WO2012161299A1 - Pâte de dispersion de pigment et son procédé de fabrication - Google Patents

Pâte de dispersion de pigment et son procédé de fabrication Download PDF

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Publication number
WO2012161299A1
WO2012161299A1 PCT/JP2012/063422 JP2012063422W WO2012161299A1 WO 2012161299 A1 WO2012161299 A1 WO 2012161299A1 JP 2012063422 W JP2012063422 W JP 2012063422W WO 2012161299 A1 WO2012161299 A1 WO 2012161299A1
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Prior art keywords
pigment
cellulose
mass
resin
pigment dispersion
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PCT/JP2012/063422
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English (en)
Japanese (ja)
Inventor
裕司 林
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旭化成ケミカルズ株式会社
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Priority to JP2013516449A priority Critical patent/JP6131185B2/ja
Publication of WO2012161299A1 publication Critical patent/WO2012161299A1/fr

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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
    • C09D5/44—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes for electrophoretic applications
    • C09D5/448—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes for electrophoretic applications characterised by the additives used
    • 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
    • C09D17/00—Pigment pastes, e.g. for mixing in paints

Definitions

  • the present invention relates to a pigment dispersion paste for an electrodeposition paint having high storage stability and excellent salt resistance and water resistance when used in an electrodeposition paint, and an efficient method for producing the pigment dispersion paste.
  • Patent Document 1 describes a pigment dispersion paste for electrodeposition paint using a cellulose composite and an electrodeposition paint composition using the same.
  • Patent Document 2 discloses that the standing stability of an inorganic pigment is improved using microcrystalline cellulose.
  • Patent Document 3 discloses an aqueous resin paint that contains atomized cellulose and can be sprayed.
  • Patent Document 4 discloses a technique in which crystalline cellulose is used in an ink composition for the purpose of preventing pigment settling.
  • JP 2006-111699 A Japanese Patent Laid-Open No. 5-132644 JP-A-5-163445 JP 2006-45248 A
  • the suspension stability means that a component such as a pigment is stabilized without causing sedimentation or aggregation when the pigment dispersion paste or paint is stored for a long period of time.
  • the redispersibility means that, even when stored for a long period of time, although precipitation of pigments or the like is observed, it can be easily returned to the state before long-term storage by stirring or the like.
  • Storage stability means that pigment pastes and paints are superior in suspension stability, redispersibility, or both, so that they do not cause problems in physical properties even after long-term storage. It has been disclosed that the storage stability of a pigment can be imparted by using a cellulose composite by the conventional technology.
  • Patent Document 1 shows that pigment dispersion paste using a cellulose composite can impart suspension stability and redispersibility of a pigment in an electrodeposition paint.
  • a cellulose composite if the compatibility between the added water-soluble polymer and the resin is poor, it is difficult to exert a suspension stabilizing function or a redispersibility imparting function, and pre-dispersion is necessary in advance. If the addition amount of the cellulose composite is increased when storage stability cannot be imparted due to insufficient addition amount, the storage stability is obtained, but the water resistance of the coating film is lowered.
  • patent document 2 since the cellulose composite was used in the Example and this also contains a water-soluble component, there existed the same faults as patent document 1.
  • Patent Document 3 discloses an aqueous resin coating composition containing atomized cellulose.
  • production of micronized cellulose is very troublesome and has a big problem that it is not practical.
  • Patent Document 4 a cellulose composite is used, and the pigment described in Patent Document 4 can be used in applications where water resistance is not a problem as in ink compositions. When the pigment is used for an application that requires high properties, there is still a problem.
  • the present inventor is not surprisingly stable even when the cellulose itself is suspended in water, but it is surprising to use non-dispersible cellulose having a specific average degree of polymerization.
  • the present inventors have found that a pigment dispersion paste that can be easily produced by a normal pigment dispersion process, has excellent storage stability, and has excellent salt resistance and water resistance when formed into a coating material has been achieved. That is, the present invention uses a non-dispersible specific cellulose having a specific average degree of polymerization, a pigment dispersion paste for electrodeposition paint having high storage stability, excellent salt resistance and water resistance, and a method for producing the same Is to provide. That is, the present invention is as follows.
  • a method for producing a pigment dispersion paste (5) An electrodeposition paint comprising the pigment dispersion paste according to any one of (1) to (3). (6) An electrodeposition paint containing a pigment-dispersed paste in which a 500 ml graduated cylinder conforming to JIS-R-3505 is charged with an electrodeposition paint up to a scale of 500 ml and the precipitate after being allowed to stand for 200 hours settles at a height of 3 mm or more. Wearing paint.
  • the present invention it is possible to provide a pigment dispersion paste having high storage stability and excellent salt resistance and water resistance when used in a paint, and an efficient method for producing the pigment dispersion paste.
  • the non-dispersible cellulose used in the present invention is mainly composed of cellulose.
  • cellulose materials such as wood pulp and refined linter are dissolved by acid hydrolysis, alkaline oxidative decomposition, enzymatic decomposition, etc.
  • Cellulose obtained by polymerization treatment is substantially free of a composite component (the definition of the composite component will be described later), has an average degree of polymerization of more than 100 and not more than 230, and a cellulose concentration of 1
  • a composite component the definition of the composite component will be described later
  • the average degree of polymerization here means that measured by the method of confirmation test (3) of crystalline cellulose defined by the 15th revision Japanese Pharmacopoeia.
  • the term “substantially free” as used herein means that the composite component in cellulose is 1% by mass or less.
  • the average degree of polymerization of the cellulose of the present application is more than 100 and 230 or less. By setting the average polymerization degree to more than 100, an increase in water-soluble components can be suppressed, the water resistance is not affected, the aggregation is hardly caused, and the storage stability is excellent. By setting the average degree of polymerization to 230 or less, the effects of the present invention are obtained, and in addition, the occurrence of unevenness in the coating film is less likely to occur.
  • the preferred average degree of polymerization is 110 to 200, more preferably 120 to 170.
  • the volume average particle size of the non-dispersible cellulose used in the present invention is preferably 1 to 500 ⁇ m.
  • the volume average particle size here is dispersed in pure water so that the cellulose concentration is 1% by mass with an Excel auto homogenizer (ED-7 type, manufactured by Nippon Seiki Co., Ltd.) at 15000 rpm for 5 minutes.
  • the analysis of the volume average particle diameter means a value at which the integrated volume is 50% when measured with a laser diffraction scattering apparatus (LA-910, manufactured by Horiba, Ltd.) with a relative refractive index of 1.2 and with ultrasonic waves.
  • cellulose having a small volume average particle size has a high production cost and the volume average particle size is small. Is generally difficult to obtain or very expensive.
  • the non-dispersible cellulose used in the present invention has an excellent effect that even when the volume average particle size is large, the influence on the coating film when used in an electrodeposition coating is small.
  • a cellulose having a volume average particle size of 10 to 150 ⁇ m, which is readily available and inexpensive, is more preferable, and a cellulose having a volume average particle size of 15 to 90 ⁇ m is most preferable.
  • the hydrophilic polymer is contained in the cellulose composite in an amount exceeding 10% by mass. Due to the presence of the hydrophilic polymer, cellulose is easily dispersed to the level of fine particles, and exhibits a function of stabilizing the suspension and imparting redispersibility.
  • the obtained pigment dispersion exhibits a suspension stability function and a redispersibility imparting function that exceed those when a cellulose composite is used.
  • the composite component is substantially not included and the average degree of polymerization exceeds 100, as compared with the case where a cellulose complex of sodium carboxymethylcellulose, which is a hydrophilic polymer, and titanium oxide are dispersed in a bead mill in the presence of water. Since the present inventor has found that the suspension stability function and the redispersibility imparting function are surprisingly better when the bead mill dispersion of 230 or less cellulose, sodium carboxymethyl cellulose and titanium oxide is present in the presence of water. is there.
  • an X-shape having a length of 100 mm is formed on a coating surface of a coated plate on which the paint is applied with a thickness of 20 ⁇ m with a cutter knife having a blade thickness of 0.38 mm.
  • the composite component refers to a component that forms a composite with cellulose and does not volatilize at 100 ° C.
  • components that can be complex components include carboxymethylcellulose and salts thereof, xanthan gum, caraya gum, carrageenan, gum arabic, glucomannan, gellan gum, alginic acid and salts thereof, and hydrophilic polymers such as propylene glycol alginate. It is done. Since the composite component in the present invention refers to a composite with cellulose, it does not include a simple mixture of components that can be composite components with cellulose.
  • the above-mentioned components that can be complex components are simply mixed with the cellulose powder that can be determined not to be complexed by determining whether the components that can be complexed with cellulose to be described later are complex.
  • Those included in the non-dispersible cellulose as defined in the present invention are substantially free from a composite component and have an average degree of polymerization of more than 100 and 230 or less.
  • a component that can form a complex with cellulose can be determined based on whether it can be a stable aqueous dispersion, and it can be determined by a general dispersion using a high-speed stirrer or homogenizer. It can be judged by operating and measuring the particle size of cellulose. For example, a high-speed stirrer such as an Excel auto homogenizer (Nippon Seiki Co., Ltd.) is added to pure water so that the cellulose composition containing a component that can be a composite component is 1% by mass of cellulose with respect to pure water. This is determined by measuring the volume average particle diameter of cellulose in the liquid after the dispersion operation for 5 minutes at 15000 rpm.
  • a high-speed stirrer such as an Excel auto homogenizer (Nippon Seiki Co., Ltd.) is added to pure water so that the cellulose composition containing a component that can be a composite component is 1% by mass of cellulose with respect to pure water. This is determined by measuring the volume average particle diameter of
  • the liquid after the dispersion operation is a value (volume average particle diameter) at which the integrated volume is 50% when measured at a relative refractive index of 1.2 with a laser diffraction scattering apparatus (LA-910, manufactured by Horiba, Ltd.) immediately after the dispersion operation. If it is 10 ⁇ m or less, a stable aqueous dispersion can be obtained, so that it can be determined that the component that can be a complex component forms a complex. In this case, since the component that can be a composite contained in the cellulose composition can be said to be a composite component, it is a cellulose composite and is different from the non-dispersible cellulose in the present invention.
  • the non-dispersible cellulose of the present invention does not disperse stably in the dispersing operation, and thus precipitates with time. Therefore, it is necessary to carry out a dispersion operation and to analyze before sedimentation occurs. After the dispersion operation, put it into the laser diffractometer within 10 seconds for analysis, or before putting it in the laser diffractometer, make the liquid after dispersion operation seem to be uniformly dispersed by stirring or shaking. It is necessary to measure.
  • the content of the non-dispersible cellulose is 0.3 to 20 parts by mass with respect to 100 parts by mass of the pigment.
  • the suspension stability and the redispersibility imparting function which are the effects of the present invention, can be sufficiently obtained.
  • Suspension stability and redispersibility imparting function tend to improve as the content of non-dispersible cellulose increases with respect to the pigment, but having a mass of 20 parts by mass or less greatly affects the color of the pigment. Does not affect.
  • the content of non-dispersible cellulose is preferably 0.5 to 10 parts by mass, more preferably 1 to 5 parts by mass.
  • the pigment used in the present invention is not particularly limited, and the shape of the pigment is not particularly limited, such as a plate shape, a spherical shape, or a scale shape, and can be used.
  • Anti-corrosive pigments such as bismuth silicate, hydrotalcite, zinc dust, mica-like iron oxide, calcium carbonate, barium sulfate, alumina white, silica, diatomaceous earth, kaolin, talc, clay, mica, barita, organic bentonite, white Body pigments such as carbon, titanium dioxide, zinc white, antimony oxide, lithopone, lead white, carbon black, iron black, composite metal oxide black, perylene black, molybdenum red
  • the primary volume average particle diameter of the pigment is preferably 10 ⁇ m or less. More preferably, it is 5 ⁇ m or less. If it is 10 micrometers or less, there is no possibility that dispersion stability will fall and the smoothness of a coating film may not be impaired. Although there is no restriction
  • the pigment content in the pigment dispersion paste is 5% by mass to 60% by mass, preferably 10% by mass to 50% by mass. By setting the content to 5% by mass or more, the pigment content is not too low, and it can be used for paints. On the other hand, the viscosity of a paste does not become too high by making content of a pigment 60 mass% or less.
  • the pigment dispersion paste of the present invention contains at least one kind of resin.
  • the resin in the present invention is preferably an anionic or cationic resin having a charge.
  • the resin include an aqueous acrylic resin, a modified acrylic resin, an aqueous urethane resin, an aqueous acrylic urethane resin, an aqueous vinyl chloride resin, an aqueous vinyl acetate resin, an aqueous epoxy resin, an aqueous polyester resin, an aqueous alkyd resin, an aqueous polyamide resin, and an aqueous resin.
  • Cellulosic resins can be used.
  • an amino group-containing epoxy resin such as a tertiary amine type, or a pigment dispersion resin such as a quaternary ammonium salt type epoxy resin or a quaternary ammonium salt type resin is preferable.
  • a synthetic polymer emulsion can be used as the resin.
  • synthetic polymer emulsions include styrene-butadiene copolymer latex, polystyrene polymer latex, polybutadiene polymer latex, acrylonitrile-butadiene copolymer latex, polyurethane polymer latex, polymethyl methacrylate heavy polymer.
  • Polymer latex methyl methacrylate-butadiene copolymer latex, polyacrylate polymer latex, vinyl chloride polymer latex, vinyl acetate polymer emulsion, vinyl acetate-ethylene copolymer emulsion, polyethylene emulsion, carboxy-modified styrene Examples thereof include butadiene copolymer resin emulsions and acrylic resin emulsions.
  • Examples of the monomer constituting the resin include aliphatic conjugated dienes such as butadiene, isoprene and 2-chloro-1,3-butadiene, aromatic vinyl compounds such as styrene, ⁇ -methylstyrene and vinyltoluene, Methacrylic acid alkyl esters such as methyl methacrylate, ethyl methacrylate and butyl methacrylate, alkyl acrylates such as ethyl acrylate, butyl acrylate and 2-ethylhexyl acrylate, vinyl cyanides such as acrylonitrile and methacrylonitrile Examples of the compound include vinyl acetate, vinyl chloride, vinylidene chloride, urethane, and ethylene.
  • ethylenically unsaturated carboxylic acids such as itaconic acid, fumaric acid, acrylic acid, methacrylic acid and crotonic acid.
  • the content of the resin in the pigment dispersion paste is 0.1 to 30% by mass, preferably 0.12 to 15% by mass. By setting the resin content to 0.1% by mass or more, the suspension stability function of the pigment-dispersed paste using the non-dispersible cellulose according to the present invention is sufficiently exhibited. On the other hand, when the content of the resin is 30% by mass or less, the viscosity of the pigment dispersion paste does not become too high, and the production does not become difficult.
  • the pigment dispersion paste of the present invention may further contain an additive as necessary.
  • Additives include pigment dispersants such as surfactants, polydimethylsiloxane, modified silicone compounds, antifoaming agents such as fatty acid esters, thickeners such as polyacrylic acid polymers, polyamides, and organic clays, dibutyltin laurate, dibutyl Organic tin compounds such as tin oxide, dibutyltin oxide, dioctyltin oxide, dibutyltin dibenzoate, amines such as N-methylmorpholine, curing catalysts such as metal salts such as lead acetate, strontium, copper, cobalt, organic copper, Preservatives such as organic tin, organic halogen, phenol and amine compounds, light resistance improvers / ultraviolet absorbers such as benzophenone, benzothiazole, oxalic anilide, hindered amine compounds, phenolic compounds and thioether compounds, anionic
  • Matting agent such as polymer beads, polyethylene Anti-scratching / non-adhesive agents such as silicone wax, paraffin wax and fluorine wax, anti-color-coding agents such as silicone oil, surfactants, wetting agents such as alkyl phosphate esters and polyamides, and organic solvents such as alcohols. .
  • an appropriate amount is used depending on the intended use / function of an additive comprising one or a combination of two or more selected from these.
  • organic solvent examples include one or two selected from hydrocarbons, alcohols, polyhydric alcohols, derivatives of polyhydric alcohols, ketones, esters, ethers and carbonates.
  • species or more is mentioned.
  • hydrocarbons examples include xylene, toluene, hexane, cyclohexane, mineral spirit, turpentine oil, sorben naphtha, and the like.
  • alcohols include methanol, ethanol, n-propanol, n-butanol, n-pentanol, n-hexanol, n-heptanol, n-octanol, n-nonyl alcohol, n-decanol, n-undecanol, and these Isomers, cyclopentanol, cyclohexanol and the like.
  • Polyhydric alcohols include ethylene glycol, propylene glycol, 1,3-butylene glycol, 1,4-butylene glycol, 1,5-pentanediol, neopentyl glycol, 1,6-hexanediol, 1,2-cyclohexane Examples include diol, 1,7-heptanediol, 1,8-octanediol, 1,9-nonanediol, 1,10-decanediol, glycerin, pentaerythritol and the like.
  • Polyhydric alcohol derivatives include ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monopropyl ether, ethylene glycol isopropyl ether, ethylene glycol monobutyl ether, ethylene glycol isobutyl ether, propylene glycol monomethyl ether, propylene glycol monoethyl Examples include ether, propylene glycol monopropyl ether, propylene glycol monobutyl ether, and cellosolve acetate.
  • ketones include acetone, methyl ethyl ketone, methyl butyl ketone, methyl isobutyl ketone, diisopropyl ketone, cyclopentanone, and cyclohexanone.
  • Esters include methyl acetate, ethyl acetate, propyl acetate, isopropyl acetate, butyl acetate, isobutyl acetate, amyl acetate, lactic acid ester, butyric acid ester, dibutyl phthalate, dioctyl phthalate, and cyclic such as ⁇ -caprolactone and ⁇ -caprolactam Examples include esters.
  • ethers include diethyl ether, isopropyl ether, n-butyl ether, tetrahydrofuran, tetrahydropyran, 1,4-dioxane and the like.
  • carbonates examples include dimethyl carbonate, diethyl carbonate, ethyl methyl carbonate, and ethylene carbonate.
  • the pigment dispersion paste of the present invention can be obtained by pulverizing and mixing a pigment, non-dispersible cellulose having a specific average polymerization degree, a resin, and a dispersion medium (usually water) with a bead mill.
  • the bead mill here is a wet medium agitation mill that refines a slurry in which powder and liquid are mixed, filled with beads (media) in a container, rotated, put a raw slurry, An apparatus that grinds and disperses raw materials. SG mill, ball mill, and the like, which are similar mechanisms, are filled with media and rotated to pulverize and disperse the raw material, and are included in the bead mill referred to in this application.
  • the pigment dispersion paste of the present invention has high storage stability and does not deteriorate the salt resistance and water resistance even if it is a paint. It can be suitably used for paint.
  • the coating method is not particularly limited, such as electrodeposition coating, spray coating, and brush coating. Among these, since the electrodeposition paint has a low viscosity and tends to precipitate when the stirring is stopped, the pigment dispersion paste of the present invention having good suspension stability can be used very usefully.
  • the pigment dispersion paste of the present application is used for an electrodeposition paint, it may be used in the same manner as a pigment paste (F1) of a general electrodeposition paint.
  • the resin dispersion (F2) may be a general one.
  • the resin used for the resin dispersion (F2) is not particularly limited, and a resin used for a normal electrodeposition paint may be used. The most common is a modified epoxy resin.
  • the electrodeposition paint of the present application is excellent in redispersibility. For example, when the electrodeposition paint using the pigment paste of the present invention is placed in a 500 ml graduated cylinder conforming to JIS-R-3505 up to a scale of 500 ml and allowed to stand for 200 hours, the sediment is soft at a height of 3 mm or more.
  • the pigment dispersion paste of the present invention is most effective in electrodeposition paints, but can be used not only in electrodeposition paints but also in inks in which pigments are dispersed. It is.
  • a steel plate (size: 0.8 ⁇ 70 ⁇ 150 mm, plain steel (SPCC), surface treatment; phosphate treatment PB-L3020) is immersed in the electrodeposition paint and applied at room temperature as a cathode. Electrodeposition coating was performed with a film thickness of 20 ⁇ m under the condition of a voltage of 250 V, washed with water, and baked at 160 ° C. for 10 minutes to prepare a test coating plate.
  • SPCC plain steel
  • phosphate treatment PB-L3020 surface treatment
  • Electrodeposition coating was performed with a film thickness of 20 ⁇ m under the condition of a voltage of 250 V, washed with water, and baked at 160 ° C. for 10 minutes to prepare a test coating plate.
  • Example 1 Comparative Example 1, Comparative Example 2
  • 40 parts by mass of titanium oxide as a pigment 0.1 part by mass of sodium carboxymethylcellulose as a water-soluble anionic resin, 1 part by mass of cellulose (Example 1 or Comparative Example 1) or cellulose composite (Comparative Example 2), 39 masses of water
  • the parts were mixed and treated with a bead mill (RMB-400, bead diameter 1 mm, manufactured by Imex Co., Ltd.) for 60 minutes to obtain a pigment dispersion paste.
  • RMB-400 bead diameter 1 mm, manufactured by Imex Co., Ltd.
  • the cellulose of Example 1 has an average degree of polymerization of 167 and a volume average particle size of 19 ⁇ m and does not substantially contain a composite component (that is, non-dispersible cellulose), and the cellulose of Comparative Example 1 has an average degree of polymerization of 241 and a volume.
  • Example 1 showed good suspension stability, but Comparative Example 1 was very poor in suspension stability and Comparative Example 2 was also better than Comparative Example 1, but worse than Example 1.
  • Example 1 since no sedimentation was observed, the redispersibility could not be evaluated.
  • Comparative Example 1 since the average degree of polymerization of cellulose was large, in Comparative Example 2, the function was poor because cellulose was a cellulose composite.
  • Example 2 120 parts by mass of an epoxy-based quaternary ammonium salt type pigment dispersion resin (cationic resin) of 35% by mass, 100 parts by mass of kaolin, 2 parts by mass of carbon black, 8 parts by mass of dibutyltin oxide, phosphomolybdenum 18 parts by weight of aluminum oxide, 184 parts by weight of deionized water, average degree of polymerization 154, volume average particle size 22 ⁇ m, 1 part by weight of cellulose (ie non-dispersible cellulose) substantially free of complex components, and SG for water-soluble components Dispersion and mixing were performed with a mill to obtain pigment dispersion paste A (29.6% by mass of pigment, 9.7% by mass of resin, and 0.78 parts by mass of cellulose with respect to 100 parts by mass of pigment).
  • an epoxy-based quaternary ammonium salt type pigment dispersion resin cationic resin
  • 100 parts by mass of kaolin 100 parts by mass of kaolin, 2 parts by mass of carbon black, 8 parts by mass of di
  • an electrodeposition paint using the pigment dispersion paste obtained by the above-described manufacturing method was produced.
  • a separate container 145 parts by mass of deionized water and 5 parts by mass of acetic acid were weighed, and at 70 ° C., 320 parts by mass of amine-modified epoxy resin (solid content 75 parts by mass), 190 parts by mass of blocked isocyanate curing agent (solid content 25 parts by mass). Part) was added slowly with vigorous stirring and dispersed uniformly. Further, deionized water was added to obtain an emulsion having a solid content of 36% by mass.
  • Electrodeposition paints A, B, C, and D were immersed in a steel plate, electrodeposited with a film thickness of 20 ⁇ m under the condition of an applied voltage of 250 V at room temperature as a cathode, washed with water, and then washed at 160 ° C. for 10 minutes. Baking was performed. Electrodeposition paints A, B, C and D and their coatings were evaluated. The evaluation results are shown in Table 2.
  • Example 2 both the pigment dispersion paste and the electrodeposition paint using the same had good suspension stability and redispersibility, and the coating film had good salt resistance and water resistance.
  • Comparative Examples 3 and 4 as compared with Comparative Example 5 in which no cellulose was used, both the suspension stability and redispersibility of the pigment dispersion paste and the electrodeposition paint using the same were good. Comparative Example 3 was better than Comparative Example 4, but not as well as Example 2. On the other hand, Comparative Examples 3 and 4 had poor salt resistance and water resistance after coating.
  • the pigment-dispersed paste of the present invention has good storage stability, and when used as a paint, has high salt resistance and water resistance, and therefore can be suitably used for an electrodeposition paint.

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Organic Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Molecular Biology (AREA)
  • Pigments, Carbon Blacks, Or Wood Stains (AREA)
  • Paints Or Removers (AREA)

Abstract

L'invention concerne une pâte de dispersion de pigment contenant de 5 à 60 % en masse d'un pigment et de 0,1 à 30 % en masse d'une résine, ladite pâte de dispersion de pigment contenant également, pour 100 parties en masse du pigment, de 0,3 à 20 parties en masse d'une cellulose de non dispersion ayant un degré moyen de polymérisation de plus de 100 et de 230 ou moins.
PCT/JP2012/063422 2011-05-26 2012-05-25 Pâte de dispersion de pigment et son procédé de fabrication WO2012161299A1 (fr)

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JP2013189524A (ja) * 2012-03-13 2013-09-26 Shinto Paint Co Ltd カチオン性電着塗料組成物
JP2014513170A (ja) * 2011-04-01 2014-05-29 オムヤ インターナショナル アーゲー 自己結合顔料粒子を調製する方法
JP2014514393A (ja) * 2011-04-01 2014-06-19 オムヤ インターナショナル アーゲー 自己結合顔料ハイブリッド
JP2015157908A (ja) * 2014-02-24 2015-09-03 東洋インキＳｃホールディングス株式会社 シリカ分散体
JP2017090720A (ja) * 2015-11-11 2017-05-25 株式会社有沢製作所 着色感光性樹脂組成物

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