【作者】 李艳；

【导师】 刘平； 胡建华；

【作者基本信息】 华南理工大学 ， 工程硕士（专业学位）， 2018， 硕士

【摘要】 随着人们生活水平的提高,汽车己经进入千家万户。近年来,中国汽车工业得到了高速的发展,这也使得整车制造工艺必须不断的完善和更新,在这种情况下对与汽车配套的材料也提出了更高的要求。本论文中,作者采用双氨基硅烷偶联剂(Z6020)和聚乙烯基硅烷偶联剂(A-172)对聚氯乙烯(PVC)车底胶进行了改性,以期改善和提高在造车阶段PVC车底胶的抗流挂滑落性能。通过傅立叶红外光谱(FT-IR)、示差扫描量热(DSC)和扫描电镜(SEM)以及接触角等的测试对硅烷偶联剂改性PVC车底胶进行了表征,研究了其抗流挂滑落性能。研究结果表明,硅烷偶联剂与PVC车底胶能够形成互穿聚合物网络(IPN)。另外,经改性后PVC车底胶,其疏水性得到了提高,对电泳板的润湿性更好,改性后的PVC车底胶与电泳板之间能形成氢键的相互作用。与未改性的PVC车底胶相比,改性后PVC车底胶的滑落距离由70mm改善为无滑落,流挂距离由19mm降低至1mm。改性后PVC车底胶的抗流挂滑落性能得到提高。本论文中,作者还采用硅烷偶联剂(KH550)对聚氨酯预聚体进行了改性,以期提高聚氨酯玻璃胶的性能。改性的结果表明:改性后的聚氨酯预聚体在固化时无气泡产生,力学性能得到提高,与未改性的聚氨酯预聚体相比,改性后的聚氨酯预聚体的硬度、拉伸强度、断裂伸长率较未改性的聚氨酯预聚体分别提高了 60%、65%、87%;表干时间可缩短近1天,固含量可提高3%,达到98%。用改性聚氨酯预聚体为原料制备的玻璃胶,其硬度为45HA,拉伸强度为3.02 MPa,断裂伸长率为435%,其力学性能得到提高。另外,改性后的聚氨酯预聚体与玻璃板和钢板之间不仅具有好的粘接性能,还具有好的热稳定性以及抗流淌性,表干时间为35分钟,既能确保有足够的施工时间,又能确保在施工后尽快表干,提高了生产效率。更多还原

【Abstract】 With the improvement of people’s living standard,cars have entered into thousands of families.In recent years,China had obtained high speed development of automobile industry,it also makes the vehicles manufacturing process constantly improve and update.In this case for auto accessories and materials are also put forward higher requirements.In this paper,the author added double amino silane coupling agent(Z-6020)and polyvinyl silane coupling agent(poly A-172)in PVC under body sealer for modification,in order to improve and enhance its sagging and slidding performace.Characterized the modified PVC under body sealer with silane coupling agent by Fourier Transform infrared spectroscopy(FT IR),Differential Scanning Calorimetry(DSC)and Scanning Electron Microscope(SEM)and contact Angle test and studied its sagging and slidding performace.The results show that the silane coupling agent and PVC under body sealer can form interpenetrating polymer network(IPN).Moreover,after modification,the hydrophty is improved,and the wettability on ED panel is better,and formed hydrogen bond between PVC under body sealer and ED panel.Compared with unmodified PVC under body sealer,the sliding distance is improved from 70mm to 0mm,and the sagging distance is decreased from 19mm to 1mm.The anti-flow performance of modified PVC under body sealer has been improved.In this paper,the authors also modified the polyurethane prepolymer with silane coupling agent(KH550)in order to improve the performance of polyurethane glass.The results shows that the modified polyurethane pre polymers is no bubbles during curing,and mechanical performance is improved.Compared with the unmodified polyurethane pre polymers,hardness,tensile strength,elongation of modified pre polymers are increased by 60%,65%,and 65%.The drying time can be shortened by nearly 1 day,and the solid content can be increased by 3%,reach to 98%.The hardness of the glass cement used the modified polyurethane prepolymer,was 45HA,the tensile strength was 3.02 MPa,the elongation was 435%,its mechanical properties were improved.Moreover,the modified polyurethane pre polymer has good adhesion both with glass and steel,good thermal stability and resistance to flow.The drying time is 35 minutes,it can ensure enough work time and drying as soon as possible at the same time,the production efficiency was improved.更多还原