A renewable degradable composite polyester fiber containing a plant reinforcing material and a method for preparing the same

Abstract

The application provides a renewable degradable composite polyester fiber containing plant reinforcing material and a preparation method thereof, and the renewable degradable composite polyester fiber contains the following raw materials in parts by weight: plant reinforcing material 40-50 parts, inorganic composite powder 0.5-1.5 parts, and polyester chip 100-140 parts. The multi-functional group polar extract contained in the renewable degradable composite polyester fiber prepared by modifying the polyester chip with the plant reinforcing material can attract Ideonella sakaiensis bacteria in the soil or waste water more, the polyester fiber is degraded into small molecules and finally absorbed by the Ideonella sakaiensis bacteria. The inorganic composite powder is added in the melt spinning process, and cooperates with the modified polyester chip, so that the specific surface area of the polyester fiber is increased, the microorganisms in the polyester fiber inside and on the surface jointly act in the degradation process, and the renewable degradation capacity of the polyester fiber and fabric is improved. Through detection, the relative biodegradation rate of the renewable degradable composite polyester fiber prepared by the application reaches 95% in 180 days.

Description

Technical Field

[0001] This invention belongs to the field of fiber technology, specifically relating to a renewable and degradable composite polyester fiber containing plant-based reinforcing materials and its preparation method. Background Technology

[0002] Fibers are broadly classified into natural fibers and synthetic fibers. Synthetic fibers, with their superior abrasion resistance, crisp fabric texture, and resistance to deformation, are widely used in various aspects of daily life. Synthetic fibers are made from synthetic polymer compounds. Commonly used synthetic fibers include polyester and nylon. Polyester, due to its readily available raw materials, excellent performance, wide range of applications, and rapid development, has become the leading chemical fiber in terms of production volume. However, polyester faces a major problem—its non-degradability. To reduce the environmental impact of polyester, extensive research has been conducted on its degradation processes. Based on ester hydrolysis and alcoholysis, polyester is degraded and recycled. For example, under certain temperature and pressure conditions, water, acid, and alkali reagents are used to break down the large molecular chains of polyester, achieving degradation. However, existing technologies for polyester degradation suffer from drawbacks such as high cost, complex processes, and reagent pollution.

[0003] The patent number "CN202110250290.5" entitled "A Chemical Pretreatment Method for Improving the Enzymatic Degradation Efficiency of Waste Polyester Fabric" provides a method for degrading polyester using enzymatic hydrolysis. The recrystallized polyester is added to an enzyme catalytic system containing polyester degrading enzyme LCC for degradation, so that the enzyme degradation rate of the originally non-biodegradable polyester reaches 56%. However, this method requires further processing of the polyester, while in real life most polyester is directly discarded, causing environmental pollution.

[0004] As people's living standards improve and their attitudes change, their awareness of health care is gradually increasing, and functional fibers are becoming more popular. Plant-derived materials are inexpensive, safe, and environmentally friendly, which has led to a large number of companies adding plant extracts to fibers to give them natural functionality. Summary of the Invention

[0005] To address the problems existing in the prior art, this invention provides a renewable and biodegradable composite polyester fiber containing plant-based reinforcing materials and its preparation method, achieving the following objectives:

[0006] 1. By using graft copolymerization, plant-based reinforcing materials containing both rigid and flexible blocks are introduced into the polyester macromolecular chain, which not only endows polyester fibers with long-lasting antibacterial and anti-mite functions, but also improves the recyclability and biodegradability of polyester fibers.

[0007] 2. The presence of flexible blocks in the polymer matrix enhances the effect of inorganic composite powder addition on the strength of polyester fibers, making the internal stress of polyester fibers more uniform; the addition of inorganic composite powder increases the contact area between polyester fibers and microorganisms during degradation, thereby improving the regenerative degradation capability of polyester fibers and their fabrics.

[0008] To solve the above technical problems, the present invention adopts the following technical solution:

[0009] One of the objectives of this invention is to provide a renewable and degradable composite polyester fiber containing plant-based reinforcing materials. The renewable and degradable composite polyester fiber comprises, by weight, the following raw materials: 40-50 parts of plant-based reinforcing materials, 0.5-1.5 parts of inorganic composite powder, and 100-140 parts of polyester chips.

[0010] As a preferred technical solution of the present invention, the plant-reinforcing material, by weight, comprises the following components: 20-30 parts of multifunctional polar extract and 80-110 parts of reinforcing polymer matrix.

[0011] As a preferred embodiment of the present invention, the functionality of the multifunctional polar extract is 3-15.

[0012] As a preferred technical solution of the present invention, the multifunctional polar extract is selected from one or more combinations of catechin, hydroxyasiatic acid, 6-gingerol, agrimonol B, rosmarinic acid, oridonin A, and hesperidin.

[0013] As a more preferred technical solution of the present invention, the multifunctional polar extract is catechin, 6-gingerol, rosmarinic acid, and hesperidin; the mass ratio of catechin, 6-gingerol, rosmarinic acid, and hesperidin is (2-4):(1-3):(0.5-1.5):(1.5-2.5).

[0014] As a preferred embodiment of the present invention, the mass ratio of catechin, 6-gingerol, rosmarinic acid, and hesperidin is 3:2.5:1:2.

[0015] When polyester fibers are directly discarded, the multifunctional polar extract can attract Ideonella sakaiensis bacteria in soil or wastewater. These bacteria secrete IsPETase enzyme, which can degrade polyester fibers into small molecules, which are eventually absorbed by Ideonella sakaiensis bacteria, thus completing the degradation of polyester fibers.

[0016] As a preferred embodiment of the present invention, the reinforcing polymer matrix is ​​selected from one or more combinations of polyethylene glycol, polyacrylamide, polypropylene, ε-caprolactone, and polyvinylpyrrolidone.

[0017] As a more preferred technical solution of the present invention, the reinforcing polymer matrix is ​​polyethylene glycol or caprolactone.

[0018] As a preferred embodiment of the present invention, the method for preparing the plant-enhancing material includes the following steps:

[0019] S1: Weigh out the multifunctional polar extract according to the proportion, place it in a vacuum drying oven, dry it at 55-65℃ for 3-4 hours, then add it to the reactor, replace it with nitrogen 3 times, and set it aside.

[0020] S2: Under nitrogen protection, polyethylene glycol, caprolactone, and toluene solution containing a metal catalyst are added sequentially to a reactor containing a multifunctional polar extract. The temperature is gradually raised to 120-140℃, and the reaction is carried out for 6-16 hours. After cooling to room temperature, the mixture is filtered, and the filter residue is fully dissolved in dichloromethane and precipitated with diethyl ether. This process is repeated 2-4 times. The mixture is then filtered under vacuum and dried at 25-35℃ for 24-72 hours to obtain the plant-reinforced material.

[0021] As a preferred embodiment of the present invention, the mass ratio of caprolactone and polyethylene glycol in S2 is 1:(3-5), and the concentration of the toluene solution containing the metal catalyst is 0.1-0.2 g / mL.

[0022] As a preferred embodiment of the present invention, the polyethylene glycol in S2 has a hydroxyl value of 17.5-20 mgKOH / g and an average molecular weight of 5500-7000.

[0023] As a preferred embodiment of the present invention, the metal catalyst in S2 is stannous octoate.

[0024] As a preferred technical solution of the present invention, the heating rate in S2 is 2-4℃ / min.

[0025] As a preferred technical solution of the present invention, the inorganic composite powder is selected from one or more combinations of kaolin, silicon dioxide, hydrotalcite, maifanite, and ceramic powder.

[0026] A second objective of this invention is to provide a method for preparing a renewable and biodegradable composite polyester fiber containing plant-based reinforcing materials, the method comprising the following steps:

[0027] The plant-reinforcing material and polyester chips are dried and kept at 60-120℃, with the temperature kept at 60-80℃ for 6-8 hours and at 80-120℃ for 2-4 hours. The plant-reinforcing material and polyester chips after the temperature is kept at 60-80℃ are then blended and extruded to obtain modified polyester chips. The modified polyester chips and inorganic composite powder are then added together to a screw extruder for melt spinning to obtain the renewable and degradable composite polyester fiber containing the plant-reinforcing material.

[0028] As a preferred technical solution of the present invention, the spinning process involves a pre-spinning pressure of 12-15 MPa, a spinning pressure of 60-75 MPa, and a spinning speed of 800-1200 m / min.

[0029] By adopting the above technical solution, the technical effect achieved by this invention is as follows:

[0030] 1. This invention uses caprolactone and polyethylene glycol to prepare a reinforcing polymer matrix, and introduces catechin, 6-gingerol, rosmarinic acid, and hesperidin into polyethylene glycol and caprolactone. The resulting plant-reinforcing material is prepared under the catalysis of a metal catalyst. The plant-reinforcing material is used to modify polyester chips, expanding the molecular weight distribution width of the polyester macromolecular chains. While ensuring the antibacterial and anti-mite functions of the polyester fiber, it lays the foundation for the uniform dispersion of subsequent inorganic composite powders, solving the problem of reduced strength and poor spinnability of polyester fibers caused by inorganic and polymer matrices.

[0031] 2. Testing showed that the recyclable and biodegradable composite polyester fiber prepared by this invention exhibited an antibacterial rate of over 97% against Staphylococcus aureus, Escherichia coli, and Candida albicans after 50 washes, meeting the AAA grade requirements of FZ / T 73203-2006 "Antibacterial Knitted Fabrics"; the mite repellency rate was over 99% (GB / T 24253-2009); the strength was 4.5-6.0 cN / dtex; and the moisture regain was 1.2-1.8%.

[0032] 3. By modifying polyester chips with plant-based reinforcing materials, when the polyester fibers prepared in this invention are directly discarded, the multifunctional polar extracts contained in the polyester fibers can attract Ideonella sakaiensis bacteria in the soil or wastewater. These bacteria can secrete IsPETase enzyme, which can degrade the polyester fibers into small molecules, which are eventually absorbed by Ideonella sakaiensis bacteria. The modification of polyester chips by plant-based reinforcing materials expands the molecular weight distribution width of the polyester macromolecular chain, thereby accelerating the degradation of the polyester fibers. At the same time, the flexible blocks in polyethylene glycol and caprolactone avoid the impact of the expanded molecular weight distribution width of the polyester macromolecular chain on the mechanical properties of the polyester fibers.

[0033] 4. Inorganic composite powder is added during the melt spinning process. Through specific melt spinning technology, inorganic powder is introduced into the polyester fiber. This powder, working synergistically with the modified polyester chips, increases the specific surface area of ​​the polyester fiber. This improves the hygroscopicity and softness of the polyester fiber and its fabric, while simultaneously enabling microorganisms to work both inside and on the surface of the polyester fiber during degradation, thus enhancing the regenerative degradation capacity of the polyester fiber and its fabric. Testing shows that the regenerative degradable composite polyester fiber prepared by this invention achieves a relative biodegradability of 95% (GB T19277.1-2011) after 180 days, far exceeding the degradation performance of ordinary polyester fibers, demonstrating excellent regenerative degradation capability.

[0034] 5. The reinforced polymer matrix is ​​prepared using caprolactone and polyethylene glycol. The presence of flexible blocks in caprolactone and polyethylene glycol improves the effect of the addition of inorganic composite powder on the strength of polyester fibers and ensures the spinnability of polyester fibers. Detailed Implementation

[0035] The present invention will be further illustrated below with reference to specific embodiments.

[0036] Example 1: A renewable and biodegradable composite polyester fiber containing plant-based reinforcing materials and its preparation method, comprising the following steps:

[0037] S1: Weigh out the multifunctional polar extract according to the proportion, place it in a vacuum drying oven, dry it at 60°C for 4 hours, add it to the reactor, replace the nitrogen gas 3 times, and set it aside.

[0038] The multifunctional polar extract comprises catechin, 6-gingerol, rosmarinic acid, and hesperidin; the mass ratio of catechin, 6-gingerol, rosmarinic acid, and hesperidin is 3:2.5:1:2.

[0039] S2: Under nitrogen protection, a reinforcing polymer matrix and a toluene solution containing stannous octoate were added sequentially to a reactor containing a multifunctional polar extract. The temperature was gradually raised to 130°C and reacted for 12 hours. The mixture was then cooled to room temperature, filtered, and the residue was fully dissolved in dichloromethane and precipitated with ether. This process was repeated four times. The mixture was then filtered and dried under vacuum at 30°C for 72 hours to obtain the plant-reinforcing material.

[0040] The reinforcing polymer matrix is ​​caprolactone and polyethylene glycol, the mass ratio of caprolactone to polyethylene glycol is 1:4, and the concentration of the toluene solution containing stannous octoate is 0.2 g / mL;

[0041] The polyethylene glycol has a hydroxyl value of 20 mg KOH / g and an average molecular weight of 6000; the heating rate is 2 °C / min.

[0042] The amount of the multifunctional polar extract and the reinforcing polymer matrix added, by weight, is 24 parts of the multifunctional polar extract and 80 parts of the reinforcing polymer matrix.

[0043] S3: The plant-reinforcing material and polyester chips are dried and kept at 70°C for 7 hours and 100°C for 4 hours. The plant-reinforcing material and polyester chips after being kept at 70°C are blended and extruded to obtain modified polyester chips. The modified polyester chips and inorganic composite powder are added together to a screw extruder for melt spinning to obtain the renewable and degradable composite polyester fiber containing plant-reinforcing material.

[0044] The amounts of plant-based reinforcing material, inorganic composite powder, and polyester chips added, by weight, are 47 parts of plant-based reinforcing material, 1 part of inorganic composite powder, and 110 parts of polyester chips.

[0045] The inorganic composite powder is silicon dioxide with a mesh size of 1250 mesh.

[0046] The spinning process involves a pre-spinning pressure of 14 MPa, a spinning pressure of 70 MPa, and a spinning speed of 1000 m / min.

[0047] The regenerable biodegradable composite polyester fiber prepared in Example 1 showed an inhibition rate of 99.5% against Staphylococcus aureus, 98.3% against Escherichia coli, and 97.9% against Candida albicans after 50 washes. It also exhibited a mite repellency rate of 99.7%, a strength of 6.0 cN / dtex, a moisture regain of 1.8%, and a relative biodegradability of 95% after 180 days.

[0048] Example 2: A renewable and biodegradable composite polyester fiber containing plant-based reinforcing materials and its preparation method, comprising the following steps:

[0049] S1: Weigh out the multifunctional polar extract according to the proportion, place it in a vacuum drying oven, dry it at 55°C for 4 hours, then add it to the reactor, replace it with nitrogen three times, and set it aside.

[0050] The multifunctional polar extract comprises catechin, 6-gingerol, rosmarinic acid, and hesperidin; the mass ratio of catechin, 6-gingerol, rosmarinic acid, and hesperidin is 2:1:0.5:1.5.

[0051] S2: Under nitrogen protection, a reinforcing polymer matrix and a toluene solution containing stannous octoate are added sequentially to a reactor containing a multifunctional polar extract. The temperature is gradually raised to 120°C, and after reacting for 6 hours, the mixture is cooled to room temperature, filtered, and the filter residue is fully dissolved in dichloromethane and precipitated with diethyl ether. This process is repeated twice. The mixture is then filtered under vacuum and dried at 25°C for 48 hours to obtain the plant-reinforcing material.

[0052] The reinforcing polymer matrix is ​​caprolactone and polyethylene glycol, with a mass ratio of caprolactone to polyethylene glycol of 1:3, and the concentration of the toluene solution containing stannous octoate is 0.1 g / mL.

[0053] The polyethylene glycol has a hydroxyl value of 17.5 mg KOH / g and an average molecular weight of 5500; the heating rate is 3 °C / min.

[0054] The amount of the multifunctional polar extract and the reinforcing polymer matrix added, by weight, is 20 parts of the multifunctional polar extract and 90 parts of the reinforcing polymer matrix.

[0055] S3: The plant-reinforcing material and polyester chips are dried and kept at 60°C for 8 hours and 80°C for 3 hours. The plant-reinforcing material and polyester chips after being kept at 60°C are blended and extruded to obtain modified polyester chips. The modified polyester chips and inorganic composite powder are added together to a screw extruder for melt spinning to obtain the renewable and degradable composite polyester fiber containing plant-reinforcing material.

[0056] The amounts of the plant-based reinforcing material, inorganic composite powder, and polyester chips added, by weight, are 40 parts of plant-based reinforcing material, 0.5 parts of inorganic composite powder, and 100 parts of polyester chips.

[0057] The inorganic composite powder is kaolin with a mesh size of 1250.

[0058] The spinning process involves a pre-spinning pressure of 12 MPa, a spinning pressure of 60 MPa, and a spinning speed of 800 m / min.

[0059] The recyclable and biodegradable composite polyester fiber prepared in Example 2 showed an inhibition rate of 99% against Staphylococcus aureus, 97.6% against Escherichia coli, and 97.2% against Candida albicans after 50 washes. It also exhibited a mite repellency rate of 99.1%, a strength of 5.2 cN / dtex, a moisture regain of 1.2%, and a relative biodegradability of 92% after 180 days.

[0060] Example 3: A renewable and biodegradable composite polyester fiber containing plant-based reinforcing materials and its preparation method, comprising the following steps:

[0061] S1: Weigh out the multifunctional polar extract according to the proportion, place it in a vacuum drying oven, dry it at 65°C for 3 hours, then add it to the reactor, replace the nitrogen gas 3 times, and set it aside.

[0062] The multifunctional polar extract comprises catechin, 6-gingerol, rosmarinic acid, and hesperidin; the mass ratio of catechin, 6-gingerol, rosmarinic acid, and hesperidin is 4:3:1.5:2.5.

[0063] S2: Under nitrogen protection, a reinforcing polymer matrix and a toluene solution containing stannous octoate are added sequentially to a reactor containing a multifunctional polar extract. The temperature is gradually raised to 140°C, and after reacting for 16 hours, the mixture is cooled to room temperature, filtered, and the filter residue is fully dissolved in dichloromethane and precipitated with diethyl ether. This process is repeated three times. The mixture is then filtered under vacuum and dried at 35°C for 24 hours to obtain the plant-reinforcing material.

[0064] The reinforcing polymer matrix is ​​caprolactone and polyethylene glycol, with a mass ratio of caprolactone to polyethylene glycol of 1:5, and the concentration of the toluene solution containing stannous octoate is 0.2 g / mL.

[0065] The polyethylene glycol has a hydroxyl value of 19 mg KOH / g and an average molecular weight of 7000; the heating rate is 4 °C / min.

[0066] The amount of the multifunctional polar extract and the reinforcing polymer matrix added, by weight, is 30 parts of the multifunctional polar extract and 110 parts of the reinforcing polymer matrix.

[0067] S3: The plant-reinforcing material and polyester chips are dried and kept at 80°C for 6 hours and 120°C for 2 hours. The plant-reinforcing material and polyester chips after being kept at 80°C are blended and extruded to obtain modified polyester chips. The modified polyester chips and inorganic composite powder are added together to a screw extruder for melt spinning to obtain the renewable and degradable composite polyester fiber containing plant-reinforcing material.

[0068] The amounts of the plant-based reinforcing material, inorganic composite powder, and polyester chips added, by weight, are 50 parts of plant-based reinforcing material, 1.5 parts of inorganic composite powder, and 140 parts of polyester chips.

[0069] The inorganic composite powder is hydrotalcite with a mesh size of 1500 mesh.

[0070] The spinning process involves a pre-spinning pressure of 15 MPa, a spinning pressure of 75 MPa, and a spinning speed of 1200 m / min.

[0071] The recyclable and biodegradable composite polyester fiber prepared in Example 3 showed an inhibition rate of 99.3% against Staphylococcus aureus, 98% against Escherichia coli, and 97.6% against Candida albicans after 50 washes. It also exhibited a mite repellency rate of 99.5%, a strength of 4.5 cN / dtex, a moisture regain of 1.7%, and a relative biodegradability of 91% after 180 days.

[0072] Comparative Example 1

[0073] Example 1, a representative example, was selected. No inorganic composite powder was added during S3 melt spinning, while all other aspects remained the same as in Example 1, serving as Comparative Example 1. The polyester fiber obtained in Comparative Example 1, after 50 washes, exhibited an antibacterial rate of 99.4% against Staphylococcus aureus, 98.3% against Escherichia coli, and 97.9% against Candida albicans. It also showed a mite repellency rate of 99.6%, with essentially the same functionality. Its strength was 6.05 cN / dtex, and its moisture regain was 1.0%, indicating a decrease in hygroscopicity. The relative biodegradability after 180 days was 81%, showing a decline in degradation performance.

[0074] Comparative Example 1 illustrates that by adding inorganic composite powder during melt spinning, inorganic powder is introduced into polyester fibers through a specific melt spinning technology. Through synergistic action with modified polyester chips, the specific surface area of ​​polyester fibers is increased, enabling microorganisms to work together inside and on the surface of polyester fibers during degradation. This enhances the regenerative degradation capability of polyester fibers and their fabrics, while also improving the hygroscopicity of polyester fibers.

[0075] Comparative Example 2

[0076] Example 1, a representative example, was selected. Step S2 was omitted, and the plant-based reinforcing material was replaced with an equal amount of multifunctional polar extract as in Example 1. All other aspects remained the same as in Example 1, serving as Comparative Example 2. Due to the high melt spinning temperature, the multifunctional polar extract was partially deactivated. Therefore, the polyester fiber prepared in Comparative Example 2 showed a significantly reduced antibacterial and anti-mite function after 50 washes, with an inhibition rate of 68% against Staphylococcus aureus, 66% against Escherichia coli, and 62% against Candida albicans. The mite repellency rate was 71%. The strength was 2.8 cN / dtex, the moisture regain was 1.1%, and the relative biodegradability after 180 days was only 42%.

[0077] It can be seen that by preparing a reinforcing polymer matrix using caprolactone and polyethylene glycol, and introducing catechin, 6-gingerol, rosmarinic acid, and hesperidin into polyethylene glycol and caprolactone, and preparing plant-reinforcing materials under the catalysis of a metal catalyst, the problems of reduced strength and poor spinnability of polyester fibers caused by inorganic and polymeric matrices are not only solved, but also the multifunctional polar extracts are protected, the thermal stability of the multifunctional polar extracts is improved, and the functionality and recyclability of polyester fibers are guaranteed.

[0078] Comparative Example 3

[0079] Selecting a representative Example 1, step S2 was omitted. Unmodified polyester chips and inorganic composite powder were added together to a screw extruder for melt spinning to produce polyester fibers. Everything else was the same as in Example 1, serving as Comparative Example 3. Then, using a finishing method, an equal amount of multifunctional polar extract as in Example 1 was added to the polyester fibers prepared in Comparative Example 3. The properties were tested as follows: after 50 washes, the inhibition rate against Staphylococcus aureus was 92.3%, against Escherichia coli was 91.8%, against Candida albicans was 91.6%, the mite repellency rate was 93%, the strength was 3.5 cN / dtex, the moisture regain was 1.7%, and the relative biodegradability after 180 days was 84%.

[0080] Comparative Example 3 demonstrates that the preparation of plant-based reinforcing materials makes the antibacterial and anti-mite effects of polyester fibers more durable. Modifying polyester chips with plant-based reinforcing materials expands the molecular weight distribution width of the polyester macromolecular chains, accelerating the degradation of polyester fibers. Simultaneously, the flexible blocks in polyethylene glycol and caprolactone avoid the impact of expanding the molecular weight distribution width of the polyester macromolecular chains and the addition of inorganic composite powders on the mechanical properties of the polyester fibers. The mechanical properties of Comparative Example 3 are slightly higher than those of Comparative Example 2 because the multifunctional polar extract in Comparative Example 3 is added in a post-processing form, reducing its impact on the mechanical properties of the polyester fibers.

[0081] Unless otherwise specified, all proportions and percentages mentioned in this invention are mass proportions and mass percentages; all raw materials are commercially available.

[0082] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A renewable and biodegradable composite polyester fiber containing plant-reinforcing materials, characterized in that, The renewable and degradable composite polyester fiber comprises, by weight, the following raw materials: 40-50 parts of plant-based reinforcing material, 0.5-1.5 parts of inorganic powder, and 100-140 parts of polyester chips. The plant-reinforcing material, by weight, comprises the following components in its preparation: 20-30 parts of a multifunctional polar extract and 80-110 parts of a reinforcing polymer matrix. The multifunctional polar extract comprises catechin, 6-gingerol, rosmarinic acid, and hesperidin; the mass ratio of catechin, 6-gingerol, rosmarinic acid, and hesperidin is (2-4):(1-3):(0.5-1.5):(1.5-2.5). The preparation method of the plant-reinforcing material is as follows: S1: Weigh out the multifunctional polar extract according to the proportion, place it in a vacuum drying oven, dry it at 55-65℃ for 3-4 hours, then add it to the reactor, replace it with nitrogen 3 times, and set it aside. S2: Under nitrogen protection, caprolactone, polyethylene glycol, and toluene solution containing a metal catalyst are added sequentially to a reactor containing a multifunctional polar extract. The temperature is gradually raised to 120-140℃, and the reaction is carried out for 6-16 hours. After cooling to room temperature, the mixture is filtered, and the filter residue is fully dissolved in dichloromethane and precipitated with diethyl ether. This process is repeated 2-4 times. The mixture is then filtered under vacuum and dried at 25-35℃ for 24-72 hours to obtain the plant-reinforced material.

2. The renewable and biodegradable composite polyester fiber containing plant-reinforced materials according to claim 1, characterized in that, The mass ratio of caprolactone to polyethylene glycol is 1:(3-5); The concentration of the toluene solution containing the metal catalyst is 0.1-0.2 g / mL.

3. The renewable and biodegradable composite polyester fiber containing plant-reinforced materials according to claim 1, characterized in that, The inorganic powder is selected from one or more of the following: kaolin, silica, hydrotalcite, maifanite, and ceramic powder.

4. The renewable and biodegradable composite polyester fiber containing plant-reinforced materials according to claim 1, characterized in that, The method for preparing the regenerative and degradable composite polyester fiber containing plant reinforcement material is as follows: the plant reinforcement material and polyester chips are dried and kept at 60-120℃, wherein the temperature is kept at 60-80℃ for 6-8 hours and at 80-120℃ for 2-4 hours. The plant reinforcement material and polyester chips after the temperature is kept at 60-80℃ are blended and extruded to obtain modified polyester chips. The modified polyester chips and inorganic powder are added together to a screw extruder for melt spinning to obtain the regenerative and degradable composite polyester fiber containing plant reinforcement material.

5. The renewable and biodegradable composite polyester fiber containing plant-reinforced materials according to claim 4, characterized in that, The spinning process involves a pre-spinning pressure of 12-15 MPa, a spinning pressure of 60-75 MPa, and a spinning speed of 800-1200 m / min.