Novel controlled-release fertilizer coating agent and preparation method thereof

A technology of controlled-release fertilizer and coating agent, which is applied in the direction of fertilization device, fertilizer mixture, application, etc., to achieve good convenience and targeted effect

Inactive Publication Date: 2014-04-30
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

How to overcome the specificity and selectivity of different crops for the coating materials of slow and controlled release fertilizers, and realize the universality of the same (like) coating materials has become a bottleneck that restricts the development of slow and controlled release fertilizers

Method used

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  • Novel controlled-release fertilizer coating agent and preparation method thereof
  • Novel controlled-release fertilizer coating agent and preparation method thereof
  • Novel controlled-release fertilizer coating agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] The glass transition temperature Tg of the monomer copolymer used in the design coating agent is 30°C, styrene (Tg=100°C) is selected as the rigid monomer, and n-butyl acrylate (Tg=-54°C) is used as the flexible monomer to carry out polymerization :

[0055] (1) Fully mix 60.75g of styrene and 29.25g of n-butyl acrylate to obtain mixed solution 1. Take out 13.5g of mixed solution 1 and add it to the reactor, add 0.225g of sodium bicarbonate, 0.18g of dodecyl mercaptan, 0.72g of sodium p-styrene sulfonate, 100mL of deionized water, stir for 30 minutes, and then heat up to 75 ℃, add 0.27g ammonium persulfate, and react for 30 minutes to obtain seed emulsion.

[0056] (2) The remaining 1.08 g of ammonium persulfate and 2.88 g of sodium p-styrenesulfonate were dissolved in 110 mL of deionized water to obtain a mixed solution 2.

[0057] (3) Raise the temperature of the reactor to 82°C, add the mixed solution 1 and the mixed solution 2 dropwise at the same time, and contro...

Embodiment 2

[0062] The Tg of the coating agent is designed to be 33°C, and methyl methacrylate (Tg=105°C) is selected as the rigid monomer, and n-butyl acrylate (Tg=-54°C) is used as the flexible monomer to carry out polymerization:

[0063] (1) 60.75 g of methyl methacrylate and 29.25 g of n-butyl acrylate were thoroughly mixed to obtain a mixed solution 1. Take out 13.5g of mixed solution 1 and add it to the reactor, add 0.225g of sodium bicarbonate, 0.18g of dodecyl mercaptan, 0.72g of sodium p-styrene sulfonate, 100mL of deionized water, stir for 30 minutes, and then heat up to 75 ℃, add 0.27g ammonium persulfate, and react for 30 minutes to obtain seed emulsion.

[0064] (2) The remaining 1.08 g of ammonium persulfate and 2.88 g of sodium p-styrenesulfonate were dissolved in 110 mL of deionized water to obtain a mixed solution 2.

[0065] (3) Raise the temperature of the reactor to 82°C, add the mixed solution 1 and the mixed solution 2 dropwise at the same time, and control the dro...

Embodiment 3

[0070] The coating agent Tg is designed to be 34°C, methyl methacrylate (Tg=105°C) is selected as rigid monomer, n-butyl acrylate (Tg=-54°C) is used as flexible monomer, acrylic acid (Tg=106°C) is Functional monomers, polymerized:

[0071] (1) 56.7 g of methyl methacrylate and 28.8 g of n-butyl acrylate were fully mixed to obtain a mixed solution 1. Take out the mixed solution 1 of 17.1g and add in the reactor, add 0.18g sodium bicarbonate simultaneously, 0.15g dodecyl mercaptan, 0.72g sodium p-styrene sulfonate, 100mL deionized water, after stirring for 30 minutes, heat up to At 75°C, 0.18g of potassium persulfate was added and reacted for 30 minutes to obtain a seed emulsion.

[0072] (2) The remaining 68.4 g of the mixed solution 1 was mixed with 4.5 g of acrylic acid to obtain the mixed solution 2 . The remaining 0.72 g of potassium persulfate and 2.88 g of sodium p-styrenesulfonate were dissolved in 110 mL of deionized water to obtain a mixed solution 3.

[0073] (3) R...

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Abstract

The invention discloses a novel controlled-release fertilizer coating agent and a preparation method thereof. The coating agent synthetic monomers mainly include rigid monomer with higher Tg, flexible monomer with lower Tg and functional monomer. Type and content of the functional monomer are changed, and functional groups with different hydrophilicity and content are introduced on a polymer chain, thus, a polymeric membrane has different permeability, control on release rate of fertilizer is realized, and requirements of crops in different growth cycles are satisfied. The coating material with such structure has good film-forming ability, water tightness and release control property to fertilizer, and wide adaptability.

Description

technical field [0001] The invention relates to a novel controlled-release fertilizer coating agent and a preparation method thereof. The film made of the coating agent can realize the controlled release of fertilizers. Background technique [0002] The total population of our country has reached 1.4 billion. In order to feed nearly 20% of the world's population, we must pay attention to the development of agriculture. In order to increase the yield of crops, a large amount of fertilizer must be used. The cost of fertilizer accounts for 50% of the total expenditure of agricultural production and is the largest material investment. However, the utilization rate of nitrogen fertilizer in my country is only about 30%, far below the average level of developed countries. The loss of fertilizer not only causes a waste of economic energy, but also easily causes serious environmental problems. Therefore, slow and controlled release fertilizers have become the development directio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00C05G3/08C05G3/90
Inventor 周正发孙利吴雪梅徐卫兵马海红任凤梅
Owner HEFEI UNIV OF TECH
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