Objective: Use the process of dying fabrics to illustrate chemical reactions, equilibrium, chemical bonding, and ph.
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1 Tie Dye Chemistry
2 Objective: Use the process of dying fabrics to illustrate chemical reactions, equilibrium, chemical bonding, and ph.
3 Tie Dye Chemistry Lab Resources Video LINK #1 - Chem of Natural Dyes Video LINK #2 - Chem of Dyeing Fibers Resource LINK 1: Chemistry of Dyes History of Dying Materials: LINK 2 *Research a design for your tie dying technique. Try youtube for instructions.
4 Pre-lab Questions: 1.) Where did the art of dying fibers originate? 2.) Originally, what type of substances were used to dye? 3.) What are the fibers of the shirt made of? 4.) What chemical interaction is occurring when fibers are dyed?
5 Student Examples
6 History of Dyeing Fabrics: The art of dyeing clothing fibers originated in India or China no later than 2500 B.C. Most natural dyes came from parts of plants such as the bark, berries, flowers, leaves, and roots. In 1856, William Henry Perkin began the synthetic organic chemical industry by accidentally discovering the purple dye, mauveine, when he tried to produce quinine from aniline. About 100 years after Perkin s first discovery, fiber-reactive dyes capable of forming covalent linkages with the fiber were discovered.
7 Chemistry of Dyeing Fabrics: Some dyes only stain the cloth, and wash out a little each time the cloth is laundered. High Quality dyes (fiber-active dyes) actually chemically (covalent) bond to the molecules of the fabric and can never be washed out. The dye molecules carry a chromophore, which absorb varying spectrums of light, allowing only certain spectrums to reflect.
8 Chemistry of Dyeing Fabrics:
9 Chemistry of Dyeing Fabrics: Cotton is made of long strands of cellulose molecules, all twisted together. Cotton is ideal for dying because the fibers are naturally hollow, and the dye molecules will form bonds on both the inside and outside of the fiber. If you put molecules of dye and cotton together, very little will happen until the atoms on the surfaces of the molecules are prepared for bonding.
10 Chemistry of Dyeing Fabrics: This can be done by either increasing the temperature or the ph of the fiber and dye. In this lab, we will do the latter, increasing the ph by soaking the fabric in calcium carbonate, which causes the releases a H atom from the cellulose molecule. The removal of the H atom leaves the cellulose molecule with some atoms that do not have stable octets. As a result, the dye can bond to the cellulose molecule at the site of the removed H atom.
11 Chemistry of Dyeing Fabrics: After the dye is applied, it is allowed to react in a desirable host environment for up to 24 hours. After this time, the bonding sites on the cellulose should be saturated with dye molecules. Excess dye molecules that have not bonded permanently are washed away using warm water rinse and a dye-carrying detergent.
12 What Design Will You Use? *Research*
13 Lab Safety Rules: 1.) Always wear safety glasses in the lab. 2.) Wear disposable plastic gloves and aprons. 3.) Don't get sloppy or squirt others with the dye solutions. 4.) Use caution handling the solutions. These are strong chemicals that can be harmful
14 Procedure: The point of tie dying is to prevent the dye from reaching the fabric evenly. Any place the dye can t reach will stay white, or a lighter color. You can accomplish this by folding the fabric, tying it with string, using rubber bands Step 1: With a permanent marker, write your name on the cloth you will be tie dying. There will be many other shirts in the lab during this activity; be sure yours is marked to avoid losing it. Step 2: Soak your cloth in the hot water for about 5 minutes. Be sure you put it in the tub marked for your period.
15 Step 3: Put on a pair of gloves, remove your cloth from the soaking tub and wring out. Using the below diagrams, tie you cloth in one (or a combination of) the methods shown using string or rubber bands. Step 4: Dye application. Apply the dye using the applicator bottles. Be aware that mixing will occur where the dyes come in contact with each other. Using complimentary colors (purple and yellows, blues and orange, or red and green) near each other usually produces a brownish black color. Also, the more dye you put on a given spot, the less white will remain on the final product.
16 Step 5: Place your dye-soaked item in a grocery or other plastic bag marked clearly with your name. No pooling of liquid should appear in the bag. Step 6: After the cloth rests for at least 24 hours, open the bag, remove the item, and rinse it several times with warm water, before removing strings or rubber bands. Once it is rinsing clean, remove the ties and rinse several times again until it is rinsing clean. At this point, you can hang it to dry or place it in another bag to take home and wash.
17 After the shirt is dyed: Step 7: The first time you wash it, place it alone in the washing machine with just a small squirt of dishwashing liquid like Dawn or Joy. Do not use laundry detergent.
18 Data: 1.) Write down a synopsis of what occurred before the dyeing of the shirt. 2.) Explain the process used to dye your shirt - pattern, tying method. 3.) After the shirt sat for 24 hours, describe the pattern of the shirt - picture, if possible.
19 Post Lab Questions: 1.) If you dyed a rainbow spiral on a shirt and then soaked it in a black dye bath, the result would be a black shirt with a rainbow spiral pattern. Why doesn t the entire shirt dye black? 2. What is the purpose of soaking the shirts in the hot water for 5 minutes? 3. Why is 100% cotton the best type of cloth to use with fiber reactive dyes?
20 Post Lab Questions: 4. What are some advantages of fiber reactive dyes? 5. Explain how ionic bonding is used to dye the shirts in this lab.
21 Lab Report Requirements: 1.) Create a blog or google doc of the info presented in this powerpoint. 2.) Include pictures of each step and one of your final design. 3.) Be sure to answer all questions in complete sentences (TAG if you must): pre-lab and post lab.
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