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Low-temperature-resisting crude silicon rubber

A technology of raw silicone rubber and low temperature resistance is applied in the field of preparation technology of polymer compounds, which can solve the problems of low glass transition temperature, long reaction time and low molecular weight of products, and achieves low glass transition temperature and controllable molecular weight. , the effect of simple polymerization process

Active Publication Date: 2012-07-04
SHANDONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although the polysiloxane prepared above has a low glass transition temperature (Tg) and does not crystallize at low temperature, there are problems that the reaction time is too long and the molecular weight of the product is low

Method used

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  • Low-temperature-resisting crude silicon rubber
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  • Low-temperature-resisting crude silicon rubber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 400g octamethylcyclotetrasiloxane (D 4 ) and 77g hexaethylcyclotrisiloxane (D 3 Et ) was added to the equipped with stirring bar, N 2 In the reactor with conduit and thermometer, dehydrate under reduced pressure at 60°C for 2h, then pass dry nitrogen and heat up to 130°C, add 2.58g tetramethyltetravinylcyclotetrasiloxane (D 4 Vi ) and 3.99g potassium hydroxide silicon alkoxide, start to polymerize, and react for 2h. After the polymerization reaction is completed, continue to heat up to 200°C, remove small molecular low boilers in the material under vacuum for 1 hour, cool to room temperature and discharge to obtain low temperature resistant raw silicone rubber. The ethyl content, vinyl content, molecular weight and its distribution and volatile content of the product were measured, and the results are listed in Table 1. The DSC of low-temperature-resistant raw silicone rubber is listed in Figure 1.

Embodiment 2

[0024] 400g octamethylcyclotetrasiloxane (D 4 ) and 77g hexaethylcyclotrisiloxane (D 3 Et ) was added to the equipped with stirring bar, N 2 In the reactor with conduit and thermometer, dehydrate under reduced pressure at 60°C for 2h, then pass dry nitrogen and raise the temperature to 130°C, add 3.23g of tetramethyltetravinylcyclotetrasiloxane (D 4 Vi ) and 3.99g potassium hydroxide silicon alkoxide, start to polymerize, and react for 2h. After the polymerization reaction is completed, continue to heat up to 200°C, remove small molecular low boilers in the material under vacuum for 1 hour, cool to room temperature and discharge to obtain low temperature resistant raw silicone rubber. The ethyl content, vinyl content, molecular weight and its distribution and volatile content of the product were measured, and the results are listed in Table 1.

Embodiment 3

[0026] 400g octamethylcyclotetrasiloxane (D 4 ) and 460g hexaethylcyclotrisiloxane (D 3 Et ) was added to the equipped with stirring bar, N 2 In the reactor with conduit and thermometer, dehydrate under reduced pressure at 60°C for 2h, then pass dry nitrogen and raise the temperature to 130°C, add 3.87g tetramethyltetravinylcyclotetrasiloxane (D 4 Vi ) and 6.72g potassium hydroxide silicon alkoxide, start to polymerize, and react for 2h. After the polymerization reaction is completed, continue to heat up to 200°C, remove small molecular low boilers in the material under vacuum for 1 hour, cool to room temperature and discharge to obtain low temperature resistant raw silicone rubber. The ethyl content, vinyl content, molecular weight and its distribution and volatile content of the product were measured, and the results are listed in Table 1.

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Abstract

The invention discloses a low-temperature-resisting crude silicon rubber which is obtained by polymerizing octamethyl cyclotetrasiloxane (D4), hexaethylcyclotrisiloxane (D3Et), 2,4,6,8-tetravinyl-2,4,6,8-tetramethylcyclotetrasiloxane (D4Vi), a catalyst and an accelerating agent and then heating, removing small molecular low-boiling-point substances in materials in vacuum and cooling to room temperature. According to the invention, the low-temperature-resisting crude silicon rubber product disclosed by the invention is stable, the glass transition temperature (Tg) of the rubber is low and is not crystallized at low temperature; polymerization process is simple and does not need a solvent, and the high-molecular-weight low-temperature-resisting crude silicon rubber can be obtained through severely controlling reaction conditions in short reaction time; and the rubber is high in yield, controllable in molecular weight, simple in posttreatment and easy to produce in a large scale.

Description

technical field [0001] The invention belongs to the field of preparation technology of polymer compounds, and in particular relates to a raw low-temperature-resistant silicone rubber and a preparation method thereof. Background technique [0002] Silicone rubber has many unique and excellent properties, such as high and low temperature resistance, insulation, water repellency, good weather resistance, good air permeability and low compression deformation rate, making it widely used in aerospace, chemical industry, machinery, textile, construction, transportation, medical It has been widely used in medicine, agriculture and other fields. [0003] As an applied material, the use value of rubber lies in its elasticity. However, with the advancement of human science and technology and the deepening of space exploration, especially in space exploration, it is necessary to use rubber products that can maintain elasticity and sealing performance at ultra-low temperatures, and can ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G77/20
Inventor 冯圣玉马德鹏谭景林卢海峰金凯凯
Owner SHANDONG UNIV
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