A catalytic coating crosslinking agent

A catalytic coating crosslinking agent,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.

Epoxy resin is referring to molecule contains two or more than two epoxide group of organic compounds, in addition to the individual, their relative molecular quality is not high. The molecular structure of the epoxy resin based on molecular chain containing lively epoxy groups for its characteristics, epoxy groups can be placed at the end of the chain, or into a ring structure in the middle.

The classification of the epoxy resin has not unified, generally classified according to strength, heat resistant level and characteristics, the main varieties of 16 species of epoxy resin, including general adhesive, structural adhesive, high temperature resistant, low temperature resistant adhesive glue, water and wet surface glue, conductive adhesive, optical glue, plastic welding, epoxy resin film, plastic foam, plastic strain, soft material bonding adhesive, sealant, special glue, latent curing glue, glue to civil engineering and construction of 16.

Epoxy resin with epoxy groups and hydroxyl zhong, para hydroxy can react with isocyanate. Epoxy resin as polyols containing hydroxyl component directly join polyurethane adhesives, use this method only hydroxyl groups take part in the reaction, epoxy group failed to respond.

Because contain active epoxy group in the molecular structure, make them with multiple types of curing agent and crosslinking reaction formation of insoluble with three to the network structure of polymer. Every containing epoxy groups in the molecular structure of polymer compounds are collectively referred to as epoxy resin.

Cured epoxy resin has good physical and chemical properties, on the surface of the metal and nonmetal material has excellent bonding strength, good dielectric properties, deformation small shrinkage rate, dimension stability, high hardness, good flexibility, the alkali stability and most solvents.

Because of carboxyl pure polyester powder coating is much higher than the cost of epoxy or the cost of hybrid powder coatings, domestic choose carboxyl pure polyester powder coating users, its purpose is to outdoor applications. Of hydroxyl alkyl amide with carboxyl polyester its resistance to weathering requirement is self-evident. Graph one is HAA powder coatings, TGIC powder coating, pure epoxy powder coating resistance to hou contrast test results.




Chinese name: Diethyl toluene diamine(DETDA)

Diethyltoluenediamine packing： net weight 200KG/ galvanized iron drum (a small cabinet pallet loaded 16 tons), 1000KG/IB barrels (a small cabinet loaded 18 tons or 23 tons of ISOTANK).


HAA system with the system of TGIC weatherability can almost equal.

Through the study of special polyester HAA, using experimental method to verify the characteristics of HAA polyester. The selection of polyester is mainly summarized as the following several aspects: 1, choose low Tg and low softening point polyester, is advantageous to the powder coating flow leveling and the decrease of pinhole; 2, choose low reactivity of polyester, also helps to powder coating liquid have sufficient flow flat and exhaust time; 3, choose excellent yellowing resistance of polyester, is suitable for the application system of white powder. At the same time, weather resistance, and mechanical properties of the powder coating, luster, such as index, are largely determined by the polyester.

Select all of the crosslinking agent are low viscosity, recommended for low VOC epoxy system. Polyamide - amine adduct 1 # supply in the form of benzene methanol solution, and the other is without any solvent. All of the typical performance of crosslinking agent. In this study, 3060 referred to as cashew shell oil phenolic amides, LITE and polyamide - amine adduct called PolyA.

According to ASTM D5895-03 with 8 mil wet film thickness (WFT) determination of all four types of crosslinking agent of drying time. The crosslinking agent and liquid bisphenol A epoxy resin (EEW190) 2 minutes and no longer provide further induction time.

At room temperature and low temperature conditions, cashew nut shell oil phenolic amides and PolyA# 2 can provide faster than PolyA# 1 and PolyA# 3 reactivity, so it can improve the productivity. Although these products at a faster rate of crosslinking, they provide limited construction period.

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