Carboxyl functional groups resin coating crosslinking agent

Carboxyl functional groups resin coating crosslinking agent: different melamine urea acid three glycidyl ester/TGIC, Triglycidylisocyanurate containing carboxyl functional groups is one of the most important crosslinking agent of resin, especially in carboxylic acid polyester.

The chemical structure of TGIC is the following: its three epoxy functional groups provide plenty of activity, and the stability of the triazine ring ensures good heat resistance and weather resistance.

After more than 20 years of development, use it as the main crosslinker of outdoor weatherability powder coating system has developed quite mature, can provide variety is complete, a full range of high and low light, texture, super weather resistance and high and low temperature crosslinking varieties, such as this is unmatched by any other system.

To be sure, there has been no can completely replace the TGIC varieties before, it is still the preferred crosslinking agent. China is the largest provider of TGIC and consumers. Primid due to its main substitute product can't meet like aluminum alloy construction profiles of strict requirements, combined with the United States still use TGIC, so for quite a long time it will not withdraw from the stage.

TGIC synthesis is in ammonium halide or halogenated phosphine, in the presence of catalyst by heating in a large amount of excess epichlorohydrin cyanuric acid, then by using alkaline catalyst halogenated alcohol to take off hydrogen halide generated TGIC products, at the same time distilled from excessive epichlorohydrin, and will get the crude product of purified by recrystallization method.
TGIC epoxy equivalent theory is 99, but due to the part of the condensation and hydrolysis during storage, epoxy equivalent value on the high side, in the range of 105 to 110. Low when the epoxy value is characteristic of TGIC is quite important.

Low molecular weight materials in powder coating ingredients can reduce the glass transition temperature (Tg) of the system, the storage stability of the coating have a negative impact. The eu decision since May 1998, TGIC signed T tag must be used (with a skull and crossbones as a symbol of toxic) and attach relevant dangerous! In the words.




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


Functional groups, it is decided to organic compounds, chemical properties of atoms or groups of atoms. Common functional groups of carbon carbon double bond, carbon carbon triple bond, hydroxyl and carboxyl, ether bond, aldehyde, carbonyl, etc. Organic chemical reaction occurs mainly on the functional groups, decide on the nature of organic functional groups, -, - OH, X - CHO, - COOH, NO2 -, - SO3H, NH2, RCO, these functional groups determines the organic matter of halogenated hydrocarbon, alcohol or phenol, aldehyde and carboxylic acid, nitro compounds, or nitrous acid ester, acid, amine, organic matter the amide class chemical properties.

Functional groups decide the nature of organic matter, -, - OH, X - CHO, - COOH, NO2 -, - SO3H, NH2, RCO, these functional groups determines the organic matter of halogenated hydrocarbon, alcohol or phenol, aldehyde and carboxylic acid, nitro compounds, or nitrous acid ester, acid, amine, organic matter the amide class chemical properties.

Learn the nature of the organic matter is, in fact, the nature of the functional groups, containing organic matter what functional groups should have the chemical properties of the functional groups, does not contain the functional groups of organic matter is chemical properties do not have this kind of functional groups, this is the study of organic chemistry, especially to recognize the point.

Carboxyl group is composed of multiple hydroxyl groups, it is carboxylic acid functional group, carboxyl - COOH.

Simply put, carboxyl is composed of CHO compounds. Exactly is a hydrogen atom sharing two oxygen atoms, because C and between two oxygen atoms form large Π key, so the role of the H 2 O are equivalent.

Composed of carbonyl and hydroxyl groups, a price is called the carboxyl. The nature of the carboxyl group is not simple addition and carbonyl and hydroxyl. , for instance, carboxyl of carbonyl group under the influence of hydroxy become very not lively, not with HCN, NaHSO3, such as nucleophilic reagent addition reaction, and its hydroxyl easier than alcohol hydroxyl dissociation, shows that weak acid. In the anion of carboxylic acid salt, as a result of the electron delocalization effect, key averaging them out. So it's actually two carbon oxygen key is completely equal.

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