Patent ID: 11866537
Assignee: SHANDONG DONGLIN NEW MATERIALS CO., LTD
Field: Macromolecular chemistry, polymers (Chemistry)
Classification: CPC C | IPC C

Claim 19:
20. A method for preparing the easy-to-process, opaque and high-impact MBS for PVC according to claim 1, comprising the following steps:
(1) adding water, an emulsifier, an inorganic salt, a molecular weight regulator, a copolymer of a St monomer and an acrylate monomer, a crosslinking agent and an initiator to a reactor according to a formulated amount; closing a lid of the reactor, and heating to a reaction temperature to carry out a reaction until the reaction is completed; or adding an emulsion that has been reacted at the formulated amount into a separate MBS reactor to carry out the reaction to form a core seed;
(2) adding water, an emulsifier, an inorganic salt solution, a molecular weight regulator, a crosslinking agent and an initiator to a high pressure reactor; closing a lid of the reactor and tightening a bolt; injecting BD or a BD-St copolymer into the reactor;
(3) heating to 70° C. until the reaction is completed;
(4) adding a mixture of emulsifier, outer St monomer, butyl acrylate and MMA to the reactor; continuing the reaction for 1-3 hours until the reaction is completed; and
(5) discharging a reaction product; coagulating a latex by a coagulation method; then centrifuging by a centrifuge, drying by a bubbling fluidized bed (BFB), sieving, and packing to obtain a finished product.