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: 2012-05-09
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 free radical emulsion polymerization of the present invention is carried out in a 50L autoclave to prepare fluororubber. Add 30L of non-ionized water, 500g of 5wt% ammonium perfluorooctanoate aqueous solution, 40g of pH regulator disodium hydrogen phosphate into the reactor, and replace the air in the vapor space of the reactor with nitrogen first, and then replace it with mixed monomers to make the oxygen content less than 20ppm, the reactor was raised to 120°C. A diaphragm compressor was used to add the above monomer mixture to the reactor to increase the pressure to 3.5Mpa. After reaching 3.5Mpa, the reactor pressure controller is set to automatically operate at 3.5Mpa.

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

Embodiment 2

[0047] The batch free radical emulsion polymerization of the present invention is carried out in a 4000L autoclave to prepare fluororubber. Add 2200L of non-ionized water, 40Kg of 5wt% perfluorooctanoic acid amine aqueous solution, 2.8Kg of pH adjuster, disodium hydrogen phosphate into the reactor, and replace the air in the vapor space of the reactor with nitrogen first, and then replace it with mixed monomers to increase the oxygen content If it is less than 20 ppm, raise the reactor to 100°C. A diaphragm compressor was used to add the above monomer mixture to the reactor to increase 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 reaches 3.5MPa, the stirring is started, the mixed monomers in the reactor are fully mixed, and then 7Kg of initiator solution (5wt%) is added to start the reaction. During the reaction process, the reactor pressure was maintained at 3...

Embodiment 3

[0054] The polymerization temperature of Example 1 was changed to 90°C, and the 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 for fluorine rubber. Background technique [0002] Fluororubber (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, propylene, etc., trial-produced by the American DuPont company in 1948, but its performance was not more outstanding than that of neoprene and butadiene rubber. It is expensive and has no real industrial value. In the late 1950s, American Thiokol Company developed a kind of good low temperature resistance, strong oxidant resistance (N 2 O 4 ) Binary nitroso fluorine rubber, fluorine rubber began to enter practical industrial applications. Since then, with technological progress, various new types of fluorine rubber have been continuously developed. [000...

Claims

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Application Information

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Patent Type & Authority Applications(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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