Nonaqueous Dry Dyeing of Aramid Spun Yarn with Disperse Dyes Under Supercritical Solvent Medium

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1 24 KIChE Spring Meeting Nonaqueous Dry Dyeing of Aramid Spun Yarn with Disperse Dyes Under Supercritical Solvent Medium Gongju National University, Gongju City, Korea 9:2~: Gwan Soo Kim, Han Seok Kim, Sun Young Kim and Ki-Pung Yoo Thermodynamics and Green Processing Laboratory, Department of Chemical Engineering Sogang University, Seoul, KOREA

2 Introduction Objectives Relationship between properties of disperse dyes and supercritical fluid Finding of optimal dyeing condition Development of new dyeing technique for non-dyeable fiber Investigation of fiber properties in supercritical fluid

3 Introduction Comparison of conventional wet dyeing & SFD Conventional Wet Dyeing Process Dye Water Additives Water R/C Agent Air Energy Textile Dyeing R/C Drying Product Colored Wastewater SCF Dyeing Process Dye SCF Wastewater Heat, Air Pollutants Textile SCF Dyeing Product

4 Introduction Principle of SFD Process Pressure Dissolve dyestuff Dyeing Recycle of CO 2 Recover residue of dyestuff Temperature

5 Experimental Schematic diagram of SFD apparatus CO 2 Cylinder Dyeing Vessel Dye Dissolver Flowmeter Circulation Pump Gas Booster Fiber Carrier

6 Experimental Properties of Disperse dyes (E type) Dyestuff (E type) Formula Particle Size (PSA) Tm (DSC) OH O CI Disperse Yellow 4 N 63 µm 27 O O NH 2 O CI Disperse Red 6 µm 87 O OH OH O NH 2 CI Disperse Blue 6 Br 42 µm 99 NH 2 O OH

7 Experimental Experimental condition Temperature 9, 2, 3, Pressure MPa, 2 MPa, 3 MPa % owf owf, owf, owf, owf, 2 owf, 3 owf owf : on the weight of fiber

8 Experimental Measurement of K/S value CCM (SF6, Datacolor, USA) K/S = (-R) 2 2R Where, K : the coefficient of absorption of the dye S : the coefficient of scattering R : the reflecatance

9 Results and discussion Dyeability with temperature and pressure CI Disperse RED K/S 4 K/S Temperature( ) 2 3 Pressure(MPa) Dyeing condition : 3MPa, 6min, CIDisperse Red 6, % owf Dyeing condition :, 6 min, CIDisperse Red 6, % owf

10 Results and discussion Dyeability, solubility with temperature and pressure Condition : 3MPa, 6min, CIDisperse Red 6, % owf K/S, Solubility(e-4mol/mol) K/S, Solubility(e-4 mol/mol) Temperature( ) 2 3 Pressure(MPa)

11 Results and discussion Adsorption isotherm of dyestuff for Aramid 2 CIDisperse Red 6 3MPa 3 2MPa Wet Dyeing 8 K/S Concentration of the dye(% owf )

12 Results and discussion Adsorption isotherm of dyestuff for Aramid CIDisperse Blue MPa 3 2MPa Wet Dyeing K/S Concentration of the dye(% owf)

13 Results and discussion Adsorption isotherm of dyestuff for Aramid 2 2 CIDisperse Yellow 4 3MPa 3 2MPa Wet Dyeing K/S Concentration of the dye(% owf)

14 Results and discussion Fastness of Aramid Fiber dyed by SFD & WD Sample Fastness A C Washing Staining N P Ac W Fade Rubbing D W Light Sublimation CI Disperse Red 6, % (ARAMID) 4~ 4~ 4~ CI Disperse Blue 6, % (ARAMID) 4~ 4 4~ 4~ 4~ 4~ 4 4~ CI Disperse Yellow 4, % (ARAMID) 4~ 4 4 4~ 4~ 4 3~4 CI Disperse Red 6 Wet dyeing, % (ARAMID)

15 Conclusions Conclusions The highest color strength (K/S) of the dyed Aramid spun yarn was obtained when the experiment was performed at o C and 3MPa The adsorption isotherms were obtained with the concentration of the three dyestuffs These adsorption isotherms follow Langmuir type Dyeability of SFD with dyestuffs were better in the order of DB6 > DY4 > DR6 Fastness properties of the dyed yarn were fair except for light fastness and color fastness for sublimation

16 Results and discussion Adsorption isotherm of dyestuff for Aramid 2 2 Color Strength(K/S) 2 3MPa 9 3 2MPa Concentration of the dye(owf, %) Color Strength(K/S) 2 3MPa 3 2MPa Concentration of the dye(owf, %) Color Strength(K/S) 3MPa 2 3 2MPa Concentration of the dye(owf, %)

17 Experimental SFD system 2 Circulation Pump SFD Device ( MAX P & T, 3 MPa & 7 o C ) 3 Gas Booster

18 Results and discussion Some Results from SFD CI Disperse Red 6 CI Disperse Blue 6 CI Disperse Yellow 4

Dyeing of Stockings of Spandex/nylon Core Yarns with Disperse Dyes in Supercritical CO 2 Fluid

Dyeing of Stockings of Spandex/nylon Core Yarns with Disperse Dyes in Supercritical CO 2 Fluid "Science Stays True Here" Biological and Chemical Research, 1-10 Science Signpost Publishing Dyeing of Stocki of Spandex/nylon Core Yarns with Disperse Dyes in Supercritical CO 2 Fluid Li Zhenhua, Zheng