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Method for preparing medium-viscosity PET slice by recycled low-viscosity polyester yarn

A technology for slicing and polyester fabrics, which is applied in the field of producing medium and high viscosity PET spinning chips, which can solve the problems of poor strength, low viscosity, and lower market value of high-viscosity PET, and achieve the effect of simple processing methods

Inactive Publication Date: 2010-03-03
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0024] At present, there is a huge amount of recycled PET fiber in the market, but due to its low viscosity and poor strength, it can no longer be directly used as a normal spinning raw material, and can only be used after being mixed with high-viscosity PET.
But this approach reduces the market value of high-viscosity PET

Method used

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  • Method for preparing medium-viscosity PET slice by recycled low-viscosity polyester yarn
  • Method for preparing medium-viscosity PET slice by recycled low-viscosity polyester yarn
  • Method for preparing medium-viscosity PET slice by recycled low-viscosity polyester yarn

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Recycled low-viscosity polyester fibers or polyester fabric fragments PET materials are sorted, cleaned, placed in a blast oven at 160°C and dried for 4 hours, then put into the hopper of the extruder and wait for extrusion. The modified MDI (containing 28wt% isocyanate) and the dried PET were fed into an extruder at a mass ratio of 1:100 for melt extrusion. Viscosity-enhancing chain-extending agent is accurately metered by metering pump. The temperature of each section of the barrel during the extrusion process is:

[0037]

[0038] After the extruded PET was cooled in a cooling water tank, it was pelletized by a pelletizer to obtain sliced ​​samples. The result after the test is: the intrinsic viscosity is increased from 0.4dL / g of the raw material to 0.65dL / g.

Embodiment 2

[0040] Add polyethylene glycol-500 to MDI to make a viscosity-increasing chain extender with polyethylene glycol in the middle and isocyanate at both ends. Afterwards, according to the conditions of Example 1, the intrinsic viscosity of the PET chip was increased from 0.4dL / g to 0.6dL / g.

Embodiment 3

[0042] After cleaning and compacting the recovered low-viscosity polyester fiber or polyester fabric scrap PET material, PET raw material particles are obtained, and after drying in a blast oven at 130°C for 12 hours, the modified MDI containing 18wt% isocyanate is passed through a metering pump Added to the extruder at 1.2% of the PET feed. The temperature of each section of the barrel during the extrusion process is:

[0043]

[0044] After extrusion, it is water-cooled and pelletized. After testing, the intrinsic viscosity is increased from 0.64dL / g of the raw material to 0.85dL / g. Other properties of the test are

[0045]

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Abstract

The invention provides a method for preparing a medium-viscosity PET slice through adding a viscosified chain extender during the process that a double-screw extruder smelts and extrudes recycled low-viscosity polyester fiber or polyester fabric fragments to carry out smelting, chain extension and extrusion reaction. The method enables the viscosity of PET to be enhanced through the following steps: taking the recycled low-viscosity terylene fiber or the polyester fabric fragments as a raw material, adding the viscosified chain extender, enabling the raw material and the chain extender to react in the extruder, and then extruding the reaction products to increase the viscosity of the PET. Through changing processing conditions and reaction proportion, the PET slices with different viscosity can be obtained. The products obtained by the invention can be used for industrial yarns, such as carpets, filature and the like and can serve as the raw materials of textile fabrics.

Description

technical field [0001] The invention relates to a method for processing recycled low-viscosity polyester fibers or polyester fabric fragments to obtain medium-viscosity PET slices, specifically, using a twin-screw extruder to add viscosity-increasing expansion to low-viscosity polyester fibers that have been compacted or crushed afterward. The method of reactive extrusion after chain agent to increase its intrinsic viscosity can be used to produce medium and high viscosity PET spinning chips. The densification treatment mentioned here refers to washing the recovered PET and heating it at a certain temperature to melt the surface into balls to form 2-20mm spheres, which is convenient for accurate feeding and increased production. Background technique [0002] Since PET (polyethylene terephthalate, commonly known as polyester) was industrialized by DuPont in 1953, due to its good physical processing performance and the cost-effective advantages reflected in the cost reduction ...

Claims

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Application Information

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IPC IPC(8): C08J11/28C08J11/22C08L67/02D01F6/62
CPCY02W30/62
Inventor 王庆海潘泳康唐颂超刘勇赵涛
Owner EAST CHINA UNIV OF SCI & TECH
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