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Mixture of d/t type cyclic branched chain siloxane and its transformation product

A technology of branched chain siloxane and mixture, which is applied in the field of preparing D/T type cyclic branched chain siloxane mixture, which can solve the problems of high complexity and reducing the attractiveness of chemical methods

Active Publication Date: 2022-06-28
EVONIK OPERATIONS GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0028] The complexity involved in toluene recovery is considerable, reducing the attractiveness of otherwise very efficient chemical methods

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0101] 1) Preparation of cyclic branched siloxane with a target D / T ratio of 6:1 (of the present invention)

[0102] In a 500 ml four-necked round bottom flask equipped with a precision glass stirrer and a reflux condenser on top, 52.2 g (0.293 mol) methyltriethoxysilane was mixed with 65.3 g (0.176 mol) decamethyl ring while stirring. The pentasiloxanes were heated together to 60°C, 0.400 g of trifluoromethanesulfonic acid was added, and the mixture was equilibrated for 4 hours. Then 15.8 g of water and 4.0 g of ethanol were added and the mixture was heated to reflux temperature for an additional 2 hours. Add 10.6 g of water and 65.3 g (0.176 mol) of decamethylcyclopentasiloxane (D 5 ), the reflux condenser was replaced with a distillation system, and the components that were also volatile up to 90°C were distilled off over the next hour. Gas chromatographic analysis (GC) showed that the distillate consisted of ethanol / water. 200 ml of toluene were then added to the reacti...

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PUM

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Abstract

Describes mixtures of cyclic branched siloxanes having only D and T units, provided that the passable 29 The cumulative proportion of D units and T units with Si-alkoxy and / or SiOH groups determined by Si NMR spectroscopy is less than 2.0 mol %, preferably less than 1.0 mol %, and the branched organic modifications obtainable therefrom are also described. Sexual siloxane.

Description

technical field [0001] The present invention relates to a process for the preparation of mixtures of D / T cyclic branched siloxanes, to the mixtures of D / T cyclic branched siloxanes themselves, and to processing these siloxanes to obtain functionalized branches Methods of silicone and / or branched silicone oils. Background technique [0002] Regarding the nomenclature of M, D, T, Q used to describe the structural units of organopolysiloxanes in the context of this document, W. Noll, Chemie und Technologie der Silicone [Chemistry and Technology of the Silicones], Verlag Chemie GmbH, Weinheim (1960) pp. 2 onwards. [0003] In the preparation of organomodified siloxanes, especially siloxanes with branched functional groups, a difficulty often encountered is that concurrent competing processes in the reactive matrix may adversely affect the desired product. quality. [0004] Among these competing processes are condensation and equilibrium, which must be considered separately in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G77/44C08G77/20C08G77/12C08G77/08C08G77/06
CPCC08G77/06C08G77/08C08G77/12C08G77/20C08G77/44C08G77/70C08G77/10C08L83/04C08L83/00C08K5/42C07F7/0838C08G18/3893C07F7/0878
Inventor W·克诺特H·杜齐克
Owner EVONIK OPERATIONS GMBH