Nguyen Thi Huong, Vu Thi Hong Khanh, Ngo Ha Thanh, Phan Duy-Nam
School of Textile-Leather and Fashion (STLF)-Hanoi University of Science and Technology (HUST), No. 1, Dai Co Viet, Hai Ba Trung, Hanoi 100803, Vietnam.
Hanoi Industrial Textile Garment University, Le Chi, Gia Lam, Hanoi 100803, Vietnam.
Polymers (Basel). 2020 Jul 16;12(7):1575. doi: 10.3390/polym12071575.
Cotton fabric treated by Pyrovatex CP New (PCN) and Knittex FFRC (K-FFRC) using the Pad-dry-cure method showed an excellent fire-retardant effect. However, it needed to be cured at high temperatures for a long time leading to a high loss of mechanical strength. In this study, atmospheric-pressure dielectric barrier discharge (APDBD) plasma was applied to the cotton fabric, which then was treated by flame retardants (FRs) using the pad-dry-cure method. The purpose was to have a flame-retardant cotton fabric (limiting oxygen index (LOI) ≥ 25) and a mechanical loss of the treated fabric due to the curing step as low as possible. To achieve this goal, 10 experiments were performed. The vertical flammability characteristics, LOI value and tensile strength of the treated fabrics were measured. A response model between the LOI values of the treated fabric and two studied variables (temperature and time of the curing step) was found. It was predicted that the optimal temperature and time-to-cure to achieve LOI of 25 was at 160 °C for 90 s, while the flame-retardant treatment process without plasma pretreatment, was at 180 °C and 114 s. Although the curing temperature and the time have decreased significantly, the loss of mechanical strength of the treated fabric is still high. The tensile strength and scanning electron microscopy (SEM) images of the fabric after plasma activation show that the plasma treatment itself also damages the mechanical strength of the fabric. X-ray photoelectron spectroscopy (XPS) spectra of the fabric after plasma activation and energy-dispersive spectroscopy (EDS) analysis of the flame retardant-treated (FRT) fabric clarified the role of plasma activation in this study.
采用轧烘焙法用新型Pyrovatex CP（PCN）和Knittex FFRC（K - FFRC）处理的棉织物显示出优异的阻燃效果。然而，它需要在高温下长时间焙烘，导致机械强度损失较大。在本研究中，将常压介质阻挡放电（APDBD）等离子体应用于棉织物，然后采用轧烘焙法用阻燃剂（FRs）对其进行处理。目的是获得阻燃棉织物（极限氧指数（LOI）≥25），并且使处理后的织物因焙烘步骤导致的机械性能损失尽可能低。为实现这一目标，进行了10次实验。测量了处理后织物的垂直燃烧特性、LOI值和拉伸强度。发现了处理后织物的LOI值与两个研究变量（焙烘步骤的温度和时间）之间的响应模型。预测实现LOI为25的最佳温度和焙烘时间是160℃下90秒，而没有等离子体预处理的阻燃处理工艺是在180℃下114秒。尽管焙烘温度和时间显著降低，但处理后织物的机械强度损失仍然较高。等离子体活化后织物的拉伸强度和扫描电子显微镜（SEM）图像表明，等离子体处理本身也会损害织物的机械强度。等离子体活化后织物的X射线光电子能谱仪（XPS）光谱和阻燃处理（FRT）织物的能量色散光谱（EDS）分析阐明了本研究中等离子体活化的作用。
