Preparation method of silicon dioxide with high oil absorption value and high water absorption capacity for washing powder

Abstract

The invention belongs to the technical field of silicon dioxide, and in particular relates to a preparation method of silicon dioxide with high oil absorption value and high water absorption capacity for washing powder. The method comprises: S1, preparing S into a sodium silicate solution and a sodium hydrogen carbonate solution; S2, adding water into a reaction tank, performing heating, and simultaneously, dropwise adding the sodium silicate solution and the sodium hydrogen carbonate solution; S3, performing heating, continuously adding the sodium silicate solution, then dropwise adding the sodium hydrogen carbonate solution, performing titration of sulfuric acid until the end point, and performing aging to obtain a head product; S4, performing pressure filtration on the head product, then putting the head product into an agitator tank, adding a mixed solution of hydrogen peroxide and sulfuric acid, and performing agitation to obtain silicon dioxide; and S5, performing pressure filtration washing on the obtained silicon dioxide, and performing crushing to obtain a product. The silicon dioxide prepared by the method has high oil absorption value and high water absorption capacity, and can be used as a detergent assistant to enable the washing powder to have better solubility, dispersity, adsorbability and decontamination ability.

Description

technical field [0001] The invention belongs to the technical field of silicon dioxide, and in particular relates to a method for preparing silicon dioxide for washing powder with high oil absorption value and high water absorption. Background technique [0002] Washing powder is difficult to dissolve in water when the temperature is low, which greatly reduces its decontamination ability. Many manufacturers will increase the decontamination ability of washing powder by adding enzymes and surfactants, but enzymes cannot be fully utilized at low temperatures. It will be inactivated under high temperature conditions, and the use of enzymes and surfactants will also increase the cost of laundry detergent. [0003] Precipitated silica is an amorphous substance with high water absorption and oil absorption value, rich microscopic network structure, good diffusibility, thickening and adsorption. Polyhydroxy silica has a large water absorption capacity, a large number of silicon-ox...

AI Technical Summary

Problems solved by technology

However, the oil absorption value of silica for washing powder on the market is about 300g / 100g, and the water absorption is about 46ml / 20gH 2 O, while the water absorption and oil absorption value of silica prepared by traditional methods are not high enough, as Chinese patent application CN105236415 A discloses a preparation method of core-shell type precipitated silica, the method mainly uses sodium silicate and sulfuric acid as The raw material adopts two-step hydrothermal precipitation reaction, and strictly controls the raw material concentration, temperature and pH value of the reaction system during the reaction process, and the water absorption is 54ml / 20gH 2 O silica

Chinese patent CN1037110C discloses a kind of method of producing white carbon black, and it discloses to make water glass with Arboraceae plant as raw material, and water glass reacts with sodium bicarbonate or potassium bicarbonate to make the method for white carbon black, but this The oil absorption value of the white carbon black prepared by the method is 2.8ml / g, which still cannot meet the requirements

Images