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High dispersion gel-free white carbon black and its preparing method

A gel-free white carbon black, high-dispersion technology, applied in the direction of silicon dioxide, silicon oxide, etc., can solve the problems of high cost, less product variety, low reinforcement performance, etc., and achieves the reduction of water consumption and electricity consumption. Effect

Inactive Publication Date: 2007-01-24
周玉芳 +3
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Problems solved by technology

[0015] The technical problem to be solved by the present invention is: because foreign white carbon black products use expensive chemical agents on the basis of producing gel-containing products to carry out surface modification treatment on white carbon black to overcome its gel-induced The strong agglomeration of the product has the disadvantage of poor dispersibility. After the product, its dispersibility has been significantly improved, but it cannot have a complete dispersion effect, and the process equipment is complicated, the processing is expensive, time-consuming and laborious, so the cost is high and the price is high. ; while there are many domestic manufacturers of precipitated silica, but there are fewer product varieties and lower grades, the product activity is not high, the particles are not easy to control, the affinity is poor, the reinforcing performance is low, and the hydrophilic group bonding on the surface of the particles is serious , which weakens the binding force of the product

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  • High dispersion gel-free white carbon black and its preparing method

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Embodiment Construction

[0038] The present invention is a kind of highly dispersed gel-free white carbon black, which contains SiO with a weight percentage of more than 99% 2 , the specific surface area of ​​highly dispersed gel-free silica is 320m 2 / g~380m 2 / g, wherein the primary particle size <11 nanometers.

[0039] A method for preparing highly dispersed gel-free white carbon black, the raw materials used include sodium silicate, concentrated sulfuric acid and water with a concentration of 90% to 99% by mass, and the method includes the following steps:

[0040] 1) First add sodium silicate in the synthesis tank, then add water to dissolve;

[0041] 2) Add sulfuric acid with a mass percentage concentration of 90 to 99% in the synthesis tank to carry out a chemical reaction, and add the stabilizer Na 2 SO 4 , adding an appropriate amount of dispersant Na 2 SO 4 , it is necessary to stir while reacting, and the stirring speed is controlled in the range of 40-200 rpm;

[0042] 3) After the...

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Abstract

The present invention discloses a kind of high dispersion gel-free white carbon black, which contains SiO2 over 99 wt%, and has specific surface area of 320-380 sq m / g and particle diameter smaller than 11 nm. The present invention also discloses the preparation process of the high dispersion gel-free white carbon black, and the preparation process is one direct process including dissolving, synthesis, filtering and spray drying. The preparation process has low production cost.

Description

technical field [0001] The invention relates to a non-metallic powder and a preparation method thereof, in particular to a highly dispersed gel-free white carbon black and a preparation method thereof. Background technique [0002] Highly dispersed gel-free silica, also known as hydrated silica powder, is an important fine inorganic chemical product. At present, there are mainly two kinds of current processes at home and abroad that have been industrialized: one is the gas phase method using silicon tetrachloride or trichlorosilane as the raw material, and the other is the precipitation method using water glass as the raw material. [0003] 1. The current situation, level and development trend of fumed silica [0004] Due to the production characteristics of fumed silica, the product has high dispersion, but due to the complicated process, high product cost, large investment and high energy consumption, its application range is limited. [0005] The annual production capac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/14C01B33/18
Inventor 周玉芳邱根萍刘昌荣周怡
Owner 周玉芳
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