紫外光固化聚合物涂层的原位光稳定化研究

Photo-stabilization in situ of Reactive-hindered Amine Derivatives(r-HALS) Applied in UV-curing Coatings

选用实验室制备的四种新型反应型受阻胺类光稳定剂(r-HALS):4-甲基丙烯酰氧基-2,2,6,6-四甲基哌啶醇酯(MTMP)、4-丙烯酰氧基-2,2,6,6-四甲基哌啶醇酯(ATMP)、4-甲基丙烯酰氧基-1,2,2,6,6-五甲基哌啶醇酯(MPMP)和4-丙烯酰氧基-1,2,2,6,6-五甲基哌啶醇酯(APMP),实现了紫外光固化聚合物涂层(膜)的原位(in situ)光稳定化。通过室内人工光老化实验和在光氧化过程中黄度指数(Yellowness Index,YI)的监测,再与典型的商用HALS(Tinuvin770和Tinuvin292)进行平行实验对比,考察了r-HALS对紫外光固化聚合物涂层的光防护效果,探索一条紫外光固化聚合物涂层原位(in situ)光稳定化的新途径。

The synthesis and characterization of four reactive hindered piperidinol derivatives, 4 - methacryloyl - 1,2,2,6,6 - pentamethyl - piperidinyl（MPMP） ,4 - acryloyl - 1,2,2,6,6 - pentamethyl - piperidinyl （ APMP）, 4 - methacryloyl - 2,2,6,6 - tetramethyl - piperidinyl （ATMP） and 4 - cryloyl - 2,2,6,6 - tetramethyl - piperidinyl（MTMP） as reactive- hindered amine light stabilizers （r- HALS） were reported. The in situ photo -stabilizing effects of these r - HALS applied in UV - curing coatings were evaluated using Yellowness Index as a charac- terizing parameter. It is found that r - HALS are superior to the corresponding commercial HALS such as Tinuvin770 and Tinuvin292, which may be attributed to better dispersion and reduced migration （or evaporation） on the surface of the coatings matrix.