Synthesis of Biodegradable Mixing-Polymer as Coating Material for Controlled-Release Urea Fertilizer

The biodegradable mixing-polymer as low cost, environmentally friendly coating material for controlled-release urea fertilizer was synthesized by borax crosslinked phosphated distarch phosphate (PDSP)/polyvinyl alcohol (PVA) and polyacrylic acid (PAA) via pan coating method. The physico-chemical characteristics of biodegradable mixing-polymer were confirmed by FTIR, TGA and SEM techniques. The kinetics of urea release were also carefully investigated in water and soil. It’s been found that a uniform layer with better bonding structure was created on surface of the mixing-polymer PDSP/PVA-PAA and the time released 70% urea reached 6 hours in water and more than 27 days in soil.

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Synthesis and Characterization of Controlled-Release Urea Fertilizer from Superabsorbent Hydrogels

Indonesian Journal of Chemistry ◽

10.22146/ijc.44230 ◽

2020 ◽

Vol 20 (3) ◽

pp. 616

Author(s):

Salih Muharam ◽

Afria Fitri ◽

Lela Mukmilah Yuningsih ◽

Yulia Mariana Tessa Ayudia Putri ◽

Isnaini Rahmawati

Keyword(s):

Controlled Release ◽

Ph Control ◽

Superabsorbent Hydrogel ◽

Urea Fertilizer ◽

Urea Release ◽

Controlled Release Urea ◽

Carboxy Methyl ◽

Controlled Release Fertilizers ◽

Superabsorbent Hydrogels

It is very important to develop controlled-release fertilizers to ensure efficiency and environmental protection. This study aims to make a superabsorbent hydrogel-based controlled-release urea fertilizer. Superabsorbent hydrogels were prepared from the cellulose of corn cobs cross-linking with epichlorohydrin, and then an amount of urea as a fertilizer was stored inside the hydrogels (GEL-A). The GEL-A functionalization with carboxy-methyl was also carried out in this study to improve the hydrophilicity of hydrogels (GEL-B). GEL-A and GEL-B were immersed in water at a certain pH and temperature range and the urea concentration released from the hydrogels was monitored by a spectrophotometer. The results showed that the urea released by GEL-A and GEL-B was not much different. Respectively, the urea efficiency of GEL-A and GEL-Bwas around 5.29% and 5.56% for 180 min. The urea released from both hydrogels was not significantly affected by changes in the temperature of the solution. Urea release was influenced by pH, and the rate of urea release of GEL-B was faster than GEL-A, so pH control was needed in the application of this slow-release fertilizer.

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Optimization of Pan Coating Process for Increased Efficiency of Controlled-Release Urea Fertilizer

Materiale Plastice ◽

10.37358/mp.20.4.5433 ◽

2021 ◽

Vol 57 (4) ◽

pp. 333-342

Author(s):

Trung Huu Nguyen ◽

Tran Nguyen Minh An ◽

Mahboob Alam ◽

Duc Hoai Tran ◽

Nghi Tran ◽

...

Keyword(s):

Controlled Release ◽

Layer Thickness ◽

Release Time ◽

Coating Process ◽

Analysis Method ◽

Sauter Mean Diameter ◽

Urea Fertilizer ◽

The Relationship ◽

Central Composite ◽

Controlled Release Urea

The goal of the research is to develop an experimental mathematical model of pan coating process effect on the biodegradable polymer and to determine optimal process parameters. The polymer solution was conducted with phosphated di-starch phosphate, polyvinyl alcohol, and polyacrylic acid and performed as material coating for the controlled-release urea fertilizer. The image analysis method has been used to determine the particle size distribution, Sauter mean diameter of the particle and layer thickness that is novel. The central composite rotatable design has been selected to determine the regression models of the process, which described the relationship between two objective variables as layer thickness, release time with angle of pan, spray flow, and coating time. The statistical analysis results indicate the fitness of model.

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Controlled-Release Material for Urea Fertilizer from Polylactic Acid

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.55-57.897 ◽

2008 ◽

Vol 55-57 ◽

pp. 897-900 ◽

Cited By ~ 5

Author(s):

J. Papangkorn ◽

C. Isaraphan ◽

S. Phinhongthong ◽

Mantana Opaprakasit ◽

Pakorn Opaprakasit

Keyword(s):

Controlled Release ◽

Polylactic Acid ◽

Urea Fertilizer ◽

Technique Effect ◽

Preparation Conditions ◽

Micron Size ◽

Coated Urea ◽

Urea Release ◽

Uv Visible ◽

Controlled Release System

Urea fertilizer is a major source of nitrogen, which is one of the essential nutrients for plant growth. Due to its uncontrollable release, this chemical can be wasted easily by leaching and volatilization that can adversely cause the contamination to the environment. In this work, a controlled-release material for urea fertilizer has been prepared by using degradable polylactic acid. Unlike other conventional controlled-release system, the resulting material is able to provide an efficient supply of urea fertilizer, without causing further contamination to the environment from residue material, as polylactic acid can be degraded in the environment. Micron-size particles of polylactic acid coated urea were prepared by employing atomizing technique. Effect of the preparation conditions; urea/PLA composition, PLA concentration, and pressure of atomizing gun on the particle size of material are investigated. The urea release rate of these samples is then studied by employing UV-Visible spectrophotometer. In addition, the effect of preparation conditions on shape and morphology of sample is determined by using Scanning Electron Microscope (SEM).

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