Abstract: Many existing flame-retardant fibers and flame-retardant finishing methods still struggle to meet the various needs of flame-retardant protective clothing fabrics. Especially after the cancellation of the C-class flame retardant grade in GB 8965.1—2020 standard, the original use of flame-retardant finishing fabric has been more difficult to adapt to the change of technical requirements; it is necessary to seek new technical ways to solve this problem. Cellulose is the most abundant renewable resource on earth, and cellulose fiber has good hygroscopic, comfortable and dyeing properties. With the large-scale industrial production of Lyocell fiber, the problems of environmental pollution and low strength that plagued the development of cellulose fiber for a long time have been solved. China’s academia and industry have carried out extensive and in-depth research and development of high-strength flame retardant fibers on the basis of the Lyocell fiber technology framework and developed and industrialized production of Lyocell fiber flame-retardant regenerative cellulose fibers by blending method and post-finishing method respectively, and obtained high strength and flame retardant properties. It is expected to develop a series of flame-retardant fabrics with high performance and low prices. In the technology of making flame-retardant Lyocell fiber by blending method,it is necessary to establish a processing technology that does not affect the recycling of NMMO. In the postfinishing technology to manufacture flame-retardant Lyocell fiber, it is necessary to prevent the occurrence of closed filament defects.

Key words: flame retardancy; cellulose fibers; blending method; post-finishing method; R&D status