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Spandex fiber with reversible shape memory effect, and preparation method and application thereof

A technology of spandex fiber and memory effect, applied in fiber processing, fiber chemical characteristics, melt spinning, etc., can solve the problems of non-reversibility, limiting the development and application of shape memory polymer fibers, non-reversibility, etc.

Active Publication Date: 2021-04-16
WUYI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the deformation process of the one-way shape memory polymer is not reversible, the shape recovery process of the shape memory polymer fiber prepared based on the shape memory polymer is also not reversible, and can only change from a temporary shape to a permanent shape, while the above The disadvantages greatly limit the development and application of shape memory polymer fibers

Method used

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  • Spandex fiber with reversible shape memory effect, and preparation method and application thereof
  • Spandex fiber with reversible shape memory effect, and preparation method and application thereof
  • Spandex fiber with reversible shape memory effect, and preparation method and application thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0036] The preparation method of the spandex fiber with reversible shape memory effect comprises the following steps:

[0037] (1) Dissolve crystalline polyester diol or crystalline polyether diol and diisocyanate in an appropriate amount of solvent, react at 25-100°C for 1-3 hours, and react to produce polyester with isocyanate groups at both ends or polyether, then add polyurethane chain extender, react at 25-100°C for 2-24h, synthesize polyurethane prepolymer, then cool down to room temperature and add polyurethane cross-linking agent and peroxide initiator under stirring condition, by adjusting the The consumption of solvent, be mixed with the spinning stock solution that mass fraction is 35%;

[0038] (2) Degas the spinning stock solution obtained in step (1) for 30 minutes under vacuum conditions and room temperature to ensure that no air bubbles exist in the spinning stock solution, then press the spinning stock solution into the pipeline through a metering pump, and T...

Embodiment 1

[0043] Get 30 parts of molecular weight and be 3000 polycaprolactone glycols, 3.7 parts of hexamethylene diisocyanate and a small amount of dibutyltin dilaurate (catalyst) join in the three-necked flask with mechanical stirring, use tetrahydrofuran as solvent in React at 60°C for 1 hour; add 0.2 parts of 1,4-butanediol to the above system, and react at 60°C for 0.5 hours; then cool the polyurethane prepolymer solution obtained from the reaction to room temperature, and add 2.6 parts of trihydroxy Methylpropane tris(3-mercaptopropionate) and 0.9 parts of dicumyl peroxide were prepared into a spinning dope with a mass fraction of 35% by regulating the amount of tetrahydrofuran. The spinning stock solution was degassed for 30 minutes under vacuum conditions and room temperature to ensure that no air bubbles existed in the spinning stock solution. The spinning stock solution is pressed into the pipeline through the metering pump, and a thin stream of spinning stock solution is ext...

Embodiment 2

[0045] Get 20 parts of polycaprolactone diols with a molecular weight of 2000, 3.7 parts of hexamethylene diisocyanate and a small amount of catalyst dibutyltin dilaurate (catalyst) and join in a three-necked flask with mechanical stirring, using tetrahydrofuran as a solvent React at 60°C for 1h; add 0.2 parts of 1,4-butanediol to the above system, and react at 60°C for 0.5h; then cool down the polyurethane prepolymer solution obtained from the reaction to room temperature, and add 2.6 parts of three Methylolpropane tris(3-mercaptopropionate) and 0.9 part of dicumyl peroxide are prepared into a spinning dope with a mass fraction of 35% by regulating the amount of tetrahydrofuran. The spinning stock solution was degassed for 30 minutes under vacuum conditions and room temperature to ensure that no air bubbles existed in the spinning stock solution. The spinning stock solution is pressed into the pipeline through the metering pump, and a thin stream of spinning stock solution is...

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Abstract

The invention discloses a spandex fiber with a shape memory effect and a preparation method of the spandex fiber. The spandex fiber is prepared from the following components: a crystalline polyether or polyester diol monomer, a diisocyanate monomer, a polyurethane chain extender, a polyurethane cross-linking agent and a peroxide initiator. The spandex material has a double cross-linking structure, the first cross-linking structure is a cross-linking network formed by the polyurethane cross-linking agent, and the second cross-linking agent is polyurethane secondary cross-linking initiated by decomposition of the peroxide initiator; when the temperature is higher than a melting temperature of a soft section of the fiber, an oriented crystal area in the fiber is shrunk into a random coil state due to crystallization melting, and the fiber length is shortened, so that a second cross-linking network is compressed; when the temperature of the fiber is lower than a crystallization melting temperature of the spandex, molten soft segment molecular chains in the fiber are subjected to oriented crystallization again under the action of tensile stress provided by the compressed second recross-linked network in the system, and it is shown that the length of the fiber is increased; and the above process has the characteristics of repeatability and reversibility along with the change of temperature.

Description

technical field [0001] The invention belongs to the technical field of intelligent polymer materials, and in particular relates to a spandex fiber with reversible shape memory effect and its preparation method and application. Background technique [0002] Shape memory fibers can be divided into shape memory alloy fibers and shape memory polymer fibers according to the raw materials used. Shape memory alloy fibers utilize the principle of martensitic phase transition to achieve a reversible deformation process under thermal stimulation. So far, the most commonly studied and applied shape memory fibers are nickel-titanium alloy fibers. The matrix material of the shape memory polymer fiber is a shape memory polymer, and the shape memory polymer (SMP for short) can produce a recoverable deformation upon external stimulation. Shape memory polymers come in both "temporary" and "permanent" shapes. Shape memory polymers can fix temporary shapes under certain external forces and ...

Claims

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Application Information

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IPC IPC(8): D01F6/94D01F1/10D01F11/08D01D1/04D01D1/10D01D5/08D01D10/02
Inventor 范龙飞闵磊于晖吴玉潇
Owner WUYI UNIV
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