阅读说明：本技术 一种无线充电用隔磁片及其制备方法 (Magnetic separation sheet for wireless charging and preparation method thereof ) 是由 刘孝军 朱仁胜 朱国栋 朱国辉 于 2019-08-28 设计创作，主要内容包括：一种无线充电用隔磁片及其制备方法,按重量份计取三氧化二铁、氧化镍、氧化铜、氧化硅、氧化铝、磁粉,并将其混合搅拌均匀,对其进行破碎,造粒；将步骤一中的物料一再次进行研磨,在其过程中,加入粘结剂、增塑剂、偶联剂、分散剂；将混合物料二进行烘干,去除水分；经步骤三中的不含水分的混合物料通过粉末成型压机,制成生磁片；将生磁片表面沿不同的切割线切割成所需磁片的形状；将步骤三中的生磁片氧化烧结成熟磁片；对熟磁片的上下表面进行磨加工；在烘干后的熟磁片的上下表面粘贴薄膜胶带进行保护。本发明降低了磁片厚度,简化生产流程,提高成品率,且磁片在长期使用过程中不会生锈,延长其使用寿命。(a magnetic separation sheet for wireless charging and a preparation method thereof are disclosed, wherein ferric oxide, nickel oxide, copper oxide, silicon oxide, aluminum oxide and magnetic powder are taken according to the parts by weight, mixed and stirred uniformly, crushed and granulated; grinding the material I in the step I again, and adding a binder, a plasticizer, a coupling agent and a dispersing agent in the process; drying the mixed material II to remove water; the moisture-free mixed material in the third step passes through a powder forming press to prepare a raw magnetic sheet; cutting the surface of the magnet sheet into the shape of the required magnet sheet along different cutting lines; oxidizing and sintering the magnetic sheets in the third step to obtain mature magnetic sheets; grinding the upper and lower surfaces of the cooked magnetic sheet; and sticking film adhesive tapes on the upper and lower surfaces of the dried cooked magnetic sheets for protection. The invention reduces the thickness of the magnetic sheet, simplifies the production flow, improves the yield, prevents the magnetic sheet from rusting in the long-term use process and prolongs the service life of the magnetic sheet.)

1. the magnetic shield sheet for wireless charging is characterized by comprising the following raw materials in parts by weight: 10-30 parts of ferric oxide, 10-30 parts of nickel oxide, 10-30 parts of copper oxide, 10-30 parts of silicon oxide, 10-30 parts of aluminum oxide, 20-40 parts of magnetic powder, 5-10 parts of binder, 5-10 parts of plasticizer, 5-10 parts of coupling agent and 5-10 parts of dispersing agent.

2. the magnetic separation sheet for wireless charging according to claim 1, which is prepared from the following raw materials: 10 parts of ferric oxide, 10 parts of nickel oxide, 10 parts of copper oxide, 10 parts of silicon oxide, 10 parts of aluminum oxide, 20 parts of magnetic powder, 5 parts of binder, 5 parts of plasticizer, 5 parts of coupling agent and 5 parts of dispersing agent.

3. The magnetic separation sheet for wireless charging according to claim 1, which is prepared from the following raw materials: 30 parts of ferric oxide, 30 parts of nickel oxide, 30 parts of copper oxide, 30 parts of silicon oxide, 30 parts of aluminum oxide, 40 parts of magnetic powder, 10 parts of binder, 10 parts of plasticizer, 10 parts of coupling agent and 10 parts of dispersing agent.

4. The preparation method of the magnetism isolating sheet for wireless charging according to claim 1, comprising the steps of:

The method comprises the following steps: taking 10-30 parts of ferric oxide, 10-30 parts of nickel oxide, 10-30 parts of copper oxide, 10-30 parts of silicon oxide, 10-30 parts of aluminum oxide and 20-40 parts of magnetic powder according to parts by weight, mixing and stirring uniformly, crushing the mixture, and granulating to obtain a mixed material I;

Step two: grinding the mixture I in the step I again, and adding a binder, a plasticizer, a coupling agent and a dispersing agent in the process; obtaining a mixed material II:

Step three: drying the mixed material II to remove water;

Step four: the moisture-free mixed material in the third step passes through a powder forming press to prepare a raw magnetic sheet;

step five: cutting the surface of the magnet sheet into the shape of the required magnet sheet along different cutting lines;

step six: oxidizing and sintering the magnetic sheets in the third step to obtain mature magnetic sheets;

step seven: grinding the upper and lower surfaces of the cooked magnetic sheet;

step eight: putting the grinded cooked magnetic sheets into a cutting machine for cutting;

Step nine: cleaning the cut cooked magnetic sheets;

step ten: drying the cleaned cooked magnetic sheets to remove water;

step eleven: and sticking film adhesive tapes on the upper and lower surfaces of the dried cooked magnetic sheets for protection.

5. The method for preparing a magnetic separator for wireless charging according to claim 4, wherein the thickness of the film tape is not more than 8 μm.

6. the method for preparing a magnetism-isolating sheet for wireless charging according to claim 4, wherein the cleaning is performed in an ultrasonic cleaning step in the ninth step.

Technical Field

the invention relates to a magnetism isolating sheet, in particular to a magnetism isolating sheet for wireless charging and a preparation method thereof, and belongs to the technical field of wireless charging.

Background

With the continuous development of information technology, the application of wireless charging technology and NFC technology is wider and wider, and more attention is paid to the wireless charging technology and the NFC technology; the wireless charger is a device which charges by utilizing the electromagnetic wave induction principle, a coil is respectively arranged at a transmitting end and a receiving end, the coil of the transmitting end is connected with a wired power supply to generate an electromagnetic signal, and the coil of the receiving end induces the electromagnetic signal of the transmitting end to generate current to charge a battery; the magnetic isolation sheet is attached to the antenna at the transmitting end, so that the magnetic field intensity of the coil can be enhanced, and a high magnetic convergence effect is achieved; the magnetic sheet is placed on the receiving terminal antenna to prevent the metal conductor from attenuating and interfering the magnetic field, so that the metal isolation effect is achieved, the energy waste is prevented, and the charging efficiency is improved; the magnetism isolating sheet is an indispensable part in the wireless charging equipment, plays a role in electromagnetic isolation, and can effectively avoid energy loss in wireless transmission, so the requirement on the magnetism isolating sheet is a sheet with a sufficiently large effective area, that is, the larger the area of the magnetism isolating sheet is, the larger the transmission power is, the thinner the magnetism isolating sheet is, the more the space is saved, and the weight of the anode is reduced.

Disclosure of Invention

aiming at the defects of the prior art, the invention provides the magnetism isolating sheet for wireless charging and the preparation method thereof, so that the thickness of the magnetism isolating sheet is reduced, the magnetism isolating sheet fully reacts in the sintering process, and the yield of the magnetism isolating sheet is improved.

a magnetic separation sheet for wireless charging comprises the following raw materials in parts by weight: 10-30 parts of ferric oxide, 10-30 parts of nickel oxide, 10-30 parts of copper oxide, 10-30 parts of silicon oxide, 10-30 parts of aluminum oxide, 20-40 parts of magnetic powder, 5-10 parts of binder, 5-10 parts of plasticizer, 5-10 parts of coupling agent and 5-10 parts of dispersing agent.

As a further improvement of the invention, the feed additive consists of the following raw materials: 10 parts of ferric oxide, 10 parts of nickel oxide, 10 parts of copper oxide, 10 parts of silicon oxide, 10 parts of aluminum oxide, 20 parts of magnetic powder, 5 parts of binder, 5 parts of plasticizer, 5 parts of coupling agent and 5 parts of dispersing agent.

As a further improvement of the invention, the feed additive consists of the following raw materials: 30 parts of ferric oxide, 30 parts of nickel oxide, 30 parts of copper oxide, 30 parts of silicon oxide, 30 parts of aluminum oxide, 40 parts of magnetic powder, 10 parts of binder, 10 parts of plasticizer, 10 parts of coupling agent and 10 parts of dispersing agent.

A preparation method of a magnetic separation sheet for wireless charging comprises the following steps:

The method comprises the following steps: weighing ferric oxide, nickel oxide, copper oxide, silicon oxide, aluminum oxide and magnetic powder in parts by weight, mixing and stirring uniformly, crushing the mixture, and granulating to obtain a mixed material I;

step two: grinding the mixture I in the step I again, and adding a binder, a plasticizer, a coupling agent and a dispersing agent in the process; obtaining a mixed material II:

step three: drying the mixed material II to remove water;

Step four: the moisture-free mixed material in the third step passes through a powder forming press to prepare a raw magnetic sheet;

step five: cutting the surface of the magnet sheet into the shape of the required magnet sheet along different cutting lines;

Step six: oxidizing and sintering the magnetic sheets in the third step to obtain mature magnetic sheets;

step seven: grinding the upper and lower surfaces of the cooked magnetic sheet;

step eight: putting the grinded cooked magnetic sheets into a cutting machine for cutting;

step nine: cleaning the cut cooked magnetic sheets;

step ten: drying the cleaned cooked magnetic sheets to remove water;

Step eleven: and sticking film adhesive tapes on the upper and lower surfaces of the dried cooked magnetic sheets for protection.

As a further improvement of the invention, the thickness of the film adhesive tape does not exceed 8 um.

as a further improvement of the invention, in the ninth step, the cleaning is performed in ultrasonic cleaning.

compared with the prior art, the thickness of the magnetic sheet is reduced, the magnetic sheet fully reacts in the sintering process, the yield of the magnetic sheet is improved, the nickel oxide is added into the raw materials, the magnetic sheet does not rust in the long-term use process, and the service life of the magnetic sheet is prolonged.

Detailed Description

the present invention will be described in further detail by way of examples.