| 摘要 |
According to a disclosed method for manufacturing aqueous polyurethane, a polyol mixture including first polyester polyol obtained by reacting 1,4-butanediol with adipic acid is obtained and polyurethane prepolymer is obtained by reacting ionic carboxylic acid with diisocyanate. Polyurethane resin is obtained by neutralizing the polyurethane prepolymer. Aqueous polyurethane resin is obtained by adding water to the polyurethane resin and mixing the water and the polyurethane resin. The molar fraction of the first polyester polyol against the polyol mixture is 0.15 to 0.6. [Reference numerals] (S10) Obtain polyurethane prepolymer;(S20) Obtain polyurethane resin by neutralizing the polyurethane prepolymer;(S30) Produce aqueous polyurethane resin by adding water to the polyurethane resin and mixing the water and the polyurethane resin |
