A production method for directly spinning hydrophilic and moisture-conducting polyester staple fibers

Abstract

A production method of hydrophilic moisture-transmitting polyester staple fibers used for direct spinning is provided. The method includes (1) mixing terephthalic acid and ethylene glycol, performing prepolymerization, and subjecting the obtained prepolymer to polycondensation in a final-polymerization kettle to obtain hydrophilic modified copolyester melt, and (2) directly conveying the melt to a spinning box, extruding through a special-shaped spinning plate to obtain the hydrophilic moisture-transmitting polyester staple fibers. Moisture-transmitting functional groups are introduced into a polyester system adopting PET as a main structure, a titanium catalyst and a composite antioxidant heat stabilizer are adopted in a process, a polyether type hydrophilicity modifying agent is added in a pre-polycondensation stage, and therefore the retention time of polyether in the kettle is shortened, degradation of polyether is avoided, steps of slicing polyester and drying are omitted, possibility of polyether bond breakage and polyester degradation is further reduced, and the fibers with excellent mechanical performance can be prepared with low intrinsic viscosity.

Description

technical field [0001] The invention relates to a preparation method of polyester staple fiber, in particular to a preparation method of hydrophilic moisture-conducting polyester staple fiber. Background technique [0002] In recent years, people have higher and higher requirements for the comfort, health, safety and environmental protection of clothing fabrics. With the increase of people's outdoor activities, the trend of mutual penetration and integration of casual wear and sportswear is also It is increasingly favored by consumers. The fabrics of this type of clothing not only require good comfort, but also require that during activities, once sweating occurs, the clothing will not stick to the skin and produce a cold and damp feeling. Therefore, new requirements for the functions of hydrophilic and moisture-conducting, moisture-absorbing and quick-drying are put forward for the fibers of the fabric. As we all know, cotton fiber has good hygroscopic performance and is c...

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Problems solved by technology

However, the amount of the catalyst used in the claim of the invention is 120-500ppm, which can easily cause too many impurities in the polyester melt, and the antimony series catalyst is a heavy metal, which is easy to cause damage to the environment or the human body, and its fiber fabric cannot directly Used in underwear or clothing fabrics in direct contact with the human body

Moreover, the patent does not specify that the hydrophilic polyester is a continuous preparation method, and the polyester fiber does not reflect the function of moisture conduction and drainage

[0005] Chinese patent CN1135494A patent uses oxidized polyolefin compound as hydrophilic modifier, and adds cross-linking agent to improve the degree of polymerization of its graft copolymerization, and then carries out composite spinning with other polyesters to achieve moisture absorption effect, and the polymerization of adding cross-linking agent It will cause disadvantages such as poor spinnability and poor fiber formability.

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