Method for decolorizing waste cotton-polyester blended fabric through cooperation of low-temperature plasma and chemical oxidation

By using a low-temperature plasma-assisted chemical oxidation method, the high energy consumption and pollution problems in the decolorization process of waste polyester-cotton blended textiles have been solved, achieving efficient and environmentally friendly decolorization treatment while maintaining fiber properties and enhancing reuse value.

CN122039468APending Publication Date: 2026-05-15FUZHOU UNIV
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Patent Information

Application Number
CN202610236130.8
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-02-27
Publication Date
2026-05-15

AI Technical Summary

Technical Problem

Existing decolorization technologies for waste polyester-cotton blended textiles suffer from high energy consumption, pollution, and damage to fiber properties, making it difficult to achieve efficient and environmentally friendly decolorization treatment.

Method used

A low-temperature plasma-assisted chemical oxidation method is adopted, which uses acidic chemical oxidants and a low-temperature plasma device to treat waste polyester-cotton blended textiles at room temperature and pressure. High-energy active particles and ultraviolet photons destroy the dye chromophores, while polar groups are introduced to improve the hydrophilicity of the fabric.

Benefits of technology

It achieves efficient decolorization with low energy consumption and no secondary pollution, maintains fiber structure and performance, simplifies the process, improves re-dyeing effect, and reduces equipment footprint and chemical reagent consumption.

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Abstract

The invention relates to a method for decolorizing waste cotton-polyester blended fabric through low-temperature plasma synergistic chemical oxidation. Through the synergistic effect of low-temperature plasma and an acidic chemical oxidant (composed of inorganic acid, hydrogen peroxide, a penetrant and a hydrogen peroxide stabilizer), color development and auxochrome groups of dye on the waste polyester-cotton blended fabric are effectively destroyed, and efficient decolorization of the waste polyester-cotton blended fabric is achieved. According to the technical scheme, the decolorizing efficiency is improved, the original performance of polyester and cotton fibers can be reserved, the secondary utilization performance of the recycled waste polyester-cotton mixed textile fabric is guaranteed, and an effective means is provided for resource utilization of the waste polyester-cotton mixed textile fabric. Compared with a traditional chemical oxidation technology, the method has the advantages that the required acid amount and treatment time are remarkably reduced, the temperature required by the reaction is greatly reduced, the environmental protection performance is remarkably improved, the energy consumption is reduced, and an economic and green new way is provided for recycling the waste polyester-cotton mixed textiles.
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