Some applications of quartz powder as a filler


What is quartz powder?

Quartz powder (same as quartz sand) is also called silica powder. It is a hard, wear-resistant and chemically stable silicate mineral. Its main mineral component is SiO2. The color of quartz powder is milky white or colorless and translucent. It has a hardness of 7 and a density of 2.65. It is insoluble in acid and slightly Soluble in KOH solution, melting point 1650°C. Generally, products with a fineness below 120 mesh (less than 120 mesh) are called quartz sand, and products with a fineness of more than 120 mesh are called quartz powder. Due to the difference in fineness and shape, quartz powder can be divided into nano-silica (white carbon black), spherical silica powder, etc.

Overview of quartz powder application industry

Quartz powder is used in a wide range of industries, among which the products used in glass industry, machinery industry, artificial quartz stone plate, ceramics and metallurgy, construction, chemical industry and other industries have a mesh size of tens to hundreds of mesh, and the purity requirements are different; in plastics , coatings, adhesives and other industries are used as fillers, and the fineness requirements are from several hundred to several thousand meshes, and the purity requirements are relatively high; when used in the integrated circuit industry, the product mesh number and purity requirements are the highest.

Some applications of quartz powder as a filler

Filler, also known as filler, is a type of material added to plastics, rubber, coatings, etc. for filling. It can improve the performance of materials, improve process characteristics, and reduce costs. Quartz powder is used as a filler in a wide range of applications, mainly in plastics, coatings, paints, epoxy floors, rubber, sealants, etc.

1. Application of quartz powder in plastics

Basic indicators: Fineness: 400-2500 mesh Purity >99.5% Whiteness: 80-94
Quartz powder is used as a filler in plastics to increase the wear resistance, dimensional stability, and thermal stability of plastics. It can be used in polyvinyl chloride (PVC) flooring, polyethylene and polypropylene films, epoxy molding compounds and other products.
Silica powder filled polyvinyl chloride floor tiles can enhance the wear resistance of the product, and in PVC flooring, improve the surface smoothness and scratch resistance of the floor. In the PVC acid-resistant sheet pipe, the processing performance is improved, the viscosity is low, and the fluidity is good, which is beneficial to the extrusion and molding of the product, and the acid resistance of the acid-resistant sheet pipe produced is significantly improved.
Silica powder filled polyethylene agricultural film can improve the physical and chemical properties and optical properties of the product, and filled polypropylene can improve the mechanical properties of the product. For example, adding quartz powder improves the function of blocking infrared rays, slows down the heat loss of plastic greenhouses, and improves its thermal insulation performance. As a filler, ultra-fine quartz powder has good fluidity, uniform distribution and good mechanical properties in PE resin.
In epoxy molding compound, using quartz powder as filler can reduce thermal expansion coefficient, water absorption, molding shrinkage and cost of epoxy molding compound; improve heat resistance, mechanical strength, dielectric properties and thermal conductivity.

2. Application of quartz powder in coating

Basic indicators: Fineness: 400-2500 mesh Purity >99.5% Whiteness: 70-94
In the coating industry, the particle size, whiteness, hardness, suspension, dispersibility, low oil absorption and high resistivity of microsilica powder can improve the corrosion resistance, wear resistance, insulation and high temperature resistance of coatings. Microsilica used in coatings has always played an important role in coating fillers due to its good stability. Especially for exterior wall coatings, SiO2 raw materials play a decisive role in weather resistance.

3. Application of quartz powder in epoxy floor paint

Basic indicators: fineness: 400-1500 mesh purity >99% whiteness: 70-94
In epoxy floor paint, due to the high hardness of silicon micropowder, the wear resistance, impact resistance and scrub resistance of the floor paint can be improved. Due to the stable chemical properties of silica, it can improve the acid resistance, alkali resistance and corrosion resistance of epoxy floor paint. For spherical silica powder, compared with traditional silica powder, it has a higher viscosity when used in epoxy floor paint. Low, good fluidity, good stackability, easy compaction, easy to combine with epoxy resin, can save the amount of epoxy resin.

4. Application of quartz powder in rubber

Basic indicators: Fineness: 1250-5000 mesh Purity >99.5% Whiteness: 70-94
Quartz powder in rubber can make the rubber firm, reduce the density of the rubber material, and increase the thermal insulation performance. It is suitable for making insulating rubber materials, model products and foam products, and can increase the softening temperature when used in hard rubber.
In wear-resistant rubber products, it requires the mixed rubber to have good permeability and strong cohesiveness. The mixed rubber filled with silica powder fully reflects the thinness of the rubber material, good permeability, good dispersibility, and cohesiveness. Strong and other unique properties, which are beneficial to the rubbing of the mixed rubber on the canvas and enhance the adhesive strength between the film and the canvas, and the mechanical properties such as the tear strength and permanent deformation of the product.
Silica is used as a good reinforcing agent for synthetic rubber, its reinforcing performance is second only to carbon black, and even better than carbon black after proper surface treatment. For example, adding a certain amount of silica to ordinary tires can improve the service life of tires. In rubber shoes, silica not only has good reinforcement, wear resistance, anti-skid and adhesiveness of vamp, but also is a good light-colored reinforcing material. Therefore, in the development of rubber shoes, it provides the quality and Style plays a big role.

5. Application of quartz powder in sealant

Basic indicators: Fineness: 1250 mesh Purity >99.5% Whiteness: 80-94
Quartz powder generally needs to be modified in the sealant, and the water content after treatment is controlled below 0.1%, which can improve the adhesive strength, yield value and shear dilution index of the colloid when used in the sealant. It has thickening, reinforcing, tear-resistant and anti-aging effects.

Silica powder – non-toxic, odorless, non-polluting non-metallic material
Characteristics and application examples of typical high-purity quartz raw materials