NL1043427B1 - Method of preparation of a water-soluble fertilizer coating, and application thereof - Google Patents

Abstract

The invention concerns the application and preparation of a water-soluble anti-caking agent for compound fertilizer, comprising of 20-25% natural surfactant, 5-10% watersoluble polymer, 0.5-1% defoamer and 64-74.5% water, at a total amount of 100% (m/m).

Description

ref: P 2019 NL 023 TITLE: Method of preparation of a water-soluble fertilizer coating, and application thereof Field of the Invention The invention relates to a water-soluble liquid anti-caking agent for compound fertilizer and its preparation methods, and belongs to the field of fertilizer processing technology. Background Art Compound fertilizer integrates various nutrients and plays an important role in fertilizer industry. In the course of transportation and storage of compound fertilizer, moisture exchange occurs between compound fertilizers and the environment, and salt in fertilizers is dissolved and recrystallized, resulting in salt bridge and hardening. The caking brings great inconvenience to the storage, transportation and use of fertilizer. To avoid the caking of compound fertilizer, the most effective method is to apply anti-caking agent to improve the surface properties of fertilizer particles.

At present, the anti-caking agent used by the compound fertilizer manufacturer is mainly oil-powder mixing anti-caking agent, the oil is mineral oil, animal and vegetable oil and so on, and the powder is kaolin, silica, talcum powder and so on. The principle is to block the caking of compound fertilizer by mechanical blocking.

Although it has anti-caking effect, but because of the high melting point of anti-caking oil, this kind of anti-caking agent needs to be heated and melted, which increases the cost. In addition, the mineral oil used is difficult to degrade, causing secondary pollution to the environment. Therefore, it is necessary to research and develop an anti-caking agent which is water-soluble, liquid and pollution-free.

Summary of the Invention The objective of the invention is to provide a water-soluble liquid anti-caking agent for compound fertilizer and its preparation methods with simple processing, low cost and good anticaking effect. The anti-caking agent can be sprayed directly on the surface of the fertilizer without heating and melting in the course of use. The operation is simple and the dosage of the anti-caking agent is 1-3 kgAon fertilizer, which can effectively prevent the formation of inter-granular crystal bridge, prevent fertilizer caking and keep fertilizer loose during storage, thereby ensuring the quality of fertilizer.

Technical solution for reaching the objective of the invention is as follows: A water-soluble liquid anti-caking agent for compound fertilizer is characterized in that (each component is calculated by the mass percentage) it contains 20-25%

natural surfactant, 5-10% water-soluble polymer, 0.5-1% defoamer and 64-74 5% water, and the total amount of each component is 100%.

The water-soluble liquid anti-caking agent for compound fertilizer claimed is characterized in that the natural surfactant is a natural tea saponin extracted from 3 Camellia oleifera, and its tea saponin content is more than 90%.

The water-soluble liquid antt-caking agent for compound fertilizer claimed is characterized in that the water-soluble polymer is polyvinyl alcohol and its molecular weight is between 500-100000.

The water-soluble liquid anti-caking agent for compound fertilizer claimed is characterized in that the defoamer is diisooctyl maleate sulfonate with a content of more than 70%.

The water-soluble liquid anti-caking agent for compound fertilizer is prepared according to the following methods: Each component is calculated by the mass percentage. Add 64-74.5% water in stirrer, heat up and keep temperature at 85-75°C, slowly add 20-25 natural surfactant, stir for 1 hour until the natural surfactant is completely dissolved, then slowly add 5-10% water-soluble polymer and stir for 0.5 hours until it is completely dissolved, finally, add 0.5-1% defoamer and stir for 0.5 hours to obtain the liquid anti-caking agent for compound fertilizer.

Specific Mode of Execution Example 1: Add 840 g water to the reactor with stirring and heating device, open the heating device, control the water temperature at 65-75 °C; start stirring, add 250 g tea saponins, stir for 1 hour until tea saponins are completely dissolved; slowly add 100 g polyvinyl alcohol, stir for 0.5 hours until it is completely dissolved; finally add 10 g diisooctyl maleate sulfonate, and stir for 0.5 hours to obtain liquid anti-caking agent {abbreviated as water-soluble agent X1) for compound fertilizer.

Take water-soluble agent X1, the liquid anti-caking agent (abbreviated as U.S.

water-soluble agent) of a company in the United States, the liquid anti-caking agent (abbreviated as European water-soluble agent) of a company in European for anti- caking experiment on 21-16-13 model nitro compound fertilizer produced by YARA. The dosages of all anti-caking agents are 1.2 kg per ton of fertilizer. Place fertilizer with anti-caking agent in a constant temperature and humidity chamber, and measure its looseness after placing for 24 hours. The resulis of the experiment are as follows: Type and dosage of | U.S. water- European Water-soluble CE | Blank water-soluble | anti-caking agent | soluble agent agent X1 agent | Dosage (kg/t) | © 1.2 1.2 | 1.2 Looseness (%) | 45 78 75 80

According to the above resulis, nitro compound fertilizer using water-soluble agent X1 has a higher degree of looseness after being placed in a high temperature and humidity environment for 24 hours, therefore, water-soluble agent X1 has a good anti~caking effect.

Example 2: Add 680 g water to the reactor with stirring and heating device, open the heating device, control the water temperature at 65-75 °C; start stirring, add 230 g tea saponins, stir for 1 hour until tea saponins are completely dissolved; slowly add 82 g polyvinyl alcohol, stir for 0.5 hours until it is completely dissolved; finally add 8 g diisooctyl maleate sulfonate, and stir for 0.5 hours to obtain liquid anti-caking agent {abbreviated as water-soluble agent X2} for compound fertilizer. Take water-soluble agent X2, the liquid anti-caking agent {abbreviated as U.S. water-soluble agent) of a company in the United States, the liquid anti-caking agent (abbreviated as European water-soluble agent) of a company in European for anti- caking experiment on compound fertilizer produced by a rotor drum granulator. The dosages of all anti-caking agents are 1.9 kg per ton of fertilizer. Place fertilizer with anti-caking agent in a constant temperature and humidity chamber, and measure its looseness after placing for 24 hours. The results of the experiment are as follows: Type and dosage of U.S. water- | European | Water-soluble | Í Blank water-soluble | anti-caking agent soluble agent | agent X2 | agent | Dosage (kg! t) 0 | 1.9 | 1.9 1.9 Looseness (%) 43 | 85 | 83 90 According to the above results, compound fertilizer (produced by a rotor drum granulator) using water-soluble agent X2 has a higher degree of looseness after being placed in a high temperature and humidity environment for 24 hours, therefore, water-soluble agent X2 has a good anti-caking effect.

Example 3: Add 740 g water to the reactor with stirring and heating device, open the heating device, control the water temperature at 65-75 °C; start stirring, add 200 g tea saponins, stir for 1 hour until tea saponins are completely dissolved; slowly add 55 g polyvinyl alcohol, stir for 0.5 hours until if is completely dissolved; finally add diisooctyl maleate sulfonate, and stir for 0.5 hours to obtain liquid anti-caking agent {abbreviated as water-soluble agent X3) for compound fertilizer. Take water-soluble agent X3, the liquid anti-caking agent {abbreviated as U.S. water-soluble agent) of a company in the United States, the liquid anti-caking agent {abbreviated as European water-soluble agent) of a company in European for anti- caking experiment on compound fertilizer produced by a rotor drum granulator. The dosages of all anti-caking agents are 3 kg per ton of fertilizer. Place fertilizer with anti-caking agent in a constant temperature and humidity chamber, and measure its looseness after placing for 24 hours. The results of the experiment are as follows:

Type and dosage of Blank U.S. water- | ae | Water-soluble | anti-caking agent soluble agent | agent X3 | | agent Dosage (kg/ 1) 0 3 | 3 3 Looseness (%) 41 90 | 87 94 According to the above results, compound fertilizer (produced by a rotor drum granulator) using water-soluble agent X3 has a higher degree of looseness after being placed in a high temperature and humidity environment for 24 hours, therefore, water-soluble agent X3 has a good anti-caking effect.

Claims (5)

CONCLUSIONS 1. A water-soluble anti-bake compound fertilizer, consisting of 20-25% natural surfactant, 5-10% water-soluble polymer, 0.5-1% anti-foam and 64-74.5% water, with a total amount of 100% (m/m). A water-soluble compound fertilizer anti-baking agent according to claim 1, wherein the natural surfactant is a natural tea saponin extract of Camellia oleifera, and the tea saponin content is greater than 90%. A water-soluble compound fertilizer anti-baking agent according to claim 1 or 2, wherein the water-soluble polymer is polyvinyl alcohol having a molecular weight between 500 and 100000 g/mol. A water-soluble compound fertilizer anti-baking agent according to any one of claims 1 to 3, wherein the anti-foam is diisoocty! maleate is sulfonate with an active content of more than 70% (w/w). A water-soluble compound fertilizer anti-baking agent according to any one of claims 1-4, wherein it is produced by heating water to 65-75°C, after which the natural surfactant is added slowly and stirred into the surfactant is completely dissolved, The water-soluble polymer is added slowly and stirred until the polymer is completely dissolved. Finally, the antifoam is added and stirred for half an hour.