化工改性聚氨酯胶粘剂的制备及性能研究

Preparation and Properties of Chemical Modified Polyurethane Adhesive

以二氧化钛(TiO_(2))和二氧化钛-甲苯二异氰酸酯(TiO_(2)-TDI)为添加剂,对化工用聚氨酯胶粘剂进行改性处理,研究了TiO_(2)和TiO_(2)-TDI添加量对聚氨酯胶粘剂结构、硬度、显微形貌和老化性能的影响。结果表明,在聚氨酯胶粘剂中加入TiO_(2)和TiO_(2)-TDI改性剂,可以明显增大胶粘剂的黏度。PU的硬度要高于相同光氧老化时间下PU+0.4%TiO_(2)和PU+0.4%TiO_(2)-TDI的硬度,且相同光氧老化时间下,硬度增长率从大至小顺序为:PU>PU+0.4%TiO_(2)-TDI>PU+0.4%TiO_(2)。随着TiO_(2)和TiO_(2)-TDI添加量的增大,PU+TiO_(2)和PU+TiO_(2)-TDI改性聚氨酯胶粘剂的抗光氧老化性能会逐渐增强,且PU+TiO_(2)-TDI改性聚氨酯胶粘剂的抗光氧老化性能较好。经过TiO_(2)和TiO_(2)-TDI改性的聚氨酯胶粘剂的拉伸剪切强度要高于未经过改性的聚氨酯胶粘剂,且PU+0.4%TiO_(2)-TDI的拉伸剪切强度及拉伸剪切强度保留率最大。

Polyurethane adhesive for chemical industry was modified with titanium dioxide(TiO_(2))and titanium dioxide toluene diisocyanate(TiO_(2)-TDI)as additives.The effects of the amount of TiO_(2)and TiO_(2)-TDI on the structure,hardness,microstructure and aging properties of polyurethane adhesive were studied.The results show that adding TiO_(2)and TiO_(2)-TDI modifier to the polyurethane adhesive can significantly increase the viscosity of the adhesive.The hardness of Pu is higher than that of PU+0.4%TiO_(2)and PU+0.4%tio2-tdi under the same photo-oxidation aging time,and the order of hardness growth rates under the same photo-oxidation aging time is:PU>PU+0.4%TiO_(2)-TDI>PU+0.4%TiO_(2).With the increase of TiO_(2)and TiO_(2)-TDI,the photo oxidative aging resistance of PU+TiO_(2)and PU+TiO_(2)-TDI modified polyurethane adhesives gradually increases,and the photo oxidative aging resistance of PU+TiO_(2)-TDI modified polyurethane adhesives is better.The tensile shear strength of polyurethane adhesive modified by TiO_(2)and TiO_(2)-TDI is higher than that of unmodified polyurethane adhesive,and PU+0.4%TiO_(2)-TDI has the highest tensile shear strength and tensile shear strength retention.