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Method for preparing fluorine-containing rubber for automobile rubber pipe

A technology of fluorine-containing rubber and automotive rubber hose, which is applied in the direction of pipes, rigid pipes, mechanical equipment, etc., can solve the problems of poor oil resistance and solvent resistance, improve oil resistance and acid and alkali resistance, and improve vulcanization speed and fluidity Effect

Active Publication Date: 2012-06-27
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

The fluorine content of this kind of fluorine rubber is generally about 67%, and its oil resistance and solvent resistance are poor.

Method used

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  • Method for preparing fluorine-containing rubber for automobile rubber pipe

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 50L vertical reactor, add 30L deionized water, evacuate until the oxygen content is less than 50ppm, add 20g of perfluoroisopropyl ether peroxide, add the initial monomer reactor pressure to 2.0MPa, the tetrafluoroethylene in the initial mixed monomer Ethylene: vinylidene fluoride: the molar ratio of perfluoropropylene is 5: 50: 45, and be warming up to 85 ℃ simultaneously, add the ammonium persulfate solution, 30g borax, 15g diethyl malonate that 6g mass fraction is 0.1%, Start the reaction, during which additional mixed monomers are added to maintain the pressure of the reactor at 2.0Mpa. The molar ratio of tetrafluoroethylene: vinylidene fluoride: perfluoropropylene in the added mixed monomers is 10:68:22. Turn on the continuous feed pump at this time, continuously feed tetrafluorodibromoethane at a rate of 2.5 g / min, stop the feed after about 60 min, and stop the reaction when the feed reaches 12 kg. Recover the monomer to the monomer storage tank, evacuate, release...

Embodiment 2

[0029] 50L vertical reaction kettle, add 30L deionized water, evacuate until the oxygen content is less than 50ppm, add 15g perfluoroisopropyl ether peroxide, add the initial monomer reaction kettle pressure is 5.0Mpa, the tetrafluoroethylene in the initial mixed monomer Ethylene: vinylidene fluoride: the molar ratio of perfluoropropylene is 1: 55: 45, and simultaneously heat up to 100 DEG C, add 3g mass fraction and be 1% potassium persulfate solution, 60g borax, 30g ethyl acetate, start reaction, During this period, additional mixed monomers were added to maintain the pressure of the reactor at 5.0Mpa, and the molar ratio of tetrafluoroethylene: vinylidene fluoride: perfluoropropylene in the additional mixed monomers was 15:65:30, and the continuous Add the pump to continuously add perfluorobutyl diiodide at a rate of 2.5g / min, stop the addition after about 12 minutes, and stop the reaction when the feed reaches 12kg. Recover the monomer to the monomer storage tank, evacuate...

Embodiment 3

[0031] 50L vertical reaction kettle, add 30L deionized water, evacuate until the oxygen content is less than 50ppm, add 30g perfluoroisopropyl ether peroxide, add the initial monomer reaction kettle pressure is 4.5Mpa, the tetrafluoroethylene in the initial mixed monomer The molar ratio of ethylene: vinylidene fluoride: perfluoropropylene is 3: 52: 50, and at the same time, the temperature is raised to 60 ° C, and 15 g of ammonium persulfate solution, 45 g of borax, and 6 g of carbon tetrachloride are added to start the reaction. , during which additional mixed monomers are added to maintain the pressure of the reactor at 4.5Mpa, and the molar ratio of tetrafluoroethylene: vinylidene fluoride: perfluoropropylene in the additional mixed monomers is 1:70:20, and it will be opened when the feed reaches 8.5kg Continuously add the pump, add diiodomethane continuously at a rate of 2.5g / min, stop adding after about 24min, and stop the reaction when the feed reaches 12kg. Recover the ...

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Abstract

The invention relates to a method for preparing a fluorine-containing rubber for an automobile rubber pipe, which comprises the following steps of: (1) adding deionized water into a reaction kettle, and reserving 30-50% space; (2) evacuating the reaction kettle and removing oxygen; (3) adding emulsifier into the reaction kettle, and then adding initial mixing monomers of tetrafluoroethylene, vinylidene fluoride and perfluoropropylene till the pressure is 0.7-5.0MPa, and adding triggers, chain transfer agents and pH value regulators, and performing polymerization reaction; (4) during a reaction process, replenishing the initial mixing monomers of tetrafluoroethylene, vinylidene fluoride and perfluoropropylene, and keeping the constant pressure of the reaction kettle, thereby obtaining a perfluoroethylene-propylene copolymer; and (5) vulcanizing the copolymer, thereby obtaining the fluorine-containing rubber for the automobile rubber pipe. The rubber for the automobile rubber pipe prepared according to the method provided by the invention has the advantages of excellent molecular weight distribution, excellent solvent resistance and wider industrial application prospect.

Description

technical field [0001] The invention relates to the field of chemistry and chemical engineering, in particular to a preparation method of fluorine-containing rubber for automobile hoses. Background technique [0002] Fluorine rubber is currently the first choice for the automotive industry. Especially in recent years, with the emergence of new environmentally friendly energy sources and fuels, more stringent requirements have been put forward for fluorine rubber, and the requirements for certain aspects of products for different purposes have become more detailed. [0003] Through the research on the vulcanization mechanism of fluororubber, we know that the lower the molecular weight of ordinary fluororubber, the worse the vulcanization performance, but the better the scorch resistance, the higher the molecular weight, the better the vulcanization performance, but the worse the scorch resistance. We are extruding It is required that this type of fluororubber must have good v...

Claims

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Application Information

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IPC IPC(8): C08F214/22C08F214/18C08F214/26C08F2/24C08F2/38C08L27/12C08L27/16F16L9/12
Inventor 张海波张建新刘斌李斌
Owner ZHONGHAO CHENGUANG RES INST OF CHEMICALINDUSTRY CO LTD
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