CN113815280A - Easily-recycled high-barrier low-temperature heat-seal packaging composite film and production method thereof - Google Patents
Easily-recycled high-barrier low-temperature heat-seal packaging composite film and production method thereof Download PDFInfo
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- 239000002131 composite material Substances 0.000 title claims abstract description 76
- 238000004806 packaging method and process Methods 0.000 title claims abstract description 46
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 7
- 239000010410 layer Substances 0.000 claims abstract description 118
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 34
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- -1 polypropylene Polymers 0.000 claims abstract description 20
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- 239000011347 resin Substances 0.000 claims abstract description 20
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- 239000012793 heat-sealing layer Substances 0.000 claims abstract description 15
- 230000004888 barrier function Effects 0.000 claims abstract description 12
- 229920000642 polymer Polymers 0.000 claims abstract description 12
- 125000004369 butenyl group Chemical group C(=CCC)* 0.000 claims abstract description 11
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- 239000003795 chemical substances by application Substances 0.000 claims abstract description 10
- 238000005269 aluminizing Methods 0.000 claims abstract description 8
- 238000013329 compounding Methods 0.000 claims abstract description 8
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- 238000004064 recycling Methods 0.000 claims abstract description 8
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—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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- 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
- B32B38/00—Ancillary operations in connection with laminating processes
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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
- B32B38/00—Ancillary operations in connection with laminating processes
- B32B38/14—Printing or colouring
- B32B38/145—Printing
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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
- 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
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- 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
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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
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- B32B2250/24—All layers being polymeric
- B32B2250/242—All polymers belonging to those covered by group B32B27/32
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/30—Properties of the layers or laminate having particular thermal properties
- B32B2307/31—Heat sealable
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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
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/724—Permeability to gases, adsorption
- B32B2307/7242—Non-permeable
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2553/00—Packaging equipment or accessories not otherwise provided for
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- 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
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/80—Packaging reuse or recycling, e.g. of multilayer packaging
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Laminated Bodies (AREA)
Abstract
The invention relates to the field of packaging, in particular to an easily-recycled high-barrier low-temperature heat-seal packaging composite film and a production method thereof. This complex film is formed by printing film and the compounding of aluminizing curtain coating polypropylene film VMCPP, and the curtain coating polypropylene film VMCPP of aluminizing is four-layer structure: the first layer is an aluminum layer, and the printing film is compounded on the surface of the aluminum layer; the second layer is a composite layer and is composed of a copolymer PP resin and maleic anhydride grafted POE; the third layer is a middle layer and is made of homopolymerized polypropylene resin; the fourth layer is a heat sealing layer and is composed of a metallocene-based polypropylene random copolymer, a butenyl polymer and a shedding agent. The composite film is a single polyolefin composite film, is easy to melt and recycle, has high recycling value, has the advantages of high barrier property, low-temperature heat sealing and high heat sealing strength, and can well meet the requirements of high-barrier and high-speed packaging.
Description
Technical Field
The invention relates to the field of packaging, in particular to an easily-recycled high-barrier low-temperature heat-seal packaging composite film and a production method thereof.
Background
The high-barrier packaging usually adopts aluminum foil and VMPET materials as barrier layers, and the barrier layers and polyolefin heat-seal layer films are compounded to form a packaging composite film. The packaging composite film has aluminum foil or polyester material, and the heating melting mode recovers the granulation phase tolerance, can not be recycled, and does not meet the requirements of the current environment-friendly materials.
In the prior art, a single type of polyolefin material is adopted for the packaging composite film, the recycling value of the packaging composite film is high, the recycling rate of a polymer product can be improved, and a disposable energy base material can be effectively saved. However, although the single type of polyolefin packaging composite film meets the requirements of environment-friendly materials, the barrier property is difficult to approach to aluminum foil and VMPET materials.
Disclosure of Invention
In order to solve the problems in the prior art, an object of the present invention is to provide an easily recyclable high-barrier low-temperature heat-seal packaging composite film, which has the advantages of high barrier property, low-temperature heat seal, and high heat-seal strength, and can meet the requirements of high-barrier high-speed packaging.
The technical scheme adopted by the invention is as follows:
the utility model provides an easily retrieve high separation low temperature heat-seal packaging complex film, this complex film is formed by printing film and the compounding of casting polypropylene film VMCPP of aluminizing, casting polypropylene film VMCPP of aluminizing is four-layer structure:
the first layer is an aluminum layer, and the printing film is compounded on the surface of the aluminum layer;
the second layer is a composite layer and is composed of two raw materials of copolymerized PP resin and maleic anhydride grafted POE;
the third layer is a middle layer and is made of homopolymerized polypropylene resin;
the fourth layer is a heat sealing layer and is composed of three raw materials of a metallocene-based polypropylene random copolymer, a butenyl polymer and a shedding agent.
Preferably, the printed film is a biaxially oriented polypropylene film BOPP or a cast polypropylene film CPP or a polyethylene film PE, and the thickness of the printed film is 18-38 μm.
Preferably, a glue layer compounded on the aluminum layer, or a glue layer and an ink layer compounded on the aluminum layer in sequence are further included between the contact surfaces of the printing film and the aluminum-plated cast polypropylene film VMCPP.
Preferably, the glue layer uses DIC brand VM001 blocking glue, and the gluing amount is 3.5-4.5 gsm.
Preferably, in the aluminized cast polypropylene film VMCPP, the homopolymerized polypropylene resin used in the middle layer is a Bolu petrochemical brand HD915 homopolymerized polypropylene resin.
Preferably, in the aluminized cast polypropylene film VMCPP, the raw materials of the composite layer and the heat seal layer are as follows according to the weight percentage: the composite layer is composed of 80% of copolymerized PP resin and 20% of maleic anhydride grafted POE; the heat sealing layer is composed of three raw materials of 60% of metallocene-based polypropylene random copolymer, 37% of butenyl polymer and 3% of opening agent.
Preferably, the copolymerized PP resin is a bolu petrochemical brand RD265 copolymerized resin, the maleic anhydride grafted POE is a japan mitsui chemical brand MA9015 maleic anhydride grafted POE, the metallocene-based polypropylene random copolymer is a japan mitsui chemical brand WFX4TA random copolymer, the butenyl polymer is a japan mitsui chemical brand BL2491 butenyl polymer, and the opener is a brood brand ABPP10S opener masterbatch.
Preferably, the thickness of the VMCPP of the aluminized cast polypropylene film is 18-40 μm, wherein the thickness of the composite layer is 3-5 μm, the thickness of the intermediate layer is 10-27 μm, and the thickness of the heat sealing layer is 5-8 μm.
The invention also aims to provide a production method of the easily-recycled high-barrier low-temperature heat-seal packaging composite film, which comprises the following steps:
s1, preparing raw materials of a VMCPP composite layer, an intermediate layer and a heat sealing layer of the aluminized cast polypropylene film respectively according to a proportion, putting the raw materials into a mixer for uniform mixing, and then co-extruding and blowing the film by an extruder according to the arrangement sequence of the composite layer, the intermediate layer and the heat sealing layer to prepare a composite CPP co-extruded film;
s2, bombarding the composite CPP co-extrusion film by using low-temperature plasma, and then evaporating aluminum on the surface of a composite layer of the composite CPP co-extrusion film to obtain an aluminized cast polypropylene film VMCPP;
and S3, compounding the printing film on the surface of the aluminum layer of the aluminized cast polypropylene film VMCPP to obtain the easily-recycled high-barrier low-temperature heat-seal packaging composite film.
Preferably, the step between S2 and S3 further includes: and coating glue between the aluminum layer of the aluminized cast polypropylene film VMCPP and the printing film to form a glue layer, and selecting to print or not print ink on the surface of the glue layer according to requirements.
The invention has the beneficial effects that:
several high-barrier packages used in the prior art have certain defects, for example, if various materials are compounded, the obtained composite film cannot be melted and recycled, and has no recycling value; the low-temperature heat-sealing CPP film modified by the elastomer or the plastomer of the vinyl (POE) and the propenyl (POP) has low heat-sealing strength; and the single polyolefin BOPP/VMCPP has poor barrier property. The BOPP/VMCPP film in the prior art has the heat sealing temperature of 135 ℃ or above, the heat sealing strength of 10-15N/15mm and the moisture permeability of 0.5-1gm/m224h oxygen permeability of 10-50cc/m224h, the effect is poor.
The invention successfully develops the easily-recycled high-barrier low-temperature heat-seal packaging compound through the CPP film formula design and the innovation of the vacuum aluminum plating process and the compound processThe composite film is a single polyolefin composite film, is easy to melt and recycle and has high recycling value. The composite film has the advantages of high barrier property, low-temperature heat sealing and high heat sealing strength, and the composite film has good heat sealing performance at 115 ℃, the heat sealing strength is 15-20N/15mm, and the moisture permeability is less than 0.5gm/m224h oxygen transmission less than 1cc/m2And 24h, the requirements of high-barrier and high-speed packaging can be well met.
The prepared composite packaging film has good application effect on high-speed filling packaging, can be well applied to high-speed packaging of milk slices, candies, biscuits and the like and inflatable cake packaging, can shorten the packaging sealing time by low-temperature high-strength heat sealing, can improve the packaging speed by 30 percent compared with the packaging composite film in the prior art, can reduce the bag bursting reject ratio caused by insufficient heat sealing strength by 50 percent, and can also meet the environmental protection requirement of easy recycling.
Drawings
FIG. 1 is a schematic diagram of the structure of a packaging composite film of the present invention;
FIG. 2 is a schematic flow chart of the process for making the packaging composite film of the present invention.
The notations in the figures have the following meanings:
10-printing film 20-ink layer 30-glue layer
40-aluminum-plated cast polypropylene film 41-aluminum layer 42-composite layer 43-intermediate layer 44-heat sealing layer
Detailed Description
The technical solutions of the present invention are described below with reference to the drawings and examples of the specification so as to facilitate understanding for those skilled in the art.
Example 1
As shown in figure 1, the easily-recycled high-barrier low-temperature heat-seal packaging composite film is formed by compounding a printing film 10 and an aluminized cast polypropylene film 40, wherein the printing film 10 is a biaxially oriented polypropylene film BOPP or a cast polypropylene film CPP or a polyethylene film PE. The aluminized cast polypropylene film 40(VMCPP) is a four-layer structure:
the first layer is an aluminum layer 41, and the printing film 10 is compounded on the surface of the aluminum layer 41;
the second layer is a composite layer 42 which is composed of 80 wt% of Boropetrochemical Borouge No. RD265 copolymerized PP resin and 20 wt% of Japan Tri-well chemical No. MA9015 maleic anhydride grafted POE. Since the aluminum layer 41 is attached to the composite layer 42, it is necessary to have high corona treatability and high adhesion strength of the aluminum layer 41, and the lower the content of small molecules in the resin, the better. The raw materials are blended by RD265 copolymerized PP resin without a slip agent and calcium stearate and MA9015 maleic anhydride grafted ethylene-butylene copolymer resin with high polarity, the surface of a film produced by the blended raw materials is suitable for vacuum aluminum plating, and an aluminum layer 41 after aluminum plating is good in compactness and high in adhesion fastness and can reach 1.0-1.3N/15 mm.
The third layer is a middle layer 43 which is made of Borough petrochemical Boroughe brand HD915 homopolymerized polypropylene resin. The resin has high crystallinity and good rigidity, and can provide good high rigidity and high temperature resistance for the film structure in the invention.
The fourth layer is a heat sealing layer 44 which is composed of three raw materials of 60 wt% of Japanese JPP brand WFX4TA metallocene-based polypropylene random copolymer, 37 wt% of Japanese Mitsui chemical brand BL2491 butenyl-based polymer and 3 wt% of Baolide brand ABPP10S opening agent master batch. The heat-seal layer 44 in the composite film needs to ensure good compatibility or dispersion among the blended resins, cannot peel off with low strength per se, and also needs to have good compatibility with the middle layer 43, so that the heat-seal layer is not layered during heat-seal peeling; the lower melting point reduces the temperature requirement during heat sealing. Therefore, the metallocene PP copolymer with a lower melting point is selected to be blended with the butenyl polymer in the heat sealing layer 44, and an opening agent is added to improve the rolling performance of the composite film. The finally obtained blended resin has excellent micro-dispersion effect, the integral melting point is reduced by about 20 ℃ compared with the ternary polymerization PP resin in the prior art, and the use requirement is met.
In this embodiment, the contact surface between the printing film 10 and the aluminum-plated cast polypropylene film 40 further includes a glue layer 30 and an ink layer 20 sequentially compounded on the aluminum layer 41. Wherein the glue layer 30 uses DIC brand VM001 to block glue, the glue amount is 3.5-4.5gsm, the glue layer 30 can improve the barrier property of the composite film, and especially the oxygen resistance is obviously improved.
The raw material performance parameters used for each layer in this example are shown in table 1:
table 1 raw materials using particle parameters
| Number plate | Manufacturer of the product | Key performance parameters (melting point ℃; melt index g/10 min; density g/cm)3) |
| WFX4TA | JPP | Tm：125；MFR：7.0；ρ：0.900 |
| RD265 | Borouge | Tm：151；MFR：8.0；ρ：0.905 |
| HD915 | Borouge | Tm：167；MFR：8.0；ρ：0.905 |
| BL2491 | Three-well | Tm：100；MFR：4.0；ρ：0.921 |
| MA9015 | Three-well | Tm：77；MFR：11.0；ρ：0.896 |
| ABPP10S | Boride- | Silicon oxide opening agent |
In this embodiment, the thickness of the printing film 10 is 18-38 μm, and the thickness of the aluminized cast polypropylene film 40(VMCPP) is 18-40um, wherein the thicker the composite layer 42 is, the poorer the thermal conductivity is, and the thickness is generally 3-5 μm; the thickness of the middle layer 43 accounts for the maximum ratio of the total thickness of the film, is a mechanical strength layer and a temperature-resistant layer for improving the film, and is 10-27 mu m; the heat-seal layer 44 has a thickness of 5 to 8 μm.
Example 2
As shown in fig. 2, the production method of the packaging composite film in example 1 includes the following steps:
s1, preparing raw materials of an aluminized cast polypropylene film composite layer 42, an intermediate layer 43 and a heat sealing layer 44 in proportion, putting the raw materials into a mixer, uniformly mixing, and co-extruding and film blowing by using an extruder according to the arrangement sequence of the composite layer 42, the intermediate layer 43 and the heat sealing layer 44 to prepare a cast polypropylene film CPP;
the processing parameters in this section are specifically seen in table 2:
TABLE 2 casting Polypropylene film CPP processing parameters
S2, bombarding the casting polypropylene film CPP by using low-temperature plasma, and evaporating aluminum on the surface of the composite layer 42 of the casting polypropylene film CPP to obtain the aluminized casting polypropylene film 40 (VMCPP).
Before the cast polypropylene film CPP is contacted with aluminum steam, low-temperature plasma is utilized to carry out bombardment treatment on the surface of the film, so that the polarity of the surface of the composite layer 42 can be improved, meanwhile, small molecular substances possibly adhered or separated out on the surface of the composite layer 42 are removed, and the dense distribution and the increased adhesion fastness of the aluminum layer 41 are promoted. The parameters of the aluminizing process are detailed in the following table 3:
table 3 parameters of the aluminizing process:
| electric current | Oxygen gas | Argon gas | Optical density | Speed of rotation |
| A | sccm | sccm | OD value | m/s |
| 16 | 200 | 800 | 2.4～2.7 | 5 |
S3, coating glue between the aluminum layer 41 of the aluminized cast polypropylene film 40 and the printing film 10 to form a glue layer 30, and printing ink on the surface of the glue layer to form an ink layer 20.
DIC corporation brand VM001 is used for blocking glue, and the technological parameters are as follows: the sizing amount is 3.5-4.5gsm, and the anilox roller is 110 lines multiplied by 70 um.
S4, compounding the printing film on the surface of the aluminum layer 41 of the aluminized cast polypropylene film 40 at the compounding speed of 110-130m/min, at the curing temperature of 40-45 ℃ and for the curing time of 48-36 h. Thus obtaining the easily-recycled high-barrier low-temperature heat-seal packaging composite film.
Example 3
The properties of the composite films were tested after combining a 19 μm thick BOPP film with a 35 μm aluminized cast polypropylene film 40 in the manner of example 2 at a heat seal pressure of 180KPa for a heat seal time of 1s, with the results shown in the following table:
table 4 comparison of heat sealability of the inventive packaging composite film to the prior art composite film
TABLE 5 comparison of the Performance of the packaging composite films of the present invention with the Prior Art composite films
As can be seen from the above table, the packaging composite film prepared by the invention has better heat sealing performance at 115 ℃, the heat sealing strength is 15-20N/15mm, and the moisture permeability of the composite film is less than 0.5gm/m224h oxygen transmission less than 1cc/m224h, which is far superior to other packaging composite films and can well meet the requirements of high-barrier and high-speed packaging.
The above is only a preferred embodiment of the invention, and is not intended to limit the invention; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art that: any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides an easily retrieve high separation low temperature heat-seal packaging complex film which characterized in that, this complex film is formed by printing film and the compounding of casting polypropylene film VMCPP of aluminizing, casting polypropylene film VMCPP of aluminizing is four-layer structure:
the first layer is an aluminum layer, and the printing film is compounded on the surface of the aluminum layer;
the second layer is a composite layer and is composed of two raw materials of copolymerized PP resin and maleic anhydride grafted POE;
the third layer is a middle layer and is made of homopolymerized polypropylene resin;
the fourth layer is a heat sealing layer and is composed of three raw materials of a metallocene-based polypropylene random copolymer, a butenyl polymer and a shedding agent.
2. An easily recyclable high barrier low temperature heat seal packaging composite film according to claim 1, wherein the printed film is biaxially oriented polypropylene film BOPP or cast polypropylene film CPP or polyethylene film PE, and the thickness of the printed film is 18-38 μm.
3. The easy-recycling high-barrier low-temperature heat-seal packaging composite film according to claim 2, wherein a glue layer compounded on the aluminum layer or a glue layer and an ink layer compounded on the aluminum layer in sequence is further included between the contact surfaces of the printing film and the aluminized cast polypropylene film VMCPP.
4. An easily recyclable high barrier low temperature heat seal packaging composite film according to claim 3 wherein the glue layer is a 3.5 to 4.5gsm glue using DIC brand VM001 barrier glue.
5. The easily recyclable high-barrier low-temperature heat-seal packaging composite film according to claim 1, wherein in the aluminized cast polypropylene film VMCPP, the homo-polypropylene resin used in the middle layer is a Bolu petrochemical brand HD915 homo-polypropylene resin.
6. The easily-recycled high-barrier low-temperature heat-seal packaging composite film according to claim 1, wherein in the aluminized cast polypropylene film VMCPP, the composite layer and the heat-seal layer are prepared from the following raw materials in percentage by weight: the composite layer is composed of 80% of copolymerized PP resin and 20% of maleic anhydride grafted POE; the heat sealing layer is composed of three raw materials of 60% of metallocene-based polypropylene random copolymer, 37% of butenyl polymer and 3% of opening agent.
7. The easy-recycling high-barrier low-temperature heat-seal packaging composite film as claimed in claim 6, wherein the PP copolymer resin is a Bolu petrochemical brand RD265 PP copolymer resin, the maleic anhydride grafted POE is a Japan Mitsui chemical brand MA9015 maleic anhydride grafted POE, the metallocene-based polypropylene random copolymer is a Japan JPP brand WFX4TA random copolymer, the butenyl polymer is a Japan Mitsui chemical brand BL2491 butenyl polymer, and the opening agent is a Baolide brand ABPP10S opening agent masterbatch.
8. An easily recyclable high-barrier low-temperature heat-seal packaging composite film according to any one of claims 1 to 7, wherein the VMCPP thickness of the aluminized cast polypropylene film is 18-40 μm, the composite layer thickness is 3-5 μm, the intermediate layer thickness is 10-27 μm, and the heat-seal layer thickness is 5-8 μm.
9. A method for producing an easily recyclable high barrier low temperature heat seal packaging composite film according to claim 8, comprising the steps of:
s1, preparing raw materials of a VMCPP composite layer, an intermediate layer and a heat sealing layer of the aluminized cast polypropylene film respectively according to a proportion, putting the raw materials into a mixer for uniform mixing, and then co-extruding and blowing the film by an extruder according to the arrangement sequence of the composite layer, the intermediate layer and the heat sealing layer to prepare a composite CPP co-extruded film;
s2, bombarding the composite CPP co-extrusion film by using low-temperature plasma, and then evaporating aluminum on the surface of a composite layer of the composite CPP co-extrusion film to obtain an aluminized cast polypropylene film VMCPP;
and S3, compounding the printing film on the surface of the aluminum layer of the aluminized cast polypropylene film VMCPP to obtain the easily-recycled high-barrier low-temperature heat-seal packaging composite film.
10. The method of claim 9, further comprising, between steps S2 and S3: and coating glue between the aluminum layer of the aluminized cast polypropylene film VMCPP and the printing film to form a glue layer, and selecting to print or not print ink on the surface of the glue layer according to requirements.
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