Aluminized fastness matt film and preparation method thereof

Abstract

The invention discloses an aluminized fastness matt film and a preparation method thereof, and belongs to the technical field of functional films. The aluminum-plated firm matt film sequentially comprises an aluminum-plated layer, a core layer and a matt layer from top to bottom, the matting layer comprises a matting master batch, and the matting master batch comprises the following raw materials in percentage by mass: 20-30% of a matting agent, 2-4% of a compatibilizer, 0.05-0.1% of an antioxidant and 65.9-77.05% of polypropylene; the aluminum-plated layer comprises the following raw materials in percentage by mass: 96-99% of heat-sealing master batch and 1-4% of anti-adhesion master batch; the heat-sealing master batch comprises the following raw materials in percentage by mass: 97-99% of polypropylene and 1-3% of polyethylene; the anti-blocking master batch comprises the following raw materials in percentage by mass: 96-99% of polypropylene and 1-4% of synthetic silicon dioxide; the matt film prepared by the invention is a high-fastness aluminum laminated film with large thickness, high aluminum plating fastness, few dark spots on the surface of the aluminum laminated film and stable size, is widely applied to the market, and can be used for labeling and plastic molding in a high-end film.

Description

Technical Field

[0001] The invention relates to the technical field of functional films, and in particular to an aluminum-plated fastness matte film and a preparation method thereof. Background Art

[0002] Thick high-fastness matte aluminized film is a high-value-added functional film that can be used for aluminized printing, in-film labeling and injection molding. The product has the characteristics of high haze, low gloss, high aluminized strength, and few dark spots on the aluminized film surface. Ordinary matte aluminized film has poor adhesion of the aluminum layer after vacuum aluminization, easy to fall off, and many dark spots on the film surface after aluminization, which are currently difficult to solve. The traditional process method is to pre-coat a certain amount of polyurethane and other materials on the film, fully dry it, and then vacuum aluminize it to improve the bonding strength between the aluminum layer and the film. However, the aluminized film formed by the coating process has high production cost and low efficiency, poor operability, and the presence of volatile substances that are easy to damage human and environmental health.

[0003] Traditional matte aluminum-coated films have low adhesion of the aluminum layer, which is easy to fall off, and require secondary coating to obtain a high-fastness aluminum-coated film. The film production efficiency is low and the cost is high. In addition, the aluminum-coated film is easily exposed to strong light to produce dark spots, which can easily affect the aluminum plating effect and thus affect the product appearance and other performance. Therefore, the market needs an aluminum-coated film that can be formed in one step without the need for secondary coating, and the aluminum-coated surface is clean and flat without dark spots and other problems.

[0004] The existing BOPP matte aluminized film production process has problems such as low production efficiency, high cost, low aluminized fastness, poor water and oxygen barrier properties, and many dark spots on the film surface after aluminized. Summary of the invention

[0005] Based on the technical problems existing in the background technology, the present invention proposes an aluminum-plated fastness matte film and a preparation method thereof, which solves the current problems of low production efficiency, poor aluminum-plated fastness, and many dark spots on the film surface after aluminum plating.

[0006] An aluminum-plated fastness matte film, comprising, from top to bottom:

[0007] Aluminum coating, core layer and matte layer;

[0008] The matt layer includes a matt masterbatch, which includes the following raw materials in mass percentage: 20-30% of a matting agent, 2-4% of a compatibilizer, 0.05-0.1% of an antioxidant, and 65.9-77.05% of polypropylene; the aluminum-plated layer includes the following raw materials in mass percentage: 96-99% of a heat-sealing masterbatch and 1-4% of an anti-adhesion masterbatch; the heat-sealing masterbatch includes the following raw materials in mass percentage: 97-99% of polypropylene and 1-3% of polyethylene; the anti-adhesion masterbatch includes the following raw materials in mass percentage: 96-99% of polypropylene and 1-4% of synthetic silica.

[0009] Preferably, the core layer comprises the following raw materials: polypropylene.

[0010] Preferably, the melt index of the matte masterbatch is 2.0 to 5.0 g / 10 min.

[0011] Preferably, the melt index of the anti-adhesion masterbatch is 6.0 to 20.0 g / 10 min.

[0012] Preferably, the melt index of the heat-sealing masterbatch is 6.0 to 20.0 g / 10 min.

[0013] Preferably, the matte layer has a thickness of 2.4 to 2.8 μm, the core layer has a thickness of 40.6 to 41.4 μm, and the aluminum-plated layer has a thickness of 1.2 to 1.5 μm.

[0014] A method for preparing an aluminum-plated fastness matte film comprises the following steps:

[0015] The matte layer, aluminum-plated layer and core layer are melted, co-extruded, and cooled by cold rollers to form a cast sheet. The cast sheet is preheated by longitudinal stretching, stretched and shaped, cooled, and then preheated by transverse stretching, stretched and shaped, cooled, and then pulled and rolled, and then slit to obtain a finished film roll.

[0016] Preferably, the melting temperature of the matte layer is 220-235°C, the melting temperature of the core layer is 250-260°C, and the melting temperature of the aluminum-plated layer is 235-245°C.

[0017] Preferably, the stretching ratio of the longitudinal stretching is 4.8-5.2, the preheating temperature of the longitudinal stretching is 110-125°C; and the preheating temperature of the transverse stretching is 155-170°C.

[0018] The above-mentioned aluminum-plated fastness matte film or the aluminum-plated fastness matte film prepared by the above-mentioned preparation method is used in aluminum-plated printing and in-film label injection molding production.

[0019] The beneficial effects of the present invention are as follows:

[0020] The thick matte aluminum-plated film of the present invention has high aluminum layer adhesion, high aluminum plating fastness, the aluminum layer is not easy to fall off, and the aluminum-plated film with high fastness adhesion can be obtained without secondary coating. The product has high haze, high gloss, high heat sealing strength of the aluminum-plated surface, high aluminum layer adhesion, no dark spots and other problems are generated after aluminum plating, and has high market economic value. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention are described clearly and completely. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] Comparative Example 1

[0023] Ordinary thick high aluminum fastness matte film, characterized in that it is composed of a lower surface layer, a core layer, and an upper surface layer in sequence, wherein the first layer is a matte layer, the middle layer is a core layer, and the other layer is an aluminum layer;

[0024] The matte layer includes the following raw materials: matte masterbatch;

[0025] The core layer includes the following materials: homopolymer polypropylene;

[0026] The anti-aluminum plating layer includes the following raw materials: heat-seal copolymer polypropylene, anti-adhesion masterbatch;

[0027] The matt layer comprises the following raw materials: a matt masterbatch; the melting index of the matt masterbatch under a 230° C. / 2.16KG standard test is 2.2 g / 10 min.

[0028] The high-fastness matt aluminum-plated film matt layer is characterized in that the ultra-low content migratory oligomer matt masterbatch comprises the following raw materials in percentage by mass: 70% copolymerized polypropylene and 30% matting agent.

[0029] The ultra-low content migratory oligomer matting masterbatch comprises the following raw materials in percentage by weight: 30% matting agent, 4% compatibilizer, 0.1% antioxidant, and the balance is binary copolymer polypropylene;

[0030] The anti-adhesive masterbatch comprises the following raw materials in percentage by weight: 97% copolymerized polypropylene and 3% synthetic silicon dioxide; the melt index of the anti-adhesive masterbatch under a standard test of 230° C. / 2.16KG is 6.5 g / 10 min.

[0031] The aluminum-plated layer includes the following raw materials in percentage by mass: 97% of heat-sealing masterbatch and 3% of anti-adhesion masterbatch.

[0032] The aluminum-plated layer heat-sealing masterbatch includes the following raw materials in percentage by mass: 98% polypropylene and 2% polyethylene; the melt index of the heat-sealing masterbatch under the 230° C. / 2.16KG standard test is 7.12 g / 10 min.

[0033] The matte layer comprises the following raw materials in mass percentage: 100% matte masterbatch, the core layer comprises the following raw materials in mass percentage: 100% homopolypropylene; the aluminum-plated layer comprises the following raw materials in mass percentage: 3% anti-adhesion masterbatch and 97% homopolypropylene.

[0034] The thickness of the matte layer is 2.4μm, the thickness of the core layer is 41.4μm, and the thickness of the aluminum coating layer is 1.2μm;

[0035] The preparation method of a thick high-fastness matte aluminum-plated film comprises the following steps: respectively adding the raw materials of the matte layer and the aluminum-plated layer into two auxiliary extruders, adding the raw materials of the core layer into the main extruder, heating and melting, and then co-extruding through a die head, cooling through a quenching roller to form a cast sheet, preheating the cast sheet through longitudinal drawing, stretching and shaping cooling, and then continuing to preheat, stretch and shape cooling through transverse drawing, and then traction and winding and aging and slitting to obtain a finished film roll.

[0036] Thick high-fastness matte aluminized film, the heating and melting temperature of the matte layer is 220℃, the heating and melting temperature of the core layer is 250℃, and the heating and melting temperature of the aluminized layer is 235℃;

[0037] The longitudinal stretching has a stretching ratio of 4.6 and a temperature of 110°C;

[0038] The temperature of the transverse stretching was 155°C.

[0039] Example A

[0040] Ordinary thick high aluminum fastness matte film, characterized in that it is composed of a lower surface layer, a core layer, and an upper surface layer in sequence, wherein the first layer is a matte layer, the middle layer is a core layer, and the other layer is an aluminum layer;

[0041] The matte layer includes the following raw materials: ultra-low content migratory oligomer matte masterbatch;

[0042] The core layer includes the following raw materials: homopolymer polypropylene;

[0043] The anti-aluminum plating layer includes the following raw materials: heat-sealing copolymer polypropylene, anti-adhesion masterbatch;

[0044] The matt layer comprises the following raw materials: an ultra-low content migratory oligomer matt masterbatch; the melt index of the matt masterbatch under a 230° C. / 2.16KG standard test is 2.0 g / 10 min.

[0045] The high-fastness matt aluminum-plated film matt layer is characterized in that the ultra-low content migratory oligomer matt masterbatch comprises the following raw materials in percentage by mass: 30% matt agent, 2% compatibilizer, 0.05% antioxidant, and the balance is binary copolymer polypropylene;

[0046] The anti-adhesion masterbatch comprises the following raw materials in percentage by weight: 96% homopolypropylene and 4% synthetic silicon dioxide; the anti-adhesion masterbatch has a melting index of 6.5 g / 10 min under a standard test at 230° C. / 2.16 KG.

[0047] The aluminum-plated layer includes the following raw materials in percentage by mass: 96% of heat-sealing masterbatch and 4% of anti-adhesion masterbatch.

[0048] The aluminum-plated layer heat-sealing masterbatch includes the following raw materials in percentage by mass: 97% polypropylene and 3% polyethylene; the melt index of the heat-sealing masterbatch under the 230° C. / 2.16KG standard test is 7.12 g / 10 min.

[0049] The matte layer comprises the following raw materials in mass percentage: 100% matte masterbatch, the core layer comprises the following raw materials in mass percentage: 100% homopolypropylene; the aluminum-plated layer comprises the following raw materials in mass percentage: 3% anti-adhesion masterbatch and 97% heat-sealing masterbatch.

[0050] The thickness of the matte layer is 2.4μm, the thickness of the core layer is 41.4μm, and the thickness of the aluminum coating layer is 1.2μm;

[0051] The preparation method of a thick high-fastness matte aluminum-plated film comprises the following steps: respectively adding the raw materials of the matte layer and the aluminum-plated layer into two auxiliary extruders, adding the raw materials of the core layer into the main extruder, heating and melting, and then co-extruding through a die head, cooling through a quenching roller to form a cast sheet, preheating the cast sheet through longitudinal drawing, stretching and shaping cooling, and then continuing to preheat, stretch and shape cooling through transverse drawing, and then traction and winding and aging and slitting to obtain a finished film roll.

[0052] Thick high-fastness matte aluminized film, the heating and melting temperature of the matte layer is 220℃, the heating and melting temperature of the core layer is 250℃, and the heating and melting temperature of the aluminized layer is 235℃;

[0053] The longitudinal stretching has a stretching ratio of 4.6 and a temperature of 110°C;

[0054] The temperature of the transverse stretching was 155°C.

[0055] Example B

[0056] Ordinary thick high aluminum fastness matte film, characterized in that it is composed of a lower surface layer, a core layer, and an upper surface layer in sequence, wherein the first layer is a matte layer, the middle layer is a core layer, and the other layer is an aluminum layer;

[0057] The matte layer includes the following raw materials: ultra-low content migratory oligomer matte masterbatch;

[0058] The core layer includes the following raw materials: homopolymer polypropylene;

[0059] The anti-aluminum plating layer includes the following raw materials: high heat seal strength copolymer polypropylene, high dispersion anti-adhesion masterbatch;

[0060] The matt layer comprises the following raw materials: an ultra-low content migratory oligomer matt masterbatch; the melt index of the matt masterbatch under a 230° C. / 2.16KG standard test is 2.0 g / 10 min.

[0061] The high-fastness matt aluminum-plated film matt layer is characterized in that the ultra-low content migratory oligomer matt masterbatch comprises the following raw materials in percentage by mass: 70% copolymerized polypropylene and 30% matting agent.

[0062] The ultra-low content migratory oligomer matting masterbatch comprises the following raw materials in percentage by weight: 20% matting agent, 4% compatibilizer, 0.1% antioxidant, and the balance is binary copolymer polypropylene;

[0063] The anti-adhesion masterbatch comprises the following raw materials in percentage by mass: 99% homopolypropylene and 1% imported synthetic silica; the melt index of the anti-adhesion masterbatch under the 230°C / 2.16KG standard test is 14.5g / 10min.

[0064] The aluminum plating layer includes the following raw materials in percentage by mass: 99% of heat sealing masterbatch and 1% of anti-adhesion masterbatch.

[0065] The aluminum-plated layer high heat-seal strength masterbatch comprises the following raw materials in percentage by mass: 99% polypropylene and 1% polyethylene; the melt index of the heat-seal masterbatch under a standard test of 230° C. / 2.16KG is 9.2g / 10min.

[0066] The matte layer comprises the following raw materials in mass percentage: 100% ultra-low content migratory oligomer matte masterbatch, the core layer comprises the following raw materials in mass percentage: 100% homopolypropylene; the aluminum plating layer comprises the following raw materials in mass percentage: 4% anti-adhesion masterbatch and 96% homopolypropylene.

[0067] The thickness of the matte layer is 2.4μm, the thickness of the core layer is 41.4μm, and the thickness of the aluminum coating layer is 1.2μm;

[0068] The preparation method of a thick high-fastness matte aluminum-plated film comprises the following steps: respectively adding the raw materials of the matte layer and the aluminum-plated layer into two auxiliary extruders, adding the raw materials of the core layer into the main extruder, heating and melting, and then co-extruding through a die head, cooling through a quenching roller to form a cast sheet, preheating the cast sheet through longitudinal drawing, stretching and shaping cooling, and then continuing to preheat, stretch and shape cooling through transverse drawing, and then traction and winding and aging and slitting to obtain a finished film roll.

[0069] Thick high-fastness matte aluminized film, the heating and melting temperature of the matte layer is 220-235°C, the heating and melting temperature of the core layer is 250-260°C, and the heating and melting temperature of the aluminized layer is 235-245°C;

[0070] The longitudinal stretching has a stretch ratio of 5.2 and a temperature of 125°C;

[0071] The temperature of the transverse stretching is 170°C.

[0072] Example C

[0073] Ordinary thick high aluminum fastness matte film, characterized in that it is composed of a lower surface layer, a core layer, and an upper surface layer in sequence, wherein the first layer is a matte layer, the middle layer is a core layer, and the other layer is an aluminum layer;

[0074] During the implementation, the matte layer and the aluminized layer are interchanged, and during the production process, the matte layer and the aluminized layer of the film are switched up and down, that is, the cold roller surface and the patch air knife surface at the die head of the multi-layer co-extrusion extruder are switched for production. Others are as follows;

[0075] The matte layer includes the following raw materials: ultra-low content migratory oligomer matte masterbatch;

[0076] The core layer includes the following raw materials: homopolymer polypropylene;

[0077] The anti-aluminum plating layer includes the following raw materials: high heat seal strength copolymer polypropylene, high dispersion anti-adhesion masterbatch;

[0078] The matt layer comprises the following raw materials: an ultra-low content migratory oligomer matt masterbatch; the melt index of the matt masterbatch under a 230° C. / 2.16KG standard test is 2.0 g / 10 min.

[0079] The high-fastness matt aluminum-plated film matt layer is characterized in that the ultra-low content migratory oligomer matt masterbatch comprises the following raw materials in percentage by mass: 70% copolymerized polypropylene and 30% matting agent.

[0080] The ultra-low content migratory oligomer matting masterbatch comprises the following raw materials in percentage by weight: 30% matting agent, 2% compatibilizer, 0.05% antioxidant, and the balance is binary copolymer polypropylene;

[0081] The anti-adhesion masterbatch comprises the following raw materials in percentage by mass: 96% homopolymer polypropylene and 4% imported synthetic silica; the melt index of the anti-adhesion masterbatch under the 230° C. / 2.16KG standard test is 14.5 g / 10 min.

[0082] The aluminum-plated layer includes the following raw materials in percentage by mass: 97% of heat-sealing masterbatch and 3% of anti-adhesion masterbatch.

[0083] The aluminum-plated layer high heat-seal strength masterbatch comprises the following raw materials in percentage by mass: 96% polypropylene and 4% polyethylene; the melt index of the heat-seal masterbatch under a standard test of 230° C. / 2.16KG is 9.2g / 10min.

[0084] The matte layer comprises the following raw materials in mass percentage: 100% ultra-low content migratory oligomer matte masterbatch, the core layer comprises the following raw materials in mass percentage: 100% homopolypropylene; the aluminum plating layer comprises the following raw materials in mass percentage: 4% anti-adhesion masterbatch and 96% homopolypropylene.

[0085] The thickness of the matte layer is 2.6μm, the thickness of the core layer is 41.0μm, and the thickness of the aluminum coating layer is 1.4μm;

[0086] The preparation method of a thick high-fastness matte aluminum-plated film comprises the following steps: respectively adding the raw materials of the matte layer and the aluminum-plated layer into two auxiliary extruders, adding the raw materials of the core layer into the main extruder, heating and melting, and then composite co-extruding through a die head, cooling through a quenching roller to form a cast sheet, preheating the cast sheet through longitudinal drawing, stretching and shaping cooling, and then continuing to preheat, stretch and shape cooling through transverse drawing, and then traction and winding and aging and slitting to obtain a finished film roll.

[0087] Thick high-fastness matte aluminized film, the heating and melting temperature of the matte layer is 235℃, the heating and melting temperature of the core layer is 260℃, and the heating and melting temperature of the aluminized layer is 245℃;

[0088] The longitudinal stretching has a stretch ratio of 5.2 and a temperature of 125°C;

[0089] The temperature of the transverse stretching is 170°C.

[0090] Table 1 Main physical properties of the film

[0091]

[0092] It can be seen from the table that ordinary matte aluminum-plated film has low haze, low gloss, low heat sealing strength, high aluminum layer shedding area, and the number of dark spots per square reaches 28. After replacing the matte masterbatch with low migration oligomer content in Example A, the haze becomes larger and the aluminum layer shedding area decreases. In Example B, the heat sealing strength of the film becomes higher, the aluminum layer shedding area decreases, and the number of dark spots is still large. In Example C, the heat sealing strength of the film becomes higher, the aluminum layer shedding area decreases, and the number of dark spots is reduced to 0, which meets the existing market and technical requirements and has a high market economic value.

[0093] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0094] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. An aluminum-plated fastness matte film, characterized in that: From top to bottom, they include: Aluminum coating, core layer and matte layer; The matt layer includes a matt masterbatch, which includes the following raw materials in mass percentage: 20-30% of a matting agent, 2-4% of a compatibilizer, 0.05-0.1% of an antioxidant, and 65.9-77.05% of polypropylene; the aluminum-plated layer includes the following raw materials in mass percentage: 96-99% of a heat-sealing masterbatch and 1-4% of an anti-adhesion masterbatch; the heat-sealing masterbatch includes the following raw materials in mass percentage: 97-99% of polypropylene and 1-3% of polyethylene; the anti-adhesion masterbatch includes the following raw materials in mass percentage: 96-99% of polypropylene and 1-4% of synthetic silica.

2. The aluminum fastness matte film according to claim 1, characterized in that: The core layer comprises the following raw materials: polypropylene.

3. The aluminum-plated fastness matte film according to claim 1, characterized in that: The melt index of the matte masterbatch is 2.0 to 5.0 g / 10 min.

4. The aluminum fastness matte film according to claim 1, characterized in that: The melt index of the anti-adhesive masterbatch is 6.0 to 20.0 g / 10 min.

5. The aluminum-plated fastness matte film according to claim 1, characterized in that: The melt index of the heat-sealing masterbatch is 6.0 to 20.0 g / 10 min.

6. The aluminum-plated fastness matte film according to claim 1, characterized in that: The thickness of the matt layer is 2.2-3.0 μm, the thickness of the core layer is 40.4-42.8 μm, and the thickness of the aluminum plating layer is 1.0-1.6 μm.

7. A method for preparing an aluminum-plated fastness matte film, characterized in that: The steps include: The matte layer, aluminum-plated layer and core layer are melted, co-extruded, and cooled by cold rollers to form a cast sheet. The cast sheet is preheated by longitudinal stretching, stretched and shaped, cooled, and then preheated by transverse stretching, stretched and shaped, cooled, and then traction and winding are carried out, and then slitting is performed to obtain a finished film roll.

8. The method for preparing the aluminum-plated fastness matte film according to claim 7, characterized in that: The melting temperature of the matt layer is 220-235°C, the melting temperature of the core layer is 250-260°C, and the melting temperature of the aluminum-plated layer is 235-245°C.

9. The method for preparing the aluminum-plated fastness matte film according to claim 7, characterized in that: The stretching ratio of the longitudinal stretching is 4.8-5.2, the preheating temperature of the longitudinal stretching is 110-125°C; the preheating temperature of the transverse stretching is 155-170°C.

10. Use of the aluminized fastness matte film according to any one of claims 1 to 6 or the aluminized fastness matte film prepared by the preparation method according to any one of claims 7 to 9 in aluminized printing and in-film label injection molding production.

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