Environment-friendly PVC composite film

Abstract

The utility model discloses an environmental protection PVC composite film, this environmental protection PVC composite film includes: base layer, first adhesive layer, second adhesive layer, first surface layer and second surface layer, first adhesive layer and second adhesive layer are correspondingly set respectively in the both sides surface of base layer, first surface layer is correspondingly set in the one side surface of first adhesive layer back to base layer, second surface layer is correspondingly set in the one side surface of second adhesive layer back to base layer, to form multilayer composite structure, base layer is set to be enhanced type modified PVC layer, first surface layer is set to be degradable ultraviolet resistance layer, second surface layer is set to be degradable barrier layer. The utility model discloses an environmental protection PVC composite film is based on the composite forming between base layer, first surface layer and second surface layer, and the degradable composite film with ultraviolet resistance function and water isolation function is obtained thereby, at the same time, while guaranteeing the functionality of PVC composite film, the degradability of PVC composite film is strengthened, and the environmental friendliness of PVC composite film is greatly improved.

Description

Technical Field

[0001] This utility model relates to the field of PVC composite film technology, and in particular to an environmentally friendly PVC composite film. Background Technology

[0002] PVC composite film is a multi-layered functional film made of polyvinyl chloride (PVC) as the base material, compounded with other materials (such as plastics, fibers, coatings, etc.). Its core characteristic is the combination of the inherent properties of PVC (such as flexibility and chemical resistance) with the reinforcing properties of other materials (such as barrier properties and biodegradability), thus meeting the specific needs of different application scenarios. Typical PVC composite films are usually produced using multi-layer co-extrusion or lamination processes, with common structures including: Top layer: functional coatings (such as UV-resistant, antibacterial, and printing layers); Middle layer: PVC matrix (containing plasticizers, stabilizers, fillers, etc.); Bottom layer: barrier layer or adhesive layer (such as PE, PET). Currently, the core material characteristics of PVC composite films are mainly based on the low cost, ease of processing, corrosion resistance, and flame retardant properties of the PVC base material, enabling these films to be widely used in food packaging, agricultural mulch films, medical protective films, and building material decorative films, etc. Furthermore, by incorporating other functional layers according to different application scenarios, they can be adaptively modified to obtain specific film products that meet application requirements.

[0003] However, although existing PVC composite films have various modification directions to meet a variety of application needs, their biodegradability is insufficient, resulting in poor environmental friendliness and making it difficult to meet the market's growing demand for the environmental performance of membrane products. Utility Model Content

[0004] Therefore, it is necessary to provide an environmentally friendly PVC composite film to address the technical problem of insufficient environmental friendliness of existing PVC composite films.

[0005] An environmentally friendly PVC composite film includes a base layer, a first adhesive layer, a second adhesive layer, a first surface layer, and a second surface layer. The first adhesive layer and the second adhesive layer are respectively disposed on the two sides of the base layer. The first surface layer is disposed on the side of the first adhesive layer facing away from the base layer, and the second surface layer is disposed on the side of the second adhesive layer facing away from the base layer, thereby forming a multi-layer composite structure.

[0006] The base layer is a reinforced modified PVC layer; the first surface layer is a biodegradable UV-resistant layer; and the second surface layer is a biodegradable barrier layer.

[0007] In one embodiment, both the first adhesive layer and the second adhesive layer are made of maleic anhydride-grafted PVC.

[0008] In one embodiment, the first surface layer described above is prepared and molded using a PLA / PBAT blend.

[0009] In one embodiment, the blending ratio of PLA to PBAT is 7:3.

[0010] In one embodiment, the first surface layer described above is doped with titanium dioxide nanoparticles.

[0011] In one embodiment, the incorporation amount of the above-mentioned titanium dioxide nanoparticles is 2-3%.

[0012] In one embodiment, the amount of titanium dioxide nanoparticles incorporated can be set to 2%, 2.1%, 2.2%, 2.3%, 2.4%, 2.5%, 2.6%, 2.7%, 2.8% or 3%.

[0013] In one embodiment, the thickness of the first surface layer is set to 10 ± 2 μm.

[0014] In one embodiment, the thickness of the first surface layer described above can be set to 8 μm, 9 μm, 10 μm, 11 μm or 12 μm.

[0015] In one embodiment, the second surface layer described above is a PBAT / nanomontmorillonite composite membrane.

[0016] In one embodiment, the montmorillonite content in the second surface layer is limited to 5%.

[0017] In one embodiment, the thickness of the second surface layer is set to 10 ± 2 μm.

[0018] In one embodiment, the thickness of the second surface layer described above can be set to 8 μm, 9 μm, 10 μm, 11 μm or 12 μm.

[0019] In one embodiment, the aforementioned base layer is prepared and molded using a mixture of environmentally friendly PVC and bamboo fiber reinforcement.

[0020] In one embodiment, the length of the bamboo fiber is limited to 0.5-1 mm.

[0021] In one embodiment, the bamboo fiber content is limited to 8%.

[0022] In one embodiment, the thickness of the base layer is set to 70±5μm.

[0023] In one embodiment, the thickness of the second surface layer can be set to 65μm, 66μm, 67μm, 68μm, 69μm, 70μm, 71μm, 72μm, 73μm, 74μm or 75μm.

[0024] In one embodiment, the grafting rate of maleic anhydride-grafted PVC in the first adhesive layer is controlled to be 1.2-1.5%.

[0025] In one embodiment, the thickness of the first adhesive layer is set to 5 ± 1 μm.

[0026] In one embodiment, the thickness of the first adhesive layer described above can be set to 4 μm, 5 μm or 6 μm.

[0027] In one embodiment, the second adhesive layer described above has the same structure as the first adhesive layer.

[0028] The aforementioned environmentally friendly PVC composite film uses a reinforced modified PVC layer as the base layer to provide basic structural strength; a biodegradable UV-resistant layer as the first surface layer to provide UV protection; and a biodegradable barrier layer as the second surface layer to provide waterproofing. Based on these configurations, both the first and second adhesive layers are made of maleic anhydride-grafted PVC to enhance the interlayer adhesion between the base layer and the first and second surface layers. Thus, the environmentally friendly PVC composite film of this invention, formed by the composite of the base layer, the first surface layer, and the second surface layer, yields a biodegradable composite film with both UV protection and waterproofing capabilities. This meets the market's high demand for PVC films in terms of UV resistance and waterproofing, while simultaneously enhancing the biodegradability of the PVC composite film and significantly improving its environmental friendliness. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of an environmentally friendly PVC composite film in one embodiment;

[0030] Figure 2 This is a schematic diagram of the exploded structure of an environmentally friendly PVC composite film in one embodiment. Detailed Implementation

[0031] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0032] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0033] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0034] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0035] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0036] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0037] Please see Figures 1 to 2 This utility model discloses an environmentally friendly PVC composite film 1, which includes a base layer 10, a first adhesive layer 20, a second adhesive layer 30, a first surface layer 40, and a second surface layer 50. The first adhesive layer 20 and the second adhesive layer 30 are respectively disposed on both sides of the base layer 10, the first surface layer 40 is disposed on the side of the first adhesive layer 20 facing away from the base layer 10, and the second surface layer 50 is disposed on the side of the second adhesive layer 30 facing away from the base layer 10, thereby forming a multi-layer composite structure. Specifically, the base layer 10 is configured as a reinforced modified PVC layer to provide basic structural strength for the environmentally friendly PVC composite film; the first surface layer 40 is configured as a biodegradable UV-resistant layer to provide UV protection for the environmentally friendly PVC composite film; and the second surface layer 50 is configured as a biodegradable barrier layer to provide water-resistant properties for the environmentally friendly PVC composite film. Based on the above configuration, more specifically, both the first adhesive layer 20 and the second adhesive layer 30 are configured as maleic anhydride-grafted PVC to improve the interlayer adhesion strength between the base layer 10 and the first surface layer 40 and the second surface layer 50. Therefore, the environmentally friendly PVC composite film of this utility model is based on the composite molding between the base layer 10, the first surface layer 40 and the second surface layer 50, thereby obtaining a biodegradable composite film with anti-ultraviolet and waterproof functions, so as to meet the high demand of the market for PVC film in terms of anti-ultraviolet and waterproof capabilities. At the same time, while ensuring the functionality of the PVC composite film, the biodegradability of the PVC composite film is enhanced, greatly improving the environmental friendliness of the PVC composite film.

[0038] Furthermore, the first surface layer 40 is prepared and molded using a PLA / PBAT blend to enhance its biodegradability. Both PLA (polylactic acid) and PBAT (polybutylene succinate) are biodegradable plastics. The blend formed by their mixing can rapidly decompose into environmentally friendly substances such as carbon dioxide and water in the natural environment, thereby reducing environmental pollution. In one embodiment, the blending ratio of PLA to PBAT is 7:3.

[0039] Furthermore, in one embodiment, titanium dioxide nanoparticles are incorporated into the first surface layer 40 to enhance its UV resistance. In another embodiment, the amount of titanium dioxide nanoparticles incorporated is 2-3%. In some embodiments, the amount of titanium dioxide nanoparticles incorporated can be set to 2%, 2.1%, 2.2%, 2.3%, 2.4%, 2.5%, 2.6%, 2.7%, 2.8%, or 3%.

[0040] Furthermore, in one embodiment, the thickness of the first surface layer 40 is set to 10 ± 2 μm. In some embodiments, the thickness of the first surface layer 40 may be set to 8 μm, 9 μm, 10 μm, 11 μm, or 12 μm.

[0041] Furthermore, the second surface layer 50 employs a PBAT / nano-montmorillonite composite membrane to enhance its water vapor barrier capability. In one embodiment, the montmorillonite content in the second surface layer 50 is limited to 5%.

[0042] Furthermore, in one embodiment, the thickness of the second surface layer 50 is set to 10 ± 2 μm. In some embodiments, the thickness of the second surface layer 50 may be set to 8 μm, 9 μm, 10 μm, 11 μm, or 12 μm.

[0043] Furthermore, the base layer 10 is prepared and molded using a mixture of environmentally friendly PVC and bamboo fiber reinforcement. In one embodiment, the length of the bamboo fiber is limited to 0.5-1 mm. In another embodiment, the bamboo fiber content is limited to 8%, thereby enhancing the tensile strength and puncture resistance of the base layer 10.

[0044] Furthermore, in one embodiment, the thickness of the base layer 10 is set to 70±5μm. In some embodiments, the thickness of the second surface layer 50 may be set to 65μm, 66μm, 67μm, 68μm, 69μm, 70μm, 71μm, 72μm, 73μm, 74μm, or 75μm.

[0045] Furthermore, in one embodiment, the grafting rate of maleic anhydride-grafted PVC in the first adhesive layer 20 is controlled to be 1.2-1.5%. In another embodiment, the thickness of the first adhesive layer 20 is set to 5±1 μm. In some embodiments, the thickness of the first adhesive layer 20 may be set to 4 μm, 5 μm, or 6 μm.

[0046] Furthermore, in one embodiment, the second adhesive layer 30 has the same structure as the first adhesive layer 20.

[0047] In summary, the environmentally friendly PVC composite film disclosed in this invention uses a reinforced modified PVC layer as the base layer to provide basic structural strength for the environmentally friendly PVC composite film; a biodegradable UV-resistant layer as the first surface layer to provide UV protection; and a biodegradable barrier layer as the second surface layer to provide water-resistant properties. Based on the above configuration, both the first and second adhesive layers are made of maleic anhydride-grafted PVC to enhance the interlayer adhesion strength between the base layer and the first and second surface layers. Therefore, the environmentally friendly PVC composite film of this invention, based on the composite molding of the base layer, the first surface layer, and the second surface layer, yields a biodegradable composite film with both UV protection and water-resistant properties, meeting the market's high demand for PVC films in terms of UV resistance and waterproofing. Simultaneously, while ensuring the functionality of the PVC composite film, its biodegradability is enhanced, significantly improving its environmental friendliness.

[0048] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0049] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. An environmentally friendly PVC composite film, characterized in that, include: The base layer, the first adhesive layer, the second adhesive layer, the first surface layer, and the second surface layer are respectively disposed on the two sides of the base layer, the first surface layer is disposed on the side of the first adhesive layer facing away from the base layer, and the second surface layer is disposed on the side of the second adhesive layer facing away from the base layer, thereby forming a multi-layer composite structure. The base layer is a reinforced modified PVC layer; the first surface layer is a biodegradable UV-resistant layer; and the second surface layer is a biodegradable barrier layer.

2. The environmentally friendly PVC composite film according to claim 1, characterized in that, The first surface layer was prepared and shaped using a PLA / PBAT blend.

3. The environmentally friendly PVC composite film according to claim 2, characterized in that, The first surface layer is doped with titanium dioxide nanoparticles.

4. The environmentally friendly PVC composite film according to claim 3, characterized in that, The thickness of the first surface layer is set to 10±2μm.

5. The environmentally friendly PVC composite film according to claim 4, characterized in that, The second surface layer uses a PBAT / nanomontmorillonite composite membrane.

6. The environmentally friendly PVC composite film according to claim 5, characterized in that, The thickness of the second surface layer is set to 10±2μm.

7. The environmentally friendly PVC composite film according to claim 6, characterized in that, The base layer is made of environmentally friendly PVC and bamboo fiber reinforced mixture.

8. The environmentally friendly PVC composite film according to claim 7, characterized in that, The base layer thickness is set to 70±5μm.

9. The environmentally friendly PVC composite film according to claim 8, characterized in that, The thickness of the first adhesive layer is set to 5±1μm.

10. The environmentally friendly PVC composite film according to claim 9, characterized in that, The second adhesive layer has the same structure as the first adhesive layer.

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