咪唑封闭水性聚氨酯复鞣剂的制备及表征  

Preparation and characterization of imidazole blocked waterborne polyurethane retanning agent

作　　者：李刚辉[1] 李新[1] 银召霞[1] 沈一丁[1] 李培枝[1] 赖小娟[1] 

机构地区：[1]陕西科技大学教育部轻化工助剂化学与技术重点实验室,陕西西安710021

出　　处：《功能材料》2011年第7期1215-1218,共4页Journal of Functional Materials

基　　金：陕西省自然科学基金资助项目(2009JQ6003);陕西省自然科学专项基金资助项目(2010JK436);西北师范大学开放基金资助项目(KF-09-1)

摘　　要：通过分子设计,以咪唑为封闭剂,1,6-己二异氰酸酯(HDI)、二羟甲基丙酸(DMPA)、2,2-二(4-羟基苯基)丙烷、聚酯二醇为原料制备出咪唑封闭水性聚氨酯复鞣剂(BPU)。用FT-IR、动态激光光散射(DLS)、TEM、TGA、DSC分别对BPU分子结构、乳胶粒形态及热性能进行了表征,分析了BPU复鞣剂的分子作用基础。结果表明产物分子结构中出现了羧基、咪唑环和聚氨酯结构;乳胶粒呈较为规则的、具有核壳结构的球形,粒径的多分散性是BPU具有良好选择填充性的微观原因。TGA和DSC分析显示BPU耐热性较高并随封闭率增加而略有降低;BPU解封温度范围为107.5～124.5℃,峰值为115.1℃;应用过程中BPU解封程度极低,利于助染性能的提高。Imidazole-blocked waterborne polyurethane retanning agent（BPU） was prepared by the reaction of 1,6-hexanediamine（HDI）,dimethylol propionic acid（DMPA）,2,2-bis（4-hydroxyphenyl）propane（BPA）,polyesterglycol and imidazole as blocking agent through molecular design method.FT-IR,dynamic laser light scattering（DLS）,TEM,TGA,DSC characterized the structure of BPU,the particle size distribution and morphology of the resultant dispersions and thermal properties of BPU,respectively.At the same time,molecular basis of action mechanism of BPU were analyzed.The results show that structures of carboxyl,imidazole ring and polyurethane are found in BPU molecular structure.The morphology of the particle is comparatively regular sphericity with core/shell structure and the poly-dispersity of particle sizes is the microcosmic reason of BPU with favorable selective filling.Indicated by TGA,the heat-resistant properties of BPU is properly high and decrease appreciably with increase of the blocked ratio of BPU.According to the result of DSC analysis,deblocking temperature of BPU ranges from 107.5 to 124.5℃ and its peak value is 115.1 ℃.During the application,the deblocking of BPU rarely occurs and it is advantageous for the increasing of auxiliary dyeing.

关 键 词：水性聚氨酯 咪唑 封闭异氰酸酯 复鞣剂 表征 

分 类 号：TS529.2[轻工技术与工程—皮革化学与工程]