Styrene-conjugated diene star-shaped block copolymer and preparation method thereof

Abstract

The invention provides styrene-conjugated diene star-shaped block copolymer. The structural formula of the star-shaped block copolymer is {C-(SB)n}x-M. The preparation method of the star-shaped block copolymer comprises the following steps: using styrene monomer to perform first-stage polymerization under the action of initiator; then adding conjugated diene monomer to perform second-stage polymerization, controlling the number average molecular weight of the conjugated diene section in the second-stage polymerization to be (2.5-6.0)*10<4>; and using epoxidized vegetable oil as coupling agentto perform coupling reaction. As the coupling agent with halogen is not used, the acidic environment can not be generated in the synthetic process of the product and the equipment investment can be saved; and the hot melt adhesive prepared from the product has better heat resistance and bonding strength than that prepared by the prior art.

Description

technical field [0001] The invention relates to a styrene-conjugated diene star block copolymer and a preparation method thereof. Background technique [0002] The patent application with the application number 95103049.3 discloses a "Method for Preparing Conjugated Diene-Vinylbenzene Star Block Copolymer", which includes vinylbenzene is polymerized with a lithium catalyst, then copolymerized with conjugated diene, and then The coupling agent silicon tetrachloride is used to couple into a star-shaped block copolymer, which is characterized in that the amount of the coupling agent is less than the equivalent value of organolithium 0.250. This patent uses silicon tetrachloride as the coupling agent, so that the polymerization tank is subjected to Pollution requires that the polymerization and post-treatment system must be resistant to acid corrosion, which requires high equipment quality; a large amount of acid-containing sewage is produced in the post-treatment of the glue so...

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Problems solved by technology

[0002] The patent application with the application number 95103049.3 discloses a "Method for Preparing Conjugated Diene-Vinylbenzene Star Block Copolymer", which includes vinylbenzene is polymerized with a lithium catalyst, then copolymerized with conjugated diene, and then The coupling agent silicon tetrachloride is used to couple into a star-shaped block copolymer, which is characterized in that the amount of the coupling agent is less than the equivalent value of organolithium 0.250. This patent uses silicon tetrachloride as the coupling agent, so that the polymerization tank is subjected to Pollution requires that the polymerization and post-treatment system must be resistant to acid corrosion, which requires high equipment quality; 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; residual halogen elements in the product will affect the quality of the product Application field

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