Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A kind of clathrate type slow-release urea fertilizer and its preparation method

A slow-release urea and clathrate technology, applied in urea compound fertilizers, fertilizer mixtures, solid/semi-solid fertilizers, etc., can solve problems such as difficult degradation, secondary pollution of the ecological environment, etc., achieve simplified production processes, promote degradation, Realize the effect of industrialized production

Active Publication Date: 2021-06-22
CHINA UNIV OF PETROLEUM (BEIJING)
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most polymer materials are not easy to degrade in the natural environment, causing secondary pollution to the ecological environment

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A kind of clathrate type slow-release urea fertilizer and its preparation method
  • A kind of clathrate type slow-release urea fertilizer and its preparation method
  • A kind of clathrate type slow-release urea fertilizer and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) A certain amount of polybutylene succinate (number-average molecular weight is 100000g / mol) is uniformly mixed with urea at room temperature in a container, and the mass ratio of polybutylene succinate to urea is 1: 2.

[0033] (2) The mixture obtained in step (1) was added into a Brabender internal mixer for blending, the temperature of the blending was 125° C., and the time was 15 minutes.

[0034] (3) Grinding the polymer-urea complex obtained in step (2) to obtain solid particles with different particle diameters (1-2mm, 2-3mm, 3-4mm, 4-5mm) is the urea sustained-release product. A clathrate-type slow-release urea fertilizer. The solid granular slow-release urea fertilizers with different particle sizes are sieved to obtain fractions with different particle sizes, so that slow-release urea fertilizers with different slow-release effects can be prepared.

Embodiment 2

[0036] (1) A certain amount of polyethylene succinate (number-average molecular weight is 200000g / mol) is uniformly mixed with urea at room temperature in a container, and the mass ratio of polyethylene succinate and urea is 1: 3.

[0037] (2) Add the mixture obtained in step (1) into an open mill for blending, the temperature of the blending is 120° C., and the time is 15 minutes.

[0038](3) Pulverize the polymer-urea complex obtained in step (2) to obtain solid particles (1-2mm, 2-3mm, 3-4mm, 4-5mm) of different particle sizes, which are urea sustained-release properties. A clathrate-type slow-release urea fertilizer. The solid granular slow-release urea fertilizers with different particle sizes are sieved to obtain fractions with different particle sizes, so that slow-release urea fertilizers with different slow-release effects can be prepared.

Embodiment 3

[0040] (1) A certain amount of polytrimethylene succinate (the number average molecular weight is 500000g / mol) and urea are uniformly mixed in a container at room temperature, and the mass ratio of polytrimethylene succinate to urea is 1:4.

[0041] (2) Add the mixture obtained in step (1) into a twin-screw extruder for blending. The blending temperature is 120° C. and the time is 20 min.

[0042] (3) Extrude and granulate the polymer-urea compound obtained in step (2) to obtain solid particles with different particle lengths (1-2mm, 2-3mm, 3-4mm, 4-5mm), that is, urea buffer A clathrate-type slow-release urea fertilizer with release properties. Slow-release urea fertilizers with different slow-release effects can be prepared by controlling the length of the slow-release urea fertilizer particles or matching different extrusion calibers.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
particle diameteraaaaaaaaaa
Login to View More

Abstract

The invention discloses an inclusion complex type slow-release urea fertilizer and a preparation method thereof. The fertilizer includes a degradable polymer and urea; the degradable polymer entraps the urea. Its preparation method includes the following steps: mixing the degradable polymer and the urea, performing shear blending, and then granulating or pulverizing to obtain the clathrate-type slow-release urea fertilizer with different particle sizes . The slow-release urea fertilizer of the invention has high loading rate, excellent urea slow-release performance, high nutrient utilization rate, and environmental friendliness; the preparation process has good operability, high production efficiency, and easy-to-obtain raw materials for market promotion.

Description

technical field [0001] The invention relates to a polymer / urea clathrate slow-release urea fertilizer and a preparation method thereof, belonging to the field of organic-inorganic composite materials. Background technique [0002] At present, the utilization rate of chemical fertilizers in agriculture is low, and the loss of nitrogen is relatively serious, with a utilization rate of about 30% (Muhammad Yasin Naz; Shaharin Anwar Sulaiman. Slow release coating remedy for nitrogen loss from conventional urea: a review. Journal of Controlled Release, 2016, 225, 109 -120). Due to the huge loss of urea through leaching, surface runoff and ammonia volatilization (Md.Mukhlesur Rahman; Mohamad Amran Mohd.Sallehac; UmerRashida; Amimul Ahsan; Mohammad MujaffarHossain; Chang Six Ra. -A review. Arabian Journal of Chemistry, 2014, 7, 139-155), not only causing huge economic losses, but also causing greenhouse gas emissions, water eutrophication and other issues, bringing a series of seri...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C05C9/00C05G3/40C05G5/12
CPCC05C9/00C05G3/00
Inventor 叶海木李红芳王才水陈晓彤
Owner CHINA UNIV OF PETROLEUM (BEIJING)
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com