Controlled-release fertilizers

Patent metadata

Field	Value
Publication number	US-11286213-B2
Application number	US-201916964924-A
Country	US
Kind code	B2
Filing date	Mar 18, 2019
Priority date	Mar 28, 2018
Publication date	Mar 29, 2022
Grant date	Mar 29, 2022

Abstract

The present disclosure relates to a controlled-release fertilizer and, more particularly, to a controlled-release fertilizer comprising a photodegradable capsule including a binder resin containing a polyolefin and an ethylene vinyl acetate copolymer; and a photocatalytic composite in which a surfactant having an HLB value of 1 to 6 is bonded to the surface or inside of aggregates of inorganic fine particles, and a fertilizer contained in a space surrounded by the photodegradable capsule.

First claim

The invention claimed is:

1. A controlled-release fertilizer, comprising:
a photodegradable capsule including a binder resin containing a polyolefin and an ethylene vinyl acetate copolymer; and a photocatalytic composite in which a surfactant having an HLB value of 1 to 6 is bonded to a surface or inside of aggregates of inorganic fine particles, and
a fertilizer contained in a space surrounded by the photodegradable capsule.

2. The controlled-release fertilizer of claim 1 , wherein the binder resin has a degradation rate of 40% or more which is derived from a weight change of the photodegradable capsule after irradiating a light having a wavelength of 300 to 800 nm to the fertilizer at an intensity of 400 w/m 2 for 224 hours.

3. The controlled-release fertilizer of claim 1 , wherein the inorganic fine particles include a primary particle having a cross-sectional diameter of 5 to 50 nm.

4. The controlled-release fertilizer of claim 1 , wherein the aggregates of inorganic fine particles have a cross-sectional diameter of 1 μm or less.

5. The controlled-release fertilizer of claim 1 , wherein the aggregates of inorganic fine particles have a cross-sectional diameter of 0.05 μm to 0.8 μm.

6. The controlled-release fertilizer of claim 1 , wherein the inorganic fine particles are titanium dioxide (TiO 2 ), zinc oxide (ZnO), or a mixture thereof.

7. The controlled-release fertilizer of claim 1 , wherein the photocatalytic composite includes 0.1 to 50 parts by weight of the surfactant having an HLB value of 1 to 6 relative to 100 parts by weight of the aggregates of inorganic fine particles.

8. The controlled-release fertilizer of claim 1 , wherein the aggregates of inorganic fine particles are contained in an amount of 0.05 to 8 parts by weight relative to 100 parts by weight of the binder resin.

9. The controlled-release fertilizer of claim 1 , wherein a weight ratio of the polyolefin: ethylene vinyl acetate copolymer in the binder resin is 1:1 to 6:1.

10. The controlled-release fertilizer of claim 1 , wherein the polyolefin is at least one selected from the group consisting of a high-density or low-density polyethylene, a linear low-density polyethylene, a polypropylene, an ethylene-propylene copolymer, a polybutene, a butene-ethylene copolymer and a butene-propylene copolymer.

11. The controlled-release fertilizer of claim 1 , wherein the ethylene vinyl acetate copolymer includes 1 to 45% by weight of the vinyl acetate repeating unit.

12. The controlled-release fertilizer of claim 1 , wherein the surfactant having an HLB value of 1 to 6 includes at least one selected from the group consisting of SPAN120, SPAN83, SPAN85, SPAN80, SPAN60, SPAN40, polyethylene-block-polyethylene glycol, Brij 52, Brij 72, Brij 93, Triton X35, Triton X15, PEGNOL 24-0, Lecithin, Monoolein, and Phytantriol.

13. The controlled-release fertilizer of claim 1 , further comprising a filler dispersed in the binder resin.

14. The controlled-release fertilizer of claim 13 , wherein the filler is contained in an amount of 10 to 300 parts by weight relative to 100 parts by weight of the binder resin.

15. The controlled-release fertilizer of claim 1 , wherein the fertilizer is a granular fertilizer.

Assignees

• Lg Chemical Ltd
• Farmhannong Co Ltd

Inventors

• Kim Chanjoong
• Lee Sangryeo
• Lee Joon Seok
• Jang Yil
• Kim Ji Yeon
• Choe Jae Hoon

Classifications

• C05G3/40 Primary

  for affecting fertiliser dosage or release rate; for affecting solubility · CPC title

• C05G5/12

  Granules or flakes · CPC title

• C08K2003/2296

  of zinc · CPC title

• C08K3/012

  Additives activating the degradation of the macromolecular compounds · CPC title

• C08L23/00

  Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers · CPC title