Examination of Dye-Fiber Reactions in SC-CO2

Presentation Transcript

Examination of Dye-Fiber Reactions in SC-CO 2 NSF Green Processing Summer Research Experience for Undergraduates Faculty Mentors: Dr. David Hinks and Dr. Gerardo Montero Graduate Student Mentor: Mr. Ahmed El-Shafei North Carolina State University, College of Textiles Undergraduate Student: Nneka C. Ubaka-Adams Bennett College and North Carolina Agricultural and Technical State University

Objectives To exhibit and evaluate color fiber covalent security arrangement between chose colors and nylon, fleece and cotton strands in a supercritical carbon dioxide medium To enhance response conditions (temperature, weight and time) To direct a writing audit

Background Conventional color fiber responses utilize water as a vehicle medium, and result in: Low response effectiveness because of the contending hydrolysis response with hydroxyl particles in water (hydrolyzed color can't respond w/fiber) Environmental issues because of remaining, unreacted/hydrolyzed color present in gushing Replacing water with supercritical liquids (SCF) as a vehicle medium can bring about: Eliminating lethal waste (no hydrolyzed by-item) Lower costs for the whole coloring process

Conventional fluid based color fiber response Polyamide (nylon 6.6.)

Dye-Fiber Reaction in SC CO 2 Polyamide (nylon 6.6.) no hydrolyzed by-items

Sulfonyl-azo-colors

Dyeing Procedure Add fiber and color to vessel Pressurize framework (with CO 2 ) up to 800 psi and mix at around 850 rpm Heat to required temperature (100 - 180 ºC) Pressurize to 3500 psi; hold for 2 hours Release weight, evacuate texture

Testing Dye-Fiber Reaction Measure shading quality (K/S) of each colored fiber Wash fiber with CH3)2CO (expel surface color) Conduct soxhlet extraction utilizing ethyl acetic acid derivation (to evacuate unreacted color) Compare impact of vinylsulfone receptive gathering on color obsession

Results

Results

Comparison of Dyed Fabrics

Initial Conclusions Color profundity enhanced with expanding temperature Strong proof for color fiber security development utilizing vinylsulfone-construct color in light of nylon and fleece ES-coloring on fleece filaments demonstrated to a great degree low shading yields after extraction (no response) 94% obsession at 180 o C/3500 psi on fleece

Acknowledgments This exploration was led with the support of the NSF Green Processing Undergraduate Research Program with a give from the National Science Foundation, Award Number, EEC-9912339.