Hydrophobically modified water-based polymer for slow-release urea formulation

Chen, Songling; Han, Yanyu; Han, Yachun; Zhu, Xiaoqing; Liu, Chutong; Liu, Hongdou; Zou, Hongtao

doi:10.1016/j.porgcoat.2020.105964

Cited by 16 publications

(13 citation statements)

References 52 publications

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“…Currently, a variety of modification techniques including physical blending, chemical grafting, and nanoparticle addition are used to improve the performance of BCRFs. − Due to the small size, high surface activity, and great specific surface area, nanomaterials can produce a strong interfacial interaction with polymers, which gives new or improved properties to polymers, such as high hydrophobicity and mechanical performance. − Therefore, the nanocomposite modification technology has become one of the important research directions. Li prepared a polyurethane (PU)/zeolite 4A composite via an in situ reaction on the surface of urea granules.…”

Section: Introductionmentioning

confidence: 99%

Understanding the Role of a Silane-Coupling Agent in Bio-Based Polyurethane Nanocomposite-Coated Fertilizers

et al. 2021

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Bio-based polyurethane (PU)-coated controlled release fertilizers are attracting a lot of attention; however, generally they have poor properties, so it is difficult for them to meet the agricultural needs. Herein, γ-aminopropyl triethoxy silane (KH550) was first used with nanosilica (NS) to prepare bio-based PU nanocomposite-coated urea (KSPCU). The coating microstructures and nutrient controlled release behaviors of KSPCU were investigated and compared with those of unmodified NS containing PU nanocomposite-coated urea (SPCU) and bio-based PU-coated urea (PCU). The KSPCU with KH550 exhibited an excellent controlled release performance. Its nutrient release longevity exceeded 105 d, which was nearly 6 times greater than that of PCU and 2 times more than that of SPCU, and it was much longer than that of PCU reported in previous research at a coating rate of 3 wt %. A series of characterization methods combined with water resistance capacity and porosity measurements confirmed that a hydrogen bond was formed by the reaction between the nanoparticle and PM200, the nanoparticle was bonded on the macromolecular chain, and KH550 in the coating increased the cross-linking degree, which were beneficial to slowing down the nutrient release of the KSPCU. The innovative application of KH550 on bio-based PU-coated fertilizers will provide a new coating technology for improving their controlled release property.

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Section: Introductionmentioning

confidence: 99%

Understanding the Role of a Silane-Coupling Agent in Bio-Based Polyurethane Nanocomposite-Coated Fertilizers

et al. 2021

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“…The nutrient release mechanism initiates when water molecules from the bulk solution accumulate on the CRF surface and enter the system by diffusion (I: water adsorption), followed by water diffusion through the coating (or matrix) associating with the same processes that intervene in the nutrient release process mentioned previously. , Then, the coating (or matrix) swells allowing a dynamic water exchange through the pores (II: coating swelling). If the system resists the developed osmotic pressure, the nutrient is solubilized until it diffuses to the exterior (III: water diffusion), or else a failure mechanism might be observed, in which the nutrient is spontaneously released due to the breakdown in the system (IV: coating disruption). , Fertilizer dissolution in water is affected by the hydrophobicity of each biobased polymer.…”

Section: Nutrient Release Kinetics and Biodegradability In Crfsmentioning

confidence: 99%

Production, Mechanisms, and Performance of Controlled-Release Fertilizers Encapsulated with Biodegradable-Based Coatings

Gutiérrez

Ledezma-Delgadillo²,

Juárez-Luna

et al. 2022

ACS Agric. Sci. Technol.

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It is estimated that up to 50% of conventional fertilizers are lost once applied to agricultural soils (i.e., due to leaching and/or evaporation) or remain in the matrix due to poor nutrient use efficiency (NUE) by the crops. Controlled-release fertilizers (CRFs) might overcome both issues, and the use of extracted biobased polymers (or biodegradable materials) from organic waste (e.g., food losses or agrowaste) as coating agents is an ecological alternative aligned within the concept of a circular economy. This review is divided into two main sections: (i) sustainable CRF production (i.e., organic residues, value-added polymers used as capping agents, encapsulation methods) and (ii) a description of the nutrient release mechanism (i.e., a brief overview of nutrient release models applied to CRFs, and to the biodegradation process). The information provided in this manuscript will be relevant to guide future research in the field with the aim of promoting a sustainable approach in the use of fertilizers as well as other agrochemicals in agriculture.

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“…Perfluorosiloxane is a generally utilized hydrophobization modifier, which can significantly reduce the surface free energy of the structure after being grafted with perfluoroalkyl groups. 16,17 At the same time, with the help of the efficient solvent diffusion inside gels, the interior and surface of the solid network composed of ANFs/PVA have the opportunity to achieve hydrophobic modification. Finally, through supercritical carbon dioxide drying, robust hydrophobic ANFs/PVA/ PFOTES composite aerogels can be obtained.…”

Section: Introductionmentioning

confidence: 99%

Robust hydrophobic modification of para‐aramid nanofibers/polyvinyl alcohol composite aerogels with 1H,1H,2H,2H‐perfluorooctyltriethoxysilane

Ren

Hasuo

Tabata

et al. 2022

J of Applied Polymer Sci

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Aerogels are frequently exposed to moisture or come into direct contact with water in real-world applications, posing a threat to their stable performance. Herein, based on the characteristic that the liquid phase can efficiently diffuse in the solid cross-linked network of gels, a robust hydrophobic modification approach for paraaramid nanofibers/polyvinyl alcohol (ANFs/PVA) composite aerogels with 1H,1H,2H,2H-perfluorooctyltriethoxysilane (PFOTES) is demonstrated. The type of solvent, the concentration of hydrochloric acid (HCl) required promoting PFOTES hydrolysis, and the treatment time for hydrophobic modification are discussed individually. The ANFs/PVA/PFOTES aerogels with a water contact angle of 131.0 were obtained through supercritical fluid drying employing acetone as the solvent, with a concentration of 0.1 mol/L HCl of 0.35 vol%, and a treatment duration of 2 h. The hydrogen bond between ANFs and PVA, and the grafting of PFOTES on PVA have both been verified by Fourier-transform infrared spectroscopy. The porous structure of the modified aerogels was improved simultaneously, according to scanning electron microscope and Brunauer-Emmett-Teller characterizations.With the help of a thermal imaging camera, ANFs/PVA/PFOTES aerogels exhibit stable thermal insulation capability in low temperature and humid environments, which holds great promise for a wide range of applications.

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Hydrophobically modified water-based polymer for slow-release urea formulation

Cited by 16 publications

References 52 publications

Understanding the Role of a Silane-Coupling Agent in Bio-Based Polyurethane Nanocomposite-Coated Fertilizers

Understanding the Role of a Silane-Coupling Agent in Bio-Based Polyurethane Nanocomposite-Coated Fertilizers

Production, Mechanisms, and Performance of Controlled-Release Fertilizers Encapsulated with Biodegradable-Based Coatings

Robust hydrophobic modification of para‐aramid nanofibers/polyvinyl alcohol composite aerogels with 1H,1H,2H,2H‐perfluorooctyltriethoxysilane

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