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Patent number: ZL 200910229836.8

Patent introduction: The present invention discloses a method for preparing high rigidity chlorinated polyethylene, which is produced by hydrochloric acid phase method. The method comprises the following steps: adding high-density polyethylene, dispersant, and anti sticking agent to hydrochloric acid solution under stirring state to prepare a suspension solution; Introduce chlorine gas into the suspension solution in two stages for chlorination reaction, with a reaction temperature of 30-140 ℃, a chlorine gas injection amount of 0.5-1.2 times the weight of high-density polyethylene, and a reaction time of 3-5 hours; After separating, washing, dehydrating, and drying the chlorinated product, a chlorine content of 20-35wt% is obtained, DSC≤5J/g， High rigidity chlorinated polyethylene products with a Shore hardness of 60-80% and a modulus of elongation greater than 2.0 MPa. The high rigidity chlorinated polyethylene produced by the present invention can replace expensive MBS as an impact modifier for hard PVC products, meeting the material's requirements for rigidity and toughness.