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A kind of technological method for preparing nylon 12 with long-chain amino acid as monomer

A process method and amino acid technology, which is applied in the field of preparing long carbon chain nylon, can solve the problems of unsuitable polymerization conditions for 12-aminododecanoic acid, etc., and achieve the effects of low cost, easy operation of steps, and cost-free pollution

Active Publication Date: 2020-05-05
WUXI YINDA NYLON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The ready-made polymerization methods (nylon 6, nylon 66, nylon 610, nylon 612, etc.) all place the raw material monomers, their additives, and solvents in the polymerization kettle, and complete them in one step by controlling the temperature and pressure of the system. Not suitable for 12-aminododecanoic acid polymerization conditions

Method used

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  • A kind of technological method for preparing nylon 12 with long-chain amino acid as monomer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A process for preparing nylon 12 with long-chain amino acids as monomers, comprising the steps of:

[0023] (1) Initial polymerization: Add 3kg of aminododecanoic acid, 6kg of deionized water, 1g of sebacic acid, 1g of sodium hypophosphite and 1g of antioxidant 1098 into the prepolymerization reactor, and pass nitrogen for 5 minutes to eliminate the reaction The air in the kettle is then turned on to stir, heated to raise the temperature to 175°C, and the pressure to reach 0.9MPa, slowly discharge water vapor to keep the pressure at 0.9MPa, react for 4 hours, open the exhaust valve, and slowly reduce the pressure of the reaction kettle to 0.4MPa; then press the material in the prepolymerization kettle into the polymerization kettle.

[0024] (2) Polymerization: After the feeding is completed, start the stirring, start the automatic control program (PLC), heat the temperature to rise slowly to 240°C, automatically open the exhaust valve, and maintain a suitable dehydrati...

Embodiment 2

[0027] A process for preparing nylon 12 with long-chain amino acids as monomers, comprising the steps of:

[0028] (1) Initial polymerization: Add 3kg of aminododecanoic acid, 6kg of deionized water, 1g of sebacic acid, 1g of sodium hypophosphite, and 1g of antioxidant sunox508 into the prepolymerization reactor, pass nitrogen gas for 5 minutes, and remove the reactor Then turn on the stirring, heat to raise the temperature to 175°C, and the pressure to 0.9MPa, slowly discharge water vapor to keep the pressure at 0.9MPa, after 4 hours of reaction, open the exhaust valve, slowly reduce the pressure of the reactor to 0.4MPa.

[0029] Then the material in the pre-polymerization kettle is pressed into the polymerization kettle;

[0030] (2) Polymerization: After the feeding is completed, start the stirring, start the automatic control program (PLC), heat the temperature to rise slowly to 230°C, automatically open the exhaust valve, and maintain a suitable dehydration speed accord...

Embodiment 3

[0033] A process for preparing nylon 12 with long-chain amino acids as monomers, comprising the steps of:

[0034](1) Initial polymerization: Add 3kg of aminododecanoic acid, 6kg of deionized water, 1g of sebacic acid, 1g of sodium hypophosphite and 1g of antioxidant 1098 into the prepolymerization reactor, and pass nitrogen for 5 minutes to eliminate the reaction Then turn on the stirring, heat the temperature to 175°C, and the pressure reaches 0.9MPa, slowly discharge water vapor to keep the pressure at 0.9MPa, after 4 hours of reaction, open the exhaust valve, and slowly drain the reactor The pressure drops to 0.4MPa. Then the material in the pre-polymerization kettle is pressed into the polymerization kettle;

[0035] (2) Polymerization: After the feeding is completed, start the stirring, start the automatic control program (PLC), heat the temperature slowly to 240°C, automatically open the exhaust valve, and maintain a suitable dehydration speed according to the changing...

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Abstract

The invention relates to a process method for preparing nylon12 by taking long-chain amino acid as a monomer. The process method comprises the following steps: first, putting 12-aminododecanoic acid and water serving as raw materials into a reaction kettle according to a mass ratio of 1 to (1 to 4); second, adding 0.01 to 1 percent of catalyst, 0.05 to 0.5 percent of antioxidant, 0.08 to 5 percent of molecular weight conditioning agent into the reaction kettle based on the mass of the raw materials in sequence to perform initial polymerization, and performing polymerization in a polymerization kettle; finally, increasing the viscosity in a co-rotating twin-screw extruder to prepare the nylon12 product. The preparation method is simple, and is easy to operate; the prepared nylon12 resin is free from coking, nodes, narrow molecular weight normal distribution, consistent viscosity and wide application range.

Description

technical field [0001] The invention relates to a process for preparing long-chain nylon by using long-chain amino acid as a monomer, more specifically, a polymerization method for preparing nylon 12 by using 12-aminododecanoic acid as a raw material, and belongs to the technical field of polyamide engineering plastics. Background technique [0002] Nylon 12 is a long carbon chain polyamide with long methylene chain and low amide group density; it has low density, low melting point, good thermal stability and high decomposition temperature; low temperature resistance, oil resistance, corrosion resistance and friction resistance Excellent characteristics such as loss; widely used in automobile system pipelines, chemical petroleum pipelines, and hydraulic transmission systems. Nylon 12 has a low moisture absorption rate and can be used for precision-sized electrical parts and instruments; it has good gas barrier properties and is non-toxic and can be used for food and pharmace...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G69/08C08G69/04C08L77/02
CPCC08G69/04C08G69/08C08L77/02
Inventor 陈尚标沈俊毅胡瑞莉殷炼伟
Owner WUXI YINDA NYLON
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