Polyurethane resin for medium-soft organic silicon modified high-physical-property surface layer and preparation method of polyurethane resin
A polyurethane resin and organosilicon technology is applied in the field of polyurethane resin for modified high-physical property surface layer of medium-soft organosilicon and its preparation field. It can ensure the flexural resistance, eliminate the existence of free small molecular silicone oil, and achieve the effect of soft hand feeling.
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Embodiment 1
[0057] Add 72 parts of polycarbonate polyol (molecular weight 2000) and 28 parts of polyether polyol (molecular weight 2000) into the reaction kettle, heat the reaction kettle to 100°C, vacuum dehydrate for about 1 hour, and cool down to 50°C; Add 150 parts of dimethylformamide, 1.1 parts of 1,4-butanediol, 6.8 parts of ethylene glycol, and 35 parts of diphenylmethane diisocyanate, stir evenly, raise the temperature to 70°C, and react for about 50 minutes; then add 6 Parts of diaminopolysiloxane, reacted at 70°C for 50 minutes; then, added 4 parts of diphenylmethane diisocyanate at 70°C, reacted for 20 minutes, added 0.02 parts of organic bismuth catalyst, and continued to react for 30 minutes; Add the remaining 4.3 parts of diphenylmethane diisocyanate in batches to the reaction kettle for chain extension reaction. The feeding interval of each step is 40-60 minutes, and the reaction temperature is 70°C. Dilution is performed in three steps, viscosification and dilution are ca...
Embodiment 2
[0064] Add 72 parts of polycarbonate polyol (molecular weight 2000) and 28 parts of polyether polyol (molecular weight 2000) into the reaction kettle, heat the reaction kettle to 100°C, vacuum dehydrate for about 1 hour, and cool down to 50°C; Add 150 parts of dimethylformamide, 1.1 parts of 1,4-butanediol, 6.8 parts of ethylene glycol, and 35 parts of diphenylmethane diisocyanate, stir evenly, raise the temperature to 70°C, and react for about 50 minutes; then add 3 Parts of diaminopolysiloxane, reacted at 70°C for 50 minutes; then, added 4 parts of diphenylmethane diisocyanate at 70°C, reacted for 20 minutes, added 0.02 parts of organic bismuth catalyst, and continued to react for 30 minutes; Add the remaining 4.2 parts of diphenylmethane diisocyanate in batches to the reaction kettle for chain extension reaction. The feeding interval of each step is 40-60 minutes, and the reaction temperature is 70°C. Dilution is performed in three steps, viscosification and dilution are ca...
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