Slow-release nitrogen fertilizer composition and its preparation method

Application Number: 00110382
Application Date: 2000.04.30
Publication Number: 1321623
Publication Date: 2001.11.14
Priority Information:
International: B01F17/00;B01J2/00;C05G3/00
Applicant(s) Name: China Petro-Chemical Corp.
Inventor(s) Name: Wang Dingcong;Li Yanbin
Patent Agency Code: 21102
Patent Agent: li wei
Abstract The present invention relates to a slow-release nitrogen fertilizer, it is a micrometer-size nitrogen-in-oil fertilizer which is made up by wrapping the melted nitrogen fertilizer with oil phase, emulsifier and emulsification aid. The water-soluble nitrogen fertilizer is formed from one or several kinds of urea, ammonium nitrate, sodium nitrate and calcium nitrate, the oil phase is one kinds of paraffin wax and microcrystal wax or their mixture, the emulsifier is one kind of several kinds of water-in-oil (W/O) emulsifiers whose HLB value is 3-6, and emulsification aid. Said slow-release nitrogen fertilizer can be slowly dissolved in water, and possesses strong water-resisting property, long slow-release period, uniformly released nutrients and low cost.