KR100692930B1 - White reflective steel plate with high intensity of illumination for lighting apparatus - Google Patents

Abstract

The present invention provides a white coating comprising a base steel sheet, a zinc or zinc alloy plating layer plated thereon, a chromate layer chromated on the plated layer, and an oil-free polyester resin formed on the chromate layer as a main resin. The present invention relates to a high illuminance white reflective steel sheet for luminaires, characterized in that it comprises a bottom and top coat, and a luminaire body using a high illuminance white reflective steel sheet composed of such a structure.

Lighting fixture, fluorescent lamp, reflectance, luminaire reflection efficiency, reflector, white reflective steel sheet, fading, roll coating, polyester, oil free

Description

White reflective steel plate with high intensity of illumination for lighting apparatus             

1 is a cross-sectional view of a high intensity white reflective steel sheet manufactured according to the present invention.

2 is a view showing a conventional example of additionally attaching a reflector to the luminaire body.

3 is a view showing an example of a luminaire body manufactured using the high illuminance white reflective steel sheet of the present invention.

The present invention relates to a high intensity white reflective steel sheet for lighting equipment such as fluorescent lamps. More specifically, the present invention can improve the energy efficiency of the energy equipment, in particular the high illumination reflector for fluorescent lamps or maximize the energy saving effect, so that the reflectance is 93% or more, and the luminescence reflection efficiency is 90% or more, It relates to a high intensity white reflective steel sheet exhibiting no phenomenon.

In the use of fluorescent lamps, typically fluorescent lamps, it is important to reflect the light of the fluorescent lamp as evenly as possible and distribute it to the space to be illuminated. It is the reflector or reflector that plays this role, and most fluorescent lights are installed together with the reflector to brighten the space to be illuminated. In general, a lampshade used in combination with a fluorescent lamp is called a reflection lamp, and a disc before being processed in the form of a reflection lamp is called a reflection plate. When the reflectivity of the reflector to the reflector is low, even if a fluorescent lamp having the same power consumption is used, the brightness of the illuminated space is deteriorated. In addition, if the reflector does not distribute light evenly, more fluorescent lamps are required to illuminate the same area of space. That is, the reflector for fluorescent lamps plays an important role in the energy efficiency of fluorescent lamps. The Ministry of Commerce, Industry and Energy's regulation on the promotion of high-efficiency energy equipments stipulates that the reflector with the luminaire reflectance efficiency of 90% or higher and the reflectance of 93% or higher is the high illuminance reflector.

The fluorescent plate reflector widely used in the prior art was manufactured by applying a conventional simple white paint on a galvanized steel sheet in a powder coating method, and the reflector has a reflectance of about 94%, but there is no problem in energy efficiency and energy saving effect. Since there is a large possibility of poor workability and the thickness of the coating film, which are disadvantages of the powder coating film, there is a disadvantage that the diffuse reflection is severe and the eye fatigue is increased.

Such conventional white paint for fluorescent lamp reflector is the most widely used because of low price, but there is a difference in reflectance of reflector according to the characteristics of paint and there is a limit in making a structure due to poor workability, In addition, due to the irregularity of the coating surface due to the variation in the thickness of the coating, the diffuse reflection is severe, which increases the fatigue of the eyes, and the durability of the coating surface is weak, resulting in short product life.

There are also anodizing products in which an oxide film is formed on the surface of an aluminum plate by electrolyzing an aluminum plate having a slightly improved reflectance, but a general anodizing product can obtain only a reflectance of 90% or less on the properties of aluminum. In order to further increase the reflectance, the anodized product has to be processed once more by physical vapor deposition, but the manufacturing cost is increased and it is economically disadvantageous. Such a product also has a disadvantage in that the reflectance is improved but the light reflection is concentrated. When the reflection of light is concentrated, the brightness difference, that is, the brightness difference is severe, and a person feels dizzy. In addition, the product has a strong surface strength may cause cracks in the bending process to make the reflection shade shape, and also the scratch resistance of the surface is weak, so if the stain is stained with a soft cloth or sponge to easily scratch There is such a problem.

In addition, conventionally, there is a reflecting plate manufactured by laminating a deposition film made by vacuum deposition of silver (Ag) on a PET film on a galvanized steel sheet by adhesive or heat fusion method. In the reflecting plate with a silver deposition film, the metal particles of silver heated above the melting point are deposited on a PET film in a vacuum, and acrylic coating is applied to a thickness of 1 to 2 μm or less for the purpose of maintaining the reflectance while preventing oxidation of the deposition surface. On the other side, a pressure-sensitive adhesive treatment capable of adhesion at room temperature is used, and a deposition film commercialized using a release PET film is used to protect the pressure-sensitive adhesive treatment.

However, in the case of manufacturing the reflector in a continuous process using the deposition film thus made it is necessary to separately install a rewinder (rewinder) to remove the release PET film for the protection of the adhesive layer processed on the lower surface of the deposition film. In addition, the reflector made of this method also has a high reflectance in the case of the front reflection method in which the silver deposition layer is on the PET film layer, but in order to protect the deposition layer, the acrylic coating part is very vulnerable to chemical resistance, so it is easily deposited in poor working environment conditions. This tends to be oxidized, and the scratch resistance of the surface is also weak, and when contaminants such as dust or foreign matter are stained, the acrylic coating layer is easily scratched even with a soft cloth or sponge.

On the other hand, in order to improve the problems of the front emission method, silver is deposited on the lower surface of the PET film layer and external environment such as temperature and humidity may be applied even when the adhesive which exerts adhesive force at room temperature is treated on the lower surface of the deposition layer for adhesion to the base metal. Since it is difficult to continuously maintain the binding force between the base steel sheet and the film layer according to the change of, the film layer and the base steel sheet tends to be easily peeled off over time, and also due to oxidation of the cutting surface during cutting. There is this problem.

The present invention is to solve the problems of the conventional reflector for fluorescent lamps, the present inventors have a reflector plate that can meet the regulations (promoting the Ministry of Commerce, Industry and Energy's notification 'high-light illuminance reflector technical standards') As a result of the research for development, the present invention was completed by roll coating a paint containing an oil-free polyester resin, a curable resin, a pigment, an additive, and a solvent on a steel sheet.

Accordingly, an object of the present invention is to provide a luminaire body having a reflectance of 93% or more, a luminaire reflection efficiency of 93% or more and no discoloration or peeling, and a luminaire body using a white reflector plate for luminaires. .

In order to achieve the above object, the constitution of the present invention comprises: a base steel sheet 1, a zinc or zinc alloy plated layer 2 plated thereon, and a chromate layer 3 chromated on the plated layer 2; And a top coat 4 and a top coat 5 of a white paint having an oil-free polyester resin formed on the chromate layer as a main resin.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

The production of a high-lightness white reflective steel sheet having excellent reflectance according to the present invention is a zinc or zinc alloy plating layer 2, which is electroplated or hot-dipped on the base steel sheet 1, preferably a plating layer 2 having a thickness of 5 to 25 µm. A thin film is coated on the surface by a roll coating method at a line speed of 20 to 100mpm, and dried at a temperature of 60 to 140 ° C. to form a chromate layer 3 of 20 to 80 mg / m 2. After coating the top coat (4) and the top coat (5) of the white paint mainly containing oil-free polyester resin, which is a paint with excellent reflectance, with PCM (Pre-coated Metal) roll coating method, PMT (Peak Metal Temperature) It is heated to 224 DEG C and dried to form the undercoat (4) and the top coat (5). The dry coat thickness (D.F.T) of the undercoat and the top coat of the white coating containing the oil-free polyester resin as the main resin is preferably 75 to 100 µm. In the case of 75 탆 or less, workability and reflectance are lowered. In the case of 100 탆 or more, it is disadvantageous in terms of workability and economical efficiency. The coated steel sheet is heated to PMT 224 ° C. and dried.

The steel sheet according to the present invention can be used in addition to the galvanized steel sheet having a thickness in the range of 0.2 ~ 0.5t, tin steel, copper plate and copper plated steel, aluminum steel, etc., in terms of workability and economical efficiency of 0.3t Galvanized steel sheet having a thickness is preferable, and the coating method may be used in addition to the roll coating method and the flow coating method.

In addition, the chromate treatment for the corrosion resistance and the adhesion between the steel sheet and the paint may optionally be chromium-free pre-treatment at the request of the region and demand.

 In addition, the coating conditions provided for the white reflective steel sheet are based on high processability, while overcoming bubble generation and leveling deterioration due to thickening of the coating film of a general PCM coating, while being resistant to ultraviolet rays and corrosion resistance, which are basic properties as a high illuminance reflecting plate, There is a characteristic that the diffusion reflectance should be excellent.

Hereinafter, the basic construction of the paint will be described.

The main resin constituting the upper and lower paints is preferably an oil-free polyester polymer resin type so that the flexibility of the coating film and the thickening of the coating film are possible. In the case of top coat, the number average molecular weight is 3,000 ~ 15,000, the glass transition temperature (Tg) is 10 ~ 45, and the OH value is considered in consideration of high gloss, hardness, and UV resistance of the surface as well as flexibility and thickening performance of the coating. It is preferable to use oil-free polyester polymer resin of 10 to 60 and 40 to 50% by weight of 100% by weight of the total coating composition.If the content is less than 40% by weight, the flexibility and leveling properties of the coating film, Popping property is greatly lowered, and when it exceeds 50% by weight, the hardness and diffusion reflectance of the coating film decreases rapidly.

The melamine used as the crosslinking resin used in the present invention is preferably a methoxy or methoxy butoxy mixed melamine having a number average molecular weight of 300 to 1,000. When butoxy melamine alone or a mixture of methoxy melamine and butoxy melamine is used, the compatibility with the polyester resin is drastically reduced, and the melamine may be transferred to the upper portion of the paint, which may interfere with workability or cause poor workability. Because there is. Commercially available materials include RESIMINE 755, RESIMINE 757, RESIMINE 751 (manufactured by SOLUTIA), CYMEL 1168, CYMEL 1170, CYMEL 232 (manufactured by CYTEL).

The curing accelerator constituting the topcoat is used to increase the density of the coating film by promoting crosslinking between the main resin, oil-free polyester, and the crosslinking resin melamine, and when the capacity is insufficient, curing of the coating film depends on the working conditions. Inadequately occurring, excessive use of the coating film hardens too rapidly, resulting in poor workability and deterioration of glossiness and coating film shrinkage during painting.

Typically, amine (Amine), metal salts, naphthenic acid, etc. are used, and as the amine catalyst, triethylamine, N, N-diethylcyclohexylamine, 2,6-di Diethylmorphorine, Triethyl Diamine, Dimethylamino Ethyladipate, Diethylethanolamine, N, N-Dimethylbenzyl Amine, etc. Potassium Lactate (Potassium Oleate), Tetra-2-ethyl-hexyl Titanate, SnCl ₄ , FeCl ₃ , Dibutyl Tin Dilaurate (DBTDL), etc. The naphthenic acid catalysts include Zn-naphthenate, Pb-naphthenate, Co-naphthenate, and Ca-naphthenate. Commercially available Dabco T12 (available from Air Products) and Songstab TL-100 (from Songwon) are recommended.

As a pigment used in the reflective steel sheet of the present invention, a white pigment, TiO _2, is recommended, and in order to obtain a higher diffusion reflectance, the PB value (Pigment / Binder) between the pigment and the resin is in the range of 1.40 to 1.70 / 1. Do. If the PB value is less than 1.40, the diffuse reflectance is lowered, and if it is more than 1.70, the workability, paintability, and adhesion to the substrate are poor. Preferably, PB = 1.5 to 1.65 / 1 is recommended.

If necessary, UV filler may be added to enhance UV resistance. As a solvent, in order to provide excellent leveling property and painting workability, it should be selected from hydrocarbon, ester and acetate systems as much as possible.

The dispersant used to improve the paintability of the present invention requires a product that properly adjusts rheology control of the paint. Examples of such dispersants include P104, Disperbyk 110, 130, 160, 170 Family, and Antiterra-U. (By BYK company), EFKA 776, 4050, 4063, 4051 (more than EFKA company), Solsperse 24000, 36600, 32600, 22000, 5000 (above AVECIA company), etc., preferably AVECIA company do.

When selecting a dispersant, a dispersant that does not harm the rheology should be appropriately selected.If only a dispersant that does not harm the rheology may be used, there is a possibility that pigment settling may occur. Therefore, an appropriate amount of the polymeric dispersant should be used when using the dispersant. need.

The amount of such dispersant is generally controlled according to the content of the pigment, but the productivity and the formulation stability of the paint should also be considered. A suitable amount of dispersant is suitable for 0.5 to 5% of the amount of the pigment, preferably about 0.5 to 2%.

Another material used to change the rheology of the paint in the present invention is a rheology control agent, such materials include BENTONE # 38, BENTONE # 34, BENTONE # 27, fumed silica, manufactured by TROYKYD Co., Ltd. AEROSIL R972, # 200, # 380 from DEGGUSA (Humed Silica), HPA-15 from AVECIA from Rheology Control, and PESA-1000 from ALKENZ CHEMICAL are available. The preferred material for controlling the rheology of the paint is AEROSIL R972, # 200, manufactured by DEGGUSA, and the amount used is 0.1 to 0.5% by weight, preferably 0.1 to 0.3% by weight.

 The solvent for the top coat should be selected from hydrocarbon, ester, and acetate systems for smooth surface and roll mark prevention.

The top coat of the present invention is composed of the following composition ratio.

Next will be described in detail with respect to the selection of the coater constituting the polyester primer in the drawings.

As the road used for material adhesion, an oil-free polyester primer, an epoxy-modified polyester primer, an acrylic primer, or a modified base thereof may be used, and the upper and lower interlayer adhesion and the elongation difference between the upper and lower layers may be used. It is preferable to use an oil-free polyester primer similar to a top coat in consideration of processability, etc., and CK35C Primer of Samsung Fine Chemicals is recommended as commercially available.

As a preferred embodiment of the present invention, the CK35C Primer was used. At this time, the physical properties imparted to the channel under normal corrosion resistance, which is the basic physical property of the channel itself, and strengthening the adhesion between the top and the plated steel sheets, etc., and give a firing rate to provide sufficient buffering action at the interface between the material and the upper layer, resulting in cracking of the material generated during processing. It was configured to be absorbed in the lower layer without developing to the upper layer. The pigment uses the same TiO ₂ as the top layer to increase the diffusion reflectivity, and if necessary, NON-CR anti-corrosive pigments may be used to impart corrosion resistance.

Hereinafter will be described a production example according to the present invention.

In the continuous coating line, a thin film is coated on the surface by using a roll coating method on a surface speed of 20 to 100mpm on a zinc or zinc alloy plated layer (2) electroplated or hot-dipped on the base steel sheet (1), 60 to 140 It is dried under the temperature condition of C and forms the chromate layer 3 of 20-80 mg / m <2>, and the upper coat | substrate 4 of the white paint which uses the oil-free polyester-type resin which is the coating material which is excellent in reflectance, and the top coat ( 5) is coated with a PCM roll coating method, respectively, and then heated and dried at PMT (Peak Metal Temperature) at 224 ° C. to form the undercoat (4) and the top coat (5). At this time, it is manufactured by painting process of 2C2B (2 Coat 2 Bake), 3C3B, 4C4B by PCM roll coating method, and the dry film thickness (DFT) of the top coat and top coat of white paint with oil-free polyester resin as the main resin After roll-coating so that it may be 50 micrometers, 60 micrometers, 75 micrometers, and 100 micrometers, the steel plate roll-coated by a dry oven is heated and dried at PM224224 degreeC. The viscosity of the paint was 110 seconds (based on 25 ° C), the specific gravity of the paint was 1.45, and the solid content ratio of the paint was 73%.

Table 2 is a test result of comparing and evaluating reflectance and workability according to the coating process and coating thickness of the white reflective steel sheet manufactured by the coating method described above.

As shown in Table 2, it can be seen that the reflectance is 93% or more when the film thickness is 75 µm or more, and the workability is considerably excellent at about 2T.

Table 3 shows the request for white reflective steel sheet with 75㎛ thickness by the method of the present invention to Korea Institute of Lighting Technology. The test result was compared with the reflector manufactured by the conventional method based on the measurement method described, and the result was based on the 32W embedded second lamp for the fluorescent lamp.

Technical standards for each performance in the high illumination reflector technical standard for fluorescent lamps are as follows.

(1) Reflectance of reflector: should be 93.0% or more

(2) Luminaire reflection efficiency: 90.0% or more

(3) Prevention of fading: initial reflectance should be maintained above 95.0%

(4) Melting point: no deformation

(5) Corrosion of materials: no abnormality on the surface and cutting surface

(6) Thickness uniformity of paint: The maximum tolerance of the thickness of each sample should be 10% or less of the maximum thickness.

(7) Glare: KS C 7603 Should be greater than G2 of table 5

As can be seen from Table 3, the high illuminance white reflective steel sheet according to the present invention satisfies all the technical standards in each performance item specified in the technical standard of the high illuminance reflecting lamp for fluorescent lamps. In the high illuminance reflector by the anticorrosive method, the white coating powder coating method, and the silver deposition film method, some performance items include items that fall short of the aforementioned high illuminance technical standards. Therefore, it can be seen that the high intensity white reflective steel sheet according to the present invention is superior in terms of performance and economics as compared with the conventional method.

In addition, conventionally, the manufacturing of the main body made of cold-rolled steel sheet in the manufacture of lighting fixtures, and the present invention to attach the reflection shade according to the conventional method to the main body to manufacture, the manufacturing process is not only complicated, but also increases the manufacturing cost. However, since the reflective steel sheet of the present invention directly forms the upper and upper coats on the base steel sheet, the main body of the luminaire can be manufactured directly without additional attachment of the reflection shade.

2 is a view showing a conventional example in which the reflector is additionally attached to the luminaire main body. The reflector 11 is attached to the luminaire main body 13 fixed to the ceiling by the fixing member 12. 3 is a view showing an example of a luminaire main body manufactured by using the high illuminance white reflective steel sheet of the present invention, showing the luminaire main body 14 without additional attachment of the reflector.

In the present invention, for example, one type of luminaire main body is illustrated, but the present invention is not limited thereto, and may be manufactured in a shape such as a lower protruding type or a buried type.

As described above, according to the present invention, it is possible to manufacture a high intensity white reflective steel sheet for a lighting fixture having a reflectance of 93% or more and a luminaire reflectance efficiency of 90% or more, and which does not exhibit a discoloration or peeling phenomenon, which is a problem in the conventional method. The main body for the luminaire without additional attachment of the reflecting shade can be manufactured, which can simplify the manufacturing process, and can exhibit the effects peculiar to the present invention, which can reduce the manufacturing cost.

Claims (3)

Holding steel sheet (1), Zinc or zinc alloy plating layer (2) plated on the base steel sheet; A chromate layer 3 chromated on the plating layer 2 described above, The undercoat (4) and the number average molecular weight of the white paint containing the oil-free polyester resin formed on the chromate layer as the main resin are 3,000 to 15,000, the glass transition temperature (Tg) is 10 to 45, and the OH value is It consists of a top coat (5) of white paint whose main resin is 10 to 60 oil-free polyester resin, The lower and upper coats of the white paint are roll coated so that the dry coating thickness is 75 to 100 μm in total. The high illuminance white reflective steel sheet for luminaire according to claim 1, wherein after the top coat and the top coat of the white paint are roll coated, they are heated and dried at PMT 224 ° C. A luminaire body, which is manufactured using the high intensity white reflective steel sheet of claim 1.

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