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Preparation method and polymerization equipment of acrylonitrile base carbon fiber spinning solution

An acrylonitrile-based carbon fiber and polymerization reaction technology, which is applied in the fields of fiber chemical characteristics, textiles and papermaking, can solve the problems of material properties and structure inhomogeneity, and achieve good mixing effect, uniform chemical structure and improved reaction degree.

Active Publication Date: 2010-07-07
KINGFA SCI & TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method for preparing acrylonitrile-based carbon fiber spinning solution, so as to solve the problem of inhomogeneous material properties and structure in the existing preparation method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1: Weigh 20Kg of dimethyl sulfoxide, 6.336Kg of acrylonitrile, 132g of acrylamide and 66g of itaconic acid, pour them into a 50L reaction kettle in turn, stir and dissolve completely, and bubbling argon for 20min to remove the solution and Air in the kettle, and hot water at 50°C is passed through the jacket of the reactor. When the material temperature is 50°C, 36.3g of azobisisoheptanenitrile is added, and the reaction starts. After 30 minutes, the twin-screw reaction extruder is turned on to circulate the material. The output of the extruder is 50Kg / h, and the temperature of the extruder jacket is kept at 50 °C. At the same time, 3.4 kg of dimethyl sulfoxide and 66 g of itaconic acid were added to the feeding tank of the extruder, and the feeding was completed within 3 hours with a metering pump. Discharge after 15h of polymerization. The conversion rate was 92.6%, the weight-average molecular weight was 158,000, and the molecular weight distribution coe...

Embodiment 2

[0027] Embodiment 2: Weigh 20Kg of dimethyl sulfoxide, 6.336kg of acrylonitrile, 132g of acrylamide and 66g of itaconic acid, pour them into a 50L reactor successively, and after stirring and dissolving completely, bubbling argon for 20min to remove the solution and Air in the kettle, and hot water at 45°C is passed through the jacket of the reactor. When the temperature of the material is 50°C, 46.2g of azobisisoheptanenitrile is added, and the reaction starts. After 30 minutes, two twin-screw reaction extruders connected in series are turned on to circulate the material. The output of the extruder is 50Kg / h, and the extruder is kept The jacket temperature was 45°C. At the same time, 3.4 kg of dimethyl sulfoxide and 66 g of itaconic acid were added to the feeding tank of the extruder, and the feeding was completed within 3 hours with a metering pump. Discharge after 20h of polymerization. The conversion rate was 95.1%, the weight average molecular weight was 135,000, and th...

Embodiment 3

[0028] Embodiment 3: Weigh 17.5Kg of dimethyl sulfoxide, 4.85kg of acrylonitrile, 75g of methyl acrylate and 30g of itaconic acid, pour them into a 50L reactor successively, and after stirring and dissolving completely, 20min of argon bubbling to remove The solution and the air in the kettle, and at the same time, the jacket of the reactor is passed through hot water at 60°C. When the material temperature is 60 ℃, add 30.0g of azobisisobutyronitrile, and the reaction starts. After 30 minutes, open two twin-screw reaction extruders in series to circulate the material. The output of the extruder is 50Kg / h. Keep the extruder The jacket temperature was 60°C. At the same time, 2.5 kg of dimethyl sulfoxide and 35 g of itaconic acid were added to the feeding tank of the extruder, and the feeding was completed within 4 hours with a metering pump. Discharge after 12h of polymerization. The conversion rate was 91.6%, the weight-average molecular weight was 132,000, and the molecular w...

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Abstract

The invention discloses a preparation method and polymerization equipment of acrylonitrile base carbon fiber spinning solution. The preparation method is characterized in that solution polymerization is carried out in the polymerization equipment; the polymerization equipment comprises a reaction kettle and a reactive extruder; and the reaction kettle and the reactive extruder are connected with each other and are respectively provided with a temperature regulating device. The invention has the following benefits: the reaction kettle is connected with the reactive extruder; the screw extrusion structure of the reactive extruder can introduce the reaction media and the chemical reaction in the process of extrusion and has the functions of the synthesis reactors besides the function of mixing materials of the traditional extruders; the reactive extruder can further process high viscosity materials and continuously and quickly generate new and thin material surface layers, thus increasing the surface volume ratio of the materials; and the reaction media are uniformly distributed in the materials and the degree of reaction is improved.

Description

technical field [0001] The invention relates to a technology for preparing acrylonitrile-based carbon fiber spinning solution. Background technique [0002] Because carbon fiber has excellent properties such as high strength, high modulus, high temperature resistance, corrosion resistance, fatigue resistance, creep resistance, electrical conductivity and thermal conductivity, it is an indispensable engineering material in the aerospace industry. It is also widely used in construction and is a high-tech fiber for both military and civilian use. Among them, polyacrylonitrile-based carbon fiber has developed rapidly due to its simple production process and good mechanical properties, and has become the most important and absolute variety. Since the properties of polyacrylonitrile-based carbon fibers depend to a large extent on the properties of carbon fiber precursors, the quality of spinning dope is the premise and basis for preparing high-quality precursor fibers. The curre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/44C08F2/01C08F2/06D01F9/22
Inventor 宋威黄险波代惊奇辛伟黄有平马雷
Owner KINGFA SCI & TECH CO LTD
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