Ultraviolet-proof film

Abstract

The utility model belongs to the technical field of ultraviolet-proof films, and particularly relates to an ultraviolet-proof film which comprises an outermost layer, the outermost layer is a structural layer formed by compounding polytetrafluoroethylene and nano silicon dioxide, an ultraviolet-proof layer is arranged on the inner side of the outermost layer, a gas barrier layer is arranged on the inner side of the ultraviolet-proof layer, and the gas barrier layer is arranged on the outer side of the outermost layer. The inner side of the gas barrier layer is provided with an electric conduction and heat conduction layer, and the inner side of the electric conduction and heat conduction layer is provided with a bonding affinity layer. According to the utility model, the outermost polytetrafluoroethylene and nano silicon dioxide composite material is anti-pollution and wear-resistant and protects the internal structure, the ultraviolet-proof layer effectively blocks ultraviolet rays and prevents articles from aging, the gas barrier layer can prevent gas such as oxygen from permeating and prolong the shelf life of the articles such as food, and the electric conduction and heat conduction layer can realize electric conduction and heat conduction so as to meet the requirements of electronic equipment; and the bonding affinity layer can firmly bond other materials, and multiple layers are cooperated, so that the film integrates multiple functions, the problem of insufficient comprehensive performance of the traditional film is solved, and the application range is expanded.

Description

Technical Field

[0001] This utility model relates to the field of ultraviolet film technology, specifically to an anti-ultraviolet film. Background Technology

[0002] In many fields today, the requirements for the protective performance of materials are becoming increasingly stringent, and thin films, as a widely used material form, face numerous challenges. Traditional single-layer thin films have serious limitations in terms of UV protection, gas barrier properties, electrical and thermal conductivity, and adhesion stability.

[0003] In the field of UV protection, early films mostly relied on simply adding UV absorbers to a general polymer matrix. However, films prepared in this way are prone to UV absorption and decomposition when exposed to UV radiation for extended periods, leading to a rapid decline in UV blocking effectiveness and failing to provide durable and reliable protection for underlying materials. For example, in applications such as outdoor architectural films and agricultural greenhouse films, after a period of use, problems frequently arise due to UV blocking failure, such as accelerated aging of building interiors and reduced crop yields caused by UV damage.

[0004] While common films such as polyethylene and polypropylene offer some physical barrier properties for gas separation, their efficiency in blocking gases like oxygen and carbon dioxide is extremely low. In industries like food packaging, ordinary films are insufficient to prevent oxygen penetration, leading to food oxidation, spoilage, flavor loss, and shortened shelf life. Traditional polyvinylidene chloride (PVDC) gas barrier layers offer acceptable barrier performance, but pose environmental risks, limiting their application in regions or scenarios with stringent environmental regulations.

[0005] With the miniaturization and high performance of electronic devices, the demand for the electrical and thermal conductivity of thin films is becoming increasingly prominent. Previously, metal foils or simple metal-filled polymers were used to meet these requirements. However, metal foils are inflexible, easily damaged, and difficult to adapt to complex shapes; metal-filled polymers face problems such as metal oxidation and particle agglomeration, resulting in unstable electrical and thermal conductivity, affecting the heat dissipation and electromagnetic shielding effects of electronic components, and thus limiting the expansion of thin films' applications in the electronics field.

[0006] In bonding films to packaged items or other materials, traditional adhesive bonding methods are prone to failure in harsh environments such as high temperature and high humidity, causing the film to detach. Some simple adhesive layer materials cannot simultaneously ensure compatibility with materials of different properties, limiting the application range of films. For example, in fields such as medical packaging and precision instrument packaging, the requirements for bonding stability and compatibility are extremely high, which traditional bonding methods cannot meet.

[0007] In summary, existing thin film technologies are insufficient to simultaneously meet the high standards required by multiple fields for comprehensive performance such as UV protection, gas barrier, electrical and thermal conductivity, and adhesive affinity. There is an urgent need to develop a new type of multifunctional protective film, and thus the UV-protective film of this utility model has emerged. Utility Model Content

[0008] (a) Technical problems to be solved

[0009] To address the shortcomings of existing technologies, this invention provides an anti-ultraviolet film, which solves the problems mentioned in the background section.

[0010] (II) Technical Solution

[0011] To achieve the above objectives, this utility model specifically adopts the following technical solution:

[0012] An ultraviolet-protective film includes an outermost layer, which is a structural layer composed of polytetrafluoroethylene and nano-silica. An ultraviolet-protective layer is disposed on the inner side of the outermost layer. A gas barrier layer is disposed on the inner side of the ultraviolet-protective layer. A conductive and thermally conductive layer is disposed on the inner side of the gas barrier layer. An adhesive affinity layer is disposed on the inner side of the conductive and thermally conductive layer.

[0013] Furthermore, the UV-protective layer is a composite structure layer made of polyester with added hindered amine light stabilizers.

[0014] Furthermore, the gas barrier layer is a structural layer composed of ethylene-vinyl alcohol copolymer.

[0015] Furthermore, the conductive and thermally conductive layer uses a structural layer composed of polyimide filled with graphene.

[0016] Furthermore, the adhesive affinity layer is a structural layer made of maleic anhydride-grafted polyethylene.

[0017] (III) Beneficial Effects

[0018] Compared with the prior art, the present invention provides a UV-protective film with the following advantages:

[0019] This invention features an outermost layer of polytetrafluoroethylene and nano-silica composite material, which is stain-resistant and wear-resistant, protecting the internal structure. The UV-protective layer effectively blocks ultraviolet rays, preventing the aging of items. The gas barrier layer prevents the penetration of gases such as oxygen, extending the shelf life of food and other products. The conductive and thermally conductive layer enables electrical and thermal conductivity, meeting the needs of electronic devices. The adhesive affinity layer firmly bonds other materials. This multi-layer synergy allows the film to integrate multiple functions, solving the problem of insufficient comprehensive performance of traditional films and expanding the application range. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0021] Figure 2 This is a side-section diagram of the connection structure of this utility model.

[0022] In the diagram: 1. Outermost layer; 2. UV protection layer; 3. Gas barrier layer; 4. Conductive and thermally conductive layer; 5. Adhesive and affinity layer. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Example

[0025] like Figure 1-2 As shown, an embodiment of the present invention provides an anti-ultraviolet film, comprising an outermost layer 1;

[0026] It is made of polytetrafluoroethylene (PTFE) and nano-silica. PTFE has an extremely low coefficient of surface friction, giving the film excellent anti-fouling properties, making it difficult for dust, oil, and other contaminants to adhere to its surface; nano-silica enhances the film's wear resistance, improving its durability in daily use, effectively resisting scratches and abrasion, and protecting the internal functional layers.

[0027] The outermost layer 1 has an inner UV-protective layer 2, which is composed of polyester with added hindered amine light stabilizers. Hindered amine light stabilizers can capture free radicals induced by ultraviolet radiation, preventing the polyester molecular chains from undergoing degradation reactions under ultraviolet light. They efficiently absorb and convert ultraviolet radiation, providing excellent UV protection for the film and preventing damage to the film's internal structure and the covered object. For example, they prevent food spoilage due to ultraviolet radiation and prevent the aging of internal components in electronic devices due to ultraviolet radiation.

[0028] A gas barrier layer 3 is provided on the inner side of the UV-protective layer 2; it is made of ethylene-vinyl alcohol copolymer. Ethylene-vinyl alcohol copolymer has a highly dense molecular structure and excellent barrier properties against gases such as oxygen and carbon dioxide. In the food packaging field, it can effectively prevent oxygen from entering the packaging, prevent food oxidation and spoilage, and extend the shelf life of food; in electronic device packaging, it can prevent humid air from entering and protect electronic components from moisture damage.

[0029] A conductive and thermally conductive layer 4 is disposed on the inner side of the gas barrier layer 3; the conductive and thermally conductive layer 4 is composed of polyimide filled with graphene. Graphene has excellent electrical and thermal conductivity, and when filled into polyimide, this layer possesses good electrical and thermal conductivity. In electronic device applications, it can quickly conduct charges, acting as electromagnetic shielding to prevent electronic devices from being affected by external electromagnetic interference; at the same time, it can also efficiently dissipate heat, ensuring that electronic components operate within a suitable temperature range, thereby improving the stability and reliability of electronic devices.

[0030] An adhesive affinity layer 5 is provided on the inner side of the conductive and thermally conductive layer 4;

[0031] It is made from maleic anhydride-grafted polyethylene. The polar groups in the molecular structure of maleic anhydride-grafted polyethylene give it good affinity for a variety of materials, enabling it to form strong adhesion to the surface of the materials being bonded. This ensures that the film is firmly bonded to other materials, guaranteeing the film's adhesion stability even in harsh environments such as high temperature and high humidity, or on surfaces with different properties. This expands the film's application range, playing an important role in fields with high adhesion requirements, such as medical packaging and precision instrument packaging.

[0032] When this UV-protective film is in operation, the outermost layer 1, a composite material of polytetrafluoroethylene (PTFE) and nano-silica, utilizes the low surface energy of PTFE and the reinforcing effect of nano-silica to achieve anti-fouling and wear-resistant effects. The UV-protective layer 2, a polyester with hindered amine light stabilizers, effectively absorbs and converts UV-induced free radicals by capturing the hindered amine light stabilizers, preventing UV penetration. The gas barrier layer 3, an ethylene-vinyl alcohol copolymer, with its unique molecular structure, tightly blocks the passage of gases such as oxygen and carbon dioxide. The conductive and thermally conductive layer 4, filled with graphene, imparts excellent electrical and thermal conductivity to polyimide, enabling charge conduction and heat dissipation. The adhesive affinity layer 5, made from maleic anhydride-grafted polyethylene, forms a strong bond with the surface of the bonded material due to its unique chemical structure, ensuring the film firmly adheres to other materials. All layers work synergistically to perform functions such as UV protection, gas barrier, electrical and thermal conductivity, and adhesive affinity.

[0033] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A UV-protective film, comprising an outermost layer (1), characterized in that: The outermost layer (1) is a structural layer made of polytetrafluoroethylene and nano-silica. An ultraviolet-proof layer (2) is provided on the inner side of the outermost layer (1). A gas barrier layer (3) is provided on the inner side of the ultraviolet-proof layer (2). A conductive and thermally conductive layer (4) is provided on the inner side of the gas barrier layer (3). An adhesive affinity layer (5) is provided on the inner side of the conductive and thermally conductive layer (4).

2. The UV-protective film according to claim 1, characterized in that: The UV protection layer (2) is a composite structure layer made of polyester with added hindered amine light stabilizer.

3. The UV-protective film according to claim 1, characterized in that: The gas barrier layer (3) is a structural layer composed of ethylene-vinyl alcohol copolymer.

4. The UV-protective film according to claim 1, characterized in that: The conductive and thermally conductive layer (4) is a structural layer made of polyimide filled with graphene.

5. The UV-protective film according to claim 1, characterized in that: The adhesive affinity layer (5) is a structure made of maleic anhydride-grafted polyethylene.

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