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Homogeneous catalytic hydrogenation method for styrene-isoprene-styrene triblock copolymer

A technology of isoprene and homogeneous catalysis, applied in the field of hydrogenation of thermoplastic elastomers, to achieve good hydrogenation selectivity, improve catalyst efficiency, and simple and easy experimental operation

Inactive Publication Date: 2018-03-23
王金书
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, there have been many reports on the process technology of polymer hydrogenation

Method used

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  • Homogeneous catalytic hydrogenation method for styrene-isoprene-styrene triblock copolymer
  • Homogeneous catalytic hydrogenation method for styrene-isoprene-styrene triblock copolymer
  • Homogeneous catalytic hydrogenation method for styrene-isoprene-styrene triblock copolymer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031]Three kinds of SIS glue solutions with different mass fractions were prepared, and the variation range was 0.5%-3%. The relative content of the catalyst added under each glue solution mass fraction remained unchanged, and the nickel content was used as the standard to set 0.1-1mmol / g SIS , wherein the molar ratio of Al / Ni is 2-8, the hydrogenation pressure is 1MPa-5MPa, the hydrogenation temperature is 40°C-100°C, and the reaction time is 1h-5h. The resulting product is tested by infrared, and the experimental results are as attached figure 1 As shown, the degree of hydrogenation under each glue mass fraction is shown in the table below.

[0032]

Embodiment 2

[0034] Prepare the SIS glue solution of 1.5w%, change the molar ratio scope of Al / Ni substance in 2-8, other reaction conditions are as embodiment 1, experimental infrared test result is as attached figure 2 As shown, the resulting degree of hydrogenation is shown in the table below.

[0035]

Embodiment 3

[0037] Prepare 1.5w% SIS glue, change the hydrogenation temperature in the range of 40°C-100°C, other experimental conditions are as in Example 1, and the experimental infrared test results are as attached image 3 Shown, the degree of hydrogenation obtained at each hydrogenation temperature is shown in the table below.

[0038]

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PUM

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Abstract

The invention relates to the technical field of hydrogenation of thermoplastic elastomers, and particularly discloses a homogeneous catalytic hydrogenation method for a styrene-isoprene-styrene triblock copolymer. The homogeneous catalytic hydrogenation method is characterized by comprising the following steps: adding a catalyst b solution into a catalyst a solution, and performing aging to obtaina hydrogenation catalyst; dissolving a triblock copolymer SIS into cyclohexane, and placing the mixed material into a hydrogenation reaction kettle, under stirring conditions performing vacuumizing and raising the temperature, adding the hydrogenation catalyst into the hydrogenation reaction kettle, filling the reaction kettle with a hydrogen gas, and performing a hydrogenation reaction; and performing cooling to a room temperature after the reaction is completed, taking out a hydrogenation glue liquid, adding hydrochloric acid dropwise into the glue liquid, performing flocculation with anhydrous ethanol, and performing vacuum drying to obtain the product. According to the method provided by the invention, the catalyst does not need to be specifically removed, the experimental operation is simple and easy to implement, the catalyst efficiency is improved, the usage amount of the catalyst is reduced, meanwhile, the thermoplastic elastomer SIS with a high molecular weight can be hydrogenated under a lower temperature, and the method has good hydrogenation selectivity.

Description

(1) Technical field [0001] The invention relates to the technical field of thermoplastic elastomer hydrogenation, in particular to a method for homogeneous catalytic hydrogenation of styrene-isoprene-styrene triblock copolymer. (2) Background technology [0002] Due to the carbon-carbon unsaturated double bonds contained in polymer unsaturated polymers, it is easy to oxidize, and its weather resistance and thermal stability are insufficient, which limits its extensive development. The most representative one is the block copolymer of styrene and butadiene (SBS). SBS is made of SEBS by hydrogenation to saturate the double bonds, which makes up for the defects of SEBS. But unfortunately, SEBS is non-polar, so it has poor adhesion to polar substances, especially it is difficult to soften and thicken the hard and viscous SEBS. According to the research, SIS has many excellent properties compared with SBS. Firstly, SIS has better compatibility with other materials than SBS; sec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F8/04C08F297/04C08F4/70
CPCC08F8/04C08F4/7098C08F297/046
Inventor 郭春平庞飞徐龙坤袁本福王辉王中亚王荣光侯红霞王建伟王胜伟
Owner 王金书
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