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Raw material premixing method for preparing rare earth isoprene rubber

A rare earth isoprene rubber and raw material technology, applied in chemical instruments and methods, mixers, fluid mixers, etc., can solve the problems of low production capacity, which can only reach 85-90wt%, and achieve the effect of improving catalytic efficiency

Active Publication Date: 2012-07-11
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the disadvantage of this premixing device is that the average residence time of the material in the premixing tank is a long time of 20-30min, and then after the reaction of multiple polymerization reactors connected in series, the final conversion rate can only reach 85-90wt %, so the production capacity is relatively low

Method used

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  • Raw material premixing method for preparing rare earth isoprene rubber
  • Raw material premixing method for preparing rare earth isoprene rubber
  • Raw material premixing method for preparing rare earth isoprene rubber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] At normal temperature and pressure, firstly, the isoprene monomer (23.5kg / h, polymerization grade, commercially available), solvent (152kg / h, used here) in the polymerization reaction material used to prepare rare earth isoprene rubber 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 himself and the prepared neodymium catalyst is diluted to the above concentration with cyclohexane) in a traditional heat exchanger for precooling, the precooling temperature is - 5°C. Among them, the catalyst and the solvent are pre-mixed and then pre-cooled by a heat exchanger, and the isoprene monomer is pre-cooled in a separate heat exchang...

Embodiment 2

[0044] Basically repeat Example 1, except that the Q of the loop mixer is made r / Q out for 125.

[0045] According to this example, the final conversion of isoprene monomer was 96 wt%.

[0046] 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

[0048] Basically repeat Example 1, except that the Q of the loop mixer is made r / Q out for 140.

[0049] According to this example, the final conversion of isoprene monomer was 96.3 wt%.

[0050] 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 raw material premixing method for preparing rare earth isoprene rubber. The method comprises the steps of introducing precooled polymerization reactants into a ring tube mixer, and under the action of an axial-flow pump, subjecting the polymerization reactants to quick circularly flowing in the ring tube mixer, thereby violently mixing under a turbulent flow condition to form highly uniform polymerization reaction materials. By utilizing the method of the invention, since the highly uniform polymerization reaction material can be formed, the cis-1,4-polyisoprene rubber configuration content, the number-average molecular weight and the polydispersity index of the rare earth isoprene rubber product can be correspondingly improved, i.e., the quality of the obtained rare earth isoprene rubber product can be significantly improved.

Description

technical field [0001] The invention relates to a raw material premixing method for preparing rare earth isoprene rubber, in particular to a method for premixing rare earth isoprene rubber raw materials by using a loop mixer. 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 isopr...

Claims

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Application Information

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IPC IPC(8): B01F5/00C08F136/08C08F4/54C08F4/52
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