6 Post - Santiago Rubio Robin Kirkman Experiment 6 Printing...

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Santiago Rubio Robin Kirkman Experiment 6: Printing with Azoic Dyes September 30, 2010 II. Part 2 A. Observations: 1. The fabric became a lime green color after the naphthol solution was padded. The naphthol was the coupling component and sodium nitrite was also padded. 2. The fabric moved in the padder at a speed of 1.6 m/min. 3. We padded the fabric to an 85% WPU. 4. The print paste that was already created had an orange color. It was stirred until it had a viscosity of 66,000 cps. This paste had the “diazonium salt” which was needed as part of the reaction. The paste didn’t become a diazonium salt until it came in contact with the sodium nitrite on the fabric. 5. When it was time to print, the orange paste became red when it made contact with the naphthol on the fabric. 6. We then dried the printed fabric to destroy any unreacted diazonium salt. The oven was set at 109 o C and ran for 60 seconds. 7. After this drying process the fabric was still the lime green color with the red logo in the middle.
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