Manufacturing methods for nanomaterial dispersions and products thereof

• US 7,683,098 B2
• Filed: 06/21/2005
• Issued: 03/23/2010
• Est. Priority Date: 09/03/1996
• Status: Expired due to Fees

• Current Assignee: PPG Industries Ohio Incorporated (Nouryon BV)
• Original Assignee: PPG Industries Ohio Incorporated (Nouryon BV)
• Inventors: Yadav, Tapesh
• Primary Examiner(s): ANTHONY, JOSEPH DAVID
• Application Number:
  US11/157,164
• Publication Number:
  US 20060016371A1
• Time in Patent Office: 1,736 Days
• Field of Search: 516/34, 516/78
• US Class Current: 516/34
• CPC Class Codes: B82Y 30/00 Nanotechnology for materials or surface science, e.g. nanocomposites
• CPC Class Codes: C01B 13/145 After-treatment of oxides or hydroxides, e.g. pulverising, drying, decreasing the acidity
• CPC Class Codes: C01G 1/00 Methods of preparing compounds of metals not covered by subclasses C01B, C01C, C01D, or C01F, in general electrolytic production of inorganic compounds C25B1/00
• CPC Class Codes: C01G 19/00 Compounds of tin
• CPC Class Codes: C01G 23/003 Titanates C01G23/001 takes precedence
• CPC Class Codes: C01G 23/005 Alkali titanates
• CPC Class Codes: C01G 23/006 Alkaline earth titanates
• CPC Class Codes: C01G 23/047 Titanium dioxide
• CPC Class Codes: C01G 25/00 Compounds of zirconium
• CPC Class Codes: C01G 25/02 Oxides
• CPC Class Codes: C01G 29/00 Compounds of bismuth
• CPC Class Codes: C01G 3/02 Oxides; Hydroxides
• CPC Class Codes: C01G 41/02 Oxides; Hydroxides
• CPC Class Codes: C01G 45/1221 Manganates or manganites with a manganese oxidation state of Mn(III), Mn(IV) or mixtures thereof
• CPC Class Codes: C01G 49/0018 Mixed oxides or hydroxides, C01G49/0009 takes precedence
• CPC Class Codes: C01G 51/40 Cobaltates
• CPC Class Codes: C01G 9/02 Oxides; Hydroxides
• CPC Class Codes: C01P 2004/62 Submicrometer sized, i.e. from 0.1-1 micrometer
• CPC Class Codes: C01P 2004/64 Nanometer sized, i.e. from 1-100 nanometer
• CPC Class Codes: C01P 2006/22 Rheological behaviour as dispersion, e.g. viscosity, sedimentation stability
• CPC Class Codes: C04B 20/0004 : Microcomposites or nanocomposites, e.g. composite particles obtained by polymerising monomers onto inorganic materials
• CPC Class Codes: C09C 3/00 : Treatment in general of inorganic materials, other than fibrous fillers, to enhance their pigmenting or filling properties
• CPC Class Codes: Y10S 516/922 : Colloid systems having specified particle size, range, or distribution, e.g. bimodal particle distribution
• CPC Class Codes: Y10S 516/924 : Significant dispersive or manipulative operation or step in making or stabilizing colloid system
• CPC Class Codes: Y10S 516/928 : Mixing combined with non-mixing operation or step, successively or simultaneously, e.g. heating, cooling, ph change, ageing, milling
• CPC Class Codes: Y10S 516/929 : Specified combination of agitation steps, e.g. mixing to make subcombination composition followed by homogenization
• CPC Class Codes: Y10S 516/93 : Low shear followed by high shear
• CPC Class Codes: Y10S 516/931 : High shear followed by low shear

Abstract

Methods for manufacturing nanomaterial dispersions, such as nanomaterial concentrates, and related nanotechnology are provided. The nanomaterial concentrates provided can be more cheaply stored and transported compared to non-concentrate nanomaterial forms.

Claims

1. A concentrated dispersion comprising a nanomaterial and a solvent composition;

wherein a Hansen interface match index between the nanomaterial and the solvent composition is less than 50,

wherein the bulk density of the concentrated dispersion is at least three times higher than the bulk density of the nanomaterial in dry form,

wherein the concentrate requires less volume to store and transport over that required for dry nanomaterial,

wherein the nanomaterial loading in the concentrated dispersion is at least 55% by weight, and

wherein the solvent composition has percentage contribution values for Hansen parameters that are selected from one of the following four combinations;

     1) non-polar 33%-49%, polar 11%-29%, and hydrogen bonding 28%-47%;

     2) non-polar 40%-63%, polar 14%-33%, and hydrogen bonding 14%-41%;

     3) non-polar 31%-53%, polar 12%-33%, and hydrogen bonding 27%-43%;

or

     4) non-polar 68%-91%, polar 12%-31%, and hydrogen bonding 9%-28%.

2. The concentrated dispersion of claim 1, wherein the nanomaterial is an oxide.

3. The concentrated dispersion of claim 1, wherein the nanomaterial is a metal.

4. The concentrated dispersion of claim 1, wherein the nanomaterial is a non-oxide.

5. The concentrated dispersion of claim 1, wherein the solvent composition comprises an organic solvent.

6. The concentrated dispersion of claim 1, wherein the solvent composition comprises an inorganic solvent.

7. The concentrated dispersion of claim 1, wherein the nanomaterial loading in the concentrated dispersion is at least 60% by weight.

8. The concentrated dispersion of claim 1, wherein the Hansen interface match index between the nanomaterial and the solvent composition is less than 25.

9. The concentrated dispersion of claim 1, wherein the Hansen interface match index between the nanomaterial and the solvent composition is less than 10.

10. The concentrated dispersion of claim 1, wherein the Hansen interface match index between the nanomaterial and the solvent composition is less than 1.

11. The concentrated dispersion of claim 1, wherein the nanomaterial comprises an oxide, the solvent composition comprises a ketone, and the Hansen interface match index between the nanomaterial and the solvent composition is less than 25.

12. The concentrated dispersion of claim 1, wherein the nanomaterial comprises a multimetal oxide, the solvent composition comprises oxygen, and the Hansen interface match index between the nanomaterial and the solvent composition is less than 10.

13. The concentrated dispersion of claim 1, wherein the nanomaterial comprises tungsten oxide.

15. The concentrated dispersion of claim 13, wherein the solvent composition has percentage contribution values for Hansen parameters of non-polar 33%-49%, polar 11%-29%, and hydrogen bonding 28%-47%.

16. The concentrated dispersion of claim 13, wherein the solvent composition has percentage contribution values for Hansen parameters of non-polar 31%-53%, polar 12%-33%, and hydrogen bonding 27%-43%.

14. A concentrated dispersion consisting essentially of a nanomaterial and a solvent composition;

wherein a Hansen interface match index between the nanomaterial and the solvent composition is less than 50,

wherein the bulk density of the concentrated dispersion is at least three times higher than the bulk density of the nanomaterial in dry form,

wherein the concentrate requires less volume to store and transport over that required for dry nanomaterial,

wherein the nanomaterial loading in the concentrated dispersion is at least 55% by weight, and

wherein the solvent composition has percentage contribution values for Hansen parameters that are selected from one of the following four combinations;

     1) non-polar 33%-49%, polar 11%-29%, and hydrogen bonding 28%-47%;

     2) non-polar 40%-63%, polar 14%-33%, and hydrogen bonding 14%-41%;

     3) non-polar 31%-53%, polar 12%-33%, and hydrogen bonding 27%-43%;

or

     4) non-polar 68%-91%, polar 12%-31%, and hydrogen bonding 9%-28%.