Tiancheng composite film manufacturers are developing in the new direction of epidemic prevention2022-12-01
During the recent epidemic, protection work is essential, and the manufacturer of Tiancheng composite film is developing in a new direction of epidemic prevention.
The main material of melt-blown non-woven fabric is polypropylene, which is a kind of ultra-fine electrostatic fiber cloth that can catch dust. When the droplets containing pneumonia virus are close to the melt-blown nonwoven fabric, they will be adsorbed on the surface of the nonwoven fabric by static electricity and cannot be penetrated.
However, electrostatic adsorption masks have a huge disadvantage. After the static electricity is added, it is not always in a saturated state. In the production, packaging, delivery, transportation, and then in the hands of consumers, each link will gradually reduce the static electricity content in the non-woven fabric layer, and the attenuation of static electricity will inevitably lead to the decline of the protective efficiency of the melt-blown non-woven fabric mask.
As the wearing time increases (such as 1~2 hours), due to the human activities such as the wearer's breathing, the mask becomes damp, its electrostatic adsorption capacity is weakened, and the isolation effect becomes worse. Due to the small size of the virus, ordinary medical surgical masks cannot achieve long-term effective isolation and protection. For this reason, there are masks made of PTFE nano-film on the market.
Recently, the China Composite Materials Society published an article proposing a new direction for the development of epidemic prevention - nano masks. Nano mask has become a highly effective medical protective mask due to its high filtration performance.
Similar to ordinary medical masks, nano-bacterial masks also include outer layer, middle layer, inner layer, ear hook, nose clip and other parts. The particularity of nano mask is that the middle layer is made of nano film with smaller pore size (100-200 nm), generally PTFE material.
PTFE film prepared by unidirectional or biaxial stretching method has spider web microporous structure on its surface, and has very complex changes in three-dimensional structure, such as mesh connection, hole inlay, hole bending, etc., so it has excellent surface filtration function. The nano mask made of this material has the characteristics of high barrier efficiency, long service life, light, thin and breathable, which is the new direction of the development of the future mask.
Especially the polytetrafluoroethylene clothing film, its biggest feature is that it is breathable and impermeable. The surface of the film can reach 1.4 billion micropores per square centimeter and the diameter of each micropore is 0.5-15 microns. With this structure, the waterproof and moisture permeability function can be achieved. After the clothing film is compounded with the basic fabric, it can be widely used in medical clothing, disinfection, anti-poison and other special protective clothing.
Reusable protective clothing is generally used as daily work clothing and surgical clothing for medical staff. It is mainly made of traditional woven fabrics, high-density fabrics, coated fabrics and laminated fabrics. Because the laminated fabric is made by laminating common fabric and a special film, it has become the mainstream choice in the industry due to its good protective performance and moisture permeability.
The polytetrafluoroethylene super waterproof and moisture permeable composite fabric is a relatively high-end laminated fabric. The fabric is made of polytetrafluoroethylene as raw material, which is expanded and stretched to form a microporous film. The film is coated on various fabrics and substrates by special process to become a new filter material. Because of its small pore size, uniform distribution and large porosity, the membrane can filter dust particles including bacteria while maintaining air circulation, so as to achieve the purpose of purification and ventilation. This kind of laminated fabric is windproof, waterproof, breathable and moisture permeable, and has excellent comfort. At present, most developed countries use polytetrafluoroethylene materials. The medical multifunctional protective clothing developed with polytetrafluoroethylene composite membrane as the isolation layer has durable physical and mechanical properties such as waterproof, water repellent, antibacterial, antistatic, flame retardant, moisture permeability, etc
Yes, it has good blocking performance for blood and virus (heavy liquid or gas) under natural conditions and pressure conditions, and the blocking (filtering) efficiency is more than 99%.
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