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Method for preparing yellow azo dyes by degrading waste polyester fibers

A technology of yellow azo and waste polyester, applied in the direction of azo dyes, monoazo dyes, organic dyes, etc., can solve the problems of soil ecological balance destruction, air and water pollution, etc.

Active Publication Date: 2014-09-03
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the polyester material itself does not pollute the environment, landfill and incineration are generally used to dispose of waste polyester. Polyester is difficult to degrade in the natural environment and may easily cause damage to the ecological balance of the soil. The smoke and dust generated during combustion and secondary Pollution of air and water by oxins

Method used

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  • Method for preparing yellow azo dyes by degrading waste polyester fibers

Examples

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Effect test

Embodiment 1

[0021] (1) Ethylene glycol degradation of waste polyester: heat and dissolve 2 parts by weight of zinc acetate in 400 parts by weight of ethylene glycol, add 100 parts by weight of waste polyester after cleaning, drying and crushing, and heat to 198 ° C for 3 hours , continuous stirring and nitrogen protection are required during the reaction. After the reaction, under the environment of nitrogen protection and condensed water circulation, the mixed solution was cooled to below 140°C, and then removed for later use. Dilute the cooled mixed solution into deionized water at 90°C, vacuum filter, cool and crystallize the filtrate, repeat the above operation 3 times, and dry in vacuum at 55°C for 24 hours to obtain the degradation product BHET monomer with a purity of 97%. The rate is 91.0%.

[0022] (2) Nitrification reaction of BHET:

[0023] Mix 1 part by weight of the BHET monomer obtained in step (1) with 0.4 parts by weight of concentrated sulfuric acid at 6°C and stir even...

Embodiment 2

[0035] (1) Ethylene glycol degradation of waste polyester: heat and dissolve 1.5 parts by weight of zinc acetate in 300 parts by weight of ethylene glycol, add 100 parts by weight of waste polyester after cleaning, drying and crushing, and heat to 196 ° C for 4.5 hours , continuous stirring and nitrogen protection are required during the reaction. After the reaction, under the environment of nitrogen protection and condensed water circulation, the mixed solution was cooled to below 140°C, and then removed for later use. Dilute the cooled mixed solution into deionized water at 90°C, vacuum filter, cool and crystallize the filtrate, repeat the above operation 3 times, and dry in vacuum at 55°C for 24 hours to obtain the degradation product BHET monomer with a purity of 96%. The rate is 89.8%.

[0036] (2) Nitrification reaction of BHET:

[0037]Mix 1 part by weight of the BHET monomer obtained in step (1) with 0.5 parts by weight of concentrated sulfuric acid at 5°C and stir e...

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Abstract

The invention relates to a method for preparing yellow azo dyes by degrading waste polyester fibers. The method comprises the following technological steps: (1) degrading waste polyester fibers by glycol, thereby obtaining a product bis(2-hydroxyethyl) terephthalate; (2) nitrifying and restoring the BHET, thereby obtaining ABHET (Amino bis(2-hydroxyethyl) terephthalate); and (3) preparing azo dyes by carrying out diazo coupling on the ABHET. The invention relates to the technical fields of solid waste treatment, polyester degradation, textile dyeing and finishing and the like. The waste polyester fibers are degraded by glycol to obtain the BHET, and then a series of azo dyes are prepared by the reactions of restoring, diazo coupling and the like, so that the waste polyester fibers are recycled effectively. The type of azo dyes can be used for dyeing synthetic fibers and textiles thereof, such as chinlon and dacron.

Description

technical field [0001] The invention relates to a method for preparing yellow azo dyes by degrading waste polyester fibers, and belongs to the technical fields of solid waste treatment, polyester degradation, textile printing and dyeing, and the like. Background technique [0002] As a polymer material, polyester is widely used in textile, electronics, packaging, engineering and other industries and fields because of its good thermal properties, mechanical properties, stability and non-toxicity. Although the polyester material itself does not pollute the environment, landfill and incineration are generally used to dispose of waste polyester. Polyester is difficult to degrade in the natural environment and may easily cause damage to the ecological balance of the soil. The smoke and dust generated during combustion and secondary Dioxins, etc. pollute the air and water sources. At the same time, petroleum resources are increasingly scarce as raw materials for the production of...

Claims

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Application Information

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IPC IPC(8): C09B29/50
Inventor 葛明桥李梦娟余天石黄艳红陈世明
Owner JIANGNAN UNIV
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