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A kind of paper-based material surface coating agent, wrapping paper and preparation method

A coating agent, paper-based technology, applied in the directions of wrapping paper, wrapping paper, packaging, etc., can solve the problems of limited use of a single paper packaging material, poor moisture-proof and waterproof and mechanical properties, and poor water- and moisture-proof performance. Achieve the effect of improving anti-aging performance, good strength and high environmental protection

Active Publication Date: 2022-06-07
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, paper and cardboard are porous fibrous materials with low mechanical strength and a certain degree of permeability to moisture, oil, etc., so the scope of use of single paper packaging materials is limited
[0003] In order to meet the multi-functional and high-performance requirements of paper-based packaging materials, it is usually necessary to coat a layer of functional materials on the surface of the paper base. At present, the application and research of functional coating materials focus on the following two materials: one is synthetic polymer Coating materials, such as styrene-butadiene, acrylic, vinyl acetate and polyvinyl alcohol, for styrene-butadiene and acrylic, although they have better water and oil resistance and mechanical properties, However, it degrades slowly in nature. At present, it is mainly incinerated, which not only wastes energy but also pollutes the atmosphere; although vinyl acetates and polyvinyl alcohols are easy to degrade, they have poor water and moisture resistance. Chinese patent document CN109667192A discloses a A kind of thermal insulation wrapping paper and preparation method thereof, the coating layer of this wrapping paper comprises PVA coating layer, and PVA coating layer comprises polyvinyl alcohol, aerogel, glycerine and sodium bicarbonate, because polyvinyl alcohol has poor waterproof performance In this technology, a PVB coating layer is also set on the PVA coating layer, and the waterproof performance of the coating layer is improved through the PVB resin layer, but the coating layer is complex in composition and needs to be coated with two layers of materials; the other is natural high Molecular coating materials, such as starch, dextrin, chitin, cellulose, proteins, etc. Although these materials have good thermal processing performance and biodegradability, they have poor moisture-proof, waterproof and mechanical properties
To sum up, the current problems of functional coating agents used in paper-based packaging materials are mainly manifested in poor mechanical properties, single function, not easy to degrade, and poor environmental protection.

Method used

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  • A kind of paper-based material surface coating agent, wrapping paper and preparation method
  • A kind of paper-based material surface coating agent, wrapping paper and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The surface coating agent for paper-based materials described in this example is prepared from the following components: 5 g of guaiacol-based lignin, 2 g of hexamethylene diisocyanate, 0.1 g of dopamine hydrochloride, 0.15 g of zinc chloride, Dibutyltin dilaurate 0.1 g.

[0039] The preparation method of the paper-based material surface coating agent of the present embodiment is as follows:

[0040] S1. Mix guaiacol-based lignin and hexamethylene diisocyanate, dissolve in 100ml of N,N-dimethylformamide, then add dibutyltin dilaurate to the mixed solution to control the reaction The temperature is 65 °C, the stirring rate is 250 r / min, and the reaction is stopped after 16 h of reaction to obtain a lignin-based polyurethane prepolymer;

[0041] S2. adding dopamine hydrochloride to the product of step S1 and mixing, controlling the reaction temperature to be 55° C., and the stirring rate to be 200 r / min. After 4 hours of reaction, stop the reaction and make dopamine embe...

Embodiment 2

[0045] The surface coating agent for paper-based materials described in this example is prepared from the following ingredients: 4 g of syringyl-type lignin, 2.5 g of isophorone dihexacyanate, 0.2 g of dopamine hydrochloride, and 0.25 g of zinc chloride. g, stannous octoate 0.15g.

[0046] The preparation method of the paper-based material surface coating agent of the present embodiment is as follows:

[0047] S1. Mix syringyl-type lignin and isophorone dihexacyanate, dissolve in 100ml of N,N-dimethylformamide, then add stannous octoate to the mixed solution, and control the reaction temperature to be 70°C, the stirring rate is 300r / min, and the reaction is stopped after 14 hours of reaction to obtain a lignin-based polyurethane prepolymer;

[0048] S2. adding dopamine hydrochloride to the product of step S1 and mixing, controlling the reaction temperature to be 50° C., and the stirring rate to be 300 r / min, after 3 hours of reaction, stop the reaction, so that dopamine is em...

Embodiment 3

[0052] The surface coating agent for paper-based materials described in this example is prepared from the following ingredients: 6 g of p-hydroxyphenol-based lignin, 3 g of toluene diisocyanate, 0.3 g of dopamine hydrochloride, 0.3 g of zinc chloride, and 0.3 g of dibutyltin diacetate. 0.2g.

[0053] The preparation method of the paper-based material surface coating agent of the present embodiment is as follows:

[0054] S1. Mix p-hydroxyphenol-based lignin and toluene diisocyanate, dissolve in 100ml of N,N-dimethylformamide, then add dibutyltin diacetate to the mixed solution, control the reaction temperature to 75°C, and stir The rate is 200r / min, and after 10h of reaction, the reaction is stopped to obtain lignin-based polyurethane prepolymer;

[0055] S2. adding dopamine hydrochloride to the product of step S1 and mixing, controlling the reaction temperature to be 60° C., and the stirring rate to be 250 r / min, after 2.5 hours of reaction, stop the reaction, so that dopami...

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Abstract

The invention provides a paper-based material surface coating agent, packaging paper and a preparation method. Calculated according to the mass parts, the preparation raw materials of the paper-based material surface coating agent include: 1-200 parts of lignin, 1-100 parts of isocyanate, 0.1-10 parts of dopamine or its salt, 0.1-10 parts of zinc salt and 0.1-10 parts of catalyst. The preparation method of the paper-based material surface coating agent comprises the following steps: dissolving lignin, isocyanate, dopamine or its salt, zinc salt and a catalyst in a solvent and mixing them, and reacting, and then evaporating the solvent to obtain the paper-based material Surface coating agent. The paper base material surface coating agent of the present invention can significantly improve the strength, water resistance, oil resistance and antibacterial performance of the paper base packaging material, and the materials used are all biodegradable materials, and have strong environmental protection.

Description

technical field [0001] The invention belongs to the technical field of papermaking chemicals, and in particular relates to a surface coating agent for paper-based materials, wrapping paper and a preparation method. Background technique [0002] Under the dual pressure of resources and the environment, paper-based materials have become an important development direction of green packaging materials due to their recyclability, cost savings, and good processing and printing performance. However, paper and cardboard are porous fibrous materials with low mechanical strength and a certain degree of permeability to moisture, grease, etc., so the scope of application of single paper packaging materials is limited. [0003] In order to meet the multi-functional and high-performance requirements of paper-based packaging materials, it is usually necessary to coat a layer of functional materials on the surface of paper-based packaging. At present, the application and research of functio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H27/10D21H19/14D21H21/14D21H21/18D21H21/16B65D65/42C08G18/64C08G18/10C08G18/08
CPCD21H27/10D21H19/14D21H21/14D21H21/18D21H21/16B65D65/42C08G18/6492C08G18/10C08G18/0804C08G18/3281Y02W90/10
Inventor 吴芹
Owner QILU UNIV OF TECH