Flame-retardant viscose fiber and preparation method thereof

Abstract

The invention discloses flame-retardant viscose fiber and a preparation method thereof. The flame-retardant viscose fiber mainly comprises the following components in percentage by weight: 20 to 55 percent of polysilicic acid (based on SiO2), 0.5 to 10 percent of pyrophosphoric acid ester and 40 to 70 percent of cellulose. The preparation method comprises the following steps of: (1) adding a solution of sodium metasilicate and a solution of pyrophosphoric acid ester into a yellowed cellulose viscose solution respectively, and uniformly mixing the sodium metasilicate, the pyrophosphoric acid ester and cellulose viscose to obtain a flame-retardant spinning viscose solution; (2) performing spinning molding on the flame-retardant spinning viscose solution in coagulating bath containing sulfuric acid, zinc sulfate and sodium sulfate to obtain as-spun fiber; and (3) after-treating the as-spun fiber, namely washing, desulfurizing, applying oil and drying to obtain the flame-retardant viscose fiber. The synergistic effect of silicon and phosphorus flame retardants greatly improves the flame-retardant effect and high temperature resistance of flame-retardant fiber and the textile processing performance of fabrics.

Description

technical field [0001] The invention relates to the technical field of cellulose viscose fiber, in particular to a flame-retardant viscose fiber and a preparation method thereof. Background technique [0002] The products researched on flame-retardant viscose fiber at home and abroad mainly include: Viscosa FR flame-retardant viscose fiber from Lenzing Company in Austria, which is a phosphoric acid flame retardant that adds phosphorus and nitrogen flame-retardant elements to the pre-spinning stock solution; Kemira Company from Finland Visil fiber; the product name of flame-retardant viscose fiber developed by Hoechest Company in Germany is Danufi L; Japan Asahi Kasei Company uses one or more cyclic and linear compounds as flame retardants, according to the amount of fiber 10~ 40wt% is added to the viscose liquid to obtain a flame-retardant viscose fiber with long-lasting washability. It has good hygroscopicity and dyeability, and is suitable for blending with other fibers to...

AI Technical Summary

Problems solved by technology

[0003] According to the flame retardants used in viscose fibers, they are mainly divided into two categories: phosphoric acid flame retardants containing phosphorus, nitrogen, and sulfur flame retardant elements and inorganic silicon flame retardants, but no matter which flame retardant is used Flame-retardant viscose fiber has unsatisfactory high temperature resistance, and the flame-retardant viscose fiber prepared by using the former has a large smoke when burning, and the cost of flame retardant is high. The flame-retardant viscose fiber prepared by using the latter, Due to the large amount of flame retardant added, the alkali resistance and textile processing performance of the fabric are poor, and there are certain shortcomings.