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Modified precipitated silicon dioxide and preparation method for modified precipitated silicon dioxide

A precipitated silica and modification technology, applied in the field of modified precipitated silica, can solve the problems of poor dispersion and affecting the application range of rubber

Inactive Publication Date: 2018-12-07
重庆市黔永硅业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the presence of silanol, the precipitated silica has strong polarity and is easy to form agglomerations, resulting in poor dispersion of precipitated silica in the rubber compound, which in turn affects the application range of rubber

Method used

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Examples

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preparation example Construction

[0027] According to one aspect of the present invention, a kind of preparation method of modified precipitated silica, described preparation method comprises the steps:

[0028] First, cationic surfactant is added into the water glass solution, the temperature is raised to obtain solution A, and then sodium sulfate is added into solution A for precipitation reaction. During the reaction process, sulfuric acid solution is used to adjust the pH, and after the reaction is completed, it is aged to obtain modified Precipitated silica.

[0029] The preparation method of the modified precipitated silica provided by the invention comprises firstly adding a cationic surfactant into a water glass solution, raising the temperature to obtain a solution A, then adding sodium sulfate to the solution A to carry out a precipitation reaction, and using a sulfuric acid solution during the reaction The pH is adjusted, and aging is performed after the reaction is completed to obtain modified prec...

Embodiment 1

[0057] The preparation method of the modified precipitated silica provided in this embodiment is as follows:

[0058] (1), adding cetyltrimethylammonium bromide to SiO 2 In the water glass solution with a concentration of 1.8mol / L, the temperature was raised to 80°C at a stirring rate of 200rpm, wherein the amount of cetyltrimethylammonium bromide added was SiO 2 5 wt% of theoretical yield.

[0059] (2), sodium sulfate is added in the mixed solution that step (1) obtains, stirring reaction, utilize sulfuric acid solution to regulate pH in reaction process, wherein, the addition of sodium sulfate is SiO 2 0.5 wt% of theoretical yield.

[0060] (3) Stop the reaction when the pH value of the reaction solution is 4.0, and age for 60 minutes to obtain a modified precipitated silica mixed solution.

[0061] (4), wash the modified precipitated silica mixed solution obtained in step (3), centrifugally filter and separate, and dry in an oven at 120° C., control the moisture content ...

Embodiment 2

[0063] The preparation method of the modified precipitated silica provided in this embodiment is as follows:

[0064] (1), adding cetyltrimethylammonium bromide to SiO 2 In the water glass solution with a concentration of 2.5mol / L, the temperature was raised to 95°C at a stirring rate of 450rpm, wherein the amount of cetyltrimethylammonium bromide added was SiO 2 8 wt% of theoretical yield.

[0065] (2), sodium sulfate is added in the mixed solution that step (1) obtains, stirring reaction, utilize sulfuric acid solution to regulate pH in reaction process, wherein, the addition of sodium sulfate is SiO 2 2.5 wt% of theoretical yield.

[0066] (3) Stop the reaction when the pH value of the reaction solution is 5.5, and age for 120 minutes to obtain a modified precipitated silica mixed solution.

[0067] (4), washing the modified precipitated silica mixture obtained in step (3), centrifuging and separating, drying in an oven at 130°C, controlling the moisture content of the m...

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Abstract

The invention provides a modified precipitated silicon dioxide and a preparation method for the modified precipitated silicon dioxide and relates to the technical field of silicon dioxide preparation.The preparation method for the modified precipitated silicon dioxide comprises the following steps: adding a cationic surface active agent into a sodium silicate solution and rising temperature, thereby acquiring a solution A; adding sodium sulfate into the solution A for precipitation reaction; using a sulfuric acid solution for regulating pH in the reaction process; ageing after the ending of reaction, thereby acquiring the modified precipitated silicon dioxide. According to the invention, the cationic surface active agent is added into the sodium silicate solution, positive charges are carried by the cationic surface active agent after dissolving in water, and then negative charges on the precipitated silicon dioxide surface interact with the positive charges on the surface of the cationic surface active agent, so that a cladding modification effect can be achieved, the stability and dispersity of the precipitated silicon dioxide grains can be promoted and the compatibility of themodified precipitated silicon dioxide and the rubber matrix can be obviously promoted.

Description

technical field [0001] The invention relates to the technical field of silica preparation, in particular to a method for preparing modified precipitated silica and the prepared modified precipitated silica. Background technique [0002] Precipitated silica acts as a reinforcing agent in rubber tires, especially green tires and truck tires. In order to reduce the rolling resistance of tires, reduce heat generation, and improve wear resistance, precipitated silica is essential. With the implementation of the EU labeling law and the increasingly severe environment, the use of precipitated silica in rubber tires is increasing. [0003] Therefore, with the enhancement of modern people's awareness of environmental protection and energy saving, tire manufacturers gradually use precipitated silica instead of carbon black. However, due to the presence of silanol, the precipitated silica has strong polarity and is easy to form agglomerates, resulting in poor dispersion of the precipi...

Claims

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Application Information

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IPC IPC(8): C01B33/12C08K9/04C08K3/36
CPCC01B33/128C01P2006/12C01P2006/19C08K3/36C08K9/04
Inventor 陈洪厚张德兵
Owner 重庆市黔永硅业有限公司
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