CN-121994080-A - Individual soldier flexible tactical skin with multi-spectrum stealth and dynamic impact resistance functions and preparation method thereof

CN121994080ACN 121994080 ACN121994080 ACN 121994080ACN-121994080-A

Abstract

The invention discloses an individual soldier flexible tactical skin with multi-spectrum stealth and dynamic impact resistance functions and a preparation method thereof, and belongs to the technical field of special protective equipment. The individual soldier flexible tactical skin of the present invention comprises a fibrous textile matrix impregnated with a shear thickening fluid comprising a liquid dispersion medium, hard dispersed phase particles, electromagnetically lossy dispersed phase particles, and polylysine. During preparation, polylysine is used as a bridge structure, and the electromagnetic loss type functional filler, the hard dispersed phase nano particles and the liquid dispersion medium are uniformly mixed under the assistance of high-speed stirring and ultrasound to obtain the functional shear thickening fluid. The invention effectively solves the contradiction between the light weight, the comfort and the multifunctional protection of the traditional individual protective equipment, and successfully realizes the endogenous fusion of the dynamic impact resistance function and the high-efficiency electromagnetic stealth function in a single flexible material system.

Inventors

SUN QINGYA
Hao Tiancong
LIU YUHANG
YANG XIAONING
WANG ZIXIAO
LI ZISHUO

Assignees

南京理工大学

Dates

Publication Date: 20260508
Application Date: 20260310

Claims (10)

1. An individual soldier flexible tactical skin comprising a fibrous textile substrate impregnated with a shear thickening fluid, wherein the shear thickening fluid comprises: A liquid dispersion medium; Hard dispersed phase particles; Electromagnetic loss type dispersed phase particles, and Polylysine.
2. The individual soldier flexible tactical skin of claim 1, wherein the liquid dispersion medium is polyethylene glycol or polypropylene glycol, the hard dispersed phase particles are fumed silica or monodisperse polymer microspheres, and the fibrous fabric matrix is an aramid fiber fabric, an ultra-high molecular weight polyethylene fiber fabric or a poly-p-phenylene benzobisoxazole fiber fabric.
3. The individual soldier flexible tactical skin of claim 1, wherein the electromagnetically lossy dispersed phase particles are selected from one or more of magnetic metal/alloy micro-nano powder, magnetic oxide particles, carbon-based conductive/magnetic materials, two-dimensional transition metal carbo/nitrides.
4. The individual soldier flexible tactical skin of claim 1, wherein the shear thickening fluid comprises, by mass, 30% -55% of a liquid dispersion medium, 35% -60% of hard dispersed phase particles, 1% -20% of electromagnetic loss type dispersed phase particles, and 1% -5% of polylysine.
5. The individual soldier flexible tactical skin of claim 1, wherein the shear thickening fluid comprises, by mass, 43% liquid dispersion medium, 40% hard dispersed phase particles, 15% electromagnetically lossy dispersed phase particles, and 2% polylysine.
6. The method for preparing the individual soldier flexible tactical skin according to any one of claims 1 to 5, comprising the steps of placing a liquid dispersion medium in a container, adding polylysine for reaction, then alternately adding hard dispersed phase particles and electromagnetic loss type dispersed phase particles in batches under mechanical stirring to form mixed slurry, then carrying out high-shear dispersion treatment and high-energy ultrasonic crushing treatment on the mixed slurry to obtain a dispersion liquid, carrying out deaeration treatment on the dispersion liquid to obtain a shear thickening fluid precursor, and impregnating a fiber fabric substrate by using the shear thickening fluid precursor to obtain the individual soldier flexible tactical skin.
7. The process according to claim 6, wherein the reaction conditions of the liquid dispersion medium and the polylysine are such that the reaction is carried out under an inert atmosphere at 25-40℃for 12-24 hours.
8. The method of claim 6, wherein the high shear dispersing treatment is carried out at a rotation speed of 1000-5000rpm for 30-120min, the high energy ultrasonic crushing treatment is carried out at an ultrasonic power of 200-1000W for 30-90 min.
9. The preparation method of the single-soldier flexible tactical skin according to claim 6, wherein the specific method for impregnating the fiber fabric substrate with the shear thickening fluid precursor comprises the steps of firstly diluting the shear thickening fluid precursor with a volatile solvent, then completely immersing the fiber fabric substrate into the diluted solution until the fabric is saturated in imbibition, taking out, drying and shaping to obtain the single-soldier flexible tactical skin.
10. Use of the individual flexible tactical skin of any of claims 1-5 for the manufacture of individual body armor liners, tactical knee wraps, tactical elbow wraps, flexible exoskeletal armor and helmets.

Description

Individual soldier flexible tactical skin with multi-spectrum stealth and dynamic impact resistance functions and preparation method thereof Technical Field The invention relates to the technical field of special protective equipment, in particular to an individual soldier flexible tactical skin and a preparation method thereof. Background With the increasing complexity of modern combat environments, individual protective equipment is faced with unprecedented challenges. Battlefield threats have been limited not only to traditional kinetic energy strikes (e.g., shrapnel, bayonet, low velocity bullets, etc.), but also to increasingly severe electromagnetic spectrum threats (e.g., battlefield reconnaissance radar detection, high intensity electromagnetic interference, etc.). Therefore, development of a new generation of individual soldier protective material with high-efficiency physical protective capability and excellent electromagnetic stealth/shielding function has become an urgent need in the field of national defense technology. At present, traditional individual physical protection materials are mainly divided into two major categories of hard protection and soft protection. Although the hard protection (such as a ceramic plugboard and a metal composite board) has excellent shock resistance, the hard protection has the defects of high weight, high rigidity, air impermeability and the like, so that the tactical action flexibility of soldiers is severely limited, and the hard protection is not suitable for long-time wearing. Soft protection (such as multi-layer kevlar or ultra-high molecular weight polyethylene fabrics) is better in flexibility, but in order to achieve a sufficient protection level, often several tens of layers need to be stacked, so that the equipment is thick and heavy, and has limited effects in coping with sharp object stabs or high-speed fragment penetration. To address the contradiction between protection and comfort, "liquid armor" technology based on Shear Thickening Fluids (STF) has evolved. STF is a typical non-newtonian fluid that is normally in a liquid state and instantaneously converts to a solid-like state when subjected to high shear or impact, and is capable of absorbing and dissipating a significant amount of impact energy. The STF is immersed into the high-performance fiber fabric, so that the intelligent flexible material which is soft and comfortable at ordinary times and can be protected from instantaneous hardening can be prepared. However, conventional STF systems are generally composed of dielectric particles such as silica dispersed in polyethylene glycol, both of which are electromagnetic wave transmissive materials. Therefore, the existing STF flexible protective material is transparent in electromagnetism, basically does not have radar wave-absorbing stealth or electromagnetic shielding function, and cannot cope with the threat of modern electronic warfare. On the other hand, the existing electromagnetic wave absorbing materials are mostly in the form of coatings, plates or simple conductive fabrics. The wave-absorbing coating has poor adhesive force, is easy to fall off in tactical actions, is stiff and heavy in wave-absorbing plate, and the common conductive fiber fabric has low mechanical strength and does not have dynamic shock resistance although having a shielding function. In summary, in the current technical field, there is an urgent need for a flexible material system capable of integrating the dynamic mechanical shock resistance function and the broadband electromagnetic wave absorption function, so as to solve the technical bottleneck that the existing individual equipment is difficult to consider between light weight, comfort, physical protection and electromagnetic stealth. Disclosure of Invention Aiming at the technical defects that the single-soldier flexible protective material in the prior art has single function and is difficult to achieve the functions of dynamic mechanical shock resistance and battlefield electromagnetic stealth, the invention aims to provide the flexible tactical skin with the functions of multi-spectrum stealth, electromagnetic wave absorption and dynamic shock resistance and the preparation method thereof. The material aims to solve the difficult problems that the traditional liquid armor has no stealth capability in electromagnetic transparency, and the traditional wave absorbing material lacks dynamic mechanical protection capability, and realizes the integration of soft-hard conversion protection and electromagnetic stealth. In order to solve the problems, the technical scheme adopted by the invention is as follows: An individual soldier flexible tactical skin comprising a fibrous textile substrate impregnated with a shear thickening fluid in a stable solid-liquid suspension comprising a liquid dispersion medium, hard dispersed phase particles, electromagnetically lossy dispersed phase particles, and Polylysine (PLL)