Method for preparing compositey sealed polyisocyanates coating
A polyisocyanate and diisocyanate technology, which is applied in the field of preparation of blocked isocyanate curing agents, can solve the problems of poor storage stability and thermal stability of unsealed products, limited application scope, poor product stability, etc., achieves good mechanical properties, overcomes edge Casting, the effect of excellent performance
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[0023] Example 1:
[0024] Add 1000 g of polyether polyol to the three-necked flask, dehydrate it for 2 hours at 110-120 ° C and the vacuum degree is 0.09 MPa, and cool down to 60 ° C after the moisture test is qualified; add the dehydrated polyether polyol dropwise to a volume containing 2500 g of polyether polyol. In the reaction kettle for liquefying 4,4-diphenylmethane diisocyanate, the temperature is slowly raised to 70-75°C, and the reaction is kept for 2 hours; the content of cyanate groups (NCO value) of the detector reaches the theoretical value.
[0025] Add 2200g propylene glycol methyl ether acetate solvent to the reaction kettle of 4,4-diphenylmethane diisocyanate-polyether polyol prepolymer, stir evenly, heat up to 60°C, add 400g diethyl malonate dropwise, The reaction was carried out under low-speed stirring at 65-75 °C for about 2 hours; then 400 g of ethyl acetoacetate was added dropwise, and the reaction was carried out at 65-75 °C with low-speed stirring for...
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