PEG/IPDI共聚改性制备新型水性聚氨酯材料

Preparation of New Waterborne Polyurethane Materials by PEG/IPDI Copolymerization Modification

将异佛尔酮二异氰酸酯(IPDI)、聚乙二醇(PEG)作为基础单体制备水性聚氨酯,将硅烷偶联剂、羟基硅油作为改性剂提升水性聚氨酯薄膜的疏水性、耐水性和耐候性。结果表明:硅烷偶联剂添加量为8.0%时,复合薄膜的吸水率达到最小值16.7%;羟基硅油的质量分数为4.8%时,复合薄膜的接触角达到最大值95.6°。硅烷偶联剂和羟基硅油的优势具有良好的互补性,将两者进行复配,复合薄膜的吸水率和接触角分别为15.04%和107.1°,与纯水性聚氨酯相比改善41.5%和43.7%,协效改性明显;逐滴加入的改善效果更好,接触角从107.1°升至113.4°。改性后材料不仅疏水性和耐水性好,而且产品稳定、薄膜光滑平整,是一种综合性能良好的疏水性涂层材料。

Isophorone diisocyanate(IPDI) and polyethylene glycol(PEG) were used as basic monomers to prepare waterborne polyurethane. The hydrophobicity, water resistance and weather resistance of waterborne polyurethane films were improved by silane coupling agent and hydroxyl silicone oil as modifier. The results show that when the silane coupling agent content is 8.0%, the water absorption of the composite film reaches the minimum value of 16.7%. When the mass fraction of hydroxyl silicone oil is 4.8%, the contact angle of the composite film reaches the maximum of 95.6°.The advantages of silane coupling agent and hydroxyl silicone oil were well complementary. When silane coupling agent and hydroxyl silicone oil are combined, the water absorption and contact angle of the composite film are 15.04% and107.1°, respectively, which are improved by 41.5% and 43.7% compared with pure waterborne polyurethane, and the synergistic modification is obvious. The improvement effect of dropwise addition is better, and the contact angle increases from 107.1° to 113.4°. The modified material not only has good hydrophobicity and water resistance, but also has stable product and smooth film. It is a hydrophobic coating material with good comprehensive performance.