Scratch-proof polypropylene film for packaging and preparation process thereof

Abstract

The invention provides an anti-scratch polypropylene film for packaging and a preparation process, the film comprises an anti-scratch layer, a core layer and an anti-adhesion layer which are arranged in sequence, and the anti-scratch layer is prepared from the following components in percentage by mass: 80-90% of homo-polypropylene and 10-20% of an anti-scratch agent; the core layer is prepared from the following components in percentage by mass: 98 to 99 percent of homo-polypropylene and 1 to 2 percent of antistatic agent; and the anti-adhesion layer is prepared from the following components in percentage by mass: 95-97% of homo-polypropylene and 3-5% of an anti-adhesion material. According to the embodiment of the invention, scratch can be prevented in the packaging process, and the aesthetic property of the film is ensured on the basis of ensuring the performance of the film.

Description

Technical Field

[0001] The present disclosure relates to the technical field of composite films, and specifically, to a scratch-resistant polypropylene film for packaging. Background Art

[0002] Currently, films for packaging on the market are often scratched during the packaging process, affecting their performance and aesthetics. Summary of the Invention

[0003] An object of an embodiment of the present disclosure is to provide a scratch-resistant polypropylene film for packaging and a preparation process thereof to solve the above problems existing in the prior art.

[0004] To solve the above technical problems, an embodiment of the present disclosure provides a scratch-resistant polypropylene film for packaging, which includes a scratch-resistant layer, a core layer, and an anti-blocking layer arranged in sequence. The scratch-resistant layer is composed of the following components by mass percentage: 80-90% of homopolypropylene and 10-20% of a scratch-resistant agent; the core layer is composed of the following components by mass percentage: 98-99% of homopolypropylene and 1-2% of an antistatic agent; the anti-blocking layer is composed of the following components by mass percentage: 95-97% of homopolypropylene and 3-5% of an anti-blocking material.

[0005] In some embodiments, the degree of polymerization of the homopolypropylene is 60-80%, and the melt index is 1.0-4.0 g / 10 min.

[0006] In some embodiments, the scratch-resistant agent is ultra-high molecular weight polyethylene.

[0007] In some embodiments, the molecular weight of the ultra-high molecular weight polyethylene is 500,000-1.5 million.

[0008] In some embodiments, the antistatic agent is ethoxylated alkylamine.

[0009] In some embodiments, the anti-blocking material is composed of homopolypropylene and organic microspheres.

[0010] In some embodiments, the anti-blocking material is composed of the following components by mass percentage: 60-80% of homopolypropylene and 20-40% of organic microspheres.

[0011] In some embodiments, the particle size of the organic microspheres is 1-4 μm.

[0012] Another aspect of an embodiment of the present disclosure provides a preparation process for a scratch-resistant polypropylene film for packaging, which is used to prepare the scratch-resistant polypropylene film for packaging described in any one of the above, and the preparation process includes the following steps:

[0013] Mix the raw materials for preparing the upper surface layer evenly, add them to the first auxiliary extruder, and heat to the molten state, so as to obtain the upper surface layer melt through extrusion; mix the raw materials for preparing the intermediate layer evenly, add them to the main extruder, and heat to the molten state, so as to obtain the intermediate layer melt through extrusion; mix the raw materials for preparing the lower surface layer evenly, add them to the second auxiliary extruder, and heat to the molten state, so as to obtain the lower surface layer melt through extrusion.

[0014] Filter the upper surface layer melt, the intermediate layer melt, and the lower surface layer melt respectively through filters, and extrude them into a thick sheet after converging at the die head.

[0015] Attach the thick sheet to a quench roll for rapid cooling to form a cast sheet.

[0016] Stretch the cast sheet longitudinally and then transversely to form a film.

[0017] In some embodiments, it further includes:

[0018] Shape and cool the film, measure its thickness with a thickness gauge, trim the edges, perform corona treatment, eliminate static electricity, and finally wind it up to obtain the finished product.

[0019] The embodiments of the present disclosure can prevent scratches during the packaging process, and ensure the aesthetics of the film on the basis of ensuring its performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments recorded in the present disclosure. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0021] Figure 1 It is a schematic structural diagram of an anti-scratch polypropylene film for packaging in the embodiments of the present disclosure. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] Reference is made herein to the various solutions and features of the present disclosure with reference to the drawings.

[0023] It should be understood that various modifications can be made to the embodiments applied herein. Therefore, the above description should not be regarded as a limitation, but only as an example of the embodiments. Those skilled in the art will think of other modifications within the scope and spirit of the present disclosure.

[0024] The drawings included in the specification and constituting a part of the specification illustrate the embodiments of the present disclosure, and are used together with the general description of the present disclosure given above and the detailed description of the embodiments given below to explain the principles of the present disclosure.

[0025] These and other features of the present disclosure will become apparent from the following description of the preferred forms of the embodiments given by way of non - limiting examples with reference to the accompanying drawings.

[0026] It should also be understood that although the present disclosure has been described with reference to some specific examples, those skilled in the art can surely implement many other equivalent forms of the present disclosure, which have the features as described in the claims and thus are all within the scope of protection defined thereby.

[0027] When combined with the accompanying drawings, the above - mentioned and other aspects, features and advantages of the present disclosure will become more apparent in view of the following detailed description.

[0028] Specific embodiments of the present disclosure are hereinafter described with reference to the accompanying drawings; however, it should be understood that the embodiments claimed are merely examples of the present disclosure, which can be implemented in various ways. Well - known and / or repetitive functions and structures are not described in detail to avoid obscuring the present disclosure with unnecessary or redundant details. Therefore, the specific structural and functional details claimed herein are not intended to be limiting, but are merely used as a basis for the claims and a representative basis for teaching those skilled in the art to make any suitable.

[0029] The first embodiment of the present disclosure provides a scratch - resistant polypropylene film for packaging, which includes a scratch - resistant layer 1, a core layer 2, and an anti - sticking layer 3 arranged in sequence. The scratch - resistant layer 1 serves as the upper surface layer of the scratch - resistant polypropylene film for packaging, and it is composed of the following components by mass percentage: 80 - 90% of homopolypropylene and 10 - 20% of a scratch - resistant agent. Here, the scratch - resistant agent is ultra - high - molecular - weight polyethylene. Preferably, the molecular weight of the ultra - high - molecular - weight polyethylene is 500,000 - 1,500,000.

[0030] Further, the degree of polymerization of the homopolypropylene in the scratch - resistant layer 1 is 60 - 80%, and the melt index is 1.0 - 4.0 g / 10min.

[0031] Further, the core layer 2 serves as the intermediate layer of the scratch - resistant polypropylene film for packaging, and it is composed of the following components by mass percentage: 98 - 99% of homopolypropylene and 1 - 2% of an antistatic agent; wherein, the antistatic agent is ethoxylated alkylamine.

[0032] Further, the anti - sticking layer 3 serves as the lower surface layer of the scratch - resistant polypropylene film for packaging, and it is composed of the following components by mass percentage: 95 - 97% of homopolypropylene and 3 - 5% of an anti - sticking material; wherein, the raw material of the anti - sticking material consists of homopolypropylene and organic microspheres.

[0033] In another embodiment, the anti-blocking material is composed of the following components by mass percentage: 60-80% of homopolypropylene and 20-40% of organic microspheres; wherein, the particle size of the organic microspheres is 1-4 μm.

[0034] In a specific embodiment of a scratch-resistant polypropylene film for packaging, it includes a scratch-resistant layer 1, a core layer 2, and an anti-blocking layer 3 arranged in sequence. The scratch-resistant layer 1 is composed of the following components by mass percentage: 90% of homopolypropylene and 10% of a scratch-resistant agent. The scratch-resistant agent is ultra-high molecular weight polyethylene with a molecular weight of 1.5 million; the degree of polymerization of the homopolypropylene in the scratch-resistant layer 1 is 80%, and the melt index is 4.0 g / 10 min; the core layer 2 is composed of the following components by mass percentage: 99% of homopolypropylene and 1% of an antistatic agent; the anti-blocking layer 3 is composed of the following components by mass percentage: 97% of homopolypropylene and 3% of an anti-blocking material. Among them, the anti-blocking material is composed of the following components by mass percentage: 80% of homopolypropylene and 20% of organic microspheres; wherein, the particle size of the organic microspheres is 20 μm.

[0035] The embodiments of the present disclosure can prevent scratching during the packaging process, and on the basis of ensuring its performance, ensure the aesthetics of the film.

[0036] The second embodiment of the present disclosure provides a preparation process for a scratch-resistant polypropylene film for packaging, which is used to prepare the scratch-resistant polypropylene film in the first embodiment above. The preparation process includes the following steps:

[0037] S101, Mix the raw materials for preparing the upper surface layer evenly, add them to the first auxiliary extruder and heat to the molten state, so as to obtain the upper surface layer melt by extrusion; Mix the raw materials for preparing the intermediate layer evenly, add them to the main extruder and heat to the molten state, so as to obtain the intermediate layer melt by extrusion; Mix the raw materials for preparing the lower surface layer evenly, add them to the second auxiliary extruder and heat to the molten state, so as to obtain the lower surface layer melt by extrusion;

[0038] S102, Filter the upper surface layer melt, the intermediate layer melt, and the lower surface layer melt respectively, and extrude them to form a thick sheet after converging at the die head;

[0039] S103, Attach the thick sheet to a chill roll for rapid cooling to form a cast sheet;

[0040] S104. Stretch the cast sheet longitudinally and then transversely to form a film. Specifically, subject the cast sheet formed in step S103 to a biaxial stretching process by passing it through a machine direction orientation (MDO) device and a transverse direction orientation (TDO) device in sequence to generate a film body.

[0041] In addition, the preparation process further includes:

[0042] S105. Shape and cool the film, measure its thickness with a thickness gauge, trim the edges, perform corona treatment, eliminate static electricity, and finally wind it up to obtain the finished product.

[0043] The film of the embodiments of the present disclosure is based on a single material, which is convenient for recycling. At the same time, its outer surface has excellent mechanical properties and can effectively prevent scratches.

[0044] The embodiments of the present disclosure can prevent scratches during the packaging process and ensure the aesthetics of the film while ensuring its performance.

[0045] In addition, the features of the embodiments shown in the drawings of the present application or various embodiments mentioned in this specification do not have to be understood as independent embodiments. Instead, each feature described in one example of an embodiment can be combined with one or more other desired features from other embodiments to generate other embodiments not described in words or with reference to the drawings.

[0046] The above-described embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit them. Although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A scratch-resistant polypropylene film for packaging, characterized in that: The invention comprises an anti-scratch layer, a core layer and an anti-adhesion layer which are arranged in sequence. The anti-scratch layer is composed of the following components in mass percentage: 80-90% of homopolypropylene and 10-20% of an anti-scratch agent; the core layer is composed of the following components in mass percentage: 98-99% of homopolypropylene and 1-2% of an antistatic agent; the anti-adhesion layer is composed of the following components in mass percentage: 95-97% of homopolypropylene and 3-5% of an anti-adhesion material.

2. The anti-scratch polypropylene film for packaging according to claim 1, characterized in that: The homopolypropylene has a polymerization degree of 60-80% and a melt index of 1.0-4.0 g / 10 min.

3. The anti-scratch polypropylene film for packaging according to claim 2, characterized in that: The anti-scratch agent is ultra-high molecular weight polyethylene.

4. The anti-scratch polypropylene film for packaging according to claim 3, characterized in that: The molecular weight of the ultra-high molecular weight polyethylene is 500,000-1.5 million.

5. The anti-scratch polypropylene film for packaging according to claim 2, characterized in that: The antistatic agent is an ethoxylated alkylamine.

6. The anti-scratch polypropylene film for packaging according to claim 2, characterized in that: The anti-adhesion material consists of homopolymerized polypropylene and organic microspheres.

7. The anti-scratch polypropylene film for packaging according to claim 6, characterized in that: The anti-adhesion material is composed of the following components in percentage by mass: 60-80% of homopolypropylene and 20-40% of organic microspheres.

8. The anti-scratch polypropylene film for packaging according to claim 7, characterized in that: The particle size of the organic microspheres is 1-4 μm.

9. A process for preparing a scratch-resistant polypropylene film for packaging, characterized in that: The method is used to prepare the anti-scratch polypropylene film for packaging according to any one of claims 1 to 8, and the preparation process comprises the following steps: The raw materials for preparing the upper surface layer are mixed uniformly and added to the first auxiliary extruder and heated to a molten state, thereby obtaining an upper surface layer melt by extrusion; the raw materials for preparing the middle layer are mixed uniformly and added to the main extruder and heated to a molten state, thereby obtaining an middle layer melt by extrusion; the raw materials for preparing the lower surface layer are mixed uniformly and added to the second auxiliary extruder and heated to a molten state, thereby obtaining a lower surface layer melt by extrusion; The upper surface layer melt, the middle layer melt and the lower surface layer melt are filtered through filters respectively, and after merging at a die head, they are extruded to form a thick sheet; The thick sheet is attached to a quenching roller for rapid cooling to form a cast sheet; The cast sheet is sequentially stretched in the longitudinal and transverse directions to form a film.

10. The process for preparing the anti-scratch polypropylene film for packaging according to claim 9, characterized in that: Also includes: The film is shaped and cooled, thickness is measured by a thickness gauge, edges are trimmed, corona treated, static electricity is eliminated, and finally rolled up to obtain a finished product.

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