Synthesis And Application Of Reactive Hindered Amine Uvioresistant Agent

With the development of industry, pollution of waste gas became increasingly serious. The ozonosphere was destroyed, letting large amount of ultraviolet in. The radiation of ultraviolet was harmful to human beings. The research and application of ultraviolet protective textile attracted worldwide attention. The effective way to protect textile from ultraviolet radiation was to use uvioresistant agent. So the study of uvioresistant agent became one of the important subjects in the field of dyeing and finishing of textile.This research focused on improving the ultraviolet protective ability of cotton fabric. Many new reactive hindered amine uvioresistant agents were synthesized by introducing hindered amine light stabilizer(HALS) groups to the triazine UV absorbers. The Triazine UV absorbers(intermediates) were prepared with benzotriazole, para-ester, m-phenylenediamine, 2,4-diaminobenzene sulfonic acid, p-aminobenzene sulfonic acid, cyanuric chloride and so on as raw material. Then, four hindered amine uvioresistant agents were synthesized using the intermediates. Experiments showed that both the intermediates and the four hindered amine uvioresistant agents could be used as UV absorbers. The structure of the compounds was initially characterized by IR spectra which illustrating the absence of main function groups of the eight compounds. UV spectra showed that eight compounds could absorb ultraviolet radiation in 200～400nm with high intensity.The applied performances of compounds on cotton fabric as uvioresistant agent were also studied separately in this paper. The optimal finishing process of the compounds was obtained through a series of perpendicular experiments. The influence to the applied properties of the treated cotton fabric was studied on the basis of the optimal finishing process. The results showed the ultraviolet protective factor(UPF) of the cotton poplin and the cotton kinitting finished by all the compounds improved obviously. The UPF increased from 10 to 40 above when the agent dosage was 10% of the fabric weight , and ,the more the dosage was, the more the UPF increased. The results also showed the UPF of the fabric finished by the compounds preserved more than 80% after 50 times laundering. Meanwhile, the influence to the physical and mechanical performance of the finished fabric was insignificant. The light fasteness of the treated fabric all improved about 0.5～1 grade. The hindered amine uvioresistant agent could improve the light fasteness of the treated fabric more than the triazine intermediates because of the synergistic efficiency between the HALS group and the triazine UV absorber group.The results showed that all the compounds synthsised in the lab were excellent uvioresistant agents.