Low-density colored silica particle with porous structure and preparation method of low-density colored silica particle

Abstract

The invention belongs to the technical field of precipitated silica and specifically relates to a low-density colored silica particle with a porous structure and a preparation method of the low-density colored silica particle. The preparation method comprises the steps: S1, dropwise adding a water glass solution into a sulfuric acid solution to prepare an acidic silica sol solution; S2, filling areaction tank with the sulfuric acid solution and hydroxyethyl cellulose, then, simultaneously and dropwise adding the acidic silica sol solution and the water glass solution, ending the operation ofdropwise adding the acidic silica sol solution, then, further and dropwise adding the water glass solution until the pH value reaches 3-4, adding a pigment, then, dropwise adding the water glass solution to reach an end-point pH value, and carrying out stirring until a gel is separated from a system; S3, adding ethanol and glycerol into the gel, and carrying out stirring; and S4, carrying out pressure filtering, drying, smashing, washing and drying on the gel to prepare the colored silica particle. The silica particle is good in suspension property, adsorption property and mild grinding property, suitable for application to household chemicals such as body wash, cleaning milk and toothpaste and good in application prospect.

Description

technical field [0001] The invention belongs to the technical field of precipitated silica, and in particular relates to a low-density colored silica particle with a porous structure and a preparation method thereof. Background technique [0002] With the progress of society and the improvement of people's material life, people's consumption concepts have changed, and consumers have more diversified requirements for products, not only requiring high quality and efficiency of products, but also requiring them to have a certain beauty. Colored silica particles have high dyeing rate, stable coloring, non-toxic and pollution-free, stable chemical and physical properties, so they are widely used in daily chemical products such as shower gel, facial cleanser, washing powder, toothpaste, etc. [0003] However, the density of colored silica particles currently on the market is relatively high, and they tend to sink during the production process, resulting in uneven distribution of p...

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Problems solved by technology

[0004] Patent document CN106009782A discloses a method for preparing surface-modified silica particles. The method uses sodium bicarbonate, water glass and sulfuric acid as reaction raw materials, and uses cationic polyacrylamide as a modifying agent to prepare a particle with a density of 0.20- 0.30g / ml, colored silica friction particles with a suspension time of 50 to 60 minutes in the toothpaste solution system, but cationic polyacrylamide has a strong flocculation effect, which leads to localized gelation in the preparation process and difficulty in stirring. Production high energy consumption

[0005] Patent document CN108046273A discloses a preparation method of highly adsorbable silica, which uses water as the reaction bottom liquid, and at a reaction temperature of 65-75°C, the first step simultaneously adds high-modulus water glass solution and sulfuric acid The solution is neutralized, and the second step continues to add low-modulus water glass solution and sulfuric acid solution for neutralization reaction, and finally the specific surface area is 600-800m 2 / g, the apparent density is 0.14g / cm 3 Silica with an oil absorption value of 320-350ml / 100g, which is suitable for use as a detergent aid, but basically does not have friction properties

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