Photocatalytic antibacterial coating product

Abstract

The utility model discloses a photocatalytic antibacterial coating product which comprises a coating base layer and a photocatalytic heterojunction antibacterial functional layer, and the coating base layer is used for being attached to a wall surface; the photocatalytic heterojunction antibacterial functional layer is fixed on the surface of the coating base layer. The photocatalytic antibacterial coating product disclosed by the utility model can be used for decorating and protecting a wall surface and has an efficient sterilization effect.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of paint, specifically, a kind of photocatalytic antibacterial paint product. BACKGROUND

[0002] In many fields such as building decoration and industrial protection, paint plays a crucial role. Traditional solvent-based paint has dominated the market due to its good film-forming properties, hardness and gloss. However, solvent-based paint contains a large amount of volatile organic compounds (VOC), which can be released into the air during production, application and use, causing serious environmental pollution and great harm to human health. Water-based paint uses water as the solvent or dispersion medium, greatly reducing VOC emissions, and has the advantages of environmental protection and safety, so it has gradually become the mainstream direction of the paint industry. Among them, water-based acrylic paint has good weather resistance, water resistance, adhesion and flexibility, and relatively low cost, accounting for an important share in the water-based paint market. It is widely used in interior and exterior wall decoration, wood coating, metal protection and other fields.

[0003] In fact, many application sites have high requirements for the antibacterial performance of paint. For example, hospitals, schools, food processing plants and other places are densely populated and prone to bacterial and viral growth. Although existing water-based acrylic paint can meet the decoration and protection needs to some extent, its antibacterial function is limited. In recent years, photocatalytic antibacterial technology has attracted widespread attention due to its high efficiency and environmental protection. Among many photocatalytic materials, semiconductor materials are very common. Semiconductor materials can generate active groups under light conditions, which can effectively kill bacteria and decompose organic matter. Titanium dioxide (TiO2) is one of the common semiconductor materials, which has the advantages of high efficiency and good photochemical stability, and has great development potential in the field of photocatalysts. When titanium dioxide is irradiated by light of a specific wavelength, the internal electrons will jump from the valence band (VB) to the conduction band (CB), and at the same time, the valence band will leave a hole, thus forming an electron / hole pair (e - / h + ). These electrons and holes can react with water, oxygen and other substances on the surface of titanium dioxide, generating active groups. The generated active groups have strong bactericidal ability and can attack the cell wall, cell membrane, protein and nucleic acid of bacteria and other biological macromolecules.

[0004] However, the use of pure titanium dioxide nanoparticles has the problems of poor dispersibility and low photocatalytic efficiency. The low efficiency of charge mobility of the electron / hole pair leads to a rapid recombination rate, and the characteristics of wide band gap and narrow absorption range limit the high performance of titanium dioxide (TiO2).

[0005] Currently, the antibacterial properties of coating products still need to be improved. Utility Model Content

[0006] The present invention aims to at least solve one of the technical problems existing in the prior art. Therefore, one objective of the first aspect of the present invention is to provide a photocatalytic antibacterial coating product that can decorate and protect wall surfaces while also having a highly efficient bactericidal effect.

[0007] The photocatalytic antibacterial coating product according to an embodiment of the present invention includes:

[0008] A coating substrate, which is used to adhere to a wall surface;

[0009] A photocatalytic heterojunction antibacterial functional layer is fixed on the surface of the coating substrate.

[0010] The antibacterial principle of the photocatalytic antibacterial coating product of this utility model embodiment is as follows: Due to the presence of a photocatalytic heterojunction in the antibacterial functional layer, for example, a TiO2 / ZnO heterojunction, under light irradiation, electrons in the two materials (such as TiO2 and ZnO) of the photocatalytic heterojunction undergo electron transitions and generate holes respectively. Because the heterojunction formed by the two materials (such as TiO2 and ZnO) narrows the band gap, it hinders the electron / hole transition (e... - / h + The recombination of electrons and charges prolongs the lifetime of charge carriers, allowing electrons to move freely at the heterojunction interface and generating an additional electric field. This makes it easier for photo-excited electrons and holes to migrate at the heterojunction. Electrons from transitions in one material (such as TiO2) transfer to another material (such as ZnO), while holes from the other material (such as ZnO) transfer to one material (such as TiO2). This increases the number of holes in one material (such as TiO2) and the number of electrons in the other material (such as ZnO). These electrons and holes can then react with substances such as water and oxygen to generate active groups. The reaction between the bacterial cell membrane and these active groups induces leakage of internal substances, further inactivating bacterial DNA and proteins. This achieves highly efficient sterilization of the environment where the photocatalytic antibacterial coating is applied, improving the safety of the application environment.

[0011] The photocatalytic antibacterial coating product of this utility model has the following advantages: On the one hand, by fixing a photocatalytic heterojunction antibacterial functional layer on the surface of the coating film, the presence of a photocatalytic heterojunction in the antibacterial functional layer reduces the band gap, making it easier for photo-excited electrons and holes to migrate at the heterojunction, thus avoiding electron / hole (e) ratios. - / h +) recombination, so that the electrons and holes significantly increase, which can react with water, oxygen and other substances to produce active groups. The reaction of the bacterial cell membrane with the active groups induces internal substance leakage, further inactivating the bacterial DNA and proteins, thereby enhancing the antibacterial effect of the photocatalytic heterojunction antibacterial functional layer itself, achieving the effect of efficient sterilization of the application site environment of the photocatalytic antibacterial coating product of the embodiment of the utility model, and improving the safety of the application site environment. On the other hand, by attaching the coating film layer to the wall surface and fixing the photocatalytic heterojunction antibacterial functional layer on the coating film layer, the photocatalytic antibacterial coating product can better decorate and protect the wall surface. In summary, the photocatalytic antibacterial coating product of the embodiment of the utility model can decorate and protect the wall surface and has the effect of efficient sterilization, and has important application value and market prospect.

[0012] In some embodiments, the photocatalytic heterojunction antibacterial functional layer comprises photocatalytic heterojunction antibacterial microbead units dispersedly embedded on the surface of the coating base layer.

[0013] In some embodiments, the photocatalytic heterojunction antibacterial microbead units comprise microbead carriers and photocatalytic heterojunction antibacterial nanoparticles dispersedly fixed on the surface of the microbead carriers.

[0014] In some embodiments, the microbead carriers are hollow microbead carriers.

[0015] In some embodiments, the microbead carriers are hollow glass microbead carriers.

[0016] In some embodiments, the photocatalytic heterojunction antibacterial nanoparticles are TiO2 / ZnO heterojunction nanoparticles.

[0017] In some embodiments, the photocatalytic heterojunction antibacterial nanoparticles comprise a TiO2 shell and a ZnO core located in the TiO2 shell, and the TiO2 shell and the ZnO core form TiO2 / ZnO heterojunction nanoparticles.

[0018] In some embodiments, the coating base layer is a water-based coating film layer.

[0019] In some embodiments, the coating base layer is a water-based acrylic coating film layer.

[0020] Additional aspects and advantages of the utility model will be partially given in the following description, some of which will become apparent from the following description, or be understood through the practice of the utility model. BRIEF DESCRIPTION OF DRAWINGS

[0021] The above and / or additional aspects and advantages of the utility model will become apparent and more readily appreciated from the following description of the embodiments, with reference to the following drawings, in which:

[0022] Fig. 1 It is a schematic view of the photocatalytic antibacterial coating product of the utility model;

[0023] Fig. 2 It is a structural schematic view of the photocatalytic heterojunction antibacterial microbead unit of the photocatalytic heterojunction antibacterial functional layer of the photocatalytic antibacterial coating product of the utility model.

[0024] Photocatalytic antibacterial coating product 1000; Coating base layer 1; Photocatalytic heterojunction antibacterial functional layer 2; Photocatalytic heterojunction antibacterial microbead unit 201; Microbead carrier 2011; Photocatalytic heterojunction antibacterial nanoparticle 2012; TiO2 shell 20121; ZnO core 20122. DETAILED DESCRIPTION

[0025] The embodiments of the utility model are described in detail below, and the examples of the embodiments are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the utility model and cannot be understood as limiting the utility model.

[0026] The embodiments of the utility model are described below in combination with Figs. 1-2 The photocatalytic antibacterial coating product 1000 of the embodiments of the utility model.

[0027] As Fig. 1 And Fig. 2 Indicated, the photocatalytic antibacterial coating product 1000 of the embodiments of the utility model, including coating base layer 1 and photocatalytic heterojunction antibacterial functional layer 2.

[0028] Among them, the coating base layer 1 is used to adhere to the wall surface, which can be the wall surface of the building wall surface, wooden surface, metal piece surface and other structural members. The coating base layer 1 adheres to the wall surface and has excellent adhesion, which can decorate and protect the wall surface.

[0029] The photocatalytic heterojunction antibacterial functional layer 2 is fixed on the surface of the coating base layer 1, and the photocatalytic heterojunction antibacterial functional layer 2 can kill bacteria in the application environment through its own photocatalytic heterojunction.

[0030] The antibacterial principle of the photocatalytic antibacterial coating product 1000 of the embodiments of the utility model is that: because the photocatalytic heterojunction antibacterial functional layer 2 has photocatalytic heterojunction, for example, TiO2 / ZnO heterojunction exists, under the action of light, the electrons of the two materials (such as TiO2 and ZnO) of the photocatalytic heterojunction jump and generate holes respectively, and the heterojunction formed by the two materials (such as TiO2 and ZnO) reduces the band gap, hinders the electron / hole (e - / h+ ) pairs, prolongs the lifetime of the carriers, so that the electrons are free to move at the heterojunction interface, generating an additional electric field, making the photo-excited electrons and holes more easily migrate at the heterojunction, wherein the transition of the electrons of one material (such as TiO2) is transferred to another material (such as ZnO), wherein the holes of another material (such as ZnO) are generated to one material (such as TiO2), so that the holes of one material (such as TiO2) are increased, and the electrons of another material (such as ZnO) are increased, which can react with water, oxygen and other substances, thereby producing active groups. The reaction of the bacterial cell membrane with the active groups induces internal substance leakage, further inactivates the bacterial DNA and proteins, thereby achieving the effect of high-efficiency sterilization of the application site environment of the photocatalytic antibacterial coating product 1000, and improving the safety of the application site environment.

[0031] The photocatalytic antibacterial coating product 1000 has the following advantages: on the one hand, the photocatalytic heterojunction antibacterial functional layer 2 is fixed on the surface of the coating film layer, and because the photocatalytic heterojunction antibacterial functional layer 2 has a photocatalytic heterojunction, the band gap is reduced, making the photo-excited electrons and holes more easily migrate at the heterojunction, avoiding the recombination of the electron / hole (e - / h + ) pairs, so that the electrons and holes are significantly increased, which can react with water, oxygen and other substances, thereby producing active groups. The reaction of the bacterial cell membrane with the active groups induces internal substance leakage, further inactivates the bacterial DNA and proteins, thereby enhancing the antibacterial effect of the photocatalytic heterojunction antibacterial functional layer 2 itself, achieving the effect of high-efficiency sterilization of the application site environment of the photocatalytic antibacterial coating product 1000, and improving the safety of the application site environment; on the other hand, the coating film layer is attached to the wall surface, and the photocatalytic heterojunction antibacterial functional layer 2 is fixed on the coating film layer, so that the photocatalytic antibacterial coating product 1000 can better decorate and protect the wall surface. In summary, the photocatalytic antibacterial coating product 1000 can realize high-efficiency antibacterial, improve the protection performance and has a decoration function, and has important application value and market prospect.

[0032] In some embodiments, the photocatalytic heterojunction antibacterial functional layer 2 includes photocatalytic heterojunction antibacterial microbead units 201 dispersedly embedded on the surface of the coating base layer 1. The photocatalytic heterojunction antibacterial microbead units 201 are dispersedly fixed on the surface of the coating base layer 1, realizing the solid loading of the antibacterial effective components on the surface of the coating base layer 1, so that the photocatalytic antibacterial coating product 1000 has better decoration and protection functions and high-efficiency sterilization functions.

[0033] In some embodiments, the photocatalytic heterojunction antibacterial microbead unit 201 comprises a microbead carrier 2011 and photocatalytic heterojunction antibacterial nanoparticles 2012 dispersed and fixed on the surface of the microbead carrier 2011. It can be understood that there are many challenges in the process of integrating photocatalytic heterojunction antibacterial nanoparticles 2012 into the coating body (i.e., organic matrix) to make photocatalytic antibacterial coatings; the film-forming agent (i.e., binder) and other components in the coating body will hinder the contact of light and reactants (such as oxygen, water) with the surface of the photocatalytic heterojunction antibacterial nanoparticles 2012, resulting in low photon utilization, thus making the performance of the photocatalytic antibacterial coating significantly lower than that of the photocatalytic heterojunction antibacterial powder used alone; in addition, the photocatalyst will also trigger the photodegradation reaction of the organic components in the photocatalytic antibacterial coating product 1000; the high specific surface area of the photocatalytic heterojunction antibacterial nanoparticles 2012 leads to a significant increase in the interfacial contact area between the photocatalytic heterojunction antibacterial nanoparticles 2012 and the binder, and a large amount of binder undergoes photodegradation reaction, which may cause the gradual disintegration of the coating film structure and affect the stability of the coating. Therefore, by dispersing and fixing the photocatalytic heterojunction antibacterial nanoparticles 2012 on the surface of the microbead carrier 2011 with low density, high specific surface area, good chemical stability and high light trapping efficiency through sol-gel method, the photocatalytic heterojunction antibacterial microbead unit 201 has high specific surface area, short diffusion path of charge carriers and micron-level size. The photocatalytic antibacterial coating obtained by uniformly mixing the photocatalytic heterojunction antibacterial microbead unit 201 with the coating body such as water-based acrylic water-based paint can reduce the degradation of the binder, has good film-forming performance, excellent adhesion and environmental friendliness, and also has high-efficiency antibacterial and decorative protective properties. Thus, by loading a large number of hollow glass microbeads with photocatalytic heterojunction antibacterial nanoparticles 2012, the purpose of uniformly mixing the antibacterial effective component with the coating body is achieved, the antibacterial performance of the coating is enhanced, and the degradation of the binder caused by the addition of the photocatalytic antibacterial agent is reduced. Therefore, the photocatalytic antibacterial coating product 1000 of this embodiment has high antibacterial performance, good decorative and protective properties, good adhesion and stable mechanical properties.

[0034] In some embodiments, the microbead carrier 2011 is a hollow microbead carrier. The hollow microbead carrier has low density, high specific surface area, good chemical stability and high light trapping efficiency, the photocatalytic heterojunction antibacterial nanoparticles 2012 are uniformly dispersed and loaded on the surface of the hollow microbead carrier to form the photocatalytic heterojunction antibacterial microbead unit 201, and the photocatalytic heterojunction antibacterial microbead unit 201 can accumulate on the surface of the coating base layer 1 when the photocatalytic antibacterial coating product 1000 is prepared after being mixed with the coating body, achieving the purpose of uniformly dispersing and loading the antibacterial effective component, i.e., the photocatalytic heterojunction antibacterial nanoparticles 2012, on the surface of the coating base layer 1. The photocatalytic antibacterial coating product 1000 of this embodiment has better performance. By using the hollow microbead carrier, the photon utilization is improved and the degradation of the binder is reduced.

[0035] In some embodiments, the microbead carrier 2011 is a hollow glass microbead carrier. The hollow glass microbead carrier has low density, high specific surface area, good chemical stability and high light trapping efficiency, and the photocatalytic heterojunction antibacterial nanoparticles 2012 are uniformly dispersed and loaded on the surface of the hollow glass microbead carrier to form photocatalytic heterojunction antibacterial microbead units 201. When the photocatalytic antibacterial coating product 1000 is prepared after the photocatalytic heterojunction antibacterial microbead units 201 are mixed with the coating base, the photocatalytic heterojunction antibacterial microbead units 201 can accumulate on the surface of the coating base 1, realizing uniform dispersion and loading of the antibacterial effective component, i.e., the photocatalytic heterojunction antibacterial nanoparticles 2012, on the surface of the coating base 1. The photocatalytic antibacterial coating product 1000 of this embodiment has better performance. By using the hollow glass microbead carrier, the photon utilization rate is improved, and the degradation of the binder is reduced.

[0036] In some embodiments, the photocatalytic heterojunction antibacterial nanoparticles 2012 are TiO2 / ZnO heterojunction nanoparticles. Under the action of light, the electrons of the TiO2 material and the ZnO material jump and generate holes, respectively. The heterojunction formed by the TiO2 material and the ZnO material narrows the band gap, hinders the recombination of the electron / hole (e - / h + ) pairs, prolongs the lifetime of the carriers, and makes the electrons freely move at the heterojunction interface, generating an additional electric field, making the photo-excited electrons and holes more easily migrate at the heterojunction. The electrons of the TiO2 material transfer to the ZnO material, and the holes of the ZnO material transfer to the TiO2 material. In this way, the holes of the TiO2 material increase, and the electrons of the ZnO material increase. These electrons and holes can react with water, oxygen and other substances to produce active groups. The reaction of the bacterial cell membrane with the active groups induces internal substance leakage, further inactivates the bacterial DNA and proteins, and thus kills the bacteria. The active groups can cause oxidative stress in the bacteria, and the extracellular active groups can enter the bacteria, causing a sharp increase in the level of intracellular active groups and reacting with antioxidant enzymes, disrupting the intracellular oxidative and antioxidant balance, and thus achieving a significantly high bactericidal effect.

[0037] In some embodiments, the photocatalytic heterojunction antibacterial nanoparticles 2012 include a TiO2 shell 20121 and a ZnO core 20122 located in the TiO2 shell 20121, and the TiO2 shell 20121 and the ZnO core 20122 form TiO2 / ZnO heterojunction nanoparticles. Under light, the electrons of the TiO2 shell 20121 jump to generate holes, and the electrons of the ZnO core 20122 also jump to generate holes. The electrons of the TiO2 shell 20121 transfer to the ZnO core 20122, and the holes of the ZnO core 20122 transfer to the TiO2 shell 20121, avoiding the recombination of the electron / hole (e- / h + ) recombination, so that the electrons and holes are significantly increased, and the electrons and holes can react with water, oxygen and other substances, thereby generating active groups, thereby achieving a significantly high bactericidal effect.

[0038] In some embodiments, the coating base layer 1 is a water-based coating film layer, which has good environmental safety, weather resistance, water resistance, adhesion and flexibility, and relatively low cost.

[0039] In some embodiments, the coating base layer 1 is a water-based acrylic coating film layer, which has good environmental safety, weather resistance, water resistance, adhesion and flexibility, and relatively low cost.

[0040] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" means that the specific features, structures, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the exemplary description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0041] Although the embodiments of the present application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and purposes of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A photocatalytic antibacterial coating article, characterized by, Comprise: a coating base layer for adhering to a wall surface; a photocatalytic heterojunction antibacterial functional layer fixed on the surface of the coating base layer.

2. The photocatalytic antibacterial coating article according to claim 1, wherein, The photocatalytic heterojunction antibacterial functional layer comprises photocatalytic heterojunction antibacterial microbead units dispersedly embedded on the surface of the coating base layer.

3. The photocatalytic antibacterial coating article according to claim 2, wherein, The photocatalytic heterojunction antibacterial microbead units comprise a microbead carrier and photocatalytic heterojunction antibacterial nanoparticles dispersedly fixed on the surface of the microbead carrier.

4. The photocatalytic antibacterial coating article according to claim 3, wherein, The microbead carrier is a hollow microbead carrier.

5. The photocatalytic antibacterial coating article according to claim 4, wherein, The microbead carrier is a hollow glass microbead carrier.

6. The photocatalytic antibacterial coating article according to claim 3, wherein, The photocatalytic heterojunction antibacterial nanoparticles are TiO2 / ZnO heterojunction nanoparticles.

7. The photocatalytic antibacterial coating article according to claim 6, wherein, The photocatalytic heterojunction antibacterial nanoparticles comprise a TiO2 shell and a ZnO core located in the TiO2 shell, and the TiO2 shell and the ZnO core form TiO2 / ZnO heterojunction nanoparticles.

8. The photocatalytic antibacterial coating article according to any one of claims 1-7, wherein, The coating base layer is a water-based coating film layer.

9. The photocatalytic antibacterial coating article according to claim 8, wherein, The coating base layer is a water-based acrylic coating film layer.

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