引用本文:
徐恒志, 王焕, 戴震, 黄毅萍, 许戈文. 四甲基苯二甲基二异氰酸酯基水性聚氨酯的合成和性能[J]. 应用化学,
2012, 29(6): 623-627.
doi:
10.3724/SP.J.1095.2012.00325
Citation: XU Hengzhi, WANG Huan, DAI Zhen, HUANG Yiping, XU Gewen. Synthesis and Properties of Waterborne Polyurethane Based Tetramethyl Xylene Diisocyanate[J]. Chinese Journal of Applied Chemistry, 2012, 29(6): 623-627. doi: 10.3724/SP.J.1095.2012.00325
Citation: XU Hengzhi, WANG Huan, DAI Zhen, HUANG Yiping, XU Gewen. Synthesis and Properties of Waterborne Polyurethane Based Tetramethyl Xylene Diisocyanate[J]. Chinese Journal of Applied Chemistry, 2012, 29(6): 623-627. doi: 10.3724/SP.J.1095.2012.00325
四甲基苯二甲基二异氰酸酯基水性聚氨酯的合成和性能
摘要:
采用四甲基苯二甲基二异氰酸酯、聚酯二元醇和二羟甲基丙酸为原料,合成了一系列具有不同异氰酸根与羟基摩尔比(n(-NCO)/n(-OH))的聚氨酯乳液。研究了n(-NCO)/n(-OH)对水性聚氨酯性能的影响。结果表明,当该比值增加时,乳液的粒径增大,分布变宽,结晶性降低,耐热性下降,耐水性能呈现降低的趋势。当异氰酸根与羟基摩尔比为3时,四甲基苯二甲基二异氰酸酯基水性聚氨酯的乳液粒径为10~30 nm,膜的分解温度达到275℃,24 h吸水率低于10%。
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关键词:
- 水性聚氨酯
- / 四甲基苯二甲基二异氰酸酯
- / 热性能
- / 耐水
English
Synthesis and Properties of Waterborne Polyurethane Based Tetramethyl Xylene Diisocyanate
Abstract:
A series of waterborne polyurethane(WPU) dispersions with different molar ratio of -NCO to -OH(n(-NCO)/n(-OH)) were synthesized using tetramethyl xylene diisocyanate(TMXDI),polyester diol and dimethylolpropionic acid as raw materials.The effect of n(-NCO)/n(-OH) on the properties of WPU was investigated.The experiment results showed that with the increase of n(-NCO)/n(-OH),the particle size increased while the particle size distribution became wider;the crystallinity,thermostability and the water resistance tend to decrease as well.When n(-NCO)/n(-OH) was 3.0,the particle size of WPU based TXMDI was fallen in the range of 10 to 30 nm,the decomposition temperature and 24 h water absorption of WPU film were 275℃ and below 10%,respectively.
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