KR101277461B1 - Panel Coating Method - Google Patents

Abstract

The present invention relates to a panel coating method, and more particularly, to a method of antifouling coating a glass panel using a coating liquid containing a fluorine-based alkoxysilane compound or a method of antifouling coating an acrylic panel using an ultraviolet curing coating liquid. More specifically, the glass panel coating method according to the present invention, when the coating using the coating liquid containing the fluorine-based alkoxysilane compound, by performing a high temperature and high humidity treatment to enhance the bonding strength of the coating material and the panel to improve the durability of the antifouling coating In addition, it is a wet coating method that can improve the antifouling performance and the fingerprint resistance of the panel by performing a plasma treatment on the panel surface before the coating. In addition, the acrylic panel coating method according to the present invention, by adding a fluorine-based additive or a polysiloxane additive to the UV-curable coating liquid and coating and performing a plasma treatment on the surface of the panel before coating, it is possible to improve the bonding strength and durability of the coating material and the panel. In addition, it is a coating method that can improve antifouling performance and fingerprint resistance of the panel.

Description

Panel Coating Method

The present invention relates to a panel coating method, and more particularly, to a method for antifouling coating a glass panel using a coating liquid containing a fluorine-based alkoxy silane compound or a method for antifouling coating an acrylic panel using an ultraviolet curing coating liquid. More specifically, the glass panel coating method according to the present invention, when the coating using the coating solution containing the fluorine-based alkoxy silane compound, by performing a high temperature and high humidity treatment to enhance the bond strength of the coating material and the panel to improve the durability of the antifouling coating In addition, it is a wet coating method that can improve the antifouling performance and the fingerprint resistance of the panel by performing a plasma treatment on the panel surface before the coating. In addition, the acrylic panel coating method according to the present invention, by adding a fluorine-based additive or a polysiloxane additive to the UV-curable coating liquid and coating and performing a plasma treatment on the surface of the panel before coating, it is possible to improve the bonding strength and durability of the coating material and the panel. In addition, it is a coating method that can improve antifouling performance and fingerprint resistance of the panel.

The coated panel according to the present invention can be used in all devices having a display, and in particular, it can be applied to a display, a window of glass, tempered glass or acrylic, PET, etc. of a portable device such as a mobile phone and a PDA.

In general, in the case of a display panel, when foreign matter adheres to the surface of the panel or contamination by fingerprints affects the brightness, the usability decreases, and thus an antifouling coating is required.

In general, the antifouling coating of a panel is classified into a dry coating method for applying a solid or gaseous coating liquid using an electron beam and a wet coating method for applying a liquid coating liquid using a liquid coating liquid. .

However, the dry method has a disadvantage in that a small amount of production and expensive equipment are required as a batch method, and thus, a wet method having a low cost compared to the dry method is widely used because a large amount of production is required and expensive equipment is not required.

However, the wet method also has a problem of poor durability, such as wear resistance and chlorine resistance, which are not easy to be stained due to contamination or fingerprints on the surface, so that stain resistance and fingerprint resistance are not easily removed.

In order to solve the above problems, an object of the present invention is to use a coating solution containing a fluorine-based alkoxy silane compound in wet antifouling coating of glass panels and to perform high temperature and high humidity treatment to enhance the bonding strength between the coating material and the panel. It is to provide a panel coating method that can improve the durability of the antifouling coating.

It is also an object of the present invention to provide a panel coating method which can improve antifouling performance and fingerprint resistance by performing plasma treatment before coating using the coating solution.

Another object of the present invention is to add a fluorine-based additive or a polysiloxane additive to the UV-curable coating liquid during the coating of the acrylic panel and to perform a plasma treatment on the surface of the panel before coating, thereby enhancing the bonding strength and durability of the coating material and the panel. It is to provide a panel coating method that can improve the antifouling performance and fingerprint resistance of the panel.

The present invention provides an antifouling coating method for a glass panel using a coating liquid containing a fluorine-based alkoxy silane compound.

The present invention also provides an antifouling coating method for a glass panel, characterized in that the high temperature and high humidity treatment is performed at the time of coating using the coating solution containing the fluorine-based alkoxy silane compound.

The present invention also provides an antifouling coating method for a glass panel, wherein the plasma treatment is performed before coating using the coating solution containing the fluorine-based alkoxy silane compound.

In another aspect, the present invention provides an antifouling coating method of an acrylic panel, characterized in that using a UV-curable coating solution added with a fluorine-based additive or a polysiloxane-based additive.

In another aspect, the present invention provides an antifouling coating method of an acrylic panel, characterized in that the plasma treatment before the coating using the ultraviolet curable coating solution to which the fluorine-based additive or polysiloxane-based additive is added.

According to the wet coating method of the panel using the coating liquid of the present invention, it is possible to solve the problem of deterioration of durability, such as wear resistance and saline resistance, which are problems of the conventional wet coating method. That is, according to the coating method of the present invention, since the bonding strength between the coating material and the panel is excellent, the durability of the antifouling coating can be improved. In addition, according to the coating method of the present invention, it is possible to greatly improve the antifouling performance and fingerprint resistance of the panel by plasma treatment before coating.

1 is a cross-sectional view schematically showing a window formed of an antifouling coated tempered glass according to a preferred embodiment of the present invention.
2 is a structural diagram showing a bonding structure of a coating material and a glass surface according to the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Hereinafter, '%' used in the examples of the present invention means weight%.

The panel defined in the present invention includes all materials requiring antifouling coating, such as displays, windows, and cases of electronic devices such as glass, tempered glass, acrylic, and PET.

The first preferred embodiment of the invention is a coating method for glass panels and the second preferred embodiment is a coating method for acrylic panels.

First, as a first embodiment, a coating method for a window formed of tempered glass in a panel will be described in detail.

1 is a cross-sectional view schematically showing a window formed of an antifouling coated tempered glass according to a preferred embodiment of the present invention.

Referring to FIG. 1, the tempered glass window 10 according to the present invention may include an antifouling coating layer 130 on the upper surface of the glass 110 and a printing layer 120 on the rear surface of the window.

The window means a structure in which a display unit of a display area and an exterior panel area serving as a case other than the display area are integrally formed of a printed layer.

For convenience of description, the present embodiment will be described only for the window made of tempered glass in the panel, and an antifouling coating layer may be formed on the display surface from which the printing layer is removed as well as the window, and the coating layer is formed on the rear surface as well as the glass upper surface. It is obvious that this can be formed.

The print layer 120 may be formed on a portion other than the display area in the form of an icon, a pattern, a hairline, or the like to provide a texture or aesthetics of a metal material, and may be printed on the rear surface of the window by a conventional silk screen method. have.

The antifouling coating layer 130 may be formed by wet coating a coating liquid including a coating material composed of a fluorine-based alkoxy silane compound.

The fluorine-based alkoxy silane compound used as the coating material in the coating method of the present invention is a compound having a structure represented by the following formula (1).

....화학식(1)

.... Formula (1)

In said formula, R represents an organic functional group and R 'represents an alkoxy group.

The organic functional group is not particularly limited as long as it is a divalent organic group bonded to silicon and fluorine. For example, it may be an aliphatic or aromatic hydrocarbon group, and amine, epoxy, acrylic, vinyl, isocyanate or mercapto may be attached thereto.

The alkoxy group is not particularly limited, and may be, for example, a methoxy group, an ethoxy group, or a propoxy group which is an alkoxy group having 1 to 3 carbon atoms.

A coating liquid can be obtained by adding the fluorine-type alkoxy silane compound represented by the said Formula (1) used as a coating material of this invention to a suitable solvent. Examples of the solvent include aromatic hydrocarbons such as toluene, xylene and ethylbenzene, aliphatic hydrocarbons such as n-pentane, hexane and heptane, alicyclic hydrocarbons such as cyclohexane, chlorobenzene, dichlorobenzene, trichlorobenzene, hydrochlorofluorocarbon, Known solvents such as halogenated hydrocarbons such as hydrofluorocarbons and hydrofluoroethers can be used, but for example, hydrochlorofluorocarbons such as dichloropentafluoropropane, 1,1,1,2,2,3, 4,5,5,5-Decafluoropentane, 1,1,1,2,2,3,3,4,4,5,5,6,6-tridecafluorohexane, 1,1,1 , 3,3-pentafluorobutane, 1,1,1,2,2,3,3,4,4-nonafluorohexane, or 1,1,2,2,3,3,4-heptafluoro Hydrofluorocarbons such as locyclopentane, linear or branched nonafluorobutylmethyl ether, nonafluorobutylethyl ether, 1,1,2,2-tetrafluoroethyl-2,2,2-trifluoro To ethyl Such as le, difluoromethyl-2,2,3,3-tetrafluoropropylether, or 1,1,2,2-tetrafluoroethyl-2,2,3,3-tetrafluoropropylether Fluorine solvents, such as hydrofluoroether, are preferable. Among these fluorinated solvents, hydrofluorocarbon, ethyl nonafluoroisobutyl ether, or fluoropolyether is often used.

The fluoroalkoxy silane compound represented by the formula (1) is dissolved in a solvent to prepare a coating solution so that the solid content (active ingredient) is 0.1 to 0.5%. In the preparation of the coating solution, for example, by stirring at 500 rpm for 10 minutes with an impeller stirrer, dissolution to mixing of the solvent of the fluorine-based alkoxy silane compound can be promoted.

In addition, a coating solution may be prepared by further adding an additive which may improve fingerprinting, adhesion, and coating properties to the fluorine-based alkoxy silane compound and the solvent.

The antifouling coating layer 120 is formed by wet coating a coating solution containing the fluorine-based alkoxy silane compound represented by Chemical Formula (1) and a solvent on the surface of the glass 110.

As a method of coating the coating liquid on the glass surface, all known wet coating methods such as spin coating, spindle coating, spraying, dipping, and slit may be applied.

The coating liquid is applied to the glass surface by the above method and then dried to volatilize the solvent of the coating liquid, and high temperature and high humidity treatment is performed.

Specific high temperature and high humidity treatment will be described in detail in a coating method to be described later.

 By the high temperature and high humidity treatment, in the fluorine-based alkoxy silane compound represented by the formula (1) as a coating material, the alkoxy group (R ') is hydrolyzed by water to produce alcohol such as methanol, ethanol or propanol, and the hydroxyl group remains. The remaining hydroxyl groups are dehydrated and condensed with the OH groups on the glass surface, and the coating material is strongly bonded to the glass surface. The bonding structure between the coating material and the glass surface is shown in FIG. 2.

That is, the present invention uses a fluorine-based alkoxy silane compound represented by the formula (1) as a coating material to perform a high temperature and high humidity treatment during coating to promote hydrolysis and dehydration condensation of the coating material to be strongly bonded to the glass surface Since a mechanism is provided, the bonding strength of the fluorine-based alkoxy silane compound to the glass surface is enhanced, and the durability of the antifouling coating is greatly improved.

In addition, by coating the fluorine-based alkoxy silane compound represented by the formula (1) on the glass surface it is possible to improve the antifouling performance and fingerprint resistance by lowering the surface tension.

Hereinafter, a preferred coating method of the present embodiment will be described.

In this embodiment, in order to improve antifouling function and durability, a process of performing pretreatment on the upper surface on which the coating layer of the window is to be formed is important.

The pretreatment refers to a process of plasma treatment in a plasma cleaner after washing the glass surface using water, solvents and the like.

The plasma treatment is to remove contaminants present on the glass surface using atmospheric pressure plasma treatment, and chemical plasma treatment and physical plasma treatment may be used.

Chemical plasma treatment uses oxygen as a discharge gas to remove contaminants on the surface of a sample by reacting with active species present in the plasma. Oxygen atoms, ozone, and excitation particles that are broken in the plasma state react with the sample to form a gaseous state. Phosphorus is removed in the form of moisture and carbon dioxide, and fine surface roughness is formed through the surface modification effect.

In the physical plasma treatment, high energy ions collide with the surface of a sample to remove contaminants from the surface, and thus fine roughness is formed on the surface through a surface modification effect.

According to the removal of contaminants and the formation of fine roughness by the plasma treatment, not only the application of the coating liquid and the formation of the coating layer may be easily performed, but also the wear resistance and the salt spray resistance after coating may be greatly improved.

When the plasma pretreatment for the glass upper surface is completed as described above, the coating liquid containing a fluorine-based silane compound and a solvent is coated on the glass upper surface. Here, the coating solution may further include an additive which may improve anti-fingerprint properties, adhesion properties, and coating properties.

Here, the coating may be performed by all wet coating methods such as spin coating, spindle coating, spraying, dipping, slits, and the like.

Subsequently, the solvent of the coating liquid is volatilized and a drying process is performed to promote bonding between the coating component and the glass upper surface.

Here, the drying process may be a drying method such as IR drying, hot air drying.

Then, by inserting the coated glass window into the chamber and subjecting it to high temperature and high humidity, the hydrolysis and dehydration reaction of the coating material is activated to form a strong bonding structure between the coating material and the glass surface.

Here, the high temperature and high humidity treatment is preferably performed for 20 to 60 minutes under 60 to 90 ° C. temperature and 60 to 90% relative humidity conditions.

Hereinafter, the characteristics of the test and the test results for the panel coating method of the present embodiment will be described.

<Test evaluation method>

The total light transmittance (Tt) and haze were measured by JISK7105 using a haze meter (Nibbon Denshoku Kogyo, NDH 5000).

The contact angle was measured by a droplet method using a contact angle measuring instrument (Kruss, DSA100). The droplet method was carried out by dropping purified liquid droplets (diameter 2 mm) onto the coating surface and measuring the contact angle between the coated surface and purified water.

The abrasion test was performed by applying 500 g of an industrial eraser to a wear tester, placing it on a coated surface, and performing 1500 round trips (40 round trips / min, 20 mm width), and then measuring a contact angle on the worn surface.

The salt spray was performed after leaving for 72 hours in a 5% NaCl aqueous solution and 35 ° C. salt spray test, and then water was removed after washing, and the contact angle was measured after standing for 4 hours at room temperature.

Fingerprint protection is applied by pressing the inside of the thumb on the surface of the coated product to remove the fingerprint, and when placed on a black background to observe the degree of fingerprint attachment with the naked eye, the fingerprint is noticeable `` × '' and slightly visible △△ And a relatively inconspicuous thing were determined as "o".

The oil pen for writing evaluation was judged as `` ○ '' when the ink pen was not written well and when the ink of the letter was curled up when the graffiti was painted using an oil pen (name pen) on the surface of the coating.

The removal of the oil pen was judged as "○" if the surface of the coating was graffitied using an oil pen (name pen) and then wiped clean using the Kim Wiper.

<Characteristic evaluation before and after coating and by solid content of coating liquid>

The coating solution according to the present embodiment was added to a fluorine-based alkoxy silane compound (trade name Optool DSX (solid content 20%)) manufactured by Daikin Japan, and a fluorine-based solvent (NOVEC HEE-7200) manufactured by 3M company, and the solid content was 0.1 to 0.5. It was adjusted to% (solvent amount according to the solid content), and stirred for 10 minutes at 500 rpm with an impeller stirrer to prepare a coating solution.

The prepared coating solution was coated on a soda-lime glass (50mm × 50mm × 0.7T) at 250 rpm for 20 minutes using a spin coater. After coating, the coating solution was placed in a heat drying oven and dried at 120 ° C. for 30 minutes, followed by room temperature for 12 hours. After standing, the contact angle and reliability evaluation were performed, and the evaluation results are shown in Table 1 below.

Solid content
content
pure
Contact angle
Fingerprint
Preventive Handwriting evaluation
Transmittance
Hayes Oil pen
curling Oil pen
remove One Uncoated 20 degrees or less × × × 92.38 0.13 2 0.1% 112 degrees ○ ○ ○ 92.31 0.15 3 0.2% 114 degrees ○ ○ ○ 92.34 0.12 4 0.3% 115 degrees ○ ○ ○ 92.27 0.15 5 0.4% 114 degrees ○ ○ ○ 92.37 0.14 6 0.5% 115 degrees ○ ○ ○ 92.22 0.11

As can be seen from Table 1, there was no significant change in transmittance and haze according to before and after coating, but it can be seen that the contact angle was greatly increased by coating treatment with the coating solution according to the present invention. And it can be seen that the improvement in antifouling performance is significantly increased than when the coating treatment was not performed in the writing.

<Characteristic evaluation according to the number of times before and after atmospheric plasma treatment>

For evaluating the characteristics, atmospheric pressure plasma treatment according to a preferred embodiment of the present invention is a voltage 14 ~ 15kV, power frequency 15kHz, nitrogen (more than 99.9% purity) 3-10 lpm supply, oxygen (more than 99.9% purity) 10sccm supply, conveyor The speed was carried out under conditions of 10 mm / sec.

Then, the soda-lime glass (50mm × 50mm × 0.7T) was coated and dried by the coating method according to the present invention using the coating liquid (solid content 0.3%) after the atmospheric pressure plasma treatment, and the plasma treatment conditions were 0, 2, 4, The characteristics were evaluated during the 6 and 8 treatments, and the evaluation result characteristics are shown in Table 2 below.

plasma
Number of treatments Early
Pure contact angle After wear (1500)
Pure contact angle After salt spray
Pure contact angle One 0 115 92 101 2 2 116 104 111 3 4 117 106 113 4 6 115 105 111 5 8 115 105 110

As can be seen from Table 2, there is no difference in the initial contact angle before and after plasma treatment, but it can be seen that the wear resistance and the salt spray resistance are improved, and there is almost no difference in characteristics according to the increase in the number of treatments. Therefore, the plasma treatment is preferably performed 2 to 4 times.

<Characteristic evaluation by high temperature, high humidity treatment>

For this test, the high temperature and high humidity treatment was performed at a temperature of 80 ° C. and a relative humidity of 80%, and the present Example using soda-lime glass (50 mm × 50 mm × 0.7T) according to the present embodiment using a coating solution (0.3% solids). The coating and drying were carried out by the coating method according to the evaluation method, and the evaluation result characteristics are shown in Table 3 below.

Processing time Early
Pure contact angle After wear (1500)
Pure contact angle After salt spray
Pure contact angle One none 116 50 74 2 Leave at room temperature 12hr 115 92 107 3 10 min 114 96 108 4 20min 116 107 110 5 30min 115 105 109 6 40min 114 103 108 7 50min 115 106 108 8 60min 115 106 107

As can be seen from Table 3, there is no significant change in the initial characteristics before and after the high temperature and high humidity treatment and room temperature, but it can be seen that the wear resistance and the salt spraying characteristics are improved.

In addition, when the high temperature and high humidity treatment is 20 minutes or more, there is no big difference in characteristics, which indicates that the reaction of the coating solution is promoted by moisture rather than temperature.

On the other hand, even when left at room temperature, the reaction occurs by moisture in the air, but it takes a long time and the durability is low.

As a result, it can be confirmed that the high temperature and high humidity treatment can activate the hydrolysis and dehydration reaction of the coating material to form a strong bonding structure between the coating material and the glass surface, thereby improving anti-fingerprint and antifouling performance and improving durability. have.

Next, as a second embodiment of the present invention, a coating method for an acrylic panel will be described in detail.

The coating liquid provided for coating the acrylic panel is an ultraviolet curable coating liquid, and the ultraviolet curable coating liquid is wet-coated on the surface or the back of the acrylic panel, and dried to irradiate with ultraviolet rays to form an antifouling coating layer.

The said ultraviolet curable coating liquid consists of a curable polyfunctional monomer and / or oligomer, and a solvent. As a curable polyfunctional monomer or oligomer, an acryl monomer or oligomer, a urethane monomer or oligomer, an epoxy monomer or an oligomer, etc. can be illustrated, The said monomer and oligomer can be used in mixture of 2 or more types.

Preferably, as the curable polyfunctional monomer and / or oligomer, 3 to 20% of a 6-functional urethane acrylate oligomer (6-functional acrylate monomer) in a weight ratio, 6-functional acrylate monomer 1 It is preferable to include -20%, and 2-20% of a trifunctional acrylate monomer.

The UV curable coating solution contains 20 to 80% of a solvent based on the total content of the coating solution, and the solvent includes alcohols such as methanol, ethanol, isopropyl alcohol or n-propyl alcohol, acetone, methyl ethyl ketone or methyl isobutyl Ketones such as ketones, carbonates such as methyl carbonate or ethyl carbonate, propylene glycol monomethyl ether acetate (PGMEA), ethyl acetate, toluene, xylene and the like can be used.

The ultraviolet curable coating liquid further includes a photoinitiator in an amount of 2 to 8% relative to the solid content of the monomer or oligomer in order to polymerize and cure the curable polyfunctional monomer or oligomer by irradiation with ultraviolet rays. The kind of photoinitiator is not specifically limited, A well-known thing can be used as a photoinitiator.

In addition, 0.1 to 10% of an adhesion promoter, 0.1 to 5% of a leveling agent or a surface wetting penetrant may be added to the ultraviolet curable coating liquid, and other additives may be added as necessary.

In addition, the UV-curable coating solution further comprises 0.5 to 10% of the fluorine-based additives or polysiloxane-based additives to improve the fingerprint properties, adhesion properties, coating properties.

As the fluorine-based additive or the polysiloxane-based additive, a fluorine-based acrylate compound, a polyester-modified dimethylpolysiloxane, or a polyether-modified dimethylpolysiloxane can be used, and a fluorine-based additive having an acrylic group or a polysiloxane-based additive having an acrylic group is particularly preferable.

As the fluorine-based additive having an acryl group, any form can be used as long as perfluoropolyether (PFPE) and acrylate or vinyl are combined. However, the fluorine-based additive having acryl group is preferably selected in consideration of the usability with the ultraviolet curable monomer / oligomer.

As the polysiloxane-based additive having an acrylic group, polyester-modified acrylic functional dimethylpolysiloxane is preferable, and specifically, BYK-371, 373, UV3500, UV3530, UV3570 or Evonik Tego Chemie's Rad series and Ciba's EFKA-3832, 3835 , 3888, and the like.

In the present invention, the durability of the antifouling coating is greatly improved by coating the acrylic panel using an ultraviolet curable coating liquid to which a fluorine-based or polysiloxane-based compound having an acrylic group is added.

Hereinafter, a preferred coating method of the present embodiment will be described.

In this embodiment, in order to improve antifouling function and durability, a process of performing pretreatment on the surface on which the coating layer of the acrylic panel is to be formed is important.

The pretreatment refers to a process of plasma treatment in a plasma cleaner after washing the surface of the panel using water, a solvent and the like.

The plasma treatment means removing contaminants on the surface of the panel by using an atmospheric pressure plasma treatment, and chemical plasma treatment and physical plasma treatment may be used.

Chemical plasma treatment uses oxygen as a discharge gas to remove contaminants on the surface of a sample by reacting with active species present in the plasma. Oxygen atoms, ozone, and excitation particles that are broken in the plasma state react with the sample to form a gaseous state. Phosphorus is removed in the form of moisture and carbon dioxide, and fine surface roughness is formed through the surface modification effect.

In the physical plasma treatment, high energy ions collide with the surface of a sample to remove contaminants from the surface, and thus fine roughness is formed on the surface through a surface modification effect.

According to the removal of contaminants and the formation of fine roughness by the plasma treatment, not only the application of the coating liquid and the formation of the coating layer may be easily performed, but also the wear resistance and the salt spray resistance after coating may be greatly improved.

When the plasma pretreatment on the surface of the panel is completed as described above, the UV-curable coating solution is coated on the panel surface. Here, the coating may be performed by all wet coating methods such as spin coating, spindle coating, spraying, dipping, slits, and the like.

Subsequently, a drying process is performed to volatilize the solvent of the coating liquid. Here, the drying process may be a drying method such as IR drying, hot air drying.

After the drying step, a hard coat layer formed by UV curing is formed by polymerizing a curable polyfunctional monomer and / or oligomer in a coating solution by irradiating ultraviolet rays.

Hereinafter, the characteristics of the test and the test results for the panel coating method of the present embodiment will be described.

<Test evaluation method>

The total light transmittance (Tt) and haze were measured by JISK7105 using a haze meter (Nibbon Denshoku Kogyo, NDH 5000).

The contact angle was measured by a droplet method using a contact angle measuring instrument (Kruss, DSA100). The droplet method was carried out by dropping purified liquid droplets (diameter 2 mm) onto the coating surface and measuring the contact angle between the coated surface and purified water.

The abrasion test was performed by applying 500 g of an industrial eraser to a wear tester, placing it on a coated surface, and performing 1500 round trips (40 round trips / min, 20 mm width), and then measuring a contact angle on the worn surface.

The salt spray was performed after leaving for 72 hours in a 5% NaCl aqueous solution and 35 ° C. salt spray test, and then water was removed after washing, and the contact angle was measured after standing for 4 hours at room temperature.

Fingerprint protection is applied by pressing the inside of the thumb on the surface of the coated product to remove the fingerprint, and when placed on a black background to observe the degree of fingerprint attachment with the naked eye, the fingerprint is noticeable `` × '' and slightly visible △△ And a relatively inconspicuous thing were determined as "o".

The oil pen for writing evaluation was judged as `` ○ '' when the ink pen was not written well and when the ink of the letter was curled up when the graffiti was painted using an oil pen (name pen) on the surface of the coating.

The removal of the oil pen was judged as "○" if the surface of the coating was graffitied using an oil pen (name pen) and then wiped clean using the Kim Wiper.

<Characteristic evaluation according to the additive of coating liquid>

PMMA sheet (50mm × 50mm × 1.0T) UV-curable coating solution [12% of 6 functional urethane acrylate (Miwon Corporation) as a multifunctional monomer and / or oligomer, Dipentaerythritol hexaacrylate (Dipentaerythritol Hexaacrylate) 10% ( Skcytec), 5% Trimethylolpropane triacrylate (skcytec), 25% ethyl cellosolve as solvent, 14% xylene, 32% ethyl alcohol, Irgacure as photoinitiator 184 (Ciba-geigy Co., Ltd.) 1.5%, Glide410 (Evonik Tego Chemie Co., Ltd.) was formulated with a leveling agent to the surface wetting penetrant] was coated for 20 seconds at 500 rpm using a spin coater (spin coater). After coating, it was put in a heat-drying oven and dried at 60 ° C. for 15 minutes, and then a hard coating film was prepared by irradiating ultraviolet light under conditions of light intensity 150mw / cm 2 and light quantity 1000mJ / cm 2.

Each of the additives of the UV-curable coating solution was evaluated by different types, and the evaluation results are shown in Table 4 below.

In Table 4, BYK-333 from BYK Chemie was used as polyester-modified dimethylpolysiloxane, BYK-UV3500 from BYK Chemie was used as polyester-modified dimethylpolysiloxane having an acrylic group, and Dainippon Ink and Chemicals was used as a fluorine-based additive. The company MEGAFACE RS-50 was used, and Daikin's Optool DAC was used as the fluorine-based additive having an acryl group.

As can be seen from the <Table 4>, there was a difference in the anti-fingerprint adhesion and handwriting before and after the additive-containing fingerprint for the anti-fingerprint performance and also showed a difference in the initial contact angle. There was no difference in optical properties such as transmittance or haze according to the type of fingerprint additive, but there was a difference in contact angle.

Both polysiloxane additives and fluorine-based additives were more resistant to abrasion and salt spray than non-reactive additives in the case of having an acrylic group, that is, reactive.

In addition, the fluorinated acrylic functional compound is superior to the polysiloxane additive in durability such as initial contact angle, abrasion resistance, and salt spray, which means better anti-fingerprint and antifouling properties.

<Characteristic evaluation according to the number of times before and after atmospheric plasma treatment>

For evaluating the characteristics, atmospheric pressure plasma treatment according to a preferred embodiment of the present invention is a voltage 14 ~ 15kV, power frequency 15kHz, nitrogen (more than 99.9% purity) 3-10 lpm supply, oxygen (more than 99.9% purity) 10sccm supply, conveyor The speed was carried out under conditions of 10 mm / sec.

After atmospheric pressure plasma treatment was performed on the PMMA sheet (50mm × 50mm × 1.0T) under the above conditions, a UV-curable coating solution containing 3% of a fluorine-based acrylic functional compound (Optool DAC, Daikin) was spin coated onto the PMMA sheet. ) For 20 seconds at 500 rpm. After coating, it was put in a heat drying oven and dried at 60 ° C. for 15 minutes, and then a hard coating film was prepared by irradiating UV light under conditions of light intensity 150mw / cm 2 and light quantity 1000mJ / cm 2. The plasma treatment was evaluated in 0, 2, 4, 6, 8 times, respectively, and the evaluation results are shown in Table 5 below.

As can be seen from Table 5, there is no difference in the initial contact angle before and after plasma treatment, but it can be seen that the wear resistance and the salt spray resistance are improved. That is, the foreign matter on the surface can be removed due to the plasma treatment, and the adhesion between the coating liquid and the material can be improved by the formation of fine concavities and convexities, and as a result, the effect of improving the adhesion and durability can be confirmed.

10: Windows 110: glass
120: printed layer 130: coating layer

Claims (5)

Plasma treating the acrylic panel;
Coating the acrylic panel by further adding a fluorine-based or polysiloxane-based additive to a UV-curable coating solution including a curable polyfunctional monomer and / or oligomer, a solvent, and a photoinitiator;
Drying;
Acrylic panel coating method comprising the step of irradiating ultraviolet light. The method of claim 1,
The additive is an acrylic panel coating method, characterized in that the fluorine-based additive having an acrylic group. delete The method of claim 1,
The plasma treatment
Acrylic panel coating method using a chemical or physical atmospheric pressure plasma method. The method of claim 1,
The plasma treatment
14 to 15 kV, power frequency 15 kHz, nitrogen (purity 99.9% or more) 3-10 lpm supply, oxygen (purity 99.9% or more) 10 sccm supply, conveyer speed 10mm / sec, characterized in that the acrylic panel coating method.

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