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Water-conserving fertilizer and method for preparing same

A fertilizer and ammonia water technology, applied in fertilizer mixtures, fertilization devices, applications, etc., can solve the problems of difficulty in wide-scale popularization and application, high prices, and few patent literature reports on comprehensive research on multifunctional water-retaining agents, etc. Achieve the effect of maintaining water availability, improving water utilization, and alleviating the simplicity of the production process

Inactive Publication Date: 2008-01-30
CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The TC water-retaining agent developed in Belgium has a variety of nutritional functions, and can be widely used in grassland greening, agricultural and forestry construction, sports field maintenance, road slope protection, etc. It has achieved good results in some countries, but its price remains high. Make it widely used
[0007] Based on domestic research, the research on a single water retaining agent is relatively mature, and there are few patent literature reports on comprehensive research on multifunctional water retaining agents

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0035] The first step is the preparation of polymer water-absorbent resin

[0036] (1) configuring 10% potassium hydroxide solution for neutralizing the acrylic acid monomer solution, and adjusting the pH value of the solution between 5-8 with ammonia solution;

[0037] (2) According to the ratio of acrylic acid: acrylamide: cationic monomer DMC: crosslinking agent mass of 7: 3: 0.047: 0.005, add acrylamide, cationic monomer and crosslinking agent to the neutralized acrylic acid solution in sequence, Heating and stirring under nitrogen protection;

[0038] (3) When the temperature of system (2) rises to about 40°C, add 15% ammonium persulfate-sodium sulfite solution. Wherein the mass of ammonium persulfate-sodium sulfite accounts for 0.3% of the total mass of the reaction monomers, and the total mass concentration of the monomers in the entire reaction system is 13%. Continue heating and stirring, control the polymerization temperature at 70-80°C, and react for 1-3 hours to ...

example 2

[0043] The first step is the preparation of polymer water-absorbent resin

[0044] (1) configure 15% potassium hydroxide solution, dilute the acrylic acid solution with it, and adjust the pH value of the solution between 5-7 with a small amount of ammonia solution;

[0045] (2) According to the ratio of acrylic acid: acrylamide: cationic monomer DMC: crosslinking agent is 7:3:0.035:0.005, add acrylamide, cationic monomer, crosslinking agent, nitrogen to the neutralized acrylic acid solution in sequence Heating and stirring under protection;

[0046] (3) Add 10% ammonium persulfate solution when the temperature of system (2) rises to about 35°C. Wherein the mass of ammonium persulfate accounts for 0.24% of the total mass of the monomers, and the total concentration of the monomers in the entire reaction system is 17%. Continue heating and stirring, control the polymerization temperature at 70-90°C, and react for 15 minutes to obtain a transparent gel-like polymer water-absorb...

example 3

[0052] The first step is the preparation of polymer water-absorbent resin

[0053] (1) Take a certain amount of acrylic acid monomer and dilute it, and directly use ammonia solution to neutralize part of the acrylic acid, and the neutralization degree is 75%;

[0054] (2) According to the ratio of acrylic acid: acrylamide: cationic monomer DMC: crosslinking agent is 6:4:0.03-0.04:0.005, add acrylamide, cationic monomer, and crosslinking agent to the neutralized acrylic acid solution in sequence , heating and stirring under nitrogen protection;

[0055] (3) Add 15% ammonium persulfate solution when the temperature of system (2) rises to about 45°C. Wherein the mass of ammonium persulfate accounts for 0.24% of the total mass of the monomers, and the total concentration of the monomers in the entire reaction system is 17%. Continue heating and stirring, control the polymerization temperature at 70-90°C, and react for 15 minutes to obtain a transparent gel-like polymer water-abs...

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Abstract

The invention discloses a water-conservation fertilizer pertaining to agricultural fertilizer preparation technical field and containing various cations with a plurality of nutrition functions. The preparation method of the water-conservation fertilizer is that: acrylic acid monomers are partially neutralized by potassium hydroxide solution and next the pH value thereof is adjusted between 4 and 9 with ammonia; then acrylamide, cationic compound, cross-linking agent and initiator are added to the solution in sequence; and the mixture is stirred continuously and reacts quickly under the protection of nitrogen; at last super absorbent polymer is obtained; the super absorbent polymer of 90-99wt percent (dry weight) is mixed with sequestering agent of 1 -10wt percent (dry weight) to obtain the fertilizer. The water-conservation fertilizer has the functions of salt resistance, draught resistance, water saving and conserving, providing nutrition, delaying water releasing, promoting rooting and improving soil structure, and is widely applied in shelterbelt forest development, desert prevention and cure, highway slope protection, lawn construction, soil improvement, gardening and agricultural and forestry industries, etc.

Description

technical field [0001] The invention belongs to the technical scope of agricultural fertilizer preparation, and in particular relates to a cationic agricultural water-retaining fertilizer containing various nutrients and a preparation method thereof. Background technique [0002] In our country, since the research on water retaining agent began in the 1980s, the research technology of single water retaining agent has been relatively mature, and it has been widely used in people's daily life and played an important role. In terms of agricultural and forestry applications, there are many studies on the application of water-retaining agents, but the actual promotion is not enough. The main reasons are as follows: First, the synthetic polymer water-retaining agent is limited to one or two traditional monomers (acrylic acid or acrylate), and the price is relatively high; the other main reason is that the function of the water-retaining agent is single, and it is difficult to meet...

Claims

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Application Information

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IPC IPC(8): C05G1/00C05G3/00
Inventor 胡树文周伟莉任雪芹张福锁
Owner CHINA AGRI UNIV
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