Stock material or miscellaneous articles – Coated or structually defined flake – particle – cell – strand,... – Staple length fiber
Patent
1993-03-08
1995-06-13
Cannon, James C.
Stock material or miscellaneous articles
Coated or structually defined flake, particle, cell, strand,...
Staple length fiber
427553, 427558, 427598, 427212, 427215, 428378, 428689, 428697, 428703, 501 95, 501141, C04B 1438, C04B 1606, C04B 2010
Patent
active
054241243
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a civil engineering and construction grade fibrous reinforcing material as a substitute for asbestos, a method for the production of the fibrous reinforcing material, and civil engineering and construction materials containing the fibrous reinforcing material.
BACKGROUND ART
Asbestos has found extensive utility in the field of construction. Asbestos excels in weatherability and refractoriness and has enough formability to permit easy production of various shaped articles for a wide variety of applications.
However, it has been ascertained that the asbestos is a factor injurious to health. Thus, the use of this material has come to be substantially banned.
In the circumstances, there is a strong desire for the supply of a substitute with properties like those of asbestos at a low price.
The following materials are known as substitutes for asbestos.
Materials intended to effect reinforcement of building materials: polypropylene, polyethylene, carbon, Aramides, rayon, and phenol. whiskers such as of potassium titanate, and ceramic fibers such as of alumina, alumina silica, and silica. attapulgite.
Materials intended to improve building materials in formability: fibrillation products thereof. polypropylene.
Materials intended to improve building materials in strength:
Materials intended to increase volume:
Typical Japanese Patent Public Disclosures covering these materials are shown below.
Japanese Patent Public Disclosure No. 174343/1991 discloses a composition which comprises whiskers (such as of carbon, silicon carbide, silicon nitride, alumina, and potassium titanate) and an aggregate of particles having an average diameter not more than two times the diameter of the whiskers.
Japanese Patent Public Disclosure No. 114802/1991 discloses a method which comprises molding diatomaceous earth in the form of scales, converting the scales into pellets not more than 6 mm in diameter or rolling them to a thickness not more than 4 mm, mixing the resultant particles with portland cement and/or lime, fibers, and an extrusion auxiliary, adjusting the water content of the resultant mixture, and molding the mixture in a stated shape. It further discloses as fibers for use in the method described above inorganic substances such as asbestos, glass fibers, carbon fibers, and wollastonite, and pulp, polypropylene, polyvinyl alcohol, Kepler, and polyethylene fibers.
Japanese Patent Public Disclosure No. 141140/1991 discloses a composition which comprises polyvinyl alcohol type fibers or polyamide fibers and a synthetic pulp, wherein a study of the amounts and ratios of these components relative to the total amount of the composition enabled the composition to acquire improved ability of filtration as determined by a test for filtrability to water. It further discloses additives (such as, for example, mica, wollastonite, slag, silica, bentonite, and pearlite).
Japanese Patent Public Disclosure No. 54950/1985 discloses that the product obtained by preliminarily imparting minute grooves and ridges to the surfaces of fibers and subjecting the fibers to electroless plating thereby depositing such metal as Au, Ag, Cu, Ni, Co, Pd, or Sn on the fibers is used as a cement type reinforcing material.
The product resulting from the treatment just mentioned is expensive and entails both the step for imparting a rough surface and the step for plating.
Japanese Patent Public Disclosure No. 74546/1990 discloses that asbestos-free SiO.sub.2 --MgO--CaO--Al.sub.2 O.sub.3 type mineral fibers are produced by extrusion molding a mixture of cement, a siliceous raw material, and an extrusion auxiliary and that these fibers have a length of not more than 1 mm.
Japanese Patent Public Disclosure No. 69205/1990 discloses that the product obtained by preparing a composition of cement and silica, combining this composition with 8 to 13% of natural fibers of wollastonite or zeolite, and mixing the resultant blend with necessary additives, not including asbestos, is practically used.
Various known methods have be
REFERENCES:
patent: 5024859 (1991-06-01), Millard et al.
Kashiwagi Shoji
Kurozumi Tadatoshi
Yoshikawa Kazuo
Cannon James C.
Showa Denko K.K.
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