High heat-resistant and high-strength polylactic acid fiber and preparation method thereof

A polylactic acid fiber, high-strength technology, applied in the field of polylactic acid fiber and its preparation, can solve the problems that the fabric cannot meet the high-temperature ironing and washing requirements of ordinary textiles, the PLA crystallization rate is slow, and the glass transition temperature is low. The effect of industrial scale production, reduced shrinkage in boiling water, and improved degree of orientation

Active Publication Date: 2015-12-30
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the very slow crystallization rate of PLA, it is difficult to complete the crystallization in the melt spinning process, so that the heat resistance of the obtained fiber is limited by its low glass transition temperature (55-60 °C), and the heat resistance temperature is usually only 50 °C. -55°C, the resulting fabric cannot meet the high-temperature ironing and washing requirements of ordinary textiles (AATCCRev., 2003, 3:56-61); at the same time, PLA fibers with low crystallinity are easily hydrolytically degraded under higher t

Method used

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  • High heat-resistant and high-strength polylactic acid fiber and preparation method thereof
  • High heat-resistant and high-strength polylactic acid fiber and preparation method thereof
  • High heat-resistant and high-strength polylactic acid fiber and preparation method thereof

Examples

Experimental program
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Effect test

Example Embodiment

[0026] Example 1

[0027] The weight average molecular weight is 1.41×10 4 g·mol, 98.6% optical purity of polylactic acid and tetramethylene-dibenzoyl hydrazide are premixed uniformly, and then the premix is ​​added to a twin-screw extruder and extruded and pelletized at 180°C to obtain Siya A masterbatch with a methyl-dibenzoyl hydrazide content of 2wt%; the obtained masterbatch and a weight average molecular weight of 1.41×10 5 g·mol, with an optical purity of 98.6%, polylactic acid is premixed uniformly according to the content of the organic small molecule nucleating agent in the fiber as 0.2wt%, and melted and mixed at 180℃, then granulated; the obtained mixed pellets are Melt-spinning is carried out in a conventional way. After passing through a hot roller at 75°C, the resulting raw yarn is heat-drawn at 90°C with a draw ratio of 1.67, heat-set at 80°C, and reeled to obtain high heat resistance. Strength of PLA fiber.

Example Embodiment

[0028] Example 2

[0029] The weight average molecular weight is 2.05×10 4 g·mol, 98.0% optical purity of polylactic acid and tetramethylene-dibenzohydrazide are premixed uniformly, and then the premix is ​​added into a twin-screw extruder and extruded at 190°C to obtain Siya A masterbatch with a methyl-dibenzohydrazide content of 5wt%; the obtained masterbatch and the weight average molecular weight are 2.05×10 5 g·mol, optical purity of 98.0%, polylactic acid is premixed uniformly according to the content of organic small molecule nucleating agent in the fiber as 0.5wt%, and melted and mixed at 190℃, then granulated; Melt-spinning is carried out in a conventional way. After passing through a hot roller at 75°C, the resulting raw yarn is heat-stretched at 100°C with a draw ratio of 1.67, heat-set at 90°C, and reeled to obtain high heat resistance. Strength of PLA fiber.

Example Embodiment

[0030] Example 3

[0031] The weight average molecular weight is 2.80×10 4 g·mol, 98.9% optical purity of polylactic acid and N,N',N”-tricyclohexyl-1,3,5-benzenetricarboxamide are premixed uniformly, and then the premix is ​​added to the twin-screw extruder It was extruded and pelletized at 180°C to obtain a masterbatch with N,N',N”-tricyclohexyl-1,3,5-benzenetricarboxamide content of 10wt%; the obtained masterbatch and the weight average molecular weight were 2.80 ×10 5 g·mol, optical purity of 98.9%, polylactic acid is premixed uniformly according to the content of the organic small molecule nucleating agent in the fiber as 0.3wt%, and melted and mixed at 180℃ and then granulated; the obtained mixed pellets are Melt-spinning is carried out in a conventional way. After passing through a hot roller at 75°C, the resulting raw yarn is heat-stretched at 100°C with a draw ratio of 1.67, heat-set at 90°C, and reeled to obtain high heat resistance. Strength of PLA fiber.

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Abstract

The invention discloses a preparation method for a high heat-resistant and high-strength polylactic acid fiber. The preparation method comprises the following steps: introducing an organic small molecule nucleating agent to polylactic acid through melt mixing; then self-assembling molecules of the organic small molecule nucleating agent having the content of 0.05 to 0.5wt% to form slender and efficient nucleating microfiber highly oriented along a fiber drawing direction under the actions of a melt spinning temperature field and a shear force field, wherein the microfiber induces the polylactic acid to be crystallized to form a highly oriented crystal structure while the crystallization of the polylactic aid is remarkably accelerated, so that the finally obtained high-performance polylactic acid fiber has the crystallinity degree of 42 to 59%, the tensile strength of 400 to 690 MPa and the boiling water shrinkage of 0.65 to 4.63%. The preparation method disclosed by the invention is not only smart in concept, and simple and efficient in process, easily realizes industrial scale production and opens up a simple and effective approach for development of the high heat-resistant and high-strength polylactic acid fiber.

Description

technical field [0001] The invention belongs to the technical field of polylactic acid fiber and its preparation, and in particular relates to a polylactic acid fiber with high heat resistance and high strength and a preparation method thereof. Background technique [0002] Synthetic polymer materials are widely used in various fields of the current national economy due to their outstanding advantages such as light weight and good flexibility. However, while traditional polymer materials bring great convenience to human production and life, because their synthetic raw materials mainly come from limited petrochemical resources, and their wastes are difficult to degrade quickly in the natural environment, with the development of petrochemical With the dwindling of resources and the deteriorating white pollution problems caused by waste plastics, the development of renewable resources as raw materials and biodegradable polymer materials to replace traditional petroleum-based, n...

Claims

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Application Information

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IPC IPC(8): D01F6/92D01F1/10D01D5/08D01D5/12D01D10/02
Inventor 白红伟傅强张慧贤张琴陈枫王珂邓华
Owner SICHUAN UNIV
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