The addition of ultraviolet absorbers to the sunshade material of the carport is mainly to extend the service life of the material and improve its performance. Ultraviolet (UV) is an invisible light in the solar spectrum, other than purple light, which can cause fluorescent substances to emit light and make currency detectors; Can sterilize and make sterilization lamps; Can promote the synthesis of vitamin D. However, ultraviolet radiation has a strong destructive effect on polymer materials. Most sunshade materials for carports are made of high molecular weight polymers, such as polyethylene, polypropylene, and other plastic materials. Under long-term exposure to ultraviolet radiation, these materials undergo photooxidation reactions, causing the molecular chains of the materials to break, resulting in a decrease in mechanical properties such as strength and toughness, and causing problems such as brittleness, discoloration, and cracking, greatly shortening the service life of carport materials.

UV absorbers are chemical substances that can absorb ultraviolet radiation and convert it into harmless heat or visible light. When UV absorbers are added to the sunshade material of the carport, these absorbers act like "shields" to "intercept" UV rays, preventing direct contact between UV rays and material molecules, thereby effectively slowing down the photodegradation process of the material. For example, some common ultraviolet absorbers, such as benzophenones, benzotriazoles, etc., form a protective film on the surface of the material, which can absorb ultraviolet light with wavelengths of 280-400 nanometers, significantly reducing the destructive effect of ultraviolet light on the material.

From the comparison of the service life of UV absorber carport materials, it can be seen that carport materials with added UV absorbers can significantly extend their service life compared to materials without added UV absorbers. Car shed materials without added UV absorbers often exhibit significant aging after outdoor use for a period of time, such as color fading, surface cracking, and reduced strength, and may need to be replaced within 1-2 years. The anti-aging performance of the shed materials added with ultraviolet absorber has been greatly improved, and the service life can be extended to 3-5 years or more, which greatly reduces the replacement frequency, reduces the use cost, and also improves the use effect and beauty of the shed. Therefore, in order to ensure the long-term stable use of sunshade materials in outdoor environments, it is necessary to add ultraviolet absorbers.