Preparation method of high-performance silicon dioxide

Abstract

The invention discloses a preparation method of high-performance silicon dioxide in the technical field of silicon dioxide preparation methods. The preparation method comprises the following steps: curing a prepared water glass solution; adding a composite chelating agent, and carrying out a synthesis reaction by using sulfuric acid and water as raw materials and adding the water glass solution step by step. Specifically, the water glass solution is injected into sulfuric acid at a certain low flow rate; when the reaction end point is close, the water glass solution is slowly dropwise added ata small flow rate to accurately control the end-point pH; then, rapid peracid is realized at a relatively high acid flow rate, and the neutral time of the material from alkalinity to acidity is reduced as much as possible; and finally, silicon dioxide thick slurry is modified and dried by using a dispersion liquid to obtain a silicon dioxide product. By the preparation method of the high-performance silicon dioxide provided by the invention, the silicon dioxide with high purity, high oil absorption value and good dispersity is prepared, and the performance of rubber can be obviously improvedwhen the silicon dioxide is used as a rubber reinforcing agent.

Description

technical field [0001] The invention relates to the technical field of silica preparation methods, in particular to a preparation method of high-performance silica. Background technique [0002] At present, the conventional production methods of silica mainly include gas phase method and precipitation method, and precipitation method silica is widely used because of its simple production process, low cost and large output. Due to the special surface structure of silica (with surface hydroxyl groups and adsorbed water), special particle morphology (small particles, large specific surface area, etc.) and unique physical and chemical properties, silica is widely used in rubber, plastic, Coatings, pharmaceuticals, daily chemicals and many other fields. [0003] Adding silica to the rubber formula can improve the physical properties of the rubber compound, but in the existing silica synthesis process, water glass, sulfuric acid and dilution water are directly mixed for reaction,...

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Problems solved by technology

[0003] Adding silica to the rubber formula can improve the physical properties of the rubber compound, but in the existing silica synthesis process, water glass, sulfuric acid and dilution water are directly mixed for reaction, and the polysilicon inside the silica produced is Oxygen and active silanol groups on the outer surface and their water-absorbing characteristics make them hydrophilic. After adding silica to rubber and other materials, it is difficult for silica to wet and disperse in the organic phase, resulting in rubber products. The strong effect is not good, the performance is not high, etc.

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