PREPARATION METHOD OF RUBBER LATEX FOR METHYL METHACRYLATE-BUTADIENE-STYRENE RESIN

摘要

PURPOSE: A method for preparing a rubber latex for a methyl methacrylate-butadiene-styrene(MBS) resin, a rubber latex and a methyl methacrylate-butadiene-styrene resin prepared from the rubber latex are provided to control the glass transition temperature of the rubber latex by multi-staged polymerization, thereby improving the impact resistance at a low temperature. CONSTITUTION: The method comprises the steps of making a core polymer from 10-70 wt% of a monomer mixture of a conjugated diene-based butadiene and a monoethylene unsaturated aromatic compound by emulsion polymerization; and adding 30-90 wt% of the monomer mixture to the core polymer and making an outer rubber layer onto the core polymer by emulsion polymerization. The monomer mixture comprises 50-95 wt% of a conjugated diene-based butadiene and 5-40 wt% of a monoethylene unsaturated aromatic compound. Preferably the first-stage emulsion polymerization is carried out by employing 0.01-5 parts by weight of a graft cross-linking agent based on 100 parts by weight of the added monomer; and the second-stage emulsion polymerization is carried out by employing 0.01-5 parts by weight of a graft cross-linking agent based on 100 parts by weight of the rest monomer.