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A kind of polytetrafluoroethylene resin and its preparation method and application

A polytetrafluoroethylene and tetrafluoroethylene technology, applied in the field of polytetrafluoroethylene resin and its preparation, can solve the problems of low porosity, uneven stretching, and wide molecular weight distribution of stretched films, and achieve excellent physical isolation effect. , Improve the efficiency of initiation, the effect of narrow molecular weight distribution

Active Publication Date: 2022-07-08
ZHONGHAO CHENGUANG RES INST OF CHEMICALINDUSTRY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Conventional polytetrafluoroethylene dispersion resin is biaxially stretched, because the molecular weight of the resin is too low, the molecular weight distribution is wide, there are problems such as large pore size, poor filtration effect, etc. , there are problems of uneven stretching, such as low porosity of the stretched film, uneven pore size, etc.

Method used

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  • A kind of polytetrafluoroethylene resin and its preparation method and application

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Effect test

Embodiment 1

[0033] Embodiment 1 provides a kind of preparation method of polytetrafluoroethylene resin, and the concrete operation steps are as follows, wherein the total feeding amount of tetrafluoroethylene monomer is 3.5kg:

[0034] (1) In a 10L stainless steel autoclave equipped with a jacket and stirring, add 5L high-purity deionized water, 100g solid paraffin, 0.38g succinic acid, 3.8g ammonium perfluorohexanoate, 0.75g concentrated sulfuric acid (concentrated H in sulfuric acid 2 SO 4 The mass fraction is 98%), 0.04 g of ammonium persulfate, cover the kettle lid, start stirring, the stirring speed is 70 rpm, vacuumize, and replace with nitrogen. Until the oxygen content is less than 30ppm, control the temperature in the kettle to 60°C, add 0.01g of sodium sulfite, continuously feed high-purity tetrafluoroethylene monomer, control the reaction pressure to 2.8MPa, start the reaction, and control the temperature to rise slowly and evenly during the reaction process. 70℃;

[0035] (...

Embodiment 2

[0038] Embodiment 2 provides a kind of preparation method of polytetrafluoroethylene resin, and the concrete operation steps are as follows, wherein the total feeding amount of tetrafluoroethylene monomer is 3.0kg:

[0039] (1) In a 10L stainless steel autoclave equipped with a jacket and stirring, add 5L high-purity deionized water, 50g solid paraffin, 0.25g succinic acid, 2.5g ammonium perfluorohexanoate, 0.5g concentrated sulfuric acid (concentrated H in sulfuric acid 2 SO 4 The mass fraction is 98%), 0.03 g of ammonium persulfate, cover the kettle lid, start stirring, the stirring speed is 70 rpm, vacuumize, and replace with nitrogen. Until the oxygen content is less than 30ppm, control the temperature in the kettle to 60°C, add 0.005g sodium sulfite, continuously feed high-purity tetrafluoroethylene monomer, control the reaction pressure to 2.8MPa, start the reaction, and control the temperature to rise slowly and evenly during the reaction process. 70℃;

[0040] (2) w...

Embodiment 3

[0043] Embodiment 3 provides a kind of preparation method of polytetrafluoroethylene resin, and the concrete operation steps are as follows, wherein the total feeding amount of tetrafluoroethylene monomer is 4.5kg:

[0044] (1) In a 10L stainless steel autoclave equipped with a jacket and stirring, add 5L high-purity deionized water, 150g solid paraffin, 0.5g succinic acid, 5.0g ammonium perfluorohexanoate, 1.0g concentrated sulfuric acid (concentrated H in sulfuric acid 2 SO 4 The mass fraction is 98%), 0.05g ammonium persulfate, cover the kettle lid, turn on stirring, the stirring speed is 70rpm, vacuumize, and replace with nitrogen. Until the oxygen content is less than 30ppm, control the temperature in the kettle to 60°C, add 0.01g of sodium sulfite, continuously feed high-purity tetrafluoroethylene monomer, control the reaction pressure to 3.0MPa, start the reaction, and control the temperature to rise slowly and evenly during the reaction process. 70℃;

[0045] (2) wh...

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Abstract

The invention relates to a polytetrafluoroethylene resin and a preparation method and application thereof. The preparation method comprises the following steps: adding deionized water, an oxidant, a dispersant, an acid agent, a stabilizer and a pH adjuster in advance to a reaction kettle , add a reducing agent, and continuously put in the gas phase tetrafluoroethylene monomer for stirring reaction; when the tetrafluoroethylene monomer feeding amount reaches 5-15% of the total amount, stop stirring, start stirring after a certain period of time, and put it into the reaction kettle The reducing agent is added until the feeding amount of tetrafluoroethylene monomer reaches 75-85% of the total amount. After feeding, a polytetrafluoroethylene dispersion liquid with a solid content of 25-35% is obtained. After coagulation and drying, polytetrafluoroethylene is obtained. vinyl. The polytetrafluoroethylene resin produced by the preparation method provided by the invention is biaxially stretched to make a porous membrane, and the filtration efficiency of dust with a diameter of 0.3 μm reaches 99%, which has excellent physical isolation effect and can be used in medical fields such as masks.

Description

technical field [0001] The invention relates to the field of polymer materials, in particular to a polytetrafluoroethylene resin and a preparation method and application thereof. Background technique [0002] PTFE has excellent chemical corrosion resistance, high and low temperature resistance, aging resistance, low friction, non-stickiness, and physiological inertia. It is used in chemical, mechanical, electrical, medical and other fields and has become an indispensable special material. Among them, the polytetrafluoroethylene polymer solution is concentrated and processed to obtain an emulsion, and the solid content of the emulsion is controlled at 40-60%. It can be used for carrier spinning to make fiber woven pads, glass fiber cloth fabrics and porous metal dipping and sintering to form films or make metal coatings and coating of other substrates, etc.; the polytetrafluoroethylene polymer solution can also be subjected to a coagulation process, and various fillers, such ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F114/26C08F4/40C08J5/18B01D46/00B01D46/54A41D31/04C08L27/18
CPCC08F114/26C08F4/40C08J5/18B01D46/543B01D46/0001A41D31/04C08J2327/18A41D2500/52
Inventor 姚权卫苏小龙周云峰李慧张春静
Owner ZHONGHAO CHENGUANG RES INST OF CHEMICALINDUSTRY CO LTD