Preparation method of TDI tripolymer bright light curing agent with low free monomer content
A technology of monomer content and trimer, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve the problems of easy production of high polymers, non-discharge, long time, etc., and achieve good scratch resistance and scratch resistance The effect of good wound and wide compatibility
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Embodiment 1
[0020] In the synthesis kettle, 18 parts of 210 polyether, 40 parts of lauryl alcohol, and 448 parts of butyl acetate were added sequentially according to the weight ratio of the formula. When no water drops appear, cool down and cool down; when the temperature drops below 40°C, add 465 parts of 2,4-toluene diisocyanate, pass N2 protection, heat up to 75-80°C, keep warm for 0.5-1h, then cool down to 55°C, Add 1.6 parts of catalyst A compounded by DMP-30, potassium isooctanoate, and butyl acetate, and control the temperature at 55-65°C for 4 hours, then start to detect NCO, and then measure the NCO value every 0.5 hours; when the detected NCO At 10±0.5%, add 22 parts of n-butanol and 0.4 parts of potassium isooctanoate catalyst, and control the temperature at 55-60°C; when the detected NCO is 7.5±0.3%, stop feeding N2 and add benzoyl chloride 2.0 parts, 3.0 parts of antioxidant BHEB and adding butyl acetate to dilute to 50±2% solid content, stir for 0.5h, cool down to 40°C, fil...
Embodiment 2
[0022]In the synthesis kettle, 15 parts of 220 polyether, 42 parts of lauryl alcohol, and 435 parts of butyl acetate were sequentially added according to the weight ratio of the formula. When no water drops appear, cool down and cool down; when the temperature drops below 40°C, add 476 parts of 2,4-toluene diisocyanate, pass through N2 protection, heat up to 75-80°C, keep warm for 0.5-1h, then cool down to 55°C, Add 1.8 parts of catalyst A compounded by DMP-30, zinc naphthenate, and butyl acetate, control the temperature at 55-65°C and react for 4 hours, then start to detect NCO, and then measure the NCO value every 0.5 hours; When the NCO is 10±0.5%, add 24 parts of n-butanol and 0.6 parts of zinc naphthenate catalyst, and control the temperature at 55-60°C. When the detected NCO is 7.5±0.3%, stop feeding N2 and add 2.4 parts of phosphoric acid. 3.2 parts, antioxidant BHT and butyl acetate to dilute to 50±2% solid content, stir for 0.5h, cool down to 40°C, filter and pack.
Embodiment 3
[0024] In the synthesis kettle, according to the formula weight ratio, add 15 parts of 210 polyether, 36 parts of cetyl alcohol, and 434 parts of butyl acetate in sequence. When the temperature rises to about 108 ° C, there will be reflux, and reflux for 2 to 3 hours for dehydration. If there are no drops of water in the container, cool down; when the temperature drops below 40°C, add 482 parts of 2,4-toluene diisocyanate, pass through N2 protection, heat up to 75-80°C, keep warm for 0.5-1h, then cool down to 55°C ℃, add 1.8 parts of catalyst A compounded by PC-41, zinc isooctanoate, and butyl acetate, control the temperature at 55-65°C and react for 4 hours, then start to detect NCO, and then measure the NCO value every 0.5h; When the NCO is 10±0.5%, add 25 parts of n-butanol and 0.6 parts of zinc isooctanoate catalyst, and control the temperature at 55-60°C; when the detected NCO is 7.5±0.3%, stop feeding N and add hypophosphorous acid 2.6 parts, 10103.0 parts of antioxidant...
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