PTFE multi-layer extrusion pipe and preparation method thereof

A multi-layer extrusion, PTFE technology, applied in chemical instruments and methods, layered products, tubular articles, etc., can solve the problem of not being able to obtain a two-layer structure with inner black and outer white, achieve a good competitive advantage, reduce manufacturing Cost, effect of improving wear resistance

Active Publication Date: 2020-04-28
SHANDONG DONGYUE POLYMER MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the prior art, there have been reports on the preparation method of PTFE multilayer pipes. For example, Chinese patent document CN201410031403 discloses a production method for the integral molding of multilayer polytetrafluoroethylene pipes. However, the height of the green body after preforming in the previous process is about One-third of the height of the resin powder before preforming, so that when the tube blank formed by the previous preforming process in the latter process is used as the female mold to add resin powder, the resin powder of the latter process will be mixed into the preformed tube of the previous process In the billet, the two-layer structure of inner black and outer white cannot be obtained

Method used

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  • PTFE multi-layer extrusion pipe and preparation method thereof

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Effect test

Embodiment 1

[0035] A kind of preparation method of PTFE multi-layer extruded pipe, comprises steps as follows:

[0036] (1) Mixing and preforming of the inner layer material: Mix 15wt% PPS resin and 85wt% PTFE dispersion resin DF-2041 (Dongyue Group) after sieving to obtain a modified PTFE dispersion resin, add Mobil The addition of isopar G additive oil is 17wt% of the modified PTFE dispersion resin, and then placed on the mixing equipment and mixed at a speed of 30r / min for 30min, and the mixed inner layer material was placed in an environment of 25°C for 24h , using a cylinder with an outer diameter of 30mm for preforming, the preforming pressure is 2.0MPa, and the holding time is 20min to obtain the inner layer material ring body;

[0037] (2) Mixing and preforming of the outer layer material: add isopar G to the sieved PTFE dispersion resin DF-2041 (Dongyue Group), the amount of isopar G added is 17wt of the sieved PTFE dispersion resin %, put it on the mixing equipment and mix it a...

Embodiment 2

[0041] A kind of preparation method of PTFE multi-layer extruded pipe, comprises steps as follows:

[0042](1) Mixing and preforming of the inner layer material: Mix 10wt% PEEK resin and sieved 90wt% PTFE dispersion resin DF-2041 (Dongyue Group) evenly to obtain a modified PTFE dispersion resin, add Mobil's The addition of isopar G additive oil is 19wt% of the modified PTFE dispersion resin, and then placed on the mixing equipment and mixed at a speed of 30r / min for 30min, and the mixed inner layer material was placed in an environment of 25°C for 28h , using a cylinder with an outer diameter of 35mm for preforming, the preforming pressure is 2.5MPa, and the holding time is 30min to obtain the inner layer material ring blank;

[0043] (2) Mixing and preforming of the outer layer material: add isopar G to the sieved PTFE dispersion resin DF-2041 (Dongyue Group), the amount of isopar G added is 19wt of the sieved PTFE dispersion resin %, put it on the mixing equipment and mix i...

Embodiment 3

[0047] A kind of preparation method of PTFE multi-layer extruded pipe, comprises steps as follows:

[0048] (1) Mixing and preforming of the inner layer material: Mix 25wt% PI resin and 75wt% PTFE dispersion resin DF-2041 (Dongyue Group) after sieving to obtain a modified PTFE dispersion resin, add Mobil The addition of isopar G additive oil is 20wt% of the modified PTFE dispersion resin, then placed on the mixing equipment and mixed at a speed of 30r / min for 30min, and the mixed inner layer material was placed in an environment of 30°C for 24h , using a cylinder with an outer diameter of 50mm for preforming, the preforming pressure is 3.0MPa, and the pressure holding time is 35min to obtain the inner layer material ring body;

[0049] (2) Mixing and preforming of the outer layer material: add isopar G to the sieved PTFE dispersion resin DF-2041 (Dongyue Group), the amount of isopar G added is 20wt of the sieved PTFE dispersion resin %, put it on the mixing equipment and mix ...

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Abstract

The invention relates to a PTFE multilayer extrusion pipe and a preparation method thereof. The preparation method comprises the following steps: respectively preforming an inner-layer green body andan outer-layer green body of the PTFE multi-layer extrusion pipe, then putting the inner-layer green body into the central part of the outer-layer green body, applying certain pressure to form a preformed green body of the PTFE multi-layer extrusion pipe, and extruding, drying and sintering to obtain the PTFE multi-layer extrusion pipe with good wear resistance. The PTFE multi-layer extrusion pipeadopts a two-layer structure, the inner layer is a modified PTFE wear-resistant layer with one or a mixture of two of thermoplastic resin PPS, PES, PAI, PI and PEEK with good wear resistance, and theouter layer is a pure PTFE layer so that the performance of the PTFE of the outer layer is not influenced, the wear resistance of the inner layer is improved and the manufacturing cost is reduced. The manufacturing process is simple, repeatability is good, performance is stable, and the problem that a pure PTFE extrusion pipe is poor in wear resistance is solved.

Description

technical field [0001] The invention relates to a PTFE multilayer extruded pipe and a preparation method thereof, belonging to the technical field of PTFE pipe processing and manufacturing. Background technique [0002] PTFE, or polytetrafluoroethylene, known as the "King of Plastics", is the main variety of fluoroplastics, and its output exceeds 60% of the world's total fluoroplastics output. Because PTFE has comprehensive properties such as excellent chemical stability, high and low temperature resistance, lubricity, non-stickiness, excellent dielectric properties and excellent friction coefficient, PTFE is widely used in aerospace, petrochemical, machinery, electronics, communications, etc. , construction, textile and other fields. [0003] PTFE extruded tubes made of PTFE can be used for insulating sleeves, piping linings, heat exchanger tubes, etc. However, while PTFE extruded tubes have many excellent characteristics, they also have some disadvantages. For example, b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/06B32B27/20B32B27/32B32B1/08B29C48/09B29C48/18
CPCB32B1/08B32B27/08B32B27/20B32B27/322B32B2270/00B32B2307/206B32B2307/306B32B2307/554B32B2597/00B29C48/09B29C48/18
Inventor 陈越韩桂芳刘长海胡珂付师庆
Owner SHANDONG DONGYUE POLYMER MATERIAL
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