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Preparation method for isobutylidene diurea water-retention sustained-release fertilizer

A technology for isobutylidene diurea and slow-release fertilizers, applied in fertilizer mixtures, solid/semi-solid fertilizers, nitrogen fertilizers, etc.

Inactive Publication Date: 2016-12-21
HENAN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the research and application in this area started relatively late in my country, and it will take some time for its popularization and application (Zhi Zhang, Ying Zhang, Wenmin Wang, et al. Synthesis of isobutylidene diurea, Shandong Chemical Industry, 2005, 34:7- 8; Zou Jing, Research Status and Prospects of Environmentally Friendly Slow-release / Controlled-release Fertilizers, Journal of Wuhan Institute of Chemical Technology, 2003, 25(1): 13-17)

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Add 7.50 g of urea and 20.00 g of water into a 250 mL three-neck flask, stir mechanically and heat to 50°C to dissolve the urea. After cooling down to 30°C, add 7.50 g of acrylamide, adjust the pH of the solution to about 3 with hydrochloric acid, then add 2.60 g of cross-linking agent polyethylene glycol dimethacrylate, and 0.10 g of initiator ammonium persulfate, and stir to dissolve. Slowly raise the temperature, and add 4.3 g of isobutyraldehyde dropwise at the same time, react at 68° C. for 0.5 hour after dropping, dry, pulverize, and granulate to obtain isobutylidene diurea water-retaining slow-release fertilizer.

Embodiment 2

[0021] Add 7.50 g of urea and 20.00 g of water into a 250 mL three-neck flask, stir mechanically and heat to 50°C to dissolve the urea. After cooling down to 30°C, add 7.50 g of maleic acid, adjust the pH of the solution to about 3 with hydrochloric acid, then add 0.79 g of cross-linking agent polyethylene glycol dimethacrylate and 0.10 g of initiator ammonium persulfate, and stir to dissolve. Slowly raise the temperature, and add 4.3 g of isobutyraldehyde dropwise at the same time, react at 75° C. for 0.5 hour after dropping, dry, pulverize, and granulate to obtain isobutylidene diurea water-retaining slow-release fertilizer.

Embodiment 3

[0023] Add 7.50 g of urea and 30.00 g of water into a 250 mL three-neck flask, stir mechanically and heat to 50°C to dissolve the urea. After cooling down to 40°C, add 7.50 g of acrylamide, adjust the pH of the solution to about 3 with hydrochloric acid, then add 2.60 g of crosslinking agent N, N-methylenebisacrylamide, and 0.10 g of initiator potassium persulfate, and stir to dissolve. Slowly raise the temperature, and add 4.3 g of isobutyraldehyde dropwise at the same time, react at 60°C for 2 hours after dropping, dry, pulverize, and granulate to obtain isobutylidene diurea water-retaining slow-release fertilizer.

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Abstract

The invention belongs to the field of water-retention sustained / controlled-release fertilizers and particularly discloses a preparation method for an isobutylidene diurea water-retention sustained / controlled-release fertilizer. According to the preparation method, isobutylidene diurea with extensive application is produced through a reaction between isobutylaldehyde and urea, so that the utilization ratio of a nitrogen fertilizer is increased, and material wasting and environmental pollution are reduced. During the synthesis of isobutylidene diurea, hydrophilic monomers, a cross-linking agent and an initiator are simultaneously added, a hydrophilic polymer network is formed through heating-up polymerization, and the isobutylidene diurea water-retention sustained / controlled-release fertilizer is prepared by a one-pot method. The water-retention sustained / controlled-release fertilizer not only has good sustained-release performance, but also has certain water retention property, and the preparation method is simple and is wide in application prospect.

Description

technical field [0001] The invention belongs to the technical field of water-retaining and slow-release fertilizers, and in particular relates to the preparation of isobutylidene diurea water-retaining and slow-release fertilizers by a "one-pot method". Background technique [0002] Fertilizer is the largest material investment in agricultural production and an important guarantee for increasing agricultural production. According to statistics, in the 20th century, fertilizers contributed 40% to 60% to the increase in world grain production. In the process of fertilization, how to improve the utilization rate of fertilizers and reduce environmental pollution is an important subject for people to study, and it is also a key issue for the sustainable development of agriculture. Because slow and controlled release fertilizers can significantly increase the utilization rate of fertilizers, reduce the pollution of the environment caused by fertilization, and improve the yield an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00
CPCC05C9/00C05G3/00C05G5/12C05C9/02
Inventor 魏宏亮赵鹏楚晖娟朱靖王刚
Owner HENAN UNIVERSITY OF TECHNOLOGY
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