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Fluorine containing elastomer composition

A technology of elastomer and composition, applied in the field of preparation of fluorine-containing elastomer, can solve problems such as poor heat resistance, and achieve the effect of good heat resistance

Inactive Publication Date: 2005-11-23
NIPPON MEKTRON LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in general, fluoroelastomers containing iodine as a crosslinking site have the advantage of high vulcanization speed compared to fluoroelastomers containing bromine or bromine and iodine, but have the disadvantage of poor heat resistance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

reference example 1

[0034] (1) 162 g (1 mole) of liquid ICl was placed in a reactor at a temperature of 28-29° C., and 1,1-difluoroethylene gas was blown thereinto. The temperature immediately dropped to 22-24°C. Continue to blow in 1,1-difluoroethylene until no more 1,1-difluoroethylene is consumed, and keep the temperature at 22-24°C. After the reaction, the final black reaction mixture was washed with 100ml of water containing Na 2 SO 3 and Na 2 CO 3 Each 5g of aqueous solution was washed, and then washed with water, and washed with MgSO 4 Drying thus gave 209 g of 2,2-difluoro-2-chloroiodoethane with a purity of 98% or more (measured by gas chromatography) (yield: 92.5%).

[0035] (2) Add 33.9g (0.15mol) of 2,2-difluoro-2-chloroiodoethane obtained in (1) above to 28ml containing 0.7g (2.1mmol) tetrabutylammonium bromide (at 70°C 60% by weight aqueous potassium hydroxide solution dissolved therein), and the mixture was heated and stirred to reflux while distilling off fractions having a ...

reference example 2

[0063] 22.6g (0.1mol) of 2,2-difluoro-2-chloroiodoethane, 0.5g (1.9mmol) of 18-crown-6 and 30ml of 60% by weight potassium hydroxide aqueous solution obtained in reference example 1 (1) The mixture was distilled slowly at reflux and the aromas were collected in a trap cooled to -10°C. The capture fraction (a fairly pure desired product containing traces of raw material) was subjected to MgSO 4 Drying followed by redistillation gave 7.4 g of 2,2-difluoroiodoethylene having a boiling point of 40-42° C. (yield: 39%).

reference example 3

[0065] 50g (0.22 moles) obtained in reference example 1 (1) 2,2-difluoro-2-chloroiodoethane, potassium hydroxide aqueous solution containing 100g potassium hydroxide in 60ml water, 25ml dioxane and 0.75g ( 2.8 mmol) of 18-crown-6 was stirred at a temperature of 80-90°C and the volatiles were collected in a trap cooled to -10°C. The organic layer was separated from the trapping components, and the 4 Drying gave 43 g of a mixture of desired product, starting material and dioxane (composition ratio 44.6:46.5:8.9 as determined by gas-liquid chromatography). The mixture was redistilled to obtain 18.1 g of 2,2-difluoroiodoethylene having a boiling point of 40-42°C. The yield of the desired product as the remainder minus the starting material was 72%.

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Abstract

A fluorine-containing elastomer composition, including (1) a fluorine-containing elastomer is produced by polymerization reaction of a fluorinated olefin having 2 to 8 carbon atoms in the presence of a diiodide compound represented by the following general formula I-R-I where R is a divalent fluorohydrocarbon group, chlorofluorohydrocarbon group or hydrocarbon group, having 2 to 8 carbon atoms, respectively, and 2,2-difluoroiodoethylene. (2) organic peroxide and (3) multifunction unsaturated compound.

Description

[0001] This patent application is a divisional application of the Chinese patent application with the application number 97125235.1, the application date is November 29, 1997, and the invention title is "Preparation Method of Fluorine-Containing Elastomer". technical field [0002] The invention relates to a preparation method of a fluorine-containing elastomer, in particular to a preparation method of a peroxide vulcanizable fluorine-containing elastomer obtained by copolymerizing a novel cross-linkable monomer. Background technique [0003] Due to their outstanding chemical resistance and mechanical properties, especially their resistance to alkaline additives, fluoroelastomer peroxide-cured products have been widely used in the field of automotive parts in recent years. Due to peroxide vulcanization, fluoroelastomers containing iodine, bromine or both of them as their crosslinking sites have been used (JP-53-4115B, JP-1-57126A, JP-7-316234, etc.). [0004] However, genera...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F2/00C08F214/18C08F214/22
CPCC08F2438/01C08F214/22C08F214/184
Inventor 齐藤智川崎邦义达春美
Owner NIPPON MEKTRON LTD