Graphite particles modified by thiol modification and its preparation method and application

A technology of sulfhydrylation modification and graphite particles, which is applied in the directions of graphite and carbon-silicon compound conductors, can solve the problems of difficulty in preparing dense and thin silver-shell graphite particles, low surface reactivity of graphite particles, and difficult nucleation of silver nuclei. To achieve the effect of dense and continuous silver shell layer, easy to popularize and apply, and low silver content

Active Publication Date: 2017-08-25
武汉双虎涂料股份有限公司
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a method for modifying the surface of graphite particles and its application in the preparation of conductive and electromagnetic shielding fillers, to solve the problems of low surface reactivity of graphite particles, difficult nucleation of silver crystal nuclei, and difficulty in preparing dense thin films. Graphite particles coated with silver shell

Method used

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  • Graphite particles modified by thiol modification and its preparation method and application
  • Graphite particles modified by thiol modification and its preparation method and application
  • Graphite particles modified by thiol modification and its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0037] Cleaning steps: Soxhlet extractor can effectively remove oil stains on the surface of graphite particles (such as: diesel oil, vegetable oil, etc.). Pour 100 mL of water / ethanol mixed solvent with a volume ratio of 1:1 into a Soxhlet extractor round bottom flask, then wrap 30 g of graphite particles with filter paper, place in the Soxhlet extractor, and reflux for 6 h. After that, wash with ethanol for 3 times, filter with suction, dry in an oven at 60°C for 2 hours, and set aside;

[0038] Mercaptolation modification: Weigh 2.5g of graphite particles and place them in a three-necked flask, pour 18mL of deionized water and 82mL of ethanol (volume ratio: 0.22:1) in sequence, stir magnetically, and when the temperature rises to 60°C, add γ- Mercapto-propyltrimethoxysilane and ammonia water, to ensure that the concentrations of the two are 5mL / L and 20mL / L, respectively, and react at this temperature for 6h, filter with suction, wash with absolute ethanol, repeat 3 times, ...

Embodiment 2

[0044] The cleaning of graphite particles and the liquid phase chemical reduction of silver are the same as in Example 1.

[0045] Thiolation modification: Weigh 2.5g of graphite and place it in a three-necked flask, pour 66mL of deionized water and 33mL of ethanol (volume ratio: 2:1) in sequence, stir magnetically, and when the temperature rises to 85°C, add γ-mercapto -Propyltrimethoxysilane and ammonia water, ensure that the concentrations of the two are 10mL / L and 200mL / L respectively, and react at this temperature for 6h, filter with suction, wash with absolute ethanol, repeat 3 times, and store at 60°C Dry in an oven for 6 hours.

[0046] Such as Figure 6 As shown, it can be seen that the surface morphology of the graphite@Ag composite particles synthesized in Example 2 of the present invention is consistent with the effect of Example 1.

Embodiment 3

[0048] The cleaning of graphite particles and the liquid phase chemical reduction of silver are the same as in Example 1.

[0049] Thiolation modification: Weigh 2.5g of graphite and place it in a three-necked flask, pour 2mL of deionized water and 100mL of ethanol (volume ratio: 0.02:1) in turn, stir magnetically, and when the temperature rises to 60°C, add γ-mercapto -Propyltrimethoxysilane and ammonia water, to ensure that the concentrations of the two are 3mL / L and 1mL / L respectively, and after reacting at this temperature for 6h, filter with suction, wash with absolute ethanol, repeat 3 times, and store at 60°C Dry in an oven for 6 hours.

[0050] Such as Figure 7 As shown, it can be seen that the surface morphology of the graphite@Ag composite particles synthesized in Example 3 of the present invention is consistent with the effect of Example 1.

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Abstract

The present invention relates to a kind of mercapto-modified graphite particles and its preparation method and application, comprising the following steps: 1) cleaning the surface of flake graphite particles, suction filtering and drying; 2) placing the graphite particles obtained in step 1) in water and adding a silane coupling agent and a catalyst into the mixed solution with ethanol; 3) controlling the reaction temperature to carry out thiol modification, suction filtration, washing, and drying to obtain mercapto-modified graphite particles. Compared with the prior art, the present invention has the following main advantages: 1. The silver shell layer of the composite particle prepared by the method is dense and continuous, and the silver content is low. 2. The preparation process of the present invention is simple, the cost is low, and it is convenient for popularization and application.

Description

technical field [0001] The invention relates to the field of conductive and electromagnetic shielding composite materials, in particular to a thiol-modified graphite particle and a preparation method and application thereof. Background technique [0002] Surface silver-coated core-shell composite particle fillers can overcome the problems of high density, high cost, and poor compatibility of polymer matrix in traditional single-component metal fillers (such as silver, copper, and nickel, etc.), so they are widely used in conductive Composite materials with electromagnetic protection. Since silver-coated graphite core-shell composite particles have both the excellent characteristics of graphite and silver, they are considered to be one of the functional particles with the most application potential in surface-coated silver core-shell composite particle fillers. For example: graphite particles have good electrical and thermal conductivity, and are light in weight (the density...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/21H01B1/04
Inventor 赵素玲罗仕刚王一龙任可陈志宏官建国
Owner 武汉双虎涂料股份有限公司
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