Method for preparing modified cellulose fire-retardant fiber through reaction extrusion

Abstract

The invention discloses a method for preparing a modified cellulose fire-retardant fiber through reaction extrusion, and the method comprises the following steps of: 1. preparing a fire retardant, cellulose, a solvent and an acid-binding agent into a mixture according to a certain mass ratio, wherein the fire retardant is a novel phosphorus-based fire retardant, the cellulose is one of wood pulp, cotton pulp or bamboo pulp, the solvent is ion liquid, the acid-binding agent is potassium carbonate, the proportion is as follows: the mass ratio of the acid-binding agent to the fire retardant is 0.1-0.5:1, the mass ratio of the fire retardant to the cellulose is 0.5-2:1, and the mass ratio of the cellulose to the solvent is 10-25:90-75; 2. feeding the mixture into a double-screw extruder, and synchronously carrying out dissolution, reaction and extrusion of the cellulose through a reaction extrusion method to obtain the freshly formed filament of modified cellulose; and 3. stretching, washing, thermoforming and curling the freshly formed filament to prepare the modified cellulose fire-retardant fiber. The modified cellulose fire-retardant fiber obtained through the method disclosed by the invention has the advantages of no halogen, environmental friendliness without pollution and outstanding flame-retardant effect.

Description

technical field [0001] The invention relates to a preparation technology of modified cellulose flame retardant fiber, in particular to a method for preparing modified cellulose flame retardant fiber by reactive extrusion. Background technique [0002] Cellulose is the most abundant natural polymer material bestowed by nature to human beings. It is not only rich in sources, but also a renewable resource. Processing and utilization of cellulosic materials is of positive significance to the world's circular economy and sustainable development. However, because cellulose materials are highly flammable in case of fire, the limiting oxygen index is only about 17, which limits its use in the fields of life and industry. Therefore, the production of flame-retardant cellulose materials to prevent fires has become a social problem that cannot be ignored, and has attracted more and more attention. [0003] At present, many countries in the world have put forward specific requirements...

AI Technical Summary

Problems solved by technology

The above two preparation methods of flame retardant cellulose fibers also adopt the blending method. Although the spinning process used can make the flame retardant evenly dispersed without adding other additives, the flame retardant and cellulose molecules are physically separated. Effects (such as van der Waals force, intermolecular force) are combined, so that with the increase of fiber use time and washing times, the loss of flame retardant is serious, and its content in the fiber decreases; the flame retardant effect of the fiber also decreases, and the flame retardant The burning time is shortened, resulting in a shortened service life of flame-retardant fibers

Moreover, in the patent CN101608348, the wet or dry-wet spinning process is adopted, and the time for mixing and dissolving to prepare the flame-retardant spinning solution is too long, so that the efficiency of the entire spinning process is low