Side chain-containing aliphatic diol modified copolyester section and preparation method thereof

Abstract

The invention relates a side chain-containing aliphatic diol modified copolyester section and a preparation method thereof; the section is copolymerized by terephthalic acid, ethanediol, m-benzene dicarboxylic acid diethyl ester-5-sodium sulfonate or potassium sulfonate and side chain-containing aliphatic diol and is synthesized in a semicontinuous polymerzation device. The copolyester section of the invention can be dyed to dark color with cationic dye at room temperature and normal pressure; the crystallization property and the glass state temperature of the copolyester are reduced so that the prepared fibre has extremely soft hand feeling; the manufacturing process has no special demand on devices and the cost is low so that the preparation method is applicable to industrialized production.

Description

technical field [0001] The invention belongs to the field of cationic dye-dyeable copolyester fiber and its preparation, in particular to a copolyester chip modified with side chain aliphatic dihydric alcohol and its preparation. Background technique [0002] There are many ways to improve the dyeability of polyester fibers. The most widely used method is to add modified monomers for copolymerization, which can be roughly divided into the following three types: (1) Dyeable monomers for cationic dyes, such as sodium m-benzenesulfonate (or potassium ) class; (2) dyeable monomers of disperse dyes, such as isophthalic acid with meta-structure; polyethylene glycol and sebacic acid with flexible structure; (3) dyeable monomers of acid dyes, such as Amino compounds. [0003] Cationic dyes can dye polyester fibers. It was invented by DuPont Company of the United States in 1958. The trade name is DACON, referred to as CDP. It was industrialized in 1962. In the 1980s, Japan's Toray ...

AI Technical Summary

Problems solved by technology

High temperature and high pressure cationic dyeable copolyester fiber CDP, because the dyeing must be carried out under high temperature and high pressure conditions, when the fiber is blended with natural fibers such as cotton, wool and linen, the properties of natural fibers will be affected

Atmospheric pressure cationic dyes are easy to dye polyester fiber ECDP. Due to the introduction of polyether into the macromolecule, the heat resistance of the fiber is poor and the spinning is unstable, which affects the spinnability and the performance of the fabric.

Since the 1990s, developed countries such as the United States and Japan have developed a batch of brand-new products with normal pressure cationic dyes and easy-to-dye polyester fibers HCDP by increasing the SIP content. This fiber has better dye uptake and color fastness. Degree, and as the content of SIP increases, its hygroscopicity and antistatic properties increase greatly, but due to the increase in the content of SIP in the polymerization stage, the interaction of ionic groups increases, resulting in a sharp increase in melt viscosity, making polymerization difficult It is very difficult to increase the molecular weight of the polymer, so the molecular weight of HCDP is generally low, and the high viscosity during melting also causes difficulty in product processing and decline in mechanical properties. In addition, although the problem of dyeing with natural fiber blending is solved, but Due to the high content of the third monomer (three single content 3-6mol%), the production cost increases, which affects further expansion of production

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