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Wave-absorbing foam material and preparation process thereof

A preparation process and foam technology, applied in the field of wave-absorbing materials, can solve problems such as cost increase, absorbent waste, and easy damage, and achieve the effects of high absorption rate, low slurry leakage, and high yield

Inactive Publication Date: 2019-08-16
成都雷隐科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The strength of traditional wave-absorbing foam is not high, and it is easy to be damaged during use. Moreover, in the traditional process, the yield of wave-absorbing foam is low, and there is leakage of slurry at the same time, resulting in waste of absorbent and increased costs.

Method used

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  • Wave-absorbing foam material and preparation process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Such as figure 1 As shown, a wave-absorbing foam material includes three layers of flame-retardant foam 1 that are sequentially bonded by water-based neoprene adhesive and soaked with absorbent. A layer of TPU film 2 is adhered, and a double-sided adhesive tape 3 is adhered to the TPU film 2 on the right side.

[0035] Among them, the absorbent includes the following raw materials in parts by weight: 50 parts of carbon black, 10 parts of flame retardant, 20 parts of polyurethane water-based adhesive, 30 parts of graphene, 1.5 parts of antirust agent, 1.5 parts of antifungal agent, 1.5 parts of light stabilizer 1.5 parts of thickener, 1.5 parts of curing agent, 1.5 parts of antioxidant, 100 parts of water.

[0036] In this embodiment, the absorbing foam has a reflectivity Rw of -17dB to -25dB at the center frequency and normal incidence. The relative bandwidth of the vertical incidence reflectivity Rw can reach -13dB, -10dB is 24% and 35%, respectively, the internal pe...

Embodiment 2

[0038] In this embodiment, on the basis of Example 1, the absorbent includes the following raw materials in parts by weight: 80 parts of carbon black, 40 parts of flame retardant, 50 parts of polyurethane water-based adhesive, 40 parts of graphene, 2 parts of antirust agent, 2 parts of mold agent, 2 parts of light stabilizer, 2 parts of thickener, 2 parts of curing agent, 2 parts of antioxidant, 200 parts of water.

[0039] In this embodiment, the absorbing foam has a reflectivity Rw of -12dB to -20dB at the center frequency and normal incidence. The relative bandwidth of the vertical incidence reflectivity Rw can reach -13dB, -10dB is 19% and 28% respectively, the internal performance changes little when the incident angle is 30°, the vertical polarization is about -12dB when the incident angle is 45°, the incident angle At 60°, the vertical polarization is about -10dB, and the horizontal polarization is about -15dB.

Embodiment 3

[0041] In this embodiment, on the basis of Example 1, the absorbent includes the following raw materials in parts by weight: 60 parts of carbon black, 30 parts of flame retardant, 30 parts of polyurethane water-based adhesive, 25 parts of graphene, 1 part of antirust agent, 1 part of mold agent, 1 part of light stabilizer, 1 part of thickener, 1 part of curing agent, 1 part of antioxidant, 150 parts of water.

[0042] In this embodiment, the absorbing foam has a reflectivity Rw of -9dB--19dB at the center frequency and normal incidence. The relative bandwidth of the vertical incidence reflectivity Rw can reach -13dB, -10dB is 15% and 31%, respectively, the internal performance changes little when the incident angle is 30°, the vertical polarization is about -10dB when the incident angle is 45°, the incident angle At 60°, the vertical polarization is about -8dB, and the horizontal polarization is about -16dB.

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Abstract

The invention discloses wave-absorbing foam which comprises a plurality of layers of flame-retardant foam bodies which are sequentially bonded and are soaked with absorbents. A layer of TPU film is adhered to each of the two flame-retardant foams on the outermost layer; and a double faced adhesive tape is adhered to one layer of TPU thin film. The invention also discloses a preparation process ofthe wave-absorbing foam, including: firstly preparing the absorbent, and soaking the flame-retardant foam in the absorbent; controlling the drying temperature to be 60-80 DEG C, drying the material for 1.5-2.0 hours to obtain the semi-finished product, sequentially bonding and assembling a plurality of flame-retardant foams with different absorbent contents after the semi-finished product is inspected to be qualified to obtain a plurality of layers of foams; then bonding a TPU film with the assembled multiple layers of foams, cutting and trimming the assembled foams, and finally inspecting thefinished product. The wave-absorbing foam is high in microwave absorption rate, high in strength and not prone to damage in the using process, slurry leakage is not likely to happen in the machiningprocess of the microwave-absorbing foam, and the rate of finished products is high.

Description

technical field [0001] The invention relates to the technical field of wave-absorbing materials, in particular to a wave-absorbing foam material and a preparation process thereof. Background technique [0002] Absorbing foam is a wave-absorbing material that uses foam as the base material. It is mainly used in clutter suppression, anti-electromagnetic interference, microwave anechoic chamber, RCS weakening, aerospace and other fields of communication and radar systems. The strength of traditional wave-absorbing foam is not high, and it is easy to be damaged during use. Moreover, in the traditional process, the yield of wave-absorbing foam is low, and there is a phenomenon of slurry leakage, which causes waste of absorbent and increases the cost. Contents of the invention [0003] In order to solve the problems existing in the prior art, the present invention provides a wave-absorbing foam material and its preparation process. The wave-absorbing foam material has high stren...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B5/18B32B5/32B32B27/40B32B27/06B32B7/12B32B37/12C08J9/40C08J9/42C08L101/00
CPCB32B5/18B32B5/32B32B7/12B32B27/065B32B27/40B32B37/12B32B2260/04B32B2260/046B32B2307/20C08J9/40C08J9/42C08J2300/00
Inventor 程海洋田袁
Owner 成都雷隐科技有限公司
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