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Methods of making and using a superabsorbent polymer product including a bioactive, growth-promoting additive

A superabsorbent polymer, bioactive technology, used in plant growth regulators, botanical equipment and methods, chemical instruments and methods, etc.

Active Publication Date: 2007-01-31
UNITED PHOSPHATE PROD MAURITIUS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Although pesticide microparticles have been produced in combination with starch for many years, no one has succeeded in entrapping pesticides in starch-based SAP products suitable for large-scale agricultural applications

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Example 1: Spraying SAP particles using Asset TM pesticide

[0056] Distilled water (1,400 ml) was placed in a 3 liter resin kettle and stirred continuously with a stirrer. Slowly add starch flour or grits (110 g) to the kettle and stir the resulting mixture for about 5 minutes. While heating, a slow flow of nitrogen gas was passed through the mixture until the mixture was heated to a temperature of about 95°C. When this temperature was reached, the mixture was kept at this temperature with stirring for about 45 minutes to confirm that the starch had gelled. The heating mantle is then removed and the resin jug is placed in a cold water bath. The mixture was continuously stirred under nitrogen atmosphere until the temperature dropped to 25 °C. Acrylonitrile (115 g) and 2-acrylamido-2-methylpropanesulfonic acid (23 g) were added. The resulting mixture was kept stirring for about 10 minutes under nitrogen atmosphere. While cooling the mixture, a catalytic solution co...

Embodiment 2

[0113] Example 2: Applying Assets to SAP particles TM pesticide slurry

[0114] SAP microparticles having a mesh size between about 20 and about 40 were prepared according to the method described in Example 1. Mix about 25g of SAP particles with 1 liter of Asset TM Aqueous slurry mixing of pesticides. Stir the resulting pale green slurry to ensure that Asse TM Pesticides are evenly distributed throughout the slurry. The slurry was analyzed for the presence of various bioactive components using the Fertilizer Analysis Test. Results are reproduced in Table IV.

[0115] Table IV. Fertilizer Analysis of the SAP Product of Example 2

[0116] Nutrient % availability

[0117] Nitrogen 5.66

[0118] Ammonia 2.47

[0119] Phosphorus 7.96

[0120] P 2 o 518.24

[0121] Potassium 3.94

[0122] K 2 O 4.74

[0123] Calcium <0.01

[0124] Magnesium <0.01

[0125] Sodium 0.18

[0126] Boron 219.79

[0127] Iron 847.58

[0128] Manganese 673.47

[0129] Copper 452.49

...

Embodiment 3

[0132] Example 3: Spraying SAP particles using Miracle-Gro TM pesticide

[0133] SAP microparticles having a mesh size between about 10 and about 20 were prepared according to the method described in Example 1. Using a standard, readily available garden sprayer, spray about 6 pints to about 8 pints of Miracle-Gro TM The pesticide is sprayed onto approximately 1 lb of SAP product. Agitate the resulting starch-based SAP product particles to ensure that Miracle-Gro TM Pesticides are evenly distributed. After being sprayed, the SAP particles are light green in color.

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PUM

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Abstract

A method of entrapping a bioactive growth-promoting additive in a starch matrix to form a starch-based, superabsorbent polymer product for agricultural applications and the resulting product, comprising: (1) graft polymerization— monomers and a starch to form a starch graft copolymer comprising a starch matrix; (2) isolating the starch graft copolymer; (3) forming particles of the starch graft copolymer; and (4) adding a A bioactive growth-promoting additive is provided so that the starch matrix contains at least some of the bioactive growth-promoting additive. This starch-based SAP containing bioactive growth-promoting additives is placed in close proximity to a crop, root, seed, or seedling and promotes the growth of that crop, root, seed, or seedling due to increased availability of beneficial nutrients. .

Description

Technical field [0001] The present invention relates to agricultural improvement agents, and more specifically to a method of manufacturing and using a superabsorbent polymer product containing a biologically active growth-promoting additive. Background technique [0002] Over the past three decades, polymer chemists and soil scientists have developed controlled-release pesticides for agricultural use. The two basic goals of controlled-release pesticides are: (1) to increase the effectiveness of pesticides, and (2) to reduce the adverse environmental consequences of pesticide application. Some prior art controlled release pesticides have been encapsulated in starch. These prior art starch encapsulated controlled release pesticide products are generally formed by mixing starch and pesticide and the mixture is formed into a spherical shape. These starch-encapsulated pesticides provide rate-limited release of pesticide particles from the starch, with release largely controlle...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L3/04C09K17/00C08H8/00A01N25/10C05G3/00C05G3/60C05G3/70C05G3/80C08F251/00C08G63/48
CPCC08F251/00A01N25/10C05G3/04C05G3/0047C05G3/80C05G5/40Y10T428/254Y10T428/2982Y10T428/2991C08G63/00C08G63/48C08L3/04
Inventor 威廉姆·麦基·杜安尼史蒂文·威廉姆·杜安尼米兰·H·萨维奇
Owner UNITED PHOSPHATE PROD MAURITIUS LTD
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