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Synthesis method of tetrapropyl fluoro rubber, and tetrapropyl fluoro rubber prepared by synthesis method

A technology of tetrapropylene fluororubber and a synthesis method, which is applied in the field of polymer material synthesis, can solve the problems of high compression set resistance value, unsuitable extrusion molding process, and high safety investment, achieves fast vulcanization speed and saves raw material costs , the effect of improving application performance

Active Publication Date: 2020-02-07
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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  • Synthesis method of tetrapropyl fluoro rubber, and tetrapropyl fluoro rubber prepared by synthesis method
  • Synthesis method of tetrapropyl fluoro rubber, and tetrapropyl fluoro rubber prepared by synthesis method
  • Synthesis method of tetrapropyl fluoro rubber, and tetrapropyl fluoro rubber prepared by synthesis method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0035] In a 5L stainless steel reaction kettle with a stirrer, add 3L of deionized water, 2g of dipotassium hydrogen phosphate, and 3g of emulsifier perfluoropolyether ammonium carboxylate. After repeated nitrogen pressurization and evacuation and degassing, add The molar ratio of tetrafluoroethylene and propylene is 70:30 mixed monomer, the pressure rises to 0.5MPa, start the reactor stirrer, then raise the temperature to 70°C, continue to add the mixed monomer and raise the pressure to 2.0MPa, and add it 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 I(CF 2 CF 2 ) 2 1 Polymerization starts, when reactor pressure drops every 0.01MPa, replenishes TFE / P mixed monomer in reactor, maintains ...

Embodiment 2

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

[0044] 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=70:30, 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=70:30 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, the I(CF of chain transfer agent 5g 2 CF 2 ) 21, start polymerization reaction, when reactor pressure drops every 0.01MPa, replenish TFE / P mixed monomer in...

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 invention relates to a synthesis method of tetrapropyl fluoro rubber. The main improvement point of the method is that: during the preparation process of the tetrapropyl fluoro rubber through an emulsion polymerization method by using tetrafluoroethylene and a propylene monomer as raw materials, a vulcanization point monomer, namely an alkene containing bromine or iodine is added, and I(CF<2>)<n>I is selected as a chain transfer agent, wherein n is an integer of 2-6. The tetrapropyl fluoro rubber obtained by the method has the characteristics of low Mooney viscosity, high tensile strength,and low permanent compression deformation, and has the characteristics of excellent water vapor resistance and alkali resistance. The method uses water as a medium for carrying out the reaction, thetetrapropyl fluoro rubber with the excellent performance can be obtained only with the addition of the vulcanization point monomer through selection of the chain transfer agent and an initiator, a wide variety of other additives are not needed to add, the raw material cost is saved, and the operation is simple.

Description

technical field [0001] The invention relates to the technical field of synthesis of polymer substances, in particular to a synthesis method of tetrapropylene fluorine rubber. Background technique [0002] Tetrapropylene fluorine rubber 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 fluorine rubber does not have. Widely used in heat-resistant wires, water vapor-resistant, alkali-resistant products, mainly used as "O" rings, seals, diaphragms, gaskets, films, etc. [0003] The prior art uses tetrafluoroethylene-propylene as the main comonomer, adopts a redox system, uses persulfate as the initiator, bisulfite and iron salt as the reducing agent, and adopts emulsion polymerization under high pressure reaction conditions. become. The resulting product has high molecular weight, high Mooney viscosity, slow polymerization speed, and dark emulsion ...

Claims

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Application Information

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Patent Type & Authority Applications(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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