Water-soluble fertilizer anti-caking agent and preparation method thereof

Abstract

The application relates to the technical field of water-soluble fertilizer, and discloses a water-soluble fertilizer anti-caking agent and a preparation method thereof, which is prepared from the following raw materials in a mass percentage: 10-50% of dipropylene glycol ether, 5-50% of dipropylene glycol ether, 2-10% of ethylene glycol mono-tert-butyl ether, 5-15% of a surfactant and 10-40% of diethylene glycol ether. Through the technical scheme, the problem of poor anti-caking rate and serious caking in the production of water-soluble fertilizer in the prior art is solved.

Description

Technical Field

[0001] This invention relates to the field of water-soluble fertilizer technology, specifically to a water-soluble fertilizer anti-caking agent and its preparation method. Background Technology

[0002] Water-soluble fertilizers are simple to produce and use, with flexible formulations, comprehensive nutrients, rapid effects, and high nutrient utilization. Therefore, they are widely used in irrigation and fertilization of vegetables, flowers, fruit trees, and field crops in greenhouses. Although my country's water-soluble fertilizer industry has developed rapidly, certain problems remain in production technology, market regulation, supporting facilities, and application research. For example, solid water-soluble fertilizers often exhibit severe hygroscopic clumping during production. The main causes of clumping include high hygroscopicity, high water or crystal water content, and large compressive weight. Currently, measures to prevent clumping in solid macro-element water-soluble fertilizers include production and packaging in low-humidity environments, producing larger spherical granules, and adding anti-caking agents. However, all three measures have poor anti-caking rates, resulting in severe clumping. Therefore, developing a high-anti-caking agent for water-soluble fertilizers is crucial for their production. Summary of the Invention

[0003] This invention proposes a water-soluble fertilizer anti-caking agent and its preparation method, which solves the problems of poor anti-caking rate and severe caking in the production of water-soluble fertilizers in related technologies.

[0004] The technical solution of the present invention is as follows:

[0005] This invention proposes a water-soluble fertilizer anti-caking agent, which is composed of the following raw materials in the following mass percentages: 10%~50% dipropylene glycol ether, 5%~50% dipropylene glycol ether, 2%~10% ethylene glycol monotert-butyl ether, 5%~15% surfactant, and 10%~40% diethylene glycol ether.

[0006] As a further technical solution, the surfactant is one or more of isomeric decayl alcohol polyoxyethylene ether, isomeric undecyl alcohol polyoxyethylene ether, and isomeric tridecayl alcohol polyoxyethylene ether.

[0007] As a further technical solution, the surfactant is isomeric tridecyl alcohol polyoxyethylene ether.

[0008] As a further technical solution, the EO number of the isomeric tridecyl alcohol polyoxyethylene ether is 5 to 10.

[0009] As a further technical solution, the preparation method of the water-soluble fertilizer anti-caking agent includes the following steps:

[0010] S1. Mix dipropylene glycol ether, dipropylene glycol ether, and diethylene glycol ether, and stir to obtain mixture A;

[0011] S2. Heat mixture A to 40~50℃, add surfactant dropwise, and keep warm to obtain mixture B;

[0012] S3. Add ethylene glycol monotert-butyl ether to mixture B, keep warm at 40~50℃, and cool to room temperature to obtain water-soluble fertilizer anti-caking agent.

[0013] As a further technical solution, the heat preservation time in step S2 is 0.5~1.5h.

[0014] As a further technical solution, the heat preservation time in step S3 is 0.5~3h.

[0015] As a further technical solution, the heat preservation time in step S3 is 1~3h.

[0016] As a further technical solution, the amount of the water-soluble fertilizer anti-caking agent added is 0.1% to 0.5% of the mass of the water-soluble fertilizer.

[0017] As a further technical solution, the amount of the water-soluble fertilizer anti-caking agent added is 0.1% to 0.3% of the mass of the water-soluble fertilizer.

[0018] The working principle and beneficial effects of this invention are as follows:

[0019] 1. In this invention, dipropylene glycol ether, dipropylene glycol ether, ethylene glycol monotert-butyl ether, surfactant, and diethylene glycol ether are used as the main components of the water-soluble fertilizer anti-caking agent, which increases the gap between water-soluble fertilizer particles, prevents the formation of salt bridges, and effectively reduces the bulk density and agglomeration ratio of water-soluble fertilizer.

[0020] 2. In this invention, isomeric tridecyl alcohol polyoxyethylene ether is used as a surfactant in the anti-caking agent of water-soluble fertilizer, which further reduces the bulk density and agglomeration ratio of water-soluble fertilizer. Attached Figure Description

[0021] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0022] Figure 1 The height of the finished 24-8-24 water-soluble fertilizer produced in the workshop before and after adding the water-soluble fertilizer caking agent of Example 10 is shown in the figure. The left side of the figure is the finished product without the anti-caking agent, and the right side is the finished product with the anti-caking agent added.

[0023] Figure 2 The height of the finished 13-5-40 water-soluble fertilizer before and after adding the anti-caking agent from Example 11 is shown in the figure. The left side of the figure is the finished product with the anti-caking agent added, and the right side is the finished product without the anti-caking agent added. Detailed Implementation

[0024] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0025] Example 1

[0026] A water-soluble fertilizer anti-caking agent comprises the following raw materials in weight percentage: 40% dipropylene glycol ether, 40% dipropylene glycol ether, 5% ethylene glycol monotert-butyl ether, 5% isomeric tridecyl alcohol polyoxyethylene ether (EO number of 5), and 10% diethylene glycol ether.

[0027] A method for preparing a water-soluble fertilizer anti-caking agent includes the following steps:

[0028] S1. Mix 40g of dipropylene glycol ether, 40g of dipropylene glycol ether, and 10g of diethylene glycol ether, and stir to obtain mixture A.

[0029] S2. Heat mixture A in a water bath to 40°C, slowly add 5.0 g of isotridecyl alcohol polyoxyethylene ether, and keep warm for 1.5 h to obtain mixture B;

[0030] S3. Slowly add 5.0g of ethylene glycol monotert-butyl ether to mixture B, keep warm for 3 hours, stir continuously and cool naturally to room temperature to obtain the water-soluble fertilizer anti-caking agent product.

[0031] Application of water-soluble fertilizer anti-caking agents in potassium dihydrogen phosphate and ammonium sulfate water-soluble fertilizers:

[0032] The bulk density of potassium dihydrogen phosphate and ammonium sulfate water-soluble fertilizer products before and after the addition of water-soluble fertilizer anti-caking agent was tested according to GB / T 23771-2009 standard:

[0033] Take 2000g of potassium dihydrogen phosphate and divide it into two portions using a sample divider. The bulk density of one portion was measured to be 1.13g / mL. Add 2.0g of the above-mentioned water-soluble fertilizer anti-caking agent to the other portion, mix well, and the bulk density was measured to be 1.08g / mL, which represents a decrease of 4.42%.

[0034] Take 2000g of ammonium sulfate and divide it into two portions using a sample divider. The bulk density of one portion was measured to be 1.02g / mL. The other portion was mixed with 2.5g of the water-soluble fertilizer anti-caking agent mentioned above. The bulk density was measured to be 0.88g / mL, which is a decrease of 13.73%.

[0035] Example 2

[0036] A water-soluble fertilizer anti-caking agent comprises the following raw materials by weight percentage: 30% dipropylene glycol ether, 30% dipropylene glycol ether, 8% ethylene glycol monotert-butyl ether, 12% isomeric tridecyl alcohol polyoxyethylene ether (EO number of 7), and 20% diethylene glycol ether.

[0037] A method for preparing a water-soluble fertilizer anti-caking agent includes the following steps:

[0038] S1. Mix 30g of dipropylene glycol ether, 30g of dipropylene glycol ether, and 20g of diethylene glycol ether, and stir to obtain mixture A.

[0039] S2. Heat mixture A in a water bath to 45°C, slowly add 12g of isotridecyl alcohol polyoxyethylene ether, keep warm for 1 hour, and obtain mixture B.

[0040] S3. Slowly add 8g of ethylene glycol monotert-butyl ether to mixture B, keep warm for 2 hours, stir continuously and cool naturally to room temperature to obtain the water-soluble fertilizer anti-caking agent product.

[0041] Application of water-soluble fertilizer anti-caking agents in potassium dihydrogen phosphate and ammonium sulfate water-soluble fertilizers:

[0042] The bulk density of potassium dihydrogen phosphate and ammonium sulfate water-soluble fertilizer products before and after the addition of water-soluble fertilizer anti-caking agent was tested according to GB / T 23771-2009 standard:

[0043] Take 2000g of potassium dihydrogen phosphate and divide it into two portions using a sample divider. The bulk density of one portion was measured to be 1.13g / mL. The other portion was mixed with 1.5g of the water-soluble fertilizer anti-caking agent mentioned above. The bulk density was measured to be 1.09g / mL, which is a decrease of 3.54%.

[0044] Take 2000g of ammonium sulfate and divide it into two portions using a sample divider. The bulk density of one portion was measured to be 1.02g / mL. The other portion was mixed with 2.0g of the water-soluble fertilizer anti-caking agent mentioned above. The bulk density was measured to be 0.91g / mL, which represents a decrease of 10.78%.

[0045] Example 3

[0046] A water-soluble fertilizer anti-caking agent comprises the following raw materials in weight percentage: 35% dipropylene glycol ether, 25% dipropylene glycol ether, 4% ethylene glycol monotert-butyl ether, 15% isomeric tridecyl alcohol polyoxyethylene ether (EO number of 10), and 21% diethylene glycol ether.

[0047] A method for preparing a water-soluble fertilizer anti-caking agent includes the following steps:

[0048] S1. Mix 35g of dipropylene glycol ether, 25g of dipropylene glycol ether, and 21g of diethylene glycol ether, and stir to obtain mixture A.

[0049] S2. Heat mixture A in a water bath to 50°C, slowly add 15g of isotridecyl alcohol polyoxyethylene ether, and keep warm for 0.5h to obtain mixture B;

[0050] S3. Slowly add 4g of ethylene glycol monotert-butyl ether to mixture B, keep warm for 1 hour, stir continuously and cool naturally to room temperature to obtain the water-soluble fertilizer anti-caking agent product.

[0051] Application of water-soluble fertilizer anti-caking agents in potassium dihydrogen phosphate and ammonium sulfate water-soluble fertilizers:

[0052] The bulk density of potassium dihydrogen phosphate and ammonium sulfate water-soluble fertilizer products before and after the addition of water-soluble fertilizer anti-caking agent was tested according to GB / T 23771-2009 standard:

[0053] Take 2000g of potassium dihydrogen phosphate and divide it into two portions using a sample divider. The bulk density of one portion was measured to be 1.13g / mL. The other portion was mixed with 2.5g of the water-soluble fertilizer anti-caking agent mentioned above. The bulk density was measured to be 1.08g / mL, which is a decrease of 4.42%.

[0054] Take 2000g of ammonium sulfate and divide it into two portions using a sample divider. The bulk density of one portion was measured to be 1.02g / mL. The other portion was mixed with 1.0g of the water-soluble fertilizer anti-caking agent mentioned above. The bulk density was measured to be 0.96g / mL, which is a decrease of 5.88%.

[0055] Example 4

[0056] A water-soluble fertilizer anti-caking agent comprises the following raw materials by weight percentage: 30% dipropylene glycol ether, 30% dipropylene glycol ether, 8% ethylene glycol monotert-butyl ether, 12% isomeric tridecyl alcohol polyoxyethylene ether (EO number of 5), and 20% diethylene glycol ether.

[0057] A method for preparing a water-soluble fertilizer anti-caking agent includes the following steps:

[0058] S1. Mix 30g of dipropylene glycol ether, 30g of dipropylene glycol ether, and 20g of diethylene glycol ether, and stir to obtain mixture A.

[0059] S2. Heat mixture A in a water bath to 45°C, slowly add 12g of isotridecyl alcohol polyoxyethylene ether, keep warm for 1 hour, and obtain mixture B.

[0060] S3. Slowly add 8g of ethylene glycol monotert-butyl ether to mixture B, keep warm for 2 hours, stir continuously and cool naturally to room temperature to obtain the water-soluble fertilizer anti-caking agent product.

[0061] Application of water-soluble fertilizer anti-caking agents in potassium chloride and monoammonium phosphate water-soluble fertilizers:

[0062] The bulk density of potassium chloride and monoammonium phosphate products before and after the addition of water-soluble fertilizer anti-caking agent was tested according to GB / T 23771-2009 standard:

[0063] Take 2000g of potassium chloride and divide it into two portions using a sample divider. The bulk density of one portion was measured to be 1.09g / mL. The other portion was mixed with 3.0g of the water-soluble fertilizer anti-caking agent mentioned above. The bulk density was measured to be 0.93g / mL, which is a decrease of 14.68%.

[0064] Take 2000g of monoammonium phosphate and divide it into two portions using a sample divider. The bulk density of one portion was measured to be 0.89g / mL. The other portion was mixed with 1.5g of the water-soluble fertilizer anti-caking agent mentioned above. The bulk density was measured to be 0.83g / mL, which is a decrease of 6.74%.

[0065] Example 5

[0066] A water-soluble fertilizer anti-caking agent comprises the following raw materials by weight percentage: 30% dipropylene glycol ether, 30% dipropylene glycol ether, 8% ethylene glycol monotert-butyl ether, 12% isomeric tridecyl alcohol polyoxyethylene ether (EO number of 5), and 20% diethylene glycol ether.

[0067] A method for preparing a water-soluble fertilizer anti-caking agent includes the following steps:

[0068] S1. Mix 30g of dipropylene glycol ether, 30g of dipropylene glycol ether, and 20g of diethylene glycol ether, and stir to obtain mixture A.

[0069] S2. Heat mixture A in a water bath to 45°C, slowly add 12g of isotridecyl alcohol polyoxyethylene ether, keep warm for 1 hour, and obtain mixture B.

[0070] S3. Slowly add 8g of ethylene glycol monotert-butyl ether to mixture B, keep warm for 2 hours, stir continuously and cool naturally to room temperature to obtain the water-soluble fertilizer anti-caking agent product.

[0071] Application of water-soluble fertilizer anti-caking agents in potassium dihydrogen phosphate and ammonium sulfate water-soluble fertilizers:

[0072] The bulk density of potassium dihydrogen phosphate and ammonium sulfate products before and after the addition of water-soluble fertilizer anti-caking agent was tested according to GB / T 23771-2009 standard:

[0073] Take 2000g of potassium dihydrogen phosphate and divide it into two portions using a sample divider. The bulk density of one portion was measured to be 1.13g / mL. Add 3.0g of the above-mentioned water-soluble fertilizer anti-caking agent to the other portion, mix well, and the bulk density is measured to be 1.06g / mL, which represents a decrease of 6.19%.

[0074] Take 2000g of ammonium sulfate and divide it into two portions using a sample divider. The bulk density of one portion was measured to be 1.02g / mL. The other portion was mixed with 1.5g of the water-soluble fertilizer anti-caking agent mentioned above. The mixture was then mixed thoroughly, and the bulk density was measured to be 0.93g / mL, representing a decrease of 8.82%.

[0075] Example 6

[0076] A water-soluble fertilizer anti-caking agent comprises the following raw materials by weight percentage: 35% dipropylene glycol ether, 25% dipropylene glycol ether, 4% ethylene glycol monotert-butyl ether, 15% isomeric tridecyl alcohol polyoxyethylene ether (EO number of 5), and 21% diethylene glycol ether.

[0077] A method for preparing a water-soluble fertilizer anti-caking agent includes the following steps:

[0078] S1. Mix 35g of dipropylene glycol ether, 25g of dipropylene glycol ether, and 21g of diethylene glycol ether, and stir to obtain mixture A.

[0079] S2. Heat mixture A in a water bath to 45°C, slowly add 15g of isotridecyl alcohol polyoxyethylene ether, keep warm for 1 hour, and obtain mixture B.

[0080] S3. Slowly add 4g of ethylene glycol monotert-butyl ether to mixture B, keep warm for 2 hours, stir continuously and cool naturally to room temperature to obtain the water-soluble fertilizer anti-caking agent product.

[0081] Application of water-soluble fertilizer anti-caking agents in Mannheim process potassium sulfate and NPK water-soluble fertilizers with a content of 30-10-10 macroelements:

[0082] The bulk density of potassium sulfate produced using the Mannheim process and water-soluble fertilizer with a nitrogen, phosphorus, and potassium content of 30-10-10, as tested according to GB / T 23771-2009 standard, and the addition of water-soluble fertilizer anti-caking agent to the product:

[0083] Take 2000g of potassium sulfate using the Mannheim method, divide it into two portions using a sample divider. The bulk density of one portion was measured to be 1.16g / mL. The other portion was mixed with 2.0g of the water-soluble fertilizer anti-caking agent mentioned above, and the bulk density was measured to be 1.01g / mL, a decrease of 12.93%.

[0084] 2000g of a water-soluble fertilizer with a nitrogen, phosphorus and potassium content of 30-10-10 was taken from the production line and divided into two portions using a sampler. One portion was tested and found to have a bulk density of 0.78g / mL. The other portion was mixed with 2.0g of the water-soluble fertilizer anti-caking agent and mixed evenly. The bulk density of the mixed portion was then tested and found to be 0.73g / mL, a decrease of 6.41%.

[0085] Example 7

[0086] A water-soluble fertilizer anti-caking agent comprises the following raw materials in weight percentage: 15% dipropylene glycol ether, 45% dipropylene glycol ether, 2% ethylene glycol monotert-butyl ether, 8% isomeric tridecyl alcohol polyoxyethylene ether (EO number of 5), and 30% diethylene glycol ether.

[0087] A method for preparing a water-soluble fertilizer anti-caking agent includes the following steps:

[0088] S1. Mix 15g of dipropylene glycol ether, 45g of dipropylene glycol ether, and 30g of diethylene glycol ether, and stir to obtain mixture A.

[0089] S2. Heat mixture A in a water bath to 45°C, slowly add 8g of isotridecyl alcohol polyoxyethylene ether, keep warm for 1 hour, and obtain mixture B.

[0090] S3. Slowly add 2g of ethylene glycol monotert-butyl ether to mixture B, keep warm for 2 hours, stir continuously and cool naturally to room temperature to obtain the water-soluble fertilizer anti-caking agent product.

[0091] Application of water-soluble fertilizer anti-caking agents in water-soluble fertilizers containing 20-20-20 NPK and 14-7-39 NPK:

[0092] The bulk density of water-soluble fertilizers with a nitrogen, phosphorus, and potassium content of 20-20-20 and water-soluble fertilizers with a nitrogen, phosphorus, and potassium content of 14-7-39, taken from the production line, was tested according to GB / T 23771-2009 standard before and after the addition of water-soluble fertilizer anti-caking agent:

[0093] 2000g of a water-soluble fertilizer with a nitrogen, phosphorus and potassium content of 20-20-20 was taken from the production line and divided into two portions using a sampler. The bulk density of one portion was measured to be 0.76g / mL. 2.0g of the water-soluble fertilizer anti-caking agent was added to the other portion, and after mixing evenly, the bulk density was measured to be 0.71g / mL, a decrease of 6.58%.

[0094] 2000g of water-soluble fertilizer containing 14-7-39 nitrogen, phosphorus and potassium was taken from the production line and divided into two portions using a sampler. The bulk density of one portion was measured to be 0.98g / mL. 3.0g of the water-soluble fertilizer anti-caking agent was added to the other portion, and after mixing evenly, the bulk density was measured again to be 0.89g / mL, a decrease of 9.18%.

[0095] Example 8

[0096] A water-soluble fertilizer anti-caking agent comprises the following raw materials in weight percentage: 15% dipropylene glycol ether, 25% dipropylene glycol ether, 10% ethylene glycol monotert-butyl ether, 10% isomeric tridecyl alcohol polyoxyethylene ether (EO number of 5), and 40% diethylene glycol ether.

[0097] A method for preparing a water-soluble fertilizer anti-caking agent includes the following steps:

[0098] S1. Mix 15g of dipropylene glycol ether, 25g of dipropylene glycol ether and 40g of diethylene glycol ether, and stir to obtain mixture A.

[0099] S2. Heat mixture A in a water bath to 45°C, slowly add 10g of isotridecyl alcohol polyoxyethylene ether, keep warm for 1 hour, and obtain mixture B.

[0100] S3. Slowly add 10g of ethylene glycol monotert-butyl ether to mixture B, keep warm for 2 hours, stir continuously and cool naturally to room temperature to obtain the water-soluble fertilizer anti-caking agent product.

[0101] Application of water-soluble fertilizer anti-caking agents in water-soluble fertilizers containing 10-40-10 NPK and 10-52-10 NPK:

[0102] The bulk density of water-soluble fertilizers with nitrogen, phosphorus, and potassium content of 10-40-10 and water-soluble fertilizer products with nitrogen, phosphorus, and potassium content of 10-52-10, taken from the production line, before and after the addition of water-soluble fertilizer anti-caking agent, was tested according to GB / T 23771-2009 standard:

[0103] 2000g of a water-soluble fertilizer with a nitrogen, phosphorus and potassium content of 10-40-10 was taken from the production line and divided into two portions using a sampler. The bulk density of one portion was measured to be 0.86g / mL. 2.5g of the water-soluble fertilizer anti-caking agent was added to the other portion, and after mixing evenly, the bulk density was measured again to be 0.77g / mL, which represents a decrease of 10.47%.

[0104] 2000g of water-soluble fertilizer with a nitrogen, phosphorus and potassium content of 10-52-10 was taken from the production line and divided into two using a sampler. One sample had a bulk density of 0.89g / mL. The other sample was mixed with 1.5g of the water-soluble fertilizer anti-caking agent and mixed evenly. The bulk density was measured again and found to be 0.82g / mL, a decrease of 7.87%.

[0105] Example 9

[0106] A water-soluble fertilizer anti-caking agent comprises the following raw materials in weight percentage: 30% dipropylene glycol ether, 35% dipropylene glycol ether, 3% ethylene glycol monotert-butyl ether, 7% isomeric tridecyl alcohol polyoxyethylene ether (EO number of 5), and 25% diethylene glycol ether.

[0107] A method for preparing a water-soluble fertilizer anti-caking agent includes the following steps:

[0108] S1. Mix 30g of dipropylene glycol ether, 35g of dipropylene glycol ether, and 25g of diethylene glycol ether, and stir to obtain mixture A.

[0109] S2. Heat mixture A in a water bath to 45°C, slowly add 7g of isotridecyl alcohol polyoxyethylene ether, keep warm for 1 hour, and obtain mixture B.

[0110] S3. Slowly add 3g of ethylene glycol monotert-butyl ether to mixture B, keep warm for 2 hours, stir continuously and cool naturally to room temperature to obtain the water-soluble fertilizer anti-caking agent product.

[0111] Application of water-soluble fertilizer anti-caking agent in the production of water-soluble fertilizers with a nitrogen, phosphorus, and potassium content of 20-20-20 in the workshop:

[0112] The workshop produces a water-soluble fertilizer with a nitrogen, phosphorus, and potassium content of 20-20-20, packaged in 25kg bags. Wooden pallets measuring 1.1m x 1.1m x 0.12m are used, with all four corners and sides perpendicular, the top flat, and no corners protruding from the pallet. Spacers are added between each layer, and seven layers of film are applied using a wrapping machine. The material height is measured on 10 pallets, and the average height is 101.5cm. A 1cm thick, 1.1m square wooden board is then placed on top, and a 2-ton weight is placed on top. After four months, the weight and board are removed, and the material height is measured again, averaging 98.4cm. One bag of material is then dropped parallel to the ground from a height of 1 meter onto a cement floor, then dropped again from the reverse side. The bag is opened and inspected, sieved, and any lumps larger than 1cm are weighed and their percentage of the total material is calculated. Ten bags are checked in parallel; the total weight of lumps larger than 1cm is 134.28kg, representing 53.7% of the total material.

[0113] The workshop produces a water-soluble fertilizer with a nitrogen, phosphorus, and potassium content of 20-20-20. 2.0 kg of anti-caking agent is added per ton of the product. The fertilizer is packaged in 25 kg units using wooden pallets with dimensions of 1.1 meters (length, width, and height) and 0.12 meters (width, height, and dimensions). All four corners and sides are perpendicular, the top is flat, and all edges are not protruding from the pallet. Spacers are added between each layer, and 7 layers of film are applied using a wrapping machine. The material height is measured on 10 pallets, and the average height is 108.3 cm. A 1 cm thick, 1.1-meter (length, width, and height) square wooden board is placed on top, and a 2-ton weight is placed on the board. After 4 months, the weight and board are removed, and the material height is measured again; the average height is 103.7 cm. Take a bag of material, place it parallel to the ground, and let it fall naturally 1 meter onto the cement floor. Then let it fall naturally again from the reverse side. Open the bag and inspect it. Sift it and weigh any lumps larger than 1 cm. Calculate the percentage of lumps in the total material. Check 10 bags in parallel. The total weight of lumps larger than 1 cm is 32.18 kg, and the percentage of lumps is 12.9%.

[0114] Example 10

[0115] A water-soluble fertilizer anti-caking agent comprises the following raw materials by weight percentage: 25% dipropylene glycol ether, 30% dipropylene glycol ether, 10% ethylene glycol monotert-butyl ether, 10% isomeric tridecyl alcohol polyoxyethylene ether (EO number of 5), and 25% diethylene glycol ether.

[0116] A method for preparing a water-soluble fertilizer anti-caking agent includes the following steps:

[0117] S1. Mix 25g of dipropylene glycol ether, 30g of dipropylene glycol ether, and 25g of diethylene glycol ether, and stir to obtain mixture A;

[0118] S2. Heat mixture A in a water bath to 45°C, slowly add 10g of isotridecyl alcohol polyoxyethylene ether, keep warm for 1 hour, and obtain mixture B.

[0119] S3. Slowly add 10g of ethylene glycol monotert-butyl ether to mixture B, keep warm for 2 hours, stir continuously and cool naturally to room temperature to obtain the water-soluble fertilizer anti-caking agent product.

[0120] Application of water-soluble fertilizer anti-caking agent in the production of water-soluble fertilizers with a nitrogen, phosphorus, and potassium content of 24-8-24 macroelements in the workshop:

[0121] The workshop produces a water-soluble fertilizer with a nitrogen, phosphorus, and potassium content of 24-8-24, packaged in 25kg bags. It uses wooden pallets with dimensions of 1.1m, 1.1m, and 0.12m, with all four corners and sides perpendicular and the top flat. All edges and corners are not extended beyond the pallet. Each layer is fitted with a pad and upper and lower pads. The pallets are wrapped with 7 layers of film using a wrapping machine and stacked on top of each other.

[0122] The workshop produces 24-8-24 finished water-soluble fertilizer. 2.0kg of anti-caking agent is added to each ton of the product. It is packaged in 25kg packages using wooden pallets with dimensions of 1.1m, 1.1m, and 0.12m. The pallets are designed with four vertical corners and sides, a flat top, and no corners protruding from the pallet. Spacers are added between each layer, and seven layers of film are applied using a wrapping machine. Two pallets are stacked on top of each other.

[0123] The two types of materials were stored side by side. After three days, the height was measured. The height of the lower pallet material, including the pallet, was 102.4 cm without the added water-soluble fertilizer anti-caking agent and 119.8 cm with the added water-soluble fertilizer anti-caking agent.

[0124] Example 11

[0125] A water-soluble fertilizer anti-caking agent comprises the following raw materials by weight percentage: 40% dipropylene glycol ether, 25% dipropylene glycol ether, 5% ethylene glycol monotert-butyl ether, 15% isomeric tridecyl alcohol polyoxyethylene ether (EO number of 5), and 15% diethylene glycol ether.

[0126] A method for preparing a water-soluble fertilizer anti-caking agent includes the following steps:

[0127] S1. Mix 35g of dipropylene glycol ether, 25g of dipropylene glycol ether, and 15g of diethylene glycol ether, and stir to obtain mixture A.

[0128] S2. Heat mixture A in a water bath to 45°C, slowly add 15g of isotridecyl alcohol polyoxyethylene ether, keep warm for 1 hour, and obtain mixture B.

[0129] S3. Slowly add 5g of ethylene glycol monotert-butyl ether to mixture B, keep warm for 2 hours, stir continuously and cool naturally to room temperature to obtain the water-soluble fertilizer anti-caking agent product.

[0130] Application of water-soluble fertilizer anti-caking agent in the production of water-soluble fertilizers with a nitrogen, phosphorus, and potassium content of 13-5-40 macroelements in the workshop:

[0131] The workshop produces a water-soluble fertilizer with a nitrogen, phosphorus, and potassium content of 13-5-40, packaged in 25kg bags. The bags are made on wooden pallets with dimensions of 1.1m x 1.1m x 0.12m, with all four corners and sides perpendicular and the top flat. All edges and corners are not extended beyond the pallet. Each layer is reinforced with pads and top and bottom pads. The bags are wrapped with 7 layers of film using a wrapping machine, and two pallets are stacked on top of each other.

[0132] The workshop produces a water-soluble fertilizer with a nitrogen, phosphorus, and potassium content of 13-5-40. 1.0 kg of anti-caking agent is added per ton of the product, packaged in 25 kg bags. Wooden pallets with dimensions of 1.1 meters (length), 1.1 meters (width), and 0.12 meters (height) are used, with all four corners and sides perpendicular, the top flat, and all edges not extending beyond the pallet. Spacers are added between each layer, and seven layers of film are applied using a wrapping machine. Two pallets are stacked on top of each other.

[0133] The two types of materials were stored side by side. After three days, the height was measured. The height of the material on the lower pallet, including the pallet, was 86.1 cm for the water-soluble fertilizer without the product's anti-caking agent and 89.5 cm for the water-soluble fertilizer with the product's anti-caking agent.

[0134] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A water-soluble fertilizer anti-caking agent, characterized in that, It is composed of the following raw materials by mass percentage: 10%~50% dipropylene glycol ether, 5%~50% dipropylene glycol ether, 2%~10% ethylene glycol monotert-butyl ether, 5%~15% isotridecyl alcohol polyoxyethylene ether, and 10%~40% diethylene glycol ether, wherein the isotridecyl alcohol polyoxyethylene ether has an EO number of 5~10.

2. The preparation method of a water-soluble fertilizer anti-caking agent according to claim 1, characterized in that, Includes the following steps: S1. Mix dipropylene glycol ether, dipropylene glycol ether, and diethylene glycol ether, and stir to obtain mixture A; S2. Heat mixture A to 40~50℃, add isotridecyl alcohol polyoxyethylene ether dropwise, keep warm, and obtain mixture B; S3. Add ethylene glycol monotert-butyl ether to mixture B, keep warm at 40~50℃, and cool to room temperature to obtain water-soluble fertilizer anti-caking agent.

3. The preparation method of a water-soluble fertilizer anti-caking agent according to claim 2, characterized in that, The heat preservation time in step S2 is 0.5~1.5h.

4. The preparation method of a water-soluble fertilizer anti-caking agent according to claim 2, characterized in that, The heat preservation time in step S3 is 0.5~3h.

5. The preparation method of a water-soluble fertilizer anti-caking agent according to claim 2, characterized in that, The heat preservation time in step S3 is 1~3 hours.

6. The application of the water-soluble fertilizer anti-caking agent according to claim 1 or the water-soluble fertilizer anti-caking agent prepared by any one of claims 2 to 5 in water-soluble fertilizer, wherein the amount of water-soluble fertilizer anti-caking agent added is 0.1% to 0.5% of the mass of water-soluble fertilizer.

7. The application of the water-soluble fertilizer anti-caking agent according to claim 6 in water-soluble fertilizer, wherein the amount of water-soluble fertilizer anti-caking agent added is 0.1% to 0.3% of the mass of water-soluble fertilizer.

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