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Graphene-white carbon black composite powder and preparation technology thereof

A technology of olefinic silica and composite powder, applied in the application of polymer fillers, graphene silica composite powder and its preparation field, can solve the problem of reducing the electrostatic conductivity between tires and tread running surfaces, The volume resistivity of rubber products is reduced, and the wear resistance of rubber is reduced, so as to achieve the effect of broadening the market application field, facilitating large-scale production, and uniform dispersion

Inactive Publication Date: 2018-01-05
CHENGDU ORGANIC CHEM CO LTD CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the insulating properties of white carbon black, directly replacing carbon black with white carbon black in whole or in part for rubber products will cause a decrease in the volume resistivity of rubber products, and for tire rubber products, it will reduce the inter-tire and tread performance. Electrostatic conductivity between surfaces
In addition, the interaction between silica and rubber is weak, which will lead to a decrease in the wear resistance of rubber. Therefore, increasing the interaction between silica and rubber and improving its electronic conductivity are the current research directions for silica fillers.

Method used

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  • Graphene-white carbon black composite powder and preparation technology thereof
  • Graphene-white carbon black composite powder and preparation technology thereof
  • Graphene-white carbon black composite powder and preparation technology thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Step 1: Weigh 20.0 g of graphite powder with a purity of 99%, and 10.0 g of sodium nitrate, add it to 500 ml of concentrated sulfuric acid solution and stir, slowly add 80.0 g of potassium permanganate powder in a water bath at room temperature and stir for 12 hours. The reaction mixture was poured into 4000ml of deionized water and 100ml of hydrogen peroxide solution was added to remove unreacted potassium permanganate, thereby obtaining a bright yellow graphene oxide solution. Pour the solution into a centrifuge tube for centrifugation, remove the bottom precipitate, and repeatedly wash with deionized water three times to obtain a brown-red graphite oxide solution with a solid content of 7%wt. Add the above graphene oxide solution into 1000ml of deionized water, and stir at a speed of 1000r / min with a high-speed mixer, add 240g of white carbon black powder, and stir for 1h to obtain a uniform solution.

[0024] Step 2: Add 1.0 g of sodium dodecylbenzenesulfonate, 10 g...

Embodiment 2

[0027] Step 1: Weigh 5.0g of expanded graphite powder with a purity of 99%, and 4.0g of sodium nitrate, add it to 150ml of concentrated sulfuric acid solution and stir, slowly add 10.0g of potassium permanganate powder in a water bath at room temperature and stir for 2 hours, and place the reaction solution in a water bath Heated to 60°C for 2h. Then the reaction mixture was poured into 1200ml of deionized water and 15ml of hydrogen peroxide solution was added to remove unreacted potassium permanganate, thereby obtaining a bright yellow graphene oxide solution. Pour the solution into a centrifuge tube for centrifugation, remove the bottom precipitate, and repeatedly wash with deionized water three times to obtain a brown-red graphite oxide solution with a solid content of 6% wt. Add the above graphene oxide solution into 200ml of deionized water, and stir at a speed of 600r / min with a high-speed mixer, add 30g of white carbon black powder, and stir for 1h to obtain a uniform s...

Embodiment 3

[0031] Prepare 1000 g of graphene oxide solution according to Step 1 of Example 2, with a solid content of 6% wt, add 120 g of white carbon black powder, and use a sand mill to mix and stir for 30 minutes to obtain a uniformly dispersed solution. Add 5 g of polyoxyethylene and 40 g of melamine to the solution and mix and stir for 1 h using a sand mill to obtain a uniform dispersion. Put the solution into a 90-degree blast oven for heat treatment for 2 hours to form a hydrogel, filter and dry the hydrogel to obtain a graphene oxide silica aerogel, and transfer the aerogel to a tube furnace under nitrogen gas The graphene silica aerogel can be obtained by calcining at 800°C for 2 hours in the atmosphere, and the aerogel is pulverized to obtain a graphene silica composite powder. The carbon content, resistivity and specific surface area of ​​the composite powder are shown in Table 1. By changing the mass ratio of graphene oxide to silica, graphene silica composite powders with d...

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Abstract

The invention relates to graphene-white carbon black composite powder and a preparation technology thereof. The preparation technology comprises dispersing a graphene oxide aqueous solution and whitecarbon black powder in water at a high speed to obtain uniform mixed aqueous slurry, adding a gelling agent and a surfactant into mixed aqueous slurry, adjusting pH of the solution so that graphene oxide-white carbon black hydrogel is obtained, filtering and drying the graphene oxide-white carbon black hydrogel to obtain graphene oxide-white carbon black aerogel and calcining the graphene oxide-white carbon black aerogel at a high temperature in the inert atmosphere to reduce the graphene oxide so that the graphene-white carbon black composite powder is obtained. The preparation technology issimple and reliable and realizes a low cost. The graphene-white carbon black composite powder has powder resistivity less than 100 omega. cm, graphene in the composite material has good single layer dispersity, rich pore structures are formed through layer enwinding, the white carbon black nano-particles are uniformly dispersed on the surface of the graphene layer, and the composite material has excellent electrical conductivity and thermal conductivity and can be widely used in the fields of coatings, rubber products and plastic.

Description

technical field [0001] The invention relates to the field of graphene composite materials, in particular to a graphene silica composite powder with high dispersion uniformity and its preparation technology, and the obtained graphene silica composite powder with high conductivity Application technology as a polymer filler. Background technique [0002] Graphene, as a new type of two-dimensional material, is a single layer of carbon atoms composed of sp2 hybridized carbon atoms in the form of a honeycomb structure. This unique structure makes graphene have excellent physical and chemical properties, such as high electrical and thermal conductivity, large specific surface area, high transparency, chemical inertness and excellent mechanical strength, making it widely used in plastics, rubber, coatings, etc. The field of molecular packing has huge application value and potential market. However, due to the huge specific surface area of ​​single-atom-thick graphene sheets, there...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/30C09C1/46C09C3/06C09C3/08C09C3/10
Inventor 魏志凯黄美灵张焕瞿美臻
Owner CHENGDU ORGANIC CHEM CO LTD CHINESE ACAD OF SCI
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