Determination PVDF Resin Content in Fluorocarbon Resin Coatings Base on the Combination of Scanning Electron Microscopy-Energy Dispersive Spectroscopy and Infrared Spectroscopy
A method for identifying fluorine elements in hot-melt fluorocarbon resin(PVDF)coatings by scanning electron microscopy-energy dispersive spectroscopy(SEM-EDS)and quantitative determination of PVDF(polyvinylidene fluoride)resin content in resin by infrared spectroscopy(IR)was established.In EDS,the X-ray analysis line Kα of fluorine element is 0.677 KeV,while the Kα of oxygen element was 0.525 KeV,so oxygen didn't interfere with the identification of fluorine,and other elements in the periodic table didn't interfere with the determination of fluorine also.The resin of fluorocarbon resin paint was composed of acrylic resin and PVDF resin,and the IR characteristic peak(carbonyl)of acrylic resin was 1724 cm-1,and the IR characteristic peak of PVDF was 874 cm-1.The linear regression equation was obtained based on the relationship between the absorbance ratio of these two characteristic peaks and the PVDF content,and the equation was Y(absorbance ratio)=-0.0274 X(PVDF content)+2.499,R2=0.9932.Due to the different carbonyl content of different acrylic resins,the quantitative results were modified using the IR method.In this paper,the clear topcoat,colored primer and colored topcoat of fluorocarbon resin were used as examples,and the results showed that the relative error between the quantitative value and the standard method measurement value was less than 2％.This combination method was suitable for the detection of powdered and liquid fluorocarbon resin coatings.
scanning electron microscopyenergy dispersive spectroscopyinfrared spectroscopyPVDF resin
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维普
