针对传统聚氨酯色浆中色基与聚氨酯结合力弱(分子间力),导致成品革色牢度差、色迁移严重等技术难题,本文设计合成了一种反应型彩色二元醇:在四氢呋喃介质中,控制n(对苯二胺)∶n(乙酸酐)=1.00∶0.95, 0~5 ℃下,用乙酸酐将对苯二胺单酰化反应15 h,得到对氨基乙酰苯胺(产率85%),经重氮化,与过量摩尔分数为5% N-苯基二乙醇胺偶合制得了一种含两个端羟甲基的偶氮化合物4-乙酰基胺基-4'-N,N-二羟乙氨基偶氮苯(产率82%);将其与聚酯二元醇?聚醚二元醇以不同比例混合,与双异氰酸酯预聚?扩链后形成红色聚氨酯树脂色浆,在离型纸上铺展成膜,其断裂增长率443畅0%,断裂相对强度125畅5 g,色迁移量21畅4 μg,进口同类产品形成膜后的断裂增长率?断裂相对强度与色迁移量分别为442畅2%?125畅3 g 和29畅2 μg.合成产品优于同类进口产品?
In order to solve poor color fastness and serious color transfer of the traditional color polyurethane leather because of weak interaction(intermolecular force) between polyurethane and color base.A kind of reactive color diol was synthesized as follows:p-aminoacetanilide with a yield of 85% was prepared by acylation of p-phenylenediamine with acetic anhydride in tetrahydrofuran at 0~5 ℃ for 15 h, during which the molar ratio of p-phenylenediamine to acetic anhydride was 1.00∶0.95. Then its diazonium salt was coupled with an excess molar fraction of 5% N-phenyl-diethanolamine to obtain 4-acetylamino-4′-N,N-dihydroxyethylamino azobenzene with yield of 82%. The reactive color diol was mixed with polyester or polyether diol in different proportions, followed by prepolymering, chain extension with diisocyanate to form polyurethane resin color paste whose crack-growth rate, relative breaking strength, and color transfer are 443%, 125.5 g and 21.4 μg, respectively, when spreaded into a film. And those of the similar film obtained from import diol are 442.2%, 125.3 g and 29.2 μg, respectively, indicating that the synthetic color diol is superior to the imported product.
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