公开(公告)号：JPH04114914A

公开(公告)日：1992-04-15

申请号：JP23023190

申请日：1990-08-31

Applicant: AGENCY IND SCIENCE TECHN ,  JINKOU NENDO GOUSEI GIJIYUTSU

Inventor： SHIBAZAKI YASUO ,  MIYAWAKI RITSURO ,  MAEDA MASAKI ,  INAOKA WATARU ,  OSAKI YASUSHI ,  SAMEJIMA SOICHIRO ,  SATOKAWA SHIGEO

IPC: C04B33/04 ,  C01B33/26

Abstract: PURPOSE:To obtain a high-purity kaolinite-like mineral containing neither impurities nor unreacted substances in production by hydrothermal synthesis by blending an aqueous solution of sodium silicate with an aqueous solution of aluminum sulfate at a specific pH, subjecting Na ion to ion exchange for proton to give a gel and using the gel as a raw material. CONSTITUTION:An aqueous solution of sodium silicate is uniformly blended with an aqueous solution of aluminum sulfate while maintaining at pH 4-12 to give a mixed gel of silica and alumina. Then, Na in the gel is subjected to ion exchange for proton by using a cationic exchanging ion exchange resin containing a sulfonic group or carboxylic group as a functional group. Then, the prepared raw material gel is fed to an autoclave so as to give 5wt.% slurry concentration, subjected to hydrothermal treatment at 220 deg.C for 10 days, cooled, washed with water, filtered and dried to give a kaolinite-like mineral, a reaction product.

公开(公告)号：JPH03115115A

公开(公告)日：1991-05-16

申请号：JP25348689

申请日：1989-09-28

Applicant: AGENCY IND SCIENCE TECHN ,  JINKOU NENDO GOSEI GIJUTSU KEN

Inventor： SHIBAZAKI YASUO ,  WATAMURA SHINJI ,  MIYAWAKI RITSURO ,  MAEDA MASAKI ,  TSUYAMA TATSUMI

IPC: C04B33/04 ,  B28C1/10 ,  C01B33/26 ,  C01B33/44

Abstract: PURPOSE:To reduce the energy required to modify a kaolinite type clay mineral as compared with that by a mechanical crushing method and to considerably improve the plasticity of clay by introducing an org. compd. between the layers of the laminated structure of the clay mineral and washing a formed intralaminar compd. CONSTITUTION:An org. compd. is introduced between the layers of the laminated structure of a kaolinite type clay mineral and a formed intralaminar compd. is washed. The intralaminar compd. may be crushed before washing. The org. compd. may be potassium acetate, sodium acetate, lithium acetate, urea, potassium oxalate, glycerol or n-octylamine. In accordance with the purpose for which the resulting clay mineral is used, the org. compd. is selected and the degree of washing is regulated.

公开(公告)号：JPH02296714A

公开(公告)日：1990-12-07

申请号：JP11840089

申请日：1989-05-10

Applicant: AGENCY IND SCIENCE TECHN ,  JINKOU NENDO GOSEI GIJUTSU KEN

Inventor： SHIBAZAKI YASUO ,  MIYAWAKI RITSURO ,  WATAMURA SHINJI ,  MAEDA MASAKI ,  MIZUTA HIROYUKI ,  YAMASHITA YOSHITAKA

IPC: C01B33/26

Abstract: PURPOSE:To produce artificial kaolinite in which plasticity is maintained at high level with superior formation efficiency by carrying out hydrothermal synthesis treatment together with water by using the hydrate of amorphous calcium silicate and the strong acid salt of Al. CONSTITUTION:Hydrothermal synthesis treatment is carried out together with water by using, as raw materials, the hydrate of amorphous calcium silicate and the strong acid salt of Al, such as AlCl3, to obtain kaolinite powder. It is desirable to use, as the hydrate of amorphous calcium silicate, the one having a composition in which the atomic ratio of calcium to silicic acid is regulated to 0.1-2.0. Since the irregular tetrahedron layer of the amorphous Si can be utilized by using the hydrate of amorphous calcium silicate as raw material, kaolinite crystal formation is allowed to occur uniformly and simultaneously over the whole reaction system. Accordingly, sheet-like kaolinite reduced in crystallinity is formed.

公开(公告)号：JPH08259331A

公开(公告)日：1996-10-08

申请号：JP8870295

申请日：1995-03-22

Applicant: AGENCY IND SCIENCE TECHN

Inventor： MAEDA MASAKI ,  ODA KIICHI ,  SHIBAZAKI YASUO

IPC: C04B35/584 ,  C04B35/632

Abstract: PURPOSE: To obtain a composition for a plastic molding enabling the simplification of a fat removing process after an injection molding by adding polysaccharide high molecular materials to a highly dispersed aqueous slurry of boron nitride-based ceramic powder of a high concentration showing almost no plasticity, blending, kneading and maturing. CONSTITUTION: This composition for a plastic molding is obtained by adding a dispersing agent to a silicon nitride-based ceramic powder and a sintering assistant, adding polysaccharide high molecular materials to a highly dispersed aqueous slurry of a high concentration prepared by using water as a solvent, blending, kneading and maturing. By using this composition for plastic molding, since water as the solvent evaporates during a drying process and fine pores are produced in the molding material, troubles such as swelling or cracking in the molded product due to the thermal decomposition of organic matters do not occur.

公开(公告)号：JPH02311311A

公开(公告)日：1990-12-26

申请号：JP13366389

申请日：1989-05-26

Applicant: AGENCY IND SCIENCE TECHN ,  JINKOU NENDO GOSEI GIJUTSU KEN

Inventor： MIYAWAKI RITSURO ,  WATAMURA SHINJI ,  MIZUTA HIROYUKI ,  MAEDA MASAKI ,  SHIBAZAKI YASUO ,  MARUYAMA SHINICHI ,  SAMEJIMA SOICHIRO

IPC: C01B33/26

Abstract: PURPOSE:To obtain a kaolinite having high plasticity and imparted with crystallinity and particle size similar to those of natural clay by adding Li ion to a mixture of amorphous silica and amorphous alumina and subjecting the mixture to hydrothermal synthesis. CONSTITUTION:An aqueous solution containing 0.05 to 0.5 mol/1 of Li ion is added to a powdery raw material consisting of a mixture of amorphous silica and amorphous alumina and the obtained mixture is subjected to hydrothermal synthesis in a pressure vessel at 150 to 300 deg.C for 1 to 30 days to obtain an Li-containing kaolinite containing lattice defects in the lamination plane, having mitigated strain between a tetrahedral layer and an octahedral layer similar to a kaolinite having ideal chemical composition and having promoted lamination structure.