WO2016092899A1 - Élément ressort - Google Patents

Élément ressort Download PDF

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Publication number
WO2016092899A1
WO2016092899A1 PCT/JP2015/071892 JP2015071892W WO2016092899A1 WO 2016092899 A1 WO2016092899 A1 WO 2016092899A1 JP 2015071892 W JP2015071892 W JP 2015071892W WO 2016092899 A1 WO2016092899 A1 WO 2016092899A1
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WO
WIPO (PCT)
Prior art keywords
zinc
powder
spring body
spring
resin
Prior art date
Application number
PCT/JP2015/071892
Other languages
English (en)
Japanese (ja)
Inventor
岡本　貴幸
靖彦 國田
翔太 大塚
昌泰 開作
Original Assignee
中央発條株式会社
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.)
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Application filed by 中央発條株式会社 filed Critical 中央発條株式会社
Priority to CN201580067514.1A priority Critical patent/CN107002793B/zh
Publication of WO2016092899A1 publication Critical patent/WO2016092899A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/38—Layered products comprising a layer of synthetic resin comprising epoxy resins
    • 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
    • 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
    • C09D167/00—Coating compositions based on polyesters obtained by reactions forming a carboxylic ester link in the main chain; Coating compositions based on derivatives of such polymers
    • 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
    • C09D5/03—Powdery paints
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C26/00—Coating not provided for in groups C23C2/00 - C23C24/00
    • 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
    • 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
    • F16F1/04—Wound springs
    • F16F1/12—Attachments or mountings
    • 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
    • F16F1/18—Leaf springs
    • 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
    • F16F1/18—Leaf springs
    • F16F1/20—Leaf springs with layers, e.g. anti-friction layers, or with rollers between the leaves

Definitions

  • the present invention relates to a spring member having a corrosion-resistant coating film formed on the surface.
  • ⁇ ⁇ Spring members made of metallic materials are subject to corrosion depending on the usage environment, resulting in characteristic changes and strength deterioration.
  • a protective film such as a coating film by plating or a coating film by paint is provided on the surface of the metal member.
  • Corrosion occurs when metal atoms on the metal member surface are ionized and desorbed from the member surface. If there is a metal (base metal) that has a higher ionization tendency than the metal constituting the member on the surface of the metal member, the base ion has a higher ionization tendency than the metal (precious metal) that constitutes the metal part in a corrosive environment.
  • the metal of this can be ionized to prevent corrosion of the metal member.
  • Such anticorrosion is called sacrificial anticorrosion.
  • zinc is mainly used as a sacrificial material.
  • a protective film using sacrificial corrosion protection by zinc there is a coating film obtained by applying a powder coating containing zinc powder at a relatively high concentration and curing it by baking.
  • a coating film made of a paint containing such zinc powder at a high concentration may cause cracks due to pores generated during coating, and corrosive substances may enter the cracks, resulting in a decrease in the protective function of the coating film.
  • the spring member is repeatedly elastically deformed, the cracks generated in the coating film with the passage of time of use tend to extend.
  • pebbles and gravel jumped up by a wheel collide with the surface of the suspension spring, and a crack generated in the coating film easily extends.
  • Patent Document 1 a high-concentration zinc powder coating material using an epoxy-based synthetic resin as a binder is applied to the surface of the spring plate on the tensile force acting side to form a first coating film, and the same series of epoxy is coated on the first coating film.
  • a rust prevention method is described in which a synthetic resin coating is applied to form a second coating film.
  • Patent Document 2 describes a powder coating containing an epoxy resin, a curing agent, two types of zinc powders having different particle sizes, and a rust preventive pigment.
  • Patent Document 1 forms a second coating film on a first coating film coated with a high-concentration zinc powder paint, thereby preventing the invasion of corrosive substances and providing a protective function by the coating film. Trying to improve. However, there is a problem caused by providing the second coating film.
  • the spring member is often used by being fixed to a frame or the like with a fastening member such as a bolt.
  • the resin coating film such as an epoxy-based synthetic resin paint used as the second coating film described in Patent Document 1 has a variation in thickness over time at the part where the fastening member is in contact, and the phenomenon that the thickness is often reduced over time. Arise. This is a phenomenon called so-called sag of the coating film.
  • Patent Document 1 describes that the second coating film is not formed on the portion of the fastening tool in order to prevent the fastening tool from becoming loose easily due to the sag of the second coating film (Patent Document 1). (See paragraph [0006]).
  • the coating film by the powder coating described in Patent Document 2 is a single-layer coating film containing zinc powder, there is almost no sag of the coating film, but the protective function by corrosive substances entering the cracks Can not be sufficiently prevented, and the corrosion resistance is poor.
  • An object of the present invention is to provide a spring member that maintains high anticorrosion properties and has improved sag resistance.
  • the present invention includes a spring body, A coating film formed by applying a powder coating composition containing an epoxy resin, an acid-terminated polyester resin and zinc powder on the surface of the spring body, the epoxy resin on the surface side of the spring body and the A coating layer having a zinc-containing layer containing more zinc powder than acid-terminated polyester resin, and a resin-containing layer on the zinc-containing layer containing more epoxy resin and acid-terminated polyester resin than the zinc powder; It is a spring member characterized by including.
  • the powder coating composition is When the sum of the content of the epoxy resin and the content of the acid-terminated polyester resin is 100 parts by mass, the content of the epoxy resin is 10 to 80 parts by mass, and the content of the acid-terminated polyester resin is 20 to 90 parts by mass, The content of the zinc powder is 30 to 80% by mass with respect to the whole powder coating composition.
  • the present invention is characterized in that the content of the zinc powder is 55 to 80% by mass with respect to the whole powder coating composition.
  • the coating film is formed so as to have the zinc-containing layer and the resin-containing layer on the surface of the spring body by coating one kind of powder coating composition once.
  • the coating film is formed so as to have the zinc-containing layer and the resin-containing layer by preheating to attach the powder coating composition to the preheated spring body, Or after making the said powder coating composition adhere to the said spring main body, it forms so that it may have the said zinc containing layer and the said resin containing layer by post-heating which heats this spring main body.
  • the spring member includes a spring body and a coating film formed on the surface of the spring body.
  • the coating film is formed by coating a powder coating composition containing an epoxy resin, an acid-terminated polyester resin and zinc powder, and has a two-layer structure of a zinc-containing layer containing a large amount of zinc powder and a resin-containing layer containing a large amount of resin. .
  • the zinc-containing layer is on the surface side of the spring body, and the resin-containing layer is on it
  • the spring body and zinc are sufficiently in contact with each other, and higher corrosion resistance is exhibited. Since the resin component is unevenly distributed on the surface side of the coating film in the coating film, the impact from the outside is alleviated and cracks occurring in the coating film are prevented. Since the resin-containing layer is formed with a relatively thin layer thickness, the variation in the layer thickness is small and the sag resistance is improved without causing sag. And even if the layer thickness is thin, it is formed integrally with the zinc-containing layer, so there is no clear interface between layers, and no delamination occurs.
  • the coating film of the present invention can realize a spring member that maintains high anticorrosion properties and has improved sag resistance due to the zinc-containing layer and the resin-containing layer.
  • the powder coating composition has a content of the epoxy resin of 10 to 80 when the sum of the content of the epoxy resin and the content of the acid-terminated polyester resin is 100 parts by mass. 1 part by adjusting the content of the acid-terminated polyester resin to 20 to 90 parts by mass and the content of the zinc powder to 30 to 80% by mass with respect to the entire powder coating composition.
  • a coating film including a zinc-containing layer and a resin-containing layer can be formed.
  • the corrosion resistance can be further improved by setting the content of the zinc powder to 55 to 80% by mass with respect to the whole powder coating composition.
  • the two layers, the zinc-containing layer and the resin-containing layer can be formed on the surface of the spring main body by simply applying one kind of powder coating composition once. There is no need for painting, and the number of steps can be reduced while the coating film is highly functional, and the spring member can be easily manufactured.
  • either the pre-heating in which the spring body is heated in advance before the powder coating composition is attached, or the post-heating in which the spring body is heated after the powder coating composition is attached is contained in zinc.
  • a highly functional coating film having a layer and a resin-containing layer can be formed.
  • the type of the spring member of the present invention is not particularly limited.
  • a coil spring, a leaf spring, a torsion bar, a stabilizer and the like can be mentioned.
  • the spring member of this invention has a spring main body and the coating film formed on the surface of a spring main body using the powder coating composition containing an epoxy resin, an acid terminal polyester resin, and zinc powder.
  • the material of the spring body is not particularly limited as long as it is a metal that exhibits an anticorrosive effect by zinc.
  • the anticorrosive effect by the coating film of the present invention is due to so-called sacrificial anticorrosion, and the base metal is prevented from being corroded using a base metal having a higher ionization tendency than the base metal.
  • the coating film of the present invention contains zinc powder, the spring body may be made of a noble metal having a smaller ionization tendency than zinc, and for example, iron, nickel, copper and the like can be used.
  • JIS-regulated spring steel that is generally used as a material for the spring body is suitable.
  • the spring main body for example, after hot or cold forming of spring steel or the like, surface hardening treatment may be performed by shot peening or the like, or the surface roughness may be adjusted.
  • a coating of a phosphate salt such as zinc phosphate or iron phosphate is formed on the surface of the spring body.
  • the corrosion resistance of the spring member and the adhesion of the coating film are improved.
  • the phosphate coating covers 80% or more of the area of the painted surface of the spring body.
  • the corrosion resistance is further improved.
  • a known forming method can be used. For example, a dipping method in which the spring body is immersed in a phosphate solution tank, or a spray method in which a phosphate solution is sprayed onto the spring body with a spray gun or the like is used.
  • the coating film is obtained by applying a powder coating composition containing an epoxy resin, an acid-terminated polyester resin and zinc powder on the surface of the spring body and curing it by baking.
  • This coating film has a zinc-containing layer containing more zinc powder than the epoxy resin and acid-terminated polyester resin, and a resin-containing layer containing more epoxy resin and acid-terminated polyester resin than the zinc powder.
  • the zinc-containing layer is formed on the surface side of the spring body, and the resin-containing layer is formed on the zinc-containing layer.
  • the coating film may be formed on the entire surface of the spring body, or may be formed only on a part thereof.
  • the powder coating composition for forming the coating film of this invention contains an epoxy resin, an acid terminal polyester resin, and zinc powder as mentioned above.
  • the content of the epoxy resin when the sum of the content of the epoxy resin and the content of the acid-terminated polyester resin is 100 parts by mass, the content of the epoxy resin is 10 to 80 parts by mass.
  • the content of the acid-terminated polyester resin is preferably 20 to 90 parts by mass, and the content of the zinc powder is preferably 30 to 80% by mass with respect to the entire powder coating composition.
  • the powder coating composition In the state of the coating composition before being applied to the surface of the spring body, the powder coating composition is uniformly distributed without any bias between the resin component and the zinc powder. It can be handled in the same manner as the body coating composition. Moreover, the electrostatic coating method can be used similarly to the conventional coating method, and the same handling as the conventional method is possible. That is, the powder coating composition can be handled in the same manner as before without any change from the conventional one.
  • the zinc-containing layer containing a relatively large amount of zinc powder covers the surface of the spring body with zinc powder, and exhibits the sacrificial anticorrosive effect of zinc on the iron material. Since the zinc powder is concentrated in the zinc-containing layer, even if the content of the zinc powder with respect to the whole powder coating composition is relatively small, the anticorrosion property is sufficiently exhibited. Since the content of zinc powder can be reduced, handling is easier and coating workability is better than conventional powder coating compositions containing an excessive amount of zinc. Since the resin component is unevenly distributed on the surface side of the coating film and no zinc powder is present, surface smoothness can be easily obtained.
  • the powder coating composition contains a colorant such as a pigment
  • a large amount of pigment is also contained on the resin-containing layer side, and since there is almost no zinc powder in the resin-containing layer, Color development is improved.
  • the zinc-containing layer and the resin-containing layer are integrally formed with one coat, and a clear interface is not formed between the zinc-containing layer and the resin-containing layer, so that there is no separation between these layers.
  • epoxy resin examples of the epoxy resin contained in the coating composition include bisphenol A type epoxy resin, bisphenol F type epoxy resin, novolac type epoxy resin, biphenyl type epoxy resin, polymer type epoxy resin (phenoxy resin), which are solid at room temperature, and these A hydrogenated epoxy resin obtained by hydrogenating a resin can be exemplified.
  • the softening point is preferably 60 to 120 ° C, more preferably 60 to 100 ° C. When the softening point is less than 60 ° C., blocking of the powder coating composition occurs, which is not preferable. When the softening point exceeds 120 ° C., when the melt kneading is performed, the viscosity is too high and the dispersion is not sufficiently performed. Film performance is not demonstrated.
  • the equivalent of the epoxy resin is 400 to 3000 g / equivalent, preferably 600 to 2500 g / equivalent.
  • Specific examples of bisphenol A type epoxy resin and bisphenol F type epoxy resin include jER-1001, 1002, 1003, 1004, 1055, 1007, 1003F, 1004F, 1005F, 1009F, 1004FS, 1006FS, 1007FS, manufactured by Mitsubishi Chemical Corporation. 4005P, 4007P, Nippon Steel Chemical Co., Ltd. Epototo YD-011, 012, 013, 014, 017, 902, 903N, 904, 907, 2004, 2005RL, Dow Chemical Co., Ltd. DER-662E, 663U, 664U, 666E, 667E etc. are mentioned.
  • novolak type epoxy resins include EPICLON N-660, N-665, N-670, N-673, N-680, N-695, N-770, N-775, manufactured by DIC Corporation.
  • biphenyl type epoxy resin and polymer type epoxy resin (phenoxy resin) include JER-YX4000, YX4000H, YL612H, YX7399, 1256, 4250, and 4275 manufactured by Mitsubishi Chemical Corporation.
  • the content of the epoxy resin in the powder coating composition is preferably 10 to 80 parts by mass when the sum of the content of the epoxy resin and the content of the acid-terminated polyester resin is 100 parts by mass.
  • the acid-terminated polyester resin contained in the coating composition is not particularly limited as long as it is used in an ordinary epoxy resin-containing powder coating composition.
  • the acid-terminated polyester resin include those having a functional group such as a carboxyl group at the end of the polyester resin, and those having a phosphate compound ester-bonded to the end of the polyester resin.
  • Specific examples of the carboxyl group-terminated polyester resin include CRYLCOAT (CC) 1683-0, 2621-1 and 2670 manufactured by Daicel Ornex Co., Ltd.
  • the content of the acid-terminated polyester resin in the powder coating composition is preferably 20 to 90 parts by mass when the sum of the content of the epoxy resin and the content of the acid-terminated polyester resin is 100 parts by mass. .
  • the zinc powder contained in the coating composition is not particularly limited as long as it is used in an ordinary powder coating composition.
  • a zinc powder having a medium particle size of 1 to 30 ⁇ m, preferably 4 to 15 ⁇ m can be used.
  • zinc powder F-500 (medium particle size 7.5 ⁇ m), F-1000 (medium particle size 4.9 ⁇ m), F-3000 (medium particle size 3.7 ⁇ m) manufactured by Honjo Chemical Co., Ltd.
  • the medium particle size of the zinc powder means a particle size at an integrated value of 50% in a particle size distribution measured using a laser particle size distribution measuring instrument such as Microtrack manufactured by Nikkiso Co., Ltd.
  • the content of zinc powder in the powder coating composition is 30 to 80% by mass, preferably 55 to 80% by mass, and most preferably 60 to 70% by mass with respect to the entire powder coating composition. .
  • the total amount may be within the above range.
  • the coating When the content of zinc powder in the powder coating composition is 30 to 80% by mass with respect to the whole powder coating composition, the coating is separated so that the coating film has a zinc-containing layer and a resin-containing layer. Furthermore, when the content is 55 to 80% by mass, the powder coating composition exhibits sufficient anticorrosion properties even if it contains no rust preventive pigment.
  • Anti-rust pigment The powder coating composition can obtain a desired coating film as long as it contains the above-described components as essential components, but may further contain a rust preventive pigment.
  • Antirust pigments include phosphate derivatives such as aluminum phosphate, molybdate derivatives such as zinc molybdate and aluminum phosphomolybdate, borate derivatives such as cyanamide calcium zinc and barium borate, and vanadates such as strontium vanadate. Derivatives, bismuth hydroxide and the like can be mentioned, and preferably aluminum phosphate, zinc phosphate, zinc molybdate, aluminum phosphomolybdate, zinc cyanamide calcium, barium borate, strontium vanadate.
  • anti-corrosive pigments examples include PM-300 (aluminum phosphomolybdate, manufactured by Kikuchi Color Co., Ltd.), LF Bowsei CP-Z (zinc phosphate, manufactured by Kikuchi Color Co., Ltd.), K-WHITE (aluminum tripolyphosphate, And TAISUN 11M-1 (barium borate, Sakai Chemical Industry Co., Ltd.).
  • the content of the rust preventive pigment in the powder coating composition is 0 to 70% by mass, preferably 10 to 50% by mass, based on the entire powder coating composition.
  • the powder coating composition further includes a coloring pigment, an extender pigment, a fluidity adjusting agent, an antiblocking agent, a surface adjusting agent, an anti-waxing agent, and a charge control agent that are used in ordinary powder coating compositions.
  • a coloring pigment an extender pigment
  • a fluidity adjusting agent an antiblocking agent
  • a surface adjusting agent an anti-waxing agent
  • a charge control agent that are used in ordinary powder coating compositions.
  • other additives such as a curing accelerator may be contained.
  • Method for producing powder coating composition for example, a known production method such as a pulverization method can be used.
  • a mixture of an epoxy resin, an acid-terminated polyester resin, zinc powder and, if necessary, a rust preventive pigment and other additives is dry-mixed with a mixer such as a tumbler mixer or a Henschel mixer, and melt-kneaded with a kneader.
  • a kneading machine for example, a general kneading machine such as a monoaxial or biaxial extruder, a triple roll, a lab blast mill can be used.
  • the kneaded product is cooled and solidified, and the solidified product is coarsely and finely pulverized to obtain a pulverized product.
  • a pulverizer for example, a jet type pulverizer that pulverizes using a supersonic jet stream, and a solidified material in a space formed between a rotor (rotor) and a stator (liner) that rotate at high speed.
  • An impact pulverizer that introduces and pulverizes can be used.
  • a post additive may be added to the pulverized product.
  • the pulverized product is classified to adjust the powder to a desired particle size and a desired particle size distribution to obtain a powder coating composition.
  • a known classifier capable of removing excessively pulverized toner base particles by classification with centrifugal force and wind force can be used.
  • a swirl type wind classifier rotary wind classifier
  • the manufacturing method of a powder coating composition is not restricted to said grinding
  • a coating film is formed on the surface of the spring body using the powder coating composition obtained as described above.
  • the coating method for applying the powder coating composition includes at least a coating process for applying the powder coating composition to the coating film forming surface of the spring body surface, and a baking process for baking and curing the applied powder coating composition. Including.
  • the first coating method includes a heating step of heating the spring body, and the surface temperature T (° C.) of the spring body is Tf ⁇ 20 ⁇ T ⁇ Tf + 20 (Tf: curing point temperature of the powder coating composition (° C.)) ), A coating process for attaching the powder coating composition to the surface of the spring body, and a curing process for curing the attached powder coating composition.
  • the method for heating the spring body is not particularly limited.
  • the spring body may be housed in a hot air furnace, a far infrared furnace, or the like and heated. Further, the spring body may be energized or induction heated. Among these, current heating is preferable because it has high thermal efficiency and can be heated regardless of the shape of the spring body.
  • non-contact-type thermometers such as a thermograph, in a heating process, a painting process, and a hardening process.
  • the heating process when the surface temperature T (° C.) of the spring body reaches Tf ⁇ 20 ⁇ T ⁇ Tf + 20, the heating is stopped. In the subsequent coating process, the powder coating composition is adhered to the surface of the spring body. Note that the curing start point temperature (Ts) and the curing completion point temperature (Tf) of the powder coating composition are determined in advance from the start point and end point of the exothermic peak of the powder coating composition.
  • the powder coating composition is applied to the surface of the spring body that has been heated in advance in the heating process.
  • a known electrostatic powder coating method can be used.
  • a corona charging method, a friction charging method, or the like can be used.
  • ⁇ Coating is done with a gun unit with a cylindrical tip at both the corona charging method and the friction charging method.
  • a high voltage is applied to the corona electrode arranged at the tip of the gun unit to cause corona discharge, and the generated powder charges the paint powder near the corona electrode.
  • An electric field is formed between the corona electrode and the spring body with the spring body as a ground potential, and the charged paint powder is adhered to the spring body by the electric field.
  • the paint powder moving inside the gun unit is rubbed and charged on the inner surface of the gun unit.
  • the spring body By setting the spring body to the ground potential, the charged paint powder is injected from the gun unit and attached to the spring body.
  • the charge amount by discharge in the corona charging method and the injection amount in the friction charging method may be appropriately set according to the spring body to which the powder coating composition is to be applied.
  • the powder coating composition is cured in a state of being allowed to cool, that is, by the residual heat of the spring body.
  • T the surface temperature of the spring body at the completion of curing
  • Ts the temperature at which the powder coating composition is cured (° C.)
  • the spring body is heated and the powder coating composition is adhered while the surface temperature T (° C.) of the spring body is in the range of Tf ⁇ 20 ⁇ T ⁇ Tf + 20. . Thereafter, the surface temperature of the spring body decreases with time due to cooling. Curing is desirably completed while the surface temperature of the spring body is Ts + 30 ° C. or higher. Although it depends on the surface temperature of the spring body at the start of the coating process, the thickness of the coating film, etc., for example, if the surface temperature of the spring body 180 seconds after the start of the coating process is Ts + 0 ° C. or more, it is sufficiently cured. be able to.
  • the degree of curing in the curing step can be confirmed by measuring the gelation rate of the coating film.
  • the coating film may be rapidly cooled by blast, mist, shower, dipping, or the like.
  • a powder coating composition is attached to a spring body and then the spring body is heated.
  • a powder coating composition is applied to the surface of the spring body, and in the spring body, a coating portion having an uncured coating film and an uncured coating disposed between the coating portions are arranged.
  • a curing step of curing the uncured coating film of the painted part disposed between the two non-painted parts are examples of an application process for forming two non-coating parts having no film, an electrode connection process for connecting electrodes to each of the two non-coating parts, and applying a voltage between the electrodes to energize and heat the spring body.
  • a pretreatment step of forming the above-described phosphate film on the surface of the spring body may be performed.
  • a spring member having a coating film formed on the surface of the spring body is obtained.
  • the coating film formed on the surface of the spring body has a zinc-containing layer containing a relatively large amount of zinc powder formed on the surface side of the spring body, and the resin components of the epoxy resin and acid-terminated polyester resin are relatively A resin-containing layer containing a large amount is formed on the zinc-containing layer.
  • the coating film zinc powder is unevenly distributed on the surface side of the spring body, so even if the zinc content is small compared to the conventional coating film, the spring body and zinc are fully in contact with each other, resulting in higher anticorrosion properties.
  • the resin component is unevenly distributed on the surface layer side of the coating film, the impact from the outside is alleviated and the extension of cracks generated in the coating film is prevented.
  • the resin-containing layer is formed with a relatively thin layer thickness, the variation in the layer thickness is small and the sag resistance is improved without causing sag. And even if the layer thickness of the resin-containing layer is thin, it is formed integrally with the zinc-containing layer, so there is no clear interface between layers, and no delamination occurs.
  • the coating film of the present invention can realize a spring member that maintains high anticorrosion properties and has improved sag resistance due to the zinc-containing layer and the resin-containing layer. Further, these two layers do not need to be individually applied to each layer, and can be formed on the surface of the spring body by applying only one powder coating composition once.
  • FIG. 1 is a view showing a spring plate 1 according to the first embodiment of the present invention.
  • a leaf spring including one spring plate 1 is shown as an example of a spring member, but the present invention is not limited to this.
  • the spring plate 1 includes a spring body 10 and a coating film 11.
  • the spring body 10 is made of an iron-based material such as spring steel, and has a shape with a curved central portion as shown in FIG.
  • a coating film 11 is formed on the upper side surface 10 a on which the tensile force of the spring body 10 acts.
  • the coating film 11 is formed from a powder coating composition containing an epoxy resin, an acid-terminated polyester resin, and zinc powder. As described above, the zinc-containing layer containing a relatively large amount of zinc powder is formed on the surface side of the spring body 10, and the resin-containing layer containing a relatively large amount of the resin component is formed on the zinc-containing layer.
  • FIG. 2 is a view showing a lap spring plate 2 according to a second embodiment of the present invention.
  • the lap spring plate 2 is used, for example, in a leaf type suspension that connects a chassis and an axle.
  • the lap spring plate 2 includes a parent plate 3, a child plate 4, an interleaf 6, and a U bolt 7.
  • a coating film 8 and a coating film 9 are formed on the working surfaces 13a and 14a, respectively.
  • Both the coating film 8 and the coating film 9 are formed with the zinc-containing layer and the resin-containing layer as described above, the zinc-containing layer is located on the spring body 13, 14 side, and the reception-containing layer is located on the surface layer side. .
  • An interleaf 6 made of a zinc plate or a synthetic resin plate is extended between the parent plate 3 and the child plate 4 so as to prevent wear due to tightening of the U bolt 7. ing.
  • the method for painting the spring plate 1 of the present embodiment includes a painting process, an electrode connection process, a curing process, and a partial painting process.
  • the powder coating composition is coated on the surface of the spring body 10 to form a painted portion and two unpainted portions at both ends in the spring body 10.
  • a zinc phosphate film is formed after a shot peening treatment is performed in advance.
  • a powder coating composition is attached to the entire surface of the spring body 10 using a corona charging coating gun, and an uncured coating film made of the powder coating composition is formed.
  • the thickness of the uncured coating film is 60 to 100 ⁇ m.
  • the uncured coating film formed on the left and right ends of the spring body 10 is removed by blowing air with an air gun. Thereby, the spring body 10 is exposed at both left and right ends of the spring body 10. In this way, the spring main body 10 and a painted part made of an uncured coating film and two non-coating parts made only of the exposed spring main body 10 are formed.
  • electrodes are connected to the two non-painted portions formed on the spring body 10 respectively.
  • the electrode is connected to a power source by wiring.
  • a controller provided in the power supply controls voltage on / off, voltage value to be applied, and the like.
  • the power source is operated to apply a voltage between the electrodes, and the spring body 10 is energized and heated to cure the uncured coating on the painted part.
  • the power supply is turned on and a voltage is applied, a current flows through the spring body 10 of the painted portion, and Joule heat is generated.
  • the spring main body 10 is heated and the uncured coating film on the surface of the spring main body 10 is heated.
  • the temperature of a coating part reaches predetermined
  • the coating film 11 is formed by heating and curing the uncured coating film using an induction heating device. In this way, the coating film 11 is formed on the entire surface of the spring body 10 to manufacture the spring plate 1.
  • the present invention will be described in more detail with reference to examples and comparative examples, but the present invention is not limited to these.
  • surface represents a mass part unless there is special description.
  • a powder coating composition having the composition shown in Table 1 was manufactured by the above-described manufacturing method, and washer (outer diameter 40 mm, inner diameter 21 mm, thickness 2.9 mm, made of carbon steel (S45C)) was used as an object to be coated.
  • the test piece of Examples 1 and 2 was produced by electrostatic coating on one side of the washer so that the film thickness was 50 ⁇ m, and baking (post-heating) at 170 ° C. for 20 minutes.
  • a test piece of Example 3 was produced in the same manner as Example 1 except that the heating condition was preheating. In the preheating, the test piece was heated in advance so that the surface temperature of the test piece immediately before the powder coating composition was applied to the test piece was 180 ° C.
  • Patent Document 1 Japanese Patent Laid-Open No. 11-188309
  • a coating film composed of a first coating film and a second coating film was provided on one side of a washer in the same manner as in the example, and a comparison was made.
  • Example test specimens were prepared.
  • the first coating film was used for baking a leaf spring ZE primer manufactured by Shinto Paint Co., Ltd., and the tough coating chassis black manufactured by Rock Paint Co., Ltd. was used for the second coating film.
  • Example 2 a powder coating composition was produced according to the description in Example 3 of Patent Document 2 (Japanese Patent Laid-Open No. 2013-119582), and electrostatic coating was performed on one side of a washer in the same manner as in Example. The coating film was provided and the test piece for a comparative example was produced.
  • FIG. 3 is a schematic diagram for demonstrating the measuring method for measuring sag resistance.
  • four washers 100 are prepared for each of the examples and comparative examples, the surfaces on which the coating films are formed are overlapped, and the four washers 100 are sandwiched from above and below by a pair of pressing jigs 102, and thrust is applied.
  • a pair of pressing jigs 102 and four washers 100 are fixed to the base 101 with fastening bolts 104 via the bearings 103.
  • Strain gauges bolt axial force measurement gauge KFG-3-120-C20-11, manufactured by Kyowa Denki Co., Ltd.
  • KFG-3-120-C20-11 manufactured by Kyowa Denki Co., Ltd.
  • the washer 100 was fixed to the pedestal 101 with the fastening bolts 104, and was then placed in a thermostatic bath and allowed to stand at 60 ° C. for 48 hours.
  • the evaluation is based on the sag rate per unit film thickness. If the sag rate is less than 1% when the film thickness is 10 ⁇ m, the evaluation is good. Is judged to be defective. In this example, since the film thickness of the coating film is 50 ⁇ m, if the sag rate is less than 5%, the evaluation is “good”, and if the sag rate is 5% or more, the evaluation is “bad”. It was.
  • the neutral salt-water spray property was evaluated by the test method based on JISK5600-7-1 (5% sodium chloride aqueous solution with a liquid temperature of 35 degreeC sprayed for 840 hours). It was visually confirmed whether or not the sprayed coating film had an abnormality such as peeling or swelling. If there was no abnormality in the coating film, the evaluation was “good”. If the coating film was abnormal, the evaluation was “x”.
  • Example 1 a zinc-containing layer and a resin-containing layer were formed on the coating film, and the evaluation results were all good.
  • Comparative Example 1 since the second coating film is a resin coating film, it is inferior in sag resistance, and is often used by being fixed to a frame or the like by a fastening member such as a bolt. Is not applicable. Since the comparative example 2 is a coating film composed of one layer containing zinc powder, the sag resistance is good, but the corrosion resistance is inferior and cannot be applied as a coating film for a spring member.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Organic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Metallurgy (AREA)
  • Springs (AREA)
  • Paints Or Removers (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Laminated Bodies (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)

Abstract

La présente invention se rapporte à un élément ressort pouvant être fabriqué facilement à des fins d'amélioration de propriétés prescrites. Une plaque de ressort 1 est équipée d'un corps de ressort 10 et d'un revêtement pelliculaire 11. Le corps de ressort 10 comporte un matériau ferreux tel que de l'acier à ressorts, et la section centrale de celui-ci est incurvée. Le revêtement pelliculaire 11 est formé sur la surface supérieure 10a du corps de ressort 10 sur laquelle une force de traction agit. Le revêtement pelliculaire 11 est formé à partir d'une composition de revêtement en poudre contenant une résine époxy, une résine de polyester à terminaison acide, et une poudre de zinc. Ainsi, une couche contenant du zinc contenant une quantité relativement importante de poudre de zinc est formée sur le côté surface du corps de ressort 10, et une couche contenant une résine contenant une quantité relativement importante d'un composant de résine est formée sur la couche contenant du zinc.
PCT/JP2015/071892 2014-12-12 2015-07-31 Élément ressort WO2016092899A1 (fr)

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Publication number Priority date Publication date Assignee Title
JP2016113526A (ja) * 2014-12-12 2016-06-23 神東塗料株式会社 粉体塗料組成物
WO2017163877A1 (fr) * 2016-03-25 2017-09-28 中央発條株式会社 Ressort hautement durable et son procédé de revêtement
JP6772996B2 (ja) * 2017-09-28 2020-10-21 新東工業株式会社 防錆処理方法
WO2019137068A1 (fr) * 2018-01-12 2019-07-18 太仓卡兰平汽车零部件有限公司 Ressort floqué

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007198490A (ja) * 2006-01-26 2007-08-09 Chuo Spring Co Ltd 高耐久性ばねおよびその塗装方法
JP2007308067A (ja) * 2006-05-19 2007-11-29 Toyota Motor Corp サスペンションスプリング
JP2010242067A (ja) * 2009-04-03 2010-10-28 Rohm & Haas Co 耐腐蝕および耐チップ性粉体コーティング

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0994141B1 (fr) * 1998-10-15 2004-12-22 Morton International, Inc. Revêtement résistant à la corrosion et à l'écaillement pour acier à haute résistance
US6663968B2 (en) * 2000-11-01 2003-12-16 Rohm And Haas Company Corrosion-and chip-resistant coatings for high tensile steel
JP2013119582A (ja) * 2011-12-07 2013-06-17 Shinto Paint Co Ltd 金属亜鉛含有の粉体塗料組成物
JP2014018727A (ja) * 2012-07-17 2014-02-03 Chuo Spring Co Ltd ばね部材

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007198490A (ja) * 2006-01-26 2007-08-09 Chuo Spring Co Ltd 高耐久性ばねおよびその塗装方法
JP2007308067A (ja) * 2006-05-19 2007-11-29 Toyota Motor Corp サスペンションスプリング
JP2010242067A (ja) * 2009-04-03 2010-10-28 Rohm & Haas Co 耐腐蝕および耐チップ性粉体コーティング

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