Preparation And Application Of PBA/PMMA Core-shell Latex Particles Modiifed With Epoxy Resin

Epoxy resin has many molding of excellent adhesion properties, such as low weight，high strength，resistace conductivity, corrosion resistance，easy construction and shortconstruction period,etc. EP can be widely used in the industry, agriculture, transportation,military, science and technology and other fields. However,, but it is difficult to meet theoperating requirements of technology requirements because of that pure cured epoxy resinmaterial with high cross-linking structure which is cause easy fragility and poor anti-impacttoughness. The toughening modification of epoxy resin is processed by several method. Inrecent years, The core-shell polymer toughening is one of the research hotspots.In this paper the PBA/P(MMA-ITA-DGEBA) latex particles with core-shell structurewere prepared by semi-continuous pre-emulsion method, and the core-shell latex particlesmodified with epoxy resin were applied to mix with DYD-128. The different feeding methodsof epoxy resin were discussed, in the process for preparation of core-shell the best modifiedtechnique were defined that epoxy resin (DGEBA) and itaconicacid (ITA) occuredesterification reaction, then ITA and methyl methacrylate (MMA) occured double bondaddition reaction, DGEBA was grafted on the core-shell latex particles. The core-shellparticles were characterized by the methods of Fourier Transform Infrared Spectro-photometer (FTIR), Differential Scanning Calorimetry (DSC) and Transmission ElectronMicroscope (TEM), the resultsshowed that the distribution of interval of PBA latex particlessize were200-400nm, the average particles size of PBA were290nm, the distribution ofinterval of PBA/P(MMA-ITA-DGEBA) latex particles size were200-500nm, the averageparticles size of PBA/P(MMA-ITA-DGEBA) latex particles were340nm. Then DGEBA wasgrafted successfully on the core-shell latex particles through the functional monomer ITA byFTIR. The Core-shell structure of latex particles were proved by TEM. Mechanical propertiesof the modified nuclear shell DYD-128epoxy resin were measured. The impact strength ofthe resin was improved significantly when the nuclear shell content was10%.