Study On The Epoxy Resin/Polyvinyl Hloride Modified Polyurethane Foam

Orthogonal test was designed to analysis the polyurethane foamsystem. Different components had different influence to the properties ofthe foam material. Through the orthogonal test, the specific formulaswere obtained, and carried out these formulas to verify the correctness ofthe orthogonal test, the basic formula for the future experiment wasgiven.The polyurethane/epoxy resin/polyethylene glycol modified foammaterial was prepared by using the water and cyclohexane as foamingagent. Effects of polyethylene glycol, epoxy resin on the apparent density,compressive strength, impact strength and thermal stability of thepolyurethane foam were studied. With increasing contents ofpolyethylene glycol, compressive and impact strength of the foam bothfirst increased and then decreased. When contents of the polyethyleneglycol were30pphp, both compressive strength and impact strengthachieved the best level. Thermal stability of foam increased when addedepoxy resin to the system. When epoxy resin were15²0pphp, theoverall mechanical properties of foam were the best. Maximum compressive and impact strength were obtained when the cyclohexanewas10pphp and the water was1pphp.Polyvinyl chloride was used to modify the polyurethane foam.Analyzed different foam properties by using different adding style, whenthe polyvinyl chloride mixed with some dioctyl-phthalate added to thefoaming system, the foam material had the better performance. Also didsome experiments to characterize the ratio of polyvinyl chloride’sinfluence to the foam material, when the polyvinyl chloride was20pphp,the modified material had better mechanical properties.Characterized the wood-imitation material’s properties，which weremodified by polyvinyl chloride. When the stirring rate changed from200r·min^-1to2600r·min^-1, the density of the material changed from60kg·m-3to90kg·m-3，the compressive strength and impact strengthchanged from0.55Mpa to0.90Mpa,0.6kJ·m^-2to1.2kJ·m^-2. Also, thethermal stability was increased, too. When the epoxy resin was added tothe system, the density of the foam was decreased, but the epoxy resinstrengthened the pure polyurethane foam’s mechanical properties. Thewood-imitation material with high density was prepared. The density wastwice as before, but the mechanical properties increased more.Foam materials were characterized by scanning electron microscopy（SEM）, optical microscope, thermo-gravimetric analysis （TGA）,mechanical strengths and thermal distortion analysis.