Sealing material, process for producing sealing materials, and injecting method

Abstract

The primary object of the invention is to provide a sealing material and an injection method that make sure good effects on stopping water and good durability. The inventive sealing material comprises a mixture of Materials A and B, the Material A containing fine-particle silica produced by a process in which a slurry having metallic silicon powders dispersed in water is jetted into a flame for burning and oxidization and having an average particle diameter of 1.0 μm or less, a dispersant and water and being subjected to wet dispersion, and the Material B containing a calcium compound having an average particle diameter of 1.0 μm or less, a dispersant and water and being subjected to wet dispersion. The average particle diameter is measured using a leaser diffraction type particle size distribution analyzer without subjecting the silica and the calcium compound to ultrasonic dispersion. The fine-particle silica is fine-particle spherical silica having an average sphericity of 95% or more, and the calcium compound is calcium hydroxide. Preferably, the sealing material should further contain a hardening time regulator. Preferably, the Material A and/Material B should be produced by a pulverizer using high-pressure water.

1 . A sealing material, characterized by being a mixture of wet dispersed Material A and wet pulverized and dispersed Material B, said Material A containing fine-particle silica having an average particle diameter of 1.0 mm or less as measured using a laser diffraction type particle size distribution analyzer without subjecting said fine-particle silica to ultrasonic dispersion, a dispersant and water, and said Material B containing a calcium compound having an average particle diameter of 1.0 mm or less as measured using a laser diffraction type particle size distribution analyzer without subjecting said calcium compound to ultrasonic dispersion, a dispersant and water, wherein said fine-particle silica has been produced by a process in which a slurry having metallic silicon powders dispersed in water is jetted in a flame for burning and oxidization. 
     
     
         2 . A sealing material as recited in  claim 1 , wherein said Material A is a mixture of a dispersant with a wet dispersed suspension containing fine-particle silica having an average particle diameter of 1.0 mm or less as measured using a laser diffraction type particle size distribution analyzer without subjecting said fine-particle silica to ultrasonic dispersion, and water. 
     
     
         3 . A sealing material as recited in  claim 1 , wherein said Material A is a mixture of a dispersant and water with a wet dispersed suspension containing fine-particle silica having an average particle diameter of 1.0 mm or less as measured using a laser diffraction type particle size distribution analyzer without subjecting said fine-particle silica to ultrasonic dispersion and water. 
     
     
         4 . A sealing material as recited in  claim 1 , wherein said fine-particle silica is fine-particle spherical silica having an average sphericity of 95% or more. 
     
     
         5 . A sealing material as recited in  claim 1 , wherein said Material B is a mixture in which water is further mixed with a wet pulverized and dispersed suspension containing a calcium compound having an average particle diameter of 1.0 mm or less as measured using a laser diffraction type particle size distribution analyzer without subjecting said calcium compound to ultrasonic dispersion, a dispersant and water. 
     
     
         6 . A sealing material as recited in  claim 1 , wherein said calcium compound is calcium hydroxide. 
     
     
         7 . A sealing material as recited in  claim 1 , wherein the dispersant in said Material A is used in an amount of 0.1 to 30 parts by mass (calculated as a solid matter) per 100 parts by mass of the fine-particle silica. 
     
     
         8 . A sealing material as recited in  claim 1 , wherein the dispersant in said Material B is used in an amount of 1 to 30 parts by mass (calculated as a solid matter) per 100 parts by mass of the calcium compound. 
     
     
         9 . A sealing material as recited in  claim 1 , which further contains a hardening time regulator. 
     
     
         10 . A process for producing a sealing material, characterized in that water is added to fine-particle silica produced by a process in which a slurry having metallic silicon powders dispersed in water is jetted into a flame for burning and oxidization, the resulting material is wet dispersed with a pulverizer using high-pressure water thereby obtaining a suspension containing fine-particle silica having an average particle diameter of 1.0 mm or less as measured using a laser diffraction type particle size distribution analyzer without subjecting said fine-particle silica to ultrasonic dispersion, and a dispersant and, if required, water are mixed with said suspension thereby producing Material A, whereas a dispersant and water are added to a calcium compound, the resulting material is wet pulverized and dispersed with a pulverizer using high-pressure water thereby obtaining a suspension containing a calcium compound having an average particle diameter of 1.0 mm or less as measured using a laser diffraction type particle size distribution analyzer without subjecting said calcium compound to ultrasonic dispersion, a dispersant and water, and water is mixed with said suspension, if required, thereby producing Material B, and finally said Materials A and B are mixed together. 
     
     
         11 . A process for producing a sealing material as recited in  claim 10 , wherein said fine-particle silica is fine particle spherical silica having an average sphericity of 95% or more. 
     
     
         12 . A process for producing a sealing material as recited in  claim 10 , wherein said calcium compound is calcium hydroxide. 
     
     
         13 . A process for producing a sealing material as recited in  claim 10 , wherein a hardening time regulator is further mixed with said Material A. 
     
     
         14 . An injection method, in which wet dispersed Material A and wet pulverized and dispersed Material B are mixed together for injection, said Material A containing fine-particle silica having an average particle diameter of 1.0 mm or less as measured using a laser diffraction type particle size distribution analyzer without subjecting said fine-particle silica to ultrasonic dispersion, a dispersant and water, and said Material B containing a calcium compound having an average particle diameter of 1.0 mm or less as measured using a laser diffraction type particle size distribution analyzer without subjecting said calcium compound to ultrasonic dispersion, a dispersant and water, characterized in that said fine-particle silica has been produced by a process in which a slurry having metallic silicon powders dispersed in water is jetted into a flame for burning and oxidization. 
     
     
         15 . An injection method as recited in  claim 14 , wherein said Material A is a mixture of a dispersant with a wet dispersed suspension containing fine-particle silica having an average particle diameter of 1.0 mm or less as measured using a laser diffraction type particle size distribution analyzer without subjecting said fine-particle silica to ultrasonic dispersion, and water. 
     
     
         16 . An injection method as recited in  claim 14 , wherein said Material A is a mixture of a dispersant and water with a wet dispersed suspension containing fine-particle silica having an average particle diameter of 1.0 mm or less as measured using a laser diffraction type particle size distribution analyzer without subjecting said fine-particle silica to ultrasonic dispersion, and water. 
     
     
         17 . An injection method as recited in  claim 14 , wherein said fine-particle silica is fine-particle spherical silica having an average sphericity of 95% or more. 
     
     
         18 . An injection method as recited in  claim 14 , wherein said material B is a mixture of additional water with a wet pulverized and dispersed suspension containing a calcium compound having an average particle diameter of 1.0 mm or less as measured using a laser diffraction type particle size distribution analyzer without subjecting said calcium compound to ultrasonic dispersion, a dispersant and water. 
     
     
         19 . An injection method as recited in  claim 14 , wherein said calcium compound is calcium hydroxide. 
     
     
         20 . An injection method as recited in  claim 14 , wherein the dispersant in said Material A is used in an amount of 0.1 to 30 parts by mass (calculated as a solid matter) per 100 parts by mass of the fine-particle silica. 
     
     
         21 . An injection method as recited in  claim 14 , wherein the dispersant in said Material B is used in an amount of 1 to 30 parts by mass (calculated as a solid matter) per 100 parts by mass of the calcium compound. 
     
     
         22 . An injection method as recited in  claim 14 , in which a hardening time regulator is further contained. 
     
     
         23 . An injection method as recited in  claim 14 , wherein said Material A and said Material B are mixed together by any one of a one-shot method, a 1.5-shot method and a two-shot method, and then injected into a ground or the like.