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A kind of microwave absorbing material and preparation method thereof

A technology of microwave absorbing materials and resins, which is applied in chemical instruments and methods, and other chemical processes, can solve the problems of large dielectric loss, high dielectric constant, and poor bonding, and achieve the goal of solving processing difficulties and improving microwave-absorbing performance Effect

Active Publication Date: 2017-03-15
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The present invention solves the problem of Fe in existing microwave absorbing materials. 3 o 4 / TiO 2 The technical problems of poor combination, high dielectric constant and large dielectric loss provide a microwave absorbing material with good combination, low dielectric constant and small dielectric loss and its preparation method

Method used

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preparation example Construction

[0022] The invention provides a kind of preparation method of microwave absorbing material, and this method comprises the following steps:

[0023] S1, soaking the sponge with a resin solution and drying to form a resin-containing carrier;

[0024] S2. Immerse the carrier containing the resin in the solution of the ferric salt with the reducing agent, and the reducing agent reacts with the ferric salt to load Fe on the carrier containing the resin 3 o 4 ;

[0025] S3, dissolving and removing the resin in the product obtained in step S2 with a solvent;

[0026] S4, soak the product obtained in step S3 in the solution of isopropyl titanate, and the isopropyl titanate decomposes the product loaded TiO obtained in step S3 2 ;

[0027] S5, sintering the product obtained in step S4 to remove the sponge to obtain a microwave absorbing material.

[0028] According to the preparation method provided by the present invention, preferably, the higher the porosity of the sponge materi...

Embodiment 1

[0045] Cut high-density nano-sponge (BASF, EF-320, porosity 80%) into rings with an inner diameter of 5mm, an outer diameter of 19mm and a thickness of 1mm as a reaction carrier; 250g PU-3548 (polyurethane resin) resin (shrinkage rate 0.45%) was dissolved in 50mL DMF (dimethylformamide) to prepare a 5g / mL solution, the reaction carrier was soaked in 5gPU-3548 resin solution for 1h, and dried at 80°C for later use.

[0046] The material manufacturing process is:

[0047] ①. Add 2.6g FeCl 3 , 0.5g Na 3 Dissolve Ct and 4g of sodium acetate (NaAc) in 40mL of ethylene glycol, add a piece of reaction carrier, and stir magnetically for 2h; put the mixture in a 100mL stainless steel autoclave (pressure 0.5MPa) for 10h at 200°C, cool to room temperature, Clean with absolute ethanol and dry at 80°C;

[0048] ②. Soak the product carrier obtained in step ① in DMF solution for 2 hours, clean it with absolute ethanol and dry it at 80 degrees Celsius;

[0049] ③. Add 2mL (about 1.92g) of...

Embodiment 2

[0059] Cut high-density nano-sponge (BASF, EF-320, porosity 81%) into rings with an inner diameter of 5 mm, an outer diameter of 19 mm and a thickness of 1 mm as a reaction carrier; 100 g of polyvinyl alcohol (shrinkage rate of 0.6%) Dissolve it in 50mL of toluene, prepare a 2g / mL solution, soak the reaction carrier in the polyvinyl alcohol solution for 1 hour, and dry it at 80°C for later use.

[0060] The material manufacturing process is:

[0061] ①.Add 0.8g Fe(OH) 3 , 0.5g Na 3 Ct and 4g of sodium acetate (NaAc) were dissolved in 40mL of ethylene glycol, a piece of reaction carrier was added, and magnetically stirred for 2h; the mixture was placed in a 100mL stainless steel autoclave (pressure 0.8MPa) at 250°C for 8h, cooled to room temperature, Clean with absolute ethanol and dry at 80°C;

[0062] ②. Soak the product carrier obtained in step ① in toluene solution for 2 hours, clean it with absolute ethanol and dry it at 80 degrees Celsius;

[0063] ③.Add 0.42mL of iso...

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Abstract

The invention provides a microwave absorption material and a preparation method thereof. The preparation method comprises the following steps: S1) using a resin solution for infiltrating a sponge and drying the sponge to form a carrier containing resin; S2) infiltrating the carrier containing the resin in a trivalent ferric salt solution having a reducing agent, reacting the reducing agent and the trivalent ferric salt on the carrier containing the resin for loading Fe3O4; S3) using a solvent for dissolving the resin in the product obtained in the step 2) for removing the resin; S4) infiltrating the product obtained in the step 3) in an isopropyl titanate solution, decomposing isopropyl titanate on the product in the step 3) for loading TiO2; and 5) sintering the product obtained in the step 4) for removing the sponge to obtain the microwave absorption material. The microwave absorption material has the advantages of low dielectric constant and little dielectric loss.

Description

technical field [0001] The invention belongs to the field of preparation of microwave absorbing materials, and in particular relates to a microwave absorbing material for antennas and a preparation method thereof. Background technique [0002] With the continuous development of the IT industry, electromagnetic pollution and electromagnetic interference are becoming more and more serious. The research and development of materials with microwave absorption function has attracted widespread attention. Materials commonly used in the prior art to absorb microwaves include: ferromagnetic alloy powder, carbon black, zinc oxide and ferrite. [0003] Fe 3 o 4 and TiO 2 The composite material is the commonly used ferromagnetic alloy powder. Fe 3 o 4 Nano wave-absorbing materials have strong weather resistance, but it is difficult to meet the requirements of high dielectric constant and dielectric loss at the same time. The dielectric loss of TiO2 is small, and it will strongly ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K3/00
Inventor 刘厚胤孔宪君陈大军
Owner BYD CO LTD
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