Preparation method of high-toughness transparent plastic cup

Abstract

The invention discloses a preparation method of a high-toughness transparent plastic cup, and belongs to the technical field of plastic preparation, and the preparation method comprises the following steps: 1, preparing a modified elastomer toughening agent from 16.4-21.9% of an isosorbide-based plasticizer, 2.2-2.6% of polydimethylsiloxane, 1.5-2.2% of citric acid and the balance of polycaprolactone; 2, preparing a cinnamyl aldehyde bamboo pulp antibacterial reinforcing agent from 4.8 to 8.2 percent of cinnamyl aldehyde, 22 to 36 percent of bamboo pulp, 7.5 to 10.6 percent of bio-based 1, 3-propylene glycol (PO3G) and the balance of water; 3, weighing the cinnamyl aldehyde bamboo pulp antibacterial reinforcing agent, the modified elastomer toughening agent and polylactic acid to prepare high-toughness polylactic acid; and 4, preparing the high-toughness transparent plastic cup from the high-toughness polylactic acid. The high-toughness transparent plastic cup is prepared by compounding the modified elastomer flexibilizer, the cinnamyl aldehyde bamboo pulp antibacterial enhancer and the polylactic acid, and has the advantages of high strength, excellent toughness, good staphylococcus aureus inhibition effect, biodegradability and the like.

Description

Technical Field

[0001] The invention relates to the technical field of plastic preparation, and in particular to a method for preparing a high-toughness transparent plastic cup. Background Art

[0002] With the development of plastics and growing awareness of environmental protection, plastics are gradually shifting towards biodegradability and recycling. In particular, the widespread use of single-use plastics, coupled with their difficulty in degradation and inadequate recycling, poses a significant threat to soil, water, marine ecosystems, and even human health.

[0003] Biodegradable plastics are primarily categorized by source, including petroleum-based plastics, bio-based plastics, and CO2-based plastics. Bio-based plastics are further divided into plant-based biodegradable plastics and microbial-based biodegradable plastics. Plant-based biodegradable plastics, such as polylactic acid (PLA), are plastic products made from plants.

[0004] Polylactic acid (PLA) possesses excellent mechanical strength and rigidity, with a transparency exceeding 90%. However, PLA suffers from poor toughness due to its slow crystallization rate. Therefore, PLA modification is necessary. Among the many modification methods, elastomer toughening is a common approach. However, this technology suffers from the technical bottleneck of "toughening without strengthening," making it difficult to achieve a synergistic improvement in toughness and strength.

[0005] Based on this, the present invention designs a method for preparing a high-toughness transparent plastic cup to solve the above problems. Summary of the Invention

[0006] In view of the above-mentioned shortcomings of the prior art, the present invention provides a method for preparing a high-toughness transparent plastic cup.

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0008] A method for preparing a high-toughness transparent plastic cup comprises the following steps:

[0009] 1. Preparation of modified elastomer toughening agent:

[0010] (1) Weigh 16.4-21.9% of isosorbide-based plasticizer, 2.2-2.6% of polydimethylsiloxane, 1.5-2.2% of citric acid, and the balance of polycaprolactone according to the following mass percentages;

[0011] (2) First, polycaprolactone and isosorbide-based plasticizer were mixed and subjected to simultaneous stretching treatment at 85-98 °C for 10-13 min, at a stretching rate of 60-80 mm / min, and a stretching ratio of 2-3 times;

[0012] (3) Finally, polydimethylsiloxane and citric acid powder were added, and the mixture was stretched simultaneously at 95-102 °C for 10-13 min, with a stretching rate of 30-50 mm / min and a stretching ratio of 1.5-2.2 times. The mixture was mixed at this temperature for 10-15 min, and the modified elastomer toughening agent was obtained after cooling.

[0013] 2. Preparation of cinnamaldehyde bamboo pulp antibacterial enhancer:

[0014] (1) Weigh cinnamaldehyde (4.8-8.2%), bamboo pulp (22-36%), bio-based 1,3-propylene glycol (PO3G) (7.5-10.6%) according to the following mass percentages, and the balance is water;

[0015] (2) adding bamboo pulp to deionized water, heating in a water bath to swell the bamboo pulp fibers, and filtering to obtain a bamboo pulp dispersion;

[0016] (3) mixing bio-based 1,3-propylene glycol and cinnamaldehyde to form a CA-PO3G mixture;

[0017] (4) Slowly adding the CA-PO3G mixture into the bamboo pulp dispersion, stirring, homogenizing and then drying to obtain the cinnamaldehyde bamboo pulp antibacterial enhancer;

[0018] 3. Weigh cinnamaldehyde bamboo pulp antibacterial enhancer, modified elastomer toughening agent and polylactic acid to prepare high-toughness polylactic acid:

[0019] 4. Use the above-mentioned high-toughness polylactic acid to prepare high-toughness transparent plastic cups.

[0020] Furthermore, in step 1, the isosorbide-based plasticizer is isosorbide dibutyrate or isosorbide dibutyrate.

[0021] Furthermore, in step 1, citric acid powder with a particle size of less than 74 μm is used.

[0022] Furthermore, in step 2, bamboo pulp is used.

[0023] Furthermore, in step 2, the mixture is stirred with a high-speed shearing machine for 15 to 20 minutes at a rotation speed of 10,000 to 12,000 rpm; and homogenized with a high-pressure homogenizer at 30 to 35° C. and 30 to 40 MPa.

[0024] Furthermore, in step three, 10-15% of cinnamaldehyde bamboo pulp antibacterial enhancer and 17-28% of modified elastomer toughening agent are weighed according to the following mass percentages, and the balance is polylactic acid.

[0025] Furthermore, in step three, polylactic acid and cinnamaldehyde bamboo pulp antibacterial enhancer are mixed at 40-60°C for 3-5 minutes, and then a modified elastomer toughening agent is added, and the mixture is continued for 10-15 minutes, and then melt-extruded to obtain high-toughness polylactic acid.

[0026] Furthermore, in step three, the temperature range of the extruder is: feeding section: 140~150°C; melting section: 160~170°C; mixing section: 170~180°C; reaction section: 180~190°C; and die head temperature: 170~180°C.

[0027] In order to better achieve the purpose of the present invention, the present invention also provides a high-toughness transparent plastic cup prepared according to the preparation method.

[0028] In order to better achieve the purpose of the present invention, the present invention also provides an application of a high-toughness transparent plastic cup in a disposable food container or a disposable medical product.

[0029] Compared with existing technologies, this invention offers the following advantages: Based on a modified elastomer toughening agent, cinnamaldehyde bamboo pulp antimicrobial enhancer, and polylactic acid, this invention produces a highly tough transparent plastic cup with high strength, excellent toughness, good Staphylococcus aureus inhibition, and satisfactory biodegradability. It is suitable for use in disposable food containers or disposable medical supplies. DETAILED DESCRIPTION

[0030] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0031] Example 1: A method for preparing a high-toughness transparent plastic cup, comprising the following steps:

[0032] 1. Preparation of modified elastomer toughening agent:

[0033] (1) Weigh 16.4% isosorbide-based plasticizer (isosorbide dibutyrate (SDB)), 2.6% polydimethylsiloxane, 1.5% citric acid, and the balance polycaprolactone (PCL) according to the following mass percentages;

[0034] (2) First, polycaprolactone and isosorbide-based plasticizer were mixed and subjected to simultaneous stretching treatment at 85 °C for 10 min, with a stretching rate of 80 mm / min and a stretching ratio of 2 times;

[0035] (3) Finally, polydimethylsiloxane and citric acid powder with a particle size of 72 μm were added, and the mixture was stretched simultaneously at 102 °C for 13 min, with a stretching rate of 30 mm / min and a stretching ratio of 2.2 times. The mixture was kept warm for 10 min and cooled to obtain the modified elastomer toughening agent.

[0036] 2. Preparation of cinnamaldehyde bamboo pulp antibacterial enhancer:

[0037] (1) Weigh cinnamaldehyde (CA) 4.8%, bamboo pulp 36%, bio-based 1,3-propylene glycol (PO3G) 7.5% according to the following mass percentages, and the balance is water;

[0038] (2) Add bamboo pulp to deionized water and heat in a water bath at 85 °C for 40 min to swell the bamboo pulp fibers. Filter and remove coarse fiber impurities with a particle size greater than 75 μm to obtain a bamboo pulp dispersion.

[0039] (3) Bio-based 1,3-propylene glycol and cinnamaldehyde were mixed and magnetically stirred at 30 °C to form a transparent CA-PO3G mixture;

[0040] (4) The CA-PO3G mixture was slowly added to the bamboo pulp dispersion and stirred with a high-speed shearing machine (speed 12000 rpm) for 15 min; then it was homogenized with a high-pressure homogenizer (35 ℃, 30 MPa) and dried to obtain the cinnamaldehyde bamboo pulp antibacterial enhancer.

[0041] 3. Preparation of high-toughness polylactic acid:

[0042] (1) Weigh 10% of cinnamaldehyde bamboo pulp antibacterial enhancer, 28% of modified elastomer toughening agent, and the balance of polylactic acid according to the following mass percentages;

[0043] (2) Polylactic acid (PLA) and cinnamaldehyde bamboo pulp antibacterial enhancer were mixed at 40 °C for 5 min, and then a modified elastomer toughening agent was added and mixed for 10 min. The mixture was then melt-extruded to obtain high-toughness PLA.

[0044] Extruder temperature range: feeding section: 140~150℃; melting section: 160~170℃; mixing section: 170~180℃; reaction section: 180~190℃; die head temperature: 170~180℃;

[0045] 4. Use the above-mentioned high-toughness polylactic acid to prepare high-toughness transparent plastic cups.

[0046] Example 2: A method for preparing a high-toughness transparent plastic cup, comprising the following steps:

[0047] 1. Preparation of modified elastomer toughening agent:

[0048] (1) Weigh 21.9% isosorbide-based plasticizer (isosorbide dienate (SDBE)), 2.2% polydimethylsiloxane, 2.2% citric acid, and the balance polycaprolactone (PCL) according to the following mass percentages;

[0049] (2) First, polycaprolactone and isosorbide-based plasticizer were mixed and subjected to simultaneous stretching treatment at 98 °C for 13 min, with a stretching rate of 60 mm / min and a stretching ratio of 3 times;

[0050] (3) Finally, polydimethylsiloxane and citric acid powder with a particle size of less than 70 μm were added, and the mixture was subjected to simultaneous stretching treatment at 95 °C for 10 min, a stretching rate of 50 mm / min, a stretching ratio of 1.5 times, and kept warm for 15 min. After cooling, the modified elastomer toughening agent was obtained.

[0051] 2. Preparation of cinnamaldehyde bamboo pulp antibacterial enhancer:

[0052] (1) Weigh 8.2% cinnamaldehyde (CA), 22% bamboo pulp, 10.6% bio-based 1,3-propylene glycol (PO3G) according to the following mass percentages, and the balance is water;

[0053] (2) Add bamboo pulp to deionized water and heat in a 90 °C water bath for 30 min to swell the bamboo pulp fibers. Filter and remove coarse fiber impurities with a particle size greater than 75 μm to obtain a bamboo pulp dispersion.

[0054] (3) Bio-based 1,3-propylene glycol and cinnamaldehyde were mixed and magnetically stirred at 35 °C to form a transparent CA-PO3G mixture;

[0055] (4) The CA-PO3G mixture was slowly added to the bamboo pulp dispersion and stirred with a high-speed shearing machine (speed 10,000 rpm) for 20 min; then homogenized with a high-pressure homogenizer (30 °C, 40 MPa) and dried to obtain the cinnamaldehyde bamboo pulp antibacterial enhancer.

[0056] 3. Preparation of high-toughness polylactic acid:

[0057] (1) Weigh 15% of cinnamaldehyde bamboo pulp antibacterial enhancer, 17% of modified elastomer toughening agent, and the balance of polylactic acid according to the following mass percentages;

[0058] (2) Polylactic acid (PLA) and cinnamaldehyde bamboo pulp antibacterial enhancer were mixed at 60 °C for 3 min, and then a modified elastomer toughening agent was added and mixed for 15 min. The mixture was then melt-extruded to obtain high-toughness PLA.

[0059] Extruder temperature range: feeding section: 140~150℃; melting section: 160~170℃; mixing section: 170~180℃; reaction section: 180~190℃; die head temperature: 170~180℃;

[0060] 4. Use the above-mentioned high-toughness polylactic acid to prepare high-toughness transparent plastic cups.

[0061] Example 3: A method for preparing a high-toughness transparent plastic cup, comprising the following steps:

[0062] 1. Preparation of modified elastomer toughening agent:

[0063] (1) Weigh 18.7% isosorbide-based plasticizer (isosorbide dibutyrate (SDB)), 2.4% polydimethylsiloxane, 2.0% citric acid, and the balance polycaprolactone (PCL) according to the following mass percentages;

[0064] (2) First, polycaprolactone and isosorbide-based plasticizer were mixed and subjected to simultaneous stretching treatment at 89 °C for 11 min, with a stretching rate of 70 mm / min and a stretching ratio of 2.5 times;

[0065] (3) Finally, polydimethylsiloxane and citric acid powder with a particle size of 65 μm were added, and the mixture was subjected to simultaneous stretching treatment at 100 °C for 12 min, a stretching rate of 40 mm / min, a stretching ratio of 1.8 times, and kept warm for 12 min. After cooling, the modified elastomer toughening agent was obtained.

[0066] 2. Preparation of cinnamaldehyde bamboo pulp antibacterial enhancer:

[0067] (1) Weigh 6.4% cinnamaldehyde (CA), 30% bamboo pulp, 8.8% bio-based 1,3-propylene glycol (PO3G) according to the following mass percentages, and the balance is water;

[0068] (2) Add bamboo pulp to deionized water and heat in a water bath at 88°C for 35 min to swell the bamboo pulp fibers. Filter and remove coarse fiber impurities with a particle size greater than 75 μm to obtain a bamboo pulp dispersion.

[0069] (3) Bio-based 1,3-propylene glycol and cinnamaldehyde were mixed and magnetically stirred at 32 °C to form a transparent CA-PO3G mixture;

[0070] (4) The CA-PO3G mixture was slowly added to the bamboo pulp dispersion and stirred with a high-speed shearing machine (speed 11000 rpm) for 18 min; then it was homogenized with a high-pressure homogenizer (32 ℃, 32 MPa) and dried to obtain cinnamaldehyde bamboo pulp antibacterial enhancer.

[0071] 3. Preparation of high-toughness polylactic acid:

[0072] (1) Weigh 13.5% of cinnamaldehyde bamboo pulp antibacterial enhancer, 25.6% of modified elastomer toughening agent, and the balance of polylactic acid according to the following mass percentages;

[0073] (2) Polylactic acid (PLA) and cinnamaldehyde bamboo pulp antibacterial enhancer were mixed at 50 °C for 4 min, and then a modified elastomer toughening agent was added and mixed for 12 min. The mixture was then melt-extruded to obtain high-toughness PLA.

[0074] Extruder temperature range: feeding section: 140~150℃; melting section: 160~170℃; mixing section: 170~180℃; reaction section: 180~190℃; die head temperature: 170~180℃;

[0075] 4. Use the above-mentioned high-toughness polylactic acid to prepare high-toughness transparent plastic cups.

[0076] Comparative Example 1: Compared to Example 3, the difference is that the two simultaneous stretching treatments are not performed during the preparation of the modified elastomer toughening agent. The other steps are the same. The preparation method of the modified elastomer toughening agent is as follows:

[0077] (1) Weigh 18.7% isosorbide-based plasticizer (isosorbide dibutyrate (SDB)), 2.4% polydimethylsiloxane, 2.0% citric acid, and the balance polycaprolactone (PCL) according to the following mass percentages;

[0078] (2) First, polycaprolactone and isosorbide-based plasticizer were mixed at 89 °C and subjected to simultaneous stretching treatment for 11 min;

[0079] (3) Finally, polydimethylsiloxane and citric acid powder with a particle size of 65 μm were added and mixed at 100 °C for 24 min. After cooling, the modified elastomer toughening agent was obtained.

[0080] Comparative Example 2: Compared to Example 3, the difference is that during the preparation of the modified elastomer toughening agent, a synchronous stretching treatment is performed. The other steps are the same. The preparation method of the modified elastomer toughening agent is as follows:

[0081] (1) Weigh 18.7% isosorbide-based plasticizer (isosorbide dibutyrate (SDB)), 2.4% polydimethylsiloxane, 2.0% citric acid, and the balance polycaprolactone (PCL) according to the following mass percentages;

[0082] (2) First, polycaprolactone and isosorbide-based plasticizer were mixed at 89 °C and subjected to simultaneous stretching treatment for 11 min;

[0083] (3) Finally, polydimethylsiloxane and citric acid powder with a particle size of 65 μm were added, and the mixture was stretched simultaneously at 100 °C for 12 min, with a stretching rate of 40 mm / min and a stretching ratio of 1.8 times. The mixture was kept warm for 12 min and cooled to obtain the modified elastomer toughening agent.

[0084] Comparative Example 3: Compared with Example 3, the difference is that in the cinnamaldehyde bamboo pulp antibacterial enhancer, the mass ratio of cinnamaldehyde: moso bamboo pulp: bio-based 1,3-propylene glycol is 6.4:20:18.8.

[0085] Comparative Example 4: Compared with Example 3, the difference is that the preparation method of the cinnamaldehyde bamboo pulp antibacterial enhancer is different, and the other steps are the same. The preparation method of the cinnamaldehyde bamboo pulp antibacterial enhancer is as follows:

[0086] (1) Weigh 6.4% cinnamaldehyde (CA), 30% bamboo pulp, 8.8% bio-based 1,3-propylene glycol (PO3G) according to the following mass percentages, and the balance is water;

[0087] (2) Add bamboo pulp to deionized water and heat in a water bath at 88°C for 35 min to swell the bamboo pulp fibers. Filter and remove coarse fiber impurities with a particle size greater than 75 μm to obtain a bamboo pulp dispersion.

[0088] (3) The bamboo pulp dispersion, bio-based 1,3-propylene glycol and cinnamaldehyde were mixed for 40 min and dried to obtain the cinnamaldehyde bamboo pulp antibacterial enhancer.

[0089] Experimental example:

[0090] The high-toughness transparent plastic cups prepared in Examples 1 to 3 and Comparative Examples 1 to 4 were subjected to the following performance tests:

[0091] 1. Tensile properties (GB / T 1040.2-2022, tensile rate 50 mm / min).

[0092] 2. Impact toughness (GB / T 9341-2008, notch 2mm, angle 45°).

[0093] 3. Antibacterial properties (GB / T 31402-2023): Staphylococcus aureus.

[0094] 4. Biodegradability (GB / T 41010-2021): Biodegradable under mature composting conditions (test period: 120 days).

[0095] The results are shown in Table 1.

[0096] Table 1 Performance test table

[0097] Serial number Tensile yield strength MPa Elongation at break % <![CDATA[Notch impact strength kJ / m 2 > Antibacterial rate% Biodegradation rate% Example 1 51.3 100.9 18.82 99.3 97.09 Example 2 53.7 97.4 20.14 99.5 96.27 Example 3 52.1 101.3 19.47 99.4 97.51 Comparative Example 1 45.2 64.2 9.17 99.3 96.15 Comparative Example 2 49.3 70.9 13.4 99.2 97.21 Comparative Example 3 52.2 89.4 15.67 94.4 95.07 Comparative Example 4 47.2 92.7 16.92 96.8 96.13

[0098] As can be seen from Table 1, the tensile yield strength of Examples 1 to 3 is stable at above 50 MPa; the elongation at break is 97.4-101.3%, with excellent toughness; and the notched impact strength is 18.82-20.14 kJ / m 2 , strong impact resistance; the antibacterial rate is 99.3~99.5%, and it has excellent inhibitory effect on Staphylococcus aureus; the biodegradation rate is 96.27~97.51%, and it has excellent biodegradability.

[0099] It can be seen from Example 3, Comparative Example 1 (lacking two simultaneous stretchings), and Comparative Example 2 (only one simultaneous stretching) that the lack of two simultaneous stretchings will result in insufficient orientation of the PCL molecular chains, the elastomer cannot form a uniformly dispersed microphase structure, and the strength and toughness are reduced. Although only one simultaneous stretching can increase the toughness to a certain extent, the improvement effect is limited; a reasonable design of the "two simultaneous stretching" process has a synergistic enhancement effect on toughness enhancement.

[0100] It can be seen from Example 3 and Comparative Example 3 (imbalanced ratio of cinnamaldehyde bamboo pulp antibacterial enhancer) that the reduction in the proportion of bamboo pulp leads to a reduction in bamboo pulp fiber, affecting the cinnamaldehyde loading effect. At the same time, the rigid support effect of bamboo pulp fiber is reduced, affecting the toughness and antibacterial effect.

[0101] It can be seen from Examples 1 to 3 and Comparative Example 4 that: pre-mixing bio-based 1,3-propylene glycol with cinnamaldehyde to form a CA-PO3G mixed liquid, and then stirring it with the bamboo pulp dispersion at high speed and homogenizing it under high pressure, can improve the stability of the antibacterial component, strengthen the bamboo pulp fiber to form a "rigid support point" in the matrix, avoid the agglomeration of bamboo pulp fibers, and further improve the strength, toughness and antibacterial effect.

[0102] This invention utilizes a modified elastomer toughening agent, cinnamaldehyde bamboo pulp antimicrobial enhancer, and polylactic acid to produce a highly tough transparent plastic cup. The cup exhibits high strength, excellent toughness, strong Staphylococcus aureus inhibition, and biodegradability. It is suitable for use in disposable food containers or medical supplies.

[0103] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A method for preparing a high-toughness transparent plastic cup, characterized in that: The following steps are involved:

1. Preparation of modified elastomer toughening agent: (1) Weigh 16.4-21.9% of isosorbide-based plasticizer, 2.2-2.6% of polydimethylsiloxane, 1.5-2.2% of citric acid, and the balance of polycaprolactone according to the following mass percentages; (2) First, polycaprolactone and isosorbide-based plasticizer were mixed and subjected to simultaneous stretching treatment at 85-98 °C for 10-13 min, at a stretching rate of 60-80 mm / min, and a stretching ratio of 2-3 times; (3) Finally, polydimethylsiloxane and citric acid powder were added, and the mixture was stretched simultaneously at 95-102 °C for 10-13 min, with a stretching rate of 30-50 mm / min and a stretching ratio of 1.5-2.2 times. The mixture was mixed at this temperature for 10-15 min, and the modified elastomer toughening agent was obtained after cooling.

2. Preparation of cinnamaldehyde bamboo pulp antibacterial enhancer: (1) Weigh cinnamaldehyde (4.8-8.2%), bamboo pulp (22-36%), bio-based 1,3-propylene glycol (PO3G) (7.5-10.6%) according to the following mass percentages, and the balance is water; (2) adding bamboo pulp to deionized water, heating in a water bath to swell the bamboo pulp fibers, and filtering to obtain a bamboo pulp dispersion; (3) mixing bio-based 1,3-propylene glycol and cinnamaldehyde to form a CA-PO3G mixture; (4) Slowly adding the CA-PO3G mixture into the bamboo pulp dispersion, stirring, homogenizing and then drying to obtain the cinnamaldehyde bamboo pulp antibacterial enhancer; 3. Weigh cinnamaldehyde bamboo pulp antibacterial enhancer, modified elastomer toughening agent and polylactic acid to prepare high-toughness polylactic acid:

4. Use the above-mentioned high-toughness polylactic acid to prepare high-toughness transparent plastic cups.

2. The method for preparing a high-toughness transparent plastic cup according to claim 1, characterized in that: In step 1, the isosorbide-based plasticizer is isosorbide dibutyrate or isosorbide dibutyrate.

3. The method for preparing a high-toughness transparent plastic cup according to claim 1, characterized in that: In step 1, citric acid powder with a particle size of less than 74 μm is used.

4. The method for preparing a high-toughness transparent plastic cup according to claim 1, characterized in that: In step 2, bamboo pulp is used.

5. The method for preparing a high-toughness transparent plastic cup according to claim 1, characterized in that: In step 2, the mixture is stirred with a high-speed shearing machine for 15 to 20 minutes at a speed of 10,000 to 12,000 rpm; and homogenized with a high-pressure homogenizer at 30 to 35°C and 30 to 40 MPa.

6. The method for preparing a high-toughness transparent plastic cup according to claim 1, characterized in that: In step 3, 10-15% of cinnamaldehyde bamboo pulp antibacterial enhancer, 17-28% of modified elastomer toughening agent, and the balance of polylactic acid are weighed according to the following mass percentages.

7. The method for preparing a high-toughness transparent plastic cup according to claim 6, characterized in that: In step three, polylactic acid and cinnamaldehyde bamboo pulp antibacterial enhancer are mixed at 40-60°C for 3-5 minutes, and then a modified elastomer toughening agent is added, and the mixture is further mixed for 10-15 minutes, and then melt-extruded to obtain high-toughness polylactic acid.

8. The method for preparing a high-toughness transparent plastic cup according to claim 7, characterized in that: In step 3, the extruder temperature range is: feeding section: 140~150℃; melting section: 160~170℃; mixing section: 170~180℃; Reaction section: 180~190 ℃; head temperature: 170~180 ℃.

9. A high-toughness transparent plastic cup prepared according to the preparation method according to any one of claims 1 to 8.

10. Use of the high-toughness transparent plastic cup according to claim 9 in disposable food containers or disposable medical supplies.