Degradable plastic woven bag and manufacturing method

Abstract

The invention discloses a degradable plastic woven bag and a manufacturing method, and relates to the technical field of environment-friendly materials, and the plastic woven bag comprises the following specific components: polylactic acid, polyethylene, a plasticizer, an antioxidant and an ultraviolet light absorber. The plastic woven bag further comprises additives, and the additives comprise polyhydroxyalkanoate, composite microalgae, nanoscale calcium oxide, modified lignin, bio-based fatty acid ester, calcium phosphate and plant amino acid. According to the degradable plastic woven bag and the manufacturing method, various additives such as the polylactic acid, the polyethylene, the plasticizer, the antioxidant, the ultraviolet light absorber and the composite microalgae are reasonably combined, so that the degradability of the plastic bag is remarkably improved while the excellent mechanical property is ensured. By optimizing the proportion of the components and the manufacturing process, the product not only has higher tensile strength and durability, but also can be quickly degraded after being used, so that the long-term burden of the plastic bag on the environment is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of environmentally friendly materials, in particular to a degradable plastic woven bag and a manufacturing method thereof. Background Art

[0002] Traditional plastic bags are mainly made of petroleum-based materials such as polyethylene (PE) and polypropylene (PP), which are not only difficult to degrade, but also release harmful substances after degradation, further polluting soil and water sources. Therefore, the development of degradable plastic materials has become an urgent need for the plastics industry. Although current degradable plastic materials can reduce the pollution of plastics to the environment to a certain extent, they generally have problems such as slow degradation rate, high cost, unstable performance, and most technologies cannot take into account both good mechanical properties and degradability at the same time.

[0003] In the existing technology, although degradable materials such as polylactic acid (PLA) and polyhydroxyalkanoates (PHA) have good environmental friendliness, their mechanical properties and durability are poor, especially they are easy to lose their shape under humid and high temperature conditions. Common biodegradable additives, such as composite microalgae and plant amino acids, can promote degradation, but in practical applications they still face the problems of poor stability and slow degradation process, and cannot meet the needs of high strength and high durability in daily life.

[0004] In addition, the existing technology is also lacking in versatility, especially in terms of UV resistance, oxidation resistance, and adaptability to changes in environmental humidity. The performance of many degradable plastic bags is difficult to maintain stable for a long time, resulting in easy damage or incomplete degradation during use, thus affecting their application effect. Summary of the invention

[0005] In view of the deficiencies of the prior art, the present invention provides a degradable plastic woven bag and a manufacturing method thereof to solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions: The embodiment of the present invention provides a degradable plastic woven bag, which includes the following specific components: polylactic acid, polyethylene, a plasticizer, an antioxidant, and an ultraviolet absorber; The mass fractions of the above ingredients are as follows: Polylactic acid is 80-85 parts; Polyethylene is 10-15 parts; Plasticizer is 1-3 parts; Antioxidant: 0.1-0.5 parts; The ultraviolet absorber is 0.1-0.3 parts; The plastic woven bag also includes additives, which include polyhydroxyalkanoates, composite microalgae, nano-scale calcium oxide, modified lignin, bio-based fatty acid esters, calcium phosphate, and plant amino acids; The mass fractions of the additives are as follows: Polyhydroxyalkanoate is 3-5 parts; The compound microalgae is 0.5-1 part; Nano-scale calcium oxide is 0.5-1 part; Modified lignin is 0.5-1 part; Bio-based fatty acid esters: 0.2-0.5 parts; Calcium phosphate is 0.2-0.5 parts; Plant amino acids are 0.1-0.3 parts.

[0007] To further optimize the technical solution, the specific components include: The plasticizer is one of citrate, phthalate or polyether plasticizers; The citric acid ester plasticizer uses di(2-ethylhexyl) citrate; Phthalate plasticizer uses dioctyl ester; The polyether plasticizer is polyethylene glycol dicaprate.

[0008] To further optimize the technical solution, the specific components include: The antioxidant is one of 2,6-di-tert-butyl-p-cresol BHT, allyl phenol antioxidant or organic sulfide antioxidant; The allylphenol antioxidant uses allylphenol; The organic sulfide antioxidant used is 2,2'-diphenylthioamine.

[0009] To further optimize the technical solution, the specific components include: The ultraviolet absorber is one of benzotriazole and stilbene ultraviolet absorbers; The benzotriazole ultraviolet absorber uses 2-phenylbenzotriazole; The stilbene-based ultraviolet absorber uses 2,4-stilbene.

[0010] Further optimizing the technical solution, the composite microalgae is composed of multiple species of microalgae, each of which is used to provide different degradation characteristics, nutrients or catalytic effects; The composite microalgae includes the following microalgae in proportion by weight: 40-50 parts of spirulina, 30-40 parts of chlorella, 10-15 parts of laver; The composite microalgae also includes 5-10 parts of trehalose, which is used to enhance the activity of microorganisms during the degradation process.

[0011] To further optimize the technical solution, the composition of the plant amino acids includes, by mass: Glycine: 20-25 parts; Glutamic acid: 25-30 parts; Aspartic acid: 10-15 parts; Leucine: 10-15 parts; Cysteine: 5-10 parts.

[0012] Further optimizing the technical solution, the polyhydroxyalkanoate PHA and polylactic acid PLA are synergistically degraded through a microbial catalytic reaction, and the ester bond of PHA and the lactic acid unit of PLA undergo a hydrolysis reaction, thereby promoting the degradation of the plastic woven bag; The chemical reaction formula of synergistic degradation is as follows: ; Where: is the polymer chain of PLA; is the polymer chain of PHA; It is a short-chain lactic acid monomer; It is the decomposition product of PHA.

[0013] A method for manufacturing a degradable plastic woven bag, based on the above-mentioned plastic woven bag, comprises the following specific steps: S1. Prepare the raw materials of specific components and additives; S2, melting and mixing the polymer substrate; S3, adding plasticizer, antioxidant, UV absorber and nano-scale calcium oxide to the polymer matrix; S4, adding plant amino acids and compound microalgae to form a mixture; S5, conveying the mixture to an injection molding machine for injection molding; S6. Adding modified lignin and calcium phosphate into the formed plastic woven bag; S7, cooling, finished product inspection and packaging.

[0014] Further optimizing the technical solution, in step S2, the polymer substrate is polylactic acid and polyhydroxyalkanoate, and a twin-screw extruder is used for melting and uniformly mixing; In this process, polylactic acid and polyhydroxyalkanoates form a uniform polymer matrix, and bio-based fatty acid esters are added to lower the melting point, making the polymer matrix easy to shape and providing conditions for subsequent degradation reactions.

[0015] To further optimize the technical solution, in step S7, the finished product inspection includes testing ultraviolet degradation, humidity degradation, mechanical strength, biodegradability, water resistance, and thermal stability in a simulated environment to test the degradation ability of the woven bag.

[0016] Compared with the prior art, the present invention provides a degradable plastic woven bag and a manufacturing method thereof, which has the following beneficial effects: The degradable plastic woven bag and its manufacturing method, by rationally combining multiple additives such as polylactic acid, polyethylene, plasticizer, antioxidant, ultraviolet absorber, composite microalgae, etc., significantly improve the degradability of the plastic bag while ensuring excellent mechanical properties. By optimizing the proportions and manufacturing processes of each component, the product not only has strong tensile strength and durability, but also can be degraded quickly after use, reducing the long-term burden of plastic bags on the environment. In addition, by using materials with strong biodegradation-promoting effects such as plant amino acids and composite microalgae, the woven bag can still maintain a good degradation effect under complex environmental conditions such as humidity and ultraviolet rays, which can effectively reduce the negative impact of traditional plastic bags on the environment, and provide a high-performance degradable plastic bag with environmental protection, functionality and practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 A schematic diagram of the composition of a degradable plastic woven bag proposed by the present invention; Figure 2 The present invention is a schematic flow chart of a method for manufacturing a degradable plastic woven bag. DETAILED DESCRIPTION

[0019] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0020] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0021] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor is it a separate or selective embodiment that is mutually exclusive with other embodiments.

[0022] Embodiment 1: Reference Figure 1 , which is the first embodiment of the present invention, provides a degradable plastic woven bag, wherein the plastic woven bag comprises the following specific components: polylactic acid, polyethylene, a plasticizer, an antioxidant, and an ultraviolet absorber.

[0023] The mass fractions of the above ingredients are as follows: The amount of polylactic acid was 85 parts.

[0024] Polylactic acid is a common biodegradable plastic that provides good mechanical properties and transparency and is suitable for environmentally friendly packaging materials.

[0025] The amount of polyethylene is 15 parts.

[0026] Polyethylene enhances the durability and strength of the bag while maintaining the rigidity and toughness of the woven bag.

[0027] The plasticizer is 3 parts.

[0028] Plasticizers increase the flexibility of woven bags, improve their formability, and make them more durable during use.

[0029] The antioxidant is 0.5 parts.

[0030] Extend the service life of plastics and avoid degradation caused by high temperatures or UV exposure.

[0031] The amount of ultraviolet absorber is 0.3 parts.

[0032] Improve UV resistance to prevent woven bags from being degraded due to long-term exposure to sunlight.

[0033] in: Among the specific components: The plasticizer is one of citrate, phthalate or polyether plasticizers; The citrate plasticizer uses di(2-ethylhexyl) citrate, which has good low-temperature flexibility and excellent biodegradability; Phthalate plasticizers use dioctyl ester, which is widely used to improve the flexibility of plastics; The polyether plasticizer uses polyethylene glycol dicaprate, which can provide good solubility and adapt to a variety of polymers.

[0034] Among the specific components: The antioxidant is one of 2,6-di-tert-butyl-p-cresol BHT, allyl phenol antioxidant or organic sulfide antioxidant; BHT can effectively inhibit thermal degradation and oxidation reactions caused by ultraviolet rays, extending the service life of the material; Allylphenol antioxidants use allylphenol, which has strong antioxidant properties and can be used to improve stability under high temperature conditions; The organic sulfide antioxidant uses 2,2'-diphenylthioamine, which is mainly used to prevent the degradation of polymers due to oxidation.

[0035] Among the specific components: The ultraviolet absorber is one of benzotriazole and stilbene ultraviolet absorbers; Benzotriazole UV absorbers use 2-phenylbenzotriazole, which can effectively absorb UV rays and provide long-term UV shielding effects, making them suitable for plastic materials used outdoors. The diphenylethylene UV absorber uses 2,4-diphenylethylene, which has a strong ability to absorb ultraviolet rays and can improve the durability of plastics under sunlight.

[0036] The plastic woven bag also includes additives, which include polyhydroxyalkanoate, composite microalgae, nano-scale calcium oxide, modified lignin, bio-based fatty acid ester, calcium phosphate, and plant amino acids.

[0037] The mass fractions of the additives are as follows: The amount of polyhydroxyalkanoate is 5 parts.

[0038] Adding it as an additive to plastic woven bags can significantly enhance the degradation performance of the woven bags. PHA can decompose quickly in the natural environment without producing harmful substances, which fully meets environmental protection requirements. Compared with other common biodegradable plastics, PHA has better mechanical properties and lower production costs, and its degradation rate is faster under natural conditions.

[0039] Compound microalgae is 1 serving.

[0040] Compared with traditional additives (such as organic acids and enzymes), microalgae as degradation aids have a milder and non-toxic catalytic effect in the degradation process, and are more environmentally friendly. Compared with traditional chemical degradation additives, microalgae have natural sources, can enhance soil health, and support microbial communities in the ecosystem.

[0041] The composite microalgae is composed of multiple microalgae species, each of which is used to provide different degradation characteristics, nutrients or catalytic effects; The composite microalgae includes the following microalgae in proportion by weight: 40-50 parts of spirulina, 30-40 parts of chlorella, 10-15 parts of laver; The composite microalgae also includes 5-10 parts of trehalose, which is used to enhance the microbial activity during the degradation process.

[0042] Spirulina is rich in polysaccharides, proteins and chlorophyll. It can accelerate the degradation process through its sugars and proteins, provide nutrition for microorganisms, and promote the decomposition of plastics.

[0043] Green algae are rich in minerals such as nitrogen and phosphorus, which can promote the reproduction of microorganisms during the degradation process and improve the biodegradation rate of plastics. The fatty acids in green algae also have a certain catalytic effect on the degradation process of plastics.

[0044] Nori is rich in amino acids, minerals and iodine, which help accelerate the degradation of plastics. The polysaccharide components of nori can more effectively promote the hydrolysis of plastics in a humid environment.

[0045] Trehalose, as a protective sugar, can help composite microalgae maintain activity in adverse environments and has a certain hydration effect, enhancing the activity of microorganisms during the degradation process.

[0046] Nano-scale calcium oxide is 1 part.

[0047] Nano-scale calcium oxide is a new type of catalytic degradation additive with a large specific surface area, which can accelerate chemical reactions during the degradation process. It catalytically degrades the polymer chain structure in plastics, causing the plastic molecules to break and accelerate decomposition. Compared with traditional large-particle calcium oxide, nano-scale calcium oxide has a large surface area and can react with plastic molecules more efficiently, significantly increasing the degradation rate. The catalytic properties of nanomaterials allow the degradation process to be completed at a lower temperature and in a shorter time, improving environmental friendliness.

[0048] The modified lignin is 1 part.

[0049] Lignin is an important component of plant cell walls and has natural biodegradability. After modification, lignin can improve the fracture toughness of woven bags, and can gradually degrade in the environment, promoting the occurrence of other degradation reactions. Lignin can not only improve the mechanical properties of plastics and increase their durability, but also accelerate the degradation process of plastics and avoid the persistent pollution of traditional plastics caused by environmental factors. Compared with traditional plastic reinforcement materials, lignin comes from natural plants and has good renewability and environmental friendliness.

[0050] Bio-based fatty acid esters are 0.5 parts.

[0051] Low-melting-point bio-based fatty acid esters are a derivative based on natural plant oils with a lower melting point, which can help plastics start to degrade at lower temperatures. Their addition can improve the flexibility of plastics and promote easier decomposition of plastics in the environment. Compared with traditional high-melting-point additives, low-melting-point fatty acid esters can promote plastic degradation under a wider range of environmental conditions (such as low temperature and high humidity environments) and increase the degradation rate.

[0052] Calcium phosphate is 0.5 parts.

[0053] Calcium phosphate can release beneficial nutrients during the degradation process. In addition to accelerating the degradation of plastic, it can also improve soil health, which has dual environmental benefits.

[0054] Plant amino acids are 0.3 parts.

[0055] Compared with traditional single chemical degraders, plant amino acids provide a diversified nutritional support that can enhance the biodegradation ability of microorganisms and make the degradation process more efficient.

[0056] The composition of the plant amino acids includes, by weight: Glycine: 25 parts; Glycine is the simplest amino acid with high water solubility. It can provide rapidly available amino acids to microorganisms during the degradation process, promoting the growth of microorganisms and the degradation of plastics.

[0057] Glutamic acid: 30 parts; Glutamic acid is a common plant amino acid with important biological functions. It can provide a rich nitrogen source for microorganisms in the degradation process, help accelerate the reproduction of microorganisms, and thus speed up the degradation rate of plastics.

[0058] Aspartic acid: 15 parts; Aspartic acid is rich in nitrogen sources, which can promote the growth of bacteria and fungi. During the plastic degradation process, it acts as a nitrogen source to support the metabolic activities of microorganisms and improve the degradation efficiency.

[0059] Leucine: 15 parts; Leucine is a branched-chain amino acid that helps promote protein synthesis in microorganisms, provides essential amino acids during the degradation process, and supports the growth and reproduction of microorganisms.

[0060] Cysteine: 10 parts; Cysteine ​​contains sulfur groups, which help to enhance the antioxidant capacity of microorganisms during the degradation process and enhance the adaptability of microorganisms in complex environments, thereby promoting the degradation of plastics.

[0061] In this embodiment, the polyhydroxyalkanoate PHA and polylactic acid PLA are synergistically degraded through a microbial catalytic reaction, and the ester bond of PHA and the lactic acid unit of PLA undergo a hydrolysis reaction, thereby promoting the degradation of the plastic woven bag; The chemical reaction formula of synergistic degradation is as follows: ; Where: is the polymer chain of PLA, and n represents the number of repeating units of the polylactic acid molecular chain; is the polymer chain of PHA, and m represents the number of repeating units of the polyhydroxyalkanoate chain; is a short-chain lactic acid monomer, and p represents the number or proportion of lactic acid molecules generated in the reaction; is the product after PHA decomposition, and q represents the number or proportion of short-chain products generated by PHA decomposition. The synergistic hydrolysis reaction decomposes PLA and PHA into short-chain lactic acid monomers and other intermediates, thereby accelerating the degradation process.

[0062] Embodiment 2: Reference Figure 2 , which is the second embodiment of the present invention, and provides a method for manufacturing a degradable plastic woven bag, based on the plastic woven bag described in the first embodiment, comprising the following specific steps: S1. Prepare the raw materials of specific components and additives.

[0063] At the same time, polylactic acid and polyethylene are dried to remove moisture to ensure that the raw materials are not affected by moisture in subsequent processes. Polyethylene can also be used as a reinforcing material in this step to provide certain strength and tensile resistance. Nano-scale calcium oxide, as a catalyst, needs to be finely dispersed to ensure its maximum activity. Plant amino acids and composite microalgae need to be crushed or dissolved so that they can be evenly distributed in the final product.

[0064] S2. Melting and mixing the polymer matrix.

[0065] Polylactic acid (PLA) and polyhydroxyalkanoates (PHA) are mixed and melted and uniformly mixed using a twin-screw extruder. In this process, PLA and PHA will form a uniform polymer matrix. Depending on the different formulations of the additives, the temperature and speed of the extruder can be adjusted to ensure that the polymer is fully melted and forms a stable matrix. In this step, low-melting-point bio-based fatty acid esters are added, which can lower the melting point, make the mixture easier to shape, and provide conditions for subsequent degradation reactions.

[0066] S3. Add plasticizer, antioxidant, UV absorber and nano-scale calcium oxide to the polymer matrix.

[0067] Plasticizers are used to improve the softness and processability of plastics. Antioxidants and UV absorbers can extend the service life of plastic bags and prevent them from premature degradation under UV radiation and oxidative environments. Nano-scale calcium oxide can increase the degradation rate of plastics and promote their biodegradation in the natural environment. The additives in this step provide the necessary conditions for the later degradation of woven bags.

[0068] S4. Add plant amino acids and compound microalgae to form a mixture.

[0069] Plant amino acids can provide nutrition for microorganisms in the degradation process and accelerate the decomposition of plastics. The cell structure and metabolites in the composite microalgae can support the activity of microorganisms during the degradation process, further promoting the degradation of woven bags. This step helps to improve the biodegradability of woven bags in the degradation environment, especially in humid and high temperature environments.

[0070] S5. The mixture is conveyed to an injection molding machine for injection molding.

[0071] During the molding process, the temperature, pressure and cooling rate need to be adjusted to ensure that the plastic has good fluidity and that there are no bubbles, cracks or other defects on the surface of the plastic bag. Through this injection molding method, the woven bag structure formed will have both strength, flexibility and degradation performance.

[0072] S6. Add modified lignin and calcium phosphate into the formed plastic woven bag.

[0073] Modified lignin can effectively accelerate the degradation process of plastics and provide additional nitrogen sources to support the growth of microorganisms. Calcium phosphate helps stabilize the formation of mineralized substances in the degradation process of plastics and promotes their natural degradation. At the same time, in order to enhance the anti-ultraviolet and anti-oxidation capabilities, a layer of ultraviolet absorber and antioxidant is sprayed on the surface of the woven bag to further improve the durability of the plastic bag.

[0074] S7, cooling, finished product inspection and packaging.

[0075] The cooling process is crucial to ensure that the woven bag maintains a stable shape and avoids deformation of the formed plastic bag. After cooling, the woven bag needs to be inspected for quality. If the test is qualified, the woven bag will be packaged through the packaging line to ensure its integrity during transportation.

[0076] In this embodiment, the finished product inspection includes testing ultraviolet degradation, humidity degradation, mechanical strength, biodegradability, water resistance, and thermal stability in a simulated environment to test the degradation ability of the woven bag.

[0077] The test contents are shown in Table 1.

[0078] Table 1 According to the above test results, the degradable plastic woven bags showed good UV degradation ability and were able to achieve a certain degree of degradation (40%) under UV irradiation. In a humid environment, the bags also showed a moderate degradation rate (30%), the surface softened but not completely degraded, and the composition could be further optimized to improve the degradability. In terms of mechanical strength, the test results showed that the strength of the bag reached 18MPa, which met the use requirements. In terms of biodegradability, the 30-day soil degradation test result was 25%, and the biodegradability of the material could be enhanced, especially in the soil environment where the degradation rate was slow. In addition, the bag performed well in terms of water resistance and thermal stability, with no obvious water absorption and structural changes, and had high durability and thermal stability.

[0079] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A degradable plastic woven bag, characterized in that: The plastic woven bag comprises the following specific components: polylactic acid, polyethylene, plasticizer, antioxidant, and ultraviolet absorber; The mass fractions of the above ingredients are as follows: Polylactic acid is 80-85 parts; Polyethylene is 10-15 parts; Plasticizer is 1-3 parts; Antioxidant: 0.1-0.5 parts; The ultraviolet absorber is 0.1-0.3 parts; The plastic woven bag also includes additives, which include polyhydroxyalkanoates, composite microalgae, nano-scale calcium oxide, modified lignin, bio-based fatty acid esters, calcium phosphate, and plant amino acids; The mass fractions of the additives are as follows: Polyhydroxyalkanoate is 3-5 parts; The compound microalgae is 0.5-1 part; Nano-scale calcium oxide is 0.5-1 part; Modified lignin is 0.5-1 part; Bio-based fatty acid esters: 0.2-0.5 parts; Calcium phosphate is 0.2-0.5 parts; Plant amino acids are 0.1-0.3 parts.

2. A degradable plastic woven bag according to claim 1, characterized in that: Among the specific components: The plasticizer is one of citrate, phthalate or polyether plasticizers; The citric acid ester plasticizer uses di(2-ethylhexyl) citrate; Phthalate plasticizer uses dioctyl ester; The polyether plasticizer is polyethylene glycol dicaprate.

3. A degradable plastic woven bag according to claim 1, characterized in that: Among the specific components: The antioxidant is one of 2,6-di-tert-butyl-p-cresol BHT, allyl phenol antioxidant or organic sulfide antioxidant; The allylphenol antioxidant uses allylphenol; The organic sulfide antioxidant used is 2,2'-diphenylthioamine.

4. A degradable plastic woven bag according to claim 1, characterized in that: Among the specific components: The ultraviolet absorber is one of benzotriazole and stilbene ultraviolet absorbers; The benzotriazole ultraviolet absorber uses 2-phenylbenzotriazole; The stilbene-based ultraviolet absorber uses 2,4-stilbene.

5. A degradable plastic woven bag according to claim 1, characterized in that: The composite microalgae is composed of multiple microalgae species, each of which is used to provide different degradation characteristics, nutrients or catalytic effects; The composite microalgae includes the following microalgae in proportion by weight: 40-50 parts of spirulina, 30-40 parts of chlorella, 10-15 parts of laver; The composite microalgae also includes 5-10 parts of trehalose, which is used to enhance the activity of microorganisms during the degradation process.

6. A degradable plastic woven bag according to claim 1, characterized in that: The composition of the plant amino acids includes, by weight: Glycine: 20-25 parts; Glutamic acid: 25-30 parts; Aspartic acid: 10-15 parts; Leucine: 10-15 parts; Cysteine: 5-10 parts.

7. A degradable plastic woven bag according to claim 1, characterized in that: The polyhydroxyalkanoate PHA and polylactic acid PLA are synergistically degraded through a microbial catalytic reaction, and the ester bond of PHA and the lactic acid unit of PLA undergo a hydrolysis reaction, thereby promoting the degradation of the plastic woven bag; The chemical reaction formula of synergistic degradation is as follows: ； Where: is the polymer chain of PLA; is the polymer chain of PHA; It is a short-chain lactic acid monomer; It is the decomposition product of PHA.

8. A method for manufacturing a degradable plastic woven bag, based on the plastic woven bag according to any one of claims 1 to 7, characterized in that: The specific steps include: S1. Prepare the raw materials of specific components and additives; S2, melting and mixing the polymer substrate; S3, adding plasticizer, antioxidant, UV absorber and nano-scale calcium oxide to the polymer matrix; S4, adding plant amino acids and compound microalgae to form a mixture; S5, conveying the mixture to an injection molding machine for injection molding; S6. Adding modified lignin and calcium phosphate into the formed plastic woven bag; S7, cooling, finished product inspection and packaging.

9. The method for manufacturing a degradable plastic woven bag according to claim 8, characterized in that: In the step S2, the polymer substrate is polylactic acid and polyhydroxyalkanoate, and a twin-screw extruder is used to perform melting and uniform mixing; In this process, polylactic acid and polyhydroxyalkanoates form a uniform polymer matrix, and bio-based fatty acid esters are added to lower the melting point, making the polymer matrix easy to shape and providing conditions for subsequent degradation reactions.

10. The method for manufacturing a degradable plastic woven bag according to claim 8, characterized in that: In step S7, the finished product inspection includes testing ultraviolet degradation, humidity degradation, mechanical strength, biodegradability, water resistance, and thermal stability in a simulated environment to test the degradation ability of the woven bag.

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