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Silicone-polyether copolymer systems and process for preparing them by means of an alkoxylation reaction

A technology of polyether copolymer and polysiloxane, which is applied in chemical instruments and methods, transportation and packaging, chemical/physical processes, etc., can solve the problems of catalyst dosage and reaction time increase, uneconomical preparation, etc., and achieve a high reaction rate Falling effect

Active Publication Date: 2010-11-24
EVONIK OPERATIONS GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0020] Therefore, polyether-polysiloxanes with very long-chain polyethers can be prepared only with difficulty or not at all, since the reaction rate in hydrosilylation decreases continuously with increasing polyether chain length, so that quantitative SiH conversion is not possible, or the amount of catalyst and reaction time must be increased, making the preparation uneconomical

Method used

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  • Silicone-polyether copolymer systems and process for preparing them by means of an alkoxylation reaction
  • Silicone-polyether copolymer systems and process for preparing them by means of an alkoxylation reaction
  • Silicone-polyether copolymer systems and process for preparing them by means of an alkoxylation reaction

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Embodiment 1

[0119] As a chain starter, use has the structure m 1 =20,m 2 = 5, m 3 =m 4 =0,X=X 1 =Methyl polyether-polysiloxanes of the formula (I) used in excess according to the prior art with an average molar mass of 800 g / mol and containing 36% by weight of ethylene oxide units and 64% by weight of rings OH-terminated allyl polyethers of oxypropylene units, previously prepared by hydrosilylation of hydrogen siloxanes.

[0120] Under nitrogen, 200.0 g of this polyether-polysiloxane (containing 15-20% by weight of excess polyether with an average molar mass of 800 g / mol) and 0.10 g of hexacyanocobaltate were introduced into a 3-liter autoclave zinc DMC catalyst and heated to 130°C with stirring. The reactor was pumped down to an internal pressure of 30 mbar, so that any volatile constituents present were removed by distillation. To activate the DMC catalyst, a portion of 40.0 g of propylene oxide was added. 15 minutes and after the start of the reaction (decrease in reactor intern...

Embodiment 2

[0123] As a chain starter, used is prepared by hydrosilylation and has the structure m 1 =61.5; m 2 = 1.6; m 3 = 4.9; m 4 =0,X=X 1 =Methyl polyether-polysiloxane, which uses a mass ratio of 41:17:42 of the following composition of terminal OH-functionalized allyl polyether and two methyl-terminated allyl polyethers Mixture preparation:

[0124] a) 18% by weight of ethylene oxide, 82% by weight of propylene oxide, 1400g / mol, R in formula (Ib) 13 = methyl,

[0125] b) 74% by weight of ethylene oxide, 26% by weight of propylene oxide, 3800g / mol, R in formula (Ib) 13 = methyl,

[0126] c) 42% by weight ethylene oxide, 58% by weight propylene oxide, 3800 g / mol.

[0127] Under nitrogen, 162.0 g of this polyether-polysiloxane (containing about 20% by weight excess polyether mixture) and 0.024 g of zinc hexacyanocobaltate DMC catalyst were added to a 3-liter autoclave and, under stirring, Heat to 130°C. The reactor was pumped down to an internal pressure of 30 mbar, so that ...

Embodiment 3

[0130] As a chain starter, used is prepared by hydrosilylation and has the structure m 1 =61.5; m 2 = 6.5; m 3 =m 4 =0,X=X 1 =methyl polyether-polysiloxane prepared using a mixture of three terminal OH-functionalized allyl polyethers in the mass ratio 36:6:58 of the composition:

[0131] a) 10% by weight of ethylene oxide, 90% by weight of propylene oxide, 1500 g / mol,

[0132] b) 58% by weight ethylene oxide, 42% by weight propylene oxide, 1300 g / mol,

[0133] c) 42% by weight ethylene oxide, 58% by weight propylene oxide, 3800 g / mol.

[0134] Under nitrogen, 159.0 g of this polyether-polysiloxane (containing about 20% by weight of excess polyether mixture) and 0.031 g of zinc hexacyanocobaltate DMC catalyst were added to a 3-liter autoclave and, under stirring, Heat to 130°C. The reactor was pumped down to an internal pressure of 30 mbar, so that any volatile constituents present were removed by distillation. To activate the DMC catalyst, a portion of 21.0 g of propyl...

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Abstract

Process for the preferential alkoxylation of silicone-polyether copolymers either alone or in compositions thereof containing, for example, excess polyether by use of double metal cyanide catalysts.

Description

technical field [0001] The invention relates to a double metal cyanide-catalyzed alkoxylation of polysiloxane-polyether copolymers and their mixtures with polyetherols to obtain hydrophobic and hydrophilic structural units A method for high molecular weight polysiloxane-polyether copolymer systems. Background technique [0002] Polysiloxane-polyether copolymers are a class of substances used in a variety of industrial applications, for example, as surfactants, emulsifiers, wetting and dispersing agents, surface coating leveling agents, lubricants, as Auxiliaries for tertiary petroleum recovery, as textile auxiliary for softening fibers, yarns or sheet-like textile products, as defoamers, as cosmetic additives (emulsifiers) and as foam stabilizers (especially in polyurethane foams) . [0003] Polyether-polysiloxanes can be used in the various applications mentioned above because their properties, especially their hydrophilic / hydrophobic balance, The appropriate structure o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G77/46C08G77/38B01F17/54C08L83/12C09K23/54
CPCC08G65/336C08G65/2663C08L2205/05C08G65/2639
Inventor W·克诺特F·舒伯特F·亨宁
Owner EVONIK OPERATIONS GMBH
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