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A kind of polytetrafluoroethylene graft film and preparation method thereof

A technology of polytetrafluoroethylene and film, which is applied in the field of polytetrafluoroethylene grafted film and its preparation, can solve the problems of limited improvement of surface free energy and complicated treatment, and achieve simple post-processing steps and simple reaction system Effect

Active Publication Date: 2021-02-12
ZHEJIANG DEQING CONCEPTFE PLASTIC PROD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the use of acrylic acid to carry out graft modification still has the following disadvantages: (1) the prior art generally grafts two-dimensional chain polymers such as acrylic acid on the surface of polytetrafluoroethylene film, but the chain polymer has a negative effect on the polytetrafluoroethylene film. The improvement effect of the surface free energy of tetrafluoroethylene thin film is limited; (2) prior art usually needs to introduce peroxyl free radical by exposing thin film in air after plasma treatment, adopts the mode that free radical initiates to realize surface grafting, this This method makes the post-grafting treatment of the surface more complicated

Method used

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  • A kind of polytetrafluoroethylene graft film and preparation method thereof

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Effect test

Embodiment 1

[0030] The preparation method of a kind of polytetrafluoroethylene graft film of the present embodiment comprises the following steps:

[0031] (1) Put the polytetrafluoroethylene powder into a mold for cold pressing, then sinter in a sintering furnace at 370-390°C, and turn the sintered green body into a 0.01-10mm polytetrafluoroethylene film on a rotary cutter;

[0032] The polytetrafluoroethylene film can also be selected from commercially available ready-made polytetrafluoroethylene films;

[0033] Put the polytetrafluoroethylene film in the plasma treatment equipment for single-sided or double-sided plasma treatment, the treatment power is 100W, and the treatment time is 90s;

[0034] (2) Place the plasma-treated polytetrafluoroethylene film in the reactor, feed nitrogen into the reactor to discharge oxygen, after the oxygen is exhausted, feed anhydrous tetrahydrofuran, N-(benzene and cyclobutene-4-yl) the mixed solution of maleimide and acrylic acid, the feed rate of th...

Embodiment 2

[0038] The preparation method of a kind of polytetrafluoroethylene graft film of the present embodiment comprises the following steps:

[0039] (1) Put the polytetrafluoroethylene powder into a mold for cold pressing, then sinter in a sintering furnace at 370-390°C, and turn the sintered green body into a 0.01-10mm polytetrafluoroethylene film on a rotary cutter;

[0040] The polytetrafluoroethylene film can also be selected from commercially available ready-made polytetrafluoroethylene films;

[0041]Put the polytetrafluoroethylene film in the plasma treatment equipment for single-sided or double-sided plasma treatment, the treatment power is 100W, and the treatment time is 90s;

[0042] (2) Place the plasma-treated polytetrafluoroethylene film in the reactor, feed nitrogen into the reactor to discharge oxygen, after the oxygen is exhausted, feed anhydrous tetrahydrofuran, N-(benzene and cyclobutene-4-yl) the mixed solution of maleimide and acrylic acid, the feed rate of the...

Embodiment 3

[0046] The preparation method of a kind of polytetrafluoroethylene graft film of the present embodiment comprises the following steps:

[0047] (1) Put the polytetrafluoroethylene powder into a mold for cold pressing, then sinter in a sintering furnace at 370-390°C, and turn the sintered green body into a 0.01-10mm polytetrafluoroethylene film on a rotary cutter;

[0048] The polytetrafluoroethylene film can also be selected from commercially available ready-made polytetrafluoroethylene films;

[0049] Put the polytetrafluoroethylene film in the plasma treatment equipment for single-sided or double-sided plasma treatment, the treatment power is 100W, and the treatment time is 90s;

[0050] (2) Place the plasma-treated polytetrafluoroethylene film in the reactor, feed nitrogen into the reactor to discharge oxygen, after the oxygen is exhausted, feed anhydrous tetrahydrofuran, N-(benzene and cyclobutene-4-yl) the mixed solution of maleimide and acrylic acid, the feed rate of th...

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Abstract

The invention discloses a polytetrafluoroethylene grafted membrane and a preparation method thereof. The preparation method comprises the following steps: (1) performing plasma treatment on a polytetrafluoroethylene thin film; (2) under the protection of nitrogen, putting the polytetrafluoroethylene thin film subjected to plasma treatment into mixed liquid composed of anhydrous tetrahydrofuran, N-(benzocyclobutene-4-radical) maleimide and acrylic acid, and generating reaction under ultraviolet irradiation, thus obtaining the polytetrafluoroethylene grafted membrane. According to the polytetrafluoroethylene grafted membrane disclosed by the invention, surface grafting is realized by adopting an ultraviolet initiation mode, so that the step of introducing peroxy radicals is omitted; furthermore, the N-(benzocyclobutene-4-radical) maleimide is a light initiator and a polymerization monomer, so no extra light initiator is needed, and the reaction system is simpler and the post-treatment steps are simpler and more convenient; the surface of the polytetrafluoroethylene thin film is grafted to form a three-dimensional meshed high polymer, so that the surface activity of the polytetrafluoroethylene thin film is further improved, and the surface free energy of the polytetrafluoroethylene thin film is enhanced.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a polytetrafluoroethylene grafted film and a preparation method thereof. Background technique [0002] Polytetrafluoroethylene (PTFE) has excellent properties such as high and low temperature resistance, chemical corrosion resistance and radiation resistance. It is widely used in petroleum, chemical and pharmaceutical fields. It is an indispensable element for solving many key sealing problems in modern science and technology. The lack of materials, but its non-stick surface makes its application limited. Modifying the surface of PTFE film can improve the surface properties of PTFE film to varying degrees, improve its adhesion and wettability, and increase the surface free energy of PTFE film. [0003] Plasma technology can change the surface properties of polymer films in a short period of time without affecting the properties of the bulk phase of the mate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J7/18C08J7/12C08L27/18
CPCC08J7/123C08J7/18C08J2327/18
Inventor 吴晓明邱剑锷邓赛明
Owner ZHEJIANG DEQING CONCEPTFE PLASTIC PROD
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