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FIRE-PREVENTING CHEMICAL AGENT FOR WOODY MATERIAL, FIRE-PREVENTING WOODY MATERIAL USING THE CHEMICAL AGENT AND PRODUCTION METHOD FOR THE FIRE-PREVENTING WOODY MATERIAL
FIRE-PREVENTING CHEMICAL AGENT FOR WOODY MATERIAL, FIRE-PREVENTING WOODY MATERIAL USING THE CHEMICAL AGENT AND PRODUCTION METHOD FOR THE FIRE-PREVENTING WOODY MATERIAL
PROBLEM TO BE SOLVED: To provide a fire-preventing chemical agent for woody material in which the pH of an aqueous solution of the chemical agent is in a range from weak acidity to neutrality; the material color change of the woody material when a fire preventing treatment is performed is minor; the hygroscopic property of the woody material after treatment is low; and the blowout or efflorescence of the chemical agent can be restrained, and also to provide a fire-preventing woody material using the above chemical agent and a production method for the woody material.;SOLUTION: A fire-preventing chemical agent comprises phosphoric acid and/or inorganic salt thereof, urea and an aqueous solution in which the organic salt of phosphoric acid is dissolved. The organic salt of phosphoric acid is phosphoric urea, phosphoric guanylurea, a compound of phosphoric urea and phosphoric guanylurea, or a compound of those and the other organic salt of phosphoric acid, and that organic salt dissolves exceeding its single solubility. The inorganic salt of phosphoric acid is an ammonium salt. In the aqueous solution, the compounding ratio of phosphoric acid and/or the inorganic salt thereof to urea is in the range of 1:1 to 1:2 in molar ratio, and pH of the aqueous solution is in the range of 4 to 8.;SELECTED DRAWING: Figure 4
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