KR20220006727A - Heat-resistant polyurea waterproofing method for enhancing building durability - Google Patents

Abstract

The present invention relates to a heat-insulation polyurea waterproofing method for enhancing the durability of a building. The heat-insulation polyurea waterproofing method includes the following steps of: pretreating any one type of floor surface selected from a group comprising a steel surface, a concrete surface, an asphalt shingle surface and an ascon surface, as a floor surface having an inclination of 5-40 degrees; forming a base coating layer by applying a primer for polyurea onto the pretreated floor surface; forming a first middle coating layer by applying a polyurea primary agent and a hardening agent onto the base coating layer; installing a mesh on the first middle coating layer; forming a second middle coating layer by applying the polyurea primary agent and the hardening agent onto the mesh; and forming a top coating layer by applying a heat-insulation paint onto the second middle coating layer. Therefore, an even and thick polyurea layer can be formed even on an inclined roof, and durability and waterproofness can be maintained for a long period even after the installation of a structure.

Description

HEAT-RESISTANT POLYUREA WATERPROOFING METHOD FOR ENHNCING BUILDING DURABILITY

The present invention relates to a heat-shielding polyurea waterproofing method for strengthening the durability of a building, and more particularly, to forming a multi-layered heat-shielding polyurea waterproofing layer on a roof of a building.

When moisture permeates into the building due to rain or the like, it affects the durability of the building, so it is common to waterproof the roof of the building using various waterproofing materials.

However, in particular, when various facilities with large loads such as photovoltaic power generation facilities, communication equipment, and cranes are installed on a roof having a slope, defects such as cracks occur in the waterproofing layer due to the vibration of the facility due to its own load or wind. As a result, leaks may occur again.

For leak prevention repair, it is necessary to re-waterproof after relocating or dismantling a facility installed on the roof of a building, which is not easy considering the load and volume of the facility.

Therefore, before installing facilities on a sloped roof, waterproofing should be done by thickening the waterproofing layer. Epoxy resins and polyurethane resins, which are used as the subject of the conventional coating film waterproofing method, have a slow curing rate. Did not do it. Accordingly, a waterproofing method using polyurea, which has a fast curing rate, has been introduced, but it is difficult to form a uniform and thick waterproofing layer due to low self-smoothness.

Republic of Korea Patent Publication No. 10-1380955 Republic of Korea Patent Publication No. 10-1991240

The present invention is to solve the above-mentioned conventional problems, and by forming a multi-layer structure using a mesh on the roof of a building and a heat-shielding polyurea waterproofing layer of a specific composition, to strengthen the resistance to the load of the facility itself, and to maintain the waterproofness for a long time It is possible to provide a heat-shielding polyurea waterproofing method that can reduce building maintenance costs.

The present invention, as a floor surface having a slope of 5 to 40 degrees, comprising the steps of pre-treating any one floor surface selected from the group consisting of iron surface, concrete surface, asphalt shingle surface, asphalt concrete surface; forming an undercoat layer by applying a primer for polyurea on the pretreated bottom surface; forming a first intermediate layer by applying a polyurea main agent and a curing agent on the undercoat layer; installing a mesh on the first intermediate layer; forming a second intermediate layer by applying a polyurea main agent and a curing agent on the mesh; and forming a top coat layer by applying a heat shielding paint on the second intermediate layer.

The heat-shielding polyurea waterproofing method for strengthening the durability of a building according to the present invention forms a heat-shielding polyurea waterproofing layer with strong durability and endurance on a sloped roof, so that excellent waterproofness can be maintained even after a structure with a large load is installed, In addition, it is possible to reduce the maintenance cost of the building.

1 is a flowchart of a heat-shielding polyurea waterproofing method of the present invention.

The heat-shielding polyurea waterproofing method of the present invention, as a floor surface having a slope of 5 to 40 degrees, pre-treating any one floor surface selected from the group consisting of iron surface, concrete surface, asphalt shingle surface, and asphalt surface (S1) ; forming an undercoat layer by applying a primer for polyurea on the pretreated bottom surface (S2); forming a first intermediate layer by applying a polyurea main agent and a curing agent on the undercoat layer (S3); Installing a mesh on the first intermediate layer (S4); forming a second intermediate layer by applying a polyurea main agent and a curing agent on the mesh (S5); and forming a top coat layer by applying a thermal barrier paint on the second intermediate coat layer (S6).

As used herein, the term 'roof' refers to a floor surface exposed to the outside as the uppermost part of a building.

Steps to pretreat the floor surface

Remove the previously installed waterproofing layer, or remove foreign substances such as moisture, dust, and oil from the floor surface and level it. More specifically, the iron surface is washed, and the raised old coating film or the corrosion site is removed. Or, clean the concrete surface, grind uneven parts, or fill in gaps or grooves to level it.

forming an undercoat layer

The undercoat layer improves the adhesion between the bottom surface and the top layer, and acts as a buffer between the bottom surface and the top layer to prevent the cracks in the top layer or the bottom surface from being absorbed by each other.

In order to improve adhesion to the polyurea intermediate layer, a primer for polyurea is applied on the bottom surface to form an undercoat layer.

An appropriate primer for polyurea can be selected and applied according to the type of floor surface. If the floor is steel, Super Deck 110 (Samhwa Paint Co., Ltd.) can be used as a primer for polyurea, and if the floor is concrete, Super Deck 100 (Samwha Paint Co., Ltd.) can

It can be constructed under the conditions of an atmospheric temperature of 5 to 40 ° C, a floor temperature of 5 to 40 ° C, and a relative humidity of 80% or less, and the thickness of the formed undercoating layer may be 30 to 80 μm.

Forming a first intermediate layer

A first intermediate layer is formed by applying a polyurea main agent and a curing agent on the undercoating layer.

Polyurea has excellent physical and chemical properties such as tensile strength, tear strength, elongation rate, abrasion resistance, impact resistance, adhesion, corrosion resistance, and chemical resistance, and is widely used in various fields such as construction, ships, and chemical storage tanks.

The polyurea main ingredient is 60 to 70 wt% of poly(oxypropylene) diamine, 20 to 30 wt% of diethylmethylbenzenediamine, and glycerol tris [poly(propylene glycol) amyl end] with respect to 100 wt% of the total content of the polyurea main agent. 1 to 10% by weight of ether, 1 to 10% by weight of trimethoxypropylsilane, 1 to 10% by weight of silicon dioxide, and 1 to 10% by weight of titanium dioxide.

The poly(oxypropylene)diamine is included in the range of 50 to 80% by weight in the main agent, and if the content is less than 50% by weight, the physical properties such as tensile strength and elongation of the coating film are weakened, and the waterproof function is deteriorated, and 80% by weight If it is exceeded, the viscosity is too high and there is a difficulty in construction.

The silicon dioxide and titanium dioxide are each included in the range of 1 to 10% by weight in the main body, and by being within the above range, the mechanical strength is increased to reinforce the proof strength of the waterproof layer, and the high-strength reinforcing properties of the waterproof layer can be increased. make it effective

The curing agent may include any one or more selected from polyamines, amine compounds, toluene diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, xylene diisocyanate, and methylene diphenyl diisocyanate, preferably methylene diphenyl diisocyanate It may be a curing agent comprising a.

The first intermediate layer is formed by simultaneously applying a polyurea main agent and a curing agent at a temperature of 70 to 90° C. at a pressure of 2000 to 4000 psi and curing for 15 to 30 seconds using a polyurea-only spray equipment.

The polyurea main agent and the curing agent are used in a volume ratio of 1:0.5 to 1:1.5, preferably 1:1.

H-XP3, E-XP2, E-10, AP GUN, MP GUN and CS GUN can be selected for polyurea-only spray equipment.

It can be constructed under the conditions of an atmospheric temperature of 5 to 40 ° C, a floor temperature of 5 to 40 ° C, a relative humidity of 80% or less, and a surface moisture content of 6% or less, and the thickness of the formed first intermediate layer may be 0.1 to 10 mm. If it is less than 0.1mm, adhesion, waterproofness and corrosion resistance may be reduced, and if it is more than 10mm, ease of construction and economical efficiency may be reduced.

Steps to install the mesh

The mesh installed on the first intermediate layer is a sheet made of any one fiber selected from the group consisting of glass fiber, carbon fiber, and aramid fiber.

The thickness of the mesh is 0.5mm to 3mm. If the thickness is less than 0.5mm, the waterproofness and durability of the polyurea waterproofing layer may be reduced, and if it is more than 3mm, the ease of construction and economic feasibility may be reduced.

By forming the mesh between the first intermediate layer and the second intermediate layer, a multi-layered polyurea intermediate layer may be formed. In the case of a roof with a slope of 5 to 40 degrees, polyurea paint flows down depending on the site conditions or climate, making it difficult to form a uniform and thick intermediate layer of 10 mm or more. However, when the mesh is formed on the first intermediate layer, the polyurea paint can be fixed by the dense mesh, so that a more uniform intermediate layer can be formed, and the polyurea intermediate layer can be formed again thereon. In addition, by forming a structure in which the polyurea intermediate layer and the mesh are repeatedly laminated, a thick intermediate layer can be formed in the inclined roof, and waterproofness and durability can be maintained.

In particular, when the bottom surface is a steel surface, the steel material expands or contracts depending on the weather due to the nature of the steel, and the connection part is widened or the bolt connecting the iron surface is separated by repetition of expansion and contraction. Due to the expansion and contraction of the steel roof, cracks and the like occur in the waterproofing layer, resulting in water leakage. However, it is possible to withstand the expansion and contraction of the iron surface by the repeated stacking structure of the intermediate layer and the mesh as described above, and maintain the waterproofness and durability of the waterproofing layer.

In addition, even when the floor surface is a concrete surface, asphalt shingle surface, or asphalt surface, cracks or separation of connection parts, corrosion, etc. may occur due to repeated long-term temperature difference, UV exposure, rainwater, etc., but repetition of intermediate layer and mesh With the laminated structure, the waterproofness and durability of the waterproofing layer can be maintained.

Forming a second intermediate layer on the mesh

A second intermediate layer is formed by coating a polyurea base material and a curing agent on the mesh. The polyurea main agent and curing agent used for the second intermediate layer may be the same as or different from the polyurea main agent and curing agent used for the first intermediate layer. The method of forming the second intermediate layer may be the same as or different from the method of forming the first intermediate layer.

Forming a heat-shielding top coat layer

The top coat layer is the outermost layer of the waterproof layer, and may be formed by applying a heat shielding paint on the middle layer. In the case of using a heat-shielding paint, it is easy to control the room temperature, it is possible to reduce the energy required to maintain the temperature, and it is possible to prevent the crack, separation, and corrosion of the waterproofing layer by suppressing the temperature rise of the surface to be coated. It is possible to prevent cracks, separation, and corrosion of the waterproofing layer due to contraction and expansion.

It can be installed under the conditions of an atmospheric temperature of 5 to 35° C. and a relative humidity of 80% or less, and the thickness of the formed top coat may be 40 to 60 μm.

According to the polyurea waterproofing method for enhancing the durability of a building including the above-described configuration, in the inclined roof, by forming a multi-layered polyurea waterproofing layer including a mesh before installing the structure, uniform and thick polyurea even in the inclined roof Layers can be formed, and durability and waterproofness can be maintained for a long time even after the structure is installed.

Hereinafter, it will be described with reference to specific examples. The examples shown below are only preferred examples of the present invention, and the present invention is not limited by the following examples.

Preparation Example 1

Based on 100% by weight of the total content of the polyurea main ingredient, 63% by weight of poly(oxypropylene)diamine, 27% by weight of diethylmethylbenzenediamine, 5% by weight of glycerol tris[poly(propyleneglycol)amyl terminal]ether, trimethoxy 3 wt% of propylsilane, 1 wt% of silicon dioxide, and 1 wt% of titanium dioxide were mixed to prepare a base material.

Based on 100% by weight of the total content of the curing agent, 20% by weight of methylenebisdiphenyldiisocyanate, 20% by weight of alpha-hydro-omega-hydroxypoly(oxy(methyl-1,2-ethanediyl)) and 20% by weight of 2-ethyl- 60 wt% of 2-(hydroxymethyl)-1,3-propanediol is mixed to prepare a curing agent.

The polyurea main agent and the curing agent are mixed in a volume ratio of 1:1.

Test Example 1

Table 1 shows the results measured according to KS F 4922 test standards for the polyurea intermediate layer prepared in Preparation Example 1.

It can be seen that the middle layer satisfies all the standards of KS F 4922.

Example 1

Wash the steel floor with a 30 degree inclination, and pre-treat by removing the flaky old paint film or corroded parts using a grinder, abrasive cloth, etc. Superdeck 110 (Samhwa Paint Co., Ltd.) is applied as a primer for polyurea on the pretreated iron bottom surface to form an undercoat layer with a thickness of 50 μm. A first intermediate layer having a thickness of 1 mm is formed by applying the polyurea and curing agent prepared in Preparation Example 1 in a volume ratio of 1:1 and spray equipment using H-XP3 and CS GUN. A glass fiber mesh having a thickness of 1 mm is installed on the formed first intermediate layer. A second intermediate layer having a thickness of 3 mm is formed by applying the same method as the method for forming the first intermediate layer on the mesh. At this time, the formed second intermediate layer is applied to sufficiently cover the glass fiber mesh. A top coat layer with a thickness of 50 μm is formed by applying a heat shielding paint on the formed second intermediate layer.

On the other hand, the embodiments disclosed in the present specification and drawings are merely presented as specific examples to aid understanding, and are not intended to limit the scope of the present invention. It is apparent to those of ordinary skill in the art to which the present invention pertains that other modifications based on the technical spirit of the present invention can be implemented in addition to the embodiments disclosed herein.

Claims (4)

Pre-treating any one floor surface selected from the group consisting of an iron surface, a concrete surface, an asphalt shingle surface, and an asphalt surface as a floor surface having a slope of 5 to 40 degrees;
forming an undercoat layer by applying a primer for polyurea on the pretreated bottom surface;
forming a first intermediate layer by applying a polyurea main agent and a curing agent on the undercoat layer;
installing a mesh on the first intermediate layer;
forming a second intermediate layer by applying a polyurea main agent and a curing agent on the mesh; and
Forming a top coat layer by applying a heat-shielding paint on the second intermediate layer
A heat-shielding polyurea waterproofing method comprising a. The method of claim 1,
The bottom surface is a heat shielding polyurea waterproofing method that is a steel surface having a slope of 5 to 40 degrees. 3. The method of claim 2,
The mesh is a glass fiber mesh polyurea waterproofing method. 4. The method of claim 3,
The polyurea main agent is based on 100% by weight of the total content of the polyurea main agent, 60 to 70% by weight of poly(oxypropylene)diamine, 20 to 30% by weight of diethylmethylbenzenediamine, glycerol tris[poly(propyleneglycol)amyl terminal ] containing 1 to 10% by weight of ether, 1 to 10% by weight of trimethoxypropylsilane, 1 to 10% by weight of silicon dioxide and 1 to 10% by weight of titanium dioxide,
The curing agent is methylenebisdiphenyldiisocyanate 20% by weight, alpha-hydro-omega-hydroxypoly(oxy(methyl-1,2-ethanediyl)) 20% by weight and 2-ethyl-2-(hydroxymethyl) -1,3-propanediol 60% by weight,
A heat shielding polyurea waterproofing method in which the polyurea main agent and the curing agent are mixed in a volume ratio of 1:1 and applied.

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