CN109626893B - Cement ceiling board with electromagnetic shielding function and semi-dry method preparation process thereof - Google Patents

Cement ceiling board with electromagnetic shielding function and semi-dry method preparation process thereof Download PDF

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CN109626893B
CN109626893B CN201910086775.8A CN201910086775A CN109626893B CN 109626893 B CN109626893 B CN 109626893B CN 201910086775 A CN201910086775 A CN 201910086775A CN 109626893 B CN109626893 B CN 109626893B
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cement
electromagnetic shielding
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ceiling board
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CN109626893A (en
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芦令超
闫振
李来波
赵丕琪
程新
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University of Jinan
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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
    • 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
    • C04B2111/00241—Physical properties of the materials not provided for elsewhere in C04B2111/00
    • C04B2111/00258—Electromagnetic wave absorbing or shielding 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
    • C04B2111/34—Non-shrinking or non-cracking materials
    • C04B2111/343—Crack resistant 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
    • 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
    • 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
    • C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
  • Building Environments (AREA)

Abstract

The invention belongs to the field of building materials, and particularly relates to a cement ceiling board with an electromagnetic shielding function and a semi-dry method preparation process thereof. The furred ceiling board includes carbon fiber net cloth and cement layer, carbon fiber net cloth is laid between the cement board, the cement layer includes: a material A and a solution B; the material A comprises the following components in parts by weight: 45-70 parts of cement, 3-7 parts of silica fume, 5-15 parts of fly ash and 0.3-1.5 parts of polyvinylpyrrolidone; the solution B comprises: 90-98 parts of water, 1-6 parts of a silane coupling agent and 0.05-0.15 part of ferroferric oxide modified graphene oxide. The invention provides a formula of a cement ceiling board and a semi-dry method preparation process adapted to the formula based on the problems in the field of using the existing cement-based material as the ceiling board.

Description

Cement ceiling board with electromagnetic shielding function and semi-dry method preparation process thereof
Technical Field
The invention belongs to the field of building materials, and particularly relates to a cement ceiling board with an electromagnetic shielding function and a semi-dry method preparation process thereof.
Background
With the rapid development of the current communication technology, the problem of electromagnetic radiation pollution gradually gets attention of people, and particularly around high-voltage and ultrahigh-voltage power transmission lines, strong electromagnetic radiation can be generated when equipment runs around a high-voltage transformer, so that great harm is generated to the daily life of nearby residents. Electromagnetic wave radiation can have adverse effects on the visual system, immune system and nerve center of people, so that memory of people is unconsciously declined, work and life are affected, nerve disorder is seriously caused, and great harm is caused to the mind and body of people. Therefore, electromagnetic shielding is a focus of important attention, and particularly, building materials having an electromagnetic shielding function are gradually favored in current home decoration.
However, the existing electromagnetic shielding decorative materials for interior decoration have few types and poor mechanical properties, and cannot meet the mechanical properties required by interior and exterior decoration, so that the interior decorative materials with electromagnetic shielding function and excellent mechanical properties are in the blank in the market. The application of the ceiling tiles in interior decoration is very wide, and the existing ceiling tiles are mainly classified into gypsum ceiling tiles for decoration, metal composite ceiling tiles and organic polymer ceiling tiles.
The decorative gypsum board ceiling board is made up by using gypsum as main raw material, adding fibre, adhesive and modifying agent, mixing, pressing and drying, and has the excellent properties of fire-proofing, sound-proofing, heat-insulating, light weight, ageing-proofing and moth-proofing, etc.. Patent document 201721897684.5 discloses a thistle board decorative wall, its characterized in that: the iron plate is fastened on the wall body through expansion bolts, and the paper-faced gypsum board is adsorbed on the iron plate through the magnetic force of the first magnet; the seam installed part is arranged in the splicing seam between the adjacent paper-faced gypsum boards, the seam installed part comprises a pressing plate, a fixed plate, two end plates, a second magnet, a telescopic column and a spring, the second magnet is adsorbed on the iron plate, the pressing plate is pressed on the outer surfaces of the paper-faced gypsum boards on two sides of the splicing seam, two ends of the telescopic column penetrate through holes of the fixed plate and are connected with one end plate, and each piece of the fixed plate is sleeved with one spring on the telescopic column between the end plate and the fixed plate. The gypsum plaster board in this patent document is adsorbed on the iron plate on the wall surface by the magnetic force of the magnet, and the joint installation piece is installed at the splicing seam part and also adsorbed on the iron plate on the wall surface by the magnetic force of the magnet. However, the invention considers that the gypsum board is used as a decorative wall in the patent, but the gypsum board is easy to absorb moisture and wet, so that the gypsum board is easy to deform, and the use of the gypsum board in Jianghuai and southern humid areas of China is greatly limited.
Patent document 201410060591.1 discloses a composite metal ceiling comprising: the keel is fixed with the wall top and is suspended and fixed a suspender of the keel, the metal decorative plate, a hanging piece arranged on the keel, one end of the hanging piece fixed with the hanging piece, and the other end of the connecting and fixing piece fastened with the metal decorative plate. However, the present invention recognizes that the metal ceiling plate is not moisture resistant, does not absorb moisture, is easily rusted and corroded in a humid environment, and is deformed, thereby causing a safety problem. And the metal ceiling has more complex manufacturing process and higher manufacturing cost, so the popularization rate is lower.
Patent document 201410358088.4 discloses a continuous fiber reinforced thermoplastic polymer temperature-adjusting plate, which mainly comprises: the honeycomb energy storage material comprises a panel, a bottom plate, a honeycomb core layer and a phase change energy storage material filled in the honeycomb core layer. The panel, the bottom plate and the honeycomb core layer are made of sheets of continuous fiber reinforced thermoplastic polymer composite materials filled with modified heat-conducting fillers, the honeycomb core layer phase change energy storage materials are filled in a plurality of mutually independent cavities in the honeycomb core layer, and the panel and the bottom plate are respectively compounded with the upper surface and the lower surface of the honeycomb core layer through hot melting. The high-thermal-conductivity continuous fiber reinforced thermoplastic polymer panel is prepared by blending a high-thermal-conductivity substance and a polymer through a double-sided membrane spraying method, and has high specific modulus and specific strength. The honeycomb core is made of the same material as the panel, and the honeycomb core and the panel are fused and bonded and firmly combined. Phase change material is filled in the honeycomb holes, the addition amount is large, and the problem of phase change material precipitation is effectively avoided. However, the invention considers that the application field of the invention is mainly the decoration of indoor decorative suspended ceilings and wall surfaces. However, the organic polymer ceiling tiles generally have the problems of fire resistance, low safety, aging resistance, ultraviolet irradiation resistance and the like. And the organic polymer plate has high cost and is not suitable for large-scale use.
The cement-based material has the advantages of excellent fire resistance, ultraviolet aging resistance, good moisture absorption and moisture resistance, no deformation, low production cost and the like, and theoretically, the cement board has the potential of becoming a cement ceiling board with the electromagnetic shielding function. However, cement-based materials have a high density, a high compressive strength, and a low flexural strength, and therefore, when a cement board is directly used as a ceiling tile, the cement board has a heavy mass per unit area and a low breaking load. Therefore, the existing cement-based plate is a porous hardened body, the porosity of the existing cement-based plate is as high as 20-40%, and the method has the problems of high porosity, low density, low fracture resistance, poor mechanical property and the like. This in turn virtually limits the potential for cementitious materials as ceiling tiles. Therefore, there is a need to develop new cement suitable for ceiling tiles and a method for preparing the same.
Disclosure of Invention
In order to solve the problems of the cement-based material used as the ceiling board, the invention provides the cement ceiling board with the electromagnetic shielding function and the semidry method preparation process thereof. The electromagnetic shielding cement ceiling tile has low unit area weight and high breaking load, and can completely meet the use requirement of a decorative ceiling tile.
The invention aims to provide a cement ceiling board with an electromagnetic shielding function.
The second purpose of the invention is to provide a preparation method of the cement ceiling tile with the electromagnetic shielding function.
The invention also provides a cement ceiling board with the electromagnetic shielding function and an application of the preparation method.
In order to realize the purpose, the invention discloses the following technical scheme:
the invention discloses a cement ceiling board with an electromagnetic shielding function, which comprises carbon fiber gridding cloth and a cement layer, wherein the carbon fiber gridding cloth is paved between cement boards to form the electromagnetic shielding cement ceiling board with an upper layer structure, a middle layer structure and a lower layer structure; the cement layer includes: a material A and a solution B; the material A comprises the following raw materials in parts by weight: 45-70 parts of cement, 3-7 parts of silica fume, 5-15 parts of fly ash and 0.3-1.5 parts of polyvinylpyrrolidone (PVP); the solution B comprises the following raw materials: 90-98 parts of water and silane coupling1-6 parts of coupling agent and ferroferric oxide modified graphene oxide (GO-Fe)3O4)0.05 to 0.15 portion.
Furthermore, the thickness of the electromagnetic shielding cement ceiling board is 2-5 mm. Because of the limitation of the application environment of the ceiling board, the ceiling board is required to have lower weight and thickness, for example, the thickness wall board of the ceiling board cannot exceed 10mm, but the fracture load of the cement ceiling board with the thickness is lower and the breaking strength is lower, so that the weight of the ceiling board is overlarge due to the increase of the thickness of the cement ceiling board, the ceiling board is not easy to process and install in the installation process, and the ceiling board is easy to fall off due to overlarge weight after installation; therefore, the carbon fiber mesh cloth is laid between the cement ceiling tiles when the cement ceiling tiles are prepared, so that the prepared cement ceiling tiles have good bending strength under the condition of ensuring that the thickness of the cement ceiling tiles is relatively thin, the problem that the cement ceiling tiles are easy to break during processing can be solved, the bending strength requirement of the ceiling tiles can be met under the condition that the thickness dimension meets the requirement of the ceiling tiles, and the prepared cement ceiling tiles have the characteristics of light weight, large breaking load, easiness in processing and installation.
The carbon fiber mesh cloth has conductivity and can increase the electromagnetic shielding efficiency of the cement ceiling board when being uniformly paved between the cement boards as the interlayer, but the carbon fiber mesh cloth has the condition that a small amount of electromagnetic leakage exists in a cavity, and other components are required to be added for further improving the electromagnetic shielding efficiency of the cement ceiling board. According to the invention, ferroferric oxide modified graphene oxide is added in the preparation process, and the ferroferric oxide modified graphene oxide and the carbon fiber mesh cloth together play an electromagnetic shielding effect. In addition, the carbon fiber also has excellent mechanical property, and the interlayer material is made in the middle of the cement ceiling board, so that the breaking strength of the cement ceiling board can be greatly improved, and the mechanical bearing property of the cement board is improved.
Meanwhile, the GO-Fe obtained by modifying graphene oxide with ferroferric oxide in the components of the cement board3O4The modified graphene oxide can obviously improve the surface roughness of the graphene oxide, greatly increase the contact area of the cement composition and the carbon fiber mesh cloth, and avoid electromagnetic shielding suspended ceiling in the processing processLayering the plates; and the prepared cement ceiling board has good battery shielding performance.
Furthermore, the mesh size of the carbon fiber mesh cloth is 5-10 mm multiplied by 5-10 mm. The carbon fiber mesh cloth net with the mesh size can enable cement-based materials to form better contact between the mesh cloth, and avoids the phenomenon that the upper layer and the lower layer of cement are not contacted to cause layering, so that the mechanical property is reduced. In addition, the carbon fiber mesh cloth can play a strong electromagnetic shielding role in the middle of the cement layer,
further, the content of ferroferric oxide in the ferroferric oxide modified graphene oxide solution is 2-6% by mole fraction; namely, every 100mol of graphene oxide is loaded with 2-6 mol of ferroferric oxide.
Further, GO-Fe3O4The preparation method comprises the following steps: mixing Fe3O4Adding the mixture into a graphene oxide solution, and heating the obtained mixed solution in water bath to enable Fe3O4Grafting to functional groups on the surface of graphene oxide to obtain Fe3O4Modified graphene oxides, i.e. GO-Fe3O4。
Preferably, the reaction solution is stirred during the water bath heating process, because the water bath heating can promote Fe3O4And the graphene oxide is bonded with the graphene oxide, and the graphene oxide can be effectively prevented from agglomerating by stirring.
Further, the temperature of the water bath heating is kept at 45-65 ℃; the stirring mode is magnetic stirring, and the stirring speed is 30-70 r/min.
The graphene oxide is a two-dimensional material, the dimension of the graphene oxide in the plane direction is micron grade, the dimension of the graphene oxide in the vertical direction is nano grade, and meanwhile, the graphene oxide has good flexibility, so that the graphene oxide is used as a toughening material for preparing a cement ceiling board to increase the flexibility of the ceiling board, and the ceiling board can deform more or less due to the self weight after being installed, however, the graphene oxide has a smooth surface, low roughness, weak combination with cement hydration products and poor use effect, and therefore, the graphene oxide has the advantages of smooth surface, low roughness, and poor use effectUsing Fe3O4Modification of graphene oxide surface, Fe3O4The surface roughness of graphene oxide can be effectively increased, the surface area of the graphene oxide is increased, the bonding strength of the graphene oxide and cement hydration products is further enhanced, the graphene oxide can more fully play a two-dimensional bridging effect, and the breaking strength of the cement ceiling board is enhanced. Meanwhile, the ferroferric oxide also has good electromagnetic shielding performance, so that the prepared cement ceiling board has the capability of shielding electromagnetic wave radiation. In addition, the modified graphene oxide can replace fibers to serve as a toughening material, so that the problems of high fiber price and the like are solved.
Furthermore, the particle size of the silica fume is less than 1 μm and exceeds 90%, and the main component of the silica fume is SiO2Therefore, the silica fume has strong volcanic ash activity, can generate a gelled substance in the alkaline environment of cement to improve the mechanical property of the cement board, and can fill the pores generated by the accumulation of the cement particle size because the silica fume particle size is far smaller than the cement particle size to form particle grading, reduce the porosity of the cement board and improve the density of the cement board.
Further, the fly ash has a particle size of 200 meshes and a specific surface area of 240-330 m, wherein the residual content of the fly ash is less than 10 percent2Kg, the fly ash is solid waste generated by burning coal, and the fly ash contains active SiO2And Al2O3Can generate hydration reaction in the alkaline environment of cement to generate a cementing material, plays a certain role in enhancing the strength of the cement,
in addition, the three raw materials of the silica fume, the fly ash and the cement designed by the invention can also generate good particle matching effect to form a particle accumulation effect, so that the density of material accumulation can be effectively improved, and the mechanical property of the cement board is further improved. In addition, the silica fume and the fly ash have small particle size, hydration activity, particle stacking effect and hydration characteristic, and can react in the hydration process to generate hydrated calcium silicate gel with good mechanical property.
Further, the silane coupling agent is KH550 type, KH550 is amino type silane coupling agent, the siloxy group has reactivity to inorganic substances, and the organic functional group has reactivity or compatibility to organic substances. Thus, when a silane coupling agent is interposed between the inorganic and organic interfaces, a bonding layer of organic matrix to silane coupling agent to inorganic matrix may be formed. The interface strength of the polymer and the inorganic matrix can be effectively enhanced, the stability of the matrix is improved, and the flexural strength of the cement ceiling board is further improved.
Further, the molecular weight of the polyvinylpyrrolidone (PVP) is 1.3 × 104～3.0×104. Because PVP is water-soluble high molecular polymer, in the high-temperature maintenance process of the cement ceiling board blank, PVP can form a cross-linked network structure, the breaking strength of the cement ceiling board can be effectively enhanced, and the cracking of the cement ceiling board can be reduced.
Further, the cement is portland cement, preferably PO42.5R. The Portland cement can meet the requirement of preparing the cement ceiling tiles, and is low in price, so that the preparation cost of the ceiling tiles can be maintained at a low level.
The invention further provides a semidry method preparation process of the cement ceiling tile with the electromagnetic shielding function, which comprises the following steps of:
(1) adding the powdery material A into a mould of the electromagnetic shielding cement ceiling board layer by layer, and spraying a solution B on the material A after each layer of the powdery material A is added; when the number of the material A layers reaches a set number, laying carbon fiber mesh cloth on the material A, then continuously laying the material A on the surface of the carbon fiber mesh cloth, and performing pressure forming after the material A is finished to obtain an electromagnetic shielding cement ceiling board blank;
(2) and maintaining and drying the blank plate of the electromagnetic shielding cement ceiling board to obtain the electromagnetic shielding cement ceiling board.
Compared with the wet preparation method adopting cement slurry, the semi-dry preparation process provided by the invention can well realize uniform mixing of cement and water under the condition of low water ratio, reduce the water content of the cement ceiling board blank, and well solve the problem that the performance of the final electromagnetic shielding cement ceiling board is adversely affected by overhigh or overlow water content in the wet preparation process of the cement ceiling board.
In the step (1), the thickness of each layer of the material A is 0.3-1.0 mm, and the number of the material layers is 5-12.
In the step (1), the spraying amount of the solution B is 0.10-0.25 kg/m2And the size of the atomized particles of the solution B is set to be 20-45 mu m during spraying.
In the step (1), the forming pressure is set to be 10-55 MPa, and the pressure maintaining time is set to be 10-35 min.
In the step (2), the curing is steam curing, the curing temperature is set to be 40-65 ℃, and the curing time is set to be 4-18 hours.
In the step (2), the drying conditions are as follows: the drying temperature is not more than 62 ℃, and the drying time is 0.5-3 h.
Finally, the invention discloses the application of the cement ceiling tile with the electromagnetic shielding function and the semidry method preparation process thereof in the field of building engineering.
Compared with the prior art, the invention has the following beneficial effects:
(1) the invention provides a novel cement ceiling board formula and a semi-dry method preparation process adaptive to the formula based on the problems in the field of using the existing cement-based material as a ceiling board.
(2) According to the invention, the ferroferric oxide is used for modifying the graphene oxide, so that the surface area and the surface roughness of the graphene oxide are effectively increased, the bonding strength of the graphene oxide and a cement hydration product is further enhanced, the graphene oxide can more fully exert the two-dimensional bridging effect, the breaking strength of a cement ceiling board is effectively enhanced, and the ferroferric oxide has certain magnetism and better performance on electromagnetic shielding.
(3) According to the invention, the carbon fiber mesh cloth is laid in the middle of the cement board when the cement ceiling board is prepared, so that the electromagnetic shielding layer is formed inside the cement-based board, and in addition, under the condition that the prepared cement ceiling board is relatively thin, the carbon fiber mesh cloth can form a mesh structure, so that the cement board has good bending strength, and the problem that the cement board is easy to break during processing is avoided, so that cement can be used for manufacturing the ceiling board, and the prepared ceiling board is light in weight and easy to process and install.
(4) GO-Fe obtained by modifying graphene oxide with ferroferric oxide3O4The surface roughness of the graphene oxide can be obviously improved, the contact area of the cement composition and the carbon fiber mesh cloth is greatly increased, and the electromagnetic shielding ceiling board is prevented from being layered in the machining process.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application.
FIG. 1 is a schematic structural view of an electro-magnetic shielding cement ceiling tile produced in accordance with examples 2-12 of the present invention; wherein 1 denotes a cement layer, and 2 denotes a carbon fiber mesh cloth.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
As described in the background art, the existing interior material has fewer materials with electromagnetic shielding function, and fewer electromagnetic shielding interior materials with better mechanical properties are available in the market. In the field of interior trim ceiling tiles, such as: gypsum ceiling boards, metal composite ceiling boards and organic polymer ceiling boards have some problems, for example, gypsum boards are easy to deform due to moisture absorption, and the application and the service life of the gypsum ceiling boards in southern areas of China are severely limited; the metal ceiling board has the defects of no moisture absorption, easy condensation of water drops on the surface of the metal ceiling board, easy deformation of the ceiling board in processing and transportation, high production cost, easy aging of a surface protection layer and the like; the organic polymer ceiling board generally has the defects of no fire resistance, low safety, great environmental pollution caused by production, manufacture and recovery, high production cost, no ultraviolet aging resistance and the like. Therefore, the invention provides a cement ceiling tile with an electromagnetic shielding function and a semi-dry method preparation process thereof, and the invention is further explained by combining the attached drawings and the detailed implementation mode.
In the following examples, the cement was obtained from Shandong Cement Mill Ltd under the model number PO42.5R Portland cement. The silica fume is purchased from Shandong Zibo Ken Si Co., Ltd, and the specification is as follows: the silica fume contains particles with particle diameter less than 1 μm more than 90%, and SiO as main ingredient2. The fly ash is purchased from Shandong Yongfeng Steel Co Ltd, and the specification of the fly ash is as follows: the particle size is 200 meshes, the residue is less than 10 percent, and the specific surface area is 240-330 m2Between/kg.
Example 1
The cement ceiling board is prepared from cement as a raw material, and the preparation process comprises the following steps:
(1) adding the cement into a homogenizing pool according to the water cement ratio of 2.8, and uniformly stirring to obtain cement slurry;
(2) injecting the cement slurry obtained in the step (1) into a felt mold, and pressurizing, dehydrating and molding the slurry after the injection is finished, wherein the molding pressure is set to be 60MPa, and the pressure maintaining time is 10min, so as to obtain a cement ceiling board blank;
(3) and (3) placing the cement blank plate obtained in the step (2) in a steam curing chamber for steam curing for 12 hours, setting the curing temperature to be 50 ℃, and then placing the obtained hardened cement blank plate in a drying environment at the temperature of 50 ℃ for drying for 3 hours to obtain the cement ceiling board.
Example 2
1. A cement ceiling board is shown in figure 1 and is composed of cement layers 1 and carbon fiber gridding cloth 2, wherein the carbon fiber gridding cloth 2 is laid between the cement layers 1 to form an electromagnetic shielding cement ceiling board composed of an upper layer structure, a middle layer structure and a lower layer structure: the mesh size of the carbon fiber mesh cloth is 5mm multiplied by 5 mm.
2. The method for preparing the cement ceiling tile comprises the following steps:
(1) adding the cement into a homogenizing pool according to the water cement ratio of 3, and uniformly stirring to obtain cement slurry;
(2) injecting the cement slurry obtained in the step (1) into a felt mold, paving the carbon fiber mesh cloth to the surface of the slurry when half of the slurry is injected, then continuing injecting the rest slurry into the surface of the carbon fiber mesh cloth, and performing pressure dehydration molding after the completion, wherein the molding pressure is 60MPa, and the pressure maintaining time is 10min, so as to obtain a cement ceiling board blank;
(3) and (3) placing the cement blank plate obtained in the step (2) in a steam curing chamber for steam curing for 12 hours, setting the curing temperature to be 50 ℃, and then placing the obtained hardened cement blank plate in a drying environment at the temperature of 50 ℃ for drying for 3 hours to obtain the cement ceiling board.
Example 3
1. An electromagnetic shielding cement ceiling board is shown in figure 1 and comprises cement layers 1 and carbon fiber gridding cloth 2, wherein the carbon fiber gridding cloth 2 is laid between the cement layers 1 to form the electromagnetic shielding cement ceiling board consisting of an upper layer structure, a middle layer structure and a lower layer structure.
Wherein the mesh size of the carbon fiber mesh cloth is 5mm multiplied by 5 mm. The cement layer 1 is prepared from a powdery material A and a solution B, wherein the powdery material A is prepared from the following raw materials in parts by weight: 55 parts of cement, 4 parts of silica fume, 6 parts of fly ash and polyvinylpyrrolidone (molecular weight is 2.0 multiplied by 10)4)1.0 part.
The solution B is prepared from the following raw materials in parts by weight: 98 parts of water, 1.6 parts of KH550 type silane coupling agent and 0.14 part of ferroferric oxide modified graphene oxide, wherein the components are mixed; the GO-Fe3O4The loading amount of the medium ferroferric oxide is 3.5 percent (mole fraction), namely 3.5mol of ferroferric oxide is added into every 100mol of graphene oxide.
The preparation method of the ferroferric oxide modified graphene oxide comprises the following steps: (1) diluting the graphene oxide solution to 0.45mg/ml, then adding ferroferric oxide into the graphene oxide solution according to a proportion, and placing the obtained mixed solution into a magnetic stirrer with a water bath heating function to stir and heat, wherein the heating temperature is 50 ℃, and the stirring speed is 50 r/min.
2. The method for preparing the electromagnetic shielding cement ceiling tile comprises the following steps:
(1) adding the powdery materials A into a cement ceiling mould layer by layer, wherein the thickness of each layer of the materials A is 1.0mm, and spraying a solution B onto the materials A by a sprayer after each layer of the powdery materials A is added; the spraying amount of the solution B is 0.2kg/m2Setting the size of atomized particles to be 20-45 mu m, and then carrying out pressure forming under the forming pressure of 20MPa for 20 min; the number of the material layers is 8.
(3) And (3) placing the electromagnetic shielding cement ceiling board blank plate obtained in the step (2) in a steam curing chamber for steam curing for 10 hours, setting the curing temperature to be 50 ℃, and after the curing is finished, placing the hardened electromagnetic shielding cement ceiling board blank plate in a drying environment at the temperature of 45 ℃ for drying for 2 hours to obtain the electromagnetic shielding cement ceiling board.
Example 4
1. An electromagnetic shielding cement ceiling board is shown in figure 1 and comprises a cement layer 1 and carbon fiber gridding cloth 2, wherein the carbon fiber gridding cloth 2 is laid between the cement layer 1, and the electromagnetic shielding cement ceiling board consisting of an upper layer structure, a middle layer structure and a lower layer structure is formed.
Wherein the mesh size of the carbon fiber mesh cloth is 8mm multiplied by 10 mm. The electromagnetic shielding cement layer 1 is prepared from a powdery material A and a solution B, wherein the powdery material A is prepared from the following raw materials in parts by weight: 60 portions of Portland cement, 7 portions of silica fume, 8 portions of fly ash and polyvinylpyrrolidone (molecular weight is 3.0 multiplied by 10)4)1.0 part.
The solution B is prepared from the following raw materials in parts by weight: 95 parts of water, 2 parts of KH550 type silane coupling agent and 0.05 part of ferroferric oxide modified graphene oxide, wherein the components are mixed; the GO-Fe3O4Intermediate tetroxideThe loading amount of the iron is 5 percent (mole fraction), namely, 5mol of ferroferric oxide is added into every 100mol of graphene oxide.
The preparation method of the graphene oxide loaded ferroferric oxide comprises the following steps: (1) diluting the graphene oxide solution to 0.5mg/ml, then adding ferroferric oxide into the graphene oxide solution according to a proportion, placing the obtained mixed solution into a magnetic stirrer with a water bath heating function, stirring and heating, wherein the heating temperature is 65 ℃, and the stirring speed is 70 r/min.
2. The method for preparing the electromagnetic shielding cement ceiling tile comprises the following steps:
(1) adding the powdery materials A into a cement ceiling mould layer by layer, wherein the thickness of each layer of the materials A is 0.5mm, and spraying a solution B onto the materials A by a sprayer after each layer of the powdery materials A is added; the spraying amount of the solution B is 0.25kg/m2Setting the size of atomized particles to be 20-45 mu m, laying the carbon fiber mesh cloth on the material A when the number of cloth layers of the material A is half, then continuously adding the material A on the surface of the carbon fiber mesh cloth, and carrying out pressure forming after the completion, wherein the forming pressure is 55MPa, and the pressure maintaining time is 10 min; the number of the material layers is 10.
(3) And (3) placing the electromagnetic shielding cement ceiling board blank obtained in the step (2) in a steam curing chamber for steam curing for 18 hours, setting the curing temperature to be 40 ℃, and after the curing is finished, placing the hardened electromagnetic shielding cement ceiling board blank in a drying environment at the temperature of 30 ℃ for drying for 3 hours to obtain the electromagnetic shielding cement ceiling board.
Example 5
1. An electromagnetic shielding cement ceiling board is shown in figure 1 and comprises a cement layer 1 and carbon fiber gridding cloth 2, wherein the carbon fiber gridding cloth 2 is laid between the cement layer 1, and the electromagnetic shielding cement ceiling board consisting of an upper layer structure, a middle layer structure and a lower layer structure is formed.
Wherein the mesh size of the carbon fiber mesh cloth is 10mm multiplied by 8 mm. The electromagnetic shielding cement layer 1 is prepared from a powdery material A and a solution B, wherein the powdery material A is prepared from the following raw materials in parts by weight: 70 parts of Portland cement, 7 parts of silica fume, 15 parts of fly ash and polyvinylpyrrolidone (molecular weight is 1.3 multiplied by 10)4)0.3 part.
The solution B is prepared from the following raw materials in parts by weight: 92 parts of water, 1 part of KH550 type silane coupling agent and 0.15 part of ferroferric oxide modified graphene oxide, wherein the components are mixed; the GO-Fe3O4The loading amount of the medium ferroferric oxide is 6 percent (mole fraction), namely 6mol of ferroferric oxide is added into every 100mol of graphene oxide.
The preparation method of the graphene oxide loaded ferroferric oxide comprises the following steps: (1) diluting the graphene oxide solution to 0.4mg/ml, then adding ferroferric oxide into the graphene oxide solution according to a proportion, placing the obtained mixed solution into a magnetic stirrer with a water bath heating function, stirring and heating, wherein the heating temperature is 45 ℃, and the stirring speed is 30 r/min.
2. The method for preparing the electromagnetic shielding cement ceiling tile comprises the following steps:
(1) adding the powdery materials A into a cement ceiling mould layer by layer, wherein the thickness of each layer of the materials A is 0.3mm, and spraying a solution B onto the materials A by a sprayer after each layer of the powdery materials A is added; the spraying amount of the solution B is 0.15kg/m2Setting the size of atomized particles to be 20-45 mu m, laying the carbon fiber mesh cloth on the material A when the number of cloth layers of the material A is half, then continuously adding the material A on the surface of the carbon fiber mesh cloth, and carrying out pressure forming after the completion, wherein the forming pressure is 25MPa, and the pressure maintaining time is 25 min; the number of the material layers is 12.
(3) And (3) placing the electromagnetic shielding cement ceiling board blank obtained in the step (2) in a steam curing chamber for steam curing for 8 hours, setting the curing temperature to be 45 ℃, and after the curing is finished, placing the hardened electromagnetic shielding cement ceiling board blank in a drying environment at 62 ℃ for drying for 0.5 hour to obtain the electromagnetic shielding cement ceiling board.
Example 6
1. An electromagnetic shielding cement ceiling board is shown in figure 1 and comprises a cement layer 1 and carbon fiber gridding cloth 2, wherein the carbon fiber gridding cloth 2 is laid between the cement layer 1, and the electromagnetic shielding cement ceiling board consisting of an upper layer structure, a middle layer structure and a lower layer structure is formed.
Wherein the carbon isThe mesh size of the fiber mesh cloth is 5mm multiplied by 10 mm. The electromagnetic shielding cement layer 1 is prepared from a powdery material A and a solution B, wherein the powdery material A is prepared from the following raw materials in parts by weight: 45 parts of Portland cement, 3 parts of silica fume, 5 parts of fly ash and polyvinylpyrrolidone (molecular weight is 1.5 multiplied by 10)4)1.5 parts.
The solution B is prepared from the following raw materials in parts by weight: 90 parts of water, 6 parts of KH550 type silane coupling agent and 0.12 part of ferroferric oxide modified graphene oxide, wherein the components are mixed; the GO-Fe3O4The loading amount of the medium ferroferric oxide is 2 percent (mole fraction), namely 2mol of ferroferric oxide is added into every 100mol of graphene oxide.
The preparation method of the graphene oxide loaded ferroferric oxide comprises the following steps: (1) diluting the graphene oxide solution to 0.3mg/ml, then adding ferroferric oxide into the graphene oxide solution according to a proportion, placing the obtained mixed solution into a magnetic stirrer with a water bath heating function, stirring and heating, wherein the heating temperature is 60 ℃, and the stirring speed is 30 r/min.
2. The method for preparing the electromagnetic shielding cement ceiling tile comprises the following steps:
(1) adding the powdery materials A into a cement ceiling mould layer by layer, wherein the thickness of each layer of the materials A is 1.0mm, and spraying a solution B onto the materials A by a sprayer after each layer of the powdery materials A is added; the spraying amount of the solution B is 0.10kg/m2Setting the size of atomized particles to be 20-45 mu m, laying the carbon fiber mesh cloth on the material A when the number of cloth layers of the material A is half, then continuously adding the material A on the surface of the carbon fiber mesh cloth, and carrying out pressure forming after the completion, wherein the forming pressure is 10MPa, and the pressure maintaining time is 35 min; the number of the material layers is 5.
(3) And (3) placing the electromagnetic shielding cement ceiling board blank obtained in the step (2) in a steam curing chamber for steam curing for 4 hours, setting the curing temperature to 65 ℃, and after the curing is finished, placing the hardened electromagnetic shielding cement ceiling board blank in a drying environment at the temperature of 40 ℃ for drying for 2 hours to obtain the electromagnetic shielding cement ceiling board.
Example 7
An electromagnetic shielding cement ceiling board, which is the same as embodiment 3 except that: the solution B does not contain ferroferric oxide modified graphene oxide.
Example 8
An electromagnetic shielding cement ceiling board, which is the same as embodiment 3 except that: graphene oxide in the solution B is not modified by ferroferric oxide; the method specifically comprises the following steps: the solution B is prepared from the following raw materials in parts by weight: 98 parts of water, 1.6 parts of KH550 type silane coupling agent and 0.14 part of graphene oxide.
Example 9
An electromagnetic shielding cement ceiling board, which is the same as embodiment 4 except that: the powdery material A does not contain polyvinylpyrrolidone.
Example 10
An electromagnetic shielding cement ceiling board, which is the same as example 5 except that: the powdery material A does not contain silica fume and fly ash.
Example 11
An electromagnetic shielding cement ceiling board, which is the same as example 6 except that: tap water was used instead of the solution B.
Example 12
An electromagnetic shielding cement ceiling board, as in example 6, wherein the mesh size of the carbon fiber mesh cloth is 12mm × 12 mm.
And (3) performance detection:
(1) the electromagnetic shielding efficiency of the cement boards prepared in the embodiments 1 to 7 is tested, and the method specifically comprises the following steps: the electromagnetic shielding transmission coefficient curve of the sample in the range of 100MHz to 1GHz was scanned by an Aglient HP4291B impedance analyzer, and the results are shown in Table 1.
TABLE 1
Figure BDA0001962021640000111
Figure BDA0001962021640000121
(2) The unit area weight and the breaking load of the electromagnetic shielding cement ceiling board prepared by the invention are measured by referring to the measuring method for the thickness, the unit area weight and the breaking load of the ceiling gypsum board specified in JC/T799-2007 decorative gypsum board, and the results are shown in Table 2.
TABLE 2
Figure BDA0001962021640000122
As can be seen from table 1, compared to examples 1 and 7 to 12, the cement ceiling tiles prepared in examples 2 to 6 have an average electromagnetic shielding efficiency of 50dB or more at a frequency of 1GHz, and exhibit excellent electromagnetic shielding performance. As can be seen from Table 2, the weight per unit area and the breaking load of the cement ceiling tiles prepared in examples 2 to 6 are far better than those of the cement ceiling tiles prepared in examples 1 and 7 to 12, mainly because the formula of the ceiling tile and the semi-dry preparation process provided by the invention are adopted.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (13)

1. The cement ceiling board with the electromagnetic shielding function is characterized by comprising carbon fiber gridding cloth and a cement layer, wherein the carbon fiber gridding cloth is paved among the cement boards to form the electromagnetic shielding cement ceiling board with an upper layer structure, a middle layer structure and a lower layer structure; wherein:
the cement layer includes: a material A and a solution B; the material A comprises the following raw materials in parts by weight: 45-70 parts of cement, 3-7 parts of silica fume, 5-15 parts of fly ash and 0.3-1.5 parts of polyvinylpyrrolidone; the solution B comprises the following raw materials: 90-98 parts of water, 1-6 parts of a silane coupling agent and 0.05-0.15 part of ferroferric oxide modified graphene oxide;
the thickness of the cement ceiling plate is 2-5 mm.
2. The cement ceiling tile according to claim 1, wherein the mesh size of the carbon fiber mesh cloth is 5 to 10mm x 5 to 10 mm.
3. The cementitious ceiling tile of claim 1, wherein: the content of ferroferric oxide in the ferroferric oxide modified graphene oxide solution is 2-6% by mole fraction.
4. The cement ceiling tile of claim 1, wherein the preparation method of the ferroferric oxide modified graphene oxide comprises the following steps: and adding ferroferric oxide into the graphene oxide solution, and then heating the obtained mixed solution in a water bath to obtain the graphene oxide.
5. The cement ceiling tile of claim 4, wherein the reaction solution is stirred during the water bath heating.
6. The cement ceiling tile as recited in claim 5, wherein the temperature of the water bath heating is maintained between 45 ℃ and 65 ℃; the stirring mode is magnetic stirring, and the stirring speed is 30-70 r/min.
7. The cementitious ceiling tile of claim 1 wherein the silica fume has particles of less than 1 μm in size greater than 90% and the silica fume is comprised of SiO as the major component2；
Or the particle size of the fly ash is less than 10 percent after 200 meshes, and the specific surface area is 240-330 m2/kg；
Or, the silane coupling agent is KH550 type;
alternatively, the polyvinylpyrrolidone has a molecular weight of 1.3 × 104～3.0×104。
8. The cementitious ceiling tile of claim 1, wherein said cement is portland cement.
9. The cementitious ceiling tile of claim 8, wherein said cement is PO42.5R.
10. The semi-dry process for preparing a cement ceiling tile with an electromagnetic shielding function according to any one of claims 1 to 9, comprising the steps of:
(1) adding the powdery material A into a mould of the electromagnetic shielding cement ceiling board layer by layer, and spraying a solution B on the material A after each layer of the powdery material A is added; when the number of the material A layers reaches a set number, laying the carbon fiber mesh cloth on the material A, then continuing to lay the material A on the surface of the carbon fiber mesh cloth, and performing compression molding after finishing to obtain an electromagnetic shielding cement ceiling board blank;
(2) and maintaining and drying the blank plate of the electromagnetic shielding cement ceiling board to obtain the electromagnetic shielding cement ceiling board.
11. The semi-dry preparation process according to claim 10, wherein in the step (1), the thickness of each layer of the material A is 0.3-1.0 mm, and the number of layers of the material is 5-12;
or in the step (1), the spraying amount of the solution B is 0.10-0.25 kg/m2The size of the atomized particles of the solution B is set to be 20-45 mu m during spraying;
or in the step (1), the forming pressure is set to be 10-55 MPa, and the pressure maintaining time is set to be 10-35 min.
12. The semi-dry process for preparation according to claim 7, wherein in the step (2), the curing is steam curing, the curing temperature is set to be between 40 and 65 ℃, and the curing time is set to be between 4 and 18 hours;
or, in the step (2), the drying conditions are as follows: the drying temperature is not more than 62 ℃, and the drying time is 0.5-3 h.
13. The use of the cement ceiling tile with electromagnetic shielding function according to any one of claims 1 to 9 and/or the cement ceiling tile prepared by the semi-dry method preparation process according to claim 11 in the field of construction engineering.
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