Fluororubber and synthesis method thereof

A synthesis method and technology of fluororubber, applied in the field of materials, can solve the problems of easy wall formation of reactors, lower polymerization temperature, and high production costs, and achieve the effects of short vulcanization time, fast vulcanization speed, and low hardness

Active Publication Date: 2014-06-04
CHENGUANG RES INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the polymerization process, it is easy to form a wall in the reactor
The use of ultraviolet light to trigger organic peroxides to carry out microemulsion polymerization greatly reduces the polymerization temperature, thereby improving the stability of the emulsion and improving the phenomenon of polymer wall sticking, but the process is complicated and the production cost is high.

Method used

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  • Fluororubber and synthesis method thereof
  • Fluororubber and synthesis method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0054] The batch radical emulsion polymerization of the present invention is carried out in a 50L high-pressure reactor to prepare fluororubber. Add 30L deionized water and 500ml 5wt% perfluorooctanoic acid ammonium aqueous solution in the reactor, 40g pH regulator ammonium carbonate, the air in the vapor space in the reactor is first replaced with nitrogen, and then the initial mixed monomer (vinylidene fluoride: hexafluoropropylene =35:65(mol)) to make the oxygen content less than 20ppm. The stirring was started, and the temperature inside the reactor was raised to 60°C. Add chain transfer agent methane gas (15g), and use a diaphragm compressor to add the above-mentioned initial mixture monomer into the reactor to raise the pressure to 3.5Mpa.

[0055] When the pressure of the reactor reached 3.5 MPa, the mixed monomers in the reactor were fully mixed, and then 10 g of initiator azobisisobutylamidine hydrochloride was added to start the reaction. During the reaction proces...

Embodiment 2

[0059] The batch radical emulsion polymerization of the present invention is carried out in a 50L high-pressure reactor to prepare fluororubber. Add 30L deionized water and 500ml 5wt% perfluorooctanoic acid ammonium aqueous solution in the reactor, 40g pH regulator ammonium carbonate, the air in the vapor space in the reactor is first replaced with nitrogen, and then the initial mixed monomer (vinylidene fluoride: hexafluoropropylene : Tetrafluoroethylene=33:55:12 (mol)) replacement, so that the oxygen content is less than 20ppm. The stirring was started, and the temperature inside the reactor was raised to 60°C. Add chain transfer agent methane gas (15g), and use a diaphragm compressor to add the above-mentioned initial mixture monomer into the reactor to raise the pressure to 3.5Mpa.

[0060] When the pressure of the reactor reached 3.5 MPa, the mixed monomers in the reactor were fully mixed, and then 8 g of initiator azobisisobutylamidine hydrochloride was added to start t...

Embodiment 3

[0064] The batch radical emulsion polymerization of the present invention is carried out in a 50L high-pressure reactor to prepare fluororubber. Add 30L deionized water and 500ml 5wt% perfluorooctanoic acid ammonium aqueous solution in the reactor, 35g pH regulator ammonium bicarbonate, the air in the vapor space in the reactor is first replaced with nitrogen, and then the initial mixed monomer (vinylidene fluoride: hexafluoro Propylene=22:78(mol)) replacement, so that the oxygen content is less than 20ppm. The stirring was started, and the temperature inside the reactor was raised to 65°C. Add chain transfer agent methane gas (15g), and use a diaphragm compressor to add the above-mentioned initial mixture monomer into the reactor to raise the pressure to 3.5Mpa.

[0065] When the pressure of the reactor reached 3.5 MPa, the mixed monomers in the reactor were fully mixed, and then 10 g of initiator azobisisobutylamidine hydrochloride was added to start the reaction. During t...

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Abstract

The invention discloses fluororubber. The monomers of the fluororubber comprise the following components: 30-80mol% of vinylidene fluoride, 10-45mol% of hexafluoropropylene and 0-20mol% of tetrafluoroethylene. The synthesized fluororubber disclosed by the invention is fewer in ionic terminal groups, fast in curing speed, low in hardness, high in tensile strength, and low in pressure change, wherein the number of the ionic terminal groups is smaller than 8 per 106 carbon atoms; the hardness HA is smaller than 74; the tensile strength is greater than 14.5Mpa; and the permanent compression deformation is smaller than 17%.

Description

technical field [0001] The invention relates to the preparation of materials and belongs to the field of materials, in particular to a fluorine rubber and a synthesis method thereof. Background technique [0002] Fluoroelastomer was successfully developed in 1957 and was initially used in the aerospace industry as a high-performance elastic sealing material. Since then, the application field of fluoroelastomers has gradually expanded to many other industrial fields, especially the automobile industry, hydraulic transmission and chemical industry. The main performance characteristics of fluoroelastomers include high temperature resistance, medium resistance, low permeability, good high temperature compression set resistance, good weather resistance, good low voltage, low frequency electrical properties and flame retardancy. However, in practical applications, fluororubbers are often affected by factors such as chemical composition, chemical structure and physical form, which...

Claims

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Application Information

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IPC IPC(8): C08F214/22C08F214/28C08F214/26C08F2/38C08L27/16
Inventor 兰军钟子强张建新李斌曾波余金龙王先荣白鲸赵媛媛张廷健
Owner CHENGUANG RES INST OF CHEM IND
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