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Preparation method and application of microwave absorbing diatom mud coating

A technology of diatom mud coating and microwave absorption, applied in radiation-absorbing coatings, coatings, coverings/linings, etc., can solve the problems of poor environmental adaptability, poor stability, and poor durability, and achieve low preparation costs and good dispersion , the effect of a wide range of sizes

Active Publication Date: 2020-08-04
ZHEJIANG NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although cement-based composite absorbing materials have developed rapidly, there are still problems such as narrow frequency band, low absorption, heavy weight, easy settlement, high cost, poor stability, poor environmental adaptability, and poor durability.
But there is no report about "microwave absorbing diatom mud coating" at present

Method used

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  • Preparation method and application of microwave absorbing diatom mud coating
  • Preparation method and application of microwave absorbing diatom mud coating
  • Preparation method and application of microwave absorbing diatom mud coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Add 0.01mol (0.05mol L -1 )FeSO 4 ·7H 2 O and 200 mL of water, stirred magnetically at room temperature, gave a light green solution. 0.02mol (0.1mol·L -1 )KBH 4 Add it into a beaker and stir it magnetically for 30 minutes. After the reaction is complete, cool it, separate it by magnetic separation, and wash it. Dry at 60°C for 6 hours to obtain the desired iron fibers. 0.3 grams of iron fiber was loaded with a ceramic ark of 6 cm × 3 cm × 1.5 cm, 2 mL of benzene was added to the ark, the ark was placed in a single-temperature tube furnace, and the reaction was carried out at 400 ° C for 2 h under nitrogen protection (the heating time was 1h). After the reaction was completed, it was cooled to room temperature with the furnace under the protection of nitrogen.

[0038]The resulting product is black, and the product's morphology, phase, structure, selected area electron diffraction pattern and Raman spectrum observed under a transmission electron microscope are as...

Embodiment 2

[0040] The steps are the same as in Example 1, but when the iron fiber is prepared, the iron salt is ferrous ammonium sulfate, and its iron ion concentration is 0.2mol L -1 , the organic substance is toluene, and its volume is 1 mL. The resulting product is black, and the morphology observed under the scanning electron microscope is as follows: Figure 6 As shown, it can be seen that the product is a fiber with a fiber diameter of 0.13-0.27 μm and an aspect ratio of 12.20-23.30. Static magnetic properties such as Figure 7 As shown, the saturation magnetization is 80.63emu·g -1 .

Embodiment 3

[0042] Using the product in Example 2 as a microwave absorber, soak the dry diatom ooze powder and the microwave absorber in water for 10 minutes, and then stir it electrically for 30 minutes to obtain a microwave-absorbing diatom ooze coating. The mass ratio of diatom mud dry powder, microwave absorber and water is 1:1.5:18. Distribute it on the wall by scraping (the construction schematic diagram is as follows Figure 8 shown), in order to measure the performance, distribute it on a 180cm×180cm metal plate, prepare a wave-absorbing coating plate with a thickness of 1.55-8.0mm, and a coloring layer and a light-receiving layer of 0.3-0.5mm on the surface, and measure it after 2 days of curing Its microwave absorption performance is Figure 9 shown. It can be seen that the maximum reflection loss is –43.7dB, of which the reflectivity is less than –10dB in the 2-18GHz frequency band; the reflectivity is less than –20dB in the 2.0-15.44GHz frequency band; the effective bandwidt...

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Abstract

The invention relates to a preparation method for a microwave absorption diatom ooze coating material and an application. The method comprises the following steps: mixing diatom ooze dry powder, a microwave absorbent and a dispersant according to a mass ratio of 1:1.5:(18-25), performing soaking for 10-20min, and performing electric stirring for 30-60min to obtain the microwave absorption diatom ooze coating material; and the microwave absorbent is a carbon magnetic heterostructural micro nano fiber. According to the microwave absorption diatom ooze coating material prepared from the method, when the microwave absorption diatom ooze coating material is applied, a concrete construction method comprises the following steps: scraping bottom-layer putty on cleaned wall surfaces, grinding wall surfaces until the wall surfaces are smooth, dispersing the microwave absorption diatom ooze coating material to building wall surfaces uniformly by 2-3 times, making diatom ooze patterns or performing coloring or making a press polishing layer at the treated building wall surfaces, and performing maintenance for 1-2 days to obtain the finished product. The microwave absorption diatom ooze coating material is an ideal green and environmentally-friendly building and decorative material, has excellent microwave absorbing characteristics, beautifies and decorates environments, and can avoid electromagnetic pollution and information leakage; and the microwave absorption diatom ooze coating material can be used at wall surfaces of buildings such as electromagnetic shielding darkrooms, residential power distribution rooms, military meeting rooms and secret rooms, television towers, broadcasting rooms, radars, and satellite communication launching pads.

Description

technical field [0001] The invention relates to the technical field of architectural coatings, in particular to a preparation method and application of a microwave-absorbing diatom mud coating. Background technique [0002] Diatom mud material is made of diatomite as the main raw material, adding basic powder, aggregate and other additives. The chemical composition of diatomite is mainly SiO 2 , in addition to a small amount of Al 2 o 3 , CaO, MgO, etc. Has a special porous structure and a high specific surface area of ​​65m 2 / g, can be used to adjust humidity, purify air, fire and flame retardant, sound absorption and noise reduction, protect eyesight, and customize, thus becoming a green and healthy interior and exterior wall decoration wall material. In addition, the electromagnetic pollution generated by widely used electronic and electrical equipment is becoming more and more serious. Therefore, the development of new, efficient, and inexpensive microwave absorbi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D1/00C09D5/32E04F13/02
CPCC09D1/00E04F13/02E04F2290/04
Inventor 童国秀赵彦婷刘琳潘叶飞金晨王茹吴文华
Owner ZHEJIANG NORMAL UNIVERSITY
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