Surface modification of ceramic pigments and polymer dispersants Inorganic pigments are widely used in the fields of coatings and inks. With the development of science and technology and the demand of the market, pigment powders are developing in the direction of ultra-fineness, which makes the surface energy of the pigments high and the particles It is easy to agglomerate between them, and its dispersibility, tinting strength and covering power are affected, so necessary treatment should be carried out during use to improve its dispersion performance.
The special dispersing agent for ceramics is anionic modified polycarboxylate sodium salt, which is specially used for dispersing in ceramic slurry. The dispersant for ceramics has excellent dispersibility and is used in a small amount. The dispersant for ceramics has good compatibility with inorganic pigments, and there is no residue during high temperature sintering of ceramics. Ceramic dispersants are widely used in ceramic industry and concrete manufacturing.
The main component of ceramic dispersant is anionic polymer salt, which can be adsorbed on the surface of various tiny particles and generate electrostatic repulsion to disperse them, avoiding sedimentation and coarsening. Mainly used as additives in magnetic materials, electronic ceramics, paper industry, alumina ceramics, household ceramics, byk additives for coatings and other industries. Adding ceramic dispersants during the grinding process of the slurry can greatly reduce the viscosity of the processed materials and facilitate the processing of materials. and the slurry viscosity is stable after dispersion. The ceramic dispersant is completely volatilized during the firing process of the product, and has no effect on the physical and chemical properties of the product.
Ceramic dispersants are used in various organic pigments, such as azo, copper phthalocyanine, heterocyclic and lake types, and inorganic pigments such as carbon black. Pigment dispersants have significantly improved long-term dispersion stability of the system. Organic pigment dispersant is used in pigment printing, water-based printing ink, water-based paint and other dispersion systems. The organic pigment dispersant has excellent dispersion stability, so that the particles are stably distributed in the range of dozens of nanometers, and can significantly increase the coloring strength of the product. First, the organic pigment dispersant is formulated into a solution of appropriate concentration, and then the pigment is added and ground. Usually the concentration of the dispersed pigment is 30%-40% of the total weight of the slurry, and the amount of the dispersant is 5-15% of the weight of the pigment.
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