KR102593297B1 - Composite waterproofing construction method by using elastic coating material for waterproof and waterproof sheet - Google Patents

Abstract

A composite waterproofing construction method using a waterproofing elastic coating material and a waterproofing sheet is disclosed. According to a preferred embodiment of the present invention, a waterproofing elastic coating material is applied to the base surface, a waterproofing sheet is constructed on the applied waterproofing elastic coating material, and the waterproofing elastic coating material includes 70 to 85% by weight of isocyanate prepolymer and 10 to 10% by weight of latent hardener. It is a waterproof elastic coating containing 25% by weight and 0.5 to 2% by weight of an adhesion promoter.
According to the present invention, it is possible to construct a waterproofing layer directly on a structure, etc. without applying a primer, thereby significantly reducing the cost and time for waterproofing layer construction, and has excellent physical properties such as adhesion and elasticity, excellent waterproofing performance, and especially wet It has the advantage of being able to construct a waterproofing layer with excellent waterproofing performance even in the environment, and of being able to perform composite waterproofing construction without affecting the different waterproofing layers.

Description

Composite waterproofing construction method by using elastic coating material for waterproof and waterproof sheet}

The present invention relates to a composite waterproofing construction method, and more specifically, to a composite waterproofing construction method using a waterproofing elastic coating material and a waterproofing sheet that can perform the functions of a primer and a waterproofing layer together without a primer.

Various research and developments are being conducted for waterproofing in structures, etc., but in general, it is difficult to construct a waterproofing layer directly on a concrete structure, so a primer is applied to the base of the structure and then a waterproofing layer is applied using various methods such as waterproofing liquid, coating, and sheets. Construction is underway.

In other words, primer construction is one of the essential matters in waterproofing layer construction, but the increase in cost and time due to primer construction becomes a problem during primer construction.

For this reason, various research and development efforts are being conducted to construct a waterproofing layer directly on structures, etc. without applying a primer.

However, materials and construction methods that allow the construction of a waterproof layer directly on a structure, etc. without applying a conventional primer have a problem in that they cannot be widely used due to their low adhesion to the structure and low waterproofing performance.

In addition, when forming a waterproof layer in a humid environment, there is a high possibility that defects in the waterproof layer will occur due to moisture, etc., so the formation of the waterproof layer must be done in an environment where the concrete is completely hardened or moisture is minimized, so there is a problem that construction of the waterproof layer takes a lot of time.

Meanwhile, recently, considering the waterproofing performance of the waterproofing layer when constructing the waterproofing layer, a composite waterproofing construction method that improves the performance of the waterproofing layer by combining various waterproofing layers rather than constructing with only one waterproofing layer has been widely used.

However, even if materials and construction methods have been developed to construct a waterproofing layer directly on a structure, etc. without applying a primer, it is difficult to apply the composite waterproofing construction method because it is affected by the type or component of the waterproofing layer used together in the composite waterproofing construction. There is a problem.

In order to solve the conventional problems as described above, the present invention uses a waterproofing elastic coating material and a waterproofing sheet that are capable of directly constructing a waterproofing layer on a structure, etc. without applying a primer, and have excellent physical properties such as adhesion and elasticity and excellent waterproofing performance. A composite waterproofing construction method is proposed.

In addition, we propose a composite waterproofing construction method using a waterproofing elastic coating material and a waterproofing sheet, which allows the construction of a waterproofing layer with excellent waterproofing performance even in a humid environment, significantly reducing the cost and time of waterproofing layer construction.

In addition, we propose a composite waterproofing construction method using a waterproofing elastic coating material and a waterproofing sheet that do not affect the different waterproofing layers and thus do not deteriorate waterproofing performance even after the construction of the waterproofing layer.

Other objects of the present invention can be easily understood through the description of the embodiments below.

In order to achieve the above-mentioned object, according to one aspect of the present invention, a composite waterproofing construction method using a waterproofing elastic coating material and a waterproofing sheet is provided.

According to a preferred embodiment of the present invention, a composite waterproofing construction method includes the steps of applying a waterproofing elastic coating material to the base surface; And a step of constructing a waterproof sheet on the applied waterproof elastic coating material, wherein the waterproof elastic coating material contains 70 to 85% by weight of isocyanate prepolymer, 10 to 25% by weight of latent hardener, and 0.5 to 2% by weight of adhesion promoter. A composite waterproofing construction method is provided, characterized in that it is an elastic coating material for waterproofing containing % by weight.

In the step of constructing a waterproof sheet on the applied waterproof elastic coating material, the waterproof sheet may be one of a rubberized asphalt waterproof sheet or a butyl waterproof sheet.

The waterproof elastic coating material further includes a catalyst, an antifoaming solvent, and a surface tension reducing agent, and the catalyst, the antifoaming solvent, and the surface tension reducing agent may each be included in the elastic coating material in an amount of 1% by weight or less.

The isocyanate prepolymer may be prepared containing 20 to 30% by weight of isocyanate, 30 to 50% by weight of two or more polyols with different molecular weights, 25 to 35% by weight of chain extender, and 1 to 5% by weight of viscosity modifier. there is.

And the isocyanate includes toluene diisocyanate (TDI), methylene diphenyl diisocyanate (MDI), isoprene diisocyanate (IPDI), and hexamethylene diisocyanate (Hexamethylene diisocyanate). It may be at least one of HDI) and hydrogenated MDI (4-cyclohexyl isocyanate: H12MDI).

Additionally, the at least two types of polyols having different molecular weights may be at least one of polypropylene glycol, polycarbonate polyol, polycaprolactone polyester, and polyester.

And the at least two polyols with different molecular weights are polypropylene glycol with a molecular weight of 1000 and polypropylene glycol with a molecular weight of 400, and the polypropylene glycol with a molecular weight of 1000 is 25 to 35% by weight of the total weight %, and the polypropylene with a molecular weight of 400 Glycol can be 5 to 15% by weight.

The chain extender includes ethylene glycol (EG), trimethylolpropane (TMP), 1,3-butanediol (1,3-BD), and 1,4-butanediol (1,4-BD). , 1,6-hexanediol (1,6-HD), and glycerine.

The viscosity modifier may be at least one of xylene, toluene, ethyl acetate, dimethyl carbonate, methyl ethyl ketone, and dibasic ester. .

As described above, according to the composite waterproofing construction method using a waterproofing elastic coating material and a waterproofing sheet according to the present invention, a waterproofing layer can be directly constructed on a structure, etc. without applying a primer, thereby significantly reducing the cost and time of waterproofing layer construction. There is an advantage.

In addition, it has excellent physical properties such as adhesion and elasticity, and has excellent waterproofing performance. In particular, it has the advantage of being able to construct a waterproofing layer with excellent waterproofing performance even in a humid environment.

In addition, there is an advantage in that composite waterproofing construction is possible in which waterproofing performance is not deteriorated even in composite waterproofing construction because different waterproofing layers do not affect each other.

1 is a flowchart showing the procedure for producing an isocyanate prepolymer used in the production of a waterproof elastic coating material used in a preferred embodiment of the present invention.
Figure 2 is a flow chart showing the process of composite waterproofing construction using a waterproofing elastic coating material and a waterproofing sheet according to a preferred embodiment of the present invention.

Since the present invention can make various changes and have various embodiments, specific embodiments will be illustrated in the drawings and described in detail in the detailed description. However, this is not intended to limit the present invention to specific embodiments, and should be understood to include all changes, equivalents, and substitutes included in the spirit and technical scope of the present invention.

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the attached drawings, but identical or corresponding components will be assigned the same reference numerals regardless of the reference numerals, and duplicate descriptions thereof will be omitted.

First, the term elastic coating material is used in the present invention, but it is used to mean a material that is painted or attached to a surface with elasticity that can immediately form a waterproof layer on the substrate without a primer. Depending on the intended use, etc., it can be used as a waterproofing material or a coating film. Other terms such as material or structural material may also be used, but are not limited thereto.

And, as in the past, after applying a primer, a waterproofing layer can be formed using the elastic coating material according to the present invention. However, the present invention will be described below with a focus on the feature of immediately forming a waterproofing layer on the base surface without a primer.

In addition, the elastic coating material according to the present invention can be applied directly to the base surface without a primer to form a waterproof layer, but can also be applied to a composite waterproofing construction method that is applied together with other waterproofing methods, in which case it also acts as a waterproofing material in itself. Not only does it perform a waterproofing function, but it can also perform a waterproofing function together with other waterproofing methods without any influence on the materials used in other waterproofing methods.

In particular, we will look at the elastic coating material for waterproofing used in the present invention, which eliminates the need for such a primer and allows it to be used with other waterproofing methods without any influence on the materials used in other waterproofing methods.

First, in order to manufacture the waterproof elastic coating material used in the present invention, isocyanate prepolymer, which is a material for the elastic coating material, must be manufactured.

Figure 1 is a flow chart showing the procedure for manufacturing the isocyanate prepolymer used in the elastic coating material used in a preferred embodiment of the present invention.

Isocyanate prepolymer, also called pre isocyanate, is generally manufactured to be used as a material for manufacturing polyurethane.

Meanwhile, the isocyanate prepolymer used to manufacture the elastic coating material used in a preferred embodiment of the present invention is prepared by using two or more polyols with different molecular weights.

It is manufactured by mixing isocyanate with two or more polyols of different molecular weights, a chain extender, and a viscosity regulator.

As shown in Figure 1, the preparation of the isocyanate prepolymer used in the elastic coating material used in a preferred embodiment of the present invention first includes 20 to 30% by weight of isocyanate, 30 to 50% by weight of two or more polyols with different molecular weights, and chain. Raw materials are added to the reactor at a ratio of 25 to 35% by weight of the extender and 1 to 5% by weight of the viscosity regulator and mixed (S100).

Next, the temperature of the reactor is raised to 70 to 95 degrees (S102), and the reaction is carried out in the reactor for 2 to 6 hours at the elevated temperature (S104) to synthesize an isocyanate prepolymer for manufacturing the elastic coating material used in the present invention. there is.

It would be desirable to terminate the isocyanate prepolymer reaction when the theoretical content % is reached after analysis using the CO(%) titration method.

And as a result of confirming through a number of experiments, if the isocyanate prepolymer prepared in this way has an NCO (%) of 3% or less, and if it is used to manufacture a waterproof elastic coating material used in a preferred embodiment of the present invention, it may not have enough hardness to replace the primer. Since the elongation rate can be greatly reduced when more than 10% is used, it is preferable that the isocyanate prepolymer used in the present invention has an NCO (%) of 3% or more and 10% or less, but is not limited thereto.

Meanwhile, the isocyanate used in the isocyanate prepolymer used to produce the elastic coating material used in a preferred embodiment of the present invention is toluene diisocyanate (TDI) and methylene diphenyl diisocyanate (MDI). , isoprene diisocyanate (IPDI), hexamethylene diisocyanate (HDI), and hydrogenated MDI (Hydrogenated MDI, 4-cyclohexyl isocyanate: H12MDI) can be used, more preferably may be toluene diisocyanate.

And the two or more polyols with different molecular weights may be at least one of polypropylene glycol, polycarbonate polyol, polycaprolactone polyester, and polyester, and more preferably It may be polypropylene glycol.

In particular, when two or more polyols with different molecular weights are polypropylene glycol, the two or more polyols with different molecular weights are polypropylene glycol with a molecular weight of 1000 and polypropylene glycol with a molecular weight of 400, and polypropylene glycol with a molecular weight of 1000 is 25 to 35% by weight of the total weight. The polypropylene glycol content by weight and molecular weight of 400 is preferably 5 to 15% by weight, but is not limited thereto.

Chain extenders include ethylene glycol (EG), trimethylolpropane (TMP), 1,3-butanediol (1,3-BD), and 1,4-butanediol (1,4). -BD), 1,6-hexanediol (1,6-HD), and glycerine, and more preferably trimethylopropane.

Viscosity regulators include xylene, toluene (ethyl acetate), dimethyl carbonate, methyl ethyl ketone, and dibasic ester to control the viscosity of the isocyanate prepolymer. ) can be used, and more preferably xylene.

The isocyanate prepolymer prepared in this way is used to manufacture a waterproof elastic coating material used in a preferred embodiment of the present invention.

The waterproof elastic coating material used in a preferred embodiment of the present invention can be prepared by stirring 70 to 85% by weight of isocyanate prepolymer, 10 to 25% by weight of latent hardener, and 0.5 to 2% by weight of adhesion promoter.

At this time, a catalyst, an antifoaming solvent, and a surface tension reducing agent may be further included, but it is preferable that the catalyst, an antifoaming solvent, and a surface tension reducing agent each be included in an amount of 1% by weight or less based on the total weight ratio.

The latent hardener may be used by selecting at least one of aldimine, ketimine, and oxazolidine.

The role of the latent hardener is that general polyurethane primers have the problem of foaming due to moisture present on a wet substrate, making it difficult to form a paint film. However, by using a latent hardener that can react with moisture, the foaming problem is solved and the paint film is formed. It allows the formation of a type coating material.

In addition, the latent hardener reacts with moisture in the air or moisture on the wet surface and is converted into amine or amine polyol, which acts as a chain extender during the reaction.

It is desirable to use the latent hardener in an amount ranging from 30% to 100% of the isocyanate prepolymer.

As a result of the experiment, if the latent hardener is used less than 30% equivalent, foaming phenomenon and curing speed may be slowed due to the absence of an amount that can react with moisture in the air or moisture on the wet substrate, and if more than 100% equivalent is used, curing speed problems may occur. And it was shown that physical properties were deteriorated due to aldehyde or ketone remaining after the reaction.

The adhesion promoter can be a silane coupling agent that can improve adhesion to a wet substrate.

The silane coupling agent has two or more different reactive groups in the molecule, one of which chemically bonds with inorganic materials, and the other reactive group chemically bonds with organic materials.

Therefore, it functions as an intermediary connecting organic and inorganic materials, which are difficult to connect, and plays a role in promoting adhesion to the wet substrate.

Meanwhile, a waterproof elastic coating material used in a preferred embodiment of the present invention having various hardnesses and elongations can be manufactured through various changes in the components of the isocyanate prepolymer used in the present invention.

In particular, it is possible to manufacture a waterproof elastic coating material with a wide range of physical properties ranging from hardness A70 to A95 and elongation of 150 to 450%.

And since typical polyurethane and epoxy primers have an elongation of 50% or less, cracks may occur due to vibration or impact, but the waterproof elastic coating material according to the present invention is elastic and can absorb shock and vibration, making it strong against cracks.

In order to use the waterproof elastic coating material used in a preferred embodiment of the present invention in a coating form, it is desirable to secure a certain level of viscosity, and in particular, it is desirable to adjust the physical properties to achieve a viscosity of 100 to 1000 cps.

As a result of the experiment, when the viscosity is less than 100 cps, it can flow between the concrete surfaces, and when it is more than 1000 cps, the waterproof elastic coating material used in a preferred embodiment of the present invention may be used in a relatively larger amount due to the high viscosity.

When the waterproof elastic coating material used in a preferred embodiment of the present invention is implemented in the form of a coating film, experimental results show that the thickness after drying is preferably 0.3 mm to 1.0 mm.

If the thickness is less than 0.3 mm, the performance and waterproofing effect as a coating film are reduced, and if it is more than 1.0 mm, the coating film thickness becomes thick, so the elastic coating material for waterproofing used in a preferred embodiment of the present invention may be widely used.

The waterproofing elastic coating material used in this preferred embodiment of the present invention reacts with moisture to form a coating-type waterproofing elastic coating material without foaming problems, making it possible to construct a waterproofing layer directly on a structure, etc. without applying a primer.

At the same time, it has excellent physical properties such as adhesion and elasticity, resulting in excellent waterproofing performance.

In addition, it reacts with moisture to form a waterproof elastic coating material in the form of a film without foaming problems, taking into account site conditions, etc., even in humid environments such as underground or immediately after pouring concrete or after construction such as forming a plaster surface. It is possible to form a waterproof layer by constructing a waterproof elastic coating material used in a preferred embodiment of the invention.

In addition, the latent hardener reacts with moisture in the air or moisture on the wet surface and is converted into amine or amine polyol, which acts as a chain extender during the reaction, thereby preventing the generation of bubbles or a decrease in the curing speed.

In addition, due to the use of a mixed component of isocyanate and polyols with various molecular weights, composite waterproofing construction is possible by minimizing the influence of the type or composition of other waterproofing layers even when constructed together with other waterproofing materials or waterproofing construction methods.

Therefore, the waterproofing elastic coating material used in a preferred embodiment of the present invention can be used alone or in combination and regardless of wet or non-humid environments, allowing it to be used in a variety of ways.

In the present invention, a composite waterproof layer is formed by using a waterproof elastic coating material having these characteristics and constructing it together with a waterproof sheet.

With reference to Figure 2, we will look at a composite waterproofing construction method using a waterproofing elastic coating material and a waterproofing sheet according to a preferred embodiment of the present invention.

As shown in Figure 2, the composite waterproofing construction method using a waterproofing elastic coating material and a waterproofing sheet according to a preferred embodiment of the present invention first constructs the waterproofing elastic coating material used in the present invention (S200), and then applies waterproofing to the formed waterproofing layer. Construct the sheet (S202).

First, the construction of the waterproof elastic coating material can be performed by applying it using a tool such as a brush or roller, like general liquid waterproofing construction.

However, in the present invention, due to the characteristics of the waterproofing elastic coating material used in the present invention, it is possible to directly apply the waterproofing elastic coating material to the base surface without performing any process such as applying a primer.

In addition, background cleaning, protection, curing, etc. can be carried out in accordance with the liquid waterproofing method and in accordance with standard specifications.

Meanwhile, in the case of forming a composite waterproofing layer on the base surface after pouring concrete, in the present invention, due to the characteristics of the elastic coating material used in the present invention, the waterproofing elastic coating material can be applied after curing the concrete only for the minimum curing period.

Although it varies depending on the type of concrete, it is generally possible to apply a waterproofing elastic coating before the curing period of 3 days or more, which is the minimum curing period for concrete.

However, due to the nature of the waterproofing elastic coating material used in the present invention, it will be applied using a tool such as a brush or roller, so it is preferable to apply the waterproofing elastic coating material used in the present invention after the concrete has hardened to some extent.

Meanwhile, a composite waterproof layer is formed by constructing a waterproof sheet after constructing the waterproof layer formed by the waterproof elastic coating material.

Construction of a waterproof sheet can be done immediately after applying the waterproofing elastic coating material or after the elastic coating material has completely dried.

As mentioned above, due to the characteristics of the waterproof elastic coating material used in the present invention, it exhibits high adhesion and bonding power with other substances in a wet state.

However, due to the nature of the construction of the waterproof sheet, the worker must perform the work on the base surface, so it is preferable to perform the construction of the waterproof sheet after the elastic coating material has completed drying, but it is not limited to this.

Meanwhile, the type of waterproof sheet used in the present invention is not limited, but is preferably a rubberized asphalt waterproof sheet or a butyl waterproof sheet.

Rubberized asphalt waterproof sheets and butyl waterproof sheets are the most widely used waterproof sheets, and are especially widely used as self-adhesive sheets that provide convenience in construction. When used in the present invention, they are used together with the elastic waterproofing coating material used in the present invention to extend the construction period. and costs can be greatly reduced.

Meanwhile, the construction of waterproof sheets is carried out according to standard specifications, and in particular, there are no restrictions on subsequent processes, such as treatment of joints between waterproof sheets or construction of pressed concrete.

For example, various methods may be possible without any limitation, such as overlapping the joints between waterproof sheets, attaching separate tapes or sheets for reinforcement, and sealant treatment of the joints.

According to the composite waterproofing construction method according to the present invention, due to the characteristics of the waterproofing elastic coating material used in the present invention, a primary waterproofing layer can be formed without primer work, drying is also fast, and depending on working conditions, before complete drying of the waterproofing elastic coating material. By making it possible to construct waterproof sheets, not only construction time but also costs are greatly reduced.

In addition, when rubberized asphalt waterproof sheets or butyl waterproof sheets are used in a composite waterproofing construction method, the rubberized asphalt waterproof sheets or butyl waterproof sheets may melt, deform, or deteriorate due to the components contained in other waterproof layers, especially the plasticizer components. There was a problem.

However, the elastic coating material used in the present invention uses a mixture of isocyanate and polyol with various molecular weights, and does not contain a plasticizer, so it can be rubberized without affecting the rubberized asphalt waterproof sheet or butyl waterproof sheet at all. It is integrated with an asphalt waterproof sheet or butyl waterproof sheet to provide excellent waterproofing performance.

The preferred embodiments of the present invention described above have been disclosed for illustrative purposes, and those skilled in the art will be able to make various modifications, changes, and additions within the spirit and scope of the present invention, and such modifications, changes, and additions will be possible. The addition should be viewed as falling within the scope of the patent claims below.

Claims (9)

In the composite waterproofing construction method,
Applying a waterproof elastic coating to the base surface; and
Comprising the step of constructing a waterproof sheet on the applied waterproof elastic coating material,
The waterproof elastic coating material is,
Containing 70 to 85% by weight of isocyanate prepolymer, 10 to 25% by weight of latent hardener and 0.5 to 2% by weight of adhesion promoter,
The isocyanate prepolymer is,
A composite waterproofing material, characterized in that it is manufactured including 20 to 30% by weight of isocyanate, 30 to 50% by weight of two or more polyols with different molecular weights, 25 to 35% by weight of chain extender, and 1 to 5% by weight of viscosity modifier. Construction method.
According to paragraph 1,
In the step of constructing a waterproof sheet on the applied waterproof elastic coating material,
A composite waterproofing construction method, wherein the waterproofing sheet is one of a rubberized asphalt waterproofing sheet or a butyl waterproofing sheet.
According to paragraph 1,
The waterproof elastic coating material is,
A composite waterproofing construction method further comprising a catalyst, an antifoaming solvent, and a surface tension reducing agent, wherein the catalyst, the antifoaming solvent, and the surface tension reducing agent are each included in the elastic coating material in an amount of 1% by weight or less.
delete According to paragraph 1,
The isocyanate includes toluene diisocyanate (TDI), methylene diphenyl diisocyanate (MDI), isoprene diisocyanate (IPDI), and hexamethylene diisocyanate (HDI). ) and Hydrogenated MDI (4-cyclohexyl isocyanate: H12MDI).
According to paragraph 1,
The at least two polyols having different molecular weights are at least one of polypropylene glycol, polycarbonate polyol, polycaprolactone polyester, and polyester. Waterproofing construction method.
According to clause 6,
The at least two types of polyols with different molecular weights are polypropylene glycol with a molecular weight of 1000 and polypropylene glycol with a molecular weight of 400, and the polypropylene glycol with a molecular weight of 1000 is 25 to 35% by weight of the total weight %, and the polypropylene glycol with a molecular weight of 400 A composite waterproofing construction method, characterized in that silver is 5 to 15% by weight.
According to paragraph 1,
The chain extender includes ethylene glycol (EG), trimethylolpropane (TMP), 1,3-butanediol (1,3-BD), and 1,4-butanediol (1,4-BD). , A composite waterproofing construction method comprising at least one of 1,6-hexanediol (1,6-HD) and glycerine.
According to paragraph 1,
The viscosity modifier is at least one of xylene, toluene (ethyl acetate), dimethyl carbonate, methyl ethyl ketone, and dibasic ester. Composite waterproofing construction method.