A modification method of precipitation white carbon black

A technology of precipitated white carbon black and white carbon black, applied in the direction of silica, silicon oxide, etc., can solve the problems of complex process, high cost, pollution, etc., and achieve the effect of simple equipment and process, and easy operation

Active Publication Date: 2021-06-25
EAST CHINA UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a new method for surface modification of white carbon black in the gas phase process by using a rapid high-temperature flame, so as to overcome the problems of complex process, high cost and serious pollution in the above-mentioned background technology

Method used

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  • A modification method of precipitation white carbon black
  • A modification method of precipitation white carbon black
  • A modification method of precipitation white carbon black

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] 1) Combustion of hydrogen and oxygen at a volume ratio of 1:0.5 forms a high-temperature flame with a flame temperature of 2100°C.

[0017] 2) Precipitated silica enters the high-temperature flame through oxygen transport, and the ratio of carrier gas to silica powder feed is 1m 3 : 0.1kg, the residence time of silica powder in high temperature flame is 10 seconds.

[0018] 3) the thermal gravimetric analysis figure of the white carbon black powder that this example obtains and original powder sees figure 1 ,Depend on figure 1 It can be seen that the water content of the treated white carbon black powder dropped from 7.5% to 1.2%.

[0019] 4) The white carbon black powder that present embodiment obtains and the TEM figure of original powder see figure 2 and image 3 , it can be seen from the figure that this method can reduce the surface hydroxyl groups of precipitated silica through high-temperature flame treatment, reduce the force between particles, and improve ...

Embodiment 2

[0021] 1) Change the oxidant in Example 1 to air, change the volume ratio of hydrogen to air to 1:3, keep other parameters and steps unchanged, and the water content of the silica powder obtained in this example is 2.5%.

Embodiment 3

[0023] 2) Change the gaseous fuel into acetylene in embodiment 1, change the oxidant into air, change the volume ratio of acetylene and air into 1:10, change the residence time into 1 second, and other parameters and steps are all unchanged, and the present embodiment obtains The moisture content of the white carbon black powder is 4%.

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Abstract

The invention discloses a modification method of precipitation white carbon black, which adopts rapid high-temperature flame to modify the surface of white carbon black in the gas phase process, so as to reduce the adsorption water and surface hydroxyl groups of precipitation white carbon black, thereby reducing the powder The thermal weight loss is obtained to produce white carbon black. In the present invention, a high-temperature flame of 600-2100°C is generated through the combustion of gaseous fuel and oxidant, and the precipitated silica powder is brought into the high-temperature flame through the carrier gas, and the precipitated silica is quickly removed within a residence time of 1-10 seconds The adsorption of water and surface hydroxyl groups can reduce the thermal weight loss of powder. Extremely short residence time can avoid powder sintering and improve its dispersion performance. Due to the simple operation and low cost of this method, the continuous modification method can realize industrial application.

Description

technical field [0001] The invention relates to the field of chemical material production, in particular to a method for modifying precipitation white carbon black. Background technique [0002] White carbon black refers to ultrafine and active silica particles, and its chemical name is hydrated amorphous silica or colloidal silica. According to different preparation methods, it is mainly divided into precipitated silica and fumed silica. Silica is a porous substance whose composition can be SiO 2 ·nH 2 O represents, where nH 2 O exists in the form of surface hydroxyl groups. [0003] Precipitated silica refers to a kind of sulfuric acid, hydrochloric acid, CO 2 Silica produced with water glass as the basic raw material. The precipitation production process mainly uses sulfuric acid and water glass as raw materials, and the white carbon black synthetic liquid obtained after the reaction is a mixed system of silica, sodium sulfate and water. Therefore, it is necessary ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/12
CPCC01B33/12C01P2004/03C01P2004/04
Inventor 胡彦杰李春忠江浩常成郝彩霞赵振呈李玉冰
Owner EAST CHINA UNIV OF SCI & TECH
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