Method for producing rare-earth isoprene butadiene rubber

A technology of butylene rubber and production method, which is applied to tire parts, transportation and packaging, special tires, etc., can solve the problems of recycling monomers and low purity of solvents, achieve easy mixing and processing, reduce production energy consumption, and reduce Effect on overall production cost

Active Publication Date: 2011-11-09
FUSHUN YIKESI NEW MATERIAL
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0016] The purpose of the present invention is to adopt the multi-tower cycle preparation process to solve the problems of recovery of monomers and low purity of solvents caused by cross boiling points of various monomers and their impurities, thereby improving the production efficiency of rare earth pentamethylene rubber, product molecular weight, Lower overall production costs

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  • Method for producing rare-earth isoprene butadiene rubber
  • Method for producing rare-earth isoprene butadiene rubber

Examples

Experimental program
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Effect test

Embodiment 1

[0068] Embodiment 1, this embodiment belongs to the small-scale test in the laboratory.

[0069] Mix 921g (13.5mol) of industrial polymer grade isoprene (see Table 1-1 for composition) and 183g (3.4mol) of industrial polymer grade 1,3-butadiene (see Table 1-2 for composition) Finally, use an ordinary distillation device to distill off dissolved oxygen, dimers and polymerization inhibitor p-tert-butylcatechol, so that the dissolved oxygen content is less than 0.0005%, the dimer content is less than 0.005%, and the polymerization inhibitor content is less than 0.0001%. .

[0070] Then, use dry spherical alumina and molecular sieves to soak until the water content is less than 0.002% under the protection of high-purity nitrogen to obtain 1000 g of refined mixed monomers, and the molar ratio of isoprene to butadiene is 4:1.

[0071] Soak 6000g of industrial hexane (see Table 1-3 for composition) with dry spherical alumina and molecular sieves until the water content is less than ...

Embodiment 2

[0085] Embodiment 2, this embodiment belongs to the intermediate scale-up test.

[0086] 460.3 (6.77kmol) of industrial polymer grade isoprene (see Table 1-1 for composition) and 91.4kg (1.7kmol) of industrial polymer grade 1,3-butadiene (see Table 1-2 for composition) After mixing, use a tower with an internal diameter of 400 mm and a packing height of 10 m to intermittently distill, and extract 540 kg of a mixture of isoprene and butadiene from a packing height of 2 m, and the molar ratio of isoprene and butadiene is 4:1. Its moisture is 0.01%, dimer is 0.005%, and polymerization inhibitor p-tert-butylcatechol is 0.0001%. Then the mixture is sequentially passed through two adsorption drying towers respectively equipped with spherical alumina and spherical molecular sieves to obtain 530 kg of refined mixed monomers with a water content of less than 0.002%.

[0087] 1000kg of industrial hexane (see Table 1-3 for composition) was intermittently distilled to a water content of ...

Embodiment 3

[0094] Embodiment 3, this embodiment belongs to the technology that can be directly applied to industrial production after the data of the small test and the pilot test are enlarged by the project.

[0095] Fresh polymer grade isoprene industrial product (composition see Table 1-1) 3222.1kg / h (47.38kmol / h) and fresh polymer grade 1,3-butadiene industrial product (composition see Table 1-2) 639.8kg / h (11.9kmol / h) is mixed online and added to the fresh monomer rectification tower T1 to remove dissolved oxygen, water, dimers and inhibitor p-tert-butylcatechol. The number of valve trays of the fresh monomer distillation column T1 is 45, the feed is located at the 35th valve tray (starting from the bottom of the tower, the same below), and the side line extraction is located at the 7th valve tray. Full reflux is used. The dissolved oxygen of the mixed monomer extracted from the side line is less than 0.0005%, the water content is 0.01%, the dimer is 0.005%, and the polymerization ...

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Abstract

The invention discloses a method for producing rare-earth isoprene butadiene rubber. Two refined monomers, namely isoprene and 1, 3-butadiene are proportioned and mixed, and subjected to polymerization reaction in the presence of a rare earth catalyst to form random copolymer rubber. A multi-tower circular preparation process flow is adopted, and the problem of low purity of recovered monomers and solvents caused by crossed boiling points of various monomers and impurities thereof is solved, so that the production efficiency and molecular weight of the rare-earth isoprene butadiene rubber areimproved and the whole production cost is reduced. In the rare-earth isoprene butadiene rubber, the molar content of polyisoprene units is 40 to 90 percent, the cis-content in the polyisoprene units is more than 95 percent, the cis-content in polybutadiene units is more than 99 percent, the weight-average molecular weight is 2,000,000 to 3,000,000, the molecular weight distribution is 3 to 7, andthe anti-ageing agent content is 1 to 2 percent. The rare-earth isoprene butadiene rubber copolymer can replace a binary blend of natural rubber (or high cis-isoprene rubber) and butadiene rubber, and has the characteristics of capacity of being easily mixed, low themogenesis, wear resistance, crack growth resistance and the like.

Description

technical field [0001] The invention relates to a production method for continuously producing rare-earth pentamethylene rubber synthesized by copolymerization of isoprene and 1,3-butadiene with a rare-earth catalyst, and belongs to the technical field of polymer materials and production automation. Background technique [0002] The rubber used in the manufacture of automobile tires is generally a ternary mixture of different proportions of isoprene rubber (or natural rubber), butadiene rubber and styrene-butadiene rubber. These three rubbers are synthesized separately and then blended and processed. The use is as follows Disadvantages and drawbacks: [0003] First, the production of three types of synthetic rubber requires three sets of production equipment, and the construction investment is large; [0004] Second, the power consumption of the blending process of the three synthetic rubbers is large; [0005] The third is that it is difficult to achieve uniform mixing du...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F236/08C08F236/06C08F4/52C08C1/14C08J11/02B60C1/00
Inventor 吴国旭王继叶张杰刘晓磊林庆菊何丽霞王浩
Owner FUSHUN YIKESI NEW MATERIAL
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