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Preparation method of dampproof and mildewproof corrugated paper

A corrugated paper and pulp technology, which is applied in paper, papermaking, paper coating, etc., can solve the problems of corrugated boxes such as moisture regain, mildew, loss of corrugated box performance, and reduced quality of preserved products, achieving improved hydrophobicity and stability, and excellent mechanical properties. Strength, good moisture-proof and mildew-proof effect

Inactive Publication Date: 2019-02-15
马鞍山市康辉纸箱纸品有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, corrugated paper packaging materials also have performance defects. Since corrugated paper is mainly made of plant fibers after beating, the adsorption capacity of cellulose can absorb moisture in the air and on the contact surface, especially under high temperature and humid storage conditions. It is easy to get damp and moldy, and the performance of corrugated boxes will be lost, resulting in a decline in the quality of preserved products and an increase in transportation costs
The current moisture-proof and mildew-proof cartons are generally sprayed with some waterproofing agents and antibacterial agents on the cartons. This type of moisture-proof and mildew-proof cartons cannot have a good moisture-proof and mildew-proof effect, and cannot achieve the purpose of moisture-proof and mildew-proof

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A method for preparing moisture-proof and mildew-proof corrugated paper, characterized in that the specific steps are as follows:

[0024] 1) Crush the waste paper and soak it in warm water until it becomes weak. After removing impurities and screening, a clean base paper slurry is obtained, and then mix the base paper slurry with 3% of its mass of mulberry fiber, 4% of apocynum fiber and 2% of its mass. After the hemp fiber is mixed and stirred evenly, the pulp is obtained for subsequent use;

[0025] 2) Heat the polyether diol to 120°C, reflux and dehydrate for 2 hours, then cool down to 50°C, add diisocyanate and catalyst triethylamine, slowly raise the temperature to 70°C, keep warm and stir for 3 hours at a speed of 150r / min to obtain Polyether polyurethane prepolymer, wherein the mass ratio of polyether diol, diisocyanate and triethylamine is 40:20:0.1;

[0026] 3) Mix the polyether polyurethane prepolymer with 2% of the chain extender 1,6-hexanediol and 1% of th...

Embodiment 2

[0038] A method for preparing moisture-proof and mildew-proof corrugated paper, characterized in that the specific steps are as follows:

[0039] 1) Crush the waste paper and soak it in warm water until it becomes weak, and get a clean base paper slurry after removing impurities and screening, and then mix the base paper slurry with 4% of its mass of mulberry fiber, 5% of apocynum fiber and 3% of its mass After the hemp fiber is mixed and stirred evenly, the pulp is obtained for subsequent use;

[0040] 2) Heat the polyether diol to 130°C, reflux and dehydrate for 1.5h, then cool down to 55°C, add diisocyanate and catalyst triethylamine, slowly heat up to 75°C, keep warm and stir at a speed of 170r / min for 2.5h , obtain polyether type polyurethane prepolymer, wherein the mass ratio of polyether glycol, diisocyanate and triethylamine is 50:30:0.2;

[0041] 3) Mix the polyether polyurethane prepolymer with 2.5% of the chain extender 1,6-hexanediol and 2% of the cross-linking ag...

Embodiment 3

[0053] A method for preparing moisture-proof and mildew-proof corrugated paper, characterized in that the specific steps are as follows:

[0054] 1) Crush the waste paper and soak it in warm water until it becomes weak. After removing impurities and screening, a clean base paper slurry is obtained. Then mix the base paper slurry with mulberry fiber equivalent to 5% of its mass, 7% apocynum fiber and 4% After the hemp fiber is mixed and stirred evenly, the pulp is obtained for subsequent use;

[0055] 2) Heat the polyether diol to 150°C, reflux for dehydration for 1 hour, then cool down to 60°C, add diisocyanate and catalyst triethylamine, slowly raise the temperature to 80°C, keep it warm and stir for 2 hours at a speed of 200r / min to obtain Polyether polyurethane prepolymer, wherein the mass ratio of polyether diol, diisocyanate and triethylamine is 70:40:0.3;

[0056] 3) Mix the polyether polyurethane prepolymer with 3% of the chain extender 1,6-hexanediol and 3% of the cro...

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Abstract

The invention discloses a preparation method of dampproof and mildewproof corrugated paper. The method comprises the following steps: pulping waste paper and mixing the pulped paper with fiber to prepare pulp; 2) preparing a polyether polyurethane prepolymer; 3) preparing polyether modified polyurethane; 4) kneading polyether modified polyurethane and polyethylene, and granulating a product by a twin-screw extruder to prepare polyether modified polyurethane / polyethylene blended grains; 5) processing the polyether modified polyurethane / polyethylene blended grains and nano-zinc oxide by the twin-screw extruder to prepare a polyether modified polyurethane complex; 6) smashing the polyether modified polyurethane complex, mixing the complex with the pulp, adding the mixture to a paper machine,injecting supercritical carbon dioxide, and performing drying and hot pressing to prepare semi-finished ground corrugated paper; 7) preparing emulsion; 8) spraying the emulsion to the surface of the ground corrugated paper and drying the ground corrugated paper to obtain the corrugated paper. The corrugated paper has dampproof and mildewproof effects, has long water penetration time and good quality and can protect packaged articles well.

Description

technical field [0001] The invention belongs to the technical field of wrapping paper processing, and in particular relates to a method for preparing moisture-proof and mildew-proof corrugated paper. Background technique [0002] Corrugated paper is a multi-layer bond formed by bonding face paper and inner corrugated corrugated paper. Corrugated boxes made of corrugated paper are indispensable packaging containers in production and life, and are widely used in transportation and packaging in various industries such as food, household appliances, textiles, food industry, and daily chemicals. However, corrugated paper packaging materials also have performance defects. Since corrugated paper is mainly made of plant fibers after beating, the adsorption capacity of cellulose can absorb moisture in the air and on the contact surface, especially under high temperature and humid storage conditions. Moisture and mildew are prone to occur, and the performance of corrugated boxes is l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H17/35D21H17/57D21H17/67D21H19/16D21H19/18D21H19/22D21H19/24D21H23/50C08B30/18C08G18/10C08G18/48C08G18/83D21F5/00D21F11/12
CPCC08B30/18C08G18/10C08G18/4825C08G18/837D21F5/00D21F11/12D21H17/35D21H17/57D21H17/675D21H19/16D21H19/18D21H19/22D21H19/24D21H23/50C08G18/3206Y02P20/54
Inventor 李昌斌
Owner 马鞍山市康辉纸箱纸品有限公司
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