Shelf-stable build materials for 3D printing
Build materials for 3D printing applications are described herein which, in some embodiments, comprise monomeric species operable for producing articles with high T g and/or high heat deflection temperature while maintaining shelf stability. In one aspect, a polymerizable liquid comprises at least 20 weight percent isocyanurate polyacrylate; a photoinitiator component; and a crystallization inhibitor component comprising monomeric curable material, oligomeric curable material or mixtures thereof, wherein the polymerizable liquid does not exhibit crystallization over a period of 28 days at a storage temperature of 5-10° C.
1. A method of printing a three-dimensional article comprising:
providing a polymerizable liquid comprising:
at least 20 weight percent isocyanurate polyacrylate, based on total weight of the polymerizable liquid;
a photoinitiator component; and
a crystallization inhibitor component comprising monomeric curable material, wherein the monomeric curable material comprises a heterocycle, and wherein the polymerizable liquid does not exhibit crystallization over a period of 28 days at a storage temperature of 5-10° C.; and
curing the polymerizable liquid with light to form the article, the article having a post-light curing heat deflection temperature of at least 100° C. according to ASTM D648 at a stress of 1.82 MPa.
2. The method of claim 1 , wherein the post-light curing heat deflection temperature is at least 140° C.
3. The method of claim 1 , wherein the post-light curing heat deflection temperature is at least 200° C.
4. The method of claim 1 , wherein the post-light curing heat deflection temperature is at least 250° C.
5. The method of claim 1 , wherein the post-light curing heat deflection temperature is at least 300° C.
6. The method of claim 1 , wherein the polymerizable liquid is provided in a layer-by-layer process.
7. The method of claim 1 , wherein the article has a storage modulus greater than 1500 MPa at 200° C.
8. The method of claim 1 , wherein the isocyanurate polyacrylate is present in an amount of 30-60 weight percent.
9. The method of claim 1 , wherein the heterocycle has two or more unsaturated substituents.
10. The method of claim 9 , wherein the heterocycle is a polyallylated heterocycle.
11. The method of claim 10 , wherein the polyallylated heterocycle comprises polyallyl isocyanurate.
12. The method of claim 11 , wherein a ratio of the isocyanurate polyacrylate to the polyallyl isocyanurate is 1:4 to 4:1.
13. The method of claim 11 , wherein the polyallyl isocyanurate is present in an amount of 10-30 weight percent based on total weight of the polymerizable liquid.