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Method for improving dispersibility of nano ferrite in magnetic ink

A technology of nano-ferrite and magnetic ink, applied in the direction of ink, chemical instruments and methods, dyeing low-molecular organic compounds, etc., can solve the problems of poor compatibility, poor dispersion of nano-ferrite, easy agglomeration, etc., and achieve improvement Compatibility, promote uniform dispersion, overcome the effect of easy agglomeration

Inactive Publication Date: 2019-04-12
成都其其小数科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Therefore, when using nano-ferrite as a magnetic pigment to prepare magnetic ink, there are defects such as poor compatibility between ferrite and organic binder, poor dispersion of nano-ferrite, and easy agglomeration.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Add sodium hydroxide, ferric chloride, and ferrous chloride into the mixed solvent of glycerol and water, then add nano-ferrite, dispersant, ultrasonically disperse for 26 minutes, and then move it into a hydrothermal reaction kettle for reaction , filter and wash after the reaction, and vacuum-dry at 74°C for 11 hours to obtain hydroxyl-modified nano-ferrite; the parts by weight of each raw material are: 4 parts by weight of sodium hydroxide, 3 parts by weight of ferric chloride, chlorinated 2 parts by weight of ferrous iron, 45 parts by weight of glycerol, 24 parts by weight of water, 23 parts by weight of nano-ferrite, 1 part by weight of dispersant; nano-ferrite is spherical CoFeO 4 ; The dispersant is sodium hexametaphosphate; the temperature of the hydrothermal reaction is 156°C, and the time is 5h;

[0029] (2) Dissolve long-chain fatty acids in ethanol, add micron graphite flakes into deionized water and ultrasonically disperse for 14min, stir the graphite f...

Embodiment 2

[0034](1) Add sodium hydroxide, ferric chloride and ferrous chloride to the mixed solvent of glycerol and water, then add nano-ferrite and dispersant, ultrasonically disperse for 20~30min, and then move into the hydrothermal reaction kettle Carry out the reaction, filter and wash after the reaction, and vacuum-dry at 72°C for 11 hours to obtain a hydroxyl-modified nano-ferrite; the parts by weight of each raw material are: 3.5 parts by weight of sodium hydroxide, 2.5 parts by weight of ferric chloride, 2 parts by weight of ferrous chloride, 47 parts by weight of glycerol, 23 parts by weight of water, 21 parts by weight of nano-ferrite, and 1 part by weight of dispersant; the nano-ferrite is flake ZnFeO; the dispersant is sodium pyrophosphate; The temperature of the hydrothermal reaction is 153°C, and the time is 5.5h;

[0035] (2) Dissolve long-chain fatty acids in ethanol, add micron graphite flakes into deionized water and ultrasonically disperse for 12 minutes, stir the sus...

Embodiment 3

[0040] (1) Add sodium hydroxide, ferric chloride and ferrous chloride into the mixed solvent of glycerol and water, then add nano-ferrite and dispersant, ultrasonically disperse for 28 minutes, and then move into the hydrothermal reaction kettle for reaction , after the reaction is finished, filter, wash, and vacuum-dry at 78°C for 9 hours to obtain a hydroxyl-modified nano-ferrite; the parts by weight of each raw material are: 4.5 parts by weight of sodium hydroxide, 3.5 parts by weight of ferric chloride, 3.5 parts by weight of ferric chloride, 3 parts by weight of ferrous iron, 35 parts by weight of glycerin, 28 parts by weight of water, 24 parts by weight of nano-ferrite, 1-2 parts by weight of dispersant; nano-ferrite is needle-shaped MnFeO 4 ; The dispersant is sodium methylene bis-naphthalene sulfonate; the temperature of the hydrothermal reaction is 158°C, and the time is 4.5h;

[0041] (2) Dissolve long-chain fatty acids in ethanol, add micron graphite flakes into dei...

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PUM

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Abstract

The invention relates to the technical field of magnetic ink and provides a method for improving the dispersibility of nano ferrite in magnetic ink. The method comprises the following steps of performing hydroxylation modification on the nano ferrite through a hydrothermal reaction at first; then, performing fatty acid modification on a micron graphite sheet, loading the hydroxyl-modified nano ferrite on the surface of the fatty acid-modified micron graphite sheet by utilizing the reaction of hydroxyl and carboxyl under the action of a magnetic field, preparing a ferrite material loaded on thegraphite sheet, and using the obtained composite material as a magnetic pigment to be added into the ink. In this way, the purposes of improving the compatibility between the ferrite and an organic connecting material, improving the dispersibility of the nano ferrite and reducing agglomeration can be achieved.

Description

technical field [0001] The invention belongs to the technical field of magnetic ink and provides a method for improving the dispersibility of nanometer ferrite in magnetic ink. Background technique [0002] Magnetic ink is an ink made of magnetizable materials. It is mainly composed of pigments, binders, fillers and additives. The magnetizable materials mainly refer to magnetic pigments. Magnetic pigments can easily be magnetically aligned after magnetic field treatment, and obtain high residual magnetism. After adding to ink, the ink made shows magnetism and becomes magnetic ink. Magnetic pigments are widely used in the field of classification, retrieval, identification and anti-counterfeiting technology of bank notes and postal services. [0003] Among the currently commonly used magnetic pigments, ferrite is a metal oxide with ferrimagnetism. According to the magnetic properties, it can be divided into soft magnetic materials and hard magnetic materials. According to the...

Claims

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Application Information

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IPC IPC(8): C09C1/46C09C3/04C09C3/06C09C3/08C09D11/03
CPCC09C1/46C09C3/006C09C3/04C09C3/06C09C3/08C09D11/03
Inventor 蒋涛
Owner 成都其其小数科技有限公司
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