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Preparation method of high-molecular water-absorbent resin nitrogen-potassium water retention controlled release fertilizer

A polymer water absorption and resin technology, applied in fertilization devices, fertilizer mixtures, applications, etc., can solve the problem of not having the function of water absorption and water retention, and achieve the effect of solving soil hazards, ensuring drought resistance, and promoting survival.

Inactive Publication Date: 2014-10-29
QINGDAO XINYAODI AGRI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current conventional fertilizers and slow-release and controlled-release fertilizers do not have the function of water absorption and water retention. In order to further promote the integrated interaction of fertilizer and water and improve the production efficiency of water and fertilizer, the water retention function of water-retaining agents, controlled release technology and fertilizer technology are combined. Among them, the research and development of water-retaining and controlled-release fertilizers is a practical production problem that needs to be solved urgently, and it is also a need for the theory and practice of water-fertilizer interaction and coupling.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The preparation method of the polymer water-absorbing resin nitrogen and potassium water-retaining controlled-release fertilizer in this embodiment includes the following contents: (1) preparing 1070 g of 31.5% NaOH aqueous solution;

[0028] (2) Neutralization reaction: Continuously drop the prepared NaOH aqueous solution into 2000g of acrylic acid with a purity greater than 99.5% for neutralization reaction. The reaction time is 20 minutes. Add 1230g (nitrogen content ≥ 46%) urea, 1182g ( Potassium oxide content ≥ 50%) potassium sulfate; then cool down to 56-65°C;

[0029] (3) Copolymerization reaction: Add 3g of methylene acrylamide crosslinking agent to the solution after neutralization reaction, stir at 90-100 rpm, add 9g of potassium persulfate initiator after 10 minutes, and heat to 65 The copolymerization reaction is carried out at -70°C, the temperature during the reaction is controlled at 110°C-115°C, and the reaction time is 15 minutes;

[0030] (4) Coagula...

Embodiment 2

[0036] The preparation method of the macromolecule water-absorbing resin nitrogen potassium water-retaining controlled-release fertilizer of the present embodiment includes the following contents:

[0037] (1) Prepare 1071g of 30.5% NaOH aqueous solution;

[0038] (2) Neutralization reaction: Continuously drop the prepared NaOH aqueous solution into 2000g of acrylic acid with a purity greater than 99.5% for neutralization reaction. The reaction time is 20 minutes. Add 1230g (nitrogen content ≥ 46%) urea, 1130g ( Potassium oxide content ≥ 50%) potassium sulfate; then cool down to 56-65°C;

[0039] (3) Copolymerization reaction: Add 5g of methylene acrylamide crosslinking agent to the solution after neutralization reaction, stir at 90-100 rpm, add 3g of potassium persulfate initiator after 10 minutes, and heat to 65 The copolymerization reaction is carried out at -70°C, the temperature during the reaction is controlled at 110°C-115°C, and the reaction time is 15 minutes;

[0...

Embodiment 3

[0046] The preparation method of the macromolecule water-absorbing resin nitrogen potassium water-retaining controlled-release fertilizer of the present embodiment includes the following contents:

[0047] (1) Prepare 1075g of 32.% NaOH aqueous solution;

[0048] (2) Neutralization reaction: Continuously drop the prepared NaOH aqueous solution into 2000g of acrylic acid with a purity greater than 99.5% for neutralization reaction. The reaction time is 20 minutes. Add 1250g (nitrogen content ≥ 46%) urea, 1172g ( Potassium oxide content ≥ 50%) potassium sulfate; then cool down to 56-65°C;

[0049] (3) Copolymerization reaction: Add 7g of methylene acrylamide crosslinking agent to the solution after neutralization reaction, stir at 90-100 rpm, add 5g of potassium persulfate initiator after 10 minutes, and heat to 65 The copolymerization reaction is carried out at -70°C, the temperature during the reaction is controlled at 110°C-115°C, and the reaction time is 15 minutes;

[00...

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Abstract

The invention provides a preparation method of a high-molecular water-absorbent resin nitrogen-potassium water retention controlled release fertilizer. The preparation method includes the steps of preparation of an aqueous solution of sodium hydroxide, a neutralization reaction, a copolymerization reaction, solidification drying, and crushing. The method shortens the process flow, reduces the production time and reduces the production cost. The method solves a problem of damages of heavy use of a traditional chemical fertilizer to soil, water and air, and also increases the content of nitrogen and potassium elements in the water retention fertilizer. The method has the advantages of no generation of three wastes (industrial residue, waste gas and waste water) in the production process, no pollution to the environment, safety, environmental protection, and stable product quality.

Description

technical field [0001] The invention relates to a preparation method of a polymer water-absorbing resin nitrogen and potassium water-retaining and controlled-release fertilizer, specifically belonging to a production process of a polymer water-absorbing resin (also known as (SAP) water-retaining agent). Background technique [0002] . The invention discloses a method for preparing a polymer water-absorbing resin nitrogen and potassium water-retaining and controlled-release fertilizer, through the production process of the polymer water-absorbing resin and the chemical modification method of the hydrophilic polymer, and the fertilizer nutrient group is bonded to the macromolecular skeleton structure On, so that it has both water absorption and water retention performance, and slow and controlled release performance. A new nitrogen and potassium water-retaining and controlled-release fertilizer material formed by polymerization of acrylic acid, sodium hydroxide, potassium sul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/06C08F220/54C05G3/04C05G3/80
Inventor 朱彦芳
Owner QINGDAO XINYAODI AGRI TECH CO LTD
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