US20100291327A1 - Uv-curable undercoat - Google Patents

Uv-curable undercoat Download PDF

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Publication number
US20100291327A1
US20100291327A1 US12/295,637 US29563707A US2010291327A1 US 20100291327 A1 US20100291327 A1 US 20100291327A1 US 29563707 A US29563707 A US 29563707A US 2010291327 A1 US2010291327 A1 US 2010291327A1
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US
United States
Prior art keywords
curing
barium sulfate
curing primer
acrylate
methacrylate
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Abandoned
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US12/295,637
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English (en)
Inventor
Thomas Rentschler
Horst Van Beek
Reinhold Kopp
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.)
Venator Germany GmbH
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Sachtleben Chemie GmbH
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Assigned to SACHTLEBEN CHEMIE GMBH reassignment SACHTLEBEN CHEMIE GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: RENTSCHLER, THOMAS, KOPP, REINHOLD, VAN BEEK, HORST
Publication of US20100291327A1 publication Critical patent/US20100291327A1/en
Abandoned legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/002—Priming paints
    • 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
    • C09D5/08—Anti-corrosive paints
    • C09D5/082—Anti-corrosive paints characterised by the anti-corrosive pigment
    • C09D5/084—Inorganic compounds
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/13—Hollow or container type article [e.g., tube, vase, etc.]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/13—Hollow or container type article [e.g., tube, vase, etc.]
    • Y10T428/1352—Polymer or resin containing [i.e., natural or synthetic]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/25—Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles
    • Y10T428/258—Alkali metal or alkaline earth metal or compound thereof
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
    • Y10T428/2982—Particulate matter [e.g., sphere, flake, etc.]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31678—Of metal
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31678—Of metal
    • Y10T428/31681—Next to polyester, polyamide or polyimide [e.g., alkyd, glue, or nylon, etc.]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31678—Of metal
    • Y10T428/31688—Next to aldehyde or ketone condensation product
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31678—Of metal
    • Y10T428/31692—Next to addition polymer from unsaturated monomers

Definitions

  • the present invention provides a UV-curing primer, the production thereof and the use of this primer.
  • the present invention provides a UV-curing primer for coil coating, which contains fine-particle barium sulfate, the production of this primer and its use.
  • coil coating means a special form of roller coating of cold-rolled metal strip. It involves a continuously operating process with throughput rates of up to 250 m/min. Under these conditions it is necessary for a primer to have very good flow and to cure rapidly so that a strip coating line can be kept as short as possible. UV curing is therefore preferable to heat curing. Since the metal strip is coiled after processing, the primer must be highly elastic.
  • the primer is the first coat in a multi-coat system and serves to promote the adhesion of the entire coat construction. In the case of coil coating, it should additionally offer the highest possible corrosion protection for the metal strip and the sheets produced therefrom.
  • the primer should also be completely or partly free from chromate-containing anti-corrosive pigments; these are ecologically unsound.
  • the prior art in the area of coil coating primers comprises in particular primers based on acrylates, and in particular primers based on epoxy acrylates, urethane acrylates or mixtures of these.
  • a known coil coating primer consists substantially of 90 parts acrylate binder, 5 parts Ebecryl 171 adhesion promoter and 5 parts Additol CPK UV initiator.
  • Primers based on this and similar compositions have the disadvantages of low corrosion protection and adhesion. Presumably as a result of the high elasticity of coatings with these and similar starting formulations which enable moisture and salts to penetrate to the metal, the corrosion protection is poor. However, high elasticity is extremely important in the coil coating sector because the metal strip is bent, or coiled. The primers have to yield to these mechanical stresses without cracking.
  • Curable compositions containing fine particles, particularly nanoparticles based on silicon dioxide or aluminium oxide, have also been known for a long time.
  • curable compositions which contain deagglomerated barium sulfate containing at least one dispersant and at least one crystallisation inhibitor. These curable compositions have high scratch resistance and improved chemical resistance.
  • the compositions disclosed in DE-A-10 2004 010 201 which may be used particularly in paints, are heat-cured.
  • WO-A-02/26852 discloses UV-curing coating compounds which contain barium sulfate, but without disclosing anything about the particle size of the barium sulfate. These coating compounds are used for the production of, among other things, clear lacquer coatings or coloured and special-effect one-coat finish coatings, base coats and multi-coat systems in coil coating. However, WO-A-02/26852 does not disclose a primer.
  • DE-A-4133290 also fails to disclose a primer and the particle size of the barium sulfate is only roughly outlined.
  • a use of the clear lacquer disclosed in DE-A-4133290 in coil coating is not disclosed.
  • the object of the present invention is to remedy the deficiency in the prior art.
  • the object of the present invention is to provide a UV-curing primer for coil coating which guarantees improved flow, which can dispense completely or partly with chromate-containing anti-corrosive pigments, the use of which makes it possible to dispense with an organic pre-treatment of the metal strip, which brings about improved corrosion protection and/or which possesses high elasticity.
  • the object is achieved by a UV-curing primer which contains fine-particle barium sulfate with an average particle size of 550 to 950 nm, preferably of 600 to 800 nm, particularly preferably of 650 to 750 nm, or an average particle size of 10 to 120 nm, preferably of 20 to 100 nm, particularly preferably of 30 to 80 nm, most particularly preferably of 40 to 60 nm.
  • a UV-curing primer which contains fine-particle barium sulfate with an average particle size of 550 to 950 nm, preferably of 600 to 800 nm, particularly preferably of 650 to 750 nm, or an average particle size of 10 to 120 nm, preferably of 20 to 100 nm, particularly preferably of 30 to 80 nm, most particularly preferably of 40 to 60 nm.
  • average particle size In connection with the barium sulfate used according to the invention, average particle size always means the median of the particle diameter.
  • the median can be determined e.g. by laser diffraction.
  • a primer of this type has not been known from the prior art up to the present.
  • the primer according to the invention when used, it is possible to dispense with the organic pre-treatment of the substrate.
  • the primer according to the invention contains preferably 40 to 80 wt. % binders, 20 to 45 wt. % reactive thinners, 2 to 10 wt. % UV initiators, 1 to 25 wt. %, preferably 2 to 15 wt. %, particularly preferably 5 to 12 wt. % barium sulfate, 0 to 10 wt. % additives, 0 to 15 wt. % coloured pigments and 0 to 15 wt. % anti-corrosive pigments.
  • the barium sulfate in the primer according to the invention has an average particle size of 550 to 950 nm, preferably of 600 to 800 nm, particularly preferably of 650 to 750 nm.
  • An example of a barium sulfate of this type is the product SACHTLEBEN micro from Sachtleben Chemie GmbH.
  • the barium sulfate has an average particle size of 10 to 120 nm, preferably of 20 to 100 nm, particularly preferably of 30 to 80 nm, most particularly preferably of 40 to 60 nm.
  • An example of a barium sulfate of this type is the product SACHTOPERSE HU-N from Sachtleben Chemie GmbH.
  • the barium sulfate according to the invention is preferably a so-called BLANC FIXE product. This is produced synthetically by a precipitation process. In this process, contaminants are largely eliminated and a narrow, defined particle size and particle size distribution are established.
  • the precipitated barium sulfate is washed, dried and ground. The grinding can take place using pin mills or jet milling.
  • the barium sulfate according to the invention can be coated with an organic substance which acts as a grinding aid during production and as a dispersing aid in the coating.
  • Organic substances typically used are TMP (trimethylolpropane), TME (trimethylolethane), TEA (triethylene amine) or polyacrylates.
  • the barium sulfate according to the invention may originate from natural raw materials, which has been worked up by processes according to the prior art, e.g. cleaning and grinding.
  • compounds preferably used as binders are those with a UV-curing acrylate or methacrylate function or several UV-curing acrylate or methacrylate functions, preferably selected from epoxy acrylates, polyurethane acrylates, melamine acrylates, polyester acrylates, polyether acrylates, silicone acrylates, epoxy methacrylates, polyurethane methacrylates, melamine methacrylates, polyester methacrylates, polyether methacrylates, silicone methacrylates, unsaturated acrylic, methacrylic or polyester resins or mixtures of at least two of these compounds.
  • a UV-curing acrylate or methacrylate function or several UV-curing acrylate or methacrylate functions preferably selected from epoxy acrylates, polyurethane acrylates, melamine acrylates, polyester acrylates, polyether acrylates, silicone acrylates, epoxy methacrylates, polyurethane methacrylates, melamine methacrylates, polyester methacrylates, polyether methacryl
  • Reactive thinners are styrene, mono-, di-, tri- or tetrafunctional acrylates or mono-, di-, tri- or tetrafunctional methacrylates or mixtures of at least two of these.
  • Reactive thinners are thinners for reducing the viscosity of the binders and become a component of the binder during film formation by a chemical reaction, i.e. they copolymerise. They are usually structurally related monomers of the binder.
  • the UV initiator according to the invention is preferably selected from benzophenone, benzoin ether, benzil, benzil ketal, ⁇ -hydroxyalkylphenone, ⁇ -aminoalkylphenone, benzoyl phosphine oxide or derivatives thereof. Mixtures of two or more of these compounds are also often used to optimise reactivity and in-depth cure. The use of the UV initiator is adapted to the binder here.
  • Adhesion promoters are preferably used according to the invention as additives.
  • the primer according to the invention can contain inorganic or organic colorants for colouring and covering the substrate, for example white pigments, coloured pigments, black pigments or dyes. In the case of primers intended to give transparent coatings, no colouring substance is added.
  • the anti-corrosive pigments that may be used in the primer according to the invention are organic inhibitors or inorganic anti-corrosive pigments, e.g. metal phosphates, metal phosphosilicates or ion-exchange pigments, or mixtures of these compounds.
  • the UV-curing primer according to the invention can also be produced by adding and incorporating barium sulfate according to the invention into a commercial UV-curing primer by processes according to the prior art.
  • the primer according to the invention is preferably used for coil coating to protect the substrate from corrosion and/or to achieve uniform flow of the coating on the substrate.
  • the primer according to the invention is used to protect the respective substrate from corrosion and/or to achieve uniform flow of the coating on the substrate.
  • Typical substrates on which the primer according to the invention is used consist for example of steel or aluminium, again for example in the form of sheets.
  • the steel can be used without metallic pre-modification or with electrolytic galvanisation or with a hot-dip finish, e.g. with zinc.
  • the substrates of steel or aluminium may be pretreated with organic chemicals for corrosion protection. According to the invention, however, it is also possible to dispense with the pretreatment of the substrates using organic chemicals.
  • the UV-curing primer according to the invention may optionally be coated with a heat-curing top coat, e.g. based on a polyester, polyester-melamine, polyurethane or PVDF binder system.
  • a heat-curing top coat e.g. based on a polyester, polyester-melamine, polyurethane or PVDF binder system.
  • the coating is preferably applied by roller or flood coating methods of application.
  • UV-curing primer according to the invention can be used e.g. for the coating of planar objects such as wooden boards, fibreboards such as MDF (medium-density fibreboard), laminates, paper and/or films.
  • planar objects such as wooden boards, fibreboards such as MDF (medium-density fibreboard), laminates, paper and/or films.
  • MDF medium-density fibreboard
  • Typical applications of the substrates coated with the UV-curing composition according to the invention are e.g. add-on parts for roofs and facades, partition walls, ceiling elements, shop fittings, cupboards, shelves, domestic appliances, machine casings, doors, gates, lights, wheel rims, add-on parts for car bodies and caravans.
  • the formulation constituents are predispersed for 10 minutes in a high-speed mixer and then dispersed in a Skandex or with a bead mill.
  • a 150 g batch of the composition is placed in a 500 ml Kautex bottle for this purpose with 500 g glass beads measuring 2 mm.
  • the fineness of dispersion is then tested with a Hegmann gauge.
  • the dispersing is continued until the desired fineness is achieved; in the present case after 3 hours' Skandex a fineness of less than or equal to 6 ⁇ m.
  • a corresponding comparative sample (formulation 1) contains no barium sulfate.
  • the batch of primer screened off from the beads is applied on to freshly cleaned sheets (non-galvanised steel) using a wire-wound coating rod and irradiated with the UV curing device (Eltosh, 2 passes at 120 W/cm 2 , 3 m/min).
  • the coat produced on the substrate with the primer based on formulation 2 displays a smoother surface and better flow than the coat produced on the substrate with the primer based on formulation 1.
  • both coatings behave very well in terms of adhesion and elasticity (ball impact, rapid deformation).
  • the coat produced with the primer based on formulation 1 displays slightly better elasticity.
  • the corrosion test is repeated for a coat thickness of 50 ⁇ m.
  • the results of the corrosion tests are presented in the following Table 2.
  • the degree of rusting is evaluated in accordance with DIN 53210 and the degree of blistering in accordance with DIN 53209:
  • FIG. 1 a shows the result of the 50-hour salt spray test for a 13 ⁇ m coat thickness with the coat produced using the primer based on formulation 1
  • FIG. 1 b shows the result of the 50-hour salt spray test for a 13 ⁇ m coat thickness with the coat produced using the primer based on formulation 2.
  • FIG. 2 a shows the result of the 400-hour salt spray test for a 50 ⁇ m coat thickness with the coat produced using the primer based on formulation 1
  • FIG. 2 b shows the result of the 400-hour salt spray test for a 50 ⁇ m coat thickness with the coat produced using the primer based on formulation 2.
  • Table 3 shows formulations for primers based on epoxy acrylate, Ebecryl EB 3213 (Cytec), 75%, with the content of barium sulfate adjusted to between 0 and 15%.
  • the average particle size of the barium sulfate is 50 nm.
  • DPGDA dipropylene glycol diacrylate
  • HDDA hexanediol diacrylate
  • Ebecryl 171 (Cytec) is an adhesion promoter
  • HDMAP 2-hydroxy-2-methyl-propiophenone
  • All contents are given in percent by weight (wt. %).
  • a 10 ⁇ m thick coat is produced on untreated steel plates as in the process described in example 1.
  • Table 4 shows the mechanical properties of the coats produced with the formulations listed in table 3:
  • FIG. 3 shows the results of the corrosion protection test after 100 hours' corrosion testing on untreated steel with a 10 ⁇ m coat thickness:
  • FIG. 4 shows the results of the corrosion protection test after 150 hours' corrosion testing on untreated steel with a 10 ⁇ m coat thickness:
  • Table 5 shows formulations for primers based on urethane acrylate, Ebecryl EB 8307 (Cytec), 70%.
  • the barium sulfate content is adjusted to 0 and 10%.
  • the average particle size of the barium sulfate is 50 nm. All contents are given in percent by weight (wt. %).
  • a 10- ⁇ m-thick coat is produced on untreated steel plates as in the process described in example 10
  • Table 6 shows the mechanical properties of the coats produced with primers based on the formulations listed in table 5:
  • FIG. 5 shows the results of the corrosion protection test after 100 hours' corrosion testing on untreated steel with a 10 ⁇ m coat thickness:
  • FIG. 5 a Formulation 8;
  • FIG. 5 b Formulation 9;
  • FIG. 6 shows the results of the corrosion protection test after 150 hours' corrosion testing on untreated steel with a 10 ⁇ m coat thickness:
  • FIG. 6 a Formulation 8;
  • FIG. 6 b Formulation 9;
  • a formulation 10 based on formulation 1 is produced with the addition of 5 wt. % barium sulfate as in the process described in example 1.
  • the average particle size of the barium sulfate is 50 nm.
  • a 10 ⁇ m thick coat both, without barium sulfate (formulation 1) and with barium sulfate (formulation 10) is produced on galvanised steel sheets. The coatings are then scratched along the length in order to simulate damage.
  • FIG. 7 shows the results of the corrosion protection test after 150 hours of corrosion testing on galvanised steel with a 10 ⁇ m coat thickness:
  • FIG. 7 a formulation 1
  • FIG. 7 b formulation 10.
  • the evaluation of the test shows that the primers according to the invention significantly reduce creep corrosion along the scratch.
  • FIG. 8 Formulation 11, reference, only Shieldex
  • FIG. 9 Barium sulfate with 50 nm average particle size
  • FIG. 10 Barium sulfate with 500 nm average particle size
  • FIG. 11 Barium sulfate with 700 nm average particle size
  • FIG. 12 Barium sulfate with 1000 nm average particle size
  • the Figures show that corrosion protection is improved by the use of barium sulfate. With an increasing content of barium sulfate, the protective effect improves.
  • a barium sulfate with an average particle size of 700 nm displays a greater action than one with an average particle size of 1000 nm or 500 nm.
  • a barium sulfate with an average particle size of 50 nm displays a greater action than one with an average particle size of 1000 nm or 500 nm.
  • a UV-curing primer formulation (formulation 12) with Laromer binders and monomer (both BASF), barium sulfate with different particle sizes is mixed in using a bead mill in a proportion of 10 wt. % in each case.
  • This formulation contains as a constant constituent 5 wt. % Shieldex C 303 (Grace) as an active anti-corrosive pigment.
  • Untreated steel sheets are coated in a thickness of 10 ⁇ m and tested for 75 hours in a salt spray test.
  • FIG. 13 Formulation 12 with barium sulfate with 700 nm average particle size
  • FIG. 14 Formulation 12 with barium sulfate with 500 nm average particle size.
  • Example 6 confirms the result obtained in example that the use of barium sulfate with an average particle size of 700 nm is more advantageous than the use of barium sulfate with an average particle size of 500 nm.
  • FIG. 15 Formulation 13 with barium sulfate with 700 nm average particle size
  • FIG. 16 Formulation 13 with barium sulfate with 500 nm average particle size.
  • Formulations based on the formulations of example 2 were produced with the addition of 5 wt. % (formulation 5, (a) in each of the Figures), 10 wt. % (formulation 6, (b) in each of the Figures) and 15 wt. % (formulation 7, (c) in each of the Figures) of different barium sulfates as in the process described in example 2.
  • the average particle size of the barium sulfate varied from 50 nm to 1000 nm.
  • a 10- ⁇ m-thick coat of each formulation was produced on untreated steel sheets.
  • FIGS. 17 to 22 show the results of the corrosion protection test after 100 hours of corrosion testing.
  • FIG. 17 Reference without barium sulfate (formulation 3);
  • FIG. 18 Barium sulfate with 50 nm average particle size
  • FIG. 19 Barium sulfate with 200 nm average particle size
  • FIG. 20 Barium sulfate with 500 nm average particle size
  • FIG. 21 Barium sulfate with 700 nm average particle size
  • FIG. 22 Barium sulfate with 1000 nm average particle size.
  • the evaluation of the test shows that the primers according to the invention are particularly advantageous in corrosion protection when the barium sulfates employed have particle sizes in ranges that are significantly lower than 200 nm or between 500 nm and 1000 nm.

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Paints Or Removers (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Laminated Bodies (AREA)
US12/295,637 2006-04-27 2007-04-27 Uv-curable undercoat Abandoned US20100291327A1 (en)

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DE102006020263.5 2006-04-27
DE102006020263 2006-04-27
PCT/EP2007/054155 WO2007125099A1 (de) 2006-04-27 2007-04-27 Uv-härtbare grundierung

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EP (2) EP2013294A1 (pt)
BR (2) BRPI0710865A2 (pt)
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DE (1) DE102007020468A1 (pt)
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US11938751B2 (en) 2010-03-05 2024-03-26 Flooring Industies Limited, Sarl Method for manufacturing a floor board

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US20090169783A1 (en) 2009-07-02
CA2650477A1 (en) 2007-11-08
BRPI0710795A2 (pt) 2011-06-21
CA2650477C (en) 2014-10-14
BRPI0710865A2 (pt) 2011-06-21
WO2007125099A1 (de) 2007-11-08
DE102007020468A1 (de) 2007-10-31
WO2007125098A1 (de) 2007-11-08
CA2650476A1 (en) 2007-11-08
US8114513B2 (en) 2012-02-14
EP2013293A1 (de) 2009-01-14

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