Method of selective hydrogenation containing conjugated diene block copolymer

A technology of block copolymer and conjugated diene, which is applied in the field of selective hydrogenation of block copolymer containing conjugated diene, can solve the problems of high toxicity, increased energy consumption, inaccurate feeding, etc. The effect of reducing energy consumption and reducing costs

Inactive Publication Date: 2003-04-16
BALING PETRO CHEM CO LTD SINOPEC +1
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  • Abstract
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Problems solved by technology

[0003] Because the hydrogenation main catalyst dicyclopentadiene titanium dichloride is solid powder, in the prior art, U.S. Patent No. 5,291,990 adopts cyclohexane as the solvent of the main catalyst dicyclopentadiene titanium dichloride to dissolve the main catalyst In cyclohexane, then add the reaction system, because the solubility of the main catalyst dicyclopentadiene titanium dichloride in cyclohexane is very low (at 25°C, 1000ml cyclohexane can only dissolve 0.001g dicyclopentadiene dichloride Titanium chloride), according to the main catalyst required for the reaction, a large amount of cyclohexane will be added to the reaction system, generally the cyclohexane of the system will be increased by 30%, so that the energy consumption of post-treatment will be increased
[0004] Chinese patent ZL.97108258.8 adopts toluene as the solvent of the main catalyst dicyclopentadiene titanium dic

Method used

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Examples

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Example Embodiment

[0017] Example 1

[0018] Add 3500ml of cyclohexane, 24ml of tetrahydrofuran, 85ml of styrene, and 8mmol of n-butyllithium into a 10L kettle for one-stage polymerization. After 15 minutes, add 580ml of butadiene for two-stage polymerization. After 30 minutes, add 85ml of styrene for three-stage polymerization. The temperature is between 30°C and 110°C. The obtained glue solution is introduced into a 10L hydrogenation kettle, and the tetrahydrofuran solution of dicyclopentadiene titanium dichloride as the main catalyst is added. The amount added is calculated as 0.13mmol / 100gSBS. Dimethyl formate is added in an amount of 0.7mmol / 100gSBS, and hydrogenation reaction is carried out at a reaction temperature of 60°C-110°C and a pressure of 0.5Mpa-2.0Mpa, and the reaction time is 2 hours. The results are shown in Table 1:

[0019] Table 1 Hydrogenation results of different catalyst concentrations

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Abstract

A process for selectively hydrogenating the block copolymer containing conjugated diolefine features that the tetrahydrofuran is used as the solvent of bicyclopentadiene titanium bichloride as primary catalyst. Its advantages are low energy consumption for post-treatment as tetrahydrofuran has high solubility, low poison of tetrahydrofuran, low cost, and high hydrogenation effect.

Description

technical field [0001] The invention relates to a method for selectively hydrogenating block copolymers containing conjugated dienes. Background technique [0002] Conjugated diene-containing block copolymers mainly refer to copolymers obtained by anionic polymerization using styrene, butadiene (or isoprene) as monomers and alkyllithium as an initiator, mainly including Thermoplastic rubber SBS, SIS, etc., there are still double bonds in the soft segment of polybutadiene or polyisoprene in this type of copolymer, so the anti-aging performance is poor, and its application field is limited. In order to improve the anti-aging performance of this type of copolymer, the block copolymer containing conjugated diene is usually selectively hydrogenated, that is, under the condition of dicyclopentadiene titanium dichloride as a catalyst, the copolymer is polyconjugated The unsaturated double bond in the diene block undergoes hydrogenation reaction to make it saturated, while the benz...

Claims

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Application Information

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IPC IPC(8): C08F8/04C08F297/02
Inventor 梁红文李望明张红星彭小寒张君花
Owner BALING PETRO CHEM CO LTD SINOPEC
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