ساخت چسب هاي ساختاري اكريليك با استفاده از متيل متا كريليك داراي خواص چقرمگي و مقاومت محيطي بالا

چكيده انگليسي :

Preparation of Acrylic Structural Adhesive using MMA having high Toughness and Environmental Resistance Mohammad Soltani m soltani@ce iut ac ir Date of Submission Department of Chemical Engineering Isfahan University of Technology Isfahan Iran Degree M Sc Language FarsiSupervisor Rouhollah Bagheri bagheri@cc iut ac irAbstractIn this study a number of two components acrylic structural adhesives were prepared The two components whichare called base and accelerator The base part contains methyl methacrylate MMA 50 wt cumenehydroperoxide 0 5 wt ethylene glycol dimethacrylate as crosslinker 1 5 wt methacrylic acid 18 wt and30 wt of a raw rubber i e poly Chloroperen poly Acrylonitrile Butadiene poly ChlorosulphonatedPolyethylene and natural rubber as toughening agent The accelerator part consists of N N dimethylaniline 60wt butanalaniline 39 wt and Saccharin cupric salt 1 wt Butyralaniline was prepared in this work aspowder by reaction of aniline and butyraldehyde at room temperature in Stoichiometric ratio Aluminium as metalsubstrate was pretreated mechanically and chemically accorrding to ASTM standard method The two componentsof each adhesive using equal weight the components was mixed for one minute at room temperature The mixedadhesive was a viscouse liquid was immediately applied on the aluminium surface to for a uniform film Then thesecond aluminium plate specimen was fitted on the substrate containnig adhesive layer The two joint substrate wereunder a 250g load for 24h During This time the curing was occurred and the adhesive layer was set The kinetics ofcuring was investigated using a differential scanning calorimetric DSC by plotting degree of crosslink versus time The degree of cure was followed by DSC dynamic experiments for different adhesives The sample containing poly Chloroperen showed the highest crosslinking 65 at 2 min curing time Scanning electron microscopy SEM micrographs of the adhesive with poly Chloroperen showed that rubber particle shape was spherical and size ofthem was between 0 7 4 5 m Lap shear and peeling tests used to determine the strength of adhesive joints of thethis sample Lap shear strength and peeling strength of the sample were 14 9 MPa and 5 97 N mm respectively Theeffect of humidity 31 of the environment was studied on the sample containing poly Chloroperen The resultsof showed that the durability was higher for surfaces treated with sulfo ferric etchant P2 etch than other surfacetreatments The results methacrylic structural adhesive contain poly Chloroperen indicate that specimens surfacetreatment maintained 80 residual strength higher than non treatment surface on humidity environment condition room temperature at 31 RH The lap shear strength of adhesive joints was determined at several time intervalsduring exposure to three different environments at two temperatures The specimens were immersed into aqueousenvironments deionized water and saline solution or exposed to the humid environment at 25 and 50 C The jointsexposed to those immersed in deionized water and 5 wt Nacl solution showed a higher reduction in adhesivestrength A significant percentage of its initial strength after 30 days was retained The residual strength decreasesbelow 50 percent after 10 days and drops to approximately 25 percent after 30 days Lap shear of aging ofmethacrylic structural adhesive contain poly Chloroperen at 25 C for 240 hour data showed that strength 20percent decreased in aqueous condition and 55 percent decreasd for saline solution and for 50 C data showed 10percent decreased for aqueous condition Keyword Structural acrylic adhesives Lap shear peel strength surface treatment adhesion curing

سلطاني، محمد

ساخت چسب هاي ساختاري اكريليك با استفاده از متيل متا كريليك داراي خواص چقرمگي و مقاومت محيطي بالا

پيوند فلز به فلز , استحكام چسبندگي , آزمون لب به لب برشي , اصلاح سطوح