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New Development in Flame Retardant Finishing of Blends of Polyamides for Protective Clothing

发布日期:2016-06-30

报告题目:New Development in Flame Retardant Finishing of Blends of Polyamides for Protective Clothing

报告人:Charles Q. Yang, Professor Emeritus,Department of Textiles, Merchandising and Interior,The University of Georgia, U.S.A

报告时间:2016年7月5日(周二)二点

报告地点:独墅湖校区908号楼6楼多媒体教室

报告人简介:Dr. Yang came to the U.S. in December 1982 and received his Ph.D. in analytical chemistry from Kansas State University, 1987. After teaching at the Department of Chemistry at Marshall University, Huntington, West Virginia, for 3 years as an assistant professor, Dr. Yang joined the faculty at the Department of Textiles, Merchandising and Interiors at the University of Georgia, Athens, Georgia in 1990 as an associate professor. He was promoted to the rank of professor in 1995. Professor Yang was the recipient of 2012 Olney Medal, the highest honor awarded by American Association of Textile Chemist and Colorist. Since he joined the faculty at the University of Georgia in 1990, Dr. Yang has extended his research to textile functional finishing and has established himself as world renowned researcher in this field. He published more than 140 papers in peer-reviewed professional journals and held 8 patents on textile finishing. Dr. Yang is an internationally recognized scholar in the fields of durable press finishing and flame retardant finishing.

报告摘要:In this presentation, flame retradant polyamides and the urgent needs for high performance flame retardant textiles for military protective clothing will be reviewed. Because the most widely used flame retardant textiles are the blend fabrics of both aliphatic and aromtic polyamides, the focuse of this presentation will be on (1) flame retardant finishing of the Nomex/cotton blend fabric and (2) flame retardant finishing of the nylon/cotton blend fabrics. Both finishing methods were based hydroxy-functional organophosphorus oligomers (HFPO) using the conventional pad-dry-cure processes.The Nomex/cotton blend fabric was treated using HFPO, 1,2,3,4-butanetetracarboxylic acid (BTCA) as the bonding agent and triethanol amine (TEA) as the co-reactant. The bonding mechanism will be discussed in details. BTCA reacts with HFPO, cotton and TEA to form a crosslinked polymeric network, thus improving hydrolysis-resistance of HFPO on the blend. The Nomex/cotton blend treated with the HFPO/BTCA system showed high flame retardant performance and excellent laundering durability at very low add-on levels. Both the bonding mechanism and flame retardant performance could be explained by the data of heat release properties of the treated fabrics corrected using micro-scale combustion calorimetry (MCC).We also discuss the applications of HFPO to the flame retardant finishing of the two differnt 50/50 nylon/cotton blend military fabrics. HFPO was bound to both nylon and cotton fabric in the presence of dimethyloldihydroxyethyleneurea (DMDHEU) by forming a polymeric crosslinked HFPO/DMDHEU networks and by HFPO-DMDHEU-cotton bridging. The treated blend fabric passed the vertical burning test after 50 launderings cycles. The MCC data indicated that the nylon and cotton fibers interacted with each other during the decomposition of the treated blend fabric. Such interaction reduced the peak heat release rate for cotton and nylon, and consequently reduced the flammability of the treated nylon/cotton blend fabric.