Polyester industrial yarn solid-phase polymerization flame-retarding chain extender and preparing method thereof

Abstract

The invention provides a polyester industrial yarn solid-phase polymerization flame-retarding chain extender, which mainly comprises a double-end-group benzoic acid anhydride group serving as a chain extension group and a flame-retarding group containing phosphorus. Two acid anhydrides in a molecule can be used for reacting with hydroxyl in dacron molecules so that intrinsic viscosity of dacron is improved. Simultaneously, phosphorus is introduced into the molecule structure so that flame-retarding performance of dacron is improved. The invention further relates to a preparing method of the polyester industrial yarn solid-phase polymerization flame-retarding chain extender, which includes: (1) dissolving PCl3 into mixed solvent of CHCl3 / (CH3CH2O)2, dropwise adding 3-hydroxy phthalic anhydride solution dissolved in the mixed solvent of CHCl3 / (CH3CH2O)2, and performing heat preservation backflow reaction at certain temperature; and (2) evaporating a part of solvent at certain temperature after the reaction proceeds for a certain time, filtering the mixture which generates faint yellow sediments to obtain mixed solvent of CHCl3 / (CH3CH2O)2 for solids, and recrystallizing to obtain required flame-retarding chain extension crystals.

Description

technical field [0001] The invention relates to a solid-phase polymerization flame-retardant chain extender for polyester industrial yarn and a preparation method thereof, in particular to a reactive double-terminal group, especially containing phthalic anhydride groups and phosphorus-containing groups , especially for improving the problem that the small molecules produced in the solid state polymerization process of polyester industrial yarns are difficult to remove, and conventional polyester industrial yarns do not have certain flame retardant properties. Mild reaction conditions are used to prepare flame retardant A solid phase polymerization chain extender for polyester industrial yarn. Background technique [0002] Polyester industrial yarn generally uses low-viscosity PET chips to make high-viscosity PET chips through solid-state polymerization, and then high-viscosity PET is a high-performance fiber produced at a spinning temperature above 300°C. It has excellent c...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a kind of polyester industrial yarn solid phase polymerization flame retardant chain extender and preparation method thereof, utilize PCl 3 in CHCl 3 / (CH 3 CH 2 O) 2 The solution is reacted with the phenolic hydroxyl group in 3-hydroxyphthalic anhydride to prepare a polyester industrial yarn chain extender containing acid anhydride groups and phosphorus elements in the molecular structure; the acid anhydride of the chain extender during solid-phase polymerization of polyester industrial yarn The polycondensation reaction between the group and the hydroxyl group in the PET molecule, and no small molecules are generated during the reaction process, which is beneficial to solve the problems of difficult removal of small molecules, high cost, and strict equipment requirements in the current solid-phase polymerization process of polyester industrial yarns; at the same time, in The phosphorus element introduced in the chain extender has a certain flame retardant function, so that the polyester industrial yarn obtained after chain extension has a certain flame retardant function

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