1. Definition and composition
Silica sol: Silica sol is a colloidal solution of colloidal particles of silicon dioxide dispersed in water, also known as silica sol or silica hydrosol. Its appearance is mostly milky white or light blue transparent solution, mostly stable alkaline, and a few are acidic. The concentration of SiO2 in silica sol is generally 10%~35%, and can reach 50% when the concentration is high.
Silicon resin: Silicone resin is a thermosetting polysiloxane polymer with a highly cross-linked structure. It has the dual characteristics of organic resin and inorganic material, and has unique physical and chemical properties, including good electrical insulation, temperature resistance and waterproof effects.
2. Properties and uses
Silica sol:
Properties: The specific surface area of silica sol particles is 50400m²/g, and the particle size range is generally 5100nm, that is, at the nanometer scale. It has the characteristics of low viscosity, good dispersibility and permeability, and can form a continuous adhesive hard film.
Uses: Silica sol is widely used in casting, refractory materials, ceramics, coatings, inks, paper, textiles, rubber, plastics, medicine, food and other fields. Especially in the casting industry, silica sol is used as a sand binder to improve the dimensional accuracy and surface finish of castings.
Silicone resin:
Properties: Silicone resin has excellent heat resistance, cold resistance, weather resistance, electrical insulation, hydrophobicity and anti-sticking demolding properties.
Uses: Silicone resin is widely used as high and low temperature resistant insulating paint, heat resistant coating, weather resistant coating, ablation resistant coating and high and low temperature resistant, electrical insulation molding plastics. In addition, silicone resin can also be used to make sealants, adhesives, potting materials, etc.
3. Summary
In summary, there are significant differences between silica sol and silicone resin in terms of definition, composition, properties and uses. Silica sol is a colloidal solution, mainly used in casting, coatings and other fields; while silicone resin is a high molecular polymer with a variety of excellent physical and chemical properties, which is widely used in electronics, electrical, construction, medical and other fields.