Aerogel compound fertilizer, biodegradable film and preparation method and application thereof

Abstract

The invention belongs to the field of macromolecules, and relates to an aerogel compound fertilizer, a biodegradable film and a preparation method and application thereof. The aerogel compound fertilizer comprises a bio-based high-molecular material carrier and a fertilizer loaded on the bio-based high-molecular material carrier, and is prepared by reacting a bio-based high-molecular material, an auxiliary agent and a water-soluble fertilizer, the bio-based high polymer material is a plant hormone; the auxiliary agent is a long-chain aliphatic compound and an N-vinyl amide polymer; based on 100 parts by weight of the aerogel compound fertilizer, the use amount of the bio-based high polymer material is 20-60 parts by weight, the use amount of the long-chain aliphatic compound is 1-10 parts by weight, the use amount of the N-vinyl amide polymer is 1-10 parts by weight, and the use amount of the water-soluble fertilizer is 10-80 parts by weight. The film prepared from the biodegradable composition disclosed by the invention has the characteristics of good mechanical property, good weather resistance, good fertilizer slow release performance, biodegradability and the like.

Description

Technical Field

[0001] This invention belongs to the field of polymers, specifically relating to an aerogel composite fertilizer and a biodegradable film, as well as their preparation methods and applications. Background Technology

[0002] Fully biodegradable mulch film is a type of agricultural plastic film that biodegrades in the natural environment through the action of light, heat, water, and microorganisms. GB / T35795-2017 specifies that fully biodegradable mulch film is prepared from biodegradable materials and used for covering farmland soil surfaces. It is a biodegradable film that warms and retains moisture while suppressing weeds. Existing research indicates that biodegradable mulch film ultimately decomposes into small molecules such as water, carbon dioxide, or methane.

[0003] Chemical fertilizers play an irreplaceable role in promoting grain and agricultural production, serving as crucial agricultural inputs. However, because the nutrients in traditional fertilizers are generally water-soluble, they are often lost before being utilized by crops, reducing fertilization efficiency and, in severe cases, causing soil compaction, eutrophication of groundwater and surface water, and seriously jeopardizing ecosystem security. Producing coated fertilizers to achieve slow release is an effective way to solve these problems. Currently, coating materials for slow / controlled-release nitrogen fertilizers mainly include superabsorbent polymers (polyacrylic acid / polyacrylamide, etc.), polymers (polyethylene, etc.), biocomposite materials (starch, etc.), and inorganic materials (gypsum, etc.). However, superabsorbent materials have complex preparation processes, high costs, and are non-biodegradable; polymer coating materials are non-degradable and pollute the environment; biocomposite materials (such as starch-based materials) have strong hydrophilicity, easily leading to fertilizer loss; and gypsum and similar materials are prone to cracking and contribute to soil acidification. The aforementioned reasons mean that while coated slow-release fertilizers have a certain slow-release effect, the release period does not match the crop's growth period. Furthermore, most coating materials are non-biodegradable in soil, forming microplastics and causing secondary pollution to the environment and water bodies. These coating materials still require manual and mechanical application. CN111165242B discloses a fertilizer-type biodegradable mulch film and its preparation method. This fertilizer-type biodegradable mulch film can provide or supplement fertilizer for crops in their growth period. After degradation, the fertilizer is released, and numerous tiny pores appear on the mulch film, facilitating its interaction with water and microorganisms in the environment, thereby accelerating degradation and reducing or eliminating mulch film residue at harvest. However, this mulch film contains coating fertilizers such as polyvinyl alcohol, chitosan, and sodium alginate, which may negatively impact the complete degradation of the mulch film. CN113717507A discloses a biodegradable mulch film for tobacco planting that can improve soil properties and its preparation method. This functional mulch film for tobacco planting not only has fully biodegradable characteristics, but also its encapsulated functional fertilizer microcapsules can release special trace elements necessary for tobacco growth in a controlled manner during the tobacco growth period, effectively supplementing the needs of tobacco growth. However, the mulch film involved in this patent contains a large amount of starch and does not contain ultraviolet absorbers, which affects the service life of the mulch film in areas with high ultraviolet radiation. Summary of the Invention

[0004] To address the aforementioned problems in the existing technology, this invention proposes an aerogel composite fertilizer and a biodegradable film, along with their preparation method and applications. The aerogel composite fertilizer of this invention uses plant hormones as the main raw material and features excellent slow-release fertilizer properties and complete biodegradability. Using a controllable biodegradable resin composition as the base resin, the aerogel composite fertilizer and corresponding additives are added to obtain a biodegradable composition. This allows for the preparation of a biodegradable film with good mechanical properties, good weather resistance, excellent slow-release fertilizer properties, and biodegradability. Furthermore, its preparation process is simple, making it an excellent material suitable for applications such as field mulch films and greenhouse mulch films.

[0005] To achieve the above-mentioned objectives of the present invention, a first aspect of the present invention provides an aerogel composite fertilizer, comprising a bio-based polymer material carrier and a fertilizer loaded on the bio-based polymer material carrier, prepared by reacting a bio-based polymer material, an additive, and a water-soluble fertilizer; wherein the bio-based polymer material is a plant hormone, preferably zeatin, 6-(4-hydroxy-3-methyl-2-butenyl)aminopurine, isopentenyl adenine, N... 6 -Benzyladenine and N 6 At least one of furanylmethyladenine; the adjuvant is a long-chain aliphatic compound and an N-vinylamide polymer;

[0006] The aerogel compound fertilizer comprises 100 parts by weight, the bio-based polymer material comprises 20-60 parts by weight, preferably 35-55 parts by weight, the long-chain aliphatic compound comprises 1-10 parts by weight, preferably 2-6 parts by weight, the N-vinylamide polymer comprises 1-10 parts by weight, preferably 3-6 parts by weight, and the water-soluble fertilizer comprises 10-80 parts by weight, preferably 30-60 parts by weight.

[0007] A second aspect of the present invention provides a biodegradable composition comprising, by weight, the following biodegradable resin composition components:

[0008] Biodegradable resin A: 35-95 parts by weight, preferably 35-75 parts by weight;

[0009] Biodegradable resin B: 4-60 parts by weight, preferably 20-60 parts by weight;

[0010] Bio-based elastomer C1 to 5 parts by weight, preferably 2 to 5 parts by weight;

[0011] Based on 100 parts by weight of the biodegradable resin composition, the biodegradable composition further comprises the following components in parts by weight:

[0012] The aerogel compound fertilizer is 5-15 parts by weight, preferably 5-10 parts by weight;

[0013] The additive is 0.01 to 12 parts by weight, preferably 0.02 to 10 parts by weight;

[0014] The additives include chain extenders, hydrolysis inhibitors, light stabilizers, and ultraviolet absorbers;

[0015] Wherein, the biodegradable resin A is a chain extender-modified aliphatic aromatic copolyester; and the biodegradable resin B is polyglycolic acid.

[0016] A third aspect of the present invention provides a biodegradable film formed from the aforementioned biodegradable composition.

[0017] A fourth aspect of the present invention provides a method for preparing the biodegradable film, comprising the following steps:

[0018] (1) Biodegradable resin A, biodegradable resin B, bio-based elastomer C, aerogel compound fertilizer and additives are mixed and extruded and granulated to obtain a biodegradable resin composition containing fertilizer.

[0019] (2) The biodegradable resin composition containing fertilizer is used to form a film to obtain the biodegradable film.

[0020] A fifth aspect of the invention provides the application of the biodegradable film in agricultural mulch films.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] (1) The aerogel compound fertilizer provided by the present invention uses plant hormones as the main raw material and has the characteristics of good fertilizer slow release performance and complete degradation.

[0023] (2) The biodegradable composition provided by the present invention uses controllable biodegradable plastic as the base resin, adds aerogel composite fertilizer and corresponding additives, and the film made therefrom has the characteristics of good slow-release performance of biodegradable fertilizer and biodegradability.

[0024] (3) The biodegradable film provided by the present invention has good mechanical properties and weather resistance, and is therefore an excellent material suitable for fields such as field mulch film and greenhouse mulch film.

[0025] (4) The biodegradable film provided by the present invention has a controllable degradation structure, can be degraded by soil burial or composting, does not cause secondary pollution, and meets the requirements of circular economy.

[0026] (5) The preparation method of the biodegradable film provided by the present invention is simple, effective and easy to operate.

[0027] Other features and advantages of the present invention will be described in detail in the following detailed description section. Detailed Implementation

[0028] The following provides a detailed description of specific embodiments of the present invention. It should be understood that the specific embodiments described herein are for illustrative and explanatory purposes only and are not intended to limit the scope of the invention.

[0029] To achieve the above-mentioned objectives of the present invention, a first aspect of the present invention provides an aerogel composite fertilizer, comprising a bio-based polymer material carrier and a fertilizer loaded on the bio-based polymer material carrier, prepared by reacting a bio-based polymer material, an additive, and a water-soluble fertilizer; wherein the bio-based polymer material is a plant hormone, preferably zeatin, 6-(4-hydroxy-3-methyl-2-butenyl)aminopurine, isopentenyl adenine, N... 6 -Benzyladenine and N 6 At least one of furanylmethyladenine; the adjuvant is a long-chain aliphatic compound and an N-vinylamide polymer;

[0030] The aerogel compound fertilizer comprises 100 parts by weight, the bio-based polymer material comprises 20-60 parts by weight, preferably 35-55 parts by weight, the long-chain aliphatic compound comprises 1-10 parts by weight, preferably 2-6 parts by weight, the N-vinylamide polymer comprises 1-10 parts by weight, preferably 3-6 parts by weight, and the water-soluble fertilizer comprises 10-80 parts by weight, preferably 30-60 parts by weight.

[0031] According to the present invention, preferably, the long-chain aliphatic compound is at least one of long-chain aliphatic metal salts, long-chain aliphatic amides, and long-chain aliphatic bases, and more preferably selected from at least one of disodium lauryl sulfosuccinate monoester, potassium monododecyl phosphate, potassium lauryl ether phosphate, cocoyl diethanolamide, cocamidopropyl betaine, lauramidopropyl betaine, cocamidopropyl hydroxysulfonyl betaine, lauramidopropyl hydroxysulfonyl betaine, lauramidopropyl hydroxysulfonyl betaine, lauramidopropyl amine oxide, sodium lauryl amphoteric acetate, and potassium fatty acid soap.

[0032] In this invention, the long chain refers to C7-C. 20 The chain segment.

[0033] Preferably, the N-vinylamide polymer is an N-vinylamide homopolymer and / or an N-vinylamide copolymer, and is preferably selected from N-vinylheptamide, N-vinyloctamide, N-vinylnonamide, N-vinyldecamide, N-methyl-N-vinylformamide, N-methyl-N-vinylacetamide, N-methyl-N-vinylpropionamide, N-methyl-N-vinylbutyramide, N-methyl-N-vinylpentamide, N-methyl-N-vinylhexamide, N-methyl-N-vinylheptamide, N-methyl-N-vinyloctamide, N-methyl-N-vinylnonamide, N-methyl-N-vinyldecamide, N-ethyl-N-vinylformamide, N-ethyl-N-vinylacetamide, N-ethyl-N-vinylpropionamide, N-ethyl-N-vinylbutyramide, N-ethyl-N-vinylpentamide, N-ethyl-N-vinylhexamide, N-ethyl-N-vinylheptamide, and N-ethyl-N-vinyloctamide. N-Ethyl-N-vinylnonamide, N-Ethyl-N-vinyldecamide, N-n-propyl-N-vinylformamide, N-n-propyl-N-vinylacetamide, N-n-propyl-N-vinylpropamide, N-n-propyl-N-vinylbutamide, N-n-propyl-N-vinylpentamide, N-n-propyl-N-vinylhexamide, N-n-propyl-N-vinylheptamide, N-n-propyl-N-vinyloctamide, N-n-propyl-N-vinylnonamide, N-n-propyl At least one of N-vinyldecylamide, N-isopropyl-N-vinylformamide, N-isopropyl-N-vinylacetamide, N-isopropyl-N-vinylpropionamide, N-isopropyl-N-vinylbutyramide, N-isopropyl-N-vinylpentamide, N-isopropyl-N-vinylhexamide, N-isopropyl-N-vinylheptamide, N-isopropyl-N-vinyloctamide, N-isopropyl-N-vinylnonamide, and N-isopropyl-N-vinyldecylamide.

[0034] Preferably, the water-soluble fertilizer is selected from at least one of nitrogen fertilizer, potassium fertilizer, phosphate fertilizer, and their compound fertilizers, and more preferably from L-homocysteine, L-4,4'-dithiobis(2-aminobutyric acid), DL-homocysteine, DL-4,4'-dithiobis(2-aminobutyric acid), L-2-aminobutyric acid, D-2-aminobutyric acid, DL-2-aminobutyric acid, 2-aminobutyric acid, urea, polyglutamic acid methyl ester, polyglutamic acid butyl ester, polyglutamic acid ethyl ester, potassium hexadecyl phosphate, potassium dihydrogen phosphate, and tetrabutyl phosphate. At least one of the following: ammonium hydrogen, potassium nitrate, potassium nitrite, polyaspartic acid, indoleacetic acid, indoleacetic acid ester, 2-methyl-3-indoleacetic acid, 2-indoleacetic acid, potassium 3-indoleacetic acid, N-methyl-3-indoleacetic acid, 5-methoxy-2-methyl-3-indoleacetic acid, 2-methyl-3-indoleacetic acid, 1-methyl-3-indoleacetic acid, 3-amino-1,4-dimethyl-5H-pyridine[4,3-B]indoleacetic acid, monoammonium phosphate, polyammonium phosphate, diammonium phosphate, and potassium humate.

[0035] According to the present invention, preferably, the preparation method of the aerogel compound fertilizer includes the following steps:

[0036] Under stirring conditions, bio-based polymer materials, additives, and water-soluble fertilizers are added to deionized water for mixing and reaction to obtain a suspension. An organic acid solution is added, and the mixture is ultrasonically dispersed and stirred evenly. The mixture is allowed to stand to degas until the solution is clear, and then frozen and dried to obtain the aerogel composite fertilizer.

[0037] Preferably, the organic acid solution is selected from formic acid solution and / or acetic acid solution.

[0038] Preferably, the freezing temperature is -40℃ to -10℃ and the time is 10-15h; the drying is carried out under vacuum conditions at a temperature of -120℃ to -80℃ for 20-30h.

[0039] A second aspect of the present invention provides a biodegradable composition comprising, by weight, the following biodegradable resin composition components:

[0040] Biodegradable resin A: 35-95 parts by weight, preferably 35-75 parts by weight;

[0041] Biodegradable resin B: 4-60 parts by weight, preferably 20-60 parts by weight;

[0042] Bio-based elastomer C1 to 5 parts by weight, preferably 2 to 5 parts by weight;

[0043] Based on 100 parts by weight of the biodegradable resin composition, the biodegradable composition further comprises the following components in parts by weight:

[0044] The aerogel compound fertilizer is 5-15 parts by weight, preferably 5-10 parts by weight;

[0045] The additive is 0.01 to 12 parts by weight, preferably 0.02 to 10 parts by weight;

[0046] The additives include chain extenders, hydrolysis inhibitors, light stabilizers, and ultraviolet absorbers;

[0047] Wherein, the biodegradable resin A is a chain extender-modified aliphatic aromatic copolyester; and the biodegradable resin B is polyglycolic acid.

[0048] According to the present invention, preferably, based on 100 parts by weight of the biodegradable resin composition components, the chain extender content is 0.01 to 0.5 parts by weight, more preferably 0.1 to 0.25 parts by weight; the hydrolysis inhibitor content is 0.1 to 1 part by weight, more preferably 0.5 to 1 part by weight; the light stabilizer content is 0.01 to 0.5 parts by weight, more preferably 0.4 to 0.5 parts by weight; and the ultraviolet absorber content is 0.01 to 0.5 parts by weight, more preferably 0.3 to 0.5 parts by weight.

[0049] According to the present invention, preferably, the additive further comprises at least one of the following components, in 100 parts by weight of the biodegradable resin composition components:

[0050] The slip agent is used in amounts of 0.05 to 5 parts by weight, preferably 0.1 to 0.3 parts by weight;

[0051] The antioxidant is used in an amount of 0.01 to 0.5 parts by weight, preferably 0.1 to 0.5 parts by weight;

[0052] The nucleating agent is used in amounts of 0.01 to 0.5 parts by weight, preferably 0.05 to 0.2 parts by weight.

[0053] According to the present invention, preferably, the melt index of the biodegradable resin A at 190°C and 2.16 kg load is 0.1-10 g / 10 min.

[0054] Preferably, the modified fatty aromatic copolyester is prepared by modifying a fatty aromatic copolyester with a chain extender; the amount of the chain extender is 0.02-3 wt% of the amount of the fatty aromatic copolyester, preferably 0.03-1.5 wt%.

[0055] In this invention, the modified fatty aromatic copolyester is obtained by extruding a fatty aromatic copolyester with a chain extender.

[0056] In this invention, the biodegradable resin A can be obtained commercially or in-house.

[0057] According to the present invention, preferably, the fatty aromatic copolyester is obtained by esterification of monomers b, c, and d, and optionally monomer a, in the presence of a catalyst.

[0058] In this invention, the fatty aromatic copolyester is prepared by mixing monomers a, b, c, and d under the action of a catalyst for esterification reaction, or by mixing the esterification products of monomers a and b and the esterification products of monomers c and d for co-condensation reaction, thereby obtaining the fatty aromatic copolyester.

[0059] Preferably, monomer a is an aromatic dicarboxylic acid and / or its ester derivative, preferably terephthalic acid and / or dimethyl terephthalate.

[0060] Preferably, the monomer b is C2-C 10 Aliphatic diols and / or C3-C 10 Alicyclic diols, preferably 1,3-propanediol and / or 1,4-butanediol.

[0061] Preferably, the monomer c is C4-C. 20 Aliphatic dicarboxylic acids and / or their ester derivatives, preferably selected from at least one of succinic acid, dimethyl succinate, adipic acid, or dimethyl adipic acid and furanyl dicarboxylic acid.

[0062] Preferably, the monomer d is at least one of a polyol with a functionality greater than 2, a polycarboxylic acid with a functionality greater than 2, and an anhydride with a functionality greater than 2, and more preferably selected from at least one of pyromellitic dianhydride, glycerol, and pentaerythritol.

[0063] As long as a long-branched biodegradable resin with a corresponding melt index can be obtained, the content of each monomer can be used in conventional amounts. Preferably, the amounts of monomer a, monomer b, monomer c and monomer d satisfy the following: the molar ratio of (a+c):b is 1:(1~2.8), the molar ratio of (a+c):d is (150~1800):1, and the molar ratio of a:c is 0:100~80:20, preferably 0.01:99.99~60:40.

[0064] For example, fatty aromatic copolyesters can be polybutylene terephthalate, polybutylene adipate, polybutylene succinate-butylene adipate copolymer, poly(butylene adipate-co-butylene-2,5-furandicarboxylate), poly(butylene succinate-co-butylene-2,5-furandicarboxylate), and polybutylene succinate-polylactic acid.

[0065] According to the present invention, preferably, the catalyst is selected from at least one of a first catalyst, a second catalyst, and a third catalyst.

[0066] Preferably, the first catalyst is selected from at least one of oxides of M, M(OR1)n, and M(OOCR2)m, wherein M is titanium, antimony, or zinc, n and m are each independently the valence state of M, and R1 is C1-C. 10 Alkyl group, R2 is C1-C 20 The first catalyst is selected from at least one of alkoxytitanium, antimony acetate, zinc acetate, oxides of zinc, oxides of antimony and oxides of titanium, and more preferably from at least one of tetrabutyl titanate, isopropoxytitanium, titanium dioxide, antimony trioxide, antimony acetate and zinc acetate.

[0067] Preferably, the second catalyst may be a compound of RE(R3)3, wherein RE is a rare earth metal element, R3 is selected from at least one of halogen, alkoxy, aryloxy, acetylacetonate, and R4COO- group, and R4 is C1-C2. 30 The alkyl group; preferably, RE is selected from at least one of lanthanum, cerium, praseodymium, neodymium, terbium, ytterbium, dysprosium, samarium, or scandium; the halogen may be chlorine or bromine, the alkoxy group may be a C3-C6 alkoxy group, the aryloxy group may be an aryloxy group including at least one benzene ring and / or a naphthyl ring, and R4 is a C1-C6 alkoxy group. 20 The alkyl group; more preferably, RE is selected from lanthanum, cerium, praseodymium, neodymium, or scandium, the halogen is chlorine or bromine, the alkyl group in the alkoxy group is at least one of isopropyl, n-butyl, or isopentyl, the aryl group in the aryloxy group is at least one of 2,6-di-tert-butyl-4-methylphenyl or 4-butylphenyl, and R4 is C3-C4. 18 At least one of the alkyl groups; more preferably, the second catalyst may be at least one of lanthanum acetylacetonate, neodymium acetylacetonate, neodymium isopropoxy, lanthanum isopropoxy, scandium isopropoxy, lanthanum stearate, neodymium stearate, lanthanum chloride, tris(2,6-di-tert-butyl-4-methylphenoxy)lanthanum and their hydrates.

[0068] Preferably, the third catalyst is an organotin compound, preferably selected from at least one of dibutyltin oxide, methylphenyltin oxide, tetraethyltin, hexaethyltin oxide, hexacyclohexylditin oxide, di(dodecyl)tin oxide, triethylhydroxytin, triphenylhydroxytin, triisobutyltin acetate, dibutyltin diacetate, diphenyltin dilaurate, monobutyltin trichloride, tributyltin chloride, dibutyltin sulfide, butyltin hydroxyoxide, methylstannic acid, ethylstannic acid, and butylstannic acid; more preferably selected from at least two of dibutyltin oxide, tetraethyltin, triphenylhydroxytin, dibutyltin diacetate, diphenyltin dilaurate, monobutyltin trichloride, tributyltin chloride, dibutyltin sulfide, butyltin hydroxyoxide, methylstannic acid, ethylstannic acid, and butylstannic acid; the content of each component in the third catalyst is 10-90 mol%, preferably 30-70 mol%.

[0069] Preferably, the catalyst is a mixture of a first catalyst, a second catalyst and a third catalyst, wherein the molar ratio of the first catalyst to the second catalyst to the third catalyst is (0.1-20):(0.1-15):1, preferably (0.1-10):(0.1-10):1.

[0070] Preferably, the total amount of catalyst used is in a molar ratio of 1:(1000-20000) to monomer (a+c), more preferably 1:(1000-10000).

[0071] According to the present invention, preferably, the polyglycolic acid is homopolymer polyglycolic acid and / or copolymer polyglycolic acid.

[0072] Preferably, the comonomer of the copolymerized polyglycolic acid is at least one selected from cyclic monomers, lactones, carbonates, ethers, ether esters, amides, hydroxycarboxylic acids, alkyl hydroxy acids, aliphatic diols, aliphatic dicarboxylic acids, and esters of aliphatic diols and aliphatic dicarboxylic acids.

[0073] More preferably, the cyclic monomer is 1,4-dioxane-2,3-dione and / or lactide; the lactone is preferably at least one selected from p-propiolactone, p-butyrolactone, p-neopentrolactone, p-butyrolactone, δ-valactone, p-ethylδ-valactone, and ε-caprolactone; the carbonate is trimethylene carbonate; the ether is 1,3-dioxane, and the ether ester is dioxane; the amide is ε-caprolactam; the hydroxycarboxylic acid is at least one selected from lactic acid, 3-hydroxypropionic acid, 3-hydroxybutyric acid, 4-hydroxybutyric acid, and 6-hydroxyhexanoic acid; the aliphatic diol is ethylene glycol and / or 1,4-butanediol; and the aliphatic dicarboxylic acid is succinic acid and / or adipic acid.

[0074] More preferably, the copolymerized polyglycolic acid is at least one selected from polyglycolic acid-lactide (PGLA), polyglycolic acid-caprolactone (PGCA), polyglycolic acid-lactide-caprolactone, and polyglycolic acid-trimethylene carbonate.

[0075] More preferably, in the copolymerized polyglycolic acid, glycolic acid monomer accounts for more than 80 mol% of the total monomer content, and more preferably more than 90 mol%.

[0076] According to the present invention, preferably, the bio-based elastomer C is selected from at least one of poly(saccharide-glycerol) elastomer, acrylated poly(saccharide-glycerol) elastomer, poly(citric acid-1,8-octanediol) elastomer, lactide-caprolactone copolymer, glycolide-lactide copolymer, glycolide-lactide-caprolactone terpolymer, poly(ester-carbonate) elastomer, poly(citric acid-octanediol-saccharide) elastomer, poly(saccharide-glycerol-citric acid) elastomer, poly(saccharide-1,2-propanediol-citric acid) elastomer, poly(itaconate-isoprene-glycidyl methacrylate) elastomer, soybean oil-based elastomer, itacate elastomer containing a ternary epoxy structure, and myrcene-based bio-based elastomer.

[0077] According to the present invention, preferably, the chain extender in the additive and the chain extender in the biodegradable resin A are each independently at least one of the following: organic peroxide, condensation polymer of aromatic olefin monomers and / or acrylic monomers and epoxy functional monomers, a complex of the condensation polymer and anhydride polyfunctional monomers, and a complex of the epoxy functional monomer and anhydride polyfunctional monomers.

[0078] Preferably, the organic peroxide is selected from organic peroxides with a half-life of 0.1 to 5 min within the processing temperature range, and more preferably, organic peroxides with a half-life of 0.1 to 1.5 min; more preferably, the organic peroxide is selected from at least one of peroxide esters, aliphatic peroxides, and aromatic peroxides, and more preferably from tert-butyl peroxyheptanate, tert-butyl peroxyhexanoate, cumyl peroxyheptanate, tert-pentyl peroxyheptanate, tert-butyl peroxyhexanoate, tert-butyl peroxyhexanoate, 1-dimethyl-3-hydroxybutyl peroxide, tert-pentyl peroxybenzoate, tert-butyl peroxyhexanoate, tert-pentyl peroxyhexanoate, 1-dimethyl-3-hydroxybutyl peroxide, tert-pentyl peroxybenzoate, tert-butyl peroxyhexanoate, tert-pentyl peroxyhexanoate, bis-tert-butyl peroxyhexanoate, triallyl isocyanurate, 2,5-dimethyl-2,5- At least one of the following: di(benzoylperoxy)hexane, 2,5-dimethyl-2,5-di(butylperoxy)-3-hexyne, 2,5-bis(tert-butylperoxy)-2,5-dimethylhexane, n-butyl-4,4-bis(tert-butylperoxy)valerate, 1,4-bis(tert-butylperoxyisopropyl)benzene, tert-butylperoxybenzoate, 1,1-bis(tert-butylperoxy)-3,3,5-trimethylcyclohexane, and di(2,4-dichlorobenzoyl), dibenzoylperoxide, dicumyl peroxide, aliphatic diacetylperoxide, ditert-butylperoxide, and dicumyl peroxide, more preferably n-butyl-4,4-bis(tert-butylperoxy)valerate and / or 1,1-bis(tert-butylperoxy)-3,3,5-trimethylcyclohexane.

[0079] Preferably, the aromatic olefin monomer is styrene and / or 1-methylstyrene.

[0080] Preferably, the epoxy functional monomer is selected from at least one of glycidyl methacrylate, triglycidyl isocyanurate, glycerol triglycidyl ether, trimethylolpropane triglycidyl ether, triglycidyl p-aminophenol, N,N,N',N'-tetraglycidyl-4,4'-diaminodiphenylmethane, pyromellitic phloroglucinol triglycidyl ether, pyromellitic tetraglycidyl ether, 1,1',2,2'-tetra(p-hydroxyphenyl)ethane tetraglycidyl ether, resorcinol formaldehyde tetraglycidyl ether, bisresorcinol formaldehyde tetraglycidyl ether, and glycidyl methacrylate oligomers.

[0081] Preferably, the acrylic monomer is selected from at least one of acrylic acid, methacrylic acid, acrylonitrile, methyl acrylate, ethyl acrylate, butyl acrylate, methyl methacrylate, ethyl methacrylate, and butyl methacrylate.

[0082] Preferably, the anhydride-based multifunctional monomer is selected from at least one of pyromellitic dianhydride, 3,3',4,4'-benzophenone tetracarboxylic dianhydride, 3,3',4,4'-biphenyltetracarboxylic dianhydride, glycerol trimellitic anhydride, cyclobutanetetracarboxylic dianhydride, cyclopentanetetracarboxylic dianhydride, ethylenetetracarboxylic dianhydride, and 1,2,3,4-butanetetracarboxylic dianhydride, and is more preferably pyromellitic dianhydride and / or cyclobutanetetracarboxylic dianhydride.

[0083] Preferably, the condensation polymer is at least one selected from the following: methyl methacrylate, butyl methacrylate, styrene, a copolymer of 1-methylstyrene and glycidyl 2-methyl-2-acrylate, a copolymer of acrylonitrile and glycidyl methacrylate, a copolymer of isobutyl acrylate and methyl methacrylate, a copolymer of ethyl acrylate and butyl acrylate, a copolymer of acrylonitrile and glycidyl methacrylate, and a copolymer of methacrylate and glycidyl methacrylate.

[0084] According to a preferred embodiment of the present invention, the chain extender in the additive and the chain extender in the biodegradable resin A are each independently a compound of the condensation polymer and the acid anhydride polyfunctional monomer. The compound of the condensation polymer and the acid anhydride polyfunctional monomer can further improve the chain extension effect and processing performance. The molar ratio of the compound of the condensation polymer and the acid anhydride polyfunctional monomer is 1-10:1, preferably 2-5:1.

[0085] According to another preferred embodiment of the present invention, the chain extender in the additive and the chain extender in the biodegradable resin A are each independently a compound of the epoxy functional monomer and the acid anhydride polyfunctional monomer, and the compound molar ratio of the epoxy functional monomer to the acid anhydride polyfunctional monomer is 1-10:1, preferably 2-5:1.

[0086] More preferably, the chain extender in the additive and the chain extender in the biodegradable resin A are each independently a compound of the condensation polymer and the acid anhydride polyfunctional monomer, and the molar ratio of the condensation polymer to the acid anhydride polyfunctional monomer is 1-10:1, preferably 2-5:1.

[0087] According to the present invention, preferably, the hydrolysis inhibitor is selected from polycarbodiimide, monomeric carbodimethylamine, dicyclohexylcarbodiimide, N,N'-diisopropylcarbodiimide, 2,2',6,6'-tetraisopropylcarbodimethylamine, 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride, 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride, 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride, 1-ethyl-(3-dimethylaminopropyl)carbodiimide hydrochloride, and 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide salt. The salt, 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride, 1-ethyl-3-(3-dimethylaminopropyl)carboammonium, 1-(3-dimethylaminopropyl)-3-ethyl-carbodiimide hydrochloride, 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride, 1-ethyl-(3-dimethylaminopropyl)carbodiimide hydrochloride, 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride, and at least one of N-(3-dimethylaminopropyl)-N'-ethyl-carbodiimide hydrochloride and (3-dimethylaminopropyl)-3-ethylcarbodiamine.

[0088] According to the present invention, preferably, the light stabilizer is selected from poly(4-hydroxy-2,2,6,6-tetramethyl-1-piperidinol) ester, bis(1-octoxy-2,2,6,6-tetramethyl-4-piperidinyl) sebacate, bis(1,2,2,6,6-pentamethylpiperidinol) sebacate, 1-(methyl)-8-(1,2,2,6,6-pentamethyl-4-piperidinyl) sebacate, bis(2,2,6,6-tetramethyl-4-piperidinyl) sebacate, poly{[6-[(1,1,3,3-tetramethylbutyl)amino]]-1,3,5-triazine-2,4-[(2,2,6,6,-tetramethyl-piperidinyl)imino]-1,6-hexane At least one of di(2,2,6,6-tetramethyl-4-piperidinyl)imino]} and N,N””-1,2-ethylenedimethyldi[N-[3-[[4,6-di[butyl(1,2,2,6,6-pentamethyl-4-piperidinyl)amino]-1,3,5-triazin-2-yl]amino]propyl]-N,N””-dibutyl-N,N””-di(1,2,2,6,6-pentamethyl-4-piperidinyl)-1,3,5-triazin-2,4,6-triamine], preferably poly(4-hydroxy-2,2,6,6-tetramethyl-1-piperidinylethanol) ester, bis(1-octyloxy-2,2,6,6-tetramethyl-4-piperidinyl) sebacate, poly{ At least one of [6-[(1,1,3,3-tetramethylbutyl)amino]]-1,3,5-triazine-2,4-[(2,2,6,6,-tetramethyl-piperidinyl)imino]-1,6-hexamethylene[(2,2,6,6-tetramethyl-4-piperidinyl)imino]} and N,N”'-1,2-ethylenedimethyldi[N-[3-[[4,6-di[butyl(1,2,2,6,6-pentamethyl-4-piperidinyl)amino]-1,3,5-triazine-2-yl]amino]propyl]-N,N”-dibutyl-N,N”-di(1,2,2,6,6-pentamethyl-4-piperidinyl)-1,3,5-triazine-2,4,6-triamine, more Preferably, it is poly{[6-[(1,1,3,3-tetramethylbutyl)amino]]-1,3,5-triazine-2,4-[(2,2,6,6,-tetramethyl-piperidinyl)imino]-1,6-hexamethylene[(2,2,6,6-tetramethyl-4-piperidinyl)imino]} and / or N,N”’-1,2-ethylenedimethyldi[N-[3-[[4,6-di[butyl(1,2,2,6,6-pentamethyl-4-piperidinyl)amino]-1,3,5-triazine-2-yl]amino]propyl]-N,N”-dibutyl-N,N”-di(1,2,2,6,6-pentamethyl-4-piperidinyl)-1,3,5-triazine-2,4,6-triamine].

[0089] According to the present invention, preferably, the ultraviolet absorber is selected from 2-(2-hydroxy-3,5-di-tert-butylphenyl)-5-chlorobenzotriazole, 2-(2-hydroxy-5-methylphenyl)benzotriazole, 2-(2'-hydroxy-3'-tert-butyl-5'-methylphenyl)-5-chlorobenzotriazole, 2-(2'-hydroxy-3',5'-dipentylphenyl)benzotriazole, 2-(2'-hydroxy-3',5'-di-tert-pentylphenyl)benzotriazole, 2,4-dihydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-n-octyloxybenzophenone, phenyl benzoate, resorcinol monobenzoate, o-nitroaniline, p-cresol, 2,4,6-tris(2-hydroxy-4-n-butoxyphenyl)-1,3,5-triazine, 2 At least one of cyano-3,3-diphenylacrylate 2-ethylhexyl ester, p-tert-butylphenyl salicylate, bisphenol A bis(3,5-di-tert-butyl-4-hydroxybenzylphosphonic acid monoethyl ester), 2,2'-thiobis(4-tert-octylphenoloxy)nickel, 2-(4,6-diphenyl-1,3,5-triazin-2-yl)-5-hexyloxy-phenol and 2-(4,6-bis(2,4-dimethylphenyl)-1,3,5-triazin-2-yl)-5-octyloxyphenol, preferably selected from at least one of 2-(2'-hydroxy-3'-tert-butyl-5'-methylphenyl)-5-chlorobenzotriazole, 2-hydroxy-4-n-octyloxybenzophenone and 2-(4,6-diphenyl-1,3,5-triazin-2-yl)-5-hexyloxy-phenol.

[0090] According to the present invention, preferably, the slip agent is a stearate and / or an organic carboxylic acid amide; preferably, the stearate is calcium stearate, and the organic carboxylic acid amide is selected from at least one of erucamide, oleamide, stearyl stearamide and N,N'-ethylene bis-stearamide, preferably N,N'-ethylene bis-stearamide.

[0091] According to the present invention, preferably, the biodegradable blown film material may further comprise a nucleating agent; the nucleating agent is an acylhydrazine compound, preferably selected from pyridine-4-carboxylhydrazine, 4,4'-oxobisbenzenesulfonylhydrazine, carbamoylhydrazine, benzenesulfonylhydrazine, maleic hydrazine, sebacic acid diacylhydrazine, cyanoacetylhydrazine, 2-amino-3-hydroxy-2'-(2,3,4-trihydroxybenzyl)propionylhydrazine, oxalylhydrazine, pyrazine-2-carboxylhydrazine, 2-hydroxybenzoylhydrazine, 4-hydroxy-2'-(5-nitrofuranmethylidene)-benzoylhydrazine, oxaloyl dihydrazine, succinic acid-N,N-dimethyl acylhydrazine, thiophene-2-carboxylic acid hydrazine, 3,5-dinitrobenzoylhydrazine, p-methoxybenzoylhydrazine, 2 - Furanoyl hydrazide, 4-aminophthalic acid hydrazide, 4-nitrophthalic acid hydrazide, 3-nitrophthalic acid hydrazide, dodecanedicarboxylic acid hydrazide, malonyl hydrazide, ethoxycarboxylic acid hydrazide, pyridine-2,6-dicarboxylic acid hydrazide, p-aminobenzoyl hydrazide, N-tert-butyl-N'-(4-ethylbenzoyl)-3,5-dimethylbenzoyl hydrazide, 4-(N-ethyl-N-aminobutylamino)phthalic acid hydrazide, tetrahydro-3-furanoyl hydrazide, tartrate hydrazide, 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl hydrazide, p-tert-butylbenzoyl hydrazide, 2,2-dimethylpropionyl hydrazide, 2-ethoxybenzoyl hydrazide, 2-hydroxy-3,5-dinitro- 2'-(5-nitrofuranmethylidene)-benzoylhydrazine, m-toluylhydrazine, o-toluylhydrazine, 4-amino-2-hydroxybenzoylhydrazine, tert-butoxycarbonylglycine hydrazine, lauroylhydrazine, p-hydroxybenzoylhydrazine, octanoylhydrazine, nicotinic hydrazine, bis[(phenylmethylene)acylhydrazine]oxalic acid, dodecanoic acid bis[2-(2-hydroxybenzoyl)acylhydrazine], methylpyridinylhydrazine, diphenylazocarbonylhydrazine, p-dimethylaminobenzoylhydrazine, phenylcarbamoylhydrazine, 3,4,5-trimethoxybenzoylhydrazine, 1,2-dimethyl-1,2-diphenylcarbamoylhydrazine, malonic acid-1,3-bis[2-methyl-2-(phenylthionylmethyl)acylhydrazine], (3R)-1-(2-methyl At least one of the following: alanyl-D-tryptophanyl)-3-benzyl-3-piperidine 1,2,2-trimethylformylhydrazine, 4-benzyloxybenzoylhydrazine, 3,5-dihydroxybenzoylhydrazine, 3,4-dimethoxyphenylacetylhydrazine, 3-methyl-4-nitrobenzene-1-carbonylhydrazine, 3-benzyloxybenzoylhydrazine, 3-phenoxybenzoylhydrazine, 3,4-diaminobenzoylhydrazine, 3-aminobenzoylhydrazine, 3-methoxybenzoylhydrazine, 3-nitrobenzoylhydrazine, 3-ethoxybenzoylhydrazine, p-toluenecarboxylhydrazine, 2,4-dihydroxybenzoylhydrazine, methoxyfenozide, benzo[b]thiophene-2-carboxylhydrazine, phenylacetylhydrazine, diphenyldihydrazine adipic acid, diphenyldihydrazine sebacate, and zinc phenyl phosphate.

[0092] In this invention, the antioxidant can be any antioxidant conventionally used in the art. For example, the antioxidant is a hindered phenolic antioxidant and / or a phosphite antioxidant, wherein the hindered phenolic antioxidant is selected from 2,6-di-tert-butyl-4-methylphenol, 1,1,3-tris(2-methyl-4-hydroxy-5-tert-butylphenyl)butane, pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], 2,2'-methylenebis(4-methyl-6-tert-butylphenol), 4,4 '-Thiobis-[3-methyl-6-tert-butylphenol], 2,2'-Thiobis-[4-methyl-6-tert-butylphenol], 1,3,5-Di[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl]-hexahydrotriazine, tris(3,5-di-tert-butyl-4-hydroxybenzyl)-triisocyanate, N,N'-di(β-naphthyl)-p-phenylenediamine, N,N'-diphenyl-p-phenylenediamine, N-benzyl Among the following substances: N'-cyclohexyl-p-phenylenediamine, dilaurate thiodipropionate, 2-mercaptobenzimidazole, 2-mercaptobenzothiazole, 1,3,5-tris(3,5-di-tert-butyl-4-hydroxybenzyl)isocyanuric acid, triethylene glycol bis[β-(3-tert-butyl-4-hydroxy-5-methylphenyl)propionate], and 1,3,5-trimethyl-2,4,6-tris(3,5-tert-butyl-4-hydroxybenzyl)benzene At least one of the following: the phosphite antioxidant is selected from at least one of the following: triphenyl phosphite, trinonylphenyl phosphite, triethylene glycol bis[β-(3-tert-butyl-4-hydroxy-5-methylphenyl)propionate], bis(2,4-dicumylphenyl) pentaerythritol-diphosphite, pentaerythritol dioctadecyl phosphite, dibutylhydroxytoluene (BHT), tert-butylhydroquinone (TBHQ), antioxidant Chinox 20N, tris(2,4-di-tert-butylphenyl) phosphite, pentaerythritol distearate diphosphite, and antioxidant 2,2'-ethylidene di(4,6-di-tert-butylphenyl)fluorophosphite; preferably, the antioxidant is a mixture of hindered phenolic antioxidants and phosphite antioxidants in a mass ratio of 1:3 to 3:1.

[0093] In this invention, the hindered phenolic antioxidant is selected from antioxidant 1010 (pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate; CAS No.: 6683-19-8), antioxidant 3114 (1,3,5-tris(3,5-di-tert-butyl-4-hydroxybenzyl)isocyanuric acid; CAS: 27676-62-6), antioxidant 245 (triethylene glycol bis[β-(3-tert-butyl-4-hydroxy-5-methylphenyl)propionate]), and antioxidant 330 (1,3,5-trimethyl-2,4,6-tris(3,5-tert-butyl-4-hydroxyphenyl)propionate). At least one of benzylbenzene; CAS: 1709-70-2; the phosphite antioxidant is selected from at least one of antioxidant 168 (tris[2,4-di-tert-butylphenyl]phosphite; CAS: 31570-04-4), antioxidant 618 (pentaerythritol distearate diphosphite; CAS: 3806-34-6), bis(2,4-dicumylphenyl)pentaerythritol-diphosphite, pentaerythritol dioctadecyl diphosphite, and antioxidant 2,2'-ethylidene di(4,6-di-tert-butylphenyl)fluorophosphite, CAS: 118337-09-0.

[0094] A third aspect of the present invention provides a biodegradable film formed from the aforementioned biodegradable composition.

[0095] According to the present invention, preferably, the thickness of the biodegradable film is 5-100 μm, more preferably 4-20 μm, the tensile breaking stress is greater than 18 MPa, more preferably 25-100 MPa, the longitudinal tensile strength is 18 MPa or more, more preferably 24 MPa or more, the transverse tensile strength is 16 MPa or more, more preferably 20 MPa or more, the longitudinal breaking nominal strain is 250% or more, more preferably 300% or more, the transverse breaking nominal strain is 300% or more, more preferably 350% or more, and the light transmittance is 89% or more.

[0096] The films prepared using the biodegradable film materials described in this method have advantages such as biocontrollable degradation, good weather resistance, and the ability to participate in fertilizer components after biodegradation, which helps to improve the fertilizer content of mulched farmland. They can be applied to agricultural mulch films and other applications where there are high requirements for the biodegradability of plastic products and the fertility of degradation products.

[0097] A fourth aspect of the present invention provides a method for preparing the biodegradable film, comprising the following steps:

[0098] (1) Biodegradable resin A, biodegradable resin B, bio-based elastomer C, aerogel compound fertilizer and additives are mixed and extruded and granulated to obtain a biodegradable resin composition containing fertilizer.

[0099] (2) The biodegradable resin composition containing fertilizer is used to form a film to obtain the biodegradable film.

[0100] According to the present invention, preferably, in step (1), the extrusion conditions include: a temperature of 50 to 200°C and a screw speed of 50 to 300 rpm, preferably 100 to 200 rpm.

[0101] According to the present invention, the conditions for extrusion granulation include: the temperature of the 7-segment temperature-controlled twin-screw extruder from the feed port to the die is 50, 100, 150, 200, 230, 230, 200℃; and the screw speed is 50-300 rpm, preferably 100-200 rpm.

[0102] In this invention, the extrusion granulation can be carried out in conventional equipment in the art, such as a twin-screw extruder. In particular, the extruder thread block assembly does not contain reverse extrusion thread blocks or high-shear thread blocks.

[0103] In this invention, the extrusion temperature refers to the extrusion temperature set in the extrusion equipment, such as a twin-screw extruder.

[0104] In this invention, the granulation method of the composition is air-cooled pelletizing or underwater pelletizing. In air-cooled pelletizing, the length of the air-cooling unit is proportional to the extrusion rate; for example, when the output is 25 kg / h, the unit length is 8 meters. In underwater pelletizing, the moisture content of the composition particles obtained by spin-drying should be less than 100 ppm.

[0105] According to the present invention, preferably, in step (2), the method of film formation is blow molding.

[0106] Preferably, the blow molding conditions include: a blown film temperature of 150-210℃, more preferably 160-200℃, and a blow-up ratio of 1.5-3:1, more preferably 2-2.5:1.

[0107] In this invention, the blown film temperature refers to the film outlet temperature of the blown film equipment, such as a blown film machine. In this invention, the blown film machine can be a conventional blown film machine in the art, such as a bottom-blowing water-cooled blown film machine, a horizontal-blowing air-cooled blown film machine, or a traditional top-blowing air-cooled biodegradable resin blown film unit.

[0108] More preferably, the tensile breaking stress of the biodegradable film in the blown film direction and perpendicular to the blown film direction is greater than 18 MPa, preferably 25-100 MPa.

[0109] According to the present invention, the thickness of the film can be adjusted according to requirements and specific processes. Preferably, the thickness of the film can be 5–100 μm, and more preferably 4–20 μm.

[0110] The tensile breaking stress of the film in the blown film direction (longitudinal MD) and perpendicular to the blown film direction (transverse TD) is greater than 18 MPa, preferably greater than 25 MPa, for example, it can be 25-100 MPa.

[0111] Preferably, the biodegradable blown film has a longitudinal tensile strength of 18 MPa or more and a transverse tensile strength of 16 MPa or more; more preferably, the longitudinal tensile strength is 24 MPa or more and the transverse tensile strength is 20 MPa or more.

[0112] Preferably, the nominal strain at longitudinal breakage of the biodegradable blown film is 250% or more, and the nominal strain at transverse breakage is 300% or more; more preferably, the nominal strain at longitudinal breakage is 300% or more, and the nominal strain at transverse breakage is 350% or more.

[0113] According to the national standard GB16422, the nominal strain residual after aging is required to be 50% or more for longitudinal fracture and 50% or more for transverse fracture.

[0114] Preferably, the light transmittance of the biodegradable resin blown film is 89% or higher.

[0115] A fifth aspect of the invention provides the application of the biodegradable film in agricultural mulch films.

[0116] The present invention will be further described below with reference to embodiments, but the scope of the present invention is not limited to these embodiments. In the following embodiments,

[0117] Biodegradable resin B:

[0118] Homopolymer polyglycolic acid: B1, PGA, Pujing Chemical;

[0119] Copolymerized polyglycolic acid:

[0120] B2: Poly(glycolic acid-lactide) (PGLA), weight-average molecular weight 7.6 × 10⁻⁶ 4 Beijing Research Institute of Chemical Industry;

[0121] B3: Poly(glycolic acid-caprolactone) (PGCA), weight-average molecular weight 7.3 × 10⁻⁶ 4 Beijing Research Institute of Chemical Industry;

[0122] B4: Poly(glycolic acid-lactide-caprolactone), weight-average molecular weight 8.5 × 10⁻⁶ 4 Beijing Research Institute of Chemical Industry

[0123] B5: Poly(glycolic acid)-trimethylene carbonate, weight average molecular weight 9.6 × 10⁻⁶ 4 Beijing Research Institute of Chemical Industry

[0124] Bio-based elastomer C:

[0125] Bio-based elastomer C1: Poly(Citrate-Octanyl Glycol-Sebacic Acid) Elastomer;

[0126] Bio-based elastomer C2: Poly(1,2-propanediol sebacate-citric acid) ester elastomer;

[0127] Bio-based elastomer C3: Poly(1,8-octanediol citrate) elastomer;

[0128] Hydrolysis inhibitor R1: 2,2',6,6'-tetraisopropyldiphenylcarbodiimide;

[0129] Hydrolysis inhibitor R2: N-(3-dimethylaminopropyl)-N'-ethyl-carbodiimide hydrochloride;

[0130] Hydrolysis inhibitor R3: polycarbodiimide;

[0131] S1: Erucamide;

[0132] S2: N,N'-Ethylene bis-stearamide;

[0133] Light stabilizer W1: {[6-[(1,1,3,3-tetramethylbutyl)amino]]-1,3,5-triazine-2,4-[(2,2,6,6-tetramethyl-piperidinyl)imino]-1,6-hexamethylene[(2,2,6,6-tetramethyl-4-piperidinyl)imino]};

[0134] Light stabilizer W2: N,N”'-1,2-ethylenedimethylbis[N-[3-[[4,6-bis[butyl(1,2,2,6,6-pentamethyl-4-piperidinyl)amino]-1,3,5-triazin-2-yl]amino]propyl]-N,N”-dibutyl-N,N”-bis(1,2,2,6,6-pentamethyl-4-piperidinyl)-1,3,5-triazin-2,4,6-triamine;

[0135] Antioxidant Y1: Pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate]: Tris[2,4-di-tert-butylphenyl]phosphite = 1:2;

[0136] Antioxidant Y2: Triethylene glycol bis[β-(3-tert-butyl-4-hydroxy-5-methylphenyl)propionate]: Bis(2,4-dicumylphenyl)pentaerythritol-diphosphite = 1:1;

[0137] UV absorber Z1: 2-(2'-hydroxy-3'-tert-butyl-5'-methylphenyl)-5-chlorobenzotriazole;

[0138] UV absorber Z2: 2-hydroxy-4-n-octyloxybenzophenone;

[0139] UV absorber Z3: 2-(4,6-diphenyl-1,3,5-triazine-2-yl)-5-hexyloxy-phenol;

[0140] Nucleating agent H1: Diphenyldihydrazide adipic acid;

[0141] Nucleating agent H2: N-tert-butyl-N'-(4-ethylbenzoyl)-3,5-dimethylbenzoylhydrazine;

[0142] Chain extender E1: n-Butyl-4,4-bis(tert-butylperoxy)valerate;

[0143] Chain extender E2: 1,1-bis(tert-butylperoxy)-3,3,5-trimethylcyclohexane;

[0144] Chain extender E3: a copolymer of 2-methyl methacrylate with 2-butyl acrylate, styrene, 1-methylstyrene and 2-methyl-2-acrylate (CAS: 60621-79-6);

[0145] Chain extender E4: a copolymer of acrylonitrile and glycidyl methacrylate (CAS: 58152-79-7);

[0146] Chain extender E5: a copolymer of methyl methacrylate with butyl 2-acrylate, styrene, 1-methylstyrene and glycidyl 2-methyl-2-acrylate: pyromellitic dianhydride molar ratio = 4:1;

[0147] Chain extender E6: a copolymer of acrylonitrile and glycidyl methacrylate: cyclobutanetetracarboxylic acid dianhydride molar ratio = 5:2;

[0148] Chain extender E7: Tricyclooxypropyl isocyanurate: Pyromellitic dianhydride molar ratio = 3:1;

[0149] Chain extender E8: molar ratio of glycerol triglycidyl ether to cyclobutanetetracarboxylic acid dianhydride = 4:1.

[0150] Test method:

[0151] Tensile strength and elongation at break: tested according to the method described in GB / T1040.3.

[0152] Retention rate of tensile strength at break and elongation at break: The performance and retention rate were tested according to the aging test method described in GB / T16422 and the method described in GB / T1040.3.

[0153] Water vapor transmission rate: Tested according to the method described in GB / T 1037.

[0154] Right-angle tear strength: Tested according to the method described in QB / T 1130.

[0155] Light transmittance and haze: tested according to the method described in GB / T 2410.

[0156] Drop impact strength: Tested according to the method described in ASTM D 1709.

[0157] Biodegradation rate: Tested according to the method described in GB / T 19277.2.

[0158] Preparation Example 1

[0159] This preparation example illustrates the preparation of aerogel compound fertilizer.

[0160] QNJ1

[0161] Take 500ml of deionized water in a beaker, add 20g of zeatin powder, 2g of disodium lauryl sulfosuccinate monoester, 1.5g of N-methyl-N-vinylformamide, and 15g of tetrabutylammonium hydrogen phosphate under mechanical vibration and stirring, and mix and react. After stirring evenly, slowly add formic acid at a volume fraction of 70% relative to deionized water to the suspension, disperse by ultrasonication, and stir continuously at low speed. After stirring evenly, let stand to remove bubbles until the solution is clear; freeze dry, pour the clarified solution into ampoules, pre-freeze at -25℃ for 12h, and then dry at -100℃ under vacuum for 24h to prepare zeatin block aerogel containing fertilizer; cut into approximately 3*3*3mm cube blocks.

[0162] QNJ2

[0163] Take 500 ml of deionized water in a beaker, add 25 g of zeatin powder, 1.5 g of lauramide propyl betaine, 2 g of N-ethyl-N-vinylhexamide, and 18 g of N-methyl-3-indole ethyl acetate under mechanical vibration and stirring, and mix and react. After stirring evenly, slowly add acetic acid with a volume fraction of 75% relative to deionized water to the suspension, disperse by ultrasonication, and stir continuously at low speed. After stirring evenly, let stand to remove bubbles until the solution is clear; freeze dry, pour the clarified solution into an ampoule, pre-freeze at -25℃ for 12 h, and then dry at -100℃ under vacuum for 24 h to prepare zeatin block aerogel containing fertilizer; cut into approximately 3*3*3 mm cube blocks.

[0164] QNJ3

[0165] Take 500ml of deionized water in a beaker, add 15g of zeatin powder, 1g of lauramide propylamine oxide, 2g of N-n-propyl-N-vinylheptamide, and 20g of diammonium phosphate under mechanical vibration and stirring, and mix and react. After stirring evenly, slowly add acetic acid with a volume fraction of 75% relative to deionized water to the suspension, disperse by ultrasonication, and stir continuously at low speed. After stirring evenly, let stand to remove bubbles until the solution is clear; freeze dry, pour the clear solution into an ampoule, pre-freeze at -25℃ for 12h, and then dry at -100℃ under vacuum for 24h to prepare zeatin block aerogel containing fertilizer; cut into approximately 3*3*3mm cube blocks.

[0166] QNJ4

[0167] Take 500ml of deionized water in a beaker, add 20g of zeatin powder, 0.5g of disodium lauryl sulfosuccinate monoester, 0.75g of N-methyl-N-vinylformamide, and 5g of tetrabutylammonium hydrogen phosphate under mechanical vibration and stirring, and mix and react. After stirring evenly, slowly add formic acid at a volume fraction of 70% relative to deionized water to the suspension, disperse by ultrasonication, and stir continuously at low speed. After stirring evenly, let stand to remove bubbles until the solution is clear; freeze dry, pour the clarified solution into ampoules, pre-freeze at -25℃ for 12h, and then dry at -100℃ under vacuum for 24h to prepare zeatin block aerogel containing fertilizer; cut into approximately 3*3*3mm cube blocks.

[0168] QNJ5

[0169] Take 500ml of deionized water in a beaker, add 5g of zeatin powder, 2g of disodium lauryl sulfosuccinate monoester, 1.5g of N-methyl-N-vinylformamide, and 15g of tetrabutylammonium hydrogen phosphate under mechanical vibration and stirring, and mix and react. After stirring evenly, slowly add formic acid at a volume fraction of 70% relative to deionized water to the suspension, disperse by ultrasonication, and stir continuously at low speed. After stirring evenly, let stand to remove bubbles until the solution is clear; freeze dry, pour the clarified solution into ampoules, pre-freeze at -25℃ for 12h, and then dry at -100℃ under vacuum for 24h to prepare zeatin block aerogel containing fertilizer; cut into approximately 3*3*3mm cube blocks.

[0170] QNJ6

[0171] The only difference from QNJ1 is that the zeatin powder is replaced with isopentened adenine.

[0172] QNJ7

[0173] The only difference from QNJ1 is that the zeatin powder is replaced with N. 6 - Furan methyl adenine.

[0174] Preparation Example 2

[0175] PBAT(A1)

[0176] (1) Preparation of aliphatic aromatic copolyester: Under the action of a catalyst, 679.6 g (3.5 mol) of monomer a dimethyl terephthalate, 570.8 g (7.5 mol) of monomer b 1,3-propanediol, 657.6 g (4.5 mol) of monomer c adipic acid and 0.7 g (0.005 mol) of monomer d pentaerythritol were mixed and subjected to esterification reaction. The long-branched aliphatic aromatic copolyester obtained had a melt index of 40 g / 10 min at 190 °C and 2.16 kg load. The catalyst contained 0.245 g tetrabutyl titanate (purchased from Beijing Chemical Reagent Company), 0.31 g lanthanum stearate, 0.1 g dibutyltin oxide (purchased from Beijing Chemical Plant No. 3), and 0.14 g triphenyltin hydroxide (purchased from Beijing Chemical Reagent Company).

[0177] (2) 500g of the fatty aromatic copolyester obtained in step (1) and 3g of n-butyl-4,4-bis(tert-butylperoxy)valerate were extruded in an extruder at 170℃ to prepare a copolyester. The resulting copolyester had a melt index of 2.3g / 10min at 190℃ and a load of 2.16kg, and a weight-average molecular weight of 9.01×10⁻⁶. 4 .

[0178] PBAT(A2)

[0179] (1) Preparation of aliphatic aromatic copolyester: Under the action of a catalyst, 679.6 g (3.5 mol) of monomer a dimethyl terephthalate, 570.8 g (7.5 mol) of monomer b 1,3-propanediol, 657.6 g (4.5 mol) of monomer c adipic acid and 0.7 g (0.005 mol) of monomer d pentaerythritol were mixed and subjected to esterification reaction. The long-branched aliphatic aromatic copolyester obtained had a melt index of 40 g / 10 min at 190 °C and 2.16 kg load. The catalyst contained 0.245 g tetrabutyl titanate (purchased from Beijing Chemical Reagent Company), 0.31 g lanthanum stearate, 0.1 g dibutyltin oxide (purchased from Beijing Chemical Plant No. 3), and 0.14 g triphenyltin hydroxide (purchased from Beijing Chemical Reagent Company).

[0180] (2) 500g of the long-branched fatty aromatic copolyester obtained in step (1) was mixed with 4g of tricyclooxypropyl isocyanurate:pyromellitic dianhydride in a molar ratio of 3:1. The mixture was extruded in an extruder at 170℃ to prepare a copolyester. The resulting copolyester had a melt index of 2.7g / 10min at 190℃ and a load of 2.16kg, and a weight-average molecular weight of 8.13×10⁻⁶. 4 .

[0181] PBST(A3)

[0182] (1) Under the action of a catalyst, a long-branched aliphatic aromatic copolyester was prepared by esterification of monomer a terephthalic acid (PTA) 423.8g (2.55mol), monomer b 1,4-butanediol (BDO) 650g (7.21mol), monomer c succinic acid (SA) 330g (2.79mol) and monomer d glycerol 1g (0.01mol). The melt index of the copolyester was 23g / 10min at 190℃ and 2.16kg load. The catalyst contained 0.245g tetrabutyl titanate (purchased from Beijing Chemical Reagent Company), 0.31g lanthanum stearate, 0.1g dibutyltin oxide (purchased from Beijing Chemical Plant No. 3), and 0.14g triphenyltin hydroxide (purchased from Beijing Chemical Reagent Company).

[0183] (2) 500g of the fatty aromatic copolyester obtained in step 1) and 3g of 1,1-bis(tert-butylperoxy)-3,3,5-trimethylcyclohexane were extruded in an extruder at 175℃ to prepare a copolyester. The resulting copolyester had a melt index of 1.7g / 10min at 190℃ and a load of 2.16kg, and a weight-average molecular weight of 10.62×10⁻⁶. 4 .

[0184] PBST(A4)

[0185] (1) Under the action of a catalyst, a long-branched aliphatic aromatic copolyester was prepared by esterification of monomer a terephthalic acid (PTA) 423.8g (2.55mol), monomer b 1,4-butanediol (BDO) 650g (7.21mol), monomer c succinic acid (SA) 330g (2.79mol) and monomer d glycerol 1g (0.01mol). The melt index of the copolyester was 23g / 10min at 190℃ and 2.16kg load. The catalyst contained 0.245g tetrabutyl titanate (purchased from Beijing Chemical Reagent Company), 0.31g lanthanum stearate, 0.1g dibutyltin oxide (purchased from Beijing Chemical Plant No. 3), and 0.14g triphenyltin hydroxide (purchased from Beijing Chemical Reagent Company).

[0186] (2) 500g of the fatty aromatic copolyester obtained in step 1) and 5.5g of the copolymer of methyl methacrylate, butyl 2-acrylate, styrene, 1-methylstyrene, and glycidyl 2-methyl-2-acrylate in a molar ratio of pyromellitic dianhydride = 4:1 were extruded in an extruder at 170°C to prepare a copolyester. The resulting copolyester had a melt index of 1.9g / 10min at 190°C and a load of 2.16kg, and a weight-average molecular weight of 9.67×10⁻⁶. 4 .

[0187] PBAT(A5)

[0188] (A5) Step 1 is the same as (A1), except that step 2 is as follows:

[0189] (2) 500g of the fatty aromatic copolyester obtained in step (1) and 1g of neodecanoate peroxide were extruded in an extruder at 170℃ to prepare a copolyester. The resulting copolyester had a melt index of 1.9g / 10min at 190℃ and a load of 2.16kg, and a weight-average molecular weight of 11.13×10⁻⁶. 4 .

[0190] PBAT(A6)

[0191] (A6) Step 1 is the same as (A2), except that step 2 is as follows:

[0192] 500g of the long-branched fatty aromatic copolyester obtained in step (1) was mixed with 3.3g of n-butyl-4,4-bis(tert-butylperoxy)valerate:N,N,N',N'-tetraglycidyl-4,4'-diaminodiphenylmethane in a molar ratio of 2:1. The mixture was extruded in an extruder at 170°C to prepare a copolyester. The resulting copolyester had a melt index of 2.3g / 10min at 190°C and a load of 2.16kg, and a weight-average molecular weight of 9.97×10⁻⁶. 4 .

[0193] PBST(A7)

[0194] (A7) Step 1 is the same as (A3), except that step 2 is as follows:

[0195] 500g of the fatty aromatic copolyester obtained in step 1) was mixed with 2.4g of 1-dimethyl-3-hydroxybutyl ester and tert-amyl peroxide in a molar ratio of 1:3. The mixture was then extruded at 175℃ to prepare a copolyester. The resulting copolyester had a melt index of 1.51g / 10min and a weight-average molecular weight of 11.95×10⁻⁶ at 190℃ and a load of 2.16kg. 4 .

[0196] PBST(A8)

[0197] (A8) Step 1 is the same as (A4), except that step 2 is as follows: 500g of the fatty aromatic copolyester obtained in step 1) is mixed with 2.5g of tert-butyl peroxide:resorcinol tetraglycidyl ether in a molar ratio of 2:3. The mixture is then extruded at 170℃ to prepare the copolyester. The resulting copolyester has a melt index of 2.1g / 10min at 190℃ and a load of 2.16kg, and a weight-average molecular weight of 8.99×10⁻⁶. 4 .

[0198] Examples 1-18

[0199] The examples illustrate the method for preparing biodegradable resin films:

[0200] The corresponding components—biodegradable resin A, biodegradable resin B, bio-based elastomer C, the aerogel compound fertilizer QNJ described in Preparation Example 1, nucleating agent, chain extender, hydrolysis inhibitor, slip agent, light stabilizer, UV absorber, and antioxidant—were mixed using a high-speed mixer or fed into the feed inlet of a twin-screw extruder using a loss-in-weight weighing system. The twin-screw extruder, with 7-stage temperature control, maintained temperatures of 50°C, 100°C, 150°C, 200°C, 230°C, 230°C, and 200°C from the feed inlet to the die, yielding a blown film modified material. This blown film material was then blown onto a blown film machine at a specific die temperature and blow-up ratio to obtain a film with a thickness of 10 ± 0.5 μm. Tensile strength and elongation at break retention were obtained after aging tests according to GB / T 16422. The types and proportions of the corresponding biodegradable resin additives, and the blown film die temperature and blow-up ratio are shown in Table 1. The difference between Example 17 and Example 1 is that PBAT is replaced with A5, and the difference between Example 18 and Example 3 is that PBST is replaced with A7.

[0201] The prepared thin film was subjected to performance tests. Its optical properties are shown in Table 2, and the mechanical and barrier properties test results are shown in Table 3.

[0202] Comparative Examples 1-10

[0203] Comparative Example 1 uses fertilizer directly added to the mulch film composition, otherwise the same as in Example 1. Comparative Example 2 does not add biodegradable component B, otherwise the same as in Example 1. Comparative Example 3 does not add bio-based elastomer C, otherwise the same as in Example 1. Comparative Example 4 has a lower amount of biodegradable component B added than the preferred range, otherwise the same as in Example 1. Comparative Example 5 has a higher amount of biodegradable component B added than the preferred range, otherwise the same as in Example 1. Comparative Example 6 does not use a chain extender, otherwise the same as in Example 1. Comparative Example 7 does not use an anti-hydrolysis agent, otherwise the same as in Example 1. Comparative Example 8 does not use a light stabilizer, otherwise the same as in Example 1. Comparative Example 9 does not use a UV absorber, otherwise the same as in Example 1. Comparative Example 10 differs from Example 1 only in that QNJ1 is replaced with polyvinyl alcohol coated fertilizer, otherwise the same as in Example 1. Specific addition amounts are shown in Table 1. Tensile breaking strength and elongation at break retention rates were obtained after aging tests according to GB / T 16422.

[0204] The prepared films were subjected to performance tests. The optical properties are shown in Table 2, and the mechanical and barrier properties are shown in Table 3. Among them, the amount of biodegradable component B added in Comparative Example 5 was higher than the preferred range, and it could not be formed by top blowing.

[0205]

[0206]

[0207]

[0208]

[0209]

[0210]

[0211]

[0212] As shown in Tables 2 and 3, when the aerogel composite fertilizer and additives of this invention are added to the biodegradable resin for blown film production, the resulting film exhibits excellent mechanical and barrier properties. The bio-based elastomer, fertilizer preparation method, and chain extenders all significantly influence the performance of the blown film. Adding little or no biodegradable resin B fails to improve the barrier properties of the biodegradable film. Without the addition of light stabilizers or UV absorbers, the film's aging resistance is poor. As shown in Example 6, the addition amount of copolymer PGA to biodegradable resin A can reach 60%, significantly reducing water vapor permeability and effectively lowering film production costs. In Comparative Example 1, the fertilizer-containing biodegradable mulch film obtained by directly using chemical fertilizer (10 parts by weight of diammonium phosphate) without preparing the aerogel composite fertilizer showed a biodegradation rate of less than 90% after 180 days, failing to meet the degradation requirements. After conducting potato mulching experiments in the examples and comparative examples, it was found that Comparative Example 1, using diammonium phosphate alone, did not have a slow-release effect and its effect on improving soil fertility was limited due to water loss from precipitation. Comparative Examples 2 and 4, with no added PGA or low PGA content, had high water vapor permeability of the biodegradable mulch film, failing to retain moisture and resulting in lower yields. Comparative Examples 6 and 7, lacking chain extenders or hydrolysis inhibitors, caused the mulch film to disintegrate prematurely, failing to meet the requirements for heat preservation and moisture retention during spring plowing. Comparative Examples 8 and 9, lacking light stabilizers and UV absorbers, resulted in an earlier induction period and premature disintegration of the mulch film, also failing to meet the requirements for heat preservation and moisture retention during spring plowing. Comparing Examples 13 and 14 with Example 1, it can be seen that when the components for preparing the zeatin aerogel are not within the preferred range, the mechanical properties are slightly reduced, and the potato yield decreases by 5 wt%. Specifically, in Example 13, when zeatin was used at the upper limit, the light transmittance decreased and the haze increased. Comparing Example 10 with Example 1, it was found that after using polyvinyl alcohol-coated fertilizer, the mechanical properties decreased, water permeability increased, light transmittance decreased, and haze increased. Furthermore, the use of polyvinyl alcohol affected the overall degradation performance of the mulch film, resulting in a potato yield decrease of over 15 wt%. Comparing Example 17 with Example 1, it was found that using the PBAT(A5) chain extension system cumuloperoxyneocetate from Preparation Example 2, with a reduced weight ratio, resulted in a higher molecular weight of PBAT. Therefore, the mechanical properties and performance retention rate after aging of the mulch film were improved, and the water permeability was further reduced. Consequently, the service life of the mulch film was extended, the moisture retention effect was better, and the potato yield was further increased. Compared with Example 3, Example 18 found that using the chain extension system of PBST (A7) in Preparation Example 2, with a molar ratio of 1-dimethyl-3-hydroxybutyl ester to tert-amyl peroxide of 1:3 and a reduced amount of PBST, the molecular weight of PBST was increased. Therefore, the mechanical properties and performance retention rate after aging of the mulch film were improved, and the water permeability was further reduced. As a result, the service life of the mulch film was extended, the moisture retention effect was better, and the potato yield was further increased.

[0213] The various embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

[0214] The endpoints and any values ​​of the ranges disclosed herein are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of the various ranges, the endpoint values ​​of the various ranges and individual point values, and individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed herein.

Claims

1. An aerogel compound fertilizer, characterized in that, The aerogel composite fertilizer comprises a bio-based polymer material carrier and fertilizer loaded on the bio-based polymer material carrier, and is prepared by reacting bio-based polymer materials, additives, and water-soluble fertilizers; the bio-based polymer material is a plant hormone, preferably zeatin, 6-(4-hydroxy-3-methyl-2-butenyl)aminopurine, isopentenyl adenine, N... 6 -Benzyladenine and N 6 At least one of furanylmethyladenine; the adjuvant is a long-chain aliphatic compound and an N-vinylamide polymer; The aerogel compound fertilizer comprises 100 parts by weight, the bio-based polymer material comprises 20-60 parts by weight, preferably 35-55 parts by weight, the long-chain aliphatic compound comprises 1-10 parts by weight, preferably 2-6 parts by weight, the N-vinylamide polymer comprises 1-10 parts by weight, preferably 3-6 parts by weight, and the water-soluble fertilizer comprises 10-80 parts by weight, preferably 30-60 parts by weight.

2. The aerogel compound fertilizer according to claim 1, wherein, The long-chain aliphatic compound is at least one of long-chain aliphatic metal salts, long-chain aliphatic amides, and long-chain aliphatic bases, preferably selected from at least one of disodium lauryl sulfosuccinate monoester, potassium monododecyl phosphate, potassium lauryl ether phosphate, cocoyl diethanolamide, cocamidopropyl betaine, lauramidopropyl betaine, cocamidopropyl hydroxysulfonyl betaine, lauramidopropyl hydroxysulfonyl betaine, lauramidopropyl hydroxysulfonyl betaine, lauramidopropyl amine oxide, sodium lauryl amphoteric acetate, and potassium fatty acid soap. The N-vinylamide polymer is an N-vinylamide homopolymer and / or an N-vinylamide copolymer, preferably selected from N-vinylheptamide, N-vinyloctamide, N-vinylnonamide, N-vinyldecamide, N-methyl-N-vinylformamide, N-methyl-N-vinylacetamide, N-methyl-N-vinylpropionamide, N-methyl-N-vinylbutyramide, N-methyl-N-vinylpentamide, N-methyl-N-vinylhexamide, N-methyl-N-vinylheptamide, N-methyl-N-vinyloctamide, N-methyl-N-vinylnonamide, N-methyl-N-vinyldecamide, N-ethyl-N-vinylformamide, N-ethyl-N-vinylacetamide, N-ethyl-N-vinylpropionamide, N-ethyl-N-vinylbutyramide, N-ethyl-N-vinylpentamide, N-ethyl-N-vinylhexamide, N-ethyl-N-vinylheptamide, N-ethyl-N-vinyldecamide, N-ethyl-N-vinylcarboxamide, N-ethyl-N-vinylacetamide, N-ethyl-N-vinylpropionamide, N-ethyl-N-vinylbutyramide, N-ethyl-N-vinylpentamide, N-ethyl-N-vinylhexamide, N-ethyl-N-vinylheptamide, N-ethyl-N-vinyloctamide, N... -Ethyl-N-vinylnonamide, N-Ethyl-N-vinyldecamide, N-n-propyl-N-vinylformamide, N-n-propyl-N-vinylacetamide, N-n-propyl-N-vinylpropionamide, N-n-propyl-N-vinylbutyramide, N-n-propyl-N-vinylpentamide, N-n-propyl-N-vinylhexamide, N-n-propyl-N-vinylheptamide, N-n-propyl-N-vinyloctamide, N-n-propyl-N-vinylnonamide, N-n-propyl At least one of N-vinyldecanoamide, N-isopropyl-N-vinylformamide, N-isopropyl-N-vinylacetamide, N-isopropyl-N-vinylpropionamide, N-isopropyl-N-vinylbutyramide, N-isopropyl-N-vinylpentanamide, N-isopropyl-N-vinylhexamide, N-isopropyl-N-vinylheptamide, N-isopropyl-N-vinyloctamide, N-isopropyl-N-vinylnonamide, and N-isopropyl-N-vinyldecanoamide; The water-soluble fertilizer is selected from at least one of nitrogen fertilizer, potassium fertilizer, phosphate fertilizer, and their compound fertilizers, preferably from L-homocysteine, L-4,4'-dithiobis(2-aminobutyric acid), DL-homocysteine, DL-4,4'-dithiobis(2-aminobutyric acid), L-2-aminobutyric acid, D-2-aminobutyric acid, DL-2-aminobutyric acid, 2-aminobutyric acid, urea, polyglutamic acid methyl ester, polyglutamic acid butyl ester, polyglutamic acid ethyl ester, potassium hexadecyl phosphate, potassium dihydrogen phosphate, and tetrabutylammonium hydrogen phosphate. At least one of the following: potassium nitrate, potassium nitrite, polyaspartic acid, indoleacetic acid, indoleacetic acid ester, 2-methyl-3-indoleacetic acid, 2-indoleacetic acid, 3-indoleacetic acid potassium, N-methyl-3-indoleacetic acid, 5-methoxy-2-methyl-3-indoleacetic acid, 2-methyl-3-indoleacetic acid, 1-methyl-3-indoleacetic acid, 3-amino-1,4-dimethyl-5H-pyridine[4,3-B]indoleacetic acid, monoammonium phosphate, polyammonium phosphate, diammonium phosphate, and potassium humate.

3. The aerogel compound fertilizer according to claim 1, wherein, The preparation method of the aerogel compound fertilizer includes the following steps: Under stirring conditions, bio-based polymer materials, additives, and water-soluble fertilizers are added to deionized water for mixing and reaction to obtain a suspension. An organic acid solution is added, and the mixture is ultrasonically dispersed and stirred evenly. The mixture is allowed to stand to defoam until the solution is clear, and then frozen and dried to obtain the aerogel composite fertilizer. The organic acid solution is preferably selected from formic acid solution and / or acetic acid solution; Preferably, the freezing temperature is -40℃ to -10℃ and the time is 10-15h; the drying is carried out under vacuum conditions at a temperature of -120℃ to -80℃ for 20-30h.

4. A biodegradable composition, characterized in that, The biodegradable resin composition comprises the following components in parts by weight: Biodegradable resin A: 35-95 parts by weight, preferably 35-75 parts by weight; Biodegradable resin B: 4-60 parts by weight, preferably 20-60 parts by weight; Bio-based elastomer C1 to 5 parts by weight, preferably 2 to 5 parts by weight; Based on 100 parts by weight of the biodegradable resin composition, the biodegradable composition further comprises the following components in parts by weight: 5-15 parts by weight, preferably 5-10 parts by weight, of the aerogel compound fertilizer according to any one of claims 1-3; The additive is 0.01 to 12 parts by weight, preferably 0.02 to 10 parts by weight; The additives include chain extenders, hydrolysis inhibitors, light stabilizers, and ultraviolet absorbers; Wherein, the biodegradable resin A is a chain extender-modified aliphatic aromatic copolyester; and the biodegradable resin B is polyglycolic acid.

5. The biodegradable composition according to claim 4, wherein, Based on 100 parts by weight of the biodegradable resin composition, the chain extender contains 0.01 to 0.5 parts by weight, preferably 0.1 to 0.25 parts by weight; the hydrolysis inhibitor contains 0.1 to 1 part by weight, preferably 0.5 to 1 part by weight; the light stabilizer contains 0.01 to 0.5 parts by weight, preferably 0.4 to 0.5 parts by weight; and the ultraviolet absorber contains 0.01 to 0.5 parts by weight, preferably 0.3 to 0.5 parts by weight.

6. The biodegradable composition according to claim 4, wherein, The additive also contains at least one of the following components in 100 parts by weight of the biodegradable resin composition: The slip agent is used in amounts of 0.05 to 5 parts by weight, preferably 0.1 to 0.3 parts by weight; The antioxidant is used in an amount of 0.01 to 0.5 parts by weight, preferably 0.1 to 0.5 parts by weight; The nucleating agent is used in amounts of 0.01 to 0.5 parts by weight, preferably 0.05 to 0.2 parts by weight.

7. The biodegradable composition according to claim 4, wherein, The melt flow index of the biodegradable resin A at 190℃ and 2.16kg load is 0.1-10g / 10min; The modified fatty aromatic copolyester is obtained by modifying the fatty aromatic copolyester with a chain extender; the amount of the chain extender is 0.02-3 wt% of the amount of the fatty aromatic copolyester, preferably 0.03-1.5 wt%.

8. The biodegradable composition according to claim 4, wherein, The aliphatic aromatic copolyester is obtained by esterification of monomers b, c, and d, and optionally monomer a, in the presence of a catalyst; wherein, The monomer a is an aromatic dicarboxylic acid and / or its ester derivative, preferably terephthalic acid and / or dimethyl terephthalate; The monomer b is C2-C. 10 Aliphatic diols and / or C3-C 10 Alicyclic diols, preferably 1,3-propanediol and / or 1,4-butanediol; The monomer c is C4-C 20 Aliphatic dicarboxylic acids and / or their ester derivatives, preferably selected from at least one of succinic acid, dimethyl succinate, adipic acid, or dimethyl adipic acid and furanyl dicarboxylic acid; The monomer d is at least one of a polyol with a functionality greater than 2, a polycarboxylic acid with a functionality greater than 2, and an acid anhydride with a functionality greater than 2, preferably selected from at least one of pyromellitic dianhydride, glycerol, and pentaerythritol. Preferably, the amounts of monomers a, b, c, and d satisfy the following: the molar ratio of (a+c):b is 1:(1~2.8), the molar ratio of (a+c):d is (150~1800):1, and the molar ratio of a:c is 0:100~80:20, preferably 0.01:99.99~60:

40.

9. The biodegradable composition according to claim 8, wherein, The catalyst is selected from at least one of the first catalyst, the second catalyst, and the third catalyst; The first catalyst is selected from at least one of oxides of M, M(OR1)n, and M(OOCR2)m, wherein M is titanium, antimony, or zinc, n and m are each independently the valence state of M, and R1 is C1-C. 10 Alkyl group, R2 is C1-C 20 The alkyl group; preferably, the first catalyst is selected from at least one of alkoxytitanium, antimony acetate, zinc acetate, oxides of zinc, oxides of antimony and oxides of titanium, and more preferably from at least one of tetrabutyl titanate, isopropoxytitanium, titanium dioxide, antimony trioxide, antimony acetate and zinc acetate. The second catalyst is a compound of RE(R3)3, wherein RE is a rare earth metal element, preferably selected from at least one of lanthanum, cerium, praseodymium, neodymium, terbium, ytterbium, dysprosium, samarium, and scandium, more preferably selected from at least one of lanthanum, cerium, praseodymium, neodymium, and scandium, and R3 is selected from at least one of halogen, alkoxy, aryloxy, acetylacetonate, and R4COO- group, wherein R4 is C1-C 30 Alkyl groups, preferably C1-C 20 Alkyl groups, more preferably C3-C 18 The alkyl group; preferably, the halogen is chlorine or bromine, the alkoxy group is a C3-C6 alkoxy group, the alkyl group of the alkoxy group is at least one of isopropyl, n-butyl or isopentyl, the aryloxy group includes at least one aryloxy group of a benzene ring and / or a naphthyl ring, and the aryl group in the aryloxy group is 2,6-di-tert-butyl-4-methylphenyl or 4-butylphenyl; more preferably, the second catalyst is at least one of lanthanum acetylacetonate, neodymium acetylacetonate, neodymium isopropoxy, lanthanum isopropoxy, scandium isopropoxy, lanthanum stearate, neodymium stearate, lanthanum chloride, tris(2,6-di-tert-butyl-4-methylphenoxy)lanthanum and their hydrates; The third catalyst is an organotin compound, preferably selected from at least one of dibutyltin oxide, methylphenyltin oxide, tetraethyltin, hexaethyltin oxide, hexacyclohexylditin oxide, di(dodecyl)tin oxide, triethylhydroxytin, triphenylhydroxytin, triisobutyltin acetate, dibutyltin diacetate, diphenyltin dilaurate, monobutyltin trichloride, tributyltin chloride, dibutyltin sulfide, butyltin hydroxyoxide, methylstannic acid, ethylstannic acid, and butylstannic acid; more preferably selected from at least two of dibutyltin oxide, tetraethyltin, triphenylhydroxytin, dibutyltin diacetate, diphenyltin dilaurate, monobutyltin trichloride, tributyltin chloride, dibutyltin sulfide, butyltin hydroxyoxide, methylstannic acid, ethylstannic acid, and butylstannic acid; the content of each component in the third catalyst is 10-90 mol%, preferably 30-70 mol%. Preferably, the catalyst is a mixture of a first catalyst, a second catalyst, and a third catalyst, wherein the molar ratio of the first catalyst to the second catalyst to the third catalyst is (0.1–20):(0.1–15):1, and more preferably (0.1–10):(0.1–10):1; The total amount of catalyst used is in a molar ratio of 1:(1000-20000) to monomer (a+c), preferably 1:(1000-10000).

10. The biodegradable composition according to claim 4, wherein, The polyglycolic acid is homopolymer polyglycolic acid and / or copolymer polyglycolic acid; Preferably, the comonomer of the copolymerized polyglycolic acid is at least one selected from cyclic monomers, lactones, carbonates, ethers, ether esters, amides, hydroxycarboxylic acids, alkyl hydroxy acids, aliphatic diols, aliphatic dicarboxylic acids, and esters of aliphatic diols and aliphatic dicarboxylic acids. More preferably, the cyclic monomer is 1,4-dioxane-2,3-dione and / or lactide; the lactone is preferably at least one selected from p-propiolactone, p-butyrolactone, p-neovalactone, p-butyrolactone, δ-valerolactone, p-ethylδ-valerolactone, and ε-caprolactone; the carbonate is trimethylene carbonate; the ether is 1,3-dioxane, and the ether ester is dioxane; the amide is ε-caprolactam; the hydroxycarboxylic acid is at least one selected from lactic acid, 3-hydroxypropionic acid, 3-hydroxybutyric acid, 4-hydroxybutyric acid, and 6-hydroxyhexanoic acid; the aliphatic diol is ethylene glycol and / or 1,4-butanediol; and the aliphatic dicarboxylic acid is succinic acid and / or adipic acid. More preferably, the copolymerized polyglycolic acid is at least one selected from polyglycolic acid-lactide PGLA, polyglycolic acid-caprolactone PGCA, polyglycolic acid-lactide-caprolactone, and polyglycolic acid-trimethylene carbonate. More preferably, in the copolymerized polyglycolic acid, glycolic acid monomer accounts for more than 80 mol% of the total monomer content, and more preferably more than 90 mol%.

11. The biodegradable composition according to claim 4, wherein, The bio-based elastomer C is selected from at least one of the following: poly(sebacate-glycerol) elastomer, acrylated poly(sebacate-glycerol) elastomer, poly(citric acid-1,8-octanediol) elastomer, copolymer of lactide-caprolactone, glycolide-lactide copolymer, glycolide-lactide-caprolactone terpolymer, poly(ester-carbonate) elastomer, poly(citric acid-octanediol-sebacate) elastomer, poly(sebacate-glycerol-citric acid) elastomer, poly(sebacate-1,2-propanediol-citric acid) elastomer, poly(itaconate-isoprene-glycidyl methacrylate) elastomer, soybean oil-based elastomer, itacate elastomer containing a ternary epoxy structure, and myrcene-based bio-based elastomer.

12. The biodegradable composition according to claim 4, wherein, The chain extender in the additive and the chain extender in the biodegradable resin A are each independently at least one of the following: organic peroxide, condensation polymer of aromatic olefin monomers and / or acrylic monomers and epoxy functional monomers, a complex of the condensation polymer and anhydride polyfunctional monomers, and a complex of the epoxy functional monomer and anhydride polyfunctional monomers. Preferably, the organic peroxide is selected from organic peroxides with a half-life of 0.1 to 5 min within the processing temperature range, and more preferably, organic peroxides with a half-life of 0.1 to 1.5 min; more preferably, the organic peroxide is selected from at least one of peroxide esters, aliphatic peroxides, and aromatic peroxides, and more preferably from tert-butyl peroxyheptanate, tert-butyl peroxyhexanoate, cumyl peroxyheptanate, tert-pentyl peroxyheptanate, tert-butyl peroxyhexanoate, tert-butyl peroxyhexanoate, 1-dimethyl-3-hydroxybutyl peroxide, tert-pentyl peroxybenzoate, tert-butyl peroxyhexanoate, tert-pentyl peroxyhexanoate, 1-dimethyl-3-hydroxybutyl peroxide, tert-pentyl peroxybenzoate, tert-butyl peroxyhexanoate, tert-pentyl peroxyhexanoate, bis-tert-butyl peroxyhexanoate, triallyl isocyanurate, 2,5-dimethyl-2,5- At least one of the following: di(benzoylperoxy)hexane, 2,5-dimethyl-2,5-di(butylperoxy)-3-hexyne, 2,5-bis(tert-butylperoxy)-2,5-dimethylhexane, n-butyl-4,4-bis(tert-butylperoxy)valerate, 1,4-bis(tert-butylperoxyisopropyl)benzene, tert-butylperoxybenzoate, 1,1-bis(tert-butylperoxy)-3,3,5-trimethylcyclohexane, and di(2,4-dichlorobenzoyl), dibenzoylperoxide, diisopropylbenzene peroxide, aliphatic diacetylperoxide, ditert-butylperoxide, and dicumylperoxide, more preferably n-butyl-4,4-bis(tert-butylperoxy)valerate and / or 1,1-bis(tert-butylperoxy)-3,3,5-trimethylcyclohexane; Preferably, the aromatic olefin monomer is styrene and / or 1-methylstyrene; Preferably, the epoxy functional monomer is selected from at least one of glycidyl methacrylate, triglycidyl isocyanurate, glycerol triglycidyl ether, trimethylolpropane triglycidyl ether, triglycidyl p-aminophenol, N,N,N',N'-tetraglycidyl-4,4'-diaminodiphenylmethane, pyromellitic phloroglucinol triglycidyl ether, pyromellitic tetraglycidyl ether, 1,1',2,2'-tetra(p-hydroxyphenyl)ethane tetraglycidyl ether, resorcinol formaldehyde tetraglycidyl ether, bisresorcinol formaldehyde tetraglycidyl ether, and glycidyl methacrylate oligomers. Preferably, the acrylic monomer is selected from at least one of acrylic acid, methacrylic acid, acrylonitrile, methyl acrylate, ethyl acrylate, butyl acrylate, methyl methacrylate, ethyl methacrylate, and butyl methacrylate; Preferably, the anhydride-based multifunctional monomer is selected from at least one of pyromellitic dianhydride, 3,3',4,4'-benzophenone tetracarboxylic dianhydride, 3,3',4,4'-biphenyltetracarboxylic dianhydride, glycerol trimellitic anhydride, cyclobutanetetracarboxylic dianhydride, cyclopentanetetracarboxylic dianhydride, ethylenetetracarboxylic dianhydride, and 1,2,3,4-butanetetracarboxylic dianhydride, and is more preferably pyromellitic dianhydride and / or cyclobutanetetracarboxylic dianhydride; Preferably, the condensation polymer is at least one of the following: methyl methacrylate, butyl methacrylate, styrene, a copolymer of 1-methylstyrene and glycidyl 2-methyl-2-acrylate, a copolymer of acrylonitrile and glycidyl methacrylate, a copolymer of isobutyl acrylate and methyl methacrylate, a copolymer of ethyl acrylate and butyl acrylate, a copolymer of acrylonitrile and glycidyl methacrylate, and a copolymer of methacrylate and glycidyl methacrylate. More preferably, the chain extender in the additive and the chain extender in the biodegradable resin A are each independently a compound of the condensation polymer and the acid anhydride polyfunctional monomer, and the molar ratio of the condensation polymer to the acid anhydride polyfunctional monomer is 1-10:1, preferably 2-5:1; or, the chain extender in the additive and the chain extender in the biodegradable resin A are each independently a compound of the epoxy functional monomer and the acid anhydride polyfunctional monomer, and the molar ratio of the epoxy functional monomer to the acid anhydride polyfunctional monomer is 1-10:1, preferably 2-5:

1.

13. The biodegradable composition according to claim 4, wherein, The hydrolysis inhibitor is selected from polycarbodiimide, monomeric carbodimethylamine, dicyclohexylcarbodiimide, N,N'-diisopropylcarbodiimide, 2,2',6,6'-tetraisopropylcarbodimethylamine, 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride, 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride, 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride, 1-ethyl-(3-dimethylaminopropyl)carbodiimide hydrochloride, 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride, 1- At least one of (3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride, 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide, 1-(3-dimethylaminopropyl)-3-ethyl-carbodiimide hydrochloride, 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride, 1-ethyl-(3-dimethylaminopropyl)carbodiimide hydrochloride, 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride, and N-(3-dimethylaminopropyl)-N'-ethyl-carbodiimide hydrochloride and (3-dimethylaminopropyl)-3-ethylcarbodiamine.

14. The biodegradable composition according to claim 4, wherein, The light stabilizer is selected from poly(4-hydroxy-2,2,6,6-tetramethyl-1-piperidinol) ester, bis(1-octyloxy-2,2,6,6-tetramethyl-4-piperidinyl) sebacate, bis(1,2,2,6,6-pentamethylpiperidinol) sebacate, 1-(methyl)-8-(1,2,2,6,6-pentamethyl-4-piperidinyl) sebacate, bis(2,2,6,6-tetramethyl-4-piperidinyl) sebacate, poly{[6-[(1,1,3,3-tetramethylbutyl)amino]]-1,3,5-triazine-2,4-[(2,2,6,6,-tetramethyl-piperidinyl)imino]-1,6-hexamethylene[(2,2] At least one of [6,6-tetramethyl-4-piperidinyl)imino]} and N,N”'-1,2-ethylenedimethyldi[N-[3-[[4,6-di[butyl(1,2,2,6,6-pentamethyl-4-piperidinyl)amino]-1,3,5-triazin-2-yl]amino]propyl]-N,N”-dibutyl-N,N”-di(1,2,2,6,6-pentamethyl-4-piperidinyl)-1,3,5-triazin-2,4,6-triamine], preferably poly(4-hydroxy-2,2,6,6-tetramethyl-1-piperidinol) ester, bis(1-octyloxy-2,2,6,6-tetramethyl-4-piperidinyl) sebacate, poly{[6-[( At least one of 1,1,3,3-tetramethylbutyl)amino]]-1,3,5-triazine-2,4-[(2,2,6,6,-tetramethyl-piperidinyl)imino]-1,6-hexamethylene[(2,2,6,6-tetramethyl-4-piperidinyl)imino]} and N,N”'-1,2-ethylenedimethylbis[N-[3-[[4,6-bis[butyl(1,2,2,6,6-pentamethyl-4-piperidinyl)amino]-1,3,5-triazine-2-yl]amino]propyl]-N,N”-dibutyl-N,N”-bis(1,2,2,6,6-pentamethyl-4-piperidinyl)-1,3,5-triazine-2,4,6-triamine, more preferably It is poly{[6-[(1,1,3,3-tetramethylbutyl)amino]]-1,3,5-triazine-2,4-[(2,2,6,6,-tetramethyl-piperidinyl)imino]-1,6-hexamethylene[(2,2,6,6-tetramethyl-4-piperidinyl)imino]} and / or N,N”'-1,2-ethylenedimethyldi[N-[3-[[4,6-di[butyl(1,2,2,6,6-pentamethyl-4-piperidinyl)amino]-1,3,5-triazine-2-yl]amino]propyl]-N,N”-dibutyl-N,N”-di(1,2,2,6,6-pentamethyl-4-piperidinyl)-1,3,5-triazine-2,4,6-triamine].

15. The biodegradable composition according to claim 4, wherein, The ultraviolet absorber is selected from 2-(2-hydroxy-3,5-di-tert-butylphenyl)-5-chlorobenzotriazole, 2-(2-hydroxy-5-methylphenyl)benzotriazole, 2-(2'-hydroxy-3'-tert-butyl-5'-methylphenyl)-5-chlorobenzotriazole, 2-(2'-hydroxy-3',5'-dipentylphenyl)benzotriazole, 2-(2'-hydroxy-3',5'-di-tert-pentylphenyl)benzotriazole, 2,4-dihydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-n-octyloxybenzophenone, phenyl benzoate, resorcinol monobenzoate, o-nitroaniline, p-cresol, 2,4,6-tris(2-hydroxy-4-n-butoxyphenyl)-1,3,5-triazine, 2-cyano-3 At least one of 2-ethylhexyl 3-diphenylacrylate, p-tert-butylphenyl salicylate, bisphenol A bis(3,5-di-tert-butyl-4-hydroxybenzylphosphonic acid monoethyl ester), 2,2'-thiobis(4-tert-octylphenoloxy)nickel, 2-(4,6-diphenyl-1,3,5-triazin-2-yl)-5-hexyloxy-phenol, and 2-(4,6-bis(2,4-dimethylphenyl)-1,3,5-triazin-2-yl)-5-octyloxy-phenol, preferably selected from at least one of 2-(2'-hydroxy-3'-tert-butyl-5'-methylphenyl)-5-chlorobenzotriazole, 2-hydroxy-4-n-octyloxybenzophenone, and 2-(4,6-diphenyl-1,3,5-triazin-2-yl)-5-hexyloxy-phenol.

16. The biodegradable composition according to claim 6, wherein, The slip agent is a stearate and / or an organic carboxylic acid amide; preferably, the stearate is calcium stearate, and the organic carboxylic acid amide is selected from at least one of erucamide, oleamide, stearyl stearamide and N,N'-ethylene bis-stearamide.

17. The biodegradable composition according to claim 6, wherein, The nucleating agent is an acylhydrazine compound, preferably selected from pyridine-4-carboxylhydrazine, 4,4'-oxobis(benzenesulfonylhydrazine), carbamoylhydrazine, benzenesulfonylhydrazine, maleic hydrazine, sebacic acid dihydrazine, cyanoacetylhydrazine, 2-amino-3-hydroxy-2'-(2,3,4-trihydroxybenzyl)propionylhydrazine, oxalamide hydrazine, pyrazine-2-carboxylhydrazine, 2-hydroxybenzoylhydrazine, 4-hydroxy-2'-(5-nitrofuranyl)benzoylhydrazine, oxaloyl dihydrazine, succinic acid-N,N-dimethyl hydrazine, thiophene-2-carboxylic acid hydrazine, 3,5-dinitrobenzoylhydrazine, p-methoxybenzoylhydrazine, 2-furanylhydrazine, 4-aminophthalic acid hydrazine, 4-nitrophthalic acid hydrazine, etc. Phthaloylhydrazide, 3-nitrophthaloylhydrazide, dodecanedicarboxylic acid dihydrazide, malonyl hydrazide, ethoxycarboxylhydrazide, pyridine-2,6-dicarboxylic acid dihydrazide, p-aminobenzoylhydrazide, N-tert-butyl-N'-(4-ethylbenzoyl)-3,5-dimethylbenzoylhydrazide, 4-(N-ethyl-N-aminobutylamino)phthaloylhydrazide, tetrahydro-3-furanoylhydrazide, tartrate dihydrazide, 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionylhydrazide, p-tert-butylbenzoylhydrazide, 2,2-dimethylpropionylhydrazide, 2-ethoxybenzoylhydrazide, 2-hydroxy-3,5-dinitro-2'-(5-nitrofuranmethylidene)-benzene Acylhydrazide, m-toluylhydrazide, o-toluylhydrazide, 4-amino-2-hydroxybenzoylhydrazide, tert-butoxycarbonylglycine acylhydrazide, lauroylhydrazide, p-hydroxybenzoylhydrazide, octanoylhydrazide, nicotinic acylhydrazide, bis[(phenylmethylene)acylhydrazide]oxalic acid, dodecanoic acid bis[2-(2-hydroxybenzoyl)acylhydrazide], methylpyridinylhydrazide, diphenylazocarbonylhydrazide, p-dimethylaminobenzoylhydrazide, phenylcarbamoylhydrazide, 3,4,5-trimethoxybenzoylhydrazide, 1,2-dimethyl-1,2-diphenylcarbamoylhydrazide, malonic acid-1,3-di[2-methyl-2-(phenylthionylmethyl)acylhydrazide], (3R)-1-(2-methylalanyl-D-chromium) At least one of the following: (aminoyl)-3-benzylmethyl-3-piperidine 1,2,2-trimethylformylhydrazine, 4-benzyloxybenzoylhydrazine, 3,5-dihydroxybenzoylhydrazine, 3,4-dimethoxyphenylacetylhydrazine, 3-methyl-4-nitrobenzene-1-carbonylhydrazine, 3-benzyloxybenzoylhydrazine, 3-phenoxybenzoylhydrazine, 3,4-diaminobenzoylhydrazine, 3-aminobenzoylhydrazine, 3-methoxybenzoylhydrazine, 3-nitrobenzoylhydrazine, 3-ethoxybenzoylhydrazine, p-toluenecarboxylhydrazine, 2,4-dihydroxybenzoylhydrazine, methoxybenzoylhydrazine, benzo[b]thiophene-2-carboxylhydrazine, phenylacetylhydrazine, diphenyldihydrazine adipic acid, diphenyldihydrazine sebacate, and zinc phenyl phosphate.

18. The biodegradable composition according to claim 6, wherein, The antioxidant is a hindered phenolic antioxidant and / or a phosphite antioxidant, wherein the hindered phenolic antioxidant is selected from 2,6-di-tert-butyl-4-methylphenol, 1,1,3-tris(2-methyl-4-hydroxy-5-tert-butylphenyl)butane, pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], 2,2'-methylenebis(4-methyl-6-tert-butylphenol), 4,4'- Thiobis-[3-methyl-6-tert-butylphenol], 2,2'-thiobis-[4-methyl-6-tert-butylphenol], 1,3,5-bis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl]-hexahydrotriazine, tris(3,5-di-tert-butyl-4-hydroxybenzyl)-triisocyanate, N,N'-di(β-naphthyl)-p-phenylenediamine, N,N'-diphenyl-p-phenylenediamine, N-phenyl -N'-Cyclohexyl-p-phenylenediamine, dilaurate thiodipropionate, 2-mercaptobenzimidazole, 2-mercaptobenzothiazole, 1,3,5-tris(3,5-di-tert-butyl-4-hydroxybenzyl)isocyanuric acid, triethylene glycol bis[β-(3-tert-butyl-4-hydroxy-5-methylphenyl)propionate], and 1,3,5-trimethyl-2,4,6-tris(3,5-tert-butyl-4-hydroxybenzyl)benzene; the phosphite antioxidant is selected from at least one of triphenyl phosphite, trinonylphenyl phosphite, triethylene glycol bis[β-(3-tert-butyl-4-hydroxy-5-methylphenyl)propionate], bis(2,4-dicumylphenyl)pentaerythritol diphosphite, pentaerythritol dioctadecaphosphite, butylated hydroxytoluene (BHT), tert-butylhydroquinone (TBHQ), and the antioxidant Chinox. At least one of 20N, tris(2,4-di-tert-butylphenyl) phosphite, pentaerythritol distearate diphosphite, and antioxidant 2,2'-ethylidene di(4,6-di-tert-butylphenyl) fluorophosphite; preferably, the antioxidant is a mixture of hindered phenolic antioxidants and phosphite antioxidants in a mass ratio of 1:3 to 3:

1.

19. A biodegradable film, characterized in that, The film is formed from the biodegradable composition according to any one of claims 4-18.

20. The biodegradable film according to claim 19, wherein, The biodegradable film has a thickness of 5–100 μm, preferably 4–20 μm, a tensile breaking stress greater than 18 MPa, preferably 25–100 MPa, a longitudinal tensile strength of 18 MPa or more, preferably 24 MPa or more, a transverse tensile strength of 16 MPa or more, preferably 20 MPa or more, a longitudinal breaking nominal strain of 250% or more, preferably 300% or more, a transverse breaking nominal strain of 300% or more, preferably 350% or more, and a light transmittance of 89% or more.

21. The method for preparing the biodegradable film according to claim 19 or 20, characterized in that, Includes the following steps: (1) Biodegradable resin A, biodegradable resin B, bio-based elastomer C, aerogel compound fertilizer and additives are mixed and extruded and granulated to obtain a biodegradable resin composition containing fertilizer. (2) The biodegradable resin composition containing fertilizer is used to form a film to obtain the biodegradable film.

22. The preparation method according to claim 21, wherein, In step (1), the extrusion conditions include: a temperature of 50-200°C and a screw speed of 50-300 rpm, preferably 100-200 rpm.

23. The preparation method according to claim 21, wherein, In step (2), the film-forming method is blow molding; Preferably, the blow molding conditions include: a blown film temperature of 150-210℃, more preferably 160-200℃, and a blow-up ratio of 1.5-3:1, more preferably 2-2.5:

1.

24. The application of the biodegradable film according to claim 19 or 20 in agricultural mulch films.

Images