KR100938923B1 - Urethane composition for forming a waterproof layer, complex waterproof structure for reinforcing a wall of building and complex waterproof process using the same - Google Patents

Abstract

Disclosed is a urethane composition for a waterproof coating film suitable for use in repair waterproof construction of buildings, composite waterproof structure and composite waterproof construction method for building repair using the same. The urethane composition for waterproofing coating film includes a main body including an isocyanate compound and a curing agent including a reactive polyol, a filler, and an antifoaming agent in a weight ratio of 1: 4 to 1: 6. According to the composite waterproof structure comprising a waterproof coating film formed by using the waterproof coating urethane composition, it is double waterproof by the configuration of the waterproof sheet and the urethane waterproof coating film, the use of the waterproof sheet to prevent cracking and movement of the building Damage to the waterproof layer and loss of the waterproof effect can be reduced, and industrial waste can be minimized without being bound by the old film.

Description

Urethane composition for forming a waterproof layer, complex waterproof structure for reinforcing a wall of building and complex waterproof process using the same}

The present invention relates to a urethane composition for waterproof coating, a composite waterproof structure for building repair using the same and a composite waterproof construction method. More particularly, the present invention relates to a urethane composition for a waterproof coating film having excellent waterproofness and construction efficiency for forming an exposure waterproof coating film during repair work due to aging of a building, and a composite waterproof structure and a composite waterproof construction method for building repair using the same.

In general, in the civil construction field, waterproofing is essentially performed on roofs, basement floors, and exterior walls of buildings to prevent aging and leakage of buildings. In case of new buildings, non-exposure waterproofing is mainly performed. Waterproofing works include sheet waterproofing, which mainly uses asphalt, modified asphalt, rubber or modified rubber, and tar urethane, tar-free urethane, inorganic or rubber modification. The liquid waterproofing method made of the material is mainly applied.

The sheet waterproofing method is a method of attaching a waterproof sheet on concrete treated with asphalt primer, and the joint portion where the waterproof sheet and the waterproof sheet overlap by melting using a torch lamp or the like to prevent water from penetrating. The waterproof sheet has a property that the waterproof layer does not split, but in particular, the joint is heated by melting with a torch lamp to attach it, thereby causing a delay in the process, and the waterproof sheet is overheated so that a hole or a torch lamp is observed. The parts that are not properly heated are not melted, so that the joints are not uniformly attached and are frequently lifted, causing water leakage.

The liquid waterproofing method is cheap and easy to construct by applying cement mortar to which the waterproofing agent is added to the waterproofing site, but has a disadvantage in that cracks easily occur in the waterproofing layer and frequent maintenance work is required.

On the other hand, in the case of aging buildings, it is constructed with exposed waterproofing, and coating film waterproofing using liquid coating waterproofing material mainly using polyurethane or acrylic rubber is mainly used. The coating film waterproofing method is to form a coating film by applying a plurality of layers of the liquid coating film waterproofing material on the structure after the first primer treatment on the surface using the liquid coating film waterproofing material, to form a seamless waterproof coating film. have.

However, it takes not only a long time to apply the liquid coating waterproofing material in several layers, but also requires a curing time of about 24 hours or more per layer of coating, and thus has a long construction period. In particular, the coating film should be removed before the waterproofing operation, and the removed coating film serves as industrial waste. In addition, the moisture contained in the building structure itself due to the evaporation of moisture contained in the structure bubbles caused by the bend in the waterproof coating film becomes uneven or the waterproof coating itself is lifted off from the structure there is a disadvantage. .

Therefore, in recent years, for the waterproofing of the aged building, a composite waterproofing method combining the advantages and combining the advantages of the sheet waterproofing method and the coating film waterproofing method has been introduced. Briefly describing the composite waterproofing method, as shown in FIG. 1, the first waterproofing coating 5 is applied to the waterproofing region from which the old film is removed, and the first waterproofing coating 5 is coated on the concrete layer 1. A plurality of waterproof sheets 3 are attached to them. Next, a liquid second waterproof coating 7 is applied onto the attached waterproof sheet 3. This waterproof method is not easy to form because the attachment of the waterproof sheet (3) and the first and second waterproof coating films (5, 7) must be applied separately, the formation of the waterproof coating film is long, and due to the removal of the old coating film There is a problem that a large amount of waste is generated.

Accordingly, an object of the present invention for solving the above problems is to provide a waterproof coating film urethane composition excellent in the workability of the waterproof coating, excellent waterproofing and adhesion to the structure.

Another object of the present invention is to reduce the industrial waste, to provide a composite waterproof structure for building repair excellent waterproof construction.

Still another object of the present invention is to provide a composite waterproof method for forming the composite waterproof structure for building repair.

Urethane composition for waterproof coating according to an embodiment of the present invention for achieving the above object is a weight of 1: 4 to 1: 6 of the main body containing an isocyanate compound, and a curing agent containing a reactive polyol, a filler, an antifoaming agent. It is formed by mixing in proportions.

According to embodiments of the present invention, the waterproof coating urethane composition is 18 to 25% by weight of isocyanate compound, 20 to 30% by weight of polyol having a trifunctional group, 1 to 10% by weight of polyether polyol, and 1 to 5% of modified polyol. %, Filler 30-50 wt% and antifoam 0.1-0.5 wt%.

In addition, the composite waterproof structure for building repair according to an embodiment of the present invention for achieving the above-mentioned another object is a lower sheet including asphalt, improved asphalt, rubber modified asphalt, modified rubber or a mixture thereof, and the lower sheet And a waterproof sheet having a top sheet comprising a nonwoven fabric thereon. A first waterproof coating film formed on the waterproof sheet using a urethane composition for waterproof coating comprising a main component including an isocyanate compound and a curing agent including a reactive polyol, a filler, and an antifoaming agent at a weight ratio of 1: 4 to 1: 6. It includes. And a second waterproof coating film formed on the first waterproof coating film by using the intermediate liquid urethane waterproofing material. And a third waterproof coating film formed on the second waterproof coating film by using a liquid urethane waterproofing material for top coat.

According to one embodiment of the present invention, the thickness of the lower sheet of the waterproof sheet may be 1 to 3mm, the thickness of the upper sheet may be 0.01 to 1mm.

According to an embodiment of the present invention, fixing holes through which fixing members for fixing the waterproof sheet on the concrete layer are formed at edge portions of the waterproof sheet.

According to an embodiment of the present invention, the first waterproof coating film may have a density of about 0.5 to 1.4 kg / m ² and a thickness of about 0.3 to 1.0 mm.

Composite waterproofing method according to an embodiment of the present invention for achieving the above-mentioned another object is a lower sheet including asphalt, improved asphalt, rubber modified asphalt or a mixture thereof on the coating film forming region to form a waterproof coating film; And a waterproof sheet in which a top sheet including a nonwoven fabric is sequentially laminated. The first waterproof coating film is formed by using a urethane composition for a waterproof coating film including a main body including an isocyanate compound and a curing agent including a reactive polyol, a filler, and an antifoaming agent at a weight ratio of 1: 4 to 1: 6 on the waterproof sheet. Form. The second waterproof coating film is coated on the first waterproof coating film by using the intermediate liquid urethane waterproofing material. The third waterproof coating film is coated on the second waterproof coating film by using a liquid urethane waterproofing material for top coat.

According to one embodiment of the invention, the waterproof sheet is attached to the concrete layer by partially providing an adhesive on the edge portion of the waterproof sheet.

According to the present invention, since the waterproof coating using the urethane composition for waterproof coating is applied on the waterproof sheet fixed on the concrete layer, a process of completely removing the existing old coating is not required before performing the repair waterproofing. In addition, since the waterproofing operation is performed using the sheet insulated, the problem that bubbles in the waterproof coating may be solved by moisture in the concrete layer that is in close contact with the liquid waterproofing method alone. Therefore, the time and material cost required to remove the old film can be saved, and the construction period can be shortened, and damage to the waterproof structure due to cracks and movements of buildings and degradation of waterproof performance can be reduced.

According to the urethane composition for waterproof coating film of the present invention as described above, the composite waterproof structure and composite waterproof construction method for building repair using the same, the waterproof coating film is applied on the waterproof sheet fixed on the concrete layer prior to performing the repair waterproof construction It is not necessary to carry out the process of completely removing the old film. Therefore, the generation of industrial waste generated when the old film is removed can be minimized, and the construction period can be shortened by saving the time and material costs required to remove the old film.

In addition, the waterproof operation is performed by the insulating method using the sheet rather than the contact method using a liquid waterproof material, it is possible to block the problem that the air bubbles in the waterproof coating due to the moisture in the concrete layer adhered during the conventional waterproof method. In addition, damage to the waterproof structure due to cracks and movements of buildings and degradation of waterproof performance may be reduced.

Hereinafter, the urethane composition for waterproof coating according to embodiments of the present invention, a composite waterproof structure for building repair using the same and a composite waterproofing method will be described in detail with reference to the accompanying drawings, but the present invention is limited to the following embodiments. Those skilled in the art will appreciate that the present invention may be embodied in various other forms without departing from the spirit of the invention. That is, specific structural to functional descriptions are merely illustrated for the purpose of describing embodiments of the present invention, and the embodiments of the present invention may be embodied in various forms and should be construed as being limited to the embodiments described herein. Is not. It is not to be limited by the embodiments described in the text, it should be understood to include all changes, equivalents, and substitutes included in the spirit and scope of the present invention.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, the terms "comprise" or "include" are intended to indicate that there is a feature, number, step, action, component, or combination thereof described, and one or more other features or numbers, It will be understood that it does not exclude in advance the possibility of the presence or addition of steps, actions, components, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art. Terms such as those defined in the commonly used dictionaries are to be interpreted as having meanings consistent with the meanings in the context of the related art, and are not construed in ideal or excessively formal meanings unless expressly defined in this application. .

Urethane Composition For Waterproof Coating

Hereinafter, the urethane composition for waterproof coating films of the present invention will be described in detail.

The urethane composition for waterproof coating film of the present invention can be prepared to have two compositions: a main body containing an isocyanate compound and a curing agent consisting of a reactive polyol, a filler, and an antifoaming agent. Specifically, the urethane composition for waterproofing coating film of the present invention is formed by mixing a main ingredient including an isocyanate compound and the curing agent in a weight ratio of about 1: 4 to about 1: 6. In addition, the urethane composition for waterproofing coating film is about 18% to about 25% by weight of the main body including an isocyanate compound, about 20% to about 30% by weight of a polyol having a trifunctional group as a curing agent, and about 1% by weight of a polyether polyol To about 10 wt%, modified polyol about 1 wt% to about 5 wt%, about 30 wt% to about 50 wt% filler and about 0.1 wt% to about 0.5 wt% defoamer. At this time, the isocyanate group in the isocyanate compound has a weight ratio in the range of about 25% by weight to about 40% by weight. In addition, the equivalent ratio of the hydroxy group and the isocyanate group in the urethane composition for waterproofing coating film is preferably about 1: 1.0 to about 1: 1.3.

First, the main ingredient including an isocyanate compound of the urethane composition for waterproof coating according to the present invention has an isocyanate group (-NCO), and the isocyanate group reacts with the hydroxyl group (-OH) of the polyol to form a urethane resin. When the content of the isocyanate compound is less than 18% by weight based on the total weight of the urethane composition for waterproofing coating film, the hydroxyl group (-OH) of the components of the waterproofing coating urethane composition remains, so that hardness, strength may be reduced, and stickiness may occur. When it exceeds 25% by weight, isocyanate groups (-NCO) remain, which may cause foaming, cracking of the coating film, etc., due to bonding with moisture, which is not preferable. Therefore, the amount of the compound containing the isocyanate preferably has about 18% to about 25% by weight relative to the total weight of the urethane composition for waterproof coating.

Examples of the compound containing the isocyanate include toluene diisocyanate, isophorone diisocyanate, 1,6-hexamethylene diisocyanate, tetramethylxylene diisocyanate, hydrogenated diphenylmethane diisocyanate, and the like. May be used or mixed. As a specific example of the compound containing the isocyanate used in the present invention, Dow Chemical's PAPI-135K (Cured MDI) (product name) may be mentioned.

Among the curing agents, the reactive polyols include polyether polyols, polyester polyols, polycaprolactone polyols, polytetramethylene ether diols, low molecular weight alcohols, and the like, and these may be used alone or in combination. For example, the valent reactive polyol may use at least one of polyether polyol, polytetramethylene polyol, and low molecular weight alcohols.

In embodiments of the invention, the reactive polyol comprises about 20% to about 30% by weight of a polyol having a trifunctional group, about 1% to about 10% by weight of a polyether polyol and about 1% to about 5% of a modified polyol. It may include weight percent.

The polyol having the trifunctional group is used to improve the toughness of the coating film, and when the content of the polyol having the trifunctional group is less than about 20% by weight based on the total weight of the urethane composition for waterproofing coating, the hardness of the waterproofing coating urethane composition May be weakened, and if it exceeds about 30% by weight, impact stability and tear strength are weakened, which is not preferable. Accordingly, the amount of the polyol having the trifunctional group is preferably about 20% to about 30% by weight based on the total weight of the urethane composition for waterproofing coating. As the polyol having a trifunctional group, castor oil, GP-250 (trifunctional propylene-based polyether polyol, KPX Chemical Co., Korea) and the like can be used.

The polyether polyol may use a weight average molecular weight of about 1,000 to about 4,000. When the weight average molecular weight of the polyether polyol is less than about 1,000, the weight average molecular weight may be excessively lowered, thereby lowering flexibility, and when it exceeds about 4,000, hardness and wear resistance of the coating may be lowered. When the content of the polyether polyol is less than about 1% by weight based on the total weight of the urethane composition for waterproofing coating, the hardness of the waterproofing coating urethane composition may be increased more than necessary to weaken impact resistance, and about 10% by weight If exceeded, the hardness is low and flexible, which is not preferable. Therefore, the amount of the polyether polyol used preferably has about 1% to about 10% by weight relative to the total weight of the urethane composition for waterproof coating.

The modified polyol is used for the purpose of reinforcing strength, improving chemical resistance and foaming stability, and when the content of the modified polyol is less than about 1% by weight based on the total weight of the urethane composition for waterproofing coating, the waterproofing coating urethane The composition may be foamed because it is sensitive to humidity, and when it exceeds about 5% by weight, the hardness may be increased and the impact resistance may be weakened, which is not preferable. Therefore, the amount of the modified polyol is preferably about 1% to about 5% by weight relative to the total weight of the urethane composition for waterproof coating. Examples of the modified polyols include xylene-modified polyols and NIKANOL K-140.

In addition, in order to increase the coating film strength when forming the waterproof coating film, the filler preferably has a range of about 30% by weight to about 50% by weight relative to the total weight of the urethane composition for waterproof coating. This is because the strength of the coating film formed when the content of the filler exceeds the above range is increased, but the problem of sedimentation during commercial use of the urethane composition occurs. An example of the filler may be calcium carbonate (CaCO ₃ ).

Subsequently, the urethane composition for waterproofing coating film further includes an antifoaming agent. The antifoaming agent preferably contains about 0.1% by weight to about 0.5% by weight relative to the total weight of the waterproofing urethane composition.

In addition, the additives used in the existing urethane composition for waterproof coating may be additionally used for the waterproof coating urethane composition. That is, in general, the use of the additive is not limited because it is added in a very small amount in order to optimize the elements that have a slight influence on the manufacturability and the workability in the coating film. As an example of the said additive, a pigment, a plasticizer, a moisture absorbent, etc. are mentioned. Since the amount of the additive varies depending on the type of the additive, the amount of the additive in the present embodiment is not a limiting factor of the present invention.

Complex waterproof structure for building repair

2 is a cross-sectional view showing a composite waterproof structure for building repairs according to an embodiment of the present invention.

Referring to FIG. 2, an old concrete layer 100 having a non-uniform surface is attached to a concrete layer 100 in which a building is aging and a waterproofing operation is to be performed through changes in shrinkage, expansion, or the like. Double waterproof sheet 108 comprising an upper sheet 106 including a non-woven fabric and a lower sheet 104 including asphalt, improved asphalt, rubber-modified asphalt, modified rubber or mixtures thereof on the upper surface of the old film layer 102. ) Is applied. The waterproof sheet 108 is not in close contact with the front surface of the coating layer 102, but is fixed to the concrete layer 100 through a fixing member 110 provided at an edge portion.

In particular, the upper sheet 106 of the waterproof sheet 108 is provided with a nonwoven sheet. The nonwoven fabric sheet is for easy application of the waterproofing coating urethane composition of the present invention, and also serves to prevent the waterproofing coating urethane composition from randomly moving on the upper surface of the nonwoven fabric sheet. The nonwoven sheet is formed in a shape and size corresponding to the upper surface of the lower sheet 104, and is fixed by heat fusion in the process of forming the lower sheet 104. In this case, the lower sheet 104 of the waterproof sheet 108 may have a thickness of about 1 mm to about 3 mm, and the upper sheet 106 may have a thickness of about 0.01 mm to about 1 mm.

A space 103 is formed between the waterproof sheet 108 and the composition layer 102. The space 103 is a gap formed because the surface is not in close contact with the non-uniform composition layer 102 and serves as a passage through which air existing between the waterproof sheet 108 and the composition layer 102 is exhausted to the outside. . Therefore, the moisture in the concrete layer 100 and the moisture in the old film layer 102 may be discharged to the outside through the space 103. Therefore, compared to the case where the waterproofing method of closely contacting the concrete layer 100 using the existing liquid waterproofing material is used, it is possible to prevent a problem in which bubbles are generated in the waterproof coating film due to moisture in the concrete layer 100.

The waterproof sheet 108 is formed with a plurality of fixing holes (not shown) at constant edges while maintaining a constant interval. Holes for fitting the fixing members are also formed in the exposed portions of the old film layer 102 and the concrete layer 100 that the bottom of the fixing holes abut. Fixing members 106, such as screws, may pass through the fixing holes and holes formed in the waterproof sheet 108, the old film layer 102, and the concrete layer 100, thereby forming the waterproof sheet 108 in the concrete layer 100. Can be fixed at Therefore, the old coating layer 102 under the waterproof sheet 108 does not need a separate removal process, it is possible to minimize the industrial waste caused by the removal of the old coating layer 102, to remove the old coating layer 102 The costs of doing so can be saved. As another example, the waterproof sheet 108 may be attached to the concrete layer 100 by partially providing an adhesive to the edge portion of the waterproof sheet 108.

The first waterproof coating film 112 is provided on the waterproof sheet 108. The first waterproof coating 112 may be formed by applying the urethane composition for waterproof coating of the present invention. The urethane composition for waterproofing coating film is formed by mixing a main body containing an isocyanate mixture with a curing agent composed of a reactive polyol, a filler, and an antifoaming agent. Specifically, the urethane composition for waterproofing coating film of the present invention is formed by mixing the main agent and the curing agent containing the isocyanate compound in a weight ratio of about 1: 4 to about 1: 6. In addition, the urethane composition for waterproof coating film is about 18% to about 25% by weight of isocyanate compound, about 20% to about 30% by weight of polyol having a trifunctional group as a curing agent, about 1% to about 10% by weight of polyether polyol %, About 1% to about 5% by weight of modified polyol, about 30% to about 50% by weight filler and about 0.1% to about 0.5% by weight of antifoaming agent. At this time, the isocyanate group in the isocyanate compound has a weight ratio in the range of about 25% by weight to about 40% by weight. In addition, the equivalent ratio of the hydroxy group and the isocyanate group in the urethane composition for waterproofing coating film is preferably about 1: 1.0 to about 1: 1.3. Urethane composition for waterproof coating and the elements constituting the same of the present invention have been described in detail in the above-mentioned urethane composition for waterproof coating is omitted in order to avoid duplication.

The first waterproof coating film 112 is formed by applying the urethane composition for waterproof coating film to have a density of about 0.5 kg / m ² to about 1.4 kg / m ² on the waterproof sheet 108, the first waterproof coating film ( 112) has a thickness of about 0.3 mm to about 1.0 mm.

On the upper surface of the first waterproof coating film 112, a second waterproof coating film 114 using a middle waterproof material is attached to protect the coating film of the first waterproof coating film 112 to maintain a waterproof function. As the intermediate waterproofing material, a liquid urethane waterproofing material for a moderate degree may be used.

On the upper surface of the second waterproof coating film 114, in order to prevent weather shortening of the urethane coating film by ultraviolet rays and to improve weather resistance such as reducing deformation due to acid rain, a third waterproof coating film 116 using a top coat waterproofing material is attached. do. As the top coat waterproofing material, a liquid urethane sealant for top coat may be used. In this case, the top coat waterproof material may be applied by using a roller or a spray gun, or may be formed by coating after silica sand spraying.

In the above-described building repair composite waterproof structure, the waterproof sheet is first positioned on the concrete layer, and the waterproof sheet, the first waterproof coating film, the second waterproof coating film, and the third waterproof coating film are laminated on the concrete layer.

According to the building waterproof composite waterproof structure as described above, since the waterproof coating is applied on the waterproof sheet fixed on the concrete layer, it is not necessary to perform a process of completely removing the existing old film before performing the repair waterproof construction. Therefore, the generation of industrial waste generated when the old film is removed can be minimized, and the construction period can be shortened by saving the time and material costs required to remove the old film. In addition, the waterproof operation is performed by the insulating method using the sheet rather than the contact method using a liquid waterproof material, it is possible to block the problem that the air bubbles in the waterproof coating due to the moisture in the concrete layer adhered during the conventional waterproof method. In addition, damage to the waterproof structure due to cracks and movements of buildings and degradation of waterproof performance may be reduced.

Composite waterproofing

3 is a process flow diagram illustrating a composite waterproof construction method for building repairs according to an embodiment of the present invention.

The composite waterproofing method of the present invention shown in Figure 3, first removes the dust on the old coating film on the concrete layer prior to the repair work, and the waterproof sheet on the old film on the coating film forming area to form a new waterproof coating film Attach (S10).

Here, the coating film forming area is an area to which the waterproof sheet is applied, and includes an roof of an apartment, an upper slab of an underground parking lot, an outer wall such as a roof of various buildings, a building structure with high vibration and cracks, a rooftop with many protruding parts, and the like.

The waterproof sheet forms a lower sheet made of asphalt, improved asphalt, rubber-modified asphalt, modified rubber or a mixture thereof, and forms a top sheet made of nonwoven fabric on the lower sheet, and then heat-sealed. The nonwoven fabric is impregnated to the surface of the lower sheet.

Specifically, the waterproof sheet is attached to the concrete layer, which is a coating film forming region, is laminated to have a predetermined thickness. Here, the lower sheet of the waterproof sheet is formed to a thickness of about 1mm to about 3mm, the upper sheet is formed to a thickness of about 0.01mm to about 1mm.

In this case, the waterproof sheet may be dried for a predetermined time to cure the waterproof sheet.

Subsequently, fixing holes are formed in edge portions of the waterproof sheet, and holes are formed in the upper surface of the old film and the concrete layer of the portions exposed to the fixing holes, and then penetrate the fixing members in the fixing holes and holes. The waterproof sheet is fixed to the concrete layer (S11). In this case, the fixing holes are spaced apart from each other by a predetermined distance, and the fixing member may use a screw.

According to the embodiments of the present invention, an adhesive may be partially provided to an edge portion of the waterproof sheet to attach to the concrete layer.

As described above, the waterproof sheet composed of the upper sheet and the lower sheet may be easily attached to the concrete layer having a non-uniform surface by using the fixing member, and the old film may not be removed before the sheet is attached. In addition, it is possible to release the moisture contained in the concrete layer by performing a waterproof construction by the insulating method using a sheet rather than in close contact with the concrete layer can be applied so that the water-resistant coating film formed on the top of the bubble does not occur.

Subsequently, a first waterproof coating film is coated on the waterproof sheet (S12). The first waterproof coating film may be formed by applying the urethane composition for waterproof coating film of the present invention. The urethane composition for waterproofing coating films of this invention is formed by mixing the main body containing an isocyanate compound, and the hardening | curing agent which consists of a reactive polyol, a filler, and an antifoamer. Specifically, it is formed by mixing the main agent and the curing agent containing the isocyanate compound in a weight ratio of about 1: 4 to about 1: 6. In addition, the urethane composition for waterproof coating film is about 18% to about 25% by weight of the isocyanate compound, about 20% to about 30% by weight of a polyol having a trifunctional group, about 1% to about 10% by weight of a polyether polyol, And about 1% to about 5% by weight of a modified polyol, about 30% to about 50% by weight filler, and about 0.1% to about 0.5% by weight of an antifoaming agent. At this time, the isocyanate group in the isocyanate compound has a weight ratio in the range of about 25% by weight to about 40% by weight. Urethane composition for waterproof coating and the elements constituting the same of the present invention have been described in detail in the above-mentioned urethane composition for waterproof coating is omitted in order to avoid duplication.

Specifically, the first waterproof coating film is applied to the waterproof coating film urethane composition having a density of about 0.5 kg / m ² to about 1.4 kg / m ² on the waterproof sheet, the coating process is a roller, brush or Can be carried out as a private waste. In this case, the first waterproof coating film is preferably applied uniformly while maintaining the viscosity that bubbles are not generated, the thickness may be formed about 0.3mm to about 1.0mm.

After applying the first waterproof coating film, the first waterproof coating film is dried for a predetermined time to cure the first waterproof coating film.

Subsequently, a liquid urethane waterproofing material is coated on the first waterproofing coating film to form a second waterproofing coating film (S13). The second waterproof coating film serves as an intermediate coating film to improve the waterproof function of the first waterproof coating film.

Subsequently, a liquid urethane waterproofing material is coated on the second waterproofing coating film to form a third waterproofing coating film (S14). The third waterproof coating film serves as a top coat film to prevent shortening of the life of the urethane coating film due to ultraviolet rays and acid rain.

As the liquid urethane waterproofing material, a waterproofing material containing elastic urethane as a main raw material is used, and in the present invention, the product names Crytan 2100, Crytan 3000S, etc. of Deepia Holdings Co., Ltd. are used.

The composite waterproof structure formed by the above-described composite waterproofing method can be expected to have a double waterproof effect because the waterproofing sheet layer and the urethane waterproof layer is laminated. In addition, the use of sheet waterproofing can prevent the problem that bubbles are formed in the waterproof coating due to moisture in the concrete layer adhered to the existing waterproofing of the existing polyurethane film, and after fixing the sheet layer on the concrete layer, By applying the coating can be greatly reduced the damage of the waterproof coating due to cracks and movement of the lower structure and thereby the waterproofing problem. In addition, it is not necessary to remove the old film completely before applying the waterproof sheet can reduce the old film cleaning process, it is possible to minimize the industrial waste can reduce the environmental pollution.

Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples. However, the following examples are provided to illustrate the present invention, and the present invention is not limited to the following examples and may be variously modified and changed.

Manufacture urethane composition for waterproof coating

Synthesis Example 1

20 parts by weight of a main ingredient including isocyanate (PAPI-135K (Cured MDI), Dow Chemical, Korea) and 25 parts by weight of polyol (caster oil, Philippine acid) having a trifunctional group as a curing agent, polyether polyol (GP) -3000, POLYOL Korea, Korea) 6 parts by weight, 3.5 parts by weight of zircon-modified polyol (NIKANOL K-140, Mitsubishi Gas, Japan), filler containing calcium carbonate (NAC-600, Woojin Chemical, Korea) 45 parts by weight, antifoaming agent (LUCANT HC-100, Mitsui Chemical Co., Japan) 0.5 parts by weight was added and stirred in a high-speed disperser to prepare a urethane composition for waterproof coating.

Synthesis Example  2

20 parts by weight of the main ingredient including isocyanate (PAPI-135K (Cured MDI), Dow Chemical, Korea) and 27 parts by weight of a polyol (caster oil, Philippine acid) having a trifunctional group as a curing agent, a polyether polyol having a molecular weight of about 3,000 ( GP-3000, POLYOL Korea, Korea) 7.5 parts by weight, filler containing calcium carbonate (NAC-600, Woojin Chemical, Korea) 45 parts by weight, antifoaming agent (LUCANT HC-100, Mitsui Chemical, Japan) 0.5 The weight part was added and stirred in a high speed disperser to prepare a urethane composition for waterproof coating.

Example  One

2 mm thick asphalt sheet and a non-woven fabric sheet having a thickness of 0.05 mm are laminated on the concrete, and a thickness of 0.5 mm is obtained by using the urethane composition for waterproof coating film prepared in Synthesis Example 1 on the waterproof sheet. The waterproof coating film which has is applied.

Example  2

2 mm thick asphalt sheet and 0.05 mm thick nonwoven fabric sheet are laminated to the waterproof sheet, and the thickness of 0.5 mm is obtained by using the urethane composition for waterproof coating film prepared in Synthesis Example 2 on the waterproof sheet. The waterproof coating film which has is applied.

Comparative example

The comparative example attaches a waterproof sheet in which a 2 mm thick asphalt sheet and a 0.05 mm nonwoven sheet are laminated on concrete, and a two-component urethane coating waterproofing material (Crytan 2100, Deepia Holdings, Korea) on the waterproof sheet. Was applied to a waterproof coating film having a thickness of 0.5 mm.

Building repair waterproof coating film prepared in Examples 1, 2 and Comparative Examples ^{(Note 1)} KSM 6518 method tensile strength (kg / cm ² ), elongation (%), hardness (Shore A) and adhesive strength (kgf / 2.5 cm) was measured. Results of the property evaluation items of the waterproofing coating film for building repair are disclosed in Table 1 below.

[Table 1] Evaluation of Properties of Waterproof Coating Film

(Note 1) Quality control based on KSM 6518 (vulcanized rubber) test criteria

Referring to Table 1, as can be seen in the physical property evaluation results for Examples 1 and 2, it is excellent in tensile strength and hardness properties, including the adhesive strength required for the formation of a waterproof coating film obtained using the obtained waterproof coating urethane composition It can be confirmed that having excellent adhesion without impairing the durability of the waterproof sheet layer. On the other hand, in the case of the comparative example it can be seen that the durability loss of the waterproof sheet layer of the lower by the included solvent is made and the adhesive strength is inferior. Particularly, in the case of Example 1, foaming does not occur even at high temperature and high humidity without causing a loss of durability in the waterproof sheet layer using the solvent-free urethane composition. The adhesion with the second waterproof coating of was also excellent.

According to the present invention, it is composed of a waterproof sheet and a urethane waterproof coating film is expected to have a double waterproof effect, by the preferential use of the waterproof sheet is applied to the insulation method instead of close contact method as a waterproof method waterproof layer against cracks and movement of buildings Breakage and loss of waterproofing effect can be reduced. In addition, since the waterproof coating is applied on the waterproof sheet fixed on the concrete layer, it is possible to shorten the ground clearance process without being bound by the old film to minimize the industrial waste can reduce the environmental pollution.

Although the above has been described with reference to the embodiments of the present invention, those skilled in the art may vary the present invention without departing from the spirit and scope of the present invention as set forth in the claims below. It will be understood that modifications and changes can be made.

1 is a cross-sectional view showing a waterproof sheet formed by a conventional composite waterproofing method.

2 is a cross-sectional view showing a composite waterproof structure for building repairs according to an embodiment of the present invention.

3 is a process flow diagram illustrating a composite waterproof construction method for building repairs according to an embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

100: concrete layer 102: old film

103: space 104: lower seat

106: top sheet 108: waterproof sheet

110: fixing member 112: first waterproof coating film

114: 2nd waterproof coating film 116: 3rd waterproof coating film

Claims (12)

Subjects including isocyanate compounds; And A curing agent comprising a reactive polyol including a polyol having a trifunctional group, a polyether polyol and a xylene-modified polyol, a filler and an antifoaming agent, The main composition and the curing agent is a urethane composition for waterproof coating, characterized in that it comprises a weight ratio of 1: 4 to 1: 6. According to claim 1, wherein the urethane composition for waterproofing coating film comprises the subject 18 to 25% by weight, the reactive polyol in the curing agent 20 to 30% by weight polyol having the tri-functional group, the polyether polyol 1 to 10 1% to 5% by weight of the xylene-modified polyol, wherein the filler is in the range of 30 to 50% by weight, and the antifoaming agent is a urethane composition for waterproof coating, characterized in that in the range of 0.1 to 0.5% by weight. The urethane composition for waterproofing coating films according to claim 1, wherein the equivalent ratio of the hydroxyl group of the reactive polyol and the isocyanate group of the isocyanate compound is 1: 1.0 to 1: 1.3. The urethane composition for waterproofing coating film according to claim 1, wherein the polyol having the trifunctional group in the reactive polyol is a castor oil or a trifunctional propylene polyether polyol. A waterproof sheet having a lower sheet comprising asphalt, improved asphalt, rubber modified asphalt, modified rubber, or a mixture thereof, and an upper sheet formed on the lower sheet and comprising a nonwoven fabric; A hardener comprising a main body comprising an isocyanate compound on the waterproof sheet and a reactive polyol including a polyol having a trifunctional group, a polyether polyol and a xylene-modified polyol, a filler and an antifoaming agent, wherein the main agent and the curing agent are 1: a first waterproof coating film formed using a urethane composition for waterproof coating, characterized in that it comprises a weight ratio of 1: 4 to 1: 6; A second waterproof coating film formed on the first waterproof coating film by using a middle liquid urethane waterproofing material; And The composite waterproof structure for building repairs comprising a third waterproofing coating formed on the second waterproofing coating using a liquid urethane waterproofing material for top coat. The urethane composition for waterproofing coating film according to claim 5, wherein the urethane composition for waterproofing coating film comprises 18 to 25 wt% of the main ingredient, and the reactive polyol in the curing agent is 20 to 30 wt% of the polyol having the trifunctional group, and the polyether polyol 1 to 10 1% by weight to 5% by weight of the xylene-modified polyol, wherein the filler is in the range of 30 to 50% by weight, and the antifoaming agent is a composite waterproof structure for building repairs, characterized in that 0.1 to 0.5% by weight. The composite waterproof structure for building repairs according to claim 5, wherein the thickness of the lower sheet of the waterproof sheet is 1 to 3 mm, and the thickness of the upper sheet is 0.01 to 1 mm. The composite waterproof structure for repairing a building according to claim 5, wherein the waterproof sheet is formed on an old coating film in a waterproof coating film forming region on a concrete layer. The composite waterproof structure for building repairs according to claim 8, wherein fixing holes through which fixing members for fixing the waterproof sheet on the concrete layer are formed at edge portions of the waterproof sheet. The composite waterproof structure of claim 5, wherein the first waterproof coating layer has a density of 0.5 to 1.4 kg / m ² and a thickness of 0.3 to 1.0 mm. Attaching a lower sheet including asphalt, improved asphalt, rubber-modified asphalt, or a mixture thereof, and a waterproof sheet in which an upper sheet including a nonwoven fabric is sequentially laminated on the coating film forming region on which the waterproof coating film is to be formed; And a curing agent comprising a main body including an isocyanate compound on the waterproof sheet and a reactive polyol including a polyol having a trifunctional group, a polyether polyol and a xylene-modified polyol, a filler and an antifoaming agent, wherein the main agent and the curing agent are 1 : Forming a first waterproof coating film using a urethane composition for waterproof coating, characterized in that it comprises a weight ratio of 4 to 1: 6; Forming a second waterproof coating film on the first waterproof coating film by using an intermediate liquid urethane waterproofing material; And Composite waterproof method comprising the step of forming a third waterproof coating film using a liquid urethane waterproofing material for the top coat on the second waterproof coating film. 12. The composite waterproof method according to claim 11, wherein the waterproof sheet is attached to the concrete layer by partially providing an adhesive to an edge portion of the waterproof sheet.

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