Synthetic method for fluororubber

A synthetic method and technology of fluororubber, applied in the field of fluororubber, can solve the problems of low Mooney value of fluororubber and inability to adapt to higher performance requirements, and achieve good vulcanization performance, good oil resistance and mild reaction conditions.

Active Publication Date: 2013-12-04
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

[0008] In order to overcome the technical defects that the Mooney value of the fluororubber synthesized in the prior art is low and cannot adapt to higher performance requirements, the purpose of the present invention is to provide a synthetic method of fluororubber

Method used

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  • Synthetic method for fluororubber
  • Synthetic method for fluororubber
  • Synthetic method for fluororubber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The batch radical emulsion polymerization of the present invention is carried out in a 50L autoclave to prepare fluororubber. In the reactor, add 30L deionized water and 500g 5wt% ammonium perfluorooctanoate aqueous solution, 40g pH regulator disodium hydrogen phosphate, the air in the vapor space in the reactor is first replaced with nitrogen, and then replaced with mixed monomers, so that the oxygen content is less than 20ppm, the reaction kettle was raised to 120°C. Add the above-mentioned monomer mixture into the reaction kettle with a diaphragm compressor to raise the pressure to 3.5Mpa. After reaching 3.5Mpa, the reactor pressure controller is set to automatically operate at 3.5Mpa.

[0041] When the pressure of the reactor reached 3.5 MPa, the stirring was started, the mixed monomers in the reactor were fully mixed, and then 100 g of initiator solution (5 wt %) was added to start the reaction. During the reaction process, the pressure of the reactor was kept at...

Embodiment 2

[0047] The batch radical emulsion polymerization of the present invention is carried out in a 4000L autoclave to prepare fluororubber. In the reactor, add 2200L deionized water and 40Kg 5wt% perfluorooctanoic acid ammonium aqueous solution, 2.8Kg pH regulator disodium hydrogen phosphate, the air in the vapor space in the reactor is first replaced with nitrogen, and then replaced with mixed monomers to make the oxygen content Less than 20ppm, the reaction kettle was raised to 100°C. Add the above-mentioned monomer mixture into the reaction kettle with a diaphragm compressor to raise the pressure to 3.5Mpa. After reaching 3.5Mpa, the reactor pressure controller is set to automatically operate at 3.5Mpa.

[0048] When the pressure of the reactor reached 3.5MPa, the stirring was started, the mixed monomers in the reactor were fully mixed, and then 7Kg of initiator solution (5wt%) was added to start the reaction. During the reaction process, the pressure of the reactor was kept a...

Embodiment 3

[0054] The temperature of the polymerization reaction in Example 1 was changed to 90° C., and other conditions remained unchanged.

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Abstract

The invention relates to a synthetic method for fluororubber. According to the invention, polymeric monomers comprise, by molar weight, 45 to 70% of vinylidene fluoride, 30 to 55% of hexafluoropropene and 0 to 20% of tetrafluoroethene, and are polymerized by using an intermittent emulsion polymerization method, and obtained polymerized emulsion is subjected to coacervation, rinsing, drying and plastication molding so as to obtain the fluororubber. The synthetic method provided in the invention is simple to operate, needs mild reaction conditions, effectively controls a Mooney point of the fluororubber through the measures of adjusting the structure of the monomers, changing reaction temperature, changing addition time of a chain transferring agent, etc., and prepares the fluororubber with a high Mooney point; the prepared fluororubber with a high Mooney point has good curability and excellent oil resistance and can be applied in a plurality of industries, especially in the industry of automobiles.

Description

technical field [0001] The invention relates to the field of fluorine-containing rubber, in particular to an emulsion polymerization method of fluorine rubber. Background technique [0002] Fluorine rubber (fluororubber) refers to a synthetic polymer elastomer containing fluorine atoms on the carbon atoms of the main chain or side chain. The earliest fluorine rubber was poly-2-fluoro-1.3-butadiene and its copolymers with styrene and propylene, which were trial-produced by DuPont Company of the United States in 1948, but its performance was not better than that of chloroprene rubber and butyl rubber. Expensive, no real industrial value. In the late 1950s, Thiokol Corporation of the United States developed a kind of low-temperature performance and strong oxidizing resistance (N 2 o 4 ) of binary nitrosofluororubber, and fluororubber began to enter practical industrial applications. Since then, with the advancement of technology, various new fluororubbers have been continuo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F214/22C08F214/28C08F214/26C08F2/24C08F2/38
Inventor 兰军张建新李斌赵少春高家勇王先荣
Owner ZHONGHAO CHENGUANG RES INST OF CHEMICALINDUSTRY CO LTD
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