Aqueous polyacrylate/poly(silicone‐co‐acrylate) emulsion coated fertilizers for slow nutrient‐release application

Abstract

Waterborne polyacrylate/poly(silicone-co-acrylate) emulsions were synthesized to develop coated fertilizers. The effects of the n-butyl acrylate (BA)/methyl methacrylate (MMA) ratio, vinyltriethoxysilane, and synthesis method on the water resistance, glasstransition temperature, mechanical properties, and nutrient-release profiles were investigated. The results show that miniemulsion polymerization with a BA/MMA ratio of 55:45 was the most suitable for slow nutrient-release applications. Under these conditions, the preliminary solubility rate of the nutrient was about 3%, and the 30-day cumulative nutrient release was 15% at 25

The Facile Modification of Polyacrylate Emulsion via Hexadecane to Enhance Controlled-release Profiles of Coated Urea

“…In our previous studies, an aziridine crosslinker and Fe III -tannic acid complexes were used to modify aqueous polyacrylate, and the resultant release profiles of coated urea exhibited satisfactory improvement 19 , 20 . Additionally, miniemulsion polymerization (MP) has been proved beneficial over conventional emulsion polymerization (CEP) in retarding nutrient release 21 , 22 . MP involves the use of a highly hydrophobic co-stabilizer, appropriate surfactant, and homogenization devices to produce nanometer-sized monomer droplets 21 .…”

“…Although MP has been proved beneficial over CEP in retarding nutrient release, it is not clear whether it is the miniemulsion polymerization technique or the co-stabilizer that causes slow nutrient release. Besides, an inefficient homogenization device (Ultrasonifier), instead of an efficient homogenization device (high pressure homogenizer), was used to produce miniemulsions by Shen 22 . The first goal of this study was to explore the intrinsic reason for retarding nutrient release of polyacrylate-coated fertilizer.…”

Thermal post-treatment alters nutrient release from a controlled-release fertilizer coated with a waterborne polymer

“…3A,B ). Membrane hydrophobicity was a key factor affecting the nutrient-release pattern from the CRF, and it was generally acknowledged that waterborne polymer coated CRF with higher membrane hydrophobicity had a longer controlled period of nutrient-release 19 24 . The hydrophilic groups, such as the –OH and –NH, and the hydrogen bond acceptors, such as the carbonyl of ester, facilitated moisture uptake.…”

Development of a Polyacrylate/Silica Nanoparticle Hybrid Emulsion for Delaying Nutrient Release in Coated Controlled-Release Urea

“…The polyacrylate emulsion was prepared by a semi-continuous conventional emulsion polymerization procedure [8]. The polyacrylate had a mass ratio of BA:MMA:MAA = 55:45:2.5 and the solid content of 40 wt.%.…”

“…With growing interest in environmental protection, more attention has been paid to polymer emulsion coated urea. Polyacrylate emulsion has appropriate viscosity, good film-forming properties, and low price [7,8]. It affects neither the structure of soil nor the activities of soil microorganisms [9].…”