A bio-based degradable cosmetic plastic packaging bottle and its preparation method

Abstract

This invention belongs to the technical field of plastic packaging bottles, specifically relating to a bio-based degradable cosmetic plastic packaging bottle and its preparation method. The packaging bottle is prepared from the following raw materials in parts by weight: 60-80 parts of compounded polylactic acid; 10-25 parts of polybutylene adipate terephthalate; 10-20 parts of modified bamboo powder; 2-8 parts of epoxidized soybean oil; 1-2 parts of anti-hydrolysis agent; 0.1-0.5 parts of antioxidant; and 0.1-0.5 parts of opening agent. The packaging bottle prepared by this invention simultaneously possesses high tensile strength, elongation at break, flexural strength, and notched impact strength, and exhibits excellent weather resistance.

Description

Technical Field

[0001] This invention belongs to the field of plastic packaging bottle technology, specifically relating to a bio-based degradable cosmetic plastic packaging bottle and its preparation method. Background Technology

[0002] With the cosmetics industry placing increasing emphasis on environmental protection and sustainable development, the application of bio-based biodegradable materials in cosmetic packaging has become a research hotspot. Polylactic acid (PLA), an aliphatic polyester derived from renewable biomass, possesses excellent biodegradability and biocompatibility, and is widely regarded as a potential alternative to traditional petroleum-based plastics. However, pure PLA materials suffer from drawbacks such as high brittleness, poor heat resistance, and slow crystallization rate. Especially in humid environments or when in contact with water-based cosmetics, its poor weather resistance leads to a decline in mechanical properties, limiting its practical application in cosmetic packaging bottles.

[0003] To improve the mechanical properties and weather resistance of PLA, existing technologies attempt to introduce plant fibers such as bamboo fiber, kenaf fiber, and flax fiber into the PLA matrix to prepare composite materials, thereby enhancing their strength and stiffness. However, the interfacial compatibility between PLA and plant fibers is poor, and the fibers are prone to agglomeration, leading to decreased toughness and insufficient impact resistance in the composite material. Therefore, existing technologies often add compatibilizers such as polycaprolactone, maleic anhydride grafts, or coupling agents to improve interfacial bonding, but this often comes at the cost of sacrificing the material's elongation at break and impact strength, making it difficult to simultaneously achieve high strength and high toughness. In some high-temperature and high-humidity regions, the long-term weather resistance of this composite material still needs further optimization.

[0004] Therefore, developing a bio-based biodegradable cosmetic plastic packaging bottle with excellent comprehensive mechanical properties has important practical application value. Summary of the Invention

[0005] The purpose of this invention is to provide a bio-based degradable cosmetic plastic packaging bottle and its preparation method. The packaging bottle prepared by this invention has high tensile strength, elongation at break, flexural strength and notched impact strength, and excellent weather resistance.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A bio-based biodegradable cosmetic plastic packaging bottle, the packaging bottle being prepared from the following raw materials in parts by weight: 60-80 parts of compounded polylactic acid; 10-25 parts of polybutylene adipate terephthalate; 10-20 parts of modified bamboo powder; 2-8 parts of epoxidized soybean oil; 1-2 parts of anti-hydrolysis agent; 0.1-0.5 parts of antioxidant; and 0.1-0.5 parts of opening agent.

[0007] Preferably, the compounded polylactic acid includes polylactic acid I, polylactic acid II, and polylactic acid III; polylactic acid I has a melt index of 10-12 g / 10 min and a melting temperature of 155-170 °C at 190 °C / 2.16 kg; polylactic acid II has a melt index of 5-7 g / 10 min and a melting temperature of 145-160 °C at 190 °C / 2.16 kg; and polylactic acid III has a melt index of 70-85 g / 10 min at 190 °C / 2.16 kg.

[0008] Preferably, the compounded polylactic acid includes polylactic acid I, polylactic acid II and polylactic acid III in a mass ratio of (1.3-1.5):1:(0.3-0.5).

[0009] Preferred polylactic acid (PLA) grades: Total Luminy LX175 (Thailand), with a melt index of 10 g / 10 min at 190℃ / 2.16 kg and a melting temperature of 158℃. Preferred polylactic acid (PLA) grades: NatureWorks 7001D (USA), with a melt index of 6 g / 10 min at 190℃ / 2.16 kg, a melting temperature of 147℃, and a specific gravity of 1.24 g / cm³. 3 Polylactic acid III (PLA) grade: NatureWorks 6252D (USA), melt index 79 g / 10 min at 190℃ / 2.16 kg, specific gravity 1.24 g / cm³. 3 .

[0010] Existing technologies using single polylactic acid (PLA) or blends of two PLAs suffer from drawbacks such as high brittleness, low elongation at break, and uneven mechanical strength, failing to simultaneously achieve high tensile strength and good toughness. This invention uses a blend of three different PLAs in a specific ratio, improving both tensile strength and elongation at break. The analysis shows that low melt flow index (MFI) PLA provides rigidity and strength, medium MFI PLA provides stable processing and mechanical foundation, and high MFI PLA improves flowability and toughness. These three components work synergistically to achieve a balance between high strength and high toughness, solving the brittleness problem of single PLA.

[0011] Preferably, the method for preparing the modified bamboo powder includes the following steps: (1) Wash and dry 100-mesh bamboo powder to obtain washed bamboo powder; (2) Mix the cleaned bamboo powder with water, adjust the pH, sterilize, and obtain a mixture; add mixed bacteria to the mixture, the mixed bacteria including Aspergillus niger, Bacillus subtilis and Protozoa chrysophagus, aerobic ferment at 30-35℃ for 6-8 days, sterilize, centrifuge, collect solid bamboo powder, clean, dry, and obtain modified bamboo powder.

[0012] Preferably, the dosage of the mixed bacteria is (3-5) × 10⁻⁶. 8The CFU / mL mixture comprises Aspergillus niger, Bacillus subtilis, and Protozoa chrysospora in a live count ratio of (0.5-0.6):1:(1.3-1.5).

[0013] Existing technologies that directly add bamboo powder suffer from drawbacks such as poor interfacial compatibility between PLA and bamboo powder, easy fiber agglomeration, and low notched impact strength. This invention uses a composite modification of bamboo powder with *Aspergillus niger*, *Bacillus subtilis*, and *Procambarus chrysospora* at a specific viable bacteria ratio, improving notched impact strength and interfacial bonding. Analysis shows that the three bacteria synergistically degrade hemicellulose and lignin on the bamboo powder surface, exposing more active groups, improving compatibility with the matrix, reducing stress concentration, and significantly enhancing impact resistance.

[0014] Preferably, the melt index of polybutylene adipate-terephthalate is 4-5 g / 10 min at 190℃ / 2.16 kg.

[0015] During the research and development process, it was unexpectedly discovered that the PBAT system of this invention, with a melt index of 4-5 g / 10 min at 190℃ / 2.16 kg, improved flexural strength and weather resistance. Analysis showed that PBAT with this parameter has good viscosity matching and processing compatibility with the compounded PLA, and can more uniformly coat the modified bamboo powder to form a continuous tough interface layer, which not only enhances flexural performance but also prevents moisture intrusion. The synergy between PBAT, compounded PLA, and modified bamboo powder can better achieve a balance of high strength, high toughness, and excellent weather resistance.

[0016] Preferably, the anti-hydrolysis agent is a polycarbodiimide anti-hydrolysis agent.

[0017] Preferably, the antioxidant includes antioxidant 1010 and antioxidant 168.

[0018] Preferably, the opening agent is erucamide.

[0019] The method for preparing the bio-based degradable cosmetic plastic packaging bottle includes the following steps: (1) Add compounded polylactic acid, modified bamboo powder and polybutylene adipate to a mixer and mix. Then add epoxidized soybean oil, anti-hydrolysis agent, antioxidant and opening agent in sequence and continue mixing. Use a co-rotating twin-screw extruder to melt extrude, then stretch, air cool and pelletize to obtain bio-based degradable composite material granules for packaging bottles. (2) The bio-based degradable composite material granules for packaging bottles are dried, and then injection molded using an injection molding machine equipped with a cosmetic packaging bottle mold to obtain bio-based degradable cosmetic plastic packaging bottles. Compared with the prior art, the advantages and beneficial effects of the present invention are as follows: 1. This invention uses three polylactic acids with different melt indices blended in a specific ratio to improve tensile strength and elongation at break.

[0020] 2. This invention uses Aspergillus niger, Bacillus subtilis, and Protozoa chrysospora in a specific ratio of live bacteria to modify bamboo powder, thereby improving notched impact strength and interfacial bonding strength.

[0021] 3. The system of this invention uses PBAT with a melt index of 4-5 g / 10 min at 190℃ / 2.16 kg, which improves flexural strength and weather resistance. Detailed Implementation

[0022] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] All raw materials used in the following embodiments of the present invention are commercially available products: The strain numbers of Aspergillus niger (CICC 40048), Bacillus subtilis (CICC 10732), and Proteobacterium chrysosporium (CICC 14076) are from the China Industrial Microbial Culture Collection Center.

[0024] The anti-hydrolysis agent is polycarbodiimide anti-hydrolysis agent AQ-AHA501. Tianjin Aoluoqi Chemical Technology Co., Ltd.

[0025] The antioxidant is a mixture of antioxidant 1010 and antioxidant 168 in a mass ratio of 2:3.

[0026] The opening agent is erucamide. Example 1

[0027] This embodiment provides a bio-based biodegradable cosmetic plastic packaging bottle, which is prepared from the following raw materials in parts by weight: 70 parts of compounded polylactic acid; 18 parts of polybutylene adipate terephthalate; 14 parts of modified bamboo powder; 6 parts of epoxidized soybean oil; 1.5 parts of anti-hydrolysis agent; 0.4 parts of antioxidant; and 0.3 parts of opening agent.

[0028] The compounded polylactic acid (PLA) includes PLA I, PLA II, and PLA III in a mass ratio of 1.4:1:0.4. PLA I is model Total Luminy LX175 (Thailand), with a melt index of 10 g / 10 min at 190℃ / 2.16 kg and a melting temperature of 158℃, supplied by Dongguan Suyun Plastics Co., Ltd. PLA II is model NatureWorks 7001D (USA), with a melt index of 6 g / 10 min at 190℃ / 2.16 kg, a melting temperature of 147℃, and a specific gravity of 1.24 g / cm³. 3The supplier is Dongguan Suyun Plastics Co., Ltd. The polylactic acid III model is NatureWorks 6252D (USA), with a melt flow index of 79 g / 10 min at 190℃ / 2.16 kg and a specific gravity of 1.24 g / cm³. 3 Supplier: Shanghai Kaiyin Chemical Co., Ltd.

[0029] Polybutylene adipate terephthalate (PAT) is designated as A400, with a melt index of 4 g / 10 min at 190℃ / 2.16 kg. It is manufactured by Kingfa Science & Technology Co., Ltd.

[0030] The preparation method of the modified bamboo powder includes the following steps: (1) Wash the 100-mesh bamboo powder with water three times and dry it at 102℃ for 54 hours to obtain the washed bamboo powder; (2) Mix the washed bamboo powder and water at a mass ratio of 1:7, adjust the pH to 6.0 using a buffer solution, sterilize, and obtain a mixture; add mixed bacteria to the mixture, the amount of mixed bacteria being 4×10 8 The mixture of CFU / mL bacteria, comprising Aspergillus niger, Bacillus subtilis, and Protozoa chrysospora in a live bacteria ratio of 0.5:1:1.3, was aerobic fermented for 7 days with an aeration rate of 1.0 vvm. After sterilization, centrifugation was performed, and the solid bamboo powder was collected. The powder was washed with water until neutral and dried at 102°C for 54 hours to obtain modified bamboo powder.

[0031] The above-mentioned method for preparing bio-based degradable cosmetic plastic packaging bottles includes the following steps: (1) Add compounded polylactic acid, modified bamboo powder, and polybutylene adipate-terephthalate to a mixer and mix at 110°C for 15 min. Then add epoxidized soybean oil, anti-hydrolysis agent, antioxidant, and opening agent to the mixer in sequence and continue mixing for 5 min. Use a co-rotating twin-screw extruder with a length-to-diameter ratio (L / D) of 40. Set the temperature as follows: feeding section: 140°C, melting section: 155°C, mixing section: 160°C, metering section: 165°C, die head temperature: 150°C, screw speed: 300 rpm, and feeding speed: 5 kg / h. After melt extrusion, stretch the material into strips, air cool, and pelletize to obtain bio-based degradable composite material granules for packaging bottles. (2) The bio-based degradable composite material granules for packaging bottles are dried in a vacuum oven at 80°C for 4 hours, and then injection molded using an injection molding machine equipped with a cosmetic packaging bottle mold to obtain bio-based degradable cosmetic plastic packaging bottles. Example 2

[0032] This embodiment provides a bio-based biodegradable cosmetic plastic packaging bottle, which is prepared from the following raw materials in parts by weight: 60 parts of compounded polylactic acid; 10 parts of polybutylene adipate-terephthalate; 10 parts of modified bamboo powder; 3 parts of epoxidized soybean oil; 1 part of anti-hydrolysis agent; 0.1 part of antioxidant; and 0.1 part of opening agent.

[0033] The compounded polylactic acid (PLA) includes PLA I, PLA II, and PLA III in a mass ratio of 1.3:1:0.5. PLA I is model Total Luminy LX175 (Thailand), with a melt index of 10 g / 10 min at 190℃ / 2.16 kg and a melting temperature of 158℃, supplied by Dongguan Suyun Plastics Co., Ltd. PLA II is model NatureWorks 7001D (USA), with a melt index of 6 g / 10 min at 190℃ / 2.16 kg, a melting temperature of 147℃, and a specific gravity of 1.24 g / cm³. 3 The supplier is Dongguan Suyun Plastics Co., Ltd. The polylactic acid III model is NatureWorks 6252D (USA), with a melt flow index of 79 g / 10 min at 190℃ / 2.16 kg and a specific gravity of 1.24 g / cm³. 3 Supplier: Shanghai Kaiyin Chemical Co., Ltd.

[0034] Polybutylene adipate terephthalate (PAT) is designated as A400, with a melt index of 4 g / 10 min at 190℃ / 2.16 kg. It is manufactured by Kingfa Science & Technology Co., Ltd.

[0035] The preparation method of the modified bamboo powder includes the following steps: (1) Wash the 100-mesh bamboo powder with water three times and dry it at 102℃ for 54 hours to obtain the washed bamboo powder; (2) Mix the washed bamboo powder and water at a mass ratio of 1:7, adjust the pH to 6.0 using a buffer solution, sterilize, and obtain a mixture; add mixed bacteria to the mixture, the amount of mixed bacteria being 5×10 8 The mixture of CFU / mL bacteria, comprising Aspergillus niger, Bacillus subtilis, and Protozoa chrysospora in a live bacteria ratio of 0.6:1:1.5, was aerobic fermented for 8 days at an aeration rate of 1.0 vvm. After sterilization, centrifugation was performed to collect the solid bamboo powder, which was then washed with water until neutral and dried at 102°C for 54 hours to obtain modified bamboo powder.

[0036] The above-mentioned method for preparing bio-based degradable cosmetic plastic packaging bottles includes the following steps: (1) Add compounded polylactic acid, modified bamboo powder, and polybutylene adipate-terephthalate to a mixer and mix at 110°C for 15 min. Then add epoxidized soybean oil, anti-hydrolysis agent, antioxidant, and opening agent to the mixer in sequence and continue mixing for 5 min. Use a co-rotating twin-screw extruder with a length-to-diameter ratio (L / D) of 40. Set the temperature as follows: feeding section: 140°C, melting section: 155°C, mixing section: 160°C, metering section: 165°C, die head temperature: 150°C, screw speed: 300 rpm, and feeding speed: 5 kg / h. After melt extrusion, stretch the material into strips, air cool, and pelletize to obtain bio-based degradable composite material granules for packaging bottles. (2) The bio-based degradable composite material granules for packaging bottles are dried in a vacuum oven at 80°C for 4 hours, and then injection molded using an injection molding machine equipped with a cosmetic packaging bottle mold to obtain bio-based degradable cosmetic plastic packaging bottles.

[0037] Comparative Example 1 The difference between this comparative example and Example 1 is that the compounded polylactic acid was replaced with Total Luminy LX175 from Thailand, with a melt index of 10 g / 10 min at 190℃ / 2.16 kg and a melt temperature of 158℃, supplied by Dongguan Suyun Plastics Co., Ltd.

[0038] Comparative Example 2 The difference between this comparative example and Example 1 is as follows: the compounded polylactic acid includes polylactic acid I and polylactic acid II in a mass ratio of 1.4:1; the polylactic acid I is of the Thai Total Luminy LX175 type, with a melt index of 10 g / 10 min at 190℃ / 2.16 kg, a melting temperature of 158℃, and is supplied by Dongguan Suyun Plastics Co., Ltd.; the polylactic acid II is of the American NatureWorks 7001D type, with a melt index of 6 g / 10 min at 190℃ / 2.16 kg, a melting temperature of 147℃, and a specific gravity of 1.24 g / cm³. 3 The supplier is Dongguan Suyun Plastics Co., Ltd.

[0039] Comparative Example 3 The difference between this comparative example and Example 1 is as follows: the compounded polylactic acid includes polylactic acid I, polylactic acid II, and polylactic acid III in a mass ratio of 1:1.2:0.7; the polylactic acid I is of the type Total Luminy LX175 from Thailand, with a melt index of 10 g / 10 min at 190℃ / 2.16 kg, a melting temperature of 158℃, and is supplied by Dongguan Suyun Plastics Co., Ltd.; the polylactic acid II is of the type NatureWorks 7001D from the USA, with a melt index of 6 g / 10 min at 190℃ / 2.16 kg, a melting temperature of 147℃, and a specific gravity of 1.24 g / cm³. 3The supplier is Dongguan Suyun Plastics Co., Ltd. The polylactic acid III model is NatureWorks 6252D (USA), with a melt flow index of 79 g / 10 min at 190℃ / 2.16 kg and a specific gravity of 1.24 g / cm³. 3 Supplier: Shanghai Kaiyin Chemical Co., Ltd.

[0040] Comparative Example 4 The difference between this comparative example and Example 1 is as follows: the compounded polylactic acid includes polylactic acid I, polylactic acid II, and polylactic acid III in a mass ratio of 1.7:0.8:0.1; the polylactic acid I is of the type Total Luminy LX175 from Thailand, with a melt index of 10 g / 10 min at 190℃ / 2.16 kg, a melting temperature of 158℃, and is supplied by Dongguan Suyun Plastics Co., Ltd.; the polylactic acid II is of the type NatureWorks 7001D from the USA, with a melt index of 6 g / 10 min at 190℃ / 2.16 kg, a melting temperature of 147℃, and a specific gravity of 1.24 g / cm³. 3 The supplier is Dongguan Suyun Plastics Co., Ltd. The polylactic acid III model is NatureWorks 6252D (USA), with a melt flow index of 79 g / 10 min at 190℃ / 2.16 kg and a specific gravity of 1.24 g / cm³. 3 Supplier: Shanghai Kaiyin Chemical Co., Ltd.

[0041] Comparative Example 5 The difference between this comparative example and Example 1 is that the polybutylene adipate terephthalate II used is model BT12-203 from Changchun, Taiwan, with a melt index of 3.4 g / 10 min at 190℃ / 2.16 kg. The supplier is Dongguan Zhidi Plastic Raw Materials Co., Ltd.

[0042] Comparative Example 6 The difference between this comparative example and Example 1 is that the preparation method of the modified bamboo powder includes the following steps: (1) Wash the 100-mesh bamboo powder with water three times and dry it at 102℃ for 54 hours to obtain the washed bamboo powder; (2) Mix the washed bamboo powder and water at a mass ratio of 1:7, adjust the pH to 6.0 using a buffer solution, sterilize, and obtain a mixture; add mixed bacteria to the mixture, the amount of mixed bacteria being 4×10 8 The mixture of CFU / mL bacteria, comprising Aspergillus niger and Bacillus subtilis in a live bacteria ratio of 0.5:1, was aerobic fermented for 7 days with an aeration rate of 1.0 vvm. After sterilization, centrifugation was performed, and the solid bamboo powder was collected. The mixture was washed with water until neutral and dried at 102°C for 54 hours to obtain modified bamboo powder.

[0043] Comparative Example 7 The difference between this comparative example and Example 1 is that the mixed bacteria include Aspergillus niger, Bacillus subtilis and Protozoa chrysophagus in a live bacteria ratio of 1:1:1.

[0044] Performance testing The performance of the bio-based degradable composite material granules for packaging bottles prepared in Examples 1-2 and Comparative Examples 1-7 was tested.

[0045] 1. Tensile property test: GB / T1040.1-2025 "Determination of tensile properties of plastics", tensile strength is A0; 2. Bending performance test: GB / T9341-2024 "Determination of bending properties of plastics"; 3. Cantilever beam impact performance test: GB / T1843-2008 "Determination of impact strength of plastic cantilever beams"; 4. Weather resistance test: After being placed in an environment with a temperature of 40℃ and a relative humidity of 95% for 250 hours, its mechanical properties A1 are tested, and the tensile strength retention rate (%) is calculated as A1 ÷ A0 × 100%.

[0046] The results are shown in Table 1.

[0047] Table 1 Performance Test Results As shown in Table 1, the bio-based degradable cosmetic plastic packaging bottles prepared in Examples 1-2 exhibit excellent comprehensive mechanical properties and weather resistance. Specifically, the tensile strength is 105-107 MPa, the elongation at break is 4.55-4.71%, the flexural strength is 111-115 MPa, and the notched impact strength is 6.2-6.4 KJ / m. 2 It retains 94-95% of its tensile strength under high temperature and high humidity conditions, and also possesses high tensile strength, high elongation at break, high flexural strength, high notched impact strength and excellent weather resistance, meeting the actual use requirements of cosmetic packaging bottles.

[0048] Comparative Example 1: Replacing the compounded polylactic acid with single polylactic acid resulted in a decrease in various properties compared to Example 1, indicating that single PLA is brittle, has poor toughness and weather resistance, and cannot meet the application requirements. Comparative Example 2: Not using high melt flow index PLA III, but only using a compound of two PLAs, resulted in a significant decrease in elongation at break, notched impact strength, and weather resistance, indicating that high melt flow index PLA III is indispensable for improving the material's toughness, interfacial compatibility, and weather resistance. Comparative Example 3: Changing the compound ratio of the three PLAs, so that the ratio of PLA II to PLA III exceeds the limits of this invention, resulted in a slight decrease in tensile strength, flexural strength, and toughness, indicating that only a specific ratio can achieve a balance between strength and toughness. In Comparative Example 4: Excessive PLA I and insufficient PLA III caused an increase in material brittleness and a significant decrease in toughness and weather resistance. Comparative Example 5 used a PBAT model with a low melt flow index, resulting in a decrease in various properties compared to Example 1, indicating that only PBAT with a specific melt flow index can form a good synergistic effect with the compounded PLA and modified bamboo powder; Comparative Example 6's modified bamboo powder lacked Protozoa chrysospora, resulting in a decrease in various properties compared to Example 1, indicating that only the composite modification of the three fungi can effectively improve the interfacial bonding between bamboo powder and the matrix; Comparative Example 7 changed the ratio of the three fungi to an equal mixture, resulting in a decrease in various properties, indicating that only a specific ratio of fungi can achieve the best modification effect on bamboo powder.

[0049] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A bio-based biodegradable cosmetic plastic packaging bottle, characterized in that, The packaging bottle is prepared from the following raw materials in parts by weight: 60-80 parts of compounded polylactic acid; 10-25 parts of polybutylene adipate terephthalate; 10-20 parts of modified bamboo powder; 2-8 parts of epoxidized soybean oil; 1-2 parts of anti-hydrolysis agent; and 0.1-0.5 parts of antioxidant. 0.1 to 0.5 parts of opening agent.

2. The bio-based degradable cosmetic plastic packaging bottle according to claim 1, characterized in that, The compound polylactic acid includes polylactic acid I, polylactic acid II, and polylactic acid III; polylactic acid I has a melt index of 10-12 g / 10 min at 190℃ / 2.16 kg and a melting temperature of 155-170℃; polylactic acid II has a melt index of 5-7 g / 10 min at 190℃ / 2.16 kg and a melting temperature of 145-160℃; and polylactic acid III has a melt index of 70-85 g / 10 min at 190℃ / 2.16 kg.

3. The bio-based degradable cosmetic plastic packaging bottle according to claim 2, characterized in that, The compound polylactic acid includes polylactic acid I, polylactic acid II and polylactic acid III in a mass ratio of (1.3-1.5):1:(0.3-0.5).

4. The bio-based degradable cosmetic plastic packaging bottle according to claim 1, characterized in that, The preparation method of the modified bamboo powder includes the following steps: (1) The bamboo powder is washed and dried to obtain the washed bamboo powder; (2) Mix the cleaned bamboo powder with water, adjust the pH, sterilize, and obtain a mixture; add mixed bacteria to the mixture, the mixed bacteria including Aspergillus niger, Bacillus subtilis and Protozoa chrysophagus, aerobic ferment at 30-35℃ for 6-8 days, sterilize, centrifuge, collect solid bamboo powder, clean, dry, and obtain modified bamboo powder.

5. The bio-based degradable cosmetic plastic packaging bottle according to claim 4, characterized in that, The dosage of the mixed bacteria is (3-5) × 10. 8 The CFU / mL mixture comprises Aspergillus niger, Bacillus subtilis, and Protozoa chrysospora in a live count ratio of (0.5-0.6):1:(1.3-1.5).

6. The bio-based degradable cosmetic plastic packaging bottle according to claim 1, characterized in that, Polybutylene adipate terephthalate has a melt index of 4-5 g / 10 min at 190℃ / 2.16 kg.

7. The bio-based degradable cosmetic plastic packaging bottle according to claim 1, characterized in that, The anti-hydrolysis agent is polycarbodiimide.

8. The bio-based degradable cosmetic plastic packaging bottle according to claim 1, characterized in that, The antioxidants include antioxidant 1010 and antioxidant 168.

9. The bio-based degradable cosmetic plastic packaging bottle according to claim 1, characterized in that, The opening agent is erucamide.

10. A method for preparing a bio-based degradable cosmetic plastic packaging bottle according to any one of claims 1-9, characterized in that, Includes the following steps: (1) Add compounded polylactic acid, modified bamboo powder and polybutylene adipate to a mixer and mix. Then add epoxidized soybean oil, anti-hydrolysis agent, antioxidant and opening agent in sequence and continue mixing. Use a co-rotating twin-screw extruder to melt extrude, then stretch, air cool and pelletize to obtain bio-based degradable composite material granules for packaging bottles. (2) Dry the bio-based degradable composite material granules for packaging bottles, and use an injection molding machine equipped with a cosmetic packaging bottle mold to perform injection molding to obtain bio-based degradable cosmetic plastic packaging bottles.

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