Silicon dioxide slurry for wet toothpaste and preparation method thereof

Abstract

The invention belongs to the technical field of silicon dioxide preparation, and particularly relates to silicon dioxide slurry for wet toothpaste and a preparation method thereof. The preparation method comprises the following steps: S1, adding polyvinylpyrrolidone into a sulfuric acid solution to obtain a mixed solution; S2, injecting water glass into a reaction tank, carrying out heating, thenadding sodium stearate and soluble starch, dropwise adding the mixed solution until a pH value is 8.0-9.0, stopping adding acid, and carrying out stirring until initial particles appear; S3, adding asodium sulfate solution, carrying out heating, and dropwise adding water glass and a sulfuric acid solution at the same time for a reaction; and S4, after the sodium silicate is completely added, dropwise adding a sulfuric acid solution until a final pH value is reached, adding a formic acid solution, carrying out aging, and then carrying out filter pressing, washing and pulping to obtain the silicon dioxide slurry. When the silicon dioxide slurry is applied to toothpaste, the addition amount of water can be reduced, the manufacturing cost of the toothpaste can be saved, the toothpaste can beendowed with good friction cleaning performance, the viscosity increase of the toothpaste can be effectively inhibited, and the silicon dioxide slurry has good application prospects.

Description

technical field [0001] The invention belongs to the technical field of silica preparation, and in particular relates to a silica slurry for wet toothpaste and a preparation method thereof. Background technique [0002] Toothpaste grade silica currently on the market is generally powdered precipitated silica. Powdered silica needs to consume a lot of energy for drying, the production efficiency is low, and dust pollution is easily formed during production and use. At the same time, in the toothpaste production process, powdered silica is physically mixed with the liquid phase and other solid phase components in the formula to form a paste, and finally the powdered silica is wetted in the liquid phase. Therefore, it is urgent to develop a toothpaste that can omit drying. Links of wet toothpaste with silica slurry. [0003] The raw materials for the preparation of toothpaste include abrasives, thickeners and preservatives, etc., and the wet silica slurry can act as both an ab...

AI Technical Summary

Problems solved by technology

[0005] In order to reduce the impact of frictional silica on the viscosity of toothpaste, most methods of in-situ modification are used to modify hydrophobic groups on the surface of silica or reduce the content of hydroxyl groups on its surface, so as to reduce the viscosity of its aqueous solution and toothpaste, such as patent Document CN108190900A discloses the use of ethanol as a modifier, and through process improvement, the silicon dioxide can reduce the specific surface area under the premise of maintaining a high water absorption and oil absorption value, thereby reducing the viscosity of the toothpaste powder and suppressing the viscosity of the toothpaste. growth; however, the particle size of the silicon dioxide prepared by this method is relatively large and needs to be pulverized

[0006] To sum up, in view of the single preparation method and performance of silica slurry for wet toothpaste, it is necessary to enrich the preparation method of silica slurry for wet toothpaste, increase its solid content, and reduce the concentration of silica at the same time. Particle size, making it suitable for toothpaste without wet grinding or crushing, and reducing the specific surface area on the basis of maintaining a high oil absorption value, so as to inhibit the growth of toothpaste viscosity

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