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Continuous polymerization production method of polyamide

A production method and technology of polyamide, applied in the field of continuous polymerization of polyamide, can solve the problems of complex process equipment, long process, high cost, etc., achieve the effects of environmental friendliness, saving production cost, and increasing release capacity

Pending Publication Date: 2021-09-24
祁春玉
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] For the above three methods (1), (2), and (3), the polymerization process adopts a 5-step or 6-step method for polymerization production, so there are disadvantages of complex process equipment, long process, and high cost; and For the above (4), although its flow process is relatively short, this method has the defects of low viscosity, many waste materials and unstable product quality

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A kind of continuous polymerization production method of polyamide

[0030] S0. Salt formation: Add 1200kg of desalted water into the salt formation reaction kettle, start stirring at a speed of 110r / min, then add 354.35kg of hexamethylenediamine; keep the temperature in the salt formation reaction kettle at 50°C through the salt formation heat exchanger , slowly drop in 445.65kg of adipic acid to synthesize a 40% nylon 66 salt solution.

[0031] S1. Feeding: Set up three prepolymerization reactors A / B / C that are opened and closed in sequence, and the salt liquid circulation pump pumps the nylon salt solution in the salt forming reactor into the salt preheater, so as to preheat the nylon salt solution to 90 ℃; After preheating, measure multiple 280kg nylon salt solutions (70% of the solution capacity of the prepolymerization reactor) through a flow meter, and add multiple nylon salt solutions to A / B / C in the order of A / B / C Three prepolymerization reactors.

[0032] S2...

Embodiment 2

[0038] A kind of continuous polymerization production method of polyamide

[0039] S0. Salt formation: Add 1000kg of desalted water into the salt formation reaction kettle, start stirring at a speed of 100r / min, then add 364.89kg of hexamethylenediamine; keep the temperature in the salt formation reaction kettle at 50°C through the salt formation heat exchanger , slowly drop into 635.11kg of sebacic acid to synthesize a 50% nylon 610 salt solution.

[0040] S1. Feeding: Set up three prepolymerization reactors A / B / C that are opened and closed in sequence, and the salt liquid circulation pump pumps the nylon salt solution in the salt forming reactor into the salt preheater, so as to preheat the nylon salt solution to 95 ℃; After preheating, measure multiple 240kg nylon salt solutions (60% of the solution capacity of the prepolymerization reactor) through a flow meter, and add multiple nylon salt solutions to A / B / C in the order of A / B / C Three prepolymerization reactors.

[0041...

Embodiment 3

[0047] A kind of continuous polymerization production method of polyamide

[0048] S0. Salt formation: Add 800kg of desalted water into the salt-forming reactor, start stirring at a speed of 110r / min, then add 493.78kg of pentamethylenediamine; keep the temperature in the salt-forming reactor at 55°C through the salt-forming heat exchanger , slowly drop into 706.22kg of adipic acid to synthesize a 60% nylon 56 salt solution.

[0049] S1. Feeding: Set up three prepolymerization reactors A / B / C that are opened and closed in sequence, and the salt liquid circulation pump pumps the nylon salt solution in the salt forming reactor into the salt preheater, so as to preheat the nylon salt solution to 96 ℃; After preheating, measure multiple 160kg nylon salt solutions (40% of the solution capacity of the prepolymerization reactor) through a flow meter, and add multiple nylon salt solutions to A / B / C in the order of A / B / C Three prepolymerization reactors.

[0050] S2. Pre-polymerization...

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PUM

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Abstract

The invention belongs to the technical field of polyamide production, and discloses a continuous polymerization production method of polyamide, which comprises the following steps of: S0, synthesizing a nylon salt solution by using diamine and binary acid as raw materials; S1, feeding: arranging a plurality of pre-polymerization reaction kettles which are sequentially opened and closed, and sequentially adding an equal amount of preheated nylon salt solution into the plurality of pre-polymerization reaction kettles according to a feeding opening sequence; S2, prepolymerization: heating the pre-polymerization reaction kettles to enable the nylon salt solution to generate pre-polymerization reaction in the kettles to obtain a pre-polymerization product; and S3, final polymerization: sequentially and continuously conveying the pre-polymerization product in the plurality of pre-polymerization reaction kettles into a final polymerization vacuum reaction kettle according to a discharging starting sequence, carrying out vacuum polycondensation at a preset liquid level, continuously discharging to obtain a final polymerization product, and granulating and forming the final polymerization product to obtain a polyamide slice finished product. In conclusion, the method provided by the invention only needs two steps, namely, pre-polymerization and final polymerization, so that the defects of complex process equipment, relatively long flow and relatively high cost of the existing continuous polymerization are effectively overcome.

Description

technical field [0001] The invention belongs to the technical field of polyamide production, and in particular relates to a continuous polymerization production method of polyamide. Background technique [0002] Polyamide, also known as nylon (PA), is an important class of engineering plastics and synthetic fiber raw materials. According to the different polymerization raw materials, it can be divided into two categories: one type of raw material is a component monomer containing both amino and carboxyl groups in the molecule, such as nylon 6 with caprolactam as raw material; the other type of raw material is dibasic acid and dibasic acid. Two-component nylon synthesized from amine monomers, the largest variety is nylon 66 made of adipic acid and hexamethylenediamine. [0003] Taking the above-mentioned nylon 66 as an example, the prior art mainly includes the following preparation methods: [0004] (1) China Liaoyang Petrochemical Co., Ltd. imported nylon 66 continuous po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G69/28
CPCC08G69/28
Inventor 祁春玉李沁芳李俊颉
Owner 祁春玉
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