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Controlled release fertilizer

A technology for controlled-release fertilizers and fertilizers, applied in fertilizer mixtures, layered/coated fertilizers, solid/semi-solid fertilizers, etc., can solve problems such as being unsuitable for controlled-release fertilizers, and achieve overgrowth prevention, high compatibility, and uniform dispersion. Effect

Pending Publication Date: 2020-05-01
LG CHEM LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since biodegradable polymers have rapid moisture permeability and are decomposed by microorganisms within a period of 1 month to 6 months, they are not suitable for use in products that must be released within a minimum period of 1 month to 2 years. Controlled Release Fertilizer

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1 to 3

[0061] (1) Preparation of photocatalytic composite materials

[0062] 1.5 g of ethylene vinyl acetate copolymer [MI (melt index, 190 ° C, load 2.16 kg, ASTMD1238): about 1.8 g / 10 minutes, D (density): 0.94 g / cm 3 , the vinyl acetate content is about 20% by weight, and the melting point is 85° C.] dissolved in tetrachloroethylene, and TiO is mixed therein in the amount shown in Table 1 below 2 (average particle diameter of primary particles: 21 nm), and sonication was performed to prepare a dispersion solution of a photocatalytic composite material coated with ethylene vinyl acetate copolymer.

[0063] (2) Preparation of controlled release fertilizer

[0064] The amount shown in Table 1 below uses the dispersion solution of the photocatalytic composite material thus prepared, polyethylene [LDPE, MI (melt index, 190° C., load 2.16 kg, ASTM D1238): about 8 g / 10 minutes, D (Density): 0.925g / cm 3 ], ethylene vinyl acetate copolymer [MI (melt index, 190°C, load 2.16kg, ASTM D1238...

experiment example 1

[0074] Experimental example 1: Comparative test of photodegradation characteristics

[0075] Take each 5g of the controlled-release fertilizer of the embodiment and the coated fertilizer of the comparative example, and use a needle to make pinholes one by one to release the fertilizer completely. Then, the degradation evaluation was performed on the remaining coating film.

[0076] Using Suntest CPS+ equipment (ATLAS) at a temperature of 50 ℃ to light with a wavelength of 300nm to 800nm ​​at 400w / m 2 The intensity of the radiation hits the coating film.

[0077] Then, the decomposition rate of the binder resin, which can be obtained from the weight change of the coating film during 224 hours of light irradiation under the above-mentioned conditions, was determined by the following general formula 1, and the results are shown in Table 1 below.

[0078] [Formula 1]

[0079]

[0080] [Table 1]

[0081]

[0082] As shown in Table 1, it is determined that when light with ...

experiment example 2

[0083] Experimental Example 2: Evaluation of Release Characteristics of Fertilizers

[0084] 12.5 g each of the controlled-release fertilizer of the example and the coated fertilizer of the comparative example were added to 250 ml of distilled water to prepare a sample. Then, 1 ml of liquid was withdrawn from the samples at 25° C. on different days and analyzed (Kjeltec Analyzer 2300) for nitrogen content in the samples to measure the amount of released fertilizer.

[0085] [Table 2]

[0086]

[0087] As shown in Table 2, it was confirmed that the controlled-release fertilizer of Example 1 exhibited a release rate of 50% or more after 20 days and a release rate of 90% or more after 50 days. In contrast, it was also confirmed that the coated fertilizer of Comparative Example 1 exhibited a release rate of less than 40% after 20 days and even less than 70% or less on the 50th day.

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Abstract

The present invention relates to a controlled release fertilizer comprising: a photodegradable capsule comprising a binder resin inclusive of polyolefin and ethylene vinyl acetate copolymer; and a photocatalyst composite in which a (co)polymer including at least one repeat unit selected from an ethylenic repeat unit and a vinyl acetate repeat unit is coupled to the surface or inside of an aggregate of inorganic microparticles; and a fertilizer contained within a space surrounded by the photodegradable capsule.

Description

technical field [0001] Cross References to Related Applications [0002] This application claims Korean Patent Application No. 10-2017-0172272 filed with the Korean Intellectual Property Office on December 14, 2017 and Korean Patent Application No. 10-2018-0160288 filed with the Korean Intellectual Property Office on December 12, 2018 The entire contents of which are hereby incorporated by reference. [0003] The present invention relates to controlled release fertilizers. More specifically, the present invention relates to a controlled-release fertilizer that has high stability to moisture and has a rigid structure, and can easily control the release period of the fertilizer and can further achieve excellent photodegradation efficiency. Background technique [0004] Various controlled-release fertilizers have been developed for the purpose of labor-saving fertilization or for improving the effect of fertilizers according to the growth of plants. [0005] In these contro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/40C05G5/35
CPCC05G5/30C05G5/37C05G5/38C05G3/40C05G5/12C05G5/35
Inventor 金璨中李俊锡张一李相丽金志妍崔在薰
Owner LG CHEM LTD
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