微胶囊改性八溴醚阻燃剂的性能研究

Study on the Properties of Double Micro-encapsulated Tetrabromobisphenol A Bis(2,3-dibromopropyl)Ether for Inflaming Retarding

八溴醚是一种既含有脂肪族溴又含有芳香族溴的高效阻燃剂,有较好的热稳定性和光稳定性,由于其熔点（85℃-105℃）比较适中,可在一般塑料加工温度下先熔融为均匀的分散体。试图用双层微胶囊包裹的方法改善八溴醚阻燃剂的热稳定性。双层微胶囊化八溴醚阻燃剂的包覆过程为：先用合适的单体合成氨基树脂预聚物,将囊芯八溴醚固体粉末乳化分散到水相后,氨基树脂预聚物以原位聚合的方式在八溴醚颗粒表面聚合成第一层膜,再使用聚乙烯醇在戊二醛交联剂的作用下原位聚合成第二层膜。研究结果表明,经过双层微胶囊包覆后,明显改善了八溴醚的热稳定性,热融化温度从105℃提高到325℃以上。

The double micro-encapsulated tetrabromobisphenol A bis（2,3-dibromopropyl）ether containing both bromo aliphatics and bromo aromatics is high efficient for inflaming retarding,because of its excellent thermal and photo stability.For manufacturing of plastic,it can be melted to be dispersive and uniform beforehand,due to its medium temperature of fusion（from 85℃ to 105℃）. In our study,using double microcapsules coated eight bromine modified aether to improve the thermal stability. The procedure of the tetrabromobisphenol A bis（2,3-dibromopropyl）ether which was encapsulated should be achieved by following steps：First,the prepolymer of amino resin was synthetized by using proper precursor; dispersing the emulsified solid powders of tetrabromobisphenol A bis（2,3-dibromopropyl）ether in aqueous solution was as followed,the initial membrane on the surface of tetrabromobisphenol A bis（2,3-dibromopropyl）ether particles was synthetized with the prepolymer of amino as precursor via the in-situ polymerization; after that,the polyving akohol using the glutaraldehyde for cross-linking was polymerized in-situ to create the last membrane. The results indicated that enwrapped with the double microcapsules,tetrabromobisphenol A bis（2,3-dibromopropyl） ether showed an obvious enhanging in the property of thermalstability,for which the melting temperature was promoted from 105℃ to 325℃ and even higher.