阻燃型聚氨酯丙烯酸酯UV固化胶黏剂的制备与表征

Preparation and Characterization of Flame Retardant Polyurethane Acrylate UV Curing Adhesive

分别通过接枝共聚的方法在预聚物聚氨酯丙烯酸酯(PUA)分子结构中引入P、N阻燃元素,探讨合成含磷枝化和含磷骨架聚氨酯丙烯酸酯的影响因素,并对其制备的UV固化胶黏剂的力学性能、阻燃性和热稳定性进行了研究。结果表明,当n(HMDI)∶n(PDEGA3000)∶n(FRC-2)∶n(HEA)=2.3∶1∶1∶1,w(DBTDL)=0.3%,w(MEHQ)=0.3%,w(HDDA)=20%时,合成了Mn达7200和PDI为1.53的预聚物P-PUA1;当n(HMDI)∶n(FRC-6)∶n(HEA)=2.05∶1∶2,w(DBTDL)=0.45%,w(MEHQ)=0.3%,w(HDDA)=20%时,合成了Mn达1800,PDI为1.02的预聚物P-PUA2;当m(PUA)∶m(P-PUA1)∶m(P-PUA2)=1∶1∶1,w(Irgacure1173)=3%,w(二甲基苯胺)=2%,w(HDDA)=25%时,可得到黏度6900 mPa·s、剪切强度8.19 MPa、硬度57 HD、LOI 25%、阻燃等级UL94V-2和热稳定性优异的UV固化胶黏剂。

P and N flame retardant elements were introduced into the molecular structure of prepolymer PUA by grafting and copolymerizing with discussing the factors of synthetizing phosphorus-containing and phosphorus-containing urethane acrylates.Besides,the mechanical properties,flame retardancy and thermal stability of the UV-curable adhesive prepared were investigate.The results show that when n(HMDI)∶n(PDEGA3000)∶n(FRC-2)∶n(HEA)=2.3∶1∶1∶1,w(DBTDL)=0.3%,w(MEHQ)=0.3%,w(HDDA)=20%,a prepolymer P-PUA1 with of Mn 7200 and PDI of 1.53 was synthesized;when n(HMDI)∶n(FRC-6)∶n(HEA)=2.05∶1∶2,w(DBTDL)=0.45%,w(MEHQ)=0.3%,w(HDDA)=20%,a prepolymer P-PUA2 with of Mn 1800 and PDI of 1.02 was synthesized;when m(PUA)∶m(P-PUA1)∶m(P-PUA2)=1∶1∶1,w(Irgacure1173)=3%,w(dimethylaniline)=2%,w(HDDA)=25%,a UV-curable adhesive with the viscosity of 6900 mPa·s,shear strength of 8.19 MPa,hardness of 57 HD,LOI of 25%,flame retardant grade of UL94V-2,and excellent thermal stability can be obtained.