Method for preparing polyester staple fibers by using waste polyester raw material

A polyester staple fiber and polyester technology, which is applied in the field of polyester staple fiber preparation by using waste polyester raw materials, can solve the problems of low processing efficiency, molecular weight reduction, high-new material ratio, etc., so as to improve processing efficiency, avoid gel phenomenon, and ensure The effect of linearity

Inactive Publication Date: 2012-07-18
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to avoid the reduction of molecular weight during the processing and use of polyester, solid-state polycondensation or mixed use of recycled materials and virgin materials is mostly used. Th

Method used

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  • Method for preparing polyester staple fibers by using waste polyester raw material

Examples

Experimental program
Comparison scheme
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Example Embodiment

[0017] Example 1:

[0018] The waste polyester raw material used is waste pure polyester textiles (intrinsic viscosity 0.5g / dl). The following process conditions are used to prepare recycled polyester fiber:

[0019] (1) Preparation of raw materials: cleaning waste polyester textiles to remove stains, and the cleaning conditions are: synthetic detergent 5g / l, sodium tripolyphosphate 5g / l, caustic soda 0.8g / l, temperature 90°C. The washed waste polyester textiles are dried in a hot-air dryer for 5 hours. After the moisture content is reduced to 0.1%, the waste polyester raw materials are compressed in a semi-molten state at 235° C. to prepare spherical pellets.

[0020] (2) Melt preparation and spinning: transport the pellets prepared in step (1) to a drying device for drying at 120°C for 30 minutes, and then drying at 140°C for 6 hours. After drying, the moisture content is 30 ppm, and then press the pellets Add 0.5% of the mass of 1,4-phenylbisoxazoline (1,4-PBO) and carbonyl bis(...

Example Embodiment

[0022] Example 2:

[0023] The waste polyester raw material used is the waste yarn (intrinsic viscosity 0.6g / dl) produced during the spinning process of polyester. The following process conditions are used to prepare recycled polyester fiber:

[0024] (1) Preparation of raw materials: cleaning waste polyester textiles to remove stains, and the cleaning conditions are: synthetic detergent 5g / l, sodium tripolyphosphate 5g / l, caustic soda 0.8g / l, temperature 90°C. The washed waste polyester textiles are dried in a hot-air dryer for 5 hours. After the moisture content is reduced to 0.1%, the waste polyester raw materials are compressed in a semi-molten state at 235° C. to prepare spherical pellets.

[0025] (2) Melt preparation and spinning: transport the pellets prepared in step (1) to a drying device for drying at 140°C for 10 minutes, and then drying at 170°C for 3 hours. After drying, the moisture content is 40ppm, and then according to the pellet quality Add 3% of the 1,4-phenylbi...

Example Embodiment

[0026] Example 3:

[0027] The waste polyester raw material used is waste pure polyester textiles (intrinsic viscosity 0.52g / dl). The following process conditions are used to prepare recycled polyester fiber:

[0028] (1) Preparation of raw materials: cleaning waste polyester textiles to remove stains, and the cleaning conditions are: synthetic detergent 5g / l, sodium tripolyphosphate 5g / l, caustic soda 0.8g / l, temperature 90°C. The washed waste polyester textiles are dried in a hot-air dryer for 5 hours. After the moisture content is reduced to 0.1%, the waste polyester raw materials are compressed in a semi-molten state at 235° C. to prepare spherical pellets.

[0029] (2) Melt preparation and spinning: transport the pellets prepared in step (1) to a drying device for drying at 130°C for 20 minutes, and then drying at 160°C for 4 hours. After drying, the moisture content is 45 ppm, and then press the pellets Add 2.5% of the mass of carbonyl bis(1,-caprolactam) (CBC) polyester chai...

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Abstract

The invention discloses a method for preparing polyester staple fibers by using a waste polyester raw material. The method comprises the following steps of: cleaning and drying waste polyester, and performing compression aggregation and granulation; drying, conveying into a reaction type vented screw extruder, and adding phenyl bis-oxazoline and N, N'-carbonyl bis-caprolactam polyester chain extenders which are 0.5 to 3 mass percent of granules; conveying the polyester granules and the chain extenders to the reaction type vented screw extruder together, melting and mixing; and weighing a melt and conveying to a spinning unit to prepare the polyester staple fibers. The degradation of the waste polyester in the processing and using processes can be improved, the molecular weight of the waste polyester is improved, and the processing efficiency and fiber quality of the polyester fibers are improved. The prepared polyester fibers can be used for filling materials of clothing and furniture fabrics, geotextiles, roofing felt base cloth, nonwoven fabrics of insulating materials, shoe covers, wiping cloth and several disposable nonwoven products.

Description

technical field [0001] The invention relates to a method for preparing polyester staple fiber, in particular to a method for preparing polyester staple fiber by using waste polyester raw materials. Background technique [0002] Thermoplastic polyesters include major varieties such as fiber grade, bottle grade and film grade polyester by application. In 2010, the demand for fiber-grade and bottle-grade polyester in my country exceeded 23 million tons, and maintained a certain growth rate, especially for bottle flake polyester used in food packaging, medicine, and daily chemical packaging. rate exceeded 15%. The rapid development of the polyester industry has also brought an unavoidable problem to the world: raw material sources and waste disposal. There are about 2% waste in polyester fiber processing, waste after use of fiber products, and one-time use of food packaging polyester produce a large amount of waste polyester raw materials. [0003] Since the 1980s, countries a...

Claims

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Application Information

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IPC IPC(8): D01F6/84
Inventor 朱海霖张华鹏陈建勇唐红艳郭玉海
Owner ZHEJIANG SCI-TECH UNIV
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