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Yuan Lei's Little Knowledge | Application (I) of Quasi-spherical Silica Powder in Functional Coatings

Release time:

2024-01-29 09:34

In the coating industry, non-metallic mineral powder mainly plays an incremental role to reduce production costs. At present, calcium carbonate, talcum powder, etc. are the most used fillers in the coating industry due to their high whiteness and low price. As a functional coating filler, silicon powder has a good competitive advantage, especially quasi-spherical silicon powder.

Quasi-spherical silica powder is processed from natural micro-crystalline quartzite after long-term weathering in nature and is produced in a finely divided form. It has high purity, fine particles, good dielectric properties and thermal conductivity, and has the advantages of low expansion coefficient, high heat resistance, high humidity resistance, high filling amount, low expansion, low stress, low impurities, low friction coefficient, etc. It plays an important role in functional coatings.

 

 

1. Application of quasi-spherical silica powder in interior and exterior wall coatings

600~1250 Purpose Quasi-spherical silica powder plays an important role in wear resistance, corrosion resistance, insulation and weather resistance of coatings due to its good dispersion and stability.

In addition, compared with traditional architectural coatings, quasi-spherical silica micropowder is used in composite interior wall coatings, which can significantly improve the stain resistance, thixotropy, washing resistance, water resistance, alkali resistance and aging resistance of interior wall latex coatings. When quasi-spherical silica micropowder is used in interior wall latex coatings with a mesh number of 800 mesh and a mass fraction of 3%-4%, the coating performance can be improved most significantly.

 

2. Application of quasi-spherical silica powder in epoxy building structural adhesive

It is said that the silicon micropowder with quasi-spherical structure is better than the silicon micropowder with polygon in the epoxy adhesive system, which is of great practical significance to increase the application range of epoxy building structural adhesive and reduce the production cost.

In terms of the mechanical properties of building structural adhesives, compared with ordinary angular silicon powder, the shear strength and tensile strength of the adhesives made of quasi-spherical silicon powder at the same addition amount are significantly improved, while the compressive strength changes little. The reason is that the quasi-spherical silicon powder is more dense and has fewer internal defects than the polygonal silicon powder, so that the stress loss is small and the bonding strength is high. In addition, the quasi-spherical silica powder makes the epoxy adhesive steel adhesive low viscosity, high wettability, but also conducive to improve the adhesion.

 

 

3. Application of quasi-spherical silica powder in heavy-duty anti-corrosion powder coatings

Anticorrosive powder coating formula is based on polymer epoxy resin as the base material film-forming material plus a special curing agent and pigments, fillers, additives and other components. From the perspective of anti-corrosion effect, the more corrosion-resistant pigments and fillers are used, the better, but it will bring some difficulties to manufacturing and cost, such as the melt viscosity of the coating becomes larger, which is not conducive to extrusion and leveling. At the same time, the coating will become brittle after a long time. Only neutral quasi-spherical silicon powder filler is best mixed and applied.

Quasi spherical silicon powder in the anti-corrosion powder coating can be enriched into the structure of the coating, the formation of dense and strong texture of the film, play a role in chemical passivation and physical sealing.

The application of chemical resistance of phenolic modified epoxy and quasi spherical silicon powder corrosion resistance and chemical resistance, so that the heavy-duty powder coating of various performance indicators fully meet the SY/T0315-2005 standards.

Spherical, silica powder, coating, application, filler, has, strength, function, anti-corrosion

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