Preparation method of copolyamide and copolyamide

A technology of copolyamide and caprolactam, applied in the field of polyamide, can solve the problems of long preparation process time, unstable product quality, low production efficiency, etc., achieve stable control of process parameters, prolong solid phase viscosity increasing time, and high production efficiency Effect

Pending Publication Date: 2021-10-01
CHINESE TEXTILE ACAD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art, provide a preparation method and copolyamide for increasing the viscosity of copolyamide, and solve the problem of long preparation time and unstable product quality in the preparation of high-viscosity copolyamide 6-mn , low production efficiency and high energy consumption

Method used

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  • Preparation method of copolyamide and copolyamide
  • Preparation method of copolyamide and copolyamide
  • Preparation method of copolyamide and copolyamide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] In this embodiment, the following method is used to prepare copolyamide 6-54:

[0052] a. Add 540kg of fresh molten caprolactam, 227kg nylon 54 salt solution (concentration is 65wt.%), 0.008mol% phosphoric acid (relative to the amount of caprolactam and nylon 54 salt total substance) in the mixed liquid tank every hour, stir to obtain the mixture .

[0053] b. Mix the mixture in the pipeline mixer, and then enter the prepolymerization reactor to polymerize to form a prepolymer. The pressure of the prepolymerization reactor is 15 barg, the temperature is 262°C, and the residence time is 3h.

[0054] c. Send the prepolymer in the prepolymerization reactor to the first amide exchanger, the temperature of the first amide exchanger is 260° C., the residence time is 0.5 h, and the pressure drops from 15 barg to 4 barg.

[0055] d. The material of the first amide exchanger is sent to the first post-reactor, the temperature of the first post-reactor is 260°C, the reaction pres...

Embodiment 11

[0064] In this embodiment, the following method is used to prepare copolyamide 6-54:

[0065] a. Add 540kg fresh melting caprolactam, 227kg nylon 54 salt solution (concentration is 65wt.%), 0.008mol% phosphoric acid (relative to the amount of total substance of caprolactam and nylon 54 salt) in the mixed liquid tank every hour, stir to obtain the mixture .

[0066] b. Mix the mixture in the pipeline mixer, and then enter the prepolymerization reactor to polymerize to form a prepolymer. The pressure of the prepolymerization reactor is 15 barg, the temperature is 262°C, and the residence time is 3h.

[0067] c. Send the prepolymer in the prepolymerization reactor to the first amide exchanger, the temperature of the first amide exchanger is 260° C., the residence time is 0.5 h, and the pressure drops from 15 barg to 4 barg.

[0068] d. Send the material of the first amide exchanger to the first after-reactor, the temperature of the first after-reactor is 255° C., the reaction pr...

Embodiment 21

[0075] In this embodiment, the following method is used to prepare copolyamide 6-1012:

[0076] a. 540kg of fresh melting caprolactam, 25kg nylon 54 salt solution (concentration is 65wt.%), 0.003mol% sodium hypophosphite (relative to the amount of caprolactam and nylon 1012 salt total substance) is added in the mixed liquid tank every hour, stir, to get the mixture.

[0077] b. Mix the mixture in the pipeline mixer, and then enter the prepolymerization reactor to polymerize to form a prepolymer. The pressure of the prepolymerization reactor is 20 barg, the temperature is 266°C, and the residence time is 2h.

[0078] c. Send the prepolymer in the prepolymerization reactor to the first amide exchanger, the temperature of the first amide exchanger is 260° C., the residence time is 0.5 h, and the pressure drops from 15 barg to 4 barg.

[0079] d. Send the material of the first amide exchanger to the first after-reactor, the temperature of the first after-reactor is 255° C., the r...

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Abstract

The invention discloses a preparation method of copolyamide, wherein the preparation method is characterized in that at least caprolactam and nylon diamine diacid salt are used as raw materials to prepare the copolyamide through a continuous process, and a catalyst is added in any link of material mixing, amide exchange reaction in a polymerization stage, extraction and drying in the preparation process of the copolyamide. The copolyamide prepared by the method has the characteristics of high production efficiency, high process operability, low energy consumption and the like. The prepared copolyamide is stable in quality and excellent in performance.

Description

technical field [0001] The invention belongs to the technical field of polyamides, and in particular relates to a preparation method of copolyamides and copolyamides. Background technique [0002] Copolyamide 6-mn, as a modified polyamide 6 variety, is a differentiated product of polyamide 6 that has attracted much attention in recent years. Copolyamide 6-mn with a relative molecular weight of more than 30,000 has higher melt strength, and its finished products have higher mechanical properties and barrier properties. It is an excellent raw material for engineering plastics, films, fibers, and industrial filter felts. [0003] The melt dynamic viscosity of copolyamide 6-mn increases rapidly with the increase of molecular weight. Higher operating temperature is required to improve fluidity for molding and pelletizing, but it will cause product degradation. Therefore, it is difficult to achieve high temperature at the outlet of continuous polymerization reactor in engineering....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G69/36C08G69/04
CPCC08G69/36C08G69/04
Inventor 姜锋于春晓李鑫邱志成黄玉民胡志宇王雪
Owner CHINESE TEXTILE ACAD
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