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Preparation method of polyisobutene with medium molecular weight in boron trifluoride initiating system

A technology for initiating system and polyisobutene, applied in the field of preparation of medium molecular weight polyisobutene, can solve the problems of difficult control of isobutene and unstable product quality, and achieve the effects of improved molecular weight distribution, high conversion rate and wide adjustment range

Inactive Publication Date: 2011-05-11
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is the most important factor that causes the difficult control of the isobutylene cationic polymerization process and the unstable product quality

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] 500 milliliters of there-necked flasks are equipped with attachments such as stirring and a thermometer, after this there-necked flasks are evacuated and nitrogen replacement is qualified, to wherein adding the mixture of 192 grams (300ml) of isobutylene and hexane, wherein isobutylene concentration is 35wt.%. h 2 0 content is 1.39×10 -3 mol / kg, the methanol content in isobutene is 1.56×10 -3 mol / kg isobutene. Cool the polymerization solution in the three-necked flask to -35°C through a low-temperature bath, start stirring and add 9.07×10 -3 g NH 3 Gas, then add 0.03 g of BF 3 , control the polymerization reaction temperature in the three-necked flask at -35°C to -30°C, after 40 minutes of reaction, terminate and wash with 300ml of water, and introduce the mixture into a separatory funnel to remove the water phase. After the glue solution was filtered, the solvent was distilled off to obtain medium molecular weight polyisobutylene with a viscosity average molecular...

Embodiment 2

[0013] Repeat the method described in Example 1, except that the polymerization temperature in the there-necked flask is controlled at -30°C to -25°C to obtain a medium molecular weight polyisobutylene with a viscosity average molecular weight (Mv) of 84,000mm.

Embodiment 3

[0015] Repeat the method described in Example 1, the difference is to add 0.043 gram of BF 3 , Obtaining a viscosity-average molecular weight (Mv) is 55,000-medium molecular weight polyisobutylene.

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Abstract

The invention relates to a preparation method of polyisobutene with a medium molecular weight in a boron trifluoride initiating system. The preparation method comprises the following steps: adding Lewis acid BF3 and a nucleophilic reagent into a liquid phase polymerization system of isobutene monomer and solvent normal hexane or hexane fraction to form an initiating system with alcohol or ether, and initiating isobutene cationic polymerization to obtain the medium-molecular weight polyisobutene product with a viscometric average molecular weight (MV) of 30000-100000. By adding the nucleophilic reagent, the negative effect of water can be effectively inhibited, so that chain initiation and chain growth during isobutene cationic polymerization can be effectively controlled.

Description

technical field [0001] The present invention relates to a kind of preparation method of medium molecular weight polyisobutene, in particular to a kind of preparation method of boron trifluoride initiation system molecular weight polyisobutene Background technique [0002] Polyisobutylene is a cationic polymer of isobutylene. According to the different molecular weight, it can be divided into low molecular weight polyisobutene, medium molecular weight polyisobutene and high molecular weight polyisobutene. Medium-molecular-weight polyisobutylene is a colorless, odorless, non-toxic, viscous semi-solid substance with good heat resistance, oxidation resistance, ultraviolet resistance, and chemical resistance. It is mainly used in adhesives (hot melt adhesives, Pressure sensitive adhesive), sealant (automotive sealant, hollow glass sealant), damping adhesive, chewing gum base adhesive, medical sticky paste and lubricating oil viscosity index modifier, etc. [0003] The process t...

Claims

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Application Information

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IPC IPC(8): C08F110/10C08F4/14
Inventor 李鹤春南春模李坤刘伟孙宝东边侠玲杨艳文史春岩曲亮奚延斌
Owner PETROCHINA CO LTD
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