阅读说明：本技术 大容量高频变压器单元磁芯材料的制备方法 (Preparation method of magnetic core material of high-capacity high-frequency transformer unit ) 是由 詹建朝 于 2018-10-16 设计创作，主要内容包括：本发明提供了大容量高频变压器单元磁芯材料的制备方法,包括以下制备步骤：(1)将Fe(NO<Sub>3</Sub>)<Sub>3</Sub>·9H<Sub>2</Sub>0和Fe(NO<Sub>3</Sub>)<Sub>2</Sub>·6H<Sub>2</Sub>O配置成水溶液,在40-60℃,pH11.0条件下反应得到磁性基质；(2)将(CH<Sub>3</Sub>COO)<Sub>2</Sub>Zn·2H<Sub>2</Sub>O、Cu(NO<Sub>3</Sub>)<Sub>2</Sub>·3H<Sub>2</Sub>O、磁性基质、聚乙烯吡咯烷酮和碱液反应20-40min,然后加入铝酸镁,陈化4-8h,产物洗涤至中性,干燥得到磁性材料；(3)将磁性材料与100mL去离子水混合,然后加入改性剂,加热搅拌,抽滤,将沉淀物洗涤至中性,干燥后得到表面活化后的磁性材料；(4)取活化后的磁性材料,加入N,N-二甲基甲酰胺、聚酰胺酸,在氮气保护下进行反应,洗涤沉淀物,干燥后得到大容量高频变压器单元磁芯材料。本发明得到的大容量高频变压器单元磁芯材料有比重小、抗冲击性能和抗振荡性能较好。(The invention provides a preparation method of a magnetic core material of a high-capacity high-frequency transformer unit, which comprises the following preparation steps: (1) mixing Fe (NO) 3 ) 3 ·9H 2 0 and Fe (NO) 3 ) 2 ·6H 2 Preparing O into aqueous solution, and reacting at 40-60 deg.C and pH11.0 to obtain magnetic matrix; (2) will (CH) 3 COO) 2 Zn·2H 2 O、Cu(NO 3 ) 2 ·3H 2 Reacting O, the magnetic substrate, polyvinylpyrrolidone and alkali liquor for 20-40min, then adding magnesium aluminate, aging for 4-8h, washing the product to be neutral, and drying to obtain a magnetic material; (3) mixing a magnetic material with 100mL of deionized water, adding a modifier, heating, stirring, carrying out suction filtration, washing a precipitate to be neutral, and drying to obtain a surface-activated magnetic material; (4) and adding N, N-dimethylformamide and polyamic acid into the activated magnetic material, reacting under the protection of nitrogen, washing the precipitate, and drying to obtain the high-capacity high-frequency transformer unit magnetic core material. The invention obtains a high-capacity high-frequency transformerThe unit magnetic core material has the advantages of small specific gravity, good impact resistance and good oscillation resistance.)

1. The preparation method of the magnetic core material of the high-capacity high-frequency transformer unit is characterized by comprising the following preparation steps of:

(1) mixing Fe (NO)₃)₃·9H₂0 and Fe (NO)₃)₂·6H₂O is dissolved in deionized water to prepare a 40 wt% aqueous solution, and then the solution is added into a 500mL three-neck flaskStirring and heating to 40-60 ℃, dropwise adding 25% ammonia water, adjusting the pH to 11.0, stirring and reacting for 20-40min, collecting the precipitate, and repeatedly washing to neutrality to obtain a magnetic substrate;

(2) will (CH)₃COO)₂Zn·2H₂O and Cu (NO)₃)₂·3H₂O is as Zn²⁺And Cu²⁺Mixing the materials in a molar ratio of 2:1, preparing a nitrate aqueous solution, adding the nitrate aqueous solution into a three-neck flask, and then adding the nitrate aqueous solution into the three-neck flask according to Fe²⁺And Zn²⁺Measuring the magnetic matrix in the step (1) at a molar ratio of 0.2:1, adding the magnetic matrix into a three-necked flask, uniformly stirring, adding polyvinylpyrrolidone and alkali liquor accounting for 3% of the total amount of the system, stirring for 20-40min, adding magnesium aluminate accounting for 9% of the total amount of the system, adjusting the pH value to 11.0, raising the temperature to 70-90 ℃, aging for 4-8h, separating a product by using a magnetic separation device, repeatedly washing to be neutral, and drying for 30h at 70 ℃ to obtain a magnetic material;

(3) mixing 20g of the magnetic material prepared in the step (2) with 100mL of deionized water, then adding 1.2g of a modifier, heating to 75-95 ℃, mechanically stirring for 1-3h, carrying out suction filtration, washing the precipitate to be neutral, and then drying for 2h at 80 ℃ to obtain a surface-activated magnetic material;

(4) and (3) adding 27 parts of the magnetic material activated in the step (3) into a reactor, adding 36 parts of N, N-dimethylformamide, then adding 5 parts of polyamic acid, reacting under the protection of nitrogen, naturally cooling after reaction, washing the precipitate with absolute ethyl alcohol for 3 times, then washing with clear water for 3 times, and drying at 60 ℃ for 24 hours to obtain the high-capacity high-frequency transformer unit magnetic core material.

2. A method for producing a large capacity high frequency transformer unit magnetic core material in accordance with claim 1, wherein Fe in the step (1)²⁺And Fe³⁺Is 1.4: 2.5.

3. The method for preparing a high capacity high frequency transformer unit magnetic core material according to claim 1, wherein the CO in the lye of step (2)₃ ^2-And Fe³⁺In a molar ratio of 2:1, OH^-With CO₃ ^2-The molar ratio was 3: 1.

4. A method for preparing a high-capacity high-frequency transformer unit magnetic core material according to claim 1, wherein the modifier in the step (3) is barium stearate and zinc stearate in a weight ratio of 1:2, mixing the components.

5. A method for preparing a high capacity high frequency transformer unit magnetic core material according to claim 1, wherein the reaction temperature is 60-80 ℃ and the reaction time is 8-12 h.

Technical Field

The invention relates to a magnetic material, in particular to a preparation method of a magnetic core material of a high-capacity high-frequency transformer unit.

Background

With the development of science and technology, high and new technologies are applied in fields, the performance requirements of materials are higher and higher, electronic devices are developed towards light weight and miniaturization, comprehensive performance of materials is considered in multiple aspects when the materials are selected, materials which are too high in specific gravity and difficult to process are difficult to apply, and therefore the processing performance and the use performance of the materials are improved, the magnetic materials are excellent in performance, fields pay attention and research, the magnetic materials are modified, novel materials with more excellent performance are obtained, in the material synthesis process, a modifying substance is introduced, the magnetic performance of the magnetic materials can be well improved, the mechanical performance of the materials is improved through physical and chemical blending modification in steps, and the obtained composite materials realize multifunctional compounding and synergistic interaction, and have an application prospect in the field.

Disclosure of Invention

The technical problem to be solved is as follows:

the invention aims to provide a preparation method of high-capacity high-frequency transformer unit magnetic core materials, and the obtained high-capacity high-frequency transformer unit magnetic core materials have the advantages of small specific gravity, light weight, easiness in processing, and better impact resistance and oscillation resistance.

The technical scheme is as follows:

the invention provides a preparation method of a magnetic core material of a high-capacity high-frequency transformer unit, which comprises the following preparation steps: (1) mixing Fe (NO)₃)₃·9H₂0 and Fe (NO)₃)₂·6H₂Dissolving O in deionized water to prepare 40 wt% of water solution, adding the water solution into a 500mL three-necked flask, continuously stirring, heating to 40-60 ℃, dropwise adding 25% ammonia water, adjusting the pH to 11.0, stirring for reacting for 20-40min, collecting precipitate, and repeatedly washing to neutrality to obtain a magnetic substrate;

(2) will (CH)₃COO)₂Zn·2H₂O and Cu (NO)₃)₂·3H₂O is as Zn²⁺And Cu²⁺Mixing the materials in a molar ratio of 2:1, preparing a nitrate aqueous solution, adding the nitrate aqueous solution into a three-neck flask, and then adding the nitrate aqueous solution into the three-neck flask according to Fe²⁺And Zn²⁺Measuring the magnetic matrix in the step (1) at a molar ratio of 0.2:1, adding the magnetic matrix into a three-necked flask, uniformly stirring, adding polyvinylpyrrolidone and alkali liquor accounting for 3% of the total amount of the system, stirring for 20-40min, adding magnesium aluminate accounting for 9% of the total amount of the system, adjusting the pH value to 11.0, raising the temperature to 70-90 ℃, aging for 4-8h, separating a product by using a magnetic separation device, repeatedly washing to be neutral, and drying for 30h at 70 ℃ to obtain a magnetic material;

(3) mixing 20g of the magnetic material prepared in the step (2) with 100mL of deionized water, then adding 1.2g of a modifier, heating to 75-95 ℃, mechanically stirring for 1-3h, carrying out suction filtration, washing the precipitate to be neutral, and then drying for 2h at 80 ℃ to obtain a surface-activated magnetic material;

(4) and (3) adding 27 parts of the magnetic material activated in the step (3) into a reactor, adding 36 parts of N, N-dimethylformamide, then adding 5 parts of polyamic acid, reacting under the protection of nitrogen, naturally cooling after reaction, washing the precipitate with absolute ethyl alcohol for 3 times, then washing with clear water for 3 times, and drying at 60 ℃ for 24 hours to obtain the high-capacity high-frequency transformer unit magnetic core material.

Preferably, the preparation method of the magnetic core material of the high-capacity high-frequency transformer unit comprises the step (1) of Fe²⁺And Fe^{3 +}Is 1.4: 2.5.

Preferably, the preparation method of the magnetic core material of the high-capacity high-frequency transformer unit comprises the step (2) of adding CO in alkali liquor₃ ^2-And Fe³⁺In a molar ratio of 2:1, OH^-With CO₃ ^2-The molar ratio was 3: 1.

Preferably, in the preparation method of the magnetic core material of the high-capacity high-frequency transformer unit, the modifier in the step (3) is formed by mixing barium stearate and zinc stearate according to the weight ratio of 1: 2.

Preferably, the reaction temperature of the preparation method of the magnetic core material of the high-capacity high-frequency transformer unit is 60-80 ℃, and the reaction time is 8-12 h.

Has the advantages that:

the magnetic core material of the high-capacity high-frequency transformer unit prepared by the invention has the advantages of small specific gravity, light weight, easy processing, good impact resistance and oscillation resistance, excellent magnetic property in a high-frequency range, initial conductivity of 6.32 at 1000HZ, small influence of external environment temperature on the conductivity, and mu within-55 DEG C_iThe temperature change rate of the catalyst is only 0.07 percent DEG C^-1The performance is stable, and the practical application environment is very wide in .

Detailed Description

The following examples are presented to enable one of ordinary skill in the art to more fully understand the present invention and are not intended to limit the invention in any way.