Phosphate fertilizer controllably released through pH-sensitive material and preparation method of phosphate fertilizer

Abstract

The invention provides a phosphate fertilizer controllably released through a pH-sensitive material. The phosphate fertilizer is characterized by being prepared by coating a water-soluble phosphate fertilizer with the pH-sensitive material, wherein the pH-sensitive material is prepared by crosslinking wheat gluten and zeolite under the action of a crosslinking agent; after a crop is lack of phosphorus, the pH value of the periphery of the root system is reduced because organic acid secreted by the root system of the crop is increased, and the wheat gluten embedded in pores of the zeolite is pored through soluble inflation and hydrolysis under the condition of low pH value, so that a controlled release effect is achieved; and at the moment, water-soluble phosphorus cannot be fixed by soil due to the existence of organic acid, so that the efficient absorption of the crop on phosphorus is increased to the maximum extent, and the fixed and lost phosphorus is reduced. By using the phosphate fertilizer controllably released through the pH-sensitive material, the problems that the absorption and utilization rates of crops on phosphorus are low and phosphorus is easily fixed and lost because phosphorus in the existing controlled-release phosphate fertilizer cannot be controllably released according to the growth demands of the crops are solved.

Description

technical field

[0001] The invention relates to the field of controlled-release phosphate fertilizers, in particular to a phosphate fertilizer controlled by pH-sensitive materials. Background technique

[0002] Phosphorus is one of the essential nutrients for the growth of crops. The whole growth cycle of crops has a certain demand for phosphorus. However, after phosphorus fertilizer is applied to the soil, only a small amount can be absorbed and utilized by crops, and most of it will be fixed by the soil and become invalid. , resulting in loss of phosphate fertilizer. Therefore, the development and application of slow-release phosphate fertilizers is of great significance to modern agriculture.

[0003] At present, the main ways to solve the slow release of phosphate fertilizer and improve the utilization rate are coated phosphate fertilizer and citrate soluble phosphate fertilizer. Coated phosphate fertilizer is mainly to wrap a layer of film on the surface of phosphate...

Examples

Embodiment 1

[0035] (1) Mix the acid-hydrolyzed organically modified zeolite powder and corn gluten powder in a mass ratio of 20:1 in a vortex air refiner and refine them until the particle size is less than 10 microns, and completely embed the gluten powder in the modified In the pores of zeolite;

[0036] (2) Add the mixed fine material obtained in step (1) into a reactor with a stirring device, weigh the crosslinking agent according to the mass ratio of gluten powder and crosslinking agent zinc acetate to 1:0.02, and add it to the reactor , add an appropriate amount of water at the same time, the amount of water is subject to the formation of a slurry, stir and react at a constant temperature of 80-120°C for 0.5h, and form a paste-like pH-sensitive material after the cross-linking reaction is completed;

[0037](3) Put 85 parts by weight of ammonium dihydrogen phosphate and ammonium polyphosphate in the disc granulation equipment, set the temperature at 70°C, pass 3 parts by weight of t...

Embodiment 2

[0040] (1) The zeolite powder organically modified by acid hydrolysis and the straw gluten powder are mixed and refined in a vortex airflow refiner at a mass ratio of 22:1 to a particle size of less than 10 microns, and the gluten powder is completely embedded in the modified In the pores of zeolite;

[0041] (2) Add the mixed fine material obtained in step (1) into a reactor with a stirring device, weigh the crosslinking agent according to the mass ratio of gluten powder and crosslinking agent magnesium acetate of 1:0.03, and add it to the reactor , add an appropriate amount of water at the same time, the amount of water is subject to the formation of a slurry, stir and react at a constant temperature of 80-120 ° C for 1 hour, and form a paste-like pH-sensitive material after the cross-linking reaction is completed;

[0042] (3) Put 90 parts by weight of potassium dihydrogen phosphate and urea polyphosphate fertilizer in the disc granulation equipment, set the temperature at ...

Embodiment 3

[0045] (1) Mix the acid-hydrolyzed organically modified zeolite powder and cassava gluten powder in a mass ratio of 25:1 in a vortex airflow refiner and refine them until the particle size is less than 10 microns, and completely embed the gluten powder in the modified In the pores of zeolite;

[0046] (2) Add the mixed fine material obtained in step (1) into a reactor with a stirring device, weigh the crosslinking agent according to the mass ratio of gluten powder and crosslinking agent calcium acetate of 1:0.05, and add it to the reactor , add an appropriate amount of water at the same time, the amount of water is subject to the formation of a slurry, stir and react at a constant temperature of 80-120°C for 0.8h, and form a paste-like pH-sensitive material after the cross-linking reaction is completed;

[0047] (3) Put 88 parts by weight of ammonium polyphosphate and urea polyphosphate phosphate fertilizer in the disc granulation equipment, set the temperature at 70°C, pass 4...

technical field

[0001] The invention relates to the field of controlled-release phosphate fertilizers, in particular to a phosphate fertilizer controlled by pH-sensitive materials. Background technique

[0002] Phosphorus is one of the essential nutrients for the growth of crops. The whole growth cycle of crops has a certain demand for phosphorus. However, after phosphorus fertilizer is applied to the soil, only a small amount can be absorbed and utilized by crops, and most of it will be fixed by the soil and become invalid. , resulting in loss of phosphate fertilizer. Therefore, the development and application of slow-release phosphate fertilizers is of great significance to modern agriculture.

[0003] At present, the main ways to solve the slow release of phosphate fertilizer and improve the utilization rate are coated phosphate fertilizer and citrate soluble phosphate fertilizer. Coated phosphate fertilizer is mainly to wrap a layer of film on the surface of phosphate...

Examples

Embodiment 1

[0035] (1) Mix the acid-hydrolyzed organically modified zeolite powder and corn gluten powder in a mass ratio of 20:1 in a vortex air refiner and refine them until the particle size is less than 10 microns, and completely embed the gluten powder in the modified In the pores of zeolite;

[0036] (2) Add the mixed fine material obtained in step (1) into a reactor with a stirring device, weigh the crosslinking agent according to the mass ratio of gluten powder and crosslinking agent zinc acetate to 1:0.02, and add it to the reactor , add an appropriate amount of water at the same time, the amount of water is subject to the formation of a slurry, stir and react at a constant temperature of 80-120°C for 0.5h, and form a paste-like pH-sensitive material after the cross-linking reaction is completed;

[0037](3) Put 85 parts by weight of ammonium dihydrogen phosphate and ammonium polyphosphate in the disc granulation equipment, set the temperature at 70°C, pass 3 parts by weight of t...

Embodiment 2

[0040] (1) The zeolite powder organically modified by acid hydrolysis and the straw gluten powder are mixed and refined in a vortex airflow refiner at a mass ratio of 22:1 to a particle size of less than 10 microns, and the gluten powder is completely embedded in the modified In the pores of zeolite;

[0041] (2) Add the mixed fine material obtained in step (1) into a reactor with a stirring device, weigh the crosslinking agent according to the mass ratio of gluten powder and crosslinking agent magnesium acetate of 1:0.03, and add it to the reactor , add an appropriate amount of water at the same time, the amount of water is subject to the formation of a slurry, stir and react at a constant temperature of 80-120 ° C for 1 hour, and form a paste-like pH-sensitive material after the cross-linking reaction is completed;

[0042] (3) Put 90 parts by weight of potassium dihydrogen phosphate and urea polyphosphate fertilizer in the disc granulation equipment, set the temperature at ...

Embodiment 3

[0045] (1) Mix the acid-hydrolyzed organically modified zeolite powder and cassava gluten powder in a mass ratio of 25:1 in a vortex airflow refiner and refine them until the particle size is less than 10 microns, and completely embed the gluten powder in the modified In the pores of zeolite;

[0046] (2) Add the mixed fine material obtained in step (1) into a reactor with a stirring device, weigh the crosslinking agent according to the mass ratio of gluten powder and crosslinking agent calcium acetate of 1:0.05, and add it to the reactor , add an appropriate amount of water at the same time, the amount of water is subject to the formation of a slurry, stir and react at a constant temperature of 80-120°C for 0.8h, and form a paste-like pH-sensitive material after the cross-linking reaction is completed;

[0047] (3) Put 88 parts by weight of ammonium polyphosphate and urea polyphosphate phosphate fertilizer in the disc granulation equipment, set the temperature at 70°C, pass 4...