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以聚酯二醇、甲苯二异氰酸酯、八氟戊醇、γ-氨丙基三乙氧基硅烷等为原料制得一系列氟、硅化合物封端的水性聚氨酯乳液。利用红外光谱仪、接触角测量仪、锥形量热仪等对水性聚氨酯进行结构表征和性能测试。结果表明,氟、硅被成功引入到聚氨酯分子链中,改性后乳液仍能表现出良好的离心稳定性;胶膜与水的接触角可达到106.1°,吸水率由20.8%降至1.7%,材料的疏水性能得到提高;最大热释放速率和总热释量分别由334.5 k W/m2和9.19 MJ/m2下降至245.6 k W/m2和6.66MJ/m2,聚氨酯胶膜的阻燃性能得到有效改善;同时,胶膜的热稳定性能和残炭率也得到提高。
Polyester diol, toluene diisocyanate, octafluoropentanol, γ-aminopropyl triethoxysilane as raw materials to prepare a series of fluorine, silicon compounds terminated aqueous polyurethane emulsion. The structure and characterization of waterborne polyurethane were tested by infrared spectroscopy, contact angle measurement and cone calorimeter. The results showed that fluorine and silicon were successfully introduced into the molecular chain of polyurethane, and the modified emulsion showed good centrifugal stability. The contact angle of the film with water reached 106.1 °, and the water absorption decreased from 20.8% to 1.7% , The hydrophobic property of the material was improved. The maximum heat release rate and total heat release decreased from 334.5 k W / m2 and 9.19 MJ / m2 to 245.6 k W / m2 and 6.66 MJ / m2, respectively. The flame retardancy of polyurethane film was obtained Effectively improve; the same time, the film thermal stability and carbon residue rate has also been improved.