Preparation method of toughened polyurethane film
A polyurethane film and polyurethane technology, applied in the field of toughening polyurethane film preparation, can solve the problem that the polyurethane toughening effect is not significant enough, the structure and performance of the polyurethane body material are not fully exerted, and the polyurethane elongation at break The toughening effect of the polyurethane film is not very good. Significant other issues
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[0037] see figure 1 Shown, the invention provides a kind of preparation method of toughened polyurethane film, comprises the following steps:
[0038] S1, the preparation of film casting solution; mix the poor solvent of polyurethane, N, N-dimethylformamide and the solvent with polarity lower than N, N-dimethylformamide into a ternary mixed solvent, wherein, the polyurethane The mass fraction of poor solvent is 5% to 45%; the mass fraction of N, N-dimethylformamide is 30% to 90%; the mass fraction of solvents with lower polarity than N, N-dimethylformamide is 5% to 30%;
[0039] Then the polyurethane prepolymer and ternary mixed solvent with a mass fraction ratio of 5%: 95% to 40%: 60% are uniformly stirred mechanically and then vacuum defoamed to prepare polyurethane casting liquid; wherein, the stirring temperature is 20 to 45 ℃, the stirring rate is 500~4000r / min, and the stirring time is 0.5~5h;
[0040] S2, coagulation bath preparation;
[0041] S3, scraping and coati...
Embodiment 1
[0055] The mass fraction ratio is 5%: 85%: 10% toluene, N, N-dimethylformamide and dioxane are blended into a ternary mixed solvent, and then the mass fraction ratio is 10%: 90% Polyether polyurethane prepolymer and ternary mixed solvent were mechanically stirred for 2 hours, and then vacuum defoamed to prepare polyurethane casting solution. Wherein, the stirring temperature is 30° C., and the stirring rate is 800 r / min.
[0056] The mass fraction ratio is 99%: 1% deionized water and ethanol are compounded, stirred evenly and then prepared into a coagulation bath. Wherein, the conductivity of the deionized water is 16MΩ·cm, and the temperature of the coagulation bath solution is 20°C.
[0057] Scrape-coat the prepared polyurethane casting solution on the polytetrafluoroethylene mold, immediately immerse in the coagulation bath for 4 hours after heat treatment for 60 seconds, take it out, and then place it in a 30°C drying oven for solvent evaporation treatment for 48 hours, a...
Embodiment 2 Embodiment 8
[0063] The difference between embodiment two to embodiment eight and embodiment one is only: in the ternary mixed solvent, the mass fraction ratio of toluene, N,N-dimethylformamide and dioxane is different, and other steps are the same as in embodiment one are basically the same, and are not repeated here; the mass fractions of toluene, N, N-dimethylformamide and dioxane in embodiment two to embodiment eight are as shown in the following table:
[0064]
[0065] The process of preparing polyurethane film by traditional immersion precipitation method is: the preparation of casting solution; dissolving polyurethane in N, N-dimethylformamide, stirring uniformly after mechanical stirring, vacuum defoaming and preparing polyurethane casting solution; The casting solution is scraped and coated on the mold, and then the mold containing the casting solution is immersed in a water coagulation bath for about 2 hours, and then the mold is taken out and dried to obtain a polyurethane fi...
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