水性双组分聚氨酯柔感涂料的制备及性能

Preparation and Properties of Two-Component Waterborne Polyurethane Soft Feel Coatings

以自制聚酯多元醇、二异氰酸酯为原料分别合成含羟基端水性聚氨酯及水性聚氨酯,并以亲水性脂肪族聚异氰酸酯为固化剂,添加适量助剂配制水性双组分聚氨酯柔感涂料.考察了聚酯多元醇的相对分子质量、二羟基丙酸(DMPA)的用量、-OH/-NCO比例等与涂料的稳定性、铅笔硬度、附着力、柔韧性、耐水性、耐溶剂性、耐化学品性、耐刮伤性以及耐化妆品性之间的关系.研究结果发现:合成水性聚氨酯分散体所用的聚酯多元醇的相对分子质量为2 000,DMPA质量分数为6%,合成羟基端水性聚氨酯分散体中-OH/-NCO=1.6,固化过程中-NCO/-OH=1.5～1.6时,涂料的综合性能最好.

Two-component waterborne polyurethane soft feel coatings were prepared and their properties were investigated. The soft feel coatings were fabricated by hydroxyl-containing polyurethane, polyurethane dispersions and water-emulsifiable polyisocyanate. The dispersions were achieved by synthesized polyester polyol and isocyanate. The influence of molecular weight of polyester polyol, content of DMPA, molar ratio of OH/ NCO on performance of the coating such as stability, pencil hardness, adhesion, flexibility, water resistance, solvent resistance, chemical resistance, resistance to scratches and cosmetics was investigated. It is found that a kind of high-performance film could be prepared in condition as follows. The molecular weight of polyester polyols is 2000, --OH/--NCO = 1.6 and DMPA = 6% during synthesis polyurethane dispersions, while NCO/ OH= 1.5 in the process of curing.