Rapid-crystallization polylactic acid plastic and preparation method thereof

The invention discloses a rapid-crystallization polylactic acid composite material and a preparation method thereof. The rapid-crystallization polylactic acid composite material comprises, by mass, 86-99.79% of polylactic acid, 0.1-10% of a high-molecular ion polymer, 0.01-2% of an anti-oxidant and 0.1-2% of a lubricant. The preparation method comprises the following steps of blending the above raw materials, carrying out injection, carrying molding, and carrying out blow molding to obtain the rapid-crystallization polylactic acid plastic. The blending process is a melt blending extrusion granulation method and a blending temperature is in a range of 140-240 DEG C. Compared with the prior art, the preparation method has the advantages that 1, a chemically reactive nucleating agent produces nucleating effects at the molecular level, a crystallization speed is fast, an injection molding period is shortened and processing efficiency is improved, and 2, an organic polymer nucleating agent has good compatibility with polylactic acid and is not separated easily so that adverse influence on product appearance is reduced.