Preparation method for dyeable polyurethane film
A polyurethane film and polyurethane technology, which is applied in the field of polyurethane materials, can solve the problems of rare polyurethane dyeing effects, achieve the effects of improving dyeing rate and color fastness, easy operation, and strong color fastness
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Embodiment 1
[0031] 1) Add N,N-methylenebisacrylamide (MBA) and diethylenetriamine (DETA) with a molar ratio of 1:1.1 to the solvent N,N-dimethylformamide (DMF), at 40 React at ℃ for 24 hours to obtain a yellow-green amino-terminated hyperbranched polymer; the mass ratio of the total mass of N,N-methylenebisacrylamide and diethylenetriamine to N,N-dimethylformamide is 1 : 1.1; The synthetic route and structural formula of amino-terminated hyperbranched polymer are as figure 1 shown.
[0032] 2) Add isophorone diisocyanate and absolute ethanol with a molar ratio of 1:1.1 into the solvent N,N-dimethylformamide, and react at 0°C for 4 hours to obtain a blocking agent, in which isophorone The mass ratio of the total mass of ketone diisocyanate and dehydrated alcohol to N,N-dimethylformamide is 1:1.1; the synthetic route of end-capping agent is as follows figure 2 shown.
[0033] 3) The amino-terminated hyperbranched polymer with a mass ratio of 3:0.5 is mixed with an end-capping agent, and...
Embodiment 2
[0037] 1) Add N,N-methylenebisacrylamide (MBA) and diethylenetriamine (DETA) with a molar ratio of 1:1.2 to the solvent N,N-dimethylformamide (DMF), at 80 React at ℃ for 8 hours to obtain a yellow-green amino-terminated hyperbranched polymer; the mass ratio of the total mass of N,N-methylenebisacrylamide and diethylenetriamine to N,N-dimethylformamide is 1 :1.2;
[0038] 2) Add isophorone diisocyanate and absolute ethanol with a molar ratio of 1:1.2 into the solvent N,N-dimethylformamide, and react at 10°C for 2.5 hours to obtain a blocking agent, in which isoflurane The mass ratio of the total mass of ketone diisocyanate and dehydrated alcohol to N,N-dimethylformamide is 1:1.2;
[0039] 3) The amino-terminated hyperbranched polymer with a mass ratio of 3:1 is mixed with an end-capping agent, and reacted at 65° C. for 3 hours to obtain an end-capped hyperbranched polymer.
[0040] 4) Add solvent N,N-dimethylformamide to the polyurethane raw material, stir evenly, and configu...
Embodiment 3
[0043] 1) Add N,N-methylenebisacrylamide (MBA) and diethylenetriamine (DETA) with a molar ratio of 1:1.3 to the solvent N,N-dimethylformamide (DMF), at 60 React at ℃ for 20 hours to obtain a yellow-green amino-terminated hyperbranched polymer; the mass ratio of the total mass of N,N-methylenebisacrylamide and diethylenetriamine to N,N-dimethylformamide is 1 :1.4;
[0044] 2) Add isophorone diisocyanate and absolute ethanol with a molar ratio of 1:1.3 into the solvent N,N-dimethylformamide, and react at 15°C for 2 hours to obtain a blocking agent, in which isophorone The mass ratio of the total mass of ketone diisocyanate and absolute ethanol to N,N-dimethylformamide is 1:1.3;
[0045] 3) The amino-terminated hyperbranched polymer with a mass ratio of 3:1.5 is mixed with an end-capping agent, and reacted at 70° C. for 2 hours to obtain an end-capped hyperbranched polymer.
[0046] 4) Add solvent N,N-dimethylformamide to the polyurethane raw material, stir evenly, and configur...
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