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The process of forming gel under appropriate conditions with a certain concentration of sol is called gelation. In the gelation process of silica sol, the colloidal particles form a capillary network......
2024-12-30The continuous dispersed phase constitutes the solid skeleton of the gel, the continuous dispersion medium forms the fluid part of the gel, and the particle size that constitutes the colloid makes the......
2024-12-30Also called frozen gel. Under certain conditions, the colloidal particles in the sol can be connected to each other to form a spatial network structure. The structural gaps are filled with liquid as a......
2024-12-27From the definition of colloid, as long as the particle size of the dispersed phase in different aggregation states is between 1 and 100 nm, a colloidal system can be formed in different states of the......
2024-12-26First of all, colloid is not a special substance, nor is it the nature of matter, but a special state of matter. The colloidal system is characterized by the dispersed phase particles having a certain......
2024-12-25Silica sol is a high-quality water-based binder commonly used in investment casting. Since it was introduced into investment casting in the 1960s, the process technology of shell making has been conti......
2024-12-24High-quality precision castings with smooth surfaces and clear edges and corners require high-quality investment casting shells. The physical and chemical properties of the shell at a macroscopic leve......
2024-12-23Generally, the shelf life of silica sol paint is about one year. Considering the sensitivity of silica sol to temperature, it is generally stored indoors as much as possible, not below zero degrees no......
2024-12-20The silica particles in silica sol are spherical, and its particle size is a very important parameter of silica sol. The particle size of silica sol is generally between 6nm-100nm. The particle diamet......
2024-12-19The kinematic viscosity of silica sol mainly depends on the volume fraction of the dispersed phase (i.e. silica particles) in the system, and has nothing to do with the size of its particles. Speaking......
2024-12-18Density is an important parameter of silica sol. Its size is positively correlated with the content of silica particles. Therefore, the silica content of silica sol can be indirectly judged from the d......
2024-12-17Generally speaking, the silica sol used in investment casting is alkaline silica sol with a pH value of 8.5-10. The pH value of silica sol is closely related to the stability of silica sol. From the p......
2024-12-16Na2O content. Sodium ions are the stabilizing ions of silica sol. Sodium ions come from sodium oxide. Therefore, sodium ions act as stabilizers in silica sol. However, since the colloid particles in ......
2024-12-13SiO2 content This is a very important parameter of silica sol. The strength of silica sol shell (normal temperature strength, high temperature strength, residual strength) basically depends on the Si......
2024-12-12One is that the silica particles gather and grow, and then precipitate. The other is that the silanol groups of the silica particles contained in the silica sol dehydrate, and the siloxanes are connec......
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