Antibacterial master batch using recycled waste PP as carrier and preparation method of antibacterial master batch

Abstract

The invention discloses an antibacterial master batch using recycled waste PP (polypropylene) as a carrier. The antibacterial master batch comprises the following components in parts by weight: 46-89.4 parts of recycled waste PP; 10-45 parts of a composite antibacterial agent; 0.2 to 2.5 parts of a first dispersant; 0.2 to 2.5 parts of a first lubricant; 0.2 to 4.0 parts of a first antioxidant; on the basis of the components, the invention further provides a preparation method of the antibacterial master batch using the recycled waste PP as the carrier. Through the mode, the recycled waste polypropylene can be used as a carrier of the high-performance master batch to endow the high-performance master batch with antibacterial properties of broad bactericidal spectrum, strong bactericidal effect and excellent durability, the raw material cost can be greatly reduced, the resource circulation of the waste plastic is realized, and the high-performance master batch has both economic benefits and environmental benefits.

Description

Technical Field

[0001] This invention relates to the field of polymer materials technology, and in particular to an antibacterial masterbatch using recycled waste PP as a carrier and its preparation method. Background Technology

[0002] Polypropylene (PP), as one of the five major general-purpose plastics, accounts for approximately 30% of the total consumption of synthetic resins and is the fastest-growing plastic variety. Due to its comprehensive advantages such as easy processing, high impact strength, excellent flexural strength, and superior electrical insulation, it is widely used in numerous fields including the automotive industry, home appliances, electronics, packaging, building materials, and furniture. With the development of the times, the consumption structure of polypropylene is undergoing a profound transformation from traditional application areas to broader, higher-end, and more personalized end-markets. However, this shift in the application of polypropylene materials is accompanied by two prominent issues: First, polypropylene itself is prone to bacterial growth, posing a health and safety hazard: As an organic polymer material, polypropylene easily accumulates pollutants on its surface and forms a slippery biofilm during use, providing a breeding ground for microorganisms to attach and multiply. This phenomenon not only leads to the material itself being eroded and deteriorated by microorganisms, but more importantly, in application scenarios such as medical devices, food packaging, and public facilities, it can easily cause cross-infection and disease transmission, posing a serious threat to public health.

[0003] Second, large-scale polypropylene production and consumption have generated a large amount of polypropylene waste, posing a serious environmental challenge: if these waste polypropylenes cannot be recycled efficiently and sustainably, it will cause serious white pollution and resource waste, severely restricting the green and sustainable development of the polypropylene industry.

[0004] To address the aforementioned issue of easy bacterial growth in polypropylene, existing technologies employ the addition of antibacterial agents. However, currently used antibacterial agents have significant limitations: narrow bactericidal spectrum, low antibacterial efficiency leading to large dosages, short antibacterial duration, and high cost, making it difficult to meet market demands for efficient, long-lasting, and broad-spectrum antibacterial performance. Meanwhile, regarding the recycling of polypropylene, although the technology itself exists, how to apply recycled materials in a high-value manner to products with specific performance requirements remains a technical challenge. Summary of the Invention

[0005] Based on the above market research, the main technical problem solved by this invention is to provide an antibacterial masterbatch using recycled waste PP as a carrier and its preparation method. This method can use recycled waste polypropylene as a carrier for high-performance masterbatch, giving it broad-spectrum bactericidal properties, strong bactericidal effect, and excellent durability. It can also significantly reduce raw material costs, realize the resource recycling of waste plastics, and has both economic and environmental benefits, thus having a good prospect for technology promotion.

[0006] To solve the above-mentioned technical problems, one technical solution adopted by the present invention is: to provide an antibacterial masterbatch using recycled waste PP as a carrier, which is composed of the following components and their weight ratios: Recycle 46-89.4 parts of waste polypropylene (PP); 10-45 parts of compound antibacterial agent; The first dispersant is 0.2 to 2.5 parts; First lubricant: 0.2 to 2.5 parts; First antioxidant 0.2 ~ 4.0 parts.

[0007] Preferably, the sources of the recycled waste polypropylene (PP) include waste generated during the polymerization reaction, scraps generated during molding and processing, and waste generated after the polypropylene is used.

[0008] Preferably, the recycling of waste polypropylene (PP) requires ash impurities <0.5%, moisture content <0.2%, melt flow index fluctuation range <0.5 / 10MIN, and tensile strength >10MPa, and is then processed into powder with a particle size of 5~50um for later use.

[0009] Preferably, the composite antibacterial agent is composed of the following components and their weight ratios: Inorganic antibacterial agent A, 10-15 parts; Inorganic antibacterial agent B, 20-30 parts; Organometallic antibacterial agent C, 20-30 parts; Recycle 16 to 49.4 parts of waste polypropylene (PP); The second dispersant is 0.2 to 2.5 parts; Second lubricant: 0.2 to 2.5 parts; Second antioxidant 0.2 to 4 parts.

[0010] Preferably, the inorganic antibacterial agent A is IONPURE IPL from Ishizuka Glass Co., Ltd.; the inorganic antibacterial agent B is Busan 11-M1 from Buckman Co., Ltd.; and the organometallic antibacterial agent C is AM002ZP from Basston Co., Ltd.

[0011] Preferably, the first dispersant and the second dispersant are made of the same material, namely fatty acid soaps, fatty acid esters or fatty amides, with a melting point between 50-150℃.

[0012] Preferably, the first and second lubricants are made of the same material, such as polyethylene wax, paraffin wax, fatty acids or fatty alcohols, with a melting point between 50-150℃.

[0013] Preferably, the first antioxidant and the second antioxidant are made from the same materials, specifically p-phenylenediamine, diaryl secondary amine, aldehyde amine, or ketone amine, which are phenolic acrylate or amine compounds.

[0014] To solve the above-mentioned technical problems, another technical solution adopted by the present invention is: to provide a method for preparing antibacterial masterbatch using recycled waste PP as a carrier, comprising the following steps: (1) The recycled waste polypropylene (PP) is cleaned, sorted and impurities are removed so that the ash content of the recycled waste polypropylene (PP) is <0.5%, the moisture content is <0.2%, the melt flow index fluctuation range is <0.5 / 10MIN, and the tensile strength is >10MPa. (2) Next, the processed recycled waste polypropylene (PP) is crushed into small pieces by a crusher and then ground into powder with a particle size of 5~50um by a grinding mill for use. (3) Weigh out inorganic antibacterial agent A, inorganic antibacterial agent B, organometallic antibacterial agent C, recycled waste polypropylene PP, second dispersant, second lubricant and second antioxidant according to the weight parts, add all components into the mixer, and mix at 100~200 rpm for 3~45 minutes, while heating to 200~220℃. (4) After mixing, take it out and cool it, crush it into small pieces with a crusher, and then grind it into a powdered composite antibacterial agent with a particle size of 5~50UM using a grinding mill; (5) Next, weigh out the recycled waste polypropylene (PP), composite antibacterial agent, first dispersant, first lubricant and first antioxidant according to the weight proportions; (6) Add the components weighed in step (5) to the mixer and stir at 200-300 rpm for 10-15 minutes. After stirring, the mixture is extruded through a twin-screw extruder. (7) After extrusion, the product is cooled in a water tank and then pelletized by a pelletizer to obtain the final antibacterial masterbatch product using recycled waste PP as a carrier. The relevant performance tests are then carried out.

[0015] Preferably, in step (6) above, the twin-screw extrusion adopts an electro-hydraulic system with eight heating zones, and the heating temperature of the first zone is between 150 and 160°C, the heating temperature of the second zone is between 160 and 170°C, the heating temperature of the third zone is between 170 and 180°C, the heating temperature of the fourth zone is between 180 and 190°C, the heating temperature of the fifth zone is between 190 and 200°C, the heating temperature of the sixth zone is between 200 and 210°C, the heating temperature of the seventh zone is between 210 and 220°C, and the heating temperature of the eighth zone is between 220 and 230°C.

[0016] The beneficial effects of this invention are: This invention addresses the growing use of polypropylene (PP), the large amount of waste generated, and the shifting applications of existing technologies, as well as the inherent characteristics that make it prone to bacterial growth. It also aligns with the current national strategic requirements for green recycling and sustainable development of materials. Extensive technical research and investigation have led to the successful development of an antibacterial masterbatch and its preparation process that utilizes recycled waste PP as a carrier. Through component exploration and control of preparation conditions, the invention achieves two key benefits: firstly, it recycles waste PP, reducing raw material costs associated with virgin material processing; secondly, the prepared product exhibits a broad bactericidal spectrum, strong bactericidal effect, stable and long-lasting bactericidal efficacy, and high durability, while retaining its excellent mechanical properties. Its performance is comparable to antibacterial masterbatches prepared from virgin materials, demonstrating the substitutability of the materials obtained by this invention. Furthermore, the entire processing technology is simple and controllable, easily implemented in large-scale workshop production, and aligns with the current national green and environmental protection principles, making it highly valuable for technology promotion. Detailed Implementation

[0017] The preferred embodiments of the present invention will now be described in detail so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby providing a clearer and more explicit definition of the scope of protection of the present invention.

[0018] Example 1: An antibacterial masterbatch using recycled waste PP as a carrier has the following components and their weight parts as follows: 86.9 parts recycled waste polypropylene (PP), 10 parts composite antibacterial agent, 0.8 parts dispersant SODIUM STEARATE APS, 0.8 parts lubricant LICOWAXPE 520, and 1.5 parts antioxidant IRG 1010.

[0019] The above-mentioned dispersant SODIUM STEARATE APS was purchased from Zhejiang Kelong Plastics Co., Ltd. The aforementioned lubricant, LICOWAX PE 520, was purchased from Clariant. The antioxidant IRG 1010 mentioned above was purchased from BASF.

[0020] The sources of the aforementioned recycled waste polypropylene (PP) include waste generated during polymerization reactions, scraps generated during molding and processing, or waste generated after the use of polypropylene.

[0021] The above-mentioned recycling process for waste polypropylene (PP) includes at least cleaning, sorting, and impurity removal. The treated waste PP is required to have an ash content of <0.5%, a moisture content of <0.2%, a melt flow index fluctuation range of <0.5 / 10MIN, and a tensile strength of >10MPa. The treated recycled waste PP is crushed into small pieces by a crusher and then ground into powder with a particle size of 5~50um by a grinding mill for later use.

[0022] The above-mentioned composite antibacterial agent was obtained by selecting 12 parts of Ishizuka Glass Co., Ltd.'s IONPURE IPL, 25 parts of Bassin Co., Ltd.'s AM002ZP, 25 parts of Buckman Co., Ltd.'s Busan 11-M1, 2 parts of dispersant, 2 parts of lubricant, 2 parts of antioxidant, and 32 parts of recycled waste polypropylene (PP) prepared above. The dispersant, lubricant, antioxidant, and other components used in the above-mentioned antibacterial masterbatch were sourced from the same manufacturers. Ishizuka Glass Co., Ltd.'s IONPURE IPL has a heat resistance of approximately 500℃, far exceeding the processing temperature of PP, allowing it to fully exert its antibacterial effect in PP materials. Furthermore, it exerts its antibacterial effect through the slow release of metallic silver ions. Bassin's antibacterial agent AM002ZP has an active ingredient with a heat resistance >240℃ and exhibits broad-spectrum antibacterial activity. Its differentiated combination with the above-mentioned IONPURE IPL antibacterial agent ensures that it is not consumed while killing bacteria, resulting in a more timely bactericidal effect. Simultaneously, it is combined with Buckman's Busan... 11-M1 inorganic antibacterial agent improves the rigidity and heat resistance of PP materials while imparting antibacterial effects.

[0023] The components for preparing the composite antibacterial agent are added to a mixer and stirred at 150 rpm for 30 minutes, while simultaneously heating to 210°C, ensuring all components are thoroughly and uniformly mixed. The mixture is then removed and cooled, crushed into small pieces using a crusher, and then ground into a powder with a particle size range of 5-50 μm using a grinding mill. This method of preparing the composite antibacterial agent separately followed by the preparation of antibacterial masterbatch, on the one hand, utilizes a closed environment for heating and mixing, significantly reducing dust leakage during subsequent use; on the other hand, the mechanical shearing, extrusion, and kneading actions achieve uniform mixing of the materials, ensuring uniform and stable antibacterial performance.

[0024] Prepare the recycled waste polypropylene (PP), composite antibacterial agent, dispersant SODIUMSTEARATE APS, lubricant LICOWAX PE 520, and antioxidant IRG according to the above weight ratio. After step 1010, the mixture is added to a mixer and stirred at 250 rpm for 15 minutes. After stirring, the mixture is extruded through a twin-screw extruder. The temperature is set in stages. The temperature of the feeding stage is set slightly lower to prevent the material from melting too early and causing melt backflow. The temperature of the middle stage ensures that the material is fully plasticized and that the various components are fully fused and uniform. The temperature of the last stage is to prevent the melt from cooling and clogging the die head, and it should not be too high to cause material decomposition. Based on the above considerations, the heating temperature of the first stage is 150-160℃, the second stage is 160-170℃, the third stage is 170-180℃, the fourth stage is 180-190℃, the fifth stage is 190-200℃, the sixth stage is 200-210℃, the seventh stage is 210-220℃, and the eighth stage is 220-230℃. After extrusion, the mixture is cooled in a water tank and then pelletized by a pelletizer to obtain the antibacterial masterbatch product using recycled waste PP as a carrier in this embodiment.

[0025] Example 2: An antibacterial masterbatch using recycled waste PP as a carrier has the following composition and weight ratio: 81.9 parts recycled waste PP, 15 parts composite antibacterial agent, 0.8 parts dispersant SODIUM STEARATE APS, 0.8 parts lubricant LICOWAX PE 520, and 1.5 parts antioxidant IRG 1010.

[0026] Other processing conditions and processing steps are the same as in Example 1.

[0027] Example 3: An antibacterial masterbatch using recycled waste PP as a carrier has the following composition and weight ratio: 76.9 parts recycled waste PP, 20 parts composite antibacterial agent, 0.8 parts dispersant SODIUM STEARATE APS, 0.8 parts lubricant LICOWAX PE 520, and 1.5 parts antioxidant IRG 1010.

[0028] Other processing conditions and processing steps are the same as in Example 1.

[0029] Example 4: An antibacterial masterbatch using recycled waste PP as a carrier has the following composition and weight ratio: 71.9 parts recycled waste PP, 25 parts composite antibacterial agent, 0.8 parts dispersant SODIUM STEARATE APS, 0.8 parts lubricant LICOWAX PE 520, and 1.5 parts antioxidant IRG 1010.

[0030] Other processing conditions and processing steps are the same as in Example 1.

[0031] Example 5: An antibacterial masterbatch using recycled waste PP as a carrier has the following composition and weight ratio: 66.9 parts recycled waste PP, 30 parts composite antibacterial agent, 0.8 parts dispersant SODIUM STEARATE APS, 0.8 parts lubricant LICOWAX PE 520, and 1.5 parts antioxidant IRG 1010.

[0032] Other processing conditions and processing steps are the same as in Example 1.

[0033] Example 6: An antibacterial masterbatch using recycled waste PP as a carrier has the following composition and weight ratio: 61.9 parts recycled waste PP, 35 parts composite antibacterial agent, 0.8 parts dispersant SODIUM STEARATE APS, 0.8 parts lubricant LICOWAX PE 520, and 1.5 parts antioxidant IRG 1010.

[0034] Other processing conditions and processing steps are the same as in Example 1.

[0035] Example 7: An antibacterial masterbatch using recycled waste PP as a carrier has the following composition and weight ratio: 56.9 parts recycled waste PP, 40 parts composite antibacterial agent, 0.8 parts dispersant SODIUM STEARATE APS, 0.8 parts lubricant LICOWAX PE 520, and 1.5 parts antioxidant IRG 1010.

[0036] Other processing conditions and processing steps are the same as in Example 1.

[0037] Example 8: An antibacterial masterbatch using recycled waste PP as a carrier has the following composition and weight ratio: 51.9 parts recycled waste PP, 45 parts composite antibacterial agent, 0.8 parts dispersant SODIUM STEARATE APS, 0.8 parts lubricant LICOWAX PE 520, and 1.5 parts antioxidant IRG 1010.

[0038] Other processing conditions and processing steps are the same as in Example 1.

[0039] The antibacterial masterbatch products prepared in Examples 1-8 above were used to injection mold 50mm*75mm*3mm color samples in polypropylene PP S2040 at a dosage of 5% for antibacterial long-term performance testing. The color samples were placed in an environment with a temperature of 60℃ and a humidity of 90% for 7 days and 14 days respectively, and then antibacterial performance tests were conducted. The test data are as follows: Meanwhile, to demonstrate the intuitiveness of the technical effects, the following 14 comparative examples were conducted under the same processing conditions: Comparative Example 1: The carrier of the antibacterial masterbatch was replaced with a new polypropylene SECCO S2040 (purchased from Shanghai SECCO), whose components and weight ratios are as follows: 86.9 parts of polypropylene PP SECCO S2040, 10 parts of composite antibacterial agent, 0.8 parts of dispersant SODIUM STEARATE APS, 0.8 parts of lubricant LICOWAX PE 520, and 1.5 parts of antioxidant IRG 1010.

[0040] Other processing conditions and processing steps are the same as in Example 1.

[0041] Comparative Example 2: The carrier of the antibacterial masterbatch was replaced with a new polypropylene SECCO S2040 (purchased from Shanghai SECCO), and its composition and weight ratio are as follows: 81.9 parts of polypropylene PP SECCO S2040, 15 parts of composite antibacterial agent, 0.8 parts of dispersant SODIUM STEARATE APS, 0.8 parts of lubricant LICOWAX PE 520, and 1.5 parts of antioxidant IRG 1010.

[0042] Other processing conditions and processing steps are the same as in Example 1.

[0043] Comparative Example 3: The carrier of the antibacterial masterbatch was replaced with a new polypropylene SECCO S2040 (purchased from Shanghai SECCO), and its composition and weight ratio are as follows: 76.9 parts of polypropylene PP SECCO S2040, 20 parts of composite antibacterial agent, 0.8 parts of dispersant SODIUM STEARATE APS, 0.8 parts of lubricant LICOWAX PE 520, and 1.5 parts of antioxidant IRG 1010.

[0044] Other processing conditions and processing steps are the same as in Example 1.

[0045] Comparative Example 4: The carrier of the antibacterial masterbatch was replaced with a new polypropylene SECCO S2040 (purchased from Shanghai SECCO), and its composition and weight ratio are as follows: 71.9 parts of polypropylene PP SECCO S2040, 25 parts of composite antibacterial agent, 0.8 parts of dispersant SODIUM STEARATE APS, 0.8 parts of lubricant LICOWAX PE 520, and 1.5 parts of antioxidant IRG 1010.

[0046] Other processing conditions and processing steps are the same as in Example 1.

[0047] Comparative Example 5: The carrier of the antibacterial masterbatch was replaced with a new polypropylene SECCO S2040 (purchased from Shanghai SECCO), and its composition and weight ratio are as follows: 66.9 parts of polypropylene PP SECCO S2040, 30 parts of composite antibacterial agent, 0.8 parts of dispersant SODIUM STEARATE APS, 0.8 parts of lubricant LICOWAX PE 520, and 1.5 parts of antioxidant IRG 1010.

[0048] Other processing conditions and processing steps are the same as in Example 1.

[0049] Comparative Example 6: The carrier of the antibacterial masterbatch was replaced with a new polypropylene SECCO S2040 (purchased from Shanghai SECCO), and its composition and weight ratio are as follows: 61.9 parts of polypropylene PP SECCO S2040, 35 parts of composite antibacterial agent, 0.8 parts of dispersant SODIUM STEARATE APS, 0.8 parts of lubricant LICOWAX PE 520, and 1.5 parts of antioxidant IRG 1010.

[0050] Other processing conditions and processing steps are the same as in Example 1.

[0051] Comparative Example 7: The carrier of the antibacterial masterbatch was replaced with a new polypropylene SECCO S2040 (purchased from Shanghai SECCO), and its composition and weight ratio are as follows: 56.9 parts of polypropylene PP SECCO S2040, 40 parts of composite antibacterial agent, 0.8 parts of dispersant SODIUM STEARATE APS, 0.8 parts of lubricant LICOWAX PE 520, and 1.5 parts of antioxidant IRG 1010.

[0052] Other processing conditions and processing steps are the same as in Example 1.

[0053] Comparative Example 8: The carrier of the antibacterial masterbatch was replaced with a new polypropylene SECCO S2040 (purchased from Shanghai SECCO), and its composition and weight ratio are as follows: 51.9 parts of polypropylene PP SECCO S2040, 45 parts of composite antibacterial agent, 0.8 parts of dispersant SODIUM STEARATE APS, 0.8 parts of lubricant LICOWAX PE 520, and 1.5 parts of antioxidant IRG 1010.

[0054] Other processing conditions and processing steps are the same as in Example 1.

[0055] Comparative Example 9: Its components and weight ratios are as follows: 95.9 parts recycled waste polypropylene (PP), 1 part antibacterial agent JC-85-G, 0.8 parts dispersant SODIUM STEARATE APS, 0.8 parts lubricant LICOWAX PE 520, and 1.5 parts antioxidant IRG 1010.

[0056] Other processing conditions and processing steps are the same as in Example 1.

[0057] Comparative Example 10: Its components and weight ratios are as follows: 94.9 parts recycled waste polypropylene (PP), 2 parts antibacterial JC-85-G, 0.8 parts dispersant SODIUM STEARATE APS, 0.8 parts lubricant LICOWAX PE 520, and 1.5 parts antioxidant IRG 1010.

[0058] Other processing conditions and processing steps are the same as in Example 1.

[0059] Comparative Example 11: Its components and weight ratios are as follows: 94.9 parts recycled waste polypropylene (PP), 1 part antibacterial agent JC-85-G, 1 part antibacterial agent ZPT98, 0.8 parts dispersant SODIUM STEARATE APS, 0.8 parts lubricant LICOWAX PE 520, and 1.5 parts antioxidant IRG 1010.

[0060] Other processing conditions and processing steps are the same as in Example 1.

[0061] Comparative Example 12: Its components and weight ratios are as follows: 92.9 parts recycled waste polypropylene (PP), 2 parts antibacterial agent JC-85-G, 2 parts antibacterial agent ZPT98, 0.8 parts dispersant SODIUM STEARATE APS, 0.8 parts lubricant LICOWAX PE 520, and 1.5 parts antioxidant IRG 1010.

[0062] Other processing conditions and processing steps are the same as in Example 1.

[0063] Comparative Example 13: Its components and weight ratios are as follows: 93.9 parts recycled waste polypropylene (PP), 1 part antibacterial agent JC-85-G, 1 part antibacterial agent ZPT98, 1 part antibacterial agent KP-J151, 0.8 parts dispersant SODIUM STEARATE APS, 0.8 parts lubricant LICOWAX PE520, and 1.5 parts antioxidant IRG 1010.

[0064] Other processing conditions and processing steps are the same as in Example 1.

[0065] Comparative Example 14: Its components and weight ratios are as follows: 90.9 parts recycled waste polypropylene (PP), 2 parts antibacterial agent JC-85-G, 2 parts antibacterial agent ZPT98, 2 parts antibacterial agent KP-J151, 0.8 parts dispersant SODIUM STEARATE APS, 0.8 parts lubricant LICOWAX PE520, and 1.5 parts antioxidant IRG 1010.

[0066] Other processing conditions and processing steps are the same as in Example 1.

[0067] The antibacterial particles obtained in Comparative Examples 1-14 were also injection molded into color samples of 50mm*75mm*3mm as in the examples above for antibacterial long-term performance testing: the color samples were placed in an environment with a temperature of 60℃ and a humidity of 90% for 7 days and 14 days respectively, and then antibacterial performance tests were conducted. The corresponding test data are shown in the table below: The performance tests in Examples 1-8 show that the antibacterial masterbatch prepared by the present invention using recycled waste polypropylene (PP) as a carrier exhibits an antibacterial rate of 98.5%-99.9% against Staphylococcus aureus and 98.2%-99.9% against Escherichia coli. After 7 days, the antibacterial performance was retested, with an antibacterial rate of 96.6%-98.1% against Staphylococcus aureus and 96.3%-98.1% against Escherichia coli. After 14 days, the antibacterial performance was retested again, with an antibacterial rate of 94.7%-96.2% against Staphylococcus aureus and 94.4%-96.2% against Escherichia coli. It can be seen that the antibacterial performance of the product did not change significantly over time, indicating that the antibacterial masterbatch prepared by the present invention using recycled waste polypropylene (PP) as a carrier has excellent long-lasting antibacterial properties. Furthermore, it can be seen that the product prepared by the present invention, while achieving the above-mentioned excellent antibacterial properties, does not suffer any impact on its mechanical properties and remains excellent.

[0068] Further analysis of the performance test data from Comparative Examples 1-8 shows that the antibacterial masterbatch prepared using virgin SECCO polypropylene PP S2040 as a carrier exhibits an antibacterial rate of 98.6%-99.9% against Staphylococcus aureus and 98.3%-99.9% against Escherichia coli. Compared to the antibacterial masterbatch prepared using recycled waste polypropylene PP as a carrier in this invention, its antibacterial effect is essentially the same as that of the antibacterial masterbatch prepared using virgin material as a carrier, while its mechanical properties are not affected. This sufficiently demonstrates the high feasibility of the present invention and its performance is consistent with that of directly using virgin material.

[0069] Further analysis of the performance test data from Comparative Examples 9-14 reveals that the antibacterial rate against Staphylococcus aureus ranges from 75.8% to 91%, and the antibacterial rate against Escherichia coli ranges from 75.6% to 91%. It is evident that the antibacterial effects of the products in Comparative Examples 9-14 that used other single or compound antibacterial agents are significantly inferior to those of the antibacterial masterbatch of this invention.

[0070] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. An antibacterial master batch using recycled waste PP as a carrier, characterized in that, It is composed of the following components and their weight ratio: Recycled waste polypropylene PP 46 ~ 89.4 parts; Composite antimicrobial agent 10 ~ 45 parts; First dispersant 0.2 ~ 2.5 parts; First lubricant 0.2 ~ 2.5 parts; First antioxidant 0.2 ~ 4.0 parts.

2. The antibacterial master batch with recycled waste PP as carrier according to claim 1, characterized in that: The source of the recycled waste polypropylene PP includes waste generated during polymerization, scrap generated during molding, and waste generated after use of polypropylene.

3. The antibacterial master batch with recycled waste PP as carrier according to claim 1, characterized in that: The processing requirements of the recycled waste polypropylene PP are ash impurities <0.5%, moisture content <0.2%, melt index fluctuation range <0.5 / 10 MIN, tensile strength >10 MPa, and further processing into powder particles with a particle size of 5~50um for standby.

4. The antibacterial master batch with recycled waste PP as carrier according to claim 1, characterized in that: The composite antimicrobial agent is composed of the following components and their weight ratio: Inorganic antimicrobial agent A 10 ~ 15 parts; Inorganic antimicrobial agent B 20 ~ 30 parts; Organometallic antimicrobial agent C 20 ~ 30 parts; Recycled waste polypropylene PP 16 ~ 49.4 parts; Second dispersant 0.2 ~ 2.5 parts; Second lubricant 0.2 ~ 2.5 parts; Second antioxidant 0.2 ~ 4 parts.

5. The antibacterial master batch with recycled waste PP as carrier according to claim 4, characterized in that: The inorganic antimicrobial agent A is selected from IONPURE IPL of Ishizuka Glass Co., Ltd.; the inorganic antimicrobial agent B is selected from Busan11-M1 of Bakellman Company, and the organometallic antimicrobial agent C is selected from AM002ZP of BASF.

6. The antibacterial master batch with recycled waste PP as carrier according to claim 1 or 4, characterized in that: The first dispersant and the second dispersant are selected from the same material, which is selected from fatty acid soap, fatty acid ester, or fatty amide, with a melting point of 50-150℃.

7. The antibacterial master batch with recycled waste PP as carrier according to claim 1 or 4, characterized in that: The first lubricant and the second lubricant are selected from the same material, which is selected from polyethylene wax, paraffin, fatty acid, or fatty alcohol, with a melting point of 50-150℃.

8. The antibacterial master batch with recycled waste PP as carrier according to claim 1 or 4, characterized in that: The first antioxidant and the second antioxidant are selected from the same material, which is selected from p-phenylenediamine, diaryl secondary amine, aldehyde amine, and ketone amine.

9. A method for preparing the antibacterial master batch using recycled waste PP as carrier according to any one of claims 1-8, characterized in that, It includes the following steps: (1) The recycled waste polypropylene PP is cleaned, classified, and impurity-removed, so that the ash impurities in the treated recycled waste polypropylene PP are <0.5%, the moisture content is <0.2%, the melt index fluctuation range is <0.5 / 10 MIN, and the tensile strength is >10 MPa; (2) Then the treated recycled waste polypropylene PP is crushed into small pieces with a crusher, and then ground into powder with a particle size of 5~50um with a powder mill; (3) According to the weight fraction, inorganic antimicrobial agent A, inorganic antimicrobial agent B, organometallic antimicrobial agent C, recycled waste polypropylene PP, second dispersant, second lubricant, and second antioxidant are weighed and added to the mixing machine, and stirred at 100~200 revolutions / minute for 3~45 minutes for mixing, while heating to 200~220℃; (4) After mixing, take out and cool, crush into small pieces with a crusher, and then grind into powder with a particle size of 5~50UM with a powder mill; (5) Then, according to the weight fraction, the recycled waste polypropylene PP, the composite antimicrobial agent, the first dispersant, the first lubricant, and the first antioxidant are weighed. (6) The components weighed in step (5) are added to a blender, and stirred at 200-300 rpm for 10-15 minutes. The mixed material is then extruded through a twin-screw extruder; (7) After extrusion, the product is cooled in a water tank and cut into particles by a granulator to obtain the final antibacterial master batch product using recycled waste PP as a carrier. Subsequent tests are performed to determine the relevant properties.

10. The method according to claim 9, wherein the method comprises the following steps: 1) mixing the waste PP with the carrier, and 2) mixing the waste PP with the carrier and the antibacterial agent. In the above step (6), the twin-screw extrusion uses an electric heating system with eight heating zones. The first heating zone has a temperature of 150-160°C, the second heating zone has a temperature of 160-170°C, the third heating zone has a temperature of 170-180°C, the fourth heating zone has a temperature of 180-190°C, the fifth heating zone has a temperature of 190-200°C, the sixth heating zone has a temperature of 200-210°C, the seventh heating zone has a temperature of 210-220°C, and the eighth heating zone has a temperature of 220-230°C.

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