Catalyst for organopolysiloxane as well as preparation method and application of catalyst

A technology of polysiloxane and catalyst, which is applied in organic chemistry, silicon organic compounds, chemical instruments and methods, etc., can solve the problems of difficult control of polymer end group structure, affecting product performance, etc., and achieve good industrial application prospects and performance Stable, low hydroxyl content effect

Pending Publication Date: 2019-04-12
WANHUA CHEM GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The silicon alkoxide of tetramethylammonium hydroxide or potassium hydroxide needs to be kept away from the air. They can easily absorb moisture in the air. It is difficult to control the structure of the end group of the object, which will eventually affect the performance of the product

Method used

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  • Catalyst for organopolysiloxane as well as preparation method and application of catalyst
  • Catalyst for organopolysiloxane as well as preparation method and application of catalyst
  • Catalyst for organopolysiloxane as well as preparation method and application of catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] 1) Catalyst preparation: In a four-necked flask equipped with mechanical stirring, nitrogen, thermometer, and water separator, add potassium hydroxide aqueous solution (60wt%) 16.7g, trifluoropropylmethylcyclotrisiloxane 84g, benzene 60ml, heated to reflux under stirring, the solid gradually dissolved to form a uniform solution, and the generated water was removed by azeotropic water separator. After collecting 8.29g of water, it was reacted at constant temperature for 1 hour, and then the remaining benzene was evaporated at normal pressure, and then in Low volatile matter was extracted under reduced pressure at 60°C and 20mbar to obtain a colorless and transparent oil. The base value of the catalyst is obtained by acid-base titration, so that the n value can be converted, see Table 1 for details.

[0050] 2) Cyclosiloxane polymerization: After fully replacing the 2L planetary mixer with nitrogen, add 1000g of octamethylcyclotetrasiloxane to the kettle, dehydrate at 50°...

Embodiment 2

[0052] 1) Preparation of catalyst: In a four-necked flask equipped with mechanical stirring, nitrogen, thermometer, and water separator, add potassium hydroxide aqueous solution (60wt%) 16.7g, trifluoropropylmethylcyclotrisiloxane 84g, toluene 60ml, stirred and heated to reflux, the solid gradually dissolved to form a uniform solution, and the generated water was azeotropically removed by a water separator. After collecting 8.29g of water, it was reacted at a constant temperature for 1 hour, and then the remaining toluene was evaporated at normal pressure, and then in Low volatile matter was extracted under reduced pressure at 60°C and 20mbar to obtain a colorless and transparent oil.

[0053] 2) Cyclosiloxane polymerization: After the 2L planetary mixer was fully replaced by nitrogen, 1000g of octamethylcyclotetrasiloxane and 11.62g of tetramethyltetravinylcyclotetrasiloxane were added to the kettle, and the Dehydrate at 10mbar for 1h, then use nitrogen to break the air, add 41...

Embodiment 3

[0055] 1) Preparation of catalyst: In a four-necked flask equipped with mechanical stirring, nitrogen, thermometer, and water separator, 16.7 g of potassium hydroxide aqueous solution (60 wt %), 84 g of trifluoropropylmethylcyclotrisiloxane, and two With 60ml of toluene, heat up to reflux under stirring, the solid gradually dissolves to form a homogeneous solution, use a water separator to azeotropically remove the generated water, after collecting 8.29g of water, react at a constant temperature for 1 hour, then evaporate the remaining toluene under normal pressure, and then Low volatile matter was extracted under reduced pressure at 60°C and 20 mbar to obtain a colorless and transparent oil.

[0056] 2) Polymerization of cyclosiloxane: After fully replacing the 2L planetary mixer with nitrogen, add 1000g of octamethylcyclotetrasiloxane to the kettle, dehydrate at 50°C and 10mbar for 1 hour, then use nitrogen to break the air, and add 500 67.57g of vinyl-terminated polydimethy...

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Abstract

The invention relates to a catalyst for organopolysiloxane as well as a preparation method and application of the catalyst. The catalyst for the organopolysiloxane is a trifluoropropylmethyl silicon alkoxide of an alkali metal hydroxide or a quaternary ammonium base or a quaternary phosphonium base; the preparation method of the catalyst for the organopolysiloxane comprises the following steps: reacting the alkali metal hydroxide or the quaternary ammonium base or the quaternary phosphonium base with trifluoropropylmethylcyclotrisiloxane at 50-160 DEG C, removing water in the system by utilizing solvent azeotropic distillation, and performing vacuum removal on a solvent and low-volatile matter to obtain the catalyst product; and the catalyst can be used for a ring-opening polymerization reaction of cyclosiloxane. The catalyst for the organopolysiloxane provided by the invention does not absorb water easily, has low viscosity and is easy to take for use; the organopolysiloxane preparedby using the catalyst has a low content of hydroxyl and stable performance; and the catalyst has very good industrialized application prospects.

Description

technical field [0001] The invention relates to a catalyst for catalyzing the homopolymerization or copolymerization of cyclosiloxane, its preparation method and application. Background technique [0002] Organopolysiloxane is the earliest organosilicon compound, the largest variety, and the most comprehensive research on a class of organosilicon polymers. Its skeleton main chain is composed of alternating silicon and oxygen atoms and organic groups (R) are connected to the silicon atoms, and its structural formula is (RnSiO4-n / 2)m. Due to its special structure, organopolysiloxane has a variety of excellent physical and chemical properties, such as high and low temperature resistance, weather resistance, oxidation resistance, mold release, hydrophobicity and physiological inertness. It is the first Elemental polymers that have been applied in industry occupy an indispensable position in polymer materials. [0003] At present, there are mainly two synthesis methods of organ...

Claims

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Application Information

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IPC IPC(8): C08G77/08C07F7/08C07F9/54
CPCC07F7/0874C07F9/5407C08G77/08
Inventor 封玲珑张聪颖刘志锋马伟曹骏杨继朋杨慧雅卢福广王家发
Owner WANHUA CHEM GRP CO LTD
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