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Polyester-polyamide copolymer and synthetic preparation method thereof

A technology of polyamide copolymer and polyamide, which is applied in dyeing, textiles and papermaking, can solve the problems of poor compatibility between nylon and polyester, achieve uniform dyeing, increase tensile elongation at break, and improve the existing effect of technology

Active Publication Date: 2012-06-27
CHINESE TEXTILE ACAD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The first object of the present invention is to provide a kind of polyester-polyamide copolymer, this polyester-polyamide copolymer adopts nylon 6 that relative viscosity is very low and various polyesters carry out copolymerization reaction and make the copolymer of high molecular weight, The prepared polyester-polyamide copolymer not only has affinity for acid dyes, solves the problem of poor compatibility between nylon and polyester, but also has high tensile strength, high elongation at break, and more uniform sequence distribution, etc. Advantages, can be used to improve the strength of fibers prepared from modified polyester, dyeing uniformity, etc.

Method used

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  • Polyester-polyamide copolymer and synthetic preparation method thereof
  • Polyester-polyamide copolymer and synthetic preparation method thereof
  • Polyester-polyamide copolymer and synthetic preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0083] Mix 800g of dimethyl terephthalate (DMT) with 521g of ethylene glycol, 30g of propylene glycol, and 0.27g of tetrabutyl titanate evenly, then add it to the reaction kettle, raise the temperature to 200°C, and carry out the reaction for 60 minutes. 99% of the amount, the end of the transesterification reaction. Then add 0.43g of tetrabutyl titanate polycondensation catalyst, after heating up to 230°C, add 115g of nylon 6 intermediate polymer with a relative viscosity of 2.0, then heat up to 240°C, vacuumize to 50Pa, continue to heat up to 260°C, and the reaction proceeds for 4 hours, when the intrinsic viscosity of the polyester in the kettle is 0.82dL / g, the material is discharged to prepare a polyester-polyamide chip with a melting point of 220-252°C, which contains a mass of polyamide 12%.

Embodiment 2

[0085] Mix 800g of dimethyl terephthalate (DMT) with 521g of ethylene glycol, 35g of butanediol, and 0.22g of tetrabutyl titanate evenly, then add them to the reaction kettle, raise the temperature to 160°C, and carry out the reaction for 60 minutes. When reaching 98% of the theoretical amount, the transesterification reaction was terminated. Then add 0.4g tetrabutyl titanate polycondensation catalyst, heat up to 230°C, then add 68g of nylon 6 intermediate with a relative viscosity of 1.8, then heat up to 245°C, vacuumize to 50Pa, continue to heat up to 260°C, and the reaction proceeds for 5 hours, when the intrinsic viscosity of the polyester in the kettle is 0.85dL / g, the material is discharged to prepare a polyester-polyamide chip with a melting point of 210-220°C, which contains a mass of polyamide 5%.

Embodiment 3

[0087] 1) transesterification reaction

[0088] Add 800g of dimethyl terephthalate and 521g of ethylene glycol, 15g of propylene glycol and 25g of butanediol into the reaction kettle, then add 0.12g of tetrabutyl titanate as a catalyst to carry out transesterification reaction at 220°C, the reaction time For 40 minutes, when the fraction reaches 98% of the theoretical amount, the transesterification reaction is terminated to obtain the transesterification reaction product;

[0089] 2) Copolymerization reaction

[0090] Add 0.25g of tetrabutyl titanate polycondensation catalyst to the transesterification reaction product obtained in step 1), then raise the temperature to 230°C, add 63.4g of nylon 6 polymer with a relative viscosity of 1.5 for copolymerization reaction, when the temperature reaches 240°C , pump a high vacuum, keep the vacuum at 30Pa, continue to heat up to 255°C, and react for 5 hours. When the intrinsic viscosity reaches 0.85dL / g, the material is discharged to...

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Abstract

The invention relates to a polyester-polyamide copolymer and a synthetic preparation method thereof. The polyester-polyamide copolymer is composed of polyester and nylon 6 with relative viscosity of 1.5-2.2, intrinsic viscosity thereof is 0.80-0.90dL / g, tensile strength thereof is 40-80MPa, elongation at break thereof is 10-80%, content of a terminal carboxyl group thereof is less than 18mol / t and diglycol content thereof is less than 1.0%. In the invention, the nylon 6 with the relative viscosity of 1.5-2.2 is added during the polyester polymerization process, so that a polyester prepolymer performs copolymerization with the nylon 6 to obtain a polyester copolymer with an acid dyeable amide group which has affinity to acid dyes, thus further processing and preparing polyester chips and fibers, which can be subject to acid dyeing; and the method thoroughly solves the problem of poor compatibility between the nylon and the polyester, and overcomes the problems of low spinning strength,poor dyeing uniformity and easy occurrence of color difference of the copolymer obtained in the prior art.

Description

technical field [0001] The invention relates to a polyester-polyamide copolymer and a synthesis preparation method thereof. Background technique [0002] In recent years, my country's chemical fiber production has developed rapidly, and its production capacity has accounted for 1 / 3 of the world's chemical fiber production, of which polyester production accounts for 1 / 2 of the world's production, ranking first in the world, and the production capacity is still developing at a high speed. The center of polyester polyester development. Wherein polyester staple fiber has been used more and more for blending with wool etc. since it appeared on the market, for preparing wool polyester worsted fabrics. With the increase of polyester staple fiber in the preparation of fine-woven fabrics such as wool and polyester, the amount of this aspect accounts for about 40% of the total output of polyester staple fiber. Therefore, it is of great practical significance to research and develop t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G69/44D06P3/24
Inventor 刘伯林黄庆赵庆章潘菊芳吴鹏飞廉志军金剑李鑫白瑛
Owner CHINESE TEXTILE ACAD
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