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Cross-linked water-based coating of thermo-sensitive paper, thermo-sensitive paper and preparation method of thermo-sensitive paper

A water-based coating and heat-sensitive paper technology, applied in the direction of copying/marking methods, coatings, paper coatings, etc., can solve the problems of non-yellowing and solvent-resistant protective effects, expensive cross-linked coatings, long curing time, etc., to achieve excellent Color stability, good anti-yellowing effect, and low production cost

Active Publication Date: 2022-05-13
GUANGDONG GUANHAO HIGH TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a cross-linked water-based coating of thermal paper, thermal paper and a preparation method thereof, in order to solve the problem that the cross-linked coating prepared by special thermal paper is expensive, has a long aging time, is not resistant to yellowing and is resistant to solvents. Technical problems with insufficient protection

Method used

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  • Cross-linked water-based coating of thermo-sensitive paper, thermo-sensitive paper and preparation method of thermo-sensitive paper
  • Cross-linked water-based coating of thermo-sensitive paper, thermo-sensitive paper and preparation method of thermo-sensitive paper

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A cross-linked water-based coating for heat-sensitive paper, including a heat-sensitive paint layer coated on the base paper surface, the total coating weight of the heat-sensitive paint layer is 6g / m 2 , and it includes the A liquid layer, the B liquid layer and the C liquid layer stacked in sequence from the base paper in the order of near and far, adjust the pH value of the A liquid layer raw material to (5.5±0.5), and the B liquid layer raw The raw materials of the C liquid layer are laminated and coated on the paper base material by the film transfer method / curtain coating method in sequence from near to far, and the production speed of the coating is (700±100)m / min. After calendering and drying Instantly.

[0024] Among them, the preparation raw materials of A liquid layer include 35g light calcium carbonate, 10g thermoplastic pigment, 40g modified corn starch, 10g polyvinyl alcohol, 10g water-soluble chitosan copolymer and 15g crosslinking agent A, water-soluble ...

Embodiment 2

[0028] A cross-linked water-based coating for heat-sensitive paper, including a heat-sensitive paint layer coated on the base paper surface, the total coating weight of the heat-sensitive paint layer is 15g / m 2 , and it includes the A liquid layer, the B liquid layer and the C liquid layer stacked in sequence from the base paper in the order of near and far, adjust the pH value of the A liquid layer raw material to (5.5±0.5), and the B liquid layer raw And C liquid layer raw materials are sequentially laminated and coated on the paper base material by air knife coating method / curtain coating method from near to far, and the production speed of coating is (500±100)m / min. It can be obtained after calendering and drying.

[0029] Among them, the preparation raw materials of A liquid layer include 35g light calcium carbonate, 10g thermoplastic pigment, 40g modified corn starch, 10g polyvinyl alcohol, 10g water-soluble chitosan copolymer and 15g crosslinking agent A, water-soluble ...

Embodiment 3

[0033] A cross-linked water-based coating for heat-sensitive paper, including a heat-sensitive paint layer coated on the base paper surface, the total coating weight of the heat-sensitive paint layer is 10g / m 2, and it includes the A liquid layer, the B liquid layer and the C liquid layer stacked in sequence from the base paper in the order of near and far, adjust the pH value of the A liquid layer raw material to (5.5±0.5), and the B liquid layer raw And C liquid layer raw materials are sequentially laminated from near to far and coated on the paper base material by casting method / curtain coating method. The production speed of coating is (600±100)m / min, calendering Ready to serve after drying.

[0034] Wherein, the preparation raw material of A liquid layer comprises 40g thermoplastic pigment, 20g modified cornstarch, 20g polyvinyl alcohol, 30g water-soluble chitosan copolymer and 10g crosslinking agent A, and water-soluble chitosan copolymer is specifically chitosan Sugar ...

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Abstract

The invention discloses a cross-linked water-based coating of thermo-sensitive paper, the thermo-sensitive paper and a preparation method of the thermo-sensitive paper, and relates to the field of special paper processing. The coating comprises a liquid layer A, a liquid layer B and a liquid layer C. The raw materials of the liquid layer A, the liquid layer B and the liquid layer C are sequentially combined through a film transfer method / curtain coating method, combined through an air knife coating method / curtain coating method or laminated and coated on a base paper material through a tape casting method / curtain coating method from near to far, and the coating is obtained after calendaring and drying. According to the application, the coatings among the layers are combined to generate a crosslinking effect, so that the thermo-sensitive paper is not permeated by hot melt glue or water glue on the back of the body paper and different solvents on the surface layer, the solvent resistance and the coating damage resistance are improved, the fastness and the strength of the thermo-sensitive paper are improved, the anti-yellowing effect is good, and the thermo-sensitive paper can be used for continuous printing and has a wide application prospect. The definition of the printed bar code content is ensured, and good printability is achieved.

Description

technical field [0001] The invention relates to the field of special paper processing, in particular to a cross-linked water-based coating of heat-sensitive paper, heat-sensitive paper and a preparation method thereof. Background technique [0002] There are many types of thermal paper on the market, including ordinary and special thermal paper. Ordinary thermal paper will become lighter or disappear after being placed for a long time in an environment of water, plasticizer or high temperature and high humidity, and the information is easily lost. The basic principle is that thermal paper The chromogenic agent, crystal violet lactone, is caused by a reverse reaction in high temperature and high humidity conditions. The special type thermal paper is to improve the waterproof, anti-friction, anti-solvent and other protective effects of ordinary thermal paper, and then coat the protective layer on the thermal chromogenic layer to endow the thermal paper with better waterproof ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H27/00D21H19/82D21H19/38D21H19/42D21H19/54D21H19/44D21H19/40D21H19/46D21H19/62D21H19/14D21H19/34D21H19/24D21H21/24D21H19/58B41M5/44B41M5/42
CPCD21H27/00D21H19/82D21H19/385D21H19/42D21H19/54D21H19/44D21H19/40D21H19/46D21H19/62D21H19/14D21H19/34D21H19/24D21H21/24D21H19/58B41M5/44B41M5/426Y02W90/10
Inventor 奎明红文辉程晓梁冬梅
Owner GUANGDONG GUANHAO HIGH TECH
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