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Styrene block copolymer reacting and extruding polymerization

A block copolymer and styrene-based technology, which is applied in the field of preparation of styrene-based block copolymers, can solve problems such as increased environmental protection pressure, high cost, and increased solvent separation

Inactive Publication Date: 2005-07-27
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, at present, the methods used for industrially polymerizing styrenic block copolymers at home and abroad are reaction kettle solution polymerization except that MBS is emulsion polymerization. ,, the production process route of the three-step feed method synthesis SBS adopted in U.S. Patent US3198774, the process method of synthesizing star-shaped styrene / butadiene block copolymer with multifunctionality initiator used in U.S. Patent US3957913, etc., all adopted are The solution polymerization method, usually in the solution polymerization process, the amount of solvent used is 5 to 20 times the polymer mass, which means that a large amount of follow-up work such as solvent separation, purification, recovery, etc. has been increased, which not only increases equipment investment and energy consumption. Consumption, but also increased the pressure on environmental protection
This traditional solution polymerization route with high energy consumption, heavy pollution, high cost and lengthy process has kept the production cost of styrenic block copolymers at a high level, limiting the wider application of styrenic block copolymers

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0074] Refrigerate the styrene monomer and butadiene monomer that have been refined and treated to meet the polymerization requirements of the present invention to -10°C, and are transported to the mixing tank successively according to the weight ratio of styrene / butadiene = 70 / 30 under the delivery of a metering pump. Monomer storage tank, and make the two fully mixed evenly. Three feeding ports are set on the twin-screw extruder, which are the above-mentioned mixed monomer feeding port, tert-butyllithium initiator feeding port, and styrene monomer feeding port in turn; under the delivery of the metering pump, the refined The passed monomer and initiator are input into a twin-screw extruder for staged feeding reaction extrusion polymerization to obtain a block copolymer product A having a structure of styrene / butadiene-styrene with a number average molecular weight of 230,000.

[0075] The process conditions are set as follows:

[0076] The temperature of each section of the...

Embodiment 2

[0082] 4 feeding inlets are set on the twin-screw extruder, followed by chlorostyrene monomer feeding inlet, n-butyllithium initiator feeding inlet, chlorostyrene / butadiene mixed monomer (chlorobenzene Ethylene / butadiene=70 / 30) feed port, chlorostyrene 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 Reactive extrusion polymerization reaction to obtain a block copolymer product B with a number average molecular weight of 330,000 and a structure of chlorostyrene-chlorostyrene / butadiene-chlorostyrene.

[0083] The process conditions are set as follows:

[0084] The temperature of each section of the screw: 40 / 50 / 110 / 190 / 220 / 220°C

[0085] Monomer mass flow rate (kg / hour): chlorostyrene / mixed monomer / chlorostyrene=0.5 / 4.0 / 0.5

[0086] Initiator mass flow rate 1.2g / hour

[0087] Screw speed: 60 rpm.

[0088] product

Embodiment 3

[0090] 4 feed ports are set on the twin-screw extruder, followed by styrene monomer feed port, isopropyllithium initiator feed port, butadiene / isoprene mixed monomer (butadiene / isoprene) Pentadiene=50 / 50) 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 Reaction, the structure of styrene-butadiene / isoprene-styrene multi-block copolymer product C with a number average molecular weight of 320,000 was obtained.

[0091] The process conditions are set as follows:

[0092] The temperature of each section of the screw: 50 / 80 / 180 / 200 / 200 / 200°C

[0093] Monomer mass flow rate (kg / hour): styrene / mixed monomer / styrene=2.0 / 1.5 / 2.5

[0094] Initiator mass flow rate 1.2g / hour

[0095] product

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PUM

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Abstract

A styrene block copolymer reacting extruding polymerizing method is carried out by: delivering styrene monomer, initiating agent, styrene / conjugated diene mixed monomer into screw extruder for polymerization, or delivering styrene monomer, mono-functional organic alkali metal or alkali earth metal initiating agent, styrene / conjugated diene mixed monomer, and coupler into screw extruder for polymerization, and obtaining styrene block copolymer. Its advantages include low cost and consumption, short production period, high output efficiency and no environmental pollution.

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] 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) etc. [0004] However, at present, the methods used for industrially polymerizing styrenic block copolymers at home and abroad are reaction kettle solution polymerization except...

Claims

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Application Information

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IPC IPC(8): B29C47/40C08F4/52C08F297/04
Inventor 郑安呐张锴孙刚周颖坚危大福胡福增卢红王书忠
Owner EAST CHINA UNIV OF SCI & TECH
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