Preparation method of friction type silicon dioxide

Abstract

The invention discloses a preparation method of friction type silicon dioxide. The preparation method comprises the following steps of: preparation of a first tank of materials: adding sodium sulfate solution into a reaction tank, heating, and then adding hexadecyl trimethyl ammonium bromide, then adding sodium silicate solution and sulfuric acid, controlling PH value, and after addition of the sodium silicate solution, adding the sulfuric acid till the final PH value is 4.4-5.0; preparation of a second tank of materials: adding sodium sulfate solution into another reaction tank, heating, and then adding hexadecyl trimethyl ammonium bromide, then adding sodium silicate solution and sulfuric acid, controlling PH value, and after addition of the sodium silicate solution, adding the sulfuric acid till the final PH value is 4.4-5.0; while stirring, adding a half of the material of the first tank into the material of the second tank, stirring, carrying out pressing filtration, washing and crushing on the formed silicon dioxide to prepare the friction type silicon dioxide. In the silicon dioxide, the RDA (Relative Dentine Attrition) value is 120-140, the PCR (Pellicular Cleaning Ratio) value is 100-130, and the PCR / RDA is equal to 0.80-1. The friction type silicon dioxide has the advantages of low wear, high cleanness and good thickening property.

Description

Technical field [0001] The invention belongs to the technical field of silica, and specifically relates to a preparation method of friction type silica. Background technique [0002] The abrasives in the toothpaste formula occupies a large proportion. The abrasives can remove the dirt on the surface of the teeth. A good abrasive should not only clean the teeth and remove spots, but also not make the teeth wear too much. Silica is a spherical porous structure, without sharp edges and corners, it will not wear the teeth too much, and it has the characteristics of stable physical and chemical properties, strong cleaning ability, good compatibility with toothpaste system, and can be used for the preparation of transparent toothpaste. It has been widely used in the toothpaste industry. [0003] Film cleaning rate (PCR) and relative tooth loss (RDA) are industry standards to measure the effectiveness of toothpaste. Products with a toothpaste friction value of less than 50 are difficult ...

AI Technical Summary

Problems solved by technology

Among the properties of silica, the oil absorption value is related to the viscosity of the toothpaste. Generally, the higher the oil absorption value, the greater the viscosity of the toothpaste. However, if the viscosity of the toothpaste is too high, it will cause various adverse effects. More energy, greater extrusion force is required when filling, and the viscosity of the paste in the toothpaste tube has a post-swelling property, the paste is too thick to be extruded, affecting normal use