Method for removing bacteria and odor from an air conditioning system for a vehicle

Abstract

The application discloses a bacteria and peculiar smell removing method for an air conditioning system of an automobile, and comprises the following steps: 1) preparing a nano composite functional material with a photocatalytic function; 2) replacing an existing filter with an antibacterial and mildewproof high-efficiency low-resistance air conditioner filter; 3) modifying a shell material of the air conditioning system; 4) modifying a material of an air duct; and 5) modifying a surface of an evaporator to form a modified surface coating. The nano composite functional material with the photocatalytic function used in the method can remove VOC, bacteria and mildew in air without excitation of ultraviolet light, volatile organic compounds are lowly emitted under high-temperature conditions (65 DEG C), peculiar smell reaches 3.0 points of 6-grade evaluation, and the assembly is ensured to be odor-friendly at a source.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of automotive interiors, and particularly relates to a bacteria and peculiar smell removal method for an air conditioning system of an automobile. BACKGROUND

[0002] With the improvement of people's living standards, the public has put forward higher health and quality demands on the environment. The scale of the health industry in China is increasing year by year, and the involved fields radiate to the household, medical, automobile, and pension industries. Through network public opinion analysis, more than 70% of respondents pay more and more attention to health-related technologies. At present, the domestic automobile market has a huge stock, and users will emit peculiar smell after using a new car for a period of time. This pain point has become the main problem of user after-sales complaints.

[0003] On the market, the main technical solution for removing pollutants in the air of the automobile air conditioning system is to use air conditioner filters or negative ion generators and other electronic components. However, the negative ion generator uses an electric arc or corona method to generate negative oxygen ions, which will produce ozone harmful to the human body in this process. In addition, from the user's use scene analysis, bacteria and mold breeding mainly occurs on the surface of the air conditioner filter and the evaporator, especially after the cooling mode is started in the plum rain season or summer. The humidity around the evaporator is extremely large. This dim, humid, and cold environment provides the best breeding conditions for bacteria and mold. Pollutants will deposit in the air conditioning box and the air duct. The breeding of these pollutants will have a great impact on the respiratory quality and health safety of users in the third space of the automobile. SUMMARY

[0004] The technical problem to be solved by the present application is to provide a bacteria and peculiar smell removal method for an air conditioning system of an automobile. The nano composite functional material with photocatalytic function used in the method can remove VOC, bacteria, and mold in the air without the excitation of ultraviolet light. The volatile organic compound emission is low under high temperature conditions (65 DEG C), and the odor is 3.0 points in the 6-level evaluation, which ensures the odor friendliness of the assembly at the source.

[0005] To solve the above technical problems, the application adopts the technical scheme as follows :

[0006] A bacteria and peculiar smell removal method for an air conditioning system of an automobile, comprising the following steps:

[0007] 1) Preparation of a nano composite functional material with photocatalytic function:

[0008] 1-1) Disperse 5-20 parts of nano-titanium dioxide, 3-15 parts of nano-zinc oxide, 3-15 parts of copper oxide powder in 40-70 parts of dopamine solution, and add 20-45 parts of pH buffer, and fully react at 150-200°C to obtain inorganic composite precipitate;

[0009] 1-2) Disperse the inorganic composite precipitate in a mixed solution of ethanol and acetonitrile, and then add 10-20 parts of tetraethyl orthosilicate, heat to 85-95°C for reaction, and after the reaction is completed, introduce hydrogen fluoride vapor for corrosion to obtain a nano-composite functional stock solution with photocatalytic function;

[0010] 1-3) Distill the nano-composite functional stock solution until a nano-composite functional powder with photocatalytic function is obtained;

[0011] 2) Replace the existing filter with an antibacterial and mildew-resistant high-efficiency low-resistance air conditioner filter:

[0012] 2-1) The antibacterial and mildew-resistant high-efficiency low-resistance air conditioner filter is composed of an electrostatic stationary filter layer and an activated carbon paper layer stacked on top of each other;

[0013] 2-2) The electrostatic stationary filter layer is composed of a skeleton layer, a melt-blown layer, and a primary filter layer; the skeleton layer or the primary filter layer is impregnated with a nano-composite functional material with photocatalytic function to make the filter have antibacterial and mildew-resistant functions;

[0014] 3) Modification of air conditioner system shell material:

[0015] The modified master batch of the air conditioner system shell material is composed of the following raw materials in parts by weight:

[0016] Polypropylene resin 55-80 parts, talc: 15-40 parts,

[0017] Nano-composite functional powder: 5-10 parts, antioxidant: 0.1-0.2 parts,

[0018] Lubricant: 2-4 parts;

[0019] 4) Modification of air duct material:

[0020] The modified master batch of the air duct material is composed of the following raw materials in parts by weight:

[0021] Polyethylene resin: 60-80 parts, nano-composite functional powder: 10-20 parts,

[0022] Antioxidant: 0.1-0.2 parts, dispersing agent: 0.5-5 parts, lubricant: 1-5 parts;

[0023] 5) Modification of the surface of the evaporator to form a modified surface coating:

[0024] Mixing 35-45 parts of nanocomposite functional stock solution, 25-35 parts of silica sol, 25-35 parts of lithium silicate, and 4-8 parts of silane coupling agent uniformly to form a surface modification liquid, immersing the evaporator into the surface modification liquid, taking out the evaporator after immersion and baking to form a modified surface coating on the surface of the evaporator.

[0025] As an embodiment, in step 1-2), the volume ratio of the ethanol and acetonitrile is 1.8-2.2:1.

[0026] As an embodiment, in step 1-2), the time for the corrosion by the hydrogen fluoride vapor is 8-10 hours.

[0027] As an embodiment, in step 2-2), the specific steps for the impregnation treatment of the skeleton layer or the primary filter layer using the nanocomposite functional material with photocatalytic function are as follows: mixing 5-10 parts of nanocomposite functional stock solution with 5-10 parts of one or more of chitosan, sorbitol, vanillin, sulfonamide, and o-phenylphenol, and diluting with 80-90 parts of a mixed solvent of ethanol and deionized water in a volume ratio of 1:1 to obtain a functional material impregnation liquid; placing the skeleton layer or the primary filter layer in the functional material impregnation liquid, taking out the skeleton layer or the primary filter layer, and then extruding by a roller, followed by drying at 80-100℃ and further drying at 120-140℃.

[0028] As a preferred embodiment, the time for placing the skeleton layer or the primary filter layer in the functional material impregnation liquid is 10-20 minutes.

[0029] As a preferred embodiment, the time for drying at 80-100℃ is 5-15 minutes.

[0030] As a preferred embodiment, the time for drying at 120-140℃ is 5-15 minutes.

[0031] As an embodiment, in step 5), the baking temperature is 100-200℃, and the time is 3-5 minutes.

[0032] As an embodiment, in step 5), the thickness of the modified surface coating is 1-5um.

[0033] Any range recited in the present application includes the end values and any intervening values and any sub-range comprised of any such values.

[0034] Unless otherwise specified, each raw material in the present application can be obtained by commercial purchase, and the equipment used in the present application can adopt conventional equipment in the field or refer to the existing technology in the field.

[0035] Compared with the prior art, the application has the beneficial effects as follows :

[0036] Compared with the traditional photocatalyst material, the nanometer composite functional material with photocatalytic function used in the application can remove VOC, bacteria and mold in the air without excitation of ultraviolet light, the volatile organic compound is lowly emitted under high temperature condition (65 DEG C), the odor is 3.0 points of 6-level evaluation, and the odor friendliness of the assembly is ensured at the source. BRIEF DESCRIPTION OF DRAWINGS

[0037] Figure 1 It is a schematic view of the parts of the antibacterial and mildew-proof high-efficiency and low-resistance air conditioner filter of the application;

[0038] Figure 2 It is a schematic view of the cross-section structure of the electrostatic stationary pole material in the application. DETAILED DESCRIPTION

[0039] In order to more clearly illustrate the application, the application will be further described below in combination with preferred embodiments. It should be understood by those skilled in the art that the specific description below is illustrative rather than limiting, and the protection scope of the application should not be limited thereto.

[0040] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0041] It should be understood that the terms "length", "width", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the application.

[0042] In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the application, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0043] As one aspect of the application, the application is a bacteria and odor removal method of an air conditioning system for a vehicle, comprising the following steps:

[0044] 1) Preparation of nanocomposite functional material with photocatalytic function:

[0045] 1-1) Disperse 5-20 parts of nanometer titanium dioxide, 3-15 parts of nanometer zinc oxide, and 3-15 parts of copper oxide powder in 40-70 parts of dopamine solution, and add 20-45 parts of pH buffer, and fully react at 150-200°C to obtain inorganic composite precipitate;

[0046] 1-2) Disperse the inorganic composite precipitate in a mixed solution of ethanol and acetonitrile, then add 10-20 parts of tetraethyl orthosilicate, heat to 85-95°C for reaction, and after the reaction is completed, pass hydrogen fluoride vapor to corrode it to obtain a nanocomposite functional stock solution with photocatalytic function;

[0047] 1-3) Distill the nanocomposite functional stock solution until nanocomposite functional powder with photocatalytic function is obtained;

[0048] 2) Replace the existing filter with an antibacterial and mildew-resistant high-efficiency low-resistance air conditioner filter:

[0049] 2-1) The antibacterial and mildew-resistant high-efficiency low-resistance air conditioner filter is composed of an electrostatic stationary filter layer 1 and an activated carbon paper layer 2 stacked on top of each other (see Figure 1 );

[0050] 2-2) The electrostatic stationary filter layer 1 is composed of a skeleton layer 11, a melt-blown layer 12, and a primary filter layer 13 (see Figure 2 ); the skeleton layer or the primary filter layer is impregnated with nanocomposite functional material with photocatalytic function to make the filter antibacterial and mildew-resistant;

[0051] 3) Modification of air conditioner system shell material:

[0052] The modified master batch of the air conditioner system shell material is composed of the following raw materials by weight fraction:

[0053] Polypropylene resin 55-80 parts, talc: 15-40 parts,

[0054] Nanocomposite functional powder: 5-10 parts, antioxidant: 0.1-0.2 parts,

[0055] Lubricant: 2-4 parts;

[0056] 4) Modification of air duct material:

[0057] The modified master batch of the air duct material is composed of the following raw materials by weight fraction:

[0058] Polyethylene resin: 60-80 parts, nanocomposite functional powder: 10-20 parts,

[0059] Antioxidant: 0.1-0.2 parts, dispersant: 0.5-5 parts, lubricant: 1-5 parts;

[0060] 5) Modification of the surface of the evaporator to form a modified surface coating:

[0061] Mix 35-45 parts of the nano-composite functional stock solution, 25-35 parts of silica sol, 25-35 parts of lithium silicate, and 4-8 parts of silane coupling agent uniformly to form a surface modification liquid. Dip the evaporator into the surface modification liquid, take out the evaporator after dipping, and bake to form a modified surface coating on the surface of the evaporator.

[0062] In some embodiments, in step 1-2), the volume ratio of ethanol and acetonitrile is 1.8-2.2:1.

[0063] In some embodiments, in step 1-2), the time for corrosion by passing hydrogen fluoride vapor is 8-10 hours.

[0064] In some embodiments, in step 2-2), the specific steps for impregnating treatment of the skeleton layer or the primary filter layer using nano-composite functional materials with photocatalytic function are as follows: mix 5-10 parts of nano-composite functional stock solution with 5-10 parts of one or more of chitosan, sorbitol, vanillin, sulfonamide, and o-phenylphenol, and dilute with 80-90 parts of a mixed solvent of ethanol and deionized water in a volume ratio of 1:1 to obtain a functional material impregnation liquid; place the skeleton layer or the primary filter layer in the functional material impregnation liquid for 10-20 minutes, take out the skeleton layer or the primary filter layer, pass it through a roller extrusion, then dry at 80-100°C for 5-15 minutes, and then dry at 120-140°C for 5-15 minutes. Two drying can improve the adhesion of the nano-composite functional stock solution.

[0065] In some embodiments, in step 5), the baking temperature is 100-200°C; the time is 3-5 min, to solidify the nano-composite functional stock solution

[0066] In some embodiments, in step 5), the thickness of the modified surface coating is 1-5um.

[0067] Example 1

[0068] A method for removing bacteria and odor from an air conditioning system for a car, comprising the following steps:

[0069] 1) Preparation of nano-composite functional materials with photocatalytic function:

[0070] 1-1) Disperse 10 parts of nano-titanium dioxide, 5 parts of nano-zinc oxide, and 5 parts of copper oxide powder in 55 parts of dopamine solution, and add 25 parts of a PH buffer, and fully react at 180°C to obtain an inorganic composite precipitate;

[0071] 1-2) Disperse the precipitate in a 2:1 ratio of ethanol and acetonitrile solution, and add 15 parts of tetraethyl orthosilicate. After the reaction is completed at 90°C, corrode it by hydrogen fluoride vapor for 8.5 hours to finally obtain a nano-composite functional stock solution with photocatalytic function;

[0072] 1-3) Distill the stock solution to obtain a nano-composite functional powder with photocatalytic function;

[0073] 2) Antibacterial and mildew-proof high-efficiency low-resistance air conditioner filter:

[0074] 2-1) The structure of the antibacterial and mildew-proof high-efficiency low-resistance air conditioner filter is two layers, which are an electrostatic stationary filter material layer and an activated carbon paper layer (as shown in Figure 1 ), and the two can be fixed together by a plastic frame, and then installed and fixed in the air conditioning system. Compared with the filter designed by clamping carbon cloth, the structure can reduce the increase in air resistance caused by clamping activated carbon in the filter material and then compounding it with hot melt adhesive, thereby reducing the overall filter air resistance;

[0075] 2-2) The electrostatic stationary material is composed of a skeleton layer, a melt-blown layer, and a primary filter layer (see Figure 2 ), and the skeleton layer is impregnated with nano-composite functional material with photocatalytic function to make the filter have antibacterial and mildew-proof functions;

[0076] The impregnation process is as follows: mix 8 parts of the nano-composite functional stock solution with 8 parts of one or more of chitosan, sorbitol, vanillin, sulfonamide, and o-phenylphenol, and dilute with 84 parts (volume ratio 1:1) of a mixed solvent of ethanol and deionized water; pass the skeleton layer through the functional material solution tank, then pass it through a roller extrusion, and then pass it through a pre-drying process at 90°C for 6 minutes and a post-drying process at 130°C for 6 minutes, to finally obtain a filter material with antibacterial and mildew-proof functions.

[0077] 3) Shell material modification:

[0078] The shell material of the existing automobile air conditioning system is usually polypropylene material, which is realized by injection molding process. The shell parts involved include the blower shell, the main body shell, and the evaporator shell. The shell material modification master batch according to parts by weight is composed of the following raw materials:

[0079] Polypropylene resin: 70 parts, talc: 20 parts, nano-composite functional powder: 8 parts, antioxidant: 0.1 part, lubricant: 2 parts;

[0080] 4) Modified material for air duct:

[0081] Most of the current automobile air conditioning air duct materials are HDPE, and XPE, which are polyethylene materials, are realized by blow molding process; the air duct material modified master batch of the application is composed of the following raw materials by weight fraction:

[0082] Polyethylene resin: 75 parts, nano composite functional powder: 15 parts, antioxidant: 0.1 part, dispersing agent: 4.5 parts, lubricant: 4.5 parts.

[0083] 5) Evaporator surface modification:

[0084] Mix 35 parts of nano composite functional solution, 30 parts of silica sol, 30 parts of lithium silicate, and 5 parts of silane coupling agent to form a surface modification liquid. Dip the evaporator into the surface modification liquid and bake at 150°C for 4 minutes to form a 3um thick surface modification coating.

[0085] After detection, the automobile air conditioning system of the embodiment after modification can remove VOC, bacteria and mold in the air without the excitation of ultraviolet light. The volatile organic compounds are low-emission under high temperature conditions (65°C), and the odor evaluation method according to VDA270 can reach 3.0 points of 6-level evaluation.

[0086] Example 2

[0087] A method for removing bacteria and odor from an automobile air conditioning system, comprising the following steps:

[0088] 1) Preparation of nano composite functional material with photocatalytic function:

[0089] 1-1) Disperse 20 parts of nano titanium dioxide, 15 parts of nano zinc oxide, and 15 parts of copper oxide powder in 70 parts of dopamine solution, and add 45 parts of PH buffer solution. React at 200°C to obtain inorganic composite precipitate;

[0090] 1-2) Disperse the precipitate in a 2:1 ratio of ethanol and acetonitrile solution, and add 20 parts of tetraethyl orthosilicate. After reaction at 95°C, corrode it with hydrogen fluoride vapor for 9 hours to obtain a nano composite functional solution with photocatalytic function;

[0091] 1-3) Distill the solution to obtain nano composite functional powder with photocatalytic function;

[0092] 2) Antibacterial and mildew-proof high-efficiency low-resistance air conditioner filter:

[0093] 2-1) The structure of the antibacterial and mildew-proof high-efficiency low-resistance air conditioner filter is two layers, which are an electrostatic stationary filter material layer and an activated carbon paper layer (seeFigure 1 As shown in the figure, both can be fixed together by a plastic frame, and then fixed to the air conditioning system, compared with the filter with traditional carbon cloth design, the structure can reduce the air resistance caused by the active carbon sandwiched in the filter material and then compounded by hot melt glue, thereby reducing the overall filter air resistance;

[0094] 2-2) The electrostatic polar material is composed of a skeleton layer, a melt-blown layer and a primary filter layer (see Figure 2 As shown in the figure, the primary filter layer is impregnated with a nano-composite functional material with photocatalytic function to make the filter have antibacterial and mildew-proof functions.

[0095] The impregnation process is as follows: 5 parts of nano-composite functional solution with photocatalytic function are mixed with 10 parts of chitosan, sorbitol, vanillin, sulfonamide and one or more of o-phenylphenol, and then diluted with 90 parts (volume ratio 1:1) of a mixed solvent of ethanol and deionized water; the primary filter layer is passed through the above functional material solution tank, then squeezed by a roller, and then treated by pre-drying at 100 DEG C for 8 min and post-drying at 140 DEG C for 5 min, finally obtaining a filter material with antibacterial and mildew-proof functions.

[0096] 3) Modification of shell material:

[0097] The shell material of the existing automobile air conditioning system is usually polypropylene material, which is realized by injection molding process, and the shell parts involved include the blower shell, the body shell, the evaporator shell, etc. The shell material modification master batch of the present application is composed of the following raw materials by weight fraction:

[0098] Polypropylene resin: 80 parts, talc: 40 parts, nano-composite functional powder: 10 parts, antioxidant: 0.2 parts, lubricant: 4 parts;

[0099] 4) Modified material for air duct:

[0100] At present, most of the air duct materials for automobile air conditioning are HDPE, and XPE, etc., which are polyethylene materials, and are realized by blow molding process. The air duct material modification master batch of the present application is composed of the following raw materials by weight fraction:

[0101] Polyethylene resin: 80 parts, nano-composite functional powder: 20 parts, antioxidant: 0.2 parts, dispersant: 3 parts, lubricant: 5 parts.

[0102] 5) Evaporator surface modification:

[0103] 45 parts of nano-composite functional solution, 35 parts of silica sol, 35 parts of lithium silicate and 8 parts of silane coupling agent are mixed to form a surface modification liquid, and the evaporator is immersed in the surface modification liquid and baked at 200 DEG C for 5 min to form a 5um thick surface modification coating.

[0104] The automobile air conditioning system of the embodiment is detected to be able to remove VOC, bacteria and mold in the air without excitation of ultraviolet light, and the volatile organic compounds are low-emission under high temperature (65 DEG C), and the odor evaluation method according to VDA270 can reach 3.0 points of 6-level evaluation.

[0105] Example 3

[0106] A bacteria and odor removal method of an automobile air conditioning system, comprising the following steps:

[0107] 1) Preparation of a nano-composite functional material with photocatalytic function:

[0108] 1-1) Disperse 5 parts of nano-titanium dioxide, 3 parts of nano-zinc oxide and 3 parts of copper oxide powder in 40 parts of dopamine solution, and add 20 parts of PH buffer, and fully react at 150 DEG C to obtain inorganic composite precipitate;

[0109] 1-2) Disperse the precipitate in a 2:1 ratio of ethanol and acetonitrile solution, and add 10 parts of tetraethyl orthosilicate, and after the reaction is completed at 85 DEG C, corrode it by hydrogen fluoride vapor for 8.5 hours, and finally obtain a nano-composite functional stock solution with photocatalytic function;

[0110] 1-3) Distill the stock solution to obtain nano-composite functional powder with photocatalytic function;

[0111] 2) Anti-bacterial and anti-mildew high-efficiency low-resistance air conditioner filter:

[0112] 2-1) The anti-bacterial and anti-mildew high-efficiency low-resistance air conditioner filter has a two-layer structure, which is an electrostatic stationary pole filter material layer and an activated carbon paper layer, as shown in FIG. 1, and the two layers can be connected together by a plastic frame, and then installed and fixed in the air conditioning system, compared with the traditional carbon cloth design filter, the structure can reduce the air resistance caused by the activated carbon sandwiched in the filter material and then compounded with hot melt adhesive, thereby reducing the overall filter air resistance; Figure 1

[0113] 2-2) The electrostatic stationary pole material is composed of a skeleton layer, a melt-blown layer and a primary filter layer, and the skeleton layer is impregnated with a nano-composite functional material with photocatalytic function to make the filter have anti-bacterial and anti-mildew functions;

[0114] ​The impregnation treatment process is as follows: 5 parts of nano-composite functional stock solution with photocatalytic function are mixed with 5 parts of chitosan, sorbitol, vanillin, sulfonamide, and one or more of o-phenylphenol, and are diluted with 80 parts (volume ratio 1:1) of a mixed solvent of ethanol and deionized water; after the skeleton layer passes through the functional material tank, it is extruded by a roller, and then is subjected to pre-drying at 80 DEG C for 6 min and post-drying at 120 DEG C for 6 min, and finally a filter material with antibacterial and mildew-proof functions is obtained.

[0115] 3) Shell material modification:

[0116] The shell material of the existing automobile air conditioning system is usually polypropylene material, which is realized by injection molding process, and the shell parts involved include the blower shell, the body shell, the evaporator shell, etc.; the shell material modification master batch of the present application is composed of the following raw materials by weight fraction:

[0117] Polypropylene resin: 55 parts, talcum powder: 15 parts, nano-composite functional powder: 5 parts, antioxidant: 0.2 parts, lubricant: 4 parts;

[0118] 4) Modified material for air duct:

[0119] At present, most of the air duct materials for automobile air conditioners are HDPE, and XPE, which are polyethylene materials, are realized by blow molding process; the air duct material modification master batch of the present application is composed of the following raw materials by weight fraction:

[0120] Polyethylene resin: 60 parts, nano-composite functional powder: 10 parts, antioxidant: 0.1 parts, dispersant: 0.5 parts, lubricant: 1 part.

[0121] 5) Evaporator surface modification:

[0122] 40 parts of nano-composite functional stock solution, 25 parts of silica sol, 25 parts of lithium silicate, and 4 parts of silane coupling agent are mixed to form a surface modification liquid, and the evaporator is immersed in the surface modification liquid and baked at 100 DEG C for 3 min to form a 1 um thick surface modification coating.

[0123] After detection, the automobile air conditioning system after modification in this embodiment can remove VOC, bacteria and mold in the air without the excitation of ultraviolet light, and the volatile organic compounds are low-emission under high temperature conditions (65 DEG C), and the odor evaluation method according to VDA270 can reach 3.0 points of 6-level evaluation.

[0124] The present application is not limited to the above embodiments, and any changes, modifications, substitutions, combinations and simplifications made without departing from the spirit and principles of the present application shall be equivalent replacement methods, and are all included in the protection scope of the present application.

[0125] Obviously, the above embodiments of the present application are merely exemplary and are not intended to limit the embodiments of the present application. Based on the above description, other different forms of changes or variations can be made by those skilled in the art. Here, all the embodiments cannot be enumerated. Any obvious changes or variations derived from the technical solutions of the present application are still within the protection scope of the present application.

Claims

1. A method for removing bacteria and odor from an air conditioning system for an automobile, characterized by comprising the steps of: Comprising the following steps: ​ 1) Preparation of nano-composite functional material with photocatalytic function: 1-1) Disperse 5-20 parts of nano-titanium dioxide, 3-15 parts of nano-zinc oxide, 3-15 parts of copper oxide powder in 40-70 parts of dopamine solution, and add 20-45 parts of pH buffer, and react at 150-200℃ to obtain inorganic composite precipitate; 1-2) Disperse the inorganic composite precipitate in a mixed solution of ethanol and acetonitrile, then add 10-20 parts of tetraethyl orthosilicate, heat to 85-95℃ for reaction, after the reaction is completed, pass hydrogen fluoride vapor to corrode it, to obtain a nano-composite functional stock solution with photocatalytic function; 1-3) Distill the nano-composite functional stock solution until the nano-composite functional powder with photocatalytic function is obtained; 2) Replace the existing filter with an antibacterial and mildew-proof high-efficiency low-resistance air conditioner filter: 2-1) The antibacterial and mildew-proof high-efficiency low-resistance air conditioner filter is composed of an electrostatic stationary filter layer and an activated carbon paper layer stacked on top of each other; 2-2) The electrostatic stationary filter layer is composed of a skeleton layer, a melt-blown layer and a primary filter layer; the skeleton layer or the primary filter layer is impregnated with nano-composite functional material with photocatalytic function to make the filter have antibacterial and mildew-proof function; 3) Modification of air conditioner system shell material: The modification master batch of the air conditioner system shell material is composed of the following raw materials by weight: Polypropylene resin 55-80 parts, talc: 15-40 parts, Nano-composite functional powder: 5-10 parts, antioxidant: 0.1-0.2 parts, Lubricant: 2-4 parts; 4) Modification of air duct material: The modification master batch of the air duct material is composed of the following raw materials by weight: Polyethylene resin: 60-80 parts, nano-composite functional powder: 10-20 parts, Antioxidant: 0.1-0.2 parts, dispersing agent: 0.5-5 parts, lubricant: 1-5 parts; 5) Modification of the surface of the evaporator to form a modified surface coating: Mix 35-45 parts of nano-composite functional stock solution, 25-35 parts of silica sol, 25-35 parts of lithium silicate, and 4-8 parts of silane coupling agent uniformly to form a surface modification liquid, immerse the evaporator in the surface modification liquid, take out the evaporator after immersion, and bake to form a modified surface coating on the surface of the evaporator.

2. The method of claim 1, wherein the method is used for an air conditioning system for a vehicle. In step 1-2), the volume ratio of ethanol to acetonitrile is 1.8-2.2:

1.

3. The method of claim 1, wherein the method is used for an air conditioning system for a vehicle. In step 1-2), the hydrogen fluoride vapor is passed for 8-10 hours to corrode it.

4. The method of claim 1, wherein the method is used for an air conditioning system for a vehicle. In step 2-2), the specific steps of impregnating the skeleton layer or the primary filter layer with nano-composite functional material with photocatalytic function are as follows: mix 5-10 parts of nano-composite functional stock solution with 5-10 parts of one or more of chitosan, sorbitol, vanillin, sulfonamide, and o-phenylphenol, and dilute with 80-90 parts of a mixed solvent of ethanol and deionized water in a volume ratio of 1:1 to obtain a functional material impregnation solution; place the skeleton layer or the primary filter layer in the functional material impregnation solution, take out the skeleton layer or the primary filter layer, and then extrude it through a roller, followed by drying at 80-100℃, and then drying at 120-140℃.

5. The method of claim 4, wherein the method is used for an air conditioning system for a vehicle. The time of placing the skeleton layer or the preliminary filter layer in the functional material impregnating solution is 10-20 minutes.

6. The method of claim 4, wherein the method is used for an air conditioning system for a vehicle. The time of drying at 80-100°C is 5-15 minutes.

7. The method according to claim 4, wherein the method is used for an air conditioning system for a vehicle. The time of drying at 120-140°C is 5-15 minutes.

8. The method of claim 1, wherein the method is used for an air conditioning system for a vehicle. In step 5), the temperature of baking is 100-200°C; the time is 3-5 minutes.

9. The method of claim 1, wherein the method is a method of removing bacteria and odor from an air conditioning system for a vehicle. In step 5), the thickness of the modified surface coating is 1-5um.

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