MDI和硅油改性环氧树脂的制备及其在富镁底漆中的应用  

Preparation of methylene diphenyl diisocyanate and silicon-oil modified epoxy resin and its application in magnesium-rich coating

作　　者：戈成岳[1,2] 罗祥平 王静 王宁[1] 段继周[1] 侯保荣[1] GE Chengyue;LUO Xiangping;WANG Jing;WANG Ning;DUAN Jizhou;HOU Baorong(Institute of Oceanology,Chinese Academy of Sciences,Qingdao 266071,Shandong,China;Open Studio for Marine Corrosion and Protection,Pilot National Laboratory for Marine Science and Technology(Qingdao),Qingdao 266237,Shandong,China;Beijing Gas Group Co.,Ltd.,Beijing 100035,China)

机构地区：[1]中国科学院海洋研究所,山东青岛266071 [2]青岛海洋科学与技术试点国家实验室海洋腐蚀与防护开放工作室,山东青岛266237 [3]北京市燃气集团有限责任公司,北京100035

出　　处：《精细化工》2022年第9期1930-1937,共8页Fine Chemicals

基　　金：科技部重点研发计划(2019YFC0312103);国家自然科学基金资助项目(42006046);中国科学院南海生态环境工程创新研究院创新发展基金项目(ISEE2018YB05)。

摘　　要：利用二苯基甲烷二异氰酸酯(MDI)的桥接作用通过半连续滴加工艺首先合成了MDI-羟基硅油预聚物,通过FTIR和稳定性分析确定了预聚物的最佳合成工艺;然后利用含有NCO基团的预聚物和E-20环氧树脂共聚得到了MDI和硅油改性环氧树脂。通过FTIR、GPC及稳定性分析考察了催化剂用量、反应时间以及反应物配比对改性树脂性能的影响。结果表明,较优的反应条件为:m(环氧树脂)∶m(预聚物)=4∶1,二月桂酸二丁基锡用量为0.6%(以环氧树脂和预聚物总质量为基准,下同),反应时间4h。利用改性环氧树脂配制了富镁涂层,通过基本性能测试、盐雾实验和老化实验考察了涂层对铝合金的保护性能。发现涂层具有较高的附着力、柔韧性和耐冲击性,耐盐雾且耐老化性能优越。Epoxy resin modified with methylene diphenyl diisocyanate(MDI) and silicone oil was synthesized by catalyzed copolymerization of E-20 epoxy resin and a prepolymer,which was prepared via bridging interaction of MDI and hydroxy silicone oil and hold NCO group and confirmed by FTIR and stability analysis,through a semi-continuous dropping process.Subsequently,the effects of catalyst dosage,reaction time and reactant ratio on the properties of modified resin were further investigated by FTIR,GPC and stability analysis.The results showed that the optimal conditions were as follows:m(epoxy resin)∶m(prepolymer)=4∶1,catalyst dibutyltin dilaurate(DBTDL) of 0.6%(based on the total mass of E-20 and prepolymer,the same below),and reaction time of 4 h.Moreover,the protective performance of magnesium-rich coating prepared from the modified epoxy resin on aluminum alloy,conducted by basic performance test,salt spray test and aging test,demonstrated that the coating exhibited high adhesion,flexibility,impact resistance,salt spray resistance and aging resistance.

关 键 词：二苯基甲烷二异氰酸酯 羟基硅油 改性环氧树脂 富镁涂层 铝合金 建筑用化学品 

分 类 号：TQ630[化学工程—精细化工]