EP1499685A1 - Ressorts peints pour vehicules et leur procede de production - Google Patents

Ressorts peints pour vehicules et leur procede de production

Info

Publication number
EP1499685A1
EP1499685A1 EP03718794A EP03718794A EP1499685A1 EP 1499685 A1 EP1499685 A1 EP 1499685A1 EP 03718794 A EP03718794 A EP 03718794A EP 03718794 A EP03718794 A EP 03718794A EP 1499685 A1 EP1499685 A1 EP 1499685A1
Authority
EP
European Patent Office
Prior art keywords
springs
primer
coating
powder coating
springs according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP03718794A
Other languages
German (de)
English (en)
Inventor
Christopher Hilger
Josef Rademacher
Carsten Vietze
Hans Kularz
Herbert Straub
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BASF Coatings GmbH
Original Assignee
BASF Coatings GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by BASF Coatings GmbH filed Critical BASF Coatings GmbH
Publication of EP1499685A1 publication Critical patent/EP1499685A1/fr
Withdrawn legal-status Critical Current

Links

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
    • 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
    • B05D7/546—No clear coat specified each layer being cured, at least partially, separately
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F1/00—Springs
    • F16F1/02—Springs made of steel or other material having low internal friction; Wound, torsion, leaf, cup, ring or the like springs, the material of the spring not being relevant
    • F16F1/024—Covers or coatings therefor
    • 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
    • B05D2202/00—Metallic substrate
    • 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
    • B05D2451/00—Type of carrier, type of coating (Multilayers)
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F2226/00—Manufacturing; Treatments

Definitions

  • the present invention relates to new coated springs for vehicles.
  • the present invention also relates to a new method for coating springs for vehicles.
  • Springs for vehicles in particular spiral springs
  • modern automotive engineering requires the spring manufacturers to continuously reduce the weight of the springs. This is achieved by spiral springs with fewer turns, which are made from high-quality, mostly cold-rolled special steels.
  • These springs made from cold-rolled, high-strength steels are more sensitive to corrosion than conventional steel springs.
  • the corrosion protection by single-layer painting with powder coatings based on epoxy resin has proven to be inadequate. In particular, spring breakages occur increasingly in modern vehicles in the winter months.
  • springs coated with a two-layer paint have recently been launched on the market. These springs are produced by pretreating them in a customary and known manner, coating them with a metallic zinc-containing powder coating based on epoxy resin and thermally curing the layer. Because of its high zinc content, the primer coating guarantees excellent corrosion protection. However, it is sensitive to stone chipping and must therefore be protected with a top coat to prevent flaking in everyday use.
  • the top coat is usually made from a thermoplastic powder coating.
  • the two-layer paint has an excellent Stone chip resistance and excellent
  • thermoplastic powder coatings are considerable, typically two to four times, higher than the thermally curable powder coatings.
  • thermoplastic powder coatings have to be applied in thicker layers than thermally curable powder coatings with comparable technological properties.
  • thermoplastic powder coatings cannot work with the customary and known ones
  • the object of the present invention is to find new coated springs for vehicles, in particular coated automotive springs, which no longer have the disadvantages of the prior art, but which can be produced from cold-rolled steels and whose coatings can be produced economically and in a simple manner Defects in conventional blasting booths that are common in industry or industry can be stripped easily and efficiently, thus allowing repainting.
  • the coatings are said to be excellent at a considerably smaller layer thickness than that of the known coatings
  • the new coated springs should have a lower weight than the known coated springs and thus contribute to a reduction in the weight and the fuel consumption of the vehicles.
  • thermosetting primer coating containing metallic zinc producible from at least one metallic one
  • thermosetting topcoat producible from at least one thermally curable powder coating (topcoat)
  • the new process for the production of coated springs for vehicles is referred to below as the “process according to the invention”.
  • the springs according to the invention could be produced from cold-rolled steels without the disadvantages described at the outset occurring.
  • the coatings had excellent corrosion protection and stone chip resistance.
  • the interlayer adhesion was excellent.
  • the springs according to the invention had a lower weight than the known coated springs.
  • the springs according to the invention are preferably made from high-strength cold-rolled steel.
  • the primer coating (A) is preferably 50 to 150 and in particular 60 to 120 ⁇ m thick.
  • the primer layers can be produced by applying at least one, in particular a, thermally curable powder coating (primer) containing metallic zinc to the surface of the springs.
  • the amount applied is selected such that the desired layer thicknesses result after the primer layers have been stoved.
  • the primer layers are preferably baked at a temperature of 130 to 220 and in particular 140 to 200 ° C. object temperature.
  • the stoving time is preferably 3 to 45 and in particular 3 to 30 minutes.
  • the baking can also be carried out in several stages, for example by first heating the primer layers to an object temperature of 130 to 150 ° C.
  • the primer layers cannot be cured or only partially cured and then completely baked together with the topcoat layers.
  • the usual and known devices such as convection ovens and / or radiant heaters which emit in IR or NIR (near infrared) can be used for the baking.
  • the primer lacquers used in the process according to the invention have an average particle size and a particle size distribution, as is typical for powder lacquers, with which powder lacquers are used preferred layer thicknesses are produced.
  • the average particle size is preferably 20 to 60 and in particular 25 to 50 ⁇ m.
  • the particle size distribution is preferably narrow, that is to say that the primer lacquers have only very small proportions of very fine particles, preferably less than 5% by weight of particles of a particle size ⁇ 5 ⁇ m, and of coarse particles, preferably less than 1% by weight of particles of a particle size > 100 ⁇ m included.
  • the primer lacquers can be produced using the methods and devices which are customary and known in the powder lacquer field. They are preferably produced by extrusion of the starting products and grinding of the resulting mixtures. If necessary, the primer lacquers are still sifted after grinding.
  • the primer paints can have different compositions. They are preferably produced from starting products, as are usually used in the field of powder coatings.
  • the primer paints contain powdered, metallic zinc.
  • the mean particle size and the particle size distribution of the zinc are matched to those of the primer lacquer.
  • the content of metallic zinc in the primer varnishes can vary widely and depends on the requirements of the individual case.
  • the content is preferably 20 to 60, preferably 25 to 55 and in particular 30 to 50% by weight, in each case based on the primer lacquer.
  • They preferably contain at least one resin containing epoxy groups selected from the group consisting of epoxy resins based on polyphenols, preferably bisphenol A and / or F, in particular bisphenol A, epoxidized novolak resins and epoxidized polyacrylate resins.
  • the epoxy resins preferably have an epoxy equivalent weight of 400 to 3,000, in particular 450 to 2,500 g / equ.
  • Epoxy resins based on bisphenol A are preferably used. Examples of suitable epoxy resins are described in German patent DE 198 50 211 C1, column 3, line 19, to column 4, line 26.
  • the content of the epoxy resins in the primer lacquers can vary widely and depends on the requirements of the individual case. The content is preferably 30 to 80, preferably 30 to 45 and in particular 40 to 70% by weight, in each case based on the primer lacquer.
  • the primer lacquers preferably contain at least one hardener for the epoxy resins.
  • suitable hardeners are polyanhydrides of polycarboxylic acids, in particular polyanhydrides of dicarboxylic acids, phenolic hardeners, in particular based on bisphenol A and / or F, amine hardeners, bicyclic guanidines and dicyandiamide, in particular dicyandiamide, accelerated dicyandiamide and modified dicyandiamide.
  • the hardeners are preferably used in an amount of 1 to 20, preferably 2 to 18, in particular 2 to 15% by weight, in each case based on the primer lacquer.
  • the primer lacquers can furthermore contain at least one suitable catalyst for epoxy resin curing. Examples of suitable catalysts are described in German patent DE 198 50 211 C1, column 5, lines 1 to 26.
  • the primer lacquers can moreover contain at least one additive typical of powder lacquer in customary and known, effective amounts.
  • the additives are preferably selected from the group consisting of waxes, benzoin, leveling agents and flow aids.
  • the springs according to the invention also contain at least one, in particular one, thermoset topcoat (B) which can be produced from at least one, in particular one, thermally curable powder coating.
  • the thermosetting topcoat (B) is preferably free of metallic zinc.
  • the layer thickness of the top coat can vary widely; it is preferably 50 to 150, preferably 70 to 140 and in particular 80 to 130 ⁇ m.
  • the top coat (B) can be produced by applying at least one, in particular one, thermally curable powder coating (top coat) to the surface of the primer coat (A).
  • the amount applied is selected so that the desired layer thicknesses result after the topcoat layers have been stoved.
  • the topcoat layers are preferably also baked at a temperature of 130 to 220 and in particular 140 to 200 ° C. object temperature.
  • the stoving time is preferably 3 to 45 and in particular 3 to 30 minutes.
  • the stoving can also be carried out in several stages, for example by first heating the top coat layers to an object temperature of 130 to 150 ° C.
  • topcoat layers can also be baked together with the uncoated or only partially cured primer layers become.
  • the usual and known devices such as convection ovens and / or radiant heaters which emit in IR or NIR (near infrared) can be used for the baking.
  • the topcoats used in the process according to the invention have an average particle size and a particle size distribution, as is typical for powder coatings, with which powder coatings of the preferred layer thicknesses are produced.
  • the average particle size is preferably 20 to 60 and in particular 25 to 50 ⁇ m.
  • the particle size distribution is preferably narrow, that is to say that the topcoats have only very small proportions of very fine particles, preferably less than 5% by weight of particles with a particle size ⁇ 5 ⁇ m, and of coarse particles, preferably less than 1% by weight of particles with a particle size > 100 ⁇ m included.
  • the topcoats can also be produced using the methods and devices which are customary and known in the powder coating field. They are preferably produced by extrusion of the starting products and grinding of the resulting mixtures. If necessary, the topcoats are still spotted after grinding.
  • the topcoats can be composed differently. They are preferably made from starting materials such as them are usually used in the field of pigmented powder coatings. They preferably contain the epoxy resins, hardeners and additives described above, preferably in the amounts indicated above. In addition, they contain fillers such as are described, for example, in German patent DE 198 50 211 C1, column 6, lines 22 to 49. They are preferably used in the amounts specified there.
  • the total layer thickness of the coating (AB) can vary widely and depends on the requirements of the individual case.
  • the total layer thickness is preferably 100 to 300 nm, preferably 120 to 280 and in particular 140 to 260 ⁇ m.
  • a primer was prepared in a customary and known manner by extrusion, milling and sifting the following mixture:
  • Epikote ® 3002 epoxy resin from Shell
  • Aradur ® 3082 hardener from Vantico
  • zinc dust Z620 from Grillo Zinconi
  • Modaflow ® III leveling agent from Solutia
  • Licowax ® R21 polyethylene-based wax from Clariant
  • Aerosil® R 812 pyrogenic silicon dioxide from Degussa
  • the primer had an average particle size and a particle size distribution, as is typical for powder coatings.
  • top coat a pigmented powder coating
  • a topcoat was produced in a customary and known manner by extrusion, grinding and sifting the following mixture:
  • Ceridust ® 3620 polyethylene wax from the company
  • the topcoat had an average particle size and a particle size distribution, as is typical for powder coatings.
  • example 1
  • the primer of preparation example 1 was applied electrostatically to springs made of cold-rolled steel in a customary and known manner. The amount applied was chosen so that after baking, primer coatings with a layer thickness of 60 to 120 ⁇ m resulted. The primer layers were baked for 5 minutes at 180 ° C object temperature.
  • the topcoat was applied electrostatically to the resulting primer coatings in a customary and known manner. It was applied in an amount that resulted in layer thicknesses of 100 to 120 ⁇ m after baking. The applied topcoat layers were baked for 5 minutes at 180 ° C object temperature.
  • the coating had a total layer thickness of 180 to 250 ⁇ m.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Paints Or Removers (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Laminated Bodies (AREA)

Abstract

L'invention concerne des ressorts pour véhicules, lesdits ressorts étant peints avec un revêtement comprenant (A) au moins un apprêt thermodurcissable, contenant du zinc métallique, pouvant être obtenu à partir d'au moins une peinture en poudre (apprêt) thermodurcissable, contenant du zinc métallique ; et (B) au moins une finition thermoplastique, pouvant être obtenue à partir d'au moins une peinture en poudre (finition) thermodurcissable. L'invention concerne également un procédé pour la production desdits ressorts peints et l'utilisation de ces derniers.
EP03718794A 2002-05-02 2003-04-28 Ressorts peints pour vehicules et leur procede de production Withdrawn EP1499685A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10219591 2002-05-02
DE2002119591 DE10219591A1 (de) 2002-05-02 2002-05-02 Beschichtete Federn für Fahrzeuge und Verfahren zu ihrer Herstellung
PCT/EP2003/004391 WO2003093375A1 (fr) 2002-05-02 2003-04-28 Ressorts peints pour vehicules et leur procede de production

Publications (1)

Publication Number Publication Date
EP1499685A1 true EP1499685A1 (fr) 2005-01-26

Family

ID=29264986

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03718794A Withdrawn EP1499685A1 (fr) 2002-05-02 2003-04-28 Ressorts peints pour vehicules et leur procede de production

Country Status (4)

Country Link
EP (1) EP1499685A1 (fr)
AU (1) AU2003222843A1 (fr)
DE (1) DE10219591A1 (fr)
WO (1) WO2003093375A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4723390B2 (ja) * 2006-01-26 2011-07-13 中央発條株式会社 高耐久性ばねおよびその塗装方法
JP5420212B2 (ja) 2007-10-31 2014-02-19 アクゾ ノーベル コーティングス インターナショナル ビー ヴィ スチール用耐薄チップパウダートップコート
CN102660183B (zh) 2008-01-25 2016-03-30 阿克佐诺贝尔国际涂料股份有限公司 具有基本不含锌底漆的粉末涂料组合物
PT2565240E (pt) 2009-04-03 2014-12-22 Akzo Nobel Coatings Int Bv Revestimento em pó resistente à corrosão e lascagem
CN102471615B (zh) 2009-07-29 2015-08-19 阿克佐诺贝尔国际涂料股份有限公司 能够具有基本不含锌底漆的粉末涂料组合物
JP6408933B2 (ja) 2014-08-28 2018-10-17 日本発條株式会社 車両用サスペンション部材

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3860557A (en) * 1971-01-18 1975-01-14 Beatrice Foods Co Electrostatic method of applying multilayer coating and product produced thereby
EP0525870B1 (fr) * 1991-07-22 1994-09-07 Akzo Nobel N.V. Revêtement en poudre contenant une résine, un agent réticulant et du zinc
US5981086A (en) * 1996-10-08 1999-11-09 Morton International, Inc. Dual-layer coating on high-tensile steel
JPH11188309A (ja) * 1997-12-26 1999-07-13 Chuo Spring Co Ltd ばね板のさび止め方法
DE994141T1 (de) * 1998-10-15 2000-11-09 Morton International, Inc. Gegen Korrosion und Abschiefern geschützte Beschichtungen für hochzugfesten Stahl
DE19850211C1 (de) * 1998-10-31 2000-11-23 Basf Coatings Ag Pulverlacke und ihre Verwendung zur Herstellung geräuscharmer Pulverlackbeschichtungen

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO03093375A1 *

Also Published As

Publication number Publication date
DE10219591A1 (de) 2003-11-20
WO2003093375A1 (fr) 2003-11-13
AU2003222843A1 (en) 2003-11-17

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