Preparation method of cryptocrystalline graphite/polyvinyl alcohol heat-conducting composite material

A heat-conducting composite material and aphanitic graphite technology, applied in heat exchange materials, chemical instruments and methods, sustainable manufacturing/processing, etc., can solve the problems of poor thermal conductivity of aphanitic graphite/polyvinyl alcohol, etc. Achieve the effects of dense heat conduction effect, increased density, and improved heat transfer efficiency

Inactive Publication Date: 2017-05-31
NANJING JOOZ INFORMATION SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the problem of poor thermal conductivity of cryptocrystalline graphite / polyvinyl alcohol in the prior art, the present invention provides a preparation method of cryptocrystalline graphite / polyvinyl alcohol thermally conductive composite material, and greatly improves the quality of cryptocrystalline graphite through purification technology Thermal conductivity of graphite / polyvinyl alcohol composites

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  • Preparation method of cryptocrystalline graphite/polyvinyl alcohol heat-conducting composite material

Examples

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Effect test

Embodiment 1

[0024] The preparation method of cryptocrystalline graphite / polyvinyl alcohol heat conduction composite material comprises the following steps:

[0025] In the first step, mix cryptocrystalline graphite, ammonium fluoride, and hydrochloric acid solution with a mass ratio of 6:3:22, heat to 45°C for 3 hours, wash with deionized water until neutral, and dry;

[0026] In the second step, 0.65 parts of sodium bicarbonate, 5 parts of cornstarch and 60 parts of cryptocrystalline graphite are weighed and mixed according to the weight ratio, and wet ball milled at a ball milling rate of 320r / min, and dried so that the moisture content is 1 ± 0.5%;

[0027] The third step is to dissolve polyvinyl alcohol in 95°C water, add the treated cryptocrystalline graphite mixture, mix evenly, and dry in an oven at a drying temperature of 55°C and a drying time of 3 hours; the cryptocrystalline The mass ratio of graphite mixture and polyvinyl alcohol is 1:2;

[0028] The fourth step is pulverizat...

Embodiment 2

[0030] The preparation method of cryptocrystalline graphite / polyvinyl alcohol heat conduction composite material comprises the following steps:

[0031] In the first step, mix cryptocrystalline graphite, ammonium fluoride, and hydrochloric acid solution with a mass ratio of 6:3:22, heat to 40°C for 3 hours, wash with deionized water until neutral, and dry;

[0032] In the second step, 0.5 parts of sodium bicarbonate, 4 parts of cornstarch and 40 parts of cryptocrystalline graphite are weighed and mixed according to the weight ratio, wet ball milled at a ball milling rate of 300r / min, and dried to make the moisture content 1 ± 0.5%;

[0033] The third step is to dissolve polyvinyl alcohol in water at 90°C, add the treated cryptocrystalline graphite mixture, mix evenly, and dry in an oven at a drying temperature of 50°C and a drying time of 3 hours; the cryptocrystalline The mass ratio of graphite mixture and polyvinyl alcohol is 1:2;

[0034] The fourth step is pulverization a...

Embodiment 3

[0036] The preparation method of cryptocrystalline graphite / polyvinyl alcohol heat conduction composite material comprises the following steps:

[0037] In the first step, mix cryptocrystalline graphite, ammonium fluoride, and hydrochloric acid solution with a mass ratio of 6:3:22, heat to 50°C for 3 hours, wash with deionized water until neutral, and dry;

[0038] In the second step, 0.8 parts of sodium bicarbonate, 6 parts of cornstarch and 80 parts of cryptocrystalline graphite were weighed and mixed according to weight ratio, wet ball milled at a ball milling rate of 50 r / min, and dried to make the moisture content 1 ± 0.5%;

[0039] The third step is to dissolve polyvinyl alcohol in water at 100°C, add the treated cryptocrystalline graphite mixture, mix evenly, and dry in an oven at a drying temperature of 60°C and a drying time of 3 hours; the cryptocrystalline The mass ratio of graphite mixture and polyvinyl alcohol is 1:2;

[0040] The fourth step is pulverization and...

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Abstract

The invention discloses a preparation method of a cryptocrystalline graphite/polyvinyl alcohol heat-conducting composite material, and belongs to the field of composite materials. The method comprises the following steps: 1, mixing cryptocrystalline graphite, ammonium fluoride and a hydrochloric acid solution, heating, washing with deionized water until the pH value is 7, and drying; 2, mixing weighed sodium bicarbonate, corn starch and cryptocrystalline graphite, performing wet ball milling and drying; 3, dissolving polyvinyl alcohol into water, adding the treated cryptocrystalline graphite mixture, mixing uniformly and drying in a drying oven; 4, pulverizing and performing hot-press molding. The thermal diffusion rate is 8 to 9 mm<2>/s, because in the cryptocrystalline graphite granules subjected to purifying treatment, the aggregation degree is high, the density is increased, the heat-conducting effect is denser, and the heat transfer efficiency is improved.

Description

technical field [0001] The invention belongs to the field of composite materials, and in particular relates to a method for preparing a cryptocrystalline graphite / polyvinyl alcohol heat-conducting composite material. Background technique [0002] Aphanitic graphite is a thermally conductive material, which is a deep metamorphic product of carbonaceous substances in rock formations through thermal decomposition (such as metamorphism from coal). Or aphanitic graphite derived from aerogenesis, with a carbon content of 60% to 80%, and poor ore selectivity. Its electrical conductivity, thermal conductivity, lubricity, and oxidation resistance are all lower than those of crystalline graphite. The mechanical strength of its finished products is high. Generally used in crucibles, electrodes, electric carbon, pencils. [0003] Polyvinyl alcohol is an important chemical raw material for the manufacture of polyvinyl acetal, gasoline-resistant pipes and vinylon synthetic fibers, fabr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L29/04C08L3/02C08K3/04C08K3/16C08K3/26C09K5/14
CPCC08L29/04C09K5/14C08L3/02C08K3/04C08K3/16C08K3/26Y02P20/10
Inventor 崔晨
Owner NANJING JOOZ INFORMATION SCI & TECH
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