| 摘要 |
<p>PROBLEM TO BE SOLVED: To inexpensively obtain a board having excellent heat resistance, flame retardance and soundproofing properties, not emitting a toxic gas by formulating a powder mixture having a specific composition composed of a vegetable fiber, inorganic powder, an acid and a coloring matter with an aqueous solution of sodium metasilicate, kneading, molding the mixture under pressure and drying. SOLUTION: A vegetable fiber of powder raw material in an amount of 15-60% is sufficiently formulated with 5-30% of inorganic powder of functional material, 2-10% of an acid and about 2.5% of a coloring matter. The vegetable fiber is preferably a cellulose having 10-300μm diameter and 30-300μm length. The inorganic powder is preferably a metal oxide having 0.3-300μm diameter and natural stone named Hanmokustone, or the like, are used. An acid having 0.5-1,000μm is used. The powder mixture is kneaded with an aqueous solution of sodium metasilicate and uniformly dispersed. The aqueous solution of sodium metasilicate is obtained by adding 5-80% of sodium metasilicate to water and mixing. The kneaded material is molded under pressure and dried to give the objective high-strength flame-retardant board.</p> |
