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Method for continuously producing lactam copolymer

A technology of lactam and copolymer, which is applied in the field of continuous production of lactam copolymer, can solve problems such as weak crystallization ability, thermal performance, deterioration of solvent resistance, poor molecular structure regularity, etc., to improve stability and reduce production energy consumption , Improve the effect of production flexibility

Active Publication Date: 2020-04-28
CHINESE TEXTILE ACAD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing technology mainly uses lactam, diamine and dicarboxylic acid salts to continuously prepare copolyamides, which has poor molecular structure regularity and weak crystallization ability, which leads to deterioration of its thermal performance and solvent resistance, which makes the application range of copolyamides restricted. limit

Method used

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  • Method for continuously producing lactam copolymer
  • Method for continuously producing lactam copolymer
  • Method for continuously producing lactam copolymer

Examples

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Embodiment 1

[0052] A1. After mixing the caprolactam melt and water evenly, enter the prepolymerization reactor for hydrolysis and ring-opening reaction. The amount of water added is 1.5wt% of the mass of caprolactam. The reaction temperature of the hydrolysis ring-opening reaction is 250°C and the reaction pressure is 2bar , The reaction time is 2h, obtains caprolactam oligomer;

[0053] A2. The caprolactam oligomer prepared in step A1 and polyhexamethylene adipamide, the condensation polymer of adipic acid and hexamethylenediamine added online, are mixed evenly by a 3-stage high-shear homogenizing pump, and then enter the exchange reactor for exchange. Reaction, wherein the relative viscosity of polyhexamethylene adipamide is 2.0, the addition amount is 15wt% of the caprolactam oligomer, the aspect ratio of the exchange reactor is 10, the exchange reaction temperature is 270 ° C, the reaction pressure is 2bar, the reaction Time is 30min, obtains the oligomer melt of lactam copolymer;

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Abstract

A method for continuously producing the lactam copolymer comprises the following steps: A1, uniformly mixing a lactam melt with water, and then feeding the mixture into a pre-polymerization reactor for hydrolysis ring-opening reaction to obtain a lactam oligomer; A2, uniformly mixing the lactam oligomer prepared in the step A1 with a condensation polymer of binary acid and diamine which are addedon line, and then enabling the mixture to enter an exchange reactor for exchange reaction to obtain an oligomer melt of a lactam copolymer; A3, enabling the oligomer melt prepared in the step A2 to enter a pre-polymerization reactor for addition polymerization, so as to obtain the prepolymer melt of the lactam copolymer; A4, removing residual moisture from the prepolymer melt prepared in the stepA3 through a melt dryer, and then enabling the prepolymer melt to enter a post-polymerization reactor for polycondensation reaction, so as to obtain a lactam copolymer melt; and A5, sequentially granulating, extracting and drying the lactam copolymer melt prepared in the step A4 to obtain lactam copolymer slices. The regularity of the molecular structure of the produced copolymer can be improved.

Description

technical field [0001] The present invention relates to a method for producing a lactam copolymer, in particular, to a method for continuously producing a lactam copolymer. Background technique [0002] Polyamide has good mechanical properties, wear resistance, chemical resistance, flame retardancy and self-lubrication, and is easy to process and has a low coefficient of friction. It has been widely used in automobiles, textiles, instruments, machinery, food packaging, and consumer goods It has become one of the most important chemical synthetic materials in the world. After years of rapid development, the global polyamide industry has achieved significant growth, but there are also prominent problems of structural excess caused by excessive product homogeneity, which has seriously affected the sustainable development of the polyamide industry. Adjusting product structure, developing new products and new technologies, and developing differentiated products to meet the multi...

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 邱志成李鑫曲希明姜峰赵亮
Owner CHINESE TEXTILE ACAD
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