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Organic silicone thixotropic agent and thixotropy addition type liquid silicone rubber

A thixotropic agent and silicone technology, applied in the field of silicone thixotropic agent and thixotropic addition type liquid silicone rubber, can solve the problems of limited improvement effect, high cost, complicated mixing process, etc., and achieve thixotropy and extrusion performance. Good, simple preparation method, promoting the effect of popularization and application

Active Publication Date: 2014-07-23
惠州市安品新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, silica is a powder, and the mixing process with liquid silicone rubber is complicated and costly. At the same time, it will have a negative impact on the light transmittance of silicone rubber, and the scope of application is limited. Organic small molecule thixotropic agents usually exist with The defects of poor compatibility and poor dispersion of the liquid silicone rubber system lead to limited improvement on the thixotropy of the system

Method used

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  • Organic silicone thixotropic agent and thixotropy addition type liquid silicone rubber
  • Organic silicone thixotropic agent and thixotropy addition type liquid silicone rubber
  • Organic silicone thixotropic agent and thixotropy addition type liquid silicone rubber

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preparation example Construction

[0083] It should be pointed out that the modified polysiloxane and the modified cyclosiloxane in the organosilicon thixotropic agent of the present invention can be prepared according to existing methods, or can be purchased. Wherein, the preferred preparation method of modified polysiloxane comprises the following steps:

[0084] Hydrogen-containing silicone oil and modified reactants containing terminal alkenyl groups are reacted in an inert gas environment and an organic solvent at 85-95°C with a platinum catalyst for 6-12 hours. After the reaction is completed, the modified product is obtained by distillation under reduced pressure. polysiloxane.

[0085] In the above preparation methods, the synthesis of hydrogen-containing silicone oil can be carried out with reference to existing methods to adjust the molecular structure of modified polysiloxane, such as viscosity, phenyl content, etc.; group, ether group, hydroxyl group, amine group or ester group, and compounds with ...

Embodiment 1

[0097] Preparation of modified cyclosiloxane Ⅰ:

[0098] In the four-neck flask, dry N 2 , join D 4 H (24.00g, 0.10mol, hydrogen content is 1.6125%), petroleum ether (100.00g) and Pt / IPA (0.15g, 60μg / g), stir and heat up to 85°C, drop allyl shrinkage with a constant pressure funnel Glyceryl ether (AGE) (57.08g, 0.50mol), after the dropwise addition, was reacted at 85°C for 6h, and after the reaction was completed, it was distilled under reduced pressure to obtain the modified cyclosiloxane I.

[0099] The hydrogen content of modified cyclosiloxane I was measured to be 0.1568%, and the modified group containing epoxy group ( The content is 0.53mol / 100g.

Embodiment 2

[0101] Preparation of modified cyclosiloxane II:

[0102] In the four-neck flask, dry N 2 , join D 4 H (24.00g, 0.10mol, hydrogen content is 1.6125%), hydroquinone monomethyl ether (0.09g, 0.00072mol), (petroleum ether (100.00g) and Pt / IPA (0.16g, 60μg / g), Stir and heat up to 85°C, add butyl acrylate (64.08g, 0.5mol) dropwise with a constant pressure funnel. After the dropwise addition, react at 85°C for 10h. After the reaction, distill under reduced pressure to obtain modified cyclosiloxane II.

[0103] The hydrogen content of modified cyclosiloxane II was measured to be 0.2486%, and the modified group containing ester group ( The content is 0.45mol / 100g.

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Abstract

The invention discloses an organic silicone thixotropic agent and a thixotropy addition type liquid silicone rubber. The organic silicone thixotropic agent comprises modified polysiloxane and modified cyclosiloxane; and the modification groups in the modified polysiloxane and modified cyclosiloxane at least comprise one group of epoxy group, ether group, hydroxyl group, amine group, and ester group. The modification group content of the modified polysiloxane is 0.01 to 0.80 mol / 100g, and the modification group content of the modified cyclosiloxane is 0.10 to 0.60 mol / 100g. The organic silicone thixotropic agent can further comprise silicone dioxide. The invention further discloses a thixotropy addition type liquid silicone rubber containing the organic silicone thixotropic agent. After the provided organic silicone thixotropic agent is mixed with liquid silicone rubber, the thixotropy of liquid silicone rubber can be improved, and thus the liquid silicone rubber can satisfy the specific application occasion such as mould-free encapsulation, and the like.

Description

technical field [0001] The invention belongs to the technical field of organic silicon materials, and relates to an organic silicon thixotropic agent and a thixotropic addition type liquid silicone rubber. technical background [0002] Liquid silicone rubber is a base material with self-leveling or thixotropic properties prepared from linear polyorganosiloxane with a medium degree of polymerization as the base polymer, various additives and additives. It can be extruded or injected according to the variety and application. After molding and coating, vulcanize and form elastomers in the atmosphere or under heating, including condensation type room temperature vulcanization silicone rubber, condensation type one-component RTV silicone rubber, addition type liquid silicone rubber, etc. Among them, the addition-type liquid silicone rubber is usually composed of a base polymer, a crosslinking agent, a catalyst and an inhibitor. According to the actual application and functional r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/04C08K3/36C08G77/38C08G77/46C08L83/07C08L83/05
Inventor 丁小卫刘珠欧阳冲廖义军
Owner 惠州市安品新材料有限公司
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