Polypropylene mildew-proof material as well as preparation method and application thereof

Abstract

The invention discloses a polypropylene mildew-proof material as well as a preparation method and application thereof, and the polypropylene mildew-proof material comprises the following components in parts by weight: 30-80 parts of polypropylene resin, 0.1-5 parts of a mildew-proof agent, 2-25 parts of a mildew-proof auxiliary agent, 0.1-45 parts of an inorganic filler and 1-10 parts of a compatilizer, wherein the mildew-proof auxiliary agent contains linear low-density polyethylene, a styrene copolymer and an ethylene copolymer in a weight ratio of 1: (0.1-1): (0.1-1). According to the polypropylene mildew-proof material disclosed by the invention, the mildew-proof agent auxiliary agent formed by compounding the linear low-density polyethylene, the styrene copolymer and the ethylene copolymer in a specific dosage ratio is selected to help the mildew-proof agent to be effectively fused and dispersed in the polypropylene material, and precipitation and volatilization of the mildew-proof agent are reduced, so that the emission performance of the polypropylene mildew-proof material is reduced; the mildew-proof effect of the polypropylene mildew-proof material is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of polymer materials, and more specifically to a polypropylene mildew-proof material and a preparation method and application thereof. Background Art

[0002] Polypropylene (PP) has the advantages of low density, easy processing, and excellent mechanical properties. It has been widely used in the automotive industry, home appliances and machinery. In the automotive industry, polypropylene is mainly used in automotive interior and exterior parts, interior parts such as dashboards, door panels and pillars, and exterior parts such as bumpers, fenders, and deflectors. It is worth noting that compared with exterior parts, interior parts are rarely rinsed thoroughly with water throughout their life cycle, and the interior parts are closed in the passenger compartment when the car is stopped or the air conditioner is turned on during use. Therefore, bacteria and mold caused by smoke, sweat, sneezing, or kitchen waste microorganisms are more likely to adhere to and remain on the automotive interior parts. With the increasing awareness of environmental protection year by year, antibacterial and mildew-proof polypropylene technology is also being promoted in the field of automotive interior parts. Antibacterial and mildew-proof polypropylene materials are transitioning from the first generation (self-antibacterial) to the second generation (antibacterial), and the research and development of the third generation (mildew-proof) has begun.

[0003] In order to improve the mildew resistance of polypropylene materials, people have conducted a lot of research, especially in the development and selection of low-emission polypropylene for interior parts, as well as the mechanism and performance of mildew inhibitors, and have obtained good antibacterial and mildew resistance. However, when mildew inhibitors are directly introduced into polypropylene materials, not only the original emission performance (atomization value, odor level, TVOC content) of polypropylene materials themselves is greatly affected, but also the mildew resistance of polypropylene materials is poor.

[0004] Therefore, it is of great economic value to develop a polypropylene mildew-proof material with lower emission performance (atomization value, odor level, TVOC content) and stronger mildew-proof effect. Summary of the invention

[0005] The purpose of the present invention is to solve the deficiencies of the prior art and to provide a polypropylene mildew-proof material and a preparation method and application thereof.

[0006] To achieve the above object, the technical solution adopted by the present invention is:

[0007] In a first aspect, the present invention provides a polypropylene mildew-proof material, which comprises the following components by weight:

[0008] 30-80 parts of polypropylene resin, 0.1-5 parts of mildewproof agent, 2-25 parts of mildewproof auxiliary agent, 0.1-45 parts of inorganic filler, 1-10 parts of compatibilizer;

[0009] in:

[0010] The anti-mildew auxiliary agent contains linear low-density polyethylene (LLDPE), styrene copolymer and ethylene copolymer in a weight ratio of 1:(0.1-1):(0.1-1).

[0011] The polypropylene mildew-proof material of the present invention uses a mildew-proof agent auxiliary agent formed by compounding linear low-density polyethylene, styrene copolymer and ethylene copolymer in a specific dosage ratio to help the mildew-proof agent to be effectively integrated and dispersed in the polypropylene material, reduce the precipitation and volatilization of the mildew-proof agent, thereby reducing the emission performance of the polypropylene mildew-proof material and improving the mildew-proof effect of the polypropylene mildew-proof material.

[0012] In the present invention, the emission performance is reflected by the test results of atomization value, odor level, and TVOC content. When the test results of atomization value, odor level, and TVOC content of the polypropylene mildew-proof material are lower, it means that the emission performance of the polypropylene mildew-proof material is also lower.

[0013] Preferably, the weight content of styrene in the styrene copolymer (St% content) is 20-80%.

[0014] More preferably, the weight content of styrene in the styrene copolymer (St% content) is 30-60%.

[0015] More preferably, the styrene copolymer is at least one of acrylonitrile-styrene copolymer, acrylonitrile-butadiene-styrene copolymer and hydrogenated styrene-butadiene block copolymer.

[0016] Preferably, the weight content of ethylene in the ethylene copolymer is 60-90%.

[0017] More preferably, the ethylene copolymer is at least one of ethylene-butene copolymer and ethylene-octene copolymer.

[0018] Preferably, the weight ratio of the linear low-density polyethylene (LDPE), the styrene copolymer and the ethylene copolymer is 1:0.1:0.1, 1:0.1:0.2, 1:0.1:0.5, 1:0.1:0.7, 1:0.1:1, 1:0.2:0.1, 1:0.2:0.2, 1:0.2:0.5, 1:0.2:0.7, 1:0.2:1, 1:0.5: The range value of one or any two of 0.1, 1:0.5:0.2, 1:0.5:0.5, 1:0.5:0.7, 1:0.5:1, 1:0.7:0.1, 1:0.7:0.2, 1:0.7:0.5, 1:0.7:0.7, 1:0.7:1, 1:1:0.1, 1:1:0.2, 1:1:0.5, 1:1:0.7, 1:1:1.

[0019] Preferably, the mildew preventer is at least one of a zinc ion-containing mildew preventer, a silver ion-containing mildew preventer, an organic chloride, zinc oxide, ammonium sulfate, and calcium phosphate.

[0020] More preferably, the zinc ion-containing mildew inhibitor is zinc pyrithione; for example, zinc pyrithione can be produced by Microban in the United States.

[0021] More preferably, the organic chloride is triclosan (CAS No.: 3380-34-5); for example, triclosan may be B1000 produced by BASF of Germany.

[0022] In addition, the zinc oxide may be ZM-X15F produced by Zhejiang Zheming.

[0023] Preferably, the mesh size of the inorganic filler is 100-5000 mesh.

[0024] Preferably, the inorganic filler is a mixture of talc and filler A, and the filler A is at least one of mica and calcium carbonate.

[0025] More preferably, the inorganic filler is talc powder and filler A in a weight ratio of 1:(0.1-1).

[0026] The present invention can drive the mildew-proof agent in the process of preparing the polypropylene mildew-proof material by selecting talcum powder and filler A in a specific dosage ratio, further promote the fusion and dispersion of the mildew-proof agent in the polypropylene material, and also hinder the precipitation and volatilization of the mildew-proof agent, thereby further reducing the emission performance of the polypropylene mildew-proof material and improving the mildew-proof effect of the polypropylene mildew-proof material.

[0027] More preferably, the weight ratio of the talc powder to the filler A is in the range of one or any two of 1:0.1, 1:0.4, 1:0.5, 1:0.7, 1:1.

[0028] More preferably, the mesh size of the talc is 800-3000 mesh.

[0029] In the preparation process of the polypropylene mildew-proof material of the present invention, talcum powder with different mesh sizes has different abilities in driving the mildew-proof agent together with filler A, and in hindering the precipitation and volatilization of the mildew-proof agent. When the mesh size of talcum powder is 800-3000 mesh, it can better drive the mildew-proof agent together with filler A, and hinder the precipitation and volatilization of the mildew-proof agent, which is more conducive to further reducing the emission performance of the polypropylene mildew-proof material and improving the mildew-proof effect of the polypropylene mildew-proof material.

[0030] More preferably, the mesh size of the talc is one or any two of 800 mesh, 1250 mesh, 2000 mesh, 2500 mesh, and 3000 mesh.

[0031] More preferably, the mesh size of the mica is 500-800 meshes.

[0032] More preferably, the mesh size of the calcium carbonate is 2000-4000 mesh.

[0033] In the present invention, the commonly used polypropylene resins in the art can be used in the present invention.

[0034] Preferably, the weight percentage of the polypropylene resin in the polypropylene mildew-proof material is ≥ 50.0%.

[0035] More preferably, the weight percentage of the polypropylene resin in the polypropylene mildew-proof material is ≥ 54.0%.

[0036] Preferably, the compatibilizer is a polyolefin graft, and the polyolefin graft is at least one of maleic anhydride grafted polyethylene (PP-g-MAH) and maleic anhydride grafted POE.

[0037] Preferably, in the polypropylene mildew-proof material, the weight percentage of the polypropylene resin is 35 parts, 40 parts, 45 parts, 50 parts, 55 parts, 60 parts, 65 parts, 70 parts, 75 parts or any two of the range values; the weight percentage of the mildew-proof agent is 1 part, 1.5 parts, 2 parts, 2.5 parts, 3 parts or any two of the range values; the weight percentage of the mildew-proof auxiliary agent is 4 parts, 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, 10 parts, 11 parts, 12 parts, 13 parts, 14 parts, 15 parts, 16 parts, 17 parts, 18 parts, 19 parts , 20 parts or any two of the range values; the weight proportion of inorganic filler is 2 parts, 4 parts, 5 parts, 6 parts, 8 parts, 10 parts, 12 parts, 14 parts, 15 parts, 16 parts, 18 parts, 20 parts, 22 parts, 24 parts, 25 parts, 26 parts, 28 parts, 30 parts, 32 parts, 34 parts, 35 parts, 36 parts, 38 parts, 40 parts, 42 parts or any two of the range values; the weight proportion of compatibilizer is 2 parts, 2.5 parts, 3 parts, 3. parts, 4 parts, 4.5 parts, 5 parts or any two of the range values.

[0038] Preferably, the polypropylene mildew-proof material comprises the following components, calculated by weight:

[0039] 35-75 parts of polypropylene resin, 1-3 parts of mildewproof agent, 4-20 parts of mildewproof auxiliary agent, 2-42 parts of inorganic filler, and 2-5 parts of compatibilizer.

[0040] Preferably, the polypropylene mildew-proof material further comprises an auxiliary agent, and the auxiliary agent is at least one of an antioxidant, a light stabilizer, and a lubricant.

[0041] More preferably, the weight portion of the auxiliary agent is 0.2-2 parts.

[0042] More preferably, the antioxidant is at least one of a hindered phenol antioxidant and a phosphite antioxidant; the hindered phenol antioxidant is at least one of antioxidant 1010, antioxidant 1076, and antioxidant 330; the phosphite antioxidant is at least one of antioxidant 168, antioxidant 3010, and trisphenol A phosphite.

[0043] More preferably, the light stabilizer is a hindered amine light stabilizer; the hindered amine light stabilizers commonly used in the art can be used in the present invention, such as Tinuvin 622, Tinuvin 770DF, Chimassorb 944, and the like.

[0044] More preferably, the lubricant is a metal stearate compound; the metal stearate compound is at least one of zinc stearate and calcium stearate.

[0045] In a second aspect, the present invention provides a method for preparing a polypropylene mildew-proof material, comprising the following steps:

[0046] The components are mixed, extruded and granulated to obtain the polypropylene mildew-proof material.

[0047] Preferably, the temperature of the extrusion granulation is 180-260°C.

[0048] In a third aspect, the present invention provides a mildew-proof article, which is prepared using the polypropylene mildew-proof material described in the first aspect.

[0049] In a fourth aspect, the present invention provides an application of a polypropylene mildew-proof material in automobile interior decoration parts.

[0050] Compared with the prior art, the present invention has the following beneficial effects:

[0051] The polypropylene mildew-proof material of the present invention uses a mildew-proof agent auxiliary agent formed by compounding linear low-density polyethylene, styrene copolymer and ethylene copolymer in a specific dosage ratio to help the mildew-proof agent to be effectively integrated and dispersed in the polypropylene material, reduce the precipitation and volatilization of the mildew-proof agent, thereby reducing the emission performance of the polypropylene mildew-proof material and improving the mildew-proof effect of the polypropylene mildew-proof material.

[0052] In addition, the present invention can drive the mildew-proof agent in the process of preparing the polypropylene mildew-proof material by selecting talc powder and mica in a specific dosage ratio, further promote the fusion and dispersion of the mildew-proof agent in the polypropylene material, and also hinder the precipitation and volatilization of the mildew-proof agent, thereby further reducing the emission performance of the polypropylene mildew-proof material and improving the mildew-proof effect of the polypropylene mildew-proof material. DETAILED DESCRIPTION

[0053] In order to better illustrate the purpose, technical solutions and advantages of the present invention, the present invention will be further described below in conjunction with specific embodiments.

[0054] In each embodiment and comparative example of the present invention, the use of reagents is as follows:

[0055] Linear low-density polyethylene (LLDPE), DFDA-7042N, Lanzhou Petrochemical;

[0056] High-density polyethylene (HDPE), DMDA-8008, Dushanzi Petrochemical;

[0057] Styrene copolymer-1, hydrogenated styrene-butadiene block copolymer (SEBS), S6552, St% content (weight content of styrene) 30%, Zhejiang Zhongli Synthetic Materials Technology Co., Ltd.;

[0058] Styrene copolymer-2, acrylonitrile-butadiene-styrene copolymer, 720GS, St% content (weight content of styrene) 60%, Dow, USA;

[0059] Ethylene copolymer, ethylene-butene copolymer, POE 7447, ethylene content 70% by weight, Dow, USA;

[0060] Antifungal agent-1, Antifungal agent containing zinc ions, Zinc pyrithione, Microban, USA;

[0061] Antifungal agent-2, organic chloride, triclosan (CAS No.: 3380-34-5), B1000, BASF, Germany;

[0062] Antifungal agent-3, zinc oxide, nano zinc oxide, ZM-X15F, Zhejiang Zheming;

[0063] Talc-1, TYT-8875B, Liaoning Haicheng Tianyuan Chemical Co., Ltd., mesh number is 1250 mesh;

[0064] Talc-2, JLD-H800, Jinlinda, mesh size is 800 mesh;

[0065] Talc-3, TY90-7-C, Dongguan Sanzhi New Material Technology Co., Ltd., mesh number is 2000 mesh;

[0066] Talc-4, TYT-777A, Liaoning Haicheng Tianyuan Chemical Co., Ltd., mesh size is 3000 mesh;

[0067] Mica, YM-SW500, Suzhou Shenwei Non-metallic Materials Co., Ltd., mesh number is 800 mesh;

[0068] Calcium carbonate, AC-05N, Guangdong Xianglong Technology Co., Ltd., mesh size 4000;

[0069] Compatibilizer, maleic anhydride grafted polypropylene (PP-g-MAH), commercially available;

[0070] Polypropylene resin, PP EP548R, Sinopec Tianjin;

[0071] The antioxidant was a hindered phenol antioxidant, antioxidant 1010, commercially available;

[0072] The light stabilizer was a hindered amine light stabilizer, Tinuvin 622, from BASF, Germany;

[0073] The lubricant is a metal stearate compound, calcium stearate, which is commercially available.

[0074] Examples 1-18 and Comparative Examples 1-10

[0075] Examples 1-18 and Comparative Examples 1-10 provide different polypropylene mildew-proof materials, the only difference between them is that the types and amounts of the components are different. Calculated by weight, Examples 1-18 and Comparative Examples 1-10 include the components shown in Table 1;

[0076] The preparation method of the polypropylene mildew-proof material of Examples 1-7, Examples 12-18 and Comparative Examples 1-10 comprises the following steps:

[0077] The components are mixed, and extruded into granules at 220° C. by a twin-screw extruder to obtain a polypropylene mildew-proof material.

[0078] Table 1 Weight percentage of each component of polypropylene mildew-proof material of Examples 1-18 and Comparative Examples 1-10

[0079]

[0080]

[0081]

[0082]

[0083]

[0084]

[0085] Performance Testing

[0086] The following performance tests were performed on the polypropylene mildew-proof materials of each embodiment and comparative example:

[0087] (1) Atomization value test

[0088] The polypropylene mildew-proof materials of each embodiment and comparative example were respectively made into samples of 100 mm×100 mm×3 mm, and then, according to the gravimetric method of ISO 6452-2007 standard, heated at 80°C for 30 min, and the volatile content (mg) of the polypropylene mildew-proof materials of each embodiment and comparative example was measured respectively, and the content of the volatile matter was taken as the atomization value; the larger the atomization value, the greater the degree of atomization of the polypropylene mildew-proof material;

[0089] (2) Odor level test

[0090] Take 20g of the polypropylene mildew-proof material of each embodiment and comparative example and put it into a 1L odor bottle. After heating and baking at 80°C for 2 hours, evaluate the odor level. The odor levels are divided into:

[0091] Level 1 – no odor;

[0092] Level 2 - slight odor, but no disturbing odor;

[0093] Level 3 - There is a noticeable odor, but no disturbing odor;

[0094] Level 4 – disturbing odor;

[0095] Level 5 – strong disturbing odor;

[0096] Level 6 – unbearable odor;

[0097] (3) TVOC content test

[0098] According to ISO12219-2-2012 standard, 5 g of the polypropylene mildew-proof material of each embodiment and comparative example was taken and put into a 10 L sampling bag, which was sealed and filled with 10 L of nitrogen, and then put into an oven and heated at 60° C. for 30 min. The Tenax tube and the DNPH tube were used for sampling. The Tenax tube was measured by thermal desorption gas spectrometry, and the DNPH tube was eluted with acetonitrile and then the eluate was tested by liquid chromatography. The peak area value of the liquid chromatograph was taken as the TVOC content. The larger the peak area value, the greater the TVOC content of the polypropylene mildew-proof material.

[0099] In the present invention, the emission performance is reflected by the test results of atomization value, odor level, and TVOC content. When the test results of atomization value, odor level, and TVOC content of the polypropylene mildew-proof material are lower, it means that the emission performance of the polypropylene mildew-proof material is also lower.

[0100] (4) Anti-mildew effect test

[0101] The polypropylene mildew-proof materials of each embodiment and comparative example were respectively made into samples of 100 mm×100 mm×3 mm, and according to GB / T 2423.16-2022 / IEC 60068-2-10:2018 standard, the test method 1 of 6.1 and the severity level 1 (i.e., the strain culture cycle is 28 days) were adopted, and Aspergillus terreus was selected as the test strain, and the polypropylene mildew-proof materials of each embodiment and comparative example were tested respectively, and the experimental results were observed and the degree of mildew growth was graded; the order of the degree of mildew growth of different grades was: grade 0 < grade 1 < grade 2a < grade 2b < grade 3; the greater the degree of mildew growth, the worse the mildew-proof effect of the polypropylene mildew-proof material;

[0102] The experimental results are shown in the following table:

[0103] Table 2 Performance test results of various embodiments and comparative examples

[0104]

[0105]

[0106] As can be seen from Table 2, the polypropylene mildew-proof material of the present invention has lower emission performance (atomization value, odor level, TVOC) and stronger mildew-proof effect. Moreover, the mildew-proof effect can reach below level 2b, the atomization value can reach below 1.60 mg, the odor level can reach below level 4, and the TVOC content can reach below 40000. Specifically:

[0107] (1) By comparing Examples 1-6 and Comparative Examples 1-6, it can be seen that the polypropylene mildew-proof material of the present invention uses a mildew-proof agent auxiliary agent formed by compounding linear low-density polyethylene, styrene copolymer, and ethylene copolymer in a specific dosage ratio to help the mildew-proof agent to be effectively integrated and dispersed in the polypropylene material, thereby reducing the precipitation and volatilization of the mildew-proof agent, thereby reducing the emission performance of the polypropylene mildew-proof material and improving the mildew-proof effect of the polypropylene mildew-proof material.

[0108] (2) By comparing Examples 1 and 7-8, it can be seen that for different mildew inhibitors, the mildew inhibitor auxiliary agent of the present invention can help the mildew inhibitor to be effectively integrated and dispersed in the polypropylene material to varying degrees, reduce the precipitation and volatilization of the mildew inhibitor, and thus obtain a polypropylene mildew inhibitor material with lower evaporation and better mildew inhibitory effect.

[0109] (3) By comparing Examples 1, 9-10 and Comparative Examples 7-10, it can be seen that the present invention can drive the mildew inhibitor during the preparation of the polypropylene mildew-proof material by selecting talc and mica in a specific dosage ratio, further promoting the fusion and dispersion of the mildew inhibitor in the polypropylene material, and at the same time hindering the precipitation and volatilization of the mildew inhibitor, thereby further reducing the emission performance of the polypropylene mildew-proof material and improving the mildew-proof effect of the polypropylene mildew-proof material.

[0110] (4) By comparing Examples 1 and 12-14, it can be seen that in the preparation process of the polypropylene mildew-proof material of the present invention, the ability of talcum powder with different mesh sizes to drive the mildew-proof agent together with mica, and the ability to hinder the precipitation and volatilization of the mildew-proof agent are different. When the mesh size of talcum powder is 800-3000 mesh, it can better drive the mildew-proof agent together with mica and hinder the precipitation and volatilization of the mildew-proof agent, which is more conducive to further reducing the emission performance of the polypropylene mildew-proof material and improving the mildew-proof effect of the polypropylene mildew-proof material.

[0111] (5) By comparing Examples 1 and 15-16, it can be seen that the present invention fully exerts the effect of the anti-mildew auxiliary agent by adjusting the usage ratio of the anti-mildew agent and the anti-mildew auxiliary agent, thereby reducing the emission performance of the polypropylene anti-mildew material and improving the anti-mildew effect of the polypropylene anti-mildew material.

[0112] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

Claims

1. A polypropylene mildew-proof material, characterized in that: Calculated by weight, it includes the following components: 30-80 parts of polypropylene resin, 0.1-5 parts of mildewproof agent, 2-25 parts of mildewproof auxiliary agent, 0.1-45 parts of inorganic filler, 1-10 parts of compatibilizer; in: The anti-mildew auxiliary agent contains linear low-density polyethylene, styrene copolymer and ethylene copolymer in a weight ratio of 1:(0.1-1):(0.1-1).

2. The polypropylene mildew-proof material according to claim 1, characterized in that: Including at least one of the following (1)-(7): (1) The weight content of styrene in the styrene copolymer is 20-80%; (2) The weight content of ethylene in the ethylene copolymer is 60-90%; (3) The mildew preventer is at least one of a zinc ion mildew preventer, a silver ion mildew preventer, an organic chloride, zinc oxide, ammonium sulfate, and calcium phosphate; (4) The inorganic filler is a mixture of talc and filler A, and the filler A is at least one of mica and calcium carbonate; (5) The mesh size of the inorganic filler is 100-5000 mesh; (6) The compatibilizer is a polyolefin grafted compound; (7) The polypropylene anti-mildew material also includes an auxiliary agent.

3. The polypropylene mildew-proof material according to claim 2, characterized in that: Include at least one of (1)-(3): (1) The styrene copolymer is at least one of acrylonitrile-styrene copolymer, acrylonitrile-butadiene-styrene copolymer, and hydrogenated styrene-butadiene block copolymer; (2) The ethylene copolymer is at least one of an ethylene-butene copolymer and an ethylene-octene copolymer; (3) The inorganic filler is talcum powder and filler A in a weight ratio of 1:(0.1-1).

4. The polypropylene mildew-proof material according to claim 2, characterized in that: Include at least one of (1)-(3): (1) The mesh size of the talcum powder is 800-3000 mesh; (2) The mesh size of the mica is 500-800 mesh; (3) The mesh size of the calcium carbonate is 2000-4000 mesh.

5. The polypropylene mildew-proof material according to claim 2, characterized in that: Include at least one of (1)-(2): (1) The zinc ion-containing mildew inhibitor is zinc pyrithione; (2) The organic chloride is triclosan.

6. The polypropylene mildew-proof material according to claim 2, characterized in that: The polyolefin grafted material is at least one of maleic anhydride grafted polyethylene and maleic anhydride grafted POE.

7. The polypropylene mildew-proof material according to claim 1, characterized in that: The polypropylene mildew-proof material comprises the following components, calculated by weight: 35-75 parts of polypropylene resin, 1-3 parts of mildewproof agent, 4-20 parts of mildewproof auxiliary agent, 2-42 parts of inorganic filler, and 2-5 parts of compatibilizer.

8. The method for preparing the polypropylene mildew-proof material according to any one of claims 1 to 7, characterized in that: The steps include: The components are mixed, extruded and granulated to obtain the polypropylene mildew-proof material.

9. A mildew-proof article, characterized in that: The method is prepared by using the polypropylene mildew-proof material described in any one of claims 1 to 7.

10. Use of the polypropylene mildew-proof material according to any one of claims 1 to 7 in automobile interior decoration parts.

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