CN114162449A - Dry compound paper plastic zipper packaging bag and preparation method thereof - Google Patents

Dry compound paper plastic zipper packaging bag and preparation method thereof Download PDF

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Publication number
CN114162449A
CN114162449A CN202111407586.XA CN202111407586A CN114162449A CN 114162449 A CN114162449 A CN 114162449A CN 202111407586 A CN202111407586 A CN 202111407586A CN 114162449 A CN114162449 A CN 114162449A
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layer
packaging bag
parts
dry
polyamide
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CN202111407586.XA
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CN114162449B (en
Inventor
黄义军
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Chengdu Zhongheng Printing Co ltd
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Chengdu Zhongheng Printing Co ltd
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Classifications

    • 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
    • B65D33/00—Details of, or accessories for, sacks or bags
    • B65D33/16—End- or aperture-closing arrangements or devices
    • B65D33/25—Riveting; Dovetailing; Screwing; using press buttons or slide fasteners
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D22/00—Producing hollow articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • B31B70/26—Folding sheets, blanks or webs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • B31B70/60—Uniting opposed surfaces or edges; Taping
    • B31B70/62—Uniting opposed surfaces or edges; Taping by adhesives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • B31B70/60—Uniting opposed surfaces or edges; Taping
    • B31B70/64—Uniting opposed surfaces or edges; Taping by applying heat or pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • B31B70/74—Auxiliary operations
    • B31B70/81—Forming or attaching accessories, e.g. opening devices, closures or tear strings
    • B31B70/813—Applying closures
    • B31B70/8131—Making bags having interengaging closure elements
    • 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
    • B32B27/06—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
    • B32B27/10—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 paper or cardboard
    • 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
    • B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
    • B32B27/20—Layered products comprising a layer of synthetic resin characterised by the use of special additives using fillers, pigments, thixotroping agents
    • 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
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • 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
    • 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
    • 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
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/10—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure
    • 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
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • 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
    • 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
    • B32B2307/30—Properties of the layers or laminate having particular thermal properties
    • B32B2307/31—Heat sealable
    • 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
    • B32B2307/71—Resistive to light or to UV
    • 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
    • B32B2307/724—Permeability to gases, adsorption
    • B32B2307/7242—Non-permeable
    • B32B2307/7246—Water vapor 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
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/73—Hydrophobic
    • 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
    • B32B2553/00—Packaging equipment or accessories not otherwise provided for

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Laminated Bodies (AREA)

Abstract

The application relates to the field of paper-plastic packaging bags, and particularly discloses a dry-compound paper-plastic zipper packaging bag and a preparation method thereof. The dry compound paper plastic zipper packaging bag comprises a bag body and a zipper arranged on the bag body, wherein the bag body is made of a composite film; the composite film sequentially comprises a BOPP layer, a first bonding layer, a kraft layer, a second bonding layer, a PET layer, a third bonding layer and a PE layer from outside to inside; the PE layer is prepared from the following raw materials in parts by weight: 20-50 parts of LDPE, 50-80 parts of HDPE, 15-20 parts of polyamide fiber, 3-6 parts of cross-linking agent and 1-3 parts of antioxidant. The zipper packaging bag is moulded to dry compound paper has the advantages that zipper department is level and smooth, no layering is generated, the barrier property is good, the ultraviolet resistance is strong, the hydrophobicity of the PE layer is high, and liquid products are not easy to remain.

Description

Dry compound paper plastic zipper packaging bag and preparation method thereof
Technical Field
The application relates to the technical field of paper-plastic packaging bags, in particular to a dry-compound paper-plastic zipper packaging bag and a preparation method thereof.
Background
The paper-plastic composite is an important technology in the packaging industry, is prepared by compounding paper and polymer films (such as BOPP, PET, PVC and the like), and has the advantages of moisture resistance, pollution resistance, anti-counterfeiting, folding resistance, bright color and the like. At present, the paper-plastic composite technology is mainly compounded by dry composite and water-based cold pasting, wherein the dry composite is to coat emulsion type acrylate adhesive on a plastic film, dry the water, and form a viscous flow-shaped adhesive layer under the action of a hot pressing roller, so that the purpose of bonding a composite surface is achieved.
The paper-plastic packaging bag begins to be popularized and applied in various fields such as food packaging, medical treatment and health, cosmetics and the like, and in the prior art, the Chinese patent application with the application number of CN201810559668.8 discloses a paper-plastic packaging bag which comprises a paper substrate layer, an air barrier layer and thermoplastic resin, and the preparation method of the paper-plastic packaging bag comprises the following steps: coating a polyvinyl alcohol aqueous solution on a paper substrate layer, drying to obtain an air barrier layer, and combining the air barrier layer and a thermoplastic resin layer into a whole through a dry lamination forming method or an extrusion lamination method, wherein the thermoplastic resin is polyethylene resin, polypropylene resin or propylene copolymer.
In view of the above-mentioned related technologies, the inventor believes that, when the packaging bag is used for food packaging at present, the zipper is additionally arranged on the packaging bag to seal the residual product in the packaging bag, so as to reduce the contact between the product in the packaging bag and the external environment and guarantee the product quality, but when the thermoplastic resin is sealed with the zipper in a hot pressing manner, the thermal shrinkage rate of the existing packaging bag is smaller than that of the zipper, so that the existing packaging bag cannot shrink freely, and the thermoplastic resin layer is easy to shrink and even the zipper part is delaminated.
Disclosure of Invention
In order to prevent the delamination phenomenon of the zipper on the paper-plastic packaging bag during heat sealing, the application provides a dry-compound paper-plastic zipper packaging bag and a preparation method thereof.
In a first aspect, the application provides a zipper packaging bag is moulded to dry compound paper, adopts following technical scheme:
a dry compound paper-plastic zipper packaging bag comprises a bag body and a zipper arranged on the bag body, wherein the bag body is made of a composite film;
the composite film sequentially comprises a BOPP layer, a first bonding layer, a kraft layer, a second bonding layer, a PET layer, a third bonding layer and a PE layer from outside to inside;
the PE layer is prepared from the following raw materials in parts by weight: 20 to 50 portions of the rubber have a melt index of 0.23 to 0.43g/10min and a density of 0.92 to 0.924g/cm350 to 80 portions of LDPE with the melt index of 0.75 to 0.9g/10min and the density of 0.923 to 0.961g/cm315-20 parts of polyamide fiber, 3-6 parts of a cross-linking agent and 1-3 parts of an antioxidant.
By adopting the technical scheme, the PE layer is prepared by LDPE, HDPE and other substances, and the polyamide fiber is doped, and has stronger cohesive force and stronger surface polarity because the main chain of the polyamide macromolecule has strong polar peptide amine bonds, so that the polyamide fiber has good barrier property to oxygen, non-polar gases and hydrocarbons, and the polyamide fiber has large shrinkage at the temperature of 120-; in addition, the LDPE has the advantages of more branched chains, lower crystallinity and high shrinkage rate, the melt of the LDPE is rapidly increased after being stretched to a certain extent, the LDPE is not easy to crack during hot pressing, the tensile breaking stress and the tensile yield stress are high, the heat sealing temperature is low, the energy consumption is reduced, and the HDPE can form a net structure under the action of a cross-linking agent to improve the shrinkage rate, so that the PE layer can be freely shrunk when being compounded with a zipper, and the heat sealing position of the zipper is prevented from being layered.
Preferably, the cross-linking agent comprises dicumyl peroxide and bis (tert-butylperoxy) diisopropylbenzene in a mass ratio of 1: 0-0.5.
By adopting the technical scheme, dicumyl peroxide is used as a cross-linking agent, the cross-linking degree of HDPE and LDPE can be increased, the HDPE and LDPE are cross-linked to generate a macromolecular network structure, and double BP is used as a cross-linking promoter of dicumyl peroxide, so that the intermolecular grid density and the intermolecular acting force can be increased, and the shrinkage rate of the macromolecular chain is larger during heat sealing.
Preferably, the preparation method of the PE layer comprises the steps of: blending HDPE, LDPE, polyamide fiber and antioxidant, melting at 140-150 ℃, adding a cross-linking agent, mixing at 140-150 ℃ for 1-3min, extruding, blowing and cooling.
By adopting the technical scheme, LDPE, HDPE, polyamide fiber and the like are mixed and melted, extruded, blown and cooled to prepare the PE film, the preparation method is simple, the prepared PE layer has good mechanical property and large thermal shrinkage, and the PE film is not easy to delaminate when being thermally sealed with a zipper.
Preferably, the polyamide fiber comprises the following raw materials in parts by weight: 7-9 parts of polyamide 66, 3-5 parts of modified nano montmorillonite, 10-20 parts of polyvinyl chloride and 5-10 parts of nano polytetrafluoroethylene.
By adopting the technical scheme, the polyamide 66 and the nano montmorillonite have better compatibility, the modified nano montmorillonite can improve the barrier property of the polyamide 66, in addition, the thermal shrinkage temperature of the polyvinyl chloride is low, the transverse shrinkage rate is large, the shrinkage rate of polyamide fibers can be enhanced, the occurrence of the zipper layering phenomenon is reduced, the nano polytetrafluoroethylene has better hydrophobicity and ultraviolet resistance effect, the liquid product can be prevented from being poured incompletely when the packaging bag is used for packaging the liquid product, the liquid product is attached to the PE layer in the packaging bag, the outdoor service life of the packaging bag can be prolonged, and the quality guarantee period of the product is prolonged.
Preferably, the polyamide fiber is prepared by the following method:
drying polyamide 66, mixing with the modified nano montmorillonite uniformly, heating to a molten state, and spinning to form polyamide 66 fibers;
pulverizing the prepared polyamide 66 fiber to nanometer level, adding polyvinyl chloride, plasticizer and lubricant, heating to 160-200 deg.C, spinning, stretching and shaping to obtain mixed fiber;
plasma cleaning the mixed fiber with carbon tetrafluoride for 3-5min, immediately placing into a closed space containing nano polytetrafluoroethylene, and vacuumizing to (5-5.5) × 10-3Heating to the temperature of 360-380 ℃ under the MPa, preserving the heat for 5-10min, and cooling to the room temperature to obtain the polyamide fiber.
By adopting the technical scheme, the polyamide 66 and the modified nano montmorillonite have good compatibility, and when the polyamide 66 and the modified nano montmorillonite are melted, the modified nano montmorillonite can be stably dispersed in a polyamide 66 matrix, so that the barrier property of the prepared polyamide 66 fiber is improved; the preparation method comprises the steps of crushing polyamide 66 fibers, mixing the crushed polyamide 66 fibers with polyvinyl chloride, a plasticizer and a lubricant, melting and spinning, wherein the melting temperature of the polyvinyl chloride is lower than that of the polyamide 66 fibers, so that the polyamide 66 fibers cannot be melted, the surfaces of polyamide 66 fiber particles are coated with the polyvinyl chloride to prepare mixed fibers, the polyvinyl chloride is coated on the crushed mixed fibers after being melted, then carbon tetrafluoride plasma is used for effective surface cleaning and activation, carbon tetrafluoride particles bombard a polyvinyl chloride material, the surface roughness of the polyvinyl chloride material is changed, fluorine is introduced and is superposed with broken chemical bonds, the surface of the polyvinyl chloride is fluorinated, the surface energy of the polyvinyl chloride is reduced, conditions are provided for deposition of the nano polytetrafluoroethylene, and the bonding fastness of the nano polytetrafluoroethylene and the polyvinyl chloride on the surfaces of the mixed fibers is improved; nanometer polytetrafluoroethylene evaporates to mixed fiber surface under high temperature, when handling because of plasma, introduce fluorine element on mixed fiber surface, provide powerful condition to the adhesion of follow-up polytetrafluoroethylene, when the large tracts of land deposit polytetrafluoroethylene on the polyvinyl chloride, the polyvinyl chloride surface is decorated, surface energy reduces, make polyamide fiber have stronger hydrophobicity and separation nature, in addition because fluoropolymer has higher reflection ultraviolet performance, make polyamide fiber's ultraviolet resistance can be promoted, better ageing resistance has, the outdoor life of wrapping bag has been prolonged.
Preferably, the preparation method of the modified nano montmorillonite comprises the following steps:
mixing 2-5 parts of nano montmorillonite and 5-10 parts of deionized water by weight to prepare suspension, and adjusting the pH value to 1-2;
(2) placing 1-2 parts of nano graphene oxide in 5-10 parts of N, N-dimethylformamide, performing ultrasonic treatment for 10-20min, adding 10-20 parts of isophorone diisocyanate, stirring for 20-24h under the protection of nitrogen, washing with dichloromethane, and performing freeze drying to obtain functionalized graphene oxide;
(3) and (3) adding 0.5-1 part of dioctadecyl dimethyl ammonium chloride and the functionalized graphene oxide prepared in the step (2) into the product obtained in the step (1), uniformly stirring at 80-100 ℃, filtering, washing with deionized water, and drying.
By adopting the technical scheme, after isophorone diisocyanate is modified, a large number of carbamate groups are arranged on the surface of graphene oxide, so that the interlayer hydrogen bond acting force of nano graphene oxide is weakened, the dispersibility is good, the graphene oxide has good compatibility with polyamide 66, the dispersibility of montmorillonite in the polyamide 66 can be improved by the functionalized graphene oxide, and after the montmorillonite suspension is mixed with dioctadecyl dimethyl ammonium chloride, the hydrophobicity of the montmorillonite suspension is improved, so that the barrier property and the hydrophobicity of polyamide fibers can be improved; graphene oxide and nano montmorillonite are uniformly dispersed in polyamide 66, oxygen energy micromolecular substances pass through the PE layer and need to bypass the impermeable materials, the path of oxygen and the like passing through the PE layer is greatly prolonged, a tortuous path is formed, the barrier property of polyamide 66 fibers can be obviously improved, a network interwoven structure can be formed in the polyamide 66 fibers by the graphene oxide and the montmorillonite, the mechanical property of the polyamide 66 is improved, and the breaking force of the PE layer is further improved.
Preferably, the heat setting method comprises the following steps: soaking the spinning product in water at 90-100 deg.C for 20-30 min.
By adopting the technical scheme, the water molecules have a plasticizing effect, and penetrate into the fiber molecule chain segment, so that the fiber is easy to slide, the orientation is easier to carry out, and the thermal contraction is easier to occur when the fiber is melted and thermally sealed.
Preferably, the first bonding layer and the second bonding layer are single-component polyurethane adhesives, and the third bonding layer is a double-component polyurethane adhesive.
By adopting the technical scheme, the single-component polyurethane adhesive has high molecular weight and high viscosity, can enhance the adhesion of the BOPP layer and the kraft paper layer, and prevents delamination during heat sealing; the double-component polyurethane adhesive is used for bonding the PET layer and the PE layer, so that the zipper is not easy to delaminate when the PE layer is subjected to heat sealing.
In a second aspect, the application provides a method for preparing a dry-compound paper plastic zipper packaging bag, which adopts the following technical scheme: a preparation method of a dry compound paper plastic zipper packaging bag comprises the following steps:
s1, brushing a single-component polyurethane adhesive on two sides of kraft paper to obtain a first bonding layer and a second bonding layer;
s2, printing the BOPP film, compounding the BOPP film with the first bonding layer, compounding the PET film with the second bonding layer, and curing;
s3, brushing a bi-component polyurethane adhesive on one side of the PET film far away from the second adhesive layer to form a third adhesive layer, compounding the PE film on the third adhesive layer, curing, and slitting to form a composite film;
s4, folding the composite film, placing the PE zipper between the PE layers, and heat-sealing for 0.5-1S at the temperature of 120-150 ℃ and under the condition of 25-35N to obtain the dry-compound paper plastic zipper packaging bag.
By adopting the technical scheme, firstly, kraft paper is bonded with the BOPP film and the PET film, then the PE film is bonded on the PET film by using a bi-component polyurethane adhesive, and then curing, bag making and heat sealing of the zipper are carried out, so that the preparation method is simple.
Preferably, the gluing amount of the one-component polyurethane glue binder on both sides of the kraft paper is 3.8-4g/m2Curing for 20-24h at 50-80 deg.C;
the gluing amount of the bi-component polyurethane adhesive PET film is 1.3-1.5g/m2Curing time is 30-36h, and temperature is 40-50 ℃.
By adopting the technical scheme, if the using amount of the single-component polyurethane adhesive is less, the single-component polyurethane adhesive cannot fully permeate into kraft paper, so that the bonding strength is low, the surface powder spraying of printed matters on a BOPP film cannot be covered, the rough printed matters cannot be filled, the glossiness and the fullness of the composite packaging bag are poor, and the appearance quality is reduced; if the gluing amount of the single-component polyurethane adhesive is large, the glue is difficult to dry, and the efficiency is low.
In summary, the present application has the following beneficial effects:
1. according to the application, the LDEP and the HDPE are used as main raw materials of the PE layer and are matched according to the mass ratio of 2-5:5-8, and the HDPE and the LDPE are crosslinked to form a network structure under the action of the crosslinking agent, so that the heat shrinkage rate of the PE layer is enhanced, the situation of delamination at the zipper position when the zipper and the PE layer are subjected to heat sealing is reduced, and the barrier property of the packaging bag is improved.
2. Preferably adopt polyamide 66, polyvinyl chloride, nanometer polytetrafluoroethylene etc. to prepare polyamide fiber in this application, polyamide 66 fiber is under the effect of modified nanometer montmorillonite, separation nature reinforcing, under polyvinyl chloride's cladding effect, polyamide 66 fiber's heat shrinkage factor increases, and after carbon tetrafluoride plasma treatment, deposit nanometer polytetrafluoroethylene on polyvinyl chloride surface again, polyamide fiber's hydrophobicity has not only been improved, make the wrapping bag when packing liquid product, liquid product is difficult for remaining on the PE layer, still improve its ultraviolet resistance, the life of extension wrapping bag.
3. In the application, isophorone diisocyanate is preferably used for functionally modifying graphene oxide to improve the barrier property of graphene oxide, and then octadecyl dimethyl ammonium chloride is used for intercalating sodium montmorillonite to improve the hydrophobic property of the sodium montmorillonite, so that the functionalized graphene oxide can improve the compatibility and the dispersibility of montmorillonite and polyamide 66 in melting, improve the barrier property of polyamide fibers to water vapor and oxygen, and improve the hydrophobic property and the ultraviolet resistance of the polyamide fibers.
4. In the application, the BOPP film and the kraft paper are preferably connected by using the single-component polyurethane adhesive, the kraft paper and the PET layer are preferably connected by using the double-component polyurethane adhesive, and the PET layer and the PE layer are connected by using the single-component polyurethane adhesive and the double-component polyurethane adhesive, so that the single-component polyurethane adhesive and the double-component polyurethane adhesive have high viscosity and high bonding strength, and the phenomenon that the composite film is delaminated due to the fact that the viscosity of the adhesive is smaller than the shrinkage stress of the film is prevented when the zipper is subjected to heat sealing.
Detailed Description
Preparation examples 1 to 4 of modified Nano montmorillonite
In preparation examples 1-4, the nano graphene oxide is selected from Sichuan reclamation science and technology development Co., Ltd, the product number is KY-GtO1212, and the isophorone diisocyanate is selected from Xuzhou bright Jinyang New materials Co., Ltd, the model number is 018; the dioctadecyl dimethyl ammonium chloride is selected from Suzhou Yuntan chemical company, model D1821.
Preparation example 1: mixing 2kg of nano montmorillonite and 5kg of deionized water to prepare a suspension, and adjusting the pH value to 1;
(2) putting 1kg of nano graphene oxide into 5kg of N, N-dimethylformamide, performing ultrasonic treatment for 10min, adding 10kg of isophorone diisocyanate, stirring for 24h under the protection of nitrogen, washing for 3 times by using dichloromethane, and performing freeze drying for 4h at-10 ℃ to obtain functionalized graphene oxide;
(3) and (2) adding 0.5kg of dioctadecyl dimethyl ammonium chloride and functionalized graphene oxide into the product obtained in the step (1), uniformly stirring at 80 ℃, filtering, washing with deionized water, and drying.
Preparation example 2: the difference from preparation example 1 is that the functionalized graphene prepared in step (2) is not added in step (3).
Preparation example 3: the difference from preparation example 1 is that in step (2), isophorone diisocyanate was not added.
Preparation example 4: the difference from preparation example 1 is that dioctadecyldimethylammonium chloride was not added in step (3).
Preparation examples 5 to 11 of Polyamide fibers
Preparation examples 5-11 Polyamide 66 was selected from Jiangsu Binxian plastication Inc., having a Cat number of R525H; the polyvinyl chloride is selected from Ningbo Dongyue plastication Co., Ltd, with the product number of SG-5; the castor oil is selected from commercial and trade company of Jinan Chang Zhi, with a product number of 01; the polyethylene wax is selected from chemical technology limited of Jinnan Yuan Baolai, and has a product number of 031; the nano polytetrafluoroethylene is selected from the taurulata plastic material Co., Ltd, Dongguan, with the trade name of TF-9207.
Preparation example 5: (1) drying 7kg of polyamide 66, uniformly mixing with 3kg of modified nano-montmorillonite, heating to a molten state, spinning to form the polyamide 66 fiber, mixing the modified montmorillonite with 2kg of sodium-based montmorillonite and 5kg of deionized water, adjusting the pH value to1, mixing with 0.1k of coupling agent KH550, and drying to obtain the polyamide fiber;
(2) crushing the amide 66 fiber prepared in the step (1) to 100nm, adding 10kg of polyvinyl chloride, 1kg of plasticizer and 1kg of lubricant, heating to 160 ℃ and 200 ℃, spinning, stretching and shaping to prepare mixed fiber, wherein the plasticizer is castor oil, the lubricant is polyethylene wax, and the stretching and shaping method comprises the following steps: soaking the spinning product in water at 100 deg.C for 30 min;
(3) putting the mixed fiber prepared in the step (2) into an ICP-500 full-automatic inductively coupled plasma etching machine, carrying out plasma cleaning for 5min by using carbon tetrafluoride, immediately putting the nano polytetrafluoroethylene into a closed space of an ZHD-300M2 high-vacuum resistance evaporation coating machine, and vacuumizing to 5 multiplied by 10-3And (4) heating to 360 ℃ under the MPa, preserving heat for 10min, and cooling to room temperature to obtain the polyamide fiber with the length of 1 mu m, wherein the gas flow of the carbon tetrafluoride plasma is 50sccm, and the power of a direct current power supply is 50W during cleaning.
Preparation example 6: the difference from preparation example 5 is that the carbon tetrafluoride plasma cleaning was not performed in step (3).
Preparation example 7: the difference from preparation example 5 is that the nano-polytetrafluoroethylene high-temperature evaporation is not carried out in step (3).
Preparation example 8: the difference from preparation example 5 is that modified nano montmorillonite is prepared by preparation example 1.
Preparation example 9: the difference from preparation example 5 is that modified nano montmorillonite is prepared by preparation example 2.
Preparation example 10: the difference from preparation example 5 is that modified nano montmorillonite is prepared by preparation example 3.
Preparation example 11: the difference from preparation example 5 is that modified nano montmorillonite is prepared by preparation example 4.
Preparation examples 12 to 24 of PE layers
The specifications of the raw materials for HDPE and LDPE in preparation examples 12-17 are shown in Table 1.
TABLE 1 sources of HDPE and LDPE in examples 12-17
Figure BDA0003372861990000061
Figure BDA0003372861990000071
Preparation example 12: according to the mixture ratio in the table 2, HDPE, LDPE, polyamide fiber and antioxidant are blended and then melted at 50 ℃, a cross-linking agent is added, the mixture is mixed for 3min at 150 ℃, and then extruded, blown and cooled, wherein the polyamide fiber is selected from commercial products, the length of the polyamide fiber is 1mm, the antioxidant is 1010 type, the melt index of the LDPE is 0.3g/10min, and the density of the polyamide fiber is 0.924g/cm3The density of HDPE is 0.75g/10min, and the density is 0.923g/cm3。
TABLE 2 raw material ratios of PE layers in preparation examples 12 to 16
Figure BDA0003372861990000072
Preparation examples 13 to 16: the difference from preparation example 12 is that the raw material formulation is shown in table 2.
Preparation example 17: differs from preparation 12 in that LDPE has a melt index of 0.23 to 0.43g/10min and a density of 0.92 to 0.924g/cm3The HDPE has a melt index of 0.9g/10min and a density of 0.961g/cm3。
Preparation examples 18 to 24: the difference from preparation example 12 is that the source of the polyamide fiber is shown in Table 3.
TABLE 3 sources of Polyamide fibers in preparations 18 to 24
Preparation example Sources of polyamide fibres
Preparation example 12 Is commercially available
Preparation example 18 Preparation example 5
Preparation example 19 Preparation example 6
Preparation example 20 Preparation example 7
Preparation example 21 Preparation example 8
Preparation example 22 Preparation example 9
Preparation example 23 Preparation example 10
Preparation example 24 Preparation example 11
Examples
In the embodiment, the single-component polyurethane adhesive is selected from Shanghai Kangda chemical new material company Limited and is of the type WD8196, and the double-component polyurethane adhesive is selected from Shanghai Kangda chemical new material company Limited and is of the type WD 8166A/B.
Example 1: a dry compound paper-plastic zipper packaging bag comprises a zipper and a packaging bag, wherein the packaging bag comprises a BOPP layer, a first bonding layer, a kraft layer, a second bonding layer, a PET layer, a third bonding layer and a PE layer which are sequentially stacked, wherein the first bonding layerThe layer and the second bonding layer are single-component polyurethane adhesive, the third bonding layer is double-component polyurethane adhesive, the thickness of the BOPP layer is 18 mu m, and the gram weight of the kraft paper is 70g/m2The PET layer was 12 μm thick and the PE layer 40 μm thick.
The preparation method of the dry compound paper plastic zipper packaging bag comprises the following steps:
s1, coating a single-component polyurethane adhesive on two sides of the kraft paper to obtain a first bonding layer and a second bonding layer, wherein the gluing amount of the single-component polyurethane adhesive on the two sides of the kraft paper is 3.8g/m2；
S2, printing a BOPP film, compounding the printed BOPP film with the first bonding layer, compounding the PET film with the second bonding layer, and curing at 50 ℃ for 24 hours under the condition that the compounding pressure of the BOPP film with the first bonding layer and the compounding pressure of the PET film with the second bonding layer are all 1.8 MPa; s3, brushing a bi-component polyurethane adhesive on one side of the PET film far away from the second adhesive layer to form a third adhesive layer, compounding the PE layer on the third adhesive layer, curing, and slitting to form a composite film, wherein the gluing amount of the bi-component polyurethane adhesive is 1.3g/m2The composite pressure is 1MPa, the curing temperature is 40 ℃, the curing time is 36 hours, and the PE layer is prepared by the preparation example 13;
s4, folding the composite film, placing the PE zipper between the PE layers, and heat-sealing for 1S at 120 ℃ and 35N to obtain the dry-compound paper plastic zipper packaging bag.
Examples 2 to 14: a dry-coated paper zipper pack, which is different from example 1 in that the PE layer was prepared as shown in Table 4.
Table 4 preparation of PE layers in examples 1-14
Examples Preparation of PE layer Examples Preparation of PE layer
Example 1 Preparation example 12 Example 8 Preparation example 19
Example 2 Preparation example 13 Example 9 Preparation example 20
Example 3 Preparation example 14 Example 10 Preparation example 21
Example 4 Preparation example 15 Example 11 Preparation example 22
Example 5 Preparation example 16 Example 12 Preparation example 23
Example 6 Preparation example 17 Example 13 Preparation example 24
Example 7 Preparation example 18 Example 14 Preparation example 21
Example 14: a dry-laminated paper-plastic zipper pack was produced in the same manner as in example 10 except that the heat-sealing temperature was 150 ℃ and the pressure was 25N for 0.5 s.
Example 15: a dry-coated paper-plastic zipper pack, which is different from example 10 in that the first adhesive layer and the second adhesive layer were replaced with a two-component solvent-based polyurethane adhesive, model LA2880, selected from shoal, japanese commercial ltd.
Comparative example
Comparative example 1: a dry composite paper-plastic zipper packaging bag is different from the embodiment 1 in that the dosage of LDPE is 10kg, and the dosage of HDPE is 90 kg.
Comparative example 2: a dry-laminated paper-plastic zipper pack, which is different from example 1 in that LDPE is not added.
Comparative example 3: a dry-coated paper-plastic zipper pack, which is different from example 1 in that no HDPE was added.
Comparative example 4: a dry-coated paper-plastic zipper pack, which is different from example 1 in that no polyamide fiber was added.
Comparative example 5: a dry-coated paper-plastic zipper pack, which is different from example 1 in that polyamide fiber and HDPE were not added.
Comparative example 6: a dry-coated paper-plastic zipper pack, which is different from example 1 in that the heat-sealing temperature of the zipper in step S4 is 180 ℃.
Comparative example 7: a dry-coated paper-plastic zipper pack, which is different from example 1 in that the heat-sealing temperature of the zipper in step S4 was 105 ℃.
Comparative example 8: the utility model provides a wrapping bag is moulded to paper, includes paper substrate layer, air barrier layer and thermoplastic resin layer, coats polyvinyl alcohol aqueous solution in paper substrate layer, obtains air barrier layer (being PVA membrane) after only drying process, air barrier layer and thermoplasticThe performance resin layer is combined into an integral laminated film by a dry laminating forming method or an extrusion laminating method, and the polyvinyl alcohol aqueous solution contains polyvinyl alcohol, cellulose nanofiber, a surface tension regulator, an auxiliary agent and deionized water. Specifically, a polyvinyl alcohol aqueous solution with a solid content of 4% is adopted, the saponification degree is 98%, and the mass ratio of polyvinyl alcohol to cellulose nanofiber is 1: 1; the diameter of the cellulose nanofiber is preferably 1000nm, the surface tension regulator is a polyether silicone compound, the mass percentage of the surface tension regulator in the polyvinyl alcohol aqueous solution is 0.04%, the auxiliary agent comprises an emulsifier and a defoaming agent, and the mass percentage of the auxiliary agent in the polyvinyl alcohol aqueous solution is 1%. The thickness of the air barrier layer is preferably controlled to be 100nm, the thermoplastic resin layer is preferably polyethylene resin, for example, LDPE can be used, and the density of LDPE is controlled to be 900kg to 950kg/m3The thickness of the LDPE resin layer is not less than 25 μm.
Performance test
The packaging bags were prepared in the same manner as in examples and comparative examples, and with reference to the test method in T/BZ1331-2020 multilayer composite Plastic film, bags, the heat-sealing condition of the zipper was observed and the peel force (N/15mm) between the zipper and the PE layer, the breaking force (N) of the packaging bag, and the oxygen gas permeation amount [ cm ] were measured3/(m2·24h·0.1MPa)]And water vapor transmission amount [ g/(m)2·24h)](ii) a Measuring the contact angle (°) of the PE layer by a sessile drop method using a water contact angle determinator (XG-CAM, shanghai pitot innovative analysis), measuring at 25 ℃ and a relative humidity of 40-50%, taking 3 points for each sample, and obtaining the average contact angle of the PE layer by taking an average value; sweet corns are filled in the packaging bags prepared in the examples and the comparative examples, the packaging bags are sterilized at 120 ℃, then are placed in a natural environment, after the packaging bags are placed for 50 days, the deterioration rate (%) of the inner corns is observed, the testing amount of each example or comparative example is 50, the ultraviolet resistance of the packaging bags is measured according to the deterioration rate, the higher the deterioration rate is, the worse the ultraviolet resistance is, and the detection results are recorded in a table 5.
TABLE 5 results of testing the performance of the bags
Figure BDA0003372861990000091
Figure BDA0003372861990000101
Figure BDA0003372861990000111
It is understood from the data in examples 1-2 and Table 5 that dicumyl peroxide and bis (t-butylperoxy) diisopropylbenzene at a mass ratio of 1:0.5 are used as a crosslinking agent to improve the peeling force after heat sealing of the PE layer and the zipper and to improve the heat sealing quality of the PE layer, so that the zipper is smooth, wrinkle-free and well sealed, while example 3, in which only dicumyl peroxide is used as a crosslinking agent, has a lower peeling force between the zipper and the PE layer and wrinkles and unevenness appear at the zipper, but has good sealing property, compared with example 1; in addition, the packaging bag has good barrier property to oxygen and water vapor, and the PE layer has good hydrophobicity.
In examples 4-5, different ratios of HDPE and LDPE were used, and compared to example 1, the bags made in examples 4 and 5 had smooth zipper, no wrinkles, good sealing, and high peel force from the PE layer.
In example 6, HDPE and LDPE having different melt indices and densities than those of example 1 were used, and the zipper of the bag made in example 6 was smooth, good in sealability and free of delamination.
Example 7 is different from example 1 in that the polyamide fiber prepared in preparation example 5 of the present application is used in the PE layer, the breaking force of the packaging bag prepared in example 7 is enhanced, the contact angle between the PE layer and water is 93.8 °, the hydrophobicity is enhanced, the transmission amount of oxygen and water vapor in the packaging bag is reduced, the barrier property is improved, and the deterioration rate of the corn stored in the packaging bag is 20% after the packaging bag is placed in a natural environment for 50 days, and the packaging bag has a good ultraviolet resistance.
Example 8 compared with example 1, the polyamide fiber prepared in preparation example 6 was used in the PE layer, and since the mixed fiber was not subjected to carbon tetrafluoride plasma cleaning, the data in table 5 shows that the wrapping bag prepared in example 8 has a contact angle of the PE layer with water of 88.4%, and after being left in a natural environment for 50 days, the deterioration rate of the stored corn was 44%, and the water vapor and oxygen transmission amount was lower than that of example 1, but greater than that of example 7, indicating that the contact angle of the PE film with water was improved, the hydrophobicity was improved, and the barrier property and the ultraviolet ray resistance were improved by the carbon tetrafluoride plasma cleaning.
The PE layer of the packaging bag in example 9 is made of the polyamide fiber prepared in preparation example 7, compared with example 7, polytetrafluoroethylene is not evaporated at high temperature, the corn stored in the packaging bag prepared in example 9 in natural environment has a deterioration rate of 44%, the transmission amount of water vapor and oxygen is increased, the ultraviolet resistance and barrier property are reduced, in addition, the contact angle of the PE layer and water is reduced, the hydrophobicity is reduced, the breaking force is reduced, and the mechanical property is reduced.
Example 10 is different from example 7 in that the polyamide fiber manufactured in preparation example 8 was used in the PE layer, wherein modified montmorillonite was manufactured in preparation example 1, and the data in table 5 shows that the contact angle of the PE layer with water in the packaging bag was increased to 94.5%, the oxygen and water vapor transmission amount was smaller than that in example 7, and the deterioration rate of the corn stored in the packaging bag was 8% after the corn was left in the natural environment for 50 days, whereby it can be seen that the addition of modified montmorillonite improves the hydrophobicity of the PE layer and the uv resistance and barrier property of the packaging bag.
In the packaging bag manufactured in example 11, the polyamide fiber manufactured in preparation example 9 was used for the PE layer, the modified montmorillonite was manufactured in preparation example 2, and compared with example 10, the packaging bag manufactured in example 11 had an increased oxygen and water vapor transmission amount, and a corn deterioration rate stored in the packaging bag was 16%, which indicates that the addition of the functionalized graphene oxide can enhance the effect of the modified montmorillonite on the barrier property and the ultraviolet resistance of the PE layer.
Example 12 compared to example 10, the modified montmorillonite used was prepared from preparation example 3, wherein isophorone diisocyanate was not added, and the permeability of the packaging bag to oxygen and water vapor was significantly increased, indicating that the graphene oxide treated with isophorone diisocyanate improves the barrier properties of the packaging bag to oxygen and water vapor, thereby extending the shelf life.
Example 13 compared with example 10, the PE layer used the polyamide fiber made in preparation example 11, wherein the modified nanomontmorillonite was made in preparation example 4, and because octadecyl dimethyl ammonium chloride was not added, the packaging bag had an increased amount of water vapor transmission and a lower contact angle between the PE layer and water compared to example 10, indicating that octadecyl dimethyl ammonium chloride can increase the hydrophobicity of the PE layer and increase the barrier properties of the packaging bag.
Example 14 compared to example 10, the PE layer from preparation 21 was used, the heat sealing temperature and pressure and the heat sealing time were varied, and the data in table 5 shows that the bag from example 14 was smooth, free of delamination, free of wrinkles, good in sealing, and excellent in hydrophobicity, barrier properties and uv resistance.
Example 15 compared to example 10, where both the first and second adhesive layers were a two-part solvent-borne polyurethane adhesive, the data in table 5 shows that the heat seal at the zipper was uneven and the peel force was reduced.
The difference between the comparative example 1 and the example 1 is that when the amount of LDPE is reduced and the amount of HDPE is increased, wrinkles appear at the zipper position when the PE layer and the zipper are heat-sealed, the heat seal is not smooth, the heat seal is not tight, and the zipper and the PE layer are easy to tear.
In comparison with example 1, comparative examples 2 and 3 were compared with example 1 without adding LDPE and HDPE, and it can be seen from the contents in Table 5 that the bags made in comparative examples 2 and 3 had many wrinkles at the zipper, and were not flat and insufficient in sealability.
Comparative example 4 in which no polyamide fiber was added, the breaking force of the packaging bag made in comparative example 4 was reduced as compared with example 1, wrinkles and unevenness were formed in the zipper after heat-sealing, the peel force between the zipper and the PE layer was also smaller than that of example 1, and the barrier property against oxygen and water vapor of the packaging bag was also reduced.
Comparative example 5 compared to example 1, without the addition of polyamide fiber and HDPE, the packaging bag made in comparative example 5 has a significantly increased oxygen and water vapor transmission compared to comparative examples 3 and 4, indicating that polyamide fiber and HDPE synergistically improve the barrier properties of the PE layer.
Comparative example 6 and comparative example 7 increased and decreased the heat-sealing temperature, respectively, and the heat-sealed portion of the slide fastener was wrinkled, uneven, and inferior in sealability, as compared with example 1.
Comparative example 8 a packaging bag having an inner layer of thermoplastic resin, preferably polyethylene resin, prepared according to the prior art, which was heat-sealed to a zipper, had wrinkles at the heat-sealed portion of the zipper, was not flat and poor in sealability, and further, the packaging bag had insufficient barrier properties against oxygen and water vapor, and the inner layer was not as hydrophobic as in example 1.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.

Claims (10)

1. A dry-compound paper-plastic zipper packaging bag is characterized by comprising a bag body and a zipper arranged on the bag body, wherein the bag body is made of a composite film;
the composite film sequentially comprises a BOPP layer, a first bonding layer, a kraft layer, a second bonding layer, a PET layer, a third bonding layer and a PE layer from outside to inside;
the PE layer is prepared from the following raw materials in parts by weight: 20 to 50 portions of the rubber have a melt index of 0.23 to 0.43g/10min and a density of 0.92 to 0.924g/cm350 to 80 portions of LDPE with the melt index of 0.75 to 0.9g/10min and the density of 0.923 to 0.961g/cm315-20 parts of polyamide fiber, 3-6 parts of a cross-linking agent and 1-3 parts of an antioxidant.
2. The dry-coated paper plastic zipper packaging bag according to claim 1, wherein: the cross-linking agent comprises dicumyl peroxide and bis (tert-butylperoxy) diisopropylbenzene in a mass ratio of 1: 0-0.5.
3. The dry-coated paper plastic zipper packaging bag according to claim 1, wherein: the preparation method of the PE layer comprises the following steps: blending HDPE, LDPE, polyamide fiber and antioxidant, melting at 140-150 ℃, adding a cross-linking agent, mixing at 140-150 ℃ for 1-3min, extruding, blowing and cooling.
4. The packaging bag of claim 1, wherein the polyamide fiber comprises the following raw materials in parts by weight: 7-9 parts of polyamide 66, 3-5 parts of modified nano montmorillonite, 10-20 parts of polyvinyl chloride and 5-10 parts of nano polytetrafluoroethylene.
5. The dry-coated paper plastic zipper packaging bag according to claim 4, wherein the polyamide fiber is prepared by the following method:
drying polyamide 66, mixing with the modified nano montmorillonite uniformly, heating to a molten state, and spinning to form polyamide 66 fibers;
pulverizing the prepared polyamide 66 fiber to nanometer level, adding polyvinyl chloride, plasticizer and lubricant, heating to 160-200 deg.C, spinning, stretching and shaping to obtain mixed fiber;
plasma cleaning the mixed fiber with carbon tetrafluoride for 3-5min, immediately placing into a closed space containing nano polytetrafluoroethylene, and vacuumizing to (5-5.5) × 10-3Heating to the temperature of 360-380 ℃ under the MPa, preserving the heat for 5-10min, and cooling to the room temperature to obtain the polyamide fiber.
6. The dry-composite paper plastic zipper packaging bag according to claim 4, wherein the preparation method of the modified nano-montmorillonite comprises the following steps:
mixing 2-5 parts of nano montmorillonite and 5-10 parts of deionized water by weight to prepare suspension, and adjusting the pH value to 1-2;
(2) placing 1-2 parts of nano graphene oxide in 5-10 parts of N, N-dimethylformamide, performing ultrasonic treatment for 10-20min, adding 10-20 parts of isophorone diisocyanate, stirring for 20-24h under the protection of nitrogen, washing with dichloromethane, and performing freeze drying to obtain functionalized graphene oxide;
(3) and (3) adding 0.5-1 part of dioctadecyl dimethyl ammonium chloride and the functionalized graphene oxide prepared in the step (2) into the product obtained in the step (1), uniformly stirring at 80-100 ℃, filtering, washing with deionized water, and drying.
7. The dry-coated paper plastic zipper packaging bag according to claim 5, wherein the heat setting method comprises the following steps: soaking the spinning product in water at 90-100 deg.C for 20-30 min.
8. The dry-coated paper-plastic zipper packaging bag according to claim 1, wherein the first and second adhesive layers are single-component polyurethane adhesives, and the third adhesive layer is a two-component polyurethane adhesive.
9. The method for preparing a dry-coated paper-plastic zipper packaging bag according to any one of claims 1 to 8, comprising the steps of:
s1, brushing a single-component polyurethane adhesive on two sides of kraft paper to obtain a first bonding layer and a second bonding layer;
s2, printing the BOPP film, compounding the BOPP film with the first bonding layer, compounding the PET film with the second bonding layer, and curing;
s3, brushing a bi-component polyurethane adhesive on one side of the PET film far away from the second adhesive layer to form a third adhesive layer, compounding the PE film on the third adhesive layer, curing, and slitting to form a composite film;
s4, folding the composite film, placing the PE zipper between the PE layers, and heat-sealing for 0.5-1S at the temperature of 120-150 ℃ and under the condition of 25-35N to obtain the dry-compound paper plastic zipper packaging bag.
10. The method for preparing a dry-coated paper-plastic zipper packaging bag according to claim 9, wherein the sizing amount of the one-component polyurethane glue adhesive on both sides of the kraft paper is 3.8-4g/m2Curing for 20-24h at 50-80 deg.C;
the gluing amount of the bi-component polyurethane adhesive PET film is 1.3-1.5g/m2Curing for 30-36h at the temperature of40-50℃。
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