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- Title
Preparation and properties of flame-retardant modified Lyocell fiber by blending method.
- Authors
ZHAO Qingbo; WANG Shuli; GAO Min; XU Zhongkai; CHENG Chunzu; LI Ting; XU Jigang
- Abstract
A highly dispersed melamine cyanuric acid (MCA) dispersion with N-methylmorpholine- N-oxide ( NMMO ) aqueous solution as the dispersion medium was prepared using a wet grinding process to address the issues of blockage, wire breakage and flame retardant precipitation in the production process of flame retardant Lyocell fibers using the blending method. The prepared MCA dispersion was used as the flame retardant to prepare flame retardant Lyocell fibers. The stability of MCA dispersion particle size and pH stability, the distribution characteristics of MCA in the spinning solution, the effects of particle size and surface additive content of MCA dispersion on fiber spinnability, thermal stability, mechanical properties and flame retardancy of flame retardant Lyocell fibers were analyzed using laser particle size analyzer, optical microscope, scanning electron microscope, fiber size analyzer, thermogravimetric analyzer, limiting oxygen index analyzer and other equipment. The results show that the particle size and pH value of MCA dispersion have no change. The dissolution degree and dissolution rate of MCA in the spinning solution significantly increase under stirring and vacuum conditions; The particle size of MCA dispersion and the content of surface additives have a significant impact on the spinnability of fibers. For example, when the particle size D90 is 0.5 µm (90% of the particles have a diameter less than 0.5 µm), and the content of surface additives accounts for 6% of the flame retardant, there are no problems such as blocking, fiber breakage, and a large amount of flame retardant precipitation in the coagulation bath during the spinning process; When the MCA content accounts for 40% of the weight of Lyocell fibers, the fibers exhibit good mechanical properties, flame retardancy, and washing resistance. The highest inechanical strength is 2.76 cN/dtex, and the limiting oxygen index (LOI) is 33. 3%. After 12 machine washes, the LOI value of the fibers remains above 30%; In addition, the initial decomposition temperature of the prepared flame retardant Lyocell fiber was significantly increased compared to ordinary Lyocell fibers, and the residual carbon content of cellulose in the fiber (about 24.03%) was higher than that of non flame retardant fibers (about 16.53%) .
- Subjects
FIRE resistant polymers; FIREPROOFING; BLENDED yarn; FIREPROOFING agents; WASHING machines; FLAME temperature; SCANNING electron microscopes; CYANURIC acid
- Publication
Wool Textile Journal, 2023, Vol 51, Issue 10, p14
- ISSN
1003-1456
- Publication type
Article
- DOI
10.19333/j.mfkj.20230104307