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Crosslinkable organoysiloxane compositions

A composition and cyclosiloxane technology, applied in the field of vulcanized products, can solve the problems of low strength and low elastic modulus value, etc.

Active Publication Date: 2020-11-13
WACKER CHEM GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The vulcanizate has good flow properties but low strength, i.e. low modulus of elasticity values

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0162] Cycle mixture 1

[0163] 52.92 g (630 mmol) of anhydrous sodium bicarbonate (commercially available from Sigma-Aldrich Chemie GmbH, D-Steinheim) in 250 mL of dry acetone (≦0.01% water; commercially available from VWR International GmbH, D-Darmstadt) and 49.84 g (630 mmol) of anhydrous pyridine (commercially obtained from Sigma-Aldrich Chemie GmbH, D-Steinheim) were first added under nitrogen atmosphere. Then 128.00 g (630 mmol) of vinylphenyldichlorosilane (commercially available from Gelest, Inc., 11 East Steel Rd., Morris-ville, PA 19067) dissolved in 190 mL of dry acetone was added dropwise over 1 hour , and then the mixture was stirred at room temperature for 3 hours. The mixture was then filtered and the solid residue was washed with 180 mL of dry acetone. The combined filtrates were freed of solvent and volatile components at 80° C. and 1 mbar, and the oily residue was filtered again. 88.6 g of colorless oil (recycle mixture 1) were obtained according to 29 Si...

Embodiment 2

[0166]The procedure described in Example 1 was repeated, but with the following modifications: 50.0 g of 1,3,5-trimethyl-1,3,5-trivinylcyclotrisiloxane (CAS 3901-77-7 ; commercially available from abcr GmbH, D-Karlsruhe) and 59.23 g of 1,4-bis(dimethylsilyl)benzene instead of recycle mixture 1. The measurement results are summarized in Table 1.

Embodiment 3

[0168] The procedure described in Example 1 was repeated with the following modification: 47.76 g of 4,4'-bis(dimethylsilyl)biphenyl was used instead of 34.7 g of 1,4-bis(dimethylsilyl) benzene. The measurement results are summarized in Table 1.

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PUM

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Abstract

The invention relates to organosiloxane compositions which can be crosslinked by hydrosilylation reaction and contain: (A) cyclosiloxanes of formula (I): [RaR1 bR2 cSiO2 / 2]m wherein the radicals and indices have the meaning given in claim 1, with the proviso that a + b + c is equal to 2, at least 3 radicals R1 are present per siloxane molecule (A) and at least m-3 radicals R2 are present per siloxane molecule (A), (B) organosilicon compounds having two Si-bonded hydrogen atoms and at least one aromatic radical and (C) catalysts that promote the addition of Si-bonded hydrogen to aliphatic multiple bonds. The invention also relates to a method for the production thereof and to the use thereof and vulcanizates obtainable therefrom.

Description

technical field [0001] The present invention relates to hydrosilylation-crosslinkable organosiloxane compositions, to a process for their production, and to their use and vulcanizates obtainable therefrom. Background technique [0002] Organopolysiloxane resins comprising reactive units with aliphatic carbon-carbon multiple bonds can be hydrosilylated / addition-reacted with a suitable coupling agent having two reactive SiH functional groups or with at least three reactive SiH functional groups. SiH-functional crosslinkers perform crosslinking in the presence of usually platinum-containing catalysts. Compared to organic systems such as unsaturated polyester resins or epoxy resins, vulcanized organopolysiloxane resins have the advantage of combining high UV resistance with high heat resistance. Also, organopolysiloxane resins have a low dielectric constant and good stability to chemicals. For these reasons, organopolysiloxane resins are used, for example, as potting compounds...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/04
CPCC08G77/12C08G77/20C08G77/80C08L83/04C08K5/56C08L83/00
Inventor 德特勒夫·奥斯藤多尔夫
Owner WACKER CHEM GMBH
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