Handicraft material based on polyester degradable plastic and preparation method of handicraft material

Abstract

The invention discloses an artware material based on polyester degradable plastics and a preparation method thereof. The material is prepared from the following components in parts by weight: 50-80 parts of polyester degradable resin, 5-15 parts of a plasticizer, 10-25 parts of a natural plant fiber reinforcing agent with the length of 0.5-5mm and the diameter of 5-50 microns, 3-8 parts of a compatilizer, 0.5-2 parts of an antioxidant, 0.5-2 parts of a light stabilizer and 0.1-1 part of an antibacterial agent. The natural plant fiber reinforcing agent is pretreated by a coupling agent solution, and the material is prepared by melt blending in a twin-screw extruder with a specific length-diameter ratio. Through optimization of the formula and process parameters, the material has good degradability, mechanical strength, surface smoothness and dimensional stability, and also has aging resistance, antibacterial property and the like. The preparation method comprises the steps of natural fiber pretreatment, premixing, melt blending, granulation and the like, and the synergistic effect of all parameters ensures good dispersion and interface bonding of the fibers.

Description

Technical Field

[0001] This invention relates to the field of polyester biodegradable plastics technology, specifically to a craft material based on polyester biodegradable plastics and its preparation method. Background Technology

[0002] Traditional handicraft materials often use non-degradable plastics, such as polyethylene and polypropylene, leading to serious environmental problems. While biodegradable plastics like polyesters offer environmental advantages, their mechanical and processing properties often fail to meet the requirements of handicraft manufacturing. Natural plant fiber-reinforced biodegradable plastics represent a promising solution, but face challenges such as poor fiber-resin compatibility and uneven dispersion. Currently, there is a lack of a systematic approach to address these issues while simultaneously meeting the stringent requirements of handicrafts for surface finish, mechanical strength, and dimensional stability.

[0003] To this end, a high-performance biodegradable craft material and its preparation method are proposed. Summary of the Invention

[0004] The present invention aims to solve the problems mentioned in the background art by providing a craft material based on polyester biodegradable plastic and its preparation method.

[0005] The specific technical solution is as follows:

[0006] A craft material based on polyester biodegradable plastic, comprising the following components by weight:

[0007] 50-80 parts of biodegradable polyester resin;

[0008] Plasticizer 5-15 parts;

[0009] 10-25 parts of natural plant fiber reinforcing agent with a length of 0.5-5mm and a diameter of 5-50μm;

[0010] 3-8 parts compatibilizer;

[0011] Antioxidant 0.5-2 parts;

[0012] Light stabilizer 0.5-2 parts;

[0013] Antibacterial agent 0.1-1 part;

[0014] The natural plant fiber reinforcing agent is selected from one or more of bamboo fiber, hemp fiber, wood fiber, and coconut fiber. The natural plant fiber reinforcing agent is pretreated by soaking in a 3-8 wt% coupling agent solution for 1-3 hours before being added, and then dried at 80-100℃ to constant weight.

[0015] The composite material is prepared in a twin-screw extruder with an aspect ratio of 30-40, a melt blending temperature of 160-200℃, and a screw speed of 200-400 r / min to obtain granules with good surface finish, mechanical strength, and dimensional stability suitable for the manufacture of handicrafts.

[0016] By adopting the above technical solution, a balance between biodegradability and processability is achieved through a combination of polyester resin, plasticizer, fiber reinforcing agent and functional additives in a specific ratio. At the same time, the pretreatment of natural fiber reinforcing agent improves the interfacial bonding force and enhances the mechanical and processing properties of the material.

[0017] The aforementioned craft materials based on polyester biodegradable plastics, wherein the polyester biodegradable resin is one or a mixture of polylactic acid (PLA), polyhydroxyalkanoates (PHA), polybutylene succinate (PBS), and polybutylene terephthalate-adipate (PBAT). By employing the above technical solution, a blend of multiple biodegradable polyester resins is used, taking into account material strength, toughness, and processing fluidity, thus meeting the molding requirements for complex shapes in crafts.

[0018] The aforementioned craft materials based on polyester biodegradable plastics, wherein the plasticizer is one or more of citrate plasticizers, epoxidized soybean oil, and tributyl acetylglucosyl citrate. By employing the above technical solution, bio-based plasticizers are used to improve the material's flexibility, avoiding the environmental hazards of traditional phthalate plasticizers, and meeting green process requirements.

[0019] In the aforementioned craft materials based on polyester biodegradable plastics, the compatibilizer is one or more of maleic anhydride-grafted polyolefins and acrylic acid-grafted polyolefins. Using this technical solution, the grafted compatibilizer improves the compatibility between polar natural fibers and non-polar resins, reduces interfacial defects, and enhances the strength and surface quality of the material.

[0020] The aforementioned craft materials based on polyester biodegradable plastics include, in which the antioxidant is one or more of hindered phenolic antioxidants and phosphite antioxidants; the light stabilizer is one or more of hindered amine light stabilizers and benzotriazole light stabilizers; and the antibacterial agent is one or more of nano-silver antibacterial agents and quaternary ammonium salt antibacterial agents. By employing the above technical solution, the composite antioxidant, light stabilizer, and antibacterial agent endow the material with aging resistance and antibacterial properties, extending the service life of crafts and expanding application scenarios.

[0021] In the aforementioned craft materials based on polyester biodegradable plastics, the coupling agent is a silane coupling agent or a titanate coupling agent. Using this technical solution, the coupling agent treatment enhances the chemical bonding between the fiber and the resin matrix, improves stress transfer efficiency, removes impurities from the fiber surface, and improves the overall performance of the material.

[0022] This invention also provides a method for preparing craft materials based on polyester biodegradable plastics, comprising the following steps:

[0023] (a) Pretreatment of natural fibers: Natural plant fiber reinforcing agents with a length of 0.5-5 mm and a diameter of 5-50 μm are soaked in a coupling agent solution with a mass fraction of 3-8% for 1-3 hours, and then dried at 80-100℃ to constant weight;

[0024] (b) Premixing: Add the polyester biodegradable resin, plasticizer, compatibilizer, antioxidant, light stabilizer and antibacterial agent to a high-speed mixer and mix at 80-120℃ for 10-20 minutes to obtain the premix;

[0025] (c) Melt blending and granulation: The premix obtained in step (b) and the pretreated natural plant fiber reinforcing agent obtained in step (a) are added to a twin-screw extruder with an aspect ratio of 30-40. The mixture is melt blended at a melting temperature of 160-200°C and a screw speed of 200-400 r / min. The mixture is then extruded and granulated to obtain the composite material granules.

[0026] The combination of pretreatment, premixing temperature and time, melt blending temperature, screw speed and aspect ratio works synergistically to ensure good dispersion and interfacial bonding of the natural plant fibers in the matrix, making the resulting granules suitable for the manufacture of handicrafts.

[0027] By adopting the above technical solution, through the coordinated control of a specific aspect ratio, temperature and screw speed, the fiber is ensured to be uniformly dispersed in the matrix and retain an appropriate length, thereby optimizing the reinforcement effect and processing performance.

[0028] In the above-described method for preparing craft materials based on polyester biodegradable plastics, the coupling agent is a silane coupling agent or a titanate coupling agent. Using this technical solution, the silane or titanate coupling agent specifically improves the interfacial bonding between different fibers and resins, thereby enhancing the mechanical properties and environmental resistance of the material.

[0029] The above-mentioned method for preparing craft materials based on polyester biodegradable plastics includes a secondary crystallization treatment of the extruded granules in step (c). Specifically, the granules are placed in an environment at 60-80℃ for 2-4 hours and then slowly cooled to room temperature to improve the crystallinity and dimensional stability of the material. By employing this technical solution, the crystallinity and crystalline structure of the material can be adjusted through a controllable crystallization process, thereby improving dimensional stability and resistance to deformation, making it particularly suitable for high-precision craft manufacturing.

[0030] The above-mentioned application of polyester-based biodegradable plastic materials in the preparation of handicrafts includes, but is not limited to, sculptures, ornaments, decorations, and toys. By employing the above technical solutions, the combination of material properties and preparation processes makes the products suitable for various handicraft molding processes, promoting the application of biodegradable materials in the cultural and creative industries and reducing the environmental impact of traditional plastics.

[0031] The present invention has the following beneficial effects:

[0032] 1. Environmental characteristics: Made of polyester biodegradable resin and natural plant fiber, it meets environmental protection requirements and reduces the pollution of the environment caused by traditional plastics.

[0033] 2. Improved mechanical properties: Through pretreatment with natural plant fiber reinforcing agents and specific process parameters, the mechanical strength, surface smoothness, and dimensional stability of the material are improved.

[0034] 3. Processing adaptability: Optimized formula and process parameters make the material suitable for the manufacture of handicrafts, meeting the requirements of complex shapes and high precision.

[0035] 4. Multifunctionality: The addition of antioxidants, light stabilizers and antibacterial agents gives the material anti-aging and antibacterial properties, extending the service life of handicrafts.

[0036] 5. Synergistic effect: The synergistic effect of pretreatment, premixing conditions, melt blending parameters and secondary crystallization treatment ensures good dispersion and interfacial bonding of natural plant fibers in the matrix, thereby improving overall performance. Attached Figure Description

[0037] Figure 1 A flowchart illustrating a method for preparing craft materials based on polyester biodegradable plastics, as provided in an embodiment of the present invention.

[0038] Figure 2 This is a graph showing the effect of the content of natural plant fiber reinforcing agent on the mechanical strength of the material in an embodiment of the present invention.

[0039] Figure 3 This is a graph showing the effect of melt blending temperature on the material degradation rate in an embodiment of the present invention;

[0040] Figure 4 This diagram illustrates the effect of different types of natural plant fiber reinforcing agents on the antibacterial properties of the materials in this invention. Detailed Implementation

[0041] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0042] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual images. They should not be construed as limiting the scope of this patent. To better illustrate the embodiments of the present invention, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0043] In the accompanying drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components. In the description of the present invention, it should be understood that if terms such as "upper," "lower," "left," "right," "inner," and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting the present patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0044] In the description of this invention, unless otherwise explicitly specified and limited, the term "connection" or similar designation indicating a connection between components should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0045] Reference Figure 1-4 ,in, Figure 1 The process of preparing craft materials based on polyester biodegradable plastics is demonstrated; Figure 2 The results show that as the content of natural plant fiber reinforcing agent increases, the tensile strength and elongation at break of the material first increase and then tend to stabilize. An appropriate amount of fiber reinforcing agent can effectively improve the mechanical properties of the material, but excessive addition may lead to uneven fiber dispersion, thus having a negative impact on the performance. Figure 3The study demonstrated that the melt blending temperature has a significant impact on the degradation rate of the material. As the melt blending temperature increases, the crystallinity of the material increases, thereby reducing the degradation rate. A higher crystallization temperature is conducive to the formation of a regular crystal structure, making the material more resistant to degradation. Figure 4 This study demonstrates the varying effects of different types of natural plant fiber reinforcing agents on the antibacterial properties of materials. Bamboo fiber, due to its natural antibacterial components, exhibits the best antibacterial performance. Hemp fiber, wood fiber, and coconut fiber also possess some antibacterial effects, but these are relatively weak. The following three examples are provided in this specific embodiment:

[0046] Example 1: High-toughness craft materials

[0047] Formula (parts by weight):

[0048] 40 parts polylactic acid (PLA) + 40 parts polybutylene terephthalate (PBAT);

[0049] 10 parts of acetylacetonate tributyl citrate;

[0050] 15 parts of bamboo fiber (1-3 mm in length, 10-30 μm in diameter);

[0051] 5 parts of maleic anhydride-grafted polypropylene;

[0052] One part hindered phenolic antioxidant;

[0053] One part of hindered amine light stabilizer;

[0054] 0.5 parts of nano silver antibacterial agent.

[0055] Preparation process:

[0056] 1. Bamboo fiber is soaked in a 5wt% silane coupling agent (KH550) solution for 2 hours and dried at 90℃ to constant weight;

[0057] 2. Premixing conditions: 100℃, high-speed mixing for 15 minutes;

[0058] 3. Twin-screw extruder parameters: length-to-diameter ratio 35, melt temperature 180℃, screw speed 300r / min;

[0059] 4. Secondary crystallization treatment: Keep at 70℃ for 3 hours, then slowly cool to room temperature.

[0060] Experimental verification data:

[0061] 1. Mechanical properties: Tested by a universal testing machine, the elongation at break reaches 280%, which is about 50% higher than that of similar materials without optimized formulation. This indicates that the material can produce large deformation without breaking when subjected to tension, making it very suitable for manufacturing handicrafts with high elasticity requirements, such as flexible decorative ornaments.

[0062] 2. Surface quality: The surface finish is Ra0.8μm, as measured by a surface roughness tester. In practical applications, such a surface finish means that the finished product does not require complex surface treatment processes such as secondary polishing after molding, and can meet high appearance requirements.

[0063] 3. Degradation performance: According to the standard soil burial degradation test method, the soil degradation rate reached 25% within a 90-day test period. This data meets the relevant standards for biodegradable materials, indicating that the material can gradually decompose in the natural environment, reducing its long-term environmental impact.

[0064] Technical effects:

[0065] With a 50% increase in elongation at break, it is suitable for manufacturing handicrafts with high elasticity requirements; the surface finish reaches Ra0.8μm, eliminating the need for secondary polishing; and the soil degradation rate reaches 25% in 90 days, meeting the standards for biodegradable materials.

[0066] Example 2: High-strength structural handicrafts

[0067] Formula (parts by weight):

[0068] 60 parts of polyhydroxyalkanoate (PHA) + 20 parts of polybutylene succinate (PBS);

[0069] 8 parts of epoxidized soybean oil;

[0070] 20 parts of hemp fiber (2-5 mm in length, 15-40 μm in diameter);

[0071] Six parts of acrylic acid grafted with polyethylene;

[0072] 1.5 parts of phosphite antioxidants;

[0073] 1.5 parts of benzotriazole light stabilizer;

[0074] 0.3 parts of quaternary ammonium salt antibacterial agent;

[0075] Preparation process:

[0076] 1. Hemp fibers are soaked in a 6wt% titanate coupling agent (NDZ-201) solution for 2.5 hours and then dried at 85℃;

[0077] 2. Premixing conditions: 110℃, high-speed mixing for 18 minutes;

[0078] 3. Twin-screw extruder parameters: length-to-diameter ratio 38, melt temperature 190℃, screw speed 280r / min;

[0079] 4. Secondary crystallization treatment: Keep at 75℃ for 3.5 hours, then cool slowly.

[0080] Experimental verification data:

[0081] 1. Mechanical Properties: Tested tensile strength reaches 45 MPa, and flexural strength reaches 60 MPa. Such high strength allows the material to withstand significant external forces, making it suitable for manufacturing handicrafts with certain structural strength requirements, such as sculptures with complex supporting structures.

[0082] 2. Thermal Properties: Using heat distortion temperature testing equipment, the heat distortion temperature was measured to be 75℃. This means that the material can maintain good shape stability even at higher temperatures and will not easily deform, thus broadening its application range in different usage environments.

[0083] 3. Antibacterial properties: Antibacterial tests show an antibacterial rate of over 99% against both Escherichia coli and Staphylococcus aureus. This excellent antibacterial property effectively prevents bacterial growth on the surface of handicrafts, maintaining their cleanliness and hygiene. It is particularly suitable for handicrafts that come into close contact with the human body or require high hygiene standards.

[0084] Technical effects:

[0085] It has a tensile strength of 45MPa and a flexural strength of 60MPa; its heat distortion temperature is increased to 75℃, making it suitable for use in high-temperature environments; and its antibacterial rate against Escherichia coli and Staphylococcus aureus is >99%.

[0086] Example 3: Rapid prototyping decorative materials

[0087] Formula (parts by weight):

[0088] 50 parts polylactic acid (PLA) + 30 parts polybutylene succinate (PBS);

[0089] 12 parts of triethyl citrate;

[0090] 12 parts of wood fiber (0.5-2 mm in length, 5-20 μm in diameter);

[0091] Four parts of maleic anhydride-grafted ethylene-vinyl acetate copolymer;

[0092] 1.2 parts of compound antioxidant (hindered phenol + phosphite);

[0093] 1.2 parts of a composite light stabilizer (hindered amine + benzotriazole);

[0094] 0.8 parts of nano-silver antibacterial agent.

[0095] Preparation process:

[0096] 1. Wood fibers are soaked in a 4wt% silane coupling agent (KH560) solution for 1.5 hours and then dried at 95℃;

[0097] 2. Premixing conditions: 90℃, high-speed mixing for 12 minutes;

[0098] 3. Twin-screw extruder parameters: length-to-diameter ratio 32, melt temperature 170℃, screw speed 350r / min;

[0099] 4. Secondary crystallization treatment: Keep warm at 65℃ for 2.5 hours, then quickly air-cool.

[0100] Experimental verification data:

[0101] 1. Processing performance: Detected using a melt flow rate meter, the melt flow rate increased by 40%. This data directly reflects the material's better fluidity during processing. In processes such as injection molding, it can fill the mold cavity more quickly and smoothly, thereby shortening the injection cycle by 20%, greatly improving production efficiency, reducing production costs, and making it very suitable for large-scale production of decorative handicrafts.

[0102] 2. Surface Properties: Using hardness testing equipment, the surface hardness reached HB level. This level of hardness gives the material surface a certain degree of wear resistance, which can effectively maintain the clarity and integrity of the surface pattern for handicrafts such as relief decorative pieces that are easily subjected to friction, thus extending the service life of the handicrafts.

[0103] 3. Weather resistance: After a 500-hour weather resistance test (such as a xenon lamp aging test), the color difference ΔE < 3. This indicates that the material maintains excellent color retention after being exposed to environmental factors such as light and temperature changes for a long time, without significant fading, and can always maintain the beauty of the handicraft.

[0104] Technical effects:

[0105] The melt flow rate is increased by 40%, and the injection molding cycle is shortened by 20%; the surface hardness reaches HB level, making it suitable for relief-type decorative parts; the color difference ΔE < 3 after 500 hours of weather resistance testing, indicating excellent color retention.

[0106] Comparison table of process parameters

[0107] parameter Example 1 (Tough Type) Example 2 (High Strength) Example 3 (Rapid Prototyping) Coupling agent type Silane KH550 Titanate NDZ-201 Silane KH560 Premixed temperature 100℃ 110℃ 90℃ Screw speed 300r / min 280r / min 350r / min Crystallization treatment temperature 70℃ 75℃ 65℃ Key performance advantages High elongation at break High tensile strength Rapid processing adaptability

[0108] The above embodiments demonstrate that by adjusting the formula and process parameters, the material properties can be customized to meet the needs of different crafts, reflecting the flexibility and practicality of the present invention.

[0109] The interfacial bonding strength (σ_interface) between the natural plant fiber reinforcing agent and the polyester matrix satisfies the following equation:

[0110]

[0111] in:

[0112] k is the coupling agent treatment efficiency coefficient (range 0.8-1.2), which is positively correlated with the coupling agent concentration and pretreatment time;

[0113] E f The elastic modulus (GPa) of natural plant fibers;

[0114] E m The elastic modulus (GPa) of the polyester matrix;

[0115] C is the compatibility coefficient between the fiber and the matrix (ranging from 0.5 to 1.5), which is determined by the type and amount of compatibilizer.

[0116] L represents the fiber length (mm), with a value ranging from 0.5 to 5.

[0117] D is the fiber diameter (μm), with a value ranging from 5 to 50.

[0118] Example: If bamboo fiber (E) is selected f =30GPa), PLA matrix (E m =3 GPa), treated with a silane coupling agent (k = 1.1), with maleic anhydride-grafted polyolefin as the compatibilizer (C = 1.2), fiber length L = 3 mm, diameter D = 20 μm, then:

[0119]

[0120] This value is higher than that of the unoptimized interface (typically <5 MPa), indicating that the material has higher mechanical strength.

[0121] Technical effects: This equation combines fiber geometry (L / D), coupling agent efficiency (k), and compatibility (C) into a unified equation, quantifying interfacial strength; by adjusting the equation parameters (such as increasing C or k), it can directly guide process optimization (such as extending the coupling agent soaking time or changing the compatibility agent); the equation works synergistically with the process conditions in this embodiment (such as the length-to-diameter ratio of the twin-screw extruder and temperature) to ensure fiber dispersion and interfacial bonding.

[0122] The working principle of this equation is as follows:

[0123] 1. Pretreatment stage: Coupling agent treatment increases the k-value, and fiber drying reduces moisture interference;

[0124] 2. Melt blending stage: High temperature (160-200℃) and high shear (screw speed 200-400r / min) promote the maximization of C value;

[0125] 3. Performance Output: σ calculated by the equation interface The error between the value and the actual test result is less than 10%, which verifies the effectiveness of the process.

[0126] In summary, the working principle of the craft material based on polyester biodegradable plastics provided in this embodiment is as follows:

[0127] 1. Coupling agent pretreatment: Silane or titanate coupling agents form chemical bonds on the surface of natural plant fibers, enhancing the interfacial bonding between the fibers and polyester biodegradable resins and improving stress transfer efficiency.

[0128] 2. Melt blending optimization: A twin-screw extruder with an aspect ratio of 30-40 provides sufficient shear force and residence time to ensure that the fibers are uniformly dispersed in the resin matrix while avoiding excessive fiber breakage.

[0129] 3. Secondary crystallization treatment: By controlling the temperature and time, the material is induced to form a more stable crystalline structure, improving crystallinity and dimensional stability, and reducing deformation of the product during use.

[0130] How to use

[0131] 1. Material preparation: Weigh each component according to the formula, and perform natural fiber pretreatment, premixing, melt blending and granulation in sequence. If necessary, perform secondary crystallization treatment.

[0132] 2. Craft molding: The prepared granules are molded into the desired crafts using conventional plastic processing methods such as injection molding, extrusion, and compression molding.

[0133] 3. Post-processing: Surface treatment, coating and other post-processing steps are carried out on the molded handicrafts as needed.

[0134] The above are merely preferred embodiments of the present invention and are not intended to limit the implementation methods and protection scope of the present invention. Those skilled in the art should recognize that any equivalent substitutions and obvious changes made based on the description and illustrations of the present invention should be included within the protection scope of the present invention.

Claims

1. A craft material based on polyester biodegradable plastic, characterized in that, By weight, it consists of the following components: 50-80 parts of biodegradable polyester resin; Plasticizer 5-15 parts; 10-25 parts of natural plant fiber reinforcing agent with a length of 0.5-5mm and a diameter of 5-50μm; 3-8 parts compatibilizer; Antioxidant 0.5-2 parts; Light stabilizer 0.5-2 parts; Antibacterial agent 0.1-1 part; The natural plant fiber reinforcing agent is selected from one or more of bamboo fiber, hemp fiber, wood fiber, and coconut fiber. The natural plant fiber reinforcing agent is pretreated by soaking in a 3-8 wt% coupling agent solution for 1-3 hours before being added, and then dried at 80-100℃ to constant weight. The composite material is prepared in a twin-screw extruder with an aspect ratio of 30-40, a melt blending temperature of 160-200℃, and a screw speed of 200-400 r / min to obtain granules with good surface finish, mechanical strength, and dimensional stability suitable for the manufacture of handicrafts.

2. The craft material based on polyester biodegradable plastic according to claim 1, characterized in that, The polyester biodegradable resin is one or a mixture of polylactic acid (PLA), polyhydroxyalkanoate (PHA), polybutylene succinate (PBS), and polybutylene terephthalate (PBAT).

3. The craft material based on polyester biodegradable plastic according to claim 1, characterized in that, The plasticizer is one or more of the following: citrate plasticizers, epoxidized soybean oil, and tributyl acetylglucosyl citrate.

4. The craft material based on polyester biodegradable plastic according to claim 1, characterized in that, The compatibilizer is one or more of maleic anhydride-grafted polyolefin and acrylic acid-grafted polyolefin.

5. The craft material based on polyester biodegradable plastic according to claim 1, characterized in that, The antioxidant is one or more of hindered phenolic antioxidants and phosphite antioxidants; the light stabilizer is one or more of hindered amine light stabilizers and benzotriazole light stabilizers; and the antibacterial agent is one or more of nano-silver antibacterial agents and quaternary ammonium salt antibacterial agents.

6. The craft material based on polyester biodegradable plastic according to claim 1, characterized in that, The coupling agent is a silane coupling agent or a titanate coupling agent.

7. A method for preparing a craft material based on polyester biodegradable plastic according to any one of claims 1-6, characterized in that, Includes the following steps: (a) Pretreatment of natural fibers: Natural plant fiber reinforcing agents with a length of 0.5-5 mm and a diameter of 5-50 μm are soaked in a coupling agent solution with a mass fraction of 3-8% for 1-3 hours, and then dried at 80-100℃ to constant weight; (b) Premixing: Add the polyester biodegradable resin, plasticizer, compatibilizer, antioxidant, light stabilizer and antibacterial agent to a high-speed mixer and mix at 80-120℃ for 10-20 minutes to obtain the premix; (c) Melt blending and granulation: The premix obtained in step (b) and the pretreated natural plant fiber reinforcing agent obtained in step (a) are added to a twin-screw extruder with an aspect ratio of 30-40. The mixture is melt blended at a melting temperature of 160-200°C and a screw speed of 200-400 r / min. The mixture is then extruded and granulated to obtain the composite material granules. The combination of pretreatment, premixing temperature and time, melt blending temperature, screw speed and aspect ratio works synergistically to ensure good dispersion and interfacial bonding of the natural plant fibers in the matrix, making the resulting granules suitable for the manufacture of handicrafts.

8. The method for preparing craft materials based on polyester biodegradable plastics according to claim 7, characterized in that, The coupling agent is a silane coupling agent or a titanate coupling agent.

9. The method for preparing craft materials based on polyester biodegradable plastics according to claim 7, characterized in that, In step (c), the extruded granules undergo a secondary crystallization process, specifically by placing the granules in an environment at 60-80°C for 2-4 hours and then slowly cooling them to room temperature to improve the crystallinity and dimensional stability of the material.

10. The application of the craft material based on polyester biodegradable plastic according to any one of claims 1-6 in the preparation of crafts, wherein the crafts include, but are not limited to, sculptures, ornaments, decorations, and toys.

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