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WO1996019298A1 - Procede pour recouvrir d'un revetement protecteur l'aluminium et ses alliages ainsi que des articles composites contenant de l'aluminium et des alliages d'aluminium - Google Patents

Procede pour recouvrir d'un revetement protecteur l'aluminium et ses alliages ainsi que des articles composites contenant de l'aluminium et des alliages d'aluminium Download PDF

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Publication number
WO1996019298A1
WO1996019298A1 PCT/US1995/015606 US9515606W WO9619298A1 WO 1996019298 A1 WO1996019298 A1 WO 1996019298A1 US 9515606 W US9515606 W US 9515606W WO 9619298 A1 WO9619298 A1 WO 9619298A1
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WIPO (PCT)
Prior art keywords
water
resin
coated
process according
aqueous
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Ceased
Application number
PCT/US1995/015606
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English (en)
Inventor
James P. Bershas
Andreas Lindert
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Henkel Corp
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Henkel Corp
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Publication of WO1996019298A1 publication Critical patent/WO1996019298A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F19/00—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers
    • F28F19/02—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers by using coatings, e.g. vitreous or enamel coatings
    • F28F19/04—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers by using coatings, e.g. vitreous or enamel coatings of rubber; of plastics material; of varnish
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G59/00—Polycondensates containing more than one epoxy group per molecule; Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups
    • C08G59/18—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing
    • C08G59/40—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing characterised by the curing agents used
    • C08G59/50—Amines
    • C08G59/52—Amino carboxylic acids
    • 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
    • C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins

Definitions

  • This invention relates to processes for treating surfaces of aluminum and those of its alloys containing at least 45 % by weight of aluminum to form thereon relatively thin coatings that give excellent corrosion protection to the underlying metal.
  • the inven ⁇ tion is especially suited for application to composite metal structures that contain alumin ⁇ um and its alloys along with at least one other metal, such as ordinary steel, galvanized steel, copper, and the like, with significantly different electrochemical characteristics from aluminum.
  • a practically important example of this type of composite structure to which the invention is more particularly suited is a heat exchanger containing aluminum alloy fins and copper tubing on a galvanized steel support.
  • a thick organic coating such as paint can be used to achieve good cor ⁇ osion protectio but such coatings are generally unsuitable for heat exchangers, because (i) such coatin are usually applied as liquids with relatively high viscosity, giving rise to the difficul of penetration into the narrow spaces between heat exchanger fins; (ii) even if such coating can penetrate into narrow spaces, it often bridges them, thereby wasting some the heat exchange surface needed; and (iii) a thick organic coating normally has po heat conductance and therefore would unacceptably diminish the intended functioni of a heat exchanger if it covered the heat exchanger fins, even if the other difficulti could be avoided.
  • a major object of this invention is to provide an organic coating composition a process that achieve at least one, and preferably as many as possible, of the followi characteristics: good corrosion protection against most aqueous liquids, especially s water, when applied in a thin enough coating to be suitable for heat exchanger fins; a lo viscosity for application; minimization of variability of coating thickness when appli by conventional and economical means such as immersion and spraying to objects wi complicated shapes; minimization of the use of volatile organic compounds ("VOC's and/or hexavalent chromium and other materials that have been identified as enviro mentally damaging; durability; and reasonable cost.
  • VOC's and/or hexavalent chromium and other materials minimization of volatile organic compounds
  • Another object is to provide clea ing and other auxiliary compositions and processes that are particularly useful in conne tion with the principal protective coating compositions and processes.
  • Other and/or mo specialized objects will be apparent to those skilled in the art from the description belo General Principles of Description
  • percent, "pa of, and ratio values are by weight;
  • the term “polymer” includes “oligomer”, “copoly er”, “terpolymer”, and the like;
  • the description of a group or class of materials as suita or preferred for a given purpose in connection with the invention implies that mixtures of any two or more of the members of the group or class are equally suitable or preferred;
  • description of constituents in chemical terms refers to the constituents at the time of addi ⁇ tion to any combination specified in the description, and does not necessarily preclude chemical interactions among the constituents of a mixture once mixed;
  • specification of materials in ionic form implies the presence of sufficient counterions to produce electric ⁇ al neutrality for the composition as a whole (any counterions thus implicitly specified should preferably be selected from among other constituents explicitly specified in ionic form, to the extent possible; otherwise such counterions may be freely selected, except for avoiding counterions that act adversely to the objects of the invention); and the term "mole” and its variations may be applied to elemental,
  • a process according to this invention provides a pro- tective coating on a surface of aluminum or one of its alloys containing at least 45 % of aluminum and comprises steps of:
  • an aqueous coating composition comprising, preferably consisting essentially of, or still more preferably consisting of, water and: (Al) a water-soluble resin prepared by (a) reacting approximately chemically equivalent amounts of an epoxy resin having more than one 1,2-epoxy group per molecule and optionally also having one or more hydroxy groups per molecule with an amino-containing aromatic carboxylic aci under conditions which cause the amino group of the aromatic carboxyli acid to react with the epoxy and or hydroxyl groups of the epoxy resin b which leave the carboxyl groups of the aromatic carboxylic acid essent ally unreacted, to produce an intermediate condensate and (b) solubilizin the intermediate condensate by reacting the pendant carboxyl groups wit an amine or ammonia; ( A2) a cross linking resin selected from the group consisting of aminoplast an phenolic resins; and (A3) a component of surfactant; and, optionally, one or more of:
  • step (A5) organic solvent for the epoxy resin before condensation; (B) drying the liquid coating formed in step (A) to form a solid adherent coating the surface to be protected; and, optionally, (C) curing the solid coating formed in step (B) by heating it.
  • the cleaner composition, time of contact the surface with the cleaner, and temperature of cleaner during such contact are chos so that after cleaning and thorough rinsing with water, all the metal surfaces to be pr tected are free from "water-breaks", i.e., visually obvious variations in thickness of t water layer within a few millimeters of each other.
  • Water-breaks are generally undes able, as they give rise to at least the suspicion, and often to the fact, of non-uniform co ing by subsequent treatments with aqueous liquids.
  • Several suitable commercially available cleaners are specified in the working e amples below. In general moderately alkaline cleaners are preferred.
  • the pH value of a working cleaning solution used in connection with this invention pr erably is, with increasing preference in the order given, not less than 7.5, 8.0, 8.5, 9.0, 9.5, or 10.0 and independently preferably is not greater than 13.5, 13.0, 12.5, 12.0, or 11.5.
  • Cleaners with high pH increase the danger of dissolving more of the aluminum sur ⁇ face being cleaned than is desirable, particularly when working with thin walled struc- tures or those in which exacting dimensional tolerances must be maintained.
  • the pH is lower than desirable, the cleaning process will usually require a longer time to achieve a water-break free surface.
  • Cleaners that are capable of achieving a water-break free surface (after subsequent rinsing with water) in, with increasing pref ⁇ erence in the order given, not more than 90, 75, 60, 50, 40, 35, or 31 seconds, are pre- ferred.
  • the concentration of non- volatile solids in a coating composition to be used ac ⁇ cording to this invention preferably is, with increasing preference in the order given, not greater than 19, 17, 15, 13, 11, 10, 9, 8, 7, 6.5, 6.1, 5.8, 5.5, 5.2, or 5.0 % and independ ⁇ ently preferably is, with increasing preference in the order given, not less than 0.1, 0.2, 0.4, 0.8, 1.0, 1.2, 1.4, 1.6, 1.8, 2.0, 2.2, 2.4, 2.6, 2.8, 3.0, 3.2, 3.4, 3.6, 3.8, or 4.0 %.
  • the mass per unit area of the coating produced by the invention preferably is, with increasing preference in the order given, not less than 100, 200, 300, 400, 500, 600,
  • milligrams per square meter (hereinafter often abbreviated as "mg m 2 ”) and independently preferably is, with increasing preference in the order given, not more than 4000, 2000, 1700, 1400, 1200, or 1 100 mg m 2 .
  • the epoxy resin used to prepare the protective coating according to the invention preferably is a polymer of the diglycidyl ether of bis-phenol A, which is more systematic ⁇ ally named "2,2-bis(4-hydroxyphenyl)propane” and may be abbreviated hereinafter as "BPA".
  • BPA 2,2-bis(4-hydroxyphenyl)propane
  • the epoxide equivalent weight of the epoxy resin used preferably is, with increasing preference in the order given, not less than 200, 300, 350, 380, 400,
  • epoxy resin starting materials are normally solids at ambient tem ⁇ perature, and even when liquid at the temperature of condensation with the amino substi- tuted aromatic carboxylic acids used to prepare the modified resin generally have very high viscosity. It is therefore preferred to dissolve the epoxy resin starting material in a suitable solvent before beginning the condensation reaction. Suitable solvents are giv- en in the patents already incorporated by reference herein.
  • the most preferred neutralizing amine for making the resins in a protective coat ⁇ ing according to this invention is dimethylethanolamine, which may be abbreviated here- 0 inafter as "DMEA”.
  • Aminoplast resins are preferred over phenolic resins as cross linking agents for preparing the liquid compositions to be used as coatings for this invention, and among the aminoplast resins melamine-formaldehyde resins are preferred over urea-formalde ⁇ hyde resins.
  • the ratio of non-volatile solids from melamine-formaldehyde resin to solids s derived from epoxy resin in the modified epoxy resin prepared by reaction with amino- substituted aromatic carboxylic acids preferably is, with increasing preference in the ord er given, at least 0.5, 1.0, 1.5, or 2.0 % and independently preferably is, with increasin preference in the order given, not greater than 100, 75, 50, 45, 41, 38, or 36 %.
  • Eithe water dilutable cross linking resins added after dilution of the modified epoxy resin wit o water or less water tolerant cross linking resins added to a more concentrated modifie epoxy resin dispersion can equally well be used.
  • a coating composition to be used according to this invention preferably contain a component of surfactant molecules, preferably in an amount such that the ratio of th amount of total surfactant to the total of epoxy resin and amino-substituted aromatic car
  • 25 boxylic acids reacted to make the coating composition is, with increasing preference i the order given, not less than 0.1, 0.4, 0.7, 0.8, 0.9, 1.0, 1.1, 1.2, or 1.3 % and independ ently preferably is, with increasing preference in the order given, not more than 10, 5, 4 3, 2.5, 2.1, 1.8, 1.6, or 1.5 %.
  • the surfactant component preferably in cludes two chemically distinct types of surfactants: (i) a fluorinated surfactant, preferabl
  • th ratio of the amount of surfactant type (i) as defined immediately above to the amount of surfartant type (ii) that is present in the coating compositions according to the invention preferably is, with increasing preference in the order given, not less than 0.10, 0.20, 0.30, 0.40, 0.50, 0.60, 0.70, 0.73, 0.75, or 0.77 and independently preferably is, with increasing preference in the order given, not more than 10, 9, 8, 7, 6, 5, 4, 3, 2.5, 2.1 , 1.8, 1.5, 1.2,
  • the optional silicone resin component in a coating composition used according to this invention.
  • the amount of silicone resin preferably is such that the ratio of the amount of silicone resin to the total of epoxy resin and amino substituted aromatic carboxylic acid condensed to make the modified resin used in a coating according to this invention is, with increasing preference in the order given, not less than 0.001, 0.002, 0.003, 0.004, 0.0045, 0.0048, 0.0050, or 0.0052 and independently preferably is, with increasing preference in the order given, not greater than 0.05, 0.04, 0.03, 0.02, 0.01, 0.009, 0.008, 0.007, 0.0065, 0.0061, 0.0059, or 0.0057.
  • the coating step is normally performed at ambient temperature (20 - 25 ⁇ C) for convenience, but may be performed at any tem ⁇ perature at which the coating composition is liquid, e.g., from 10 - 90 ° C.
  • the liquid film formed on the surfaces to be protected may be dried simply by exposure to air and preferably is allowed at least to drain in air for a few minutes immediately after removing the coated surface from contact with the bulk of the coating composition, in order to pro ⁇ mote uniformity of thickness of the liquid film on the entire surface to be protected.
  • dry ⁇ ing is hastened by the use of higher temperatures, particularly because it is preferable to cure as well as to dry the coating.
  • the steps of a process according to the in- vention that follow the formation of a liquid film preferably include a time of exposure of the coated surface to a temperature that is, with increasing preference in the order given, at least 100, 110, 120, 130, 140, 145, 150, 155, 158, 161, 163, or 165 ° C and in ⁇ dependently preferably is, with increasing preference in the order given, not greater than 250, 240, 230, 220, 210, 200, 197, 195, 193, or 191 ° C for a time interval that preferably is, with increasing preference in the order given, at least 0.5, 1.0, 2.0, 4, 8, 15, or 25 min ⁇ utes and independently preferably is, with increasing preference in the order given, not greater than 300, 150, 75, 60, 50, 40, 35, or 31 minutes.
  • the practice of this invention may be further appreciated by consideration of the following, non-limiting, examples. Evaluation of Cleaners for Use Prior to Protective Coatine
  • Cleaner Test 1 PARCO® 2960 Cleaner concentrate was diluted with tap water to make a 20 % solution of the concentrate, which was heated to 46 - 49 ⁇ C. A sample of heat exchanger array containing both copper and aluminum was immersed in this solution for 30 sec ⁇ onds, then rinsed for 2 minutes with tap water spray. The aluminum part of the immersed sample was mostly covered with water-breaks. A separate aluminum panel was similarly immersed in the same solution for the same time and also had water breaks after rinsing.
  • the aluminum panel was returned to the cleaner solution for 3 minutes immersion, fol ⁇ lowed by another 2 minute rinse with tap water, but still only 80 - 85 % of the surface was free of water-breaks.
  • the heat exchanger sample was then returned to the hot solu ⁇ tion for an additional 4.5 minutes immersion, followed again by a 2 minute water rinse, This length of cleaning treatment eliminated visible water-breaks, but the surface felt slightly slimy to the touch. Neither the aluminum nor the copper was noticeably dis ⁇ colored.
  • Cleaner Test 2 P3® Hot Stripper 52 was diluted with tap water to a 20 % solution. This solution, at either 64 or 82 ° C, produced water-break free surfaces on either aluminum panels or composite aluminum and copper samples after 30 seconds immersion in the cleaning so ⁇ lution, followed by 2 minutes rinse with tap water.
  • Cleaner Test 3 RIDOLINE® 53 C Cleaner concentrate was diluted with tap water to give a solu- tion containing 15 grams per liter ("g L") of the concentrate.
  • the solution was main ⁇ tained for testing at 62° C. This solution produced water-break free surfaces on alumin ⁇ um panels, composite aluminum and copper samples, and on galvanized steel samples after 30 seconds immersion in the cleaning solution, followed by 2 minutes rinse with tap water. No discoloration of aluminum, copper, or galvanized steel was visually observ- able after as much as 5 minutes of immersion in the hot cleaning solution.
  • Cleaner Test 4 RIDOLINE® 336 Cleaner concentrate was diluted with tap water to give a solu- tion containing 19.9 g L of the concentrate. The solution was maintained for testing at 54 to 57 ° C. This solution produced water-break free surfaces on aluminum panels, composite aluminum and copper samples, and on galvanized steel samples after 30 sec ⁇ onds immersion in the cleaning solution, followed by 2 minutes rinse with tap water. No discoloration of aluminum, copper, or galvanized steel was visually observable after as much as 5 minutes of immersion in the hot cleaning solution.
  • the aluminum part of the immersed sample had a milky-appearing sur ⁇ face upon removal from the cleaner solution but was water-break free after rinsing. Cop- per, aluminum and galvanized steel surfaces all remained free from discoloration by this solution after at least 5 minutes immersion.
  • Cleaner Test 6 P3®-T V 5220-1 Cleaner concentrate was diluted with tap water to a 7 % solu ⁇ tion, which was maintained for testing at 54° C. Immersion of an aluminum panel or of a copper-aluminum composite sample for 30 seconds, followed by 2 minutes rinse with tap water, was not sufficient to produce aluminum surfaces free from water-breaks, but an additional 1.5 minutes of immersion did provide water-break free aluminum surfaces on both types of substrates, and there was no visual evidence of discoloration or other damage any of aluminum, copper, and galvanized steel. PARCO® 2960 Cleaner concentrate, P3® Hot Stripper 52, RIDOLINE® 53 C
  • Resin Example 1 An amount of 413 grams (hereinafter usually abbreviated "g") of EPONTM Resin 1001 F, commercially available from Shell Chemical Co. and described by its supplier as a polymer of the diglycidyl ether of BPA with an epoxide equivalent weight of 450 - 550, was charged to a two liter capacity resin kettle equipped with a stainless steel bladed mechanical stirrer, reflux condenser, inlet port, heating mantle, temperature monitor and controller, and means for maintaining a nitrogen atmosphere over the liquid part of the contents of the kettle. Then 160 g of PROPASOLTM P solvent (hereinafter denoted briefly as "P Solvent”), commercially available from Union Carbide Corp.
  • P Solvent PROPASOLTM P solvent
  • FC-430 FLUORADTM FC-430 (briefly denoted hereinafter as "FC-430”), a surfactant commercially available from Minnesot Mining and Manufacturing Co.
  • the mixture as thus prepared and conditioned was reheated to 90 - 95 ⁇ C and stirring was resumed.
  • 500 milliliters ("mL") of deionized water (hereinafter briefly de ⁇ noted as "DIW”) was then added dropwise, sufficiently slowly that the stirring motor did not slip.
  • DIW deionized water
  • the entire mixture was then transferred to a vessel with 4 liters capacity and a high-shear agitator, which was kept in operation, with the temperature of the agitated mixture being maintained at about 75° C, during continued dropwise addition of deion ⁇ ized water until a total of 1726 mL had been added.
  • Resin Example 2 An amount of 243 g of EPONTM Resin 1001 F was charged to a one liter capacity resin kettle equipped with a stainless steel bladed mechanical stirrer, reflux condenser, inlet port, heating mantle, temperature monitor and controller, and means for maintaining a nitrogen atmosphere over the liquid part of the contents of the kettle. Then 114 g of P Solvent was added to dissolve the resin and produce a mixture with practically workable viscosity. This mixture was heated with stirring to 82° C, and then 34 g of solid pow- dered PABA was added with continued stirring. An additional 20 g of P Solvent was fin ⁇ ally used to wash all the solid PABA into the kettle.
  • Resin Example 4 An amount of 826 g of EPONTM Resin 1001 F was charged to a two liter capacity resin kettle equipped with a stainless steel biaded mechanical stirrer, reflux condenser, inlet port, heating mantle, temperature monitor and controller, and means for maintaining a nitrogen atmosphere over the liquid part of the contents of the kettle. Then 360 g of P Solvent was added to dissolve the resin and produce a mixture with practically workable viscosity. The condenser water was then turned on, the liquid and gas spaces purged with nitrogen, and stirring begun. This mixture was heated with stirring to 84° C, at which point dissolution of the EPONTM Resin appeared to be complete. Then 1 14 g of solid powdered PABA was added over a 10 minute period with continued stirring.
  • Test Panel 1.1.1 was prepared by immersing a cleaned and rinsed panel as described above for 30 seconds in Coating Composition 1.1 at a temperature of 20 - 25 ° C, remov ⁇ ing the panel from contact with Coating Composition 1.1 and allowing the panel to drip in open air for 5 - 10 minutes, then drying and curing the panel in an oven at 177° C for 30 minutes.
  • Test Panel 1.1.2 was prepared in the same manner, except that the time of immersion in Coating Composition 1.1 was 60 seconds.
  • Coating Composition 1.2 was prepared by adding 1.2 g of BYKTM 301 silicone resin to the remaining quantity of Coating Composition 1.1.
  • Test Panels 1.2.1 and 1.2.2 were then prepared in the same manner as Test Panels 1.1.1 and 1.1.2 respectively, ex ⁇ cept for substituting Coating Composition 1.2 for Coating Composition 1.1.
  • Coating Composition 1.3 was prepared by mixing 9.5 g of 30 % H 2 O 2 in water solution with 568 g of Coating Composition 1.2.
  • Test Panels 1.3.1 and 1.3.2 were then prepared in the same manner as Test Panels 1.1.1 and 1.1.2 respectively, except for substituting Coating Composition 1.3 for Coating Composition 1.1.
  • Comparison Test Panel 1.1 was prepared in the same manner as Test Panel 1.1.1, except for omitting the contact with Coating Composition 1.1.
  • Group 2
  • Coating Composition 2.1 was the same composition as Coating
  • Test Panel 2.1.1 was prepared by immersing a cleaned and rinsed panel as described above for 30 seconds in Coating Composition 2.1 at a tempera ⁇ ture of 20 - 25 ° C, removing the panel from contact with Coating Composition 2.1 and allowing the panel to drip in open air for 5 - 10 minutes, then drying the panel in an oven at 177° C.
  • Test Panel 2.1.2 was prepared in the same manner, except that the time of im ⁇ mersion in Coating Composition 2.1 was 60 seconds.
  • Comparison Test Panel 2.1 was prepared in the same manner as Test Panel 2.1.1, except for omitting the contact with Coating Composition 2.1.
  • Coating Composition 2.2 was made by mixing 2479 g of DIW with 396 g of the product of Resin Example 1 above, resulting in a product with a pH of 8.99.
  • Test Panels 2.2.1 and 2.2.2 were prepared in the same manner as Test Panels 2.1.1 and 2.1.2 respectively, except for substituting Coating Composition 2.2 for Coating Com- s position 2.1.
  • Comparison Group 3 For this group, the same type of test panels as for Group 1 were cleaned by im ⁇ mersion in a cleaner solution as used for Group 1 and subsequent rinsing, and then were immersed in an aqueous solution containing 0.10 % of a polymer made substantially as o described in column 11 lines 47 - 59 of U. S. Patent 5,068,299 of Nov. 26, 1991 to Lin- dert et al. and 0.022 % of fluozirconic acid, a solution hereinafter denoted as "T-13", in ⁇ stead of in Coating Solution 1. Except for this change in coating solution, Comparison Test Panels 3.1.1 and 3.1.2 were prepared in the same manner as Test Panels 1.1.1 and 1.1.2 respectively. s Group 4
  • Coating Composition 4.1 was prepared by mixing 2479 g of Coating Composition 2.2 0 with 4.9 g of BYKTM 301 silicone resin. Except for the substitution of Coating Composi ⁇ tion 4.1 for another coating composition and for substituting vigorous shaking by hand for allowing the coated substrate to drip, Test Parts 4.1.1 and 4.1.2 were prepared in the same manner as Test Panels 1.1.1 and 1.1.2 respectively. There was no evidence of bridging on the Test Parts. s Group 5
  • Group 6 Coating Composition 6.1 was prepared by adding sufficient dimethylethanolam- ine to Coating Composition 1.1 to raise the pH value to 9.71.
  • Test Panels 6.1.1, 6.1.2, 6.1.3, and 6.1.4 were prepared by substituting this coating composition, but otherwise in the same manner, as for Test Panels 1.1.1, 1.1.2, 2.1.1, and 2.1.2 respectively.
  • Group 7 Coating Composition 7.1 was made by mixing 22 g of DIW with 68 g of the prod ⁇ uct from Resin Example 2.
  • Test Panel 7.1.1 of Type 3003 Aluminum Alloy was made in the same manner, except for substituting Coating Composition 7.1, as Test Panel 1.1.2.
  • Coating Composition 7.2 was made by adding to Coating Composition 7.1 a sufficient amount of CYMELTM 385 Resin (hereinafter briefly denoted as “385 Resin "), a product commercially available from American Cyanamid Co., Wayne, New Jersey and de ⁇ scribed by its supplier as a "partially methylated, melamine-formaldehyde cross-linking agent that has a low degree of alkylation and is infinitely dilutable with water” and con ⁇ tains 80 + 2 % solids, to supply an amount of active melamine-formaldehyde resin in ⁇ gredient equal to that already present in Coating Composition 7.1 from the CYMELTM 303 Resin used in preparing the product of Resin Example 2.
  • 385 Resin a product commercially available from American Cyanamid Co., Wayne, New Jersey and de ⁇ scribed by its supplier as a "partially methylated, melamine-formaldehyde cross-linking agent that has a
  • Test Panel 7.2.1 was then made in the same manner as Test Panel 7.1.1, except that Coating Composition 7.2 was substituted for Coating Composition 7.1.
  • Coating Compositions 7.3, 7.4, 7.5, and 7.6 containing respectively 3, 4, 5, and 6 times the amount of active melamine-formaldehyde resin in Coating Composition 7.1 were pre- pared in the same manner, and, except for substituting the corresponding Coating Com ⁇ positions, Test Panels 7.3.1, 7.4.1, 7.5.1, and 7.6.1 were prepared in the same manner as Test Panel 7.1.1.
  • Coating Composition 8.1 was prepared by mixing 243 g of DIW with 57 g of the product from Resin Example 3.
  • Coating Compositions 8.2, 8.3, 8.4, and 8.5 were the made by adding 385 Resin in the same manner as described in Group 7 so as to produc respectively 1.5, 2.0, 2.5, and 3.0 times the total concentration of active melamine-form aldehyde resin that is present in Coating Composition 8.1.
  • Test Panels 8.1.1, 8.2.1, 8.3.1 8.4.1, and 8.5.1 were then made with these Coating Compositions in the same manne as otherwise specified in Group 7. Tests and Results

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Abstract

Des solutions diluées (i) de résine soluble dans l'eau, obtenue en faisant réagir des résines époxy successivement avec des acides aromatiques carboxyliques amino-substitués et avec des amines ou de l'ammoniac, (ii) une résine de réticulation et (iii) des tensio-actifs, produisent un revêtement protecteur contre la corrosion, sur l'aluminium et ses alliages, qui peut s'utiliser sur des structures telles que des échangeurs de chaleur qui ont une multiplicité d'ailettes faiblement écartées les unes des autres, sans risque de ponter les espaces entre les ailettes.
PCT/US1995/015606 1994-12-22 1995-12-08 Procede pour recouvrir d'un revetement protecteur l'aluminium et ses alliages ainsi que des articles composites contenant de l'aluminium et des alliages d'aluminium Ceased WO1996019298A1 (fr)

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US36268694A 1994-12-22 1994-12-22
US08/362,686 1994-12-22

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WO1996019298A1 true WO1996019298A1 (fr) 1996-06-27

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1089369A2 (fr) * 1999-09-28 2001-04-04 Calsonic Kansei Corporation Echangeur de chaleur pour l'eau de refroidissement en circulation de piles à combustible et méthode de fabrication
EP1233245A3 (fr) * 2001-02-15 2003-07-02 Sanden Corporation Echangeurs de chaleur et méthodes de production de ces échangeurs

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3693711A (en) * 1971-03-08 1972-09-26 Alfred E Zygiel Monolithic cast body heat exchanger
US4098744A (en) * 1977-03-28 1978-07-04 Shell Oil Company Curable water-borne epoxy resin coating compositions
US4116853A (en) * 1974-02-14 1978-09-26 Amchem Products, Inc. Composition for cleaning aluminum at low temperatures
US4427034A (en) * 1980-05-23 1984-01-24 Sumitomo Light Metal Industries, Ltd. Coating composition for protecting inner surface of tubes in heat exchangers
US5218031A (en) * 1991-06-10 1993-06-08 Man-Gill Chemical Company Aqueous coating compositions, process and coated substrates

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3693711A (en) * 1971-03-08 1972-09-26 Alfred E Zygiel Monolithic cast body heat exchanger
US4116853A (en) * 1974-02-14 1978-09-26 Amchem Products, Inc. Composition for cleaning aluminum at low temperatures
US4098744A (en) * 1977-03-28 1978-07-04 Shell Oil Company Curable water-borne epoxy resin coating compositions
US4427034A (en) * 1980-05-23 1984-01-24 Sumitomo Light Metal Industries, Ltd. Coating composition for protecting inner surface of tubes in heat exchangers
US5218031A (en) * 1991-06-10 1993-06-08 Man-Gill Chemical Company Aqueous coating compositions, process and coated substrates

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1089369A2 (fr) * 1999-09-28 2001-04-04 Calsonic Kansei Corporation Echangeur de chaleur pour l'eau de refroidissement en circulation de piles à combustible et méthode de fabrication
EP1233245A3 (fr) * 2001-02-15 2003-07-02 Sanden Corporation Echangeurs de chaleur et méthodes de production de ces échangeurs
US6945321B2 (en) 2001-02-15 2005-09-20 Sanden Corporation Heat exchangers

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