Anti-caking water-soluble fertilizer containing carbitol and preparation method thereof

Abstract

The invention relates to a carbitol-containing anti-caking water-soluble fertilizer and a preparation method thereof, and belongs to the field of water-soluble fertilizer production, the carbitol-containing anti-caking water-soluble fertilizer comprises the following substances by weight: 0.15-0.2% of carbitol, 20-28% of diammonium hydrogen phosphate, 22-28% of ammonium nitrate, 40-50% of potassium sulfate, 3-5% of magnesium nitrate, and 2-4% of ferric citrate. According to the invention, carbitol is applied to anti-caking of the water-soluble fertilizer for the first time, and integration of anti-caking, stability improvement and function synergism is realized; by adding carbitol, caking of the water-soluble fertilizer can be effectively avoided, a green and efficient technical scheme is provided for improving the quality of the water-soluble fertilizer, and the storage and use cost is reduced.

Description

Technical Field

[0001] This invention belongs to the field of water-soluble fertilizer production, specifically a water-soluble fertilizer containing carbitol for preventing caking and its preparation method. Background Technology

[0002] Water-soluble fertilizers, as the core carrier of efficient fertilization methods, are widely used and in high demand in modern agriculture. However, existing water-soluble fertilizers suffer from several key drawbacks: clumping during storage leads to inconvenience, and traditional anti-caking agents (such as excessive magnesium sulfate, calcium ions, and surfactants) have side effects such as poor solubility and plant burn. Research on the clumping mechanism of water-soluble fertilizers reveals the influence of van der Waals forces, hydrogen bonding, and hygroscopicity on clumping. This leads to decreased dissolution rates and even insolubility, directly affecting the speed of drone fertilization. Tiny particles can also burn leaves, reducing fertilizer utilization and increasing crop costs. Furthermore, the magnesium sulfate / calcium ions in traditional anti-caking agents easily reduce solubility, and surfactants can damage plant epidermal cells. Therefore, there is an urgent need for environmentally friendly, side-effect-free, and synergistic anti-caking technologies to drive the upgrading of water-soluble fertilizer quality. Summary of the Invention

[0003] This invention provides an anti-caking water-soluble fertilizer containing carbitol and its preparation method, in order to overcome the defects in the prior art.

[0004] This invention is achieved through the following technical solution: A water-soluble fertilizer containing carbitol for preventing caking comprises the following substances in weight percentage: carbitol 0.15-0.2%, diammonium hydrogen phosphate 20-28%, ammonium nitrate 22-28%, potassium sulfate 40-50%, magnesium nitrate 3-5%, and ferric citrate 2-4%.

[0005] The above-mentioned anti-caking water-soluble fertilizer containing carbitol has a carbitol purity of over 99%.

[0006] The anti-caking water-soluble fertilizer containing carbitol, as described above, has a diammonium hydrogen phosphate purity of 98.5% or higher.

[0007] The above-mentioned anti-caking water-soluble fertilizer containing carbitol has an ammonium nitrate purity of 99.5% or higher.

[0008] The above-mentioned anti-caking water-soluble fertilizer containing carbitol has potassium sulfate with a purity of 99.5% or higher.

[0009] The anti-caking water-soluble fertilizer containing carbitol, as described above, has a magnesium nitrate purity of over 98%.

[0010] The above-mentioned anti-caking water-soluble fertilizer containing carbitol has an iron citrate purity of over 99%.

[0011] A method for preparing an anti-caking water-soluble fertilizer containing carbitol includes the following steps: Step 1: Weigh carbitol, diammonium hydrogen phosphate, ammonium nitrate, potassium sulfate, magnesium nitrate, and ferric citrate according to the formula; Step 2: Mix carbitol, diammonium hydrogen phosphate, ammonium nitrate, potassium sulfate, magnesium nitrate and ferric citrate, then pulverize and set aside. Step 3: The pulverized carbitol, diammonium hydrogen phosphate, ammonium nitrate, potassium sulfate, magnesium nitrate and ferric citrate from Step 2 are granulated by dry granulation to prepare water-soluble fertilizer granules; Step 4: Dispense and seal to obtain the finished product.

[0012] In the preparation method of the anti-caking water-soluble fertilizer containing carbitol as described above, in step two, the material is pulverized and passed through a 100-mesh sieve for later use, and the material on the sieve is pulverized again until all of it passes through the sieve.

[0013] In the preparation method of the anti-caking water-soluble fertilizer containing carbitol as described above, the particle size of the water-soluble fertilizer particles obtained in step three is 1±0.1mm.

[0014] The advantages of this invention are: This invention is the first to apply carbitol to anti-caking of water-soluble fertilizers, achieving an integrated solution of "anti-caking - stability improvement - functional enhancement"; by adding carbitol, water-soluble fertilizer caking can be effectively avoided, providing a green and efficient technical solution for improving the quality of water-soluble fertilizers and reducing storage and usage costs. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0016] Example 1 Step 1: Weigh the following ingredients according to the specified ratio: 0.15% carbitol (99% purity), 26% diammonium hydrogen phosphate (98.5% purity), 28% ammonium nitrate (99.5% purity), 40.5% potassium sulfate (99.5% purity), 3.35% magnesium nitrate (98% purity), and 2% ferric citrate (99% purity). Step 2: Mix carbitol, calcium nitrate, diammonium hydrogen phosphate, ammonium nitrate, potassium sulfate, magnesium nitrate and ferric citrate and then crush them. After crushing, pass the crushed mixture through a 100-mesh sieve for later use. Crush the remaining material on the sieve again until all of it passes through the sieve. Step 3: The pulverized carbidol, diammonium hydrogen phosphate, ammonium nitrate, potassium sulfate, magnesium nitrate and ferric citrate from Step 2 are granulated by dry method to prepare water-soluble fertilizer granules with a particle size of 1±0.1mm. Step 4: Dispense and seal to obtain the finished product.

[0017] Example 2 Step 1: Weigh the following ingredients according to the specified ratio: 0.2% carbitol (99% purity), 21.3% diammonium hydrogen phosphate (98.5% purity), 23.5% ammonium nitrate (99.5% purity), 50% potassium sulfate (99.5% purity), 3% magnesium nitrate (98% purity), and 2% ferric citrate (99% purity). Step 2: Mix carbitol, calcium nitrate, diammonium hydrogen phosphate, ammonium nitrate, potassium sulfate, magnesium nitrate and ferric citrate and then crush them. After crushing, pass the crushed mixture through a 100-mesh sieve for later use. Crush the remaining material on the sieve again until all of it passes through the sieve. Step 3: The pulverized carbidol, diammonium hydrogen phosphate, ammonium nitrate, potassium sulfate, magnesium nitrate and ferric citrate from Step 2 are granulated by dry method to prepare water-soluble fertilizer granules with a particle size of 1±0.1mm. Step 4: Dispense and seal to obtain the finished product.

[0018] Example 3 Step 1: Weigh the following ingredients according to the specified ratio: 0.17% carbitol (99% purity), 23% diammonium hydrogen phosphate (98.5% purity), 24% ammonium nitrate (99.5% purity), 45.83% potassium sulfate (99.5% purity), 4% magnesium nitrate (98% purity), and 3% ferric citrate (99% purity). Step 2: Mix carbitol, calcium nitrate, diammonium hydrogen phosphate, ammonium nitrate, potassium sulfate, magnesium nitrate and ferric citrate and then crush them. After crushing, pass the crushed mixture through a 100-mesh sieve for later use. Crush the remaining material on the sieve again until all of it passes through the sieve. Step 3: The pulverized carbidol, diammonium hydrogen phosphate, ammonium nitrate, potassium sulfate, magnesium nitrate and ferric citrate from Step 2 are granulated by dry method to prepare water-soluble fertilizer granules with a particle size of 1±0.1mm. Step 4: Dispense and seal to obtain the finished product.

[0019] Comparative Example 1 Step 1: Weigh the following components according to the specified ratio: 0.15% magnesium sulfate (99.5% purity), 26% diammonium hydrogen phosphate (98.5% purity), 28% ammonium nitrate (99.5% purity), 40.5% potassium sulfate (99.5% purity), 3.35% magnesium nitrate (98% purity), and 2% ferric citrate (99% purity). Step 2: Mix magnesium sulfate, calcium nitrate, diammonium hydrogen phosphate, ammonium nitrate, potassium sulfate, magnesium nitrate and ferric citrate and then crush them. After crushing, pass them through a 100-mesh sieve for later use. Crush the remaining material on the sieve again until all of it passes through the sieve. Step 3: The magnesium sulfate, diammonium hydrogen phosphate, ammonium nitrate, potassium sulfate, magnesium nitrate and ferric citrate pulverized in Step 2 are granulated by dry method to prepare water-soluble fertilizer granules with a particle size of 1±0.1mm. Step 4: Dispense and seal to obtain the finished product.

[0020] Comparative Example 2 Step 1: Weigh the following components according to the specified ratio: 0.2% calcium chloride (99.5% purity), 21.3% diammonium hydrogen phosphate (98.5% purity), 23.5% ammonium nitrate (99.5% purity), 50% potassium sulfate (99.5% purity), 3% magnesium nitrate (98% purity), and 2% ferric citrate (99% purity). Step 2: Mix calcium chloride, calcium nitrate, diammonium hydrogen phosphate, ammonium nitrate, potassium sulfate, magnesium nitrate and ferric citrate and then crush them. After crushing, pass them through a 100-mesh sieve for later use. Crush the remaining material on the sieve again until all of it passes through the sieve. Step 3: The calcium chloride, diammonium hydrogen phosphate, ammonium nitrate, potassium sulfate, magnesium nitrate and ferric citrate pulverized in Step 2 are granulated by dry method to prepare water-soluble fertilizer granules with a particle size of 1±0.1mm. Step 4: Dispense and seal to obtain the finished product.

[0021] Comparative Example 3 Step 1: Weigh out the following components according to the specified ratio: sodium dodecyl sulfate (99% purity) 0.17%, diammonium hydrogen phosphate (98.5% purity) 23%, ammonium nitrate (99.5% purity) 24%, potassium sulfate (99.5% purity) 45.83%, magnesium nitrate (98% purity) 4%, and ferric citrate (99% purity) 3%. Step 2: Mix sodium dodecyl sulfonate, calcium nitrate, diammonium hydrogen phosphate, ammonium nitrate, potassium sulfate, magnesium nitrate and ferric citrate and then crush them. After crushing, pass them through a 100-mesh sieve for later use. Crush the remaining material on the sieve again until all of it passes through the sieve. Step 3: The sodium dodecyl sulfonate, diammonium hydrogen phosphate, ammonium nitrate, potassium sulfate, magnesium nitrate and ferric citrate pulverized in Step 2 are granulated by dry method to prepare water-soluble fertilizer granules with a particle size of 1±0.1mm. Step 4: Dispense and seal to obtain the finished product.

[0022] Blank example 1 Step 1: Weigh the following ingredients according to the specified ratio: 0.15% corn starch (99% purity), 26% diammonium hydrogen phosphate (98.5% purity), 28% ammonium nitrate (99.5% purity), 40.5% potassium sulfate (99.5% purity), 3.35% magnesium nitrate (98% purity), and 2% ferric citrate (99% purity). Step 2: Mix corn starch, calcium nitrate, diammonium hydrogen phosphate, ammonium nitrate, potassium sulfate, magnesium nitrate and ferric citrate and then crush them. After crushing, pass the mixture through a 100-mesh sieve for later use. Crush the remaining material on the sieve again until all of it passes through the sieve. Step 3: The corn starch, diammonium hydrogen phosphate, ammonium nitrate, potassium sulfate, magnesium nitrate and ferric citrate pulverized in Step 2 are granulated by dry method to prepare water-soluble fertilizer granules with a particle size of 1±0.1mm. Step 4: Dispense and seal to obtain the finished product.

[0023] Blank example 2 Step 1: Weigh the following ingredients according to the specified ratio: 0.2% corn starch (99% purity), 21.3% diammonium hydrogen phosphate (98.5% purity), 23.5% ammonium nitrate (99.5% purity), 50% potassium sulfate (99.5% purity), 3% magnesium nitrate (98% purity), and 2% ferric citrate (99% purity). Step 2: Mix corn starch, calcium nitrate, diammonium hydrogen phosphate, ammonium nitrate, potassium sulfate, magnesium nitrate and ferric citrate and then crush them. After crushing, pass the mixture through a 100-mesh sieve for later use. Crush the remaining material on the sieve again until all of it passes through the sieve. Step 3: The corn starch, diammonium hydrogen phosphate, ammonium nitrate, potassium sulfate, magnesium nitrate and ferric citrate pulverized in Step 2 are granulated by dry method to prepare water-soluble fertilizer granules with a particle size of 1±0.1mm. Step 4: Dispense and seal to obtain the finished product.

[0024] Blank example 3 Step 1: Weigh the following ingredients according to the specified ratio: 0.17% corn starch (99% purity), 23% diammonium hydrogen phosphate (98.5% purity), 24% ammonium nitrate (99.5% purity), 45.83% potassium sulfate (99.5% purity), 4% magnesium nitrate (98% purity), and 3% ferric citrate (99% purity). Step 2: Mix corn starch, calcium nitrate, diammonium hydrogen phosphate, ammonium nitrate, potassium sulfate, magnesium nitrate and ferric citrate and then crush them. After crushing, pass the mixture through a 100-mesh sieve for later use. Crush the remaining material on the sieve again until all of it passes through the sieve. Step 3: The corn starch, diammonium hydrogen phosphate, ammonium nitrate, potassium sulfate, magnesium nitrate and ferric citrate pulverized in Step 2 are granulated by dry method to prepare water-soluble fertilizer granules with a particle size of 1±0.1mm. Step 4: Dispense and seal to obtain the finished product.

[0025] Performance tests were conducted on Examples 1-3, Comparative Examples 1-3, and Blank Examples 1-3. Specific tests included: Anti-caking performance test: Accelerated storage test (30℃, 75% relative humidity for 30 days) was used to determine the strength of the mixed caking obtained in step two; Stability assessment: Changes in moisture content during storage were detected to observe whether deliquescence occurred; Pigment adhesion uniformity: 1% pigment was added to the water-soluble fertilizers prepared in Examples 1-3, Comparative Examples 1-3, and Blank Examples 1-3, respectively, and after thorough mixing, the uniformity of pigment distribution on the fertilizer granule surface was measured using a colorimeter; Foliar spraying performance: The contact angle (evaluating spreadability), shedding rate, and retention time of the diluted water-soluble fertilizer solution (at a mass ratio of 1:50 to water) on the leaf surface were measured; Ion absorption efficiency: The diluted water-soluble fertilizer solution (at a mass ratio of 1:50 to water) was sprayed on wheat leaves, and the residual potassium and phosphorus ions were measured after 3 days to calculate the potassium and phosphorus ion absorption and utilization rates. The test results are shown in Table 1.

[0026] Group Agglomeration strength (N / cm2) Moisture increase rate (%) Pigment distribution uniformity (%) Contact angle (°) Shedding rate (%) Duration of stay (h) Potassium ion absorption and utilization rate (%) Phosphorus ion absorption and utilization rate (%) Example 1 25.6 0.3 93.5 27.3 4.3 2.8 89.7 71.2 Example 2 24.3 0.4 91.8 26.5 3.9 2.8 90.3 70.9 Example 3 23.9 0.3 94.2 25.7 3.2 3.1 91.8 72.1 Comparative Example 1 38.7 2.7 56.4 38.4 6.7 1.8 80.4 61.3 Comparative Example 2 41.2 2.3 59.3 41.2 6.6 1.6 79.5 60.7 Comparative Example 3 34.8 2.6 71.3 37.1 5.8 1.9 79.9 62.1 Blank example 1 53.7 3.5 51.9 42.3 7.2 1.4 71.7 58.3 Blank example 2 52.6 3.7 55.3 41.7 6.9 1.6 72.3 59.2 Blank example 3 53.1 3.4 54.4 40.9 7.1 1.5 73.6 60.3 Table 1 As shown in Table 1, the agglomeration strength of the water-soluble fertilizers prepared in Examples 1-3 of this invention is significantly lower than that of the water-soluble fertilizers prepared in Comparative Examples 1-3 and Blank Examples 1-3; the moisture increase rate is also significantly lower than that of the water-soluble fertilizers prepared in Comparative Examples 1-3 and Blank Examples 1-3. Furthermore, no deliquescence was observed after the experiment, while the water-soluble fertilizers prepared in Comparative Examples 1-3 and Blank Examples 1-3 all exhibited deliquescence. In terms of looseness, the water-soluble fertilizer particles prepared in Examples 1-3 of this invention maintained a good loose state with no obvious agglomeration, while the water-soluble fertilizers prepared in Comparative Examples 1-3 and Blank Examples 1-3 all showed some agglomeration. The uniformity of pigment distribution on the surface of the fertilizer particles prepared in Examples 1-3 of this invention is significantly better than that of the water-soluble fertilizers prepared in Comparative Examples 1-3 and Blank Examples 1-3, ensuring uniform pigment distribution during actual use. Additionally, the water-soluble fertilizers prepared in Examples 1-3 of this invention... The contact angle, shedding rate, and retention time of the diluted solution are significantly better than those of the diluted solutions of water-soluble fertilizers prepared in Comparative Examples 1-3 and Blank Examples 1-3. Furthermore, the contact angle of the diluted solutions of the water-soluble fertilizers prepared in Examples 1-3 of this invention is less than 30°, the shedding rate is less than 5%, and the retention time is greater than 2.8 hours, thus demonstrating the excellent spreadability of the water-soluble fertilizer prepared in this invention. The absorption and utilization rates of potassium and phosphorus ions on wheat leaves of the diluted solutions of the water-soluble fertilizers prepared in Examples 1-3 of this invention are higher than those of the diluted solutions of the water-soluble fertilizers prepared in Comparative Examples 1-3 and Blank Examples 1-3, thereby improving the absorption and utilization rates of potassium and phosphorus ions in the diluted solutions of the water-soluble fertilizers prepared in Examples 1-3 of this invention. Therefore, the addition of carbitol to the water-soluble fertilizer prepared in this invention reduces fertilizer polarity and weakens van der Waals forces between particles, thereby reducing the probability of clumping, facilitating the storage and transportation of the water-soluble fertilizer, and relatively improving its actual performance, thus facilitating the promotion and use of water-soluble fertilizers.

[0027] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A water-soluble fertilizer containing carbitol to prevent caking, characterized in that: It includes the following substances by weight percentage: carbitol 0.15-0.2%, diammonium hydrogen phosphate 20-28%, ammonium nitrate 22-28%, potassium sulfate 40-50%, magnesium nitrate 3-5%, and ferric citrate 2-4%.

2. The anti-caking water-soluble fertilizer containing carbidol according to claim 1, characterized in that: The purity of the carbitol is above 99%.

3. The anti-caking water-soluble fertilizer containing carbidol according to claim 1, characterized in that: The purity of the diammonium hydrogen phosphate is above 98.5%.

4. The anti-caking water-soluble fertilizer containing carbidol according to claim 1, characterized in that: The purity of the ammonium nitrate is above 99.5%.

5. The anti-caking water-soluble fertilizer containing carbidol according to claim 1, characterized in that: The potassium sulfate has a purity of 99.5% or higher.

6. The anti-caking water-soluble fertilizer containing carbidol according to claim 1, characterized in that: The purity of the magnesium nitrate is above 98%.

7. The anti-caking water-soluble fertilizer containing carbidol according to claim 1, characterized in that: The purity of the ferric citrate is above 99%.

8. A method for preparing an anti-caking water-soluble fertilizer containing carbitol, characterized in that: Includes the following steps: Step 1: Weigh carbitol, diammonium hydrogen phosphate, ammonium nitrate, potassium sulfate, magnesium nitrate, and ferric citrate according to the formula; Step 2: Mix carbitol, diammonium hydrogen phosphate, ammonium nitrate, potassium sulfate, magnesium nitrate and ferric citrate, then pulverize and set aside. Step 3: The pulverized carbitol, diammonium hydrogen phosphate, ammonium nitrate, potassium sulfate, magnesium nitrate and ferric citrate from Step 2 are granulated by dry granulation to prepare water-soluble fertilizer granules; Step 4: Dispense and seal to obtain the finished product.

9. The method for preparing an anti-caking water-soluble fertilizer containing carbidol according to claim 8, characterized in that: In step two, the material that has been pulverized and passed through a 200-mesh sieve is set aside for later use. The material remaining on the sieve is then pulverized again until it has all passed through the sieve.

10. The method for preparing an anti-caking water-soluble fertilizer containing carbidol according to claim 8, characterized in that: The particle size of the water-soluble fertilizer particles obtained in step three is 1 ± 0.1 mm.