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CN-121992530-A - Preparation method of composite phase change fiber, composite phase change fiber and application thereof

CN121992530ACN 121992530 ACN121992530 ACN 121992530ACN-121992530-A

Abstract

The application discloses a preparation method of a composite phase-change fiber, the composite phase-change fiber and application thereof, wherein the preparation method comprises (1) adding octadecane microcapsule into aqueous solution containing sodium alginate, stirring to obtain solution I; the preparation method comprises the steps of (1) adding graphene nano sheets into a solution I obtained in the step (1), stirring II to obtain a spinning solution, standing, and (3) placing the standing spinning solution obtained in the step (2) into a wet spinning device for wet spinning and drying to obtain the composite phase-change fiber, wherein in the wet spinning device, the tail end outlet of a spinning head is placed into a coagulating bath. The application has low requirements on process conditions, and the prepared phase-change fiber is linear, has the characteristics of no leakage, high heat storage density, no toxicity, good flexibility, excellent light absorption performance and the like, can adjust the enthalpy value, and has great prospect in the field of human thermal management.

Inventors

  • SHI QUAN
  • LIU HANQING
  • KOU YAN

Assignees

  • 中国科学院大连化学物理研究所

Dates

Publication Date
20260508
Application Date
20241106

Claims (10)

  1. 1. A preparation method of composite phase-change fiber is characterized in that, The preparation method comprises the following steps: (1) Adding sodium alginate into deionized water, and stirring to obtain solution I; (2) Adding the octadecane microcapsule into an aqueous solution containing sodium alginate, and stirring the solution II to obtain a solution II; (3) Adding graphene nano sheets into the solution I obtained in the step (1), stirring III to obtain spinning solution III, and standing; (4) Preparing a coagulating bath by using metal salt and water, and stirring IV to obtain spinning solution IV; (5) Standing the spinning solution obtained in the step (3), then placing the spinning solution in a wet spinning device for wet spinning, and drying to obtain the composite phase change fiber; wherein, in the wet spinning device, the terminal outlet of the spinning head is arranged in a coagulating bath.
  2. 2. The method according to claim 1, wherein, The molecular weight of the sodium alginate is 1-60 ten thousand; In the aqueous solution containing sodium alginate, the concentration of the sodium alginate is 0.01-0.03 g of sodium alginate per 1mL of water; the preparation method of the aqueous solution containing sodium alginate comprises dispersing sodium alginate in water, stirring to form aqueous solution containing sodium alginate; wherein the temperature of the stirring I is 20-60 ℃, and the stirring I time is 30-120 min.
  3. 3. The method according to claim 1, wherein, In the solution I, the concentration of the octadecane microcapsule is 0.005-0.06 g of octadecane microcapsule/1 mL of water; the temperature of the stirring II is 20-60 ℃, and the stirring time of the stirring II is 30-120 min.
  4. 4. The method according to claim 1, wherein, In the spinning solution, the concentration of the graphene nano sheets is 0-0.01 g of graphene nano sheets/1 mL of water; the sheet diameter of the graphene nano sheet is 0.5-3 mu m; the temperature of the stirring III is 20-60 ℃, and the stirring III time is 30-120 min.
  5. 5. The method according to claim 1, wherein, The standing temperature is 10-40 ℃; The standing time is 8-24 hours; the standing is performed in a vacuum environment, and the vacuum degree of the vacuum environment is 0-0.1 KPa.
  6. 6. The method according to claim 1, wherein, The metal salt is selected from at least one of CaCl 2 、ZnCl 2 、FeCl 3 、AlCl 3 ; in the coagulating bath, the mass ratio of the metal salt to the water is 3-6:100.
  7. 7. The method according to claim 1, wherein, In the course of the wet spinning process, the spinning solution, The temperature of the spinning solution is 20-60 ℃; The temperature of the coagulating bath is 20-60 ℃.
  8. 8. The method according to claim 1, wherein, The drying temperature is 20-70 ℃; the drying time is 2-24 hours.
  9. 9. A composite phase change fiber obtained by the preparation method according to any one of the claim 1 to 8, wherein, The macroscopic form of the composite phase change fiber is linear; the enthalpy value of the composite phase change fiber is 30-110J g -1 .
  10. 10. Use of the composite phase change fiber obtained by the preparation method of any one of claims 1-8 in human body thermal management temperature-regulating phase change fibers.

Description

Preparation method of composite phase change fiber, composite phase change fiber and application thereof Technical Field The application relates to a preparation method of a composite phase change fiber, the composite phase change fiber and application thereof, and belongs to the technical field of heat storage. Background Rapid development of technology and increasing human living standard have led to a substantial increase in energy demand and consumption. In particular, this need is driven mainly by the need to maintain comfortable indoor temperatures, resulting in a severe reliance on fossil energy and electrical energy, putting pressure on the environment. In order to reduce the energy consumption, there is an increasing need to focus on managing the temperature of the local environment around the human body rather than controlling the temperature of the entire indoor space. The intelligent textile can effectively control the micro-environment temperature of the human body, and is paid attention to because the intelligent textile can improve the comfort of the human body and greatly reduce the energy consumption. At present, the intelligent temperature regulating fabric mainly realizes a thermal management function through an infrared reflecting material, a phase change material and a heat insulation material. Among them, temperature regulating fabrics based on organic Phase Change Materials (PCM) are widely studied and paid attention to in the transition process due to their constant temperature characteristics in the phase change process In addition, organic PCM has other advantages such as non-toxicity, high thermal energy storage density, and excellent compatibility with the human body. However, most organic PCM undergoes solid-liquid phase transformation, and thus there are some inherent disadvantages such as liquid leakage during phase transformation and high rigidity in solid state, making it difficult to use directly. Microencapsulation is currently an effective method of encapsulating solid-liquid phase change materials, which involves encapsulating a solid-liquid phase change material core with a polymeric or inorganic shell. The shell helps to prevent leakage and shape change of the phase change material during phase change. Therefore, microcapsule-based Phase Change Fibers (PCFs) are a promising manufacturing strategy to prevent solid-liquid leakage problems. However, existing microcapsule-based PCFs still have some problems to be solved. For example, commercial Outlast thermoregulation fibers are produced by blending microcapsules with fabrics such as polyester, wherein the microcapsules are present on the surface of the polyester fibers and are easily detached. In addition, zhu et al. The polyamide 6 and microcapsule composite PCF are prepared through melt spinning, and the phase transition enthalpy of the microcapsule composite PCF is only 9.4J/g. However, the low energy storage density of these PCFs makes it difficult to meet the requirements of efficient intelligent thermal management. Based on these conditions, there is an urgent need to develop high performance PCFs with high energy storage densities, in which microcapsules can remain stable. Disclosure of Invention In the application, a simple and efficient preparation method is developed, and the phase-change fiber with super flexibility, high shape stability and high enthalpy value is prepared by taking a mixed solution of sodium alginate and octadecane microcapsule as a spinning solution. The resulting flexible PCM fibers exhibit a relatively high latent heat (up to 110J g -1). In addition, the fiber prepared by the application has important application in the field of human body thermal management by virtue of the heat absorption platform at about 25 ℃. In one aspect, the application provides a method for preparing a composite phase change fiber, which is constructed by a physical crosslinking strategy, a wet spinning technology and the like. The preparation method comprises the steps of taking sodium alginate, octadecane microcapsules and graphene nanosheets as raw materials, stirring to prepare uniform spinning precursor liquid, preparing composite phase-change fibers in a subsequent wet spinning mode, and finally washing the composite phase-change fibers with deionized water for multiple times to obtain the final phase-change fibers. Optionally, the preparation method of the composite phase change fiber comprises the following steps: (1) Adding sodium alginate into deionized water, and stirring to obtain solution I; (2) Adding the octadecane microcapsule into an aqueous solution containing sodium alginate, and stirring the solution II to obtain a solution II; (3) Adding graphene nano sheets into the solution I obtained in the step (1), stirring III to obtain spinning solution III, and standing; (4) Preparing a coagulating bath by using metal salt and water, and stirring IV to obtain spinning solution IV; (5) Standing the spin