Polymerization process for increasing stability of fluorinated ethylenepropylene copolymer resin end group

A technology for the stability of polyperfluoroethylene propylene, which is applied in the field of polymerization technology to increase the stability of polyperfluoroethylene propylene resin end groups, and can solve the problems of unstable polymer end groups, difficult post-processing of materials, and high reaction pressure. Achieve the effects of reducing energy consumption, reducing investment in equipment purchase funds, and low polymerization pressure

Active Publication Date: 2011-04-06
SHANDONG HUAXIA SHENZHOU NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this polymerization is that the reaction pressure is high and the end group of the polymer is unstable, which not only brings difficulties to the post-processing of materials, but also limits its application in high-tech fields.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Before carrying out the copolymerization reaction, use a nitrogen gauge pressure equal to 1.5 times the reaction pressure but not greater than the allowable pressure of the reactor to check the tightness of the reactor. Under the condition of stirring, the pressure should not decrease within 1 hour, then release the nitrogen to the atmosphere to 0.02-0.07MPa and evacuate to a residual pressure of 3-9mmHg, and stop stirring and vacuuming under vacuum for 10-15min, here There should be no change in vacuum during this period.

[0030] The ingredients of the mixing tank: the mixing tank is divided into an initial tank and an additional tank, and the ratio of tetrafluoroethylene: hexafluoropropylene in the initial tank is 1:2 (weight ratio), which is called the initial monomer mixture; the additional tank The ratio of tetrafluoroethylene: hexafluoropropylene is 8:1 (weight ratio), which is called feeding monomer mixture. Addition amount: the initial monomer mixture is 2kg, ...

Embodiment 2

[0034] Reactor tightness detection is the same as Example 1.

[0035] The ingredients of the mixing tank: the mixing tank is divided into two initial tanks and supplementary tanks, the ratio of tetrafluoroethylene:hexafluoropropylene in the initial tank is 1:3 (weight ratio), called the initial monomer mixture; the supplementary tank The ratio of tetrafluoroethylene: hexafluoropropylene is 9:1 (weight ratio), which is called feeding monomer mixture. Addition amount: the initial monomer mixture is 3kg, and the addition amount of the feed monomer mixture is 0.6kg.

[0036] After checking the tightness of the reactor, 2 L of liquid TFE and HFP mixture was added into the 3 L reactor under vacuum as a solvent and 0.05% of the total mass of the monomer as a methanol additive. Then add the initial monomer mixture until the pressure is 0.01-0.07MPa, and take a sample to analyze the oxygen content. When the oxygen content is not more than 0.002% (volume ratio), the reactor is cooled t...

Embodiment 3

[0039] Reactor tightness detection is the same as Example 1.

[0040] The ingredients of the mixing tank: the mixing tank is divided into an initial tank and an additional tank. The ratio of tetrafluoroethylene:hexafluoropropylene in the initial tank is 1:4 (weight ratio), which is called the initial monomer mixture; the additional tank The ratio of tetrafluoroethylene: hexafluoropropylene is 6:1 (weight ratio), which is called feeding monomer mixture. Dosage: initial monomer mixture 2kg, feed monomer mixture dosing 0.2kg.

[0041] After checking the tightness of the reactor, add 2L of a mixture of 1.2.2-trifluoro-1.1.2-trichloroethane and pure water into the 3L reactor under vacuum as a solvent and 0.2% of the total mass of the monomer as methanol agent. Then add the initial monomer mixture until the pressure is 0.01-0.07MPa, and take a sample to analyze the oxygen content. When the oxygen content is not more than 0.002% (volume ratio), the reactor is cooled to a certain temp...

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PUM

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Abstract

The invention relates to a polymerization process for increasing the end-group stability of perfluorinated ethylene-propylene copolymer resin. The method comprises the step of adding fluorine-containing diacyl peroxide as an initiator into organic solvent at a temperature between 10 and 100 DEG C, at a stirring speed between 60 and 1,000 r / min, under the reaction pressure between 0.7 and 4.0 MPa,so as to increase the end-group stability of perfluorinated ethylene-propylene copolymer resin. The process has the advantages that a synthetic polymer is stable in end group and good in mechanical properties, and can be used on high-end precision instrument equipment; as a monomer which can be recycled is adopted as the solvent, the process reduces cost; and the process has low polymerization pressure and low temperature, reduces energy consumption, reduces aftertreatment working stage, greatly reduces production cost, and improves material quality.

Description

technical field [0001] The invention belongs to the technical field of fluorine chemical industry and relates to a synthesis process of polyperfluoroethylene propylene resin, in particular to a polymerization process for increasing the stability of the terminal group of polyperfluoroethylene propylene resin. Background technique [0002] Polyfluoroethylene propylene copolymer (FEP), also known as fluoroplastic-46 (F46), is a copolymer of tetrafluoroethylene and hexafluoropropylene, which is a transparent particle (suspension polymer) or water dispersion (emulsion polymer) . The mechanical properties, chemical stability, electrical insulation, lubricity, non-stickiness, aging resistance, and non-combustibility of the resin are basically the same as those of polytetrafluoroethylene. Its outstanding advantage is that it has thermoplasticity and can be processed by commonly used thermoplastics. methods, such as extrusion, injection molding, transfer molding and other molding. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F214/26C08F2/06C08F4/34
Inventor 李秀芬武海朋王汉利曹守香
Owner SHANDONG HUAXIA SHENZHOU NEW MATERIAL
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