| abstract |
The invention discloses a polylactic acid composite material and its application, comprising components: (A) 89-98 parts by weight of polylactic acid; (B) 1-4 parts by weight of talcum powder; (C) 1-7 parts by weight plasticizer; wherein, in the component (A), the polydispersity index P of polylactic acid satisfies the following relationship: 1.55≤P≤2.02; in the component (B), the particle size D of talc powder (50 ) satisfy: 1μm≤D (50) ≤2.6μm, in the component (C), the relative molecular weight M of the plasticizer satisfies: 180≤M≤670. Through research, the present invention unexpectedly finds that the polydispersity index P satisfies the following relationship: polylactic acid with 1.55≤P≤2.02 is used as the matrix, superfine talcum powder with a specific range of content is added as a nucleating agent, and a plasticizer with a specific molecular weight is selected As a crystallization accelerator, the light transmittance T of the prepared polylactic acid composite material is ≥ 80%, the haze H is ≤ 40%, and the heat distortion temperature HDT is ≥ 90 ° C, which has significantly improved heat resistance and transparency. |