Method for preparing high-strength ternary fluororubber

A ternary fluororubber, high-strength technology, applied in the field of fluoroelastomers, can solve problems such as poor processing performance and decreased vulcanization performance, and achieve good vulcanization performance and good liquid resistance

Active Publication Date: 2008-05-28
CHENGUANG RES INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, after the strength of general ternary fluorine rubber reaches 20Mpa, the vulcanization performance decreases obviously, and the processing performance is poor.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The emulsion polymerization of the present invention was carried out in a 50 L reactor to prepare fluoroelastomers. Add 30 L of deionized water containing 10 g of fluorocarbon solubilizing emulsifier (component is perfluorocarbon) into the reactor. The reactor should be evacuated, and when the oxygen content is ≤30ppm, add 30g of borax, 10ml of diethyl malonate, CCL 4 5ml. The contents in the reactor were heated to 70°C, and were mixed with a monomer mixture containing 44.02% vinylidene fluoride, 15.78% tetrafluoroethylene (TFE), and 40.2% perfluoropropylene (HFP) (molar ratio). The pressure rose to 2.76MPa. Stirring was started at a rate of 88r / min, and the reactor pressure controller was set to an automatic operation state at a pressure of 2.76MPa.

[0038] When the reactor temperature was kept at 70°C, the pressure of the barostat was increased to 3.0 MPa by adding mixed monomers, the mixture contained 58.4 mol% of VDF, 16.2 mol% of TFE, and 25.4 mol% of HFP, onc...

Embodiment 5

[0047] The emulsion polymerization of the present invention was carried out in a 50 L reactor to prepare fluoroelastomers. Add 30L deionized water containing 10g fluorocarbon solubilizing emulsifier in the reactor. The reactor should be evacuated, and when the oxygen content is less than or equal to 30ppm, add 30g of borax. The contents of the reactor were heated to 70 ° C, with 44.02% vinylidene fluoride (VF 2 ), 15.78% tetrafluoroethylene (TFE), the monomer mixture of 40.2% perfluoropropylene (HFP) (molar ratio) raises its pressure to 2.36MPa. Stirring was started at a rate of 88r / min, and the reactor pressure controller was set to an automatic operation state at a pressure of 2.36MPa.

[0048] When the reactor temperature was maintained at 70°C, the pressure of the barostat was increased to 2.6 MPa by adding mixed monomers, the mixture contained 58.4 mol% of VDF, 16.2 mol% of TFE, and 25.4 mol% of HFP, once When the constant pressure reaches 3.0MPa, start to automaticall...

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Abstract

The invention provides a preparation method of high-strength ternary fluorine elastomer, which uses emulsion polymerization, uses 50-70mol% 1, 1-difluoroethylene, 10-30mol% fluoropropene and 10-20mol% perfluoroethylene as coplymeric units, uses 0.001-3 weight account of emulsifier in each 100 weight account of water medium, uses 0.1-7wt% persulfate water solution as initiator, to obtain high-strength elastomer via free radical emulsion polymerization, while the strength of the product can reach at least 20MPa and extensibility can reach at least 200%, with better sulfuration property, better liquid resistance, ability for producing die product, and better abrasion resistance.

Description

technical field [0001] The present invention relates to a preparation method of high-strength ternary fluorine rubber, in particular to the preparation of copolymerized units comprising 1,1-difluoroethylene, tetrafluoroethylene and perfluoropropylene in a specific molar ratio, the strength of which can reach more than 20 MPa , The elongation rate is above 200%, and it has good liquid resistance and good vulcanization performance. Background technique [0002] Viton is known for its excellent heat resistance, liquid resistance and oil resistance as well as good physical and mechanical properties, electrical insulation and radiation resistance. It can work long-term at 250°C and short-term at 300°C. [0003] Viton can be widely used in aviation and aerospace, automobiles and off-road vehicles, oil exploration and petrochemical industry, industrial pollution control, hydraulic and pneumatic devices, etc. Especially in recent years, with the expansion of the application of flu...

Claims

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Application Information

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IPC IPC(8): C08F214/22C08F2/22C08F2/38C08F4/30C08F214/28C08F214/26
Inventor 周晓斌张全张海波
Owner CHENGUANG RES INST OF CHEM IND
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