KR100947460B1 - Waterproofing method using polyurea and surfacepreparation compound - Google Patents

Abstract

PURPOSE: A waterproof coating method of a polyurea concrete structure is provided to reduce construction costs of a bottom layer a concrete structure, and to improve coating quality to the bottom layer. CONSTITUTION: A waterproof coating method of a polyurea concrete structure is as follows. A bottom layer(10) of a concrete structure is surface-treated. A primer layer(20) is formed on the surface-treated bottom layer. A painting layer(30) is formed on the primer layer. A coating layer(40) is formed by spraying a coating material, which has ultra rapid hardening polyurea resin, on the painting layer.

Description

Waterproof coating method for polyurea concrete structures {WATERPROOFING METHOD USING POLYUREA AND SURFACEPREPARATION COMPOUND}

The present invention relates to a waterproof coating method for a polyurea concrete structure, and more particularly, when a new construction or repair work is performed on a water purification plant, a drainage basin, or other floors of a concrete structure, The present invention relates to a waterproof coating method for a polyurea concrete structure that is waterproofed with a coating material having perfect adhesion even on a wet surface, in order to prevent lifting of the urea coating film.

In general, concrete has good compressive strength, and has good resistance to acid resistance, alkali resistance, chemical resistance, ultraviolet rays, etc., but the strength is lowered by materials containing impurities such as acid / alkali, organic matter, etc. Leakage occurs due to irregular cracks, poor work of joints, cracks caused by external forces, and when corrosion is intensified, even the reinforcing steel is corroded and the durability of the structure is severely degraded. There is a problem of damage.

Thus, conventionally, the anti-corrosion and chemical resistance by the waterproof / anticorrosive coating construction method to form a resilient and smooth coating film, by forming the embossing on the surface of the coating film by adjusting the spraying angle to prevent slipping and beautiful aesthetic function, reactivity and curing speed It is very fast and a coating method is applied to directly paint concrete of polyurea resin which is widely used for waterproof / corrosive purposes.

However, in the construction method of coating the polyurea resin directly on the concrete structure, there is a problem that pinholes are generated due to poor water tightness of the concrete and the surface is not flat.

Accordingly, conventionally, in order to overcome the problem of the generation of pinholes, the construction of the nonwoven fabric, the asphalt sheet pavement, and the urethane resin was inevitable before coating the polyurea resin.

However, the nonwoven fabric or asphalt sheet packaging method has a disadvantage in that the process is cumbersome and the surface of the nonwoven fabric is roughened due to the coating film provided on the nonwoven fabric, and the coating material is quickly absorbed into the nonwoven fabric and thus the workability is poor.

In addition, when the waterproofing / anticorrosive coating method is applied using the urethane resin as a backing material, a urethane resin having a low curing time is used as the backing material. The urethane resin is a polyol-based compound and an isocyanate. In general, the urethane resin has a slow curing time and has a self-leveling function. The self-leveling function is smooth because polyurethane has fluidity. One layer is to form a background adjustment material layer.

Accordingly, the method of using a urethane resin as a base adjustment material has the disadvantage that the urethane resin can not be painted when the construction surface is wet, and when the urethane resin is applied to the construction surface of the wet state, the waterproof / anticorrosive coating material is There is a problem that the coating material is lifted or cracks fall off the correspondence to the behavior of the base surface is not properly attached to the construction surface.

The present invention is to solve the conventional problems as described above, even if the bottom layer of the concrete structure is wet by allowing the coating layer to be completely adhered to the wet surface to be fixed, the bottom layer of the concrete structure during the new construction or renovation Compensate the background adjustment function such as repairing and filling of holes or recesses caused by pinhole or aggregate separation or cold joint, etc., which occur when concrete or concrete is being poured, thereby reducing the construction cost of the floor of the concrete structure. Of course, the object of the present invention is to provide a waterproof coating method of the polyurea concrete structure to provide a perfect coating quality for the bottom layer of the concrete structure.

That is, the present invention is excellent even in a condition that is less dry or difficult to structurally perfect construction in spite of the fact that the water content of the concrete matrix is usually dried to 8% or less when new construction or repair work for water purification plant or drainage or other concrete structures When the waterproof coating method of the bottom layer on the concrete structure of the polyurea having a physical property is performed, the coating work allows the coating material to be coated with perfect adhesion.

Waterproof coating method for the present invention polyurea concrete structure for achieving the above object, the first step of surface treatment of the bottom layer of the concrete structure; A second step of forming a primer layer on the entire bottom layer surface-treated from the first step; A third step of constructing a coating layer as a background adjustment material on the primer layer formed in the second step; And a fourth step of forming a coating layer by spraying a coating material including an ultra-fast curing polyurea resin on the coating layer formed in the third step. Proceeds.

According to another aspect of the present invention, the first step includes the steps of: removing latencies, pinholes in the bottom layer of the concrete structure using a waterjet and a power tool; Reinforcing cracks and leaks and water portions of the bottom layer of the concrete structure; And removing dust using a vacuum cleaner and dried high pressure air in the bottom layer so that primer penetration into the bottom layer of the concrete structure and adhesion to the base adjuster are easily performed. It includes.

According to another aspect of the invention, the primer layer is formed of a two-component water-soluble epoxy primer consisting of a polyamide resin of the main epoxy resin and a curing agent.

According to another aspect of the present invention, the two-component water-soluble epoxy primer is weighed in a mass ratio of 4: 1 to the main epoxy resin and the curing agent polyamide resin in a mixing vessel, and then stirred using an electric stirrer. ; And 15 to 20 parts by weight of water with respect to the stirred mixed solution is sufficiently remixed with an electric stirrer; It is formed from.

According to another aspect of the invention, the coating thickness of the primer layer according to the coating of the two-component water-soluble epoxy primer is in the range of 0.05 ~ 0.15mm.

According to another aspect of the present invention, the base material for constructing the coating layer in the third step is composed of a three-component type consisting of a water-soluble epoxy resin, a curing agent, and powder.

According to another aspect of the invention, the mixing ratio of the water-soluble epoxy resin, the curing agent and the powder forming the three-component base adjustment material is 1 part by weight of the water-soluble epoxy resin, 2.5 parts by weight of the curing agent to 8 parts by weight of the powder after mixing It is made by stirring sufficiently until the powder is completely released by a power stirrer to form a uniform liquid phase.

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According to another aspect of the invention, the coating layer is to be applied one or more times while maintaining a thickness of 0.5mm.

According to another aspect of the present invention, the three-component base adjustment material may contain an epoxy emulsion resin containing two epoxy groups in a molecule and forcibly emulsifying water with a solvent by adding a nonionic emulsifier. The water-soluble compound obtained by the reaction of a compound with an amine having at least one amine group may be used as a curing agent, and the powder may be 1 to 5 parts by weight of color pigments, 20 to 40 parts by weight of silica sand as a sieving pigment, 20 to 40 parts by weight of cement, etc. It can be comprised by the ratio of 1-5 weight part of additives (precipitation inhibitor etc.).

According to another aspect of the invention, the fourth step of the coating layer provides an ultra-fast curing polyurea resin in the form of a coating composition, wherein the polyurea resin is an isocyanate prepolymer as a component A and a curing agent which is a polyamine mixture is a B component It consists of a two-component coating material.

According to another aspect of the invention, the thickness of the coating layer is in the range of 1.5 ~ 2.0㎜, the hardness is measured by Shore A durometer should be 85 or more, the tensile strength is 200 ± 30kgf / ㎠, tear strength is 100 ± 15 kgf / cm, elongation is configured to have a characteristic of more than 300%.

The present invention prevents the occurrence of pinholes in the coating layer with a water-soluble epoxy cement system before forming the external exposed surface with a coating material containing a polyurea resin, which is an ultra-fast curing resin, even when the bottom layer of the concrete structure is wet, in the wet surface. The adhesive strength of the coating layer is maintained to be firmly maintained, thereby maximizing the stability and superiority as a waterproof / corrosive coating material for the bottom layer of the concrete structure, and the pinholes generated when the bottom layer of the concrete structure is not firm or newly poured during the construction or repair work. In addition, it supplements the background adjustment function, such as repairing and filling holes or hollow grooves generated by aggregate separation or cold joint, thereby reducing the construction cost of the floor layer of the concrete structure, and Perfect coating quality for my You can expect the effect.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

Figure 1 illustrates a coating state diagram for the bottom layer of the concrete structure in an embodiment of the present invention.

That is, in the waterproof coating method for the polyurea concrete structure according to the embodiment of the present invention, after the surface treatment of the bottom layer 10 in order, the primer layer 20, the coating layer 30, and the coating layer 40 Proceed to the first to fourth steps to form a.

The first step is to surface-treat the bottom layer 10 of the concrete structure, the surface treatment is to remove the latencies, pinholes and the like from the bottom layer 10 of the concrete structure using a waterjet and a power tool, Reinforced the cracks and leakage and water portion to the bottom layer 10, and the vacuum cleaner and dried in the bottom layer 10 to facilitate the penetration of the primer to the bottom layer 10 of the concrete structure and the adhesion to the base adjuster It is to remove dust by using high pressure air.

That is, in order to coat the bottom layer 10 of the concrete structure in a waterproof manner, first, other foreign substances such as oil, salinity, moisture, and dust on the surface of the bottom layer 10 should be removed. Remove with diluent.

The second step is to form a primer layer 20 on the entire surface of the bottom layer 10, the forming of the primer layer 20 is to fix the foreign substances present on the surface of the bottom layer 10 of the concrete structure It is to improve the adhesion with the coating layer 30 of the base adjustment material to be subsequently constructed by infiltrating the primer to the concrete pore site while preventing the concrete pores and strengthening the concrete.

At this time, the primer layer 20 uses a two-component water-soluble epoxy primer made of a main epoxy resin and a polyamide resin as a curing agent so that the coating is applied to the bottom layer 10 of the concrete structure surface-treated by roller or spray. will be. The two-component water-soluble epoxy primer was weighed into a mixing vessel by weighing a main epoxy resin and a polyamide resin as a curing agent at a mass ratio of 4: 1, followed by primary stirring using an electric stirrer, and then the mixed solution being stirred. 15 to 20 parts by weight of water (fresh water) is added to 100 parts by weight, which is made by sufficiently mixing with an electric stirrer, which is to be coated on the bottom layer 10.

Here, the stirring speed of the electric stirrer is to be uniformly mixed in the range of about 3 to 5 minutes in the range of RPM 500 ~ 1,000.

In addition, the pot life to maintain the fluidity suitable for use without the gelation, curing, etc. when the two-component water-soluble epoxy primer is mixed is most preferably 2 hours based on 25 ℃, which is shown in the table below As the temperature is higher it is to be shortened.

   Temperature    10 ℃     15 ℃     20 ℃     25 ℃     30 ℃      35 ℃   Housework time    6 hours    5 hours    2.5 hours    2 hours    1.5 hours    1 hours

At this time, since the pot life has elapsed, it is preferable to prohibit the use of the product as the viscosity increases and poor surface adhesion and poor adhesion occur during painting.

In addition, the coating thickness of the primer layer 20 according to the coating of the two-component water-soluble epoxy primer is preferably in the range of 0.05 ~ 0.15mm, which is very slow drying when the thickness at the time of single coating is 0.2mm or more 24 This is because the coating film slidability may occur even after elapse of time, and cracking may occur when overcoating to 0.3 mm or more.

That is, when painting the two-component water-soluble epoxy primer, a partial paint is applied with a tool such as a brush, and a partial or full surface is applied through a roller, and a spray pressure of 150-160Kg with a nozzle diameter of 0.43-0.53 mm. Through the airless spray having a front coating is to be made, the nozzle diameter and the injection pressure can be changed according to the working conditions.

At this time, by the method of forming the primer layer 20 through the coating of the two-component water-soluble epoxy primer, the first part of the coating layer is difficult to coat, and then the portion of the coating surface that is heavily absorbed during the first coating (the original color of the base appears) If the part appears entirely, apply one additional coat.

Next, in the case where the absorbent portion is small, after the partial repair coating with a brush or a roller, the entire coating on the bottom layer 10 may be performed.

The coating layer 30 of the third step is formed by constructing a base adjustment material on the primer layer 20, the base adjustment material to handle the normal pores, dents and the like on the surface of the bottom layer 10. It consists of a three-component type consisting of a water-soluble epoxy resin, a curing agent (cement), and a powder (silica sand).

At this time, the mixing ratio of the water-soluble epoxy resin, the curing agent (cement) and the powder (silica sand) constituting the three-component base adjustment material is measured by weight ratio, 1 part by weight of the water-soluble epoxy resin, 2.5 parts by weight of the curing agent to 8 parts by weight of powder After the injection into the power stirrer is completely stirred and the powder is made until it is made into a uniform liquid, the primer layer 20 formed on the bottom layer 10 of the concrete structure by plastering the mixed liquid through a tool such as trowel ) Is to install smoothly.

In other words, the mixing method of the three-component base adjustment material is to use a power stirrer, and the main body and the curing agent are uniformly mixed for about 3 to 5 minutes with a high speed stirrer with a RPM of 500 to 1,000 according to the indicated ratio. Put slowly and stir evenly.

Here, in the above mixing method, a diluent (water) is not necessary, because when the dilution is added, the film thickness becomes thin and in a closed space, a flow, crack, and hardening may be a factor.

At this time, the three-component base adjustment material is most preferably in the range of 45 to 60 minutes at room temperature to maintain the fluidity suitable for use without gelation, hardening, etc. when the mixing is made, which is described below As shown in the table, the higher the temperature, the shorter it was.

  Temperature    10 ℃    15 ℃    20 ℃    25 ℃    30 ℃    35 ℃    40 ℃  Housework time    70 minutes    60 minutes    50 minutes    40 minutes    25 minutes    20 minutes    15 minutes

Here, the pot life has elapsed, the viscosity is increased, it is preferable not to use because the surface defects and poor adhesion occurs during coating.

On the other hand, when the coating layer 30 is formed by coating the three-component base adjustment material, which is mixed as described above, the thickness is 0.5 mm to 1.0 mm and can be applied one or more times. And subsequent processes are possible.

That is, when painting the background adjustment material, first, after performing a partial repair to smoothly process the pin hole and the bubble generated when the primer layer 20 is formed, the hand tool is used. To remove contaminants.

Next, the coating layer 30 is formed by coating the entire upper portion of the primer layer 20 with a three-component base adjustment material.

Here, the three-component base adjuster may include an epoxy emulsion resin containing two epoxy groups in a molecule and forcibly emulsifying water with a solvent by adding a nonionic emulsifier, and a polyalkyl oxide compound and an amine having at least one amine group. The water-soluble compound obtained by the reaction with may be used as a curing agent, and the powder may be 1 to 5 parts by weight of color pigment, 20 to 40 parts by weight of silica sand as a extender pigment, 20 to 40 parts by weight of cement, and other additives (precipitation inhibitor, etc.) It can also be comprised by the ratio of 1-5 weight part.

On the other hand, forming the coating layer 40 of the fourth step is achieved by injecting a coating material containing an ultra-fast curing polyurea resin on the coating layer 30 formed in the third step.

That is, the coating layer 40 is to provide an ultra-fast curing polyurea resin in the form of a coating film composition, wherein the polyurea resin is a two-component coating material comprising a isocyanate prepolymer as an A component and a curing agent as a B component as a polyamine mixture. Coating treatment.

Here, the use of the polyurea resin is an ultra-fast curing type resin, the high temperature and high pressure spray coating film can be dried within a few seconds, so that it is possible to walk within 5 minutes after construction, and the curing performance is excellent even at low temperature without being affected by temperature and humidity. This is because the workability is remarkably improved, and by applying an embossing effect to the surface of the coating layer 30 by adjusting the spray angle when spraying is applied, sliding resistance and friction noise can be minimized.

At this time, the two-component coating material is preferably installed on the coating layer 30 through a spray gun using a dedicated equipment, the thickness is in the range of 1.5㎜ ~ 2.0㎜, the hardness is measured by Shore A durometer It should be 85 or more, tensile strength of 200 ± 30kgf / ㎠, tear strength is 100 ± 15kgf / ㎝, elongation is preferably configured to have a characteristic of 300% or more.

In more detail, first check that the primer layer 20 and the coating layer 30 is completely cured, and then check the spray equipment.

Here, to confirm that the primer layer 20 and the coating layer 30 is completely cured, it is to increase the adhesion of the coating material to the primer layer 20 and the coating layer 30.

At this time, the coating work of the coating material must be performed at the dew point temperature or higher, and if there is moisture on the surface, it must be performed after removing moisture completely.

Next, after the main body and the curing agent constituting the two-component coating material is precisely fastened to the supply line, the air compressor is operated to spray the coating material onto the coating layer 30.

At this time, the coating pressure according to the coating of the coating material is adjusted to 105 ~ 155kg _f / ㎠, while maintaining the discharge pressure of the two-component coating material and the discharge pressure of the curing agent to be the same, so that the coating construction is made Check the equipment if there is a difference of more than 10㎏ _f / ㎠ by the pressure of spraying hardener.

Next, the coating layer 40 is formed by spraying at intervals of several seconds to obtain a desired thickness while allowing a thickness within a range of 0.1 mm to 0.2 mm to be obtained through one spraying operation.

In this case, the thickness of 1mm or more at a time is to be careful because the swelling of the coating material may occur.

According to the present invention, the surface of the concrete structure bottom layer 10 is surface treated before forming the coating layer 40 including the polyurea resin, which is a super fast curing resin, and then the primer layer 20 and the coating layer 30 are sequentially formed thereon. It is formed in the state, which not only prevents the occurrence of pinholes, but also prevents the adhesive performance from deteriorating even when the bottom layer 10 of the concrete structure is wet, and thus waterproofing the bottom layer 10 of the concrete structure. / Anticorrosive coating to maximize the stability and excellence.

Hereinafter, the present invention is not limited to the above specific preferred embodiments, and various modifications can be made by those skilled in the art without departing from the gist of the present invention as claimed in the claims. Of course, such changes are within the scope of the claims.

1 is a coating state of the bottom layer of the concrete structure in an embodiment of the present invention.

* Description of the symbols for the main parts of the drawings *

10; Floor

20; Primer layer

30; Coating layer

40; Coating layer

Claims (11)

A first step of surface treating the bottom layer of the concrete structure; A second step of forming a primer layer on the entire bottom layer surface-treated from the first step; A third step of constructing a coating layer as a background adjustment material on the primer layer formed in the second step; And, A fourth step of forming a coating layer by spraying a coating material including an ultra-fast curing polyurea resin on the coating layer formed in the third step; Including but not limited to: The base adjusting material for constructing the coating layer in the third step is composed of a three-component type consisting of a water-soluble epoxy resin, a curing agent, and powder; The mixing ratio of the water-soluble epoxy resin, the curing agent, and the powder forming the three-component base adjustment material is 1 part by weight of the water-soluble epoxy resin and 2.5 parts by weight of the curing agent to 8 parts by weight of the powder in a mixing vessel, and then the powder is completely unwound with a power stirrer. Waterproof coating method for a polyurea concrete structure, characterized in that the mixture is sufficiently stirred until the liquid phase. The method of claim 1, wherein the first step, Removing latencies, pinholes, using waterjet and power tools in the bottom layer of the concrete structure; Reinforcing cracks and leaks and water portions of the bottom layer of the concrete structure; And, Removing dust using a vacuum cleaner and dried high pressure air in the bottom layer so that primer penetration into the bottom layer of the concrete structure and adhesion to the base adjuster are easily performed; Waterproof coating method for a polyurea concrete structure, characterized in that further comprising. The method of claim 1, wherein the primer layer is formed of a two-component water-soluble epoxy primer consisting of a main epoxy resin and a polyamide resin as a curing agent. The method of claim 3, wherein the two-component water-soluble epoxy primer, Weighing the epoxy resin as a main material and the polyamide resin as a curing agent at a mass ratio of 4: 1 to the mixing vessel, followed by stirring using an electric stirrer; And, Adding 15 to 20 parts by weight of water with respect to 100 parts by weight of the stirred mixed solution and sufficiently remixing with an electric stirrer; Waterproof coating method for a polyurea concrete structure, characterized in that formed from. The method of claim 3, wherein the coating thickness of the primer layer according to the coating of the two-component water-soluble epoxy primer is in the range of 0.05 ~ 0.15mm waterproof coating method for the polyurea concrete structure. delete delete The method of claim 1, wherein the coating layer is a waterproof coating method for the polyurea concrete structure, characterized in that the coating is applied at least once maintaining a thickness of 0.5mm. delete The method of claim 1, wherein the coating layer of the fourth step provides an ultra-fast curing polyurea resin in the form of a coating film composition, wherein the polyurea resin has an isocyanate prepolymer as an A component and a curing agent which is a polyamine mixture as a B component. Waterproof coating method for a polyurea concrete structure, characterized in that consisting of a liquid coating material. 11. The method of claim 10, wherein the thickness of the coating layer is in the range of 1.5 ~ 2.0㎜, the hardness is measured by Shore A durometer should be 85 or more, the tensile strength is 200 ± 30kgf / ㎠, tear strength is 100 ± 15kgf / ㎝, and the elongation is waterproof coating method for the polyurea concrete structure, characterized in that configured to have a characteristic of 300% or more.

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