Method for preparing hydrophobic white carbon black

Abstract

The invention discloses a method for preparing hydrophobic white carbon black. The method comprises the steps of drying precipitated white carbon black to constant weight, then mixing with a modifier solution, adjusting a pH value to 8; and at a temperature of 30-90 DEG C, stirring for a reaction for 20-100 min with a stirring speed of 250-450 rpm, then filtering, and drying to obtain the hydrophobic white carbon black. The modifier is selected from one or more of cetyltrimethylammonium chloride, hexadecyltrimethylammonium bromide, dodecyltrimethylammonium chloride, and dodecyltrimethylammonium bromide. The activation degree of the modified white carbon black is obviously improved and can reach 95% or more, and the modified white carbon black is the hydrophobic white carbon black. The method of the invention is simple in process, has the solvent with cleanliness and no pollution; and the modified white carbon black has the hydrophobic property improved significantly, and thereby being beneficial to improving compatibility when adding into rubber and plastics.

Description

1. Technical field [0001] The invention relates to a preparation method of white carbon black, in particular to a preparation method of hydrophobic white carbon black. 2. Background technology [0002] Silica is hydrated silicon dioxide (SiO 2 ·nH 2 O), is a white, non-toxic, amorphous fine powder, with excellent properties such as light weight, good chemical stability, porosity, high temperature resistance, non-combustibility, and good electrical insulation. Silica is mainly used in the rubber industry. It improves the tear resistance and bonding of rubber with its excellent reinforcing properties, and its performance is obviously better than that of ordinary carbon black. In addition, white carbon black can also be used as a filler in chemical products such as coatings, plastics, paints, inks, etc., and its application fields are constantly expanding. [0003] The preparation methods of white carbon black mainly include precipitation method and gas phase method, among w...

AI Technical Summary

Problems solved by technology

At present, the surface modification of silica is mainly carried out by adding coupling agents, long-carbon chain alcohols or polymers. The degree of hydrophobicity of the modified silica has been improved to a certain extent, but the modification process is relatively complicated. The process requires the use of a large amount of organic solvents, which increases the cost of modification, complicates the post-processing of the product, and easily causes certain environmental pollution