KR102470737B1 - Waterproof sheet and construction method thereof - Google Patents

Abstract

The present invention relates to a waterproof sheet and a construction method thereof, and more specifically, to a waterproof sheet which has an excellent waterproof performance and improved connection properties between sheets and adhering properties in a corner area to prevent defects by gaps and cracks, and a construction method thereof. The waterproof sheet according to the present invention comprises: a sheet unit comprising a lower sheet which comprises an insulation absorbing layer on a non-woven fabric and a main waterproof layer located on the insulation absorbing layer and an upper sheet which comprises a first sub waterproof layer located on the main waterproof layer, a fiber mesh layer located on the first sub waterproof layer and a second sub waterproof layer located on the fiber mesh layer; and a wing unit which is extended from at least one side of the upper sheet in a direction parallel to an extension direction of the upper sheet.

Description

Waterproof sheet and its construction method {Waterproof sheet and construction method thereof }

The present invention relates to a waterproof sheet and a construction method thereof, and more particularly, to a waterproof sheet having excellent waterproof performance and improved adhesion between sheets and in corner areas to prevent defects such as lifting and cracking, and It's about how to build it.

In general, a waterproof layer is formed with a waterproof sheet on a road or a roof of a building to prevent aging of a concrete or asphalt substrate surface and to prevent water leakage. The waterproof sheet is used in various buildings because of its simple maintenance work and relatively low cost.

However, in the case of the conventional waterproof sheet, the seam between the sheets is not good, so the gap between the sheets occurs, and the lifting phenomenon occurs in the corner area between the floor and the wall with a relatively high moisture content, resulting in defects such as cracks. There was a problem.

Accordingly, Korean Patent Registration No. 10-0576102 relates to defect repair by attaching a connecting sheet of a certain width along the abutting part of the sheet, sufficiently impregnating the coating composition, spraying silica sand, and finishing with a top coat. technique is described.

However, since the above method requires a separate process of attaching the connecting sheet, the working time is long, the bonding area of the connecting sheet is small, and the adhesive strength and durability of the connecting sheet itself are not excellent. There is a problem in that the connecting sheet is separated when there is pushing or lifting occurs after construction.

In addition, when constructing by connecting several sheets, there is a problem in that larger defects such as water leakage are generated as an empty space is formed due to a step without being completely adhered to each other between the sheets.

(Patent Document 1): Republic of Korea Patent Registration No. 10-0576102

An object of the present invention is to provide a waterproof sheet having excellent waterproof performance and at the same time improving jointness between waterproof sheets and adhesion in corner areas.

In addition, the present invention is to provide a waterproof sheet capable of minimizing contraction and expansion of the waterproof sheet itself after construction.

And the present invention is to provide a waterproof sheet with a low defect rate even in harsh environmental conditions.

Furthermore, the present invention is to provide a method for constructing a waterproof sheet capable of simple waterproof construction.

A waterproof sheet according to the present invention includes a lower sheet including a heat insulation absorbing layer on a nonwoven fabric and a main waterproof layer positioned on the heat insulation absorbing layer; and a top sheet including a first sub waterproof layer positioned on the main waterproof layer, a fiber mesh layer positioned on the first sub waterproof layer, and a second sub waterproof layer positioned on the fiber mesh layer. ; And wings extending in a direction parallel to the extending direction of the top sheet from at least one side of the top sheet; includes

In the waterproof sheet according to an embodiment of the present invention, the wing portion extends continuously to the top sheet, and may form the same thickness as the top sheet.

In the waterproof sheet according to an embodiment of the present invention, the ratio of the width of the sheet portion to the width of the wing portion may be 1:0.01 to 0.1.

In the waterproof sheet according to an embodiment of the present invention, the upper sheet: the thickness ratio of the lower sheet may be 1: 3 to 7.

In the waterproof sheet according to an embodiment of the present invention, the thickness of the waterproof sheet may be 0.2 to 5 mm.

In the waterproof sheet according to an embodiment of the present invention, an adhesive portion coated with an adhesive composition may be further formed on the lower surface of the lower sheet.

In the waterproof sheet according to an embodiment of the present invention, the first sub-waterproof layer, the second sub-waterproof layer, and the fiber mesh layer include a polyolefin-based resin, and the polyolefin-based resin of the first sub-waterproof layer and the second sub-waterproof layer The crystallinity of the polyolefin-based resin of the fiber mesh layer may be higher than the crystallinity of.

In the waterproof sheet according to an embodiment of the present invention, the crystallinity of the polyolefin-based resin of the first sub-waterproof layer and the second sub-waterproof layer is 60 to 70%, and the crystallinity of the polyolefin-based resin of the fiber mesh layer is 75% to 75%. It can be 90%.

In the waterproof sheet according to an embodiment of the present invention, the lattice spacing of the fiber mesh layer may be 0.1 to 3 mm.

The waterproof sheet construction method of the present invention relates to the method of constructing the waterproof sheet described above, and includes the step of adhering the lower surface of the wings of the waterproof sheet to the upper surface of the upper sheet of the adjacent waterproof sheet or to the surface of the object to be waterproofed.

In the waterproof sheet construction method according to an embodiment of the present invention, the bonding may be performed by heating the wing portion.

The waterproof sheet according to the present invention has excellent waterproofness, and through the wings, the joint between the waterproof sheets and the adhesion in the corner area are improved to prevent lifting and defects such as cracks and leaks.

In addition, the waterproof sheet according to the present invention has excellent air permeability and easy discharge of moisture, and has excellent temperature stability, so that its own contraction and expansion are minimized, so that defects due to changes in physical properties of the sheet after construction can be prevented.

In addition, the waterproof sheet according to the present invention has a low defect rate even in harsh environmental conditions in which various external forces such as sunlight exist through excellent durability and weather resistance, so that maintenance and repair of waterproof performance is easy.

Furthermore, the construction method through the waterproof sheet of the present invention does not require a separate connection sheet construction process, thereby reducing construction time and labor, enabling more efficient waterproof construction.

1 is a perspective view showing a waterproof sheet according to an embodiment of the present invention;
2 is a schematic diagram showing a state in which the waterproof sheet shown in FIG. 1 is installed on a waterproof treatment object;
Figure 3 is a schematic diagram showing the seam portion of the waterproof sheets shown in Figure 1.

Unless otherwise defined, the technical and scientific terms used in this specification have meanings commonly understood by those of ordinary skill in the art to which this invention belongs, and the gist of the present invention in the following description and accompanying drawings Descriptions of known functions and configurations that may unnecessarily obscure are omitted.

In addition, the singular form used in this specification may be intended to include the plural form as well unless otherwise indicated in the context.

In addition, units used in this specification without special mention are based on weight, and as an example, the unit of % or ratio means weight% or weight ratio, and unless otherwise defined, weight% is any one component of the entire composition It means the weight percent occupied in the composition.

Further, as used herein, numerical ranges include lower and upper limits and all values within that range, increments logically derived from the shape and breadth of the defined range, all values defined therebetween, and the upper limit of the numerical range defined in a different form. and all possible combinations of lower bounds. Unless otherwise specifically defined in the specification of the present invention, values outside the numerical range that may occur due to experimental errors or rounding of values are also included in the defined numerical range.

The term 'comprising' in the present specification is an open description having the same meaning as expressions such as 'includes', 'includes', 'has' or 'characterized by', elements not additionally listed, No materials or processes are excluded.

The waterproof sheet of the present invention includes a lower sheet including a heat insulating absorbent layer on a nonwoven fabric, and a main waterproof layer positioned on the heat insulating absorbent layer; and a top sheet including a first sub waterproof layer positioned on the main waterproof layer, a fiber mesh layer positioned on the first sub waterproof layer, and a second sub waterproof layer positioned on the fiber mesh layer; And wings extending in a direction parallel to the extending direction of the top sheet from at least one side of the top sheet; includes

Conventional waterproof sheets have a problem in that defects such as leaks and cracks occur due to poor seamness between sheets, resulting in widening between sheets and lifting in the corner area between the floor and the wall with a relatively high moisture content. .

Therefore, in order to prevent the spread between the sheets, the sheets are overlapped or used by attaching a connecting sheet of a certain width along the abutting part of the sheets, but when the sheets are overlapped with each other, due to the thickness of the sheets, There was a disadvantage in that an empty space was formed due to the step and leakage occurred.

In addition, when attaching a connecting sheet of a certain width along the part where the sheets meet, a separate process for attaching the connecting sheet is required, so the working time is long, the bonding area of the connecting sheet is small, and the bonding strength is not high. Therefore, there is a problem that the sheet is pushed during construction or the connection sheet is separated due to the appearance of lifting after construction.

In addition, the construction methods as described above are still difficult to construct in the corner area with a high moisture content, and even if they are constructed, they cannot prevent the occurrence of a lifting shape, so there is a disadvantage in that a separate waterproofing process for the corner area is further performed.

However, the waterproof sheet according to the present invention includes a seat portion and a wing portion, and forms an upper surface on the same plane as the seat portion and covers and adheres the seam portion between the waterproof sheets through the extended wing portion, such as between a wall and a floor. Since the corner area can be covered and closely adhered, it is possible to perform waterproof construction easily and flawlessly even in the joint and corner area between waterproof sheets with high adhesive strength.

In addition, the waterproof sheet according to the present invention has a structure in which a heat insulation absorption layer-main waterproof layer-first sub waterproof layer-fiber mesh layer-second sub-radiation layer are sequentially stacked, and through such a structure, not only exhibits excellent durability and waterproof performance In addition, it has excellent air permeability and is easy to discharge moisture, enabling stable construction without lifting even in corner areas with high moisture content. It is possible to prevent the occurrence of defects due to changes in physical properties of

1 shows a waterproof sheet according to an embodiment of the present invention.

Hereinafter, a waterproof sheet according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. The accompanying drawings are provided by way of example in order to sufficiently convey the technical spirit of the present invention to those skilled in the art, and the present invention is not limited to the drawings presented below.

Referring to FIG. 1, a waterproof sheet 1 according to the present invention includes a seat portion 100 and wing portions 300.

Specifically, the sheet portion 100 includes a lower sheet 10 whose bottom surface is adhered to the surface of the object to be waterproofed, and an upper sheet 30 positioned on the lower sheet 10 . In the lower sheet 10, the heat insulation absorption layer 11 - the main waterproof layer 13 are sequentially stacked, and the upper sheet 30 has a first sub waterproof layer 31 - a fiber mesh layer 33 - a second sub waterproof layer 35 ) is a sequentially stacked structure. That is, the seat portion 100 has a structure in which the heat insulation absorption layer 11 - the main waterproof layer 13 - the first sub waterproof layer 31 - the fiber mesh layer 33 - the second sub waterproof layer 35 are sequentially stacked. can The sheet portion 100 having such a structure not only exhibits excellent waterproof performance, but also has excellent air permeability and easily discharges moisture, enabling stable construction without lifting even in a corner area with a high moisture content.

The waterproof sheet 1 is not limited as long as it can have excellent waterproof performance, but may be preferably 0.2 to 5 mm, more preferably 1 to 3 mm. At this time, the thickness ratio of the upper sheet 30: the lower sheet 10 is 1: 3 to 7, specifically 1: 4 to 6, and in the above range, it has excellent durability but exhibits high flexibility, so that various shapes of waterproof treatment objects It can be installed in close contact without lifting.

In detail, the heat insulating absorption layer 11 can absorb moisture generated from the surface to be waterproofed to function as heat insulation and keeping warm. Although not limited, for example, those made of any one fiber selected from the group consisting of polyester, polyethylene and polypropylene may be used. The thickness of the heat insulating absorption layer 11 is in the range of 0.5 to 5 mm, specifically 1 to 3 mm, more specifically 1.5 to 2 mm, and the effect of heat insulation and keeping warm is advantageous.

The heat insulating absorption layer 11 may use a material having a basis weight of 50 to 200 g/m 2 , specifically 100 to 150 g/m 2 , but is not limited thereto. However, since the heat insulating absorbent layer 11 having the basis weight range can effectively discharge and absorb gas, air and moisture generated from the surface to be waterproofed, it has the advantage of minimizing shrinkage and expansion of the waterproof sheet 1. . Accordingly, it is possible to prevent lifting and cracking after the waterproof sheet 1 is constructed.

The heat insulating absorption layer 11 may further include additives to improve adhesion with the main waterproof layer 13 . For example, it may include ethylene vinyl acetate having a density of 0.925 to 0.950 g/cm 3 or polyethylene wax having a density of 0.940 to 0.950 g/cm 3 . By including the additive, it is possible to further improve durability while maintaining flexibility of the waterproof sheet 1 by improving adhesion with the main waterproof layer 13 .

In addition, the heat insulating absorption layer 11 may include a conventional flame retardant to improve flame retardancy. For example, an ammonium-based flame retardant such as ammonium phosphate, diammonium hydrogen phosphate, ammonium sulfate, or the like, or an antimony-based flame retardant such as antimony trioxide may be used. The flame retardants may be used alone or together with other additives that increase the flame retardant effect of these flame retardants. For example, antimony trioxide can be added in combination with a chloride such as chlorinated paraffin.

As shown in the drawing, the heat insulating absorption layer 11 may have a single-layer structure formed of only a single non-woven fabric, but may have a multi-layer structure formed by thermally compressing a plurality of non-woven fabrics. As an example of the multilayer structure, the heat insulating absorption layer 11 may be formed by thermally bonding a second nonwoven fabric having a basis weight of 50 to 150 g/m 2 to one or both sides of a first nonwoven fabric having a basis weight of 100 to 200 g/m 2 .

The main waterproof layer 13 is located on the heat insulating absorption layer 11, and is not limited to any resin having waterproof ability, but examples thereof include polyvinyl chloride, thermoplastic polyurethane elastomer, low-density polyethylene, medium-density polyethylene, high-density polyethylene, and polyvinyl chloride. It may be any one sheet selected from the group consisting of propylene and silicone-based resins. Advantageously, the use of polyvinyl chloride is good in terms of flexibility. The thickness of the main waterproof layer 13 is not limited as long as it can have sufficient waterproof ability, but may have high flexibility and waterproof ability in the range of 0.1 to 1.5 mm, specifically, 0.3 to 1 mm.

The lower sheet 10 in which the above-described heat insulating absorption layer 11 and the main waterproof layer 13 are laminated may have an average thickness of 1 to 5 mm, and have flexibility in the above range, and at the same time, the heat insulating absorption layer 11 and the main waterproof layer ( 13) has excellent adhesion, mechanical strength and durability.

The upper sheet 30 is located on the lower sheet 10, serves to protect the lower sheet 10, and the first and second sub-waterproof layers 35 on the upper and lower surfaces of the fiber mesh layer 33. ) is positioned and heat-pressed to form a sandwich in which the fiber mesh layer 33 is embedded between the first and second sub-waterproof layers. The upper sheet 30 having such a structure has high flexibility, improved durability and weather resistance, and may have excellent adhesion to the lower sheet 10 . In particular, as the fiber mesh layer 33 is positioned between the first and second sub-waterproof layers 31 and 35, the tissue strength of the top sheet 30 is strengthened and tensile and elongational forces are suppressed so that the top sheet 30 Features to prevent warping

The first sub-waterproof layer 31, the second sub-waterproof layer 35, and the fiber mesh layer 33 of the top sheet 30 include polyolefin-based resin, preferably polyethylene resin, more preferably high-density polyethylene ( HDPE) resin. Such an upper sheet 30 has excellent flexibility and durability as well as waterproof performance, and thus can maintain waterproof performance without repair work of the waterproof sheet 1 for a long time.

Advantageously, the first sub-waterproof layer 31 and the second sub-waterproof layer 35 are the same, the polyolefin-based resins of the first sub-waterproof layer 31 and the second sub-waterproof layer 35 have the same crystallinity, and the fiber mesh layer The polyolefin-based resin of (33) may have higher crystallinity than the crystallinity of the polyolefin-based resins of the first sub-waterproof layer 31 and the second sub-waterproof layer 35. When the top sheet 30 including the first and second sub-waterproof layers 31 and 35 and the fiber mesh layer 33 is thermally compressed, the shape of the fiber mesh layer 33 is maintained, and the fiber mesh layer The first and second sub-waterproof layers 35 are heat-sealed to each other in the lattice portion of (33), that is, in the empty space. Thus, the top sheet 30 is not twisted even after thermal compression, and the adhesion between layers is very excellent.

Specifically, the first sub-waterproof layer 31 and the second sub-waterproof layer 35 are high-density polyethylene resin having a crystallinity of 60 to 70%, and the fiber mesh layer 33 is a high-density polyethylene resin having a crystallinity of 75% to 90%. can be fibres. This top sheet 30 has excellent compatibility between adjacent layers, so it has excellent interlayer adhesion and can prevent separation even under harsh environmental conditions. In addition, such an upper sheet 30 does not require the use of a separate adhesive or solvent, and each layer in the form of a sheet in the order of the first sub waterproof layer 31 - the fiber mesh layer 33 - the second sub waterproof layer 35 Manufacture is possible only by thermal compression after the lamination, and as the interlayer adhesion of the manufactured top sheet 30 is excellent, it is possible to easily provide a high-quality, eco-friendly waterproof sheet 1. In addition, as it has excellent temperature stability, its own contraction and expansion are minimized, so that after construction, defects due to changes in physical properties of the sheet, such as distortion, can be prevented.

The degree of crystallinity of the present invention can be obtained by raising the temperature from a temperature of 30 ° C. at a heating rate of 10 ° C./min using a differential scanning calorimeter and measuring it.

The thickness of the above-described first sub-waterproof layer 31 and the second sub-waterproof layer 35 may be 0.05 to 0.5 mm, specifically, 0.1 to 0.3 mm, but is not limited thereto. However, it is possible to maintain waterproof performance and excellent flexibility within the above range.

The fiber mesh layer 33 is not limited, but preferably has a basis weight of 60 to 100 g/m 2 and a lattice spacing of 0.1 to 3 mm, specifically 0.3 to 1 mm, and more specifically 0.5 to 0.9 mm. Within the above range, the area where the first sub-waterproof layer 31 and the second sub-waterproof layer 35 are heat-sealed to an extent that can improve the strength of the top sheet 30, prevent distortion, and have excellent interlayer adhesion can be determined. can have In addition, the thickness of the fiber mesh layer 33 may be 0.01 to 0.4 mm, specifically, 0.05 to 0.2 mm, but is not limited thereto. However, while maintaining excellent flexibility within the above range, it is possible to prevent distortion.

The top sheet 30 in which the above-described first and second sub-waterproof layers 35 and the fiber mesh layer 33 are laminated may have an average thickness of 0.1 to 1 mm, and have flexibility within the above range, and at the same time, adhesion between layers, Excellent mechanical strength and durability.

The wing portion 300 extends continuously to the top sheet 30 described above, and forms the same thickness as the top sheet 30 . That is, the wing part 300 forms an upper surface on the same plane as the seat part 100 and extends, and is covered at the joint between the waterproof sheets 1 or covered at the corner area such as between the wall and the floor to each part. can be sealed.

The wing part 300 is not limited as long as it has a width that can sufficiently cover the seam between the waterproof sheets 1 and the corner area of the waterproof treatment target, but preferably the width of the sheet part 100: the width of the wing part 300 The ratio may be 1:0.01 to 0.1, specifically, 1:0.03 to 0.08. With excellent adhesive strength compared to the width of the wings 300, it is possible to seal the seam and the corner area of the waterproof treatment target.

In one embodiment of the present invention, the waterproof sheet 1 may further form an adhesive portion coated with an adhesive composition on the lower surface of the lower sheet 10 or the lower surface of the wing portion 300. The adhesive composition may include polyester-urethane adhesives, polyether-urethane adhesives, polyurethane adhesives, acrylic adhesives, epoxy adhesives, polyolefin adhesives, elastomer adhesives and fluorine adhesives, and preferably polyurethane adhesives and acrylic adhesives. Adhesives and polyolefin based adhesives may be used.

In one embodiment of the present invention, of course, a separate UV protection layer for UV protection may be further formed on the top sheet 30.

The waterproof sheet construction method according to the present invention relates to the above-described waterproof sheet construction method, and includes the step of adhering the lower surface of the wings of the waterproof sheet to the upper surface of an adjacent waterproof sheet or to the surface of an object to be waterproofed. Such a construction method does not require a separate connection sheet construction process, thereby reducing construction time and labor, thereby enabling more efficient waterproof construction.

2 to 3 are schematic diagrams showing the appearance after the waterproof sheet 100 shown in FIG. 1 is constructed.

Specifically, FIG. 2 shows a state in which the waterproof sheet shown in FIG. 1 is constructed in a corner region of an object to be waterproofed.

Referring to Figure 2, through the construction method of the present invention, the bottom surface of the seat portion 100 of the waterproof sheet is adhered to the bottom (G) of the waterproof treatment object, and the bottom surface of the wing portion 300 is the wall (W) of the waterproof treatment object ), the waterproof sheet can be applied in close contact with the object to be waterproofed.

In addition, FIG. 3 shows a state in which the waterproof sheets shown in FIG. 1 are installed adjacent to each other. Specifically, FIG. 3 (a) is a waterproof sheet of the present invention, and FIG. 3 (b) shows a state in which a conventional waterproof sheet is installed.

Referring to FIG. 3, through the construction method of the present invention, the lower surface of the wing portion 300 of the waterproof sheet is adhered to the upper surface of the sheet portion 100 of the adjacent waterproof sheet, and when the waterproof sheets are mutually constructed, the waterproof sheet It is possible to install the waterproof sheet in close contact without widening the seam. However, in the case of the conventional waterproof sheet 200, it can be seen that a large step difference occurs in the overlapping portion.

In one embodiment of the present invention, the waterproof sheet may be bonded by the above-described bonding unit, but the wing unit 300 may be bonded at the seam by heating the wing unit 300.

Specifically, as described above, since the top sheet has a structure in which the fiber mesh layer is located between the first and second sub-waterproof layers, the wings extending from the top sheet also have the same structure. That is, the lower surface of the wing part 300 is made of the first sub-waterproof layer. Accordingly, as shown in FIG. 3, when the bottom surface (first sub-waterproof layer) of the wing portion 300 of one waterproof sheet is in contact with the upper surface (second sub-waterproof layer) of the sheet portion 100 of the adjacent waterproof sheet, Since the first sub-waterproof layer and the second sub-waterproof layer contain the same polyolefin-based resin, they can be bonded with high adhesive strength through heating without a separate adhesive. Accordingly, it is possible to more easily and environmentally friendly waterproof construction.

Hereinafter, the present invention will be described in detail through examples, but these are for explaining the present invention in more detail, and the scope of the present invention is not limited by the following examples.

(Example 1)

Polypropylene (H7700, LG Chem) filament fibers were spun to form a multi-layered web on a continuously moving belt to have a basis weight of 150 g/m2, followed by thermal compression to prepare a first nonwoven fabric having an average thickness of 1.8 mm. Here, a PVC film having an average thickness of 0.7 mm was thermally bonded to prepare a lower sheet having a total thickness of 2.5 mm.

High-density polyethylene (crystallinity 87%) sheets with an average thickness of 0.1mm, basis weight of 70g/m2 and lattice spacing of 0.7mm are thermally compressed on both sides of the fiber mesh layer with a high-density polyethylene (crystallinity of 70%) sheet with an average thickness of 0.2mm. A top sheet having a thickness of 0.5 mm was prepared.

The upper sheet was formed to be 6 cm longer than the lower sheet in the width direction, and then bonded to the lower sheet to prepare a waterproof sheet forming a wing portion on one side.

After applying polyurethane adhesive to the lower surface of the wings of the prepared waterproof sheet, as shown in FIG. 3 (a), two waterproof sheets were attached. Thereafter, the adhesive strength was measured using a universal testing machine under a test speed of 50 mm/min measurement condition, and is shown in Table 1 below.

(Comparative Example 1)

In Example 1, the adhesive strength was measured in the same manner as in Example 1, except that a waterproof sheet of another company (EPDM, VERSICO) was attached as shown in FIG. 3 (b) instead of the waterproof sheet of the present invention.

(Comparative Example 2)

In Example 1, the adhesive strength is the same as in Example 1, except that a waterproof sheet of another company (kB composite air sheet, kb waterproof) is attached as shown in FIG. 3 (b) instead of the waterproof sheet of the present invention. measured.

(Experimental Example)_Evaluation of adhesive strength

The adhesive strength test was evaluated by applying the test method of KS M 3705: 2015.

(1) Measurement of adhesive strength (untreated)

Fix the test pieces of Examples and Comparative Examples to the clamp of the universal testing machine at room temperature (80 ± 2 ° C), and the long axis of the test piece and the center line of the clamp are on a straight line, and the load is correctly passed over the line, so that the load is and record the maximum load until the specimen fails at a test speed of 3.92 kN/min.

(2) Heat resistance test

The test pieces of Examples and Comparative Examples were heat treated for 168 hours at a temperature of 80 ± 2 ° C., stored for 4 hours or more in a standard state, and then the adhesive strength was measured by the adhesive strength measurement method.

(3) Alkali resistance test

The test pieces of Examples and Comparative Examples were immersed in a 0.1% aqueous solution of sodium hydroxide special grade product at 20 ± 2 ° C., calcium hydroxide first grade product was saturated, and the test piece was immersed for 168 hours. After storage for more than an hour, the adhesive strength was measured by the adhesive strength measurement method.

(4) Weather resistance test

The test pieces of Examples and Comparative Examples were exposed to a carbon arc lamp for 250 hours by applying the test method of KS F 2274: 2018 to condition treatment, and then stored for 4 hours or more in a standard state. The adhesive strength was measured by the above adhesive strength measurement method. .

division unit Measures Example 1 Comparative Example 1 Comparative Example 2 Untreated adhesive strength MPa 0.31 0.18 0.15 Heat treatment (80±2℃)
adhesive strength MPa 0.24 0.10 0.14 Adhesive strength after alkaline solution treatment MPa 0.28 0.15 0.12 Adhesion strength after freeze-thaw treatment (Method B, 100 times) MPa 0.23 0.13 0.10 After weather resistance (carbon arc, 250 hours) test
adhesive strength MPa 0.25 0.19 0.13

Through the above Table 1, it was confirmed that the waterproof sheet according to the present invention improves the adhesive strength in the joint area between the waterproof sheets through the wings, and has excellent temperature stability, durability and weather resistance, so that harsh Even in the environment, it was confirmed that excellent adhesive performance was maintained by minimizing its own shrinkage and expansion. As described above, the present invention has been described by specific details and limited examples and drawings, but this helps a more general understanding of the present invention. It is only provided for, the present invention is not limited to the above embodiments, and those skilled in the art can make various modifications and variations from these descriptions.

Therefore, the spirit of the present invention should not be limited to the described embodiments, and it will be said that not only the claims to be described later, but also all modifications equivalent or equivalent to these claims belong to the scope of the present invention. .

1: waterproof sheet
10: lower seat
11: heat absorption layer
13: main waterproof layer
30: top sheet
31: first sub waterproof layer
33: fiber mesh layer
35: second sub waterproof layer
100: seat portion
300: wing part

Claims (11)

A lower sheet comprising a heat insulating absorption layer on a nonwoven fabric and a main waterproof layer positioned on the heat insulating absorption layer; and a top sheet including a first sub waterproof layer positioned on the main waterproof layer, a fiber mesh layer positioned on the first sub waterproof layer, and a second sub waterproof layer positioned on the fiber mesh layer. ; and
Wings extending from at least one side of the top sheet in a direction parallel to the extending direction of the top sheet; including,
The first sub waterproof layer, the second sub waterproof layer and the fiber mesh layer include polyolefin resin,
The crystallinity of the polyolefin-based resin of the fiber mesh layer is higher than the crystallinity of the polyolefin-based resin of the first sub-waterproof layer and the second sub-waterproof layer, waterproof sheet.
According to claim 1,
The wing portion extends in succession to the top sheet, and forms the same thickness as the top sheet, waterproof sheet.
According to claim 1,
The ratio of the width of the seat portion: the width of the wing portion is 1: 0.01 to 0.1, the waterproof sheet.
According to claim 1,
The upper sheet: the thickness ratio of the lower sheet is 1: 3 to 7, waterproof sheet.
According to claim 1,
The waterproof sheet has a thickness of 0.2 to 5 mm. The waterproof sheet according to claim 1, wherein an adhesive portion coated with an adhesive composition is further formed on the lower surface of the lower sheet.
delete According to claim 1,
The crystallinity of the polyolefin-based resin of the first sub-waterproof layer and the second sub-waterproof layer is 60 to 70%,
The crystallinity of the polyolefin-based resin of the fiber mesh layer is 75% to 90%, waterproof sheet.
According to claim 1,
The lattice spacing of the fiber mesh layer is 0.1 to 3 mm, waterproof sheet
In the method of constructing the waterproof sheet of any one of claims 1 to 6, 8 and 9,
Adhering the lower surface of the wings of the waterproof sheet to the upper surface of the upper sheet of the adjacent waterproof sheet or to the surface of the object to be waterproofed;
According to claim 10,
The bonding is performed by heating the wing portion, the waterproof sheet construction method.

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