High Performance Polyurethane Elastomers Using New Cyclaliphatic Diisocyanate

Satoshi Yamasaki, Goro Kuwamura, Hirokazu Morita, Daisuke Hasegawa, Ken Kojio, Atsushi Takahara
2017 Nihon Reoroji Gakkaishi  
Trans-1,4-bis (isocyanatomethyl) cyclohexane (1,4-H 6 XDI) has been newly developed as a novel cycloaliphatic diisocyanate with a high symmetric chemical structure. The PUEs were prepared with 1,4-H 6 XDI, polyesterpolyol as a long chain polyol and 1,4-butanediol (BD) as a chain extender. As the representative aromatic and aliphatic diisocyanates, 4,4′-diphenylmethane diisocyanate (MDI) and dicyclohexyl methane-4,4′-diisocyanate (H 12 MDI) were also used as the control. As a result, it was
more » ... led that 1,4-H 6 XDI-based PUEs achieved high elasticity such as higher impact resilience, lower compression set, improved heat resistant, and good light stability which was not able to be realized with the existing diisocyanates. The reason is explained that the hard segment chains of the 1,4-H 6 XDI-based PUEs crystallized well with formation of hydrogen bonds in the PUEs due to the symmetric structure of 1,4-H 6 XDI. Thus, the 1,4-H 6 XDI-based PUEs can provide superior properties such as mechanical and thermal properties and excellent light stability compared to existing diisocyanate-based PUEs by rheological evaluation. Key Words: 1,4-Bis (isocyanatomethyl) cyclohexane / Micro-phase separated structure / Polyurethane elastomer / Rheological property hexane (1,3-H 6 XDI) 7) , have been applied as the raw materials. However, polyurethanes based on these aliphatic diisocyanates exhibits inferior elasticity such as resilience, compression set, strength and dynamic performance and heat resistance 1) due to poor cohesive force of resulting hard segment chain. So the new aliphatic diisocyanate which produces good elastic property, heat resistance and light stability has been demanded from not only industrial but academic points of view. We have developed and commercialized a new cycloaliphatic diisocyanate, trans-1,4-bis (isocyanatomethyl) cyclohexane (1,4-H 6 XDI) which is referred to as 1,4-H 6 XDI 8) . It is
doi:10.1678/rheology.45.261 fatcat:5zo3ahzxb5f4rfpwaivqwfwlvy