上转换粒子辅助近红外光热协同固化及其在涂层中的应用

Up-conversion Particle-assisted Near-infrared Photothermal Synergetic Curing and Its Application in Coatings

为探究敏化剂掺杂量对上转换粒子辅助光聚合(UCAP)热效应的影响,并充分利用热效应提高能量利用率以及固化速率,制备了一系列不同敏化剂掺杂量的NaYF4:Yb^(3+)/Tm^(3+)上转换粒子(UCPs),并利用热成像仪监测体系温度,采用实时红外表征固化动力学。结果表明:随着敏化剂掺杂量的增加,UCAP热效应增强。通过在丙烯酸酯材料中添加光引发剂和热引发剂,构建了基于UCAP的光热协同固化体系。相较于UCAP体系,光热协同固化体系固化速率显著提高,由此制备的近红外光热协同固化涂层也具有更高的固化效率,所需的近红外光辐照剂量降低了30%。

In order to explore the influence of sensitizer doping on the thermal effect of up-conversion particles-assisted photopolymerization(UCAP),and to fully utilize the thermal effect to enhance energy utilization and curing rate,a series of NaYF4:Yb^(3+)/Tm^(3+)up conversion particles with different sensitizer doping was prepared.The system temperature was monitored using a thermal imager,and real-time infrared spectroscopy was used to characterize the polymerization kinetics.The results showed that with the increase of the sensitizer doping,the thermal effect of UCAP was enhanced.By adding both photoinitiator and thermal initiator into acrylic resin materials,a UCAP-based photothermal synergistic curing system was constructed.Compared to the UCAP system,the polymerization rate of the photothermal synergistic curing system was significantly improved,and the curing efficiency of the prepared near-infrared photothermal co-curing coating materials was also higher,and the required near-infrared radiation dose was reduced by 30%.