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Method for continuous production of polyamide

A technology for polyamide and amidation, which is applied in the field of continuous preparation of polyamide, can solve the problems of increased addition of end group modifiers, difficulty in preparing polyamide, change in residence time, and the like

Inactive Publication Date: 2009-10-28
TOYOBO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, contamination and changes in residence time occur, making it difficult to produce polyamides of the desired quality
[0019] In addition, only the addition of terminal group regulators is used to adjust the concentration of polymer terminal groups. To obtain the desired degree of polymerization, sometimes the amount of terminal group regulators added is increased, resulting in a large amount of terminal group regulators remaining in the polyamide product. Adverse situation

Method used

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  • Method for continuous production of polyamide
  • Method for continuous production of polyamide
  • Method for continuous production of polyamide

Examples

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preparation example Construction

[0085] As the production method using the melt polymerization of polyamide, a production method such as batch type, batch type and solid phase polymerization, and continuous production using a multi-stage polymerization reactor can be performed. The melt viscosity control of the present invention can be used in these conventionally known production methods. However, in continuous production, it is necessary to immediately control the quality of the prepared polymer and feed it back to the production process to produce a polymer of a certain quality for a long time. Therefore, the melt viscosity control of the present invention is particularly preferred for the continuous production of polyamide. .

[0086] The continuous production method of the present invention can be applied to any one of aliphatic polyamides and aromatic-containing polyamides, and the polyamide includes at least one selected from, for example, the above repeating units (I) to (V).

[0087] Polyamide has an aro...

Embodiment 1

[0212] The polyamide prepolymer ([RV]1.61) containing adipic acid and metaxylylenediamine as the main raw materials is supplied to a reaction temperature of 255°C, atmospheric pressure (no vacuum operation), and screw rotation speed of 50rpm. In the reactor SCR of the conditions, the final polymerization is carried out. The flushing amount of nitrogen (purity 99.999% or more) is automatically controlled by the indicated value of the melt viscometer. With an average residence time in SCR of 10 minutes, a polyamide resin with an average [RV] of 2.37 and a standard deviation [σ] of 0.02 was prepared. The average value of [RV] and standard deviation [σ] are calculated from the measurement results of 20 samples taken at intervals of 10 minutes or more.

Embodiment 2

[0214] Except that the vacuum degree in the reactor SCR was set to a fixed value of 865 hPa, the same procedure as in Example 1 was performed. The average value of [RV] of the prepared polyamide resin was 2.38, and the standard deviation [σ] was 0.01.

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Abstract

A continuous preparation method for polyamides, comprising: (a) a raw material blending process in which diamines and dicarboxylic acids are dissolved separately or salts of amines and carboxylic acids are generated in water; (b) the blended raw materials are continuously The raw material introduction process of introducing into the reaction device; (c) the amidation process of passing the introduced raw material in the tubular reaction device to obtain a reaction mixture containing amidation products and condensation water; (d) introducing the above reaction mixture into In a continuous reaction device that can separate and remove water, water is separated and removed at a temperature above the melting point of the polyamide that is finally prepared while providing a degree of polymerization to obtain an initial polymerization process of a polyamide prepolymer; (e) polyamide The prepolymer is introduced into a continuous reaction device that can separate and remove water, and the degree of polymerization is further provided at a temperature above the melting point of the final polyamide to obtain a polyamide with a desired relative viscosity [RV].

Description

[0001] This application is a divisional application with the application number 03820533.5, the filing date being August 27, 2003, and the invention title being the continuous preparation method of polyamide. Technical field [0002] The present invention relates to a continuous preparation method of polyamide with good quality and stable polymerization degree. The continuous production method of the present invention can also be applied to any of aliphatic polyamides and aromatic-containing polyamides, and is preferably applied to aromatic-containing polyamides whose production conditions are more difficult. [0003] Polyamides with aromatic rings have excellent mechanical strength and dimensional stability, and are preferably used in films, sheets, packaging bags, bottles, engineering plastics, fibers, and the like. Background technique [0004] Polyamide resin has excellent physical and mechanical properties, so it is widely used in films, sheets, packaging bags, engineering pl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G69/04
Inventor 辻井康人丸山岳小川薰高田益明小石一寿铃木健太
Owner TOYOBO CO LTD
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