According to the phenomena of decreasing size stability, increasing shrinkage and decreasing crease resistance of Lyocell bamboo fiber and its blended products, this project adopts chemical method to carry out functional finishing on Lyocell bamboo fiber and its blended products by analyzing and studying its microstructure, molecular morphology structure and physical and chemical properties, combining with fabric anti-shrinkage and crease resistance mechanism, so as to reduce shrinkage and wrinkle phenomenon, improve size stability, solve the problems that mechanical finishing can not change its easy deformation, etc. At the same time, it can also improve the excessive fibrillation of lyocell bamboo fiber. Develop new ecological and environmentally friendly Lyocell bamboo fiber functional finishing and processing technologies with stable processing performance, mild action, and can maintain and improve the original excellent properties of Lyocell bamboo fiber and its blended products. The research content of this project is as follows:

1. The chemical structure, morphological structure, microstructure, etc. of bamboo fiber were characterized and analyzed by infrared spectroscopy, X-ray diffraction, optical electron microscopy, etc. At the same time, the physical and mechanical properties of bamboo fibers, including the initial modulus, moisture absorption properties, breaking strength, elongation at break, etc., were also discussed, and the relationship between bamboo fiber structure and properties was analyzed, which provided a theoretical basis for the development and application of functional finishing technology of Lyocell bamboo fibers and their blends.

2. Based on the principle that pretreatment of bamboo fibers with biological enzymes can decompose non-cellulosic impurities in bamboo fibers, reduce the initial modulus, improve elasticity, and cause less damage to the fibers, combined with the performance characteristics of Lyocell bamboo fibers, this topic uses the synergistic effect of single or composite biological enzymes and adding appropriate amount of alkali to pretreatment Lyocell bamboo fibers, replacing the traditional alkali desizing process. The effects of enzyme concentration, pH value, temperature, treatment time, activator concentration and enzyme decomposition rate on the desizing effect were studied. The biological enzyme desizing process was determined. Combined with the bleaching process, Lyocell bamboo fiber ecological pretreatment processing technology was developed. The wool efficiency and whiteness of the treated fabric were significantly improved, and the mechanical properties of the fabric were not significantly changed, and it was environmentally friendly.

3. Combined with the principle of fabric shrink-proof and anti-wrinkle, a resin finishing agent is introduced to cross-link with fiber macromolecules containing active groups to form a stable network structure inside the fiber, reduce the relative movement and sliding between fiber macromolecules, and make the fiber The relative position is relatively stable, and the fiber is not prone to large displacements. In this paper, ultra-low formaldehyde resin finishing agent KNITTEX 7636 was used to carry out shrink-resistant and crease-resistant finishing of Lyocell bamboo fiber fabric. The effects of finishing agent amount, baking temperature, baking time, addition of agent and formaldehyde release on the resin finishing effect were discussed, and the optimal process conditions were determined.

4. After being treated with resin finishing agent, the size stability of Lyocell bamboo fiber fabric has been greatly improved, and the shrinkage in the warp and weft directions can be kept below 2%; the crease recovery angle (warp + weft) is 261°, and the formaldehyde emission on the fabric is less than 8ppm. At the same time, after adding a softener, the softness and elasticity of the fabric will be improved accordingly, the bending rigidity will be reduced, and the fabric will be soft and comfortable to feel. Moreover, the resin treatment will have no significant impact on the breaking strength and whiteness of Lyocell bamboo fiber fabric.