Method for preparing controllable viscosity hydroxyl-terminated polydimethylsiloxane
A dimethylsiloxane and hydroxyl-blocked technology, which is applied in the field of production of hydroxyl-blocked polydimethylsiloxane with controllable viscosity, can solve the problems of difficult control of viscosity and low laboratory reproducibility, and reduce the Cross-linking, the effect of uniform and transparent products
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[0017] Example 1
[0018] Hydrolysate pretreatment: add 300g of hydrolysate and 200g of water to a 500mL three-necked flask, stir at 50~75℃ for 30min, add 20ppm reagent A (reagent A is anion exchange resin and activated carbon), stir for 30min and add 20ppm Reagent B, adjust pH=7.1, stop stirring, stand still and separate to obtain the desired hydrolysate.
[0019] Alkali gum preparation: add 150g DMC into a 250mL three-necked flask, add 0.5g KOH after dehydration at 50-120°C, polymerize at 130-150°C to obtain KOH alkali gum.
[0020] 107 Silicone rubber synthesis: Put the pre-treated hydrolysate into a 500mL reactor, heat up, and dehydrate under vacuum. After the material is dehydrated, add 55ppm KOH alkali gum, and polymerize at 100°C. When the reaction system reaches the required viscosity, add phosphoric acid aqueous solution After neutralization, the system removes low molecular weight to no distillate outflow at a suitable temperature and vacuum degree, and obtains 107 silicon...
Example Embodiment
[0021] Example 2
[0022] Hydrolysate pretreatment: add 300g of hydrolysate and 200g of water to a 500mL three-necked flask, stir at 50~75℃ for 30min, add 20ppm reagent A (reagent A is anion exchange resin), add 30ppm reagent B after stirring for 30min , Adjust pH=7.1, stop stirring, stand still, separate to obtain the desired hydrolysate.
[0023] Alkali gum preparation: add 150g DMC into a 250mL three-necked flask, add 0.5g KOH after dehydration at 50℃~120℃, and carry out polymerization at 130~150℃ to obtain KOH alkali gum.
[0024] 107 Silicone rubber synthesis: Put the pre-treated hydrolysate into a 500mL reactor, heat up, and dehydrate under vacuum. After the material is dehydrated, add 55ppm KOH alkali gum, and polymerize at 100°C. When the reaction system reaches the required viscosity, add phosphoric acid aqueous solution After neutralization, after neutralization, the system removes low fractions until no fractions will flow out under suitable temperature and vacuum, and th...
Example Embodiment
[0025] Example 3
[0026] Hydrolysate pretreatment: add 300g of hydrolysate and 200g of water into a 500mL three-necked flask, stir at 50~75℃ for 30min, add 20ppm reagent A (reagent A is silver nitrate), stir for 30min, add 20ppm reagent B, Adjust pH=7.1, stop stirring, let stand and separate to obtain the desired hydrolysate.
[0027] Alkali gum preparation: add 150g DMC into a 250mL three-necked flask, add 0.5g KOH after dehydration at 50℃~120℃, and carry out polymerization at 130~150℃ to obtain KOH alkali gum.
[0028] 107 Silicone rubber synthesis: Put the pre-treated hydrolysate into a 500mL reactor, heat up, and dehydrate under vacuum. After the material is dehydrated, add 55ppm KOH alkali gum, and polymerize at 120℃. When the reaction system reaches the required viscosity, add phosphoric acid aqueous solution After neutralization, after neutralization, the system removes low fractions at a suitable temperature and vacuum until no fractions will flow out, that is, 107 silicone...
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