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Method for regenerating nylon

A technology of nylon and depolymerization catalyst, which is applied in the field of recycled nylon, can solve the problems of high cost, complex process, and high requirements, and achieve the effects of high nylon recovery rate, easy industrialization, and simple process

Inactive Publication Date: 2014-09-03
李兆顺 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the disadvantages of the existing nylon regeneration method, such as high environmental pollution, complex process, high requirements, poor quality and high cost of the recycled nylon material, and propose a nylon with high recovery rate and high cost. Method for regenerated nylon with material properties close to those of new nylon materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] This example is used to illustrate the method of using the method of the present invention to regenerate nylon from nylon tire cord.

[0041]Clean up the nylon tire cord purchased from Zouping, Shandong, and try to remove non-nylon impurities. Take 500 grams of cleaned nylon tire cord and add it to a 5-liter high-pressure reactor, and then add 1.5 kilograms of industrial alcohol (volume fraction: 96%) and 14.6 grams of adipic acid to the reactor. Heat to 150°C, fill with nitrogen to maintain the pressure at 3.0Mpa, and react for 50min under stirring. The powdered nylon 66 oligomer material is obtained after the temperature and pressure are lowered to normal temperature and pressure. The above materials were dissolved in hot water at 90°C, and the insoluble matter was filtered out with a sieve. The weight of the insoluble matter was 199.6 g after dehydration and drying; the nylon component was basically not detected in the insoluble matter through reflection spectrum an...

Embodiment 2

[0045] Except that the industrial alcohol solvent used in Example 1 is changed into 1 kilogram of methyl alcohol and 0.5 kilogram of propanol, other operating methods are the same as Example 1.

[0046] As a result, 294 grams of nylon 66 particles were obtained, and the recovery rate of nylon was 98%.

[0047] The performance of the regenerated nylon 66 material obtained by testing has a tensile strength of 74Mpa, a melting point of 255°C, and a Rockwell hardness of 121, which basically meet the parameter standards of new nylon 66 materials.

[0048]

Embodiment 3

[0050] This example is used to illustrate the method of using the method of the present invention to regenerate nylon from nylon carpet.

[0051] The recovered nylon carpet material containing nylon 6 is cleaned to remove non-nylon impurities as much as possible. Take 1 kg of cleaned nylon carpet material and put it into the autoclave, then add 2 kg of industrial alcohol (volume fraction: 96%), 10 g of sodium phosphite, 10 g of N,N dimethylformamide and 2 grams of caprolactam. Heat to 150°C, fill with nitrogen to maintain the pressure at 3.0Mpa, react under stirring for 20min, and the stirring torque is obviously reduced. After lowering the temperature and pressure to normal temperature and pressure, the material was taken out, filtered through a 60-mesh sieve to remove the massive sticky substance, and a white and clean powder material was obtained; the weight of the blocky sticky substance was dehydrated and dried to be 403 grams; it was analyzed by reflection spectrum , b...

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Abstract

The invention provides a method for regenerating nylon. The method comprises the following steps: firstly, treating a material containing the nylon in the presence of a solvent and a depolymerization catalyst at a temperature of 10 DEG C to 200 DEG C at a pressure of 0.4MPa to 4MPa so as to obtain a nylon oligomer; then, removing impurities from the obtained nylon oligomer; and finally, regulating a pH value of the treated nylon oligomer by using a diamine material so as to stabilize the pH value within 7.5 to 8, adding a polymerization catalyst, heating to 100 DEG C to 300 DEG C in a stirring manner and pressurizing to 0.4MPa to 3MPa until the melt index of the material reaches 30g to 60g per 10 minutes, thereby obtaining the regenerated nylon material. The method provided by the invention is simple in process, low in cost, easy to industrialize and high in nylon recycling rate. In addition, the performance of the obtained nylon material is approximate to that of a novel nylon material.

Description

technical field [0001] A method of regenerating nylon. Background technique [0002] With the advancement of science and technology and the needs of social development, nylon materials as engineering plastics are more and more widely used in human production and life, such as household appliances, automobiles, clothing, electronics, fishing gear, sports equipment, weapon industry, aviation, etc. Aerospace and other fields, and thus produced a large amount of waste nylon products. At present, the treatment of waste nylon products includes incineration, pyrolysis, acid hydrolysis and direct recycling. [0003] The United States and Japan use high-temperature cracking technology to crack waste nylon cord in a furnace at 390 ° C or high-temperature steam to obtain raw materials for synthesizing nylon such as caprolactam and hexamethylenediamine. However, the disadvantage of using this method is that the cracking process will produce a large amount of low-molecular pollutants, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G69/28C08G69/16C08J11/24C08J11/20C08L77/02
CPCY02W30/62
Inventor 李兆顺
Owner 李兆顺
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