Controlled release fertilizer

A technology of controlled-release fertilizers and fertilizers, applied in the direction of fertilizer mixtures, layered/coated fertilizers, solid/semi-solid fertilizers, etc., which can solve problems such as unsuitable controlled-release fertilizers

Active Publication Date: 2020-09-18
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 applications 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 5

[0059] (1) Preparation of photocatalytic composites

[0060] 0.09 g of the surfactant shown in Table 1 below was dissolved in tetrachloroethylene, and TiO in the amount shown in Table 1 below was mixed thereinto 2 (average particle diameter of primary particles: 21 nm), and the mixture was sonicated and stirred for 20 minutes. Thus, a dispersion of a photocatalytic composite in which a surfactant is bound to the surface and inside of an aggregate of inorganic fine particles is prepared.

[0061] (2) Preparation of controlled release fertilizer

[0062] The dispersion solution of the photocatalytic composite prepared above, polyethylene [LDPE, MI (melt index, 190° C., load 2.16 kg, ASTM D1238), prepared above was used in the amount shown in Table 1 below: about 8 g / 10 min, D (Density): 0.925g / cm 3 ], ethylene vinyl acetate copolymer [MI (melt index, 190°C, load 2.16kg, ASTM D1238): about 1.8g / 10min, D (density): 0.94g / cm 3 , vinyl acetate content of about 20% by weight, and...

experiment example 1

[0071] Experimental example 1: Comparative experiment of photodegradation characteristics

[0072] 5 g of each of the controlled-release fertilizers of Examples and Comparative Examples and the coated fertilizer of Comparative Examples were taken, and pinholes were made for each fertilizer granule. Degradation evaluation was performed on the coating film remaining after the internal fertilizer was completely released.

[0073] Using Suntest CPS+ device (ATLAS) at 50°C with 400W / m 2 The intensity of the light with a wavelength of 300nm to 800nm ​​is irradiated onto the coating film.

[0074] 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 coating film was determined by the following general formula 1, and the results are shown in Table 1 and Table 2 below, respectively.

[0075] [Formula 1]

[0076]

[0077] [Table 1]

[0078]

[0079] [Table 2]

[0080]

[...

experiment example 2

[0082] Experimental example 2: TiO 2 Measurement of Z-average dispersed particle size

[0083] Use a dynamic light scattering instrument (Malvern Zetasizer Nano ZS90) to measure the dispersion solution of the photocatalytic composite of Example 1 and the TiO-containing solution of Comparative Example 1 2 Dispersion of TiO in solution 2 The z-average dispersed particle size.

[0084] The results are shown in Table 3 below.

[0085] [Table 3] TiO 2 Z average dispersed particle size

[0086] Example 1 Comparative example 1 TiO 2 Z average dispersed particle size (nm)

556 About 2.0×10 4

[0087] As shown in Table 3, it is confirmed that the z-average dispersed particle diameter of the dispersed solution of the photocatalytic composite of Example 1 is about 300 nm, therefore, the TiO used 2 The particles are uniformly dispersed and form aggregates of inorganic fine particles having a relatively small average particle diameter.

[0088] On ...

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Abstract

The present invention relates to a controlled release fertilizer and, more specifically, to a controlled release fertilizer comprising a photodecomposable capsule and a fertilizer, which is containedin a space encompassed by the photodecomposable capsule, the photodecomposable capsule comprising: a binder resin comprising a polyolefin and an ethylene-vinyl acetate copolymer; and a photocatalyst composite in which a surfactant having an HLB value of 1-6 is coupled to the surface or the inside of aggregates of inorganic microparticles.

Description

technical field [0001] Cross References to Related Applications [0002] This application claims Korean Patent Application No. 10-2018-0035998 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 11, 2019 -0027741, the entire contents of both patent applications are hereby incorporated by reference. [0003] The 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 period 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. [0005...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G5/35C05G3/40C08L23/08C08L23/00C08K3/012C08K3/22
CPCY02W30/40C05G5/30C05G3/40C05G5/37C05G5/38C05G5/35C08L23/0853C08L23/00C08K3/012C08K3/22C08K2003/2241C08K2003/2296C08K2201/011C05G5/12
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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