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

A high-alumina fly ash, hydrophobic technology, applied in the direction of silicon dioxide, silicon oxide, etc., can solve the problems of small product range, high operating cost, high economic cost, inhibiting premature agglomeration, increasing specific surface area, widening Effects in the field of application

Active Publication Date: 2015-11-04
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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

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Experimental program
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Effect test

Embodiment 1

[0021] (1) Using high-alumina fly ash as raw material, the content of alumina is 40-50%, and the desilication solution is obtained by carrying out alkali-soluble desiliconization reaction between high-alumina fly ash and alkali solution; the concentration of alkali solution is 80g / L , the solid content of fly ash is 40wt%. Heat the mixed material to 85°C, react at this temperature for 90min, and obtain a desiliconization solution with a modulus of 0.4 through refining, filtration and separation;

[0022] (2) Pressure mould-lifting of fly ash alkali-soluble desiliconization solution: put the fly ash alkali-soluble desiliconization solution in a pressure reactor for mold-lifting reaction, and obtain a mold-lifting desiliconization solution with a modulus within the range of 2.5;

[0023] (3) Preparation of reaction solution: add purified water to the desiliconization solution prepared in step (2), that is, water with conductivity ≤ 10us / cm, and prepare Na 2 An aqueous solution w...

Embodiment 2

[0028] (1) Using high-alumina fly ash as raw material, the content of alumina is 40-50%, and the desilication solution is obtained by carrying out alkali-soluble desiliconization reaction between high-alumina fly ash and alkali solution; the concentration of alkali solution is 120g / L , the solid content of fly ash is 30wt%. Heat the mixed material to 120°C, react at this temperature for 55min, and obtain a desiliconization solution with a modulus of 1.2 after refining, filtration and separation;

[0029] (2) Pressure mould-lifting of fly ash alkali-soluble desiliconization solution: put the fly ash alkali-soluble desiliconization solution in a pressure reactor for mold-lifting reaction, and obtain a mold-lifting desiliconization solution with a modulus within the range of 2.7;

[0030] (3) Preparation of reaction solution: add purified water to the desiliconization solution prepared in step (2), that is, water with conductivity ≤ 10us / cm, and prepare Na 2 An aqueous solution w...

Embodiment 3

[0035] (1) Using high-alumina fly ash as raw material, the content of alumina is 40-50%, and the desilication solution is obtained by carrying out alkali-soluble desiliconization reaction between high-alumina fly ash and alkali solution; the concentration of alkali solution is 100g / L , the solid content of fly ash is 30wt%. Heat the mixed material to 110°C, react at this temperature for 30min, and obtain a desiliconization solution with a modulus of 0.8 after refining, filtration and separation;

[0036] (2) Pressure mould-lifting of fly ash alkali-soluble desiliconization liquid: put the fly ash alkali-soluble desiliconization liquid in a pressure reactor for mold lifting reaction, and obtain a mould-lifting desiliconization liquid with a modulus within the range of 2.3;

[0037] (3) Preparation of reaction solution: add purified water to the desiliconization solution prepared in step (2), that is, water with conductivity ≤ 10us / cm, and prepare Na 2 An aqueous solution with a...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/12
Inventor 李会泉马艳丽贺建平
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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