A kind of low-density colored silica particles with porous structure and its preparation

Abstract

Provided are low-density colored silica particles having a porous structure, and a preparation method thereof. The preparation method comprises: dropwise adding a sodium silicate solution to a sulfuric acid solution to obtain an acidic silica sol solution; injecting the sulfuric acid solution and hydroxyethyl cellulose into a reaction tank, then adding the acidic silica sol solution and sodium silicate solution simultaneously; after the acidic silica sol solution is added dropwise, continuing to add the sodium silicate solution dropwise until the pH value is 3–4; adding pigment and then adding sodium silicate solution dropwise until a final pH value is reached, then stirring until the system precipitates a gel; adding ethanol and glycerol to the gel and stirring; pressure-filtering, drying, crushing, washing, and drying the gel to obtain colored silica particles. The silica particles have good suspension performance and adsorption performance, and mild friction performance, and are suitable for application in everyday products such as shower gel, facial cleanser, and toothpaste, and thus have good prospects for application.

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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