Lightweight and broadband wave absorbing material with foam sandwich structure and method for producing same

A wave-absorbing material and interlayer structure technology, which is applied in the field of lightweight broadband electromagnetic wave structure absorbing materials and its preparation, can solve the problems of inability to prepare foam structure wave-absorbing materials, low mechanical properties of polyurethane soft foam, and poor low-frequency band effects, etc. , to achieve superior environmental performance, light surface density, and good low-frequency performance

Inactive Publication Date: 2010-05-05
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Yu Mingxun et al. (Ding Wenhao, Yu Mingxun, et al. Research on the microwave-absorbing properties of polyurethane foams containing chopped conductive fibers[J]. Engineering Plastics Application, 2007, 35(11): 20-22; Song Yuhua, Yu Mingxun , et al. Research on radar-absorbing polyurethane foam [J]. Engineering Plastics Application, 2006, 34(16): 13-16) Adding conductive chopped fibers with electrical loss as the main factor to polyurethane to prepare wave-absorbing foam , has a good absorbing effect in the high-frequency band, but the effect in the low-frequency band is not good; Shen Guozhu et al. Science Edition), 2008, 36(3): 379-382) combined conductive chopped carbon fiber and ferrite material, added to polyurethane to prepare wave-absorbing foam, achieved both electrical loss and magnetic los

Method used

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  • Lightweight and broadband wave absorbing material with foam sandwich structure and method for producing same
  • Lightweight and broadband wave absorbing material with foam sandwich structure and method for producing same
  • Lightweight and broadband wave absorbing material with foam sandwich structure and method for producing same

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Experimental program
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preparation example Construction

[0022] Preparation method of wave-absorbing foam material layer

[0023] 1. Polyurethane absorbing foam material

[0024] Step 1 Mix polyether polyol (mass parts: 100), mixed catalyst (0.15-0.5), foam stabilizer (1.5-3), foaming agent (8-18) to make a combined polyether (mixture A);

[0025] Step 2: Mix organic polyisocyanate (100-50) and wave-absorbing material components (1-20) evenly to make mixture B;

[0026] Step 3 mixes the mixture A and B of step 1 and step 2 evenly to make mixture C;

[0027] Step 4: Rapidly inject the compound C in step 3 into the preheated (temperature 40°C-60°C) mold, and lock the mold to make it foam. Open the mold after 30 to 60 minutes to get the desired finished product.

[0028] Process flow chart such as figure 2 shown.

[0029] Wherein, the polyether polyols in step 1 include sucrose polyethers, sorbitol polyethers, glycerol polyethers and aromatic polyethers; catalysts include tertiary amine compounds (such as triethylamine, triethyl...

Embodiment 1

[0078]The chopped magnetic carbon fiber (1.5 mm in length) with a mass part of 1 was added to the raw materials for preparing the polyurethane absorbing foam according to the aforementioned preparation process of the polyurethane absorbing foam, and a polyurethane absorbing foam with a single layer thickness of 10 mm was prepared. Material Single layer board (sandwich).

[0079] Press the sandwich core prepared above with a 2mm thick glass fiber board (panel) and a 3mm thick magnetic carbon fiber absorbing reflection layer (bottom plate) figure 1 Bonded together to form a sandwich structure absorber.

[0080] The reflectivity of the material is less than -1dB in the entire 4-14GHz frequency band, less than -5dB in the 14-17 frequency band, and has an absorption peak at 15.7, reaching -7.4dB.

Embodiment 2

[0082] The chopped magnetic carbon fiber (length is 2.5mm) of 1 mass part is added to the raw material for preparing the phenolic resin wave-absorbing foam material according to the preparation process of the aforementioned phenolic resin wave-absorbing foam material, and a single-layer thickness of 10mm is prepared. Single layer panel (sandwich) of absorbing foam material.

[0083] Press the sandwich core prepared above with a 2mm thick glass fiber board (panel) and a 3mm thick magnetic carbon fiber absorbing reflection layer (bottom plate) figure 1 Bonded together to form a sandwich structure absorber.

[0084] The reflectivity of this material is less than -1dB in the whole 3-15GHz frequency band, less than -5dB in the 15-17.5 frequency band, and has an absorption peak at 16.2, reaching -7.8dB.

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Abstract

The invention relates to a lightweight and broadband wave absorbing material with foam sandwich structure, comprising a panel 1, a sandwich layer 2 and a bottom plate 3. The panel 1 is a wave-transparent material layer; the sandwich layer 2 is wave absorbing resin foam; and the bottom plate 3 is an electromagnetic wave absorbing and reflecting layer. The method for producing the lightweight and broadband wave absorbing material with foam sandwich structure comprises the steps of mixing raw materials, foaming the mixed raw material, curing the mixed raw material to obtain monolayer foam wave absorbing materials and adhering the monolayer foam materials to form multi-layer foam wave absorbing material. The lightweight and broadband wave absorbing material with foam sandwich structure has good low-frequency performance, broad absorption band, light surface density, superior environmental performance and the like. The method is mature and stable, can be used for the large-scale continuous production and is easy to realize the industrialization.

Description

technical field [0001] The invention belongs to the technical field of functional materials, and relates to a lightweight broadband electromagnetic wave structure 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 been widely researched and prepared. The current absorbing materials are mainly ferrite, metal powder, polycrystalline / amorphous fibers. However, due to the lack of load-carrying capacity, high surface density, and poor weather resistance of coated wave-absorbing materials, its application prospects in some fields are limited, especially it is difficult to meet the requirements for the preparation of stealth aircraft. [0003] Compared with the radar absorbing coating developed earlier, the stealth composite material can provide electrical and aircraft structure designers wi...

Claims

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Application Information

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IPC IPC(8): B32B27/00B32B27/20B32B37/12
Inventor 黄小忠黎炎图杜作娟王超英
Owner CENT SOUTH UNIV
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