Nano yellow tungsten oxide may be applied for manufacturing thermal insulation paper so that this type of paper will have high heat insulation, high temperature resistance, high tensile strength, good elasticity, flame retardance, heat preservation, good sealing, insulation and excellent electrical insulation properties.
Therefore, this thermal insulation paper can be applied to high-temperature insulation gaskets, ladle steel nozzles, denitrification catalyst thermal insulation gaskets, glass hot bending furnace demolding, cast aluminum model linings, muffler insulation materials of automobile mufflers, car exhaust pipe insulation materials, and so on.
And therefore, it is necessary to study the producing method of yellow tungsten oxide. The following mainly describes the processes of chemical precipitation method to prepare yellow tungsten oxide: Weigh 3.0g Na2WO3 and 0.005g CTAB and dissolve them in 10mL distilled water. Then, 3mL of this solution was slowly added dropwise to 5mL of 3mol?L-1 HCL and stirred for 1–2h. The reacted solution was subjected to centrifugal sedimentation, and then washed repeatedly with distilled water and acetone. Then, the obtained precipitate was dried in oven at 80°C to obtain precursor. The precursor was placed in muffle furnace and calcined at 300°C for 3h to obtain yellow powder.
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