Customized Solutions for Molding with Polyurethane
Chem-Trend is the global leader in supplying release agents for the molded flexible, visco-elastic, and high-resiliency (HR) MDI, TDI, and TDI/MDI polyurethane systems for low- to high-density automotive as well as non-automotive foam markets.
There are many differences between TDI and MDI reacted polyurethanes, and those differences must be taken into consideration when developing mold release agent solutions. TDI is more toxic than MDI due to its higher vapor pressure. TDI systems react at higher temperatures than MDI systems and therefore need to be processed at higher temperatures, typically from 60 - 75°C / 140 - 170°F compared to 40 - 65°C /105 - 150°F for MDI foam systems. Both can be used for Polyurethane High Resiliency foams and depending on customer requirements, a mixture of TDI/MDI can be used. Releasing TDI foam from a mold is not merely a question of stickiness, as it is quite tacky in the free-rise state. Demolding any part can be defined as a point of critical performance in any polyurethane manufacturing process especially in a high-resiliency application where every second counts during production.
Customers have high standards for finished part quality. From the release agent perspective, the processing temperature – predominantly the mold temperature – is a key aspect. The higher the temperature is, the faster the reaction rate will be. As polyurethane goes from the liquid to the solid state, the viscosity rises and hence the ability of the foam to flow and disperse throughout the mold decreases. Therefore, the mold release agent must be tuned to the specific customer process to maximize part quality. The mold release agent components must be optimized for each customer’s specific process. For example, the temperature of the mold will impact what components are used in the mold release agent so as to avoid causing surface defects due to the release film becoming too soft.
Chem-Trend mold release agents provide excellent release ease, superior part finish, extremely low buildup, and process compatibility over a wide molding temperature range. Product offerings also include release agents that reduce the noise inside the automobile (anti-squeak), give controlled open or closed surfaces, and provide surfaces for post-molding bondability. To complete a full range of products, Chem-Trend's mold preparation/conditioner paste waxes are available to further increase productivity and reduce downtime.
Our mold release agents for TDI, and TDI/MDI polyurethane systems provide:
- Excellent part release†
- Optimal surface finish quality
- Compatibility with secondary operations
- Lower scrap rates
- Cleaner molds
- Less downtime
- Water-based, no/low VOC emissions, cleaner safer working environments
- Tin-free formulations where required
Chem-Trend also offers a complete line of mold cleaners, sealers and preparation pastes designed to address the needs of virtually any type of polyurethane manufacturing process, including those utilizing TDI, and TDI/MDI polyurethane systems. Our extensive experience gained by working on the shop floor with polyurethane molders around the world for over fifty years has helped us understand and address the problems found in molding with TDI, and TDI/MDI. Let us help you improve your operation’s efficiency and reduce scrap.
For more information about the solutions that we offer for polyurethane molding operations, read our Polyurethane Molding page or contact us directly to speak with one of our polyurethane industry experts.