Compositions – Preservative agents – Anti-corrosion
Patent
1989-08-16
1991-09-24
Kyle, Deborah L.
Compositions
Preservative agents
Anti-corrosion
25238952, 2523891, 502 1, 106 1441, 106 1405, C23F 1100
Patent
active
050512072
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a heat-resistant, corrosion-resistant composition. More particularly, the present invention relates to a heat-resistant, corrosion-resistant composition which is excellent in such properties as heat resistance, thermal shock resistance, oxidation resistance and non-corrosiveness against a metal and which may be used as a coating material and a binder for ceramics.
BACKGROUND ART
Composition or paints disclosed in Japanese Patent Laid-Open No. (sho.) 54-123146 or No. (sho.) 62-54768 are known as conventional coating compositions. For example, the paint or coating material disclosed in the Japanese Patent Laid-Open No. (sho.) 62-54768 comprises polymethylcarbosilane, a silicone resin, an inorganic filler and an organic solvent, but this coating material is defective in that the hardness and strength in its cured state are poor, the heat resistance and corrosion resistance in its cured state are insufficient and the temperature for curing it is high (at least 250.degree. C.).
Furthermore, conventional binders for ceramics are not excellent in heat resistance, and they will partly remain unchanged even after sintering thereof thereby to make no contribution to the improvement of the ceramics in strength and shock resistance. Accordingly, conventional ceramic moldings require a high-temperature high-pressure baking technique as adopted in the hot-press process to be produced, but they raise problems as to being readily broken by thermal stress.
DISCLOSURE OF THE INVENTION
In view of the above-mentioned problems, the primary object of the present invention is to provide a composition which is excellent in such properties as heat resistance, thermal shock resistance, oxidation resistance and non-corrosiveness against a metal and which is used as a coating material or a binder for ceramics.
In accordance with the present invention, there is provided a heat-resistant, corrosion-resistant composition comprising a metal alcoholate, a curing agent, a filler and an organic solvent.
The metal alcoholate used in the present invention has the following general formula (I) or (II): degree of polymerization 5-50, and a metal alcoholate of formula (I), wherein M is Zr, Al, Si or Ti, R is alkyl, phenyl or hydrogen, l is 3 or 4.
Inorganic compounds capable of being dehydrated by heating and thermosetting resins are used as the curing agent. The inorganic compounds capable of being dehydrated by heating, referred to herein, are those which can be dehydrated by heating. More specifically, they include boron hydroxide, titanium hydroxide, aluminum hydroxide, zinc hydroxide, yttrium hydroxide, chromium hydroxide, silicon hydroxide, germanium hydroxide, cobalt hydroxide, zirconium hydroxide, tin hydroxide, iron hydroxide, copper hydroxide, lead hydroxide, nickel hydroxide, magnesium hydroxide, manganese hydroxide, molybdenum hydroxide and lanthanum hydroxide. The thermosetting resins, include phenolic resins, methylol urea resins and methylol melamine resins.
The fillers used in the present invention, include powders of ceramics such as .alpha.-SiC, .beta.-SiC obtained by molding, insolubilizing and heat-treating a polycarbosilane having a number average molecular weight of 400 to 5000, silicon nitride and alumina. The average particle size of the powder is 0.1 to 1000.mu., preferably 0.1 to 10.mu. for coating materials and preferably 0.1 to 1000.mu. for binders for ceramics.
The organic solvents include general-purpose solvents such as xylene, toluene, benzene and hexane. It is preferred that the mixing ratio of the foregoing components of the composition of this invention be such that the amounts of the metal alcoholate, the curing agent and the filler are 25 to 80% by weight, 0.1 to 20% by weight and 10 to 70% by weight, respectively, based on 100% by weight of the total solids. It is preferred that the solvent be incorporated in an amount of 10 to 60 parts by weight per 100 parts by weight of the total solids.
More specifically, for coating materials, it is preferred that
REFERENCES:
patent: 4359559 (1982-11-01), Yajima et al.
patent: 4608420 (1986-08-01), Brindopke et al.
patent: 4681860 (1987-07-01), Bujalski
patent: 4808659 (1989-02-01), Nishihara et al.
patent: 4837230 (1989-06-01), Chen et al.
patent: 4840666 (1989-06-01), Schmidt et al.
Testing Methods for Organic Coatings, JIS K 5400, published by Japanese Standards Association, 1979.
JP Abstract No. 62-54768, Nishihara, Yoshio, "Heat Resistant Paint".
JP Abstract No. 63-12672, Nishihara, Yoshio, "Coating Composition".
Ichikawa Hiroshi
Ishikawa Toshikatsu
Mitsuno Shiro
Nagai Hideto
Tokutomi Katsuya
Fee Valerie
Kyle Deborah L.
Nippon Oil Co. Ltd.
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