Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Patent
1989-07-14
1992-02-18
Michl, Paul R.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
524432, 524433, C09K 1700
Patent
active
050895389
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a composition which is able to prevent effectively the deterioration of ground excavation stabilizing liquid by sea water or cement mixing in and to prevent the putrefaction of the liquid by bacteria, to a composition for excavation stabilizing liquid, and to a method for the ground excavation using these composition.
BACKGROUND ART
In usual ground excavation methods, excavation stabilizing liquid is used, which comprises main components such as inorganic clay and, in some cases, water soluble high polymer, a dispersant such as sodium polyacrylate or sodium hexametaphosphate, and additives such as various types of antiseptics.
In the usual technique, however, the prevention of the deterioration of excavation stabilizing liquid by seawater or cement mixing in or of the putrefaction of the stabilizing liquid composition has been insufficient, leading to the large labor and cost for the ground excavation.
The object of the invention is, in the ground excavation, to provide a composition suited for addition to excavation stabilizing liquid which is able to prevent effectively the deterioration of stabilizing liquid by seawater or cement mixing in and to prevent the putrefaction of the liquid by bacteria, to provide an excavation stabilizing liquid composition, and to provide a method for excavation using these compositions.
DISCLOSURE OF INVENTION
The invention is directed to a composition, which comprises a mono-valent salt (a) of an unsaturated carboxylic acid (co)polymer of a polymerization degree 5,000 or less and a compound (b) selected from a group consisting of 1 a mono-valent aluminate, 2 a Group II or III metal oxide, and 3 a salt of a higher order compound, which is suitable for inclusion in an excavation stabilizing liquid composition. The entire excavation stabilizing liquid composition is comprised of components (a) and (b), inorganic clay (c), and, as necessary, a compound (d) selected from the group consisting of water soluble cellulose derivatives, water soluble starch derivatives, polysaccharides and their derivatives. The invention is also directed to a ground excavation method using said excavation stabilizing liquid composition. The unsaturated carboxylic acid (co)polymer refers to a single polymer and/or copolymer of an unsaturated carboxylic acid monomer.
Examples of unsaturated carboxylic acid (co)polymers of polymerization degree 5,000 or less, include (co)polymers of unsaturated carboxylic acids (unsaturated monocarboxylic acids such as acrylic, methacrylic, or crotonic acids; unsaturated dicarboxylic acid such as fumaric, maleic, or itaconic acid) and of the anhydride (maleic anhydride). Particularly, preferred copolymers are acrylic and methacrylic acid (co)polymer. Suitable mono-valent cations of the polymeric salts include the alkali metals (sodium and potassium), ammonium ion, or amine ions [monoethanol, diethanol, triethanol, or alkyl (C.sub.1 .about.C.sub.4) amine ions], preferably sodium and potassium ions. The neutralization of the polymer degree is usually 50.about.100%, preferably 80.about.100%.
The unsaturated carboxylic acid (co)polymer may be copolymerized with another monomer as necessary, including a hydrophilic monomer such as sulfonic acidic group containing monomer [vinyl-, allyl-, vinyltoluene-, or styrene-sulfonic acid and their mono-valent salt], a hydroxyl group containing monomer [allyl alcohol, hydroxyethyl(meth)acrylate], and amide group containing monomer [(meth)acrylamide, N-methyl(meth)acrylamide, N-hydroxyethyl(meth)acrylamide, N-vinylpyrrolidone], an amino group containing monomer [dimethylaminoethl(meth)acrylate, morpholinoethyl(meth)acrylate, dimethylaminoethylfumarate, 2-vinylpyridine, 4-vinylpyridine, N-vinylpyridine, N-vinylimidazoline], a quaternary ammonium salt containing monomer [N,N,N-trimethyl-N-acryloyloxyethylammonium chloride], a weak hydrophilic monomer such as nitrile group containing monomer [(meth)acrylonitrile], and an ester group containing monomer [vinylacetate]. In the mentioned above,
Iizuka Yoshio
Oothuka Yoshiyuki
Tanaka Satoshi
Yamamoto Manabu
Guarriello John J.
Michl Paul R.
Sanyo Chemical Industries Ltd.
Shimizu Construction Co. Ltd.
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