High-specific-area white carbon black and production method thereof

A technology of high specific surface area and silica, applied in the direction of silica, inorganic chemistry, non-metallic elements, etc., can solve the problems of low specific surface area of ​​silica, environmental pollution, difficulty in meeting high specification requirements, etc.

Active Publication Date: 2015-11-18
QUECHEN SILICON CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] However, the specific surface area of ​​the white carbon black prepared in the above-mentioned prior art is generally low, and the pore volume distribution is unreasonable, so it is difficult to meet the high specification requirements. In addition, most of the above-mentioned traditional white carbon black production processes are powders obtained by centrifugal drying. shape, it is easy to fly during use, causing environmental pollution

Method used

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  • High-specific-area white carbon black and production method thereof
  • High-specific-area white carbon black and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] SiO 2 / Na 2 The weight ratio of O is 3.35, and liquid sodium silicate and water with a concentration of 1.30mol / l are added to the reaction kettle. The total amount of water and dilute liquid sodium silicate accounts for 44% of the final reaction, and 10% sulfuric acid is added dropwise until the pH is 8.8.

[0060]Add the dilute liquid sodium silicate and sulfuric acid into the synthesis reaction kettle at a certain rate at the same time according to the weight ratio of 0.9:1, and at the same time pass steam into the heating pressure greater than 0.3Mpa, react at a temperature of 75°C for 65min, and maintain the pH of the reaction material 8.5

[0061] Then add sulfuric acid dropwise to adjust the pH to 5.0 and finish the reaction to obtain dilute silica slurry;

[0062] The obtained dilute silica slurry is filtered through a filter press, fed under a pressure of 0.45Mpa for 13 minutes, and then washed under a pressure of 0.65Mpa until the conductivity of the washin...

Embodiment 2

[0074] SiO 2 / Na 2 The weight ratio of O is 3.30, and liquid sodium silicate and water with a concentration of 1.25mol / l are added to the reaction kettle. The total amount of water and dilute liquid sodium silicate accounts for 48% of the final reaction, and 10% sulfuric acid is added dropwise until the pH is 9.0.

[0075] Add the dilute liquid sodium silicate and sulfuric acid into the synthesis reaction kettle at a certain rate at the same time according to the weight ratio of 1.1:1, and at the same time pass through steam to heat the pressure greater than 0.3Mpa, react at a temperature of 80°C for 60min, and maintain the pH of the reaction material 8.4

[0076] Then add sulfuric acid dropwise to adjust the pH to 5.2 and finish the reaction to obtain dilute silica slurry;

[0077] The obtained dilute silica slurry is filtered through a filter press, fed under a pressure of 0.40Mpa for 10 minutes, and then washed under a pressure of 0.56Mpa until the conductivity of the wa...

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Abstract

The invention provides a high-specific-area white carbon black and a production method thereof. The SBET of the white carbon black is 200-450 m<2>/g, the SBET/SCTAB is less than or equal to 1.2, and the total volume of pores with the diameter of 100-30nm is 40% greater than the total volume of pores with the diameter of less than or equal to 50nm when a mercury intrusion process is used for measuring pore size distribution. The high-specific-area white carbon black has high specific area and porous structure, so that the prepared rubber product has the advantages of favorable wear resistance, favorable tensile strength at break and the like.

Description

technical field [0001] The invention belongs to the field of inorganic material production, and relates to a method for producing white carbon black with a high specific surface area, in particular to a method for producing white carbon black with a special structure with a high specific surface area. Background technique [0002] Lake hydrated silica is commonly known as white carbon black, and its molecular formula is SiO 2 .nH 2 O, white carbon black is an important reinforcing material in the rubber industry. Because its microstructure and aggregate shape are similar to carbon black, and it has similar reinforcing properties in rubber, it is called white carbon black. According to its production method, white carbon black can be divided into two categories, namely, precipitated white carbon black and fumed white carbon black. Precipitated silica is used as rubber reinforcing raw material, mainly used in tires, footwear, and other light-colored rubber products. In th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/12B01J20/10
Inventor 王永庆
Owner QUECHEN SILICON CHEM
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