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Method for polymerizing polymerized continuous solution of aromatic polyamide

A polyaramide and a polymerization method technology, which is applied in the field of continuous solution polymerization of polyaramide prepolymerization, can solve the problems of difficulty in filtration, high viscosity of the prepolymer, regular cleaning and the like

Active Publication Date: 2009-09-02
张瑞业
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Batch polymerization not only has large batch-to-batch differences, but also has the disadvantages of high viscosity of the prepolymer, difficulty in cooling, transfer, and filtration, and the reactor pipe wall is prone to skinning, which requires regular cleaning.

Method used

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  • Method for polymerizing polymerized continuous solution of aromatic polyamide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Add 1500kg of N in diamine dissolving kettle 1, N-dimethylacetamide (DMAC) or N, N-dimethylformamide or hexamethylacetamide or N-dimethylpyrrolidone 9, the system temperature Reduce to 5 degrees, slowly add 150kg of m-phenylenediamine (MPDA) 7 in molten state under stirring, fully stir, after completely dissolving, put into diamine solution temporary storage tank 3 for subsequent use; 141.2kg of pulverized acid chlorides 8 in a solid state, the temperature of the system is adjusted to 50 degrees, and after all of them become uniform liquids, put them into the acid chloride melt temporary storage tank 4 for subsequent use.

[0032] The m-phenylenediamine (MPDA) solution is pumped into the high-speed dynamic mixer 5 with a metering pump at a flow rate of 50 kg / h, and mixed with the acid chloride (IPC) sent with a metering pump at a flow rate of 4.28 kg / h. The mixed reaction solution enters the static mixer 6 pipeline. The mixer or static mixer is cooled with circulating ...

Embodiment 2

[0034] Add 1600kg of N in diamine dissolving kettle 1, N-dimethylacetamide (DMAC) or N, N-dimethylformamide or hexamethylacetamide or N-dimethylpyrrolidone 9, the system temperature Reduce to 20 degrees, slowly add 180kg of m-phenylenediamine (MPDA) 7 in a solid state under stirring, fully stir, after completely dissolving, put into diamine solution temporary storage tank 3 for subsequent use; add in acid chloride melting kettle 2 271.08 kg of pulverized acid chlorides 8 in a solid state, the temperature of the system was adjusted to 65 degrees, and after all of them became uniform liquids, they were put into the acid chloride melt temporary storage tank 4 for subsequent use.

[0035] The m-phenylenediamine (MPDA) solution is pumped into the high-speed dynamic mixer 5 with a metering pump at a flow rate of 80 kg / h, and mixed with the acid chloride (IPC) sent with a metering pump at a flow rate of 12.18 kg / h. The mixed reaction solution enters the static mixer 6 pipeline. The ...

Embodiment 3

[0037] Add 1800kg of N in diamine dissolving kettle 1, N-dimethylacetamide (DMAC) or N, N-dimethylformamide or hexamethylacetamide or N-dimethylpyrrolidone 9, the system temperature Reduce to 30 degrees, slowly add 230kg of m-phenylenediamine (MPDA) 7 in a solid state under stirring, fully stir, after completely dissolving, put into diamine solution temporary storage tank 3 for subsequent use; add in acid chloride melting kettle 2 The acid chloride 8 of the pulverized solid state of 432kg, system temperature is adjusted to 70 degree, after treating that all become uniform liquid, put into acid chloride melt temporary storage tank 4 for subsequent use.

[0038] The m-phenylenediamine (MPDA) solution is pumped into the high-speed dynamic mixer 5 with a metering pump at a flow rate of 100 kg / h, and mixed with the acid chloride (IPC) sent with a metering pump at a flow rate of 21.28 kg / h. The mixed reaction solution enters the static mixer 6 pipeline. The mixer or static mixer is...

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Abstract

The invention provides a method for polymerizing polymerized continuous solution of aromatic polyamide, belonging to the technical field of methods for preparing aromatic polyamide. The method mainly comprises the following steps: diamine is dissolved by organic solvent into solution of a certain concentration; acyl chloride is added to a melting pot to be melted into solution; the two solutions, after being mixed according to a certain proportion for a certain time by a static mixer, react at a certain temperature at a certain speed to generate prepolymer solution; and after the prepolymer solution is preneutralized and filtered for the first time, isophthaloyl dichloride is added to the prepolymer solution, and the new solution generated is preneutralized and filtered for the second time, polymer solution, i.e., spinning solution is prepared, wherein the spinning solution can be used for spinning to produce aromatic polyamide fiber through spinning and pulping to produce pulp. The invention provides the method for preparing prepolymer of the aromatic polyamide polymer with continuous solution polymerization process. The continuous prepolymerization of aromatic polyamide can eliminate the batch difference from the discontinuous prepolymerization of the aromatic polyamide and improves the uniformity of prepolymer solution and the spinning solution; the prepolymer has moderate viscosity and is convenient to cool, convey and filter; and the wall of a reactor is not easy to crust. The invention consumes less energy, simplifies production and control processes and has low cost.

Description

technical field [0001] The invention relates to a prepolymerization reaction in a polyarylamide production polymerization method, in particular to a continuous solution polymerization method for polyarylamide prepolymerization. Background technique [0002] Polyaramid fiber is a representative variety of high-performance fibers—an important member of the aromatic polyamide fiber (aramid fiber) series. Also known as "aramid 1313". With many superior properties such as high strength, high modulus, high temperature resistance, flame retardancy, radiation resistance, and chemical corrosion resistance, it is an important basic material supporting the development of high-tech industries such as aerospace, energy industry, ocean development, and environmental protection. [0003] Polyaramid was successfully developed by DuPont of the United States, and it was put into industrial production in 1967. The product registration is . For a long time, the world's polyaramid market has...

Claims

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Application Information

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IPC IPC(8): C08G69/32
Inventor 卢志良
Owner 张瑞业
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