Antibacterial and mildewproof EVA (ethylene-vinyl acetate copolymer) composition as well as preparation method and application thereof

Abstract

The invention discloses an antibacterial and mildew-proof EVA (Ethylene Vinyl Acetate) composition, which belongs to the technical field of plastics and comprises the following components: 40 to 50 parts of ethylene-vinyl acetate copolymer, 10 to 20 parts of polyolefin elastomer POE (Polyolefin Elastomer), 5 to 20 parts of filler, 1 to 5 parts of lubricant and 5 to 10 parts of antibacterial and mildew-proof agent. 0.1 to 1 part of an antioxidant; the antibacterial and mildew-proof agent is prepared by loading an antibacterial and mildew-proof compound in silicon dioxide, and the EVA composition provided by the invention has good tensile strength, hydrophobic effect and antibacterial and mildew-proof performance, and is particularly suitable for being applied to shower curtain materials.

Description

Technical Field

[0001] The invention relates to the technical field of plastics, in particular to an antibacterial and anti-mildew EVA composition and a preparation method and application thereof. Background Art

[0002] EVA (ethylene-vinyl acetate copolymer) is a polymer material formed by the large-scale polymerization of ethylene and vinyl acetate under high pressure. It has good elasticity and softness, excellent optical and mechanical properties, and good processing performance. It is widely used in adhesives, sports protective gear, automotive interiors, electrical insulation materials, packaging materials, functional composite materials and other fields. The film made of EVA has no irritating odor, good waterproof performance, good corrosion resistance, good softness, and good drape. Compared with traditional cloth and PVC, it is more suitable for use as a shower curtain in a home environment. However, plastic materials are easy to attract the growth of microorganisms such as bacteria or mold in a humid environment, which causes plastic discoloration, degradation, odor, etc., and also has an adverse effect on human health. Therefore, in the prior art, antibacterial agents are often added to EVA compositions as biostabilizers to play a bactericidal or antibacterial role. Antibacterial agents on the market are mainly divided into two categories: organic and inorganic. Common organic antimicrobial agents such as isothiazolone and dioctyl phthalate have strong bactericidal effects, but due to their small molecular weight, they migrate to the polymer surface too quickly during use, are prone to decomposition and failure, and may cause certain harm to human health, and are prone to discoloration of plastics due to oxidation. In comparison, inorganic antimicrobial agents such as silver-zinc antimicrobial agents show better stability and safety, but their antimicrobial effects are relatively weak. Summary of the invention

[0003] In order to overcome the deficiencies of the above-mentioned prior art, the present invention provides an antibacterial and mildew-proof EVA composition and a preparation method and application thereof, to obtain an EVA composition with good tensile strength, hydrophobic effect and antibacterial and mildew-proof effect.

[0004] The technical solution for achieving the purpose of the present invention is as follows:

[0005] An antibacterial and mildewproof EVA composition comprises the following components by weight: 40-50 parts of ethylene-vinyl acetate copolymer, 10-20 parts of polyolefin elastomer POE, 5-20 parts of filler, 1-5 parts of lubricant, 5-10 parts of antibacterial and mildewproof agent, and 0.1-1 parts of antioxidant. The preparation method of the antibacterial and mildewproof agent is as follows:

[0006] S1. 2-hydroxyacetophenone and 2-quinoline-methylamine are dissolved in toluene, heated to 110-120°C for reflux reaction for 5-6 hours, cooled, added with malononitrile, and continued to reflux at 110-120°C for 5-6 hours. After cooling, the reaction mixture is poured into cold water, filtered to obtain a precipitate, washed, dried, and then recrystallized with ethanol to obtain an intermediate;

[0007] S2. The intermediate and ethylenediamine are mixed, carbon disulfide is added, and the mixture is refluxed at 110-120° C. for 4 hours. After the reaction is completed, the mixture is cooled, and the reaction mixture is poured into cold water, filtered to obtain a precipitate, washed, dried, and then recrystallized with ethanol to obtain an antibacterial and antifungal compound;

[0008] S3. dissolving the antibacterial and antifungal compound in ethanol, adding it into silicon dioxide under ultrasonication and stirring evenly, and obtaining the antibacterial and antifungal agent after drying.

[0009] Nitrogen heterocyclic compounds such as imidazole, pyrrole and quinoline and their derivatives have been proven to have good antibacterial and antifungal properties and are widely used in the fields of medicine, food, agriculture and materials. The present invention uses 2-hydroxyacetophenone and 2-quinoline-methylamine to in situ condense to generate α-aminoketone with a quinoline group, and then the α-aminoketone and malononitrile generate 2-aminopyrrole. 2-aminopyrrole and ethylenediamine are reacted with carbon disulfide to obtain 2-substituted imidazoline, and finally a 3-(2-dihydroimidazolyl)pyrrole-2-amine compound with a quinoline group is synthesized as an antibacterial and antifungal compound, and experiments have confirmed that it has antibacterial and antifungal activity. The antibacterial and mildew-proof compound is loaded on silica, and the amino group of the antibacterial and mildew-proof compound can attract the hydroxyl group on silica through hydrogen bonds, which can improve the dispersibility of the antibacterial and mildew-proof compound and delay the migration of the antibacterial and mildew-proof agent. However, when the ambient temperature rises, the release of the antibacterial and mildew-proof agent from the inside of the EVA composition can be accelerated, thereby achieving an antibacterial effect. The product is particularly suitable for use in shower curtain materials.

[0010] Preferably, the particle size of the silicon dioxide is 1 to 30 μm, more preferably 1 to 10 μm.

[0011] Preferably, the lubricant is at least one of zinc stearate, calcium stearate and stearic acid.

[0012] Preferably, the filler is at least one of calcium carbonate or talc, more preferably, the filler is calcium carbonate, and even more preferably, it is lipophilic and hydrophobic modified calcium carbonate.

[0013] Preferably, the antioxidant is at least one of antioxidant 1010 and antioxidant 168.

[0014] Preferably, the molar ratio of the 2-hydroxyacetophenone, 2-quinoline-methylamine and malononitrile is (1.1-1.3):1:(1.2-1.4), and the molar ratio of the intermediate to ethylenediamine is 1:(1.2-1.5).

[0015] Preferably, the mass ratio of the antibacterial and antifungal compound to silicon dioxide is (5-10): (90-95).

[0016] Preferably, the vinyl acetate content of the ethylene-vinyl acetate copolymer is 5wt% to 15wt%, more preferably 5wt% to 10wt%.

[0017] Preferably, the melt index of the ethylene-vinyl acetate copolymer is 0.35 to 5.0 g / 10 min at 190° C. and 2.16 kg.

[0018] Preferably, the polyolefin elastomer POE has a melt index of 1-13 g / 10 min at 190° C. and 2.16 kg, more preferably 5-13 g / 10 min.

[0019] The present invention also protects a preparation method of the antibacterial and mildew-proof EVA composition, comprising the following steps: mixing ethylene-vinyl acetate copolymer, polyolefin elastomer POE, filler, lubricant, antibacterial and mildew-proof agent, and antioxidant in proportion and stirring to obtain a semi-gelled mixture, shearing and kneading the semi-gelled mixture to obtain rubber particles; filtering the obtained rubber particles; and obtaining the antibacterial and mildew-proof EVA composition.

[0020] Preferably, the stirring speed is 580-1160 rpm and the stirring temperature is 85-105°C.

[0021] Preferably, the filtration is performed using a filter, the filter uses a 80-200 mesh filter screen to filter the colloid particles, and the screw speed of the filter is controlled below 60 rpm.

[0022] On the other hand, the present invention also protects the application of the antibacterial and mildew-proof EVA composition, specifically:

[0023] A shower curtain is prepared from the antibacterial and mildew-proof EVA composition.

[0024] The preparation method of the shower curtain comprises the following steps: casting the antibacterial and mildew-proof EVA composition particles to obtain a sheet; leading the formed sheet to a cooling roller for shaping through a traction wheel and winding it to obtain a coil; and printing the wound coil to obtain the antibacterial and mildew-proof shower curtain.

[0025] Preferably, the tape casting is carried out by using a tape casting machine, pushing the rubber particles to the die head of the tape casting machine for extrusion molding, and the temperature difference between the die head of the tape casting machine and the cooling roller is not less than 40° C.

[0026] Preferably, the temperature of the traction wheel is 150-180°C, and the temperature of the cooling roller is 10-25°C.

[0027] Beneficial Effects

[0028] The present invention provides an antibacterial and mildew-proof EVA composition and a preparation method and application thereof. On the one hand, an antibacterial and mildew-proof compound having amino, quinoline, pyrrole and imidazole groups is synthesized and loaded on silicon dioxide. The amino group of the antibacterial and mildew-proof compound can attract the hydroxyl group on the silicon dioxide through hydrogen bonds. While improving the dispersibility of the antibacterial and mildew-proof compound, part of the antibacterial and mildew-proof compound can be slowly released from the inside of the EVA composition when the ambient temperature rises, and the antibacterial and mildew-proof compound migrates to the surface of the EVA composition, thereby achieving the antibacterial and mildew-proof effect. On the other hand, by adding polyolefin elastomer POE and filler, the tensile strength and hydrophobic effect of the antibacterial and mildew-proof EVA composition are further improved, the attachment of bacteria and molds is reduced, and the antibacterial and mildew-proof performance is further improved, and the composition is particularly suitable as a material for making EVA shower curtains. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 Schematic diagram of the synthesis route of antibacterial and antifungal compounds;

[0030] Figure 2 This is the infrared spectrum of silica and antibacterial and antifungal agents. DETAILED DESCRIPTION

[0031] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] In the examples, the experimental methods used are conventional methods unless otherwise specified, and the materials, reagents, etc. used are all commercially available unless otherwise specified.

[0033] The raw materials used in the embodiments and comparative examples are described as follows:

[0034] Ethylene-vinyl acetate copolymer 1: vinyl acetate content 6%, melt index 2g / 10min at 190℃ and 2.16kg; brand 6J2, Yanshan Petrochemical;

[0035] Ethylene-vinyl acetate copolymer 2: vinyl acetate content 9%, melt index 2g / 10min at 190℃ and 2.16kg; brand 155, Yanshan Petrochemical;

[0036] Ethylene-vinyl acetate copolymer 3: vinyl acetate content 14%, melt index 2g / 10min at 190℃ and 2.16kg; brand 14J2, Yanshan Petrochemical;

[0037] Polyolefin elastomer POE 1: Melt index is 1.2 g / 10 min at 190 ° C and 2.16 kg, POE 7467, Dow Chemical, USA;

[0038] Polyolefin elastomer POE 2: melt index 5.0 g / 10 min at 190 ° C and 2.16 kg, POE 7447, Dow Chemical, USA;

[0039] Polyolefin elastomer POE 3: Melt index is 13.0 g / 10 min at 190 ° C and 2.16 kg, POE 8137, Dow Chemical, USA;

[0040] Filler: lipophilic and hydrophobic modified calcium carbonate, KH12, Guangxi Hezhou Kelong Powder Co., Ltd.;

[0041] Lubricant: calcium stearate, commercially available;

[0042] Silicon dioxide 1: 1 μm, Brofos-Si02-W01, Bohuasi Nanotechnology (Ningbo) Co., Ltd.;

[0043] Silicon dioxide 2: 6 μm, Brofos-Si02-W06, Bohuasi Nanotechnology (Ningbo) Co., Ltd.;

[0044] Silicon dioxide 3: 30 μm, Brofos-Si02-W30, Bohuasi Nanotechnology (Ningbo) Co., Ltd.;

[0045] 2-Hydroxyacetophenone (98%), malononitrile (99%), and carbon disulfide (99.9%) were all from Shanghai MacLean Biochemical Technology Co., Ltd.;

[0046] 2-Quinoline-methylamine: 95%, Beijing Bailingwei Technology Co., Ltd.;

[0047] Ethylenediamine: 99%, Jinan Liyang Chemical Co., Ltd.;

[0048] Antibacterial and antifungal agent 1: Homemade, the preparation method is as follows:

[0049] S1. Dissolve 1.1 mol of 2-hydroxyacetophenone and 1 mol of 2-quinoline-methylamine in 5 L of toluene, heat to 115°C for reflux reaction for 5 to 6 hours, cool, add 1.2 mol of malononitrile, continue to reflux at 115°C for 5 to 6 hours, cool, pour the reaction mixture into cold water, filter to obtain a precipitate, wash with deionized water, dry at 80°C, and recrystallize with ethanol to obtain an intermediate;

[0050] S2. 1 mol of the intermediate and 1.5 L of ethylenediamine were mixed, 140 ml of carbon disulfide was added dropwise, and the mixture was refluxed at 115° C. for 4 hours. After the reaction was completed, the mixture was cooled, and the reaction mixture was poured into cold water. The precipitate was filtered to obtain a precipitate, which was washed with deionized water, dried at 80° C., and then recrystallized with ethanol to obtain an antibacterial and antifungal compound. The synthetic route of the antibacterial and antifungal compound is as follows: Figure 1 As shown; the yield is 84%, 1H NMR (DMSO-d6, 300MHz) δ (ppm): 3.02 (t, 2H, J = 8.1Hz, CH2, imidazoline), 3.39 (t, 2H, J = 8.1Hz, CH, imidazoline), 7.56-7.60 (m, 3H, Ar-H), 7.80 (t, 1H, J = 8.0Hz, Ar-H), 7.92 (d, 1H, J = 8.0Hz, Ar-H), 7.97 (s, 1H, Ar-H), 8.00 (d, 1H, J = 8.0Hz, Ar-H), 8.14 (d, 1H, J = 8.5Hz, Ar-H), 8.51-8.59 (m, 3H, Ar-H + NH2);

[0051] The minimum inhibitory concentration (MIC) test of microorganisms for antibacterial and antifungal compounds was carried out as follows: Staphylococcus aureus, Escherichia coli and Pseudomonas aeruginosa were cultured on nutrient agar medium at 37°C under aerobic conditions overnight, and Candida albicans was cultured on Sabouraud dextrose agar medium at 35°C under aerobic conditions for 48 hours. Then, a suspension of bacterial and fungal standard strains was prepared in a sterile saline solution and its concentration was adjusted to 0.5 McFarland turbidity (1-2×10 8 The antibacterial and antifungal compounds were dissolved in dimethyl sulfoxide at a concentration of 1000 mg / ml, and then the antibacterial and antifungal compounds were serially diluted in test tubes of corresponding culture media (trypticase soy broth and nutrient broth for antibacterial, Sabouraud dextrose broth for antifungal) to obtain antibacterial and antifungal compound solutions of different concentrations, so as to obtain a concentration range of 5 to 400 mg / ml, and then the final concentration was 5×10 5Colony forming units were inoculated in different test tubes with different strains. The test tubes were incubated under aerobic conditions (bacteria at 37°C for 24 hours) and (fungi at 28°C for 48 hours), and the minimum inhibitory concentrations (MICs) were determined by visually observing the turbidity after the specified time; the minimum inhibitory concentration was defined as the lowest concentration of the compound that completely eliminated the turbidity after the specified incubation period. Three replicates were measured and the average minimum inhibitory concentration value was calculated. The final minimum inhibitory concentration values ​​are shown in Table 1.

[0052] Table 1 Average minimum inhibitory concentration values ​​of antibacterial and antifungal compounds

[0053]

[0054] S3. Dissolve 5 g of the antibacterial and antifungal compound in 100 ml of ethanol, add dropwise to 95 g of silica 1 under ultrasonic conditions, stir evenly, and dry at 80 ° C to obtain an antibacterial and antifungal agent. The red light spectra of silica 1 and the antibacterial and antifungal agent are as follows: Figure 2 As shown, the supported silica has a peak at 3427 cm -1 and 1623cm -1 The characteristic peaks of -NH2 and -NH appeared.

[0055] Antibacterial and antifungal agent 2: The preparation method is different from that of antibacterial and antifungal agent 1, except that the silicon dioxide 1 used is replaced by silicon dioxide 2;

[0056] Antibacterial and antifungal agent 3: The preparation method is different from that of antibacterial and antifungal agent 1, except that the silicon dioxide 1 used is replaced by silicon dioxide 3;

[0057] Antibacterial and mildew-proof agent 4: The preparation method is different from that of antibacterial and mildew-proof agent 1, except that the added amount of the antibacterial and mildew-proof compound is 10 g, the mass of silicon dioxide is 90 g, and the ethanol content remains unchanged.

[0058] Antibacterial and mildew-proof agent 5: The preparation method is different from that of antibacterial and mildew-proof agent 1 in that: the antibacterial and mildew-proof compound is not loaded, but directly added in the preparation of the EVA composition, and the missing silica component is supplemented with an equal amount of filler;

[0059] Antioxidant: a compound of antioxidant 1010 and antioxidant 168 in a mass ratio of 1:1, commercially available;

[0060] Unless otherwise specified, the components and raw materials used in the embodiments and comparative examples of the present invention are all commercially available raw materials, and the components and raw materials used in each parallel experiment are all of the same kind.

[0061] Examples and Comparative Examples

[0062] An antibacterial and mildewproof EVA composition, the preparation method of which comprises the following steps: mixing ethylene-vinyl acetate copolymer, polyolefin elastomer POE, filler, lubricant, antibacterial and mildewproof agent, and antioxidant in proportion and stirring to obtain a semi-gelled mixture, shearing and kneading the semi-gelled mixture to obtain colloid particles; filtering the obtained colloid particles; obtaining the antibacterial and mildewproof EVA composition, the stirring speed is 800 rpm, and the stirring temperature is 105° C. Filtration is performed by using a filter, the filter uses a 100-mesh filter screen to filter the colloid particles, and the screw speed of the filter is controlled at 40 rpm; the specific components and parts of the antibacterial and mildewproof EVA composition are shown in Table 2;

[0063] Table 2 Specific components and parts of antibacterial and antifungal EVA composition

[0064]

[0065]

[0066] The antibacterial and mildew-proof EVA composition pellets were cast by a casting machine, and the pellets were pushed to the die head of the casting machine for extrusion molding. The temperature difference between the die head of the casting machine and the cooling roller was not less than 40° C. to obtain a sheet with a thickness of 0.15 mm. The obtained sheet was subjected to the following performance tests, and the results are shown in Table 3:

[0067] (1) Tensile strength: The tensile properties of the material were tested in accordance with ISO 527-2012 “Determination of tensile properties of plastics” at 23°C and a tensile rate of 50 mm / min.

[0068] (2) Hydrophobicity: The hydrophobicity of the sheet is evaluated by measuring the water contact angle of the sheet in the air. The larger the contact angle, the less likely the sheet surface is to be wetted, and the better the hydrophobicity.

[0069] (3) Antibacterial rate: refer to Appendix A of QB / T2591-2003 for testing and calculation at 40°C, where the antibacterial rate calculation formula is: R(%) = (BC) / B×100, where: R-antibacterial rate (%), B-average number of recovered bacteria in blank control samples (cfu / piece), C-average number of recovered bacteria in antibacterial plastic samples (cf / piece);

[0070] (4) Anti-fungal grade: Tested and graded at 40°C with reference to Appendix B of QB / T2591-2003, where the mold growth grades of the samples are as follows: Grade 0 - no growth, i.e. no growth observed under a microscope (magnification 50 times); Grade 1 - trace growth, i.e. growth visible to the naked eye, but the growth coverage area is less than 10%; Grade 2 - growth coverage area is not less than 10%.

[0071] Table 3 Performance test results of antibacterial and antifungal EVA compositions

[0072]

[0073] It can be seen from the data of the embodiments and comparative examples that the EVA composition provided by the present invention has good tensile strength, hydrophobicity and antibacterial and antifungal properties.

[0074] Among them, when the vinyl acetate content of the ethylene-vinyl acetate copolymer in the EVA composition is in the range of 5wt% to 10wt%, the tensile strength, hydrophobic effect and antibacterial and mildew-proof properties of the EVA composition are the best. This is because the polarity of vinyl acetate is relatively large. When it accounts for too much, it is easy to destroy the crystalline area formed by the polyethylene chain segment, thereby reducing the tensile strength. In addition, the surface tension will also increase with the increase of VA content, increasing the wettability and adhesion of the EVA material, making it easy for bacteria and mold spores to adhere to the surface of the EVA material, and the antibacterial and mildew-proof properties will deteriorate.

[0075] Polyolefin elastomer POE can increase the flexibility of the EVA composition in the EVA material, and the antibacterial and mildew-proof performance of the EVA composition is best when the melt index is in the range of 5 to 13 g / 10 min. This is because when the melt index increases, the fluidity of the material is better, which is conducive to the dispersion of powder materials such as fillers and antibacterial and mildew-proof agents. However, too high a melt index will lead to a decrease in tensile properties.

[0076] As a carrier of antibacterial and mildew-proof compounds, the particle size of silicon dioxide also needs to be within a certain range to achieve better results. When the particle size is too large, it is easy to increase the surface roughness of the EVA composition, making it easy for bacteria to attach, and the antibacterial and mildew-proof performance decreases.

[0077] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. An antibacterial and antifungal EVA composition, characterized in that: The composition includes the following components by weight: 40-50 parts of ethylene-vinyl acetate copolymer, 10-20 parts of polyolefin elastomer POE, 5-20 parts of filler, 1-5 parts of lubricant, 5-10 parts of antibacterial and mildew-proof agent, and 0.1-1 parts of antioxidant. The preparation method of the antibacterial and mildew-proof agent is as follows: S1. Dissolve 2-hydroxyacetophenone and 2-quinoline-methylamine in toluene, heat to 110-120°C for reflux reaction for 5-6 hours, cool, add malononitrile, continue to reflux at 110-120°C for 5-6 hours, cool, pour the reaction mixture into cold water, filter to obtain a precipitate, wash, dry and recrystallize with ethanol to obtain an intermediate; S2. The intermediate and ethylenediamine are mixed, carbon disulfide is added, and the mixture is refluxed at 110-120° C. for 4 hours. After the reaction is completed, the mixture is cooled, and the reaction mixture is poured into cold water, filtered to obtain a precipitate, washed, dried, and then recrystallized with ethanol to obtain an antibacterial and antifungal compound; S3. dissolving the antibacterial and antifungal compound in ethanol, adding it into silicon dioxide under ultrasonication and stirring evenly, and obtaining the antibacterial and antifungal agent after drying.

2. The antibacterial and mildew-proof EVA composition according to claim 1, characterized in that: The particle size of the silicon dioxide is 1 to 10 μm.

3. The antibacterial and mildew-proof EVA composition according to claim 1, characterized in that: The lubricant is at least one of zinc stearate, calcium stearate and stearic acid.

4. The antibacterial and mildew-proof EVA composition according to claim 1, characterized in that: The filler is at least one of calcium carbonate and talc.

5. The antibacterial and mildew-proof EVA composition according to claim 1, characterized in that: The antioxidant is at least one of antioxidant 1010 and antioxidant 168.

6. The antibacterial and mildew-proof EVA composition according to claim 1, characterized in that: The molar ratio of the 2-hydroxyacetophenone, 2-quinoline-methylamine and malononitrile is (1.1-1.3):1:(1.2-1.4), and the molar ratio of the intermediate to ethylenediamine is 1:(1.2-1.5).

7. The antibacterial and mildew-proof EVA composition according to claim 1, characterized in that: The mass ratio of the antibacterial and antifungal compound to silicon dioxide is (5-10): (90-95).

8. The antibacterial and mildew-proof EVA composition according to claim 1, characterized in that: The vinyl acetate content of the ethylene-vinyl acetate copolymer is 5wt% to 15wt%, and the melt index of the polyolefin elastomer POE is 1-13g / 10min under the conditions of 190°C and 2.16kg.

9. The method for preparing the antibacterial and mildew-proof EVA composition according to any one of claims 1 to 8, characterized in that: The following steps are involved: Ethylene-vinyl acetate copolymer, polyolefin elastomer POE, filler, lubricant, antibacterial and mildew-proof agent, and antioxidant are mixed in proportion and stirred to obtain a semi-gelled mixture, and the semi-gelled mixture is sheared and kneaded to obtain rubber particles; the obtained rubber particles are filtered to obtain an antibacterial and mildew-proof EVA composition.

10. A shower curtain, characterized in that: The antibacterial and mildew-proof EVA composition is prepared from the antibacterial and mildew-proof EVA composition according to any one of claims 1 to 8.

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