PVC decorative film with self-cleaning and antibacterial functions, and preparation process and application thereof

Abstract

The application belongs to the technical field of decorative films, and particularly relates to PVC decorative film with self-cleaning and antibacterial functions, and a preparation process and application thereof. The PVC decorative film with self-cleaning and antibacterial functions comprises, from top to bottom, a functional coating, a PVC surface film and a PVC bottom film. The preparation method of the functional coating is as follows: a isocyanate-silane treated composite filler, a diol hydroxyl single-terminated long-chain alkyl silicone oil, stannous octoate and toluene are mixed, heated and stirred to react, toluene is removed by rotary evaporation after the reaction is completed, and then added into an ethanol aqueous solution, and then mixed with methyltrimethoxysilane, tetraethyl orthosilicate, a silicone quaternary ammonium salt and a sulfobetaine-silane copolymer, and hydrochloric acid solution is added dropwise, stirred, and then the functional coating is obtained after stirring is completed. The functional coating is coated on the PVC surface film, and then solidified to obtain the PVC decorative film. The PVC decorative film provided by the application has the characteristics of persistent self-cleaning, antibacterial, mildewproof and scratch-resistant.

Description

Technical Field

[0001] This invention belongs to the field of decorative film technology, specifically relating to a PVC decorative film with self-cleaning and antibacterial functions, its preparation process, and its application. Background Technology

[0002] PVC decorative film is a surface decoration material with advantages such as light weight, bright colors, strong decorative effect, simple construction and convenient installation. It is widely used in furniture surface decoration, interior wall decoration, floor decoration and other fields.

[0003] While PVC decorative films currently on the market can meet certain needs in terms of aesthetics and basic protection, they still have many shortcomings in actual use: First, the surface of PVC decorative films has poor stain resistance, especially in high-frequency contact situations (cabinets, countertops), where they are easily contaminated with fingerprints, oil stains, liquids, and other pollutants; Second, after prolonged use, the surface of PVC decorative films is prone to mold and bacterial growth, especially in humid and poorly ventilated environments; Third, PVC decorative films are easily scratched when subjected to impacts from sharp objects.

[0004] To address the aforementioned issues, Chinese Patent CN120118368B discloses a high-toughness, stain-resistant, and mildew-resistant decorative film, comprising a polyvinyl chloride (PVC) film and a stain-resistant coating. The PVC film is composed of the following components in parts by weight: 77-89 parts PVC resin, 21-29 parts chlorinated polyethylene resin, 4-12 parts toughening and mildew-resistant agent, and 4-8 parts additives. The stain-resistant coating is prepared through the following steps: hydrophobic silica is added to anhydrous ethanol and ultrasonically dispersed for 15-30 minutes. Then, it is mixed with methyltrimethoxysilane, tridecafluorooctyltriethoxysilane, and tetraethyl orthosilicate, stirred until homogeneous, and then hydrochloric acid solution is slowly added dropwise while continuously stirring to promote the hydrolysis reaction of the siloxanes. After stirring for 2-3 hours, stirring is stopped to obtain the stain-resistant coating. However, fluorosilanes are prone to migration and desorption in humid and hot environments, leading to a decrease in their stain resistance. Furthermore, this technical solution only focuses on mildew resistance and neglects antibacterial properties.

[0005] Chinese Patent Publication No. CN118895012A discloses an antibacterial PVC decorative film and its preparation method. The antibacterial PVC decorative film includes a PVC base film and a wear-resistant antibacterial layer on the surface of the PVC base film. The PVC base film contains a silicon-oxygen nanostructure framework material, which is a POSS-based siloxane. The mass ratio of the wear-resistant antibacterial layer is: 30-40 parts of PVC resin, 10-15 parts of nano titanium dioxide, 0.3-0.5 parts of heat stabilizer, 3-5 parts of wear-resistant agent, 1-2 parts of dispersant, 0.3-0.5 parts of antioxidant, 3-4 parts of antibacterial agent, and 4-7 parts of plasticizer. In this wear-resistant antibacterial layer, nano titanium dioxide and chitosan are used as antibacterial materials, but the inhibitory effect on mold is not good. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of the prior art and provide a PVC decorative film with self-cleaning and antibacterial functions, its preparation process, and its application.

[0007] To achieve the above objectives, the present invention provides the following technical solution: The first aspect of the present invention provides a PVC decorative film with self-cleaning and antibacterial functions, which includes, from top to bottom, a functional coating, a PVC surface film and a PVC base film; The preparation method of the functional coating is as follows: isocyanate-based silane-treated composite filler, diol hydroxyl-terminated long-chain alkyl silicone oil, stannous octoate and toluene are mixed, heated and stirred to react, toluene is removed by rotary evaporation after the reaction is completed, added to an ethanol aqueous solution, and then mixed with methyltrimethoxysilane, tetraethyl orthosilicate, organosilicon quaternary ammonium salt and sulfobetaine-silane copolymer, hydrochloric acid solution is added dropwise, and stirred. After stirring is completed, the functional coating is obtained. The functional coating is coated on a PVC film and cured to obtain the final product.

[0008] Currently, to give PVC decorative film good stain resistance, a hydrophobic coating is usually applied to the surface of the PVC film. However, conventional hydrophobic coatings usually use fluorinated silanes to give it good hydrophobicity. Fluorinated silanes are prone to migration and desorption in humid and hot environments, which leads to a decrease in their stain resistance and limits their use in summer, especially in the summer in the south.

[0009] To solve this technical problem, the present invention first treats the composite filler with isocyanate-based silane, then grafts a diol hydroxyl-terminated long-chain alkyl silicone oil, and finally mixes the composite filler with methyltrimethoxysilane, tetraethyl orthosilicate, organosilicon quaternary ammonium salt and sulfobetaine-silane copolymer, and prepares a superhydrophobic coating on the surface of a PVC film using the sol-gel method. This superhydrophobic coating is based on the synergistic effect of micro / nano rough structure and low surface energy modification. Experimental verification shows that it still has excellent superhydrophobicity after being placed in a humid and hot environment for 1 month.

[0010] As a preferred embodiment, the preparation method of the functional coating is as follows: isocyanate-based silane-treated composite filler, diol hydroxyl-terminated long-chain alkyl silicone oil, stannous octoate, and toluene are mixed and heated to 70-80℃ with stirring for 3-5 hours. After the reaction, toluene is removed by rotary evaporation and added to a 10-30% ethanol aqueous solution. Then, it is mixed with methyltrimethoxysilane, tetraethyl orthosilicate, organosilicon quaternary ammonium salt, and sulfobetaine-silane copolymer. Hydrochloric acid solution is added dropwise to adjust the pH to 3-4, and the mixture is stirred at 30-40℃ for 2-3 hours. After stirring, the functional coating is obtained. The functional coating is then coated onto a PVC film and cured to obtain the final product.

[0011] In a preferred embodiment, the composite filler is a mixture of nano zinc oxide, nano cerium dioxide and carbon nanotubes in a mass ratio of 8-12:3-6:1.

[0012] In a preferred embodiment, the nano-zinc oxide has a particle size of 10-30 nm, the nano-cerium dioxide has a particle size of 50-80 nm, and the carbon nanotubes are carbon nanotube powder with a length of 10-20 μm and a specific surface area of ​​150-300 m². 2 / g.

[0013] In the prior art, antibacterial, anti-mildew, and scratch-resistant coatings are applied to the surface of PVC decorative films to impart antibacterial, anti-mildew, and scratch-resistant properties. However, conventional PVC decorative films usually cannot simultaneously possess antibacterial, anti-mildew, scratch-resistant, and stain-resistant properties. To solve this technical problem, this invention optimizes the composition and particle size of composite fillers, and uses composite fillers to construct a micro-nano rough structure to improve hydrophobicity while imparting excellent antibacterial, anti-mildew, and scratch-resistant properties to PVC decorative films.

[0014] In this invention, there are no special requirements for the preparation method of the isocyanate-based silane-treated composite filler; conventional methods in the art can be selected.

[0015] As a preferred embodiment, the method for preparing the isocyanate-based silane-treated composite filler is as follows: the composite filler is dispersed in acetone, isocyanate-based silane is added, the mixture is heated and stirred under reflux, and after the reaction is completed, it is filtered, washed, and dried to obtain the final product.

[0016] In this invention, there are no special requirements for the selection of the isocyanate-based silane; any commonly used isocyanate-based silane in the art can be selected.

[0017] In a preferred embodiment, the isocyanate-based silane coupling agent is selected from at least one of 3-isocyanate-propyltriethoxysilane, 3-isocyanate-propyltrimethoxysilane, and 3-isocyanate-propylmethyldimethoxysilane.

[0018] In a preferred embodiment, the heating, stirring, and reflux temperature is 60-80°C, and the time is 2-5 hours.

[0019] In a preferred embodiment, the mass ratio of the composite filler, acetone, and isocyanate-based silane is 1:10-30:1.5-2.5.

[0020] As a preferred embodiment, the structural formula of the diol hydroxyl-terminated long-chain alkyl silicone oil is as follows: ; Where j, k, and p are each independent integers from 0 to 100; j ≥ 1; k ≥ 1; p ≥ 0.

[0021] The inventors discovered that PVC decorative films prepared using diol hydroxyl-terminated long-chain alkyl silicone oil exhibit superior self-cleaning properties, self-cleaning durability, and scratch resistance compared to dual-terminated hydroxyl-terminated long-chain alkyl silicone oil or dual-terminated hydroxypropyl silicone oil. This may be attributed to the fact that diol hydroxyl-terminated long-chain alkyl silicone oil is fixed at only one end, allowing the siloxane tail chain to extend freely and migrate efficiently to the surface, forming a low surface energy layer. This not only improves the self-cleaning properties and self-cleaning durability of the PVC decorative film but also makes it easier to slip on the PVC surface under external force, thus enhancing scratch resistance.

[0022] The present invention does not have special requirements on the source of the diol hydroxyl-terminated long-chain alkyl silicone oil. It can be prepared according to known methods or commercially available products can be selected. Examples of commercially available products include Silok®8822F4 diol hydroxyl-terminated long-chain alkyl silicone oil from Guangzhou Silok New Material Co., Ltd., and MY 8866 diol hydroxyl-terminated long-chain alkyl silicone oil from Anhui Mingyi Silicon Industry Co., Ltd.

[0023] In a preferred embodiment, the number average molecular weight of the diol hydroxyl-terminated long-chain alkyl silicone oil is 2000-5000 g / mol.

[0024] In a preferred embodiment, the organosilicon quaternary ammonium salt is dimethyloctadecyl[3-trimethoxysilylpropyl]ammonium chloride (CAS No. 27668-52-6).

[0025] In a preferred embodiment, the sulfobetaine-silane copolymer is 3-((dimethyl(3-trimethoxysilyl)propyl)ammonium)-propane-1-sulfonate (CAS No. 151778-80-2).

[0026] The inventors discovered that relying solely on the antibacterial effects of nano-zinc oxide and nano-cerium dioxide in the composite filler would result in insufficient antibacterial and antifungal properties of PVC decorative film, thus limiting its use in humid and hot environments. To solve this problem, this invention introduces organosilicon quaternary ammonium salt and sulfobetaine-silane copolymer. The two work together with the composite filler to endow PVC decorative film with excellent antibacterial and antifungal properties.

[0027] In a preferred embodiment, the mass ratio of the isocyanate-based silane-treated composite filler, the diol hydroxyl-terminated long-chain alkyl silicone oil, the stannous octoate, and the toluene is 2-4:15-20:0.05-0.2:30-50.

[0028] In a preferred embodiment, the mass ratio of the isocyanate-based silane-treated composite filler, methyltrimethoxysilane, tetraethyl orthosilicate, organosilicon quaternary ammonium salt, sulfobetaine-silane copolymer, and ethanol aqueous solution is 2-3:5-8:1-1.5:0.5-1:0.5-1:30-50.

[0029] The present invention does not have any special requirements for the PVC face mask; it may or may not have a printed pattern.

[0030] The present invention does not have any special requirements on the source of the PVC face film and PVC back film. They can be prepared according to known methods or commercially available products can be selected.

[0031] The PVC of this invention does not have special requirements for the thickness of the PVC face film and the PVC base film, and conventional thicknesses in the art can be used.

[0032] In some embodiments of the present invention, the thickness of the PVC mask is 0.05-0.1 mm.

[0033] In some embodiments of the present invention, the thickness of the PVC base film is 0.1-0.4 mm.

[0034] In a preferred embodiment, the thickness of the functional coating is 8-12µm.

[0035] The second aspect of the present invention provides a process for preparing a PVC decorative film with self-cleaning and antibacterial functions, comprising the following steps: on a two-roll laminating and embossing machine, a PVC surface film and a PVC base film that have completed the curing of the functional coating are heated and pressed together to obtain the film.

[0036] The third aspect of this invention provides an application of a PVC decorative film with self-cleaning and antibacterial functions in the fields of furniture surface decoration, interior wall decoration, or floor decoration.

[0037] Compared with the prior art, the advantages and beneficial effects of the present invention are as follows: 1. This invention first treats the composite filler with isocyanate-based silane, then grafts a diol hydroxyl-terminated long-chain alkyl silicone oil, and finally mixes the composite filler with methyltrimethoxysilane, tetraethyl orthosilicate, organosilicon quaternary ammonium salt and sulfobetaine-silane copolymer. A superhydrophobic coating is then prepared on the surface of a PVC film using the sol-gel method. This superhydrophobic coating is based on the synergistic effect of micro / nano rough structure and low surface energy modification. Experimental verification shows that it still has excellent superhydrophobic self-cleaning properties after being placed in a humid and hot environment for 1 month.

[0038] 2. This invention optimizes the composition and particle size of the composite filler, and uses the composite filler to construct a micro-nano rough structure to improve hydrophobicity while giving PVC decorative film excellent antibacterial, mildew-proof and scratch-resistant properties.

[0039] 3. This invention introduces organosilicon quaternary ammonium salt and sulfobetaine-silane copolymer, which work together with composite fillers to give PVC decorative film excellent antibacterial and antifungal properties. Attached Figure Description

[0040] Figure 1 The graph shows the test results for the content of Substances of Very High Concern (SVHCs) in the PVC decorative film of Example 1, based on the list of SVHCs published by the European Chemicals Agency. Detailed Implementation

[0041] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0042] Unless otherwise specified in the examples and comparative examples, the conditions were performed under standard conditions or conditions recommended by the manufacturer. All reagents and instruments used were commercially available products unless otherwise specified.

[0043] Example 1

[0044] A PVC decorative film with self-cleaning and antibacterial functions includes, from top to bottom, a functional coating, a PVC surface film, and a PVC base film; The specific preparation method of the functional coating is as follows: isocyanate-based silane-treated composite filler, diol hydroxyl-terminated long-chain alkyl silicone oil, stannous octoate and toluene are mixed, heated to 80°C and stirred for 4 hours. After the reaction is completed, toluene is removed by rotary evaporation, and the mixture is added to a 20% ethanol aqueous solution. Then, it is mixed with methyltrimethoxysilane, tetraethyl orthosilicate, organosilicon quaternary ammonium salt and sulfobetaine-silane copolymer. Hydrochloric acid solution is added dropwise to adjust the pH to 3.5, and the mixture is stirred at 35°C for 3 hours. After stirring, the functional coating is obtained. The functional coating is coated on a PVC film and cured at 80°C for 3 hours to obtain the final product.

[0045] The composite filler is a mixture of nano zinc oxide, nano cerium dioxide and carbon nanotubes in a mass ratio of 10:5:1.

[0046] The nano zinc oxide has a particle size of 30 nm, the nano cerium dioxide has a particle size of 60 nm, and the carbon nanotubes are carbon nanotube powder with a length of 12.5 ± 2.5 μm and a specific surface area of ​​200 ± 50 m² / g.

[0047] The method for preparing the isocyanate-based silane-treated composite filler is as follows: the composite filler is dispersed in acetone, 3-isocyanate-based propyltriethoxysilane is added, and the mixture is heated and stirred under reflux at 70°C for 3 hours. After the reaction is completed, the mixture is filtered, washed, and dried to obtain the final product.

[0048] The mass ratio of the composite filler, acetone, and isocyanate-based silane is 1:20:2.

[0049] The diol hydroxyl-terminated long-chain alkyl silicone oil is MY 8866, manufactured by Anhui Mingyi Silicon Industry Co., Ltd., with a number average molecular weight of 4250 g / mol and a hydroxyl content of 0.8%.

[0050] The organosilicon quaternary ammonium salt is dimethyloctadecyl[3-trimethoxysilylpropyl]ammonium chloride (CAS No. 27668-52-6).

[0051] The sulfobetaine-silane copolymer is 3-((dimethyl(3-trimethoxysilyl)propyl)ammonium)-propane-1-sulfonate (CAS No. 151778-80-2).

[0052] The mass ratio of the isocyanate-based silane-treated composite filler, the diol hydroxyl-terminated long-chain alkyl silicone oil, the stannous octoate, and the toluene is 3:18:0.1:30.

[0053] The mass ratio of the isocyanate-based silane-treated composite filler, methyltrimethoxysilane, tetraethyl orthosilicate, organosilicon quaternary ammonium salt, sulfobetaine-silane copolymer, and ethanol aqueous solution is 2.5:6:1.2:0.6:0.6:50.

[0054] The thickness of the PVC mask is 0.05 mm.

[0055] The thickness of the PVC base film is 0.2 mm.

[0056] The thickness of the functional coating is 10µm.

[0057] The preparation process of the above-mentioned PVC decorative film with self-cleaning and antibacterial functions includes the following steps: on a double-roll laminating and embossing machine, the PVC surface film and PVC base film that have completed the curing of functional coatings are heated and pressed together to obtain the final product.

[0058] Example 2

[0059] The only difference from Example 1 is that the composite filler is a mixture of nano zinc oxide, nano cerium dioxide and carbon nanotubes in a mass ratio of 9:6:1.

[0060] The nano-zinc oxide has a particle size of 20 nm, the nano-cerium dioxide has a particle size of 50 nm, and the carbon nanotubes are carbon nanotube powder with a length of 15 ± 5 μm and a specific surface area of ​​175 ± 25 m². 2 / g; all others are the same.

[0061] Comparative Example 1 The only difference from Example 1 is that the composite filler is a mixture of nano zinc oxide, nano cerium dioxide and carbon nanotubes in a mass ratio of 6:9:1.

[0062] The nano-zinc oxide has a particle size of 30 nm, the nano-cerium dioxide has a particle size of 100 nm, and the carbon nanotubes are carbon nanotube powder with a length of 12.5 ± 2.5 μm and a specific surface area of ​​200 ± 50 m². 2 / g; all others are the same.

[0063] Comparative Example 2 The only difference from Example 1 is that the composite filler is a mixture of nano zinc oxide, nano cerium dioxide and carbon nanotubes in a mass ratio of 13:2:1.

[0064] The nano-zinc oxide has a particle size of 50 nm, the nano-cerium dioxide has a particle size of 80 nm, and the carbon nanotubes are carbon nanotube powder with a length of 12.5 ± 2.5 μm and a specific surface area of ​​200 ± 50 m². 2 / g; all others are the same.

[0065] Comparative Example 3 The only difference from Example 1 is that the composite filler is a mixture of nano zinc oxide, nano cerium dioxide and nano silica with a mass ratio of 10:5:1; all other aspects are the same.

[0066] Comparative Example 4 The only difference from Example 1 is that the composite filler is a mixture of nano zinc oxide, nano titanium dioxide with a particle size of 60 nm and carbon nanotubes in a mass ratio of 10:5:1; all other aspects are the same.

[0067] Comparative Example 5 The only difference from Example 1 is that the diol hydroxyl-terminated long-chain alkyl silicone oil was replaced with an equal mass of MY 8865H diol hydroxyl-terminated long-chain alkyl silicone oil from Anhui Mingyi Silicon Industry Co., Ltd., with a number average molecular weight of 4000 g / mol and a hydroxyl content of 0.8%; all other aspects are the same.

[0068] Comparative Example 6 The only difference from Example 1 is that the diol hydroxyl-terminated long-chain alkyl silicone oil was replaced with an equal mass of Anhui Mingyi Silicon Industry Co., Ltd.'s MY2030 dual-terminated hydroxypropyl silicone oil, with a number average molecular weight of 4300 g / mol and a hydroxyl content of 0.8%; all other aspects are the same.

[0069] Comparative Example 7 The only difference from Example 1 is that the organosilicon quaternary ammonium salt is replaced with an equal mass of sulfobetaine-silane copolymer; all other aspects are the same.

[0070] Comparative Example 8 The only difference from Example 1 is that the sulfobetaine-silane copolymer is replaced with an equal mass of organosilicon quaternary ammonium salt; all other aspects are the same.

[0071] Performance Test 1: 1. Self-cleaning property: The water contact angle of the PVC decorative films prepared in the above examples and comparative examples was tested; 2. Self-cleaning durability: The sample was placed in a humid and hot environment (40℃, 95% relative humidity) for 30 days, and the self-cleaning durability was tested using the same method as for self-cleaning. 3. Antibacterial properties: The antibacterial properties of Staphylococcus aureus and Escherichia coli were tested according to GB / T 31402-2023 "Determination of antibacterial activity of plastics and other non-porous materials". 4. Anti-mildew properties: Tested according to GB / T 24128-2018 "Evaluation of the anti-mildew effect of plastic anti-mildew agents", the microorganism was Aspergillus niger; 5. Scratch resistance: The surface scratch resistance was tested according to GB / T 17657-2022 "Test Methods for Physical and Chemical Properties of Wood-based Panels and Decorative Wood-based Panels" 4.42. The load was recorded when the surface had ≥90% continuous double-ring clearly visible scratches.

[0072] Table 1

[0073] As shown in Table 1, the water contact angle of the PVC decorative film in Examples 1-2 is greater than 150° before and after placement in a humid and hot environment, exhibiting excellent and durable hydrophobic self-cleaning properties; the antibacterial rate against Staphylococcus aureus and Escherichia coli is greater than 99.9%, and the mildew resistance is grade 0, demonstrating excellent antibacterial and mildew-resistant properties; the scratch resistance load is greater than 1.5N, exhibiting excellent scratch resistance.

[0074] Compared with Example 1: The changes in the ratio and particle size of the composite fillers in Comparative Examples 1-2 resulted in a significant decrease in the water contact angle of the PVC decorative film before and after placement in a humid and hot environment, indicating a decrease in self-cleaning effect. The scratch resistance of Comparative Example 2 also decreased significantly. Although the changes in the composition of the composite filler in Comparative Examples 3 and 4 improved the scratch resistance, the water contact angle of the PVC decorative film obtained in Comparative Example 3 decreased significantly before and after being placed in a humid and hot environment, indicating a decrease in self-cleaning effect; the antibacterial properties of the PVC decorative film obtained in Comparative Example 4 decreased significantly. When the diol hydroxyl-terminated long-chain alkyl silicone oil in Comparative Examples 5-6 was replaced, the water contact angle of the resulting PVC decorative film decreased significantly both before and after placement in a humid and hot environment, indicating a decrease in self-cleaning effect; the antibacterial properties of the PVC decorative film obtained in Comparative Example 4 decreased significantly; at the same time, its scratch resistance also decreased significantly. Comparative Examples 7-8 contained only sulfobetaine-silane copolymers or organosilicon quaternary ammonium salts, resulting in decreased antibacterial and antifungal properties of the PVC decorative films.

[0075] Performance Test 2: The PVC decorative film of Example 1 was tested for the content of Substances of Very High Concern (SVHCs) according to the list of Substances of Very High Concern (SVHCs) published by the European Chemicals Agency. The results are as follows: Figure 1 As shown.

[0076] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A PVC decorative film with self-cleaning and antibacterial functions, characterized in that, From top to bottom, it includes a functional coating, a PVC face film, and a PVC base film; The preparation method of the functional coating is as follows: isocyanate-based silane-treated composite filler, diol hydroxyl-terminated long-chain alkyl silicone oil, stannous octoate and toluene are mixed, heated and stirred to react, toluene is removed by rotary evaporation after the reaction is completed, added to an ethanol aqueous solution, and then mixed with methyltrimethoxysilane, tetraethyl orthosilicate, organosilicon quaternary ammonium salt and sulfobetaine-silane copolymer, hydrochloric acid solution is added dropwise, and stirred. After stirring is completed, the functional coating is obtained. The functional coating is coated on a PVC film and cured to obtain the final product.

2. The PVC decorative film with self-cleaning and antibacterial functions according to claim 1, characterized in that, The composite filler is a mixture of nano zinc oxide, nano cerium dioxide and carbon nanotubes in a mass ratio of 8-12:3-6:

1.

3. The PVC decorative film with self-cleaning and antibacterial functions according to claim 2, characterized in that, The nano-zinc oxide has a particle size of 10-30 nm, the nano-cerium dioxide has a particle size of 50-80 nm, and the carbon nanotubes are carbon nanotube powder with a length of 10-20 μm and a specific surface area of ​​150-300 m². 2 / g.

4. The PVC decorative film with self-cleaning and antibacterial functions according to any one of claims 1-3, characterized in that, The structural formula of the diol hydroxyl-terminated long-chain alkyl silicone oil is as follows: ； Where j, k, and p are each independent integers from 0 to 100; j ≥ 1; k ≥ 1; p ≥ 0.

5. The PVC decorative film with self-cleaning and antibacterial functions according to claim 4, characterized in that, The number average molecular weight of the diol hydroxyl-terminated long-chain alkyl silicone oil is 2000-5000 g / mol.

6. The PVC decorative film with self-cleaning and antibacterial functions according to claim 4 or 5, characterized in that, The organosilicon quaternary ammonium salt is dimethyloctadecyl[3-trimethoxysilylpropyl]ammonium chloride.

7. The PVC decorative film with self-cleaning and antibacterial functions according to claim 6, characterized in that, The sulfobetaine-silane copolymer is 3-((dimethyl(3-trimethoxysilyl)propyl)ammonium)-propane-1-sulfonate.

8. The PVC decorative film with self-cleaning and antibacterial functions according to claim 7, characterized in that, The mass ratio of the isocyanate-based silane-treated composite filler, methyltrimethoxysilane, tetraethyl orthosilicate, organosilicon quaternary ammonium salt, sulfobetaine-silane copolymer, and ethanol aqueous solution is 2-3:5-8:1-1.5:0.5-1:0.5-1:30-50.

9. The preparation process of the PVC decorative film with self-cleaning and antibacterial functions according to any one of claims 1-8, characterized in that, Includes the following steps: On a two-roll lamination and embossing machine, the PVC face film and PVC base film, which have already undergone functional coating curing, are heated and pressed together to obtain the final product.

10. The application of the PVC decorative film with self-cleaning and antibacterial functions as described in any one of claims 1-8 in the fields of furniture surface decoration, interior wall decoration or floor decoration.

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