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Spinning method of regenerated polyester full-dull FDY filaments

A technology of recycled polyester and full extinction, which is applied in the melting of filament raw materials, stretching spinning, and rayon manufacturing. Uniformity, the effect of ensuring uniformity

Inactive Publication Date: 2020-04-14
ZHEJIANG HAILI ENVIRONMENTAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Regenerated polyester full-dull FDY filament is a kind of differentiated fiber product, which can replace virgin polyester full-dull FDY filament, but there is no production method for recycled polyester full-dull FDY filament; the reason is: recycled polyester full-dull FDY The main raw material of the filament is recycled polyester bottle flakes, which has high impurity content and large difference in intrinsic viscosity. The ratio of added matting agent-titanium dioxide (TiO2) is high, reaching 1.5-3%. The masterbatch is evenly mixed, and bottle flakes and matt masterbatches with different melting points, viscosities, and properties are fully melted in the same screw at the same time to achieve normal spinning and the product meets the standard, which increases the difficulty of spinning

Method used

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  • Spinning method of regenerated polyester full-dull FDY filaments

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Experimental program
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Effect test

Embodiment 1

[0038] The recycled polyester bottle flakes are sent to a boiling continuous dryer for drying, with a crystallization temperature of 175°C, a drying temperature of 170°C, and a drying gas flow rate of 350m 3 / h, drying time 6h, bottle flake moisture content 35ppm; drying temperature of matt titanium dioxide masterbatch is 135℃, drying air flow rate is 80m 3 / h, the addition amount of the matting agent masterbatch is 4.5% (the content of titanium dioxide in the matting agent masterbatch is 50%); connect the dried regenerated polyester bottle flakes to the screw port, and add a masterbatch outside the screw feed port Port and a nitrogen addition port. The matting agent masterbatch and the regenerated bottle flakes are connected to the screw feed port synchronously. The nitrogen protective layer separates the air and the material before entering the screw; the temperature of the first to eighth areas of the screw are respectively It is 283℃, 288℃, 292℃, 298℃, 298℃, 295℃, 295℃, 295℃ ...

Embodiment 2

[0044] The recycled polyester bottle flakes are sent to a boiling type continuous dryer for drying. The crystallization temperature is 172°C, the drying temperature is 168°C, and the drying gas flow rate is 350m. 3 / h, drying time 6h, bottle flake moisture content 40ppm; drying temperature of matt titanium dioxide masterbatch is 133℃, drying air flow rate is 80m 3 / h, the addition amount of the matting agent masterbatch is 4.2% (the content of titanium dioxide in the matting agent masterbatch is 50%); connect the dried recycled polyester bottle flakes to the screw port, and add a masterbatch outside the screw feed port Port and a nitrogen addition port. The matting agent masterbatch and the regenerated bottle flakes are connected to the screw feed port synchronously. The nitrogen protective layer separates the air and the material before entering the screw; the temperature of the first to eighth areas of the screw are respectively 280℃, 285℃, 290℃, 295℃, 295℃, 295℃, 292℃, 292℃, t...

Embodiment 3

[0050] The regenerated polyester bottle flakes are sent to a boiling continuous dryer for drying. The crystallization temperature is 168℃, the drying temperature is 163℃, and the drying gas flow rate is 350m. 3 / h, drying time 6h, bottle flake moisture content 50ppm; matting masterbatch drying temperature is 128℃, drying air flow rate is 80m 3 / h, the addition amount of the matting agent masterbatch is 4.0% (the content of titanium dioxide in the matting agent masterbatch is 50%); connect the dried recycled polyester bottle flakes to the screw port, and add a masterbatch outside the screw feed port Port and a nitrogen addition port. The matting agent masterbatch and the regenerated bottle flakes are connected to the screw feed port synchronously. The nitrogen protective layer separates the air and the material before entering the screw; the temperature of the first to eighth areas of the screw are respectively 275℃, 280℃, 285℃, 290℃, 292℃, 292℃, 288℃, 288℃ to obtain recycled poly...

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Abstract

The invention provides a spinning method of regenerated polyester full-dull FDY filaments. The method comprises the following steps that A) a recycled old polyester bottle is pretreated to obtain regenerated polyester bottle pieces; B) after titanium dioxide dull master batches are dried, the titanium dioxide dull master batches and the regenerated polyester bottle pieces enter a screw rod to be melted so as to obtain a mixed melt; C) the mixed melt is homopolymerized after being subjected to primary filtration and then is subjected to secondary filtration; and D) the melt obtained in the stepC) is spun and then tow drawing is performed to obtain the regenerated polyester full-dull FDY filaments. The invention provides the spinning method of the regenerated polyester full-dull FDY filaments, the method can realize uniform mixing of polyester raw materials and the titanium dioxide dull master batches, the uniformity of the melt is ensured, finally the spinning process is smoothly carried out, and the performance of the filaments is ensured.

Description

Technical field [0001] The invention relates to the technical field of polyester recycling and reuse, in particular to a method for spinning regenerated polyester full-dull FDY filaments. Background technique [0002] Polyethylene terephthalate (polyester for short, PET) is a semi-crystalline polymer material, mainly used in the textile and plastic fields. There are differences in the characteristics of polyester raw materials for textiles and plastics: for example, in terms of viscosity, molecular weight, crystallinity, and transparency, both have traditionally been used in parallel. In the plastics field, a series of bottles, films, utensils and other products made from bottle-grade polyester chips as raw materials have many advantages such as high strength, good brightness, light weight, good transparency, easy processing, and stable dimensions. Therefore, global demand increase yearly. With the extensive use of polyester bottle materials, waste polyester bottle materials ha...

Claims

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Application Information

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IPC IPC(8): D01D1/10D01D1/06D01D1/04D01D5/16D01F6/84D01F1/10
CPCD01D1/04D01D1/065D01D1/106D01D5/16D01F1/10D01F6/84
Inventor 方叶青陈浩姚海鹤汤其明黄连华吴小林蔡忠华陈志锋陈建丰吴海良
Owner ZHEJIANG HAILI ENVIRONMENTAL TECH CO LTD
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