New textile fabric - polylactic acid fiber
Polylactic acid (PLA) is a novel biobased and renewable biodegradable material made from starch raw materials proposed by renewable plant resources such as corn and cassava.
The starch raw material is obtained by saccharification to obtain glucose, and then glucose and a certain strain are fermented to produce high-purity lactic acid, and then a certain molecular weight polylactic acid is synthesized by chemical synthesis. It has good biodegradability. After use, it can be completely degraded by microorganisms in nature under certain conditions, and finally produces carbon dioxide and water without polluting the environment. This is very beneficial to the environment and is recognized as an environmentally friendly material.
Polylactic acid fiber is made from starch-containing agricultural products such as corn, wheat, sugar beet, etc., after fermentation to produce lactic acid, and then made by polycondensation and melt spinning. Polylactic acid fiber is a raw material that can be planted, easily planted, and waste A synthetic fiber that naturally degrades in nature.
Polylactic acid fiber is rich in raw materials and can be recycled. Polylactic acid fiber has good biodegradability and can be completely decomposed into CO2 and H2O in nature after being discarded. Both through photosynthesis, they can become the raw material of lactic acid - starch. After the PLA fiber is buried in the soil for 2 to 3 years, the strength will disappear. If buried with other organic waste, it will decompose within a few months. In addition, polylactic acid is hydrolyzed into lactic acid by the acid or enzyme in the human body, and lactic acid is a metabolite of cells, which can be further metabolized by the enzyme to form carbon dioxide and water. Therefore, polylactic acid fibers also have good biocompatibility.
PLA fiber has good moisture absorption and moisture permeability, similar to the degradability, and the moisture absorption performance is also related to the morphological structure of the fiber. The longitudinal surface of the PLA fiber has irregular spots and discontinuous stripes, and there are holes or cracks, which are easy to form. The capillary effect thus exhibits a very good wicking phenomenon, with good water wettability and water diffusibility.
It has low flammability and certain flame retardancy; dyeing performance is worse than general textile fiber, it is not resistant to acid and alkali, easy to hydrolyze, especially pay attention to the influence of pH during dyeing process; It is easy to be photodegraded; after 500 hours of outdoor exposure, the PLA fiber can retain about 55% strength and has good weather resistance.
Polylactic acid fiber (PLA) is produced from corn starch. Therefore, this fiber is also called corn fiber, and can be produced by glucose fermentation using beet or grain to reduce the cost of preparing a lactic acid polymer. A high molecular weight polylactic acid can be obtained by chemical polymerization of a lactic acid cyclized dimer or direct polymerization of lactic acid.
The product obtained from polylactic acid has good biocompatibility and bioabsorbability, as well as bacteriostasis and flame retardancy, and PLA has the best heat resistance in the degradable thermoplastic polymer material.
Polylactic acid fiber can be decomposed into carbon dioxide and water through microbial action in soil or seawater. When burning, it will not emit toxic gas and will not cause pollution. It is a sustainable ecological fiber. The fabric has good hand feeling, drape, UV resistance, low flammability and excellent processing performance, and is suitable for various fashion, casual wear, sporting goods and sanitary products, and has broad application prospects.