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Prediction of Release Characteristics of Film‐Coated Urea from Structure Characterization Data of the Film
Author(s) -
Lan R.,
Wang G.,
Yang L.,
Wang T.J.,
Kan C.,
Jin Y.
Publication year - 2013
Publication title -
chemical engineering and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.403
H-Index - 81
eISSN - 1521-4125
pISSN - 0930-7516
DOI - 10.1002/ceat.201200459
Subject(s) - materials science , coating , permeability (electromagnetism) , urea , film coating , penetration (warfare) , composite material , randomness , film plane , chemical engineering , chemistry , engineering , organic chemistry , physics , biochemistry , operations research , membrane , statistics , mathematics , magnetic anisotropy , magnetization , quantum mechanics , magnetic field
An efficient method for the prediction of the release characteristics of film‐coated urea from its film structure is proposed. A model spray‐coating apparatus was built to prepare a plane film to directly measure the film permeability coefficients by simulating the characteristics of randomness, intermittence and multiple layers of the coating, and eliminating particle collision effects. From analysis, the spray‐coated film structure can be modeled as comprising a dense structure and a defect structure. Both structures contributed to the penetration flux and the apparent permeability coefficients of the film for water and urea diffusion. The permeability coefficients of the plane films were calculated from the film structure model, and were shown to be close to the measured values.