A kind of precipitation method silica surface modification method

A technology of precipitation silica and surface modification, which is applied in the field of silica, can solve the problems of chemical reagent pollution, carbon layer is easy to fall off, etc., and achieve the effect of improving dispersion performance, improving balance performance, and facilitating constant temperature

Active Publication Date: 2022-04-15
SHANDONG LINK SCI & TECH CO LTD
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  • Description
  • Claims
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Problems solved by technology

[0005] In order to solve technical problems such as the easy pollution of chemical reagents caused by the modification of surfactants and the easy fall off of the carbon layer in the surface carbon coating modification of silicon dioxide by the conventional precipitation method, the invention discloses a surface modification method of white carbon black by the precipitation method. The sexual steps are as follows:

Method used

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  • A kind of precipitation method silica surface modification method
  • A kind of precipitation method silica surface modification method

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Experimental program
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Effect test

Embodiment 1

[0020] The modification steps of the white carbon black in the present embodiment are as follows,

[0021] (1) Mixing, add the white carbon black powder powder prepared by the precipitation method to 200 mesh and 300 mesh vitamin C powder in a mass ratio of 1:1 to the mixer for mixing. The mixing time is 30 minutes. After mixing, transfer the mixture into the ball mill.

[0022] (2) Ball milling reaction, the reaction temperature is 25° C., the ball mill speed is 230 r / min, and the ball milling time is 2 hours. During the reaction process, dry nitrogen gas was introduced at a rate of 40 ml / min to take away the moisture generated during the ball milling process.

[0023] (3) Heating and carbonization. After the ball milling reaction, transfer the ball milled product to the reactor, and introduce hot air for carbonization reaction. The temperature of the hot air is 200°C, the flow rate is 190ml / min, and the heating time is 2.5h. When the temperature is lowered to room temperat...

Embodiment 2

[0025] The modification steps of the white carbon black in the present embodiment are as follows,

[0026] (1) Mixing, add the white carbon black powder powder prepared by the precipitation method to 100 mesh and add 200 mesh vitamin C powder to the mixer at a mass ratio of 1:0.8 for mixing. The mixing time is 30 minutes. After mixing, transfer the mixture into the ball mill.

[0027] (2) Ball milling reaction, the reaction temperature is 60° C., the ball mill speed is 270 r / min, and the ball milling time is 2 hours. During the reaction process, dry nitrogen gas was introduced at a rate of 60 ml / min to take away the moisture generated during the ball milling process.

[0028] (3) Heating carbonization. After the ball milling reaction is over, the ball milling product is transferred to the reactor, and hot air is introduced to carry out the carbonization reaction. The temperature of the hot air is 230° C., the flow rate is 190ml / min, and the heating time is 2 hours. After rea...

Embodiment 3

[0030] The modification steps of the white carbon black in the present embodiment are as follows,

[0031] (1) Mixing, add the white carbon black powder powder prepared by the precipitation method to 100 mesh and add 200 mesh vitamin C powder to the mixer at a mass ratio of 1:0.9 for mixing. The mixing time is 30 minutes. After mixing, transfer the mixture into the ball mill.

[0032] (2) Ball milling reaction, the reaction temperature is 40° C., the ball mill speed is 250 r / min, and the ball milling time is 3 hours. During the reaction process, dry nitrogen gas was introduced at a rate of 50 ml / min to take away the moisture generated during the ball milling process.

[0033] (3) Heating carbonization. After the ball milling reaction is over, the ball milling product is transferred to the reactor, and hot air is introduced for carbonization reaction. The temperature of the hot air is 230°C, the flow rate is 240ml / min, and the heating time is 2h. After reaching room temperatu...

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Abstract

The invention discloses a surface modification method of white carbon black by precipitation method. In the modification method, vitamin C powder is selected as a carbon source to carry out coating reaction on white carbon black prepared by precipitation method. First, vitamin C powder and white carbon black The condensation reaction of the hydroxyl groups on the surface of the powder occurs under mechanical grinding conditions, and the silica and vitamin C are linked together in the form of carbon-oxygen-silicon covalent bonds through dehydration to form a single product, which is then carbonized at a temperature of 200-230°C After the reaction, the modified white carbon black whose surface is covered with a carbon layer is obtained. Modified silica has a series of advantages such as high dispersibility and hydrophobicity. In addition, the existence of covalent bonds greatly improves the stability and service life of the modified product. The raw materials used in the invention are cheap and easy to obtain, the process flow is short, the operation is simple and convenient, the method is green and environment-friendly, and at the same time, the reaction product is relatively uniform, and the product yield and purity are high.

Description

technical field [0001] The invention relates to the technical field of white carbon black, in particular to a method for modifying the surface of white carbon black by a precipitation method. Background technique [0002] Silica plays an extensive and irreplaceable role in the field of national life. Because of its stable properties at room temperature, insoluble in acids (except hydrofluoric acid) and soluble in strong alkalis, it has important applications in the fields of feed, pesticides, papermaking, etc.; and because of its excellent stability, reinforcement, and thickening properties And thixotropy, has always been one of the important fillers in rubber, plastics, coatings and other products; some silica is often added in the production process of rubber, and silica mainly plays the role of crosslinking and reinforcement in rubber materials. Accounting for about 70% to 80% of the total production of silica, the addition of silica can greatly improve the physical prop...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09C1/28C09C3/04C09C3/06C09C3/08
CPCC09C1/28C09C3/006C09C3/041C09C3/06C09C3/08
Inventor 刘红亮殷鹏刚吴晓林李祥凯刘彩艳
Owner SHANDONG LINK SCI & TECH CO LTD
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