High-concentration continuous and stable polymerization method and system for poly-p-phenylene terephthamide

A technology for poly(p-phenylene terephthalamide) and terephthaloyl chloride, which is applied in the field of polymer synthesis, can solve problems such as polymer volume expansion, achieve stable dissolution time, reduce production cost, and eliminate storage time. different effects

Active Publication Date: 2018-10-09
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Solve the effect of polymer volume expansion in the later stage of po

Method used

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  • High-concentration continuous and stable polymerization method and system for poly-p-phenylene terephthamide
  • High-concentration continuous and stable polymerization method and system for poly-p-phenylene terephthamide

Examples

Experimental program
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Effect test

Embodiment 1

[0036] The NMP solution in which calcium chloride was dissolved was cooled to 15°C. Calcium chloride concentration is 8% (mass ratio). NMP / CaCl with a metering pump 2 The solution is continuously metered and transported to the twin-screw dissolver, keeping the flow at 800.00kg / h, of which the flow into the twin-screw dissolver is kept at 300.00kg / h; under the protection of nitrogen, the PPD solid particles are continuously metered and transported to the twin-screw with a weight loss scale In the dissolver, the feed rate of PPD is 50.00kg / h. The twin-screw continuous dissolver is a Ф73 co-rotating twin-screw extruder with an aspect ratio of 20. The screw installation is inclined at 5°. The p-phenylenediamine was continuously dissolved and gradually cooled to 13°C in a twin-screw continuous dissolver. Use a high-speed stirrer to mix the remaining 500.00kg / h of NMP / CaCl 2 Solution and PPD / NMP / CaCl at screw outlet 2 The solutions are mixed and then passed into storage tanks ...

Embodiment 2

[0038] The NMP solution in which calcium chloride was dissolved was cooled to 10 °C. Calcium chloride concentration is 12% (mass ratio). NMP / CaCl with a metering pump 2 The solution is continuously metered and delivered to the twin-screw dissolver, keeping the flow at 1600.00kg / h, of which the flow into the twin-screw dissolver is kept at 800.00kg / h; under the protection of nitrogen, the PPD solid particles are continuously metered and delivered to the twin-screw with a weight loss scale In the dissolver, the feed rate of PPD is 120.00kg / h. The twin-screw continuous dissolver is a Ф100 type co-rotating twin-screw extruder with an aspect ratio of 10. The screw is installed with an inclination of 3°. The p-phenylenediamine was continuously dissolved in a twin-screw continuous dissolver and its temperature was stabilized at 10 °C. Use a static pipeline mixer to mix the remaining 800.00kg / h of NMP / CaCl 2 Solution and PPD / NMP / CaCl at screw outlet 2 The solutions are mixed and...

Embodiment 3

[0040] The NMP solution in which calcium chloride was dissolved was cooled to 15°C. Calcium chloride concentration is 10% (mass ratio). NMP / CaCl with a metering pump 2 The solution is continuously metered and transported to the twin-screw dissolver, and the flow rate is kept at 1200.00kg / h, of which the flow rate entering the twin-screw dissolver is kept at 500.00kg / h; under the protection of nitrogen, the PPD solid particles are continuously metered and transported to the twin-screw with a weight loss scale In the dissolver, the feed rate of PPD is 80.00kg / h. The twin-screw continuous dissolver is a Ф100 type co-rotating twin-screw extruder with an aspect ratio of 10. The screw installation is inclined at 2°. The p-phenylenediamine was continuously dissolved in a twin-screw continuous dissolver and the temperature was maintained at 15°C. Using a high-speed stirrer to mix the remaining 700.00kg / h of NMP / CaCl 2 Solution and PPD / NMP / CaCl at screw outlet 2The solutions are ...

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Abstract

The invention relates to a high-concentration continuous and stable polymerization method and system for poly-p-phenylene terephthamide, and belongs to the technical field of polymer synthesis. The high-concentration continuous and stable polymerization of the poly-p-phenylene terephthamide is an important challenge in the field of para-aramid, and the high-concentration continuous and stable dissolving of the poly-p-phenylene terephthamide and dual-screw stable and continuous polymerization are two keys. According to The high-concentration continuous and stable polymerization method and system for the poly-p-phenylene terephthamide, one set of dual-screw system is designed to continuously dissolve PPD (Para Phenylene Diamine), batch differences caused by PPD batch dissolution can be eliminated, and in addition, the problem of hydrotropy salt calcium chloride precipitation caused by high-concentration PPD is eliminated; two groups of dual-screw reactors subjected to no-dead-corner connection are used for realizing the continuity and the stability of PPTA polymerization through different volumes and function configurations of two groups of dual screws. According to the method, the stability of the PPTA polymerization can be improved, in addition, the high-concentration continuous polymerization can be realized, production efficiency is greatly improved, and production cost is lowered.

Description

technical field [0001] The invention relates to a high-concentration continuous and stable polymerization method of poly-p-phenylene terephthalamide and a system thereof, belonging to the technical field of polymer synthesis. Background technique [0002] Para-aramid fiber has many excellent properties such as high strength and high modulus, high temperature resistance, solvent resistance, and stable product size. It has important irreplaceable value in aerospace, national defense and many civilian fields. Among them, the continuous and stable polymerization of poly-p-phenylene terephthalamide (hereinafter referred to as PPTA) is one of the keys to produce para-aramid fiber. The commonly used PPTA polymerization method in industry is low temperature solution polycondensation method. That is to say, low-temperature polycondensation of monomer terephthaloyl chloride (hereinafter referred to as TPC) and p-phenylenediamine (hereinafter referred to as PPD) in a composite system ...

Claims

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Application Information

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IPC IPC(8): C08G69/32C08G69/28
CPCC08G69/28C08G69/32
Inventor 庹新林
Owner TSINGHUA UNIV
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