CN100581809C - Reflector-use precoat metal plate - Google Patents
Reflector-use precoat metal plate Download PDFInfo
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- CN100581809C CN100581809C CN200480004956A CN200480004956A CN100581809C CN 100581809 C CN100581809 C CN 100581809C CN 200480004956 A CN200480004956 A CN 200480004956A CN 200480004956 A CN200480004956 A CN 200480004956A CN 100581809 C CN100581809 C CN 100581809C
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Abstract
The present invention provides a precoated metal sheet for light reflectors having a high diffuse reflectance of visible lights and an excellent heat absorptivity, and also provides the electric or electronic apparatus using it. The precoated metal sheet comprises a metal sheet or plated metal sheet, a visible light reflective coat on one surface of the sheet, and a heat absorptive coat on the other surface of the sheet. The visible light reflective coat has a diffuse reflectance of visible rays of not less than 0.7 in a wavelength of 400 to 700 nanometers. The heat absorptive coat has a total emissivity of infrared rays of not less than 0.7 in the range of wave number of 600 to 3000 cm<-1> measured at a certain temperature within the range of from 80 to 200 degrees centigrade.
Description
Technical field
The present invention relates to a kind of precoating sheet metal as the reflective optical system material, and relate to the electricity or the electronic installation of plate that a kind of function and having with emission visual ray is used to reflect the visual ray of emission, for example lighting device, audio-visual apparatus, mobile computing device, plasma display and LCD TV.
Background technology
By the emission visual ray, lighting device, audio-visual apparatus, electronic installation, mobile computing device, LCD TV, plasma display etc. have functions such as the surrounding environment of illuminating, propagating optical signal, projection optics map.In these devices some have reflective optical system, and by using the reflector reverberation to improve the brightness of light or changing direction of light.Therefore, the quantity that reflects the time for fear of light in reflector descends, and the surface of reflector needs high visual ray reflectance factor.In the past, in order to improve the reflectance factor of reflector surface, for example, the polishing metal is with the formation minute surface, or coating has the white coating material of high reflectance.Nippon Steel Corporation's catalogue " View coat " discloses a kind of precoating steel disc that is coated with the adularescent coating material in advance that is used for the reflective optical system of lighting device.
The flat 10-000730 of the uncensored patent application No. of Japan discloses the splendid optical reflection film that a kind of conduct is used for the reflective optical system of LCD, comprise substrate film, be compressed on the thin metal film layer on the side of substrate film, with the resin bed that contains the fine inorganic particle that is compressed on the thin metal film layer, wherein the thin metal film layer is made of aluminum, and reflection index n
fAnd n
bSatisfy relational expression n
f-n
b＞=0.4, n wherein
fBe the reflection index of fine inorganic particle, and n
bIt is the reflection index of resin.The uncensored patent application No.2002-172735 of Japan discloses the metal decking that high diffuse reflection that a kind of usefulness acts on the reflecting plate of LCD backlight applies, comprise aluminum deck, the undercoating that on aluminum deck, forms, and on forming on the undercoating coating, wherein undercoating comprises the resin of 100 weight portions and the titanium oxide paint of 150 to 300 weight portions, and has the thickness of 50 to 100 μ m, comprise the resin of 100 weight portions and the titanium oxide paint of 100 to 250 weight portions and go up coating, and have and be not more than 15 glassy surface and the thickness of 10 to 30 μ m.Yet, will be used for lighting device before use and be used for the demand that the reflective optical system of the electric installation of LCD for example forms different shape, in recent years along with the complexity of the structure of electric installation and design in continuous increase.
Yet, when film as the flat 10-000730 of Japanese uncensored patent application No. in describe substrate the time, be difficult to will be in advance to form target shape with metal film layer or the film that contains the resin bed compacting of fine inorganic particle.Therefore, at the pressed metal thin layer or before containing the resin bed of fine inorganic particle, must in advance film be formed target shape.Yet, when reflective optical system complex-shaped, be difficult on the part of formation thickness compacting coating with unanimity.
On the other hand, according to the technology of describing among the uncensored patent application No.2002-172735 of Japan, after in advance undercoating and last coating being applied to aluminium sheet, the aluminium sheet that applies can be formed target shape.Yet when the amount of the titanium oxide that adds in reflectance coating was too high, coating can be insecure, and have the problem that crack or coating are peeled off occurs in reflectance coating when forming.And it also has a weakness, and the shape of Xing Chenging is restricted exactly, because do not have good shaping machinability as the aluminium of underlying metal.In addition, be difficult on public precoating line, to apply simultaneously the undercoating of thickness like this (50 to 100 μ m) with roll coater, and must apply two or more times, so have the weakness of poor efficiency.
Thereby, be difficult to that the reflective optical system of describing among Japan flat 10-000730 of uncensored patent application No. or the No.2002-172735 is applied to the reason that must adopt owing to the construction or design of electric installation and will form the electric installation of the reflective optical system of definite shape, and need employing in advance with the conventional precoating steel disc of the reflective optical system that is used for lighting device of whitewash coating.
On the other hand, in recent years, along with the computerization of electric installation, the thermogenetic problem of electric installation has appearred.In order to solve this heat problem, Japanese uncensored patent application No.2002-228085 discloses the thermal-radiating emissivity that is used for by making the internal layer coat film on the metal surface and has been not less than 70%, improves the technology of thermal radiation property.
Summary of the invention
To the continuous demand of above-mentioned electric installation is to become brighter or have identical brightness when using littler electrical power.Be to become brighter or when using littler electrical power, have identical brightness also to the continuous demand that must adopt the electric installation of the reflective optical system that forms certain shape.
The present invention aims to provide a kind of precoating sheet metal that is used for reflective optical system with visible light diffuse reflectance of raising, the precoating sheet metal that is used for reflective optical system that heat absorption is splendid, and the electricity or the electronic installation that use this precoating sheet metal.
As result of study, the inventor finds when applying the heat absorption coating on a surface of reflective optical system, and when having the splendid coating of visible reflectance on its another surface, the brightness meeting of illumination increases.
The present invention has also found following content:
When titanium oxide is added to the adhesive resin of fluorine resin, if the content of titanium oxide is too little, visual ray can pass coating so, the perhaps visual ray reflectivity step-down of coating, and this is because the gloss area at the interface between adhesive resin and the titanium oxide is too little.Along with the increase of titanium oxide content, the visual ray that passes coating reduces, and the increase of the gloss area at the interface between adhesive resin and the titanium oxide, and therefore, the visual ray reflectivity of coating improves.Yet, being higher than certain amount if find the content of titanium oxide, the volume of titanium oxide is much larger than the volume of adhesive resin so, and the interface between adhesive resin and the titanium oxide can reduce on the contrary, so the visual ray reflectivity descends.
The present invention is based on this knowledge realizes.
According to the present invention, provide following content:
(1) a kind of precoating sheet metal that is used for reflective optical system, comprise sheet metal or plating sheet, the visible light reflectance coating that on a surface of described sheet metal or plating sheet, provides, and the heat absorption coating that on another surface of described sheet metal or plating sheet, provides, wherein said visible light reflectance coating has in 400 to 700nm wave-length coverage and is not less than 0.7 visual ray diffuse reflectance, and described heat absorption coating have measure under a certain temperature in from 80 to 200 ℃ scope 600 to 3000cm
-1Wave-number range in be not less than total infrared-ray emissivity of 0.7.
(2) according to the precoating sheet metal that is used for reflective optical system of above-mentioned (1), wherein said visible light reflectance coating comprises adhesive and titanium oxide, is 100 weight portions based on the solids content of described adhesive, and the content of described titanium oxide is 40 to 250 weight portions
(3) according to the precoating sheet metal that is used for reflective optical system of above-mentioned (1) or (2), wherein the adhesive in described visible light reflectance coating comprises fluororesin.
(4) according to any one the precoating sheet metal that is used for reflective optical system in above-mentioned (1) to (3), wherein said heat absorption coating comprises adhesive and heat absorption paint, solids content based on described adhesive is 100 weight portions, and the content of described heat absorption paint is 10 to 150 weight portions.
(5) according to the precoating sheet metal that is used for reflective optical system of above-mentioned (4), wherein said heat absorption paint is a carbon.
(6) according to the precoating sheet metal that is used for reflective optical system of above-mentioned (4) or (5), wherein said heat absorption coating also comprises conductive metal powder, is 100 weight portions based on the solids content of described adhesive, and the content of described conductive metal powder is 1 to 50 weight portion.
(7) according to any one the precoating sheet metal that is used for reflective optical system in above-mentioned (1) to (6), the surface roughness Ra of wherein said sheet metal or plating sheet is 0.05 to 1.8 μ m.
(8) according to any one the precoating sheet metal that is used for reflective optical system in above-mentioned (1) to (7), wherein said sheet metal or plating sheet be steel disc or steel plating sheet preferably.
(9) a kind of electric installation or electronic installation comprise according to any one the precoating sheet metal that is used for reflective optical system in above-mentioned (1) to (8).
Description of drawings
Fig. 1 is a schematic sectional view, shows an embodiment according to precoating sheet metal of the present invention;
Fig. 2 is the sketch that is used to measure the device of illumination.
The specific embodiment
As the light of the fluorescent lamp of lighting device or bulb with as the light of optical signal etc. all is visual ray.Therefore, if further improve the diffuse reflectance of the lip-deep visual ray of reflective optical system, light will become bright on the whole.The diffuse reflectance of visual ray can change with the material on reflective optical system surface.Conducts such as known aluminium, silver, titanium oxide, barium sulfate, zinc oxide have the material of the high diffuse reflectance of visual ray.Therefore, now by using this technology manufacturing to have the reflective optical system of high reflectance, and think and be difficult to improve reflectance factor.
On the other hand, lighting device and optical signal launcher are in the warm of radiative while also emitting infrared radiation.In addition, these device great majority have been equipped the electronic building brick that is used to control brightness and other parts, and these electronic building bricks produce heat.
The inventor finds that when using the precoating sheet metal conduct that applies the heat absorption coating applying the high visible reflectance coating on the side on opposite side to be used for the reflective optical system of lighting device or optical signal launcher, it is brighter that illumination or optical signal can become.Though the details of this reason is unknown, look like, because may be absorbed by the heat absorption coating from the heat (infra-red radiation) of lighting device or optical signal launcher generation, in order to compensate, illuminator works, and the quantity of visible light also increased, so it has brightened.And, except these phenomenons, when heat is absorbed by the heat absorption coating by precoating sheet metal of the present invention, the temperature of precoating sheet metal rises, the temperature of visible light reflectance coating also rises, the reflection index step-down of the adhesive resin in the visible light reflectance coating, interpolation become big as the paint of titanium oxide and the reflection index difference between the adhesive resin, the visual ray reflectance factor of visible light reflectance coating improves, and the light of lighting device or optical signal becomes brighter.
In addition, think that also one of reason that brightness improves is that the heat that device is launched is absorbed by the heat absorption coating, the temperature in the device descends, and the electronic circuit of the control panel in the device etc. is worked effectively, the current loss that spends in the light emission reduces, and the quantity of light increases.Fig. 1 shows an embodiment of the splendid precoating sheet metal of the heat absorption that is used for reflective optical system according to the present invention.Sheet metal 1, the visible light reflectance coating 2 that provides on a surface of sheet metal 1 are provided for it, and the heat absorption coating 3 that provides on another surface of sheet metal 1.
The visible light reflectance coating of precoating sheet metal of the present invention must have in 400 to 700nm wavelength and is not less than 0.7 visual ray diffuse reflectance.Visual ray diffuse reflectance less than 0.7 is unaccommodated, because it does not improve the reflection function of visible light, and has reduced the light from lighting device or illuminator.Preferably the diffuse reflectance at the visual ray of 555nm is not less than 0.8.This is because the wave-length coverage that influences brightness known to usually in the visual ray wave-length coverage especially is to 555nm from 550.In the present invention, diffuse reflectance is the description of spectrum reflectance factor factor among the JIS Z 8722.2 (2), and also is known as spectral reflectance factor.It can be measured according to JIS Z 8722.4.The increase of the diffuse reflectance of visible light reflectance coating obtains by add visible light reflection paint in coating.
Can use known paint to reflect paint as visible light, their example comprises aluminium, silver, titanium oxide, barium sulfate, zinc oxide etc.In the middle of them, preferred titanium oxide when in coating, adding.Because the reflection index height of titanium oxide, so when adding titanium oxide in coating, it is higher that diffuse effect becomes.
Solids content based on the adhesive in the coating is 100 weight portions, and the content of titanium oxide is preferably 40 to 250 weight portions.Not preferably less than the titanium oxide content of 40 weight portions, because can not improve the visible light reflection function like this.Also not preferably more than the titanium oxide content of 250 weight portions, because can have the thickening or the defective of gelling of coating material of coating for example like this.Being more preferably titanium oxide content is 65 to 150 weight portions.Yet, necessary suitably selective oxidation Ti content, because the proportion of resin can change with the type of adhesive resin, and the scope of the optimum content of titanium oxide also can take place a bit to change.
Can use known titanium oxide as use among the present invention titanium oxide.The example of titanium oxide comprises Ishihara Sangyo the Kaisha, " TIPAQUE of Ltd.
TM" and " TITANIX of Tayca Corp.
TM".Yet, in known titanium oxide, have rutile type and anatase type, and preferred rutile type is used for the present invention.The anatase type has the possibility of the adhesive of branch electrolytic coating, because it has the photocatalysis bigger than rutile type.Can use Al, Si, Zr, organic substance etc. to handle titania surface, be used to reduce photocatalysis, improve the paint dispersiveness, or improve the corrosion resistance of paint.
As for the thickness of visible light reflectance coating, preferred thicker thickness, because it will improve the visible light reflectance factor, but not preferred too thick coating, because it can reduce the coating machinability.Because optimum thickness also can change with the type of coating material adhesive, usually can appointed thickness, but thickness still is preferred 10 to 50 μ m.
Measure under a certain temperature in from 80 to 200 ℃ scope, 600 to 3,000cm
-1The total emissivity of the heat absorption coating in the wave-number range is not less than 0.70.Because have less than 600cm
-1Or greater than 3,000cm
-1The ray of wave number has very little influence to heat, and the emissivity that comprises the ray with wave number like this is unsuitable.And, when total emissivity less than 0.7 the time, the heat absorption function can descend.
Hereinafter, general knowledge about heat absorption has been described.As everyone knows, heat is the part from the electromagnetic radiation of object emission, and when the heat radiation ray enters object, the reflection of their part, a part is propagated, and remainder is absorbed.For example, with reference to Nishikawa and Fujita by Rikogakusha Publishing Co., " the Mechanical-engineering basiclecture that Ltd. publishes; Electrothermics ".When the heat radiation ray entered sheet metal, because the heat radiation ray is not almost propagated by sheet metal, the heat radiation ray not only reflected but also be absorbed.When the heat radiation ray from lighting device or optical signal launcher generation enters the reflective optical system surface, if most heat radiation ray reflections of incident from the teeth outwards, Zhuan Zhi temperature will rise so, and on the other hand, if most heat radiation rays are absorbed on the reflective optical system surface, Zhuan Zhi temperature will descend so.
The method for reflection that uses infrared spectrophotometer is the method for the reflectance factor of the well-known heat radiation ray that incides surface such as sheet metal as detection.Yet when measuring reflectance factor by this method, if the lip-deep degree of roughness of sheet metal is coarse, therefore the heat radiation ray of incident, is difficult to obtain high-precision absorption coefficient with diffuse reflection so.According to about thermal-radiating Kirchhoff's law, under constant temperature, the absorptivity of object is identical with emissivity.For example, with reference to Nishikawa and Fujita by Rikogakusha Publishing Co., " the Mechanical-engineering basic lecture that Ltd. publishes; Electrothermics ".
In addition, the inventor finds, is 100 weight portions based on the solids content of the adhesive in the coating, and preferred heat absorption coating comprises the heat absorption paint of 10 to 150 weight portions, to improve the emissivity of heat absorption coating.The heat absorption that preferably is not less than 10 weight portions is coated with agent content, because emissivity is tending towards becoming less than 0.7.Preferably be not coated with agent content, because the storage stability of the coating material of coating can variation more than the heat absorption of 150 weight portions yet.
Can use known heat absorption paint as the heat absorption paint, their example comprises nigrosine, polymethylene dyestuff, trisazo dyes amine salt, cyanine dye or its metal composite, anthraquinonyl paint, phthalein cyanines base paint, iron oxide, charcoal etc.In these known heat absorption paints, preferred carbon is because its radiated infrared ray in than the wave-number range of broad.
Can use known carbon as carbon black, charcoal, graphite as this carbon.The mixture of the carbon (being called " macroparticle size carbon " hereinafter) that the carbon that adds is preferably the carbon (being called " small particle size carbon " hereinafter) that has less than the particle size of 0.1 μ m and has the particle size from 0.1 (comprising) to 30 (not comprising) μ m.Binding agent based solids content is 100 weight portions, the content of small particle size carbon is from 1 to 20 weight portion preferably, and preferred from 1 to 140 weight portion of the content of macroparticle size carbon, and the total content of small particle size carbon and macroparticle size carbon is preferably 10 to 150 weight portions.Though the smallest particles size of small particle size carbon without limits, preferred its maximum particle size is not less than 0.1 μ m, because be tending towards forming the space between the carbon particle, and it is difficult to as small particle size carbon.The content of preferred small particle size carbon is not less than 1 weight portion, because have the possibility that makes the opaque bad effect of sheet metal and reduce thermal absorptivity.Also preferred its content is more than 20 weight portions, because have that the viscosity of applying liquid can uprise or possibility that applying liquid in time can gelling.Preferred macroparticle size carbon has the particle size less than 0.1 μ m, because it can not be as macroparticle size carbon, but works in the mode identical with small particle size carbon.Not preferred macroparticle size carbon has the particle size that is not less than 30 μ m, because have the possibility that applicability descends or the pattern of coating degenerates after applying when applying the applying liquid that comprises carbon.The content of preferred macroparticle size carbon is not less than 1 weight portion, because have the possibility that thermal absorptivity can reduce.Also not preferred its content is more than 140 weight portions, because have the possibility that coating can die down and the coating machinability can reduce.In addition, the total content of not preferred small particle size carbon and macroparticle size carbon is less than 10 weight portions, because have the possibility that reduces heat absorption.Also preferred total content is more than 150 weight portions, because have that coating dies down and the possibility that reduces of the formability of coating then, or has that applying liquid thickens and apply the possibility that machinability reduces then.
Though the thickness of heat absorption coating is unrestricted, preferably be not less than 1 μ m.The thickness of preferred heat absorption coating is not less than 1 μ m, because thermal absorptivity may reduce.Though its maximum ga(u)ge is unrestricted, too big thickness is tending towards causing as applying the pattern of uneven difference.Be necessary suitably to select thickness when therefore, needing.Usually, preferred thickness is less than 100 μ m.
Outside the heat extraction absorbability paint, binding agent based solids content is 100 weight portions, and the heat absorption coating preferably includes the conductive metal powder of from 1 to 50 weight portion, as conducting electricity paint so that precoating sheet metal conduction.Preferred heat absorption coating is conducted electricity, because reflective optical system can be guaranteed ground connection, is difficult in and produces static in the reflective optical system, and therefore be difficult to the absorption dust.The content of preferable alloy powder is not less than 1 weight portion, because the electrical conductivity that obtains is little.Also not preferred its content is more than 50 weight portions, because the formability of coating is tending towards descending.The example of the conductive metal powder that uses includes but not limited to aluminium, nickel, stainless steel, copper, silver, magnesium, zinc, tin.The shape of metal powder is unrestricted, but needs suitably to select, because the degree of electrical conductivity can be along with change of shape, and some shape can influence thermal absorptivity.With regard to known to the inventor, be more preferably the bond of sheet metal and chain metal.Preferred use chain metal is because the area of the reverberation in the coating diminishes and is difficult to prevent heat absorption.Yet, preferably chain metal and sheet metal are combined, because have the possibility that electrical conductivity reduces when only using the chain metal.The weight ratio of sheet metal and chain metal is preferably in the scope between 0.1/1 and 6/1, because thermal absorptivity and thermal conductivity are splendid.Because sheet metal has the large tracts of land of reverberation in coating, so have the possibility of the heat absorption of preventing.Therefore, when the weight ratio of sheet metal and chain metal less than 0.1/1 the time, electrical conductivity reduces.When ratio greater than 6/1 the time, have the possibility that thermal absorptivity reduces.In various metals, preferred nickel is because it compares the heat absorption that hinders the heat absorption paint hardly with other metal.
The adhesive of forming visible light reflectance coating or heat absorption coating can be a resin, or is used for the inorganic coating that forms by sol gel process, the known application of adhesive of the inorganic and organic synthesis coating that forms by sol gel process etc.The preferred resin that uses this kind form is as coating material, because the method that it is handled easily and coating forms is simple.Can use known resin as this resin, their example comprises mylar, polyurethane resin, acrylic resin, epoxy resin, melamine resin, vinyl chloride resin, fluororesin etc.This resin both can be thermoplastic, also can be heat cured.Some types of these resins can be used when needed together.In these resins, be hard-core with any resin, must select rightly when still needing, because the performance as machinability, adhesiveness, hardness of coating can be with type, molecular weight or the glass transformation temperature (T of resin
g) and change.When using the resin that solidifies by crosslinking agent, the performance as machinability, adhesiveness, hardness of coating can be with type and its addition of crosslinking agent, and the type of the catalyst that uses in cross-linking reaction changes with its addition, these are hard-core, but will select rightly when needed.Resin can be the emulsion of solid, water miscible or aqueous dispersion.When using hard resin, can be dissolved in the organic solvent, or pulverize in advance with its heat fusing.Also can use ultraviolet (UV) curable resin and electron beam (EB) curable resin.Any of these resins can be commercial obtainable a kind of.
According to the knowledge that the inventor has obtained till now, be preferably based on the curable polyester binder of the melamine of solvent, based on the acrylic emulsion adhesive of curable polyester binder of the isocyanates of solvent and aqueous dispersion as adhesive.The example of especially preferred adhesive is including, but not limited to hereinafter described.
For based on the curable polyester binder of the melamine of solvent, the mean molecule quantity of mylar preferably from 2000 to 30,000, the T of mylar
gPreferably from-10 to 70 degrees centigrade, and be 100 weight portions based on mylar, the addition of melmac is from 5 to 70 weight portions preferably.The molecular weight of preferred polyester resin is not less than 2000, because the machinability of coating can descend.Also not preferred molecular weight greater than 30,000, because the viscosity of the solution of dissolving resin can be too high in solvent.The T of preferred polyester resin not
gBe lower than-10 degrees centigrade, because can not form coating.Also not preferred T
gGreater than 70 degrees centigrade because coating can be too hard and machinability can descend.Based on mylar is 100 weight portions, and the addition of preferred melamine is not less than 5 weight portions, because coating can not solidified.Also preferred addition is more than 70 weight portions because coating can be too hard and also machinability can descend.The mylar that uses can be commercial obtainable a kind of, and their example comprises Toyobo Co., " the VYLON of Ltd.
TM" and Sumitomo Bayer Urethane Co., " the Desmophen of Ltd.
TM".The melmac that uses also can be commercial obtainable a kind of, and their example comprises MitsuiCytec, " the CYMEL of Ltd.
TM" and " MYCOAT
TM", and Dainippon Ink﹠amp; " the BECKHAMIN of Chemicals Inc.
TM" and " SUPERBECKHAMIN
TM".
For based on the curable polyester binder of the isocyanates of solvent, the mean molecule quantity of mylar preferably from 2000 to 30,000, the T of mylar
gPreferably from-10 to 70 degrees centigrade, and the addition of preferred isocyanate so that [in the NCO group of the isocyanates of equivalent]/value from 0.8 to 1.2 of [in the OH group of the mylar of equivalent].When the value of [in the NCO group of the isocyanates of equivalent]/[in the OH group of the mylar of equivalent] less than 0.8 or greater than 1.2 the time, coating can be tending towards not solidifying when forming.The molecular weight of preferred polyester resin is not less than 2000, because the machinability of coating can descend.Also not preferred molecular weight greater than 30,000, because the viscosity of the solution of dissolving resin can be too high in solvent.The T of preferred polyester resin not
gBe lower than-10 degrees centigrade, because can not form coating.The also T of preferred polyester resin not
gGreater than 70 degrees centigrade because coating can be too hard and machinability can descend.The mylar that uses can be commercial obtainable a kind of, and their example comprises Toyobo Co., " the VYLON of Ltd.
TM" and Sumitomo Bayer Urethane Co., " the Desmophen of Ltd.
TM".The isocyanates that uses also can be commercial obtainable a kind of, and their example comprises Sumitomo Bayer Urethane the Co., " Sumidur of Ltd.
TM" and " Desmodur
TM", and " the Takenate of Mitsui Takeda Chemicals Inc.
TM".
The acrylic emulsion adhesive of the aqueous dispersion of using also can be known a kind of or commercial obtainable a kind of.When using the acrylic emulsion adhesive of aqueous dispersion, can add known high-adhesiveness resin to adhesive as epoxy resin.If desired, can select the type and the content of epoxy resin rightly, because they are influential to the performance of coating.Be more preferably resin based on water as the acrylic resin of aqueous dispersion, because the coating machinability can be high, do not discharge the problem of volatile organic solvent in the atmosphere, and need in being coated with machine, not build blast pipe and the burner that is used for volatile organic solvent.
When the visible light reflection paint that adds in the visible light reflectance coating at precoating sheet metal according to the present invention was titanium oxide, the adhesive resin in the visible light reflectance coating preferably included fluororesin, because can improve reflectivity like this.Because fluororesin has than the lower reflection index of any other known resin, so when fluororesin and titanium oxide with high reflective index in conjunction with the time, reflection index difference between adhesive resin and the titanium oxide paint is just big, and easier reflection on the interface of light between them.
The fluororesin that uses can be known a kind of, for example trifluoro-ethylene resin, TFE and vinylidene fluoride resin etc.This resin can be homopolymers or the copolymer with another kind of resin monomer.Can with the fluororesin of another kind of mixed with resin adhesive resin as fluorine resin.Yet the coating with high fluorine concentration is preferred.Be more preferably and use the trifluoro-ethylene resin, because the fluorine concentration height in coating, and prepare coating material easily.In the present invention, the trifluoro-ethylene resin is defined as and comprises having repetitive-CF
2The polymeric resin of-CFX-, wherein X is the hydrogen or halogen beyond the fluorine.The example of trifluoro-ethylene resin comprises poly-(chlorotrifluoroethylene).The adhesive resin of fluorine resin can be commercial obtainable coated with resins based on fluorine, and their example comprises the " Kynar of the foraflon of ATOFINAChemicals Inc.
TM" series, and Asahi GlassCo., " the LUMIFLON of the trifluoro-ethylene resin of Ltd. and the copolymer of another kind of resin
TM" series.When using foraflon, before using, usually it is mixed with acrylic resin.If desired, by known crosslinking agent as isocyanates or melmac, can crosslinked these resins.The isocyanates that uses can be commercial obtainable a kind of, and their example comprises Sumitomo Bayer Urethane the Co., " Sumidur of Ltd.
TM" and " Desmodur
TM", and " the Takenate of Mitsui Takeda Chemicals Inc.
TM".The melmac that uses can be commercial obtainable a kind of, and their example comprises Mitsui Cytec, " the Cymel of Ltd.
TM" and " MYCOAT
TM", and Dainipon Ink﹠amp; Chemicals, " the BECKHAMIN of Inc.
TM" and " SUPERBECKHAMIN
TM".There is no need to use crosslinking agent.Based on the total resin that comprises fluororesin is 100 weight portions, no more than 20 weight portions of amount of the preferred crosslinking agent that adds, because the fluorine concentration in the coating can be higher, and the diffuse reflectance of visible light also can improve.Be more preferably and use the trifluoro-ethylene resin with the hydroxyl value that is not more than 10mg-KOH/g, and be 100 weight portions based on the total resin that comprises fluororesin, no more than 20 weight portions of the amount of the crosslinking agent of interpolation are because the diffuse reflectance of visual ray can improve.This be because, when hydroxyl value was not more than 10mg-KOH/g, coating was crosslinked by a spot of crosslinking agent, even or do not use crosslinking agent can form coating yet, and the fluorine concentration in the coating uprises.
Visible light reflectance coating or heat absorption coating except titanium oxide, heat absorption paint and conduction paint, if desired, can also comprise colored paint, corrosion preventive pigment or antirust agent.Yet, when attempting to improve the visible light reflectance factor of visible light reflectance coating, more preferably include only the coating of adhesive resin and titanium oxide, because can improve the diffuse reflectance of visible light like this.If in the visible light reflectance coating, add the paint beyond the titanium oxide, the interface that will between the paint beyond adhesive resin and the titanium oxide, little reflection index difference occur having, and the visible light diffuse reflectance of coating can descend.Yet,, if desired, can add the paint beyond the titanium oxide to the visible light reflectance coating from the position of pattern or erosion protection.
Use known inorganic or organic colored paint as this colour paint.The example of inorganic color paint comprises zinc oxide (ZnO), zirconia (ZrO
2), calcium carbonate (CaCO
3), barium sulfate (BaSO
4), aluminium oxide (Al
2O
3), kaolin and iron oxide (Fe
2O
3, Fe
3O
4).
The example of corrosion preventive pigment or antirust agent comprises the known corrosion preventive pigment that contains chromium as strontium chromate and calcium chromate, and known Chrome-free corrosion preventive pigment or antirust agent such as trbasic zinc phosphate, zinc phosphite, aluminum phosphate, aluminium phosphite, molybdate, phosphoric acid/molybdate, vanadate/phosphate mixing paint, silica and be called the silica of the absorption calcium of calcium silicates.When the underlying metal of precoating sheet metal is erodible metal as steel disc or steel plating sheet, preferably add corrosion preventive pigment or antirust agent, to improve the corrosion resistance of precoating sheet metal.If consider environmental problem in recent years, Chrome-free corrosion preventive pigment or antirust agent are more effective.As Chrome-free corrosion preventive pigment or antirust agent, both can use reagent, also can use commercial obtainable a kind of.The example of commercial obtainable corrosion preventive pigment comprises Toho Ganryo Co., the corrosion preventive pigment " EXPERT based on trbasic zinc phosphate of Ltd.
TM-NP500 " and " EXPERT
TM-NP530 ", TohoGanryo Co., the corrosion preventive pigment " EXPERT of Ltd. based on zinc phosphite
TM-NP1500 ", " EXPERT
TM-NP1530 ", " EXPERT
TM-NP1600 " and " EXPERT
TM-NP1700 "; the aluminium triphosphate of Tayca Corporation " K-WHITE " series; Sherwin-Williams Company based on the paint of molybdate or based on molybdate/phosphatic paint " SHER-WHITE " series; Nippon Aerosil Co.; Ltd. or DegussaJapan Co., Ltd. smokes silica " AEROSIL
TM" series, Nissan ChemicalIndustries, the gluey silica " SNOWTEX of Ltd.
TM" series, the silica " SHIELDEX of the absorption calcium ion of GRACE
TM" series etc.Can be used in combination in these corrosion preventive pigments two or more.In these Chrome-free corrosion preventive pigments, the silica of preferred independent absorption calcium ion or the silica that absorbs calcium ion with based on the combining of phosphatic corrosion preventive pigment splendid because the corrosion resistance of precoating sheet metal and pressure formability are understood.More preferably absorb the silica of calcium ion and combining of aluminium triphosphate.
Be necessary suitably to select on demand type, addition and the particle size of these colored paints, corrosion preventive pigment or antirust agent, because can change with them such as the coating performance of emissivity, machinability, pattern and corrosion resistance.
If desired, can will add the heat absorption coating to as known additives such as levelling agent, paint dispersant, paraffin, matting agents.Yet the visible light reflectance coating does not preferably comprise this kind additive, because this kind additive can reduce the diffuse reflectance of visible light.Yet,, also this kind additive can be added to the visible light reflectance coating if coating machinability or coating performance need.The type or the content of additive are unrestricted, and can suitably select on demand.Especially, paraffin is aspect the formability that improves the precoating sheet metal and prevent that the heat absorption coating from breaking etc. the aspect is effective.
According to the application of the precoating sheet metal that is used for reflective optical system of the present invention, the low visible light regular reflection coefficient of preferred light reflector sometimes.If the regular reflection coefficient height of reflective optical system, Fan She light can diffusion and have only specific part to brighten so, and perhaps the reflection of light source such as bulb and fluorescent lamp will be in the reflection of reflective optical system surface.For example, in the reflective optical system of LCD TV, unless light by diffuse reflection more uniformly and be transferred to LCD, otherwise just has the bright and dark possibility that brightness occurs in the reflection of LCD.The reflective optical system that is used for this kind application needs low visible light regular reflection coefficient sometimes.As everyone knows, the regular reflection coefficient of visible light and the surface gloss negative correlation of visible light reflectance coating, promptly glossiness is low more, and it is low more that the regular reflection coefficient just becomes.Therefore, a kind of method for optimizing that reduces the visible light regular reflection coefficient of visible light reflectance coating is to add matting agent to the visible light reflectance coating.The matting agent that uses can be known matting agent, and silica or be effective based on the paint of silica.In paint, preferably absorb the silica of metal ion, because it also can improve corrosion resistance based on silica.Can use known silica as the silica that is used for matting agent.Its example comprises Nippon Aerosil Co., Ltd. or Degussa Japan Co., and Ltd. smokes silica " AEROSIL
TM" series, Nissan Chemical Industries, the gluey silica " SNOWTEX of Ltd.
TM" series etc.Can use the silica " SHIELDEX of the absorption calcium ion of GRACE
TM" serial as the silica that absorbs metal ion.Yet unless require low visible light regular reflection coefficient or low-luster, preferred visible light reflectance coating does not comprise matting agent etc., and includes only adhesive resin and titanium oxide, because diffuse reflectance can be higher when comprising matting agent like this.
In order on the surface of sheet metal, to form visible light reflectance coating and heat absorption coating, can be with the form coated metal lamina of the coating composition that comprises adhesive by known coating material.The example of this form comprises the wherein coating material based on solvent of dissolving resin in solvent, the water coating material of dispersion and emulsion resin in water etc. wherein, by the powder coating material that resin ground is become powder obtain, the starch coating material of dispersion grinding resin in water etc. wherein, the curable coating material of ultraviolet (UV), the curable coating material of electron beam (EB), wherein resin-shaped is become membranaceous and with the film lamination of film-stack, and wherein the resin fusing that is melted and applies applies.The example of the painting method that adopts includes but not limited to roller coat, roller curtain coating, pouring curtain coating, aerial spraying, airless spraying, brushing, coating die is coated with and other known painting method.In the middle of them, preferred roller coat, roller curtain coating, drench curtain coating and coating die is coated with because be treated as continuously may and also production efficiency be improved.
For antirust or shelter rust, can below visible light reflectance coating or heat absorption coating, provide primary coat.Known adhesive, corrosion preventive pigment and colored paint can be used for primary coat.Commercial obtainable coating material can be used for primary coat.Can use adhesive, corrosion preventive pigment and the colored paint identical with the aforementioned paint that is used for visible light reflectance coating or heat absorption coating.Binding agent based solids content is 100 weight portions, and the primary coat below the visible light reflectance coating preferably includes the visible light reflection paint of 40 to 250 weight portions, and preferred titanium oxide is because can improve the diffuse reflectance of visible light reflectance coating like this.The thickness of primary coat is preferred but be not limited to from 1 to 40 μ m.When this thickness during, have primary coat and can not play the part of and for example shelter or the role's of corrosion resistance possibility less than 1 μ m.When this thickness during, have and apply the possibility that machinability descends greater than 40 μ m.Be used for the identical adhesive resin of visible light reflectance coating or heat absorption coating with those and can be used for primary coat.In addition, if desired, can add to primary coat such as for example known additive of colored paint, corrosion preventive pigment, levelling agent, paint dispersant, paraffin, matting agent etc., and add visible light reflectance coating or heat absorption coating to.Specifically, preferably add corrosion preventive pigment to primary coat, because can improve the corrosion resistance of precoating sheet metal like this.The preferred Chrome-free corrosion preventive pigment that uses.In the Chrome-free corrosion preventive pigment, the silica of preferred independent absorption calcium ion or the silica that absorbs calcium ion with based on the combining of phosphatic corrosion preventive pigment, because the corrosion resistance and the pressure formability of such precoating sheet metal are splendid.Be more preferably the silica of absorption calcium ion and the combination of aluminium triphosphate.When below the visible light reflectance coating, providing primary coat,, preferably in primary coat, add matting agent in order to reduce the visible light regular reflection coefficient of visible light reflectance coating.Can use known matting agent as the matting agent in the initiation layer, and be well-known based on matting agent of silica etc.
In addition, in order to increase the coating adhesiveness, preferred metal pretreated surface before applying visible light reflectance coating or heat absorption coating.The pretreated example of this kind comprises that chromate coating processing, electrolytic chromate are handled, trbasic zinc phosphate is handled, based on zirconic processing, based on processing and other known processing of titanium oxide.Preferably in the non-chromate preliminary treatment of the organic compound of developed in recent years use such as resin, because can reduce the load of environment like this.Use comprises processing and other the known processing of describing among the flat 09-828291 of Japanese uncensored patent application No., the flat 10-251509 of No., the flat 10-337530 of No., No.2000-17466, No.2000-248385, No.2000-273659, No.2000-282252, No.2000-265282, No.2000-167482 or the No.2002-266081 as the pretreated example of non-chromate of the organic compound of resin.Can use commercial obtainable chromate to handle.If desired, need suitably select pretreated type and coat weight, because the corrosion resistance of the adhesiveness of heat absorption coating and precoating sheet metal changes with type or coat weight consumingly.
Can use the underlying metal of material known conduct according to the sheet metal of precoating sheet metal of the present invention.Underlying metal can be an alloy.The example of sheet metal comprises steel disc, aluminium flake, titanium sheet, copper sheet etc.Alloy for example, with zinc, aluminium, copper or nickel, also can be used in surface that can the plated metal sheet.The example that is used as the steel disc of sheet metal comprises cold rolling steel disc, hot-rolled steel sheet, hot dipping zinc coating steel disc, electrogalvanizing steel disc, alloy for hot-dip steel disc, the steel disc of aluminizing, plate golding aluminium zinc alloy steel disc, stainless steel substrates, and other known steel disc or steel plating sheet.
Preferred 0.5 to the 1.8 μ m of the surface roughness Ra of sheet metal or plating sheet is because can improve diffuse reflectance like this.When visual ray enters visible light reflectance coating surperficial, pass on the surface of the underlying metal sheet of visual ray below coating of reflection of visible light reflectance coating and be reflected.The inventor finds, when the surface roughness of underlying metal sheet during much smaller than the visual ray wavelength (wavelength region may of visual ray normally 380 to 780nm), is incident on the lip-deep visual ray of underlying metal and is difficult to by diffuse reflection, and be easy to by regular reflection.On the other hand, when the surface roughness of underlying metal sheet during, be incident on the lip-deep visual ray of underlying metal and enter space between the lip-deep uneven part of underlying metal, and be easy to be absorbed by underlying metal much larger than the visual ray wavelength.Therefore, not preferably as the surface roughness Ra of the sheet metal of underlying metal or plating sheet less than 0.05 μ m, because can be difficult to the diffuse reflection visual ray.Also not preferred Ra is greater than 1.8 μ m, because passing the visible light reflectance coating and arriving as the sheet metal of underlying metal or the visual ray of plating sheet of reflection is easy to be absorbed by the underlying metal surface.
Before the preliminary treatment, sheet metal can stand the processing of some routines, for example hot water rinsing, alkaline degreasing and acid soak before implementing coating.Preferred steel disc or the steel plating sheet of using is as sheet metal, because can improve the formation machinability of precoating sheet metal like this.
If produce reflector by forming precoating sheet metal of the present invention, can improve reflector production efficiency.Can produce reflector by known formation method, that their example comprises is die-cut, crooked, punch forming (deep drawing), stretch forming (stretch forming), press forming (rollforming) and other formation method.
In the electricity or electronic installation that comprise according to precoating sheet metal of the present invention, because the precoating sheet metal has high visual ray diffuse reflectance and splendid thermal absorptivity, the light of lighting device or optical signal becomes brighter, and the temperature in the device descends, and therefore, the electronic circuit of the control panel that provides in the device etc. can effectively and stably be worked.The example of electricity or electronic installation comprises lighting device, audio-visual apparatus, mobile computing device, plasma display, LCD TV.
Example
To explain the method for heat absorption coating material that preparation is used in test and visible light reflection coating material below in detail.
At Solvesso by 50 weight %
TMThe commercial obtainable Toyobo Co. of dissolving in the organic solvent that the cyclohexanone of 150 and 50 weight % is formed, Ltd. has 13,000 mean molecule quantity and a T of 20 ℃
gThe solvable amorphous polyester resin " VYLON of organic solvent
TMGK140 " (hereinafter being called mylar).
Subsequently, be 100 weight portions based on the solids content of mylar, with the commercial obtainable Mitsui Cytec of 15 weight portions, the HMMM " CYMEL of Ltd.
TM303 " and the commercial obtainable Mitsui Cytec of 0.5 weight portion, the acid catalyst " Catalyst of Ltd.
TM6003B " add the mylar that dissolves in the organic solvent to.Stir the gained mixture to obtain the curable cleaning coating material based on polyester of melamine, this material is called the coating material based on polyester/melamine hereinafter.
In order to detect the effect of resin, under value 1.0 [in the NCO group of the isocyanates of equivalent]/[in the OH group of the mylar of equivalent], mix above-mentioned mylar that dissolves in organic solvent and commercial obtainable Sumitomo Bayer Urethane Co., Ltd. stops isocyanates " Sumidur based on HDI (hexamethylene vulcabond)
TMBL3175 "; and the solids content of adding based on resin is the Mitsui Takeda Chemicals of 0.05 weight portion of 100 weight portions; the catalysts of Inc. " TK-1 "; to obtain the curable cleaning coating material based on polyester of isocyanates, this material is called the coating material based on polyester/isocyanates hereinafter.
In order further to detect the effect of resin, under value 1.0 [in the NCO group of the isocyanates of equivalent]/[in the OH group of the mylar of equivalent], mix commercial obtainable Asahi GlassCo., Ltd. has 12,000 mean molecule quantity and a T of 20 ℃
gTrifluoro-ethylene resin " LUMIFLON
TMLF552 " with commercial obtainable Sumitomo Bayer Urethane Co., Ltd. stops isocyanates " Sumidur based on HDI (hexamethylene vulcabond)
TMBL3175 "; and the solids content of adding based on resin is the Mitsui TakedaChemicals of 0.05 weight portion of 100 weight portions; the catalysts of Inc. " TK-1 ", to obtain the cleaning coating material based on fluorine, this material is called the coating material based on fluorine hereinafter.
Next, add various paints the cleaning coating material of acquisition to, with the reflection of preparation visible light coating material, heat absorption coating material and initial application material.
The details of the coating material of preparation will be described below.
[visible light reflection coating material]
With Ishihara Sangyo Kaisha, the titanium oxide of Ltd. " TIPAQUE CR95 " adds the cleaning coating material to and stirs, to obtain to be called for short sometimes the visible light reflection coating material of making " reflection coating material ".Table 1 shows the type of cleaning coating material of use and the details of titanium oxide content.Titanium oxide content is that titania weight parts of 100 weight portions is represented by the resin solid content based on the cleaning coating material in table 1.
Table 1
| Coating material number | Coating material | Titanium oxide content | Note |
| Reflection-I-1 | Based on polyester/carbimide | 120 | - |
| Reflection-I-2 | Based on polyester/melamine | 120 | - |
| Reflection-I-3 | Based on polyester/melamine | 65 | - |
| Reflection-I-4 | Based on polyester/melamine | 30 | - |
| Reflection-I-5 | Based on polyester/melamine | 300 | a) |
| Reflection-I-6 | Based on fluorine | 100 | - |
Attention: a) because the thickening of coating material, coating is difficult.
[heat absorption material]
Obtain the heat absorption coating material by carbon being added to the cleaning coating material and stirring them.
In this test, use Tokai Carbon Co., the carbon black of Ltd. " TOKABLACK#7350F " is as small particle size carbon.Use " Bincho Charcoal Powder " with the maximum particle diameter of 5 μ m that Cooperative Association LATEST sells and by pulverize commercial obtainable reagent graphite and with the carbon with 20 μ m mean particle diameters of screening class acquisition as macroparticle size carbon.When needed, add the conduction paint of forming by the mixture of the commercial obtainable chain metallic nickel of the commercial obtainable sheet metal nickel of 6 weight portions and 1 weight portion.
Table 2 shows the details of the heat absorption coating material of preparation.These content of additive are that the weight portion of the additive of 100 weight portions is represented by the resin solid content based on the cleaning coating material in the table 2.
Table 2
| Coating material number | Coating material | Small particle size carbon | Macroparticle size carbon | The conduction paint | Note |
| Heat absorption-I-1 | Based on polyester/carbimide | 15 | - | - | - |
| Heat absorption-I-2 | Based on polyester/melamine | 15 | - | - | - |
| Heat absorption-I-3 | Based on polyester/melamine | 50 | - | - | a) |
| Heat absorption-I-4 | Based on polyester/melamine | 100 | - | - | a) |
| Heat absorption-I-5 | Based on polyester/melamine | 150 | - | - | a) |
| Heat absorption-I-6 | Based on polyester/melamine | 0 | 50 | - | - |
| Heat absorption-I-7 | Based on polyester/melamine | 5 | 45 | - | - |
| Heat absorption-I-8 | Based on polyester/ |
15 | 35 | - | - |
| Heat absorption-I-9 | Based on polyester/melamine | 15 | - | 5 | - |
| Heat absorption-I-10 | Based on polyester/melamine | 15 | - | 50 | - |
| Heat absorption-I-11 | Based on polyester/melamine | 5 | - | - | - |
| Heat absorption-I-12 | Based on polyester/melamine | 250 | - | - | b) |
| Heat absorption-I-13 | Based on polyester/melamine | 10 | 240 | - | b) |
Attention: a) because the thickening of coating material, it is poor to apply applicability.
B) because the thickening of coating material, coating is difficult.
[just making coating material]
Solids content based on resin is 100 weight portions, the Chrome-free corrosion preventive pigment " SHIELDEX C303 " of GRACE by adding 20 weight portions and as the Ishihara Sangyo Kaisha of 40 weight portions of visible light reflection paint, Ltd. titanium oxide " TIPAQUE CR95 " is to NipponPaint Co., Ltd. cleaning coating material FLC641 based on polyester, stir the gained mixture then, prepare Chrome-free initial application material.Yet, also use Nippon Paint Co., Ltd. sell based on the FLC641EU original material of the initial application material of polyester as the obtainable original material of commerce based on chromate.
To explain the method that is used for preparing the precoating sheet metal that uses in this test below in detail.
Under 60 ℃, comprising the commercial obtainable Nihon Parkerizing Co. of 2 weight %, in the aqueous solution of the alkaline defatting agent of Ltd. " FC4336 ", alkaline degreasing has the sheet metal of 0.6mm thickness, then with water rinse and dry.Next, on the sheet metal of degreasing, apply conversion process liquid, then under 60 ℃ peak value metal temperature, use dry this sheet of hot-air with roll coater.
In this test, use following sheet metal.By the roughness of regulating these sheet metals, so that the roughness of sheet metal much at one with reduction roll backing sheet metal.
EG: commercial obtainable electrogalvanizing steel disc (electrogalvanizing weight: be 20g/m on a side
2, material: SECE (JIS G3313), surface roughness Ra: 0.9 μ m)
AL sheet: the commercial obtainable steel disc of aluminizing (aluminium coat weight: on a side, be 60g/m
2, material: SALE (JIS G3314), surface roughness Ra: 1.0 μ m)
GL: commercial obtainable plating 55% aluminium-zinc steel disc (is electroplated weight: be 90g/m on a side
2, material: SGLCD (JIS G3321), surface roughness Ra: 0.9 μ m)
Aluminium flake: commercial obtainable aluminium flake (material: 1100 (JIS H4000), surface roughness Ra: 0.8 μ m)
Use commercial obtainable Nihon Parkerizing Co., Ltd. chromate is handled " ZMI1300AN " (hereinafter being called chromate handles) and commercial obtainable NihonParkerizing Co., and the Chrome-free conversion process " CT-E300 " (hereinafter being called chromium-free treatment) of Ltd. is as the conversion process in this test.Use each surface of roll coater conversion process sheet metal, then dry under 60 ℃ peak value metal temperature.The coat weight that chromate is handled is the Cr of every square metre of 50mg.The coat weight of chromium-free treatment is total coat weight of every square metre of 150mg.
Next, on a surface of the sheet metal of conversion process, apply the initial application material, and on another surface, apply in the table 2 the heat absorption coating material of describing with roll coater, then in induction heater, be used in combination hot-air, dry down and curing at 210 ℃ peak value metal temperatures (PMT).Next, on the surface that is coated with the initial application material, apply the visible light reflection coating material of describing in the table 1, then in induction heater, be used in combination hot-air, dry down and curing at 230 ℃ peak value metal temperatures (PMT) by the roller curtain coater.Can prepare does not when needed have the precoating of primary coat sheet metal yet.The thickness of primary coat is 10 μ m when dry, and the thickness of visible light reflectance coating is 20 μ m when dry, and the thickness of heat absorption coating is 5 μ m when dry.Table 3 shows the details of the precoating sheet metal of preparation.
Table 3
To explain the method for testing of the precoating sheet metal that is used to assess preparation below in detail.
1) the visual ray diffuse reflectance of visible light reflectance coating.
At the spectrophotometer " UV265 " that in 400 to 700nm wave-length coverage, uses Shimadzu Corp., utilize additional in addition integrating sphere reflection auxiliary equipment, measure the visual ray diffuse reflectance of the visible light reflective coated surface of the precoating sheet metal for preparing, and determine the integrated value of the wavelength-reflection coefficient curve of acquisition.And, can also measure visual ray diffuse reflectance to the most influential 555nm wavelength of brightness.The reference of using is Merck﹠amp; Co., the barium sulfate of Inc., this barium sulfate are the white samples according to German DIN standard (DIN5033), and the diffuse reflectance of each coating is defined as being determined in 1.00 o'clock at the diffuse reflectance of reference.
2) glossiness of visible light reflectance coating
At the mirror surface luster of accepting to measure under the angle visible light reflective coated surface of precoating sheet metal of spending according to 60 incidence angles of spending and 60 of JIS K 5400.7.6.
3) sheet metal is in the emissivity of heat absorption coated side
Under 80 ℃ sheet temperature, use the fourier-transform infrared luminosity spectrometer " VALOR-III " of Jasco Corp., from 600 to 3000cm
-1Wave-number range in measure the infra-red emission of the precoating sheet metal of preparation, and compare, to determine the total emissivity of sheet metal with the emission spectrum of standard black matrix.About this point, use " the THI-1B Black Spray " that make and sell by Okitsumo Inc. to spray to the iron plate of 30 ± 2 μ m coating layer thicknesses as the standard black matrix by Tasco Japan Inc..On the heat absorption coating surface of the precoating sheet metal for preparing, measure emissivity.
4) illumination of lighting device
Fig. 2 shows the sketch of the device that is used to measure illumination.In wooden box 11, load onto commercial obtainable fluorescent lighting device 12.At the sensor 14 of on the distance of fluorescent lamp 1330cm, settling commercial obtainable illuminometer, then measure illumination.Remove the reflective optical system 15 (being called conventional reflective optical system hereinafter) that is contained at first on the fluorescent lighting device 12.Use the precoating sheet metal formation of each preparation to have identical shaped reflective optical system 15 with conventional reflective optical system 15.When the reflective optical system 15 with each formation installs to lighting device 12, also when conventional reflective optical system 15 is installed to lighting device 12, measure illumination.In this test, use the fluorescent lamp 13 of a 16W.The illumination that the illumination that records when by contrast the reflective optical system 15 that is made of the precoating sheet metal being installed records when conventional reflective optical system 15 is installed, each precoating sheet metal of following assessment:
" very good ", when the illumination rate is not less than 110%,
" well ", when the illumination rate is not less than 103% and less than 110%, and
" poor ", when the illumination rate less than 103%,
Wherein the illumination rate is defined as [illumination that records when the reflective optical system that is made of the precoating sheet metal is installed]/[illumination that records when conventional reflective optical system is installed] * 100.
5) crooked test of the coating of precoating sheet metal (machinability)
20 ℃ down the precoating sheet metals of crooked preparation closely contact with the angle of bends of 180 degree, and observe damaged condition in the coating of sweep with amplifying lens.According to following criterion evaluation machinability.The 3T bending is adopted in this test, and wherein, crooked precoating sheet metal sample closely contacts with the angle of bend of 180 degree, inserts three sheets that have with the precoating sheet metal same thickness that will assess simultaneously inside.This is tested on the visible light reflectance coating side of precoating sheet metal and heat absorption coated side and all carries out.
" well ", when in coating, not damaging,
" generally ", when coating is partly damaged, and
" poor ", when coating at all sweeps when badly damaged.
6) extruding of precoating sheet metal (cupping) formability
Under such condition, implement the extruding test: the square flank R (radius of the flank of square) of the punch press diameter of 50mm, 3mm punch press flank R (radius of punch press flank), 3mm and 2.1 draw ratio.When extruding is tested, do not applying press oil to the surperficial visible light reflection external coating surface that also utilizes in cup-shaped (cup) outside of precoating sheet metal, enforcement pressure test.The formability of precoating sheet metal is following to be assessed:
" very good " when the precoating sheet metal can form the shape of design, do not break fully forming the intermediate base metal, and vision is not when finding the damage of coating.
" well " breaks in the middle of underlying metal is forming the precoating sheet metal, but when the part that forms had not both had vision to find that clean disbonding does not have vision to find that coating is damaged yet.
Whether " poor " breaks in the middle of forming the precoating sheet metal regardless of underlying metal, when observing visually the damage of clean disbonding or coating.
7) corrosion resistance of precoating sheet metal
The method of the corrosion resistance on assessment surface is described below.
Visible light reflection external coating surface at the precoating sheet metal for preparing forms a cutting crack, then by the method enforcement salt solution spray test of describing among the JIS K 5400.9.1.Salt solution will be sprayed on the surface with cutting crack.Test period is 120 hours.Measurement is from the width of the coating bubble in lip-deep cutting crack, and following assessment corrosion resistance:
" well ", when the bubble width on the side is not more than 3mm,
" generally ", when the bubble width on the side during less than 5mm, and
" poor " is when the bubble width on the side during greater than 5mm.
8) electrical conductivity of the heat absorption coating of precoating sheet metal
Measure the electrical conductivity of the heat absorption coating of the precoating sheet metal for preparing.By four probe method, utilize Mitsui Chemicals, the resistrivity meter of Inc. " Loresta-EP/MCP-T360 " is measured the resistivity on surface of the heat absorption coating of precoating sheet metal, and according to following criterion evaluation electrical conductivity:
" well ", when resistivity less than 0.1 * 10
-2During Ω,
" generally " is when resistivity is not less than 0.1 * 10
-2Ω and less than 1.0 * 10
-1During Ω, and
" poor " is when resistivity is not less than 1.0 * 10
-1During Ω.
Provided the detailed content of assessment result below.
Table 4 shows assessment result.About this point, because the content of too many titanium oxide or carbon, reflection coating material I-5 (referring to table 1) among the coating material of preparation and heat absorption coating material I-12 and I-13 (referring to table 2) thickening also solidify, and are difficult to apply.Therefore, can not prepare the precoating sheet metal that uses these materials.
Table 3
Adopt precoating sheet metal of the present invention to have than the higher and brighter illumination of lighting device that adopts conventional reflective optical system as the lighting device of reflective optical system.Solids content based on adhesive (PCM-I-20) is 100 weight portions, the content of the titanium oxide in the visible light reflectance coating is not suitable for less than 65 weight portions, because the visible light reflectance factor can be less than 0.7, and what difference is the illumination of illumination and conventional reflective optical system do not have.Solids content based on adhesive (PCM-I-21) is 100 weight portions, and the content of the carbon in the heat absorption coating also is not suitable for less than 10 weight portions, because emissivity can be less than 0.7, and what difference is the illumination of illumination and conventional reflective optical system do not have.The carbon that preferably adds the heat absorption coating to is the bond of macroparticle size carbon and small particle size carbon (PCM-I-9 and PCM-I-10), because can add than relatively large carbon under the situation that need not thicken like this.Preferably the conduction paint is added to heat absorption coating (PCM-I-11 and PCM-I-12), because can give heat absorption coating electrical conductance like this.Yet if increase the content of conduction paint, the emissivity of heat absorption coating can descend, and therefore, binding agent based solids content is 100 weight portions, and the content of paint of preferably conducting electricity is no more than 50 weight portions.Neither comprise antirust coat below visible light reflectance coating or heat absorption coating, the precoating sheet metal that does not comprise corrosion preventive pigment again in these coatings (PCM-I-13) has relatively poor corrosion resistance.By handle based on the conversion process of chromate or comprise that in coating (PCM-I-14) the precoating sheet metal based on the corrosion preventive pigment of chromate comprises the ambient influnence material, and therefore, handle but also the precoating sheet metal that do not comprise this kind paint of this kind preferred not only of no use.
The adhesive resin of preferred visible light reflectance coating is fluororesin (PCM-I-19), because can improve visible reflectance like this.
The present invention can be provided for improving the technology of brightness of the light of lighting device or optical signal launcher.The present invention not only can improve the performance of these devices, and can use than littler in the past energy consumption assurance and former suitable performance, also can provide energy saver.Therefore, we can say that the present invention has valuable industrial usability.
Claims (9)
1. precoating sheet metal that is used for reflective optical system, comprise sheet metal or plating sheet, the visible light reflectance coating that on a surface of described sheet metal or plating sheet, provides, and the heat absorption coating that on another surface of described sheet metal or plating sheet, provides, wherein said visible light reflectance coating has in 400 to 700nm wave-length coverage and is not less than 0.7 visual ray diffuse reflectance, and described heat absorption coating have measure under a certain temperature in from 80 to 200 ℃ scope 600 to 3000cm
-1Wave-number range in be not less than total infrared-ray emissivity of 0.7.
2. according to the precoating sheet metal that is used for reflective optical system of claim 1, wherein said visible light reflectance coating comprises adhesive and titanium oxide, is 100 weight portions based on the solids content of described adhesive, and the content of described titanium oxide is 40 to 250 weight portions.
3. according to the precoating sheet metal that is used for reflective optical system of claim 1 or 2, wherein the adhesive in described visible light reflectance coating comprises fluororesin.
4. according to the precoating sheet metal that is used for reflective optical system of claim 1, wherein said heat absorption coating comprises adhesive and heat absorption paint, solids content based on the described adhesive of described heat absorption coating is 100 weight portions, and the content of described heat absorption paint is 10 to 150 weight portions.
5. according to the precoating sheet metal that is used for reflective optical system of claim 4, wherein said heat absorption paint is a carbon.
6. according to the precoating sheet metal that is used for reflective optical system of claim 4, wherein said heat absorption coating comprises conductive metal powder, solids content based on the described adhesive of described heat absorption coating is 100 weight portions, and the content of described conductive metal powder is 1 to 50 weight portion.
7. according to the precoating sheet metal that is used for reflective optical system of claim 1, the surface roughness Ra of wherein said sheet metal or plating sheet is 0.05 to 1.8 μ m.
8. according to the precoating sheet metal that is used for reflective optical system of claim 1, wherein said sheet metal or plating sheet are steel disc or steel plating sheet.
9. electric installation or electronic installation comprise according to any one the precoating sheet metal that is used for reflective optical system in the claim 1 to 8.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP047611/2003 | 2003-02-25 | ||
| JP2003047611 | 2003-02-25 | ||
| JP206052/2003 | 2003-08-05 | ||
| JP367622/2003 | 2003-10-28 |
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| CN (2) | CN100581809C (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101921526A (en) * | 2010-01-11 | 2010-12-22 | 海洋王照明科技股份有限公司 | High temperature resistant reflective painting, preparation method thereof and reflector |
| CN101768410B (en) * | 2010-01-29 | 2013-06-12 | 海洋王照明科技股份有限公司 | Diffuse reflection coating and reflector with the same |
| CN106062095A (en) * | 2014-10-23 | 2016-10-26 | 亮源产业（以色列）有限公司 | High-temperature solar-absorptive coatings with high thermal conductivity and low emissivity, and methods for use thereof |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002172735A (en) * | 2000-12-06 | 2002-06-18 | Kansai Paint Co Ltd | Highly diffusing reflective coated metal panel |
-
2004
- 2004-02-23 CN CN200480004956A patent/CN100581809C/en not_active Expired - Fee Related
- 2004-02-23 CN CNB2004800049559A patent/CN100528551C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN100528551C (en) | 2009-08-19 |
| CN1753781A (en) | 2006-03-29 |
| CN1753780A (en) | 2006-03-29 |
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Owner name: NIPPON STEEL + SUMITOMO METAL CORPORATION Free format text: FORMER NAME: SHIN NIPPON STEEL LTD. |
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