Using 1,4-butanediol and adipic acid in accordance with the 110:100 molar ratio after polycondensation reaction to produce the number average molecular weight of 1000, hydroxyl value of 110mgKOH/g, functionality of 2.0 polyester polyol B, based on the amount of the formula of polyether ester polyol, polyester polyol B at room temperature into the reaction kettle, stirring and heating to 100 C, dehydration and degassing under vacuum conditions for 2h, and then reduce the temperature to 50 C. Add 10ppm benzoyl chloride and the proportion of pure MDI formula reaction at 80 C for 2h, that is, the product. to 50 , add 10 ppm benzoyl chloride and the formula proportion of pure MDI, and react at 80 for 2h, it is obtained.
Acetone, DMF, DMSO, DMAC, MEK, methylene chloride, toluene
