech.com/nn-dimethyl-13-propanediamine-dmapa-cas-109-55-7 (accessed 2026-10-09). • Yolatech Technical Data Sheet, Material Safety Data Sheet and Certificate of Analysis for DMAPA, CAS 109-55-7 (available on request). • ASTM D1652, epoxy content of epoxy resins (EEW). • ISO 3001, determination of epoxy equivalent. • ISO 9702, amine group nitrogen content of amine epoxide hardeners. • ASTM E203, water content by Karl Fischer titration. • ASTM D1544, Gardner color of transparent liquids.

Product Code: DMP-30 / Tris-DMPCAS No.: 90-72-2Product Category: Epoxy Curing Accelerator / Co-curing Agent   1. Product Information Item Information Chemical Name 2,4,6-Tris[(dimethylamino)methyl]phenol Common Name 2,4,6-Tris(dimethylaminomethyl)phenol Product Code / Trade Name DMP-30 / Tris-DMP CAS No. 90-72-2 EC No. 202-013-9 Molecular Formula C15H27N3O Molecular Weight 265.39 g/mol Linear Formula [(CH3)2NCH2]3C6H2OH Category Tertiary amine phenolic epoxy curing accelerator / Mannich base   2. Product Description DMP-30 is a Mannich base type epoxy curing accelerator containing tertiary amine groups and a phenolic hydroxyl group. In epoxy resin systems, its tertiary amine structure acts as a Lewis base catalyst and promotes curing reactions, while the phenolic hydroxyl group contributes to activation in epoxy formulations. It is commonly used as an epoxy curing accelerator, catalyst, or co-curing agent in systems requiring faster room-temperature curing, improved early strength development, or better processing efficiency.   3. Structural Features and Key Advantages 3.1 Structural Features The DMP-30 molecule contains three dimethylaminomethyl groups and one phenolic hydroxyl group. This structure provides high catalytic activity in epoxy resin systems and allows DMP-30 to work with various epoxy resins and curing agent systems. 3.2 Key Advantages • Effective cure acceleration: accelerates curing reactions in epoxy systems and supports room-temperature or medium/low-temperature curing. • Good formulation adaptability: can be used with amine, polyamide, anhydride and other epoxy curing systems. • Low dosage as accelerator: normally used at relatively low addition levels in epoxy formulations. • Improved processing efficiency: helps shorten tack-free and curing time and improve production or application turnover. • Wide application range: suitable for adhesives, coatings, potting, casting, composites and concrete repair epoxy systems.   4. Typical Technical Information The following data are typical values collected from publicly available sources for internal product database reference only. Official sales, quotation or technical commitment should be based on company TDS, MSDS, COA or mutually confirmed documents. Item Typical Information Appearance Light yellow to yellow liquid / amber to red-brown liquid (description may vary by supplier) Odor Amine odor Molecular Formula C15H27N3O Molecular Weight 265.39 g/mol Boiling Point Approx. 316°C (public supplier data) Viscosity Approx. 200 cps (public supplier data; not company specification) Refractive Index n20/D 1.515 (public supplier data) Transport Information Amines, liquid, corrosive, n.o.s.; Class 8; Packing Group III (refer to actual MSDS)   5. Applications Application Field Function / Description Epoxy Curing Accelerator Accelerates epoxy curing reactions and improves curing speed at room temperature or medium/low temperature. Adhesives and Sealants Used in industrial adhesive systems requiring faster cure response and strength development. Coatings and Protective Systems Used in epoxy coatings, floor coatings and anti-corrosion coating formulations to improve cure speed. Potting and Casting Systems Used in electronic potting, casting resin and industrial casting formulations to adjust curing reaction. Composites and Construction Materials Can be used in epoxy composites, concrete repair and structural bonding applications.   6. Packaging, Storage and Safety Packaging: usually available in drums or other industrial packaging according to supplier specifications. Actual packaging should follow company delivery arrangement. Storage: keep tightly sealed in a cool, dry and well-ventilated place. Avoid heat, direct sunlight and moisture ingress. Keep away from strong oxidizing agents, strong acids and incompatible materials. Safety: the product may present corrosive and irritant hazards. Wear protective gloves, safety goggles and protective clothing during handling. Refer to the MSDS for detailed safety information.

Product: 1,3-Cyclohexanebis(methylamine)CAS No.: 2579-20-6Code: 1,3-BAC / HXDA   1. Product Information Item Information Product Name 1,3-Cyclohexanebis(methylamine) CAS No. 2579-20-6 Formula C8H18N2 Molecular Weight 142.24 g/mol Category Alicyclic Diamine Compound   2. Product Description 1,3-BAC is an important alicyclic diamine compound containing two primary amino groups. It provides excellent reactivity, low viscosity and good processing performance. Due to its non-aromatic molecular structure, it improves weather resistance, anti-yellowing performance and long-term stability of polymer materials.   3. Key Advantages · Low viscosity and excellent processability · Fast curing performance · Excellent anti-yellowing and weather resistance · Good chemical resistance and durability · Suitable for high-performance polymer applications   4. Technical Data Item Information Appearance Colorless transparent liquid Purity ≥99.0% Viscosity 9.1 mPa·s at 20℃ Density 0.940-0.950 g/cm³ at 25℃ Freezing Point < -70℃ Boiling Point Approx. 220℃ Flash Point Approx. 113℃   5. Applications Epoxy Resin Curing Agent: coatings, adhesives, electronic encapsulation and composite materials.Polyurethane Industry: raw material for alicyclic isocyanates and advanced polyurethane systems.Specialty Polymers: used in development of high-performance cycloaliphatic polymers.   6. Packaging, Storage & Safety Packaging: 190kg iron drum.Storage: Keep sealed in a cool and dry place. Avoid heat, sunlight, acids and oxidizing agents.Safety: Corrosive chemical. Use appropriate protective equipment and refer to MSDS.

Product information 1.3-BAC is a diamine substance, it is colourless transparent and low viscosity liquid at room temperature, it has obvious ammonia smell, corrosive and combustible when it meets open fire. It belongs to cyclic aliphatic amine, when used as epoxy curing agent, it has both the high activity of aliphatic amine and the excellent mechanical properties, temperature resistance and yellowing resistance of alicyclic amine, it is often used in the preparation of high-quality epoxy adhesive products.   Application Mainly used as epoxy curing agent or preparation of modified epoxy curing agent, not only low viscosity, good operability, and excellent room temperature curing performance, its products in the mechanical properties, temperature resistance, water resistance, chemical resistance and other aspects of the excellent preparation of high-quality epoxy adhesives, flooring paints, etc., are widely used in high-end flooring, jewelry adhesive, crystal adhesive, stone adhesive industry; at the same time, due to its excellent mechanical properties, good operability, also used in composite materials. At the same time, due to its excellent mechanical properties and good operability, it is also used in composite material industry (automobile, wind blade, etc.).   Ratio Epoxy resin 128 (epoxy equivalent 190):100 Amount of curing agent: 17~20   Nanjing Yolatech provides all kinds of high purity and low chlorine epoxy resins, including Bisphenol A epoxy resin, Bisphenol F epoxy resin, Phenolic epoxy resin, Brominated epoxy resin, DOPO modified phenolic epoxy resin, MDI modified epoxy resin, DCPD epoxy resin, Multifunctional epoxy resin, Crystalline epoxy resin, HBPA epoxy resin and so on. And we also could provide all kinds of curing agents or hardeners and diluents.   We will be at your service 24 hours a day. Pls contact us freely.  

  Dicyandiamide curing agent belongs to the heating curing class of latent curing agent, solid at room temperature, insoluble in epoxy resin, dispersed in epoxy resin in the form of microparticles, through the heating reaction, once heated to the melting point of the vicinity of the start of the dissolution and rapid reaction curing.   Curing reaction of dicyandiamide The molecular structure of dicyandiamide contains a cyano group (-CN) in addition to four active hydrogens. Cyano group can also participate in the curing reaction as a functional group. The curing reaction temperature of dicyandiamide is generally in the range of 160~180°C, and the curing reaction time is 20~60 minutes. For bisphenol A epoxy resin with 190 epoxy equivalents, the theoretical dosage of dicyandiamide curing agent (calculated on the basis of active hydrogen equivalents) is 11.1 parts, but the actual dosage is often in the range of 4-10 parts (based on 100 parts of the resin by mass). Dicyandiamide micropowder is dispersed into the epoxy resin, has a suitable storage period, is stable in storage, does not delaminate, and does not cure.   The fineness of the dicyandiamide particles may vary from product to product. The finer the dicyandiamide particles, the more obvious the performance advantage for curing reaction Ultra-fine dicyandiamide particles are easier to be evenly dispersed into the epoxy resin liquid. Ultra-fine dicyandiamide particles can be better mixed and dissolved in the epoxy resin liquid than ordinary dicyandiamide.   Application areas of dicyandiamide curing compounds Dicyandiamide epoxy resin has good adhesive property, heat resistance and stable storage period. Dicyandiamide epoxy resins can be widely used in powder coatings, carbon fibre prepregs, heat curable inks, laminates, single component adhesives and other applications. Typical applications: Preparation of prepregs for the manufacture of reinforced composites (wind energy, automotive, aerospace, marine engineering and other industries). Electronic packaging materials, adhesives. Powder coatings (especially heavy duty anti-corrosion function). For epoxy-based adhesives (reinforced materials).   Nanjing Yolatech provides all kinds of high purity and low chlorine epoxy resins, including Bisphenol A epoxy resin, Bisphenol F epoxy resin, Phenolic epoxy resin, Brominated epoxy resin, DOPO modified phenolic epoxy resin, MDI modified epoxy resin, DCPD epoxy resin, Multifunctional epoxy resin, Crystalline epoxy resin, HBPA epoxy resin and so on. And we also could provide all kinds of curing agents or hardeners and diluents.   We will be at your service 24 hours a day. Pls contact us freely.    

Epoxy resin adhesive is a reprocessing or modification of epoxy resin to make its performance parameters meet specific requirements. Usually epoxy resin adhesives are also used with curing agents and need to be mixed well to be fully cured. Generally, the epoxy resin adhesive is called A adhesive or main agent, and the curing agent is called B adhesive or curing agent(hardener).   Main properties of epoxy resin adhesives before curing Colur, viscosity, specific gravity, proportioning, gel time, open time, curing time, thixotropy (flow stopping), hardness, surface tension, etc.   Main properties of epoxy resin adhesive after curing Resistivity, proof voltage, water absorption, compressive strength, tensile strength, shear strength, peel strength, impact strength, heat deflection temperature under load, glass transition temperature, internal stress, chemical resistance, elongation, shrinkage coefficient, thermal conductivity, electrical conductivity, weathering resistance, aging resistance, dielectric constant.   Curing characteristics of epoxy resin adhesive Most of the epoxy resin adhesives are heat-setting adhesives. The higher the temperature of the epoxy resin adhesive, the faster the curing. The more the amount mixed at one time, the faster the curing. The curing process has exothermic phenomenon, etc.   Nanjing Yolatech provides all kinds of high purity and low chlorine epoxy resins, including Bisphenol A epoxy resin, Bisphenol F epoxy resin, Phenolic epoxy resin, Brominated epoxy resin, DOPO modified phenolic epoxy resin, MDI modified epoxy resin, DCPD epoxy resin, Multifunctional epoxy resin, Crystalline epoxy resin, HBPA epoxy resin and so on. And we also could provide all kinds of curing agents or hardeners and diluents. We will be at your service 24 hours a day. Pls contact us freely.  

  Epoxy resins are commonly used as a matrix for materials such as adhesives, coatings and composites, and are widely used in construction, machinery, electrical and electronic, aerospace and other fields. A complete concept of epoxy resin constituents by four aspects of the composition. However, in practice, it is not necessary to have all four aspects of the components, but the resin composition must include the curing agent, which shows the importance of the curing agent. Epoxy resin components Epoxy resin Epoxy resin Main part，bisphenol A type and other types of epoxy resins Curing agent Reacts with epoxy resins to form three-dimensional network polymers Components for modification Plasticiser Gives epoxy components plasticity, but reduces its heat and chemical resistance Toughening agent Improved impact resistance without compromising other properties Filler Increase weight, improve curability, mechanical properties, such as calcium carbonate, mica, etc Flame retardant agent To make the epoxy Components with flame resistance, there are filler flame retardant and reactive flame retardant Components used to regulate fluidity Diluent Reduce components viscosity, including active and inactive diluents Thixotropic agent Imparts thixotropic properties to epoxy compositions, e.g. asbestos, silica micropowder Other components Pigments, solvents, defoamers, levelling agents, tackifiers, etc. The reason why epoxy resins are widely used is the result of the versatile co-ordination of these components. Especially the curing agent, once the epoxy resin is determined, the curing agent plays a decisive role in the processability of the epoxy resin composition and the final performance of the cured product. Classification of epoxy curing agents 1. Classification by acid-base properties Type Curing agent name acidity Organic anhydrides, boron trifluoride and its complexes alkali Aliphatic diamines, polyamines, aromatic polyamines, dicyanodiamines imidazoles, modified amines   2. Classification by reactivity and chemical structure Curing agent Apparent curing agent Addition reaction Polyamine Simple amine Straight chain fatty amine DETA，TETA，DEPA，TEPA Polyamides Polyamides with different amine values Aliphatic amine MDA，IPDA Aromatic amine m-XDA, DDM, m-PDA, DDA Modified amine Anhydride Monofunctional group PA, THPA, HHPA, MeTHPA, MeHHPA, MNA, DDSA, HET Bifunctional group PMDA, BTDA, TMEG, MCTC Carboxyl group TMA, PAPA Polyphenol PN Polythiol PM, PS Catalyst reaction Anionic polymers DMP-30, 2E4MZ Cationic Polymers BF3∙MEA Latent curing agent Dicyandiamide Organic acid hydrazide Ketimine microcapsules   3. Classification by curing temperature Curing Temp. Curing agent type Curing agent name 0-20°C Low temperature curing agent Polythiols, aliphatic polyamines or promoters, aromatic polyamines or promoters 20-40°C Normal temperature curing agent Polyamide, tertiary amine 60-100°C Medium temperature curing agent Dibasic aminopropylamine, imidazole, tertiary amine salts, aliphatic amines 100-150°C Medium and high temperature curing agent Anhydride or promoter, BF3-ammonium salt, dicyandiamide/promoter, imidazole derivatives, hydrazides 150°C+ High temperature curing agent Aromatic polyamines, polyphenols, acid anhydrides   4. Classification by different usage Curing agent Curing at room temperature Heavy Duty Anti-corrosion Coatings Adhesives for civil engineering and construction Civil Engineering Coatings FRP General Adhesives Alicyclic polyamines Denatured polyamines Straight chain aliphatic polyamines Polyamides, polythiols Heat curing Electrically insulating material Acid anhydride, imidazoles, BF3 complexes Laminated materials Dicyandiamide, aromatic polyamines, linear phenolic resins Coatings   Tank materials Amino resins, methyl phenolic resins Powder material Dicyandiamide, aromatic polyamines, acid anhydrides Moulded material Linear phenolic resins Adhesives Aromatic polyamines, anhydrides, imidazoles, BF3 amine complexes     Structure and properties of curing agents A comprehensive understanding of the properties and characteristics of polyamine curing agents with the same functional group but different chemical structures is very important for the selection of curing agents. The main characteristics (color, ripeness, duration of use, etc.) also show a certain regularity. Color: (good) alicyclic->aliphatic->amide->aromatic amine(bad) Maturity: (low) alicyclic->aliphatic->aromatic->amide(high) Application period: (Long) Aromatic->Amide->Alicyclic->Aliphatic (Short Curability: (Fast) Aliphatic->Alicyclic->Amide->Aromatic (Slow) Irritation: (Strong) Aliphatic->Aromatic->Alicyclic-Amide (Weak) Gloss: (Excellent) Aromatic->Alicyclic->Polyamide->Aliphatic amide (Poor) Flexibility: (Soft) Polyamide->Aliphatic->Alicyclic->Aromatic (Rigid) Adhesion: (Excellent) Polyamide->alicyclic->aliphatic->aromatic (Good) Acid resistance: (Excellent) Aromatic->Alicyclic->Aliphatic->Polyamide (Inferior) Water Resistance: (Excellent) Polyamide->Aliphatic Amine->Aliphatic Cyclic Amine->Aromatic Amine (Good)     Development trend of curing agent Curing agent as a core substance to play the value of epoxy resin, the nature of the cured product depends on the performance of the curing agent, so the road of research on the curing agent has far-reaching significance. From the research of curing agent to date, combined with the current situation at home and abroad, curing agent is currently facing some of the following challenges and changes. The development of high activity and excellent heat resistance curing agent. The use of modified polyether amine, aliphatic amine or mixed compound to prepare high activity and heat resistance curing system. Due to the traditional epoxy resin in the curing performance is poor, especially low toughness, brittle, greatly affecting its use, so improve the performance of epoxy resin needs to improve the toughness. Improve the curing environment, overcome the volatility and toxicity of amine curing agent, and promote the development of room temperature curing agent by modifying amine with physical or chemical method. Improve the adaptability and specialty of epoxy resin in special environments, to meet the special environments such as humid, underground low temperature environment or underwater of reservoir dam repair. Curing agent and curing technology matching, will be a variety of curing technology (heat curing, microwave curing, light curing) combined with the selection of the appropriate curing agent may be able to get a comprehensive performance of the curing product. Heating type latent curing agent has great potential, can continue to study the dicyandiamide and its modified products, organic acid hydrazide, boron - amine complex, imidazole, microcapsules and other latent curing agent.