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Heat-sensitive magnetic recording paper

A technology of recording paper and magnetic recording layer, which is applied in combined recording, data recording, temperature recording, etc., can solve the problems of large appearance influence, poor hot water resistance, shrinkage cavity, etc., to reduce manufacturing cost and improve water resistance , reduce the effect of air bubbles

Active Publication Date: 2006-10-11
BAODING LUCKY INNOVATIVE MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Japanese patent JP6-143811 discloses a thermosensitive magnetic recording material. The magnetic layer of the material uses water-based magnetic slurry, and the magnetic slurry uses polyvinyl alcohol as a binder. However, a large number of air bubbles will be generated during the pulping and use process, which will affect the dispersion. Efficiency and coating appearance, although the addition of silicone defoamers can effectively reduce air bubbles, but silicone defoamers affect the wetting of the magnetic slurry to the substrate during the coating process, which is likely to cause shrinkage and damage the surface. view has a great influence
Using polyvinyl alcohol adhesive alone, the coating has poor water resistance, especially poor water resistance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Embodiment 1, the preparation of magnetic recording layer slurry

[0049] Barium ferrite 50 parts

[0050] Acetylene carbon black 6 parts

[0051] Sodium dodecyl sulfonate 2 parts

[0052] 66.7 parts of polyvinyl alcohol 10% aqueous solution

[0053] Polyurethane emulsion (solid content 30%) 111 parts

[0054] 70 parts of water

[0055] The above components were mixed and pre-dispersed by planetary stirring for about 2 hours, and then subjected to constant temperature sand grinding in the range of 35°C to 45°C to make a magnetic recording layer slurry for later use.

[0056] Coat the magnetic recording layer on the paper base, the coating amount is 45g / m 2 , and then coat a heat-sensitive layer and a protective layer on the other side of the paper base, then dry and cut to obtain a heat-sensitive magnetic recording paper, and take samples to measure its performance (see table).

Embodiment 2

[0057] Preparation of Embodiment 2 Magnetic Recording Layer Slurry

[0058] Barium ferrite 90 parts

[0059] graphite 10 parts

[0060] Sodium dodecylbenzenesulfonate 5 parts

[0061] Polyvinyl alcohol 10% aqueous solution 265 parts

[0062] Polyurethane emulsion (30% dispersion) 44.5 parts

[0063] 60 parts of water

[0064] The above components are made into magnetic recording layer slurry for future use, and the process is the same as above.

[0065] Coat the magnetic recording layer on the paper base, the coating amount is 37g / m 2 , and the rest of the process is the same as above.

Embodiment 3

[0066] Embodiment 3 Preparation of Magnetic Recording Layer Slurry

[0067] Barium ferrite 80 parts

[0068] Fluorinated carbon black 5 parts

[0069] 1 part diethanolamide

[0070] 60 parts of polyvinyl alcohol 10% aqueous solution

[0071] Polyurethane emulsion (30% dispersion) 80 parts

[0072] 150 parts of water

[0073] The above components are made into magnetic recording layer slurry for future use, and the process is the same as above.

[0074] Coat the magnetic recording layer on the paper base, the coating amount is 40g / m 2 , and the rest of the process is the same as above.

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PUM

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Abstract

The invention relates to a thermal sensitive magnetic recording paper, which is used to reduce the magnetic slurry foam and improve the waterproof property of coat. Wherein, one surface of paper is coated with a magnetic recording layer, and another surface is coated with a thermal sensitive layer and a protective layer, while the components of magnetic recording layer (mass percentage) comprises: magnetic powder in 50-90 deals; carbon black in 5-10 deals; disperser in 1-5 deals; adhesive in 10-40 deals; and water in 50-200 deals; the adhesive is the mixture of soluble adhesive and emulsion adhesive. The invention has better waterproof ability, and the wider application for the tickets of railway, road, underground, etc.

Description

technical field [0001] The invention relates to a magnetic recording material, in particular to a thermosensitive magnetic recording paper. Background technique [0002] Magnetic recording paper is widely used as tickets in railways, highways, subways, parking lots, airports and other places. At present, magnetic recording paper generally includes three coatings, namely magnetic recording layer, heat-sensitive layer and protective layer. The magnetic The binder used in the formulation of the recording layer is generally an oil-soluble polymer, so a large amount of organic solvents, such as toluene, methyl ethyl ketone, cyclohexanone, acetone, etc., must be used when preparing the magnetic slurry. It is flammable, explosive, toxic and volatilizes in a large amount during production, it is difficult to recover, and it is easy to cause environmental pollution. In order to reduce environmental pollution and reduce production costs, it is very necessary to develop aqueous magnet...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B41M5/26G11B5/80G11B13/00
Inventor 董旭辉
Owner BAODING LUCKY INNOVATIVE MATERIALS
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