Effervescent water-soluble fertilizer and preparation method thereof

Abstract

The invention relates to an effervescent water-soluble fertilizer and a preparation method thereof, the effervescent water-soluble fertilizer comprises a solid acidic material, a solid alkaline bubble material, a water-soluble fertilizer raw material and a diaphragm material, and the effervescent water-soluble fertilizer is characterized in that the diaphragm material is divided into two parts, one part is used for internal addition, and the other part is used for external addition. The effervescent water-soluble fertilizer is high in dissolving speed, and the problems of pulverization and caking in the storage process of the effervescent water-soluble fertilizer can be effectively solved.

Description

Technical Field

[0001] The invention relates to an effervescent water-soluble fertilizer and a preparation method thereof. Background Art

[0002] Water-soluble fertilizers are suitable for modern agriculture and can effectively save water, fertilizer and manpower. Water-soluble fertilizers can be divided into two types according to their form: solid and liquid. Liquid fertilizers are relatively easy to use and can be mixed by gently stirring them in water. However, liquid water-soluble fertilizers have the problems of low content and high transportation costs. When solid water-soluble fertilizers are used, they will sink to the bottom of the water because they are solid and have a greater specific gravity than water, thereby reducing the contact area between water and water-soluble fertilizers. There is a problem of long dissolution time, which brings inconvenience to use. The advantages are high content and low transportation costs.

[0003] In order to solve the problem of slow dissolution of solid water-soluble fertilizers, most of the existing solid water-soluble fertilizers are in powder form. Since powder has a larger specific surface area than granules, it is easier to agglomerate. If it is not produced and stored properly, it will form large lumps, which brings inconvenience to use. Another method is to prepare solid water-soluble fertilizers into effervescent granules to accelerate the dissolution rate of the water-soluble fertilizer. However, due to the influence of water-soluble fertilizer raw materials and their preparation process, the existing effervescent water-soluble fertilizers have serious problems of powderization and agglomeration. Therefore, they are not common in the market, and effervescence changes the properties of the water-soluble fertilizer, which sometimes affects the use of the water-soluble fertilizer.

[0004] Currently, there is no product or method to solve the problem of effervescence affecting the use of water-soluble fertilizers, nor is there any solution to the serious powdering and clumping of effervescent water-soluble fertilizers. Summary of the invention

[0005] The invention provides an effervescent water-soluble fertilizer and a preparation method thereof, and solves the technical problems that 1) the existing solid water-soluble fertilizer has a slow dissolution speed and is inconvenient to use; 2) effervescence affects the use of the water-soluble fertilizer; and 3) the effervescent water-soluble fertilizer is seriously powdered and lumped.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] An effervescent water-soluble fertilizer comprises a solid acidic material, a solid alkaline bubble material, a water-soluble fertilizer raw material and a diaphragm material, wherein the mass ratio of the solid acidic material, the solid alkaline bubble material, the water-soluble fertilizer raw material and the diaphragm material is 8-26:10-32:37-80:2-5, and the mass ratio of the solid acidic material to the solid alkaline bubble material is 0.4-0.8:1.0-1.2, and the pH is 3.0-6.0; the pH is a solution for detecting the effervescent water-soluble fertilizer and water in a mass ratio of 1:250.

[0008] The solid acid material is one or more of citric acid, monosodium citrate, oxalic acid and tartaric acid; the solid alkaline bubble material is one or more of sodium carbonate, sodium bicarbonate, ammonium bicarbonate, potassium carbonate and potassium bicarbonate; the water-soluble fertilizer raw material is one or more of urea, ammonium sulfate, potassium sulfate, potassium polyphosphate, diammonium phosphate and potassium dihydrogen phosphate; the diaphragm material is one or both of polyethylene glycol and polyvinyl pyrrolidone.

[0009] The diaphragm material is divided into two parts, one for internal addition and the other for external addition;

[0010] The diaphragm material is used to isolate the solid acidic material from the solid alkaline bubble material.

[0011] The membrane material is divided into two parts, and the mass ratio of the part for internal addition to the part for external addition is 1.2-4.2:0.8-2.4.

[0012] The preparation method of effervescent water-soluble fertilizer is carried out according to the following steps:

[0013] Preparing a membrane material solution: adding an externally added membrane material into ethanol to prepare a membrane material solution with a concentration of 5 to 12%;

[0014] Preparation of acid particles: adding a membrane material solution to a solid acid material, mixing, drying, and obtaining particles with a particle size of less than 0.8 mm, namely, acid particles; or, mixing a solid acid material and urea, adding a membrane material solution, mixing, drying, and obtaining particles with a particle size of less than 0.8 mm, namely, acid particles;

[0015] Preparation of alkaline particles: adding a membrane material solution to a solid alkaline bubble material, mixing, and drying to obtain particles with a particle size of less than 0.8 mm, namely, alkaline particles; or, mixing a solid alkaline bubble material and urea, adding a membrane material solution, mixing, and drying to obtain particles with a particle size of less than 0.8 mm, namely, alkaline particles;

[0016] Preparation of effervescent water-soluble fertilizer: mix acid particles, alkali particles, water-soluble fertilizer raw materials except urea and internal added diaphragm materials, add diaphragm material solution and mix, and obtain effervescent water-soluble fertilizer through extrusion and drying.

[0017] The mass ratio of the solid acid material to the membrane material solution is 1:0.06-0.12; the mass ratio of the total mass of the solid acid material and urea to the membrane material solution is 1:0.06-0.12;

[0018] The mass ratio of the solid alkaline bubble material to the membrane material solution is 1:0.08-0.15; the mass ratio of the total mass of the solid alkaline bubble material and urea to the membrane material solution is 1:0.08-0.15;

[0019] The mass ratio of the total mass of the acid particles, the alkali particles, the water-soluble fertilizer raw materials except urea and the internally added diaphragm material to the diaphragm material solution is 1:0.01-0.05.

[0020] The ethanol is an ethanol solution with an ethanol mass fraction greater than 95%.

[0021] The membrane material solution is added by spraying.

[0022] The water content of the effervescent water-soluble fertilizer is less than 1%.

[0023] The invention has the following beneficial technical effects:

[0024] 1) The mass ratio of solid acidic material and solid alkaline bubble material controlled by the present application is 0.5-0.8:1.0-1.2, that is, the mass of acidic material is less than the mass of solid alkaline bubble material, and the pH of effervescent water-soluble fertilizer is 3.0-6.0, which is conducive to preventing the effervescent water-soluble fertilizer from pulverizing and agglomerating, and can react quickly during use, preventing carbonate and bicarbonate from reacting with calcium and magnesium ions in water, or the ionized hydroxide of bicarbonate from reacting with dihydrogen phosphate, so that dihydrogen phosphate becomes phosphate, and phosphate reacts with calcium and magnesium ions, thereby affecting the use of water-soluble fertilizer; at the same time, a pH higher than 6.0 will affect the dissolution rate of effervescent water-soluble fertilizer in water, and a pH lower than 3.0 will not meet the pH limit of water-soluble fertilizer set by the Ministry of Agriculture and Rural Affairs, and long-term use will acidify the soil and cause damage to plant roots.

[0025] 2) The present application divides the diaphragm material into two parts, wherein the inner added part acts as a lubricant to improve the fluidity of each substance and the roundness of the particles, and the outer added part acts as a binder to improve the hardness of the particles. The combination of the inner and outer additions can prevent the effervescent water-soluble fertilizer from pulverizing and agglomerating.

[0026] 3) The present application prepares acid granules by mixing solid acidic material and urea, adding diaphragm material solution, or mixes solid alkaline bubble material and urea, adding diaphragm material solution, preparing alkaline granules, and further preparing effervescent fertilizer, which can prevent the effervescent water-soluble fertilizer from pulverizing and agglomerating. DETAILED DESCRIPTION

[0027] In order to better understand the above technical solution, the technical solution of the present invention is described in detail below in conjunction with preferred examples.

[0028] Example 1

[0029] An effervescent water-soluble fertilizer is composed of citric acid, potassium bicarbonate, potassium dihydrogen phosphate, urea and polyethylene glycol-6000 in a mass ratio of 12:28:32:25:3, wherein the polyethylene glycol is divided into two parts, one for internal addition and the other for external addition; the mass ratio of internal addition to external addition is 2.64:0.36, the pH value is 5.0, and disodium citrate is used to adjust the pH value.

[0030] The preparation method of effervescent water-soluble fertilizer is carried out according to the following steps:

[0031] Prepare a membrane material solution: add polyethylene glycol-6000 to ethanol to prepare a polyethylene glycol-6000 ethanol solution with a concentration of 5%;

[0032] Preparation of acid particles: Add polyethylene glycol-6000 ethanol solution to citric acid, mix well, and dry to obtain particles with a particle size of less than 0.8 mm, namely acid particles;

[0033] Preparation of alkali particles: potassium bicarbonate and urea are mixed, polyethylene glycol-6000 ethanol solution is added, mixed, and dried to obtain microparticles with a particle size of less than 0.8 mm, namely alkali particles;

[0034] Preparation of effervescent water-soluble fertilizer: mix the acid particles, alkali particles, potassium dihydrogen phosphate and polyethylene glycol-6000, add polyethylene glycol-6000 ethanol solution and mix, and obtain the effervescent water-soluble fertilizer by extrusion and drying.

[0035] The mass ratio of citric acid to polyethylene glycol-6000 ethanol solution is 1:0.08.

[0036] The mass ratio of the total mass of potassium bicarbonate and urea to the polyethylene glycol-6000 ethanol solution is 1:0.08.

[0037] The mass ratio of the total mass of the acid particles, the alkali particles, potassium dihydrogen phosphate and the added polyethylene glycol-6000 to the polyethylene glycol-6000 ethanol solution is 1:0.02.

[0038] The ethanol is industrial ethanol with an ethanol mass fraction of 95%.

[0039] The polyethylene glycol-6000 ethanol solution is added by spraying.

[0040] The water content of the effervescent water-soluble fertilizer is 0.8%.

[0041] Example 2

[0042] An effervescent water-soluble fertilizer is composed of citric acid, potassium bicarbonate, potassium dihydrogen phosphate, urea and polyethylene glycol-6000 in a mass ratio of 12:28:32:25:3, wherein the polyethylene glycol is divided into two parts, one for internal addition and the other for external addition; the mass ratio of internal addition to external addition is 2.64:0.36, the pH value is 5.0, and disodium citrate is used to adjust the pH value.

[0043] The preparation method of effervescent water-soluble fertilizer is carried out according to the following steps:

[0044] Prepare a membrane material solution: add polyethylene glycol-6000 to ethanol to prepare a polyethylene glycol-6000 ethanol solution with a concentration of 5%;

[0045] Preparation of acid particles: citric acid and urea are mixed, polyethylene glycol-6000 ethanol solution is added, mixed, dried, and particles with a particle size of less than 0.8 mm are obtained, namely, acid particles;

[0046] Preparation of alkali particles: adding polyethylene glycol-6000 ethanol solution to potassium bicarbonate, mixing, and drying to obtain microparticles with a particle size of less than 0.8 mm, namely alkali particles;

[0047] Preparation of effervescent water-soluble fertilizer: mix the acid particles, alkali particles, potassium dihydrogen phosphate and polyethylene glycol-6000, add polyethylene glycol-6000 ethanol solution and mix, and obtain the effervescent water-soluble fertilizer by extrusion and drying.

[0048] The mass ratio of the total mass of citric acid and urea to the polyethylene glycol-6000 ethanol solution is 1:0.08.

[0049] The mass ratio of potassium bicarbonate to polyethylene glycol-6000 ethanol solution is 1:0.08.

[0050] The mass ratio of the total mass of the acid particles, the alkali particles, potassium dihydrogen phosphate and the added polyethylene glycol-6000 to the polyethylene glycol-6000 ethanol solution is 1:0.02.

[0051] The ethanol is industrial ethanol with an ethanol mass fraction of 95%.

[0052] The polyethylene glycol-6000 ethanol solution is added by spraying.

[0053] The water content of the effervescent water-soluble fertilizer is 0.8%.

[0054] Example 3

[0055] An effervescent water-soluble fertilizer is composed of citric acid, potassium bicarbonate, potassium dihydrogen phosphate, ammonium sulfate and polyethylene glycol-6000 in a mass ratio of 12:28:32:25:3, wherein the polyethylene glycol is divided into two parts, one for internal addition and the other for external addition; the mass ratio of internal addition to external addition is 2.64:0.36, the pH value is 5.0, and disodium citrate is used to adjust the pH value.

[0056] The preparation method of effervescent water-soluble fertilizer is carried out according to the following steps:

[0057] Prepare a membrane material solution: add polyethylene glycol-6000 to ethanol to prepare a polyethylene glycol-6000 ethanol solution with a concentration of 5%;

[0058] Preparation of acid particles: Add polyethylene glycol-6000 ethanol solution to citric acid, mix well, and dry to obtain particles with a particle size of less than 0.8 mm, namely acid particles;

[0059] Preparation of alkali particles: adding polyethylene glycol-6000 ethanol solution to potassium bicarbonate, mixing, and drying to obtain microparticles with a particle size of less than 0.8 mm, namely alkali particles;

[0060] Preparation of effervescent water-soluble fertilizer: mix the acid particles, alkali particles, potassium dihydrogen phosphate, ammonium sulfate and polyethylene glycol-6000, add polyethylene glycol-6000 ethanol solution and mix, and obtain the effervescent water-soluble fertilizer by extrusion and drying.

[0061] The mass ratio of citric acid to polyethylene glycol-6000 ethanol solution is 1:0.08.

[0062] The mass ratio of potassium bicarbonate to polyethylene glycol-6000 ethanol solution is 1:0.08.

[0063] The mass ratio of the total mass of the acid particles, the alkali particles, potassium dihydrogen phosphate and the added polyethylene glycol-6000 to the polyethylene glycol-6000 ethanol solution is 1:0.02.

[0064] The ethanol is industrial ethanol with an ethanol mass fraction of 95%.

[0065] The polyethylene glycol-6000 ethanol solution is added by spraying.

[0066] The water content of the effervescent water-soluble fertilizer is 0.8%.

[0067] Example 4

[0068] An effervescent water-soluble fertilizer is composed of tartaric acid, potassium carbonate, potassium dihydrogen phosphate, ammonium sulfate, urea, polyethylene glycol-6000 and polyvinyl pyrrolidone K30 in a mass ratio of 14:20:28:12:22:3.35:0.65, wherein the polyethylene glycol is used for internal addition and the polyvinyl pyrrolidone K30 is used for external addition, the pH value is 4.8, and disodium citrate is used to adjust the pH value.

[0069] The preparation method of effervescent water-soluble fertilizer is carried out according to the following steps:

[0070] Prepare a membrane material solution: add the external additive polyvinyl pyrrolidone K30 into ethanol to prepare a polyvinyl pyrrolidone K30 ethanol solution with a concentration of 10%;

[0071] Preparation of acid particles: Add polyvinyl pyrrolidone K30 ethanol solution to tartaric acid and urea, mix well, and dry to obtain particles with a particle size of less than 0.8 mm, namely acid particles;

[0072] Preparation of alkali particles: adding polyvinyl pyrrolidone K30 ethanol solution to potassium carbonate, mixing, drying, and obtaining microparticles with a particle size of less than 0.8 mm, namely alkali particles;

[0073] Preparation of effervescent water-soluble fertilizer: mix the acid particles, alkali particles, potassium dihydrogen phosphate, ammonium sulfate and polyethylene glycol-6000, add polyvinyl pyrrolidone K30 ethanol solution and mix well, and obtain the effervescent water-soluble fertilizer by extrusion and drying.

[0074] The mass ratio of the total mass of tartaric acid and urea to the mass ratio of the polyvinylpyrrolidone K30 ethanol solution is 1:0.8.

[0075] The mass ratio of potassium bicarbonate to polyvinylpyrrolidone K30 ethanol solution is 1:0.8.

[0076] The mass ratio of the total mass of the acid particles, the alkali particles, potassium dihydrogen phosphate and the internally added polyethylene glycol-6000 to the polyvinyl pyrrolidone K30 ethanol solution is 1:0.02.

[0077] The ethanol is industrial ethanol with an ethanol mass fraction of 95%.

[0078] The polyvinyl pyrrolidone K30 ethanol solution is added by spraying.

[0079] The water content of the effervescent water-soluble fertilizer is 0.8%.

[0080] Example 5

[0081] An effervescent water-soluble fertilizer is composed of oxalic acid, potassium carbonate, ammonium dihydrogen phosphate, potassium dihydrogen phosphate, urea, polyethylene glycol-8000 and polyvinyl pyrrolidone K30 in a mass ratio of 15:32:15:20:15:2.31:0.69, wherein polyethylene glycol is used for internal addition and polyvinyl pyrrolidone K30 is used for external addition, the pH value is 4.8, and disodium citrate is used to adjust the pH value.

[0082] The preparation method of effervescent water-soluble fertilizer is carried out according to the following steps:

[0083] Prepare a membrane material solution: add the external additive polyvinyl pyrrolidone K30 into ethanol to prepare a polyvinyl pyrrolidone K30 ethanol solution with a concentration of 10%;

[0084] Preparation of acid particles: Add polyvinyl pyrrolidone K30 ethanol solution to oxalic acid and urea, mix well, and dry to obtain particles with a particle size of less than 0.8 mm, namely acid particles;

[0085] Preparation of alkali particles: adding polyvinyl pyrrolidone K30 ethanol solution to potassium carbonate, mixing, drying, and obtaining microparticles with a particle size of less than 0.8 mm, namely alkali particles;

[0086] Preparation of effervescent water-soluble fertilizer: mix the acid particles, alkali particles, potassium dihydrogen phosphate, ammonium sulfate and polyethylene glycol-8000, add polyvinyl pyrrolidone K30 ethanol solution and mix well, and obtain the effervescent water-soluble fertilizer by extrusion and drying.

[0087] The mass ratio of the total mass of oxalic acid and urea to the mass ratio of the polyvinylpyrrolidone K30 ethanol solution is 1:0.8.

[0088] The mass ratio of potassium bicarbonate to polyvinylpyrrolidone K30 ethanol solution is 1:0.8.

[0089] The mass ratio of the total mass of the acid particles, the alkali particles, potassium dihydrogen phosphate and the internally added polyethylene glycol-6000 to the polyvinyl pyrrolidone K30 ethanol solution is 1:0.02.

[0090] The ethanol is industrial ethanol with an ethanol mass fraction of 95%.

[0091] The polyvinyl pyrrolidone K30 ethanol solution is added by spraying.

[0092] The water content of the effervescent water-soluble fertilizer is 0.6%.

[0093] The beneficial effects of the present invention are further illustrated below in conjunction with test data:

[0094] Test materials

[0095] Test 1

[0096] 1.1 Test location: Laboratory of Ban Lao Shi Special Fertilizer Research and Design Institute (Henan) Co., Ltd., laboratory temperature 25℃, humidity 62%.

[0097] 1.2 Experimental test: Count the powdering rate and agglomeration rate, and observe the phenomenon of dissolution in water;

[0098] 1.3 Test method: The effervescent water-soluble fertilizer (particle size between 2mm-4mm) produced in the experiment is packaged in water-soluble fertilizer packaging bags, 5kg / bag, and stacked 30 bags high in parallel for 2 months. Take the bag at the bottom, and one person holds the water-soluble fertilizer bag with both hands to the chest level, and then lets go, and the fertilizer bag falls freely, once in the front and once in the back, and pours out the water-soluble fertilizer. It is sieved with 2mm and 4mm sieves, and the mass of the water-soluble fertilizer is recorded as m0, the mass greater than 4mm is recorded as m1, and the mass less than 2mm is recorded as m2. The powdering rate (%) = m2 / m0*100%; the caking rate (%) = m1 / m0*100%.

[0099] The experimental setting treatment is as follows: comparison 1 (except that the pH is adjusted to 7.5 by using trisodium citrate, the others are consistent with Example 1), comparison 2 (except that all polyethylene glycol-6000 is used as internal addition and the external ethanol solution is replaced by ethanol, the others are consistent with Example 1), comparison 3 (except that the internal polyethylene glycol-6000 is not added, the others are consistent with Example 1), comparison 4 (except that urea is not added in the preparation of the alkali particles, but urea is added when preparing the effervescent water-soluble fertilizer, that is, the preparation method of the effervescent water-soluble fertilizer is to mix the acid particles, the alkali particles, the urea, the potassium dihydrogen phosphate and the internal polyethylene glycol-6000, add the polyethylene glycol-6000 ethanol solution to mix, and obtain the effervescent water-soluble fertilizer by extruding and drying, and the others are consistent with Example 1), the effervescent water-soluble fertilizer prepared in Example 1, Example 2, Example 3, Example 4 and Example 5

[0100] Except for the different processing, the other implementations of this application are consistent.

[0101] 2 Results and analysis

[0102] The results of the powdering rate, agglomeration rate and the phenomenon of dissolution in water, among which the differentiation rate and agglomeration rate are taken as the average value, are shown in Table 1

[0103] Table 1

[0104] Powdering rate (%) Agglomeration rate (%) Phenomenon, Comparison 1 1.87 2.03 Bubbles are generated during the dissolution process, the dissolution speed is fast, and flocculation occurs Comparison 2 10.21 8.37 Bubbles are generated during the dissolution process, the dissolution speed is fast, and no flocculation is generated Contrast 3 8.51 6.24 Bubbles are generated during the dissolution process, the dissolution speed is fast, and no flocculation is generated Contrast 4 18.35 14.59 Bubbles are generated during the dissolution process, the dissolution speed is fast, and no flocculation is generated Example 1 1.74 1.85 Bubbles are generated during the dissolution process, the dissolution speed is fast, and no flocculation is generated Example 2 1.52 1.63 Bubbles are generated during the dissolution process, the dissolution speed is fast, and no flocculation is generated Example 3 1.64 1.75 Bubbles are generated during the dissolution process, the dissolution speed is fast, and no flocculation is generated Example 4 1.49 1.68 Bubbles are generated during the dissolution process, the dissolution speed is fast, and no flocculation is generated Example 5 1.75 1.99 Bubbles are generated during the dissolution process, the dissolution speed is fast, and no flocculation is generated

[0105] It can be seen from the data in Table 1 that although the powdering rate and agglomeration rate of Comparison 1 are not high, flocculation occurs during the dissolution process. Water-soluble fertilizers are used for drip irrigation or sprinkler irrigation, especially for drip irrigation. The drip irrigation eye is relatively small, and the flocculation may clog the drip irrigation eye, thus affecting the use of the product.

[0106] From the data comparison of Comparison 2, Comparison 3 and Example 1, it can be seen that the powdering rate and agglomeration rate of Comparison 2 using only internal addition or Comparison 3 using only external addition are higher than those of Example 1 using a combination of internal and external additions, that is, the combination of internal and external additions can effectively prevent the powdering and agglomeration of the effervescent water-soluble.

[0107] From the data comparison of Comparison 4, Example 1, Example 2 and Example 3, it can be seen that urea directly affects the pulverization and agglomeration of the effervescent water-soluble fertilizer. After wrapping urea with one or both of an acidic material or a solid alkaline bubble material, the effervescent water-soluble fertilizer can be prepared, which can significantly reduce the pulverization rate and agglomeration rate of the effervescent water-soluble fertilizer; Example 3 in which urea is replaced with ammonium sulfate can also significantly reduce the pulverization rate and agglomeration rate of the effervescent water-soluble fertilizer.

Claims

1. An effervescent water-soluble fertilizer, comprising a solid acidic material, a solid alkaline bubble material, a water-soluble fertilizer raw material and a diaphragm material, characterized in that: The mass ratio of solid acidic material, solid alkaline bubble material, water-soluble fertilizer raw material and diaphragm material is 8-26:10-32:37-80:2-5, and the mass ratio of solid acidic material and solid alkaline bubble material is 0.4-0.8:1.0-1.2, and the pH is 3.0-6.0; the pH is to detect the aqueous solution of effervescent water-soluble fertilizer and water in a mass ratio of 1:

250.

2. the effervescent water-soluble fertilizer as claimed in claim 1, is characterized in that, The solid acid material is one or more of citric acid, monosodium citrate, oxalic acid and tartaric acid; the solid alkaline bubble material is one or more of sodium carbonate, sodium bicarbonate, ammonium bicarbonate, potassium carbonate and potassium bicarbonate; the water-soluble fertilizer raw material is one or more of urea, ammonium sulfate, potassium sulfate, potassium polyphosphate, diammonium phosphate and potassium dihydrogen phosphate; the diaphragm material is one or both of polyethylene glycol and polyvinyl pyrrolidone.

3. the effervescent water-soluble fertilizer as claimed in claim 1 or 2, is characterized in that, The diaphragm material is divided into two parts, one for internal addition and the other for external addition; The diaphragm material is used to isolate the solid acidic material from the solid alkaline bubble material.

4. The effervescent water-soluble fertilizer according to claim 3, wherein The membrane material is divided into two parts, and the mass ratio of the part for internal addition to the part for external addition is 1.2-4.2:0.8-2.

4.

5. The preparation method of the effervescent water-soluble fertilizer according to any one of claims 1 to 4, characterized in that, Follow the steps below, Preparing a membrane material solution: adding an externally added membrane material into ethanol to prepare a membrane material solution with a concentration of 5 to 12%; Preparation of acid particles: adding a membrane material solution to a solid acid material, mixing, drying, and obtaining particles with a particle size of less than 0.8 mm, namely, acid particles; or, mixing a solid acid material and urea, adding a membrane material solution, mixing, drying, and obtaining particles with a particle size of less than 0.8 mm, namely, acid particles; Preparation of alkaline particles: adding a membrane material solution to a solid alkaline bubble material, mixing, and drying to obtain particles with a particle size of less than 0.8 mm, namely, alkaline particles; or, mixing a solid alkaline bubble material and urea, adding a membrane material solution, mixing, and drying to obtain particles with a particle size of less than 0.8 mm, namely, alkaline particles; Preparation of effervescent water-soluble fertilizer: mix acid particles, alkali particles, water-soluble fertilizer raw materials except urea and internal added diaphragm materials, add diaphragm material solution and mix, and obtain effervescent water-soluble fertilizer through extrusion and drying.

6. The preparation method of effervescent water-soluble fertilizer as claimed in claim 5, characterized in that, The mass ratio of the solid acid material to the membrane material solution is 1:0.06-0.12; the mass ratio of the total mass of the solid acid material and urea to the membrane material solution is 1:0.06-0.12; The mass ratio of the solid alkaline bubble material to the membrane material solution is 1:0.08-0.15; the mass ratio of the total mass of the solid alkaline bubble material and urea to the membrane material solution is 1:0.08-0.15; The mass ratio of the total mass of the acid particles, the alkali particles, the water-soluble fertilizer raw materials except urea and the internally added diaphragm material to the diaphragm material solution is 1:0.01-0.

05.

7. The preparation method of effervescent water-soluble fertilizer as claimed in claim 5, characterized in that, The ethanol is an ethanol solution with an ethanol mass fraction greater than 95%.

8. The preparation method of effervescent water-soluble fertilizer as claimed in claim 5, characterized in that, The membrane material solution is added by spraying.

9. The preparation method of effervescent water-soluble fertilizer as claimed in claim 5, characterized in that, The water content of the effervescent water-soluble fertilizer is less than 1%.