KR20000072868A - One-Package Type Membranous Waterproof Composition and Construction Method therefor - Google Patents

Abstract

PURPOSE: An aqueous acrylic one-component film waterproof agent composition capable of preventing the leakage of water generated by cracking of structures and the fracture of a film and having excellent physical properties such as adhesion to a substrate, weather resistance, durability and cold resistance and waterproof construction method employing the same are provided which are easy to use, reduce labor cost and are harmless and nontoxic. CONSTITUTION: The color film waterproof agent comprises 50 to 70% by weight of an acrylic emulsion, 1 to 5% by weight of water, 0.1 to 0.5% by weight of a dispersing agent, 0.5 to 1% by weight of a deforming agent, 5 to 10% by weight of a pigment, 15 to 35% by weight of an inorganic filler, 0.1 to 2% by weight of a dissolution aid, 0.01 to 0.5% by weight of a freeze stabilizing agent, 0.1 to 1.5% by weight of a thickening agent and 0.1 to 1.5% by weight of other additives. The waterproof construction method comprises the steps of executing slope work to enable water to flow easily on the concrete (10), forming an adhesion layer (11) by coating a primer on the surface of a substrate, forming a plurality of waterproof films (12) by coating a one-component film waterproof agent on the surface of the adhesion layer several times and forming a protective film (14) by coating a film protecting agent on the surface of the waterproof film.

Description

Water-soluble 1-part coating waterproof composition and composite coating waterproofing method using the same {One-Package Type Membranous Waterproof Composition and Construction Method therefor}

The present invention relates to a water-soluble one-part coating waterproofing composition and a waterproof construction method using the same, in particular, to form a high-elasticity, high-strength coating to prevent leakage caused by breakage of the coating due to cracks and fractures of the structure, weather resistance, The present invention relates to a water-soluble acrylic one-component elastic coating film waterproofing composition having excellent durability and cold resistance and containing an acrylic emulsion as a binder, and a waterproof construction method using the same.

Furthermore, the present invention is a one-component product, so anyone can use it easily, and the mixing / stirring process in the case of using a two-component waterproofing agent and the time and equipment are not necessary, thereby saving labor costs and being water-soluble, so it is harmless and non-toxic. DIY The concept relates to a color coating waterproofing composition.

In general, leaks and condensation due to cracks occur on the base of inorganic materials such as concrete or mortar forming a building, and this problem plays a role in facilitating aging of the building by weakening the durability of the building. Therefore, as a new product that can prevent the cause of such defects, it is possible to prevent the leakage due to the breakdown of the waterproof coating by giving elasticity of the waterproof layer, and cracks and breakage of the coating due to the crack of the structure occurs. A new concept of waterproofing film is required.

Conventional methods for waterproofing rooftop floors include rubber asphalt waterproofing, urethane coating waterproofing, and asphalt (heating method) waterproofing. These methods are chemical, physical, and deterioration factors due to impermeable coatings on concrete slab floors. Deterioration such as bulge, crack, peeling, breakage, etc. is caused by the action of external force such as this, and the leak occurs at the site where the defect occurs, and the joint site of the dissimilar materials such as parapat and drain and the site where stress is concentrated. Is occurring a lot.

Therefore, in general, in the rooftop waterproofing, the waterproofing method is appropriate in consideration of the waterproofing function against rainfall, the reduction of solar heat load due to sunlight, and the ability of the snow load and weathering load to bear the loading load acting on the roof surface. It is necessary to choose a waterproofing material.

Conventional asphalt waterproofing uses asphalt-based products, which are adhesive materials that have been used as a laminating adhesive material when defects occur due to the lifting and peeling of cement liquid waterproofing, and they are less prone to temperature stress due to their low elongation at low temperatures and are easily crushed. There is a drawback, and the waterproof against the stress caused by the behavior (shrinkage, expansion) of the sphere has a problem that the waterproof layer is destroyed when the resistance to shrinkage, expansion and cracking of the material becomes weak. In addition, when waterproofing asphalt, equipment for heat-sealing asphalt is required.

In addition, the urethane film waterproofing using a two-component urethane film waterproofing agent is exposed to the outside of the waterproofing layer, resulting in temperature fluctuations such as heat and cold, damage to the waterproofing layer due to direct sunlight, and deterioration and swelling (phenomena). When the impact is applied directly to the waterproofing layer, the waterproofing layer is easily damaged, and artificial defects may occur, and when the mixture is used in a two-component type, poor curing state may occur due to improper use of agitation and blending.

In addition, the tensile force of the waterproof layer is acted upon by the pressure generated by the vapor pressure of water or a solvent to promote deterioration, thereby generating bubbles, and in severe cases, the peeling of the coating film may occur. In addition, the urethane coating film has a low adhesion strength to the protective mortar, there is a difficulty in non-exposure waterproof construction.

Conventionally, the coating film waterproofing agent is mostly composed of two-part type, and is composed of an emulsion type binder composed mainly of an organic polymer and a powder type inorganic filler composed mainly of cement.

However, in the case of using the two-component waterproofing agent, there is a problem in that a labor cost increases due to the time and equipment required for mixing / stirring a binder and a filler in a construction site.

In addition, since oil-based (organic) coating film such as urethane waterproofing agent should use a solvent of petroleum as a solvent, the builders working in a closed space may be damaged and thus workability is bad. In particular, the urethane-based one-part waterproofing agent has a significant disadvantage that it does not raise the thick film because it is cured by moisture.

In addition, since the conventional film waterproofing agent is not all water-soluble, there is a problem that the construction is impossible when the water content is high because of low affinity for residual moisture of the concrete slab.

Thus, D.I.Y. is a one-part, pre-mixed binder and filler, harmless / non-toxic, water-soluble, environmentally friendly, easy to use and convenient, and has the same high-elasticity and high-strength properties as a two-part waterproofing agent. The development of a new coating film waterproofing concept is required.

Therefore, the present invention has been made in view of the problems of the prior art, the object of which is to form a high-elasticity, high-strength coating film to prevent leakage caused by the breakage of the coating film due to the crack and fracture of the structure, It provides excellent physical properties such as adhesion, weather resistance, durability, cold resistance, and the like, and a water-soluble acrylic one-component elastic coating film waterproofing agent composition containing an acrylic emulsion as a binder and a waterproof construction method using the same.

Another object of the present invention is a one-component product that is easy to use for anyone, and the mixing / stirring process in the case of using a two-component waterproofing agent and thus does not require time and equipment, thereby saving labor costs and being water-soluble, thus harmless / non-toxic. Friendly DIY It is to provide a concept color coating waterproofing composition.

1 is a cross-sectional view showing a four-layer waterproofing composite coating waterproofing structure using a one-part coating waterproofing composition according to the present invention,

2 is a cross-sectional view showing another composite film waterproof structure including a film reinforcing agent according to the present invention,

3 is a cross-sectional view showing another composite coating waterproof structure according to the present invention.

* Explanation of Signs of Major Parts of Drawings *

10; Concrete plate 11; Adhesive layer

12; First waterproofing film 13; 2nd waterproofing film

14; Protective film 15; 3rd waterproofing film

20; Film reinforcement

In order to achieve the above object, the water-soluble one-component color coating waterproofing composition of the present invention is 50-70% by weight of acrylic emulsion, 1-5% by weight of water, 0.1-0.5% by weight of dispersant, 0.5-1% by weight of antifoaming agent, pigmented pigment It consists of 5-10% by weight, 15-35% by weight inorganic filler, 0.1-2% by weight coarse, 0.01-0.5% by weight freeze stabilizer, 0.1-1.5% by weight thickener and 0.1-1.5% by weight other additives.

The acrylic emulsion used as the binder main component of the coating film waterproofing agent composition has a particle size of less than 0.3㎛ acrylic resin to suppress the formation of micropores when forming the coating film, to form a compact structure between the binder, elongation and waterproofing performance This is excellent. For this purpose, the acrylic emulsion has a solid content of 40-55%, using 50-70% by weight of the total waterproofing agent. In this case, when the content of the emulsion is less than 50% by weight, it is not sufficient to form a solid structure due to the lack of a binder compared to the filler, and the weatherability due to the outdoor exposure of the coating is insufficient, which is not only waterproof but also insufficient adhesion to the surface of the coating due to aging of the coating. As a result, the detachment phenomenon of the waterproofing coating appears. In addition, in the case of more than 70% by weight, the aging of the emulsion is promoted, and the durability and wear resistance of the coating film are insufficient, making it difficult to impart the characteristics as a long-term coating film waterproofing agent. However, the content of the above-mentioned emulsion is set in the case where the solid content is 40-55%, and when the emulsion having a high solid content is used, it is necessary to relatively reduce the content of the emulsion.

In addition, the water serves to control the thickness during the production of the coating waterproofing agent and the formation of the waterproofing layer, the content of which is 1-5% by weight, when added more than 5% by weight lowers the solid content of the product dried film It is not formed to the level required by the thickness of the, and the physical properties such as the firmness, strength, elongation of the coating film is lowered. In addition, since water is used as a diluent and washing agent in the manufacturing process, at least 1% by weight should be added.

In general, in the one-part coating waterproofing agent, in order to maintain a stable state while the acrylic emulsion and the inorganic filler are mixed, the inorganic filler should be well dispersed or wet. Therefore, the state of dispersion in the coating agent has a great influence on the physical properties of the final cured coating film, which becomes an element that determines the physical properties of various coating films such as wear resistance, dichroism of the coating film, color separation phenomenon, smoothness, gloss, and weather resistance. . In view of this point, the dispersant used in the present invention uses 0.1-0.5% by weight (recommended mole number: 30-60 mole) of nonionic surfactant. In this case, when the dispersant is used in an amount less than 0.1% by weight, precipitation or syneresis occurs during storage due to lack of dispersibility and wetting power of the inorganic filler. It is a cause of deterioration of water resistance and chemical resistance.

Antifoaming agent suppresses bubble generation by mixing powder during mixing of emulsion and inorganic filler powder, and it is added in order to give defoaming effect of bubbles generated by roller work during construction in the range of 0.5-1% by weight. It is added in a small amount, and when applied in excess of 1% by weight, reduces the water resistance of the waterproof coating. The antifoaming agent prevents coating bonds due to bubbles, ie, lifting and swelling, and removes the internal and external bubbles of the formed coating film, thereby providing a firm and strong bond to the coating film, thereby preventing loss of tensile strength and adhesive strength. Function.

Colored pigments serve to impart color, and the pigment itself is not expensive because it is expensive and the amount of addition is large. The content is preferably 5-10% by weight, but when it is used below 5% by weight, it cannot give the required color. When it is used by more than 10% by weight, the price of the product increases and the strength of the waterproof coating film, It acts as a cause of lowering elongation and weather resistance.

On the other hand, the inorganic filler used in the present invention can be used calcium carbonate and clay (clay), etc., and serves to form a solid coating film by working with the acrylic emulsion. To this end, the inorganic filler is used 15-35% by weight, but when used in less than 15% by weight does not act as a filler, when containing more than 35% by weight can not expect the elasticity of the waterproof coating. In addition, the average particle of calcium carbonate to be used is to determine the reduction of the coating surface, it is generally possible to use between 0.5-200㎛, preferred particle size is in the range of 10-130㎛.

The co-solvent is used to obtain the characteristics of the waterproof coating and the hardened coating film by controlling the coating environment by controlling the minimum coating film formation temperature (MFFT) of the coating film binder. It is preferable to use 0.1-2% by weight. In this case, when the content is 0.1% by weight or less, it does not play a role as a coating film forming aid, and when used by 2% by weight or more, the emulsion stability of the acrylic emulsion as a binder is impaired, resulting in impaired stability of the emulsion and defects in the coating film.

The freeze stabilizer uses a polyhydric alcohol solvent and preferably 0.01-0.5% by weight, and when used at 0.01% by weight or less, there is no freeze stability effect. It acts to reduce. The amount of addition may increase because it greatly affects the properties of the emulsion used.

Although one or more types of thickeners used for viscosity control may be used depending on the coating properties, it is preferable to select one type of product if possible, and the use of the thickeners gives workability of the coating agent, It improves salinity and greatly affects the painting characteristics of the product. The content is preferably 0.1-1.5% by weight, and when used in an amount of 0.1% by weight or less, no thickening effect occurs, and when used in an amount of 1.5% by weight or more, the fluidity of the coating agent is lost, resulting in insufficient workability and forming a uniform coating film. This difficulty makes it impossible to obtain uniform properties of the waterproof coating.

Other additives include various stabilizers such as pH stabilizers and viscosity stabilizers for imparting stability of the product, such as inorganic fillers settled during long-term storage, and preservatives to prevent water from deteriorating because they contain water. The amount used is enough to exhibit sufficient performance even by the addition of a small amount, respectively, and is used in the range of 0.1-1.5% by weight as a whole.

Such a one-part elastic coating waterproofing agent can be easily used, for example, on the roof of an apartment or a building, the overall waterproofing of a veranda, the waterproofing of general walls, the waterproofing of new buildings and repairs, and the places requiring exposure waterproofing.

On the other hand, the composite coating waterproof construction method using the coating film waterproofing agent of the present invention comprises the step of performing a water refining process to achieve a smooth water drainage to the concrete surface, the step of applying a primer to the surface to form an adhesive layer, the adhesive layer Forming a plurality of waterproof films by applying a one-part coating waterproofing agent to the upper surface a plurality of times, and forming a protective film by applying a coating protection agent to the upper surface of the waterproofing film.

The composite coating waterproof construction method may include inserting fiber glass or nonwoven fabric as a film reinforcing agent between a plurality of waterproof films.

Therefore, the overall number of processes is determined by the number of coatings of the coating waterproofing agent and the addition of the coating reinforcing agent.The composite coating film can be divided into non-exposed type or exposed type according to whether to use a protective mortar or a top coating agent. Can be.

In addition, primers can use either one-component or two-component. In this case, the one-component type is water-soluble, so it is easy to handle and has excellent workability, while the surface of the paper must be well organized. If the surface of the base is poorly disposed, the adhesiveness and the adhesive strength of the waterproof coating may be insufficient, resulting in swelling of the waterproof coating and detachment of the waterproof coating.

On the other hand, since the two-component primer is an oil-based type, the binder and the inorganic filler should be mixed and used in an appropriate ratio. The two-component type can be applied even when the surface is poor, and can compensate for problems such as a decrease in adhesion strength and a decrease in adhesion strength of the waterproof coating film due to foreign substances.

The top coating agent used as an exposure type is water soluble and improves the durability, weather resistance and scratch resistance of the waterproof coating and serves as the primary protective film of the waterproof coating.

(Example)

(One-component elastic coating film waterproofing agent)

The film properties of the water-soluble acrylic one-part elastic coating film waterproofing agent composition according to the present invention described above will be examined through Examples.

Examples 1-4

First, the composition of the one-part elastic coating waterproofing agent is configured as shown in Table 1 below to prepare Examples 1 to 4. For each example, first, the acrylic emulsion 1/3 and water were added to the blender in the composition shown in Table 1, followed by addition of a nonionic surfactant, an antifoaming agent, and a coloring pigment, followed by stirring at 2500 ± 500 rpm for 1 hour. After completion of the dispersion, precipitated calcium carbonate, clay, co-solvent, and freeze stabilizer were added and stirred at 2000 ± 500 rpm for 30 minutes, followed by mixing the thickener and the preservative as other additives, and then in order to remove the air bubbles sucked into the composition. Defoaming with stirring at 1000 ± 200 rpm for 1 hour and 30 minutes while maintaining the pressure to 700mmHg to prepare the coating film waterproofing agent composition of Examples 1 to 4.

Subsequently, for the coating film waterproofing agent composition of Examples 1 to 4, that is, the test method described in Table 2, that is, elongation at break (%) is KS F 3211, water permeability is KS F 2451, and tensile strength (kgf / cm 2) KS F 3211, low temperature storage stability, JIS A 6909, temperature dependence measured in the physical properties of the coating film according to KS F 3211 and listed in Table 1.

Comparative Example 1 and Comparative Example 2

Comparative Example 1 and Comparative Example 2 were prepared in the same manner as in the preparation of the above-described examples as the composition shown in Table 1 to make the coating film waterproofing agent composition of Comparative Example 1 and Comparative Example 2, the physical properties of the coating film according to the experimental method described in Table 2 below Was measured and listed in Table 1.

Unit: parts by weight Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Comparative Example 2 Acrylic emulsion 100 100 85 85 120 60 water 9.49 9.49 9.49 9.49 9.49 9.49 Dispersant 0.5 0.5 0.1 0.5 0.5 0.5 Antifoam 0.7 0.7 0.7 0.7 0.7 0.7 Pigmentation Pigment 11.8 11.8 11.8 11.8 11.8 11.8 Precipitated calcium carbonate, clay 50.6 62.0 50.6 62.0 50.6 62.0 Solvent 0.8 0.8 0.8 0.8 0.8 0.8 Freeze stabilizer 0.1 0.1 0.1 0.1 0.1 0.1 Thickener 1.3 1.3 1.3 1.3 1.3 1.3 Other additives (preservatives) 0.5 0.5 0.5 0.5 0.5 0.5 Elongation at Break (%) 530 450 380 220 650 180 Water resistance pass pass pass pass pass fail Tensile strength (kgf / ㎠) 26 29 24 15 9 10 Low temperature storage stability pass pass pass pass fail fail Temperature dependence (-20 ℃,%) Tensile strength ratio 230% (60) 251% (73) 208% (50) 213% (32) 178% (16) 190% (19) Elongation 270 200 220 150 290 95

Elongation at Break (%) KS F 3211 Water resistance KS F 2451 Tensile strength (kgf / ㎠) KS F 3211 Cold storage stability JIS A 6909 Temperature dependence (-20 ℃,%) Tensile strength ratio KS F 3211 Elongation

As described above, the Examples and Comparative Examples compared the physical properties by changing the amount of the emulsion and the inorganic filler that plays a role of the binder in the overall composition.

In Examples 1 and 2, the effect of inorganic fillers (ie, precipitated calcium carbonate and clay) was tested when the content of the emulsion was constant. When the content of the inorganic filler was increased, the elongation was decreased and the tensile strength was increased. It can be seen that there is a tendency to

Example 3 and Example 4 experiments the effect of the change in the inorganic filler in the minimum range of use of the emulsion, the elongation is lower than that of Examples 1 and 2 and the tensile strength also tends to fall. In particular, as in Example 4, the amount of emulsion decreased and the amount of the inorganic filler increased, resulting in a significant decrease in elongation and tensile strength than in Example 3.

On the other hand, in Comparative Example 1 in which the emulsion and the inorganic filler were set to values outside the content of the present invention, in Comparative Example 1 in which the emulsion content was outside the upper limit of the present invention, the maximum elongation was obtained, but the tensile strength was found to be the lowest value. In addition, Comparative Example 1 was found to be insufficient resistance to freezing stability due to the increase in the content of the emulsion.

In the case of Comparative Example 2, the content of the inorganic filler was relatively higher than the content of the emulsion, and the content of the emulsion was low, resulting in a decrease in elongation and a decrease in tensile strength.

(Composite coating waterproofing method)

Hereinafter, the composite coating waterproofing method using the one-part elastic coating waterproofing composition described above will be described in more detail with reference to the accompanying drawings in which preferred embodiments are shown.

1 is a cross-sectional view showing a waterproof structure constructed in accordance with the four-layer composite coating waterproof construction method of the present invention.

Composite coating waterproofing method using the coating film waterproofing agent of the present invention as described in the step 1 to perform a water refining work to achieve a smooth water drainage for the concrete base surface 10, the primer on the base surface (10) Coating to form an adhesive layer 11, applying the one-part coating waterproofing agent to the upper surface of the adhesive layer twice to form two layers of waterproofing films 12 and 13, and It is characterized by consisting of a step of forming a protective film 14 by applying a coating film protective agent.

To explain this in detail, first, when the water gradient on the base surface of the concrete surface 10 is a roof-top waterproofing for walking, as a first step process, the rainwater may have a gradient of 1/100 or more in the case of a non-pedestrian roofing waterproofing. It is possible to smoothly drain without stagnation, and cures the moisture content of the base surface to preferably be 8% or less.

Subsequently, as a second step, the adhesive layer 11 is formed by applying a primer to the upper surface of the base surface 10. In this case, the primer can use Hanyang Waterproof Co., Ltd. "Star Coat 100 Primer" as a one-part type, and Hanyang Waterproof Co., Ltd. "SE-5330 (subject: Hardening agent = 2: 1)" Or apply | coat and dry at a coating amount of 0.3 kg / m <2> using a brush.

Subsequently, as the third step process, the one-part coating waterproofing agent is uniformly coated on the adhesive layer 11 with a thickness of 0.5 mm using a roller or a brush to form a first waterproof film 12 and dried. In this case, the coating amount is preferably 0.8 kg / m 2.

Thereafter, the second waterproof film 13 is applied in the same manner as the first waterproof film 12 to form a second waterproof film 13 and dried.

In the last 4 steps, the exposure method is a one-time use of a "star coat 100 coating agent" of Hanyang Waterproofing Co., Ltd. as a top coating agent on the upper surface of the second waterproofing film by using a brush or a roller at a requirement of 0.3 kg / m 2. Applying to form the protective film 14, all the processes are completed.

In the non-exposure method, cement mortar may be used as the passivation layer 14.

Upon completion of the first to fourth steps as described above, a composite coating waterproof structure as shown in FIG. 1 is obtained. Unlike the two-component product, the composite coating waterproof structure of the above embodiment does not need equipment for mixing / stirring the emulsion and the inorganic filler powder in the field, so that the construction can be easily performed, and the construction time and labor cost can be saved, and thus it is water-soluble. Harmless / nontoxic eco-friendly DIY It is a concept color coating waterproofing agent.

The composite coating waterproof structure shown in FIG. 1 is a structure suitable for waterproof construction of a place such as an alarm rooftop / veranda.

However, when the strength of the coating film is required such as an exposed rooftop, a composite coating waterproof structure as shown in FIG. 2 may be applied.

The embodiment shown in FIG. 2 is the embodiment shown in FIG. 1 except that a film reinforcement 20, such as a nonwoven or fiberglass, is additionally inserted between the first and second waterproofing films 12 and 13. It has the same structure as the example.

Therefore, also in the construction method for this, one step of applying the coating film reinforcing agent 20 made of nonwoven fabric or fiber glass in the middle of the first waterproof film 12 and the second waterproof film 13 in the third step Since it is constructed in the same manner as in the above-described embodiment except that it is added, a description thereof will be omitted.

In addition, the composite coating film waterproof structure shown in FIG. 2 adds a third waterproofing film 15 between the second waterproofing film 13 and the protective film 14 as shown in FIG. It is also possible. In this case, the third waterproof film 15 may be constructed with the same material, the same method, and the same thickness as the first and second waterproof films 12 and 13.

Of course, even in the waterproof structure shown in Figs. 2 and 3, a color waterproof coating is obtained when it is applied by the exposure method using the top coating agent as the protective film 14.

The one-part coating waterproofing agent of the present invention can be easily used for waterproofing a general wall as well as repairing a defective part of a building, as well as waterproofing a composite coating such as a roof or a veranda of an existing or new building.

As described above, the one-component acrylic elastic coating waterproofing agent according to the present invention forms a highly elastic and high strength coating film, thereby preventing leakage caused by breakage of the coating due to cracking and breaking of the structure, and adhesion to a small surface. It has excellent physical properties such as weather resistance, durability, and cold resistance, and is easy to use as a one-component product, and it is possible to save labor costs because it does not require a mixing / stirring process such as a two-component waterproofing agent and time and equipment. / Non-toxic, eco-friendly DIY It is a concept color coating waterproofing agent.

In the above, the present invention has been illustrated and described with reference to specific preferred embodiments, but the present invention is not limited to the above-described embodiments and is not limited to the spirit of the present invention. Various changes and modifications can be made by those who have

Claims (5)

Acrylic emulsion 50-70%, water 1-5%, dispersant 0.1-0.5%, antifoam 0.5-1%, colored pigment 5-10%, inorganic filler 15-35%, crude agent 0.1-2% A one-part color coating waterproofing composition, comprising:%, freeze stabilizer 0.01-0.5% by weight, thickener 0.1-1.5% by weight, other additives 0.1-1.5% by weight. The one-component color coating waterproofing composition of claim 1, wherein the acrylic emulsion has a solid content of 40-55% and a particle diameter of the acrylic resin contained is less than 0.3 µm. Conducting a refurbishment to ensure smooth drainage of the concrete surface; Applying a primer to the base to form an adhesive layer, Forming a plurality of waterproof films by applying a one-component coating waterproofing agent a plurality of times on an upper surface of the adhesive layer; Composite coating waterproofing method using a one-component coating waterproofing, characterized in that the step of forming a protective film by applying a coating film protective agent on the upper surface of the waterproofing film. According to claim 3, wherein the one-part coating waterproofing agent 50-70% by weight of acrylic emulsion, 1-5% by weight of water, 0.1-0.5% by weight of dispersant, 0.5-1% by weight of antifoaming agent, 5-10% by weight of pigmented pigment, inorganic It is an acrylic water-soluble elastic color coating waterproofing agent composed of 15-35% by weight of filler, 0.1-2% by weight of co-solvent, 0.01-0.5% by weight of freeze stabilizer, 0.1-1.5% by weight of thickener, and 0.1-1.5% by weight of other additives. Composite coating waterproofing method using liquid coating waterproofing agent. The method of claim 3, further comprising inserting a coating reinforcing agent between the plurality of waterproofing membranes.