Method for preparing polyurethane-nano silver long-lasting antimicrobial film by modification method after ultraviolet-irradiation
A polyurethane and nano-silver technology, applied in the field of antibacterial materials, can solve the problems of difficult polymer synthesis, unsuitable surface modification, deterioration, etc., achieve good antibacterial long-term effect, avoid difficult synthesis, and simplify the effect of the reaction process
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Embodiment 1-3
[0047] A method for preparing polyurethane-nanometer silver long-acting antibacterial film by modification method after ultraviolet light irradiation, comprising steps as follows:
[0048] (1) Preparation of polyurethane-nanometer silver film
[0049] Add 4,4'-dicyclohexylmethane diisocyanate (7.5g) and polytetrahydrofuran (7.9g) into a 100mL three-necked flask, and use a digital display electric stirrer to stir at a constant temperature of 90°C for 2 hours for prepolymerization. After completion, the temperature was lowered to 70°C; trimethylolpropane (0.178g), 1,6-hexanediol (2.21g) were dissolved in acetone (15mL) and poured into a three-necked flask, and then dimethylol was added Propionic acid (0.180g), 3 drops of dibutyltin dilaurate, and the temperature was raised to 80°C to continue the reaction for 3h. Then, the silver nitrate solids of 1% (Example 1), 5% (Example 2), and 10% (Example 3) were dissolved in dimethylformamide (5mL) by mass percent, and then divided with...
Embodiment 4
[0064] As described in Example 1, the difference is:
[0065] In step (1), the prepolymerization reaction temperature is 100°C, and the reaction temperature after adding dimethylolpropionic acid and dibutyltin dilaurate is 70°C;
[0066] The intensity of ultraviolet light is 1500mW / cm in the step (3) 2 .
Embodiment 5
[0068] As described in Example 1, the difference is:
[0069] In step (1), the mass ratio of diisocyanate, polytetrahydrofuran, crosslinking agent, chain extender, dimethylolpropionic acid and catalyst is 1:1.1:0.024:0.28:0.02:0.003.
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