PDF (2156K)
摘要
以六亚甲基二异氰酸酯(HDI)为芯材,通过界面聚合法和溶胶-凝胶原位生成法制得聚氨酯(PU)/二氧化硅(SiO2)-六亚甲基二异氰酸酯(PU/SiO2-HDI)杂化微胶囊。研究了3种催化方式酸催化、碱催化、酸碱催化对杂化微胶囊产率、密封性、热稳定性以及微观形貌的影响,结果表明:与未杂化微胶囊相比,PU/SiO2-HDI杂化微胶囊的上述性能均有所提高,其中酸碱杂化微胶囊的粒径较大,分布均一,产率为71.24%,在168h浸泡条件下的泄漏率为12.03%,初始分解温度为269.43℃,在杂化微胶囊中具有最佳的性能。同时,将酸碱杂化微胶囊包埋PU防腐涂料基体中,形成的酸碱杂化涂层在盐雾腐蚀168h条件下,其划痕处被愈合,且未出现明显的腐蚀现象,具有较好的自修复和防腐作用。
Abstract
Polyurethane/silicon dioxide-hexamethylene diisocyanate (PU/SiO2-HDI) hybrid microcapsules loaded with hexamethylene diisocyanate (HDI) as core materials were prepared via interfacial polymerization and in situ sol-gel method.The effects of three kind of catalytic way,which were acid catalysis,base catalysis and acid-base catalysis on productivity,sealing,heat stability and morphology were discussed.The results indicated that the hybrid microcapsules had superior performance mentioned above,comparing with non-hybridized microcapsules.In addition,microcapsules used acid-base catalysis had the biggest partical size,excellent uniform distribution,as well as excellent productivity,sealing,heat stability,as follows,the productivity was 71.24%,the leakage rate at 168h was12.03%,and initial decomposition temperature was 269.43℃.The microcapsules used acid-base catalysis were embeded in polyurethane (PU) anticorrosion coatings,the results indicated the scratch of formed coating was healed and had no obvious corrosion phenomena by salt spray test during 168h.It can be concluded that the coatings had positive impact on self-healing and anticorrosion.
关键词
聚氨酯
/
二氧化硅
/
杂化
/
微胶囊
/
自修复
Key words
polyurethane
/
silicon dioxide
/
hybrid
/
microcapsule
/
self-healing
PU/SiO2-HDI杂化微胶囊的制备及其在自修复防腐涂层中的应用[J].
化工新型材料, 2018, 46(12): 108-111 DOI:
[1] Zhu D Y,Rong M Z,Zhang M Q.Self-healing polymeric materials based on microencapsulatedhealing agents:from design to preparation[J].Progress in Polymer Science,2015,49(2):175-220.
[2] 冯建中,明耀强,张宇帆,等.异氰酸酯胶囊型自修复高分子材料研究进展[J].化工进展,2016,35(1):175-181.
[3] Eunjoo K,Nam-Kyun K,Jihoon S,et al.Polyurethane microcapsules for self-healing paint coatings[J].RSC Advances,2014(4):16214-16223.
[4] Huang M X,Yang J L.Facile microencapsulation of HDI for self-healing anticorrosion coatings[J].Journal of Materials Chemistry,2011,21(30):11123-11130.
[5] Huang M X,Yang J L.Salt spray and EIS studies on HDI microcapsule-based self-healing anticorrosive coatings[J].Progress in Organic Coatings,2014,77(1):168-175.
[6] Huang M X,Zhang H,Yang J L.Synthesis of organic silane microcapsules for self-healing corrosion resistant polymer coatings[J].Corrosion Science,2012,65(17):561-566.
[7] Teo G H,Ng Y H,Zetterlund P B,et al.Factors influencing the preparation of hollow polymer-graphene oxide microcapsules via Pickering miniemulsion polymerization[J].Polymer,2015,63(26):1-9.
[8] 郭军红,张鹏中,慕波,等.氧化石墨烯增强聚苯乙烯/硬脂酸丁脂微胶囊相变材料的研究[J].功能材料,2016,47(12):12178-12183,12188.
[9] Wu G,An J L,Sun D W,et al.Robust microcapsules with polyurea silica hybrid shell for one-part self-healing anticorrosion coatings[J].Journal of Materials Chemistry A,2014,4(2):11614-11620.
[10] 苏政权,刘伟伦.分光光度法测聚氨酯胶粘剂中NCO含量的研究[J].聚氨酯工业,2005,20(3):39-42.
[11] 商德发,韩杰,李微,等.改性聚氨酯固相微萃取吸附材料的合成及光谱分析[J].齐齐哈尔大学学报(自然科学版),2010,26(6):41-44.
[12] 颜超.聚氨酯型相变微胶囊的制备及在Outlast/真丝织物上的应用[D].杭州:浙江理工大学,2010.
[13] 杨文涛.叔丙乳液的合成及在防腐涂料中的应用研究[D].广州:华南理工大学,2015.
[14] 余锡宾,吴虹.正硅酸乙醋的水解缩合过程研究[J].无机材料学报,1996,11(4):703-707.
[15] 林健.催化剂对正硅酸乙酯水解-聚合机理的影响[J].无机材料学报,1997,12(3):363-369.
基金资助
陕西省教育厅专项科研计划项目(17JK0134);陕西理工大学人才启动项目(SLGKYQD2-10)
