Antibacterial mildew-proof enhanced AS (acrylonitrile-styrene) plastic as well as manufacturing process and application thereof

Abstract

The invention discloses antibacterial and mildew-proof enhanced AS plastic as well as a manufacturing process and application thereof, and relates to the field of modified plastic. The antibacterial and mildew-proof enhanced AS plastic comprises the following raw materials in parts by weight: 90-110 parts of AS; 31 to 38 parts of glass fiber; 0.3 to 0.6 part of a coupling agent; 0.3 to 0.5 part of an antioxidant; 4-7 parts of a compatilizer; 1 to 1.5 parts of an antibacterial agent; 0.5 to 0.8 part of a mildew preventive; wherein the compatilizer is a styrene-acrylonitrile-maleic anhydride copolymer, and the content of maleic anhydride is 10%-13%; the antibacterial agent is a zinc ion loaded antibacterial agent. The AS plastic material prepared by the invention has antibacterial and mildew-proof functions, and is suitable for use requirements of cross-flow wind wheels of air conditioner indoor units.

Description

Technical Field

[0001] The present invention relates to the field of modified plastics, and in particular to an antibacterial and mildew-proof enhanced AS plastic and a manufacturing process and application thereof. Background Art

[0002] AS plastic is a colorless and transparent thermoplastic resin obtained by using acrylonitrile and styrene as raw materials through suspension or emulsion polymerization. It has high temperature resistance, excellent finish and chemical resistance, as well as excellent hardness, rigidity, dimensional stability and high load-bearing capacity.

[0003] AS plastic can be used to manufacture crossflow impellers, axial flow impellers and other related electrical appliances. However, when the existing crossflow impellers made of AS plastic are used in air conditioner indoor units, they are prone to produce a large number of E. coli, Staphylococcus and mold after long-term use. Mold can easily cause the air conditioner crossflow fan to deform, resulting in reduced fan air volume and increased noise. E. coli, Staphylococcus and mold can also easily cause users to suffer from bronchitis, allergic rhinitis and other diseases.

[0004] Therefore, it is necessary to prepare an AS plastic material with antibacterial and mildew-proof functions. Summary of the invention

[0005] In order to prepare an AS plastic material with antibacterial and mildew-proof functions to meet the use requirements of the crossflow impeller of the indoor unit of an air conditioner, the present application provides an antibacterial and mildew-proof enhanced AS plastic and its manufacturing process and application.

[0006] The present application provides an antibacterial and mildew-proof enhanced AS plastic and its manufacturing process and application using the following technical solutions: An antibacterial and mildew-proof enhanced AS plastic comprises the following raw materials in parts by weight: AS 90-110 copies; Glass fiber 31-38 parts; Coupling agent 0.3-0.6 parts; Antioxidant 0.3-0.5 parts; 4-7 parts of compatibilizer; Antibacterial agent 1-1.5 parts; 0.5-0.8 parts of mildew inhibitor; The compatibilizer is styrene-acrylonitrile-maleic anhydride copolymer, and the content of maleic anhydride is 10%-13%; The antibacterial agent is a zinc ion-carrying antibacterial agent.

[0007] By adopting the above technical solution, glass fiber is added to enhance acrylonitrile-styrene copolymer (AS), improve the rigidity and strength of AS plastic, add compatibilizer and coupling agent containing maleic anhydride to make glass fiber, antibacterial agent and mildewproof agent dispersed evenly in AS, and zinc ion antibacterial agent and mildewproof agent are selected to improve antibacterial property and mildew inhibition ability. Therefore, the AS plastic prepared by the present application has high rigidity, high strength, fatigue resistance and is not easy to deform, and has antibacterial and mildewproof effects, and is suitable for the use requirements of the cross-flow impeller of the indoor unit of the air conditioner.

[0008] Preferably, the zinc ion-carrying antibacterial agent comprises the following raw materials in parts by weight: Zinc chloride 7-13 parts; 65-80 parts of sodium montmorillonite; 10-18 parts of intercalation modifier.

[0009] By adopting the above technical solution, sodium montmorillonite is selected as a carrier, and the sodium montmorillonite is evenly dispersed in AS through a coupling agent. At the same time, the addition of sodium montmorillonite as a filler is beneficial to the strength improvement of AS. Through the cation exchange characteristics of montmorillonite, the modification of montmorillonite by zinc ions and intercalation modifiers is achieved. The prepared antibacterial agent can control the rate of zinc ion release and achieve a long-term antibacterial effect.

[0010] Preferably, the intercalation modifier is one or more of hexadecyl ammonium bromide, dodecyl trimethyl ammonium bromide or dodecyl trimethyl ammonium chloride.

[0011] By adopting the above technical scheme, ammonium salt is selected to modify sodium montmorillonite, and strong electrostatic force and van der Waals force are generated between ammonium cations and the sheets of sodium montmorillonite, so as to improve the affinity and compatibility of the intercalated modified sodium montmorillonite with AS.

[0012] Preferably, the zinc ion-carrying antibacterial agent comprises the following raw materials in parts by weight: 50-65 parts of sodium bentonite; Chitosan 95-120 parts; 2-5 parts of zinc nitrate.

[0013] By adopting the above technical solution, sodium bentonite is modified by chitosan, and chitosan can be stably stored between the sheets of sodium bentonite, and stability is achieved through the relatively strong electrostatic force and van der Waals force between organic cations and sheet silicate sheets. Zinc nitrate is complexed with chitosan by exchanging with sodium ions, so that zinc ions enter the bentonite interlayer. Chitosan has natural antibacterial activity and biocompatibility, and produces a synergistic effect with zinc ions in the antibacterial effect, and the diffusion path is increased through the sheet barrier effect of sodium bentonite, so that the antibacterial agent achieves a sustained release effect, so that the antibacterial agent has good antibacterial and durability.

[0014] Preferably, the antifungal agent is a mixture of nano-titanium dioxide modified chitosan and a heterocyclic compound in a weight ratio of (0.4-0.7):1, wherein the nano-titanium dioxide modified chitosan is prepared by the following method: Add 2-5 parts of chitosan and 1-2 parts of nano titanium dioxide to the reaction device, then add 40-55 parts of deionized water, 15-20 parts of 10% acetic acid, and 5-8 parts of epichlorohydrin, stir evenly, and evenly oscillate with ultrasound for 10-20 minutes. Add the solid to a centrifuge for separation, wash it repeatedly with deionized water, dry it at 60-70°C for 6-8 hours, grind and sieve it to obtain nano titanium dioxide modified chitosan.

[0015] By adopting the above technical solution, chitosan is used as a natural antibacterial compound, and nano-titanium dioxide is used as a non-dissolving inorganic antibacterial agent. The combined nano-titanium dioxide modified chitosan has good anti-mildew and antibacterial effects, and has a good comprehensive effect after mixing with heterocyclic compounds. At the same time, nano-titanium dioxide can act as a partial filler, which is beneficial to improve the processing performance of AS.

[0016] Preferably, the heterocyclic compound is selected from one or more of N-trichloromethylthiophthalimide, 1,2-benzisothiazolin-3-one, octylisothiazolinone, and 2-hydroxy-1,4-naphthoquinone.

[0017] By adopting the above technical scheme, when the hybrid compound as an organic mildew inhibitor comes into contact with microorganisms, it can fuse with the cell membrane, and through the action on the structural substances such as organelles, proteins, nucleic acids, etc., the cell contents, enzymes, proteins, nucleic acids are damaged, and the reproduction of mold is inhibited to achieve the purpose of sterilization and mildew prevention.

[0018] Preferably, the coupling agent is γ-aminopropyltriethoxysilane.

[0019] Preferably, the antioxidant is one or more of antioxidant 168, antioxidant 1010, and antioxidant 1076.

[0020] By adopting the above technical solution, the use of antioxidants can prevent the AS system from being oxidized during the melt blending process.

[0021] The present application also discloses a manufacturing process of an antibacterial and mildew-proof enhanced AS plastic, comprising the following steps: Add AS, coupling agent, antioxidant, compatibilizer, antibacterial agent and mildewproof agent into a high-speed mixer and mix at high speed for 10-20 minutes to obtain a uniformly mixed blend; The blend is added into a twin-screw extruder, and the glass fiber is added into the twin-screw extruder from the side, and melt-blended and extruded. The screw speed of the twin-screw extruder is 350-400r / min, and the extrusion temperature is 200-235°C; After extrusion, water cooling, drying and granulation, the antibacterial and mildew-proof enhanced AS plastic is obtained.

[0022] By adopting the above technical solution and reasonably matching the components, the AS plastic is granulated through a twin-screw mixing and co-extrusion process, so that the AS plastic has high strength and rigidity, and also has antibacterial and mildew-proof properties.

[0023] The present application also discloses the use of an antibacterial and mildew-proof enhanced AS plastic as a crossflow impeller material for an indoor unit of an air conditioner.

[0024] In summary, this application has the following beneficial effects: 1. Adding glass fiber to acrylonitrile-styrene copolymer (AS) enhances the rigidity and strength of AS plastic, adding compatibilizer and coupling agent containing maleic anhydride makes glass fiber, antibacterial agent and mildewproof agent dispersed evenly in AS, and using zinc ion antibacterial agent and mildewproof agent to enhance antibacterial property and mildew inhibition ability. Therefore, the AS plastic prepared in this application has high rigidity, high strength, fatigue resistance and is not easy to deform, and has antibacterial and mildewproof effects, and is suitable for the use requirements of the cross-flow impeller of the indoor unit of the air conditioner.

[0025] 2. Chitosan is a natural antibacterial compound, and nano-titanium dioxide is a non-dissolving inorganic antibacterial agent. The combined nano-titanium dioxide modified chitosan has good anti-mildew and antibacterial effects, and the combined effect is good after mixing with heterocyclic compounds. At the same time, nano-titanium dioxide can act as a partial filler, which is beneficial to improve the processing performance of AS. DETAILED DESCRIPTION

[0026] The present application is further described in detail below in conjunction with Examples 1-6.

[0027] AS (acrylonitrile-styrene copolymer) was purchased from Dongguan Zhanyu Plastic Raw Materials Co., Ltd., brand PN-128L150; The compatibilizer was purchased from Dongguan Dingxin Plastic Raw Materials Co., Ltd., brand name Huawen SMA-800, maleic anhydride content 10%; The glass fiber is alkali-free chopped glass fiber.

[0028] Preparation Example 1 An antibacterial agent comprising the following raw materials: Zinc chloride 7g; Sodium montmorillonite 65g; 10 g of intercalation modifier, specifically hexadecyl ammonium bromide.

[0029] The antimicrobial agent is prepared by the following method: 65g of sodium montmorillonite was added to 580g of deionized water to prepare a suspension, 7g of zinc chloride was added, the temperature was raised to 65°C and stirred for 4h, 10g of intercalation modifier was added, the temperature was further raised to 72°C and stirred for 5h. The product was filtered, washed repeatedly with deionized water, placed in a vacuum oven at 60°C and vacuum dried for 48h, ground and sieved through a 300-mesh sieve to obtain an antibacterial agent.

[0030] Preparation Example 2 An antibacterial agent comprising the following raw materials: Zinc chloride 13g; Sodium montmorillonite 80g; 18 g of intercalation modifier, specifically dodecyltrimethylammonium bromide.

[0031] The antimicrobial agent is prepared by the following method: 80g of sodium montmorillonite was added to 700g of deionized water to prepare a suspension, 13g of zinc chloride was added, the temperature was raised to 68°C and stirred for 5h, 18g of intercalation modifier was added, the temperature was further raised to 80°C and stirred for 5.5h. The product was filtered, washed repeatedly with deionized water, placed in a vacuum oven at 63°C and vacuum dried for 48h, ground and sieved through a 300-mesh sieve to obtain an antibacterial agent.

[0032] Preparation Example 3 An antibacterial agent comprising the following raw materials: Zinc chloride 9g; Sodium montmorillonite 73g; 14 g of intercalation modifier, specifically dodecyltrimethylammonium chloride.

[0033] The antimicrobial agent is prepared by the following method: 73g of sodium montmorillonite was added to 650g of deionized water to prepare a suspension, 9g of zinc chloride was added, the temperature was raised to 70°C and stirred for 4h, 14g of intercalation modifier was added, the temperature was further raised to 75°C and stirred for 5h. The product was filtered, washed repeatedly with deionized water, placed in a vacuum oven at 60°C and vacuum dried for 48h, ground and sieved through a 300-mesh sieve to obtain an antibacterial agent.

[0034] Preparation Example 4 An antibacterial agent comprising the following raw materials: Sodium bentonite 50g; Chitosan 95g; Zinc nitrate 2g.

[0035] The antimicrobial agent is prepared by the following method: 50g of sodium bentonite was added to 430g of deionized water, and the temperature was raised to 60°C for ultrasonic dispersion for 1h to form a mixed solution. 95g of chitosan was dissolved in 2% acetic acid solution and stirred for 5min to fully dissolve the chitosan to form a chitosan solution. The chitosan solution was slowly dripped into the mixed solution at 60°C, the pH was adjusted to 5 with sodium hydroxide, and the reaction was carried out at a constant temperature for 10 hours; the product was washed with deionized water several times until it was neutral, and then dried in an oven at 50°C after centrifugation; The obtained product was added with water to form a slurry, and 2 g of zinc nitrate was added to the slurry. The mixture was placed in a constant temperature water bath at 65° C. and stirred for reaction for 4 h. The product was washed with deionized water, dried in a drying oven at 50° C., ground and sieved to obtain an antibacterial agent.

[0036] Preparation Example 5 An antibacterial agent comprising the following raw materials: Sodium bentonite 65g; Chitosan 120g; Zinc nitrate 5g.

[0037] The antimicrobial agent is prepared by the following method: 65g of sodium bentonite was added to 580g of deionized water, and the mixture was heated to 62°C and ultrasonically dispersed for 1h to form a mixed solution. 120g of chitosan was dissolved in 2% acetic acid solution and stirred for 8min to fully dissolve the chitosan to form a chitosan solution. The chitosan solution was slowly dripped into the mixed solution at 62°C, the pH was adjusted to 5 with sodium hydroxide, and the reaction was carried out at a constant temperature for 10 hours; the product was washed with deionized water several times until it was neutral, and then dried in an oven at 50°C after centrifugation; The obtained product was added with water to form a slurry, and 5 g of zinc nitrate was added to the slurry. The mixture was placed in a constant temperature water bath at 65° C. and stirred for reaction for 5 h. The product was washed with deionized water, dried in a drying oven at 55° C., ground and sieved to obtain an antibacterial agent. Example

[0038] Example 1 An antibacterial and mildew-proof enhanced AS plastic, comprising the following raw materials: AS (acrylonitrile-styrene copolymer) 90kg; Glass fiber 31kg; 0.3 kg of coupling agent, γ-aminopropyltriethoxysilane; Antioxidant 0.3kg, antioxidant 168 is selected; Compatibilizer 4kg; 1 kg of antibacterial agent, the antibacterial agent prepared in Preparation Example 1 is selected; 0.5kg of mildew inhibitor, N-trichloromethylthiophthalimide is selected.

[0039] The manufacturing process of antibacterial and anti-mildew enhanced AS plastic includes the following steps: Add AS, coupling agent, antioxidant, compatibilizer, antibacterial agent and mildewproof agent into a high-speed mixer and mix at high speed for 10 minutes to obtain a uniformly mixed blend; The blended material is added into a twin-screw extruder, and the glass fiber is added into the twin-screw extruder from the side to melt-blend and extrude; After extrusion, water cooling, drying and granulation, the antibacterial and mildew-proof enhanced AS plastic is obtained.

[0040] The specific process parameters of the twin-screw extruder are as follows: Body position Zone 1 Zone 2 Zone 3 Zone 4 Zone 5 Zone 6 District 7 District 8 District 9 Machine head Extrusion temperature / ℃ 190 200 200 200 225 225 225 220 220 235 Other parameters of the extruder include: main machine speed is 350r / min, main machine current is 180A, main machine feeding speed is 32r / min, vacuum pressure is ≥0.06MPa, and main machine frequency of the side fiber feeding machine is 2Hz.

[0041] Example 2 An antibacterial and mildew-proof enhanced AS plastic, comprising the following raw materials: AS (acrylonitrile-styrene copolymer) 110kg; Glass fiber 38kg; 0.6 kg of coupling agent, γ-aminopropyltriethoxysilane; Antioxidant 0.5kg, antioxidant 1010 is selected; Compatibilizer 7kg; 1.5 kg of antibacterial agent, the antibacterial agent prepared in Preparation Example 2 is selected; 0.8 kg of antifungal agent, 0.23 kg of nano titanium dioxide modified chitosan and 0.57 kg of 1,2-benzisothiazolin-3-one were selected.

[0042] Nano-titanium dioxide modified chitosan was prepared by the following method: Add 2 parts of chitosan and 1 part of nano-titanium dioxide to the reaction device, then add 40 parts of deionized water, 15 parts of 10% acetic acid, and 5 parts of epichlorohydrin, stir evenly, and oscillate evenly with ultrasound for 10 minutes. Add the solid to a centrifuge for separation, wash it repeatedly with deionized water, dry it at 60°C for 6 hours, grind and sieve it to obtain nano-titanium dioxide modified chitosan.

[0043] The manufacturing process of antibacterial and anti-mildew enhanced AS plastic includes the following steps: Add AS, coupling agent, antioxidant, compatibilizer, antibacterial agent and mildewproof agent into a high-speed mixer and mix at high speed for 20 minutes to obtain a uniformly mixed blend; The blended material is added into a twin-screw extruder, and the glass fiber is added into the twin-screw extruder from the side to perform melt blending and extrusion; After extrusion, water cooling, drying and granulation, the antibacterial and mildew-proof enhanced AS plastic is obtained.

[0044] The specific process parameters of the twin-screw extruder are as follows: Body position Zone 1 Zone 2 Zone 3 Zone 4 Zone 5 Zone 6 District 7 District 8 District 9 Machine head Extrusion temperature / ℃ 190 200 200 200 225 225 225 220 220 235 Other parameters of the extruder include: main engine speed is 400r / min, main engine current is 220A, main engine feeding speed is 40r / min, vacuum pressure is ≥0.06MPa, and main engine frequency of the side fiber feeding machine is 6Hz.

[0045] Example 3 An antibacterial and mildew-proof enhanced AS plastic, comprising the following raw materials: AS (acrylonitrile-styrene copolymer) 100kg; Glass fiber 34kg; 0.5 kg of coupling agent, γ-aminopropyltriethoxysilane; 0.4kg antioxidant, 0.1kg antioxidant 1010 and 0.3kg 1076; Compatibilizer 6kg; 1.2 kg of antibacterial agent, the antibacterial agent prepared in Preparation Example 3 is selected; 0.7kg of mildew inhibitor, 0.28kg of nano-titanium dioxide modified chitosan and 0.42kg of 2-hydroxy-1,4 naphthoquinone were selected.

[0046] Nano-titanium dioxide modified chitosan was prepared by the following method: Add 5 parts of chitosan and 2 parts of nano-titanium dioxide to the reaction device, then add 55 parts of deionized water, 20 parts of 10% acetic acid, and 8 parts of epichlorohydrin, stir evenly, and oscillate evenly with ultrasound for 20 minutes. Add the solid to a centrifuge for separation, wash it repeatedly with deionized water, dry it at 70°C for 8 hours, grind and sieve it to obtain nano-titanium dioxide modified chitosan.

[0047] The manufacturing process of antibacterial and anti-mildew enhanced AS plastic includes the following steps: Add AS, coupling agent, antioxidant, compatibilizer, antibacterial agent and mildewproof agent into a high-speed mixer and mix at high speed for 15 minutes to obtain a uniformly mixed blend; The blended material is added into a twin-screw extruder, and the glass fiber is added into the twin-screw extruder from the side to perform melt blending and extrusion; After extrusion, water cooling, drying and granulation, the antibacterial and mildew-proof enhanced AS plastic is obtained.

[0048] The specific process parameters of the twin-screw extruder are as follows: Body position Zone 1 Zone 2 Zone 3 Zone 4 Zone 5 Zone 6 District 7 District 8 District 9 Machine head Extrusion temperature / ℃ 190 200 200 200 225 225 225 220 220 235 Other parameters of the extruder include: main engine speed of 380r / min, main engine current of 200A, main engine feeding speed of 36r / min, vacuum pressure ≥0.06MPa, and main engine frequency of the side fiber feeding machine of 4Hz.

[0049] Example 4 The difference between this embodiment and embodiment 1 is that in this embodiment, the antibacterial agent is the antibacterial agent prepared in embodiment 4.

[0050] Example 5 The difference between this embodiment and embodiment 2 is that in this embodiment, the antibacterial agent is the antibacterial agent prepared in embodiment 4.

[0051] Example 6 The difference between this embodiment and embodiment 3 is that in this embodiment, the antibacterial agent is the antibacterial agent prepared in embodiment 5.

[0052] Performance Test: The AS plastics of Examples 1-6 prepared by the above manufacturing process were tested. The test item set standards are shown in Table 1, and the test results are recorded in Table 2.

[0053] Table 1 Test items and standards project standard Test conditions Standard value unit Tensile Strength GB / T 1040 Breaking point 50mm / min ≥110 MPa Bending Strength GB / T 9341 Span 64 mm 2 mm / min ≥145 MPa Impact strength GB / T 1843 2.75J pendulum ≥6 KJ / m2 Heat Deflection Temperature GB / T 1634 / ≥98 ℃ Ash GB / T 9345 / 30±1.5 % Escherichia coli GB / T 31402 24-hour antibacterial rate / % Staphylococcus aureus GB / T 31402 24-hour antibacterial rate / % Table 2 project Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Tensile Strength 114.5 117.4 116.7 118.9 120.7 122.2 Bending Strength 155.8 161.3 158.2 163.4 168.72 170.4 Impact strength 6.8 6.82 6.9 6.95 7.1 6.85 Heat Deflection Temperature 101 101 102 101 101 102 Ash 30.43 30.56 29.83 30.27 31.06 30.48 Escherichia coli 97.8 98.6 98.7 99.2 99.9 99.9 Staphylococcus aureus 98.3 99.2 99.2 99.6 99.9 99.9 According to the above table, the tensile strength, bending strength and impact strength of the AS plastic material prepared in the present application all meet the standard requirements. By adding glass fiber reinforcement and other raw materials, the AS plastic has high rigidity and high strength; the heat deformation temperature is greater than 98°C, indicating that the AS plastic material has good heat resistance and a wider range of uses; the antibacterial and mildew-proof properties of the AS plastic are verified by the tests of Escherichia coli and Staphylococcus aureus, proving that the AS plastic prepared in the present application has good antibacterial and mildew-proof properties.

[0054] The AS plastic material prepared in the present application is suitable for application to all air-conditioning crossflow fan blades, axial flow fan blades and related household appliances. The present application discloses the application of antibacterial and mildew-proof enhanced AS plastic as a crossflow fan wheel material for an indoor unit of an air conditioner.

[0055] The applicant also conducted a dissolution and antibacterial test on the crossflow impeller AS + glass fiber antibacterial and mildew-proof project in accordance with GB21551.1-2008 "General Rules for Antibacterial, Sterilization and Purification Functions of Household and Similar Electrical Appliances", and the test results met the standard requirements.

[0056] This specific implementation manner is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make non-creative modifications to the specific implementation manner as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. An antibacterial and mildew-proof enhanced AS plastic, characterized by: The invention comprises the following raw materials in parts by weight: AS 90-110 copies; Glass fiber 31-38 parts; Coupling agent 0.3-0.6 parts; Antioxidant 0.3-0.5 parts; 4-7 parts of compatibilizer; Antibacterial agent 1-1.5 parts; 0.5-0.8 parts of mildew inhibitor; The compatibilizer is styrene-acrylonitrile-maleic anhydride copolymer, and the content of maleic anhydride is 10%-13%; The antibacterial agent is a zinc ion-carrying antibacterial agent.

2. The antibacterial and mildew-proof enhanced AS plastic according to claim 1, characterized in that: The zinc ion-carrying antibacterial agent comprises the following raw materials in parts by weight: Zinc chloride 7-13 parts; 65-80 parts of sodium montmorillonite; Intercalation modifier 10-18 parts.

3. The antibacterial and mildew-proof enhanced AS plastic according to claim 2, characterized in that: The intercalation modifier is selected from one or more of hexadecyl ammonium bromide, dodecyl trimethyl ammonium bromide or dodecyl trimethyl ammonium chloride.

4. The antibacterial and mildew-proof enhanced AS plastic according to claim 1, characterized in that: The zinc ion-carrying antibacterial agent comprises the following raw materials in parts by weight: 50-65 parts of sodium bentonite; Chitosan 95-120 parts; 2-5 parts of zinc nitrate.

5. The antibacterial and mildew-proof enhanced AS plastic according to claim 1, characterized in that: The antifungal agent is a mixture of nano-titanium dioxide modified chitosan and a heterocyclic compound in a weight ratio of (0.4-0.7):1, wherein the nano-titanium dioxide modified chitosan is prepared by the following method: Add 2-5 parts of chitosan and 1-2 parts of nano titanium dioxide to the reaction device, then add 40-55 parts of deionized water, 15-20 parts of 10% acetic acid, and 5-8 parts of epichlorohydrin, stir evenly, and evenly oscillate with ultrasound for 10-20 minutes. Add the solid to a centrifuge for separation, wash it repeatedly with deionized water, dry it at 60-70°C for 6-8 hours, grind and sieve it to obtain nano titanium dioxide modified chitosan.

6. The antibacterial and mildew-proof enhanced AS plastic according to claim 5, characterized in that: The heterocyclic compound is selected from one or more of N-trichloromethylthiophthalimide, 1,2-benzisothiazolin-3-one, octylisothiazolinone, and 2-hydroxy-1,4-naphthoquinone.

7. The antibacterial and mildew-proof enhanced AS plastic according to claim 1, characterized in that: The coupling agent is γ-aminopropyltriethoxysilane.

8. The antibacterial and mildew-proof enhanced AS plastic according to claim 1, characterized in that: The antioxidant is selected from one or more of antioxidant 168, antioxidant 1010, and antioxidant 1076.

9. A process for manufacturing the antibacterial and mildew-proof enhanced AS plastic according to any one of claims 1 to 8, characterized in that: The following steps are involved: Add AS, coupling agent, antioxidant, compatibilizer, antibacterial agent and mildewproof agent into a high-speed mixer and mix at high speed for 10-20 minutes to obtain a uniformly mixed blend; The blend is added into a twin-screw extruder, and the glass fiber is added into the twin-screw extruder from the side, and melt-blended and extruded. The screw speed of the twin-screw extruder is 350-400r / min, and the extrusion temperature is 200-235°C; After extrusion, water cooling, drying and granulation, the antibacterial and mildew-proof enhanced AS plastic is obtained.

10. Use of the antibacterial and mildew-proof enhanced AS plastic according to any one of claims 1 to 8 as a crossflow impeller material for an indoor unit of an air conditioner.