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Polymerization method for preparing rare earth isoprene rubber

A technology of rare earth isoprene rubber and polymerization method, which is applied in the field of rubber polymerization, which can solve the problems of decreased quality of polymerized products, increased material viscosity, uneven material concentration, and uneven temperature distribution, and achieves the effect of ensuring quality

Active Publication Date: 2012-07-04
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is because if the heat of polymerization reaction cannot be removed in time, the temperature in the first reaction kettle will continue to rise, and the conversion rate will continue to increase, resulting in a continuous increase in the viscosity of the material in the kettle, and a decrease in the mass transfer and heat transfer effects in the kettle, making the reaction The concentration and temperature distribution of the material in the kettle is uneven, which in turn affects the polymerization process in the subsequent reaction kettle, resulting in a decrease in the quality of the obtained polymerization product

Method used

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  • Polymerization method for preparing rare earth isoprene rubber
  • Polymerization method for preparing rare earth isoprene rubber
  • Polymerization method for preparing rare earth isoprene rubber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Under normal temperature and pressure, firstly, the isoprene monomer (23.5kg / h, polymerization grade, commercially available), solvent (152kg / h, used here The solvent is cyclohexane, commercially available) and neodymium catalyst (4.5kg / h, the concentration is 6×10 -6 molNd / ml, the solvent is cyclohexane, and the specific composition of the neodymium catalyst used here is isoprene according to the molar ratio of each component: neodymium neodecanoate: triisobutylaluminum: diethyl chloride Aluminum=50:1:10:3, the catalyst is prepared by the applicant and the prepared neodymium catalyst is diluted to the above concentration with cyclohexane) premixed in a traditional kettle premixer, the premixing time 10min.

[0047] Then, follow figure 2 The scheme shown operates by feeding the polymerization reaction mass formed after premixing into the loop reactor. Under the action of the axial flow pump, the polymerization reaction material circulates rapidly in the loop reactor...

Embodiment 2

[0052] Example 1 is basically repeated, except that the Q of the loop reactor is made r / Q out for 100.

[0053] According to this embodiment, after the reaction in the loop reactor, the outlet conversion rate of isoprene monomer reaches 54wt%. The final conversion of monomer reached 97 wt%, and the temperature in the third full mixing tank rose to 50°C.

[0054] The quality analysis results of the rare earth isoprene rubber product obtained after the completion of the reaction are listed in Table 1 below.

Embodiment 3

[0056] Example 1 is basically repeated, except that the Q of the loop reactor is made r / Q out for 120.

[0057] According to this embodiment, after the reaction in the loop reactor, the outlet conversion rate of isoprene monomer reaches 56wt%, and after continuing the adiabatic reaction in the second and third fully mixed tanks in series, the isoprene The final conversion of monomer reached 97.5 wt%, and the temperature in the third full mixing tank rose to 51 °C.

[0058] The quality analysis results of the rare earth isoprene rubber product obtained after the completion of the reaction are listed in Table 1 below.

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Abstract

The invention relates to a polymerization method for preparing rare earth isoprene rubber, which adopts at least three reactors which are in series connection to conduct a solution polymerization reaction of an isoprene monomer, wherein a first reactor is an annular tube reactor which adopts isothermal operation, a following reactor is a continuous stirrer tank reactor which adopts heat insulation operation. By means of the method, the cis-form-1,4-configuration content of obtained gathering rare earth isoprene rubber can be high as 98wt%, the number-average molar mass can reach over 0.4 million, and molecular weight distribution coefficient is smaller than 3.

Description

technical field [0001] The invention relates to a polymerization method for preparing rubber, in particular to a polymerization method for preparing rare earth isoprene rubber. 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 rare earth catalysts. Rare earth isoprene rubber is also known as "synthetic natural rubber" due to its similar physical and mechanical properties to natural rubber (NR). 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 those of 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 fi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F136/08C08F2/06C08F2/01C08F4/54C08F4/52
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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