A kind of shape memory polyurethane and its preparation method and application
A polyurethane and memory technology, which is applied in the field of shape memory polyurethane and its preparation, can solve the problems of short service life and poor self-repair ability of shape memory polyurethane, and achieve easy availability of raw materials, good shape memory performance and self-repair performance, and yield high effect
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[0036]Another aspect of the present invention provides a method for preparing the shape-memory polyurethane, comprising the steps of:
[0037] S01: Prepare monomer A and polyisocyanate in proportion, add an organic solvent, and add a catalyst to heat the reaction;
[0038] S02: Add polyol in proportion to react to obtain a shape-memory polyurethane solution.
[0039] Specifically, the monomer A in the step S01 is obtained by quaternizing the monomer B and a brominated saturated alkane. The structural formula of the monomer B is
[0040]
[0041] Wherein the substituent is defined according to the monomer A, and the monobrominated saturated alkane is R 4 -Br.
[0042] In specific step S01, the organic solvent is at least one of N,N-dimethylformamide, N,N-dimethylacetamide or dimethyl sulfoxide.
[0043] In specific step S01, the catalyst is an organotin catalyst. Such catalysts are commonly used polyurethane catalysts.
[0044] Specifically in the step S01, the heating...
Embodiment 1
[0051] This embodiment provides the shape memory polyurethane, which is prepared according to the following steps:
[0052] In the first step, add 11.9g of N-methyldiethanolamine and 30.5g of hexadecane bromide into a three-necked flask, raise the temperature to 100°C, stir mechanically for 12 hours to obtain a white solid, dissolve the product in 50ml of absolute ethanol, The solution was slowly poured into 500ml of ethyl acetate solution to obtain a white precipitate, which was washed and centrifuged for 3 times and then dried in a blast drying oven at 80°C to obtain a pure quaternized ammonium monomer. In the second step, under nitrogen protection, 16.8g of hexamethylene diisocyanate (HDI), 42.4g of quaternized monomer and 0.02wt.% catalyst dibutyltin dilaurate (DBTDL) and 40ml of DMF were successively added into the three-necked flask. The reaction temperature was raised to 80° C. and reacted for 1 hour, then 5.2 g of 1,4-butanediol (BDO) and 9.6 g of hexamethylene diisocy...
Embodiment 2
[0055] This embodiment provides the shape memory polyurethane, which is prepared according to the following steps:
[0056] In the first step, add 11.9g of N-methyldiethanolamine and 38.9g of docosane bromide to a three-necked flask, raise the temperature to 100°C, stir mechanically for 12 hours to obtain a white solid, and dissolve the product in 50ml of absolute ethanol , the solution was slowly poured into 500ml ethyl acetate solution to obtain a white precipitate, which was washed and centrifuged for 3 times and then dried in a blast oven at 80°C to obtain a pure quaternized ammonium monomer. In the second step, under nitrogen protection, 16.8g of hexamethylene diisocyanate (HDI), 50.8g of quaternized monomer and 0.02wt.% catalyst dibutyltin dilaurate (DBTDL) and 40ml of DMF were successively added into the three-necked flask. The reaction temperature was raised to 80°C, and the reaction was carried out for 4h. Finally, adjust the viscosity of the polyurethane prepolymer ...
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