Hi, I have made a binder polymer resin for uv curing of ink. The viscosity of binder polymer is between 700 to 1300 cps. Basically I disperse the inorganic pigments in the binder polymer along with UV initiator and HDI as an adhesion promotor. The ink takes long time typically 15-30 minutes to cure on Polypropylene surface.
I am looking for some methods to modify HDI with acrylates or methacrylates to make the curing process faster. which chemical methods are useful to modify HDI for faster UV curing on plastic surface.
Any suggestions will be appreciated, Thanks in advance.
Dear Wajeeh ur Rehman, use of activator/catalyst, and work at high temperature to avoid cyclization. My Regards
https://www.researchgate.net/publication/249075729_Effect_of_the_Activator_Type_and_CatalystActivator_Ratio_on_Physical_and_Mechanical_Properties_of_Cast_PA6
https://doi.org/10.1016/0014-3057(80)90112-3
Abdelkader BOUAZIZ Thank you for the suggestion and recommended articles, certainly helps
Wajeeh, has the binder a polyol function in it ? Also try to match the viscosity of the binder and the HDI.
Emilio Malaguti thank you for your answer, yes the binder has polyols in it. to pad print the pigment ink onto the surface of polypropylene, the suitable viscosity is above 700 cps. Is there a way to increase the viscosity of HDI? I suppose using DBTDL will basically turn it into solid
Try adding N-Butyl-2-(1-ethylpentyl)- 1,3-oxazolidine to the polymer
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