Instant fertilizer and its preparation method

Abstract

The present application relates to the technical field of fertilizer preparation, and provides a kind of instant fertilizer, including disintegrating agent and compound fertilizer, the disintegrating agent is the mixture of one or several of sodium carbonate, sodium bicarbonate, potassium carbonate, potassium bicarbonate, citric acid, polyvinylpyrrolidone K30, sodium carboxymethyl starch, low-substituted hydroxypropyl cellulose, cross-linked polyvinylpyrrolidone, cross-linked sodium carboxymethyl cellulose, sodium carboxymethyl cellulose, and the disintegrating agent is obtained by treating straw as raw material. The instant fertilizer prepared by the method of the present application can provide various nutrients required by crops, has the advantages of rapid dissolution, easy absorption, good fertilizer effect, etc.

Description

Technical Field

[0001] This invention relates to the field of fertilizer preparation technology, and in particular to a fast-dissolving fertilizer and its preparation method. Background Technology

[0002] With the promotion of integrated water and fertilizer technology, the requirements for fertilizer dissolution speed are becoming increasingly stringent. However, fast-dissolving fertilizers on the market are often expensive and have long dissolution times, severely impacting the convenience and effectiveness of fertilization. Therefore, it is essential to obtain a fertilizer that is fast-dissolving, easily absorbed, and low-cost. Summary of the Invention

[0003] The purpose of this invention is to provide a fast-dissolving fertilizer that can provide various nutrients needed by crops, and has the advantages of rapid dissolution, easy absorption, and low cost.

[0004] To achieve the above-mentioned objectives, the present invention provides the following technical solution:

[0005] This invention provides an instant fertilizer comprising the following components in weight percentage: 0.1-5% disintegrant and the remainder being compound fertilizer.

[0006] Preferably, the disintegrant includes straw fertilizer disintegrants and chemical disintegrants;

[0007] Preferably, the chemical disintegrant includes one or a mixture of several of sodium carbonate, sodium bicarbonate, potassium carbonate, potassium bicarbonate, citric acid, polyvinylpyrrolidone K30, sodium carboxymethyl starch, low-substituted hydroxypropyl cellulose, croscarmellose, croscarmellose sodium carboxymethyl cellulose, and sodium carboxymethyl cellulose.

[0008] Preferably, the straw fertilizer disintegrant is obtained by processing straw as raw material.

[0009] Preferably, the mass content of sodium carboxymethyl cellulose and sodium carboxymethyl hemicellulose in the straw fertilizer disintegrant is 80-90%; the mass ratio of sodium carboxymethyl cellulose to sodium carboxymethyl hemicellulose is (6-9):(1-4).

[0010] Preferably, the compound fertilizer is one or more of nitrogen fertilizer, phosphorus fertilizer, and potassium fertilizer.

[0011] The present invention also provides a method for preparing the quick-dissolving fertilizer, comprising the following steps: mixing compound fertilizer and disintegrant in a certain proportion, granulating and drying to obtain the quick-dissolving fertilizer.

[0012] Preferably, the mixing process is accompanied by stirring, the stirring speed is 50-120 r / min, and the stirring time is 3-8 min.

[0013] Preferably, the granulation particle size is 1-5 mm.

[0014] Preferably, the drying temperature is 20-180℃ and the drying time is 20-100 min.

[0015] By adopting the above technical solution, the present invention has the following beneficial effects:

[0016] The quick-dissolving fertilizer of this invention comprises a disintegrant and a compound fertilizer. The straw fertilizer disintegrant contains the active ingredients sodium carboxymethyl cellulose and sodium carboxymethyl hemicellulose, obtained by processing straw as raw material; the raw material is widely available and inexpensive. This invention can also calculate the specific types and proportions of nitrogen, phosphorus, and potassium fertilizers applied according to the target plant and soil, thereby obtaining a more suitable quick-dissolving fertilizer that better provides crops with the various nutrients they need. Simultaneously, the fertilizer has advantages such as rapid dissolution, easy absorption, and good fertilizer efficiency. Detailed Implementation

[0017] The present invention provides an instant fertilizer comprising the following components in weight percentage: 0.1-5% disintegrant and the remainder being compound fertilizer, more preferably comprising 0.5-4.5% disintegrant and the remainder being compound fertilizer, and even more preferably comprising 1-3% disintegrant and the remainder being compound fertilizer.

[0018] In this invention, the disintegrant includes straw fertilizer disintegrants and chemical disintegrants. The chemical disintegrant in this invention includes one or a mixture of several of the following: sodium carbonate, sodium bicarbonate, potassium carbonate, potassium bicarbonate, citric acid, polyvinylpyrrolidone K30, sodium carboxymethyl starch, low-substituted hydroxypropyl cellulose, croscarmellose, croscarmellose sodium carboxymethyl cellulose, and sodium carboxymethyl cellulose. When the disintegrant is a straw fertilizer disintegrant and polyvinylpyrrolidone K30, the mass ratio of the straw fertilizer disintegrant to polyvinylpyrrolidone K30 is preferably 1:(0.01-10), more preferably 1:(0.08-5), and even more preferably 1:0.1. When the disintegrant is a straw fertilizer disintegrant and low-substituted hydroxypropyl cellulose, the mass ratio of the straw fertilizer disintegrant to low-substituted hydroxypropyl cellulose is preferably 1:(0.01-8), more preferably 1:(0.08-4.5), and even more preferably 1:0.1. When the disintegrant is a straw fertilizer disintegrant and sodium carboxymethyl cellulose, the mass ratio of the straw fertilizer disintegrant to sodium carboxymethyl cellulose is preferably 1:(0.005-5), more preferably 1:(0.065-2), and even more preferably 1:0.1. When the disintegrant is a straw fertilizer disintegrant and cross-linked polyvinylpyrrolidone, the mass ratio of the straw fertilizer disintegrant to cross-linked polyvinylpyrrolidone is preferably 1:(0.03-1), more preferably 1:(0.08-0.5), and even more preferably 1:0.1.

[0019] In this invention, the straw fertilizer disintegrant is obtained by processing straw as raw material. The processing procedure is as follows: the straw is crushed, then subjected to SO3 micro-thermal explosion, enzymatic degradation, H2O2, and dilute alkaline solution treatment, followed by filtration. The filter residue is collected to obtain holocellulose, which is then etherified to obtain the final product. The SO3 micro-thermal explosion treatment in this invention is carried out using a batch reactor. The preferred temperature for the SO3 micro-thermal explosion treatment is 60-80℃, more preferably 63-75℃, and even more preferably 65℃. The SO3 micro-thermal explosion treatment is accompanied by the continuous introduction of SO3 gas for 0.5-2 hours, more preferably 0.8-1.5 hours, and even more preferably 1 hour. The enzyme used in the enzymatic degradation process in this invention is preferably at least one of laccase, xylanase, and catalase. The enzyme is applied in the form of an enzyme solution, the concentration of which is preferably 3-10 wt%, more preferably 4-8 wt%, and even more preferably 5 wt%. The amount of enzyme solution added is preferably 5-30 times the mass of the straw, more preferably 8-20 times, and even more preferably 10 times. The enzyme degradation temperature is preferably 30-60℃, more preferably 40-55℃, and even more preferably 50℃. The enzyme degradation time is preferably 20-120 min, more preferably 70-110 min, and even more preferably 100 min. In this invention, during the H2O2 treatment process, the mass solubility of H2O2 is preferably 1-10%, more preferably 4-9%, and even more preferably 8%; the amount of H2O2 added is preferably 5-30 times the mass of straw, more preferably 8-25 times, and even more preferably 10 times; the reaction temperature is preferably 30-70℃, more preferably 40-60℃, and even more preferably 50℃; the reaction time is preferably 20-120 min, more preferably 80-110 min, and even more preferably 100 min. After H2O2 treatment, the mixture is filtered, and the filter residue is collected for further treatment with a dilute alkali solution. The dilute alkali solution in this invention is at least one of NaOH, KOH, and ammonia water. The preferred mass concentration of the dilute alkali solution is 0.5-15%, more preferably 1.5-8%, and even more preferably 3%. The preferred amount of dilute alkali solution added is 5-30 times the mass of the straw, more preferably 6-15 times, and even more preferably 10 times. The preferred reaction time is 1-12 hours, more preferably 2-10 hours, and even more preferably 4 hours. In this invention, after the dilute alkali solution treatment, the mixture is filtered again, and the collected filter residue is holocellulose. The holocellulose is then etherified, preferably by first mixing the holocellulose with ethanol. The preferred mass ratio of the holocellulose to ethanol is 1:(1-3), more preferably 1:(1.4-2.5), and even more preferably 1:(1.8-2.1).Then, the pH value is adjusted. In this invention, an alkaline solution is preferably used for adjustment. The adjusted pH value is preferably 9-12, more preferably 10-11.3, and even more preferably 11. Next, an epoxy compound is added. The epoxy compound is preferably at least one of epichlorohydrin, epichlorohydrin, and ethylene oxide. The mass ratio of the epoxy compound to holocellulose is preferably (0.1-0.5):10, more preferably (0.25-0.48):10, and even more preferably (0.4-0.45):10. Finally, a chlorocarboxylic acid is added. The chlorocarboxylic acid in this invention includes chloroacetic acid. The preferred mass ratio of the chlorocarboxylic acid to holocellulose is (1-2):10, more preferably (1.3-1.9):10, and even more preferably (1.7-1.8):10; the preferred reaction temperature is 50-80℃, more preferably 55-70℃, and even more preferably 65℃; the preferred reaction time is 180-360 min, more preferably 200-300 min, and even more preferably 210 min.

[0020] In this invention, the straw fertilizer disintegrant contains sodium carboxymethyl cellulose and sodium carboxymethyl hemicellulose. The mass content of sodium carboxymethyl cellulose and sodium carboxymethyl hemicellulose is preferably 80-90%, more preferably 83-89%, and even more preferably 88%. The mass ratio of sodium carboxymethyl cellulose to sodium carboxymethyl hemicellulose is preferably (6-9):(1-4), more preferably (6.5-8):(2-3.5), and even more preferably 7:3.

[0021] In this invention, the compound fertilizer is one or more of nitrogen fertilizer, phosphate fertilizer, and potassium fertilizer, wherein the nitrogen fertilizer includes one or more of urea, monoammonium phosphate, and ammonium nitrate phosphate; the phosphate fertilizer includes one or more of ammonium nitrate phosphate, ammonium phosphate, and magnesium phosphate; and the potassium fertilizer includes potassium sulfate and / or potassium chloride. In this invention, when the compound fertilizer is nitrogen fertilizer, phosphate fertilizer, and potassium fertilizer, the preferred mass percentage is 22-45% nitrogen fertilizer, 25-55% phosphate fertilizer, and 20-40% potassium fertilizer.

[0022] The present invention also provides a method for preparing the quick-dissolving fertilizer, comprising the following steps: mixing compound fertilizer and disintegrant in a certain proportion, granulating and drying to obtain the quick-dissolving fertilizer.

[0023] In this invention, compound fertilizer and disintegrant are mixed in the specified proportion, and the mixing process is accompanied by stirring. The stirring speed is preferably 50-120 r / min, more preferably 55-90 r / min, and even more preferably 60 r / min. The stirring time is preferably 3-8 min, more preferably 4-7 min, and even more preferably 5 min.

[0024] In this invention, after uniform mixing and stirring, granulation is performed. The preferred granulation methods include two-roll extrusion granulation, wet disc granulation, and melt crystallization granulation. When the granulation method is wet disc granulation, the solvent used is any one of ethanol, methanol, and water. When the granulation method is melt crystallization granulation, the granulation temperature is preferably 90-200℃, more preferably 110-180℃, and even more preferably 130℃. In this invention, the granules are preferably spherical, oblate, strip-shaped, or flake-shaped; the particle size is preferably 1-5 mm, more preferably 2-4 mm, and even more preferably 3 mm. After granulation, the present invention performs a drying process, wherein the drying method includes any one of vacuum drying, forced air drying, and spray drying; the drying temperature is preferably 20-180℃, more preferably 50-150℃, and even more preferably 80℃; the drying time is preferably 20-100min, more preferably 35-80min, and even more preferably 50min.

[0025] The technical solutions provided by the present invention will be described in detail below with reference to the embodiments, but they should not be construed as limiting the scope of protection of the present invention.

[0026] Example 1

[0027] A fast-dissolving fertilizer, comprising 3% by mass of a disintegrant and 97% by mass of a compound fertilizer;

[0028] The disintegrant is prepared by mixing straw fertilizer disintegrant and polyvinylpyrrolidone K30 in a mass ratio of 1:0.1; the compound fertilizer is composed of 15% monoammonium phosphate, 30% potassium sulfate, 45% ammonium nitrate phosphate, and 10% urea.

[0029] The straw fertilizer disintegrant contains 88% sodium carboxymethyl cellulose and sodium carboxymethyl hemicellulose by mass, with a mass ratio of 7:3. The straw fertilizer disintegrant is made by crushing straw to a length less than 5mm and placing it in a reactor. SO3 gas is continuously introduced at 65℃ for SO3 micro-thermal explosion treatment for 1 hour. Then, it is mixed with 5wt% enzyme solution (10 times the weight of the straw) and subjected to enzymatic degradation reaction at 50℃ for 100 minutes. The enzyme used is laccase and [unclear - possibly a specific enzyme composition] in a 1:1 mass ratio. Catalase was added, and then 8% H2O2 (10 times the weight of straw) was added and treated at 50℃ for 100 min. After filtration, the collected filter residue was treated with 3% NaOH solution (10 times the weight of straw) for 4 h to obtain holocellulose. Holocellulose was mixed with industrial ethanol at a mass ratio of 1:1.8, and the pH was adjusted to 11 with NaOH solution. Then, propylene oxide was added at a mass ratio of 0.4:10 to holocellulose, and then chloroacetic acid at a mass ratio of 1.7:10 to holocellulose was added. The mixture was reacted at 65℃ for 210 min to obtain the final product.

[0030] The preparation method of the above-mentioned quick-dissolving fertilizer includes the following steps:

[0031] The compound fertilizer and disintegrant are mixed in the above proportion and stirred at 60 r / min for 5 min. Then, the mixture is granulated by double roller extrusion. The granules are flat and round with a particle size of 3 mm. The mixture is then dried at 80°C for 50 min to obtain the quick-dissolving fertilizer.

[0032] Example 2

[0033] A fast-dissolving fertilizer, comprising 3% by mass of a disintegrant and 97% by mass of a compound fertilizer;

[0034] The disintegrant is prepared by mixing straw fertilizer disintegrant and low-substituted hydroxypropyl cellulose in a mass ratio of 1:0.1; the compound fertilizer is composed of 15% monoammonium phosphate, 30% potassium sulfate, 45% ammonium nitrate phosphate, and 10% urea.

[0035] The straw fertilizer disintegrant contains 88% sodium carboxymethyl cellulose and sodium carboxymethyl hemicellulose by mass, with a mass ratio of 6:4. The straw fertilizer disintegrant is made from straw, which is crushed to a length of less than 5mm and placed in a reactor. It undergoes a micro-thermal explosion treatment with SO3 gas continuously introduced at 65℃ for 1 hour. Then, it is mixed with 5wt% enzyme solution (10 times the weight of the straw) and subjected to enzymatic degradation at 50℃ for 100 minutes. The enzyme used is laccase and [unclear - likely a specific enzyme composition] in a 1:1 mass ratio. Catalase was added, and then 8% H2O2 (10 times the weight of straw) was added and treated at 50℃ for 100 min. After filtration, the collected filter residue was treated with 3% NaOH solution (10 times the weight of straw) for 4 h to obtain holocellulose. Holocellulose was mixed with industrial ethanol at a mass ratio of 1:1.8, and the pH was adjusted to 11 with NaOH solution. Then, propylene oxide was added at a mass ratio of 0.4:10 to holocellulose, and then chloroacetic acid at a mass ratio of 1.7:10 to holocellulose was added. The mixture was reacted at 65℃ for 210 min to obtain the final product.

[0036] The preparation method of the above-mentioned quick-dissolving fertilizer includes the following steps:

[0037] The compound fertilizer and disintegrant are mixed in the above proportion and stirred at 60 r / min for 5 min. Then, the mixture is granulated by double roller extrusion. The granules are flat and round with a particle size of 3 mm. The mixture is then dried at 80°C for 50 min to obtain the quick-dissolving fertilizer.

[0038] Example 3

[0039] A fast-dissolving fertilizer, comprising 3% by mass of a disintegrant and 97% by mass of a compound fertilizer;

[0040] The disintegrant is prepared by mixing straw fertilizer disintegrant and sodium carboxymethyl cellulose in a mass ratio of 1:0.1; the compound fertilizer is composed of 15% monoammonium phosphate, 30% potassium sulfate, 45% ammonium nitrate phosphate, and 10% urea.

[0041] The straw fertilizer disintegrant contains 88% sodium carboxymethyl cellulose and sodium carboxymethyl hemicellulose by mass, with a mass ratio of 8:2. The straw fertilizer disintegrant is made by crushing straw to a length less than 5mm and placing it in a reactor. SO3 gas is continuously introduced at 65℃ for 1 hour for SO3 micro-thermal explosion treatment. Then, it is mixed with 5wt% enzyme solution (10 times the weight of the straw) and subjected to enzymatic degradation reaction at 50℃ for 100 minutes. The enzyme used is laccase and [unclear - possibly a specific enzyme composition] in a 1:1 mass ratio. Catalase was added, and then 8% H2O2 (10 times the weight of straw) was added and treated at 50℃ for 100 min. After filtration, the collected filter residue was treated with 3% NaOH solution (10 times the weight of straw) for 4 h to obtain holocellulose. Holocellulose was mixed with industrial ethanol at a mass ratio of 1:1.8, and the pH was adjusted to 11 with NaOH solution. Then, propylene oxide was added at a mass ratio of 0.4:10 to holocellulose, and then chloroacetic acid at a mass ratio of 1.7:10 to holocellulose was added. The mixture was reacted at 65℃ for 210 min to obtain the final product.

[0042] The preparation method of the above-mentioned quick-dissolving fertilizer includes the following steps:

[0043] The compound fertilizer and disintegrant are mixed in the above proportion and stirred at 60 r / min for 5 min. Then, the mixture is granulated by double roller extrusion. The granules are flat and round with a particle size of 3 mm. The mixture is then dried at 80°C for 50 min to obtain the quick-dissolving fertilizer.

[0044] Example 4

[0045] A fast-dissolving fertilizer, comprising 1% by mass of a disintegrant and 99% by mass of a compound fertilizer;

[0046] The disintegrant is prepared by mixing straw fertilizer disintegrant and polyvinylpyrrolidone K30 at a mass ratio of 1:0.1; the compound fertilizer is composed of 15% monoammonium phosphate, 30% potassium chloride, 45% ammonium phosphate, and 10% urea.

[0047] The straw fertilizer disintegrant contains 80% sodium carboxymethyl cellulose and sodium carboxymethyl hemicellulose by mass, with a mass ratio of 7:3. The straw fertilizer disintegrant is made by crushing straw to a length less than 5mm and placing it in a reactor. SO3 gas is continuously introduced at 60℃ for 0.5 hours for SO3 micro-thermal explosion treatment. Then, it is mixed with 3wt% enzyme solution (5 times the weight of the straw) and subjected to enzymatic degradation reaction at 40℃ for 100 minutes. The enzyme used is xylan with a mass ratio of 1:0.8. Enzymes and catalase were added, and then 4% H2O2 (5 times the weight of straw) was added and treated at 40℃ for 120 min. After filtration, the collected filter residue was treated with 1.5% NaOH solution (6 times the weight of straw) for 1 h to obtain holocellulose. Holocellulose was mixed with industrial ethanol at a mass ratio of 1:2.1, and the pH was adjusted to 11 with NaOH solution. Then, ethylene oxide was added at a mass ratio of 0.45:10 to holocellulose, and then chloroacetic acid at a mass ratio of 1.8:10 to holocellulose was added. The mixture was reacted at 50℃ for 180 min to obtain the final product.

[0048] The preparation method of the above-mentioned quick-dissolving fertilizer includes the following steps:

[0049] The compound fertilizer and disintegrant are mixed in the above proportion and stirred at 50 r / min for 8 min. Then, the mixture is granulated by double roller extrusion. The granules are flat and round with a particle size of 3 mm. The mixture is then dried at 50°C for 100 min to obtain the quick-dissolving fertilizer.

[0050] Example 5

[0051] A fast-dissolving fertilizer, comprising 0.5% by mass of a disintegrant and 99.5% by mass of a compound fertilizer;

[0052] The disintegrant is prepared by mixing straw fertilizer disintegrant and polyvinylpyrrolidone K30 at a mass ratio of 1:0.08; the compound fertilizer is composed of 12% monoammonium phosphate, 40% potassium sulfate, 30% magnesium phosphate, and 18% urea.

[0053] The straw fertilizer disintegrant contains 90% sodium carboxymethyl cellulose and sodium carboxymethyl hemicellulose by mass, with a mass ratio of 7:3. The straw fertilizer disintegrant is made by crushing straw to a length of less than 5 mm and placing it in a reactor. SO3 gas is continuously introduced at 60°C for 0.5 hours for SO3 micro-thermal explosion treatment. Then, it is mixed with 3wt% enzyme solution (5 times the weight of the straw) and subjected to enzymatic degradation reaction at 40°C for 100 minutes. The enzyme used is a 1:0.8 mass ratio of xylene to cellulose. Glycosylase and catalase were added, and then 25 times the weight of straw in 9% H2O2 was added and treated at 60℃ for 80 min. After filtration, the collected filter residue was treated with 15 times the weight of straw in 8% NaOH solution for 10 h to obtain holocellulose. Holocellulose was mixed with industrial ethanol at a mass ratio of 1:2.1, and the pH value was adjusted to 11 with NaOH solution. Then, propylene oxide was added at a mass ratio of 0.45:10 to holocellulose, and then chloroacetic acid at a mass ratio of 1:10 to holocellulose was added. The mixture was reacted at 80℃ for 300 min to obtain the final product.

[0054] The preparation method of the above-mentioned quick-dissolving fertilizer includes the following steps:

[0055] The compound fertilizer and disintegrant are mixed in the above proportion and stirred at 90 r / min for 3 min. Then, the mixture is granulated by double roller extrusion. The granules are flat and round with a particle size of 3 mm. The mixture is then dried at 150°C for 20 min to obtain the quick-dissolving fertilizer.

[0056] Experimental Example 1 (one)

[0058] Based on Example 1, different disintegrants were obtained by adjusting only the type and amount of disintegrant. 100 kg of compound fertilizer was mixed with different disintegrants to prepare quick-dissolving fertilizers. 100 g of quick-dissolving fertilizers prepared from different groups were placed in 1000 mL of water for dissolution experiments to investigate the solubility of the quick-dissolving fertilizers in different groups.

[0059] Table 1. Setting of different groups of disintegrants

[0060]

[0061]

[0062] Note: Different lowercase letters in Table 1 represent different types of disintegrants, and different uppercase letters represent different amounts added. "Lowercase letter-uppercase letter" represents the amount added for the corresponding type of disintegrant.

[0063] Table 2. Dissolution time (min) for different groups

[0064]

[0065] As can be seen from Table 2, the quick-dissolving fertilizer prepared using the disintegrant described in this invention has a better dissolving effect. (two)

[0067] Based on Example 1, instant fertilizers with particle sizes of 2mm, 3mm, and 5mm were prepared. The solubility of the three particle sizes of the instant fertilizer prepared in Example 1 was compared with that of three commercially available instant fertilizers (Goldenton, Red Bull, and Difumei brands, purchased from JD.com). 100g of the instant fertilizer prepared in Example 1 and 100g of the commercially available instant fertilizer were respectively placed in 1000ml of water for dissolution experiments.

[0068] Table 3. Dissolution time (min) of different fast-dissolving fertilizers

[0069]

[0070]

[0071] As shown in Table 3, the solubility of the quick-dissolving fertilizers of different particle sizes prepared by this invention is superior to that of commercially available quick-dissolving fertilizers. That is, the quick-dissolving fertilizers described in this invention have better solubility.

[0072] As can be seen from the above embodiments, the quick-dissolving fertilizer made from the raw materials described in this invention has the advantages of rapid dissolution, easy absorption, and good fertilizer effect. Among them, the raw materials for the straw fertilizer disintegrant are widely available and have low cost.

[0073] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A fast-dissolving fertilizer, characterized in that, It includes the following components by weight percentage: 0.1-5% disintegrant and the remainder being compound fertilizer; The disintegrants include straw fertilizer disintegrants and chemical disintegrants; The chemical disintegrant includes one or a mixture of several of the following: sodium carbonate, sodium bicarbonate, potassium carbonate, potassium bicarbonate, citric acid, polyvinylpyrrolidone K30, sodium carboxymethyl starch, low-substituted hydroxypropyl cellulose, crospyvinylpyrrolidone, crospycarboxymethyl cellulose sodium, and sodium carboxymethyl cellulose. The straw fertilizer disintegrant is obtained by processing straw as raw material. The processing procedure is as follows: after crushing the straw, it is subjected to SO3 micro-heat explosion, enzyme degradation, H2O2, and dilute alkaline solution treatment, then filtered, the filter residue is collected to obtain holocellulose, and then etherified to obtain the product. The mass content of sodium carboxymethyl cellulose and sodium carboxymethyl hemicellulose in the straw fertilizer disintegrant is 80-90%; the mass ratio of sodium carboxymethyl cellulose to sodium carboxymethyl hemicellulose is (6-9):(1-4).

2. The quick-dissolving fertilizer according to claim 1, characterized in that, The compound fertilizer is one or more of nitrogen fertilizer, phosphorus fertilizer, and potassium fertilizer.

3. A method for preparing the quick-dissolving fertilizer according to claim 1 or 2, characterized in that, Includes the following steps: After mixing the compound fertilizer and disintegrant in a certain proportion, the mixture is granulated and dried to obtain the quick-dissolving fertilizer.

4. The preparation method according to claim 3, characterized in that, The mixing process is accompanied by stirring, the stirring speed is 50-120 r / min, and the stirring time is 3-8 min.

5. The preparation method according to claim 3, characterized in that, The granulation particle size is 1-5 mm.

6. The preparation method according to claim 3, characterized in that, The drying temperature is 20-180℃, and the drying time is 20-100 min.

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