Patent · US Active

Method for producing controlled-release fertilizer coated with polyurethane

US9416064B2 · kind B2 · utility

1Cited by

8References

13Claims

0Family size

Assignee

CHINESE ACADEMY OF AGRICULTURAL SCIENCES INSTITUTE OF AGRICULTURAL RESOURCES AND REGIONAL PLANNING · CN

Inventors

Xiangdong Yang · Beijing, CN
Bingqiang Zhao · Beijing, CN
Yanting Li · Sunnyvale, US
Juan Li · Nanhu, CN
Zhian Lin · Beijing, CN
Liang Yuan · Columbia, US

Key dates

Filing date	Aug 6, 2014
Grant date	Aug 16, 2016
Priority date	—
Expiry date	Aug 6, 2034

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC05G5/37
WIPO fieldBasic materials chemistry
WIPO sectorChemistry

Abstract

A method for producing controlled-release fertilizer coated with polyurethane is provided, wherein granular fertilizer is preheated under fluidized state in a fluidized bed; the surface of the granular fertilizer is pretreated after liquid paraffin being atomized; polyol and isocyanate are mixed in a nozzle, then atomized and sprayed onto the surface of the granular fertilizer; after the reaction materials are added, liquid paraffin is added for surface release treatment.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.