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Method for die swelling of low-die-swelling-rate linear hydrogenated styrene thermoplastic elastomer

A technology of thermoplastic elastomer and hydrogenated styrene, which is applied in the field of preparation of online hydrogenated styrene-based thermoplastic elastomer, can solve the problem of low dosage, difficult industrial production, improvement of melt stability and no control of die expansion and other problems, to achieve the effect of industrialized production, easy industrialized production, and simple operation

Active Publication Date: 2017-04-05
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the prior art, a Chinese patent (publication number CN102875889) discloses a method for improving the stability of polypropylene melt, which is by simultaneously adding tetrafluoroethylene polymer with the function of enhancing the melt strength of polypropylene and having the function of controlling melt The physical blending of sheet-like components with bulk die-expansion function achieves the purpose of reducing the melt die-expansion phenomenon, but does not mention the improvement of melt stability during the synthesis process; Chinese patent (publication number CN85102259) discloses block copolymerization The patent is about the technology of reducing the permanent deformation of block copolymer SDS, that is, adding a small amount of conjugated diene to styrene monomer during a polymerization process, but the method is difficult to realize industrialization due to the small amount Production; Chinese patent (disclosed CN1376721A) discloses a method for reducing the permanent deformation of linear styrenic thermoplastic elastomers, the method mainly relates to linear SBS, SIS, m-SBM-S, hydrogenated styrenic single Body is not involved; although Chinese patent (publication number CN85102259) and Chinese patent (publication CN1376721A) can realize permanent deformation below 44%, but not for the purpose of controlling die expansion

Method used

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  • Method for die swelling of low-die-swelling-rate linear hydrogenated styrene thermoplastic elastomer
  • Method for die swelling of low-die-swelling-rate linear hydrogenated styrene thermoplastic elastomer
  • Method for die swelling of low-die-swelling-rate linear hydrogenated styrene thermoplastic elastomer

Examples

Experimental program
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Effect test

Embodiment 1

[0034] In a 5-liter polymerization kettle (with stirring) that has been cleaned and replaced with high-purity nitrogen, add metered cyclohexane (water value <20ppm), styrene, and regulator, heat the kettle to 45-55°C, and add Initiator n-butyllithium (or sec-butyllithium), react for 30 minutes, add the measured styrene and butadiene into the reactor at the same time, control the maximum temperature not to exceed 100 ° C, react for 30 minutes, finally add styrene, react 30min. After the polymerization reaction is completed, the glue solution is introduced into a 5-liter hydrogenation tank, the temperature is raised to 70°C, a hydrogenation catalyst is added, the hydrogenation pressure is 0.8-1.5Mpa, and the hydrogenation reaction lasts for 120 minutes. After the hydrogenation reaction is completed, the reaction is terminated, the glue solution is purified, the material is discharged, an antioxidant is added, the glue solution is condensed to obtain a white polymer, and the prod...

Embodiment 2

[0038] Test was carried out with isoprene instead of two-stage styrene, the reaction conditions were the same as in Example 1, and the experimental data are listed in Table 2.

[0039] Table 2

[0040]

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Abstract

The invention discloses a preparation method of a low-die-swelling-rate linear hydrogenated styrene thermoplastic elastomer. According to the method, under protection of an inert gas, an alkane is used as a solvent, styrene monomers and conjugated diene monomers are adopted to have an anionic polymerization reaction in the presence of an alkyl lithium initiator and a polar structure adjusting agent, a polymerization product is subjected to catalytic hydrogenation with a titanocene catalyst, and the linear hydrogenated styrene thermoplastic elastomer is obtained; the anionic polymerization reaction comprises steps as follows: (1) the styrene monomers are added for first-stage polymerization; (2) the styrene monomers and butadiene and / or isoprene monomers are added simultaneously, or the butadiene monomers and the isoprene monomers are added simultaneously for second-stage polymerization; and (3) the styrene monomers are added for third-stage polymerization. The die swelling rate of the linear hydrogenated styrene thermoplastic elastomer obtained with the method is 20% or below.

Description

technical field [0001] The present invention relates to a method for the preparation of linear hydrogenated styrenic thermoplastic elastomers with low membrane expansion, in particular to styrene-butadiene / styrene-styrene (hSBSS) with improved selective hydrogenation and controlled distribution , also known as styrene-ethylene butadiene / styrene-styrene (S-EB / S-S) block copolymers and selectively hydrogenated styrene-butadiene / isoprene-styrene ( hSIBS, also known as Styrene-Ethylene Butadiene / Isoprene-Styrene (S-EB / P-S) block copolymers, is a membrane-swelling method. Background technique [0002] Membrane swelling is related to the elastic memory capacity of polymer melts. When the melt enters the die, it is subject to strong tensile and shear deformation, and the tensile deformation is elastic deformation. Only part of these deformations are relaxed in the die, and the remaining part undergoes elastic recovery after being extruded from the die, resulting in extrusion swel...

Claims

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Application Information

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IPC IPC(8): C08F297/04
Inventor 苏滢莫笑君严绍敏
Owner CHINA PETROLEUM & CHEM CORP
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