Needle-shaped water-soluble fertilizer anti-blocking agent as well as preparation method and application thereof

Abstract

The invention discloses a needle-shaped water-soluble fertilizer anti-blocking agent and a preparation method and application thereof, and relates to the technical field of anti-blocking agents, the needle-shaped water-soluble fertilizer anti-blocking agent comprises the following raw material components by mass: 10.0-30.0% of water-soluble polyvinylpyrrolidone, 10.0-30.0% of water-soluble phosphate, 10.0-30.0% of water-soluble phosphate, 10.0-30.0% of water- 15.0% to 25.0% of dodecyl amine acetate; 3.0 to 8.0% of ethylene bis (stearamide); 5.0 to 9.0 percent of isooctanol polyoxyethylene ether (3) phosphate ester; 1.0 to 5.0 percent of sodium polyacrylate with low polymerization degree; and the balance of water; the sum of the mass percentages of all the components is 100%. The anti-blocking agent provided by the invention is excellent in performance, and the needle-shaped water-soluble fertilizer can be kept loose within 3-6 months (in a normal state) after being added with the anti-blocking agent provided by the invention.

Description

Technical Field

[0001] The invention relates to the technical field of anti-caking agents, and more specifically to a needle-shaped water-soluble fertilizer anti-caking agent and a preparation method and application technology thereof. Background Art

[0002] Compared with single-element fertilizers, compound fertilizers, especially new compound fertilizers, have higher utilization rates, faster nutrient absorption, and less pollution to the soil environment, which has led to increasing industry recognition in recent years. With the development of the agricultural industry and the adjustment of the planting structure, the product structure and formula of compound fertilizers are also constantly changing. In recent years, my country's compound fertilizer industry is accelerating its transformation and upgrading, increasing the research and development and production of green, efficient and new fertilizers to meet the diversified needs of agricultural production. The scale of my country's compound fertilizer market has increased from 114.21 billion yuan in 2015 to 216.5 billion yuan in 2022, with an annual compound growth rate of about 9.56%, maintaining a relatively fast development speed overall.

[0003] Needle-shaped water-soluble fertilizer is a new form of fertilizer that has appeared on the market in recent years. It is a granular fertilizer with a needle-shaped appearance produced by a unique preparation process. The core features of this process product are needle-shaped appearance, strong water solubility, and flexible formula. There are mainly various varieties such as granular water-soluble fertilizer, compound fertilizer, organic fertilizer, and single fertilizer. The product is widely used in various fertilization methods, such as drip irrigation, sprinkler irrigation, flushing, broadcasting, and buried fertilization. It can meet the soil testing and formula fertilization needs of modern agriculture and easily meet the customized product needs of customers and users. Based on the excellent water solubility and flexible formula of the product, it can significantly improve the efficiency of fertilization, save fertilizer and water, improve nutrient utilization, and reduce fertilizer costs. It is suitable for both ordinary growers and large-scale growers. It has very good development prospects.

[0004] Since needle-shaped water-soluble fertilizer is a new type of compound fertilizer, it is different from the granular or powdered form of traditional fertilizers. Its appearance is a strip needle (i.e. a cylindrical form with a smaller diameter). This form has a large specific surface area, is easy to absorb moisture, and has a rough surface. According to the capillary theory, most fertilizer components have strong hygroscopicity. When the external environment of the particles changes, due to the large number of capillaries in the particles themselves, under the action of the surface tension of the surface layer, the particles in contact with each other will migrate, resulting in cross-linking and bonding to form agglomerates. And the crystal bridge theory, when the water inside or outside the fertilizer particles is transferred, it will drive the various salts dissolved in them to move together. In the process of mutual movement, it is inevitable that the salts will crystallize to new places due to changes in the environment. This process occurs repeatedly. As time goes by, these crystals combine with each other to form crystal bridges, which bond the fertilizer particles together and gradually form large agglomerates. Therefore, due to the large specific surface area and rough surface of the needle-shaped fertilizer, more capillaries will be cross-linked and bonded in the fertilizer during storage and transportation, and there will be a greater probability of internal salt crystallization and recrystallization, thus causing the agglomeration problem of the needle-shaped fertilizer. This is also a major technical problem that domestic needle-shaped fertilizer manufacturers are urgently seeking solutions to.

[0005] At present, the domestic production capacity of needle-shaped water-soluble fertilizers has exceeded 1.05 million tons / year. Many large traditional compound fertilizer companies and emerging compound fertilizer manufacturers are vigorously planning and building new needle-shaped water-soluble fertilizer projects.

[0006] Traditional fertilizer anti-caking agents are developed, tested and applied based on the traditional fertilizer form, and are more suitable for existing granular fertilizers and powdered fertilizers. However, for the new form of needle-shaped fertilizers, due to their characteristics of strip-shaped needles, large specific surface area, easy moisture absorption, and rough surface, traditional fertilizer anti-caking agents have shortcomings such as poor spreading performance, poor coating performance or ineffective coating, and do not yet have the corresponding solution capabilities.

[0007] At present, there is no anti-caking agent for needle-shaped water-soluble fertilizers. Summary of the invention

[0008] The purpose of the present invention is to solve the technical problem that traditional fertilizer anti-caking agents have poor spreading performance, poor coating performance or cannot effectively coat and are not suitable for needle-shaped water-soluble fertilizers. The present invention provides a needle-shaped water-soluble fertilizer anti-caking agent and a preparation method and application thereof.

[0009] In order to achieve the above-mentioned purpose, the present invention specifically adopts the following technical solutions:

[0010] The first aspect of the present invention provides a needle-shaped water-soluble fertilizer anti-caking agent, which comprises the following raw material components by mass percentage:

[0011]

[0012] The sum of all component mass percentages is 100%.

[0013] Specifically, water-soluble polyvinyl pyrrolidone, dodecylamine acetate, vinyl bisstearamide, isooctyl alcohol polyoxyethylene ether (3) phosphate, and low-polymerization sodium polyacrylate are all surfactants, and their simultaneous use has a synergistic effect. As an anti-caking agent, the key role of surfactants is to change the surface structure of fertilizers, reduce surface energy, increase hydrophobicity, prevent water exchange, and protect particles from external moisture; reduce the surface tension of the solution, thereby reducing the capillary adsorption of crystals on the solution; improve the crystallization habit of fertilizers, greatly reduce the interfacial energy of fertilizer crystals, inhibit nucleation, and improve crystal growth. In use, a composite compound is generally used. As a synthetic water-soluble polymer compound, water-soluble polyvinyl pyrrolidone has the general properties of water-soluble polymer compounds and is a non-ionic surfactant with excellent dispersibility and film-forming properties. Dodecylamine acetate mainly plays the role of anti-caking agent and is used in fertilizer anti-caking agent. It has excellent solubility characteristics in aqueous environment and oil-water mixed environment. More importantly, it can be used in the production of water-soluble anti-caking agents, especially suitable for the solubility requirements of drip irrigation fertilizer anti-caking agents. Vinyl bisstearamide is used as anti-caking agent and dispersant. Compared with traditional lubricants such as polyethylene wax and stearate, it not only has a good external lubrication effect, but also has a good internal lubrication effect. It can effectively improve the fluidity and smoothness of fertilizer particles, thereby improving the appearance quality of fertilizer, reducing energy consumption, and making the product have extremely high surface smoothness and smoothness. Isooctyl alcohol polyoxyethylene ether (3) phosphate is a yellow transparent liquid with good water solubility. It acts as a penetrant and spreading agent, which can reduce surface tension and improve the penetration ability of anti-caking agents. Low-polymerization sodium polyacrylate is a colorless to yellow transparent liquid that is easily soluble in water. It is a water-soluble polymer compound that can reduce or avoid the agglomeration phenomenon between fertilizer particles and facilitate the uniform application of fertilizer. Its main use in agriculture is to enhance the dispersion ability of fertilizer particles and prevent agglomeration.

[0014] In one embodiment, the following raw material components are included in percentage by mass:

[0015]

[0016] The sum of all component mass percentages is 100%.

[0017] In one embodiment, the molecular formula of water-soluble polyvinyl pyrrolidone is (C 6 H 9 NO) n , the viscosity average relative molecular weight is 1000-5000, where n is 10-50.

[0018] In one embodiment, the molecular formula of low-polymerization sodium polyacrylate is (C 3 H 3 NaO 2 ) n , the viscosity average relative molecular weight is 500-5000, where n is 5-60.

[0019] The second aspect of the present invention provides a method for preparing a needle-shaped water-soluble fertilizer anti-caking agent, which is used to prepare the above-mentioned needle-shaped water-soluble fertilizer anti-caking agent. The method comprises the following steps:

[0020] S1, mixing the water-soluble polyvinyl pyrrolidone and dodecylamine acetate in the formula amount under heating conditions, and then adding isooctyl alcohol polyoxyethylene ether (3) phosphate, and fully mixing with the first mixture;

[0021] S2, heating the first mixture and adding the formulated amount of vinyl bisstearamide, water and low-polymerization sodium polyacrylate, mixing and stirring to react evenly and then keeping warm to obtain a second mixture, and cooling the second mixture to obtain a finished anti-caking agent.

[0022] Specifically, the anti-caking agent is prepared by mixing a formula amount of water-soluble polyvinyl pyrrolidone, dodecylamine acetate, vinyl bisstearamide, isooctyl alcohol polyoxyethylene ether (3) phosphate, low-polymerization sodium polyacrylate and water, and the sum of the mass percentages of the components is 100%.

[0023] In one embodiment, in step S1, water-soluble polyvinyl pyrrolidone and dodecylamine acetate are taken in proportion and added to a reaction kettle equipped with a stirring and temperature raising and lowering device, heated to 40-60° C., and isooctyl alcohol polyoxyethylene ether (3) phosphate is added, and stirred during the addition process to fully mix, and fully mixed into the first mixture;

[0024] In step S2, the first mixture is heated to 60°C to 80°C, vinyl bisstearamide and water are added under continuous stirring, and after mixing, the mixture is kept warm and stirred at 60°C to 80°C for 30min to 60min, then cooled to 40°C to 60°C, low-polymerization sodium polyacrylate is added, and stirred at 40°C to 60°C for 10min to 30min to obtain a second fused mixture; the above-mentioned second fused mixture is cooled to 30°C to 40°C to obtain a finished anti-caking agent.

[0025] The third aspect of the present invention provides an application of a needle-shaped water-soluble fertilizer anti-caking agent in a needle-shaped water-soluble fertilizer, the anti-caking agent is prepared by using the above-mentioned needle-shaped water-soluble fertilizer anti-caking agent or the above-mentioned method for preparing an anti-caking agent for a needle-shaped water-soluble fertilizer, and the amount of the anti-caking agent added to the needle-shaped water-soluble fertilizer is 1‰-3‰. When used, the anti-caking agent and the needle-shaped water-soluble fertilizer are evenly mixed.

[0026] In one embodiment, the anti-caking agent is mixed in a manner that the anti-caking agent is added into a granulator and uniformly mixed with the components of the needle-shaped water-soluble fertilizer in the granulator.

[0027] In one embodiment, the anti-caking agent is mixed in such a way that the anti-caking agent is evenly sprayed on the surface of the needle-shaped water-soluble fertilizer at the discharge port of the granulator.

[0028] The beneficial effects of the present invention are as follows:

[0029] 1. In the anti-caking agent of the present invention, the molecular weight of the water-soluble polyvinyl pyrrolidone is 1000-5000, and the molecular weight of the low-polymerization sodium polyacrylate is 500-5000. Among them, the water-soluble polyvinyl pyrrolidone, dodecylamine acetate, vinyl bisstearamide, isooctyl alcohol polyoxyethylene ether (3) phosphate, and low-polymerization sodium polyacrylate are all surfactants, and their simultaneous use has a synergistic effect. Surfactants are used as anti-caking agents, and are generally used in a composite form.

[0030] 2. The proportion of each component content of the anti-caking agent provided by the present invention is obtained through a large amount of experimental data demonstration. If one of the components exceeds the range, the anti-caking effect of the anti-caking agent is not good. For example, in the comparative example, when the mass ratio of water-soluble polyvinyl pyrrolidone in comparative examples 1 and 2 and isooctyl alcohol polyoxyethylene ether (3) phosphate in comparative example 3 exceeds the range described in the present invention, the anti-caking effect of the anti-caking agent is sharply reduced. In comparative example 4, when a commercially available traditional anti-caking agent is used to treat needle-shaped water-soluble fertilizers, the anti-caking effect is not good.

[0031] 3. The anti-caking agent provided by the present invention has excellent performance. The needle-shaped water-soluble fertilizer can remain loose within 3 to 6 months (under normal conditions) after adding the anti-caking agent provided by the present invention. The anti-caking agent provided by the present invention will not affect the quality of the needle-shaped water-soluble fertilizer. After being dissolved in water, the pH value is 6 to 7, and the pH value of the needle-shaped water-soluble fertilizer solution will not be significantly changed. When the needle-shaped water-soluble fertilizer is used for agricultural fertilization, it will not harm the land and crops, and will not have a negative impact on the use of the needle-shaped water-soluble fertilizer. DETAILED DESCRIPTION

[0032] In order to make the technical problems, technical solutions and technical effects of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in combination with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0033] Therefore, the detailed description of the embodiments of the present invention provided below is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] Example 1

[0035] This embodiment provides a needle-shaped water-soluble fertilizer anti-caking agent, which includes the following raw material components by mass percentage:

[0036]

[0037]

[0038] The preparation method of the anti-caking agent is as follows: water-soluble polyvinyl pyrrolidone and dodecylamine acetate are added to a reaction kettle, stirred and heated to 60°C, isooctyl alcohol polyoxyethylene ether (3) phosphate is added while keeping the temperature, and the mixture is fully mixed, and the mixture is stirred and heated to 80°C, and vinyl bisstearamide and water are added, and the mixture is stirred for 60 minutes to form a uniform solution, and then the temperature is lowered to 60°C, and low-polymerization sodium polyacrylate is added, and the mixture is stirred for 30 minutes. The temperature is lowered to 40°C to obtain a finished product (anti-caking agent 1).

[0039] Mixing method: The anti-caking agent is added into the granulator and evenly mixed with the components of the needle-shaped water-soluble fertilizer in the granulator.

[0040] Example 2

[0041] This embodiment provides a needle-shaped water-soluble fertilizer anti-caking agent, which includes the following raw material components by mass percentage:

[0042]

[0043] The preparation method of the anti-caking agent is as follows: water-soluble polyvinyl pyrrolidone and dodecylamine acetate are added to a reaction kettle, stirred and heated to 40°C, isooctyl alcohol polyoxyethylene ether (3) phosphate is added while keeping the temperature, the mixture is fully mixed, the mixture is stirred and heated to 60°C, vinyl bisstearamide and water are added, the mixture is stirred for 30 minutes to form a uniform solution, the temperature is then lowered to 40°C, low-polymerization sodium polyacrylate is added, and the mixture is stirred for 10 minutes. The temperature is lowered to 30°C to obtain a finished product (anti-caking agent 2).

[0044] Mixing method: The anti-caking agent is added into the granulator and evenly mixed with the components of the needle-shaped water-soluble fertilizer in the granulator.

[0045] Example 3

[0046] This embodiment provides a needle-shaped water-soluble fertilizer anti-caking agent, which includes the following raw material components by mass percentage:

[0047]

[0048] The preparation method of the anti-caking agent comprises the following steps: adding water-soluble polyvinyl pyrrolidone and dodecylamine acetate into a reaction kettle, stirring and heating to 50°C, adding isooctyl alcohol polyoxyethylene ether (3) phosphate while keeping the temperature, mixing them thoroughly, continuing stirring and heating to 70°C, adding vinyl bisstearamide and water, stirring for 50 minutes to form a uniform solution, then cooling to 50°C, adding low-polymerization sodium polyacrylate, stirring for 20 minutes, cooling to 35°C, and obtaining a finished product (anti-caking agent 3).

[0049] Mixing method: The anti-caking agent is evenly sprayed on the surface of the needle-shaped water-soluble fertilizer at the discharge port of the granulator.

[0050] Example 4

[0051] This embodiment provides a needle-shaped water-soluble fertilizer anti-caking agent, which includes the following raw material components by mass percentage:

[0052]

[0053]

[0054] The preparation method of the anti-caking agent is as follows: water-soluble polyvinyl pyrrolidone and dodecylamine acetate are added to a reaction kettle, stirred and heated to 45°C, isooctyl alcohol polyoxyethylene ether (3) phosphate is added while keeping the temperature, the mixture is fully mixed, the mixture is stirred and heated to 65°C, vinyl bisstearamide and water are added, the mixture is stirred for 40 minutes to form a uniform solution, the mixture is cooled to 45°C, low-polymerization sodium polyacrylate is added, and the mixture is stirred for 15 minutes. The mixture is cooled to 30°C to obtain a finished product (anti-caking agent 4).

[0055] Mixing method: The anti-caking agent is added into the granulator and evenly mixed with the components of the needle-shaped water-soluble fertilizer in the granulator.

[0056] Example 5

[0057] This embodiment provides a needle-shaped water-soluble fertilizer anti-caking agent, which includes the following raw material components by mass percentage:

[0058]

[0059] The preparation method of the anti-caking agent is as follows: water-soluble polyvinyl pyrrolidone and dodecylamine acetate are added to a reaction kettle, stirred and heated to 50°C, isooctyl alcohol polyoxyethylene ether (3) phosphate is added while keeping the temperature, the mixture is fully mixed, the mixture is stirred and heated to 70°C, vinyl bisstearamide and water are added, the mixture is stirred for 45 minutes to form a uniform solution, the mixture is cooled to 50°C, low-polymerization sodium polyacrylate is added, and the mixture is stirred for 20 minutes. The mixture is cooled to 25°C to obtain a finished product (anti-caking agent 5).

[0060] Mixing method: The anti-caking agent is evenly sprayed on the surface of the needle-shaped water-soluble fertilizer at the discharge port of the granulator.

[0061] Example 6

[0062] This embodiment provides a needle-shaped water-soluble fertilizer anti-caking agent, which includes the following raw material components by mass percentage:

[0063]

[0064] The preparation method of the anti-caking agent is as follows: water-soluble polyvinyl pyrrolidone and dodecylamine acetate are added to a reaction kettle, stirred and heated to 55°C, isooctyl alcohol polyoxyethylene ether (3) phosphate is added while keeping the temperature, the mixture is fully mixed, the mixture is stirred and heated to 75°C, vinyl bisstearamide and water are added, the mixture is stirred for 50 minutes to form a uniform solution, the mixture is cooled to 55°C, low-polymerization sodium polyacrylate is added, and the mixture is stirred for 25 minutes. The mixture is cooled to 35°C to obtain a finished product (anti-caking agent 6).

[0065] Mixing method: The anti-caking agent is added into the granulator and evenly mixed with the components of the needle-shaped water-soluble fertilizer in the granulator.

[0066] Comparative Example 1

[0067] This comparative example provides a needle-shaped water-soluble fertilizer anti-caking agent, which includes the following raw material components by mass percentage:

[0068]

[0069]

[0070] Preparation of anti-caking agent: Add water-soluble polyvinyl pyrrolidone and dodecylamine acetate into a reaction kettle, stir and heat to 60°C, add isooctyl alcohol polyoxyethylene ether (3) phosphate, mix thoroughly, continue stirring and heat to 65°C, add vinyl bisstearamide and water, continue stirring for 35 minutes to form a uniform solution, then cool to 45°C, add low-polymerization sodium polyacrylate, stir for 20 minutes. Cool to 30°C to obtain the finished product (anti-caking agent 7).

[0071] Mixing method: The anti-caking agent is evenly sprayed on the surface of the needle-shaped water-soluble fertilizer at the discharge port of the granulator.

[0072] Comparative Example 2

[0073] This comparative example provides a needle-shaped water-soluble fertilizer anti-caking agent, which includes the following raw material components by mass percentage:

[0074]

[0075] The preparation method of the anti-caking agent is as follows: water-soluble polyvinyl pyrrolidone and dodecylamine acetate are added to a reaction kettle, stirred and heated to 60°C, isooctyl alcohol polyoxyethylene ether (3) phosphate is added while keeping the temperature, the mixture is fully mixed, the mixture is stirred and heated to 70°C, vinyl bisstearamide and water are added, the mixture is stirred for 40 minutes to form a uniform solution, the temperature is then lowered to 55°C, low-polymerization sodium polyacrylate is added, and the mixture is stirred for 25 minutes. The temperature is lowered to 40°C to obtain a finished product (anti-caking agent 8).

[0076] Mixing method: The anti-caking agent is added into the granulator and evenly mixed with the components of the needle-shaped water-soluble fertilizer in the granulator.

[0077] Comparative Example 3

[0078] This comparative example provides a needle-shaped water-soluble fertilizer anti-caking agent, which includes the following raw material components by mass percentage:

[0079]

[0080] The preparation method of the anti-caking agent is as follows: water-soluble polyvinyl pyrrolidone and dodecylamine acetate are added to a reaction kettle, stirred and heated to 60°C, isooctyl alcohol polyoxyethylene ether (3) phosphate is added while keeping the temperature, the mixture is fully mixed, the mixture is stirred and heated to 75°C, vinyl bisstearamide and water are added, the mixture is stirred for 50 minutes to form a uniform solution, the mixture is cooled to 50°C, low-polymerization sodium polyacrylate is added, and the mixture is stirred for 30 minutes. The mixture is cooled to 35°C to obtain a finished product (anti-caking agent 9).

[0081] Mixing method: The anti-caking agent is evenly sprayed on the surface of the needle-shaped water-soluble fertilizer at the discharge port of the granulator.

[0082] Comparative Example 4

[0083] This comparative example provides a commercially available traditional fertilizer anti-caking agent for comparative experiments.

[0084] Mixing method: The anti-caking agent is evenly sprayed on the surface of the needle-shaped water-soluble fertilizer at the discharge port of the granulator.

[0085] Test results

[0086] The anti-caking agents of the above-mentioned embodiments and comparative examples are mixed into the production process of the test needle-shaped water-soluble fertilizer according to a certain amount of addition, and are formed into a Φ50×70mm cylinder under a pressure of 1.5MPa, and then placed in a test box at 80% RH and a temperature of 60°C for 12 hours under this pressure; then placed in an environment of 60% RH and a temperature of 40°C for 12 hours under this pressure, and this cycle is repeated four times, and then placed at room temperature for 24 hours to obtain a sample; then this sample is placed on an electronic pressure testing machine to measure its crushing pressure. The greater the pressure required for crushing, the more serious the agglomeration is, and the worse the effect of the anti-caking agent is.

[0087] The needle-shaped water-soluble fertilizer products obtained by adding the anti-caking agents of the above embodiments and comparative examples were subjected to crushing pressure tests, and the test results are shown in Tables 1 and 2.

[0088] Table 1 Agglomeration crushing pressure data when the anti-caking agent addition amount is 2.0 (kg / T)

[0089] Anti-caking agent Addition amount (kg / T) Crushing pressure (Newton) Example 1 Anti-caking agent 1 2.0 75 Example 2 Anti-caking agent 2 2.0 64 Example 3 Anti-caking agent 3 2.0 85 Example 4 Anti-caking agent 4 2.0 73 Example 5 Anti-caking agent 5 2.0 80 Example 6 Anti-caking agent 6 2.0 69 Comparative Example 1 Anti-caking agent 7 2.0 97 Comparative Example 2 Anti-caking agent 8 2.0 103 Comparative Example 3 Anti-caking agent 9 2.0 112 Comparative Example 4 Anti-caking agent 10 2.0 207 Blank control blank —— 238

[0090] Table 2 Agglomeration crushing pressure data when the anti-caking agent addition amount is 3.0 (kg / T)

[0091]

[0092]

[0093] The test results show that the needle-shaped water-soluble fertilizer product to which the anti-caking agent of the present invention is added has a caking crushing pressure greatly reduced relative to the blank control under the same pressing conditions as the ambient temperature, humidity and pressure conditions. Meanwhile, in the anti-caking agent system formula, the different ratios of its components play a very important role in the performance of its anti-caking performance. The anti-caking agent in this ratio range, after testing, shows that the anti-caking agent of the present invention is added to significantly reduce the caking phenomenon of the needle-shaped water-soluble fertilizer, and achieve the anti-caking effect of the needle-shaped water-soluble fertilizer. And the anti-caking agent in the comparative example beyond the ratio range of the present invention, although there is also a certain anti-caking performance, the effect is far from the ideal state.

Claims

1. A needle-shaped water-soluble fertilizer anti-caking agent, characterized in that: In terms of mass percentage, it includes the following raw material components: and the balance of water; The sum of all component mass percentages is 100%.

2. A needle-shaped water-soluble fertilizer anti-caking agent according to claim 1, characterized in that, In terms of mass percentage, it includes the following raw material components: and the balance of water; The sum of all component mass percentages is 100%.

3. A needle-shaped water-soluble fertilizer anti-caking agent according to claim 1 or 2, characterized in that, The molecular formula of water-soluble polyvinyl pyrrolidone is (C6H9NO) n , the viscosity average relative molecular weight is 1000-5000, where n is 10-50.

4. A needle-shaped water-soluble fertilizer anti-caking agent according to claim 1 or 2, characterized in that, The molecular formula of low-polymerization sodium polyacrylate is (C3H3NaO2) n , the viscosity average relative molecular weight is 500-5000, where n is 5-60.

5. A method for preparing a needle-shaped water-soluble fertilizer anti-caking agent, characterized in that: Used to prepare a needle-shaped water-soluble fertilizer anti-caking agent as described in any one of claims 1 to 4.

6. The method for preparing a needle-shaped water-soluble fertilizer anti-caking agent according to claim 5, characterized in that: The following steps are involved: S1, mixing the water-soluble polyvinyl pyrrolidone and dodecylamine acetate in the formula amount under heating conditions, and then adding isooctyl alcohol polyoxyethylene ether (3) phosphate, and fully mixing with the first mixture; S2, heating the first mixture and adding the formulated amount of vinyl bisstearamide, water and low-polymerization sodium polyacrylate, mixing and stirring to react evenly and then keeping warm to obtain a second mixture, and cooling the second mixture to obtain a finished anti-caking agent.

7. The method for preparing a needle-shaped water-soluble fertilizer anti-caking agent according to claim 6, characterized in that: In step S1, water-soluble polyvinyl pyrrolidone and dodecylamine acetate are taken in proportion and added into a reaction kettle equipped with a stirring and temperature raising and lowering device, and heated to 40-60° C., and isooctyl alcohol polyoxyethylene ether (3) phosphate is added, and stirred during the addition process to fully mix, and fully mixed into the first mixture; In step S2, the first mixture is heated to 60°C to 80°C, vinyl bisstearamide and water are added under continuous stirring, and after mixing, the mixture is kept warm and stirred at 60°C to 80°C for 30min to 60min, then cooled to 40°C to 60°C, low-polymerization sodium polyacrylate is added, and stirred at 40°C to 60°C for 10min to 30min to obtain a second fused mixture; the above-mentioned second fused mixture is cooled to 30°C to 40°C to obtain a finished anti-caking agent.

8. Use of a needle-shaped water-soluble fertilizer anti-caking agent in a needle-shaped water-soluble fertilizer, the anti-caking agent prepared by the needle-shaped water-soluble fertilizer anti-caking agent according to any one of claims 1 to 5 or the method for preparing the needle-shaped water-soluble fertilizer anti-caking agent according to any one of claims 1 to 5, characterized in that: The amount of anti-caking agent added to the needle-shaped water-soluble fertilizer is 1‰-3‰.

9. The use of a needle-shaped water-soluble fertilizer anti-caking agent in needle-shaped water-soluble fertilizer according to claim 8, characterized in that: The anti-caking agent is mixed in a manner that the anti-caking agent is added into a granulator and uniformly mixed with various components of the needle-shaped water-soluble fertilizer in the granulator.

10. Use of the needle-shaped water-soluble fertilizer anti-caking agent according to claim 8 in needle-shaped water-soluble fertilizer, characterized in that: The anti-caking agent is mixed in such a way that the anti-caking agent is evenly sprayed on the surface of the needle-shaped water-soluble fertilizer at the discharge port of the granulator.

Images