Water-soluble urea-formaldehyde glue and preparation method thereof as well as method for improving strength of water-soluble compound fertilizer granule by water-soluble urea-formaldehyde glue

A fertilizer granule, water-soluble technology, applied in the field of agricultural chemistry, can solve the problems of high loss of cooling oil, high capital investment in equipment, and high cost.

Active Publication Date: 2013-04-10
SICHUAN BESTLUCK CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

High-tower melting granulation requires special high-tower melting and granulation equipment, and the capital investment of the equipment is high, so only large-scale fertilizer manufacturers can use it; in addition, due to the limitation of equipment, the processing volume of each batch is large, so it is only suitable for Field fertilizer product

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0083] (1) Raw materials are prepared according to the following parts by weight: formaldehyde aqueous solution 680 with a concentration of 37wt%, urea 320, melamine 3, phthalic anhydride 3, sodium hydroxide aqueous solution 3 with a concentration of 30wt%, and tapioca starch 22;

[0084] (2) Add formaldehyde aqueous solution with a concentration of 37wt% into the reactor, adjust the temperature in the reactor to 25°C, and add sodium hydroxide solution to adjust the pH to 8.0-8.5;

[0085] (3) Melamine, tapioca starch with a total amount of 70wt% and urea with a total amount of 80wt% were added to the reactor, and the temperature in the reactor was raised to 50°C;

[0086] (4) Stop the temperature rise, and when the temperature rises to 90°C due to the exothermic reaction of the reactants, keep the heat for 40 minutes;

[0087] (5) Gradually add phthalic anhydride, adjust the pH to 5.0, and react for 20 minutes;

[0088] (6) Add sodium hydroxide solution to adjust the pH to 8...

Embodiment 2

[0093] (1) Raw materials are prepared according to the following parts by weight: formaldehyde solution 650 with a concentration of 37wt%, urea 300, melamine 2, phthalic anhydride 2, sodium hydroxide solution 2 with a concentration of 30wt%, and mung bean starch 20;

[0094] (2) Add formaldehyde aqueous solution with a concentration of 37wt% into the reactor, adjust the temperature inside the reactor to 22°C, and add sodium hydroxide solution to adjust the pH to 8.0-8.5;

[0095] (3) Melamine, mung bean starch with a total amount of 65wt% and urea with a total amount of 75wt% were added to the reactor, and the temperature in the reactor was raised to 45°C;

[0096] (4) Stop the temperature rise, and when the temperature rises to 85°C due to the exothermic reaction of the reactants, keep the temperature for 45 minutes;

[0097] (5) Gradually add phthalic anhydride, adjust the pH to 5.0, and react for 25 minutes;

[0098] (6) Add sodium hydroxide solution to adjust the pH to 8....

Embodiment 3

[0103] (1) Raw materials are prepared according to the following parts by weight: 750% formaldehyde solution with a concentration of 37wt%, 350% urea, 4 melamine, 4 phthalic anhydride, 4% aqueous sodium hydroxide solution with a concentration of 30wt%, and 25% corn starch;

[0104] (2) Add formaldehyde aqueous solution with a concentration of 37wt% into the reactor, adjust the temperature inside the reactor to 28°C, and add sodium hydroxide solution to adjust the pH to 8.0-8.5;

[0105] (3) Add melamine, cornstarch with a total amount of 75wt% and urea with a total amount of 85wt% into the reactor, and the temperature in the reactor is raised to 55°C;

[0106] (4) Stop the temperature rise, and when the temperature rises to 95°C due to the exothermic reaction of the reactants, keep the heat for 35 minutes;

[0107] (5) Gradually add phthalic anhydride, adjust the pH to 5.0, and react for 25 minutes;

[0108] (6) Add sodium hydroxide solution to adjust the pH to 8.0, lower the...

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PUM

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Abstract

The invention relates to water-soluble urea-formaldehyde glue and a preparation method thereof as well as a method for improving strength of water-soluble compound fertilizer granule by the water-soluble urea-formaldehyde glue. The water-soluble urea-formaldehyde glue consists of the following raw material components in parts by weight: 600-800 parts of 37wt% formaldehyde water soluble, 250-400 parts of urea, 1-5 parts of melamine, 1-5 parts of phthalic anhydride, 1-5 parts of sodium hydroxide solution and 15-30 parts of starch. The method for improving the strength of the water-soluble compound fertilizer granule by the water-soluble urea-formaldehyde glue comprises the following steps: in a process of preparing the water-soluble compound fertilizer by an aggregating process, after processes of pelleting, drying and sieving and before a cooling process, spraying the water-soluble urea-formaldehyde glue on the surface of the fertilizer granule. The water-soluble urea-formaldehyde glue disclosed by the invention is low in cost and simple in preparation method; and, after implementing a surface treatment on the water-soluble compound fertilizer granule, the strength of the fertilizer granule is remarkably improved to more than 20N under a precondition of guaranteeing a controlled-release effect, so that the water-soluble urea-formaldehyde glue can completely meet the demand of spouted bed coating.

Description

technical field [0001] The invention belongs to the technical field of agricultural chemistry, and relates to the manufacture of chemical fertilizers, in particular to a water-soluble urea-formaldehyde glue, a manufacturing method thereof and a method for improving particle strength of water-soluble compound fertilizers by using the same. Background technique [0002] Compound fertilizer is a general term for compound fertilizers and mixed fertilizers, which are processed by chemical and physical methods. Water-soluble fertilizer refers to a multi-component compound fertilizer that can be completely dissolved in water. It can be quickly dissolved in water, easily absorbed by crops, and has a relatively high absorption and utilization rate. More importantly, it can be applied to facility agriculture such as sprinkler irrigation. Realize the integration of water and fertilizer, which has the advantages of saving water, fertilizer and labor. Controlled-release fertilizers (slo...

Claims

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Application Information

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IPC IPC(8): C05G3/00C05G3/08C05G3/90
Inventor 周明贵徐秋明
Owner SICHUAN BESTLUCK CHEM
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