文章摘要
封端含硅氧烷多异氰酸酯对涂层热力学性能的影响
Effect of Blocked Silicone Polyisocyanate on the Thermodynamic Properties of Coatings
  
DOI:10.16865/j.cnki.1000-7555.2018.07.018
中文关键词: 封端  聚醚硅氧烷  石墨化程度  热力学性能
英文关键词: blocking  polyether siloxanes  graphitization degree  thermodynamic performance
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作者单位
王 杰,耿思瑶,姚伯龙,王利魁,陈泽锐,刘 竞 食品胶体与生物技术教育部重点实验室 江南大学化学与材料工程学院,江苏 无锡 214122 
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中文摘要:
      以异佛尔酮二异氰酸酯(IPDI)和甲酸为原料,通过缩合得到缩二脲多异氰酸酯,再加入不同比例的双端羟基聚醚改性硅油(THPDMS)反应得到含硅氧烷多异氰酸酯(BP-THPDMS),并加入封端剂ε-己内酰胺封端,生成封端含硅氧烷的多异氰酸酯即涂料交联剂,将交联剂与端羟基树脂交联固化制备了耐高温弹性涂层。通过红外光谱、核磁共振氢谱对交联剂的结构进行表征验证,通过原位红外光谱测试、差示扫描量热分析探究了涂层交联固化的机理。结果表明,解封端温度为160℃,固化温度为180 ℃。通过热重分析、扫描电镜、拉曼和拉伸试验,考察了涂层的热力学性能,表明THPDMS的加入提高了涂层的耐热性和力学性能。
英文摘要:
      A biuret polyisocyanate (BP) was synthesized by polycondensation of isophorone diisocyanate (IPDI) and formic acid. Then biuret polyisocyanate (BP) and terminal hydroxyl polyether-modified silicone oil (THPDMS) with different molecular weights were used as main materials to synthesize silicone polyisocyanate (BP-THPDMS), the blocking agent (ε-caprolactam) was added to synthesize the blocked silicone polyisocyanate which is the cross-linking agent of coating. Furthermore, the cross-linking agents were mixed with hydroxyl polyster resin to prepare high-temperature resistant elastomeric coatings by cross-linking curing. The chemical composition of the cross-linking agents was characterized by 1H-NMR and FT-IR. Through in-situ IR and DSC, the mechanism of solidification was explored. The results indicate that the dissociation temperature of coating is 160 ℃ and the curing temperature of coating is 180 ℃. The thermal and mechanical property was inspected by TGA, SEM, LRS and stretch test machine. The results show that the adding of THPDMS improves the thermostability and mechanical properties of the coating.
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