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CN-122013590-A - Polymer waterproof antibacterial coating packing box corrugated paper and preparation method thereof

CN122013590ACN 122013590 ACN122013590 ACN 122013590ACN-122013590-A

Abstract

The invention discloses a high-molecular waterproof antibacterial coating packing box corrugated paper and a preparation method thereof, and belongs to the technical field of packaging material manufacturing. The corrugated paper forms a crosslinkable compact polymer film-forming layer on the surface of the paper base, is compounded with nano silver and organic biguanide antibacterial components, and reduces migration loss through multi-site synergistic bacteriostasis and fixation by a coating network, so that the ventilation and processing suitability of the paper base are maintained, and meanwhile, the water absorption penetration is obviously reduced, and the water resistance and antibacterial durability are improved. The method has simple process, is suitable for continuous coating and large-scale production of corrugated paper for packaging boxes, and can be used for packaging foods, cold chains and humid environments.

Inventors

  • YU LINJIAN

Assignees

  • 浙江巨鼎包装有限公司

Dates

Publication Date
20260512
Application Date
20260227

Claims (10)

  1. 1. The packaging box corrugated paper with the high-molecular waterproof antibacterial coating is characterized by comprising corrugated base paper serving as a base material and the high-molecular waterproof antibacterial coating coated on the surface of the corrugated base paper; The high polymer waterproof antibacterial coating is formed by solidifying coating liquid which comprises, by weight, 60-90 parts of aqueous polyurethane emulsion, 5-15 parts of waterproof reinforcing agent, 1-10 parts of composite antibacterial agent, 1-5 parts of cross-linking agent, 0.1-1.0 part of defoaming agent, 0.1-1.0 part of leveling agent and 10-30 parts of deionized water; The composite antibacterial agent is a composite of adamantane group-containing biguanide and chitosan-loaded nano silver, wherein the adamantane group-containing biguanide is 1,1' -nonane-2, 8-diylbis 5-3, 5-dimethyladamantan-1-yl biguanide; the structure of the 1,1' -nonane-2, 8-diylbis 5-3, 5-dimethyl adamantan-1-yl biguanide is as follows: 。
  2. 2. The corrugated paper of a high polymer waterproof and antibacterial coating packing case according to claim 1, wherein the solid content of the aqueous polyurethane emulsion is 30 to 50 percent, and the aqueous polyurethane emulsion is selected from cationic aqueous polyurethane emulsion or nonionic aqueous polyurethane emulsion.
  3. 3. The corrugated paper of the high polymer waterproof antibacterial coating packaging box according to claim 1, wherein the waterproof reinforcing agent is one or more selected from paraffin emulsion, methyltrimethoxysilane and perfluoroalkyl acrylate copolymer emulsion.
  4. 4. The corrugated paper of the high polymer waterproof and antibacterial coating packaging box according to claim 1, wherein the cross-linking agent is selected from one or more of trimethylolpropane-tris (3-aziridinyl propionate), pentaerythritol-tris (3-aziridinyl propionate), 3-glycidoxypropyl trimethoxysilane and 3-glycidoxypropyl methyl diethoxysilane.
  5. 5. The corrugated paper of the high polymer waterproof antibacterial coating packaging box according to claim 1, wherein the defoamer is one or more selected from the group consisting of Pick BYK-024 and Wake SD-860; the leveling agent is one or more selected from Pick BYK-333 and Ephragma EFKA-3580.
  6. 6. The corrugated paper of the high polymer waterproof antibacterial coating packaging box according to claim 1, wherein the molecular weight of chitosan in the composite antibacterial agent is 5-20 ten thousand daltons, the deacetylation degree of chitosan is more than or equal to 85 percent, and the particle size of nano silver is 10-50 nanometers.
  7. 7. A method for preparing the corrugated paper of the polymer waterproof antibacterial coating packing box according to any one of claims 1 to 6, which comprises the following steps: Firstly, preparing a chitosan-loaded nano silver compound, dissolving chitosan in an acetic acid aqueous solution, adding a silver nitrate aqueous solution, adding a reducing agent for reaction after the dripping is finished, and centrifugally washing and freeze-drying a product after the reaction is finished; Preparing an organic antibacterial agent solution, and dissolving 1,1' -nonane-2, 8-diylbis 5-3, 5-dimethyl adamantan-1-yl biguanide in an organic solvent; thirdly, preparing a composite antibacterial agent, dispersing the chitosan loaded nano silver compound prepared in the first step into deionized water, adding the organic antibacterial agent solution prepared in the second step under stirring, reacting and drying to obtain the composite antibacterial agent; fourthly, preparing coating liquid, weighing aqueous polyurethane emulsion and deionized water according to parts by weight, mixing, adding the composite antibacterial agent prepared in the third step for dispersion, and then sequentially adding a waterproof reinforcing agent, a cross-linking agent, a defoaming agent and a leveling agent for uniform mixing; and fifthly, coating and curing, namely coating the coating liquid prepared in the fourth step on the surface of the corrugated base paper, and sending the corrugated base paper into a drying tunnel for drying and curing.
  8. 8. The method for preparing corrugated paper of a high molecular waterproof and antibacterial coating packaging box according to claim 7, wherein in the first step, the volume concentration of an acetic acid aqueous solution is one percent to two percent, the mass fraction of a chitosan solution is two percent to five percent, the concentration of a silver nitrate aqueous solution is 0.01 mol/L to 0.05 mol/L, the mass ratio of chitosan to silver nitrate is 5 to 1 to 10 to 1, the reducing agent is sodium borohydride or sodium citrate, the reaction temperature is 40 ℃ to 60 ℃, and the reaction time is 1 hour to 3 hours; in the second step, the mass fraction of the organic antimicrobial solution is five to fifteen percent, and the organic solvent is selected from ethanol, isopropanol, N-dimethylformamide or a mixture thereof.
  9. 9. The method for preparing corrugated paper of a packaging box with a high polymer waterproof antibacterial coating according to claim 7, wherein in the third step, the mass fraction of the dispersion liquid of the chitosan-loaded nano silver compound is five to two percent, the mass ratio of the organic antibacterial agent to the chitosan-loaded nano silver compound is1 to 5 to 1, and the drying mode is spray drying or vacuum drying.
  10. 10. The method for preparing corrugated paper of a packaging box with a waterproof and antibacterial polymer coating according to claim 7, wherein in the fourth step, the composite antibacterial agent is added and then subjected to high-shear grinding and dispersing until the particle size of the powder in the system is less than 50 microns, and the uniformly mixed coating liquid is filtered by a 200-mesh filter screen; in the fifth step, the coating mode is roller coating, spraying or curtain coating, and the drying and curing temperature is 80-120 ℃.

Description

Polymer waterproof antibacterial coating packing box corrugated paper and preparation method thereof Technical Field The invention belongs to the technical field of packaging material manufacturing, and particularly relates to a high-molecular waterproof antibacterial coating packaging box corrugated paper and a preparation method thereof. Background Corrugated paper is widely applied to the fields of logistics transportation, food, precise instrument packaging and the like by virtue of light weight, low cost and excellent buffering performance. However, the corrugated paper is mainly composed of plant fibers, has a porous structure and strong hydrophilicity, is extremely easy to absorb moisture and regain moisture in a humid environment, can greatly reduce the strength of the paper box and collapse and deform, and the humid environment rich in cellulose provides a warm bed for breeding microorganisms such as bacteria and mold. The proliferation of microorganisms can attack the packaging material, produce off-flavors and stains, and even contaminate the contents of the package, especially in the transportation of food cold chains and medical supplies, with significant health and safety risks. In order to overcome the above-mentioned drawbacks, the prior art generally adopts a method of coating a polymer coating on the surface of corrugated base paper for modification treatment, for example, using an aqueous polyurethane emulsion as a matrix resin, and adding an antibacterial agent to impart antibacterial function to the packaging box. Common antibacterial agents include inorganic nano silver, nano zinc oxide, or organic quaternary ammonium salts, biguanide compounds, and the like. However, the existing high-molecular waterproof antibacterial coating technology still has obvious limitations. Firstly, although the inorganic nano antibacterial agent has good heat resistance, the inorganic nano antibacterial agent has high surface energy, is extremely easy to agglomerate in the aqueous resin matrix, causes uneven dispersion in the coating, and is difficult to fully exert the small-size effect, thereby reducing the antibacterial efficiency and affecting the compactness of the coating. Secondly, the conventional water-soluble organic antibacterial agent (such as common biguanides) has strong hydrophilicity and weak bonding force with a hydrophobic polymer matrix, and the antibacterial agent is easy to migrate from the inside of the coating to the surface and dissolve and run off when the antibacterial agent is in a long-term high-humidity environment or contacted with water. Not only does this precipitation lead to rapid decay of the antimicrobial effect over time, lacking in long-term effectiveness, but the microporous channels formed by the lost antimicrobial agent can in turn destroy the water-repellent integrity of the coating. Therefore, developing a polymer waterproof antibacterial coating packaging box corrugated paper which can effectively solve the problems of poor dispersibility, easy agglomeration and precipitation loss of the antibacterial agent caused by insufficient water resistance is a technical problem to be solved in the current field. Disclosure of Invention Aiming at the problems that inorganic antibacterial agents are easy to agglomerate, organic antibacterial agents are poor in water resistance and easy to separate out and run off in the conventional corrugated paper antibacterial coating, so that antibacterial failure and waterproof property are damaged, the invention provides the corrugated paper with the high-polymer waterproof antibacterial coating for the packaging box and a preparation method of the corrugated paper. The invention aims to realize uniform dispersion and stable combination of antibacterial components in a coating by introducing a specific organic-inorganic hybrid composite antibacterial agent and utilizing a hydrophobic anchoring and carrier dispersing mechanism, thereby endowing corrugated paper with excellent physical waterproof performance and long-acting broad-spectrum antibacterial performance. In order to achieve the above purpose, the invention adopts the following technical scheme: The packaging box corrugated paper with the waterproof and antibacterial polymer coating comprises corrugated base paper serving as a base material and the waterproof and antibacterial polymer coating coated on the surface of the corrugated base paper; The high polymer waterproof antibacterial coating is formed by solidifying coating liquid which comprises, by weight, 60-90 parts of aqueous polyurethane emulsion, 5-15 parts of waterproof reinforcing agent, 1-10 parts of composite antibacterial agent, 1-5 parts of cross-linking agent, 0.1-1.0 part of defoaming agent, 0.1-1.0 part of leveling agent and 10-30 parts of deionized water; further, the composite antibacterial agent is a composite of adamantane group-containing biguanide and chitosan-loaded nano silver, wherein the adamantane g