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Polyisoprene preparation method

A technology for polyisoprene and polymerization, which is applied in chemical instruments and methods, mixers with rotary stirring devices, dissolution, etc. The product "hangs on the wall" and other problems, to achieve the effect of improving the conversion rate, increasing the concentration of the feed monomer, and reducing the amount of solvent

Active Publication Date: 2015-11-25
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a method for preparing polyisoprene in order to overcome the low concentration of feed monomer and low conversion rate of isoprene and the phenomenon of "hanging wall" of polymerization products in the prior art

Method used

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Examples

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preparation example

[0050] This preparation example is used to illustrate the preparation of rare earth catalysts.

[0051] Prepare according to Example 1 of CN102108105A.

[0052] Starting from neodymium trioxide, using cyclohexane as a solvent, a neodymium naphthenate / cyclohexane solution is prepared by direct extraction method, wherein the concentration of Nd element is 0.21mol / l. Triisobutylaluminum and diethylaluminum chloride were respectively prepared into cyclohexane solutions with a concentration of 2 mol / l for future use. The water content in the solvent is lower than 20ppm, and the oxygen is exhausted with nitrogen before use, and the aging tank is dried and oxygen exhausted.

[0053] Under nitrogen protection, add 655ml hexanaphthene solution in 2L catalyst aging kettle, then add the neodymium naphthenate / hexanaphthene solution of 65ml isoprene (0.65mol) and 62ml in the aging kettle, again in Add 20ml of cyclohexane solution of diethylaluminum chloride into the aging kettle under st...

Embodiment 1

[0060] This example is used to illustrate the method for preparing polyisoprene of the present invention.

[0061] Under normal temperature and pressure, isoprene monomer (60.1kg / h, polymer grade, commercially available), cyclohexane (168.8kg / h, commercially available) and rare earth catalyst A (11.6kg / h, rare earth catalyst The molar ratio of the amount of A to the isoprene monomer is 1.2×10 -4 ), carry out premixing in the premixer, the time of premixing is 10min. Among them, the concentration of isoprene monomer was 25% by weight.

[0062] The reaction material formed after premixing is continuously fed into a horizontal twin-shaft self-cleaning mixer, the shell volume of which is 100L, and the amount of the reaction material is 60% by volume of the shell volume of the horizontal twin-shaft self-cleaning mixer, The average residence time of the reaction materials in the horizontal twin-shaft self-cleaning mixer is 10 minutes. The reaction temperature was controlled at a ...

Embodiment 2

[0065] This example is used to illustrate the method for preparing polyisoprene of the present invention.

[0066] Under normal temperature and pressure, isoprene monomer (72.1kg / h, polymer grade, commercially available), cyclohexane (154.5kg / h, commercially available) and rare earth catalyst A (13.9kg / h, rare earth catalyst The molar ratio of the amount of A to the isoprene monomer is 1.2×10 -4 ), premixed in the premixer, the premixing time is 10min. Among them, the concentration of isoprene monomer was 30% by weight.

[0067]The reaction material formed after premixing is continuously fed into a horizontal twin-shaft self-cleaning mixer, the shell volume of which is 100L, and the amount of the reaction material is 60% by volume of the shell volume of the horizontal twin-shaft self-cleaning mixer, The average residence time of the reaction materials in the horizontal twin-shaft self-cleaning mixer is 10 minutes. The reaction temperature was controlled at a constant temper...

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Abstract

The present invention discloses a polyisoprene preparation method. According to the method, the method is performed in a single horizontal double-shaft self-cleaning mixer, the horizontal double-shaft self-cleaning mixer comprises a housing with a jacket and at least two stirring shaft in the housing and with stirring paddle blades, and the stirring shafts and the stirring paddle blades are hollow structures. The method comprises: introducing a cooling medium into the jacket and the hollow structures, conveying a reaction material containing a rare earth catalyst, a solvent and an isoprene monomer into the housing, and carrying out a solution polymerization reaction to obtain the polyisoprene. With the method of the present invention, the concentration of the isoprene monomer performing the polymerization is improved, the conversion rate of the isoprene monomer is improved, and the quality of the obtained polyisoprene product is good.

Description

technical field [0001] The present invention relates to a process for the preparation of polyisoprene. Background technique [0002] Rare earth isoprene rubber is a polymer mainly composed of cis 1,4-structural units produced by solution polymerization of isoprene monomer under the action of a rare earth catalyst. The physical properties and mechanical properties of this polymer are similar to natural rubber (NR), so rare earth isoprene rubber is also called "synthetic natural rubber". Specifically, rare earth isoprene rubber has excellent elasticity, sealing, creep resistance, abrasion resistance, heat resistance and tear resistance, and its tensile strength and elongation are also close to natural rubber, so in some cases It can be used as a substitute for natural rubber or in combination with natural rubber (NR) or other synthetic rubbers. Therefore, rare earth isoprene rubber is widely used in rubber processing fields such as tires, belts, and rubber hoses. [0003] A...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F136/08C08F2/06C08F2/01C08F4/54C08F4/52B01J19/18B01F7/04
Inventor 张国娟张杰李传清梁爱民徐林于国柱谭金枚李巍刘美瑜
Owner CHINA PETROLEUM & CHEM CORP
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