Method for producing elastic PBT (polybutylene terephthalate) filaments by melt direct spinning
A technology of elastic filament and melt direct spinning is applied in the field of devices for producing PBT elastic filament by melt direct spinning, which can solve the problems of long process, high energy consumption, unstable product quality, etc. The effect of increased flexibility
Active Publication Date: 2015-02-04
WUXI XINGSHENG NEW MATERIAL TECH
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Problems solved by technology
[0004] The purpose of the present invention is to aim at the shortcomings of high energy consumption, long process and unstable product quality in the PBT chip spinning technology, and to provide a long-distance transportation of low-viscosity melt, which can increase the viscosity of the liquid phase near the spinning box. Device and method for producing PBT elastic filaments by melt direct spinning with shortest residence time distribution of highly viscous melt
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[0024] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0025] As shown in the figure: A device for producing PBT elastic filaments by melt direct spinning, including a slurry preparation tank 1, an esterification reactor 2, a preshrinkage reactor 3, a prepolymer filter 4, a prepolymerization The material cooler 5 and the final polymerization reactor 6, the low-viscosity melt discharge port provided in the middle of the final polymerization reactor 6 communicates with the melt filter 7 to filter the discharge to obtain a low-viscosity melt, and the melt is filtered The device 7 transports the low-viscosity melt to the liquid-phase thickening reactor 8 through the melt pump along the insulation pipeline. The temperature in the insulation pipeline is controlled at 220°C-250°C. The conveying pipe is connected with the feed port of the direct spinning device 9, and the feed port of the liquid phase thickening re...
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The invention discloses a device and a method for producing elastic PBT (polybutylene terephthalate) filaments by melt direct spinning. The device comprises a final polymerization reactor (6) and is characterized in that a low-viscosity melt discharging port and a melt filter (7) are arranged in the middle of the final polymerization reactor (6), the melt filter (7) delivers low-viscosity melt to a liquid phase tackifying reactor (8) along a heat preservation pipeline via a melt pump, and a discharging port of the liquid phase tackifying reactor (8) is communicated with a feeding port of a direct spinning device (9) directly via a delivering pipe. According to the method, the low-viscosity melt of the final polymerization reactor is delivered into the liquid phase tackifying reactor for tackifying and then delivered to the direct spinning device directly for spinning. Compared with a PBT chip spinning technology, the method for the PBT melt direct spinning has the advantages that energy consumption is reduced by 38%, technical processes are shortened greatly, the direct spinning device and a polyester chipper cannot be affected, and operational flexibility of the direct spinning device and the polyester chipper are improved.
Description
technical field [0001] The invention relates to the technical field of production of PBT elastic filaments, in particular to a melt direct spinning method in which low-viscosity melt is transported over a long distance, the viscosity of the liquid phase is increased near the spinning box, and the high-viscosity melt is distributed with the shortest residence time. A device and method for producing PBT elastic filaments. Background technique [0002] At present, all PBT spinning in the world adopts chip spinning process. Mainly, PTA and BDO are polymerized into a polyester melt with an intrinsic viscosity of about 1.0dl / g through a three-pot process, and PBT polyester chips are made into PBT polyester chips after casting, cooling, and pelletizing. Then the PBT polyester chips are dried, heated by the screw and then melted and extruded to the spinning box for the production of POY filaments. [0003] The disadvantage of the chip spinning process is that the PBT melt must go ...
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IPC IPC(8): D01D13/00D01F6/62
Inventor 俞新乐马健
Owner WUXI XINGSHENG NEW MATERIAL TECH