A kind of mercapto-terminated organosilicon polymer and its preparation method
A technology of hydroxy organosilicon and organosilicon, which is applied in the field of mercapto-terminated organosilicon polymers and its preparation, can solve the problems of difficult control of the number, few polar groups, single functional groups, etc., achieve low surface tension, mild reaction conditions, The effect of simple process route
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Embodiment 1
[0021] 1) Epoxy-terminated dimethyl polysiloxane resin (molecular weight: 500,000-1,000,000 g / mol) and diethanolamine are fed in a molar ratio of 1:4, then excess chloroform is added, and the reaction is carried out at room temperature for 12 hours. Then precipitate in methanol and dry to obtain hydroxydimethylpolysiloxane resin.
[0022] 2) Hydroxydimethylpolysiloxane resin and 4-mercaptobutyric acid are fed in a molar ratio of 1:9, and 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride and 4-Dimethylaminopyridine was used as a catalyst (the molar ratio of the two was 10:1), and excess chloroform was used as a solvent, and the reaction was carried out at room temperature for 24 hours. Then wash with water, wash with 5% sodium bicarbonate aqueous solution, and dry. After removing chloroform with a rotary evaporator, dry in a vacuum oven at 30°C for 24 hours to obtain a mercapto-terminated dimethyl polysiloxane.
[0023] Tested the structure of embodiment 1 product wi...
Embodiment 2
[0025] 1) Epoxy-terminated dimethyl polysiloxane resin (molecular weight 20000-50000 g / mol) and diethanolamine are fed in a molar ratio of 1:2, then excess chloroform is added, and the reaction is carried out at room temperature for 24 hours. Then precipitate in methanol and dry to obtain hydroxydimethylpolysiloxane resin.
[0026] 2) Hydroxydimethylsiloxane resin and 3-mercaptopropionic acid are fed in a molar ratio of 1:2, and 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride and 4 -Dimethylaminopyridine was used as a catalyst (the molar ratio of the two was 10:1), and excess chloroform was used as a solvent, and the reaction was carried out at room temperature for 24 hours. Then wash with water, wash with 5% aqueous sodium bicarbonate solution, and dry. After removing chloroform with a rotary evaporator, dry in a vacuum oven at 30°C for 24 hours to obtain a mercapto-terminated dimethyl polysiloxane resin.
[0027] Tested the structure of embodiment 2 with nuclear...
Embodiment 3
[0030] 1) Epoxy-terminated diphenyldimethylsiloxane resin (molecular weight 2000-4000 g / mol) and diethanolamine are fed in a molar ratio of 1:3, then excess chloroform is added, and the reaction is carried out at room temperature for 2 hours . Then precipitate in methanol and dry to obtain hydroxydiphenyldimethylsiloxane resin.
[0031] 2) Hydroxydiphenyldimethylsiloxane resin and 6-mercaptocaproic acid are fed in a molar ratio of 1:4, and 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloric acid is used to Salt and 4-dimethylaminopyridine were used as catalysts (the molar ratio of the two was 10:1), and excess chloroform was used as solvent, and the reaction was carried out at room temperature for 12 hours. Then wash with water, wash with 5% aqueous sodium bicarbonate solution, and dry. After removing chloroform with a rotary evaporator, dry in a vacuum oven at 30°C for 24 hours to obtain a mercapto-terminated diphenyldimethylsiloxane resin.
[0032]The mercapto-termi...
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