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Conjugated diene polymers and preparation method thereof, and polybutadiene and polyisoprene

A conjugated diene and polybutadiene technology, which is applied to conjugated diene polymers and their preparation, as well as the fields of polybutadiene and polyisoprene, can solve the problem of narrow molecular weight distribution of conjugated diene polymers, etc. problem, to achieve the effect of controllable basic molecular weight and wide molecular weight distribution

Active Publication Date: 2017-11-10
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to overcome the defect of narrow molecular weight distribution of conjugated diene polymer prepared by adopting the existing batch polymerization process, to provide a kind of conjugated diene polymer and its preparation method and polybutadiene and polyisocyanate pentadiene

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  • Conjugated diene polymers and preparation method thereof, and polybutadiene and polyisoprene

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preparation example Construction

[0019] The present invention provides a method for preparing a conjugated diene polymer. The method is to perform batchwise polymerization of conjugated diene in a single reactor. The polymerization of conjugated diene includes primary polymerization and secondary polymerization. The polymerization reaction includes the following steps: (1) Under anionic polymerization conditions, the reaction material containing the first part of the conjugated diene monomer, the polarity regulator, the solvent and the monoorganolithium initiator is added to the reactor to perform a polymerization reaction. The maximum temperature of the polymerization reaction is 80-110°C; (2) When the maximum temperature of the primary polymerization reaction is reached, the second part of the conjugated diene monomer is added to the reactor for secondary polymerization reaction, and the maximum temperature of the secondary polymerization reaction is It is 110~160℃.

[0020] The inventor of the present inventi...

Embodiment 1

[0052] This example illustrates the preparation method of the polybutadiene of the present invention.

[0053] (1) Under the protection of high-purity nitrogen, add a cyclohexane / n-hexane mixed solvent (the weight ratio of cyclohexane to n-hexane is 82:18, the same below) 4000g, 1. 889 g of 3-butadiene, 21.37 mmol of tetrahydrofurfuryl ethyl ether. Add 26.66mmol of n-butyl lithium to initiate a polymerization reaction, control the initial initiation temperature of the polymerization reaction to 50°C, and the pressure of the polymerization reaction to 0.2MPa;

[0054] (2) When the primary polymerization reaction reaches the maximum temperature of the primary polymerization reaction, 444 g of 1,3-butadiene is added for the second time for the secondary polymerization reaction, and the pressure of the secondary polymerization reaction is 0.2 MPa;

[0055] (3) After the secondary polymerization reaction was heated to the highest temperature of the secondary polymerization reaction, the ...

Embodiment 2

[0065] This example illustrates the preparation method of the polybutadiene of the present invention.

[0066] (1) Under the protection of high-purity nitrogen, sequentially add 4000 g of cyclohexane, 750 g of 1,3-butadiene, and 15.27 mmol of tetrahydrofurfuryl ethyl ether into a 10-liter polymerizer. Adding 8.33 mmol of n-butyl lithium to initiate a polymerization reaction, control the initial initiation temperature of the polymerization reaction to 55° C., and the pressure of the polymerization reaction to be 0.25 MPa.

[0067] (2) When the primary polymerization reaction reaches the highest temperature of the primary polymerization reaction, 250g of 1,3-butadiene is added for the second time for the secondary polymerization reaction, and the pressure of the secondary polymerization reaction is 0.25 MPa;

[0068] (3) After the secondary polymerization reaction was heated to the highest temperature of the secondary polymerization reaction, the reaction was continued for 10 minutes, ...

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Abstract

The invention relates to the field of preparation of conjugated diene polymers, and provides conjugated diene polymers and a preparation method thereof, and polybutadiene and polyisoprene. According to the method, a conjugated diene polymerization reaction is performed intermittently in a single reaction kettle; and the conjugated diene polymerization reaction comprises a primary polymerization reaction and a secondary polymerization reaction. The method comprises the following steps: (1) under anionic polymerization conditions, adding a reaction material, which contains a first part of conjugated diene monomer, a polarity regulator, a solvent and a single organic lithium initiator, into a reaction kettle, and performing the primary polymerization reaction, wherein the maximum temperature of the primary polymerization reaction is 80-110 DEG C; and (2) when the maximum temperature of the primary polymerization reaction is achieved, adding a second part of conjugated diene monomer into the reaction kettle, and performing the secondary polymerization reaction, wherein the maximum temperature of the secondary polymerization reaction is 110-160 DEG C. The method provided by the invention can obtain the conjugated diene polymers with wider molecular weight distribution.

Description

Technical field [0001] The present invention relates to the field of preparation of conjugated diene polymers, in particular to a method for preparing conjugated diene polymers by batch polymerization, and the conjugated diene polymers prepared by the method, and specifically, applications The method carries out the polybutadiene obtained by polymerizing 1,3-butadiene, and the polyisoprene obtained by applying the method to polymerize 1,3-isoprene. Background technique [0002] Generally speaking, when the polymer high molecular weight fraction content is high, the strength of the rubber is high, but the processing performance is poor; when the low molecular weight fraction content is high, although it is easy to process, the strength of the rubber becomes low, which will affect its performance . In addition, in the vulcanization process, the very low molecular weight part is generally difficult to vulcanize, which makes the rubber compound incompletely vulcanized, increases the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F136/08C08F136/06C08F2/06C08F2/38
CPCC08F136/06C08F136/08C08F2/06C08F2/38
Inventor 吕万树徐林王雪胡保利邰峰董新民赵晓冬
Owner CHINA PETROLEUM & CHEM CORP
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