Phase change energy storage fiber with isolated chamber and preparation method thereof

Abstract

The invention provides a phase change energy storage fiber with isolation cavities. The matrix of the fiber is compact boric acid crosslinked polyvinyl alcohol. The matrix is provided with a plurality of isolation cavities which are isolated from each other, the cavities are distributed along the length of the fiber, and each cavity contains an oil soluble phase change material. The preparation method comprises the following steps: (1) preparing middle phase fluid, external phase fluid and receiving liquid; (2) by taking the oil phase change material as an internal phase fluid, respectively injecting the internal phase fluid, the middle phase fluid and the external phase fluid into an injection pipe, a transition pipe and a collecting pipe, enabling the internal phase fluid to enter the transition pipe by virtue of the injection pipe, shearing the internal phase fluid in the transition pipe into mono-dispersed drops by the middle phase fluid, enabling the middle phase fluid which carries the mono-dispersed drops to enter the collecting pipe through the transition pipe, and in the collecting pipe, carrying out crosslink curing on the components in the middle phase fluid and dehydrating to form fibers which are collected by using a receiving container for holding the receiving liquid; and (3) after the fibers in the receiving liquid are fully cured, taking out the fibers, and washing and drying to the fibers.

Description

Technical field [0001] The invention belongs to the field of phase change energy storage materials, and particularly relates to a phase change energy storage fiber with an isolated cavity and a preparation method thereof. Background technique [0002] Phase change energy storage fiber is a bidirectional temperature-regulating smart fiber. The phase change material encapsulated in the phase change energy storage fiber can undergo reversible transformation between phases according to the temperature change of the external environment, and absorb, store, and release a large amount of Heat, so as to achieve temperature adjustment. Phase change energy storage fibers are mainly used in aerospace, aviation, military and other fields. The existing preparation methods of phase change energy storage fiber or phase change energy storage fiber membrane mainly include composite spinning method, phase change material microcapsule spinning method and coaxial spinning method. [0003] The compos...

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Problems solved by technology

Although this method can solve the problem of easy leakage of phase change materials, the operation of this method is cumbersome, and in order to ensure the spinnability of the spinning solution and avoid the clogging of the spinning nozzle, this method requires the phase change microcapsules in the energy storage fiber The content is lower than 30%, and the size of the microcapsule should be less than 10 μm, which results in the limited content of phase change material in the phase change energy storage fiber prepared by this method, and its latent heat of phase change is lower than 27J / g, and the encapsulation has phase change The microcapsules of the material are randomly distributed in the fiber. Excessive size or uneven distribution of microcapsules will adversely affect the mechanical properties of the fiber.

[0005] Cong Van Do et al. used coaxial electrospinning to prepare a two-dimensional nanofiber membrane with a core-sheath structure (see Cong Van Do, Thuy Thi Thu Nguyen, Jun Seo Park, Solar Energy Materials & Solar Cells, 2012, 104, 131–139), Although the phase change energy storage fiber of this structure can encapsulate the phase change material well, only when the content of the phase change material is lower than 45% can the structure of the fiber membrane be guaranteed, and when the content of the phase change material is higher than 50% When the two-dimensional fiber membrane will appear a large number of beads, or even melt into one piece, causing the two-dimensional fiber membrane to lose its use value

This method is affected by various factors such as the voltage, the distance between the nozzle and the receiver, the injection speed, the properties of the polymer solution, etc., and its controllability is poor.

At present, the fibers prepared by this method are two-dimensional fiber membranes, and nanofiber bundles cannot be prepared accurately and controllably.

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