초소수성 디지털날염 면직물 개발

학위논문 (석사)-- 서울대학교 대학원 : 생활과학대학 의류학과, 2018. 2. Park, Chung Hee.의복과 직물이 발수성과 자가세정성능이 필요한 환경에 노출되기에, 이를 위해 의복 및 직물 산업에 적용가능한 초소수성 디지털날염 면직물이 딥코팅 방법을 통해 개발하였다. 제작된 디지털날염 직물의 표면형태 및 마이크로구조는 주사전자현미경으로 관측하였다. 처리시료의 공기투과도 측정을 통해 투과성능이 있는 것을 확인하였다. 제작된 시료의 코팅내구성 평가는 세탁내구성 평가를 통해 이루어졌다. 시료는 내구성이 있는 것으로 나타났으며, 내구성 평가 후 열처리를 하였는데, 세탁내구성 평가 전 162°의 접촉각을 보이던 시료는 세탁내구성 평가와 열처리 후 그보다는 낮은 156°의 접촉각을 보여 초소수성 디지털날염 면직물이 자가회복성능을 나타내는 것을 확인하였다. 개발된 날염직물의 기울임각(shedding angle)은 처리된 날염 면직물의 달라붙는 성질 때문에 용납되는 최대값인 10° 이상의 결과를 나타내어 기록할 수 없었다. 그렇기에, 이 방법은 발수성과 자가회복 두 가지 성능을 가진 디지털날염직물을 만들었고, 의복과 직물 산업, 특히 패션 악세서리에서 적용될 수 있을 것이다.A superhydrophobic digital-printed cotton fabric has been developed by the dip coating method to find applications in the apparel and textile industries due to the exposure of apparel and textiles products to the environment regarding water-repellency and self-cleaning abilities. The microstructure and surface morphology of the prepared digital-printed fabrics was examined using the scanning electron microscopy. Fabrics proved breathable based on the air permeability of the prepared samples. Evaluation of coating durability of the modified digital-printed fabric was by a washing method. This revealed the durability and self-healing properties of the treated digital-printed cotton fabric after heat-treatment with water contact angle at 156o lower than the water contact angle recorded before the evaluation of coating durability at 162o. The water shedding angle for the developed digital-printed fabric could not be recorded due to the stickiness of the surface of the treated digital printed cotton fabric which produced an angle above the accepted angle at 10o. Therefore, this technique produced a digital-printed fabric with double functionalities of water-repellency and self-healing properties and could be used in the apparel and textiles industries especially for fashion accessories.Introduction 1 1.1. Necessity of study 1 1.3. Theoretical background 2 1.3.1. Digital printing 2 1.3.2. Superhydrophobicity 5 1.3.3. Superhydrophobic development 11 1.3.4. Superhydrophobic development using zirconia particles 13 Experimental 18 2.1. Materials 18 2.2. Digital Printing and Superhydrophobic Treatment 19 2.2.1. Digital-printing and fixation of pigment 19 2.2.3 Preparation of cotton fabric 21 2.2.4. Fabrication of superhydrophobic digital-printed fabric 22 2.3. Characterization 27 2.3.1. Evaluation of surface morphology 28 2.3.2. Evaluation of water contact angle and shedding angle 28 2.3.3. Evaluation of colour difference 29 2.3.4. Evaluation of air permeability 29 2.3.5. Various liquids-repellency tests 30 2.3.6. Evaluation of coating durability 30 2.3.7. Self-cleaning property of fabricated digital-printed fabrics 31 Results and Discussion 32 3.1. Surface morphology of treated and untreated fabrics 32 3.2. Water contact angle and shedding angle 36 3.3. Repellency 38 3.5. Durabilty of coating after heat treatment 41 3.6. Effect of treatment on colour 42 3.7. Air permeability 43 3.8. Self-cleaning Ability 44 Conclusion 46 References 47 Abstract in Korean 53Maste

One-Bath Pretreatment for Enhanced Color Yield of Ink-Jet Prints Using Reactive Inks

In order to facilely increase the color yield of ink-jet prints using reactive inks, one-bath pretreatment of cotton fabrics with pretreatment formulation containing sodium alginate, glycidyltrimethylammonium chloride (GTA), sodium hydroxide, and urea is designed for realizing sizing and cationization at the same time. The pretreatment conditions, including the concentrations of GTA and alkali, baking temperature, and time are optimized based on the result of thecolor yield on cationic cotton for magenta ink. The mechanism for color yield enhancement on GTA-modified fabrics is discussed and the stability of GTA in the print paste is investigated. Scanning electron microscopey, tear strength, and thermogravimetric analysis of the modified and unmodified cotton are studied and compared. Using the optimal pretreatment conditions, color yield on the cationic cotton for magenta, cyan, yellow, and black reactive inks are increased by 128.7%, 142.5%, 71.0%, and 38.1%, respectively, compared with the corresponding color yield on the uncationized cotton. Much less wastewater is produced using this one-bath pretreatment method. Colorfastness of the reactive dyes on the modified and unmodified cotton is compared and boundary clarity between different colors is evaluated by ink-jet printing of colorful patterns