Self-hardening material and process for layerwise formation of models

• US 9,676,143 B2
• Filed: 08/02/2013
• Issued: 06/13/2017
• Est. Priority Date: 08/20/2006
• Status: Active Grant

• Current Assignee: Voxeljet AG
• Original Assignee: Voxeljet AG
• Inventors: Kashani-Shirazi, Kaveh
• Primary Examiner(s): Yi, Stella
• Application Number:
  US13/957,915
• Publication Number:
  US 20130313757A1
• Time in Patent Office: 1,411 Days
• CPC Class Codes: B29C 64/153 using layers of powder being selectively joined, e.g. by selective laser sintering or melting
• CPC Class Codes: B29C 64/165 using a combination of solid and fluid materials, e.g. a powder selectively bound by a liquid binder, catalyst, inhibitor or energy absorber
• CPC Class Codes: B29K 2033/12 Polymers of methacrylic acid esters, e.g. PMMA, i.e. polymethylmethacrylate
• CPC Class Codes: B29K 2105/16 Fillers
• CPC Class Codes: B33Y 10/00 Processes of additive manufacturing
• CPC Class Codes: B33Y 70/10 Composites of different types of material, e.g. mixtures of ceramics and polymers or mixtures of metals and biomaterials

Abstract

The invention relates to a self-hardening material for layerwise construction of three-dimensional components, whereby the material comprises at least one particulate material and a separately applied bonding agent for bonding the particulate material, and has a setting time which is at least several times as long as the application time of a particulate layer.

Claims

1. A process comprising the steps of:

a. applying at least one particulate material in the form of a loose powder; and

b. separately applying a bonding agent over a portion of the at least one particulate material for selectively bonding the at least one particulate material;

wherein a setting time is at least several times as long as an application time of a layer of the at least one particulate material;

wherein the process is a process for layerwise construction of a three-dimensional component in a bed of the loose powder

wherein the process includes a step of hardening a layer of the three-dimensional component after applying at least 20 subsequent layers.

2. The process according to claim 1, wherein the setting time is between 20 and 150 times as long as the application time for a layer of the at least one particulate material.

3. The process according to claim 1, wherein the three-dimensional components demonstrate an uncured setting time of within 72 hours or less.

4. The process according to claim 1, wherein the process includes a step of heating the three-dimensional component for setting the bonding agent.

5. The process according to claim 1, wherein the process includes a step of polymerizing the separately applied bonding agent using UV light, radiation, heat, or reactive activators.

6. The process according to claim 1, wherein a setting of the bonding agent takes place after formation of the three-dimensional component.

9. The process according to claim 1, wherein a material of a layer includes the at least one particulate material and the bonding agent, wherein the material of a layer includes an initiator.

10. The process of claim 1,

wherein the bonding agent is a polyurethane resin or an epoxy resin.

11. The process according to claim 1, wherein the bonding agent releases at least part of the at least one particulate material.

12. The process according to claim 1, wherein the bonding agent contains further ingredients that increase or decrease viscosity and/or surface tension so that printability is improved.

13. The process according to claim 12, wherein the bonding agent includes a solvent;

and the at least one particulate material includes a base material that is soluble in the solvent and a filler material that is insoluble in the solvent.

16. The process according to claim 1, wherein the bonding agent is a printable liquid suitable for applying over the at least one particulate material.

17. The process according to claim 1, wherein the at least one particulate material includes polymethylmethacrylate, polyethylmethyacrylate, ABS, PC-ABS, PA, PBT, a metal, glass, or carbon fiber, and the at least one particulate material is a loose material suitable for applying in a layerwise fashion.

18. The process according to claim 1, wherein the bonding agent includes a polymerizable monomer and the at least one particulate material includes an initiator.

20. The process of claim 1,

wherein a delayer is applied with the bonding material.

21. The process according to claim 20, wherein the delayer delays a polymerization reaction without dampening the polymerization reaction.

24. The process of claim 2, wherein the bonding agent contains at least one component selected from the group consisting of an acrylate, a methacrylate and a sterol.

25. The process of claim 24, wherein the at least one particulate material includes polymethylmethacrylate.

26. The process of claim 25, wherein the three-dimensional component cures at about room temperature.

27. The process of claim 9, wherein the material of a layer includes a delayer, wherein the delayer includes benzochinone.

7. A process comprising the steps of:

a. applying at least one particulate material in the form of a loose powder; and

b. separately applying a bonding agent over a portion of the at least one particulate material for selectively bonding the at least one particulate material;

wherein a setting time is at least several times as long as an application time of a layer of the at least one particulate material;

wherein the process is a process for layerwise construction of a three-dimensional component in a bed of the loose powder; and

wherein the bonding agent contains at least one component selected from the group consisting of an acrylate, a methacrylate and a sterol.

8. A process comprising the steps of:

a. applying at least one particulate material in the form of a loose powder; and

b. separately applying a bonding agent over a portion of the at least one particulate material for selectively bonding the at least one particulate material;

wherein a setting time is at least several times as long as an application time of a layer of the at least one particulate material;

wherein the process is a process for layerwise construction of a three-dimensional component in a bed of the loose powder; and

wherein the at least one particulate material includes polymethylmethacrylate.

14. The process according to claim 8, wherein the process includes a step of hardening a layer of the three-dimensional component after applying at least 20 subsequent layers.

15. The process according to claim 8, wherein the process includes a step of setting the bonding agent after formation of the three-dimensional component.

19. A process comprising the steps of:

applying a first layer of a self-hardening material for printing a three-dimensional component;

applying a second layer of the self-hardening material for printing the three- dimensional component, and

setting the first layer after applying the second layer;

wherein the second layer is applied on top of the first layer while the first layer is not yet hardened, and

wherein the first layer and the second layer shrink by the same amount and at the same time;

the first layer and the second layer each include a layer of a particulate material to which a bonding agent is applied separately;

wherein the particulate material includes polymethylmethacrylate, polyethylmetracrylate, ABS, PC-ABS, PA, PBT, a metal, glass, or carbon fiber, and the particulate material is in the form of a loose powder suitable for applying in a layerwise fashion and forming a powder bed; and

the bonding agent includes a polymerizable monomer and is a printable liquid suitable for applying over the particulate material; and

a setting time of the self-hardening material of the first layer is at least 20 times as long as an application time of the first layer.

22. A process comprising the steps of:

a. applying at least one particulate material in the form of a loose powder; and

b. separately applying a bonding agent over a portion of the at least one particulate material for selectively bonding the at least one particulate material;

wherein a setting time is at least several times as long as an application time of a layer of the at least one particulate material;

wherein the process is a process for layerwise construction of a three-dimensional component in a bed of the loose powder; and

wherein the three-dimensional component is constructed over a build platform having a porous surface.

23. A process comprising the steps of:

a. applying at least one particulate material in the form of a loose powder; and

b. separately applying a bonding agent over a portion of the at least one particulate material for selectively bonding the at least one particulate material;

wherein a setting time is at least several times as long as an application time of a layer of the at least one particulate material;

wherein the process is a process for layerwise construction of a three-dimensional component in a bed of the loose powder; and

the three-dimensional component cures at about room temperature.

28. A method for a layered construction of three-dimensional parts, wherein a particulate material and a binding agent are applied in layers for self-curing of the particulate material, wherein a solidifying reaction is delayed by a suitable selection of a chemical composition of the particulate material and the binding agent and/or of ambient physical conditions such that solidification and shrinkage acts on the layered construction of three-dimensional parts no sooner than after application of 20 layers.