KR102513392B1 - Manufacturing method of coating composition for lighing device and formig method of coating layer using the same - Google Patents

Abstract

The present invention relates to a manufacturing method of a coating composition for a lighting device, wherein the manufacturing method comprises a step of mixing a binder resin and a surface-treated illite powder, wherein the surface-treated illite powder comprises the following steps: immersing the illite powder in an aqueous acid solution; washing and drying the illite powder; grinding the illite powder; and sorting the illite powder, wherein antibacterial and deodorizing effects can be improved by forming the coating layer on the surface of the lighting device using the coating composition.

Description

Method for manufacturing a coating composition for lighting fixtures and method for forming a coating layer using the coating composition.

The present invention relates to a method for producing a coating composition for lighting fixtures and a method for forming a coating layer using the coating composition, and more particularly, to a method for manufacturing a coating composition for lighting fixtures containing illite to improve the deodorizing effect, and the coating It relates to a method of forming a coating layer using the composition.

A technology capable of improving antifouling properties and obtaining an air purification effect by forming a film on a lighting fixture using a coating composition is being developed. Representatively, by applying a coating composition containing a photocatalyst such as titanium dioxide, a photocatalytic activity is exhibited by ultraviolet or visible light of a lighting fixture, and a technique for removing harmful components contained in the air using this is being developed.

For example, in prior art such as Korean Patent Registration No. 10-1064761, Korean Patent Publication No. 10-2003-0032733, and Korean Patent Publication No. 10-1999-0006999, a titanium dioxide coating agent is coated on lighting fixtures to deodorize and sterilize. Techniques for exhibiting such an air purification function are known. In addition, Korean Patent Publication No. 10-2000-0036591 discloses a technique for obtaining additional effects such as deodorization and sterilization by coating a far-infrared emitter on a lampshade and activating the far-infrared material using heat generated from a light source. .

The coating composition using such a photocatalyst is active in the part of the lighting fixture where the light irradiated from the light source reaches, but does not show the effect in the part where the light does not reach. There is a limit to indicate.

On the other hand, a technology capable of forming a coating film exhibiting antibacterial and deodorizing effects through a coating composition using illite, a far-infrared emitter, is known (Korean Registered Patent Publication Nos. 10-0605004 and 10-0853475). As a technology for use as an interior paint, it contains other inorganic components in addition to lighting, and there is a problem that it is not suitable for coating the surface of plastic or metal materials used in lighting fixtures.

Republic of Korea Patent Registration No. 10-1064761 Republic of Korea Patent Publication No. 10-2003-0032733 Republic of Korea Patent Publication No. 10-1999-0006999 Republic of Korea Patent Publication No. 10-2000-0036591 Republic of Korea Patent Registration No. 10-0605004 Republic of Korea Patent Registration No. 10-0853475

The present invention has been made in view of the problems of the prior art as described above, and an object of the present invention is to provide a coating composition configured to easily form a coating layer on the surface of a lighting device while including an illite.

In addition, it is an object of the present invention to provide a coating composition having improved effects such as deodorization and sterilization by decomposing harmful components generated in lighting fixtures.

The manufacturing method of the coating composition for lighting fixtures of the present invention for achieving the above object includes mixing a binder resin and surface-treated illite powder, wherein the surface-treated illite powder is acidified with illite powder. It is characterized in that it is prepared by immersing in an aqueous solution, washing and drying the illite powder, pulverizing the illite powder, and classifying the illite powder.

At this time, the step of pulverizing the illite powder may be pulverizing for 30 minutes to 1 hour at a rotational speed of 200 to 500 rpm.

In addition, 50 to 60 parts by weight of the illite powder may be mixed with 20 to 40 parts by weight of the binder resin.

In addition, in the step of mixing the binder resin and the surface-treated illite powder, an alkoxy silane, a surfactant, and a solvent may be additionally mixed.

In addition, the method for forming a coating layer of the present invention is characterized by coating the surface of the lighting device with the coating composition for lighting devices.

The coating composition according to the present invention exhibits an effect of facilitating the formation of a coating layer on the surface of a lighting device while including an illuminator.

In addition, since the coating layer formed by the coating composition includes illite, harmful components can be decomposed to exhibit effects such as deodorization and sterilization.

1 is an exemplary view of a pulverizer for pulverizing illite powder.

Hereinafter, the present invention will be described in more detail. Terms or words used in this specification and claims should not be construed as being limited to ordinary or dictionary meanings, and the inventor may appropriately define the concept of terms in order to explain his or her invention in the best way. It should be interpreted as a meaning and concept consistent with the technical idea of the present invention based on the principle that there is.

The coating composition for a lighting device according to the present invention is applied to a body of a lighting device, in particular, an LED lighting device to form a coating layer, to remove contaminants that may occur around a light source, and in particular, to obtain antibacterial and deodorizing performance. coating composition used. The coating composition of the present invention includes a binder resin and illite powder.

The coating composition of the present invention is particularly suitable for use in coating the surface of a lighting fixture where light from a light source does not reach. That is, by forming a coating layer using the coating composition of the present invention on the corner, side, or back surface where photocatalytic activity cannot be expected because light does not reach in a lighting fixture such as a photocatalytic LED module developed by the applicant, antibacterial and deodorizing performance is provided. It can increase the air purification effect of lighting fixtures. In addition, a coating layer may be formed using the coating composition of the present invention instead of the existing photocatalyst coating on a portion of the light source that is exposed to light.

The method for preparing the coating composition includes mixing the binder resin and surface-treated illite powder.

The illite powder is a ceramic powder having antibacterial and deodorizing effects and is known to exhibit effects such as deodorization, antifungal, and far-infrared emission by being used as a component of paint for building finishing materials. Unlike photocatalysts, these illite powders do not show activity by light irradiated from a light source, but can effectively block organic compounds, bacteria, and dust that cause odors by heat sources around the light source.

Since the coating composition including the illite powder has a binder resin and illite powder as main components, organic compounds may be adsorbed and decomposed on the surface of illite particles exposed to the surface after forming the coating layer. Therefore, there is a problem in that sufficient antibacterial and deodorizing effects cannot be obtained when using commonly used illite powder.

Therefore, in the present invention, surface-treated illite powder is used, and the surface-treated illite powder includes immersing the illite powder in an acid aqueous solution, washing and drying the illite powder, and pulverizing the illite powder. It may be prepared including the step of classifying the illite powder. In addition, illite powder having a particle size of 1 to 5 μm is selected and used through a classification step.

It is known that when illite has a frayed edge, it has an effect of selectively absorbing certain alkali metal ions (Journal of the Korean Mineral Society 17(3), 2004). These research results suggest that the adsorption properties are improved when the illite surface is weathered. surface treatment to remove it.

Referring to these existing research results, in the present invention, the illite powder is immersed in an aqueous acid solution to remove a certain amount of potassium ions, and then pulverized and classified to select surface-treated illite powder having a size of 1 to 5 μm and to form a coating composition. It is used as a component of

The sorting size of the illite powder is selected in order to obtain a coating film property suitable for performing the process of forming a coating layer in a narrow area of a lighting fixture. If the illite powder is too small, the workability of the coating operation deteriorates It was found that coating defects are likely to occur, and if it is too large, the surface area of the illite is reduced, so that sufficient antibacterial and deodorizing effects cannot be obtained.

It is preferable to use any one weak acid of acetic acid and oxalic acid as the aqueous acid solution, and the concentration of the aqueous acid solution is preferably 0.5 to 1M. If the acid concentration is too low, it takes too much time to remove potassium, resulting in a decrease in productivity and economy. In the grinding process, it was found that it was difficult to control the particle size and the interlayer structure was destroyed, resulting in a decrease in activity. This is derived from the following experimental results.

Illite powder with an average particle size of about 100 μm obtained from Yeongdong-gun was immersed in an aqueous acid solution, and the potassium ion content (ppm) in the aqueous solution according to the immersion time was measured with a mass spectrometer. The results are shown in Table 1.

0.5 hours 1 hours 5 hours 10 hours 1M oxalic acid 1.8 2.0 2.2 2.3 0.1 M oxalic acid 0.8 0.8 0.9 0.9 1M acetic acid 2.1 2.3 2.4 2.4 0.1 M acetic acid 0.7 0.8 0.8 0.9 0.5M hydrochloric acid 5.4 5.8 6.2 6.6 0.1M hydrochloric acid 3.2 3.4 3.8 4.2 0.5M nitric acid 4.8 5.5 5.8 6.0 0.1M nitric acid 3.0 3.3 3.9 4.0

In addition, the results of obtaining the degree of interlayer expansion of the illite powder under each condition as the intensity ratio of the XRD peaks of the 001 and 003 planes are shown in Table 2. The Gingdo ratio is calculated by dividing the value of I(001)/I(003) of the sample before expansion and the sample after expansion. The closer to 1, the less smectite layer generated by the interlayer expansion. If it has a value, it means that a smectite layer has occurred. In addition, as the interlayer expansion increases, the degree of occurrence of defects due to micronization of the particles and destruction of the crystal structure during the grinding process may increase. The intensity ratio calculated for each sample is shown in Table 2.

before immersion 0.5 hours 10 hours 1M oxalic acid 1.22 1.20 1.21 0.1M oxalic acid 1.22 1.23 1.18 1M acetic acid 1.22 1.20 1.24 0.1 M acetic acid 1.22 1.18 1.21 0.5M hydrochloric acid 1.22 1.39 1.41 0.1M hydrochloric acid 1.22 1.42 1.45 0.5M nitric acid 1.22 1.36 1.38 0.1M nitric acid 1.22 1.43 1.48

Summarizing the results of Tables 1 and 2, in the case of the illite powder immersed in 1M oxalic acid or acetic acid, it was found that the potassium ion content in the solution gradually increased over time, but the interlayer expansion did not occur significantly. However, in the strong acid solution, the potassium ion content increased significantly, and the interlayer expansion also increased accordingly. In addition, in 0.1 M oxalic acid or acetic acid, interlayer expansion did not occur according to the immersion time, and it was found to be stable, but the potassium ion content in the aqueous solution was not significantly increased.

In addition, it was shown that the crystal structure of illite after immersion in the aqueous acid solution was destroyed by pulverization, and if the pulverization conditions were too harsh, the physical properties of the obtained illite powder rather deteriorated. Therefore, it is preferable to carry out the grinding process using an improved grinding machine for grinding illite powder.

That is, the immersion treated illite powder is recovered, washed and dried, and then pulverized using a grinder. As a grinder used in the pulverization process, general coarse or planetary wheat can be used, but under too strong pulverization conditions, the crystallization of illite It is preferable to use a low-speed mill as shown in FIG. 1 because the structure is broken. When the low-speed grinder inputs the illite powder through the inlet 10, it is radially connected to the rotatable post 20 installed inside the grinder housing, and two or more grinding rods 30 having grinding heads 31 at the other ends are While being rotated by the rotary driving means 40, the illite powder is pulverized. The grinding head 31 has a cylindrical shape, and a plurality of hemispherical grinding protrusions 32 are formed along the outer wall and the outer circumferential surface of the end. Therefore, the rotation of the grinding head 31 causes the grinding head 31 equipped with the grinding protrusions 32 to collide with the illite powder, thereby reducing the destruction of the crystal structure and pulverizing the powder. In addition, the inlet 10 and the outlet 50 are configured to be openable, so that they are closed until the raw material is introduced and the pulverization process is finished, but can be opened only when the raw material is input or discharged. In addition, when the grinding process is performed using the grinder, it is preferable that the grinding is performed at a relatively low rotation speed of 200 to 500 rpm. In addition, it was found that grinding for 30 minutes to 1 hour at such a low speed condition can reduce the particle size while reducing the crystal structure destruction.

In particular, the crushing head 31 and the crushing protrusion 32 are preferably made of silicone rubber material, but when a metal material is used, too strong impact may be applied and severe destruction of the crystal structure may occur. It is desirable to configure In addition, since the grinding protrusion 32 has relatively higher elasticity than the grinding head 31, it was found to be effective in crushing and pulverizing the lumpy powder.

The illite powder obtained through the pulverization process in this way is classified using a conventional centrifugal classifier to select illite powder having a desired particle size.

In addition, as the binder resin used in the coating composition of the present invention, any resin used in conventional coating compositions may be used, and it is preferable to use any one of an epoxy resin, an acrylic resin, and a urethane resin.

The coating composition is preferably mixed with 50 to 60 parts by weight of illite powder based on 20 to 40 parts by weight of the binder resin. If the content of the binder resin is too small, the coating layer is not formed smoothly, and if the content of the binder resin is too large, the surface area of illite powder exposed to the surface of the coating layer is relatively reduced, resulting in insufficient antibacterial and deodorizing performance. .

In addition, in order to apply the coating composition of the present invention to the surface of the lighting device, a dip coating method, a spray coating method, or a powder coating method may be applied. At this time, it is necessary to form a liquid coating composition for dip coating or spray coating. In this case, the coating composition preferably further includes an alkoxy silane, a surfactant, and a solvent.

Since the alkoxy silane forms a network structure by hydrolysis and polycondensation after forming the coating layer, durability of the coating layer can be improved when forming a coating film with a liquid coating composition. However, since the network structure formed from the alkoxy silane is affected by the amount of the solvent contained in the coating composition or mixing conditions, it is preferable to add a surfactant to control it. As the alkoxy silane, it is preferable to use tetraethylorthosilicate (TEOS) or tetramethylorthosilicate (TMOS).

As the surfactant, commonly used cationic, anionic, or nonionic surfactants may be used, and it has been found that it is preferable to use surfactants in the form of nonionic block copolymers. In one embodiment, polystyrene-b-polymethylmethacrylate was used as a surfactant, and since this block copolymer can form a microstructure by arranging a hydrophilic part and a hydrophobic part in a solution, the dispersibility of illite powder can improve

In addition, the solvent is preferably a mixed solvent of alcohol and water to disperse the alkoxy silane and the surfactant and to cause hydrolysis and polycondensation. Considering the hydrolysis and polycondensation of alkoxysilanes, it is preferable to use the mixed solvent by mixing an alcohol selected from ethanol or isopropanol and water in a weight ratio of 8:2 to 9:1.

A test evaluation was conducted as follows to see if the coating composition of the present invention could be applied to the surface of a lighting fixture to obtain the desired effect.

Bisphenol A was used as the binder resin, and 2 parts by weight of diethylenetriamine as a curing agent was mixed with respect to 100 parts by weight of the binder resin.

Illite powder was immersed in 1M oxalic acid for 1 hour, washed, pulverized, and classified to select particles having an average particle size of 2 μm (Illite 1). In addition, illite powder without surface treatment was also used for comparison (illite 2).

Polystyrene-b-polymethyl methacrylate having a number average molecular weight (Mn) of 30,700 was used as the surfactant, and an alcohol-based mixed solvent obtained by mixing isopropanol and water in a weight ratio of 9:1 was used as the solvent.

The coating composition was prepared with the composition shown in Table 3. In Table 3, units are parts by weight.

binder resin illite 1 illite 2 alkoxysilane Surfactants menstruum Example 1 30 52 Example 2 25 55 Example 3 30 52 10 3 65 Example 4 25 55 10 3 65 Comparative Example 1 25 52 Comparative Example 2 25 52 10 3 65

The coating composition formed according to Table 3 was coated to a thickness of about 500 μm on the head of the LED lighting fixture for street lighting produced by the applicant to form a coating layer. The coating compositions of Examples 1 and 2 and Comparative Example 1 were coated using an electrostatic spray method, and the coating compositions of Examples 3 and 4 and Comparative Example 2 were coated using a spray coating method. As a result of measuring the durability of the coating layer, it was confirmed that the durability of the formed coating layer was excellent since the pencil hardness of the samples of Examples and Comparative Examples all showed 6H.

In addition, in order to evaluate the antibacterial and deodorizing performance of the coating layer, a specimen in which a 300 μm thick coating layer was formed on a 10 × 10 cm 2 aluminum alloy was prepared, and the specimen was placed on a solid medium and the bacteria were evenly sprayed. After 4 weeks, the bacteria Growth was measured. The antibacterial test was in accordance with KS K 0693-2001, and the strains used were Staphylococcus aureus ATCC 6538, Klebsiella pneumoniae ATCC 4352, and Escherichia coli KCTC 1682, which were cultured at 37℃ for 24 hours. Bacteria were used as inoculum. As a result, it was confirmed that the growth of bacteria was inhibited by 99.9% in Examples 1 to 4 and Comparative Examples 1 to 2. This is thought to be due to the antibacterial effect of illite.

In addition, in order to evaluate the deodorizing performance, the deodorizing power for formaldehyde, ammonia and VOC (toluene) was measured using the gas detection tube method. 5 μl of 28% ammonia water was added to the container containing the reference and specimen (same specimen as for the antibacterial test), and the container was heated to vaporize the ammonia water. After 120 minutes, the concentration (Cb) of the reference container and the sample containing the sample The ratio to the concentration (Cs) of the container was obtained by the formula for obtaining the deodorization rate (deodorization rate (%) = (Cb-Cs) / Cb × 100).

In addition, in order to confirm whether the deodorizing effect is maintained, the deodorization rate was measured by the gas detection tube method, the specimen was cleaned, and the same experiment was repeated twice more. The results are shown in Table 4.

1 deodorization rate (%) Deodorization rate twice (%) 3 times deodorization rate (%) Example 1 85.8 84.7 84.2 Example 2 84.6 84.1 83.8 Example 3 84.7 84.4 84.0 Example 4 85.2 84.7 84.3 Comparative Example 1 66.8 44.8 25.5 Comparative Example 2 75.4 52.6 28.4

As a result of the test of the deodorizing effect, the deodorizing rate in Examples 1 to 4 was higher than that of Comparative Examples 1 and 2, and in particular, when the deodorizing test was repeated, the deodorizing rate was not significantly reduced, so when using general illite powder It was confirmed that the deodorization performance was improved compared to the

Although the present invention has been described with preferred embodiments as described above, it is not limited to the above embodiments, and various modifications and modifications can be made by those skilled in the art within the scope of not departing from the spirit of the present invention. Change is possible. Such modifications and variations are intended to fall within the scope of this invention and the appended claims.

10: inlet
20: post
30: crushing rod
31: grinding head
32: grinding protrusion
40: rotation drive means
50: outlet

Claims (5)

A method for producing a coating composition for lighting fixtures comprising mixing a binder resin and surface-treated illite powder,
The surface-treated illite powder,
immersing illite powder in an aqueous solution of 0.5 to 1 M acetic acid or oxalic acid;
washing and drying the illite powder;
Grinding the illite powder;
classifying the illite powder;
Method for producing a coating composition for lighting equipment, characterized in that produced by including.
The method of claim 1,
The step of pulverizing the illite powder is a method for producing a coating composition for lighting fixtures, characterized in that the pulverization for 30 minutes to 1 hour at a rotational speed of 200 to 500 rpm.
The method of claim 1,
Method for producing a coating composition for a lighting fixture, characterized in that mixing 50 to 60 parts by weight of the illite powder with respect to 20 to 40 parts by weight of the binder resin.
The method of claim 1,
A method for producing a coating composition for lighting fixtures, characterized in that in the step of mixing the binder resin and the surface-treated illite powder, an alkoxy silane, a surfactant and a solvent are additionally mixed.
A method of forming a coating layer, characterized in that the coating composition for lighting devices prepared according to the manufacturing method of claim 1 is coated on the surface of the lighting device.

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