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A kind of rapid preparation method of silica modified with silane coupling agent

A technology of silane coupling agent and white carbon black, which is applied in the treatment of dyed organosilicon compounds, fibrous fillers, etc., can solve the problems of large amount of coupling agent, long processing time, harsh conditions, etc., and achieve a small number of equipment and production Fast speed, no pollution effect

Active Publication Date: 2020-04-17
枣庄矿业(集团)有限责任公司蒋庄煤矿
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the modified silica obtained by this method is evenly dispersed, the process is complicated, the conditions are harsh, the amount of coupling agent is large, and the treatment time is long. When the amount of coupling agent is greater than 8%, it needs to be used together with surfactants.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0026] A kind of quick preparation method with silane coupling agent modified white carbon black, comprises the steps:

[0027] S1, chemical material, dissolving water glass in hot water, the density of the aqueous solution of water glass is 1.1~1.5g / cm 3 ;

[0028] S2, pretreatment, the water glass solution obtained in S1 is precipitated, filtered and then moved into the overhead tank;

[0029] These two steps are to dissolve the solid water glass into a liquid, and then filter twice to obtain liquid water glass. During the debugging process, the concentration and density are tested in the laboratory, and then water or water glass is added according to the required concentration and density. .

[0030] S3, white carbon black is synthesized, injects the water glass and the concentrated sulfuric acid that obtain in S2 into reactor simultaneously, the flow ratio of concentrated sulfuric acid and water glass is 1: 10~20;

[0031] S4, white carbon black pressure filtration wash...

Embodiment 1

[0043] S1, chemical material, water glass is dissolved in hot water, the aqueous solution density of described water glass is 1.1g / cm 3 ;

[0044]S2, pretreatment, the water glass solution obtained in S1 is precipitated, filtered and then moved into the overhead tank;

[0045] S3, white carbon black are synthesized, inject the water glass and the vitriol oil that obtain in S2 into reactor simultaneously, the flow ratio of vitriol oil and water glass is 1: 10;

[0046] S4, white carbon black pressure filtration washing, the mixture obtained in S3 is subjected to pressure filtration washing, and the temperature of the washing water used is 35 o C. Monitor the conductivity of the washing water during the washing process until the conductivity of the washing water is less than 4.0 mS / cm;

[0047] S5, filter cake beating: the filter cake obtained in S4 is transported to the beating tank with a belt, and water is added for beating, and the mass ratio of filter cake to water is 4:1...

Embodiment 2

[0051] S1, chemical material, water glass is dissolved in hot water, the aqueous solution density of described water glass is 1.5g / cm 3 ;

[0052] S2, pretreatment, the water glass solution obtained in S1 is precipitated, filtered and then moved into the overhead tank;

[0053] S3, white carbon black is synthesized, injects the water glass and the vitriol oil that obtain in S2 simultaneously in reactor, the flow ratio of vitriol oil and water glass is 1: 20;

[0054] S4, white carbon black pressure filtration washing, the mixture obtained in S3 is subjected to pressure filtration washing, and the temperature of the washing water used is 45 o C. Monitor the conductivity of the washing water during the washing process until the conductivity of the washing water is less than 4.0 mS / cm;

[0055] S5, filter cake beating: the filter cake obtained in S4 is transported to the beating tank with a belt, and water is added for beating, and the mass ratio of filter cake to water is 1.2:...

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Abstract

The invention discloses a quick preparation method of using a silane coupling agent for modifying white carbon black. The method includes the steps of: 1) dissolving sodium silicate in hot water, performing pretreatment, and injecting the sodium silicate solution and concentrated sulfuric acid into a reaction kettle to synthesize white carbon black; 2) performing press filtration and washing to the white carbon black, pulping a filter cake, performing modification, and drying and separating a product. In the method, the silane coupling agent is added before the drying step during the production of the white carbon black just by adding a silane coupling agent solution into a pulping tank in a spraying manner during the stirring and pulping step, so that the method is more energy-saving andhas simpler process. The method is lower in cost since employed devices are fewer than that in other processes. In the method, water is generally employed as a solvent and only a less amount of ethanol is employed, so that the method is safer to operators, and basically has no environment pollution. The method is quick in production, employs easy-to-obtained raw materials and is energy-saving andenvironment-friendly.

Description

technical field [0001] The invention relates to the technical field of modified white carbon black, in particular to a rapid preparation method for modifying white carbon black with a silane coupling agent. Background technique [0002] White carbon black, also known as hydrated silica, has a very broad application prospect because of its small particle size, large specific surface area, high temperature resistance and stable chemical properties, etc. The field plays its unique role. At present, the conventional production methods of white carbon black mainly include gas phase method and precipitation method. Precipitation method, white carbon black is generally prepared by the neutralization and precipitation reaction of sodium silicate and sulfuric acid. After the precipitation of hydrated silica, according to the requirements of the finished product, After filtering and washing in a roller filter press or a plate filter press to remove excess water and reaction by-produc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09C1/56C09C3/12
Inventor 李启坤李莉张琪华超靳伟强田清郭晶晶胡东常欣
Owner 枣庄矿业(集团)有限责任公司蒋庄煤矿
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