KR20200052609A - Coating Composition for Multi-purposes and Method of Preparing Same - Google Patents

Abstract

The multi-purpose coating composition of the present invention is added by adding a small amount of a silane coupling agent prepared by adding acetic acid to 100 to 270 parts by weight of a silane compound to a reaction solution reacted by adding 20 to 100 parts by weight of silica sol to 100 parts by weight of an acrylic emulsion aqueous solution. And reacted to prepare. Isopropyl alcohol (IPA) is added to the prepared multi-purpose coating composition in a weight ratio of 10 to 20% by weight to prepare a multi-purpose coating composition having storage stability of about 30 to 60 days.

Description

Coating composition for multi-purposes and method of preparing same

The present invention protects the outer wall by coating on a concrete wall surface such as a building interior and exterior wall, a parking lot floor, a warehouse floor, a fence, a tunnel interior wall, a wall, or a synthetic resin wall such as plastic, or protecting a vehicle, a bridge, an offshore structure, various plants, It relates to a multi-purpose coating composition for long-term protection from corrosive environments by coating on steel structures in severely corrosive environments such as containers and ships. More specifically, the present invention relates to a multipurpose coating composition such as antifouling, flame retardancy, waterproofness, scratch resistance (scratch resistance), weatherability, etc. by coating a concrete or synthetic resin wall or iron structure to form a coating film. .

Various coating compositions, including paint, are applied to the inner and outer walls of the building, the parking lot floor, the warehouse floor, the fence, the tunnel inner wall, the wall, the concrete wall, and the synthetic resin wall to form a coating film. The reason for forming the coating film on them is to prevent contamination, including for aesthetic reasons, to easily remove them when they are contaminated or graffitied with graffiti, or to impart water resistance to the walls of buildings that require water resistance. It is for. In addition, scratch resistance and abrasion resistance should be good in places such as the bottom of the runner window.

In particular, various problems in the aesthetics of the city are caused by graffiti on various wall surfaces of the city. Graffiti has a positive effect in some areas, but most of it is the city's beast, spoiling the city's aesthetics. Removing the graffiti that harms the aesthetics of the city is costly and effort consuming. It is even more difficult for graffiti that is not easily erased. Therefore, it is necessary to develop a coating composition capable of forming a coating film that can be easily erased.

The coating film for this purpose must also have a high hardness to prevent damage due to scratches. When the coating film is exposed to sunlight, it must have strong resistance to ultraviolet rays. In some cases, the coating film, such as the floor surface of a warehouse and the floor surface of a parking lot, needs to be waterproof, and in the case of a combustible material such as a building exterior wall or fence, it must have flame retardancy or non-combustibility. For these various purposes, many paint compositions have been developed and used.

The present inventor's Patent No. 1221289 is a main solution comprising 100 parts by weight of water-soluble epoxy resin, 50 to 300 parts by weight of water glass and 10 to 150 parts by weight of water; And a water-soluble curing agent 100 parts by weight of water and a curing agent solution containing 10 to 300 parts by weight of water is disclosed to prevent contamination coating. In addition, the inventor's patent No. 13,339 includes 100 parts by weight of a silane compound and 1 to 300 parts by weight of an acidic solution having a pH of 3 or less, and after mixing the silane compound and an acidic solution, it is heated to a temperature of 80 to 110 ° C. Disclosed is a coating additive for preventing contamination and a coating composition comprising the same.

The present inventor is an acidic silane mixture (A) prepared by mixing 100 parts by weight of methyl trimethoxysilane (CH ₃ -Si- (OCH ₃ ) ₃ ), 15 to 60 parts by weight of water, and 0.5 to 3.0 parts by weight of acetic acid, And aminoethylaminopropyltrimethoxysilane (H ₂ NC ₂ H ₄ HNC ₃ H ₆ -Si- (OCH ₃ ) ₃ ) alkaline silane mixture (B) prepared by mixing 100 parts by weight and 30 to 3,000 parts by weight of water Developed a silane-based coating composition for preventing contamination, and applied for patent application No. 2017-115048 (filed on Sep. 08, 2017)

The silane-based coating composition for preventing pollution of the patent application No. 2017-115048 has excellent pollution prevention, high surface hardness, strong UV resistance, flame retardancy and waterproofness, and low manufacturing cost. However, it has been found that the silane-based coating composition prepared by mixing the acidic silane mixture (A) and the alkaline silane mixture (B) undergoes gelation, resulting in poor storage. In other words, the silane-based coating composition undergoes gelation in 1 to 2 weeks and changes to a state that cannot be applied to the wall surface. In other words, because of poor storage, the shelf life is shortened, so mass production is also impossible, and there are disadvantages that must be used before gelation proceeds.

In order to solve the above deficiencies of the silane-based coating composition for preventing pollution of patent application No. 2017-115048, the present inventor developed a new silane-based coating composition for preventing pollution and applied for it as patent application No. 2017-132977. However, the coating composition of patent application No. 2017-132977 also has a problem that the dispersion of the silane compound and the pigment is not uniform.

The present inventor is a multi-purpose coating composition of the present invention is made of a silane composition (A), water (B), and a curing agent aqueous solution (C) to solve the above problems, the silane composition (A) is 100 parts by weight A composition prepared by mixing 0.3 to 3.0 parts by weight of acetic acid and a small amount of an additive in a silane compound was developed and applied for patent application No. 2018-20693. However, this composition revealed a defect that cracks occurred with time.

The multi-purpose coating composition of the present invention is also used for long-term protection from corrosive environments by coating steel structures in severe corrosive environments such as automobiles, bridges, offshore structures, various plants, containers, ships, and the like. Patent 1054600 discloses a heavy duty ceramic coating composition for this purpose. The heavy-duty ceramic coating composition is a coating composition in which a first reaction solution composed of dimethyltrimethoxy silane, vinyl silane, isopropyl alcohol, and hydroxypropyl cellulose is mixed with a second reaction solution composed of distilled water and silica sol.

In addition, Patent No. 1347725 discloses a hybrid modified silicate binder composition that improves water resistance and durability by adding a silane coupling agent and methyl trimethoxy silane (MTMS) to an aqueous alkali metal silicate solution.

The present inventors are coated on a concrete or synthetic resin wall or iron structure, including a conventional heavy-duty ceramic paint composition or a hybrid modified silicate binder composition, to prevent contamination (antifouling), flame retardancy, waterproofness, scratch resistance (scratch resistance), weather resistance, cracking It is possible to form a coating film excellent in all physical properties such as prevention and to develop a multi-purpose coating composition of the present invention having excellent storage stability and a method for manufacturing the same.

An object of the present invention is to provide a new coating composition excellent in contamination prevention as a coating composition to form a coating film by applying to a building interior and exterior walls, parking lot floors, warehouse floors, fences, walls, concrete walls, synthetic resin walls, and the like.

Another object of the present invention is to provide a multi-purpose coating composition for long-term protection from corrosive environments by coating steel structures in severe corrosive environments such as automobiles, bridges, offshore structures, various plants, containers, ships, and the like.

Another object of the present invention is to provide a coating composition excellent in water resistance.

Another object of the present invention is to provide a coating composition having good water permeability by forming a coating film made of a ceramic component, although water particles do not pass due to excellent water resistance.

Another object of the present invention is to provide an environmentally friendly coating composition that does not have mold on the wall due to excellent breathability.

Another object of the present invention is to provide a coating composition having excellent surface hardness and excellent scratch resistance.

Another object of the present invention is to provide a coating composition resistant to ultraviolet rays.

Another object of the present invention is to provide a coating composition having excellent incombustibility by forming a coating film made of a ceramic component.

Another object of the present invention is to provide a coating composition that does not cause cracking of the coating film even after a long time.

Another object of the present invention is to provide a novel coating composition that has good storage and is not restricted by the shelf life.

The above and other objects of the present invention can be achieved by the present invention described in detail below.

The multi-purpose coating composition of the present invention is prepared by reacting by adding a small amount of 100 to 270 parts by weight of a silane compound in which acetic acid is added to a solution reacted by adding 20 to 100 parts by weight of silica sol to 100 parts by weight of an acrylic emulsion aqueous solution. To the prepared multi-purpose coating composition, 10 to 20% by weight of isopropyl alcohol (IPA) is added to prepare a multi-purpose coating composition having a storage stability of about 45 to 60 days.

The acrylic emulsion aqueous solution may be preferably used having a solid content of 30 to 50%.

The silica sol may preferably be used having a solid content of 30 to 40%.

20-100 parts by weight of silica sol is added to 100 parts by weight of the aqueous acrylic emulsion solution, and reacted while stirring at room temperature for 1 hour.

0.5 to 1.5 parts by weight of acetic acid is added to 100 to 270 parts by weight of the silane compound, and the silane compound is reacted with stirring while adding a small amount to the reaction solution of the aqueous acrylic emulsion solution and silica sol for 2 hours.

In the process of reacting the silane compound with an acrylic emulsion aqueous solution and a reaction solution of silica sol, an additive may be further added as necessary. Additives used are pigments for realizing the required color, and fillers for controlling the thickness of the coating film. Pigments include white pigments such as TiO ₂ , iron oxide pigments, cadmium yellow pigments, carbon black, chrome yellow pigments, and ceramic pigments. Fillers include CaCO ₃ and talc.

Hereinafter will be described in detail below the specific contents of the present invention.

The present invention is a multi-purpose coating composition that can be coated on a concrete or synthetic resin wall or steel structure to prevent contamination, has excellent surface hardness, is excellent in ultraviolet rays, has flame retardancy and waterproofness, and can prevent corrosion. It has the effect of the invention to provide excellent new coating compositions and methods for their preparation.

The present invention relates to a multi-purpose coating composition for protecting an outer wall by coating on a concrete or synthetic resin wall surface or protecting a steel structure in a corrosive environment for a long period of time from a corrosive environment. It relates to a multi-purpose coating composition, such as antifouling, flame retardant, waterproof, scratch resistance (scratch resistance), weather resistance by forming a.

The multi-purpose coating composition of the present invention is prepared as follows.

20-100 parts by weight of silica sol is added to 100 parts by weight of an acrylic emulsion aqueous solution, and reacted with stirring at room temperature for 1 hour to prepare a reaction solution.

The acrylic emulsion aqueous solution may be preferably used having a solid content of 30 to 50%.

The silica sol may preferably be used having a solid content of 30 to 40%. Silica sol refers to colloidal silica in which silica or silicon dioxide (SiO ₂ ) is present in a colloidal state. Colloidal silica is an amorphous spherical silica that exists in the liquid phase and can be made from alkali silicate.

The coating composition of the present invention is prepared by adding a small amount of 100 to 270 parts by weight of a silane compound in which acetic acid is added to the reaction solution of the prepared acrylic emulsion aqueous solution and silica sol.

The silane compound used in the present invention is methyltrimethoxy silane (MTMS). Reactive silane compounds containing an amino group, an epoxy group, a urethane group, or an isocyanate group are excluded from the silane compounds of the present invention. Since the reactive silane compound is weak to ultraviolet rays and does not have sufficient flame retardancy, it is not suitable for coating compositions for protecting the outer wall by coating on a concrete or synthetic resin wall surface, or coating a steel structure in a corrosive environment for a long period of time from a corrosive environment.

The silane compound reacts with the acrylic component to prevent cracking of the coating film. In the case of coating on a concrete or synthetic resin wall surface or a steel structure in a corrosive environment, the coating composition is usually applied repeatedly 2-3 times. To 100 to 270 parts by weight of the silane compound, 0.5 to 1.5 parts by weight of acetic acid is added.

While adding 100-100 parts by weight of silica sol to 100 parts by weight of the acrylic emulsion aqueous solution, while adding 0.5-1.5 parts by weight of acetic acid to the reaction solution reacted while stirring at room temperature for 1 hour, 100-270 parts by weight of silane compound was added in small portions for 2 hours. The reaction was stirred to prepare a coating composition of the present invention.

When the silane compound is used in an amount of 100 parts by weight or less, the surface hardness is weak, contaminants are not removed, and flame retardancy is not excellent. On the other hand, when the silane compound is used in more than 270 parts by weight, the curing time of the coating film becomes longer. For example, when coating a smooth and poorly absorbing coating solution such as metals or synthetic resins, the curing time after the first coating takes about 1 to 3 days. There is a problem in that the working process is lengthened because the curing time has to be waited for the second coating. If the secondary coating is applied after the primary coating is sufficiently cured, the secondary coating cannot be performed because the coating film is excited. Therefore, it is necessary to react 100 to 270 parts by weight of a silane compound added with acetic acid to the reaction solution reacted by adding 20 to 100 parts by weight of silica sol to 100 parts by weight of an acrylic emulsion aqueous solution.

When an aqueous acrylic emulsion solution, a silica sol, and a silane compound are mixed at the same time, they are gelled and cannot be mixed at the same time. Therefore, the reaction solution reacted by adding 20 to 100 parts by weight of silica sol to 100 parts by weight of the acrylic emulsion aqueous solution must first be prepared, and 100 to 270 parts by weight of a silane compound in which acetic acid is added to the reaction solution should be reacted.

In the process of reacting the silane compound with acetic acid added to the reaction solution of the acrylic emulsion aqueous solution and the silica sol, an additive may be further added as necessary. Additives used are pigments for realizing the required color, and fillers for controlling the thickness of the coating film. Pigments include white pigments such as TiO ₂ , iron oxide pigments, cadmium yellow pigments, carbon black, chrome yellow pigments, and ceramic pigments. Fillers include CaCO ₃ and talc.

The prepared multi-purpose coating composition begins to solidify after 5-7 days. When the coating composition is solidified, the coating operation cannot be performed. Therefore, in the present invention, 10 to 20% by weight of isopropyl alcohol (IPA) in a weight ratio to the multi-purpose coating composition prepared above is added to delay the solidification time. The multi-purpose coating composition of the present invention in which 10 to 20% by weight of isopropyl alcohol is added has excellent storage stability, and does not solidify for about 30 to 60 days and maintains a liquid state.

When the content of the silane compound is increased in the multipurpose coating composition of the present invention, the viscosity may be increased. In this case, an appropriate amount of water may be mixed with the coating composition. 10-20% by weight of water can be added to the total coating composition.

The present invention will be embodied by the following examples, and the following examples are only illustrated for illustrative purposes of the present invention and should not be construed as limiting or limiting the protection scope of the present invention.

Example

Example 1

In a 2 L container equipped with a stirrer, add 100 g of an acrylic emulsion aqueous solution (ACC Co., Ltd. product: ACC 1005) having a solid content of 40.6% and stir at 100 rpm at room temperature while stirring a silica sol having a solid content of 40% (product of Youngil Chemical Co., Ltd .: Product name YGS-40) 30 g was added to prepare a reaction solution uniformly stirred for 1 hour. Methyltrimethoxy silane (MTMS) (manufactured by Dow Corning, product name: 6070) 150 g of acetic acid 0.5 g of silane coupling agent is added in small portions, and the mixture is uniformly stirred for 2 hours to react for multi-purpose coating composition of the present invention 280 g was prepared. Table 1 shows the composition of each component.

Example 2

The composition of each component was as shown in Table 1, and was carried out in the same manner as in Example 1, except that 40 g of talc was used as the filler.

Example 3

The composition of each component was as shown in Table 1, and it was carried out in the same manner as in Example 1, except that 5.0 g of titanium dioxide as a pigment and 20 g of talc as a filler were used.

Example 4

The composition of each component is as shown in Table 1, 10.0 g of titanium dioxide as a pigment, 20 g of talc as a filler, and except that 20 g of isopropyl alcohol was used in the above-mentioned multi-purpose coating composition, Example 1 and It was carried out in the same way.

Example 5

The composition of each component is as shown in Table 1, 5.0 g of titanium dioxide as a pigment, 20 g of talc as a filler, and 30 g of isopropyl alcohol was used in the prepared multi-purpose coating composition. It was carried out in the same way.

Example 6

The composition of each component is as shown in Table 1, 10.0 g of titanium dioxide as a pigment, 20 g of talc as a filler, and 40 g of isopropyl alcohol is used in the prepared multi-purpose coating composition. It was carried out in the same way.

Comparative Example 1-3

The composition of each component was carried out in the same manner as in Example 1 as shown in Table 1.

                                                               (Unit: parts by weight) Example Comparative example One 2 3 4 5 6 One 2 3 Reaction solution Acrylic emulsion aqueous solution 100
100
100
100
100
100
100
100
100
Silica sol 30 30 30 100 20 40 70 10 50 Silane
Coupling agent MTMS 150 150 150 100 120 270 300 80 50 Acetic acid 1.0 1.0 1.0 0.6 0.7 0.7 0.5 0.3 0.8 Pigment - - 5.0 10.0 5.0 10.0 - 5.0 10.0 filling - 20 20 20 20 20 - 20 20 Storage stabilizer isopropyl alcohol 30 30 30 90 40 40 - - -

Physical property test : The coating composition obtained in Examples 1-6 and Comparative Examples 1-3 was first applied uniformly in an amount of 0.1 kg / m 2 to a cement board having a size of 20 cm x 20 cm, and secondly applied after 1 day, The specimen was prepared by curing at room temperature for 7 days. Pencil hardness, moisture resistance, cracking and storage stability were measured or observed for the specimen.

Pencil hardness was measured according to KS M ISO 15184: 2002, moisture resistance was measured according to KS D 8502: 2004, cracking was observed for 90 days, and the start date of solidification showing storage stability was observed with the naked eye. Table 2 shows the test results.

As a result of the test, both the pencil hardness and moisture resistance were found to be good, and cracks did not occur even after 90 days after the second application, and Examples 1-6 in which isopropyl alcohol was mixed with the multipurpose coating composition of the present invention was at least 45. It did not appear to solidify for up to 56 days or more.

Test Methods Example Comparative example One 2 3 4 5 6 One 2 3 Pencil hardness KS M ISO 15184: 2002 4H 4H 4H 5H 3H 4H 6H 1H 2H Moisture resistance KS D 8502: 2004 normal normal normal normal normal normal normal normal normal Cracking Visual observation none none none none none none none none none Storage stability
(Start date of gelation) Visual observation 60 55 50 45 60 47 7 10 8

Simple modifications or changes of the present invention can be easily carried out by those skilled in the art, and all such modifications or changes can be considered to be included in the scope of the present invention.

Claims (9)

A reaction solution obtained by adding 20 to 100 parts by weight of silica sol to 100 parts by weight of an acrylic emulsion aqueous solution; And
100 to 270 parts by weight of a silane compound added with 0.5 to 1.5 parts by weight of acetic acid;
Including,
Multi-purpose coating composition characterized in that it is prepared by reacting while adding a small amount of the silane compound to the reaction solution.
The multipurpose coating composition according to claim 1, wherein the aqueous acrylic emulsion solution has a solid content of 30 to 50%, and the silica sol has a solid content of 30 to 40%.
The multi-purpose coating composition according to claim 1, wherein the silane compound is methyl trimethoxy silane (MTMS).
The multipurpose coating composition according to any one of claims 1 to 3, further comprising a pigment for realizing a color required as an additive, a filler for adjusting the thickness of the coating film, or a mixture thereof. .
The multipurpose coating composition according to claim 4, further comprising 10 to 20% by weight of isopropyl alcohol (IPA) in a weight ratio with respect to the multipurpose coating composition.
The multipurpose coating composition according to claim 5, further comprising 10 to 20% by weight of water in a weight ratio with respect to the multipurpose coating composition.
20 to 100 parts by weight of silica sol was added to 100 parts by weight of an acrylic emulsion aqueous solution to prepare a reaction solution reacted with stirring at room temperature for 1 hour;
A silane coupling agent is prepared by adding 0.5 to 1.5 parts by weight of acetic acid to 100 to 270 parts by weight of a silane compound; And
Reacting the reaction solution while adding the silane coupling agent in small portions for 2 hours;
Method of producing a multi-purpose coating composition comprising a step.
The method of claim 7, further comprising mixing 10 to 20% by weight of isopropyl alcohol (IPA) in a weight ratio with respect to the multipurpose coating composition.
The method according to claim 7 or 9, further comprising mixing 10 to 20% by weight of water in a weight ratio with respect to the multipurpose coating composition.