Method for preparing rubber master batch from lignin-dispersed calcium sulfate

The invention relates to a method for preparing a rubber master batch from lignin-dispersed calcium sulfate. The method comprises the following steps: 1. lignin-dispersed calcium sulfate preparation: proportionally mixing lignin and calcium sulfate, adding water which accounts for a certain ratio of the lignin-calcium sulfate mixture, uniformly mixing, carrying out wet-process ball milling on a ball mill for 4 hours to obtain a lignin-dispersed calcium sulfate slurry, and dewatering the obtained slurry at a certain temperature to obtain a hydrous lignin-dispersed calcium sulfate filler; and 2. blending the hydrous lignin-dispersed calcium sulfate filler in the step 1 and rubber in an open mill or Banbury mixer, and carrying out extrusion and granulation to prepare the rubber master batch. The application research indicates that the rubber master batch can be used as a reinforcing agent and can greatly enhance the mechanical properties of the rubber material. The method has the advantages of simple technique,