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A solution recycled high wet strength paper and its preparation method

A solution regeneration, paper technology, applied in the field of paper manufacturing, can solve the problems of loss of effect, wet strength and so on

Active Publication Date: 2021-09-14
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are mainly synthetic polymer reinforcing agents: polyethyleneimine, polyacrylic acid, polyacrylamide, aldehydated hemicellulose, etc., and natural polymer derivative reinforcing agents: hydroxypropyl methylcellulose, carboxymethyl fiber Starch, chitosan, anionic starch, cationic starch, etc. The water-solubility of these synthetic or natural derivative polymers makes their dry strength improve to a certain extent, but they lose their effect in the wet state, and the wet strength is weak. Currently, we are improving the wet strength There is relatively little research on the method

Method used

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  • A solution recycled high wet strength paper and its preparation method
  • A solution recycled high wet strength paper and its preparation method
  • A solution recycled high wet strength paper and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The preparation method of the solution recycled high-strength paper in this embodiment comprises the following steps:

[0037] 1. Mix purified shrimp skin α-chitin with 10% potassium hydroxide / 4% urea / 86% water, freeze at -30°C, and thaw at room temperature for three times to fully dissolve to obtain a mass concentration of 1-4% α-chitin alkaline solution;

[0038] 2. Brush the above-mentioned α-chitin solution on the surface of the paper with a thickness of 0.1-0.2mm to obtain surface-sized paper;

[0039] 3. Place the above-mentioned surface-sized paper in a 90% ethanol aqueous solution bath at 0°C, regenerate it for 2 hours, and wash it with running water until neutral; obtain the surface regenerated paper;

[0040] 4. Dry the surface recycled paper naturally to obtain finished high-strength paper. Cut out 10 sample strips of 300mm×15mm from the paper and measure them with a tensile tester. The tensile strength of the paper is N.m / g.

[0041]

Embodiment 2

[0043] The preparation method of the solution recycled high-strength paper in this embodiment comprises the following steps:

[0044] 1. Mix the purified squid bone β-chitin with 16% potassium hydroxide / 4% urea / 80% water, freeze at -35°C, thaw at room temperature, and dissolve fully in three cycles to obtain squid bone β with a mass concentration of 1-2% Chitin alkali solution;

[0045] 2. Brush the above-mentioned squid bone β-chitin solution on the surface of the paper, with a thickness of 0.15 mm, to obtain surface-sized paper;

[0046] 3. Put the above-mentioned surface-sized paper in a 90% ethanol aqueous solution bath at 0°C, regenerate it for 4 hours, and wash it with running water until neutral; obtain the surface regenerated paper;

[0047] 4. Dry the surface recycled paper naturally to obtain finished high-strength paper. Cut out 10 sample strips of 300mm×15mm from the paper and measure them with a tensile tester. The tensile strength of the paper is N.m / g.

[0048...

Embodiment 3

[0050] The preparation method of the solution recycled high-strength paper in this embodiment comprises the following steps:

[0051] 1. Mix chitosan (deacetylation degree 90%) with 7% lithium hydroxide / 8% potassium hydroxide / 8% urea / 77% water, freeze at -30°C, and thaw at room temperature for three times to fully dissolve to obtain quality 1-4% chitosan alkali solution;

[0052] 2. Brush the above-mentioned chitosan alkali solution on the paper surface with a thickness of 0.1mm to obtain surface sizing paper;

[0053] 3. Put the above-mentioned surface-sized paper in a 90% ethanol aqueous solution bath at -5°C, regenerate it for 6 hours, and wash it with running water until neutral; obtain the surface regenerated paper;

[0054] 4. Dry the surface recycled paper naturally to obtain finished high-strength paper. Cut out 10 sample strips of 300mm×15mm from the paper and measure them with a tensile tester. The tensile strength of the paper is N.m / g.

[0055]

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Abstract

The invention discloses a solution-regenerated high-wet-strength paper and a preparation method thereof. The solution-regenerated high-wet-strength paper is made by painting a non-water-soluble polymer solution on the surface of the paper, regenerating, and drying to obtain finished paper; The water-insoluble polymer is one or a mixture of α-chitin, β-chitin, and chitosan. The invention adopts the solution method to realize the strong combination of the added ingredients and the paper fiber at the molecular level, and the regeneration treatment makes the polymer solution become a nanofiber network that is no longer water-soluble, thereby greatly improving the wet strength of the paper and solving the problem of the previous paper reinforcement technology It can effectively improve the dry strength and wet strength of paper, and can also increase the hydrophobicity, gas barrier property and printability of paper. It can be used in food preservation packaging bags, transportation high-strength packaging boxes, calligraphy and painting lining paper etc.

Description

technical field [0001] The invention relates to the technical field of paper manufacture, in particular to a solution-regenerated high-wet-strength paper and a preparation method thereof. Background technique [0002] Paper is made of plant fibers and non-plant fibers (inorganic fibers, chemical fibers, metal fibers) as raw materials, processed into pulp, and then prepared by processes such as copying, drying, and pressing. Paper is often said to be plant-derived paper. Its chemical composition is mainly natural polymers-cellulose, hemicellulose, and lignin. The microscopic form is a network structure of plant fibers with diameters ranging from microns to millimeters. It is used for packaging. , writing, printing and other functions. As an environmentally friendly, renewable and degradable resource, paper is in line with the green products advocated by sustainable development. However, there are still some problems in the current paper. The dry strength needs to be further ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H19/10D21H17/06D21H17/07D21H17/24D21H17/65D21H17/67
CPCD21H17/06D21H17/07D21H17/24D21H17/65D21H17/675D21H19/10
Inventor 王慧庆王超君左盼盼钱浩张燕黄祖亮鲁传虎
Owner HEFEI UNIV OF TECH
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