CN109912279B - Foaming cement-based zeolite-ferrite wave-absorbing material and preparation method thereof - Google Patents
Foaming cement-based zeolite-ferrite wave-absorbing material and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a foaming cement-based zeolite-ferrite wave-absorbing material which is prepared from the following components in parts by weight: 40-50 parts of Portland cement, 24-30 parts of water, 2-5 parts of hydrogen peroxide, 20-30 parts of zeolite @ ferrite wave absorbing agent and 2-8 parts of thickening agent. The invention relates to a cement-based zeolite-ferrite wave-absorbing material, which is a foaming porous cement-based zeolite-ferrite wave-absorbing material with excellent performance prepared by preparing a zeolite @ ferrite wave-absorbing agent by using ferrierite loaded ferrite and mixing the zeolite @ ferrite wave-absorbing agent, hydrogen peroxide, portland cement, water and a thickening agent. The ferrierite and the low-cost foaming porous cement matrix belong to porous materials, the complex pore structure plays a role in attenuating the intensity of electromagnetic waves, meanwhile, the ferrite is an excellent magnetic loss type wave-absorbing material, and the cost of the wave-absorbing material can be reduced and the performance of the wave-absorbing material can be improved by compounding the low-cost foaming porous cement matrix material with the magnetic loss wave-absorbing material.
Description
Technical Field
The invention belongs to the technical field of wave-absorbing materials, and particularly relates to a foamed cement-based zeolite-ferrite wave-absorbing material and a preparation method thereof.
Background
With the rapid development of urban economy in China, more and more electronic and electrical equipment enter daily families, and are most closely related to modern people, undoubtedly, various household appliances. Computers, televisions, refrigerators, microwave ovens, range hoods and the like have become essential parts in our lives. They bring great convenience to people's daily life and pose great threat to people's daily life and physical health. Therefore, the wave-absorbing material, which is a material capable of resisting and weakening electromagnetic wave radiation, is a major subject of material science to be found for treating electromagnetic pollution. However, the existing wave-absorbing material has the problems of narrow frequency band, low absorption efficiency, large mass, high cost, poor stability, poor environmental adaptation and the like; the strength of the base material is low; lack of combined structure design, durability design and design for functionality.
The cement-based wave-absorbing material is an effective way for meeting the requirement of civil buildings on electromagnetic wave radiation protection. The porous structure of the porous concrete has great effect on the absorption of electromagnetic waves, and the cement-based material has low cost, so that the comprehensive cost of the wave-absorbing material can be greatly reduced, and the research on the cement-based material for the cement-based porous material with wave-absorbing performance has important significance on the aspect of civil building wave-absorbing materials.
Disclosure of Invention
The invention aims to provide a foaming cement-based zeolite-ferrite wave-absorbing material and a preparation method thereof, and the invention can provide a wave-absorbing coating with low cost, wide frequency band, high absorption efficiency, small quality and good stability.
In order to solve the problems in the prior art, the invention adopts the technical scheme that:
a foaming cement-based zeolite-ferrite wave-absorbing material is prepared from the following components in parts by weight:
40-50 parts of Portland cement, 24-30 parts of water, 2-5 parts of hydrogen peroxide, 20-30 parts of zeolite @ ferrite wave absorbing agent and 2-8 parts of thickening agent;
further, the portland cement is PO & I42.5 portland cement.
Further, the purity of the hydrogen peroxide is 30%.
Further, the thickening agent is carboxymethyl cellulose ether.
Further, the zeolite @ ferrite wave absorbing agent is prepared from the following components in parts by weight:
FeCl3·6H20.3 part of O, CH31.5 parts of COONa, 11.6 parts of ferrierite and 86.6 parts of water.
Furthermore, the ferrierite pore channel system is 10-8, the dimension is 2, and the pore diameter is 0.43 multiplied by 0.55/nm.
The zeolite @ ferrite wave absorbing agent is prepared by the following method:
first, 0.3 part of FeCl was weighed3·6H2O, 1.5 parts of CH3COONa substance, 11.6 parts of ferrierite and 86.6 parts of water are put into a reactor, stirred for 30min at 1500r/min and 25 ℃ to form a mixed solution, then the mixed solution is transferred into a reaction kettle, reacted for 15h at 250 ℃, and finally filtered by a 0.45-micron filter membrane by using absolute ethyl alcohol.
The method for preparing the foaming cement-based zeolite-ferrite wave-absorbing material comprises the following steps:
firstly, weighing 40-50 parts of portland cement, 20-30 parts of zeolite @ ferrite wave absorbing agent and 2-8 parts of carboxymethyl cellulose ether, dry-mixing in a stirrer, slowly stirring for 1min at the speed of 60r/min, then quickly pouring 2-5 parts of hydrogen peroxide and 24-30 parts of water into the stirrer after mixing, slowly stirring for 1min at the speed of 60r/min, and then quickly stirring for 2min at the speed of 300 r/min.
Compared with the prior art, the invention has the following advantages and effects:
1. the invention relates to a cement-based zeolite-ferrite wave-absorbing material, which is a foaming porous cement-based zeolite-ferrite wave-absorbing material with excellent performance prepared by preparing a zeolite @ ferrite wave-absorbing agent by using ferrierite loaded ferrite and mixing the zeolite @ ferrite wave-absorbing agent, hydrogen peroxide, portland cement, water and a thickening agent. The ferrierite and the low-cost foaming porous cement matrix belong to porous materials, the complex pore structure plays a role in attenuating the intensity of electromagnetic waves, meanwhile, the ferrite is an excellent magnetic loss type wave-absorbing material, and the cost of the wave-absorbing material can be reduced and the performance of the wave-absorbing material can be improved by compounding the low-cost foaming porous cement matrix material with the magnetic loss wave-absorbing material. The raw materials of the invention contain zeolite @ ferrite wave absorbing agent, and the wave absorbing mechanism of the zeolite @ ferrite wave absorbing agent comprises: the ferrite can be polarized repeatedly under the electromagnetic wave changing electric field to convert the electromagnetic energy into heat energy; the zeolite contains a large amount of pores and large specific surface area, and the foamed cement-based material contains a plurality of micropores, so that the wave absorbing performance of the wave absorbing material can be further improved through the refraction loss of electromagnetic waves.
2. The cement-based zeolite-ferrite wave-absorbing material has controllability, and can improve the matching property between the pore structure state and the wave-absorbing performance by controlling the preparation of the pore structure (aperture, pore state, porosity and the like) of the foamed cement-based material, thereby improving the wave-absorbing efficiency.
3. The cement-based zeolite-ferrite wave-absorbing material disclosed by the invention is low in cost due to the adoption of the low-cost foamed cement material, so that the comprehensive cost of the wave-absorbing material is greatly reduced.
4. The invention has convenient construction and simple operation, can adopt mechanical spraying and can also be prepared into prefabricated block materials.
Detailed Description
The present invention is further described in detail with reference to the following specific examples, but the scope of the present invention is not limited by the specific examples, which are defined by the claims. In addition, any modification or change that can be easily made by a person having ordinary skill in the art without departing from the technical solution of the present invention will fall within the scope of the claims of the present invention.
Example 1:
the foamed cement-based zeolite-ferrite wave-absorbing material is prepared from the following components:
40kg of Portland cement, 24kg of water, 2kg of hydrogen peroxide, 20kg of zeolite @ ferrite wave absorbing agent and 8kg of thickening agent. The thickener described in this example is carboxymethyl cellulose ether.
The preparation method of the foamed cement-based zeolite-ferrite wave-absorbing material is completed according to the following steps:
firstly, weighing 40kg of portland cement, 20kg of zeolite @ ferrite wave absorbing agent and 8kg of carboxymethyl cellulose ether, dry-mixing in a stirrer, slowly stirring for 1min at the speed of 60r/min, then quickly pouring 2kg of hydrogen peroxide and 24kg of water into the stirrer after mixing, slowly stirring for 1min at the speed of 60r/min, and then quickly stirring for 2min at the speed of 300 r/min.
The portland cement in this example is PO · i 42.5 portland cement; the purity of the hydrogen peroxide is 30%.
The zeolite @ ferrite absorber described in this example was made from the following components:
FeCl3·6H2o is 0.3kg, CH31.5kg of COONa, 11.6kg of ferrierite and 86.6kg of water. The ferrierite pore channel system is 10-8, the dimension is 2, and the pore diameter is 0.43 multiplied by 0.55/nm.
The preparation method of the zeolite @ ferrite wave absorber described in the embodiment is completed according to the following steps:
first, 0.3kg of FeCl was weighed3·6H2O、1.5kg CH3COONa, 11.6kg of ferrierite and 86.6kg of water are placed in a reactor and stirred for 30min at 1500r/min and 25 ℃. Then the mixed solution is transferred to a reaction kettle and reacts for 15 hours at the temperature of 250 ℃. Then, the mixture is filtered by a 0.45 mu m filter membrane by using absolute ethyl alcohol, and is washed and filtered for three times.
The cost of the embodiment is 200 yuan, and when the thickness is 1cm, the strongest absorption peak at the frequency of 8GHz is-55.2 dB; the strongest absorption peak at a frequency of 30 GHz-12 dB.
Example 2:
the difference between the present embodiment and embodiment 1 is only that the raw material composition ratio of the foamed cement-based zeolite-ferrite wave-absorbing material is different, and the foamed cement-based zeolite-ferrite wave-absorbing material of the present embodiment is prepared from the following components by weight:
45kg of Portland cement, 27kg of water, 3kg of hydrogen peroxide, 25kg of zeolite @ ferrite wave absorbing agent and 5kg of thickening agent.
The rest is the same as example 1.
The cost price of this example is 249 yuan, and when the thickness is 1cm, the strongest absorption peak is-58.8 dB at the frequency of 8GHZ, and the strongest absorption peak is-14 dB at the frequency of 30 GHz.
Example 3:
the difference between the present embodiment and embodiment 1 is only that the raw material composition ratio of the foamed cement-based zeolite-ferrite wave-absorbing material is different, and the foamed cement-based zeolite-ferrite wave-absorbing material of the present embodiment is prepared from the following components by weight:
50kg of Portland cement, 30kg of water, 5kg of hydrogen peroxide, 30kg of zeolite @ ferrite wave absorbing agent and 2kg of thickening agent.
The rest is the same as example 1.
The cost price of the embodiment is 314 yuan, and when the thickness is 1cm, the strongest absorption peak is-60.8 dB at the frequency of 8GHz, and the strongest absorption peak is-18.2 dB at the frequency of 30 GHz.
Claims (5)
1. A foaming cement-based zeolite-ferrite wave-absorbing material is characterized by being prepared from the following components in parts by weight:
40-50 parts of Portland cement, 24-30 parts of water, 2-5 parts of hydrogen peroxide, 20-30 parts of zeolite @ ferrite wave absorbing agent and 2-8 parts of thickening agent;
the zeolite @ ferrite wave absorbing agent is prepared from the following components in parts by weight:
FeCl3·6H20.3 part of O, CH31.5 parts of COONa, 11.6 parts of ferrierite and 86.6 parts of water;
the zeolite @ ferrite wave absorbing agent is prepared by the following method:
first, 0.3 part of FeCl was weighed3·6H2O, 1.5 parts of CH3Placing COONa substance, 11.6 parts of ferrierite and 86.6 parts of water in a reactor, stirring for 30min at 1500r/min and 25 ℃ to form a mixed solution, transferring the mixed solution into a reaction kettle, reacting for 15h at 250 ℃, and finally filtering with a 0.45-micron filter membrane by using absolute ethyl alcohol;
the ferrierite pore channel system is 10-8, the dimension is 2, and the pore diameter is 0.43 multiplied by 0.55/nm.
2. The foamed cement-based zeolite-ferrite wave-absorbing material according to claim 1, characterized in that: the portland cement is PO & I42.5 portland cement.
3. The foamed cement-based zeolite-ferrite wave-absorbing material according to claim 1, characterized in that: the purity of the hydrogen peroxide is 30%.
4. The foamed cement-based zeolite-ferrite wave-absorbing material according to claim 1, characterized in that: the thickening agent is carboxymethyl cellulose ether.
5. The method for preparing the foaming cement-based zeolite-ferrite wave-absorbing material of claim 4 is characterized by comprising the following steps:
firstly, weighing 40-50 parts of portland cement, 20-30 parts of zeolite @ ferrite wave absorbing agent and 2-8 parts of carboxymethyl cellulose ether, dry-mixing in a stirrer, slowly stirring for 1min at the speed of 60r/min, then quickly pouring 2-5 parts of hydrogen peroxide and 24-30 parts of water into the stirrer after mixing, slowly stirring for 1min at the speed of 60r/min, and then quickly stirring for 2min at the speed of 300 r/min.
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| CN111807772B (en) * | 2020-07-14 | 2021-12-07 | 乐清市凡山电器有限公司 | Pumice concrete with electromagnetic wave absorption function and preparation method thereof |
| CN112341090B (en) * | 2020-11-16 | 2021-11-23 | 北京科技大学 | Environment-friendly electromagnetic shielding functional cementing material and preparation method thereof |
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