Powder Coating Additives are an important part of powder coatings and play an increasingly important role in expanding the field of application of powder coatings.Compositions of powder coating auxiliaries in China are more complex and most of them are small ones, most of which are not the source Production companies, do not have the ability to synthesize, are purchased liquid additives compound into powder.In addition there is a small amount of foreign imported additives in the market of powder coatings in our country, but due to price factors, mainly for high-end areas; with the Chinese powder Coatings to expand influence, foreign aid companies in China's powder coating more and more attention.
In 2016, the sales volume of additives for powder coatings in China was 74,900 tons, up 3.0% over the same period of last year, and the average selling price of various additives was 27.4 yuan / kg, up 9.6% over the same period of last year.In the past two years, However, at the same time, some enterprises are also facing an increasingly risk of shutting down or relocating to the environment. It is estimated that there will be a reshuffle in the field of additives in the coming years.
At present, solid acrylic resin for powder coatings is mainly used for extinction, mainly epoxy and carboxyl functional groups. The research focuses mainly on extinction efficiency and extinction stability, including adjusting the monomer formula to achieve the required functionality and glass Temperature, adjust the process to obtain the appropriate molecular weight and distribution, etc. There are three bottleneck factors: (1) the lack of basic research on the application of polymerization process, such as the new controlled polymerization process, the application of bulk polymerization process; ( 2) Lack of equipment systems that are compatible with the new polymerization process, such as high vacuum equipment, on-line control equipment, high-mass transfer of highly viscous materials, heat transfer equipment and control systems, etc .; (3) lack of high quality monomer materials, Is fluorine, silicon and other special features lack of monomers.
Based on the current state of the art and equipment, the first and most likely breakthrough technology is the use of imported special monomers to modify existing products to achieve specific application performance, such as super weathering, superhydrophobic, high toughness, etc. Second In the research of new polymerization process, it is suggested that manufacturing enterprises with basic industry in the industry should cooperate with colleges, institutes and equipment enterprises to integrate advantageous resources such as process research, equipment development and industrialization enlargement, etc., and present the theoretical basis of block polymerization , Controlled polymerization, bulk polymerization and other processes used in industrial production, significantly improve product quality and performance, broaden the product applications.
At present, the domestic polymerization process for solid acrylic resin to free radical polymerization, the process is more stable, less demanding equipment, product quality is also unsatisfactory.New production technology, including the pipeline has been applied abroad free radical polymerization , There is a theoretical basis of active / controlled free radical polymerization, as well as pharmaceutical and chemical microreactor highly controlled polymerization, etc., are expected to be used in solid acrylic resin synthesis.New raw materials and products, there are The introduction of fluorine-containing monomer super-weather acrylic resin, the introduction of macromonomer comb-shaped molecular structure, can provide high content of multi-functional acrylic resin terminal, the introduction of silicon-containing monomer, high heat resistance, high toughness acrylic resin and so on.