Grafting reaction-type water-retaining slow-release nitrogen, phosphorus and potassium fertilizer and preparation method thereof

A grafting reaction, slow-release nitrogen technology, applied in phosphate fertilizers, organic phosphate fertilizers, applications, etc., can solve the problems of high production cost of water-retaining slow-release fertilizers, poor nutrient slow-release performance, etc., and achieve good application prospects, low cost, The effect of good water retention

Inactive Publication Date: 2017-02-22
SHANDONG AGRICULTURAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problems of high production cost and poor nutrient slow-release performance of water-retaining slow-release fertilizers, the invention provides a graft-reaction type water-retaining slow-release nitrogen, phosphorus and potassium fertilizer and a preparation method thereof

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A kind of preparation method of graft reaction type water-retaining slow-release nitrogen, phosphorus and potassium fertilizer, its steps are:

[0036] (1) Add 1360 g of potassium dihydrogen phosphate solution with a mass fraction of 50% and 600 g of industrial urea into the reactor, stir and mix at room temperature until completely dissolved until the pH is 8 to 9 to obtain a potassium diurea phosphate solution for subsequent use.

[0037] (2) Add 58g of acrylic acid, 32g of sodium acrylate and 0.54g of N,N'-methylenebisacrylamide to the empty reactor at 0°C under a nitrogen atmosphere, and add 1.8g of initiator ammonium persulfate while stirring , then add 500mL of potassium diurea phosphate solution prepared in step 1), and react for 60min; 21.58% to P 2 o 5 The phosphorus content in % is 26.65%, in K 2 The potassium content in O% is 15.85%. The water absorption capacity in deionized water was 679g / g.

Embodiment 2

[0039] A kind of preparation method of graft reaction type water-retaining slow-release nitrogen, phosphorus and potassium fertilizer, its steps are:

[0040] (1) Add 1360 g of potassium dihydrogen phosphate solution with a mass fraction of 50% and 600 g of industrial urea into the reactor, stir and mix at room temperature until completely dissolved until the pH is 8 to 9 to obtain a potassium diurea phosphate solution for subsequent use.

[0041] (2) Add 58g of acrylic acid, 32g of sodium acrylate and 0.54g of N,N'-methylenebisacrylamide to the empty reactor at 0°C under a nitrogen atmosphere, and add 1.8g of initiator ammonium persulfate while stirring , and then add 625mL of potassium diurea phosphate solution prepared in (1), and react for 60min; The nitrogen content of this fertilizer is 22.79%, expressed as P 2 o5 The phosphorus content in % is 28.14%, in K 2 The potassium content in O% is 16.74%. The water absorption capacity in deionized water was 613g / g.

Embodiment 3

[0043] A kind of preparation method of graft reaction type water-retaining slow-release nitrogen, phosphorus and potassium fertilizer, its steps are:

[0044] (1) Add 1360 g of potassium dihydrogen phosphate solution with a mass fraction of 50% and 600 g of industrial urea into the reactor, stir and mix at room temperature until completely dissolved until the pH is 8 to 9 to obtain a potassium diurea phosphate solution for subsequent use.

[0045] (2) Add 58g of acrylic acid, 32g of sodium acrylate and 0.54g of N,N'-methylenebisacrylamide to the empty reactor at 0°C under a nitrogen atmosphere, and add 1.8g of initiator ammonium persulfate while stirring , and then add 750mL of potassium diurea phosphate solution prepared in (1), and react for 60min; The nitrogen content of this fertilizer is 23.67%, expressed as P 2 o 5 The phosphorus content in % is 29.23%, in K 2 The potassium content in O% is 17.39%. The water absorption rate in deionized water was 303g / g.

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Abstract

The invention relates to a grafting reaction-type water-retaining slow-release nitrogen, phosphorus and potassium fertilizer and a preparation method thereof. The preparation method comprises the following steps: adding a potassium dihydrogen phosphate solution and industrial urea into a reactor to prepare a potassium biurea phosphate solution, adding an initiator ammonium persulfate into acrylic acid, sodium acrylate and N, N'-methylene bisacrylamide at 0 DEG C and in a nitrogen atmosphere, then adding the potassium diurea phosphate solution, and enabling reaction for 20-90 min; performing vacuum drying at 80 DEG C, and grinding to prepare the grafting reaction-type water-retaining slow-release nitrogen, phosphorus and potassium fertilizer. In the grafting reaction-type water-retaining slow-release nitrogen, phosphorus and potassium fertilizer, urea and potassium dihydrogen phosphate are grafted onto branched chains of a water-retaining polymer, so that the number of water-retaining groups of a water-retaining agent is increased and the water-retaining performance can be effectively improved; nitrogen, phosphorus and potassium nutrients on grafted chains can break away from a main chain of the water-retaining polymer through hydrolysis, then penetrate through a colloidal network structure and are released so as to achieve slow-release functions of the nitrogen, phosphorus, potassium nutrients.

Description

technical field [0001] The invention relates to the field of water-retaining slow-release fertilizers, in particular to a graft-reaction type water-retaining slow-release nitrogen, phosphorus and potassium fertilizer and a preparation method thereof. Background technique [0002] Water and fertilizers play an important role in agricultural production and are also important factors that limit crop growth. At present, low fertilizer use efficiency and water shortage are one of the serious problems facing the world. An effective way to solve this problem is to develop water and fertilizer integration, that is, to coordinate the supply of water and fertilizer. In addition to drip irrigation of water-soluble fertilizers for facilities and pipelines, the combination of water-retaining agents and fertilizers is also an effective way to solve this problem. At present, the water-retaining agent is mainly used as the coating material to physically wrap compound fertilizer or urea. H...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05B15/00C08F220/06C08F222/38C08J3/24C08K5/5399C08L33/02
CPCC05B15/00C08F220/06C08J3/244C08J2333/02C08K5/5399C08F222/385
Inventor 程冬冬刘艳张民杨越超刘之广陈宝成
Owner SHANDONG AGRICULTURAL UNIVERSITY
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