Biodegradable mulching film capable of releasing deinsectization composite plant essential oil

Abstract

According to the biodegradable mulching film capable of releasing the deinsectization composite plant essential oil, provided by the utility model, the biodegradable mulching film is constructed by stacking the degradable upper layer structure, the middle layer structure and the lower layer structure, and the deinsectization composite plant essential oil is encapsulated by matching the drug carrier with the starch ester film unit; the plant essential oil is used as a pesticide carrier, the pesticide carrier is matched with the starch ester thin film unit to be mingled in the degradable pesticide layer, slow release of the plant essential oil is achieved in the degradation process, the plant essential oil is applied in a diffusion mode, and therefore the long-term and stable deinsectization effect on crops is achieved. The purpose of reducing the use frequency and the total use amount of agricultural insecticides and reducing environmental pollution caused by use of the agricultural insecticides is achieved, meanwhile, the mulching film is made of degradable materials, the whole mulching film is degradable, and the white pollution problem caused by use of the agricultural mulching film can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of ground films, in particular to a biodegradable ground film capable of releasing insecticide composite plant essential oil. Background Art

[0002] Agricultural mulch films are important agricultural production materials, providing moisture retention, heat preservation, insect resistance, disease prevention, and weed suppression. my country is a major user of agricultural mulch films, with annual usage increasing year by year. Currently, commonly used agricultural mulch films are difficult to recycle and biodegrade in the natural environment. The resulting residual film and microplastic pollution pose a serious threat to the ecological environment, affecting the soil structure, moisture and nutrient transport within the cultivated layer, adversely affecting plant growth, and altering the composition of soil microorganisms. These factors have drawn widespread attention to biodegradable mulch films, and their research and development has become a key strategic direction for the development of the plastics industry and agriculture.

[0003] Biodegradable mulch films typically have a thickness of around 0.01-0.03mm. However, studies have shown that in specific applications, such as covering certain crops, the film thickness may reach 6-15 microns (0.006-0.015mm) or even thicker. For example, 8-12 micron black biodegradable mulch films are suitable for crops such as melons, vegetables, potatoes, beans, and tobacco in Yunnan and Hainan.

[0004] Existing biodegradable mulch films are typically used to achieve functions such as heat preservation, water retention, soil moisture retention, and wind and sand control. For example, patent publication number CN118725528A discloses a fully biodegradable mulch film that blocks weeds and its preparation method. By blending modified PPC-TPU with PLA / PBAT, the film's gas and water barrier properties can be improved. The gas barrier property reduces the carbon dioxide content inside the film, inhibiting weed photosynthesis and increasing the film's barrier properties against weeds.

[0005] Another example is a nanofiber-reinforced biodegradable mulch and its preparation method, which is disclosed in patent publication number CN118359832A. This invention improves the tensile strength, tear resistance and wear resistance of the mulch by designing a nanofiber-reinforced biodegradable mulch, solves the problems of poor biodegradability, mechanical properties and biocompatibility of traditional mulch, improves soil structure, and increases soil air permeability and water permeability.

[0006] Pesticides are often required in the agricultural production process. The cost of applying pesticides is high and time-consuming. The problem of environmental pollution caused by pesticide residues is becoming increasingly serious. At the same time, it is difficult to prevent and control sudden biological disasters. The biodegradable mulch films in the existing technology cannot provide the function of applying pesticides, which may lead to time, economy, sudden disasters and excessive use of pesticides caused by manual or machine spraying of pesticides. Utility Model Content

[0007] To this end, it is necessary to provide a biodegradable mulch film that can release insecticide composite plant essential oils to solve the problem that existing biodegradable mulch films cannot provide the function of applying pesticides, and reduce the time, economy, sudden disasters and excessive use of pesticides caused by manual or machine spraying of pesticides.

[0008] To achieve the above-mentioned purpose, the utility model provides a biodegradable ground film that can release insecticide composite plant essential oil, comprising a lower structure, a middle structure and an upper structure arranged in sequence from bottom to top, the upper structure including a wear-resistant layer; the middle structure includes a base film layer and a reinforcement layer arranged in sequence from bottom to top, the lower structure includes a drug layer containing multiple drug carriers, the drug carriers are wrapped with emulsion-like or granular composite plant essential oil; the drug layer is composed of multiple starch ester film units arranged in an array with a certain interval.

[0009] Furthermore, the starch ester film unit is cylindrical, has a thickness of 10 μm, a bottom diameter of 4 mm, and a spacing of 2 mm between adjacent starch ester film units.

[0010] This arrangement facilitates encapsulating the insecticide compound plant essential oil in an emulsion state or intercalating it in a granular state onto a drug carrier and / or drug layer to form an underground layer structure with a good pesticide attachment structure. Each unit of the drug layer is designed to be cylindrical, which occupies a smaller area and enables more uniform drug release. This also allows for the formation of air circulation channels between the units, which is beneficial for soil ventilation and drainage, maintaining appropriate soil moisture, and providing the appropriate temperature and sufficient oxygen for the root system of the crop. At the same time, the thickness of 10 μm ensures that the drug layer has a certain support and strength, and a certain degradation cycle, which can achieve the purpose of continuously releasing the insecticide compound plant essential oil.

[0011] Furthermore, it also includes a plurality of rainwater collecting pipes, which pass through the upper structure and the middle structure, and the medicine layer is not provided below the pipe openings of the rainwater collecting pipes.

[0012] This design accelerates soil air circulation on sunny days, increasing soil oxygen content and improving the permeability of the mulch film. On rainy days, it collects some rainwater, controlling soil moisture, ensuring crops receive the water they need for growth while reducing irrigation frequency. Positioning the pipe between the upper and middle layers prevents direct contact between the rainwater collection pipe and the soil, preventing capillary action when the soil is moist, which could lead to clogging.

[0013] Furthermore, a first adhesive layer is provided between the rainwater collecting pipe and the upper structure and the middle structure; and / or

[0014] A second adhesive layer is provided between the upper structure and the middle structure; and / or

[0015] A third adhesive layer is provided between the middle structure and the lower structure.

[0016] By providing the first adhesive layer / or the second adhesive layer / or the third adhesive layer, a closer layer connection is formed between the upper layer and the rainwater collection pipe, and / or the rainwater collection pipe and the middle layer, and / or the middle layer and the lower layer, so that the biodegradable mulch film that can release insecticide composite plant essential oil has better integrity, overall strength and weather resistance.

[0017] Furthermore, the first adhesive layer, the second adhesive layer, and the third adhesive layer are all composed of degradable adhesives.

[0018] Furthermore, the material of the degradable adhesive is PLA and / or PCL.

[0019] PLA and PCL are both biodegradable materials. PLA-PCL hot melt adhesive is a biodegradable adhesive with excellent adhesion and comprehensive properties. As the biodegradable mulch degrades, the first and second adhesive layers also degrade, achieving complete degradation of the biodegradable mulch.

[0020] Furthermore, the substrate film layer is a PBAT / PLA film layer; and / or

[0021] The reinforcing layer is a PGA / PBAT thin film layer; and / or

[0022] The wear-resistant layer is a TPU film layer.

[0023] Furthermore, the thickness of the substrate film layer is 20 μm; and / or

[0024] The thickness of the reinforcement layer is 20 μm; and / or

[0025] The wear-resistant layer has a thickness of 30 μm.

[0026] PBAT / PLA are common biodegradable plastic raw materials. PBAT and PLA are both biodegradable materials. PBAT / PLA composites combine the advantages of PBAT and PLA, offering high heat resistance, good mechanical properties, and hydrolysis resistance. Furthermore, PBAT and PLA production technology is more mature than other biodegradable materials, resulting in lower costs, making them suitable as the base film layer for biodegradable mulch. The film thickness should be neither too high nor too low; a thickness of 20µm provides good support, transparency, and strength.

[0027] PGA is a petroleum-based biodegradable material with good gas barrier properties and biocompatibility. It is mostly used in the field of medical materials. It can not only bear the strength of biodegradable mulch, but can also be degraded by soil, reducing white pollution.

[0028] TPU is a soft and elastic polymer biomaterial with high mechanical strength. It is a commonly used wear-resistant and fold-resistant material. Considering that the wear-resistant layer is the part of the biodegradable mulch film in this application that is most directly facing the external environment, the thickness of the TPU wear-resistant layer is set to 30 µm, which is thicker than the base film layer and the reinforcement layer, but still has good air permeability and light transmittance.

[0029] Furthermore, the rainwater collection pipe is a PBAT pipe with a length of 65 μm and a diameter of 2 mm.

[0030] This arrangement coordinates the thickness of the wear-resistant layer, the base film layer and the reinforcement layer to improve the efficiency of directing rainwater from the outer surface of the ground film to the interior.

[0031] Furthermore, the drug carrier is water-soluble chitosan.

[0032] Water-soluble chitosan is a natural high-molecular polymer extracted from animal shells with excellent biocompatibility and biodegradability. By encapsulating compound plant essential oils with water-soluble chitosan and combining it with starch ester film units to control the slow release of the compound plant essential oils, long-term and stable pest control effects on crops can be achieved.

[0033] Different from the existing technology, the above technical scheme constructs a biodegradable mulch film by stacking a degradable upper structure, a middle structure and a lower structure, encapsulates the insect-repellent composite plant essential oil by using a drug carrier in combination with a starch ester film unit, and the drug carrier and the starch ester film unit are interspersed in the degradable drug layer, so that the plant essential oil is slowly released during the degradation process. The plant essential oil is applied by diffusion, thereby achieving a long-term and stable effect of pest control on crops, thereby achieving the purpose of reducing the number of times and total usage of agricultural pesticides and reducing environmental pollution caused by the use of pesticides. At the same time, the mulch film is made of degradable materials and is degradable as a whole, which can reduce the white pollution problem caused by the use of agricultural mulch film. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is a cross-sectional view of the structural layers of the biodegradable mulch film described in the specific embodiment;

[0035] Figure 2 This is a cross-sectional view of the structural layer of the biodegradable ground film provided with a rainwater collection pipe according to a specific embodiment;

[0036] Figure 3This is a cross-sectional view of the structure of the biodegradable ground film according to the specific embodiment, which is provided with a first adhesive layer, a second adhesive layer, and a third adhesive layer;

[0037] Figure 4 It is a three-dimensional diagram of the starch ester film unit described in the specific embodiment;

[0038] Figure 5 It is a top view of the starch ester film unit described in the specific embodiment.

[0039] Description of reference numerals:

[0040] 10. Wear-resistant layer; 20. Base film layer; 30. Reinforcement layer; 40. Drug layer; 402. Starch ester film unit; 401. Drug carrier; 50. Rainwater collection pipe; 61. First adhesive layer; 62. Second adhesive layer; 63. Third adhesive layer. DETAILED DESCRIPTION

[0041] In order to explain the technical content, structural features, achieved objectives and effects of the technical solution in detail, the following is a detailed description in conjunction with specific embodiments and accompanying drawings.

[0042] References to "embodiments" herein mean that the specific features, structures, or characteristics described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the word "embodiment" in various places in the specification does not necessarily refer to the same embodiment, nor does it particularly limit its independence or relevance to other embodiments. In principle, in this application, as long as there are no technical contradictions or conflicts, the various technical features mentioned in the embodiments can be combined in any manner to form a corresponding implementable technical solution.

[0043] Unless otherwise defined, the technical terms used herein have the same meanings as those generally understood by those skilled in the art to which this application belongs; the use of relevant terms herein is only for describing specific embodiments and is not intended to limit this application.

[0044] In the description of this application, the term "and / or" is used to describe a logical relationship between objects, indicating that three possible relationships exist. For example, A and / or B means: A exists, B exists, and both A and B exist. In addition, the character " / " in this document generally indicates that the objects before and after are in a logical "or" relationship.

[0045] In this application, terms such as "first" and "second" are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual quantity, priority or sequence relationship between these entities or operations.

[0046] Without further limitations, in this application, the words "include", "comprise", "have" or other similar expressions used in the sentences are intended to cover non-exclusive inclusion. These expressions do not exclude the presence of additional elements in the process, method or product including the elements, so that the process, method or product including a series of elements may include not only those defined elements, but also other elements not explicitly listed, or elements inherent to such process, method or product.

[0047] Consistent with the understanding in the Examination Guidelines, in this application, expressions such as "greater than," "less than," and "exceed" are understood to exclude the number itself; expressions such as "above," "below," and "within" are understood to include the number itself. Furthermore, in the description of the embodiments of this application, "multiple" means two or more (including two), and similar expressions related to "multiple," such as "multiple groups" and "multiple times," are also understood in this manner, unless otherwise specifically defined.

[0048] In the description of the embodiments of the present application, the space-related expressions used, such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "vertical", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or position relationship based on the orientation or position relationship shown in the specific embodiments or drawings, and are only for the convenience of describing the specific embodiments of the present application or facilitating the reader's understanding, and do not indicate or imply that the device or component referred to must have a specific position, a specific orientation, or be constructed or operated in a specific orientation. Therefore, it should not be understood as a limitation on the embodiments of the present application.

[0049] Unless otherwise expressly specified or limited, in the description of the embodiments of the present application, the terms "installed", "connected", "connected", "fixed", "set", etc. used should be understood in a broad sense. For example, the "connection" can be a fixed connection, a detachable connection, or an integrated setting; it can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. For those skilled in the art of the present application, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0050] See also Figures 1 to 5This embodiment provides a biodegradable mulch film that releases an insecticide-resistant composite plant essential oil, comprising a lower structure, a middle structure, and an upper structure arranged sequentially from bottom to top. The upper structure comprises a wear-resistant layer 10, which can enhance the wear resistance of the outer surface of the mulch film. The wear-resistant layer 10 also helps prevent the mulch film from being punctured by sharp objects during use, thereby avoiding premature failure of the mulch film and extending the service life of the mulch film. The middle structure comprises a base film layer 20 and a reinforcement layer 30, which are arranged sequentially from bottom to top. The base film layer 20 serves as an intermediate layer connecting the upper wear-resistant layer 10 and the lower reinforcement layer 30, respectively, to improve the overall stability of the mulch film. The reinforcement layer 30 mainly serves to improve the durability and performance of the mulch film. This reinforcing layer 30 usually increases the thickness and strength of the ground film, making it more resistant to the influence of the natural environment, such as wind and sun, thereby extending the service life of the ground film. Specifically, the reinforcing layer 30 works in the following aspects: Improving durability. The reinforcing layer 30 makes the ground film thicker and less prone to damage, reducing the problem of damage caused by wind and sun during use; Enhancing tensile strength. The reinforcing layer 30 increases the tensile strength of the ground film, making it less likely to tear or break during use, thereby improving the stability of the ground film; Improving the use effect. By enhancing the thermal insulation and moisture retention properties of the ground film, it helps crops grow better and increases yield and quality. The lower structure includes a drug layer 40 containing multiple drug carriers 401. The pesticide carriers are polylactic acid and lignin. The drug carriers 401 are coated with emulsion-like or granular composite plant essential oils. The drug layer 40 is composed of multiple starch ester film units 402 arranged in an array at a certain interval. The starch ester film unit 402 is composed of amylose and amylopectin. Its molecular chain structure determines the film's mechanical properties and thermal stability, resulting in excellent tensile and tear strength. Compared to traditional plastic films, it offers improved air permeability and moisture retention. The starch ester film unit 402 exhibits excellent biocompatibility and biodegradability, slowly releasing the composite plant essential oil within the starch ester film unit through microbial degradation. This is environmentally friendly and can be used in conjunction with the drug carrier 401 to achieve sustained and controlled release of the composite plant essential oil with insecticide properties.

[0051] It should be noted that the pesticide carrier can be made into drug-loaded microcapsules using zeolite, shell powder or carbon nanotubes. The microcapsules are nanoscale, and composite plant essential oils are embedded in such microcapsules. During degradation, the slow release of the composite plant essential oils is achieved, so that the composite plant essential oils can be continuously and slowly released into the crop growth environment, and a certain concentration is maintained for a long time. Taking zeolite as an example, the zeolite drug preparation method of patent publication number CN104606261A can be referred to, and the composite plant essential oils are used to replace their drug parts for preparation. The porous structure of zeolite itself is used to achieve the slow release of the composite plant essential oils. The principle of action of preparing microcapsules using shell powder or carbon nanotubes as raw materials is similar to that of zeolite; or the preparation method of spice nano-microcapsules of patent publication number CN100999697A can be referred to, and the spice parts of the composite plant essential oils are used to replace their spice parts for preparation, which can also achieve the effect of slowly releasing the composite plant essential oils.

[0052] It should be noted that the composite plant essential oil contains components with insect repellent and insecticidal effects, and can be commercially available insecticidal composite plant essential oils. Reference can also be made to Patent Publication No. CN102428973B, "Agricultural Insecticide Containing Plant Essential Oil and Its Application," which discloses a plant essential oil containing an insecticidal active ingredient.

[0053] The utility model provides a biodegradable mulch film capable of releasing an insect-repellent composite plant essential oil. The biodegradable mulch film is constructed by stacking a degradable upper structure, a middle structure, and a lower structure. The insect-repellent composite plant essential oil is encapsulated by a drug carrier 401 in combination with a starch ester film unit 402, and the drug carrier 401 and the starch ester film unit 402 are sandwiched in a degradable drug layer 40. During the degradation process, the plant essential oil is slowly released, and the plant essential oil is applied by diffusion, thereby achieving a long-term and stable effect of removing insects from crops, thereby achieving the purpose of reducing the number of times agricultural pesticides are used, the total amount used, and reducing the environmental pollution caused by the use of pesticides. At the same time, the mulch film is made of degradable materials and is degradable as a whole, which can reduce the white pollution problem caused by the use of agricultural mulch films.

[0054] Preferably, the starch ester film unit 402 is cylindrical, 10 μm thick, and 4 mm in diameter at the bottom. The spacing between adjacent starch ester film units 402 is 2 mm. This arrangement facilitates encapsulating the insecticide composite plant essential oil in an emulsion state or intercalating it in a granular state onto the drug carrier 401 and / or the drug layer 40 to form an underground structure with a good pesticide attachment structure. Each unit of the drug layer 40 is designed to be cylindrical, which occupies a smaller area and enables more uniform drug release. This also allows for the formation of air circulation channels between the units, which is beneficial to soil ventilation and drainage, maintaining appropriate soil moisture, and providing a suitable temperature and sufficient oxygen for the root system of the crop. At the same time, the thickness of 10 μm ensures that the drug layer 40 has a certain support and strength, and a certain degradation cycle, thereby achieving the purpose of continuously releasing the insecticide composite plant essential oil.

[0055] Preferably, multiple rainwater collection pipes 50 are included, extending through the upper and middle structures. No drug layer 40 is provided below the openings of these pipes. This design accelerates soil air circulation on sunny days, increasing soil oxygen content and improving the permeability of the ground film. On rainy days, it can also collect some rainwater, controlling soil moisture, ensuring crops receive the necessary moisture for growth, and reducing irrigation frequency. Positioning the pipes between the upper and middle layers prevents direct contact between the pipes and the soil, preventing capillary action when the soil is moist, which could lead to clogging.

[0056] Preferably, a first adhesive layer 61 is provided between the rainwater collection pipe and both the upper structure and the middle structure; and / or a second adhesive layer 62 is provided between the upper structure and the middle structure; and / or a third adhesive layer 63 is provided between the middle structure and the lower structure. By providing the first adhesive layer, the second adhesive layer, and / or the third adhesive layer, a tighter layer connection is formed between the upper layer and the rainwater collection pipe, and / or between the rainwater collection pipe and the middle layer, and / or between the middle layer and the lower layer, thereby improving the integrity, overall strength, and weather resistance of the biodegradable mulch film capable of releasing the insecticide-releasing composite plant essential oil.

[0057] Preferably, the first, second, and third adhesive layers are all composed of a degradable adhesive. The degradable adhesive is made of PLA and / or PCL. PLA and PCL are both biodegradable materials, and PLA-PCL hot melt adhesive is a biodegradable adhesive with excellent adhesion and overall performance. This allows the first and second adhesive layers to degrade during the biodegradable mulch film's degradation process, achieving complete degradation of the biodegradable mulch film.

[0058] Preferably, the substrate film layer 20 is a PBAT / PLA film layer with a thickness of 20 μm. PBAT / PLA are common biodegradable plastic raw materials. PBAT and PLA are biodegradable materials. PBAT / PLA composite materials combine the advantages of PBAT and PLA, offering high heat resistance, good mechanical properties, and hydrolysis resistance. Furthermore, PBAT and PLA production technologies are more mature and cost-effective than other biodegradable materials, making them suitable as the substrate film layer 20 for biodegradable mulch. The film layer should be neither too thick nor too thin; a thickness of 20 μm provides good support, transparency, and strength.

[0059] Preferably, the reinforcing layer 30 is a PGA / PBAT film layer with a thickness of 20 μm. PGA is a petroleum-based degradable material with good gas barrier properties and biocompatibility. It is mostly used in the field of medical materials. It can not only bear the strength of biodegradable mulch, but also be degraded by soil, reducing white pollution.

[0060] Preferably, the wear-resistant layer 10 is a TPU film layer with a thickness of 30 μm. TPU is a soft and elastic polymer biomaterial with high mechanical strength and is a commonly used wear-resistant and fold-resistant material. Considering that the wear-resistant layer 10 is the part of the biodegradable ground film in this application that is most directly exposed to the external environment, the thickness of the TPU wear-resistant layer 10 is set to 30 μm, which is thicker than the base film layer 20 and the reinforcement layer 30, while still maintaining good air permeability and light transmittance.

[0061] Preferably, the rainwater collection pipe is a PBAT pipe with a length of 65 μm and a diameter of 2 mm. This configuration is coordinated with the thickness of the wear-resistant layer 10, the base film layer 20 and the reinforcement layer 30 to improve the efficiency of guiding rainwater from the outer surface of the ground film into the interior.

[0062] Preferably, the drug carrier 401 is water-soluble chitosan. Water-soluble chitosan is a natural high-molecular polymer extracted from animal shells with excellent biocompatibility and biodegradability. By encapsulating the composite plant essential oil with the water-soluble chitosan and combining it with the starch ester film unit 402 to control the slow release of the composite plant essential oil, a long-term and stable pest control effect on crops is achieved.

[0063] It should be noted that although the above embodiments have been described herein, this does not limit the scope of patent protection of the present utility model. Therefore, based on the innovative concept of the present utility model, changes and modifications to the embodiments described herein, or equivalent structural or process transformations made using the contents of the present utility model specification and drawings, and direct or indirect application of the above technical solutions to other related technical fields are all included in the scope of protection of the present utility model patent.

Claims

1. A biodegradable mulch film capable of releasing an insecticide composite plant essential oil, characterized in that: The invention comprises a lower structure, a middle structure and an upper structure arranged in sequence from bottom to top, wherein the upper structure comprises a wear-resistant layer; the middle structure comprises a base film layer and a reinforcement layer arranged in sequence from bottom to top; the lower structure comprises a drug layer containing a plurality of drug carriers, wherein the drug carriers are wrapped with emulsion-like or granular composite plant essential oils; the drug layer is composed of a plurality of starch ester film units arranged in an array at a certain interval.

2. The biodegradable mulch film capable of releasing insecticide composite plant essential oil according to claim 1, characterized in that: The starch ester film unit is cylindrical, has a thickness of 10 μm, a bottom diameter of 4 mm, and a spacing of 2 mm between adjacent starch ester film units.

3. The biodegradable mulch film capable of releasing insecticide composite plant essential oil according to claim 1, characterized in that: The invention also includes a plurality of rainwater collecting pipes, which pass through the upper structure and the middle structure. The medicine layer is not arranged below the pipe openings of the rainwater collecting pipes.

4. The biodegradable mulch film capable of releasing insecticide composite plant essential oil according to claim 3, characterized in that: A first adhesive layer is provided between the rainwater collecting pipe and the upper structure and the middle structure; and / or A second adhesive layer is provided between the upper structure and the middle structure; and / or A third adhesive layer is provided between the middle structure and the lower structure.

5. The biodegradable mulch film capable of releasing insecticide composite plant essential oil according to claim 4, characterized in that: The first adhesive layer, the second adhesive layer and the third adhesive layer are all composed of degradable adhesives.

6. The biodegradable mulch film capable of releasing insecticide composite plant essential oil according to claim 5, characterized in that: The material of the degradable adhesive is PLA and / or PCL.

7. The biodegradable mulch film capable of releasing insecticide composite plant essential oil according to claim 3, characterized in that: The substrate film layer is a PBAT / PLA film layer; and / or The reinforcing layer is a PGA / PBAT thin film layer; and / or The wear-resistant layer is a TPU film layer.

8. The biodegradable mulch film capable of releasing insecticide composite plant essential oil according to claim 7, characterized in that: The thickness of the substrate film layer is 20 μm; and / or The thickness of the reinforcement layer is 20 μm; and / or The wear-resistant layer has a thickness of 30 μm.

9. The biodegradable mulch film capable of releasing insecticide composite plant essential oil according to claim 8, characterized in that: The rainwater collection pipe is a PBAT pipe with a length of 65 μm and a diameter of 2 mm.

10. The biodegradable mulch film capable of releasing insecticide composite plant essential oil according to claim 1, characterized in that: The drug carrier is water-soluble chitosan.

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