KR20190129206A - coating composition for Building Materials preparation method thereof - Google Patents

Abstract

The present invention relates to a coating composition for building materials and to a production method thereof. The coating composition comprises two or more silane compounds, an organic solvent, a silicone resin, and a curing catalyst. Cracks generated after completely curing a coating liquid which is exposed to air at room temperature are prevented by adjusting the content of each component. In addition, the coating composition has excellent transparency, hardness, smoothness, and antifouling properties.

Description

Coating composition for building materials and manufacturing method thereof

The present invention relates to a coating material composition for building materials and a method for manufacturing the same. More specifically, a specific silane compound is blended in a constant ratio, and, including a silicone resin, cracks generated after the coating liquid exposed to air is completely cured. The present invention relates to a coating composition having an effect of preventing, excellent in transparency, hardness, smoothness, and antifouling property, and a manufacturing method thereof.

Since silicone-based coating agents manufactured based on organic silanes have excellent chemical, physical and electrical properties, they have been applied to various fields such as electrical, electronic, aviation, and building materials.

Generally, the surface hardness of the coating surface should be greatly improved under the conditions of the coating agent, and the weather resistance and chemical resistance of the coating surface should be improved by firmly attaching and bonding the coating material. However, existing silicone coatings are limited to contamination sources with limited contamination levels, and when curing is performed at low temperatures, they are difficult to use due to their poor fouling resistance and coating performance, resulting in problems of deterioration in durability and abrasion resistance caused by long time installation. There was a problem that the use is limited.

 Recently, in order to solve the above problems, research on the development of a thermosetting resin and a coating process having hardness, weather resistance and adhesiveness through inorganic coating has been continuously conducted, and the most popular field is metal alkoxide sol. It is a thermosetting hard coating agent manufactured by the gel method.

However, the thermosetting coating prepared by the sol-gel method causes cracks due to the rapid shrinkage that occurs during the metal alkoxide sol-gel reaction, and the type and amount of the catalyst in the solution or the type and concentration of the silane compound and the functional group. There is a limit in which the rate of hydrolysis varies depending on the effect.

Therefore, there is an urgent need to develop a coating agent having excellent durability, transparency and water repellency while preventing cracks generated after curing.

Korean Patent No. 0895052 Korean Patent No. 1468382 Republic of Korea Patent Publication No. 2016-0112114

An object of the present invention is to provide a coating composition having an effect of preventing the cracks generated after the complete curing of the coating liquid exposed to air at room temperature, and excellent transparency, hardness, smoothness, and antifouling properties.

Still another object of the present invention is to provide a method for preparing the coating composition.

In order to achieve the above object, the present invention is (A) 10 to 40% by weight of the silane compound represented by the formula (1), (B) 0.1 to 5% by weight of the silane compound represented by the formula (2), (C) the organic solvent 25 To 60% by weight, (D) 0.1 to 30% by weight of the silicone resin represented by the following formula (3) and 0.1 to 5% by weight of the (E) curing catalyst, characterized in that obtained by the reaction.

[Formula 1]

R ¹ Si (OR ² ) ₃

(In Formula 1, R ¹ And Each R ² is independently selected from an alkyl group of C1-C6, an alkenyl group of C2-C6, a halogenated alkyl group of C1-C6 and an allyl group of C2-C6)

[Formula 2]

R ³ Si (OR ⁴ ) ₃

(In Formula 2, R ³ is an alkyl group of C7-C20 or an aryl group of C6-C20, R ⁴ is C1-C6 alkyl group, C2-C6 alkenyl group, C1-C6 halogenated alkyl group and C2-C6 allyl group)

 [Formula 3]

(In Formula 3, each R is independently C1-10 Alkyl, or C6-10 aryl, R 'is C1-10 Alkyl, n is an integer of 1 to 200,000)

The coating composition is characterized in that the weight ratio (A: B) of the silane compound represented by the formula (A) and the silane compound represented by the formula (B) is 1: 1 to 15: 1.

The organic solvent (C) is methanol, ethanol, n-propyl alcohol, isopropyl alcohol, n-butyl alcohol, sec-butyl alcohol, t-butyl alcohol, n-hexyl alcohol, n-octyl alcohol, ethylene glycol, diethylene Glycol, triethylene glycol, ethylene glycol monobutyl ether, ethylene glycol monoethyl ether acetate, diethylene glycol monoethyl ether, propylene glycol monomethyl ether, propylene glycol monomethyl ether acetate, diacetone alcohol, methyl cellosolve, ethyl cell At least one selected from the group consisting of rosolve, propyl cellosolve and butyl cellosolve.

The silicone resin (D) is characterized in that the viscosity of 20 to 50 cst at 25 ℃.

The (E) curing catalyst is aluminum ethoxide, tantalum ethoxide, germanium ethoxide, titanium ethoxide, zirconium ethoxide, zirconium propoxide, titanium propoxide, aluminum isopropoxide , Germanium isopropoxide, titanium isopropoxide, zirconium isopropoxide, aluminum tributoxide, tantalum butoxide, aluminum t-butoxide, titanium butoxide, titanium t-butoxide, zirconium butoxide and zirconium It is characterized in that at least one member selected from the group consisting of t-butoxide.

The coating composition is characterized in that (F) further comprises 0.1 to 5% by weight of the hydroxyl group-containing polysiloxane represented by the general formula (4) in the total composition.

[Formula 4]

(In Formula 4, R ₁ and R ₃ are each independently a single bond or a hydrocarbon group of 1 to 25 carbon atoms, R ₂ are each independently an alkyl group, a cycloalkyl group or a phenyl group, a is an integer of 10 or more, b, c are each independently an integer of 0 to 3, and the sum of b and c is 1 or more.)

In addition, the preparation method of the coating composition of the present invention (A) 10 to 40% by weight of the silane compound represented by the following formula (1), (B) 0.1 to 5% by weight of the silane compound represented by the formula (2); And (C) reacting the organic solvent by mixing 25 to 60 wt%;

(C) adding 0.1 to 30% by weight of the silicone resin represented by the following Chemical Formula 3 to the solution containing the organic solvent; And (E) adding 0.1 to 5% by weight of a curing catalyst.

[Formula 1]

R ¹ Si (OR ² ) ₃

(In Formula 1, R ¹ And Each R ² is independently selected from an alkyl group of C1-C6, an alkenyl group of C2-C6, a halogenated alkyl group of C1-C6 and an allyl group of C2-C6)

[Formula 2]

R ³ Si (OR ⁴ ) ₃

(In Formula 2, R ³ is an alkyl group of C7-C20 or an aryl group of C6-C20, R ⁴ is C1-C6 alkyl group, C2-C6 alkenyl group, C1-C6 halogenated alkyl group and C2-C6 allyl group)

[Formula 3]

(In Formula 3, each R is independently C1-10 Alkyl, or C6-10 aryl, R 'is C1-10 Alkyl, n is an integer of 1 to 200,000)

According to the present invention, the coating liquid exposed in the air prevents cracks generated after complete curing, and has an effect of providing a coating composition having an effect of excellent transparency, hardness, smoothness, and antifouling property.

Hereinafter, the present invention will be described in detail.

The coating composition for building materials of the present invention is (A) 10 to 40% by weight of the silane compound represented by the formula (1), (B) 0.1 to 5% by weight of the silane compound represented by the formula (2), (C) 25 to the organic solvent 60 wt%, (D) 0.1 to 30 wt% of the silicone resin represented by the following formula (3) and 0.1 to 5 wt% of the (E) curing catalyst, characterized in that obtained by the reaction.

[Formula 1]

R ¹ Si (OR ² ) ₃

(In Formula 1, R ¹ And Each R ² is independently selected from an alkyl group of C1-C6, an alkenyl group of C2-C6, a halogenated alkyl group of C1-C6 and an allyl group of C2-C6)

[Formula 2]

R ³ Si (OR ⁴ ) ₃

(In Formula 2, R ³ is an alkyl group of C7-C20 or an aryl group of C6-C20, R ⁴ is C1-C6 alkyl group, C2-C6 alkenyl group, C1-C6 halogenated alkyl group and C2-C6 allyl group)

[Formula 3]

(In Formula 3, R is each independently C1-10 Alkyl, or C6-10 aryl,

R 'is C1-10 alkyl, n is an integer from 1 to 200,000)

Hereinafter, each structure is demonstrated in detail.

(A) The silane compound represented by General formula (1)

The silane compound represented by the following Formula 1 may be included in 10 to 40% by weight, or 20 to 40% by weight, preferably 30 to 40% by weight in the total composition, crack generation in the coating film cured within this range and The peeling phenomenon is reduced and the water repellency and the easy clean function of the dried coating film are excellent. Particularly, if it exceeds 40% by weight, cracks and peeling phenomena occur in the cured coating film, and hardness is lowered below 10% by weight.

[Formula 1]

R ¹ Si (OR ² ) ₃

(In Formula 1, R ¹ And Each R ² is independently selected from an alkyl group of C1-C6, an alkenyl group of C2-C6, a halogenated alkyl group of C1-C6 and an allyl group of C2-C6)

As a specific example, in [Formula 1], R ¹ and R ² may be each independently an alkyl group of C 1 -C 3, in which case the smoothness, transparency and hardness of the coating film are excellent.

In one example, the (A) silane compound represented by the formula (1) is methyl trimethoxy silane, methyl triethoxy silane, vinyl trimethoxy silane, vinyl triethoxy silane, dimethyl dimethoxy silane, dimethyl diethoxy silane, vinyl Group consisting of methyl dimethoxy silane, butyl trimethoxy silane, diphenyl ethoxy vinylsilane, methyl triisopropoxy silane, methyl triacetoxy silane, tetraphenoxy silane, tetrapropoxy silane and vinyl triisopropoxy silane It may be one or more selected from.

(B) Silane Compound Represented by Formula (2)

The present invention includes a silane compound represented by the following formula (B) to improve the transparency and water repellency of the coating agent.

[Formula 2]

R ³ Si (OR ⁴ ) ₃

(In Formula 2, R ³ is an alkyl group of C7-C20 or an aryl group of C6-C20, R ⁴ is C1-C6 alkyl group, C2-C6 alkenyl group, C1-C6 halogenated alkyl group and C2-C6 allyl group)

As a specific example, in Formula 2, R ³ is an alkyl group of C7-C20 or an aryl group of C6-C20, R ⁴ may be an alkyl group of C1-C6, in this case it is excellent in transparency, water repellency and antifouling properties.

The (B) silane compound represented by Formula 2 may be included in 0.1 to 5% by weight, or 0.3 to 5% by weight, preferably 1 to 5% by weight in the total composition, the transparency of the coating film cured within this range This improves and has an excellent effect of water repellency, antifouling property and hardness.

As another example, the silane compound represented by Formula 2 may be used by mixing a silane compound represented by Formula 2-1 and a silane compound represented by Formula 2-2.

[Formula 2-1]

R ³ Si (OR ⁴ ) ₃

(In Formula 2-1, R ³ is an alkyl group of C7-C20, R ⁴ is C1-C6 alkyl group)

[Formula 2-2]

R ³ Si (OR ⁴ ) ₃

(In Formula 2-2, R ³ is an aryl group of C6-C20, R ⁴ is an alkyl group of C1-C6.)

In this case, the silane compound represented by Formula 2-1 may be included in 0.1 to 9% by weight, or 0.3 to 4% by weight, preferably 0.3 to 3% by weight in the total composition, in which case the transparency of the coating is improved. It is effective.

In addition, the silane compound represented by the following Chemical Formula 2-2 may be included in 0.1 to 3% by weight, or 0.1 to 3% by weight, preferably 0.5 to 3% by weight in the total composition, in which case the water repellency and antifouling properties are improved It works. In particular, when used in excess of 3% by weight there is a problem that the transparency and hardness of the coating film is lowered.

The coating composition is, for example, the weight ratio (A: B) of the silane compound represented by Formula (A) (1) and the silane compound represented by Formula (B) 2 is 1: 1 to 15: 1, or 5: 1 To 12: 1, preferably 7: 1 to 10: 1, there is an effect that the occurrence of cracks and peeling phenomenon is reduced within this range, water repellency, antifouling properties, transparency and hardness is improved.

(C) organic solvent

The present invention had a problem in that the transparency and strength of the coating film deteriorated when the conventional Stodard solvent series was used as a solvent, and in the present invention, to solve this problem, such as ketones, alcohols, cellosolves, and the like (C). An organic solvent was used.

The organic solvent, for example, may be included in 25 to 60% by weight, or 30 to 55% by weight, preferably 33 to 50% by weight in the total coating composition, within the range of the viscosity of the coating composition and the thickness of the coating film There is an effect that can be optimized.

The organic solvent is, for example, methanol, ethanol, n-propyl alcohol, isopropyl alcohol, n-butyl alcohol, sec-butyl alcohol, t-butyl alcohol, n-hexyl alcohol, n-octyl alcohol, ethylene glycol, diethylene Glycol, triethylene glycol, ethylene glycol monobutyl ether, ethylene glycol monoethyl ether acetate, diethylene glycol monoethyl ether, propylene glycol monomethyl ether, propylene glycol monomethyl ether acetate, diacetone alcohol, methyl cellosolve, ethyl cell It may be at least one selected from the group consisting of rosolve, propyl cellosolve and butyl cellosolve.

As a specific example, the organic solvent is selected from the group consisting of methanol, ethanol, n-propyl alcohol, isopropyl alcohol, n-butyl alcohol, sec-butyl alcohol, t-butyl alcohol, n-hexyl alcohol and n-octyl alcohol It may be one or more, and considering the storage stability and transparency and smoothness, it is preferable to use methanol, ethanol, n-propyl alcohol, isopropyl alcohol.

In this invention, the said (C) organic solvent may be used individually by 1 type, and can be used in combination of 2 or more type.

(D) silicone resin

When only the silane-based compound is used in the coating composition, cracks and peeling phenomenon are caused by shrinkage during the curing process, and in order to solve the problem, the present invention is intended to prevent cracks and peeling and to obtain a stable cured surface ( D) It includes a silicone resin represented by the following formula (3).

[Formula 3]

(In Formula 3, each R is independently C1-10 Alkyl, or C6-10 aryl, R 'is C1-10 Alkyl, n is an integer of 1 to 200,000)

In one embodiment, in Formula 3, each R is independently methyl or phenyl.

In another example, R may be all methyl, or the ratio of phenyl to methyl (phenyl / methyl) in the entirety of R may be 1: 1 to 1: 5, n may be an integer from 1 to 1,000, in which case the coating It is effective in preventing cracks and peeling and excellent adhesion.

The (D) silicone resin may be included in 0.1 to 30% by weight, or 15 to 30% by weight, preferably 15 to 28% by weight in the total coating composition, within this range to prevent cracking of the coating composition and adhesion There is an effect to be improved.

The silicone resin (D) may have a viscosity measured according to CTM (Corporate test method) 0004 at 25 ° C of 20 to 50cst, or 20 to 40cst, preferably 25 to 35cst, and the physical properties of the coating film within this range. And the hardness is excellent effect, when the viscosity is less than 20 cst high spreadability is difficult to form a coating film.

The silicone resin (D) may have a molecular weight of 2,000 or less, 1,500 or less, and preferably 1,000 or less, based on CTM 0553, to prevent cracking of the coating composition and to improve adhesion within this range.

The silicone resin (D) may have a silicon content measured based on CTM 0553 of 60 to 80 ww%, or 65 to 75 ww%, preferably 70.0 to 74.0 ww%, to prevent cracking of the coating composition within this range. And the water repellency and the adhesive force is improved.

In addition, the (D) silicone resin may have a specific gravity measured based on CTM 0001A at 0.5 to 2, or 0.7 to 1.5, preferably 1 to 1.3 at 25 ° C. Excellent effect.

(E) curing catalyst

The curing catalyst, for example, may be included in 0.1 to 5% by weight, or 1 to 5% by weight, preferably 2 to 4% by weight in the total coating composition, within this range the effect of excellent transparency, antifouling properties of the coating composition There is.

The curing catalyst is aluminum ethoxide, tantalum ethoxide, germanium ethoxide, titanium ethoxide, zirconium ethoxide, zirconium propoxide, titanium propoxide, aluminum isopropoxide, germanium iso Propoxide, titanium isopropoxide, zirconium isopropoxide, aluminum tributoxide, tantalum butoxide, aluminum t-butoxide, titanium butoxide, titanium t-butoxide, zirconium butoxide and zirconium t-butoxide It may be at least one selected from the group consisting of the side.

As a specific example, the curing group may be at least one selected from the group consisting of aluminum ethoxide, titanium ethoxide, titanium propoxide, titanium isopropoxide, titanium butoxide, and titanium t-butoxide, in this case There is an effect excellent in transparency and antifouling property of the coating composition.

In the present invention, for example, a metal chelating agent may be further added to control the reaction of the metal alkoxide when the curing catalyst is added.

As the metal chelating agent, for example, β-diketonate compound such as acetylacetone, or an organic acid having an unsaturated hydrocarbon group such as acrylic acid and methacrylic acid can be used, and the amount of the alkoxide group of the metal alkoxide is adjusted so that the alkoxide group is replaced with the metal chelating agent. In particular, the addition of 0.1 to 3 equivalents, or 0.2 to 0.5 equivalents to the alkoxide of the metal alkoxide, is particularly preferred in the reaction system to react with the organosilanediol at an appropriate reaction rate so that the metal components are uniform in the inorganic mesh structure. There is an effect that can be dispersed.

 (F) hydroxyl-containing polysiloxane

In the present invention, in order to improve water repellency and fouling resistance of the coating composition, (F) hydroxyl group-containing polysiloxane may be further included.

The said (F) hydroxyl group containing polysiloxane of this invention differs from the said (D) silicone resin.

The hydroxyl group-containing polysiloxane (F) may have one or more hydroxyl groups at its terminals. The hydroxyl group-containing polysiloxane may be, for example, a compound represented by the following formula (4).

[Formula 4]

(In Formula 4, R1 and R3 are each independently a single bond or a hydrocarbon group of 1 to 25 carbon atoms, R2 is each independently an alkyl group, a cycloalkyl group or a phenyl group, a is an integer of 10 or more, b, c are each Independently an integer from 0 to 3, wherein the sum of b and c is at least 1.)

In Formula 4, R ₂ may be each independently an alkyl group, a cycloalkyl group, or a phenyl group. The alkyl group may be, for example, an alkyl group having 1 to 15 carbon atoms or an alkyl group having 1 to 10 carbon atoms, preferably 1 to 4 carbon atoms, and a methyl group is most preferable in consideration of hydrophobicity, stain resistance, and transparency of the coating agent.

As an example in Formula 4, a may be an integer of 10 or more, specifically 10 to 200, more specifically, an integer of 10 to 120.

The hydroxyl group-containing polysiloxane may be, for example, a compound having a hydroxyl group at the terminal of polysiloxane, such as polydimethylsiloxane, polydiethylsiloxane, polymethylphenylsiloxane, or the like, and specifically, polydimethylsiloxane having a hydroxyl group at the terminal may be used.

Examples of the polydimethylsiloxane having a hydroxyl group at the terminal are, for example, a polydimethylsiloxane monool having one hydroxyl group at one end, a polydimethylsiloxane diol having two hydroxyl groups at one end, and one hydroxyl group at each end. Branched polydimethylsiloxane diol and the like.

The hydroxyl group-containing polysiloxane (F) is, for example, may have a viscosity of 20 to 60 cSt, or 20 to 50 cSt, preferably 35 to 45 cSt at 25 ℃, water repellency and fouling resistance is improved within this range It is effective.

The hydroxyl group-containing polysiloxane (F) may be included, for example, in 0.1 to 5% by weight, or 0.1 to 4% by weight, preferably 0.5 to 3% by weight in the total coating composition, the transparency of the coating composition within this range The hydrophobic and antifouling properties are excellent.

The coating composition of the present invention is a coating composition having excellent durability, transparency and water repellency while preventing cracks generated after curing, and is particularly suitable for use as a building material.

In addition, the coating composition of the present invention is excellent in flexibility, flexibility, high hardness and transparency, and is suitable for use in coating various glass, plastic films and film papers.

Method for producing a coating composition of the present invention is (A) 10 to 40% by weight of the silane compound represented by the formula (1), (B) 0.1 to 5% by weight of the silane compound represented by the formula (2); And (C) reacting the organic solvent by mixing 25 to 60 wt%; (C) adding 0.1 to 30% by weight of the silicone resin represented by the following Chemical Formula 3 to the solution containing the organic solvent; And (E) adding 0.1 to 5% by weight of a curing catalyst.

 [Formula 1]

R ¹ Si (OR ² ) ₃

(In Formula 1, R ¹ And Each R ² is independently selected from an alkyl group of C1-C6, an alkenyl group of C2-C6, a halogenated alkyl group of C1-C6 and an allyl group of C2-C6)

[Formula 2]

R ³ Si (OR ⁴ ) ₃

(In Formula 2, R ³ is an alkyl group of C7-C20 or an aryl group of C6-C20, R ⁴ is C1-C6 alkyl group, C2-C6 alkenyl group, C1-C6 halogenated alkyl group and C2-C6 allyl group)

[Formula 3]

(In Formula 3, each R is independently C1-10 Alkyl, or C6-10 aryl, R 'is C1-10 Alkyl, n is an integer of 1 to 200,000)

In addition, the method for preparing a coating composition of the present invention may further comprise the step of adding a (F) hydroxyl group-containing polysiloxane represented by the formula (4).

[Formula 4]

(In Formula 4, R ₁ and R ₃ are each independently a single bond or a hydrocarbon group of 1 to 25 carbon atoms, R ₂ are each independently an alkyl group, a cycloalkyl group or a phenyl group, a is an integer of 10 or more, b, c are each independently an integer of 0 to 3, and the sum of b and c is 1 or more.)

Hereinafter, preferred examples are provided to help understanding of the present invention, but the following examples are merely to illustrate the present invention and are not intended to limit the present invention thereto.

EXAMPLE

Example  One

 Nitrogen purging is carried out to remove air and water in the stirring vessel, and then 33 to 50 wt% of isopropyl alcohol is added to the total weight, and then the mixture of methyl trimethoxysilane and methyl triethoxysilane is 30 to 40 wt%. The solution was stirred to a constant composition. After adding octyl triethoxysilane at 0.3 to 2wt%, the mixture is stirred, after which the alkoxy siloxane is made to have a composition of 20 to 28wt%, stirred for 30 minutes, and then the metal alkoxide catalyst is added at 1 to 5wt% to finally room temperature. A water-repellent coating solution curable was prepared.

Example  2

In Example 1, the alkoxy siloxane is 20 to 28wt% composition and stirred for 30 minutes, after adding 0.5 to 3wt% of dimethylpolysiloxane having a hydroxyl group, except for stirring for 1 hour under a nitrogen atmosphere In the same manner as in Example 1, a water-repellent transparent coating liquid curable at room temperature was prepared.

Example  3

In Example 1, 0.3 to 2 wt% of octyl triethoxysilane was added at 0.3 to 2 wt% of octyl triethoxysilane and 1 to 3 wt% of trimethoxyphenylsilane, and 20 to 28 wt% of alkoxy siloxane. After the composition for 30% and stirred for 30 minutes, after adding 0.5 ~ 3wt% of dimethylpolysiloxane having a hydroxyl group, it was curable at room temperature in the same manner as in Example 1 except that the mixture was stirred under nitrogen atmosphere for 1 hour. A water repellent transparent coating solution was prepared.

Comparative example  One

In Example 1, except that 20wt% of isopropyl alcohol was prepared, the coating solution was prepared in the same manner as in Example 1.

Comparative example  2

In Example 2, a coating solution was prepared in the same manner as in Example 2, except that 6 wt% of octyl triethoxysilane was added.

Comparative example  3

In Example 2, a coating solution was prepared in the same manner as in Example 2, except that 45 wt% of a mixture of methyltrimethoxysilane and methyltriethoxysilane was added.

Comparative example  4

In Example 2, the coating solution was prepared in the same manner as in Example 2, except that the metal alkoxide catalyst was added at 8 wt%.

 Experimental Example

The coating liquid prepared in Examples and Comparative Examples was cured to measure the transparency, smoothness, porosity, decontamination property and hardness according to the following measuring method, and the results are shown in the following [Table 1].

How to measure

* Transparency: Using UV / Vis spectroscopy (JASCO, V-650), measuring the transmittance (%) value at 550 nm under an air atmosphere in the range of 350-800 nm and measuring transparency according to the following criteria. Determined.

(Circle): When the transmittance value is more than 95, (triangle | delta): When the transmittance value is 90-95 or less, X: When the transmittance value is less than 90

* Smoothness

It measured using the confocal microscope PLμ2300. Surface smoothness was measured by the value of the square average surface roughness (rms) which is an index of unevenness, and smoothness was determined according to the following criteria.

(Circle): Surface roughness 0.4 micrometer or less, (triangle | delta): Surface roughness more than 0.4 micrometer-0.7 micrometer or less X: Surface roughness more than 0.7 micrometer

* Pore: The composition of the above Examples and Comparative Examples was coated with a thickness of 200 μm on an iron plate base by an airless spray method, and cured at room temperature for 24 hours, and then the microstructure of the cross section was observed by the scanning electron microscope for pore generation. Pore generation was determined according to the following criteria.

○: no pore occurrence, △: number of pores observed from 1 to 3, X: number of pores observed at 4 or more

* Decontamination property: Using the red and black color of commercially available name pens, the coating composition of Examples and Comparative Examples was cured, and a line was formed. Then, the name pen was reciprocated five times with a force of 1 kgf using a Kim wipe. The dirt of the treated surface was wiped off, and the dirt which adhered by visual inspection was determined according to the following reference | standard.

○: All the dirt can be wiped off, △: Almost all the dirt can be wiped off, but some traces remain, X: The dirt remains and traces remain clearly

* Hardness: According to ASTM D3363, using a Mitsubishi evaluation pencil (UNI) with a pencil hardness tester (Shinto Scientific, Heidon) at 500kg / cm2 load, 0.5mm / sec speed, and then check the pencil hardness, Hardness was determined as "(circle)" when hardness was 3H or more, "△" when hardness was more than H or less than 3H, and "X" when hardness was less than H.

division Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Transparency ○ ○ ○ △ △ X ○ Smoothness ○ ○ ○ X ○ X △ pore △ △ ○ △ ○ X X Decontamination △ ○ ○ ○ ○ X X Hardness ○ ○ ○ △ X X ○

As shown in Table 1, in Examples 1 to 3 according to the present invention, it was confirmed that the transparency, smoothness, pores, decontamination property and hardness are excellent.

On the other hand, in the case of Comparative Example 1 in which the content of the solvent is out of the range of the present invention, it was confirmed that a non-uniform coating solution was formed, and partial gelation occurred to deteriorate smoothness.

In addition, in the case of Comparative Example 2 in which the triethoxyoctylsilane exceeded the scope of the present invention, the hardness was significantly deteriorated, and in the case of Comparative Example 3 in which the compound represented by Formula 2 exceeded the scope of the present invention, transparency was It was lowered and the film was not formed, and evaluation was impossible.

In addition, in the case of Comparative Example 4 in which the amount of the alkoxy catalyst was outside the scope of the present invention, the pores increased, and it was confirmed that decontamination property was deteriorated.

Claims (8)

(A) 10 to 40% by weight of the silane compound represented by the following formula (1),
(B) 0.1 to 5% by weight of the silane compound represented by the following formula (2),
(C) 25 to 60% by weight of an organic solvent,
(D) 0.1 to 30% by weight of the silicone resin represented by the following formula (3) and
(E) Coating composition for building materials, characterized in that obtained by reacting containing 0.1 to 5% by weight curing catalyst.
[Formula 1]
R ¹ Si (OR ² ) ₃
(In Formula 1, R ¹ And Each R ² is independently selected from an alkyl group of C1-C6, an alkenyl group of C2-C6, a halogenated alkyl group of C1-C6 and an allyl group of C2-C6)
[Formula 2]
R ³ Si (OR ⁴ ) ₃
(In Formula 2, R ³ is an alkyl group of C7-C20 or an aryl group of C6-C20, R ⁴ is C1-C6 alkyl group, C2-C6 alkenyl group, C1-C6 halogenated alkyl group and C2-C6 allyl group)
[Formula 3]

(In Formula 3, each R is independently C1-10 Alkyl, or C6-10 aryl, R 'is C1-10 Alkyl, n is an integer of 1 to 200,000)
The method of claim 1,
The coating composition is a building material characterized in that the weight ratio (A: B) of the silane compound represented by the formula (A) and the silane compound represented by the formula (B) is 1: 1 to 15: 1 Coating composition.
The method of claim 1,
The organic solvent (C) is methanol, ethanol, n-propyl alcohol, isopropyl alcohol, n-butyl alcohol, sec-butyl alcohol, t-butyl alcohol, n-hexyl alcohol, n-octyl alcohol, ethylene glycol, diethylene Glycol, triethylene glycol, ethylene glycol monobutyl ether, ethylene glycol monoethyl ether acetate, diethylene glycol monoethyl ether, propylene glycol monomethyl ether, propylene glycol monomethyl ether acetate, diacetone alcohol, methyl cellosolve, ethyl cell Coating composition for building materials, characterized in that at least one selected from the group consisting of rosolve, propyl cellosolve and butyl cellosolve.
The method of claim 1,
The silicone resin (D) coating composition for building materials, characterized in that the viscosity is 20 to 50 cst at 25 ℃.
The method of claim 1,
The (E) curing catalyst is aluminum ethoxide, tantalum ethoxide, germanium ethoxide, titanium ethoxide, zirconium ethoxide, zirconium propoxide, titanium propoxide, aluminum isopropoxide , Germanium isopropoxide, titanium isopropoxide, zirconium isopropoxide, aluminum tributoxide, tantalum butoxide, aluminum t-butoxide, titanium butoxide, titanium t-butoxide, zirconium butoxide and zirconium Coating composition for building materials, characterized in that at least one selected from the group consisting of t-butoxide.
The method of claim 1,
The coating composition is a coating composition for building materials, characterized in that it further comprises 0.1 to 5% by weight of the total composition (F) hydroxyl-containing polysiloxane represented by the following formula (4).
[Formula 4]

(In Formula 4, R ₁ and R ₃ are each independently a single bond or a hydrocarbon group of 1 to 25 carbon atoms, R ₂ are each independently an alkyl group, a cycloalkyl group or a phenyl group, a is an integer of 10 or more, b, c are each independently an integer of 0 to 3, and the sum of b and c is 1 or more.)
(A) 10 to 40% by weight of the silane compound represented by Formula 1, (B) 0.1 to 5% by weight of silane compound represented by Formula 2; And (C) reacting the organic solvent by mixing 25 to 60 wt%;
(C) adding 0.1 to 30% by weight of the silicone resin represented by the following Chemical Formula 3 to the solution containing the organic solvent; And
(E) A method for preparing a coating composition for building materials, comprising adding 0.1 to 5 wt% of a curing catalyst.
[Formula 1]
R ¹ Si (OR ² ) ₃
(In Formula 1, R ¹ And Each R ² is independently selected from an alkyl group of C1-C6, an alkenyl group of C2-C6, a halogenated alkyl group of C1-C6 and an allyl group of C2-C6)
[Formula 2]
R ³ Si (OR ⁴ ) ₃
(In Formula 2, R ³ is an alkyl group of C7-C20 or an aryl group of C6-C20, R ⁴ is C1-C6 alkyl group, C2-C6 alkenyl group, C1-C6 halogenated alkyl group and C2-C6 allyl group)
[Formula 3]

(In Formula 3, each R is independently C1-10 Alkyl, or C6-10 aryl, R 'is C1-10 Alkyl, n is an integer of 1 to 200,000)
The method of claim 7, wherein
The manufacturing method of the coating composition further comprises the step of adding a (F) hydroxyl group-containing polysiloxane represented by the formula (4).
[Formula 4]

(In Formula 4, R ₁ and R ₃ are each independently a single bond or a hydrocarbon group of 1 to 25 carbon atoms, R ₂ are each independently an alkyl group, a cycloalkyl group or a phenyl group, a is an integer of 10 or more, b, c are each independently an integer of 0 to 3, and the sum of b and c is 1 or more.)