Study On Preparation And Properties Of Transparent Heat Insulation Coatings Based On Nano-Copper Sulfide With Multiple Morphologies

In this paper,copper sulfide nanomaterials with multiple morphologies were prepared,and the effects of sulfur sources and preparation methods on the morphology of copper sulfide were studied.Subsequently,the copper sulfide nanomaterial was dispersed in acrylic-amino-alkyd baking varnish and applied to the surface of ordinary glass substrate.The feasibility of nanocopper sulfide as a functional material for transparent thermal insulation coatings and the effects of different morphologies of nano-copper sulfide on the light selection shielding performance of transparent thermal insulation coatings were both discussed.Our work can be divided into 4 parts:(1)Polyvinylpyrrolidone-modified copper sulfide nanoplates were synthesized by hydrothermal method with ammonium sulfide as the sulfur source,and then the copper sulfide nanoplates were mixed with acrylic-amino-alkyd baking varnish and coated on the glass surface to form a coated glass(C-X-Y).The optical properties of C-X-Y were studied by using UVVis-NIR spectrophotometer and home-made thermal insulation test device.The results showed that the transmittance of a 150 ?m-thick C-X-Y coating with 1.0 wt% CuS nanoplates(C-1.0-150)at 550 nm was 70.38 %,and the average transmittance on the region of 760-2500 nm was 27.98 %.Besides,the stable temperature inside the box covered with the C-1.0-150 was 12.0 °C lower than that with the reference coating C-0.0-150(without CuS nanoplates)under the irradiation of a 250 W infrared lamp.(2)Commercially available ITO glass,C-0.0-150 and C-0.5-150 coated glasses were used as samples to compare the three quantification methods for transparent heat insulation performance of glass.Finally,calculating the SETS value of coated glass was selected as the quantitative standard in this paper.Moreover,calculate the SETS value for C-X-Y series coated glasses,where C-1.0-150 has the highest SETS value of 0.6680.(3)Snowflake-shaped copper sulfide nanoplates were prepared by liquid-phase precipitation method using thiourea as the sulfur source.The effects of ammonia consumption and the type of protective agent on the morphology of nano-copper sulfide were analyzed by scanning electron microscopy.Moreover,the coated glass S-X-Y with the highest SETS value of 0.6622 for S-1.5-150 was prepared by using snowflake-shaped copper sulfide nanoplates.Compared with C-1.0-150 coated glass,the visible light transmittance of S-1.5-150 has been improved and the preparation method is simpler.Besides,using the tasteless thiourea as the sulfur source,which greatly reduces the production cost.(4)The copper sulfide hollow nanofibers and copper sulfide superstuctures were prepared to optimize the weak shielding phenomenon of the C-X-Y and S-X-Y coated glasses in the region of 1500-2500 nm.The results show that the copper sulfide hollow nanofibers ameliorate the phenomenon of transmittance increase rapidly with wavelength increasing in the region of 1500-2500 nm,but the coated glasses with copper sulfide hollow nanofibers as functional material have a very low SETS value.Moreover,the copper sulfide superstuctures really change the weak shielding phenomenon in the region of 1500-2500 nm,making the SETS value increase from 0.6680 in C-1.0-150 to 0.6772.It shows that the performance of the transparent thermal insulation coating can be improved by constructing the superstructure of nano-copper sulfide.