Preparation method of reproduced cotton-like polyester fiber capable of being dyed by cationic dye

A technology of cationic dyes and cotton polyester fibers, which is applied in the field of polyester synthesis, can solve the problems that limit the large-scale popularization and application of polyester chemical recycling and regeneration methods, the difficulty of separation and purification of degradation products, and the disadvantages of spinning and dyeing stability. Low cost, excellent cationic dyeing performance, favorable spinning effect

Active Publication Date: 2020-05-01
ZHEJIANG HENGYI PETROCHEMICAL RES INST CO LTD
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AI Technical Summary

Problems solved by technology

Chemical method: mainly through hydrolysis, methanolysis, ethylene glycol alcoholysis and other methods, the waste polyester is decomposed into polyester raw materials or intermediates through chemical treatment, so as to achieve the purpose of repeated use, but the chemical method requires high technology , Recycling costs are high, which limits the large-scale application of polyester chemical recycling and regeneration methods
[0004] Invention patent CN 107652422A discloses a method for preparing regenerated cationic dyeable polyester by alcoholysis of waste polyester, the method is through alcoholylysis of waste polyester and then with isophthalic acid-5-sodium sulfonate and polyethylene glycol Alcohol is used to prepare regenerated cationic dyeable polyester fibers. The disadvantage of this method is that the content of diethylene glycol in the prepared cationic dyeable polyester fibers is as high as 5.5±0.3%, and the melting point is low, which is not conducive to spinning and dyeing stability.
Invention patent CN 103132175A discloses a regeneration-based cationic dyeable polyester filament and its preparation method, which uses a composite catalyst to depolymerize waste polyester to obtain high-yield ethylene terephthalate (BHET) by adding treated The isophthalic acid-5-sodium sulfonate slurry is polymerized in situ to prepare dyeable polyester with regenerated cationic dyes. The disadvantages of this scheme are that the process flow is long and complicated, the separation and purification of degradation products (BHET) are difficult, and the modification High monomer usage (0.5%-10%), resulting in higher cost of recycled products

Method used

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Examples

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preparation example Construction

[0032] A kind of preparation method of the regenerated cotton-like polyester fiber that cationic dye can dye, comprises the following steps:

[0033] 1) Preparation of modified tri-monomer esterification product: sodium pentasulfonate isophthalate, dimethyl isophthalate-5-sodium benzenesulfonate or a mixture of the two and ethylene glycol in a mass ratio of 1: 1.5-1.8 into the reactor for esterification reaction, the reaction temperature is 160-190 ° C, the reaction time is 1-2h; then add 0.8-1.2 wt% of the mixture of polyethylene glycol (molecular weight is 1000, 2000 or 4000) , continue the transesterification reaction for 2-5 hours, then stop heating, cool and discharge, and pulverize to obtain a powdery three-monomer esterified product. Preferably, a sodium chloride solution may be added before the esterification reaction, and sodium chloride accounts for 1-5 wt% of the mixture. Sodium chloride is pretreated: disperse isobutyltriethoxysilane in distilled water so that its...

Embodiment 1

[0038]Preparation of modified tri-monomer esterification product: Put sodium isophthalic acid-5-sulfonate and ethylene glycol into the reactor at a mass ratio of 1:1.5 for esterification reaction, the reaction temperature is 170°C, and the reaction time is 2 hours; Then add polyethylene glycol (0.8% relative to the quality of isophthalic acid-5-sodium sulfonate, the molecular weight is 2000), continue the transesterification reaction after 3.5h, stop heating, cool and discharge, and pulverize to obtain powdery three single body esters.

[0039] The waste polyester bottle flakes are sorted, cleaned, impurity removed, cut, crushed, and then dried. The dried polyester chips, tri-monomer esterified product powder, and reaction auxiliary toluene diisocyanate are mixed in a mass ratio of 285:3:0.1 Add to a high-speed mixing mixer and mix well. Put the evenly mixed slices into the hopper of the automatic feeder, and melt, react and extrude through the reaction screw extruder. 230°C...

Embodiment 2

[0041] Preparation of modified tri-monomer esterification product: Put sodium isophthalic acid-5-sulfonate and ethylene glycol into the reactor at a mass ratio of 1:1.5 for esterification reaction, the reaction temperature is 170°C, and the reaction time is 2 hours; Then add polyethylene glycol (1.2% relative to the quality of isophthalic acid-5-sodium sulfonate, the molecular weight is 2000), stop heating after continuing the transesterification reaction for 5h, cool and discharge, and pulverize to obtain a powdery three-monomer Ester.

[0042] Wash, remove impurities, cut off waste polyester waste silk, dry it, and add three-monomer esterified product powder and reaction auxiliary phthalic anhydride into a high-speed stirring mixer at a mass ratio of 285:3:0.5 and mix evenly. Put the evenly mixed slices into the hopper of the automatic feeder, and melt, react and extrude through the reaction screw extruder. 230°C, the vacuum degree of the polycondensation section is -0.1Mpa...

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Abstract

The invention relates to the field of polyester synthesis, and discloses a preparation method of a reproduced cotton-like polyester fiber capable of being dyed by cationic dye. The preparation methodcomprises the steps: 1) carrying out an esterification reaction on isophthalic acid sodium pentasulfonate, dimethyl isophthalate-5-sodium benzenesulfonate or a mixture of the isophthalic acid sodium pentasulfonate and the dimethyl isophthalate-5-sodium benzenesulfonate and ethylene glycol, and then adding polyethylene glycol to react, thus acquiring a trimonomer ester; 2) sorting and crushing therecycled polyester; 3) uniformly mixing the recycled polyester with a reaction auxiliary, and then mixing with the trimonomer ester, melting and extruding to prepare a regenerated polyester slice; and4) spinning. According to the method, the recycled polyester does not need to be degraded, the modified trimonomer ester and the reaction auxiliary are ingeniously utilized to directly react with therecycled polyester to prepare the regenerated polyester; the method has the advantages of simple process and low cost; and polyester molecular chains have modified trimonomer ester blocks, so that the fiber has excellent moisture regain and cationic dyeing effect, and achieves the cotton-like effect.

Description

technical field [0001] The invention relates to the field of polyester synthesis, in particular to a method for preparing regenerated cotton-like polyester fibers dyeable by cationic dyes. Background technique [0002] Polyethylene terephthalate (PET), as the most widely used synthetic resin in the world, is widely used in beverage bottles, chemical fibers, films, sheets and other fields. In the past ten years, the global demand for polyester has increased sharply, and the scale and number of polyester production enterprises have maintained rapid growth. In 2018, domestic polyester production exceeded 50 million tons. Polyester production not only needs to consume a large amount of precious petroleum resources, but also with the rapid increase in the consumption of polyester products, the impact of various waste polyester products and polyester waste on the environment The problem of pollution has become increasingly prominent. Therefore, recycling polyester products can n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F6/84C08G63/688
CPCD01F6/84C08G63/6886
Inventor 胡舒龙胥荣威闫明
Owner ZHEJIANG HENGYI PETROCHEMICAL RES INST CO LTD
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