Synthesis And Application Of Reactive Diphenylether Antibacterial Agent

2, 4, 4’-trichloro-2’-hydroxydiphenyl ether(triclosan) was one of the highly effective antibacterial agents for broad spectrum popular in the current international market. It had many merits: good sterilization effect, fast-acting function, being one kind of non-ionic compound, etc. It was widely applied in everyday use chemicals, textile, building materials, plastic and so on. So far, triclosan was mainly used in the textile industry through mixing with the fusing polymer to spin. Then, the antibacterial fiber was woven into fabric. Although this method might obtain the permanent antibacterial performance, it wasn’t suitable for cotton fabric. Triclosan itself wasn’t harmful to human beings, but under the high temperature during the fiber forming process it produced very toxic compounds-dioxins. Therefore, it was necessary to carry on the modification of triclosan to make new antibacterial agents which were harmless, easy to use, more durable and effective. It was the direction in which the antibacterial finishing of textile was developing.In this article, triclosan was bonded to fabric with adhesive. The antibacterial performance of the treated fabric was researched. The result was that the antibacterial rate of the fabric treated with adhesive 40g/L and latex of triclosan 10g/L for both Escherichia coli (ATCC 8099) and Staphylococcus aureus (ATCC 6538) could reach about 75% even after 50 times standard laundering. But the ventilation property of the treated fabric became poor. And, this method couldn’t avoid generating dioxins through internal compensation under the controlled condition. Therefore, two kind of reactive antibacterial agents were synthesized in the lab by introducing reactive groups to triclosan. The antibacterial finishing of cotton fabric with the two reactive antibacterial agents was researched separately and tested with bacteriostasis ring, parallel and shake flask methods.Silanol which was generated after the hydrolysis of silane coupling agent was very reactive. So, a new triclosan derivative containing silica bond was synthesized. The new derivative could react with cotton fiber and endued it with antibacterial property without generating dioxins. This new antibacterial agent was proved to be unleachable with qualitative antibacterial tests. Quantitative antibacterial tests showed that the antibacterial rate of the fabric treated with the new antibacterial agent after 50 times standard laundering was still more than 85%. Furthermore, the physical and mechanical properties of the fabric before and after finishing changed insignificantly.In order to increase the functionality of finishing agent, a new multifunctional finishing agent was produced. It endued fabric not only antibacterial property but anti-ultraviolet property. The optimal finishing process of the reactive antibacterial and anti-ultraviolet agent was investigated with a series of perpendicular experiments, namely, the bath ratio 1:15, reacting temperature 65℃, reacting time 40 minutes, sodium sulfate 40g/L, fixing temperature 85℃, fixing time 25 minutes ,sodium carbonate 20g/L. More than 65% of the agent used in finishing was found to react with the fabric with the method of ultraviolet spectrophotometer. The more the dosage was, the better the anti-ultraviolet and antibacterial properties were, showing good regularity. Both the ultraviolet protective factor (UPF) and antibacterial rate of the finished fabric preserved more than 83% after 50 times laundering. Fabric structure had an effect on UPF value. The influence of testing microbial strain and fabric structure to antibacterial property was insignificant, and the physical and mechanical properties of the fabric before and after finishing changed insignificantly.