Preparation of UV-Resistant TPU Nanofiber and Its Application in Anti-Haze Window Screening

With the rapid development of industrialization, the problem of air pollution is becoming more and more serious. The haze with PM 2.5 as the main component is the most harmful one, which is very harmful to the human respiratory system. People use a variety of methods to protect their living environment, among which the nanometer fiber anti-haze window screen is a very effective protective material. However, due to the rapid aging of the functional layer of nanofilaments after the previous exposure to the sunlight, its service life can be shortened, and the practical value of the products will be reduced. We added a composite anti-aging agent (UV 1/AN-1135) into the spinning solution to prepare polyurethane (PU) anti-aging nanofibers to improve the anti-aging properties of the prepared nanofibers and modified the contents of different UV 1/AN1135. The structure and properties of the PU nanofiber membrane were characterized and analyzed. The results showed that the addition of UV 1/AN-1135 improved the anti-aging properties of PU nanofibers. When the UV 1/AN-1135 content is 1 wt%, the fiber membrane can absorb most of the ultraviolet rays, and the nanofibers have the smallest diameter (135.97 nm). The most uniform is that the transmittance of the fiber film is above 80% and the gas permeability test result is greater than 800 mm/s. After UV aging treatment, the fiber membrane with UV 1/AN-1135 content of 1 wt% still maintains the highest tensile strength (after aging:breaking strength 21.61 MPa, breaking elongation 115.04%) and optimal filtration performance (after aging: the efficiency is 96.925%, the filtration resistance is 30.66 Pa, and the quality factor is 0.1136).