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Curable base-resistant fluoroelastomers

一种弹性体、单体的技术，应用在多羟基可固化含氟弹性体组合物领域，能够解决工业过程不适合、过氧化物固化不理想、可固化组合物易焦烧等问题

Inactive Publication Date: 2007-04-18
EI DU PONT DE NEMOURS & CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The peroxide cure disclosed in U.S. Patent 4,910,260 is undesirable because the initially formed curable composition is highly scorch-prone and therefore unsuitable for many industrial processes

Method used

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  • Curable base-resistant fluoroelastomers
  • Curable base-resistant fluoroelastomers
  • Curable base-resistant fluoroelastomers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] The inventive polymer (Polymer 1) was prepared by semi-batch emulsion polymerization carried out at 60°C in a well stirred reaction vessel. 20 liters of deionized deoxygenated water, 150 grams of ammonium perfluorooctanoate and 70 grams of disodium hydrogen phosphate heptahydrate were added to a 33 liter horizontally stirred reactor. The reactor was heated to 60°C and then filled with 96 wt% tetrafluoroethylene (TFE), 2 wt% propylene (P) and 2 wt% CF 3 CF 2 CH=CH 2 The mixture of curing site monomers was pressurized to 1.93 MPa. A 250 mL aliquot of a 10% by weight aqueous ammonium persulfate initiator solution was then added. The reactor was fed with 70.0 wt% TFE, 20.0 wt% P and 10.0 wt% CF 3 CF 2 CH=CH 2 mixture to maintain a pressure of 1.93 MPa throughout the polymerization. The initiator solution was fed continuously at 5 ml / h until the end of the reaction period. After a total of 6000 grams of monomer mixture had been fed to the reactor, the monomer feed wa...

Embodiment 2

[0056] A curable composition of the invention (Sample 1) was produced by mixing the following ingredients: 100 parts by weight per hundred rubber (phr) Fluoroelastomer of the invention (Polymer 1 prepared above), 2 phr Bisphenol AF, 6 phr Maglite (R) D Magnesium Oxide (available from C.P. Hall), 2.3 phr Tetrabutylammonium Hydroxide and 30 phr MT Carbon Black on a conventional two roll rubber mill using standard mixing techniques used in the elastomer industry. A comparative curable composition (Comparative Sample A) was produced by the same procedure except using 3 CF 2 CH=CH 2 A prior art fluoroelastomer (Comparison Polymer A prepared above) was cured in monomeric units.

[0057] Curing properties were determined by MDR (24 minutes at 177° C.) according to the test method. Sample 1 cured as indicated by the increase in torque (M) during the test. However, control polymer B, which does not contain CF 3 CF 2 CH=CH 2 The copolymerized units of the cure site monomers do no...

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Abstract

Compositions of specialty fluoroelastomers containing copolymerized units of tetrafluoroethylene, propylene, optionally vinylidene fluoride, and a cure site monomer selected from the group consisting of i) perfluoroalkyl ethylenes and vii) perfluoroalkoxy ethylenes are readily curable with polyhydroxy curing systems. The resulting cured articles have a combination of excellent resistance to alkaline fluids, superior tensile properties and compression set resistance.

Description

technical field [0001] The present invention relates to polyhydroxyl curable fluoroelastomer compositions wherein the fluoroelastomer comprises copolymerized units of tetrafluoroethylene, propylene and a cure site monomer selected from the group consisting of i) perfluoroalkylethylenes and ii) perfluoroalkoxyethylene. Background technique [0002] Composed of tetrafluoroethylene (TFE), propylene (P) and optionally vinylidene fluoride (VF 2 ) made of special fluoroelastomers (ie TFE / P binary copolymer or VF 2 / TFE / P terpolymer), are typically used in applications where resistance to alkaline fluids and other high pH chemicals is critical. TFE / P binary copolymers have the best resistance to alkaline fluids. Terpolymers containing greater than about 10% by weight vinylidene fluoride units generally have no significant Better resistance to alkaline fluid properties. [0003] To fully achieve physical properties such as tensile strength, elongation and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F214/26C08K5/00C08L27/18C08K5/13C08K5/17C08K5/42C08K5/51
CPCC08K5/13C08K5/0025C08F214/265C08L27/18C08L27/12C08F214/26C08F214/18C08K5/00
Inventor W·W·施米格尔
Owner EI DU PONT DE NEMOURS & CO
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