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NiFe-LDH cement-based composite wave-absorbing material and preparation method thereof

A composite wave-absorbing material, cement-based technology, applied in the field of environmental protection, can solve problems such as electromagnetic wave pollution, achieve good structural strength, excellent electromagnetic wave absorption performance, and improve the effect of electromagnetic wave absorption performance

Inactive Publication Date: 2021-05-04
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the increasingly serious problem of electromagnetic wave pollution, the present invention provides a NiFe-LDH cement-based composite wave-absorbing material and a preparation method thereof. The material is a nickel-iron layered double metal hydroxide (NiFe-LDH) Wave agent, cement-based composite wave-absorbing material with cement as the cementitious material, the purpose is to effectively absorb electromagnetic waves, significantly reduce the reflectivity of cement-based materials to incident electromagnetic waves, and obtain a NiFe-LDH cement-based composite wave-absorbing material

Method used

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  • NiFe-LDH cement-based composite wave-absorbing material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Cement: P·O 42.5 R ordinary Portland cement, produced by Onoda Cement Plant, 28-day compressive strength 54.3MPa, 28-day flexural strength 8.9MPa, 300 parts.

[0033] NiFe-LDH: nickel-iron layered double hydroxide, pore size 16-23nm, specific surface area 17.85m 2 / g, 3 parts.

[0034] Water reducer: polycarboxylate high-efficiency water reducer, 3 parts.

[0035] Mixing water: Dalian tap water, 100 parts.

[0036] The preparation steps are as follows:

[0037] Accurately weigh the water reducer and add it to the quantitative mixing water, stir for 3 minutes to make the water reducer evenly distributed in the solution, and obtain a mixed aqueous solution. Accurately weighed nickel-iron layered double hydroxide (NiFe-LDH) was added to the aqueous mixing solution, and placed in a 300W ultrasonic environment for ultrasonic treatment for 180s to obtain a uniformly dispersed aqueous mixing solution of NiFe-LDH.

[0038] Accurately weigh the cement according to the propor...

Embodiment 2

[0040] Cement: P·O 42.5 R ordinary Portland cement, produced by Onoda Cement Plant, 28-day compressive strength 54.3MPa, 28-day flexural strength 8.9MPa, 350 parts.

[0041] NiFe-LDH: nickel-iron layered double hydroxide, pore size 16-23nm, specific surface area 17.85m 2 / g, 3.5 parts.

[0042] Water reducer: polycarboxylate high-efficiency water reducer, 3.5 parts.

[0043]Mixing water: Dalian tap water, 120 parts.

[0044] The preparation steps are as follows:

[0045] Accurately weigh the water reducer and add it to the quantitative mixing water, stir for 3 minutes to make the water reducer evenly distributed in the solution, and obtain a mixed aqueous solution. Accurately weighed nickel-iron layered double hydroxide (NiFe-LDH) was added to the aqueous mixing solution, placed in a 300W ultrasonic environment for ultrasonic treatment for 180s, and a uniformly dispersed aqueous mixing solution of NiFe-LDH was obtained.

[0046] Accurately weigh the cement according to the...

Embodiment 3

[0048] Cement: P·O 42.5 R ordinary Portland cement, produced by Onoda Cement Plant, 28-day compressive strength 54.3MPa, 28-day flexural strength 8.9MPa, 400 parts.

[0049] NiFe-LDH: nickel-iron layered double hydroxide, pore size 16-23nm, specific surface area 17.85m 2 / g, 4 parts.

[0050] Water reducer: polycarboxylate high-efficiency water reducer, 4 parts.

[0051] Mixing water: Dalian tap water, 140 parts.

[0052] The preparation steps are as follows:

[0053] Accurately weigh the water reducer and add it to the quantitative mixing water, stir for 3 minutes to make the water reducer evenly distributed in the solution, and obtain a mixed aqueous solution. Accurately weighed nickel-iron layered double hydroxide (NiFe-LDH) was added to the aqueous mixing solution, placed in a 300W ultrasonic environment for ultrasonic treatment for 180s, and a uniformly dispersed aqueous mixing solution of NiFe-LDH was obtained.

[0054] Accurately weigh the cement according to the pr...

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Abstract

The invention belongs to the field of environmental protection, and provides a NiFe-LDH cement-based composite wave-absorbing material and a preparation method thereof. The raw materials comprise: 300-400 parts of cement; 3-4 parts of NiFe-LDH; 3-4 parts of a water reducing agent; and 100-140 parts of mixing water. The preparation method comprises the following steps: firstly, adding the water reducing agent into the mixing water, and stirring for 3 minutes to form a uniform mixing solution; secondly, adding nickel-iron layered double hydroxides (NiFe-LDH) into the mixed solution, placing the mixed solution in an ultrasonic environment for ultrasonic treatment, and obtaining a mixed aqueous solution in which NiFe-LDH is evenly dispersed; then, putting accurately weighed cement into a stirring pot, then adding the stirring solution, stirring the mixture to be uniform, and pouring the prepared slurry into a mold; and finally, maintaining the sample in an air environment, and removing the mold. The prepared NiFe-LDH cement-based composite wave-absorbing material is low in electromagnetic wave reflectivity, the frequency width with the reflectivity lower than -10 dB is wide, and the NiFe-LDH cement-based composite wave-absorbing material is suitable for electromagnetic wave pollution absorption of multiple frequency bands and has remarkable environmental protection and engineering application value.

Description

technical field [0001] The invention belongs to the field of environmental protection, uses nickel-iron layered double metal hydroxide (NiFe-LDH) as a wave absorbing agent, and uses cement material as a cementitious material to prepare a cement-based composite wave-absorbing material, in particular to a NiFe-LDH LDH cement-based composite wave-absorbing material and a preparation method thereof. Background technique [0002] In the middle of the nineteenth century, the second industrial revolution brought mankind into the "Electrical Age", and human science and technology have made great progress. Since the twentieth century, the research and development of various electronic and electrical equipment has greatly improved human productivity. Improve the living standards of human beings. At the same time, the electromagnetic radiation and interference generated by electrical facilities also affect human production and life, leading to the deteriorating electromagnetic environm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04
CPCC04B28/04C04B2111/00258C04B22/06C04B2103/302
Inventor 王宝民邓双艾红梅范程程
Owner DALIAN UNIV OF TECH
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