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Preparation method for high-molecular water-absorbent resin potassium-phosphate water-retaining controlled-release fertilizer

A technology of polymer water absorption and potassium phosphate, applied in fertilization devices, fertilizer mixtures, applications, etc., can solve the problems of not having the function of water absorption and water retention, and achieve the effect of preventing soil compaction

Active Publication Date: 2014-10-29
QINGDAO ZETIAN AGRI SCI & 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 slow-release 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

[0025] A kind of preparation method of polymer water-absorbing resin potassium phosphate water-retaining controlled-release fertilizer of the present embodiment comprises the following contents:

[0026] (1) Prepare 1560g of 31.5% NaOH aqueous solution;

[0027] (2) Neutralization reaction: Continuously drop the prepared NaOH aqueous solution into 3000g of acrylic acid with a purity greater than 99.5% for neutralization reaction. The reaction time is 20 minutes. Add 1520g (phosphoric acid content ≥ 86%) phosphoric acid, 2200g ( Potassium oxide content ≥ 50%) potassium sulfate; then cool down to 56-65°C;

[0028] (3) Copolymerization reaction: Add 80g of polyethylene glycol crosslinking agent to the solution after neutralization reaction, stir at 90-100 rpm, add 15g 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 ...

Embodiment 2

[0033]The preparation method of the polymer water-absorbing resin potassium phosphate water-retaining controlled-release fertilizer of the present embodiment includes the following contents:

[0034] (1) Prepare 1560g of 32.7% NaOH aqueous solution;

[0035] (2) Neutralization reaction: Continuously drop the prepared NaOH aqueous solution into 3000g of acrylic acid with a purity greater than 99.5% for neutralization reaction. The reaction time is 20 minutes. Add 1550g (phosphoric acid content ≥ 86%) phosphoric acid, 2160g ( Potassium oxide content ≥ 50%) potassium sulfate; then cool down to 56-65°C;

[0036] (3) Copolymerization reaction: Add 80g of polyethylene glycol crosslinking agent to the solution after neutralization reaction, stir at 90-100 rpm, add 15g 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 m...

Embodiment 3

[0041] A kind of preparation method of polymer water-absorbing resin potassium phosphate water-retaining controlled-release fertilizer of the present embodiment comprises the following contents:

[0042] (1) Prepare 1560g of 31.9% NaOH aqueous solution;

[0043] (2) Neutralization reaction: Continuously drip the prepared NaOH aqueous solution into 3000g of acrylic acid with a purity greater than 99.5% for neutralization reaction. The reaction time is 20 minutes. Add 1570g (phosphoric acid content ≥ 86%) phosphoric acid, 2170g ( Potassium oxide content ≥ 50%) potassium sulfate; then cool down to 56-65°C;

[0044] (3) Copolymerization reaction: Add 80g of polyethylene glycol crosslinking agent to the solution after neutralization reaction, stir at 90-100 rpm, add 15g 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 ...

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Abstract

A provided preparation method for a high-molecular water-absorbent resin potassium-phosphate water-retaining controlled-release fertilizer comprises: preparing an aqueous solution of sodium hydroxide, performing neutralization reaction, performing copolymerization, performing solidification and drying, and crushing. The technological flow is shortened, the production time is shortened, and the production cost is reduced. The problem of harm of conventional fertilizers used in large scale to soil, water sources and air, and also the content of phosphoric acid and potassium oxide in the water-retaining controlled-release fertilizer are increased. No three wastes (waste gas, waste water and industrial residue) are generated during production, no environmental pollution is generated, the preparation method is safe and environment-friendly, and the product is stable in quality.

Description

technical field [0001] The invention relates to a preparation method of a polymer water-absorbing resin potassium phosphate water-retaining controlled-release fertilizer, specifically belonging to the production process of a polymer water-absorbing resin, also known as SAP. Background technique [0002] The preparation method of the present invention is a polymer water-absorbing resin potassium phosphate water-retaining controlled-release fertilizer, which is to bond the fertilizer nutrient group to the macromolecular skeleton structure through the production process of the polymer water-absorbing resin and the chemical modification method of the hydrophilic polymer On, so that it has both water absorption and water retention performance, and slow and controlled release performance. Potassium phosphate water-retaining and controlled-release fertilizer new material formed by polymerization of acrylic acid, sodium hydroxide, potassium sulfate, phosphoric acid, polyethylene gly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/06C05G3/04C05G3/80
Inventor 朱彦芳
Owner QINGDAO ZETIAN AGRI SCI & TECH CO LTD