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Silicone elastomer with microwave activity

A technology of siloxane and polysiloxane, which is used in the production of extruded products and molded products, which can solve the problems of unchangeable appearance, unsightly, and reduced ability to bond to the polymer matrix.

Inactive Publication Date: 2006-05-10
WACKER CHEM GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A common feature of all prior art silicone rubber compositions is the poor mechanical properties of the vulcanizate
In addition, related prior art fillers have poor surface treatability, thereby reducing their ability to bond to the polymer matrix
In addition, the beige to dark brown appearance of prior art ferrites is irreversible and unsightly, especially when used in visible areas

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] To prepare a high-density microwave-active crosslinkable silicone composition, which has improved thermal conductivity and is suitable for food contact, for example in the form of heating elements or baking molds, 100 parts of poly(dimethyl ) methyl vinyl siloxane into the kneader as initial charge. At 80° C., 2 parts of polydimethylsiloxane were added, followed by 15 parts of fine-grained silica, and the material was kneaded for 10 minutes after each addition step. Then, the material was further kneaded and baked at 160° C. for 3 hours. Next, 300 parts of magnetite having an average particle size of 150 µm was added at room temperature, and the material was kneaded. Then 3 parts of silazane and 1 part of water were added, and the mixture was kneaded at 70° C. for 1 hour. After cooling, the mixture is removed and placed on rolls or in a kneader to inject vulcanizing additives. The composition has a final vulcanized rubber hardness of 70 IRHD, has a density of at leas...

Embodiment 2

[0049] To make a highly microwave-active crosslinkable silicone composition for engineering use, 100 parts of poly(dimethyl)methylvinylsiloxane were placed into a kneader as an initial charge at room temperature. At 80° C., 2 parts of polydimethylsiloxane were added, followed by 15 parts of fine-grained silica, and the material was kneaded for 10 minutes after each addition step. Then, the material was further kneaded and baked at 160° C. for 3 hours. Next, 10 parts of manganese ferrite and 50 parts of magnetite, each having an average particle size of 50 µm, were added at room temperature, and the resulting material was kneaded. Then 2 parts of silazane are added, and the mixture is kneaded at 70° C. for 1 hour. After cooling, the mixture is removed and placed on rolls or in a kneader to inject vulcanizing additives. The composition had a final vulcanized rubber hardness of 55 IRHD, a density of 2 grams per cubic centimeter, and a high heating rate in commercially available...

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Abstract

The invention relates to silicone elastomers filled with magnetite or containing magnetite, their production and the use of compositions according to the invention after crosslinking for the production of extrudates and moldings and are microwave active or magnetic or both microwave active and magnetic.

Description

technical field [0001] The invention relates to silicone elastomers filled with magnetite or containing magnetite, their production and the use of compositions according to the invention after crosslinking for the production of extrudates and moldings and are microwave active or magnetic or both microwave active and magnetic. Background technique [0002] Silicone elastomers are not microwave active due to their chemical structure, eg lack of dipole moment. Silicone elastomers can therefore neither be heated nor crosslinked via microwave radiation. Therefore, there is no report on its vulcanization by microwave energy irradiation so far. [0003] For some applications, the prior art has disclosed a material selected from ferrites (having the chemical formula M x Fe y o z Oxide material) silicone elastomer with microwave active filler. For example, US 6,521,150 B1, EP 0945916 A2 and DE 3721427 A1 disclose silicone elastomers filled with ferrite for...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/10B29C47/00C08J3/24
CPCC08G77/20C08G77/398C08G77/42C08G77/455C08G77/458C08G77/46C08G77/70C08L83/04C08L83/00C08L2666/54
Inventor 于尔根·魏丁格尔
Owner WACKER CHEM GMBH
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