Method for preparing hydrophobic white carbon black

A technology of hydrophobic silica and precipitation silica, applied in the direction of fibrous fillers, dyed low-molecular-weight organic compounds, etc., can solve the problems of increased modification cost, complicated modification process, environmental pollution, etc., and achieves clean solvent free. The effect of pollution, simple operation process and improved hydrophobicity

Inactive Publication Date: 2013-10-23
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the surface modification of silica is mainly carried out by adding coupling agents, long-carbon chain alcohols or polymers. The degree of hydrophobicity of the modified silica has been improved to a certain extent, but the modification process is relatively complicated. The process requires the use of a large amount of organic solvents, which increases the cost of modification, complicates the post-processing of the product, and easily causes certain environmental pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Accurately weigh 0.09g of cetyltrimethylammonium bromide (CTAB) and dissolve it in 90mL of deionized water to obtain a modifier solution, then add 6g of precipitated white carbon black to the above modifier solution to adjust the pH value of the system 8. Stir magnetically in a constant temperature water bath at 50°C for 30 minutes at a speed of 350 rpm. After filtration and drying, hydrophobic silica is obtained. The activation degree is 99.21%.

Embodiment 2

[0030] Accurately weigh 0.18g of cetyltrimethylammonium chloride (CTAC) and dissolve it in 100mL of deionized water to obtain a modifier solution, then add 9g of precipitated white carbon black to the above modifier solution to adjust the pH value of the system 8, magnetically stirred in a constant temperature water bath at 60°C for 40 minutes at a speed of 300 rpm, filtered and dried to obtain hydrophobic silica, and its activation degree was detected to be 99.80%.

Embodiment 3

[0032] Accurately weigh 0.75g of dodecyltrimethylammonium chloride (DTAC) and dissolve it in 135mL of deionized water to obtain a modifier solution, then add 15g of precipitated white carbon black to the above modifier solution to adjust the pH value of the system 8. Stir magnetically in a constant temperature water bath at 75°C for 70 minutes at a speed of 450 rpm. After filtration and drying, hydrophobic silica is obtained. The activation degree is 98.78%.

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Abstract

The invention discloses a method for preparing hydrophobic white carbon black. The method comprises the steps of drying precipitated white carbon black to constant weight, then mixing with a modifier solution, adjusting a pH value to 8; and at a temperature of 30-90 DEG C, stirring for a reaction for 20-100 min with a stirring speed of 250-450 rpm, then filtering, and drying to obtain the hydrophobic white carbon black. The modifier is selected from one or more of cetyltrimethylammonium chloride, hexadecyltrimethylammonium bromide, dodecyltrimethylammonium chloride, and dodecyltrimethylammonium bromide. The activation degree of the modified white carbon black is obviously improved and can reach 95% or more, and the modified white carbon black is the hydrophobic white carbon black. The method of the invention is simple in process, has the solvent with cleanliness and no pollution; and the modified white carbon black has the hydrophobic property improved significantly, and thereby being beneficial to improving compatibility when adding into rubber and plastics.

Description

1. Technical field [0001] The invention relates to a preparation method of white carbon black, in particular to a preparation method of hydrophobic white carbon black. 2. Background technology [0002] Silica is hydrated silicon dioxide (SiO 2 ·nH 2 O), is a white, non-toxic, amorphous fine powder, with excellent properties such as light weight, good chemical stability, porosity, high temperature resistance, non-combustibility, and good electrical insulation. Silica is mainly used in the rubber industry. It improves the tear resistance and bonding of rubber with its excellent reinforcing properties, and its performance is obviously better than that of ordinary carbon black. In addition, white carbon black can also be used as a filler in chemical products such as coatings, plastics, paints, inks, etc., and its application fields are constantly expanding. [0003] The preparation methods of white carbon black mainly include precipitation method and gas phase method, among w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/28C09C3/08
Inventor 王百年何晓婷杨保俊刘磊谢慷慨
Owner HEFEI UNIV OF TECH
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