Method for VOC Classification Based on Analysis of Paint Films Max T. Wills and Dane Jones Department of Chemistry and Biochemistry Cal Poly State University.

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Presentation transcript:

Method for VOC Classification Based on Analysis of Paint Films Max T. Wills and Dane Jones Department of Chemistry and Biochemistry Cal Poly State University San Luis Obispo, CA

Summary of Proposed Method A known quantity of the target substance is added to a formulated coating representative of the type of coating for which the substance is designed. Solids determinations are done at 110 o C for times ranging from one to twenty-four hours. The films remaining after solids determination are placed in sealed vials and solvent is added to extract any remaining target substance. Internal standard is added and the solution is analyzed using ASTM D6886 or AQMD Method 313

Example paint preparation A new coalescent to be tested is added at 5% by weight to a near-zero VOC coating known not to contain the new product The coating sample with the target substance is analyzed using ASTM D6886 or AQMD Method 313 The amount of the target substance in the coating is verified by comparing to the known formulated value. The relative response factor of the target substance should have been determined previously.

Solids samples preparation Twelve samples are prepared according to ASTM Method D2369 for solids determination. All twelve samples are placed in an oven at 110 o C. After one hour, three samples are removed and weighed. Three more samples are withdrawn after two hours, eight hours and twenty-four hours. The fraction solids is determined for each sample.

Extraction of films Immediately after the triplicate determination of the solids content of the coating at a particular temperature, cut the aluminum pans containing the coatings solid films into several small pieces or peel the coating off the pans. Place in a 40 mL vial and seal with a Teflon-faced septum cap Weigh approximately g of the film (or pieces of pan with film) in a headspace vial containing ceramic beads. Weigh 3-5 mL of appropriate extraction solvent (acetone, THF. Methanol, etc.) containing 1 mg/mL EGDE internal standard to the vial and seal. Sonicate, shake or otherwise mix the contents for one hour (this time may need to be modified).

Analysis of extracted films The solution used to extract possible remaining target substance is chromatographed using either ASTM D6886 or AQMD Method 313. The fraction target substance remaining in the film is calculated based on chromatographic data. This fraction can be converted to fraction of target substance in original coating remaining in film.

Analysis of data from different heating times Results from chromatographic data obtained from films heating at 110 o C for different times can be plotted versus time of heating. Plots for different semi-volatile materials can be compared. A determination of what is or is not to be considered a VOC can be made based on these plots. It may be necessary to adjust the heating temperature or times to obtain appropriate data.