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Curable fluoroelastomer composition

A technology of composition and elastomer, applied in the field of curable fluoroelastomer composition

Inactive Publication Date: 2015-04-01
EI DU PONT DE NEMOURS & CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Additionally, curing agents require complex multi-step synthesis from expensive raw materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example

[0057] testing method

[0058] Curing properties

[0059] Curing properties were measured using a Monsanto MDR 2000 instrument under the following conditions :

[0060] Moving die head frequency: 1.66Hz

[0061] Swing range: ±0.5 degrees

[0062] Temperature: Unless otherwise stated, 190°C,

[0063] Sample size: The disc has a diameter of 1.5 inches (38mm)

[0064] Test Duration: 30 minutes

[0065] Record the following curing parameters :

[0066] m H : Maximum torque level, in dN·m

[0067] m L : Minimum torque level, in dN m

[0068] Tc90: Time to 90% of maximum torque, minutes

[0069] Test specimens were prepared by compounding the elastomer with appropriate additives as described in the formulations listed in the Examples below. Compounding takes place in a rubber mill. The milled composition was formed into sheets, and a 10 g sample was die cut into discs to form test specimens.

[0070] The compression set of the O-ring samples was determined accor...

example 1-2

[0082] The curable compositions were compounded on a two-roll rubber mill in the proportions shown in Table I. The compounded compositions are labeled in Table I as Example 1 (phthalhydrazide salt) and Example 2 (phthalhydrazide hydroxylamine salt). The cure characteristics of the compounded compositions are also shown in Table I. The O-rings were made by pressure curing the curable composition at a temperature of 190° C. for Tc90 plus 5 minutes, and then post-curing at 305° C. for 26 hours in a nitrogen atmosphere after the temperature was slowly increased from room temperature. Compression set and volume swell values ​​are also shown in Table I.

[0083] In order to compare the volume swell of the composition of the invention with that of the prior art composition, O-rings were made from a similar compound but containing 0.25 phr urea instead of phthalohydrazide salt as the curing agent. The urea cured O-ring exhibited a 15.7% volume swell after only 168 hours of exposure ...

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PUM

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Abstract

Fluoroelastomer compositions comprising fluoroelastomers having copolymerized units of a nitrile-containing cure site monomer are cured with a phthalhydrazide hydrazine or hydroxylamine salt curative.

Description

technical field [0001] The present invention relates to curable fluoroelastomer compositions, and more particularly to fluoroelastomer compositions comprising specific phthalohydrazide salts as curing agents. Background technique [0002] Fluoroelastomers have achieved excellent commercial success and are used in a wide variety of applications subject to harsh environments, particularly those end uses where exposure to high temperatures and corrosive chemicals occurs. For example, these polymers are often used in seals for aircraft engines, oil well drilling equipment, and sealing elements for industrial equipment operating at high temperatures. [0003] The excellent properties of fluoroelastomers are largely due to the stability and inertness of the co-fluorinated monomeric units that make up the majority of the polymer backbone in these compositions. Such monomers include vinylidene fluoride, hexafluoropropylene, tetrafluoroethylene, and perfluoro(alkyl vinyl) ethers. I...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L27/12C08K5/3465C08K5/24C08F214/26
CPCC08K3/04C08K5/25C08L27/18C08F214/26C08K5/32C08K5/3465C08L27/12C08K5/0025C08L2201/00
Inventor C. J. 比斯P. A. 莫肯
Owner EI DU PONT DE NEMOURS & CO
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