What are the accelerators for epoxy resin powder coatings?

In epoxy resin powder coatings, the function of accelerators is to speed up the curing reaction rate, lower the curing temperature, or shorten the curing time. The following are common types of accelerators:

Amine-based accelerators
Tertiary amines: Such as triethylamine, triethanolamine, 2,4,6-tris(dimethylaminomethyl)phenol (DMP-30), etc. Triethylamine can accelerate the reaction rate between epoxy resin and acid anhydride curing agents; DMP-30 is a highly active accelerator that can be used in curing systems such as epoxy-acid anhydride and epoxy-phenolic. It can significantly reduce the curing temperature and shorten the curing time.
Imidazoles: Such as 2-methylimidazole, 2-ethyl-4-methylimidazole, etc. These accelerators have high activity and are used in small amounts, and they have good accelerating effects on curing systems such as epoxy-dicyandiamide and epoxy-acid anhydride. For example, in the epoxy-dicyandiamide system, 2-methylimidazole can make the curing reaction proceed rapidly at a relatively low temperature.

Organometallic compounds
Organotin compounds: For example, dibutyltin dilaurate, stannous octoate, etc. Dibutyltin dilaurate is commonly used in epoxy-polyester powder coatings. It can promote the reaction between the carboxyl groups in the polyester resin and the epoxy groups in the epoxy resin, accelerate the curing process, and improve the cross-linking density and performance of the coating.
Organozinc compounds: Such as zinc naphthenate, zinc octoate, etc. They can be used as accelerators for the epoxy-acid anhydride curing system, reducing the activation energy of the curing reaction and making the reaction easier to occur.

Quaternary ammonium salts and quaternary phosphonium salts
Quaternary ammonium salts: Such as tetramethylammonium chloride, tetrabutylammonium bromide, etc. These accelerators can promote the curing reaction of epoxy resin through ionic action and can play a role in accelerating the curing in some epoxy-amine curing systems.
Quaternary phosphonium salts: For example, ethyltriphenylphosphonium bromide. It has good thermal stability and shows excellent accelerating effects in high-temperature curing powder coating systems, improving the curing rate and performance of the coating.

Other accelerators
Borides: Such as boron trifluoride monoethylamine complex. It is a strong Lewis acid and has a strong accelerating effect on the curing of epoxy resin. It is commonly used in curing systems such as epoxy-amine and epoxy-phenolic. However, when using it, attention should be paid to controlling the dosage to avoid affecting the performance of the coating.

Yueyang Zhongzhan Technology specializes in the production of epoxy accelerators DMP-30/K54. The product quality far exceeds the national standards. The production process is mature, and the product performance is excellent. Epoxy coating production enterprises are welcome to establish long-term and friendly cooperation with us directly.

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