Method of printing a three-dimensional article
View Patent ↗In one aspect, composite build materials for use with a 3D printing system are described herein. In some embodiments, a composite build material described herein comprises a carrier ink comprising a curable material; and pigment particles dispersed in the carrier ink, wherein the pigment particles comprise mica. In some cases, the carrier ink is present in the composite build material in an amount of about 80-98% by weight, and the curable material comprises one or more species of monomeric and/or oligomeric (meth)acrylates. Additionally, in some instances, the pigment particles are present in the composite build material in an amount of about 2-8% by weight and comprise up to about 85% by weight mica, based on the total weight of the pigment particles. The pigment particles, in some cases, can also comprise TiO 2 and/or Fe 2 O 3 .
1. A method of printing a three-dimensional article comprising:
retaining a composite build material in a fluid state in a container;
selectively applying energy to the composite build material in the container to solidify at least a portion of a first fluid layer of the composite build material, thereby forming a first solidified layer that defines a first cross-section of the article;
raising or lowering the first solidified layer to provide a second fluid layer of the composite build material at a surface of the fluid composite build material in the container; and
selectively applying energy to the composite build material in the container to solidify at least a portion of the second fluid layer of the composite build material, thereby forming a second solidified layer that defines a second cross-section of the article, the first cross-section and the second cross-section being bonded to one another in a z-direction,
wherein the composite build material comprises:
a carrier ink comprising a curable material;
pigment particles dispersed in the carrier ink, the pigment particles comprising mica; and
a colorant dispersed in the carrier ink, the colorant differing from the pigment particles.
2. The method of claim 1 , wherein the carrier ink is present in the composite build material in an amount of 80-98% by weight, based on the total weight of the composite build material.
3. The method of claim 1 , wherein the curable material comprises one or more species of (meth)acrylates.
4. The method of claim 1 , wherein the curable material comprises one or more oligomeric materials.
5. The method of claim 4 , wherein the one or more oligomeric materials comprise a urethane (meth)acrylate.
6. The method of claim 1 , wherein the pigment particles are present in the composite build material in an amount of 2-8% by weight, based on the total weight of the composite build material.
7. The method of claim 1 , wherein the pigment particles have an average diameter of 5-500 μm.
8. The method of claim 1 , wherein the pigment particles comprise up to 85% by weight mica, based on the total weight of the pigment particles.
9. The method of claim 1 , wherein the pigment particles further comprise TiO 2 , Fe 2 O 3 , or both.
10. The method of claim 1 , wherein the method does not comprise painting, coating, or plating an exterior surface of the article with a metal or metal alloy.
11. The method of claim 1 , wherein:
the carrier ink is present in the composite build material in an amount of 85-98% by weight, based on the total weight of the composite build material;
the curable material comprises a mixture of 45-55% by weight of one or more monomeric (meth)acrylates and 45-55% by weight of one or more oligomeric urethane (meth)acrylates, based on the total weight of the curable material;
the pigment particles are present in the composite build material in an amount of 2-8% by weight, based on the total weight of the composite build material;
the pigment particles have an average diameter of 5-500 μm and comprise up to 85% by weight mica, based on the total weight of the pigment particles;
the pigment particles exhibit a gold color;
the colorant is present in the composite build material in an amount of 0.1-2.0% by weight, based on the total weight of the composite build material; and
the colorant exhibits a white color.
12. The method of claim 1 , wherein:
the carrier ink is present in the composite build material in an amount of 85-98% by weight, based on the total weight of the composite build material;
the curable material comprises a mixture of 45-55% by weight of one or more monomeric (meth)acrylates and 45-55% by weight of one or more oligomeric urethane (meth)acrylates, based on the total weight of the curable material;
the pigment particles are present in the composite build material in an amount of 2-8% by weight, based on the total weight of the composite build material;
the pigment particles have an average diameter of 5-500 μm and comprise up to 85% by weight mica, based on the total weight of the pigment particles;
the pigment particles exhibit a white color;
the colorant is present in the composite build material in an amount of 0.005-0.05% by weight, based on the total weight of the composite build material; and
the colorant exhibits a black color.
13. The method of claim 1 , wherein the composite build material further comprises one or more additives selected from the group consisting of photoinitiators, inhibitors, stabilizing agents, sensitizers, and combinations thereof.
14. The method of claim 1 , wherein the composite build material when non-cured exhibits a dynamic viscosity of 400-1000 cP at 30° C.
15. The method of claim 1 , wherein a surface of the composite build material when cured exhibits a metallic finish.