A kind of hydrophobic gas permeable photocatalytic polymer nanocomposite film and its preparation method and application

Abstract

The invention discloses a hydrophobic and air-permeable photocatalytic polymer nanocomposite film and its preparation method and application. Its water contact angle is 145°-155°. The polymer film layer solidifies on the network substrate after phase separation. The invention uses steam-induced phase separation and surface coating technology to make the hydrogenated styrene tri-block copolymer undergo a steam-induced phase separation process on a high-strength network substrate, thereby producing a three-dimensional network-like microstructure and uniformly adhering nanoparticles on the surface On the block copolymer matrix, the required raw materials are cheap and come from a wide range of sources. There is no need for complex and expensive instruments and equipment, dangerous chemicals, and complicated chemical treatment processes. The preparation process is simple, efficient, and safe. The solvents involved can be Fully recyclable and thus environmentally friendly.

Description

technical field [0001] The invention belongs to the technical field of functional materials, and in particular relates to a hydrophobic and air-permeable photocatalytic polymer nanocomposite film and its preparation method and application. Background technique [0002] Today, air pollution has become a global threat, leading to increasing human morbidity and mortality. Especially recently, due to the continuous spread of respiratory coronaviruses around the world, more than 100 million people have been infected and more than 2 million people have died, posing a serious threat to human survival and causing huge losses to the global economy. The main route of transmission of respiratory coronavirus is droplet transmission. At the same time, Doremalen et al. (New England Journal of Medicine 2020, 382, ​​(16) 1564-1567) found that the virus can be suspended in the air for at least 3 hours. In addition, in the medical environment and public space, due to the various activities c...

AI Technical Summary

Problems solved by technology

However, how to prepare an air purification membrane filter element with excellent performance and practical application through a simple process is still a huge challenge.

E. Iliana et al. (Chemosphere, 2020, 257, 127236) doped TiO with Ag and Cu 2 , using perlite as the loading matrix to prepare photocatalytic materials, the photocatalytic materials show excellent antibacterial activity in air purification, but the preparation process is relatively complicated

[0005] The material of the photocatalytic air purification membrane filter element must be durable and efficient, low wind resistance means low pressure drop, and its preparation process is simple, the production cost is low, and it can flexibly meet different specific needs before it can be applied in practice, which also leads to its promotion and practical use. there is great difficulty

(CN105925113A and CN103013024A) disclosed superhydrophobic, three-dimensional mesh film has good waterproof and breathable performance, but the polymer adopted is styrene-butadiene block copolymer or styrene-isoprene block copolymer. There is a reactive isolated double bond in the segment copolymer, which is sensitive to the photocatalytic process and the UV-visible light irradiation and alcohol disinfection of the disinfecting process required for reuse, and is easy to age and degrade, so it is not suitable for photocatalysis. Catalytic air purification membrane filter

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