Synthesis process of organosilicon-modified single-component aqueous polyurethane coating agent
A water-based polyurethane and synthetic process technology, applied in the direction of coating, can solve the problems of waterproof, anti-fouling and poor wear resistance, and achieve the effects of low production cost, improved water resistance, and improved wear resistance.
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Embodiment 1
[0018] (1) Add 10 parts of polyester diol, 10 parts of polyether triol, 10 parts of toluene diisocyanate and 0.2 part of catalyst in a dry reactor equipped with a stirrer, thermometer and reflux condenser, and then heat up to 50 responses. The catalyst is triethylenediamine.
[0019] (2) When the isocyanate group content reaches the theoretical value, add 3 parts of chain extender (1,4-butanediol) and 2 parts of organosilicone oil octamethylcyclotetrasiloxane, and keep the above temperature to continue the reaction and extend the chain and modified to obtain a prepolymer.
[0020] (3) When the above-mentioned isocyanate group content reaches the theoretical value, add 0.5 parts of dihydroxypropionic acid and 1 part of crosslinking agent SAC-100 for crosslinking reaction, react for a period of time, cool down to 40°C, add 0.3 parts of organic amine and 100 parts of distilled water, continue to stir and react for neutralization and emulsification, so as to obtain the finished ...
Embodiment 2
[0022] (1) Add 40 parts of polyester diol, 30 parts of polyether triol, 30 parts of toluene diisocyanate and 1.2 parts of catalyst in a dry reactor equipped with a stirrer, thermometer and reflux condenser, and then heat up to Reaction at 80°C. The catalyst is acetate.
[0023] (2) When the isocyanate group content reaches the theoretical value, add 15 parts of chain extender (1,4-butanediol) and 10 parts of silicone oil octamethylcyclotetrasiloxane, and keep the above temperature to continue the reaction and extend the chain and modified to obtain a prepolymer.
[0024] (3) When the above-mentioned isocyanate group content reaches the theoretical value, add 6 parts of dihydroxypropionic acid and 5 parts of cross-linking agent SAC-100 for cross-linking reaction, react for a period of time, cool down to 40°C, add 5 parts of organic amine and 100 parts of distilled water, continue to stir and react for neutralization and emulsification, so as to obtain the finished product of ...
Embodiment 3
[0026] (1) Add 25 parts of polyester diol, 20 parts of polyether triol, 20 parts of toluene diisocyanate and 0.8 part of catalyst in a dry reactor equipped with a stirrer, thermometer and reflux condenser, and then heat up to Reaction at 50~80℃. The catalyst is stannous octoate.
[0027] (2) When the isocyanate group content reaches the theoretical value, add 9 parts of chain extender (1,4-butanediol) and 6 parts of organosilicone oil octamethylcyclotetrasiloxane, and keep the above temperature to continue the reaction and extend the chain and modified to obtain a prepolymer.
[0028] (3) When the above-mentioned isocyanate group content reaches the theoretical value, add 3.2 parts of dihydroxypropionic acid and 3 parts of crosslinking agent SAC-100 for crosslinking reaction, react for a period of time, cool down to 40°C, add 2.8 parts of organic amine and 100 parts of distilled water, continue to stir and react for neutralization and emulsification, so as to obtain the fini...
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