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- Solvent-based and waterborne blocked isocyanate curing agents are p repared by blocked reaction of prepolymers, which is resulted from TDI and TMP, with MEKO or alcohols-ethers mixtures. 以甲苯二异氰酸酯、三羟甲基丙烷为原料合成预聚物,分别与甲乙酮肟和多种醇醚类混合物进行封端反应,合成溶剂性和水性封闭异氰酸酯固化剂。
- The effects of different blocking agents, the mol ratio (nH: nNCO), reaction temperature and time on block reaction were studied. 讨论了封闭剂种类，活性氢与异氰酸酯基团的量之比、反应温度、反应时间对封闭反应的影响；
- The factors that affect the blocking reaction and prepolymerization reaction were investigated. 探讨了影响预聚反应和封端反应的因素。
- The blocking reaction of PAPI with nonyl phenol is studied. The effects of temperaure, time, solventand catalysts on blocking reaction are discussed. 研究了壬基苯酚与多亚甲基多苯基多异氰酸酯（PAPI）的封闭反应，探讨了温度、反应时间、催化剂、溶剂等因素对异氰酸酯封闭反应的影响。
- Methods for the modification of isocyanates include process of urethane,dimerization,trimerization,biuret,carbodiimide,and blocking reaction,etc. 异氰酸酯的改性方法包括氨酯改性、二聚改性、三聚改性、缩二脲改性、碳化二亚胺改性和封闭改性等。
- The results showed that the blocking reaction was a second order reaction and various blocking agents had different reaction rate constant. 结果表明，六亚甲基二异氰酸酯的封闭反应是二级反应，不同的封闭物，反应速率常数不同；
- He is a great guy, a chip off the old block. 他是一位好人，就像他父亲一样。
- The effects of the amounts of three blocking agents,temperature and time on blocking reaction for prepolymer are discussed. 讨论了三种封闭剂不同加量、温度和时间对聚氨酯预聚体封闭反应的影响。
- The effects of reaction temperature, ratio of amount of substance,polyurethane prepolymers on rate of blocking reaction of ethylene glycol monoalkyl ethers were studied. 本文讨论了反应温度,物质的量比和聚氨酯预聚体对乙二醇单烷基醚的封闭反应速度的影响。
- A severe snowstorm blocked up railroads. 一场暴风雪使铁路中断。
- The blocking reaction of N-methylaniline with aromatic isocyanates and aromatic polyisocyanates occur faster when compared to the aliphatic isocyanates. 对N封闭反应与芳香族异氰酸酯和芳香族聚异氰酸酯甲基苯胺发生得更快相比，脂肪族异氰酸酯。
- The trees outside the window blocked off the sun. 窗外的树木挡住了阳光。
- I have blocked in a plan of the house. 我已粗略地画出了房子的草图。
- My nose is all blocked up and I can't breathe. 我鼻子塞了，气都透不过来。
- A fall of rocks blocked the road. 掉落的岩石把路封住了。
- The road was blocked by a huge rock. 道路被一块大石头堵住了。
- That old block of flats is a real eyesore! 那座旧公寓真不顺眼！
- Could I ask for your reaction to this policy? 我能问一下您对这个政策的反应吗？
- The way ahead was blocked by fallen trees. 前面的路被倒下的树挡住了。
- The flashing lights mean that the road is blocked. 那闪动的灯光表示此路不通。
