GB2181420A - Reinforcing carbon fiber-containing powder raw material for molded item - Google Patents
Reinforcing carbon fiber-containing powder raw material for molded item Download PDFInfo
- Publication number
- GB2181420A GB2181420A GB08525337A GB8525337A GB2181420A GB 2181420 A GB2181420 A GB 2181420A GB 08525337 A GB08525337 A GB 08525337A GB 8525337 A GB8525337 A GB 8525337A GB 2181420 A GB2181420 A GB 2181420A
- Authority
- GB
- United Kingdom
- Prior art keywords
- raw material
- carbon fibers
- fibers
- antiflocculant
- molding raw
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C14/00—Glass compositions containing a non-glass component, e.g. compositions containing fibres, filaments, whiskers, platelets, or the like, dispersed in a glass matrix
- C03C14/002—Glass compositions containing a non-glass component, e.g. compositions containing fibres, filaments, whiskers, platelets, or the like, dispersed in a glass matrix the non-glass component being in the form of fibres, filaments, yarns, felts or woven material
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C14/00—Glass compositions containing a non-glass component, e.g. compositions containing fibres, filaments, whiskers, platelets, or the like, dispersed in a glass matrix
- C03C14/004—Glass compositions containing a non-glass component, e.g. compositions containing fibres, filaments, whiskers, platelets, or the like, dispersed in a glass matrix the non-glass component being in the form of particles or flakes
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/38—Fibrous materials; Whiskers
- C04B14/386—Carbon
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C2214/00—Nature of the non-vitreous component
- C03C2214/02—Fibres; Filaments; Yarns; Felts; Woven material
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C2214/00—Nature of the non-vitreous component
- C03C2214/02—Fibres; Filaments; Yarns; Felts; Woven material
- C03C2214/03—Fibres; Filaments; Yarns; Felts; Woven material surface treated, e.g. coated
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C2214/00—Nature of the non-vitreous component
- C03C2214/04—Particles; Flakes
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/0068—Ingredients with a function or property not provided for elsewhere in C04B2103/00
- C04B2103/008—Flocking or deflocking agents
- C04B2103/0081—Deflocking agents
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Dispersion Chemistry (AREA)
- Geochemistry & Mineralogy (AREA)
- General Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Structural Engineering (AREA)
- Inorganic Chemistry (AREA)
- Nanotechnology (AREA)
- Civil Engineering (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
A molding raw material that contains reinforcing carbon fibers for plastic molded items such as concrete, synthetic resin, glass, and metal molded items. Said reinforcing carbon fibers generally comprise chopped strands having a length of about 3-30 mm and are dispersed substantially uniformly together with an antiflocculant in a powder molding raw material. Said antiflocculant serves to prevent said short carbon fibers in said powder molding raw material from flocculating.
Description
SPECIFICATION
Reinforcing carbon fiber-containing powder raw material for molded item
The present invention relates to a premixed molding raw material that contains reinforcing carbon fibers and more particularly to a premixed raw material that contains reinforcing carbon fibers for plastic molded items for example concrete, synthetic resin, glass and metal molded items.
Carbon fiber is excellent in high mechanical properties as well as fire resistance, heat resistance, water resistance, alkali resistance, etc. and is most suitable as a reinforcing material for plastic molded items, but since carbon fiber is expensive, the range of its application has been limited though it has been used for some high-grade items. However, along with recent improvement in the process for the production of carbon fiber, the price of carbon fiber has decreased, its use in the field of molding has increased rapidly, and the application in cement-based materials has become particularly noted. The reason for that is that carbon fiber can improve substantially the properties of concrete items that are poor in bending strength, tensile strength, impact resistance, etc. to provide new constructional materials.In such an application, a bundle of longer carbon fibers is cut into prescribed lengths, and the resulting short carbon fibers are dispersed uniformly in a molding material. Although glass fiber and steel fiber have been known as reinforcing materials for concrete material, these reinforcing fibers are unsafisfactory with respect to heat resistance and alkali resistance.
There are two methods of mixing reinforcing carbon fiber with a molding material. One of the methods is a dry method wherein reinforcing fiber in the dry state is put into a powder molding raw material, and the mixture is stirred to prepare a premied raw material, and the other is a wet method wherein when a molding material is to be mixed, reinforcing fiber is introduced into the molding material at the same time. The proportion of the reinforcing carbon fiber in the molding raw material will depend on the intended molded item that will be prepared from the molding raw material, but should be down to a certain value. To uniformly disperse reinforcing carbon fibers in a desired proportion into a molding raw material, a very difficult problem will arise even in any of the prior methods.That is, not only the reinforcing carbon fibers are not dispersed by stirring but they are liable to flocculate into a mass. Carbon fibers used are generally 3-30 mm in length, 8-18 microns in diameter, and about 1.2-1.9 in specific gravity, and since they are light in weight relatively and high in resilience, even when they are cut, they are liable to flocculate into small masses. When the cut carbon fibers are dispersed and mixed with a molding raw material, if the proportion of the carbon fibers exceeds 3-5 v6 in terms of a weight ratio, they would flocculate again in the molding raw material.
An apparatus by which masses of short carbon fibers that have been cut and have flocculated are loosened, and the loosened carbon fibers are mixed with a cement-based raw material to produce a premix has been disclosed in Japanese Laid Open Patent No. 58-18760 (1983) that has been proposed by this applicant and laid-open on 24, Oct. 1983. In this apparatus, a pair of rolls each having a number of needle members are driven in opposite directions at different rotational speeds, small masses of short carbon fibers are fed between the rolls to separate the masses into separate short carbon fibers, and then the short carbon fibers are stirred together with a concrete raw material containing cement in the dry state.However, in this apparatus, when the proportion of the carbon fibers exceeds a certain value, it is disadvantageously inevitable that the carbon fibers reflocculate in the concrete raw material as stated above, and therefore a premixed molding raw material containing a desired amount of short carbon fibers can not be given.
The object of the present invention is to provide a premixed raw material composition in powdery form for molded items, which raw material contains reinforcing short carbon fibers substantially uniformly dispersed therein.
According to one aspect of the present invention, there is provided a premixed molding raw material comprising an antiflocculant and a pulverulent molding raw material with carbon fibers substantially unformly dispersed therein, said antiflocculant comprising particles substantially thinner and finer than said carbon fibers and serving to intervene between said carbon fibers to prevent said carbon fibers from intertwining.
According to a desirable embodiment of the present invention, as the antiflocculant particles can be used ultra-short fibers other than carbon fibers, such as glass fibers, asbestos, polyvinylidene chloride fibers, or whiskers of alumina or graphite and in stead of such ultra-short fibers, or together with such ultra-short fibers, particles such as ferrosilicon dust, kaolin clay, calcium carbonate, mica calcined clay, finely divided silicic acid anhydride, barite, magnesite and the like that have effects similar to those of such ultra-short fibers also can be used.
Although the premixed molding raw material of the present invention can be most suitably applied to cement-based materials such as concrete, the application is not limited to cementbased materials, but the present premixed molding raw material can also be applied to plastic molding raw materials such as synthetic resins, glass, metals, etc., since the tendencies of the flocculation of short carbon fibers in these molding raw materials are almost the same in spite of different properties of these molding raw materials.
FIGURE illustrates schematically a concrete item produced by using a premixed molding raw material prepared in accordance with the present invention.
Referring to FIGURE, in the concrete item produced by using a premixed molding raw material prepared in accordance with the present invention, a number of short carbon fibers 1 are uniformly dispersed in the molding raw material consisting of cement particles 4 and inorganic aggregates 5. The uniform dispersion of the short carbon fibers 1 is maintained by antiflocculants 2 and 3 present between the short carbon fibers 1. In this embodiment, the antiflocculants consist of ultra-short fibers 2 and particles 3, which are substantially thinner and have smaller volumes relative to short carbon fibers 1.Desired examples of a premixed molding raw material are as follows:
Example 1
Carbon short fiber (3 mm in length) 20% by weight
Cement 67% by weight
Fine particles
(ferrosilicon dust: 0.1 8 in particle size) 10% by weight
Finely thin short fiber
(wollastonite: 2 Cr in diameter) 3% by weight
Example 2
Carbon short fiber (10 mm in length) 15% by weight
Cement 78% by weight
Fine particles
(kaolin clay: 58 in particle size) 5% by weight
Finely thin short fiber
(alumina whisker: 4,u in diameter) 2% by weight
The present invention is not be limited to the compositions of the above Examples, and as finely thin short fibers can be used glass fibers, asbestos, polyvinylidene chloride fibers, graphite whiskers, etc. and as fine particles can be used particles of calcium carbonate, mica calcined clay, finely divided silicic acid anhydride, barite, magnesite, etc.
A desirable method of producing a premixed molding raw material containing an antiflocculant together with short carbon fibers as described before includes mixing the short carbon fibers with the antiflocculant, and then stirring the resulting mixture together with the molding raw material. However, altenatively, one of short carbon fibers and an antiflocculant can be mixed previously with a molding raw material, and then the other can be mixed with the resulting mixture.
According to the present invention, a premixed molding raw material wherein by proportion of the short carbon fibers is as high as 15-20% by weight can be provided, and in spite of such a higher proportion of the carbon short fibers, the short carbon fibers would not flocculate during the transportation of the premixed molding raw material. The premixed molding raw material provided by the present invention can be kneaded in the same manner as for the prior raw molding material, and even in this case the reinforcing carbon fibers would not flocculate again.
According to a further aspect of the invention there is provided a premixed cement material containing a cement powder, short carbon fibers dispersed unformly in said cement powder, and an antiflocculant, said antiflocculant comprising short fibers selected from a first group consisting of glass fibers, asbestos, polyvinylidene chloride fibers, graphite whiskers, alumina whiskers, and wollastonite, and particles selected from a second group consisting of ferrosilicon dust, kaolin clay, calcium carbonate, mica calcined clay, finely divided silicic acid anhydride, barite, and magnesite.
According to a still further aspect of the invention there are provided molding articles whenever formed from the premixed molding raw materials of the invention.
Claims (8)
1. A premixed molding raw material comprising an antiflocculant and a pulverulent molding raw material having carbon fibers substantially uniformly dispersed therein, said antiflocculant comprising particles substantially thinner and finer than said carbon fibers and serving to intervene between said carbon fibers to prevent said carbon fibers from intertwining.
2. A premixed molding raw material as claimed in claim 1, wherein said antiflocculant particles comprise ultra-short fibers other than carbon fibers.
3. A premixed molding raw material as claimed in claim 2, wherein said ultra-short fibers are selected from a group consisting of glass fibers, asbestos, polyvinylidene chloride fibers, graph ite whiskers, alumina whiskers, and wollastonite.
4. A premixed molding raw material as claimed in any one of claims 1 to 3 wherein said antiflocculant particles comprise particles selected from a group consisting of ferrosilicon dust, kaolin clay, calcium carbonate, mica calcined clay, finely divided silicic acid anhydride powder, barite and magnesite.
5. A premixed cement material containing a cement powder, short carbon fibers dispersed uniformly in said cement powder, and an antiflocculant, said antiflocculant comprising short fibers selected from a first group consisting of glass fibers, asbestos, polyvinylidene chloride fibers, graphite whiskers, alumina whiskers, and wollastonite, and particles selected from a second group consisting of ferrosilicon dust, kaolin clay, calcium carbonate, mica calcined clay, finely divided silicic acid anhydride, barite and magnesite.
6. A premixed material as claimed in any one of the preceding claims containing up to 20% by weight of short carbon fibers.
7. Particulate-antiflocculant containing molding raw materials substantially as herein described.
8. Molded articles whenever formed from materials as claimed in any one of the preceding claims.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7290584A JPS60221350A (en) | 1984-04-13 | 1984-04-13 | Variety of powdery raw materials containing carbon short fiber |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB8525337D0 GB8525337D0 (en) | 1985-11-20 |
| GB2181420A true GB2181420A (en) | 1987-04-23 |
| GB2181420B GB2181420B (en) | 1989-09-27 |
Family
ID=13502829
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8525337A Expired GB2181420B (en) | 1984-04-13 | 1985-10-15 | Reinforcing carbon fiber-containing powder raw material for molded item |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JPS60221350A (en) |
| GB (1) | GB2181420B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0343301A3 (en) * | 1988-05-23 | 1990-03-21 | Corning Glass Works | Hybrid ceramic matrix composite articles comprising particulate additives and method |
| EP0648716A1 (en) * | 1993-10-13 | 1995-04-19 | Mitsubishi Chemical Corporation | Chopped strands of carbon fibers and reinforced hydraulic composite materials |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62202847A (en) * | 1986-02-28 | 1987-09-07 | 大成建設株式会社 | Method of strengthening adhesion power of fiber composite material |
| JPS62226850A (en) * | 1986-03-27 | 1987-10-05 | 大成建設株式会社 | Unhardened composition and method for producing the same |
| JPH0735274B2 (en) * | 1986-11-11 | 1995-04-19 | 株式会社入江壁材 | Dry short carbon fiber raw material with anti-agglomeration treatment and method for producing the same |
| JPH0617255B2 (en) * | 1987-08-05 | 1994-03-09 | 大成建設株式会社 | Manufacturing method of fiber reinforced cement mortar |
| JPH0733493A (en) * | 1993-07-14 | 1995-02-03 | Kunio Hasegawa | Production of concrete plate |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1386136A (en) * | 1971-11-26 | 1975-03-05 | Battelle Development Corp | Concrete structural member |
| GB2035378A (en) * | 1978-09-27 | 1980-06-18 | Sumitomo Chemical Co | Process for fabricating fibre-reinforced metal composite |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5933105A (en) * | 1982-08-20 | 1984-02-22 | 株式会社入江壁材 | Method of uniformly mixing carbon short fiber into cement group raw material and cement group raw material containing carbon short fiber |
-
1984
- 1984-04-13 JP JP7290584A patent/JPS60221350A/en active Granted
-
1985
- 1985-10-15 GB GB8525337A patent/GB2181420B/en not_active Expired
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1386136A (en) * | 1971-11-26 | 1975-03-05 | Battelle Development Corp | Concrete structural member |
| GB2035378A (en) * | 1978-09-27 | 1980-06-18 | Sumitomo Chemical Co | Process for fabricating fibre-reinforced metal composite |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0343301A3 (en) * | 1988-05-23 | 1990-03-21 | Corning Glass Works | Hybrid ceramic matrix composite articles comprising particulate additives and method |
| EP0648716A1 (en) * | 1993-10-13 | 1995-04-19 | Mitsubishi Chemical Corporation | Chopped strands of carbon fibers and reinforced hydraulic composite materials |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2181420B (en) | 1989-09-27 |
| GB8525337D0 (en) | 1985-11-20 |
| JPH0364462B2 (en) | 1991-10-07 |
| JPS60221350A (en) | 1985-11-06 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19921015 |