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Telomerization-free method and device for continuously preparing polysiloxane from cyclosiloxane

A technology of cyclosiloxane and polysiloxane, which is applied in the field of polymer compound preparation, can solve the problems of incomplete research on the polymerization mechanism and poor application of anions, etc., and achieve the goal of avoiding quality differences, stable product quality, and easy mixing. Effect

Active Publication Date: 2015-06-24
杭州聚丰新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although cationic ring-opening equilibrium polymerization with acidic catalysts is currently used in laboratories and industries, the research on the polymerization mechanism is not yet thorough, and its application is far less extensive than that of anionic ring-opening polymerization.

Method used

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  • Telomerization-free method and device for continuously preparing polysiloxane from cyclosiloxane
  • Telomerization-free method and device for continuously preparing polysiloxane from cyclosiloxane

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Experimental program
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Effect test

Embodiment 1

[0038] When carrying out the continuous polysiloxane polymerization process without telomerization of cyclosiloxane, the basic catalyst, molecular weight regulator and monomer are divided into five steps: mixing, polymerization reaction, catalyst deactivation, devolatilization and refining. The ratio of servings is as follows:

[0039] Monomer: 100 parts of octamethylcyclotetrasiloxane;

[0040] Basic catalyst: 0.06 parts of potassium hydroxide;

[0041] Molecular weight modifier: 0.1 part of water;

[0042] Catalyst deactivator: 0.06 parts of phosphoric acid.

[0043] All reactions are all completed in the device for continuously preparing polysiloxane without telomerization of cyclosiloxane of the present invention, and its working steps are as follows:

[0044] ① Mixing: Potassium hydroxide in the basic catalyst storage tank 1, water in the molecular weight modifier storage tank 2 and octamethylcyclotetrasiloxane in the monomer storage tank 3 are respectively measured by...

Embodiment 2

[0052] When carrying out the continuous polysiloxane polymerization process without telomerization of cyclosiloxane, the basic catalyst, molecular weight regulator and monomer are divided into five steps: mixing, polymerization reaction, catalyst deactivation, devolatilization and refining. The ratio of servings is as follows:

[0053] Monomer: 100 parts of dimethylcyclosiloxane mixture;

[0054] Basic catalyst: 0.03 parts of tetramethylammonium hydroxide;

[0055] Molecular weight regulator: 0.11 parts of water;

[0056] Catalyst Killer: None.

[0057] All reactions are all completed in the device for continuously preparing polysiloxane without telomerization of cyclosiloxane of the present invention, and its working steps are as follows:

[0058] ① Mixing: Potassium hydroxide in the basic catalyst storage tank 1, water in the molecular weight modifier storage tank 2 and octamethylcyclotetrasiloxane in the monomer storage tank 3 are respectively measured by the metering pu...

Embodiment 3

[0066] When carrying out the continuous polysiloxane polymerization process without telomerization of cyclosiloxane, the basic catalyst, molecular weight regulator and monomer are divided into five steps: mixing, polymerization reaction, catalyst deactivation, devolatilization and refining. The ratio of servings is as follows:

[0067] Monomer: 100 parts of octamethylcyclotetrasiloxane;

[0068] Basic catalyst: 0.06 parts of potassium hydroxide;

[0069] Molecular weight regulator: 0.12 parts of water;

[0070] Catalyst deactivator: 0.06 parts of phosphoric acid.

[0071] All reactions are all completed in the device for continuously preparing polysiloxane without telomerization of cyclosiloxane of the present invention, and its working steps are as follows:

[0072] ① Mixing: Potassium hydroxide in the basic catalyst storage tank 1, water in the molecular weight modifier storage tank 2 and octamethylcyclotetrasiloxane in the monomer storage tank 3 are respectively measured...

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Abstract

The invention discloses a telomerization-free method for continuously preparing polysiloxane from cyclosiloxane. The method comprises the following steps of: uniformly mixing cyclosiloxane, a basic catalyst which is 0.01-0.1% of cyclosiloxane in percentage by weight and a molecular weight adjustor which is 0.01-0.15% of cyclosiloxane in percentage by weight; reacting for 1-4 hours; after reaction, inactivating the basic catalyst in a reaction liquid obtained by reaction; and then, devolatilizing to obtain polysiloxane. The invention further discloses a device for continuously preparing polysiloxane for implementing the method. With the adoption of continuous production process, quality difference among batches in batch production in the intermittent process is avoided, and the product quality is stable.

Description

technical field [0001] The invention relates to the field of preparation of polymer compounds, in particular to a method and device for continuously preparing polysiloxane without telomerization of cyclosiloxane. Background technique [0002] Polysiloxane is the base polymer of high temperature vulcanization silicone rubber, room temperature vulcanization silicone rubber and low temperature vulcanization silicone rubber. The vulcanized silicone rubber has excellent high and low temperature resistance, weather resistance, water repellency, electrical insulation, physiological inertia and other characteristics, and has been widely used in national defense, medical and health, industrial and agricultural production and people's daily life. [0003] The domestic polysiloxane production process mostly adopts the batch polymerization process, that is, after adding cyclosiloxane, basic catalyst and molecular weight regulator into the stirring tank, the liquid in the tank is heated ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G77/06C08G77/08C08G77/34
Inventor 顾雪萍冯连芳王嘉骏张才亮栗广奉
Owner 杭州聚丰新材料有限公司
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