Thermal insulation master batch prepared using yellow tungsten oxide powder as raw material has excellent heat insulation performance and can be used for the preparation of heat-insulating films or plates. And the yellow tungsten oxide can be prepared by chemical precipitation method, whose specific preparation processes are as described below.
Preparation of Yellow Tungsten Oxide Powder by Chemical Precipitation Method
The first step: Weigh 3.000g of sodium tungstate and 0.0050g of PVP, dissolve them in 30mL of distilled water, and mix well.
The second step: 3mL of the above solution was dropped into 5mL of HCl with a concentration of 3mol•L-1, and stirred for 2 hours to make it react completely.
The third step: Centrifugal sedimentation, then wash with distilled water and acetone 3 to 4 times repeatedly.
The fourth step: Dry in a forced air oven at 80°C for 6-7 hours, and burn in a muffle furnace at 300°C for 3 hours to obtain yellow powder.
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