Method for preparing white carbon black by utilizing waste silicon rubber cracked residues

A white carbon black and residue technology, applied in the field of white carbon black preparation, can solve the problems of narrow application range of recycled products, poor product color, large ash particle size, etc., to avoid secondary pollution, narrow particle size distribution, good whiteness effect

Inactive Publication Date: 2012-06-13
江山市华顺有机硅有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above-mentioned process technologies all have shortcomings such as the recovered product contains residual silane oil, the product has poor color, the ash particle size is large and the distribution is wide and uneven, and the application range of the recovered product is narrow.

Method used

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  • Method for preparing white carbon black by utilizing waste silicon rubber cracked residues
  • Method for preparing white carbon black by utilizing waste silicon rubber cracked residues

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Embodiment 1

[0025] Example 1: 70g of the pyrolysis residue was crushed and sieved to 200 mesh, and calcined in a muffle furnace at 700-900°C for more than 2 hours to obtain 42g of white ash, the ash containing 76% silica mass fraction , respectively add 42g of calcined ash to the alkali-dissolved reaction kettle, add 7.09g of solid sodium hydroxide according to the molar ratio of silicon dioxide and solid sodium hydroxide in the ash to 3:1, and add 7.09g of solid sodium hydroxide according to the solid-to-liquid volume ratio of 1:2.2 Add 170ml of deionized water, carry out normal pressure reaction at 90°C for 5-7 hours, filter after the reaction, the filtrate is sodium silicate solution, analyze the concentration and modulus of the obtained sodium silicate solution, and dilute it with deionized water Sodium silicate solution to 1mol / L. Add 12g of 1% polyethylene glycol to the sol-gel reaction kettle, raise the temperature to 40°C, and under strong stirring, add 100ml of 1mol / L sodium sili...

Embodiment 2

[0027] 200g of pyrolysis residue was crushed and sieved to 200 mesh, and calcined in a muffle furnace at 900°C for more than 3 hours to obtain 118g of white ash. The mass fraction of silicon dioxide in the ash was 78%. Add 118g of ash slag after calcination, add 20g of solid sodium hydroxide according to the molar ratio of silicon dioxide and solid sodium hydroxide in the ash slag is 2.9:1, add 480ml of deionized water according to the solid-liquid volume ratio of 1:3, in Under the condition of 95℃, carry out the reaction under normal pressure for 3~5 hours. After the reaction, filter, the filtrate is sodium silicate solution, analyze the concentration and modulus of the obtained sodium silicate solution, and dilute the sodium silicate solution with deionized water to 1.1mol / L; Add 20g of 1.5% polyethylene glycol to the sol-gel reaction kettle, heat up to 45°C, and add 1.1mol / L sodium silicate obtained by alkali dissolution reaction dropwise to the solution under strong stirri...

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Abstract

The invention relates to a method for preparing white carbon black by utilizing waste silicon rubber cracked residues. The method comprises the following steps of: crushing cracked residues, and calcining at high temperature; adding calcined ash residues, a certain amount of solid sodium hydroxide and water into a alkali-soluble reactor for reacting, and filtering to an obtain sodium silicate solution serving as filtrate; adding deionized water and a surfactant into a sol-gel reactor, and dripping an aqueous solution of sodium silicate and hydrochloric acid to obtain white carbon black, and washing, filtering, performing azeotropic dehydration with n-butyl alcohol and drying to obtain the white carbon black. According to the method, organic wastes in the residues are calcined at the high temperature to perform aerobic degradation reaction, so that toxic and harmful substances in the wastes are oxidized and pyrolyzed at the high temperature to be damaged; the superfine white carbon black is prepared from the calcined substances by the sol-gel technology; and the white carbon black has the advantages of high whiteness, small partical sizes, narrow particle size distribution, high flowability and the like, and the application range of the recycled products is broadened.

Description

technical field [0001] The invention relates to the technical field of silicone rubber cracking, in particular to a method for preparing white carbon black from waste silicone rubber cracking residue. Background technique [0002] From the understanding of the current situation of waste silicone rubber recycling, there is a problem that the residue generated in the process of waste silicone rubber recycling cannot be reused. In the prior art, a large amount of acid dust and ash are produced during the production and recycling of organosilicon rings by using the leftover waste of silicone rubber, which accounts for about 30% to 60% of the leftover waste. The main component of these ash residues is silica. The composition of the cracked ash residue is not single, and its main components are white carbon black, quartz sand, aluminum hydroxide, and residual silane oil. [0003] For the cracked products of silicone rubber, both ash and silane oil can be recycled, but the ash co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/12
Inventor 周文军朱文丁建人
Owner 江山市华顺有机硅有限公司
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