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Broad band multilayer foam wave-suction material and method for making same

A wave absorbing material and foam technology, applied in the field of broadband electromagnetic wave absorbing materials and preparation, can solve the problems of narrow absorption frequency band and only one absorption peak, and achieve the effect of wide absorption frequency band, good low frequency performance and excellent environmental performance.

Inactive Publication Date: 2007-03-14
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the absorption frequency band of this material is very narrow, and generally there is only one absorption peak

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0016] The preparation method of aforementioned coating is:

[0017] Step 1: carbon black (0.5%-2%), TW water-based dispersant (0.5%-2%), antimony trioxide (0.3%-1.0%), zinc oxide (0.3%-1.0%), antioxidant (0.1%~0.5%), accelerator (0.1%~0.5%), amine antifungal agent (0.1%~0.5%) and water (2%~8%) of 4 times the weight of carbon black in the above formula are mixed, Grind the mixed solution with a two-roller compactor for 5-10 minutes.

[0018] Step 2 Put the mixed solution ground in step 1 and the water (58%-88%) of the remaining weight in the above formula into a high-speed mixer, stir at a high speed for 15-30 minutes, and the stirring speed is 500r / m-600r / m .

[0019] Step 3 Add styrene-acrylic emulsion (2% to 32%) and emulsion type defoamer (0.1% to 0.5%) to the solution after high-speed stirring in step 2, put the mixed solution in a low-speed mixer, and stir at a low speed for 10-15 Minutes, the stirring speed is 50r / m~100r / m.

[0020] In step 4, filter with a 200-mesh...

Embodiment 1

[0037] The broadband electromagnetic wave absorbing material prepared by the invention has three layers with a thickness of 36 mm (thicknesses of the three layers are respectively 15 mm, 15 mm and 6 mm) and the absorbing performance is less than -15 dB within the frequency range of 2.6 GHz to 18 GHz. See Example 2.

Embodiment 2

[0038] The broadband electromagnetic wave absorbing material prepared by the present invention has four layers of 64mm thick (the thicknesses of the three layers are respectively 20mm, 20mm, 20mm and 4mm). Less than -20dB. See Example 3.

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Abstract

This invention relates to wide band multi-layer bubble wave absorptive materials and its process method in function materials technique. This invention forms single layer by open polyurethane bubble materials and wave absorptive materials.

Description

technical field [0001] The invention belongs to the technical field of functional materials, and relates to a broadband electromagnetic wave absorbing material and a preparation technology. Background technique [0002] In recent years, with the increasing demand for military and civilian electromagnetic wave absorbing materials, various electromagnetic wave absorbing materials have emerged, especially ferrite, metal powder, polycrystalline / amorphous fiber and foam absorbing materials. [0003] For foam absorbing materials, traditional wedges are widely used in absorbing anechoic chambers, and their absorbing performance varies according to the height, and can reach above -50dB. But its disadvantages are also obvious: the height is too high, taking up too much space; the absorbent is easy to fall off after long-term use; the flame retardant effect is poor, etc. [0004] Flat foam absorbing materials have been widely used in aircraft radar cabins and civil electromagnetic co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05K9/00G12B17/02C09D5/32C09D123/16C09D109/00C09D163/00C09D161/06C09D133/00C09D177/00C08K3/04
Inventor 陈良邓龙江谢建良梁迪飞
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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