Controlled-release type fertilizer with decreased floating property comprising tri-block copolymer and method for preparing the same

Patent metadata

Field	Value
Publication number	US-2020270184-A1
Application number	US-201816646959-A
Country	US
Kind code	A1
Filing date	Sep 13, 2018
Priority date	Sep 13, 2017
Publication date	Aug 27, 2020
Grant date	—

Abstract

The present invention relates to a controlled-release type fertilizer with outstandingly decreased floating property, comprising a granular fertilize core; a coating layer (shell) formed on the surface of the granular fertilizer core, and comprising olefin-based resin; and additives attached on the coating layer, and comprising ethylene oxide-propylene oxide-ethylene oxide(EO-PO-EO) or propylene oxide-ethylene oxide-propylene oxide(PO-EO-PO) tri-block copolymer.

First claim

1 . A controlled-release type fertilizer comprising:
a granular fertilizer core; a coating layer formed on the surface of the granular fertilizer core, the coating layer comprising an olefin-based resin; and additives attached on the coating layer, the additives comprising an ethylene oxide-propylene oxide-ethylene oxide(EO-PO-EO) tri-block copolymer or a propylene oxide-ethylene oxide-propylene oxide(PO-EO-PO) tri-block copolymer.

2 . The controlled-release type fertilizer according to claim 1 , wherein the olefin-based resin is polyolefin or a copolymer of olefin and ethylene vinyl acetate.

3 . The controlled-release type fertilizer according to claim 1 , wherein the ethylene oxide-propylene oxide-ethylene oxide(EO-PO-EO) or propylene oxide-ethylene oxide-propylene oxide(PO-EO-PO) tri-block copolymer has a HLB value of 1 to 10.

4 . The controlled-release type fertilizer according to claim 1 , wherein the propylene oxide block in the tri-block copolymer has a weight average molecular weight of 950 to 4,000.

5 . The controlled-release type fertilizer according to claim 1 , wherein the propylene oxide block in the tri-block copolymer is included in an amount of 50 to 95 wt %, based on the total weight of the tri-block copolymer.

6 . The controlled-release type fertilizer according to claim 1 , wherein the ethylene oxide block in the tri-block copolymer has a weight average molecular weight of 50 to 2,000.

7 . The controlled-release type fertilizer according to claim 1 , wherein the ethylene oxide block in the tri-block copolymer is included in an amount of 5 to 50 wt % based on the total weight of the tri-block copolymer.

8 . The controlled-release type fertilizer according to claim 1 , comprising 0.025 wt % to 0.5 wt % of the additives based on the weight of the controlled-release type fertilizer.

9 . The controlled-release type fertilizer according to claim 1 , wherein the additives further comprise inorganic powder.

10 . The controlled-release type fertilizer according to claim 9 , wherein the inorganic powder has a specific surface area of 100 m 2 /g to 500 m 2 /g.

11 . The controlled-release type fertilizer according to claim 9 , wherein the inorganic powder has a particle size of 1 μm to 500 μm.

12 . The controlled-release type fertilizer according to claim 9 , wherein the inorganic powder is hydrophilic inorganic powder having a hydroxyl group.

13 . The controlled-release type fertilizer according to claim 9 , wherein the inorganic powder is included in the amount of 0.01 wt % to 1 wt %, based on the weight of the controlled-release type fertilizer.

14 . A method for preparing a controlled-release type fertilizer, comprising the steps of:
i) coating the surface of a granular fertilizer core with a coating composition comprising an olefin-based resin to form a first coating layer; and ii) coating the first coating layer with liquid additives comprising an ethylene oxide-propylene oxide-ethylene oxide(EO-PO-EO) tri-block copolymer or a propylene oxide-ethylene oxide-propylene oxide(PO-EO-PO) tri-block copolymer.

15 . The method of claim 14 , wherein the coating step (ii) comprises adding the liquid additives in an amount of 0.025 wt % to 0.5 wt % based on the weight of the controlled-release type fertilizer.

16 . The method of claim 14 , wherein the first coating layer in step (i) is a shell covering the granular fertilizer core.

17 . The controlled-release type fertilizer of claim 1 , wherein the ethylene oxide-propylene oxide-ethylene oxide(EO-PO-EO) or propylene oxide-ethylene oxide-propylene oxide(PO-EO-PO) tri-block copolymer has a HLB value of 1 to 5, and wherein
a weight average molecular weight of the propylene oxide block is 1500 to 4000.

18 . The controlled-release type fertilizer of claim 17 , wherein the propylene oxide block is included in an amount of 50 to 95 wt %, based on the total weight of the tri-block copolymer and the ethylene oxide block in the tri-block copolymer has a weight average molecular weight of 50 to 2,000.

19 . The controlled-release type fertilizer of claim 18 , wherein the ethylene oxide block is included in an amount of 5 to 50 wt %, based on the total weight of the tri-block copolymer.

20 . The controlled-release type fertilizer of claim 1 , wherein the coating layer is a shell covering the granular fertilizer core and the additives are uniformly attached to the surface of the shell.

Assignees

• Lg Chemical Ltd
• Farmhannong Co Ltd

Inventors

• KIM Mihee
• Joo Hyosook
• Park Eun Kyoung
• Choi Hyeon
• Yoon Kiyoul
• Lee Joon Seok

Classifications

• C05C9/005 Primary

  Post-treatment · CPC title

• C05G5/37

  layered or coated with a polymer · CPC title

• C05G5/38

  layered or coated with wax or resins · CPC title

• C05G3/44 Primary

  for affecting solubility · CPC title

• C05G5/30

  Layered or coated, e.g. dust-preventing coatings · CPC title