Hydrophilic modification method of polylactic acid fibers

Abstract

The invention discloses a hydrophilic modification method of polylactic acid fibers. The method has the beneficial effects that the hydrophility of the polylactic acid fibers can be improved to a large extent, so that the wearability of the polylactic acid fibers is substantially improved. The method comprises the following steps: (1) preparing a polylactic acid fiber pretreatment solution from 2 parts of hydroxypropyl methyl cellulose, 5-8 parts of malic acid, 0.2-0.5 part of trehalose and 100 parts of water by weight; (2) putting the polylactic acid fibers into the pretreatment solution to be treated at a constant temperature of 50-55 DEG C for 5-8 minutes, washing up the polylactic acid fibers and drying the polylactic acid fibers under normal temperature; (3) preparing a polylactic acid fiber treating solution from 1 part of hydroxypropyl methyl cellulose, 10 parts of citric acid and 100 parts of water by weight; (4) putting the polylactic acid fibers into the treating solution to be treated at a constant temperature of 50 DEG C for 15-20 minutes; (5) washing up the treated polylactic acid fibers and drying the polylactic acid fibers at 40 DEG C.

Description

technical field [0001] The invention relates to a method for hydrophilic modification of polylactic acid fibers, which belongs to the field of textiles. Background technique [0002] The main properties of polylactic acid are: origin from natural resources, complete biodegradability and low environmental load. However, compared with traditional materials, polylactic acid does not have an advantage in terms of physical properties, especially in thermodynamic properties. The glass ring transition temperature of polylactic acid is about 50000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000. At the same time, the crystallization speed of polylactic acid is slow and the degree of crystallinity is not high, resulting in a semi-crystalline or amorphous state of polylactic acid products after processing and molding. At room temperat...

AI Technical Summary

Problems solved by technology

However, when compared with traditional materials in terms of physical nature, polystumin does not dominate, especially thermodynamic properties. The temperature of the glass ring of polystumin is about about left and right, and the heat resistance is poor.

At the same time, the crystallization speed of polylactic acid is slow, and the degree of crystallinity is not high, resulting in a semi-crystalline or amorphous state of polylactic acid products after processing and molding. At room temperature, it is a hard and brittle thermoplastic material with poor impact resistance.

From a macro point of view, the disadvantages of polylactic acid are poor copper resistance and low heat deformation temperature. When used as a medical material, the balance between its degradation performance and service life must also be considered.

From a microscopic point of view, the microstructure of polylactic acid also limits its application. There are a large number of hydrophobic cool bonds in polylactic acid, which reduces the biocompatibility of polylactic acid, and the degradation cycle is difficult to control.

At the same time, the molecular weight distribution produced by the polylactic acid polymerization process is too wide, which makes the strength of the material often not meet the requirements