Preparation method of cationic dyeable halogen-free flame retardant polyester fiber

Abstract

The invention relates to a preparation method of the cationic dyeable halogen-free flame retardant polyester fiber, which comprises the following process steps: 1. adding monosodium isophthalic sulfonate, 2-propyloic hypophosphorous acid and de-ionized water into a reaction container, filtering out reaction products after the reaction is completed, and carrying out baking to obtain cationic dyeable flame retardant compounds; 2. adding terephthalic acid, products in the first step and glycol into an esterification kettle, then, adding antimony ethylene glycalate, conducting the materials into a polycondensation kettle, and carrying out reaction and material outlet to obtain cationic dyeable flame retardant polyester slices; and 3. drying the cationic dyeable flame retardant polyester slices prepared in the second step through a vacuum drum drying machine, carrying out spinning on the dried slices on a spinning machine according to a conventional polyester spinning process to obtain thecationic dyeable halogen-free flame retardant polyester fiber. The invention realizes the flame retardant performance and the cationic dyeable performance of the polyester through one-step addition, avoids the complicated process and the occurrence of various kinds of secondary reaction caused by a traditional method of adding flame retardant agents and cationic dyeable auxiliary agents in two steps, and has more stable and obvious flame retardant and cationic dyeable effect.

Description

(1) Technical field [0001] The invention relates to a preparation method of a class of cationically dyeable halogen-free flame-retardant polyester fibers. The polyester fiber has the characteristics of easy dyeing with cationic dyes and can be used in various industries such as aviation, railway and other transportation systems and fire protection. (2) Background technology [0002] Polyester fiber has many excellent properties, such as high breaking strength and elastic modulus, moderate resilience, excellent heat setting, good heat resistance and light resistance, and the fabric has the characteristics of easy washing and quick drying, so it has a wide range of consumer and industrial uses. . However, polyester has a tight structure, high crystallinity, and no hydrophilic genes in the internal macromolecules, so dyeing is difficult, and polyester fibers can burn, which limit the actual production and application of polyester fibers to a certain extent. Therefore, it is v...

AI Technical Summary

Problems solved by technology

The method obtains cationic dyeable and flame retardant properties by adding cationic dyeable agent and flame retardant step by step, but its production process is complicated, and NaOH, manganese acetate, etc. are added as catalysts in the production process. Due to the variety of additives, Various side reactions will occur during the reaction, which will eventually affect the performance of the product; and adding hydroxyethyl phosphoric acid during polycondensation will react with sulfonate to form sulfurous acid, which will eventually lead to a decrease or even disappearance of cationic dyeability

[0005] In the reports of cationic dyeable flame retardant polyester at home and abroad, there are the same problems as the application number 200410084108.X, the production process is complicated, and because the flame retardant and cationic dyeable additives are divided into esterification and polycondensation Two-stage addition requires the addition of various corresponding catalysts, resulting in an increase in intermediate by-products, so the reaction is unstable, and various stabilizers and composite catalysts need to be added, which will eventually lead to an increase in cost, and with the intensification of side reactions, some With more by-products, the performance of the product will not be improved