摘要
分别以不同异氰酸酯、端羟基聚二甲基硅氧烷(HTPDMS)、聚四氢呋喃醚二醇(PTMG2000)和扩链剂等为原料,采用半预聚法工艺制备了有机硅链段改性的低压缩永久变形(LCS)聚氨酯微孔弹性体(MPU)。探讨了预聚物类型、扩链剂类型、HTPDMS添加量、R值、硬段含量等因素对MPU力学性能特别是30%压缩永久变形(70℃、22 h)的影响。结果表明,采用液化MDI为异氰酸酯组分、自制902为扩链剂、R值为1.05、硬段质量分数为22%、软段中HTPDMS质量分数为15%时,压缩永久变形为1.8%,满足LCS要求。
The silicone modified microcellular polyurethane elastomers which possessed the property of low compression set（ LCS for short） were prepared with different isoeyanates, hydroxy-terminated polydimethyl siloxane （HTPDMS） , polytetramethyleneglycol （ PTMG2000 ） and cross-linking agents by semi-prepolymer process respective- ly. The effect of pre-polymer types, cross-linking agents kinds, HTPDMS mass fraction, isocyanate index and hard segment content on physical properties, especially compression set（ treated by the standard as follow：30%/70 ℃/ 22 h） had been evaluated. The results indicated that the value of compression set of microcellular polyurethane elas- tomer was decreased to 1.8% and satisfied LCS requirement, when MDI was isocyanate, homemade 902 was cross- linking agent, isocyanate index was 1.05, hard segment content was 22% and HTPDMS in soft segment was 15%.
出处
《聚氨酯工业》
2012年第3期13-16,共4页
Polyurethane Industry
关键词
聚氨酯
弹性体
微孔
低压缩永久变形
polyurethane
elastomer
microcell
low compression ,set
