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Title:
METHOD FOR PRODUCING NONCOMBUSTIBLE MATERIAL, AND NONCOMBUSTIBLE MATERIAL
Document Type and Number:
WIPO Patent Application WO/2020/054838
Kind Code:
A1
Abstract:
[Problem] To ensure the noncombustibility of a noncombustible material by boric acid alone without adding an additive to promote the dissolution of boric acid. [Solution] First, an object 2 to be treated, which serves as the main material of a noncombustible material, is placed in an impregnation tank 1 in which is stored a boric acid aqueous solution. The boric acid aqueous solution is a solution of boric acid dissolved in water without adding an additive to promote the dissolution of boric acid in water. Next, the boric acid introduced into the impregnation tank 1 is furthermore dissolved while raising the temperature of the boric acid aqueous solution under a pressurized environment, whereby the concentration of the boric acid aqueous solution with which the object 2 to be treated is to be impregnated is made higher than the maximum solubility under an atmospheric-pressure environment. Then, the temperature of boric acid aqueous solution, the concentration of which has been raised, is reduced under conditions that maintain a pressurized state at least until the temperature drops to the boiling point under an atmospheric-pressure environment, thereby precipitating the boric acid with which the object 2 to be treated is impregnated.

Inventors:
FUKUDA HIROATSU (JP)
TANIYAMA TATSUAKI (JP)
OTSUKA MASAHIKO (JP)
Application Number:
PCT/JP2019/036071
Publication Date:
March 19, 2020
Filing Date:
September 13, 2019
Export Citation:
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Assignee:
THE UNIV OF KITAKYUSHU (JP)
SANEI ARCH PLANNING CO LTD (JP)
International Classes:
C09K21/02; B27K3/02; B27K3/16
Domestic Patent References:
WO1991000327A11991-01-10
Foreign References:
JP2007001120A2007-01-11
JP2008074670A2008-04-03
JP2007090839A2007-04-12
US4801404A1989-01-31
JPS59199585A1984-11-12
JPS4916922B11974-04-25
Attorney, Agent or Firm:
KUMEGAWA Masamitsu (JP)
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