聚氨酯-环氧树脂复合体系的制备及性能研究

Synthesis and Characterization of Epoxy Resin Modified with Polyurethane

利用甲苯二异氰酸酯(TDI)与聚醚多元醇N-330及聚四氢呋喃二元醇(PF-15)为原料,制得了结构不同的聚氨酯预聚体。进一步将其与环氧树脂(E-51与E-20)进行接枝反应,最后加入固化剂双氰胺,制成了一系列环氧树脂-聚氨酯(EPR-PU)复合体系。详细考察了环氧树脂与聚氨酯预聚体的结构及用量、触变剂白碳黑的用量对EPR-PU体系性能的影响。结果表明,当原料组成的质量比为m(E-51)∶m(E-20)∶m(PU-D)∶m(PU-A)=3∶2∶0.06∶0.54时,所得EPR-PU体系同时具有较高的剪切、剥离及断裂强度。

Di-functional（PU-B） and tri-functional（PU-A and PU-D） polyurethane prepolymers were prepared from toluene diisocyanate（TDI） and polyether polyhydric alcohol（N-330 and PF-15）.Through the graft reaction of the obtained polyurethane prepolymers with epoxy resins,and then cross-linking with dicyamine,a series of epoxy resins modified with polyurethane were synthesized.The effects of structures and dosages of epoxy resins and polyurethane prepolymers,as well as the dosages of thickening agent silica derivates on the adhesive properties of EPR-PU composite system were investigated in detail.The results indicated that the optimum composition of EPR-PU system is m（E-51）∶m（E-20）∶m（PU-D）∶m（PU-A）=3∶2∶0.06∶0.54,at which the mechanical strengths of the adhesive reach the highest level.