EP2571944A1 - Procédé de production d'une composition de revêtement présentant une variation de teinte réversible et servant à conférer des propriétés d'absorption uv à des substrats - Google Patents

Procédé de production d'une composition de revêtement présentant une variation de teinte réversible et servant à conférer des propriétés d'absorption uv à des substrats

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Publication number
EP2571944A1
EP2571944A1 EP11741091A EP11741091A EP2571944A1 EP 2571944 A1 EP2571944 A1 EP 2571944A1 EP 11741091 A EP11741091 A EP 11741091A EP 11741091 A EP11741091 A EP 11741091A EP 2571944 A1 EP2571944 A1 EP 2571944A1
Authority
EP
European Patent Office
Prior art keywords
solution
additive
solvent
added
coating composition
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Withdrawn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
EP11741091A
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German (de)
English (en)
Inventor
Peter Graf
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.)
Graf Thorsten
Original Assignee
Graf Thorsten
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Filing date
Publication date
Application filed by Graf Thorsten filed Critical Graf Thorsten
Publication of EP2571944A1 publication Critical patent/EP2571944A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • C09D5/29—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes for multicolour effects
    • 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
    • C09D133/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
    • C09D133/04—Homopolymers or copolymers of esters
    • C09D133/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
    • C09D133/08—Homopolymers or copolymers of acrylic acid esters
    • 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
    • C09D133/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
    • C09D133/04—Homopolymers or copolymers of esters
    • C09D133/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
    • C09D133/10—Homopolymers or copolymers of methacrylic acid esters
    • C09D133/12—Homopolymers or copolymers of methyl methacrylate
    • 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

Definitions

  • the invention relates to a process for preparing a reversible hue change coating composition for the UV light absorbing equipment of substrates.
  • Such coating compositions with reversible color change are used, for example, to darken transparent surfaces such as windows, glazings, plastic surfaces, films, spectacle lenses, etc. in a targeted manner under UV irradiation.
  • the prior art proposes according to DE 10 2005 042 002 A1 a correspondingly constructed multifunctional layer, which represents a significant contribution to the development of safety. This is especially true in the case that transparent sun visors are equipped with a suitably designed coating composition.
  • the ability to reversibly change hue makes the coating composition able to provide unrestricted daytime and nighttime visibility. Only in the case of solar radiation and in this context additionally existing UV light, the desired darkening takes place.
  • a coating has become known from WO 03/018696 A1, which absorbs UV light.
  • the coating in question is used to equip bottles for the storage of drinks (beer).
  • inorganic oxide materials selected from the group consisting of zinc oxides, titanium dioxides, etc., function.
  • the present coating compositions and associated methods can not be completely satisfactory.
  • special preparatory measures are required to make the substrate to be coated suitable for application of the coating composition.
  • the coated substrates are often of their mechanical properties disappointing. This is especially true when the coated substrate is to be deformed, for example, in a downstream processing step. Because such procedures often lead to the applied coating composition flaking off, showing cracks or otherwise being damaged. -
  • the invention aims to provide a total remedy.
  • the invention is based on the technical problem of providing such a method for producing a coating composition and a coating composition applied in this way to a substrate, by means of which the UV-absorbing equipment of the relevant substrate can be easily, permanently and inexpensively succeed and at the same time the possibility of subsequent processing of the coated substrate is opened.
  • a process for the preparation of a reversible shade change coating composition for the UV light-absorbing finish of substrates based on a polymeric paint is characterized by the following process steps:
  • a solvent (A, B) is coated with an acrylate-based binder (C)
  • the solvent (A, B) prepared in the first process step is generally an alcohol-based organic solvent (A, B). These may be alkanols, ie a group of substances derived from alkanes.
  • the invention recommends recourse to a solvent mixture of different alcohols.
  • a first solvent (A) based on acetone and a second solvent (B) based on a polyhydric alkanol have proven to be particularly favorable.
  • the first solvent (A) based on acetone provides in particular for the dissolution of the subsequently introduced binder (C).
  • that represents second solvent (B) based on a polyhydric alkanol primarily to ensure that the photochromic dye (H) added to the solution (A, B, C) undergoes a solution.
  • a particularly stable dispersion of the photochromic dye (H) usually added in powder form in the solution is made available.
  • the first alcoholic solvent (A) based on acetone may advantageously be diacetone alcohol (DAA).
  • DAA diacetone alcohol
  • a second solvent (B) based on the polyhydric alkanol recourse to 1, 2-propanediol is recommended.
  • Both solvents mentioned (A, B) can be easily mixed with each other and ensure on the one hand for a perfect dissolution of the introduced into the mixture binder (C) based on acrylate and on the other hand ensure that the subsequently added photochromic dye (H) is also properly dissolved or a total stable dispersion of the photochromic dye (H) is carried out in the solution.
  • solvents A and B are used according to the invention, which are selected from the group comprising acetone, ethanol, ethyl acetate, ethylene glycol, tetrahydrofuran, methylene chloride, methanol, dioxane, butyl acetate, isopropanol.
  • the binder (C) is one based on acrylate. This may be added as a powdery substance to the solution or solvent (A, B) described above in detail. In order to accelerate at this point the solution of the powdered binder (C) in the solvent or the mixture of the two solvents described (A, B), it is recommended that the solvent (A, B) with the introduced powdered binder (C. ) too mix, for example, by the solvent (A, B) is processed with the binder (C) in a stirred tank. In this case, a so-called toothed disk has proved to be particularly favorable as a stirring body. In addition, it is recommended to heat the solvent (A, B) or the solvent mixture.
  • the heating is limited to values of well below 100 ° C.
  • a warming in the steam is recommended, which is particularly gentle and avoids local overheating. That is, before or during the addition of the acrylate-based binder (C), the solvent (A, B) or the solvent mixture is heated. The heating generally takes place in a water bath. In this case, temperatures of well below 100 ° C are usually set, usually even below 80 ° C. In fact, a temperature of about 60 ° C for the water bath and thus the solvent (A, B) has proven to be particularly favorable and for the desired solution of the binder (C) and then the photochromic dye (H) as completely sufficient.
  • the invention recommends a powdery adhesive, for example methacrylate adhesive or a binder based on methacrylate, as binder (C) based on acrylate.
  • This binder (C) provides the subsequent curing of the paint produced on the substrate primarily for the desired polymerization.
  • binder (C) one or more of the (co) polymers used from the group comprising polymethyl methacrylate, co-poly (butyl acrylate-styrene 45:55), polycarbonate, cellulose triacetate, polybutyl methacrylate, polyester, polyurethane, polyamides , Copolymers of vinylidene chloride and acrylic esters, acrylonitrile copolymers and mixtures of (meth) acrylic-modified polymers with reactive solvents such as hexanediol diacrylate or trimethylolpropane triacrylate.
  • one or more additives can be added to the solution (A, B, C) or the solvent (A, B) with the incorporated acrylate-based binder (C), but these are not obligatory are.
  • an additive which increases the surface tension of the prepared solution (A, B, C) and consequently also of the varnish produced therefrom.
  • This additive (D) may be a silicon-based inorganic polymer or a silicone, respectively.
  • the reduction of the surface tension of the solution (A, B, C) is carried out purely physically with the aid of the relevant additive (D).
  • the described reduction of the surface tension is of importance insofar as the polymeric varnish produced in this way can be applied to different substrates.
  • a polydimethylsiloxane is used, which may also be modified by polyether.
  • Said siloxane is particularly suitable for the desired purpose in that it is colorless, transparent and chemically inert and non-toxic.
  • the produced polymeric varnish is only positively provided by the additive (D) in question with respect to its wetting ability when applied to the desired substrate, without fear of any adverse effects.
  • the described additive (D) for reducing the surface tension prevents any foaming on stirring the solution (A, B, C) or upon stirring the binder (C) and / or the photochromic dye (H).
  • a dispersant can be used, which is advantageously added to the solution before the addition of the photochromic dye (H).
  • This additive (E) or dispersant is based on a polyacrylate.
  • a silicone-modified polyacrylate is used as the relevant additive (E).
  • These are special plastics, namely polymeric esters of acrylic acid and of acrylic acid derivatives with alcohols. These are used in the context of the invention as a dispersant, thus ensuring in the preparation of the desired solution that it comes to optimal mixing of the individual immiscible phases respectively substances respectively the individual phases are stabilized.
  • the additive provides (E) or the additive (E) based primarily on polyacrylates and used primarily as a dispersant, for the particles of the photochromic dye (H) subsequently introduced into the solution (A, B, C) to be incorporated into the liquid without fail, or herein experience stable flooding. This ensures a uniform distribution of the particles or pigments of the subsequently introduced photochromic dye (H) in the solution.
  • the additive (E) acting as a dispersing agent and additionally described above additionally ensures that the surface wetting on the substrate is improved in addition to the surface tension-reducing additive (D). Furthermore, the dispersant-acting additive (E) ensures that the polymeric paint applied to the substrate has excellent surface finish and smoothness. As a result, its overall weather resistance and water resistance is improved and, for example, a film equipped herewith can be easily removed from a substrate, for example a glass pane. The release properties of a film coated with the lacquer according to the invention from the relevant glass pane are thus positively influenced because a particularly smooth and non-porous surface of the applied coating composition with high gloss is made available by the described additive (E), which acts as a dispersant.
  • the invention recommends the optional addition of a so-called light stabilizer (F).
  • a so-called light stabilizer is essentially used to stabilize the paint produced in terms of its photosensitivity and also to provide a durable upgrade against weathering.
  • acrylate-based additives (F) for example acrylic resins or even polyurethanes, have proven to be particularly favorable.
  • the resins in question ensure that the coating remains durable and firm after it has hardened.
  • a good appearance, a good gloss and a high weather resistance is observed.
  • one- and two-component polyurethanes can be used.
  • the acrylates or acrylic resins can be designed to cure photoinitiated, in which the radical polymerization is thus carried out by UV or visible light.
  • thermosetting acrylic resins are conceivable and can be used.
  • the photochromic dye incorporated into the solution (H) is one which reacts to UV light irradiation with a reversible color change.
  • the UV light is present predominantly as part of the sunlight, but can also provide in the context of so-called black light for the described reversible change in hue.
  • the UV light impinging on the photochromic dye alters the chemical structure of the particular dye and thus its absorption behavior.
  • the photochromic dye (H) as powder or plastic granules of the solution (A, B, C) is added.
  • the addition of the photochromic dye (H) is carried out with simultaneous stirring of the relevant solution (A, B, C).
  • the additive (E) which acts as a dispersant and which is prepared on the basis of a particularly silicone-modified polyacrylate and ensures a uniform distribution of the individual pigments in the solution, is advantageously present in the solution.
  • the photochromic dyes (H) in question are available in various shades, so that the color of the coating composition or of the polymeric coating produced in this way can be adjusted individually.
  • the effect of photochromism on both inorganic and organic compounds is observed. This manifests itself in a visible or ultraviolet light caused reversible conversion of the corresponding substance into another, which differs from the starting compound by its color (its absorption spectrum).
  • the so-called reverse reaction is triggered by light of different wavelengths or by heat. It can be spontaneous. This has long been known, for which reference is made, for example, to "Römpp, Chemielexikon, Stuttgart / New York, 1991, Volume 4, page 3403".
  • UV-sensitive photochromic spirooxazine compounds is described.
  • Such compounds can also be used within the scope of the invention as photochromic dyes.
  • photochromic dyes In the case of organic photochromic dyes, it is known that they become fatigued over time and in particular are destroyed by oxidation.
  • the so-called number of cycles is known as an important parameter with the aid of which photochromic dyes (H) or also compounds produced therefrom are characterized.
  • the Zso value indicates after how many staining / decolorization cycles the initial absorbance value has decreased by half.
  • the inventively provided photochromic dye (H) is selected from the group comprising benzopyrans, naphthopyrans, fluorenopyrans, spiropyranes, spirooxazines, spirodihydroindolizines, chromenes, azo compounds, anils, polycyclic quinones, viologens, diarylethenes, triarylmethanes, fulgides, fulgimides.
  • photochromic dyes come into consideration: in the 2,2-position aromatic or heteroaromatic substituted
  • the photochromic dyes used are spirofluorenopyrans of the formula (PF-I):
  • R 1 is a substituent selected from the group A consisting of (C 1 to C 6 ) alkyl, (C 1 to C 6 ) alkoxy, phenyl, bromine, chlorine and fluorine;
  • R 2 , R 3 , R 4 are independent are the same or different and represent a substituent selected from the group A 'consisting of hydrogen and the substituents of the group A, or (R 1 together with R 2 ) and / or (R 3 together with R 4 ) independently represent an unsubstituted, mono- or disubstituted benzo or pyrido ring, the substituents of which are selected from group A;
  • G including the spiro carbon atom represents a 5- to 8-membered ring to which at least one aromatic or heteroaromatic ring system is fused, the ring system (s) being selected from the group E consisting of benzene, naphthalene, phenanthrene, pyridine, Quinoline, furan, thi
  • phenyl or naphthyl which are unsubstituted, mono-, di- and trisubstituted; or b) the heterocycles pyridyl, furanyl, benzofuranyl, thienyl, benzothienyl and julolidinyl, which are unsubstituted, monosubstituted or disubstituted; where the substituent (s) of the aryl or heteroaryl groups in a) and
  • a group F consisting of hydroxy, amino, mono- (Ci to Ce) - alkylamino, di (Ci to C6) -alkylamino, mono- or disubstituted mono- and diphenylamino on the phenyl ring, piperidinyl, N -substituted piperazinyl, pyrrolidinyl, imidazolidinyl, pyrazolidinyl, indolinyl, morpholinyl, carbazolyl, mono-, di- and disubstituted pyrryl, (Ci to C 6 ) -alkyl, (Ci to C 6 ) - alkoxy, bromine, chlorine and fluorine are selected wherein the substituent (s) on the aromatic and heteroaromatic are selected from the group consisting of (C 1 to C 6 ) alkyl, (C 1 to C 6 ) alkoxy, bromine, chlorine and fluorine; or
  • ring system G represents a 5-membered to 8-membered ring. At least one aromatic or heteroaromatic ring system is fused to this ring.
  • the annelated ring system (s) may independently of one another be selected from the group consisting of benzene, naphthalene, phenanthrene, pyridine, quinoline, furan, thiophene, pyrrole, benzofuran, benzothiophene, indole and carbazole.
  • the ring systems may be both unsubstituted and mono- or disubstituted, with the substituent (s) selected from group A as defined above.
  • C3 to C12 spiro-monocyclic is understood to mean a 3-membered to 12-membered ring known to the person skilled in the art.
  • Orbis ci-spiro-bicyclic systems which may be present according to the invention, belong to the knowledge of the person skilled in the art. Examples include Norbornan, norbornene, 2,5-norbornadiene, Norcaran and Pinan called.
  • a known spirotricyclic system useful in the invention is, for example, adamantane.
  • PF-II spirofluorenopyrans of the formula (PF-II): wherein R 1 to R 4 , B and B 'are as defined above; X
  • X in the present invention description is referred to as a "single bond", it means that there is an immediate link between the ring systems C and C to be linked, for. no other atom should serve as bridging.
  • X represents a single bond, wherein the two existing ring systems C and C are bridged by a further linkage in ortho.ortho'-position to the first linkage.
  • Such bridging includes any means known to those skilled in the art to join the two ring systems C and C, such as heteroatoms such as oxygen or sulfur, saturated or unsaturated C 2 to C 5 carbon chains, or the like.
  • heteroatoms such as oxygen or sulfur
  • the further linkage in ortho, ortho'-position can lead to a 4,5-phenanthryl-spiro compound, wherein the spiro compounds according to the invention can then have the following general structure (PF-III):
  • B and B ' are selected independently of one another from the group a) or d).
  • B and B ' are particularly preferably independently of one another mono- or monosubstituted phenyl or naphthyl, where the substituent is in each case selected from group F as defined above.
  • B and B ' may also be the same substituents.
  • C and C independently of one another are unsubstituted or monosubstituted phenyl or naphthyl, the substituent in each case being selected from group A. Also, C and C may represent the same substituents.
  • photochromic dyes which are particularly advantageous in the context of the present invention are the following dyes of the formula (PF-IV) and in particular the following dyes of the formula (PF-V):
  • the polymeric coating prepared by the process of the invention significantly improves the stability of such photochromic dyes (H) or generally photochromic materials, including those based on organic. In fact, even after two years of intense and alternating irradiation with UV light, no significant changes in the absorption behavior are observed.
  • the resistance of photochromic materials is usually given by the Z 5 o value.
  • the Z 5 o value corresponds to the number of switching cycles at which the maximum photochromic absorption coefficient in the visible wavelength range (ie in the range from 380 to 780 nm) drops to half of its initial value.
  • the term switching cycle designates a transition of the photochromic material from low to increased absorption induced by electromagnetic radiation, in particular by UV light, and the return to the initial state, after switching off the exciting radiation.
  • coated transparent polymeric substrates have cyclic irradiation with daylight or with light from a wavelength band of 280 to 780 nm Z 5 o value greater than 8000, preferably greater than 10,000, especially greater than 15,000 and more preferably greater than 20,000.
  • the solution (A, B, C) additionally a UV absorber (G) is added as a further additive (G), which on the one hand prevents the present in the finished paint photochromic dyes (H) are not decomposed by light and UV light in particular and on the other hand lets enough UV light through to provide with the help of the embedded photochromic dye (H) for the desired reversible hue change ,
  • the UV absorber (G) optionally added to the solution thus ensures stabilization of the solution or of the paint produced.
  • UV absorbers (G) so-called sunscreen filter substances are used.
  • the UV absorbers (G) used in the context of the invention are generally those based on triazine.
  • triazines are a class of chemical compounds whose basic structure is an aromatic heterocycle.
  • a 1, 3,5-triazine compound is used, in which the heterocycle or six-membered ring consists of three alternately arranged carbon and nitrogen atoms.
  • the ability of such triazine compounds to be able to react to ultraviolet radiation has long been known, for which reference is made, by way of example only, to DE 1 184 761.
  • the use of triazine compounds to protect higher molecular weight organic compounds against ultraviolet radiation is described.
  • the invention recommends the use of a special UV absorber or a specific 1, 3, 5-triazine compound.
  • HPT hydroxyphenyl-triazine
  • the paint according to the invention is coated on polymeric substrates and on glass.
  • polymeric substrates there are preferably used sheets or sheets of polymers such as polycarbonate, polyethylene terephthalate, polymethyl methacrylate, polyvinyl chloride, polyvinyl butyral and / or mixtures thereof, optionally containing 0 to 15% by weight of additive based on the total weight of the substrate material.
  • the substrates are coated by means of flooding or dipping, by spraying, knife coating, screen printing, curtain casting, dip or spin coating.
  • the paint of the invention is suitable for the coating of large-area substrates, such as film webs.
  • the invention comprises substrates coated with the lacquer according to the invention and having an area of from 1 to 100 mm 2 , from 0.01 to 1.0 m 2 , from 1 to 100 m 2 , from 100 to 1000 m 2 , from 1000 to 10000 m 2 and from 10,000 to 100,000 m 2 . Due to the good processing properties of the paint according to the invention, there is no size limitation with regard to the size of the coated substrates. In particular, film webs can be coated in the roll-to-roll process with the paint according to the invention.
  • the lacquer according to the invention has a very good adhesion to polymeric substrates.
  • Substrates coated with the lacquer according to the invention can be hot-formed at temperatures of up to 150 ° C., preferably up to 170 ° C. and in particular up to 190 ° C.
  • the deformation is carried out by deep drawing.
  • the invention comprises coated, planar or three-dimensionally contoured substrates or shaped bodies with the lacquer according to the invention.
  • Coated and hot-shaped polymeric substrates coated with the coating according to the invention are characterized in that the coating is virtually free of cracks and spalling.
  • the surface density of defects detectable by optical film inspection systems or scanners with a maximum lateral dimension of greater than or equal to 1 ⁇ m is less than 10 m "2 , preferably less than 5 m " 2 , in particular less than 1 m "2 , and particularly preferably less than 0, 1 m "2 .
  • the above defect densities are measured on substrates coated with the lacquer according to the invention and on substrates coated with the lacquer according to the invention and hot-formed. embodiment
  • a solvent (A, B) is prepared as a solvent mixture of diacetone alcohol and 1, 2-propanediol.
  • about 40% by weight of the solvent (A) or of the diacetone alcohol is mixed with about 44% by weight of the solvent (B) or 1,2-propanediol in the example.
  • the solvent mixture is heated in a water bath to about 60 ° C.
  • a binder (C) in the specific example, methyl methacrylate, added, in an amount of about 11 wt .-%.
  • the stirring body may be a toothed disk. This has in the example case a diameter of 70 mm and rotates at about 4000 to 5000 revolutions / min. The stirring is carried out for about one hour.
  • additives for reducing the surface tension, specifically polydimethylsiloxane to 0.3 wt .-%.
  • additive (E) is added as a dispersant to the solution with stirring. This is polyacrylate in an amount of about 3 wt .-%.
  • the solution thus prepared is added with further stirring the mentioned light stabilizer (F). Specifically, this is acrylic resin in an amount of about 0.5 wt .-%. Finally, the solution of UV absorber (G) is added with further stirring, in an amount of about 1 wt .-%.
  • the UV absorber (G) used is hydroxyphenyltriacin in liquid form.
  • the solution thus prepared (A, B, C, D, E, F, G) is finished with constant stirring after about 1 hour. That is, the paint requires a production time in the specified frame of about 1 hour.
  • the photochromic dye (H) of the solution or the paint is added. This may be such as has been described in the previously referred to DE 196 43 773 A1. Its amount is 0.2 wt .-%.
  • the photochromic dye (H) is added with continued stirring to the solution (A, B, C, D, E, F, G). The stirring is then continued for about 8 to 12 hours. Thereafter, the lacquer or the coating composition according to the invention is ready and can be stored or applied directly to the desired substrate.
  • Example of use Example of use:
  • the polymeric acrylic varnish prepared in this way and equipped with the photochromic dye (H) is then applied to an associated substrate and cured.
  • the application of the paint, including the photochromic dye (H) or correspondingly acting pigments can be carried out using conventional coating methods.
  • the paint can be rolled up, sprayed on, flooded, painted on, etc.
  • D surface tension reducing additive
  • a pretreatment of the substrate surface is generally not necessary because the paint in question hangs everywhere on the surface and distributes it thereon.
  • the surface to be treated can be roughened, especially if conventional plastic surfaces are to be coated.
  • PC polycarbonate-based
  • PMMA polymethyl methacrylate
  • the coating composition produced according to the invention or the lacquer prepared by the process described can be finished by a further application of lacquer. It is conceivable to apply an additional scratch-resistant lacquer, anti-fogging lacquer, etc., in order to provide a stable surface against external influences.
  • the coating composition has a reversible change in hue.
  • the coating composition In the absence of UV irradiation, the coating composition is transparent and has a transmittance of about 88%.
  • the transmittance drops to values of less than 30% within seconds and on below 30% after one minute. Transmittances of less than 20% are observed after 15 minutes.
  • the desired absorption spectrum for the reversible color change can be adjusted.
  • the photochromic dyes (H) so that a suitable absorption in the wavelength range between 400 nm and 750 nm. That is, as soon as UV light strikes the lacquer according to the invention, its transmission in the relevant and relevant spectral range between 400 nm and 750 nm is reduced from originally close to 90% to less than 30% within seconds. As a result, a correspondingly coated substrate reacts directly to solar radiation with the desired change in transmission and discoloration. As soon as the UV radiation is removed, the original transmittance of about 80% and more is reached (again) in a few seconds.
  • the substrate may basically be any transparent material. It is not only the coating of plastics conceivable, as already described above. Also plastic films or even glass panes can be coated accordingly. It has also been found that even subsequent processing is possible. This applies, for example, for the coating of polycarbonate or PMMA, to which the paint in question can be applied without pretreatment. In addition, the required adhesion and scratch resistance is given without an additional coat of paint. This is true even if the plastic part coated in this way undergoes a subsequent deformation process or deformation in the context of, for example, a deep-drawing process. This circumstance can be attributed to a particularly successful adaptation of the paint according to the invention to the thermal expansion behavior or the expansion behavior of the thus coated plastic.
  • the switching speed of the photochromic dyes (H) embedded in the lacquer according to the invention does not deviate from the switching speed of the pigments in the untreated state in the sense of transparent / opaque or transparent virtually impermeable.
  • the lacquer according to the invention was applied as a coating composition in a layer thickness of about 50 ⁇ m to 100 ⁇ m onto polycarbonate as substrate or carrier material. Before the start of UV irradiation, the transmission was about 88%. The measurements were carried out at room temperature (about 23 ° C). The excitation light for the subsequent UV radiation impinges with a power of about 30 W / dm 2 on the thus designed sample.
  • transmittances of about 25% are observed after 1 min irradiation with the aforementioned excitation light of wavelength 280 nm. After 15 minutes of exposure, the transmission drops to about 18%. In further measurements it was found that the switching stability did not change even after a period of 2 years and also the absorption behavior remained essentially constant as described above.
  • the spectral absorption of the samples coated according to the invention was measured by means of a UV-Vis spectrophotometer (Lambda 850 from PerkinElmer Inc.) in a wavelength range from 280 to 780 nm.
  • a computer-controlled weathering chamber (Suntest XLS + from Atlas Material Testing Technology GmbH) was used.
  • the weathering filter equipped with a daylight filter was operated with light in a spectral band of 300 to 800 nm and an irradiance of 600 W / m 2 in a cyclic mode.
  • the cycle time was 4 minutes, the samples coated according to the invention first being irradiated for 2 minutes during one cycle and then the lamp being switched off for a period of 2 minutes.
  • the samples coated according to the invention were exposed to 20,000 weathering cycles of 4 minutes each.
  • the samples were taken out of the weathering chamber to record 5 absorbance spectra in the wavelength range of 280 to 780 nm with the UV-Vis spectrophotometer.
  • the recording of the 5 absorption spectra was carried out in each case at a time interval of 1 min, during which the sample was exposed to light in the wavelength range of 280 nm during the entire measurement period of 5 min was irradiated to 780 nm.
  • the maximum photochromic absorption in the visible wavelength range (380 to 780 nm) was achieved in less than 5 minutes for all samples.
  • the maximum photochromic absorption in the visible wavelength range measured after 1000, 2000, 3000, ... weathering cycles was compared with their initial value to determine a decrease to less than 50% of the initial value.
  • the samples coated with the lacquer according to the invention have a Z 5 o value of greater than 5000 or greater than 8000, preferably greater than 10,000, in particular greater than 15,000 and particularly preferably greater than 20,000.
  • lacquer according to the invention can be applied to the substrate by conventional coating techniques, practically all geometries of a surface to be coated can be mastered. As a result, completely new applications for sun protection or UV protection can be tapped.
  • the curing of the paint applied to the substrate takes place either by a so-called air drying over a period of for example 24 hours or by oven drying.
  • air drying over a period of for example 24 hours or by oven drying.
  • infrared radiation heater with the aid of which the lacquer already cures within a minute or less at a temperature of approximately 150 ° C.
  • the base materials used to prepare the paint or the realization of the coating composition are overall neither harmful to the environment nor toxic, so that a special environmental compatibility is given.

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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)
  • Paints Or Removers (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Abstract

L'invention a pour objet un procédé de production d'une composition de revêtement présentant une variation de teinte réversible et servant à conférer des propriétés d'absorption UV à des substrats, à base d'une peinture polymère. Selon ce procédé, on ajoute un liant (C) à base d'acrylate à un solvant (A, B), puis on ajoute un colorant photochromique (H) à la solution (A, B, C). La peinture ainsi produite est appliquée sur le substrat avant de durcir.
EP11741091A 2010-05-21 2011-05-20 Procédé de production d'une composition de revêtement présentant une variation de teinte réversible et servant à conférer des propriétés d'absorption uv à des substrats Withdrawn EP2571944A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102010022219A DE102010022219A1 (de) 2010-05-21 2010-05-21 Verfahren zur Herstellung einer Beschichtungszusammensetzung mit reversibler Farbtonänderung für die UV-Licht absorbierende Ausrüstung von Substraten
PCT/EP2011/002531 WO2011144354A1 (fr) 2010-05-21 2011-05-20 Procédé de production d'une composition de revêtement présentant une variation de teinte réversible et servant à conférer des propriétés d'absorption uv à des substrats

Publications (1)

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EP2571944A1 true EP2571944A1 (fr) 2013-03-27

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EP11741091A Withdrawn EP2571944A1 (fr) 2010-05-21 2011-05-20 Procédé de production d'une composition de revêtement présentant une variation de teinte réversible et servant à conférer des propriétés d'absorption uv à des substrats

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EP (1) EP2571944A1 (fr)
DE (1) DE102010022219A1 (fr)
WO (1) WO2011144354A1 (fr)

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CN110591468A (zh) * 2019-09-24 2019-12-20 立邦涂料(成都)有限公司 一种无机-有机复配光感变色水性氟碳清漆及其制备方法
US20220098146A1 (en) * 2020-09-29 2022-03-31 The United States Of America, As Represented By The Secretary Of Agriculture Reversible imine uv-absorbers
CN115785737B (zh) * 2022-12-22 2023-10-31 广州亦盛环保科技有限公司 一种光致变色喷墨光油

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DE19643773A1 (de) 1996-10-23 1998-04-30 Tschochner Rolfheinz UV-sensitive Farbstoffe
FR2795082B1 (fr) * 1999-06-01 2002-07-12 Essilor Int Procede d'impregnation d'un latex par un additif, latex obtenu et son application en optique
US6245711B1 (en) * 1999-10-29 2001-06-12 Ncr Corporation Thermal paper with security features
DE10025906A1 (de) * 2000-05-25 2001-12-06 Fraunhofer Ges Forschung Hybridpolymermaterial für photochrome Beschichtungen und damit beschichtete optische Gegenstände und Verglasungen
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WO2011144354A1 (fr) 2011-11-24

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