Preparation And Application Of Linear Epoxy Pre-polymer Powder

The epoxy resin (EP) is a molecular structure containing two or more epoxy groups,which compound its basic skeleton by aliphatic, alicyclic, or aromatic organic, The epoxyresin can form useful thermoset product of the polymer oligomer by the cross-lingkingreaction through epoxy groups and a vairety of curing agents. EP is the significant componentof the thermosetting resin matrix. The advantages of the epoxy resin include good adhesion,corrosion resistance, high strength, easy processing. It also play an important role in theelectronic, electrical, machinery manufacturing, chemical preservative, aerospace, shippingand many other industrial sectors. Nylon6(PA6) is a widely used thermoplastic plastic witheasy molding proccssability, good abrasion resistance and heat resistance, but its poor impactresistance and water absorption limits its application in engineering. A linear epoxypre-polymer powder by a solution polymerization method is prepared in this issue. The diredresin powder was mixed with nylon6to get EP/PA6composites, through a twin-screwextruder, extruded, pelletized, and then injection machine to inject standard spline, the bodymolecular structure characterization and analysis for linear epoxy pre-polymer wasused byinfrared spectroscopy, micro melting point apparatus for linear epoxy pre-polymer the bodymolecular structure characterization and analysis, on the mechanical properties of thecomposite material, morphology and crystalline properties were studied throughcomputer-control led clcctronic universal testing machine, differential scanning calorimetry(DSC) and thermo gravimetirc analysis. Epoxy powders were characterized by IR spectroscopy and micro melting pointapparatus, the results show that the trimellitic acid anhydride and an epoxy resin reactiongenerates a linear epoxy resin prc-polymer.To Research the mechanical properties of the composites EP/PA6bycomputcr-controlled electronic universal testing machine. The results show that themechanical properties of composite mateirals has increased significantly by adding linearepoxy pre-polymer. The tensile strength of the epoxy resin system reaches the maximumwhen the mass fraction of the system is20%. The amount of trimellitic anhydride affected thelinear epoxy pre-polymer and the mechanical properties of the composite mateirals, andthermal properties of the EP:TMA=100:24system are superior quality than the EP:丁MA-100:12system under the same conditions.Isothermal crystallization behavior of epoxy powder blend modified PA6compositeswas analysis by DSC. EP/PA6composite mateirals isothermal crystallization kinetics wasstudied by Avrami equation. Avrami exponent n values of two different proportions of theepoxy resin and nylon6blends between1.63-3.66and1.13-4.05respectively, the resultindicating that the growth of PA6crystal is two-dimensional disk-shaped growth andcocxistcnce of three-dimensional spherulites growth, then calculated the crystallizationkinetics parameters, Hoffman-Weeks Theoretical calculations showing the equilibriummelting point of the blend.Epoxy powder blend modified nylon6composites non-isothermal crystallization processwas studied by DSC. To study on the non-isothermal crystallization kinetic of it according theJcziorny Amendment Avrami equation and Mo method.Finally calculate the non-isothcrmalcrystallization kinetics parameters. Experimental results show that, the equation and themethod is suitable for managing the EP/PA6blend of non-isothermal crystallization process.The initial crystaliization stage of the EP/PA6blend composite non-isothcrmal crystallizationprocess contained both homogeneous nucleation and heterogeneous nucleation, crystal growthin the secondary crystallization stage was one-dimensional growth, tirmellitic anhydirde playthe role of heterogeneous nucleation, and promote the growth of the nuclei. The thermal properties of the composites tested by TGA, the results showed that the heatdistotrion temperature of the composite material of the EP/PA6increases with the increase inthe amount of cpoxy resin powder, the addition of EP improve the thermal stability of thesystem.