Styrene block copolymer reaction extruding polymerizing method

Abstract

The reaction and extrusion polymerizing process of styrene block copolymer includes the following steps: feeding styrene monomer, initiator and other monomer to be copolymerized to different sections of screw extruder successively to perform copolymerization; or, feeding styrene monomer, single functional group organic alkali or alkali earth metal initiator, other monomer to be copolymerized and coupler to different sections of screw extruder successively to perform copolymerization, so as to obtain the styrene block copolymer. The present invention adopts reaction and extrusion polymerizing technology to shorten the production period to several minutes, and the whole process has no solvent added and thus no need of complicated solvent separation and purification. Therefore, the present invention has high production efficiency, low power consumption, low cost, less pollution and other advantages.

Description

technical field [0001] The invention relates to a preparation method of a styrenic block copolymer, in particular to a reaction extrusion polymerization method for continuously producing a styrenic block copolymer with a screw extruder as a reactor. Background technique [0002] The said styrenic block copolymer is an important polymer, which is widely used in home appliances, construction, auto parts, asphalt modification, adhesives, packaging and many other fields. [0003] At present, the styrenic block copolymers that are widely used are styrene-butadiene-styrene block copolymer (SBS), styrene-isoprene-styrene block copolymer (SIS), styrene -Butadiene random copolymer (SB), styrene / conjugated diene multi-block copolymer (number of blocks is 5-9), K resin, methyl methacrylate-butadiene-styrene copolymer (MBS), acrylonitrile-butadiene-styrene copolymer (ABS), etc. But at present, the method adopted in industrially polymerizing styrenic block copolymers both at home and a...

AI Technical Summary

Problems solved by technology

But at present, the method adopted in industrially polymerizing styrenic block copolymers both at home and abroad is reactor solution polymerization, such as the production process route of using two-step coupling method to synthesize SBS disclosed in U.S. Patent No. 3,078,254, and the three-step coupling method adopted in U.S. Patent No. 3,198,774 The production process route for the synthesis of SBS by the addition method, the process method for synthesizing star-shaped styrene / butadiene block copolymers with multifunctionality initiators used in U.S. Patent No. The amount of medium solvent used is 5 to 20 times the mass of the polymer, which means that a large amount of follow-up work such as solvent separation, purification, and recovery has been added, which not only increases equipment investment and energy consumption, but also increases the pressure on environmental protection. This traditional Due to the high energy consumption, heavy pollution, high cost and lengthy process of solution polymerization route, the production cost of styrenic block copolymers has been high, which limits the wider application of styrenic block copolymers