Method for producing branched polyorganosiloxane

A technology of branched siloxane and siloxane, which is applied in the field of preparation of branched polyorganosiloxane, can solve problems such as complex silane, and achieve the effect of convenient processing and handling

Inactive Publication Date: 2009-02-11
EVONIK DEGUSSA GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] Drawbacks of existing methods are that they are complex and require handling of hydrolysis-sensitive silanes
Furthermore, the hydrolysis of chlorosilanes is accompanied by the release of aggressive hydrogen chloride, which limits this operation to corrosion-resistant plants and leads to ecological problems

Method used

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  • Method for producing branched polyorganosiloxane
  • Method for producing branched polyorganosiloxane
  • Method for producing branched polyorganosiloxane

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preparation example Construction

[0067] These branched siloxanes can also be prepared by combining the substrate to be hydrolyzed (E-A-B-L) with a suitable The hydrosilylation catalyst was added directly to the reaction mixture.

[0068] The siloxanes of the invention, especially those having the group -A-B-L, are especially useful in the preparation of polyurethane foams, preferably as foam stabilizers, and in the preparation of defoamer preparations.

Embodiment 1

[0084] has an average structure (CH 3 ) 3 SiO-[(CH 3 ) 2 SiO] 20 -[(CH 3 )HSiO] 5 -Si(CH 3 ) 3 The reaction of siloxane with cesium laurate

[0085] 40.5 g of this siloxane were first added to a 250 ml three-necked flask equipped with a stirrer, jacketed coil condenser and thermometer. At 50°C, 0.2 g of cesium laurate was added, then warmed to 130°C and stirred at 130°C for another 1 h. Gas volumetric hydrogen measurements yielded a 21% reduction in silane hydrogen. A yellowish, viscous product was obtained which 29 Si-NMR spectra (prepared with a Brucker AVANCE 400 NMR spectrometer with XWIN-NMR 3.1 evaluation software and tetramethylsilane as internal standard) show chemical shift signals from 10 to 7 ppm (M-units; 6.5% of total signal intensity %), -5 to -7ppm (M'-unit; 5.1% of total signal intensity), -18 to -23ppm (D-unit; 72.7% of total signal intensity), -35 to -38ppm (D'-unit ; 6.4% of total signal intensity) and -63 to -69 ppm (T-unit; 9.3% of total signal...

Embodiment 2

[0087] has an average structure (CH 3 ) 3 SiO-[(CH 3 ) 2 SiO] 20 -[(CH 3 )HSiO] 5 -Si(CH 3 ) 3 The reaction of siloxane with cesium laurate and subsequent hydrosilylation

[0088] 40.5 g of this siloxane were first added to a 250 ml three-necked flask equipped with a stirrer, jacketed coil condenser, dropping funnel and thermometer. At 50° C., 0.2 g of cesium laurate was added, the temperature was raised to 130° C. and stirred at 130° C. for another 1 h. Gas Volume Hydrogen Determination Silane Hydrogen was reduced by 21%. The reaction mixture was cooled to 88° C. and Karstedt catalyst (platinum-divinyltetramethyldisiloxane complex from ABCR, 15 ppm mass platinum based on the total weight of the batch) was added. At 88° C., 88 g of a pure propylene oxide-containing polyether (average molar mass 1000 g / mol) started with allyl alcohol and terminated with methyl groups were added dropwise. Afterwards, it was stirred at 88° C. for another 1.5 h, and then the mixture was...

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Abstract

The invention relates to a preparation method for organic branched polysiloxane, in particular to a preparation method for branched siloxane containing an R-SiO3/2 unit, wherein R is an organic group, and linear polysiloxane containing silicon hydride in a polymer chain reacts under the condition that no hydroxyl functional organic compound is existent in the presence of ammonium or metal carboxylate as a catalyst. The invention also relates to application of siloxane obtained by the preparation method to prepare polyurethane foam and antifoaming agent products.

Description

technical field [0001] The present invention relates to a process for the preparation of branched silicones from linear polysiloxanes containing silane hydrogens in the polymer chain. Background technique [0002] Due to the unique properties of silicones, such as water repellency, interfacial activity, thermal stability, etc., silicones are used in many technical fields. These areas include stabilization of polyurethane foams, use as emulsifiers, use in release coatings and many others. [0003] In general, these siloxanes have a linear or branched structure which is end-modified or modified in a comb-like manner. Branched siloxanes are of interest in several fields. Thus, for example, European patent EP 0 025 822 describes the use of branched siloxanes for the production of polyurethane foams. [0004] Branched siloxanes can be prepared according to the prior art by cohydrolysis of trifunctional silanes and siloxanes. Thus, European Patent Application EP 1 172 397 desc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G77/08C08G77/38C08G77/46C08J9/00C08L75/04C08L83/04C09K23/54
CPCC08K5/098C08G77/08C08G77/10
Inventor A·布吕克纳C·席勒C·蒙德
Owner EVONIK DEGUSSA GMBH
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