Anti-UV Function Finishing And Performance Evaluation Of Non-woven Fabrics
Dec 29, 2018
Anti-UV function finishing and performance evaluation of non-woven fabrics
In recent years, due to the destruction of the ozone layer, ultraviolet radiation reaching the ground has increased, and excessive ultraviolet rays may cause harm to the human body. Non-woven protective clothing, covering materials, geosynthetics, etc. for working under strong ultraviolet light in the field should also have UV protection properties.
At present, the methods for forming the anti-ultraviolet property of the fiber material mainly include the anti-ultraviolet fiber method and the anti-ultraviolet finishing. The UV-blocking fiber is prepared by adding an ultraviolet absorber or a shielding agent during polymerization or melt spinning to prepare an ultraviolet-shielding fiber and making it into a nonwoven material. The anti-UV finishing process combines the anti-UV finishing agent with the non-woven material by padding, coating, etc., so that the non-woven material has a certain anti-ultraviolet function.
(3) Finishing process of anti-UV finishing agent
There are two main types of anti-UV finishing processes for nonwoven materials, namely padding and coating.
Since most of the ultraviolet absorber is insoluble in water, it is intended to be formulated into a dispersed phase solution, which is processed by padding, drying and baking. For some absorbents that have no affinity for fibers, they should be added to the working fluid or coated by a coating method. They can also be combined with some inorganic UV-reflecting agents for better results.
(4) Evaluation of UV protection performance
There are two main indicators for the UV resistance of nonwoven materials.
1. The UVF protection number (UPF) UPF value refers to the ratio of the time required for UV radiation to reach the erythema of the skin after a protective product is used, and the time to achieve the same degree of damage without the protective article. The greater the UPF value of the protective product, the stronger the protection against UV rays.
2. Ultraviolet light rate The average value of the ultraviolet transmittance of the protective material in the ultraviolet wavelength region was measured by an ultraviolet spectrophotometer. Experiments have shown that after UV protection, the UV transmittance of the protective material is greatly reduced.
Hangzhou Goldenlily Nonwoven Cloth Co., Ltd
Address: Zhejiang Hangzhou Fuyang Guohetan, Xindeng Town