Water-retaining high-molecular slow-release nitrogen-potassium fertilizer and preparation method thereof

A high-molecular, water-retaining technology, applied in fertilization devices, fertilizer mixtures, applications, etc., can solve the problems of backwardness in the research field of water-retaining slow-release fertilizers, achieve excellent nutrient slow and controlled release performance, raw materials are cheap and easy to obtain, and reduce cost effect

Active Publication Date: 2015-12-23
ZHONGBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention provides a water-retaining polymer slow-release nitrogen and potassium fertilizer in order to solve the backward problem in the field of water-retaining slow-release fertilizer technology research at home and abroad, which is a macromolecular polymer with a network structure. The macromolecular chain contains a large number of water-absorbing groups -COOH and -NH 2 , so it has excellent water absorption properties, and the polymer can release fertilizer nutrients through molecular chain breaks, and has good nutrient slow and controlled release properties

Method used

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  • Water-retaining high-molecular slow-release nitrogen-potassium fertilizer and preparation method thereof
  • Water-retaining high-molecular slow-release nitrogen-potassium fertilizer and preparation method thereof
  • Water-retaining high-molecular slow-release nitrogen-potassium fertilizer and preparation method thereof

Examples

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Effect test

Embodiment 1

[0029] A preparation method of water-retaining polymer slow-release nitrogen and potassium fertilizer, the steps of which are:

[0030] (1) Add potassium hydroxide solution and acrylic acid (the mass fraction of potassium hydroxide is 20%, and the molar ratio of potassium hydroxide and acrylic acid is 1:1) in the reaction vessel, and stir in an ice bath for 15 minutes until they are evenly mixed; then add The molar ratio of urea to acrylic acid is 1.8:1, stir for 20 minutes until the urea is completely dissolved; then add 0.5% of the mass of acrylic acid initiator potassium persulfate, and stir for 30 minutes until the potassium persulfate is completely dissolved; then add 0.02% of the mass of acrylic acid % cross-linking agent N,N'-methylenebisacrylamide, stir for 20 minutes until the cross-linking agent is completely dissolved, and continue stirring for 30 minutes until the solution is evenly mixed;

[0031] (2) The uniformly mixed solution is sealed, reacted at 75° C. for 2...

Embodiment 2

[0033] A preparation method of water-retaining polymer slow-release nitrogen and potassium fertilizer, the steps of which are:

[0034] (1) Add potassium hydroxide solution and acrylic acid (the mass fraction of potassium hydroxide is 20%, and the molar ratio of potassium hydroxide and acrylic acid is 0.85:1) in the reaction vessel, and stir in an ice bath for 30 minutes until they are evenly mixed; then add The molar ratio of urea to acrylic acid is 0.8:1, stir for 15 minutes until the urea is completely dissolved; then add 2.5% initiator potassium persulfate of the mass of acrylic acid, stir for 15 minutes until the potassium persulfate is completely dissolved; add 0.01% of the mass of acrylic acid % cross-linking agent N,N'-methylenebisacrylamide, stir for 20 minutes until the cross-linking agent is completely dissolved, and continue stirring for 30 minutes until the solution is evenly mixed;

[0035] (2) The uniformly mixed solution is sealed, reacted at 45°C for 4 hours, ...

Embodiment 3

[0037] A preparation method of water-retaining polymer slow-release nitrogen and potassium fertilizer, the steps of which are:

[0038] (1) Add potassium hydroxide solution and acrylic acid (the mass fraction of potassium hydroxide is 20%, and the molar ratio of potassium hydroxide and acrylic acid is 0.95:1) in the reaction vessel, stir in the ice bath for 20min until the mixture is uniform; then add The molar ratio of urea to acrylic acid is 1:1, stir for 20 minutes until the urea is completely dissolved; then add 2.5% initiator potassium persulfate of the mass of acrylic acid, stir for 20 minutes until the potassium persulfate is completely dissolved; add 0.01% of the mass of acrylic acid % cross-linking agent N,N'-methylenebisacrylamide, stir for 15 minutes until the cross-linking agent is completely dissolved, continue stirring for 30 minutes, until the solution is evenly mixed;

[0039] (2) The uniformly mixed solution is sealed, reacted at 45° C. for 4 hours, granulated...

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Abstract

The invention relates to the field of water-retaining slow/controlled-release fertilizers, specifically to a water-retaining high-molecular slow-release nitrogen-potassium fertilizer and its preparation method. The preparation method comprises the following steps: (1) adding a potassium hydroxide solution and acrylic acid into a reaction vessel, and stirring in an ice bath until the reactants are mixed uniformly; then adding urea and stirring until urea is completely dissolved; adding an initiator potassium persulphate, stirring until potassium persulphate is completely dissolved; and adding a cross-linking agent N,N'-methylene bisacrylamide, stirring until the cross-linking agent is completely dissolved, and continuously stirring for 30 min until the solution is mixed uniformly; and (2) sealing the uniformly-mixed solution, reacting at 25-75 DEG C for 2-6.5 h, granulating, and drying so as to obtain the water-retaining high-molecular slow-release nitrogen-potassium fertilizer. The preparation method is a solution polymerization method. The technology is simple and easy to operate. The prepared water-retaining high-molecular slow-release nitrogen-potassium fertilizer is a chemically synthesized water-retaining slow-release fertilizer and can make up the defect of a film-coated water-retaining slow-release fertilizer that nutrient release is limited by a coated material and a technology is complex.

Description

technical field [0001] The invention relates to the field of water-retaining slow / controlled release fertilizers, in particular to a water-retaining polymer slow-release nitrogen and potassium fertilizer and a preparation method thereof. Background technique [0002] Agriculture is the foundation of the national economy. my country is a large agricultural country. The waste of resources caused by low fertilizer utilization, environmental pollution and drought and water shortage are the two main factors restricting the development of my country's agriculture. In recent years, in order to promote the integration of water and fertilizer and improve the production efficiency of water and fertilizer, the water-retaining function of water-retaining agent, slow-release technology and fertilizer are integrated, and the research and development of water-retaining slow / controlled release fertilizer is the domestic and foreign research and development of solving practical production pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/06C05G3/08C05G3/70C05G3/90
Inventor 刘亚青李琦琛程冬冬向阳赵贵哲
Owner ZHONGBEI UNIV
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