Self-emulsifiable soybean oil phosphate ester polyols for low-VOC corrosion resistant coatings |
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Authors: | Yinzhong Guo Vijay M Mannari Pulin Patel John L Massingill |
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Affiliation: | (1) Institute for Environmental and Industrial Science, Texas State University, 78666 San Marcos, TX;(2) Present address: Polytechnic University at Brooklyn, 11201 Brooklyn, NY;(3) Present address: Coatings Research Institute, Eastern Michigan University, 48917 Ypsilanti, MI |
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Abstract: | A series of soybean oil phosphate ester polyols (SOPEP) was prepared by reaction of fully epoxidized soybean oil with phosphoric
acid and simultanoeous hydrolysis in the presence of a polar solvent. The polyols were characterized by determination of acid
value, oxirane number, hydroxyl value, molecular weight (GPC), and FTIR spectra. These polyols with varying amounts of acid
phosphate groups could be self-emulsified to form aqueous dispersions after neutralization with organic base. These aqueous
dispersion showed varying degrees of stability and their appearance ranged from opaque dispersions to translucent to clear
solutions. Waterborne coating compositions were prepared using these aqueous dispersions as principal components and their
thermally cured film properties were studied. it was found that by careful selection and formulation, SOPEPs can be successfully
used for low-VOC waterborne coating formulations. SOPEPs with 3.5% phosphate ester content showed visibly superior corrosion
resistance properties. |
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Keywords: | Soybean oil phosphate ester polyols self-emulsified aqueous dispersion corrosion resistance VOC corrosion testing hardness scratch resistance solvent resistance alkyds oils (castor) linseed styrenated sunflower waterborne adhesion corrosion weath erability container enamel high-solids water-based VOC control epoxy esters oxygenated VOC aluminum iron cast iron steel |
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