Heat-conducting polymer composite material and preparation method thereof using open mill

A technology of composite materials and polymers, which is applied in the field of thermally conductive polymer composite materials and their preparation of thermally conductive polymer composite materials using an open mill, which can solve the problems of poor thermal conductivity of polymer materials and complex methods of thermally conductive polymer composite materials. , to achieve the effect of low cost, excellent thermal conductivity and mechanical properties, and simple process

Inactive Publication Date: 2017-06-20
四川行泰新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a preparation method of polymer heat-conducting material, which uses the shear force between the double rollers of the open mill to compress and extrude the polymer material into a sheet, and uses hot pressing at a temperature lower than the viscous flow The molding process keeps the orientation of the filler in the fi

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036]A heat-conducting polymer composite material is prepared by using an open mill, and its preparation is carried out according to the following steps: at 40 ° C, POE elastomer (also known as polyolefin elastomer) and natural phosphorus flake graphite heat-conducting filler are placed in a vacuum oven Dry in 18h. Under the condition of 95°C, 100g of POE elastomer was added into the gap between the two rollers of the open mill and plasticized for 5min. Then add 80g of natural phosphorus flake graphite into the plasticized POE elastomer in 5 times, knead evenly and make a triangular bag 3 times. The kneaded POE elastomer is extruded into a sheet with a thickness of 0.2 mm in an open mill with a double-roll gap of 0.05 mm.

[0037] The extruded sheet was cut to the same size as the mold size, then superimposed to a thickness of 10 mm, put into the mold, and hot-pressed at a temperature of 85° C. for 10 minutes. Finally, the thermal conductivity along the thickness direction ...

Embodiment 2

[0039] A method for preparing a thermally conductive polymer composite material using an open mill, the preparation of which is carried out according to the following steps: at 40°C, place POE elastomer and hexagonal boron nitride thermally conductive filler in a vacuum oven for 18 hours. Under the condition of 95°C, 100g of POE elastomer was added into the gap between the two rollers of the open mill and plasticized for 5min. Then add 80g of hexagonal boron nitride into the plasticized POE elastomer in 5 times, knead evenly and make a triangular bag 3 times. The kneaded POE elastomer is extruded into a sheet with a thickness of 0.1 mm in an open mill with a double-roll gap of 0.2 mm.

[0040] The extruded sheet is cut to the same size as the mold size, then superimposed to a thickness of 10mm and put into the mold, and hot-pressed at a temperature of 85°C for 10min. Finally, the thermal conductivity along the thickness direction is 0.8W / mK, the thermal conductivity perpendic...

Embodiment 3

[0042] A method for preparing heat-conducting polymer composite materials using an open mill, the preparation of which is carried out according to the following steps: at 60°C, place natural rubber and hexagonal boron nitride heat-conducting fillers in a vacuum oven for drying for 20 hours. Under the condition of 45°C, 100g of natural rubber was added into the gap between the two rollers of the open mill and plasticized for 2min. Then add 5g of zinc oxide, 2g of stearic acid, 2.5g of sulfur, 0.6NOBS, and 100g of hexagonal boron nitride into the plasticized natural rubber, knead evenly, and make triangular bags three times. The kneaded natural rubber is extruded into a sheet with a thickness of 0.3 mm in an open mill with a gap between two rollers of 0.2 mm.

[0043] The extruded sheet was cut to the same size as the mold size, then superimposed to a thickness of 50 cm, put into the mold, and hot-pressed at a temperature of 145° C. for 10 minutes. Finally, the thermal conducti...

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Abstract

The invention discloses a heat-conducting polymer composite material and a preparation method of the heat-conducting polymer composite material using an open mill. Sheet-shaped or rod-shaped heat-conducting filler with a larger length-diameter ratio is oriented along the direction of the sheet material by utilizing the shearing force between two rollers, and then the sheet material can be overlapped to any thickness, and the orientation of the filler is kept in the product by hot-pressing molding at a temperature lower than the viscosity-flow temperature. The heat conduction performance of the product has anisotropy, the heat conduction performance is good in the orientation direction of the filler, the heat conduction coefficient can reach 10W/mk, and the heat conductivity coefficient in the direction perpendicular to the orientation is smaller than 3 W/mk.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and specifically refers to a heat-conducting polymer composite material and a method for preparing the heat-conducting polymer composite material by using an open mill. Background technique [0002] In recent years, with the rapid development of the intensive electronic equipment industry, a large amount of heat generated by the equipment during operation greatly reduces the operating life and stability of the equipment. Thermally conductive polymer composite materials are widely used in the field of electronic equipment, but polymer materials have poor thermal conductivity, and their thermal conductivity is generally only 0.2-0.4W / mK. The traditional preparation methods mainly include melting method, solvent method and in-situ generation method. However, these preparation methods are difficult to prepare composite materials with thermal conductivity greater than 3W / mK, and the additio...

Claims

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Application Information

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IPC IPC(8): C08L23/08C08L7/00C08L83/07C08L23/16C08K13/04C08K3/38C08K7/00C08K3/04C08K7/24C09K5/14B29B7/56
CPCC08K7/00B29B7/56C08K3/04C08K3/06C08K3/38C08K5/09C08K7/24C08K13/02C08K2003/385C08K2201/011C09K5/14C08L23/0815C08L7/00C08L83/04C08L23/16
Inventor 张建威唐依然陶晓丽曾珠
Owner 四川行泰新材料科技有限公司
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