Determination of Bronopol Biocide Content in Latex for Waterborne Architectural Coatings and Study on Bronopol Stability
In this article,we establish the high performance liquid chromatograph(HPLC)method for determination of bronopol biocide content in polymer latex for waterborne architectural coatings.The samples were extracted with methanol-water,purified by centrifugation and filtration.The bronopol was separated on a C18 column with methanol-water solution as mobile phase under gradient elution detected with a diode array detector(DAD).The pre-treatment factors such as extraction solvent,extraction method and extraction time were optimized.Under the optimized conditions,the bronopol had good linearities(r2≥0.999 9)in the range of 1～20 μg/mL.The recoveries were between 85.48%and 95.92%.The relative standard deviations were not more than 3%.The limit of detection was 2.2 mg/kg.The measurement range was 2.2～223.7 mg/kg.The results showed that the method had the advantages of high sensitivity,good repeatability and high recovery.The analyses of real architectural coatings latex sample verified the reliability of this method.We studied the effect of different pH value conditions and storage time on the stability of bronopol in latex.The results showed that with the increase of pH value and storage time,bronopol decomposed,and formaldehyde was released.
high performance liquid chromatographemulsion for architectural coatingsbronopolstabilityformaldehyde
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