Material system for use in three dimensional printing

• US 20020016387A1
• Filed: 05/30/2001
• Published: 02/07/2002
• Est. Priority Date: 05/30/2000
• Status: Active Grant

• Current Assignee: Daimler AG (Mercedes-Benz Group AG)
• Original Assignee: DaimlerChrysler AG (Mercedes-Benz Group AG)
• Inventors: Shen, Jialin
• Granted Patent: US 7,049,363 B2
• Time in Patent Office: Days
• US Class Current: 523/201
• CPC Class Codes: B29C 64/153 using layers of powder being selectively joined, e.g. by selective laser sintering or melting
• CPC Class Codes: B33Y 10/00 Processes of additive manufacturing
• CPC Class Codes: B33Y 70/00 Materials specially adapted for additive manufacturing

Abstract

A material system for use in a 3D-printing, which exhibits a higher form stability. The material system contains binder and solvent as well as optional filler materials. The binder is soluble in the solvent, as well as two complementary polyelectrolytes, and/or an initiator for a cross linking reaction of the binder. The advantage of such a mixed material system is comprised in the essentially higher binder force between the individual particles. This enhanced binder force results either from the acid-base linkages, which form between the complementary polyelectrolytes, or from the supplemental networking initiated by the initiators, or from both. Substantially higher binding forces between the individual particles means at the same time a substantially higher shape stability of the 3D-printing product.

Claims

1. Material system for use in 3D-printing comprising binder and solvent as well as optionally filler materials, wherein the binder is soluble in the solvent,

thereby characterized,

that the material system contains two complementary polyelectrolytes and/or an initiator for a crosslinking reaction of the binder.

2. Material system according to claim 1, thereby characterized, that the two complementary polyelectrolytes are contained in two binders or in a binder and in the solvent.

3. Material system according to one of the preceding claims, thereby characterized, that the initiator, preferably a photoinitiator, is contained in the solvent or in the one or both binders.

4. Material system according to one of the preceding claims, thereby characterized, that the filler material is coated with the binder.

5. Material system according to one of the preceding claims, thereby characterized, that material system is residual-ash-poor.

6. Material system according to one of the preceding claims, thereby characterized, that it is flowable in an autoclave.

7. Material system according to one of the preceding claims, thereby characterized, that at least a substantial portion of the filler material and binder is in the form of rounded-off particles.

8. Material system according to claim 7, thereby characterized, that average particle diameter is smaller than approximately 40 μ

m.

9. Material system according to one of the preceding claims, thereby characterized, that filler material is comprised of wax, PS, PMMA or POM.

10. Material system according to one of the preceding claims, thereby characterized, that the filler material is comprised of metal, ceramic or carbide.

11. Material system according to one of the preceding claims, thereby characterized, that the binder is comprised of a water-soluble polymer, preferably of PVP or a copolymer thereof.

12. Material system according to one of the preceding claims, thereby characterized, that the portion of the binder comprises less than 10 weight percent of the material system.