Self-enhanced polylactic acid fiber and preparation method thereof

Abstract

The invention relates to a self-enhanced polylactic acid fiber and a preparation method thereof. The self-enhanced polylactic acid fiber provided by the invention is a uniform mixture of a vertical compound crystal polylactic acid micro-fiber and a polylactic acid substrate. In 100 weight parts of self-enhanced polylactic acid fiber, 1-30 parts of vertical compound crystal polylactic acid micro-fiber and 70-99 parts of polylactic acid substrate are contained. The preparation method of the fiber comprises the following steps: firstly, respectively carrying out vacuum drying on PLLA (poly L lactic acid) and PDLA (poly D lactic acid); physically mixing PLLA with PDLA after being dried; fusing the mixture; collecting primary fibers under the conditions that a spinning temperature is 225-245 DEG C and a spinning speed is 500-2500 meters per minute; and thermally drafting and thermally shaping the primary fibers. Compared with the common polylactic acid fiber, the self-enhanced polylactic acid fiber disclosed by the invention has the advantages of higher constant temperature mechanical strength, higher high temperature mechanical strength and lower boiling water shrinkage, so that the use demand is met and the application field is expanded.

Description

technical field

[0001] The invention belongs to the technical field of polymer materials, and relates to a self-reinforced polylactic acid fiber and a preparation method thereof. Background technique

[0002] Polylactic acid (PLA) fibers are mainly made of natural renewable resources, which reduces the dependence on non-renewable resources such as petroleum, and at the same time has excellent mechanical properties and degradability. With people's increasing attention to the environment, the scale and cost reduction of PLA synthesis, and the continuous expansion of its application fields, PLA fiber will surely become one of the important fiber varieties, and it is expected to replace traditional polypropylene, polyester and nylon in many fields. Chemical fiber material.

[0003] Since the 1960s and 1970s, various spinning methods including wet method, dry method, dry-wet method and melt spinning have been successively used to prepare PLA fibers. Among them, melt spinning ha...