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Method for improving molecular weight of copolyamide and product thereof

A technology of copolyamide and molecular weight, which is applied in the field of polyamide, can solve the problems of long preparation process time, unstable product quality, low molecular weight of products, etc., achieve stable control of process parameters, prolong the time of solid phase viscosity increase, and process controllability strong effect

Pending Publication Date: 2021-10-29
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 a copolyamide with uniform distribution while increasing the molecular weight of the copolyamide, and solve the problem of the long preparation time for the preparation of the current high molecular weight copolyamide 6-mn , the product quality is unstable, the production efficiency is low, the energy consumption is large, and the reuse of the extracted water concentrate leads to the problem of low molecular weight of the product

Method used

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  • Method for improving molecular weight of copolyamide and product thereof
  • Method for improving molecular weight of copolyamide and product thereof
  • Method for improving molecular weight of copolyamide and product thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0055] In this embodiment, the following method is used to prepare copolyamide 6-612:

[0056] a. Add 560kg caprolactam, 45.5kg nylon 612 saline solution (concentration is 66wt.%), 0.06mol% disodium hydrogen phosphate (with respect to the total substance amount of caprolactam and nylon 612 salt) in the mixed liquid tank every hour, stir , to obtain a mixture.

[0057] 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 268°C, and the residence time is 3h.

[0058] c. Send the prepolymer in the prepolymerization reactor to the first amide exchanger, the temperature of the first amide exchanger is 276° C., the residence time is 1.5 h, and the pressure drops from 20 barg to 5 barg.

[0059] d. Send the material of the first amide exchanger to the first post-reactor, the temperature of the first post-reactor is 265°C, the reaction pre...

Embodiment 8

[0066] In this example, fresh caprolactam was used to prepare copolyamide 6-612:

[0067] a. Add 560kg fresh molten caprolactam, 45.5kg nylon 612 salt solution (concentration is 66wt.%), 0.06mol% disodium hydrogen phosphate (relative to the total substance amount of caprolactam and nylon 612 salt) into the mixed liquid tank per hour , stirred to obtain a mixture.

[0068] b. The mixture was mixed in a pipeline mixer, and then entered into a prepolymerization reactor for polymerization to form a prepolymer. The pressure of the prepolymerization reactor was 15 barg, the temperature was 265° C., and the residence time was 3 hours.

[0069] c. Send the prepolymer in the prepolymerization reactor to the first amide exchanger, the temperature of the first amide exchanger is 266° C., the residence time is 1.5 h, and the pressure drops from 15 barg to 5 barg.

[0070] d. Send the material of the first amide exchanger to the first post-reactor, the temperature of the first post-reacto...

Embodiment 9

[0073] In the present embodiment, copolyamide 6-610 is prepared by the following method:

[0074] a. Add 380kg caprolactam, 229kg nylon 610 salt solution (concentration is 65wt.%), 0.05mol% 2 (2,-pyridyl) ethylphosphonic acid (relative to the total molar weight of caprolactam and nylon 610 salt) per hour To the mixing tank, stir to get the mixture.

[0075] 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 265°C, and the residence time is 3h.

[0076] c. Send the prepolymer in the prepolymerization reactor to the first amide exchanger, the temperature of the first amide exchanger is 266° C., the residence time is 1.5 h, and the pressure drops from 20 barg to 5 barg.

[0077] d. Send the material of the first amide exchanger to the first post-reactor, the temperature of the first post-reactor is 265°C, the reaction pressure is 5 ...

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Abstract

The invention discloses a method for improving the molecular weight of copolyamide. According to the method, at least caprolactam and nylon mn salt are used as raw materials to prepare copolyamide 6-mn through a continuous process, and a catalyst is added in any link of mixing and amide exchange reaction in a polymerization stage in the preparation process of the copolyamide; the polymerization stage comprises a pre-polymerization reaction and at least one section of amide exchange reaction which are carried out in sequence, and melt generated by any section of amide exchange reaction can be subjected to pelletizing, extraction and drying to prepare a copolyamide slice finished product. 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, uniform in molecular weight distribution and excellent in performance.

Description

technical field [0001] The invention belongs to the technical field of polyamides, and in particular relates to a method for increasing the molecular weight of copolyamides and its products. 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...

Claims

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Application Information

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IPC IPC(8): C08G69/36C08G69/04
CPCC08G69/36C08G69/04
Inventor 于春晓姜锋李鑫胡志宇罗欣何洋洋赵亮
Owner CHINESE TEXTILE ACAD
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