A kind of synthetic method of polyurethane for water-based three anti-paint
A synthesis method and conformal paint technology, applied in polyurea/polyurethane coatings, coatings, etc., can solve the problems of poor salt spray resistance and low hardness, achieve good salt spray resistance, good stability, and avoid expansion The effect of a chain reaction
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Embodiment example 1
[0030] In the first step, add 480g of polyester polyol (molecular weight: 3000) into a four-necked bottle and vacuum dehydrate at 100-110°C for 0.5h, then add 1.5g of DMPA hydrophilic chain extender at 85°C, and stir for 10min Add 71g IPDI and 9 drops of catalyst dibutyltin dilaurate (DBTDL), and control the temperature at 70-80°C for 2.3h;
[0031] In the second step, add 7g of 1,4-BDO to the system of step 1) at 65°C and react at about 65°C for 3 hours, then add 400g of acetone to reduce the viscosity, and then add 0.98g of triethylamine and 12.6g of Sulfonate hydrophilic chain extender AAS, react for 60 minutes until the viscosity is stable, and keep the temperature at 60-65°C.
[0032] The third step is to pour the prepolymer obtained in the second step into the dispersing bucket and bring it to room temperature, add 550g of water while stirring at high speed to form a self-emulsifying system, then add 2.3g of ethylenediamine to extend the chain for 15min, and finally evap...
Embodiment example 2
[0034] In the first step, add 480g of polyester polyol (molecular weight: 3000) into a four-neck bottle and vacuum dehydrate at 100-110°C for 0.5h, then add 1.5g of DMPA hydrophilic chain extender at 85°C, and stir for 10min Add 48g HDI and 8 drops of catalyst dibutyltin dilaurate (DBTDL), and control the temperature at 75°C for 2.5h,
[0035] In the second step, add 7.2g of 1,4-BDO to the system of the first step at 65°C and react for 3 hours at about 65°C, then add 400g of acetone to reduce the viscosity, and then add 0.98g of triethylamine and 12.6 g sulfonate hydrophilic chain extender AAS, react for 60 minutes until the viscosity is stable, and keep the temperature at 60-65°C.
[0036] In the third step, pour the prepolymer obtained in the second step into the dispersion bucket and bring it to room temperature, add 600g of water while stirring at high speed to form a self-emulsifying system, then add 2.5g of ethylenediamine to extend the chain for 15min, and finally evapo...
Embodiment example 3
[0038] In the first step, add 480g of polyester polyol (molecular weight: 3000) into a four-neck bottle and vacuum dehydrate at 100-110°C for 0.5h, then add 1.5g of DMPA hydrophilic chain extender at 85°C, and stir for 10min Add 35g HDI and 12gIPDI and 10 drops of catalyst dibutyltin dilaurate (DBTDL), and control the temperature at 70-80°C for 2.3h;
[0039] In the second step, add 7g of 1,4-BDO to the system of step 1) at 65°C and react at about 65°C for 3 hours, then add 400g of acetone to reduce the viscosity, and then add 0.98g of triethylamine and 12.6g of Sulfonate hydrophilic chain extender AAS, react for 60 minutes until the viscosity is stable, and keep the temperature at 60-65°C.
[0040] In the third step, pour the prepolymer obtained in the second step into the dispersing bucket until it reaches room temperature, add 550 g of water while stirring at high speed to form a self-emulsifying system, then add 2.3 g of ethylenediamine to extend the chain for 15 minutes, an...
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