Surface coating composition, and coated substrate

Abstract

A surface coating composition according to embodiments of the present invention comprises a siloxane-based resin and a mixed solvent. The mixed solvent includes two or more types of organic solvents having different boiling points or different polarities.

Description

Composition and coating substrate for surface coating

[0001] The present disclosure provides a composition for surface coating and a coating substrate.

[0002] Equipment operating in low or extremely low temperatures, such as transmission lines, aircraft, solar panels, and wind turbines, are prone to ice formation on their surfaces. Ice formation on external surfaces can interfere with normal operation and even lead to equipment failure.

[0003] To solve these problems, methods of spraying heated water on the surface of the equipment or increasing the temperature of the equipment with an electric heating system have been proposed, but there are problems such as metal corrosion or excessive energy consumption.

[0004] Therefore, superhydrophobic treatment has been proposed as a surface treatment method for equipment. Superhydrophobic surfaces have a low affinity for water, which reduces the adhesion of water and / or ice, thereby inhibiting freezing and icing. However, the surface treatment can be removed by physical external force, and the anti-icing properties rapidly deteriorate with repeated freezing and thawing. Therefore, a surface treatment technology for more effective anti-icing is urgently needed.

[0005] One object of the present disclosure is to provide a composition for surface coating capable of providing a coating layer with improved surface properties.

[0006] One object of the present disclosure is to provide a coating substrate having a coating layer with improved surface properties.

[0007]

[0008] 1. A surface coating composition comprising a siloxane resin and a mixed solvent, wherein the mixed solvent comprises two or more organic solvents having different boiling points or different polarities.

[0009] 2. In the above 1, the boiling point of the mixed solvent calculated by the following formula 1 is 75 ℃ to 105 ℃, a composition for surface coating:

[0010] [Formula 1]

[0011]

[0012] (In the above equation 1, BP mix is the boiling point of the above mixed solvent, and BP k is the boiling point (℃) of any of the above organic solvents, and W k is the proportion of the weight of any of the organic solvents in the total weight of the composition, and n is the number of types of the organic solvents included in the mixed solvent.

[0013] 3. In the above 1, the polarity index of the mixed solvent calculated by the following formula 2 is 3.5 to 4.5, a composition for surface coating:

[0014] [Formula 2]

[0015]

[0016] (In the above equation 1, PI mix is the polarity of the above mixed solvent, and PI k is the polarity of any of the above organic solvents, and W k is the proportion of the weight of any of the organic solvents in the total weight of the composition, and n is the number of types of the organic solvents included in the mixed solvent.

[0017] 4. A composition for surface coating, wherein in the above 1, the organic solvent comprises at least one selected from the group consisting of a ketone solvent, an acetate solvent, an aromatic hydrocarbon solvent, an ether solvent, and an alcohol solvent.

[0018] 5. A surface coating composition according to claim 1, wherein the organic solvent comprises a first organic solvent having a boiling point of 90° C. or higher and a second organic solvent having a boiling point of less than 90° C.

[0019] 6. A surface coating composition according to the above 1, wherein the organic solvent comprises a first organic solvent having a polarity of 4 or more and a second organic solvent having a polarity of less than 4.

[0020] 7. A composition for surface coating, wherein in the above 1, the organic solvent comprises at least two selected from the group consisting of dimethyl ketone, methyl ethyl ketone, diethyl ketone, benzene, toluene, methyl toluene, xylene, ethyl acetate, n-propyl acetate, i-propyl acetate, n-butyl acetate, i-butyl acetate, and t-butyl acetate.

[0021] 8. A surface coating composition comprising, in the above 1, a first siloxane resin having an unsaturated group bonded to silicon atoms at both terminals; and a second siloxane resin having hydrogen atoms bonded to silicon atoms at both terminals.

[0022] 9. A composition for surface coating, wherein in the above 8, the ratio of the weight of the second siloxane-based resin to the weight of the first siloxane-based resin among the total weight of the composition is 0.5 to 1.

[0023] 10. A surface coating composition according to the above 8, wherein the first siloxane-based resin comprises a dimethyl siloxane-based resin and a vinyl methoxy siloxane-based resin.

[0024] 11. A composition for surface coating, wherein the content of the siloxane-based resin in the above 1 is 10 to 30 parts by weight based on 100 parts by weight of the mixed solvent.

[0025] 12. A composition for surface coating, further comprising at least one selected from the group consisting of a catalyst, a silane compound, and a diol compound in the above 1.

[0026] 13. A composition for surface coating, wherein in the above 12, the silane compound is a reactive group-containing trialkoxysilane compound.

[0027] 14. A composition for surface coating, wherein the content of the silane compound in the above 12 is 0.01 to 3 parts by weight based on 100 parts by weight of the mixed solvent.

[0028] 15. A coating substrate comprising a coating film formed from the surface coating composition of the above 1.

[0029] A coating substrate having a surface that is resistant to icing or freezing can be realized using a surface coating composition according to exemplary embodiments of the present invention.

[0030] The surface of a coating film formed from the above surface coating composition can have improved appearance characteristics and enhanced hydrophobicity. Accordingly, freezing on the surface of the coating film can be prevented.

[0031] According to embodiments of the present invention, a surface coating composition is provided, which comprises a siloxane-based resin and a mixed solvent comprising two or more organic solvents having different boiling points or different polarities. In addition, a coating substrate is provided, which comprises a coating film formed from the surface coating composition.

[0032] Below, the present disclosure will be described in detail. However, this is merely exemplary and the present disclosure is not limited to the specific embodiments described as examples.

[0033] The above-described mixed solvent may be provided as a component for dissolving the siloxane-based resin. The above-described mixed solvent comprises two or more organic solvents having different boiling points or polarities. Accordingly, compared to the case where a single solvent is used, the coating properties of the composition can be improved, the surface roughness of the coating film formed from the composition can be reduced, and the appearance can be improved. Accordingly, the anti-icing properties of the coating film can be improved.

[0034] The above boiling point may refer to the boiling point temperature at which a liquid changes into a gaseous state. In this specification, the boiling point is explained on the assumption that the unit is Celsius (℃). The above polarity is a measure of the polarity of a solvent, and a higher value may indicate a higher polarity. Generally, a solvent with a low polarity may have a molecular structure that includes a long hydrophobic group. Accordingly, the boiling point may be high. Conversely, a solvent with a high polarity may have a low molecular weight. Accordingly, the intermolecular attraction may be reduced, which may lower the boiling point.

[0035] In exemplary embodiments, at least some of the boiling points and polarities of the organic solvents included in the mixed solvent may be different from each other.

[0036] For example, when the mixed solvent includes three or more organic solvents, the boiling point of the first organic solvent may be different from the boiling point of the second organic solvent, and the polarity of the second organic solvent may be different from the polarity of the third organic solvent.

[0037] The boiling point of the above mixed solvent may be 75°C to 105°C. The boiling point of the above mixed solvent may be calculated by the following equation 1.

[0038] [Formula 1]

[0039]

[0040] In the above equation 1, BP mix is the boiling point of the above mixed solvent, and BP k is the boiling point (℃) of any of the above organic solvents, and W k is the proportion of the weight of any of the organic solvents in the total weight of the composition, and n is the number of types of the organic solvents included in the mixed solvent.

[0041] The boiling point of the above mixed solvent may be from 75°C to 95°C or from 75°C to 90°C. Within the above range, the problem of clogging of the composition spray nozzle when the boiling point is too low can be prevented, and the time from application of the composition to drying can be shortened.

[0042] The polarity index of the above mixed solvent may be 3.5 to 4.5. The polarity index of the above mixed solvent can be calculated using the following equation 2.

[0043] [Formula 2]

[0044]

[0045] In the above equation 1, PI mix is the polarity of the above mixed solvent, and PI k is the polarity of any of the above organic solvents, and W k is the proportion of the weight of any of the organic solvents in the total weight of the composition, and n is the number of types of the organic solvents included in the mixed solvent.

[0046] The polarity of the above mixed solvent may be 4.0 to 4.5 or 4.3 to 4.5. Within the above range, the non-polar siloxane resin can be appropriately dissolved while improving the coatability of the composition.

[0047] The above mixed solvent can satisfy the following equation 3.

[0048] [Formula 3]

[0049]

[0050] In the above equation 3, W k is the proportion of the weight of any of the organic solvents in the total weight of the composition, and n is the number of types of the organic solvents included in the mixed solvent.

[0051] The above n can be 2 to 5, for example, n can be 2.

[0052] The organic solvent may include a ketone solvent, an acetate solvent, an aromatic hydrocarbon solvent, an ether solvent, an alcohol solvent, etc. For example, the organic solvent may include two types of ketone solvents having different boiling points or polarities. Alternatively, the organic solvent may include a ketone solvent and an acetate solvent having different boiling points or polarities.

[0053] The above ketone solvents include dimethyl ketone (acetone), methyl ethyl ketone, diethyl ketone, methyl amyl ketone, methyl isobutyl ketone, and cyclohexanone.

[0054] Examples of the above acetate-based solvents include methyl cellosolve acetate, ethyl cellosolve acetate, alkyl acetate having 1 to 10 carbon atoms, alkoxy alkyl acetate having 2 to 10 carbon atoms, ethylene glycol monoacetate, ethylene glycol diacetate, propylene glycol methyl ether acetate, ethylene glycol monoalkyl ether acetate, diethylene glycol monoalkyl ether acetate, dipropylene glycol methyl ether acetate, diethylene glycol monoacetate, diethylene glycol diacetate, diethylene glycol monoalkyl ether acetate, propylene glycol monoacetate, propylene glycol diacetate, propylene glycol monoalkyl ether acetate, etc.

[0055] Examples of the above aromatic hydrocarbon solvents include benzene, toluene, xylene, and mesitylene.

[0056] Examples of the above ether solvents include ethylene glycol monoalkyl ether compounds, diethylene glycol dialkyl ether compounds, and propylene glycol monomethyl ether.

[0057] Examples of the alcohol-based solvents include ethanol, propanol, butanol, hexanol, cyclohexanol, ethylene glycol, glycerin, and 4-hydroxy-4-methyl-2-pentanone.

[0058] According to exemplary embodiments, the organic solvent may include a first organic solvent and a second organic solvent having different boiling points. For example, the boiling point of the first organic solvent may be higher than the boiling point of the second organic solvent.

[0059] According to exemplary embodiments, the organic solvent may include a first organic solvent having a boiling point of 90° C. or higher and a second organic solvent having a boiling point of less than 90° C. The boiling point of the first organic solvent may be from 90° C. to 120° C., and the boiling point of the second organic solvent may be from 60° C. to 90° C. In some embodiments, the boiling point of the first organic solvent may be from 100° C. to 120° C., and the boiling point of the second organic solvent may be from 60° C. to 80° C. The mixed solvent may include the first organic solvent and the second organic solvent having different boiling points as described above, and may have a boiling point calculated by Equation 1 within an appropriate range.

[0060] According to exemplary embodiments, the organic solvent may include a first organic solvent and a second organic solvent having different polarities. For example, the polarity of the first organic solvent may be higher than the polarity of the second organic solvent.

[0061] According to exemplary embodiments, the organic solvent may include a first organic solvent having a polarity of 4 or greater and a second organic solvent having a polarity of less than 4. The polarity of the first organic solvent may be 4 to 6, and the polarity of the second organic solvent may be 2 or greater and less than 4. In some embodiments, the polarity of the first organic solvent may be 4 to 5, and the polarity of the second organic solvent may be 2 to 3. The mixed solvent may include the first organic solvent and the second organic solvent having different polarities as described above and have a boiling point calculated by Equation 1 within an appropriate range.

[0062] According to exemplary embodiments, the organic solvent may include at least two selected from the group consisting of dimethyl ketone, methyl ethyl ketone, diethyl ketone, benzene, toluene, methyltoluene, xylene, ethyl acetate, n-propyl acetate, i-propyl acetate, n-butyl acetate, i-butyl acetate, and t-butyl acetate.

[0063] The above siloxane-based resin may be a resin having a polydimethylsiloxane skeleton. The above siloxane-based resin has a very low interaction with water or ice, and thus can prevent icing or freezing on the surface of the coating film.

[0064] The above siloxane-based resin may include a first siloxane-based resin and a second siloxane-based resin. The first siloxane-based resin may have an unsaturated group bonded to silicon atoms at both terminals, respectively. The second siloxane-based resin may have a hydrogen atom bonded to silicon atoms at both terminals, respectively.

[0065] The first siloxane-based resin may be a siloxane-based resin containing crosslinkable terminal groups. According to exemplary embodiments, the first siloxane-based resin may be a siloxane-based resin containing unsaturated groups (e.g., vinyl groups) each bonded to silicon atoms at both terminals of the molecule.

[0066] For example, the first siloxane resin may include a compound represented by the following chemical formula 1.

[0067] [Chemical Formula 1]

[0068]

[0069] In chemical formula 1, m and n can be adjusted in consideration of the viscosity range. For example, m can be a natural number in the range of 40 to 800, 80 to 800, 100 to 800, 130 to 700, or 150 to 700, and n can be an integer in the range of 0 to 500.

[0070] In some embodiments, 25 of the first siloxane resin o At C, the viscosity may be 50 cps to 150,000 cps, preferably 70 cps to 1,500 cps, 100 cps to 1,500 cps, 200 cps to 1,500 cps, more preferably 300 cps to 1,200 cps.

[0071] In some embodiments, the weight average molecular weight of the first siloxane-based resin may be adjusted in consideration of the viscosity within the above-described range. For example, the weight average molecular weight of the first siloxane-based resin may be 1,500 to 50,000, 10,000 to 50,000, preferably 10,000 to 30,000, and more preferably 20,000 to 30,000.

[0072] According to exemplary embodiments, the first siloxane-based resin may include a dimethyl siloxane-based resin and a vinyl methoxy siloxane-based resin. The dimethyl siloxane-based resin and the vinyl methoxy siloxane-based resin may include unsaturated groups at both terminals, and may each include a dimethyl siloxane repeating unit or a vinyl methoxy siloxane repeating unit.

[0073] For example, it may include a dimethyl siloxane-based resin represented by the above chemical formula 1 and a vinyl methoxy siloxane-based resin represented by the following chemical formula 2.

[0074] [Chemical Formula 2]

[0075]

[0076] In chemical formula 2, w and z can be adjusted in consideration of the viscosity range. For example, w can be a natural number in the range of 40 to 800, 80 to 800, 100 to 800, 130 to 700, or 150 to 700, and z can be an integer in the range of 0 to 500.

[0077] The content of the vinylmethoxy siloxane resin among the total weight of the first siloxane resin may be 5 wt% to 30 wt%. In some embodiments, the content of the vinylmethoxy siloxane resin among the total weight of the first siloxane resin may be 7 wt% to 15 wt%. Within the above range, the icing and / or freezing characteristics of the surface of the coating layer formed from the composition may be improved.

[0078] The content of the first siloxane-based resin may be about 5 to 20 parts by weight based on 100 parts by weight of the mixed solvent. In some embodiments, the content of the first siloxane-based resin may be about 7 to 15 parts by weight based on 100 parts by weight of the mixed solvent. Within the above range, the anti-icing properties of the coating film may be secured.

[0079] The above second siloxane-based resin may be a siloxane-based resin having a different structure from the above first siloxane-based resin.

[0080] The above second siloxane resin is included as a chain extender or chain regulator of the composition, and can control the overall viscosity, flowability, crosslinking property, etc. of the composition.

[0081] According to exemplary embodiments, the second siloxane-based resin may be a siloxane-based resin in which hydrogen atoms are bonded to silicon atoms at both terminals.

[0082] For example, the second siloxane resin may include a compound represented by the following chemical formula 3.

[0083] [Chemical Formula 3]

[0084]

[0085] In chemical formula 3, j and k can be adjusted in consideration of the molecular weight and viscosity ranges. For example, j can be a natural number in the range of 10 to 700, 20 to 700, 30 to 700, 50 to 700, 100 to 700, or 130 to 700, and k can be an integer in the range of 0 to 500.

[0086] In some embodiments, 25 of the second siloxane resin o At C, the viscosity may be from 10 cps to 1,500 cps, preferably from 100 cps to 1,500 cps, from 200 cps to 1,500 cps, and more preferably from 300 cps to 1,200 cps.

[0087] The weight average molecular weight of the second siloxane-based resin can be adjusted according to the viscosity range. For example, the weight average molecular weight of the second siloxane-based resin can be 500 to 5,000, 1,000 to 4,000, and preferably 1,500 to 3,000. Within the molecular weight and viscosity ranges, appropriate application properties and flowability of the composition can be secured.

[0088] The content of the second siloxane-based resin may be about 3 to 15 parts by weight based on 100 parts by weight of the mixed solvent. In some embodiments, the content of the second siloxane-based resin may be about 5 to 12 parts by weight based on 100 parts by weight of the mixed solvent. Within the above range, the anti-icing properties of the coating film may be secured.

[0089] According to exemplary embodiments, the weight ratio of the second siloxane-based resin to the weight of the first siloxane-based resin in the total weight of the composition may be 0.5 to 1. According to some embodiments, the weight ratio of the second siloxane-based resin to the weight of the first siloxane-based resin in the total weight of the composition may be 0.6 to 0.9 or 0.7 to 0.8. Within the above range, the second siloxane-based resin can appropriately control the chain length of the first siloxane-based resin, thereby preventing the viscosity of the composition from becoming too high and thereby reducing the coatability.

[0090] According to exemplary embodiments, the content of the siloxane-based resin may be 10 to 30 parts by weight based on 100 parts by weight of the mixed solvent. According to some embodiments, the content of the siloxane-based resin may be 15 to 25 parts by weight based on 100 parts by weight of the mixed solvent. Within this range, both the coatability of the composition and the anti-icing performance of the coating film may be improved.

[0091] According to exemplary embodiments, the composition may further include a catalyst, a silane compound, a diol compound, and the like.

[0092] The above catalyst can act as an additive to control the speed of coating film formation by promoting crosslinking and / or interaction of siloxane-based resins.

[0093] In some embodiments, the catalyst may comprise a compound or complex of Pt(II), Pt(IV), and / or Pt(0). For example, the catalyst may comprise chloroplatinic acid, Ashby's catalyst, or Karstedt catalyst.

[0094] According to exemplary embodiments, the catalyst may comprise an organic-inorganic hybrid catalyst containing platinum and silicon.

[0095] The catalyst may contain Pt atoms and Si2O groups (-Si-O-Si-) within the molecule. For example, silicon (Si) atoms of the Si2O group may be bonded to vinyl groups, and Pt atoms may be coordinated or captured by the vinyl groups.

[0096] The content of the catalyst may be 10 ppm to 100 ppm of the total weight of the composition, and the formation speed of the coating film may be increased within the above range.

[0097] The above silane compound can increase the bonding strength between the substrate surface and the coating film, thereby preventing the coating film from being detached due to external force and improving the durability of the coating substrate.

[0098] The above silane compound may include a trialkoxysilane compound. For example, the silane compound may be a reactive group-containing trialkoxysilane compound, and may include a compound represented by the following chemical formula 4.

[0099] [Chemical Formula 4]

[0100]

[0101] In chemical formula 4, R1 to R3 are each independently a methyl group or an ethyl group, L is a divalent alkylene group having 1 to 5 carbon atoms, and R4 may be a glycidyloxy group, a vinyl group, a mercapto group, a (meth)acryloxy group, an amine group, an isocyanate group, or an acetoacetate group.

[0102] The content of the above silane compound may be 0.01 to 3 parts by weight per 100 parts by weight of the mixed solvent. Within the above range, the anti-icing properties of the coating film surface can be further improved.

[0103] The above diol compound may be a diol compound containing a hydrocarbon chain having 3 to 10 carbon atoms. The diol compound can further suppress icing on the surface of the coating film.

[0104] For example, the diol compound may include ethylene glycol, 1,2-hexanediol, 1,6-hexanediol, etc.

[0105] The content of the above diol compound may be 0.01 to 3 parts by weight per 100 parts by weight of the mixed solvent. Within the above range, the anti-icing properties of the coating film surface can be further improved.

[0106] According to exemplary embodiments, a coating substrate is provided comprising a substrate and an anti-icing coating film formed from the surface coating composition. The coating substrate can be employed in various objects used in environments where freezing or icing must be prevented.

[0107] The above material is not particularly limited and may be, for example, glass, metal, plastic, etc.

[0108] The water contact angle of the surface on which the coating film of the above description is formed is not particularly limited, but may be, for example, about 90° or more.

[0109] The above coating film can be formed on one or both sides of the substrate, and can be formed from the surface coating composition described above.

[0110] For example, the coating film can be formed by applying the surface coating composition to the surface of the substrate and then drying it.

[0111] The above coating method is not particularly limited, and can be performed by methods such as spin coating, knife coating, and dip coating.

[0112] The above drying can be performed at a temperature capable of removing the mixed solvent. For example, the drying can be performed at a temperature of 80°C to 100°C, and the drying time can be appropriately controlled.

[0113] The thickness of the above coating film may be about 1 μm to 10 μm, for example, about 3 μm to 7 μm. Within the above range, the coating film shape may be uniform while filling in the unevenness of the substrate surface.

[0114] Hereinafter, embodiments of the present invention will be further described with reference to specific experimental examples. The examples and comparative examples included in the experimental examples are merely illustrative of the present invention and do not limit the scope of the appended claims. It will be apparent to those skilled in the art that various modifications and variations of the examples are possible within the scope and technical spirit of the present invention, and it is also natural that such modifications and variations fall within the scope of the appended claims.

[0115]

[0116] Example 1

[0117] To 100 parts by weight of a mixed solvent containing toluene and ethyl acetate in a weight ratio of 10:90, 10 parts by weight of vinyl-terminated polydimethylsiloxane (Sigma-Aldrich) having a molecular weight of approximately 25,000 g / mol, 7.8 parts by weight of hydrogen-terminated polydimethylsiloxane (Gelest) having a molecular weight of 2,300 g / mol, and 50 ppm of Pt catalyst were added, and then stirred for 30 minutes to prepare a composition for surface coating.

[0118] The surface coating composition was spin-coated at 500 rpm on one side of soda glass (substrate) having a water contact angle of 50° and dried in an oven at 100°C for 30 minutes to produce a coating substrate having a coating film of about 5 μm in thickness.

[0119]

[0120] Examples 2 to 12 and Comparative Examples 1 to 4

[0121] A surface coating composition and a coating substrate were prepared in the same manner as in Example 1, except that the type of substrate, type of solvent and mixing ratio (weight ratio), type and content of siloxane resin, and type and content of additives were adjusted as shown in Table 1 below.

[0122] Solvent (weight part) Siloxane resin (based on 100 weight parts of mixed solvent) Additive type A-1A-2A-3A-4A-5B-1B-2B-3C-1Example 1S-1-1090--107.8--Example 2S-1-2080--107.8--Example 3S-1-4060--107.8--Example 4S-150-50--107.8--Example 5S-150--50-107.8--Example 6S-150-50--97.81-Example 7S-150-50--97.8-1Example 8S-250--50-107.8--Example 9S-350--50-107.8--Example 10S-450--50-107.8--Example 11S-1-6040--107.8--Example 12S-120-80--107.8--Comparative Example 1S-1-100---107.8--Comparative Example 2S-1100----107.8--Comparative Example 3S-1----100107.8--Comparative Example 4S-1---------

[0123] S-1: Soda glass (contact angle 50°)

[0124] S-2: Alkali-free glass (contact angle 32.1°)

[0125] S-3: Surface corona-treated alkali-free glass (contact angle 0°)

[0126] S-4: PET substrate (contact angle 85.87°)

[0127] A-1: Methyl ethyl ketone (boiling point: 79.64 ℃, polarity: 4.7)

[0128] A-2: Toluene (boiling point: 110.6 ℃, polarity: 2.4)

[0129] A-3: Ethyl acetate (boiling point: 77.1 ℃, polarity: 4.4)

[0130] A-4: t-butyl acetate (boiling point: 97 ℃, polarity: 4.0)

[0131] A-5: i-butanol (boiling point: 108 ℃, polarity: 4.0)

[0132] B-1: Vinyl-terminated polydimethylsiloxane (molecular weight approximately 25,000 g / mol, Sigma-Aldrich)

[0133] B-2: Hydrogen-terminated polydimethylsiloxane (molecular weight approximately 2,300 g / mol, Gelest)

[0134] B-3: Vinylmethoxysiloxane (VMM-010, Gelest)

[0135] C-1: 3-Glycidyloxypropyl trimethoxysilane

[0136]

[0137] Experimental example

[0138] The properties of the coating substrates of the examples and comparative examples were evaluated according to the following experimental examples and are shown in Table 2. In addition, the boiling points and polarities of the mixed solvents of the examples and comparative examples were calculated according to the above equations 1 and 2 and are shown in Table 2.

[0139] (1) Appearance evaluation

[0140] The appearance of the coating film surface of the coating substrates of the examples and comparative examples was observed with the naked eye, and the area ratio of the uncoated area due to poor wettability was calculated and evaluated according to the following criteria.

[0141] - Evaluation criteria

[0142] Lv 1: Area of ​​non-coating or protrusion defects less than 1%

[0143] Lv 2: Area of ​​non-coating or protrusion defects 1% or more but less than 3%

[0144] Lv 3: Area of ​​non-coating or protrusion defects 3% or more but less than 5%

[0145] Lv 4: Area of ​​non-coating or protrusion defects 5% or more but less than 7%

[0146] Lv 5: Area of ​​non-coating or protrusion defects 7% or more but less than 9%

[0147]

[0148] (2) Measurement of the contact angle of the coating film surface

[0149] Using a contact angle measuring device (manufactured by Kyowa Kaimen Kagaku Co., Ltd.), 3 μL of water was dropped onto the surface of the coating film of the coating substrates of the examples and comparative examples, and the static contact angle was measured.

[0150]

[0151] (3) Contact angle measurement after wear treatment

[0152] Using a steel wool measuring device, the coating film surface of the coating substrates of the examples and comparative examples was subjected to abrasion treatment by reciprocating friction 100 times with steel wool count #0000, 500 g / cm2, and a speed of 140 mm / sec. Then, using a contact angle measuring device (manufactured by Kyowa Kaimen Kagaku Co., Ltd.), the static contact angle was measured with 3 μL of water.

[0153]

[0154] (4) Measurement of ice adhesion

[0155] Cylinder-shaped ice with a diameter of 10 mm and a height of 10 mm was placed on the surface of the coating film of the coating substrates of the examples and comparative examples, and a transverse stress was applied at a speed of 1 mm / s using a surface texture analyzer (SurTa) measuring device to measure the force when the ice was peeled off from the surface of the coating film.

[0156] Appearance (Lv) Contact angle Contact angle after wear treatment Ice adhesion Mixed solvent (°) (°) (gf / cm) 2)Boiling point (Formula 1, ℃)Polarity (Formula 2)Example 1 1118.99 5.57 598.44.2Example 2 1118.59 4.57 699.74Example 3 2118.49 3.27 9 102.43.6Example 4 1119.19 5.18 0 78.44.5Example 5 1120.39 6.28 28 8.34.3Example 6 1119.110 0.16 0 78.44.5Example 7 1119.110 1.56 278.44.5Example 8 1120.39 6.27 788 .34.3 Example 91119.995.18188.34.3 Example 101120.496.49188.34.3 Example 11211995.688105.23.2 Example 122119.593.27177.64.4 Comparative Example 14117.496.495110.62.4 Comparative Example 23119.295.88979.64.6 Comparative Example 34105.185.11561084.0 Comparative Example 4-50-300--

[0157] Referring to Table 2 above, the coating substrates of the examples had relatively large surface contact angles and contact angles after abrasion treatment, and thus low ice adhesion.

[0158] Example 11 included a coating film formed from a composition containing a mixed solvent having too low a polarity as calculated according to Equation 2, resulting in relatively poor appearance properties. In addition, Example 12 included a coating film formed from a composition containing a mixed solvent having too low a boiling point as calculated according to Equation 1, resulting in unevenness observed on the surface of the coating film.

[0159] The coating substrates of Comparative Examples 1 to 3 included coating films prepared from compositions containing a single solvent rather than a mixed solvent. Accordingly, unevenness was formed on the surface of the coating film, resulting in a deterioration in the appearance properties.

[0160] The above description is merely an example of applying the principles of the present disclosure, and other configurations may be included without departing from the scope of the present invention.

Claims

1. Contains siloxane resin and mixed solvent, A surface coating composition, wherein the mixed solvent comprises two or more organic solvents having different boiling points or different polarities.

2. In the first paragraph, the boiling point of the mixed solvent calculated by the following formula 1 is 75 ℃ to 105 ℃, a surface coating composition: [Formula 1] (In the above equation 1, BP mix is the boiling point of the above mixed solvent, and BP k is the boiling point (℃) of any of the above organic solvents, and W k is the weight ratio of any of the organic solvents in the total weight of the composition, and n is the number of types of the organic solvents included in the mixed solvent.

3. In the first paragraph, the polarity index of the mixed solvent calculated by the following equation 2 is 3.5 to 4.5, a surface coating composition: [Formula 2] (In the above equation 1, PI mix is the polarity of the above mixed solvent, and PI k is the polarity of any of the above organic solvents, and W k is the weight ratio of any of the organic solvents in the total weight of the composition, and n is the number of types of the organic solvents included in the mixed solvent.

4. A surface coating composition in the first paragraph, wherein the organic solvent comprises at least one selected from the group consisting of a ketone solvent, an acetate solvent, an aromatic hydrocarbon solvent, an ether solvent, and an alcohol solvent.

5. A surface coating composition in the first paragraph, wherein the organic solvent includes a first organic solvent having a boiling point of 90° C. or higher and a second organic solvent having a boiling point of less than 90° C.

6. A surface coating composition in the first paragraph, wherein the organic solvent includes a first organic solvent having a polarity of 4 or more and a second organic solvent having a polarity of less than 4.

7. A composition for surface coating in claim 1, wherein the organic solvent comprises at least two selected from the group consisting of dimethyl ketone, methyl ethyl ketone, diethyl ketone, benzene, toluene, methyl toluene, xylene, ethyl acetate, n-propyl acetate, i-propyl acetate, n-butyl acetate, i-butyl acetate and t-butyl acetate.

8. In paragraph 1, the siloxane resin is A first siloxane resin having an unsaturated group bonded to each silicon atom at each terminal; and A surface coating composition comprising a second siloxane resin having hydrogen atoms each bonded to silicon atoms at both terminals.

9. A surface coating composition in claim 8, wherein the ratio of the weight of the second siloxane-based resin to the weight of the first siloxane-based resin among the total weight of the composition is 0.5 to 1.

10. A surface coating composition in claim 8, wherein the first siloxane-based resin includes a dimethyl siloxane-based resin and a vinyl methoxy siloxane-based resin.

11. A composition for surface coating, wherein the content of the siloxane resin in paragraph 1 is 10 to 30 parts by weight based on 100 parts by weight of the mixed solvent.

12. A surface coating composition according to claim 1, further comprising at least one selected from the group consisting of a catalyst, a silane compound, and a diol compound.

13. A surface coating composition in claim 12, wherein the silane compound is a trialkoxysilane compound containing a reactive group.

14. A composition for surface coating, wherein the content of the silane compound in clause 12 is 0.01 to 3 parts by weight based on 100 parts by weight of the mixed solvent.

15. Description; and A coating substrate comprising an anti-icing coating film formed from the surface coating composition of claim 1.

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