Why do you want to modify the surface of the powder?

The first reason is to change the inorganic filler from a general incremental filler to a functional filler. Inorganic fillers play an important role in the polymer materials industry and polymer matrix composites such as plastics, rubber and adhesives.

Application and function of partially modified inorganic filler

Inorganic filler	Application	Function
Calcium carbonate	PVC,PE, PP, Unsaturated polyester, etc.	Increase the filling amount and material rigidity, modulus, etc.
Kaolin	Rubber, wire and cable，EPDM,PE,PP	Improve electrical insulation, mechanics, airtightness, etc., improve filling
Silicon powder	Epoxy resin, unsaturated polyester	Improve material wear resistance, electrical insulation, modulus, increase filling
Talc	Plastic (PP, PE)	Improve filler filling performance, electrical properties

The second reason is to improve the dispersibility of the paint, the pigment in the paint, and improve the color, tinting strength, hiding power, weather resistance, heat resistance, antibacterial and mildew resistance and color retention of the paint.

For example: alumina powder, silica powder coated with titanium dioxide or titanium dioxide, can improve the weather resistance of the pigment.

1.Improve surface wettability;
2.Enhance the binding force to the substrate;
3.Give coatings electrical, magnetic, antibacterial, mildew, anti-corrosion and other functions.

The third reason is that the high value-added products have good optical effects and visual effects, making the products rich in color.

After surface modification of titanium oxide powder, iron oxide powder, zirconia powder, etc., it is used as a pigment to impart pearlescent effect to cosmetics, plastic products, light-colored rubber, paint, special coatings, leather and other products, which significantly improves its quality and value.

The forth reason is that for the powder material of the layered crystal structure, a new interlayer intercalation mineral material can be prepared by intercalation modification. Such as clay mineral interlayer compounds and graphite interlayer compounds.

After the graphite layer compound is modified, it must be resistant to high temperature, thermal shock, oxidation, corrosion, lubrication, sealing and energy storage.

Bentonite has good properties of expansion, adsorption, thixotropic and bonding in non-polar and weakly polar solvents after organic intercalation.

The fifth reason is to improve the adsorption and catalytic activity, selectivity, stability and mechanical strength of the adsorption and catalytic materials.

For example, on the surface of powders such as diatomaceous earth, sepiolite, and zeolite, metal oxides (such as TiO2), alkali or alkaline earth metals, rare earth oxides, copper, silver, gold, molybdenum, nickel, and the like are supported by impregnation.

The sixth reason is to prevent the agglomeration of nano ions, improve the dispersibility of the nano powder, and improve and improve the application performance of the nano powder material.

Nano-powders have large specific surface area, large number of surface atoms and high surface energy. They are easy to agglomerate to form secondary, tertiary or larger particles during preparation, storage and use, affecting their nano-effects.

The overall purpose: to improve or improve the application performance of powder materials; to give new functions to powder materials; to meet the development needs of new materials and new technologies; to meet the needs of new product development; to achieve functionalization and high value utilization of powder materials.