Analysis of non load bearing two component (2K) adhesives; under the automotive hemming process variations; thermogravimetric, calorimetric and composition analyses.

摘要

The work focuses on the analysis of non-load bearing, two component adhesives used in joining the automotive closures. The study is concerned with the thermo-gravimetric and the calorimetric attributes of the 2K adhesive. The study includes the impact of the robotic applicators capability, in terms of the mixing ratio between the resin and the hardener, and the mechanical mixing quality. A Fourier Transform Infrared Spectroscopy (FTIR) procedure analyzes the adhesive chemical groups and tracks the growth and decay of the hydroxyl and epoxy peaks. Additionally, the cure-rate based on a reaction-type, is investigated through a Differential Scanning Calorimetry (DSC). The variations in the Glass-Transition and Melting temperatures are also quantified. The Thermo-Gravimetric Analysis (TGA) quantifies the impact of holding time duration and conditions on the adhesive volatile content. Further, the final curing profile is investigated through the volatile evaporation rates. Adhesive application and bead placement is also evaluated using micrographs to ensure corrosion resistant and void free joints. Results from FTIR and DSC analyses revealed that; FTIR peaks can be used to determine mixing quality and curing behavior of two component adhesives qualitatively whereas DSC can be used to quantify it.