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Cement ceiling board with electromagnetic shielding function and its semi-dry preparation process

An electromagnetic shielding and preparation process technology, applied in the field of cement ceiling panels and semi-dry preparation processes, can solve the problems of restricting cement-based ceiling panels, high density and compressive strength, low breaking load, etc., and avoid electromagnetic shielding ceilings. Effects of plate delamination, high breaking load, enhanced bond strength

Active Publication Date: 2021-05-25
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, cement-based materials have higher density, higher compressive strength, and lower flexural strength. Therefore, when cement boards are directly used as ceiling boards, their mass per unit area is heavy and their fracture loads are low. In addition, the existing Cement board is generally prepared by wet method, that is, the raw material is mixed with water to make a slurry, and then the slurry is used to prepare a cement board. The initial water-cement ratio is high, and the water requirement for cement hydration is low. After the cement-based substrate is hardened, the original The space occupied by free water forms voids
Therefore, the existing cement-based material is a porous hardened body, and its porosity is as high as 20-40%. The present invention recognizes that this method has problems such as high porosity, low density, low flexural resistance, and poor mechanical properties.
Therefore, this restricts the possibility of cement-based materials as ceiling boards in fact.

Method used

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  • Cement ceiling board with electromagnetic shielding function and its semi-dry preparation process
  • Cement ceiling board with electromagnetic shielding function and its semi-dry preparation process
  • Cement ceiling board with electromagnetic shielding function and its semi-dry preparation process

Examples

Experimental program
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Effect test

Embodiment 1

[0051] A cement ceiling board, raw materials include cement, and its preparation process comprises the steps:

[0052] (1) Add the cement into the homogenization tank according to the water-cement ratio of 2.8 and stir to obtain cement slurry;

[0053] (2) Inject the cement slurry obtained in step (1) into the felt mold, pressurize and dehydrate the slurry to form after the injection is completed, the forming pressure is set to 60MPa, and the pressure holding time is 10min to obtain the cement ceiling slab;

[0054] (3) Put the cement slab obtained in step (2) into a steam curing room for steam curing for 12 hours, and set the curing temperature to 50° C. After completion, place the obtained hardened cement slab in a dry environment at 50° C. to dry for 3 hour, that is, a cement ceiling board.

Embodiment 2

[0056] 1. A cement ceiling board, such as figure 1 As shown, it is composed of a cement layer 1 and a carbon fiber mesh cloth 2, wherein the carbon fiber mesh cloth 2 is laid between the cement layers 1 to form an electromagnetic shielding cement ceiling board composed of an upper, middle and lower three-layer structure : The mesh size of the carbon fiber mesh cloth is 5mm×5mm.

[0057] 2. The method for preparing the cement ceiling board described in this embodiment comprises the following steps:

[0058] (1) adding the cement into the homogenization tank according to the water-cement ratio of 3 and stirring to obtain cement slurry;

[0059] (2) Inject the cement slurry obtained in step (1) into the felt mold. When half of the slurry is injected, lay the carbon fiber mesh cloth on the surface of the slurry, and then continue to inject the remaining slurry into the surface of the carbon fiber mesh cloth. Pressurized dehydration molding, the molding pressure is 60MPa, and the...

Embodiment 3

[0062] 1. An electromagnetic shielding cement ceiling board, such as figure 1As shown, it is composed of a cement layer 1 and a carbon fiber mesh cloth 2, and the carbon fiber mesh cloth 2 is laid between the cement layers 1 to form an electromagnetic shielding cement ceiling board composed of an upper, middle and lower three-layer structure.

[0063] Wherein, the mesh size of the carbon fiber mesh cloth is 5mm×5mm. Described cement layer 1 is made by powdery material A and solution B, and described powdery material A is made up of the raw material of following weight portion: cement 55 parts, silica fume 4 parts, fly ash 6 parts, polyvinylpyrrolidone (molecular weight 2.0×10 4 ) 1.0 copies.

[0064] The solution B is composed of the following raw materials in parts by weight: 98 parts of water, 1.6 parts of KH550 silane coupling agent, 0.14 parts of graphene oxide modified by ferric oxide, wherein; the GO~Fe 3 o 4 The loading amount of ferric oxide in the medium is 3.5% (...

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Abstract

The invention belongs to the field of building materials, in particular to a cement ceiling board with an electromagnetic shielding function and a semi-dry preparation process thereof. The ceiling board includes a carbon fiber mesh cloth and a cement layer, the carbon fiber mesh cloth is laid between the cement boards, the cement layer includes: material A and solution B; by weight, the material A includes: cement 45-70 parts, 3-7 parts of silica fume, 5-15 parts of fly ash, 0.3-1.5 parts of polyvinylpyrrolidone; the solution B includes: 90-98 parts of water, 1-6 parts of silane coupling agent, four 0.05-0.15 parts of ferric oxide-modified graphene oxide. The present invention is based on the existing problems in the field of cement-based materials used as ceiling boards, and proposes a formula for cement ceiling boards and a semi-dry preparation process compatible with this formula. The weight per unit area of ​​the prepared cement ceiling boards is low, The breaking load is high, and the electromagnetic shielding performance is excellent, which can fully meet the requirements of the ceiling board.

Description

technical field [0001] The invention belongs to the field of building materials, in particular to a cement ceiling board with an electromagnetic shielding function and a semi-dry preparation process thereof. Background technique [0002] With the rapid development of today's communication technology, the problem of electromagnetic radiation pollution has gradually attracted people's attention, especially in the vicinity of high-voltage and ultra-high-voltage transmission lines. When equipment is running around high-voltage transformers, strong electromagnetic radiation will be generated, which will affect the daily life of nearby residents. greater harm. Electromagnetic wave radiation will have adverse effects on the human visual system, immune system, and nerve center, unconsciously cause memory loss, affect work and life, seriously cause nervous disorders, and cause great harm to people's body and mind. Therefore, electromagnetic shielding has become the focus of people's...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/02C04B111/34
CPCC04B28/02C04B2111/00258C04B2111/343C04B2201/20C04B2201/50C04B18/146C04B18/08C04B24/2652C04B24/42C04B22/06C04B22/02C04B14/386
Inventor 芦令超闫振李来波赵丕琪程新
Owner UNIV OF JINAN
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