Efficient antibacterial polytetrafluoroethylene microporous membrane and preparation method thereof

Abstract

The invention relates to an efficient antibacterial polytetrafluoroethylene microporous membrane and a preparation method thereof. The preparation method comprises a raw material preparation process and a membrane forming process. The raw material preparation process comprises the steps: firstly, adding 1-10 parts by weight of a zinc ion antibacterial agent into 100 parts by weight of absolute ethyl alcohol, and mixing and stirring to obtain a mixture A; adding 5-15 parts by weight of the mixture A into 100 parts by weight of a hydrocarbon additive to obtain a mixture B; and adding PTFE dispersion resin powder into the mixture B with the weight part ratio of the PTFE dispersion resin powder to the mixture B being 100:(15-25), and uniformly stirring the PTFE dispersion resin powder and the mixture B to form a pasty raw material. The zinc ion antibacterial agent is directly mixed in the raw materials of the polytetrafluoroethylene microporous membrane, and zinc ions are uniformly distributed in the polytetrafluoroethylene microporous membrane prepared by the preparation method, so that the antibacterial property of the polytetrafluoroethylene microporous membrane is greatly improved; and zinc is colorless and odorless, the original color of the product is not changed, and the polytetrafluoroethylene microporous membrane can be used in the fields of personal protection, air filtration, medical materials and the like.

Description

technical field [0001] The invention relates to a high-efficiency antibacterial polytetrafluoroethylene microporous membrane and a preparation method thereof. Background technique [0002] As people pay more and more attention to health, there are more and more requirements for antibacterial fibers in life, such as antibacterial masks, antibacterial filters, antibacterial clothing, etc. After 2000, nanofibers were used in antibacterial fibers, showing that nanomaterials superiority. [0003] At present, there are two main types of antibacterial fiber applications: [0004] The first type is to attach inorganic nano-antibacterial agents such as nano-silver and nano-copper to non-woven fibers by spraying, soaking, deposition, etc. This method can play a certain anti-bacterial effect, but because the non-woven fibers are relatively diluted, The larger the pore size, the fewer bacteria and viruses that can attach to the non-woven fabric fibers, and the corresponding bactericid...

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Problems solved by technology

[0004] The first type is to attach inorganic nano-antibacterial agents such as nano-silver and nano-copper to non-woven fibers by spraying, soaking, deposition, etc. This method can play a certain anti-bacterial effect, but because the non-woven fibers are relatively diluted, The larger the pore size, the fewer bacteria and viruses that can attach to the non-woven fabric fiber, and the corresponding bactericidal effect is also limited

[0005] The second type is the polytetrafluoroethylene microporous membrane containing nano-silver antibacterial agent. When the polytetrafluoroethylene microporous membrane is produced, the antibacterial agent is directly mixed in the raw material, such as CN 102527248 B. Because the polytetrafluoroethylene microporous membrane The gap is very small, and bacteria and viruses can be intercepted on its surface. Silver ions can effectively sterilize, which solves the problem of poor sterilization effect of the first type. However, nano-silver is easy to change color in actual use, which leads to its application field. Restrictions, such as Yuan Peng et al. mentioned in "Research Progress of Silver-based Inorganic Antibacterial Agents" in Chemical Minerals and Processing (No. 10, 2002) that silver ions are not stable enough and prone to discoloration, which limits their application; Wang Jing et al. 2013 On September 10, 2019, it was mentioned in the material bulletin "Research Progress of Silver-based Inorganic Antibacterial Materials" that because it contains silver ions, its chemical properties are active, and it is easy to transform into brown silver oxide or black elemental silver after being reduced by ultraviolet light. Reduces antimicrobial properties and will also make white or light-colored products unusable

[0006] At the same time, in view of the fact that silver is difficult to metabolize in the human body and the toxicity of nano-silver is unclear, the United States and the European Union have restricted the application of nano-silver to textiles.

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