WO2011024800A1 - 炭素フィラー用分散剤 - Google Patents
炭素フィラー用分散剤 Download PDFInfo
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- WO2011024800A1 WO2011024800A1 PCT/JP2010/064265 JP2010064265W WO2011024800A1 WO 2011024800 A1 WO2011024800 A1 WO 2011024800A1 JP 2010064265 W JP2010064265 W JP 2010064265W WO 2011024800 A1 WO2011024800 A1 WO 2011024800A1
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- WIPO (PCT)
- Prior art keywords
- carbon
- carbon filler
- chitosan
- dispersant
- filler
- Prior art date
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- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
- H01M4/583—Carbonaceous material, e.g. graphite-intercalation compounds or CFx
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/13—Energy storage using capacitors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
- Y10T428/2913—Rod, strand, filament or fiber
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31678—Of metal
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31971—Of carbohydrate
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31971—Of carbohydrate
- Y10T428/31975—Of cellulosic next to another carbohydrate
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
- Y10T442/20—Coated or impregnated woven, knit, or nonwoven fabric which is not [a] associated with another preformed layer or fiber layer or, [b] with respect to woven and knit, characterized, respectively, by a particular or differential weave or knit, wherein the coating or impregnation is neither a foamed material nor a free metal or alloy layer
Definitions
- the present invention relates to a carbon filler dispersant for dispersing a carbon filler in a liquid medium composed of an aqueous solvent or a non-aqueous solvent. More specifically, a carbon filler-containing composite material in which carbon filler is uniformly dispersed in a solution, which is useful as various coating liquids applied in industrial fields such as paints, inks, coating agents, magnetic materials, ceramics, and power storage devices.
- An object of the present invention is to provide a carbon filler dispersant that is effective in providing the above.
- Carbon fillers are used as colored pigments for plastics, fibers, paints, etc., mainly for use as fillers for rubber products.
- ITO films transparent electrodes
- FPD flat panel displays
- their application has been studied in various fields. Yes.
- Carbon filler is generally a material with small primary particles and strong cohesion, and is therefore a material that is difficult to uniformly disperse, and there is a demand for a dispersant that enables more uniform dispersion.
- the dispersion in an aqueous solvent containing water or a hydrophilic organic solvent has a low surface energy, poor wettability with respect to the aqueous solvent, and uniform dispersion is difficult because the carbon filler surface is lipophilic.
- the slurry solvent (dispersion medium) is a non-aqueous system that is excellent in the uniform dispersibility of the carbon filler, exhibits high adhesion, and is easy to dry.
- Solvents (dispersion media) of (organic solvent system) are overwhelmingly advantageous. For this reason, actually, non-aqueous solvents have been widely used (see Non-Patent Documents 1 and 2, etc.).
- Non-aqueous organic solvents are not only volatile and have a large impact on the environment, but also have to be considered for genotoxicity. It is desirable.
- awareness of environmental protection and prevention of health damage has increased in many industrial fields (Non-patent Document 3), and VOC reduction, non-use of non-aqueous organic solvents having the above-mentioned problems has been increased.
- Countermeasures for solventization and the like are required, and conversion to products that are friendly to the environment and people is required (Non-Patent Document 4).
- Patent Document 1 Attempts to use (Patent Document 1) and attempts to use a compound having a basic functional group in a battery composition containing a conductive additive (Patent Document 2) have been proposed.
- carbon black can be obtained by performing gas phase oxidation treatment such as ozone treatment and plasma treatment, or by performing liquid phase oxidation treatment using hydrogen peroxide water, sodium perchlorate, etc.
- gas phase oxidation treatment such as ozone treatment and plasma treatment
- liquid phase oxidation treatment using hydrogen peroxide water, sodium perchlorate, etc.
- a hydrophilic functional group such as a carboxyl group or a hydroxyl group is introduced on the surface of the surface to increase the surface acidity (Patent Documents 3 and 4).
- the dispersion medium used in these proposals is mainly used for organic solvents, and there are very few examples using an aqueous system.
- carbon black introduced with a hydrophilic functional group by surface treatment has increased wettability with aqueous solvents and improved water dispersibility, but the introduced hydrophilic functional group becomes an impediment to conductivity.
- there are restrictions such as being unsuitable for use for the purpose of conductivity. Therefore, even if it is used, there is a strong demand for the appearance of a method in which the amount of non-aqueous organic solvent is small, environmentally friendly, inexpensive and highly safe aqueous slurry, and the carbon filler is uniformly dispersed. ing.
- Dispersants used in water-based slurries include polycarboxylates and phosphate amine salts used in the paint field, and polyacrylamides as polymer dispersants. In consideration, environmentally friendly natural products are preferred.
- Patent Document 4 a proposal (Patent Document 4) using carboxymethyl cellulose as an aqueous dispersant has been made at the time of manufacturing a non-aqueous electrolyte secondary battery electrode, but there is still room for improvement in the dispersion effect.
- the present invention has been made in view of the above circumstances, and an object of the present invention is an environmentally friendly natural product-based substance that can solve the above-described problems of the prior art, but in a liquid medium, particularly an aqueous system.
- An object of the present invention is to provide a new dispersant that gives good dispersibility to a carbon filler in a solvent and also functions as a binder for the carbon filler.
- the object of the present invention is to uniformly disperse the carbon filler that can be used in various fields such as paint, ink, toner, rubber / plastic, ceramic, magnetic material, adhesive, battery, electronic material, liquid crystal color filter.
- the present invention is a dispersant for dispersing a carbon filler in a liquid medium comprising an aqueous solvent or a non-aqueous solvent, and comprising a hydroxyalkyl chitosan as a main component.
- a dispersant for dispersing a carbon filler in a liquid medium comprising an aqueous solvent or a non-aqueous solvent, and comprising a hydroxyalkyl chitosan as a main component.
- the hydroxyalkyl chitosan is at least one selected from the group consisting of glycerylated chitosan, hydroxyethyl chitosan, hydroxypropyl chitosan, hydroxybutyl chitosan and hydroxybutylhydroxypropyl chitosan.
- the weight average molecular weight of the hydroxyalkyl chitosan is 2,000-350,000.
- the hydroxyalkyl degree of hydroxyalkyl chitosan is 0.5 or more and 4 or less.
- an organic acid or a derivative thereof is included as an additive, and the amount of the organic acid added is 0.2 to 3 parts by mass per 1 part by mass of the hydroxyalkyl chitosan.
- the carbon filler is selected from the group consisting of carbon black, acetylene black, ketjen black, furnace black, natural graphite, artificial graphite, amorphous carbon, hard carbon, soft carbon, activated carbon, carbon nanofiber, carbon nanotube, fullerene Must be at least one.
- a new dispersant that gives good dispersibility to a carbon filler in a liquid medium, particularly an aqueous solvent, while being a natural product-based substance.
- carbon fillers that can be used in various fields such as paints, inks, toners, rubber / plastics, ceramics, magnetic materials, adhesives, batteries, electronic materials, and liquid crystal color filters are uniformly dispersed.
- a slurry is obtained in which the carbon filler is uniformly dispersed in the liquid medium by the dispersant of the present invention, whereby the carbon filler having high dispersibility and dispersion stability is dispersed. It becomes possible to realize a coating liquid. Further, since this substance functions as a dispersant and at the same time is a carbon filler binder or a natural polymer having a film-forming ability, the coating treatment should be performed using a coating liquid containing the dispersant. This makes it possible to form a carbon filler-containing composite material in which carbon fillers are effectively dispersed. In this composite material, since the carbon filler is uniformly dispersed, the functionality of the carbon filler is sufficiently exhibited.
- a coating liquid in which a carbon filler using the dispersant of the present invention is uniformly dispersed to various objects to be coated such as a metal, a resin, a ceramic, and a power storage device current collector, A conductive composite material having excellent performance in which the conductivity of the carbon filler is effectively expressed can be obtained.
- a hydroxyalkyl chitosan which is a natural product-derived substance, is a natural polymer having a film-forming ability, but is composed of an aqueous solvent or a non-aqueous solvent. It has been found that a medium, particularly an aqueous solvent, exhibits a high dispersion function with respect to a carbon filler, and has led to the present invention.
- the dispersant of the present invention is a dispersant for dispersing a carbon filler in a liquid medium composed of an aqueous solvent or a non-aqueous solvent, and is characterized by having a hydroxyalkyl chitosan as a main component.
- the dispersant of the present invention is particularly useful for dispersing a carbon filler in water or an aqueous mixed medium of water and an organic solvent miscible with water.
- the main component that exhibits the effect of dispersing the carbon filler is hydroxyalkyl chitosan, which is a natural polymer with a low environmental load.
- At least one selected from the group consisting of glycerylated chitosan, hydroxyethyl chitosan, hydroxypropyl chitosan, hydroxybutyl chitosan and hydroxybutylhydroxypropyl chitosan is particularly preferable.
- the hydroxyalkyl chitosan that characterizes the present invention has a structure in which alkylene oxide or oxirane methanol is added to the amino group of chitosan, and is preferably produced by reacting chitosan with alkylene oxide or oxirane methanol.
- the hydroxyalkyl chitosan used by this invention is not limited to this, The hydroxyalkyl chitosan manufactured by the other method can be used similarly.
- said alkylene oxide and oxirane methanol may be used independently, and may be used in mixture of multiple types.
- hydroxyalkylchitosan used in the present invention When producing hydroxyalkylchitosan used in the present invention by reacting chitosan and alkylene oxide, chitosan is stirred and dispersed in, for example, hydrous isopropyl alcohol, and sodium hydroxide and butylene oxide are added thereto. Then, hydroxybutylchitosan can be obtained by heating and stirring.
- glycerylated chitosan used in the present invention by reacting chitosan with oxirane methanol, for example, chitosan is stirred and dispersed in hydrous isopropyl alcohol, and oxirane methanol is added thereto. Then, glycerylated chitosan can be obtained by heating and stirring.
- hydroxyalkyl chitosan As the hydroxyalkyl chitosan used in the present invention, hydroxyalkyl chitosan having a hydroxyalkylation degree in the range of 0.5 or more and 4 or less is preferably used from the viewpoint of dispersibility of the carbon filler.
- degree of hydroxyalkylation (no unit) refers to the rate of addition of alkylene oxide or oxirane methanol to chitosan. That is, in this invention, it is preferable that it is 0.5 mol or more and 4 mol or less per one pyranose ring (1 mol) which comprises chitosan.
- hydroxyalkylation degree of the hydroxyalkylchitosan used is less than 0.5, it is insufficient in terms of carbon filler dispersibility and slurry stability after dispersion, while the hydroxyalkylation degree exceeds 4 However, since the carbon filler dispersibility does not change, it is uneconomical to increase the hydroxyalkylation degree.
- a weight average molecular weight of less than 2,000 is not preferable because it is insufficient in terms of dispersibility of the carbon filler.
- the weight average molecular weight exceeds 350,000 the viscosity of the dispersant increases, and when a dispersion such as a slurry is prepared using this, it is difficult to increase the solid content concentration of the carbon filler in the dispersion. Therefore, it is not preferable.
- the dispersant of the present invention is mainly composed of the hydroxyalkyl chitosan as described above, and an organic acid or a derivative thereof may be further added thereto.
- an organic acid or a derivative thereof is added for the purpose of increasing the solubility in a liquid medium. It is preferable.
- the amount of the organic acid added may be 0.2 to 3 parts by mass per 1 part by mass of hydroxyalkyl chitosan.
- a coating liquid is prepared using the dispersant of the present invention, if a polybasic acid having a valence of 2 or more, particularly a valence of 3 or more is used as the organic acid, the hydroxyalkyl chitosan as the dispersant is crosslinked. Thus, the film forming ability is exhibited. This point will be described in detail.
- the carbon filler is mixed with the dispersant into an aqueous solvent composed of water and / or a hydrophilic organic solvent, or in a liquid medium such as a non-aqueous polar solvent.
- a coating liquid containing the dispersion is used.
- this coating liquid is applied, for example to various products, it can be set as the composite material which provided the uniform electroconductivity.
- the dispersant of the present invention is particularly useful from the viewpoint of environmental protection and health damage prevention because the carbon filler can be satisfactorily dispersed in an aqueous solvent.
- the liquid medium used in the present invention is preferably water or a mixed medium composed of water and / or an organic solvent miscible with water.
- the dispersant of the present invention is preferably in the form of a solution obtained by dissolving at least hydroxyalkylchitosan in these liquid media.
- the carbon filler to be dispersed with the hydroxyalkyl chitosan which is the main component of the dispersant of the present invention and further bound will be described.
- the carbon filler used in the present invention any of granular, flaky and short fiber can be used.
- granular materials include carbon black, acetylene black, ketjen black, and furnace black.
- flakes include natural graphite, quiche graphite, and artificial (artificial) graphite.
- Examples of short fibers include PAN-based carbon fibers, pitch-based carbon fibers, carbon nanofibers, and carbon nanotubes.
- More suitably used carbon fillers include carbon black, acetylene black, ketjen black, furnace black, natural graphite, artificial (artificial) graphite, quiche graphite, amorphous carbon, hard carbon, soft carbon, activated carbon, carbon nano Examples include fibers, carbon nanotubes, and fullerenes.
- the amount of carbon filler used in preparing a coating liquid obtained by dispersing the carbon filler in a liquid medium with the dispersant of the present invention is usually 0.01 to 30 parts by mass with respect to 100 parts by mass of the coating liquid. The degree, preferably 1 to 20 parts by mass.
- the amount of the dispersant of the present invention used is preferably 0.1 to 10 parts by mass, more preferably 0.1 to 10 parts by mass, more preferably 1 part by mass of the carbon filler, based on the relationship between the main component hydroxyalkyl chitosan and the carbon filler.
- the amount is preferably about 0.5 to 5 parts by mass.
- the amount of carbon filler used in the coating liquid varies depending on the purpose of use, but if it is less than 0.01 parts by mass, the carbon filler-containing composite material to be formed has functions such as coloring power and conductivity. There may be a shortage. On the other hand, when the amount of the carbon filler used exceeds 30 parts by mass, other components are insufficient, and other performance required for the composite material may be deteriorated.
- the aqueous solvent (aqueous dispersion medium) used in the solution-like dispersant of the present invention and the carbon filler-dispersed composite material such as a coating liquid provided by the dispersant of the present invention includes water, A mixed dispersion medium of an organic solvent miscible with water and water is also preferably used. A conventionally well-known thing can be used as an organic solvent miscible with water.
- alcohols such as methyl alcohol, ethyl alcohol, n-propyl alcohol, isopropyl alcohol (IPA), n-butyl alcohol, s-butyl alcohol, isobutyl alcohol, t-butyl alcohol, methyl acetate, ethyl acetate, n-acetate Propyl, isopropyl acetate, n-butyl acetate, isobutyl acetate, methoxybutyl acetate, cellosolve acetate, amyl acetate, methyl lactate, ethyl lactate, butyl lactate ester, acetone, methyl ethyl ketone, methyl isobutyl ketone, diisobutyl ketone, cyclohexanone, etc.
- IPA isopropyl alcohol
- IPA isopropyl alcohol
- IPA isopropyl alcohol
- IPA isopropyl alcohol
- IPA isoprop
- Examples include ketones, amides such as N-methyl-2-pyrrolidone, N, N-dimethylacetamide, and N, N-dimethylformamide, and sulfoxides such as dimethyl sulfoxide. Of these, alcohols are preferably used, and IPA is particularly preferably used. These water-miscible organic solvents may be used alone or in combination.
- an organic solvent / water mixed medium composed of an organic solvent miscible with water is used for the solution-like dispersant of the present invention and the carbon filler-dispersed composite material such as a coating solution provided by the dispersant of the present invention.
- the amount of the organic solvent in the aqueous mixed dispersion medium (100% by mass) is arbitrary between 1 and 99% by mass, but a mixed dispersion medium between 5 and 60% by mass is more preferably used.
- the IPA content is preferably 1 to 40% by mass, and more preferably 5 to 40% by mass.
- the addition amount of hydroxyalkyl chitosan is 0.02 to 20 mass in 100 mass parts of the carbon filler dispersion coating liquid.
- Part and the amount of carbon filler added is 0.01 to 30 parts by mass.
- the coating liquid is prepared using the dispersant of the present invention, as described above, if a polybasic acid having a valence of 2 or more, particularly a valence of 3 or more is used as the organic acid as an additive of the dispersant, the dispersant
- the hydroxyalkyl chitosan which is the main component of, is crosslinked to exhibit a film forming ability. Therefore, the organic acid and / or derivative thereof may be added as an additive of the liquid dispersant in order to enhance the solubility of the hydroxyalkylchitosan, but may be added as a component of the coating liquid.
- hydroxyalkylchitosan that also functions as a film-forming component
- other resin components can be appropriately used as the film-forming component in the coating solution.
- a coating liquid carbon filler-containing composite material
- hydroxyalkylchitosan a coating film excellent in adhesion and solvent resistance is formed. Is done. This is because the organic acid and / or derivative thereof acts as a crosslinking agent for the hydroxyalkyl chitosan and, optionally, the resin component to be added at the time of heat-drying after coating.
- a carbon filler-containing coating film having excellent adhesion and solvent resistance can be formed on the material surface.
- organic acid or derivative thereof used in the present invention conventionally known ones can be used.
- organic acids themselves, acid anhydrides thereof, salts of some or all carboxyl groups of these organic acids, particularly ammonium salts and amine salts, alkyl esters and amides of some or all carboxyl groups of polybasic acids , Imide, amidoimide, N-hydroxysuccinimide, N-hydroxysulfosuccinimide, or a derivative obtained by modifying one or more of these with a derivative thereof can be used.
- These organic acid derivatives are preferably compounds that regenerate the organic acid when the carbon filler-containing composite material to be formed later is heated.
- the organic acid preferably used in the present invention is a dibasic acid or more, particularly a trivalent or more polybasic acid such as citric acid, 1,2,3-, from the viewpoint of crosslinkability with respect to hydroxyalkylchitosan constituting the dispersant.
- trimellitic acid, pyromellitic acid, ethylenediaminetetra examples include acetic acid, 1,4,5,8-naphthalenetetracarboxylic acid and 1,2,3,4,5,6-cyclohexanehexacarboxylic acid and acid anhydrides thereof.
- the amount of the organic acid and / or derivative thereof used in the present invention is 0.2 to 3 parts by mass, particularly 0.5 to 2 parts by mass, per 1 part by mass of the hydroxyalkyl chitosan that is the main component of the dispersant. preferable.
- the amount of the organic acid and / or derivative thereof used per 100 parts by weight of the coating liquid is 0.01 to 20 parts by weight, particularly 0.02 to 10 parts by mass is preferable.
- the amount of the organic acid and / or derivative thereof used is less than 0.01% by mass, the carbon filler-containing composite material to be formed adheres to the object to be coated and is insoluble in the organic solvent, non-swelling. This is not preferable because of insufficient properties.
- the amount used exceeds 20% by mass, the flexibility of the formed film or the carbon filler-containing composite material is reduced and it is not economical, which is not preferable.
- the carbon filler dispersion coating liquid containing the dispersant of the present invention is applied to the coating film in order to impart physical strength, durability, wear resistance, adhesion to the object to be coated, etc.
- Resin components other than hydroxyalkylchitosan can be added as a binder for the membrane.
- Resin components used in the carbon filler dispersion coating liquid include polyvinyl alcohol, fluorine-containing polymer, cellulose polymer, starch polymer, styrene polymer, acrylic polymer, and styrene-acrylate copolymer. And conventionally known resins such as polyamide, polyimide and polyamideimide.
- resin components can be obtained from the market and used as they are, but it is necessary to select or adjust them appropriately according to the dispersion medium to be used.
- a resin having a hydrophilic group such as a carboxyl group.
- the amount of the resin component used in the carbon filler dispersion coating liquid containing the dispersant of the present invention is 0.1 to 20 parts by mass, especially 1 part by mass of hydroxyalkyl chitosan which is the main component of the dispersant of the present invention. 0.5 to 10 parts by mass is preferable. Further, the amount of the total resin component containing hydroxyalkyl chitosan in 100 parts by mass of the carbon filler dispersion coating liquid is 1 to 40 parts by mass in solid content, and preferably 2 to 20 parts by mass.
- the amount of the resin component used is less than 1 part by mass, the strength of the carbon filler-containing composite material to be formed and the adhesion to the object to be coated will be insufficient, and the coating film component will fall off from the coating film layer. It is not preferable because it becomes easy to do.
- the amount used exceeds 40 parts by mass, it is difficult to obtain a uniform solution, and the carbon filler which is a dispersoid is covered with the resin component and the functionality of the carbon filler is not sufficiently exhibited.
- the organic acid and / or derivative and organic solvent used in the present invention general commercial products can be used as they are, but they may be used after being purified as necessary.
- the polymer such as hydroxyalkyl chitosan and the resin component and the organic acid and / or derivative thereof are composed of an aqueous solvent or a non-aqueous solvent.
- the order of addition to these dispersion media may be the same as the polymer or organic acid containing hydroxyalkyl chitosan and / or its derivative first.
- stirring at room temperature is sufficient, but heating may be performed as necessary.
- the carbon filler dispersion coating liquid containing the dispersant of the present invention is a liquid medium composed of an aqueous solvent or a non-aqueous solvent, the dispersant of the present invention mainly composed of hydroxyalkyl chitosan, and a carbon filler, and further necessary. Accordingly, a resin component or an organic acid as a coating film reinforcing component is added and kneaded.
- the ratio of each component in the coating liquid is, for example, when the coating liquid is 100 parts by mass, hydroxyalkyl chitosan is 0.02 to 20 parts by mass, carbon filler is 0.01 to 30 parts by mass, and other resins. It is particularly preferable that the component is 1 to 20 parts by mass and the organic acid and / or derivative thereof is 0.02 to 20 parts by mass.
- the solid content of the coating solution is preferably 0.05 to 50% by mass.
- the carbon filler dispersion coating liquid containing the dispersant of the present invention may contain any component other than the above components, for example, other crosslinking agents.
- crosslinking agents include, for example, epoxy compounds such as ethylene glycol diglycidyl ether, polyethylene glycol diglycidyl ether, and glycerol polyglycidyl ether; toluylene diisocyanate, xylylene diisocyanate, hexamethylene diisocyanate, phenyl diisocyanate.
- Isocyanate compounds such as phenols, alcohols, active methylenes, mercaptans, acid amides, imides, amines, imidazoles, ureas, carbamic acids, imines, oximes, sulfites, etc.
- blocked isocyanate compounds blocked with a blocking agent aldehyde compounds such as glyoxal, glutaraldehyde, and dialdehyde starch.
- (meth) acrylate compounds such as polyethylene glycol diacrylate, polyethylene glycol dimethacrylate, and hexanediol diacrylate; methylol compounds such as methylol melamine and dimethylol urea; organic acid metal salts such as zirconyl acetate, zirconyl carbonate, and titanium lactate; aluminum Such as trimethoxide, aluminum tributoxide, titanium tetraethoxide, titanium tetrabutoxide, zirconium tetrabutoxide, aluminum dipropoxide acetylacetonate, titanium dimethoxide bis (acetylacetonate), titanium dibutoxide bis (ethylacetoacetate) A metal alkoxide compound is mentioned.
- silane coupling agents such as propyltriethoxysilane, 3-isocyanatopropyltriethoxysilane and imidazolesilane
- silane compounds such as methyltrimethoxysilane, tetraethoxysilane and methyltriethoxysilane
- crosslinking agents are not essential, but when used, the amount of the crosslinking agent is 100 parts by mass with the amount of the hydroxyalkyl chitosan as the main component of the dispersant plus the amount of the resin component.
- the amount is preferably 0.01 to 200 parts by mass.
- a hydroxyalkyl chitosan as a dispersant, a carbon filler, an organic acid, and a resin component are added to an aqueous dispersion medium so as to have the above ratio, and then mixed and dispersed using a conventionally known mixer.
- a conventionally known mixer a ball mill, a sand mill, a pigment disperser, a crusher, an ultrasonic disperser, a homogenizer, a planetary mixer, a Hobart mixer, or the like can be used.
- the carbon filler is first mixed using a mixer such as a grinder, planetary mixer, Henschel mixer, omni mixer, etc., and then the hydroxyalkyl chitosan, the resin component, and the organic acid are added and mixed uniformly. preferable. By adopting these methods, a uniform coating solution can be easily obtained.
- a mixer such as a grinder, planetary mixer, Henschel mixer, omni mixer, etc.
- the coating amount when applying the above coating liquid to various objects to be coated is not particularly limited, but the thickness of the carbon filler-containing composite material formed after drying is usually 0.05 to 100 ⁇ m, preferably Is generally 0.1 to 10 ⁇ m.
- a carbon filler-containing composite material is provided by applying a carbon filler dispersion coating liquid containing the dispersant of the present invention to the surface of an object to be coated and drying it.
- the object to be used in this case include metals such as aluminum and copper, glass, natural resins, synthetic resins, ceramics, paper, fibers, woven fabrics, non-woven fabrics, and leathers.
- the carbon filler-containing composite material obtained as described above comprises a carbon filler uniformly dispersed in a good state by a hydroxyalkyl chitosan as a dispersant on a workpiece, and a hydroxy compound crosslinked with an organic acid.
- a coating film layer comprising an alkyl chitosan or a polymer such as a resin component is formed and arranged, and the coating film layer has the characteristics as described above.
- Table 1 shows the compositions of the dispersants of Examples and Comparative Examples.
- the hydroxyalkyl chitosan used as the main component of each dispersant was abbreviated as follows. Hydroxyethyl chitosan; HEC Hydroxypropyl chitosan; HPC Hydroxybutyl chitosan; HBC Hydroxybutyl hydroxypropyl chitosan; HBPC Glycerylated chitosan; DHPC
- the organic acids and organic solvents used as additive components are abbreviated as follows.
- Example 1 In 90 parts of ion-exchanged water, 5 parts of DHPC, which is a hydroxyalkyl chitosan having a hydroxyalkylation degree (hereinafter referred to as HA degree) of 0.6 and a weight average molecular weight (MW) of 50,000, was dispersed. And after adding 5 parts of BTC which is an organic acid to the obtained dispersion liquid, it stirred and dissolved at room temperature for 4 hours, and prepared 100 parts of dispersing agents consisting of aqueous solution.
- HA degree hydroxyalkyl chitosan having a hydroxyalkylation degree
- MW weight average molecular weight
- Examples 2 to 10 As shown in Table 1, the type of hydroxyalkyl chitosan, the degree of HA conversion, the MW and the amount used (mass), the type and amount of organic acid, the type and amount of liquid medium were changed, and the same as in Example 1 The liquid dispersants of Examples 2 to 10 were prepared by the method.
- Example of Use 1 Using the dispersant prepared from the aqueous solution of Example 3 prepared above, the carbon filler was dispersed in this liquid as follows to prepare a carbon filler dispersion coating liquid. At this time, furnace black (manufactured by Tokai Carbon Co., Ltd., Toka Black # 4500) was used as the carbon filler. Then, with respect to 10 parts of this furnace black, the dispersing agent of Example 3 prepared previously was stirred and mixed in a planetary mixer at a rotation speed of 60 rpm for 120 minutes at a blending ratio of 90 parts, and the carbon filler dispersion coating was applied. A working solution was obtained.
- furnace black manufactured by Tokai Carbon Co., Ltd., Toka Black # 4500
- the carbon filler dispersion coating solution obtained above was used as a bar coater no. 6 was applied and developed on a glass plate, the appearance of the coating film was visually confirmed, and the dispersibility of the carbon filler was evaluated.
- the case where the coating film was uniform and no irregularities, stripes, or unevenness was observed was evaluated as “dispersible”, and the case where irregularities, stripes, or irregularities were observed in the coating film was evaluated as “bad”.
- the evaluation results are shown in Table 2.
- the storage stability of the carbon filler dispersion coating solution obtained above was evaluated by the following method.
- the carbon filler dispersion coating solution was placed in a 500 ml glass container and stored at room temperature for 1 month. And the state after a preservation
- the evaluation results are shown in Table 2.
- Examples 2 to 10 and Comparative Example 1 A carbon filler dispersion coating solution was prepared in the same manner as in Example 1 except that the dispersant and carbon filler described in Table 2 below were used instead of the dispersant and carbon filler used in Example 1 of Use. . About each obtained coating liquid, it carried out similarly to the case of the Example 1, and dispersibility and storage stability were evaluated. The results are shown in Table 2 below.
- CNT carbon nanotube
- Tokyo Chemical Industry Co., Ltd., multi-layer type, diameter 10-20 nm, length 5-15 ⁇ m] 5 g of the dispersant of Example 2, 75 g of water, 20 g of IPA and 500 g of zirconia beads (diameter 0.8 mm) were charged and dispersed with a paint shaker for 2 hours to obtain a CNT dispersion coating solution.
- a PET film having a CNT thin film was prepared.
- the CNT thin film was not peeled off and the adhesion was good.
- the surface resistivities of the untreated PET film that was not used to form the thin film and the PET film that had the CNT thin film layer obtained above were measured for Hiresta UP MCP-HT450 (manufactured by Mitsubishi Chemical Analytech Co., Ltd.). ).
- the untreated product was> 10 14 ⁇ / ⁇ , whereas the treated product was 2.3 ⁇ 10 6 ⁇ / ⁇ , which was a lower resistivity than the untreated product. From this, it can be said that the dispersant of the example of the present invention is also effective as an application to an antistatic film or the like.
- Table 3 shows the compositions of the non-aqueous and aqueous hydroxyalkyl chitosan solutions used in Examples and Comparative Examples.
- 1,2,3,4-butanetetracarboxylic acid is abbreviated as BTC
- 1,2,3,4,5,6-cyclohexanehexacarboxylic acid is abbreviated as CHHC.
- the polar solvent used for various polymer solutions is abbreviated as dimethyl sulfoxide as DMSO, and the others are the same as those mentioned above.
- Example 11 5 parts of hydroxyethyl chitosan (haation degree 1.2, MW 80,000) was dispersed in 93 parts of DMSO as a non-aqueous medium, and 2 parts of CHHC was added to the dispersion, and then at 50 ° C. for 2 hours. The mixture was dissolved by stirring to prepare 100 parts of a hydroxyethylchitosan solution.
- Examples 12 to 16 As shown in Table 3, the type and amount of use (mass) of hydroxyalkyl chitosan, the type and amount of organic acid or the type and amount of polar solvent were changed, and in the same manner as in Example 11, A hydroxyalkyl chitosan solution was prepared.
- a coating liquid containing a carbon filler was prepared by the following method.
- a slurry-like coating liquid was obtained by mixing with 7 parts of acetylene black as a carbon filler and 93 parts of the hydroxyalkylchitosan solution of Example 11 in Table 3 for 120 minutes by stirring with a planetary mixer at a rotation speed of 60 rpm. It was.
- the coating solution obtained above using a current collector made of aluminum foil having a thickness of 20 ⁇ m as a base, coating the coating liquid on one side of the base with a comma roll coater, and then using an oven at 110 ° C. The coating was dried for 2 minutes and further dried in an oven at 180 ° C. for 2 minutes to remove the solvent and crosslink the hydroxyalkylchitosan component to form a coating film having a dry film thickness of 1 ⁇ m on the current collector.
- the coating film layer in which the above-mentioned mesh is formed is 1 mol as a supporting salt in a mixed solvent in which EC (ethylene carbonate): PC (propylene carbonate): DME (dimethoxyethane) is mixed at a volume ratio of 1: 1: 2.
- a coating solution is applied on a glass plate with a comma roll coater, and then dried in an oven at 200 ° C. for 1 minute to conduct the conductive coating.
- a film dry film thickness 4 ⁇ m was formed.
- the surface resistivity of the obtained coating film was determined by a 4-probe method according to JIS K 7194. The measurement was performed under the conditions of 25 ° C. and 60% relative humidity using a Lorester GP, MCP-T610 manufactured by Mitsubishi Chemical Analytech. The results are shown in Table 4.
- Examples of use 12 to 16 A coated film was prepared in the same manner as in Example 11 except that the hydroxyalkyl chitosan solution described in Table 4 was used instead of the hydroxyalkyl chitosan solution in Example 11, and the adhesion, dissolution / swellability thereof was determined. The surface resistivity was examined and the results shown in Table 4 were obtained. As shown in Table 4, it was confirmed that the hydroxyalkyl chitosan solution of the present invention has a good film forming ability by dispersing the carbon filler in a good state and at the same time by crosslinking the hydroxyalkyl chitosan component. .
- a positive electrode solution containing a positive electrode active material was prepared by the following method.
- As a material of the positive electrode solution 90 parts of LiCoO 2 powder having a particle diameter of 1 to 100 ⁇ m, 5 parts of acetylene black as a conductive assistant, and 50 parts of 5% NMP solution (PVDF solution) of polyvinylidene fluoride as a binder are used.
- the mixture was mixed and stirred for 120 minutes at a rotational speed of 60 rpm with a planetary mixer to obtain a positive electrode solution containing a slurry-like positive electrode active material.
- the surface of the coating film layer of Example 12 was applied with a comma roll coater, dried in an oven at 110 ° C. for 2 minutes, and further dried in an oven at 180 ° C. for 2 minutes.
- the positive electrode composite layer in which the solvent was removed and an active material layer having a dry film thickness of 100 ⁇ m was formed on the coating film layer was obtained.
- the positive electrode composite layer obtained by the above method was pressed under the condition of 5,000 kgf / cm 2 to make the film uniform. Next, aging was performed in a vacuum oven at 80 ° C. for 48 hours to sufficiently remove volatile components (such as a solvent and unreacted polybasic acid), and a positive electrode plate was obtained.
- Example of Use 12 (Negative electrode plate) Using the coating liquid of Example of Use 12, using a copper foil current collector as a base, coating the coating liquid on one side of the base with a comma roll coater, and then drying in an oven at 110 ° C. for 2 minutes, Furthermore, it dried for 2 minutes in 180 degreeC oven, the solvent was removed, and the resin binder was bridge
- a negative electrode solution containing a negative electrode active material was prepared by the following method.
- a material for the negative electrode solution 90 parts of carbon powder obtained by pyrolyzing coal coke at 1,200 ° C., 5 parts of acetylene black as a conductive additive, and 5% NMP solution of polyvinylidene fluoride as a binder (PVDF Solution)
- PVDF Solution NMP solution of polyvinylidene fluoride as a binder
- the surface of the coating film layer was coated with a comma roll coater, dried in an oven at 110 ° C. for 2 minutes, and further dried in an oven at 180 ° C. for 2 minutes. And a negative electrode composite layer in which an active material layer having a dry film thickness of 100 ⁇ m was formed on the coating film layer was obtained.
- the negative electrode composite layer obtained by the above method was pressed under the condition of 5,000 kgf / cm 2 to make the film uniform. Next, aging was performed in a vacuum oven at 80 ° C. for 48 hours to sufficiently remove volatile components (such as a solvent and unreacted polybasic acid) to obtain a negative electrode plate.
- the battery From the polyolefin film (polypropylene, polyethylene or copolymer thereof) having a three-dimensional pore structure (spongy) wider than the positive electrode plate, using the positive electrode plate and the negative electrode plate obtained above.
- the electrode body was first constructed by winding it in a spiral through a separator. Next, this electrode body was inserted into a bottomed cylindrical stainless steel container also serving as a negative electrode terminal, and a battery with an AA size and a rated capacity of 500 mAh was assembled.
- EC ethylene carbonate
- PC propylene carbonate
- DME dimethyl methoxyethane
- a charge / discharge measuring device For the measurement of battery characteristics, a charge / discharge measuring device was used, and each cell was charged at a temperature of 25 ° C. with a current value of a charging current of 0.2 CA, and charged from the charging direction to a battery voltage of 4.1 V. After 10 minutes of rest, the battery was discharged at the same current until it reached 2.75 V. After 10 minutes of rest, 100 cycles of charge / discharge were repeated under the same conditions to measure charge / discharge characteristics. When the charge / discharge capacity value at the first cycle was set to 100, the charge / discharge capacity value at the 100th time (charge / discharge capacity retention rate) was 97%.
- Example 18 and 19 (Positive electrode plate, negative electrode plate, battery) Instead of the coating solution and coating film of Example 12 used to produce the positive electrode plate and the negative electrode plate used in Example of Use 17, the coating solution and coating film shown in Table 5 below are used. An electrode plate and a battery were produced in the same manner as in Working Example 17 except that the charge / discharge characteristics were measured. The results are shown in Table 5.
- an electrode solution containing an active material was prepared by the following method.
- a material for the electrode solution 100 parts of high-purity activated carbon powder having a specific surface area of 1,500 m 2 / g and an average particle diameter of 10 ⁇ m and 8 parts of acetylene black as a conductive material are charged into a planetary mixer, A polyvinylidene fluoride NMP solution was added to 45% and mixed for 60 minutes. Then, it diluted with NMP so that solid content concentration might be 42%, and also mixed for 10 minutes, and obtained the electrode solution.
- This electrode solution was applied onto the coating film layer using a doctor blade, and dried at 80 ° C. for 30 minutes with a blow dryer. Then, it pressed using the roll-press machine and obtained the polarizable electrode plate for capacitors of thickness 80micrometer and density 0.6g / cm ⁇ 3 >.
- Two sheets of capacitor polarizable electrode plates manufactured as described above were cut out into a circle having a diameter of 15 mm, and dried at 200 ° C. for 20 hours.
- the electrode layer surfaces of the two electrode plates were opposed to each other, and a circular cellulose separator having a diameter of 18 mm and a thickness of 40 ⁇ m was sandwiched between them.
- This was stored in a stainless steel coin-type outer container (diameter 20 mm, height 1.8 mm, stainless steel thickness 0.25 mm) provided with polypropylene packing.
- the electrolyte is poured into the container so that no air remains, and the outer container is fixed with a 0.2 mm thick stainless steel cap through a polypropylene packing, and the container is sealed, and the diameter is 20 mm.
- a coin-type capacitor having a thickness of about 2 mm was manufactured.
- As the electrolytic solution a solution in which tetraethylammonium tetrafluoroborate was dissolved in propylene carbonate at a concentration of 1 mol / liter was used. Table 6 shows the results of measuring the capacitance and internal resistance of the capacitor thus obtained.
- Examples 21 and 22 (capacitors)
- Example Usage Example 12 instead of the coating solution of Example Usage Example 12 used in Example of Use Example 20, except that the coating solution shown in Table 6 was used, an electrode plate and a capacitor were prepared in the same manner as Example Usage Example 20, Each characteristic was evaluated. The results are shown in Table 6.
- Example Usage Example 12 instead of the coating liquid of Example Usage Example 12 used in Example of Use Example 20, an electrode plate and a capacitor were prepared in the same manner as Example Usage Example 20 except that the coating liquid of Comparative Usage Example 1 was used. Characteristics were evaluated. The results are shown in Table 6.
- the internal resistance and capacitance in Table 6 were measured and evaluated as follows.
- the obtained capacitor was measured for capacitance and internal resistance at a current density of 20 mA / cm 2 , and evaluated according to the following evaluation criteria based on Comparative Use Example 2.
- Capacitance evaluation criteria A: The capacitance is 20% or more larger than that of Comparative Use Example 2. B: Capacitance greater by 10% or more and less than 20% than Comparative Use Example 2. C: The capacitance is equal to or less than that of Comparative Use Example 2. (Evaluation criteria for internal resistance) A: The internal resistance is 20% or more smaller than that of Comparative Use Example 2. B: The internal resistance is 10% or more and less than 20% smaller than Comparative Use Example 2. C: The comparative use example 2 and internal resistance are equivalent or less.
- an electrode plate including a coating film formed by a coating solution using a hydroxyalkylchitosan solution that functions as a dispersant of the present invention is prepared, and the electrode plate When a capacitor is manufactured using the capacitor, a capacitor having a large capacitance and a small internal resistance can be obtained.
- a dispersant that exhibits high carbon filler dispersibility and carbon filler dispersion stability is obtained.
- a coating liquid in which the above dispersant and carbon filler are dispersed in an aqueous medium or non-aqueous medium it has high dispersibility and dispersion stability, and also functions as a binder for carbon filler.
- this coating solution by applying this coating solution to the coating solution, a carbon filler-containing composite material in which the carbon filler is effectively dispersed is formed, and the functionality of the carbon filler such as conductivity is sufficiently expressed.
- this coating solution by applying this coating solution to various coated objects such as metal, resin, ceramics, paper, fiber, glass, etc., the conductivity that carbon filler has is effectively demonstrated, and excellent performance It is also possible to provide a conductive composite material.
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Abstract
Description
本発明の分散剤は、水系溶媒又は非水系溶媒からなる液媒体中に炭素フィラーを分散させるための分散剤であり、かつ、ヒドロキシアルキルキトサンを主成分とすることを特徴とする。本発明の分散剤は、特に、水、或いは、水及び水と混和する有機溶剤との水系の混合液媒体に炭素フィラーを分散させるものとして有用である。本発明の分散剤において、炭素フィラーの分散効果を発現する主成分は、環境に対する負荷の少ない天然系ポリマーであるヒドロキシアルキルキトサンである。本発明においては、特に、グリセリル化キトサン、ヒドロキシエチルキトサン、ヒドロキシプロピルキトサン、ヒドロキシブチルキトサン及びヒドロキシブチルヒドロキシプロピルキトサンからなる群から選ばれる少なくとも1種であることが好ましい。
<各種分散剤>
表1に、実施例及び比較例の分散剤の組成を示した。各分散剤の主成分として用いたヒドロキシアルキルキトサンは、それぞれ下記のように略記した。
ヒドロキシエチルキトサン;HEC
ヒドロキシプロピルキトサン;HPC
ヒドロキシブチルキトサン;HBC
ヒドロキシブチルヒドロキシプロピルキトサン;HBPC
グリセリル化キトサン;DHPC
又、添加成分として用いた有機酸及び有機溶剤は、下記のように略記した。
1,2,3-プロパントリカルボン酸;PTC
1,2,3,4-ブタンテトラカルボン酸;BTC
メチルアルコール;MeOH
エチルアルコール;EtOH
イソプロピルアルコール;IPA
N-メチル-2-ピロリドン;NMP
イオン交換水90部に、ヒドロキシアルキル化度(以下、HA化度)が0.6、重量平均分子量(MW)が50,000の、ヒドロキシアルキルキトサンであるDHPCを5部分散した。そして、得られた分散液に、有機酸であるBTCを5部加えた後、室温で4時間、撹拌溶解して、水溶液からなる分散剤を100部調製した。
表1に示したように、ヒドロキシアルキルキトサンの種類、HA化度、MW及び使用量(質量)、有機酸の種類及び使用量、液媒体の種類及び使用量を変え、実施例1と同様の方法によって実施例2~10の液状の分散剤を調製した。
イオン交換水87部に、キトサン(HA化度0.0、MW100,000)5部を分散し、得られた分散液にクエン酸8部を加えた後、室温で4時間、撹拌溶解して、比較例1の水溶液からなる分散剤を100部調製した。
[実施使用例1]
上記で調製した実施例3の水溶液からなる分散剤を用い、以下のようにして炭素フィラーをこの液中に分散させて、炭素フィラー分散塗工液を作製した。この際、炭素フィラーには、ファーネスブラック(東海カーボン(株)社製、トーカブラック#4500)を用いた。そして、このファーネスブラック10部に対して、先に調製した実施例3の分散剤を90部の配合比で、プラネタリーミキサーにて、回転数60rpmで、120分間撹拌混合させて炭素フィラー分散塗工液を得た。
上記で得た炭素フィラー分散塗工液を、バーコーターNo.6を用いて、ガラス板に塗布展色し、塗膜の外観を目視にて確認し、炭素フィラーの分散性を評価した。塗膜が均一でブツ、スジ、ムラが見られない場合を分散性「良」とし、塗膜にブツやスジ、ムラが見られる場合を分散性「不良」と評価した。評価結果を表2に示した。
更に、上記で得られた炭素フィラー分散塗工液の保存安定性を下記の方法で評価した。炭素フィラー分散塗工液を500mlのガラス容器に入れ、1ヶ月間室温静置保存した。そして、保存後の状態を目視で観察し、下記の基準で評価した。上澄み液の発生並びにフィラー沈降がないものをA、上澄み液発生とフィラー沈降があるものの、容器を軽く振ればフィラーが再分散するものをB、上澄み液発生とフィラー沈降があり、容器を軽く振った程度ではフィラーは再分散せず、分散機による再分散が必要なものをCと評価した。評価結果を表2に示した。
実施使用例1で用いた分散剤及び炭素フィラーに代えて、下記表2に記載の分散剤及び炭素フィラーを使用した以外は、実施使用例1と同様にして炭素フィラー分散塗工液を作製した。得られた各塗工液について、実施使用例1の場合と同様にして、分散性及び保存安定性を評価した。下記表2に結果を示した。
250mlポリ容器に、カーボンナノチューブ(CNT)〔東京化成工業(株)、多層型、直径10-20nm、長さ5-15μm〕を0.3g、実施例2の分散剤を5g、水を75g、IPAを20g、並びにジルコニアビーズ(直径0.8mm)500gを仕込み、ペイントシェーカーにて2時間分散し、CNT分散塗工液を得た。上記で得た塗工液をPETフィルム(厚さ0.1μm、A4サイズ)に、乾燥塗布量が0.3g/m2になるようバーコーターで塗布し、180℃×2分送風乾燥することでCNT薄膜を有するPETフィルムを作製した。
表3に、実施例及び比較例で用いた非水系及び水系のヒドロキシアルキルキトサン溶液の組成を示した。
有機酸の略記は、1,2,3,4-ブタンテトラカルボン酸をBTCと略し、1,2,3,4,5,6-シクロヘキサンヘキサカルボン酸をCHHCと略した。又、各種ポリマー溶液に使用した極性溶媒は、ジメチルスルホキシドをDMSOと略し、それ以外は、先に挙げたものと同様である。
非水系媒体である93部のDMSO中に、ヒドロキシエチルキトサン(HA化度1.2、MW80,000)を5部分散し、該分散液にCHHCを2部加えた後、50℃で2時間撹拌溶解し、100部のヒドロキシエチルキトサン溶液を調製した。
表3に示すように、ヒドロキシアルキルキトサンの種類及び使用量(質量)、有機酸の種類及び使用量又は極性溶媒の種類及び使用量を変え、実施例11と同様の方法により、各実施例のヒドロキシアルキルキトサン溶液を調製した。
[実施使用例11]
先に調製したヒドロキシアルキルキトサンの非水系溶液を分散剤として用い、炭素フィラーを含む塗工液を以下の方法により作製した。炭素フィラーとしてのアセチレンブラック7部及び表3の実施例11のヒドロキシアルキルキトサン溶液93部の配合比で、プラネタリーミキサーにて回転数60rpmで120分間撹拌混合させてスラリー状の塗工液を得た。
実施例11のヒドロキシアルキルキトサン溶液に代えて、表4に記載のヒドロキシアルキルキトサン溶液を使用した以外は、実施使用例11と同様にして塗工膜を作製し、その密着性、溶解・膨潤性、表面抵抗率を調べ、表4に記載の結果を得た。表4に示したように、本発明のヒドロキシアルキルキトサン溶液は、炭素フィラーを良好な状態に分散すると同時に、ヒドロキシアルキルキトサン成分が架橋することで、良好な皮膜形成能を有することが確認できた。
[実施使用例17(正極電極板、負極電極板、電池)]
(正極電極板)
正極活物質を含む正極液を以下の方法により作製した。正極液の材料としては、1~100μmの粒径を有するLiCoO2粉末を90部、導電助剤としてアセチレンブラックを5部、バインダーとしてポリビニリデンフルオライドの5%NMP溶液(PVDF溶液)50部の配合比で、プラネタリーミキサーにて回転数60rpmで120分間撹拌混合することによりスラリー状の正極活物質を含む正極液を得た。
実施使用例12の塗工液を用い、銅箔集電体を基体として、該基体上の片面にコンマロールコーターにて塗工液を塗工後、110℃のオーブンで2分間乾燥処理し、更に180℃のオーブンで2分間乾燥して溶媒を除去するとともに樹脂バインダーを架橋させて、集電体上に乾燥膜厚が1μmの塗工膜層を形成した。
以上で得られた正極電極板及び負極電極板を用い、正極電極板より幅広の三次元空孔構造(海綿状)を有するポリオレフィン系(ポリプロピレン、ポリエチレン又はそれらの共重合体)の多孔性フィルムからなるセパレータを介して、渦巻き状に捲回して、先ず電極体を構成した。次にこの電極体を、負極端子を兼ねる有底円筒状のステンレス容器内に挿入し、AAサイズで定格容量500mAhの電池を組み立てた。この電池にEC(エチレンカーボネート):PC(プロピレンカーボネート):DME(ジメトキシエタン)をそれぞれ体積比1:1:2で全量1リットルになるように調製した混合溶媒に、支持塩として1モルのLiPF6を溶解したものを電解液として注液した。
(正極電極板、負極電極板、電池)
実施使用例17で用いた正極電極板及び負極電極板の作製に使用した実施使用例12の塗工液及び塗工膜に代えて、下記表5に記載の塗工液及び塗工膜を使用した以外は、実施使用例17と同様にして、電極板及び電池を作製し、充放電特性を測定した。結果を表5に示す。
[実施使用例20(キャパシタ)]
実施使用例12の塗工液を用い、厚さ20μmのアルミニウム箔からなる集電体を基体として、該基体上の片面にコンマロールコーターにて塗工液を塗工後、110℃のオーブンで2分間乾燥処理し、更に180℃のオーブンで2分間乾燥して溶媒を除去するとともに樹脂バインダーを架橋させて、集電体上に乾燥膜厚が0.5μmの塗工膜層を形成した。
実施使用例20で用いた実施使用例12の塗工液に代えて、表6に記載の塗工液を使用した以外は、実施使用例20と同様にして、電極板及びキャパシタを作成し、各特性を評価した。結果を表6に示す。
実施使用例20で用いた実施使用例12の塗工液に代えて、比較使用例1の塗工液を使用した以外は実施使用例20と同様にして、電極板及びキャパシタを作成し、各特性を評価した。結果を表6に示す。
A:比較使用例2よりも静電容量が20%以上大きい。
B:比較使用例2よりも静電容量が10%以上20%未満大きい。
C:比較使用例2と静電容量が同等以下である。
(内部抵抗の評価基準)
A:比較使用例2よりも内部抵抗が20%以上小さい。
B:比較使用例2よりも内部抵抗が10%以上20%未満小さい。
C:比較使用例2と内部抵抗が同等以下である。
Claims (6)
- 水系溶媒又は非水系溶媒からなる液媒体中に炭素フィラーを分散させるための分散剤であり、かつ、ヒドロキシアルキルキトサンを主成分とすることを特徴とする炭素フィラー用分散剤。
- 前記ヒドロキシアルキルキトサンが、グリセリル化キトサン、ヒドロキシエチルキトサン、ヒドロキシプロピルキトサン、ヒドロキシブチルキトサン及びヒドロキシブチルヒドロキシプロピルキトサンからなる群から選ばれる少なくとも1種である請求項1に記載の炭素フィラー用分散剤。
- 前記ヒドロキシアルキルキトサンの重量平均分子量が、2,000~350,000である請求項1又は2に記載の炭素フィラー用分散剤。
- 前記ヒドロキシアルキルキトサンのヒドロキシアルキル化度が、0.5以上4以下である請求項1~3のいずれか1項に記載の炭素フィラー用分散剤。
- 更に、有機酸又はその誘導体を添加剤として含み、該有機酸の添加量が、ヒドロキシアルキルキトサン1質量部当たり0.2~3質量部である請求項1~4のいずれか1項に記載の炭素フィラー用分散剤。
- 前記炭素フィラーが、カーボンブラック、アセチレンブラック、ケッチェンブラック、ファーネスブラック、天然黒鉛、人造黒鉛、非晶質炭素、ハードカーボン、ソフトカーボン、活性炭、カーボンナノファイバー、カーボンナノチューブ、フラーレンからなる群から選ばれる少なくとも1種である請求項1~5のいずれか1項に記載の炭素フィラー用分散剤。
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US13/392,073 US8628610B2 (en) | 2009-08-27 | 2010-08-24 | Dispersant for use in a carbon filler |
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JP2011528796A JP5367826B2 (ja) | 2009-08-27 | 2010-08-24 | 炭素フィラー用分散剤 |
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PCT/JP2010/064262 WO2011024797A1 (ja) | 2009-08-27 | 2010-08-24 | 水系スラリー組成物、蓄電装置用電極板及び蓄電装置 |
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