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A kind of method of waste polyamide 6 alcoholysis regeneration

A polyamide and alcoholysis technology, applied in the field of alcoholysis regeneration of waste polyamide 6, can solve the problems of loss of reactivity, easy to destroy the balance of moles of molecular chain end groups, molecular structure damage, etc., to achieve simple process and ensure mechanical properties. and physicochemical properties, the effect of preserving integrity

Active Publication Date: 2022-05-06
DONGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, because aminocaproic acid, the molecular unit of polyamide 6, has a unique characteristic of heteroend groups, it is very easy to destroy the molar balance of the end groups of the molecular chain during the recycling process, thereby losing reactivity, so it is difficult to achieve effective recycling through chemical methods
CN200580016951.7 discloses a technology for regenerating polyester polyamide fibers by mixing chemical methods, mainly relying on the alcoholysis of the polyester part to provide reactive groups and then realize the preparation of secondary copolyamides, but the prepared copolyamides Compared with polyester polyamide, the molecular structure has a greater degree of damage, and the performance of recycled materials cannot be well guaranteed

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  • A kind of method of waste polyamide 6 alcoholysis regeneration

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Embodiment 1

[0033] A method for alcoholysis regeneration of waste polyamide 6, the specific form of waste polyamide 6 is curtains; the specific steps of alcoholysis regeneration of waste polyamide 6 are as follows:

[0034] (1) Add a certain amount of sodium acetate, HOOC (CH 2 ) 2 CH 2 OH and phosphoric acid, carry out the alcoholysis reaction for 8 hours under the conditions of temperature 230°C and pressure 1.5MPa, and generate alcoholysis polyamide 6 segment with carboxyl group and amino group at both ends and number average molecular weight of 1000g / mol;

[0035] HOOC (CH 2 ) 2 CH 2 The amount of OH added is 60wt% of waste polyamide 6;

[0036] The amount of phosphoric acid added is 10ppm of waste polyamide 6;

[0037] The addition of sodium acetate is 10ppm of waste polyamide 6;

[0038] (2) Esterification and amidation were carried out at a temperature of 220° C. and nitrogen purging to prepare regenerated polyamide 6, and the termination condition was that the molecular wei...

Embodiment 2

[0044] A method for alcoholysis regeneration of waste polyamide 6, the specific form of waste polyamide 6 is carpet; the specific steps of alcoholysis regeneration of waste polyamide 6 are as follows:

[0045] (1) Add a certain amount of sodium acetate, p-hydroxybenzoic acid and sulfuric acid to the waste polyamide 6, and carry out the alcoholysis reaction at a temperature of 235 ° C and a pressure of 1.2 MPa for 8 hours to form carboxyl and amino groups at both ends. The number average molecular weight is the alcoholyzed polyamide 6 segment of 1500g / mol;

[0046] The addition of p-hydroxybenzoic acid is 50wt% of waste polyamide 6;

[0047] The addition of sulfuric acid is 50ppm of waste polyamide 6;

[0048] The addition of sodium acetate is 100ppm of waste polyamide 6;

[0049] (2) Esterification and amidation were carried out at a temperature of 230° C. and nitrogen purging to prepare regenerated polyamide 6, and the termination condition was that the molecular weight of ...

Embodiment 3

[0055] A method for alcoholysis regeneration of waste polyamide 6, the specific form of waste polyamide 6 is a fishing net line; the specific steps of alcoholysis regeneration of waste polyamide 6 are as follows:

[0056] (1) Add a certain amount of sodium acetate, and hydrochloric acid, at a temperature of 240° C. and a pressure of 1 MPa, carry out an alcoholysis reaction for 7 hours to generate an alcoholysis polyamide 6 segment with a number average molecular weight of 2500 g / mol having carboxyl groups and amino groups at both ends;

[0057] The amount of addition is 40wt% of waste polyamide 6;

[0058] The addition amount of hydrochloric acid is 100ppm of waste polyamide 6;

[0059] The addition of sodium acetate is 50ppm of waste polyamide 6;

[0060] (2) Esterification and amidation were carried out at a temperature of 240° C. and nitrogen purging to prepare regenerated polyamide 6, and the termination condition was that the molecular weight of the regenerated polya...

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Abstract

The invention relates to a method for alcoholysis regeneration of waste polyamide 6. First, waste polyamide 6 is added into alkyd monomer under certain temperature and pressure conditions to carry out alcoholysis to generate alcoholysis polyamide 6 with carboxyl and amino groups at both ends. segment, and then the segment is esterified and amidated under certain conditions to prepare regenerated polyamide 6, and the regenerated polyamide 6 fiber is prepared by melt spinning. The present invention integrates the method principle of polyester alcoholysis and repolymerization into the resource regeneration application of polyamide 6. By this method, waste polyamide 6 can be recycled and reused, and alcohol can be controlled by adjusting the amount of alkyd molecules added. The number-average molecular weight of the polyamide 6 segment after solution is determined, so that the regularity of the segment can be maintained. The proposal of the method of the present invention provides a new method for resource reuse of waste polyamide 6, and can be widely used in the fields of plastics and fibers.

Description

technical field [0001] The invention belongs to the technical field of polyamide 6 waste recycling, and relates to a method for alcoholysis and regeneration of waste polyamide 6. Background technique [0002] Due to its excellent physical and mechanical properties and textile processing properties, polyamide 6 has ranked first in the synthetic fiber family in terms of output for a long period of time since its inception, and is also widely used in the field of plastics. In 2017, my country's polyamide 6 output has exceeded 3 million tons, a year-on-year increase of nearly 10%. Polyamide 6 has excellent physical properties unmatched by polyester, such as high breaking strength, good wear resistance, good hygroscopicity, excellent elastic recovery rate and fatigue resistance, and good dyeability. In addition to being used in the clothing industry and decoration, polyamide 6 also has broad application scenarios in other industries such as tire cord fabrics, automotive textiles...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G69/14C08G69/16D01F6/60C08J11/26C08L77/02
CPCC08G69/14C08G69/16D01F6/60C08J11/26C08J2377/02Y02W30/62
Inventor 王朝生张圣明吉鹏王华平吴宇豪沈午枫任悦
Owner DONGHUA UNIV