KR101903033B1 - a water repellent coating composition - Google Patents

Abstract

The present invention relates to a water-repellent coating composition and a method for manufacturing the same. More particularly, the present invention relates to a water-repellent coating composition comprising nanoparticles having a diameter of 10-200 nm, a silane coupling agent, a solvent, an acid compound and a catalyst, and a method for manufacturing the same. The present invention can provide a method for manufacturing a water-repellent coating composition which is excellent in water repellency, water resistance, weather resistance, durability and dimensional stability and can be used stably for a long period of time by minimizing moisture penetration even when woods, fibers, and construction materials are stored outdoor or penetrated by water. Further, the present invention can provide a water-repellent coating composition which forms a uniform hydrophobic coating layer on surfaces of woods, fibers, construction materials, etc. and exhibits excellent heat resistance, durability, weather resistance, water repellency, and moisture barrier properties and high contact angle.

Description

A water repellent coating composition,

More particularly, the present invention relates to a foot-receiving coating composition comprising nanoparticles having a diameter of 10 to 200 nm, a silane coupling agent, a solvent, an acid compound and a catalyst, and a process for producing the same .

Textiles, timber, and building materials have a porous and absorptive structure on the surface, so they have a high absorption capacity for water, easy penetration of water, and a sudden increase in water content.

When wood and building materials are kept outdoors or when water is immersed in water, dimensional stability, durability, strength and the like are deteriorated and corruption and corrosion progress rapidly, making it impossible to use them as materials for buildings and structures.

Accordingly, there is a desperate need to develop a coating composition for wood that can be used stably for a long period of time by minimizing the penetration of water even when the wood is stored outside or when the wood is submerged.

 In this regard, Korean Patent Laid-Open No. 10-1993-0006134 discloses a water-based composition comprising an aqueous mixture containing an alkali metal amino organic functional silicate and at least one alkali metal organosiliconate to provide water repellency to the stone and wood surface ≪ / RTI >

Korean Patent Laid-Open No. 10-2016-0004503 discloses a water-repellent coating material for phase superposition comprising 3 to 10% by weight of metal oxide particles subjected to hydrophobic surface treatment with an alkyl group and 90 to 97% by weight of alcohol, 10 to 40% by weight of a mixed solvent of a ketone type and an acetate type, and 60 to 90% by weight of an acetate type mixed solvent.

Korean Patent Laid-Open No. 10-1994-7001899 also discloses a fluoroaliphatic radical-containing poly (oxyalkylene) compound in an amount of 0.3 to 30% by weight, 0.3 to 30% by weight of an antifouling agent and 0 to 60% Water - miscible organic solvent

And water are disclosed.

However, the technique disclosed in the above document can not effectively prevent moisture penetration through the surface of wood, building materials, etc. due to poor water barrier properties, water repellency, and stain resistance of the coating agent.

In addition, it is impossible to form a uniform coating layer having excellent durability, weather resistance, water repellency, etc. on the surface of wood and building materials, and thus it can not be stably used for a long time with materials such as buildings and structures.

Korean Patent Publication No. 10-1993-0006134 Korean Patent Publication No. 10-2016-0004503 Korean Patent Publication No. 10-1994-7001899

Disclosure of Invention Technical Problem [8] Accordingly, the present invention has been made to solve the above problems of the prior art, and it is an object of the present invention to provide a water- And which can be used stably for a long period of time.

It is another object of the present invention to provide a foot-receiving coating composition which forms a uniform hydrophobic coating layer on the surfaces of wood, fibers, building materials, etc. and exhibits excellent heat resistance, durability, weatherability, water repellency, do.

According to an aspect of the present invention, there is provided a method for preparing a nanoparticle nanoparticle, (b) mixing a silane coupling agent, a solvent and an acid compound to prepare a second mixture; (c) mixing the first mixture and the second mixture to prepare a mixed solution; And (d) adding a solvent, an acid compound, and a catalyst to the mixed solution to prepare a coating composition.

In step (b), the silane coupling agent, the solvent, and the acid compound are mixed at a weight ratio of 100: 20 to 200: 10 to 50 at 30 to 100 ° C for 1 to 20 hours to form a second mixture Is produced.

In one embodiment of the present invention, the step (c) is characterized in that the mixture is prepared by mixing the first mixture and the second mixture at a weight ratio of 100: 10 to 50 at 30 to 100 ° C for 1 to 10 hours .

In one embodiment of the present invention, in the step (d), 100 to 500 parts by weight of a solvent, 1 to 10 parts by weight of an acid compound and 0.05 to 2 parts by weight of a catalyst are used for 100 parts by weight of the mixed solution.

In one embodiment of the present invention, the silane coupling agent is characterized by containing methyltrimethoxysilane, 3-glycidoxypropyltrimethoxysilane, dimethyldimethoxysilane, and octyltriethoxysilane.

The present invention also provides a foot-receiving coating composition comprising nanoparticles having a diameter of 10 to 200 nm, a silane coupling agent, a solvent, an acid compound and a catalyst.

In one embodiment of the present invention, the silane coupling agent is bonded to the surface of the nanoparticles.

In one embodiment of the present invention, the silane coupling agent is characterized by containing methyltrimethoxysilane, 3-glycidoxypropyltrimethoxysilane, dimethyldimethoxysilane, and octyltriethoxysilane.

The present invention relates to a water-absorbing coating composition which is excellent in water repellency, water resistance, stain resistance, weather resistance, durability and dimensional stability and can be stably used for a long period of time by minimizing moisture penetration even when stored in wood or fiber, A manufacturing method can be provided.

Also, the present invention can provide a foot-receiving coating composition which forms a uniform hydrophobic coating layer on the surfaces of wood, fibers, building materials and the like and exhibits excellent heat resistance, durability, weather resistance, water repellency, moisture barrier property and high contact angle.

Fig. 1 shows a coating composition (a) of Example 1 and a state (b) in which water is dropped after coating the coating composition on a wood surface.
Fig. 2 shows a coating composition (a) of Example 2 and a state (b) in which water is dropped after the coating composition is coated on a wood surface.
Fig. 3 shows a coating composition (a) of Example 3 and a state (b) in which water is dropped after coating the coating composition on a wood surface.
Fig. 4 shows a coating composition (a) of Example 4 and a state (b) in which water is dropped after coating the coating composition on a wood surface.
5 shows a coating composition (a) of Example 5 and a state (b) in which water is dropped after coating the coating composition on a wood surface.
Fig. 6 shows a coating composition (a) of Example 6 and a state (b) in which water is dropped after coating the coating composition on a wood surface.

Hereinafter, the present invention will be described in detail based on examples. It is to be understood that the terminology, examples and the like used in the present invention are merely illustrative of the present invention in order to more clearly explain the present invention and to facilitate understanding of the ordinary artisan, and should not be construed as being limited thereto.

Technical terms and scientific terms used in the present invention mean what the person skilled in the art would normally understand unless otherwise defined.

(A) mixing a nanoparticle having a diameter of 10 to 200 nm and a solvent to prepare a first mixture; (b) mixing a silane coupling agent, a solvent and an acid compound to prepare a second mixture; (c) mixing the first mixture and the second mixture to prepare a mixed solution; And (d) adding a solvent, an acid compound, and a catalyst to the mixed solution to prepare a coating composition.

In the step (a), the nanoparticles are dispersed by mixing the nanoparticles with a solvent. The nanoparticles having a diameter of 10 to 200 nm and the solvent are mixed to prepare a first mixture.

As the solvent, alcohols such as methanol, ethanol, propanol, isopropanol, and butanol can be used without limitation, and ethanol is preferably used.

As the nanoparticles, silica, alumina, zeolite, zirconia, iron oxide, magnesium oxide, calcium carbonate, mica and the like can be used without limitation, and alumina is preferably used.

The diameter of the nanoparticles is preferably 10 to 200 nm, more preferably 10 to 60 nm. When the diameter is less than 10 nm, the moisture barrier properties are deteriorated. When the diameter exceeds 200 nm, a uniform coating layer can not be formed, and durability and weather resistance are lowered.

It is preferable that 1 to 15 parts by weight of the nanoparticles are mixed with 100 parts by weight of the solvent to prepare the first mixture in view of water repellency, durability and weatherability.

The first mixture prepared through the step (a) is excellent in the dispersibility of the nanoparticles and can effectively bind the silane coupling agent to the surface of the nanoparticles through mixing with the second mixture to produce a coating composition having excellent water repellency .

The step (b) is a step of hydrolyzing a silane coupling agent by mixing a silane coupling agent, a solvent and an acid compound, wherein the silane coupling agent, the solvent, and the acid compound are mixed at a weight ratio of 100:20 to 200: And the mixture is mixed at 100 DEG C for 1 to 20 hours to prepare a second mixture.

The silane coupling agent has an organic functional group capable of binding with an organic compound and a hydrolyzable group capable of reacting with an inorganic substance, and the silane coupling agent binds to the surface of the nanoparticles and is excellent in water repellency, water resistance, moisture barrier properties, durability, Lt; / RTI >

As the silane coupling agent, an alkyl group-containing silane, an amino group-containing silane, an epoxy group-containing silane, an acrylate group-containing silane, an isocyanate group-containing silane, a fluorine group-containing silane and a vinyl group-containing silane can be used without limitation.

Examples of the alkyl group-containing silane include methyltrimethoxysilane, dimethyldimethoxysilane and octyltriethoxysilane.

Examples of the epoxy group-containing silane include 2-glycidoxyethylmethyldimethoxysilane, 2-glycidoxyethylmethyldiethoxysilane, 3-glycidoxypropylmethyldimethoxysilane, 3-glycidoxypropylmethyldiethoxysilane, 2 Glycidoxyethyltrimethoxysilane, 2-glycidoxyethyltriethoxysilane, 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropyltriethoxysilane, 2- (3,4- Epoxycyclohexyl) ethylmethyldimethoxysilane, 2- (3,4-epoxycyclohexyl) ethylmethyldiethoxysilane, 3- (3,4-epoxycyclohexyl) propylmethyldimethoxysilane, 3- 2- (3,4-epoxycyclohexyl) ethyltrimethoxysilane, 2- (3,4-epoxycyclohexyl) ethyltrimethoxysilane, 3- 4-epoxycyclohexyl) propyltrimethoxysilane, and 3- (3,4-epoxycyclohexyl) propyltriethoxysilane.

Examples of the acrylate group-containing silane include 3-methacryloxypropylmethyldimethoxysilane, 3-methacryloxypropyltrimethoxysilane, 3-methacryloxypropylmethyldiethoxysilane, 3-methacryloxypropyltriethoxysilane , 3-acryloxypropyltrimethoxysilane, methacryloxymethyltriethoxysilane, methacryloxymethyltrimethoxysilane, and the like.

Examples of the fluorine group-containing silane include heptadecafluoro-1,1,2,2-tetradecyltrimethoxysilane, trifluoropropyltrimethoxysilane, tridecafluorooctyltrimethoxysilane, heptadecafluorodecyl Trimethoxysilane, heptadecafluorodecyltriisopropoxysilane, and the like.

In order to improve the water repellency, water resistance, moisture barrier property, durability, weather resistance and the like of the coating composition, a mixed silane coupling agent of an alkyl group-containing silane and an epoxy group-containing silane is preferably used and the weight ratio of the alkyl group- 1 to 15 is preferable.

For example, methyltrimethoxysilane, dimethyldimethoxysilane, octyltriethoxysilane and 3-glycidoxypropyltrimethoxysilane may be used as the silane coupling agent, and methyltrimethoxysilane, dimethyldimethoxysilane, The weight ratio of octyltriethoxysilane is preferably 100: 10-200: 10-200.

In order to improve the water repellency, water resistance, moisture barrier property, durability and weather resistance of the coating composition, it is preferable to use an alkyl group-containing silane, an epoxy group-containing silane and a mixed silane coupling agent containing a fluorine group- The weight ratio of the silane and the fluorine group-containing silane is preferably 100: 1 to 15: 5 to 200.

For example, silane coupling agents such as methyltrimethoxysilane, dimethyldimethoxysilane, octyltriethoxysilane, 3-glycidoxypropyltrimethoxysilane and heptadecafluoro-1,1,2,2-tetradecyl Trimethoxysilane, and the weight ratio of methyltrimethoxysilane, dimethyldimethoxysilane and octyltriethoxysilane is preferably 100: 1 to 20: 1 to 20.

As the solvent, alcohols such as methanol, ethanol, propanol, isopropanol, and butanol can be used without limitation, and ethanol is preferably used.

As the acid compound, hydrochloric acid, acetic acid, sulfuric acid, nitric acid and the like can be used, and it is preferable to use them in the form of an aqueous solution. For example, 0.01N hydrochloric acid aqueous solution may be used.

The silane coupling agent, the solvent and the acid compound are preferably used in a weight ratio of 100: 20 to 200: 10 to 50 in terms of water repellency, durability and weather resistance.

The silane coupling agent, the solvent and the acid compound are mixed and reacted at 30 to 100 ° C for 1 to 20 hours to prepare a second mixture. Through this step, the alkoxy group of the silane coupling agent is hydrolyzed to form a hydroxyl group. The hydroxyl group binds to the surface of the nanoparticles contained in the first mixture to exhibit properties such as water repellency, water resistance, moisture barrier properties, durability and weatherability.

(C) mixing the first mixture and the second mixture to prepare a mixture, mixing the first mixture and the second mixture in a weight ratio of 100: 10 to 50 at 30 to 100 ° C for 1 to 10 hours To prepare a mixed solution.

The weight ratio of the first mixture and the second mixture is 100: 10 to 50, and when the weight ratio is more than 100: 10, the moisture barrier property is deteriorated because the silane coupling agent is not sufficiently bonded to the surface of the nanoparticles, A uniform coating layer can not be formed and durability and weather resistance are lowered.

The first mixture and the second mixture are mixed and reacted at 30 to 100 ° C for 1 to 10 hours to prepare a mixed solution. Through this step, the hydroxyl group of the silane coupling agent is bonded to the surface of the nanoparticles contained in the first mixture Thereby exhibiting properties such as water repellency, water resistance, moisture barrier properties, durability, and weather resistance.

(D) is a step of preparing a coating composition by adding a solvent, an acid compound, and a catalyst to the mixed solution, wherein 100 to 500 parts by weight of a solvent, 1 to 10 parts by weight of an acid compound, and 0.05 To 2 parts by weight.

As the solvent, alcohols such as methanol, ethanol, propanol, isopropanol, and butanol can be used without limitation, and ethanol is preferably used.

As the acid compound, hydrochloric acid, acetic acid, sulfuric acid, nitric acid and the like can be used, and it is preferable to use them in the form of an aqueous solution. For example, 0.01N hydrochloric acid aqueous solution may be used.

Examples of the catalyst include organic metal salts such as Cu, Fe, Co, Mn, Al, Ti, Zr and Ni such as octylic acid, stearic acid, naphthenic acid and acetylacetonate; Metal alkoxides such as Ti, Sn, Bi, Zr and Al; Phenol compounds such as octyl phenol and nonyl phenol; Alcohols such as 1-butanol and 2-ethylhexanol; Methylimidazole, 2-phenylimidazole, 1-cyanoethyl-2-phenylimidazole, 1-cyanoethyl-2-ethyl- Imidazole derivatives such as methyl-imidazole, 2-phenyl-4,5-dihydroxymethylimidazole and 2-phenyl-4-methyl-5-hydroxymethylimidazole can be used. For example, it is preferable to use aluminum acetylacetonate.

When a coating composition is coated on a substrate by using a catalyst, the coating layer is easily formed at a lower temperature, and the heat resistance and thermal stability of the coating layer are excellent.

It is preferable to use 100 to 500 parts by weight of the solvent, 1 to 10 parts by weight of the acid compound and 0.05 to 2 parts by weight of the catalyst with respect to 100 parts by weight of the mixed solution in terms of water repellency, durability and weather resistance.

The present invention also relates to a foot-receiving coating composition comprising nanoparticles having a diameter of 10 to 200 nm, a silane coupling agent, a solvent, an acid compound and a catalyst.

The silane coupling agent is chemically or physically bonded to the surface of the nanoparticles to exhibit properties such as water repellency, water resistance, moisture barrier properties, durability, and weather resistance.

It is preferable to use a mixed silane coupling agent of methyltrimethoxysilane, 3-glycidoxypropyltrimethoxysilane, dimethyldimethoxysilane and octyltriethoxysilane as the silane coupling agent.

Further, as the silane coupling agent, there may be mentioned methyltrimethoxysilane, dimethyldimethoxysilane, octyltriethoxysilane, 3-glycidoxypropyltrimethoxysilane and heptadecafluoro-1,1,2,2-tetradecyltrimethoxysilane It is preferable to use a mixed silane coupling agent.

The coating composition is excellent in water repellency, water resistance, stain resistance, weather resistance, durability, dimensional stability, and can be used stably for a long period of time by minimizing the penetration of moisture even when it is stored outside or immersed in wood, fibers and building materials.

Further, the coating composition forms a uniform hydrophobic coating layer on the surface of wood, fibers, building materials, etc., and can exhibit a high contact angle with excellent heat resistance, durability, weather resistance, water repellency, moisture barrier property and the like.

Hereinafter, the present invention will be described in detail with reference to Examples and Comparative Examples. The following examples are intended to illustrate the practice of the present invention and are not intended to limit the scope of the present invention.

(Example 1)

5 parts by weight of alumina having a diameter of 50 nm and 100 parts by weight of ethanol were mixed to prepare a first mixture.

3-glycidoxypropyltrimethoxysilane, ethanol and 0.01N hydrochloric acid aqueous solution were mixed at 60 DEG C for 12 hours to prepare a second mixture.

The first mixture and the second mixture were mixed at 60 DEG C for 4 hours to prepare a mixed solution.

Ethanol, 0.01N hydrochloric acid aqueous solution and aluminum acetylacetonate were added to the mixed solution to prepare a coating composition.

(Example 2)

A coating composition was prepared in the same manner as in Example 1 except that methyltrimethoxysilane and 3-glycidoxypropyltrimethoxysilane were used as a silane coupling agent.

(Example 3)

A coating composition was prepared in the same manner as in Example 1 except that methyltrimethoxysilane and dimethyldimethoxysilane were used as a silane coupling agent.

(Example 4)

A coating composition was prepared in the same manner as in Example 1, except that methyltrimethoxysilane, dimethyldimethoxysilane, 3-glycidoxypropyltrimethoxysilane and octyltriethoxysilane were used as silane coupling agents.

(Example 5)

A coating composition was prepared in the same manner as in Example 1, except that methyltrimethoxysilane, dimethyldimethoxysilane, 3-glycidoxypropyltrimethoxysilane and octyltriethoxysilane were used as silane coupling agents.

(Example 6)

Silane coupling agents such as methyltrimethoxysilane, dimethyldimethoxysilane, octyltriethoxysilane, 3-glycidoxypropyltrimethoxysilane and heptadecafluoro-1,1,2,2-tetradecyltrimethoxy The coating composition was prepared in the same manner as in Example 1 except that silane was used.

The water content and the contact angle of the coating composition prepared from the above examples were measured, and the results are shown in the following table.

(Water content)

The coating composition prepared according to the examples was coated on the surface of wood and dried. Then, 2.5 g of water was dropped on the surface of the wood on which the coating layer was formed, and water content was measured.

Moisture content is measured according to KS F 2199, which represents the amount of moisture contained in the solid.

The water content is calculated by the following formula.

Moisture content (%) = (m1-m2) / m2 x 100

(m1 is the mass of the test piece before drying, and m2 is the mass after drying of the test piece)

(Contact angle)

The coating composition prepared according to the example was coated on the surface of wood and dried. Then, water was dropped on the surface of the wood on which the coating layer was formed, and then the contact angle was measured.

The contact angle was measured according to KS L 2110.

Example 1 1-1 1-2 1-3 1-4 The first mixture 100 100 100 100 The second mixture 3-glycidoxypropyltrimethoxysilane 12.74 12.74 42.46 42.46 ethanol 15.00 15.00 50.00 50.00 0.01 N hydrochloric acid aqueous solution 2.90 2.90 9.70 9.70 0.01 N hydrochloric acid aqueous solution 1.50 1.50 1.50 1.00 ethanol 250 250 250 250 Aluminum acetylacetonate 0.10 1.00 0.10 1.00 Moisture content (%) 14.32 14.27 13.99 13.09 Contact angle (°) 15.00 17.00 27.00 25.00

Example 2 2-1 2-2 2-3 The first mixture 100 100 100 The second mixture Methyltrimethoxysilane 3.05 9.15 15.25 3-glycidoxypropyltrimethoxysilane 10.61 6.37 2.12 ethanol 16.34 14.48 12.63 0.01 N hydrochloric acid aqueous solution 3.64 5.09 6.54 0.01 N hydrochloric acid aqueous solution 1.50 1.50 1.50 ethanol 250 250 250 Aluminum acetylacetonate 1.00 1.00 1.00 Moisture content (%) 13.99 13.65 14.20 Contact angle (°) 34.00 32.00 36.00

Example 3 3-1 3-2 3-3 The first mixture 100 100 100 The second mixture Methyltrimethoxysilane 15.25 9.15 3.05 Dimethyldimethoxysilane 2.88 8.65 14.42 ethanol 5.00 5.00 5.00 0.01 N hydrochloric acid aqueous solution 7.30 7.50 7.70 0.01 N hydrochloric acid aqueous solution 1.50 1.50 1.50 ethanol 250 250 250 Aluminum acetylacetonate 1.00 1.00 1.00 Moisture content (%) 12.53 12.95 12.90 Contact angle (°) 62.00 69.00 79.00

Example 4 4-1 4-2 4-3 The first mixture 100 100 100 The second mixture Methyltrimethoxysilane 12.20 9.15 3.05 3-glycidoxypropyltrimethoxysilane 1.70 1.70 1.70 Dimethyldimethoxysilane 1.73 3.17 6.06 Octyltriethoxysilane 1.45 2.66 5.08 ethanol 8.00 9.00 10.00 0.01 N hydrochloric acid aqueous solution 4.50 4.40 4.30 0.01 N hydrochloric acid aqueous solution 1.50 1.50 1.50 ethanol 250 250 250 Aluminum acetylacetonate 1.00 1.00 1.00 Moisture content (%) 12.55 12.32 12.25 Contact angle (°) 82.00 92.00 94.00

Example 5 5-1 5-2 5-3 The first mixture 100 100 100 The second mixture Methyltrimethoxysilane 12.20 9.15 0.61 3-glycidoxypropyltrimethoxysilane 0.42 0.42 0.42 Dimethyldimethoxysilane 2.60 4.04 8.08 Octyltriethoxysilane 2.18 3.39 6.77 ethanol 8.00 9.00 10.00 0.01 N hydrochloric acid aqueous solution 4.50 4.40 4.30 0.01 N hydrochloric acid aqueous solution 1.50 1.50 1.50 ethanol 250 250 250 Aluminum acetylacetonate 1.00 1.00 1.00 Moisture content (%) 12.13 12.03 11.32 Contact angle (°) 83.00 85.00 100.30

Example 6 6-1 6-2 6-3 The first mixture 100 100 100 The second mixture Methyltrimethoxysilane 12.20 9.15 3.05 3-glycidoxypropyltrimethoxysilane 0.42 0.42 0.42 Dimethyldimethoxysilane 0.58 0.58 0.58 Octyltriethoxysilane 0.48 0.48 0.48 Heptadecafluoro-1,1,2,2-tetradecyltrimethoxysilane 1.00 2.67 7.33 ethanol 8.00 9.00 10.00 0.01 N hydrochloric acid aqueous solution 4.50 4.40 4.30 0.01 N hydrochloric acid aqueous solution 1.50 1.50 1.50 ethanol 250 250 250 Aluminum acetylacetonate 1.00 1.00 1.00 Moisture content (%) 11.14 11.13 10.79 Contact angle (°) 112.00 115.00 118.10

From the results shown in Tables 1 to 6, it can be seen that when the coating compositions of Examples 4 to 6 are coated on the surface of wood, the water content is low and the contact angle is increased. In particular, in Example 6, (Figs. 4 to 6).

Therefore, the coating compositions of Examples 4 to 6 are excellent in water repellency, water resistance, stain resistance, weather resistance, durability, and dimensional stability, so that the penetration of moisture is minimized even when wood, fiber, and building materials are stored outdoors or flooded, .

On the other hand, Examples 1 to 3 show that the moisture barrier properties are somewhat inferior to those of Examples 4 to 6 (Figs. 1 to 3).

Claims (8)

(a) mixing a nanoparticle having a diameter of 10 to 200 nm and a solvent to prepare a first mixture;
(b) mixing a silane coupling agent, a solvent and an acid compound to prepare a second mixture;
(c) mixing the first mixture and the second mixture to prepare a mixed solution; And
(d) adding a solvent, an acid compound and a catalyst to the mixed solution to prepare a coating composition,
In the step (b), the silane coupling agent, the solvent and the acid compound are mixed at a weight ratio of 100:20 to 200:10 to 50 at 30 to 100 ° C for 1 to 20 hours to prepare a second mixture,
In the step (c), the mixture is prepared by mixing the first mixture and the second mixture at a weight ratio of 100: 10 to 50 at 30 to 100 ° C for 1 to 10 hours,
(D) is performed by using 100 to 500 parts by weight of a solvent, 1 to 10 parts by weight of an acid compound, and 0.05 to 2 parts by weight of a catalyst with respect to 100 parts by weight of the mixed solution,
The silane coupling agent is selected from the group consisting of methyltrimethoxysilane, dimethyldimethoxysilane, octyltriethoxysilane, 3-glycidoxypropyltrimethoxysilane and heptadecafluoro-1,1,2,2-tetradecyltrimethane Lt; RTI ID = 0.0 > siloxane < / RTI > coupling agent,
The weight ratio of methyltrimethoxysilane, dimethyldimethoxysilane and octyltriethoxysilane is 100: 1 to 20: 1 to 20,
1 to 15 parts by weight of 3-glycidoxypropyltrimethoxysilane and 1 to 15 parts by weight of heptadecafluoro-1,1, 2, 3, 4, 5, 6 and 10 parts by weight based on 100 parts by weight of the total amount of methyltrimethoxysilane, dimethyldimethoxysilane and octyltriethoxysilane. , And 5 to 200 parts by weight of 2-tetradecyltrimethoxysilane are used.
delete delete delete delete 11. A foot-releasing coating composition produced by the method of claim 1,
A nanoparticle having a diameter of 10 to 200 nm, a silane coupling agent, a solvent, an acid compound and a catalyst,
The silane coupling agent binds to the surface of the nanoparticles,
The silane coupling agent is selected from the group consisting of methyltrimethoxysilane, dimethyldimethoxysilane, octyltriethoxysilane, 3-glycidoxypropyltrimethoxysilane and heptadecafluoro-1,1,2,2-tetradecyltrimethane Lt; RTI ID = 0.0 > siloxane < / RTI > coupling agent,
The weight ratio of methyltrimethoxysilane, dimethyldimethoxysilane and octyltriethoxysilane is 100: 1 to 20: 1 to 20,
1 to 15 parts by weight of 3-glycidoxypropyltrimethoxysilane and 1 to 15 parts by weight of heptadecafluoro-1,1, 2, 3, 4, 5, 6 and 10 parts by weight based on 100 parts by weight of the total amount of methyltrimethoxysilane, dimethyldimethoxysilane and octyltriethoxysilane. And 5 to 200 parts by weight of 2-tetradecyltrimethoxysilane are used.
delete delete

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