JP7788752B2 - Wet coating agent for vehicles and its manufacturing method - Google Patents

Description

The present specification relates to a wet coating agent for vehicles and a method for manufacturing the same, and more particularly to a wet coating agent for vehicles that can be used to conveniently coat the surface of vehicles and a method for manufacturing the same.

Unless otherwise indicated herein, the subject matter described in this identification section is not prior art with respect to the claims of this application, and its inclusion in this identification section is not an admission that it is prior art.

Paint coated on the surface of a vehicle is easily contaminated and damaged because it is constantly exposed to foreign objects on the road, changes in external temperature and humidity, and rain and snow caused by climate changes.

In recent years, glass film coatings have been applied to vehicle paint surfaces to prevent contamination or damage, but due to the high coating costs and low service reliability relative to the cost, there is an increasing demand for people to coat vehicle paint themselves.

However, applying coatings to vehicle paint using existing coating agents is quite difficult, so there is a need to develop a product that allows vehicle users, who are not professional installers, to coat vehicle paint conveniently and easily.

In this regard, Patent Document 1 discloses a gloss coating agent for automobiles with enhanced cleaning and coating functions and a method for manufacturing the same, and Patent Document 2 discloses a gloss coating agent for automobiles and a method for manufacturing the same.

However, existing inventions do not disclose technology related to wet coating agents that allow even users with little coating experience to easily apply coating agents to the surface of a vehicle.

Korean Patent Registration No. 10-2508223 Korean Patent Registration No. 10-2482458

The object of this specification is to provide a wet coating agent for vehicles that can be sprayed onto a vehicle and then rinsed with high-pressure water to conveniently coat the vehicle surface, and a method for manufacturing the same.

Furthermore, this specification is not limited to the technical problems described above, and it is clear that other technical problems may be derived from the following explanation.

According to one embodiment of the disclosure, a wet coating agent for vehicles includes decamethylcyclopentasiloxane, purified water, an alcohol-based nonionic surfactant, amodimethicone oil, and a fluorine-based silane.

The vehicle wet coating agent may also contain 1 to 5 wt. % of decamethylcyclopentasiloxane, 43 to 78 wt. % of purified water, 5 to 10 wt. % of the alcohol-based nonionic surfactant, 40 to 50 wt. % of the amodimethicone oil, and 0.5 to 2 wt. % of the fluorine-based silane.

According to another embodiment of the disclosure, a method for producing a wet coating agent for vehicles includes a first stirring step of stirring decamethylcyclopentasiloxane, purified water, an alcohol-based nonionic surfactant, and amodimethicone oil to produce a first mixed solution, a second stirring step of adding a fluorine-based silane to the first mixed solution to produce a second mixed solution, and a third stirring step of adding purified water to the second mixed solution to produce a third mixed solution.

Furthermore, the first stirring step may involve stirring 1 to 5 wt. % of the decamethylcyclopentasiloxane, 42 to 55 wt. % of the purified water, 5 to 10 wt. % of the alcohol-based nonionic surfactant, and 40 to 50 wt. % of the amodimethicone oil.

Furthermore, the second stirring step may involve adding 0.5 to 2 wt % of the fluorine-based silane and stirring.

Furthermore, in the third stirring step, 1 to 23 wt. % of the purified water may be further added and stirred.

Furthermore, the fluorine-based silane may be trifluoropropyltrimethoxysilane.

According to one embodiment disclosed herein, the wet coating agent for vehicles can be applied by simply spraying it onto the damp surface of the vehicle and rinsing it with high-pressure water, which has the advantage of improving slickness, slip resistance, and stain resistance while maintaining the original color and transparency of the vehicle surface.

In addition, this wet coating agent for vehicles can be applied not only to the surface of the vehicle, but also to the surfaces of wheels, glass, metals, and polymeric materials attached to the vehicle, making it effective in protecting the surfaces of various parts attached to the vehicle.

In addition, this wet coating agent for vehicles is applied to the surface of a vehicle to form a coating film, which maintains the vehicle's unique color and transparency while also improving the slickness, slip resistance, hydrophobicity, and water repellency of the vehicle surface.

Furthermore, this wet coating agent for vehicles has the advantage of forming a coating film not only on painted surfaces formed on the surface of a vehicle, but also on all parts of the vehicle, including wheels, glass, metals, and polymer exterior materials.

Furthermore, the effects of the present invention as described above are naturally achieved by the structure of the described content, regardless of whether the inventor is aware of them. Therefore, the effects described above are merely some of the effects of the described content and should not be considered to describe all of the effects that the inventor understands or that actually exist. Furthermore, the effects of the present invention must be further understood from the overall description in the specification, and even if they are not explicitly described, if a person with ordinary skill in the technical field to which the described content pertains would recognize such effects from the specification, they should be considered to be effects described in the specification.

1 is a flowchart of a method for manufacturing a wet coating agent for vehicles according to an embodiment of the present specification. 2 is a diagram showing components contained in a first mixed solution mixed in a first stirring step of the method for manufacturing a wet coating agent for vehicles of FIG. 1; 2 is a diagram showing components contained in a second mixed liquid and a third mixed liquid mixed in a second stirring step and a third stirring step, respectively, of the method for manufacturing a wet coating agent for vehicles of FIG. 1; 2 is a schematic diagram illustrating a contact angle measurement state performed to analyze the hydrophilicity of a coating film formed on a vehicle surface by the vehicle wet coating agent of FIG. 1; FIG. 1 is a schematic diagram of a friction coefficient measuring device that is in close contact with the surface of a vehicle to measure the friction coefficient of the surface of the vehicle. 1 is a graph illustrating the concept of coefficient of friction.

The structure, operation, and effects of a preferred embodiment of a wet coating agent for vehicles and a manufacturing method thereof will now be described with reference to the accompanying drawings. For reference, in the following drawings, each component is omitted or shown schematically for convenience and clarity, and the size of each component does not reflect its actual size. Also, the same reference numerals refer to the same components throughout the specification, and reference numerals for the same components are omitted in individual drawings.

Referring to Figures 1 to 3, the wet coating agent for vehicles includes decamethylcyclopentasiloxane, purified water, an alcohol-based nonionic surfactant, amodimethicone oil, and a fluorine-based alkoxysilane.

Fluorine-based alkoxysilanes are compositions that fall under the category of fluorine-based silanes, and fluorine-based silanes include (3,3,3-trifluoropropyl)trimethoxysilane ((3,3,3-TRIFLUOROPROPYL)TRIMETHOXYSILANE), perfluorooctyltriethoxysilane (1H,1H,2H,2H), Perfluorooctyltriethoxysilane, trimethoxy(1H,1H,2H,2H heptadecafluorodecyl)silane, heptadecafluorodecyltriisopropoxysilane, fluorine-containing chlorosilane compounds, perfluoroalkylsilane compounds, perfluoromethacrylate compounds, perfluorosulfonyl chloride compounds, and perfluorosulfonic acid.

A wet coating agent for vehicles is sprayed onto the surface of a vehicle that is still damp or has been dehydrated, and then spreads over the surface with high-pressure water, forming a coating film on the vehicle surface. This coating film improves the water repellency, slickness, hydrophobicity, slip resistance, durability, and stain resistance of the vehicle surface.

When the hydrophobicity or water repellency of the coating film increases, when water comes into contact with the surface of the coating film, the water is not dispersed due to the surface tension of the coating film surface, but is instead expelled by the coating film.

When the slickness and slipperiness of the coating film increase, the surface friction of the coating film decreases, and even if contaminants, including dust, adhere to the coating film, the contaminants slide and are separated from the coating film.

The decamethylcyclopentasiloxane contained in the vehicle wet coating agent is a low-viscosity, highly volatile silicone with low surface tension, which improves the hydrophobic or water-repellent properties of the vehicle wet coating agent applied to the vehicle, reduces the coefficient of friction, and its high volatility improves the coating work speed.

In addition, the amodimethicone oil contained in the vehicle wet coating agent is a silicone polymer with an amino functional group substituted at the end, which has the advantage of being contained in the coating film that forms when the vehicle wet coating agent is sprayed onto the vehicle surface, protecting the vehicle surface.

In addition, the fluorine-based alkoxysilane contained in the vehicle wet coating agent has the advantage of improving the slickness, hydrophobicity, water repellency, and slip properties of the coating film applied to the vehicle surface due to the low surface energy of fluorine itself.

Fluorine has a high electron density, the second smallest atomic radius after hydrogen, and high electronegativity, which allows it to form strong carbon-fluorine bonds. Due to these properties of fluorine, monomers containing perfluoroalkyl groups exhibit extreme hydrophobicity, with a critical surface tension of 5-10 dynes/cm.

In addition, fluorine-coated products are less susceptible to the chemical environment and have the advantages of high heat resistance, insulation, surface resistivity, abrasion resistance, acid resistance, and base resistance, as well as being easy to clean.

Referring to FIG. 1, the method 100 for manufacturing a wet coating agent for vehicles includes a first stirring step (S110) of mixing decamethylcyclopentasiloxane, purified water, an alcohol-based nonionic surfactant, and amodimethicone oil, a second stirring step (S120) of adding a fluorine-based alkoxysilane and stirring, and a third stirring step (S130) of adding purified water and stirring.

Meanwhile, the method 100 for manufacturing a wet coating agent for vehicles may further include a nitrogen filling step (S105), which is performed at a corresponding time before the first stirring step (S110) is performed.

Specifically, the nitrogen filling step (S105) is a step of injecting nitrogen ( _N2 ) gas into a reaction vessel having a reaction space formed therein to fill the inside of the reaction vessel with nitrogen, and once the reaction space is filled with nitrogen, the injection of nitrogen is stopped.

In the first stirring step (S110), 1-5 wt% decamethylcyclopentasiloxane, 42-55 wt% purified water, 5-10 wt% alcohol-based nonionic surfactant, and 40-50 wt% amodimethicone oil are stirred inside a reaction vessel to produce a first mixture (step S110).

Specifically, in the first stirring step (S110), 1-5 wt% decamethylcyclopentasiloxane, 42-55 wt% purified water, 5-10 wt% alcohol-based nonionic surfactant, and 40-50 wt% amodimethicone oil are stirred at 50-100 rpm for 9.5 to 18.5 hours (step S110).

Referring to FIGS. 1 and 3, in the second stirring step (S120), 0.5 to 2 wt. % of trifluoropropyltrimethoxysilane (TFPTMS), a type of fluorine-based alkoxysilane, is added to the first mixture and stirred to produce a second mixture (step S120).

Specifically, in the second stirring step (S120), 0.5 to 2 wt. % of trifluoropropyltrimethoxysilane (TFPTMS), a type of fluorine-based alkoxysilane, is added to the first mixture and stirred at 50 to 100 rpm for 5 to 10 hours (step S120).

Referring to FIGS. 1 and 3, in the third stirring step (S130), 1 to 23 wt. % of purified water is further added to the second mixture and stirred to produce a third mixture, which is then poured into a container or packaged to complete the wet coating agent for vehicles (step S130).

Specifically, in the third stirring step (S130), 1 to 23 wt. % purified water is added to the second mixture and stirred at 50 to 100 rpm for 3 to 8 hours to produce the third mixture (step S130).

Meanwhile, 1 to 23 wt% of purified water added in the third stirring step (S130) can be added to the reaction vessel along with 42 to 55 wt% of purified water added in the first stirring step (S110). Here, the amount of purified water can be 43 to 78 wt%.

Decamethylcyclopentasiloxane is included in vehicle wet coating agents to improve the slickness, slipperiness, strength, and gloss durability of the coating film applied to the vehicle surface, as well as enhance the micro-scratch prevention effect and reduce stickiness when the coating film comes into contact with the skin.

In addition, the decamethylcyclopentasiloxane contained in the vehicle wet coating agent is a low-viscosity, highly volatile silicone with low surface tension, which improves the hydrophobicity or water repellency of the coating film applied to the vehicle using the vehicle wet coating agent, reduces the coefficient of friction, and its high volatility improves the coating work speed.

In addition, decamethylcyclopentasiloxane, when included in the first mixture, increases the autoignition point of the vehicle wet coating agent produced in the third mixing step (S130), thereby increasing the autoignition point of the coating film formed on the vehicle surface by the vehicle wet coating agent and improving the safety of the coating film.

In addition, the silicon (Si) contained in decamethylcyclopentasiloxane has low surface tension and reduces the coefficient of friction, so a wet coating agent for vehicles containing decamethylcyclopentasiloxane has the advantage of lowering the coefficient of friction of the coating film applied to the surface of a vehicle.

The alcohol-based nonionic surfactant functions to ensure that the fluorine-based alkoxysilane added in the second stirring step (S120) is effectively mixed with the purified water, and the content of the alcohol-based nonionic surfactant is preferably 5 to 10 wt %.

Alcohol-based nonionic surfactants also have the advantage of allowing the silicone-based polymer amodimethicone oil and fluorine-based alkoxysilane to mix effectively with each other.

The alcohol-based nonionic surfactant emulsifies the amodimethicone oil and decamethylcyclopentasiloxane, allowing them to mix effectively.

Furthermore, by including an alcohol-based nonionic surfactant in the first mixed liquid, the particle size of the amodimethicone oil and fluorine-based alkoxysilane is formed to be relatively smaller than when the alcohol-based nonionic surfactant is not included in the first mixed liquid.

In addition, because the particle size of the amodimethicone oil and fluorine-based alkoxysilane is small, when the vehicle wet coating agent produced after the third stirring step (S130) is coated on the surface of a vehicle, the thickness of the coating film formed is uniform, and there is an advantage in that the occurrence of residue or stains on the coating film is suppressed.

In addition, the particle size of the amodimethicone oil and fluorine-based alkoxysilane is reduced by the alcohol-based nonionic surfactant and agitation, which has the advantage of forming a coating film with excellent stain resistance, hydrophobicity, water repellency, and durability, even when the wet coating agent for vehicles is applied while water or shampoo residue remains on the surface of the vehicle during the vehicle washing process.

For example, the typical process for forming a coating film on the surface of a conventional vehicle involves a total of eight steps: (1) pre-wash (high-pressure water washing), (2) applying snow foam or car shampoo to the vehicle surface, (3) shampooing or using a snow foam mitt, (4) pre-wash (high-pressure water washing), (5) removing water from the vehicle, (6) spraying the wet vehicle coating agent, (7) buffing (wiping) the hardened coating area with a towel, and (8) waiting a predetermined amount of time for the coating area to harden.

However, when the particle size of the amodimethicone oil and fluorine-based alkoxysilane is reduced by the use of an alcohol-based nonionic surfactant and agitation, a coating film is formed on the vehicle surface even when the vehicle wet coating agent is applied while water or shampoo ingredients remain on the vehicle surface. This has the advantage of shortening the process to (1) pre-wash (high-pressure water washing), (2) snow foam or car shampoo application, (3) shampoo or snow foam mitt application, (4) vehicle wet coating agent spraying, (5) pre-wash (high-pressure water washing), and (6) water removal.

Meanwhile, the alcohol-based nonionic surfactant contained in the first mixed solution is preferably 5% to 10% by weight, which allows the particle size of the amodimethicone oil or fluorine-based alkoxysilane to be processed relatively small, maintains the content of amodimethicone oil or fluorine-based alkoxysilane at an appropriate level, and stably maintains the physical properties of the coating film.

The alcohol-based nonionic surfactant contained in the first mixture includes polyethylene glycol tridecyl ether and ethoxylated propoxylated alcohols (alcohols, (C=11-14)-iso-, (C=13)-rich, ethoxylated propoxylated), of which ethoxylated propoxylated alcohols are preferred.

Amodimethicone oil (amodimethicone) is a type of siloxane polymer or silicone polymer with an amino functional group substituted at the end. It has excellent emulsifying properties, increases the solubility of various ingredients, and also functions as an antifoaming agent, preventing the formation of unnecessary voids in coating films and creating a relatively smooth surface.

Amodimethicone oil also forms a coating film on the vehicle surface to protect it from external stimuli, and the low surface tension of the silicone itself improves hydrophobicity, water repellency, and slip resistance. The amino functional group prevents static electricity buildup on the vehicle surface, preventing dust from sticking to the coating film.

In addition, substances containing amodimethicone oil or its derivatives have amine groups and are positively ionized, which causes particle disorder by increasing the spacing between particles in the coating film through electrostatic forces, acting as a bridge.

In addition, substances containing amodimethicone oil or its derivatives have the advantage that the dispersed structure of the particles contained in the coating film is stably maintained, significantly increasing the dispersibility and thickening effect of the coating film, and making it easier to disperse using high-pressure water.

In addition, since amodimethicone oil generally has hydroxyl groups (-OH) at both ends, reactive amodimethicone oils that undergo dehydration condensation reactions can be used. When a coating film is formed by mixing amodimethicone oil and silicone particles together, this has the advantage of providing excellent protection against heat damage to the coating film.

In addition, amodimethicone oil has excellent spreadability, making the feel of a coating film containing amodimethicone oil soft and silky, and improving the hydrophobicity, water repellency, and gloss of a coating film containing amodimethicone oil.

In addition, the improved dispersibility of amodimethicone oil reduces the occurrence of cracks in the coating film, and to fully maintain the functionality of the amodimethicone oil contained in the coating film, the weight percentage of amodimethicone oil is preferably 40-50%.

Fluorine-based alkoxysilanes include (3,3,3-trifluoropropyl)trimethoxysilane ((3,3,3-TRIFLUOROPROPYL)TRIMETHOXYSILANE), 1H,1H,2H,2H-perfluorooctyltriethoxysilane (1H,1H,2H,2H-perfluorooctyltriethoxysilane), and trimethoxy (1H,1H,2H,2H-heptadecafluorodecylsilane). It is preferable to use one of heptadecafluorodecylsilane and heptadecafluorodecyltriisopropoxysilane.

In addition, a fluorine-based silane may be added in place of the fluorine-based alkoxysilane added in the second stirring step (S120). The fluorine-based silane may be any one of a fluorine-containing chlorosilane compound, a perfluoroalkylsilane compound, a perfluoromethacrylate compound, a perfluorosulfonyl chloride compound, or a perfluorosulfonic acid compound.

Specifically, the perfluoroalkylsilane compound may be trichloro(1H,1H,2H,2H-perfluorooctyl)silane or triethyl(trifluoromethyl)silane.

It is preferable to use perfluorooctyl methacrylate (1H,1H-perfluorooctyl methacrylate) as the perfluoromethacrylate compound, and it is preferable to use heptadecafluoro-1-octane sulfonyl chloride as the perfluorosulfonyl chloride compound.

Fluorine-based alkoxysilane is used as a surface treatment agent for organic or inorganic materials, and when included in the vehicle wet coating agent produced in the third mixing step (S130), it improves the slickness, slipperiness, release properties, hydrophobicity, water repellency, and oil repellency of the coating film formed on the vehicle surface by the vehicle wet coating agent.

Trifluoropropyltrimethoxysilane, known by the trade name DOWSIL Q3-9030 Silane, is used in coating synthesis, silicone polymer production, and surface treatment. It improves the slickness, hydrophobicity, water repellency, slip resistance, and durability of the coating film applied to the vehicle surface using the vehicle wet coating agent produced in the third mixing step (S130).

Trifluoropropyltrimethoxysilane improves the hydrophobicity, water repellency, and slip resistance of coating films containing trifluoropropyltrimethoxysilane due to the low surface energy of the fluorine contained in it, and chemically bonds with all hydroxyl groups (-OH) present on the painted surface formed on the surface of the vehicle, improving the durability of the coating film.

In addition, the fluorine-based alkoxysilane contained in the vehicle wet coating agent has the advantage of improving the slickness (slick feel), hydrophobicity, water repellency, and slip properties of the vehicle wet coating agent applied to the vehicle surface due to the low surface energy of fluorine itself.

Furthermore, fluorine has a high electron density, the second smallest atomic radius after hydrogen, and high electronegativity, which allows it to form strong carbon-fluorine bonds. Due to these properties of fluorine, monomers containing perfluoroalkyl groups exhibit extreme hydrophobicity, with a critical surface tension of 5-10 dynes/cm.

In addition, fluorine-coated products are less susceptible to the chemical environment and have the advantages of high heat resistance, insulation, surface resistivity, abrasion resistance, acid resistance, and base resistance, as well as being easy to clean.

Instead of the fluorine-based alkoxysilane added in the second stirring step (S120), triethoxyoctylsilane, a fluorine-based silane, can be added to the first mixture. When a vehicle wet coating agent containing triethoxyoctylsilane forms a coating film on the surface of a vehicle, it forms a hydrophobic layer on the vehicle surface, which has the advantage of improving the hydrophobicity, water repellency, oxidation resistance, base resistance, and corrosion resistance of the coating film.

Referring to Table 1 below and the attached Figure 4, the contact angles of the vehicle surface 10 on which no coating film has been formed as disclosed in Table 1 are values derived by cleaning the vehicle surface 10, then applying a drop of water to the vehicle surface 10 on which no coating film has been formed using a Kruss DSA25 contact angle measuring instrument according to ASTM D 5946, and measuring the contact angle of the drop of water, the process being repeated a number of times.

A vehicle surface 10 on which no wet coating agent for vehicles has been applied and no coating film has been formed is cleaned through the steps of (1) pre-washing (high-pressure water washing), (2) applying snow foam or car shampoo to the vehicle surface, (3) shampooing or snow foam mitt work, (4) pre-washing (high-pressure water washing), and (5) removing water from the vehicle, and the contact angle of the vehicle surface 10 is measured using a contact angle measuring device.

When analyzing water droplets applied to the vehicle surface 10 using a contact angle measuring device, it can be confirmed that the hydrophilicity increases in proportion to the decrease in the contact angle of the water droplets, and the hydrophobicity or water repellency increases in proportion to the increase in the contact angle of the water droplets.

The coating film disclosed in Table 1 is formed on the vehicle surface 20 using a wet coating agent for vehicles. Here, the wet coating agent for vehicles contains 1 to 5 wt% decamethylcyclopentasiloxane, 43 to 78 wt% of the purified water, 5 to 10 wt% of the alcohol-based nonionic surfactant, 40 to 50 wt% of the amodimethicone oil, and 0.5 to 2 wt% of trifluoropropyltrimethoxysilane.

A vehicle surface 10 on which no wet coating agent for vehicles has been applied and no coating film has been formed is cleaned through the steps of (1) pre-washing (high-pressure water washing), (2) applying snow foam or car shampoo to the vehicle surface, (3) shampooing or snow foam mitt work, (4) pre-washing (high-pressure water washing), and (5) removing water from the vehicle, and the contact angle of the vehicle surface 10 is measured using a contact angle measuring device.

Referring to FIG. 4, the first one-side angle 11 and the first other-side angle 12 are contact angles derived by analyzing a water droplet applied to the vehicle surface 10 on which no coating film has been formed using a contact angle meter.

The first side angle 11 refers to the angle formed between a first tangent line that contacts one side of the water droplet applied to the vehicle surface 10 on which no coating film is formed and the part of the vehicle surface 10 to which the water droplet is in close contact.

The first other side angle 12 refers to the angle formed between a second tangent line that contacts the other side of the water droplet applied to the vehicle surface 10 on which no coating film is formed, and the part of the vehicle surface 10 to which the water droplet is in close contact.

Here, the first tangent line refers to a line that extends a predetermined distance in a straight line away from the vehicle surface 10 while being in contact with a portion of the surface of the water droplet adjacent to one end point of the contact surface where the water droplet and the vehicle surface 10 meet when viewed from the side.

The second tangent line refers to a line that extends a predetermined distance in a straight line away from the vehicle surface 10 while in contact with a portion of the surface of the water droplet adjacent to the other end point of the contact surface where the water droplet and the vehicle surface 10 meet when viewed from the side.

Referring to Table 1, it can be seen that the values derived for the first one-side angle 11 and the first other-side angle 12 change depending on the number of measurements. In particular, it can be seen that the first one-side angle 11 and the first other-side angle 12 measured early are relatively higher than the first one-side angle 11 and the first other-side angle 12 measured later.

It can also be seen that regardless of the increase in the number of measurements, the values of the first one-side angle 11 and the first other-side angle 12 measured with a single, identical water drop using a contact angle measuring device show a small deviation of 0.1 to 0.4°.

The contact angles of the vehicle surface 20 on which the coating film disclosed in Table 1 is formed are values derived by applying a wet coating agent for vehicles to the vehicle surface 20 while cleaning the vehicle surface, and measuring the contact angle of the vehicle surface 20 on which the coating film is formed using a KRUSS DSA25 contact angle measuring device.

When analyzing water droplets applied to the vehicle surface 20 using a contact angle measuring device, it can be confirmed that the hydrophilicity increases in proportion to the decrease in the contact angle of the water droplets, and the hydrophobicity or water repellency increases in proportion to the increase in the contact angle of the water droplets.

Specifically, the second one-side angle 21 and the second other-side angle 22 refer to values derived by repeatedly measuring the contact angle of water droplets applied to the vehicle surface 20 on which a coating film is formed and the applied contact angle a specified number of times.

The second one-side angle 21 refers to the angle formed between a third tangent line that contacts one side of the water droplet applied to the vehicle surface 20 on which the coating film is formed and the part of the vehicle surface 20 to which the water droplet is in close contact.

The second other side angle 22 refers to the angle formed between the fourth tangent line that contacts the other side of the water droplet applied to the vehicle surface 20 on which the coating film is formed and the part of the vehicle surface 20 to which the water droplet is in close contact.

Here, the third tangent line refers to a line that extends a predetermined distance in a straight line away from the vehicle surface 20 while being in contact with a portion of the surface of the water droplet adjacent to one side edge of the contact surface where one side edge of the water droplet and the vehicle surface 20 meet when viewed from the side of the water droplet.

The fourth tangent line refers to a line that extends a predetermined distance in a straight line away from the vehicle surface 20 while in contact with a portion of the surface of the waterdrop adjacent to the other end of the contact surface where the waterdrop and the vehicle surface 20 meet when viewed from the side.

The vehicle surface 20 on which the coating film is formed is created by a process of cleaning and coating the vehicle surface 20 through the following steps: (1) pre-wash (high-pressure water washing), (2) application of snow foam or car shampoo, (3) shampooing or snow foam mitt application, (4) spraying of a vehicle wet coating agent, (5) pre-wash (high-pressure water washing), and (6) water removal, after which the contact angle is measured using a contact angle measuring device.

Referring to Table 1, it can be seen that the derived values of the second one-side angle 21 and the second other-side angle 22 change depending on the number of measurements. In particular, it can be seen that the second one-side angle 21 and the second other-side angle 22 measured later are relatively higher than the second one-side angle 21 and the second other-side angle 22 measured earlier.

It can be confirmed that regardless of the number of measurements, the values of the second one-side angle 21 and the second other-side angle 22 measured using a single, identical water droplet measured with a contact angle measuring device show a deviation of 0.1 to 0.8°.

Furthermore, referring to Table 1, the second one-side angle 21 and the second other-side angle 22 measured on the vehicle surface 20 on which the coating film is formed are each relatively higher than the first one-side angle 11 and the first other-side angle 12 measured at all measurements, confirming that the hydrophobicity of the coating film coated on the vehicle surface 20 is relatively higher than the hydrophobicity of the coating film formed on the vehicle surface 10.

Furthermore, in the case of a vehicle surface 20 on which a coating film is formed, it can be confirmed that the second one-side angle 21 and the second other-side angle 22 measured at a later stage of the measurement are relatively higher than the second one-side angle 21 and the second other-side angle 22 measured at an earlier stage of the measurement. This confirms that the hydrophobic or water-repellent properties of the vehicle surface 20 are effectively maintained even when the vehicle surface 20 is repeatedly exposed to water droplets or moisture for a long period of time.

Referring to Table 2 and the attached Figures 5 and 6, the friction coefficients disclosed in Table 2 are values measured using a friction coefficient measuring device (product name: WL2100C, manufactured by WITHLAB Co., Ltd.) according to ASTM D 1894 method, for the friction coefficients of a vehicle surface 10 on which no coating film was formed and a vehicle surface 20 on which a coating film was formed.

The friction coefficient measuring device includes a slide member 52 that is in close contact with the vehicle surface 10, 20, a weight 54 that is in close contact with or connected to the upper part of the slide member 52, a wire 56 that is connected at one end to the weight 54 and at the other end to a load cell 58, and the load cell 58.

The static friction coefficient refers to the friction coefficient measured as the maximum value by the load cell 58 from the time when the slide member 52, wire 56, and load cell 58, which are in close contact with the vehicle surface 10, 20 on which no coating film is formed, begin to be pulled in a first direction until the slide member 52 begins to move in the first direction.

In other words, the static friction coefficient refers to the maximum value of frictional force until the slide member 52, wire 56, and load cell 58 begin to move in the first direction, and indicates a high value when the slipperiness of the vehicle surfaces 10, 20 is low.

The dynamic friction coefficient indicates the frictional force generated between the slide member 52 and the vehicle surfaces 10, 20 when the slide member 52, which is in close contact with the vehicle surfaces 10, 20 on which no coating film is formed, moves in the first direction.

Referring to Figure 6, the static friction coefficient 63 is a graph in which the X axis represents the force 60 applied to the slide member 52 and the Y axis represents the friction force 61, and shows the maximum static friction force when the static friction force 62 increases to its maximum in the section 64 in which the slide member 52 is stopped.

The dynamic friction coefficient 65 is a graph in which the X-axis represents the friction force 60 applied to the sliding member 52 and the Y-axis represents the friction force 61, and represents the friction force generated between the vehicle surfaces 10, 20 and the sliding member 52 when the sliding member 52 is in a motion state 66.

Referring to Table 1, it can be seen that the static friction coefficient 63 of the vehicle surface 10 on which no coating film has been formed is relatively lower than the dynamic friction coefficient 65 measured immediately after each measurement of the static friction coefficient 63, regardless of the number of measurements, confirming that the vehicle surface 10 has low slipperiness or slickness.

Furthermore, since each of the static friction coefficients 63 of the vehicle surface 10 shows a relatively higher value than each of the static friction coefficients 63 measured on the vehicle surface 20 on which the coating film is formed, it can be confirmed that the slipperiness of the vehicle surface 10 is significantly lower than the slipperiness of the vehicle surface 20.

Furthermore, each of the static friction coefficients 63 on the vehicle surface 10 shows a relatively higher value than each of the static friction coefficients 63 measured on the vehicle surface 20 on which the coating film is formed, confirming that the adhesive strength of the vehicle surface 10 is relatively higher than the adhesive strength of the vehicle surface 20, thereby confirming that the probability of foreign matter adhering to the vehicle surface 20 is reduced and that the anti-fouling properties are improved.

Furthermore, since each of the dynamic friction coefficients 65 of the vehicle surface 10 shows a relatively higher value than each of the dynamic friction coefficients 65 measured on the vehicle surface 20 on which the coating film is formed, it can be confirmed that the slipperiness of the vehicle surface 10 is significantly lower than the slipperiness of the vehicle surface 20.

In addition, each static friction coefficient 63 measured on the vehicle surface 20 on which the coating film is formed is relatively higher than the dynamic friction coefficient 65 measured immediately after each static friction coefficient 63 measurement, regardless of the number of measurements, confirming that the sliding member 52 slides easily along the vehicle surface 20 and that the vehicle surface 20 has excellent slip and slick properties.

Meanwhile, the vehicle wet coating agent may further include a UV blocker, which may be composed of a core made of spherical silicone elastomer beads and a shell made of nano-sized titanium dioxide (TiO ₂ ) particles and additives, and the additives may be at least one selected from the group consisting of dispersants, coupling agents, and organic and inorganic composite sols (binders).

Here, the dispersant and binder are used to modify the surface of the silicone elastomer so that the titanium dioxide coating layer is uniformly formed and adheres to the surface of the silicone elastomer beads.

The binder is an aminoalkylsilane-based substance, and non-limiting examples include 3-aminopropyltriethoxysilane, 3-aminopropyltrimethoxysilane, and 3-2-aminoethylaminopropyltriethoxysilane.

The dispersant is one or more selected from the group consisting of citric acid, malic acid, maleic acid, fumaric acid, succinic acid, acetic acid, formic acid, butanoic acid, hydrochloric acid, and nitric acid, and the conjugate is one or more selected from the group consisting of 3-aminopropyltriethoxysilane, 3-aminopropyltrimethoxysilane, and 3-(2-aminoethyl)aminopropyltriethoxysilane.

Specifically, the titanium dioxide (TiO ₂ ) slurry used in the production of the UV blocker is prepared by dispersing 75.12 wt % (45.58 g) of lipophilic surface-treated titanium dioxide powder (MT-100SJ, particle size approximately 20 nm) in ethanol in a reaction vessel to prepare a slurry, adding 4.04 wt % (2.45 g) of citric acid as a dispersant while heating to 55°C, and stirring for 2 hours. Thereafter, 20.85 wt % (12.65 g) of organic and inorganic composite sol as a binder is added, and stirring is continued for 1 to 2 hours to prepare the surface-treated titanium dioxide (TiO ₂ ) slurry.

The vehicle wet coating agent is used periodically to convert into a coating film on the vehicle glass, and the coating film can be formed in multiple layers. Since at least this amount of titanium dioxide powder produces a sufficient UV blocking effect, it is preferable that the amount of titanium dioxide powder contained in the titanium dioxide slurry be 75.12 wt % (45.58 g) or less.

The first step in preparing the organic and inorganic composite sol involves adding 9% by weight (30 g) of boehmite powder to 90.01% by weight (300 g) of purified water and stirring to prepare a slurry for the composite sol, then adding 0.99% by weight (3.3 g) of acetic acid and stirring at room temperature for 1 hour.

In the second process for producing the organic and inorganic composite sol, the stirred composite sol slurry is heated to 70°C and reacted for 2 hours, cooled to room temperature, and then purified water is added to the mixture to a total weight of 300 g to synthesize the alumina sol.

The third process for producing the organic and inorganic composite sol involves adding 8.1 wt% (39 g) of acetic acid solution to 20.07 wt% (130 g) of 3-glycidoxypropyltrimethoxysilane (GPS), stirring at room temperature for 1 hour, and then adding 64.88 wt% (312.2 g) of the alumina sol while heating to 70°C. The mixture is then heated and reacted for 4 hours to complete the organic and inorganic composite sol.

When the organic and inorganic composite sol is dried at 100°C, it forms a transparent film, which is insoluble in water or ethanol and can therefore be used as a binder.

Then, in a separate reaction vessel, 13.86 wt% (32.19 g) silicone elastomer beads (SB902) were added to 86.14 wt% (200 g) purified water and stirred for a specified period of time to produce an aqueous dispersion.

In another reaction vessel, 14.37 wt% (50 g) of ethanol and 1.44 wt% (5 g) of purified water are added and heated to about 55°C while stirring, and the titanium dioxide ( _TiO2 ) slurry and aqueous dispersion are slowly and simultaneously added to cause co-precipitation. After co-precipitation is complete, the mixture is heated for an additional hour and cooled to room temperature. When a precipitate layer is formed at the bottom, the supernatant liquid is discharged.

After filtering the liquid contained in the precipitate using filter paper, the precipitate is dried at 60°C, pulverized using dry ball milling, and passed through a 200 mesh sieve to produce a composite powder UV blocker.

The additive is one or more selected from the group consisting of dispersants, binders, and organic and inorganic composite sols, and is preferably added during the steps of preparing the titanium dioxide slurry, preparing the aqueous dispersion, and preparing the composite powder-type UV blocker.

The completed wet coating agent for vehicles containing the UV blocker has a low chance of skin penetration even if it accidentally comes into contact with the skin, and exhibits high SPF and PA values, providing excellent UV blocking effects.

In addition, the silicone elastomer used as the core component of the UV blocker is soft to the touch, which has the advantage of preventing scratches or damage to the vehicle surface when the wet coating agent for vehicles is sprayed onto the vehicle surface.

The vehicle wet coating agent may further include a light-reflecting composition, which is a coating composition including organosilane-functionalized colloidal silica and hollow microspheres. The organosilane-functionalized colloidal silica includes silica particles having one or more organosilane moieties bonded to the surface of the silica particles, and the hollow microspheres include a polymeric shell.

Specifically, organosilane-functionalized colloidal silica can be prepared by the method described in WO 2004/035473 and is generally formed by the reaction of one or more organosilane reactants, which can be represented by the formula T _4-y Si—[R ¹ ] _y , with one or more silanol groups, i.e., [SiO ₂ ]—OH groups, on the silica surface, resulting in the attachment of one or more organosilane moieties to the silica surface.

In the organosilane reactant, each T is typically independently selected from C1-6 alkoxy, C1-6 haloalkoxy, hydroxy, and halide. Another option is the use of siloxanes, such as siloxanes of the formula [R1] _{bT3 -} bSi{—O—SiT2 _-c [ ^R1 ]c}a-O—SiT3 _-b [ ^R1 ]b, where a is an integer of 0 or greater, typically 0 to 5, b is 1 to 3, and c is 1 to 2.

Other examples include disilazanes of the formula {[R ¹ ] _b T _3-b Si} ₂ —NH, where b is 1 to 3 and, among the haloalkoxy groups, fluoro and chloro are preferred halo substituents.

Alkoxy groups and halides are often preferred as the T species; among halides, chloride is a good choice; among alkoxy groups, the C1-4 alkoxy groups methoxy, ethoxy, propoxy, or isopropoxy are good choices.

The organosilane reactant can undergo a prehydrolysis step in which one or more T groups are converted to -OH as described in Greenwood and Gevert, Pigment and Resin Technology, 2011, 40(5), pp. 275-284.

Organosilanes include epoxyalkylsilanes or epoxyalkyloxyalkylsilanes, which contain epoxy groups that can be hydrolyzed to form the corresponding vicinal diol groups.

More than one different organosilane can be present in the functionalized colloidal silica, and organosilane-functionalized silica can be produced by mixing two or more separately prepared organo-functionalized colloidal silicas by reacting a mixture of two or more organosilanes and colloidal silica.

Organosilane-functionalized colloidal silica particles exhibit safety without substantial gelation or precipitation for at least two to four months when stored normally at room temperature.

Compared to coating films that do not contain organosilane-modified colloidal silica, coating films containing organosilane-modified colloidal silica offer relatively improved tear resistance, tensile strength, electromagnetic radiation reflectance in the wavelength range of 280-2500 nm, resistance to contamination adsorption by hydrophobic and hydrophilic substances (fouling resistance), and storage safety.

The microspheres contained in the light-reflecting composition are hollow, which improves the visible and near-infrared reflectance of the light-reflecting composition. It is preferable to use expandable microspheres with expanded hollow cores.

Expandable microspheres are produced by heating a thermoplastic polymeric shell encapsulating one or more volatile fluids, causing the volatile fluids to expand and correspondingly expand the microspheres.

The expandable microspheres included in the light-reflecting composition have an average diameter of 300 to 500 μm; non-expandable microspheres can also be included in the light-reflecting composition; examples of suitable microspheres are described in WO 2007/073318 and sold under the trade name Expancel ^™ .

The microspheres contained in the light-reflecting composition have the advantage of improving the storage safety and durability of the coating film containing the light-reflecting composition, as well as the light reflectance and wet adhesion rate for light in the wavelength range of 280 to 2500 nm.

The light-reflecting composition therefore has the advantage that the wet adhesion rate is improved by the contained microspheres, and when sprayed onto the surface of a vehicle together with a vehicle wet coating agent, it is stably coated onto the vehicle surface.

When a light-reflecting composition containing microspheres and organosilane-functionalized colloidal silica is incorporated into a vehicle wet coating agent and coated onto the surface of a vehicle, it improves long-term durability, tensile strength, light reflectance, wet adhesion, and anti-fouling properties.

The light-reflecting composition may further contain an organic binder, which is one or more organic binders selected from the group consisting of water-soluble resins and water-soluble polymers.

Water-soluble resins and polymers include poly(vinyl alcohol), modified poly(vinyl alcohol), polycarboxylates, poly(ethylene glycol), poly(propylene glycol), polyvinylpyrrolidone, polyallylamine, polyacrylic acid, polyamidoamine, polyacrylamide, and polypyrrole.

When a wet coating agent for vehicles containing a light-reflecting composition is sprayed onto the surface of a vehicle, a coating film is formed, and when this coating film is applied to the surface of the vehicle's glass, it has the advantage of reflecting light in the wavelength range of 280 to 2500 nm.

<Example 1>

The first mixture is prepared by stirring 1-5% by weight of decamethylcyclopentasiloxane, 42-55% by weight of purified water, 5-10% by weight of an alcohol-based nonionic surfactant, and 40-50% by weight of amodimethicone oil at 50-100 rpm for 9.5 to 18.5 hours.

Next, 0.5 to 2 wt. % of trifluoropropyltrimethoxysilane, a fluorine-based alkoxysilane, is added to the first mixture and stirred at 50 to 100 rpm for 5 to 10 hours to produce a second mixture.

Next, 1 to 23% by weight of purified water is added to the second mixture and stirred at 50 to 100 rpm for 3 to 8 hours to produce a third mixture. The third mixture is then packaged or poured into a container to complete the wet coating agent for vehicles.

<Example 2>

The first mixture is prepared by stirring 1-5% by weight of decamethylcyclopentasiloxane, 42-55% by weight of purified water, 5-10% by weight of an alcohol-based nonionic surfactant, and 40-50% by weight of amodimethicone oil at 50-100 rpm for 7.5 to 16.5 hours.

Next, 0.5 to 2% by weight of triethoxyoctylsilane, a fluorine-based silane, is added to the first mixture and stirred at 50 to 100 rpm for 3 to 7 hours to produce a second mixture.

Next, 1 to 23% by weight of purified water is added to the second mixture and stirred at 50 to 100 rpm for 3 to 6 hours to produce a third mixture. The third mixture is then packaged or poured into a container to complete the wet coating agent for vehicles.

The triethoxyoctylsilane contained in the vehicle wet coating agent has the advantage of forming a hydrophobic layer on the vehicle surface when the vehicle wet coating agent forms a coating film on the vehicle surface, improving the hydrophobicity, water repellency, oxidation resistance, base resistance, and corrosion resistance of the coating film.

In addition, the triethoxyoctylsilane contained in the vehicle wet coating agent improves the mixing and dispersion of the first mixture within the vehicle wet coating agent formed as a polymer, which has the advantage of shortening the manufacturing time compared to the manufacturing time for the vehicle wet coating agent of Example 1.

<Example 3>

The first mixture is prepared by stirring 1-5% by weight of decamethylcyclopentasiloxane, 42-55% by weight of purified water, 5-10% by weight of an alcohol-based nonionic surfactant, and 40-50% by weight of amodimethicone oil at 50-100 rpm for 9.5 to 18.5 hours.

Next, 0.5 to 1% by weight of trichlorosilane, a fluorine-based alkoxysilane, is added to the first mixture and stirred at 50 to 100 rpm for 5 to 10 hours to produce a second mixture.

Next, 1 to 23% by weight of purified water is added to the second mixture and stirred at 50 to 100 rpm for 3 to 8 hours to produce a third mixture. The third mixture is then packaged or poured into a container to complete the wet coating agent for vehicles.

The trichlorosilane contained in the vehicle wet coating agent is a cross-linkable silane compound, and when mixed with decamethylcyclopentasiloxane containing silica particles, it has the advantage of preventing the agglomeration of decamethylcyclopentasiloxane and improving the mixing and dispersion effects of the second mixture.

As a result, when the vehicle wet coating agent containing trichlorosilane is converted into a coating film on the vehicle surface, the thickness of the coating film becomes uniform, and there is an advantage that a coating film can be formed on the vehicle surface of the same area with a relatively smaller amount of vehicle wet coating agent than the vehicle wet coating agents of Examples 1 and 2.

<Example 4>

Prior to performing the first stirring step (S110), nitrogen gas is injected into the reaction vessel to fill the interior of the reaction vessel with nitrogen, and once the interior of the reaction vessel is filled with nitrogen, a nitrogen injection step (S105) is performed to stop the injection of nitrogen.

The first mixture is prepared by stirring 1-5 wt% decamethylcyclopentasiloxane, 2-5 wt% of the UV blocker, 40-50 wt% purified water, 5-10 wt% alcohol-based nonionic surfactant, and 40-50 wt% amodimethicone oil at 50-100 rpm for 4.5 to 13.5 hours.

Next, 0.5 to 2% by weight of trifluoropropyltrimethoxysilane, a fluorine-based alkoxysilane, is added to the first mixture and stirred at 50 to 100 rpm for 2 to 6 hours to produce a second mixture.

Next, 1 to 23% by weight of purified water is added to the second mixture and stirred at 50 to 100 rpm for 1 to 4 hours to produce a third mixture. The third mixture is then packaged or poured into a container to complete the wet coating agent for vehicles.

The UV blocking agent contained in the vehicle wet coating agent has the advantage of blocking ultraviolet rays from entering the vehicle interior through the glass when the vehicle wet coating agent forms a coating film on the vehicle's glass surface.

In addition, the vehicle wet coating agent produced in Example 4 is produced inside a reaction tank filled with nitrogen, which has the advantage that decamethylcyclopentasiloxane, UV blocker, purified water, alcohol-based nonionic surfactant, amodimethicone oil, and trifluoropropyltrimethoxysilane are stably mixed and reacted in the first stirring step (S110), second stirring step (S120), and third stirring step (S130).

Furthermore, since the vehicle wet coating agent produced in Example 4 is stably produced inside a nitrogen-filled reaction tank, the production time for the vehicle wet coating agent is advantageously shorter than the production time for each of the vehicle wet coating agents produced in Examples 1 to 3.

Meanwhile, the UV blocker comprises a core made of spherical silicone elastomer beads and a shell made of nano-sized titanium dioxide particles and additives, the additives being at least one selected from the group consisting of dispersants, binders, and organic and inorganic composite sols. Specific methods for manufacturing the UV blocker have been described above, so redundant explanations will be omitted.

In addition, in Example 4, triethoxyoctylsilane can be used instead of trifluoropropyltrimethoxysilane. In this case, the first mixture can be produced by stirring at 50-100 rpm for 4 to 13 hours in the first stirring stage, the second mixture can be produced by stirring at 50-100 rpm for 1 to 5 hours in the second stirring stage, and the third mixture can be produced by stirring at 50-100 rpm for 1 to 3 hours in the third stirring stage.

<Example 5>

Prior to performing the first stirring step (S110), nitrogen gas is injected into the reaction vessel to fill the interior of the reaction vessel with nitrogen, and once the interior of the reaction vessel is filled with nitrogen, a nitrogen injection step (S105) is performed to stop the nitrogen injection.

The first mixture is prepared by stirring 1-5 wt% decamethylcyclopentasiloxane, 2-5 wt% of the UV blocker, 35-48 wt% purified water, 5-10 wt% alcohol-based nonionic surfactant, and 40-50 wt% amodimethicone oil at 50-100 rpm for 4.5 to 13.5 hours.

Next, 0.5 to 2% by weight of trifluoropropyltrimethoxysilane, a fluorine-based alkoxysilane, is added to the first mixture and stirred at 50 to 100 rpm for 2 to 6 hours to produce a second mixture.

Next, 1 to 23% by weight of purified water is added to the second mixture, and the mixture is stirred at 50 to 100 rpm for 1 to 4 hours to produce a third mixture.

Next, 3.5 to 5.5 wt. % of a light-reflecting composition is added to the third mixture and stirred to produce a fourth mixture, which is then packaged or poured into a container to complete the wet coating agent for vehicles.

The UV blocking agent contained in the vehicle wet coating agent has the advantage of blocking ultraviolet rays from entering the vehicle interior through the glass when the vehicle wet coating agent forms a coating film on the vehicle's glass surface.

In addition, the vehicle wet coating agent produced in Example 5 is produced inside a reaction tank filled with nitrogen, which has the advantage that decamethylcyclopentasiloxane, UV blocker, purified water, alcohol-based nonionic surfactant, amodimethicone oil, and trifluoropropyltrimethoxysilane are stably mixed and reacted in the first stirring step (S110), second stirring step (S120), and third stirring step (S130).

Furthermore, the vehicle wet coating agent produced in Example 5 is stably produced inside a nitrogen-filled reaction tank, which has the advantage that the production time for the vehicle wet coating agent is relatively shorter than the production time for each of the vehicle wet coating agents produced in Examples 1 to 3.

Meanwhile, the UV blocker is composed of a core made of spherical silicone elastomer beads and a shell made of nano-sized titanium dioxide particles and additives, and the additives are at least one selected from the group consisting of dispersants, binders, and organic and inorganic composite sols. Specific methods for manufacturing the UV blocker have been described above, so redundant explanations will be omitted.

The light-reflecting composition is a coating composition comprising organosilane-functionalized colloidal silica and hollow microspheres. The organosilane-functionalized colloidal silica comprises silica particles having one or more organosilane moieties bonded to the surface of the silica particles, and the hollow microspheres comprise a polymeric shell. Specific methods for producing the light-reflecting composition have been described above, so redundant description will be omitted.

The wet coating agent for vehicles produced in Example 5 is produced inside a nitrogen-filled reactor, which has the advantage of reducing overall production time and costs and reducing the defect rate.

In addition, when the wet coating agent for vehicles is sprayed onto the surface of the vehicle glass, the coating film that is formed contains UV blocking agents, which effectively blocks ultraviolet rays that are harmful to the human body, providing the advantage of protecting the bodies of occupants seated inside the vehicle.

In addition, when the vehicle wet coating agent is sprayed onto the surface of a vehicle glass, the coating film formed contains a light-reflective composition, which effectively blocks light from entering the vehicle surface, the vehicle glass surface, or the interior of the vehicle. This has the advantage of significantly reducing heat generation caused by temperature increases on the vehicle surface and inside the vehicle compared to coating films formed using the vehicle wet coating agents produced in Examples 1 to 4 under the same environment.

Preferred embodiments of the present invention have been described above with reference to the accompanying drawings. However, it should be understood that the embodiment described in this specification and the configurations shown in the drawings are merely the most preferred embodiment of the present invention and do not fully represent the technical concepts of the present invention. Therefore, it should be understood that there are various equivalents and modifications that can replace them at the time of filing this application. Therefore, it should be understood that the embodiment described above is illustrative in all respects and not limiting. The scope of the present invention is determined by the claims below rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being within the scope of the present invention.

100. Manufacturing method for wet coating agents for vehicles

Claims (7)

A wet coating agent for vehicles containing decamethylcyclopentasiloxane, purified water, an alcohol-based nonionic surfactant, amodimethicone oil, and a fluorine-based silane. The wet coating agent for vehicles described in claim 1, characterized in that it contains 1 to 5 wt% of decamethylcyclopentasiloxane, 43 to 78 wt% of purified water, 5 to 10 wt% of the alcohol-based nonionic surfactant, 40 to 50 wt% of the amodimethicone oil, and 0.5 to 2 wt% of the fluorine-based silane. A first stirring step of stirring decamethylcyclopentasiloxane, purified water, an alcohol-based nonionic surfactant, and amodimethicone oil to prepare a first mixture;
a second stirring step of adding a fluorine-based silane to the first mixed solution to prepare a second mixed solution;
and a third stirring step of adding purified water to the second mixed solution to prepare a third mixed solution. The method for producing a wet coating agent for vehicles described in claim 3, wherein the first stirring step involves stirring 1 to 5 wt. % of the decamethylcyclopentasiloxane, 42 to 55 wt. % of the purified water, 5 to 10 wt. % of the alcohol-based nonionic surfactant, and 40 to 50 wt. % of the amodimethicone oil. The method for producing a wet coating agent for vehicles according to claim 4, wherein the second stirring step involves adding 0.5 to 2 wt % of the fluorine-based silane and stirring. The method for manufacturing a wet coating agent for vehicles according to claim 5, wherein the third stirring step further comprises adding 1 to 23 wt. % of purified water and stirring. The method for manufacturing a wet coating agent for vehicles described in claim 6, wherein the fluorine-based silane is trifluoropropyltrimethoxysilane.