title: Application of Nano FeIII-Tannic Acid Complexes in Modifying Aqueous Acrylic Latex for Controlled-Release Coated Urea.
abstract: Acrylic latexes are valuable waterborne materials used in controlled-release fertilizers. Controlled-release urea coated with these latexes releases a large amount of nutrients, making it difficult to meet the requirement of plants. Herein, FeIII-tannic acid (TA) complexes were blended with acrylic latex and subsequently reassembled on a surface of polyacrylate particles. These complexes remarkably retarded the release of urea (the preliminary solubility was decreased from 22.3 to 0.8%) via decreasing the coating tackiness (Tgwas increased from 4.17 to 6.42 °C), increasing the coating strength (tensile stress was improved from 3.88 to 4.45 MPa), and promoting the formation of denser structures (surface tension was decreased from 37.37 to 35.94 mN/m). Overall, our findings showed that a simple blending of FeIII-TA complexes with acrylic latex produces excellent coatings that delay the release of urea, which demonstrates great potential for use in controlled-release fertilizers coated with waterborne polymers.
authors.affiliation: State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences , 71 East Beijing Road, Nanjing 210008, China.
authors.forename: Yazhen
authors.initials: Y
authors.lastname: Shen
authors.affiliation: State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences , 71 East Beijing Road, Nanjing 210008, China.
authors.forename: Changwen
authors.identifier: http://orcid.org/0000-0002-9064-3581
authors.initials: C
authors.lastname: Du
authors.affiliation: State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences , 71 East Beijing Road, Nanjing 210008, China.
authors.forename: Jianmin
authors.initials: J
authors.lastname: Zhou
authors.affiliation: State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences , 71 East Beijing Road, Nanjing 210008, China.
authors.forename: Fei
authors.initials: F
authors.lastname: Ma
mesh_terms: D003692:Delayed-Action Preparations / Q000737:chemistry*; D004339:Drug Compounding / Q000295:instrumentation / Q000379:methods*; D005290:Ferric Compounds / Q000737:chemistry*; D005308:Fertilizers / Q000032:analysis*; D007840:Latex / Q000737:chemistry*; D013634:Tannins / Q000737:chemistry*; D014508:Urea / Q000737:chemistry*
chemical_list: D003692:Delayed-Action Preparations; D005290:Ferric Compounds; D005308:Fertilizers; D007840:Latex; D013634:Tannins; D014508:Urea
keywords: aqueous polymeric coating; composite material; controlled-release fertilizer; coordination complex; self-assembly