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Preparation method of water-based nano magnetic fluid

A nano-magnetic fluid and water-based technology, which is applied in the manufacture of magnetic objects, magnetic liquids, inductors/transformers/magnets, etc., can solve the problems of unfavorable expansion of production, complicated process flow, and complicated operation process, and achieve easy expansion of production and raw materials. Cheap and easy to obtain, the effect of simple preparation process

Pending Publication Date: 2021-02-02
BEIJING UNIV OF CHEM TECH +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] For example, the Chinese Patent Publication No. is CN 101136277A, titled "A Water-Based Magnetic Fluid Material and Its Preparation Method". The patent first uses the chemical co-precipitation method to prepare nano-Fe 3 o 4 particles, and then modify them by coating with sucrose to prepare water-based magnetic fluids, but this method uses synthesis and then modification, and the modification time is long, and the operation process is complicated, which is not conducive to further expansion of production
[0006] Another example is the Chinese Patent Publication No. CN 101256870A, titled "Double-coated water-based magnetic fluid and its preparation method", which uses medicinal agar and polyethylene glycol to realize nano-Fe 3 o 4 The preparation of water-based ferrofluid by double-layer coating is complicated. The particle size of the finally obtained composite particles is relatively large, about 45nm. Due to the coating of surfactant, the saturation magnetization of the ferrofluid is low. further application
However, the water-based magnetic fluid prepared according to the above conventional methods usually has serious particle agglomeration, which affects its mechanical properties; the high amount of surfactant added affects its magnetic properties; the process is complicated, which affects production costs

Method used

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  • Preparation method of water-based nano magnetic fluid
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  • Preparation method of water-based nano magnetic fluid

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preparation example Construction

[0050] As an aspect of the present invention, a kind of preparation method of water-based nano-magnetic fluid of the present invention comprises the following steps:

[0051] S1, dissolving ferrous ferrous salt and ferric salt in an acidic solution to prepare a mixed solution of ferric salt, which is recorded as feed solution A;

[0052] S2, dissolve the alkali source in deionized water to prepare lye, which is recorded as feed liquid B;

[0053] S3, when feeding inert gas N 2 Under certain reaction conditions, the material liquid B is mixed with the material liquid A, heated in a water bath, stirred, and fully reacted;

[0054] S4, add tensio-active agent in the reaction solution after step S3 reaction, water bath heating, stirring, after the completion of the reaction, black precipitation nano iron ferric oxide particles are produced, continue to pass N 2 , and cooled to room temperature;

[0055] S5, collect black precipitate, use the mixed solution of organic solvent an...

Embodiment 1

[0072] A preparation method of water-based nano-magnetic fluid, comprising the steps of:

[0073] 1) Prepare feed solution A: weigh 1.49g FeCl 2 4H 2 O and 4.06 g FeCl 3 ·6H 2 O was dissolved in 60 mL of dilute hydrochloric acid solution of 0.24 mol / L.

[0074] 2) Preparation of liquid B: 20mL 25wt.%NH 3 ·H 2 O was added to 30mL deionized water and diluted to 10wt.% for later use.

[0075] 3) Pour the material liquid A into a three-necked flask, and feed N 2 Fifteen minutes, remove the oxygen in the system, add feed liquid B to feed liquid A, and mechanically stir at a water bath heating temperature of 90°C.

[0076] 4) After mechanical stirring for 1 h, add 8 mL of sodium citrate solution with a concentration of 0.12 mol / L, and continue mechanical stirring for 1 h under heating in a water bath. After the reaction is complete, cool to room temperature.

[0077] 5) Collect the black precipitate and use a mixed solution of acetone and water for centrifugal washing, wherein...

Embodiment 2

[0081] A preparation method of water-based nano-magnetic fluid, comprising the steps of:

[0082] 1) Prepare feed solution A: weigh 1.49g FeCl 2 4H 2 O and 4.06 g FeCl 3 ·6H 2 O was dissolved in 60 mL of dilute hydrochloric acid solution of 0.24 mol / L.

[0083] 2) Preparation of liquid B: 20mL 25wt.%NH 3 ·H 2 O was added to 30mL deionized water and diluted to 10wt.% for later use.

[0084] 3) Pour the material liquid A into a three-necked flask, and feed N 2 Fifteen minutes, remove the oxygen in the system, add feed liquid B to feed liquid A, and mechanically stir at a water bath heating temperature of 90°C.

[0085] 4) After mechanical stirring for 1 h, add 8 mL of sodium citrate solution with a concentration of 0.12 mol / L, and continue mechanical stirring for 1 h under heating in a water bath. After the reaction is complete, cool to room temperature.

[0086] 5) Collect the black precipitate and use a mixed solution of acetone and water for centrifugal washing, where...

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Abstract

The invention discloses a preparation method of a water-based nano magnetic fluid. The method comprises the following steps of: dissolving ferrous salt and ferric salt in an acidic solution to preparea ferric salt mixed solution, and marking the ferric salt mixed solution as a feed liquid A; dissolving an alkali source in deionized water to prepare alkali liquor, and marking the alkali liquor asfeed liquid B; under the reaction condition of introducing inert gas N2, mixing the feed liquid B with the feed liquid A, heating the mixed solution in a water bath, and performing stirring to carry out a full reaction; adding a surfactant, heating an obtained mixed solution in a water bath, performing stirring, generating black precipitated nano ferroferric oxide particles after finishing the reaction, continuously introducing N2, and cooling to room temperature; collecting the black precipitates, and carrying out centrifugal washing by using a mixed solution of an organic solvent and water;and dispersing the precipitates in deionized water, removing the organic solvent, and carrying out ultrasonic dispersion to obtain the water-based nano magnetic fluid. The water-based magnetic fluid product is uniform in size, and the average particle size of the product is 5-25 nm; the water-based magnetic fluid product is good in dispersion, single in phase and good in stability; and stable dispersion of the product for more than or equal to 6 months can be realized after the product is modified.

Description

technical field [0001] The invention relates to the technical field of magnetic fluid preparation, in particular to a method for preparing water-based nano-magnetic fluid. Background technique [0002] In today's society, magnetic materials are an important pillar of the national defense industry and the national economy, and are closely related to many fields of the national economy. As a new type of magnetic material, nano-magnetic material has superior properties that conventional magnetic materials do not have. It is a research hotspot in the field of materials in the world today, and it is a new type of functional material with broad application prospects. However, due to the activity of the surface of the nano-magnetic material and the attractive force between the particles, the aggregation of the magnetic particles is very easy to occur. According to literature reports, common magnetic materials include Fe, Co, Ni and other metal nanoparticles, Fe 3 o 4 , γ-Fe 2 o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/44H01F41/00
CPCH01F1/445H01F41/00
Inventor 王洁欣郑媛媛钟杰曾晓飞陈建峰
Owner BEIJING UNIV OF CHEM TECH
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