Carbon nanotube thread Z-axis multifunctional stitching

Patent metadata

Field	Value
Publication number	US-10570541-B2
Application number	US-201715636075-A
Country	US
Kind code	B2
Filing date	Jun 28, 2017
Priority date	Jun 28, 2016
Publication date	Feb 25, 2020
Grant date	Feb 25, 2020

Abstract

Carbon nanotube threads are coated with a coating solution such as dimethylformamide (DMF), ethylene glycol (EG), polyethylene glycol (PEG), PEG200 (PEG with an average molecular weight of approximately 200 grams per mole (g/mol)), PEG400 (PEG with an average molecular weight of approximately 400 g/mol), aminopropyl terminated polydimethylsiloxane (DMS 100 cP),polymide, poly(methylhydrosiloxane), polyalkylene glycol, (3-aminopropyl)trimethoxysilane, hydride functional siloxane O resin, platinum (0) -1,3-divinyl-1,1,3,3-tetramethyl-disiloxane, moisture in air, acetic acid, water, poly(dimethylsiloxane) hydroxy terminated, (3-glycidyloxypropyl)-trimethoxysilane or a combination thereof. The coated carbon nanotubes may be used to stitch in a Z-direction into a composite such as a polymer prepreg to strengthen the composite. The stitching may occur using a sewing machine.

First claim

What we claim is:

1. A method for coating a carbon nanotube thread having an initial coefficient of friction, the method comprising:
immersing a carbon nanotube thread in a coating solution to form a coated carbon nanotube thread, the coating solution being selected from the group consisting of DMF, DMS, AMSG, HPM, PAWG, PHGM, AMSG2, PPHAP, PGPMH, and PPA, where:
DMF is dimethylformamide;
DMS is an aminopropyl-terminated polydimethvlsiloxane;
AMSG is a mixture of polvalkvlene glycol, (3-aminopropvl) trimethoxysilane, hydride-functional siloxane O resin, and platinum (0)-1,3-divinyl-1-1,1,3,3-tetramethyl-disiloxane;
HPM is a mixture of hydride-functional siloxane O resin and platinum (0 )-1,3-divinyl-1,1,3,3-tetramethyl-disiloxane;
PAWG is a mixture of polyalkylene glycol, (3-glycidyloxypropyl) trimethoxysilane, acetic acid, and water;
PHPM is a mixture of polyalkylene glycol, hydride-functional siloxane O resin, and platinum (0 )-1,3-divinyl-1,1,3,3-tetramethyl-disiloxane;
PHGM is a mixture of polyalkylene glycol, polv(methylhydrosiloxane), (3-aminopropyl)trimethoxysilane, and platinum (0 )-1,3-divinyl-1,1,3,3-tetramethyl-disiloxane;
AMSG2is a mixture of polyalkylene glycol, (3-glycidyloxypropyl)trimethoxysilane, hydride-functional siloxane O resin, and platinum (0 -1,3-divinyl-1,1,3,3-tetramethyl-disiloxane:
PPHAP is a mixture of polvalkylene glycol, poly(methylhydrosiloxane), (3-glycidyloxypropyl)trimethoxysilane, and platinum (0 )-1,3-divinyl-1,1,3,3-tetramethyl-disiloxane;
PGPMH is a mixture of polyalkylene glycol, (3-glycidyloxypropyl)trimethoxysilane, Hydroxyl-terminated poly(dimethylsiloxane), acetic acid, and water; and
PPA is a mixture of polyalkylene glycol, hydroxyl-terminated poly(dimethylsiloxane), and (3-aminopropyl -trimethoxysilane; and

heating the coated carbon nanotube thread at a temperature from 50° C. to 230° C. to dry the coated carbon nanotube thread, the coated carbon nanotube thread having after drying a final coefficient of friction less than the initial coefficient of friction.

2. The method of claim 1 , further comprising applying a lubricant to the coated carbon nanotube thread after the coated carbon nanotube thread is dry.

3. An article comprising a substrate stitched with a coated carbon nanotube thread in a Z-direction into the substrate, the coated carbon nanotube thread being prepared according to the method of claim 1 .

4. A method for strengthening a composite, the method comprising:
stitching a coated carbon nanotube thread prepared according to the method of claim 1 with a sewing machine in a Z-direction into the composite.

5. The method of claim 4 , further comprising before stitching the coated nanotube thread with the sewing machine:
heating the coated carbon nanotube thread at a temperature from 50° C. to 230° C.;
winding the coated carbon nanotube thread onto a spool; and
loading the spool into the sewing machine.

6. The method of claim 4 , further comprising:
dripping or spraying a solvent onto the carbon nanotube thread while stitching the coated nanotube thread with the sewing machine.

7. The method of claim 6 , wherein the solvent s selected from the group consisting of water, alcohols, and acetone.

8. The method of claim 4 , further comprising:
lubricating the carbon nanotube thread with dry graphite while stitching the coated nanotube thread with the sewing machine.

9. The method of claim 5 , further comprising:
dripping or spraying a solvent onto the carbon nanotube thread while stitching the coated nanotube thread with the sewing machine.

10. The method of claim 9 , wherein the solvent is selected from the group consisting of water, alcohols, and acetone.

11. The method of claim 5 , further comprising:
lubricating the carbon nanotube thread with dry graphite while stitching the coated nanotube thread with the sewing machine.

12. The method of claim 5 , wherein, during the stitching, the coated carbon nanotube thread does not tangle, jam the sewing machine, or miss stitches.

13. The method of claim 4 , wherein the coating solution is selected from the group consisting of DMF, DMS, AMSG, HPM, and PAWG.

14. The method of claim 4 , wherein:
the coating solution is selected from the group consisting of AMSG, HPM, and PAWG; and
the coated carbon nanotube thread has a carbon-nanotube (CNT)/sizing interface comprising interface 1 and interface 2:

15. The method of claim 14 , wherein the coating solution is PAWG.

16. The method of claim 1 , wherein the coating solution is selected from the group consisting of DMF, DMS, AMSG, HPM, and PAWG.

17. The method of claim 1 , wherein:
the coating solution is selected from the group consisting of AMSG, and PAWG; and
the coated carbon nanotube thread has a CNT/sizing interface comprising interface 1 and interface 2:

18. The method of claim 17 , wherein the coating solution is PAWG.

19. The method of claim 2 , wherein the lubricant is selected from the group consisting of siloxanes, polyalkylene glycols, and combinations thereof.

20. The article of claim 3 , wherein the substrate is selected from the group consisting of composite preforms, prepreg plies, dry laminates, carbon-fiber cloths, fiberglass, epoxy matrix composites, polyimides, and ceramic matrix composites.

Assignees

• Univ Of Dayton
• Nanocomp Technologies Inc

Inventors

• Kladitis Paul
• Li Lingchuan
• Rice Brian
• Bai Zongwu
• Gailus David

Classifications

• D06M13/224

  Esters of carboxylic acids; Esters of carbonic acid · CPC title

• D05B43/00

  Spool-pin assemblies incorporated in sewing machines · CPC title

• Y10S977/961

  for textile or fabric treatment · CPC title

• Y10S977/847

  Surface modifications, e.g. functionalization, coating · CPC title

• D06M13/5135

  Unsaturated compounds containing silicon atoms · CPC title