Preparation method of protective paint coated film
A coating and coating technology, applied in anti-corrosion coatings, coatings, etc., can solve the problems of poor peelability, single protective performance, low coating film strength, etc., to reduce coating film shrinkage, improve appearance, and improve mechanical strength. Effect
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[0028] Example 1
[0029] The preparation method of protective coating film includes the following steps:
[0030] 1) Add isophorone diisocyanate, polypropylene glycol, polyethylene glycol, dibutyltin dilaurate and methyl ethyl ketone to the first reactor at room temperature, and then raise the temperature to 58~80℃ to make them in the first reactor. A reaction kettle is mixed and reacted until the -NCO% value in the system no longer changes, and the primary product is obtained for use;
[0031] 2) Control the temperature at 80℃, add dimethylolpropionic acid to the primary product obtained in step 1) and react for 220~260min, then lower the temperature to 38~43℃, add triethylamine to obtain the secondary product ; Add the secondary product to the second reactor filled with distilled water and disperse the secondary product in the distilled water, and then add the diethylenetriamine aqueous solution to prepare an aliphatic waterborne polyurethane emulsion for use;
[0032] 3) Add prop...
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