接触角法研究氨基甲酸酯基/脲键对聚酯型聚氨酯附着牢度的影响  

Study on the Effect of Urethane/Urea on the Adhesion Fastness of Polyester Polyurethane by Contact Angle

作　　者：赵玉梅 张博 刘美琴 石红翠 ZHAO Yu-mei;ZHANG Bo;LIU Mei-qin;SHI Hong-cui(Shanxi Railway Vocational and Technical College,Taiyuan 030013,China;Shanxi Key Laboratory of Coating Polymer Functional Materials,Shanxi Research Institute of Applied Chemistry(Co.Ltd.),Taiyuan 030027,China)

机构地区：[1]山西铁道职业技术学院,太原030013 [2]山西省应用化学研究所(有限公司),涂装高分子功能材料山西省重点实验室,太原030027

出　　处：《高分子通报》2024年第2期245-256,共12页Polymer Bulletin

基　　金：山西省教育科学“十四五”规划2022年度课题(项目号GH-220230);山西省重点研发计划(高新领域)项目(项目号201903D121113);山西省重点研发计划项目(项目号202202040201013)。

摘　　要：以聚酯二元醇XCP-2000PM(PM)为软段,合成了系列具有不同氨基甲酸酯基/脲键摩尔比的聚酯型聚氨酯(PU),通过接触角法研究氨基甲酸酯基/脲键摩尔比对聚酯型聚氨酯胶膜表面能,及双向拉伸聚对苯二甲酸乙二醇酯聚酯薄膜(BOPET)与上述聚酯型聚氨酯之间黏附功的影响,并将其与BOPET粘结,研究氨基甲酸酯基/脲键摩尔比对水煮前后实际附着牢度的影响,并对其耐热性进行研究。结果表明:随着氨基甲酸酯基/脲键摩尔比的改变,表面能与黏附功的变化较小,表面能以非极性Lifshitz-vander Waals分量γLW为主,黏附功以非极性W_(Bi)^(LW)为主,二者中的酸碱作用贡献较小,但PU-P1、PU-N1表现相对较强的酸性作用。实际测试的附着牢度与理论黏附功和表面能存在一定的差异,当氨基甲酸酯基/脲键为10/90时,PU-P1、PU-N1的黏附功相对较低,因表面能中的酸碱作用及较好的润湿铺展性,而使实际附着牢度相对较好;PU-B1的黏附功最大,较大的表观黏度使其实际附着牢度最小;当氨基甲酸酯基/脲键为40/60时,附着牢度相对最好,与理论黏附功、表面能具有较好的一致性。涂层试样水煮30 min后,附着牢度均存在一定程度的下降,PU-N、PU-E能保持较好的附着牢度,而PU-B下降明显。随着氨基甲酸酯基/脲键摩尔比增大,聚氨酯初始热分解温度T_(5%)及T_(max)总体呈下降趋势,其中PU-B的T_(5%)最高,而PU-P T_(5%)最低。A series of polyester polyurethanes(PU)with different molar ratios of urethane/urea were synthesized by using polyester diol XCP-2000PM(PM)as the soft segment.The influence of urethane/urea on the surface energy of polyester polyurethane film and the adhesion work between bioriented stretching polyester film(BOPET)and PU were studied by contact angle test.The influence of urethane/urea molar ratio on adhesion fastness before and after boiling was studied when by bonded with BOPET,and its heat resistance was also studied.The results showed that with the change of urethane/urea,the overall changes of surface energy and adhesion work were small.The surface energy was mainly nonpolar Lifshitz-Vander WaalsγLW,and the adhesion work was mainly nonpolar work W^(LW)_(Bi).The acid-base contribution of the two was small,but PU-P1 and PU-N1 showed relatively strong acidic effect.There were some differences between the actually tested adhesion fastness and the theoretical surface energy and adhesion work.When the urethane/urea was 10/90,the adhesion work of PU-P1 and PU-N1 were relatively low,and the actual adhesion fastness was elatively good due to the acid-base effect in the surface energy and better wettability and spreadability;The adhesion work of PU-B1 was the largest,and its actual adhesion fastness was the smallest due to its larger apparent viscosity.When the urethane/urea was 40/60,the adhesion fastness were relatively best,which were consistent with the theoretical adhesion work and surface energy.After the coating samples were boiled for 30 min,the adhesion fastness decreased to a certain extent,while PU-N and PU-E could maintain good adhesion fastness,while PU-B decreased significantly.With the increase of urethane/urea,the initial thermal decomposition temperature T_(5%)and T_(max)of polyurethane generally showed a downward trend,and the T_(5%)of PU-B was the highest,while the T_(5%)of PU-P was the lowest.

关 键 词：氨基甲酸酯基/脲键 聚酯型聚氨酯 接触角 表面性能 附着牢度 

分 类 号：TQ323.8[化学工程—合成树脂塑料工业]