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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 excellent photodegradation efficiency, high compatibility, and uniformity. dispersion effect

Active Publication Date: 2020-09-25
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 penetration and are degraded by microorganisms within a period of 1 month to 6 months, they are not suitable for use in products that must be released over 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 Embodiment 4

[0082] (1) Preparation of photocatalytic composites

[0083] 0.43 g of a (meth)acrylate compound containing an alkylene glycol repeating unit shown in Table 1 below was dissolved in tetrachloroethylene, and TiO in an amount shown in Table 1 below was mixed thereinto. 2 (Average particle diameter of primary particles: 21nm), and by applying 20,000s -1 Stir the mixture at high shear rate for 20 min.

[0084] Then, 0.015 g of a thermal polymerization initiator (AIBN) was added thereto, and the mixture was stirred at 90° C. for 30 minutes under a nitrogen atmosphere. Thus, a dispersion in which a photocatalytic composite was bound to the surface and inside of an aggregate of a (meth)acrylate compound containing an alkylene glycol repeating unit and inorganic fine particles was prepared.

[0085] (2) Preparation of controlled release fertilizer

[0086] The dispersion solution of the photocatalytic composite prepared above, polyethylene [LDPE, MI (melt index, 190° C., load 2.16 ...

experiment example 1

[0093] Experimental example 1: Comparative experiment of photodegradation characteristics

[0094] Take 5g of the controlled-release fertilizer of each embodiment and the coated fertilizer of the comparative example, and make pinholes for each fertilizer granule. The degradation of the coating remaining after the complete release of the internal fertilizer was evaluated.

[0095] Using Suntest CPS+ device (ATLAS) at 50°C with 400W / m 2 The intensity of irradiates light with a wavelength of 300nm to 800nm ​​onto the envelope.

[0096] Then, when light was irradiated for 224 hours under the above conditions, the degradation rate of the binder resin obtained from the weight change of the envelope was determined by the following general formula 1, and the results are shown in Table 1 below.

[0097] [Formula 1]

[0098]

[0099] [Table 1]

[0100]

[0101] As shown in Table 1, it can be confirmed that when using light with a wavelength of 300nm to 800nm ​​at 400W / m 2 W...

experiment example 2

[0102] Experimental example 2: TiO 2 Measurement of Z-average dispersed particle size

[0103] Use a dynamic light scattering instrument (Malvern Zetasizer Nano ZS90) to measure the dispersion solution of the photocatalytic composite of embodiment 3 and the TiO-containing solution of comparative example 1 2 Dispersion of TiO in solution 2 The z-average dispersed particle size.

[0104] The results are shown in Table 2 below.

[0105] [Table 2] TiO 2 Z average dispersed particle size

[0106] Example 3 Comparative example 1 TiO 2 Z average dispersed particle size of TiO 2 (nm)

183 About 2.0×10 4

[0107] As shown in Table 2, it can be confirmed that the z-average dispersed particle diameter of the dispersion solution of the photocatalytic composite of Example 3 is about 183nm, therefore, the TiO used 2 The particles are uniformly dispersed and aggregates of inorganic fine particles having a relatively small average particle diameter a...

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Abstract

The present invention relates to controlled-release fertilizers and, more specifically, to controlled-release fertilizer comprising a photodegradable capsule and fertilizer included in the space surrounded by the photodegradable capsule, wherein the photodegradable capsule comprises: a binder resin comprising polyolefin and ethylene-vinyl acetate copolymer; and a photocatalyst composite in which a(meth)acrylate compound containing a C1-C10 alkylene glycol repeating units is bound to the surface or inside of an aggregate of inorganic microparticles.

Description

technical field [0001] Cross References to Related Applications [0002] This application claims Korean Patent Application No. 10-2018-0035997 filed with the Korean Intellectual Property Office on March 28, 2018 and Korean Patent Application No. 10-2019 filed with the Korean Intellectual Property Office on March 31, 2019 -0027740, the entire contents of both patent applications are hereby incorporated by reference. [0003] The present invention relates to a controlled release fertilizer. More specifically, the present invention relates to a controlled-release fertilizer having high stability to moisture and a rigid structure, and capable of easily controlling the release cycle of the fertilizer and further achieving excellent photodegradation efficiency. Background technique [0004] Various controlled-release fertilizers have been developed for labor-saving fertilization, or for the purpose of expressing the effect of the fertilizer according to the growth of plants. ...

Claims

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Application Information

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IPC IPC(8): C05G3/40C05G5/35C05G5/12C08L23/00C08L23/08C08L33/14C08K3/012B01J35/00C08K3/22
CPCY02W30/40C05G5/30C05G3/40C05G5/37C05G5/38C05G5/35C08L23/00C08L23/0853C08L33/14C08K3/012C08K2003/2241C08K2003/2296C08K2201/005C08K2201/011B01J35/39C05G5/12
Inventor 金璨中李相丽李俊锡张一金志妍崔在薰
Owner LG CHEM LTD
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