CN101890758A - Method for drying and dispersing carbon fibers in cement powder - Google Patents
Method for drying and dispersing carbon fibers in cement powder Download PDFInfo
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- CN101890758A CN101890758A CN 201010224017 CN201010224017A CN101890758A CN 101890758 A CN101890758 A CN 101890758A CN 201010224017 CN201010224017 CN 201010224017 CN 201010224017 A CN201010224017 A CN 201010224017A CN 101890758 A CN101890758 A CN 101890758A
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- carbon fiber
- chopped carbon
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- 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
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- 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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/10—Coating or impregnating
- C04B20/1018—Coating or impregnating with organic materials
- C04B20/1022—Non-macromolecular compounds
-
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00612—Uses not provided for elsewhere in C04B2111/00 as one or more layers of a layered structure
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- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
Abstract
The invention provides a method for drying and dispersing carbon fibers in cement powder, which comprises the following steps of: firstly, soaking chopped carbon fibers into absolute ethyl alcohol to remove a colloid on the surface and drying; secondly, after dispersing the chopped carbon fibers in a high-speed mixer to form filaments, equally dividing the filaments into a plurality of parts based on mass, and equally dividing portland cement into a plurality of parts based on the mass at the same time; thirdly, spreading the filaments obtained by dispersing the chopped carbon fibers and the portland cement in an agitating pan of an agitator in an alternative mode; fourthly, starting the agitator to stir for 1 to 3 minutes at a rotating speed of 140r/min and then stir for 10 to 20 minutes at a rotating speed of 285r/min; and finally, adding water into the agitating pan for stirring and molding to prepare a carbon fiber cement-based composite material. The carbon fiber cement-based composite material prepared by the dispersion method of the invention has the advantages of uniformly distributed carbon fibers and no fiber agglomeration phenomenon.
Description
[technical field]
The present invention relates to a kind of process for dispersing of carbon fiber, particularly a kind of under drying regime, the method for drying and dispersing of carbon fiber in cement powder.
[background technology]
The hydrophobic property of carbon current fiber surface and filament diameter thereof only are that the fibrous geometry about 7 μ m is still the main cause that causes carbon fiber skewness and carbon-fiber cement based composites preparation failure in cement matrix, and it is having a strong impact on the performance of carbon-fiber cement based composites comprehensive mechanical property and the stability of electric property thereof.
Therefore, carbon fiber is carried out pre-dispersed processing, to avoid under the effect of mechanical agitation power carbon fiber in cement mixture, to be agglomerated into piece, and the comprehensive mechanical property and the electrical performance stability that improve the carbon-fiber cement based composites, become one of key content of current carbon-fiber cement based composites preparing technical field research.
Document 1 (" D.D.L.Chung; Carbon; 2000; 31: 511-526 ") and document 2 (" B.G Han; X.C.Guan; J.P.Ou, Sensors andActuators A, 2007,135: 360-369 ") a kind of method of utilizing methylcellulose and silicon ash acting in conjunction dispersed carbon fiber being disclosed; is specially: at first with carbon fiber; methylcellulose; water reducer; defoamer; and water mix in mixer is even, and then add silicon ash and cement and further stirring, thereby, form the cement mixture that carbon fiber is evenly distributed, at last cast, maintenance forms the carbon-fiber cement based composites.
Document 3 (" C.Wang; K.Z.Li; H.J.Li; GS.Jiao; J.H.Lu; D.S.Hou, Materials Science and Engineering A, 2008,487: 52-57 ") disclose a kind of method of utilizing ultrasonic wave, hydroxyethylcellulose and silicon ash acting in conjunction dispersed carbon fiber, be specially: at first carbon fiber is immersed in the water; and added hydroxyethylcellulose and small amounts of phosphoric acid tributyl; sonic oscillation to carbon fiber has been uniformly dispersed, and then after stirring with cement, normal sand, silicon ash and water reducer, formed the carbon-fiber cement based composites.
Though said method can obtain carbon fiber dispersion effect preferably, but but there are other drawbacks: on the one hand, because methylcellulose that dispersion process is used or hydroxyethylcellulose can cause carbon-fiber cement mixture viscosity to increase, causing to obtaining necessary cast flowability increases the mixing water amount, reduces final composite material strength; On the other hand, methylcellulose and hydroxyethylcellulose also can remain in the carbon-fiber cement based composites, at the one deck of formation at the interface insulation macromolecule layer of carbon fiber and cement stone, increase the fluctuation range of final composite material resistance rate, influence the composite electrical performance stability.
Document 4 (" Yang Yuanxia; hair plays Shi; Shen Darong; Li Zhuoqiu; construction material journal, 2001,4 (1): 84-88 ") discloses a kind of with mixing the method that legal system is equipped with the carbon-fiber cement based composites, be specially: directly will carbon fiber and cement powder is dry adds water again after stirring, avoided cellulose to use the composite material strength that brings to reduce and the problem of electric property variation.But the stirring action of mixer can't be uniformly dispersed tiny carbon fiber, and mixing time is long, aggravates the agglomerating of carbon fiber and fractures; On the other hand, because that carbon fiber disperses is inhomogeneous, therefore, prepared carbon-fiber cement based composites resistivity fluctuation of coming out is bigger.
Document 5 (" Hai Ran; Pan Hongke; Zhongyuan Technical Faculty journal; 2008; 19 (3): 1-3+12 ") discloses a kind of manual method of rubbing technology dispersed carbon fiber that adopts, be specially: at first carbon fiber and silica flour are mixed the back and carry out craft and rub, then with the mixture and the cement of carbon fiber and silica flour, remain silica flour and water reducer stirs in mixer, add normal sand and water more successively and prepare the carbon-fiber cement based composites.This method can not used under the cellulosic dry stirring, obtain carbon fiber dispersion effect preferably, and the composite material strength of having avoided cellulose to use bringing reduces and the problem of electric property variation.It is lower that but the carbon fiber dispersion efficiency of technology is rubbed in the craft that this method adopts, and operating personnel's working environment is relatively poor, and process hand-manipulated causes carbon-fiber cement based composites performance inconsistency bigger easily.
[summary of the invention]
Technical problem to be solved by this invention provides the method for drying and dispersing of a kind of carbon fiber in cement powder, and wherein, carbon fiber is evenly distributed in cement powder, and does not have the fiber agglomeration to take place.
For achieving the above object, the invention provides the method for drying and dispersing of a kind of carbon fiber in cement powder, at first, chopped carbon fiber is soaked in absolute ethyl alcohol, remove surperficial colloid and dry; Then, chopped carbon fiber is separated into the monofilament state in homogenizer after, it is divided into some five equilibriums according to quality, simultaneously, portland cement is divided into some five equilibriums according to quality; Follow again, be tiled in chopped carbon fiber and the portland cement that is separated into the monofilament state in the agitated kettle of mixer in the mode that replaces; At last, start mixer, make its rotating speed stir 1～3min with 140r/min after, the rotating speed with 285r/min stirs 10～20min again, afterwards, gets final product to wherein adding the entry type of stirring into.
The method for drying and dispersing of carbon fiber of the present invention in cement powder has the following advantages at least: owing to adopted dry mixed technology, directly with the chopped carbon fiber of monofilament state and cement powder dry mixed evenly after, add water again and be prepared into the carbon-fiber cement based composites, thereby the composite material strength of having avoided cellulose to use bringing reduces and the problem of electric property variation; In addition, the homogenizer that technology utilization of the present invention has the intersection elastomer blade is separated into the monofilament state with the pencil chopped carbon fiber, help the even dispersion of follow-up carbon fiber in cement powder, the carbon fiber diameter of monofilament state is thin simultaneously, the surface can be higher, help the absorption of cement powder, can effectively avoid the secondary agglomeration of monofilament state carbon fiber at carbon fiber surface; Moreover technical process of the present invention does not need to adopt manual rubbing to operate the dispersed carbon fiber, thereby can obviously improve operating personnel's working environment, raises the efficiency, and helps the stable performance of carbon-fiber cement based composites.
[description of drawings]
Fig. 1 is the flow chart of the method for drying and dispersing of carbon fiber of the present invention in cement powder;
Fig. 2 is the stereoscan photograph in carbon-fiber cement based composites obtained by the method for the present invention cross section.
[specific embodiment]
[embodiment one]:
Step 1: seeing also shown in Figure 1ly, is 0.001: 1: 0.3 ratio according to mass ratio, gets chopped carbon fiber, Portland cement and water;
Step 2: chopped carbon fiber is soaked 6h in absolute ethyl alcohol, remove surperficial colloid, dry then, place again and stir 1min in the homogenizer with intersection elastomer blade, wherein, the rotating speed of mixer is 8000r/min, so that the pencil chopped carbon fiber is separated into the monofilament state;
Step 3: the chopped carbon fiber of the monofilament state that step 2 is obtained is divided into 3 parts by quality, and is stand-by; Simultaneously,, be divided into 4 parts by quality with Portland cement, stand-by;
Step 4: get 1 part of Portland cement and pack in the agitated kettle of glue sand agitator, and maintenance cement powder surfacing, the chopped carbon fiber of getting 1 part of monofilament state then evenly is covered on the cement powder surface, repeat above-mentioned steps, Portland cement and chopped carbon fiber are alternately placed, promptly at one deck Portland cement surface tiling one deck chopped carbon fiber, then, again at one deck chopped carbon fiber surface tiling one deck Portland cement, so repeat, till Portland cement and chopped carbon fiber exhausted, last, the last layer of the agitated kettle of glue sand agitator was a cement powder;
Step 5: connect power supply, the glue sand agitator stirs 1min with the rotating speed of 140r/min, then, rotating speed with 285r/min stirs 10min again, at this moment, the carbon fiber monofilament is dispersed among the cement powder, and cement powder evenly is adsorbed in the carbon fiber monofilament surface;
Step 6: water is slowly added in the mixed material of carbon fiber that step 5 obtains and cement powder, then, after making the glue sand agitator stir 1min with the rotating speed continuation of 285r/min, directly be poured in the steel mould and vibration moulding, last maintenance forms the carbon-fiber cement based composites.
[embodiment two]
Step 1: seeing also shown in Figure 1ly, is 0.004: 1: 0.4 ratio according to mass ratio, gets chopped carbon fiber, Portland cement and water;
Step 2: chopped carbon fiber is soaked 8h in absolute ethyl alcohol, remove surperficial colloid, dry then, place again and stir 1min in the homogenizer with intersection elastomer blade, wherein, the rotating speed of mixer is 9000r/min, is separated into the monofilament state with the chopped carbon fiber with pencil;
Step 3: the chopped carbon fiber that step 2 is dispersed into the monofilament state is divided into 4 parts by quality, and is stand-by; Simultaneously,, be divided into 5 parts by quality with Portland cement, stand-by;
Step 4: get 1 part of Portland cement and pack in the agitated kettle of glue sand agitator, and maintenance cement powder surfacing, the chopped carbon fiber of getting 1 part of monofilament state then evenly is covered on the cement powder surface, repeat above-mentioned steps, Portland cement and chopped carbon fiber are alternately placed, promptly at one deck Portland cement surface tiling one deck chopped carbon fiber, then, again at one deck chopped carbon fiber surface tiling one deck Portland cement, so repeat, till Portland cement and chopped carbon fiber exhausted, last, the last layer of the agitated kettle of glue sand agitator was a cement powder;
Step 5: connect power supply, the glue sand agitator stirs 2min with the rotating speed of 140r/min, then, rotating speed with 285r/min stirs 15min again, at this moment, the carbon fiber monofilament is dispersed among the cement powder, and cement powder evenly is adsorbed in the carbon fiber monofilament surface;
Step 6: water is slowly added in the mixed material of carbon fiber that step 5 obtains and cement powder, then, the glue sand agitator directly is poured in the steel mould and vibration moulding after stirring 1min with the rotating speed continuation of 285r/min, and last maintenance forms the carbon-fiber cement based composites.
[embodiment three]
Step 1: seeing also shown in Figure 1ly, is 0.006: 1: 0.5 ratio according to mass ratio, gets chopped carbon fiber, Portland cement and water;
Step 2: chopped carbon fiber is soaked 10h in absolute ethyl alcohol, remove surperficial colloid, dry then, place again and stir 1min in the homogenizer with intersection elastomer blade, wherein, the rotating speed of mixer is 9500r/min, is separated into the monofilament state with the chopped carbon fiber with pencil;
Step 3: the chopped carbon fiber that step 2 is dispersed into the monofilament state is divided into 4 parts by quality, and is stand-by; Simultaneously,, be divided into 5 parts by quality with Portland cement, stand-by;
Step 4: get 1 part of Portland cement and pack in the agitated kettle of glue sand agitator, and maintenance cement powder surfacing, the chopped carbon fiber of getting 1 part of monofilament state then evenly is covered on the cement powder surface, repeat above-mentioned steps, Portland cement and chopped carbon fiber are alternately placed, promptly at one deck Portland cement surface tiling one deck chopped carbon fiber, then, again at one deck chopped carbon fiber surface tiling one deck Portland cement, so repeat, till Portland cement and chopped carbon fiber exhausted, last, the last layer of the agitated kettle of glue sand agitator was a cement powder;
Step 5: connect power supply, the glue sand agitator stirs 2min with the rotating speed of 140r/min, then, rotating speed with 285r/min stirs 15min again, at this moment, the carbon fiber monofilament is dispersed among the cement powder, and cement powder evenly is adsorbed in the carbon fiber monofilament surface;
Step 6: water is slowly added in the mixed material of carbon fiber that step 5 obtains and cement powder, then, the glue sand agitator directly is poured in the steel mould and vibration moulding after stirring 2min with the rotating speed continuation of 285r/min, and last maintenance forms the carbon-fiber cement based composites.
[embodiment four]
Step 1: seeing also shown in Figure 1ly, is 0.008: 1: 0.6 ratio according to mass ratio, gets chopped carbon fiber, Portland cement and water;
Step 2: chopped carbon fiber is soaked 12h in absolute ethyl alcohol, remove surperficial colloid, dry then, place again and stir 1min in the homogenizer with intersection elastomer blade, wherein, the rotating speed of mixer is 10000r/min, is separated into the monofilament state with the chopped carbon fiber with pencil;
Step 3: the chopped carbon fiber that step 2 is dispersed into the monofilament state is divided into 5 parts by quality, and is stand-by; Simultaneously,, be divided into 6 parts by quality with Portland cement, stand-by;
Step 4: get 1 part of Portland cement and pack in the agitated kettle of glue sand agitator, and maintenance cement powder surfacing, the chopped carbon fiber of getting 1 part of monofilament state then evenly is covered on the cement powder surface, repeat above-mentioned steps, Portland cement and chopped carbon fiber are alternately placed, promptly at one deck Portland cement surface tiling one deck chopped carbon fiber, then, again at one deck chopped carbon fiber surface tiling one deck Portland cement, so repeat, till Portland cement and chopped carbon fiber exhausted, last, the last layer of the agitated kettle of glue sand agitator was a cement powder;
Step 5: connect power supply, the glue sand agitator stirs 3min with the rotating speed of 140r/min, then, rotating speed with 285r/min stirs 20min again, at this moment, the carbon fiber monofilament is dispersed among the cement powder, and cement powder evenly is adsorbed in the carbon fiber monofilament surface;
Step 6: water is slowly added in the mixed material of carbon fiber that step 5 obtains and cement powder, then, the glue sand agitator directly is poured in the steel mould and vibration moulding after stirring 2min with the rotating speed continuation of 285r/min, and last maintenance forms the carbon-fiber cement based composites.
See also shown in Figure 2ly, by a process for preparing the carbon-fiber cement based composites that comes, carbon fiber is evenly distributed, and does not have the fiber agglomeration to take place.
The above only is one embodiment of the present invention, it or not whole or unique embodiment, the conversion of any equivalence that those of ordinary skills take technical solution of the present invention by reading specification of the present invention is claim of the present invention and contains.
Claims (4)
1. the method for drying and dispersing of a carbon fiber in cement powder is characterized in that: at first, chopped carbon fiber is soaked in absolute ethyl alcohol, remove surperficial colloid and dry; Then, chopped carbon fiber is separated into the monofilament state in mixer after, it is divided into some five equilibriums according to quality, simultaneously, portland cement is divided into some five equilibriums according to quality; Then, be tiled in chopped carbon fiber and the portland cement that is separated into the monofilament state in the agitated kettle of mixer in the mode that replaces; At last, start mixer, make its rotating speed stir 1～3min with 140r/min after, the rotating speed with 285r/min stirs 10～20min again, afterwards, gets final product to wherein adding the entry type of stirring into.
2. method for drying and dispersing as claimed in claim 1 is characterized in that: may further comprise the steps:
Step 1: according to mass ratio is (0.001～0.008): 1: the ratio of (0.3～0.6), get chopped carbon fiber, portland cement and water;
Step 2: chopped carbon fiber is soaked (6～12) h in absolute ethyl alcohol, after removing surperficial colloid, drying, this chopped carbon fiber is positioned over is separated into the monofilament state in the mixer, wherein the rotating speed of mixer is 8000～10000r/min, and mixing time is 1min;
Step 3: the chopped carbon fiber of the monofilament state that step 2 is obtained is divided into some parts by quality, and is stand-by; Simultaneously,, be divided into some parts by quality with portland cement, stand-by;
Step 4: get 1 part of portland cement and pack in the agitated kettle of mixer, and maintenance cement powder surfacing, then, cover the chopped carbon fiber of one deck monofilament state in its surface, repeat above-mentioned steps, till portland cement and chopped carbon fiber exhausted, last, the last layer of the agitated kettle of mixer was a cement powder;
Step 5: connect power supply, mixer stirs 1～3min with the rotating speed of 140r/min, and then, the rotating speed with 285r/min stirs 10～20min again;
Step 6: water is slowly joined in the mixed material of carbon fiber that step 5 obtains and cement powder, then, make mixer stir 1～2min again with the rotating speed of 285r/min.
3. method for drying and dispersing as claimed in claim 1 or 2 is characterized in that: when described chopped carbon fiber is separated into the monofilament state, adopts in the mixer with intersection elastomer blade and stir.
4. method for drying and dispersing as claimed in claim 3 is characterized in that: described chopped carbon fiber and portland cement are tiled in the agitated kettle of glue sand agitator in the mode that replaces.
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| CN 201010224017 CN101890758B (en) | 2010-07-12 | 2010-07-12 | Method for drying and dispersing carbon fibers in cement powder |
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| CN 201010224017 CN101890758B (en) | 2010-07-12 | 2010-07-12 | Method for drying and dispersing carbon fibers in cement powder |
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| CN101890758A true CN101890758A (en) | 2010-11-24 |
| CN101890758B CN101890758B (en) | 2012-11-21 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103753704A (en) * | 2013-12-06 | 2014-04-30 | 河海大学 | Special fiber mortar stirrer and its use method |
| CN112266206A (en) * | 2020-10-29 | 2021-01-26 | 南京工业大学 | Semi-dry mixing method preparation technology for waste rubber particle reinforced composite soil sample |
| CN115041088A (en) * | 2022-07-25 | 2022-09-13 | 广州天极电子科技股份有限公司 | Dielectric material mixing method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03236907A (en) * | 1990-02-14 | 1991-10-22 | Sekisui Chem Co Ltd | Manufacture of fiber-reinforced cement molding material, and fiber-reinforced cement molding manufactured by use of the molding material and its manufacture |
| JPH0977539A (en) * | 1995-09-14 | 1997-03-25 | Mitsubishi Chem Corp | Fiber reinforced concrete |
| CN100999912A (en) * | 2007-01-05 | 2007-07-18 | 同济大学 | Deforming adjustable concrete component and preparation method thereof |
-
2010
- 2010-07-12 CN CN 201010224017 patent/CN101890758B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03236907A (en) * | 1990-02-14 | 1991-10-22 | Sekisui Chem Co Ltd | Manufacture of fiber-reinforced cement molding material, and fiber-reinforced cement molding manufactured by use of the molding material and its manufacture |
| JPH0977539A (en) * | 1995-09-14 | 1997-03-25 | Mitsubishi Chem Corp | Fiber reinforced concrete |
| CN100999912A (en) * | 2007-01-05 | 2007-07-18 | 同济大学 | Deforming adjustable concrete component and preparation method thereof |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103753704A (en) * | 2013-12-06 | 2014-04-30 | 河海大学 | Special fiber mortar stirrer and its use method |
| CN103753704B (en) * | 2013-12-06 | 2016-06-08 | 河海大学 | A kind of fibre mortar special-purpose stirring machine and using method thereof |
| CN112266206A (en) * | 2020-10-29 | 2021-01-26 | 南京工业大学 | Semi-dry mixing method preparation technology for waste rubber particle reinforced composite soil sample |
| CN115041088A (en) * | 2022-07-25 | 2022-09-13 | 广州天极电子科技股份有限公司 | Dielectric material mixing method |
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