Double helical ribbon pipe type reactor for preparing high-performance polyacrylonitrile-based carbon fiber spinning solution

A technology of polyacrylonitrile-based carbon fiber and tubular reactor, which is applied in the fields of fiber chemical characteristics, climate sustainability, textiles and papermaking, etc. It can solve the problems of unsuitability for industrialization, and achieve the elimination of back-mixing, avoiding adhesion, and long-term reaction the effect of time

Inactive Publication Date: 2010-10-13
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] In summary, although there are many synthetic methods for high molecular weight polyacrylonitrile at present, they are not suitable for industrialization.

Method used

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  • Double helical ribbon pipe type reactor for preparing high-performance polyacrylonitrile-based carbon fiber spinning solution
  • Double helical ribbon pipe type reactor for preparing high-performance polyacrylonitrile-based carbon fiber spinning solution
  • Double helical ribbon pipe type reactor for preparing high-performance polyacrylonitrile-based carbon fiber spinning solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Weigh 871.2g acrylonitrile, 8.8003g itaconic acid, 3117.4g dimethyl sulfoxide, 2.6400g azobisisobutyronitrile, 4000g in total. The temperature of the water bath in the reactor was set at 60° C., and the stirring speed was set at 30 rpm. The temperature measuring thermocouple showed that the difference between the temperature of the water bath and the reaction temperature was less than 3°C during the whole reaction process. After 25 hours, the reaction was stopped, and the measured monomer conversion rate was 90.01%, the viscosity average molecular weight was 197148g / mol, the weight average molecular weight was 230460g / mol, and the molecular weight distribution index was 2.1659.

Embodiment 2

[0037] Weigh 990.0g acrylonitrile, 10.0000g itaconic acid, 2999.0g dimethyl sulfoxide, 1.0000g azobisisobutyronitrile, 4000g in total. The temperature of the water bath in the reactor was set at 60° C., and the stirring speed was set at 60 rpm. The temperature measuring thermocouple showed that the difference between the temperature of the water bath and the reaction temperature was less than 3°C during the whole reaction process. After 25 hours, the reaction was stopped, and the measured monomer conversion rate was 71.38%, the viscosity-average molecular weight was 271708 g / mol, the weight-average molecular weight was 311342 g / mol, and the molecular weight distribution index was 1.8799.

Embodiment 3

[0039] Weigh 871.2g of acrylonitrile, 8.8006g of itaconic acid, 3117.4g of dimethyl sulfoxide, and 2.6403g of azobisisobutyronitrile, totaling 4000g. The temperature of the water bath in the reactor was set at 55° C., and the stirring speed was set at 30 rpm. The temperature measuring thermocouple showed that the difference between the temperature of the water bath and the reaction temperature was less than 3°C during the whole reaction process. After 28 hours, the reaction was stopped, and the measured monomer conversion rate was 86.47%, the viscosity-average molecular weight was 232390 g / mol, the weight-average molecular weight was 267540 g / mol, and the molecular weight distribution index was 2.0212.

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Abstract

The invention relates to a double helical ribbon pipe type reactor, which is particularly suitable for preparing high-performance polyacrylonitrile-based carbon fiber spinning solution. The reactor consists of a mechanical shaft seal, a bearing seat, a transmission chain, a variable-frequency speed reducing motor, a constant-temperature water bath cell, a water bath stirrer and a double helical ribbon stirrer, wherein the double helical ribbon stirrer consists of a stainless steel pipe and a helical ribbon paddle which is arranged in the pipe and has almost the same length as the pipe.

Description

Technical field: [0001] The invention relates to a double-screw ribbon tube reactor, which is especially suitable for the preparation of high-performance polyacrylonitrile-based carbon fiber spinning solution. technical background: [0002] Carbon fiber and its composite material is an important structural material with high technical content. It has a series of advantages such as high specific strength, high specific modulus, light weight, high temperature resistance, corrosion resistance, fatigue resistance and small thermal expansion coefficient. It is widely used in aerospace Aviation, strategic weapons, automobiles, transportation, energy, construction and sporting goods and other fields. In order to produce high-performance carbon fibers, polyacrylonitrile (PAN) precursors with high mechanical properties need to be used, and molecular weight is the most critical factor. This is because, on the one hand, the greater the average molecular weight, the greater the intermo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/44C08F2/04C08F2/01C08F220/46D01F9/22
CPCY02P20/10Y02P70/62
Inventor 程振民缪金根周美华潘鼎
Owner EAST CHINA UNIV OF SCI & TECH
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