Original title: Armor against Epidemic-protective suit! Are you convinced? In 2003, in the medical battlefield against SARS, the infection rate of medical staff reached 20%, and nearly 1000 medical staff were infected! One third of the SARS deaths were caused by medical personnel, and the medical community is still deeply saddened by the casualties. In 2020, the novel coronavirus sweeping the world took the lives of a large number of health care workers. Hospital infection has always been a concern of the medical community. How to reduce the infection of medical staff is another key point in this smokeless battlefield to save lives and help the wounded. Today, let's learn about protective suit, one of the "umbrellas" of medical care, which is almost as important as masks. History of medical protective suit The origin materials of the existing medical protective suit are mainly genre paintings, sketches and some anecdotes. In the description of these materials, the purpose of doctors wearing surgical clothes is mainly to protect clothes from blood or secretions, not to protect the human body from injury. The material of early surgical gowns is generally cotton, which has no protective effect on bacteria and viruses. During World War II, the military supplies department of the United States used a very thick fabric to make military uniforms in order to adapt to the combat conditions at that time. This kind of fabric is made of very fine Bima mercerized cotton, and then treated with fluorine-containing finishing agent combined with pyridine quaternary ammonium salt or melamine hydrophobic substance for waterproof treatment, which has excellent water-repellent effect and fully meets the needs at that time. After the war, the water-repellent fabric was so marketable that it began to be used in surgical gowns. Since the 1980s, with the development of protection technology, new materials that can be used many times and are more durable have emerged, and the selection of materials for protective suit has been greatly expanded. Research on Medical Multifunctional protective suit. During medical treatment, when carrying out human body protection First of all, the virus or droplets should not be easily attached to the surface of protective clothing. Secondly,Full Body Disposable Coverall, it should be able to prevent viruses from penetrating fabrics, and viruses contaminated on clothing and masks can be removed by washing, disinfection or sterilization. At the same time, the protective suit should also be able to maintain sufficient integrity and durability, tear resistance, puncture resistance, fiber strain resistance and wear resistance, no toxic components, no linting,Quickly Delivery Disposable Protective Clothing, and good cost performance. Expand the full text According to the above requirements, antiviral protective suit should use high-performance isolation layer, combined with the corresponding functional finishing, and then use appropriate composite technology to achieve the functions of filtration and barrier, oil and water resistance, blood penetration resistance, anti-bacterial, anti-static, flame retardant, disinfection resistance, ventilation and comfort. Polyurethane film The PU membrane is a continuous non-porous micromembrane. Can be for by dry coating, wet coat, wet transfer coating, and hot melt polyurethane stretching on that fabric. Its waterproofness comes from the continuity of the film and the large film surface tension, while its moisture permeability is endowed by the molecular chains grafted or blocked with hydrophilic groups in the polymer molecules. Water molecules move outward along the dense molecular chain gaps and transfer outward through the adsorption and desorption of hydrophilic polymers. Because the waterproof performance of PU film depends on the thickness of the film, Medical Quickly Delivery Antivirus Coverall ,KN95 Face Mask, in order to achieve a higher waterproof or blood-proof ability, the thickness of the film must be increased, so that the moisture permeability is greatly reduced. Therefore, when PU film is used as medical protective suit insulation material, although the protective performance meets the requirements, the durability and comfort are poor. Polytetrafluoroethylene (PTEE) composite membrane The surface of the PTFE membrane has a spider web microporous structure, and the morphology of the micropores is a conventional fiber node structure. In order to achieve the organic unity of anti-virus, blood penetration and moisture permeability, PTFE composite membrane was prepared by improving the symmetry of micropores on the basis of maintaining the moisture permeability of PTFE membrane and stretching it with sealing materials. The PTFE composite membrane is an asymmetric structure, one side of the PTFE composite membrane has micropores, and the other side of the PTFE composite membrane basically has no micropores. The former is about 30-50 μm thick and the latter is about 10-20 μm thick. The structure maintains the original characteristics of the PTFE membrane, such as high water pressure resistance and large moisture permeability, improves the washing resistance and mechanical property of the PTFE membrane, and can block various micro viruses.
Medical protective suit Research Direction The existing standard of coated fabrics to protect against parvoviruses has been achieved, but considering the comprehensive factors such as versatility, comfort, antibacterial performance, price, environmental protection and so on, a lot of research is needed. Versatility Medical staff may be exposed to toxic gases, liquids, or infectious viruses and microorganisms, so they need protective suit that can provide protection in a variety of environments. Therefore, the design of protective fabrics must integrate a variety of functions, adopt a variety of technologies, and make all performances compatible on the same fabric, while playing their respective roles independently. Comfortable The protective suit is made of insulating material. After wearing it, the heat generated by the body is not easy to dissipate, which will make the user feel uncomfortable and affect the efficiency and quality of work. The body's temperature is regulated by sweating, and sweat must be expelled to prevent hyperthermia. Therefore, while paying attention to the barrier performance of protective suit, we should also consider the permeability of protective products. Antibacterial properties Biohazards can take many forms, and different situations require the use of antimicrobials with different activities and sterilization rates. In general, broad-spectrum antibacterial agents with fast sterilization rate should be used, and the protective suit should still be antibacterial after washing. On the other hand, the form in which the biocide is present on the protective suit also affects the effectiveness of the sterilization. In addition, the EPA raised the issue of allergenicity, requiring that antimicrobial products not be harmful to human health. Price In addition to the price of the protective suit itself, the cost of testing or improving the protective suit is also very high. Medical staff believe that protective suit should not only be effective in protection, but also be simple to use, comfortable to wear, and inexpensive. Therefore, while ensuring the protective effect, efforts must be made to reduce the cost of protective suit. Environmental protection Finishing agents such as fluorochemicals used will affect the environment, so while paying attention to the functionality of protective suit, environmental issues should also be considered. Protective suit, as an important protective means for medical staff to prevent infection in the process of treating patients, needs further study by scientific researchers in the hope of developing a more perfect protective "armor". The author is: Tian Xiaobing, Vice President of Qingdao Junrong Innovation Engineering Research Institute Sun Jun, Graduate Student,Antivirus Disposable Mask with CE Certificate, School of Chemical Engineering, Qingdao University The Doctor Says Series Extended reading: The copyright of network pictures belongs to the original author. Without permission, it is forbidden to reprint and return to Sohu to see more Responsible Editor:. zjyuan-group.com