Chemically-synthesized polymerized-type high-water-retention slow-controllable-release fertilizer and preparation method thereof

A slow-controlled-release fertilizer, polymerization-type technology, applied in fertilization devices, fertilizer mixtures, applications, etc., can solve the problems of lower quality of agricultural products, large amount of chemical fertilizers, environmental pollution, etc.

Inactive Publication Date: 2016-01-13
QINGDAO XINYAODI AGRI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are the following main problems in the application of chemical fertilizers at present: one is that the amount of chemical fertilizers is large and the utilization rate is low; the other is that the application of chemical fertilizers is unreasonable, causing environmental pollution, reducing the quality of agricultural products, and serious food safety problems
However, in the current development and application of water-holding slow-release fertilizers, there are disadvantages such as high cost, poor salt resistance, and unstable effects of water-holding and fertilizer utilization, which restrict the large-scale application of water-holding slow-release fertilizers.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A compound polymerization type high water-retaining slow-release fertilizer, prepared by the following steps:

[0021] (1) Ingredients: 10 parts of attapulgite, 3 parts of phosphated polyvinyl alcohol, 3 parts of diatomaceous earth, 2 parts of gelatinized starch, 10 parts of acrylic acid, 0.0006 parts of potassium persulfate, N, N-methylene bis 0.00085 parts of acrylamide, 0.00035 parts of polyethylene glycol, and 60 parts of urea;

[0022] (2) Mix and dissolve: add attapulgite, phosphated polyvinyl alcohol, diatomaceous earth, and gelatinized starch into the acrylic acid solution, add urea, dissolve completely, and then add potassium persulfate and N,N-methylene Bisacrylamide and polyethylene glycol are stirred and dispersed by a high-speed mixer or dispersed by a colloid mill to obtain a mixed material;

[0023] (3) Polymerization reaction: the mixed material is heated in the reactor at 80-160°C for 3-8 hours to obtain a gel;

[0024] (4) Drying and pulverization: d...

Embodiment 2

[0026] A compound polymerization type high water-retaining slow-release fertilizer, prepared by the following steps:

[0027] (1) Ingredients: 5 parts of attapulgite, 5 parts of phosphated polyvinyl alcohol, 2 parts of diatomaceous earth, 3 parts of gelatinized starch, 5 parts of acrylic acid, 0.001 part of ammonium persulfate, N, N-methylene bis 0.0006 parts of acrylamide, 0.0002 parts of polyethylene glycol, and 80 parts of compound fertilizer;

[0028] (2) Mix and dissolve: add attapulgite, phosphated polyvinyl alcohol, diatomaceous earth, and gelatinized starch into the acrylic acid solution, add compound fertilizer, dissolve completely, and then add ammonium persulfate and N, N-methylene Based on bisacrylamide and polyethylene glycol, use a high-speed mixer for stirring and dispersing or use a colloid mill for dispersing to obtain a mixed material;

[0029] (3) Polymerization reaction: the mixed material is heated in the reactor at 80-160°C for 3-8 hours to obtain a gel;...

Embodiment 3

[0032] A compound polymerization type high water-retaining slow-release fertilizer and a preparation method thereof, which are prepared through the following steps:

[0033] (1) Ingredients: 8 parts of attapulgite, 4 parts of phosphated polyvinyl alcohol, 2.5 parts of diatomaceous earth, 2.5 parts of gelatinized starch, 7.5 parts of acrylamide, 0.0008 parts of sodium persulfate, N, N-methylene 0.00075 parts of bisacrylamide, 0.00025 parts of polyethylene glycol, and 70 parts of superphosphate;

[0034] (2) Mix and dissolve: add attapulgite, phosphated polyvinyl alcohol, diatomaceous earth, and gelatinized starch into the acrylamide solution, add superphosphate, dissolve completely, and then add sodium persulfate and N, N- Methylenebisacrylamide and polyethylene glycol are stirred and dispersed by a high-speed mixer or dispersed by a colloid mill to obtain a mixed material;

[0035] (3) Polymerization reaction: the mixed material is heated in the reactor at 80-160°C for 3-8 ho...

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PUM

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Abstract

The invention discloses a chemically-synthesized polymerized-type high-water-retention slow-controllable-release fertilizer which is prepared from the following raw materials including: attapulgite, polyvinyl alcohol phosphate, diatomite, gelatinized starch, a water-soluble ethylene-type unsaturated monomer, a water-soluble free radical polymerization initiator, a composite crosslinking agent and fertilizers through a chemical polymerization method. The fertilizer has the effects of slow-controlled releasing, water retention and releasing and soil improvement, is effectively increased in utilization rate and solves the defect of fertilizer loss and insufficient supplement due to one-time fertilizer, and can effectively hold the water in soil, improve soil structure and improve breathability of the soil. A slow-controllable-release supporter is prepared from a mixture of the attapulgite, the phosphate polyvinyl alcohol, the diatomite and the gelatinized starch with the composite crosslinking agent, so that the fertilizer is significantly improved in water retention. The fertilizer is low in production cost, is ecological and environment-friendly and is suitable for large-scale popularization and application.

Description

technical field [0001] The invention relates to a compound polymerization type high water retention slow controlled release fertilizer and a preparation method thereof, belonging to the field of fertilizer processing, in particular to a water retention slow controlled release fertilizer. Background technique [0002] Chemical fertilizers play an important role in agricultural production and are the largest material investment in agricultural production, accounting for about 50% of all productive expenditures. According to statistics from the Food and Agriculture Organization of the United Nations, the application of chemical fertilizers can increase crop yield by about 55%, and increase total output by about 30%. However, there are the following main problems in the current application of chemical fertilizers: first, the amount of chemical fertilizers used is large and the utilization rate is low; second, the use of chemical fertilizers is unreasonable, causing environmental...

Claims

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Application Information

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