Preparing process for vinyl aromatic monomer - conjugated diene star type block copolymer
A technology of vinyl aromatic and block copolymers, which is applied in the field of preparation of star-shaped block copolymers, can solve problems such as high equipment cost, pollution of polymerization kettles, and environmental pollution, so as to save equipment investment and solve product color change yellow effect
Inactive Publication Date: 2004-09-01
BALING PETRO CHEM CO LTD SINOPEC
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AI Technical Summary
Problems solved by technology
[0003] 1. Make the polymerization kettle polluted
[0004] 2. It is required that the polymerization and post-treatment system must be resistant to acid corrosion, and the equipment cost is relatively high
[0005] 3. A large amount of acid-containing sewage is produced in the post-treatment of the glue solution, which pollutes the environment and increases the cost of sewage treatment
[0006] 4. After the acid glue is stored for a long time, the color turns yellow and the glue deteriorates obviously
[0007] 5. Due to the halogen-containing coupling agent, after coupling, the generated lithium halide cannot be activated again, so it is necessary to add alkyllithium as a reducing agent during the hydrogenation reaction of the polymer
Method used
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Experimental program
Comparison scheme
Effect test
Embodiment 1
[0023] Add 3000ml of cyclohexane and 200g of styrene into a 5-liter stainless steel reactor. When the temperature rises to 40°C-60°C, add 20ml (concentration: 0.5mol / l) of n-butyllithium, react for 25min, and add 300g Butadiene, react for 40min, add 3mmol diphenyl terephthalate, react at 80°C for 30min.
Embodiment 2
[0025] With embodiment 1, only coupling agent is dimethyl terephthalate.
Embodiment 3
[0027] With embodiment 1, only coupling agent is dibutyl terephthalate.
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Abstract
The invention provides a method for preparing star type segmented copolymer of vinyl aromatic monomers - conjugated diolefin, characterized in that R1C-R2-COOR3 category compounds are used as the coupling agent, group R 2 is alkyl or phenyl group having 1-8 carbon atoms, R1 and R3 are alkyl or phenyl group having 1-6 carbon atoms, because polyfunctional group coupling agent containing no halogen element is used, no color change will occur to the copolymer during the coagulation process.
Description
technical field [0001] The invention relates to a preparation method of a vinyl aromatic monomer-conjugated diene star block copolymer. Background technique [0002] In the anionic polymerization technology for the preparation of vinyl aromatic monomer-conjugated diene star block copolymers, the coupling method is usually used. The usual coupling method is the reaction of a linear active polymer with a carbanion terminal with a multifunctional electrophilic compound (such as a halogen-containing multifunctional terminator-SiCl4, SnCl4), and the electrophilic atom (such as a halogen) is the active replaced by polymer chains. Since alkyllithium and negatively charged silane substitutes can rapidly produce metathesis reaction, a star-shaped block copolymer can be generated. When using an electrophilic halogen-containing multifunctional coupling agent, the amount of the coupling agent should theoretically be equivalent to the active polymer chain, but in order to overcome the ...
Claims
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IPC IPC(8): C08F297/04
Inventor 蒋遥明夏金魁肖勇国
Owner BALING PETRO CHEM CO LTD SINOPEC
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