| 高真空两级分离聚氨酯固化剂中游离TDI的研究 |
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| 引用本文： | 胡孝勇,张心亚,沈慧芳,瞿金清,陈焕钦.高真空两级分离聚氨酯固化剂中游离TDI的研究[J].涂料工业,2004,34(10):1-3. |
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| 作者姓名： | 胡孝勇 张心亚 沈慧芳 瞿金清 陈焕钦 |
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| 作者单位： | 华南理工大学化工学院,广州,510640 |
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| 摘 要： | 采取高真空两级蒸馏分离聚氨酯固化剂中的游离TDI，在MD-S80内冷式薄膜蒸发器设备上通过调整真空度和温度，将游离TDI单体降低到0．28％以下，考察了影响分离的主要因素，达到用内冷式薄膜蒸发器分离TDI的目的。得到的TDI加成物和三级蒸馏相比，工艺简单，设备投资小，说明内冷式薄膜蒸发器设备采用两级分离聚氨酯预聚物中的TDI是可行的。
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| 关 键 词： | 内冷式 游离TDI 薄膜蒸发器 聚氨酯 固化剂 预聚物 TDI加成物 设备投资 调整 考察 |
| 文章编号： | 0253-4312(2004)10-0001-03 |
| 修稿时间： | 2004年6月3日 |
Studies on High-Vacuum Two-step Separation of Free-TDI in Polyisocyanate Hardener |
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| HU Xiao-neng,ZHANG Xin-ya,SHEN Hui-fang,et al.Studies on High-Vacuum Two-step Separation of Free-TDI in Polyisocyanate Hardener[J].Paint & Coatings Industry,2004,34(10):1-3. |
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| Authors: | HU Xiao-neng ZHANG Xin-ya SHEN Hui-fang |
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| Abstract: | The free TDI in polyisocyanate is separated by use of high-vacuum distillation process. The free TDI has been reduced down to 0.28% by using the Md-S80 inner-cooled thin film evaporator at a certain vacuum and temperature. The main influencing factors on separation are discussed for fully use of the thin film evaporator to separate the free TDI. Compared to the three-step distillation process, this technology shows advantages of simple technology and less investment for facilities. It has shown that the present two-step separation by use of thin film evaporator for reduction of free TDI in polyurethane prepolymer is feasible. |
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| Keywords: | thin film evaporator inner-cooled high vacuum prepolymer separation |
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