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Fusible fluorine-containing resin and preparation method thereof

A technology of fluorine-containing resin and content, applied in the field of fusible fluorine-containing resin and its preparation, can solve the problems of large number of end groups, limited use of fusible tetrafluoride, adverse environmental impact, etc., and meets the requirements of appearance quality, The effect of increasing melt processability and reducing thermal instability index

Active Publication Date: 2022-04-22
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

However, in the production of emulsion, due to the instability of polymer end groups, appropriate end group stabilization treatment methods are required, and the post-treatment process is complicated, which limits the use of fusible tetrafluoroethylene.
[0004] CN1151994A discloses a preparation method of tetrafluoroethylene terpolymer, which is mainly used for resin extrusion processing, adopts TFE / HFP / PEVE ternary copolymerization, the polymerization pressure is high, reaching 4.2MPa, and the gained polymer resin has better Excellent flexural properties, but the final resin cannot meet the processing requirements of melt extrusion
[0005] CN106519100A discloses a preparation method of fusible polytetrafluoroethylene, which is characterized in that solvent, tetrafluoroethylene, perfluoroalkyl vinyl ether and chain transfer agent are added to the polymerization kettle in a certain proportion, and the initiator is added when the temperature is raised. Start the reaction, keep the pressure constant by adding tetrafluoromonomer, when the predetermined amount is reached, continue to add hot deionized water and initiator to the kettle, and heat up and keep warm while stirring to obtain solid materials, which are filtered, washed and dried Fusible polytetrafluoroethylene powder is obtained. The particle size of the powder obtained by the patent application is uniform, and the number of unstable end groups is reduced. However, the patent application uses a large amount of restricted organic solvents in the production process, such as F113, etc. It is easy to cause adverse effects on the environment, and at the same time, the number of unstable end groups is still too large. If it is directly melted and extruded, there will be problems such as gray appearance and bubbles in the product.
[0006] CN100503669C discloses a method for producing meltable tetrafluoroethylene / fluorinated vinyl ether copolymers by suspension polymerization, which is copolymerized in pressurized and stirred reactors of water, free radical initiators, and telomers, without using Fluorine organic solvent, directly obtain solid copolymer after the reaction, this method does not use surfactant and solvent, and can be easily separated to obtain solid product, but the product has a large number of unstable end groups, and direct melt extrusion will cause the appearance of the product There are problems such as graying and bubbles

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  • Fusible fluorine-containing resin and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] This embodiment provides a kind of preparation method of fusible fluorine-containing resin as follows:

[0048] In a 5L stainless steel autoclave equipped with jacket and stirring, add 2.8L deionized water, 84g solid paraffin, 8.4g ammonium carbonate, 2.8g ammonium perfluorooctanoate, start stirring, vacuumize, and replace with nitrogen until the oxygen content is less than 30ppm , control the temperature in the kettle to 68°C, add 8.4g dichloromethane, 84g perfluoropropyl vinyl ether, 5.6g hexafluoropropylene, 1.4g (perfluorobutyl) ethylene, 0.36g ammonium persulfate initiator, and Feed tetrafluoroethylene monomer, control the reaction pressure to 2.0MPa to start the reaction, control the maximum temperature in the kettle to 70°C during the reaction, stop the reaction after 5.5 hours of reaction, and obtain a polymer emulsion with a solid content of 29%.

[0049] Add deionized water to the polymerized emulsion to adjust the solid content to 15%, add 120g of ammonium ca...

Embodiment 2

[0051] This embodiment provides a kind of preparation method of fusible fluorine-containing resin as follows:

[0052] In a 5L stainless steel autoclave equipped with jacket and stirring, add 2.8L deionized water, 28g solid paraffin, 2.8g ammonium carbonate, 1.4g ammonium perfluorooctanoate, start stirring, vacuumize, and replace with nitrogen until the oxygen content is less than 30ppm , control the temperature in the kettle to 60°C, add 2.8g dichloromethane, 28g perfluoropropyl vinyl ether, 16.8g hexafluoropropylene, 4.2g (perfluorohexyl) ethylene, 0.084g ammonium persulfate initiator, and pass Add tetrafluoroethylene monomer, control the reaction pressure to 1.0MPa to start the reaction, and stop the reaction after 4.5 hours to obtain a polymer emulsion with a solid content of 20%.

[0053] Add deionized water to the polymer emulsion to adjust the solid content to 5%, add 50g of ammonium carbonate, carry out mechanical agitation and coagulation operation, add deionized wate...

Embodiment 3

[0055] This embodiment provides a kind of preparation method of fusible fluorine-containing resin as follows:

[0056] In a 5L stainless steel autoclave equipped with jacket and stirring, add 2.8L deionized water, 84g solid paraffin, 8.4g ammonium carbonate, 2.8g sodium perfluorooctanoate, start stirring, vacuumize, and replace with nitrogen until the oxygen content is less than 30ppm , control the temperature in the kettle to 65°C, add 4.2g dichloromethane, 28g perfluoropropyl vinyl ether, 16.8g hexafluoropropylene, 4.2g (perfluorobutyl) ethylene, 0.3g ammonium persulfate initiator, and Feed tetrafluoroethylene monomer, control the reaction pressure to 1.5 MPa to start the reaction, and stop the reaction after 4.5 hours to obtain a polymer emulsion with a solid content of 20%.

[0057] Add deionized water to the polymerized emulsion to adjust the solid content to 5%, add 50g of ammonium carbonate, carry out mechanical agitation and coagulation operation, add deionized water t...

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Abstract

The invention provides a fusible fluorine-containing resin and a preparation method thereof, and the preparation method comprises the following steps: carrying out a copolymerization reaction on tetrafluoroethylene, non-tetrafluoroethylene perhaloolefin, perfluoroalkyl ethylene and perfluoroalkyl vinyl ether to obtain a polymerization liquid containing the fusible fluorine-containing resin. The fusible fluorine-containing resin provided by the invention is uniform in particle size and relatively low in thermal instability index, end group treatment is not required in a post-treatment process, and the fusible fluorine-containing resin can be directly subjected to melt extrusion molding.

Description

technical field [0001] The invention relates to the technical field of fluorine-containing resin production and processing, and relates to a fusible fluorine-containing resin and a preparation method thereof. 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. , to replace the traditional materials in the past, but its high melt viscosity prevents it from being melt-processed, while tetrafluoroethylene-hexafluoropropylene copolymers, tetrafluoroethylene-perfluoroalkyl vinyl ether copolymers, etc. Thermoplastics that have a low melt viscosity and can be melt processed. [0003] The general-purpose fusible PTFE emulsion and fusible PTFE for wire and cable can be obtained by using the emulsion polymeri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F214/26C08F216/14C08F214/28C08F214/18C08F2/26
CPCC08F214/262C08F2/26C08F216/1408C08F214/282C08F214/184
Inventor 姚权卫张春静苏小龙周云峰
Owner ZHONGHAO CHENGUANG RES INST OF CHEMICALINDUSTRY CO LTD