News Details
Paint crosslinking agent requirements
2017-9-3 17:00:28
Paint crosslinking agent requirements
Diethyltoluenediamine Raw material ：
TDA industrial, Sichuan production
Ethylene (Et) polymer grade, Shanghai production
TEA industrial imports
The paint crosslinking agent requires (1) that it is solid at normal temperature
The coating crosslinking agent requires (2) that no reaction occurs when the resin melts and mixes.
Coating crosslinking agent requirements (3) the storage stability of the coating is good, the crosslinking temperature is low, the crosslinking time is short.
Coating crosslinking agent requires (4) non-irritating odor and toxicity.
Coating crosslinking agent requirements (5) won't make the paint film color.
Paint crosslinking agent requirements (6) are cheap.
In epoxy powder coating film is epoxy resins and crosslinking agent, the two compounds at room temperature without chemical reaction, but under the condition of the powder coating baking crosslinking temperature, chemical reaction, and crosslinked couplet membrane, become has certain physical and mechanical properties, chemical resistance is also very good polymer coating.
It is well known that the reactive groups in epoxy resins are mainly epoxies (or glycidyl), and hydroxyl groups. In crosslinking agent, the crosslinking agent has many varieties.
Crosslinking agent, reactive groups vary, but is the main reactive groups can react with epoxy group in the active hydrogen (amine hydrogen nitrogen base), such as dicyandiamide, sebacate hydrazide lively base; Carboxyl groups that can react with epoxies, such as carboxyl groups in polyester resin; An anhydride base that can react with the hydroxyl group of epoxy resin, such as the anhydride base of diphthalic acid dianhydride.
Main reaction is the epoxy groups of epoxy resin with amine or acyl amino between the active hydrogen addition reaction, generate hydroxyl groups, the hydroxyl and the reaction between the hydroxyl can also generate ether bond and water, and make the generated polymers, also is the crosslinking density increased, film forming matter become good coating performance.
First with diphenyl ketone hydroxyl of the epoxy resin tetracarboxylic acid dianhydride anhydride reaction of carboxyl compound, and then the carboxylic compounds of carboxyl generated ester with epoxy groups of epoxy resin response, finally produce polymer coating.
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
The progress of epoxy powder coating. Over the past 20 years, China's epoxy powder coating has undergone a gradual improvement and improvement, with continuous improvement and growing variety, mainly in the following aspects.
(1) the smoothness and gloss of the film are continuously improved. The initial coating of epoxy powder coating has a normal appearance, with only about 70% luster. The coating is smooth and smooth, and the gloss can reach over 95%.
(2) the adhesion and mechanical strength of the film were significantly improved. In the early 1980 s, domestic epoxy powder paint coating adhesion, resistance to impact usually only 392 n. cm level, adhesion are now in the primary level, resistance to impact not only prove that up to 490 n · cm, negative impact also can achieve 490 n. cm
(3) the film is bright in color and can match the oil paint. In the early stage epoxy powder coating is white paint not white, light color paint is not showy, now this variety in white and light color and other difficult fine powder category can achieve higher level.
(4) various kinds of products derived from epoxy powder coatings develop rapidly, such as anti-corrosion type, insulation type, fine art pattern, etc.
(5) the corresponding raw materials are progressing rapidly. The epoxy resin is transferred from the original generic variety to the powder special type, and the production process has been improved greatly.
The material is 100% active material, which needs to decrease the amount of added activity level, only as additive or as hydrolysate added to the aqueous formulation. ESO CoatOSil * MP 200 silane technical representative of products used as rich metal coating and primer formula additive amount of hydrogen evolution have improved, as a water-based acrylic emulsion coating formulation of the fouling resistance have obvious improvement. These epoxy silane oligomer as emerging technology platform to solve the challenge for the industry, produce better quality products, help to save cost, even further reduce the impact on the environment.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
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