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Forming method of polytetrafluoroethylene impregnated sheet with high filling amount

A polytetrafluoroethylene and molding method technology, which is applied in applications, household appliances, flat products, etc., can solve the problems of poor heat dissipation of copper clad laminates, and achieve the effects of improving production efficiency of dipping, reducing dipping costs, and simple process methods

Pending Publication Date: 2022-03-11
CHINA ELECTRONICS TECH GRP NO 46 RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this patent does not fundamentally solve the problems of the appearance and molding uniformity of the impregnated sheet itself
Patent application CN202011312474.1 describes a PTFE high-frequency high-speed copper-clad laminate and its preparation method. The patent uses PTFE film, kraft paper, and copper foil to design the structure of the copper-clad laminate, which improves the flexibility of the copper-clad laminate and solves the problem of heat dissipation of the copper-clad laminate. The problem of poor performance, but the CCL with excellent performance has not been obtained from the performance and uniformity of the base material itself

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A method for forming a polytetrafluoroethylene impregnated sheet with a high filler content, comprising the steps of:

[0022] Step (1): For batching, polytetrafluoroethylene emulsion with a solid content of 60% is used and mixed evenly with silica powder with a D50 particle size of 10 microns to prepare polytetrafluoroethylene glue with a high filler content.

[0023] Step (2): dipping, using a high-temperature vertical gluing machine, impregnating the polytetrafluoroethylene glue obtained in step (1) on the glass fiber cloth by dipping, so that the thickness of the impregnated sheet is 230 microns;

[0024] Step (1) silicon dioxide accounts for 75% of the total mass of polytetrafluoroethylene glue.

[0025] Step (2) The impregnation method is: put the glass fiber cloth directly in the glue tank for direct impregnation, without scraping glue on both sides of the impregnated sheet, the speed of impregnation is 1m / min, and the temperature of the oven during impregnation ...

Embodiment 2

[0028] Step (1): For batching, polytetrafluoroethylene emulsion with a solid content of 60% is used and mixed evenly with silica powder with a D50 particle size of 10 microns to prepare polytetrafluoroethylene glue with a high filler content.

[0029] Step (2): dipping, using a high-temperature vertical gluing machine, impregnating the polytetrafluoroethylene glue obtained in step (1) on the glass fiber cloth by dipping, so that the thickness of the impregnated sheet is 230 microns;

[0030] Step (3): calendering, the impregnated sheet obtained in step (2) is passed through a double-roll calender with roller heating function, and the thickness of the sheet obtained by calendering is 150 microns.

[0031] The silicon dioxide described in step (1) accounts for 75% of the total mass of polytetrafluoroethylene glue.

[0032] The impregnation method described in step (2) is: put the glass fiber cloth directly in the glue tank for direct impregnation, without scraping glue on both s...

Embodiment 3

[0037] Step (1): For batching, polytetrafluoroethylene emulsion with a solid content of 60% is used and mixed evenly with silica powder with a D50 particle size of 10 microns to prepare polytetrafluoroethylene glue with a high filler content.

[0038] Step (2): dipping, using a high-temperature vertical gluing machine, dipping the polytetrafluoroethylene glue obtained in step (1) on the glass fiber cloth by dipping, so that the thickness of the impregnated sheet is 240 microns;

[0039] Step (3): calendering, the impregnated sheet obtained in step (2) is passed through a double-roll calender with roller heating function, and the thickness of the sheet obtained by calendering is 160 microns.

[0040] Step (1) silicon dioxide accounts for 85% of the total mass of polytetrafluoroethylene glue.

[0041] Step (2) The impregnation method is: put the glass fiber cloth directly in the glue tank for direct impregnation, without scraping glue on both sides of the impregnated sheet, the ...

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Abstract

The invention relates to a forming method of a polytetrafluoroethylene impregnated sheet with high filler quantity, which comprises the following steps: firstly impregnating a glass fabric with polytetrafluoroethylene slurry with high filler quantity in an impregnating manner to obtain a pre-impregnated sheet with the thickness of 200-250 microns, and then passing the impregnated sheet through a double-roller calender with heatable rollers to obtain the polytetrafluoroethylene impregnated sheet with high filler quantity. And the impregnated sheet with the thickness of 150-170 microns is obtained. By using the method, the polytetrafluoroethylene impregnated sheet with high filling amount can be obtained, and the thickness uniformity of the impregnated sheet is excellent; and through calendaring treatment of the impregnated sheet, bubbles on the surface of the impregnated sheet can be removed to a certain extent, and the method is suitable for industrial production and popularization.

Description

technical field [0001] The invention belongs to the technical field of forming polytetrafluoroethylene impregnated sheets, in particular to a method for forming polytetrafluoroethylene impregnated sheets with high filler content. [0002] technical background [0003] With the rapid development of radio communication technology, the frequency of high-frequency model transmission and signal processing equipment has also rapidly developed from 3G and 4G to 5G, which also puts forward higher requirements for high-frequency microwave dielectric materials. Polytetrafluoroethylene (PTFE) material has excellent dielectric properties (lower dielectric constant and dielectric loss), as well as good chemical stability and thermal stability, making it widely used in microwave dielectric materials. In order to meet the high-quality transmission of signals, higher requirements are put forward for the preparation and molding steps of raw materials, and the uniformity of impregnated sheets ...

Claims

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Application Information

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IPC IPC(8): B29C70/50C08L27/18C08K3/36C08K7/14B29L7/00
CPCB29C70/504C08K3/36C08K7/14B29L2007/002C08L27/18
Inventor 乔韵豪刘正张立欣张伟高枢健王军山洪颖李强
Owner CHINA ELECTRONICS TECH GRP NO 46 RES INST
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