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Preparation method for hydrophobic high-dispersion white carbon black

A high-dispersion silica, hydrophobic technology, applied in the direction of silica, silicon oxide, etc., can solve the problem of reducing the hydroxyl content of silica and hydrophilicity, poor compatibility between silica and rubber macromolecules, and macromolecules. Poor compatibility and other problems, to achieve the effects of enhanced wettability, improved wear resistance, and improved lipophilicity

Inactive Publication Date: 2015-11-18
CHANGZHOU UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved in the present invention is to provide a method for highly hydrophobic and highly dispersed silica, aiming at the disadvantages of the presence of a large amount of silicon hydroxyl groups on the surface of silica, resulting in poor compatibility between silica and rubber macromolecules, and easy agglomeration. The method can reduce the hydroxyl content and hydrophilicity of white carbon black, solve the problem of poor compatibility between white carbon black and rubber macromolecules, and has simple preparation process, good product stability and good technical economy

Method used

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  • Preparation method for hydrophobic high-dispersion white carbon black
  • Preparation method for hydrophobic high-dispersion white carbon black

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] The concentration of sulfuric acid is 2.5mol / L, the modulus of water glass is 3.3, SiO 2 The molar concentration is 1.34mol / L. Pipette 912mL of water glass solution, add it into a 2L stirred reaction kettle, stir (rotate at 250rpm) and heat up to 90°C. Add above-mentioned sulfuric acid solution dropwise with 210min, make pH value be reduced to 3.5, after adding acid, continue to add silane coupling agent KH570 alcohol aqueous solution (silane coupling agent KH570 volume percent consumption is 1.5% of total volume of reaction solution, V 硅烷偶联剂KH570 =13.7mL) for modification reaction, the modification time is 90min, filtered, washed with deionized water and desalted. Wash until the conductivity of the water is less than or equal to 100 μs / cm, and dry in an oven at 105°C until the moisture content of the product is 6.2 wt%, to obtain a hydrophobic and highly dispersed precipitated white carbon black powder product.

Embodiment 2

[0016] Pipette 912mL of the same water glass solution as in Example 1, add it into a 2L stirred reactor, stir (rotate at 250rpm) and heat up to 85°C. Add 2.5mol / L sulfuric acid solution dropwise over 180min to reduce the pH value to 4.5. After adding the acid, continue to add the silane coupling agent KH570 alcohol aqueous solution (the volume percentage of the silane coupling agent KH570 is 1.5% of the total volume of the reaction solution, V 硅烷偶联剂KH570 =13.7mL) for modification reaction, the modification time is 90min, filtered, washed with deionized water and desalted. Wash until the conductivity of the water is less than or equal to 100 μs / cm, and dry in an oven at 105°C until the moisture content of the product is 5.8 wt%, to obtain a hydrophobic and highly dispersed precipitated white carbon black powder product.

Embodiment 3

[0018] Pipette 912mL of the same water glass solution as in Example 1, add it into a 2L stirred reactor, and stir (rotate at 250rpm) to raise the temperature to 80°C. Add 2.5mol / L sulfuric acid solution dropwise over 150min to reduce the pH value to 6. After adding the acid, continue to add the silane coupling agent KH570 alcohol aqueous solution (the volume percentage of the silane coupling agent KH570 is 1.5% of the total volume of the reaction solution, V 硅烷偶联剂KH570 =13.7mL) for modification reaction, the modification time is 90min, filtered, washed with deionized water and desalted. Wash until the conductivity of the water is less than or equal to 100 μs / cm, and dry in an oven at 105°C until the moisture content of the product is 5.8 wt%, to obtain a hydrophobic and highly dispersed precipitated white carbon black powder product.

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Abstract

The invention relates to a preparation method for hydrophobic high-dispersion white carbon black. According to the method, the hydrophobic high-dispersion white carbon black is prepared by taking sodium silicate and sulfuric acid as raw materials and using a silane coupling agent KH570 to modify through a precipitation method. The modulus of the sodium silicate in the method is 3.2-3.5, and the concentration of SiO2 in the sodium silicate is 0.67-2.01mol / L. The concentration of dilute sulphuric acid is 1.5-3.5 mol / L. The precipitation reaction temperature is 80-90 DEG C, and the pH value is 3.5-9. Dosage of a modifier accounts for 0.1-3% of the total volume of a reaction liquid, and the modifying reaction time is 30-150 minutes. Finally, the product is washed, filtered and dried. According to the preparation method, the hydrophobicity and the dispersion of conventional white carbon black are improved; the problems that white carbon black in a conventional precipitation method has many silanol groups on surface, and is liable to unite, poor in structure, poor in compatibility with rubber and low in reinforcing property are solved. Moreover, the process is simple, the product stability is good and the technological economy is good.

Description

technical field [0001] The invention relates to the field of preparation of inorganic fillers, in particular to a preparation method of hydrophobic highly dispersed white carbon black. Background technique [0002] As a widely used inorganic filler, precipitated silica has the advantages of low price, large filling capacity and good processing performance. Compared with carbon black tread rubber, the frictional resistance of white carbon black tread rubber is reduced by about 20%, which is beneficial to energy saving and environmental protection, and has important practical significance and industrial value for the development of tire rubber industry. Therefore, with the enhancement of modern people's awareness of environmental protection and energy saving, tire manufacturers gradually use white carbon black to replace carbon black. [0003] However, the existing problem of white carbon black is that there are a large amount of silicon hydroxyl groups on the surface, so the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/12
Inventor 郭登峰王明贺陈南飞卢爱平宋文娟邹平
Owner CHANGZHOU UNIV
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