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Shearing test is carried out on the joint which bonded under different precuring processes with two component adhesives of acrylic and epoxy resinrespectively. The pre curing strength is obtained, which used to analyze therelationship between the pre curing strength and time. The hoods with differentpre curing strength are baking with high temperature. The deformation ofdifferent areas of the hood is measured with gauges, and the deformationcharacteristics of the hood after baking are acquired with comparativeanalysis. Combining the components of two component adhesives and DSC test, thepre curing mechanism of different adhesive systems are studied. Therefore, thekey factors and regular pattern of the deformation for the hood are obtained.The results indicate that, finally deformation of the hood after hightemperature baking varies with the pre curing time. The key of the pre curingtime of acrylic adhesives lies in the chain initiation stage of the freeradical polymerization reaction. Due to the influence of the chemicalproperties of methyl acrylate and its initiator, the pre curing reactioninduced by free radical polymerization is very fast. The shear strength of thisjoint can reach to 3.67 MPa with a pre curing time of 1 h, which quicklyachieving the pre cure strength required for deformation control. For epoxyadhesives, the rate determining step in pre curing process is theesterification reaction. Due to the influence of the structure of carboxylicacid, the esterification process is relatively long. Shear strength of thisjoint can only reach 0.87 MPa after pre curing for 4 h without externalheating.

Chemical reaction mechanism of pre-curing process of two-component adhesive based on deformation behavior for automobile hood