| 摘要 |
PURPOSE: A manufacturing method of a non-flammable lightweight panel is provided to improve surface hardness or surface strength and wear resistance or scratch resistance by forming a surface reinforcement layer on a surface of hardened lightweight material. CONSTITUTION: A manufacturing method of a non-flammable lightweight panel comprises following steps. (a) A lightweight green compact is manufactured by mixing a powder binder, water, and expanded perlite. (b) The green compact on the step (b) is cured for 1-2 hours at high temperature of 60-120 degrees C. And (c) a surface reinforcement layer is formed by spraying magnesia phosphate based coating material on the surface of the dried and cured green compact. The lightweight green compact comprises 20-70 part by weight of the water and 30-150 part by weight of the expanded perlite about 100 part by weight of the powder binder. The powder binder comprises 40-99 weight percent of alpha-hemihydrate gypsum and 1-60 weight percent of white cement. The magnesia phosphate based coating material comprises 20-60 weight percent of fine grinded potassium phosphate monobasic (KH2PO4), 10-50 weight percent of magnesium hydroxide (Mg (OH)2), and 25-50 weight percent of the water. [Reference numerals] (AA) Start; (BB) End; (S10) Mold a lightweight product into a specific shape by mixing a power binder consisting of gypsum hemihydrate and white cement, mixed water, and expanded perlite; (S20) Cure the molded product at 60-120 degrees C for 1-2 hours; (S30) Form a surface-reinforcing layer by spreading a magnesia phosphate salt-based spreading agent onto the surface of the molded product
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