Polymer formulations for extrusion of composite CO2 sorbents

Patent metadata

Field	Value
Publication number	US-12121878-B2
Application number	US-202117504336-A
Country	US
Kind code	B2
Filing date	Oct 18, 2021
Priority date	Oct 21, 2020
Publication date	Oct 22, 2024
Grant date	Oct 22, 2024

Abstract

An ink includes a vinyl-terminated polydimethylsiloxane polymer, a polydimethylsiloxane copolymer having a hydride component, wherein a hydride to a vinyl ratio (hydride:vinyl) is in a range of greater than 1:1 to about 4:1, a hydrophobic filler, a crosslinking agent, and a carbon dioxide-binding component. A method includes extruding an ink for forming a three-dimensional (3D) structure, the ink including a vinyl-terminated polydimethylsiloxane polymer, a polydimethylsiloxane copolymer having a hydride component, wherein a hydride to a vinyl ratio (hydride:vinyl) is in a range of greater than 1:1 to about 4:1, a hydrophobic filler, a crosslinking agent, and a carbon dioxide-binding component. The method further includes curing the 3D structure for forming a silicone polymer product having the carbon dioxide-binding component.

First claim

What is claimed is:

1. An ink, comprising:
a vinyl-terminated polydimethylsiloxane polymer;
a polydimethylsiloxane copolymer having a hydride component, wherein a hydride to a vinyl ratio (hydride:vinyl) is in a range of greater than 1:1 to about 4:1;
a hydrophobic filler;
a crosslinking agent; and
a carbon dioxide-binding component.

2. The ink as recited in claim 1 , wherein the vinyl-terminated polydimethylsiloxane polymer has a vinyl content in a range of 0.01 to about 0.10 mole vinyl per kilogram polymer.

3. The ink as recited in claim 1 , wherein the polymethylsiloxane copolymer having a hydride component is selected from the group consisting of: a methylhydrosiloxane-dimethylsiloxane copolymer, trimethylsiloxy and/or hydride-terminated, hydride-terminated polydimethylsiloxane polymer, trimethylsiloxy-terminated polymethylhydrosiloxane polymer, and a combination thereof.

4. The ink as recited in claim 1 , wherein the ink includes a hydride composition having the polydimethylsiloxane copolymer, the hydride composition comprising about 10 mol. % to 70 mol. % methylhydrosiloxane.

5. The ink as recited in claim 1 , wherein the filler includes fumed silica.

6. The ink as recited in claim 5 , wherein the fumed silica has a surface area in a range of about 100 to about 300 m 2 /g.

7. The ink as recited in claim 1 , wherein the filler is present in the ink at about 5 wt. % to about 50 wt. % relative to the total weight of the ink.

8. The ink as recited in claim 1 , further comprising an inhibitor.

9. The ink as recited in claim 1 , further comprising a rheology modifying additive.

10. The ink as recited in claim 1 , wherein the carbon dioxide-binding component is selected from the group consisting of: a carbonate, a metal organic framework, activated carbon, an amine-based sorbent, and a combination thereof.

11. The ink as recited in claim 10 , wherein the carbon dioxide-binding component is in powder form.

12. The ink as recited in claim 10 , wherein the carbon dioxide-binding component is in the form of a plurality of particles having an average diameter in a range of 10 microns to about 500 microns.

13. A product formed by extrusion of the ink as recited in claim 1 , the product comprising
a three-dimensional structure having physical characteristics of formation by extrusion,
wherein the structure is self-supporting,
wherein the structure is comprised of filaments having a diameter in a range of greater than 10 micron to about 10 millimeters,
wherein the structure is configured to absorb CO 2 .

14. A method of using the ink recited in claim 1 , the method comprising:
extruding the ink for forming a three-dimensional (3D) structure; and
curing the 3D structure for forming a silicone polymer product having the carbon dioxide-binding component.

15. The method as recited in claim 14 , wherein the vinyl-terminated polydimethylsiloxane polymer has a vinyl content in a range of 0.01 to about 0.10 mole vinyl per kilogram polymer.

16. The method as recited in claim 14 , wherein the polymethylsiloxane copolymer having a hydride component is selected from the group consisting of: a methylhydrosiloxane-dimethylsiloxane copolymer, trimethylsiloxy and/or hydride-terminated, hydride-terminated polydimethylsiloxane polymer, trimethylsiloxy-terminated polymethylhydrosiloxane polymer, and a combination thereof.

17. The method as recited in claim 14 , wherein the ink includes a hydride composition having the polydimethylsiloxane copolymer, the hydride composition comprising about 10 to 70 mol. % methylhydrosiloxane.

18. The method as recited in claim 14 , wherein the filler includes a fumed silica.

19. The method as recited in claim 14 , wherein the ink further comprises an inhibitor.

20. The method as recited in claim 14 , wherein the ink is extruded by a direct ink writing device.

21. The method as recited in claim 14 , wherein the ink is extruded as a continuous filament to form the structure comprising at least 10 layers prior to curing the structure.

22. The method as recited in claim 14 , wherein the ink is extruded as a thin sheet having a thickness in a range of 25 microns to 500 microns.

Assignees

• L Livermore Nat Security Llc

Inventors

• Knipe Jennifer Marie
• Baker Sarah E
• Hernandez Maira Ceron
• Lenhardt Jeremy M
• Pang Simon Hoching
• Stolaroff Joshuah K
• Worthington Matthew A

Classifications

• B33Y10/00

  Processes of additive manufacturing · CPC title

• B29K2509/02

  Ceramics · CPC title

• B29K2083/00

  Use of polymers having silicon, with or without sulfur, nitrogen, oxygen, or carbon only, in the main chain, as moulding material · CPC title

• B01J2220/46

  Materials comprising a mixture of inorganic and organic materials (materials coated or impregnated on a carrier B01J20/32) · CPC title

• C08L2205/02

  containing two or more polymers of the same C08L -group · CPC title