Amine coating crosslinking agent

Amine coating crosslinking agent,The most important crosslinking agent varieties of epoxy resin.

But in order to meet the requirements for the preparation of powder coatings, and the amine used crosslinking agent must be stable at low temperature, high temperature crosslinking varieties. , therefore, is suitable for the amine epoxy powder coating is used as the crosslinking agent varieties is very limited, dicyandiamide, only two hydrazide class, class imidazole derivatives.

Dicyandiamide (DICY dicyandiamide,), melting point of 207 ~ 209 ℃, the crosslinking conditions generally is 200 ℃ / 30 min. DICY main drawback is that in the insoluble in epoxy resin crosslinked coating caused by uneven, due to its solubility in water and at the same time increase the crosslinked coating on the sensitivity of the water.

In order to improve the reaction performance, need to join imidazoles promoter to speed up the reaction. In order to overcome the disadvantage of dicyandiamide and evolved some replace dicyandiamide products, typical representative is adjacent - methyl benzene 2 guanidine (Ortho - tolyl - biguanide), melting point 136 ℃, adjacent cresyl compatibility with bisphenol A epoxy resin was improved. In addition, due to high degree, the crosslinking rate increased. Recommended by the crosslinking temperature of 160 ℃ / min 20-160 ℃ / 10 min.

2 hydrazine is another kind of epoxy powder coating can be used for crosslinking agent. A crosslinking speed, film flexibility is good, don't add crosslinking promoter, has good resistance to yellowing, good water resistance. Adipic acid, sebacic acid hydrazide and phthalate derivative. The most common varieties of sebacate hydrazide (Sebacic dihydrazide), melting point is 185 ~ 190 ℃. Crosslinking conditions for 15 min or 170 ℃ 180 ℃ / / 20 min. Its main disadvantage is high cost, have certain toxicity.

2 - a substituted imidazole in epoxy powder coating amount is bigger also, mainly used as a promoter. Commonly used varieties have 2 - methyl imidazole (2 - methylimidazole), 2 - propyl imidazole (propyl imidazole), 2 - isopropyl imidazole (2 - propyl imidazole), 2 - phenyl imidazole (2 - phenylimidazole), 11 alkyl imidazole (undecylimidazole) and 17 alkyl imidazole (Heptadecylimidazole).

In 2 - alkyl and benzene ring to replace the active point of the imidazole molecule (secondary amine and tertiary amine) has the space steric hindrance, thus reducing its reactivity, long chain is helpful to improve the compatibility with resin at the same time, increase the flexibility of the cross-linked product.




Chinese name: Diethyl toluene diamine(DETDA)

Physical and chemical properties: light yellow transparent liquid, slightly soluble in water, soluble in alcohols, ethers, ketones and other polar organic solvents, and polyether, polyester polyol compatibility.

Density 1.022

Viscosity (20 ℃) ??mPa·ss290±10

Pour Point ℃-9

Boiling point of310°C

Flash Point°C161.1°C


Ammonia in one or more hydrogen atoms are replaced by alkyl after product, called amines. According to the number of hydrogen atoms have been replaced in amine molecules, amine can be divided into primary amine, secondary amine and tertiary amine. For example: CH3CH2NH2 (primary amine) (CH3CH2) 2 nh (secondary amine) (CH3CH2) 3 n (tertiary amine)

Hydrogen in ammonia was replaced by the hydrocarbon compounds generated.

H of the amine can be seen as ammonia molecules are replaced by alkyl derivatives. Amines are widely exist in nature, have very important physiological activity and biological activity, such as many proteins, nucleic acids, hormones, antibiotics and alkaloids are amine complex derivatives, such as the clinical use of most of the drugs or amine derivative and amine, so master amine properties and synthesis methods is to study the complicated natural products and better safeguard the foundation of human health.

According to the number of hydrogen is replaced, which in turn can be divided into primary amine, primary amine RNH2, (secondary amine) R2NH secondary amine and tertiary amine (tertiary amine) R3N, quaternary ammonium salt (quaternary ammonium salt) R4N + X -, such as methylamine CH3NH2, aniline C6H5NH2, ethylenediamine H2NCH2CH2NH2 and diisopropylamine (CH3) 2 ch 2 nh, triethanolamine (HOCH2CH2) 3 n, tetrabutyl ammonium bromide (CH3CH2CH2CH2) 4 n + Br -.

Four hydroxyl ammonium hydroxide or ammonium salt of replacing, called quaternary amine alkali (quaternary ammonium hydroxide) or quaternary ammonium salt (quaternary ammonium salt). NH4 + ammonium R4NOH R4NX quaternary ammonium alkali quaternary ammonium salt.

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