Materials: New Generation of TPVs for Corner Mold Automotive Seals
DuPont’s advanced silicone additives enable next-generation of ExxonMobil’s Santoprene TPVs with better bonding to EPDM and low COF for easy operation of doors, windows.
A reportedly next-generation of Santoprene TPVs from Houston-based ExxonMobil Chemicals was developed in collaboration with DuPont Transportation & Industrial, Wilmington, Del., for automotive corner mold seals. By replacing traditional organic slip additives with DuPont’s engineered silicone-based additives, the two companies formulated this novel Santoprene TPV platform with improved bonding to EDPM rubber substrates and a lower coefficient of friction (COF) for the easy opening and closing of doors and windows.
The Santoprene TPV B260 family of products also delivers improved flow properties, abrasion resistance and UV light stability, according to the collaborators. Said DuPont marketing manager Christophe Paulo,“Our successful collaboration with ExxonMobil Chemical has achieved much more than cutting-edge TPV products. It has also laid the foundation for future projects that take advantage of the unique attributes of our silicone technologies to solve industry challenges and deliver a better consumer experience.”
The DuPont development team found that synergies between a lower molecular weight silicone polymer and an ultra-high molecular weight silicone polymer delivered the low COF ExxonMobil Chemical was looking for. While delivering better sliding properties than the organic additives, the silicone technology enhanced bonding performance to dense EPDM rubber – a critical factor in overmolding. Further, it enabled higher flow for improved processing ease and throughput, better abrasion resistance to protect against damage from slammed doors and improved UV stability to help prevent cracking and discoloration.
INJECTION MOLDING AT NPE: Molding Exhibits Show Off Cell Integration with Multiple Processes & Operations
If you’re interested in lightweight composites, IML, LSR, multi-shot, inmold assembly, barrier coinjection, micromolding, variotherm molding, foams, energy-saving presses, robots, hot runners, and tooling—they’re all here in force.
A thermoplastic composite technology that emerged just a couple of years ago promises to make dramatic strides within the next two years in automotive mass production of structural components.
Demand for more robust plastics is creating new opportunities for radiation-crosslinked nylons, including nylon 6 and 66, which can serve as cost-effective alternatives to higher-cost, high-heat thermoplastics. Crosslinked nylons have higher heat resistance than their standard counterparts, along with better physical properties and abrasion resistance. Adapted from a paper presented at SPE ANTEC 2012.