Preparation method for modified hydrophobic dispersion type white carbon black

Abstract

The invention discloses a preparation method for modified hydrophobic dispersion type white carbon black, and belongs to the technical field of preparation of white carbon black. The method comprisesthe following steps: firstly, grinding rice hull to obtain rice hull powder, performing co-fermentation on the rice hull powder and river bottom sludge, taking out fermentation filter residues, placing the fermentation filter residues into a sodium carbonate solution, and performing a reaction. The method disclosed by the invention facilitates improvement of hydrophobicity of the white carbon black, and in addition, a silane coupling agent KH-570 only chemically reacts with a hydroxyl group on the surface of a self-prepared white carbon black body, a crystal structure of the self-prepared white carbon black body is not changed, so that the hydrophobicity of the white carbon black is improved; according to the method, citric acid and a sulfuric acid solution are mixed under stirring to obtain a mixed acidifying solution, the modified self-prepared white carbon black body continues to be mixed with the mixed acidifying liquid, most of white carbon black particles can be wrapped by the hydroxyl group, the white carbon black particles have higher constitutive properties and are not easy to agglomerate in an aqueous solution, so that dispersibility of the white carbon black is improved;and the method has broad application prospects.

Description

technical field [0001] The invention discloses a preparation method of modified hydrophobic dispersion type white carbon black, which belongs to the technical field of white carbon black preparation. Background technique [0002] White carbon black is the general term for white powder X-ray amorphous silicic acid and silicate products, mainly refers to precipitated silica, fumed silica and ultrafine silica gel, and also includes powdered synthetic silicic acid aluminum and calcium silicate etc. Silica is a porous substance whose composition can be SiO 2 ·nH 2 O represents, where nH 2 O exists in the form of surface hydroxyl groups. Silica is soluble in caustic alkali and hydrofluoric acid, insoluble in water, solvents and acids (except hydrofluoric acid), high temperature resistant, non-combustible, tasteless, odorless, and has good electrical insulation. According to the production method, white carbon black can be fumed white carbon black and precipitated white carbon...

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention: there are a large amount of silanol hydroxyl groups on the surface of ordinary white carbon black at present, which shows strong hydrophilicity, and is easy to agglomerate, and has poor compatibility with rubber, resulting in its The force between the rubber matrices is weak, and the defects that cannot meet the market requirements provide a method for preparing a modified hydrophobic dispersion type silica

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