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AssigneeKowa Chemical Industry Ltd.
InventorsKiyoshi Kikuchi, Takeo Okano, Yukio Terakawa, Akira Nishihara
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A novel stable silica sol which does not gel even at low temperatures is prepared by adding a di -or polyhydric alcohol having three or more carbon atoms and a water-soluble melamine resin to a silica sol. A novel water-based coating composition which requires only an applying step, not a baking step nor a drying step, in the use is prepared by adding an aggregate or filler and usual additives for coating material to the aforesaid stable silica sol as binder. By adding further a small amount of a synthetic resin emulsion to said binder, an inorganic coating composition containing a smaller amount of organic materials than that in prior products can be obtained. The coating therefrom is excellent in strength and its fire resistance is not lowered.
Method for producing an inorganic coating composition which comprises forming a binder component consisting of a stable silica sol and incorporating said binder into said inorganic coating composition, said stable silica sol being prepared by adding at least one dihydric long chain alcohol having 3 or more carbon atoms to a silica sol, and adding a water-soluble melamine resin to the resultant sol.
An inorganic coating composition consisting essentially of a stable silica sol, as binder, which is prepared by adding at least one dihydric long chain alcohol having at least 3 carbon atoms, a small amount of a water-soluble melamine resin and an acrylic resin emulsion, to a silica sol having a silica content of about 30% by weight;
Method for preparing a stable silica sol which comprises providing 100 parts by weight of a silica sol having a silica content of about 30% by weight, adding thereto at least one dihydric long chain alcohol having at least 3 carbon atoms in a quantity of at least 5 parts by weight, and further adding a water-soluble melamine resin in a quantity of at least 2 parts by weight to the resulted sol.
Method for preparing a stable silica sol which comprises providing 100 parts by weight of a silica sol having a silica content of about 30% by weight, adding thereto at least one dihydric long chain alcohol having at least 3 carbon atoms in a quantity of at least 5 parts by weight, and further adding a water-soluble melamine resin in a quantity of at least 2 parts by weight, together with an acrylic resin emulsion having a resin content of about 30% by weight in a quantity of 10-35 parts by weight, to the resultant sol.
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