WO2012120461A1 - Method of producing stable liquid dispersions of powder compounds in an aqueous medium - Google Patents

Method of producing stable liquid dispersions of powder compounds in an aqueous medium Download PDF

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Publication number
WO2012120461A1
WO2012120461A1 PCT/IB2012/051070 IB2012051070W WO2012120461A1 WO 2012120461 A1 WO2012120461 A1 WO 2012120461A1 IB 2012051070 W IB2012051070 W IB 2012051070W WO 2012120461 A1 WO2012120461 A1 WO 2012120461A1
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WO
WIPO (PCT)
Prior art keywords
aqueous medium
dispersions
colloidal system
dispersion
producing
Prior art date
Application number
PCT/IB2012/051070
Other languages
French (fr)
Inventor
Salvatore Cotugno
Paolo FIORENZA
Original Assignee
Bridgestone Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Bridgestone Corporation filed Critical Bridgestone Corporation
Publication of WO2012120461A1 publication Critical patent/WO2012120461A1/en

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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/02—Emulsion paints including aerosols
    • C09D5/024—Emulsion paints including aerosols characterised by the additives
    • C09D5/027—Dispersing agents
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
    • C04B40/0028—Aspects relating to the mixing step of the mortar preparation
    • C04B40/0039—Premixtures of ingredients
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D1/00—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/02—Emulsion paints including aerosols
    • C09D5/024—Emulsion paints including aerosols characterised by the additives
    • C09D5/028—Pigments; Filters
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/45—Anti-settling agents
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/60—Additives non-macromolecular
    • C09D7/61—Additives non-macromolecular inorganic
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/70—Additives characterised by shape, e.g. fibres, flakes or microspheres

Definitions

  • the present invention relates to a method of producing stable liquid dispersions of powder compounds in an aqueous medium.
  • silicates such as clay, mica and kaolin
  • some ingredients e.g. silicates such as clay, mica and kaolin, tend to cluster and/or precipitate, which prevents them from being dispersed evenly.
  • a method of producing liquid dispersions of a powder compound in an aqueous medium characterized in 5 that 1 to 50% w/v of said powder compound is dispersed in a colloidal system of nanometric particles designed to form a liquid dispersion.
  • the colloidal system is preferably made of nanometric particles of inorganic oxide.
  • the nanometric particles * of inorganic oxide preferably comprise large -surface -area silica.
  • the colloidal system preferably comprises 1 to 50% w/v, and more preferably 20 to 40% w/v, of said large- surface-area silica.
  • the powder compound is preferably in the group comprising kaolin, feldspar, mica, silica, alumina, bentonite, and clay.
  • the colloidal system is preferably made of nanometric particles of organic material.
  • the nanometric particles of inorganic material preferably comprise carbon nanotubes.
  • the powder compound is preferably carbon black.
  • a further object of the present invention is a dispersion produced using the above method.
  • Yet a further object of the present invention is a solid material obtained from the dispersion produced using the above method.
  • a - E Five dispersions (A - E) were produced : a control dispersion (A) not containing the colloidal system; and four dispersions (B - E) in accordance with the invention and containing varying amounts of clay.
  • the dispersions were produced by weighing the powdered clay in a process beaker, and adding 50 ml of water for the control dispersion (A) , or 50 ml of the 30% w/v water-silica colloidal system for the invention dispersions (B - E) . The resulting solutions were then mixed in a rotary magnetic mixer (for 10 minutes) and subsequently ultrasound mixed (for 15 minutes) .
  • Table I shows the dispersion compositions and, for each dispersion, the presence of visible precipitate 24h after the dispersion is produced; and the respective separation index, which indicates, 24h after the dispersion is produced, separation of a first phase composed solely of the colloidal system, and a second phase composed of the colloidal system and clay. More specifically, the separation index is calculated as h s /h tot xl00 , where h s is the height of the colloidal system and clay, and h tot is the total height (first and second phase) in the process beaker. Obviously, no separation index is shown for control dispersion (A) , as this contains no colloidal system.
  • the colloidal system employed is marketed by Grace Division under the trade name LUDOX SM-30, and comprises 30% w/v in water of silica with a surface area of 330 m 2 /g and 7 nm particle size.
  • Figures la and lb show SEM analysis images of solid materials obtained by evaporating water from dispersions A and E respectively.

Abstract

A method of producing stable dispersions of a powder compound in an aqueous medium, wherein the aqueous medium comprises a colloidal system of nanometric particles by which to disperse the powder compound.

Description

METHOD OF PRODUCING STABLE LIQUID DISPERSIONS OF POWDER COMPOUNDS IN AN AQUEOUS MEDIUM
TECHNICAL FIELD
The present invention relates to a method of producing stable liquid dispersions of powder compounds in an aqueous medium.
BACKGROUND ART
To do what they are designed for, dispersions must be highly stable, and the ingredients dispersed correctly.
Following restrictions governing the use of organic solvents (such as European Directive 1999/13/CE) , the tendency in industry is increasingly towards aqueous dispersions,- which provide for uniform dispersion of the ingredients without recourse to organic solvents .
When added to aqueous dispersions, some ingredients, e.g. silicates such as clay, mica and kaolin, tend to cluster and/or precipitate, which prevents them from being dispersed evenly.
In the known art, the problem is solved using surfactants as dispersers, but this often has the effect of impairing the ultimate effectiveness of the aqueous dispersion.
An alternative method is therefore needed, by which to produce liquid dispersions in an aqueous medium involving no clustering or precipitation phenomena. DISCLOSURE OF INVENTION
According to the present invention, there is provided a method of producing liquid dispersions of a powder compound in an aqueous medium, characterized in 5 that 1 to 50% w/v of said powder compound is dispersed in a colloidal system of nanometric particles designed to form a liquid dispersion.
The colloidal system is preferably made of nanometric particles of inorganic oxide.
L0 The nanometric particles* of inorganic oxide preferably comprise large -surface -area silica.
The colloidal system preferably comprises 1 to 50% w/v, and more preferably 20 to 40% w/v, of said large- surface-area silica.
L5 The powder compound is preferably in the group comprising kaolin, feldspar, mica, silica, alumina, bentonite, and clay.
Alternatively, the colloidal system is preferably made of nanometric particles of organic material.
20 The nanometric particles of inorganic material preferably comprise carbon nanotubes.
The powder compound is preferably carbon black.
A further object of the present invention is a dispersion produced using the above method.
5 Yet a further object of the present invention is a solid material obtained from the dispersion produced using the above method. BRIEF DESCRIPTION OF THE DRAWINGS
A number of non- limiting embodiments of the invention will be described by way of example with reference to the attached Figures (la and lb) , which show two SEM analysis images of dried materials from two different dispersions.
BEST MODE FOR CARRYING OUT THE INVENTION EXAMPLES
Five dispersions (A - E) were produced : a control dispersion (A) not containing the colloidal system; and four dispersions (B - E) in accordance with the invention and containing varying amounts of clay.
The dispersions were produced by weighing the powdered clay in a process beaker, and adding 50 ml of water for the control dispersion (A) , or 50 ml of the 30% w/v water-silica colloidal system for the invention dispersions (B - E) . The resulting solutions were then mixed in a rotary magnetic mixer (for 10 minutes) and subsequently ultrasound mixed (for 15 minutes) .
Table I shows the dispersion compositions and, for each dispersion, the presence of visible precipitate 24h after the dispersion is produced; and the respective separation index, which indicates, 24h after the dispersion is produced, separation of a first phase composed solely of the colloidal system, and a second phase composed of the colloidal system and clay. More specifically, the separation index is calculated as hs/htotxl00 , where hs is the height of the colloidal system and clay, and htot is the total height (first and second phase) in the process beaker. Obviously, no separation index is shown for control dispersion (A) , as this contains no colloidal system.
TABLE I
Figure imgf000006_0001
The colloidal system employed is marketed by Grace Division under the trade name LUDOX SM-30, and comprises 30% w/v in water of silica with a surface area of 330 m2/g and 7 nm particle size.
Tests show that using more than 50% w/v of disperse powder (in this case, clay) produces pasty dispersions not within the scope of the present invention.
As shown in Table I, only the dispersions with the colloidal system as the aqueous medium show no clay precipitation .
Figures la and lb show SEM analysis images of solid materials obtained by evaporating water from dispersions A and E respectively.
As shown clearly by comparison of the two images, whereas the layer of material from dispersion A (Figure la) shows obvious signs of cluster formation, the layer from dispersion E (Figure lb) shows a highly uniform- density particle arrangement, thus confirming the different extent to which the powder compound is dispersed in the two dispersions.
The data gathered clearly shows the effect of a colloidal state in the aqueous medium in ensuring long- term stability of liquid dispersions of powder compounds; and how the method according to the invention provides for obtaining materials with a highly uniform- density particle arrangement, with all the practical advantages this affords. .

Claims

1. A method of producing liquid dispersions of a powder compound in an aqueous medium, characterized in that 1 to 50% w/v of said powder compound is dispersed in a colloidal system of nanometric particles designed to form a liquid dispersion.
2. A method of producing dispersions in an aqueous medium, as claimed in Claim 1, characterized in that said colloidal system is made of nanometric particles of inorganic oxide.
3. A method of producing dispersions in an aqueous medium, as claimed in Claim 2, characterized in that said nanometric particles of inorganic oxide comprise large- surface-area silica.
4. A method of producing dispersions in an aqueous medium, as claimed in Claim 3, characterized in that the colloidal system comprises 1 to 50% w/v of said large- surface-area silica.
5. A method of producing dispersions in an aqueous medium, as claimed in Claim 4, characterized in that the colloidal system comprises 20 to 40 % w/v of said large- surface-area silica.
6. A method of producing dispersions in an aqueous medium, as claimed in any of the foregoing Claims, characterized in that said powder compound is in the group comprising kaolin, feldspar, mica, silica, alumina, bentonite, and clay.
7. A method of producing dispersions in an aqueous medium, as claimed in Claim 1, characterized in that said colloidal system is made of nanometric particles of organic material.
8. A method of producing dispersions in an aqueous medium, as claimed in Claim 7, characterized in that said nanometric particles of inorganic material comprise carbon nanotubes.
9. A method of producing dispersions in an aqueous medium, as claimed in Claim 8, characterized in that said powder compound is carbon black.
10. A dispersion in an aqueous medium, characterized by being produced using the method as claimed in any of the foregoing Claims.
11. A solid material obtained from a dispersion as claimed in Claim 10.
PCT/IB2012/051070 2011-03-07 2012-03-07 Method of producing stable liquid dispersions of powder compounds in an aqueous medium WO2012120461A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT000201A ITTO20110201A1 (en) 2011-03-07 2011-03-07 METHOD FOR THE PREPARATION OF STABLE DISPERSIONS IN THE AQUEOUS PHASE OF POWDERED COMPOUNDS
ITTO2011A000201 2011-03-07

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014052757A1 (en) * 2012-09-28 2014-04-03 Halliburton Energy Services, Inc. Cement compositions comprising deagglomerated inorganic nanotubes and associated methods

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1348677A2 (en) * 2002-03-21 2003-10-01 Halliburton Energy Services, Inc. Storable water-silica suspensions for use in well cements
US20050051057A1 (en) * 2003-09-09 2005-03-10 Evans Timothy O. Thermal protective coating for ceramic surfaces
WO2006079098A1 (en) * 2005-01-24 2006-07-27 Lubrizol Advanced Materials, Inc. Aqueous dispersions of nanoparticle/polyurethane composites
WO2009099640A1 (en) * 2008-02-08 2009-08-13 Northwestern University Highly-dispersed carbon nanotube-reinforced cement-based materials
CN101531854A (en) * 2009-04-13 2009-09-16 江门市威其五金化工实业有限公司 Nanometer glass heat-insulating film and manufacturing method thereof

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CN101328389A (en) * 2008-07-25 2008-12-24 魏大勇 Nanometer grade environment-friendly type color aqueous waterproof coating material

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1348677A2 (en) * 2002-03-21 2003-10-01 Halliburton Energy Services, Inc. Storable water-silica suspensions for use in well cements
US20050051057A1 (en) * 2003-09-09 2005-03-10 Evans Timothy O. Thermal protective coating for ceramic surfaces
WO2006079098A1 (en) * 2005-01-24 2006-07-27 Lubrizol Advanced Materials, Inc. Aqueous dispersions of nanoparticle/polyurethane composites
WO2009099640A1 (en) * 2008-02-08 2009-08-13 Northwestern University Highly-dispersed carbon nanotube-reinforced cement-based materials
CN101531854A (en) * 2009-04-13 2009-09-16 江门市威其五金化工实业有限公司 Nanometer glass heat-insulating film and manufacturing method thereof

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Week 200974, Derwent World Patents Index; AN 2009-P08388, XP002676290 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014052757A1 (en) * 2012-09-28 2014-04-03 Halliburton Energy Services, Inc. Cement compositions comprising deagglomerated inorganic nanotubes and associated methods

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