近红外吸收PC滤光片的制备与性能研究

使用染料-高聚物混合(dye-in-polymer)的方法将近红外吸收染料作为功能添加剂分散在聚碳酸酯(PC)中,采用注塑成型的方法制备了用于夜视兼容照明的近红外吸收滤光片.研究了近红外吸收剂在PC材料中的吸收行为,确定了近红外吸收剂的添加量,最终制备的近红外吸收滤光片在660～930 nm波长范围内有良好的吸收能力,在此波段范围内的光线透过率为0.15%,同时在450～630 nm波长范围内保持了较好的可见光透过性.按照标准测试手段对样品的耐热老化性能,耐光老化性能和力学性能进行了测试.结果表明,制备的近红外吸收滤光片性能稳定,强度大,具有良好的应用性能.

PREPARATION AND PROPERTIES OF POLYCARBONATE NEAR-INFRARED ABSORPTION FILTER

A new near-infrared(NIR) absorption filter with good optical and mechanical properties was prepared by injection molding method.It was made by NIR-dyes and polycarbonate.This NIR absorption filter can be applied on light apparatus for night vision imaging system(NVIS) compatible lighting.The optical performance of the filter was studied.The filter material offers sufficient transmittance in the visible spectrum along with excellent extinction in the NIR region.The results also showed there was a good linear relationship between its absorbance and NIR-dye dosage.This means that the optical property of the filter can be easily controlled by changing the amount of NIR-dyes.A NIR absorption filter with optimal dye dosage was prepared.The filter has a transmittance not higher than 0.15% in the NIR region in the wavelength range of 660~930 nm;a 16% value of transmittance in the wavelength range of 400~630 nm.The filter is excellent in environmental stability that after being left to stand in the air atmosphere at temperature of 85℃ and exposed to light condition at 1120 W/m2 for 200 h,the filter can maintain its spectral property in the said range.Its bending strength is 107 MPa,shock strength is 54.4 kJ/m2.Therefore the filter can stand strong mechanical impact in the actual application environment.