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Web Exclusive | December 2019

Adiprene prepolymers from LANXESS offer new possibilities in 3D printing

LANXESS is offering the next generation of Low Free (LF) isocyanate urethane prepolymers that can be formulated into resins for 3D printing (additive manufacturing). In order to create such resins LANXESS works together with 3D printing companies. Based on Adiprene LF pPDI (para-phenylene diisocyanate) prepolymers, these high performance resins are easy to process and safe for industrial manufacturers as well as for the casual home, office or retail user.

The footwear industry is a key user of 3D printing technology for midsole, upper, and structural components such as heels and toes. Footwear components are designed to require both very soft and more rigid elastomers. The wide flexibility to formulate LF prepolymers into printable resins enables 3D printers to drive toward mass customisation, enabling printing across a wide range of hardness from very soft elastomers for cushioning to the more structural shoe elements.

High flexural strength and a wide range of use-temperatures are important to the performance of these components. Adiprene LF pPDI prepolymers are designed to provide superior resistance to low and high temperatures, excellent toughness, and superior resistance to chemicals and abrasion. With excellent property retention up to six weeks at 150°C, athletic shoes, for example, can be stored in a hot car for long time periods without losses. In addition, footwear components benefit from higher flexural fatigue resistance and cold temperature flex performance down to -20 °C.

LANXESS offers urethane prepolymers for 3D printing with other chemistries, including LF MDI and LF HDI. These elastomers provide unique performance, such as optical clarity, UV and hydrolytic stability for outdoor uses, and the elimination of surface imperfections.

Casual users in desktop 3D printing want simple, easy to use resins that increase their manufacturing productivity.  This means resins must be liquid at room temperature, or have a low melting point (< 40°C), and they must have very low viscosity (< 3000 cP). One-component (1K) resins can be plugged directly into the machine without the need for blending or mixing.

High performance LF pPDI prepolymers can be designed with lower viscosity for easier processing and higher productivity. LF technology enables the chemist to control the reactivity of the ink, enabling the 3D printer the flexibility to custom design the PU systems (1K, 2K or 3K). The gel time can be tailored to increase productivity by enabling users to keep resins stable for days without curing, while allowing cure to happen within seconds of application.

Adiprene LF pPDI prepolymers can be cured at room temperature, or formulated into dual curing systems that use both UV and heat. Printable resins made with LF prepolymers are more stable, providing a better surface finish, and can be designed to require minimal post curing, which further improves productivity.
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