Preparation method for 107 silicon rubber with controllable viscosity
A technology of silicone hydroxyl sealing and polydimethylsiloxane, which is applied in the field of polydimethylsiloxane preparation technology, can solve the problems of difficult dispersion, low reactivity, poor product transparency, etc., and save production costs , Improve product quality and improve production efficiency
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Embodiment 1
[0011] Add 3500g of dimethyldichlorosilane hydrolyzate and 70g of 5% NaOH solution into a 5000mL reactor, stir, control the temperature at 90°C, react for 3 hours, separate and remove the water layer, wash the hydrolyzate with distilled water until neutral . The temperature is controlled at 70°C, and the water is removed under a vacuum of 0.05 MPa. The low boiling water carried by the removed water is returned to the reaction kettle through the balance tube. Then heat up to 110°C, spray 7g of alkali glue with a concentration of 1% tetramethylammonium hydroxide, catalyze polymerization, and control it with an online viscometer. When the viscosity increases to the required viscosity, continue to heat up to 180°C, and control the vacuum degree to 0.095 Above MPa, decompose the catalyst and remove low molecules at the same time to obtain good transparency and viscosity of 5000-200000mm 2 / s 107 silicone rubber.
Embodiment 2
[0013] Add 3500g of dimethyldichlorosilane hydrolyzate and 105g of 5% NaOH solution into a 5000mL reactor, stir, control the temperature at 90°C, react for 2 hours, separate and remove the water layer, wash the hydrolyzate with distilled water until neutral . The temperature is controlled at 70°C, and the water is removed under a vacuum of 0.05 MPa. The low boiling water carried by the removed water is returned to the reaction kettle through the balance tube. Then heat up to 100°C, spray and add 14g of alkali glue with a concentration of 1% tetramethylammonium hydroxide, catalyze polymerization, and control it with an online viscometer. When the viscosity increases to the required viscosity, continue to heat up to 180°C, and control the vacuum degree to 0.095 Above MPa, decompose the catalyst and remove low molecules at the same time to obtain good transparency and viscosity of 5000-200000mm 2 / s 107 silicone rubber.
Embodiment 3
[0015] Add 3500g dimethyldichlorosilane hydrolyzate and 140g 5% NaOH solution into a 5000mL reactor, stir, control the temperature at 90°C, react for 2 hours, separate and remove the water layer, wash the hydrolyzate with distilled water until neutral . The temperature is controlled at 70°C, and the water is removed under a vacuum of 0.05 MPa. The low boiling water carried by the removed water is returned to the reaction kettle through the balance tube. Then heat up to 120°C, spray and add 28g of alkali glue with a concentration of 1% tetramethylammonium hydroxide, catalyze polymerization, and control it with an online viscometer. When the viscosity increases to the required viscosity, continue to heat up to 180°C, and control the vacuum degree to 0.095 Above MPa, decompose the catalyst and remove low molecules at the same time to obtain good transparency and viscosity of 5000-200000mm 2 / s 107 silicone rubber.
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