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紫外光固化自修复剂的微胶囊化及智能防腐蚀涂层的制备
赵东,汪谟贞*,吴启超,周晓,葛学武
作者单位E-mail
赵东 中国科学技术大学中科院软物质化学重点实验室高分子材料科学与工程系合肥 230026  
汪谟贞* 中国科学技术大学中科院软物质化学重点实验室高分子材料科学与工程系合肥 230026 pstwmz@ustc.edu.cn 
吴启超 广东天安新材料股份有限公司佛山 528000  
周晓 广东天安新材料股份有限公司佛山 528000  
葛学武 中国科学技术大学中科院软物质化学重点实验室高分子材料科学与工程系合肥 230026  
摘要:
利用在水相中原位生成的聚脲甲醛沉淀吸附在可见紫外光固化组份构成的油相表面,制备了包覆自修复剂的脲醛树脂(PUF)微胶囊. 光学显微镜及SEM表明,PUF微胶囊尺寸为118~663 μm,与PUF 形成过程中的搅拌速度有关. 在中等搅拌速度(600 r/min)时,可以得到最高的包覆率(97.52wt%)和产率(65.23wt%). 将此微胶囊掺入水性聚氨酯乳胶中制成的涂层表面受损后,在紫外光照射下可以进行自修复,具有优异的金属防腐蚀性能.
关键词:  自修复,聚氨酯,金属防腐蚀,脲醛树脂微胶囊
DOI:10.1063/1674-0068/27/05/607-615
分类号:
基金项目:
Microencapsulation of UV-Curable Self-healing Agent for Smart Anticorrosive Coating
Dong Zhao,Mo-zhen Wang*,Qi-chao Wu,Xiao Zhou,Xue-wu Ge
Abstract:
UV-curable polyurethane prepolymer and photoinitiator 1173 were facilely encapsulated in a poly(urea-formaldehyde) shell, which was in situ formed by the polymerization of formalde-hyde and urea in an oil-in-water emulsion. The diameters of the microcapsules ranged from 118 μm to 663 μm depending on agitation speed, and were obtained via optical mi-croscopy and scanning electron microscopy analyses. The encapsulation percent and the yield of microcapsules prepared at the agitation speed of 600 r/min can reach 97.52wt% and 65.23wt%, respectively. When the water-borne polyurethane (WPU) coating embedded with the prepared microcapsules were scratched, the healing agent could be released from rup-tured microcapsules and lled the scribed region. The excellent anticorrosion properties of the WPU coating embedded with the prepared microcapsules were con rmed by the results obtained from both electrochemical impedance spectroscopy and Tafel curves.
Key words:  Self-healing, Water-borne polyurethane coating, Corrosion resistance, Poly(urea-formaldehyde) microcapsule, UV-curable coating