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Polyimide/polytetrafluoroethylene composite membrane for insulation of electric wire and cable and preparation method thereof

A technology of polytetrafluoroethylene and polyimide, applied in the direction of insulated conductors, insulated cables, chemical instruments and methods, etc., can solve the problems of high equipment requirements, complicated process, and inability to cure at room temperature, and achieve good insulation performance, The effect of excellent mechanical properties and low dielectric constant

Active Publication Date: 2015-06-17
GUANGZHOU KAIHENG SPECIAL WIRE & CABLE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, a single PTFE material cannot be bonded to the coating interface without complex surface activation and cannot be cured at room temperature.
Some studies have introduced other groups to improve its adhesion to other substrates by modifying the surface of PTFE, or modifying the surface of PTFE to have a certain rough structure to achieve super-hydrophobic properties, but these processes require high equipment and process complex and difficult to apply

Method used

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  • Polyimide/polytetrafluoroethylene composite membrane for insulation of electric wire and cable and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] (1) 20g of 13X molecular sieve with a particle size of 20nm was washed with 0.1mol / L acetic acid solution and distilled water until the pH value was 6-7, and then dried in an oven at 180°C for 4h.

[0054] (2) Dissolve 0.02g of isopropyl triisostearate titanate coupling agent in 100ml of ethyl acetate solvent, add the 13X molecular sieve treated in step (1) while stirring, raise the temperature to 50°C, and react 1h, filter out molecular sieves. Next, the filtered 13X molecular sieve was first dried at 100° C. for 1 hour, and then further dried at 150° C. for 4 hours to obtain a 13X molecular sieve surface-modified by a coupling agent.

[0055] (3) Dissolve 0.008g of 13X molecular sieve surface-modified by coupling agent in 23.5g of DMF, then add 3.96g of 4,4'-diaminodiphenyl ether (ODA), after it is completely dissolved, add 4.36g of phenylene Tetraformic dianhydride (PMDA), stirred for 3 hours, and added 23.5 g of solvent toluene, and continued to stir for 0.5 hours ...

Embodiment 2

[0060] (1) 20g of 4A molecular sieve with a particle size of 30nm was washed with 0.1mol / L acetic acid solution and distilled water until the pH value was 6-7, and then dried in an oven at 180°C for 4h.

[0061] (2) Dissolve 0.2g of isopropyl triisostearate titanate coupling agent in 100ml of ethyl acetate solvent, add the 4A molecular sieve treated in step (1) while stirring, heat up to 54°C, and react 1h, filter out molecular sieves. Next, the filtered 4A molecular sieve was first dried at 100° C. for 1 hour, and then further dried at 150° C. for 4 hours to obtain a 4A molecular sieve surface-modified by the coupling agent.

[0062] (3) Dissolve 0.08g of 4A molecular sieve surface-modified by the coupling agent in 23.5g of NMP, then add 3.96g of 4,4'-diaminodiphenyl ether (ODA), after it is completely dissolved, add 4.36g of pyromellitic tetra Formic acid dianhydride (PMDA), stirred for 3 hours, and 23.5 g of solvent ethanol was added, and stirred for 0.5 hours to prepare p...

Embodiment 3

[0067] (1) 20g of 5A molecular sieve with a particle size of 50nm was washed with 0.1mol / L acetic acid solution and distilled water until the pH value was 6-7, and then dried in an oven at 180°C for 4h.

[0068] (2) Dissolve 0.4g of isopropyl tris(dioctylpyrophosphate acyloxy) titanate coupling agent in 100ml of ethyl acetate solvent, and add the 5A molecular sieve treated in step (1) while stirring , heated up to 50°C, reacted for 1h, and filtered out molecular sieves. Next, the filtered 5A molecular sieve was first dried at 100° C. for 1 hour, and then further dried at 150° C. for 4 hours to obtain a 5A molecular sieve surface-modified by the coupling agent.

[0069] (3) Dissolve 0.4g of 5A molecular sieve surface-modified by the coupling agent in 23.5g of NMP, then add 3.64g of 4,4'-diaminodiphenyl ether (ODA), after it is completely dissolved, add 4.36g of pyromellitic tetra Formic acid dianhydride (PMDA), stirred for 3 hours, and 23.5 g of solvent ethanol was added, and ...

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Abstract

The invention discloses a polyimide / polytetrafluoroethylene composite membrane for the insulation of electric wires and cables and a preparation method thereof. The preparation method comprises the following steps of firstly preparing a surface modified molecular sieve; then preparing a polyamic acid (PAA) / molecular sieve composite solution, and preparing the polyamic acid / molecular sieve composite solution into a polyimide / molecular sieve composite membrane; then coating the prepared polytetrafluoroethylene / molecular sieve complex liquid on both surfaces of the membrane to obtain the polyimide / polytetrafluoroethylene composite membrane for the insulation of the electric wires and the cables. The polyimide / polytetrafluoroethylene composite membrane disclosed by the invention has good adhesion of polyimide and polytetrafluoroethylene and solves the problem of poor adhesion between a polytetrafluoroethylene coating and other base bodies; the polyimide / polytetrafluoroethylene composite membrane for the insulation of the electric wires and the cables, which is disclosed by the invention, has the advantages of excellent mechanical property and good insulating property, can normally work in a humid environment with electrical property which is not affected under the condition that the polytetrafluoroethylene coating is damaged and has the characteristic of low dielectric constant.

Description

technical field [0001] The invention relates to a material for wire and cable insulation, in particular to a polyimide / polytetrafluoroethylene composite film for wire and cable insulation and a preparation method thereof, belonging to the field of wire and cable insulation materials. Background technique [0002] Polyimide (PI) is an aromatic heterocyclic polymer compound containing imide groups in the repeating unit. It is a special polymer characterized by high temperature resistance and radiation resistance. It has good mechanical properties, wear resistance, Dimensional stability, solvent resistance, etc., have been successfully used in aviation, aerospace and other cutting-edge technology fields, and have also been widely used in electronic appliances, mechanical and chemical industries. In order to adapt to the development of high technology, the research of PI is also moving towards the direction of high performance and multi-function. In the wire and cable productio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B27/08B32B27/28B32B27/30C08L79/08C08K9/04C08K7/26C08G73/10C08J5/18C09D127/18C09D7/12H01B7/02
Inventor 胡晖杨云飞张兆文聂伟黄雷郑凯航
Owner GUANGZHOU KAIHENG SPECIAL WIRE & CABLE
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