Hydrated Silica in Toothpaste
Silica for toothpaste is an amorphous powder, tasteless, insoluble in water or acid, chemically inert, and has good solubility with fluoride and other raw materials in toothpaste. The structure and particle size of silica can be controlled by production conditions. According to different types of toothpaste, three products are produced respectively: friction type, mixed type and thickening type.
SiO2: nH2O, molecular weight 60.08 (anhydrous), usually containing 10-15% crystal water, with an average particle size of 4-8 μ m, is chemically inert, and has good compatibility with fluoride and other components in dental development. It is an abrasive with rapid development in recent years.
The structure and particle size of silica can be controlled by reaction conditions, which also controls the friction force of silica. It is convenient to produce toothpastes with good cleaning power and without dentin damage.
Another characteristic of silicon dioxide is that transparent toothpaste can be produced. The refractive index of silicon dioxide is 1.43-1.45. When the refractive index of toothpaste liquid composed of water, sorbitol and glycerin is equal to that of silicon dioxide, the education body will be in a good transparent state.
Our product JS-80 is use in toothpaste for abrasive.Specifications is as below:
Test Methods | Properties | Units | Target Values (Spec Limits) | Actual Values |
HG/T3065-2008 | Loss on drying (2Hrs,105℃)加热减量 | % | Max.6.0 | 4.8 |
HG/T3066-2008 | Ignition loss 1000℃ 灼烧减量 | % | Max.7.0 | 5.1 |
HG/T3072-2008 | DBP absorption value DBP吸收值 | cm3/g | 0.5-1.0 | 0.7 |
HG/T3067-2008 | pH value (10%aqueous suspension) pH值 | — | 6.0-8.0 | 7.4 |
HG/T3062-2008 | SiO2 (Dry Basis) 二氧化硅(干基） | % | Min.97 | 98.1 |
HG/T3073-1999 | BET specific surface area BET比表面积 | m2/g | 50-100 | 79 |
Soluble salt (Na2SO4) 可溶性盐 | % | Max.1.0 | 0.4 | |
Particle size 粒径D50 | μm | — | 15 |
Packaging: 10kg/paper bag,17MTS/40HQ
FAQ:
How to make hrdrated silica?
Silica is made of quartz sand and soda at 1200 ° C to dissolve and melt into water glass, and then pressurized to water into water glass solution at 130 ° C, and then precipitated with sulfuric acid. After * * is vacuum filtered, dried and air crushed, the finished product is packaged.
What is the use of silica?
Silica is widely used in toothpaste, food, medicine and other industries. The paste can be used as friction agent, thickener, and anti caking agent in food and medicine.
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