KR101797975B1 - Waterproofing paint composition having high elasticity and high adhesion, manufacturing method of the same, and the painting method using the same - Google Patents

Abstract

The present invention relates to a high elasticity and high adhesion waterproof paint composition using ceramic powder and acrylic synthetic resin and not requiring base coating pretreatment, a manufacturing method thereof, and a construction method using the same. More specifically, according to the present invention, the composition includes: 30-40 parts by weight of acrylic synthetic resin; 15-20 parts by weight of water; 3-8 parts by weight of color paint; 20-30 parts by weight of extender; 10-20 parts by weight of ceramic powder; 0.5-10 parts by weight of film former; 0.2-0.3 parts by weight of mold preventer; 0.1-0.3 parts by weight of preservative; 0.1-0.5 parts by weight of disperser; 0.5-0.7 parts by weight of antifreeze; 10-15 parts by weight of humectant; 10-15 parts by weight of antifoaming agent; and 5-15 parts by weight of thickener. The acrylic synthetic resin is mixed at a ratio of 50:50-60 with vinyl acetate powder resin and MMA composite resin manufactured by emulsifying and polymerizing methyl methacrylate (MMA) monomer, 2-ethylhexyl acrylate (2-EHA), and acrylic acid (AA) at 60-80C. The ceramic powder is alkaline silicate powder.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water-repellent, high-elasticity, high-adhesion water-repellent coating composition using a ceramic powder and an acrylic resin mixture, PAINTING METHOD USING THE SAME}

The present invention relates to a high elasticity and high adhesion waterproof coating composition using a ceramic powder and an acrylic mixed resin and does not require a pretreatment, a method of manufacturing the same, and a method of using the same.

Buildings or structures in areas with distinct four seasons and high temperature changes endure the high temperatures of 50 ~ 60 ℃ in summer and subzero temperatures in winter, and the inherent physical properties are weakened due to repeated expansion and contraction. Cracks and cracks can occur, which can lead to long-term structural damage to buildings or structures along with leakage. Therefore, it is necessary to form the waterproof coating film so as to maintain effective waterproof performance even in severe cold and cold weather.

Typically, the waterproof coating is a formulation for applying a waterproofing agent in the form of an aqueous or oily liquid to a surface of the substrate and drying the water or solvent to form a waterproof coating. The emulsion waterproof coating is also referred to as an emulsion resin type waterproof coating, Is a waterproof paint that forms a waterproof layer by overlaying the surface.

Such a water-dispersible acrylic emulsion resin paint is advantageous in that it is environmentally friendly because it has less cracks due to self-shrinkage when it is cured and does not use an organic solvent. However, it is known that it is difficult to apply in a place where the material is soft and the area is large. Specifically, the acrylic emulsion waterproofing paint satisfies the basic waterproofing performance but has disadvantages such as chemical resistance, stain resistance, weather resistance, durability, elasticity and tensile strength.

On the other hand, architectural waterproofing paints are oil-based acrylic, oil-based alkyds and oil-based urethane products as finishing finishes, but their applications and coating systems are limited. It is necessary to develop coating materials which can be applied when finishing the top coat of architectural coatings by applying top coat finishes applicable to various substrates and in particular to be able to apply coatings without restricting the types of old films and substrates during maintenance. Particularly, the oil-based acrylic, acrylic emulsion, and oil-based urethane which are conventionally used paint type have poor adhesion with a smooth inorganic substance and their use is restricted to such as a tile.

In order to solve such a problem, attempts have been made to improve adhesion by using a silane monomer which improves adhesion to an inorganic material constituting a tile or the like, and then synthesizing the resin and using it as a binder. For example, Korean Patent Laid-Open Publication No. 2003-0043072 discloses a method for producing a polyimide resin composition, which comprises reacting diacetone acrylamide, anhydrous adipic acid, N- (2-methacryloyloxyethyl) -ethyleneurea, And applying an acrylic emulsion using triethoxyvinylsilane to improve the adhesion with inorganic substances. However, since diacetone acrylamide and anhydrous adipic acid, which are used as the above-mentioned binders, are used only in a water-based environment, they have a disadvantage in terms of raw material cost because they are inferior in physical properties such as gloss, water resistance and appearance, .

In addition, it is important to give flexible elasticity and excellent adhesion to the surface when forming a waterproof coating, and to prevent the coating film from being cracked or damaged due to impact, shrinkage and expansion of the building due to continuous waterproofing It is required to have a sufficient high elasticity sufficient for the following reason.

Korean Patent Publication No. 2003-0043072

Therefore, in the present invention, a highly elastic and highly adhesive waterproof coating composition which does not require any pretreatment on the base and has high adhesion and which has high elasticity and which uses ceramic powder and acrylic mixed resin and does not require pretreatment And to provide them.

Another object of the present invention is to provide a method for manufacturing a highly elastic and highly adhesive waterproof coating composition using the ceramic powder and an acrylic mixed resin and without requiring a pretreatment.

Another object of the present invention is to provide a method of applying a highly elastic and highly adhesive waterproof coating composition using a ceramic powder and an acrylic mixed resin without requiring a pre-treatment.

According to an aspect of the present invention,

30 to 40 parts by weight of an acrylic mixed resin, 15 to 20 parts by weight of water, 3 to 8 parts by weight of a color pigment, 20 to 30 parts by weight of an extender pigment, 10 to 20 parts by weight of a ceramic powder, 0.5 to 10 parts by weight of a film forming agent, 0.1 to 0.3 parts by weight of a preservative, 0.1 to 0.5 parts by weight of a dispersant, 0.5 to 0.7 parts by weight of a cryoprotectant, 10 to 15 parts by weight of a wetting agent, 10 to 15 parts by weight of a defoaming agent and 5 to 15 parts by weight of a thickener and,

The acrylic mixed resin is obtained by mixing an MMA mixed resin prepared by emulsion polymerization of methyl methacrylate (MMA) monomer, 2-ethylhexyl acrylate (2-EHA) and acrylic acid (AA) at 60 to 80 ° C, The powdery resin is mixed in a ratio of 50:50 to 60,

Characterized in that the ceramic powder is an alkali silicate powder,

The present invention provides a highly elastic, highly adhesive waterproof coating composition which does not require undercoat pretreatment using a ceramic powder and an acryl mixed resin.

In the present invention, the MMA mixed resin may contain,

(i) mixing a surfactant with ion-exchanged water and raising the temperature thereof with stirring to prepare a first mixture; (ii) an acrylic monomer mixture pre-emulsion comprising a methyl methacrylate (MMA) monomer, a 2-ethylhexyl acrylate (2-EHA) monomer, an acrylic acid (AA), a surfactant and ion- To produce a second mixture; (iii) aging the second mixture to prepare a third mixture by adjusting the pH thereof, and (iv) adding a crosslinking polymer to the third mixture to adjust the physical properties of the mixture. Acrylic resin,

The vinyl acetate based powder resin may be selected from the group consisting of vinyl acetate / ethylene copolymer, vinyl acetate / acrylate copolymer, vinyl acetate / vinyl ester copolymer, vinyl acetate / vinyl versatate copolymer, vinyl acetate / vinyl ester / Ethylene terpolymer, a vinyl acetate / vinyl laurate / vinyl versatate ternary interpolymer, and a vinyl acetate / vinyl versatate / acrylic ester ternary interpolymer.

In order to solve the above-mentioned other problems,

(a) 15 to 20 parts by weight of water, 0.2 to 0.3 parts by weight of a mold inhibitor, 0.1 to 0.3 parts by weight of a preservative, 0.1 to 0.5 parts by weight of a dispersant, 0.5 to 0.7 parts by weight of a cryoprotectant, 10 to 15 parts by weight of a wetting agent, And 15 parts by weight of a polyvinyl alcohol are sequentially added and mixed while stirring at 600 to 800 rpm to produce a mixture;

(b) 3 to 8 parts by weight of a color pigment, 20 to 30 parts by weight of an extender pigment, and 10 to 20 parts by weight of a ceramic powder are added to the mixture after the step (a) Followed by high-speed stirring at 1000 to 1200 rpm;

(c) stirring the mixture obtained through the step (b) at 1000 to 2000 rpm while adding 30 to 40 parts by weight of an acrylic mixed resin and 0.5 to 10 parts by weight of a film forming agent for at least 1 hour; And

(d) stirring at 1000 to 2000 rpm while adding 5 to 15 parts by weight of a thickener to the mixture after the step (c) for at least 30 minutes,

The acrylic mixed resin is obtained by mixing an MMA mixed resin prepared by emulsion polymerization of methyl methacrylate (MMA) monomer, 2-ethylhexyl acrylate (2-EHA) and acrylic acid (AA) at 60 to 80 ° C, The powdery resin is mixed in a ratio of 50:50 to 60,

Characterized in that the ceramic powder is an alkali silicate powder,

The present invention provides a method for producing a highly elastic and highly adhesive waterproof coating composition which does not require undercoat pretreatment using a ceramic powder and an acrylic mixed resin.

Further, in the present invention,

(i) mixing a surfactant with ion-exchanged water and raising the temperature thereof with stirring to prepare a first mixture; (ii) an acrylic monomer mixture pre-emulsion comprising a methyl methacrylate (MMA) monomer, a 2-ethylhexyl acrylate (2-EHA) monomer, an acrylic acid (AA), a surfactant and ion- To produce a second mixture; (iii) aging the second mixture to prepare a third mixture by adjusting the pH thereof, and (iv) adding a crosslinking polymer to the third mixture to adjust the physical properties of the mixture. Acrylic resin,

The vinyl acetate based powder resin may be selected from the group consisting of vinyl acetate / ethylene copolymer, vinyl acetate / acrylate copolymer, vinyl acetate / vinyl ester copolymer, vinyl acetate / vinyl versatate copolymer, vinyl acetate / vinyl ester / Ethylene terpolymer, a vinyl acetate / vinyl laurate / vinyl versatate ternary interpolymer, and a vinyl acetate / vinyl versatate / acrylic ester ternary interpolymer.

According to another aspect of the present invention,

A pretreatment step of removing foreign matters adhered to the substrate; And

A method of applying a high elasticity and high adhesion waterproof coating composition to a pretreated substrate by applying the above-mentioned high elasticity and high adhesion waterproof coating composition to a surface of the pretreated substrate using a ceramic powder and an acrylic mixed resin .

Since the waterproof coating composition according to the present invention includes a ceramic powder and an acrylic mixed resin, and particularly an acrylic mixed resin obtained by mixing a network-like MMA mixed resin and a vinyl acetate powder resin, the adhesion and elasticity of the water- Water resistance and water repellency, water repellency, chemical resistance, weather resistance, egg yolk denaturation, surface gloss, non-flammability and flame retardancy, and further includes ceramic powder, The elasticity can be imparted while improving the ease of installation.

Further, the highly elastic and highly adhesive waterproof coating composition using the ceramic powder and acrylic mixed resin according to the present invention, which does not require pretreatment of the undercoat layer, can be applied quickly and easily because it is one-component type and the waterproof coating composition has high adhesion Therefore, it has excellent adhesion to the base surface, has excellent elasticity which stretches like rubber, and has excellent waterproof property and concealability, so that it can be directly applied on the pretreated base surface without separate treatment. There is an effect that the convenience of construction is remarkably improved.

In addition, even if a fine crack is generated due to factors such as climate or temperature change on the surface after the application, the coating film is not damaged at all, and the cracks can be prevented from being protected to expand the cracks. At the same time, It is possible to block the various harmful components of the building structure flowing out from the cracked portion.

1 shows the results of a test example according to an embodiment of the present invention.
2 shows a quality inspection report of a coating composition according to an embodiment of the present invention.

Hereinafter, the present invention will be described in detail.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. It will be further understood that the terms " comprises ", or "having ", and the like in the specification are intended to specify the presence of stated features, integers, But do not preclude the presence or addition of steps, operations, elements, parts, or combinations thereof.

The present invention relates to a highly elastic and highly adhesive waterproof coating composition which does not require undercoat pretreatment using a ceramic powder and an acrylic mixed resin, and is characterized by comprising 30 to 40 parts by weight of an acrylic mixed resin, 15 to 20 parts by weight of water, 0.1 to 0.3 parts by weight of an antiseptic agent, 0.1 to 0.5 parts by weight of a dispersant, 0.1 to 5 parts by weight of a dispersing agent, 10 to 20 parts by weight of an extender pigment, 10 to 20 parts by weight of an extender pigment, 0.5 to 0.7 parts by weight of a cryoprotectant, 10 to 15 parts by weight of a wetting agent, 10 to 15 parts by weight of a defoaming agent and 5 to 15 parts by weight of a thickener.

The high elasticity and high adhesion waterproof coating composition of the present invention is prepared by mixing and mixing water, antifungal agent, preservative, dispersant, cryoprotectant, humectant and antifoaming agent in sequence and sequentially adding a color pigment, extender pigment and ceramic powder After mixing and mixing, an acrylic mixed resin and a film forming agent are added and mixed. Then, the viscosity of the mixture is adjusted while adding a thickening agent to form a waterproof coating composition of the present invention.

The paint composition according to the present invention is particularly resistant to acid and / or base by using an acrylic mixed resin, and provides surface gloss and provides weather resistance to prevent discoloration due to ultraviolet rays or structural aging. At this time, in the present invention, as the acrylic mixed resin, the acrylic resin and the powder resin of a network structure are included so that the adhesive force capable of easily adhering the coating composition to the surface to be formed can be remarkably improved .

Specifically, the acrylic mixed resin is obtained by mixing an MMA mixed resin prepared by emulsion polymerization of methyl methacrylate (MMA) monomer, 2-ethylhexyl acrylate (2-EHA) and acrylic acid (AA) at 60 to 80 ° C, Acetate powder resin is mixed in a ratio of 50:50 to 60.

More specifically, the MMA mixed resin is a network-structured acrylic resin, comprising the steps of: (i) mixing a surfactant with ion-exchange water and raising the temperature while stirring to prepare a first mixture; (ii) an acrylic monomer mixture pre-emulsion comprising a methyl methacrylate (MMA) monomer, a 2-ethylhexyl acrylate (2-EHA) monomer, an acrylic acid (AA), a surfactant and ion- To produce a second mixture; (iii) aging the second mixture and adjusting the pH to prepare a third mixture, and (iv) adding a crosslinking polymer to the third mixture to adjust the physical properties.

In the step (i), 0.2 to 1.0 wt% of the surfactant is mixed with 99.0 to 99.8 wt% of ion-exchanged water, and the mixture is heated to 75 to 85 캜 with stirring at 80 to 130 RPM. At this time, it is preferable to use at least one surfactant selected from the group consisting of sodium dodecylbenzene sulfonate, sodium dodecylbenzene sulfonate, nonionic ether sulfate and dialkylsulfonic acid ester.

The step (ii) further comprises adding 0.2 to 0.3% by weight of an initiator which is a mixture of one or more selected from the group consisting of ammonium persulfate, sodium persulfate, and potassium persulfate to the mixture heated to 80 to 85 ° C in step (i) 99.7 to 99.8% by weight of an acrylic monomer mixture pre-emulsion composed of methyl methacrylate (MMA) monomer, 2-ethylhexyl acrylate (2-EHA) monomer, acrylic acid (AA), surfactant and ion- do.

At this time, when the acrylic monomer mixture pre-emulsion is added all at once, there arises a problem of gelation due to a sudden reaction of a large number of monomers. Accordingly, 5 to 10% by weight of the acrylic monomer mixture pre-emulsion to be added to the mixture is preliminarily added in an amount of 5 to 10% by weight based on 100 parts by weight of the pre-emulsion, and then the first reaction is carried out for 5 to 20 minutes. It is important to react.

In this case, the methyl methacrylate (MMA) monomer and the 2-ethylhexyl acrylate (2-EHA) monomer are preferably 60 to 90 parts by weight based on 100 parts by weight of the acrylic monomer mixture pre-emulsion. Preferably, the methyl methacrylate (MMA) monomer and the 2-ethylhexyl acrylate (2-EHA) monomer are contained in a weight ratio of 4 to 6: 6 to 7, and the acrylic acid monomer is contained in the acrylic monomer mixture free 0.5 to 3.0 parts by weight based on 100 parts by weight of the total emulsion.

The surfactant may be any of the surfactants described above, and may be used in an amount of 0.5 to 3.0 parts by weight based on 100 parts by weight of the acrylic monomer mixture pre-emulsion.

The step (iii) is followed by aging the mixture of step (ii) at 65 to 75 ° C for 60 to 120 minutes, and then adjusting the pH of the aged mixture to 7 to 10. That is, the process of aging the mixture of step (ii) may further assist the removal of the unreacted residual monomers, so that the addition of the initiator after the addition of the initiator may help to remove the residual monomer, Suitable for removal. Since the aged mixture is acidic with a pH of 2 to 6, it is preferable to adjust the pH to 7 to 10 to suit the storage stability of the mixture.

Finally, in step (iv), the crosslinked polymer is added in an amount of from 0.5 to 3.0% by weight to 97 to 99.5% by weight of the mixture of step (iii), and then the mixture is stirred for 30 to 60 minutes to prepare a network-structured acrylic emulsion resin do.

If the content of the cross-linking polymer exceeds 3.0% by weight, the property of the physical property may not be improved or may be decreased. Therefore, it is preferable to add 0.5 to 3.0% by weight based on 100% by weight of the mixture. The crosslinked polymer may be one or a mixture of two or more selected from the group consisting of phenol formaldehyde, epoxy, unsaturated polyester, melamine, amide and urea.

The acrylic mixed resin is a resin obtained by mixing the MMA mixed resin and the vinyl acetate powder resin, and the powder resin plays a role of complementing the binder at the time of filling the gap between the particles and forming the film. That is, it improves the adhesiveness of the coating material and improves the workability, the flexibility and the plasticity of the coating film. In particular, because of the plasticity inherent in a polymer material, plasticity that can not be represented by a ceramic component is imparted, thereby enhancing bending strength. Such a vinyl acetate powder resin may be a vinyl acetate / ethylene copolymer, a vinyl acetate / acrylate copolymer, a vinyl acetate / vinyl ester copolymer, a vinyl acetate / vinyl versatate copolymer, a vinyl acetate / vinyl ester / Ethylene terpolymer, vinyl acetate / vinyl laurate / vinyl versatate ternary interpolymer, and vinyl acetate / vinyl versatate / acrylic ester ternary interpolymer may be used. In this case, in the acrylic mixed resin, it is important that the MMA mixed resin and the vinyl acetate powder resin are mixed in a ratio of 50:50 to 60. When the content of the vinyl acetate-based powder resin is less than the above range, there is a problem that the elasticity is lowered to cause cracking of the coating film and deterioration of the adhesion. When the content exceeds the above range, cracks of the coating film and the surface of the coating film are not smooth, There is a problem that elasticity and adhesiveness are rather deteriorated. Therefore, it is important to mix in the above-mentioned range in order to maximize the adherence effect by the MMA mixed resin of the network structure while improving the adhesion by the vinyl acetate-based powder resin, improving the flexibility and the plasticity of the coating film.

In addition, in the present invention, the water makes it possible to construct an aqueous coating composition as a solvent for dissolving the constituent components of the waterproof coating composition of the present invention, thereby making it environmentally friendly. Accordingly, the waterproof paint composition according to the present invention can be applied to the exterior of a steel structure such as a bridge, an overpass, a steel tower, etc., which is outside of the building or a building requiring repair, or other waterproof function.

In the present invention, titanium oxide is used as the coloring pigment. Other than this, an inorganic pigment such as iron oxide or iron hydroxide representing reddish brown or chromium oxide representing green may be used.

In the present invention, the extender pigment may be at least one selected from the group consisting of talc, mica, silica, barium sulfate and kaolin.

Further, the ceramic powder is used for preventing adhesion failure, contamination, floatation and the like, which is likely to occur due to the flow of the paint, by imparting thixotropy to the waterproof paint composition so as to exhibit strong adhesive strength and strength, An alkali silicate powder is used. Preferably potassium silicate or sodium silicate. In this case, the ceramic powder is contained in an amount of 10 to 20 parts by weight. If the amount is less than the above range, the effect of improving the adhesiveness and improving the workability is insignificant, and if it exceeds the above range, the adhesiveness is lowered and the flexibility of the coating film may be lowered.

In the present invention, the film forming agent is included in an amount of 0.5 to 10 parts by weight. When the amount is less than the above range, there may be a problem such as cracking at a low temperature. When the amount exceeds the above range, There may be a problem in workability.

If the content of the antifungal agent is less than 0.2 parts by weight, the physical properties of the antifungal agent may be changed and the distribution of the antifungal agent may be difficult during storage. If the content of the antifungal agent is more than 0.3 parts by weight, the efficiency may be low.

If the amount of the preservative is less than 0.1 parts by weight, the storage stability at room temperature may deteriorate, and the physical properties of the product may change during storage. If the preservative exceeds 0.3 parts by weight, There may be a problem of low contrast efficiency.

In the present invention, the dispersing agent serves to disperse the particle components in the coating composition. If the amount is less than 0.1 parts by weight, such effects may be deteriorated. If the amount is more than 0.5 parts by weight, .

In addition, the cryoprotectant according to the present invention provides an effect of facilitating the coating operation of the coating composition by delaying rapid drying while ensuring stability of physical properties even at a cold temperature of -5 ° C. When the cryoprotectant is less than 0.5 parts by weight, There may be a problem in that the amount of the catalyst is lowered. When the amount of the catalyst is more than 0.7 part by weight, the efficiency may be low.

In addition, in the present invention, the wetting agent is a polymer having a pigment-affinity group, which can aid dispersion of pigment and resin, prevent re-aggregation, and can be a siloxane copolymer selected from nonionic surfactants. If the amount is less than 10 parts by weight, such effects may be deteriorated. If the amount is more than 15 parts by weight, there may be a problem that the efficiency is lower than the amount used.

In the present invention, the antifoaming agent is used for suppressing bubbles in the coating composition to form a uniform coating film. In the present invention, the antifoaming agent is composed of any one selected from a nonionic system and a silicone system. The defoaming agent serves to remove air bubbles remaining at the time of use of the coating composition. When the amount is less than 10 parts by weight, the effect of removing air bubbles is deteriorated. When the amount exceeds 15 parts by weight, efficiency with respect to the amount used is low.

In the present invention, the thickener is used for controlling the viscosity of the waterproof paint composition to prevent sedimentation of the pigment and improve workability upon painting. In the present invention, the thickener is selected from the group consisting of hydroxyethylcellulose, bentonite, urethane, It is composed of any one component. In the present invention, it is preferable to include 5 to 15 parts by weight.

As described above, the waterproof coating composition according to the present invention comprises a ceramic powder and an acrylic mixed resin, and in particular, an acrylic mixed resin obtained by mixing a network-structured MMA mixed resin and a vinyl acetate powder resin, The present invention relates to a water-repellent, water-repellent, water-repellent, and water-repellent composition, which is excellent in waterproofness and performance, stain resistance, chemical resistance, weather resistance, egg yolk denaturation, surface gloss and flame retardancy, The elasticity can be imparted while the waterproof property is further improved, and the convenience of the construction can be remarkably improved. Accordingly, the waterproof coating composition according to the present invention has high elasticity and elasticity as well as high elasticity, and has excellent waterproof property and concealability. Thus, It is possible to prevent the paint film from being damaged at all and to prevent the crack portion from being enlarged by protecting the crack portion, and at the same time, the water penetrating into the crack portion and the coated surface can be completely blocked, It is possible to block various harmful components.

To this end, the coating composition according to the present invention is characterized in that the high-elasticity and high-adhesion waterproof coating composition is prepared by mixing and mixing water, antifungal agent, preservative, dispersant, cryoprotectant, wetting agent and antifoaming agent sequentially, A pigment and a ceramic powder are further added and mixed, and then an acrylic mixed resin and a film forming agent are added and mixed. Then, the viscosity of the mixture is adjusted while adding a thickening agent to form the waterproof coating composition of the present invention.

Accordingly, the present invention provides a method for producing a highly elastic and highly adhesive waterproof coating composition which does not require undercoat treatment using a ceramic powder and an acrylic mixed resin as another embodiment.

(A) 15 to 20 parts by weight of water, 0.2 to 0.3 parts by weight of a mold inhibitor, 0.1 to 0.3 parts by weight of a preservative, 0.1 to 0.5 parts by weight of a dispersant, 0.5 to 0.7 parts by weight of a cryoprotectant, 10 to 15 parts by weight of a wetting agent, And 10 to 15 parts by weight of water are sequentially added and mixed at 600 to 800 rpm to obtain a mixture. Whereby the mixture is prepared as a solvent in which the additives are homogeneously mixed.

(B) mixing the pigment and the ceramic powder, wherein 3 to 8 parts by weight of a color pigment, 20 to 30 parts by weight of an extender pigment, and 10 to 20 parts by weight of a ceramic powder are added to the mixture obtained through the step (a) After the addition, the pigment and the ceramic powder are homogeneously mixed by stirring at 1000 to 1200 rpm at a high speed. In the step (a), additives such as a dispersing agent are mixed homogeneously, and then the pigment and the ceramic powder are mixed further, so that more uniform dispersion and mixing can be achieved at this stage.

Next, in step (c), 30 to 40 parts by weight of the acrylic mixed resin and 0.5 to 10 parts by weight of the film-forming agent are mixed with the acrylic mixed resin and the film forming agent for at least 1 hour While stirring at 1000 to 2000 rpm. In this step, the acrylic mixed resin and the ceramic waterproofing agent must be well mixed to increase the penetration and adhesion to the base material. Therefore, in order to achieve good mixing, stirring is performed at the stirring speed while slowly adding over at least one hour It is important. Since the acrylic mixed resin has been described above, the description thereof will be omitted.

Next, the step (d) is carried out by adding 5 to 15 parts by weight of a thickener to the mixture obtained through the step (c) for at least 30 minutes while stirring at 1000 to 2000 rpm. Through this step, complete and homogeneous mixing is achieved between the constituents of the coating composition, and the mixture is adjusted to have an appropriate viscosity.

Finally, the viscosity-adjusted coating composition is commercialized through packaging.

According to still another aspect of the present invention, there is provided a method of applying a high elasticity and high adhesion waterproof coating composition using a ceramic powder and an acrylic mixed resin, which does not require undercoat pretreatment. A pretreatment step of removing foreign matters adhering to the base surface; And applying a highly elastic high adhesion waterproof coating composition using the ceramic powder and an acrylic mixed resin to the pretreated surface.

Since the high elasticity and high adhesion waterproof coating composition using the ceramic powder and the acrylic mixed resin according to the present invention is one-component type and can be applied promptly and easily, the waterproof coating composition has high adhesion It has excellent adhesion to the base surface and has very good elasticity which stretches like rubber and has excellent waterproof property and concealment. Therefore, it can be applied directly on the pretreated base surface without separate treatment. The present invention has the effect of remarkably improving the convenience of the apparatus. In addition, the coated film thus formed can prevent the coating film from being damaged at all, even if a fine crack occurs due to weather, temperature change, or the like on the coated surface after the application, It is possible to completely block the water penetrating through the part and the surface and to block various harmful components of the building structure flowing out from the crack part and to exhibit excellent abrasion resistance, weather resistance, waterproofness, incombustibility and flame retardancy, Can be eco-friendly and efficiently applied to the exterior of a building or a steel structure such as a steel bridge, an elevated road, a steel tower, or the like.

Hereinafter, embodiments of the present invention will be described in detail, but the present invention is not limited thereto.

≪ Examples 1-3 > Preparation of MMA mixed resin

In the present embodiment, a reaction process of modifying an acrylic resin into a special network type was carried out according to each condition, and the properties thereof were measured.

Concretely, 3 g of the surfactant and 600 g of ion-exchanged water were mixed, and the mixed mixture was heated to 80 캜 while stirring at 100 RPM to prepare samples 1 to 3. In each of the examples, 4 g of the initiator and 1400 g of the acrylic monomer mixture pre-emulsion were added and reacted. After aging at 70 ° C for 90 minutes, the pH of the aged mixture was adjusted to 9, 30 g of crosslinked polymer was added, Followed by stirring to complete the resin.

The reaction conditions are as follows.

Example 1 A sample was prepared by mixing 1400 g of the acrylic monomer mixture pre-emulsion at a time and reacting. The sample of Example 2 was reacted with 1400 g of the acrylic monomer mixture pre-emulsion for 3 hours while the sample of Example 3 was reacted with the acrylic monomer mixture free 100 g was added to 1400 g of the emulsion, followed by a first reaction for 15 minutes and a second reaction with dropping the remaining 1300 g for 3 hours.

The results of measurement of physical properties are shown in Table 1 below.

Test Items Test Methods Example 1 Example 2 Example 3 Mirror gloss KS M ISO 2813
200 μm on glass plate 63 65 68 Scratching hardness
(Pencil method) KS M ISO 15184
Pencil light pencil hardness 2B B H Abrasion resistance (mg)
(Abrasive wheel method) JIS K 5600-5-9
Wear Wheel CS-17
Load 500 g × 2 · 1000 rotations 71 73 82 My method KS M ISO 2812
7 days immersion in tap water clear clear clear Alkali resistance KS M ISO 2812 Sodium carbonate 5% aqueous solution for 48 hours clear clear clear Acid resistance KS M ISO 2812 Immersion in 5% sulfuric acid aqueous solution for 48 hours clear clear clear Water temperature After immersing in 50 ° C hot water for 48 hours, drying clear clear clear Formaldehyde dissipation JIS K 5970 Desiccator method 0.10 mg / L
Below 0.10 mg / L
Below 0.10 mg / L
Below Network structure Morphology

As can be seen from the above Table 1, the performance of Example 3 in which the acrylic monomer mixture pre-emulsion was added all at once or slowly added dropwise, It can be confirmed that the network-structure acrylic resin produced according to the present invention can remarkably improve the adhesion to the surface of the construction by forming a special network-like structure.

<Preparation Example> Preparation of Coating Composition

The following Table 2 shows the mixing ratio of the coating composition. The mixture was stirred sequentially in the order of ① to ⑦, and stirred at a speed of 600 to 800 rpm for 100 minutes. Next, ⑧ to ⑩ were put into an agitating cylinder and stirred at a speed of 1000 to 1200 rpm for 60 minutes. Next, ⑪ and ⑫ were slowly added to an agitating bar over 60 minutes and stirred at a speed of 1000 to 2000 rpm. Finally, the ⑬ thickener was slowly added to the agitator over a period of at least 30 minutes, and the viscosity was adjusted by stirring at a speed of 1000 to 2000 rpm.

product name Weight (unit: g) ① Water - 15-20 ② Fungicide Silver 0.2 to 0.3 ③ Antiseptics 0.1 to 0.3 ④ Dispersing agent BYK-220s 0.1 to 0.5 ⑤ Antifreezing agent P.G 0.5 to 0.7 ⑥ Wetting agent BYK-154 10 to 15 ⑦ Antifoaming agent DF-75 10 to 15 ⑧ Colored pigment TIO2-902 3 to 8 ⑨ Extendable pigment Stone 20 ~ 30 ⑩ Ceramic powder Potassium silicate 10-20 ⑪ Acrylic mixed resin Emulsion-7132 30 to 40 ⑫ Coating agent TEXANOL 0.5 to 10 ⑬ Thickener BYK-420 5 to 15

The specific gravity of the prepared product was 1.35 ± 1.01 kg / ℓ (25 ℃) and the solid content (%) was 55 ± 2.

<Test Example>

A coating composition was prepared in accordance with the above Preparation Example except that the content ratio of the vinyl acetate-based powder resin (vinyl acetate / ethylene copolymer) was changed to 50 parts by weight of the MMA mixed resin in the acrylic mixed resin, The results are shown in Table 3 and FIG.

Test Example 1 Test Example 2 Test Example 3 Remarks Vinyl acetate / ethylene copolymer content
(Parts by weight) 45 55 65 Appearance offshoot clear Cracks and grain formation Visual inspection Elasticity (elongation at break) 450N / mm or less 650N / mm or more 510N / mm or less KS F 3211: 2008 Attachment (Method A) 3A  5A 4A ASTM D 3359-09 Weatherability good good good KS F 2274-'02

Referring to Table 3 and FIG. 1, which shows the external appearance of the coating film, it is seen that in Test Example 1 in which the content of the vinyl acetate / ethylene copolymer is small as shown in FIG. 1 (a) , And the favorability is relatively low. In Test Example 3 (FIG. 1 (c)) in which the content of the vinyl acetate / ethylene copolymer was high, it was confirmed that the elasticity was higher than that of FIG. 1 (a). In the case of Test Example 2 in which the MMA resin and the vinyl acetate / ethylene copolymer resin were mixed in a weight ratio of 50:55, as shown in FIG. 1 (b), the smooth coating film and the crack were not formed, Was the best.

FIG. 2 shows the quality test report for the coating composition prepared by the method of Test Example 2, showing excellent tensile performance, tearing performance, and dropping resistance performance.

Thus, the coating composition of the present invention exhibits excellent elasticity and adhesion, has excellent waterproofing performance and mechanical properties, and is convenient for construction because it contains acrylic mixed resin and ceramic powder. Therefore, And can be applied to the outside of steel structures such as bridges, overpasses, and steel towers forcibly and efficiently.

Claims (5)

30 to 40 parts by weight of an acrylic resin mixture, 15 to 20 parts by weight of water, 3 to 8 parts by weight of a color pigment, 20 to 30 parts by weight of an extender pigment, 10 to 20 parts by weight of a ceramic powder, 0.5 to 10 parts by weight of a film forming agent, 0.1 to 0.3 parts by weight of a preservative, 0.1 to 0.5 parts by weight of a dispersant, 0.5 to 0.7 parts by weight of a cryoprotectant, 10 to 15 parts by weight of a wetting agent, 10 to 15 parts by weight of a defoaming agent and 5 to 15 parts by weight of a thickener ,
The acrylic mixed resin is obtained by mixing an MMA mixed resin prepared by emulsion polymerization of methyl methacrylate (MMA) monomer, 2-ethylhexyl acrylate (2-EHA) and acrylic acid (AA) at 60 to 80 ° C, The powdery resin is mixed in a ratio (weight ratio) of 50:50 to 60,
Characterized in that the ceramic powder is an alkali silicate powder,
A high elasticity, high adhesion waterproof coating composition using a ceramic powder and an acrylic resin mixture without requiring a pretreatment. The method according to claim 1,
In the MMA mixed resin,
(i) mixing a surfactant with ion-exchanged water and raising the temperature thereof with stirring to prepare a first mixture; (ii) an acrylic monomer mixture pre-emulsion comprising a methyl methacrylate (MMA) monomer, a 2-ethylhexyl acrylate (2-EHA) monomer, an acrylic acid (AA), a surfactant and ion- To produce a second mixture; (iii) aging the second mixture to prepare a third mixture by adjusting the pH thereof, and (iv) adding a crosslinking polymer to the third mixture to adjust the physical properties of the mixture. Acrylic resin,
The vinyl acetate based powder resin may be selected from the group consisting of vinyl acetate / ethylene copolymer, vinyl acetate / acrylate copolymer, vinyl acetate / vinyl ester copolymer, vinyl acetate / vinyl versatate copolymer, vinyl acetate / vinyl ester / Ethylene terpolymer, a vinyl acetate / vinyl laurate / vinyl versatate ternary interpolymer, and a vinyl acetate / vinyl versatate / acrylic ester ternary interpolymer.
A high elasticity, high adhesion waterproof coating composition using a ceramic powder and an acrylic resin mixture without requiring a pretreatment. (a) 15 to 20 parts by weight of water, 0.2 to 0.3 parts by weight of a mold inhibitor, 0.1 to 0.3 parts by weight of a preservative, 0.1 to 0.5 parts by weight of a dispersant, 0.5 to 0.7 parts by weight of a cryoprotectant, 10 to 15 parts by weight of a wetting agent, And 15 parts by weight of a polyvinyl alcohol are sequentially added and mixed while stirring at 600 to 800 rpm to produce a mixture;
(b) 3 to 8 parts by weight of a color pigment, 20 to 30 parts by weight of an extender pigment, and 10 to 20 parts by weight of a ceramic powder are added to the mixture after the step (a) Followed by high-speed stirring at 1000 to 1200 rpm;
(c) stirring the mixture obtained through the step (b) at 1000 to 2000 rpm while adding 30 to 40 parts by weight of an acrylic mixed resin and 0.5 to 10 parts by weight of a film forming agent for at least 1 hour; And
(d) stirring at 1000 to 2000 rpm while adding 5 to 15 parts by weight of a thickener to the mixture after the step (c) for at least 30 minutes,
The acrylic mixed resin is obtained by mixing an MMA mixed resin prepared by emulsion polymerization of methyl methacrylate (MMA) monomer, 2-ethylhexyl acrylate (2-EHA) and acrylic acid (AA) at 60 to 80 ° C, The powdery resin is mixed in a ratio (weight ratio) of 50:50 to 60,
Characterized in that the ceramic powder is an alkali silicate powder,
A method for manufacturing a highly elastic and highly adhesive waterproof coating composition which does not require undercoat pretreatment using a ceramic powder and an acrylic resin mixture The method of claim 3,
In the MMA mixed resin,
(i) mixing a surfactant with ion-exchanged water and raising the temperature thereof with stirring to prepare a first mixture; (ii) an acrylic monomer mixture pre-emulsion comprising a methyl methacrylate (MMA) monomer, a 2-ethylhexyl acrylate (2-EHA) monomer, an acrylic acid (AA), a surfactant and ion- To produce a second mixture; (iii) aging the second mixture to prepare a third mixture by adjusting the pH thereof, and (iv) adding a crosslinking polymer to the third mixture to adjust the physical properties of the mixture. Acrylic resin,
The vinyl acetate based powder resin may be selected from the group consisting of vinyl acetate / ethylene copolymer, vinyl acetate / acrylate copolymer, vinyl acetate / vinyl ester copolymer, vinyl acetate / vinyl versatate copolymer, vinyl acetate / vinyl ester / Ethylene terpolymer, a vinyl acetate / vinyl laurate / vinyl versatate ternary interpolymer, and a vinyl acetate / vinyl versatate / acrylic ester ternary interpolymer.
A method for manufacturing a high elasticity and high adhesion waterproof coating composition using a ceramic powder and an acrylic mixed resin without requiring a pretreatment. A pretreatment step of removing foreign matters adhered to the substrate; And
A waterproof paint composition comprising the ceramic powder according to any one of claims 1 and 2 and an acrylic mixed resin is applied to the pretreated surface of the waterproof coating composition. Way.

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