CN108238824B - Plant ash slow-release granular fertilizer and preparation method thereof - Google Patents
Plant ash slow-release granular fertilizer and preparation method thereof Download PDFInfo
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- CN108238824B CN108238824B CN201810208485.1A CN201810208485A CN108238824B CN 108238824 B CN108238824 B CN 108238824B CN 201810208485 A CN201810208485 A CN 201810208485A CN 108238824 B CN108238824 B CN 108238824B
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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
- C05G5/10—Solid or semi-solid fertilisers, e.g. powders
- C05G5/12—Granules or flakes
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05C—NITROGENOUS FERTILISERS
- C05C11/00—Other nitrogenous fertilisers
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05D—INORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C; FERTILISERS PRODUCING CARBON DIOXIDE
- C05D1/00—Fertilisers containing potassium
Abstract
The invention relates to a plant ash slow-release granular fertilizer which is prepared from plant ash, cross-linked polyaspartic acid and chain polyaspartic acid, has uniform granularity, moderate strength and high mechanical spraying efficiency, has a good slow-release function, and can finally realize the effective utilization of the plant ash as a resource; the invention also relates to a preparation method of the plant ash slow-release granular fertilizer, which is simple and convenient to operate, solves the problem of high breakage rate of fertilizer granules during drying, transportation and spraying, and has wide application prospect.
Description
Technical Field
The invention belongs to the technical field of agricultural fertilizers, and particularly relates to a plant ash fertilizer composition and a preparation method thereof.
Background
Plant ash is the residue of burned herbs and woody plants, is insoluble in water, and is rich in mineral elements, especially potassium, contained in almost all plants. The plant ash has rich raw material sources and is mainly generated after the straws are combusted in a biomass power plant. However, at present, the plant ash resources are mostly left unused in a solid waste form, and huge burden and pressure are formed on the society, the environment and enterprises. The existing treatment mode of plant ash mainly comprises solid landfill and building material additives, but the plant ash is returned to the field as an agricultural fertilizer, so that a large amount of elements consumed by plant growth in the land can be supplemented, and the sustainability of agricultural production is formed.
However, the plant ash is light and alkaline, is easy to move with wind when dry, is easy to move with water when wet, is easy to cause volatilization loss of nitrogen elements when in contact with a nitrogen fertilizer, and is not suitable for the existing agricultural mechanized production process in a powdery form. Therefore, the plant ash needs to be molded and processed to prepare the granular fertilizer. However, the plant ash particle fertilizer products on the market at present have the problems of low particle forming degree, small hardness, uneven size and the like, so that the crushing rate of the plant ash particle fertilizer products during transportation and spraying is high, and the efficiency of mechanical spraying is low.
Therefore, research and development of an effective method for preparing plant ash particles with high forming degree, high hardness, uniform particle size and high mechanical spraying efficiency are urgently needed.
Disclosure of Invention
In order to solve the technical problems, the invention provides a plant ash slow-release granular fertilizer. The plant ash slow-release granular fertilizer is prepared from plant ash, cross-linked polyaspartic acid and chain polyaspartic acid, has uniform granularity, moderate strength and high mechanical spraying efficiency, has a good slow-release function, and can finally realize the effective utilization of the plant ash as a resource. The invention also provides a preparation method of the plant ash slow-release granular fertilizer, which is simple and convenient to operate, solves the problem of high breakage rate of fertilizer granules during drying, transportation and spraying, and has wide application prospect.
Therefore, the invention provides a plant ash slow-release granular fertilizer which comprises plant ash, chain polyaspartic acid and cross-linked polyaspartic acid.
In the invention, the plant ash comprises one or more of ash of corn straws, ash of wheat straws, ash from a power plant boiler and ash from a factory boiler.
According to the invention, the plant ash slow-release granular fertilizer comprises the following components in parts by mass:
70-95 parts of plant ash;
4-15 parts of chain polyaspartic acid;
1-10 parts of cross-linked polyaspartic acid.
In some embodiments of the present invention, the molecular weight of the chain poly-aspartic acid is 5000-.
In some preferred embodiments of the present invention, the molecular weight of the chain polyaspartic acid comprises 5000-.
In other preferred embodiments of the present invention, the molecular weight of the chain-like polyaspartic acid comprises 5000-.
In some embodiments of the invention, the hardness of the particles is in the range of 12-41N, preferably 20-27N.
In some embodiments of the invention, the time for complete disintegration of the granular fertilizer is greater than or equal to 16 days, preferably 16-58 days.
The second aspect of the present invention provides a preparation method of the plant ash slow-release granular fertilizer according to the first aspect of the present invention, comprising:
step A, mixing plant ash, cross-linked polyaspartic acid and aqueous solution of chain polyaspartic acid, and uniformly stirring to obtain a mixture;
and step B, placing the mixture obtained in the step A in a hopper of a wet granulator, extruding, granulating, and drying to obtain the plant ash slow-release granular fertilizer.
According to the method of the present invention, in step A, the concentration of the aqueous solution of the chain polyaspartic acid is 10 to 50 wt%, preferably 20 to 30 wt%.
In some embodiments of the invention, the ratio of the plant ash to the chain polyaspartic acid and the cross-linked polyaspartic acid in the step A is (75-95): (4-15): (1-10), preferably (80-90): (8-13): (2-7).
The plant ash slow-release granular fertilizer provided by the invention is prepared by taking polyaspartic acid as an adhesive, and the plant ash is uniformly granulated and has certain strength by utilizing the acting forces of peptide bonds, carboxyl groups and the like in the polyaspartic acid and hydrogen bonds, van der Waals force, ionic bonds and the like of the plant ash granules; meanwhile, the chelation of carboxyl in polyaspartic acid is utilized to promote the efficient transfer of effective components required by plant production and improve the utilization rate of crops to fertilizers; by utilizing the biodegradation performance of the polyaspartic acid and the disintegration effect of the granular fertilizer caused by water absorption and expansion of the cross-linked polyaspartic acid, the plant ash granular fertilizer has a slow release function, and finally realizes the effective resource utilization of the plant ash, thereby improving the market acceptance of the plant ash granular fertilizer and being widely popularized and applied.
The preparation method of the plant ash slow-release granular fertilizer provided by the invention comprises the steps of mixing and uniformly stirring the aqueous solution of the plant ash, the cross-linked polyaspartic acid and the chain polyaspartic acid, granulating by a wet granulator and drying to obtain the granular compound fertilizer with certain strength and using the plant ash as a main agent. The method is simple and convenient to operate, improves the granulation forming rate while fully utilizing the existing equipment, has uniform product size and moderate strength, solves the problem of high breakage rate of fertilizer particles during drying, transportation and spraying, and has wide application prospect.
Detailed Description
In order that the invention may be readily understood, a detailed description of the invention is provided below. However, before the invention is described in detail, it is to be understood that this invention is not limited to particular embodiments described. It is also to be understood that the terminology used herein is for the purpose of describing particular embodiments only, and is not intended to be limiting.
Where a range of values is provided, it is understood that each intervening value, to the extent that there is no stated or intervening value in that stated range, to the extent that there is no such intervening value, is encompassed within the invention. The upper and lower limits of these smaller ranges may independently be included in the smaller ranges, and are also encompassed within the invention, subject to any specifically excluded limit in the stated range. Where a specified range includes one or both of the limits, ranges excluding either or both of those included limits are also included in the invention.
Unless otherwise defined, all terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Although any methods and materials similar or equivalent to those described herein can also be used in the practice or testing of the present invention, the preferred methods and materials are now described.
Term of
The term "chain polyaspartic acid" as used in the present invention is also referred to as polyaspartic acid, and its molecular formula is shown in (I).
The term "crosslinked polyaspartic acid" as used herein refers to a product obtained by a crosslinking reaction between molecular chains of polyaspartic acid via a crosslinking agent.
The cross-linking agent comprises an epoxy cross-linking agent, a polyamino cross-linking agent and an aldehyde cross-linking agent. The epoxy cross-linking agent is a compound with 2 or more than 2 epoxy groups. The epoxy cross-linking agent is one or more selected from ethylene glycol diglycidyl ether, polyethylene glycol diglycidyl ether, propylene glycol diglycidyl ether and polypropylene glycol diglycidyl ether. The polyamino crosslinking agent is a compound with 2 or more than 2 amino groups. The polyamino cross-linking agent is selected from one or more of hydrazine, ethylenediamine, 1, 3-propanediamine, 1, 4-butanediamine and urea. The aldehyde crosslinking agent is glutaraldehyde.
The term "water" as used herein means deionized water, ultrapure water or distilled water unless otherwise specified.
II. Detailed description of the preferred embodiments
As mentioned above, plant ash is light and alkaline, and is easy to be driven by wind when dry, and easy to be driven by water when wet, and the volatilization loss of nitrogen element is easy to be caused by the contact with nitrogen fertilizer, and the powdery form is not suitable for the existing agricultural mechanized production process. Therefore, the plant ash needs to be molded and processed to prepare the granular fertilizer. However, the plant ash particle fertilizer products on the market at present have the problems of low particle forming degree, small hardness, uneven size and the like, so that the crushing rate of the plant ash particle fertilizer products during transportation and spraying is high, and the efficiency of mechanical spraying is low. To solve these problems, the present inventors have conducted extensive studies on a vegetation ash fertilizer.
The inventor researches and discovers that the prepared plant ash granular fertilizer has the advantages of high forming degree, moderate strength, uniform granularity and high mechanical spraying efficiency, has certain slow release and water retention functions, and particularly has remarkable effect when being applied to crop planting, and the crosslinked polyaspartic acid is used as a binder and is supplemented with the chain-shaped polyaspartic acid to granulate the plant ash. The present invention has been made based on the above findings.
Therefore, the plant ash slow-release granule fertilizer according to the first aspect of the present invention comprises plant ash, chain polyaspartic acid and cross-linked polyaspartic acid.
In some embodiments of the invention, the plant ash comprises one or more of corn stover ash, wheat straw ash, power plant boiler ash, and plant boiler ash.
According to some embodiments of the invention, the plant ash slow-release granular fertilizer comprises the following components in parts by mass: 70-95 parts of plant ash, 4-15 parts of chain polyaspartic acid and 1-10 parts of cross-linked polyaspartic acid.
In some embodiments of the invention, the molecular weight of the chain polyaspartic acid is 5000-.
In some preferred embodiments of the present invention, the molecular weight of the chain polyaspartic acid includes one or more of 5000-8000Da, 40000-50000Da and 70000-80000 Da. It should be understood by those skilled in the art that the "molecular weight of the chain polyaspartic acid includes one or more of 5000-.
The inventor finds that the plant ash slow-release granular fertilizer prepared by mixing the mixture of any two or three of polyaspartic acid with the molecular weight of 5000-8000Da, 40000-50000Da and 70000-80000Da with plant ash and cross-linked polyaspartic acid has better plant or crop cultivation or planting effect.
In some preferred embodiments of the present invention, the molecular weight of the chain polyaspartic acid comprises 5000-.
In other preferred embodiments of the present invention, the molecular weight of the chain-like polyaspartic acid comprises 5000-.
The inventor researches and discovers that in the plant ash slow-release granular fertilizer, groups such as peptide bonds and carboxyl groups in polyaspartic acid and acting forces such as hydrogen bonds, van der waals forces and ionic bonds of plant ash granules enable the plant ash to be uniformly granulated and have certain strength; the chelation of carboxyl in the polyaspartic acid promotes the efficient transfer of effective components required by plant production, and improves the utilization rate of the fertilizer by crops; meanwhile, the biodegradation performance of the polyaspartic acid and the disintegration effect of the granular fertilizer caused by water absorption and expansion of the cross-linked polyaspartic acid enable the plant ash granular fertilizer to have a slow release function.
In some embodiments of the invention, the hardness of the particles is in the range of 12-41N, preferably 20-27N.
In some embodiments of the present invention, the water content of the plant ash slow-release granular fertilizer is 0.5 wt% to 15 wt%, preferably 1 wt% to 10 wt%, based on the total weight of the granular fertilizer.
In some embodiments of the invention, the time for complete disintegration of the granular fertilizer is greater than or equal to 16 days, preferably 16-58 days.
The invention relates to a preparation method of a plant ash slow-release granular fertilizer according to a first aspect of the invention, which comprises the following steps:
step A, mixing plant ash, cross-linked polyaspartic acid and aqueous solution of chain polyaspartic acid, and uniformly stirring to obtain a mixture;
and step B, placing the mixture obtained in the step A in a hopper of a wet granulator, extruding, granulating, and drying to obtain the plant ash slow-release granular fertilizer.
According to the method of the present invention, in step A, the concentration of the aqueous solution of the chain polyaspartic acid is 10 to 50 wt%, preferably 20 to 30 wt%.
In some embodiments of the invention, the ratio of the plant ash to the chain polyaspartic acid and the cross-linked polyaspartic acid in the step A is (75-95): (4-15): (1-10), preferably (80-90): (8-13): (2-7).
In the present invention, the preparation method of the cross-linked polyaspartic acid can be found in Chinese patent Nos. CN103131183A and CN102643441A (the entire contents of which are incorporated herein by reference). The molecular weight of polyaspartic acid used for preparing crosslinked polyaspartic acid in the present invention is not particularly limited as long as crosslinking can be achieved, and it is preferable to prepare crosslinked polyaspartic acid using polyaspartic acid having a molecular weight of 100000Da or more as a raw material, and specific reference is made to the above-mentioned documents.
The method of the invention mixes and stirs the water solution of the plant ash, the cross-linked polyaspartic acid and the chain polyaspartic acid uniformly according to a reasonable proportion, and then carries out granulation and drying by a wet granulator to obtain the granular compound fertilizer which has certain strength and takes the plant ash as the main agent. The method is simple and convenient to operate, improves the granulation forming rate while fully utilizing the existing equipment, has uniform product size and moderate strength, and solves the problem of high breakage rate of fertilizer particles during drying, transportation and spraying.
III, analytical methods
1. The particle strength measuring method used in the embodiment of the invention comprises the following steps:
according to the national standard GB 15063-1994, 30 grass-wood ash fertilizer particles with the diameter of 2mm-2.80mm are screened, the compression strength of the particles is measured by a particle strength tester, and the average value is taken.
2. The method for determining the disintegrating effect used in the embodiment of the invention comprises the following steps:
mixing 46-50g of plant ash slow-release granular fertilizer with 2kg of soil with the water content of 70%, uniformly stirring, placing in a thermostat at 20 ℃, and periodically checking the crushing effect of the granules. The time required by the sample without the complete granular slow release fertilizer is taken as the standard for measuring the disintegration effect of the plant ash slow release fertilizer.
IV, examples
In order that the present invention may be more readily understood, the following detailed description will proceed with reference being made to examples, which are intended to be illustrative only and are not intended to limit the scope of the invention. The starting materials or components used in the present invention may be commercially or conventionally prepared unless otherwise specified.
Example 1:
8.50kg of plant ash and 0.50g of cross-linked polyaspartic acid (taking ethylenediamine as a cross-linking agent) are mixed with 4.00kg of 25 wt% chain-shaped polyaspartic acid (the chain-shaped polyaspartic acid with the molecular weight of 5000-8000Da, 40000-50000Da and 70000-80000Da is mixed according to the mass ratio of 0.6:1: 1), the mixture is stirred uniformly and then placed into a hopper of a wet-method granulator, and after extrusion granulation molding, the mixture is dried for 4 hours under normal pressure at 100 ℃ to obtain the plant ash slow-release granular fertilizer. The experiment tests show that the particle forming effect is good; the water content is 1.25%, and the water content of the product is normal; the particle strength is 23N, and the product has good compression resistance effect; the complete disintegration time of the granular fertilizer is 32 days, and the disintegration effect and the slow release effect are good.
Example 2:
example 2 except that the cross-linked polyaspartic acid uses ethylene glycol diglycidyl ether as a cross-linking agent, the other conditions are the same as the example 1, and the plant ash slow-release granular fertilizer is obtained according to the method of the example 1. The experiment tests show that the particle forming effect is good; the water content is 1.11%, and the water content of the product is normal; the particle strength is 21N, and the product has good compression resistance effect; the complete disintegration time of the granular fertilizer is 30 days, and the disintegration effect and the slow release effect are good.
Example 3:
9.00kg of plant ash and 0.20g of cross-linked polyaspartic acid (hydrazine is taken as a cross-linking agent) are mixed with 1.60kg of chain polyaspartic acid (molecular weight is 40000-50000Da) with the concentration of 50 wt%, the mixture is uniformly stirred and then placed into a hopper of a wet granulator, and after extrusion granulation molding, the mixture is dried for 4 hours under normal pressure at 100 ℃ to obtain the plant ash slow-release granular fertilizer. Through experimental determination, the addition amount of water is small, and the particle forming effect is good; the water content is 1.33%, and the water content of the product is normal; the particle strength is 16N, and the product has better compression resistance effect. The complete disintegration time of the granular fertilizer is 44 days, and the disintegration effect and the slow release effect are better.
Example 4:
8.00kg of plant ash and 0.70g of cross-linked polyaspartic acid (polyethylene glycol diglycidyl ether is used as a cross-linking agent) are mixed with 13.00kg of 10 wt% chain polyaspartic acid (molecular weight is 40000-50000Da), the mixture is uniformly stirred and then placed into a hopper of a wet granulator, and after extrusion granulation molding, the mixture is dried for 4 hours under normal pressure at 100 ℃ to obtain the plant ash slow-release granular fertilizer. The experiment proves that the adding amount of water is larger, and the particle forming effect is good; the water content is 8.25%, and the water content of the product is higher; the particle strength is 13N, and the product has better compression resistance effect. The complete disintegration time of the granular fertilizer is 22 days, and the disintegration effect and the slow release effect are better.
Example 5:
9.00kg of plant ash and 0.50g of cross-linked polyaspartic acid (1, 3-propanediamine is taken as a cross-linking agent) are mixed with 2.50kg of 20 wt% chain polyaspartic acid (with the molecular weight of 5000-8000Da), the mixture is uniformly stirred and then placed into a hopper of a wet granulator, and after extrusion granulation molding, the mixture is dried for 4 hours under the normal pressure at the temperature of 100 ℃ to obtain the plant ash slow-release granular fertilizer. The experiment tests show that the viscosity of the material is slightly poor, and the particle forming effect is good; the water content is 1.52 percent, and the water content of the product is normal; the particle strength is 13N, and the anti-compression effect of the product is good. The complete disintegration time of the granular fertilizer is 16 days, and the disintegration effect and the slow release effect are good.
Example 6:
8.00kg of plant ash and 0.50g of cross-linked polyaspartic acid (taking propylene glycol diglycidyl ether as a cross-linking agent) are mixed with 7.50kg of chain-shaped polyaspartic acid (with the molecular weight of 70000-. Through experimental determination, the viscosity of the material is slightly overlarge, and the particle forming effect is good; the water content is 3.52 percent, and the water content of the product is normal; the granule strength is 39N, the compression resistance effect of the product is good, but the hardness is slightly too high. The complete disintegration time of the granular fertilizer is 45 days, and the disintegration effect and the slow release effect are better.
Example 7:
mixing 7.50kg of plant ash and 0.70g of cross-linked polyaspartic acid (taking ethylenediamine as a cross-linking agent) with 7.60kg of 25 wt% chain polyaspartic acid (molecular weight of 40000-50000Da), uniformly stirring, placing into a hopper of a wet granulator, extruding, granulating, molding, and drying at 100 ℃ under normal pressure for 4 hours to obtain the plant ash slow-release granular fertilizer. The experiment determines that the particle forming effect is better; the water content is 4.56%, and the water content of the product is normal; the strength of the particles is 41N, the compression resistance effect of the product is good, but the hardness is slightly too high. The complete disintegration time of the granular fertilizer is 58 days, and the disintegration effect and the slow release effect are good.
Example 8:
9.50kg of plant ash and 0.10g of cross-linked polyaspartic acid (hydrazine is taken as a cross-linking agent) are mixed with 1.60kg of 25 wt% chain polyaspartic acid (molecular weight is 40000-50000Da), the mixture is uniformly stirred and then placed into a hopper of a wet granulator, and after extrusion granulation molding, the mixture is dried for 4 hours under normal pressure at 100 ℃ to obtain the plant ash slow-release granular fertilizer. The experimental determination shows that the particle forming effect is good; the water content is 0.96%, and the water content of the product is normal; the particle strength is 12N, and the anti-compression effect of the product is good. The complete disintegration time of the granular fertilizer is 18 days, and the disintegration effect and the slow release effect are good.
Example 9:
8.50kg of plant ash and 0.10g of cross-linked polyaspartic acid (ethylene glycol diglycidyl ether is taken as a cross-linking agent) are mixed with 4.20kg of 25 wt% chain polyaspartic acid (molecular weight is 70000-80000Da), the mixture is uniformly stirred and then placed into a hopper of a wet granulator, and after extrusion granulation molding, the mixture is dried for 4 hours under the normal pressure at 100 ℃ to obtain the plant ash slow-release granular fertilizer. The experiment tests show that the particle forming effect is good; the water content is 1.96%, and the water content of the product is normal; the granule strength is 24N, and the product has good compression resistance effect. The complete disintegration time of the granular fertilizer is 58 days, and the disintegration effect and the slow release effect are good.
Example 10:
8.00kg of plant ash and 1.00g of cross-linked polyaspartic acid (polyethylene glycol diglycidyl ether is used as a cross-linking agent) are mixed with 4.00kg of 25 wt% chain polyaspartic acid (molecular weight is 40000-50000Da), the mixture is uniformly stirred and then placed into a hopper of a wet granulator, and after extrusion granulation molding, the mixture is dried for 4 hours under normal pressure at 100 ℃ to obtain the plant ash slow-release granular fertilizer. The experimental determination shows that the particle forming effect is good; the water content is 9.92%, and the water content of the product is normal; the particle strength is 25N, and the product has good compression resistance effect. The complete disintegration time of the granular fertilizer is 16 days, and the disintegration effect and the slow release effect are good.
The plant ash slow-release granular fertilizer prepared by the method in the embodiment 1 with the best effect in the embodiment is selected, and the plant ash powder fertilizer and the commercially available plant ash granular fertilizer are used as a reference, and a fertilizer effect field test is carried out according to NY/T497-2002. The adopted field test area is 23.4m2The area of the small area is measured, the corn with special number 1 of harvest is used as the crop, the inter-plant distance is 28 x 65cm, and the fertilizer application amount of the plant ash fertilizer is 100 kg/mu. As can be seen, the plant ash is used as the agricultural fertilizer, so that the yield of the corn can be really improved; meanwhile, compared with powder fertilizers, the plant ash granular fertilizer has the advantages that the fertilizer efficiency is higher and the corn yield is higher due to less wind and water erosion; compared with the commercially available plant ash granular fertilizer, the plant ash slow-release granular fertilizer has better granule forming effect and has slow-release and water retention performances, so that the yield increasing effect on corn is more obvious.
TABLE 1
The inventor conducts experimental research on the cultivation or planting of crops by using the plant ash slow-release granular fertilizer prepared from the chain polyaspartic acid with different molecular weights, and the result shows that the plant ash slow-release granular fertilizer prepared by mixing the mixture of two or three of the polyaspartic acid with the molecular weights of 5000-8000Da, 40000-50000Da and 70000-80000Da, particularly the mixture of three of the polyaspartic acid with the molecular weights of 5000-8000Da, 40000-50000Da and 70000-80000Da with the plant ash and the cross-linked polyaspartic acid has better effect on the cultivation or planting of plants or crops.
It should be noted that the above-mentioned embodiments are only for explaining the present invention, and do not constitute any limitation to the present invention. The present invention has been described with reference to exemplary embodiments, but the words which have been used herein are words of description and illustration, rather than words of limitation. The invention can be modified, as prescribed, within the scope of the claims and without departing from the scope and spirit of the invention. Although the invention has been described herein with reference to particular means, materials and embodiments, the invention is not intended to be limited to the particulars disclosed herein, but rather extends to all other methods and applications having the same functionality.
Claims (11)
1. A plant ash slow-release granular fertilizer comprises plant ash, chain polyaspartic acid and cross-linked polyaspartic acid;
the plant ash slow-release granular fertilizer comprises the following components in parts by weight:
70-95 parts of plant ash;
4-15 parts of chain polyaspartic acid;
1-10 parts of cross-linked polyaspartic acid;
the molecular weight of the chain-shaped polyaspartic acid comprises 5000-.
2. The plant ash slow-release granular fertilizer as claimed in claim 1, wherein the plant ash comprises one or more of ash of corn stalks, ash of wheat stalks, ash from power plant boilers and ash from factory boilers.
3. The plant ash slow-release granular fertilizer as claimed in claim 1, wherein the mass ratio of the chain-shaped polyaspartic acid with the molecular weight of 5000-8000Da, the chain-shaped polyaspartic acid with the molecular weight of 40000-50000Da and the chain-shaped polyaspartic acid with the molecular weight of 70000-80000Da is (0.6-1):1: 1.
4. The plant ash slow-release granular fertilizer as claimed in any one of claims 1 to 3, wherein the hardness of the granules is 12 to 41N; and/or the time for completely disintegrating the granular fertilizer is more than or equal to 16 days.
5. The plant ash slow-release granular fertilizer as claimed in claim 4, wherein the hardness of the granules is 20-27N.
6. The plant ash slow-release granular fertilizer as claimed in claim 4, wherein the time for complete disintegration of the granular fertilizer is 16-58 days.
7. A method for preparing the plant ash slow-release granular fertilizer as claimed in any one of claims 1 to 6, which comprises the following steps:
step A, mixing plant ash, cross-linked polyaspartic acid and aqueous solution of chain polyaspartic acid, and uniformly stirring to obtain a mixture;
and step B, placing the mixture obtained in the step A in a hopper of a wet granulator, extruding, granulating, and drying to obtain the plant ash slow-release granular fertilizer.
8. The production method according to claim 7, wherein in the step A, the concentration of the aqueous solution of the chain polyaspartic acid is 10 to 50 wt%.
9. The method according to claim 8, wherein the concentration of the aqueous solution of the chain polyaspartic acid in step A is 20 to 30 wt%.
10. The method for preparing the plant ash slow-release granular fertilizer as claimed in any one of claims 7 to 9, wherein in the step A, the mass ratio of the plant ash to the chain polyaspartic acid and the cross-linked polyaspartic acid is (75-95): (4-15): (1-10).
11. The method for preparing the plant ash slow-release granular fertilizer as claimed in claim 10, wherein in the step A, the mass ratio of the plant ash to the chain-like polyaspartic acid and the cross-linked polyaspartic acid is (80-90): (8-13): (2-7).
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| US6072024A (en) * | 1997-03-21 | 2000-06-06 | Mitsui Chemicals, Inc. | Production process of cross-linked polyaspartic acid resin |
| CN101962305A (en) * | 2009-07-24 | 2011-02-02 | 中国科学院兰州化学物理研究所 | Composite water-retaining agent with sustained-release potassium fertilizer |
| CN101693638B (en) * | 2009-08-28 | 2012-09-19 | 新疆满疆红农资化肥科技有限公司 | Preparation method and application method of tomato special fertilizer |
| CN103524197B (en) * | 2012-07-05 | 2015-01-07 | 北京巨泰科技有限公司 | Boron-containing synergistic urea, and preparation method and application thereof |
| CN104628476A (en) * | 2015-02-05 | 2015-05-20 | 广西中烟工业有限责任公司 | Polyaspartic acid synergistic compound fertilizer special for tobacco and preparation method thereof |
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2018
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