Copolyester melt direct-spinning controllable multiple differential shrinkage composite fiber and preparation method thereof

Abstract

The invention relates to a copolyester melt direct-spinning controllable multiple differential shrinkage composite fiber and a preparation method thereof. Terephthalic acid and ethylene glycol serve as raw materials, a third component of polyethylene glycol, a fourth component of diethylene glycol and a fifth component of pentaerythritol are added for copolymerization, a copolyester melt is prepared, pressurized through a melt pipeline and a pressurizing pump, conveyed to a spinning box, divided into two ways through two metering pumps, sent into a spinning assembly and a spinneret plate for extrusion and cooled and solidified to form two bundles of yarn, FDY (fully drawn yarn) is obtained after oiling wheel oiling, pre-interlacing, drawing and heat setting of one of the two bundles of yarn, the other bundle of yarn is oiled through an oil spraying nozzle and then led to two yarn guiding disks to obtain POY (polyester pre-oriented yarn), the FDY and the POY are input into a yarn doubling device and a main interlacing device simultaneously for composition, and the composite fiber is obtained after ultra-high-speed winding molding. The composite fiber adopts the better fine three-dimensional multi-layer structure and is large in potential controllable hot-shrinkage rate difference, good in fluffiness, hygroscopicity, air permeability, moisture retention, chromaticity and high color rendering uniformity, multiple in product function and high in additional value.

Description

technical field [0001] The invention relates to a polyester different shrinkage composite fiber and a preparation method thereof, belonging to the technical field of chemical fibers. Background technique [0002] At present, the polyester different shrinkage composite fibers and their products on the domestic and foreign markets are mainly prepared through the following several technical approaches, such as using polyester fibers with different cross-sectional shapes or different properties, and air-induced shrinkage along the length of the filaments. Repeated and continuous network combination or joint combination processing method to achieve, generally using conventional spinning and drawing (UDY-DY), high-speed spinning or spinning and drawing one-step process, and then pre-oriented yarn (POY) Composite process route with drawn yarn (DY) or fully drawn yarn (FDY). See attached figure 1 , which is a schematic diagram of the process flow for preparing FDY polyester fibers...

AI Technical Summary

Problems solved by technology

See attached figure 1 , which is a schematic diagram of the process flow for preparing FDY polyester fibers in the prior art; the polyester melt is extruded from the spinneret 1 micropore, cooled to obtain the tow 2 to be formed and fully drawn, and oiled and guided by the oil tanker 3 Device 4, wire pressing rod 5 input pre-network device 6 to carry out pre-network, then input first drawing roller 10 and first dividing roller 9 devices, second drawing roller 11 and The second splitting roll 12 device is stretched and heat-set, and through the network of the main network device 13 and the winding device 14, the FDY polyester fiber is obtained, and the polyester fiber fabric made by it has a poor dyeing rate. Uneven dyeing, high temperature and high pressure dyeing, poor moisture absorption, breathability and moisture retention, easy to generate static electricity, single product function

[0003] Chinese invention patent CN102828262A discloses a processing method for producing different shrinkage composite fibers by melt direct spinning. The process steps are: esterification of raw materials purified terephthalic acid and ethylene glycol, preparation of polyester melt, and melt transportation , Simultaneous spinning of pre-oriented yarn and full-drawn yarn, oiling, full-drawn yarn pre-network, full-drawn yarn drawing and setting, network compounding and winding, to produce different shrinkage composite fibers. The method for producing hetero-shrinkage composite fibers by direct spinning of polyester melt obtained from phthalic acid and ethylene glycol has the disadvantages of complex processing procedures, long process, high production cost, low efficiency, and single function. Polyester differential shrinkage composite fiber products have poor composite uniformity and uneven dyeing, poor moisture absorption, breathability and moisture retention, and are prone to static electricity. The surface of the fabric produced shows white spots, and the product quality is unstable.

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