Water retaining slow-release / controled fertilizer, and preparation method

A technology of controlled-release fertilizers and fertilizers, applied in the form of fertilizers, fertilizer mixtures, fertilization devices, etc., can solve problems such as poor salt resistance, high cost, and application restrictions, and achieve enhanced air permeability, reduced application costs, and reduced fertilizer loss. Effect

Inactive Publication Date: 2007-10-10
ZHUHAI GUOJIA NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Generally speaking, the application of agricultural and forestry water retention materials is limited due to their high cost and poor salt resistance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment 1 (adopting process route 1)

[0034] formula:

[0035] Superphosphate (fertilizer) 99% polyvinyl alcohol (excipient additive) 0.1994% cumulusite (non-metallic mineral) 0.3% acrylic acid (water-soluble ethylenically unsaturated monomer) 0.3% acrylamide (water-soluble ethylenically unsaturated Monomer) 0.2% Potassium persulfate (water-soluble radical polymerization initiator) 0.0002%

[0036] N'N-methylenebisacrylamide (water-soluble radical polymerization crosslinking agent) 0.0004%

[0037] Preparation:

[0038] Add lentinite to acrylic acid and acrylamide solution, add potassium persulfate and N'N-methylenebisacrylamide in turn, dissolve completely, disperse in colloid mill for 10 minutes, heat in reactor at 80°C for 4 hours , sliced, dried at 110°C for 6 hours, crushed to 20 mesh, screened and graded to obtain the water-retaining material of lentinite mineral, then mixed with calcium superphosphate and polyvinyl alcohol evenly, granulated with a disc gr...

Embodiment 2

[0039] Embodiment 2 (processing route 2)

[0040] formula:

[0041]Acrylic acid (water-soluble ethylenically unsaturated monomer) 14.594% bentonite (non-metallic mineral) 24.4054% urea (fertilizer) 61% N'N-methylenebisacrylamide (water-soluble radical polymerization crosslinking agent) 0.0004% over Potassium sulfate (water-soluble radical polymerization initiator) 0.002%

[0042] Preparation:

[0043] Add bentonite and urea to the acrylic acid under stirring, stir well to dissolve them, add N'N-methylenebisacrylamide and potassium persulfate to the liquid to be polymerized, dissolve completely, and disperse in a colloid mill for 10 minutes. After heating at 90°C for 3 hours, slice it, dry it at 100°C, and pulverize it to obtain water-retaining slow / controlled release fertilizer granules. The water absorption rate of the obtained material is greater than 80 times, and the water content is less than 10%.

Embodiment 3

[0044] Embodiment 3 (processing route 2)

[0045] formula:

[0046] Acrylic acid (water-soluble ethylenically unsaturated monomer) 50.0014% bentonite (non-metallic mineral) 24.998% urea (fertilizer) 25% N'N-methylenebisacrylamide (water-soluble radical polymerization crosslinking agent) 0.0004% over Potassium sulfate (water-soluble radical polymerization initiator) 0.0002%

[0047] Preparation:

[0048] Add bentonite and urea to the acrylic acid under stirring, stir well to dissolve them, add N'N-methylenebisacrylamide and potassium persulfate to the liquid to be polymerized, dissolve completely, disperse in a colloid mill for 10 minutes, and put them in the reactor After heating at 90°C for 3 hours, slice it, dry it at 100°C, and pulverize it to obtain water-retaining slow / controlled release fertilizer granules. The water absorption rate of the obtained material is greater than 40 times, and the water content is less than 8%.

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PUM

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Abstract

This invention relates to a method for preparing water-retaining sustained/controlled-release fertilizer, which comprises: nonmetal minerals, water-soluble ethylene-based unsaturated monomer, water-soluble free radical polymerization initiator, crosslinker, fertilizer, and excipient. The method comprises physical mixing, chemical synthesis and coating. The obtained fertilizer has sustained/controlled release, water retaining, and soil improving functions. The fertilizer has such advantages as high fertilizer utility, low cost of water-retaining agent, convenient application, and no pollution.

Description

technical field [0001] The invention relates to a water-retaining slow / controlled release fertilizer and a preparation method thereof. Background technique [0002] For a long time, my country's agricultural fertilization has the problems of using simple fertilizer, one-time fertilization, and low fertilizer nutrient utilization rate. For example, the seasonal utilization rate of nitrogen fertilizer is only 30%-40%, the seasonal utilization rate of phosphorus fertilizer is 10-25%, and the utilization rate of potassium fertilizer is 10-25%. The rate is 50-60%. This is because conventional fertilizers have high water solubility, fast nutrient release, and short release period. The nutrient release period and intensity usually do not match the crop nutrient absorption period and intensity. [0003] In recent years, various slow / controlled release fertilizers researched and developed use various mechanisms to control the water solubility of conventional fertilizers, effectively ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00C05G5/00
Inventor 王海波刘仲康胡茂华熊静峦王建宏
Owner ZHUHAI GUOJIA NEW MATERIAL
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