Silica wet gel with narrow particle size distribution and preparation method and application thereof

Abstract

The invention belongs to the technical field of silicon dioxide preparation, and provides silicon dioxide wet gel with narrow particle size distribution and a preparation method and application thereof, and the preparation method comprises the following steps: S1, preparing a sodium silicate solution and a sulfuric acid solution; s2, adding a sodium sulfate solution, heating, dropwise adding a sulfuric acid solution until the pH value is 1.2-2.6, dropwise adding acid and alkali at the same time, and keeping the reaction pH value to be 1.2-2.6; s3, adding sodium dodecyl benzene sulfonate when the sodium silicate solution is added to 6m < 3 >; s4, adding polyethylene glycol when the sodium silicate solution is added to 12 m < 3 >; s5, when the sodium silicate solution is added to 27m < 3 >, stopping dropwise adding the sodium silicate solution and the sulfuric acid solution; and S6, carrying out wet grinding, washing and packaging treatment to obtain the silicon dioxide wet gel. The prepared silicon dioxide wet gel particles are uniform in particle size distribution and small in particle size, the toothpaste prepared from the silicon dioxide wet gel particles is moderate in gravel feeling, appropriate in consistency, fine and smooth in toothpaste body and smooth in taste, and the performance quality of toothpaste products is improved.

Description

technical field [0001] The invention belongs to the technical field of silicon dioxide preparation, and in particular relates to a silicon dioxide wet gel with narrow particle size distribution and a preparation method and application thereof. Background technique [0002] Silica is an inorganic material widely used in the fields of oral cavity, rubber, food, drug and cosmetics. Because of its very stable physical and chemical properties, acid and alkali resistance, high temperature resistance, no pollution to the environment, good cleaning performance, friction force It does not damage the teeth, and has good compatibility with the raw materials in toothpaste and high fluorine compatibility, so it replaces other raw materials such as calcium carbonate as the abrasive and thickener of toothpaste. [0003] At present, in the prior art, silicon dioxide is prepared by reacting sodium silicate and sulfuric acid by a precipitation method, and the reaction process and subsequent t...

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Problems solved by technology

[0006] In order to solve the problem that the silica wet gel prepared by the precipitation method is not uniform, has a strong gritty feeling, and the consistency of the toothpaste prepared by using the silica wet gel is not enough, the precipitation method recorded in the patent document publication number CN110342527A is used to prepare the silica gel. Silicon, after testing, the particle size distribution of silicon dioxide is 5-25 μm for D10, 40-60 μm for D50, and 75-95 μm for D90. The silicon dioxide particles have problems such as large particle size, strong gritty feeling, and uneven particles.

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