Water retention agent coating-type high-water-retentivity slow-release fertilizer and preparation method thereof

A technology of slow and controlled release fertilizer and water retention agent, which is applied in fertilization devices, fertilizer mixtures, applications, etc., can solve the problems of restricting the large-scale application of water-retaining slow and controlled release fertilizers, unreasonable application of chemical fertilizers, and reduced quality of agricultural products, etc. The effect of large-scale promotion and application, reducing crop supply shortage and low production cost

Inactive Publication Date: 2015-11-25
QINGDAO WEIYUANDA TECH SERVICE 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 produ...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A water-retaining agent coating type high-water-retaining slow-release fertilizer is prepared by the following steps:

[0020] (1) Ingredients: 10 parts attapulgite, 3 parts phosphated polyvinyl alcohol, 3 parts bentonite, 2 parts gelatinized starch, 10 parts acrylic acid, 0.0006 parts potassium persulfate, N,N-methylenebisacrylamide 0.00085 parts, 0.00035 parts polyethylene glycol, 60 parts urea ingredients;

[0021] (2) Mixing and dissolving: add attapulgite, phosphated polyvinyl alcohol, bentonite, and gelatinized starch into the acrylic acid solution, dissolve completely, and then add potassium persulfate and N, N-methylene bisacrylamide, poly Ethylene glycol is stirred and dispersed by a high-speed mixer or dispersed by a colloid mill to obtain a slow and controlled release fertilizer solution;

[0022] (3) Coating: spray or coat the solution to be polymerized uniformly around the fertilizer particles, and heat it at 60-120°C for 2-6 hours to obtain a water-retaining age...

Embodiment 2

[0024] A water-retaining agent coating type high-water-retaining slow-release fertilizer is prepared by the following steps:

[0025] (1) Ingredients: 5 parts of attapulgite, 5 parts of phosphated polyvinyl alcohol, 2 parts of bentonite, 3 parts of gelatinized starch, 5 parts of acrylic acid, 0.001 parts of ammonium persulfate, N,N-methylenebisacrylamide 0.0006 parts, 0.0002 parts polyethylene glycol, and 80 parts compound fertilizer;

[0026] (2) Mixing and dissolving: Add attapulgite, phosphated polyvinyl alcohol, bentonite, and gelatinized starch into the acrylic acid solution, dissolve completely, and then add ammonium persulfate and N,N-methylenebisacrylamide, poly Ethylene glycol is stirred and dispersed by a high-speed mixer or dispersed by a colloid mill to obtain a slow and controlled release fertilizer solution;

[0027] (3) Coating: spray or coat the solution to be polymerized uniformly around the fertilizer particles, and heat it at 60-120°C for 2-6 hours to obtain a wat...

Embodiment 3

[0029] A water-retaining agent coating type high water-retaining slow-release fertilizer and a preparation method thereof are prepared by the following steps:

[0030] (1) Ingredients: 8 parts of attapulgite, 4 parts of phosphated polyvinyl alcohol, 2.5 parts of bentonite, 2.5 parts of gelatinized starch, 7.5 parts of acrylamide, 0.0008 parts of sodium persulfate, N,N-methylene dipropylene The proportion of 0.00075 parts of amide, 0.00025 parts of polyethylene glycol and 70 parts of superphosphate;

[0031] (2) Mixing and dissolving: Add attapulgite, phosphate esterified polyvinyl alcohol, bentonite, and gelatinized starch into the acrylamide solution, dissolve completely, and then add sodium persulfate and N,N-methylenebisacrylamide, Polyethylene glycol is stirred and dispersed by a high-speed mixer or dispersed by a colloid mill to obtain a slow and controlled release fertilizer solution;

[0032] (3) Coating: spray or coat the solution to be polymerized uniformly around the ferti...

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PUM

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Abstract

The invention discloses a water retention agent coating-type high-water-retentivity slow-release fertilizer which is prepared from attapulgite, phosphated polyvinyl alcohol, bentonite, gelatinized starch, a water-soluble ethylene unsaturated monomer, a water-soluble free-radical polymerization initiator, a composite crosslinking agent, a fertilizer and the like by a coating process. The product has the functions of slowly releasing the fertilizer, retaining and releasing water, improving the soil and the like, effectively enhances the fertilizer utilization ratio, reduces the fertilizer loss and insufficient crop nutrient supply due to single-dose application, effectively keeps the soil moisture, improves the soil structure and enhances the air permeability of the soil. The slow-release carrier adopts the mixture of the attapulgite, phosphated polyvinyl alcohol, bentonite and gelatinized starch; and the composite crosslinking agent is adopted to obviously enhance the water retention effect of the product. The water retention agent coating-type high-water-retentivity slow-release fertilizer has the advantage of low production cost, is ecological and environment-friendly, and is convenient for large-scale popularization and application.

Description

technical field [0001] The invention relates to a water-retaining agent-coated high water-retaining slow-controlled release fertilizer and a preparation method thereof, belonging to the field of fertilizer processing, in particular to a water-retaining 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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IPC IPC(8): C05G3/00C05G3/04C05G3/80
Inventor 耿彩红韩昊
Owner QINGDAO WEIYUANDA TECH SERVICE CO LTD
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