Preparation Of Reactive Nano Titanium Dioxide And Its Application On Cotton Fabrics

As one of the most popular research fields in the 21st century,nanomaterials have attracted more and more attention,and nano titanium dioxide?TiO₂?is considered as one of the most valuable nanomaterials due to its antibacterial,anti-ultraviolet,self-cleaning and other properties.However,nano-TiO₂ itself has some disadvantages,such as high surface energy and large specific surface area,etc.,which cause the nanoparticles to agglomerate easily and are difficult to separate,which greatly affects the industrial production effect.At present,researchers mainly focus on the method of loading nano-TiO2 on cotton fiber by sol-gel method,powder sintering method and methods.In fact,these methods do not enable nano-TiO₂ to be firmly loaded on cotton fibers and its durability is very poor.In order to solve the problem that nano-TiO₂ has poor durability on cotton fabric and cannot be firmly fixed,this topic firstly introduces the hydroxyl group on the surface of nano titanium dioxide with silane coupling agent KH550?3-aminopropyltriethoxysilane?to introduce organic reactive group.The amino group is then reacted with trichlorotriazine to introduce a dichlorotriazine reactive group to obtain dichlorotriazine reactive nano-titanium dioxide.Because the active groups groups of dichlorotriazine reactive nano-titanium dioxide and dichlorotriazine reactive dyes are the same,the reactive dye dyeing process is used to make the nucleophilic substitution reaction between the dichlorotriazine reactive nano-TiO₂and the hydroxyl groups on the cellulose fibers to form a covalent bond.The bond combination solves the durability problem of nano titanium dioxide loading on the fabric.A dehydration condensation reaction between the hydroxyl group on the surface of the nano titanium dioxide particles and the silanol hydrolyzed by the silane coupling agent,and a reactive group amino group is introduced.The amino-modified nano-TiO₂ particles reduced the surface energy of the surface,improved the dispersibility,and the application and function were no longer restricted,and finally the amino modified nano-TiO₂ is obtained.In this reaction process,the orthogonal experimental design was used to quantitatively detec t the degree of reaction by the content of primary amino groups.The results showed that the content of the amino group per gram of the amino-modified nano-TiO₂ was 0.341 mmol.The amino modified nano-TiO₂ obtained by the above reaction is reacted with trichlorotriazine and introduced the active group of triazine to obtain dichlorotriazine reactive nano-TiO₂.Three chlorine atoms on trichlorotriazine have different reactivity.The first chlorine atom is very active and can react at 0-5°C.The second chlorine atom reacts at30-40°C.The third chlorine atom reacts at 70-90°C.So we can make the amino modified nano-TiO₂ react with trichlorotriazine nucleophilically by controlling the temperature.Orthogonal design was adopted and the reaction degree was quantitatively determined by the content of secondary amino group.The results showed that the average content of secondary amino group per gram of the dichlorotriazine reactive nano-TiO₂ is 0.302mmol.Since the structure of the dichlorotriazine reactive nano-TiO₂ is similar to that of the dichlorotriazine reactive dye,the prepared dichlorotriazine reactive nano-TiO₂ is reacted with the cellulose fiber to form a covalent bond and is supported on the cotton fabric.They were loaded on cotton fabric by padding and dipping process respectively,and the optimum finishing process of padding and dipping process respective ly were obtained by single factor experiment.The performance and surface morphology of the finished cotton fabric were characterized by FT-IR and SEM.The results showed that the newly synthesized nanoparticles were successfully loaded on cotton fabrics.In addition,the UV protection performance,self-cleaning performance,wettability,antistatic property and breaking strength of cotton fabrics treated with dichlorotriazine reactive nano-TiO₂ were tested and characterized,and nano-TiO₂ particles were proved the superiority of application on cotton fabrics.