PP decorative film with metal texture and preparation method thereof

Abstract

The invention provides a PP decorative film with metal texture and a preparation method thereof. The PP decorative film comprises polypropylene, aluminum powder and a compound additive, wherein the compound additive comprises a dispersing agent, a compatilizer, a coupling agent, an antioxidant and a toughening agent; wherein relative to 100 parts by weight of polypropylene, the use amount of the aluminum powder is 1.5 to 5 parts by weight, the use amount of the dispersing agent is 0.5 to 2 parts by weight, the use amount of the compatilizer is 0.5 to 2 parts by weight, the use amount of the coupling agent is 2 to 6 parts by weight, the use amount of the antioxidant is 0.1 to 0.5 part by weight, and the use amount of the toughening agent is 5 to 10 parts by weight. The PP decorative film provided by the invention is a metal-texture PP decorative film prepared by adopting a melt extrusion casting integrated molding process, the surface is smooth and clean, layering of an aluminum layer can be effectively avoided, the impact resistance is high, and cracks cannot occur through 180-degree bending.

Description

Technical Field

[0001] The invention relates to the technical field of PP decorative films, in particular to a PP decorative film with a metallic texture and a preparation method thereof. Background Art

[0002] As modern architecture and interior design have increasingly higher requirements for material aesthetics and functionality, decorative films, as a new type of surface decoration material, are increasingly in demand. Especially in the field of high-end decoration, metallic decorative films are favored for their unique visual effects and practical performance. Metallic decorative films not only provide a metallic luster and texture, but also have the lightness and plasticity of plastic materials, which makes them widely used in many fields such as indoor and outdoor decoration, furniture manufacturing, and electronic product packaging.

[0003] At present, the commonly used metal-sense modification materials on the market mainly use aluminum-plated films, which are made by vacuum aluminum plating on the corona layer of plastic films. However, the aluminum-plated films prepared in this way often have insufficient adhesion between the aluminum layer and the plastic substrate, resulting in delamination during use, which in turn affects the durability and aesthetics of the product. In addition, the aluminum-plated layer formed by aluminum plating on the surface of the plastic layer has poor bending performance and insufficient toughness of the material, which limits its application in products with complex shapes. At the same time, the existing vacuum aluminum plating process has low production efficiency and increases manufacturing costs. Summary of the invention

[0004] 1. Technical issues to be resolved

[0005] In view of the deficiencies in the prior art, the present invention provides a PP decorative film with a metallic texture and a preparation method thereof. By optimizing the raw materials, the PP decorative film with a metallic texture can be prepared only by melt extrusion and cast integrated film forming, thereby solving the problems raised in the above-mentioned background technology.

[0006] (II) Technical solution

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0008] According to a first aspect of the present invention, there is provided a PP decorative film with a metallic texture, comprising polypropylene, aluminum powder and a composite auxiliary agent, wherein the composite auxiliary agent comprises a dispersant, a compatibilizer, a coupling agent, an antioxidant and a toughening agent;

[0009] Wherein, relative to 100 parts by weight of the polypropylene, the amount of the aluminum powder is 1.5 to 5 parts by weight, the amount of the dispersant is 0.5 to 2 parts by weight, the amount of the compatibilizer is 0.5 to 2 parts by weight, the amount of the coupling agent is 2 to 6 parts by weight, the amount of the antioxidant is 0.1 to 0.5 parts by weight, and the amount of the toughening agent is 5 to 10 parts by weight.

[0010] This application mainly adjusts the preparation method to solve the problems of easy delamination, poor toughness and low production efficiency of the aluminum-plated film prepared by the traditional vacuum aluminum plating method. It is mainly prepared by the method of melt extrusion casting integrated molding to improve production efficiency. However, when aluminum powder is directly doped in polypropylene, due to the high specific surface area and specific surface energy of aluminum powder, agglomeration is very likely to occur. After agglomeration, the surface finish after film formation is poor, and the product quality is not high. This application adds dispersants and compatibilizers to synergistically improve the dispersion and compatibility of aluminum powder in polypropylene, reduce the agglomeration of aluminum powder, and improve the surface finish after film formation. It not only effectively improves the delamination phenomenon but also significantly improves the mechanical strength of the PP decorative film; in addition, a toughening agent is added to promote the combination of the toughening agent, aluminum powder and polypropylene through a coupling agent, improve the interface stability, and thus make the prepared PP decorative film have excellent toughness and impact resistance, and have excellent performance in application scenarios such as bending.

[0011] Preferably, the polypropylene is selected from isotactic polypropylene with a molecular weight of 80,000 to 150,000.

[0012] The present invention can increase the entanglement of the two parts of polypropylene by selecting isotactic polypropylene with a molecular weight of 80,000 to 150,000, thereby improving the tensile strength and rigidity of the PP decorative film. In addition, the high molecular weight isotactic polypropylene has a higher crystallinity and an orderly arrangement of molecular chains, and has excellent optical clarity and gloss.

[0013] Preferably, the average particle size of the aluminum powder is 14.81 to 15 μm, and the specific surface area of ​​the aluminum powder is 1.33 to 66.7 m 2 / g.

[0014] By setting the average particle size and specific surface area of ​​aluminum powder, more contacts can be provided to interact with polypropylene, further reducing agglomeration, improving the surface smoothness and uniformity after film formation, and at the same time enhancing the metallic texture of the PP decorative film.

[0015] Preferably, the dispersant is selected from at least one of paraffin wax, polypropylene wax, pentaerythritol stearate and pentaerythritol calcium stearate.

[0016] Preferably, the compatibilizer is selected from styrene-butadiene-styrene block copolymer and / or maleic anhydride grafted polypropylene.

[0017] Preferably, the coupling agent is selected from at least one of an aluminate coupling agent, a borate coupling agent, a silane coupling agent or a titanate coupling agent.

[0018] Preferably, the antioxidant is selected from at least one of tris(2,4-di-tert-butylphenyl)phosphite, pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate and bis(2,4-di-tert-butylphenyl)pentaerythritol diphosphite.

[0019] Preferably, the toughening agent is selected from elastomer POE and / or elastomer EPDM.

[0020] According to a second aspect of the present invention, there is provided a method for preparing a PP decorative film having a metallic texture, comprising the following steps:

[0021] S1. Add polypropylene, aluminum powder, dispersant, compatibilizer, coupling agent, antioxidant and toughening agent into a high-speed mixer and mix to obtain a preliminary mixed material;

[0022] S2. The preliminary mixed material is melt-extruded through a twin-screw extruder and cast into a film to obtain the PP decorative film with a metallic texture.

[0023] Preferably, the temperature of the melt extrusion is 200-250°C, and the temperature of the cast film is 20-45°C.

[0024] (III) Beneficial effects

[0025] The present invention provides a PP decorative film with metallic texture and a preparation method thereof, which has the following beneficial effects:

[0026] (1) The present invention provides a PP decorative film with a metallic texture. Compared with the PP decorative film traditionally prepared by vacuum aluminum plating, the PP decorative film can effectively avoid the delamination of the aluminum layer and also increase the toughness of the PP decorative film, thereby achieving excellent performance in application scenarios such as bending.

[0027] (2) The present invention provides a PP decorative film with a metallic texture. The film is formed by a melt extrusion casting process without the aggregation of aluminum powder. The surface of the PP decorative film is smooth and the impact resistance is greatly improved.

[0028] (3) The present invention provides a method for preparing a PP decorative film with a metallic texture. The preparation process is simple and the PP decorative film can be mass-produced to increase the yield, which is suitable for industrial production. DETAILED DESCRIPTION

[0029] The present invention is further described below in conjunction with specific implementation methods. It should be noted that, under the premise of no conflict, the embodiments or technical features described below can be arbitrarily combined to form new embodiments. The following are specific embodiments of the present invention. Unless otherwise specified, the raw materials, equipment, etc. used in the following embodiments can all be obtained by purchase.

[0030] Example 1

[0031] A method for preparing a PP decorative film with a metallic texture comprises the following steps:

[0032] (1) Prepare 100 parts by weight of isotactic polypropylene with a molecular weight of 100,000 and 3 parts by weight of polypropylene with an average particle size of 10 μm and a specific surface area of ​​22.2 m 2 / g of aluminum powder, 1 part by weight of paraffin wax, 1 part by weight of styrene-butadiene-styrene block copolymer, 4 parts by weight of silane coupling agent, 0.3 parts by weight of tris(2,4-di-tert-butylphenyl) phosphite and 7 parts by weight of elastomer POE are added into a high-speed mixer and fully mixed to obtain a preliminary mixed material;

[0033] (2) The obtained preliminary mixed material is melt-extruded at 220° C. through a twin-screw extruder, and then cast into a film at 30° C. to obtain a PP decorative film with a metallic texture.

[0034] Example 2

[0035] A method for preparing a PP decorative film with a metallic texture comprises the following steps:

[0036] (1) Prepare 100 parts by weight of isotactic polypropylene with a molecular weight of 100,000 and 1.5 parts by weight of a polypropylene with an average particle size of 5 μm and a specific surface area of ​​44.44 m 2 / g of aluminum powder, 1 part by weight of paraffin wax, 1 part by weight of styrene-butadiene-styrene block copolymer, 4 parts by weight of silane coupling agent, 0.3 parts by weight of tris(2,4-di-tert-butylphenyl) phosphite and 7 parts by weight of elastomer POE are added into a high-speed mixer and fully mixed to obtain a preliminary mixed material;

[0037] (2) The obtained preliminary mixed material is melt-extruded at 220° C. through a twin-screw extruder, and then cast into a film at 30° C. to obtain a PP decorative film with a metallic texture.

[0038] Example 3

[0039] A method for preparing a PP decorative film with a metallic texture comprises the following steps:

[0040] (1) Prepare 100 parts by weight of isotactic polypropylene with a molecular weight of 100,000 and 5 parts by weight of polypropylene with an average particle size of 15 μm and a specific surface area of ​​14.81 m 2 / g of aluminum powder, 1 part by weight of paraffin wax, 1 part by weight of styrene-butadiene-styrene block copolymer, 4 parts by weight of silane coupling agent, 0.3 parts by weight of tris(2,4-di-tert-butylphenyl) phosphite and 7 parts by weight of elastomer POE are added into a high-speed mixer and fully mixed to obtain a preliminary mixed material;

[0041] (2) The obtained preliminary mixed material is melt-extruded at 220° C. through a twin-screw extruder, and then cast into a film at 30° C. to obtain a PP decorative film with a metallic texture.

[0042] Example 4

[0043] A method for preparing a PP decorative film with a metallic texture comprises the following steps:

[0044] (1) Prepare 100 parts by weight of isotactic polypropylene with a molecular weight of 100,000 and 3 parts by weight of polypropylene with an average particle size of 10 μm and a specific surface area of ​​22.22 m 2 / g of aluminum powder, 0.5 parts by weight of paraffin wax, 1 part by weight of styrene-butadiene-styrene block copolymer, 4 parts by weight of silane coupling agent, 0.3 parts by weight of tris(2,4-di-tert-butylphenyl) phosphite and 7 parts by weight of elastomer POE are added into a high-speed mixer and fully mixed to obtain a preliminary mixed material;

[0045] (2) The obtained preliminary mixed material is melt-extruded at 220° C. through a twin-screw extruder, and then cast into a film at 30° C. to obtain a PP decorative film with a metallic texture.

[0046] Example 5

[0047] A method for preparing a PP decorative film with a metallic texture comprises the following steps:

[0048] (1) Prepare 100 parts by weight of isotactic polypropylene with a molecular weight of 100,000 and 5 parts by weight of polypropylene with an average particle size of 10 μm and a specific surface area of ​​22.22 m 2 / g of aluminum powder, 1.5 parts by weight of paraffin wax, 1 part by weight of styrene-butadiene-styrene block copolymer, 4 parts by weight of silane coupling agent, 0.3 parts by weight of tris(2,4-di-tert-butylphenyl) phosphite and 7 parts by weight of elastomer POE are added into a high-speed mixer and fully mixed to obtain a preliminary mixed material;

[0049] (2) The obtained preliminary mixed material is melt-extruded at 220° C. through a twin-screw extruder, and then cast into a film at 30° C. to obtain a PP decorative film with a metallic texture.

[0050] Example 6

[0051] A method for preparing a PP decorative film with a metallic texture comprises the following steps:

[0052] (1) Prepare 100 parts by weight of isotactic polypropylene with a molecular weight of 100,000 and 5 parts by weight of polypropylene with an average particle size of 10 μm and a specific surface area of ​​22.22 m 2 / g of aluminum powder, 2 parts by weight of paraffin wax, 1 part by weight of styrene-butadiene-styrene block copolymer, 4 parts by weight of silane coupling agent, 0.3 parts by weight of tris(2,4-di-tert-butylphenyl)phosphite and 7 parts by weight of elastomer POE are added into a high-speed mixer and fully mixed to obtain a preliminary mixed material;

[0053] (2) The obtained preliminary mixed material is melt-extruded at 220° C. through a twin-screw extruder, and then cast into a film at 30° C. to obtain a PP decorative film with a metallic texture.

[0054] Example 7

[0055] A method for preparing a PP decorative film with a metallic texture comprises the following steps:

[0056] (1) Prepare 100 parts by weight of isotactic polypropylene with a molecular weight of 100,000 and 5 parts by weight of polypropylene with an average particle size of 10 μm and a specific surface area of ​​22.22 m 2 / g of aluminum powder, 2 parts by weight of polypropylene wax, 1 part by weight of styrene-butadiene-styrene block copolymer, 4 parts by weight of silane coupling agent, 0.3 parts by weight of tris(2,4-di-tert-butylphenyl)phosphite and 7 parts by weight of elastomer POE are added into a high-speed mixer and fully mixed to obtain a preliminary mixed material;

[0057] (2) The obtained preliminary mixed material is melt-extruded at 220° C. through a twin-screw extruder, and then cast into a film at 30° C. to obtain a PP decorative film with a metallic texture.

[0058] Example 8

[0059] A method for preparing a PP decorative film with a metallic texture comprises the following steps:

[0060] (1) Prepare 100 parts by weight of isotactic polypropylene with a molecular weight of 100,000 and 5 parts by weight of polypropylene with an average particle size of 10 μm and a specific surface area of ​​22.22 m 2 / g of aluminum powder, 2 parts by weight of pentaerythritol stearate, 1 part by weight of styrene-butadiene-styrene block copolymer, 4 parts by weight of silane coupling agent, 0.3 parts by weight of tris(2,4-di-tert-butylphenyl)phosphite and 7 parts by weight of elastomer POE are added into a high-speed mixer and fully mixed to obtain a preliminary mixed material;

[0061] (2) The obtained preliminary mixed material is melt-extruded at 220° C. through a twin-screw extruder, and then cast into a film at 30° C. to obtain a PP decorative film with a metallic texture.

[0062] Example 9

[0063] A method for preparing a PP decorative film with a metallic texture comprises the following steps:

[0064] (1) Prepare 100 parts by weight of isotactic polypropylene with a molecular weight of 100,000 and 5 parts by weight of polypropylene with an average particle size of 10 μm and a specific surface area of ​​22.22 m 2 / g of aluminum powder, 2 parts by weight of pentaerythritol calcium stearate, 1 part by weight of styrene-butadiene-styrene block copolymer, 4 parts by weight of silane coupling agent, 0.3 parts by weight of tris(2,4-di-tert-butylphenyl) phosphite and 7 parts by weight of elastomer POE are added into a high-speed mixer and fully mixed to obtain a preliminary mixed material;

[0065] (2) The obtained preliminary mixed material is melt-extruded at 220° C. through a twin-screw extruder, and then cast into a film at 30° C. to obtain a PP decorative film with a metallic texture.

[0066] Example 10

[0067] A method for preparing a PP decorative film with a metallic texture comprises the following steps:

[0068] (1) Prepare 100 parts by weight of isotactic polypropylene with a molecular weight of 100,000 and 3 parts by weight of polypropylene with an average particle size of 10 μm and a specific surface area of ​​22.2 m 2 / g of aluminum powder, 1 part by weight of paraffin wax, 1 part by weight of maleic anhydride grafted polypropylene, 4 parts by weight of silane coupling agent, 0.3 parts by weight of tris(2,4-di-tert-butylphenyl)phosphite and 7 parts by weight of elastomer POE are added into a high-speed mixer and fully mixed to obtain a preliminary mixed material;

[0069] (2) The obtained preliminary mixed material is melt-extruded at 220° C. through a twin-screw extruder, and then cast into a film at 30° C. to obtain a PP decorative film with a metallic texture.

[0070] Embodiment 11

[0071] A method for preparing a PP decorative film with a metallic texture comprises the following steps:

[0072] (1) Prepare 100 parts by weight of isotactic polypropylene with a molecular weight of 100,000 and 3 parts by weight of polypropylene with an average particle size of 10 μm and a specific surface area of ​​22.2 m 2 / g of aluminum powder, 1 part by weight of paraffin wax, 1 part by weight of maleic anhydride grafted polypropylene, 4 parts by weight of aluminate coupling agent, 0.3 parts by weight of tris(2,4-di-tert-butylphenyl) phosphite and 7 parts by weight of elastomer POE are added into a high-speed mixer and fully mixed to obtain a preliminary mixed material;

[0073] (2) The obtained preliminary mixed material is melt-extruded at 220° C. through a twin-screw extruder, and then cast into a film at 30° C. to obtain a PP decorative film with a metallic texture.

[0074] Example 12

[0075] A method for preparing a PP decorative film with a metallic texture comprises the following steps:

[0076] (1) Prepare 100 parts by weight of isotactic polypropylene with a molecular weight of 100,000 and 3 parts by weight of polypropylene with an average particle size of 10 μm and a specific surface area of ​​22.2 m 2 / g of aluminum powder, 1 part by weight of paraffin wax, 1 part by weight of maleic anhydride grafted polypropylene, 4 parts by weight of aluminate coupling agent, 0.3 parts by weight of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate and 7 parts by weight of elastomer POE are added into a high-speed mixer and fully mixed to obtain a preliminary mixed material;

[0077] (2) The obtained preliminary mixed material is melt-extruded at 220° C. through a twin-screw extruder, and then cast into a film at 30° C. to obtain a PP decorative film with a metallic texture.

[0078] Example 13

[0079] A method for preparing a PP decorative film with a metallic texture comprises the following steps:

[0080] (1) Prepare 100 parts by weight of isotactic polypropylene with a molecular weight of 100,000 and 3 parts by weight of polypropylene with an average particle size of 10 μm and a specific surface area of ​​22.2 m 2 / g of aluminum powder, 1 part by weight of paraffin wax, 1 part by weight of maleic anhydride grafted polypropylene, 4 parts by weight of aluminate coupling agent, 0.3 parts by weight of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate and 7 parts by weight of elastomer EPDM are added into a high-speed mixer and fully mixed to obtain a preliminary mixed material;

[0081] (2) The obtained preliminary mixed material is melt-extruded at 220° C. through a twin-screw extruder, and then cast into a film at 30° C. to obtain a PP decorative film with a metallic texture.

[0082] Comparative Example 1

[0083] The preparation method of this comparative example is the same as that of Example 1, except that no dispersant paraffin is added.

[0084] Comparative Example 2

[0085] The preparation method of this comparative example is the same as that of Example 1, except that the compatibilizer styrene-butadiene-styrene block copolymer is not added.

[0086] Performance Testing

[0087] The PP decorative films of Examples 1-13 and Comparative Examples 1 and 2 were laminated onto a metal aluminum plate, and the surface smoothness, elongation, surface hardness, impact strength and bending test were tested.

[0088] Surface roughness: Tested according to GB3505-83.

[0089] Elongation test: According to ASTM E643-09 test, a certain force is applied to the fixed pin in the thickness direction of the sample using the Erickson device to check the pressing depth before cracks appear.

[0090] Surface hardness: Tested according to ASTM D3363.

[0091] Impact strength: tested according to GB / T 229-2007.

[0092] Bending test: Tested according to GB / T232-2010.

[0093] The test results are shown in Table 1:

[0094]

[0095]

[0096] According to the data in Table 1, the PP decorative film with metallic texture prepared by the melt extrusion casting integrated molding process in this application has a glossy surface, which can effectively avoid the delamination of the aluminum layer, has high impact resistance, and will not crack when bent 180 degrees.

[0097] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A PP decorative film with metallic texture, characterized by: The invention comprises polypropylene, aluminum powder and composite additives, wherein the composite additives include a dispersant, a compatibilizer, a coupling agent, an antioxidant and a toughening agent; Wherein, relative to 100 parts by weight of the polypropylene, the amount of the aluminum powder is 1.5 to 5 parts by weight, the amount of the dispersant is 0.5 to 2 parts by weight, the amount of the compatibilizer is 0.5 to 2 parts by weight, the amount of the coupling agent is 2 to 6 parts by weight, the amount of the antioxidant is 0.1 to 0.5 parts by weight, and the amount of the toughening agent is 5 to 10 parts by weight.

2. The PP decorative film with metallic texture according to claim 1, characterized in that: The polypropylene is selected from isotactic polypropylene with a molecular weight of 80,000 to 150,000.

3. The PP decorative film with metallic texture according to claim 1, characterized in that: The average particle size of the aluminum powder is 3 to 15 μm, and the specific surface area of ​​the aluminum powder is 14.81 to 66.7 m 2 / g.

4. The PP decorative film with metallic texture according to claim 1, characterized in that: The dispersant is selected from at least one of paraffin wax, polypropylene wax, pentaerythritol stearate and pentaerythritol calcium stearate.

5. The PP decorative film with metallic texture according to claim 1, characterized in that: The compatibilizer is selected from styrene-butadiene-styrene block copolymer and / or maleic anhydride grafted polypropylene.

6. The PP decorative film with metallic texture according to claim 1, characterized in that: The coupling agent is selected from at least one of an aluminate coupling agent, a borate coupling agent, a silane coupling agent or a titanate coupling agent.

7. The PP decorative film with metallic texture according to claim 1, characterized in that: The antioxidant is at least one selected from tris(2,4-di-tert-butylphenyl)phosphite, pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate and bis(2,4-di-tert-butylphenyl)pentaerythritol diphosphite.

8. The PP decorative film with metallic texture according to claim 1, characterized in that: The toughening agent is selected from elastomer POE and / or elastomer EPDM.

9. A method for preparing a PP decorative film with metallic texture according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1. Add polypropylene, aluminum powder, dispersant, compatibilizer, coupling agent, antioxidant and toughening agent into a high-speed mixer and mix to obtain a preliminary mixed material; S2. The preliminary mixed material is melt-extruded through a twin-screw extruder and cast into a film to obtain the PP decorative film with a metallic texture.

10. The method for preparing a PP decorative film with metallic texture according to claim 9, characterized in that: The temperature of the melt extrusion is 200-250°C, and the temperature of the cast film is 20-45°C.

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