KR101766669B1 - Anti-fouling glass film coating agent for cis glass of bill counting machines and coating method using the same - Google Patents

Abstract

The purpose of the present invention is to prevent contamination of a glass surface due to resistance generated between a CIS sensor glass surface and dust by coating the CIS sensor glass surface of a banknote counter with a coating agent with excellent abrasion resistance and contamination resistance, and then secondly coating the coating agent-coated CIS sensor glass surface of the banknote counter with a curing agent. In order to achieve the purpose, the present invention provides an antifouling glass film coating agent for a banknote counter CIS sensor glass with excellent abrasion resistance and contamination resistance. The antifouling glass film coating agent is prepared by mixing: 5 to 15 wt% of the PTFE-CNT mixed solution out of 100 wt% of a PTFE-CNT mixed solution (a) that is prepared by dispersing 90 to 99 wt% of polytetrafluoroethylene (PTFE) and 1 to 10 wt% of carbon nanotube (CNT) through a sonicator at 35 to 45C for 5 to 15 minutes; 5 to 15 wt% of one or more conductive polymers (b) selected from polyacetylene, polypyrrole, polythiophene, poly(3-alkyl-thiophene), polyphenylene sulfide, polyaniline, polythienylene vinylene, and polyfuran; 0.5 to 1.5 wt% of aluminum oxide-coated titanium dioxide (c); 5 to 15 wt% of a cationic surfactant (d); 0.5 to 1.5 wt% of a mixed filler (e) prepared by mixing a nickel-coated aluminum powder with a silica powder at a weight ratio of 1:1; 1 to 5 wt% of tetraethoxy silane (TEOS) (f); and 70 to 80 wt% of methyl ethyl ketone (g).

Description

FIELD OF THE INVENTION [0001] The present invention relates to a glass film coating agent for a CIS sensor glass and a coating method using the glass film coating agent for a CIS sensor glass,

In the present invention, the surface of a bill counter CIS sensor glass is coated with a fluorine-binding material so that various foreign substances are washed away simultaneously with the movement of the paper money by the antistatic function. As a result, the clean state of the surface of the CIS sensor glass can be maintained constantly and a clear scan can be performed, thereby enabling the discrimination of forgery of bills and the maintenance of homeostasis of the class classification function.

As described above, the present invention relates to an anti-fouling glass coating agent for a CIS sensor glass having a main function of effectively preventing contamination of the surface of a bill counter CIS sensor glass, a wear resistance and a chemical resistance, and a coating method using the same.

There are two types of image sensors, CCD and CMOS image sensor (CIS). There are differences in image quality, price and power consumption due to differences in operation principle and manufacturing process between the two sensors.

The image quality is generally better than that of CIS by CCD sensor. The reason why CIS has low image quality is that there is fixed pattern noise. CIS has a structure that uses one or several transistors for one light receiving element. Using the characteristics of the transistor, the amount of charge converted from the photodiode, which is a light-receiving element that receives light, is measured. In this process, noise is generated.

CMOS is an abbreviation for Complementary Metal Oxide Semiconductor (CMOS), which is often used to implement most electronic devices called semiconductors. CMOS is implemented with PMOS and NMOS transistors, which can realize low power. CIS is an imaging device made using CMOS manufacturing process technology.

Most CISs consist of a light-receiving part and a signal detection circuit. The light-receiving part consists of an active pixel array and surrounding pixels. The pixel consists of a photodiode that converts light into a photo-generated carrier, and a CMOS transistor that converts charge back to a signal voltage.

In the case of color CIS, color filters of R (red), G (green) and B (blue) are additionally constituted. In most cases, the color filter is constructed just above the pixel. The color filter serves to pass light incident at various wavelengths only through a specific wavelength of light.

The CIS sensor mounted on the bill counter obtains the bill image of the transmission reflection image, thereby forging the bill and recognizing the denomination.

However, when the bill counter is driven, dust is generated from the bill and accumulated in the CIS sensor that performs important functions. The dust thus accumulated deteriorates the performance of the CIS sensor and hinders quality image acquisition.

Due to such a problem, in the case of a bill counter equipped with a conventional CIS sensor, when the trouble occurs, the outer case is opened and the connector and board connected to the sensor are disassembled to separate the CIS sensor, There was a difficulty to reinstall.

This is a part that is difficult for the user to handle directly, so it was only possible to visit and handle the AS engineers. In addition, there has been a problem in that the device can not be used during the time that the AS engineer visits and processes the fault from the occurrence of the fault, and the efficiency of the fault processing becomes long.

Korean Patent Laid-Open Publication No. 10-2016-0112114 (published on September 28, 2016) Korean Registered Patent No. 10-0887573 (registered on March 02, 2009) Korean Registered Patent No. 10-0424869 (Registered Date: March 16, 2004)

The present invention prevents the contamination of the glass surface by the resistance force generated between the surface of the CIS sensor glass and the dust by coating the surface of the paper currency counter CIS sensor glass with a coating agent having excellent abrasion resistance and stain resistance, A counterfeit-resistant glass film coating agent for CIS sensor glass, and a coating method using the same. The present invention relates to an anti-fouling glass film coating agent for CIS sensor glass, It is the object of the invention to provide.

In order to achieve the above object,

The present invention relates to a process for producing a polytetrafluoroethylene (PTFE) composition comprising 90 to 99 wt% of polytetrafluoroethylene (PTFE) and 1 to 10 wt% of carbon nanotubes (CNT) through an ultrasonic disperser (Sonicator) at 35 to 45 ° C for 5 to 15 minutes 5 to 15 wt% of a 100 wt% PTFE-CNT mixed solution (a) dispersed and prepared;

Polyacetylene, polypyrrole, polythiophene, poly (3-alkyl-thiophene), polyphenylene sulfide, polyaniline (Polyaniline) 5 to 15 wt% of at least one conductive polymer selected from the group consisting of polyethylene terephthalate, polythienylene vinylene, and polyfuran;

Titanium dioxide coated with aluminum oxide (c) 0.5 to 1.5 wt%;

5 to 15 wt% of a cationic surfactant (d);

0.5 to 1.5 wt% of a mixed filler (e) composed of a nickel-coated aluminum powder and a silica powder in a weight ratio of 1: 1;

1 to 5 wt% of tetraethoxy silane (TEOS) (f);

(A + b + c + d + e + f + g) of 70 to 80 wt% of methyl ethyl ketone (g) Coating agent.

And a coating method using the coating agent for the paper currency counter CIS sensor glass,

A cleaning step S10 for removing the oil film on the surface of the CIS sensor glass for a bill counter using an oil film remover,

An antifouling coating agent spraying step (S20) of spraying an antifouling coating agent selected from claim 1 or 5 onto the surface of a CIS sensor glass for banknote counter with the oil film removed to a thickness of 5 to 40 μm;

An antifouling coating film forming step (S40) in which a CIS sensor glass for a paper currency counter coated with an antifouling coating agent is cured in an oven at 80 to 120 DEG C for 1 to 3 hours,

Applying a curing agent (S50) for spray coating the surface of the antifouling coating film to a thickness of 5 to 40 mu m,

There is provided a bill counter CIS sensor glass coating method comprising a coating film forming step (S60) in which a CIS sensor glass for a paper currency counter coated with a coating agent is cured in an oven at 80 to 100 DEG C for 1 to 3 hours .

Bills counting machine excellent in abrasion resistance and stain resistance according to the present invention When a special coating is performed using an antifouling glass coating agent for CIS sensor glass, most of the dust generated from banknotes is not accumulated in the CIS glass, So that the optimum condition for the recognition of the bill image is always maintained.

In addition, the antifouling coating film coating agent for a bill counter CIS sensor glass according to the present invention has an antistatic function, an excellent optical property, a stable surface resistance and a high durability so that a clean state of a bill counter CIS sensor glass can be stably maintained .

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a view showing the principle of foreign matter and dust adhering to the surface of a conventional bill counter CIS sensor glass. Fig.
2 is a side cross-sectional view showing a coated state using an antifouling glass coating agent for a bill counter CIS sensor glass having excellent abrasion resistance and stain resistance according to the present invention.
3 is a view showing a coating process of a surface of a bill counter CIS sensor glass according to the present invention.

Hereinafter, the technical construction according to the present invention will be described in detail with reference to the drawings.

As shown in FIG. 1, the surface of a conventional CIS sensor glass is made of a glass material, which is a polar material, and attracts foreign matter, dust or the like having a polarity to be attached thereto.

The present invention relates to a technique for preventing the surface of a CIS sensor glass from being contaminated by foreign matter such as dust through the antifouling coating shown in FIG. 2. More specifically, the present invention relates to a bill counter CIS sensor glass having excellent abrasion resistance and stain resistance An antifouling glass coating agent and a coating method using the same.

Fig. 2 is a cross-sectional side view of a CIS sensor glass surface coated according to the present invention. As shown in FIG. 2, a first coating layer 20 having an anti-fouling function and an excellent durability on the CIS sensor glass 10 and a second coating layer 20 having durability on the first coating layer 20, (30) are formed to form a laminated structure.

3, the process of coating the surface of the bill counter CIS sensor glass according to the present invention includes a cleaning process S10 (see FIG. 3) for removing the oil film on the surface of the CIS sensor glass 10 using the oil film remover, )Wow,

A step S20 of applying an antifouling glass film coating agent spraying an antifouling glass coating agent for a bill counter CIS sensor glass to a thickness of 5 to 40 mu m on the surface of the CIS sensor glass 10 for the paper currency counter from which the oil film has been removed,

An antifouling coating film forming step (S40) of curing a CIS sensor glass 10 for a paper currency counter coated with an antifouling glass coating agent into an oven and curing at 80 to 120 ° C for 1 to 3 hours,

Coating a curing agent on the surface of the antifouling coating film 20 by spray coating the curing agent to a thickness of 5 to 40 탆 (S50)

And a coating film forming step (S60) of curing the CIS sensor glass 10 for a paper currency counter coated with an antifouling glass coating agent in an oven at 80 to 100 ° C for 1 to 3 hours.

The technical structure of each step of the coating method will be described.

<Cleaning step S10>

This step removes the oil film on the surface of the CIS sensor glass 10 for the bill counter. The oil film is removed through an oil film remover.

Such an oil film removal is intended to enhance the sharpness and the transparency of the surface of the CIS sensor glass 10.

The oil film remover may be a commercially available product. Note, however, that care should be taken not to scratch the glass surface.

<Antifouling Glass Film Coating Agent Application Step (S20)>

In this step S20, the antifouling glass coating agent according to the present invention is spray coated on the surface of the CIS sensor glass 10 to a thickness of 5 to 40 탆.

The antifouling glass coating agent is an important constituent of the present invention together with a curing agent to be described later. The surface of the paper currency counter CIS sensor glass 10 is coated with the antifouling glass coating agent, and dust generated from the paper money for a long period of time of 5 years or more is coated on the surface of the CIS sensor glass It has the characteristic of being easily washed away with the paper money even if it does not accumulate or accumulates. By this characteristic, the optimum condition for the recognition of the banknote image is always maintained.

The composition of the antifouling glass coating agent according to the present invention will now be described.

The antifouling glass film coating agent is prepared by coating 90 to 99 wt% of polytetrafluoroethylene (PTFE) and 1 to 10 wt% of carbon nanotubes (CNT) with an ultrasonic disperser (Sonicator) 5 to 15 wt% of a 100 wt% PTFE-CNT mixed solution (a) dispersed for a minute;

Polyacetylene, polypyrrole, polythiophene, poly (3-alkyl-thiophene), polyphenylene sulfide, polyaniline (Polyaniline) 5 to 15 wt% of at least one conductive polymer selected from the group consisting of polyethylene terephthalate, polythienylene vinylene, and polyfuran;

Titanium dioxide coated with aluminum oxide (c) 0.5 to 1.5 wt%;

5 to 15 wt% of a cationic surfactant (d);

0.5 to 1.5 wt% of a mixed filler (e) composed of a nickel-coated aluminum powder and a silica powder in a weight ratio of 1: 1;

1 to 5 wt% of tetraethoxy silane (TEOS) (f);

(A + b + c + d + e + f + g) of 70 to 80 wt% of methyl ethyl ketone (g)

The PTFE-CNT mixed solution is prepared by mixing 90 to 99% by weight of polytetrafluoroethylene (PTFE) and 1 to 10% by weight of carbon nanotubes (CNTs) with an ultrasonic disperser (Sonicator) For 15 minutes.

The PTFE-CNT mixed solution is intended to improve the abrasion resistance of the antifouling glass coating agent by adding carbon nanotubes to polytetrafluoroethylene.

When the addition amount of the carbon nanotubes is less than 1 wt%, it is difficult to improve the abrasion resistance. When the addition amount exceeds 10 wt%, the coating is not properly performed due to the increase of the viscosity and the poor adhesion. The addition amount of the carbon nanotubes is preferably limited to a range of 1 to 10 wt% with respect to the total amount of the PTFE-CNT mixed solution.

The conductive polymer has a function as an antistatic agent in the antifouling glass coating agent. Conductive polymer is a polymer that can flow electricity literally. Most of the structures of the conductive polymer have either a single bond or a double bond.

The use of the conductive polymer can be variously used for an antistatic agent capable of preventing damage to the semiconductor product due to the generation of static electricity, harmful electromagnetic wave shielding and absorption, and the like.

Contact charging is the most common and most important, meaning that two objects are charged due to the effect of rubbing them together.

In order to effectively remove the static electricity generated by the contact charging, it is necessary to prevent the charge from being driven to one place and to dissipate it in a different energy form. In order to do so, the charge should not be stopped by contact or friction.

Such a function can be achieved by the conductive polymer and thus has a function as an antistatic agent.

When the amount of the conductive polymer used is less than 5 wt%, the function as an antistatic agent deteriorates. When the amount exceeds 15 wt%, the degree of improvement of the antistatic function is insignificant because of the conductive polymer, To 5% by weight to 15% by weight with respect to the total amount of the binder resin.

Titanium dioxide coated with aluminum oxide is used for antistatic function and prevention of flocculation of antifouling glass coating agent,

30 to 70 wt% of titanium dioxide and 30 to 70 wt% of aluminum oxide (Al ₂ O ₃ ), spherical particles of 100 to 300 nm, are reacted at a pH of 5 to 9 and a temperature of 40 to 80 ° C for 30 minutes to 3 hours .

When the amount of titanium dioxide coated with aluminum oxide is less than 0.5 wt%, it is difficult to exhibit antistatic function and anti-agglomeration prevention function properly. When the amount of titanium dioxide exceeds 1.5 wt%, viscosity increases The amount of the titanium dioxide coated with the aluminum oxide is preferably limited within a range of 0.5 to 1.5 wt% with respect to the total amount of the antifouling glass coating agent.

The cationic surfactant is used as an antistatic agent to improve the contamination property.

Surfactant As far as the antistatic agent is concerned, the antistatic agent generally has hydrophilic and hydrophilic groups in the molecule at the same time, and the lipophilic portion is attached or impregnated to the substrate and the hydrophilic portion is oriented outward. The surface of the substrate is adsorbed with water by adsorption by the hydrogen bond between the hydrophilic group of the antistatic agent and the moisture (water molecule) in the air, and the conductivity of the adsorbed water and the antistatic agent itself decreases the surface electrical resistance of the substrate, (Charge accumulation) which is a cause of generation is prevented, and the generation of static electricity is prevented.

The cationic surfactant is a quaternary ammonium salt having a long alkyl chain. The cationic surfactant is a quaternary ammonium salt. The quaternary ammonium salt is a cationic surfactant. In some cases, quaternary ammonium groups are included. At this time, the anion portion becomes hydrochloric acid, methosulfate, or nitrate.

As the cationic surfactant, any one or two selected from alkyl quaternary ammonium salts of alkyltrimethylammonium chloride or benzalkonium chloride may be used.

If the amount of the cationic surfactant used is less than 5 wt%, it is difficult to expect improvement in the contamination resistance. If the amount exceeds 15 wt%, the coating quality may be deteriorated. Therefore, the amount of the cationic surfactant used is preferably Is preferably limited to a range of 5 to 15 wt%.

The mixed filler formed by mixing the nickel-coated aluminum powder and the silica powder in a weight ratio of 1: 1 provides an anti-abrasion coating and antistatic function.

The nickel-coated aluminum powder was prepared by carrying an aluminum powder to a solution of 5 wt% sodium hydroxide (NaOH (Kanto chemicals)) for 2 to 5 minutes and removing the aluminum surface oxide film by etching,

The aluminum powder from which the oxide film was removed was placed in a Ni electroless plating solution adjusted to 58 to 62 ° C and a pH of 9.0, followed by addition of hydrazine as a reducing agent, followed by electroless Ni plating treatment at 70 to 90 rpm for 10 to 20 minutes After filtration using a filler, it is prepared by drying at 75 ~ 85 ℃ for 1 ~ 3 hours.

The silica powder was pulverized in a beads mill having a cooling jacket at 4,000 to 6,000 rpm for 15 to 30 minutes using 1 to 2 mm zirconia beads to prepare powders of 5 μm or less do.

When the amount of the mixed filler used is less than 0.5 wt%, it is difficult to improve the abrasion resistance and antistatic function of the coating film. If the amount exceeds 1.5 wt%, the coating quality may be affected. Is preferably limited within a range of 0.5 to 1.5 wt%.

Tetraethoxy silane (TEOS) plays a role in improving ozone resistance and surface hardness of the coating film. If the content is less than 1 wt%, such an effect is unlikely to be expected. If the content exceeds 5 wt% The use amount of the tetraethoxysilane (TEOS) is preferably limited to a range of 1 to 5 wt% with respect to the total weight of the antifouling glass coating agent.

The methyl ethyl ketone may be selected from toluene, isopropyl alcohol, n-butanol and propylene glycol methyl ether as a solvent. It is also possible to use it.

When the amount of the solvent used is less than 70 wt%, the antifouling coating film has a high viscosity, so that it is difficult to uniformly coat the coating uniformly. When the amount of the solvent exceeds 80 wt%, the viscosity is too low, Is preferably limited to a range of 70 to 80 wt% with respect to the total weight of the antifouling glass coating agent.

As a concrete formulation of the antifouling glass coating agent,

A PTFE-CNT mixture of 100 wt% prepared by dispersing 95 wt% of polytetrafluoroethylene (PTFE) and 5 wt% of carbon nanotubes (CNT) at 40 ° C for 10 minutes through an ultrasonic disperser (Sonicator) 10 wt% in solution (a);

5 wt% of conductive polymer (b) of polythienylene vinylene;

Titanium dioxide coated with aluminum oxide (c) 0.5 wt%;

5 wt% of a cationic surfactant (d) of alkyltrimethylammonium chloride;

1.0 wt% of a mixed filler (e) composed of a nickel-coated aluminum powder and a silica powder in a weight ratio of 1: 1;

3 wt% of tetraethoxysilane (TEOS) (f);

And a mixture (a + b + c + d + e + f + g) of 75.5 wt% of methyl ethyl ketone (g).

<Antifouling coating film forming step (S40)> [

In this step S40, a CIS sensor glass 10 for a paper currency counter coated with an antifouling glass coating agent is placed in an oven and cured at 80 to 120 ° C for 1 to 3 hours.

If the curing temperature is less than 80 ° C, the curing time is required for a long time. If the curing temperature exceeds 120 ° C, cracking may occur in the coating film, and therefore, the curing temperature is preferably maintained within a range of 80 to 120 ° C.

If the curing time is less than 1 hour, the curing is not properly performed. If the curing time exceeds 3 hours, the curing time is preferably within a range of 1 to 3 hours Do.

&Lt; Curing agent application step (S50) >

In this step S50, the curing agent is spray-coated on the surface of the first coating layer 20 made of the antifouling coating film to a thickness of 5 to 40 mu m.

The reason for applying the curing agent is to protect the antifouling coating film from an external environment such as scratch, discoloration, oxidation and the like.

The curing agent is an organic / inorganic hybrid coating solution using silica and an epoxy resin,

The coating solution is prepared by mixing 10 to 30 wt% of tetraethoxysilane (TEOS) as a silica precursor, 20 to 60 wt% of water (H ₂ O) and 20 to 60 wt% of ethanol (EtOH) After the solution was stirred, HCl as an acid catalyst was added so that the acidity of the solution became 1 to 1.5, and the solution was stirred for 30 to 2 hours to prepare silica sol.

5 to 10 wt% of a coupling agent (3-isocyanatopropyl) triethoxysilane (IPTES) and 90 to 95 wt% of an epoxy resin are mixed, and the mixture is stirred at 60 to 80 ° C for 2 to 5 hours Lt; / RTI &gt; to prepare an epoxy solution,

30 to 40 wt% of the silica sol and 60 to 70 wt% of the epoxy solution are mixed and stirred for 30 minutes to 2 hours to form a mixture, and then methyl tetrahydrophthalic anhydride is added, And methyltetrahydrophthalic anhydride is added in a weight ratio of 1.5 to 2.5: 1, and the mixture is stirred at 200 to 400 rpm for 20 minutes to 40 minutes.

The coating solution forms an organic-inorganic hybrid structure. The coating solution is free from cracks through a hybrid of a silica sol and an epoxy cured product, is excellent in adhesion to a substrate, and has wear resistance characteristics.

By this characteristic, the antifouling coating film coating film of the first coating layer 20 can be protected from the external environment such as scratch, discoloration and oxidation.

&Lt; Curing agent curing step (S60) >

In this step S60, a CIS sensor glass 10 for a bill counter in a state in which a hardener is coated on the first coating layer 20 in the previous step S50 is placed in an oven and heated at 80 to 100 ° C for 1 to 3 hours Curing for a period of time to form a second coating layer 30.

If the curing temperature is lower than 80 ° C, the curing rate is lowered. If the curing temperature exceeds 100 ° C, the uniformity of the coating layer is lowered. Therefore, the temperature is preferably limited within a range of 80 to 100 ° C.

If the curing time is less than 1 minute, the coating layer is not sufficiently cured, and the stability of the coating layer may deteriorate. If the curing time exceeds 3 hours, the uniformity of the coating layer may be lowered due to excessive curing, Is preferably limited within a range of 1 hour to 3 hours.

Bills counting machine excellent in abrasion resistance and stain resistance according to the present invention When a special coating is performed using an antifouling glass coating agent for CIS sensor glass, most of the dust generated from banknotes is not accumulated in the CIS glass, So that it is possible to keep the optimum condition for the recognition of the bill image at all times.

10: Counter sensor CIS sensor glass
20: first coating layer
30: Second coating layer

Claims (7)

90 to 99 wt% of polytetrafluoroethylene (PTFE) and 1 to 10 wt% of carbon nanotubes (CNT) are dispersed at 35 to 45 ° C for 5 to 15 minutes through an ultrasonic disperser (Sonicator) 5 to 15 wt% of the 100 wt% PTFE-CNT mixed solution (a);
Polyacetylene, polypyrrole, polythiophene, poly (3-alkyl-thiophene), polyphenylene sulfide, polyaniline (Polyaniline) 5 to 15 wt% of at least one conductive polymer selected from the group consisting of polyethylene terephthalate, polythienylene vinylene, and polyfuran;
Titanium dioxide coated with aluminum oxide (c) 0.5 to 1.5 wt%;
5 to 15 wt% of a cationic surfactant (d);
0.5 to 1.5 wt% of a mixed filler (e) composed of a nickel-coated aluminum powder and a silica powder in a weight ratio of 1: 1;
1 to 5 wt% of tetraethoxy silane (TEOS) (f);
And a mixture (a + b + c + d + e + f + g) of 70 to 80 wt% of methyl ethyl ketone (g) Antifouling glass coating agent for glass.
The method according to claim 1,
Titanium dioxide coated with aluminum oxide is prepared by mixing 30 to 70 wt% of spherical particles of 100 to 300 nm and 30 to 70 wt% of aluminum oxide (Al ₂ O ₃ ) under conditions of pH 5 to 9 and temperature of 40 to 80 ° C. for 30 minutes To 3 hours. The anti-fouling glass coating agent for CIS sensor glass has excellent abrasion resistance and stain resistance.
The method according to claim 1,
The nickel-coated aluminum powder was prepared by carrying an aluminum powder to a solution of 5 wt% sodium hydroxide (NaOH (Kanto chemicals)) for 2 to 5 minutes, removing the aluminum surface oxide film by etching,
The aluminum powder from which the oxide film was removed was placed in a Ni electroless plating solution adjusted to 58 to 62 ° C and a pH of 9.0, followed by addition of hydrazine as a reducing agent, followed by electroless Ni plating treatment at 70 to 90 rpm for 10 to 20 minutes And then dried at 75 to 85 ° C for 1 to 3 hours. The antifouling coating film of the present invention is excellent in abrasion resistance and stain resistance.
The method according to claim 1,
The silica powder is prepared by pulverizing a beads mill having a cooling jacket at 4,000 to 6,000 rpm for 15 to 30 minutes using 1 to 2 mm zirconia beads to prepare a powder having a size of 5 μm or less A bill counter with excellent abrasion resistance and stain resistance. Antifouling glass coating agent for CIS sensor glass.
The method according to claim 1,
Wherein the cationic surfactant is at least one selected from the group consisting of alkyltrimethylammonium chloride or quaternary ammonium chloride of benzalkonium chloride. The antifouling coating film for antifouling coating film for CIS sensor glass is excellent in resistance to abrasion and stain resistance.
A cleaning step S10 for removing the oil film on the surface of the CIS sensor glass 10 for a bill counter using an oil film remover,
The antifouling glass coating agent for CIS sensor glass is spray-coated on the surface of the CIS sensor glass 10 for the paper currency counter from which the oil film has been removed to a thickness of 5 to 40 탆, An antifouling glass film coating agent application step S20,
An antifouling coating film forming step (S40) of curing a CIS sensor glass 10 for a paper currency counter coated with an antifouling glass coating agent into an oven and curing at 80 to 120 ° C for 1 to 3 hours,
Coating a curing agent on the surface of the antifouling coating film 20 by spray coating the curing agent to a thickness of 5 to 40 탆 (S50)
And a coating film forming step (S60) of curing the CIS sensor glass for paper currency counter coated with a coating agent in an oven at 80 to 100 DEG C for 1 to 3 hours. Sensor glass.
The method of claim 6,
The curing agent is an organic / inorganic hybrid coating solution using silica and an epoxy resin,
The coating solution is prepared by mixing 10 to 30 wt% of tetraethoxysilane (TEOS) as a silica precursor, 20 to 60 wt% of water (H ₂ O) and 20 to 60 wt% of ethanol (EtOH) HCl as an acid catalyst was added thereto so that the acidity of the solution became 1 to 1.5, and the mixture was stirred for 30 to 2 hours to prepare a silica sol,
5 to 10 wt% of a coupling agent (3-isocyanatopropyl) triethoxysilane (IPTES) and 90 to 95 wt% of an epoxy resin are mixed, and the mixture is stirred at 60 to 80 ° C for 2 to 5 hours Lt; / RTI &gt; to prepare an epoxy solution,
30 to 40 wt% of the silica sol and 60 to 70 wt% of the epoxy solution are mixed and stirred for 30 minutes to 2 hours to form a mixture, and then methyl tetrahydrophthalic anhydride is added, Wherein the epoxy resin and methyltetrahydrophthalic anhydride are added in a weight ratio of 1.5 to 2.5: 1 and stirred at 200 to 400 rpm for 20 minutes to 40 minutes.

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