Preparation method of low-viscosity 107 silicone rubber
A silicone rubber, low-viscosity technology, used in the preparation of low-viscosity 107 silicone rubber, can solve problems such as difficulty in increasing viscosity accurately 107 viscosity, reducing yield, etc. Effect
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Embodiment 1
[0026] Hydrolyze dimethyldichlorosilane to obtain a hydrolyzate, distill off cyclosiloxane to obtain a linear body with a viscosity of 78mPa.s; add 2000Kg of linear body and 60Kg of sodium carbonate to the reaction kettle, raise the temperature to 200°C, and stir For the reaction, keep a negative pressure of -0.04MPa in the reaction kettle to continuously release water. During the reaction process, the viscosity continued to increase, and the viscosity was detected online. After the viscosity reached the predetermined viscosity of 800mPa.s, the normal pressure in the reactor was restored, filtered, and vacuumed at 150°C to remove low-molecular substances (mainly water) to obtain the product 107 The silicon rubber has a yield of 96.3% and a viscosity of 773mPa.s.
Embodiment 2
[0028] Dimethyldichlorosilane is hydrolyzed to obtain a hydrolyzate, and cyclosiloxane is distilled to obtain a linear body with a viscosity of 50mPa.s; 2000Kg of the linear body and all the sodium carbonate filtered in Example 1 are added to the reactor, Raise the temperature to 210°C, stir and react, and maintain a negative pressure of -0.05MPa in the reactor to continuously remove water. During the reaction process, the viscosity continued to increase, and the viscosity was detected online. After the viscosity reached the predetermined viscosity of 300mPa.s, the normal pressure in the reactor was restored, filtered, and vacuumed at 160°C to remove low-molecular (mainly water) substances to obtain the product 107 The silicon rubber has a yield of 97.6% and a viscosity of 313mPa.s.
Embodiment 3
[0030] Hydrolyze dimethyldichlorosilane to obtain a hydrolyzate, distill off cyclosiloxane to obtain a linear body with a viscosity of 120mPa.s; add 2000Kg of linear body and 40Kg of potassium carbonate to the reaction kettle, raise the temperature to 170°C, and stir For the reaction, keep a negative pressure of -0.06MPa in the reaction kettle to continuously release water. During the reaction process, the viscosity is continuously increasing, and the viscosity is detected online. After the viscosity reaches the predetermined viscosity of 1500mPa.s, the normal pressure in the reactor is restored, filtered, and the low-molecular (mainly water) substances are removed by vacuuming at 150°C to obtain the product 107 The silicon rubber has a yield of 97.9% and a viscosity of 1462mPa.s.
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