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A kind of bio-based degradable polyamide 6 copolymer and preparation method thereof

A bio-based, polyamide technology, applied in melt spinning, single-component synthetic polymer rayon, textiles and papermaking, etc., can solve problems such as uneven distribution of fiber strength, inability to crystallize copolymers, and broken filaments

Active Publication Date: 2020-04-17
JIANGSU NEW HORIZON ADVANCED FUNCTIONAL FIBER INNOVATION CENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, it will affect the regularity of the molecular segment, so that the copolymer cannot be crystallized. During the spinning process, the copolymer will have a tough segment (crystalline region) and a brittle segment (amorphous region). The tough segment has strength, and the brittle segment has no Intensity, in the process of winding and post-drawing, the stress concentration of the brittle section will cause broken filaments, which cannot be formed into fibers, even if the fiber strength distribution is uneven after fiber formation, the fiber strength will be low
Therefore, it needs to be subjected to hydrothermal extraction to remove impurities, and the ether bond and ester bond in the molecular chain undergo certain hydrothermal degradation during the hydrothermal extraction process, which will affect the stability of the product

Method used

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  • A kind of bio-based degradable polyamide 6 copolymer and preparation method thereof
  • A kind of bio-based degradable polyamide 6 copolymer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] A preparation method of bio-based degradable polyamide 6 copolymer, the specific steps are as follows:

[0070] (1) At a temperature of 75°C, polyamide 66 salt and NH 2 (CH 2 ) 4 A mixture of COOH (mass ratio 1:1), caprolactam, HOOC (CH 2 ) 2 COOH and deionized water were mixed with mechanical stirring to obtain a mixture, HOOC(CH 2 ) 2 The amount of COOH added is 11wt% of the added amount of caprolactam, the amount of deionized water added is 2wt% of the added amount of caprolactam, polyamide 66 salt and NH 2 (CH 2 ) 4 The addition amount of the mixture of COOH is 0.2wt% of the addition amount of caprolactam, the rotating speed of mechanical stirring is 80r / min, and the time is 10min;

[0071] (2) Prepolymerize the mixture to obtain a dibasic acid-terminated polyamide 6 prepolymer. The temperature of the prepolymerization is 220° C., the pressure is 0.5 MPa, the atmosphere is nitrogen, and the termination condition is polyamide 6 prepolymer. The number average...

Embodiment 2

[0078] A preparation method of bio-based degradable polyamide 6 copolymer, the specific steps are as follows:

[0079] (1) At a temperature of 100°C, mix polyamide 66 salt with NH 2 (CH 2 ) 6 A mixture of COOH (mass ratio 1:1), caprolactam, HOOC (CH 2 ) 3 COOH and deionized water were mixed with mechanical stirring to obtain a mixture, HOOC(CH 2 ) 3 The amount of COOH added is 17wt% of the added amount of caprolactam, the amount of deionized water added is 2.5wt% of the added amount of caprolactam, polyamide 66 salt and NH 2 (CH 2 ) 6 The addition amount of the mixture of COOH is 0.8wt% of the addition amount of caprolactam, the rotating speed of mechanical stirring is 150r / min, and the time is 30min;

[0080] (2) Prepolymerize the mixture to obtain a dibasic acid-terminated polyamide 6 prepolymer. The temperature of the prepolymerization is 280° C., the pressure is 1.3 MPa, the atmosphere is nitrogen, and the termination condition is polyamide 6 prepolymer. The numbe...

Embodiment 3

[0087] A preparation method of bio-based degradable polyamide 6 copolymer, the specific steps are as follows:

[0088] (1) At a temperature of 85°C, caprolactam, HOOC (CH 2 ) 5 COOH, deionized water and polyamide 66 salt were mixed with mechanical stirring to obtain a mixture, HOOC(CH 2 ) 5 The addition amount of COOH, deionized water and polyamide 66 salt is 5wt%, 4.5wt% and 0.2wt% of the added amount of caprolactam, respectively, the speed of mechanical stirring is 100r / min, and the time is 60min;

[0089] (2) Prepolymerize the mixture to obtain a dibasic acid-terminated polyamide 6 prepolymer. The temperature of the prepolymerization is 240° C., the pressure is 2 MPa, the atmosphere is nitrogen, and the termination condition is polyamide 6 prepolymerization The number average molecular weight of the body is 2000, and the terminal amino group content is 0.8mmol / kg;

[0090] (3) The mixture of bio-based propylene glycol and bio-based pentanediol (mass ratio is 1:1), polya...

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Abstract

The invention relates to a biology-base degradable polyamide 6 copolymer and a preparation method thereof. The method comprises the following steps: firstly synthesizing a binary acid terminated polyamide 6 prepolymer, and adding biology-base dihydric alcohol to react with a carboxyl of an end group, preparing a polyamide 6 prepolymer esterified substance, finally enabling the polyamide 6 prepolymer esterified substance to be mixed with biology-base polyester, performing an ester exchange reaction to prepare the biology-base degradable polyamide 6 copolymer. A molecular chain of the prepared biology-base degradable polyamide 6 copolymer is mainly formed by a biology-base dihydric alcohol chain segment, a polyamide 6 prepolymer chain segment and a biology-base polyester chain segment. The method is capable of, through a copolymerization method, enabling the biology-base dihydric alcohol and biology-base polyester chain segments to be uniformly dispersed in the polyamide 6 prepolymer, and increasing degradation uniformity of the copolymer and high efficiency of a degradation rate. The prepared polyamide 6 copolymer is high in fusion point, and low in hot water extractable matter content, and can be directly used for spinning. Prepared fibers are good in strength, and easy to degrade. The method is capable of realizing large-scale production, and good in application prospect.

Description

technical field [0001] The invention belongs to the technical field of polymer copolymer preparation, and relates to a bio-based degradable polyamide 6 copolymer and a preparation method thereof. Background technique [0002] Materials prepared from polyamide polymers have excellent properties. For example, polyamide fibers have the advantages of high breaking strength, good wear resistance, good hygroscopicity, good dyeability, elastic recovery rate and excellent fatigue resistance. There are many varieties of polyamide fibers, the main varieties are polyamide 6 fibers and polyamide 66 fibers, which can be used to prepare tire cord fabrics, automotive textiles and filter materials, etc., and have a wide range of applications. [0003] However, the waste of a large number of polyamide polymer materials has also brought serious environmental pollution problems. Therefore, the degradability of polyamide polymer materials has also received more and more attention. Biodegradabl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G69/44D01F6/82D01D5/08
Inventor 王朝生张圣明王华平吉鹏范学松王凯朱宝胜
Owner JIANGSU NEW HORIZON ADVANCED FUNCTIONAL FIBER INNOVATION CENT CO LTD
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