Flame retardant cellulose fiber application and process research
Flame-retardant cellulosic fiber, which is used for clothing, has poor wearing comfort and can only be used for tooling materials. The production and use of flame-retardant fiber fabrics are relatively small.
Downstream product analysis
1. Flame retardant fabric
Flame-retardant fabric refers to a labor-protective fabric that prevents itself from being ignited or slows down and stops burning after contact with a flame or a hot object. It is suitable for operation near sparks or molten metal in open flames, or in the presence of flammable or explosive materials. Work in an environment with a fire hazard.
2. Thermal protective textiles
Through the study of the heat generation and process of various heat sources, the law of heat sources is recognized, heat-resistant textile materials are used, and thermal protective clothing is designed to achieve effective heat protection. In the past, due to the low level of protection technology and protection, people's research was limited to the study of the flame retardancy of single-layer fabrics, and did not involve the performance study of fabrics under thermal protection conditions. In recent years, developed countries have begun to study the thermal protection performance of fabrics, and the thermal protection performance design of flame-retardant protective clothing is an important indicator for designing protective performance of clothing. General industrial flame retardant protective clothing, welding protective clothing, fire fighting clothing, fire insulation clothing, arc protection clothing, heat-resistant metal splash protection clothing, etc. have clear requirements for thermal protection performance.
Research progress on new applications at home and abroad
Flame retardant cellulose fibers are mainly studied from the processing technology of flame retardants and fibers.
1) Strengthen the development of flame retardants
The flame retardant for cellulose fiber mainly comprises a halogen-antimony flame retardant, an alkyl or arylphosphonic acid derivative, a polyphosphonate, a phosphazene polymer, etc., and is an organic compound or an inorganic substance containing phosphorus or halogen. There are certain problems of toxicity or environmental pollution. For example, halogen-based flame retardants can easily release corrosive gases such as hydrogen bromide and hydrogen chloride, as well as highly toxic gases such as sulphur. Phosphorus-based inorganic flame retardants easily enter the waters and cause oceans. The red tide and so on. Therefore, we continuously develop the varieties and types of flame retardants for fibers, and improve the flame retardant effect of flame retardants for fibers, so that they are non-toxic or low-toxic, halogen-free, low-smoke, and have little impact on the environment and have flame retardant properties. healthy growth.
2) Improve the processing technology of flame retardant fiber
At present, most of the production methods of natural cellulose still use the traditional viscose production process, which has long production process, high energy consumption and high production cost. In the production, a large amount of toxic gases CS2 and H2S are released, and at the same time, a large amount is generated. Waste water, waste liquid and waste residue cause huge pollution to the environment. Therefore, researchers at home and abroad are generally concerned about the environmentally friendly green production process of cellulose fibers. These processes include N-methylmorpholine-N-oxide (NMMO), cellulose carbamate (CC), and steam. Flash explosion method and melt plasticization spinning method. Among them, the spinning of cellulose fibers with NMMO as a solvent has been industrialized in foreign countries.