Low-melting-point copolyester and method for preparing same

Abstract

The invention relates to low melting point copolyester and a preparation method thereof. The low melting point copolyester is made from the following monomers followed by the esterification reaction and the polycondensation reaction: (a) terephthalic acid (PTA) and isophthalic acid (IPA), (b) 1, 4- butanediol (BDO) and (c) polyethylene glycol 600 to 6000 (PEG); wherein, in the a component, the feeding mass ratio of the terephthalic acid and the isophthalic acid is between 80 to 20 : 20 to 80; in the c component, the feeding weight ratio of polyethylene glycol is 1 to 30 percent based on the a; the molar ratio of the a and the b is 1:1.5 to 2.3. The preparation method comprises an esterifcation stage and a polycondensation stage. The copolyester has the characteristics of low melting point, good crystallization property, high intrinsic viscosity and difficult adhesion of particles, and is suitable for spinning the filament, the staple fibers and the non-woven fabrics.

Description

technical field [0001] The invention relates to a low-melting copolyester suitable for filaments, short fibers and non-woven fabrics and a preparation method thereof, belonging to the technical field of textiles. Background technique [0002] Polyester (polyethylene terephthalate) has a melting point of 265°C. According to the melting point, copolyesters with a melting point lower than 230°C are generally called low melting point polyesters. In the field of textiles, low-melting point polyester is usually made into filaments and short fibers for thermal bonding with main fibers. Due to the different materials and shapes of the fibers to be bonded, the processing state, process conditions, and energy-saving considerations, the melting point requirements for low-melting point fibers are also different. Some low-melting point fibers are used for bonding non-woven fabrics. Under normal circumstances, 180°C can meet the requirements, and some low-melting fiber products require ...

AI Technical Summary

Problems solved by technology

Although they meet the requirements of low melting point, the thermal and mechanical properties of the resin become poor, especially its inherent good crystallization properties are severely damaged, and some are in an amorphous state.

Some resins of this type are easy to stick together during drying and pre-crystallization, and stick to rolls and coils during spinning and forming, which seriously affects their practicability; there are also resins whose melting point meets the requirements, but their intrinsic viscosity is relatively low. Low, when used as a fiber, there are many problems in processing, the wool and broken filaments are serious in spinning and forming, and the production efficiency is very low

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