3-dimensional printing
The present disclosure is drawn to coalescent inks and material sets for 3D printing. The coalescent ink can include an organic-soluble near-infrared dye having a peak absorption wavelength from 800 nm to 1400 nm. The coalescent ink can also include water and an organic co-solvent.
1. A coalescent ink for 3-dimensional printing, comprising:
an organic-soluble near-infrared dye having a peak absorption wavelength from 800 nm to 1400 nm, wherein the near-infrared dye is selected from the group consisting of aminium dyes, tetraaryldiamine dyes, cyanine dyes, dithiolene dyes, and combinations thereof;
a colorant imparting a visible color to the coalescent ink;
water; and
an organic co-solvent, wherein the coalescent ink does not include a polymeric binder.
2. The coalescent ink of claim 1 , wherein the near-infrared dye is an aminium dye.
3. The coalescent ink of claim 1 , wherein the near-infrared dye does not substantially alter the visible color of the coalescent ink.
4. The coalescent ink of claim 1 , wherein the near-infrared dye has a temperature boosting capacity from about 10° C. to about 30° C. for a polymer with a melting point from about 100° C. to about 350° C.
5. The coalescent ink of claim 1 , wherein the near-infrared dye has a solubility of about 0.5 wt % to about 5 wt % in water.
6. The coalescent ink of claim 1 , wherein the near-infrared dye has a concentration of 0.1 wt % to 25 wt % in the coalescent ink.
7. The coalescent ink of claim 1 , wherein the colorant has a concentration of 1 wt % to 10 wt % in the coalescent ink.
8. The coalescent ink of claim 1 , wherein the coalescent ink imparts a visible color when jetted onto polymer particles and provides a concentration of near-infrared dye of 0.1 wt % to 1.5 wt % with respect to the polymer particles.
9. The coalescent ink of claim 1 , wherein the coalescent ink consists of:
the near-infrared dye;
the colorant; and
a liquid vehicle, wherein the liquid vehicle comprises the water and the organic co-solvent.