阅读说明：本技术 一种耐高温的高磁导率吸波片材及其制备方法 (High-temperature-resistant high-permeability wave-absorbing sheet and preparation method thereof ) 是由 李俊 李喜雄 陈中艳 于 2019-10-23 设计创作，主要内容包括：本发明公开了耐高温的高磁导率吸波片材及其制备方法。该吸波片材包括以下重量组分：软磁合金粉100份,粘合剂10-20份,硫化剂0.5-3份,分散剂1-3份,有机溶剂150-200份。本发明的吸波片材,具有较高的磁导率和耐高温性能,在120℃时能够长久稳定地使用,相对于现有技术中只能在80℃使用的吸波片材,本申请中的吸波片材具有更长的使用寿命。(The invention discloses a high-temperature-resistant high-permeability wave-absorbing sheet and a preparation method thereof. The wave-absorbing sheet comprises the following components in parts by weight: 100 parts of soft magnetic alloy powder, 10-20 parts of adhesive, 0.5-3 parts of vulcanizing agent, 1-3 parts of dispersing agent and 200 parts of organic solvent 150-. The wave-absorbing sheet has high magnetic conductivity and high temperature resistance, can be stably used for a long time at 120 ℃, and has longer service life compared with the wave-absorbing sheet which can only be used at 80 ℃ in the prior art.)

1. A high-temperature-resistant high-permeability wave-absorbing sheet is characterized by comprising the following components in parts by weight:

2. the high-temperature-resistant high-permeability wave-absorbing sheet material as claimed in claim 1, wherein the soft magnetic alloy powder comprises one or more of sendust, sendust and sendust.

3. The high temperature resistant high permeability microwave absorbing sheet of claim 1 wherein the adhesive is nitrile rubber.

4. The high temperature resistant high magnetic permeability wave absorbing sheet according to claim 3, wherein the acrylonitrile butadiene rubber has an acrylonitrile content of more than 30%.

5. The high temperature resistant high magnetic permeability wave absorbing sheet according to claim 3, wherein the acrylonitrile butadiene rubber has an acrylonitrile content of more than 35%.

6. The high temperature resistant high permeability microwave absorbing sheet according to claim 3 wherein the nitrile rubber comprises one or more acrylonitrile containing nitrile rubbers.

7. The high-temperature-resistant high-permeability wave-absorbing sheet material as claimed in claim 1, wherein the vulcanizing agent is phenolic resin, and further comprises an active agent and an accelerator.

8. The high temperature resistant high permeability wave absorbing sheet according to claim 1, wherein the dispersant is an anionic dispersant, and the anionic dispersant is phosphate type.

9. The high-temperature-resistant high-permeability wave-absorbing sheet material as claimed in claim 1, wherein the organic solvent comprises one or more of ethyl acetate, butyl acetate, acetone and toluene.

10. A preparation method of a high-temperature-resistant high-permeability wave-absorbing sheet is characterized by comprising the following steps:

A. mixing soft magnetic alloy powder, a binder, a vulcanizing agent, a dispersing agent and an organic solvent, and stirring and dispersing at medium speed for 0.5-4h by using a planetary stirrer;

B. stirring at low speed for 12-36h in combination with defoaming treatment;

C. after the viscosity of the slurry is adjusted, a coating machine is used for tape casting, and a silicone oil-coated PET film is used as a carrier;

D. drying the membrane, vulcanizing and forming, wherein the hot pressing temperature is 150-.

Technical Field

The invention relates to the field of electromagnetic protection, in particular to a high-permeability wave-absorbing sheet material with high temperature resistance and a preparation method thereof.

Background

Electronic products represented by smart phones and computers are becoming more and more popular, and as electronic devices are developed to be small, thin, and multifunctional, circuit boards are also packaged as a large number of electronic components. Especially, the integration level and the signal transmission density of the smart phone are further improved when the smart phone enters the 5G era. This will bring about two major challenges, the first is that the electromagnetic interference of the electronic device is more serious, and the second is that the heat productivity of the electronic device is larger and the operating temperature is higher.

The electromagnetic wave absorbing material is a new need in the future 5G era, and can effectively convert harmful electromagnetic waves into energy to be dissipated, and inhibit electromagnetic interference of electronic equipment. Meanwhile, the electromagnetic wave absorbing material is required to be capable of stably operating at a higher temperature for a long period of time. In response to the demand for miniaturization and integration of electronic devices, electromagnetic wave absorbing materials are required to have high temperature resistance, high magnetic permeability, and as small a thickness as possible, which is continuously reduced toward 0.1 mm.

With the increasing use amount and integration level of electronic components, the wave-absorbing sheet is continuously developed towards thinning, which puts higher requirements on the magnetic conductivity and high temperature resistance of the wave-absorbing sheet.

Disclosure of Invention

The invention provides a high-temperature-resistant high-permeability wave-absorbing sheet and a preparation method thereof, which can solve one or more of the problems in the prior art.

The wave-absorbing material generally needs to work stably for a long time at 85 ℃, and the wave-absorbing sheet and the preparation method thereof can be used reliably at 120 ℃.

According to one aspect of the invention, the high-temperature-resistant high-permeability wave-absorbing sheet material comprises the following components in parts by weight:

the wave-absorbing sheet has the advantages that the wave-absorbing sheet has high magnetic conductivity and high temperature resistance, can be stably used for a long time at 120 ℃, and has longer service life compared with the wave-absorbing sheet which can only be used at 80 ℃ in the prior art.

In some embodiments, the soft magnetic alloy powder comprises one or more of sendust, and sendust.

In some embodiments, the binder is a high acrylonitrile content nitrile rubber. The wave-absorbing sheet has the beneficial effects that the wave-absorbing sheet integrally has excellent high-temperature resistance, and the production cost can be greatly saved.

In some embodiments, the acrylonitrile rubber has an acrylonitrile content of greater than 30%. This has the advantage that too low a level will degrade the heat resistance and strength of the wave absorbing plate.

In some embodiments, the acrylonitrile rubber has an acrylonitrile content of greater than 35%.

In some embodiments, the nitrile rubber comprises one or more acrylonitrile-containing nitrile rubbers. The nitrile butadiene rubber has the beneficial effects that various nitrile butadiene rubbers are mixed, so that the service performance of the product can be ensured, and the selection diversity can be provided.

In some embodiments, the curing agent is a phenolic resin, further comprising an activator and an accelerator. The curing agent has the advantages of promoting the curing of the adhesive, further improving the crosslinking degree of the product, improving the heat resistance, selecting the modified phenolic resin, being easy to disperse and fast in curing, and improving the curing rate by adding a proper amount of the active agent and the accelerator.

In some embodiments, the dispersant is an anionic dispersant, which is of the phosphate type. The dispersing agent has the beneficial effects that the dispersing agent has good compatibility, can fully mix and disperse organic components and inorganic soft magnetic alloy powder, has good anti-settling performance, and can improve the product performance.

In some embodiments, the organic solvent comprises one or more of ethyl acetate, butyl acetate, acetone, and toluene. The beneficial effects are that ethyl acetate and butyl acetate are environment-friendly and have little influence on the body.

According to another aspect of the invention, a preparation method of a high-temperature-resistant high-permeability wave-absorbing sheet is provided, which comprises the following steps:

A. mixing soft magnetic alloy powder, a binder, a vulcanizing agent, a dispersing agent and an organic solvent, and stirring and dispersing at medium speed for 0.5-4h by using a planetary stirrer;

B. stirring at low speed for 12-36h in combination with defoaming treatment;

C. after adjusting the viscosity of the slurry, carrying out tape casting by using a coating machine, wherein a silicon oil-coated polyethylene terephthalate (PET) film is used as a carrier; the viscosity here is only suitable for the requirements of the coating machine.

D. And drying the membrane obtained by casting, vulcanizing and molding by using a flat plate hot press, and hot-pressing in a lamination mode according to the thickness requirement, wherein the hot-pressing temperature is 150-200 ℃, the time is 10-60min, and the pressure is controlled at 5-30 MPa.

The wave-absorbing sheet prepared by the method has excellent high-temperature resistance and can be used for a long time at the temperature of 120 ℃.

Detailed Description

The present invention will be described in further detail with reference to examples.