CN115043666A - Coal gangue-based self-temperature-adjusting wall and preparation method thereof - Google Patents
Coal gangue-based self-temperature-adjusting wall and preparation method thereof Download PDFInfo
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- 238000002360 preparation method Methods 0.000 title claims abstract description 23
- 238000005187 foaming Methods 0.000 claims abstract description 67
- 239000012782 phase change material Substances 0.000 claims abstract description 39
- 239000002131 composite material Substances 0.000 claims abstract description 36
- 239000007788 liquid Substances 0.000 claims abstract description 34
- 239000000843 powder Substances 0.000 claims abstract description 31
- 239000000203 mixture Substances 0.000 claims abstract description 26
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 24
- 239000012744 reinforcing agent Substances 0.000 claims abstract description 21
- 239000011248 coating agent Substances 0.000 claims abstract description 18
- 238000000576 coating method Methods 0.000 claims abstract description 18
- 239000000853 adhesive Substances 0.000 claims abstract description 16
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- 238000002791 soaking Methods 0.000 claims abstract description 16
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- 229910052788 barium Inorganic materials 0.000 description 1
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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
- C04B28/04—Portland cements
-
- 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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/02—Selection of the hardening environment
- C04B40/024—Steam hardening, e.g. in an autoclave
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K5/00—Heat-transfer, heat-exchange or heat-storage materials, e.g. refrigerants; Materials for the production of heat or cold by chemical reactions other than by combustion
- C09K5/02—Materials undergoing a change of physical state when used
- C09K5/06—Materials undergoing a change of physical state when used the change of state being from liquid to solid or vice versa
- C09K5/063—Materials absorbing or liberating heat during crystallisation; Heat storage materials
-
- 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
- C04B2111/40—Porous or lightweight materials
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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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
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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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/30—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values
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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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/30—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values
- C04B2201/32—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values for the thermal conductivity, e.g. K-factors
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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
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- Physics & Mathematics (AREA)
- Combustion & Propulsion (AREA)
- Thermal Sciences (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
- Manufacturing Of Micro-Capsules (AREA)
Abstract
The invention relates to the technical field of building materials, in particular to a coal gangue-based self-temperature-regulating wall and a preparation method thereof, wherein the preparation method comprises the following steps: adding water into the coal gangue powder, the reinforcing agent, the initiator, the foaming agent and the adhesive for mixing to obtain a mixture; sequentially foaming and maintaining the mixture to obtain an inorganic foaming wall; soaking the inorganic foaming wall body in a liquid phase-change material to obtain a phase-change temperature-regulating wall body; coating a PVC composite material on the surface of the phase-change temperature-regulating wall body to obtain the coal gangue-based self-temperature-regulating wall body; the PVC composite material comprises PVC resin, graphene and carbon nanotubes; the liquid phase-change material comprises solid paraffin, liquid paraffin and phase-change microcapsules. The self-temperature-adjusting wall prepared by the preparation method provided by the invention has a good self-temperature-adjusting effect.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to a coal gangue-based self-temperature-adjusting wall and a preparation method thereof.
Background
With the development of socioeconomic and improvement of living standard, the nation and society put forward higher and higher requirements on novel building walls. At present, the thermal insulation wall is mostly realized by bonding thermal insulation materials outside the wall. The cohesive heat-insulating material comprises a polystyrene foam board or a high-density polystyrene extruded board, but the heat-insulating material has the defects of poor fireproof performance, low firmness of a heat-insulating layer, short service life and the like.
Therefore, in order to overcome the above defects, the research on the self-temperature-adjusting wall is more and more, and the preparation of the self-temperature-adjusting wall is mostly as follows: the wall body base material and the phase change material are blended and then maintained to obtain the self-temperature-regulating phase change composite heat-insulating wall body, however, the wall body obtained by the preparation method has the advantages of small energy storage, poor heat exchange energy and unsatisfactory self-temperature-regulating effect.
Disclosure of Invention
In view of the above, the invention aims to provide a coal gangue-based self-temperature-regulating wall and a preparation method thereof.
In order to realize the aim, the invention provides a preparation method of a coal gangue-based self-temperature-regulating wall body, which comprises the following steps:
adding water into the coal gangue powder, the reinforcing agent, the initiator, the foaming agent and the adhesive for mixing to obtain a mixture;
sequentially foaming and maintaining the mixture to obtain an inorganic foaming wall;
soaking the inorganic foaming wall body in a liquid phase-change material to obtain a phase-change temperature-regulating wall body;
coating a PVC composite material on the surface of the phase-change temperature-regulating wall body to obtain the coal gangue-based self-temperature-regulating wall body;
the PVC composite material comprises PVC resin, graphene and carbon nanotubes;
the liquid phase-change material comprises solid paraffin, liquid paraffin and phase-change microcapsules.
Preferably, the mass ratio of the solid paraffin to the liquid paraffin to the phase-change microcapsule in the liquid phase-change material is 40:35: 25.
Preferably, the mass ratio of the graphene to the carbon nanotube to the PVC resin in the PVC composite material is 10-20: 5-15: 65-85.
Preferably, the reinforcing agent is a mixture of landplaster, foundry sand and slag.
Preferably, the mass ratio of the coal gangue powder to the reinforcing agent is 50-70: 25-40.
Preferably, the mass ratio of the coal gangue powder to the adhesive is 50-70: 5-10.
Preferably, the adsorption capacity of the inorganic foaming wall body to the liquid phase-change material is 20-30% of the total mass of the coal gangue powder, the reinforcing agent and the adhesive.
Preferably, the soaking temperature is 50-70 ℃, and the soaking time is 0.5-2 h.
Preferably, the thickness of the coating layer obtained by coating is 0.4-0.6 mm.
The invention also provides the gangue-based self-temperature-regulating wall prepared by the preparation method, and the gangue-based self-temperature-regulating wall comprises a composite wall and a PVC composite material layer coated on the surface of the composite wall; the composite wall body is an inorganic foaming wall body which adsorbs liquid phase-change materials.
The invention provides a preparation method of a coal gangue-based self-temperature-regulating wall body, which comprises the following steps: adding water into the coal gangue powder, the reinforcing agent, the initiator, the foaming agent and the adhesive for mixing to obtain a mixture; foaming and maintaining the mixture to obtain an inorganic foaming wall; soaking the inorganic foaming wall body in a liquid phase-change material to obtain a phase-change temperature-regulating wall body; coating a phase-change temperature-adjusting wall with a PVC composite material to obtain the coal gangue-based self-temperature-adjusting wall; the PVC composite material comprises PVC resin, graphene and carbon nanotubes; the liquid phase-change material comprises solid paraffin, liquid paraffin and phase-change microcapsules. The inorganic foaming wall body is prepared firstly, then the inorganic foaming wall body is soaked in the liquid phase-change material, and in the soaking process, the inorganic foaming wall body can adsorb the phase-change material to an open pore structure in the inorganic foaming wall body. Meanwhile, the PVC composite material with high heat conductivity is coated on the surface of the phase-change temperature-adjusting wall body, so that the liquid phase-change material can be better adsorbed in pores of the wall body and cannot overflow; on the other hand, the heat exchange between the liquid wanted-change material and the outside can be improved, the heat conduction efficiency is improved, and the self-temperature-adjusting performance of the wall body is enhanced.
Description of the drawings:
FIG. 1 is a schematic structural diagram of a coal gangue-based self-temperature-regulating wall prepared in examples 1 to 3.
Detailed Description
The invention provides a preparation method of a coal gangue-based self-temperature-regulating wall body, which comprises the following steps:
adding water into the coal gangue powder, the reinforcing agent, the initiator, the foaming agent and the adhesive for mixing to obtain a mixture;
sequentially foaming and maintaining the mixture to obtain an inorganic foaming wall;
soaking the inorganic foaming wall body in a liquid phase-change material to obtain a phase-change temperature-regulating wall body;
and coating a PVC composite material on the surface of the phase-change temperature-regulating wall body to obtain the coal gangue-based self-temperature-regulating wall body.
The coal gangue powder, the reinforcing agent, the initiator, the foaming agent and the adhesive are mixed with water to obtain a mixture.
In the present invention, the reinforcing agent is preferably a mixture of landplaster, foundry sand and slag; the mass ratio of the gypsum powder to the foundry sand to the slag in the reinforcing agent is preferably 5-10: 10-15: 10 to 15, more preferably 6 to 9: 11-14: 11 to 13. In the present invention, the initiator preferably includes sodium bicarbonate, sodium alkyl sulfonate or sodium fatty alcohol ether sulfate, and more preferably sodium bicarbonate. In the present invention, the foaming agent includes metallic zinc, metallic lead or metallic barium, and is more preferably metallic zinc. In the present invention, the binder preferably comprises portland cement.
In the invention, the mass ratio of the coal gangue powder to the adhesive is preferably 50-70: 5-10, and more preferably 55-65: 6-9. In the invention, the mass ratio of the coal gangue powder to the reinforcing agent is preferably 50-70: 25-40, and more preferably 55-65: 30-35. In the invention, the ratio of the total mass of the coal gangue powder, the reinforcing agent and the adhesive to the mass of the initiator is preferably 100: 0.02-0.04, and more preferably 100: 0.025 to 0.03; in the invention, the mass ratio of the total mass of the coal gangue powder, the reinforcing agent and the adhesive to the foaming agent is preferably 100: 0.04-0.06, and more preferably 100: 0.045-0.05.
After the mixture is obtained, the invention sequentially carries out foaming and maintenance on the mixture to obtain the inorganic foaming wall.
In the invention, the foaming temperature is preferably 40-60 ℃, and more preferably 50-60 ℃; the foaming time is 2 to 4 hours, and more preferably 3 to 4 hours. In the present invention, the foaming is preferably performed in a curing oven. In the embodiment of the invention, the width of the inorganic foaming wall body is preferably 600mm, the thickness is preferably 120mm, and the length is preferably 3000 mm.
In the invention, the curing is preferably steam curing, and the temperature of the steam curing is preferably 100-150 ℃, and more preferably 110-140 ℃; the curing time is preferably 8 to 12 hours, and more preferably 9 to 10 hours.
After the inorganic foaming wall is obtained, the inorganic foaming wall is soaked in the liquid phase-change material to obtain the phase-change temperature-adjusting wall.
In the invention, the liquid phase-change material comprises solid paraffin, liquid paraffin and phase-change microcapsules; the mass ratio of the solid paraffin to the liquid paraffin to the phase-change microcapsule is preferably 40:35: 25. in the invention, the adsorption capacity of the inorganic foaming wall body to the liquid phase-change material is preferably 20-30% of the total mass of the coal gangue powder, the reinforcing agent and the adhesive, and more preferably 25-30%. In the present invention, the phase transition temperature of the liquid phase change material is preferably 25 ℃.
In the invention, the soaking temperature is preferably 50-70 ℃, and more preferably 55-65 ℃; the soaking time is preferably 0.5 to 2 hours, and more preferably 1 to 1.5 hours.
After the phase-change temperature-regulating wall body is obtained, the PVC composite material is coated on the surface of the phase-change temperature-regulating wall body, and the coal gangue-based self-temperature-regulating wall body is obtained.
In the present invention, before the coating, it is preferable to further scrub the phase-change temperature-adjusting wall, and the scrubbing is not particularly limited, and may be performed by a method well known to those skilled in the art.
In the invention, the PVC composite material comprises PVC resin, graphene and carbon nanotubes; the mass ratio of the graphene to the carbon nano tube to the PVC resin is preferably 10-20: 5-15: 65 to 85, more preferably 12 to 18: 8-12: 70-80.
In the present invention, the thickness of the coating layer obtained by coating is preferably 0.4 to 0.6mm, and more preferably 0.5 mm.
In the present invention, the coating is preferably a co-extrusion coating, and in the embodiment of the present invention, the coating is preferably performed in a coating mold.
The invention also provides the coal gangue-based self-temperature-adjusting wall prepared by the preparation method, and the self-temperature-adjusting wall preferably comprises a composite wall and a PVC composite material layer coated on the surface of the composite wall; the composite wall is preferably an inorganic foaming wall adsorbing a liquid phase-change material.
The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
Example 1
According to the mass parts, 5 parts of gypsum powder, 10 parts of casting sand, 10 parts of slag, 5 parts of portland cement, 70 parts of coal gangue powder, 2 parts of sodium bicarbonate, 4 parts of metal zinc and 25 parts of water are mixed to obtain a mixture.
And pouring the mixture into a foaming mould, foaming in a curing box at 50 ℃, wherein the foaming time is 4h, demoulding after foaming is finished, and then curing for 12h by steam at 100 ℃ to obtain the inorganic foaming wall with the width of 600mm, the thickness of 120mm and the length of 3000 mm.
And (2) soaking the inorganic foaming wall body (at the temperature of 50 ℃) in a liquid phase-change material (the mass ratio of solid paraffin to liquid paraffin to phase-change microcapsules is 40:35:25) for 0.5h, and adsorbing the phase-change material into an open pore structure in the inorganic foaming wall body to obtain the phase-change temperature-regulating wall body, wherein the adsorption capacity of the inorganic foaming wall body to the liquid phase-change material is 20% of the total mass of the coal gangue powder, the reinforcing agent and the adhesive (equivalent to 20 parts of the added liquid phase-change material).
After the surface of the obtained phase-change temperature-regulating wall body is scrubbed, the scrubbed surface is sent into a coating die, and then a layer of PVC composite material with the thickness of 0.4mm is coated on the surface of the phase-change temperature-regulating wall body (the mass ratio of PVC resin, graphene and carbon nano tubes in the PVC composite material is 85:10:5), so that the coal gangue-based self-temperature-regulating wall body is obtained.
The invention also tests the density, the latent heat of phase change and the heat conductivity coefficient of the coal gangue-based self-temperature-regulating wall prepared in the embodiment 1, and the test methods are respectively carried out according to GB/T13477.2-2018, JG/T534-2018 and GB/T3399-1982, and the test results are as follows:
the density of the coal gangue-based self-temperature-adjusting wall prepared in the embodiment 1 is 240kg/m 3 The latent heat of phase change is 170J/g, and the thermal conductivity of the coating layer is 1.60W/(m.K).
Example 2
According to the mass parts, 8 parts of gypsum powder, 12 parts of casting sand, 12 parts of slag, 8 parts of portland cement, 60 parts of coal gangue powder, 3 parts of sodium bicarbonate, 5 parts of metal zinc and 28 parts of water are mixed to obtain a mixture.
Pouring the mixture into a foaming mould, foaming in a curing box at 55 ℃ for 3.5h, demoulding after foaming, and performing steam curing at 120 ℃ for 10h to obtain an inorganic foaming wall body with the width of 600mm, the thickness of 120mm and the length of 3000 mm;
soaking the inorganic foaming wall body in a liquid phase-change material (the mass ratio of solid paraffin to liquid paraffin to phase-change microcapsules is 40:35:25) at the temperature of 60 ℃ for 1h, and adsorbing the phase-change material into an open pore structure in the inorganic foaming wall body to obtain the phase-change temperature-regulating wall body, wherein the adsorption capacity of the inorganic foaming wall body to the liquid phase-change material is 25% of the total mass of the gangue powder, the reinforcing agent and the adhesive (equivalent to the fraction of the added liquid phase-change material being 25 parts).
Scrubbing the surface of the obtained phase-change temperature-regulating wall, feeding the cleaned surface into a coating mould, and coating a layer of PVC composite material with the thickness of 0.5mm (the mass ratio of PVC resin, graphene and carbon nano tubes in the PVC composite material is 75:15:10) on the surface of the phase-change temperature-regulating wall to obtain the gangue-based self-temperature-regulating wall.
The density of the coal gangue-based self-temperature-adjusting wall prepared in the embodiment 2 is 225kg/m 3 The latent heat of phase change is 200J/g, and the thermal conductivity of the coating layer is 2.0W/(m.K).
Example 3
According to the mass parts, 10 parts of gypsum powder, 15 parts of casting sand, 15 parts of slag, 10 parts of portland cement, 50 parts of coal gangue powder, 3 parts of sodium bicarbonate, 5 parts of metal zinc and 30 parts of water are mixed to obtain a mixture.
Pouring the mixture into a foaming mould, foaming in a curing box at 60 ℃ for 3h, demoulding after foaming, and performing steam curing at 150 ℃ for 8h to obtain an inorganic foaming wall body with the width of 600mm, the thickness of 120mm and the length of 3000 mm;
soaking the inorganic foaming wall body in a liquid phase-change material (the mass ratio of solid paraffin to liquid paraffin to phase-change microcapsules is 40:35:25) for 2 hours at the temperature of 70 ℃, and adsorbing the phase-change material into an open pore structure in the inorganic foaming wall body to obtain the phase-change temperature-regulating wall body, wherein the adsorption capacity of the inorganic foaming wall body to the liquid phase-change material is 30% of the total mass of the gangue powder, the reinforcing agent and the adhesive (equivalent to the fraction of the added liquid phase-change material being 30 parts).
After the surface of the obtained phase-change temperature-regulating wall body is scrubbed, the scrubbed surface is sent into a coating die, and then a layer of PVC composite material with the thickness of 0.6mm is coated on the surface of the phase-change temperature-regulating wall body (the mass ratio of PVC resin, graphene and carbon nano tubes in the PVC composite material is 65:20:15), so that the coal gangue-based self-temperature-regulating wall body is obtained.
The density of the coal gangue-based self-temperature-regulating wall prepared in the embodiment 3 is 208kg/m 3 The latent heat of phase change is 240J/g, and the thermal conductivity of the coating layer is 3.2W/(m.K).
Fig. 1 is a schematic diagram of a coal gangue-based self-temperature-adjusting wall structure prepared in embodiments 1 to 3, wherein 1 represents an inorganic foaming wall, 2 represents a liquid phase-change material, and 3 represents a coating layer formed by a PVC composite material.
Comparative example 1
According to the mass parts, 10 parts of gypsum powder, 15 parts of casting sand, 15 parts of slag, 10 parts of portland cement, 50 parts of coal gangue powder, 3 parts of sodium bicarbonate, 5 parts of metal zinc, 30 parts of liquid phase-change material and 15 parts of water are mixed to obtain a mixture.
Pouring the mixture into a foaming mould, foaming in a curing box at 60 ℃ for 3h, demoulding after foaming, and performing steam curing at 150 ℃ for 8h to obtain an inorganic foaming wall body with the width of 600mm, the thickness of 120mm and the length of 3000 mm;
scrubbing the surface of the obtained phase-change temperature-regulating wall, feeding the cleaned surface into a coating mould, and coating a layer of PVC composite material with the thickness of 0.6mm (the mass ratio of PVC resin, graphene and carbon nano tubes in the PVC composite material is 65:20:15) on the surface of the phase-change temperature-regulating wall to obtain the gangue-based self-temperature-regulating wall.
The density of the coal gangue-based self-temperature-regulating wall prepared in the comparative example 1 is 160kg/m 3 The latent heat of phase change is 180J/g, and the heat conductivity coefficient of the coating layer is 3.2W/(m.K).
Comparative example 2
According to the mass parts, 10 parts of gypsum powder, 15 parts of casting sand, 15 parts of slag, 10 parts of portland cement, 50 parts of coal gangue powder, 3 parts of sodium bicarbonate, 5 parts of metal zinc and 30 parts of water are mixed to obtain a mixture.
Pouring the mixture into a foaming mould, foaming in a curing box at 60 ℃ for 3h, demoulding after foaming, and curing with steam at 150 ℃ for 8h to obtain an inorganic foaming wall with the width of 600mm, the thickness of 120mm and the length of 3000 mm;
and (2) soaking the inorganic foaming wall body (the temperature is 70 ℃) in a liquid phase-change material (the mass ratio of solid paraffin to liquid paraffin to phase-change microcapsules is 40:35:25) for 2 hours, and adsorbing the phase-change material into an open pore structure in the inorganic foaming wall body to obtain the phase-change temperature-regulating wall body, wherein the volume of the adsorbed liquid phase-change material is 30% of the mass of the inorganic foaming wall body.
The density of the phase-change temperature-regulating wall prepared in the comparative example 2 is 200kg/m 3 The latent heat of phase change was 225J/g, and the thermal conductivity of the surface layer was 1.25W/(mK).
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. The preparation method of the coal gangue-based self-temperature-regulating wall body is characterized by comprising the following steps of:
adding water into the coal gangue powder, the reinforcing agent, the initiator, the foaming agent and the adhesive for mixing to obtain a mixture;
sequentially foaming and maintaining the mixture to obtain an inorganic foaming wall;
soaking the inorganic foaming wall body in a liquid phase-change material to obtain a phase-change temperature-regulating wall body;
coating a PVC composite material on the surface of the phase-change temperature-regulating wall body to obtain the coal gangue-based self-temperature-regulating wall body;
the PVC composite material comprises PVC resin, graphene and carbon nanotubes;
the liquid phase-change material comprises solid paraffin, liquid paraffin and phase-change microcapsules.
2. The preparation method according to claim 1, wherein the mass ratio of the paraffin wax, the liquid paraffin wax and the phase-change microcapsule in the liquid phase-change material is 40:35: 25.
3. The preparation method of claim 1, wherein the mass ratio of the graphene to the carbon nanotube to the PVC resin in the PVC composite material is 10-20: 5-15: 65-85.
4. The method of claim 1, wherein the reinforcing agent is a mixture of landplaster, foundry sand and slag.
5. The preparation method according to claim 1 or 4, wherein the mass ratio of the gangue powder to the reinforcing agent is 50-70: 25-40.
6. The preparation method according to claim 1, wherein the mass ratio of the gangue powder to the binder is 50-70: 5-10.
7. The preparation method according to claim 1, wherein the adsorption capacity of the inorganic foaming wall to the liquid phase change material is 20-30% of the total mass of the gangue powder, the reinforcing agent and the adhesive.
8. The preparation method according to claim 1, wherein the soaking temperature is 50-70 ℃ and the soaking time is 0.5-2 h.
9. The preparation method according to claim 1, wherein the thickness of the coating layer obtained by coating is 0.4-0.6 mm.
10. The gangue-based self-temperature-regulating wall prepared by the preparation method of any one of claims 1 to 9, which is characterized in that the gangue-based self-temperature-regulating wall comprises a composite wall and a PVC composite material layer coated on the surface of the composite wall; the composite wall body is an inorganic foaming wall body which adsorbs liquid phase-change materials.
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