CN-121975496-A - Sodium alginate-based composite phase change material, preparation method and application

CN121975496ACN 121975496 ACN121975496 ACN 121975496ACN-121975496-A

Abstract

The invention discloses a preparation method of a sodium alginate-based composite phase-change material, which comprises the following steps of preparing calcium chloride hexahydrate, preparing polypyrrole and preparing the composite phase-change material, wherein the step 1 is used for preparing the calcium chloride hexahydrate, the step 2 is used for preparing the polypyrrole, and the step 3 is used for preparing the composite phase-change material. The composite phase-change material prepared by the method has good biocompatibility, does not need to be added with an organic cosolvent when being compounded with the phase-change material, and also has excellent heat stability, cycle stability, flexibility, self-repairing and self-healing film performance and good heat storage performance per unit mass.

Inventors

ZHANG HUANZHI
Pan Zerui
PENG HONGLIANG
CAI PING
LIN XIANGCHENG
XU FEN
SUN LIXIAN

Assignees

桂林电子科技大学

Dates

Publication Date: 20260505
Application Date: 20260126

Claims (5)

1. The preparation method of the sodium alginate-based composite phase change material is characterized by comprising the following steps of: Step 1, preparing calcium chloride hexahydrate, namely placing 60g of anhydrous calcium chloride into 40g of water to prepare 100ml of calcium chloride solution, placing the calcium chloride solution into an oven at 80 ℃ and heating the calcium chloride solution for 4 hours to form the calcium chloride hexahydrate; step 2, preparing polypyrrole, namely preparing 30ml of pyrrole solution, adding 10ml of hydrogen peroxide and 3g of potassium persulfate, and carrying out exothermic reaction at a ventilation place for 1 hour to form polypyrrole powder; Step 3, preparing a composite phase change material, namely adding 0.3g of strontium chloride hexahydrate into a calcium chloride hexahydrate solution, stirring for 30 minutes in an oil bath at 80 ℃, slowly dripping 10-30ml of poly (3, 4-ethylenedioxythiophene) polystyrene sulfonate into the solution, stirring for 30 minutes in the oil bath at 80 ℃, adding 0.1g of polypyrrole powder into the solution, stirring for 30 minutes in the oil bath at 80 ℃, slowly adding 5g of sodium alginate into the solution, stirring for 30 minutes in a water bath at 50 ℃ to form a viscous liquid, pouring the viscous liquid into a film, putting the film into an oven at 80 ℃, and heating for 1440 minutes to form the sodium alginate-based composite phase change material.
2. The method for preparing a composite phase-change material based on sodium alginate according to claim 1, wherein the mass ratio of anhydrous calcium chloride, strontium chloride hexahydrate, poly-3, 4-ethylenedioxythiophene to polystyrene sulfonate, polypyrrole and sodium alginate in step 1, step 2 and step 3 is 60:0.3:1-3:0.1:5, namely the content of calcium chloride hexahydrate in step 3 is 92-94 wt%.
3. A composite phase change material prepared by a preparation method based on sodium alginate is characterized in that sodium alginate is adopted as a base material, and is combined with poly-3, 4-ethylenedioxythiophene, polystyrene sulfonate and free calcium ion supermolecules to successfully construct a composite material with high adsorption capacity and an ordered pore structure, meanwhile, calcium chloride hexahydrate is adopted as a phase change material and a solvent, and polypyrrole is adopted as an additive to be physically adsorbed between pores of the composite material, so that the composite phase change material with self-repairing, healing and photo-thermal properties is prepared.
4. Use of a sodium alginate based composite phase change material, characterized in that the use comprises at least one of the following: (1) The composite phase change material has the application of thermal management under the condition of sunlight illumination; (2) The composite phase change material has flexibility application at room temperature; (3) The composite phase change material has self-repairing application at room temperature and high temperature; (4) The composite phase change material has healing application under the conditions of adding water at room temperature and high temperature; (5) The composite phase change material is applied as a phase change material.
5. The use of a sodium alginate based composite phase change material according to claim 4, wherein the composite phase change material has a phase change temperature of 28.81-31.21 ℃ and a phase change enthalpy value of 111.67-114.36J/g when applied as a phase change material.

Description

Sodium alginate-based composite phase change material, preparation method and application Technical Field The invention relates to a composite phase change material technology, in particular to a sodium alginate-based composite phase change material, a preparation method and application thereof. Background The novel phase change material with excellent performance is obtained by creatively adding the poly-3, 4-ethylenedioxythiophene and the polystyrene sulfonate into the application of the thermal management and self-repairing self-healing composite phase change material. For example, the prior literature 1（ A flexible film sensor based on sodium alginate/silk nanofiber for real-time monitoring of the ambient temperature and personnel respiration in flame environmentCarbohydrate Polymers (IF 12.5) Pub Date : 2025-04-26 , DOI:10.1016/j.carbpol.2025.123664, literature 1, constructs natural polymers that are considered as powerful candidates for the preparation of new generation smart sensors, however, their use in fire environments is limited by low flame retardancy and thermal stability. Here, a new flexible film (SSGP) consisting entirely of biomass (i.e. natural silk nanofibers, sodium alginate and phytic acid) was developed by solution casting and self-assembly strategies. It exhibits reliable tensile properties (11.01 MPa), high flame retardance (LOI up to 38%) and thermal stability. But this solution is not combined with heat storage and has no self-healing capacity. To obtain a composite phase change material combining self-healing with thermal management junctions, prior literature 2 (Self-healing sodium alginate-PEDOT:PSS conductive hydrogel for accelerated burn wound healing and real-time monitoringChemical Engineering Journal (IF 13.2) Pub Date : 2025-08-22 , DOI:10.1016/j.cej.2025.167411) studies have shown a sodium alginate-calcium-PEDOT: PSS (SCPPC) hydrogel dressing that incorporates ionic/electronic conductivity, aimed at solving key challenges in deep burn treatment, such as regeneration damage, excessive exudation, and risk of infection. By crosslinking with dynamic ions, the hydrogels achieve skin-like conductivity (0.0026S cm-1) while exhibiting excellent injectability and conformability to irregular wounds. The optimized formulation exhibits enhanced mechanical stability (compressive stress: 21.3.+ -. 1.5 kPa, modulus: 20.8.+ -. 1.8 kPa) and dynamic viscoelasticity, capable of withstanding physiological stresses while retaining self-healing capacity (recovery after strain up to 90%). In this solution, the material is applied only in biology and is not combined with thermal management electronics. Disclosure of Invention Aiming at the defects in the prior art, the invention provides a sodium alginate-based composite phase-change material, a preparation method and application thereof, wherein the composite phase-change material prepared by the method has good biocompatibility, and meanwhile, no organic cosolvent is required to be added when the composite phase-change material is compounded with the phase-change material; the heat storage material also has excellent heat stability, cycle stability, flexibility, self-repairing and self-healing film performances, and good heat storage performance per unit mass. The technical scheme for realizing the aim of the invention is as follows: a preparation method of a sodium alginate-based composite phase change material comprises the following steps: Step 1, preparing calcium chloride hexahydrate, namely placing 60g of anhydrous calcium chloride into 40g of water to prepare 100ml of calcium chloride solution, placing the calcium chloride solution into an oven at 80 ℃, and heating the calcium chloride solution for 4 hours to form hexahydrate and calcium chloride solution; step 2, preparing polypyrrole, namely preparing 30ml of pyrrole solution, adding 10ml of hydrogen peroxide and 3g of potassium persulfate, and carrying out exothermic reaction at a ventilation place for 1 hour to form polypyrrole powder; Step 3, preparing a composite phase change material, namely adding 0.3g of strontium chloride hexahydrate into a calcium chloride hexahydrate solution, stirring for 30 minutes in an oil bath at 80 ℃, slowly dripping 10-30ml of poly (3, 4-ethylenedioxythiophene) polystyrene sulfonate into the solution, stirring for 30 minutes in the oil bath at 80 ℃, adding 0.1g of polypyrrole powder into the solution, stirring for 30 minutes in the oil bath at 80 ℃, slowly adding 5g of sodium alginate into the solution, stirring for 30 minutes in a water bath at 50 ℃ to form a viscous liquid, pouring the viscous liquid into a film, putting the film into an oven at 80 ℃, and heating for 1440 minutes to form the sodium alginate-based composite phase change material. In the steps 1, 2 and 3, the mass ratio of anhydrous calcium chloride, strontium chloride hexahydrate, poly 3, 4-ethylenedioxythiophene to polystyrene sulfonate, polypyrrole and sodium alginate is 60:0.3:1