Preparation of flame-retardant polyester for preparing fiber

Abstract

A method for preparing flame-retardant polyester for manufacturing fiber comprises the following steps: 1) carrying out the esterification of monomer terephthalic acid, ethylene glycol and a reactive flame retardant having a structural formula I, wherein R in the structural formula I is hydroxyalkyl or carboxyalkyl of C1 to C4; and 2) sequentially carrying out the pre-polymerization reaction and the polycondensation reaction in the presence of a polycondensation catalyst to obtain the polycondensation product, that is, the flame-retardant polyester. Nano kaolin particles which serve as a flame-retardant polyester crystallization nucleating agent are added to the reaction system, wherein the nano kaolin particles are added before the esterification or before the pre-polymerization reaction, and the adding amount by the content of the nano kaolin particles existing in the polycondensation products at the end is 0.06 wt% to 1.0 wt%. The deviation of the thermal transformation performance existing between the conventional polyester and the prepared flame-retardant polyester is obviously reduced, so that the conventional polyester fiber manufacturing equipment and the manufacturing process thereof can be adopted to reliably manufacture the flame-retardant fiber.

Description

technical field [0001] The invention relates to a method for preparing a flame-retardant polyester, in particular to a method for preparing a flame-retardant polyester containing a phosphorus-based organic reactive flame retardant for manufacturing fibers. Background technique [0002] Polyester with flame-retardant properties has developed rapidly in recent years, and the application fields of products involve civil and industrial applications, among which flame-retardant polyester fibers are the most widely used. The flame retardants used in flame retardant polyester mainly include three types: additive type, copolymerization reaction type and finishing type. , so the flame retardant performance is more stable and long-lasting. Phosphorus-based reactive flame retardants have excellent flame retardant properties and are environmentally friendly, and are recognized as one of the most ideal polyester flame retardants. Flame retardant polyester products using such flame retar...

AI Technical Summary

Problems solved by technology

This is actually similar to adding inorganic fillers to phosphorus-containing copolyesters to improve their thermal properties. The incorporation of higher content of inorganic particles in the polymer melt has little effect on the manufacture of films or other molded products, but has a significant impact on spinning Silk processing is obviously unfavorable, for example, it is easy to cause broken ends during spinning, and the service life of spinning components is shortened; the yield stress is reduced during drawing, which affects the orientation degree of macromolecules, etc., which will directly affect the mechanical properties of fiber products.

[0005] None of the existing technical solutions clearly proposes to try to reduce the deviation between the phosphorus-containing copolyester and conventional polyester in thermal transition performance, and for polyester fiber manufacturers, it is necessary to reduce the phosphorus-containing copolyester and conventional polyester. The deviation in thermal transition properties of esters should be the most desirable, as this will facilitate the stable production of flame retardant fibers using conventional polyester fiber manufacturing equipment and processes

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