A kind of gypsum-based wave-absorbing composite material and its preparation method

A composite wave absorbing material and gypsum-based technology, which is applied in the field of building materials to achieve the effect of simple and feasible production process

Active Publication Date: 2017-09-29
CHINA BUILDING MATERIALS ACAD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In principle, the addition of porous materials can also improve the microwave-absorbing performance of gypsum-based materials, and gypsum-based microwave-absorbing composites with porous materials have been rarely reported so far.

Method used

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  • A kind of gypsum-based wave-absorbing composite material and its preparation method
  • A kind of gypsum-based wave-absorbing composite material and its preparation method
  • A kind of gypsum-based wave-absorbing composite material and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] In the present embodiment, the mass percent that each raw material occupies is as follows:

[0025] Gypsum powder accounts for 75%; wave absorbing agent accounts for 15%, including carbon black 2%, manganese zinc ferrite 13%; expanded perlite accounts for 10%; The ratio is 0.5:100; the weight ratio of dry material to water is 0.6:1.

[0026] Prepared as follows:

[0027] 1) Mix dry materials and dry mix evenly;

[0028] 2) Add water to the dry material and mix well;

[0029] 3) Pour the mixture in step 2) into a mould, vibrate and mold, remove the mold after 24 hours of molding, and maintain for 28 days under standard conditions.

[0030] The sample prepared in this embodiment is tested for absorbing performance, and the reflectivity curve is shown in figure 1 shown.

Embodiment 2

[0032] In the present embodiment, the mass percent that each raw material occupies is as follows:

[0033] Gypsum powder accounts for 75%; wave absorbing agent manganese zinc ferrite powder accounts for 20%; expanded vitrified microspheres account for 5%; the ratio of polycarboxylate high-performance water reducer to the total weight of dry materials is 0.5:100; The weight ratio of material to water is 0.65:1.

[0034] Prepared as follows:

[0035] 1) Mix and dry mix the dry materials evenly;

[0036] 2) Add water to the dry material and mix well;

[0037] 3) Pour the mixture in step 2) into a mould, vibrate and mold, remove the mold after 24 hours of molding, and maintain for 28 days under standard conditions.

[0038] The sample prepared in this embodiment is tested for absorbing performance, and the reflectivity curve is shown in figure 2 shown.

Embodiment 3

[0040] In the present embodiment, the mass percent that each raw material occupies is as follows:

[0041] Gypsum powder accounts for 75%; wave absorbing agent accounts for 15%, including expanded graphite 5%, carbonyl iron powder 10%; expanded perlite accounts for 10%; the ratio of polycarboxylate high-performance water reducer to the total weight of dry materials is 0.8:100; the weight ratio of dry material to water is 0.55:1.

[0042] Prepared as follows:

[0043] 1) Mix dry materials and dry mix evenly;

[0044] 2) Add water to the dry material and mix well;

[0045] 3) Pour the mixture in step 2) into a mould, vibrate and mold, remove the mold after 24 hours of molding, and maintain for 28 days under standard conditions.

[0046] The sample prepared in this embodiment is tested for absorbing performance, and the reflectivity curve is shown in image 3 shown.

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Abstract

The invention relates to a gypsum base absorbing composite material and a preparation method thereof, and belongs to the technical field of building materials. The absorbing composite material includes dry materials and water; the dry materials include gypsum, a wave-transparent aggregate and an absorbing agent; the absorbing agent accounts for 1-20 wt. % of the dry material, the wave-transparent aggregate accounts for 5-25 wt.% of the dry material, the gypsum accounts for 55-94 wt.% of the dry material, and the weight ratio of water to dry materials is 0.5-0.7:1. The preparation method comprises the following steps: mixing the dry materials uniformly, adding water, stirring well, pouring the mixture into a mold, carrying out vibration molding, demoulding 24h after moulding, maintaining under standard conditions and finally drying. The gypsum base absorbing composite material has wide absorbing frequency bandwidth, and high electromagnetic wave absorption capability within the scope of 2-18 GHz; and the production process is simple and feasible.

Description

technical field [0001] The invention relates to the field of building materials, in particular to a gypsum-based wave-absorbing composite material and a preparation method thereof. technical background [0002] In recent years, with the widespread use of various modern electronic devices and the increasing popularity of mobile communications, wireless networks and other communication devices, electromagnetic pollution has become increasingly serious. Electromagnetic pollution will not only affect the normal use of precision instruments, medical electronic equipment, aerospace systems, automated micro-processing systems, etc., but also cause information leakage through electromagnetic radiation, and will also affect the human visual system, immune system, cardiovascular system, and endocrine system. , the reproductive system and the nervous central system, etc., and the economic losses caused by electromagnetic radiation and the damage to human health are on the rise. Electro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/14C04B14/18C04B14/24
Inventor 冀志江解帅杨洋王静侯国艳
Owner CHINA BUILDING MATERIALS ACAD
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