A kind of isoprene rubber and its continuous production method

A production method and isoprene rubber technology, applied in the isoprene rubber field, can solve the problems of poor catalyst stability, no comparability, and influence on the performance of isoprene rubber.

Active Publication Date: 2016-04-27
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] CN101880344A discloses an adiabatic method for solution polymerization of rare earth isoprene rubber, which uses a three-component catalyst system containing rare earth elements, alkyl aluminum and halides, isoprene (monomer concentration below 15%), Catalyst system and solvent enter multiple polymerization tanks in series at 0-35°C for continuous adiabatic polymerization, and the conversion rate of isoprene monomer is relatively low, generally below 90%.
In addition, in this method, the temperature of the last tank is too high when carrying out continuous polymerization in 7 tanks, which may increase the gel content, thereby affecting the performance of isoprene rubber.
In addition, when the rare earth compound uses acidic neodymium phosphonate, since the rare earth phosphonate is insoluble in hydrocarbon solvents, the rare earth phosphonate is suspended in aliphatic or alicyclic hydrocarbons when preparing this type of catalyst, and the prepared catalyst is non-toxic. Homogeneous state, poor catalyst stability, this situation is not comparable to the situation using neodymium carboxylate

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  • A kind of isoprene rubber and its continuous production method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The preparation of the rare earth catalyst uses hexane as a solvent. In the rare earth catalyst, the molar ratio of neodymium naphthenate, triisobutylaluminum, ethyl aluminum sesquichloride and isoprene is 1:10:2:40.3 Two reaction kettles with a volume of 120L are connected in series, and the rare earth catalyst, isoprene and hexane (reaction material) with a temperature of -20℃ are continuously added to the first kettle at -20°C, and the moles of neodymium in isoprene and rare earth catalyst The ratio is 1:1.6×10 -4 , the concentration of isoprene monomer in the first kettle was 16% by weight, and the residence time of the reaction materials was 47 minutes. Add-20 DEG C hexane in the second kettle and the third kettle, so that the concentration of the isoprene monomer in the second kettle is 14% by weight, and the residence time of the reaction mass is 41 minutes. The concentration was 13% by weight and the residence time of the reaction mass was 38 minutes. After 20...

Embodiment 2

[0045] Polymerization of isoprene was carried out according to the method of Example 1, except that the temperature of adding hexane in the second kettle and the third kettle was 10°C. After 20 hours of polymerization, the temperature of each reactor tended to be stable, the first reactor was 36°C, the second reactor was 45°C, and the third reactor was 51°C.

[0046] The methanol solution of 2,6-di-tert-butylhydroquinone is added to the glue liquid flowing out from the three kettles, and then the isoprene rubber is obtained after coagulation, dehydration, drying and packaging. After the temperature of each reaction kettle tended to be stable, the glue and the obtained isoprene rubber were tested. As a result, the Mooney viscosity of the isoprene rubber was 69, and the cis 1,4-structure content was 98% by weight; the isoprene The monomer conversion rate is 99%.

Embodiment 3

[0048] Polymerize isoprene according to the method of Example 1, the difference is that the amount of solvent added in the second kettle and the third kettle makes the concentration of isoprene monomer in the second kettle 14% by weight, and the residence time of the reaction materials The time was 44 minutes, the concentration of isoprene monomer in the three-pot was 12% by weight, and the residence time of the reaction materials was 38 minutes. After 20 hours of polymerization, the temperature of each reactor tended to be stable, the first reactor was 36°C, the second reactor was 39°C, and the third reactor was 42°C.

[0049] The methanol solution of 2,6-di-tert-butylhydroquinone is added to the glue liquid flowing out from the three kettles, and then the isoprene rubber is obtained after coagulation, dehydration, drying and packaging. After the temperature of each reaction kettle tended to be stable, the glue and the obtained isoprene rubber were tested. As a result, the Mo...

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Abstract

The invention provides a continuous production method of isoprene rubber and the isoprene rubber produced thereby. The method is carried out in a plurality of adiabatic reactors which are connected in series. The method comprises the following steps of: continuously feeding a reactant containing isoprene, a rare earth catalyst and a solvent from a first adiabatic reactor of the plurality of series-connected adiabatic reactors; refilling the solvent to at least one of the adiabatic reactor following the first adiabatic reactor in order to polymerize isoprene to obtain a rubber solution; and treating the rubber solution by coagulating, dewatering and drying in sequence, wherein an isoprene monomer in the material fed in the first adiabatic reactor is at the concentration of 14 to 50 wt%; and the rare earth catalyst contains neodymium carboxylate with 7 to 14 carbon atoms, aluminum alkyl, halide and conjugated diene. According to the method, the output can be increased, the monomer conversion rate of isoprene reaches more than 96%, and the prepared isoprene rubber contains at least 98wt% of cis-1,4-structure based on the content.

Description

technical field [0001] The invention relates to a continuous production method of isoprene rubber and the isoprene rubber produced by the method. Background technique [0002] The domestic production capacity of natural rubber is limited, the import volume of natural rubber is increasing year by year, and the price is also rising all the way. Isoprene rubber with excellent performance has been proved to be able to partially replace natural rubber in practical applications. Therefore, the development and production of isoprene rubber has become the main way to solve the shortage of natural rubber in my country. The isoprene rubber with high cis-1,4-structure content (the structure content is greater than 96% by weight) obtained by polymerization with a neodymium rare earth catalyst has excellent properties, which are close to natural rubber (NR), and are also superior in some properties. in natural rubber. [0003] CN101045768A discloses a homogeneous catalyst composed of n...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F136/08C08F236/08C08F4/52C08F4/54
Inventor 李传清于国柱张杰杨亮亮欧阳素芳赵姜维申翠平辛益双徐林梁爱民
Owner CHINA PETROLEUM & CHEM CORP
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