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Perfluoroelastomer compsns.

A perfluoroelastomer and elasticity technology, applied in the field of perfluoroelastomer compositions, can solve the problems of difficult processing of perfluoroelastomers

Inactive Publication Date: 2001-05-09
3M INNOVATIVE PROPERTIES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, perfluoroelastomers are known to be very difficult to process due to mixing, flow characteristics and mold release

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] Several fluoropolymers were prepared in a manner similar to Example 1 of U.S. Patent No. 5,285,002, except that the monomers and other components used were expressed in grams by weight as follows. The monomers used are tetrafluoroethylene (TFE), perfluoromethyl vinyl ether (PMVE) and bromotrifluoroethylene (BTFE). Will (NH 4 ) 2 S 2 o 8 Recorded as APS. According to U.S. Patent 5,285, the method described in 002 prepares fluoride sulfinate (C 4 f 9 SO 2 Na).

[0070] Comparative Polymer A Polymer A

[0071] Deionized (DI) water 2,777 2,774

[0072] C 7 f 15 COONH 4 : 15.9 15.9

[0073] K 2 HPO 4 : 10 10

[0074] C 4 f 9 SO 2 Na: ---- 4

[0075] Pre-added monomer:

[0076] TFE: 142 140

[0077] PMVE: 342 331

[0078] BTFE: 3.9 3

[0079] Injected APS: 2 3

[0080] monomer fed during the reaction time

[0081] TFE: 662 664

[0082] PMVE: 496 497

[0083] BTFE: 9.7 9.9

[0084] Polymerization was 651 minutes at 60°C for Comparativ...

Embodiment 2

[0107] These samples were prepared to demonstrate the reactivity of the polymers when compounded with base or acid acceptors.

[0108] In addition to not using BTFE, but using 4 grams of APS and 5.4 grams of C 4 f 9 SO 2 Polymer B was prepared in a similar manner to Polymer A except that the polymerization was carried out at a pressure of 11.6 bar.

[0109] Comparative Polymer B was prepared in a similar manner to Polymer B except that no sulfinate was used, only 1 gram of APS was used and the polymerization was carried out at a pressure of 11.0 bar.

[0110] Polymer B has a Mooney viscosity (ML 1+10 at 121°C) of 38 compared to 73 for Comparative Polymer B.

[0111] Comparing polymer B with 15 phr of MT N990 carbon black and 6 phr of Ca(OH) 2 kneading. During mixing, the components become exothermic when mixed and form a brittle compound. When the comparative compound B was tested by MDR at 177°C, the torque of the brittle rubber increased from the initial 3.4dNm to 17dN...

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PUM

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Abstract

A perfluoroelastomer compound having improved processability comprising a perfluoroolefin, a perfluorovinyl ether and a halogen-containing cure site, where the polymer contains substantially no ionizable moieties; and processes for making such copolymers; and articles made therefrom.

Description

field of invention [0001] The present invention relates to peroxide-curable perfluoroelastomer compositions having good processability and good physical properties when vulcanized. background of the invention [0002] Perfluoroelastomers (elastic perfluoropolymers) are polymeric materials with outstanding high temperature durability and chemical resistance. Therefore, this composition is particularly useful as a seal and gasket in systems where high temperatures and / or aggressive chemicals are encountered. They are used in industries such as chemical processing, semiconductors, aerospace, petroleum, etc. [0003] Much of the outstanding properties of perfluoropolymers can be attributed to the stability and inertness of the copolymerized perfluoromonomer units that make up most of the polymer backbone, such as tetrafluoroethylene and perfluoro(alkyl vinyl) ethers. In order to fully achieve the elasticity, the perfluoropolymer is generally crosslinked, eg by vulcanization. ...

Claims

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Application Information

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IPC IPC(8): C08F214/26C08K5/14C08L27/12
CPCC08K5/14C08F214/262C08L27/12
Inventor W·M·格罗托尔特
Owner 3M INNOVATIVE PROPERTIES CO
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