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1、纳米二氧化钛改性丙烯酸树脂皮革涂饰剂的研究摘要纳米二氧化钛，亦称纳米钛白粉。从尺寸大小来说，通常产生物理化学性质显著变化的细小微粒的尺寸在100纳米以下，其外观为白色疏松粉末。具有抗紫外线、抗菌、自洁净、抗老化功效，可用于化妆品、功能纤维、塑料、油墨、涂料、油漆、精细陶瓷等领域。本课题用超声波和分散剂协同分散金红石晶型纳米二氧化钛粉体，进行了分散剂的选择，通过悬浮液的稳定性的比较最终确定较佳的分散工艺：在纳米TiO2浓度为5％的条件下，分散剂六偏磷酸钠浓度0．3％、超声分散功率为540W，超声分散时间为30mi
2、n。向四口烧瓶中加入水、十二烷基硫酸钠、OP-10、丙烯酸。搅拌15min(可先预先加热油浴到42℃)加入主单体（甲基丙烯酸甲酯，丙烯酸丁酯）总量的20%，乳化45min。升温到75℃，开始滴加引发剂，1小时加完。加剩余主单体同时在另一滴管中加N-羟基丙烯酰胺、丙烯酸，1小时同时加完，然后加引发剂，30min加完，加冷凝水。74-76℃保温2h。降温到50℃，加氨水调pH值(7~8)，制得丙烯酸树脂乳液，与纳米二氧化钛共混，制得改性后的乳液，应用于皮革，发现皮革耐黄变性增强，吸水率变化不大，物理机械性能及耐干湿
3、擦强度均得到提高。关键词：纳米TiO2，分散，丙烯酸树脂，皮革涂饰剂Nano-titaniumDioxideModifiedAcrylicResinLeatherFinishingStudiesABSTRACTTitaniumdioxide,alsoknownasnano-titaniumdioxide.Fromthesize,ittypicallyproducesasignificantchangeinphysicalandchemicalpropertiesofthefineparticlesizeof10
4、0nanometersorless,theappearanceofloosepowderiswhite.Withanti-ultraviolet,antibacterial,self-cleaning,anti-agingeffects,canbeusedincosmetics,functionalfibers,plastics,inks,coatings,paints,fineceramicsandotherfields.Thesubjectultrasonicanddispersantcoordinated
5、distributedrutiletitaniumdioxidepowdersweredispersantselectedthroughcomparisonofthestabilityofthesuspensiontofinalizeabetterdispersionprocess:Inthenano-TiO2concentrationof5%oftheconditions,adispersingagentconcentrationof0.3%sodiumhexametaphosphate,ultrasonic
6、dispersingpowerof540W,ultrasonicdispersiontimewas30min.Intoafour-neckedflaskwasaddedwater,sodiumlaurylsulfate,OP-10,acrylicacid.Stirring15min(maybepre-heatedoilbathto42℃)addedtothemainmonomer(methylmethacrylate,butylacrylate)20%oftotal,emulsifying45min.Heate
7、dto75℃,begandroppinginitiator1houradditionwascomplete.PlusanotherwhileremainingdroppermainmonomeraddedN-hydroxyacrylamide,acrylicacid,1hour,whiletheadditionwascomplete,thenaddingtheinitiator,30minadditionwascomplete,addcondensate.74-76℃insulation2h.Cooledto5
8、0℃,addingammoniatoadjustpH(7-8)togiveacrylicresinemulsion,blendedwithtitaniumdioxide,toobtainthemodifiedemulsionusedinleather,leatherfoundenhancedresistancetoyellowing,waterabsorptionchangesmall
