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High-thermal-conductivity polytetrafluoroethylene nanofiber membrane and manufacturing process thereof

A technology of polytetrafluoroethylene and nanofiber membranes, which is applied in sustainable manufacturing/processing, chemical industry, climate sustainability, etc., can solve problems such as high thermal conductivity and difficulty in production, and achieve high wear resistance and high durability Thermal, low production cost effect

Active Publication Date: 2022-08-09
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing technology is difficult to produce porous PTFE thermal film materials with high thermal conductivity

Method used

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  • High-thermal-conductivity polytetrafluoroethylene nanofiber membrane and manufacturing process thereof
  • High-thermal-conductivity polytetrafluoroethylene nanofiber membrane and manufacturing process thereof
  • High-thermal-conductivity polytetrafluoroethylene nanofiber membrane and manufacturing process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Taking nano-hexagonal boron nitride (nBN) as the thermal conductive filler, the preparation of high thermal conductivity PTFE nanofiber film is an example. The raw material is polybutylene terephthalate adipate produced by Lanshan Tunhe Company, Shanghai It is nano-hexagonal boron nitride powder produced by Ou Nano Technology Co., Ltd., and acrylic modified PTFE produced by Mitsubishi Chemical Co., Ltd. The blending equipment used in the experiment was a twin-screw extruder manufactured by Rice Company, the etching solvent was dimethylformamide, and the annealing equipment was a high-temperature tube furnace.

[0051] In the first step, the mixed powder raw materials consisting of 20% polytetrafluoroethylene powder, 20% nano-hexagonal boron nitride, and 60% polybutylene terephthalate adipate particles are placed in the Physical dry mixing is carried out in a rotating mixing tank.

[0052] In the second step, the dry-mixed powder is put into the feed port of the twin-sc...

Embodiment 2

[0058] Taking graphene and carbon nanotubes as thermal conductive fillers and powdered polytetrafluoroethylene as raw materials, the preparation of high thermal conductive polytetrafluoroethylene nanofiber membranes is an example. The raw materials are polyethylene terephthalate produced by Lanshan Tunhe Company. Butylene glycol ester, graphene and carbon nanotubes produced by Chengdu Organic, and acrylic modified polytetrafluoroethylene produced by Mitsubishi Chemical. The blending equipment used in the experiment was a twin-screw extruder manufactured by Rice Company, the etching solvent was dichloromethane, and the annealing equipment was a high-temperature tube furnace.

[0059] In the first step, the polybutylene terephthalate adipate particles are dissolved in dichloromethane, 100ml of dichloromethane contains 10g polybutylene terephthalate adipate, 2g graphene, and 2g carbon Nanotubes, using sodium dodecyl sulfate as a dispersant, ultrasonically dispersing the solution ...

Embodiment 3

[0066] Taking nano silver fiber as thermal conductive filler and powdered PTFE as raw material, the preparation of high thermal conductive PTFE nanofiber film is taken as an example. The raw material is polybutylene terephthalate adipate produced by Lanshan Tunhe Company. Alcohol esters, laboratory-made nano-silver fibers, and acrylic-modified polytetrafluoroethylene produced by Mitsubishi Chemical Corporation. The blending equipment used in the experiment was a twin-screw extruder manufactured by Rice Company, the etching solvent was dichloromethane, and the annealing equipment was a high-temperature tube furnace.

[0067] In the first step, the polybutylene terephthalate adipate particles are dissolved in dichloromethane, 200ml of dichloromethane contains 15g polybutylene terephthalate adipate, 7.5g nano-silver fibers, using Sodium dodecyl sulfate was used as a dispersant. After ultrasonically dispersing the solution for 5 hours, the solution was placed in a vacuum drying ov...

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Abstract

The invention discloses a high-thermal-conductivity polytetrafluoroethylene nanofiber membrane and a manufacturing process thereof. The process comprises the following steps: 1) performing cyclic shearing processing on a polytetrafluoroethylene raw material, a heat-conducting filler, polybutylene terephthalate adipate and the like at a high temperature through a double-screw extruder; and 2) extruding the fiberized blend, and calendering to obtain a precursor film. And (3) washing the precursor film for multiple times by using a solvent, and dissolving to remove the polybutylene terephthalate adipate in the film, thereby obtaining the heat-conducting modified polytetrafluoroethylene nanofiber film. And 4) performing high-temperature annealing on the nanofiber membrane under the fixing of a clamp, and then cooling. The process is simple, convenient, green and environment-friendly, and can be used for large-scale production, and the manufactured polytetrafluoroethylene film has a staggered nanofiber structure, high heat conductivity coefficient, high mechanical property and low thermal expansion coefficient, and has a wide application prospect in the electronic and electrical field.

Description

technical field [0001] The invention relates to the technical field of composite materials, in particular to a high thermal conductivity polytetrafluoroethylene nanofiber film and a manufacturing process thereof. Background technique [0002] The information disclosed in this Background of the Invention is only for enhancement of understanding of the general background of the invention and should not necessarily be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person of ordinary skill in the art. [0003] High-performance products such as tubes / sheets, films, gaskets, and bearings made of PTFE are widely used in electrical, chemical, mechanical, semiconductor, medical and other fields. However, PTFE has a low thermal conductivity, which limits its further application in electrical and electronic fields. At the same time, the linear expansion coefficient of polytetrafluoroethylene is high, and it changes wi...

Claims

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Application Information

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IPC IPC(8): C08J9/26C08J9/36C08L27/18C08K3/38C08K3/04C08K7/06
CPCC08J9/26C08J9/36C08J2201/0462C08J2327/18C08K2003/385C08K3/041C08K3/042C08K7/06C08K2201/011Y02P20/10
Inventor 柴佳龙王桂龙赵近川张爱敏赵国群
Owner SHANDONG UNIV
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