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Controlled released fertilizers based on self-assembled molecule coatings

Inactive Publication Date: 2003-04-17
MA ZHONGXIN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The solution provides a cost-effective, high-resistance coating that effectively controls the release of fertilizers, maintaining a stable release rate and minimizing attrition, thus expanding the application of controlled release fertilizers.

Problems solved by technology

The only limitation to using more than one type of amphiphilic molecule is that any combination of amphiphilic molecules must still be able to form the self assembly coating, even with the two or more different amphiphilic molecules in close proximity and interaction with one another.

Method used

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  • Controlled released fertilizers based on self-assembled molecule coatings
  • Controlled released fertilizers based on self-assembled molecule coatings
  • Controlled released fertilizers based on self-assembled molecule coatings

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0033] Synthesis of the Self-assembling Molecules for Coatings from Soybean Oil

[0034] Into a 1 liter three neck flask with a mechanic stirring system, 250 ml of soybean oil was charged. Then, 55 ml of triethylenetetraamine (TETA) was added, followed by addition of 0.25 g of iodine. The system was purged with argon for one hour. After the temperature in the flask reached 130.degree. C., it was continuously stirred for 20 hours at temperature. FTIR showed that most of the esters were converted into amides. A vacuum distillation process was carried out at 200.degree. C. at a pressure of 20 torr over three hours to remove glycerol and water. After cooling to 50.degree. C., 8 ml of deionized water was added into the system. The system was then stirred for 24 hours at 90.degree. C. A light yellowish, grease-like material was obtained.

example 2

[0035] Synthesis of the Self-assembling Molecules for Coatings from Tung Oil

[0036] The process was the same as in example 1, but the soybean oil was replaced with tung oil and no iodine was added. The material obtained was deep yellow.

[0037] Examples 3-7 show the production of CRFs from SAMs and other optional components.

example 3

[0038] Five hundred grams of granular urea was added into a 5 gallon rotary drum with flights, and heated to 75.degree. C. for 10 minutes. Approximately 7 g of SAM component made in Example 1 was sprayed onto the tumbling particles. After the urea granules were rolled for about 20 minutes, 3 g of MDI and 0.1 g of AIBN in 20 ml of methyl acetate were sprayed onto the urea granules. After the mass was heated up to 75.degree. C. again, the same amount of SAM was sprayed onto the mass. Then, 3 g of MDI and 0.1 g of AIBN in methyl acetate was sprayed once again. The tumbling particles were kept for an additional 20 minutes at 75.degree. C. before cooling down.

[0039] The controlled release properties of the coated fertilizers was tested by placing 14 g of the product in a wire mesh holder, then, placing it into a jar with 300 ml of deionized water at 23.degree. C. The jar with the product was agitated with an orbital shaker. Adequate water was taken out for elementary analysis to determin...

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Abstract

Controlled release fertilizers are provided and methods for their preparation, wherein the controlled release fertilizers are obtained through self-assembling molecules on the surfaces of the fertilizer particles, and then, preferably, linking these molecules into a network with another component. The designed molecules have a hydrophilic portion, which can interact with fertilizers, and a hydrophobic portion that make the molecule self-assemble and setup a moisture barrier. The molecules also preferably have at least two functional groups in order to form a network.

Description

[0001] The present invention relates to controlled release plant nutrients and crop protection compositions and particularly, to fertilizers showing a release in a certain period of time, and to a method for producing controlled release compositions.DISCUSSION OF THE BACKGROUND[0002] Encapsulations and coats of plant nutrients are the major methods for providing controlled release nutrients. Water-soluble nutrients encapsulated in water insoluble coatings are released at controlled rates. Sulfur coated fertilizers are widely used for controlled release purposes as disclosed in U.S. Pat. No. 3,342,577.[0003] Polymer encapsulation is another popular method to make controlled release fertilizers (CRF). Examples of these polymer encapsulation methods are found in U.S. Pat. No. 4,657,576 (use of a dicyclopentadiene based resin to encapsulate water-soluble fertilizers); U.S. Pat. No. 6,039,781; U.S. Pat. Nos. 4,711,659, 4,804,403, and 4,969,947 (urethane based coatings of fertilizers); U....

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C05B7/00C05G3/00C05G5/00C08G18/60
CPCB82Y30/00C05B7/00C05G3/0029C05G3/0041C08G18/60Y10S977/902Y10S977/773C05C1/02C05C3/00C05C9/005C05D1/02C05G5/30C05G5/37
Inventor MA, ZHONGXIN RYANTHOMAS, DONALD R.CIACCIO, CORINNE G.
Owner MA ZHONGXIN