Degradation-promoting and degradation-period-controllable environment-friendly synthetic fiber and preparation method thereof

The invention discloses a preparation method of an environment-friendly synthetic fiber capable of promoting degradation and controlling a degradation period. The environment-friendly synthetic fiber comprises the following components in parts by weight: 100-200 parts of polycaprolactone, 200-300 parts of polylactic acid and 25-75 parts of poly (aspartic acid-glutamic acid-lactic acid-caprolactone). According to the invention, the morpholine diketone monomer prepared based on natural aspartic acid, glutamic acid and derivatives thereof is used for copolymerization modification of polycaprolactone and polylactic acid, so that the synthetic fiber has the capability of regulating and controlling the degradation rate, and can be gradually and naturally degraded when being discarded and not used; therefore, the potential influence on the marine ecological environment due to long-term existence in the marine environment can be avoided. 本发明公开了一种促降解且降解周期可控的环保合成纤维的制备方法，包括聚己内酯100～200重量份、聚乳酸200～300重量份、聚(天冬氨酸-谷氨酸-乳酸-己内酯)