4Pre - mercerized cotton (SBM) D. 1. Before coming to the...

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Santiago Rubio Robin Kirkman Experiment 4: Direct Dyes: Influence of Salt and mercerization in a Jet Dyeing September 16, 2010 I. Part 1 A. The process being performed in this experiment is the dyeing of cotton with direct dyes. B. One of the major chemicals being used is Direct Red 24 which is the dye that will be placed on the fabric. The second chemical is Sodium Sulfate solution made from Na 2 SO 4 (this is known as Glauber’s Salt) which increases the rate at which the direct dye is absorbed by the fabric. The Glauber’s salt removes negative charges on the fabric and also makes the dye slightly less soluble in the dye bath. This helps increase exhaustion. C. The substrates being treated in this experiment are the multifiber strips (43A). There is also a rope of woven scoured and bleached cotton (SB) and scoured, bleached, and
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Unformatted text preview: mercerized cotton (SBM) D. 1. Before coming to the lab calculate the amount of dye required to dye 77g of cotton at 1% owf. Also calculate the amount of sodium sulphate needed in the 1.8 L bath. 2. The first step is to place the multifiber rope in the JFL dyeing machine with 1.5 L of water. 3. Calbirate the JFL machine and run it. 4. After 5 min, the temperature of the bath needs to be recorded. Calculate the temperature every 5 min until it reaches 90 o C. 5. After it reaches 90 o C we add the salt, and we continue dying for 30 min. 6. Cool the bath to 80 o C and set the machine for a 50 o C rinse. 7. Empty the bath, remove fabric, and dry it in oven. 8. Evaluate the multifiber strips in the light box....
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