Compositions: coating or plastic – Coating or plastic compositions – Metal-depositing composition or substrate-sensitizing...
Patent
1985-04-24
1989-08-29
Dixon, Jr., William R.
Compositions: coating or plastic
Coating or plastic compositions
Metal-depositing composition or substrate-sensitizing...
106 92, C04B 2410
Patent
active
048613754
ABSTRACT:
Disclosed is a rust preventive composition for steel reinforcements for concrete, which comprises 100 parts by weight of Portland cement, 0.3 to 3 parts of a hydroxycarboxylic acid, 0.3 to 3 parts of a saccharide, 2 to 10 parts as a solid content of a polymer latex, 0 to 5 parts of an optional additive and 30 to 45 parts of water, all parts being by weight. In this composition, an excellent synergistic effect is attained by the combined use of the hydroxycarboxylic acid and saccharide. That is, hydration is almost completely suppressed in this composition under ordinary rust preventing treatment conditions, but hydration is effectively promoted under high-temperature high-pressure hydrothermal curing conditions. Gluconic acid and sorbitol are especially preferred as the hydroxycarboxylic acid and saccharide, respectively.
REFERENCES:
patent: 3885985 (1975-05-01), Serafin et al.
patent: 4060425 (1977-11-01), Harada et al.
patent: 4088804 (1978-05-01), Cornwell et al.
patent: 4092109 (1978-05-01), Rosenberg et al.
patent: 4286992 (1981-09-01), Galer et al.
Chem. Abs., 89:48049n, "Hydration of a 4CaO.3Al.sub.2 O.sub.3.SO.sub.3 Cement Paste in the Presence of Calcium Hydroxide, Calcium Sulfate Dihydrate and Some Organic Compounds", Collepardi et al., 1976.
Chem. Abs., 92:98119t, "Self Hardening Sand Mold", Kariyone et al., 1979.
Nakano Sota
Tada Shinsaku
Burns Robert E.
Dixon Jr. William R.
Griffith Andrew
Lobato Emmanuel J.
Misawa Home Kabushiki Kaisha
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