A kind of preparation method of organosilicon modified cationic waterborne polyurethane antibacterial emulsion
A water-based polyurethane and silicone technology, applied in coatings and other directions, can solve the problems of easy generation of drug resistance, poor yellowing resistance, poor antibacterial properties, etc., and achieve the effects of high comprehensive use performance, increased weather resistance, and improved water resistance.
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Embodiment 1
[0030] Add a certain amount of polyethylene glycol 1000 and sandan oil into a three-necked flask according to the material ratio of 2:1, raise the temperature to 100°C, remove the water in the system by vacuuming, and cool down for later use.
[0031] Add 222g of IPDI into an empty three-neck flask, start stirring, raise the temperature to 70°C, add 370g of the dried mixture of polyethylene glycol 1000 and sandan oil, after 30min dropwise, continue the reaction, add 100ml of butane to the system Ketones were reacted at 70°C for 2.5 hours to generate prepolymers with -NCO terminal groups; the value of -NCO was measured to meet the requirements.
[0032] According to the mass ratio of unreacted NCO to N-methyldiethanolamine in the reaction system is 4:1, add N-methyldiethanolamine dropwise, and continue the chain extension reaction at 70°C for 2 hours to obtain cationic end-NCO polyurethane; detection The value of NCO; after reaching the requirement, add dropwise 30min glacial a...
Embodiment 2
[0034] Add 750g polyethylene glycol 2000 and 27g sandan oil into the three-necked bottle, raise the temperature to 100°C, remove the water in the system by vacuuming, cool down to 80°C, start stirring, add 222g IPDI to the three-necked bottle, and then slowly cool down to 70°C, during the reaction, according to the viscosity change, add 80-120ml butanone to the system, react for 2.5h, measure the value of -NCO until the requirement is met, stop the reaction.
[0035] According to the mass ratio of unreacted NCO to N-methyldiethanolamine in the reaction system is 4:1, add N-methyldiethanolamine dropwise, continue the chain extension reaction at 70°C for 2 hours, and obtain cationic end-NCO polyurethane; detection The value of NCO; according to the mass ratio of N-methyldiethanolamine and glacial acetic acid, glacial acetic acid was added dropwise for 30min at a ratio of 1:1, stirred rapidly at a stirring speed of 800r / min, and reacted for 1h to vacuumize butanone to obtain Cati...
Embodiment 3
[0037] Add 375g of polyethylene glycol 1000 and 27g of sandan oil into the three-necked bottle, raise the temperature to 100°C, remove the water in the system by vacuuming, cool down to 80°C, start stirring, and add 168g of 1,6-hexamethylene diisocyanate into the three-necked bottle , and then slowly lower the temperature to 70°C. During the reaction, according to the viscosity change, add 60-100ml butanone to the system, react at 70°C for 2.5h, measure the value of -NCO until the requirement is met, stop the reaction,
[0038] According to the mass ratio of unreacted NCO and N-methyldiethanolamine in the reaction system of 4:1, add N-methyldiethanolamine dropwise, continue the chain extension reaction at 70°C, and react for 2 hours to obtain cationic terminal-NCO Polyurethane; detect the value of NCO, according to the ratio of N-methyldiethanolamine and glacial acetic acid mass ratio of 1:0.9, add dropwise glacial acetic acid for 30min, stirring speed 1000r / min, vacuumize buta...
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