Abstract
A synthetic method of fine powders of sodium hexatitanate was developed. First, Na2O⋅3TiO2 was prepared by calcining a 3:1 mixture of TiO2 and Na2CO3, followed by dispersion in boiling water to convert to (Na⋅H3O)O⋅3TiO2. Heating of this material at 400°C or above yielded fine powders of sodium hexatitanate. The prepared Na2O⋅6TiO2 powders with satisfactory dispersibility in paint were subjected to the test as heat insulating paint. Properties of the paint with sodium hexatitanate was excellent in infrared reflectance, infrared emissivity as well as thermal conductivity, as compared to that of the paint with aluminum flakes or rutile type TiO2 pigments widely used as heat insulating paint.
