CN107839326B - Mildew-proof fresh-keeping corrugated board and preparation method thereof - Google Patents
Mildew-proof fresh-keeping corrugated board and preparation method thereof Download PDFInfo
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- CN107839326B CN107839326B CN201711047144.2A CN201711047144A CN107839326B CN 107839326 B CN107839326 B CN 107839326B CN 201711047144 A CN201711047144 A CN 201711047144A CN 107839326 B CN107839326 B CN 107839326B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B29/00—Layered products comprising a layer of paper or cardboard
- B32B29/002—Layered products comprising a layer of paper or cardboard as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B29/005—Layered products comprising a layer of paper or cardboard as the main or only constituent of a layer, which is next to another layer of the same or of a different material next to another layer of paper or cardboard layer
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- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23B—PRESERVING, e.g. BY CANNING, MEAT, FISH, EGGS, FRUIT, VEGETABLES, EDIBLE SEEDS; CHEMICAL RIPENING OF FRUIT OR VEGETABLES; THE PRESERVED, RIPENED, OR CANNED PRODUCTS
- A23B7/00—Preservation or chemical ripening of fruit or vegetables
- A23B7/14—Preserving or ripening with chemicals not covered by groups A23B7/08 or A23B7/10
- A23B7/144—Preserving or ripening with chemicals not covered by groups A23B7/08 or A23B7/10 in the form of gases, e.g. fumigation; Compositions or apparatus therefor
- A23B7/152—Preserving or ripening with chemicals not covered by groups A23B7/08 or A23B7/10 in the form of gases, e.g. fumigation; Compositions or apparatus therefor in a controlled atmosphere comprising other gases in addition to CO2, N2, O2 or H2O ; Elimination of such other gases
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B29/00—Layered products comprising a layer of paper or cardboard
- B32B29/08—Corrugated paper or cardboard
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2250/00—Layers arrangement
- B32B2250/26—All layers being made of paper or paperboard
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2255/00—Coating on the layer surface
- B32B2255/12—Coating on the layer surface on paper layer
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Abstract
The invention relates to a mildew-proof fresh-keeping corrugated board and a preparation method thereof, wherein the mildew-proof fresh-keeping corrugated board comprises corrugated liner paper, corrugated core paper and corrugated surface paper which are sequentially stacked, wherein a mildew-proof coating is arranged on one surface, close to the corrugated liner paper, of the corrugated core paper, a fresh-keeping coating is arranged on one surface, close to the corrugated surface paper, of the corrugated core paper, the fresh-keeping coating is composed of hollow porous polymer microspheres loaded with an adsorbent, the adsorbent comprises potassium permanganate, and at least part of the adsorbent is loaded in the hollow porous polymer microspheres. The mildew-proof coating of the mildew-proof fresh-keeping corrugated board can inhibit the growth of mildew in a package, the mildew is not easy to generate under the condition that fruits and vegetables are not subjected to pretreatment, ethylene can be removed more efficiently by the fresh-keeping coating, and the respiration of the fruits and vegetables is not influenced, so that the preservation effect is improved, and the preservation duration is prolonged.
Description
Technical Field
The invention relates to the technical field of mildew prevention and preservation, in particular to a mildew prevention and preservation corrugated board and a preparation method thereof.
Background
Fresh fruits and vegetables are important sources of daily necessary vitamins, minerals and dietary fibers, and have unique shape, color, aroma and taste. The fruit and vegetable tissues have high water content and are tender, but the tissues are easy to rot and deteriorate, are not durable to store, and are easy to lose freshness after being picked, so that the quality is reduced, and even the commodity value and the nutritional value are lost. The demand of fruits and vegetables is second to the agricultural products of grains in the world, and through years of development, China becomes the largest fruit and vegetable product producing country in the world, has rich germplasm resources and long cultivation history, and is a provenance place of various fruits and vegetables in the world. The storage and preservation of the picked fruits and vegetables are the continuation of agricultural production, the quality and the freshness of the fruits and vegetables are one of important targets pursued by people, and the problems need to be solved in the processes of storage, transportation and circulation of the fruits and vegetables.
In the fields of food packaging in family life, supermarket stores, hotels and restaurants and industrial production, corrugated boards are widely used for packaging and transporting food, and the corrugated boards have a good physical buffer protection effect. However, the common corrugated board has poor preservation effect on fruits and vegetables and short preservation time.
Disclosure of Invention
Therefore, the mildew-proof fresh-keeping corrugated board which has a good preservation effect on fruits and vegetables and is long in preservation time is needed.
The utility model provides a mould proof fresh-keeping corrugated container board, is including the flute back paper, flute core paper and the flute facial tissue that stack gradually, the flute core paper is close to the one side of flute back paper is equipped with mould proof coating, the flute core paper is close to the one side of flute facial tissue is equipped with fresh-keeping coating, fresh-keeping coating comprises the hollow porous polymer microballon that carries the adsorbent, the adsorbent includes potassium permanganate, the adsorbent at least part load in the inside of hollow porous polymer microballon.
In one embodiment, the adsorbent further comprises montmorillonite, activated carbon, chromium oxide and methylcyclopropene.
In one embodiment, the mass percentages of the potassium permanganate, the methylcyclopropene, the chromic oxide, the activated carbon and the montmorillonite in the adsorbent are 55-65%, 20-30%, 5-10%, 1-3% and 1-3%, respectively.
In one embodiment, the corrugated surface paper is provided with a decorative layer on the surface far away from the corrugated medium paper.
In one embodiment, the mildew-proof coating comprises the following components in percentage by mass: 70-90% of water-absorbing resin and 10-30% of mildew preventive.
In one embodiment, the water absorbent resin is selected from one or more of polyurethane, acrylate copolymer, polyvinyl alcohol, ethylene-vinyl acetate copolymer, polyvinyl acetate copolymer, epoxy resin, polyester and derivatives thereof.
In one embodiment, the water absorbent resin comprises the following components in percentage by mass: 10-15% of polyvinyl alcohol and 85-90% of acrylate copolymer.
In one embodiment, the acrylic copolymer is selected from one or more of methyl methacrylate-ethyl acrylate-butyl acrylate copolymer, methyl methacrylate-butyl acrylate-acrylic acid copolymer, and methyl methacrylate-butyl acrylate-acrylic acid-N-methylol acrylamide copolymer.
In one embodiment, the polyvinyl alcohol is selected from one or more of polyvinyl alcohol 1788, polyvinyl alcohol 2088, and polyvinyl alcohol 2488.
The invention also provides a preparation method of the mildew-proof fresh-keeping corrugated board, which comprises the following steps:
forming the mildew-proof coating on one side of the corrugated medium paper;
coating an ethanol solution of hollow porous polymer microspheres on one surface of the corrugated medium paper, which is far away from the mildew-proof coating, coating a slurry obtained by mixing the adsorbent and water on one surface of the corrugated medium paper, which is far away from the mildew-proof coating, and drying to form the fresh-keeping coating;
and sequentially laminating and fixing the corrugated liner paper, the corrugated core paper with the mildew-proof coating and the fresh-keeping coating and the corrugated surface paper to obtain the mildew-proof fresh-keeping corrugated board.
Ethylene is a plant hormone, and can be slowly accumulated and released in the development of fruit and vegetable horticultural plants, and when the released ethylene reaches a certain amount around the fruits and vegetables, the ripening and the decay of the fruits and vegetables can be accelerated, and the commodity value of the fruits and vegetables is reduced. In the storage environment of fruits and vegetables, ethylene can also change the action of carbon dioxide on the fruits and vegetables to cause metabolic disorder of the fruits and vegetables. Therefore, the traditional corrugated board cannot effectively reduce the ethylene concentration around the fruits and vegetables, so that the ethylene concentration is gradually increased, the rotting speed of the fruits and vegetables is increased, the fresh-keeping effect is influenced, and the fresh-keeping time is shortened. When the mildew-proof fresh-keeping corrugated board provided by the invention is used for packaging fruits and vegetables, the corrugated core paper can provide a physical buffer protection effect, the mildew-proof coating on the surface of the corrugated core paper can inhibit the growth of mildew in the package, the fruits and vegetables are not easy to mildew under the condition that the fruits and vegetables are not pretreated, and ethylene generated by respiration of the fruits and vegetables can be removed by potassium permanganate in the fresh-keeping coating on the surface of the corrugated core paper. And because the potassium permanganate is accommodated in the hollow porous polymer microspheres, the specific surface area is higher, when the ethylene contacts the fresh-keeping coating, the potassium permanganate can fully react with the potassium permanganate by passing through a large number of microspheres, the reaction efficiency and the raw material utilization rate are improved, and the ethylene can be removed more efficiently, so that the ethylene concentration is maintained at a very low level, and the respiration of fruits and vegetables is not influenced, thereby improving the preservation effect and prolonging the preservation time.
Secondly, methylcyclopropene, chromic oxide, activated carbon and montmorillonite are added into the adsorbent, and the fresh-keeping effect is further improved by optimizing the proportion of each component. Methyl cyclopropene can compete with ethylene for ethylene receptor to inhibit the synthesis and physiological action of ethylene, chromium sesquioxide is added to promote the oxidative decomposition of ethylene, activated carbon has excellent physical adsorption performance, montmorillonite has unique one-dimensional layered nano structure, and is a soil-like mineral formed by stacking nano-thickness silicate sheets with negative surface charges and relying on the electrostatic action between layers, and a unit cell in the crystal structure is formed by sandwiching a layer of aluminum oxygen octahedron between two layers of silicon oxygen tetrahedron, and has strong adsorption capacity and good dispersion performance. The components are cooperated and matched under a specific proportion, so that the concentration of ethylene can be further kept at a lower level, and the preservation time is prolonged.
Furthermore, the specific combination of the polyhydroxy polymers optimized by the mildew-proof coating has strong water absorption, can adsorb water vapor after contacting with the polyhydroxy polymers, and can be reversely diffused into a package after reaching a certain concentration due to the concentration difference, so that the water loss of fruits and vegetables can be effectively inhibited, and the preservation quality of the fruits and vegetables is improved.
Detailed Description
The present invention will be described in detail with reference to the following embodiments in order to make the objects, features and advantages thereof more comprehensible. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in many ways different from those described herein, and it will be apparent to those skilled in the art that similar modifications may be made without departing from the spirit of the invention, and the invention is therefore not limited to the specific embodiments disclosed below.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The mildew-proof fresh-keeping corrugated board comprises corrugated liner paper, corrugated medium paper and corrugated surface paper which are sequentially stacked, wherein a mildew-proof coating is arranged on one surface, close to the corrugated liner paper, of the corrugated medium paper, a fresh-keeping coating is arranged on one surface, close to the corrugated surface paper, of the corrugated medium paper, the fresh-keeping coating is composed of hollow porous polymer microspheres loaded with an adsorbent, the adsorbent comprises potassium permanganate, and at least part of the adsorbent is loaded in the hollow porous polymer microspheres.
Furthermore, the adsorbent also comprises montmorillonite, activated carbon, chromic oxide and methylcyclopropene.
Specifically, the mass percentages of the potassium permanganate, the methylcyclopropene, the chromium oxide, the activated carbon and the montmorillonite in the adsorbent are respectively 55-65%, 20-30%, 5-10%, 1-3% and 1-3%.
Optionally, the side of the corrugated surface paper away from the corrugated medium paper is provided with a decorative layer, such as characters, patterns and other information, for identification.
In one embodiment, the mildewproof coating comprises the following components in percentage by mass: 70-90% of water-absorbent resin and 10-30% of mildew preventive. Specifically, the water-absorbent resin is selected from one or more of polyurethane, acrylate copolymer, polyvinyl alcohol, ethylene-vinyl acetate copolymer, polyvinyl acetate copolymer, epoxy resin, polyester and derivatives thereof. Preferably, the water absorbent resin comprises the following components in percentage by mass: 10-15% of polyvinyl alcohol and 85-90% of acrylate copolymer.
Further, the acrylic ester copolymer is selected from one or more of methyl methacrylate-ethyl acrylate-butyl acrylate copolymer, methyl methacrylate-butyl acrylate-acrylic acid copolymer and methyl methacrylate-butyl acrylate-acrylic acid-N-hydroxymethyl acrylamide copolymer. Optionally, the polyvinyl alcohol is selected from one or more of polyvinyl alcohol 1788, polyvinyl alcohol 2088, and polyvinyl alcohol 2488. Preferably, the water absorbent resin comprises the following components in percentage by mass: 5-8% of polyvinyl alcohol 1788, 5-7% of polyvinyl alcohol 2488 and 85-90% of methyl methacrylate-butyl acrylate-acrylic acid copolymer, has better water retention effect, and has better overall performance when matched with mildew preventive, fresh-keeping coating and the like.
In one embodiment, the mildewcide is selected from one or more of sodium diacetate, potassium sorbate, sodium sorbate, potassium citrate, sodium citrate, calcium propionate, sodium ascorbate, potassium ascorbate, sodium salicylate, salicylamide, dodecylalanine, sodium isoascorbate, carbazone, parabens, and lysozyme. Preferably, the mildew preventive comprises the following components in percentage by mass: 22 to 26 percent of sodium ascorbate, 22 to 26 percent of trichlamide and 48 to 56 percent of kasong, and has better mildew-proof effect.
In one embodiment, the thickness of the mildew-proof coating is 2-5 μm, and the thickness of the freshness-retaining coating is 2-5 μm. Preferably, the pore size of the hollow porous polymeric microspheres is greater than 50 nm. Optionally, the hollow porous polymer microspheres are made of an acrylate copolymer.
The preparation method of the mildew-proof fresh-keeping corrugated board comprises the following steps of S1-S3:
and S1, forming a mildew-proof coating on one surface of the corrugated medium paper.
Specifically, the raw materials of the components are weighed according to the proportion and mixed with water for pulping to obtain the mildewproof coating, and then the mildewproof coating is coated on one surface of the corrugated medium paper to be dried to form the mildewproof coating.
S2, coating ethanol solution of hollow porous polymer microspheres on one surface of the corrugated medium paper far away from the mildew-proof coating, coating slurry obtained by mixing an adsorbent and water on one surface of the corrugated medium paper far away from the mildew-proof coating, and drying to form the fresh-keeping coating.
Thus, the freshness-retaining coating is composed of hollow porous polymer microspheres loaded with the adsorbent, and the adsorbent is at least partially loaded in the hollow porous polymer microspheres.
Preferably, the mass percent concentration of the adsorbent in the slurry is 0.2% to 1%, too high a concentration easily causes difficulty in sufficiently entering the hollow porous polymer microspheres, and too low a concentration reduces the adsorption effect.
And S3, sequentially laminating and fixing the corrugated liner paper, the corrugated medium paper with the mildew-proof coating and the fresh-keeping coating and the corrugated surface paper to obtain the mildew-proof fresh-keeping corrugated board.
In one embodiment, the drying specifically includes the following steps: drying for 5-6 hours at 15-25 ℃, and then drying for 1-3 hours at 50-80 ℃. So, put into the environment of 20 ℃ or so earlier and slowly dry, along with the evaporation of the moisture in the microballon, the water outside the microballon can carry partial adsorbent once more and get into the microballon, then dry the moisture in the microballon fast fully under higher temperature again, avoid directly dry under high temperature lead to moisture too fast evaporation and more adsorbents still stay on the surface of microballon.
Ethylene is a plant hormone, and can be slowly accumulated and released in the development of fruit and vegetable horticultural plants, and when the released ethylene reaches a certain amount around the fruits and vegetables, the ripening and the decay of the fruits and vegetables can be accelerated, and the commodity value of the fruits and vegetables is reduced. In the storage environment of fruits and vegetables, ethylene can also change the action of carbon dioxide on the fruits and vegetables to cause metabolic disorder of the fruits and vegetables. Therefore, the traditional corrugated board cannot effectively reduce the ethylene concentration around the fruits and vegetables, so that the ethylene concentration is gradually increased, the rotting speed of the fruits and vegetables is increased, the fresh-keeping effect is influenced, and the fresh-keeping time is shortened. When the mildew-proof fresh-keeping corrugated board provided by the invention is used for packaging fruits and vegetables, the corrugated core paper can provide a physical buffer protection effect, the mildew-proof coating on the surface of the corrugated core paper can inhibit the growth of mildew in the package, the fruits and vegetables are not easy to mildew under the condition that the fruits and vegetables are not pretreated, and ethylene generated by respiration of the fruits and vegetables can be removed by potassium permanganate in the fresh-keeping coating on the surface of the corrugated core paper. And because the potassium permanganate is accommodated in the hollow porous polymer microspheres, the specific surface area is higher, when the ethylene contacts the fresh-keeping coating, the potassium permanganate can fully react with the potassium permanganate by passing through a large number of microspheres, the reaction efficiency and the raw material utilization rate are improved, and the ethylene can be removed more efficiently, so that the ethylene concentration is maintained at a very low level, and the respiration of fruits and vegetables is not influenced, thereby improving the preservation effect and prolonging the preservation time.
Secondly, methylcyclopropene, chromic oxide, activated carbon and montmorillonite are added into the adsorbent, and the fresh-keeping effect is further improved by optimizing the proportion of each component. Methyl cyclopropene can compete with ethylene for ethylene receptor to inhibit the synthesis and physiological action of ethylene, chromium sesquioxide is added to promote the oxidative decomposition of ethylene, activated carbon has excellent physical adsorption performance, montmorillonite has unique one-dimensional layered nano structure, and is a soil-like mineral formed by stacking nano-thickness silicate sheets with negative surface charges and relying on the electrostatic action between layers, and a unit cell in the crystal structure is formed by sandwiching a layer of aluminum oxygen octahedron between two layers of silicon oxygen tetrahedron, and has strong adsorption capacity and good dispersion performance. The components are cooperated and matched under a specific proportion, so that the concentration of ethylene can be further kept at a lower level, and the preservation time is prolonged.
Furthermore, the specific combination of the polyhydroxy polymers optimized by the mildew-proof coating has strong water absorption, can adsorb water vapor after contacting with the polyhydroxy polymers, and can be reversely diffused into a package after reaching a certain concentration due to the concentration difference, so that the water loss of fruits and vegetables can be effectively inhibited, and the preservation quality of the fruits and vegetables is improved.
The following are specific examples.
Example 1
A mildew-proof coating is coated on one side of corrugated medium paper to form a mildew-proof coating, wherein the mildew-proof coating comprises 78% of water-absorbent resin and 22% of mildew-proof agent, the water-absorbent resin consists of 7% of polyvinyl alcohol 1788, 6% of polyvinyl alcohol 2488 and 87% of methyl methacrylate-butyl acrylate-acrylic acid copolymer, and the mildew-proof agent consists of 25% of sodium ascorbate, 25% of salicylamide and 50% of karson.
And (3) coating an ethanol solution of hollow porous polymer microspheres on the surface, far away from the mildew-proof coating, of the corrugated medium paper, wherein the hollow porous polymer microspheres are made of an acrylate copolymer. Weighing the following components in percentage by mass to obtain the adsorbent: 62 percent of potassium permanganate, 27 percent of methylcyclopropene, 8 percent of chromic oxide, 2 percent of active carbon and 1 percent of montmorillonite. And mixing an adsorbent with water to obtain slurry, wherein the mass percentage concentration of the adsorbent is 0.5%, coating the slurry on one surface of the corrugated medium paper, which is far away from the mildew-proof coating, slowly drying the corrugated medium paper in an environment at 20 ℃ for 5 hours, and drying the corrugated medium paper in an oven at 60 ℃ for 2 hours to form the fresh-keeping coating. And finally, sequentially laminating and fixing the corrugated liner paper, the corrugated medium paper and the corrugated surface paper to obtain the mildew-proof fresh-keeping corrugated board, wherein the thickness of the mildew-proof coating is 3 micrometers, and the thickness of the fresh-keeping coating is 3 micrometers.
Example 2
A mildew-proof coating is coated on one side of corrugated medium paper to form a mildew-proof coating, wherein the mildew-proof coating comprises 78% of water-absorbent resin and 22% of mildew-proof agent, the water-absorbent resin consists of 7% of polyvinyl alcohol 1788, 6% of polyvinyl alcohol 2488 and 87% of methyl methacrylate-butyl acrylate-acrylic acid copolymer, and the mildew-proof agent consists of 25% of sodium ascorbate, 25% of salicylamide and 50% of karson.
And (3) coating an ethanol solution of hollow porous polymer microspheres on the surface, far away from the mildew-proof coating, of the corrugated medium paper, wherein the hollow porous polymer microspheres are made of an acrylate copolymer. Mixing potassium permanganate with water to obtain slurry, wherein the mass percentage concentration of the potassium permanganate is 0.5%, coating the slurry on one surface of the corrugated medium paper, which is far away from the mildew-proof coating, slowly drying the corrugated medium paper in an environment at 20 ℃ for 5 hours, and drying the corrugated medium paper in an oven at 60 ℃ for 2 hours to form the fresh-keeping coating. And finally, sequentially laminating and fixing the corrugated liner paper, the corrugated medium paper and the corrugated surface paper to obtain the mildew-proof fresh-keeping corrugated board, wherein the thickness of the mildew-proof coating is 3 micrometers, and the thickness of the fresh-keeping coating is 3 micrometers.
Example 3
A mildew-proof coating is coated on one side of corrugated medium paper to form a mildew-proof coating, wherein the mildew-proof coating comprises 78% of water-absorbent resin and 22% of mildew-proof agent, the water-absorbent resin consists of 7% of polyvinyl alcohol 1788, 6% of polyvinyl alcohol 2488 and 87% of methyl methacrylate-butyl acrylate-acrylic acid copolymer, and the mildew-proof agent consists of 25% of sodium ascorbate, 25% of salicylamide and 50% of karson.
And (3) coating an ethanol solution of hollow porous polymer microspheres on the surface, far away from the mildew-proof coating, of the corrugated medium paper, wherein the hollow porous polymer microspheres are made of an acrylate copolymer. Weighing the following components in percentage by mass to obtain the adsorbent: 30% of potassium permanganate, 35% of methylcyclopropene, 20% of chromic oxide, 8% of activated carbon and 7% of montmorillonite. And mixing an adsorbent with water to obtain slurry, wherein the mass percentage concentration of the adsorbent is 0.5%, coating the slurry on one surface of the corrugated medium paper, which is far away from the mildew-proof coating, slowly drying the corrugated medium paper in an environment at 20 ℃ for 5 hours, and drying the corrugated medium paper in an oven at 60 ℃ for 2 hours to form the fresh-keeping coating. And finally, sequentially laminating and fixing the corrugated liner paper, the corrugated medium paper and the corrugated surface paper to obtain the mildew-proof fresh-keeping corrugated board, wherein the thickness of the mildew-proof coating is 3 micrometers, and the thickness of the fresh-keeping coating is 3 micrometers.
Example 4
The method comprises the steps of coating mildew-proof coating on one side of corrugated medium paper to form a mildew-proof coating, wherein the mildew-proof coating comprises 78% of water-absorbent resin and 22% of mildew-proof agent, the water-absorbent resin consists of 13% of polyvinyl alcohol 1788 and 87% of ethylene-vinyl acetate copolymer, and the mildew-proof agent consists of 25% of sodium ascorbate, 25% of trichlamide and 50% of kasong.
And (3) coating an ethanol solution of hollow porous polymer microspheres on the surface, far away from the mildew-proof coating, of the corrugated medium paper, wherein the hollow porous polymer microspheres are made of an acrylate copolymer. Weighing the following components in percentage by mass to obtain the adsorbent: 62 percent of potassium permanganate, 27 percent of methylcyclopropene, 8 percent of chromic oxide, 2 percent of active carbon and 1 percent of montmorillonite. And mixing an adsorbent with water to obtain slurry, wherein the mass percentage concentration of the adsorbent is 0.5%, coating the slurry on one surface of the corrugated medium paper, which is far away from the mildew-proof coating, slowly drying the corrugated medium paper in an environment at 20 ℃ for 5 hours, and drying the corrugated medium paper in an oven at 60 ℃ for 2 hours to form the fresh-keeping coating. And finally, sequentially laminating and fixing the corrugated liner paper, the corrugated medium paper and the corrugated surface paper to obtain the mildew-proof fresh-keeping corrugated board, wherein the thickness of the mildew-proof coating is 3 micrometers, and the thickness of the fresh-keeping coating is 3 micrometers.
Comparative example 1
A mildew-proof coating is coated on one side of corrugated medium paper to form a mildew-proof coating, wherein the mildew-proof coating comprises 78% of water-absorbent resin and 22% of mildew-proof agent, the water-absorbent resin consists of 7% of polyvinyl alcohol 1788, 6% of polyvinyl alcohol 2488 and 87% of methyl methacrylate-butyl acrylate-acrylic acid copolymer, and the mildew-proof agent consists of 25% of sodium ascorbate, 25% of salicylamide and 50% of karson.
Coating gelatin microspheres on one surface, far away from the mildew-proof coating, of the corrugated core paper, then mixing potassium permanganate with water to obtain slurry, wherein the mass percentage concentration of the potassium permanganate is 0.5%, coating the slurry on one surface, far away from the mildew-proof coating, of the corrugated core paper, then slowly drying the corrugated core paper in an environment of 20 ℃ for 5 hours, and then drying the corrugated core paper in an oven at 60 ℃ for 2 hours to form the fresh-keeping coating. And then sequentially laminating and fixing the corrugated liner paper, the corrugated medium paper and the corrugated surface paper to obtain the corrugated board, wherein the thickness of the mildew-proof coating is 3 micrometers, and the thickness of the fresh-keeping coating is 3 micrometers.
Comparative example 2
A mildew-proof coating is coated on one side of corrugated medium paper to form a mildew-proof coating, wherein the mildew-proof coating comprises 78% of water-absorbent resin and 22% of mildew-proof agent, the water-absorbent resin consists of 7% of polyvinyl alcohol 1788, 6% of polyvinyl alcohol 2488 and 87% of methyl methacrylate-butyl acrylate-acrylic acid copolymer, and the mildew-proof agent consists of 25% of sodium ascorbate, 25% of salicylamide and 50% of karson.
Weighing the following components in percentage by mass to obtain the adsorbent: 62 percent of potassium permanganate, 27 percent of methylcyclopropene, 8 percent of chromic oxide, 2 percent of active carbon and 1 percent of montmorillonite. And mixing an adsorbent with water to obtain slurry, wherein the mass percentage concentration of the adsorbent is 0.5%, coating the slurry on one surface of the corrugated medium paper, which is far away from the mildew-proof coating, slowly drying the corrugated medium paper in an environment at 20 ℃ for 5 hours, and drying the corrugated medium paper in an oven at 60 ℃ for 2 hours to form the fresh-keeping coating. And then sequentially laminating and fixing the corrugated liner paper, the corrugated medium paper and the corrugated surface paper to obtain the corrugated board, wherein the thickness of the mildew-proof coating is 3 micrometers, and the thickness of the fresh-keeping coating is 3 micrometers.
Comparative example 3
A mildew-proof coating is coated on one side of corrugated medium paper to form a mildew-proof coating, wherein the mildew-proof coating comprises 78% of water-absorbent resin and 22% of mildew-proof agent, the water-absorbent resin consists of 7% of polyvinyl alcohol 1788, 6% of polyvinyl alcohol 2488 and 87% of methyl methacrylate-butyl acrylate-acrylic acid copolymer, and the mildew-proof agent consists of 25% of sodium ascorbate, 25% of salicylamide and 50% of karson.
And (3) coating an ethanol solution of hollow porous polymer microspheres on the surface, far away from the mildew-proof coating, of the corrugated medium paper, wherein the hollow porous polymer microspheres are made of an acrylate copolymer. Weighing the following components in percentage by mass to obtain the adsorbent: 50% of methyl cyclopropene, 40% of chromium sesquioxide, 8% of activated carbon and 2% of montmorillonite. And mixing an adsorbent with water to obtain slurry, wherein the mass percentage concentration of the adsorbent is 0.5%, coating the slurry on one surface of the corrugated medium paper, which is far away from the mildew-proof coating, slowly drying the corrugated medium paper in an environment at 20 ℃ for 5 hours, and drying the corrugated medium paper in an oven at 60 ℃ for 2 hours to form the fresh-keeping coating. And finally, sequentially laminating and fixing the corrugated liner paper, the corrugated medium paper and the corrugated surface paper to obtain the corrugated board, wherein the thickness of the mildew-proof coating is 3 micrometers, and the thickness of the fresh-keeping coating is 3 micrometers.
The peaches with uniform size, no plant diseases and insect pests, no mechanical damage and similar maturity are selected and purchased in the market, 10 peaches are respectively packaged by the corrugated boards prepared in the examples 1 to 4 and the comparative examples 1 to 3, and the peaches are stored at room temperature. After 7 days, the average value of the hardnesses of the peaches of each example and comparative example was measured using a GY-B type fruit hardness tester. The average rotting rate of the peaches in each example and comparative example was measured after 12 days of storage, and the rotting rate was classified into 0-5 grade, 0 grade being no rotting, 1 grade being 20% or less, 2 grade being 20-40%, 3 grade being 40-60%, 4 grade being 60-80%, and 5 grade being 80-100% according to the mass percentage of rotted parts of the peaches. In addition, the ethylene concentration in the storage environment of each example and comparative example after 12 days of storage, and the weight loss ratio of peaches of each example and comparative example were measured.
Hardness is one of the important indicators for the storage stability and quality of peach fruits, and the size of the peach fruit can basically represent the edibility of the fruits, and generally speaking, high hardness is beneficial to storage. The acid content is closely related to the flavor of the fruit and is an important index influencing the flavor quality of the fruit. The detection results are shown in table 1, and it can be seen that compared with comparative examples 1 to 3, peaches packed by the mildewproof fresh-keeping corrugated cardboard of examples 1 to 4 have higher hardness after 7 days, the rotting rate after 12 days is very low, the ethylene concentration in the storage environment is obviously lower, the weight loss rate is lower, the moisture loss is less, and the effect of example 1 is the best. The mildew-proof coating of the mildew-proof fresh-keeping corrugated board can inhibit the growth of mildew in a package, the mildew is not easy to generate under the condition that fruits and vegetables are not pretreated, ethylene can be removed more efficiently by the fresh-keeping coating, and the respiration of the fruits and vegetables is not influenced, so that the preservation effect is improved, and the preservation duration is prolonged.
TABLE 1
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (3)
1. The mould-proof fresh-keeping corrugated board is characterized by comprising corrugated liner paper, corrugated core paper and corrugated surface paper which are sequentially stacked, wherein a mould-proof coating is arranged on one surface, close to the corrugated liner paper, of the corrugated core paper, a fresh-keeping coating is arranged on one surface, close to the corrugated surface paper, of the corrugated core paper, the fresh-keeping coating is composed of hollow porous polymer microspheres loaded with an adsorbent, the adsorbent comprises potassium permanganate, and at least part of the adsorbent is loaded in the hollow porous polymer microspheres; the adsorbent also comprises montmorillonite, activated carbon, chromium oxide and methylcyclopropene; in the adsorbent, the mass percentages of the potassium permanganate, the methylcyclopropene, the chromic oxide, the activated carbon and the montmorillonite are respectively 62%, 27%, 8%, 2% and 1%; the mildew-proof coating comprises the following components in percentage by mass: 78% of water-absorbent resin and 22% of mildew preventive, wherein the water-absorbent resin consists of 7% of polyvinyl alcohol 1788, 6% of polyvinyl alcohol 2488 and 87% of methyl methacrylate-butyl acrylate-acrylic acid copolymer, and the mildew preventive consists of 25% of sodium ascorbate, 25% of salicylamide and 50% of kasong.
2. The mold-proof fresh-keeping corrugated cardboard as claimed in claim 1, wherein a decorative layer is provided on a side of the corrugated surface paper remote from the corrugated core paper.
3. The preparation method of the mildewproof fresh-keeping corrugated board as claimed in any one of claims 1 to 2, which is characterized by comprising the following steps of:
forming the mildew-proof coating on one side of the corrugated medium paper;
coating an ethanol solution of hollow porous polymer microspheres on one surface of the corrugated medium paper, which is far away from the mildew-proof coating, coating a slurry obtained by mixing the adsorbent and water on one surface of the corrugated medium paper, which is far away from the mildew-proof coating, and drying to form the fresh-keeping coating;
and sequentially laminating and fixing the corrugated liner paper, the corrugated core paper with the mildew-proof coating and the fresh-keeping coating and the corrugated surface paper to obtain the mildew-proof fresh-keeping corrugated board.
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