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Yuan lei small class | non-metallic mineral powder surface modification, these 5 moves are enough

Release time:

2024-01-29 09:35

 

Yuan lei small class | non-metallic mineral powder surface modification, these 5 moves are enough

 

There are many methods of surface modification, which can change the physical and chemical properties of the surface or interface of non-metallic mineral powder, such as surface physical coating, chemical coating, inorganic precipitation coating or film, mechanical force chemistry, chemical intercalation and so on. At present, the commonly used methods of surface modification of non-metallic mineral powder in industry mainly include surface chemical coating modification method, precipitation reaction modification method and mechanical chemical modification method and composite method.

 

1. Surface chemical coating modification method

This is the most commonly used non-metallic mineral powder surface modification method, This is a method that uses the functional groups in the molecules of the organic surface modifier to adsorb or chemically react on the surface of the particle to modify the surface of the particle. The surface modifiers used are mainly coupling agents (silane, titanate, aluminate, zirconium aluminate, organic complexes, phosphate esters, etc.), surfactants (higher fatty acids and their salts, higher amine salts, nonionic surfactants, silicone oils or silicone resins, etc.), organic oligomers and unsaturated organic acids, etc. Modification process can be divided into two kinds of dry and wet.

2. Precipitation reaction method

It is a kind of powder surface modification method of "inorganic/inorganic coating" or "inorganic nano/micro powder coating" to coat the surface of the modified particles by chemical precipitation reaction. Nano-TiO Coated on Powder Surface2GHO ZnO its3The modification of such inorganic substances is achieved through precipitation reactions, such as mica powder surface coated with TiO.2Preparation of pearlescent mica pigment and titanium dioxide coated with SiO2and Al2O3.

3, mechanical force chemical modification method.

The use of ultrafine grinding process and other strong mechanical force to purposefully activate the particle surface, make its structure complex or amorphous, and enhance its reactivity with organic or other inorganic substances. Mechanochemical interactions can enhance the active sites and active groups on the particle surface, enhancing their use with organic matrices or organic surface modifiers. Mechanical fusion technology, which is developed on the basis of the principle of mechanochemistry, is a method of composite treatment or surface modification of inorganic particles, such as surface composite, coating and dispersion.

4. Chemical intercalation modification method

A modification method that uses the characteristics of weak binding force (such as molecular bonds or van der Waals bonds) or the existence of exchangeable cations between the crystal layers of powder particles with layered structure, and changes the properties of powder through chemical reaction or ion exchange reaction.

Therefore, the powder for intercalation modification generally has a layered or quasi-layered crystal structure, such as montmorillonite, kaolin and other layered structure of silicate minerals or clay minerals and graphite. Most of the modifiers used for intercalation modification are organic and inorganic.

5. Composite modification method

A variety of methods (physical, chemical and mechanical, etc.) are used to change the surface properties of the particles to meet the needs of the application. At present, the applied composite modification methods mainly include physical coating/chemical coating, mechanical force chemical/chemical coating, inorganic precipitation reaction/chemical coating, etc.

 

 

 

 

 

 











Non-metallic, modified, surface, chemical, method, mechanical, particulate, precipitation, mineral, inorganic

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