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A kind of method of dry grinding modified precipitated silica

A technology of precipitating white carbon black and dry grinding, applied in the direction of silica, silicon oxide, etc., can solve the problem of no chemical adsorption

Active Publication Date: 2020-09-18
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The conventional grinder is just a mechanical device for dispersing silica, and there is no chemical adsorption reaction.

Method used

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  • A kind of method of dry grinding modified precipitated silica
  • A kind of method of dry grinding modified precipitated silica
  • A kind of method of dry grinding modified precipitated silica

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Add 2g of Si747 into 10mL of absolute ethanol solution, add the silane ethanol solution of the above concentration into 20g of white carbon black at a speed of 0.5mL / min, and use figure 1 The grinder shown grinds. Then the white carbon black powder obtained by grinding is extracted with ethanol solution in a Soxhlet extractor for 24h (reflux once every 15min) to remove the physically adsorbed silane coupling agent, and then the white carbon black powder obtained by extraction is dried in an oven , to obtain surface-modified silica powder.

Embodiment 2

[0033] Add 1g of CTAB to 10mL of absolute ethanol solution, add the above solution to 20g of white carbon black at a rate of 2mL / min, and grind it with a grinder. Then the white carbon black powder obtained by grinding is extracted with ethanol solution in a Soxhlet extractor for 24h (reflux once every 15min) to remove physical adsorption, and then the white carbon black powder obtained by extraction is dried in an oven to obtain surface modified of white carbon black powder.

Embodiment 3

[0035] Add 1.5g of Si69 to 10mL of absolute ethanol solution, add the silane ethanol solution of the above concentration to 20g of white carbon black at a speed of 1mL / min, add the above concentration of silane ethanol solution to 20g of white carbon black, and grind with a grinder. Then the white carbon black powder obtained by grinding is extracted with ethanol solution in a Soxhlet extractor for 24h (reflux once every 15min) to remove the physically adsorbed silane coupling agent, and then the white carbon black powder obtained by extraction is dried in an oven , to obtain surface-modified silica powder.

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Abstract

The invention discloses a method for modifying precipitated white carbon black through dry grinding. The method specifically comprises the following steps that different kinds and different quantitiesof surfactants are added into a certain amount of an absolute ethanol solution to obtain active agent ethanol solutions with different concentrations; the active agent ethanol solutions with different concentrations are added into the white carbon black at a certain rate and ground by using a grinder. The method for modifying the precipitated white carbon black through dry grinding is combined with a redesigned grinding rod, when particles are dispersed, a surface modifier is uniformly added into the white carbon black, chemical mechanical force generated during grinding is utilized sufficiently, so that the surface modifier and hydroxyl on the surface of the white carbon black are subjected to a chemical reaction, and therefore the surface modifier is grafted onto the surface of the white carbon black, thereby achieving the purposes of improving the dispersibility of the white carbon black and regulating the hydrophilic and hydrophobic performance.

Description

technical field [0001] The invention relates to a method for modifying precipitated white carbon black by dry grinding. Background technique [0002] The main component of precipitated silica is hydrated silica. There are many groups on the surface of silica, including hydroxyl, siloxane, etc., so it is highly hydrophilic and easily forms agglomerates or secondary aggregation. At present, the most important use of white carbon black is the rubber industry, because it not only changes the disadvantages of carbon black not being able to change the color of the product, but also can produce high-quality rubber products, such as increasing wear resistance and wet skid resistance, and effectively reducing rolling resistance. and rubber heat up. Therefore, silica plays an important role in the field of green tires. [0003] However, due to the presence of a large number of hydroxyl groups on the surface of silica, which is highly hydrophilic, it is not easy to combine with the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/18C08K9/04C08K3/36
Inventor 姜海波李春忠孙莹单宏伟程志敏崔健
Owner EAST CHINA UNIV OF SCI & TECH