封闭型水性聚氨酯的制备及其高温固化性能的研究  

Study on Preparation of Blocked Waterborne Polyurethane and Its Properties Cured at High Temperature

作　　者：王福芳[1] 魏燕彦[1] 宗成中[1] 

机构地区：[1]橡塑材料教育部重点实验室,青岛科技大学,山东青岛266042

出　　处：《涂料工业》2010年第10期44-46,共3页Paint & Coatings Industry

基　　金：山东省高校科技发展计划项目(J09LB05);山东省中青年科学家科研奖励基金(BS2009CL020)资助

摘　　要：选用甲苯二异氰酸酯(TDI)、端羟基聚丁二烯(HTPB)、二羟甲基丙酸(DMPA)、封闭剂等合成水性封闭型聚氨酯预聚物,用作橡胶表面的涂层。通过傅里叶变换红外光谱(FT-IR)对封闭过程进行了跟踪监测,并对苯酚和甲乙酮肟(MEKO)的封闭效果进行了比较;对不同交联剂含量下的涂膜性能和机械性能进行了测定。研究发现:甲乙酮肟具有较短的封闭时间和较低的解封温度,而涂膜的硬度和拉伸强度随交联剂用量的增加而提高,充分的交联剂用量可以得到拉伸强度18.9 MPa,断裂延长率324%的涂膜,可以满足橡胶涂料的性能要求。Toluence diisocyanate（TDI）, hydroxyl - terminated polybutadiene （ HTPB）, dimethylol propionic acid（DMPA） and blocking agents were used to synthesize blocked waterborne polyurethane as rubber coatings. The bocking reaction was traced by FT-IR with attenuated total reflectance （F-FIR -ATR）. The blocking effects of phenol and methyl ethyl ketoxime （MEKO） was compared. The coating properties with different amount of crosslinker were measured. It was found that MEKO had a shorter blocking time and a lower unblocking temperature. The hardness and tensile strength of coating film were increased with the in- creasing of crosslinker level. With the adequate amount of crosslinker, the tensile strength of the coating could reach 18.9 MPa and the fracture elongation 324%, which could meet the requirement of rubber coatings.

关 键 词：水性聚氨酯 橡胶涂料 封闭型聚氨酯 甲乙酮肟 高温固化 

分 类 号：TQ630.4[化学工程—精细化工]