A kind of linear terminal silyl block polyether and its preparation method and application
A technology of silyl-terminated block and hydroxyl-terminated block, which is applied in the field of online silyl-terminated block polyether and its preparation, can solve the problems of unsuitability for sealant/adhesive and high price, and achieve broad application and flexibility Good, high yield effect
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[0052] The preparation method of above-mentioned linear terminal silyl block polyether comprises the following steps:
[0053] 1) Mix hydroxyl-terminated polytetrahydrofuran, hydroxyl-terminated polyethylene glycol or hydroxyl-terminated polypropylene glycol, and catalyst I, heat up to 60-140°C, add a chain extender, and react for 2-8 hours to obtain a hydroxyl-terminated block polyether;
[0054]2) Mix the hydroxyl-terminated block polyether with the catalyst II, then add an organosiloxane end-capping agent, and react at 70-100° C. for 1-6 hours to obtain a linear silyl-terminated block polyether.
[0055] Preferably, the catalyst 1 described in the step 1) is a tertiary amine acid-binding agent, the chain extender described in the step 1) is a diacid chloride, and the mol ratio of the catalyst 1 described in the step 1) to the chain extender is (2 ~4): 1.
[0056] Preferably, the tertiary amine acid-binding agent is at least one of triethylamine, N,N-diisopropylethylamine, ...
Embodiment 1
[0068] A kind of preparation method of linear terminal silyl block polyether comprises the following steps:
[0069] 1) 400g of hydroxyl-terminated polytetrahydrofuran with a number-average molecular weight of 1000 Daltons and 800g of hydroxyl-terminated polypropylene glycol with a number-average molecular weight of 2000 Daltons were dried in advance, and then mixed with 161.9g of triethylamine in a three-necked flask, and the Replace the air with dry nitrogen for 3 times, then heat to 60°C under stirring, add 159.2g of isophthaloyl chloride, stir and react for 4h, then add toluene to dilute the reaction mixture, filter, remove triethylamine hydrochloride, and spin evaporate The toluene was removed from the filtrate, and the remaining viscous liquid was vacuum-dried at 110°C for 24 hours to obtain the hydroxyl-terminated block polyether copolymer I; after testing, the hydroxyl-terminated block polyether copolymer I was the A-B type structure shown in formula (1) , the number a...
Embodiment 2
[0072] A kind of preparation method of linear terminal silyl block polyether comprises the following steps:
[0073] 1) 800g of hydroxyl-terminated polytetrahydrofuran with a number-average molecular weight of 2000 Daltons and 800g of hydroxyl-terminated polypropylene glycol with a number-average molecular weight of 4000 Daltons were dried in advance, and then mixed with 242.9g of triethylamine in a three-necked flask. Replace the air with dry nitrogen for 3 times, then heat to 140°C under stirring, add 140.6g of sebacoyl chloride, stir for 3 hours, add toluene to dilute the reaction mixture, filter to remove triethylamine hydrochloride, and spin the filtrate to remove toluene , the remaining viscous liquid was vacuum-dried at 110°C for 24 hours to obtain the hydroxyl-terminated block polyether copolymer II; after testing, the hydroxyl-terminated block polyether copolymer II was the A-B-A structure shown in formula (2), and the number average The molecular weight is 10748 Dalt...
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