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Polytetrafluoroethylene for extruded tubes and preparation method of polytetrafluoroethylene

A polytetrafluoroethylene and tetrafluoroethylene technology, applied in the field of organic polymer compounds, can solve the problems of extruded pipe transparency, poor strength, complicated operation, long reaction time, etc., and achieve high resin molecular weight, simple operation, and improved flexibility. sexual effect

Active Publication Date: 2021-03-30
ZHONGHAO CHENGUANG RES INST OF CHEMICALINDUSTRY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But this method has the problems that the reaction time is longer, the operation is complicated, and the transparency and strength of the extruded tube are worse than those of the present invention.

Method used

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  • Polytetrafluoroethylene for extruded tubes and preparation method of polytetrafluoroethylene
  • Polytetrafluoroethylene for extruded tubes and preparation method of polytetrafluoroethylene

Examples

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Comparison scheme
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Embodiment 1

[0029] This embodiment relates to a preparation method of polytetrafluoroethylene for pipe extrusion, comprising the following steps:

[0030] 1) Clean the 50L stainless steel reaction kettle, add 32L of deionized water, 8g of ammonium perfluorooctanoate as a dispersant, and 2kg of paraffin, then seal the kettle, evacuate and replace with nitrogen, and analyze the oxygen content. When the oxygen content is less than or equal to 30ppm, it is qualified. Add 55g of modifier A perfluoropropyl vinyl ether (PPVE) at one time through the metering pump, the temperature of the reaction kettle is raised to 74±1°C, the gas phase monomer tetrafluoroethylene is put in, and the pressure in the kettle is 1.6MPa, and the initiator is added Oxidize 25g of succinic acid (pure), and start the polymerization reaction in the early stage. During the reaction, the pressure in the kettle is maintained at 1.6MPa, and the temperature is 75-80°C. According to the change of the polymerization speed, the ...

Embodiment 2

[0033] A method for preparing a polytetrafluoroethylene dispersed resin differs from Example 1 only in that the polymerization pressure in the early stage is 1.3 MPa, and the polymerization pressure in the later stage is 2.3 MPa. In this way, polytetrafluoroethylene dispersion resin was prepared.

Embodiment 3

[0035] A method for preparing a polytetrafluoroethylene dispersed resin differs from Example 1 only in that the polymerization pressure in the early stage is 1.8 MPa, and the polymerization pressure in the later stage is 2.8 MPa. In this way, polytetrafluoroethylene dispersion resin was prepared.

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PUM

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Abstract

The invention relates to the field of organic polymer compounds, in particular to polytetrafluoroethylene resin for extruded tubes and a preparation method of the polytetrafluoroethylene resin, and has the main improvements that in the preparation process, polymerization reaction is carried out in two stages, namely polymerization is carried out at low pressure in the earlier stage and polymerization is carried out at high pressure in the later stage; and a modifier A and a modifier B are respectively added in the early stage and the later stage in the polymerization process. The transparent high-strength polytetrafluoroethylene dispersion resin obtained by the method is used for pasty push-extrusion processing of pipes, and the obtained product has the characteristics of straightness, smoothness, continuity, good transparency, good appearance, high strength and the like.

Description

technical field [0001] The invention relates to the field of organic polymer compounds, in particular to a preparation method of a fluorine-containing organic compound and a prepared polytetrafluoroethylene resin. Background technique [0002] The excellent chemical corrosion resistance, high and low temperature resistance, aging resistance, low friction, non-stickiness, and physiological inertia of PTFE make it an indispensable special material in the fields of chemical industry, machinery, electrical, construction, and medical treatment. , it can be used for a long time in the temperature range of -250 ~ 250 ℃. The preparation of extruded polytetrafluoroethylene resin began to be studied in the 1940s. It is a major branch of polytetrafluoroethylene resin. With the advancement of dispersed resin molding processing technology and the widening of the application range of polytetrafluoroethylene resin, Promote the continuous improvement of extruded PTFE dispersion resin quali...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F214/26C08F214/18C08F216/14
CPCC08F214/262C08F214/184C08F216/1408C08F2500/01C08F2500/03
Inventor 苏小龙胡显权姚权卫张春静周云峰
Owner ZHONGHAO CHENGUANG RES INST OF CHEMICALINDUSTRY CO LTD
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