A kind of synthetic method of tetrapropylene fluorine rubber and its tetrapropylene fluorine rubber

A tetrapropylene fluorine rubber and synthetic method technology, applied in the field of polymer material synthesis, can solve the problems of unsuitable extrusion molding process, high compression set resistance, high safety investment, etc., to save raw material costs and fast vulcanization speed , Improve the effect of application performance

Active Publication Date: 2021-06-22
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

Its high-pressure polymerization requires high investment in safety; the obtained product has a high Mooney viscosity, which is not suitable for extrusion molding, and the obtained product has low strength and high compression set resistance

Method used

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  • A kind of synthetic method of tetrapropylene fluorine rubber and its tetrapropylene fluorine rubber
  • A kind of synthetic method of tetrapropylene fluorine rubber and its tetrapropylene fluorine rubber
  • A kind of synthetic method of tetrapropylene fluorine rubber and its tetrapropylene fluorine rubber

Examples

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Effect test

Embodiment 1

[0034] The present embodiment relates to a preparation method of tetrapropylene fluorine rubber, comprising the following steps:

[0035] In a 5L stainless steel reactor with a stirrer, add 3L deionized water, 2g dipotassium hydrogen phosphate, 3g emulsifier perfluoropolyether ammonium carboxylate, repeat nitrogen pressurization, evacuation and degassing, then add to the reactor The mixed monomer whose molar ratio of tetrafluoroethylene and propylene is 70:30, the pressure rises to 0.5MPa, starts the reactor agitator, then heats up to 70°C, continues to add the mixed monomer and increases the pressure to 2.0MPa, and adds through the metering pump. Vulcanization point monomer perfluorobromoethyl vinyl ether 10g, redox initiator 2.5g ammonium persulfate and 2.5g potassium persulfate mixture, 2.5g sodium metabisulfite, initiator 5g of I(CF 2 CF 2 ) 2 1 Polymerization started, and when the pressure of the reactor decreased by 0.01MPa, TFE / P mixed monomer was supplemented in the ...

Embodiment 2

[0043] The present embodiment relates to a preparation method of tetrapropylene fluorine rubber, comprising the following steps:

[0044] In a 5L stainless steel reactor with a stirrer, add 3L deionized water, 2g dipotassium hydrogen phosphate, 3g emulsifier, repeat nitrogen pressurization, evacuation and degassing, then add a mixture of tetrafluoroethylene and propylene to the reactor Monomer, the molar ratio is TFE / P=70:30, the pressure is raised to 0.5MPa, the reactor stirrer is started, then the temperature is raised to 70°C, and the mixed monomer of TFE / P=70:30 is added and the pressure is raised to 3.0MPa , add vulcanization point monomer 10g perfluorobromoethyl vinyl ether by metering pump, redox initiator 2.5g ammonium persulfate and 2.5g potassium persulfate mix, 2.5g sodium metabisulfite, chain transfer agent 5g I(CF 2 CF 2 ) 21, start polymerization reaction, when reactor pressure drops every 0.01MPa, replenish TFE / P mixed monomer in reactor, maintain reactor inte...

Embodiment 3

[0047] The present embodiment relates to a kind of preparation method of tetrapropylene fluorine rubber, comprises the steps:

[0048] In a 5L stainless steel reaction kettle with a stirrer, add 3L of deionized water, 2g of dipotassium hydrogen phosphate, and 3g of emulsifier. After repeated nitrogen pressurization and evacuation and degassing, a mixture of tetrafluoroethylene and propylene is added to the reaction kettle. Monomer, the molar ratio is TFE / P=80:20, the pressure rises to 0.5MPa, start the reactor agitator, then raise the temperature to 70°C, continue to add the mixed monomer of TFE / P=80:20 to raise the pressure to 3.0MPa , add vulcanization point monomer 10g perfluorobromoethyl vinyl ether by metering pump, redox initiator 2.5g ammonium persulfate and 2.5g potassium persulfate mix, 2.5g sodium metabisulfite, chain transfer agent 5g of I( CF 2 CF 2 ) 2 1 Polymerization starts, when reactor pressure drops every 0.01MPa, replenishes TFE / P mixed monomer in reactor...

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Abstract

The present invention relates to a synthesis method of tetrapropylene fluorine rubber. The main improvement point is that, in the process of preparing tetrapropylene fluorine rubber by emulsion polymerization method, the bromine-containing monomer of vulcanization point is added by using tetrafluoroethylene and propylene monomer as raw materials. or iodine alkenes, select I(CF 2 ) n I is a chain transfer agent, wherein n is an integer of 2-6. The tetrapropylene fluorine rubber obtained by the method of the invention has the characteristics of low Mooney viscosity, high tensile strength and low permanent compression deformation, and has excellent water vapor resistance and alkali resistance characteristics. The method of the present invention adopts water as the medium to carry out the reaction, and through the selection of the chain transfer agent and the initiator, the tetrapropylene fluorine rubber with excellent performance can be obtained only by adding the vulcanization point monomer, without adding other various Additives, saving raw material cost and simple operation.

Description

technical field [0001] The invention relates to the technical field of polymer substance synthesis, in particular to a method for synthesizing tetrapropylene fluorine rubber. Background technique [0002] Tetrapropylene fluororubber is a kind of fluoroelastomer with excellent water vapor resistance, alkali resistance and high electrical insulation properties. This is a unique property that vinylidene fluoride fluororubber does not have. It is widely used in the fields of heat-resistant wires, water vapor-resistant and alkali-resistant products, mainly used as "O" rings, seals, diaphragms, gaskets, films, etc. [0003] The prior art adopts tetrafluoroethylene-propylene as the main comonomer, adopts a redox system, uses persulfate as an initiator, bisulfite and iron salt as reducing agents, and adopts emulsion polymerization under high pressure reaction conditions. to make. The obtained product has high molecular weight, high Mooney viscosity, slow polymerization speed, and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F214/26C08F2/30C08F2/38C08F210/06C08F216/14
CPCC08F2/30C08F2/38C08F210/06C08F214/262C08F216/1408C08F214/26C08F216/14
Inventor 曾波汪仲权王先荣陈炯
Owner ZHONGHAO CHENGUANG RES INST OF CHEMICALINDUSTRY CO LTD
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