CN112757735A - Antibacterial easy-to-tear moisture absorption type PE film, preparation method and packaging structure - Google Patents
Antibacterial easy-to-tear moisture absorption type PE film, preparation method and packaging structure Download PDFInfo
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- CN112757735A CN112757735A CN202110004680.4A CN202110004680A CN112757735A CN 112757735 A CN112757735 A CN 112757735A CN 202110004680 A CN202110004680 A CN 202110004680A CN 112757735 A CN112757735 A CN 112757735A
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- 230000000844 anti-bacterial effect Effects 0.000 title claims abstract description 138
- 238000010521 absorption reaction Methods 0.000 title claims abstract description 113
- 238000004806 packaging method and process Methods 0.000 title claims abstract description 12
- 238000002360 preparation method Methods 0.000 title abstract description 15
- 239000004698 Polyethylene Substances 0.000 claims abstract description 76
- 229920000092 linear low density polyethylene Polymers 0.000 claims abstract description 57
- 239000004707 linear low-density polyethylene Substances 0.000 claims abstract description 57
- 239000004594 Masterbatch (MB) Substances 0.000 claims abstract description 52
- 229920001684 low density polyethylene Polymers 0.000 claims abstract description 52
- 239000004702 low-density polyethylene Substances 0.000 claims abstract description 52
- 239000002994 raw material Substances 0.000 claims abstract description 32
- 239000002245 particle Substances 0.000 claims abstract description 30
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 13
- 239000000203 mixture Substances 0.000 claims abstract description 4
- 239000002250 absorbent Substances 0.000 claims description 32
- 230000002745 absorbent Effects 0.000 claims description 32
- 239000003242 anti bacterial agent Substances 0.000 claims description 19
- 238000001125 extrusion Methods 0.000 claims description 13
- 238000010096 film blowing Methods 0.000 claims description 12
- 238000002156 mixing Methods 0.000 claims description 12
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims description 11
- 239000006057 Non-nutritive feed additive Substances 0.000 claims description 11
- 229910021536 Zeolite Inorganic materials 0.000 claims description 11
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical group O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims description 11
- 229910052731 fluorine Inorganic materials 0.000 claims description 11
- 239000011737 fluorine Substances 0.000 claims description 11
- 239000002808 molecular sieve Substances 0.000 claims description 11
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 claims description 11
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- 238000000034 method Methods 0.000 claims description 8
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- 239000004599 antimicrobial Substances 0.000 claims description 3
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- 238000007789 sealing Methods 0.000 abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 3
- 230000035945 sensitivity Effects 0.000 abstract description 2
- 239000000463 material Substances 0.000 description 11
- 230000000052 comparative effect Effects 0.000 description 9
- 238000010438 heat treatment Methods 0.000 description 7
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- VXNZUUAINFGPBY-UHFFFAOYSA-N ethyl ethylene Natural products CCC=C VXNZUUAINFGPBY-UHFFFAOYSA-N 0.000 description 1
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- 231100000206 health hazard Toxicity 0.000 description 1
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- 238000000638 solvent extraction Methods 0.000 description 1
- 125000000383 tetramethylene group Chemical group [H]C([H])([*:1])C([H])([H])C([H])([H])C([H])([H])[*:2] 0.000 description 1
- 239000012815 thermoplastic material Substances 0.000 description 1
Classifications
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- B32—LAYERED PRODUCTS
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- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
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- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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- B29C48/0017—Combinations of extrusion moulding with other shaping operations combined with blow-moulding or thermoforming
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- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
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- B29C48/07—Flat, e.g. panels
- B29C48/08—Flat, e.g. panels flexible, e.g. films
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- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
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- 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
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- 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
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- 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
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- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
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Abstract
The invention provides an antibacterial easy-uncovering moisture absorption type PE film, which comprises the following components in sequence from outside to inside: the outer layer comprises the following raw materials in percentage by weight of 3-5: 1 of low density polyethylene, linear low density polyethylene; the moisture absorption layer is made of moisture absorption master batches; the antibacterial easy-uncovering layer comprises the following raw materials of antibacterial master batch, an opening agent and a mixture of 1: 1-3: 3-7 easy-to-tear particles, linear low density polyethylene and low density polyethylene; the addition amount of the antibacterial master batch and the addition amount of the opening agent are respectively 1-5% and 1-3% of the total weight of the raw materials of the antibacterial easy-uncovering layer. The invention also provides a preparation method and a packaging structure. The moisture absorption layer provides a moisture-proof moisture absorption function, can meet the requirement of sensitivity to water vapor and prolongs the shelf life of the contents; the antibacterial easy-to-uncover layer meets the requirements of good heat-seal sealing performance, easy uncovering of the seal, no filament-forming phenomenon during uncovering, and no generation of debris; the antibacterial easy-uncovering layer is added with antibacterial particles, so that the sanitary safety of the contents can be improved.
Description
Technical Field
The invention relates to the field of packaging materials, in particular to an antibacterial easy-to-tear moisture absorption type PE film, a preparation method and a packaging structure.
Background
The application of the packaging material is wider and wider, and the use amount is larger and larger. Packaging materials involved in the food industry or the medical apparatus industry, such as packaging bags for food, cannulas for medical apparatus, connecting tubes, catheters for internal body, can cause food contamination or medical apparatus contamination and cause great safety and health hazards if the packaging materials are infected with bacteria during storage or use. In addition, when opening a food packaging bag or a packaging material for medical instruments, fragments, chips, etc. are generated by tearing the packaging material, which also involves safety or hygiene problems. In addition, the packaging material needs to be protected from moisture during storage to affect the shelf life during use.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides the antibacterial easy-to-tear moisture absorption type PE film which has good mechanical strength, easy opening, moisture absorption, moisture prevention and antibacterial properties.
In order to achieve the above object, the present invention is achieved by the following technical solutions.
The invention provides an antibacterial easy-uncovering moisture absorption type PE film, which comprises the following components in sequence from outside to inside:
the outer layer is used for printing or compounding, and the raw materials comprise the following components in percentage by weight: 1 of low density polyethylene, linear low density polyethylene;
the moisture absorption layer is made of moisture absorption master batches;
the antibacterial easy-uncovering layer comprises the following raw materials of antibacterial master batch, an opening agent and a mixture of 1: 1-3: 3-7 easy-to-tear particles, linear low density polyethylene and low density polyethylene; wherein the release particles are incompatible with linear low density polyethylene and low density polyethylene; the addition amount of the antibacterial master batch and the addition amount of the opening agent are respectively 1-5% and 1-3% of the total weight of the raw materials of the antibacterial easy-uncovering layer.
Preferably, the moisture absorption master batch comprises a moisture absorbent and a weight ratio of 5: 1 to 3 of low density polyethylene, linear low density polyethylene; the moisture absorbent accounts for 20-50% of the total weight of the moisture absorbent master batch.
Preferably, the moisture absorbent is a zeolite molecular sieve moisture absorbent; the linear low-density polyethylene of the moisture-absorbing master batch is metallocene linear low-density polyethylene.
Preferably, the antibacterial master batch comprises the following components in a weight ratio of 2.5-5: 12: 5, low density polyethylene, linear low density polyethylene.
Preferably, the antibacterial agent is a modified nano ZnO inorganic antibacterial agent; the easy-uncovering particles are PB-1 particles.
Preferably, the outer layer also comprises a fluorine-containing processing aid with the weight content of 0.27-0.33%;
and/or the antibacterial easy-uncovering layer also comprises a fluorine-containing processing aid with the weight content of 0.27-0.33%.
Preferably, the thickness of the outer layer is 10-20 μm; the thickness of the moisture absorption layer is 20-60 mu m; the thickness of the antibacterial easy-uncovering layer is 15-30 mu m.
Preferably, the method comprises the following steps: and adding the raw materials of the outer layer, the moisture absorption layer and the antibacterial easy-uncovering layer into corresponding charging barrels of a three-layer co-extrusion film blowing machine respectively according to a ratio, and performing three-layer co-extrusion blow molding to obtain the antibacterial easy-uncovering moisture absorption type PE film.
Preferably, the method further comprises the steps of:
uniformly mixing a moisture absorbent, low-density polyethylene and linear low-density polyethylene according to a ratio, and then blending, extruding and granulating to obtain moisture-absorbing master batches;
the antibacterial agent, the low-density polyethylene and the linear low-density polyethylene are uniformly mixed according to the proportion and then are blended, extruded and granulated to obtain the antibacterial master batch.
A third object of the present invention is to provide an antibacterial easy-to-tear moisture absorption packaging structure, comprising the antibacterial easy-to-tear moisture absorption PE film as described above.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides an antibacterial easy-to-tear-off moisture absorption type PE film which sequentially comprises an outer layer, a moisture absorption layer and an antibacterial easy-to-tear-off layer from outside to inside. The moisture absorption layer as the middle layer is made of moisture absorption master batches to provide moisture-proof and moisture-absorption functions, meet the requirement on sensitivity to water vapor and prolong the shelf life of contents. The easy-to-tear particles are added in the antibacterial easy-to-tear layer serving as the inner layer, and the incompatibility of the easy-to-tear particles and the low-density polyethylene and the linear low-density polyethylene in the antibacterial easy-to-tear layer is utilized, so that the sealing is easy to tear while the heat-seal sealing performance of the antibacterial easy-to-tear layer is good, the interface is uniform and clean without the phenomenon of thread lifting when the sealing is torn, and no scraps are produced. In addition, the antibacterial easy-uncovering layer is added with antibacterial particles, so that the antibacterial easy-uncovering layer has antibacterial performance, and can improve the hygienic safety of contents and prevent the contents from being infected by virus and bacteria for packaging medicines or foods.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood and to be implemented in accordance with the content of the description, the following detailed description of the preferred embodiments of the present invention is given. Specific embodiments of the present invention are given in detail by the following examples.
Detailed Description
The foregoing and other objects, features, aspects and advantages of the present invention will become more apparent to those skilled in the art from the following detailed description, which, taken in conjunction with the annexed drawings, discloses a preferred embodiment of the present invention. Terms concerning attachments, coupling and the like (e.g., "connected" and "attached") refer to a relationship wherein structures are secured or attached, either directly or indirectly, to one another through intervening structures, as well as both movable or rigid attachments or relationships, unless expressly described otherwise.
The present invention is further described below with reference to specific embodiments, and it should be noted that, without conflict, any combination between the embodiments or technical features described below may form a new embodiment.
The invention provides an antibacterial easy-uncovering moisture absorption type PE film, which comprises the following components in sequence from outside to inside:
the outer layer is used for printing or compounding according to customer's demand, and its raw materials include the weight ratio 3 ~ 5: 1 of low density polyethylene, linear low density polyethylene; the outer layer provides strength, stiffness and waterproof performance for the antibacterial easy-uncovering moisture absorption type PE film; further, the low density polyethylene model is 2420H, the linear low density polyethylene model is seiko 0220A; further, the weight ratio of the low density polyethylene to the linear low density polyethylene is 4: 1, the outer layer has good mechanical strength and processability;
the moisture absorption layer is made of moisture absorption master batches; the moisture absorption layer has moisture absorption performance so as to prevent the contents packaged by the antibacterial easy-to-tear moisture absorption type PE film from being affected with moisture;
the antibacterial easy-uncovering layer comprises the following raw materials of antibacterial master batch, an opening agent and a mixture of 1: 1-3: 3-7 easy-to-tear particles, linear low density polyethylene and low density polyethylene; wherein the release particles are incompatible with linear low density polyethylene and low density polyethylene; the addition amount of the antibacterial master batch and the addition amount of the opening agent are respectively 1-5% and 1-3% of the total weight of the raw material of the antibacterial easy-uncovering layer; further, the opening agent is a schumann AMF705HF opening slipping agent or EZA opening agent. The antibacterial master batch provides antibacterial performance for the antibacterial easy-uncovering layer; the opening agent prevents the antibacterial easy-to-tear layer as the inner layer from being adhered together in the process of forming the film, and the brightness of the film is influenced due to the difficulty in opening; the method has the advantages that the easy-to-uncover particles are incompatible with linear low-density polyethylene and are blended into the linear low-density polyethylene and the low-density polyethylene, so that the heat seal strength of the antibacterial easy-to-uncover layer is reduced, after the antibacterial easy-to-uncover moisture-absorption type PE film is subjected to heat sealing, the heat seal strength is 3-15N/15 mm, the fluctuation of the peeling force is less than or equal to 3N/15mm during uncovering, the peeling interface is clean, uniform, free of scrap falling and filament forming, smooth in hand feeling, free of pause and layering, and accordingly the prepared antibacterial easy-to-uncover moisture-absorption type PE film is easy to uncover. Further, the low density polyethylene was a catal FD0274, and the linear low density polyethylene was a 0220 KG. The antibacterial easy-to-tear layer serves as an inner layer, the seal is easy to open while the heat sealing performance is good, no scraps are left after tearing, the seal is complete, the stripping interface has no filament-forming phenomenon, and the antibacterial easy-to-tear layer is antibacterial and moistureproof.
In one embodiment, the moisture-absorbing master batch comprises a moisture absorbent and a weight ratio of 5: 1 to 3 of low density polyethylene, linear low density polyethylene; the moisture absorbent accounts for 20-50% of the total weight of the moisture absorbent master batch. The low-density polyethylene and the linear low-density polyethylene in the moisture-absorbing master batch are beneficial to forming an intermediate layer film and have certain strength. The moisture absorbent in the moisture absorption master batch has moisture absorption performance and can absorb moisture permeating into the moisture absorption layer from the outer layer of the antibacterial easy-to-tear moisture absorption type PE film or the inner layer of the antibacterial easy-to-tear moisture absorption type PE film, so that the moisture content in the inner space of the antibacterial easy-to-tear moisture absorption type PE film package is reduced, and the moisture of the content in the package is prevented from being damped. The weight ratio of the low-density polyethylene to the linear low-density polyethylene is 5: 1-3, the moisture absorbent accounts for 20% -50% of the total weight of the moisture absorbent master batch, the low-density polyethylene, the linear low-density polyethylene and the moisture absorbent are easy to blend and extrude, and the prepared moisture absorbent layer is good in moisture absorption effect and low in cost. Further, the low density polyethylene in the moisture absorption master batch is Catal FD0274, and the linear low density polyethylene is Mitsui SP 1520.
Further, the moisture absorbent is a zeolite molecular sieve moisture absorbent; the linear low-density polyethylene of the moisture-absorbing master batch is metallocene linear low-density polyethylene. The zeolite molecular sieve moisture absorbent is an ultra-microporous adsorbent and has excellent moisture absorption capacity under low humidity conditions. The metallocene linear low density polyethylene has narrow relative molecular mass distribution, and the comonomer is uniformly distributed on the main chain, so that compared with the traditional linear low density polyethylene, the metallocene linear low density polyethylene has obviously improved physical and mechanical properties, such as impact resistance, puncture resistance and solvent extraction resistance. The zeolite molecular sieve moisture absorbent accounts for 20-50% of the total weight of the moisture absorption master batch, and further the weight ratio of the zeolite molecular sieve moisture absorbent to the low density polyethylene to the linear low density polyethylene in the moisture absorption master batch is 3: 2: 1, good moisture absorption performance, low cost and easy processing. Further, the zeolite molecular sieve moisture absorbent is JLH-013. Furthermore, the saturated moisture absorption amount of the moisture absorption layer can be adjusted through the thickness of the moisture absorption layer and also can be adjusted through the proportion of the moisture absorbent in the moisture absorption master batch.
In one embodiment, the antibacterial masterbatch comprises the following components in a weight ratio of 2.5-5: 12: 5, low density polyethylene, linear low density polyethylene. The antibacterial agent is blended with low-density polyethylene and linear low-density polyethylene for blending and extrusion, so as to facilitate granulation of the antibacterial master batch. The weight ratio of the antibacterial agent to the low-density polyethylene to the linear low-density polyethylene is defined to be 2.5-5: 12: and 5, the cost is reduced while the antibacterial effect of the antibacterial master batch is ensured, and the granulation of the antibacterial master batch is facilitated. Furthermore, the type of the low-density polyethylene in the antibacterial master batch is Catal FD0274, and the type of the linear low-density polyethylene is 0220 KG.
Further, the antibacterial agent is a modified nano ZnO inorganic antibacterial agent. Furthermore, the silane coupling agent (KH560) modified nano ZnO inorganic antibacterial agent is adopted, and the silane coupling agent is grafted on the surface of the nano ZnO in a covalent bond mode, so that the grafted product is more stable. The weight ratio of the modified nano ZnO inorganic antibacterial agent to the low-density polyethylene to the linear low-density polyethylene in the antibacterial master batch is 2.5-5: 12: 5, preferably, the weight ratio of the modified nano ZnO inorganic antibacterial agent, the low density polyethylene and the linear low density polyethylene in the antibacterial master batch is 3: 12: 5, good antibacterial performance, low cost and easy processing.
In one embodiment, the release particles are PB-1 particles. PB-1 is poly-1-butyleneThe ethylene PB-1 is a semi-crystalline and highly isotactic thermoplastic material, is incompatible with linear low-density polyethylene and low-density polyethylene, and reduces the peel strength of the antibacterial easy-uncovering layer, so that the antibacterial easy-uncovering moisture-absorption PE film seal is easy to uncover. Further, the easy-uncovering particles are PB-8640M, the PB-8640M is 1-butene random copolymer with a small ethylene content, and the weight ratio of the easy-uncovering particles to the linear low-density polyethylene to the low-density polyethylene is 1: 1-3: 3-7 hours later, the self-sealing strength of the antibacterial easy-to-uncover moisture absorption type PE film is moderate, namely the peeling strength is moderate, and the film is easy to heat seal and uncover. Further, the tamper-evident particles are Barsell PB-8640M, the solvent index is 1g/10min, and the density is 0.906g/cm3。
In one embodiment, the outer layer further comprises a fluorine-containing processing aid in an amount of 0.27% to 0.33% by weight;
and/or the antibacterial easy-uncovering layer also comprises a fluorine-containing processing aid with the weight content of 0.27-0.33%. A certain amount of fluorine-containing processing aid is added into the outer layer and/or the inner layer, the surface energy of the fluorine-containing processing aid is low, the internal friction among particles can be reduced in plastic processing, the melting rate and the deformability of the melt are increased, the apparent age of the melt is reduced, the plasticizing effect is improved, and the processed outer layer and/or inner layer is beautiful. Further, the fluorine-containing processing aid is model number schumann AMF705 HF.
In one embodiment, the thickness of the outer layer is 10 to 20 μm; the thickness of the moisture absorption layer is 20-60 mu m; the thickness of the antibacterial easy-uncovering layer is 15-30 mu m. The antibacterial easy-uncovering moisture absorption type PE film is moderate in thickness, good in air permeability and water permeability, and the moisture absorption layer can absorb moisture smoothly.
The invention also provides a method for preparing the antibacterial easy-uncovering moisture absorption type PE film, which comprises the following steps: and adding the raw materials of the outer layer, the moisture absorption layer and the antibacterial easy-uncovering layer into corresponding charging barrels of a three-layer co-extrusion film blowing machine respectively according to a ratio, and performing three-layer co-extrusion blow molding to obtain the antibacterial easy-uncovering moisture absorption type PE film. The three-layer materials are sequentially subjected to extrusion, melting, shearing and plasticizing, uniform mixing, blow molding to form bubbles, cooling, annealing treatment and rolling in a three-layer co-extrusion film blowing machine to obtain the antibacterial easy-uncovering moisture absorption type PE film coiled material.
Specifically, three layers of raw materials, namely an outer layer, a moisture absorption layer and an antibacterial easy-uncovering layer, are added into each charging barrel of a three-layer co-extrusion film blowing machine according to a ratio, materials of each layer enter each layer of extruder according to a formula through an automatic metering device, the extruder is heated in a segmented mode, the materials pass through a filter screen, the materials pass through a double-screw extruder, the materials are heated, pressurized, melted, sheared and plasticized, the materials are mixed and mixed uniformly through a flow channel, the materials are blown into bubbles from a die head, and the bubbles are cut and rolled into a film through air ring cooling, blowing. The heating temperature of the first section of the extruder of the three-layer co-extrusion film blowing machine is 60-65 ℃, the heating temperature of the second section is 175-185 ℃, and the heating temperatures of the third section to the seventh section are 215-220 ℃ respectively; the filtering structure of the three-layer co-extrusion film blowing machine comprises a plurality of filter screens, and the mesh numbers of the filter screens distributed along the material flowing direction are respectively 40 meshes, 100 meshes, 300 meshes, 80 meshes and 40 meshes; the heating temperature of a first area, the heating temperature of a second area to a ninth area of a film blowing machine head of the three-layer co-extrusion film blowing machine is 195-200 ℃, and the heating temperature of a tenth area is 180-185 ℃ respectively; the rotary traction temperature of the three-layer co-extrusion film blowing machine is set to be 40 ℃; the annealing device temperature of the three-layer co-extrusion film blowing machine is respectively set to be 40 ℃, 35 ℃, 30 ℃ and 30 ℃. It should be understood that the mesh number of each layer of the filter screen, the rotary traction temperature and the temperature of the goods returning device of the three-layer co-extrusion blow molding machine can be adjusted up and down according to requirements, so as to be beneficial to processing and molding the antibacterial easy-to-tear moisture absorption type PE film.
Further, the method also comprises the following steps:
uniformly mixing a moisture absorbent, low-density polyethylene and linear low-density polyethylene according to a ratio, and then blending, extruding and granulating to obtain moisture-absorbing master batches;
the antibacterial agent, the low-density polyethylene and the linear low-density polyethylene are uniformly mixed according to the proportion and then are blended, extruded and granulated to obtain the antibacterial master batch.
Specifically, in one embodiment, the moisture absorbent is a zeolite molecular sieve moisture absorbent. The preparation method of the moisture-absorbing master batch comprises the following steps: adding the zeolite molecular sieve moisture absorbent, the low-density polyethylene and the linear low-density polyethylene into a high-speed stirrer according to the proportion, controlling the temperature at 105 +/-1 ℃, stirring at the speed of 500r/min, stirring and mixing for 15min, and then mixing, plasticizing, homogenizing, melting, extruding and granulating through a double-screw extruder to prepare the moisture-absorbing master batch. The temperatures of the zones 1-7 of the double-screw extruder are respectively 160, 170, 175, 180, 170 and 160 ℃, and the rotating speed of the double screws is 50 r/min. In one embodiment, the antimicrobial agent is a modified nano ZnO inorganic antimicrobial agent. The preparation method of the antibacterial master batch comprises the following steps: adding the modified nano ZnO inorganic antibacterial agent, the low-density polyethylene and the linear low-density polyethylene into a high-speed stirrer according to the proportion, controlling the temperature at 105 +/-1 ℃, stirring at the speed of 500r/min, stirring and mixing for 15min, and then mixing, plasticizing, homogenizing, melting, extruding and granulating by a double-screw extruder to prepare the antibacterial master batch.
The invention also provides an antibacterial easy-to-tear moisture absorption packaging structure which comprises the antibacterial easy-to-tear moisture absorption PE film. According to the requirements of customers, the antibacterial uncovering moisture absorption type PE film is directly manufactured or compounded with other film structures to manufacture a corresponding packaging structure, and is applied to packaging of articles such as food, medicines, medical appliances and the like with high antibacterial requirements.
In order to illustrate the invention herein, specific examples are set forth below. It should be understood that these examples are for illustrative purposes only and are not to be construed as limiting the invention in any way.
Example 1
The raw material components, the dosage and the thickness of each layer of the antibacterial easy-uncovering moisture absorption type PE film are shown in the table I. Specifically, the outer layer raw material comprises 79.7Kg of 2420H type low density polyethylene, 20Kg of Sicocidae 0220A linear low density polyethylene, and 0.3Kg of Schelman AMF705HF fluorine-containing processing aid. The material of the moisture absorption layer is 200Kg of moisture absorption master batch; the weight ratio of the zeolite molecular sieve moisture absorbent, the low density polyethylene and the linear low density polyethylene in the moisture absorption master batch is 3: 2: 1. 55.7Kg of Catal FD0274 low density polyethylene, 25Kg of 0220KG linear low density polyethylene, 15Kg of Basel PB-8640M easy-release particles, 3Kg of antibacterial master batch, 1Kg of opening agent EAZ-10, and 0.3Kg of Schelman AMF705HF fluorine-containing processing aid are used as the antibacterial easy-release layer; the weight ratio of the nano modified ZnO inorganic antibacterial agent, the low density polyethylene and the linear low density polyethylene in the antibacterial master batch is 3: 12: 5.
and respectively adding the materials of each layer into each charging barrel of a three-layer co-extrusion film blowing machine, heating and melting, shearing and plasticizing, extruding and blowing the film, cooling by a wind ring, carrying out corona annealing, cutting and rolling into a roll film, and thus obtaining the antibacterial easy-uncovering moisture absorption type PE film.
Watch 1
Example 2
The raw material components and the use amount of each layer of the antibacterial easy-to-tear moisture absorption type PE film are the same as those of the embodiment 1, and the film thicknesses of the outer layer, the moisture absorption layer and the antibacterial easy-to-tear layer are respectively 20 micrometers, 40 micrometers and 20 micrometers. The preparation method of the antibacterial easy-uncovering moisture absorption type PE film of the embodiment is the same as that of the antibacterial easy-uncovering moisture absorption type PE film of the embodiment 1.
Example 3
The raw material components and the thicknesses of the layers of the antibacterial easy-uncovering moisture absorption type PE film are the same as those of the example 1, and the contents of the easy-uncovering particles, the low density polyethylene and the linear low density polyethylene are different from those of the example 1. The preparation method of the antibacterial easy-uncovering moisture absorption type PE film of the embodiment is the same as that of the antibacterial easy-uncovering moisture absorption type PE film of the embodiment 1.
The raw material components, the dosage and the thickness of each layer of the antibacterial easy-uncovering moisture absorption type PE film are shown in the second table.
Watch two
Example 4
The raw material components and the thicknesses of the layers of the antibacterial easy-uncovering moisture absorption type PE film are the same as those of the example 1, and the contents of the easy-uncovering particles, the low density polyethylene and the linear low density polyethylene are different from those of the example 1. The preparation method of the antibacterial easy-uncovering moisture absorption type PE film of the embodiment is the same as that of the antibacterial easy-uncovering moisture absorption type PE film of the embodiment 1.
The raw material components, the dosage and the thickness of each layer of the antibacterial easy-uncovering moisture absorption type PE film are shown in the third table.
Watch III
Example 5
The raw material components and the film thickness of each layer of the antibacterial easy-uncovering moisture absorption type PE film are the same as those of the embodiment 1, and the contents of the easy-uncovering particles, the low density polyethylene, the linear low density polyethylene and the antibacterial master batch are different from those of the embodiment 1. The preparation method of the antibacterial easy-uncovering moisture absorption type PE film of the embodiment is the same as that of the antibacterial easy-uncovering moisture absorption type PE film of the embodiment 1.
The raw material components, the dosage and the thickness of each layer of the antibacterial easy-uncovering moisture absorption type PE film are shown in the fourth table.
Watch four
Example 6
The components, the using amount and the thickness of each layer of the antibacterial easy-uncovering moisture absorption type PE film are the same as those of the embodiment 1, and the proportion of each raw material in the moisture absorption master batch is different from that of the embodiment 1. In the embodiment, the weight ratio of the zeolite molecular sieve moisture absorbent, the low density polyethylene and the linear low density polyethylene in the moisture absorption master batch is 1.5: 4: 2. the preparation method of the antibacterial easy-uncovering moisture absorption type PE film of the embodiment is the same as that of the antibacterial easy-uncovering moisture absorption type PE film of the embodiment 1.
Example 7
The components, the using amount and the thickness of each layer of the antibacterial easy-uncovering moisture absorption type PE film are the same as those of the embodiment 1, and the proportion of each raw material in the antibacterial master batch is different from that of the embodiment 1. In the antibacterial master batch of the embodiment, the weight ratio of the nano modified ZnO inorganic antibacterial agent to the low density polyethylene to the linear low density polyethylene is 2.5: 12: 5. the preparation method of the antibacterial easy-uncovering moisture absorption type PE film of the embodiment is the same as that of the antibacterial easy-uncovering moisture absorption type PE film of the embodiment 1.
Example 8
The components, the using amount and the thickness of each layer of the antibacterial easy-uncovering moisture absorption type PE film are the same as those of the embodiment 1, and the proportion of each raw material in the antibacterial master batch is different from that of the embodiment 1. In the antibacterial master batch of the embodiment, the weight ratio of the nano modified ZnO inorganic antibacterial agent to the low density polyethylene to the linear low density polyethylene is 5: 12: 5. the preparation method of the antibacterial easy-uncovering moisture absorption type PE film of the embodiment is the same as that of the antibacterial easy-uncovering moisture absorption type PE film of the embodiment 1.
Comparative example 1
The raw material components and the thicknesses of all the layers of the PE film in the comparative example are the same as those in example 2, the dosage of the easy-uncovering particles is 5Kg, and the dosages of the raw materials of other layers are the same as those in example 2. The preparation method of the PE film of this comparative example was the same as that of the antibacterial easy-release moisture absorption PE film of example 1.
Comparative example 2
The raw material components and the thicknesses of all the layers of the PE film of the comparative example are the same as those of the PE film of the example 2, the dosage of the easy-uncovering particles is 25Kg, and the dosages of the raw materials of other layers are the same as those of the PE film of the example 2. The preparation method of the PE film of this comparative example was the same as that of the antibacterial easy-release moisture absorption PE film of example 1.
Example 9
The product performance of the PE films prepared in examples 1 to 8 and comparative examples 1 and 2 was examined; wherein, tensile strength detects according to GB13022, elongation at break detects according to GB13022, coefficient of friction detects according to GB10006, and heat-seal strength detects according to the enterprise standard, and antibiotic rate detects according to the national standard, and saturated moisture absorption volume, residual moisture absorption rate detect according to the enterprise standard. The detection results are shown in the fifth table.
Watch five
As can be seen from the table five, the antibacterial easy-uncovering moisture absorption type PE film provided by the invention has excellent antibacterial performance, moisture absorption performance and easy-uncovering performance. Specifically, the self-sealing strength of the antibacterial easy-to-uncover moisture-absorption PE films of embodiments 1 to 8 is 3.2 to 8.8N/15mm, the seal after heat sealing is easy to uncover, no chips fall off, and the film has a certain heat sealing strength and is stable in heat sealing. The residual dilution rate of the antibacterial easy-uncovering moisture absorption type PE film after 90min is as high as 94%, and the moisture absorption performance is good. In comparative example 1, the low content of easy-to-uncover particles resulted in a high self-sealing strength of the prepared PE film, which was not easy to uncover. In comparative example 2, the self-sealing strength of the prepared PE film is too low due to the high content of the easy-to-tear particles, and the PE film is not easy to be heat-sealed.
The foregoing is merely a preferred embodiment of the invention and is not intended to limit the invention in any manner; those skilled in the art should appreciate that they can readily use the disclosed conception and specific embodiments as a basis for designing or modifying other structures for carrying out the same purposes of the present invention without departing from the scope of the invention as defined by the appended claims; meanwhile, any changes, modifications, and evolutions of the equivalent changes of the above embodiments according to the actual techniques of the present invention are still within the protection scope of the technical solution of the present invention.
Claims (10)
1. The utility model provides an antibiotic easy tearing moisture absorption type PE membrane which characterized in that includes from outside to inside in proper order:
the outer layer is used for printing or compounding, and the raw materials comprise the following components in percentage by weight: 1 of low density polyethylene, linear low density polyethylene;
the moisture absorption layer is made of moisture absorption master batches;
the antibacterial easy-uncovering layer comprises the following raw materials of antibacterial master batch, an opening agent and a mixture of 1: 1-3: 3-7 easy-to-tear particles, linear low density polyethylene and low density polyethylene; wherein the release particles are incompatible with linear low density polyethylene and low density polyethylene; the addition amount of the antibacterial master batch and the addition amount of the opening agent are respectively 1-5% and 1-3% of the total weight of the raw materials of the antibacterial easy-uncovering layer.
2. The PE film as claimed in claim 1, wherein the moisture-absorbing masterbatch comprises a moisture-absorbing agent and a solvent in a weight ratio of 5: 1 to 3 of low density polyethylene, linear low density polyethylene; the moisture absorbent accounts for 20-50% of the total weight of the moisture absorbent master batch.
3. The anti-microbial easy-uncovering moisture absorption type PE film according to claim 2, wherein the moisture absorbent is zeolite molecular sieve moisture absorbent; the linear low-density polyethylene of the moisture-absorbing master batch is metallocene linear low-density polyethylene.
4. The antibacterial easy-uncovering moisture absorption type PE film according to claim 1, wherein the antibacterial masterbatch comprises the following components in a weight ratio of 2.5-5: 12: 5, low density polyethylene, linear low density polyethylene.
5. The PE film as claimed in claim 4, wherein the antibacterial agent is a modified nano ZnO inorganic antibacterial agent; the easy-uncovering particles are PB-1 particles.
6. The PE film of claim 1, wherein the outer layer further comprises 0.27-0.33 wt% of a fluorine-containing processing aid;
and/or the antibacterial easy-uncovering layer also comprises a fluorine-containing processing aid with the weight content of 0.27-0.33%.
7. The PE film as claimed in claim 1, wherein the outer layer has a thickness of 10-20 μm; the thickness of the moisture absorption layer is 20-60 mu m; the thickness of the antibacterial easy-uncovering layer is 15-30 mu m.
8. A method for producing the antibacterial easy-release moisture absorption type PE film according to any one of claims 1 to 7, comprising the steps of: and adding the raw materials of the outer layer, the moisture absorption layer and the antibacterial easy-uncovering layer into corresponding charging barrels of a three-layer co-extrusion film blowing machine respectively according to a ratio, and performing three-layer co-extrusion blow molding to obtain the antibacterial easy-uncovering moisture absorption type PE film.
9. The method of claim 8, further comprising the steps of:
uniformly mixing a moisture absorbent, low-density polyethylene and linear low-density polyethylene according to a ratio, and then blending, extruding and granulating to obtain moisture-absorbing master batches;
the antibacterial agent, the low-density polyethylene and the linear low-density polyethylene are uniformly mixed according to the proportion and then are blended, extruded and granulated to obtain the antibacterial master batch.
10. An antibacterial, easy-to-tear, moisture-absorbing packaging structure comprising the antibacterial, easy-to-tear, moisture-absorbing PE film according to any one of claims 1 to 7.
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