Low-temperature-resisting crude silicon rubber
A silicone rubber raw rubber, low temperature resistance technology, applied in the field of polymer compound preparation technology, can solve the problems of low product molecular weight, low glass transition temperature, long reaction time, etc., to achieve simple polymerization process and low glass transition temperature , Molecular weight controllable effect
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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 into it and heat up 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 heat up 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 in a vacuum state 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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