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Preparation method of self-curling regenerated polyester staple fiber

A technology for regenerated polyester and staple fibers, which is applied in the field of self-crimping regenerated polyester staple fibers and the preparation of self-crimping regenerated polyester staple fibers, can solve problems such as affecting spinnability, achieve excellent smoothness, good film-forming properties, and widen applications field effect

Pending Publication Date: 2022-03-15
ZHEJIANG SCI TECH UNIV SHAOXING KEQIAO RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when high and low viscosity PET is used to produce side-by-side composite fibers, due to the large difference in viscosity between the two, elbows are prone to occur and affect spinnability.

Method used

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  • Preparation method of self-curling regenerated polyester staple fiber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A kind of preparation method of self-crimping regenerated polyester staple fiber of the present embodiment comprises the following steps: 1) Preparation of undrawn tow: Repolymerize the monomers recovered by waste textiles through ethylene glycol alcoholysis and methanol transesterification The regenerated PET with an intrinsic viscosity of 0.505dL / g is the low-viscosity component A, and the regenerated PET with an intrinsic viscosity of 0.910dL / g after the low-viscosity recycled PET is thickened in the solid phase is the high-viscosity component B. Screw extruder, control the temperature of each zone of the high-viscosity B and low-viscosity A two-component screw extruder to 290-310°C and 260-280°C, and the temperature of the die head to 310°C, using a double-layer co-extrusion die head, Obtain a composite film extruded side by side by two kinds of polymers, in which the side of the high-viscosity B component is close to the cooling drum on the lower layer to obtain a f...

Embodiment 2

[0020] A kind of preparation method of self-crimping regenerated polyester staple fiber of the present embodiment comprises the following steps: 1) Preparation of undrawn tow: Repolymerize the monomers recovered by waste textiles through ethylene glycol alcoholysis and methanol transesterification The regenerated PET with an intrinsic viscosity of 0.510dL / g is the low-viscosity component A, and the regenerated PET with an intrinsic viscosity of 0.910dL / g after the low-viscosity recycled PET is thickened in the solid phase is the high-viscosity component B. Screw extruder, control the temperature of each zone of the high-viscosity B and low-viscosity A two-component screw extruder to 290-310°C and 260-285°C, and the temperature of the die head to 310°C, using a double-layer co-extrusion die head, Obtain a composite film made of two polymers extruded side by side, in which the high-viscosity side is in the lower layer and the cooling drum is in close contact to obtain a film with...

Embodiment 3

[0024] A kind of preparation method of self-crimping regenerated polyester staple fiber of the present embodiment comprises the following steps: 1) Preparation of undrawn tow: Repolymerize the monomers recovered by waste textiles through ethylene glycol alcoholysis and methanol transesterification The regenerated PET with an intrinsic viscosity of 0.515dL / g is the low-viscosity component A, and the regenerated PET with an intrinsic viscosity of 0.910dL / g after the low-viscosity recycled PET is thickened in the solid phase is the high-viscosity component B. Screw extruder, control the temperature of each zone of the high-viscosity B and low-viscosity A two-component screw extruder to 290-310°C and 260-290°C, and the temperature of the die head to 310°C, using a double-layer co-extrusion die head, Obtain a composite film made of two polymers extruded side by side, in which the high-viscosity side is close to the cooling drum on the lower layer to obtain a film with a thickness of...

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Abstract

The invention discloses a preparation method of self-curling regenerated polyester staple fibers, which comprises the following steps: 1) preparing undrawn tows, and preparing the undrawn tows; and 2) post-processing the undrafted tows to obtain the self-crimping regenerated polyester staple fibers with the specification of 1.33-13.3 dtex / 38-64 mm. According to the invention, the high-viscosity and low-viscosity regenerated PET is used for producing the short fiber with the self-curling characteristic, so that the application field of the regenerated PET is widened, and the additional value of the product is improved; secondly, a polymer double-layer co-extrusion method is adopted, so that good film-forming property can be ensured, the thickness of a thin film and the width of filaments can be flexibly controlled, and the specification of fibers can be adjusted; and thirdly, the prepared self-crimp regenerated polyester staple fiber not only has better crimp rate and compression elasticity recovery rate, but also has excellent smoothness among single fibers due to the flat section.

Description

technical field [0001] The invention relates to a preparation method of self-crimping regenerated polyester staple fiber, which belongs to the field of novel chemical fibers. More specifically, the recycled high intrinsic viscosity and low intrinsic viscosity polyethylene terephthalate (PET) is used as a raw material, and the double-layer co-extrusion method is used to first extrude the polymer into a film, cut , plied and merged into the silk barrel, and then stretched, heat-set, crimped, cut, packaged and other processes are carried out on the staple fiber post-processing equipment to obtain self-crimped recycled polyester staple fiber. Background technique [0002] There are two main ways to produce self-crimping fibers (or three-dimensional crimping fibers): one is to produce single-component three-dimensional crimping fibers through specially designed spinneret holes and asymmetric cooling methods; the other is to produce them by side-by-side or eccentric compounding B...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01D5/42D01D5/12D01D10/02D01D5/22D01F8/14D01D5/26
CPCD01D5/426D01D5/12D01D10/02D01D5/22D01F8/14D01D5/26
Inventor 沈觉鸣王杰王秀华
Owner ZHEJIANG SCI TECH UNIV SHAOXING KEQIAO RES INST CO LTD