A high-temperature resistant and antibacterial PET plastic cup material and its preparation method

Abstract

This invention provides a high-temperature resistant and antibacterial PET plastic cup material, prepared from the following components in parts by weight: 65-70 parts PET resin, 25-28 parts glass fiber, 0.8-1.2 parts nucleating agent, 0.6-1 part lubricant, 1-1.5 parts toughening agent, 0.5-0.8 parts antioxidant, 4-5 parts antibacterial agent, and 2-3 parts additives. This invention also provides a method for preparing this high-temperature resistant and antibacterial PET plastic cup material. The high-temperature resistant and antibacterial PET plastic cup material provided by this invention has good high-temperature resistance and antibacterial properties.

Description

Technical Field

[0001] This invention relates to a plastic cup material, and more particularly to a high-temperature resistant and antibacterial PET plastic cup material and its preparation method. Background Technology

[0002] PET (polyethylene terephthalate) is a thermoplastic polyester material widely used in the manufacture of cups, such as beverage bottles and disposable cold drink cups. Its chemical structure is formed by the condensation polymerization of terephthalic acid and ethylene glycol, exhibiting high crystallinity and symmetry. PET material is highly transparent, lightweight, and portable, with a smooth and glossy surface, making it commonly used in cold drink packaging to clearly display the contents. Physically, PET has a density of approximately 1.38 g / cm³, excellent mechanical strength, and is resistant to abrasion and deformation. However, PET material has limited high-temperature resistance; at excessively high temperatures, it can deform and release harmful substances (such as antimony, plasticizers, or benzo[a]pyrene), making it unsuitable for holding hot water, hot oil, or acidic foods (such as vinegar).

[0003] In terms of chemical stability, PET material is resistant to oils, dilute acids, dilute alkalis, and most solvents, but strong acids, alkalis, or water vapor may cause it to decompose. Regarding environmental friendliness, PET is recyclable (industrial recycling efficiency is high), but daily reuse can lead to aging and the release of microplastics or toxins; therefore, it is recommended to prioritize its use in single-use applications. PET material is non-toxic and odorless at room temperature, but high temperatures or repeated use increase the risk of harmful substance migration, and ordinary PET material has relatively weak antibacterial properties. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a high-temperature resistant and antibacterial PET plastic cup material, which has good high-temperature resistance and antibacterial properties.

[0005] To solve the above-mentioned technical problems, the technical solution of the present invention is as follows:

[0006] A high-temperature resistant and antibacterial PET plastic cup material is prepared from the following components in parts by weight: 65-70 parts PET resin, 25-28 parts glass fiber, 0.8-1.2 parts nucleating agent, 0.6-1 part lubricant, 1-1.5 parts toughening agent, 0.5-0.8 parts antioxidant, 4-5 parts antibacterial agent, and 2-3 parts additives.

[0007] Furthermore, the intrinsic viscosity of the PET resin described in this invention is 0.6 to 0.9 dL / g.

[0008] Furthermore, the glass fiber described in this invention is an alkali-free glass fiber with a single fiber diameter of 12-16 μm.

[0009] Furthermore, the nucleating agent of the present invention is talc powder with an average particle size of 1 to 5 μm.

[0010] Furthermore, the lubricant described in this invention is silicone powder with an average particle size of 10-20 μm.

[0011] Furthermore, the toughening agent of the present invention is composed of ethylene-methyl acrylate-glycidyl methacrylate and epoxy butyl furfuryl ester in a mass ratio of 3:1; the antioxidant is composed of antioxidant 1010 and antioxidant 168 in a mass ratio of 1:1.

[0012] Furthermore, the antibacterial agent of the present invention is prepared by the following steps:

[0013] (1) Dry the leaves of Bougainvillea for 1-2 hours, crush them and sieve them to obtain Bougainvillea leaf powder. Add the Bougainvillea leaf powder to an ethanol aqueous solution and soak it at 45°C for 12 hours to obtain an soaking solution.

[0014] (2) Place the soaking solution obtained in step (1) in an ultrasonic cleaner and extract it at 45°C for 50 minutes to obtain an extract. Filter the extract to obtain a filtrate. Distill the filtrate under reduced pressure to obtain a crude extract. Extract the crude extract with n-hexane and separate the liquids. After removing the n-hexane from the upper liquid by rotary evaporation, obtain the leaf extract of Bougainvillea.

[0015] (3) The leaf extract of Bougainvillea obtained in step (2) and 1-chloro-4-(chloromethoxy)butane were added to hexafluoroisopropanol, stirred until evenly mixed, and allowed to stand for 24 hours. After adding aluminum chloride, the mixture was stirred at room temperature for 1 hour. After heating to 45°C, the mixture was stirred for 6-8 hours to obtain the reactant. The reactant was washed three times with anhydrous ethanol and deionized water, and then transferred to a vacuum drying oven and vacuum dried to constant weight to obtain the antibacterial agent.

[0016] Further, in step (1) of the preparation of the antibacterial agent of the present invention, the drying temperature is 60°C, the particle size of the bougainvillea leaf powder is 60 mesh, the volume concentration of the ethanol aqueous solution is 80%, and the ratio of bougainvillea leaf powder to ethanol aqueous solution is 1g:10mL; in step (2), the ultrasonic extraction power is 250W, the ultrasonic extraction frequency is 40kHz, the vacuum distillation temperature is 50-60°C, and the vacuum distillation pressure is 40kPa; in step (3), the ratio of bougainvillea leaf extract, 1-chloro-4-(chloromethoxy)butane, hexafluoroisopropanol, and aluminum chloride is 6g:1g:50mL:1g, and the vacuum drying temperature is 60°C.

[0017] Furthermore, the auxiliary agent described in this invention is 3-hydroxyoxetane-3-carboxylic acid.

[0018] Another technical problem to be solved by the present invention is to provide a method for preparing the above-mentioned high-temperature resistant and antibacterial PET plastic cup material.

[0019] To solve the above technical problems, the technical solution is as follows:

[0020] A method for preparing a high-temperature resistant and antibacterial PET plastic cup material includes the following steps:

[0021] S1. Weigh each component according to the weight proportions, dry the PET resin at 120℃ for 4 hours, cool it to room temperature, and add it together with the other components except glass fiber into a mixer. Stir at 400-500 rpm for 40-50 minutes to obtain the mixture.

[0022] S2. Add the mixture obtained in step S1 to the main feed port of the twin-screw extruder, add the glass fiber to the side feed port of the twin-screw extruder, and granulate after melt extrusion to obtain high-temperature resistant and antibacterial PET plastic cup material; the main speed of the twin-screw extruder is 500 rpm, the length-to-diameter ratio is 36:1, the temperature of zone 1 is 250-260℃, the temperature of zone 2 is 265-275℃, the temperature of zone 3 is 270-285℃, the temperature of zone 4 is 285-290℃, the temperature of zone 5 is 275-285℃, the temperature of zone 6 is 260-275℃, and the temperature of zone 7 is 260-270℃.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1) The glass fiber used in this invention can form a three-dimensional network structure in the PET resin matrix, which effectively improves the high temperature resistance and impact resistance of PET plastic cup material.

[0025] 2) This invention obtains Bougainvillea leaf extract by sequentially drying, pulverizing, sieving, soaking in ethanol, ultrasonic-assisted extraction, filtration, vacuum distillation, extraction, separation, and rotary evaporation of Bougainvillea leaves. This extract contains antibacterial active ingredients and has good antibacterial properties. However, its heat resistance and compatibility with PET resin matrix are not good. To address this, this invention reacts Bougainvillea leaf extract with 1-chloro-4-(chloromethoxy)butane under the catalysis of aluminum chloride, introducing chloromethyl groups onto the surface of the Bougainvillea leaf extract. This improves the heat resistance and compatibility with PET resin matrix of the Bougainvillea leaf extract, thereby significantly improving the antibacterial properties of PET plastic cup material.

[0026] 3) The flexible long chain of the epoxy butyl furfuryl ester molecule in the toughening agent used in this invention can be embedded into the molecular chain of PET resin, weakening the rigidity of the crystalline region and further improving the impact resistance and high temperature resistance of PET plastic cup material.

[0027] 4) The additive used in this invention—3-hydroxyoxetane-3-carboxylic acid—can accelerate the crystallization of PET resin, reduce the warpage of the product, and enhance the intermolecular interaction of PET resin, thereby further improving the impact resistance of PET plastic cup material. Detailed Implementation

[0028] The present invention will be described in detail below with reference to specific embodiments. The illustrative embodiments and descriptions of the present invention are used to explain the present invention, but are not intended to limit the present invention.

[0029] Example 1

[0030] The high-temperature resistant and antibacterial PET plastic cup material is prepared from the following components in parts by weight: 68 parts PET resin, 27 parts glass fiber, 1 part nucleating agent, 0.8 parts lubricant, 1.4 parts toughening agent, 0.7 parts antioxidant, 4.5 parts antibacterial agent, and 2.6 parts additives. The intrinsic viscosity of the PET resin is 0.8 dL / g; the glass fiber is alkali-free glass fiber with a single fiber diameter of 14 μm; the nucleating agent is talc powder with an average particle size of 3 μm; the lubricant is silicone powder with an average particle size of 15 μm; the toughening agent consists of ethylene-methyl acrylate-glycidyl methacrylate and epoxy butyl furfuryl oleate in a mass ratio of 3:1; the antioxidant consists of antioxidant 1010 and antioxidant 168 in a mass ratio of 1:1; and the additive is 3-hydroxyoxetane-3-carboxylic acid.

[0031] The antibacterial agent is prepared by the following steps:

[0032] (1) Dry the leaves of Bougainvillea at 60°C for 1.5 hours, crush them and sieve them to obtain Bougainvillea leaf powder with a particle size of 60 mesh. Add the Bougainvillea leaf powder to an 80% ethanol aqueous solution at a ratio of 1g:10mL and soak it at 45°C for 12 hours to obtain the soaking solution.

[0033] (2) Place the soaking solution obtained in step (1) in an ultrasonic cleaner and extract it for 50 minutes at 250W power, 40kHz frequency and 45℃ to obtain an extract. Filter the extract to obtain a filtrate. Distill the filtrate under reduced pressure at 40kPa and 55℃ to obtain a crude extract. Extract the crude extract with n-hexane and separate the liquids. After removing the n-hexane from the upper liquid by rotary evaporation, obtain the leaf extract of Bougainvillea.

[0034] (3) The leaf extract of Bougainvillea obtained in step (2) and 1-chloro-4-(chloromethoxy)butane were added to hexafluoroisopropanol, stirred until evenly mixed, and allowed to stand for 24 hours. After adding aluminum chloride, the mixture was stirred at room temperature for 1 hour. After heating to 45°C, the mixture was stirred for 7 hours to obtain the reactant. The reactant was washed three times with anhydrous ethanol and deionized water, respectively, and then transferred to a vacuum drying oven and dried at 60°C to constant weight to obtain the antibacterial agent. The ratio of Bougainvillea leaf extract, 1-chloro-4-(chloromethoxy)butane, hexafluoroisopropanol and aluminum chloride was 6g:1g:50mL:1g.

[0035] The preparation method of Example 1 includes the following steps:

[0036] S1. Weigh each component according to the weight proportions, dry the PET resin at 120℃ for 4 hours, cool it to room temperature, and add it together with the other components except glass fiber into a mixer. Stir at 400 rpm for 45 minutes to obtain the mixture.

[0037] S2. Add the mixture obtained in step S1 to the main feed port of the twin-screw extruder, add the glass fiber to the side feed port of the twin-screw extruder, and granulate after melt extrusion to obtain high-temperature resistant and antibacterial PET plastic cup material; the main speed of the twin-screw extruder is 500 rpm, the length-to-diameter ratio is 36:1, the temperature of zone 1 is 255℃, the temperature of zone 2 is 270℃, the temperature of zone 3 is 280℃, the temperature of zone 4 is 285℃, the temperature of zone 5 is 280℃, the temperature of zone 6 is 270℃, and the temperature of zone 7 is 265℃.

[0038] Example 2

[0039] The high-temperature resistant and antibacterial PET plastic cup material is prepared from the following components in parts by weight: 70 parts PET resin, 28 parts glass fiber, 1.2 parts nucleating agent, 1 part lubricant, 1.5 parts toughening agent, 0.8 parts antioxidant, 5 parts antibacterial agent, and 3 parts additives. The intrinsic viscosity of the PET resin is 0.9 dL / g; the glass fiber is alkali-free glass fiber with a single fiber diameter of 16 μm; the nucleating agent is talc powder with an average particle size of 5 μm; the lubricant is silicone powder with an average particle size of 20 μm; the toughening agent consists of ethylene-methyl acrylate-glycidyl methacrylate and epoxy butyl furfuryl oleate in a mass ratio of 3:1; the antioxidant consists of antioxidant 1010 and antioxidant 168 in a mass ratio of 1:1; and the additive is 3-hydroxyoxetane-3-carboxylic acid.

[0040] The antibacterial agent is prepared by the following steps:

[0041] (1) Dry the leaves of Bougainvillea at 60°C for 1 hour, crush them and sieve them to obtain Bougainvillea leaf powder with a particle size of 60 mesh. Add the Bougainvillea leaf powder to an 80% ethanol aqueous solution at a ratio of 1g:10mL and soak it at 45°C for 12 hours to obtain the soaking solution.

[0042] (2) Place the soaking solution obtained in step (1) in an ultrasonic cleaner and extract it for 50 minutes at 250W power, 40kHz frequency and 45℃ to obtain an extract. Filter the extract to obtain a filtrate. Distill the filtrate under reduced pressure at 40kPa and 60℃ to obtain a crude extract. Extract the crude extract with n-hexane and separate the liquids. Remove the n-hexane from the upper liquid by rotary evaporation to obtain the leaf extract of Bougainvillea.

[0043] (3) The leaf extract of Bougainvillea obtained in step (2) and 1-chloro-4-(chloromethoxy)butane were added to hexafluoroisopropanol, stirred until evenly mixed, and allowed to stand for 24 hours. After adding aluminum chloride, the mixture was stirred at room temperature for 1 hour. After heating to 45°C, the mixture was stirred for 6 hours to obtain the reactant. The reactant was washed three times with anhydrous ethanol and deionized water, and then transferred to a vacuum drying oven and dried at 60°C to constant weight to obtain the antibacterial agent. The ratio of Bougainvillea leaf extract, 1-chloro-4-(chloromethoxy)butane, hexafluoroisopropanol and aluminum chloride was 6g:1g:50mL:1g.

[0044] The preparation method of Example 2 includes the following steps:

[0045] S1. Weigh each component according to the weight proportions, dry the PET resin at 120℃ for 4 hours, cool it to room temperature, and add it together with the other components except glass fiber into a mixer. Stir at 500 rpm for 40 minutes to obtain the mixture.

[0046] S2. Add the mixture obtained in step S1 to the main feed port of the twin-screw extruder, add the glass fiber to the side feed port of the twin-screw extruder, and granulate after melt extrusion to obtain high-temperature resistant and antibacterial PET plastic cup material; the main speed of the twin-screw extruder is 500 rpm, the length-to-diameter ratio is 36:1, the temperature of zone 1 is 260℃, the temperature of zone 2 is 275℃, the temperature of zone 3 is 285℃, the temperature of zone 4 is 290℃, the temperature of zone 5 is 285℃, the temperature of zone 6 is 275℃, and the temperature of zone 7 is 270℃.

[0047] Example 3

[0048] The high-temperature resistant and antibacterial PET plastic cup material is prepared from the following components in parts by weight: 65 parts PET resin, 25 parts glass fiber, 0.8 parts nucleating agent, 0.6 parts lubricant, 1 part toughening agent, 0.5 parts antioxidant, 4 parts antibacterial agent, and 2 parts additives. The intrinsic viscosity of the PET resin is 0.6 dL / g; the glass fiber is alkali-free glass fiber with a single fiber diameter of 12 μm; the nucleating agent is talc powder with an average particle size of 1 μm; the lubricant is silicone powder with an average particle size of 10 μm; the toughening agent consists of ethylene-methyl acrylate-glycidyl methacrylate and epoxy butyl furfuryl oleate in a mass ratio of 3:1; the antioxidant consists of antioxidant 1010 and antioxidant 168 in a mass ratio of 1:1; and the additive is 3-hydroxyoxetane-3-carboxylic acid.

[0049] The antibacterial agent is prepared by the following steps:

[0050] (1) Dry the leaves of Bougainvillea at 60°C for 2 hours, crush them and sieve them to obtain Bougainvillea leaf powder with a particle size of 60 mesh. Add the Bougainvillea leaf powder to an 80% ethanol aqueous solution at a ratio of 1g:10mL and soak it at 45°C for 12 hours to obtain the soaking solution.

[0051] (2) Place the soaking solution obtained in step (1) in an ultrasonic cleaner and extract it for 50 minutes at 250W power, 40kHz frequency and 45℃ to obtain an extract. Filter the extract to obtain a filtrate. Distill the filtrate under reduced pressure at 40kPa and 50℃ to obtain a crude extract. Extract the crude extract with n-hexane and separate the liquids. After removing the n-hexane from the upper liquid by rotary evaporation, obtain the leaf extract of Bougainvillea.

[0052] (3) The leaf extract of Bougainvillea obtained in step (2) and 1-chloro-4-(chloromethoxy)butane were added to hexafluoroisopropanol, stirred until evenly mixed, and allowed to stand for 24 hours. After adding aluminum chloride, the mixture was stirred at room temperature for 1 hour. After heating to 45°C, the mixture was stirred for 8 hours to obtain the reactant. The reactant was washed three times with anhydrous ethanol and deionized water, respectively, and then transferred to a vacuum drying oven and dried at 60°C to constant weight to obtain the antibacterial agent. The ratio of Bougainvillea leaf extract, 1-chloro-4-(chloromethoxy)butane, hexafluoroisopropanol and aluminum chloride was 6g:1g:50mL:1g.

[0053] The preparation method of Example 3 includes the following steps:

[0054] S1. Weigh each component according to the weight proportions, dry the PET resin at 120℃ for 4 hours, cool it to room temperature, and add it together with the other components except glass fiber into a mixer. Stir at 500 rpm for 40 minutes to obtain the mixture.

[0055] S2. Add the mixture obtained in step S1 to the main feed port of the twin-screw extruder, add the glass fiber to the side feed port of the twin-screw extruder, and granulate after melt extrusion to obtain high-temperature resistant and antibacterial PET plastic cup material; the main speed of the twin-screw extruder is 500 rpm, the length-to-diameter ratio is 36:1, the temperature of zone 1 is 250℃, the temperature of zone 2 is 265℃, the temperature of zone 3 is 270℃, the temperature of zone 4 is 290℃, the temperature of zone 5 is 275℃, the temperature of zone 6 is 260℃, and the temperature of zone 7 is 260℃.

[0056] Example 4

[0057] The high-temperature resistant and antibacterial PET plastic cup material is prepared from the following components in parts by weight: 66 parts PET resin, 26 parts glass fiber, 0.9 parts nucleating agent, 0.7 parts lubricant, 1.2 parts toughening agent, 0.6 parts antioxidant, 4.2 parts antibacterial agent, and 2.4 parts additives. The intrinsic viscosity of the PET resin is 0.7 dL / g; the glass fiber is alkali-free glass fiber with a single fiber diameter of 15 μm; the nucleating agent is talc powder with an average particle size of 2 μm; the lubricant is silicone powder with an average particle size of 12 μm; the toughening agent consists of ethylene-methyl acrylate-glycidyl methacrylate and epoxy butyl furfuryl oleate in a mass ratio of 3:1; the antioxidant consists of antioxidant 1010 and antioxidant 168 in a mass ratio of 1:1; and the additive is 3-hydroxyoxetane-3-carboxylic acid.

[0058] The antibacterial agent is prepared by the following steps:

[0059] (1) Dry the leaves of Bougainvillea at 60°C for 1.5 hours, crush them and sieve them to obtain Bougainvillea leaf powder with a particle size of 60 mesh. Add the Bougainvillea leaf powder to an 80% ethanol aqueous solution at a ratio of 1g:10mL and soak it at 45°C for 12 hours to obtain the soaking solution.

[0060] (2) Place the soaking solution obtained in step (1) in an ultrasonic cleaner and extract it for 50 minutes at 250W power, 40kHz frequency and 45℃ to obtain an extract. Filter the extract to obtain a filtrate. Distill the filtrate under reduced pressure at 40kPa and 60℃ to obtain a crude extract. Extract the crude extract with n-hexane and separate the liquids. Remove the n-hexane from the upper liquid by rotary evaporation to obtain the leaf extract of Bougainvillea.

[0061] (3) The leaf extract of Bougainvillea obtained in step (2) and 1-chloro-4-(chloromethoxy)butane were added to hexafluoroisopropanol, stirred until evenly mixed, and allowed to stand for 24 hours. After adding aluminum chloride, the mixture was stirred at room temperature for 1 hour. After heating to 45°C, the mixture was stirred for 7.5 hours to obtain the reactant. The reactant was washed three times with anhydrous ethanol and deionized water, respectively, and then transferred to a vacuum drying oven and dried at 60°C to constant weight to obtain the antibacterial agent. The ratio of Bougainvillea leaf extract, 1-chloro-4-(chloromethoxy)butane, hexafluoroisopropanol and aluminum chloride was 6g:1g:50mL:1g.

[0062] The preparation method of Example 4 includes the following steps:

[0063] S1. Weigh each component according to the weight proportions, dry the PET resin at 120℃ for 4 hours, cool it to room temperature, and add it together with the other components except glass fiber into a mixer. Stir at 400 rpm for 50 minutes to obtain the mixture.

[0064] S2. Add the mixture obtained in step S1 to the main feed port of the twin-screw extruder, add the glass fiber to the side feed port of the twin-screw extruder, and granulate after melt extrusion to obtain high-temperature resistant and antibacterial PET plastic cup material; the main speed of the twin-screw extruder is 500 rpm, the length-to-diameter ratio is 36:1, the temperature of zone 1 is 260℃, the temperature of zone 2 is 270℃, the temperature of zone 3 is 275℃, the temperature of zone 4 is 285℃, the temperature of zone 5 is 280℃, the temperature of zone 6 is 265℃, and the temperature of zone 7 is 265℃.

[0065] Comparative Example 1:

[0066] The difference from Example 1 is that the components do not include glass fibers.

[0067] Comparative Example 2:

[0068] The difference from Example 1 is that the toughening agent in the component is ethylene-methyl acrylate-glycidyl methacrylate, that is, the toughening agent does not contain butyl glycidyl furfurylate.

[0069] Comparative Example 3:

[0070] The difference from Example 1 is that the antibacterial agent in the components is replaced with untreated Bougainvillea leaf extract, and the preparation steps of the antibacterial agent do not include step (3).

[0071] Comparative Example 4:

[0072] The difference from Example 1 is that the component does not include the auxiliary agent 3-hydroxyoxetane-3-carboxylic acid.

[0073] Experiment Example 1: High Temperature Resistance Test

[0074] The heat distortion temperature of the PET plastic cup materials prepared in Examples 1-4 and Comparative Examples 1-2 were determined according to GB / T 1634-2019 standard, with a test pressure of 1.82 MPa. A higher heat distortion temperature indicates better high-temperature resistance. The test results are shown in Table 1.

[0075] Heat distortion temperature (°C) Example 1 208 Example 2 206 Example 3 203 Example 4 204 Comparative Example 1 139 Comparative Example 2 187

[0076] Table 1

[0077] As shown in Table 1, the heat distortion temperatures of Examples 1-4 of the present invention are all relatively high, indicating that the high-temperature resistant and antibacterial PET plastic cup material prepared by the present invention has good high-temperature resistance. Some components of Comparative Examples 1-2 differ from those of Example 1. Compared with Example 1, the heat distortion temperature of Comparative Example 1 is significantly lower, indicating that the glass fiber used in the present invention can greatly improve the high-temperature resistance of the PET plastic cup material. Compared with Example 1, the heat distortion temperature of Comparative Example 2 is also lower, indicating that the epoxy butyl furfuryl ester in the toughening agent used in the present invention can also improve the high-temperature resistance of the PET plastic cup material.

[0078] Experiment Example 2: Antibacterial Performance Test

[0079] The antibacterial rate of the PET plastic cup materials prepared in Examples 1-4 and Comparative Example 3 were determined according to GB / T 31402-2015 standard. The test bacteria was *Escherichia coli*. A higher antibacterial rate indicates better antibacterial performance. The test results are shown in Table 2.

[0080] Antibacterial rate (%) Example 1 99.40 Example 2 99.52 Example 3 99.28 Example 4 99.34 Comparative Example 3 65.76

[0081] Table 2

[0082] As shown in Table 2, the antibacterial rates of Examples 1-4 of the present invention are all high, indicating that the high-temperature resistant antibacterial PET plastic cup material prepared by the present invention has good antibacterial properties. Comparative Example 3 differs from Example 1 in some components and preparation steps. Compared with Example 1, the antibacterial rate of Comparative Example 3 is significantly lower, indicating that the antibacterial agent prepared by the present invention has a better effect on improving the antibacterial properties of the PET plastic cup material compared with the untreated Bougainvillea leaf extract.

[0083] Experiment Example 3: Impact Resistance Test

[0084] The notched impact strength of the PET plastic cup materials prepared in Examples 1-4, Comparative Examples 1, 2, and 4 were determined according to GB / T 1843-2008 standard at a test temperature of 23℃. Higher notched impact strength indicates better impact resistance. The test results are shown in Table 3.

[0085] Notched impact strength (kJ / m²) Example 1 7.7 Example 2 7.9 Example 3 7.2 Example 4 7.5 Comparative Example 1 5.2 Comparative Example 2 6.5 Comparative Example 4 6.7

[0086] Table 3

[0087] As shown in Table 3, the notched impact strengths of Examples 1-4 of the present invention are all relatively high, indicating that the high-temperature resistant and antibacterial PET plastic cup material prepared by the present invention has good impact resistance. Comparative Examples 1, 2, and 4 have some components different from Example 1. Compared with Example 1, the notched impact strength of Comparative Example 1 is significantly lower, indicating that the glass fiber used in the present invention can significantly improve the impact resistance of the PET plastic cup material. Compared with Example 1, the notched impact strengths of Comparative Examples 2 and 4 are also lower, indicating that the toughening agent butyl epoxide and the auxiliary agent 3-hydroxyoxetane-3-carboxylic acid used in the present invention can also improve the impact resistance of the PET plastic cup material.

[0088] Experiment Example 4: Warpage Test

[0089] The PET plastic cup materials obtained in Examples 1-4 and Comparative Example 4 were injection molded into flat plates with dimensions of 100mm × 100mm × 1mm. Each plate was placed in a constant temperature environment of 23℃ for 24 hours, and then placed on a horizontal glass surface. The height difference between the highest deformation point of each plate and the horizontal glass surface was measured and recorded as the warpage deformation. A smaller warpage deformation indicates a smaller degree of warpage. The test results are shown in Table 4.

[0090] Warpage deformation (mm) Example 1 0.26 Example 2 0.25 Example 3 0.30 Example 4 0.27 Comparative Example 4 0.92

[0091] Table 4

[0092] As shown in Table 4, the warpage deformation of Examples 1 to 4 of the present invention is relatively small, indicating that the high-temperature resistant and antibacterial PET plastic cup material prepared by the present invention has a low degree of warpage. Some components of Comparative Example 4 are different from those of Example 1. Compared with Example 1, the warpage deformation of Comparative Example 4 is significantly increased, indicating that the additive used in the present invention—3-hydroxyoxetane-3-carboxylic acid—can significantly reduce the warpage of the PET plastic cup material.

[0093] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A high-temperature resistant and antibacterial PET plastic cup material, characterized in that: It is prepared from the following components in parts by weight: 65-70 parts PET resin, 25-28 parts glass fiber, 0.8-1.2 parts nucleating agent, 0.6-1 part lubricant, 1-1.5 parts toughening agent, 0.5-0.8 parts antioxidant, 4-5 parts antibacterial agent, and 2-3 parts additives; the toughening agent is composed of ethylene-methyl acrylate-glycidyl methacrylate and epoxy butyl furfurylate in a mass ratio of 3:1; the additive is 3-hydroxyoxetane-3-carboxylic acid; the antibacterial agent is prepared by the following steps: (1) Dry the leaves of Bougainvillea for 1-2 hours, crush them and sieve them to obtain Bougainvillea leaf powder. Add the Bougainvillea leaf powder to an ethanol aqueous solution and soak it at 45°C for 12 hours to obtain an soaking solution. (2) Place the soaking solution obtained in step (1) in an ultrasonic cleaner and extract it at 45°C for 50 minutes to obtain an extract. Filter the extract to obtain a filtrate. Distill the filtrate under reduced pressure to obtain a crude extract. Extract the crude extract with n-hexane and separate the liquids. After removing the n-hexane from the upper liquid by rotary evaporation, obtain the leaf extract of Bougainvillea. (3) Add the leaf extract of Bougainvillea obtained in step (2) and 1-chloro-4-(chloromethoxy)butane to hexafluoroisopropanol, stir until the mixture is uniform, let stand for 24 hours, add aluminum chloride and stir at room temperature for 1 hour, heat to 45°C and stir for 6-8 hours to obtain the reactant, wash the reactant three times with anhydrous ethanol and deionized water respectively, transfer it to a vacuum drying oven and vacuum dry to constant weight to obtain the antibacterial agent.

2. The high-temperature resistant and antibacterial PET plastic cup material according to claim 1, characterized in that: The intrinsic viscosity of the PET resin is 0.6 to 0.9 dL / g.

3. The high-temperature resistant and antibacterial PET plastic cup material according to claim 1, characterized in that: The glass fiber is an alkali-free glass fiber with a single fiber diameter of 12-16 μm.

4. The high-temperature resistant and antibacterial PET plastic cup material according to claim 1, characterized in that: The nucleating agent is talc powder with an average particle size of 1–5 μm.

5. The high-temperature resistant and antibacterial PET plastic cup material according to claim 1, characterized in that: The lubricant is silicone powder with an average particle size of 10-20 μm.

6. The high-temperature resistant and antibacterial PET plastic cup material according to claim 1, characterized in that: The antioxidant is composed of antioxidant 1010 and antioxidant 168 in a mass ratio of 1:

1.

7. The high-temperature resistant and antibacterial PET plastic cup material according to claim 1, characterized in that: In step (1) of the preparation of the antibacterial agent, the drying temperature is 60℃, the particle size of the bougainvillea leaf powder is 60 mesh, the volume concentration of the ethanol aqueous solution is 80%, and the ratio of bougainvillea leaf powder to ethanol aqueous solution is 1g:10mL; in step (2), the ultrasonic extraction power is 250W, the ultrasonic extraction frequency is 40kHz, the vacuum distillation temperature is 50-60℃, and the vacuum distillation pressure is 40kPa; in step (3), the ratio of bougainvillea leaf extract, 1-chloro-4-(chloromethoxy)butane, hexafluoroisopropanol, and aluminum chloride is 6g:1g:50mL:1g, and the vacuum drying temperature is 60℃.

8. A method for preparing a high-temperature resistant and antibacterial PET plastic cup material according to any one of claims 1 to 7, characterized in that: Includes the following steps: S1. Weigh each component according to the weight proportions, dry the PET resin at 120℃ for 4 hours, cool it to room temperature, and add it together with the other components except glass fiber into a mixer. Stir at 400-500 rpm for 40-50 minutes to obtain the mixture. S2. Add the mixture obtained in step S1 to the main feed port of the twin-screw extruder, add the glass fiber to the side feed port of the twin-screw extruder, and granulate after melt extrusion to obtain high-temperature resistant and antibacterial PET plastic cup material; the main speed of the twin-screw extruder is 500 rpm, the length-to-diameter ratio is 36:1, the temperature of zone 1 is 250-260℃, the temperature of zone 2 is 265-275℃, the temperature of zone 3 is 270-285℃, the temperature of zone 4 is 285-290℃, the temperature of zone 5 is 275-285℃, the temperature of zone 6 is 260-275℃, and the temperature of zone 7 is 260-270℃.