The Effect of NCO Content in Polyurethane Foam for Automotive Instrument Panel

A thermoplastic polyurethane (TPU) series for automotive panels with high durability have been newly synthesized using the reacting process based on polyester polyol (BTG), polycaprolactone triol (PCL), hexamethylene diisocyanate (HDI), isophorone diisocyanate (IPDI), and 1,4-butanediol chain extend...

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Bibliographic Details
Published inInternational journal of precision engineering and manufacturing Vol. 24; no. 8; pp. 1435 - 1441
Main Authors Min, Jin-Gyu, Lim, Won-Bin, Lee, Ju-Hong, Bae, Ji-Hong, Huh, PilHo
Format Journal Article
LanguageEnglish
Published Seoul Korean Society for Precision Engineering 01.08.2023
Springer Nature B.V
Subjects
Butanediol
Engineering
Foaming agents
Hardness
Hexamethylene diisocyanate
Industrial and Production Engineering
Instrument panels
Materials Science
Mechanical properties
Polycaprolactone
Polyurethane foam
Regular Paper
Synthesis
Tensile strength
Urethane thermoplastic elastomers
Automotive panel
Uniform skin-pores
Thermoplastic polyurethane
Molding foam
Open cell structure
NCO index
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Summary:A thermoplastic polyurethane (TPU) series for automotive panels with high durability have been newly synthesized using the reacting process based on polyester polyol (BTG), polycaprolactone triol (PCL), hexamethylene diisocyanate (HDI), isophorone diisocyanate (IPDI), and 1,4-butanediol chain extender as a function of NCO/OH ratio (NCO index). The dependence of varying NCO index of synthesized TPUs on tensile strength and hardness have evaluated. To form PU foams with suitable rigidity and uniform skin-pores, the optimal synthetic process was controlled precisely by the amount of solvent, foaming agent, silicone surfactant, and catalysts content. A considerable NCO index dependence was observed in the range of 0.96 ≤ NCO index ≤ 0.99 at almost same molecular weight. When NCO index of TPU was 0.98, mechanical properties achieved maximum value due to the uniform open cell structure of molding PU foam. With the ratio of NCO/OH increasing, the hardness of PU foam also increased until 0.98 NCO index while the hardness of 0.99 NCO index decreased. The designed TPU with 0.98 NCO could be a promising formulation for molding foams of automotive skin panels and seating.
ISSN:2234-7593
2005-4602
DOI:10.1007/s12541-023-00786-8