Tetrafluoroethylene-propylene fluorine-containing elastic body and preparing method thereof

A tetrafluoroethylene and elastomer technology, applied in the field of new tetrafluoroethylene-propylene fluoroelastomer and its preparation, can solve the problems of difficult wastewater treatment, poor storage stability of emulsion, dark color of emulsion and copolymer, etc.

Active Publication Date: 2007-09-12
SHANGHAI 3F NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method overcomes the shortcomings of the method disclosed in U.S. Patent No. 4,277,586 that the polymerization rate is slow, the color of the emulsion and the copolymer is dark, the waste water is difficult to handle, the storage stability of the emulsion is poor, and th...

Method used

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preparation example Construction

[0019] The invention provides a method for preparing the tetrafluoroethylene-propylene fluoroelastomer. The method of the invention firstly provides a dispersion of tetrafluoroethylene, propylene and one or more comonomers in water.

[0020] Other comonomers used in the copolymerization with tetrafluoroethylene, propylene to form tetrafluoroethylene-propylene copolymers depend on the use of the final fluoroelastomer, and the other comonomers can be those known in the art for making fluoroelastomers Any comonomer of the body.

[0021] For example, according to specific applications, the other comonomers that can be copolymerized with tetrafluoroethylene and propylene to form tetrafluoroethylene-propylene copolymers are selected from vinyl compounds that can carry out radical copolymerization reactions with tetrafluoroethylene and propylene ( For example, ethylene, acrylic acid, methacrylic acid, acrylate, methacrylate, styrene, etc.) or the vinyl compound with at least one fluo...

Embodiment 1

[0077]In a 25-liter vertical reactor, add 16,000 grams of deionized water, 31.5 grams of sodium perfluorooctanoate and its homologous mixture, 250 grams of dipotassium hydrogen phosphate, 4.15 grams of ferric sulfate, and 9.25 grams of disodium edetate. Close the reactor, vacuumize and replace with nitrogen until the oxygen content in the reactor is less than or equal to 10ppm. Then start to stir at a rate of 300rpm, raise the internal temperature of the reactor to 30°C, supplement the comonomer mixture until the absolute pressure in the reactor reaches 3.6MPa, and the molar ratio of the comonomer mixture is that tetrafluoroethylene accounts for 75%. , Propylene accounted for 25%. Add 9 grams of potassium persulfate, 8.3 grams of CH 2 (OH)SO 2 K, 30.68 grams of potassium hydroxide, start the polymerization reaction. The absolute pressure in the reactor is maintained at 3.6 MPa by adding additional comonomers, the added comonomers having a molar ratio of tetrafluoroethylene ...

Embodiment 2

[0080] In a 25-liter vertical reactor, add 16,000 grams of deionized water, 31.5 grams of sodium perfluorooctanoate and its homologous mixture, 250 grams of dipotassium hydrogen phosphate, 4.15 grams of ferric sulfate, and 9.25 grams of disodium edetate. Close the reactor, vacuumize and replace with nitrogen until the oxygen content in the reactor is less than or equal to 10ppm. Then start to stir at a rate of 300rpm, raise the internal temperature of the reactor to 25°C, supplement the comonomer mixture until the absolute pressure in the reactor reaches 3.7MPa, and the molar ratio of the comonomer mixture is that tetrafluoroethylene accounts for 75%. , Propylene accounted for 25%. Add 9 grams of potassium persulfate, 8.3 grams of CH 2 (OH)SO 2 K, 30.68 grams of potassium hydroxide, start the polymerization reaction. The absolute pressure in the reactor is maintained at 3.7 MPa by adding additional comonomers, the added comonomers having a molar ratio of tetrafluoroethylene...

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Abstract

An tetrafluoroethylene-propylene fluorine-containing elastomer and its preparation method includes: (1) providing an aqueous dispersions of comonomer, which includes: (a) tetrafluoroethylene, propylene and one or more kind of other comonomers, (b) oxidation-reduction system, which includes: water-soluble inorganic peroxide initiator, water-soluble iron salt reductant, coordination agent, water-soluble inorganic aid reducer, (c) water-soluble metal hydroxide pH modifier, and (d) emulsifier. Its characteristic is (2) under the polymerization temperature of 10~50deg.C and polymerization pressure of 3.1~8MPa, the monomers take polymerization.

Description

technical field [0001] The invention relates to a novel tetrafluoroethylene-propylene fluoroelastomer and a preparation method thereof. Background technique [0002] Tetrafluoroethylene-propylene (TFE-P) fluorine-containing elastomer is a synthetic rubber with excellent performance. Elastomer and vinylidene fluoride-tetrafluoroethylene-hexafluoropropylene terpolymer fluoroelastomer) have excellent properties such as medium resistance and high temperature resistance, and also have high electrical insulation, water vapor resistance, alkali resistance, etc. Unique properties that vinylidene fluoride-based fluoroelastomers do not have. Tetrafluoroethylene-propylene fluoroelastomers are mainly used in heat-resistant wires, water vapor-resistant, alkali-resistant rubber products, etc. It can be made into various O-rings, seals, and diaphragms by extrusion, molding, and other molding methods. , Gaskets, films, valves, hoses, rubber rollers, cables and other rubber products. [0...

Claims

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Application Information

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IPC IPC(8): C08F214/26C08F4/40C08F2/24C08F210/06
Inventor 张冰冰吕克勤徐刚
Owner SHANGHAI 3F NEW MATERIAL TECH CO LTD
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