Wet coating agent for vehicles and its manufacturing method

Abstract

To provide a wet coating agent for a vehicle and a method for producing the same, with which a surface of a vehicle is conveniently coated by spraying onto the vehicle and rinsing with high-pressure water.SOLUTION: Provided is a wet coating agent for a vehicle containing decamethylcyclopentasiloxane, purified water, an alcohol-based nonionic surfactant, amodimethicone oil, and a fluorinated silane.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a wet coating agent for vehicles and a manufacturing method thereof, and more particularly to a wet coating agent for vehicles that can conveniently coat the surface of a vehicle and a manufacturing method thereof. [Background technology]

[0002] Unless otherwise indicated herein, the subject matter described in this identification section is not prior art to the claims of this application and is not admitted to be prior art by virtue of being mentioned in this identification section.

[0003] The paint coated on the surface of a vehicle is easily contaminated and damaged because it is continuously exposed to foreign objects generated on the road, changes in external temperature and humidity, and rain and snow generated by weather changes.

[0004] 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.

[0005] However, since the task of coating vehicle paint using existing coating agents is quite difficult, there is a need to develop a product that allows vehicle users, who are not professional installers, to conveniently and easily coat vehicle paint.

[0006] In this regard, Patent Document 1 discloses a glossy coating agent for automobiles with enhanced cleaning and coating functions and a method for manufacturing the same, and Patent Document 2 discloses a glossy coating agent for automobiles and a method for manufacturing the same.

[0007] However, the existing inventions do not disclose any technology related to a wet coating agent that allows even a user with little experience in coating to easily apply the coating agent to the surface of a vehicle. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] Korean Patent Registration No. 10-2508223 [Patent Document 2] Korean Patent Registration No. 10-2482458 Summary of the Invention [Problem to be solved by the invention]

[0009] An object of the present specification is to provide a wet coating agent for vehicles that can be easily applied to the surface of a vehicle by spraying the agent onto the vehicle and rinsing with high-pressure water, and a method for producing the same.

[0010] Furthermore, it is clear that the present specification is not limited to the technical problems described above, and other technical problems may be derived from the following description. [Means for solving the problem]

[0011] 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.

[0012] The vehicle wet coating agent may contain 1 to 5 wt % of the 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 the fluorine-based silane.

[0013] According to another embodiment of the disclosed subject matter, a method for manufacturing 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 prepare a first mixed solution, 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.

[0014] In addition, 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.

[0015] In addition, the second stirring step may include adding 0.5 to 2 wt % of the fluorine-based silane and stirring.

[0016] In addition, in the third stirring step, 1 to 23 wt % of the purified water may be further added and stirred.

[0017] The fluorine-based silane may be trifluoropropyltrimethoxysilane. [Effects of the Invention]

[0018] 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.

[0019] In addition, the wet coating agent for vehicles can be applied not only to the surface of a vehicle but also to the surfaces of wheels, glass, metals, and polymer materials attached to the vehicle, and is therefore effective in protecting the surfaces of various parts attached to the vehicle.

[0020] In addition, the present wet coating agent for vehicles is coated on the surface of a vehicle to form a coating film, which has the advantages of maintaining the vehicle's inherent color and transparency, and improving the slickness, slipperiness, hydrophobicity, and water repellency of the vehicle surface.

[0021] In addition, the wet coating agent for vehicles has the advantage of forming a coating film not only on the painted surface formed on the surface of a vehicle, but also on all parts of the vehicle, including wheels, glass, metals, and polymer exterior materials.

[0022] Furthermore, the effects of the present invention as described above are naturally exhibited by the configuration of the described contents, regardless of whether the inventors recognize them or not, and therefore the above-mentioned effects are merely some of the effects of the described contents and should not be recognized as describing all the effects that the inventors recognize or actually have. Furthermore, the effects of the present invention must be further understood from the overall description in the specification, and even if not explicitly described, if a person skilled in the art to which the described contents pertains would recognize such an effect from the specification, it should be considered as an effect described in the specification. [Brief explanation of the drawings]

[0023] [Figure 1] 1 is a flowchart of a method for manufacturing a wet coating agent for vehicles according to an embodiment of the present specification. [Figure 2] 2 is a diagram showing components contained in a first mixed solution mixed in a first stirring step in the method for producing a wet coating agent for vehicles of FIG. 1. FIG. [Figure 3]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, in the method for producing a wet coating agent for a vehicle of FIG. 1; [Figure 4] 2 is a schematic diagram showing a contact angle measurement state performed to analyze the hydrophilicity of a coating film formed on the surface of a vehicle by the wet coating agent for a vehicle of FIG. 1. FIG. [Figure 5] 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. [Figure 6] 1 is a graph illustrating the concept of coefficient of friction. DETAILED DESCRIPTION OF THE INVENTION

[0024] The structure, operation, and effects of a wet coating agent for vehicles and a manufacturing method thereof according to a preferred embodiment will now be described with reference to the accompanying drawings. For reference, in the following drawings, each component is omitted or illustrated schematically for convenience and clarity, and the size of each component does not reflect the actual size. Also, the same reference numerals refer to the same components throughout the specification, and the same reference numerals are omitted for the same components in each drawing.

[0025] Referring to FIGS. 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.

[0026] Fluorine-based alkoxysilane is a composition included in the category of fluorine-based silane, and fluorine-based silane includes (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 (Sulfonic acid). acid).

[0027] The wet coating agent for vehicles is sprayed onto the surface of a vehicle that is still wet or has been dehydrated, and then spreads over the surface of the vehicle using high-pressure water to form a coating film on the surface of the vehicle. The coating film improves the water repellency, slickness, hydrophobicity, slip resistance, durability, and stain resistance of the vehicle surface.

[0028] 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 splashed out by the coating film.

[0029] 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.

[0030] 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 vehicle wet coating agent applied to the vehicle, reduces the coefficient of friction, and has the advantage of improving the coating work speed due to its high volatility.

[0031] In addition, the amodimethicone oil contained in the vehicle wet coating agent is a silicone polymer whose terminal is substituted with an amino functional group, and when the vehicle wet coating agent is sprayed onto the surface of a vehicle, it is contained in the formed coating film, which has the advantage of protecting the surface of the vehicle.

[0032] 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 coated on the surface of the vehicle due to the low surface energy of fluorine itself.

[0033] Fluorine has high electron density, the second smallest atomic radius after hydrogen, and high electronegativity, which allows it to form a strong carbon-fluorine bond. Due to these characteristics of fluorine, monomers containing perfluoroalkyl groups exhibit extreme hydrophobicity with a critical surface tension of 5-10 dynes / cm.

[0034] In addition, fluorine-coated products have the advantages of being less susceptible to the chemical environment, having high heat resistance, insulating properties, surface resistivity, abrasion resistance, acid resistance, and base resistance, and being easy to clean.

[0035] Referring to FIG. 1, a 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.

[0036] 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).

[0037] 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.

[0038] In a first stirring step (S110), 1 to 5 wt % of decamethylcyclopentasiloxane, 42 to 55 wt % of purified water, 5 to 10 wt % of an alcohol-based nonionic surfactant, and 40 to 50 wt % of amodimethicone oil are stirred in a reaction vessel to prepare a first mixture (step S110).

[0039] Specifically, in the first stirring step (S110), 1 to 5 wt % of decamethylcyclopentasiloxane, 42 to 55 wt % of purified water, 5 to 10 wt % of an alcohol-based nonionic surfactant, and 40 to 50 wt % of amodimethicone oil are stirred at 50 to 100 rpm for 9.5 to 18.5 hours (step S110).

[0040] Referring to FIGS. 1 and 3, in a second stirring step (S120), 0.5 to 2 wt % of trifluoropropyltrimethoxysilane (TFPTMS), a type of fluorine-based alkoxysilane, is added to the first mixture in a reaction vessel and stirred to prepare a second mixture (step S120).

[0041] Specifically, in a 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 the mixture is stirred at 50 to 100 rpm for 5 to 10 hours (step S120).

[0042] Referring to FIGS. 1 and 3, in the third mixing step (S130), 1 to 23 wt. % of purified water is further added to the second mixed solution and mixed to prepare a third mixed solution, and the third mixed solution is poured into a container or packaged to complete the wet coating agent for vehicles (step S130).

[0043] Specifically, in a third stirring step (S130), 1 to 23 wt % of purified water is added to the second mixture, and the mixture is stirred at 50 to 100 rpm for 3 to 8 hours to prepare a third mixture (step S130).

[0044] Meanwhile, 1 to 23 wt% of purified water added in the third stirring step (S130) may be added to the reaction vessel together with 42 to 55 wt% of purified water added in the first stirring step (S110), where the amount of purified water may be 43 to 78 wt%.

[0045] Decamethylcyclopentasiloxane is included in vehicle wet coating agents to improve the slickness, slipperiness, strength, and gloss durability of the coating film applied to the surface of a vehicle, as well as to enhance the effect of preventing micro-scratching. It also has the advantage of reducing stickiness when the coating film comes into contact with the skin.

[0046] In addition, 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 has the advantage of improving the coating work speed due to its high volatility.

[0047] In addition, decamethylcyclopentasiloxane, when contained 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.

[0048] In addition, silicon (Si) contained in decamethylcyclopentasiloxane has low surface tension and reduces the coefficient of friction, so there is an advantage that the coefficient of friction of the coating film coated on the surface of a vehicle using a wet coating agent for vehicles containing decamethylcyclopentasiloxane is reduced.

[0049] The alcohol-based nonionic surfactant functions to effectively mix the fluorine-based alkoxysilane added in the second stirring step (S120) with the purified water, and the content of the alcohol-based nonionic surfactant is preferably 5 to 10 wt %.

[0050] In addition, the alcohol-based nonionic surfactant has the advantage of allowing the silicone-based polymer amodimethicone oil and the fluorine-based alkoxysilane to be effectively mixed with each other.

[0051] The alcohol-based nonionic surfactant emulsifies the amodimethicone oil and decamethylcyclopentasiloxane, allowing the amodimethicone oil and decamethylcyclopentasiloxane to mix effectively.

[0052] Furthermore, by including an alcohol-based nonionic surfactant in the first mixed liquid, the particle sizes of the amodimethicone oil and the fluorine-based alkoxysilane are formed to be relatively smaller than when the alcohol-based nonionic surfactant is not included in the first mixed liquid.

[0053] In addition, since the particle size of the amodimethicone oil and the fluorine-based alkoxysilane is small, when the vehicle wet coating agent produced after the third stirring step (S130) is coated on the surface of the 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.

[0054] In addition, the particle size of the amodimethicone oil and the fluorine-based alkoxysilane is reduced by the alcohol-based nonionic surfactant and stirring, which has the advantage that even if the wet coating agent for vehicles is applied to a vehicle surface with water or shampoo ingredients remaining thereon during the vehicle washing process, a coating film with excellent stain resistance, hydrophobicity, water repellency and durability can be formed.

[0055] For example, the typical process of 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 coating agent for vehicles, (7) buffing (wiping) the hardened applied area with a towel, and (8) waiting a specified amount of time until the applied area has hardened.

[0056] 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 surface of the vehicle even when the wet coating agent for vehicles is applied to the surface of the vehicle while water or shampoo ingredients remain on the surface of the vehicle. 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 work, (4) spraying the wet coating agent for vehicles, (5) pre-wash (high-pressure water washing), and (6) removing water.

[0057] Meanwhile, the content of the alcohol-based nonionic surfactant in the first mixed solution is preferably 5% by weight to 10% by weight, whereby the particle size of the amodimethicone oil or the fluorine-based alkoxysilane is processed to be relatively small, the content of the amodimethicone oil or the fluorine-based alkoxysilane is maintained at an appropriate level, and the physical properties of the coating film are stably maintained.

[0058] The alcohol-based nonionic surfactant contained in the first mixed solution includes polyethylene glycol tridecyl ether and ethoxylated propoxylated alcohols ((C=11-14)-iso-, (C=13)-rich, ethoxylated propoxylated alcohols), of which ethoxylated propoxylated alcohols are preferred.

[0059] Amodimethicone oil (amodimethicone) is a type of siloxane polymer or silicone polymer whose terminal is substituted with an amino functional group. It has excellent emulsifying properties, increases the solubility of various ingredients, and also functions as an antifoaming agent, which prevents the formation of unnecessary voids in the coating film and allows for the creation of a relatively smooth surface.

[0060] In addition, amodimethicone oil forms a coating film on the surface of the vehicle to protect the surface from external stimuli, improves hydrophobicity, water repellency and slipperiness due to the low surface tension of silicone itself, and has the advantage of preventing static electricity buildup on the surface of the vehicle and preventing dust from sticking to the coating film due to the amino functional group.

[0061] Furthermore, the substance containing amodimethicone oil or its derivative has an amine group and is positively charged, which causes particle disorder by electrostatic force, which increases the spacing between particles in the coating film, thereby acting as a bridge.

[0062] In addition, a substance containing amodimethicone oil or a derivative thereof has the advantage that the dispersion structure of the particles contained in the coating film is stably maintained, the dispersibility and viscosity-increasing effect of the coating film are significantly improved, and dispersion is easily achieved by high-pressure water.

[0063] In addition, since amodimethicone oil generally has hydroxyl groups (-OH) at both ends, reactive amodimethicone oil that causes a dehydration condensation reaction can be used, and when a coating film is formed by mixing amodimethicone oil and silicone particles together, it has the advantage of being excellent in preventing heat damage to the coating film.

[0064] In addition, amodimethicone oil has excellent spreadability, makes the feel of the coating film containing amodimethicone oil soft and silky, and improves the hydrophobicity, water repellency and gloss of the coating film containing amodimethicone oil.

[0065] In addition, the amodimethicone oil improves dispersibility, thereby reducing the occurrence of cracks in the coating film, and in order to sufficiently maintain the function of the amodimethicone oil contained in the coating film, the weight % of the amodimethicone oil is preferably 40 to 50 weight %.

[0066] It is preferable to use any one of the following fluorine-containing alkoxysilanes: (3,3,3-trifluoropropyl)trimethoxysilane ((3,3,3-TRIFLUOROPROPYL)TRIMETHOXYSILANE), 1H,1H,2H,2H Perfluorooctyltriethoxysilane (1H,1H,2H,2H Perfluorooctyltriethoxysilane), trimethoxy(1H,1H,2H,2H Heptadecafluorodecyl)silane, and heptadecafluorodecyltriisopropoxysilane.

[0067] In addition, a fluorine-based silane may be added in place of the fluorine-based alkoxysilane added in the second stirring step (S120), and 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.

[0068] Specifically, the perfluoroalkylsilane compound can be trichloro(1H,1H,2H,2H-perfluorooctyl)silane or triethyl(trifluoromethyl)silane.

[0069] It is preferable to use perfluorooctyl methacrylate as the perfluoromethacrylate compound, and it is preferable to use heptadecafluoro-1-octane sulfonyl chloride as the perfluorosulfonyl chloride compound.

[0070] Fluorine-based alkoxysilane is used as a surface treatment agent for organic or inorganic materials, and when included in the vehicle wet coating agent prepared 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.

[0071] Trifluoropropyltrimethoxysilane, which has the trade name DOWSIL Q3-9030 Silane, is used for coating agent synthesis, silicone polymer manufacturing, and surface treatment, and improves the slickness, hydrophobicity, water repellency, slip resistance, and durability of the coating film that is coated on the surface of a vehicle using the wet coating agent for vehicles manufactured in the third mixing step (S130).

[0072] Trifluoropropyltrimethoxysilane improves the hydrophobicity, water repellency, and slipperiness of coating films containing trifluoropropyltrimethoxysilane due to the low surface energy of the fluorine contained in it, and improves the durability of the coating film by chemically bonding with all hydroxyl groups (-OH) present on the painted surface formed on the surface of the vehicle.

[0073] In addition, the fluorine-based alkoxysilane contained in the vehicle wet coating agent has the advantage of improving the slickness (slick feeling), hydrophobicity, water repellency, and slipperiness of the vehicle wet coating agent coated on the surface of the vehicle due to the low surface energy of fluorine itself.

[0074] In addition, fluorine has a high electron density, the second smallest atomic radius after hydrogen, and high electronegativity, which allows it to form a strong carbon-fluorine bond. Due to these characteristics of fluorine, monomers containing perfluoroalkyl groups exhibit extreme hydrophobicity with a critical surface tension of 5-10 dynes / cm.

[0075] In addition, fluorine-coated products have the advantages of being less susceptible to the chemical environment, having high heat resistance, insulating properties, surface resistivity, abrasion resistance, acid resistance, and base resistance, and being easy to clean.

[0076] Instead of the fluorine-based alkoxysilane added in the second stirring step (S120), triethoxyoctylsilane, a fluorine-based silane, can be added to the first mixed solution. When a wet coating agent for vehicles containing triethoxyoctylsilane forms a coating film on the surface of a vehicle, it has the advantage of forming a hydrophobic layer on the surface of the vehicle, thereby improving the hydrophobicity, water repellency, oxidation resistance, base resistance, and corrosion resistance of the coating film.

[0077] Referring to Table 1 below and the attached FIG. 4, the contact angles of the vehicle surface 10 on which no coating film is formed as disclosed in Table 1 are values ​​derived by cleaning the vehicle surface 10, applying a water droplet to the vehicle surface 10 on which no coating film is formed using a KRUSS DSA25 contact angle measuring instrument according to the ASTM D 5946 method, and measuring the contact angle of the water droplet, the number of measurements being repeated.

[0078] The surface 10 of a vehicle on which no coating film has been formed due to the application of a wet coating agent for a vehicle is cleaned through the steps of (1) pre-washing (high-pressure water washing), (2) applying snow foam or car shampoo to the surface of the vehicle, (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 surface 10 of the vehicle is measured using a contact angle measuring device.

[0079] When analyzing water droplets applied to the vehicle surface 10 using a contact angle meter, 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.

[0080] The coating film disclosed in Table 1 is formed on the surface 20 of a vehicle using a wet coating agent for vehicles. Here, the wet coating agent for vehicles contains 1 to 5 wt % of 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.

[0081] The surface 10 of a vehicle on which no coating film has been formed due to the application of a wet coating agent for a vehicle is cleaned through the steps of (1) pre-washing (high-pressure water washing), (2) applying snow foam or car shampoo to the surface of the vehicle, (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 surface 10 of the vehicle is measured using a contact angle measuring device.

[0082] 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 a vehicle surface 10 on which no coating film is formed using a contact angle meter.

[0083] The first one-side angle 11 means 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 a part of the vehicle surface 10 to which the water droplet is attached.

[0084] The first other side angle 12 means 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 attached.

[0085] 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 part 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 are in contact with each other when viewed from the side of the water droplet.

[0086] The second 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 part of the surface of the waterdrop adjacent to the other end point of the contact surface where the waterdrop and the vehicle surface 10 meet when viewed from the side.

[0087] 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 at an early stage are relatively higher than the first one-side angle 11 and the first other-side angle 12 measured at a later stage.

[0088] 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°.

[0089] The contact angles of the vehicle surface 20 on which the coating film is formed as disclosed in Table 1 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 instrument.

[0090] When analyzing the water droplets applied to the vehicle surface 20 with 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.

[0091] 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 a water droplet applied to the surface 20 of a vehicle on which a coating film is formed and the water droplet applied a number of times.

[0092] 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 a part of the vehicle surface 20 to which the water droplet is in close contact.

[0093] 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.

[0094] 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 part of the surface of the waterdrop adjacent to one side end of the contact surface where one side end of the waterdrop and the vehicle surface 20 are in contact with each other when viewing the waterdrop from the side.

[0095] The fourth 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 part of the surface of the waterdrop adjacent to the other end of the contact surface where the waterdrop and the vehicle surface 20 are in contact with each other when viewed from the side of the waterdrop.

[0096] 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) snow foam or car shampoo application, (3) shampoo or snow foam mitt work, (4) spraying a wet coating agent for vehicles, (5) pre-wash (high-pressure water washing), and (6) water removal, and then the contact angle is measured using a contact angle measuring device.

[0097] 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.

[0098] It can also be seen that regardless of the increase in the number of measurements, the values ​​of the second one-side angle 21 and the second other-side angle 22 measured for a single identical water droplet using a contact angle measuring device show a deviation of 0.1 to 0.8°.

[0099] [Table 1]

[0100] 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, so it can be confirmed 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.

[0101] 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 hydrophobicity or water repellency of the vehicle surface 20 is effectively maintained even if the vehicle surface 20 is repeatedly exposed to water droplets or moisture for a long period of time.

[0102] [Table 2]

[0103] Referring to Table 2 and the attached Figures 5 and 6, the friction coefficients disclosed in Table 2 are values ​​measured by a friction coefficient measuring device (product name: WL2100C, WITHLAB Co., Ltd.) according to the ASTM D 1894 method for the friction coefficients of a vehicle surface 10 on which no coating film is formed and a vehicle surface 20 on which a coating film is formed.

[0104] 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.

[0105] 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, start to be pulled in the first direction until the slide member 52 starts to move in the first direction.

[0106] That is, the static friction coefficient means the maximum value of the friction force until the slide member 52, the wire 56, and the load cell 58 start to move in the first direction, and indicates a high value when the slipperiness of the vehicle surfaces 10, 20 is low.

[0107] 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.

[0108] Referring to FIG. 6, the static friction coefficient 63 is a graph in which the X axis represents the force 60 applied to the sliding member 52 and the Y axis represents the friction force 61, and indicates the maximum stopping friction force when the stopping friction force 62 increases to its maximum in the section 64 in which the sliding member 52 is stopped.

[0109] The dynamic friction coefficient 65 is a graph in which the X-axis represents the force 60 applied to the sliding member 52 and the Y-axis represents the friction force 61, and it means the friction force generated between the vehicle surface 10, 20 and the sliding member 52 when the sliding member 52 is in a moving state 66.

[0110] Referring to Table 1, each static friction coefficient 63 of the vehicle surface 10 on which no coating film is 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, which confirms that the vehicle surface 10 has low slipperiness or slickness.

[0111] 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.

[0112] Furthermore, 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, and it can be confirmed that the adhesive strength of the vehicle surface 10 is relatively higher than the adhesive strength of the vehicle surface 20, and therefore it can be confirmed that the probability of foreign matter adhering to the vehicle surface 20 is reduced and the antifouling properties are improved.

[0113] 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.

[0114] Furthermore, each static friction coefficient 63 measured on the vehicle surface 20 on which the coating film is formed, regardless of the number of measurements, shows a relatively higher value than the dynamic friction coefficient 65 measured immediately after each measurement of the static friction coefficient 63, which confirms that the sliding member 52 slides easily along the vehicle surface 20, and that the vehicle surface 20 has excellent slip and slick properties.

[0115] Meanwhile, the vehicle wet coating agent may further include a UV blocker, which may comprise a core of spherical silicone elastomer beads and a shell of nano-sized titanium dioxide (TiO2) 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).

[0116] 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 adhered to the surface of the silicone elastomer beads.

[0117] The binder is an aminoalkylsilane-based substance, and non-limiting examples thereof include 3-aminopropyltriethoxysilane, 3-aminopropyltrimethoxysilane, and 3-2-aminoethylaminopropyltriethoxysilane.

[0118] The dispersant is at least one 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 binder is at least one selected from the group consisting of 3-aminopropyltriethoxysilane, 3-aminopropyltrimethoxysilane, and 3-(2-aminoethyl)aminopropyltrimethoxysilane.

[0119] Specifically, the titanium dioxide (TiO2) slurry used in the UV screening agent was 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 two hours. Then, 20.85 wt% (12.65 g) of organic and inorganic composite sol was added as a binder and stirring continued for one to two hours to produce the surface-treated titanium dioxide (TiO2) slurry.

[0120] 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 the amount of titanium dioxide powder is at least sufficient to produce a sufficient ultraviolet blocking effect, the amount of titanium dioxide powder contained in the titanium dioxide slurry is preferably 75.12 wt % (45.58 g) or less.

[0121] In the first process for preparing the organic and inorganic composite sol, 9 wt % (30 g) of boehmite powder was added to 90.01 wt % (300 g) of purified water and stirred to prepare a slurry for the composite sol, and then 0.99 wt % (3.3 g) of acetic acid was added and stirred at room temperature for 1 hour.

[0122] In the second process for preparing the organic and inorganic composite sol, the stirred slurry for the composite sol is heated to 70°C and reacted for 2 hours, cooled to room temperature, and then purified water is added to the slurry to a total weight of 300 g to synthesize an alumina sol.

[0123] In the third process for preparing the organic and inorganic composite sol, 8.1 wt % (39 g) of acetic acid solution was added to 20.07 wt % (130 g) of 3-glycidoxypropyltrimethoxysilane (GPS), and the mixture was stirred at room temperature for 1 hour. After that, 64.88 wt % (312.2 g) of the alumina sol was added while heating to 70°C, and the mixture was heated and reacted for 4 hours to complete the organic and inorganic composite sol.

[0124] 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.

[0125] Then, in a separate reaction vessel, 13.86 wt % (32.19 g) of silicone elastomer beads (SB902) are added to 86.14 wt % (200 g) of purified water, and stirred for a predetermined time to produce an aqueous dispersion.

[0126] 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.

[0127] The liquid contained in the precipitate is filtered using filter paper, then dried at 60°C, pulverized by dry ball milling, and passed through a 200 mesh sieve to produce a composite powder form of a UV blocking agent.

[0128] The additive is at least one selected from the group consisting of a dispersant, a binder, and an organic and inorganic composite sol, and is preferably added during the steps of preparing a titanium dioxide slurry, preparing an aqueous dispersion, and preparing a composite powder-type UV blocker.

[0129] The completed wet coating agent for vehicles containing the UV blocker has a low possibility 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.

[0130] In addition, the silicone elastomer used as the core component of the UV blocking agent has a soft feel on the skin, 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.

[0131] 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, wherein 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.

[0132] Specifically, organosilane-activated colloidal silica can be prepared by the method described in WO2004 / 035473 and generally has the chemical formula T 4-y Si-[R 1 ] y and one or more silanol groups, i.e., [SiO2]-OH groups, on the silica surface, resulting in one or more organosilane moieties attached to the silica surface.

[0133] In the organosilane reactant, each T is typically independently selected from C1-6 alkoxy, C1-6 haloalkoxy, hydroxy, and halide. Another option is a siloxane, such as one having the formula [R1] b T 3-b Si{-O-SiT 2-c [R 1 ]c}aO-SiT3 -b [R 1 ]b, where a is an integer of 0 or 1 or more, typically 0 to 5, b is 1 to 3, and c is 1 to 2.

[0134] Another example is a compound of the formula {[R 1 ] b T 3-b and disilazanes of the formula {Si}2-NH, where b is 1 to 3, and among the haloalkoxy groups, fluoro and chloro are preferred halo substituents.

[0135] Alkoxy groups and halides are often preferred as T species, with chloride being a good choice among halides and C1-4 alkoxy groups methoxy, ethoxy, propoxy or isopropoxy being good choices among alkoxy groups.

[0136] 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), pp275-284.

[0137] The organosilane includes an epoxyalkylsilane or an epoxyalkyloxyalkylsilane, which is an epoxy group that can be hydrolyzed to form the corresponding vicinal diol group.

[0138] There can be more than one different organosilane 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.

[0139] The organosilane-functionalized colloidal silica particles exhibit safety without substantial gelling or precipitation for at least 2 to 4 months when normally stored at room temperature.

[0140] Coating films containing organosilane-modified colloidal silica have relatively improved tear resistance, tensile strength, electromagnetic radiation reflectance in the wavelength range of 280~2500nm, resistance to adsorption of contaminants (anti-fouling properties) against hydrophobic and hydrophilic substances, and storage safety compared to coating films that do not contain organosilane-modified colloidal silica.

[0141] The microspheres contained in the light-reflecting composition are hollow, which improves the visible and near-infrared reflectance of the light-reflecting composition, and it is preferred to use expandable microspheres in which the hollow is expanded.

[0142] 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.

[0143] The expandable microspheres contained in the light-reflecting composition have an average diameter of 300 to 500 μm. Non-expandable microspheres can also be contained in the light-reflecting composition. Examples of suitable microspheres are described in WO2007 / 073318 and are available under the trade name Expancel TM It is sold as.

[0144] The microspheres are contained in the light-reflecting composition, which has 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.

[0145] Therefore, the wet adhesion rate of the light-reflecting composition is improved by the contained microspheres, and therefore, when the light-reflecting composition is sprayed onto the surface of a vehicle together with a vehicle wet coating agent, it has the advantage of being stably coated on the surface of the vehicle.

[0146] 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 antifouling properties.

[0147] The light-reflecting composition may further include an organic binder, and the organic binder is one or more organic binders selected from the group consisting of water-soluble resins and water-soluble polymers.

[0148] 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.

[0149] 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 the coating film is applied to the surface of the vehicle glass, it has the advantage of reflecting light in the wavelength range of 280 to 2500 nm.

[0150] Example 1

[0151] A first mixture is produced by stirring 1 to 5 wt % of decamethylcyclopentasiloxane, 42 to 55 wt % of purified water, 5 to 10 wt % of an alcohol-based nonionic surfactant, and 40 to 50 wt % of amodimethicone oil at 50 to 100 rpm for 9.5 to 18.5 hours.

[0152] Next, 0.5 to 2% by weight of trifluoropropyltrimethoxysilane, which is a fluorine-based alkoxysilane, is added to the first mixture, and the mixture is stirred at 50 to 100 rpm for 5 to 10 hours to produce a second mixture.

[0153] Next, 1 to 23 wt % of purified water is further added to the second mixture, and the mixture is stirred at 50 to 100 rpm for 3 to 8 hours to prepare a third mixture. The third mixture is then packaged or poured into a container to complete the wet coating agent for vehicles.

[0154] <Example 2>

[0155] A first mixture is produced by stirring 1 to 5 wt % of decamethylcyclopentasiloxane, 42 to 55 wt % of purified water, 5 to 10 wt % of an alcohol-based nonionic surfactant, and 40 to 50 wt % of amodimethicone oil at 50 to 100 rpm for 7.5 to 16.5 hours.

[0156] Next, 0.5 to 2% by weight of triethoxyoctylsilane, which is a fluorine-based silane, is added to the first mixture, and the mixture is stirred at 50 to 100 rpm for 3 to 7 hours to produce a second mixture.

[0157] Next, 1 to 23 wt % of purified water is further added to the second mixed solution, and the mixture is stirred at 50 to 100 rpm for 3 to 6 hours to prepare a third mixed solution. The third mixed solution is then packaged or poured into a container to complete the wet coating agent for vehicles.

[0158] 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, thereby improving the hydrophobicity, water repellency, oxidation resistance, base resistance, and corrosion resistance of the coating film.

[0159] In addition, triethoxyoctylsilane contained in the vehicle wet coating agent improves the mixing and dispersion of the first mixture liquid inside the vehicle wet coating agent formed as a polymer, which has the advantage of shortening the manufacturing time compared to the manufacturing time of the vehicle wet coating agent of Example 1.

[0160] Example 3

[0161] A first mixture is produced by stirring 1 to 5 wt % of decamethylcyclopentasiloxane, 42 to 55 wt % of purified water, 5 to 10 wt % of an alcohol-based nonionic surfactant, and 40 to 50 wt % of amodimethicone oil at 50 to 100 rpm for 9.5 to 18.5 hours.

[0162] Next, 0.5 to 1% by weight of trichlorosilane, which is a type of fluorine-based alkoxysilane, is added to the first mixture, and the mixture is stirred at 50 to 100 rpm for 5 to 10 hours to produce a second mixture.

[0163] Next, 1 to 23 wt % of purified water is further added to the second mixture, and the mixture is stirred at 50 to 100 rpm for 3 to 8 hours to prepare a third mixture. The third mixture is then packaged or poured into a container to complete the wet coating agent for vehicles.

[0164] The trichlorosilane contained in the vehicle wet coating agent is a crosslinkable silane compound, and when mixed with decamethylcyclopentasiloxane containing silica particles, it has the advantage of preventing the aggregation of decamethylcyclopentasiloxane and improving the mixing and dispersion effects of the second mixture.

[0165] Therefore, 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.

[0166] Example 4

[0167] Prior to carrying out the first stirring step (S110), nitrogen gas is injected into the reaction vessel to fill the inside of the reaction vessel with nitrogen, and once the inside of the reaction vessel is filled with nitrogen, a nitrogen injection step (S105) is carried out to stop the injection of nitrogen.

[0168] A first mixture is prepared by stirring 1 to 5 wt% of decamethylcyclopentasiloxane, 2 to 5 wt% of the UV blocking agent, 40 to 50 wt% of purified water, 5 to 10 wt% of an alcohol-based nonionic surfactant, and 40 to 50 wt% of amodimethicone oil at 50 to 100 rpm for 4.5 to 13.5 hours.

[0169] Next, 0.5 to 2% by weight of trifluoropropyltrimethoxysilane, which is a fluorine-based alkoxysilane, is added to the first mixture, and the mixture is stirred at 50 to 100 rpm for 2 to 6 hours to produce a second mixture.

[0170] Next, 1 to 23 wt % of purified water is further added to the second mixed solution, and the mixture is stirred at 50 to 100 rpm for 1 to 4 hours to prepare a third mixed solution. The third mixed solution is then packaged or poured into a container to complete the wet coating agent for vehicles.

[0171] 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 glass surface of the vehicle.

[0172] In addition, since the vehicle wet coating agent produced in Example 4 is produced inside a reaction vessel filled with nitrogen, there is an advantage in that decamethylcyclopentasiloxane, UV blocking agent, 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).

[0173] In addition, since the vehicle wet coating agent produced in Example 4 is stably produced inside a reaction vessel filled with nitrogen, the production time of the vehicle wet coating agent is advantageously shorter than the production time of each of the vehicle wet coating agents produced in Examples 1 to 3.

[0174] Meanwhile, the UV blocking agent comprises a core of spherical silicone elastomer beads and a shell 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. Since the specific method for preparing the UV blocking agent has been described above, a redundant description will be omitted.

[0175] 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.

[0176] <Example 5>

[0177] Prior to carrying out the first stirring step (S110), nitrogen gas is injected into the reaction vessel to fill the inside of the reaction vessel with nitrogen, and once the inside of the reaction vessel is filled with nitrogen, a nitrogen injection step (S105) is carried out to stop the nitrogen injection.

[0178] A first mixture is prepared by stirring 1 to 5 wt% of decamethylcyclopentasiloxane, 2 to 5 wt% of the UV blocking agent, 35 to 48 wt% of purified water, 5 to 10 wt% of an alcohol-based nonionic surfactant, and 40 to 50 wt% of amodimethicone oil at 50 to 100 rpm for 4.5 to 13.5 hours.

[0179] Next, 0.5 to 2% by weight of trifluoropropyltrimethoxysilane, which is a fluorine-based alkoxysilane, is added to the first mixture, and the mixture is stirred at 50 to 100 rpm for 2 to 6 hours to produce a second mixture.

[0180] Next, 1 to 23% by weight of purified water is further added to the second mixed liquid, and the mixture is stirred at 50 to 100 rpm for 1 to 4 hours to produce a third mixed liquid.

[0181] Next, 3.5 to 5.5 wt % of a light-reflecting composition is added to the third mixture and stirred to prepare a fourth mixture, which is then packaged or poured into a container to complete a wet coating agent for vehicles.

[0182] 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 glass surface of the vehicle.

[0183] In addition, since the vehicle wet coating agent prepared in Example 5 is prepared inside a reaction vessel filled with nitrogen, there is an advantage in that decamethylcyclopentasiloxane, UV blocking agent, 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).

[0184] In addition, the vehicle wet coating agent produced in Example 5 is stably produced in a reaction vessel filled with nitrogen, which has the advantage that the production time of the vehicle wet coating agent is relatively shorter than the production time of each of the vehicle wet coating agents produced in Examples 1 to 3.

[0185] Meanwhile, the UV blocking agent 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. Since the specific method for preparing the UV blocking agent has been described above, a redundant description will be omitted.

[0186] The light-reflecting composition is a coating composition comprising organosilane-functionalized colloidal silica and hollow microspheres, wherein 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 preparing the light-reflecting composition have been described above, and therefore, redundant description will be omitted.

[0187] The wet coating agent for vehicles produced in Example 5 is produced in a reaction vessel filled with nitrogen, which has the advantages of reducing the overall production time and cost and reducing the defective rate.

[0188] In addition, when the wet coating agent for vehicles is sprayed onto the surface of the vehicle glass, the coating film formed contains a UV blocking agent, which effectively blocks ultraviolet rays that are harmful to the human body, thereby providing the advantage of protecting the body of users seated inside the vehicle.

[0189] In addition, when the vehicle wet coating agent is sprayed onto the surface of the vehicle glass, the formed coating film contains a light-reflective composition, which effectively blocks light entering the vehicle surface, the vehicle glass surface, or the interior of the vehicle. Therefore, compared to the coating films formed by the vehicle wet coating agents prepared in Examples 1 to 4 under the same environment, it has the advantage of significantly reducing heat generation caused by temperature increases on the vehicle surface and inside the vehicle.

[0190] Although preferred embodiments of the present invention have been described above with reference to the accompanying drawings, it should be understood that the embodiments described herein and the configurations shown in the drawings are merely the most preferred embodiments of the present invention and do not fully represent the technical ideas of the present invention, and that there may be various equivalents and modifications that can replace them at the time of filing this application. Therefore, it should be understood that the embodiments described above are illustrative in all respects and are not limiting, and the scope of the present invention is determined by the claims that follow 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 included in the scope of the present invention. [Explanation of symbols]

[0191] 100 Manufacturing method of wet coating agent for vehicle

Claims

1. A wet coating agent for vehicles, comprising decamethylcyclopentasiloxane, purified water, an alcohol-based nonionic surfactant, amodimethicone oil, and a fluorine-based silane.

2. 2. The wet coating agent for vehicles according to claim 1, comprising 1 to 5 wt % of the 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 the fluorine-based silane.

3. 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.

4. 4. The method of claim 3, wherein the first stirring step comprises 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.

5. 5. The method of claim 4, wherein the second stirring step comprises adding 0.5 to 2 wt % of the fluorine-based silane and stirring the mixture.

6. 6. The method of claim 5, wherein the third stirring step further comprises adding 1 to 23 wt % of purified water and stirring.

7. The method for manufacturing a wet coating agent for vehicles according to claim 6, wherein the fluorine-based silane is trifluoropropyltrimethoxysilane.

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