Method for preparing yellow azo dyes by degrading waste polyester fibers

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...

Images