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Preparation method of modified precipitating method white carbon black

A technology for precipitation and modification of white carbon black, which is applied in the field of rubber reinforcing agents, can solve the problems of general and unsatisfactory performance of white carbon black, and achieve improved vulcanization efficiency and reinforcing performance, improved physical properties, and improved dispersibility Effect

Inactive Publication Date: 2018-05-15
安徽凤阳赛吉元无机材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the increasing attention to the environmental protection and energy-saving performance of tires, the application of silica will be more extensive, but the performance of silica prepared by the existing method is average, which cannot meet the needs of some occasions in the market

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A preparation method of modified precipitation white carbon black, comprising the following steps:

[0020] (1) Add liquid sodium silicate to the reaction kettle, add 0.15% of its mass nano-silica to the liquid sodium silicate, and stir at 500r / min for 2 hours;

[0021] (2) Add sulfuric acid aqueous solution in an equimolar amount to liquid sodium silicate in the reaction kettle, the mass fraction of the sulfuric acid aqueous solution is 40%, stir at 250r / min for 15min, then add 0.32% surface isocyanate of liquid sodium silicate The softened bentonite was slowly heated to 88°C and stirred for 2.5 hours at a speed of 200r / min;

[0022] (3) Use ammonia water to adjust the pH value to 8.5, stir at 120r / min for 15min, then add a sedimentation agent with a mass of 0.2% of liquid sodium silicate, and continue stirring for 1.5 hours;

[0023] (4) After the reaction is finished, the reactant is washed with water, suction filtered, and dried to obtain modified precipitated sili...

Embodiment 2

[0032] A preparation method of modified precipitation white carbon black, comprising the following steps:

[0033] (1) Add liquid sodium silicate to the reaction kettle, add 0.18% of its mass nano-silica to the liquid sodium silicate, and stir at 500r / min for 2 hours;

[0034] (2) Add an aqueous sulfuric acid solution in an equimolar amount to the liquid sodium silicate in the reaction kettle, the mass fraction of the sulfuric acid aqueous solution is 42%, stir at a speed of 250r / min for 18min, then add 0.35% surface isocyanate of the liquid sodium silicate The softened bentonite was slowly heated to 92°C and stirred for 3 hours at a speed of 200r / min;

[0035] (3) Use ammonia water to adjust the pH value to 8.8, stir at 120r / min for 15min, then add a sedimentation agent with a mass of 0.5% of liquid sodium silicate, and continue stirring for 1.5 hours;

[0036] (4) After the reaction is finished, the reactant is washed with water, suction filtered, and dried to obtain modifi...

Embodiment 3

[0045] A preparation method of modified precipitation white carbon black, comprising the following steps:

[0046] (1) Add liquid sodium silicate to the reaction kettle, add 0.16% of its mass nano-silica to the liquid sodium silicate, and stir at 500r / min for 2 hours;

[0047] (2) Add an aqueous sulfuric acid solution in an equimolar amount to the liquid sodium silicate in the reaction kettle, the mass fraction of the sulfuric acid aqueous solution is 41%, stir at 250r / min for 16min, then add 0.34% surface isocyanate of the liquid sodium silicate The softened bentonite was slowly heated to 89°C and stirred for 2.8 hours at a speed of 200r / min;

[0048] (3) Use ammonia water to adjust the pH value to 8.6, stir at 120r / min for 15min, then add a sedimentation agent with a mass of 0.3% of liquid sodium silicate, and continue stirring for 1.5 hours;

[0049] (4) After the reaction is finished, the reactant is washed with water, suction filtered, and dried to obtain modified precip...

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Abstract

The invention discloses a preparation method of modified precipitating method white carbon black, and relates to the technical field of rubber strengthening agents. The preparation method comprises the following steps: (1) adding liquid sodium silicate into a reaction kettle, and adding nano-silicon dioxide with the mass of 0.15 to 0.18 percent of that of the liquid sodium silicate into the liquidsodium silicate; (2) adding a sulphuric acid aqueous solution into the reaction kettle, and adding bentonite of which the surface is subjected to isocyanate esterification; (3) regulating the pH value by adopting ammonium hydroxide, adding a settling agent, and continuously stirring; (4) after the reaction is ended, performing water washing and suction filtering on a reactant, and drying to obtain the modified precipitating method white carbon black. Compared with the conventional precipitating method white carbon black, the physical and chemical indicators (the BET specific surface area, theoil absorption value, the particle size and the like) of the modified white carbon black prepared by the preparation method are all improved by over 10 percent, and the yield is 95 percent.

Description

technical field [0001] The invention belongs to the technical field of rubber reinforcing agents, and in particular relates to a preparation method of modified precipitation white carbon black. Background technique [0002] Precipitated silica, also known as hydrated silica, is a white, non-toxic, amorphous fine powder. It has excellent properties such as porosity, large internal surface area, light weight, good chemical stability, high temperature resistance, non-combustion, and good electrical insulation. It is widely used in rubber, coatings and other fields. Among them, the rubber industry is the main consumption market of silica, accounting for more than 70% of the total consumption of silica. In the rubber industry, white carbon black is an excellent rubber reinforcing agent, which can improve bonding and tear resistance. Partial replacement of carbon black can also reduce tire heat generation, rolling resistance and fuel consumption, and at the same time improve the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/12
CPCC01B33/12C01P2006/12C01P2006/19
Inventor 陆幼强牛虎辰吴君苏海波
Owner 安徽凤阳赛吉元无机材料有限公司
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