Why does PLA Biodegradable Non Woven Fabric have good UV stability?

The reason why PLA Biodegradable Non Woven Fabric has good UV stability is mainly attributed to the molecular structure characteristics of PLA, material modification technology, the addition of UV stabilizers and the structural characteristics of the nonwoven fabric itself. These factors work together to keep its performance stable in outdoor or long-term light environment and delay photo-oxidative degradation.

PLA molecular structure contains ester bonds and carbon-oxygen double bonds, and these chemical groups have weak UV absorption capacity, so PLA itself has better UV resistance than many other bio-based materials. However, pure PLA may still undergo photo-oxidation reaction under long-term UV irradiation, resulting in molecular chain breakage and material performance degradation. In order to further improve its weather resistance, copolymerization modification and nano-composite technology are usually used. For example, the introduction of monomers containing benzene ring structure in the synthesis process of PLA can enhance the stability of the molecular chain and reduce UV-induced degradation reactions. In addition, the addition of UV shielding agents such as nano-titanium dioxide or nano-zinc oxide can effectively reflect or scatter UV light and reduce the direct photodegradation risk of PLA.

During the production process, the weather resistance of PLA nonwovens can also be enhanced by adding specialized UV stabilizers. UV absorbers can absorb UV radiation and convert it into harmless heat energy, thereby reducing damage to PLA. In addition, hindered amine light stabilizers can inhibit the free radical chain reaction triggered by UV rays and delay material aging. Certain inorganic fillers, such as calcium carbonate or talcum powder, can not only reduce production costs, but also reduce the direct exposure of PLA by scattering UV rays, further improving UV resistance.

The porous fiber structure of PLA nonwovens also enhances its UV stability to a certain extent. The gaps between the fibers and the complex network structure can scatter some UV light, reduce the penetration depth of UV rays into the material, and thus reduce the overall photodegradation rate. This structural characteristic makes PLA nonwovens perform better in outdoor applications, such as agricultural covering materials, outdoor protective products or light-resistant packaging materials, and can maintain mechanical strength and functionality for a long time.