A process for preparing nylon 11 by normal pressure melt polymerization of 11-aminoundecanoic acid

A technology of melt polymerization and undecanoic acid, which is applied in the field of nylon manufacturing, can solve the problems of reducing equipment cost, monomer loss, and high equipment requirements, and achieve the effect of reducing equipment cost, reducing equipment requirements, and reducing loss

Active Publication Date: 2016-04-27
CHINA BLUESTAR CHENGRAND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention aims to solve the need to pressurize and melt 11-aminoundecanoic acid in the synthesis of nylon 11 in the prior art, which has high requirements for equipment, high-pressure equipment is needed, and the amino Undecanoic acid will also be taken out with water vapor, causing the problem of monomer loss. A process for preparing nylon 11 by melting and polymerizing 11-aminoundecanoic acid under normal pressure is provided, which can synthesize nylon 11 under normal pressure. Reduced equipment cost and reduced loss of 11-aminoundecanoic acid monomer

Method used

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  • A process for preparing nylon 11 by normal pressure melt polymerization of 11-aminoundecanoic acid

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Effect test

Embodiment 1

[0030] 11-Amino undecanoic acid atmospheric pressure melt polymerization to prepare nylon 11 process:

[0031] Mix 11-aminoundecanoic acid with a flux, and the flux is one or a variety of organic solvents with a boiling point of 185-220°C in any proportion; under normal pressure, heat the material to melt, and then continue to heat Raise the temperature to 230°C to evaporate the flux and the water generated by the reaction; after the normal pressure melting reaction is completed, continue to maintain the temperature at 230°C, then vacuumize and carry out the vacuum reaction in a vacuum state; stop vacuuming after the vacuum reaction is completed, Return to the normal pressure state, and discharge to obtain nylon 11; in the process of preparing nylon 11 by normal pressure melt polymerization of 11-aminoundecanoic acid, catalysts and auxiliary agents are also added.

Embodiment 2

[0033] 11-Amino undecanoic acid atmospheric pressure melt polymerization to prepare nylon 11 process:

[0034] Mix 11-aminoundecanoic acid with a flux, and the flux is one or a variety of organic solvents with a boiling point of 185-220°C in any proportion; under normal pressure, heat the material to melt, and then continue to heat Raise the temperature to 270°C to evaporate the flux and the water generated by the reaction; after the normal pressure melting reaction is completed, continue to maintain the temperature at 270°C, then vacuumize, and carry out the vacuum reaction in a vacuum state; stop vacuuming after the vacuum reaction is completed, Return to the normal pressure state, and discharge to obtain nylon 11; in the process of preparing nylon 11 by normal pressure melt polymerization of 11-aminoundecanoic acid, catalysts and auxiliary agents are also added.

Embodiment 3

[0036] 11-Amino undecanoic acid atmospheric pressure melt polymerization to prepare nylon 11 process:

[0037]Mix 11-aminoundecanoic acid with a flux, and the flux is one or a variety of organic solvents with a boiling point of 185-220°C in any proportion; under normal pressure, heat the material to melt, and then continue to heat Raise the temperature to 250°C to evaporate the flux and the water generated by the reaction; after the normal pressure melting reaction is completed, continue to maintain the temperature at 250°C, then vacuumize and carry out the vacuum reaction in a vacuum state; stop vacuuming after the vacuum reaction is completed, Return to the normal pressure state, and discharge to obtain nylon 11; in the process of preparing nylon 11 by normal pressure melt polymerization of 11-aminoundecanoic acid, catalysts and auxiliary agents are also added.

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Abstract

The invention relates to a technology for preparing nylon 11 by 11-aminoundecanoic acid normal-pressure melt polymerization. The technology comprises the following steps of mixing 11-aminoundecanoic acid and a fluxing agent which comprises one or more organic solvents having any ratio and multiple boiling points of 185-220 DEG C, carrying out heating under normal pressure so that the mixture is melted, sequentially carrying out heating to a temperature of 230-270 DEG C so that the fluxing agent and reaction product water are evaporated, after the normal-pressure melting reaction, continuously keeping the temperature in a range of 230-270 DEG C, carrying out vacuum pumping, carrying out a vacuum reaction process in vacuum, after the vacuum reaction process, stopping the vacuum pumping, recovering a normal pressure state and discharging nylon 11. The technology can reduce an equipment cost and reduce 11-aminoundecanoic acid monomer loss.

Description

technical field [0001] The invention relates to a process for preparing nylon 11, more specifically, the invention relates to a process for preparing nylon 11 by normal-pressure melt polymerization of 11-aminoundecanoic acid, which belongs to the technical field of nylon manufacture. Background technique [0002] Nylon 11 is a long carbon chain soft nylon with long methylene chain and low amide group density. Compared with other nylons, it has very low water absorption, good dimensional stability, mechanical properties, and chemical resistance. And electrical insulation performance, excellent impact resistance at low temperature (-40°C); has elastic memory effect, when the external force is removed, it can return to its original shape, good stress crack resistance, embedded in metal parts and not easy to crack; and easy to process Molding, harmless to the human body, can meet the injection molding and extrusion processing of various melt viscosity ranges, and is often used i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G69/08C08G69/04
Inventor 沈佶周楠宋升
Owner CHINA BLUESTAR CHENGRAND CO LTD
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