Styrene block copolymer reaction extruding polymerizing method

A block copolymer and styrenic technology, applied in the field of preparation of styrenic block copolymers, can solve the problems of restricting the application of styrenic block copolymers, increasing equipment investment and energy consumption, heavy pollution and the like

Inactive Publication Date: 2005-03-02
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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 amou

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] 3 feed inlets are set on the twin-screw extruder, followed by styrene monomer feed inlet, n-butyllithium initiator feed inlet, and isoprene monomer feed inlet; under the delivery of metering pump, The refined monomer and initiator were input into a twin-screw extruder for staged feeding reaction extrusion polymerization to obtain a diblock styrene-isoprene copolymer product A with a number average molecular weight of 230,000. The process conditions are set as follows:

[0074] The temperature of each section of the screw: 40 / 60 / 150 / 200°C

[0075] Monomer mass flow rate (kg / hour): styrene / isoprene=1.0 / 4.0

[0076] Initiator mass flow rate 1.5g / hour

[0077] Screw speed: 50rpm

[0078] product

Embodiment 2

[0080] There are 4 feed ports on the twin-screw extruder, which are styrene monomer feed port, n-butyllithium initiator feed port, isoprene monomer feed port, styrene monomer feed port ; Under the delivery of the metering pump, the refined monomer and initiator are input into the twin-screw extruder for staged feeding reaction extrusion polymerization to obtain a triblock styrene-isoprene with a number average molecular weight of 330,000 Ethylene-styrene copolymer product B. The process conditions are set as follows:

[0081] The temperature of each section of the screw: 20 / 45 / 140 / 180 / 200°C

[0082] Monomer mass flow rate (kg / hour): styrene / isoprene / styrene=0.75 / 3.5 / 0.75

[0083] Initiator mass flow rate 1.1g / hour

[0084] Screw speed: 50rpm

[0085] Product B performance test results

[0086] product

Embodiment 3

[0088] product

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PUM

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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...

Claims

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Application Information

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IPC IPC(8): C08F212/08
Inventor 郑安呐周颖坚危大福孙刚管涌卢红胡福增王书忠
Owner EAST CHINA UNIV OF SCI & TECH
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