An antioxidant agricultural mulching film containing artemisia extract and a preparation method thereof

Abstract

This invention relates to an antioxidant agricultural mulch film containing Artemisia argyi extract and its preparation method, belonging to the technical field of agricultural functional materials. The antioxidant agricultural mulch film containing Artemisia argyi extract comprises the following raw materials in parts by weight: 50-80 parts organic film substrate, 5-20 parts Artemisia argyi acid extract, 3-10 parts plasticizer, 1-5 parts crosslinking agent, 1-3 parts stabilizer, and 10-20 parts water. The Artemisia argyi acid extract is obtained by extracting Artemisia argyi with citric acid. The preparation method of this antioxidant agricultural mulch film covalently fixes the Artemisia argyi acid extract into the three-dimensional network of the film, forming a synergistic and long-lasting antioxidant system with the stabilizer, solving the problems of easy loss of natural active ingredients and short-term antioxidant effect. The antioxidant agricultural mulch film containing Artemisia argyi extract exhibits long-lasting and stable antioxidant performance, with a service life of 5-7 months under natural sunlight, reducing film replacement and lowering agricultural costs. It aligns with the trend of green agriculture development and has industrial application value and broad market prospects.

Description

Technical Field

[0001] This invention belongs to the field of agricultural functional materials technology, specifically relating to an antioxidant agricultural mulch film containing Artemisia argyi extract and its preparation method. Background Technology

[0002] Agricultural mulch film, an indispensable agricultural input in modern agricultural production, is widely used for heat preservation, moisture retention, weed control, and soil environment improvement, playing a vital role in increasing crop yields and improving the quality of agricultural products. Currently, the preparation technology of organic agricultural mulch film mostly uses natural polymer materials such as starch, chitosan, and cellulose as base materials, offering advantages such as biodegradability and environmental friendliness, effectively solving the soil pollution problem caused by traditional plastic mulch film residues. However, existing organic agricultural films generally have poor antioxidant properties. Under the influence of natural environmental factors such as field sunlight, high temperature, and humidity changes, the film is prone to oxidative degradation, becoming brittle and cracking, unable to maintain its heat preservation and moisture retention functions for a long time, requiring frequent replacement, increasing agricultural production costs and labor intensity.

[0003] To address these issues, existing technologies often employ the addition of antioxidants to improve the performance of agricultural mulch films. However, the addition of chemical reagents can easily lead to soil and crop residues, harming the ecological environment and human health, which does not meet the needs of green agricultural development.

[0004] Artemisia argyi, a widely distributed natural herb, contains various active ingredients such as flavonoids and polysaccharides. It has a certain antioxidant capacity and can scavenge some free radicals. Moreover, Artemisia argyi is widely available, inexpensive, non-toxic, and harmless, posing no harm to the environment or human body. It is an ideal natural functional additive.

[0005] The invention patent with publication number CN112300582A discloses a biodegradable antibacterial film containing artemisia oil and its preparation method. This method involves a simple physical mixing of artemisia oil and a film substrate without modifying the film structure. This results in the artemisia oil being in a free state, easily volatilizing and leaking, and the film lacking long-lasting antioxidant or antibacterial effects. Furthermore, it lacks a dedicated stabilizer and targeted antioxidant design, failing to address the core problem of agricultural mulch films aging easily in the field. Simultaneously, the amount of film substrate used in this technology is extremely low, lacking the mechanical properties required for actual agricultural mulch films and lacking adaptability to agricultural applications. Summary of the Invention

[0006] One objective of this invention is to provide an antioxidant agricultural mulch film containing Artemisia argyi extract. This antioxidant agricultural mulch film fixes Artemisia argyi extract into the molecular network of an organic membrane substrate through a cross-linking reaction mediated by a cross-linking agent. Combined with a stabilizer, Artemisia argyi extract forms a synergistic antioxidant system, enabling the antioxidant agricultural mulch film to possess long-lasting and stable antioxidant properties, excellent structural stability, and good mechanical properties.

[0007] The second objective of this invention is to provide a method for preparing an antioxidant agricultural mulch film containing Artemisia argyi extract.

[0008] To achieve the above objectives, the technical solution adopted by the present invention is as follows: In a first aspect, the present invention provides an antioxidant agricultural mulch film containing Artemisia argyi extract, comprising the following raw materials in parts by weight; The mixture contains 50-80 parts of organic film substrate, 5-20 parts of Artemisia argyi extract, 3-10 parts of plasticizer, 1-5 parts of crosslinking agent, 1-3 parts of stabilizer, and 10-20 parts of water.

[0009] Furthermore, the crosslinking agent is glutaraldehyde or epichlorohydrin; the crosslinking agent is a core modifier of the membrane structure, which fixes the Artemisia argyi extract in the molecular network of the membrane substrate through group crosslinking, thereby preventing the active ingredients from being lost in the natural environment.

[0010] Furthermore, the crosslinking agent is preferably glutaraldehyde.

[0011] Furthermore, the amount of the crosslinking agent is preferably 1 to 3 parts by weight.

[0012] Furthermore, the artemisia acid extract is obtained by extracting artemisia with citric acid.

[0013] Furthermore, the preparation method of the Artemisia argyi acid extract includes the following steps: S1: Crush the stems and leaves of mugwort and sieve them to obtain mugwort powder; S2: The Artemisia argyi powder obtained in S1 is mixed with citric acid solution and extracted, then centrifuged and filtered to obtain supernatant. The supernatant is then concentrated under reduced pressure to obtain concentrated solution. S3: The concentrated liquid obtained in S2 is freeze-dried under vacuum, pulverized and sieved to obtain Artemisia argyi acid extract.

[0014] Furthermore, the sieve mesh number mentioned in S1 is 40 to 60 mesh.

[0015] Furthermore, the mass ratio of the Artemisia argyi powder to the citric acid solution in S2 is 1:(10-80).

[0016] Furthermore, the citric acid solution in S2 has a mass fraction of 0.5–3.5 wt.%.

[0017] Furthermore, the extraction temperature in S2 is 25–80 °C, and the extraction time is 2–4 h.

[0018] Furthermore, the extraction described in S2 also includes stirring during the extraction process, wherein the stirring speed is 100-200 r / min.

[0019] Furthermore, the vacuum concentration described in S2 is vacuum concentration to 20-34% of the volume.

[0020] Furthermore, the total flavonoid content in the Artemisia argyi extract is not less than 30 mg / g, and the polysaccharide content is not less than 60 mg / g.

[0021] Furthermore, the organic membrane substrate is one or more of starch, chitosan, and sodium carboxymethyl cellulose.

[0022] Furthermore, the organic membrane substrate is preferably a mixture of chitosan and starch, and the mass ratio of chitosan to starch in the organic membrane substrate is preferably 1:(2-4). The amino groups of chitosan and the hydroxyl groups of starch form synergistic reaction sites, and the combination of the two can provide abundant active reaction sites, laying the foundation for cross-linking reaction of groups mediated by cross-linking agents. At the same time, the combination of chitosan and starch can synergistically improve the mechanical properties, flexibility and biodegradability of the membrane, adapting to the actual needs of agricultural covering, and can further optimize the antioxidant effect of the membrane in conjunction with Artemisia argyi extract.

[0023] Furthermore, the plasticizer is one or more of glycerol, polyethylene glycol, and sorbitol; the plasticizer can reduce the interaction force between the organic film substrate, effectively improve the flexibility and extensibility of the film, and prevent the film from becoming brittle and cracking due to external stretching, temperature changes and other factors during field use, thus ensuring the field performance of the film.

[0024] Furthermore, the plasticizer is preferably glycerin.

[0025] Furthermore, the stabilizer is vitamin E or tea polyphenols; the stabilizer forms a synergistic antioxidant system with the artemisia argyi extract, and the phenolic hydroxyl groups of the stabilizer and the flavonoids and polysaccharides of the artemisia argyi extract synergistically scavenge free radicals generated in the membrane in the natural environment. At the same time, the stabilizer can bind to the cross-linked network through intermolecular interactions, thus prolonging the duration of the antioxidant effect.

[0026] Secondly, the present invention provides a method for preparing an antioxidant agricultural mulch film containing Artemisia argyi extract as described above, comprising the following steps: Step 1: Add the prescribed amount of organic membrane substrate to water, heat and stir to obtain a substrate solution; Step 2: Add the formulated amount of plasticizer and stabilizer to the substrate solution obtained in Step 1, stir, and obtain a mixed solution; ensure that the plasticizer and stabilizer are fully mixed with the substrate solution, so as to ensure that the plasticizer is evenly dispersed between the organic membrane substrate, and at the same time, ensure that the stabilizer is in full contact with the organic membrane substrate, laying the foundation for the subsequent formation of a synergistic antioxidant system with Artemisia argyi extract; Step 3: Add the prescribed amount of Artemisia argyi extract to the mixed solution obtained in Step 2, stir, and make the Artemisia argyi extract fully contact with the substrate molecules to obtain the composite membrane solution; make the Artemisia argyi extract fully contact and adsorb with the organic membrane substrate to ensure that the subsequent crosslinking agent can simultaneously undergo group crosslinking reaction with the organic membrane substrate and Artemisia argyi extract. Step 4: Add the prescribed amount of crosslinking agent to the composite film liquid obtained in Step 3, stir and pour into a mold, dry. During the drying process, promote the complete crosslinking reaction of the groups to form a dense crosslinking network. After taking it out and cooling to room temperature, peel off the mold to obtain an antioxidant agricultural mulch film containing Artemisia argyi extract.

[0027] Further, the heating and stirring temperature in step 1 is 70-90 °C, and the stirring speed is 200-300 r / minh.

[0028] Furthermore, the stirring time in step 2 is 30 to 60 minutes, and the stirring speed is 100 to 200 r / min.

[0029] Further, the stirring in step 3 is carried out at 60-70 °C for 40-80 min, and the stirring speed is 150-250 r / min.

[0030] Further, the stirring time in step 4 is 20-30 min, the stirring speed is 100-200 r / min; the drying temperature is 50-60 ℃, and the drying time is 1-2 h.

[0031] Furthermore, the drying temperature is preferably 55 °C, and the drying time is preferably 1.5 h.

[0032] Furthermore, step 4, which involves pouring the contents into the mold, also includes scraping a film, the thickness of which is 0.08–0.12 mm.

[0033] Furthermore, the thickness of the scraped film is preferably 0.1 mm.

[0034] The beneficial effects of this invention are: The present invention provides an antioxidant agricultural mulch film containing Artemisia argyi extract. Through a cross-linking reaction mediated by a cross-linking agent, Artemisia argyi acid extract is covalently bonded and fixed in the three-dimensional molecular network of the organic membrane substrate, which completely solves the industry pain points of easy volatility, easy loss, and short-term function of active ingredients in existing Artemisia argyi biodegradable films. At the same time, it is combined with stabilizers to construct a synergistic antioxidant system with Artemisia argyi acid extract, which greatly improves antioxidant efficiency and durability, and achieves long-term stable antioxidant performance of the film.

[0035] The antioxidant agricultural mulch film containing Artemisia argyi extract of the present invention has a service life of 5 to 7 months under natural light conditions, and its antioxidant performance decays slowly, which can effectively reduce the number of times the film needs to be replaced, thereby reducing agricultural production costs and labor intensity.

[0036] The present invention discloses a method for preparing an antioxidant agricultural mulch film containing Artemisia argyi extract. This method uses natural biodegradable polymers as the base material and Artemisia argyi acid extract as the natural antioxidant component. No chemical antioxidants are added, making it non-toxic, harmless, and leaving no soil residue, thus meeting the requirements of green agriculture and ecological environmental protection. Simultaneously, the Artemisia argyi citric acid extract also possesses antibacterial activity, improving the rhizosphere microenvironment of crops and achieving multiple agricultural functions including antioxidant, biodegradable, antibacterial, moisture retention, and weed suppression. The preparation process is simple, cost-controllable, and suitable for industrial mass production, possessing broad market prospects and industrial application value. Attached Figure Description

[0037] Figure 1 This is a comparison chart of the DPPH free radical scavenging rate between the antioxidant agricultural mulch film containing Artemisia argyi extract in Example 1 and the ordinary organic film in Comparative Example 2. Detailed Implementation

[0038] The present invention will be further described below with reference to the embodiments and accompanying drawings.

[0039] In the following examples, the DPPH radical scavenging rate was tested at a wavelength of 517 nm using ultraviolet-visible spectrophotometry, in accordance with GB / T 39115-2020.

[0040] In the following examples, the total flavonoid content was determined at a wavelength of 510 nm using the NaNO2-Al(NO3)3 colorimetric method.

[0041] In the following examples, the polysaccharide content was determined at 490 nm using the phenol-sulfuric acid method.

[0042] In the following examples, the starch used has a fineness of not less than 100 mesh; the chitosan used has a degree of deacetylation of not less than 85% and a viscosity of 100-200 mPa·s; the glutaraldehyde used is a 25% aqueous solution of glutaraldehyde; the epichlorohydrin used has a purity of not less than 99%; and the glycerol, polyethylene glycol, sorbitol, vitamin E, and tea polyphenols used are all food grade.

[0043] Example 1 The antioxidant agricultural mulch film containing Artemisia argyi extract in Example 1 comprises the following raw materials: 15 g chitosan, 35 g starch, 10 g artemisia extract, 5 g glycerol, 2 g glutaraldehyde, 1.5 g vitamin E and 15 g deionized water.

[0044] The preparation method of Artemisia argyi acid extract includes the following steps: Dried Artemisia argyi stems and leaves were pulverized and passed through a 50-mesh sieve to obtain Artemisia argyi powder. The powder was mixed with a 2 wt.% citric acid solution at a mass ratio of 1:12 and extracted at 70 °C for 3 h with stirring at 180 r / min. The mixture was then centrifuged and filtered to obtain the supernatant. The supernatant was concentrated under reduced pressure to 25% of its original volume to obtain a concentrate. The concentrate was then freeze-dried under vacuum, pulverized, and passed through a 90-mesh sieve to obtain the Artemisia argyi acid extract. The total flavonoid content of the obtained Artemisia argyi acid extract was 35.2 mg / g, and the polysaccharide content was 68.7 mg / g.

[0045] The preparation method of the antioxidant agricultural mulch film containing Artemisia argyi extract in Example 1 includes the following steps: Chitosan, starch, glycerol, and vitamin E were dried separately until their moisture content was less than 5%.

[0046] Add the prescribed amounts of chitosan and starch to deionized water, heat to 80 °C and stir at 250 r / min until completely dissolved to obtain the substrate solution.

[0047] Add the prescribed amounts of glycerin and vitamin E to the obtained base solution and stir at 180 r / min for 45 min to obtain a mixed solution.

[0048] Add the prescribed amount of Artemisia argyi extract to the resulting mixed solution and stir at 200 r / min at 65 ℃ for 60 min to obtain the composite membrane solution.

[0049] Add the prescribed amount of glutaraldehyde to the obtained composite film solution, stir at 150 r / min for 25 min, then pour into a film forming mold, control the film thickness at 0.1 mm, dry in an oven at 55 ℃ for 1.5 h, remove, cool to room temperature, peel off the mold, and obtain the antioxidant agricultural mulch film containing Artemisia argyi extract.

[0050] The obtained antioxidant agricultural mulch film containing Artemisia argyi extract is cut to the required size, packaged, and ready for use.

[0051] The antioxidant agricultural mulch film containing Artemisia argyi extract in Example 1 showed a DPPH free radical scavenging rate of 57% and a service life of up to 6 months under natural light conditions. Chitosan molecules are rich in amino (-NH2) and hydroxyl (-OH) groups, while starch molecules are rich in a large number of hydroxyl (-OH) groups. Both provide abundant active reaction sites, laying the foundation for cross-linking reactions mediated by cross-linking agents. At the same time, the combination of chitosan and starch synergistically improves the mechanical properties, flexibility, and biodegradability of the film, meeting the actual needs of agricultural mulching, and further optimizes the antioxidant effect of the film in conjunction with Artemisia argyi extract.

[0052] Example 2 The antioxidant agricultural mulch film containing Artemisia argyi extract in Example 2 comprises the following raw materials: 50 g starch, 5 g Artemisia argyi extract, 3 g polyethylene glycol, 1 g epichlorohydrin, 1 g tea polyphenols, and 10 g deionized water.

[0053] The preparation method of Artemisia argyi acid extract includes the following steps: Dried Artemisia argyi stems and leaves were pulverized and passed through a 40-mesh sieve to obtain Artemisia argyi powder. The powder was mixed with a 3 wt.% citric acid solution at a mass ratio of 1:10 and extracted at 60 °C for 2 h with stirring at 150 r / min. The mixture was then centrifuged and filtered to obtain the supernatant. The supernatant was concentrated under reduced pressure to 20% of its original volume to obtain a concentrate. The concentrate was then freeze-dried under vacuum, pulverized, and passed through an 80-mesh sieve to obtain the Artemisia argyi acid extract. The total flavonoid content of the obtained Artemisia argyi acid extract was 31.5 mg / g, and the polysaccharide content was 62.3 mg / g.

[0054] The preparation method of the antioxidant agricultural mulch film containing Artemisia argyi extract in Example 2 includes the following steps: Starch, polyethylene glycol, and tea polyphenols were dried separately until their moisture content was less than 5%.

[0055] Add the prescribed amount of starch to deionized water, heat to 70 ℃ and stir at 200 r / min until completely dissolved to obtain the base material solution.

[0056] Add the prescribed amounts of polyethylene glycol and tea polyphenols to the obtained substrate solution and stir at 150 r / min for 30 min to obtain a mixed solution.

[0057] Add the prescribed amount of Artemisia argyi extract to the resulting mixed solution and stir at 150 r / min at 60 ℃ for 40 min to obtain the composite membrane solution.

[0058] Add the prescribed amount of epichlorohydrin to the obtained composite film solution, stir at 100 r / min for 20 min, then pour into a film forming mold, control the film thickness at 0.08 mm, dry in an oven at 50 ℃ for 2 h, remove, cool to room temperature, peel off the mold, and obtain the antioxidant agricultural mulch film containing Artemisia argyi extract.

[0059] The obtained antioxidant agricultural mulch film containing Artemisia argyi extract is cut to the required size, packaged, and ready for use.

[0060] The antioxidant agricultural mulch film containing Artemisia argyi extract in Example 2 exhibits a DPPH free radical scavenging rate of 50% and a service life of up to 5.5 months under natural light conditions. In Example 2, the organic film substrate is only starch. The crosslinking agent epichlorohydrin undergoes a ring-opening addition reaction with the hydroxyl groups (-OH) in starch and the hydroxyl / phenolic hydroxyl groups in Artemisia argyi extract via epoxy groups, covalently fixing the Artemisia argyi extract to the starch molecular chains via ether bonds (-COC-), forming a stable three-dimensional crosslinking network and achieving efficient crosslinking.

[0061] Example 3 The antioxidant agricultural mulch film containing Artemisia argyi extract in Example 3 comprises the following raw materials: 80 g sodium carboxymethyl cellulose, 20 g artemisia extract, 10 g sorbitol, 5 g glutaraldehyde, 3 g vitamin E, and 20 g deionized water.

[0062] The preparation method of Artemisia argyi acid extract includes the following steps: Dried Artemisia argyi stems and leaves were pulverized and passed through a 60-mesh sieve to obtain Artemisia argyi powder. The powder was mixed with a 2 wt.% citric acid solution at a mass ratio of 1:15 and extracted at 80 °C for 4 h with stirring at 200 r / min. The mixture was then centrifuged and filtered to obtain the supernatant. The supernatant was concentrated under reduced pressure to 33% of its original volume to obtain a concentrate. The concentrate was then freeze-dried under vacuum, pulverized, and passed through a 100-mesh sieve to obtain the Artemisia argyi acid extract. The total flavonoid content of the obtained Artemisia argyi acid extract was 38.9 mg / g, and the polysaccharide content was 72.5 mg / g.

[0063] The preparation method of the antioxidant agricultural mulch film containing Artemisia argyi extract in Example 3 includes the following steps: Sodium carboxymethyl cellulose, sorbitol, and vitamin E were dried until their moisture content was less than 5%.

[0064] Add the prescribed amount of sodium carboxymethyl cellulose to deionized water, heat to 90 °C and stir at 300 r / min until completely dissolved to obtain the substrate solution.

[0065] Add the prescribed amounts of sorbitol and vitamin E to the obtained substrate solution and stir at 200 r / min for 60 min to obtain a mixed solution.

[0066] Add the prescribed amount of Artemisia argyi extract to the resulting mixed solution and stir at 250 r / min at 70 ℃ for 80 min to obtain the composite membrane solution.

[0067] Add the prescribed amount of glutaraldehyde to the obtained composite film solution, stir at 200 r / min for 30 min, then pour into a film forming mold, control the film thickness at 0.12 mm, dry in an oven at 60 ℃ for 1 h, remove, cool to room temperature, peel off the mold, and obtain the antioxidant agricultural mulch film containing Artemisia argyi extract.

[0068] The obtained antioxidant agricultural mulch film containing Artemisia argyi extract is cut to the required size, packaged, and ready for use.

[0069] The antioxidant agricultural mulch film containing Artemisia argyi extract in Example 3 exhibits a DPPH free radical scavenging rate of 60% and a service life of up to 7 months under natural light conditions. In Example 3, the organic film substrate is sodium carboxymethyl cellulose, and the crosslinking agent glutaraldehyde undergoes an acetal reaction via a dialdehyde group: one end reacts with the hydroxyl group in sodium carboxymethyl cellulose, and the other end reacts with the hydroxyl / phenolic hydroxyl groups in Artemisia argyi extract, thereby achieving molecular bridging between sodium carboxymethyl cellulose and Artemisia argyi extract and forming a stable three-dimensional covalent crosslinked network.

[0070] Comparative Example 1 The preparation method of the antioxidant agricultural mulch film of Comparative Example 1 is basically the same as that of Example 1. The difference between the preparation method of the antioxidant agricultural mulch film of Comparative Example 1 and that of Example 1 is that glutaraldehyde is not added in Comparative Example 1.

[0071] The antioxidant agricultural mulch film of Comparative Example 1 had a DPPH free radical scavenging rate of 32%, and 42% of the artemisia argyi extract was lost after 1 month. Moreover, the antioxidant agricultural mulch film of Comparative Example 1 was brittle and cracked, and its service life under natural light conditions was only 2 months.

[0072] Comparative Example 2 The conventional organic membrane in Comparative Example 1 comprises the following raw materials: 15 g chitosan, 35 g starch, 5 g glycerol and 15 g deionized water.

[0073] The preparation method of the ordinary organic membrane in Comparative Example 1 includes the following steps: Chitosan, starch, and glycerol were dried separately until the moisture content was less than 5%.

[0074] Add the prescribed amounts of chitosan and starch to deionized water, heat to 80 °C and stir at 250 r / min until completely dissolved to obtain the substrate solution.

[0075] Add the prescribed amount of glycerol to the obtained substrate solution and stir at 180 r / min for 45 min to obtain a mixed solution.

[0076] The resulting mixed solution was poured into a film-forming mold, and the film thickness was controlled at 0.1 mm. After drying in an oven at 55 ℃ for 1.5 h, the film was removed, cooled to room temperature, and the mold was peeled off to obtain a common organic film.

[0077] Cut the obtained ordinary organic film to the required size, package it, and set it aside for later use.

[0078] from Figure 1 As can be seen, the ordinary organic film of Comparative Example 2 had a much lower DPPH removal rate than the antioxidant agricultural film containing Artemisia argyi extract in Example 1 within 6 months.

[0079] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the disclosure herein. This disclosure is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the claims.

[0080] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. The scope of patent protection of the present invention shall be determined by the claims. Similarly, any equivalent structural changes made based on the content of the present invention's specification shall also be included within the scope of protection of the present invention.

Claims

1. An antioxidant agricultural mulch film containing Artemisia argyi extract, characterized in that, Including the following parts by weight of raw materials; The mixture contains 50-80 parts of organic film substrate, 5-20 parts of Artemisia argyi extract, 3-10 parts of plasticizer, 1-5 parts of crosslinking agent, 1-3 parts of stabilizer, and 10-20 parts of water.

2. The antioxidant agricultural mulch film containing Artemisia argyi extract according to claim 1, characterized in that, The crosslinking agent is glutaraldehyde or epichlorohydrin.

3. The antioxidant agricultural mulch film containing Artemisia argyi extract according to claim 1, characterized in that, The wormwood acid extract is obtained by extracting wormwood with citric acid.

4. The antioxidant agricultural mulch film containing Artemisia argyi extract according to claim 1, characterized in that, The organic membrane substrate is one or more of starch, chitosan, and sodium carboxymethyl cellulose.

5. The antioxidant agricultural mulch film containing Artemisia argyi extract according to claim 1, characterized in that, The plasticizer is one or more of glycerin, polyethylene glycol, and sorbitol.

6. The antioxidant agricultural mulch film containing Artemisia argyi extract according to claim 1, characterized in that, The stabilizer is vitamin E or tea polyphenols.

7. A method for preparing an antioxidant agricultural mulch film containing Artemisia argyi extract as described in any one of claims 1 to 6, characterized in that, Includes the following steps: Step 1: Add the prescribed amount of organic membrane substrate to water, heat and stir to obtain a substrate solution; Step 2: Add the formulated amounts of plasticizer and stabilizer to the substrate solution obtained in Step 1, stir, and obtain a mixed solution; Step 3: Add the prescribed amount of Artemisia argyi extract to the mixed solution obtained in Step 2, stir, and obtain the composite membrane solution; Step 4: Add the prescribed amount of crosslinking agent to the composite film liquid obtained in Step 3, stir, pour into a mold, and dry to obtain an antioxidant agricultural mulch film containing Artemisia argyi extract.

8. The method for preparing the antioxidant agricultural mulch film containing Artemisia argyi extract according to claim 7, characterized in that, The heating and stirring temperature in step 1 is 70–90 °C, and the stirring speed is 200–300 r / min; the stirring time in step 2 is 30–60 min, and the stirring speed is 100–200 r / min.

9. The method for preparing the antioxidant agricultural mulch film containing Artemisia argyi extract according to claim 7, characterized in that, The stirring described in step 3 is carried out at 60-70 °C for 40-80 min, and the stirring speed is 150-250 r / min.

10. The method for preparing the antioxidant agricultural mulch film containing Artemisia argyi extract according to claim 7, characterized in that, The stirring time in step 4 is 20-30 min, the stirring speed is 100-200 r / min; the drying temperature is 50-60 ℃, and the drying time is 1-2 h.

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