Production method for white carbon black with high additive amount

A production method and additive technology, applied in the direction of silica, silicon oxide, etc., can solve the problem of large specific surface area, and achieve the effect of small specific surface area, fast mixing time, and easy control of the process

Active Publication Date: 2015-01-21
江西双龙硅材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing production method of precipitated silica generally uses liquid water glass and concentrated sulfuric acid as raw materials, and is prepared through precipitation reaction, press filtration, pulping, and spray drying. Strong, the specific surface area of ​​the particles i

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The production method of high dosage silica:

[0016] 1. Refined water glass

[0017] Take 40m3 water glass dissolved by steam, configure it into water glass with a specific gravity of 1.080g / cm3, filter through plate and frame, and take the clear liquid for later use.

[0018] 2. Synthesis of silica

[0019] Add 15m3 base material into a 55m3 reaction kettle, add sodium sulfate of the same quality at the same time, pass in steam to raise the temperature, start stirring when the temperature rises to 50°C, continue to heat up, start adding sulfuric acid dropwise when the temperature reaches 87°C, sulfuric acid per hour Add 0.17m3 dropwise, react until the pH value is between 10-11, start the second stage reaction, add water glass and sulfuric acid dropwise at the same time, add 18m3 dropwise to water glass per hour, add 0.37m3 dropwise to sulfuric acid per hour, and react until the pH value is 10 Stop dripping between -11, start the three-stage reaction, add sulfuric a...

Embodiment 2

[0027] The production method of high dosage silica:

[0028] 1. Refined water glass

[0029] Take 50m3 of water glass dissolved by steam, configure it into water glass with a specific gravity of 1.085g / cm3, filter it through a plate and frame, and take the clear liquid for later use.

[0030] 2. Synthesis of silica

[0031] Add 12m3 base material into a 55m3 reaction kettle, add sodium sulfate of the same quality at the same time, feed steam to raise the temperature, start stirring when the temperature rises to 45°C, continue to heat up, and start adding sulfuric acid dropwise when the temperature reaches 88°C, sulfuric acid per hour Add 0.15m3 dropwise, react until the pH value is between 10-11, start the second stage reaction, add water glass and sulfuric acid dropwise at the same time, add 17.5m3 dropwise to water glass per hour, add 0.39m3 dropwise to sulfuric acid per hour, and react until the pH value is between Stop dripping between 10-11, start the three-stage reacti...

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Abstract

The invention relates to a production method for an inorganic powder material, in particular to a production method for white carbon black with high additive amount applied to high-elastic silicone rubber. The production method comprises the processes of dissolution and refining of water glass, synthesis reaction of the water glass and dilute sulphuric acid, pressure filtration, washing, pulping and drying; the reaction of the water glass and the dilute sulphuric acid comprises the following three steps: generating seed crystal, conducting synthesis reaction and adjusting integral pH value. According to the invention, the synthesis process of three steps is adopted; the specific surface area of the product is reduced by adding a sodium sulfate additive; reaction conditions are controlled strictly; the particle diameter of secondary particles of the product is controlled effectively; the characteristics of small specific surface area, low oil absorption value, high additive amount, high reinforcing performance and short mixing time during mixing with silicone rubber are provided; the raw materials are easy to obtain; the process is easy to control; no extra equipment is needed; the production can be conducted on an original production line.

Description

technical field [0001] The invention relates to a production method of an inorganic powder material, in particular to a production method of high-addition white carbon black applied to high-elastic silicone rubber. Background technique [0002] Precipitated silica is a widely used inorganic functional powder material, mainly used in ordinary rubber, silicone rubber, coatings, inks, pesticides, papermaking and other fields. The production method of silica for high elastic silicone rubber is mainly precipitation method. The existing production method of precipitated silica generally uses liquid water glass and concentrated sulfuric acid as raw materials, and is prepared through precipitation reaction, press filtration, pulping, and spray drying. Strong, the specific surface area of ​​the particles is large, so it is rarely used in high-elastic silicone rubber. With the upgrading of silicone rubber products, the demand for high-elastic silicone rubber increases. High addition ...

Claims

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Application Information

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IPC IPC(8): C01B33/12
Inventor 石清源
Owner 江西双龙硅材料科技有限公司
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