新型聚天门冬氨酸酯防护材料的制备及其耐老化研究

Study on the preparation and aging resistance of novel polyaspartic acid ester protection material

研究了不同结构的聚天门冬氨酸酯、多元醇以及异氰酸酯对聚天门冬氨酸酯(PAE)防护材料结构与性能的影响,重点考察了对其力学性能及耐老化性能的影响。结果表明:不同结构的聚天门冬氨酸酯可影响涂层的干燥时间;聚酯多元醇用量及异氰酸酯种类可影响涂层的耐紫外线老化性能。其中,聚酯多元醇的用量从占多元醇总量的6.7%增加到33.3%时,PAE防护材料的拉伸强度逐渐增大,并达到最大值13.5 MPa,耐紫外老化性能逐渐提升;通过比较发现,以HDI三聚体等聚异氰酸酯合成固化剂所制备的涂层体系,耐老化性能优于以IPDI等脂肪族二异氰酸酯合成固化剂所制备的涂层体系。

The impacts of polyaspartic acid ester, polyol and isocyanate on the structure and properties of polyaspartic polyurea coatings were investigated,especlally the effects of mechanical properties and aging resistance were studied. The results reveal that polyaspartic acid ester with different structure has obviously effects on drying time of the coatings,and polyester polyol and isocyanate has effects on the UV aging resistance of the coatings. So when the addition amount of polyester polyol changes from 6.7% to 33.3%,the tensile strength and the ability of aging-resistance of PAE polyurea coatings increased gradually,and the tensile strength reached the maximum at 13.5 MPa. The comparison results showed that coating system prepared by HDI tripotymer polyisocyanate have a better property in ageing resistance than by IPDI aliphatie series diisocyanate.