JPS58777B2 - roof waterproofing material - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a roof waterproofing material used for roof waterproofing of buildings made of concrete, etc., and more particularly to a waterproofing material used in an exposed waterproofing method using a soft vinyl chloride resin.

Conventionally, waterproof sheets made of soft vinyl chloride resin have been widely used in exposed waterproofing construction methods.

The reason for this is: ■The integrated waterproofing method, such as adhesion and welding, is superior to rubber sheets.

■Since it is a soft material, it has a high ability to adapt to the underlying clutch.

■Because it is an exposed construction method, if defects such as water leakage occur, they can be easily detected by inspecting the joint closures and drain areas.

■Roofs that involve walking (rooftop sports fields, etc.) must be waterproof.

■It must be aesthetically pleasing.

■Since the raw material itself is inexpensive, it is possible to make the sheet material thicker, resulting in reliability.

There are many advantages such as: However, the soft vinyl chloride resin roof waterproofing material, which has these excellent properties, also has major drawbacks.

The reason is that the waterproof material is soft.

That is, in order to soften the vinyl chloride resin, a large amount of a liquid softener called a plasticizer is used.

This plasticizer exists in PVC resin and has the role of softening it, but at the same time, over a long period of time, it is gradually lost by volatilization from the surface of the waterproofing agent and washed away by rainwater, gradually hardening, and at the same time its loss. Constitutional shrinkage occurs by the amount of plasticizer added.

This shrinkage in the roof waterproofing material causes a very fatal drawback.

That is, the joints may break or the rising portion may be damaged, causing water leakage.

Once the waterproofing material is in this state, it is no longer possible to make partial repairs, and a complete redo is required.

Further, in the case of a sheet hardened in this manner, the ability to adapt to the occurrence of cracks in the underlying concrete layer is lost, and the sheet loses its original characteristics.

The present invention aims to provide a new waterproofing agent that eliminates the drawbacks of soft vinyl chloride resin roof waterproofing materials.
To explain this embodiment with reference to the drawings, the back side of the top sheet 1 which is mainly composed of soft vinyl chloride resin and has high elongation and tensile strength, has the same physical properties as the top sheet 1, that is, both elongation and tensile strength, or Buffer layer with one of the physical properties is small 2. A roof waterproofing material A is formed by laminating a heat-sensitive adhesive acrylic resin film 4 on the surface of a roofing waterproof sheet 9 which is formed by laminating a backing material 3 such as a woven fabric on the lower surface of the buffer layer 2, and this As a first method for fully demonstrating the characteristics of waterproofing material A, when applying this roofing waterproofing material A to the roof of a building made of concrete, etc., the joints are made into overlap joints, and the overlapped portions 5. That is, the front surface of the layered roofing material A and the back surface of the layered roofing board material A' are heated and activated with hot air, and then pressed with a roller or the like to weld them.
There is a roof waterproofing construction method characterized by directly attaching the end of the shed board to the shed board with a welding rod 6, and as a second method, the roof waterproofing material A is applied to the roof of a building such as concrete. During construction, the joints are butted, and both roofing materials A are used.

Layer the welding tape 7 on the top surface of A', activate the overlapping parts, that is, the surfaces of both roof waterproofing materials A and A', and the back side of the welding tape 7 with hot air, and then press with a roller or the like to weld. There is a roof waterproofing construction method characterized by An elastic sealant 8 having adhesive properties is placed on the upper surface of the abutting part, and a welding tape 7' is coated on top of it, and the overlapping part 5, 5 of the roof waterproofing material A and the welding tape 7, that is, both roofing materials are abutted. The surfaces of A and A' and the back surface of the tape 7' are activated by heating with hot air, and then pressed with a roller or the like to weld, and then the tape 7 is
There is a roof waterproofing construction method characterized by welding the end of the roof waterproofing material integrally with the roof waterproofing material using a welding rod 6.

The top sheet 1 is a sheet-like material whose main component is soft vinyl chloride resin, and has an elongation of about 300% and a tensile strength of 15.
The layer has a relatively large elongation and tensile strength of about 20 kg/2 x 5 mm, and has excellent physical properties in terms of quality.

However, it is clear that this "excellent physical property" is not limited to the above values; it is of course possible to design a value higher than this, or a design with the same tensile strength and greater elongation. , something that can be done freely.

The buffer layer 2 has two properties: a buffer layer relative to the top sheet 1 and a buffer layer in an absolute sense as a roof waterproofing material, but if defined in a strict sense, it is a buffer layer relative to the top sheet 1.
It is necessary that the physical properties of the topsheet 1, that is, both elongation and tensile strength, or either one of them, be smaller than the value of the topsheet 1.

This is an extremely important factor when using an exposed waterproofing method, particularly when a soft vinyl chloride resin sheet is used in the method.

That is, the waterproof layer in a typical building compensates for the defects of the underlying material, that is, the material that makes up the roof of the building.

For example, in the case of a concrete building, the roof is also made of concrete (in many cases, it is made of concrete unit plates such as ALC board or Civolex), but this concrete is very prone to cracking, and the building is not watertight. Unable to maintain sexuality.

Therefore, various waterproofing materials have been developed as a way to compensate for this drawback.

However, the waterproofing materials that are manufactured need to be designed to suit the unique problems of these buildings, such as cracks and the way the cranks enter. Characteristics that correspond to that movement are required.

In other words, these waterproof materials are generally integrally bonded or bonded to the roof frame of a building, but if a crank or crack occurs in the roof frame of such a structure, the part where the crank or crack occurred will be damaged. very large stress,
Deformation occurs intensively.

That is, since the displacement from the bonded state to the cranked state is theoretically infinite, the waterproof material is required to stretch infinitely at the cranked point.

However, in manufacturing, it is important to have a buffer layer that prevents these displacements and concentrated stresses from spreading to the surface layer, that is, a layer that alleviates deformation and disperses concentrated stresses.

In other words, when a certain displacement or concentrated stress is applied, it breaks itself when it reaches a certain degree of deformation, and has the effect of preventing the transmission of those deformations and stress from spreading to other parts. This is the role of the back layer laminated on the top.

In this respect, the back layer, that is, the buffer layer, is required to be a layer inferior in elongation and tensile strength to the surface layer.In this respect, the design of the quality of the buffer layer 2 of the present invention is determined in relation to the top sheet 1. However, in reality, a backing material 3 such as coarse linen cloth, woven fabric such as vinylon cloth, resin-impregnated nonwoven fabric, etc. is laminated on the back surface of the buffer layer 2.

A heat-sensitive acrylic resin film 4 is laminated on the surface of the three-layer structure sheet 9 constructed in this manner.

This heat-sensitive means that it can be easily laminated integrally with the soft vinyl chloride resin sheet 1 on the surface without an adhesive by heat. It can be said to be a film that exhibits adhesive properties.

Such films are made of synthetic resins mainly composed of acrylic polymers, such as copolymers of ethyl acrylate and butyl acrylate, so-called MBS resins made by graft copolymerizing polybutadiene with methyl methacrylate and styrene, or synthetic resins containing acrylic polymers as the main component, or mixtures thereof. It's a film.

These films are easily activated at 80 to 150°C, and are heated while contacting a heating roll that has been preheated to 100 to 180°C. They can be integrally laminated by contacting and pressing the surfaces.

The thus obtained four-layer laminated structure sheet A has the following characteristics.

First of all, because the acrylic film is laminated on the surface, there is no volatilization of the plasticizer from the sheet surface or washing away by rainwater, which eliminates shrinkage due to aging, which was the biggest drawback of soft PVC resin sheets. Therefore, there is no joint rupture associated with this, and water leakage accidents are also eliminated.

This skillfully utilizes the properties of heat-sensitive acrylic resin film.

Furthermore, when such a waterproofing material is applied to the roof of an actual concrete building, it is necessary to close the joints in the horizontal direction of the sheet, and it exhibits a very unique effect in closing the joints.

That is, the construction methods that maximize the characteristics of the waterproofing material of the present invention include the lap joint method shown in Figure 2, the tape joint method shown in Figure 3, and the tape welding method shown in Figure 4. There are three methods: welding method (sealant tape joint method).

In other words, the common construction method among these construction methods, that is, the construction method that takes advantage of the characteristics of the waterproof material of heat-sensitive acrylic film lamination, is the overlapped portion of sheets or the overlapped portion of tape and sheet5.
That is, in FIG. 2, the front side of sheet A and the back side of sheet A', and in FIGS. 3 and 4, the back side of tape 7 or 7' and the front side of sheets A and A' are heated with hot air. By simultaneously heating the material to a thermally activated state and pressing and welding it with a metal roller, it is possible to integrate joints over a wide range without using any adhesive.

The features of this construction method are that no welding agent is required, that it is possible to integrate over a wide width, eliminating joint breakage, that there is no shallow water from the joints, and because no adhesive is used, the ends of the overlapping parts There is no danger of ignition during welding, and there is no welding interference due to adhesive extrusion.

In addition, during this welding method, especially in the case of the ramp joint method shown in Figure 2, it is necessary to weld the back of the notebook to the surface of the sheet. When a cloth is used, the soft vinyl chloride resin is exposed from the coarse spacing of the cloth, and the exposed portions are welded to the pressure-sensitive acrylic film, allowing effective construction even in the presence of a backing material.

The tape joint construction method shown in Figure 3 is used for concrete buildings that have relatively little shaking or vibration, or for AL
This construction method is suitable for cases where concrete unit plates such as C plates and Civolex are not used as the roof structure, that is, when the concrete base is an internal structure.

The sealant tape joint construction method shown in Figure 4 is suitable for use in buildings where the roof frame is made of unit molded plates such as ALC boards, Cibolex boards, wood wool boards, etc., and where deformation or displacement of unit boards is involved. It is a construction method.

In other words, even if a large displacement occurs, the adhesiveness and elasticity of the sealant will first maintain watertightness, and even if a significant displacement occurs that causes the overlapped portion 5 to break, in the worst case, the adhesiveness of this sealant will This method maintains water-like properties and is an extremely effective method for such structures.

Next, specific examples of the present invention will be described.

Example 1 (1) Lamination composition of buffer layer■ PVC resin (P=800) 100 DOP 40 Salt Para
30 stabilizer
6.0 Filler (light calcium carbonate) 1
50 A buffer layer of the above formulation (3) was laminated to a thickness of 1.05 mm on linen cloth (18 warp yarns x 18 weft yarns: number of yarns per inch) that had been subjected to sizing treatment in advance.

In this case, the elongation and tensile strength of the linen fabric and buffer layer were as follows.

Elongation (%) Tensile strength kg・2×5cm) Linen cloth 25
5*1 Buffer layer 215 6.0 *Tested with base fabric width 5mm (2) Lamination composition of top sheet■ PVC resin (Pm2O3) 100DOP
50 stabilizer
8 Filler (light carbonaceous carbon) 20 Ultraviolet absorber 1.0 On the top surface of the laminate obtained in the step (1) above, the top sheet of the above formulation (3) was rolled and laminated with a calender to a thickness of 0.8 mm.

The physical properties of the top sheet itself were as follows.

Elongation (%) Tensile strength kg・2×5cm) Surface sheet
317 16(3) Acrylic film lamination formulation ■ Kane Ace FM 100 Distilled stearic acid 0.5 Antioxidant
0.5 The above mixture ■ is 0 on a calendar.
．． A film rolled to a thickness of 1 mm, cooled, and wound up is laminated on the laminated sheet obtained in the above step using a heated roll method.

As shown in FIG. 5, the roll 9 has the top sheet 1. obtained in step (2). A laminated sheet consisting of a buffer layer of 2 degrees and linen cloth of 3.
This is heated to about 130 to 140° C. by an electric heater 10 and introduced between press rolls 11 and 12.

The acrylic film 4 rolled in step 3 is
The laminated sheet is integrally laminated while being brought into contact with a metal roll 11 heated to 50° C. as shown in the figure.

After being laminated, they are cooled by a cooling roll 13 to form a waterproof sheet A.

The present invention has a soft vinyl chloride resin as the main component, and has a surface sheet with high elongation and tensile strength on the bottom surface, which is the same as the top sheet, but has physical properties such as elongation and/or tensile strength of the top sheet. Provides a buffer layer with a small
A backing material such as woven fabric is provided on the lower surface of the buffer layer to form a laminated sheet, and a heat-sensitive adhesive acrylic resin film is laminated on the upper surface of the top sheet of this laminated sheet. When used, it exhibits its characteristics extremely effectively.

That is, the first feature of the roof waterproofing material of the present invention is that in any construction method, the surface of the roofing waterproofing material is activated by heating, has excellent weather resistance, and has a surface sheet etc. Because there is an acrylic film that has the ability to shield the plasticizer contained in the soft vinyl chloride resin, other sheets such as the back side of the other sheet A in FIG. 2 and the tape 7 in FIG. Since the tape 7' shown in FIG. 4 and the entire surface welding 5 can be easily obtained, conventional bonding methods are completely unnecessary.

The second feature of the roof waterproofing material of the present invention is that the top surface of the roofing waterproofing material is covered with an acrylic resin film, which prevents volatilization of the plasticizer contained in the soft vinyl chloride resin and prevents runoff due to rainwater. As a result, shrinkage due to aging and joint breakage caused by this can be prevented.

The third feature of the roof waterproofing material of the present invention is that it has a top sheet that basically has excellent elongation and tensile strength, and a top sheet that is of the same quality as this top sheet but has both or both of the elongation and tensile strength. The sheet is made of a three-layer structure consisting of a buffer layer, one of which has small physical properties, and a backing material such as woven fabric, so it is extremely easy to adhere to the roof structure (effect of the backing material), and at the same time cracks occur in the roof structure. In this case, the zero span tension caused by the crack causes the buffer layer to break or break quickly, relieving the concentrated stress, thereby reducing the impact on the surface sheet, which is important for roof waterproofing (effect of the buffer layer).

[Brief explanation of drawings]

The drawings show embodiments of the present invention. Figure 1 is a sectional view of the roof waterproofing material, Figures 2 to 4 are sectional views of the construction state, and Figure 5 is a sectional view of the laminated sheet with the film. It is an explanatory diagram, in which 1 is a top sheet, 2 is a buffer layer, 3 is a backing material,
4 is an acrylic resin film, 5 is an overlapping portion, 6 is a welding rod, 7 is a welding tape, and 8 is an elastic sealant.

Claims (1)

[Claims] 1. On the bottom surface of the top sheet, which is mainly composed of soft vinyl chloride resin and has high elongation and tensile strength, is a buffer material that is the same as the top sheet but has low elongation and/or tensile strength. A roof waterproofing material characterized in that a heat-sensitive adhesive acrylic resin film is laminated on the upper surface of a top sheet of a laminated sheet having a layer and a backing material such as woven fabric provided on the lower surface of the buffer layer.