Stuffy, airtight, poor comfort, weak protection, high cost for one-time use… Is this the “Dabai” protective clothing in your impression?
Recently, the Nantong University protective clothing research and development student team started with new composite materials and developed a new type of protective clothing with active antibacterial and antiviral functions. The protective clothing breaks through the bottlenecks of poor durability of the existing protective fabrics, low antibacterial and antiviral persistence, and weak air and moisture permeability of the barrier film. The antibacterial rate is as high as 99.99%, and the antiviral activity rate is over 99.42%. It can be reused More than 50 times, and has a portable two-way temperature adjustment device.
Multi-layer reusable fabric for added protection and comfort
In the days of racing against the virus, busy medical staff and volunteers can be seen everywhere in the streets and alleys, inside and outside the community. They have a common name – “Dabai”. A white protective suit is an important barrier to protect the wearer from the virus .
At present, the mainstream medical protective clothing fabrics in the market generally use spunbond-meltblown-spunbond composite fabrics. It has deficiencies such as protective function, poor air permeability and moisture permeability, non-reusable, high cost per use, and serious pollution.
The Nantong University protective clothing research and development student team visited Jiangsu, Anhui, Shanghai and other provinces and cities, conducted in-depth investigations on 2,836 medical staff, community workers, and epidemic prevention volunteers. , developed a multi-layer high moisture permeability, reusable protective fabric.
The fabric of the new protective clothing is composed of three layers: a hydrophobic layer, an antibacterial layer and a comfortable layer. The outermost layer is the protective layer. The polyester knitted fabric is treated with a silicone hydrophobic agent, and the superhydrophobic polyester fabric is made into a superhydrophobic polyester fabric through normal temperature and pressure plasma etching and induction technology, and high temperature baking treatment, which realizes waterproof and self-cleaning functions. The test results of professional institutions show that the fabric has excellent washing fastness and rubbing fastness, which provides a guarantee for the reusability of the final product.
The middle layer of fabric is an insulating layer. The team first used the chemical in-situ reduction method to prepare a highly efficient and stable nano-silver antibacterial agent with a particle size of about 10nm in a water-based polyurethane system by adjusting the concentration of silver nitrate, the amount of polyurethane and the reaction temperature, which can achieve low loading and high antibacterial Rate. Subsequently, through the multi-nozzle electrospinning technology, the antibacterial agent was added to the spinning solution to make a high moisture permeability antibacterial and antiviral PU insulation film, which has the function of active antibacterial and antiviral while achieving physical barrier, further enhancing the protection of the protective clothing itself. Protection performance.
The innermost layer of the fabric is the comfort layer. The R&D team laminated a layer of warp-knitted mesh fabric on the inner layer of the composite fabric to protect the insulating layer in the middle, prevent it from being scratched, and further improve wearing comfort.
Comprehensively considering the protective performance and wearing comfort of the final product, the team adopts the glue dispensing composite technology. When laminating the film and the base fabric, the film surface is glued in dots, diamond-shaped glue dots. Due to the small effective adhesion area of the mesh cloth, the mesh cloth is used for gluing when attaching the mesh cloth. After repeated optimization of the amount of gluing, coating pressure, compounding pressure, curing temperature and other processes, a high degree of compounding of the three-layer structure was finally achieved, while ensuring the integrity of the structural functions of each layer, and achieving the goal of integrated design.
Professional test results show that the composite protective fabric has excellent performance in terms of filtration efficiency, water impermeability, synthetic blood penetration resistance, breaking strength, moisture permeability, water resistance, electrostatic attenuation and antibacterial properties. At the same time, after the protective clothing was decontaminated multiple times with different disinfectants, the performance of the protective fabric changed slightly in all aspects, showing excellent reusability.
Portable two-way thermostat improves human heat stress response
Regulating temperature and humidity is the key to realizing the adjustment of human body heat stress and improving comfort. In view of the common problems of stuffy and airtight protective clothing in the current market, the research and development team has further overcome the miniaturization design and processing engineering design problems of cooling and heating two-way control equipment. It mainly adopts a modular three-in-one structure, combined with 3D printing technology, integrates semiconductor components, temperature/air volume adjustment devices, power supply devices, etc., and has two upper and lower air outlets and two air inlets to achieve cooling and heating. Two modes.
At the same time, the equipment also has the function of air volume adjustment, and users can choose the gear reasonably according to their own feelings. On this basis, the R&D team has further realized the portability of the equipment, which meets the needs of carrying it around for a long time.
Based on the research and development of high moisture conductivity reusable protective fabrics and the development of two-way temperature-regulating equipment, the R&D team optimized the details of the existing protective clothing based on ergonomics, and completed the integration of protective clothing and two-way temperature-regulating devices. While ensuring the protective effect, the heat and moisture transfer effect of the clothing is greatly improved, and a new type of protective clothing is finally produced. The new type of protective clothing can meet the protection needs of users in different indoor and outdoor environments. It not only greatly improves the wearing comfort, but also greatly reduces the single-use cost.
Since February 2022, the new type of protective clothing has been tested by a total of 3,806 people in many hospitals and health units. Feedback from the use results shows that the product has reliable protective performance, is easy to put on and take off, and can effectively improve wearing comfort and work efficiency.
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