CN113004105A - Bionic bio-based coated fertilizer and preparation method thereof - Google Patents
Bionic bio-based coated fertilizer and preparation method thereof Download PDFInfo
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- CN113004105A CN113004105A CN202110187288.8A CN202110187288A CN113004105A CN 113004105 A CN113004105 A CN 113004105A CN 202110187288 A CN202110187288 A CN 202110187288A CN 113004105 A CN113004105 A CN 113004105A
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
- C05G5/00—Fertilisers characterised by their form
- C05G5/30—Layered or coated, e.g. dust-preventing coatings
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
- C05G3/00—Mixtures of one or more fertilisers with additives not having a specially fertilising activity
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
- C05G3/00—Mixtures of one or more fertilisers with additives not having a specially fertilising activity
- C05G3/40—Mixtures of one or more fertilisers with additives not having a specially fertilising activity for affecting fertiliser dosage or release rate; for affecting solubility
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Abstract
The invention discloses a preparation method of a bionic bio-based coated fertilizer, which comprises the following steps: adding agricultural and forestry wastes and an acid catalyst into a liquefying agent, uniformly mixing, reacting at the temperature of 130-165 ℃ for 0.5-2h under normal pressure, and cooling to room temperature to obtain bio-based polyol; ultrasonically dispersing and uniformly mixing the bio-based polyol and the nano modified particles to obtain nano modified liquefied bio-based polyol; uniformly mixing the nano modified liquefied bio-based polyol and an isocyanate compound under the action of a catalyst to obtain a nano modified bio-based coating material; spraying the nano modified bio-based coating material onto fertilizer particles preheated to 40-80 ℃ at a constant speed, and reacting to obtain a nano modified bio-based coated fertilizer; and (3) placing the nano modified bio-based coated fertilizer into a solution containing a low surface energy substance, assembling for 0.5-2h at 50-80 ℃, and drying to obtain the bionic bio-based coated fertilizer. The invention obviously improves the nutrient controlled-release period of the coated fertilizer, can prepare fertilizers in different controlled-release periods, and improves the utilization efficiency of the fertilizer.
Description
Technical Field
The invention relates to the field of fertilizers, in particular to a bionic bio-based coated fertilizer and a preparation method thereof.
Background
As a big agricultural country, China has a large demand for grains, and sufficient nutrients must be provided for obtaining high yield. The fertilizer has very important function for improving the grain yield, and can effectively increase the yield by 40-60%. However, the large and unreasonable application of chemical fertilizers also causes a series of problems, such as low utilization rate of nitrogen fertilizers, underground water pollution, soil hardening, quality reduction of agricultural products and the like. Therefore, coated nitrogen fertilizers that can meet the nutrient requirements of crops throughout their growth period have become the focus of current research. The coating materials which have been applied at present can be classified into inorganic mineral coating materials, organic polymer coating materials and environment-friendly coating materials.
The inorganic mineral coating type is to coat inorganic materials which are insoluble in water on the surface of solid fertilizer particles, mainly comprises sulfur, inorganic fertilizer, active minerals and the like, the materials have wide sources and low price, and cannot cause secondary pollution after being applied to soil, but the film materials have poor elasticity, are easy to be brittle and have general nutrient controlled-release effect, so that the requirement of crops on nutrients in the whole growth period is difficult to meet. The organic polymer coated fertilizer is prepared by coating organic polymer materials on the surfaces of fertilizer particles, the film materials are high in water resistance and good in controlled release effect, but most of the raw materials adopt petroleum-based polymers, the materials are high in price and non-renewable, and are difficult to degrade after being applied to soil, and along with the exhaustion of fossil resources and the improvement of the requirement of people on environmental protection, the research and development and application of natural agriculture and forestry wastes, starch, chitosan, polyvinyl alcohol and the like which are wide in source, low in price and renewable in resources and are degradable after being applied to soil become hot spots of current research.
The plant fiber is one of the most abundant natural resources on the earth, mainly comprises cellulose, hemicellulose and lignin, can obtain bio-based polyol with a large number of hydroxyl groups through proper reaction, and can replace non-renewable fossil fuel-based polyol. However, the prepared biological basement membrane material has poor water resistance, and the prepared coated nitrogen fertilizer has a general slow-release effect, so the research for improving the water resistance of the membrane material is a difficult point of the current research.
Disclosure of Invention
Aiming at solving the technical problems in the prior art, the invention carries out deep research, takes agricultural and forestry wastes as raw materials of a coating material to prepare a bio-based coated fertilizer, adopts a nano modification technology and a layer-by-layer self-assembly method to construct a hydrophobic surface on the surface of the coated fertilizer according to the bionics principle, forms a hydrophobic layer, obviously improves the controlled release period of nutrients of the coated fertilizer, can prepare fertilizers in different controlled release periods by adjusting the thickness and the proportion of a film material, can effectively improve the utilization efficiency of the fertilizers, meets the requirements of crops on the nutrients in the growth period, and has wide, cheap, renewable and environment-friendly raw materials. The present invention has been accomplished, at least in part, based on this. Specifically, the present invention includes the following.
The invention provides a preparation method of a bionic bio-based coated fertilizer, which comprises the following steps:
step one, adding agricultural and forestry wastes and an acid catalyst into a liquefying agent, uniformly mixing, reacting at the temperature of 130-165 ℃ for 0.5-2h under normal pressure, and cooling to room temperature to obtain bio-based polyol;
step two, ultrasonically dispersing and uniformly mixing the bio-based polyol and the nano modified particles to obtain nano modified liquefied bio-based polyol;
step three, uniformly mixing the nano modified liquefied bio-based polyol and an isocyanate compound under the action of a catalyst to obtain a nano modified bio-based coating material;
step four, spraying the nano modified bio-based coating material onto fertilizer particles preheated to 40-80 ℃ at a constant speed, and reacting to obtain the nano modified bio-based coated fertilizer;
and step five, putting the nano modified bio-based coated fertilizer into a solution containing a low surface energy substance, assembling for 0.5-2h at 50-80 ℃, and drying to obtain the bionic bio-based coated fertilizer.
In certain exemplary embodiments, the liquefying agent is a mixture of polyethylene glycol and a low molecular weight polyol in a mass ratio of 1:1 to 9: 1; wherein the polyethylene glycol is one or more of polyethylene glycol 400 (average relative molecular mass of 400), polyethylene glycol 600 (average relative molecular mass of 600), and polyethylene glycol 800 (average relative molecular mass of 800); the low molecular weight polyol is ethylene glycol or glycerol.
Preferably, the preparation method of the liquefying agent comprises the following steps:
mixing polyethylene glycol and low molecular weight polyol in proportion, heating to 85-100 ℃, and stirring at the speed of 150-300 r/min.
In certain exemplary embodiments, the liquefying agent, the agricultural and forestry waste, and the acid catalyst are used in amounts of 300 parts by weight, 60 parts by weight to 80 parts by weight, and 10 parts by weight to 15 parts by weight, respectively.
In certain exemplary embodiments, the agricultural and forestry waste is at least one of corn stover, rice stover, wheat straw, mushroom dregs, dry branches and fallen leaves, and the agricultural and forestry waste has a particle size of 60-100 mesh.
In certain exemplary embodiments, the acid catalyst is an inorganic acid and is at least one of sulfuric acid, phosphoric acid, and hydrochloric acid.
In certain exemplary embodiments, the bio-based polyol and the nano-modified particles are used in amounts of 98 to 99.5 parts, 0.5 to 2 parts, respectively, by weight; the nano modified particles are one or more of nano silicon dioxide, nano antimony dioxide, nano montmorillonite and nano attapulgite.
In certain exemplary embodiments, the isocyanate-based compound is one of polyphenyl polyisocyanate (PM200), Toluene Diisocyanate (TDI), diphenylmethane diisocyanate (MDI); the catalyst is dibutyltin dilaurate.
In certain exemplary embodiments, the low surface energy material is one or more of heptadecafluorodecyltrimethoxysilane, perfluorodecyltriethoxysilane, polydimethylsiloxane; the solution containing the low surface energy substance is one or more of n-hexane, n-propanol, n-pentanol and n-octanol.
Preferably, the volume ratio of the low surface energy substance in the solution is 0.5% to 2%.
In certain exemplary embodiments, the amount of the nano-modified bio-based coating material is 5% to 9% of the total amount of the fertilizer granules and the nano-modified bio-based coating material. The dosage ratio of the nano modified bio-based coating material to the fertilizer granules ensures that the coating on the surface of the fertilizer granules is not too thin and incomplete in film formation, and is not too thick to influence the controlled release period, thereby effectively controlling the controlled release period of the fertilizer. In the range, the coating thickness is adjusted by adjusting the dosage ratio, so that the requirement of crops on nutrients in the growth period is met, the fertilizer is suitable for different varieties of crops, and the utilization efficiency of the fertilizer can be effectively improved.
In a second aspect of the invention, a bionic type bio-based coated fertilizer is provided, and the bionic type bio-based coated fertilizer is prepared by the method in the first aspect of the invention.
Compared with the prior art, the invention has the following beneficial effects:
(1) the invention takes the agricultural and forestry wastes as the raw materials of the coating material to prepare the bio-based coated fertilizer, the raw materials are wide and easy to obtain, low in price and renewable, the problem of environmental pollution caused by the agricultural and forestry wastes can be solved, the combination of slow release and release promotion can be achieved by adjusting the coating thickness, the dosage of the nano modifier, the assembly condition, the preparation process and the like, the requirement of crops on nutrients in the whole growth period can be met, and the manufacturing cost is greatly reduced.
(2) The film material prepared by the invention has moderate viscosity, is not easy to adhere in the coating process, has good film forming effect and complete coating, and further has good slow release effect of the fertilizer.
(3) The preparation method is simple, and the coating process has no pollution to the environment.
Drawings
FIG. 1 is an infrared spectrum of the nano-modified bio-based coated nitrogen fertilizer film shell and the biomimetic bio-based coated nitrogen fertilizer film shell prepared in example 1.
FIG. 2a is a surface microstructure diagram of a nano-modified bio-based coated nitrogen fertilizer shell prepared in example 1.
FIG. 2b is a sectional microstructure diagram of the nano-modified bio-based coated nitrogen fertilizer shell prepared in example 1.
FIG. 2c is a surface microstructure diagram of the bionic bio-based coated nitrogen fertilizer shell prepared in example 1.
FIG. 2d is a sectional microstructure diagram of the bionic bio-based coated nitrogen fertilizer shell prepared in example 1.
Detailed Description
Reference will now be made in detail to various exemplary embodiments of the invention, the detailed description should not be construed as limiting the invention but as a more detailed description of certain aspects, features and embodiments of the invention.
It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Further, for numerical ranges in this disclosure, it is understood that the upper and lower limits of the range, and each intervening value therebetween, is specifically disclosed. Every smaller range between any stated value or intervening value in a stated range and any other stated or intervening value in a stated range is encompassed within the invention. The upper and lower limits of these smaller ranges may independently be included or excluded in the range.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Although only preferred methods and materials are described herein, any methods and materials similar or equivalent to those described herein can be used in the practice or testing of the present invention. All documents mentioned in this specification are incorporated by reference herein for the purpose of disclosing and describing the methods and/or materials associated with the documents. In case of conflict with any incorporated document, the present specification will control.
Bionics means that substances with corresponding properties are prepared by simulating the structure and function of a certain part of an organism, for example, a super-hydrophobic surface material is prepared by using lotus leaf, water strider leg and the like with a super-hydrophobic function as a bionic object, and at present, the preparation method of the bionic hydrophobic surface mainly adopts a combination mode of increasing the roughness of the surface of the material and reducing the surface energy. But is not currently applied in the field of coated fertilizers. Therefore, the invention prepares the bio-based polyol coating material by taking agricultural and forestry wastes, namely corn straws, rice straws, wheat straws, mushroom dregs and dry branches and fallen leaves, which are widely available and cheap as raw materials, prepares the bionic bio-based coated fertilizer by a nano modification technology and a layer-by-layer self-assembly method according to the bionics principle, builds a hydrophobic surface on the surface of the coated fertilizer to form a hydrophobic layer, obviously improves the nutrient controlled-release period of the coated fertilizer, can prepare fertilizers in different controlled-release periods by adjusting the thickness and the proportion of a film material, can effectively improve the utilization efficiency of the fertilizer, meets the requirements of crops in the growth period on nutrients, obtains the coated fertilizer with good effect, and provides a new method for solving the problem of shortage of the existing petrochemical engineering base raw materials and the preparation and application of an environment-friendly slow-.
Example 1
The embodiment is a preparation example of an exemplary bionic bio-based coated fertilizer, and specifically the preparation method comprises the following steps:
step one, mixing polyethylene glycol and glycerol according to the mass ratio of 9:1, adding the mixture into a three-neck reaction kettle with a stirrer, a heating device and a condensing tube, heating to 90 ℃, and stirring at the speed of 150 revolutions per minute to obtain a liquefying agent; adding 80 parts of bacterial residues crushed to 60 meshes and 10 parts of concentrated sulfuric acid into 400 parts of a liquefying agent, uniformly mixing, heating to 165 ℃ under normal pressure, reacting for 1h, and cooling to room temperature to obtain bio-based polyol;
ultrasonically dispersing 98 parts of bio-based polyol and 2 parts of nano silicon dioxide liquid for 20-30min, and uniformly mixing to obtain nano modified liquefied bio-based polyol;
step three, uniformly mixing 3.5 parts of the nano modified liquefied bio-based polyol obtained in the step two and 6.5 parts of polyphenyl polyisocyanate under the catalysis of dibutyltin dilaurate to obtain a nano modified bio-based coating material;
adding 910 parts of large-particle urea with the diameter of 2-5mm into a rotary drum granulator, preheating for 20min at 60 ℃, spraying 10 parts of the nano modified bio-based coating material obtained in the third step into the rotary drum granulator at a constant speed, reacting for 3-5min, coating, solidifying and forming a film on urea particles, repeatedly adding the nano modified bio-based coating material and spraying for 9 times, and cooling to room temperature to obtain a nano modified bio-based coating nitrogen fertilizer with the coating thickness of about 9%;
and fifthly, putting the nano modified bio-based coated nitrogen fertilizer into a normal hexane solution containing 2% by volume of heptadecafluorodecyltrimethoxysilane, assembling for 2 hours at 80 ℃, taking out the coated fertilizer, and drying for 1 hour at 60 ℃ to obtain the bionic bio-based coated nitrogen fertilizer.
The coating thickness of the coated nitrogen fertilizer prepared by the embodiment is about 9%, and the nutrient controlled release period is about 55 days through tests.
Example 2
The embodiment is a preparation example of an exemplary bionic bio-based coated fertilizer, and specifically the preparation method comprises the following steps:
step one, mixing polyethylene glycol and glycerol according to the mass ratio of 1:1, adding the mixture into a three-neck reaction kettle with a stirrer, a heating device and a condensing tube, heating to 85 ℃, and stirring at the speed of 170 revolutions per minute to obtain a liquefying agent; adding 75 parts of crushed dry branches and fallen leaves of 100 meshes and 10 parts of concentrated sulfuric acid into 400 parts of a liquefying agent, uniformly mixing, heating to 130 ℃ under normal pressure for reaction for 50min, and cooling to room temperature to obtain bio-based polyol;
step two, ultrasonically dispersing 99.5 parts of bio-based polyol and 0.5 part of nano silicon dioxide liquid for 25min, and uniformly mixing to obtain nano modified liquefied bio-based polyol;
step three, uniformly mixing 3.5 parts of the nano modified liquefied bio-based polyol obtained in the step two and 6.5 parts of diphenylmethane diisocyanate under the catalytic action of dibutyltin dilaurate to obtain a nano modified bio-based coating material;
adding 950 parts of large-particle urea with the diameter of 2-5mm into a rotary drum granulator, preheating for 20min at 80 ℃, spraying 10 parts of the nano modified bio-based coating material obtained in the third step into the rotary drum granulator at a constant speed, reacting for 3-5min, coating, solidifying and forming a film on urea particles, repeatedly adding the nano modified bio-based coating material and spraying for 5 times, and cooling to room temperature to obtain a nano modified bio-based coating nitrogen fertilizer with the coating thickness of about 5%;
and fifthly, putting the nano modified bio-based coated nitrogen fertilizer into a normal hexane solution containing 0.5 volume percent of perfluorodecyl triethoxysilane, assembling for 1h at 60 ℃, taking out the coated fertilizer, and drying for 1h at 60 ℃ to obtain the bionic bio-based coated nitrogen fertilizer.
The thickness of the coating of the coated nitrogen fertilizer prepared by the embodiment is about 5%, and the nutrient controlled release period is about 10 days through tests.
Example 3
The embodiment is a preparation example of an exemplary bionic bio-based coated fertilizer, and specifically the preparation method comprises the following steps:
step one, mixing polyethylene glycol and glycerol according to the mass ratio of 7:1, adding the mixture into a three-neck reaction kettle with a stirrer, a heating device and a condensing tube, heating to 85 ℃, and stirring at the speed of 170 revolutions per minute to obtain a liquefying agent; adding 75 parts of corn straw crushed to 80 meshes and 15 parts of concentrated sulfuric acid into 400 parts of a liquefying agent, uniformly mixing, heating to 160 ℃ under normal pressure, reacting for 1h, and cooling to room temperature to obtain bio-based polyol;
step two, ultrasonically dispersing 99 parts of bio-based polyol and 1 part of nano silicon dioxide liquid for 30min, and uniformly mixing to obtain nano modified liquefied bio-based polyol;
step three, uniformly mixing 3.5 parts of the nano modified liquefied bio-based polyol obtained in the step two and 6.5 parts of diphenylmethane diisocyanate under the catalytic action of dibutyltin dilaurate to obtain a nano modified bio-based coating material;
adding 930 parts of large-particle urea with the diameter of 2-5mm into a rotary drum granulator, preheating for 20min at 60 ℃, spraying 10 parts of the nano modified bio-based coating material obtained in the third step into the rotary drum granulator at a constant speed, reacting for 3-5min, coating, solidifying and forming a film on urea particles, repeatedly adding the nano modified bio-based coating material and spraying for 7 times, and cooling to room temperature to obtain a nano modified bio-based coating nitrogen fertilizer with the coating thickness of about 7%;
and fifthly, putting the nano modified bio-based coated nitrogen fertilizer into a normal hexane solution containing 1.5 volume percent of perfluorodecyl triethoxysilane, assembling for 1h at 60 ℃, taking out the coated fertilizer, and drying for 1h at 60 ℃ to obtain the bionic bio-based coated nitrogen fertilizer.
The thickness of the coating of the coated nitrogen fertilizer prepared by the embodiment is about 7%, and the nutrient controlled release period is about 30 days through tests.
FIG. 1 is an infrared spectrum of the nano-modified bio-based coated nitrogen fertilizer film shell and the biomimetic bio-based coated nitrogen fertilizer film shell prepared in example 1. As shown in figure 1, compared with the nano modified bio-based coated nitrogen fertilizer film shell, the bionic bio-based coated nitrogen fertilizer film shell is 3275cm-1The water-absorbing hydroxyl group of (2) disappears at 1050cm-1And 810cm-1At which Si-O and O-Si-O appear, at 1123cm-1C-F bonds appear at the positions, which indicates the successful preparation of the bionic bio-based coated nitrogen fertilizer.
FIG. 2a is a surface microstructure diagram of a nano-modified bio-based coated nitrogen fertilizer shell prepared in example 1. FIG. 2b is a sectional microstructure diagram of the nano-modified bio-based coated nitrogen fertilizer shell prepared in example 1. FIG. 2c is a microscopic structure diagram illustrating the membrane shell of the bio-based coated nitrogen fertilizer prepared in example 1. FIG. 2d is a sectional microstructure diagram of the bionic bio-based coated nitrogen fertilizer shell prepared in example 1. In FIG. 2a, the surface of the bio-based coated nitrogen fertilizer film shell is relatively flat, and micropores appear on the surface; in FIG. 2b, the cross section of the bio-based coated nitrogen fertilizer shell has a plurality of porous structures. After biomimetic modification, as shown in fig. 2c, a micro-nano structure similar to the lotus leaf surface is constructed on the surface of the membrane shell, and as shown in fig. 2d, the cross-sectional structure of the membrane shell is compact, so that a good hydrophobic structure is formed.
Therefore, the bionic hydrophobic surface is prepared on the surface of the coated fertilizer, and the hydrophobic layer is constructed in a mode of combining surface roughness increasing and surface energy reducing, so that the nutrient controlled release period of the coated fertilizer is obviously prolonged. Compared with the examples 1-3, the invention can prepare the fertilizers in different controlled release periods by adjusting the thickness and the proportion of the film material, effectively improve the utilization efficiency of the fertilizers and meet the requirements of crops on nutrients in the growth period.
The dosage of the nano modified bio-based coating material is 5-9% of the total dosage of the fertilizer particles and the nano modified bio-based coating material, the incomplete coating of the fertilizer particles can not be caused, the limited controlled release effect caused by too thin coating can not be caused, and the condition that the optimal nutrient supply period of crops is missed because the coating is too thick and is difficult to release nutrients can not be caused. The nutrient control period of the bionic bio-based coated fertilizer prepared by the invention is 1-2 months, the bionic bio-based coated nitrogen fertilizer with corresponding controlled release period can be prepared by adjusting different proportions to meet the requirements of different crops on nutrients, and the utilization efficiency of the fertilizer can be effectively improved.
While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. Many modifications and variations may be made to the exemplary embodiments of the present description without departing from the scope or spirit of the present invention. The scope of the claims is to be accorded the broadest interpretation so as to encompass all modifications and equivalent structures and functions.
Claims (10)
1. A preparation method of a bionic bio-based coated fertilizer is characterized by comprising the following steps:
step one, adding agricultural and forestry wastes and an acid catalyst into a liquefying agent, uniformly mixing, reacting at the temperature of 130-165 ℃ for 0.5-2h under normal pressure, and cooling to room temperature to obtain bio-based polyol;
step two, ultrasonically dispersing and uniformly mixing the bio-based polyol and the nano modified particles to obtain nano modified liquefied bio-based polyol;
step three, uniformly mixing the nano modified liquefied bio-based polyol and an isocyanate compound under the action of a catalyst to obtain a nano modified bio-based coating material;
step four, spraying the nano modified bio-based coating material onto fertilizer particles preheated to 40-80 ℃ at a constant speed, and reacting to obtain the nano modified bio-based coated fertilizer;
and step five, putting the nano modified bio-based coated fertilizer into a solution containing a low surface energy substance, assembling for 0.5-2h at 50-80 ℃, and drying to obtain the bionic bio-based coated fertilizer.
2. The preparation method of the bionic bio-based coated fertilizer as claimed in claim 1, wherein the liquefying agent is a mixture of polyethylene glycol and low molecular weight polyol, and the mass ratio of the polyethylene glycol to the low molecular weight polyol is 1:1-9: 1; wherein the polyethylene glycol is one or more of polyethylene glycol 400, polyethylene glycol 600 and polyethylene glycol 800; the low molecular weight polyol is ethylene glycol or glycerol.
3. The preparation method of the bionic bio-based coated fertilizer as claimed in claim 1, wherein the amounts of the liquefying agent, the agricultural and forestry waste and the acid catalyst are respectively 300-400 parts, 60-80 parts and 10-15 parts by weight.
4. The preparation method of the bionic bio-based coated fertilizer as claimed in claim 1, wherein the agricultural and forestry waste is at least one of corn stalks, rice stalks, wheat stalks, mushroom dregs and dry branches and leaves, and the particle size of the agricultural and forestry waste is 60-100 meshes.
5. The method for preparing the bionic bio-based coated fertilizer as claimed in claim 1, wherein the acid catalyst is an inorganic acid and is at least one of sulfuric acid, phosphoric acid and hydrochloric acid.
6. The preparation method of the bionic bio-based coated fertilizer as claimed in claim 1, wherein the dosages of the bio-based polyol and the nano modified particles are respectively 98-99.5 parts and 0.5-2 parts by weight; the nano modified particles are one or more of nano silicon dioxide, nano antimony dioxide, nano montmorillonite and nano attapulgite.
7. The method for preparing the bionic bio-based coated fertilizer as claimed in claim 1, wherein the isocyanate compound is one of polyphenyl polyisocyanate, toluene diisocyanate and diphenylmethane diisocyanate; the catalyst is dibutyltin dilaurate.
8. The preparation method of the bionic bio-based coated fertilizer as claimed in claim 1, wherein the low surface energy substance is one or more of heptadecafluorodecyltrimethoxysilane, perfluorodecyltriethoxysilane and polydimethylsiloxane; the solution containing the low surface energy substance is one or more of n-hexane, n-propanol, n-pentanol and n-octanol.
9. The method for preparing the bionic bio-based coated fertilizer as claimed in claim 1, wherein the amount of the nano modified bio-based coating material is 5% -9% of the total amount of the fertilizer granule and the nano modified bio-based coating material.
10. A biomimetic bio-based coated fertilizer, characterized in that the biomimetic bio-based coated fertilizer is prepared by the method according to any one of claims 1-9.
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| WO2023109674A1 (en) * | 2021-12-13 | 2023-06-22 | 北京市农林科学院 | Bio-based polyol for polyurethane, coating liquid and coated controlled release fertilizer thereof |
| CN114478131A (en) * | 2022-02-15 | 2022-05-13 | 安徽省农业科学院棉花研究所 | Special compound biological fertilizer for promoting growth of hot pepper and preparation method thereof |
| CN116162002A (en) * | 2022-12-09 | 2023-05-26 | 中科（淮安）新能源技术开发有限公司 | Preparation method of bio-based polyurethane-modified attapulgite composite coated slow release fertilizer |
| CN117586072A (en) * | 2023-11-29 | 2024-02-23 | 中国热带农业科学院南亚热带作物研究所 | Multiple modified starch-based waterborne polyurethane coated fertilizer and preparation method thereof |
| CN117586072B (en) * | 2023-11-29 | 2024-06-18 | 中国热带农业科学院南亚热带作物研究所 | Multiple modified starch-based waterborne polyurethane coated fertilizer and preparation method thereof |
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