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A kind of polytetrafluoroethylene material with low coefficient of linear expansion and having adhesive property and preparation method thereof

A polytetrafluoroethylene, linear expansion coefficient technology, used in film/sheet adhesives, adhesives, films/sheets without carriers, etc., can solve the problems of plastic deformation, large expansion coefficient, non-stickiness, etc. The effect of uniform molecular weight distribution, simple synthesis process and controllable relative molecular weight

Active Publication Date: 2021-07-23
上海嘉诺密封技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This invention still has the disadvantages of plastic deformation, non-stickiness and large expansion coefficient under long-term continuous load

Method used

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  • A kind of polytetrafluoroethylene material with low coefficient of linear expansion and having adhesive property and preparation method thereof
  • A kind of polytetrafluoroethylene material with low coefficient of linear expansion and having adhesive property and preparation method thereof

Examples

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Effect test

Embodiment 1

[0022] A kind of preparation method of polytetrafluoroethylene material with low coefficient of linear expansion and stickiness, in parts by weight, comprises the steps:

[0023] In an oxygen-free closed reactor, add 180 parts of water, 30 parts of n-butanol, 6 parts of glycidyl acrylate, 4 parts of 1,6-hexylbismaleimide, 4 parts of perfluorododecane Sodium phenyl sulfonate, 2 parts of polyacrylamide 6000, 1 part of azobisisoamyl imidazoline, 0.1 part of S,S'-bis(α,α'-dimethyl-α"-acetic acid) trithio Carbonate, start the agitator to disperse evenly to obtain a liquid phase, control the liquid phase to account for 15% of the reactor volume; then increase the stirring speed to 1400r / min to atomize the liquid phase in the reactor; Add tetrafluoroethylene, stop feeding tetrafluoroethylene when the pressure of the kettle is 3MPa; then keep the stirring speed at 1400r / min, heat the temperature inside the reactor to 100°C, and the reactor is connected with constant pressure nitrogen ...

Embodiment 2

[0026] A kind of preparation method of polytetrafluoroethylene material with low coefficient of linear expansion and stickiness, in parts by weight, comprises the steps:

[0027] In an oxygen-free closed reactor, add 150 parts of water, 40 parts of N,N-diethylformamide, 4 parts of hydroxyethyl methacrylate, 6 parts of p-phenylbismaleimide, 3 parts Add perfluorohexadecyltrimethylammonium bromide, 3 parts of polyvinylpyrrolidone, 0.8 parts of azobisisoheptyl imidazoline, 0.2 parts of α-dithiobenzyl p-benzylidene chloride Pyridinium salt, start the agitator to disperse evenly to obtain a liquid phase, control the liquid phase to account for 12% of the volume of the reactor; then increase the stirring speed to 1600r / min to atomize the liquid phase in the reactor; Add tetrafluoroethylene, stop feeding tetrafluoroethylene when the pressure of the kettle is 2.5MPa; then keep the stirring speed at 1600r / min, heat the temperature in the reactor to 90°C, and the reactor is connected wit...

Embodiment 3

[0030] A kind of preparation method of polytetrafluoroethylene material with low coefficient of linear expansion and stickiness, in parts by weight, comprises the steps:

[0031] In an oxygen-free closed reactor, add 130 parts of water, 50 parts of dimethyl sulfoxide, 3 parts of hydroxyisopropyl acrylate, and 8 parts of N,N'-(4,4'-methylenediphenyl) Bismaleimide, 2 parts of sodium perfluorooctyl carboxylate, 4 parts of polyethylene glycol 8000, 0.5 part of azodicyanovaleric acid, 0.3 part of dithiophenylacetic acid, and start the mixer to disperse evenly to obtain Liquid phase, control the liquid phase to account for 10% of the volume of the reactor; then the stirring speed is raised to 1800r / min to atomize the liquid phase in the reactor; Stop feeding tetrafluoroethylene at 2MPa; then keep the stirring speed at 1800r / min, heat the temperature in the reactor to 70°C, and keep the reactor pressure at 2MPa by connecting the reactor with constant pressure nitrogen during the whol...

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Abstract

The invention relates to a sticky polytetrafluoroethylene material with a low linear expansion coefficient and a preparation method thereof. The polytetrafluoroethylene material of the invention is modified by a bismaleimide monomer, and the bismaleimide The rigidity reduces its plastic deformation under continuous load, and the effect of bismaleimide and tackifier monomer makes the polytetrafluoroethylene material have a certain bonding force with plastics, metals, etc., and its heat resistance Performance etc. are still maintained. The invention adds RAFT reagent and is synthesized by living free radical polymerization, and the relative molecular weight of the prepared polytetrafluoroethylene material is controllable, the molecular weight distribution is uniform, and the synthesis process is simple, which is easy to realize industrialization.

Description

technical field [0001] The invention relates to a polytetrafluoroethylene material, in particular to a polytetrafluoroethylene material with a low linear expansion coefficient and an adhesive property and a preparation method thereof, belonging to the technical field of polymer materials. Background technique [0002] Polytetrafluoroethylene (Polytetrafluoroethylene, abbreviated as PTFE), also known as Teflon, since Dr. Roy Plunkett of DuPont Company in the United States accidentally obtained polytetrafluoroethylene in 1938, polytetrafluoroethylene is known for its unparalleled chemical resistance and excellent chemical resistance. Excellent electrical insulation performance, low dielectric constant, extremely low friction coefficient and long-term use in the temperature range of -180 ~ 260 ° C have become a pearl in the field of polymer materials. [0003] But PTFE still has many deficiencies, for example: 1. PTFE has "cold flow". That is, the plastic deformation (creep) o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F214/26C08F220/32C08F222/40C08F220/20C09J7/10C09J7/30
CPCC08F214/265C08F220/20C08F222/40C09J2427/00C09J7/10C09J7/30C08F220/325
Inventor 万章文曹冰
Owner 上海嘉诺密封技术有限公司
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