聚酯漆包铜线表面聚酯涂层的可控降解和脱除  

Controlled Degradation and Removal of Polyester Coatings on Polyester Enameled Wire

作　　者：何静[1] 单国荣[1] 

机构地区：[1]化学工程联合国家重点实验室(浙江大学),浙江大学化学工程与生物工程学院,浙江杭州310027

出　　处：《高校化学工程学报》2016年第6期1353-1358,共6页Journal of Chemical Engineering of Chinese Universities

基　　金：国家科技支撑计划项目(2014BAC03B08)

摘　　要：以NaOH水溶液为主溶剂对聚酯漆包铜线表面的聚酯涂层进行可控降解和脱除,通过考察搅拌速度、NaOH溶液浓度、温度及溶液循环次数等工艺条件对脱漆的影响,得出适于工业化生产的聚酯涂层脱除工艺条件:NaOH溶液浓度为30%(wt)、温度为90℃、机械搅拌速度为100r×min^(-1)。在该条件下进行脱漆,脱漆时间2h左右,漆膜回收率在80%以上,铜回收率在98%以上,铜损失率在0.03%以下,脱漆剂经循环利用5次后,脱漆能力仍保持稳定。漆膜的玻璃化温度在脱漆过程中几乎没有改变,脱除的漆膜和剩余的NaOH溶液没有变黏稠。对碱液中的降解物和未降解物的分子量进行分析,未降解物分子量稍有降低,而少量降解物中无较高分子量物质。NaOH aqueous solution was used as a main solvent to degrade and remove polyester coatings on the surface of polyester enameled wire. Experimental conditions such as stirring, NaOH concentration, operation temperature and cycle time were investigated. The optimal removal conditions suitable for industrialization are： NaOH concentration 30%, removal temperature 90℃ and mechanical stirring speed 100 r·min^-1. Under these optimal conditions, polyester coating removal time of about 2 hours, coating film recovery of above 80%, copper recovery over 98% and copper loss ratio lower than 0.03% can be achieved. The coating removal ability of NaOH solution still remains stable after 5 using cycles. The glass transition temperature of the removed coating film keeps stable with no sticky coating film and sticky residual NaOH solution formed. The molecular weight and distribution of those degraded and un-degraded polyester treated by NaOH solution were analyzed. The results show that the molecular weight of un-degraded polyester slightly decreases, and no high molecular weight materials are found in the degraded polyester.

关 键 词：聚酯漆包铜线 NAOH 聚酯涂层 脱除 降解 

分 类 号：TQ319[化学工程—高聚物工业]