Super-hydrophobic antibacterial window film for automobile sunroof

Abstract

The utility model discloses a super-hydrophobic bacteriostatic window film for an automobile skylight, and belongs to the technical field of protective films. The technical problem that an existing window film is poor in hydrophobic performance and antibacterial performance is solved. According to the technical scheme, the window film is sequentially composed of a polyurethane elastomer porous film, a heat insulation acrylic acid adhesive layer, a transparent polyurethane elastomer film and an ultraviolet-proof acrylic acid adhesive layer, and all the layers are compounded into a whole. Micropores are formed in the surface and the interior of the polyurethane elastomer porous membrane, hydrophobic nano silicon dioxide is attached to one side of the polyurethane elastomer porous membrane to form a super-hydrophobic layer, and a bacteriostatic agent is attached to the other side of the polyurethane elastomer porous membrane and the interiors of the micropores to form a bacteriostatic layer. The super-hydrophobic polyurethane elastomer porous membrane has the beneficial effects that the hydrophobic nano silicon dioxide and the inorganic bacteriostatic agent are respectively loaded on the two surfaces of the polyurethane elastomer porous membrane, so that the surface of the polyurethane elastomer porous membrane has super-hydrophobicity, and the problem that the bacteriostatic timeliness of the inorganic bacteriostatic agent is not lasting can be solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of protective films, and in particular relates to a super-hydrophobic and antibacterial window film for automobile sunroofs. Background Art

[0002] A car sunroof provides drivers and passengers with an intimate window into nature, while a large panoramic sunroof offers a wider field of view, further enhancing the driving pleasure and riding experience. Because of its location on the roof, dew and rain easily accumulate, forming water spots and rain stains. Once these surface-like foreign matter adheres to the sunroof surface, it is more noticeable to the driver and passengers, affecting the aesthetics and requiring scrubbing to remove.

[0003] Currently, a layer of window film is applied to the skylight glass, and a hydrophobic layer is provided on the outer layer of the window film to prevent dew and rain from staying. In addition, the window film also has functions such as heat insulation, explosion protection, and UV protection through the composite layer structure of the multi-layer film. For example, CN219058868U discloses a color-changing window film for the skylight, which includes a repair layer, a first UV-isolating base film layer, a color-changing layer, a second base film layer, an installation layer, and a release film layer stacked in sequence. The repair layer contains a hydrophobic material that prevents moisture from entering or staying on the window film for a long time. The hydrophobic layer is formed by adding a hydrophobic material to an ordinary coating and coating it on the surface of the window film and curing it. However, over time, it migrates to the coating surface, causing the hydrophobic performance to deteriorate.

[0004] In addition, most panoramic sunroofs are outward-opening structures, which place the opened front window above the rear window. At the same time, some pollutants are distributed in the external atmospheric environment. These pollutants are deposited on the sunroof and breed bacteria. The interior of the open glass will inevitably be contaminated, thereby affecting the environment inside the car. Utility Model Content

[0005] In response to the technical problems of poor hydrophobicity and antibacterial properties of existing window films, the purpose of this utility model is to provide a super-hydrophobic and antibacterial window film for automobile sunroofs. By loading hydrophobic nano-silica and inorganic antibacterial agents on both sides of the polyurethane elastomer porous membrane, the surface of the polyurethane elastomer porous membrane has super-hydrophobicity, and the problem of the short-lasting antibacterial effect of the inorganic antibacterial agent can be improved.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a super-hydrophobic and antibacterial window film for a car sunroof, which is composed of a polyurethane elastomer porous membrane, a heat-insulating acrylic adhesive layer, a transparent polyurethane elastomer membrane, and an anti-ultraviolet acrylic adhesive layer in sequence, and each layer is composited into one; the surface and interior of the polyurethane elastomer porous membrane have micropores, and the side of the polyurethane elastomer porous membrane away from the heat-insulating acrylic adhesive layer is adhered with hydrophobic nano-silica to form a super-hydrophobic layer, and the side of the polyurethane elastomer porous membrane close to the heat-insulating acrylic adhesive layer and the interior of the micropores are adhered with an antibacterial agent to form an antibacterial layer.

[0007] Furthermore, the pore size of the micropores ranges from 5 μm to 60 μm.

[0008] Furthermore, the antibacterial agent is an inorganic antibacterial agent.

[0009] Furthermore, the inorganic antibacterial agent is nano-metal particles or inorganic compounds containing metal ions.

[0010] Furthermore, the metal ions are silver, copper or zinc; and the nano metal particles are nano silver, nano gold or nano copper.

[0011] Furthermore, the thickness of the heat-insulating acrylic adhesive layer is 10 μm to 50 μm.

[0012] Furthermore, the transparent polyurethane elastomer film has a thickness of 50 μm to 175 μm.

[0013] Furthermore, the thickness of the UV-resistant acrylic adhesive layer is 6 μm to 25 μm.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] The window film of the utility model comprises a polyurethane elastomer porous membrane, a heat-insulating acrylic adhesive layer, a transparent polyurethane elastomer membrane and an anti-UV acrylic adhesive layer in sequence. Hydrophobic nano-silica is attached to the outer surface of the polyurethane elastomer porous membrane to form a super-hydrophobic layer with high surface energy on the outer surface of the membrane. Sliding water droplets can carry away dust left on the surface. At the same time, the super-hydrophobic layer can also reduce bacterial adhesion. An inorganic antibacterial agent is attached to the inner surface and inside the micropores of the polyurethane elastomer porous membrane, while the hydrophobic nano-silica is attached to the outer surface of the polyurethane elastomer porous membrane. This can improve the problem of the inorganic antibacterial agent having a short-lasting antibacterial effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural diagram of the utility model;

[0017] Among them, 1 is a polyurethane elastomer porous membrane, 2 is a heat-insulating acrylic adhesive layer, 3 is a transparent polyurethane elastomer membrane, 4 is an anti-UV acrylic adhesive layer, 11 is a super-hydrophobic layer, and 12 is an antibacterial layer. DETAILED DESCRIPTION

[0018] In order to clearly, accurately and completely express the technical mode implemented by the present invention, the present invention will be further described below with reference to embodiments and drawings.

[0019] The utility model provides a super hydrophobic antibacterial window film, such as Figure 1 As shown, it comprises a polyurethane elastomer porous membrane 1, a heat-insulating acrylic adhesive layer 2, a transparent polyurethane elastomer membrane 3, and an anti-ultraviolet acrylic adhesive layer 4 in sequence. The polyurethane elastomer porous membrane is a thin film with micropores, which has a porous structure on the surface and inside. The micropores are used to release antibacterial agents, and when water vapor is formed inside the membrane, it can diffuse to the outside through the micropores. Hydrophobic nano-silica is attached to one side of the polyurethane elastomer porous membrane 1 to form a super-hydrophobic layer 11. The appearance of the hydrophobic nano-silica is an amorphous white powdery solid with a large specific surface area. The hydrophobic nano-silica can be attached to the side of the polyurethane elastomer porous membrane away from the heat-insulating acrylic adhesive layer by spraying, that is, the hydrophobic nano-silica is attached to the outer surface of the polyurethane elastomer porous membrane to form a micro-nano structure, which reduces the surface energy and has a special wettability characteristic similar to that of a lotus leaf, thereby improving the hydrophobic effect. Compared with the polyurethane elastomer porous membrane, the water contact angle of the polyurethane elastomer porous membrane loaded with hydrophobic nano-silica can reach 151.9°, meeting the superhydrophobic standard.

[0020] An antibacterial agent is attached to one side of the polyurethane elastomer porous membrane near the insulating acrylic adhesive layer and inside the micropores to form an antibacterial layer 12. Specifically, the antibacterial agent is attached to the inner surface of the polyurethane elastomer porous membrane and inside the micropores. The antibacterial agent is an inorganic antibacterial agent, which is nanometal particles or an inorganic compound containing metal ions, wherein the metal ions are silver, copper, or zinc; the nanometal particles are nanosilver, nanogold, or nanocopper. When the inorganic antibacterial agent is added to the coating before being applied to the outer surface of the membrane, poor bonding between the inorganic antibacterial agent and the coating can easily lead to loss of the inorganic antibacterial agent, thereby reducing the antibacterial ability. The inorganic antibacterial agent of the utility model is attached to the inner surface and micropores of the polyurethane elastomer porous membrane. The inorganic antibacterial agent is sprayed on the inner surface of the polyurethane elastomer porous membrane and pressed into the micropores of the polyurethane elastomer porous membrane. Moreover, over time, the inorganic antibacterial agent can migrate through the micropores to the outer surface of the polyurethane elastomer porous membrane, thereby releasing the inorganic antibacterial agent. The hydrophobic nano-silica is wrapped around the outside of the inorganic antibacterial agent, controlling the release rate of the inorganic antibacterial agent and extending the antibacterial time of the inorganic antibacterial agent. The micropores of the polyurethane elastomer porous membrane after super-hydrophobic and antibacterial treatment are less than 100nm, and can pass 25nm of antibacterial agent while blocking bacteria of 0.5 to 5μm.

[0021] The transparent polyurethane elastomer film has good stretchability, allowing the window film to be better adhered to the skylight glass. At the same time, it has good light transmittance and meets the lighting requirements. A heat-insulating acrylic adhesive layer and an anti-UV acrylic adhesive layer are respectively provided on both sides of the transparent polyurethane elastomer film, which can make the window film have good radiation reduction, heat insulation and UV blocking effects. Nano-tin antimony oxide is added to the acrylic adhesive and coated on the transparent polyurethane elastomer film to obtain a heat-insulating acrylic adhesive layer, which can effectively block infrared rays and achieve the effect of heat insulation and energy saving. By adding a UV absorber to the acrylic adhesive and coating it on the release film, the anti-UV acrylic adhesive layer is formed on the transparent polyurethane elastomer film, which can effectively block ultraviolet rays with a UV blocking rate of >99%. The release film can better protect the anti-UV acrylic adhesive layer before use and is easy to peel off during use.

[0022] Example 1

[0023] The super hydrophobic antibacterial window film for automobile sunroof of this embodiment is as follows Figure 1 As shown, it is composed of a polyurethane elastomer porous membrane 1, a heat-insulating acrylic adhesive layer 2, a transparent polyurethane elastomer membrane 3, and an anti-ultraviolet acrylic adhesive layer 4 in sequence, and each layer is composited into one.

[0024] The polyurethane elastomer porous membrane 1 has micropores on its surface and interior, with a pore size range of 5 to 10 μm. Hydrophobic nano-silica is attached to the outer surface of the polyurethane elastomer porous membrane 1 to form a super-hydrophobic layer 11, with a mass fraction of hydrophobic nano-silica of 5%. An antibacterial agent, nano-silver particles, is attached to the inner surface of the polyurethane elastomer porous membrane 1 and the interior of the micropores to form an antibacterial layer 12.

[0025] The thickness of the heat-insulating acrylic adhesive layer 2 is 7 to 8 μm, the thickness of the transparent polyurethane elastomer film 3 is 125 μm, and the thickness of the UV-proof acrylic adhesive layer 4 is 7 to 8 μm.

Claims

1. A super hydrophobic antibacterial window film for a car sunroof, characterized in that: The invention is sequentially composed of a polyurethane elastomer porous membrane (1), a heat-insulating acrylic adhesive layer (2), a transparent polyurethane elastomer membrane (3), and an anti-ultraviolet acrylic adhesive layer (4), and the layers are composited into one body; the surface and interior of the polyurethane elastomer porous membrane (1) are provided with micropores; a hydrophobic nano-silica is attached to a side of the polyurethane elastomer porous membrane (1) away from the heat-insulating acrylic adhesive layer (2) to form a super-hydrophobic layer (11); and an antibacterial agent is attached to a side of the polyurethane elastomer porous membrane (1) close to the heat-insulating acrylic adhesive layer (2) and the interior of the micropores to form an antibacterial layer (12).

2. The super-hydrophobic antibacterial window film for automobile sunroof according to claim 1, characterized in that: The pore diameter of the micropores ranges from 5 μm to 60 μm.

3. The super hydrophobic antibacterial window film for automobile sunroof according to claim 1, characterized in that: The bacteriostatic agent is an inorganic bacteriostatic agent.

4. The super-hydrophobic antibacterial window film for automobile sunroof according to claim 3, characterized in that: The inorganic antibacterial agent is nano metal particles or inorganic compounds containing metal ions.

5. The super-hydrophobic antibacterial window film for automobile sunroof according to claim 4, characterized in that: The metal ions are silver, copper or zinc; the nano metal particles are nano silver, nano gold or nano copper.

6. The super-hydrophobic antibacterial window film for automobile sunroof according to claim 1, characterized in that: The thickness of the heat-insulating acrylic adhesive layer (2) is 10 μm to 50 μm.

7. The super hydrophobic antibacterial window film for automobile sunroof according to claim 1, characterized in that: The transparent polyurethane elastomer film (3) has a thickness of 50 μm to 175 μm.

8. The super hydrophobic antibacterial window film for automobile sunroof according to claim 1, characterized in that: The thickness of the anti-ultraviolet acrylic adhesive layer (4) is 6 μm to 25 μm.

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