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Liquid polyisoprene, preparation method and application thereof

A technology of polyisoprene and isoprene, which is applied in the field of liquid polyisoprene and its preparation and application, can solve the problems of unfavorable health of operators, cumbersome operation, unfavorable environmental protection, etc., and achieve easy operation And environmental protection, narrow molecular weight distribution, and the effect of improving economy

Active Publication Date: 2014-12-31
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existence of such a large amount of water will inevitably consume a lot of expensive organolithium initiators; moreover, it is also necessary to dissolve water in a large amount of organic solvents such as benzene, and then add it to the polymerization system. The presence of organic solvents, on the one hand, increases the workload of the subsequent solvent removal process, and on the other hand, a large amount of organic solvents such as benzene is also harmful to the health of operators. In addition, a large amount of organic solvents such as benzene is not conducive to environmental protection

Method used

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  • Liquid polyisoprene, preparation method and application thereof
  • Liquid polyisoprene, preparation method and application thereof
  • Liquid polyisoprene, preparation method and application thereof

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preparation example Construction

[0018] The invention provides a method for preparing liquid polyisoprene, the method comprising: under anionic polymerization conditions, contacting isoprene with an organolithium initiator and water in a solvent; wherein, water and the The molar ratio of the organic lithium initiator is 0.9-9:100.

[0019] According to the method of the present invention, the molar ratio of water to the organolithium initiator is 0.9-9:100. When the molar ratio of water to the organolithium initiator is within the above range, the molecular weight distribution of the finally obtained polyisoprene can reach below 1.10, and in the obtained polyisoprene, isoprene is The content of the structural unit formed by 1,4-polymerization is high, which can reach more than 96.9 mole % (under the preferred condition, it can reach more than 97 mole %). And, since the molar ratio of water to the organolithium initiator is only 0.9-9:100, therefore, in theory, based on 100 moles of the organolithium initiato...

Embodiment 1

[0051] This example is used to illustrate the liquid isoprene and its preparation and use according to the present invention.

[0052] The polymerization was carried out in a 5L polymerization reactor. After the polymerization system was replaced by high-purity nitrogen, 200g of isoprene monomer and 1800g of dry cyclohexane were sequentially added to the polymerization reactor, deionized water was added to the polymerization reactor under stirring, and the stirring was continued for about 10 minutes and heating to 40°C, then at this temperature, add 15.8mL of n-butyllithium solution with a concentration of 0.3M in n-hexane to start the polymerization reaction. During the polymerization reaction, the temperature is controlled within the range of 40-50°C, and the polymerization reaction The pressure in the kettle was controlled to be 0.1-0.3 MPa (gauge pressure), and the polymerization was carried out for 120 minutes. Wherein, the molar percentage of deionized water and organic...

Embodiment 2

[0058] This example is used to illustrate the liquid isoprene and its preparation and use according to the present invention.

[0059] The isoprene was polymerized using the same method as in Example 1, except that the molar ratio of deionized water to organolithium initiator was 2:100. The isoprene conversion was 100% determined by weighing. The prepared liquid polyisoprene was characterized and the results are shown in Table 1.

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Abstract

The invention provides a liquid polyisoprene, a preparation method and an application thereof. The method comprises contacting isoprene with an organic lithium initiator and water in a solvent under an anionic polymerization conditions, wherein a mole ratio of the water and the organic lithium initiator is 0.9-9 : 100. The liquid polyisoprene is narrow in molecular weight distribution, and high in content of such a structural unit formed from the isoprene through a 1,4-polymeration way. In addition, the method provided by the invention is simple to operate and environmental-protective. The liquid polyisoprene is especially suitable for being used as plasticizers or softeners of natural rubber.

Description

technical field [0001] The invention relates to a liquid polyisoprene and its preparation method and application. Background technique [0002] Usually, liquid polyisoprene is a viscous flowable liquid with a number-average molecular weight not higher than 100,000. Its main advantages are: easy to operate, can be molded by pouring or injection, simple equipment, and convenient construction; It produces various rubber products from rubber shoes, industrial products to tires, etc.; it is the best processing aid in the rubber industry, and can be used as a plasticizer, softener, co-vulcanizing agent and modifier, etc., and can also be used as an additive in the plastics industry Plasticizers and potting agents, coating agents and asphalt modifiers in the electronics industry. In addition, liquid polyisoprene can also be widely used to make various coatings, such as anti-corrosion coatings, low-temperature coatings, electrical insulation coatings, water-soluble coatings and ele...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L9/00C08K5/13C08F136/08C08F4/48C08F2/42C08L7/00
Inventor 贺小进王世朝解希铭李传清康新贺王妮妮刘辉石建文李延良
Owner CHINA PETROLEUM & CHEM CORP
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