Enhanced antibacterial and anti-adhesion coating for air conditioner fan wheel and preparation and application thereof

Abstract

The present application relates to a kind of air-conditioning wind wheel coating for enhanced antibacterial anti-adhesion coating and its preparation and application, the coating includes the following weight percentage of raw material components: 1%~5% self-crosslinking fluorine-containing polyacrylic resin emulsion, polyethylene glycol modified nano zinc oxide 1%~10%, fluorine-containing surface modified nano zinc oxide 1%~10%, deionized water 75~97%.The present application uses polyethylene glycol modified nano zinc oxide and fluorine compound modified nano zinc oxide by room temperature curing mode solidification in wind wheel surface, by the micro-nano structure of large particle size fluorine compound modified nano zinc oxide and small particle size polyethylene glycol modified nano zinc oxide in wind wheel surface structure, wherein polyethylene glycol modified nano zinc oxide enhances the bactericidal capacity of nano zinc oxide, micro-nano structure enhances the bactericidal capacity of wind wheel surface, and constructs enhanced antibacterial anti-adhesion coating in wind wheel surface.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of antibacterial and anti-adhesion coatings, and relates to an enhanced antibacterial and anti-adhesion coating for air conditioner fan wheel coating and preparation and application thereof. BACKGROUND

[0002] The air conditioner fan wheel is a main air supply component of the air conditioner. In the long-term use process, the surface is easy to adhere to dust and bacteria, and under certain temperature and humidity conditions, it is easy to become a breeding ground for bacteria, producing a large number of pathogenic bacteria groups, and releasing or decomposing various irritating compounds to produce odors. In the use of the air conditioner, pathogenic bacteria and odors are exchanged with the environment with air, which seriously endangers human health.

[0003] In order to resist the adverse effects of bacteria, people need to clean the dust on the surface of the fan wheel regularly, but the fan wheel is often complex to disassemble and assemble. In the prior art, people often reduce the influence of bacteria by coating organic, inorganic antibacterial agents or organic-inorganic composite antibacterial agents inside and on the surface of the fan wheel. However, when the simple addition of antibacterial agents is adopted, the organic antibacterial agents have short time effectiveness, and some organic antibacterial agents have low toxicity. When inorganic antibacterial agents are used, the killed bacterial membranes can still adhere to the surface of the fan wheel, resulting in passivation of the antibacterial agents and reduction or failure of the antibacterial performance. The dead bacteria left on the surface can also provide nutrition for the growth of bacteria, leading to the failure of the antibacterial effect of the antibacterial agents. Therefore, when the simple addition of antibacterial agents is adopted, a large amount of antibacterial agents often need to be added, resulting in increased cost and the risk of increasing bacterial drug resistance.

[0004] CN112358783A discloses a double-ion composite antibacterial coating, which comprises 20-40 parts by weight of water-based resin, 0.1-10 parts by weight of silver-zinc composite antibacterial agent, 0.9-1.4 parts by weight of organic antibacterial agent, 0.05-0.2 parts by weight of thickening agent, 0.25-1.5 parts by weight of dispersing agent, 0.2-2 parts by weight of defoaming agent, 0.1-1 parts by weight of leveling agent, 0.2-0.8 parts by weight of film-forming aid, and 40-70 parts by weight of deionized water. When the simple addition of antibacterial agents is adopted, a large amount of antibacterial agents often need to be added, which increases the risk of bacterial drug resistance, and the problem of reduced mildew resistance grade also exists due to the easy adhesion of dust. SUMMARY

[0005] The purpose of the present application is to provide an enhanced antibacterial and anti-adhesion coating for air conditioner fan wheel coating and preparation and application thereof. After being coated on the surface of the fan wheel, the present application constructs a surface coating with micro-nano structure with bactericidal and antibacterial functions, which can effectively reduce the adhesion of bacteria to the surface of the fan wheel, inhibit the reproduction of bacteria, and resist the adhesion of bacteria to the surface of the fan wheel.

[0006] The object of the present application can be achieved by the following technical solutions:

[0007] One of the technical solutions of the present application provides an enhanced antibacterial and anti-adhesion coating for air conditioner fan coating, comprising the following raw material components by weight percentage: self-crosslinking fluorine-containing polyacrylic resin emulsion 1%~5%, polyethylene glycol modified nano zinc oxide 1%~10%, fluorine-containing surface modified nano zinc oxide 1%~10%, deionized water 75~97%.

[0008] Further, the fluorine content of the self-crosslinking fluorine-containing polyacrylic resin emulsion is 8-12%. The solid content is 40~50%, and the density is 1.0~1.2 g / cm 3 The molecular formula of the fluorine-containing polyacrylic resin in the emulsion is:

[0009] Wherein, x, y, z, w are positive integers.

[0010] Further, the self-crosslinking fluorine-containing polyacrylic resin emulsion is purchased from Fuxin Ruifeng Fluorine Chemical Co., Ltd., and its brand is RF101.

[0011] Further, the particle size of the polyethylene glycol modified nano zinc oxide is 10~20nm, and the particle size of the fluorine-containing surface modified nano zinc oxide is 50~100nm.

[0012] Further, the polyethylene glycol modified nano zinc oxide is prepared by the following method:

[0013] The water solution of nano zinc oxide is weighed, and then γ-aminopropyl triethoxysilane is added dropwise, stirred and heated in water bath to obtain nano zinc oxide with surface amination, then polyethylene glycol is added and the stirring reaction is continued to obtain polyethylene glycol modified nano zinc oxide.

[0014] Further, the volume ratio of the water solution of nano zinc oxide, γ-aminopropyl triethoxysilane and polyethylene glycol is (80~120):(0.1~0.3):1, wherein the solid content of the water solution of nano zinc oxide is 20~40%.

[0015] Further, the temperature of water bath heating is 50~70℃, and the time is 1-3h.

[0016] Further, the temperature of the continuous stirring reaction is room temperature, and the time is 3-5h.

[0017] Further, the fluorine-containing surface modified nano zinc oxide is prepared by the following method:

[0018] Weigh out an aqueous solution of nano zinc oxide and stir it evenly with ethanol. Then add γ-aminopropyltriethoxysilane and stir the mixture at room temperature to obtain surface-aminated nano zinc oxide. Then add heptadecafluorodecyltrimethylsilane and continue stirring at room temperature to obtain fluorine-modified nano zinc oxide.

[0019] Furthermore, the volume ratio of nano zinc oxide aqueous solution, ethanol, γ-aminopropyltriethoxysilane and heptadecafluorodecyltrimethylsilane is (80~100):10:(0.1~0.3):(0.4~0.6), wherein the solid content of the nano zinc oxide aqueous solution is 20~40%.

[0020] The second technical solution of the present invention provides a method for preparing an enhanced antibacterial and anti-adhesion coating for air conditioner impeller coating. Deionized water, fluorine-modified nano zinc oxide, polyethylene glycol-modified nano zinc oxide, and self-crosslinking fluorinated polyacrylic acid resin emulsion are added sequentially to a container and stirred to obtain the enhanced antibacterial and anti-adhesion coating, which is the target product.

[0021] The third technical solution of the present invention provides an application of an enhanced antibacterial and anti-adhesion coating for air conditioning impeller coating in the coating of impeller surface.

[0022] Compared with the prior art, the present invention uses a surface-modified inorganic antibacterial nanomaterial with polyethylene glycol groups and the fluorinated inorganic antibacterial nanomaterial, and uses a self-crosslinking fluorinated polyacrylic resin to make a coating. After coating the surface of the wind turbine, a micro-nano structured surface coating with bactericidal and antibacterial functions is constructed on the wind turbine surface by using fluorinated compound-modified nano-zinc oxide with larger particle size and polyethylene glycol-modified nano-zinc oxide with smaller particle size. While having a bactericidal function, it can effectively reduce the adhesion of bacteria to the wind turbine surface, inhibit bacterial reproduction, and resist bacterial adhesion to the wind turbine surface. Attached Figure Description

[0023] Figure 1 This is a SEM image of the coating surface prepared in Example 5. Detailed Implementation

[0024] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. These embodiments are based on the technical solution of the present invention and provide detailed implementation methods and specific operating procedures. However, the scope of protection of the present invention is not limited to the following embodiments.

[0025] In the following embodiments, the sources of each raw material are as follows:

[0026] Self-crosslinking fluorinated polyacrylic acid resin emulsion: density 1.1 g / cm³ 3 Solid content 45%, fluorine content 10%, Fuxin Ruifeng Fluorochemical Co., Ltd., specification RF101;

[0027] Nano zinc oxide aqueous solution (component A): particle size 50-100 nm, solid content 30%, purchased from Daxincong Nanometer Technology (Changzhou) Co., Ltd.;

[0028] Nano zinc oxide aqueous solution (component C): particle size 10-20 nm, solid content 30%, PH=8-11, purchased from Daxincong Nanometer Technology (Changzhou) Co., Ltd.;

[0029] Polyethylene glycol: PEG-300, purchased from Haian Petrochemical Factory in Jiangsu Province;

[0030] Gamma-aminopropyl triethoxysilane: KH550, chemical pure, purchased from Sigma-Aldrich (Shanghai) Trading Co., Ltd.;

[0031] Heptadecafluorodecyl trimethylsilane, purchased from Sigma-Aldrich (Shanghai) Trading Co., Ltd.

[0032] The rest of the raw materials or processing techniques, if not specifically mentioned, are all conventional commercially available raw materials or conventional processing techniques in the art.

[0033] The application provides a kind of enhanced antibacterial and anti-adhesion coating, and its preparation process is as follows: deionized water, fluorine surface modified nano zinc oxide (added in solution form), polyethylene glycol modified nano zinc oxide (added in solution form), self-crosslinking fluorine-containing polyacrylic acid resin emulsion are sequentially added into container, and stirring is mixed to obtain enhanced antibacterial and anti-adhesion coating.

[0034] In the following examples, the fluorine-containing surface modified nano zinc oxide used is prepared by the following method:

[0035] 90ml of nano zinc oxide aqueous solution (number A) and 10ml of ethanol are weighed and stirred uniformly, then 0.2ml of gamma-aminopropyl triethoxysilane is added, the stirring speed is 600r / min, and magnetic stirring is carried out at room temperature for 2h to obtain nano zinc oxide with surface aminization, then 0.5mL of heptadecafluorodecyl trimethylsilane is added, and magnetic stirring is continued at room temperature for 48h to obtain fluorine surface modified nano zinc oxide aqueous solution (marked as component B).

[0036] The polyethylene glycol modified nano zinc oxide used is prepared by the following method:

[0037] 100ml of nano zinc oxide aqueous solution (component C) is weighed, then 0.2ml of gamma-aminopropyl triethoxysilane is added dropwise, the stirring speed is 600r / min, the water bath temperature is 60℃, and magnetic stirring is carried out for 2h to obtain nano zinc oxide with surface aminization, then 1.0mL of polyethylene glycol PEG-300 is added, and magnetic stirring is continued at room temperature for 4h to obtain polyethylene glycol modified nano zinc oxide aqueous solution (marked as component D).

[0038] Examples 1-7 and Comparative Examples 1-7 were prepared according to the above preparation process;

[0039] In Comparative Example 8, Comparative Example 10, and Comparative Example 11, the polyethylene glycol modified nano zinc oxide used was prepared by the following method:

[0040] A 100 ml aqueous solution of nano zinc oxide (Component A) was weighed, and then 0.2 ml of γ-aminopropyl triethoxysilane was added dropwise. The stirring speed was 600 r / min, the water bath temperature was 60°C, and the magnetic stirring was performed for 2 h. Thus, the surface-aminated nano zinc oxide was obtained. Then, 1.0 mL of polyethylene glycol PEG-300 was added, and the magnetic stirring was continued at room temperature for 4 h. Thus, the polyethylene glycol modified nano zinc oxide aqueous solution (denoted as Component E) was obtained.

[0041] In Comparative Example 9, Comparative Example 10, and Comparative Example 12, the fluorine-containing surface modified nano zinc oxide used was prepared by the following method:

[0042] A 90 ml aqueous solution of nano zinc oxide (Component C) was stirred uniformly with 10 ml of ethanol, and then 0.2 ml of γ-aminopropyl triethoxysilane was added. The stirring speed was 600 r / min, and the magnetic stirring was performed at room temperature for 2 h. Thus, the surface-aminated nano zinc oxide was obtained. Then, 0.5 mL of heptadecafluorodecyl trimethylsilane was added, and the magnetic stirring was continued at room temperature for 48 h. Thus, the fluorine surface modified nano zinc oxide aqueous solution (denoted as Component F) was obtained.

[0043] The raw material ratios of the examples and comparative examples are shown in Table 1.

[0044] Table 1 Raw material ratios (A, B, C, D, and E are calculated based on the solid content of each component)

[0045]

[0046] The coating obtained in each of the above examples or comparative examples was measured, wherein the anti-adhesion performance to bacteria was measured by a contact angle test method. The contact angle refers to the angle between the solid-liquid interface and the gas-liquid interface inside the liquid, which is called the contact angle or the wetting angle. The larger the contact angle, the better the anti-adhesion performance. The antibacterial performance after coating was tested by the standard method of JISZ 2801-2010, and the specific structure is shown in Table 2.

[0047] Table 2

[0048]

[0049] Figure 1 The SEM observation of the coating surface constructed for Example 5 showed that the nano zinc oxide with different particle sizes constructed a good surface micro-nano structure.

[0050] The anti-bacterial and anti-adhesion coating prepared in the present application, after being coated on the surface of the wind wheel to form a coating, constructs a surface coating with micro-nano structure with sterilization and anti-bacterial functions through nano particles of different sizes. The zinc oxide nano particles with larger particle size are the main components for constructing the micro-nano structure, and a small protruding structure on the surface of the wind wheel after coating is constructed. After fluorination, the surface energy is low, further increasing the contact angle of the material and the ability to prevent dust and bacterial adhesion. The nano particles with smaller particle size are attached to the surface of the large particle size, on one hand enhancing the surface structure of the protruding shape of the protrusion, but mainly providing stronger sterilization capacity. After modification by polyethylene glycol, the sterilization performance against bacteria is further enhanced. The combination of the two effectively resists the adhesion of bacteria on the surface of the wind wheel and the ability to inhibit the reproduction of bacteria.

[0051] In the formulations of Comparative Examples 8 and 9, since the particle sizes of the fluorinated zinc oxide and the polyethylene glycolized zinc oxide are the same, no micro-nano structure is constructed in the true sense, so the contact angles are close, and the dust prevention performance and the anti-bacterial performance are not as good as that of Example 5. In the formulation of Comparative Example 10, since the polyethylene glycolized zinc oxide is large in particle size and the fluorinated zinc oxide is small in particle size, the small particle size fluorinated zinc oxide is attached to the surface of the large particle size polyethylene glycolized zinc oxide, forming a certain micro-nano structure. However, the polyethylene glycolized zinc oxide, which mainly plays an anti-bacterial role, is partially covered by the small particle size fluorinated zinc oxide, resulting in an anti-bacterial performance not as good as that of Example 5. The small particle size fluorinated zinc oxide has gaps between them, and does not form a good waterproof film, resulting in defects, so the contact angle is not as good as that of Example 5, that is, the adhesion of dust is reduced. Comparative Example 8 uses the same large particle size zinc oxide for fluorination and polyethylene glycolization, although the anti-bacterial performance is not as high as that of Comparative Example 9 with smaller particle size, but the zinc oxide is closely arranged, with small gaps, and can form a waterproof film, so the contact angle is larger than that of Comparative Example 10.

[0052] The above description of the examples is for the convenience of those of ordinary skill in the art to understand and use the invention. Those skilled in the art can easily make various modifications to these examples, and apply the general principles described herein to other examples without creative labor. Therefore, the present application is not limited to the above examples, and improvements and modifications made by those skilled in the art without departing from the scope of the present application should be within the scope of protection of the present application.

Claims

1. A reinforced antibacterial and anti-adhesive coating for air conditioning fan wheel coating, characterized by, The raw material components include the following weight percentages: 1-5% of self-crosslinking fluorine-containing polyacrylic resin emulsion, 5-10% of polyethylene glycol modified nano zinc oxide, 5-10% of fluorine-containing surface modified nano zinc oxide, and 75-97% of deionized water; The polyethylene glycol modified nano zinc oxide is prepared by the following method: The water solution of nano zinc oxide is weighed, and then γ-aminopropyl triethoxysilane is added dropwise, and the water bath is heated with stirring to obtain nano zinc oxide with surface amination, and then polyethylene glycol is added for continuous stirring reaction to obtain polyethylene glycol modified nano zinc oxide; The volume ratio of the water solution of nano zinc oxide, γ-aminopropyl triethoxysilane and polyethylene glycol is (80-120):(0.1-0.3):1, wherein the solid content of the water solution of nano zinc oxide is 20-40%; The temperature of water bath heating is 50-70℃, and the time is 1-3h; The temperature of continuous stirring reaction is room temperature, and the time is 3-5h; The fluorine-containing surface modified nano zinc oxide is prepared by the following method: The water solution of nano zinc oxide is weighed and stirred with ethanol, then γ-aminopropyl triethoxysilane is added, and the stirring reaction is carried out at room temperature to obtain nano zinc oxide with surface amination, and then heptadecafluorodecyl trimethyl silane is added for continuous stirring at room temperature to obtain fluorine-containing surface modified nano zinc oxide; The volume ratio of the water solution of nano zinc oxide, ethanol, γ-aminopropyl triethoxysilane and heptadecafluorodecyl trimethyl silane is (80-100):10:(0.1-0.3):(0.4-0.6), wherein the solid content of the water solution of nano zinc oxide is 20-40%; The particle size of the polyethylene glycol modified nano zinc oxide is 10-20nm, and the particle size of the fluorine-containing surface modified nano zinc oxide is 50-100nm; The self-crosslinking fluorine-containing polyacrylic resin emulsion is purchased from Fuxin Ruifeng Fluorine Chemical Co., Ltd., and its model is RF101.

2. A method for preparing an enhanced antibacterial and anti-adhesive coating for air conditioning fan wheel coating according to claim 1, characterized in that, Deionized water, fluorine-containing surface modified nano zinc oxide, polyethylene glycol modified nano zinc oxide and self-crosslinking fluorine-containing polyacrylic resin emulsion are sequentially added into a container, and then stirred and mixed to obtain the enhanced antibacterial and anti-adhesion coating, which is the target product.

3. Application of the enhanced antibacterial and anti-adhesion coating for air conditioner wind wheel coating in wind wheel surface coating according to claim 1.

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