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PROCESS FOR PREPARING SiC-BONDED POLYETHERSILOXANES

A technology of polyether siloxane and siloxane, applied in the field of organopolysiloxane, can solve the problems of no practical significance of cost, no practical significance of quality defects, no mention of product characteristics, etc.

Active Publication Date: 2018-12-25
EVONIK OPERATIONS GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, such an overcatalysis is not practical either in terms of costs or in terms of quality defects in terms of discoloration, odor and viscosity of the organomodified polyorganosiloxanes prepared in this way
However, the document does not mention these important product features

Method used

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  • PROCESS FOR PREPARING SiC-BONDED POLYETHERSILOXANES
  • PROCESS FOR PREPARING SiC-BONDED POLYETHERSILOXANES

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0100] Example 1 (non-inventive):

[0101] First add 30.8g (75mmol) of poly(methylhydrogen)polydimethylsiloxane to a 250ml three-necked flask equipped with a contact thermometer, a precision glass stirrer and a reflux condenser, and its gas volume method records SiH value 2.44 eq / kg, and 87.4 g (101.5 mmol) of allyl alcohol-started ethylene oxide / propylene oxide based polyether (propylene oxide content 26% by weight) with an iodine value of 30.5 g / 100 g, heated to 70°C in 7 minutes by a heating mantle under stirring (400 rpm). The reaction was started by adding 5 ppmw of platinum in the form of an ethylene-activated Karstedt catalyst according to EP 1 520 870 B1 dissolved in decamethylcyclopentasiloxane. To check the conversion of the exothermic reaction, samples were taken every 3 minutes during the first 30 minutes and weighed in the decomposition flask. The respective SiH conversions were then determined by the volumetric method in a burette by decomposition of the weighe...

Embodiment 2

[0102] Embodiment 2 (non-inventive):

[0103] In the 250ml three-necked flask that is equipped with contact thermometer, precise glass stirrer and reflux condenser, first add the polyether siloxane prepared in the embodiment 1 of 6.2g (5wt%, based on whole mixture), and 87.4g ( 101.5 mmol) of an allyl alcohol-initiated ethylene oxide / propylene oxide based polyether (propylene oxide content 26% by weight) with an iodine number of 30.5 g / 100 g was heated under stirring (400 rpm) The jacket was heated to 70°C within 7 minutes. By immediately adding 30.8g (75mmol) of poly(methylhydrogen)polydimethylsiloxane, which had a SiH value of 2.44eq / kg by gas volumetric method, and 5ppmw dissolved in decamethylcyclopentasiloxane Platinum in alkanes in the form of an ethylene-activated Karstedt catalyst according to EP 1520 870 B1 starts the reaction. To check the conversion of the exothermic reaction, samples were taken every 3 minutes during the first 30 minutes and weighed in the decomp...

Embodiment 3

[0104] Embodiment 3 (of the present invention):

[0105] In the 250ml three-neck flask that is equipped with contact thermometer, precision glass stirrer and reflux condenser, first add the polyether siloxane prepared in the embodiment 1 of 6.2g (based on 5% of total mixture) and 30.8g (75mmol ) of poly(methylhydrogen)polydimethylsiloxane, whose SiH value measured by the gas volume method is 2.44eq / kg hydrogen siloxane, is heated to within 7 minutes by a heating mantle under stirring (400rpm) 70°C. An ethylene oxide / propylene oxide based polyether (propylene oxide content 26% by weight) started by immediate addition of 87.4 g (101.5 mmol) of allyl alcohol with an average molar mass of 843 g / mol and 5 ppmw Platinum in the form of an ethylene-activated Karstedt catalyst according to EP 1520870 B1 dissolved in decamethylcyclopentasiloxane starts the reaction. To check the conversion of the exothermic reaction, samples were taken every 3 minutes during the first 30 minutes and w...

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Abstract

A process for preparing SiC-bonded polyethersiloxanes by precious metal-catalysed addition of olefinically unsaturated polyethers onto siloxanes having SiH groups is described, in which, prior to commencement of reaction, the siloxane having SiH groups is mixed together with a polyethersiloxane, preferably by stirring, and then, in a second step, this preliminary mixture is contacted with an olefinically unsaturated polyether and with a precious metal catalyst and optionally further additives, preferably with further stirring, and the SiC bond formation reaction is conducted up to an SiH conversion, determined by gas-volumetric means, of at least 97%.

Description

technical field [0001] The present invention belongs to the field of organopolysiloxanes and relates to a process for preparing SiC-bonded polyether siloxanes. More specifically, the present invention relates to a process for the preparation of SiC-bonded polyether siloxanes by hydrosilylation reactions between siloxanes having SiH groups and ethylenically unsaturated polyethers. Background technique [0002] Prepared by hydrosilylation of a liquid organopolysiloxane having at least one silicon-hydrogen group per molecule with a silicone-free liquid organic compound containing at least one ethylenic carbon-carbon double bond per molecule Organomodified organopolysiloxanes are known. [0003] SiC-bonded organomodified siloxanes, in particular polyether siloxanes, are an industrially very important class of substances because of their broadly adjustable surfactant properties. An established route for the preparation of these substances is the platinum metal-catalyzed additio...

Claims

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Application Information

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IPC IPC(8): C08G77/46
CPCC08G77/46C08G77/12C08G77/06C08L71/00C08K5/56C08L83/00C08G77/70C08G77/38
Inventor W·克诺特D·温德拜尔
Owner EVONIK OPERATIONS GMBH
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