Method for preparing magnetofluid ink by using nanometer magnetic powder

A nano-magnetic powder and magnetic fluid technology, applied in the printing field, can solve the problems of easy rubbing off, poor stability, etc., and achieve the effects of easy control, adjustable viscosity, and simple process

Inactive Publication Date: 2014-09-24
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention proposes a method for preparing magnetic fluid ink by using nano-magnetic powder, which is used to overcome the disadvantages of easy rubbing off and poor stability of magnetic fluid ink printed matter in the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] (1) Preparation of Fe 3 o 4 Magnetic powder

[0016] Magnetic nanoparticles were prepared by ultrasonic-assisted chemical co-precipitation method, and 30 g of FeCl 3 ·6H 2 O solid and 15 g of FeSO 4 ·7H 2 O powder, mix and dissolve it in deionized water, then put it into a constant temperature water bath, keep the temperature at 85°C; after keeping it warm for 8 minutes, measure 80ml of 25-28% NH 3 ·H 2 O was quickly added to the beaker and kept stirring. After 12 minutes of reaction, 3g of sodium oleate powder was added, and the stirring was continued for 10 minutes to obtain black Fe 3 o 4 The turbid solution was left to stand under a magnetic field until it separated, the supernatant was removed, and the lower layer of Fe was washed several times with deionized water and acetone. 3 o 4 colloid; dried to Fe 3 o 4 Magnetic nanoparticles, where Fe 3 o 4 The particle size is 8nm;

[0017] (2) Preparation of magnetic fluid ink

[0018] Add 1ml of surfactant...

Embodiment 2

[0020] (1) Preparation of Fe 3 o 4 Magnetic powder

[0021] Magnetic nanoparticles were prepared by ultrasonic-assisted chemical co-precipitation method, and 80 g of FeCl was weighed 3 ·6H 2 O solid and 50 g of FeSO 4 ·7H 2 O powder, mix and dissolve it in deionized water, then put it into a constant temperature water bath, keep the temperature at 55°C; after keeping it warm for 10 minutes, measure 150ml of 25-28% NH 3 ·H 2 O was quickly added to the beaker and kept stirring. After 7 minutes of reaction, 30g of sodium oleate powder was added, and the stirring was continued for 60 minutes to obtain black Fe 3 o 4 The turbid solution was left to stand under a magnetic field until it separated, the supernatant was removed, and the lower layer of Fe was washed several times with deionized water and acetone. 3 o 4 colloid; dried to Fe 3 o 4 Magnetic nanoparticles, where Fe 3 o 4 The particle size is 15nm;

[0022] (2) Preparation of magnetic fluid ink

[0023] Add 20...

Embodiment 3

[0025] (1) Preparation of Fe 3 o 4 Magnetic powder

[0026] Magnetic nanoparticles were prepared by ultrasonic-assisted chemical co-precipitation method, and 50 g of FeCl 3 ·6H 2 O solid and 23 g of FeSO 4 ·7H 2 O powder, mix and dissolve it in deionized water, then put it in a constant temperature water bath, keep the temperature at 70°C; after keeping it warm for 12 minutes, measure 110ml of 25-28% NH 3 ·H 2 O was quickly added to the beaker and kept stirring. After reacting for 9 minutes, 16g of sodium oleate powder was added, and stirring was continued for 30 minutes to obtain black Fe 3 o 4 The turbid solution was left to stand under a magnetic field until it separated, the supernatant was removed, and the lower layer of Fe was washed several times with deionized water and acetone. 3 o 4 colloid; dried to Fe 3 o 4 Magnetic nanoparticles, where Fe 3 o 4 The particle size is 11nm;

[0027] (2) Preparation of magnetic fluid ink

[0028] Add 10ml of surfactant ...

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Abstract

The invention provides a method for preparing magnetofluid ink by using nanometer magnetic powder, and belongs to the field of printing. The magnetofluid ink is composed of the nanometer magnetic powder and printing ink. Firstly, Fe3O4 magnetic nano-particles are prepared with the chemical coprecipitation method, then an appropriate amount of surface active agent is added and dispersed in the ink, and the magnetofluid ink high in stability is prepared. According to the method, the nanometer magnetic powder is directly added to the printing ink and evenly dispersed in the ink to form stable fluid, and therefore the magnetofluid ink is obtained. Meanwhile, the magnetofluid ink prepared with the method has the advantages of being simple in process, high in magnetic induction intensity, controllable in viscosity and the like, so that industrial mass production is convenient to achieve.

Description

field of invention [0001] The invention relates to a method for preparing magnetic fluid ink by using nanometer magnetic powder, which belongs to the field of printing. Background technique [0002] Printing with magnetic fluid ink is an important anti-counterfeiting technology. Magnetic fluid ink refers to the printing ink mixed with strong magnetic powder. This magnetic powder is not only the colorant of the ink, but also easily arranged evenly in the magnetic field, retaining a high residual magnetism, so that the printed matter can see the text and pattern with the naked eye. , and the magnetically recorded information can be read with a special instrument. [0003] Magnetic fluid ink printing belongs to the category of magnetic recording technology, and the production of magnetic recording media is completed through magnetic printing, so that it has the required special properties. At present, magnetic printing has been applied in many fields, such as train tickets, m...

Claims

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Application Information

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IPC IPC(8): C09D11/00
Inventor 邵慧萍郑航林涛赵子粉
Owner UNIV OF SCI & TECH BEIJING
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