EP1333940A2 - Verfahren zur erzeugung einer mehrschichtlackierung und deren verwendung - Google Patents
Verfahren zur erzeugung einer mehrschichtlackierung und deren verwendungInfo
- Publication number
- EP1333940A2 EP1333940A2 EP01988632A EP01988632A EP1333940A2 EP 1333940 A2 EP1333940 A2 EP 1333940A2 EP 01988632 A EP01988632 A EP 01988632A EP 01988632 A EP01988632 A EP 01988632A EP 1333940 A2 EP1333940 A2 EP 1333940A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- temperature
- layer
- predrying
- filler
- electrocoat
- 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.)
- Granted
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/50—Multilayers
- B05D7/52—Two layers
- B05D7/54—No clear coat specified
- B05D7/544—No clear coat specified the first layer is let to dry at least partially before applying the second layer
Definitions
- the invention relates to a method for producing a multilayer coating on an electrically conductive substrate, an electrocoating film being deposited on the substrate, the electrocoating film being predried by heating to a predrying temperature, a layer of a filler being applied to the electrocoating film, and the electrocoating film and the layer of the filler are baked together at elevated temperatures, and the use of the multilayer coatings obtained in this way.
- the invention further relates to a method for determining the predrying temperature of the electrocoat material in a method of the type mentioned at the beginning by means of the dynamic mechanical termo analysis (DMTA).
- DMTA dynamic mechanical termo analysis
- the DMTA is known, for example, from German patent application DE 44 09 715 A1. There it is used for the quantitative description of the chemical crosslinking reactions in lacquer films that have been deposited on fabric tapes with a defined mechanical property profile. Electrodeposition paints can also be deposited and examined by using electrically conductive fabric tapes.
- DE 44 09 715 A1 does not describe a determination of the predrying temperature of the electrocoat films by means of DMTA.
- the process of so-called wet-in-wet application of electrocoat paint (ETL) and at least one other paint layer is used to produce multi-layer coatings with a primer from an electrocoat and an overcoat 660A 1, EP 0 595 186 A 1, EP 0 646 420 A 1 or DE 41 26 476 A 1.
- the lacquers which are applied “wet-on-wet” can be liquid (aqueous, conventional or powder slurry) or powder-like.
- the lacquers can be pigmented and unpigmented and the preparation of Fillers or functional layers (pigmented) or clear coats (unpigmented), but especially the production of fillers.
- the applied electrocoating film is generally predried before the next paint is applied. This is usually done under conditions under which water and solvents are largely evaporated from the electrocoat film. This approach is ecologically and economically advantageous and also generally provides better quality coatings.
- electro-dip lacquers and powder lacquers are used, the baking temperatures of which are matched to one another.
- the interval of the minimum baking temperature of the second coating layer (powder coating layer) should be above the interval of the first coating layer (electrocoat) or the intervals should overlap so that the lower limit of the interval of the minimum baking temperature of the second coating layer is above the lower limit of the Interval of the electrocoat is.
- the electrodeposition paint has a stoving temperature that is lower than the stoving temperature of the powder coating.
- the improved appearance should be expressed particularly significantly in the values of a long wave / short wave wave scan (light reflection), which provides a value for the amount of scattered light.
- the rockfall protection properties are to be improved.
- Another aspect of the present invention is the use of the multi-layer coating in automobile painting and in industrial painting.
- This object is achieved by a method for producing a multi-layer coating on a substrate or by using this multi-layer coating, wherein
- an electrodeposition film is deposited on the substrate, b) the electrocoat film is pre-dried by heating to a predrying temperature of the electrocoat material for a predetermined period of time,
- the process is characterized in that the predrying temperature is equal to or above, preferably 0 ° C to 35 ° C and preferably 5 ° C to 25 ° C, above the temperature T p at which the loss factor tan ⁇ of the not yet baked (ie uncrosslinked ) Electro dip coating shows a maximum.
- the energy portion (elastic portion) of a polymer to be recovered is determined by the size of the storage module E ', while the energy (dissipated) energy portion consumed in this process is described by the size of the loss module E ".
- the modules E' and E" are of the rate of deformation and the temperature.
- the loss factor tan ⁇ is defined as the quotient of the loss module E ′′ and the storage module E ′. Tan ⁇ can be determined with the aid of dynamic mechanical thermal analysis (DMTA) and represents a measure of the relationship between the elastic and plastic properties of electrocoating paint (Th. Frey, K.-H. tenue-Brinkhaus, U. Röckrath: Cure Monitoring Of Thermoset Coatings, Progress In Organic Coatings 27 (1996) 59-66).
- DMTA dynamic mechanical thermal analysis
- the predrying temperature according to the invention is maintained, an improved surface quality can be observed (appearance of the overall structure, including clearcoat). This is expressed e.g. in the values of a long wave / short wave wavescans (light reflection), which provides a value for the amount of scattered light.
- the flow of the paint is also improved.
- the optimum predrying temperature for a given electrocoat material - regardless of whether it is comparatively high or comparatively low - can be determined in a simple manner.
- the predetermined time period for carrying out the predrying in step b) is typically 1 to 60 minutes, preferably 5 to 15 minutes.
- the substrate is preferably returned to the ambient temperature before the filler is applied. The time between the electrodeposition coating and the filler application is freely selectable.
- the layer of a filler applied in step c) is predried for about 1 to 30 minutes, preferably for 10 to 20 minutes, before the joint baking in step d).
- This predrying takes place at a temperature which is dependent on the filler material, so that the person skilled in the art can easily determine the optimum temperature on the basis of his general specialist knowledge, possibly with the aid of orienting tests.
- the thickness of the cured electrocoat film is preferably 10 ⁇ m to 30 ⁇ m, particularly preferably 15 ⁇ m to 20 ⁇ m.
- the thickness of the hardened filler layer depends on the filler material and is preferably 10 ⁇ m to 60 ⁇ m.
- electrocoating baths are aqueous coating materials (ETL) with a solids content of in particular 5 to 30% by weight.
- ETL aqueous coating materials
- the solid of the ETL consists of
- binders which carry ionic groups or functional groups (a1) which can be converted into ionic groups and functional groups (a2) capable of chemical crosslinking, wherein they are externally and / or self-crosslinking, but especially crosslinked externally;
- B if appropriate crosslinking agents which carry complementary functional groups (bl) which can undergo chemical crosslinking reactions with the functional groups (a2) and are then used compulsorily if the binders (A) are externally crosslinking; such as
- crosslinking agents (B) and / or their functional groups (bl) have already been incorporated into the binders (A), one speaks of self-crosslinking.
- the complementary functional groups (a2) of the binders (A) are preferably thio, aminino, hydroxyl, carbamate, allophanate, carboxy, and / or (meth) acrylate groups, but especially hydroxyl groups, and complementary functional groups ( bl) preferably anhydride, carboxy, epoxy, blocked isocyanate, urethane, methylol, methylol ether, siloxane, amino, hydroxy and / or beta-hydroxyalkylamide groups, but especially blocked isocyanate groups.
- Suitable ionic groups or functional groups (a1) of the binders (A) which can be converted into ionic gums are
- binders (A) with functional groups (A1) are used in cathodically depositable electrocoat materials (KTL), whereas the binders
- (A) with functional groups (al2) can be used in anodic electrocoating materials (ATL).
- Suitable functional groups (A1) to be used according to the invention which can be converted into cations by neutralizing agents and / or quaternizing agents, are primary, secondary or tertiary amino groups, secondary sulfide groups or tertiary phosphine groups, in particular tertiary amino groups or secondary sulfide groups.
- Suitable cationic groups (A1) to be used according to the invention are primary, secondary, tertiary or quaternary ammonium groups, tertiary sulfonium groups or quaternary phosphonium groups, preferably quaternary ammonium groups or quaternary ammonium groups, tertiary sulfonium groups, but especially quaternary ammonium groups.
- Suitable functional groups (al2) to be used according to the invention which can be converted into anions by neutralizing agents, are carboxylic acid, sulfonic acid or phosphonic acid groups, in particular carboxylic acid groups.
- Suitable anionic groups (al2) to be used according to the invention are carboxylate, sulfonate or phosphonate groups, in particular carboxylate groups.
- Suitable neutralizing agents for functional groups (all) which can be converted into cations are inorganic and organic acids such as sulfuric acid, hydrochloric acid, phosphoric acid, amidosulfonic acid, lactic acid, dimethylolpropionic acid or citric acid, in particular formic acid, acetic acid or lactic acid.
- Suitable neutralizing agents for functional groups (al2) which can be converted into anions are ammonia, ammonium salts, such as, for example, ammonium carbonate or ammonium hydrogen carbonate, and amines, such as, for example, Trimethylamine, triethylamine, tributylamine, dimethylaniline, diethylaniline, triphenylamine, dimethylethanolamine, diethylethanolamine, methyldiethanolamine, triethanolamine and the like.
- the amount of neutralizing agent is chosen so that 1 to 100 equivalents, preferably 50 to 90 equivalents, of the functional groups (all) or (a! 2) of the binder (bl) are neutralized.
- binders (A) for ATL are known from patent specification DE 28 24 418 A1. These are preferably polyesters, epoxy resin esters, poly (meth) acrylates, maleinatols or polybutadiene oils with a weight average molecular weight of 300 to 10,000 daltons and an acid number of 35 to 300 mg KOH / g.
- Suitable binders (A) for KTL are from the patents EP 0 082 291 A1, EP 0 234 395 A1, EP 0 227 975 A1, EP 0 178 531 A1, EP 0 333 327, EP 0 310 971 A.
- Amino (meth) acrylate resins, amino epoxy resins, amino epoxy resins with terminal double bonds, amino epoxy resins with primary and / or secondary hydroxyl groups, amino polyurethane resins, amino group-containing polybutadiene resins or modified epoxy resin-carbon dioxide-amine reaction products are preferably used.
- Modified epoxy resins according to WO 98/33835 which can be obtained by reacting an epoxy resin with a mixture of mono- and diphenols, the resulting product with a polyamine to an aminoepoxy resin, after which the resulting aminoepoxy resin can react in a further step with an organic amine to give the modified epoxy resin (cf. WO 98/33835, page 19, line 1, to page 21, line 30).
- KTL in particular KTL based on the above-described binders (A) and the corresponding electro dip baths are preferably used.
- the ETL preferably contain crosslinking agents (B).
- Suitable, preferably used crosslinking agents (B) are blocked organic polyisocyanates, in particular blocked so-called
- Lacquer polyisocyanates with aliphatic, cycloaliphatic, araliphatic and / or aromatically bound, blocked isocyanate groups are preferably used for their preparation.
- Polyisocyanates having 2 to 5 isocyanate groups per molecule and having viscosities of 100 to 10,000, preferably 100 to 5000 and in particular 100 to 2000 mPas (at 23 ° C.) are preferably used for their preparation.
- the polyisocyanates can be modified in a conventional and known manner to be hydrophilic or hydrophobic.
- polyisocyanate adducts examples include polyurethane prepolymers containing isocyanate groups, which can be prepared by reacting polyols with an excess of polyisocyanates and are preferably low-viscosity.
- Polyisocyanates containing isocyanurate, biuret, allophanate, iminooxadiazinedione, urethane, urea carbodiimide and / or uretdione groups can also be used.
- Polyisocyanates containing urethane groups are obtained, for example, by reacting some of the isocyanate groups with polyols, e.g. Trimethylolpropane and glycerin.
- Polyisocyanate adducts based on hexamethylene diisocyanate such as those formed by catalytic oligomerization of hexamethylene diisocyanate using suitable catalysts.
- the polyisocyanate component can also consist of any mixtures of the free polyisocyanates mentioned by way of example.
- blocking agents for the preparation of the blocked polyisocyanates (B) are the blocking agents known from US Pat. No. 4,444,954 A or US Pat. No. 5,972,189 A, such as i) phenols such as phenol, cresol, xylenol, nitrophenol, chlorophenol,
- lactams such as ⁇ -caprolactam, ⁇ -valerolactarn. ⁇ -butyrolactam or ß-propiolactam;
- active methylenic compounds such as diethyl malonate, dimethyl malonate, ethyl or methyl acetoacetate or
- alcohols such as methanol, ethanol, n-propanol, isopropanol, n-butanol, isobutanol, t-butanol, n-amyl alcohol, t-amyl alcohol, lauryl alcohol, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether,
- Glycolic acid ester lactic acid, lactic acid ester, methylol urea, methylolmelainin, diacetone alcohol, ethylene chlorohydrin,
- mercaptans such as butyl mercaptan, hexyl mercaptan, t-butyl mercaptan, t-dodecyl mercaptan, 2-mercaptobenzothiazole, thiophenol,
- Methylfhiophenol or ethylthiophenol vi) acid amides such as acetoanilide, acetoanisidinamide, acrylamide, methacrylamide, acetic acid amide, stearic acid amide or benzamide;
- imides such as succinimide, phthalimide or maleimide
- amines such as diphenylamine, phenylnaphthylamine, xylidine, N-
- Phenylxylidine carbazole, aniline, naphthylamine, butylamine, dibutylamine or butylphenylamine;
- imidazoles such as imidazole or 2-ethylimidazole
- ureas such as urea, thiourea, ethylene urea, ethylene thiourea or 1,3-diphenyl urea;
- xi) carbamates such as phenyl N-phenylcarbamate or 2-oxazolidone
- imines such as ethyleneimine
- oximes such as acetone oxime, formaldoxime, acetaldoxime, acetoxime, methyl ethyl ketoxime, diisobutyl ketoxime, diacetyl monoxün,
- xiv) salts of sulfurous acid such as sodium bisulfite or potassium bisulfite
- xv) hydroxamic acid esters such as benzyl methacrylohydroxamate (BMH) or allyl methacrylohydroxamate; or
- substituted pyrazoles such as Mixtures of these blocking agents, in particular dimethylpyrazole and triazoles, malonic esters and acetoacetic acid esters, dimethylpyrazole and succinimide or butyl diglycol and trimethylol propane.
- crosslinking agents (B) are all known aliphatic and / or cycloaliphatic and / or aromatic polyepoxides, for example based on bisphenol-A or bisphenol-F.
- polyepoxides are, for example, the polyepoxides commercially available under the names Epikote® from Shell, Denacol® from Nagase Chemicals Ltd., Japan, such as Denacol EX-411
- Tris (alkoxycarbonylamino) triazines (TAGT) of the general formula can also be used as crosslinking agents (B)
- tris (alkoxycarbonylamino) triazines (B) examples include butoxy and / or tris (2-ethylhexoxycarbonylamino) triazines.
- methyl-butyl mixed esters, the butyl-2-ethylhexyl mixed esters and the butyl esters are advantageous. Compared to the pure methyl ester, these have the advantage of better solubility in polymer melts and also have less tendency to crystallize out.
- crosslinking agents (B) are aminoplast resins, for example melamine, guanamine, benzoguanamine or urea resins.
- the usual and known aminoplast resins come into consideration, the methylol and / or methoxymethyl groups z. T. are defunctionalized by means of carbamate or allophanate groups.
- Crosslinking agents of this type are described in US Pat. No. 4,710,542 A and EP 0 245 700 B1 as well as in the article by B. Singh and co-workers "Carbamylmethylated Melamines, Novel Crosslinkers for the Coatings Industry" in Advanced Organic Coatings Science and Technology Series, 1991 , Volume 13, pages 193 to 207.
- crosslinking agents (B) are beta-hydroxyalkylamides such as N, N, N ', N'-tetrakis (2-hydroxyethyl) adipamide or N, N, N', N'-tetrakis (2-hydroxy ⁇ ropyl) adipamide.
- crosslinking agents (B) are compounds having an average of at least two groups capable of transesterification, for example reaction products of malonic acid diesters and polyisocyanates or of esters and partial esters of polyhydric alcohols of malonic acid with monoisocyanates, as described in European Patent EP 0 596 460 A1 become;
- the amount of crosslinking agent (B) in the ETL can vary widely and depends in particular on the one hand on the functionality of the crosslinking agent (B) and on the other hand on the number of crosslinking functional groups (a2) present in the binder (A) and on the crosslinking density that you want to achieve.
- the person skilled in the art can therefore determine the amount of crosslinking agent (B) on the basis of his general specialist knowledge, if necessary with the aid of simple orienting experiments.
- the crosslinking agent (B) in the ETL is advantageously in an amount of 5 to 60% by weight, particularly preferably 10 to 50% by weight and in particular 15 to 45% by weight, in each case based on the solids content of the coating material according to the invention, contain.
- crosslinking agent (B) and binder (A) are selected so that in the ETL the ratio of functional groups (bl) in the crosslinking agent (B) and functional groups (a2) in the binder (A ) is between 2: 1 to 1: 2, preferably 1.5: 1 to 1: 1.5, particularly preferably 1.2: 1 to 1: 1.2 and in particular 1.1: 1 to 1: 1.1 ,
- the ETL can contain customary paint additives (C) in effective amounts.
- organic and / or inorganic pigments, anti-corrosion pigments and / or fillers such as calcium sulfate, barium sulfate, silicates such as talc or kaolin, silicas, oxides such as aluminum hydroxide or magnesium hydroxide, nanoparticles, organic fillers such as textile fibers,
- additives (C) that can be contained in both pigmented and unpigmented ETL are examples of additives (C) that can be contained in both pigmented and unpigmented ETL.
- Crosslinking catalysts such as inorganic and organic salts and complexes of tin, lead, antimony, bismuth, iron or manganese, preferably organic salts and complexes of bismuth and tin, in particular bismuth lactate, citrate, ethylhexanoate or dimethylolpropionate, dibutyltin oxide or dibutyltin dilautyltin ;
- Emulsifiers especially non-ionic emulsifiers such as alkoxylated alkanols and polyols, phenols and alkylphenols or anionic emulsifiers such as alkali salts or ammonium salts of alkane carboxylic acids, alkane sulfonic acids, and sulfonic acids of afoxylated alkanols and polyols, phenols and alkylphenols; Wetting agents such as siloxanes, fluorine-containing compounds,
- film-forming aids such as cellulose derivatives
- polyols such as tricyclodecane dimethanol, dendrimeric polyols, hyperbranched polyesters, polyols based on metathesis oligomers or branched alkanes with more than eight carbon atoms in the molecule;
- crosslinking agents (B) and / or additives (C) described above can also be contained in the fillers described below. According to the invention, lead-free KTL offer particular advantages and are therefore used with preference.
- aminoepoxy resin can react with another polymamine to give the modified epoxy resin
- the predrying temperature in step b) is then 70 ° C. to 120 ° C., preferably 80 ° C. to 100 ° C.
- fillers or stone chip protection primers are from the patents US 4,537,926 A1, EP 0 529 335 A1, EP 0 595 186 A1, EP 0 639 660 A1, DE 44 38 504 A1, DE 43 37 961 A1, WO 89 / 10387, US 4,450,200 A1, US 4,614,683 A1, WO 94/26827 or EP 0 788 52 3 B1.
- the fillers can be conventional, ie solvent-based or aqueous coating materials.
- powder coating materials or powder coating materials can be used.
- Aqueous fillers are preferably used.
- Aqueous fillers are preferably used which contain a water-dilutable polyurethane resin as a binder.
- Aqueous fillers based on water-dilutable polyurethane resins are particularly preferred, which are obtainable by adding polyester and / or polyether polyols, polyisocyanates, compounds with at least one isocyanate-reactive group and at least one (potentially) anionic group in the molecule and, if appropriate, compounds with hydroxyl and / or amino groups are reacted with one another.
- the polyurethane resin is at least partially neutralized and dispersed in water. The dispersion is then completed with pigments and crosslinking agents (see, for example, European Patent EP 0 788 523 B1, page 5, lines 1 to 29).
- the function of the filler or the paint produced from it is the compensation of disturbing unevenness (in the micrometer range) on the surface of a substrate, so that the surface of the substrate does not need to be subjected to an equalizing pretreatment before coating with a coating.
- the comparatively high layer thickness of the filler also serves this purpose. In addition, it is used to absorb and dissipate mechanical energy, such as occurs in the event of stone chips.
- the multi-layer coating produced by the process according to the invention can be used as such for the abovementioned uses (2-layer coating). However, it can also be overcoated with a clear coat or solid-color finish, which results in a three-coat finish that offers an economical alternative to comparatively expensive coatings. For demanding uses in which a particularly good appearance is particularly important, the multi-layer coating produced by the process according to the invention can still be applied with a coloring and / or effect-imparting basecoat / clearcoat coating, preferably by the wet-on-wet method, are overcoated (4-coat coating).
- the invention further relates to a method for determining the predrying temperature of the electrocoat material in a method for producing a multi-layer coating of the type mentioned at the beginning.
- the method is characterized in that the temperature T p is determined at which a viscoelastic property of the electrocoating material which has not yet been baked on is an extremum and that the predrying temperature is chosen to be equal to or above, preferably 0 ° C. to 35 ° C. and preferably 5 ° C. to 25 ° C. above this temperature T p .
- This process is based on the knowledge that the pre-drying of an electrocoating lacquer in the wet-on-wet application of an ETL and a filler is not primarily about the evaporation of the solvents, but that it is important to exceed a temperature in which internal changes of electrodeposition lacquer take place, which are expressed in an extremum of a viscoelastic property.
- the viscoelastic property of the electrocoat material is the loss factor tan ⁇ .
- An improvement in the coating result at predrying temperatures above the maximum loss factor tan ⁇ has been demonstrated in numerous experiments.
- DMTA is a well-known measurement method for determining the viscoelastic properties of coatings and is described, for example, in Murayama, T., Dynamic Mechanical Analysis of Polymeric Materials, Elsevier, New York, 1978, pages 299 to 329 and Loren W. Hill, Journal of Coatings Technology, Vol. 64, No. 808, May 1992, pages 31 to 33.
- the process conditions when measuring tan ⁇ with the aid of DMTA are described by Th. Frey, K.-H. communale-Brinkhaus, U. Röckrath, in Cure Monitoring Of Thermoset Coatings, Progress In Organic Coatings 27 (1996) 59-66, or in DE 44 09 715 A1 described in detail.
- the particular advantages of the method according to the invention are not limited to the combination of electro-dip coating and filler coating, but also radiate onto the coatings above.
- the clear coats, solid-color coats or color and / or effect basecoat / clear coat lacquers produced thereon have an improved surface quality (appearance of the overall structure including clear lacquer). in the values of a long wave / short wave wavescans (light reflection), which provides a value for the amount of scattered light.
- the flow of the paint is also improved.
- the water of reaction is removed from a 70% solution of diethylenetriamine in methyl isobutyl ketone at 110 ° C. to 140 ° C.
- the mixture is then diluted with methyl isobutyl ketone until the solution has an amine equivalent weight of 131 g / eq.
- additive K 2000 polyether, Byk Chemie / Germany
- Plastilit® 3060 propylene glycol compound, from BASF AG
- 522 parts of propylene glycol phenyl ether mixture of 1-phenoxy-2-propanol and 2-phenoxy-1-propanol, from BASF AG
- reaction mixture After 10 minutes, 14821 parts of the reaction mixture are transferred to a dispersion vessel. 474 parts of lactic acid (88% strength in water), dissolved in 7061 parts of deionized water, are added with stirring. The mixture is then homogenized for 20 minutes before further dilution in small portions with a further 12600 parts of deionized water.
- the volatile solvents are removed by distillation in vacuo and then replaced in equal quantities by deionized water.
- the dispersion Dl has the following characteristics: Solids content: 33.8% (1 h at 130 ° C)
- Particle size 116 n (mass average from photon correlation
- BinderDispersion Dl immediately after dilution with
- Propylene glycol phenyl ether 378 parts K-KAT 348 (bismuth 2-ethylhexanoate; Fa.
- Dispersion D2 has the following key figures:
- the EEW of 532 indicates that> 98 of the phenolic OH groups have reacted.
- 157 parts of Pluriol P 600 polypropylene glycol MW 600, BASF
- 157 parts of Pluriol P 600 polypropylene glycol MW 600, BASF
- diethanolamine polypropylene glycol MW 600, BASF
- 61.2 parts of N, N-dimethylamine propylamine are added.
- Tmax 140 ° C the batch is left to react at 130 ° C for 2 hours until the viscosity remains constant.
- 97.6 parts of butylglycol and 812 parts of the crosslinking agent (V2) are added and the mixture is discharged at 105.degree.
- Dispersion D3 has the following key figures:
- an organic-aqueous solution of an epoxy-amine adduct is prepared by, in a first stage, 2598 parts of bisphenol A diglycidyl ether (epoxy equivalent weight (EEW): 188 g / eq), 787 Parts of bisphenol-A, 603 parts by weight of dodecylphenol and 206 parts of butyl glycol in the presence of 4 parts of triphenylphosphine at 130 ° C. to an EEW of 865 g / eq.
- EW epoxy equivalent weight
- the mixture is diluted with 849 parts of butyl glycol and 1534 parts of D.E.R.®732 (polypropylene glycol diglycidyl ether from DOW Chemical) and the reaction is continued at 90 ° C. with 266 parts of 2,2'-aminoethoxyethanol and 212 parts of N, N-dimethylanünopropylamine.
- the viscosity of the resin solution is constant (5.3 dPas; 40% in Solvenon® PM (methoxypropanol from BASF AG); cone and plate viscometer at 23 ° C). It is diluted with 1512 parts of butyl glycol and the base groups are partially neutralized with 201 parts of glacial acetic acid, further diluted with 1228 parts of deionized water and discharged.
- a 60% aqueous organic resin solution is thus obtained, the 10% dilution of which has a pH of 6.0.
- step 5 First, 277 parts of water and 250 parts of the epoxy-amine adduct described in step 5 are premixed. Then 5 parts of carbon black, 60 parts of extender ASP 200, 351 parts of titanium dioxide TI-PURE® R 900 (from DuPont) and 54 parts of dibutyltin oxide (Fascat 4203, Fa. Elf-Atochem) were added and mixed for 30 minutes under a high-speed dissolver stirrer. The mixture is then dispersed in a laboratory agitator mill for 1 to 1.5 hours to a Hegman fineness of 12 ⁇ m and, if necessary, adjusted to the desired processing viscosity with further water.
- carbon black 60 parts of extender ASP 200, 351 parts of titanium dioxide TI-PURE® R 900 (from DuPont) and 54 parts of dibutyltin oxide (Fascat 4203, Fa. Elf-Atochem) were added and mixed for 30 minutes under a high-speed dissolver stirrer. The mixture is then dispersed
- electrocoat binder dispersions D1-D3 were produced using the electrocoat binder dispersions D1-D3 and, if appropriate, the pigment paste (step 8):
- the electrocoat materials obtained in this way have a solids content of approximately 20% in the case of the pigmented ETL 1 system and 15% in the case of the ETL clearcoats
- the application conditions were chosen so that after a bath temperature of min. 24 h on non-passively rinsed steel panels (eg Bo 26 W 42 OC) after baking (15 min 180 ° C object temperature), smooth films with a layer thickness of approx. 20 ⁇ m were obtained.
- the process conditions for the determination of T p of the electrocoat materials using DMTA were as follows (see Th. Frey, K.-H. persistente-Brinkhaus, U. Röckrath, Cure Monitoring Of Thermoset Coatings, Progress In Organic Coatings 27 (1996 ) 59-66, or in DE 44 09 715 A 1):
- the DMTA showed a sudden, strong change in the SpeiGher module E 'and the loss factor tan ⁇ at approx. 145 ° C, which can be attributed to the beginning of the crosslinking reaction. It was also evident that below this crosslinking temperature, the loss factor tan ⁇ shows a maximum (peak) at a temperature T p of approximately 90 ° C. As could be determined by further investigations, this maximum was not due to a glass transition in the KTL material under consideration.
- the panels were not baked, but only pre-dried for 10 min at 80 ° C. or at 100 ° C. in a convection oven.
- the temperatures were chosen because of the secluded Electro-lacquer films, as described above, had a maximum of the loss factor tan ⁇ at T p > 80 ° C.
- the aqueous lacquer (step 11) with a dry film thickness of 19 ⁇ m is applied to the pre-dried KTL lacquers and pre-dried at 70 ° C. Subsequently, the KTL and the aqueous varnish are baked together for 15 min at 180 ° C object temperature.
- the panels are overpainted with a commercially available white basecoat with a dry film thickness of 18 ⁇ m and with a commercially available two-component clear lacquer with a layer thickness of 35 - 40 ⁇ m. These layers are baked at 130 ° C for 30 minutes.
- a black basecoat with a layer thickness of 14 ⁇ m is used instead of the white basecoat.
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
- Paints Or Removers (AREA)
- Epoxy Resins (AREA)
- Laminated Bodies (AREA)
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10052438A DE10052438C2 (de) | 2000-10-23 | 2000-10-23 | Verfahren zur Erzeugung einer Mehrschichtlackierung und deren Verwendung |
DE10052438 | 2000-10-23 | ||
PCT/EP2001/012102 WO2002034418A2 (de) | 2000-10-23 | 2001-10-19 | Verfahren zur erzeugung einer mehrschichtlackierung und deren verwendung |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1333940A2 true EP1333940A2 (de) | 2003-08-13 |
EP1333940B1 EP1333940B1 (de) | 2005-12-28 |
Family
ID=7660707
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01988632A Expired - Lifetime EP1333940B1 (de) | 2000-10-23 | 2001-10-19 | Verfahren zur Bestimmung der Vortrocknungstemperatur eines Elektrotauchlacks |
Country Status (8)
Country | Link |
---|---|
US (1) | US7087146B2 (de) |
EP (1) | EP1333940B1 (de) |
JP (1) | JP4292007B2 (de) |
AT (1) | ATE314159T1 (de) |
AU (1) | AU2002223627A1 (de) |
DE (2) | DE10052438C2 (de) |
ES (1) | ES2255580T3 (de) |
WO (1) | WO2002034418A2 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7273257B2 (en) | 2002-10-14 | 2007-09-25 | Tomoh Gmbh | Recliner chair having a turning up and stretching out footrest mechanism |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10209396A1 (de) * | 2002-03-02 | 2003-09-18 | Basf Coatings Ag | Von unlöslichen Festkörpern freie Elekrotauchlacke (ETL) |
DE10305115B4 (de) | 2003-02-07 | 2007-02-22 | Basf Coatings Ag | Beschichtungsstoffe, Verfahren zu ihrer Herstellung und ihre Verwendung |
US20100116673A1 (en) * | 2006-10-25 | 2010-05-13 | Teruzo Toi | Cationic electrodeposition coating and application thereof |
US8961768B2 (en) | 2008-12-29 | 2015-02-24 | Basf Corporation | Metal containing integrated electrocoat for better corrosion resistance |
US8192603B2 (en) * | 2008-12-29 | 2012-06-05 | Basf Coatings Gmbh | Electrocoat composition and process replacing phosphate pretreatment |
US8815066B2 (en) * | 2008-12-29 | 2014-08-26 | Basf Coatings Gmbh | Coating composition with phosphorous-containing resins and organometallic compounds |
US8702943B2 (en) * | 2008-12-29 | 2014-04-22 | Basf Coatings Gmbh | Electrocoat composition and process replacing phosphate pretreatment |
US8153733B2 (en) * | 2008-12-29 | 2012-04-10 | Basf Coatings Gmbh | Electrocoat compositions with amine ligand |
US9206284B2 (en) * | 2008-12-29 | 2015-12-08 | Basf Coatings Gmbh | Coating compositions with branched phosphorous-containing resin |
US9382638B2 (en) | 2008-12-29 | 2016-07-05 | Basf Corporation | Electrocoat composition and process replacing phosphate pretreatment |
EP2489441A1 (de) * | 2011-02-21 | 2012-08-22 | Cytec Austria GmbH | Mehrlagen-Beschichtungsfilme |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3998716A (en) * | 1974-06-03 | 1976-12-21 | Inmont Corporation | Method of applying coatings |
FR2489350A1 (fr) * | 1980-09-02 | 1982-03-05 | Corona Peintures | Procede et composition pour le revetement multi-couches en mouille/mouille de surfaces electro-conductrices |
JP2989643B2 (ja) * | 1990-08-09 | 1999-12-13 | 関西ペイント株式会社 | 塗膜形成法 |
DE4235778A1 (de) * | 1992-10-23 | 1994-04-28 | Herberts Gmbh | Verfahren zur Herstellung von Mehrschichtlackierungen |
US5376457A (en) * | 1993-08-19 | 1994-12-27 | Volvo Gm Heavy Truck Corporation | Vehicle coating process |
DE4331673A1 (de) * | 1993-09-17 | 1995-05-11 | Herberts Gmbh | Verfahren zur Herstellung von Mehrschichtlackierungen |
DE4409715A1 (de) * | 1994-03-22 | 1995-09-28 | Basf Lacke & Farben | Verfahren zur quantitativen Beschreibung der chemischen Vernetzungsreaktion in Lackfilmen |
DE4438504A1 (de) * | 1994-10-28 | 1996-05-02 | Basf Lacke & Farben | Lackschichtformulierung zur Verwendung in wässrigen Mehrschichtlacksystemen |
DE19512017C1 (de) | 1995-03-31 | 1996-07-18 | Herberts Gmbh | Verfahren zur Mehrschichtlackierung |
US6342144B1 (en) * | 1999-12-15 | 2002-01-29 | Basf Aktiengesellschaft | Cured multilayer coating and processing for its production |
-
2000
- 2000-10-23 DE DE10052438A patent/DE10052438C2/de not_active Expired - Fee Related
-
2001
- 2001-10-19 US US10/381,534 patent/US7087146B2/en not_active Expired - Fee Related
- 2001-10-19 AT AT01988632T patent/ATE314159T1/de not_active IP Right Cessation
- 2001-10-19 AU AU2002223627A patent/AU2002223627A1/en not_active Abandoned
- 2001-10-19 EP EP01988632A patent/EP1333940B1/de not_active Expired - Lifetime
- 2001-10-19 ES ES01988632T patent/ES2255580T3/es not_active Expired - Lifetime
- 2001-10-19 DE DE50108583T patent/DE50108583D1/de not_active Expired - Lifetime
- 2001-10-19 JP JP2002537454A patent/JP4292007B2/ja not_active Expired - Fee Related
- 2001-10-19 WO PCT/EP2001/012102 patent/WO2002034418A2/de active IP Right Grant
Non-Patent Citations (1)
Title |
---|
See references of WO0234418A2 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7273257B2 (en) | 2002-10-14 | 2007-09-25 | Tomoh Gmbh | Recliner chair having a turning up and stretching out footrest mechanism |
Also Published As
Publication number | Publication date |
---|---|
US7087146B2 (en) | 2006-08-08 |
ES2255580T3 (es) | 2006-07-01 |
ATE314159T1 (de) | 2006-01-15 |
EP1333940B1 (de) | 2005-12-28 |
AU2002223627A1 (en) | 2002-05-06 |
DE50108583D1 (de) | 2006-02-02 |
WO2002034418A2 (de) | 2002-05-02 |
DE10052438C2 (de) | 2002-11-28 |
JP2004513224A (ja) | 2004-04-30 |
JP4292007B2 (ja) | 2009-07-08 |
WO2002034418A3 (de) | 2002-11-07 |
US20040094425A1 (en) | 2004-05-20 |
DE10052438A1 (de) | 2002-05-02 |
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