WO2020177220A1 - 一种可回收聚烯烃金属化复合膜及其制备方法 - Google Patents

一种可回收聚烯烃金属化复合膜及其制备方法 Download PDF

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WO2020177220A1
WO2020177220A1 PCT/CN2019/087726 CN2019087726W WO2020177220A1 WO 2020177220 A1 WO2020177220 A1 WO 2020177220A1 CN 2019087726 W CN2019087726 W CN 2019087726W WO 2020177220 A1 WO2020177220 A1 WO 2020177220A1
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Prior art keywords
film
polyolefin
layer
metallized
composite film
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PCT/CN2019/087726
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English (en)
French (fr)
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章育骏
章澄
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南京沪江复合材料股份有限公司
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Priority to EP19856437.9A priority Critical patent/EP3733408B1/en
Publication of WO2020177220A1 publication Critical patent/WO2020177220A1/zh

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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • 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
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
    • B65D65/38—Packaging materials of special type or form
    • B65D65/40—Applications of laminates for particular packaging purposes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2255/00—Coating on the layer surface
    • B32B2255/10—Coating on the layer surface on synthetic resin layer or on natural or synthetic rubber 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
    • B32B2255/20—Inorganic coating
    • B32B2255/205—Metallic 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
    • 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
    • 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

Definitions

  • the invention relates to the technical field of flexible packaging, in particular to a recyclable polyolefin metalized composite film and a preparation method thereof.
  • Metallized film is a commonly used barrier film in the field of flexible packaging. It has both the characteristics of plastic film and metal. It is a cheap and beautiful packaging material with excellent performance and strong practicability. It is often used for its excellent cost performance. Replace metal films (such as aluminum foil) in the field of metalized composite films.
  • the metalized composite film is based on the metalized film, and then composite films of other materials are combined to form a composite film to achieve performance that cannot be achieved by a single-layer metalized film.
  • the traditional metalized composite film generally uses CPP aluminized film, OPP aluminized film or PET aluminized film as the metalized film layer, and then composite PET, PA, PP, PE and other film layers to form a multilayer composite film structure.
  • the metalized composite film has excellent performance, it has brought about the problems of difficulty in recycling and environmental protection. Because the materials of each composite membrane are inconsistent, it is difficult to separate, and the cost is very high if it is to be recycled, and the recycling can only be abandoned.
  • metalized composite films are widely used.
  • the traditional metallized composite film used for heavy-duty bags cannot be regarded as a single material because of the large difference in the material of each film layer and poor compatibility, and cannot be recycled and reused. Therefore, it is necessary to develop a metalized composite film that can be recycled and reused in the field of heavy bags.
  • the purpose of the present invention is to provide a recyclable polyolefin metalized composite film used in the field of heavy bags and a preparation method thereof in view of the problems existing in the prior art.
  • a recyclable polyolefin metallized composite film comprising a polyolefin metallized film layer and a polyethylene film layer; the polyolefin metallized film layer is composed of a polyolefin substrate film layer and a metal coating, and the polyolefin base
  • the material film layer is a three-layer composite film structure, from top to bottom, the outer layer of the substrate film, the middle layer of the substrate film, and the inner layer of the substrate film. The thickness of each layer is equal; the metal coating is applied to the The lower surface of the inner layer of the substrate film, and the lower surface of the metal coating layer is compounded with the polyethylene film layer through an adhesive.
  • the polyolefin substrate film layer is formed by co-extruding the outer layer, the middle layer and the inner layer by three screw extruders through blow molding on a die, and the raw materials of the three layers are composed as follows:
  • Base film outer layer 1 20%-30% polyolefin resin A, 70%-80% polyolefin resin B;
  • Base film middle layer 2 40%-60% polyolefin resin A, 40%-60% polyolefin resin B;
  • Base film inner layer 3 20%-30% polyolefin resin A, 70%-80% polyolefin resin B;
  • polyolefin resin A is a copolymer of propylene and ethylene monomer, the molar content of the ethylene monomer in the copolymer is 2%-20%, the density is 0.86g/cm 3 -0.91g/cm 3 , and the melting point is 135 °C -168 °C;
  • polyolefin resin B is a C6 or C8 metallocene polyethylene having a density of 0.90g / cm 3 -0.94g / cm 3 , a melting point of 96 °C -128 °C.
  • the total thickness of the polyolefin metallized composite film is 90-170 ⁇ m.
  • the thickness of the metal coating is 50-60 nm, and the metal material is aluminum.
  • the adhesive is polyurethane glue.
  • the present invention also protects a method for preparing a recyclable polyolefin metallized composite film, the preparation method is as follows:
  • step 1) Take the polyolefin substrate film prepared in step 1) and send it to a vacuum aluminum plating machine, and coat a metal aluminum coating 4 on the corona surface of the inner layer 3 of the substrate film to prepare a polyolefin metalized film layer ;
  • the polyolefin metallized film and polyethylene film prepared in step 2) are compounded with polyurethane adhesive on a dry laminating machine to make a polyolefin metallized composite film, which is used as a heavy bag after being cured and standing material.
  • the process conditions for corona treatment of the inner layer 3 of the substrate film are: the corona current is 4 amperes, and the dyne water with a dyne value of 42 does not shrink in 2 seconds. .
  • the vacuum aluminum plating process conditions are: the coiling speed is 250-350m/min; the aluminum feeding speed is 0.5-1m/min; the vacuum degree is 3-5 Pa, and the vacuum time is less than 20min.
  • the process conditions of the dry compound machine are: compounding speed 120m/min; temperature of drying tunnel: first stage 40°C-50°C, second stage 50°C-55°C, third stage 55-60°C; temperature of hot drum pressure roller is 60°C; pressure of hot drum pressure roller is 0.5MPa-0.6MPa; pressure of rubber roller is 0.4MPa-0.6MPa.
  • the barrier properties, mechanical properties and other properties of the heavy bag prepared by the invention are equivalent to the existing traditional metalized composite film heavy bag, but it avoids the difficulty of recycling the traditional metalized composite film of PET, PP, PA and other materials Defects.
  • the heavy bag made of the material of the present invention enters the recycling system after being used, it can be recycled according to the metalized film of a single plastic component, which avoids the difficulty of recycling caused by the traditional metalized film due to the uneven material composition, and not only reduces Use cost, and reduce the impact on the environment, in line with the requirements of environmental protection.
  • Figure 1 is a schematic diagram of the structure of the polyolefin metallized composite membrane of the present invention.
  • a recyclable polyolefin metallized composite film shown in Figure 1 comprising a polyolefin metallized film layer and a polyethylene film layer 5;
  • the polyolefin metallized film layer is composed of a polyolefin substrate film layer and a metal coating 4 composition
  • the polyolefin base film layer is a three-layer composite film structure, from top to bottom are the base film outer layer 1, the base film middle layer 2 and the base film inner layer 3, the thickness of each layer is equal
  • the metal coating 4 is coated on the lower surface of the inner layer 3 of the substrate film, and the lower surface of the metal coating 4 is compounded with the polyethylene film layer 5 through an adhesive.
  • the polyolefin substrate film layer is co-extruded by three screw extruders to blow the outer layer, the middle layer and the inner layer into a die.
  • the raw materials of the three layers are as follows:
  • Base film outer layer 1 20%-30% polyolefin resin A, 70%-80% polyolefin resin B;
  • Base film middle layer 2 40%-60% polyolefin resin A, 40%-60% polyolefin resin B;
  • Base film inner layer 3 20%-30% polyolefin resin A, 70%-80% polyolefin resin B;
  • polyolefin resin A is a copolymer of propylene and ethylene monomer, the molar content of the ethylene monomer in the copolymer is 2%-20%, the density is 0.86g/cm 3 -0.91g/cm 3 , and the melting point is 135 °C -168 °C;
  • polyolefin resin B is a C6 or C8 metallocene polyethylene having a density of 0.90g / cm 3 -0.94g / cm 3 , a melting point of 96 °C -128 °C.
  • the total thickness of the polyolefin metallized composite film is 90-170 ⁇ m.
  • the thickness of the metal coating 4 is 50-60nm, and the metal material is aluminum; the inner layer 3 of the base film of the polyolefin metallized film base film is corona-treated and then the metal is made by vacuum evaporation method. The vapor deposited on the surface of the film can form a metal coating.
  • the adhesive is polyurethane glue, and a dry compounding process is used during compounding.
  • the corona current is 4 amperes, and the dyne water with a dyne value of 42 will not shrink for 2 seconds.
  • the coiling speed is 300m/min; the aluminum feeding speed is 0.8m/min; the vacuum degree is 4 Pa, and the vacuum time is less than 20min; the substrate film inner layer 3 surface A layer of metal coating 4 is coated, and the thickness of the metal coating 4 is 55 nm to prepare a polyolefin metalized film layer.
  • the metal surface of the polyolefin metallized film and the polyethylene film 5 are compounded with a polyurethane adhesive on a dry laminating machine to make a polyolefin metallized composite film, which can be used as a heavy-duty film after aging and standing. Bag material.
  • the compounding speed is 120m/min; the temperature of the drying tunnel: the first section is 40°C, the second section is 50°C, and the third section is 55°C; the temperature of the hot drum pressure roller is 60°C; the pressure of the hot drum pressure roller is 0.5MPa; The rubber roller pressure is 0.4MPa.
  • the corona current is 4 amperes, and the dyne water with a dyne value of 42 will not shrink for 2 seconds.
  • the coiling speed is 350m/min; the aluminum feeding speed is 1m/min; the vacuum degree is 5 Pa, and the vacuum time is less than 20min; the surface of the inner layer 3 of the substrate film is coated A layer of metal coating 4 is covered, and the thickness of the metal coating 4 is 60 nm to prepare a polyolefin metalized film layer.
  • the metal surface of the polyolefin metallized film and the polyethylene film 5 are compounded with a polyurethane adhesive on a dry laminating machine to make a polyolefin metallized composite film, which can be used as a heavy-duty film after aging and standing. Bag material.
  • the compounding speed is 120m/min; the temperature of the drying tunnel: the first section is 50°C, the second section is 55°C, and the third section is 60°C; the temperature of the hot drum pressure roller is 60°C; the pressure of the hot drum pressure roller is 0.6MPa; The rubber roller pressure is 0.6MPa.

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Abstract

一种可回收聚烯烃金属化复合膜及其制备方法，包括聚烯烃金属化膜层以及聚乙烯膜层（5）；聚烯烃金属化膜基材膜以聚烯烃为原料，采用三层共挤吹塑成型工艺，通过上吹法吹塑而成，聚烯烃金属化膜的金属面与聚乙烯膜层（5）的电晕面采用胶黏剂复合。制备的重包袋制品，其阻隔性能，力学性能等指标与现有传统金属化复合膜重包袋相当，使用完的制品进入回收系统后，还可以按照单一组份金属化膜进行塑料回收再利用，避免了传统金属化复合膜由于各膜层材料组成不同而造成不能回收利用的缺陷，不仅降低了制品的制造成本，而且减小了其对环境的影响，符合绿色环保的要求。

Description

一种可回收聚烯烃金属化复合膜及其制备方法 技术领域
本发明涉及软包装技术领域，具体涉及一种可回收聚烯烃金属化复合膜及其制备方法。
背景技术
金属化膜是软包装领域常用的阻隔膜，它既具有塑料薄膜的特性，又具有金属的特性，是一种廉价美观、性能优良、实用性强的包装材料，以其优良的性价比常常被用来取代金属薄膜(如铝箔)用于金属化复合膜领域。金属化复合膜以金属化膜为基础，再复合其他材质的薄膜组成复合膜，以达到单层金属化膜无法达到的性能。传统的金属化复合膜一般以CPP镀铝膜、OPP镀铝膜或PET镀铝膜为金属化膜层，再复合PET，PA，PP，PE等薄膜层，组成多层复合膜结构。它不仅具有较高的阻隔性，优异的力学性能，同铝箔复合膜相比还具有成本的低廉性，可以在一定程度上取代高阻隔的铝箔复合膜。金属化复合膜虽然性能优异，却带来了回收利用困难、不环保的问题。因为各个复合膜层材质不一致，分离困难，如果要回收利用则成本很高，最终只能放弃回收再利用。
我们知道，普通的单组成的金属化膜通过适当的处理，是可以回收再利用的。从金属化膜回收处理的工艺来看，如果复合膜的各膜层由相容性好、性能相似的不同材质组份组成，就可以近似看成是单一组份组成金属化膜，只要按照普通单一组成金属化膜处理回收再利用，而不需要再考虑各层复合膜部分的材质差异。
在软包装重包袋领域，金属化复合膜被广泛使用。传统的用于重包袋的金属化复合膜由于各膜层材质差异较大，相容性不好，不能近似看做单一材质，不能回收再利用。因此，需要研发一种可用于重包袋领域可回收再利用的金属化复合膜。
发明内容
本发明的目的是针对现有技术中存在的问题，提供了一种用于重包袋领域的可回收聚烯烃金属化复合膜及其制备方法。
本发明是通过以下技术方案实现的：
一种可回收聚烯烃金属化复合膜，包括聚烯烃金属化膜层以及聚乙烯膜层；所述聚烯烃金属化膜层由聚烯烃基材膜层和金属涂层组成，所述聚烯烃基材膜层为三层复合膜结构，由上至下依次为基材膜外层、基材膜中层以及基材膜内层，各层膜的厚度相等；所述金属涂层涂覆于所述基材膜内层的下表面，所述金属涂层的下表面通过胶黏剂与聚乙烯膜层进行复合。
优选的，所述聚烯烃基材膜层是由三台螺杆挤出机将外层、中层以及内层料共挤经模头上吹吹塑成型，所述三层的原料组成如下：
基材膜外层1：20％-30％聚烯烃树脂A，70％-80％聚烯烃树脂B；
基材膜中层2：40％-60％聚烯烃树脂A，40％-60％聚烯烃树脂B；
基材膜内层3：20％-30％聚烯烃树脂A，70％-80％聚烯烃树脂B；
其中，聚烯烃树脂A为丙烯与乙烯单体的共聚物，该共聚物中乙烯单体的摩尔含量为2％-20％，密度为0.86g/cm 3-0.91g/cm 3，熔点为135℃-168℃；聚烯烃树脂B为C6或C8的茂金属聚乙烯，密度为0.90g/cm 3-0.94g/cm 3，熔点为96℃-128℃。
优选的，所述聚烯烃金属化复合膜的总厚度为90-170μm。
优选的，所述金属涂层的厚度为50-60nm，金属材质为铝。
优选的，所述胶黏剂为聚氨酯胶。
本发明还保护一种可回收聚烯烃金属化复合膜的制备方法，制备方法如下：
1).分别在外层料斗、中层料斗以及内层料斗中加入各层需要的原料，混合均匀后，经三层共挤吹膜机用上吹法吹塑形成聚烯烃基材膜；吹膜机在收卷时，开启电晕机，对基材膜内层3的一面进行电晕处理；
2).取步骤1)制备的聚烯烃基材膜送入真空镀铝机中，在基材膜内层3电晕表面涂覆一层金属铝涂层4，制备形成聚烯烃金属化膜层；
3).将步骤2)制备的聚烯烃金属化膜和聚乙烯薄膜在干式复合机上用聚氨酯胶黏剂进行复合，制作成聚烯烃金属化复合膜，经过熟化静置后用作重包袋材料。
进一步的，所述步骤1)中，基材膜内层3进行电晕处理的工艺条件为：电晕电流为4安培，用达因值为42的达因水涂刷时，2秒不收缩。
进一步的，所述步骤2)中，真空镀铝加工工艺条件为：卷取速度为250-350m/min；送铝速度为0.5-1m/min；真空度为3-5帕，抽真空时间小于20min。
进一步的，所述步骤3)中，干式复合机的工艺条件为：复合速度120m/min；烘道温度：第一段40℃-50℃，第二段50℃-55℃，第三段55-60℃；热鼓压辊温度为60℃；热鼓压辊压力为0.5MPa-0.6MPa；压胶辊压力为0.4MPa-0.6MPa。
本发明的有益效果在于：
本发明制备的重包袋，其阻隔性能，力学性能等各项性能与现有传统金属化复合膜重包袋相当，却避免了传统的PET，PP，PA等材质金属化复合膜不易回收利用的缺陷。本发明材料制作的重包袋在使用完进入回收系统后，可以按照单一塑料组份金属化膜进行回收，避免了传统金属化膜由于材料组成不单一而造成的回收困难的问题，不仅降低了使用成本，而且减小了对环境的影响，符合绿色环保的要求。
附图说明
图1是本发明所述聚烯烃金属化复合膜结构示意图。
图中序号，1-基材膜外层，2-基材膜中层，3-基材膜内层，4-金属涂层，5-聚乙烯薄膜。
具体实施方式
下面结合附图和实施例对本发明的发明内容作进一步地说明。
参见图1所示的一种可回收聚烯烃金属化复合膜，包括聚烯烃金属化膜层以及聚乙烯膜层5；所述聚烯烃金属化膜层由聚烯烃基材膜层和金属涂层4组成，所述聚烯烃基材膜层为三层复合膜结构，由上至下依次为基材膜外层1、基材膜中层2以及基材膜内层3，各层膜的厚度相等；所述金属涂层4涂覆于所述基材膜内层3的下表面，所述金属涂层4的下表面通过胶黏剂与聚乙烯膜层5进行复合。
本实施例中，所述聚烯烃基材膜层是由三台螺杆挤出机将外层、中层以及内层料共挤经模头上吹吹塑成型，三层的原料组成如下：
基材膜外层1：20％-30％聚烯烃树脂A，70％-80％聚烯烃树脂B；
基材膜中层2：40％-60％聚烯烃树脂A，40％-60％聚烯烃树脂B；
基材膜内层3：20％-30％聚烯烃树脂A，70％-80％聚烯烃树脂B；
其中，聚烯烃树脂A为丙烯与乙烯单体的共聚物，该共聚物中乙烯单体的摩尔含量为2％-20％，密度为0.86g/cm 3-0.91g/cm 3，熔点为135℃-168℃；聚烯烃树脂B为C6或C8的茂金属聚乙烯，密度为0.90g/cm 3-0.94g/cm 3，熔点为96℃-128℃。
本实施例中，所述聚烯烃金属化复合膜的总厚度为90-170μm。
本实施例中，所述金属涂层4的厚度为50-60nm，金属材质为铝；将聚烯烃金属化膜基材膜的基材膜内层3经电晕后采用真空蒸镀法使金属的蒸汽沉淀堆积到膜的表面，可以形成一层金属涂层。
本实施例中，所述胶黏剂为聚氨酯胶，复合时采用干式复合的工艺。
实施例1
1).在外层料斗中加入100kg的树脂B和25kg的树脂A，在中层料斗中加入50kg的树脂B和75kg的树脂A，在内层料斗中加入100kg的树脂B和25kg的树脂A；混合均匀后，经三台螺杆挤出机(螺杆直径
Figure PCTCN2019087726-appb-000001
长径比为30，工作温度为180-190℃)挤出，由外、中、内三层共挤经模头上吹成筒膜。其中，外、中、内三层所占膜的厚度比例为1∶1∶1；其中树脂A牌号为RB707CF，树脂B牌号为1018CA。
2).聚烯烃基材膜层制作完成后，将基材膜内层3进行电晕处理，电晕电流为4安培，用达因值为42的达因水涂刷时，2秒不收缩；再送入真空镀铝机中加工铝涂层，卷取速度为300m/min；送铝速度为0.8m/min；真空度为4帕，抽真空时间小于20min；将基材膜内层3 表面涂覆一层金属涂层4，金属涂层4的厚度为55nm，制备形成聚烯烃金属化膜层。
3).最后将聚烯烃金属化膜的金属面和聚乙烯薄膜5在干式复合机上用聚氨酯胶黏剂进行复合，制作成聚烯烃金属化复合膜，经过熟化静置后便可用作重包袋材料。其中，复合速度为120m/min；烘道温度：第一段40℃，第二段50℃，第三段55℃；热鼓压辊温度为60℃；热鼓压辊压力为0.5MPa；压胶辊压力为0.4MPa。
实施例2
1).在外层料斗中加入70kg的树脂B和30kg的树脂A，在中层料斗中加入60kg的树脂B和40kg的树脂A，在内层料斗中加入75kg的树脂B和25kg的树脂A；混合均匀后，经三台螺杆挤出机(螺杆直径
Figure PCTCN2019087726-appb-000002
长径比为30，工作温度为180-190℃)挤出，由外、中、内三层共挤经模头上吹成筒膜。其中，外、中、内三层所占膜的厚度比例为1∶1∶1；其中树脂A牌号为RB707CF，树脂B牌号为1018CA。
2).聚烯烃基材膜层制作完成后，将基材膜内层3进行电晕处理，电晕电流为4安培，用达因值为42的达因水涂刷时，2秒不收缩；再送入真空镀铝机中加工铝涂层，卷取速度为350m/min；送铝速度为1m/min；真空度为5帕，抽真空时间小于20min；将基材膜内层3表面涂覆一层金属涂层4，金属涂层4的厚度为60nm，制备形成聚烯烃金属化膜层。
3).最后将聚烯烃金属化膜的金属面和聚乙烯薄膜5在干式复合机上用聚氨酯胶黏剂进行复合，制作成聚烯烃金属化复合膜，经过熟化静置后便可用作重包袋材料。其中，复合速度为120m/min；烘道温度：第一段50℃，第二段55℃，第三段60℃；热鼓压辊温度为60℃；热鼓压辊压力为0.6MPa；压胶辊压力为0.6MPa。
以上所述的仅是本发明的优选实施方式，应当指出，对于本领域的普通技术人员来说，在不脱离本发明创造构思的前提下，还可以做出若干变形和改进，这些都属于本发明的保护范围。

Claims (9)

  1. 一种可回收聚烯烃金属化复合膜，其特征在于：包括聚烯烃金属化膜层以及聚乙烯膜层(5)；所述聚烯烃金属化膜层由聚烯烃基材膜层和金属涂层(4)组成，所述聚烯烃基材膜层为三层复合膜结构，由上至下依次为基材膜外层(1)、基材膜中层(2)以及基材膜内层(3)，各层膜的厚度相等；所述金属涂层(4)涂覆于所述基材膜内层(3)的下表面，所述金属涂层(4)的下表面通过胶黏剂与聚乙烯膜层(5)进行复合。
  2. 根据权利要求1所述的一种可回收聚烯烃金属化复合膜，其特征在于：所述聚烯烃基材膜层是由三台螺杆挤出机将外层、中层以及内层料共挤经模头上吹吹塑成型，所述三层的原料组成如下：
    基材膜外层(1)：20％-30％聚烯烃树脂A，70％-80％聚烯烃树脂B；
    基材膜中层(2)：40％-60％聚烯烃树脂A，40％-60％聚烯烃树脂B；
    基材膜内层(3)：20％-30％聚烯烃树脂A，70％-80％聚烯烃树脂B；
    其中，聚烯烃树脂A为丙烯与乙烯单体的共聚物，该共聚物中乙烯单体的摩尔含量为2％-20％，密度为0.86g/cm 3-0.91g/cm 3，熔点为135℃-168℃；聚烯烃树脂B为C6或C8的茂金属聚乙烯，密度为0.90g/cm 3-0.94g/cm 3，熔点为96℃-128℃。
  3. 根据权利要求2所述的一种可回收聚烯烃金属化复合膜，其特征在于：所述聚烯烃金属化复合膜的总厚度为90-170μm。
  4. 根据权利要求1所述的一种可回收聚烯烃金属化复合膜，其特征在于：所述金属涂层(4)的厚度为50-60nm，金属材质为铝。
  5. 根据权利要求1所述的一种可回收聚烯烃金属化复合膜，其特征在于：所述胶黏剂为聚氨酯胶。
  6. 权利要求2所述的可回收聚烯烃金属化复合膜的制备方法，其特征在于，制备方法如下：
    1).分别在外层料斗、中层料斗以及内层料斗中加入各层需要的原料，混合均匀后，经三层共挤吹膜机用上吹法吹塑形成聚烯烃基材膜；吹膜机在收卷时，开启电晕机，对基材膜内层(3)的一面进行电晕处理；
    2).取步骤1)制备的聚烯烃基材膜送入真空镀铝机中，在基材膜内层(3)电晕表面涂覆一层金属铝涂层(4)，制备形成聚烯烃金属化膜层；
    3).将步骤2)制备的聚烯烃金属化膜和聚乙烯薄膜在干式复合机上用聚氨酯胶黏剂进行复合，制作成聚烯烃金属化复合膜，经过熟化静置后用作重包袋材料。
  7. 根据权利要求6所述的可回收聚烯烃金属化复合膜的制备方法，其特征在于：所述步骤1)中，基材膜内层(3)进行电晕处理的工艺条件为：电晕电流为4安培，用达因值为42的 达因水涂刷时，2秒不收缩。
  8. 根据权利要求6所述的可回收聚烯烃金属化复合膜的制备方法，其特征在于：所述步骤2)中，真空镀铝加工工艺条件为：卷取速度为250-350m/min；送铝速度为0.5-1m/min；真空度为3-5帕，抽真空时间小于20min。
  9. 根据权利要求6所述的可回收聚烯烃金属化复合膜的制备方法，其特征在于：所述步骤3)中，干式复合机的工艺条件为：复合速度120m/min；烘道温度：第一段40℃-50℃，第二段50℃-55℃，第三段55-60℃；热鼓压辊温度为60℃；热鼓压辊压力为0.5MPa-0.6MPa；压胶辊压力为0.4MPa-0.6MPa。
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