JP2010082903A - Method for bonding vulcanized rubber sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for bonding a vulcanized rubber sheet, in which the bonding of sheets can be carried out by arranging a fusion material at the end of an overlapped part in the sheet in the same way as a sheet consisting of a thermoplastic resin in bonding the vulcanized rubber sheets. <P>SOLUTION: While the fusion material 5 comprising the thermoplastic resin is melt-extruded in a state that the ends of the vulcanized rubber sheets 1a and 1b are mutually overlapped, the molten fusion material 5 is arranged so as to step over both sheets in the end 4 in which the vulcanized rubber sheets 1a and 1b are overlapped, to bond the vulcanized rubber sheets mutually. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention is a sheet generally called a waterproof sheet laid on the rooftop of a building or the like, and a sheet called a water shielding sheet used in a waste disposal site or a reservoir, and is made of vulcanized rubber. In particular, the present invention relates to a method for joining sheets by heat fusion by using a fusion material made of a thermoplastic material.

  Conventionally, waterproof sheets and water shielding sheets have been installed so that the sewage from the waste will not penetrate into the soil and contaminate the soil at the waste disposal site or at the waste disposal site. Something such as blocking the water is done.

  Examples of the material for these sheets include a sheet made of resin and a sheet made of vulcanized rubber. As a method of joining sheets, there is a method of joining by applying an adhesive to the overlapping portion of the sheets. Bonding with an adhesive has the advantage that bonding failure is less likely to occur if the coating amount is sufficient, but it takes a relatively long time to develop bonding strength. Therefore, there is a possibility that the joint portion may be shifted or peeled off due to an accident before the sufficient strength is obtained, so that sufficient joint strength cannot be obtained.

  There is also a method such as fusion by heat. This is one that is fused by heating, but if the temperature drops, it is possible to obtain sufficient bonding strength immediately, and the time from the bonding operation to the development of bonding strength compared to bonding with an adhesive. short. However, the work of scoring the joint surface with hot air or the like requires a certain amount of familiarity. If the sprinkling time is too short, the joint is poor, and if it is too long, the strength of the sheet is reduced.

  In addition to this, there is a method in which a fusion material made of a thermoplastic material is arranged so as to straddle both sheets and bonded to a fore edge where sheets made of a thermoplastic resin such as vinyl chloride resin or polyethylene are overlapped.

JP-A-7-266426 JP 2001-40640 A

  In the method of disposing the fusing material in the small edge where the sheets are overlapped and joining the two, since the fusing material is joined by heat fusion, the bonding strength is immediately developed when the temperature of the fusing material is lowered. Further, there is no work of turning over the overlapped sheets with hot air or the like, and the work of supplying the fusion material from the top of the sheets, so that it can be said that the possibility of poor bonding is low.

  Therefore, in the present invention, when the vulcanized rubber sheet is joined, the vulcanization capable of joining the sheets by disposing a fusion material in the edge of the overlapping portion of the sheets in the same manner as the sheet made of the thermoplastic resin. It aims at providing the joining method of a rubber sheet.

  In order to achieve the above object, in claim 1 of the present invention, in the method for joining vulcanized rubber sheets, a fusion material made of a thermoplastic material is melted in a state where the ends of the sheets are overlapped with each other. It is characterized in that the vulcanized rubber sheets are joined together by placing the melted fusion material so as to straddle both sheets at the edge of the overlapped portion of the vulcanized rubber sheets while extruding.

  According to a second aspect of the present invention, the method for joining vulcanized rubber sheets according to the first aspect, wherein the thermoplastic material constituting the fusing material is not selected from ethylene ethyl acrylate, ethylene vinyl acetate, and thermoplastic olefin.

  In Claim 3, it is set as the bonding | joining method of the vulcanized rubber sheet in any one of Claim 1 or 2 formed by mix | blending an ultraviolet absorber with a fusion material.

  According to claim 1 of the present invention, there is provided a method for joining vulcanized rubber sheets, in which a fusion material melt-extruded by an extruder is disposed in a small edge where the sheets are overlapped, and the sheets are joined by the fusion material. First, it is joining by thermal fusion, and it expresses joining strength immediately after joining work, and it becomes work to place the melt-extruded fusion material in a small mouth, so that joint failure A joining method that hardly causes problems can be performed on the vulcanized rubber sheet.

  In claim 2, ethylene ethyl acrylate, ethylene vinyl acetate, and a thermoplastic olefin are cited as the thermoplastic material used for the fusing material, and can be fused with sufficient strength to the vulcanized rubber sheet. Therefore, the bonding strength between the sheets can be sufficient.

  In claim 3, an ultraviolet absorber is blended in the fusion material, and it is excellent in weather resistance even when exposed to the outdoors, and it can reduce problems such as generation of cracks over a long period of time. it can.

  FIG. 1 is a cross-sectional view of the vulcanized rubber sheets joined together, FIG. 2 is a schematic view showing the vulcanized rubber sheets superimposed in an attempt to carry out the joining method of the present invention, and FIG. It is the schematic of the place which has arrange | positioned the dressing material. The vulcanized rubber sheet 1 of the present invention is applied to waterproofing and water shielding applications such as a waterproof sheet used on the roof of a building, a water shielding sheet laid on the bottom of a waste disposal site, a reservoir, and the like. is there.

  Examples of rubbers include chloroprene rubber (CR), butyl rubber (IIR), styrene butadiene rubber (SBR), ethylene propylene diene monomer (EPDM) and the like, or a blend thereof. Although there is no limitation, the use of ethylene propylene diene monomer (EPDM) or a blend of ethylene propylene diene monomer (EPDM) and butyl rubber (IIR) is a weather resistance that is always used under outdoor exposure conditions. It is a preferable material in terms of excellent properties.

  The vulcanized rubber sheet 1 is laid on a bottom surface 2 and a slope 3 such as a waste disposal site or a reservoir as shown in FIG. A wide sheet obtained by joining a plurality of sheets is brought to the site, and installed on the bottom surface 2 and the slope 3 to join adjacent sheets so that the entire surface is covered with the sheet.

  Although it is brought to the site after making it wide to some extent in the factory, there are still many parts to be joined at the site, and the joining method of the present invention is carried out in such a scene.

  In the joining method of the vulcanized rubber sheet according to the present invention, when the adjacent vulcanized rubber sheet 1a and vulcanized rubber sheet 1b are joined together, first, one vulcanized rubber sheet 1a and the other vulcanized rubber sheet 1b are overlapped. Thus, the small edge 4 which forms the edge of the vulcanized rubber sheet 1b placed on a predetermined position and superimposed on the upper side is formed. Next, the fusion material 5 obtained by extruding the thermoplastic material into a rod shape by the heating extruder 6 is arranged so as to be in close contact with the vulcanized rubber sheets 1 a and 1 b along the small opening 4. When the fusing material 5 is closely disposed over the entire area of the small mouth 4 formed by overlapping the upper and lower vulcanized rubber sheets 1a and 1b, and the fusing material 5 is cooled and solidified, the vulcanized rubber sheets 1a and 1b are joined together. Is completed.

  The above-mentioned joining is joining by thermal fusion, and if the temperature of the fusion material 5 is lowered, the fusion is completed, and a strong joining strength can be immediately expressed. Also, it is not a matter of heat-sealing the overlapping surfaces of the sheets, and it is relatively easy to arrange the fusion material from the top of the sheet, so there is very little possibility of poor bonding. I can say that. Although the water shielding sheet used in a waste disposal site has been described as an example, the application is not limited to this, and the sheet can be used for joining a waterproof sheet laid on a rooftop of a building or the like.

  As the material of the fusion material 5 used in the present invention, ethylene ethyl acrylate (EEA), ethylene vinyl acetate (EVA), olefin-based thermoplastic elastomer (TPO), polyethylene (PE), polypropylene (PP), and these Materials such as blends can be mentioned. Among these, it is most preferable to use ethylene ethyl acrylate (EEA) from the viewpoints of excellent fusion strength with the vulcanized rubber sheet, easy extrusion with an extruder and excellent workability.

  Further, these fusion materials 5 are usually used in places exposed to the outdoors such as waste disposal sites and rooftops, and ultraviolet absorbers are used to improve the weather resistance of the fusion material 5. It is preferable to mix and use. Examples of the ultraviolet absorber include carbon black and titanium oxide. The ultraviolet absorber is blended in an amount of 4 to 20 parts by mass with respect to 100 parts by mass of the resin as the main component of the fusion material.

  The heating extruder 6 for the fusion material 5 includes a hopper 7 of raw material, a screw (not shown), and a heater (not shown). As shown in FIG. 3, a thermoplastic resin, carbon black or the like supplied from the hopper 7 is provided. The raw material is heated to a molten state and extruded as a rod-shaped fusion material 5 while being kneaded with a screw. Such an extruder is moved in the direction of the arrow in the drawing along the joining portions of the vulcanized rubber sheets 1a and 1b, and the fusion material 5 is sequentially placed in close contact with the small opening 4 from the end.

  It can be applied when joining a waterproof sheet made of a vulcanized rubber sheet or a water shielding sheet on site.

It is sectional drawing of the place which joined the vulcanized rubber sheet. It is a schematic diagram which shows the place which accumulated the vulcanized rubber sheet. It is the schematic of the place which has arrange | positioned the fusion | bonding material in the fore which piled up the vulcanized rubber sheet. It is sectional drawing of the waste disposal site of an example which lays a vulcanized rubber sheet.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1a Vulcanized rubber sheet 1b Vulcanized rubber sheet 2 Bottom surface 3 Slope 4 Small mouth 5 Fusion material 6 Heating extruder 7 Hopper

Claims (3)

  In the joining method of the vulcanized rubber sheet, the melted material made of a thermoplastic material is melted and extruded while the end portions of the sheets are overlapped with each other, and the vulcanized rubber sheet overlaps both sheets. As described above, the method for joining vulcanized rubber sheets is characterized by arranging the melted fusion material and joining the vulcanized rubber sheets together.   The method for joining vulcanized rubber sheets according to claim 1, wherein the thermoplastic material constituting the fusing material is at least one selected from ethylene ethyl acrylate, ethylene vinyl acetate, and thermoplastic olefin.   The method for joining vulcanized rubber sheets according to claim 1, wherein an ultraviolet absorber is blended in the fusion material.

Images