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Aqueous magnetic slurry and preparation method thereof

A magnetic slurry and water-based technology, used in magnetic coatings, coatings, polyurea/polyurethane coatings, etc., can solve the problems affecting the apparent quality and coating performance of the coating, poor water resistance of the coating, and slow production speed. The effect of improving appearance, improving water resistance and reducing the amount of sanding

Inactive Publication Date: 2011-07-27
BAODING LUCKY INNOVATIVE MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The Chinese patent with the application number 200610012683.8 discloses a thermosensitive magnetic recording paper. The magnetic layer of this material uses water-based magnetic slurry, but because the water-based magnetic slurry contains more water-soluble adhesives, the coating has water resistance. Poor disadvantages; in addition, due to the poor fluidity of the slurry, it is necessary to sand all the components of the slurry, which causes the slurry to easily generate air bubbles, which affects the apparent quality and coating performance of the coating, and the production speed is slow ,high cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Barium ferrite 68.2 parts;

[0030] 5.8 parts of graphite;

[0031] 2.9 parts of polyacrylic acid sodium salt;

[0032] 2.0 parts of polyacrylic acid amine salt;

[0033] Polyvinyl alcohol mass concentration is 28.8 parts of aqueous solution of 10%;

[0034] Polyurethane emulsion (30% mass concentration) 59.0 parts;

[0035] 2.2 parts of polyisocyanate;

[0036] 54.6 parts of water;

[0037] 1. 68.2 parts of magnetic powder, 5.8 parts of carbon black, 2.9 parts of polyacrylic acid sodium salt, 2.0 parts of polyacrylic acid amine salt, 13.7 parts of polyvinyl alcohol with a mass concentration of 10% aqueous solution and 54.6 parts of water were mixed and stirred for 1 hour for pre-dispersion, and then Sand milling is performed to obtain a pre-dispersed slurry.

[0038] 2. Add 15.1 parts of an aqueous solution of polyvinyl alcohol with a mass concentration of 10% and 59.0 parts of a polyurethane emulsion (with a mass concentration of 30%) to the above predispersed s...

Embodiment 2

[0040] Barium ferrite 70.0 parts;

[0041] 1.0 parts of acetylene carbon black;

[0042] Tego dispersers 715W (Digao company) 1.5 parts;

[0043] Hydropalat 875 (Haichuan Company) 1.0 parts;

[0044] Polyvinyl alcohol mass concentration is 15.0 parts of aqueous solution of 10%;

[0045] Polyurethane emulsion (mass concentration is 30%) 65.0 parts;

[0046] 2 parts of aziridine;

[0047] 50.0 parts of water;

[0048] 1. Mix and stir 70.0 parts of magnetic powder, 1.0 parts of carbon black, 1.5 parts of Tego dispersers 715W, 1.0 parts of Hydropalat 875, 15.0 parts of an aqueous solution with a mass concentration of polyvinyl alcohol of 10% and 65.0 parts of water for 2.5 hours for pre-dispersion, and then sand Grind to obtain a pre-dispersed slurry.

[0049] 2. Add 65.0 parts of polyurethane emulsion (mass concentration: 30%) to the above pre-dispersed slurry, mix and stir evenly to obtain a water-type magnetic slurry. Before using the water-based magnetic slurry, add 2 p...

Embodiment 3

[0051] Barium ferrite 80.0 parts;

[0052] Fluorinated carbon black 3.0 parts;

[0053] Hydropalat 3275 (Haichuan Company) 1.5 parts;

[0054] Hydropalat 875 (Haichuan Company) 1.0 parts;

[0055] Polyvinyl alcohol mass concentration is 20.0 parts of aqueous solution of 10%;

[0056]Polyurethane emulsion (mass concentration is 30%) 60.0 parts;

[0057] Polyamide-3-chloro-1,2-propylene oxide (25%) 1 part;

[0058] 100 parts of water;

[0059] 1. Mix and stir 80.0 parts of magnetic powder, 3.0 parts of fluorinated carbon black, 1.5 parts of Hydropalat 3275, 1.0 parts of Hydropalat 3275, 15.0 parts of polyvinyl alcohol with a mass concentration of 10% aqueous solution and 100 parts of water for 2 hours for pre-dispersion, and then carry out Sand milling to obtain a pre-dispersed slurry.

[0060] 2. Add 5.0 parts of an aqueous solution of polyvinyl alcohol with a mass concentration of 10% and 60.0 parts of a polyurethane emulsion (with a mass concentration of 30%) to the abo...

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Abstract

The invention discloses aqueous magnetic slurry and a preparation method thereof. The magnetic slurry comprises the following component in part by weight: 50 to 80 parts of magnetic powder, 1 to 10 parts of carbon black, 1 to 10 parts of wetting and dispersing agent, 10 to 60 parts of binder, 0 to 10 parts of curing agent and 50 to 200 parts of water. The binder is a mixture of a water soluble binder and an emulsion binder, wherein the weight ratio of the water soluble binder to the emulsion binder is 1:5.5 to 1:20. The slurry has high flowability, improves the water resistance of the coating, reduces air bubbles and improves the spreading appearance of the coating. In the invention, due to the adoption of the two-step preparation method, the requirement of a formula system on the mechanical stability of the emulsion binder is lowered, the selection range of the binder is enlarged, the sanding amount of the slurry is reduced, the production efficiency of the slurry is improved, the air bubble content in the slurry is lowered, and the production cost is reduced.

Description

technical field [0001] The invention relates to an aqueous magnetic slurry and a preparation method thereof. Background technique [0002] Magnetic recording coatings are widely used in magnetic stripes, magnetic cards and magnetic coupons. At present, the adhesives used in the formulation of magnetic recording layers are generally oil-soluble polymers. A large amount of organic solvents are used, such as toluene, butanone, cyclohexanone, acetone, etc. These organic solvents are flammable, explosive, and toxic, and they volatilize in large quantities during production. The recycling cost is high, difficult to recycle, and easy to cause environmental pollution. In order to reduce environmental pollution and reduce production costs, it is very necessary to develop water-based magnetic recording layers. The Chinese patent with application number 200610012683.8 discloses a thermosensitive magnetic recording paper. The magnetic layer of this material uses water-based magnetic sl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/04C09D129/04C09D133/00C09D127/06C09D5/23
Inventor 刘亚军刘彦峰刘嘉秋
Owner BAODING LUCKY INNOVATIVE MATERIALS
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