KR101211168B1 - Coating materials to intercept the ultravioleta lay and coating method for lamp - Google Patents

Abstract

PURPOSE: A coating composition on ultraviolet A protection and a lamp coating method thereof are provided to block the ultraviolet ray by coating the lamp with the mixture of glass powder and binder. CONSTITUTION: A glass material essentially includes the fundamental component of glass-Bi2O3, ZnO, B2O3. A glass material becomes to powder by grinding it. A paste is produced by mixing glass powder with binder. The paste is coated to the lamp. The lamp becomes plasticity at 500-700°C. [Reference numerals] (AA) Glass manufacturing step; (BB) Glass pulverizing step; (CC) Paste making step; (DD) Applying step; (EE) Plasticizing step

Description

 Coating composition for UVA blocking and lamp coating method using the same {Coating Materials To Intercept The UltravioletA Lay And Coating Method for Lamp}

 The present invention relates to an inorganic coating composition capable of blocking UV A, and more particularly, to a UV A coating composition for stably coating a lamp used at a high temperature and a lamp coating method using the same.

Among the various types of light generated by lamps, the ultraviolet light includes ultraviolet rays A, B, and C.

Among them, the technology for removing the ultraviolet rays B and C is already developed, whereas the ultraviolet rays A has a technical difficulty in selectively absorbing only the ultraviolet rays A including the wavelength region adjacent to the violet color of visible light at 320-380 nm. have.

In addition to causing various human diseases such as dermatitis, macular degeneration, cataracts, and the like, in the industrial field, UVA is sensitive to the wavelength band around 352nm and caused by the photosensitive insects. ) There was difficulty in causing damage.

Currently, researches are actively being conducted in various countries around the world, and various commercial products are available for UVA blocking materials. However, the developed UV blocking paints are mostly polymer materials, so the high-temperature region of the lamp that emits light is about 150 ~ 400. ℃) has a problem that can not be applied.

The present invention has been made to solve the above problems, can withstand the high temperature of 150 ~ 400 ℃ of industrial lamps and can block all or more than 90% of the UVA and is also widely used as a conventional UV blocking glass It is an object of the present invention to provide a coating composition for UVA blocking, which is an environmentally friendly coating material that does not use Pb, and a lamp coating method using the same.

In addition, the present invention is a type of coating a glass on a lamp used as a base to overcome the compositional limitations of conventional chemical coating methods such as sol-gel to solve the non-uniformity of the coating, excellent light transmittance and minimized thermal deformation It is an object of the present invention to provide a coating composition for blocking and a lamp coating method using the same.

In order to achieve the above object, the lamp coating method using the coating composition for UVA blocking of the present invention includes the essential components of glass of Bi ₂ O ₃ , ZnO, B ₂ O ₃ , and CeO ₂ , which is optionally included. _And a glass material manufacturing step of manufacturing a glass material comprising a selected ingredient of at least one glass selected from Sb ₂ O _{3 and} V ₂ O ₅ , and a glass powder step of pulverizing the glass material into a powder state. And a paste manufacturing step of mixing paste with the glass powder to make a paste, and a firing step of applying the paste to a lamp and firing the lamp passed through the coating step at 500 to 700 ° C.

And the basic component of the glass in the glass manufacturing step is Bi ₂ O ₃ 25 to 60% by weight, 5 to 35% by weight of ZnO, and 10 to 40% by weight of B ₂ O ₃ , wherein the optional component is CeO ₂ based on 100 parts by weight of the base component of the glass. 0.2-1.5 parts by weight, Sb ₂ O ₃ 0.5 to 1.5 parts by weight, V ₂ O ₅ It is preferable that 1 or more types are chosen among 0.5-5 weight part.

In the paste manufacturing step, the binder is preferably prepared by stirring α-Terpineol and ethyl cellulose in a weight ratio of 5: 0.1 to 0.4 for 2-3 hours.

In the paste manufacturing step, the glass powder and the binder are preferably mixed in a weight ratio of 15: 5.0 to 5.3.

And in order to achieve the above object, the coating composition for UV-A blocking of the present invention is essential components of the glass of Bi ₂ O ₃ , ZnO, B ₂ O ₃ are included, and optionally included CeO _{2 ,} Sb ₂ O _{3 ,} V ₂ O _{5 It} contains a glass material containing a selection component of at least one glass selected from, characterized in that the glass material is made of a powder state.

And the basic component of the glass is Bi ₂ O ₃ 25 to 60% by weight, 5 to 35% by weight of ZnO, and 10 to 40% by weight of B ₂ O ₃ , wherein the optional component is CeO ₂ based on 100 parts by weight of the base component of the glass. 0.2-1.5 parts by weight, Sb ₂ O ₃ 0.5 to 1.5 parts by weight, V ₂ O ₅ It is preferable that 1 or more types are chosen among 0.5-5 weight part.

According to the present invention having the above-described configuration, the following effects can be expected.

First of all, the present invention can be applied to general building exterior materials, tea glasses, glasses, and the like that block ultraviolet rays. In particular, the present invention can be exported to Australia, New Zealand, etc., which are exposed to a lot of ultraviolet rays, and can prevent damage caused by ultraviolet rays.

And the present invention has an effect that can be used semi-permanently by solving the non-uniformity of the coating, excellent light transmittance and minimize thermal deformation

In addition, by preventing access to ultraviolet daylight insects, such as moths, it is possible to reduce the damage caused by product contamination in the production sites, such as food industry and paper industry.

Finally, the present invention has the effect of preventing the decline of vision and various skin diseases and the fading of various articles to extend the life of the product as well as the health aspects.

1 is a flow chart showing a lamp coating method using the UVA blocking composition of the present invention.
Figure 2 is a UV visible spectrophtometer measurement graph for determining the UV cut off region, according to a preferred embodiment of the present invention.
Figure 3 is a graph taken by a high temperature microscope after making a pellet with a glass composition of the Frit state in order to determine the thermal durability, according to a preferred embodiment of the present invention.
Figure 4 (a) is a high-temperature micrograph taken a specific temperature Pellet state of the existing glass component, Figure 4 (b) is a Pellet state of the glass component according to an embodiment of the present invention (composition 3) at a specific temperature High temperature micrograph taken.
Figure 5 is a graph showing the degree of blocking of UVA according to the coating thickness, according to a preferred embodiment of the present invention.
Figure 6 (a) is a photograph showing when coated with a glass component according to an embodiment (composition 3) of the present invention, Figure 6 (b) shows when coated with a glass component according to a comparative example (composition 5). Picture.
Figure 7 is a photograph showing the transmittance of visible light according to the coating thickness of the coating composition for UVA blocking according to the embodiment (composition 3).
8 is a graph showing an integrating sphere test according to a preferred embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

First, Figure 1 is a flow chart showing a lamp coating method using a coating composition for UVA blocking according to a preferred embodiment of the present invention.

As shown, the present invention includes a glass material manufacturing step, a glass powder step, a paste manufacturing step, an application step, and a firing step.

First, the glass material manufacturing step will be described.

The glass material manufacturing step is a basic component of the glass of Bi ₂ O ₃ , ZnO, B ₂ O ₃ , which is essentially included, and optionally one or more selected from CeO _{2 ,} Sb ₂ O _{3 ,} V ₂ O ₅ It is the step of manufacturing the glass material which consists of a selective component of glass.

According to a preferred embodiment, the basic component of the glass is Bi ₂ O ₃ 25 to 60% by weight, 5 to 35% by weight of ZnO, and 10 to 40% by weight of B ₂ O ₃ , wherein the optional component is CeO ₂ based on 100 parts by weight of the base component of the glass. 0.2-1.5 parts by weight, Sb ₂ O ₃ 0.5 to 1.5 parts by weight, V ₂ O ₅ It is preferable that 1 or more types are chosen among 0.5-5 weight part.

In more detail, when the Bi ₂ O ₃ ratio is less than 25% by weight, it is difficult to lower the melting point of the glass. When the Bi ₂ O ₃ ratio exceeds 60% by weight, the coefficient of thermal expansion is increased and the absorption of the glass powder is increased, which may result in deterioration of initial characteristics.

The ZnO is an organic compound that blocks the ultraviolet B is less than 5% by weight of the ultraviolet light blocking ability, when it exceeds 35% by weight is difficult to vitrify.

The B ₂ O ₃ ratio is preferably 10 to 40% by weight, and less than 10% by weight of glass is difficult to form, and when it exceeds 40% by weight, glass crystallization becomes difficult and the melting point of the glass becomes high.

CeO ₂ Silver is a UV blocking material, when the ratio is lower than 1.5% by weight, the ability to block UV rays is reduced.

The Sb ₂ O ₃ is preferably 0 to 1.5% by weight, when the ratio is more than 1.5% by weight lowers the coefficient of thermal expansion of the glass, while containing a large amount of glass is difficult to form.

The V ₂ O ₅ should not exceed 5% by weight because the glass discolors excessively in the visible region when it exceeds 5% by weight.

Next is the glass powder stage.

The glass powder step is to crush the glass material to a powder (Frit) state.

The reason for making the glass in a powder (Frit) state is to form a uniform coating by coating the glass in a wide spread state in the coating step to be described later.

At this time, the particle size of the glass powder is most preferably about 40 ~ 50㎛ to form a uniform coating.

The paste manufacturing step will be described.

The paste manufacturing step is a step of making a paste by mixing a binder with the glass powder.

At this time, the binder is prepared by stirring for 2 to 3 hours at α-Terpineol and ethyl cellulose 5: 0.1 to 0.4 weight ratio, the binding function as a binder is maximized.

In addition, the binder thus prepared is a glass powder: binder = 15: 5.0 to 5.3 by weight ratio to make a paste to increase the adhesion between the composition and become the most suitable viscosity for coating.

Next will be described the application step.

The applying step is a step of applying the paste to the lamp.

Preferably, the paste is preferably applied to the surface of the lamp to a thickness of 30㎛ or more through various coating methods such as Dip Coating, Spin Coating, Spray Coating.

Next, the firing step will be described.

The firing step is a step of firing the lamp passed through the coating step at 500 ~ 700 ℃.

At this time, the firing temperature is less than 500 ℃ 500 ~ 700 ℃ is preferable because the driving force for firing is too weak and exceeding 700 ℃ can be unreasonable to the lamp glass.

Hereinafter, preferred embodiments of the present invention will be described in detail.

Table 1 below shows the proportions of the compositions used to make the glass of the present invention.

Bi ₂ O ₃ ZnO B ₂ O ₃ CeO ₂ Sb ₂ O ₃ V ₂ O ₅ room
city
Yes Composition 1 28 11.5 60 0.5 Composition 2 28 11.5 60 0.5 Composition 3 49.7 9.8 39.7 0.8 Composition 4 49.7 9.8 38.7 0.8 One Comparative example Composition 5 50 10 40

The UV-blocking coating composition prepared based on the glass thus prepared was applied to the lamp to examine the UV-blocking effect.

The compositions of 1 and 2 showed a slight increase in the UV blocking ability, but even a slight increase in thickness showed a sharp opacity.

This is because the amount of Bi2O3 that contributes the most to lowering the UV blocking mechanism and the overall melting point is low.

If the overall melting point is high, the viscosity becomes relatively high at the firing temperature, and if it is cooled in the furnace in this state, it is considered that an opaque ceramic is formed because the cooling rate does not reach the critical cooling rate at which glass is formed.

On the other hand, the compositions of 3 and 4 were made based on the comparative example (composition 5) and can be compensated by the addition of Sb2O3, which has a slightly insufficient light transmittance to the composition 5.

It is believed that Sb2O3 acts as a colorant to increase light transmittance.

In the case of composition 4, additional V2O5 was added. Usually, V2O5 is an additive used to form low temperature glass. Referring to FIG. 3, the peak of composition 4 (g10 + @) shifted slightly to the left rather than composition 3 (g10). can see.

This is because a small reduction in the firing temperature in manufacturing the material is directly related to the cost, and it can be seen that intentionally adding V2O5 can reduce the temperature as needed.

Next, look at the characteristics of the coating composition for UVA blocking prepared on the basis of the embodiment.

(UV A Block)

FIG. 2 is a graph showing a UV blocking region of glass after heat treatment after applying a paste prepared by using composition 3 as a glass component to a slide glass having UV blocking effect in the vicinity of 300 nm.

As can be seen in the present invention, it can be seen that it has a cut off region of about 373 (± 2) nm, through which the daylight sensitized by reacting sensitively to the wavelength range around the ultraviolet light A (320-380 nm) in the industrial field. It can be seen that insects can be blocked.

(Thermal durability)

3 is a graph showing a high temperature microscope after making pellets with glass components (composition 3 and composition 4) in a Frit (powder) state to determine thermal durability.

Here, the X-axis plots the temperature and the Y-axis plots the Y / X (length ratio) of the pellet, g10 (composition 3), and g10 + @ (composition 4) shows stability without thermal deformation to 400 ° C. Able to know.

In addition, g10 + @ (composition 4) to which 1 mol% of V2O5 was added to g10 (composition 3) did not have a large deformation to 500 ° C or more, and when V2O5 was added through the addition of the peak of composition 4 slightly to the left, the firing temperature You can see that it can be slightly lowered.

(Coating uniformity)

Figure 4 (a) is a photograph taken of a conventional Pellet state of the glass component at a specific temperature and Figure 4 (b) is a high temperature micrograph taken a Pellet state of the glass component according to an embodiment of the present invention (composition 3) at a specific temperature It is a photograph.

As can be seen, in the case of the conventional glass component (a) ceramicization proceeds and hardens to a droplet state, but in the case of the glass component according to the embodiment of the present invention (b) it can be seen that the coating is thin.

 That is, when firing by pelleting the existing glass component is opaque and round like a Go egg, it can be seen that the glass component of the present invention is spread widely and transparently applied.

(UV protection degree according to coating thickness)

5 is a graph showing the degree of UV protection according to the coating thickness of the coating composition for UVA blocking according to the embodiment (composition 3).

 1, 2, 3, 4, 5 (No. 1: 10 μm, No. 2: 20 μm, No. 3: 30 μm, No. 4: 40 μm, No. 5: 50 μm) of FIG. It can be seen that the UVA blocking effect increases as it increases.

In other words, since the UVA blocking effect is weak when the coating thickness is thin, coating with a thickness of 30 μm or more seems to be appropriate.

(Coating transparency)

Figure 6 is a photograph for determining the coating transparency of the coating composition for blocking UVA.

First, Figure 6 (a) is when the coating with a glass component according to the embodiment (composition 3), Figure 6 (b) shows when the coating with a glass component according to the comparative example (composition 5).

Unlike composition 5, composition 3 was tested by adding Sb 2 O 3, and composition 5 without Sb 2 O 3 was completely opaque, and composition 3 with more Sb 2 O 3 was completely transparent.

(Visible light transmittance)

Figure 7 is a photograph showing the transmittance of visible light according to the coating thickness of the coating composition for UVA blocking according to the embodiment (composition 3).

As can be seen from the photographs corresponding to I, II, III, and IV (I: 10 μm, II: 20 μm, III: 30 μm, and IV: 40 μm) of FIG. .

(Integral sphere test)

8 shows a graph of the integrating sphere test. (bulb is pure lamp without coating, coating is coated on the lamp)

The integrating sphere test is a test for measuring the intensity of light in each wavelength band by adding all the intensities of the wavelengths reaching the surface of the sphere after putting the lamp in a large sphere.

The black line in the graph is a graph when the lamp is not coated, and the red line is a graph showing the coating after the lamp.

As you can see, when the lamp is coated, almost all light is blocked or only a small amount of ultraviolet light is detected at 400 nm or less.

In addition, it can be seen that in the visible light region, the amount of light intensity is reduced or even increased.

This is because the energy of ultraviolet light absorbs a large amount of light and emits a low energy visible light region, and thus, the intensity of visible light is higher in some regions.

On the contrary, when the lamp is not coated, almost all light of 400 nm or less is transmitted and a large amount of ultraviolet rays are detected.

As described above, the present invention provides a coating composition for UVA blocking and a lamp coating method using the same that can withstand high temperatures of 150 to 400 ° C. of an industrial lamp and block all or 90% or more of UVA. It can be seen that the idea, and in this way, within the scope of the basic idea of the present invention, many other modifications are possible to those of ordinary skill in the art.

Claims (6)

Including the essential components of the glass of essential Bi ₂ O ₃ , ZnO, B ₂ O ₃ and optionally selected one or more glass selected from CeO _{2 ,} Sb ₂ O _{3 ,} V ₂ O ₅ Glass material manufacturing step of producing a glass material made;
A glass powder step of pulverizing the glass material into a powder state;
Paste manufacturing step of making a paste (paste) by mixing the binder in the glass powder;
An application step of applying the paste to a lamp; And
A firing step of firing the lamp passed through the coating step at 500˜700 ° C .;
Lamp coating method using a coating composition for UVA blocking comprising a. The method of claim 1,
In the glass material manufacturing step, the basic component of the glass is composed of a composition ratio of Bi ₂ O ₃ 25 to 60% by weight, ZnO 5 to 35% by weight, B ₂ O ₃ 10 to 40% by weight,
The optional component is characterized in that at least one selected from 0.2 to 1.5 parts by weight of CeO ₂ , 0.5 to 1.5 parts by weight of Sb ₂ O _{3, and} 0.5 to 5 parts by weight of V ₂ O ₅ with respect to 100 parts by weight of the base component of the glass. Lamp coating method using a coating composition for UVA blocking. The method of claim 1,
In the paste manufacturing step, the binder is α-Terpineol and ethyl cellulose 5: A lamp coating method using a coating composition for UVA blocking, characterized in that the mixture is prepared by stirring for 2 to 3 hours in a weight ratio of 0.1 to 0.4. The method of claim 1,
The glass powder and the binder in the paste manufacturing step is a lamp coating method using a coating composition for UVA blocking, characterized in that the mixture in a weight ratio of 15: 5.0 ~ 5.3. Essential components of the glass of essential Bi ₂ O ₃ , ZnO, B ₂ O ₃ and optionally containing one or more of the optional components selected from CeO _{2 ,} Sb ₂ O _{3 ,} V ₂ O ₅ Containing a glass material, wherein the glass material is UVA coating composition for blocking, characterized in that the powder. The method of claim 5,
The basic component of the glass is Bi ₂ O ₃ It consists of a composition ratio of 25 to 60% by weight, 5 to 35% by weight of ZnO, 10 to 40% by weight of B ₂ O ₃ ,
The optional component is CeO ₂ based on 100 parts by weight of the basic component of the glass. 0.2-1.5 parts by weight, Sb ₂ O ₃ 0.5 to 1.5 parts by weight, V ₂ O ₅ UV-A coating composition for at least one selected from 0.5 to 5 parts by weight.

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