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Production method of white carbon black with high yellowing resistance

A production method and technology of white carbon black, applied in the direction of silicon dioxide, silicon oxide, etc., can solve the problems of loss of anti-yellowing, loss of anti-yellowing, and poor anti-yellowing effect of additives, and achieve anti-yellowing performance. Excellent, improve whiteness, stable product quality effect

Active Publication Date: 2014-09-24
FUJIAN YUANXIANG CHEM
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AI Technical Summary

Problems solved by technology

Congenital deficiency, follow-up improvement is only a palliative method, and there are great hidden dangers. According to the particularity of the production process of downstream manufacturers of high-temperature vulcanized silicone rubber and the special environment in which the product is used, the anti-yellowing effect will be poor
The reasons are as follows: 1. Some additives added in the formula of high-temperature vulcanized silicone rubber will react with additives such as anti-yellowing agent, iron remover, and color treatment agent at high temperature or make the anti-yellowing agent, iron remover, and color treatment agent Second, the white carbon black treated with additives such as anti-yellowing agent and iron remover is manufactured into products, which are exposed to harsh external environments for a long time, such as ultraviolet rays, high temperature, oxygen in the air, water, etc. Under the complex action of steam, the additive will lose its anti-yellowing effect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0024] The preparation principle of the present invention is as follows:

[0025] Use strong acid type cation exchange resin and water glass for replacement reaction, remove positive metal ions in water glass, minimize the content of non-ferrous metal ions in water glass, so as to obtain pure sodium silicate solution; use high-purity liquid Ammonia or ammonia gas is prepared into a pure ammonia solution; production water includes preparation water, reaction water, and washing water, all of which are tap water treated by RO membrane reverse osmosis equipment. RO membrane reverse osmosis equipment can effectively remove non-ferrous metal ions, Minerals, organic matter, microorganisms, etc., to obtain pure water. The production raw materials treated by the above method can minimize the content of non-ferrous metals in the production raw materials of white carbon black, and avoid the introduction of other impurities or non-ferrous metals in the production process, thus fundamental...

Embodiment 1

[0037] 1. Production raw material preparation

[0038] 1.1, SiO 2 Content is the preparation of the sodium silicate solution of 3wt%

[0039] Put high-quality low-iron solid water glass with a modulus of 2.5 to 3.5 into the roller steaming ball, add pure water into the roller steaming ball and pass in steam treated by a precision filter, pressurize to 0.6~0.8MPa, Hold the pressure for 1 to 3 hours to obtain SiO 2 Concentrated water glass with a content of 10wt%, and then adding pure water to the concentrated water glass to prepare SiO 2 Dilute water glass with a content of 3wt%, the prepared dilute water glass is filtered through a precision filter to obtain water glass with a transparency greater than 200mm, and the water glass is pumped to the high-level tank, and flows through the high-level difference to the water glass with 001×7 strong acid Ion exchange is carried out in the exchange column of the type cation exchange resin, and the inside of the exchange column is co...

Embodiment 2

[0047] 1. Production raw material preparation

[0048] 1.1, SiO 2 Content is the preparation of the sodium silicate solution of 5wt%

[0049] Put high-quality low-iron solid water glass with a modulus of 2.5 to 3.5 into the roller steaming ball, add pure water into the roller steaming ball and pass in steam treated by a precision filter, pressurize to 0.6~0.8MPa, Hold the pressure for 1 to 3 hours to obtain SiO 2 Concentrated water glass with a content of 15wt%, and then adding pure water to the concentrated water glass to prepare SiO 2 Dilute water glass with a content of 5wt%, the prepared dilute water glass is then filtered through a precision filter to obtain water glass with a transparency greater than 200mm, and the water glass is pumped to the high-level tank, and flows through the high-level difference to the water glass filled with 001×7 strong acid Ion exchange is carried out in the exchange column of the type cation exchange resin, and the inside of the exchange ...

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Abstract

The invention relates to a production method of white carbon black with high yellowing resistance, and aims to solve the technical problem that the existing white carbon black is poor in yellowing resistance. The method comprises the following steps: carrying out ion exchange on water glass via a strong acid type cation exchange resin so as to obtain a sodium silicate solution; preparing liquid ammonia or ammonia gas and pure water into an ammonium hydroxide solution; preparing concentrated sulfuric acid and the pure water into a dilute sulfuric acid solution; mixing the sodium silicate solution, the ammonium hydroxide solution, the dilute sulfuric acid solution and the pure water for reacting; carrying out filter pressing on a product after the reaction and washing a filter cake with the pure water; then carrying out pulping, pulp grinding, spray drying and smashing on a filtrate obtained in a filter pressing and washing manner so as to obtain the white carbon black. According to the method, the obtained white carbon black only contains a tiny quantity of non-ferrous metal impurities; especially, the content of ferrous metal in the white carbon black can be decreased to 10ppm to 20ppm (Parts Per Million), so that the technical problem that the yellowing of the white carbon black is easy to generate when the white carbon black is used for producing silicone rubber is solved. The white carbon black provided by the invention is stable in quality and excellent in yellowing resistance.

Description

technical field [0001] The invention relates to the technical field of white carbon black production, in particular to a production method of high-yellowing white carbon black used for producing silicone rubber. Background technique [0002] At present, the production technology of white carbon black with high anti-yellowing is to add anti-yellowing agent (such as antioxidant), iron remover (such as complexing agent), color treatment agent (such as blue dye, etc.) after the production of white carbon black. Color masking method) and other post-processing agents. Congenital deficiency, follow-up improvement is only a palliative method, and there are great hidden dangers. According to the particularity of the production process of downstream manufacturers of high-temperature vulcanized silicone rubber and the special environment in which the product is used, the anti-yellowing effect will be poor. The reasons are as follows: 1. Some additives added in the formula of high-temp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/12
Inventor 王承辉汤晓剑王升锦李建华麻煜晶
Owner FUJIAN YUANXIANG CHEM
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