Special black master batch for polylactic acid based degradable plastics and preparation method thereof

The invention discloses a special black master batch for polylactic acid based degradable plastics and a preparation method thereof. The special black master batch for polylactic acid based degradable plastics comprises the following components in percentage by weight: 20-40% of pigment carbon black, 15-30% of dispersing lubricant and 40-65% of carrier resin, wherein the carrier resin adopts polylactic acid. In the special black master batch for polylactic acid based degradable plastics, the polylactic acid carrier resin is taken as a basic component, and interacted with the pigment carbon black, the dispersing lubricant and the like in the extrusion process, thus special black master batch for polylactic acid based degradable plastics has the advantages of good compatibility and easy dispersing. In the process of preparing the plastics by using the special black master batch for polylactic acid based degradable plastics, the black master batch is used a little, the prepared plastic is good in mechanical behaviors, easy in degradation, and economic and environmentally friendly. In the preparation method, the process is simple, and the cost is low; and the preparation method is suitable for industrialized production.