文档介绍：摘要摘要六溴环十二烷(HBCD)是一种新型的溴系阻燃剂,它阻燃效率高,添加量少,可用于聚苯乙烯和聚丙烯等的阻燃。但是HBCD在较高的塑料(纤维)3nq-温度下会部分分解,对加工设备造成腐蚀且影响操作环境。为了降低HBCD在加工过程中的分解量,本文以三聚氰胺甲醛树脂为囊材,用原位聚合法制备HBCD微胶囊。研究了三聚氰胺甲醛树脂预聚物的合成条件及微胶囊包覆条件对HBCD微胶囊形成的影响。实验中,首先在碱性催化剂的作用下,利用三聚氰胺与甲醛反应,制得三聚氰胺甲醛预聚物;然后用预聚物与HBCD在表面活性剂和机械搅拌的作用下制成水包油(O/W)型乳液,在酸性催化剂作用下缩聚形成交联网状结构的非水溶性聚合物,并沉积在HBCD表面形成微胶囊;最后用相关测试设备对其微胶囊形成和性能进行测定。实验证明较佳的反应条件为:在预聚物制备阶段,甲醛与三聚氰胺的摩尔比为 l:,,反应温度为70℃,反应时间为Ih,PVA加入量为反应物的 3%:在微胶囊包覆阶段,包覆芯壁材质量比为10:,包覆温度为60℃,包覆pH 值为5,搅拌速率为350r/rain,乳化时间为15rain,分散剂用量为30%,加酸方式为慢速滴加。课题对HBCD微胶囊的化学结构、外部形态、热稳定性及粒径进行了表征:由 ,。峰,表明HBCD表面已经被三聚氰胺甲醛树脂包覆;利用透射电子显微镜和扫描电子显微镜观察HBCD微胶囊外部形态,显示微胶囊囊层连续, 表面树脂颗粒分布均匀;通过热重分析仪分析微胶囊HBCD在室温到240℃可以稳定存在,热稳定性良好;激光粒度分布仪测定结果显示微胶囊HBCD粒径分布均匀, ,有利于与塑料原料的混合。关键词溴系阻燃剂;微胶囊:原位聚合法;六溴环十二烷;三聚氰胺甲醛树脂河北科技大学硕十学何论文 Abstract Hexabromocyclododecane(HBCD)is a new kind of bromine-containing flame has high flame-resistant efficiency and low can be used in polystyrene,polypropylene and athighprocessing temperatures,part ofHBCD posed,the equipments ofprocessing are corroded,the environment improve thethermal stability ofHBCD,micro—capsulated HBCD isprepared intheway of in-situpolymerization and using the melamine formaldehyde thispaper,the effects of synthesis conditions for melamine formaldehyde resin prepolymer and microcapsule on thestateofmicro—encapsulation are discussed. The reaction was occurred between melamine and formaldehyde inbasic catalyst. The melamine formaldehyde resinprepolymer was then,through surfactant andmechanical stirring,prepolymer and HBCD formated emulsion ofoilinwater(o/w). In acid catalyst,the non—water—soluble polymer was non-water—soluble polymer was deposited onthesurface ofHBCD intheinterfacialtension ofoil- microcapsule was ,HBCD microcapsule was analyzed and tested by different resultsindicated thatHBCD can pletely under suc