To provide a method for producing a high-strength heat insulating material with slight adverse effects on human bodies due to no asbestos contained therein and excellent in heat resistance, mechanical strength, toughness, etc., while having good processability.
This method for producing a heat insulating material comprises impregnating 100 pts.wt. of an inorganic fibrous sheet with 300-500 pts.wt. of an inorganic paste comprising 40-80 wt.% of a heat-resistant powder, 5-40 wt.% of aluminum primary phosphate and 5-20 wt.% of a curing agent for the aluminum primary phosphate, forming the paste impregnated sheet, drying the paste-impregnated sheet at 60-150°C, forming sheetlike materials, laminating the resultant sheetlike materials, thermocompression forming the obtained laminate at 150-200°C under 20-50 kgf/cm2, forming an inorganic formed compact and after curing the inorganic formed compact at 180-230°C. The obtained heat insulating material comprises 10-50 wt.% of the inorganic fibrous sheet and 50-90 wt.% of an inorganic composition which is a reactional product of the inorganic paste.
TAKAHIRO KENICHI
HIRAMATSU KENGO
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