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CN-121992669-A - Fiber membrane with bionic radiation refrigeration and health monitoring functions and preparation method thereof

CN121992669ACN 121992669 ACN121992669 ACN 121992669ACN-121992669-A

Abstract

The application provides a fiber membrane with bionic radiation refrigeration and health monitoring functions and a preparation method thereof, which belong to the technical field of spinning, and PVDF-HFP fiber layers are obtained through dissolving PVDF-HFP in an organic solvent and carrying out electrostatic spinning; dissolving CA in an organic solvent, forming a CA fiber layer on the PVDF-HFP fiber layer through electrostatic spinning to obtain a PVDF-HFP/CA composite fiber membrane, reacting chitosan quaternary ammonium salt with NPES-20 to obtain CSfs, mixing CSfs with Al 2 O 3 for dispersion to obtain CSfs@Al 2 O 3 functional coating, spraying the coating onto the CA fiber layer surface of the composite fiber membrane, and drying to obtain the fiber membrane with bionic radiation refrigeration and health monitoring functions. The application solves the technical bottleneck that the radiation refrigeration and health monitoring functions are difficult to cooperatively integrate, and successfully prepares the multifunctional intelligent material integrating high-efficiency cooling, accurate monitoring, flexibility and ventilation.

Inventors

  • YIN XIANZE
  • BAO ZHENGHAI
  • LI ZEHAO
  • YANG SHIWEN
  • SONG YIHENG

Assignees

  • 武汉纺织大学

Dates

Publication Date
20260508
Application Date
20260110

Claims (10)

  1. 1. The preparation method of the fiber membrane with the bionic radiation refrigeration and health monitoring functions is characterized by comprising the following steps of: S1, dissolving PVDF-HFP in an organic solvent to prepare PVDF-HFP electrospinning solution, and carrying out electrospinning to obtain a PVDF-HFP fiber layer; S2, dissolving CA in an organic solvent to prepare a CA electrospun solution, and forming a CA fiber layer on the PVDF-HFP fiber layer through electrospinning to obtain a PVDF-HFP/CA composite fiber membrane; S3, reacting chitosan quaternary ammonium salt with NPES-20 to obtain CSfs, and mixing and dispersing the CSfs and the Al 2 O 3 in deionized water to obtain CSfs@Al 2 O 3 functional coating; S4, spraying the CSfs@Al 2 O 3 functional coating on the surface of the CA fiber layer of the PVDF-HFP/CA composite fiber membrane, and drying to obtain the fiber membrane with bionic radiation refrigeration and health monitoring functions.
  2. 2. The method for preparing the fiber membrane with bionic radiation refrigeration and health monitoring functions according to claim 1, wherein in the step S1, the organic solvent is prepared by mixing acetone and N, N-dimethylformamide according to the volume ratio of (2:8) - (3:7).
  3. 3. The method for preparing the fiber membrane with bionic radiation refrigeration and health monitoring functions according to claim 2, wherein the concentration of the PVDF-HFP electrospinning solution is 10-14wt%.
  4. 4. The method for preparing the fiber membrane with bionic radiation refrigeration and health monitoring functions according to claim 1, wherein in the step S2, the organic solvent is prepared by mixing acetone and N, N-dimethylformamide according to the volume ratio of (7:3) - (8:2).
  5. 5. The method for preparing the fiber membrane with bionic radiation refrigeration and health monitoring functions according to claim 4, wherein the concentration of the CA electrospun solution is 10-14wt%.
  6. 6. The method for preparing the fiber membrane with bionic radiation refrigeration and health monitoring functions according to claim 1, wherein in the step S3, the mass ratio of the chitosan quaternary ammonium salt to the NPES-20 is 1 (1-3).
  7. 7. The method for preparing the fiber membrane with bionic radiation refrigeration and health monitoring functions according to claim 1, wherein in the step S3, the total solid content of the CSfs@Al 2 O 3 functional coating is 10-15 wt%.
  8. 8. The preparation method of the fiber membrane with bionic radiation refrigeration and health monitoring functions according to claim 7, wherein the mass of the Al 2 O 3 accounts for 2.5-50% of the total solid content of the CSfs@Al 2 O 3 functional coating.
  9. 9. The method for preparing a fiber membrane with bionic radiation refrigeration and health monitoring functions according to claim 1, wherein in the step S4, the spraying amount is controlled to be 0.5-1.5 ml/16cm 2 , and the drying temperature is 30-60 ℃.
  10. 10. A fiber membrane with bionic radiation refrigeration and health monitoring functions, which is characterized by being prepared by the preparation method of the fiber membrane with bionic radiation refrigeration and health monitoring functions as claimed in any one of claims 1 to 9.

Description

Fiber membrane with bionic radiation refrigeration and health monitoring functions and preparation method thereof Technical Field The invention relates to the technical field of intelligent heat management and wearable electronics, in particular to a fiber membrane with bionic radiation refrigeration and health monitoring functions and a preparation method thereof. Background The Passive Daytime Radiation Cooling (PDRC) technology provides an ideal solution for realizing zero energy consumption cooling by efficiently reflecting sunlight and radiating human body heat energy to space by utilizing an atmospheric window of 8-14 mu m. Meanwhile, wearable health monitoring technology is continuously pushing the deep fusion of flexible electronics and textile systems as a core direction of intelligent textile development. The radiation cooling function and the physiological signal sensing capability are integrated into the single multifunctional fiber membrane, so that continuous thermal comfort guarantee can be provided for high-temperature exposure groups such as outdoor operators, real-time safety monitoring can be realized, and the fiber membrane has important application value and wide industrialization prospect. However, the effective integration of the two functions still faces a serious challenge, and the core bottleneck is the material physical mismatch and interface incompatibility problems existing between the high-performance radiation cooling layer and the high-sensitivity sensing layer. On the one hand, in order to realize excellent radiation cooling performance, high-concentration inorganic functional particles (such as Al 2O3、TiO2 and the like) are usually required to be introduced into a fiber structure so as to enhance solar reflectance and mid-infrared emissivity, but the particles are easy to agglomerate in a polymer matrix, so that uneven dispersion is caused, optical uniformity is further influenced, and fiber mechanical performance degradation is possibly caused, and in addition, the particles are difficult to stably anchor on the surface of a hydrophobic fiber and in a three-dimensional pore network by a traditional processing method, so that the particles are easy to fall off in the use process, and the durability of a refrigeration effect is seriously influenced. On the other hand, if the subsequently constructed sensing functional layer (such as conductive polymer or ion conductive coating) is directly covered on the surface of the refrigerating layer, the porous structure is often blocked or shields the active sites of functional particles, so that the solar reflection capability is obviously weakened, and meanwhile, the interface bonding force between the two functional layers is weak, delamination or cracking is easy to occur under the dynamic deformation conditions such as repeated stretching, bending and the like, so that the sensing signal is unstable and even fails. Therefore, the cooperative optimization of refrigeration and sensing performance is generally difficult to realize in the prior art, most researches are still limited to a simple lamination compounding or physical blending strategy, and the comprehensive requirements of the actual wearable scene on comfortableness, durability and multifunctional integration cannot be met due to the lack of sufficient structural stability, functional integration and long-term reliability. Chitosan and its derivatives have been widely used in the field of textile finishing due to their good biocompatibility, film-forming properties and abundant chemical modification sites. However, when the traditional chitosan material is applied to a synthetic fiber substrate as a functional coating, the problems of insufficient mechanical strength, poor water resistance, weak interfacial adhesion with hydrophobic polymers (such as PVDF-HFP and CA) and the like are often faced, and the deep application of the chitosan material as a multifunctional intermediate layer in high-performance intelligent fabrics is limited. By modifying the molecular structure of chitosan, the chitosan has excellent nanoparticle dispersing capability and strong interface bonding performance, so that inorganic functional particles are firmly anchored in a fiber network to maintain long-acting radiation cooling performance, and meanwhile, continuous and stable conductive paths can be formed by self-assembly, so that high-sensitivity and anti-interference human motion signal detection is realized, and the method is a key scientific and technical problem to be broken through urgently in the field of the current multifunctional fiber materials. In view of the above, it is necessary to design a fiber membrane with bionic radiation refrigeration and health monitoring functions and a preparation method thereof to solve the above problems. Disclosure of Invention In view of the technical problems in the background art, the application provides a fiber membrane with bionic radiation re