Novel ammonium chloride anti-blocking agent

Abstract

The invention relates to an anti-blocking agent special for ammonium chloride. The main components of the anti-blocking agent comprise fatty alcohol ether phosphate potassium salt, a water-soluble high-molecular polymer and a preservative. The use method is very simple and convenient, the cost is low, and the performance is excellent. In addition, the paint does not pollute the environment and can be stored for a long time. According to the invention, the use method of the anti-blocking agent comprises the following steps: diluting water to a concentration of 2%-3%, and then spraying the diluted anti-blocking agent on ammonium chloride in a granulation process in a uniform atomization manner. It needs to be noted that the adding amount of the anti-blocking agent needs to be properly adjusted according to the sizes of ammonium chloride particles and different storage environments so as to ensure that the optimal anti-blocking effect can be achieved.

Description

[0001] The invention belongs to the field of agricultural chemical fertilizer additives, and particularly relates to a technology for preventing ammonium chloride from agglomerating due to moisture absorption, an anti-caking agent for ammonium chloride with strong hygroscopicity and an application of the anti-caking agent in the preparation of anti-caking ammonium chloride. Technical Background

[0002] With the continuous growth of the global population and the improvement of agricultural production efficiency, the demand for fertilizers has shown an upward trend accordingly; in particular, the market demand for ammonium chloride is increasingly strong, and its output and varieties are showing a diversified development trend. However, during the storage and transportation of ammonium chloride, due to the fluctuations of environmental factors such as temperature, humidity, and pressure, the surface of ammonium chloride crystals is prone to a cycle of dissolution and crystallization, which leads to the formation of "crystal bridges" between crystals and causes agglomeration problems, which brings significant inconvenience to the use of fertilizers. Therefore, many fertilizer manufacturers have conducted in-depth research and discussion on the mechanism and causes of granular fertilizer agglomeration, and have adopted a variety of anti-caking strategies to reduce the agglomeration of fertilizers and ensure the fluidity of granular fertilizers. These strategies include but are not limited to adding anti-caking agents, adjusting fertilizer formulas, controlling storage environments, etc., among which adding anti-caking agents is one of the most widely used measures. In view of this, the demand for high-efficiency anti-caking agents that can effectively prevent agglomeration during long-term storage of ammonium chloride is extremely urgent. Summary of the invention

[0003] The present invention aims to provide an ammonium chloride anti-caking agent that is low in cost, easy to use and has a long-lasting anti-caking effect, so as to effectively improve the efficiency and quality of agricultural production. The inventor has conducted in-depth research and explored the mechanism and cause of ammonium chloride agglomeration. Through a large number of experiments and studies, an ammonium chloride anti-caking agent that can ensure the loose state of granular fertilizers is revealed; its main components include potassium salt of fatty alcohol ether phosphate ester and water-soluble high molecular polymer, and a preservative is added to ensure that the anti-caking agent is not easy to deteriorate during storage.

[0004] The water-soluble high molecular polymer is one or a mixture of two or more of polymethacrylate sodium salt or potassium salt, polyacrylic acid sodium salt or potassium salt, hydrolyzed polymaleic acid sodium salt or potassium salt, polyaspartic acid sodium salt or potassium salt. Such water-soluble high molecular polymers are all universal water treatment materials. A large number of carboxyl groups, sodium salts and potassium salts are distributed on the long chain of polymer molecules, which helps the dissolution of the polymer, ensures the stability and uniformity of the anti-caking agent, and is easier to mix evenly during use.

[0005] The water-soluble high molecular weight polymer has an average relative molecular weight of 2000 to 10000. Such low molecular weight water-soluble high molecular weight polymers are all anionic polymer electrolytes with a wide range of applications. They exhibit excellent water solubility and dispersibility, and can exert excellent adsorption functions by virtue of their unique anchoring groups and solvation chains, and effectively adsorb on the surface of ammonium chloride microcrystals. When wrapping ammonium chloride particles, a tight double electrical layer structure can be formed, so that a lasting repulsive force is generated between the grains, making it difficult to form a crystal bridge, thereby preventing the grains from contacting and growing with each other, and ultimately achieving the purpose of preventing agglomeration.

[0006] Potassium salt of fatty alcohol ether phosphate significantly reduces the surface tension of the anti-caking agent aqueous solution, thereby enhancing its diffusivity and permeability. This property enables the anti-caking agent aqueous solution to quickly diffuse and penetrate into the gaps between particles when it comes into contact with ammonium chloride particles, promoting the uniform formation of liquid film on the surface of the grains, increasing the coverage of the grain surface, and effectively reducing the probability of agglomeration. Comprehensive and sufficient coverage ensures that each particle is adequately protected, thereby avoiding the occurrence of agglomeration.

[0007] The preservative mentioned is benzisothiazolinone or methylisothiazolinone, or a mixture of the two. Isothiazolinone compounds have the advantages of significant antibacterial properties, low-dose application, good compatibility and low toxicity. In addition, this type of compound exhibits strong antibacterial activity against a variety of bacteria and fungi, has high bactericidal ability, good compatibility, a wide pH range, and can achieve natural biodegradation.

[0008] The anti-caking agent of the present invention is in the form of an aqueous solution.

[0009] The method of using the anti-caking agent is as follows: dilute the anti-caking agent with water to form a 2% to 3.0% (mass fraction) solution, use an atomizing device to evenly atomize it, and then spray it into the granulation process of the finished ammonium chloride product. The amount of anti-caking agent added to ammonium chloride depends on the size of the ammonium chloride particles and the storage environment. If the fertilizer particles are large and the particle size is uniform, the amount added is small; conversely, if the crystal particles are fine or the particle size is uneven, the amount added is large. In addition, if the storage conditions are good (such as storage in a warehouse), the amount added can be reduced; if the storage conditions are poor (such as open-air storage), the amount added can be increased. Generally speaking, the weight ratio of the added anti-caking agent to the weight of ammonium chloride is 30 to 150×10 -6 (mass fraction).

[0010] In the formula of CN105294313B, 90% to 97% of inorganic powder and 3% to 10% of surfactant are used. This formula uses inert powder to block the formation of crystal bridges between fertilizer particles and uses surfactants to achieve synergy. Although this method has a certain anti-caking effect, its process is relatively complex and the amount used is large, resulting in high costs and increasing the dust content of the fertilizer.

[0011] In the CN101798248B formula, bis(hexafluorononyl) succinate monoester amine salt is used as the main ingredient, and is supplemented with an appropriate proportion of primary amine salt or secondary amine salt and industrial wax oil for compounding. Although this formula has a certain anti-caking effect, its production and use process is relatively complicated, the required amount is large, and the cost is high. In addition, the mineral oil component in the formula will enter the soil with the fertilizer and is difficult to degrade.

[0012] In the formula of CN102786358B, a composite component including water-soluble polymer (10-50%), surfactant (5-20%), low-carbon alcohol (10-20%) and water (10-75%) is used. Although the formula shows a significant anti-caking effect, the low-carbon alcohol is flammable during the production process, which brings potential safety risks and causes a certain degree of environmental pollution.

[0013] The anti-caking agent of the present invention has the following advantages: (1) Fatty alcohol ether phosphate potassium salt and water-soluble high molecular polymer, while playing a certain anti-caking role, also have a surface active function, increasing the diffusion and penetration of the anti-caking agent solution.

[0014] (2) When using, dilute with water and then spray it into atomizer, which is easy to operate and environmentally friendly.

[0015] (3) The amount of anti-caking agent added is small, and the mass fraction of anti-caking agent added is only 30 to 150 × 10 -6 , low cost of use.

[0016] (4) It has good anti-caking effect and has good effect in high temperature and high humidity environments. DETAILED DESCRIPTION

[0017] In order to explain the various effective components of the present invention in detail, the present invention is further described in detail below in conjunction with specific embodiments. Example 1

[0018] Take 3.5 kg of potassium salt of fatty alcohol ether phosphate, 16.5 kg of sodium polyacrylate with an average relative molecular mass of 3000, 10.0 kg of hydrolyzed potassium polymaleate with an average relative molecular mass of 8000, add 70 kg of water, add 0.5 g of benzisothiazolinone, pour into a mixing tank and mix evenly to obtain ammonium chloride anti-caking agent 1. Example 2

[0019] Take 4.0 kg of potassium salt of fatty alcohol ether phosphate, 20.0 kg of potassium polymethacrylate with an average relative molecular mass of 6000, 6.0 kg of hydrolyzed potassium polymaleate with an average relative molecular mass of 5000, add 70 kg of water, add 0.7 g of methylisothiazolinone, pour into a mixing tank and mix evenly to obtain ammonium chloride anti-caking agent 2. Example 3

[0020] Take 4.5 kg of potassium salt of fatty alcohol ether phosphate, 25.5 kg of potassium polyacrylate with an average relative molecular mass of 4000, add 70 kg of water, add 0.5 g of benzisothiazolinone and 0.5 g of methylisothiazolinone, pour into a mixing tank and mix evenly to obtain ammonium chloride anti-caking agent 3.

[0021] Example 4 Anti-caking agent test The ammonium chloride anti-caking agents 1 to 3 obtained in the above Examples 1 to 3 were diluted 15 times with water to an effective concentration of 2% (mass fraction), atomized with a sprayer, and sprayed on ammonium chloride after atomization. The premixed sample was prepared by the preparation method of the premixed sample according to the appendix of "GB / T 33425-2016 Evaluation Method for Anti-caking Performance of Anti-caking Agents in Chemical Products". The anti-caking rate of the sample was measured by referring to the determination method of the anti-caking rate in Section 3.4 of the standard. The test results are shown in Table 1.

[0022]

[0023] The test results show that the difference between the ammonium chloride to which the anti-caking agent of the present invention is added and the ammonium chloride without the anti-caking agent is obvious after storage in a high pressure, temperature and humidity environment. The ammonium chloride anti-caking agent prepared by the present invention is an anti-caking agent with small dosage, low cost, good performance, high efficiency, easy use and no pollution.

[0024] The protection scope of the present invention is not limited to the above embodiments. Any person skilled in the art can easily change or replace the components after the present invention is disclosed, and these should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection atmosphere of the claims.

Claims

1. An ammonium chloride anti-caking agent, characterized in that: The anti-caking agent comprises potassium salt of fatty alcohol ether phosphate, water-soluble high molecular polymer, water and preservative, and the weight ratio of the two is 3-5:25-27:70:0.0005-0.

001.

2. An ammonium chloride anti-caking agent as claimed in claim 1, characterized in that: The water-soluble high molecular polymer is one or a mixture of two or more of polymethacrylate sodium salt or potassium salt, polyacrylic acid sodium salt or potassium salt, hydrolyzed polymaleic acid sodium salt or potassium salt, and polyaspartic acid sodium salt or potassium salt.

3. An ammonium chloride anti-caking agent as claimed in claim 1, characterized in that, The water-soluble high molecular weight polymer has an average relative molecular mass of 2000 to 10000.

4. An ammonium chloride anti-caking agent as claimed in claim 1, characterized in that, The preservative is one of benzisothiazolinone and methylisothiazolinone or a mixture thereof.

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