Synergistic slow-release coated fertilizer and preparation method thereof

A technology of slow-release package and coating material, which is applied in the direction of layered/coated fertilizer, organic fertilizer, ammonium salt fertilizer, etc., can solve the problems of not easy to degrade, pollute the soil, etc., and achieve the effect of increasing the percentage and increasing the content.

Inactive Publication Date: 2019-04-05
河北百禾丰化肥有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem that the nitrogen content in the coating agent is too low and it is not easy to degrade, the present invention provides a method for preparing a synergistic slow-release coated fertilizer. On the one hand, it can increase the nitrogen content in

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0027] Example 1

[0028] The present embodiment provides a synergistic slow-release coated fertilizer, which is prepared according to the following method:

[0029] ①Prepare the first coating material: Stir 1.8kg of urea and 30% formaldehyde (4.6kg) solution in the reaction tank until the urea is completely dissolved, adjust the pH of the solution to 8~9 with triethanolamine, and react at room temperature for 1h , adjust the pH to between 5 and 6, heat to 60 to 65 ° C under stirring, continue to stir until the reaction system is close to the gel state, stop heating, and prepare the first coating material for later use.

[0030] ② Preparation of the second coating material: 2.82 kg of humic acid, 0.3 kg of potassium hydroxide and 1.5 kg of polynucleic acid powder were uniformly mixed in a ball mill to prepare a second coating material for later use.

[0031] ③Preheat the large urea masterbatch (100kg) with a particle size range of 2.0mm~5.0mm in the rotary drum to 60~65℃, sta...

Example Embodiment

[0033] Example 2

[0034] The present embodiment provides a synergistic slow-release coated fertilizer, which is prepared according to the following method:

[0035] ①Prepare the first coating material: stir 1.8kg of urea and 30% formaldehyde (6kg) solution in a reaction tank until the urea is completely dissolved, adjust the pH of the solution to 8~9 with triethanolamine, and react at room temperature for 2h, The pH is adjusted to be between 5 and 6, heated to 70 to 80° C. under stirring, and the stirring is continued until the reaction system is close to a gel state and the heating is stopped to prepare a first coating material for later use.

[0036] ② Preparation of the second coating material: 2.79kg of humic acid, 0.3kg of potassium hydroxide, 1.5kg of polynucleic acid powder, 0.3kg of zinc sulfate, borax and ferrous sulfate 1:1:1 mixture, in Mix uniformly in the ball mill to prepare the second coating material for later use.

[0037] ③ Preheat the large urea masterbat...

Example Embodiment

[0039] Example 3

[0040] The present embodiment provides a synergistic slow-release coated fertilizer, which is prepared according to the following method:

[0041] ①Prepare the first coating material: stir 1.8kg of urea and 30% formaldehyde (6kg) solution in a reaction tank until the urea is completely dissolved, adjust the pH of the solution to 8~9 with triethanolamine, and react at room temperature for 2h, The pH is adjusted to be between 5 and 6, heated to 70 to 80° C. under stirring, and the stirring is continued until the reaction system is close to a gel state and the heating is stopped to prepare a first coating material for later use.

[0042] ② Preparation of the second coating material: 2.76kg of humic acid, 0.3kg of potassium hydroxide, 1.5kg of polynucleic acid powder, 0.3kg of Bacillus subtilis, rhizobia inoculum and nitrogen-fixing bacteria 1:1:1 The mixture, 0.3kg of zinc sulfate, borax, manganese sulfate, ammonium molybdate, copper sulfate and bisulfite sulf...

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PUM

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Abstract

The invention relates to a preparation method of synergistic slow-release coated fertilizer. The preparation method comprises the following steps of S1, preparation of a first coating material: agitating urea and a 20% to 40% of formaldehyde solution in a reaction tank until the urea is completely dissolved, regulating the pH of a solution to 8 to 9 by using triethanolamine, reacting for 1h to 2hat a normal temperature, regulating the pH to be between 5 to 6.5, heating to 60 DEG C to 80 DEG C while agitating, continuously agitating, and stopping heating until a reaction system approaches a gel state, so as to obtain the first coating material; S2, preparation of a second coating material: uniformly mixing 70% to 99% of humic acid, 0.5% to 1% of activator and 0.5% to 29% of polynucleic acid powder according to percentage by weight, so as to obtain the second coating material; S3, raising the temperature of a urea master batch with a particle size range of 2.0mm to 5.0mm to 60 DEG C to80 DEG C in a revolving drum, spraying the first coating material to the surface of the urea master batch through a sprinkling device, and aeration-drying, so as to complete a first layer of coating;and S4, preheating fertilizer completed in the first layer of coating, preheating to 40 DEG C to 50 DEG C, spray-coating an adhesive (dissolving alginic acid in an alkaline solution) to the surface offluidized fertilizer, and then dispersing the second coating material on the surface of the fertilizer, so as to obtain the synergistic slow-release coated fertilizer.

Description

technical field [0001] The invention relates to the technical field of fertilizers, in particular to a synergistic slow-release coated fertilizer and a preparation method thereof. Background technique [0002] At present, with the development of agriculture, fertilizers are getting more and more attention. In order to improve the utilization rate of fertilizers and reduce or avoid the environmental pollution caused by the loss of fertilizers, there are many methods and approaches. Among them, modifying the fertilizer itself and developing slow-release and controlled-release fertilizers are the most rapid and convenient, and the most fundamental solution Hot spot for fertilizer loss problem. The current development of coated slow-release fertilizers mainly focuses on the selection of coating materials. At present, the most commonly used coating agents are sulfur coating and resin coating. Both technologies have deficiencies: (1) The nitrogen content in the sulfur coating i...

Claims

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Application Information

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IPC IPC(8): C05G3/00C05G3/04C05G3/08C05G3/80C05G3/90
CPCC05C3/00C05C9/00C05G3/00C05G3/90C05G5/30C05G3/80C05F11/02C05D9/02
Inventor 宋天月王福生董晓伟苏永群
Owner 河北百禾丰化肥有限公司
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