초록 ▼

Cementitious magnesia compositions are disclosed containing at least one of a family of organo-silicon compounds, each of which is characterized in having attached to the silicon atom at least one group hydrolyzable at the silicon atom and at least one group comprising a moiety that is attached to t

Cementitious magnesia compositions are disclosed containing at least one of a family of organo-silicon compounds, each of which is characterized in having attached to the silicon atom at least one group hydrolyzable at the silicon atom and at least one group comprising a moiety that is attached to the silicon atom through a substantially non-hydrolyzable silicon-carbon bond. Magnesia compositions containing one of the described organo-silicon compounds, wherein the non-hydrolyzable moiety has a working parameter of solubility, dwp, typically in the range of about 6.2 to about 8.0 (cal./cc)½, have improved casting, molding or spraying properties as compared to magnesia compositions lacking the organo-silicon compound.

대표청구항 ▼

A moldable, castable or sprayable cementitious composition, comprising: (a) magnesium oxide; (b) a magnesium salt having at least moderate solubility in water; (c) at least one organo-silicon compound, characterized in having attached to the silicon atom (i) at least one group having a hydrolyzable

A moldable, castable or sprayable cementitious composition, comprising: (a) magnesium oxide; (b) a magnesium salt having at least moderate solubility in water; (c) at least one organo-silicon compound, characterized in having attached to the silicon atom (i) at least one group having a hydrolyzable bond with the silicon atom and selected from the group consisting of halogen, hydroxyl, alkoxyl, aryloxyl, substituted aryloxyl, aralkoxyl, substituted aralkoxyl, alkylamino, substituted alkylamino, silylamino, substituted silylamino, mercapto and substituted mercapto and (ii) at least one moiety attached through a substantially non-hydrolyzable silicon-carbon bond, wherein the moiety has a working parameter of solubility, dwp, in the range of about 6.2 to about 8.0 (cal./c.c.)½, with [Figure] wherein: Fi=the molar attraction constant of an individual functional group of said moiety expressed in (cal. c.c.)½per mole, and Vi=the molar volume constant of an individual group of said moiety expressed in c.c. per mole; and (d) a liquid phase comprising water; wherein the mole ratio of the magnesium oxide to the magnesium salt ranges from 3:1 to 10:1, the level of organo-silicon compound ranges from about 0.5 percent to 10 percent by weight of the magnesium oxide and the water is in an amount effective to cause reaction of at least a portion of said magnesium oxide and at least a portion of said magnesium salt to form a matrix curable to a hardened state A process for forming an article from a curable cementitious composition, comprising: (a) mixing together in the presence of a liquid phase having water sufficient to produce a moldable, curable slurry composition from the components of: (1) magnesium oxide; (2) at least one magnesium salt having moderate solubility in water; and (3) at least one organo-silicon compound, characterized in having attached to the silicon atom (i) at least one group having a hydrolyzable bond with the silicon atom and selected from the group consisting of halogen, hydroxyl, alkoxyl, aryloxyl, substituted aryloxyl, aralkoxyl, substituted aralkoxyl, alkylamino, substituted alkylamino, silylamino, substituted silylamino, mercapto and substituted mercapto and (ii) at least one moiety attached through a substantially non-hydrolyzable silicon-carbon bond, wherein the moiety has a working parameter of solubility, dwp, in the range of about 6.2 to about 8.0 (cal./c.c.)½, with [Figure] wherein: Fi=the molar attraction constant of an individual functional group of said moiety expressed in (cal. c.c.)½per mole, and Vi=the molar volume constant of an individual group of said moiety expressed in c.c. per mole wherein the mole ratio of the magnesium oxide to the magnesium salt ranges from 3:1 to 10:1 and the level of organo-silicon compound ranges from about 0.5 percent to 10 percent by weight of the magnesium oxide (b) placing said slurry composition in a mold form; and (c) allowing said composition to cure sufficiently such that said article may be removed from the mold form without substantially adversely affecting the integrity of the molded article.