Classification of paint crosslinking agent

Classification of paint crosslinking agent

Basic class

Basic class crosslinking agent WTF: includes aliphatic diamine and polyamines, aromatic polyamines, other nitrogenous compounds and modified aliphatic amine.

Acid class

Acid crosslinking agents: organic acids, anhydride, and boron trifluoride and their complexes.

Add molding

Add forming crosslinking agent: this kind of crosslinking agent addition reaction with epoxy group forming of the crosslinked product chain segment, and step by step through polymerization reaction molecules form the couplet body structure, this kind of crosslinking agent is also called the melon type of cross-linking agent.

Type catalytic

Type catalytic crosslinker: this kind of crosslinking agent of epoxy resin happened only trigger a role, after open the epoxy group, epoxy resin catalyzed polymerization itself into a mesh structure, generate ether bond as the main structure of homopolymer.

Amine crosslinking agent

The crosslinking effect of beramine and secondary amine on epoxy resin is to open up the epoxy group by the active hydrogen on the nitrogen atom, and the crosslinking of it. Fatty polyamine, such as ethylenediamine, hexamethylenediamine, diethylene triamine, triethylene tetramine and diethylamine, can make epoxy resin crosslinking at room temperature. And low aromatic amine diverse activities, such as m-phenylene diamine, crosslink to completely at 150 ℃.

Synthetic resin crosslinking agent

The low molecular weight polyamide resin is a kind of amber viscous resin produced by the reaction of the dimer of linoleic acid dimer or tongoleic acid dimer and aliphatic polyamide, such as ethylenediamine and diethylene triamine. The resin structure of dimer and ethylenediamine is as follows:




Chinese name: Diethyl toluene diamine(DETDA)

Diethyltoluenediamine Raw material ：

TDA industrial, Sichuan production

Ethylene (Et) polymer grade, Shanghai production

TEA industrial imports

A reagent grade additives


Latent crosslinking agent

The crosslinking agent is stable under normal conditions, but when it is heated to a certain temperature, it shows its activity and crosslinked epoxy resin. Like dicyandiamide, mixed with epoxy resin, stable at normal temperature. If in 145-165 ℃, it can make the epoxy resin in 30 minutes stated. Three complex boron nitride rimantadine, room temperature is stable, at above 100 ℃ can be cross-linked epoxy resin.

Modified technology has been largely ignored and has been widely used, such as fatty amine modification. - modified by epoxy resin (especially the modification of m-phenylenediamine and interphenylenediamine); Acid modification and liquid; The modification and liquidization of dicyandiamide (China's annual demand for liquid dicyandiamide is about 1000 tons); Imidazole modified and liquid, and modified low molecular weight polycolamine.

The combination of synergies and intensive technologies are in the ascendant. The toxicity, environmental protection laws and regulations, such as cost, efficiency factors, more difficulties in the development of new structure of the crosslinking agent, through the distribution of load and improve the efficiency of the increasingly become an effective way to develop new crosslinking agent.

Solid crosslinking agent liquid technology is very promising, such as room temperature and solid acid anhydride, dicyandiamide, etc by modified to make it to a liquid at room temperature, not only can improve the operation and use of performance, but also save energy.

Bisphenol A, 828 resin as basic resin, with cashew shell oil modified amine epoxy crosslinking agent and ketone imide crosslinking agent of organic combine, with gas phase hydrocarbon petroleum resin, hydrophobic silica and silane coupling agent preparation in the splash zone construction application of wet cross-linked epoxy coating. This kind of coating has excellent anti-corrosive, mechanical properties and chemical resistance, and the effect of use in splash zone is better than the traditional anti-corrosive coating. The service life of the product is long, the economy, environmental protection benefit is obvious.


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Diethyl toluene diamine(DETDA)  http://www.yaruichem.com