A kind of preparation method of anionic waterborne polyurethane nano-silver composite coating
A water-based polyurethane and composite coating technology, which can be used in antifouling/underwater coatings, paints containing biocides, etc., and can solve problems such as wide particle size distribution of nano-silver
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Embodiment 1
[0021] Vacuum dehydrate 100 parts of sulfonated water-soluble polyester polyol BY3301 and 33.3 parts of aliphatic isocyanate IPDI, stir evenly, heat up to 90°C for 2 hours, add 100 parts of acetone to cool down, then add 7.2 parts of diethyl ethylene glycol (DEG) , 2 drops of catalyst stannous octoate (T-9), 2 drops of dibutyltin dilaurate (T-12), maintain the temperature at 80°C for 4 hours, add 6.9 parts of sodium sulfamate (A95) after cooling down, and maintain the reaction at 40°C After half an hour, cool and discharge the material, use a high-speed mixer to add ice water to emulsify, and finally remove acetone. The solid content of sulfonate-type water-based polyurethane is 48-52%.
[0022] Take 10ml of sulfonate aqueous polyurethane emulsion, add 20ml of deionized water, add 5ml of silver nitrate solution (concentration 3mg / ml) and stir well. Add sodium borohydride NaBH while stirring 4 , wherein the molar ratio of silver nitrate to sodium borohydride is 1:3, the color ...
Embodiment 2
[0024] 100 parts of sulfonated water-soluble polyester polyol BY3301 and 33.3 parts of aliphatic isocyanate IPDI are vacuum dehydrated, stirred evenly, heated to 90°C for 2 hours, added 80 parts of acetone to cool down, then added 7.2 parts of diethyl ethylene glycol (DEG) , 2 drops of catalyst stannous octoate (T-9), 2 drops of dibutyltin dilaurate (T-12), maintain the temperature at 80°C for 4 hours, add 6.9 parts of sodium sulfamate (A95) after cooling down, and maintain the reaction at 40°C After half an hour, cool and discharge the material, use a high-speed mixer to add ice water to emulsify, and finally remove acetone. The solid content of sulfonate-type water-based polyurethane is 48-52%.
[0025] Take 10ml of sulfonate aqueous polyurethane emulsion, add 10ml of deionized water, add 5ml of silver nitrate solution (concentration 3mg / ml) and stir well. Add sodium borohydride NaBH while stirring 4 , wherein the molar ratio of silver nitrate to sodium borohydride is 1:3, ...
Embodiment 3
[0027] Vacuum dehydrate 100 parts of sulfonated water-soluble polyester polyol BY3301 and 33.3 parts of aliphatic isocyanate IPDI, stir evenly, heat up to 90°C for 2 hours, add 100 parts of acetone to cool down, then add 7.2 parts of diethyl ethylene glycol (DEG) , 2 drops of catalyst stannous octoate (T-9), 2 drops of dibutyltin dilaurate (T-12), maintain the temperature at 80°C for 4 hours, add 6.9 parts of sodium sulfamate (A95) after cooling down, and maintain the reaction at 40°C After half an hour, cool and discharge the material, use a high-speed mixer to add ice water to emulsify, and finally remove acetone. The solid content of sulfonate-type water-based polyurethane is 48-52%.
[0028] Take 10ml of sulfonate aqueous polyurethane emulsion, add 5ml of deionized water, add 5ml of silver nitrate solution (concentration 3mg / ml) and stir well. Add sodium borohydride NaBH while stirring 4 , wherein the molar ratio of silver nitrate to sodium borohydride is 1:3, the color o...
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