silicone modified polyurethane waterproofing paint and manufacturing method thereof

摘要

A polyurethane waterproofing paint is provided to ensure excellent scratch resistance and impact resistance and to strengthen anti-fouling property and weather resistance against xenon lamp irradiation. A method for manufacturing a silicone modified polyurethane prepolymer for a silicone modified polyurethane waterproofing paint comprises (a) a step for mixing polyisocyanate (NCO-P-NCO), polyol (HO-P-OH) and polydimethylsiloxane (HO-PDMS-OH) so that the molar ratio (NCO/OH) of isocyanate radical (NCO) and -OH (OH) becomes 2.0-8.0 while adding 5-10 % polydimethylsiloxane (HO-PDMS-OH) based on polyisocyanate (NCO-P-NCO) equivalent; and (b) a step for strring polyisocyanate (NCO-P-NCO), polyol (HO-P-OH) and polydimethylsiloxane (HO-PDMS-OH) in a reactor, at 60-90°C for 3~5 hours.