A kind of silicone-modified isocyanate prepolymer for solvent-free synthetic leather and preparation method thereof
A technology of isocyanate prepolymerization and synthetic leather, which is applied in the direction of textiles and paper making, can solve the problems of long curing time, unsatisfactory air and moisture permeability, and inability to solve solvent pollution, etc., and achieve excellent flexibility and air permeability, excellent air permeability Moisture breathability, excellent hand softness effect
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Embodiment 1
[0022] (1) Take by weighing 100g octamethylcyclotetrasiloxane and 61g tetramethyltetraphenylcyclotetrasiloxane and join in the there-necked flask with thermometer and condensation reflux device, N 2 protection, raised the temperature to 60°C, then added 4.83g of concentrated sulfuric acid, stirred for 30min, then added 7.5g of tetramethyldihydrodisiloxane, and stirred for 5h at 60°C. Sodium hydrogen neutralizes the reaction solution to neutrality, washes with water, filters, uses a rotary evaporator at 130°C to remove small molecule by-products, rotates for 4 hours, and filters under reduced pressure to obtain a hydrogen-terminated group-sealed product with a number average molecular weight of 3000. terminal methylphenylpolysiloxane.
[0023] (2) Weigh 100g of the hydrogen-terminated methylphenyl polysiloxane obtained in step (1) and 3.8g of allylamine into the reactor, raise the temperature to 50°C, and add 0.001g of H 2 PtCl 6 Catalyst, reacted for 4h to prepare amino-term...
Embodiment 2
[0026] (1) Weigh 100g of octamethylcyclotetrasiloxane and 57.5g of tetramethyltetraphenylcyclotetrasiloxane into the reactor, raise the temperature to 80°C, add 3.15g of concentrated sulfuric acid, and stir for 40min. Then add 11.3g of tetramethyldihydrodisiloxane, stir and react at 80°C for 5h. Rotary evaporation at ℃ to remove small molecular by-products, rotary evaporation for 4 hours, and filtration under reduced pressure to prepare a hydrogen-terminated methylphenyl polysiloxane with a number average molecular weight of 2000.
[0027] (2) Weigh 100g of hydrogen-terminated methylphenylpolysiloxane and 5.7g of allylamine into the reactor, raise the temperature to 60°C, and add 0.002g of H 2 PtCl 6 Catalyst, reacted for 4h to prepare amino-terminated methylphenylpolysiloxane.
[0028] (3) The amino-terminated methylphenyl polysiloxane obtained in the step (2) is dehydrated at room temperature to 120° C. for 4 hours under reduced pressure, and then used. Add 100g of isopho...
Embodiment 3
[0030] (1) Weigh 100g of octamethylcyclotetrasiloxane and 46g of tetramethyltetraphenylcyclotetrasiloxane into the reactor, raise the temperature to 75°C, add 4.38g of concentrated sulfuric acid, stir for 30min, then add 22.6g of tetramethyldihydrodisiloxane, stirred and reacted at 75°C for 5h, after the reaction, cooled to room temperature, neutralized to neutral with sodium bicarbonate, washed with water, filtered, and heated at 130°C with a rotary evaporator Rotary evaporation removed small molecular by-products, rotary evaporation for 4 hours, and filtration under reduced pressure to prepare a hydrogen-terminated methylphenylpolysiloxane with a number average molecular weight of 1000.
[0031] (2) Weigh 100g of hydrogen-terminated methylphenyl polysiloxane and 7.6g of allylamine into the reactor, heat up to 60°C, add 0.003g of H 2 PtCl 6 Catalyst, reacted for 4h to prepare amino-terminated methylphenylpolysiloxane.
[0032] (3) First heat the amino-terminated methylpheny...
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