KR102060601B1 - Water proof painting composition for concrete structure and painting method - Google Patents

Abstract

The present invention relates to a waterproof coating composition for a concrete structure and to a waterproof coating method and, more specifically, to a waterproof coating composition for a concrete structure using a surface coating agent, a ceramic coating agent, fluorine silane and the like to improve adhesion, chemical resistance and adhesion strength as well as improve waterproof performance of the concrete structure, and to a waterproof coating method.

Description

WATER PROOF PAINTING COMPOSITION FOR CONCRETE STRUCTURE AND PAINTING METHOD}

The present invention relates to a waterproof coating composition and a waterproof coating method for concrete structures, and more particularly, to improve surface adhesion, chemical resistance, and adhesion strength, and to improve the waterproofing performance on concrete structures. The present invention relates to a waterproof coating composition and a waterproof coating method for applied concrete structures.

In general, the corrosion protection of concrete structures is very important because various cracks and leaking factors such as water penetration, drying shrinkage, temperature expansion and contraction, poor casting and curing, etc. exist during waterproof coating of concrete structures.

In addition, since concrete structures are greatly affected by physical and chemical deterioration factors, securing watertightness by strengthening material properties or thorough construction management is an essential condition for the method of the structure.

On the other hand, concrete structures are exposed to poor environmental conditions, both physically and chemically, from construction, which negatively affects the safety of the structure as the performance of the material and the useful life of the structure decrease due to oxygen, moisture and salt in the air.

In addition, most architectural and civil structures are exposed to the outside and are affected by the natural environment such as sunlight, snow, and rain, and thus, organic coatings may inhibit aesthetics due to yellowing of the coating surface due to ultraviolet rays.

In addition, due to brittleness, the coating film is cracked, peeled off, discolored, and dropped, so that the structure cannot be protected and durability is lowered, resulting in the inconvenience and additional cost of continuous repainting.

Accordingly, the Republic of Korea Patent No. 10-1793194 discloses an environmentally friendly waterproof and anticorrosive method of the ceramic-based waterproof anticorrosive composition and concrete structure, but this is a water-soluble composition mixed with PVC is not satisfactory chemical resistance and adhesion strength.

In addition, the Republic of Korea Patent Registration No. 10-0943158 discloses a permeable coating method for concrete and cement, but this is only to penetrate the cement structure, such as a ceramic coating agent is added to the nano-sized silica lacks the chemical resistance and adhesion.

Republic of Korea Patent No. 10-1793194 Republic of Korea Patent No. 10-0943158

The present invention is to solve the above-mentioned problems, the waterproof coating composition and waterproof for concrete structures to which the surface coating agent, ceramic coating agent and fluorine silane, etc. are applied to improve the adhesion, chemical resistance and adhesion strength to improve the waterproof performance to the concrete structure It is intended to provide a painting method.

To this end, the waterproof coating method for concrete structures according to the present invention by applying a surface coating agent including a ceramic coating agent, cement, silica sand and surface-based inorganic waterproofing agent on the surface of the concrete structure to form a base film on the concrete structure Forming step; A primer coating step of applying an undercoat coating comprising an aqueous resin, a sol filler, and ion exchanged water to the base film; An intermediate coating step of applying an intermediate coating agent comprising an aqueous ceramic coating agent, an inorganic pigment, an intermediate inorganic waterproofing agent, and an additive on the undercoat; And a top coat coating agent comprising a fluorine silane, an acid group equivalent of 200 to 700 and an acid group polymer having a molecular weight of 5000 to 10000, and an ester including at least one ether group in the molecule. It is characterized in that it comprises a; top coating step of applying on.

At this time, the base film forming step is 300 to 350 parts by weight of a ceramic coating agent, 250 to 280 parts by weight of cement, 250 to 280 parts by weight of silica sand of No. 7 or 8, 30 to 45 parts by weight of surface-based inorganic waterproofing agent mixed and stirred It is preferable that the step of applying a thickness of 0.35 to 1.2kg / m ² on the surface of the concrete structure.

In addition, the undercoat coating step is to apply a coating material for the undercoat comprising 100 parts by weight of an aqueous resin, 5 to 20 parts by weight of a sol (sol) type filler and 100 to 140 parts by weight of ion-exchanged water to the base film (10) It is preferably a step.

In addition, the sol (sol) type filler is preferably made of any one or more of iron oxide, titanium dioxide, zinc oxide and alumina.

The intermediate coating step may include 350 to 400 parts by weight of the aqueous ceramic coating agent, 200 to 250 parts by weight of the inorganic pigment, 50 to 75 parts by weight of the intermediate inorganic waterproofing agent, and 4 to 10 parts by weight of the additive. It is preferable that the coating is a step of applying on the applied coating for coating.

In addition, the additive preferably includes a dispersant, an antifoaming agent, a pH adjusting agent and a thickener.

In addition, it is preferred that the intermediate inorganic waterproofing agent includes distilled water, potassium silicate, potassium silicate, silane and a surfactant.

In addition, the top coat step is a top coat coating agent comprising a coating coating for the intermediate coating containing 10 to 20 parts by weight of fluorine silane, 40 to 60 parts by weight of acidic polymer and 30 to 80 parts by weight of the ester coating 500 to 600 parts by weight on the intermediate coating. It is preferable that it is a step of applying.

In addition, the intermediate coating step (S30) is a step of applying the intermediate coating to a thickness of 0.15 to 0.35kg / m ² , the top coating step (S40) is 0.10 to 0.40kg / m ² It is preferable that the step of applying a thickness of.

On the other hand, the waterproof coating composition for a concrete structure is coated on the surface of the concrete structure to form a base coating on the concrete structure, including a surface coating agent comprising a ceramic coating agent, cement, silica sand and surface-based inorganic waterproofing agent; An undercoat coating agent applied to the base film and including an aqueous resin, a sol-type filler, and ion-exchanged water; A middle coating applied to the undercoat, the coating including an aqueous ceramic coating, an inorganic pigment, an intermediate inorganic waterproofing agent, and an additive; And an fluorine silane, an acid group equivalent weight of 200 to 700 and an acid group polymer having a molecular weight of 5000 to 10000, and an ester including at least one ether group in the molecule. Top coat; characterized in that it comprises a.

The present invention as described above can be improved by the waterproof coating composition and waterproof coating method for concrete structures to which the surface coating agent, ceramic coating agent and fluorine silane is applied, and also to improve the chemical resistance and adhesive strength of the building and civil engineering concrete structure. do.

1 is a view showing a coating layer structure applied to the surface of the structure by the waterproof coating composition for concrete structures according to the present invention.
2 is a flow chart showing a waterproof coating method for a concrete structure according to the present invention.
3a to 3d is a view showing a step-by-step coating state according to the waterproof coating method for a concrete structure according to the present invention.

Hereinafter, with reference to the accompanying drawings will be described in detail for the waterproof coating composition and waterproof coating method for concrete structures according to an embodiment of the present invention.

First, as shown in Figure 1, the waterproof coating composition for a concrete structure is to be used to paint a concrete structure, and includes a surface coating agent, a coating for undercoat, a coating for the middle and a coating for the top coat. Concrete structures are typical of structures such as construction and civil engineering, and include cement structures in addition to concrete.

As described in more detail below, the present invention sequentially forms the base film 10, the bottom coat layer 20, the middle coat layer 30, and the top coat layer 40 from the surface of the concrete structure CON.

Preferably, the miracle film 10 is formed after cleaning and surface cleaning to remove the foreign matter due to deformation, peeling, weathering or contamination of the structure so as to remove the foreign matter present on the surface of the concrete structure (CON).

In this case, the surface coating agent includes a ceramic coating agent, cement, silica sand, and an inorganic waterproofing agent for the surface, and forms a base coating layer 10 as applied to the surface of the concrete structure (CON). Thus, the adhesion to the concrete structure (CON) and the undercoat coating layer 20 is improved while providing waterproof properties.

Undercoat coatings include aqueous resins, sol-type fillers, and ion-exchanged water, and form an undercoat layer 20 when applied on the base film 10 to provide a high waterproofing effect even when applied thinly and environmentally friendly. And the adhesive force with the intermediate coating layer 30 of the upper layer is improved.

The intermediate coating agent includes an aqueous ceramic coating agent, an inorganic pigment, an intermediate inorganic waterproofing agent and an additive, and is applied on the undercoat coating layer 20 to further reinforce the waterproof resistance by the additive when forming the intermediate coating layer 30. Furthermore, while improving chemical resistance and adhesion strength, the interlayer adhesion between the undercoat coating layer 20 and the undercoat coating layer 40 is improved.

In addition to the above-mentioned intermediate coating agent, the top coat is composed of a fluorine silane, an acid group equivalent of 200 to 700 and an acid group polymer having a molecular weight of 5000 to 10000 and an ester including at least one ether group in the molecule. , Upon coating on the intermediate coating layer 30 to form a top coat layer (40). Therefore, it responds to the poor external environment.

On the other hand, as shown in Figure 2, the waterproof coating method for a concrete structure according to the present invention includes a base film forming step (S10), a bottom coating step (S20), a middle coating step (S30) and a top coating step (S40). In addition, if necessary, further includes a concrete structure (CON) surface treatment step (S10a) before the base film forming step (S10).

Surface treatment step (S10a) is to remove the foreign matter present on the surface of the concrete structure (CON) constituting the building or civil engineering structure, to remove the foreign matter due to deformation, peeling, weathering or contamination of the surface of the concrete structure (CON) Perform cleaning and surface cleanup work.

Next, as shown in Figure 3a, in the base film forming step (S10) after the surface treatment to remove the foreign matter to the surface of the concrete structure (CON) by applying a surface coating agent on the surface of the concrete structure (CON) Form.

If the base film 10 is formed in advance on the surface of the concrete structure CON before the paint is applied, the bonding force with the concrete structure CON is excellent compared to the case where the water-based paint is applied directly, and the repeated construction of the concrete structure is repeated. Prevents cracks from shrinking / expanding

Surface coatings include ceramic coatings, cement, silica sand, and surface-based inorganic waterproofing agents, which are applied to the surface of the concrete structure (CON), and then wait for a certain time for absorption and curing to be based on the concrete structure (CON). A film is formed.

Specifically, the surface coating agent is prepared by mixing and stirring 300 to 350 parts by weight of the ceramic coating agent, 250 to 280 parts by weight of cement, 250 to 280 parts by weight of silica sand of No. 7 or 8, and 30 to 45 parts by weight of the inorganic waterproofing agent for the surface.

The prepared surface coating agent is applied to the surface of the concrete structure to a thickness of 0.35 to 1.2 kg / m ² . If the coating amount is less than 0.35kg / ㎡, bubbles are generated through the pores and bubbles are continuously generated in the subsequent process, and when the coating amount exceeds 1.20kg / ㎡ is too thick, there is a problem that the coating film later cracks.

At this time, the ceramic coating agent, for example, by adding 110 parts by weight of a metal oxide sol to a solution of 120 parts by weight of alkoxy silane and 25 parts by weight of a silane coupling agent, 10 parts by weight of a zirconium compound and 10 parts by weight of an aluminum compound were added for about 12 hours. Can be prepared by reaction.

In addition, 50 to 280 parts by weight of the cement is mixed with the ceramic coating prepared as described above, and if possible, the fine silica sand No. 7 or No. 8 is added. After the cement and silica sand are added to the ceramic coating, stirring is started, and when stirring is started, 30 to 45 parts by weight of the surface-based inorganic waterproofing agent is mixed with the stirring.

The surface-based inorganic waterproofing agent is preferably prepared by stirring 30 to 40 parts by weight of potassium silicate, 13 to 23 parts by weight of potassium silicate, 5 to 15 parts by weight of silane, and 1.0 to 1.5 parts by weight of surfactant in 20 to 30 parts by weight of distilled water. .

These inorganic waterproofing agents are easy to construct and have excellent adhesion, and thus provide excellent permeability and water / water repellent effect when applied to materials such as concrete or cement. In addition, there is an effect of reinforcing the strength of the concrete surface in part, odorless, non-volatile, easy to paint and maintain a uniformly dissolved state continuously.

However, if less than 30 parts by weight of the inorganic waterproofing agent for the surface there is a problem that can not be provided to the target effect, such as permeability, water repellency and waterproofness, and if it exceeds 45 parts by weight not only increase the effect compared to the amount of use but also properties of other compositions Since it lowers, 30-45 weight part of inorganic type waterproofing agents are added.

Next, as shown in Fig. 3b, in the undercoat coating step (S20) by applying (coating) a coating material for the undercoat containing an aqueous resin, a sol (sol) type filler and ion-exchanged water on the base film (10), the base film The undercoat coating layer 20 is formed on the (10).

Specifically, in the base coating step (S20) to the base film 10, a coating material for the coating containing 100 parts by weight of the aqueous resin, 5 to 20 parts by weight of the sol (sol) type filler and 100 to 140 parts by weight of ion-exchanged water Apply.

The aqueous resin is environmentally friendly and prevents penetration of moisture and air, and may be any one or more selected from the group consisting of aqueous acrylic, aqueous ethylene vinyl acetate (EVA), and acrylic silicone resin.

In addition, the aqueous resin has an average particle diameter of 0.04 μm to 0.35 μm so that the particle size is 10 times or more smaller than the general aqueous resin. If the average particle diameter is less than 0.04um, the durability may be lowered. If the average particle diameter is more than 0.35um, the airtightness may be lowered.

For example, the aqueous resin may have a number average molecular weight of 10000 to 15,000, an acid value of 13 mg KOH / g, and a glass transition temperature of 30 to 50 ° C., thereby further improving adhesion and adhesion.

The sol-type filler is made of any one or more of iron oxide, titanium dioxide, zinc oxide and alumina, and improves the bonding strength between the compositions, there is a strong interlayer bonding strength between the base film 10 and the intermediate coating layer (30).

When the sol-type filler is less than 5 parts by weight of the aqueous resin, the adhesion of the paint including the base film 10 is lowered, and the coating layer is dropped. do.

Ion exchanged water is also called deionized water, and if the amount is less than 100 parts by weight compared to the aqueous resin, the viscosity becomes excessively high, resulting in poor workability during painting, and when it exceeds 140 parts by weight, the fluidity becomes excessive due to excessive fluidity. It is difficult to control and the surface tension is excessively increased, resulting in deterioration of properties.

Next, as shown in Figure 3c, the intermediate coating step (S30) is to apply an intermediate coating including an aqueous ceramic coating, inorganic pigments, intermediate inorganic waterproofing and additives on the coating for the undercoat, the ceramic coating is strength, adhesion, Excellent chemical resistance, heat resistance, ozone or UV resistance and durability.

Specifically, in the intermediate coating step (S30) in the intermediate coating coating comprising 350 to 400 parts by weight of the aqueous ceramic coating agent, 200 to 250 parts by weight of inorganic pigments, 50 to 75 parts by weight of the inorganic inorganic waterproofing agent and 4 to 10 parts by weight of additives Is applied over the undercoat to form a middle coating layer (30).

The aqueous ceramic coating agent is stirred with water, acrylic emulsion adhesive and filler filler for 20-30 minutes with inorganic dyes. Also, add inorganic waterproofing agent if necessary. Thereafter, as a additive, a dispersant, an antifoaming agent, a pH adjusting agent, and a thickener are added and stirred for further 60 minutes.

100-115 parts by weight of water, 50-75 parts by weight of an inorganic waterproofing agent, 75-950 parts by weight of an acrylic emulsion adhesive and 150-205 parts by weight of a filler filler are mixed with 200-250 parts by weight of an inorganic pigment to prepare an aqueous cerac coating. .

In addition, one of the additives are 0.3 to 0.6 parts by weight of the dispersant, 0.6 to 0.9 parts by weight of the defoaming agent, 0.6 to 1.2 parts by weight of the pH adjuster and 1.8 to 3.0 parts by weight of the thickener is added to the above composition and mixed and stirred.

Dispersants improve the safety of paint application by pulverizing and dispersing other components when mixed, and antifoams remove harmful bubbles that may remain when using paint. The thickener maintains viscosity, and the pH adjuster adjusts the pH value appropriately to counter acidity or alkalinity to stabilize the formulation of the paint.

In one embodiment, an inorganic waterproofing agent may be a waterproofing agent including distilled water, potassium silicate, potassium silicate, silane, and a surfactant, and calcium carbonate may be used as a filler.

The inorganic waterproofing agent is easy to construct, has excellent adhesive strength, and has elasticity, so that it is possible to simply apply the coating work using a brush, roller, or spray equipment, and can expect excellent water repellency / waterproof effect.

In addition, the inorganic waterproofing agent is odorless, non-volatile, so it is easy to paint and maintains a uniformly dissolved state, so there is no need to separately stir or further dilute during the work.

In this case, when the content of the inorganic waterproofing agent is less than 50 parts by weight, the problem of deterioration of permeability and water repellency / water resistance occurs. On the contrary, when the content of the inorganic waterproofing agent exceeds 75 parts by weight, there is a problem of low efficiency compared to the amount used.

However, the intermediate coating agent is preferably applied in a thickness of 0.15 to 0.35kg / m ² , if the coating amount is less than 0.15kg / ㎡ it is difficult to conceal the surface of the lower layer and the adhesion between the layers is also lowered, when applying more than 0.35㎏ / ㎡ The coating film flows down and wrinkles arise.

Next, as shown in Figure 3d, in the top coat step (S40) by using the intermediate coating as described above, to the intermediate coating is coated with a coating coating for addition and stirring the fluorine silane, acidic polymer and ester.

The acid group polymer preferably has an acid groups equivalent of 200 to 700 and a molecular weight of 5000 to 10000, and the ester preferably contains at least one ether group in the molecule.

Specifically, the top coat coating step (S40) is applied to the coating coating for top coat including 10 to 20 parts by weight of fluorine silane, 40 to 60 parts by weight of acidic polymer and 30 to 80 parts by weight ester 500 to 600 parts by weight of the intermediate coating.

At this time, the fluorine silane is able to form a coating film with strong chemical resistance and durability, and because of the low intermolecular attraction and surface tension of the compound, it is difficult to get wet with the solvent to improve the resistance to chemicals and the external environment.

If the added amount of the fluorine silane is less than 10 parts by weight, the chemical resistance function is lowered, and if it exceeds 20 parts by weight, the compatibility with the ceramic coating does not come out to occur the phenomenon that the interlayer separation.

On the other hand, the acid group polymers include vinyl resins, alkyd resins, ester resins, epoxy resins, silicone resins, and the like, of which vinyl resins are preferably used. Examples of the vinyl resin include acrylic acid, methacrylic acid and itaconic acid.

Thus, the addition of acidic polymers improves wear control, coating film formation and durability, and not only suppresses cracking even by salt, but also improves coating specifications by providing very good interlayer adhesion.

Esters are derived by addition reactions of cyclic or polycyclic anhydrides with ether alcohols to contain at least one ether bond in the molecule. At this time, the reaction molar ratio is appropriately in the range of 1: 1.1 to 2.0. Thus, the ester significantly reduces the internal stress and reduces the occurrence of cracks.

However, it is preferable to coat the coating for the coating to a thickness of 0.10 to 0.40kg / m ² . If the coating amount of the top coat is less than 0.10 kg / ㎡ it is difficult to conceal the intermediate surface as well as the interlayer adhesion is lowered, when coating more than 0.40 kg / ㎡ the coating film flows to cause wrinkles.

In the above, the specific Example of this invention was described above. However, the spirit and scope of the present invention are not limited to these specific embodiments, and various modifications and variations can be made without departing from the spirit of the present invention. If you grow up, you will understand.

Therefore, since the embodiments described above are provided to completely inform the scope of the invention to those skilled in the art, it should be understood that they are exemplary in all respects and not limited. The invention is only defined by the scope of the claims.

CON: Concrete Structure
10: base film
20: undercoat coating layer
30: intermediate coating layer
40: top coat layer

Claims (10)

A base film forming step (S10) of forming a base film on the concrete structure by applying a surface coating agent including a ceramic coating agent, cement, silica sand and an inorganic waterproofing agent for the surface to the surface of the concrete structure;
A primer coating step (S20) of applying an undercoat coating comprising an aqueous resin, a sol-type filler, and ion-exchanged water to the base film;
An intermediate coating step (S30) of applying an intermediate coating agent including an aqueous ceramic coating agent, an inorganic pigment, an intermediate inorganic waterproofing agent, and an additive on the undercoat; And
The coating coating for the intermediate coating comprising a fluorosilane, an acid group equivalent of 200 to 700 and an acid polymer having a molecular weight of 5000 to 10,000 and an ester containing at least one ether group in the molecule. Including a top coating step of applying (S40);
The sol-type filler constituting the coating for the undercoat includes any one or more of iron oxide, titanium dioxide, zinc oxide and alumina,
The additive constituting the intermediate coating agent includes a dispersant, an antifoaming agent, a pH adjusting agent and a thickener,
The intermediate inorganic waterproofing agent includes distilled water, potassium silicate, potassium silicateate, silane and surfactant,
The coating coating for the top coat includes 10 to 20 parts by weight of fluorine silane, 40 to 60 parts by weight of acidic polymer, and 30 to 80 parts by weight of ester in addition to 500 to 600 parts by weight of the intermediate coating. Way. The method of claim 1,
The base film forming step (S10),
0.35 parts by weight of a ceramic coating agent, 250 to 280 parts by weight of cement, 250 to 280 parts by weight of silica sand of No. 7 or 8, and 30 to 45 parts by weight of inorganic waterproofing agent for the surface were mixed and stirred on the surface of the concrete structure. Waterproof coating method for a concrete structure, characterized in that the step of applying to a thickness of 1.2kg / m ² . The method of claim 1,
The undercoat coating step (S20),
It is a concrete characterized in that the step of applying a coating for the base coating 10 containing 100 parts by weight of the aqueous resin, 5 to 20 parts by weight of the sol (sol) type filler and 100 to 140 parts by weight of ion-exchanged water Waterproof coating method for structures. delete The method of claim 1,
The intermediate coating step (S30),
For the coated undercoat, the coating material comprising 350 to 400 parts by weight of the aqueous ceramic coating agent, 200 to 250 parts by weight of the inorganic pigment, 50 to 75 parts by weight of the intermediate inorganic waterproofing agent, and 4 to 10 parts by weight of the additive. Waterproof coating method for a concrete structure, characterized in that the coating step on the coating. delete delete delete The method of claim 1,
The intermediate coating step (S30) is a step of applying the intermediate coating to a thickness of 0.15 to 0.35kg / m ² ,
The top coat coating step (S40) is a waterproof coating method for a concrete structure, characterized in that the step of applying the coating for the coating to a thickness of 0.10 to 0.40kg / m ² . In the waterproof coating composition for concrete structures,
A surface coating agent including a ceramic coating agent, cement, silica sand and an inorganic waterproofing agent for the surface to be applied to the surface of the concrete structure to form a base film on the concrete structure;
An undercoat coating agent applied to the base film and including an aqueous resin, a sol-type filler, and ion-exchanged water;
A middle coating applied to the undercoat, the coating comprising an aqueous ceramic coating, an inorganic pigment, an inorganic waterproofing agent, and an additive; And
It is applied on the intermediate coating, the phase comprising a fluorine silane, acid groups equivalent weight of 200 to 700 and acidic polymer of 5000 to 10000 and ester containing at least one ether group in the molecule in the intermediate coating Including a coating coating;
The sol-type filler constituting the coating for the undercoat includes any one or more of iron oxide, titanium dioxide, zinc oxide and alumina,
The additive constituting the intermediate coating agent includes a dispersant, an antifoaming agent, a pH adjusting agent and a thickener,
The intermediate inorganic waterproofing agent includes distilled water, potassium silicate, potassium silicate, silane and surfactant,
The coating coating for the top coat includes 10 to 20 parts by weight of fluorine silane, 40 to 60 parts by weight of acidic polymer, and 30 to 80 parts by weight of ester in addition to 500 to 600 parts by weight of the intermediate coating. Composition.

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