CN105710969B - The uniform dispersing method of carbon fiber in CFRC thin plate preparation process - Google Patents

The uniform dispersing method of carbon fiber in CFRC thin plate preparation process Download PDF

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Publication number
CN105710969B
CN105710969B CN201610074770.XA CN201610074770A CN105710969B CN 105710969 B CN105710969 B CN 105710969B CN 201610074770 A CN201610074770 A CN 201610074770A CN 105710969 B CN105710969 B CN 105710969B
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China
Prior art keywords
carbon fiber
cfrc
preparation process
disperse system
dispersing method
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CN201610074770.XA
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Chinese (zh)
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CN105710969A (en
Inventor
王闯
何文敏
彭磊
李炳良
赵丽萍
安宁
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Shaanxi Railway Institute
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Shaanxi Railway Institute
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
    • B28C5/40—Mixing specially adapted for preparing mixtures containing fibres
    • B28C5/402—Methods
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
    • B28C5/40—Mixing specially adapted for preparing mixtures containing fibres
    • B28C5/404—Pre-treatment of fibres
    • 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
    • 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

Abstract

The invention discloses a kind of uniform dispersing methods of carbon fiber in CFRC thin plates preparation process, using ultrasonic wave pre-dispersion, utilize hydroxyethyl cellulose, under conditions of temperature is 38~43 DEG C, pH=7, hydroxyethyl cellulose aqueous dispersant mass fraction are 1.66%~1.78%, carbon fiber in aqueous solution evenly dispersed is realized；And select suitable stirring technique and rational charging sequence, it is evenly dispersed in cement matrix to realize carbon fiber, finally prepare the homogeneous CFRC thin plates test specimen tested for capability of electromagnetic shielding, the harsh conditions such as high temperature, high pressure are not needed, the evenly dispersed of carbon fiber can be realized under normal condition, are suitable for the preparation of various electromagnetic shielding materials, it is at low cost, it is time-consuming few, simple and convenient, practical.

Description

The uniform dispersing method of carbon fiber in CFRC thin plate preparation process
Technical field
The present invention relates to CFRC thin plate preparation fields, and in particular to carbon fiber is uniform in a kind of CFRC thin plates preparation process Dispersing method can be used for the test of such composite material capability of electromagnetic shielding.
Background technology
Carbon Fiber Reinforced Cement Composites are a kind of new function materials that new development is got up, it combines carbon fiber High-temperature behavior, high-strength performance, electric conductivity and the excellent compressive property of cement-base composite material, be that a kind of high-strength light is compound Material, superior electromagnetic radiation resistant performance further expand the application range of this most common construction material of cement, It is the focus that material worker focuses on.Japan has been applied to skyscraper, and Germany has been applied to bridge construction, The U.S. has been applied to anti-electromagnetic radiation field, and China is also interested again in the research of this kind of emerging functional material.However, carbon It is most intractable in fiber reinforced cement-based composite material preparation process to be：The easy boundling of carbon fiber is agglomerating, and surface exhibits are hydrophobic Property, it is difficult to evenly spread in cement matrix.The researcher of the developed countries such as the U.S. uses various surface treatment of carbon fibers technologies, Such as silane treatment, methylcellulose or carboxymethyl cellulose are selected, to realize carbon fiber in aqueous solution and in cement matrix It is evenly dispersed, achieve good effect.But surface treatment of carbon fibers complex process, processing time is not easy to control, of high cost；This Outside, although having selected above two dispersant to promote the dispersion of carbon fiber, the dosage of dispersant is larger, can influence gained The mechanical property and electric property of CFRC test specimens, there is significant limitation.
Invention content
It is difficult to disperse to overcome the problems, such as to prepare carbon fiber in CFRC composite materials, the present invention provides a kind of simple Convenient, easy-operating carbon fiber dispersing method, can prepare the CFRC composite materials of different sizes and shape as needed Product.
To achieve the above object, the technical solution that the present invention takes is：
The uniform dispersing method of carbon fiber, includes the following steps in CFRC thin plate preparation process：
S1, short carbon fiber is placed in 500mL beakers, addition prepares 3/5 of total water consumption needed for CFRC composite materials It after water, is placed in Ultrasound Instrument, 38~44 DEG C of sonic oscillation 15min obtain carbon fiber disperse system A；
S2, load weighted hydroxyethyl cellulose, the quality point of hydroxyethyl cellulose are added in gained carbon fiber disperse system A Number control is 1.66%~1.78%；
S3,2 drop tributyl phosphate antifoaming agent, sonic oscillation is added dropwise into the solution obtained by step S2 with rubber head dropper 10min obtains carbon fiber disperse system B；
S4, load weighted siccative is poured into JJ-5 type cement mortar agitated kettles, mixes slowly 1min, keep its mixing equal It is even,；
S5, carbon fiber disperse system B obtained by step S3 is poured into the agitated kettle obtained by step S4, quickly stirs 2min, adds 2/5 water for entering to prepare total water consumption needed for CFRC composite materials continues to stir 2min, obtains mixture, at this point, mixture is in glue Shape；
S6, gained mixture is poured into the steel oil mould of 160mm × 160mm × 10mm, oily mould one connects two, and centre is used Partition board diverges to, and trowel smoothes out, and is placed in automatic vibration 60s on shake table, scrapes off excess surface object with scraper, be put into standard curing box Interior maintenance, demoulds afterwards for 24 hours, continues standard curing 28d, conserves 20 ± 1 DEG C of the temperature inside the box, humidity >=92%.
Preferably, the power of the Ultrasound Instrument of the step S1 is 250KW.
Preferably, the PH=7 of the carbon fiber disperse system A obtained by the step S1.
Preferably, the siccative includes but not limited to cement, sand, silica flour, water-reducing agent.
The invention has the advantages that：
By means of the surface tension effects of the pre-dispersed and hydroxyethyl cellulose surfactant of ultrasonic wave, height is not needed The evenly dispersed of carbon fiber can be realized in the harsh conditions such as temperature, high pressure under normal condition, prepares homogeneous CFRC thin plate test specimens, It is at low cost suitable for the preparation of various electromagnetic shielding materials, time-consuming few, simple and convenient, practical.
Specific implementation mode
In order to make objects and advantages of the present invention be more clearly understood, the present invention is carried out with reference to embodiments further It is described in detail.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not used to limit this hair It is bright.
Embodiment 1
S1, short carbon fiber is placed in 500mL beakers, addition prepares 3/5 of total water consumption needed for CFRC composite materials After water, it is placed in the Ultrasound Instrument that power is 250KW, 38 DEG C of sonic oscillation 15min obtain carbon fiber disperse system A, the carbon fiber of gained The PH=7 of disperse system A；
S2, load weighted hydroxyethyl cellulose, the quality point of hydroxyethyl cellulose are added in gained carbon fiber disperse system A Number control is 1.66%；
S3,2 drop tributyl phosphate antifoaming agent, sonic oscillation is added dropwise into the solution obtained by step S2 with rubber head dropper 10min obtains carbon fiber disperse system B；
S4, the siccatives such as load weighted cement, sand, silica flour, water-reducing agent are poured into JJ-5 type cement mortar agitated kettles, slowly Speed stirring 1min, makes it be uniformly mixed,；
S5, carbon fiber disperse system B obtained by step S3 is poured into the agitated kettle obtained by step S4, quickly stirs 2min, adds 2/5 water for entering to prepare total water consumption needed for CFRC composite materials continues to stir 2min, obtains mixture；At this point, mixture is in glue Shape；
S6, gained mixture is poured into the steel oil mould of 160mm × 160mm × 10mm, oily mould one connects two, and centre is used Partition board diverges to, and trowel smoothes out, and is placed in automatic vibration 60s on shake table, scrapes off excess surface object with scraper, be put into standard curing box Interior maintenance, demoulds afterwards for 24 hours, continues standard curing 28d, conserves 19 DEG C of the temperature inside the box, humidity >=92%.
Embodiment 2
S1, short carbon fiber is placed in 500mL beakers, addition prepares 3/5 of total water consumption needed for CFRC composite materials After water, it is placed in the Ultrasound Instrument that power is 250KW, 44 DEG C of sonic oscillation 15min obtain carbon fiber disperse system A, the carbon fiber of gained The PH=7 of disperse system A；
S2, load weighted hydroxyethyl cellulose, the quality point of hydroxyethyl cellulose are added in gained carbon fiber disperse system A Number control is 1.78%；
S3,2 drop tributyl phosphate antifoaming agent, sonic oscillation is added dropwise into the solution obtained by step S2 with rubber head dropper 10min obtains carbon fiber disperse system B；
S4, the siccatives such as load weighted cement, sand, silica flour, water-reducing agent are poured into JJ-5 type cement mortar agitated kettles, slowly Speed stirring 1min, makes it be uniformly mixed,；
S5, carbon fiber disperse system B obtained by step S3 is poured into the agitated kettle obtained by step S4, quickly stirs 2min, adds 2/5 water for entering to prepare total water consumption needed for CFRC composite materials continues to stir 2min, obtains mixture；At this point, mixture is in glue Shape；
S6, gained mixture is poured into the steel oil mould of 160mm × 160mm × 10mm, oily mould one connects two, and centre is used Partition board diverges to, and trowel smoothes out, and is placed in automatic vibration 60s on shake table, scrapes off excess surface object with scraper, be put into standard curing box Interior maintenance, demoulds afterwards for 24 hours, continues standard curing 28d, conserves 21 DEG C of the temperature inside the box, humidity >=92%.
Embodiment 3
S1, short carbon fiber is placed in 500mL beakers, addition prepares 3/5 of total water consumption needed for CFRC composite materials After water, it is placed in the Ultrasound Instrument that power is 250KW, 41 DEG C of sonic oscillation 15min obtain carbon fiber disperse system A, the carbon fiber of gained The PH=7 of disperse system A；
S2, load weighted hydroxyethyl cellulose, the quality point of hydroxyethyl cellulose are added in gained carbon fiber disperse system A Number control is 1.72%；
S3,2 drop tributyl phosphate antifoaming agent, sonic oscillation is added dropwise into the solution obtained by step S2 with rubber head dropper 10min obtains carbon fiber disperse system B；
S4, the siccatives such as load weighted cement, sand, silica flour, water-reducing agent are poured into JJ-5 type cement mortar agitated kettles, slowly Speed stirring 1min, makes it be uniformly mixed,；
S5, carbon fiber disperse system B obtained by step S3 is poured into the agitated kettle obtained by step S4, quickly stirs 2min, adds 2/5 water for entering to prepare total water consumption needed for CFRC composite materials continues to stir 2min, obtains mixture；At this point, mixture is in glue Shape；
S6, gained mixture is poured into the steel oil mould of 160mm × 160mm × 10mm, oily mould one connects two, and centre is used Partition board diverges to, and trowel smoothes out, and is placed in automatic vibration 60s on shake table, scrapes off excess surface object with scraper, be put into standard curing box Interior maintenance, demoulds afterwards for 24 hours, continues standard curing 28d, conserves 20 DEG C of the temperature inside the box, humidity >=92%.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art For member, without departing from the principle of the present invention, it can also make several improvements and retouch, these improvements and modifications are also answered It is considered as protection scope of the present invention.

Claims (4)

  1. The uniform dispersing method of carbon fiber, feature include the following steps in 1.CFRC thin plate preparation process：
    S1, short carbon fiber is placed in 500mL beakers, after 3/5 water for preparing total water consumption needed for CFRC composite materials is added, It is placed in Ultrasound Instrument, 38~44 DEG C of sonic oscillation 15min obtain carbon fiber disperse system A；
    S2, load weighted hydroxyethyl cellulose, the mass fraction control of hydroxyethyl cellulose are added in gained carbon fiber disperse system A System is 1.66%~1.78%；
    S3,2 drop tributyl phosphate antifoaming agent are added dropwise into the solution obtained by step S2 with rubber head dropper, sonic oscillation 10min is obtained Carbon fiber disperse system B；
    S4, load weighted siccative is poured into JJ-5 type cement mortar agitated kettles, mixes slowly 1min, it is made to be uniformly mixed；
    S5, carbon fiber disperse system B obtained by step S3 is poured into the agitated kettle obtained by step S4, quickly stirs 2min, system is added 2/5 water of total water consumption needed for standby CFRC composite materials, continues to stir 2min, obtains mixture；
    S6, gained mixture is poured into the steel oil mould of 160mm × 160mm × 10mm, oily mould one connects two, centre partition board It diverges to, trowel smoothes out, and is placed in automatic vibration 60s on shake table, excess surface object is scraped off with scraper, is put into standard curing box and supports Shield, demoulds afterwards for 24 hours, continues standard curing 28d, conserves 20 ± 1 DEG C of the temperature inside the box, humidity >=92%.
  2. 2. the uniform dispersing method of carbon fiber in CFRC thin plates preparation process according to claim 1, which is characterized in that institute The power for stating the Ultrasound Instrument of step S1 is 250KW.
  3. 3. the uniform dispersing method of carbon fiber in CFRC thin plates preparation process according to claim 1, which is characterized in that institute State the PH=7 of the carbon fiber disperse system A obtained by step S1.
  4. 4. the uniform dispersing method of carbon fiber in CFRC thin plates preparation process according to claim 1, which is characterized in that institute It includes cement, sand, silica flour, water-reducing agent to state siccative.
CN201610074770.XA 2016-01-28 2016-01-28 The uniform dispersing method of carbon fiber in CFRC thin plate preparation process Expired - Fee Related CN105710969B (en)

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