论文部分内容阅读
透明涂料的双重固化(热固化和UV固化)为层面涂装和汽车的更多特种部件的发展提供了巨大的发展前景.因为其可能解决紫外固化的屏蔽区的固化不完全的问题[1].在先前的论文中,已经证实了UV光张度(辐射密度,I0)对暴露膜表面和丙烯酸酯中分子结构的双键转换的深层断面的氧抑制作用的影响[2～6].近期的研究评价了具有不同玻璃化温度的固态聚合物基体对丙烯酸酯结构中双键转换的影响.探讨了UV固化配方和双重固化配方之间比较的一种直接判断的性能.研究中所使用的固态聚合物基体包括:聚甲基丙烯酸甲酯(PMMA,Tg114℃,平均重均分子质量W120000)和聚甲基丙烯酸丁酯(PBMA,Tg15℃,MW=337000).通过改变单体和齐聚物混合物的分子质量的比以及固态聚合物基体的总含量,调整有氧存在或无氧存在的暴光时间(即固化速度)来进行研究工作,对于这个双重固化配方还用恒定的UV能量辐射评价了残余双键.用FTIR证实了剩余双键.讨论了紫外固化和双重固化配方的自游基迁移性和氧抑制作为配方体系粘度的功能函数.这些研究工作是基础性的而且是非常重要的.其目的是探索双重固化透明涂料的工业应用.“,”A high potential prospect in surface coating and more specifically for automobile bodies had provided by dual cure (thermal and UV) of clear coatings,where some drawbacks of UV curing could be overcome such as shadow area cure problem[1].In our previous papers,and effect of UV light intensity(Irradiance,I0) on oxygen inhibition at surface of exposed films and the depth profile(Cd) of double bond conversion in acrylated formulations had been demonstrated[2～6].In this study,an influence of a solid “polymer matrix” with different Tg.on double bond conversion in acrylate based formulations were evaluated.A direct performance comparison between a UV curable formulation and a dual curable formulation was undertaken.The “solid polymer matrix”,exposure time(cure speed) and in presence or absence of oxygen.For the dual cure formulation,the double bond residue was also evaluated using constant UV energy delivery.The double bond residue was obtained by the use of FTIR.Free radical mobility and oxygen inhibition in UV curable formulation and dual curable formulation as a function of visosity of formulation are discussed.The results from this research work were fundamental and very important in order to explore dual clear coating applications in general.