High-toughness polylactic acid material, preparation method and film

Abstract

The invention belongs to the technical field of polylactic acid films, and discloses a high-toughness polylactic acid material, a preparation method and a film, the high-toughness polylactic acid material uses raw materials of polylactic acid, a polylactic acid copolymer, hydroxyl-terminated epoxidized trans-1, 4-polyisoprene (HEEUG) and an epoxy group chain extender, has good biodegradability and mechanical properties, is safe and non-toxic, is environment-friendly, and can be used for preparing a high-toughness polylactic acid film. And the processing performance is good. In the melt blending extrusion process, the HEEUG and the polylactic acid are subjected to polycondensation and chain extension reaction, and the compatilizer among the components is increased by the polylactic acid copolymer, so that the strength of the polylactic acid film is jointly improved; by adding the low-molecular-weight HEEUG, the motion ability of PLA molecular chains can be improved, the interchain entanglement effect can be reduced, HEEUG long-chain molecules are uniformly dispersed in a system and serve as a bridge, stress conduction can be well improved, the molecular chains can move more easily, the plasticizing effect is achieved, the PLA molecular chains are easy to orient under the action of force, and the mechanical properties of the PLA are improved. The epoxy group chain extender can promote the molecular chain flexibility effect, and the elongation at break is greatly improved.