CN115352148A - Separable packaging material, preparation method thereof and packaging container - Google Patents

Separable packaging material, preparation method thereof and packaging container Download PDF

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Publication number
CN115352148A
CN115352148A CN202211264012.6A CN202211264012A CN115352148A CN 115352148 A CN115352148 A CN 115352148A CN 202211264012 A CN202211264012 A CN 202211264012A CN 115352148 A CN115352148 A CN 115352148A
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China
Prior art keywords
mass
parts
aluminum foil
poly
barrier layer
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CN202211264012.6A
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CN115352148B (en
Inventor
孙忠杰
宋夫前
童亚君
张历灵
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Ningbo Times Aluminium Foil Technology Corp ltd
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Ningbo Times Aluminium Foil Technology Corp ltd
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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
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/20—Layered products comprising a layer of metal comprising aluminium or copper
    • 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
    • B29D7/00—Producing flat articles, e.g. films or sheets
    • B29D7/01—Films or sheets
    • 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
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/08—Layered products comprising a layer of metal comprising metal 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
    • B32B15/082—Layered products comprising a layer of metal comprising metal 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 comprising vinyl resins; comprising acrylic resins
    • 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
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/08—Layered products comprising a layer of metal comprising metal 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
    • B32B15/09—Layered products comprising a layer of metal comprising metal 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 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
    • 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
    • B32B27/306—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl acetate or vinyl alcohol (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
    • 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
    • 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
    • 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
    • B32B7/06—Interconnection of layers permitting easy separation
    • 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
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/18—Manufacture of films or sheets
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
    • C09D175/04—Polyurethanes
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/60—Additives non-macromolecular
    • C09D7/61—Additives non-macromolecular inorganic
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
    • C09J11/08—Macromolecular additives
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J139/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a single or double bond to nitrogen or by a heterocyclic ring containing nitrogen; Adhesives based on derivatives of such polymers
    • C09J139/04—Homopolymers or copolymers of monomers containing heterocyclic rings having nitrogen as ring member
    • C09J139/06—Homopolymers or copolymers of N-vinyl-pyrrolidones
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2255/00—Coating on the layer surface
    • B32B2255/06—Coating on the layer surface on metal layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2255/00—Coating on the layer surface
    • B32B2255/26—Polymeric coating
    • 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
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/558—Impact strength, toughness
    • 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
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/582—Tearability
    • B32B2307/5825—Tear resistant
    • 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
    • B32B2307/716—Degradable
    • B32B2307/7163—Biodegradable
    • 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
    • B32B2307/746—Slipping, anti-blocking, low friction
    • 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
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2329/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal, or ketal radical; Hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Derivatives of such polymer
    • C08J2329/02—Homopolymers or copolymers of unsaturated alcohols
    • C08J2329/04—Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2467/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
    • C08J2467/04—Polyesters derived from hydroxy carboxylic acids, e.g. lactones
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/20—Oxides; Hydroxides
    • C08K3/22—Oxides; Hydroxides of metals
    • C08K2003/2237—Oxides; Hydroxides of metals of titanium
    • C08K2003/2241—Titanium dioxide
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K2201/00—Specific properties of additives
    • C08K2201/011—Nanostructured additives
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W90/00—Enabling technologies or technologies with a potential or indirect contribution to greenhouse gas [GHG] emissions mitigation
    • Y02W90/10—Bio-packaging, e.g. packing containers made from renewable resources or bio-plastics

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  • Materials Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
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  • Inorganic Chemistry (AREA)
  • Health & Medical Sciences (AREA)
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Abstract

The invention provides a separable packaging material, a preparation method thereof and a packaging container. The preparation method of the separable packaging material of the present invention comprises: coating bonding slurry on the first surface of the aluminum foil layer, and laying a barrier layer on the bonding slurry; and coating the heat-seal paste on the second surface of the aluminum foil layer and drying to obtain the separable packaging material. In the recycling of the separable packaging material of the present invention, the aluminum foil layer and the barrier layer are separated from each other by dissolving the adhesive slurry. Therefore, the aluminum foil packaging material is convenient to recycle.

Description

Separable packaging material, method for producing same, and packaging container
Technical Field
The invention relates to the technical field of packaging materials, in particular to a separable packaging material, a preparation method thereof and a packaging container.
Background
The packaging material can facilitate the transportation and easy storage of goods in the production process, and is widely applied to daily life and industrial production. However, most of the existing packaging materials are made of PE and PP materials, are difficult to recycle and are easy to pollute the environment. In order to protect the environment, those skilled in the art have made many studies and improvements on packaging materials.
For example, chinese patent application with publication number CN111572983B discloses a high-strength degradable paper-plastic composite bag, adopt microcrystalline cellulose modified soy protein to prepare adhesive base material, form effective entanglement with the paper surface, the bonding strength between adhesive material and paper layer is improved, coat the binder to paper layer surface again, it is not high to improve paper layer structural strength, the relatively poor defect of mechanical properties, through the paper layer that adopts, what tie coat and plastic layer all adopted is degradable material, in the in-service use process, can be degraded by biological effect, safety green.
For another example, chinese patent application with publication No. CN112849777B discloses a naturally fully degradable packaging bag, which comprises a bag body made of double-layer fabric: the bag body is made by adopting PLA biodegradable plastic materials as base materials through PLA spinning, thin non-woven fabric manufacturing, non-woven fabric laminating, printing, bag making and cotton filling; PLA is a biodegradable plastic material, can be continuously regenerated, and is green and environment-friendly.
As can be seen from the above examples, degradable packaging materials are the direction of improvement which is currently being intensively studied by those skilled in the art. However, in addition to the above-mentioned direction of improvement, it is also important and not negligible how to increase the recyclability of the packaging material.
In particular, an aluminum foil material is often used as a packaging material, and is difficult to decompose in a natural environment and is not low in cost, and therefore, it is necessary to recycle the aluminum foil material. However, in the aluminum foil packaging material, the inner and outer surfaces of the aluminum foil are generally covered with other materials, and the aluminum foil is difficult to be peeled from the materials, which makes recycling of the aluminum foil difficult.
Therefore, how to provide an aluminum foil packaging material convenient for recycling aluminum foil is a technical problem to be solved by those skilled in the art.
Disclosure of Invention
The invention aims to provide a separable packaging material, a preparation method thereof and a packaging container, so as to provide a recyclable green aluminum foil packaging material. In order to solve the above-mentioned technical problems, the present invention has been achieved as described above.
The invention provides a preparation method of a separable packaging material, which comprises the following steps:
s10: coating bonding slurry on the first surface of the aluminum foil layer, and laying a barrier layer on the bonding slurry;
s20: coating heat-sealing slurry on the second surface of the aluminum foil layer and drying to obtain a separable packaging material;
wherein the bonding slurry is prepared by the following steps:
s31: weighing 45-55 parts by mass of vinyl pyrrolidone and 10-55 parts by mass of acrylamide, placing the mixture in 300-400 parts by mass of water, heating the mixture to 60-65 ℃ in an inert gas environment, stirring the mixture for 2-3 hours, adding 0.1-0.3 part by mass of an initiator in the stirring process, washing and drying the mixture to obtain a first polymer;
s32: dissolving 40-80 parts by mass of a first polymer, 8-10 parts by mass of sodium polyacrylate and 2-5 parts by mass of sodium hydroxide in 300-350 parts by mass of water, and ultrasonically mixing to prepare bonding slurry;
the barrier layer comprises a base material, a connecting material and an antibacterial material, wherein the base material comprises poly d-lactic acid, poly L-lactic acid and polyvinyl alcohol, the connecting material comprises maleic anhydride grafted compatilizer, the antibacterial material comprises titanium dioxide antibacterial agent, and the poly d-lactic acid: poly-L-lactic acid: polyvinyl alcohol: maleic anhydride graft compatibilizer: the mass part ratio of the titanium dioxide antibacterial agent is (20-50): (20-50): (30-60): (20-30): (1-5);
the heat-sealing sizing agent comprises the following components in parts by mass (8-15): (28-30): (0.5-0.8): (350-400): (50-80) polyvinyl chloride-propionate copolymer, modified waterborne polyurethane, titanium dioxide, ethyl acetate and butyl acetate.
Further, in S31, the initiator includes: at least one of azobisisoheptonitrile, azobisisobutyronitrile and dimethyl azobisisobutyrate.
Further, the barrier layer further comprises calcium stearate, lignin, starch, oxidized polyethylene wax and erucamide.
Further, the barrier layer is prepared by the steps of:
s41: weighing poly d-lactic acid, poly L-lactic acid, polyvinyl alcohol, maleic anhydride graft compatilizer, titanium dioxide antibacterial agent, calcium stearate, lignin, starch, oxidized polyethylene wax and erucamide, and uniformly stirring at 100-120 ℃ to obtain a first mixture;
s42: heating the first mixture to 150-160 ℃, carrying out extrusion forming, and granulating to prepare a second mixture;
s43: and extruding the second mixture at 170-190 ℃ to form a film, thus obtaining the barrier layer.
Further, in S41, the weight ratio of 30:30:50:20:3:16:8:8:3:3 poly d-lactic acid, poly L-lactic acid, polyvinyl alcohol, maleic anhydride grafting compatilizer, titanium dioxide antibacterial agent, calcium stearate, lignin, starch, oxidized polyethylene wax and erucamide.
Further, the thickness of the barrier layer is 5um to 20um.
Further, in S20, the thickness of the heat-seal paste applied over the second surface of the aluminum foil layer is 1um to 10um.
Further, in S31, 50 parts by mass of vinylpyrrolidone and 20 to 30 parts by mass of acrylamide are weighed and placed in 320 parts by mass of water; in S10, the bonding paste applied over the first surface of the aluminum foil layer has a thickness of 2um to 10um.
Further, in the above preparation method, the aluminum foil layer is formed by rolling an aluminum alloy material including, in parts by mass, a mixture of (97.8-98.2): (0.4-0.6): (0.4-0.6) aluminum, iron and nickel, and the thickness of the aluminum foil layer is 50um to 20um.
The separable packaging material provided by the invention has the following beneficial effects: the invention provides a preparation method of a separable packaging material, wherein an aluminum foil layer and a barrier layer are connected by adopting bonding slurry, and the bonding slurry can be dissolved in hot water, so that the aluminum foil layer is separated from the barrier layer, and further the aluminum foil layer is recycled. On the other hand, the barrier layer of the invention adopts polylactic acid material, is renewable plant resource, can be biodegraded, and is green and environment-friendly. In addition, the aluminum foil layer of the separable packaging material is a reinforced aluminum foil material, has good toughness and is not easy to tear.
The invention also provides a separable packaging material, which is obtained by adopting the preparation method of any one of the technical schemes.
The separable packaging material is obtained by adopting the preparation method of any one of the technical schemes, so that the separable packaging material has all the beneficial effects of the preparation method of any one of the technical schemes, and the details are not repeated.
The invention provides a packaging container which is prepared from the aluminum foil packaging material in any technical scheme.
The packaging container of the present invention is prepared by using the aluminum foil packaging material according to any one of the above technical solutions, so that the packaging container has all the beneficial effects of the aluminum foil packaging material according to any one of the above technical solutions, and details are not repeated herein.
Drawings
FIG. 1 is a schematic view of a packaging container according to an embodiment of the present invention;
fig. 2 is a detailed layer structure of the separable packaging material of fig. 1.
Detailed Description
The following examples are illustrative only and are not to be construed as limiting the invention. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
The embodiment of the invention provides a preparation method of a separable packaging material, which comprises the following steps:
s10: coating bonding slurry on the first surface of the aluminum foil layer, and laying a barrier layer on the bonding slurry;
s20: and coating the heat-seal paste on the second surface of the aluminum foil layer and drying to obtain the separable packaging material.
In the above embodiments, the separable packaging material is mainly used for packaging of food, medicine, drink, and electronic component products. The product comprises an aluminum foil layer and a blocking layer, wherein the aluminum foil layer has good plasticity and grease permeation resistance and has good glossiness, but the aluminum foil is easy to tear, so that the blocking layer is arranged on one side of the first surface of the aluminum foil layer to improve the strength of the surface of the aluminum foil material.
Because the connectivity between aluminium foil layer and the barrier layer is relatively poor, the aluminium foil layer and the barrier layer compounded through the common rolling process are very easy to separate in the use process, and therefore, a bonding agent needs to be coated between the aluminium foil layer and the barrier layer to strengthen the connection between the aluminium foil layer and the barrier layer. Wherein, the adhesive is usually a macromolecular resin adhesive material, and has good adhesive effect and lasting adhesive effect. However, when the packaging material is recycled at a later stage, the aluminum foil layer and the barrier layer need to be recycled separately, which requires the adhesive to be easily separated, and the design of the adhesive in the prior art mainly considers how to improve the bonding strength of the adhesive. Therefore, embodiments of the present invention provide a method for preparing an adhesive (i.e., the above adhesive paste) that is easy to separate, and a packaging material using the adhesive paste can achieve rapid separation of an aluminum foil layer and a barrier layer in an aqueous solution at 90 ℃ or higher. The preparation steps of the bonding slurry are as follows:
s31: putting 300-400 parts by mass of deionized water into a reaction kettle provided with a return pipe, adding 45-55 parts by mass of vinyl pyrrolidone and 10-55 parts by mass of acrylamide to dissolve, heating the reaction kettle to 60-65 ℃ in a nitrogen environment, adding 0.1-0.3 part by mass of an initiator while stirring, reacting for 2-3 h, washing and drying a product to obtain a first polymer;
s32: dissolving 40-80 parts by mass of first polymer, 8-10 parts by mass of sodium polyacrylate and 2-5 parts by mass of sodium hydroxide in 300-350 parts by mass of water, performing ultrasonic treatment for 10-20 minutes, and standing for 1-2 hours to prepare the bonding slurry.
In the bonding paste, the first polymer is a copolymer of vinyl pyrrolidone and acrylamide, and the acrylamide contains carbon-carbon double bonds and amide groups, is easy to polymerize and has thickening and dispersing properties, so that the first polymer is mainly used for providing bonding force when the bonding paste is connected. The sodium polyacrylate is a linear and soluble high-molecular compound, the carboxyl on the sodium polyacrylate can enable the polymeric chain in the first polymer to be stretched out under the action of electrostatic repulsion, and the sodium polyacrylate has better swelling performance and can retain a large amount of liquid substances, so that the bonding effect of the bonding slurry is ensured. The sodium hydroxide can improve the efficiency of the reaction and enable the reaction to be carried out under a proper environment. The first polymer has good solubility and biocompatibility, can react under the condition of aqueous solution, reduces the preparation cost, and is more environment-friendly. When the packaging material is recycled, the packaging material is placed in a high-temperature aqueous solution, the first polymer in the bonding slurry is heated, dispersed and dissolved, the bonding force of the bonding slurry is reduced, and the aluminum foil layer and the barrier layer are effectively separated.
The bonding paste is coated on the first surface of the aluminum foil layer, wherein the coating mode comprises manual coating and mechanical coating. When the adhesive slurry is applied to the aluminum foil layer, the adhesive slurry is in a fluid state, a semi-solidified state, or a gel state, and the barrier layer needs to be laid before the adhesive slurry is solidified. The bonding slurry mainly has the functions of connecting the aluminum foil layer and the barrier layer at normal temperature, is easy to decompose at high temperature and is convenient for separating the aluminum foil layer from the barrier layer.
Preferably, the bonding paste coated on the aluminum foil layer is in a gel state, and the bonding paste in the gel state has strong bonding force, so that coating and laying of the barrier layer are facilitated.
Preferably, in S10, the thickness of the bonding paste is 2um to 10um, and the thickness of the bonding paste has a relationship with the adhesive force of the bonding paste, and in general, the thicker the thickness of the bonding paste, the stronger the adhesive force of the bonding paste. And the bonding paste with the thickness of 3um can ensure that the thickness of the separable packaging material reaches the minimum under the condition of ensuring the bonding force.
Preferably, in S31, 50 parts by mass of vinylpyrrolidone and 20 to 30 parts by mass of acrylamide are weighed and placed in 320 parts by mass of water, and increasing the mass of vinylpyrrolidone can increase the chain length of the first polymer.
Preferably, in S31, 50 parts by mass of vinylpyrrolidone and 25 parts by mass of acrylamide are weighed and placed in 320 parts by mass of water.
In the preparation step of S10, an initiator is also used, and the initiator is a substance capable of initiating a polymerization reaction of the monomer, and can accelerate the generation efficiency of the polymer. In an embodiment of the invention, the initiator comprises: at least one of azobisisoheptonitrile, azobisisobutyronitrile, dimethyl azobisisobutyrate, azobisisobutyramidine hydrochloride, azobisisobutyrimidazoline hydrochloride, azobisisobutyro-cyanoformamide, dicyclohexyl peroxydicarbonate, diisopropyl peroxydicarbonate, benzoyl peroxide and lauroyl peroxide.
Wherein, azodiisoheptanonitrile, azodiisobutyronitrile, dimethyl azodiisobutyrate, azodiisobutyl amidine hydrochloride, azodiisobutyl imidazoline hydrochloride and azoisobutyryl cyano formamide are used as azo initiators. Azo initiators belong to low-activity initiators, and azodiisobutyronitrile is generally selected as an initiator in polymerization reaction, but the initiation rate of the azodiisobutyronitrile is low. In order to improve the reaction efficiency of the polymerization reaction, azodiisoheptonitrile with high activity and high initiation efficiency is selected as an initiator. In order to further control the polymerization reaction, dimethyl azodiisobutyrate is selected as an initiator, the initiation activity of the dimethyl azodiisobutyrate is moderate, the polymerization reaction is easy to control, no residue is generated in the polymerization process, the product conversion rate is high, the decomposition product is harmless, and the dimethyl azodiisobutyrate can be perfectly substituted. In the absence of materials, azobisisobutyramidine hydrochloride, azobisisobutyrimidazoline hydrochloride, and azobisisobutyronitrile formamide may also be used as initiators.
Preferably, the initiator is one of azobisisoheptonitrile, azobisisobutyronitrile and dimethyl azobisisobutyrate.
The barrier layer in the embodiment of the invention mainly has the functions of improving the strength of the separable packaging material and ensuring the integrity of the aluminum foil layer. The barrier layer comprises a base material, a connecting material and an antibacterial material. The base material is the main component in the barrier layer and comprises poly-d-lactic acid, poly-L-lactic acid and polyvinyl alcohol. The poly-d-lactic acid and the poly-L-lactic acid are two different stereo-iso structures of the polylactic acid, the polylactic acid has good thermal stability, the polylactic acid is a biodegradable material, the biodegradation can be realized only by burying the polylactic acid material in soil, and after the poly-d-lactic acid and the poly-L-lactic acid are selected as base materials and blended, a stereo-crystal effect is formed between the poly-d-lactic acid and the poly-L-lactic acid, so that the strength of the barrier material can be improved. Copolymer can be generated between polylactic acid and polyvinyl alcohol, so that the defect that the polylactic acid is fragile and easy to break is improved.
The linking material includes a maleic anhydride grafted compatibilizer. However, the maleic anhydride graft compatibilizer can be replaced with an acrylic acid graft compatibilizer, or an oxazoline graft compatibilizer. The connecting material can strengthen the connection among the components of the base material, reduce the surface tension among different polymers and improve the thermal stability. The acrylic acid grafted compatilizer can improve the compatibility of polylactic acid and polyvinyl alcohol, so that the bond between the polylactic acid and the polyvinyl alcohol can be enhanced, and the mechanical property of the matrix material is further enhanced. The maleic anhydride grafted compatilizer is a polymer interface coupling agent, a compatilizer and a dispersion promoter, and the material has high polarity and reactivity by introducing a strong polar reactive group. The oxazoline grafted compatilizer has wide application range, not only can react with general polymers containing amino or carboxyl, but also can react with polymers containing carbonyl, anhydride and epoxy groups to generate a grafted copolymer.
Since the barrier layer is generally disposed on the outside of the separable packaging material, the barrier layer needs to have a certain antibacterial ability to prevent bacteria from staying and propagating on the surface of the package. In the embodiment of the invention, the titanium dioxide antibacterial agent is added into the barrier layer to achieve the antibacterial effect, and nano titanium dioxide particles or nano titanium dioxide fibers are selected as the titanium dioxide antibacterial agent.
The sterilization principle of titanium dioxide lies in its quantum size effect, although titanium dioxide powder with non-nano size also has photocatalysisThe antibacterial material can also generate electron and hole pairs, but the time for the electron and hole pairs to reach the surface of the material is above microsecond level, so that the recombination is easy to occur, and the antibacterial effect is difficult to exert. The nano-scale titanium dioxide is obtained, the photo-excited electrons and holes migrate from the inside of the body to the surface within the time of nanosecond, picosecond or even femtosecond, and the composition of the photo-generated electrons and the holes is in the nanosecond level, so that the photo-excited electrons and the holes can quickly migrate to the surface to attack the bacterial organisms and play a corresponding antibacterial role. Nano titanium dioxide in H 2 O、O 2 The system has photocatalytic reaction, and the produced hydroxyl radical can react with various bacteria and bad smell to sterilize and eliminate bad smell effectively.
Preferably, the poly d-lactic acid: poly-L-lactic acid: polyvinyl alcohol: maleic anhydride graft compatibilizer: the titanium dioxide antibacterial agent comprises (20-50) by mass: (20-50): (30-60): (20-30): (1-5).
Further included in the barrier layer is: calcium stearate, lignin, starch, oxidized polyethylene wax and erucamide. The calcium stearate and the oxidized polyethylene wax can further enhance the compatibility of the base material and the mechanical property of the packaging material. The addition of lignin and starch can reduce the use of matrix materials on the premise of barrier layer performance. The addition of erucamide can reduce the friction between the base materials, so that the surface of the barrier layer is smoother and more beautiful.
The specific preparation steps of the barrier layer in the embodiment of the invention are as follows:
s41: weighing and mixing 20-50 parts by mass of poly d-lactic acid, 20-50 parts by mass of poly L-lactic acid, 30-60 parts by mass of polyvinyl alcohol, 20-30 parts by mass of maleic anhydride grafted compatilizer, 2-5 parts by mass of titanium dioxide antibacterial agent, 15-20 parts by mass of calcium stearate, 5-10 parts by mass of lignin, 5-10 parts by mass of starch, 3-5 parts by mass of oxidized polyethylene wax and 3-5 parts by mass of erucamide, adding into a high-speed mixer, and uniformly stirring at 100-120 ℃ to obtain a first mixture;
s42: adding the first mixture into a double-screw extruder, wherein the processing temperature of the double-screw extruder is 150-160 ℃, the rotating speed of a screw is 180rpm, and granulating to obtain a second mixture;
s43: and extruding the second mixture into a film at the temperature of 170-190 ℃ to obtain the barrier layer.
Wherein, the thickness of the prepared barrier layer is 5um to 20um, preferably 7um to 8 um.
Preferably, in S41, 30 parts by mass of poly d-lactic acid, 30 parts by mass of poly L-lactic acid, 50 parts by mass of polyvinyl alcohol, 20 parts by mass of maleic anhydride graft compatibilizer, 3 parts by mass of nano titanium dioxide particles, 16 parts by mass of calcium stearate, 8 parts by mass of lignin, 8 parts by mass of starch, 3 parts by mass of oxidized polyethylene wax, and 3 parts by mass of erucamide are weighed, and the barrier layer in this ratio can still have good strength and toughness in the case of a thin thickness.
In the above steps, nano titanium dioxide particles are generally used as the antibacterial material, but in actual production, the titanium dioxide particles are easy to agglomerate when being mixed with the base material, so that the antibacterial performance of the prepared barrier layer is weakened, and the toughness of the barrier layer is reduced. Therefore, in the embodiment of the present invention, the nano titanium dioxide fiber is used as the antibacterial material to be added to the barrier layer, and the specific preparation method of the nano titanium dioxide fiber is as follows:
s51: mixing 1mol of titanium chloride and 0.02mol of yttrium chloride, adding the mixture into a mixed solvent of 30ml of dichloromethane and 0.18ml of isopropyl ether, ultrasonically stirring for 1h, and drying at 85 ℃ to obtain a first mixture;
s52: placing the first mixture into a reaction kettle, and dropwise adding a 45wt% sodium hydroxide solution (the molar ratio of the first mixture to the sodium hydroxide is 1.02;
s53: dissolving 10 parts by mass of polyvinylpyrrolidone in 40-60 parts by mass of a solvent, and mixing to prepare a first mixed solution;
s54: mixing the first mixed solution and the first mixed sol according to the proportion of 1: (0.8-1.5) and stirring for 2-5 hours to obtain spinning solution;
s55: and (3) performing electrostatic spinning on the spinning solution, collecting by using a movable flat plate, and performing vacuum drying on the collected fibers at the temperature of 60 ℃ for 12 hours to prepare the nano titanium dioxide fibers.
Wherein the solvent consists of dimethylformamide and acetone, and the mass fraction of the dimethylformamide is 50-75%. The yttrium element in the yttrium chloride can be replaced by other rare earth elements, such as ytterbium, dysprosium, gadolinium and the like.
Compared with the common nano titanium dioxide fiber, the nano titanium dioxide fiber provided by the embodiment of the invention is added with the rare earth element, and the rare earth element can enhance the absorption of ultraviolet light, so that the photocatalysis capability of the nano titanium dioxide fiber is improved, and the photocatalysis sterilization function of the nano titanium dioxide fiber is ensured. Because the rare earth element and the titanium dioxide cannot be well combined and the photocatalysis promoting effect is limited by using a simple method for distributing the rare earth element on the surface of the nano titanium dioxide fiber, in the step of the embodiment S52 of the invention, the mixture of the rare earth element and the titanium element is prepared into a sol state, so that the rare earth element and the titanium element are uniformly dispersed on a molecular level, and the rare earth element is embedded between the titanium dioxide in the prepared nano titanium dioxide fiber, so that the energy reaching the rare earth element can be rapidly transmitted to the titanium dioxide, and the photocatalysis capability of the nano titanium dioxide fiber is improved.
In the sol of the mixture of the rare earth element and the titanium element, the rare earth element and the titanium element exist as a rare earth hydroxide and a titanium hydroxide, respectively. Since the rare earth hydroxide sol and the titanium hydroxide sol are very sensitive to the acid-base environment of the solution, and the PH values of the rare earth hydroxide sol and the titanium hydroxide sol are different, when the mixture sol of the rare earth element and the titanium element is prepared by dropping the rare earth hydroxide sol into the titanium hydroxide sol, the rare earth hydroxide sol and the titanium element are very likely to precipitate, and the mixture sol of the rare earth element and the titanium element is difficult to generate, so in the step of the embodiment S51 of the present invention, the rare earth element and the titanium element are combined by intermolecular force or chemical bond, and in the process of adding alkali in the step of S52, the rare earth hydroxide and the titanium hydroxide can be simultaneously formed or precipitated, the PH value of the solution is easy to control, and the stable mixture sol of the rare earth element and the titanium element can be generated. Moreover, the rare earth element and the titanium element are combined through intermolecular force or chemical bond, so that the connection between the rare earth element and the titanium dioxide in the nano titanium dioxide fiber can be further enhanced, the energy can be more rapidly transmitted between the rare earth element and the titanium dioxide, and the integral antibacterial capability of the nano titanium dioxide fiber is improved.
Preferably, the length of the nano titanium dioxide fiber is between 0.01um and 0.1um.
Most of the existing packaging materials need to have a sealing function, but the aluminum foil layer cannot be heated and sealed, so that the aluminum foil material can be heated and sealed through coating of the heat-seal paste in the embodiment of the invention. In the embodiment of the invention, the heat-seal paste comprises vinyl chloride-propionate copolymer, modified waterborne polyurethane, nano titanium dioxide, ethyl acetate and butyl acetate. The water-based polyurethane is an adhesive resin, has strong adhesiveness after being modified, and can enhance the adhesiveness of a heat sealing layer and improve the heat sealing strength. The nano titanium dioxide has larger bulk density, is easier to be mixed with resin and is convenient to process. The ethyl acetate and the butyl acetate are used as solvents, and the chloroethylene-propionate copolymer, the modified waterborne polyurethane and the nano titanium dioxide can be efficiently mixed.
Preferably, in the heat seal paste, the polyvinyl chloride-propionate copolymer: modified waterborne polyurethane: titanium dioxide: ethyl acetate: the mass portion ratio of butyl acetate is (8-15): (28-30): (0.5-0.8): (350-400): (50-80).
Preferably, the coating thickness of the coated heat-sealing paste is 1um to 10um.
Since the aluminum foil layer itself is easily torn, which is very inconvenient in daily processing, in the embodiment of the present invention, an aluminum foil material having excellent toughness is selected as the aluminum foil layer. Specifically, the aluminum foil layer is formed by rolling an aluminum alloy material, and the aluminum alloy material comprises the following components in parts by mass (97.8-98.2): (0.4-0.6): (0.4-0.6) aluminum, iron and nickel, and the thickness of the aluminum foil layer is 20um to 50um. The addition of iron and nickel can strengthen the strength of the aluminum foil layer.
As shown in fig. 1, the separable packaging material in the embodiment of the present invention can be applied to a packaging container, and a closure 100 of the packaging container is composed of the separable packaging material prepared in the embodiment of the present invention, and the separable packaging material has a specific layer structure as shown in fig. 2, wherein 110 is a barrier layer, 120 is an adhesive paste, 130 is an aluminum foil layer, and 140 is a heat-sealing paste.
The method for manufacturing the aluminum foil packaging material of the present invention will be described in detail with reference to specific examples. Examples 1 to 3 samples of aluminum foil packaging material were prepared. Wherein, nano titanium dioxide particles are added into the barrier layer in the embodiment 1, and nano titanium dioxide fibers are added into the barrier layers in the embodiments 2 and 3; the aluminum foil layer of example 2 is a conventional aluminum foil material and the aluminum foil layers of examples 1 and 3 are reinforced aluminum foil materials. The raw materials in the following examples were all obtained by commercial procurement.
Example 1
The present embodiment provides a method for preparing a separable packaging material, including:
s100: putting 300 parts by mass of deionized water into a reaction kettle provided with a return pipe, adding 50 parts by mass of vinyl pyrrolidone and 30 parts by mass of acrylamide to dissolve, heating the reaction kettle to 60 ℃ in a nitrogen environment, adding 0.2 part by mass of azodiisoheptanonitrile while stirring, reacting for 2-3 hours, washing and drying a product, and storing for later use;
s200: taking 70 parts by mass of the product in S100, mixing with 8 parts by mass of sodium polyacrylate and 3 parts by mass of sodium hydroxide, dissolving in 320 parts by mass of water, stirring in an ultrasonic stirrer for 15 minutes, and standing the product for 1 hour to prepare bonding slurry;
s300: weighing 30 parts by mass of poly d-lactic acid, 30 parts by mass of poly L-lactic acid, 50 parts by mass of polyvinyl alcohol, 20 parts by mass of maleic anhydride graft compatilizer, 3 parts by mass of nano titanium dioxide particles, 16 parts by mass of calcium stearate, 8 parts by mass of lignin, 8 parts by mass of starch, 3 parts by mass of oxidized polyethylene wax and 3 parts by mass of erucamide, mixing, adding into a high-speed mixer, stirring uniformly at 120 ℃, adding into a double-screw extruder, extruding into a film at the processing temperature of 150-160 ℃ and the screw rotating speed of 180rpm, and obtaining a barrier layer;
s400: dissolving 10 parts by mass of polyvinyl chloride-propionate copolymer, 30 parts by mass of modified waterborne polyurethane and 0.7 part by mass of nano titanium dioxide particles into a solution consisting of 350 parts by mass of ethyl acetate and 70 parts by mass of butyl acetate, and uniformly mixing to prepare heat-seal slurry;
s500: and coating the bonding slurry on an aluminum foil layer by using a coating machine, wherein the aluminum foil layer is made of an aluminum foil material containing iron and nickel for reinforcement, then laying a barrier layer at the upper end of the bonding slurry, coating the heat-sealing slurry on the other surface of the aluminum foil layer by using the coating machine after the bonding slurry is stable, and drying the heat-sealing slurry to prepare the separable packaging material.
Example 2
This embodiment provides a method for producing a separable packaging material, the method comprising:
s100: putting 300 parts by mass of deionized water into a reaction kettle provided with a return pipe, adding 50 parts by mass of vinyl pyrrolidone and 30 parts by mass of acrylamide to dissolve, heating the reaction kettle to 60 ℃ in a nitrogen environment, adding 0.2 part by mass of azobisisoheptonitrile while stirring, reacting for 2-3 hours, washing and drying a product, and storing for later use;
s200: taking 70 parts by mass of the product in S100, mixing with 8 parts by mass of sodium polyacrylate and 3 parts by mass of sodium hydroxide, dissolving in 320 parts by mass of water, stirring in an ultrasonic stirrer for 15 minutes, and standing the product for 1 hour to prepare bonding slurry;
s300: mixing 1mol of titanium chloride and 0.02mol of yttrium chloride, adding the mixture into a mixed solvent of 30ml of dichloromethane and 0.18ml of isopropyl ether, ultrasonically stirring for 1h, and drying at 85 ℃ to obtain a first mixture; placing the first mixture into a reaction kettle, and dropwise adding a 45wt% sodium hydroxide solution (the molar ratio of the first mixture to the sodium hydroxide is 1.02; dissolving 10 parts by mass of polyvinylpyrrolidone in 40-60 parts by mass of a solvent, and mixing to prepare a first mixed solution; mixing the first mixed solution and the first mixture sol according to the proportion of 1: (0.8-1.5) and stirring for 2-5 hours to obtain spinning solution; taking the spinning solution for electrostatic spinning, collecting by using a movable flat plate, and placing the collected fibers at 60 ℃ for vacuum drying for 12 hours to prepare nano titanium dioxide fibers for later use;
s400: weighing 30 parts by mass of poly d-lactic acid, 30 parts by mass of poly L-lactic acid, 50 parts by mass of polyvinyl alcohol, 20 parts by mass of maleic anhydride grafted compatilizer, 3 parts by mass of nano titanium dioxide fiber, 16 parts by mass of calcium stearate, 8 parts by mass of lignin, 8 parts by mass of starch, 3 parts by mass of oxidized polyethylene wax and 3 parts by mass of erucamide, mixing, adding into a high-speed mixer, uniformly stirring at 120 ℃, adding into a double-screw extruder, extruding at the processing temperature of 150-160 ℃ and the rotating speed of the screw of 180rpm, and forming a film at 180 ℃ to obtain a barrier layer;
s500: dissolving 10 parts by mass of polyvinyl chloride-propionate copolymer, 30 parts by mass of modified waterborne polyurethane and 0.7 part by mass of nano titanium dioxide particles into a solution consisting of 350 parts by mass of ethyl acetate and 70 parts by mass of butyl acetate, and uniformly mixing to prepare heat-seal slurry;
s600: and coating the bonding slurry on an aluminum foil layer by using a coating machine, wherein the aluminum foil layer is made of a common commercially available aluminum foil material, then laying a barrier layer at the upper end of the bonding slurry, coating the heat-sealing slurry on the other surface of the aluminum foil layer by using the coating machine after the bonding slurry is stable, and drying the heat-sealing slurry to prepare the separable packaging material.
Example 3
This embodiment provides a method for producing a separable packaging material, the method comprising:
s100: putting 300 parts by mass of deionized water into a reaction kettle provided with a return pipe, adding 50 parts by mass of vinyl pyrrolidone and 30 parts by mass of acrylamide to dissolve, heating the reaction kettle to 60 ℃ in a nitrogen environment, adding 0.2 part by mass of azodiisoheptanonitrile while stirring, reacting for 2-3 hours, washing and drying a product, and storing for later use;
s200: taking 70 parts by mass of the product in S100, mixing with 8 parts by mass of sodium polyacrylate and 3 parts by mass of sodium hydroxide, dissolving in 320 parts by mass of water, stirring in an ultrasonic stirrer for 15 minutes, and standing the product for 1 hour to prepare bonding slurry;
s300: mixing 1mol of titanium chloride and 0.02mol of yttrium chloride, adding the mixture into a mixed solvent of 30ml of dichloromethane and 0.18ml of isopropyl ether, ultrasonically stirring for 1h, and drying at 85 ℃ to obtain a first mixture; placing the first mixture into a reaction kettle, and dropwise adding a 45wt% sodium hydroxide solution (the molar ratio of the first mixture to the sodium hydroxide is 1.02; dissolving 10 parts by mass of polyvinylpyrrolidone in 40-60 parts by mass of a solvent, and mixing to prepare a first mixed solution; mixing the first mixed solution and the first mixed sol according to the proportion of 1: (0.8-1.5) and stirring for 2-5 hours to obtain spinning solution; taking the spinning solution for electrostatic spinning, collecting by using a movable flat plate, and placing the collected fibers at 60 ℃ for vacuum drying for 12 hours to prepare nano titanium dioxide fibers for later use;
s400: weighing 30 parts by mass of poly d-lactic acid, 30 parts by mass of poly L-lactic acid, 50 parts by mass of polyvinyl alcohol, 20 parts by mass of maleic anhydride grafted compatilizer, 3 parts by mass of nano titanium dioxide fiber, 16 parts by mass of calcium stearate, 8 parts by mass of lignin, 8 parts by mass of starch, 3 parts by mass of oxidized polyethylene wax and 3 parts by mass of erucamide, mixing, adding into a high-speed mixer, uniformly stirring at 120 ℃, adding into a double-screw extruder, extruding at the processing temperature of 150-160 ℃ and the rotating speed of the screw of 180rpm, and forming a film at 180 ℃ to obtain a barrier layer;
s500: dissolving 10 parts by mass of polyvinyl chloride-propionate copolymer, 30 parts by mass of modified waterborne polyurethane and 0.7 part by mass of nano titanium dioxide particles into a solution consisting of 350 parts by mass of ethyl acetate and 70 parts by mass of butyl acetate, and uniformly mixing to prepare heat-seal slurry;
s600: and coating the bonding slurry on an aluminum foil layer by using a coating machine, wherein the aluminum foil layer is made of an aluminum foil material reinforced by iron and nickel, then laying a barrier layer at the upper end of the bonding slurry, coating the heat-sealing slurry on the other surface of the aluminum foil layer by using the coating machine after the bonding slurry is stable, and drying the heat-sealing slurry to prepare the separable packaging material.
Performance testing
The samples prepared in examples 1 to 3 were tested for peel strength using the national standard GB/T8808-1988. The samples were cut into 15 mm by 200 mm test specimens. The results are shown in Table 1.
TABLE 1
Figure 41409DEST_PATH_IMAGE001
The results show that the separable packaging material prepared by the invention has good adhesive property and can meet the use requirements of most packaging materials.
The samples prepared in examples 1 to 3 were further tested, cut into 1 mm × 10 mm test strips, and after soaking in water at 90 degrees celsius, the peeling of the aluminum foil layer and the barrier layer was observed, and the results are shown in table 2.
TABLE 2
Figure 974861DEST_PATH_IMAGE002
The above results show that the separable packaging material prepared by the invention can be completely separated after being stirred for 60 minutes at the water temperature of 90 ℃.
The samples prepared in examples 1 to 3 were subjected to an antibacterial test using the national standard GB-15979-2002, and the test results are shown in table 3.
TABLE 3
Figure 285756DEST_PATH_IMAGE003
The above results show that the separable packaging material prepared by the invention has excellent antibacterial performance.
The features of the terms first and second in the description and in the claims of the invention may explicitly or implicitly comprise one or more of these features. In the description of the present invention, "a plurality" means two or more unless otherwise specified. In addition, "and/or" in the specification and claims means at least one of connected objects, a character "/", and generally means that the former and latter related objects are in an "or" relationship.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims (10)

1. A method of making a separable packaging material, comprising:
s10: coating bonding slurry on the first surface of the aluminum foil layer, and laying a barrier layer on the bonding slurry;
s20: coating heat-sealing slurry on the second surface of the aluminum foil layer and drying to obtain the separable packaging material;
wherein the bonding paste is prepared by the following steps:
s31: weighing 45-55 parts by mass of vinyl pyrrolidone and 10-55 parts by mass of acrylamide, placing in 300-400 parts by mass of water, heating to 60-65 ℃ in an inert gas environment, stirring for 2-3 h, adding 0.1-0.3 part by mass of an initiator in the stirring process, washing and drying to obtain a first polymer;
s32: dissolving 40-80 parts by mass of the first polymer, 8-10 parts by mass of sodium polyacrylate and 2-5 parts by mass of sodium hydroxide in 300-350 parts by mass of water, and ultrasonically mixing to prepare the bonding slurry;
the barrier layer comprises a base material, a connecting material and an antibacterial material, wherein the base material comprises poly d-lactic acid, poly L-lactic acid and polyvinyl alcohol, the connecting material comprises a maleic anhydride grafted compatilizer, the antibacterial material comprises a titanium dioxide antibacterial agent, and the weight ratio of poly d-lactic acid: the poly-L-lactic acid: the polyvinyl alcohol: the maleic anhydride grafted compatibilizer: the titanium dioxide antibacterial agent comprises the following components in parts by mass (20-50): (20-50): (30-60): (20-30): (1-5);
the heat-sealing slurry comprises the following components in parts by mass (8-15): (28-30): (0.5-0.8): (350-400): (50-80) polyvinyl chloride-propionate copolymer, modified waterborne polyurethane, titanium dioxide, ethyl acetate and butyl acetate.
2. The method according to claim 1, wherein in the S31, the initiator includes: at least one of azobisisoheptonitrile, azobisisobutyronitrile and dimethyl azobisisobutyrate.
3. The method of claim 1, wherein the barrier layer further comprises calcium stearate, lignin, starch, oxidized polyethylene wax, erucamide.
4. The method of claim 3, wherein the barrier layer is prepared by:
s41: weighing poly d-lactic acid, poly L-lactic acid, polyvinyl alcohol, maleic anhydride graft compatilizer, titanium dioxide antibacterial agent, calcium stearate, lignin, starch, oxidized polyethylene wax and erucamide, and uniformly stirring at the temperature of 100-120 ℃ to obtain a first mixture;
s42: heating the first mixture to 150-160 ℃, carrying out extrusion forming, and granulating to prepare a second mixture;
s43: and extruding the second mixture at 170-190 ℃ to form a film, thus obtaining the barrier layer.
5. The preparation method according to claim 4, wherein in the step S41, the weight ratio of 30 parts to 30 parts is measured: 30:50:20:3:16:8:8:3:3 poly d-lactic acid, poly L-lactic acid, polyvinyl alcohol, maleic anhydride grafting compatilizer, titanium dioxide antibacterial agent, calcium stearate, lignin, starch, oxidized polyethylene wax and erucamide.
6. The production method according to claim 1,
the thickness of the barrier layer is 5um to 20um; and/or
In the S20, the thickness of the heat-seal paste applied over the second surface of the aluminum foil layer is 1um to 10um.
7. The preparation method according to claim 1, characterized in that in S31, 50 parts by mass of the vinylpyrrolidone and 20 to 30 parts by mass of the acrylamide are weighed and placed in 320 parts by mass of the water; in the S10, the thickness of the adhesive paste coated over the first surface of the aluminum foil layer is 2um to 10um.
8. The production method according to any one of claims 1 to 7, wherein the aluminum foil layer is formed by rolling an aluminum alloy material including, in parts by mass, a metal alloy material comprising, in the range of (97.8 to 98.2): (0.4-0.6): (0.4-0.6) aluminum, iron, nickel, the thickness of aluminium foil layer is 20um to 50um.
9. A separable packaging material produced by the production method according to any one of claims 1 to 8.
10. A packaging container produced using the separable packaging material according to claim 9.
CN202211264012.6A 2022-10-17 2022-10-17 Separable packaging material, preparation method thereof and packaging container Active CN115352148B (en)

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