CN112026319A - Barrier laminate for improved hermeticity in lunch boxes and method of making same - Google Patents

Barrier laminate for improved hermeticity in lunch boxes and method of making same Download PDF

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Publication number
CN112026319A
CN112026319A CN202010787175.7A CN202010787175A CN112026319A CN 112026319 A CN112026319 A CN 112026319A CN 202010787175 A CN202010787175 A CN 202010787175A CN 112026319 A CN112026319 A CN 112026319A
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lunch box
layer
sealability
barrier laminate
box
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黄和
沈宝星
马成功
侯雅丹
吴季纯
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Nanjing Normal University
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Nanjing Normal University
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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
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
    • B29C66/9141—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/92—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools
    • B29C66/924—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the pressure, the force, the mechanical power or the displacement of the joining tools
    • B29C66/9241—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the pressure, the force or the mechanical power
    • 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
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • 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
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
    • 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
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/308—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising acrylic (co)polymers
    • 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
    • B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
    • B65D65/38—Packaging materials of special type or form
    • B65D65/40—Applications of laminates for particular packaging purposes
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
    • C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
    • C08F220/10—Esters
    • C08F220/12—Esters of monohydric alcohols or phenols
    • C08F220/14—Methyl esters, e.g. methyl (meth)acrylate
    • 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
    • B32B2250/24—All layers being polymeric
    • 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
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/714—Inert, i.e. inert to chemical degradation, corrosion
    • B32B2307/7145—Rot proof, resistant to bacteria, mildew, mould, fungi
    • 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
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/724—Permeability to gases, adsorption
    • B32B2307/7242—Non-permeable
    • B32B2307/7244—Oxygen barrier
    • 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
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/726—Permeability to liquids, absorption
    • B32B2307/7265—Non-permeable
    • 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
    • B32B2439/00—Containers; Receptacles
    • B32B2439/70—Food packaging

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Laminated Bodies (AREA)
  • Wrappers (AREA)

Abstract

The invention discloses a barrier laminated material for improving the sealability of a lunch box and a preparation method thereof, belonging to the technical field of barrier materials, wherein the barrier laminated material comprises an inner layer, a middle layer and an outer layer which are arranged by hot-pressing superposition; the inner layer is made of semi-crystalline polymer, the middle layer is made of alkyl acrylate, the outer layer is made of polyester film and is used for the newly designed degradable environment-friendly packaging lunch box, the influence of water, oxygen, bacteria and the like in the air on the substances in the lunch box can be effectively isolated, and certain effects on the preservation of food flavor and the extension of food shelf life are achieved. In the invention, the degradable environment-friendly packaging lunch box is improved, and the groove buffer liquid is reserved at the lower box body part, so that the possibility of external sprinkling is reduced. The results of tests on the food preservation performance, the relative moisture permeability and the sealing performance of the degradable environment-friendly packaging lunch box provided by the invention show that the lunch box which is newly improved compared with the traditional lunch box has better food flavor preservation effect, more excellent sealing performance and wide application prospect.

Description

Barrier laminate for improved hermeticity in lunch boxes and method of making same
Technical Field
The invention belongs to the technical field of barrier materials, and particularly relates to a barrier laminated material for improving the sealability of a lunch box and a preparation method thereof.
Background
In order to improve the performance of containers, packages, etc., more and more researchers choose to cover the surface of the container or packaging material with other materials with excellent physical properties, and the materials are mixed to bring good barrier property, oxidation resistance, bacteriostasis, etc. to the package.
In recent years, in order to reduce the environmental pollution pressure, the degradable environment-friendly package has become a research hotspot, however, the degradable environment-friendly package has some problems in the application process, so that the degradable environment-friendly package is not as convenient as if. For plastic packaging cutlery box, degradable environmental protection packing cutlery box is because the reason of self material for the cutlery box itself especially the opening part laminating is not too tight, makes the easy composition in the air of food in the cutlery box influence, like oxygen oxidation etc. also can cause the bacterium to invade for long-time exposing, makes food flavor change, fresh-keeping period shorten, even food security descends. In addition, the leakproofness of degradable environmental protection packing cutlery box is not good directly to lead to easy spilling hourglass of in the cutlery box hot water juice cooking oil, influences the convenience that the cutlery box carried, and this is that the problem that the cutlery box packing can't avoid waiting to solve urgently.
Some progress has been made in the past for improving the sealing performance of the package, however, most of the sealing performance improvement results of the package are applied to the plastic package to improve the performance of the plastic package. For example, in CN 205555003U, Nie Hua Yao and the like invented a preservation box with good sealing performance; CN 110834455a discloses a food packaging material capable of prolonging the shelf life of food, such as luozaifa.
Obviously, for china where environmental protection is more and more important, serious pollution caused by plastic packaging makes it necessary to be slowly replaced by other materials, and degradable environment-friendly packaging is produced at the same time, but part of physical properties of the degradable environment-friendly packaging lunch box are still different from those of the plastic packaging, so that the performance of the degradable environment-friendly packaging lunch box is further improved, and it is necessary to practice achievements applied to plastic packaging on the degradable environment-friendly packaging lunch box.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide a barrier laminated material for improving the sealability of a meal box, which can effectively isolate the influence of water, oxygen, bacteria and the like in the air on substances in the meal box; the invention also provides a preparation method of the composition.
The technical scheme is as follows: in order to achieve the purpose, the invention provides the following technical scheme:
the barrier laminated material is used for improving the sealability of the lunch box, the inner surface and the outer surface of the rough product of the lunch box are coated with inner layers, and a middle layer and an outer layer are sequentially hot-pressed on the outer inner layer; the inner layer is made of a semi-crystalline polymer, the middle layer is made of alkyl acrylate, and the outer layer is made of a polyester film.
Further, the semi-crystalline polymer is selected from polyethylene and polypropylene.
Further, the middle layer also comprises an organic acid, a cationic emulsifier, an initiator, a regulator and a tackifier.
Further, the alkyl acrylate is selected from methyl acrylate, methyl methacrylate; the carboxylic acid group-containing monomer is selected from acrylic acid and fumaric acid; the cationic emulsifier is an amine derivative; the initiator is selected from diisopropyl peroxydicarbonate and dicyclohexyl peroxydicarbonate; the tackifier is polyacrylate.
Further, a method for preparing a barrier laminate for improving sealability of a lunch box, comprising the steps of:
1) preparing an inner layer from a semi-crystalline polymer made from a polyethylene material;
2) the middle layer is obtained by emulsion polymerization reaction and comprises 70-90% of alkyl acrylate, 3-5% of organic acid, 2-6% of cationic emulsifier, 2-6% of initiator, 2-6% of regulator and 2-7% of tackifier by mass percentage;
3) the outer layer is made of polyester film, specifically, the polyester film is made of phthalate and coated on the outer layer, and a polyethylene layer is coated on the outer layer;
4) coating the polyethylene semi-crystalline polymer on the inner surface and the outer surface of the rough lunch box product, then coating the acrylic acid alkyl ester emulsion polymer on the outer surface, directly and uniformly covering the rough lunch box product with phthalate substances (namely, one layer of the inner layer and three layers of the outer layer), and simultaneously fusing the three materials on the surface of the rough lunch box product by hot pressing.
Further, in the step 4), the hot-pressing condition is that the temperature is 80-150 ℃ and the pressure is 300-500 Kpa.
Has the advantages that: compared with the prior art, the barrier laminated material for improving the sealability of the lunch box and the preparation method thereof are applied to the newly designed degradable environment-friendly packaging lunch box, can effectively isolate the influence of water, oxygen, bacteria and the like in the air on the substances in the lunch box, and has certain effects on the preservation of food flavor and the extension of food shelf life. In the invention, the degradable environment-friendly packaging lunch box is improved, the grooves are reserved on the side of the lower box body, soup can easily enter but can not easily exit, and the possibility of spilling soup, water, oil and the like in the lunch box is reduced by buffering to a certain extent. The results of tests on the food preservation performance, the relative moisture permeability and the sealing performance of the degradable environment-friendly packaging lunch box show that the newly improved lunch box has better food flavor preservation effect, and compared with other lunch boxes, the lunch box has more excellent sealing performance and wide application prospect.
Drawings
FIG. 1 is a graph showing the relationship between the closing viscosity and the opening and closing times of the degradable environment-friendly packaging lunch box;
FIG. 2 is a diagram of a method for testing the sealing performance of the degradable environment-friendly packaging lunch box;
fig. 3 is a design pattern diagram for improving the sealability of the degradable environment-friendly packaging lunch box based on plant fibers.
Detailed Description
The invention will be further described with reference to the following drawings and specific embodiments.
The barrier laminated material is used for improving the sealability of the lunch box, the inner surface and the outer surface of the rough product of the lunch box are coated with inner layers, and a middle layer and an outer layer are sequentially hot-pressed on the outer inner layer; the inner layer is made of a semi-crystalline polymer, the middle layer is made of alkyl acrylate, and the outer layer is made of a polyester film. (the adhesive is different from the tackifier, the former is used for bonding different material frameworks, and the latter is used for increasing the self-viscosity of the emulsion polymer). the outer layer is made of a polyester film, and can effectively isolate air, water, light and the like.
The inner layer is made of semi-crystalline polymers such as polyethylene, terephthalate, polybutylene and the like, wherein the polyethylene crystalline polymer is preferred, has higher coefficient and tensile strength and good chemical corrosion resistance, and can effectively prevent the migration of food ingredients when uniformly distributed in the inner layer of the lunch box.
The middle layer adopts 70-90% of methyl acrylate, methyl methacrylate and other alkyl acrylates, and 3-5% of organic acid such as acrylic acid, fumaric acid and the like is added, so that the hydrophilicity is good, in the emulsion polymerization process, a cationic emulsifier (N-dodecyl dimethylamine and other amine derivatives) and the like can be used as a surface active compound for about 2-6%, an initiator is dicumyl peroxide 2-6%, a regulator is 2-6%, and a polyacrylate substance is used as a tackifier for 2-7%, so that the lunch box can be opened and bonded for multiple times.
The polyester film made of phthalate is coated on the outer layer to improve the elasticity of the material, and the polyethylene layer is coated on the outer layer to increase the tightness of the material.
The semi-crystalline polymer is prepared from polyethylene to uniformly distribute in the food contact layer of the lunch box by utilizing the advantages of higher coefficient and tensile strength of the semi-crystal, good chemical corrosion resistance and the like. Preferably 70-90% of a second monomer comprising an ester-based polyacrylonitrile such as: the emulsion polymer can be prepared by adding 3-5% of organic acid monomer such as acrylic acid, methacrylic acid, and fumaric acid with good hydrophilicity into alkyl acrylate such as methyl acrylate and methyl methacrylate. In the emulsion polymerization process, an emulsifier (a cationic emulsifier such as N-dodecyl dimethylamine and other amine derivatives, quaternary ammonium salts and the like) and the like can be used as a surfactant compound about 2-6%, an initiator is dicumyl peroxide, dicyclohexyl peroxydicarbonate and other dicarbonate peroxides 2-6%, a regulator 2-6%, an emulsion polymer obtained by using polyacrylate as a tackifier 2-7% is used as an intermediate layer, and a phthalate substance is used for preparing a polyester film for an outer layer. Coating the polyethylene semi-crystalline polymer on the inner and outer surfaces of the coarse product of the lunch box, coating the acrylic acid alkyl ester emulsion polymer on the outer layer, directly and uniformly covering the coarse product with phthalate, and fusing the three materials on the surface of the coarse product of the lunch box by hot pressing at the temperature of 80-150 ℃ and the pressure of 300-500 Kpa.
As shown in fig. 1, after the box is opened, the layer of material can still be closed by adhesion, and compared with other material boxes, the box of the present invention can be opened and closed. The test method of the sealing performance of the lunch box is shown in figure 2, and the paper at the sealing position of the lunch box hardly flies and bounces off, which shows that the lunch box has good sealing performance. The design pattern of the degradable environment-friendly packaging lunch box is shown in figure 3.
Barrier laminates for improved sealability in lunch boxes have application in containers, packaging, substance preservation and the like. Packaging containers of barrier laminates for improved sealing of the containers can be used in the food packaging market, in food preservation, and to extend the shelf life of food.
The barrier laminated material for improving the tightness of the lunch box is applied to the manufacture of the plant fiber degradable environment-friendly packaging lunch box, so that the overall performance of the lunch box is more beneficial. The design of the barrier layer and the selection of materials effectively isolate the permeation of air, water, bacteria, light and the like to the lunch box, so that the influence of the conventional factors on food is minimized, the flavor and freshness of the food are greatly reserved, and the food shelf life is prolonged. In addition, the improvement of the sealing performance is also beneficial to carrying the lunch box, the phenomenon of spilling and leaking of the common packing lunch box in the carrying process is effectively avoided, the material of the lunch box is easy to degrade, the pressure on environmental pollution is small, and the improvement of the sealing performance is more beneficial to the application of the lunch box in the market.
Example 1 preparation of barrier laminate 1 to improve the sealability of lunch boxes
The semi-crystalline polymer is prepared by polyethylene substances and is uniformly distributed on the food contact layer in the lunch box by utilizing the advantages of higher coefficient and tensile strength, good chemical corrosion resistance and the like of the semi-crystalline polymer; selecting 70% of second monomer methyl acrylate containing ester polyacrylonitrile; in addition, 5 percent of acrylic acid containing organic acid monomers, methacrylic acid and fumaric acid with good hydrophilicity are added to prepare an emulsion polymer, in the emulsion polymerization process, dodecyl ammonium chloride serving as a cationic emulsifier is used as a surface active compound for about 6 percent, diisopropyl peroxydicarbonate serving as an initiator is 6 percent, a regulator is 6 percent, and the polyacrylate is used as a tackifier for 7 percent to obtain the emulsion polymer serving as an intermediate layer; the polyester film is made of phthalate type substances and is used as the outer layer. Coating the polyethylene semi-crystalline polymer on the inner surface and the outer surface of the coarse product of the lunch box, then coating the methyl acrylate emulsion polymer, directly and uniformly covering the meal box with phthalate substances after the completion of the coating, and fusing the three layers of materials on the surface of the coarse product of the lunch box by hot pressing at the temperature of 120 ℃ and the pressure of 300 Kpa.
Example 2 preparation of barrier laminate 2 to improve sealability of lunch boxes
The semi-crystalline polymer is prepared from polyethylene and is uniformly distributed in the food contact layer of the lunch box. In the emulsion polymer, the content of ester polyacrylonitrile second monomer methyl acrylate is 70%, 5% of organic acid monomer acrylic acid, methacrylic acid and fumaric acid with good hydrophilicity are added to prepare the emulsion polymer, in the emulsion polymerization process, cationic emulsifier dodecyl ammonium chloride is used as a surface active compound for about 6%, initiator is 6% of dicyclohexyl peroxydicarbonate, regulator mercaptan is 6%, polyacrylate is used as a tackifier for 2-7% to obtain the emulsion polymer which is used as a middle layer, and di-n-octyl phthalate is used for preparing a polyester film which is used as an outer layer. Coating polyethylene semi-crystalline polymer on the inner and outer surfaces of the coarse product of the lunch box, then coating alkyl acrylate emulsion polymer, uniformly covering with di-n-octyl phthalate after the coating is finished, and fusing the three layers of materials on the surface of the coarse product of the lunch box by hot pressing at the temperature of 120 ℃ and the pressure of 300 Kpa.
Example 3 preparation of barrier laminate 3 to improve sealability of lunch box
The semi-crystalline polymer is prepared from polyethylene and is uniformly distributed in the food contact layer of the lunch box. Increasing the content of a second monomer methyl acrylate containing ester polyacrylonitrile in the emulsion polymer by 80 percent, additionally adding 3 percent of monomers containing organic acid, namely acrylic acid, methacrylic acid and fumaric acid to prepare the emulsion polymer, wherein in the emulsion polymerization process, cationic emulsifier dodecyl ammonium chloride is used as a surface active compound by about 4 percent, an initiator is diisopropyl peroxydicarbonate by 4 percent, a regulator mercaptan by 4 percent, and the polyacrylic ester is used as a tackifier by 5 percent to obtain the emulsion polymer as a middle layer; a polyester film was produced using di-n-butyl phthalate for the outer layer. Coating the polyethylene semi-crystalline polymer on the inner surface and the outer surface of the coarse product of the lunch box, then coating the acrylic acid alkyl ester emulsion polymer, directly and uniformly covering the meal box with the di-n-butyl phthalate, and fusing the three layers of materials on the surface of the coarse product of the lunch box by hot pressing at the temperature of 120 ℃ and the pressure of 300 Kpa.
Example 4 preparation of barrier laminate 4 to improve the sealability of lunch boxes
The semi-crystalline polymer is prepared from polyethylene and is uniformly distributed in the food contact layer of the lunch box. Increasing the content of a second monomer methyl acrylate containing polyacrylonitrile ester by 85 percent, additionally adding 3 percent of monomers containing organic acid, namely acrylic acid, methacrylic acid and fumaric acid to prepare an emulsion polymer, wherein in the emulsion polymerization process, a cationic emulsifier dodecyl ammonium chloride is used as a surface active compound by about 3 percent, an initiator is diisopropyl peroxydicarbonate by 3 percent, a regulator mercaptan by 3 percent, and a polyacrylic ester is used as a tackifier by 3 percent to obtain the emulsion polymer as a middle layer; a polyester film was produced using di-n-butyl phthalate for the outer layer. Coating the polyethylene semi-crystalline polymer on the inner surface and the outer surface of the coarse product of the lunch box, then coating the acrylic acid alkyl ester emulsion polymer, directly and uniformly covering the meal box with the di-n-butyl phthalate, and fusing the three layers of materials on the surface of the coarse product of the lunch box by hot pressing at the temperature of 120 ℃ and the pressure of 300 Kpa.
Example 5 preparation of barrier laminate 5 to improve sealability of lunch boxes
The semi-crystalline polymer is prepared by utilizing the light weight and good stability of the polypropylene substance and is distributed on the food contact layer inside the lunch box; selecting 70% of second monomer methyl acrylate containing ester polyacrylonitrile, adding 5% of acrylic acid containing organic acid monomers, methacrylic acid and fumaric acid with good hydrophilicity to prepare an emulsion polymer, wherein in the emulsion polymerization process, a cationic emulsifier N-dodecyl dimethylamine is used as a surface active compound for about 6%, an initiator is diisopropyl peroxydicarbonate 6%, a regulator is 6%, and an emulsion polymer is obtained by taking polyacrylic ester as a tackifier for 7% and is used as an intermediate layer; the polyester film is made of phthalate ester and is used for increasing the plasticity of the material at the outer layer. Coating the polypropylene semi-crystalline polymer on the inner surface and the outer surface of the coarse product of the lunch box, then coating the methyl methacrylate emulsion polymer, uniformly covering the coarse product with phthalate, and fusing the three layers of materials on the surface of the coarse product of the lunch box by hot pressing at the temperature of 110 ℃ and the pressure of 300 Kpa.
Example 6 preparation of barrier laminate 6 to improve sealability of lunch box
The semi-crystalline polymer is prepared from polypropylene and is uniformly distributed on the food contact layer inside the lunch box. In the emulsion polymer, the content of a second monomer methyl methacrylate containing polyacrylonitrile ester is 80%, and in addition, 3% of organic acid-containing monomers of acrylic acid, methacrylic acid and fumaric acid are added to prepare the emulsion polymer, in the emulsion polymerization process, cationic emulsifier dodecyl ammonium chloride is used as a surface active compound for about 4%, an initiator is diisopropyl peroxydicarbonate for 4%, a regulator mercaptan for 4%, and the emulsion polymer is obtained by using polyacrylic ester as a tackifier for 5% and is used as a middle layer; a polyester film was made using di-n-octyl phthalate for the outer layer. Coating the polyethylene semi-crystalline polymer on the inner surface and the outer surface of the coarse food box product, then coating the acrylic acid alkyl ester emulsion polymer, directly and uniformly covering the coarse food box product with di-n-octyl phthalate, and fusing the three layers of materials on the surface of the coarse food box product by hot pressing at the temperature of 110 ℃ and the pressure of 400 Kpa.
Example 7 preparation of barrier laminate 7 to improve sealability of lunch box
The semi-crystalline polymer is prepared from polypropylene and is uniformly distributed on the food contact layer inside the lunch box. In the emulsion polymer, the content of a second monomer methyl methacrylate containing polyacrylonitrile ester is 85 percent, in addition, 3 percent of monomers containing organic acid, namely acrylic acid, methacrylic acid and fumaric acid are added to prepare the emulsion polymer, in the emulsion polymerization process, cationic emulsifier dodecyl ammonium chloride is used as a surface active compound for about 3 percent, an initiator is diisopropyl peroxydicarbonate for 3 percent, a regulator mercaptan for 3 percent, and polyacrylic ester is used as a tackifier for 3 percent to obtain the emulsion polymer as a middle layer; a polyester film was produced using di-n-butyl phthalate for the outer layer. Coating the polyethylene semi-crystalline polymer on the inner surface and the outer surface of the coarse product of the lunch box, then coating the acrylic acid alkyl ester emulsion polymer, directly and uniformly covering the meal box with di-n-butyl phthalate, and fusing the three layers of materials on the surface of the coarse product of the lunch box by hot pressing at the temperature of 110 ℃ and the pressure of 400 Kpa.
Example 8 design and preparation of novel degradable environmentally friendly packaging Material based on plant fibers
Adding clean water into plant fiber raw materials, grinding the plant fiber raw materials into pulp according to a paper box preparation specified process, adding a waterproof agent, an oil-proof agent, a flow aid solution and the like into a pulp mixing tank according to a certain proportion and sequence, mixing the pulp, fusing, placing the pulp into forming equipment for hot press forming to obtain a crude product, respectively and uniformly coating the blocking laminated material on the inner surface and the outer surface of the degradable environment-friendly packaging lunch box, and obtaining a finished product after hot press finishing.
Example 9 barrier laminate for degradable environmentally friendly packaging lunchboxes
Under the same lunch box preparation process, the separation laminated materials 1,2,3,4,5,6 and 7 are respectively added to improve the performance of the lunch box, a batch of lunch boxes made of each material are randomly selected and tested for elasticity, compressive strength, flavor retention, reclosability, waterproof performance and sealing performance of the lunch box, the test results are shown in the following table 1, comprehensive consideration is given, and after the laminated separation material 6 is used, the comprehensive performance of the lunch box is optimal, so that the separation laminated material 6 is selected to prepare the novel degradable environment-friendly packaging lunch box.
TABLE 1 Effect of different composition barrier laminates on lunch box Performance
Figure BDA0002622437910000071
Example 10 Performance comparison of degradable environmental protection packaging lunch box and commercially available lunch box
Flavor testing: two kinds of food boxes which are circulated in the market and contain the same food as the food box are selected and stored in the same environment (air, water, light and the like) at room temperature, changes of color, smell, texture and the like of the food are observed and recorded every three hours, and the results show that the color, the smell and the texture of the food in the food boxes sold in the market are obviously changed within six to nine hours, the change of the food box in the invention is still not obvious within twelve hours, and the degradable environment-friendly packaging food box is more beneficial to food preservation.
Reclosable tack detection: randomly selecting three newly prepared airtight lunch boxes (different batches and different dates), respectively pulling the three lunch boxes by using the spring dynamometer, observing the force magnitude and recording the force magnitude, closing the pulled lunch boxes again, pulling the reading record again by using the spring dynamometer, repeating the steps for 10 times, recording table data and drawing a scatter diagram as shown in the attached drawing 1, wherein the force variation for pulling the lunch boxes is small in the previous four tests, the force for the fifth test to the eighth test is gradually reduced, the force basically keeps unchanged after the ninth test is reduced to 0.5 Newton, and the linear trends of the three lunch boxes are approximately the same. It is shown that the cutlery box according to the invention is relatively uniform and can be repeatedly opened and closed four times with good closure adhesion, on the basis of which several commercially available cutlery boxes are taken for testing, which clearly cannot be glued and sealed again (test data are given in table 1)
Relative moisture permeability performance test: the same material is used for imitating the mainstream square and round lunch boxes circulating on the market, 5g of drying agents are placed in the lunch boxes with three different styles by detecting the moisture permeability of the prepared material as reference, the lunch boxes are sealed and then placed in a constant temperature and humidity box for balancing, so that the internal and external pressure difference is stable, the weight of the drying agents is taken out and weighed after 8 hours, the result shows that the weight change of the drying agents of the lunch box is minimum, and compared with the moisture permeability of the material, the difference is minimum as shown in table 2, and the lunch box has the minimum relative moisture permeability, namely the highest waterproof performance.
And (3) testing the sealing performance: the displacement leakage detecting method is adopted, a sealed container is arranged on the outer cover of the lunch box, the negative pressure suction is adopted, if the tested lunch box has defects around the sealed part, air enters from the periphery of the sealed part due to the action of the upward negative pressure of the rubber sheet covering the container, so that the rubber sheet slowly rises, the tightness of the lunch box is judged to be good or bad, the lunch box is placed in the sealed container, the rubber sheet does not change, and the result shows that the tightness of the lunch box is good.
As can be seen from the attached table 2, compared with other existing lunch boxes, the novel plant fiber degradable environment-friendly packaging lunch box designed in the invention is convenient to carry, long in food preservation period, good in sealing performance, beneficial to improvement of the performance of the packaging lunch box, and also has certain significance in prolonging the storage life of food.
TABLE 2 test parameters for comparison with other existing meal boxes
Figure BDA0002622437910000091
The moisture permeability of the material was tested and compared with the moisture permeability of different types of lunch boxes made of the material, which shows the influence of the design of the lunch box on the moisture permeability, as shown in Table 3. It is found that the sample has a lower relative moisture permeability than the commercial lunch box, indicating that the waterproof performance of the lunch box is better than that of the commercial lunch box
TABLE 3 influence of design of degradable environment-friendly packaging lunch box on moisture permeability
Figure BDA0002622437910000092
It should be understood that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention, and it will be obvious to those skilled in the art that other variations or modifications may be made on the basis of the above description, and all embodiments may not be exhaustive, and all obvious variations or modifications may be included within the scope of the present invention.

Claims (6)

1. A barrier laminate for improving the sealability of a lunch box characterized by: coating an inner layer on the inner surface and the outer surface of the rough product of the lunch box, and sequentially hot-pressing a middle layer and an outer layer on the outer inner layer; the inner layer is made of a semi-crystalline polymer, the middle layer is made of alkyl acrylate, and the outer layer is made of a polyester film.
2. A barrier laminate for improving the sealability of a lunch box according to claim 1 wherein: the semi-crystalline polymer is selected from polyethylene, terephthalate, and polybutylene.
3. A barrier laminate for improving the sealability of a lunch box according to claim 1 wherein: the middle layer also comprises a carboxylic acid group-containing monomer, a cationic emulsifier, an initiator, a regulator and a tackifier.
4. A barrier laminate for improving the sealability of a lunch box according to claim 3 wherein: the alkyl acrylate is selected from methyl acrylate and methyl methacrylate; the carboxylic acid group-containing monomer is selected from acrylic acid and fumaric acid; the cationic emulsifier is an amine derivative; the initiator is selected from diisopropyl peroxydicarbonate and dicyclohexyl peroxydicarbonate; the tackifier is polyacrylate.
5. A method of making a barrier laminate for improving the sealability of a lunchbox according to any of claims 1-4 comprising the steps of:
1) preparing an inner layer from a semi-crystalline polymer made from a polyethylene material;
2) the middle layer is obtained by emulsion polymerization reaction and comprises 70-90% of alkyl acrylate, 3-5% of organic acid, 2-6% of cationic emulsifier, 2-6% of initiator, 2-6% of regulator and 2-7% of tackifier by mass percentage;
3) the outer layer is made of polyester film, specifically, the polyester film is made of phthalate and coated on the outer layer, and a polyethylene layer is coated on the outer layer;
4) coating the polyethylene semi-crystalline polymer on the inner surface and the outer surface of the coarse food box product, then coating the alkyl acrylate emulsion polymer on the outer surface, directly and uniformly covering the coarse food box product with a phthalate substance, and fusing the three layers of materials on the surface of the coarse food box product by hot pressing.
6. A method of making a barrier laminate for improving the sealability of a lunch box as claimed in claim 5 wherein: in the step 4), the hot-pressing condition is that the temperature is 80-150 ℃ and the pressure is 300-500 Kpa.
CN202010787175.7A 2020-08-07 2020-08-07 Barrier laminate for improved hermeticity in lunch boxes and method of making same Pending CN112026319A (en)

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CN202592861U (en) * 2012-05-21 2012-12-12 上海界龙永发包装印刷有限公司 Printing aluminum foil packing paper for tomato sauce or cheese
CN203410125U (en) * 2013-05-16 2014-01-29 常州市鑫灿食品有限公司 Composite film for food packages
CN205060404U (en) * 2015-10-26 2016-03-02 中山市东森纸业有限公司 PET bowl cover membrane
CN111073127A (en) * 2019-12-23 2020-04-28 安徽硕通网络科技有限公司 Degradable disposable takeout lunch box and preparation method thereof

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1515740A (en) * 2002-12-25 2004-07-28 海渡化学工业株式会社 Laminated film for paper pulp moulded goods
CN1930231A (en) * 2004-01-08 2007-03-14 纳幕尔杜邦公司 Composition comprising ethylene copolymers and polyolefin
CN101631634A (en) * 2007-02-20 2010-01-20 巴斯夫欧洲公司 Sealable laminate for resealable packaging
CN102712723A (en) * 2009-12-18 2012-10-03 巴斯夫欧洲公司 Cold sealed recloseable packaging and composition for the production thereof
CN202592861U (en) * 2012-05-21 2012-12-12 上海界龙永发包装印刷有限公司 Printing aluminum foil packing paper for tomato sauce or cheese
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CN205060404U (en) * 2015-10-26 2016-03-02 中山市东森纸业有限公司 PET bowl cover membrane
CN111073127A (en) * 2019-12-23 2020-04-28 安徽硕通网络科技有限公司 Degradable disposable takeout lunch box and preparation method thereof

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