Methods for the printing of materials using hybrid ink formulations
Methods relating to the printing of materials using hybrid ink formulations are generally described.
1. A method, comprising:
passing a formulation through a print head,
extruding the formulation through a nozzle of the print head,
exposing the formulation to UV irradiation as the formulation exits the nozzle to at least partially cure the formulation, wherein exposure to UV irradiation causes the viscosity of the formulation to increase by at least a factor of 2,
flowing compressed gas from a compressed gas source to atomize the formulation as the formulation as, or after, the formulation exits the nozzle,
and
depositing the formulation on a substrate,
wherein the formulation comprises a first component comprising one or more molecules with one or more isocyanate functional groups and a second component comprising one or more molecules with one or more alcohol functional groups and/or one or more molecules with one or more amine functional groups.
2. The method according to claim 1 , wherein the second component is a mixture of one or more molecules with one or more alcohol functional groups and one or more molecules with one or more amine functional groups.
3. The method according to claim 1 , wherein the second component comprises one or more additional components selected from the group consisting of a UV cure package, a photo-latent base catalyst, a chain extender, a thermoplastic additive, an organometallic catalyst, a pigment, an antioxidant, a UV absorber, a UV stabilizer, a flexibilizing component, a moisture scavenger, a surface modification additive, a thermally activated free radical generator, and a rheology additive.
4. The method according to claim 1 , wherein the first component comprises one or more molecules selected from the group consisting of methylene diphenyl diisocyanate, 1,6-hexamethylene diisocyanate, 1-isocyanato-3-isocyanatomethyl-3,5,5-tyimethyl cyclohexane, and/or 4,4′-diisocyanato dicyclohexylmethane.
5. The method according to claim 1 , wherein the first component comprises a prepolymer of one or more molecules selected from the group consisting of methylene diphenyl diisocyanate, 1,6-hexamethylene diisocyanate, 1-isocyanato-3-isocyanatomethyl-3,5,5-tyimethyl cyclohexane, and/or 4,4′-diisocyanato dicyclohexylmethane.