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Fluoroelastomer composition comprising mineral oil

A technology of fluoroelastomer and composition, applied in the field of manufacturing the fluoroelastomer composition, can solve the problems of difficult reprocessing of vulcanized fluoroelastomer and the like

Inactive Publication Date: 2003-09-03
3M INNOVATIVE PROPERTIES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Scorching also creates a lot of waste; since vulcanized fluoroelastomers are difficult to reprocess, fluoroelastomers that cure outside the mold cavity usually have to be discarded

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-6 and comparative example C-1

[0077] Examples 1-6 and Comparative Example C-1 were made of fluoroelastomer FC-2174 to make the compositions shown in Table 1. Compositions are expressed in parts by weight per 100 parts by weight of fluoroelastomer, as is customary in the rubber industry. The properties of the fluoroelastomer compositions are listed in Tables 2-5.

[0078] Gum

[0079] C-1

[0080] The results in Table 2 illustrate that increasing the oil adsorbed on the carbon black did not significantly affect the cure performance as measured by the Moving Die Rheometer.

Embodiment 3

[0081] Example 3 has a significantly higher filler content due to the oiliness of the carbon black. This side effect can slightly affect some MDR values ​​by making the compound less flexible.

[0082] C-1

[0083] In all cases, scorch safety (denoted T3) increases with the use of oily carbon black (a flatter curve can be noticed). In fact, the T3 values ​​measured for all oil-containing samples are significantly higher than those of the comparative examples, and Example 3 (highest oil content) has a significantly lower compound viscosity (given by the Mooney scorch minimum).

[0084] C-1

[0085] These data show that the use of oil does not significantly degrade the physical properties of the fluoroelastomers used. Referring to Example 3, the difference in hardness and elongation is usually due to the use of higher loadings of filler in the fluoroelastomer, which is also the case here.

[0086] C-1

[0087] The rheovulcameter data...

Embodiment 7-10 and comparative example C-2 and C-3

[0089] In Examples 7-10, a fluoroelastomer compound was prepared from Dyneon E-15948, and 1.5% of calcium silicate adsorbed on oil-containing 70% by weight (also called oil-containing 70% active oil on calcium silicate) (represented as E-159481.5% in Table 6). Examples 8 and 10 also included carnauba wax, a common processing aid. The types and amounts of additives used are shown in Table 6. Comparative Examples C-2 and C-3 were made from E-15948 without oil. Comparative Example C-3 also contained carnauba wax. The properties of the compositions are listed in Tables 7-12.

[0090] Gum

[0091] C-2

[0092] The data show that there is not much difference in the rheological properties measured using the Goettfert MDR.

[0093] C-2

[0094] These results show that the mixture containing carnauba wax has slightly poorer scorch safety than the sample without carnauba wax but containing oil.

[0095] C-2

[0096] The data agai...

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PUM

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Abstract

The present invention provides the use of a mineral oil in a fluoroelastomer composition comprising a fluoroelastomer to improve the flow of said composition during processing to form an article therefrom and / or to improve the release from a mold of a vulcanized article produced from said fluoroelastomer composition. Further provided are a fluoroelastomer composition that includes a mineral oil, a method of making an article therewith and a method of preparing the fluoroelastomer composition.

Description

field of invention [0001] The present invention relates to fluoroelastomer compositions which exhibit improved flow properties when processed into products using eg extrusion or injection molding methods. The invention also relates to methods of making said fluoroelastomer compositions and methods of using such compositions to make products. Background of the invention [0002] Fluoroelastomers, specifically copolymers of vinylidene fluoride and other ethylenically unsaturated halogenated monomers such as hexafluoropropylene, have particular utility in high temperature applications such as seals, gaskets and visible liners, see e.g. , Brullo, R.A., "Fluoroelastomer Rubber for the Automotive Industry," Automotive Elastomer & Design, June 1985, "Prospects for Fluoroelastomer Sealing Materials in Automotive Applications," Materials Engineering, October 1988, and "Fluoroelastomers," Kirk- Othmer, Encyclopedia of Chemical Technology, Vol. 8, pp990-1005 (4th.ed., John Wiley & Son...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/00B29C33/58B29C33/60B29K19/00C08K3/00C08K3/04C08K9/12C08L27/12C08L27/16C08L91/00
CPCC08K9/12C08L27/16C08L91/00C08K3/04C08L27/12C08K9/00C08J5/06C08K7/04
Inventor S·F·科维林
Owner 3M INNOVATIVE PROPERTIES CO
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