Degradable polymer filmcoated controlled release fertilizer, preparation thereof and special filmcoated material

A coating material and controlled-release fertilizer technology, which is applied in the field of new degradable polymer-coated controlled-release fertilizers, can solve the problems of low utilization rate of coating raw materials, affect the controlled-release performance, and low mixing degree, and achieve a good environment. The effect of degradability, economical and feasible preparation process and high degree of operation stability

Active Publication Date: 2008-12-17
CNSG ANHUI HONG SIFANG FERTILIZER IND CO LTD
View PDF11 Cites 100 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Although a lot of research has been done on polyurethane thermosetting resin coating materials, there are still some problems that have not been completely resolved in the process of use: the mixing degree of isocyanate components and polyol components on fertilizer particles is low, the coating The utilization rate of raw materials is low; due to the increase of the viscosity of the monomer raw materials during the transition from liquid to solid state, and because there is no anti-adhesive effect of the solvent, after the monomer raw materials are evenly coated on the granular fertilizer, they will be in the solidification process. There are macroscopic defects such as tearing, pinholes, and poor uniformity, which seriously affect the controlled release performance
The various measures mentioned in the Chinese patent applied by Nick P.Wynnyk et al. to adopt staged curing and minimize the contact in the fertilizer curing stage have greatly improved the integrity of the coating process, but the existing process is relatively complicated. However, it does not advocate sufficient mixing of polyurethane raw materials before reaching the fertilizer, thereby reducing the uniformity of the chemical composition of the coating material. Therefore, relying on the contact between fertilizers on the fertilizer particles makes the two types of polyurethane raw materials Mixing, the degree of mixing is limited, it is bound to affect the film performance of the final film
[0007] On the other hand, due to the high chemical stability of polyurethane materials, if such controlled-release fertilizers are widely used in field crops, the problem that must be solved is the biodegradability of the coating materials
Because if the membrane material that is difficult to degrade is used for a long time, the residual membrane material will inevitably bring serious environmental problems to the soil.

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
  • Degradable polymer filmcoated controlled release fertilizer, preparation thereof and special filmcoated material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] Weigh 10 kg of large granular urea with a particle diameter of 3 mm, place it in the drum, turn on the heating switch of the drum, and preheat the fertilizer until the temperature is constant at 85° C. Weigh 150 g of diphenylmethane diisocyanate (MDI), add 60 g of paraffin (film-forming agent), and place it in a heating kettle to melt and keep the temperature at 75°C. Weigh 210g of polyether polyol series (Type 635 of Jingzhou Longhua Petrochemical Company), 20g of 2,3-butanediol (chain extender), 20g of tannin (degradable functional monomer), and place in a heating kettle to melt at constant temperature 90°C. Then open the vent valve of the proportional pump, and then open the pump inlet valve, so that the two-component liquid is mixed through the high-efficiency mixer, adjust the pressure of the pump to 0.1Mpa, and the total spray rate is 0.15 liters / minute, and start spraying. After continuous spraying for 3 minutes, stop spraying, keep warm at 90° C., react for 8 m...

Embodiment 2

[0061]Weigh 10Kg of the 16-16-16 Russia Akon compound fertilizer, place it in the drum, turn on the heating switch of the drum, and preheat the fertilizer until the temperature is constant at 85°C. Weigh 100 g of hexamethylene diisocyanate (HDI), add 80 g of rosin ester (film-forming agent), and place it in a heating kettle to melt at a constant temperature of 75°C. Take by weighing castor oil 260g, 1,4-butanediol 20g (chain extender), regenerated cellulose 30g (degradable functional monomer), and add 0.1g diethylenetriamine (catalyst), place heating kettle The medium melting temperature is 80°C. Then open the air release valve of the proportional pump, and then open the pump inlet valve to mix the two-component liquids. After mixing by the high-efficiency mixer, adjust the pump pressure to 0.1MPa, and the total spray rate to 0.15 liters / minute, and start spraying. Spray continuously for 12 minutes each time, then keep warm for 4 minutes and continue spraying until the coatin...

Embodiment 3

[0063] Weigh 10Kg of 15-15-15 Sacofu compound fertilizer, put it in the drum, turn on the heating switch of the drum, and preheat the fertilizer until the temperature is constant at 85°C. Weigh 200 g of toluene diisocyanate (TDI), add 140 g of sulfonated paraffin (film-forming agent), and place it in a heating kettle to melt at a constant temperature of 70°C. Take polybutylene adipate 420g, 1,6-hexanediol (chain extender) 40g, chitosan (degradable functional monomer) 65g, and add 0.1g stannous octoate (catalyst), place Melt in a heating kettle at a constant temperature of 80°C. Then open the vent valve of the proportional pump, and then open the pump inlet valve to mix the two-component liquid through the high-efficiency mixer, adjust the pump pressure to 0.1MPa, and the total spray rate to 0.075 liters / minute, and start spraying. Continuous spraying for 6 minutes, until the coating solution is completely sprayed, stop spraying, keep warm at 90°C for 10 minutes, cool down, an...

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 sizeaaaaaaaaaa
Login to view more

Abstract

The invention discloses a polymer coated released fertilizer and a preparation method thereof and a special coating material thereof. The coating material comprises isocyanate, polyol, degradable functional monomer, an aid agent of coating and a chain extender, wherein, the mol ratio between the isocyano group in the isocyanate and the hydroxyl group in the polyol is 1:2 to 2:1 and the mass of the degradable functional monomer is 1 percent to 20 percent of the mass of the coating material. The coated released fertilizer provided by the invention consists of a core and a karyotheca, wherein, the core is granule fertilizer and the karyotheca is prepared from the coating material, and the mass of the karyotheca is 2 percent to 10 percent of the mass of the core. The coating material has good film forming and water resisting performance and can be degraded in nature. The hardness and the elasticity of the material can be adjusted by changing the mixure ratio of the coating material so as to prepare released fertilizers with different releasing periods.

Description

technical field [0001] The invention relates to a novel degradable polymer-coated controlled-release fertilizer, a preparation method and a special coating material. Background technique [0002] my country is a large agricultural country, and the proportion of chemical fertilizers in agricultural production investment accounts for about 50%, but the utilization rate of fertilizers in our country is only 30%, which causes a huge waste of economic energy and various environmental problems. Therefore, controlled-release fertilizers have become the development direction of agricultural fertilizers in the future, and polymer-coated fertilizers are called real controlled-release fertilizers by relevant experts. It uses polymer materials to form a film on the surface of fertilizers, controls the dissolution rate of fertilizers in the soil, and makes the dissolution rate consistent with the growth needs of plants, so as to save fertilizers, improve fertilizer utilization and increa...

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 Applications(China)
IPC IPC(8): C05G3/00
Inventor 胡树文陶树明张福锁任雪芹曹一平江荣风
Owner CNSG ANHUI HONG SIFANG FERTILIZER IND CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap