Hydrophobic breathable photocatalytic polymer nano composite membrane as well as preparation method and application thereof

Abstract

The invention discloses a hydrophobic breathable photocatalytic polymer nano composite membrane and a preparation method and application thereof. The water contact angle of the hydrophobic breathable photocatalytic polymer nano composite membrane is 145-155 degrees, and the hydrophobic breathable photocatalytic polymer nano composite membrane comprises a net-shaped substrate and a polymer membrane layer which is cured on the net-shaped substrate after mixed slurry is subjected to vapor induced phase separation in a non-solvent atmosphere. The hydrogenated styrene triblock copolymer is subjected to a steam-induced phase separation process on a high-strength net-shaped substrate through a steam-induced phase separation and surface coating technology, so that a three-dimensional net-hole-shaped microstructure is generated, nanoparticles are uniformly adhered to a block copolymer matrix, the required raw materials are low in price and wide in source, complex and expensive instruments and equipment and dangerous chemicals are not needed, a complex chemical treatment process is also not needed, the preparation process is simple, efficient and safe, and the related solvent can be completely recycled, so that the method is environment-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

Images