A kind of direct spinning preparation method of bright ultra-high strength polyester high tenacity polyester staple fiber

Abstract

The invention discloses a direct spinning preparation method of bright ultra-high-strength polyester and high-toughness polyester staple fiber. In the present invention, after mixing and stirring terephthalic acid, ethylene glycol, polyhydroxy compounds and titanium-based catalysts, the esterification reaction is carried out first, and then the further esterification reaction and polycondensation reaction are carried out under the action of the catalyst ethylene glycol antimony. Barium sulfate is added before the reaction to obtain a bright polyester melt with an intrinsic viscosity of 0.650-0.675dl / g. The melt is prepared by spinning to obtain ultra-high strength and high tenacity bright polyester staple fiber. The strength of the prepared fiber is greater than 6.40cN / dtex, the elongation at break is 18-24%, and the dry heat shrinkage at 180°C is 3.5-6.0%, which can meet the product requirements for making high-end sewing threads and reinforcing materials such as papermaking and concrete.

Description

technical field [0001] The invention relates to the technical field of synthetic fibers, in particular to a method for preparing glossy ultra-high-strength and high-toughness polyester staple fibers by direct spinning. Background technique [0002] In recent years, polyester fiber has been used more and more widely, and its performance requirements are also increasing. For example, polyester ultra-short fiber is used in papermaking and concrete fields. It is required that the fiber not only has high strength but also has a certain fracture toughness. to the enhanced effect. Domestic bright polyester staple fiber has been developed due to its rapid growth in demand. The total demand has more than doubled compared with ten years ago, of which 70% are used for processing clothing sewing threads, and 30% are used for processing luggage sewing threads , embroidery thread, woven, knitted fabrics, etc. Since 2012, manufacturers of high-end glossy polyester sewing threads have pro...

AI Technical Summary

Problems solved by technology

Due to the obvious flow field changes during the flow of the melt through the spinneret hole, the extrusion of the polymer melt from the spinneret hole will go through the process of inflow, hole flow, outflow, deformation and stability. If the viscosity is too high, it will cause too much deformation elastic energy stored in the inflow area of ​​the melt, resulting in orifice expansion, which makes spinning forming difficult and the drafting performance in the post-processing process is relatively poor. Difference

In addition, in the high-viscosity melt production process, the requirements for the stirring motor and the booster pump motor in the production process will be further increased, and the loss of the motor will increase, which will increase energy consumption and increase production costs.

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