CN113880653B - Slow-release fertilizer containing compound amino acid - Google Patents
Slow-release fertilizer containing compound amino acid Download PDFInfo
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- CN113880653B CN113880653B CN202111130084.7A CN202111130084A CN113880653B CN 113880653 B CN113880653 B CN 113880653B CN 202111130084 A CN202111130084 A CN 202111130084A CN 113880653 B CN113880653 B CN 113880653B
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05B—PHOSPHATIC FERTILISERS
- C05B1/00—Superphosphates, i.e. fertilisers produced by reacting rock or bone phosphates with sulfuric or phosphoric acid in such amounts and concentrations as to yield solid products directly
- C05B1/02—Superphosphates
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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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- 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
- C05G3/90—Mixtures of one or more fertilisers with additives not having a specially fertilising activity for affecting the nitrification of ammonium compounds or urea in the soil
-
- 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
- C05G5/10—Solid or semi-solid fertilisers, e.g. powders
- C05G5/12—Granules or flakes
-
- 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
- C05G5/37—Layered or coated, e.g. dust-preventing coatings layered or coated with a polymer
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
- Y02A40/10—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
- Y02A40/22—Improving land use; Improving water use or availability; Controlling erosion
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P60/00—Technologies relating to agriculture, livestock or agroalimentary industries
- Y02P60/20—Reduction of greenhouse gas [GHG] emissions in agriculture, e.g. CO2
- Y02P60/21—Dinitrogen oxide [N2O], e.g. using aquaponics, hydroponics or efficiency measures
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- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Pest Control & Pesticides (AREA)
- Soil Sciences (AREA)
- Fertilizers (AREA)
Abstract
The invention discloses a slow release fertilizer containing compound amino acid, belonging to the technical field of fertilizers. And the slow release fertilizer comprises the following raw materials: fertilizer effect granules and coating solution; the coating solution comprises the following components: chitosan and water are fortified. The invention utilizes the reinforced chitosan as the coating agent of the slow release fertilizer, and solves the technical problem of weak controlled release capacity caused by insufficient coating strength formed by the conventional coating agent of the slow release fertilizer; according to the invention, the rice husk carbon is utilized to carry out enhanced modification on chitosan, the surface of the pyrolyzed rice husk carbon contains a large number of pore structures, and no hydroxyl group exists on the surface of the rice husk carbon, so that the rice husk carbon has good dispersibility in the hydrophobically modified chitosan, and in the extrusion process, a molecular chain or an alkyl chain of the hydrophobically modified chitosan can be embedded in the pore structures on the surface of the rice husk carbon, so that the flowing and the expansion of the molecular chain of the hydrophobically modified chitosan are hindered, the mechanical property of the chitosan is enhanced, and the controlled release capability of the chitosan is enhanced.
Description
Technical Field
The invention belongs to the technical field of fertilizers, and particularly relates to a slow-release fertilizer containing compound amino acid.
Background
At present, wheat, corn, rice, rape, flowers and the like which are crops are mostly used as fertilizers, and single nitrogen fertilizers or compound fertilizers containing only nitrogen, phosphorus and potassium are mostly used. The fertilizer has single nutrient component and no slow release function, is decomposed quickly after being applied, only a small amount of the fertilizer is absorbed by crops, the utilization rate of the fertilizer is low, and other nutrients are volatilized or washed and lost by rainwater to enter rivers or lakes, so that eutrophication pollution of water bodies of the rivers or the lakes can be easily caused for a long time. In order to solve the above problems, the use of a slow release fertilizer can preferably solve the above problems.
However, most of the existing slow release fertilizers have good quality, the coating agents used by the slow release fertilizers are often organic resin compounds, the degradation performance of the resins is poor, the secondary pollution of soil is easy to cause, and some coating agents selected from chitosan, gelatin and trehalose have the problems of poor controlled release capability and short slow release time due to poor mechanical performance of the film. Therefore, a coating agent which is environment-friendly and has good sustained-release capability is needed.
In addition, the compound amino acid is introduced into the formula fertilizer, so that the effect of the formula fertilizer can be effectively improved, and the effects of reducing the residue of inorganic fertilizer in soil and water systems, reducing soil hardening and the like are achieved.
Therefore, the invention provides a slow release fertilizer containing compound amino acid.
Disclosure of Invention
The invention aims to provide a slow release fertilizer containing compound amino acid.
The technical problems to be solved by the invention are as follows: the technical problem of weak controlled release capability caused by insufficient coating strength formed by the coating agent of the existing slow release fertilizer.
The purpose of the invention can be realized by the following technical scheme:
a slow release fertilizer containing compound amino acid comprises the following raw materials in parts by weight: 95-115 parts of fertilizer effect particles and 25-45 parts of coating solution.
Further, the fertilizer effect particles comprise the following raw materials in parts by weight: 1.5-4.5 parts of compound amino acid, 12-23 parts of urea, 6-16 parts of phosphate fertilizer, 5-13.5 parts of potash fertilizer and 0.1-0.5 part of trace elements.
Further, the compound amino acid is compound amino acid powder.
Further, the phosphate fertilizer is calcium superphosphate and fishbone powder according to the mass ratio of 2-5: 0.5-1.5.
Further, the potash fertilizer is composed of potassium chloride and potassium dihydrogen phosphate according to a mass ratio of 1-3: 1.5-3.
Further, the trace elements are the combination of zinc, selenium, manganese and molybdenum compounds in any ratio.
Further, the fertilizer effect particles are prepared by the following steps:
a1, dissolving compound amino acid in water to obtain 60-80% of compound amino acid by mass fraction, and performing spray drum granulation to obtain compound amino acid particles, wherein the particle size of the compound amino acid particles is controlled to be 1-2mm;
a2, dissolving urea, phosphate fertilizer, potash fertilizer and trace elements in water to obtain mixed liquor a with the solid mass fraction of 75-85%; and then placing the compound amino acid particles in a spray drum granulator, spraying the mixed solution a on the surfaces of the compound amino acid particles in a rotating state, drying and curing to obtain fertilizer effect particles, wherein the particle size of the fertilizer effect particles is controlled to be 2.5-3mm.
Further, the coating solution comprises the following components in parts by weight: 20-45 parts of reinforced chitosan, 85-100 parts of water and 2.5-4.5 parts of tween 20, and is prepared by the following method: adding the reinforced chitosan and the Tween 20 into water, and uniformly stirring at 300-500r/min to obtain a coating solution.
Further, the reinforced chitosan is prepared by the following steps:
b1, adding an ethanol solution containing succinic anhydride into a chitosan solution with the mass fraction of 20-35%, stirring and reacting for 8 hours at 65 ℃, then transferring the reaction solution into a dialysis bag with the cut-off molecular weight of 5000, dialyzing for 3 days with deionized water, and drying in vacuum at 0 ℃ to obtain the acylated chitosan, wherein the dosage ratio of the chitosan to the succinic anhydride is 100g:17-32g;
b2, preparing the acylated chitosan into a water-methanol solution (the volume ratio of water to methanol is 1: 11-17:20-40;
and B3, adding the hydrophobically modified chitosan and the dried rice husk carbon into a double-screw extruder, granulating and grinding to obtain the reinforced chitosan, wherein the extrusion temperature zone of the double-screw extruder is divided into four zones, the temperature of the first zone is 70-75 ℃, the temperature of the second zone is 75-80 ℃, the temperature of the third zone is 80-90 ℃, the temperature of the fourth zone is 90-100 ℃, and the mass ratio of the hydrophobically modified chitosan to the rice husk carbon is 100:17-28.
A slow release fertilizer containing compound amino acid is prepared by the following method:
and (3) putting the fertilizer effect granules into a spray drum granulator, coating the coating solution on the surfaces of the fertilizer effect granules in a rotating state, and drying in a drying oven at 30 ℃ to obtain the slow release fertilizer containing the compound amino acid, wherein the particle size of the slow release fertilizer granules is controlled to be 4-6mm.
The invention has the beneficial effects that:
1. the invention utilizes the reinforced chitosan as the coating agent of the slow release fertilizer, and solves the technical problem of weak controlled release capacity caused by insufficient coating strength formed by the conventional coating agent of the slow release fertilizer; the invention relates to a method for strengthening and modifying chitosan by using rice husk carbon, which comprises the steps of firstly carrying out acylation modification on chitosan, introducing carboxyl, then utilizing the reaction of the carboxyl and amino in hexylamine, adding alkyl chains into the chitosan, increasing the hydrophobic structure of the chitosan, carrying out hydrophobic modification on the chitosan, and then carrying out blending extrusion on the rice husk carbon and the hydrophobic modified chitosan to finish the strengthening and modification, wherein the surface of the rice husk carbon subjected to pyrolysis treatment contains a large number of pore structures, and the surface of the rice husk carbon does not contain hydroxyl groups, so that the rice husk carbon has good dispersibility in the hydrophobic modified chitosan, and in the extrusion process, the molecular chain or alkyl chain of the hydrophobic modified chitosan can be embedded in the pore structures on the surface of the rice husk carbon, thereby hindering the flow and expansion of the molecular chain of the modified chitosan, further enhancing the mechanical property of the chitosan, and improving the controlled release capacity of the strengthened chitosan;
2. the structure of the slow release fertilizer containing the compound amino acid has the following characteristics: the structure that the compound amino acid is used as a core, the mixture of urea, phosphate fertilizer, potash fertilizer and trace elements is used as an intermediate layer, and the reinforced chitosan is used as an outer layer ensures that the amino acid is released all the time in the slow release process of the slow release fertilizer.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1:
the reinforced chitosan is prepared by the following steps:
b1, adding 50mL of ethanol solution containing 17g of succinic anhydride into 500g of 20% chitosan solution, stirring and reacting for 8 hours at 65 ℃, then transferring the reaction solution into a dialysis bag with cut-off molecular weight of 5000, dialyzing for 3 days with deionized water, and drying in vacuum at 0 ℃ to obtain acylated chitosan;
b2, preparing 100g of acylated chitosan into 500g of a water-methanol solution (the volume ratio of water to methanol is 1);
and B3, adding 100g of hydrophobically modified chitosan and 17g of dried rice hull carbon into a double-screw extruder, granulating and grinding to obtain the reinforced chitosan, wherein the extrusion temperature zone of the double-screw extruder is divided into four zones, the temperature of the first zone is 70 ℃, the temperature of the second zone is 75 ℃, the temperature of the third zone is 80 ℃, and the temperature of the fourth zone is 90 ℃.
Example 2:
the reinforced chitosan is prepared by the following steps:
b1, adding 50mL of ethanol solution containing 32g of succinic anhydride into 285.8g of chitosan solution with the mass fraction of 35%, stirring and reacting for 8 hours at 65 ℃, then transferring the reaction solution into a dialysis bag with the cut-off molecular weight of 5000, dialyzing for 3 days by using deionized water, and drying in vacuum at 0 ℃ to obtain acylated chitosan;
b2, preparing 285.8g of water-methanol solution with the mass fraction of 35% (volume ratio of water to methanol is 1;
and B3, adding 100g of hydrophobically modified chitosan and 28g of dried rice husk carbon into a double-screw extruder, granulating and grinding to obtain the reinforced chitosan, wherein the extrusion temperature zone of the double-screw extruder is divided into four zones, the temperature of the first zone is 75 ℃, the temperature of the second zone is 80 ℃, the temperature of the third zone is 90 ℃, and the temperature of the fourth zone is 100 ℃.
Example 3:
preparation of coating solution: weighing 20g of the reinforced chitosan prepared in example 1, 85g of water and 2.5g of tween 20; then adding the reinforced chitosan and the Tween 20 into water, and uniformly stirring at 300r/min to obtain a coating solution.
Example 4:
preparation of coating solution: weighing 30g of the reinforced chitosan prepared in example 2, 90g of water and 3g of tween 20; then adding the reinforced chitosan and Tween 20 into water, and uniformly stirring at 500r/min to obtain a coating solution.
Example 5:
preparation of coating solution: weighing 45g of the reinforced chitosan prepared in example 1, 100g of water and 4.5g of tween 20; then adding the reinforced chitosan and Tween 20 into water, and uniformly stirring at 300r/min to obtain a coating solution.
Example 6:
the fertilizer effect particles are prepared by the following steps:
a1, weighing the following raw materials by weight: 1.5g of compound amino acid (compound amino acid powder), 12g of urea, 6g of phosphate fertilizer, 5g of potash fertilizer and 0.1g of trace elements; the phosphate fertilizer is calcium superphosphate and fishbone powder according to the mass ratio of 2:0.5 mixing; the potash fertilizer is composed of potassium chloride and potassium dihydrogen phosphate according to a mass ratio of 1:1.5 mixing; the trace elements are zinc sulfate heptahydrate, manganese sulfate and ammonium molybdate in a mass ratio of 1:1:1, mixing line composition;
a2, dissolving the compound amino acid in water to obtain 60% of compound amino acid by mass percent, and performing spray drum granulation to obtain compound amino acid particles, wherein the particle size of the compound amino acid particles is controlled to be 1mm;
a3, dissolving urea, phosphate fertilizer, potash fertilizer and trace elements in water to obtain mixed liquor a with the solid mass fraction of 75%; and then placing the compound amino acid particles in a spray drum granulator, spraying the mixed solution a on the surfaces of the compound amino acid particles in a rotating state, drying and curing to obtain fertilizer effect particles, wherein the particle size of the fertilizer effect particles is controlled to be 2.5mm.
Example 7:
the fertilizer effect particles are prepared by the following steps:
a1, weighing the following raw materials by weight: 4.5g of compound amino acid (compound amino acid powder), 23g of urea, 16g of phosphate fertilizer, 13.5g of potash fertilizer and 0.5g of trace elements; the phosphate fertilizer is calcium superphosphate and fishbone powder according to a mass ratio of 5:1.5 mixing; the potash fertilizer is composed of potassium chloride and monopotassium phosphate according to a mass ratio of 3:2, mixing; the trace elements are zinc sulfate heptahydrate, borax, manganese sulfate and ammonium molybdate according to a mass ratio of 1:1:1:1, mixing line composition;
a2, dissolving the compound amino acid in water to obtain compound amino acid with the mass fraction of 80%, and performing spray drum granulation to obtain compound amino acid particles, wherein the particle size of the compound amino acid particles is controlled to be 2mm;
a3, dissolving urea, phosphate fertilizer, potash fertilizer and trace elements in water to obtain mixed liquor a with the solid mass fraction of 85%; and then placing the compound amino acid particles in a spray drum granulator, spraying the mixed solution a on the surfaces of the compound amino acid particles in a rotating state, drying and curing to obtain fertilizer effect particles, wherein the particle size of the fertilizer effect particles is controlled to be 3mm.
Example 8:
a slow release fertilizer containing compound amino acid is prepared by the following steps:
step one, weighing the following raw materials by weight: 95g of the fertilizer granules prepared in example 6, 25g of the coating solution prepared in example 3;
and step two, placing the fertilizer effect particles in a spray drum granulator, coating the coating solution on the surfaces of the fertilizer effect particles in a rotating state, and drying in a drying oven at the temperature of 30 ℃ to obtain the slow release fertilizer containing the compound amino acid, wherein the particle size of the slow release fertilizer particles is controlled to be 4mm.
Example 9:
a slow release fertilizer containing compound amino acid is prepared by the following steps:
step one, weighing the following raw materials by weight: 105g of the fertilizer granules prepared in example 7, 35g of the coating solution prepared in example 4;
and step two, placing the fertilizer effect particles in a spray drum granulator, coating the coating solution on the surfaces of the fertilizer effect particles in a rotating state, and drying in a drying oven at the temperature of 30 ℃ to obtain the slow release fertilizer containing the compound amino acid, wherein the particle size of the slow release fertilizer particles is controlled to be 5mm.
Example 10:
a slow release fertilizer containing compound amino acid is prepared by the following steps:
step one, weighing the following raw materials by weight: 115g of fertilizer granules prepared in example 6, 45g of coating solution prepared in example 5;
and step two, placing the fertilizer effect particles in a spray drum granulator, coating the coating solution on the surfaces of the fertilizer effect particles in a rotating state, and drying in a drying oven at the temperature of 30 ℃ to obtain the slow release fertilizer containing the compound amino acid, wherein the particle size of the slow release fertilizer particles is controlled to be 6mm.
Comparative example 1:
preparation of coating solution: weighing 20g of chitosan, 85g of water and 2.5g of tween 20; then adding the reinforced chitosan and Tween 20 into water, and uniformly stirring at 300r/min to obtain a coating solution.
Comparative example 2:
the fertilizer effect particles are prepared by the following steps:
a1, weighing the following raw materials by weight: 1.5g of compound amino acid (compound amino acid powder), 12g of urea, 6g of phosphate fertilizer, 5g of potash fertilizer and 0.1g of trace elements; the phosphate fertilizer is calcium superphosphate and fishbone powder according to a mass ratio of 2:0.5 mixing; the potash fertilizer is composed of potassium chloride and potassium dihydrogen phosphate according to a mass ratio of 1:1.5 mixing; the trace elements are zinc sulfate heptahydrate, manganese sulfate and ammonium molybdate in a mass ratio of 1:1:1, mixing line composition;
and A2, dissolving the raw materials in water to obtain a solution with the solid mass fraction of 80%, and performing spray drum granulation to obtain fertilizer effect particles, wherein the particle size of the fertilizer effect particles is controlled to be 3mm.
Comparative example 3:
a slow release fertilizer containing compound amino acid is prepared by the following steps:
step one, weighing the following raw materials by weight: 95g of the fertilizer granules prepared in example 6, 25g of the coating solution prepared in comparative example 1;
and step two, placing the fertilizer effect particles in a spray drum granulator, coating the coating solution on the surfaces of the fertilizer effect particles in a rotating state, and drying in a drying oven at the temperature of 30 ℃ to obtain the slow release fertilizer containing the compound amino acid, wherein the particle size of the slow release fertilizer particles is controlled to be 4mm.
Comparative example 4:
a slow release fertilizer containing compound amino acid is prepared by the following steps:
step one, weighing the following raw materials by weight: 105g of fertilizer granules prepared in comparative example 2, 35g of coating solution prepared in example 4;
and step two, placing the fertilizer effect particles in a spray drum granulator, coating the coating solution on the surfaces of the fertilizer effect particles in a rotating state, and drying in a drying oven at the temperature of 30 ℃ to obtain the slow release fertilizer containing the compound amino acid, wherein the particle size of the slow release fertilizer particles is controlled to be 5mm.
Example 11: examples 8 to 10 and comparative examples 3 to 4 were subjected to the following performance tests
Slow release experiments of fertilizers: measuring by a water dissolution rate method according to the national standard (GB/T23348-2009) of the slow release fertilizer; weighing about 10g of fertilizer sample, putting the fertilizer sample into a small bag made of a 100-mesh nylon gauze, putting the small bag into a 250mL glass bottle, adding 200mL of water, covering and sealing, putting the small bag into a biochemical constant-temperature incubator at 25 ℃, sampling at 1, 7, 28, 36 and 42d respectively, testing the nitrogen release amount by adopting an automatic analyzer, and calculating the cumulative nitrogen release rate, wherein the calculation formula is as follows: v = Wn/W, where Wn is the mass fraction of nitrogen released measured on day n and W is the mass fraction of total nitrogen, and the test results are shown in table 1.
TABLE 1
Note: comparative example 3 reached 100% of nitrogen elution at day 60, and comparative example 4 reached 100% of nitrogen elution at day 64.
From the above data, it can be seen that the slow release capacities of the slow release fertilizers obtained in examples 8 to 10 are superior to the corresponding performances of the slow release fertilizers obtained in comparative examples 3 to 4.
In the description of the specification, reference to the description of "one embodiment," "an example," "a specific example" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing is illustrative and explanatory only and is not intended to be exhaustive or to limit the invention to the precise embodiments described, and various modifications, additions, and substitutions may be made by those skilled in the art without departing from the scope of the invention or exceeding the scope of the claims.
Claims (4)
1. A slow release fertilizer containing compound amino acid is characterized in that: the feed comprises the following raw materials in parts by weight: 95-115 parts of fertilizer effect particles and 25-45 parts of coating solution;
the fertilizer effect particles comprise the following raw materials in parts by weight: 1.5-4.5 parts of compound amino acid, 12-23 parts of urea, 6-16 parts of phosphate fertilizer, 5-13.5 parts of potash fertilizer and 0.1-0.5 part of trace elements;
the fertilizer effect particles are prepared by the following steps:
a1, dissolving compound amino acid in water to obtain a compound amino acid solution, and granulating to obtain compound amino acid particles;
a2, dissolving urea, phosphate fertilizer, potash fertilizer and trace elements in water to obtain mixed liquor a with the solid mass fraction of 75-85%; then placing the compound amino acid particles in a spray drum granulator, spraying the mixed solution a on the surfaces of the compound amino acid particles in a rotating state, drying and curing to obtain fertilizer effect particles;
the coating solution comprises the following components in parts by weight: 20-45 parts of reinforced chitosan, 85-100 parts of water and 2.5-4.5 parts of tween 20;
the reinforced chitosan is prepared by the following steps:
b1, adding an ethanol solution containing succinic anhydride into a chitosan solution with the mass fraction of 20-35%, stirring and reacting for 8 hours at 65 ℃, and performing post-treatment to obtain acylated chitosan; wherein the dosage ratio of the chitosan to the succinic anhydride is 100g:17-32g;
b2, preparing the acylated chitosan into a water-methanol solution with the mass fraction of 20-35%, adjusting the pH value of the solution to 5-6, then adding a mixture of EDC and NHS, stirring for 30min, adding hexylamine, stirring and reacting at 65 ℃ for 4h, and performing aftertreatment to obtain the hydrophobically modified chitosan; wherein the mass ratio of the mixture of the acylated chitosan, EDC and NHS to hexylamine is 100:11-17:20-40 parts of;
and B3, adding the hydrophobically modified chitosan and the dried rice husk carbon into a double-screw extruder, granulating and grinding to obtain the reinforced chitosan.
2. The slow release fertilizer containing compound amino acid as claimed in claim 1, wherein: in the step B3, an extrusion temperature zone is divided into four zones, wherein the temperature of the first zone is 70-75 ℃, the temperature of the second zone is 75-80 ℃, the temperature of the third zone is 80-90 ℃, the temperature of the fourth zone is 90-100 ℃, and the mass ratio of the hydrophobically modified chitosan to the rice husk carbon is 100:17-28.
3. The slow release fertilizer containing compound amino acid as claimed in claim 1, wherein: in the step A1, the mass fraction of the compound amino acid is 60-80%, and the particle size of the compound amino acid particles is 1-2mm.
4. The slow release fertilizer containing compound amino acid as claimed in claim 1, characterized in that: the grain size of the fertilizer effect grains is 2.5-3mm.
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| KR100302158B1 (en) * | 1998-08-19 | 2001-10-19 | 양지원 | Chitin/chitosan based surfactant and process for preparing the same |
| CN101857490B (en) * | 2010-05-18 | 2012-11-21 | 张超 | Slow/controlled-release compound fertilizer suitable for field crops |
| CN104693448A (en) * | 2015-03-10 | 2015-06-10 | 石河子大学 | Chitosan-based temperature-sensitive polymer, and preparation method and application thereof |
| CN109928823A (en) * | 2017-12-18 | 2019-06-25 | 郭锦 | A kind of preparation method of enveloped slow release fertilizer |
| CN109796543A (en) * | 2019-01-23 | 2019-05-24 | 青岛溯博生物技术有限公司 | A kind of preparation method of antibacterial carboxymethyl chitosan and its application in nursing ointment |
| CN109748731A (en) * | 2019-03-12 | 2019-05-14 | 史丹利化肥遂平有限公司 | A kind of high-tower granulation multielement slow-release compound fertilizer and its manufacturing method |
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