改性水性聚氨酯用于CMYK色卡层压研究

摘要

According to the characteristics of CMYK color card, selecting suitable polyether polyols and acrylic ester, the traditional polyester type waterborne polyurethane( WPU) was modified with adjusting the NCO/OH and the amount of water chain extender. The solid mass fraction of modified WPU reached 40%, and its viscosity was 35 mPa. s. Comparing the effect of stripping on the CMYK color card from the common waterborne polyurethane, the average strength value of the modified WPU was 7.6 N/cm. The average strength value of ordinary WPU was only 3.7 N/cm. The peel strength of modified WPU had no obvious decreasing after damp heat aging resistance. Modified WPU could meet the requirements of CMYK color card as laminated waterborne polyurethane product.%针对制作证卡用CMYK色卡的特点，选择合适的助剂，对传统的普通水性聚氨酯（WPU）进行改性，并调整初始NCO/OH和水性扩链剂的量，制得固体质量分数达到40％，粘度为35mPa·s的改性WPU。比较普通WPU对CMYK色卡层压剥离及耐湿热老化的效果。结果表明，改性WPU的平均剥离强度为7.6N/cm，普通WPU的平均剥离强度仅为3.7N/cm，改性WPU经过耐湿热老化剥离强度没有明显下降，能够满足作为CMYK色卡层压用水性聚氨酯的产品要求。