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Pre-mixing process in rare-earth isoprene rubber production process

A rare earth isoprene rubber and production process technology, applied in the field of premixing process, can solve problems such as poor dispersibility of catalysts, monomers and solvents, and achieve the effects of good technical characteristics, reduced energy consumption, no corrosion and pollution

Inactive Publication Date: 2010-11-10
ZIBO LUHUA HONGJIN NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a premixing process in the production process of rare earth isoprene rubber that realizes efficient premixing reaction for the problem of poor dispersion of catalyst, monomer and solvent during isoprene solution polymerization

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0035] The isoprene monomer flow rate is 2.5L / h, the solvent flow rate is 15L / h, the rare earth catalyst flow rate is 1L / h, the pipeline pump 13 rotates at 3000r / min, the power is 1.1kw, and the solvent in the premixing tank 14 is 9 liter, the average residence time is 29 minutes, using full mixed flow stirring, the polymerization kettle 15 is three 30-liter kettles connected in series. The Mooney viscosity range of the produced isoprene rubber is 75-85, the molecular weight distribution is 2.7, and other indicators are qualified. The amount of catalyst after the premixing device is 3×10 -6 mol / g monomer.

[0036] Other conditions remain the same, without premixing device, the amount of catalyst is 5×10 -6 mol / g monomer, the molecular weight distribution is 3.9, the molecular weight distribution is obviously broadened, and the product quality is unqualified.

Embodiment 2

[0038] Isoprene monomer flow rate 2m 3 / h, the solvent flow rate is 12.5m 3 / h, the rare earth catalyst flow rate is 0.5m 3 / h, pipeline pump 13 rotating speed is 1500r / min, power is 15kw, stator and rotor gap is 2mm, solvent in the premixing tank is 6m 3 , the average residence time is 24 minutes, using full mixed flow stirring, discharging from the bottom of the premixing tank 14, feeding from the bottom of the first polymerization tank 15, and the polymerization tank 15 is 6 sets of 12m 3 The kettles are connected in series. The Mooney viscosity range of the produced isoprene rubber is 73-80, the molecular weight distribution is 2.6, and other indicators are qualified. The amount of catalyst after the premixing device is 2.4×10 -6 mol / g monomer.

[0039] Other conditions remain the same, without premixing device, the amount of catalyst is 3.6×10 -6 mol / g monomer, the molecular weight distribution is 3.5, the molecular weight distribution is obviously broadened, and th...

Embodiment 3

[0041] Isoprene monomer flow rate 4.8m 3 / h, the solvent flow rate is 30m 3 / h, the rare earth catalyst flow rate is 1.2m3 / h, pipeline pump 13 rotating speed is 1500r / min, power is 37kw, stator and rotor gap is 2mm, and the solvent in the premixing tank is 12m 3 , the average residence time is 20 minutes, using full mixed flow stirring, discharging from the bottom of the premixing kettle 14, feeding from the bottom of the first polymerization kettle 15, and the polymerization kettle 15 is 6 sets of 20m 3 The kettles are connected in series. The Mooney viscosity range of the produced isoprene rubber is 60-70, the molecular weight distribution is 2.3, and other indicators are qualified. The amount of catalyst after the premixing device is 2.7×10 -6 mol / g monomer.

[0042] Other conditions remain the same, without premixing device, the amount of catalyst is 3.5×10 -6 mol / g monomer, the molecular weight distribution is 3.5, the molecular weight distribution is obviously broa...

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Abstract

The invention relates to a pre-mixing process in a process for producing rare-earth isoprene rubber through isoprene solution polymerization by using a rare-earth catalyst. The pre-mixing process is characterized by comprising the following steps of: pre-mixing the rare-earth catalyst, an isoprene monomer and a solvent in a pre-mixing device consisting of a pipeline high-speed mixer and a pre-mixing kettle (14), and then injecting the mixture into a polymerization kettle. Aiming at the problems of poor dispersion of the catalyst, the monomer and the solvent during the isoprene solution polymerization, the process realizes efficient pre-mixing reaction of the rare-earth isoprene rubber. The rare-earth isoprene rubber can be widely applied to tyres and other rubber products, can be mixed with other rubbers, is particularly suitable for food and medicament industries such as artificial respiratory organs and the like, and is more suitable on the sanitation aspect compared with natural rubber and titanium rubber.

Description

technical field [0001] The invention relates to a premixing process in the process of producing isoprene rubber by isoprene solution polymerization with a rare earth catalyst. Background technique [0002] As an industrial commodity, isoprene rubber is a translucent, odorless, hydrocarbon-soluble elastomer. Its head-to-tail connected 1,4-cis macromolecular structure is similar to natural rubber, except that it is purer and less It needs to be refined. [0003] The production of rare earth isoprene rubber is still blank in China; in foreign countries, continuous solution polymerization is usually used. The three materials of rare earth catalyst, isoprene monomer and solvent are injected into the polymerization tank according to a certain ratio through the metering pump, and the polymerization is carried out by Multiple kettles are connected in series, and the polymerization temperature is gradually increased to reach a conversion rate of 85-90%. A stirring paddle should be ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F136/08
Inventor 崔广军姜东成
Owner ZIBO LUHUA HONGJIN NEW MATERIAL CO LTD
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