| abstract |
The invention relates to the technical field of polyurethane coatings, in particular to a method for preparing an exposed polyurethane waterproof coating, comprising the following steps: S1: mixing epoxy resin and diethanolamine uniformly, heating up under nitrogen protection, stirring and reacting, and preparing Mixed component A; S2: Mixed component A and polyether diol are stirred evenly, then dropwise add organotin catalyst to hexamethylene diisocyanate trimer and stir to heat up, mix mixed component A and polyether The mixture of dihydric alcohols was added dropwise to the hexamethylene diisocyanate trimer, and the reaction was continued for 90 min after the mixed solution was completely dropped to obtain the mixed component B; S3: the temperature of the mixed component B was lowered to below 40°C, A latent curing agent, a defoamer, a film-forming accelerator and a solvent are added, mixed uniformly, and filled with nitrogen for protection; the exposed polyurethane waterproof coating prepared by the invention can effectively prevent bubbles, pinholes and other phenomena in the coating film, and make the coating film Water resistance, hardness and other properties have been further improved. |