{"id":22491,"date":"2023-09-21T15:47:09","date_gmt":"2023-09-21T15:47:09","guid":{"rendered":"https:\/\/mascherpa.it\/non-categorizzato\/"},"modified":"2024-03-08T12:21:16","modified_gmt":"2024-03-08T12:21:16","slug":"improved-strength-and-curing-requirements-the-dupont-mercedes-case-study","status":"publish","type":"post","link":"https:\/\/mascherpa.it\/en\/blog\/improved-strength-and-curing-requirements-the-dupont-mercedes-case-study\/","title":{"rendered":"Improved strength and curing requirements: the DuPont – Mercedes case study"},"content":{"rendered":"[vc_row type=”in_container” full_screen_row_position=”middle” column_margin=”default” column_direction=”default” column_direction_tablet=”default” column_direction_phone=”default” scene_position=”center” text_color=”dark” text_align=”left” row_border_radius=”none” row_border_radius_applies=”bg” overflow=”visible” overlay_strength=”0.3″ gradient_direction=”left_to_right” shape_divider_position=”bottom” bg_image_animation=”none” gradient_type=”default” shape_type=””][vc_column column_padding=”no-extra-padding” column_padding_tablet=”inherit” column_padding_phone=”inherit” column_padding_position=”all” column_element_direction_desktop=”default” column_element_spacing=”default” desktop_text_alignment=”default” tablet_text_alignment=”default” phone_text_alignment=”default” background_color_opacity=”1″ background_hover_color_opacity=”1″ column_backdrop_filter=”none” column_shadow=”none” column_border_radius=”none” column_link_target=”_self” column_position=”default” gradient_direction=”left_to_right” overlay_strength=”0.3″ width=”1\/1″ tablet_width_inherit=”default” animation_type=”default” bg_image_animation=”none” border_type=”simple” column_border_width=”none” column_border_style=”solid”][vc_column_text]The weight of the battery in electric vehicles requires stronger body structures,<\/strong> including the lower part of the chassis (sill). In electric vehicles, this part has a higher specific mass than in combustion vehicles because of functional and design requirements, including supporting the weight of the battery pack. <\/span><\/p>\n

The frame is usually made of a multilayer structure that is bonded with structural adhesives to increase its strength and durability.<\/strong><\/p>\n

Structural adhesives require specific heating times, typically in the hot paint process, to gain adhesion and mechanical strength.<\/span><\/p>\n

Below we present a case study applied to the world of Mercedes electric vehicles.<\/strong>[\/vc_column_text][divider line_type=”No Line” custom_height=”20″][image_with_animation image_url=”19517″ image_size=”full” animation_type=”entrance” animation=”None” animation_movement_type=”transform_y” hover_animation=”none” alignment=”” border_radius=”20px” box_shadow=”none” image_loading=”default” max_width=”100%” max_width_mobile=”default”][vc_column_text]\n

The challenge<\/h2>\n[\/vc_column_text][vc_column_text]For the next-generation electric vehicles, Mercedes used a multi-layer structure of steel and extruded aluminum adhesively bonded for the chassis.<\/strong> This structure had an insulating effect that adversely affected the adhesive strength and curing properties when applied in body shop and subjected to the processes of e-coating. <\/strong><\/span><\/p>\n

Mercedes turned to DuPont, a<\/strong> longtime supplier of adhesives, to develop a new structural adhesive with a lower cure temperature window.<\/span>[\/vc_column_text][vc_column_text]\n

The solution<\/h2>\n[\/vc_column_text][vc_column_text]DuPont has responded to the challenge with its newest development, the broad-bake adhesive BETAMATE\u2122 1650<\/strong>. More than sixty years of experience in adhesive technology enabled DuPont to be first to market with the new solution quickly.<\/span><\/p>\n

Structural adhesives generally have<\/strong> a curing window between 165\u00b0C and 200\u00b0C. Mercedes requested a wider window with a specification of 150\u00b0C for 15 minutes. BETAMATE\u2122 1650 has been tested and validated to operate between 150\u00b0C and 200\u00b0C, easily meeting the demands of Mercedes.<\/strong><\/span><\/p>\n

These were the other requirements that DuPont had to meet:<\/strong><\/p>\n