Method for preparing hydrophobic white carbon black by using high-alumina fly ash

Abstract

The invention discloses a method for preparing hydrophobic white carbon black by using high-alumina fly ash. The method comprises the following steps of carrying out pressure mould lifting and refining treatment on a desilication solution obtained by carrying out alkali dissolution desilication reaction on high-alumina fly ash as a raw material and an alkaline solution; adding a mould lifting desilication solution and a sulfuric acid solution into a bottom alkaline solution prepared from the mould lifting desilication solution, carrying out a sectional acidification reaction including two-stage heating and two-step cocurrent flow precipitation method reaction until the pH value is reduced, and stopping curing reaction, wherein the Na2O concentration of the bottom alkaline solution is 0.080-0.090mol/L, and a dispersant is added into the bottom alkaline solution; filtering, washing, pulping, drying and smashing to obtain a hydrophobic nanometer silicon dioxide masterbatch; dropwise adding methylsilicone oil, a trimethylchlorosilane modifier and an alcohol catalyst which have different characteristics into the masterbatch, carrying out grafting reaction and reflux reaction, and drying to obtain the hydrophobic white carbon black. By using the method, the pore volume of the hydrophobic white carbon black is increased, the regrinding process flow is simplified, and the production cost of the hydrophobic white carbon black produced by using the traditional sulfuric acid method is reduced.

Description

technical field [0001] The present invention is a kind of method that utilizes high-alumina fly ash to prepare hydrophobic white carbon black product, relates to silicone rubber mold rubber products, feed additives, pesticides, adhesives, plastic functional masterbatches such as PP (polypropylene), PE ( Polyethylene), PVC (polyvinyl chloride) PP masterbatch, plastic EVA opening agent and other synthetic technology fields. Background technique [0002] High-alumina fly ash is a special type of fly ash discovered in coal power areas such as central and western Inner Mongolia and northern Shanxi in recent years. According to statistics, the annual output of high-aluminum fly ash in the Ordos area alone can reach 30 million tons, and the prospective reserves can reach more than 30 billion tons. At present, the on-site utilization rate of high-alumina fly ash is very low, and most enterprises stack the ash randomly, which not only occupies a large amount of space, increases cost...

AI Technical Summary

Problems solved by technology

There are also a large amount of active silanol groups on the outer surface of the white carbon black prepared by this method, and there are polysiloxane groups inside, so that it is hydrophilic, and the affinity and dispersibility of the organic phase are poor, which limits the white carbon black of the present invention. The application fields of carbon black, so it is necessary to control the hydrophobicity of silica to different degrees

[0004] In recent years, a large number of scientific researchers have devoted themselves to finding suitable modifiers for hydrophobic modification of silica. For example, patent 201310123633.7 discloses "a preparation method of hydrophobic silica", which uses a polymer modified emulsifier Hydrophobic modification of white carbon black realizes that white carbon black has good hydrophobic performance and antifoaming performance, but the amount of modifier added is large, and the economic cost is high; patent 201310306588.9 discloses "a kind of hydrophobic white Preparation method of carbon black”; patent 20120056893.2 discloses a “preparation method of superhydrophobic nano-silica film and silica powder”; patent 200610009608.6 discloses a “preparation method of hydrophobic silica”; patent 200610151144.2 Disclosed a "hydrophobic white carbon black and its preparation method"; patent 94193657.0 disclosed a preparation method of "hydrophobic white carbon black"

[0005] Yet, in the preparation method of above-mentioned disclosed hydrophobic silica, all there is certain shortcoming and drawback

Poor adaptability to process application control, small product range and high operating costs

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