EP1727881A1 - Dispersion aqueuse stable de particules, et utilisation et procede de production de telles particules - Google Patents

Dispersion aqueuse stable de particules, et utilisation et procede de production de telles particules

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Publication number
EP1727881A1
EP1727881A1 EP05729613A EP05729613A EP1727881A1 EP 1727881 A1 EP1727881 A1 EP 1727881A1 EP 05729613 A EP05729613 A EP 05729613A EP 05729613 A EP05729613 A EP 05729613A EP 1727881 A1 EP1727881 A1 EP 1727881A1
Authority
EP
European Patent Office
Prior art keywords
stable aqueous
aqueous dispersion
dispersion according
particles
dispersion
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP05729613A
Other languages
German (de)
English (en)
Inventor
Norman Blank
Urs Mäder
Werner Handl
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Amg Mining AG
Original Assignee
Sika Technology AG
Graphit Kropfmuehl AG
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.)
Filing date
Publication date
Application filed by Sika Technology AG, Graphit Kropfmuehl AG filed Critical Sika Technology AG
Priority to EP05729613A priority Critical patent/EP1727881A1/fr
Publication of EP1727881A1 publication Critical patent/EP1727881A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M173/00—Lubricating compositions containing more than 10% water
    • C10M173/02—Lubricating compositions containing more than 10% water not containing mineral or fatty oils
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
    • C10M2201/04—Elements
    • C10M2201/041—Carbon; Graphite; Carbon black
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
    • C10M2201/06—Metal compounds
    • C10M2201/061—Carbides; Hydrides; Nitrides
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
    • C10M2201/06—Metal compounds
    • C10M2201/062—Oxides; Hydroxides; Carbonates or bicarbonates
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
    • C10M2201/06—Metal compounds
    • C10M2201/065—Sulfides; Selenides; Tellurides
    • C10M2201/066—Molybdenum sulfide
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
    • C10M2201/08—Inorganic acids or salts thereof
    • C10M2201/084—Inorganic acids or salts thereof containing sulfur, selenium or tellurium
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
    • C10M2201/087—Boron oxides, acids or salts
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
    • C10M2201/10—Compounds containing silicon
    • C10M2201/102—Silicates
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
    • C10M2201/10—Compounds containing silicon
    • C10M2201/102—Silicates
    • C10M2201/103—Clays; Mica; Zeolites
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2209/00—Organic macromolecular compounds containing oxygen as ingredients in lubricant compositions
    • C10M2209/02—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • C10M2209/08—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing monomers having an unsaturated radical bound to a carboxyl radical, e.g. acrylate type
    • C10M2209/084—Acrylate; Methacrylate
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2217/00—Organic macromolecular compounds containing nitrogen as ingredients in lubricant compositions
    • C10M2217/02—Macromolecular compounds obtained from nitrogen containing monomers by reactions only involving carbon-to-carbon unsaturated bonds
    • C10M2217/024—Macromolecular compounds obtained from nitrogen containing monomers by reactions only involving carbon-to-carbon unsaturated bonds containing monomers having an unsaturated radical bound to an amido or imido group
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2010/00—Metal present as such or in compounds
    • C10N2010/12—Groups 6 or 16
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2020/00—Specified physical or chemical properties or characteristics, i.e. function, of component of lubricating compositions
    • C10N2020/01—Physico-chemical properties
    • C10N2020/02—Viscosity; Viscosity index
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2040/00—Specified use or application for which the lubricating composition is intended
    • C10N2040/20—Metal working
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2050/00—Form in which the lubricant is applied to the material being lubricated
    • C10N2050/01—Emulsions, colloids, or micelles
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2050/00—Form in which the lubricant is applied to the material being lubricated
    • C10N2050/015—Dispersions of solid lubricants

Definitions

  • the invention relates to stable aqueous dispersions of particles.
  • the invention also relates to the use and production processes of such stable aqueous dispersions of particles.
  • graphite dispersions are used as lubricants and release agents, for example in the hot forming of metals. It is required that such graphite dispersions adhere to cold and hot metal surfaces and form a lubricating and Schulz film. This should not only make the metal easier to deform, but also reduce tool wear during deformation.
  • the graphite dispersions are used as coatings, for example for the inner coating of battery cups or rubber vulcanisates, for example for windshield wipers, but also as conductive coatings on plastics, glass, ceramics and others.
  • the aqueous dispersions primarily require universal processability. For example, depending on the application, such dispersions mostly sprayed on.
  • the viscosity of the aqueous dispersion plays an important role and low-viscosity dispersions are required.
  • Graphite dispersions without additives are extremely highly viscous and sometimes thixotropic. This is due to the platelet-like structure of the graphite particles, which build up a so-called card house structure in liquids.
  • This house of cards structure is also known from other platelet-shaped substances, such as clay minerals or kaolines.
  • peptizing agents this house of cards structure can collapse and the stability can be increased by using electrostatically active substances. Such mechanisms of action with peptizers do not work with graphite.
  • macromolecular substances are additionally used to stabilize graphite dispersions.
  • Such macromolecular substances from the connecting groups of the mono- and polysaccharides act as protective colloids while increasing the viscosity.
  • Polyelectrolytes such as sodium carboxymethyl cellulose, alginates or salts of lignin sulfonic acids also fall under the known spectrum of activity.
  • Schulz colloids there is the problem of breaking up molecular chains, provided that they are added before the grinding.
  • US 5800739 proposes a conductive graphite dispersion which is stabilized with a dispersant which has alkylene oxide groups and has a hydrophilic-lipophilic balance of 12. This balance is commonly known as HLB (Hydrophilic Lipophilic Balance).
  • HLB Hydrophilic Lipophilic Balance
  • Substances are used, such as polyoxyethylene-polyoxypropylene copolymers, sodium salts of organic sulfonic acids, but also water-soluble polymers such as polyvinylpyrrolidone, which is already known from US 2978428.
  • the disadvantage of these dispersions is the rapid sedimentation.
  • US 5476580 proposes a method for producing coating materials based on graphite and / or carbon black.
  • the teaching provides for a combination of water-soluble dispersing and wetting agents.
  • Anionic substances such as alkali polyacrylates, are mentioned as dispersants.
  • Anionic as well as cationic products are also used as wetting agents.
  • the binders comprise practically the entire group of poly- and monosaccharides as well as resins and polymer dispersions.
  • US 4401579 proposes an aqueous dispersion which essentially contains the auxiliaries corresponding to the prior art.
  • the use of fumaric acid and / or its salts is regarded as new. Fumaric acid salts may have a lubricating effect, but they have no effect on improving dispersion stability.
  • All the known processes have the disadvantage that the concentrations produced do not correspond to the use concentrations.
  • the dispersions must be diluted down to the desired application concentrations. The resulting low concentration lowers the effectiveness of the additives to such an extent that dilutions are sedimentation-stable for only a few hours.
  • the object of the present invention is to provide a stable aqueous dispersion of particles, which has a high dispersion stability and can be processed with almost all application methods if possible. According to the invention, this is achieved by the features of the first claim.
  • the advantages of the invention can be seen, inter alia, in the fact that the use of polycarboxylate as stabilizer and dispersant achieves a high storage stability of the aqueous dispersion.
  • the polycarboxylate envelops the particles and, due to the steric stabilization, prevents the particles from approaching each other and thus preventing the formation of agglomerates. This is particularly advantageous since, in the case of disperse systems, the size of the exchange surface and the thickness of the boundary layers are decisive.
  • phase boundary depends hyperbolic on the particle diameter. Very fine-particle dispersions ⁇ 1.0 ⁇ m therefore tend to form agglomerates, so that the theoretical stability advantage, as it results from Stock's law, is offset by the formation of large agglomerate parts. Agglomerates sediment at a comparable rate to primary particles of the same size.
  • the use of polycarboxylates reliably prevents agglomerate formation. By binding the polycarboxylates as stabilizing or dispersing agents on the particle surface, the stabilization takes place through this mechanism. This means that the dispersion remains stable even when diluted, since the stabilization no longer takes place via the viscosity.
  • the present invention relates to a stabilizer or a dispersant from the group of the polycarboxylates for the production of stable aqueous dispersions of particles.
  • Polycarboxylates are comb polymers which consist of a main chain to which carboxylic acid groups are bound as free acids or in the form of their salts, and side chains made of polyalkylene oxide. Such polycarboxylates are known per se, e.g. from EP 1 136 508 A1, EP 1 138 696 A1 and EP 1 138 697 A1 of the applicant. The disclosure of these polycarboxylates is included below.
  • the polyalkylene oxide or polyalkylene glycol side chains can over
  • Ester bond, amide bond or ether bond to the main chain In addition to the carboxylic acid groups and the polyalkylene oxide side chains, further functional or non-functional groups can be attached to the
  • Such comb polymers can be prepared, for example, by copolymerizing unsaturated mono- or di-carboxylic acids with unsaturated carboxylic esters, unsaturated carboxamides, allyl ethers or vinyl ethers.
  • the carboxylic acids in the finished comb polymer can be in the form of their free acid or in whole or in part in the form of their salts.
  • the comb polymers can also be produced by polymer-analogous reactions.
  • Hydroxyl functions contain reacted under conditions that are too partial
  • the polyalkylene glycol of the side chain is based on polymerized epoxy-containing compounds, such as ethylene oxide, propylene oxide, 1-butene oxide, phenylethylene oxide, etc.
  • the polyether side chain thus preferably consists of polyethylene oxide or polypropylene oxide or a mixed copolymer of ethylene oxide and propylene oxide and has a free end a hydroxyl group, a primary amino group or an alkyl group having 1 to 20 carbon atoms, which is linear, branched or cyclic, preferably a linear alkyl group having 1 to 4 carbon atoms.
  • polycarboxylates have a molecular weight of 50,000 to 200,000, preferably 80,000 to 100,000, particularly preferably a molecular weight of 10,000 to 80,000.
  • the cabonic acid salts can be alkali metal or alkaline earth metal salts or salts of other divalent or trivalent metal ions, ammonium ions, organic ammonium groups or mixtures.
  • the polycarboxylate according to the invention consists of four structural units (a, b, c and d) and has the structural formula A
  • M hydrogen, alkali metal ion, alkaline earth metal ion, ZW € trivalent metal ion, ammonium ion, organic ammonium group or a mixture thereof,
  • R each R independently of the other hydrogen or methyl
  • R 3 -NH 2 , -NR 5 R 6 , -OR 7 NR 8 R 9 , where R 5 and R 6 are independently a Ci to C 2 o alkyl, cycloalky-I or alkylaryl or aryl group or a hydroxyalkyl group, such as, for example, hydroxyethyl, hydroxypropyl, hydroxybutyl group, or an acetoxyethyl (CH 3 -CO-O-CH 2 -CH 2 -), hydroxy-isopropyl- (HO-CH (CH 3 ) -CH 2 - ), Acetoxyisopropyl group (CH 3 -CO-O-CH (CH 3 ) -CH 2 -), or R 5 and R 6 together form a ring, of which the nitrogen is part, to form a morpholine or imidazoline ring, where R 7 is a C2-C4 alkylene group and R 8 and R 9 are independently a Ci to C 20 alkyl, where
  • the sequence of building blocks a, b, c, d can be in blocks, alternating or random.
  • Polycarboxylates according to formula A can be imagined to be built up from a main chain of polymerized units of acrylic acid and methacrylic acid or a mixed copolymer thereof.
  • the polyalkylanoxide side chains are bonded to this main chain via ester or amide groups.
  • Carboxylic acid groups or the carboxylic acid salts and the polyalkylene glycol side chains, further groups may be bound via esters or amide bonds, such as, for example, alkyl groups, cycloalkyl groups, aromatics, substituted aromatics, hydroxyalkyl groups, dialkylaminoalkyl groups, or heterocyclic rings in which the N of the amide group is a constituent, such as, for example, morpholine or imidazole.
  • esters or amide bonds such as, for example, alkyl groups, cycloalkyl groups, aromatics, substituted aromatics, hydroxyalkyl groups, dialkylaminoalkyl groups, or heterocyclic rings in which the N of the amide group is a constituent, such as, for example, morpholine or imidazole.
  • groups R 3 which are bonded to the main chain via their N as amides are amine residues which have one or two independent aliphatic, cycloaliphatic or aromatic residues of 1 to 20 carbon atoms, such as methyl, ethyl, propyl, iso- Propyl, - butyl, iso-butyl or cyclohexyl radicals.
  • amine residues are dibutylamine or dicyclohexylamine.
  • Further examples are amine residues with hydroxyalkyl groups such as ethanolamine or diethanolamine.
  • groups R 3 which are bonded to the main chain via their O as an ester are aliphatic, cycloaliphatic or aromatic residues of 1 to 20 carbon atoms, such as, for example, methyl, ethyl, propyl, isopropyl, butyl, iso -Butyl or cyclohexyl residues.
  • Further examples are amino alcohol residues such as methyl diethanolamine, triisopropanolamine, triethanolamine, dibutylaminoethanol, diisopropanolamine, diethylaminoethanol, dimethylaminoethanol.
  • Any substances can be used as particles to be suspended, including graphite, but also metals and alloys,
  • Metal compounds such as metal sulfides, metal oxides but also organic ones
  • Boron nitride, mica, microtalk, hydrotalcite or montmorillonite can be used. These minerals can have a platelet-shaped structure, which consists of individual layer levels and each have different properties in different directions. For example, graphite is electrically a poor conductor perpendicular to the layer plane, but a good conductor in parallel.
  • the structure of the polycarboxylates causes an interaction with the particles / substrate, forms a polymer film and thereby achieves one steric shielding. This not only prevents the agglomerate formation of the particles, but also keeps the particles in suspension.
  • the polycarboxylates according to the invention disperse the particles well in water and that the aqueous dispersions obtained have a low viscosity of 200 to 900 mPas, in particular 300 to 600 mPas. This allows the use of such dispersions in spray applications. This can be done in the classic compressed air spraying process (airspraying) as well as free of compressed air (airless).
  • the dispersions according to the invention can also be used as a lubricant, release agent, coating or coating, it being possible for the dispersion to be applied in addition to spray application, also by dipping processes, using a brush, roller, etc.
  • the dispersions according to the invention also give a perfect surface on the surface to be coated. That it becomes a smooth streak-free surface, no crater formation (orange peel effect), no tear formation, more perfect
  • the polycarboxylates according to the invention result in aqueous dispersions which can be stored for at least more than 4 weeks.
  • the particle size of the particles which can be used in these dispersions is preferably in a size range from 0.05 to 40 ⁇ m, in particular 0.3 to 5.0 ⁇ m.
  • the stabilizer in the dispersion has a proportion / concentration of
  • the proportion / concentration of the particles in the dispersion is preferably 1-40% by weight, in particular 10-30% by weight.
  • polycarboxylates are some examples of polycarboxylates as can be used in slurries, especially mineral slurries.
  • the information relates to structural formula A. Explanation of the designations:
  • PEG1000 polyethylene glycol with an average molecular weight of about 1000
  • PPG600 polypropylene glycol with an average molecular weight of about 600
  • EO / PO (60/40) 2000 block copolymer of ethylene oxide and propylene oxide in a ratio of 60:40 with an average molecular weight of 2000,
  • Mw 28000
  • R 1 CH3-PEG OOO-
  • R 1 mixture of CH3-PEGIOOO- and CH 3 -PEG3000 in a molar ratio of 50:50
  • R 1 CH 3 -PEGIOOO-
  • R H- for structure a and CH - for structure b and c
  • R 1 CH 3 -PEG2000-
  • R 1 CH3-PEGHOO-
  • R 2 n-butyl-PPO600-
  • R 1 mixture on CH3-PEG500 and CH3-PEG3000 'in a molar ratio of 3: 2
  • R 1 mixture of CH 3 -PEG1000- and CH 3 -PEG3000 'in a molar ratio of 50:50
  • the comparative examples describe aqueous dispersion of particles, in particular plate-like minerals, without using the polycarboxylates according to the invention.
  • Comparative Example 2 Graphite Dispersion for the Forging Industry Based on Comparative Example 1, a polyoxyethylene
  • the amount of the polyoxyethylene-polyoxypropylene copolymer is subtracted from the amount of water of 75 kg used in Comparative Example 1.
  • 73 kg of deionized water are placed in a container with a stirrer and 5 kg of sodium silicate are dissolved therein.
  • 2 kg polyoxyethylene-polyoxypropylene copolymer and subsequently kg with stirring for 20 graphite having an average particle size be 5 o microns added 1.5 d.
  • the finished dispersion has a high viscosity of 1020 mPas. Sedimentation of the graphite began after 6 days.
  • Comparative Example 3 Boron Nitride Dispersion Based on Comparative Example 2, instead of the graphite
  • Example 1 Graphite dispersion for the forging industry
  • the polymer A9 is now used as an aqueous
  • Amount of 35% aqueous polymer A9 fed reduced. 73 kg of deionized water are placed in a container with a stirrer and 5 kg of sodium silicate are dissolved therein. Then 2 kg of polymer A9 as a 35% aqueous solution and then 20 kg of graphite with an average particle size d 50 1.5 ⁇ m are added with stirring. This is followed by a passage through an agitator ball mill which is equipped with zirconium oxide balls.
  • the finished dispersion has a viscosity of 550 mPas and is stable in storage for more than 4 weeks. In comparison to Comparative Example 1, the viscosity of Example 1 according to the invention is about 4 times lower and is well suited for spray application. Dispersion stability is also significantly improved with the use of polymer A9.
  • Example 4 Graphite dispersion for screen coating In this example the polymer A2 is used. 62 kg of water and

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Chemistry (AREA)
  • Paints Or Removers (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Emulsifying, Dispersing, Foam-Producing Or Wetting Agents (AREA)

Abstract

L'invention concerne une dispersion aqueuse stable de particules, dispersion dans laquelle les particules en milieu aqueux sont stabilisées par un stabilisant polymère. Le stabilisant est un polycarboxylate.
EP05729613A 2004-03-19 2005-03-18 Dispersion aqueuse stable de particules, et utilisation et procede de production de telles particules Withdrawn EP1727881A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP05729613A EP1727881A1 (fr) 2004-03-19 2005-03-18 Dispersion aqueuse stable de particules, et utilisation et procede de production de telles particules

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP04006670A EP1577372A1 (fr) 2004-03-19 2004-03-19 Dispersion aqueuse stable de particules, son utilisation et son procédé de production
EP05729613A EP1727881A1 (fr) 2004-03-19 2005-03-18 Dispersion aqueuse stable de particules, et utilisation et procede de production de telles particules
PCT/EP2005/051277 WO2005090533A1 (fr) 2004-03-19 2005-03-18 Dispersion aqueuse stable de particules, et utilisation et procede de production de telles particules

Publications (1)

Publication Number Publication Date
EP1727881A1 true EP1727881A1 (fr) 2006-12-06

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EP04006670A Withdrawn EP1577372A1 (fr) 2004-03-19 2004-03-19 Dispersion aqueuse stable de particules, son utilisation et son procédé de production
EP05729613A Withdrawn EP1727881A1 (fr) 2004-03-19 2005-03-18 Dispersion aqueuse stable de particules, et utilisation et procede de production de telles particules

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Country Status (8)

Country Link
US (2) US20070197705A1 (fr)
EP (2) EP1577372A1 (fr)
CN (1) CN101068911B (fr)
AU (1) AU2005223400A1 (fr)
CA (1) CA2559767A1 (fr)
MX (1) MXPA06010462A (fr)
WO (1) WO2005090533A1 (fr)
ZA (1) ZA200607987B (fr)

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US20100152399A1 (en) * 2006-05-02 2010-06-17 Basf Se Copolymers as scale inhibitors
WO2008049872A2 (fr) * 2006-10-27 2008-05-02 Akzo Nobel N.V. Suspension aqueuse comprenant un double hydroxyde stratifié
EP2065350B1 (fr) * 2007-10-29 2011-02-23 Sika Technology AG Agent de dispersion pour systèmes de durcissement hydraulique
KR101270932B1 (ko) * 2010-08-05 2013-06-11 한화케미칼 주식회사 탄소소재를 이용한 고효율 방열도료 조성물
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JP5911153B2 (ja) * 2012-03-26 2016-04-27 協和化学工業株式会社 微細ハイドロタルサイト粒子の製造方法
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US20070197705A1 (en) 2007-08-23
MXPA06010462A (es) 2007-05-04
WO2005090533A1 (fr) 2005-09-29
CN101068911B (zh) 2012-11-07
CN101068911A (zh) 2007-11-07
AU2005223400A1 (en) 2005-09-29
CA2559767A1 (fr) 2005-09-29
EP1577372A1 (fr) 2005-09-21
US20090018246A1 (en) 2009-01-15

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