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Dispersants can also improve pigment wetting - Houhuan Kimia

Dispersants can also improve pigment wetting

Dispersan pigmen HH2011X terutama mengandalkan tolakan elektrostatik untuk menstabilkan partikel pigmen dalam sistem berbasis air. Polymers containing acrylic acid or maleic anhydride are often used to disperse inorganic pigment particles. Carbon black and organic pigments are mainly stabilized by nonylphenol polyoxyethylene ether, but because nonylphenol is toxic, nonylphenol has been banned in paint formulations.

Hydrophobic-hydrophilic amphiphilic block polymers are excellent pigment dispersants. The hydrophobic segment in the dispersant molecule coats the particle surface through hydrophobic interactions with carbon black and organic pigments, and the hydrophilic segment coats the particle surface through electrostatic and steric hindrance. Providing stability. By controlling the composition and degree of polymerization of the hydrophobic and hydrophilic segments, maximum dispersion effect can be obtained.

 

Pigment dispersant

There is a significant difference in pigment dispersion in solvent-based and water-based systems. In solvent-based systems, wetting is usually easier because the surface tension of the solvent and resin is low and no special additives are required to improve pigment wetting. Due to the high surface tension of water, special additives are required to reduce the surface tension so that low surface tension pigments can be fully wetted by the aqueous phase.

Addition-fragmentation chain transfer radical polymerization (RAFT) can synthesize block polymers. The amphiphilic hydrophobic-hydrophilic block polymer water dispersant HD-2011 is synthesized using RAFT technology, which is used to disperse carbon black and organic pigments in water. After testing, dispersan Hohuan Chemical HH2011 memiliki efek pendispersian yang baik pada karbon hitam dan pigmen organik. Pasta warna FW200 dan pasta warna PV23 yang dibuat dengan HH2011 memiliki distribusi ukuran partikel pigmen yang sempit, fluiditas yang baik, dan stabilitas termal yang baik. Pasta warna dalam lateks Penerimaan warna yang baik dalam cat.

Dalam pelapisan, pigmen merupakan komponen penting. Pigmen dengan ukuran partikel yang dioptimalkan memiliki daya tutup dan kekuatan pewarnaan yang paling besar. Namun, selama pengangkutan dan penyimpanan, partikel pigmen primer akan membentuk agregat atau aglomerat. Selama proses produksi pelapisan, ada kebutuhan untuk menyebarkan kembali agregat atau aglomerat menjadi partikel primer dan menstabilkan partikel primer. Hanya dengan cara ini pigmen dapat memberikan kekuatan pewarnaan yang tinggi, ketahanan pigmen terhadap cuaca, dan stabilitas penyimpanan. Selama proses penyebaran, fase cair pertama-tama membasahi partikel pigmen, dan kemudian gaya mekanis memecah agregat. Fungsi dispersan adalah untuk menstabilkan partikel yang pecah dan mencegahnya berkumpul kembali.

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