Preparation method of hydrophobic high-reinforcing white carbon black

A technology of silica and hydrophobicity, which is applied in the field of preparation of highly hydrophobic and highly reinforcing silica, can solve the problems affecting the comprehensive mechanical properties of vulcanized rubber, poor compatibility and dispersion, and poor reinforcement of silica. Achieve the effects of enhanced wettability, enhanced hydrophobicity, and improved reinforcement performance

Inactive Publication Date: 2017-11-10
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are a large number of hydrophilic silanol groups on the surface of silica, which is easy to absorb water and aggregate, resulting in poor compatibility and dispersion in the polymer matrix, which greatly affects the comprehensive mechanical properties of vulcanized rubber and makes the reinforcement of silica poor.

Method used

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  • Preparation method of hydrophobic high-reinforcing white carbon black
  • Preparation method of hydrophobic high-reinforcing white carbon black
  • Preparation method of hydrophobic high-reinforcing white carbon black

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Pipette 460g SiO 2 Add the wet gel into a 2L reaction kettle, stir (250rpm) and heat up to 80°C, add 2.5mol / L dilute sulfuric acid dropwise to lower the pH of the reaction solution to 2.5, after adding the acid, add silane coupling agent A171 mass 12.0g for modification reaction, the modification time is 60min, washed with distilled water and suction filtered until the conductivity of the washing liquid is lower than 100μS / cm, dried in an oven at 105°C until the moisture content of the product is 5.2wt%, high hydrophobicity Reinforces precipitated silica.

Embodiment 2

[0036] Pipette 460g SiO 2 Add the wet gel into a 2L stirred reactor, stir (250rpm) and heat up to 85°C, add 2.5mol / L dilute sulfuric acid dropwise to lower the pH of the reaction solution to 2.5, after adding the acid, add the silane coupling agent A171 The mass of 12.0g was subjected to modification reaction, the modification time was 150min, washed with distilled water and suction filtered until the conductivity of the washing liquid was lower than 100μS / cm, dried in an oven at 105°C until the product had a moisture content of 5.2wt%, and obtained hydrophobicity Highly reinforcing precipitated silica.

Embodiment 3

[0038] Pipette 460g SiO 2 Add the wet gel into a 2L stirred reactor, stir (250rpm) and heat up to 90°C, add 2.5mol / L dilute sulfuric acid dropwise to reduce the pH of the reaction solution to 2.5, after adding the acid, add the silane coupling agent A171 The mass of 12.0g was subjected to modification reaction, the modification time was 120min, washed with distilled water and suction filtered until the conductivity of the washing liquid was lower than 100μS / cm, dried in an oven at 105°C until the product had a moisture content of 5.2wt%, and obtained hydrophobicity Highly reinforcing precipitated silica.

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Abstract

The invention relates to a preparation method of hydrophobic high-reinforcing white carbon black. According to the preparation method, a SiO2 wet gel is used as a raw material and A171 is used as a modifier to prepare the hydrophobic high-reinforcing white carbon black; and the modification temperature is 80-95 DEG C, the modification time is 60-150 min, the pH value of the modification solution is 2.2-3.1, and the use amount of the modifier is 2.2-3.4% of the total mass of the reaction solution. According to the present invention, the problems that the traditional white carbon black has many silanol groups on the surface and has poor compatibility with rubbers are solved through the white carbon black of the present invention, and the hydrophobicity of the traditional white carbon black is improved; with the application of the white carbon black of the present invention in the styrene-butadiene rubber, the processing performance of the rubber is improved, the vulcanization time of the rubber is reduced, the wear resistance, the tensile strength, the tensile stress at a given elongation, and other mechanical properties of the vulcanized rubber are improved, and the reinforcing property of the traditional white carbon black is improved; and the preparation method has advantages of simple process, good product stability, easy industrialization, and good technical economy.

Description

technical field [0001] The invention relates to the technical field of white carbon black modification, in particular to a method for preparing hydrophobic high-reinforcing white carbon black. Background technique [0002] White carbon black is nano silicon dioxide, the molecular formula is: SiO 2 ·nH 2 O, because its microstructure and aggregated form are similar to carbon black, and has similar reinforcing properties in rubber, it is called white carbon black. It has the advantages of low price, energy saving and environmental protection, good processing performance and the like. Applying silica to the tire tread can reduce the rolling resistance of the tire by about 30%, while maintaining good wet skid resistance and wear resistance. Therefore, in recent years, tire manufacturers have gradually used silica to replace carbon black. However, there are a large number of hydrophilic silanol groups on the surface of silica, which is easy to absorb water and aggregate, resu...

Claims

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Application Information

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IPC IPC(8): C08K9/06C08K9/04C08K3/36C08L9/06
CPCC08K9/06C08K3/36C08K9/04C08L9/06
Inventor 郭登峰高中飞陈南飞宋文娟钱婷婷卢爱平
Owner CHANGZHOU UNIV
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