Antibacterial plastic alloy applied to baby products and preparation method thereof

Abstract

The invention relates to the technical field of antibacterial plastics, and particularly discloses an antibacterial plastic alloy applied to baby products and a preparation method of the antibacterial plastic alloy. The antibacterial plastic alloy applied to the baby products is prepared from the following raw materials based on the total mass of the antibacterial plastic alloy: a resin material, a lubricant, a compatilizer, a catalyst, a composite antibacterial agent and an antioxidant, based on the total mass of the composite antibacterial agent, the composite antibacterial agent is prepared from the following raw materials in parts by weight: nano zirconium phosphate loaded zinc, carbon nanotubes, polyhexamethylene biguanide, decyl dimethyl ammonium chloride and lauryl sodium sulfate. The antibacterial plastic alloy prepared by adopting the preparation method disclosed by the invention has the highest bacteriostasis rates of 99.99% and 99.97% on staphylococcus aureus and escherichia coli, and the antibacterial property of the antibacterial plastic alloy is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of antibacterial plastics, more particularly, it relates to an antibacterial plastic alloy applied to baby products and a preparation method thereof. BACKGROUND

[0002] With the rapid development of the baby product market in China, plastic products are widely used in the fields of toys, tableware, stationery and the like due to their light weight, durability and easy processing. Baby products not only need to have certain strength and safety, but also need to have certain antibacterial performance. Baby products are prone to breed bacteria, mold and other microorganisms after long-term use, which threatens the health of babies. Especially, the immune system of babies has not yet developed completely, and frequent contact with baby products with bacteria can cause skin infections, respiratory diseases and even cross-infection and other problems.

[0003] Plastic alloy is a new type of high-performance plastic material with high performance, functionalization and specialization obtained by physical blending or chemical grafting. Compared with plastic synthesized by chemical synthesis of high molecular resin, plastic alloy has short cycle, small investment, simple process and low cost, and is widely used in the baby product industry. However, there are few plastic alloys with antibacterial function on the market at present.

[0004] In the related art, in order to make the plastic alloy have antibacterial property, chitosan is added as antibacterial component in raw materials, but the antibacterial property of the obtained plastic alloy is weak, which is difficult to meet the actual use demand of the market. SUMMARY

[0005] In order to improve the antibacterial property of the antibacterial plastic alloy, the present application provides an antibacterial plastic alloy applied to baby products and a preparation method thereof.

[0006] In the first aspect, the present application provides an antibacterial plastic alloy applied to baby products, which adopts the following technical scheme: an antibacterial plastic alloy applied to baby products includes the following raw materials by weight: the total mass of the antibacterial plastic alloy includes the following raw materials by weight: resin material 70-90 parts, lubricant 1-3 parts, compatibilizer 1-2 parts, catalyst 1-3 parts, toughening agent 1-6 parts, composite antibacterial agent 0.1-10 parts, antioxidant 0.5-2 parts; The resin material is selected from one or more of polycarbonate, acrylonitrile-butadiene-styrene copolymer mixture, polybutylene terephthalate, polyamide, polyformaldehyde, polyphenyl ether, polyvinyl chloride, polyethylene, polypropylene and polystyrene; the composite antibacterial agent includes the following raw materials by weight based on the total mass of the composite antibacterial agent: nano-zirconium phosphate loaded with zinc 20-30 parts, carbon nanotube 1-3 parts, polyhexamethylene biguanide 5-10 parts, decyl dimethyl ammonium chloride 5-10 parts, and sodium dodecyl sulfate 0.5-1 part.

[0007] The application is suitable for the selection of resin material 70-90 parts, lubricant 1-3 parts, compatibilizer 1-2 parts, catalyst 1-3 parts, toughening agent 1-6 parts, composite antibacterial agent 0.1-10 parts, antioxidant 0.5-2 parts, any value in the respective range can be selected, and the antibacterial property of the antibacterial plastic alloy applied to baby products can be improved.

[0008] The application selects nano zirconium phosphate loaded with zinc 20-30 parts, carbon nanotubes 1-3 parts, polyhexamethylene biguanide 5-10 parts, decyl dimethyl ammonium chloride 5-10 parts, and sodium dodecyl sulfate 0.5-1 part, any value in the respective range can be selected, and the antibacterial property of the antibacterial plastic alloy applied to baby products can be improved.

[0009] The resin material is selected from one or more of polycarbonate, acrylonitrile-butadiene-styrene copolymer mixture, polybutylene terephthalate, polyamide, polyformaldehyde, polyphenyl ether, polyvinyl chloride, polyethylene, polypropylene, and polystyrene.

[0010] By adopting the above technical solution, the nano zirconium phosphate loaded with zinc has a large specific surface area, and compared with micron zirconium phosphate loaded with zinc, the loading capacity and contact efficiency of zinc ions are improved, and the antibacterial effect is higher.

[0011] The addition of carbon nanotubes with the function of physically piercing bacterial cell membranes can enhance the contact sterilization effect of zinc ions in nano zirconium phosphate, and also can serve as an efficient adsorption carrier for zinc ions, thereby improving the loading capacity of zinc ions on the surface of zirconium phosphate, and thus the antibacterial activity of nano zirconium phosphate loaded with zinc. Second, carbon nanotubes have electrical conductivity, which can improve the dispersibility of nano zirconium phosphate in raw materials, avoid aggregation of zinc ions in the carrier, delay the release of zinc ions, and thus prolong the antibacterial time.

[0012] Polyhexamethylene biguanide and decyl dimethyl ammonium chloride are added in combination, polyhexamethylene biguanide has a positive poly-cation and is not easy to migrate, and can be adsorbed on the negatively charged cell membrane of bacteria together with decyl dimethyl ammonium chloride through electrostatic interaction, thereby destroying the membrane integrity and interfering with metabolism, and having a synergistic antibacterial effect. The addition of sodium dodecyl sulfate can improve the stability of other raw materials of the antibacterial agent in the composite antibacterial agent.

[0013] As a preferred embodiment: an antibacterial plastic alloy applied to baby products, comprising the following raw materials in terms of total mass of the antibacterial plastic alloy: resin material 75-85 parts, lubricant 1.5-2.5 parts, compatibilizer 1.3-1.8 parts, catalyst 1.5-2.5 parts, toughening agent 2-5 parts, composite antibacterial agent 3-8 parts, antioxidant 1-1.5 parts; The composite antibacterial agent comprises the following raw materials in parts by weight, based on the total mass of the composite antibacterial agent: nano-zirconium phosphate supported zinc 23-27 parts, carbon nanotubes 1.5-2.5 parts, polyhexamethylene biguanide 7-9 parts, decyl dimethyl ammonium chloride 7-9 parts, and sodium dodecyl sulfate 0.7-0.9 parts.

[0014] The application is suitable for the selection of resin materials for antibacterial plastic alloys for baby products, and the resin materials comprise 75-85 parts of antibacterial plastic alloy resin material, 1.5-2.5 parts of lubricant, 1.3-1.8 parts of compatibilizer, 1.5-2.5 parts of catalyst, 2-5 parts of toughening agent, 3-8 parts of composite antibacterial agent, and 1-1.5 parts of antioxidant, and any value within the respective ranges can be selected, and the antibacterial property of the antibacterial plastic alloy for baby products can be improved.

[0015] The application selects nano-zirconium phosphate supported zinc 23-27 parts, carbon nanotubes 1.5-2.5 parts, polyhexamethylene biguanide 7-9 parts, decyl dimethyl ammonium chloride 7-9 parts, and sodium dodecyl sulfate 0.7-0.9 parts as the composite antibacterial agent, and any value within the respective ranges can be selected, and the antibacterial property of the antibacterial plastic alloy for baby products can be improved.

[0016] Preferably, the weight ratio of the carbon nanotubes to the nano-zirconium phosphate supported zinc is 1:(15-25).

[0017] By adjusting the weight ratio of the carbon nanotubes to the nano-zirconium phosphate supported zinc, the antibacterial effect of the nano-zirconium phosphate supported zinc can be further improved, thereby improving the antibacterial property of the antibacterial plastic alloy for baby products.

[0018] Preferably, the nano-zirconium phosphate supported zinc is prepared by modification, and specifically: S1, cetyltrimethylammonium bromide is added to water and mixed, and stirred uniformly to obtain a cetyltrimethylammonium bromide solution; S2, nano-zirconium phosphate supported zinc is added to water, ultrasonically dispersed, 50% n-propylamine aqueous solution is added, stirred at 23±2℃ for 22-24h, centrifuged, washed, dried, and the pretreated nano-zirconium phosphate supported zinc is obtained; S3, the pretreated nano-zirconium phosphate supported zinc is added to water, the cetyltrimethylammonium bromide solution is added, stirred at 65-75℃ for 12-14h, centrifuged, washed, dried, calcined, and the modified nano-zirconium phosphate supported zinc is obtained; The mass of the cetyltrimethylammonium bromide to the volume of water is 1:(40-50); the mass of the nano-zirconium phosphate supported zinc to the volume of water is 1:(90-100); the volume of the 50% n-propylamine aqueous solution to the mass of the nano-zirconium phosphate supported zinc is 1:(1-2); and the mass of the cetyltrimethylammonium bromide to the mass of the nano-zirconium phosphate supported zinc is 1:(1.5-2.5).

[0019] By adopting the above scheme, the nano-zirconium phosphate loaded with zinc is first intercalated and expanded by adding an aqueous solution of n-propylamine, which facilitates the insertion of cetyltrimethylammonium bromide into the interlayer, and then the nano-zirconium phosphate loaded with zinc is intercalated and modified by cetyltrimethylammonium bromide, thereby reducing the agglomeration of the nano-zirconium phosphate loaded with zinc and improving the dispersibility of the nano-zirconium phosphate loaded with zinc in the composite antibacterial agent system. After drying and calcining, the zinc ions are stably embedded in the crystal structure, reducing the loss of zinc ions and ensuring the antibacterial property of the modified nano-zirconium phosphate loaded with zinc.

[0020] As a preferred, the composite antibacterial agent further comprises the following raw materials by weight: 1-5 parts of nano-chitosan.

[0021] By adopting the above technical scheme, the nano-chitosan can adsorb decyl dimethyl ammonium chloride at the folds of the bacterial membrane, increasing the local concentration of decyl dimethyl ammonium chloride, which is more conducive to destroying the cell membrane; and both nano-chitosan and decyl dimethyl ammonium chloride are stacked by positive charges, nano-chitosan can promote decyl dimethyl ammonium chloride to penetrate into the interior of the cell membrane, thereby enhancing the adsorption and penetration of the cell membrane, accelerating the rupture of the cell membrane, and further improving the antibacterial property of the antibacterial plastic alloy.

[0022] As a preferred, the weight ratio of nano-chitosan to decyl dimethyl ammonium chloride is 1:(2-3).

[0023] By adopting the above technical scheme, adjusting the weight ratio of nano-chitosan to decyl dimethyl ammonium chloride can further improve the antibacterial performance of nano-chitosan and decyl dimethyl ammonium chloride, thereby improving the antibacterial property of the antibacterial plastic alloy.

[0024] As a preferred, the composite antibacterial agent further comprises the following raw materials by weight: 5-15 parts of sulfonated chitosan.

[0025] By adopting the above technical scheme, the sulfonic acid group of sulfonated chitosan and the amino group of nano-chitosan can form a polyelectrolyte complex through electrostatic attraction, enhancing the adsorption capacity of the bacterial cell membrane, and nano-chitosan directly destroys the membrane integrity, sulfonated chitosan interferes with the ion balance of the membrane, and the two are compounded, which can promote the penetration efficiency of sulfonated chitosan and nano-chitosan, thereby improving the antibacterial property of the composite antibacterial agent, and further improving the antibacterial property of the antibacterial plastic alloy.

[0026] In a second aspect, the present application provides a preparation method of the antibacterial plastic alloy for baby products, which is any one of the above, and is specifically realized by the following technical scheme: A preparation method of an antibacterial plastic alloy for baby products, comprising the following operation steps: S1, first dry the resin material at 80-90℃ for 3-4h, then add the composite antibacterial agent and the remaining raw materials after drying to obtain the material; S2, blending and melting the material obtained in step S1, extruding, granulating and drying to obtain the antibacterial plastic alloy.

[0027] In summary, the present application includes at least one of the following beneficial technical effects: (1) The present application controls the types and amounts of raw materials of the antibacterial plastic alloy applied to baby products, so that the antibacterial rates of the antibacterial plastic alloy on Staphylococcus aureus and Escherichia coli are 99.90%-99.92% and 99.87%-99.89% respectively, thereby improving the antibacterial property of the antibacterial plastic alloy.

[0028] (2) The present application modifies the nano-zirconium phosphate loaded with zinc, so that the antibacterial rates of the antibacterial plastic alloy on Staphylococcus aureus and Escherichia coli are 99.94% and 99.91% respectively, thereby further improving the antibacterial property of the antibacterial plastic alloy.

[0029] (3) The present application adds nano-chitosan to the raw materials of the antibacterial plastic alloy applied to baby products, and adjusts the weight ratio of nano-chitosan to decyl dimethyl ammonium chloride, so that the antibacterial rates of the antibacterial plastic alloy on Staphylococcus aureus and Escherichia coli are 99.96-99.97% and 99.93-99.94% respectively, thereby further improving the antibacterial property of the antibacterial plastic alloy.

[0030] (4) The present application adds sulfonated chitosan to the raw materials of the antibacterial plastic alloy applied to baby products, so that the antibacterial rates of the antibacterial plastic alloy on Staphylococcus aureus and Escherichia coli are 99.99% and 99.96-99.97% respectively, thereby further improving the antibacterial property of the antibacterial plastic alloy. DETAILED DESCRIPTION

[0031] The following is a detailed description of the present application in conjunction with specific examples. The following raw materials in this application are all commercially available products. They are provided to fully disclose the raw materials in this application and should not be construed as limiting the sources of the raw materials. Specifically, the resin material is ABS resin, brand Chimei, model PA-746; the lubricant is polyethylene glycol, molecular weight 4000; the compatibilizer is DuPont, model Elvaloy HP 4051; catalyst, lithium acetylacetonate, with an effective substance content of 99%; toughening agent, high-rubber powder, brand ABS, model JHS-4; antioxidant, model antioxidant 1098; nano zirconium phosphate loaded with zinc, zinc loading 5-10%, particle size 50nm; carbon nanotubes, diameter 30-60nm, length 1-2μm; polyhexamethylene biguanide, with an effective ingredient content of 25%; didecyldimethylammonium chloride, with an effective ingredient content of 80%; sodium lauryl sulfate, with an effective ingredient content of 99%; hexadecyltrimethylammonium bromide, with an effective ingredient content of 99%; n-propylamine, with an effective ingredient content of 99.5%; nano chitosan, molecular weight 161.16, particle size 20nm; sulfonated chitosan, with an effective ingredient content of 95%, model hr01.

[0032] The following is an example of the preparation of modified nano-zirconium phosphate loaded with zinc: Preparation Example 1 The modified nano-zirconium phosphate-supported zinc of Preparation Example 1 is obtained by the following steps: S1. Add 500 g of cetyltrimethylammonium bromide to 22.5 L of water and mix, stirring evenly to obtain a cetyltrimethylammonium bromide solution; S2, adding 1 kg of nano-zirconium phosphate loaded zinc to 100 L of water, ultrasonically dispersing, adding 500 mL of 50% n-propylamine aqueous solution, stirring at 23 ° C for 24 h, centrifuging, washing, and drying to obtain pretreated nano-zirconium phosphate loaded zinc; S3. Add 1 kg of pretreated nano-zirconium phosphate loaded with zinc to 100 L of water, add hexadecyltrimethylammonium bromide solution, stir at 45° C. for 12 h, centrifuge, wash, dry, and calcine to obtain modified nano-zirconium phosphate loaded with zinc.

[0033] Example 1 The antibacterial plastic alloy for baby products of Example 1 is prepared by the following steps: S1. According to the dosage of each raw material in Table 1 and Table 2, the resin material is first dried at 85° C. for 3 h, and after drying, the composite antibacterial agent and the remaining raw materials are added to obtain a material; S2. The materials obtained in step S1 are blended and melted at 220° C., extruded, granulated, and dried to obtain an antibacterial plastic alloy.

[0034] The composite antibacterial agent is prepared by the following steps: mixing the raw materials according to the amounts in Table 2, and stirring to obtain the composite antibacterial agent.

[0035] Examples 2-5 The antibacterial plastic alloy for baby products of Example 2-5 has the same preparation method and raw material types as Example 1, except that the amounts of the raw materials in the composite antibacterial agent are different, as shown in Table 2.

[0036] Table 1 Amounts of raw materials (kg) for antibacterial plastic alloys for baby products of Examples 1-5 Examples 1-5 Resin material 80 Lubricant 2 Compatibilizer 1.5 Catalyst 1.5 Toughening agent 3 Composite antibacterial agent 2 Antioxidant 0.8 Table 2 Amounts of raw materials (kg) for composite antibacterial agents of Examples 1-5 Example 6 The antibacterial plastic alloy for baby products of Example 6 has the same preparation method and raw material types and amounts as Example 3, except that the modified nano-zirconium phosphate supported zinc prepared in Preparation Example 1 is used, and the amounts of the remaining raw materials are the same as in Example 1.

[0037] Examples 7-11 The antibacterial plastic alloy for baby products of Examples 7-11 has the same preparation method and raw material types and amounts as Example 6, except that the composite antibacterial agent also includes nano-chitosan, and the specific amounts are shown in Table 3.

[0038] Table 3 Amounts of raw materials (kg) for composite antibacterial agents of Examples 7-11 Example 7 Example 8 Example 9 Example 10 Example 11 Nano-zirconium phosphate loaded zinc 20 20 20 20 20 Carbon nanotube 1 1 1 1 1 Polyhexamethylene biguanide 8 8 8 8 8 Decyl dimethyl ammonium chloride 5.5 7.3 7.9 8.25 8.8 Nano-chitosan 5.5 3.7 3.1 2.75 2.2 Sodium dodecyl sulfate 0.8 0.8 0.8 0.8 0.8 Examples 12-16 The antibacterial plastic alloy for baby products of Examples 12-16 has the same preparation method and raw material types and amounts as Example 6, except that the composite antibacterial agent also includes sulfonated chitosan, and the specific amounts are shown in Table 4.

[0039] Table 4 Amounts of raw materials (kg) for composite antibacterial agents of Examples 12-16 Comparative Example 1 The antibacterial plastic alloy for baby products of Comparative Example 1 has the same preparation method as Example 1, except that the nano-zirconium phosphate supported zinc in the composite antibacterial agent is replaced by an equal amount of carbon nanotubes, and the amounts of the remaining raw materials are the same as in Example 1.

[0040] Comparative Example 2 The antibacterial plastic alloy for baby products of Comparative Example 1 was prepared by the same method as that of Example 1, except that the carbon nanotubes in the composite antibacterial agent raw material were replaced by an equal amount of nano-zirconium phosphate loaded with zinc, and the other raw materials and amounts were the same as those of Example 1.

[0041] Comparative Example 3 The antibacterial plastic alloy for baby products of Comparative Example 3 was prepared by the same method as that of Example 1, except that the polyhexamethylene biguanide in the composite antibacterial agent raw material was replaced by an equal amount of decyl dimethyl ammonium chloride, and the other raw materials and amounts were the same as those of Example 1.

[0042] Comparative Example 4 The antibacterial plastic alloy for baby products of Comparative Example 4 was prepared by the same method as that of Example 1, except that the decyl dimethyl ammonium chloride in the composite antibacterial agent raw material was replaced by an equal amount of polyhexamethylene biguanide, and the other raw materials and amounts were the same as those of Example 1.

[0043] Comparative Example 5 The antibacterial plastic alloy for baby products of Comparative Example 5 was prepared by the same method as that of Example 1, except that no sodium dodecyl sulfate was added to the composite antibacterial agent raw material, and the other raw materials and amounts were the same as those of Example 1.

[0044] Performance detection The antibacterial plastic alloys obtained in Examples 1-16 and Comparative Examples 1-5 were detected for performance by the following detection standards or methods, and the detection results are shown in Table 5.

[0045] Tensile strength: The tensile strength of the antibacterial ABS resin was detected by GB / T 1040-2018 “Determination of tensile properties of plastics”.

[0046] Bending strength: The bending strength of the antibacterial ABS resin was detected by GB / T 9341-2008 “Determination of bending properties of plastics”.

[0047] Bacteriostatic rate: The bacteriostatic rate of the antibacterial ABS resin on Staphylococcus aureus and Escherichia coli was detected by QB / T 2591-2003A “Test method for antibacterial performance of antibacterial plastics and antibacterial effect”.

[0048] Table 5 Performance detection results of antibacterial plastic alloys The detection results of Table 5 show that the bending strength and tensile strength of the antibacterial plastic alloy obtained in the application are the highest, which are 81.2 MPa and 51.5 MPa respectively, and the antibacterial plastic alloy has high mechanical properties; and the antibacterial rates of the antibacterial plastic alloy obtained in the application on Staphylococcus aureus and Escherichia coli are the highest, which are 99.99% and 99.97% respectively, and the antibacterial property of the antibacterial plastic alloy is improved. It can be seen that the antibacterial plastic alloy prepared in the application can be used for infant products to improve the antibacterial property of the infant products.

[0049] In Examples 1-5, the antibacterial rates of the antibacterial plastic alloys of Examples 2-4 on Staphylococcus aureus and Escherichia coli are 99.90%-99.92% and 99.87%-99.89% respectively, which are higher than those of Examples 1 and 5; it shows that the weight ratio of carbon nanotubes to nano-zirconium phosphate loaded with zinc of 1:(15-25) is more appropriate, and the antibacterial property of the antibacterial plastic alloy is improved.

[0050] In Examples 6 and 2-4, the antibacterial rates of the antibacterial plastic alloy of Example 6 on Staphylococcus aureus and Escherichia coli are 99.94% and 99.91% respectively, which are higher than those of Examples 2-4; it shows that the modification of nano-zirconium phosphate loaded with zinc can further improve the antibacterial property of the antibacterial plastic alloy. It may be related to the intercalation modification of nano-zirconium phosphate loaded with zinc by cetyltrimethylammonium bromide, thereby reducing the agglomeration of nano-zirconium phosphate loaded with zinc and improving the dispersibility of nano-zirconium phosphate loaded with zinc in the composite antibacterial agent system.

[0051] In Examples 6 and 7-11, the antibacterial rates of the antibacterial plastic alloys of Examples 7-11 on Staphylococcus aureus and Escherichia coli are higher than those of Example 6; it shows that the addition of nano-chitosan and decyl dimethyl chloride in the composite antibacterial agent raw material can further improve the antibacterial property of the antibacterial plastic alloy. It may be related to that nano-chitosan can adsorb decyl dimethyl chloride to the folds of the bacterial membrane, increase the local concentration of decyl dimethyl chloride, and be more conducive to the destruction of the cell membrane; and nano-chitosan and decyl dimethyl chloride are both through the superposition of positive charges, nano-chitosan can promote decyl dimethyl chloride to penetrate into the inside of the cell membrane, which can enhance the adsorption and penetration of the cell membrane, accelerate the rupture of the cell membrane, and further improve the antibacterial property of the antibacterial plastic alloy.

[0052] In Examples 7-11, the antibacterial rates of the antibacterial plastic alloys of Examples 8-10 on Staphylococcus aureus and Escherichia coli are 99.96-99.97% and 99.93-99.94% respectively, which are higher than those of Examples 7 and 11; it shows that when the weight ratio of nano-chitosan to decyl dimethyl chloride is 1:(2-3), the antibacterial property of the antibacterial plastic alloy can be further improved. It may be related to that adjusting the weight ratio of nano-chitosan to decyl dimethyl chloride can further improve the antibacterial properties of nano-chitosan and decyl dimethyl chloride, thereby improving the antibacterial property of the antibacterial plastic alloy.

[0053] The antibacterial rates of the antibacterial plastic alloys of Examples 12-16 against Staphylococcus aureus and Escherichia coli are higher than those of Examples 8-10, indicating that the addition of sulfonated chitosan and nanochitosan in the composite antibacterial agent raw material can further improve the antibacterial property of the antibacterial plastic alloy. It is possible that the sulfonic acid groups of chitosan and the amino groups of nanochitosan can form polyelectrolyte complexes through electrostatic attraction, enhance the adsorption capacity to bacterial cell membranes, and nanochitosan directly destroys the membrane integrity, and sulfonated chitosan interferes with the ion balance of the membrane, the combination of the two can promote the penetration efficiency of sulfonated chitosan and nanochitosan, thereby improving the antibacterial property of the composite antibacterial agent, and further improving the antibacterial property of the antibacterial plastic alloy.

[0054] In Examples 12-16, the antibacterial rates of the antibacterial plastic alloys of Examples 13-15 against Staphylococcus aureus and Escherichia coli are 99.99%, 99.96-99.97%, respectively, which are higher than those of Examples 12 and 16, indicating that the content of sulfonated chitosan in the composite antibacterial agent of Examples 13-15 is more appropriate, which can further improve the antibacterial property of the antibacterial plastic alloy.

[0055] In addition, according to the data of various indicators of the antibacterial plastic alloys of Comparative Examples 1-5 and Example 1, it is found that the addition of nanometer zirconium phosphate loaded with zinc, carbon nanotubes, decyl dimethyl ammonium chloride, polyhexamethylene biguanide and sodium dodecyl sulfate in the antibacterial plastic alloy raw material can improve the antibacterial property of the antibacterial plastic alloy to different degrees.

[0056] The specific embodiments are only an explanation of the present application, and are not a limitation of the present application. Those skilled in the art can make modifications to the embodiments without creative contribution after reading the present specification, as long as the modifications are within the scope of the claims of the present application.

Claims

1. An antibacterial plastic alloy used in baby products, characterized in that: Based on the total mass of the antibacterial plastic alloy, it includes the following raw materials in parts by weight: 70-90 parts of resin material, 1-3 parts of lubricant, 1-2 parts of compatibilizer, 1-3 parts of catalyst, 1-6 parts of toughening agent, 0.1-10 parts of composite antibacterial agent, and 0.5-2 parts of antioxidant; The resin material is selected from one or more of polycarbonate, acrylonitrile-butadiene-styrene copolymer, polybutylene terephthalate, polyamide, polyoxymethylene, polyphenylene ether, polyvinyl chloride, polyethylene, polypropylene, and polystyrene; Based on the total mass of the composite antibacterial agent, the composite antibacterial agent includes the following raw materials in parts by weight: 20-30 parts of nano-zirconium phosphate-loaded zinc, 1-3 parts of carbon nanotubes, 5-10 parts of polyhexamethylene biguanide, 5-10 parts of decyldimethylammonium chloride, and 0.5-1 part of sodium lauryl sulfate.

2. The antibacterial plastic alloy for baby products according to claim 1, characterized in that: Based on the total mass of the antibacterial plastic alloy, the antibacterial plastic alloy includes the following raw materials in parts by weight: 75-85 parts of resin material, 1.5-2.5 parts of lubricant, 1.3-1.8 parts of compatibilizer, 1.2-2.5 parts of catalyst, 2-5 parts of toughening agent, 1-3 parts of composite antibacterial agent, and 0.6-1.5 parts of antioxidant; Based on the total mass of the composite antibacterial agent, the composite antibacterial agent includes the following raw materials in parts by weight: 23-27 parts of nano-zirconium phosphate-supported zinc, 1.5-2.5 parts of carbon nanotubes, 7-9 parts of polyhexamethylene biguanide, 7-9 parts of decyldimethylammonium chloride, and 0.7-0.9 parts of sodium lauryl sulfate.

3. The antibacterial plastic alloy for baby products according to claim 1, characterized in that: The weight ratio of the carbon nanotubes to the nano zirconium phosphate-supported zinc is 1:(15-25).

4. The antibacterial plastic alloy for baby products according to claim 1, characterized in that: The nano zirconium phosphate loaded zinc is prepared by modification, specifically: S1. Add cetyltrimethylammonium bromide to water, mix, and stir evenly to obtain a cetyltrimethylammonium bromide solution; S2. Add the nano-zirconium phosphate loaded zinc to water, perform ultrasonic dispersion, add 50% n-propylamine aqueous solution, stir at 23±2°C for 22-24h, centrifuge, wash, and dry to obtain the pretreated nano-zirconium phosphate loaded zinc; S3, adding the pretreated nano-zirconium phosphate loaded with zinc to water, adding cetyltrimethylammonium bromide solution, stirring at 40-50° C. for 12-14 hours, centrifuging, washing, drying, and calcining to obtain modified nano-zirconium phosphate loaded with zinc; The volume ratio of the hexadecyltrimethylammonium bromide to water is 1:(40-50); the volume ratio of the nano-zirconium phosphate-supported zinc to water is 1:(90-100); the volume ratio of the 50% n-propylamine aqueous solution to the nano-zirconium phosphate-supported zinc is 1:(1-2); and the mass ratio of the hexadecyltrimethylammonium bromide to the nano-zirconium phosphate-supported zinc is 1:(1.5-2.5).

5. The antibacterial plastic alloy for baby products according to claim 1, characterized in that: The composite antibacterial agent further comprises the following raw materials in parts by weight: 1-5 parts of nano-chitosan.

6. The antibacterial plastic alloy for baby products according to claim 5, characterized in that: The weight ratio of the nano-chitosan to decyldimethylammonium chloride is 1:(2-3).

7. The antibacterial plastic alloy for baby products according to claim 1, characterized in that: The composite antibacterial agent further comprises the following raw materials in parts by weight: 5-15 parts of sulfonated chitosan.

8. A method for preparing the antibacterial plastic alloy for use in infant and child products according to any one of claims 1 to 7, characterized in that: The following steps are included: S1. First, the resin material is dried at 80-90° C. for 3-4 hours, and after drying, the composite antibacterial agent and the remaining raw materials are added to obtain a material; S2. The materials obtained in step S1 are blended and melted, extruded, granulated, and dried to obtain an antibacterial plastic alloy.

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