CN112794318B - Pipeline lining based on three-dimensional graphene material and preparation method and application thereof - Google Patents
Pipeline lining based on three-dimensional graphene material and preparation method and application thereof Download PDFInfo
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- CN112794318B CN112794318B CN202110122054.5A CN202110122054A CN112794318B CN 112794318 B CN112794318 B CN 112794318B CN 202110122054 A CN202110122054 A CN 202110122054A CN 112794318 B CN112794318 B CN 112794318B
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/15—Nano-sized carbon materials
- C01B32/182—Graphene
- C01B32/194—After-treatment
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
- F16L58/02—Protection of pipes or pipe fittings against corrosion or incrustation by means of internal or external coatings
- F16L58/04—Coatings characterised by the materials used
- F16L58/06—Coatings characterised by the materials used by cement, concrete, or the like
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
A preparation method of three-dimensional graphene cement paste comprises the following steps: dispersing graphite oxide powder in water to obtain graphene oxide dispersion liquid; heating the graphene oxide dispersion liquid to obtain three-dimensional graphene; dispersing the three-dimensional graphene into water to obtain a three-dimensional graphene dispersion liquid; and mixing the three-dimensional graphene dispersion liquid with cement paste to complete the preparation of the three-dimensional graphene cement paste. According to the invention, the three-dimensional graphene cement slurry is utilized to prepare the pipeline lining, based on the characteristic that the three-dimensional graphene and cement hydration products mutually penetrate, the cement hydration is promoted, the content and crystallinity of calcium hydroxide in the cement are improved, and substances in the lining are effectively reduced from being released into water, so that the pipeline lining has stronger leaching resistance, thereby enhancing the corrosion resistance of the lining, and having wide application prospects in the field of municipal engineering tap water transportation and distribution.
Description
Technical Field
The invention belongs to the field of municipal engineering research, and particularly relates to a cement lining for a water supply pipeline and a preparation method thereof, in particular to a three-dimensional graphene material-based pipeline lining and a preparation method and application thereof.
Background
Cement lining pipelines take an important role in the water supply field, but the traditional cement lining has the problems of poor corrosion resistance and water quality deterioration caused by leaching of lining substances, and the inhibition of cement corrosion of the water supply pipelines has important significance for guaranteeing the water quality of drinking water. Graphene is a carbon nanomaterial with atomic layer thickness, which is a hexagonal honeycomb arrangement formed by sp2 hybridization of carbon atoms, and has been widely used in the environmental and energy fields due to its high specific surface area and excellent electrical properties. However, how to apply graphene materials to the stability of the water supply pipe lifting liner has not been reported.
Disclosure of Invention
Accordingly, one of the primary objects of the present invention is to provide a three-dimensional graphene material-based pipe lining, and a preparation method and application thereof, so as to at least partially solve at least one of the above-mentioned problems.
In order to achieve the above object, as one aspect of the present invention, there is provided a method for preparing a three-dimensional graphene cement paste, comprising:
(1) Dispersing graphite oxide powder in water to obtain graphene oxide dispersion liquid;
(2) Heating the graphene oxide dispersion liquid in a liquid-tight manner to obtain three-dimensional graphene;
(3) Dispersing the three-dimensional graphene into water to obtain a three-dimensional graphene dispersion liquid;
(4) And mixing the three-dimensional graphene dispersion liquid with cement paste to complete the preparation of the three-dimensional graphene cement paste.
As another aspect of the invention, the three-dimensional graphene cement paste prepared by the preparation method is also provided.
As another aspect of the present invention, there is also provided a method for preparing a pipe lining based on a three-dimensional graphene material, including:
coating the inner wall of the pipeline with the three-dimensional graphene cement paste;
and curing the pipeline and the three-dimensional graphene cement paste coated on the inner wall of the pipeline to finish the preparation of the pipeline lining.
As a further aspect of the invention, the three-dimensional graphene material-based pipeline lining prepared by the preparation method is also provided.
Finally, as a further aspect of the invention, there is also provided the use of a three-dimensional graphene material based pipe lining as described above in the field of municipal engineering.
Based on the technical scheme, the three-dimensional graphene material-based pipeline lining and the preparation method and application thereof have at least one of the following effects compared with the prior art:
1. according to the invention, three-dimensional graphene is doped in the cement lining, the three-dimensional graphene and cement hydration products penetrate through each other, so that cement hydration is promoted, the content and crystallinity of calcium hydroxide in cement are improved, and compared with the cement lining without the three-dimensional graphene, the mass fraction of calcium hydroxide in the pipeline lining based on the three-dimensional graphene material is improved by more than or equal to 1.5%; thereby better maintaining the passivation state of the inner wall of the metal pipeline and better protecting the inner wall of the metal pipeline;
2. in the hydration process of the cement, hydration products are inserted in a three-dimensional graphene network, so that stronger surface complexing and electrostatic adsorption effects of the three-dimensional graphene on calcium ions in the cement are obtained, the release of the calcium ions in the lining to water can be greatly slowed down, substances in the lining are effectively reduced from being released into the water, the cement has stronger leaching resistance, compared with the traditional cement lining, in the 180d soaking process of the pipeline lining based on the three-dimensional graphene material, the TDS (total dissolved solids) release amount is reduced by more than or equal to 15% compared with the cement lining without the three-dimensional graphene, the calcium ion release amount is reduced by more than or equal to 15% compared with the cement lining without the three-dimensional graphene, and the water outlet pH is reduced by 0.04-0.2 compared with the cement lining without the three-dimensional graphene, so that the corrosion resistance of the lining is enhanced;
3. the preparation method is simple, and has wide application prospect in the field of municipal engineering tap water transportation and distribution.
Drawings
Fig. 1 is a flowchart of a method for preparing a three-dimensional graphene cement slurry in this embodiment;
FIG. 2 is a graph showing the time-dependent calcium ion release of the cement pipe lining and the three-dimensional graphene cement pipe lining during the soaking process in the present embodiment;
FIG. 3 is a schematic diagram showing the time-dependent change of TDS release amount of the cement pipe lining and the three-dimensional graphene cement pipe lining during the soaking process in the present embodiment;
fig. 4 is a schematic diagram showing the change of the pH of the effluent water with time during the soaking process of the cement pipe lining and the three-dimensional graphene cement pipe lining in the present embodiment.
Detailed Description
The present invention will be further described in detail below with reference to specific embodiments and with reference to the accompanying drawings, in order to make the objects, technical solutions and advantages of the present invention more apparent.
In some embodiments of the present invention, a method for preparing a three-dimensional graphene cement paste is disclosed, as shown in fig. 1, including:
(1) Dispersing graphite oxide powder in water to obtain graphene oxide dispersion liquid;
(2) Heating the graphene oxide dispersion liquid in a liquid-tight manner to obtain three-dimensional graphene;
(3) Dispersing the three-dimensional graphene into water to obtain a three-dimensional graphene dispersion liquid;
(4) And mixing the three-dimensional graphene dispersion liquid with cement paste to complete the preparation of the three-dimensional graphene cement paste.
In some embodiments of the present invention, the substrate is made of any one of sapphire, silicon, gallium nitride and silicon carbide; in the step (1), the concentration of the graphite oxide powder in the graphene oxide dispersion liquid is 1 to 20mg/mL;
in the step (2), the temperature of the airtight heating is 80-400 ℃;
in the step (2), the airtight heating time is 6 to 48 hours;
in the step (3), the concentration of the three-dimensional graphene in the three-dimensional graphene dispersion liquid is 1 to 100mg/mL.
In some embodiments of the invention, in step (4), the cement slurry preparation material comprises portland cement or portland cement;
in some embodiments of the present invention, in step (4), the mass ratio of the three-dimensional graphene to the three-dimensional graphene cement paste is 0.01% to 1%;
in some embodiments of the invention, in step (4), the water cement ratio of the three-dimensional graphene cement slurry is 0.3 to 0.5.
In some embodiments of the invention, a three-dimensional graphene cement paste prepared according to the preparation method is also disclosed.
In some embodiments of the invention, a method for preparing a pipeline lining based on a three-dimensional graphene material is also disclosed, comprising:
coating the inner wall of the pipeline with the three-dimensional graphene cement paste;
and curing the pipeline and the three-dimensional graphene cement paste coated on the inner wall of the pipeline to finish the preparation of the pipeline lining.
In some embodiments of the invention, the lining is performed by a method including centrifugal lining, mechanical spraying, or manual lining.
In some embodiments of the invention, the curing method comprises natural curing or steam curing;
wherein when the maintenance method is a steam maintenance method,
the steam curing process temperature is 40 to 80 ℃;
the steam curing process time is 3 to 10 hours.
In some embodiments of the present invention, a three-dimensional graphene material-based pipe lining prepared according to the preparation method described above is also disclosed.
In some embodiments of the present invention, during a 180 day deionized water soak,
the pH value of the effluent of the corrosion-resistant cement lining of the three-dimensional graphene water supply pipeline in the soaking process is 10.64-11.56;
the release amount of calcium ions of the corrosion-resistant cement lining of the three-dimensional graphene water supply pipeline in the soaking process is 1950-2300 mu g/cm 2 ；
The release amount of the soluble solids of the corrosion-resistant cement lining of the three-dimensional graphene water supply pipeline in the soaking process is 11000-12000 mug/cm 2 ；
The calcium hydroxide of the corrosion-resistant cement lining of the three-dimensional graphene water supply pipeline accounts for 10-11% of the mass of the lining of the pipeline.
In some embodiments of the invention, the application of the three-dimensional graphene material-based pipeline lining in the municipal engineering field is also disclosed.
The invention is different from the traditional cement mortar lining, a small amount of three-dimensional graphene is doped in the cement lining for the first time, the doping of the three-dimensional graphene can promote cement hydration, the content and crystallinity of calcium hydroxide in the cement are improved, and the passivation state of the inner wall of the metal pipeline can be better maintained. In addition, hydration products of the cement are inserted in the three-dimensional graphene network in the hydration process, so that stronger surface complexing and electrostatic adsorption effects of the three-dimensional graphene on calcium ions in the cement are facilitated, the release of the calcium ions in the lining into water can be greatly slowed down, the corrosion resistance of the cement lining is enhanced, and the cement lining has a wide application prospect in the field of municipal engineering tap water transportation and distribution.
Specifically, one embodiment of the invention discloses a preparation method of a three-dimensional graphene water supply pipeline corrosion-resistant cement lining (namely a preparation method of a pipeline lining based on a three-dimensional graphene material), which comprises the following steps:
(1) Dispersing graphite oxide powder in water;
(2) Heating the dispersion liquid obtained in the step (1) in a sealed manner;
(3) Ultrasonically dispersing the three-dimensional graphene obtained in the step (2) into water;
(4) Mixing the dispersion liquid obtained in the step (3) with cement paste to obtain three-dimensional graphene cement paste;
(5) Coating the three-dimensional graphene cement paste obtained in the step (4) on the inner wall of a pipeline;
(6) And (3) curing the lined pipeline obtained in the step (5), and obtaining the corrosion-resistant cement lining (namely the pipeline lining based on the three-dimensional graphene material) of the three-dimensional graphene water supply pipeline after curing.
Wherein the concentration of the graphite oxide powder in the step (1) is 1 to 20mg/ml, preferably 1 to 10mg/ml, further preferably 5mg/ml.
Wherein the closed heating temperature in step (2) is, for example, 80 ℃ to 400 ℃, preferably 100 to 200 ℃, further preferably 150 ℃; the heating time is, for example, 6 to 48 hours, preferably 10 to 20 hours, and more preferably 12 hours.
Wherein the airtight heating in the step (2) is performed in a polytetrafluoroethylene reaction kettle, for example.
Wherein the concentration of the three-dimensional graphene in the three-dimensional graphene dispersion liquid in the step (3) is 1 to 100mg/mL.
Wherein, the cement slurry in the step (4) is prepared from Portland cement or ordinary Portland cement;
wherein, the silicate cement is silicate cement clinker taking calcium silicate as main material, limestone with the concentration of less than 5 percent or granulated blast furnace slag, and a proper amount of gypsum is ground into fine hydraulic cementing material;
the ordinary Portland cement is a hydraulic cementing material prepared by grinding Portland cement clinker, 5% -20% of mixed materials and a proper amount of gypsum;
wherein the material for preparing the cement paste in the step (4) is preferably ordinary Portland cement;
wherein the cement ratio of the cement slurry in step (4) is, for example, 0.3 to 0.5, preferably 0.3 to 0.4, and more preferably 0.3; the percentage of the three-dimensional graphene in the cement paste mass is, for example, 0.01 to 1%, preferably 0.01 to 0.1%, and more preferably 0.03%.
Wherein, the lining method in the step (5) comprises a centrifugal lining method, a mechanical spraying method and a manual lining method, and is preferably a centrifugal lining method.
Wherein the lining coater in step (5) has a rotational speed of, for example, 900 to 1500 r.min -1 Preferably 1200 to 1400 r.min -1 More preferably 1200 r.min -1 。
Wherein, the curing method in the step (6) comprises natural curing and steam curing, preferably steam curing.
Wherein the steam curing temperature in step (6) is, for example, 40 to 80 ℃, preferably 50 to 60 ℃, further preferably 55 ℃; the steam curing time is, for example, 3 to 10 hours, preferably 5 to 7 hours, and more preferably 5 hours.
The invention also discloses a three-dimensional graphene water supply pipeline corrosion-resistant cement lining (namely a pipeline lining based on three-dimensional graphene materials) prepared by the preparation method. The liner has strong resistance to leaching of substances, for example, a TDS release of 11888 μg/cm in a 180 day soak 2 The reduction of the cement lining is more than or equal to 15 percent compared with the cement lining without the three-dimensional graphene, and the release amount of calcium ions is 2222 mug/cm 2 The cement lining is reduced by more than or equal to 15% compared with the cement lining without the three-dimensional graphene; the pH value of the effluent is 10.7, which is reduced by 0.04 to 0.2 compared with the cement lining without the three-dimensional graphene.
In addition, the lining has higher calcium hydroxide content, so that the inner wall of a metal pipeline can be better protected, for example, the lining comprises 10.18% of calcium hydroxide by mass percent, and compared with a cement lining without added three-dimensional graphene, the lining comprises 1.5% or more of calcium hydroxide by mass percent.
The invention also discloses application of the three-dimensional graphene water supply pipeline corrosion-resistant cement lining (namely the pipeline lining based on the three-dimensional graphene material) in municipal engineering water supply pipelines.
The technical scheme of the invention is further described below by means of specific embodiments and with reference to the accompanying drawings. It should be noted that the following specific examples are given by way of illustration only and the scope of the present invention is not limited thereto.
In the following examples, the experimental methods used, unless otherwise specified, were all conventional. In the following examples, materials, reagents and the like used, unless otherwise specified, were obtained commercially or were self-prepared by a known preparation method.
Example 1
The three-dimensional graphene water supply pipeline corrosion-resistant cement lining (namely a pipeline lining based on a three-dimensional graphene material) is prepared by the following specific steps:
adding graphite oxide powder into water, crushing for 15min under the conditions of 25KHz and 1000w by using an ultrasonic cell crusher, then putting into an ultrasonic cleaner, and performing ultrasonic treatment under the conditions of 40KHz and 300w for 30min, and repeating the steps for 3 times to obtain the graphene oxide dispersion liquid with the concentration of 5mg/mL.
And (3) placing the dispersion liquid into a polytetrafluoroethylene lining stainless steel reaction kettle, heating for 12 hours at 150 ℃, and obtaining the three-dimensional graphene solid after the reaction is finished.
Grinding three-dimensional graphene solid, adding a small amount of water, performing ultrasonic treatment in an ultrasonic cleaner at 40KHz and 300w for 30min, and adding water to make the concentration of the three-dimensional graphene dispersion liquid be 5mg/mL.
P.O 52.5.5 ordinary silicate cement is taken, three-dimensional graphene dispersion liquid and tap water are added in the stirring process, so that the water-cement ratio of the finally mixed three-dimensional graphene cement paste is 0.3, and the three-dimensional graphene accounts for 0.03% of the mass of the three-dimensional graphene cement paste.
Adding the mixed three-dimensional graphene cement paste into a spheroidal graphite cast iron pipe cement lining machine at 1200 r.min -1 And the rotating speed of the steel pipe is centrifugally lined on the inner wall of the DN100 centrifugal spheroidal graphite cast iron pipe.
After lining is completed, the lining stays for 5 hours at room temperature, and then steam curing is carried out for 5 hours at 55 ℃ to obtain the three-dimensional graphene water supply pipeline corrosion-resistant cement lining (namely the pipeline lining based on the three-dimensional graphene material).
Comparative example 1
And three-dimensional graphene is not added in the pipeline lining.
For comparison, this comparative example 1 differs from example 1 only in that no three-dimensional graphene was added, and a cement lining to which no three-dimensional graphene was added was prepared with the same water-cement ratio and lining maintenance conditions. The release amount of calcium ions in the deionized water soaking process of the cement lining (i.e. the cement lining without adding the three-dimensional graphene) and the three-dimensional graphene cement lining (i.e. the corrosion-resistant cement lining of the three-dimensional graphene water supply pipeline) is shown as figure 2, the three-dimensional graphene cement lining can obviously reduce the release amount of calcium ions, and the release amount of calcium ions in the soaking process of 180 days is 2222 mug/cm 2 The cement lining is reduced by 15.73% compared with the cement lining without the three-dimensional graphene.
The TDS release amount of the cement lining (i.e. the cement lining without adding the three-dimensional graphene) and the three-dimensional graphene cement lining (i.e. the corrosion-resistant cement lining of the three-dimensional graphene water supply pipeline) in the deionized water soaking process is shown in the figure 3, the TDS release amount of the three-dimensional graphene cement lining can be obviously reduced, and in the 180d soaking process, the TDS release amount of the three-dimensional graphene cement paste lining is 11888 mug/cm 2 Is reduced by 18.93 percent compared with the cement lining.
Example 2
The three-dimensional graphene water supply pipeline corrosion-resistant cement lining (namely a pipeline lining based on a three-dimensional graphene material) is prepared by the following specific steps:
adding graphite oxide powder into water, crushing for 15min under the conditions of 25KHz and 1000w by using an ultrasonic cell crusher, then putting into an ultrasonic cleaner, and performing ultrasonic treatment under the conditions of 40KHz and 300w for 30min, and repeating the steps for 3 times to obtain the graphene oxide dispersion liquid with the concentration of 10 mg/mL.
And (3) placing the dispersion liquid into a polytetrafluoroethylene lining stainless steel reaction kettle, heating for 20 hours at 120 ℃, and obtaining the three-dimensional graphene solid after the reaction is finished.
Grinding three-dimensional graphene solid, adding a small amount of water, performing ultrasonic treatment in an ultrasonic cleaner at 40KHz and 300w for 30min, and adding water to make the concentration of the three-dimensional graphene dispersion liquid be 20mg/mL.
P.O 52.5.5 ordinary Portland cement is taken, three-dimensional graphene dispersion liquid and tap water are added in the stirring process, so that the water-cement ratio of the finally mixed cement slurry is 0.3, and the three-dimensional graphene accounts for 0.03% of the mass of the cement.
Adding the mixed cement into a spheroidal graphite cast iron pipe cement lining machine at 1200 r.min -1 And the rotating speed of the steel pipe is centrifugally lined on the inner wall of the DN100 centrifugal spheroidal graphite cast iron pipe.
After lining is completed, the lining stays for 5 hours at room temperature, and then steam curing is carried out for 5 hours at 55 ℃ to obtain the three-dimensional graphene water supply pipeline corrosion-resistant cement lining (namely the pipeline lining based on the three-dimensional graphene material).
Comparative example 2
And three-dimensional graphene is not added in the pipeline lining.
For comparison, this comparative example 2 was different from example 2 only in that no three-dimensional graphene was added, and a cement lining to which no three-dimensional graphene was added was prepared with the same water cement ratio and lining maintenance conditions. The pH of the effluent of the cement liner (i.e., the cement liner without added three-dimensional graphene) and the three-dimensional graphene cement liner (i.e., the corrosion-resistant cement liner of the three-dimensional graphene water supply pipeline) during deionized water immersion is shown in fig. 4. The three-dimensional graphene cement paste lining can obviously reduce the pH value of the effluent, the pH value of the effluent of the three-dimensional graphene cement lining is 10.7 in the 180-day soaking process, and the pH value of the effluent of the three-dimensional graphene cement paste lining is reduced by 0.04 to 0.2 compared with that of the effluent of the cement lining.
Example 3
The three-dimensional graphene water supply pipeline corrosion-resistant cement lining (namely a pipeline lining based on a three-dimensional graphene material) is prepared by the following specific steps: adding graphite oxide powder into water, crushing for 15min under the conditions of 25KHz and 1000w by using an ultrasonic cell crusher, then putting into an ultrasonic cleaner, and performing ultrasonic treatment under the conditions of 40KHz and 300w for 30min, and repeating the steps for 3 times to obtain the graphene oxide dispersion liquid with the concentration of 5mg/mL.
And (3) placing the dispersion liquid into a polytetrafluoroethylene lining stainless steel reaction kettle, heating for 10 hours at 200 ℃, and obtaining the three-dimensional graphene solid after the reaction is finished.
Grinding three-dimensional graphene solid, adding a small amount of water, performing ultrasonic treatment in an ultrasonic cleaner at 40KHz and 300w for 30min, and adding water to make the concentration of the three-dimensional graphene dispersion liquid be 5mg/mL.
P.O 52.5.5 ordinary Portland cement is taken, three-dimensional graphene dispersion liquid and tap water are added in the stirring process, so that the cement water cement ratio of the finally mixed cement is 0.5, and the three-dimensional graphene accounts for 0.03% of the cement mass.
Adding the mixed cement into a spheroidal graphite cast iron pipe cement lining machine at 1200 r.min -1 And the rotating speed of the steel pipe is centrifugally lined on the inner wall of the DN100 centrifugal spheroidal graphite cast iron pipe.
And after lining is finished, curing for 7 days at room temperature to obtain the corrosion-resistant cement lining (namely the lining of the pipeline based on the three-dimensional graphene material) of the three-dimensional graphene water supply pipeline.
Comparative example 3
And three-dimensional graphene is not added in the pipeline lining.
For comparison, this comparative example 3 differs from example 3 only in that no three-dimensional graphene was added, and a cement lining to which no three-dimensional graphene was added was prepared with the same water-cement ratio and lining maintenance conditions. The calcium hydroxide in the cement lining (namely the cement lining without the three-dimensional graphene) accounts for 8.53% of the mass fraction of the lining;
the calcium hydroxide in the three-dimensional graphene cement lining (namely the corrosion-resistant cement lining of the three-dimensional graphene water supply pipeline) accounts for 10.18% of the mass fraction of the lining.
Example 4
The three-dimensional graphene water supply pipeline corrosion-resistant cement lining (namely a pipeline lining based on a three-dimensional graphene material) is prepared by the following specific steps:
adding graphite oxide powder into water, crushing for 15min under the conditions of 25KHz and 1000w by using an ultrasonic cell crusher, then putting into an ultrasonic cleaner, and performing ultrasonic treatment under the conditions of 40KHz and 300w for 30min, and repeating the steps for 3 times to obtain graphene oxide dispersion liquid with the concentration of 1 mg/mL.
And (3) placing the dispersion liquid into a polytetrafluoroethylene lining stainless steel reaction kettle, heating for 20 hours at 100 ℃, and obtaining the three-dimensional graphene solid after the reaction is finished.
Grinding three-dimensional graphene solid, adding a small amount of water, performing ultrasonic treatment in an ultrasonic cleaner at 40KHz and 300w for 30min, and adding water to make the concentration of the three-dimensional graphene dispersion liquid be 100mg/mL.
P.O 52.5.5 ordinary Portland cement is taken, three-dimensional graphene dispersion liquid and tap water are added in the stirring process, so that the cement water cement ratio of the finally mixed cement is 0.4, and the three-dimensional graphene accounts for 0.1% of the cement mass.
Adding the mixed cement into a spheroidal graphite cast iron pipe cement lining machine at 1200 r.min -1 And the rotating speed of the steel pipe is centrifugally lined on the inner wall of the DN100 centrifugal spheroidal graphite cast iron pipe.
After lining is completed, the lining stays for 5 hours at room temperature, and then steam curing is carried out for 10 hours at 55 ℃ to obtain the three-dimensional graphene water supply pipeline corrosion-resistant cement lining (namely the pipeline lining based on the three-dimensional graphene material).
The foregoing description of the embodiments has been provided for the purpose of illustrating the general principles of the invention, and is not meant to limit the invention thereto, but to limit the invention thereto, and any modifications, equivalents, improvements and equivalents thereof may be made without departing from the spirit and principles of the invention.
Claims (9)
1. The preparation method of the three-dimensional graphene cement paste is characterized by comprising the following steps of:
(1) Dispersing graphite oxide powder in water to obtain graphene oxide dispersion liquid;
(2) Heating the graphene oxide dispersion liquid in a liquid-tight manner to obtain three-dimensional graphene;
(3) Dispersing the three-dimensional graphene into water to obtain a three-dimensional graphene dispersion liquid;
(4) Mixing the three-dimensional graphene dispersion liquid with cement paste to finish the preparation of the three-dimensional graphene cement paste;
wherein in the step (1), the concentration of graphite oxide powder in the graphene oxide dispersion liquid is 5mg/mL;
in the step (2), the temperature of the closed heating is 150 ℃;
in the step (2), the closed heating time is 12 hours;
the concentration of the three-dimensional graphene in the three-dimensional graphene dispersion liquid is 5mg/mL;
in the step (4), the mass ratio of the three-dimensional graphene to the three-dimensional graphene cement paste is 0.03%;
in the step (4), the water-cement ratio of the three-dimensional graphene cement slurry is 0.3.
2. The method according to claim 1, wherein,
in the step (4), the cement paste is prepared from Portland cement or Portland cement.
3. The three-dimensional graphene cement paste prepared by the preparation method according to claim 1 or 2.
4. The preparation method of the pipeline lining based on the three-dimensional graphene material is characterized by comprising the following steps of:
lining the inner wall of the pipeline with the three-dimensional graphene cement paste according to claim 3;
and curing the pipeline and the three-dimensional graphene cement paste coated on the inner wall of the pipeline to finish the preparation of the pipeline lining.
5. The method according to claim 4, wherein,
the lining coating method comprises a centrifugal lining coating method, a mechanical spraying method or a manual lining coating method.
6. The method according to claim 4, wherein,
the curing method comprises natural curing or steam curing;
when the curing method is a steam curing method,
the steam curing process temperature is 40 to 80 ℃;
the steam curing process time is 3 to 10 hours.
7. A three-dimensional graphene material-based pipe lining prepared by the preparation method according to any one of claims 4 to 6.
8. The three-dimensional graphene-material-based conduit liner of claim 7,
during the deionized water soaking process for 180 days,
the pH value of the effluent of the corrosion-resistant cement lining of the three-dimensional graphene water supply pipeline in the soaking process is 10.64-11.56;
the release amount of calcium ions of the corrosion-resistant cement lining of the three-dimensional graphene water supply pipeline in the soaking process is 1950-2300 mu g/cm 2 ；
The release amount of the soluble solids of the corrosion-resistant cement lining of the three-dimensional graphene water supply pipeline in the soaking process is 11000-12000 mug/cm 2 ；
The calcium hydroxide of the corrosion-resistant cement lining of the three-dimensional graphene water supply pipeline accounts for 10-11% of the mass of the lining of the pipeline.
9. Use of a three-dimensional graphene material-based pipe lining according to claim 7 or 8 in the field of municipal engineering.
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| US20180277279A1 (en) * | 2016-11-23 | 2018-09-27 | David Brereton | Graphene Containing Composition, Multilayered Hydrogen Graphene Composition, Method of Making Both Compositions, and Applications of Both Compositions |
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