KR101477495B1 - a coating composition same and using for coated glass diffuser for LED light diffuser - Google Patents

Abstract

The present invention relates to a coating composition for an LED electric light diffuser and a coated glass using the same, and is coated on various transparent or translucent glass such as a tube or a bulb to form a light diffusion and light- It is possible to manufacture a diffuser of a glass material without deterioration, thereby improving the durability and lifespan of the LED lamp and maintaining the appearance and the illumination quality favorably for a long period of time.

Description

A coating composition for an LED light diffuser and a coating glass using the same,

The present invention relates to a coating composition for an LED electric light diffuser, a method of manufacturing the same, and a coated glass using the same, and more particularly, to a transparent or translucent glass such as a tube or a bulb, A coating composition for an LED light diffuser capable of improving the durability and lifespan of an LED lamp and satisfactorily maintaining appearance and illumination quality for a long period of time by making it possible to manufacture a diffuser of a glass material free from deformation, And a coated glass using the same.

In addition to illuminating the dark, lighting is used for various purposes such as decoration, visual display and so on. In the past, lamps using filaments such as incandescent lamps and fluorescent lamps were mainly used. Since these lamps emit a considerable portion of the power they consume, the energy used for actual lighting is only about 5 to 30% The energy efficiency is very low, and the service life is short.

As a result, recently, LED lamps using LEDs as light sources with low power consumption and long lifespan are attracting attention. Generally, LED lamps can reduce energy consumption by less than 1/5 of that of incandescent lamps and 1/3 or less of fluorescent lamps, and have a lifespan of more than 100 times that of incandescent lamps and more than 10 times that of fluorescent lamps . The LED lamps currently being marketed are similar in appearance to conventional lamps, such as incandescent lamps and fluorescent lamps, so that the existing lighting fixtures can be used as they are. For example, a fluorescent lamp type LED lamp is shown in FIG. 1 have.

As shown in the figure, a conventional LED lamp includes a substrate 23 on which a plurality of LEDs 21 are arranged on the inner side of the main body 10, and a cover 30, which covers the front side of the LED 21, (10). On both sides of the main body 10, connection pins for supplying power to the LEDs 21 are provided and can be connected to a fluorescent lamp in a similar manner to conventional fluorescent lamps.

In general, since LEDs are point light sources with a narrow illumination angle, a diffuser is required to diffuse the light of LEDs to a wide area in order to prevent glare and provide uniform illumination. For this reason, the cover 30 is made of a diffuser 30 made of a synthetic resin material having a light diffusing property by adding a diffusing agent to a polycarbonate (PC) instead of a simple light emitting material.

In addition, since the LED is vulnerable to heat, when the temperature exceeds the proper operating temperature, the performance is drastically reduced. Therefore, a heat sink capable of rapidly discharging heat generated when the LED is driven is required. The heat resistance of the LED is improved and the operating temperature is reduced according to the development of the technology. However, since heat dissipation can not be effectively performed through the synthetic resin diffuser 30, a heat sink is required in the conventional LED lamp . In addition, since the diffuser 30 itself is very vulnerable to heat, the necessity of a heat sink is inevitably higher. Accordingly, the main body 10 is made of a heat sink 10 made of a metal material such as aluminum.

As described above, the conventional LED lamp has a structure in which the diffuser 30 made of synthetic resin and the metal heat sink 10 are combined.

However, since the conventional LED lamp is made of a synthetic resin material that is susceptible to heat and light (particularly ultraviolet rays), the diffuser 30 can be prevented from being damaged by the heat and light generated during operation of the LED 21, The diffuser 30 is deformed and discolored due to the heat and light applied to the light and the ambient light, and the strength and the light transmittance are lowered, resulting in poor lighting quality and appearance of the product in a short period of time, have.

In addition, since the structure of the conventional LED lamp requires the heat sink 10 and the diffuser 30 separately manufactured and assembled, the metal heat sink 10 requiring a large amount of material and processing cost is required, There is a problem that the productivity is low and the manufacturing cost is high.

Although not illustrated separately, other types of LED lamps including a bulb-type lamp also have the same problems as described above because they have a structure in which a metal heat sink and a synthetic resin diffuser are combined.

The object of the present invention is to improve the above-mentioned conventional characteristics, and it is an object of the present invention to provide a light diffusion method for an LED lamp by coating various transparent or semitransparent glass such as a tube and a bulb, And a diffuser of a glass material free from reduced light transmittance, thereby improving the durability and lifespan of the LED lamp, and maintaining the appearance and the illumination quality for a long period of time, and a coated glass using the same .

The present invention has the following structure in order to achieve the above object.

The coating composition for LED light diffusers of the present invention is formed by synthesizing a mixture of 62 wt% to 90 wt% of a binder solution and 10 wt% to 38 wt% of a ceramic filler.

The binder solution includes one or more selected from the group consisting of modified urethane silicone resin and solvent.

The ceramic filler includes at least one selected from calcium carbonate, calcium oxide, calcium fluoride, silicon dioxide, diatomaceous earth, magnesium oxide, aluminum oxide and zinc oxide.

The present invention also provides a method of manufacturing a coating composition for an LED light diffuser, comprising the steps of: 1) introducing a ceramic filler into a binder solution in a predetermined amount; And 2) a step of mixing and simultaneously pulverizing the mixed liquid into which the ceramic filler has been added for a predetermined time to form a coating liquid.

Also, the step 2) is performed in a state where a ball mill is provided in the blender.

The step 2) is performed at room temperature for 30 minutes, and in the step 2), the ceramic filler is pulverized to have a particle diameter of 2 to 4 탆.

Meanwhile, the coating glass using the coating composition for an LED light diffuser of the present invention is formed by applying a coating composition to the inner circumferential surface of a transparent glass tube having a predetermined shape to a predetermined thickness.

The coating composition is applied to a thickness between 13 and 25 μm, and the coated glass is raised from room temperature to 100 ° C. to 200 ° C. at a rate of 10 ° C. per minute, followed by holding for 5 minutes, followed by cooling and curing.

The present invention can be applied to various transparent or translucent glass such as tubes and bulbs to make a diffuser of a glass material free from light and heat distortion, discoloration, The durability and lifespan of the LED lamp can be improved, and the appearance and illumination quality can be maintained for a long period of time.

1 shows a conventional LED lighting.
FIG. 2 is a perspective view illustrating application to a fluorescent lamp type light source as an embodiment of an LED electric light diffuser according to the present invention. FIG.
Fig. 3 is a cross-sectional view of the LED lamp shown in Fig. 2; Fig.
4 is a perspective view showing an LED light diffuser according to another embodiment of the present invention applied to a light bulb type light source.
5 is a graph showing total transmittance and turbidity for specimens of a coating composition for a diffuser according to the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The above and other objects, features and advantages of the present invention will become more apparent from the following detailed description of the present invention when taken in conjunction with the accompanying drawings.

It is to be understood that the following specific structure or functional description is illustrative only for the purpose of describing an embodiment in accordance with the inventive concept, and that the embodiments according to the concept of the present invention may be embodied in various forms, It should not be construed as being limited to examples.

Since the embodiments according to the concept of the present invention can make various changes and have various forms, specific embodiments are illustrated in the drawings and described in detail herein. However, it should be understood that the embodiments according to the concept of the present invention are not intended to limit the present invention to specific modes of operation, but include all modifications, equivalents and alternatives falling within the spirit and scope of the present invention.

The terms first and / or second etc. may be used to describe various components, but the components are not limited to these terms. The terms may be named for the purpose of distinguishing one element from another, for example, without departing from the scope of the right according to the concept of the present invention, the first element being referred to as the second element, The second component may also be referred to as a first component.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . On the other hand, when it is mentioned that an element is "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between. Other expressions for describing the relationship between components, such as "between" and "between" or "adjacent to" and "directly adjacent to" should also be interpreted.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. It will be understood that the terms "comprises", "having", and the like in the specification are intended to specify the presence of stated features, integers, steps, operations, elements, parts or combinations thereof, But do not preclude the presence or addition of steps, operations, elements, parts, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the meaning of the context in the relevant art and, unless explicitly defined herein, are to be interpreted as ideal or overly formal Do not.

2 and 3, the diffuser 116 of the present invention is formed by being applied to an inner surface of a long tubular shape having a circular cross-sectional shape, similar to a glass tube 111 forming a conventional fluorescent lamp.

An LED 115 is disposed inside the glass tube 111 and a base 112 having a connection pin 113 is coupled to both longitudinal ends of the glass tube 111. The LED lamp 110 having an appearance similar to a fluorescent lamp ) Can be produced.

Like a typical LED lamp, a plurality of LEDs 115 are arrayed on the substrate 114 and connected to the connection pin 113 through the substrate 114.

When the connection pin 113 is connected to the power terminal of a conventional lamp and power is supplied, the LED 115 emits light and the light of each LED 115 passes through the diffuser 116 applied to the glass tube 111 So that the light can be diffused and uniformly illuminated without glare.

Further, the heat generated by the operation of the LED 115 can be emitted to the outside through the glass tube and the diffuser 116.

A heat transfer medium 117 made of a common material having a high thermal conductivity such as metal or silicon may be provided between the back surface of the substrate 114 and the inner circumferential surface of the glass tube 111 for effective heat dissipation.

On the other hand, the shape of the illustrated glass tube 111 is merely an example, and may be a U shape, an L shape, a curved shape, a circular shape, or the like that is connectable to one or more end portions in addition to a linear shape so as to be connectable to a common luminaire of various structures It can be formed into various tube shapes. In addition to the tube shape, a diffuser may be coated on the inner circumferential surface of the glass bulb 121 of various shapes so as to be used for the bulb-type LED lamp 120 as shown in FIG. 4 also has a structure in which a base 122 for power supply connection is coupled to one side of a bulb-type diffuser 121, and a plurality of LEDs 125 are arranged in the substrate 124 in the inside. In the following description, the reference numerals of the diffusers are denoted by "116 ".

The diffuser 116 is made of a coating composition as described below to satisfy the physical and chemical properties required for the diffuser 116, including light transmittance, chromaticity, haze, heat resistance,

The haze value is expressed as a percentage by dividing the diffuser transmittance by the total transmittance. The higher the value, the more scattered light due to diffusion without the transmission of the direct light from the light source do.

Therefore, the Haze value of 100% means that all transmitted light is made to diffuse light, which is highly desirable for a diffusion material for illumination.

On the other hand, the parellel transmittance is a value obtained by subtracting the diffusion transmittance from the total transmittance and means the transmittance by the direct light, which means that the higher the value, the higher the glare due to the direct light.

Also, if the total light transmittance is too low, the intensity of the light is disturbed. If the distance between the LED light source and the diffuser diffuser is too short, the internal light source device and the module itself are advanced, so the total light transmittance value is 50 ~ 85% Do.

As described above, since the turbidity and the parallel transmittance are kept constant, it is possible to perform the function of the ideal diffuser. Therefore, the present invention can provide a composition which can ideally satisfy turbidity and parallel transmittance, a method of manufacturing the same, and a method of manufacturing the LED lamp A description will now be given of a coated glass used as a diffuser.

The coating composition of the present invention is formed by synthesizing 62 wt% to 90 wt% of a binder solution and 10 wt% to 38 wt% of a ceramic filler.

The binder solution may include one or more selected from the group consisting of a modified urethane silicone resin and a solvent series.

Herein, the modified urethane silicone resin includes an ethoxylate, and the solvent type is limited to toluene, acetone, isobutyl acetate, butylcellosolve, and xylene.

The ceramic filler may include one or more selected from calcium carbonate, calcium oxide, calcium fluoride, silicon dioxide, diatomaceous earth, magnesium oxide, aluminum oxide and zinc oxide.

As the ceramic filler, it is preferable to use calcium carbonate, calcium oxide and calcium fluoride.

As described above, the binder solution and the ceramic filler may be prepared in different composition ratios depending on the components as shown in Table 1 below.

That is, it is exemplified that each component used as a ceramic filler can be prepared in different ratios according to the ratio of the binder solution, and one or more of the composition ratios may be mixed.

Composition ratio Production Example (wt%) a b c d e f g h Binder solution 72 80 72 62 84 84 77 90 CaCO ₃ 28 CaO 20 CaF ₂ 28 SiO ₂ 38 Diatomaceous earth 16 MgO 16 Al ₂ O ₃ 23 ZnO 10

The coating composition is prepared by the following method.

A method for producing a coating composition for an LED light diffuser of the present invention comprises the steps of: 1) introducing a ceramic filler into a predetermined amount of a binder solution; And 2) mixing and simultaneously pulverizing the mixed solution into which the ceramic filler has been added for a predetermined time to form a coating solution.

Also, the step 2) is performed in a state where a ball mill is provided in the blender.

The step 2) is performed at room temperature for 30 minutes, and in the step 2), the ceramic filler is pulverized to have a particle diameter of 2 to 4 탆.

On the other hand, the coating composition according to each composition ratio was formed through the above-mentioned production method, and the turbidity and the transmittance varying according to the thickness were measured.

[Experimental Example 1]

In this experimental example, the coarse solution formed by the composition ratios shown in Table 1 was coated on the inner surface of the transparent glass tube so as to have a thickness of 13 μm, and the temperature was raised from room temperature to 150 ° C. at a rate of 10 ° C. per minute, Followed by cooling and curing to form a coated glass.

The thus formed coated glass was measured for haze and transmittance using a measuring method of JIS K 7136 (ISO 14782) and JIS K 7361 (ISO 13468) and a wavelength value of 555 nm in a visible light region. Table 2 and FIG. 5 below show the results expressed by Experimental Example 1.

Character rating a b c d e f g h Haze 82.22 81.86 82.78 81.55 84.35 85.61 82.79 71.54 Parallel transmittance 16.35 11.94 16.08 16.13 11.61 7.23 14.24 21.48 Diffusion transmittance 75.61 53.89 77.31 71.31 62.59 43.02 68.51 53.99 Total transmittance 91.96 65.83 93.39 87.44 74.20 50.25 82.75 75.47

As shown in Table 2, although all of the ceramic filler components showed generally excellent values, the test solutions a and c were expressed as a coating solution having a high total permeability and an excellent turbidity value. As a result, the calcium-based ceramic filler exhibited turbidity And the transmittance are generally satisfied.

Accordingly, when the coating composition having the respective composition ratios is used as the diffuser coated glass of LED lighting, it can be variously selected according to various conditions (brightness required in indoor and outdoor) Able to know.

In order to more specifically test the superiority of turbidity and transmission heat of calcium based on Experimental Example 1, it was found that when the composition ratio and the manufacturing method in Table 1 were applied in the same manner and then the thickness of the coating liquid applied to the transparent glass tube was made different Turbidity and permeability were tested.

[Experimental Example 2]

In this experimental example, the coating thickness of the coating solution was set to 20 탆 and 25 탆 respectively for a group a and a group c, which were excellent experimental groups in Experimental Example 1, and then the coating thicknesses of the coating solutions were measured in accordance with JIS K 7136 (ISO 14782) and JIS K 7361 And the haze and transmittance were measured using a wavelength value of 555 nm in the visible light region. Table 3 below shows the results expressed by Experimental Example 2.

Character rating a-20 a-25 c-20 c-25 Haze 85.59 92.56 84.55 90.55 Parallel transmittance 9.11 4.27 9.92 5.55 Diffusion transmittance 54.12 53.11 54.27 53.18 Total transmittance 63.23 57.38 64.19 58.73

As shown in Table 3, when the coating thicknesses of groups a and c are increased, the total transmittance is relatively low, whereas the turbidity is increased. When the coating thickness is kept at 25 μm or less, the total transmittance value Can be maintained at 50% or more, and thus it can be stably used as a diffuser.

As described above, when the coating composition of the present invention and the coating composition prepared by the method of the present invention are applied to a glass tube, it is possible to cope with various consumer preferences.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention as defined by the appended claims. There is no doubt that it is within.

110, 120: LED light
111, 121: transparent glass tube
112, 122: Base
114, 124: substrate
116: diffuser
115, 125: LED

Claims (6)

A coating composition for an LED light diffuser,
The coating composition is formed by synthesizing 62 wt% to 90 wt% of a binder solution and 10 wt% to 38 wt% of a ceramic filler,
Wherein the binder solution is a modified urethane silicone resin,
Wherein the ceramic filler comprises one or more selected from the group consisting of calcium carbonate, calcium oxide, calcium fluoride, silicon dioxide, diatomaceous earth, magnesium oxide, aluminum oxide and zinc oxide. delete delete A coated glass using the coating composition for the LED light diffuser of claim 1,
Wherein the coating glass is formed by applying a coating composition to an inner circumferential surface of a transparent glass tube having a predetermined shape with a predetermined thickness. 5. The method of claim 4,
Wherein the coating composition is applied to be between 13 and 25 mu m. 6. The method of claim 5,
Wherein the coated glass is raised from room temperature to 100 占 폚 to 200 占 폚 at a rate of 10 占 폚 / minute and then held for 5 minutes and then formed by cooling and curing.

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