Preparation And Properties Of Waterborne Epoxy-Alkyd Resin Nano-hybrid Materials

In order to study the curing behavior of epoxy resins (ER), and properties of thewaterborne coatings and composites, the phenolic resin (FR) and waterborne alkyd resin (AR)were synthesized. The curing behavior, thermal degradation behavior and film-formingproperties of waterborne coatings were studied. The different contents of2,3-epoxypropoxypropytrimethoxysilane (KH-560) and epoxy group polyhedral oligomericsilsesquioxanes (G-POSS) added in ER/AR systems and their composites were studied.（1）In order to further improve the toughness of epoxy resin, the waterbore alkyd resin(AR) was synthesized. The curing behavior with tertiary amine as a catalyzer was investigatedby infrared spectrometer (FTIR) and differential scanning calorimeter (DSC). The glasstransition temperature (Tg) and thermal degradation process of composites were characterizedby dynamic mechanical spectrometer (DMA), thermal analysis (TG/DTG). The mechanicaland electrical properties of the composites and film were determined. The results show thatthe tertiary amine has a good catalyzing effect for this reaction. When the mass ratio of ARwith ER is1:1, the Tgof material is64.6oC, the tensile strength, impact strength is141.67MPa and120.54kJ/m2, respectively. The surface electronic resistance and volume electronicresistance of composites are between109～1010k; the dielectric constant ε and dielectricloss tangent tanδ is between1.5～1.99and0.001-0.008, respectively. The pencil rigidity ofthe film has over4H and impact strength reached20N.（2）The epoxy resin (ER) and KH-560were used to prepare alkyd resin (AR) insulatingcoating. The modified waterborne alkyd resin insulating varnish was prepared. The dynamicmechanical properties, thermal properties and electrical properties of the composites werecharacterized by DMA, TG, et al. The results show that the tertiary amine has a goodcatalyzing effect for this reaction. When the content of KH-560is5wt%of the alkyd resin, theTgof composites increase5.6°C, the initial degradation temperature increased by63.78°C;The ρsand ρvof composites are between109～1012K; the ε and tanδ is between0.6553～0.9975and0.0025-0.0036, respectively. The pencil hard degree and the impact strength of thecoating film are all over5H and40N, respectively. （3）In order to improve the properties of epoxy resin (ER), the waterborne alkyd-epoxyresin is prepared and improved with3-glycidyloxypropyl-POSS (G-POSS). The N,N’-dimethyl benzylamine is used as a catalyst of curing reaction. The laminate of fiberglassreinforced nanocomposites is prepared from waterborne alkyd-epoxy resin with differentG-POSS content. The dynamic mechanical properties, thermal properties, mechanical andelectrical properties of the nanocomposites are characterized by dynamic mechanical analyzer(DMA), thermogravimetric analyzer (TGA), et al. The results show that the tertiary amine hasa good catalyzing effect for this reaction. When the content of G-POSS is6wt%of the alkydresin, the Tgof nanocomposites increase5.2°C, the impact strength increase53.01kJ/m2. Thenanocomposites has good electrical properties and insulating properties. The ρsand ρvofcomposites are between1011～1013; the ε and tanδ is between1.780～1.992and0.0063-0.0097, respectively.（4）The waterborne alkyd resin (AR) and MAP-POSS were used to prepare epoxy resin(ER) composites. The dynamic mechanical properties, thermal properties and electricalproperties of the composites were characterized by DMA, TG, et al. The results show that thetertiary amine has a good catalyzing effect for this reaction. When the mass ratio of AR withER is1:1, the glass transform temperature Tgof material is64.6oC,the tensile strength is141.67MPa,the impact strength is120.54kJ/m2. Add MAP-POSS, the tensile strength ofmaterial can be improved, but the impact strength will decrease. The ρsand ρvof compositesare between1013～1015cm; the ε and tanδ is between0.69～1.992and0.0079-0.0351,respectively.（5）In work, the waterborne coating of phenol-formaldehyde resin/epoxy resin wasprepared. The reaction mechanism and cure kinetics were investigated by FTIR anddifferential scanning calorimetry (DSC); the glass transition temperature Tgwas determined;the coating properties were characterized. The results show that the tertiary amine can be usedas a catalyst for this curing system. The curing reaction could be described byautocatalyticˇSesta′k–Berggren(S-B) model and kinetic equations of curing reaction wereobtained. The Tgof the material increase with increasing the content of phenolic resin, when mass ratio is1:1, the Tgis151.1oC. This coating has good physical and chemical properties;this pencil hard degree and the impact strength are all over3H and25N, respectively.