4/2/2023 0 Comments Crystalline silica![]() ![]() The silica grades used in the coatings industry are produced synthetically and typically meet greater quality control standards, often having tighter physical-chemical requirements, such as color and brightness. Silica is also an important raw material for the formulation and production of defoamers. These include rheological control, enhanced film formation, improved mechanical properties of the final coating film, free flow and fluidization enhancement of powders, and control of gloss. ![]() Silica is also an important raw material for the coatings industry, as it can provide a wide range of functionalities and benefits. It is estimated that quartz, the most stable form of this complex family of materials, makes up more than 10% of the earth’s crust and, as a major component of the natural sands widely used in the construction industry, is a key raw material to produce glass and silicon. Silica, or silicon dioxide, is one of the most abundant minerals present on earth. This article will address how amorphous silica technology is differentiated and engineered to create specially tailored solutions to enhance the performance of coatings and will highlight the latest technical developments in this field. The importance of proper dispersion and homogenous distribution within a coating matrix will be reviewed. Particle technology and modification will be addressed along with performance attributes highlighted for each of the types of tailor-made modifications. Amorphous silica is highly adaptable and flexible to be modified in both powder and pre-dispersed forms, and numerous engineered types of technologies have been developed to provide functional solutions to many coatings problems.Īmorphous silica technology has been developed to address functionalities including: rheological control, suspension of pigments and fillers, and reinforcement of coatings film to impart scratch resistance, hydrophobicity / anti-corrosion benefits, and oleophobicity as a carrier of trace actives into coatings for homogenous distribution for flow control, charge, and fluidization enhancement of powdered coatings and gloss reduction of liquid systems. With ongoing scrutiny and sensitivity in the coatings industry to move towards less hazards in the workplace, greater emphasis is placed on suitable amorphous technology to replace crystalline silica technology. This large, varied class of fillers is generically broken into two categories of crystalline and amorphous morphology. The field of coatings technology has utilized many forms of silica-based particles in the last 70 years. Jim Reader and Maria Nargiello, Evonik Corporation ![]()
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