Preparation method of modified hydrophilic long-acting durable anti-fog coating based on silane coupling agents
A silane-based coupling agent and silane coupling agent technology are applied in the field of preparation of anti-fog coatings, which can solve the problems of non-persistent anti-fog, poor coating durability, poor mechanical strength, etc., and achieve long-lasting scratch resistance. The effect of rubbing performance, improving hardness and hydrophilicity, and durable anti-fog performance
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Embodiment 1
[0027] The preparation method of anti-fog coating, the steps are as follows:
[0028] (1) Take 70 mg of polyvinyl alcohol with a number average molecular weight of 3000 and a degree of alcoholysis of 87.0% to 89.0%, and dissolve it in 20 mL of dimethyl sulfoxide under heating at 90°C. Add 8 µL of triethylamine and 5 µL of isocyanatopropyltriethoxysilane. Heated in a water bath at 30°C and reacted for 15 hours under the condition of magnetic stirring.
[0029] (2) Add the mixed solution obtained from step (1) dropwise into 400 mL of tetrahydrofuran with constant pressure dropping funnel under stirring. Centrifuge and collect the lower precipitate, wash and dry to obtain the modified product.
[0030] (3) In terms of mass fraction, weigh 40 parts of deionized water, 1 part of modified product, and 5 parts of surfactant (sorbitol monopalmitate), and mix evenly under magnetic stirring to prepare hydrophilic long-acting and durable Anti-fog coatings based on silane coupling agen...
Embodiment 2
[0032] The preparation method of anti-fog coating, the steps are as follows:
[0033] (1) Take 200 mg of polyvinyl alcohol with a number-average molecular weight of 67,000 and a degree of alcoholysis of 87.0% to 89.0%, and dissolve it in 20 mL of dimethyl sulfoxide under heating at 90°C. Add 10 µL of dibutyltin diacetate and 50 µL of 3-isocyanatopropyltrimethoxysilane. Heated in a water bath at 40°C and reacted for 2h under the condition of magnetic stirring.
[0034] (2) Add the mixed solution obtained from step (1) dropwise into 1000 mL of tetrahydrofuran with constant pressure dropping funnel under the condition of stirring. Centrifuge and collect the lower precipitate, wash and dry to obtain the modified product.
[0035] (3) In terms of mass fraction, weigh 200 parts of deionized water, 1 part of modified product, and 8 parts of surfactants (cocoic acid diethanolamide, lauric acid), and mix them evenly under magnetic stirring to prepare hydrophilic Long lasting anti-fo...
Embodiment 3
[0037] The preparation method of anti-fog coating, the steps are as follows:
[0038] (1) Take 500 mg of polyvinyl alcohol with a number average molecular weight of 100,000 and a degree of alcoholysis of 87.0% to 89.0%, and dissolve it in 20 mL of dimethylsulfoxide under heating at 90°C. Add 15 µL of dibutyltin dichloride and 250 µL of propyltriethoxysilane isocyanate. Heated in a water bath at 80°C and reacted for 1 h under the condition of magnetic stirring.
[0039] (2) Add the mixed solution obtained from step (1) dropwise into 600 mL of tetrahydrofuran with stirring using a constant pressure dropping funnel. Centrifuge and collect the lower precipitate, wash and dry to obtain the modified product.
[0040] (3) In terms of mass fraction, weigh 300 parts of deionized water, 1 part of modified product, and 10 parts of surfactant (lauric acid), and mix evenly under magnetic stirring to prepare hydrophilic long-acting and durable based on silane coupling agent anti-fog coat...
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