钴基热致变色材料及多变色示温涂层的制备

Preparation of Cobalt-based Thermochromic Materials and Multi-color Thermochromic Coatings

目的制备一种在120~200℃内具有多种热致变色行为的不可逆示温涂层,用于快速排查和准确记录电网设备过热故障发生地点。方法首先以碳酸钴和氯化钴为原料,用简单的溶液法在水中制备了两种钴基热致变色材料。再以有机硅WB300树脂作为成膜物,自制的两种材料和偏钒酸铵作为变色颜料,高速研磨4~5 h,获得变色涂料。通过XPS、XRD、FT-IR和SEM等测试手段对变色材料进行结构和微观形貌表征。于干燥箱加热观察涂层在120~200℃内的热色性,并用色差计和图像处理软件对变色点进行数据化处理。结果结合XRD、XPS、FT-IR和TG等一系列表征,证明深绿色的三草酸合钴酸钾在130℃变为粉红色的草酸钴,玫瑰红色的磷酸钴铵在180℃变为深蓝色的磷酸氢钴。涂层附着力达到一级,耐冲击性为50 cm未出现涂层破裂,硬度为2H,在120~200℃具有5~6个变色点,并建立了色-温函数模型。结论成功自制两种钴基热致变色材料。通过配色,成功制备了色差明显的多变色示温涂层,基本物理性能均满足常规涂层国家标准,涂层加热至200℃都变为黑色,不再改变。

This work aims to prepare an irreversible thermochromic coating with a variety of thermochromic behaviors in the range of 120 to 200℃,which can be used to quickly troubleshoot and accurately recorded the overheating fault location of power grid equipment.First,two cobalt-based thermochromic materials were prepared from cobalt carbonate and cobalt chloride in water by a simple solution method.The thermochromism coatings were obtained by high speeded grinding for 4~5 h with silicone WB300 resin as film forming material,two kinds of self-made materials and ammonium metavanadate as chromic pigment.The structure and microstructure of the material were characterized by XPS,XRD,FT-IR and SEM.The thermal color of the coating was observed by heating in a drying oven in the range of 120 to 200℃,and the color difference meter and image processing software were used for data processing of the color change points.Combined with XRD,XPS,FT-IR and TG characterization,it is proved that the dark green potassium tris oxalate cobalt oxalate changed to pink cobalt oxalate at 130℃,and the rose red ammonium cobalt phosphate changed to dark blue cobaltous hydrophosphate at 180℃.The adhesion of the coating reaching the first level,the impact resistance is 50 cm,no coating rupture appearing,and the hardness is 2H.There are 5~6 discoloration points at 120 to 200℃,and the color-temperature function model is established.Two cobalt-based thermochromic materials are made successfully.The polychromic temperature indicator coating with obvious color difference was successfully prepared by color matching.The basic physical properties all met the national standard of conventional coating.The coating will turn black when heated to 200℃and will not change.