Polarized SEBS and its preparing mthod

A polarized and polarized technology, applied in the field of polarized SEBS and its preparation, can solve the problems of complex process, high production cost, and low industrial production output, and achieve broad application fields, low production cost and superior performance Effect

Active Publication Date: 2006-03-22
BALING PETRO CHEM CO LTD SINOPEC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with SBS, SEBS has excellent aging resistance, heat resistance and stability, and can be widely used in the production of high-grade elastomers, plastic modification, fillers and sheath materials for wires and cables, etc. Polar materials, limited applications in some fields, especially as plastic modifiers, poor compatibility with polar polymers
In order to improve this shortcoming and increase the polarity of SEBS, the patent EP0743330 uses a dilithium initiator. After the SBS polymerization is completed, the temperature is lowered, and after the capping agent is added, an anionic polymerizable polar monomer (methyl) is added. Acrylic esters are polymerized at -78°C to obtain polar SBS with polar segments at both ends, and then selectively hydrogenate this polar SBS to obtain SEBS with polar segments. Polar modification is directly carried out in the production process of SEBS, but its polar modification conditions are harsh, the polymer concentration is low, the industrial production output is low, and the production cost is h

Method used

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  • Polarized SEBS and its preparing mthod
  • Polarized SEBS and its preparing mthod

Examples

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Embodiment 1

[0013] Example 1: In a 5L polymerization kettle, add 3L cyclohexane, 100ml styrene and a small amount of tetrahydrofuran, add the calculated catalyst butyllithium after raising the temperature to 60°C, and initiate polymerization. After one stage of polymerization is completed, add 435ml butanedi Alkenes and 100ml styrene are polymerized in the second and third stages. After the second and third polymerizations, the active SBS is obtained. The temperature of the system is maintained at 50-90°C. Continue to add 10ml of 2-vinylpyridine to carry out the fourth stage of polymerization. The polymerization time The control is 5 minutes. After the polymerization, transfer the glue solution into a 10-liter hydrogenation stirred tank, raise the temperature, pass hydrogen gas, and add 0.15 mmol of methyl benzoate as a co-catalyst after the temperature of the tank reaches 50 ° C, continue stirring for 20 min, and heat up to 70 ° C at the same time. Add the 0.65mmol dicyclopentadiene tita...

Embodiment 2

[0014] Embodiment 2: Change the 10ml 2-vinylpyridine added in the fourth section into 20ml methyl methacrylate, and other raw materials and manufacturing methods are the same as in Example 1, so that the polar SEBS containing methyl methacrylate can be obtained. The number average molecular weight of the product is 98480, the molecular weight distribution index is 1.13, and the degree of hydrogenation of the conjugated diene is 98.3.

[0015] Preface

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Abstract

The present invention provides a kind of polarized SEBS and its preparation process. The product may be expressed as SEBS-P, where S expresses polystyrene block, EB hydrogenated polybutadiene block, and P polarized block formed via polymerizing polar vinyl pyridine or methacrylate monomer. The preparation process adopts butyl lithium as initiator, tetrahydrofuran as activator and cyclohexane as solvent and includes the steps of the first preparing four block SBS-P polymer, and the subsequent selective hydrogenation to obtain polar SEBS. The present invention produces and polarizes SEBS simultaneously, and thus has high polar monomer converting rate, no need of single treatment of un-converted monomer, simple operation and low production cost. The prepared polar SEBS has obvious polarity, excellent performance, and expanded application field.

Description

technical field [0001] The invention relates to a polarized SEBS and a preparation method thereof. Background technique [0002] Hydrogenated styrene-butadiene-styrene triblock copolymer (SEBS) is a new type of thermoplastic elastomer. A new type of modified elastomer prepared by selective hydrogenation of unsaturated double bonds of butadiene. After hydrogenation, the polybutadiene block in the middle of the hydrogenated SBS is converted into a random copolymerization segment of ethylene and butene-1 and becomes SEBS. Compared with SBS, SEBS has excellent aging resistance, heat resistance and stability, and can be widely used in the production of high-grade elastomers, plastic modification, fillers and sheath materials for wires and cables, etc. Polar materials are limited in application in some fields, especially as plastic modifiers, and have poor compatibility with polar polymers. In order to improve this shortcoming and increase the polarity of SEBS, the patent EP074...

Claims

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Application Information

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IPC IPC(8): C08F297/04C08F8/04
Inventor 肖哲夏金魁熊远凡许安军卢金娥
Owner BALING PETRO CHEM CO LTD SINOPEC
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