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Fully-perforated microwave absorbing material and preparation method thereof

A microwave-absorbing material and fully open-hole technology, which can be used in radiation-absorbing coatings, polyurea/polyurethane coatings, chloroprene homopolymer coatings, etc., and can solve problems such as large environmental pollution and microwave absorption performance not listed , to achieve the effects of less environmental pollution, flexible implementation, and good strength

Active Publication Date: 2014-04-16
NANJING BOPING ELECTRONICS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] U.S. published patent US5185381 involves the development of this type of material, which is mainly realized by spraying. Its microwave absorber is composed of conductive carbon black and silver powder. The solvent is methyl ethyl ketone, which causes great environmental pollution. The microwave absorption performance of its material is not listed.

Method used

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  • Fully-perforated microwave absorbing material and preparation method thereof
  • Fully-perforated microwave absorbing material and preparation method thereof
  • Fully-perforated microwave absorbing material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Weigh 690g of water and 11g of dispersant N into a plastic container, set the speed at 500RPM, and disperse evenly with an F-0.4 high-speed disperser. Then add 42g of conductive carbon black, 15g of barium titanate, 4g of silicon dioxide, 15g of tetrabromobisphenol A, and 5g of antimony trioxide in sequence, adjust the rotation speed to 1500RPM, and disperse for 20min to form a conductive paste. Import the conductive paste into the LKS-21 vertical sand mill, and the sanding time is 30min. After sanding, the conductive slurry is filtered with a 300-mesh stainless steel gauze, and 217gPU-113 water-based polyurethane binder (solid content 35%), 1g silver-plated T3 conductive copper powder (300 mesh) is added, and the F-0.4 high-speed disperser Disperse for 25 minutes to make an aqueous microwave absorbing solution. Take a square fully-opened sponge with a thickness of 2 cm and a side length of 50 cm, with a pore diameter of 0.3-0.5 cm and a pore density of 5-8 per square ...

Embodiment 2

[0025] Weigh 668g of water and 11g of dispersant N into a plastic container, set the speed at 500RPM, and disperse evenly with an F-0.4 high-speed disperser. Then add 42g of conductive carbon black, 32g of barium titanate, 8g of silicon dioxide, 15g of tetrabromobisphenol A, and 5g of antimony trioxide in sequence, adjust the rotation speed to 1500RPM, and disperse for 20min to form a conductive paste. Import the conductive paste into the LKS-21 vertical sand mill, and the sanding time is 30min. After sanding, the conductive slurry is filtered with 300-mesh stainless steel gauze, and 217gPU-113 water-based polyurethane binder (solid content 35%), 2g silver-plated T3 conductive copper powder (300 mesh) are added, and the powder is mixed in the F-0.4 high-speed disperser Disperse for 25 minutes to make an aqueous microwave absorbing solution. Take a square fully-opened sponge with a thickness of 2 cm and a side length of 50 cm, with a pore diameter of 0.3-0.5 cm and a pore dens...

Embodiment 3

[0027] Weigh 633g of water and 11g of dispersant N into a plastic container, set the speed at 500RPM, and disperse evenly with an F-0.4 high-speed disperser. Then add 42g of conductive carbon black, 65g of barium titanate, 9g of silicon dioxide, 15g of tetrabromobisphenol A, and 5g of antimony trioxide in sequence, adjust the rotation speed to 1500RPM, and disperse for 20min to form a conductive paste. Import the conductive paste into the LKS-21 vertical sand mill, and the sanding time is 30min. After sanding, the conductive slurry is filtered with a 300-mesh stainless steel gauze, and 217g of PU-113 water-based polyurethane binder (solid content 35%) and 3g of silver-plated T3 conductive copper powder (300 mesh) are added, and dispersed at F-0.4 at high speed Disperse by machine for 25 minutes to make an aqueous microwave absorbing solution. Take a square fully-opened sponge with a thickness of 2 cm and a side length of 50 cm, with a pore diameter of 0.3-0.5 cm and a pore de...

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Abstract

The invention relates to a fully-perforated water-resistant microwave absorbing material and a preparation method thereof. The fully-perforated water-resistant microwave absorbing material comprises sponge of which one or two surfaces are provided with a microwave absorbing solution layer, wherein the microwave absorbing solution consists of the following components in percentage by mass: 25 to 35 percent of a microwave absorbent, 50 to 55 percent of a water-based adhesive, 14 to 25 percent of a flame retardant, and 0.1 to 0.3 percent of a filling material. During preparation, by adopting a spraying technology, the water-based microwave absorbing solution is sprayed on one or two surfaces of the fully-perforated sponge, the spraying quality is controlled, and the sponge is dried to ensure that the fully-perforated sponge material has a broadband microwave absorption performance. Test results show that the vertical reflectivity of the fully-perforated water-resistant microwave absorbing material with the thickness of 2 centimeters is less than -12dB in a frequency range of 2 to 18 GHz. The microwave absorbing solution mainly comprises the materials including the microwave absorbent, the water-based adhesive, the flame retardant, the filling material and the like, and the fully-perforated water-resistant microwave absorbing material is prepared by adopting spraying.

Description

technical field [0001] The invention relates to a microwave absorbing material with full openings and a preparation method thereof, which is mainly used for absorbing clutter inside a microwave relay antenna, reducing side lobes and improving the performance of the microwave relay antenna. Background technique [0002] Microwave absorbing material with full opening is a special kind of microwave absorbing material, mainly used for absorbing clutter inside the microwave relay antenna, and taking into account good air flow, water resistance, good heat dissipation, good strength, can withstand high power, and has outstanding weather resistance , aging resistance and other properties. Therefore, it is a huge difficulty and challenge to develop fully open-pore microwave absorbing materials. Although foreign companies have produced such products in the 1990s, their performance is related to the thickness of the material. The microwave vertical absorption rate of the fully open wa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J9/36C08J7/04C08L75/04C09D133/00C09D175/04C09D111/00C09D7/12C09D5/32
Inventor 胡益民柳海莉张洋黄亮
Owner NANJING BOPING ELECTRONICS TECH CO LTD
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