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Filling modified polytetrafluoroethylene and preparation method thereof

A technology of polytetrafluoroethylene and polytetrafluoroethylene resin is applied in the field of filling and modified polytetrafluoroethylene and its preparation, and can solve the problems of high density, poor swelling performance, poor interface compatibility and the like

Active Publication Date: 2021-05-18
成都希瑞方晓科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the interface compatibility between carbon nanotubes and polytetrafluoroethylene is poor, which makes it difficult for carbon nanotubes to disperse uniformly in polytetrafluoroethylene, which has a certain impact on the electrical conductivity and mechanical strength of filled modified materials.
In addition, the existing filled modified PTFE materials still have the problem of poor expansion performance, resulting in a generally high density of the material after expansion treatment

Method used

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Effect test

preparation example Construction

[0038] The present invention also provides a preparation method of filled modified polytetrafluoroethylene, comprising the following steps:

[0039] a) preparing resonance mixing powder; the ingredients of the resonance mixing powder include polytetrafluoroethylene resin, carbon nanotubes, fluorine-containing silane coupling agent and extrusion aid;

[0040] b) The resonance mixed powder is subjected to aging, molding extrusion, calendering, extrusion aid removal and stretching and puffing in sequence to obtain filled modified polytetrafluoroethylene.

[0041] In the preparation method provided by the present invention, the resonance mixing powder is first prepared, and the resonance mixing powder is obtained by resonance mixing of raw materials, and its specific components include polytetrafluoroethylene resin, carbon nanotubes, fluorine-containing silane coupling agents and extrusion aids. Wherein, the polytetrafluoroethylene resin is preferably a dispersed polytetrafluoroe...

Embodiment 1

[0056] A preparation method of filled modified polytetrafluoroethylene material, comprising the following steps:

[0057] 50g hydroxylated carbon nanotubes (TNDH, Chengdu Organic Chemistry Co., Ltd., Chinese Academy of Sciences), 1g 1H,1H,2H,2H-perfluorodecyltriethoxysilane (Nanjing Nengde New Material Co., Ltd.), 1000g disperse polymer Tetrafluoroethylene resin (601X, Daikin Fluorochemical) and 280g of extrusion aid (IsoparK, ExxonMobil) were added to the resonance mixer and mixed evenly, the mixing acceleration was 40G, and the time was 30min;

[0058] Seal the well-mixed mixed powder and put it in an oven at 45°C for 24 hours; mold the cured mixture for 3 minutes under a pressure of 3 MPa to form a cylindrical shape; extrude the molded product under a pressure of 8 MPa; calender the extruded product to a thickness of 1.5 mm tape; the calender is removed from the extrusion aid in an oven at 200°C for 5 minutes; it is stretched and expanded by 3 times in a stretching box at 2...

Embodiment 2

[0060] A preparation method of filled modified polytetrafluoroethylene material, comprising the following steps:

[0061] 1g 1H, 1H, 2H, 2H-perfluorodecyltriethoxysilane (Nanjing Nengde New Material Co., Ltd.), 280g extrusion aid (IsoparK, Exxon Mobil Corporation), 50g hydroxylated carbon nanotubes (TNDH, Chengdu Organic Chemistry Co., Ltd., Chinese Academy of Sciences) was put into the resonance mixer, the mixing acceleration was 40G, and the mixture was mixed for 15 minutes, then 1000g of dispersed polytetrafluoroethylene resin (601X, Daikin Fluorine Chemical Industry Co., Ltd.) was added and continued to mix for 30 minutes under the same mixing acceleration. ;

[0062] Seal the well-mixed mixed powder and put it in an oven at 45°C for 24 hours; mold the cured mixture for 3 minutes under a pressure of 3 MPa to form a cylindrical shape; extrude the molded product under a pressure of 8 MPa; calender the extruded product to a thickness of 1.5 mm tape; remove the extrusion aid ...

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Abstract

The invention belongs to the technical field of high polymer materials, and particularly relates to filling modified polytetrafluoroethylene and a preparation method thereof. The filling modified polytetrafluoroethylene provided by the invention is prepared from resonance mixed powder through curing, mould pressing extrusion, calendering, extrusion aid removal and stretching puffing; and the resonance mixed powder comprises the following components: polytetrafluoroethylene resin, carbon nanotubes, a fluorine-containing silane coupling agent and an extrusion aid. A resonance mixing technology is adopted to replace traditional high-speed mixing, so that fibration of polytetrafluoroethylene resin in the mixing process is avoided, and the puffing performance of the polytetrafluoroethylene resin-based material is improved; meanwhile, the fluorine-containing silane coupling agent is added, so that the interfacial compatibility of the carbon nanotubes and the polytetrafluoroethylene is remarkably improved, and the dispersion uniformity of the carbon nanotubes in the polytetrafluoroethylene is improved; and on the basis, a tensile expansion technology is combined to prepare the filling modified polytetrafluoroethylene material with high conductivity, high mechanical strength and low density.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a filled modified polytetrafluoroethylene and a preparation method thereof. Background technique [0002] Polytetrafluoroethylene (PTFE) has excellent properties such as high temperature resistance, corrosion resistance, non-stick, self-lubricating, high dielectric, low friction, etc., and can be made into tubes, rods, strips, plates, films, etc., in terms of performance requirements Highly corrosion-resistant pipes, containers, pumps, valves, and engineering plastics for radar, high-frequency communication equipment, radio equipment, etc. have a wide range of uses. [0003] In recent years, with the wide application of PTFE materials, in order to meet the market demand for PTFE materials with different properties, more and more filled modified PTFE materials have been developed. The common fillers are Carbon nanotubes, glass fibers, metals, metallized oxid...

Claims

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Application Information

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IPC IPC(8): C08L27/18C08K9/06C08K3/04
CPCC08K9/06C08K3/041C08K2201/011C08K2201/001C08L27/18
Inventor 李海兵郑淦休何锐
Owner 成都希瑞方晓科技有限公司
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