Auxiliary agent for dyeing superfine fiber synthetic leather with high color fastness and preparation method thereof

Abstract

The invention belongs to the technical field of superfine fiber synthetic leather, and particularly relates to an additive for dyeing of high-color-fastness superfine fiber synthetic leather and a preparation method thereof. The preparation method comprises the following steps: (1) modifying sepiolite fibers; (2) acidifying chitosan, and mixing the chitosan with the modified sepiolite fibers in the step (1); (3) dropwise adding a NaOH solution into the mixture system in the step (2) in a stirring process to adjust the pH to be 8-12, and continuously stirring the solution for 30-60 min to obtain the additive for superfine fiber synthetic leather dyeing. According to the preparation method disclosed by the invention, the chitosan covers the surfaces of the modified sepiolite fibers; a relatively large amount of hydroxide radical and amino in a molecular structure of the chitosan can form a relatively large number of hydrogen bonds with the fibers to achieve a relatively good bonding effect, so that the bonding efficiency of the additive and the superfine fiber synthetic leather is improved, and the problems that the dye uptake cannot be guaranteed and the washing fastness is low dueto a small number of active groups on the surface of the fiber of the superfine synthetic leather are solved.

Description

technical field [0001] The invention belongs to the technical field of ultrafine fiber synthetic leather, and in particular relates to an auxiliary agent for dyeing ultrafine fiber synthetic leather with high color fastness and a preparation method thereof. Background technique [0002] The resources of natural leather are limited, and it is easy to produce pollution during the production process. Therefore, the development and utilization of imitation synthetic leather with excellent performance has gradually been paid attention to. Among them, the superfine fiber synthetic leather obtained by impregnating polyurethane with superfine fiber nonwoven fabric with a three-dimensional network structure as the reinforcing material is excellent in terms of internal microstructure, appearance texture, physical properties and people's wearing comfort. Close to the natural leather. While the processing technology of ultra-fine fiber synthetic leather is developing rapidly, there are...

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Problems solved by technology

[0003] From the perspective of components, microfiber synthetic leather mainly includes two parts: superfine fiber nonwoven fabric and impregnated and filled polyurethane. The structures and properties of these two components are very different. The dyeing requirements of the two components are difficult to achieve a good dyeing effect at the same time; in addition, there are few active groups on the ultrafine fiber synthetic leather fiber, there are a large number of carbon chains and amide groups in the middle of the molecular chain, and there are no side chains. Only the end of the molecular chain has carboxyl and amino groups. When dyeing, it mainly relies on the deposition of the dye itself to color the fiber. Therefore, most dyes are difficult to dye, and their washing fastness is poor, and it is difficult to achieve the effect of dyeing.

[0004] Due to the difficulty and high cost of dyeing microfiber synthetic leather, most microfiber synthetic leathers are not dyed, but artificial coatings are made on the white microfiber synthetic leather base cloth and processed into finished products. The appearance and luster of this product comes from the artificial coating. Products made of this superfine fiber synthetic leather, such as shoes and sofas, are easy to wear and tear through the artificial coating during use, which seriously affects the product. performance, thus restricting the development of microfiber synthetic leather

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