Reaction and extruding polymerizing method for nano size dispersion phase phenylethylene multiple block copolymer

Abstract

The reaction and extrusion polymerizing process of linear styrene / conjugated diolefin block copolymer with nanometer level dispersed phase of special structure and performance includes the following steps: feeding styrene monomer and conjugated diolefin monomer in certain ratio to the first section of screw extruder, feeding polymerization initiator to the second section, and adding antioxidant and other modifiers to the screw extruder from one side and extruding out. The styrene block copolymer has outstanding percentage elongation at rupture and excellent mechanical performance. The present invention combines polymerization reaction and extrusion 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 and less pollution.

Description

technical field [0001] The invention relates to a method for preparing a nanoscale dispersed phase styrenic multi-block copolymer, in particular to a method for continuously producing a nanoscale dispersed phase styrenic block copolymer using a screw extruder as a reactor Reactive extrusion polymerization method. Background technique [0002] Styrenic block copolymer is an important polymer, which is widely used in home appliances, construction, auto parts, asphalt modification, adhesives, packaging and 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, the method that polystyrene block copolymer adopts in...

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Problems solved by technology

[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, the method that polystyrene block copolymer adopts in industry at home and abroad at present is reactor solution polymerization, such as disclosed in U.S. Patent US3078254 The production process route for the synthesis of SBS by two-step coupling method, the production process route for the synthesis of SBS by the three-step addition method adopted in U.S. Patent US3198774, and the synthesis of star-shaped styrene / butadiene block by the multifunctional initiator used in U.S. Patent No. 3957913 The process methods of copolymers are all solution polymerization methods. Usually, the amount of solvent used in the solution polymerization process is 5 to 20 times the mass of the polymer, which means that a lot of follow-up work such as solvent separation, purification, and recovery has been increased. , which not only increases equipment investment and energy consumption, but also increases the pressure on environmental protection. This traditional solution polymerization route of large energy consumption, heavy pollution, high cost, and lengthy process makes the production cost of styrenic block copolymers always Remains high, limiting wider application of styrenic block copolymers

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