采用异佛尔酮二异氰酸酯(IPDI)、四氟丙醇(TFP)与三羟甲基丙烷(TMP)合成了一种含氟二元醇F-TMP,并将其作为扩链剂对超支化聚氨酯丙烯酸酯(PUA)改性,合成了一系列用于减反射涂层不同氟含量的超支化聚氨酯丙烯酸酯(FPUA)树脂.采用傅里叶红外光谱(FT-IR)对FPUA的结构进行了表征,并对固化过程中的双键转化率进行了固化动力学监测.结果表明:氟元素有效地接入了 FPUA树脂中,其双键转化率与光固化涂料的初始粘度有关.进一步测试了光固化涂层的光学性能、附着力、硬度、柔韧性、耐水性以及热稳定性.结果表明,氟改性后涂层综合性能得到显著改善,耐水和耐化学品性能均有提高,当聚己二醇新戊二醇酯(PNA)与F-TMP的物质的量比为1∶0.5时,涂层的光透过率达到93.7％,光折射率为1.413,反射率2.11％,具有优异的光学性能,同时还具有最佳的热稳定性以及力学性能,附着力等级0,硬度可达91.5HD,柔韧性低至2 mm.
Synthesis and properties of fluorine-containing hyperbranched polyurethane acrylates for reflectance-reducing coating
The fluorinated diol F-TMP was synthesized using isophorone diisocyanate(IPDI),tetrafluoropropanol(TFP)and trimethy-lolpropane(TMP).As a chain extender,the F-TMP was employed to modify hyperbranched polyurethane acrylate(PUA).In addition,a series of hyperbranched polyurethane acrylate(FPUA)resins were synthesized for reflectance reduction coating with different fluorine contents.The Fourier infrared spectroscopy(FT-IR)was used to characterize the structure of FPUA and to monitor the curing kinetics of the double-bond conversion rate during the curing process.The results demonstrated that the elemental fluorine was efficiently accessed into the FPUA resin.The double-bond conversion rate was related to the initial viscosity of the UV cured coatings.The optical proper-ties,adhesion,hardness,flexibility,water resistance and thermal stability of the UV cured coating were further tested.The comprehen-sive performance of the coating was significantly improved after fluorine modification,and the water and chemical resistance were im-proved.Whenthemolarratioofpolyhexyleneglycolneopentylglycol(PNA)to F-TMP was 1∶0.5,the optical transmittance of the coating reached 93.7％,with a photorefractive index of 1.413 and a reflectance of 2.11％,providing excellent optical properties.Meanwhile,the coating had the best thermal stability and mechanical properties,with adhesion class O,hardness up to 91.5 HD,and flexibility as low as 2 mm.
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