Fluorescent whitening agent is a commonly used whitening agent in many plastic, coating, and paper manufacturers, with the characteristics of small dosage and obvious whitening effect. Especially in the hands of manufacturers of recycled materials, it has become a good medicine for revitalizing products.
Returned PVC plastic is prone to thermal oxidation during processing, resulting in the product turning dark and yellow, or yellowing due to prolonged exposure to ultraviolet light and natural oxidation reactions, all of which are normal phenomena. Some manufacturers will choose to use titanium dioxide for whitening, but after adding a large amount of titanium dioxide, it can not be made into the ideal white, but it will cause the quality of plastic to decline due to excessive addition.
The function of fluorescent whitening agent is to improve the whiteness of PVC plastics, inhibit yellowing, and improve the weatherability and anti-aging ability of products. It belongs to physical optical whitening, so adding fluorescent whitening agents to different plastic products will not change the properties of the product itself.
After the fluorescent whitening agent is added to PVC plastic, it can effectively absorb the ultraviolet light in the natural light, convert it into blue violet light and reflect it, so as to achieve the effect of yellowing and whitening. This effect can not be achieved with titanium dioxide alone.
According to the application principle of whitening agents, we can know that plastic products absorb a portion of ultraviolet light after adding fluorescent whitening agents. As the product reduces the invasion of ultraviolet light, its weather resistance naturally improves significantly, extending its service life.
Post time: Apr-28-2023