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Method for preparing high-quality nano-grade white carbon black by using sulfuric acid precipitation method

A sulfuric acid precipitation method, a nano-scale technology, applied in the fields of nanotechnology, nanotechnology, nanotechnology, etc. for materials and surface science, which can solve the problem that the BET specific surface area and particle size distribution have a great influence, and polyethylene di Alcohol product particle size distribution, different problems, etc.

Inactive Publication Date: 2013-02-06
ANHUI SCI & TECH UNIV
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent CN 102092721 A discloses a method for preparing nano-scale silica by sulfuric acid precipitation, which is an innovation of traditional silica production technology, but the patent does not disclose or disclose the effect of polyethylene glycol on the production of silica by sulfuric acid. The inhibition of self-aggregation behavior between primary particles and the influence of product particle size distribution, etc., for this reason, on the basis of in-depth research on the production technology and laws of polyethylene glycol for the preparation of nano-silica, it was found that the average molecular weight of polyethylene glycol is different (The degree of polymerization is different), not only the types are different, but also its performance in many aspects is quite different, such as water solubility, the size of micellar particles, dispersibility, emulsion stability, etc., for the production of nano-scale silica by sulfuric acid method The BET specific surface area and particle size distribution of the product have a great influence, so choosing a suitable average molecular weight polyethylene glycol is of great significance for the production of high-quality nano-scale silica

Method used

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  • Method for preparing high-quality nano-grade white carbon black by using sulfuric acid precipitation method

Examples

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Embodiment 1

[0030] Add 5g PEG-400 and 20mL industrial ethanol with a concentration of 95% to 1000mL of 5% sodium silicate solution, stir well to obtain a mixed solution, slowly add dilute sulfuric acid with a concentration of 40% to the obtained mixed solution and Stir at a speed of 180 rpm until the pH of the reaction system = 4 to obtain a precipitate, then age the obtained precipitate at 60°C for 3 hours and press filter, and filter the filter cake obtained by deionized water After washing for 3 times, the washed filter cake was dried at 140°C for 2 hours and ground to obtain 32.8g of white carbon black with a BET specific surface area of ​​310.8m 2 / g, 95% of the particle size distribution interval is 40~80nm.

Embodiment 2

[0032] Add 5g PEG-1000 and 50mL acetone to 1000mL sodium silicate solution with a concentration of 5%, stir well to obtain a mixed solution, slowly add dilute sulfuric acid with a concentration of 20% to the obtained mixed solution at a speed of 120 rpm Stir until the pH of the reaction system = 9 to obtain a precipitate, then age the obtained precipitate at 70°C for 2 hours and press filter, and wash the filter cake obtained by the press filter three times with deionized water, after washing The filter cake was then dried at 110°C for 2 hours, and then ground to obtain 31.4g of nano-scale silica, with a BET specific surface area of ​​360m 2 / g, 95% of the particle size distribution interval is 50~80nm.

Embodiment 3

[0034]Add 20g PEG-2000 and 100mL industrial ethanol with a concentration of 95% to 1000mL sodium silicate solution with a concentration of 10%, stir well to obtain a mixed solution, slowly add dilute sulfuric acid with a concentration of 30% to the obtained mixed solution and Stir at a speed of 200 rpm until the pH of the reaction system = 7 to obtain a precipitate, then age the obtained precipitate at 85°C for 1 hour and press filter, and filter the filter cake obtained by deionized water After washing 5 times, the washed filter cake was dried at 130°C for 3 hours and ground to obtain 64.3g of nano-scale white carbon black, with a BET specific surface area of ​​390.2m 2 / g, 95% of the particle size distribution interval is 55~75nm.

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Abstract

The invention provides a method for preparing high-quality nano-grade white carbon black by using a sulfuric acid precipitation method, which relates to preparation of white carbon black in the field of chemical industry. According to the method, the high-quality nano-grade white carbon black is prepared by regulating and controlling the hydrolysis rate of silicate and the polymerization degree of silicic acid molecules in a way of taking sodium silicate as a raw material, taking sulfuric acid as a precipitant and taking PEG (Polyethylene Glycol) of which the average molecular weight is 400-3,000 as a surfactant as well as a dispersion aid. The method has the advantages of simple production process and low cost, and the produced nano-grade white carbon black has high quality.

Description

Technical field: [0001] The invention relates to the preparation of white carbon black in the chemical industry, in particular to a method for preparing high-quality nano-scale white carbon black by using a sulfuric acid precipitation method. Background technique: [0002] Silica is an amorphous light silica powder material, which has a large specific surface area, good electrical insulation, dispersion, porosity and adsorption properties, and at the same time has good reinforcement, Thickening effect, widely used in many industries such as rubber, plastics, coatings, medicine, electronics, daily chemicals and catalysts. [0003] The preparation methods of white carbon black can be divided into two categories: physical method and chemical method. Impurities are easily introduced during the physical production process, and the particle size of the product is mostly hundreds or tens of microns, which is not high-grade and difficult to meet industrial needs. Therefore, the whi...

Claims

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Application Information

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IPC IPC(8): C01B33/12B82Y30/00
Inventor 陈君华刘宁郭雨程年寿郭腾章毛连周丽杨万科
Owner ANHUI SCI & TECH UNIV