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Continuous nylon polymerization process

A polymerization process and nylon technology, applied in the field of engineering plastics, can solve the problems of low efficiency and high energy consumption of nylon salt process, and achieve the effects of cost reduction, outstanding heat dissipation efficiency, good sealing performance and pressure resistance performance.

Active Publication Date: 2020-12-11
CHENGDU 401 TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] Aiming at the technical problems of high energy consumption and low efficiency of the existing nylon salt process, the present invention provides a continuous nylon polymerization process, that is, a certain amount of polyamide resin is added to the raw material system as a dispersion medium, so that each component can be uniformly and stably disperse into the system, and then complete the mixing of raw materials in the screw extrusion device. Taking advantage of the advantages of high heat dissipation and mixing efficiency of the screw extrusion device, it can solve the bottleneck of melt polymerization production efficiency and realize the complete continuous production process. It is an efficient, green and environmentally friendly nylon polymerization process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] A continuous nylon polymerization process, the polymerization raw materials, by mass, include 60 parts of dibasic acids for polymerization monomers, 40 parts of diamines and 10 parts of reactive dispersion medium polyamides; the raw materials are continuously measured by weight or volume It is fed into the screw extrusion device to make the polymerized monomer react and mix uniformly in the molten dispersion medium, and then enter the subsequent polymerization device to continue polymerization until the nylon resin reaches the required molecular weight.

[0056] The reactive dispersion medium polyamide is added from the front end of the screw extrusion device before the material is melted.

Embodiment 2

[0058] A continuous nylon polymerization process, the polymerization raw materials, by mass, include 20 parts of dibasic acids for polymerization monomers, 50 parts of diamines and 90 parts of reactive dispersion medium polyamides; the raw materials are continuously measured by weight or volume It is fed into the screw extrusion device to make the polymerized monomer react and mix uniformly in the molten dispersion medium, and then enter the subsequent polymerization device to continue polymerization until the nylon resin reaches the required molecular weight.

[0059] Put the dibasic acid and polyamide into the screw extrusion device first, disperse the dibasic acid into the molten polyamide, react to form a mixture of degraded polyamide and dibasic acid, and then add the dibasic amine into the screw extrusion device.

[0060] The follow-up polymerization device is a screw extrusion device, and the follow-up screw extrusion device is divided into a polymerization section for ...

Embodiment 3

[0062] A continuous nylon polymerization process, the polymerization raw materials are calculated by mass, including 10 parts of polymeric monomer dibasic acid and dibasic acid ester, 3 parts of diamine and 12 parts of reactive dispersion medium polyamide; measured by weight or volume The raw materials are continuously added to the screw extrusion device by metering, so that the polymerized monomers are reacted and mixed evenly in the molten dispersion medium, and then enter the subsequent polymerization device to continue polymerization until the nylon resin reaches the required molecular weight.

[0063] Put the dibasic acid and polyamide into the screw extrusion device first, disperse the dibasic acid into the molten polyamide, react to form a mixture of degraded polyamide and dibasic acid, and then add the dibasic amine into the screw extrusion device.

[0064] After the raw materials are continuously fed into the screw extruder, they are successively extruded and granulat...

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Abstract

The invention provides a continuous nylon polymerization process, which comprises the following polymerization raw materials in parts by mass: 5-60 parts of polymerization monomer dibasic acid and / ordibasic acid ester, 3-50 parts of diamine and 10-90 parts of reactive dispersion medium polyamide. According to the process, the raw materials are continuously added into a screw extrusion device in aweight metering or volume metering mode, so that the polymerization monomers react in the molten dispersion medium and are uniformly mixed; and then the mixture enters a subsequent polymerization device to be continuously polymerized until the nylon resin reaches the required molecular weight. According to the invention, melting reaction mixing of the raw materials is completed in the screw extrusion device, the bottleneck of melt polymerization production efficiency can be solved by utilizing the advantages of high heat dissipation and mixing efficiency of the screw extrusion device, and thenylon polymerization process is efficient, green and environmentally friendly.

Description

technical field [0001] The invention relates to the technical field of engineering plastics, in particular to a continuous nylon polymerization process. Background technique [0002] Nylon has comprehensive advantages in terms of mechanical properties, durability, corrosion resistance, heat resistance and cost, and is widely used in various fields such as electronics, machinery, fiber, and automobiles. Due to the pursuit of lightweight and environmental protection in various industries, replacing steel and wood with plastic has become a major trend in design and material selection. Nylon is one of the fastest growing parts of the plastics industry today, and the improvement of its production process has always been a research hotspot. [0003] At present, the most commonly used nylon polymerization process includes nylon salt process and melt polymerization process. The nylon salt process generally first prepares nylon salt in water or a strong polar organic solvent, and t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G69/28C08G69/26
CPCC08G69/28C08G69/26Y02W30/62
Inventor 李洋
Owner CHENGDU 401 TECH CO LTD
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