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6 Pre - acid C The substrate treated is bleached cotton...

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Santiago Rubio Robin Kirkman Experiment 6: Printing with Azoic Dyes September 30, 2010 I. Part 1 A. The process being performed is the printing of bleached cotton with an azoic dye. B. The chemicals being used include sodium carbonate which will control the pH of the bath used to remove the thickener and uncoupled naphthol. Renex 36, the wetting agent will also be used in that bath. Naphthol will be used as the coupling component on the cotton fabric. Fast Scarlet RC Base is the azoic diazo componemt of the print paste. Solvitise C-5 will be used as a starch thickener in the paste. The pad bath will include Naphthol AS-D, sulfonated castor oil which is a wetting agent, caustic soda and sodium nitrite. Lactic acid will also be in the paste to react with sodium nitrite and create nitrous
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Unformatted text preview: acid. C. The substrate treated is bleached cotton print cloths. D. Procedure: 1. The first step is to run the fabric in the pad bath already prepared. The pad bath includes 20g/L of Naphthol, 20 mL/L of sulfonated castor oil, 12.7 g/L of NaOH, and 22.5 g/L of sodium nitrite. 2. We will then dry it at 110 o C. 3. We then measure the viscosity of the already prepared print paste. 4. Next we will cut swatches for each person. 5. We will then use the paste to print the image on the cloth and dry the fabric in the oven. 6. After the paste is dried we will wash the fabric in cold water and then in a bath of sodium carbonate and wetting agent to remove the paste thickener. We then run it through the centrifuge machine. 7. The fabric is then dried....
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