Low-carbon recyclable RPP material and method for preparing tableware from same

Abstract

The invention discloses a low-carbon recyclable RPP material and a method for preparing tableware from the same. The method for preparing the tableware from the low-carbon recyclable RPP material comprises the following steps: (1) adding polypropylene, a composite heat stabilizer and a chain extender into a high-speed mixer, uniformly stirring, and extruding and granulating through a double-screw extruder to obtain the low-carbon recyclable RPP material; and (2) adding the obtained low-carbon recyclable RPP material into a feeding port of an injection molding machine, setting processing parameters to obtain a finished product, putting the formed finished product into a sample table for heat dissipation, and obtaining the tableware prepared from the low-carbon recyclable RPP material after heat dissipation is finished. The heat stability of the tableware can be effectively improved by adding the composite heat stabilizer, the high-temperature-resistant temperature of the tableware is 126 DEG C, and the cycle performance of the RPP material can be effectively improved by adding the chain extender.

Description

Technical Field

[0001] The invention belongs to the technical field of tableware preparation, and particularly relates to a low-carbon recyclable RPP material and a method for preparing tableware from the same. Background Art

[0002] As people's awareness of environmental protection continues to increase, the application of low-carbon, recyclable and environmentally friendly materials in various fields has received more and more attention. Polypropylene (PP), as a common plastic material, is widely used in various fields, including tableware manufacturing, due to its good mechanical properties, processing properties and low cost. However, traditional PP materials will produce a large amount of carbon emissions during production and use, and are difficult to degrade in the natural environment, causing a certain burden on the environment. By adding glass fiber and organic filler to PP materials, its mechanical properties and heat resistance can be significantly improved, while reducing carbon emissions during its production process. The obtained RPP material also has good recyclability, reducing resource waste and environmental pollution. However, there are still some problems in preparing RPP materials into tableware, such as affecting the food safety of the material, and it is easy to deform under high temperature use. Therefore, it is necessary to find a low-carbon, recyclable, food-safe RPP material to prepare tableware.

[0003] Patent CN 114854079 B discloses a method for preparing heat-resistant PLA blister tableware, which comprises the following steps: (1) the PLA blister tableware raw material is prepared into a sheet by an extruder drawing process, and then the sheet is prepared into a tableware sample by a blister molding process, wherein the tableware sample contains PLA that has not been completely crystallized; (2) the tableware sample is soaked in carbon dioxide at a constant temperature and pressure to complete the crystallization of the uncrystallized PLA in the tableware sample, and a PLA tableware product with a temperature resistance of >100°C is prepared. The prepared PLA blister tableware has the advantages of being heat-resistant and not deformed when exposed to heat, and is also biodegradable. However, the mechanical properties and thermal stability of the tableware obtained by this method still have room for improvement. Summary of the invention

[0004] The purpose of the present invention is to provide a low-carbon recyclable RPP material and a method for preparing tableware thereof, so as to solve the technical problem of poor mechanical properties and thermal stability of tableware in the prior art.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] The present invention provides a low-carbon recyclable RPP material, which is composed of the following components in parts by weight: 95-98 parts of polypropylene, 1-3 parts of a composite heat stabilizer, and 1-2 parts of a chain extender, wherein the polypropylene is obtained by selecting, washing, and granulating post-consumer polypropylene, and the post-consumer polypropylene includes packaging barrels, fast food boxes, and milk tea cups; the composite heat stabilizer is composed of oleic acid, 25# Transformer oil, zinc oxide and methyl parahydroxybenzoate are obtained through esterification and addition reaction.

[0007] Preferably, the preparation method of the composite thermal stabilizer comprises the following steps:

[0008] S1: Oleic acid and 25 # Transformer oil as a solvent was added into a three-necked round-bottom flask, stirred continuously, and heated, and then diethylene glycol butyl ether and zinc oxide were added, and the reaction continued;

[0009] S2: The product obtained after the reaction is subjected to reduced pressure distillation to remove water to obtain an oil-zinc mixture, and then the oil-zinc mixture is mixed and stirred with methyl parahydroxybenzoate, and dried to obtain a composite heat stabilizer.

[0010] In the above process, oleic acid and 25 # Transformer oil undergoes esterification reaction under heating and stirring conditions to synthesize oleic acid. Subsequently, the ether bond in diethylene glycol butyl ether and the zinc ion in zinc oxide undergo addition reaction to form diethylene glycol butyl ether zinc salt containing a coordination bond. Oleic acid and diethylene glycol butyl ether zinc salt react in a mixed manner to generate an oil-zinc mixture. Finally, the oil-zinc mixture reacts with methyl parahydroxybenzoate to obtain a composite heat stabilizer.

[0011] Preferably, in S1, the purity of oleic acid is 99%, oleic acid, 25 # The mass ratio of transformer oil, diethylene glycol butyl ether and zinc oxide is (2-2.5): (22-25): (2-3): (8-8.3), the stirring time is 1-3h, the heating temperature is 80-90°C, the continuous reaction temperature is 80-90°C, and the continuous reaction time is 2-3h; in S2, the mass ratio of the oil-zinc mixture and methyl paraben is (4.5-5.1): (1-3), the mixing and stirring time is 2-4h, the drying temperature is 40-50°C, and the drying time is 36-48h.

[0012] Preferably, the chain extender is a combination of one or more of ADR4380, ADR4300 and ADR4368-C.

[0013] Preferably, the method for preparing tableware from the low-carbon recyclable RPP material comprises the following steps:

[0014] Step (1): adding polypropylene, composite heat stabilizer and chain extender into a high-speed mixer and stirring evenly, and then extruding and granulating through a twin-screw extruder to obtain a low-carbon recyclable RPP material;

[0015] Step (2): Add the obtained low-carbon recyclable RPP material to the feed port of the injection molding machine, set the processing parameters to obtain the finished product, place the molded product on a sample table for heat dissipation, and after the heat dissipation is completed, obtain tableware prepared using the low-carbon recyclable RPP material.

[0016] Preferably, in step (1), the stirring speed is 1200-1500 rpm, the stirring time is 0.2-0.4 h, and the temperature of each zone of the twin-screw extruder is set to 150°C, 170°C, 190°C, and 200°C, respectively.

[0017] Preferably, in step (2), the processing parameters are: injection pressure: 1500-1800 bar, holding pressure: 1200-1600 bar, barrel temperature: 180-220°C, mold temperature: 60-80°C, injection temperature: 175-230°C; cooling time: 1-3s; production cycle: 8-12s; heat dissipation time is 0.1-0.2h.

[0018] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0019] 1. The present invention utilizes oleic acid, zinc oxide and methyl paraben to prepare a composite heat stabilizer. The composite of the composite heat stabilizer and polypropylene can improve the thermal stability of the material. The addition of a chain extender can effectively improve the recycling performance of polypropylene. Therefore, tableware such as dinner plates, bowls and chopsticks and cups prepared by using polypropylene, a composite heat stabilizer and a chain extender to prepare RPP materials not only has the advantages of low carbon and recyclability, but also has excellent thermal stability and increased service life.

[0020] 2. The present invention uses oleic acid, zinc oxide and methyl parahydroxybenzoate as raw materials and prepares a composite heat stabilizer through reaction. The addition of the composite heat stabilizer can reduce the thermal motion and intermolecular slip of polymer molecules, so that the obtained low-carbon recyclable RPP material maintains its shape and stability under high temperature conditions. The substance also has antioxidant properties, which can inhibit the oxidative degradation of tableware caused by environmental factors such as oxygen and light during processing and use, thereby increasing the number of recyclable times and service life of the tableware. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] The following embodiments of the present invention are used:

[0023] Oleic acid was purchased from Shandong West Asia Chemical Co., Ltd., CAS number: 112-80-1;

[0024] 25 # Transformer oil was purchased from Qiruihang Lubricant (Shanghai) Co., Ltd.;

[0025] Diethylene glycol butyl ether was purchased from Nanjing Huaxi Chemical Co., Ltd., CAS number: 112-34-5;

[0026] Zinc oxide was purchased from Shijiazhuang Dayuan Chemical Co., Ltd., CAS number: 1314-13-2;

[0027] Methyl paraben was purchased from Shenzhen Love Biotechnology Co., Ltd., CAS number: 99-76-3;

[0028] ADR4380 was purchased from Dongguan Yingsheng Plastic Chemical Co., Ltd., CAS number: 9005-25-8.

[0029] Example 1

[0030] This embodiment discloses a method for preparing a composite thermal stabilizer, comprising the following steps:

[0031] S1: 2.25 g of 99% pure oleic acid and 23.5 g of 25 # Transformer oil was added as a solvent into a three-necked round-bottom flask, stirred for 2 h, and heated to 90 °C. Subsequently, 2.5 g of diethylene glycol butyl ether and 8.15 g of zinc oxide were added, and the reaction was continued at 85 °C for 2 h.

[0032] S2: The product obtained after the reaction was distilled under reduced pressure to remove water to obtain an oil-zinc mixture, and then 4.8 g of the oil-zinc mixture was mixed with 2 g of methyl parahydroxybenzoate and stirred for 4 h, and dried at 45° C. for 48 h to obtain a composite thermal stabilizer.

[0033] This embodiment discloses a low-carbon recyclable RPP material, which is composed of the following components by weight: 96.5 parts of polypropylene, 2 parts of composite heat stabilizer, and 1.5 parts of chain extender, wherein the polypropylene is obtained by selecting, washing, and granulating post-consumer polypropylene, and the post-consumer polypropylene includes packaging barrels, fast food boxes, and milk tea cups; the composite heat stabilizer is composed of oleic acid, 25 # Transformer oil, zinc oxide and methyl parahydroxybenzoate are obtained through esterification and addition reaction.

[0034] This embodiment discloses a method for preparing tableware using low-carbon recyclable RPP materials, comprising the following steps:

[0035] Step (1): Add polypropylene, composite heat stabilizer and ADR4380 to a high-speed mixer and stir evenly, stir at 1500 rpm for 0.3 h, and then extrude and granulate through a twin-screw extruder, and set the temperature of each zone of the twin-screw extruder to 150° C., 170° C., 190° C., and 200° C. in sequence to obtain a low-carbon recyclable RPP material;

[0036] Step (2): Add the obtained low-carbon recyclable RPP material to the feeding port of the injection molding machine, set the processing parameters to obtain the finished product, the processing parameters are: injection pressure: 1600 bar, holding pressure: 1400 bar, barrel temperature: 200°C, mold temperature: 70°C, injection temperature: 210°C; cooling time: 2s; production cycle: 10s; place the molded product on a sample table for heat dissipation, and after 0.2h of heat dissipation, obtain tableware prepared using low-carbon recyclable RPP material.

[0037] Example 2

[0038] This embodiment discloses a method for preparing a composite thermal stabilizer, comprising the following steps:

[0039] S1: 2.3 g of 99% pure oleic acid and 24 g of 25 # Transformer oil was added as a solvent into a three-necked round-bottom flask, stirred for 2 h, and heated to 90 °C. Subsequently, 2.0 g of diethylene glycol butyl ether and 8.00 g of zinc oxide were added, and the reaction was continued at 85 °C for 2 h.

[0040] S2: The product obtained after the reaction was distilled under reduced pressure to remove water to obtain an oil-zinc mixture, and then 4.5 g of the oil-zinc mixture was mixed with 1 g of methyl parahydroxybenzoate and stirred for 4 h, and dried at 45° C. for 48 h to obtain a composite thermal stabilizer.

[0041] This embodiment discloses a low-carbon recyclable RPP material, which is composed of the following components by weight: 95 parts of polypropylene, 1 part of a composite heat stabilizer, and 1 part of a chain extender, wherein the polypropylene is obtained by selecting, washing, and granulating post-consumer polypropylene, and the post-consumer polypropylene includes packaging barrels, fast food boxes, and milk tea cups; the composite heat stabilizer is composed of oleic acid, 25 # Transformer oil, zinc oxide and methyl parahydroxybenzoate are obtained through esterification and addition reaction.

[0042] This embodiment discloses a method for preparing tableware using low-carbon recyclable RPP materials, comprising the following steps:

[0043] Step (1): Add polypropylene, composite heat stabilizer and ADR4380 to a high-speed mixer and stir evenly, stir at 1500 rpm for 0.3 h, and then extrude and granulate through a twin-screw extruder, and set the temperature of each zone of the twin-screw extruder to 150° C., 170° C., 190° C., and 200° C. in sequence to obtain a low-carbon recyclable RPP material;

[0044] Step (2): Add the obtained low-carbon recyclable RPP material to the feeding port of the injection molding machine, set the processing parameters to obtain the finished product, the processing parameters are: injection pressure: 1600 bar, holding pressure: 1400 bar, barrel temperature: 200°C, mold temperature: 70°C, injection temperature: 210°C; cooling time: 2s; production cycle: 10s; place the molded product on the sample table for heat dissipation, and after heat dissipation for 0.1h, obtain tableware prepared using low-carbon recyclable RPP material.

[0045] Example 3

[0046] This embodiment discloses a method for preparing a composite thermal stabilizer, comprising the following steps:

[0047] S1: 2.20 g of 99% pure oleic acid and 25.0 g of 25 # Transformer oil was added as a solvent into a three-necked round-bottom flask, stirred for 2 h, and heated to 90 °C. Subsequently, 3.0 g of diethylene glycol butyl ether and 8.10 g of zinc oxide were added, and the reaction was continued at 85 °C for 2 h.

[0048] S2: The product obtained after the reaction was distilled under reduced pressure to remove water to obtain an oil-zinc mixture, and then 5.1 g of the oil-zinc mixture was mixed with 3 g of methyl parahydroxybenzoate and stirred for 4 h, and dried at 45° C. for 48 h to obtain a composite thermal stabilizer.

[0049] This embodiment discloses a low-carbon recyclable RPP material, which is composed of the following components by weight: 98 parts of polypropylene, 3 parts of composite heat stabilizer, and 2 parts of chain extender, wherein the polypropylene is obtained by selecting, washing, and granulating post-consumer polypropylene, and the post-consumer polypropylene includes packaging barrels, fast food boxes, and milk tea cups; the composite heat stabilizer is composed of oleic acid, 25 # Transformer oil, zinc oxide and methyl parahydroxybenzoate are obtained through esterification and addition reaction.

[0050] This embodiment discloses a method for preparing tableware using low-carbon recyclable RPP materials, comprising the following steps:

[0051] Step (1): Add polypropylene, composite heat stabilizer and ADR4380 to a high-speed mixer and stir evenly, stir at 1500 rpm for 0.3 h, and then extrude and granulate through a twin-screw extruder, and set the temperature of each zone of the twin-screw extruder to 150° C., 170° C., 190° C., and 200° C. in sequence to obtain a low-carbon recyclable RPP material;

[0052] Step (2): Add the obtained low-carbon recyclable RPP material to the feeding port of the injection molding machine, set the processing parameters to obtain the finished product, the processing parameters are: injection pressure: 1600 bar, holding pressure: 1400 bar, barrel temperature: 200°C, mold temperature: 70°C, injection temperature: 210°C; cooling time: 2s; production cycle: 10s; place the molded product on a sample table for heat dissipation, and after 0.2h of heat dissipation, obtain tableware prepared using low-carbon recyclable RPP material.

[0053] Example 4

[0054] This embodiment discloses a method for preparing a composite thermal stabilizer, comprising the following steps:

[0055] S1: 2.10 g of 99% pure oleic acid and 22.0 g of 25 # Transformer oil was added as a solvent into a three-necked round-bottom flask, stirred for 2 h, and heated to 90 °C. Subsequently, 2.7 g of diethylene glycol butyl ether and 8.30 g of zinc oxide were added, and the reaction was continued at 85 °C for 2 h.

[0056] S2: The product obtained after the reaction was distilled under reduced pressure to remove water to obtain an oil-zinc mixture, and then 5.0 g of the oil-zinc mixture was mixed with 2.5 g of methyl parahydroxybenzoate and stirred for 4 h, and dried at 45° C. for 48 h to obtain a composite thermal stabilizer.

[0057] This embodiment discloses a low-carbon recyclable RPP material, which is composed of the following components by weight: 96 parts of polypropylene, 1.5 parts of composite heat stabilizer, and 1.1 parts of chain extender, wherein the polypropylene is obtained by selecting, washing, and granulating post-consumer polypropylene, and the post-consumer polypropylene includes packaging barrels, fast food boxes, and milk tea cups; the composite heat stabilizer is composed of oleic acid, 25 # Transformer oil, zinc oxide and methyl parahydroxybenzoate are obtained through esterification and addition reaction.

[0058] This embodiment discloses a method for preparing tableware using low-carbon recyclable RPP materials, comprising the following steps:

[0059] Step (1): Add polypropylene, composite heat stabilizer and ADR4380 to a high-speed mixer and stir evenly, stir at 1500 rpm for 0.4 h, and then extrude and granulate through a twin-screw extruder, and set the temperature of each zone of the twin-screw extruder to 150° C., 170° C., 190° C., and 200° C. in sequence to obtain a low-carbon recyclable RPP material;

[0060] Step (2): Add the obtained low-carbon recyclable RPP material to the feeding port of the injection molding machine, set the processing parameters to obtain the finished product, the processing parameters are: injection pressure: 1600 bar, holding pressure: 1400 bar, barrel temperature: 200°C, mold temperature: 70°C, injection temperature: 210°C; cooling time: 2s; production cycle: 10s; place the molded product on the sample table for heat dissipation, and after heat dissipation for 0.1h, obtain tableware prepared using low-carbon recyclable RPP material.

[0061] Example 5

[0062] This embodiment discloses a method for preparing a composite thermal stabilizer, comprising the following steps:

[0063] S1: 2.50 g of 99% pure oleic acid and 23.0 g of 25 # Transformer oil was added as a solvent into a three-necked round-bottom flask, stirred for 2 h, and heated to 90 °C. Subsequently, 2.3 g of diethylene glycol butyl ether and 8.20 g of zinc oxide were added, and the reaction was continued at 85 °C for 2 h.

[0064] S2: The product obtained after the reaction was distilled under reduced pressure to remove water to obtain an oil-zinc mixture, and then 4.7 g of the oil-zinc mixture was mixed with 1.5 g of methyl parahydroxybenzoate and stirred for 4 h, and dried at 45° C. for 48 h to obtain a composite thermal stabilizer.

[0065] This embodiment discloses a low-carbon recyclable RPP material, which is composed of the following components by weight: 97 parts of polypropylene, 2.5 parts of composite heat stabilizer, and 1.7 parts of chain extender, wherein the polypropylene is obtained by selecting, washing, and granulating post-consumer polypropylene, and the post-consumer polypropylene includes packaging barrels, fast food boxes, and milk tea cups; the composite heat stabilizer is composed of oleic acid, 25 # Transformer oil, zinc oxide and methyl parahydroxybenzoate are obtained through esterification and addition reaction.

[0066] This embodiment discloses a method for preparing tableware using low-carbon recyclable RPP materials, comprising the following steps:

[0067] Step (1): Add polypropylene, composite heat stabilizer and ADR4380 to a high-speed mixer and stir evenly, stir at 1500 rpm for 0.4 h, and then extrude and granulate through a twin-screw extruder, and set the temperature of each zone of the twin-screw extruder to 150° C., 170° C., 190° C., and 200° C. in sequence to obtain a low-carbon recyclable RPP material;

[0068] Step (2): Add the obtained low-carbon recyclable RPP material to the feeding port of the injection molding machine, set the processing parameters to obtain the finished product, the processing parameters are: injection pressure: 1600 bar, holding pressure: 1400 bar, barrel temperature: 200°C, mold temperature: 70°C, injection temperature: 210°C; cooling time: 2s; production cycle: 10s; place the molded product on a sample table for heat dissipation, and after 0.2h of heat dissipation, obtain tableware prepared using low-carbon recyclable RPP material.

[0069] Comparative Example 1

[0070] Comparative Example 1 Compared with Example 1, in the process of preparing the composite heat stabilizer in Comparative Example 1, zinc oxide was not added, and other conditions remained unchanged.

[0071] Comparative Example 2

[0072] Comparative Example 2 Compared with Example 1, in the process of preparing the composite thermal stabilizer in Comparative Example 2, methyl p-hydroxybenzoate was not added, and other conditions remained unchanged.

[0073] Experimental example

[0074] The tableware prepared in Examples 1-5 and Comparative Examples 1-2 were subjected to performance tests.

[0075] Thermal stability test

[0076] The obtained samples were placed in ovens at different temperatures for testing, and the temperatures at which the samples deformed, cracked or discolored were recorded. The results are shown in Table 1:

[0077] Table 1

[0078]

[0079] From the test results in Table 1, it can be seen that the tableware prepared in Examples 1-5 of the present invention has excellent thermal stability. From the comparison between Comparative Example 1 and Examples 1-5, it can be seen that the addition of zinc oxide can effectively improve the thermal stability of tableware; from the comparison between Comparative Example 2 and Examples 1-5, it can be seen that the addition of methyl paraben can effectively improve the thermal stability of tableware.

[0080] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

[0081] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to only specific implementation methods. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. Low-carbon recyclable RPP material, characterized by: The invention is composed of the following components in parts by weight: 95-98 parts of polypropylene, 1-3 parts of composite heat stabilizer, and 1-2 parts of chain extender, wherein the polypropylene is obtained by selecting, washing, and granulating post-consumer polypropylene, and the post-consumer polypropylene includes packaging barrels, fast food boxes, and milk tea cups; the composite heat stabilizer is composed of oleic acid, 25 # Transformer oil, zinc oxide and methyl parahydroxybenzoate are obtained through esterification and addition reaction.

2. The low-carbon recyclable RPP material according to claim 1, characterized in that: The preparation method of the composite thermal stabilizer comprises the following steps: S1: Oleic acid and 25 # Transformer oil as a solvent was added into a three-necked round-bottom flask, stirred continuously, and heated, and then diethylene glycol butyl ether and zinc oxide were added, and the reaction continued; S2: The product obtained after the reaction is subjected to reduced pressure distillation to remove water to obtain an oil-zinc mixture, and then the oil-zinc mixture is mixed and stirred with methyl parahydroxybenzoate, and dried to obtain a composite heat stabilizer.

3. The low-carbon recyclable RPP material according to claim 2, characterized in that: In the S1, the purity of oleic acid is 99%, oleic acid, 25 # The mass ratio of transformer oil, diethylene glycol butyl ether and zinc oxide is (2-2.5): (22-25): (2-3): (8-8.3), the stirring time is 1-3h, the heating temperature is 80-90°C, the continuous reaction temperature is 80-90°C, and the continuous reaction time is 2-3h; in S2, the mass ratio of the oil-zinc mixture and methyl paraben is (4.5-5.1): (1-3), the mixing and stirring time is 2-4h, the drying temperature is 40-50°C, and the drying time is 36-48h.

4. The low-carbon recyclable RPP material according to claim 1, characterized in that: The chain extender is a combination of one or more of ADR4380, ADR4300 and ADR4368-C.

5. The method for preparing tableware using low-carbon recyclable RPP materials according to any one of claims 1 to 4, characterized in that: The following steps are involved: Step (1): adding polypropylene, composite heat stabilizer and chain extender into a high-speed mixer and stirring evenly, and then extruding and granulating through a twin-screw extruder to obtain a low-carbon recyclable RPP material; Step (2): Add the obtained low-carbon recyclable RPP material to the feed port of the injection molding machine, set the processing parameters to obtain the finished product, place the molded product on a sample table for heat dissipation, and after the heat dissipation is completed, obtain tableware prepared using the low-carbon recyclable RPP material.

6. The method for preparing tableware from low-carbon recyclable RPP materials according to claim 5, characterized in that: In the step (1), the stirring speed is 1200-1500 rpm, the stirring time is 0.2-0.4 h, and the temperature of each zone of the twin-screw extruder is set to 150° C., 170° C., 190° C., and 200° C. in sequence.

7. The method for preparing tableware from low-carbon recyclable RPP materials according to claim 5, characterized in that: In the step (2), the processing parameters are: injection pressure: 1500-1800 bar, holding pressure: 1200-1600 bar, barrel temperature: 180-220°C, mold temperature: 60-80°C, injection temperature: 175-230°C; cooling time: 1-3s; production cycle: 8-12s; heat dissipation time is 0.1-0.2h.

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