固体封闭剂封闭甲苯二异氰酸酯及其应用
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摘要
采用室温下为固体的3,5-二甲基吡唑(DMP)为封闭剂与对甲苯二异氰酸酯(TDI)反应,制备了可用于熔融挤出成型和注射成型聚氨酯复混配方的封闭型异氰酸酯单体。采用红外光谱,示差扫描量热分析和热重分析对反应过程及产物结构进行了研究。结果表明, 80℃下DMP可与TDI反应封闭完全,解封温度为180℃左右,解封产物室温即可与乙二醇反应发生加成反应,形成聚氨酯。
The blocked isocyanate monomer which could be used in melt extrusion molding and injection molding polyurethane compounding formula was prepared by reacting toluene diisocyanate(TDI)with blocking agent 3,5-dimethylpyrazole(DMP)which was solid at room temperature. The reaction process and product structure were studied by infrared spectroscopy,differential scanning calorimetry and thermogravimetric analysis. The results showed that TDI could be completely blocked with DMP at 80 ℃,and the deblocking temperature was about 180 ℃. The deblocked product could react with ethylene glycol by addition reaction at room temperature to form polyurethane.
The blocked isocyanate monomer which could be used in melt extrusion molding and injection molding polyurethane compounding formula was prepared by reacting toluene diisocyanate(TDI)with blocking agent 3,5-dimethylpyrazole(DMP)which was solid at room temperature. The reaction process and product structure were studied by infrared spectroscopy,differential scanning calorimetry and thermogravimetric analysis. The results showed that TDI could be completely blocked with DMP at 80 ℃,and the deblocking temperature was about 180 ℃. The deblocked product could react with ethylene glycol by addition reaction at room temperature to form polyurethane.
引文
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[14]刘琳,李岩.封闭型多异氰酸酯树脂的合成[J].建筑材料学报,2015,8(6):62-65.
[2]赵海军,周婷,林中祥.关于封闭异氰酸酯的研究[J].化学与黏合,2015,37(4):291-297.
[3] Subramani S,Park Y J,Lee Y S,et al. New development of polyurethane dispersion derived from blocked aromatic diisocyanate[J]. Progress in Organic Coatings,2013,48(1):71-79.
[4]杨红光,杨建军,吴庆云,等.水性聚氨酯固化剂的研究进展[J].化工新型材料,2016,44(7):15-17.
[5]曹碧辉,许飞,王成,等.基于水性封闭型异氰酸酯固化剂的水性丙烯酸烤漆的制备及性能研究[J].上海涂料,2018,56(1):1-4.
[6]孙祥,韦军.阳离子水性封闭型聚异氰酸酯交联剂的制备与性能[J].涂料工业,2016,46(5):60-64.
[7]张文琴,杨建军,吴庆云,等.水可分散型异氰酸酯固化剂的研究进展[J].化学推进剂与高分子材料,2018,16(4):24-28.
[8] Gnanarajan T P,Iyer N P,Nasar A S,et al. Synthesis and dissociation of amine-blocked diisocyanates and polyurethane prepolymers[J]. Polymer International,2012,51(3):195-202.
[9]王静,于志明,张扬,等.封闭型水性多异氰酸酯乳液的制备和表征[J].热固性树脂,2018,33(2):48-51.
[10]瞿芮,丁伟,胡佳楠,等.封闭型阳离子异氰酸酯的制备及其解封行为研究[J],化工科技,2016,24(2):36-39.
[11]赵艳娜,姬定西,任贝鸽,等.甲乙酮肟封闭水性聚氨酯/聚乙烯醇复合材料的制备及性能[J].陕西科技大学学报,2017,35(2):86-91.
[12]蒋乙峰,韦军.咪唑系水性封闭型聚异氰酸酯交联剂的制备与性能[J].高分子材料科学与工程,2016,32(2):160-163.
[13] Delebecq E,Pascault J P,Boutevin B,et al. On the versatility of urethane/urea bonds:reversibility,blocked isocyanate,and nonisocyanate polyurethane[J]. Chemical Reviews,2013,113(1):80-118.
[14]刘琳,李岩.封闭型多异氰酸酯树脂的合成[J].建筑材料学报,2015,8(6):62-65.