Want to reduce the Hardness of TPU. As TPU comes in a granular form incorporating plasticizer is difficult. What methods can be used to incorporate plasticizer in TPU?
Dear Haresh Bhanushali, various approaches are possible, Sucy as blends, IPNs, and diols and/or diisocyanate with fexible segments. Please check the following documents. My Regards
https://doi.org/10.1016/j.polymertesting.2015.07.011
https://www.researchgate.net/publication/315950146_Plasticized_thermoplastic_polyurethanes_for_dielectric_elastomers_with_improved_electromechanical_actuation_ARTICLE
https://link.springer.com/article/10.1007/s10973-016-5923-7
https://doi.org/10.1177/0095244318784626
Abdelkader BOUAZIZ is there any way to blend plasticizer with TPU granules by which we can retain the plasticizer in the TPU during and after the extrusion process ?
Yes, and the best plasticizer is the one of polymeric type such as PLA, to avoid the migration problem. I think one of the suggested document deals with this option. My Regards
Traditionally, waxes have been used to plasticize TPUs which also comes with blooming problem. Either reactive plasticization or selection of softer molecules as the building block of TPU would give you the target softness.
Hi, you an use scCO2 during extrusion to lower glass temperature and helps to incorporate different additives like rubbers or PEG to match your needs...
Cheers
I would recommend Mesmoll, which are phenyl alkane sulfonates. Two types are sold. They are described in Wikipedia under the link
https://de.wikipedia.org/wiki/(C10%E2%80%93C21)Alkansulfons%C3%A4urephenylester
They are not toxic and of low fugability. They are most often used for PVC but should also work for TPUs. They are easier to introduce in the TPU than oligomeric plasticizers. Perhaps even simple swelling before injection molding is sufficient.
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