关键词: 红外遮光剂;硅酸盐隔热保温涂料;导热系数;红外透过率;消光系数

Abstract: The silicate thermal insulating coatings were prepared by means of high speed mechanical agitation when the sodium silicate was used as the binder of the coatings and silica aerogel was added as one of thermal insulating aggregetes in the respective presence of K2Ti6O13 whisker(PTW), rutile titanium dioxide(TiO2) and TiO2 sol as infrared opacifiers.The effects of infrared opacifiers on the infrared transmittance, extinction coefficient and thermal conductivity of the coatings were studied.The results show that TiO2 sol has the best dispersing performance among the three kinds of infrared opacifiers.The coating added with TiO2 sol has the lowest infrared transmittance, the biggest extinction coefficient and the lowest thermal conductivity low to 0.032 W·m-1·K-1.

Key words: infrared opacifier;silicate thermal insulating coating;thermal conductivity;infrared transmittance;extinction coefficient