Copolyester section or fiber and preparation method thereof

Abstract

The invention relates to copolyester sheets or a copolyester fiber, which comprises terephthalic acid, m-phthalic acid, glycol and 2-methyl-1, 3-propanediol; the mol ratio of dibasic acids to diatomic alcohols is 1 to 1.7-2.4. The preparation method of the copolyester sheet or fiber comprises the following steps: (1) the terephthalic acid, the m-phthalic acid, the glycol and the 2-methyl-1,3-propanediol are mixed for esterification for 1 to 5 hours together with a catalyzer and a heat stabilizer at 220 to 275 DEG C under the pressure of zero to 0.5MPa; (2) pre-polycondensation follows; the pressure is reduced and the temperature is raised to complete polycondensation, thus getting the copolyester sheets; the copolyester sheets are dried in vacuum, thus getting dry copolyester sheets capable of spinning; and the dry copolyester sheets are spun to get the copolyester fiber. The dyeing behaviour of the copolyester fiber is improved; and the copolyester fiber has the characteristics of resisting roughing and pilling and high contractibility. The preparation method is designed rationally and can be industrialized easily, which is safe for the environment.

Description

technical field [0001] The invention belongs to the field of polyester materials and preparations, in particular to a copolyester chip or fiber and a preparation method thereof. Background technique [0002] Polyester fiber is a fiber made from ethylene terephthalate as raw material after melt spinning. Polyester fiber has excellent physical and mechanical properties, high elastic modulus, good heat resistance, easy washing and quick drying; at the same time, its physical and mechanical properties have great plasticity, and it can be produced with natural fibers such as cotton, wool, and hemp by using different processing techniques. A staple fiber that can also be produced as a filament for weaving or knitting. Therefore, polyester fiber has been developed rapidly all over the world. [0003] Although the physical and mechanical properties and comprehensive wearability of polyester fibers are excellent, due to the tight aggregation of polyester molecular chains, high degr...

AI Technical Summary

Problems solved by technology

[0004] (1) The dyeability is poor, only disperse dyes can be used for high temperature and high pressure dyeing, and it is not suitable for co-dyeing with natural fibers in the same bath;

[0005] (2) The hygroscopicity is low, and its moisture regain is only 0.4% under standard conditions, so the fabric feels stuffy and uncomfortable to wear;

[0006] (3) The electrostatic phenomenon of the fiber is serious, which brings a lot of trouble and even danger to the production and consumption;

[0007] (4) High fiber strength, easy to fluff and pilling, which has adverse effects on the appearance and quality of the fabric;

[0008] (5) The fiber modulus is high, the rigidity is high, and there is a severe itching sensation when taking it

[0009] Due to the above-mentioned defects of polyester fiber, it is greatly restricted in application, forcing scientists to carry out various modifications to polyester fiber.