Preparation process of modified heavy calcium carbonate

Abstract

The invention discloses a preparation process of modified heavy calcium carbonate. The preparation process comprises the following steps: simultaneously adding a modified grafting agent and an ethanolsolution into a stirring reaction cylinder of a dispersive feeding type stirring device, simultaneously dividing heavy calcium carbonate into three equal parts, respectively adding the three equal parts into three dispersive feeding mechanisms, stopping stirring after the reaction is completed, discharging, filtering the obtained material, and drying to obtain the modified heavy calcium carbonate. In the process for improving heavy calcium carbonate, the dispersive feeding type stirring device is used, a first material guide cylinder, a second material guide cylinder and a third material guide cylinder in the device go deep into the three positions of the center edge side and the middle of the stirring reaction cylinder, materials are evenly added into the different positions of the stirring reaction cylinder, meanwhile, due to the fact that the whole dispersed feeding mechanism conducts feeding in the rotating process, stirring is conducted while feeding is conducted, and then sufficient mixing of the materials is achieved.

Description

technical field [0001] The invention belongs to the field of preparation of heavy calcium carbonate and relates to a preparation process of modified heavy calcium carbonate. Background technique [0002] Ground calcium carbonate is widely used in the preparation process of toothpaste due to its high wear resistance, but because the particle size of ground calcium carbonate particles in toothpaste is very small, it is easy to agglomerate and difficult to disperse evenly, resulting in toothpaste colloid Evenly, the prior art usually reacts calcium carbonate with a modifier for modification. In the modification process, due to the small particle size of calcium carbonate, it is easy to directly add calcium carbonate into the reaction vessel and then react with the modifier. Causing calcium carbonate to agglomerate, making it impossible to modify evenly and completely, affecting the overall performance of the modified calcium carbonate. Contents of the invention [0003] The ...

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Problems solved by technology

[0002] Ground calcium carbonate is widely used in the preparation process of toothpaste due to its high wear resistance, but because the particle size of ground calcium carbonate particles in toothpaste is very small, it is easy to agglomerate and difficult to disperse evenly, resulting in toothpaste colloid Evenly, the prior art usually reacts calcium carbonate with a modifier for modification. In the modification process, due to the small particle size of calcium carbonate, it is easy to directly add calcium carbonate into the reaction vessel and then react with the modifier. Causing calcium carbonate to agglomerate, making it impossible to modify evenly and completely, affecting the overall performance of modified calcium carbonate

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