JPH073962A - Sheet material bonding method - Google Patents

Abstract

PURPOSE:To secure firm bonding even on the extremely uneven ground surface by bonding waterproof sheets, formed of specific material, by specific resin or thermoplastic elastomer. CONSTITUTION:At least one kind selected as bonding material 2 out of ultra- high molecular weight polyethylene resin, high density polyethylene resin, PP resin, ethylene-propylene copolymer resin, EPDM/PP group, EPDM/IIR/PP group and IIR/PP group elastomer and styrene group thermoplastic elastomer is interposed in the fused state between the same or different kind of sheet material 1 formed of the material selected out of the vulcanized rubber of ethylene-propylene-diene group ternary copolymerized rubber EPDM, the vulcanized rubber of butyl group rubber (isobutylene-isoprene copolymerized rubber IIR), thermoplastic EPDM/PP group elastomer formed of EPDM and polypropylene PP resin, thermoplastic EPDM/IIR/PP group elastomer formed of EPDM and IIR and PP resin, and thermoplastic IIR/PP group elastomer formed of IIR and PP resin. The bonding material is then cooled.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for joining a plurality of sheet materials, and particularly to a waterproof construction on a rooftop of a building such as a building or a dumping or storage place of industrial waste while joining ends of waterproof sheets. For joining sheet materials for

[0002]

2. Description of the Related Art A sheet material is laid for waterproofing a rooftop of a building such as a building, or sewage discharged from industrial waste dumped or stored on the ground flows out into the ground to pollute the environment. It is laid for the reasons such as to prevent In order to lay a sheet material on the rooftop of a building, especially in the dumping or storage area of vast industrial waste, a plurality of sheet materials cut into a certain length are arranged and their ends are joined to each other. I am trying to do it.

Conventionally, as a sheet material to be laid on the roof of the above-mentioned building or for dumping or storing industrial waste, waterproof property, weather resistance (durability) made of ethylene-propylene-diene terpolymer rubber or the like is used. A vulcanized rubber sheet with excellent properties is used. However, since the vulcanized rubber sheet cannot be firmly bonded with the existing bonding material, there is a problem in bonding durability. In particular, when laying a sheet material on the surface of the ground with severe irregularities such as the dumping or storage place of industrial waste, a large tensile load or deformation is applied to the joint part, so that the joint durability is further improved. The problem was big. Moreover, the laying of waterproof sheets, etc. on the rooftop of the above-mentioned building or the dumping of industrial waste or the storage location,
Generally, the equipment is not sufficiently installed, and the work is performed on site. Therefore, when the above sheet materials are strongly joined, there is a problem that work efficiency is significantly deteriorated.

Further, since the vulcanized rubber sheet does not have thermoplasticity (moldability), the sheet material is cut in accordance with the step in a place having a large step such as a rooftop of a building. Since they are joined together, there is a problem that workability is deteriorated and it becomes difficult to obtain a durable waterproof effect.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method for joining sheet materials, which enables the same or different sheet materials made of vulcanized rubber and thermoplastic elastomer to be firmly joined to each other. Another object of the present invention is to provide a joining method of sheet materials that enables joining with good work efficiency and workability.

[0006]

Means for Solving the Problems The present invention for achieving the above-mentioned object is to provide a vulcanized rubber comprising an ethylene-propylene-diene terpolymer rubber (hereinafter abbreviated as EPDM) and a butyl rubber. Vulcanized rubber composed of (isobutylene-isoprene copolymer rubber) (hereinafter abbreviated as IIR), EPDM
Thermoplastic elastomer (hereinafter abbreviated as EPDM / PP-based elastomer) made of polypropylene and polypropylene resin (hereinafter abbreviated as PP resin), thermoplastic elastomer (hereinafter abbreviated as EPDM / IIR / PP-based elastomer) composed of EPDM, IIR and PP resin Abbreviated) and thermoplastic elastomer composed of IIR and PP resin (hereinafter,
IIR / PP-based elastomer), a super-high molecular weight polyethylene resin or a high-density polyethylene resin (hereinafter abbreviated as HDPE resin) as a bonding material between the same or different sheet materials molded from a material selected from the group , PP resin, ethylene-
Propylene copolymer resin (hereinafter abbreviated as EP resin), EPDM
/ PP elastomer, EPDM / IIR / PP elastomer, IIR
This can be achieved by inserting at least one selected from the group of the / PP elastomer and the styrene thermoplastic elastomer in a molten state, and then cooling the bonding material.

As described above, at least one selected from the above-mentioned specific resin and thermoplastic elastomer is inserted as a bonding material between the above-mentioned specific same or different sheet materials in a molten state, and then the bonding material is cooled. By doing so, it becomes possible to perform strong and highly durable joining with good work efficiency. Needless to say, the bonded state cannot be obtained unless the molten state is satisfied, that is, the melting point or higher is not satisfied. Moreover, since different types of vulcanized rubber sheets and thermoplastic elastomer sheets, especially thermoplastic elastomer sheets having moldability, can be joined together, the workability thereof can be significantly improved. The above-mentioned object of the present invention is to provide a vulcanized rubber sheet molded from EPDM or IIR with an EPDM / PP elastomer or EPD.
This can be achieved by directly laminating sheets formed from the M / IIR / PP elastomer or IIR / PP elastomer, heating and melting, and then cooling.

By directly joining the specific thermoplastic elastomer sheet to the specific vulcanized rubber sheet in this manner, the insertion and lamination of the joining material can be omitted, so that the working efficiency can be further improved. become. In the present invention, as a sheet material, a conventionally known vulcanized rubber sheet such as EPDM or IIR having excellent moisture permeation resistance (waterproofness), weather resistance, flexibility and the like, strength characteristics, moisture permeation resistance and flexibility are used. A sheet made of a thermoplastic EPDM / PP-based elastomer, EPDM / IIR / PP-based elastomer, or IIR / PP-based elastomer having excellent moldability and the like is used.

The vulcanized rubber sheet used in the present invention includes known EPDM and IIR or chlorinated isobutylene-isoprene copolymer rubber (hereinafter abbreviated as Cl-IIR) or brominated isobutylene-isoprene copolymer rubber (hereinafter, An unvulcanized rubber composition containing (abbreviated as Br-IIR) is molded and vulcanized into a sheet, and is not particularly limited. In addition, the above-mentioned Cl-IIR, Br
-IIR-containing materials can be used.

In the present invention, the thermoplastic elastomer is a physical property defined by ASTM D-638 and ASTM D-1566 Standard 28, 756, which is measured by a test method specified in ASTM D-638 and ASTM D-1566. That is, a tension set of 160% or less, a compression set of 120 ° C × 72hr of 50% or less, a Young's modulus (standard of flexibility) of 2500 kgf / cm ² or less, and rubber elasticity of 120 ° C or less. Say.

Such EPDM / PP elastomer, EPD
For M / IIR / PP elastomers and IIR / PP elastomers, use a mixer such as Banbury or Brabender or a kneading extruder such as a twin-screw kneading extruder, and melt the PP resin in these devices. EPDM or EPDM and IIR or IIR are added to and finely kneaded and dispersed, and then vulcanization of EPDM or EPDM and IIR or IIR is completed while masticating at a temperature at which vulcanization is accelerated. Forming, i.e., dynamic vulcanization (d
Synthetic cure or dynamic vulcanization).

In the thermoplastic elastomer obtained by this dynamic vulcanization, the rubber component forms a discontinuous phase and exhibits the same behavior as the vulcanized rubber, and the resin component forms a continuous phase.
Due to its thermoplasticity, it enables the same molding process as thermoplastic resins. By this dynamic vulcanization, PP resin usually forms a continuous phase and EPDM or IIR forms a discontinuous phase, but a so-called salami structure in which PP resin is further dispersed in the rubber component of the discontinuous phase is formed. You may do it.

The vulcanization system of the rubber component in the above dynamic vulcanization is not particularly limited, but EPDM is preferably phenol-based, sulfur-based or organic peroxide. Also IIR
Is preferably a phenol type, a sulfur type or a quinone dioxime type. The mixing ratio of the resin component and the rubber component constituting the thermoplastic elastomer is the total amount of the resin component and the rubber component.
The rubber component should be in the range of 20 to 80 parts by weight, preferably 30 to 75 parts by weight, based on 100 parts by weight.

The rubber component of the thermoplastic elastomer is preferably dispersed in the resin component of the continuous phase with an average particle size of 50 μm or less, preferably 20 μm or less, more preferably 5 μm or less. In the present invention, a specific resin and a specific thermoplastic elastomer are selectively used as a joining material for the sheet material composed of the specific vulcanized rubber and the thermoplastic elastomer. These bonding materials may be formed into a sheet shape and independently inserted between the sheet materials, or may be bonded to the sheet material in advance and melted to contribute to the bonding. May be. Alternatively, the melted material may be applied to the end portion of the sheet material from the beginning.

Ultrahigh molecular weight polyethylene has a molecular weight of 1
It is preferably, 000,000 or more. The higher the molecular weight, the better, but it is difficult to manufacture extremely high molecular weight, and the limit is 5 million. When this ultrahigh molecular weight polyethylene is used after being formed into a sheet shape in advance, it is difficult to extrude into a sheet.
(° C.) Or higher, heat and pressure sintering is performed to form a plate, a block or a column, and the formed product is cut into a thin wall to form a sheet. Further, the powder of the ultrahigh molecular weight polyethylene may be heated and pressed to directly form a sheet. The thickness of the sheet is preferably in the range of 50 μm to 1.5 mm. When it is 50 μm or more, the bonding strength can be enhanced, while when it is 1.5 mm or less, it is easily melted by heating and the workability can be improved.

As the HDPE resin, a commercially available one can be used and is not particularly limited. Preferably
0.935 g / cm ³ or more, more preferably 0.940 to 0.965 g / cm ³
It is preferable to use one having a density of. PP resin and EP
As the resin, known resins can be used and are not particularly limited.

As the EPDM / PP type elastomer, EPDM / IIR / PP type elastomer and IIR / PP type elastomer, the same ones as the above thermoplastic elastomer sheet can be used. As the styrene-based thermoplastic elastomer,
An ethylene-butylene copolymer such as an ethylene-butylene block, a polybutadiene block, a polyisoprene block, a hydrogenated polyolefin block having a hard segment consisting of a polystyrene block corresponding to a crosslinking point at both ends and exhibiting rubber elasticity in the middle. And an elastomer segment having the elastomer segment described above, which has both thermoplasticity and rubber-like elasticity during molding. Of these, a styrene-based thermoplastic elastomer in which the middle elastomer segment is an ethylene-butylene block is preferable.

This styrenic thermoplastic elastomer is 1
It can be heated and melted at a temperature of 00 ° C. or higher, and the melt can be reinforced by applying it on the above-mentioned joining material, particularly on the portion joined with the ultra-high molecular weight polyethylene, to further improve the joining strength. In the present invention, in order to firmly bond the above sheet materials, it is necessary to heat and melt the above bonding material. The heating temperature is a temperature higher than the melting point thereof, and may be appropriately selected in consideration of the pressure conditions and the like in accordance with the material properties within a range that does not cause deterioration, decomposition, or extreme deformation of the sheet and / or the bonding material. Good. The melting point +5 to 50 ° C is preferable for practical use. The heating means is not particularly limited, and any heating means such as electric heating, hot air heating, hot plate heating, and high frequency induction heating can be used.

Further, in the present invention, the joining portion where the above-mentioned joining material is heated and melted is pressed by a press or the like, preferably by pressing at a pressure of 2 kgf / cm ² or more, more preferably 5 kgf / cm ² or more, The bonding strength can be improved. If it is less than ² kgf / cm ² , the joining becomes unstable, which may hinder the practical use of the product. In addition, the surface of the sheet material may be subjected to slip prevention or may be subjected to embossing for the purpose of improving the appearance. The temperature may be taken into consideration depending on the state of the material surface, and the joining may be performed at an appropriate pressure. The upper limit of the pressure during this pressing is not particularly limited.
When joining in a factory, it is preferable to join at a pressure of about 10 to 50 kgf / cm ² . Moreover, especially considering the convenience of on-site construction, welding at ² to 10 kgf / cm ² is possible.

In the present invention, as a mode of joining the sheet materials, the ends of the sheet materials 1 and 1 are butted as shown in FIG. 1, or the sheet materials 1 and 1 are joined as shown in FIG.
Alternatively, the end portions of 1 may be overlapped with each other, and the sheet-shaped bonding material 2 may be overlapped with these butted portions or the overlapped portions, and the sheets may be heated and melted and cooled to be joined. Further, when the end portions of the sheet materials 1 and 1 are abutted with each other or overlapped to be joined as described above, the joining material 2 in a molten state is directly applied and joined as shown in FIG. 5 or FIG. Good. In this case, the workability is remarkably improved because sufficiently strong joining can be performed with a press having a low pressure of about 2 kgf / cm ² .

When the sheet-shaped joining material 2 is used, as shown in FIGS. 3 (A) and 4 (A), the sheet material 1 is preliminarily joined to both ends or one end thereof, and they are stacked. Together, the bonding material 2 is melted by heating, pressed at a pressure of at least 2 kgf / cm ² , preferably 5 to 20 kgf / cm ² , and then cooled to obtain the structure shown in FIGS. 3 (B) and 4 (B), respectively. You may make it join like this.

Another bonding method of the present invention is EPDM or
The thermoplastic elastomer sheet made of EPDM / PP elastomer or EPDM / IIR / PP elastomer or IIR / PP elastomer is directly laminated on the vulcanized rubber sheet made of IIR, and the thermoplastic elastomer sheet is heated and melted. Cool while pressed at low pressure. Preferably at least 2 kgf / cm ² , more preferably 5 kgf / c
It is recommended to press at a pressure of m ² or less. Since this method does not require the insertion of a bonding material, it has excellent workability and remarkably improves workability. INDUSTRIAL APPLICABILITY The present invention can be applied not only to a construction surface such as a rooftop having a relatively small unevenness, but also to construction of a vast surface such as a mountainous portion with remarkable unevenness. Especially when constructing the latter ground surface with remarkable unevenness, the joining method of melt-coating the joining material as shown in FIGS. 5 and 6 is simple and excellent in workability and workability, and a large joining strength can be obtained. It is advantageous.

[0023]

【Example】

Example 1 (Joining between similar sheet materials) Six types of rubber compositions 1 to 5 having the composition shown in Table 1
Vulcanized rubber sheets 1 to 5 and 11 were produced from Nos. 11 and 11, and elastomer sheets 6 to 9 and EPDM manufactured by Mitsui Petrochemical Co., Ltd. were prepared from four types of thermoplastic elastomers having the compositions shown in Table 2.
Elastomer sheets 10 were manufactured from thermoplastic elastomers (partially cross-linked "Millastomer 9070N") composed of PP and PP.

These vulcanized rubber sheets 1 to 5 and 11 and the thermoplastic elastomer sheets 6 to 10 are respectively formed into a width of 300 mm ×
We prepared several pieces cut into a size of length 300 mm × thickness 1.5 mm. The melting points of the thermoplastic elastomer sheets measured by a differential scanning calorimeter (DSC) were 140 ° C for the elastomer sheets 6 to 9 and 135 ° C for the elastomer sheet 10.

[0025] In the above table, the values are in weight parts EPDM is Mitsui Petrochemical's "Mitsui EPT4070" IIR is Exxon Chemical's "Exon Butyl 268" Cl-IIR is Exxon Chemical's "Chlorobutyl 1066" NBR is Nippon Zeon's "Nipol 1042 "HAF is Showa Cabot's" Show Black N330T "SAF is Asahi Carbon's" Asahi # 50 "Paraffin type process oil is Showa Shell's" Machine oil 2 "
2 "Antiaging agent is N-Phenyl-N'-isopropyl-p-phenylenediamine" Ozonone 3C "manufactured by Seiko Chemical Co., Ltd. TAIC is triallyl isocyanurate Percadox 14/40 manufactured by Nippon Kasei Co., Ltd. 3-Bis- (t-butylperoxyisopropyl) -benzene 40% content Brominated alkylphenol resin is "Tacchiroll 250-I" TT manufactured by Taoka Chemical Industry Co., Ltd. is tetramethylthiuram disulfide "Sunceller TT" manufactured by Sanshin Chemical Industry Co., Ltd.
-PO "M is 2-mercaptobenzothiazole manufactured by Sanshin Chemical Industry Co., Ltd.
"Sun cellar M" TS is tetramethylthiuram monosulfide manufactured by Sanshin Chemical Industry Co., Ltd. "Sun cellar T"
SG "DM is benzothiazyl disulfide" SANCERA DM "manufactured by Sanshin Chemical Industry Co., Ltd. CZ is N-cyclohexyl-2-benzothiazylsulfenamide" SANCERA CM-G "manufactured by Sanshin Chemical Industry Co., Ltd.

The vulcanized rubber sheets 1, 3, 5 and 11 are sulfur vulcanized products, the vulcanized rubber sheet 2 is a peroxide vulcanized product, and the vulcanized rubber sheet 4 is a resin vulcanized product.

On the other hand, five kinds of resins a to d, i shown in Table 3 are used.
And four types of thermoplastic elastomers e to h were molded into a sheet or pellet, respectively, to produce bonding materials a to i having a size of width 40 mm x length 300 mm x thickness 0.2 mm. In Table 3, the styrene thermoplastic elastomer is SEBS "Kraton G" EPDM / PP elastomer manufactured by Shell Chemical Co., Ltd. is the EPDM / PP = 60/40 (weight ratio) dynamically vulcanized product EPDM / IIR / PP elastomer is EPDM / IIR / PP = 20/40/40
It is a dynamic vulcanization product of (weight ratio). The melting point is a value measured by a differential scanning calorimeter (DSC).

The vulcanized rubber sheets 1 to 5 and 11 and the thermoplastic elastomer sheets 6 to 10 are provided with the bonding materials a to i shown in Table 3 as shown in FIG. The materials are overlapped with each other, and the temperature is higher than the melting point (bonding materials a, b, c, d, e, f, g, h are 180 ° C., bonding material i
At 250 ° C.), and heated and melted under a pressure of 20 kgf / cm ² using a hot plate press, held for 5 minutes, and then cooled and joined.

The peeling test of the joined portion of the sheet material thus joined was measured by the following method, and the results are shown in Table 4. Peeling test method : As a joining sample, peeling was performed at room temperature by using the above-mentioned locations where heat fusion was caused and the locations where fusion was not performed by inserting a release paper or the like as the starting points, and heat fusion was performed. The presence or absence of damage to the joined portion was examined.

The case where the sheet material was broken was judged to be good (shown by ◯), and the case where interfacial peeling occurred was judged to be bad (shown by x).

As shown in Table 4, vulcanized rubber sheets 1 to 5 and thermoplastic sheets 6 to 6 joined by using the joining materials a to h.
In No. 10, no damage was observed in the joint portion, and the sheet portion was broken. On the other hand, the bonding material i (nylon
6) was used for bonding and the vulcanized rubber sheet 11 was bonded with the bonding materials a to h, interfacial peeling occurred at the bonded portion, resulting in poor bonding (x).

Further, the vulcanized rubber sheets 1 to 1 of the same kind as described above are used.
5, 11 and the thermoplastic elastomer sheets 6 to 10,
Directly superimposing without joining materials a to i
It heated at 180 degreeC for 5 minutes, and hot-pressed at 20 kgf / cm < ² >, and joined. As a result of performing a peeling test in the same manner as described above, the thermoplastic elastomer sheets 6 to 10 had good bondability (○), but the vulcanized rubber sheets 1 to 5 and 11 had poor bondability (x). It was

Example 2 (Joining between different sheet materials) As shown in Table 5, the vulcanized rubber sheets 1 to 5 and 11 and the thermoplastic elastomer sheets 6 to 10 of Example 1 are combined with different sheet materials. , And the joining materials a to i were used for joining in the same manner as in Example 1. Regarding these joining sheets, Example 1
Table 5 shows the results of the peeling test performed in the same manner as in.

[0034] In Table 5, − indicates that the test was not performed. As shown in Table 5, the vulcanized rubber sheets 1 to 5 and the thermoplastic sheets 6 to 10 joined by using the joining materials a to h all had good joining properties (◯), but the joining material i (Nylon 6) is used for joining and the vulcanized rubber sheet 11 is used for joining materials ah
In all cases, the joints were defective (x).

Example 3 (Direct Bonding) In Example 2, hot air of 400 ° C. was applied to the overlapping portions at both ends of the sheet material without interposing the bonding materials a to i into a molten state, and 5 kgf / cm. A pressure of ² was applied to bond directly. As a result of performing a peeling test in the same manner as in Example 2, the thermoplastic elastomer sheets 6 to 10 are good against the vulcanized rubber sheets 1 to 5 other than the thermoplastic elastomer sheets 6 to 10 and the vulcanized rubber sheet 11 (○. ). On the other hand, the bondability between the vulcanized rubber sheets 1 to 5 is poor (x).
Met. Further, the vulcanized rubber sheet 11 had poor bondability (x) to any of the thermoplastic elastomer sheets 6 to 10 and the vulcanized rubber sheets 1 to 5.

Example 4 (Other Joining Method 1) In Example 2, the combination of different sheet materials and the insertion of the joining materials a to i are the same, and the joining method is as shown in FIG.
As shown in, both ends of the sheet material are overlapped with a width of 40 mm, and an extruder (Munsch small extruder) is placed on the overlapped part.
Each of the joining materials a to i processed into a string shape having a diameter of about 3 mmφ was melt-extruded by using, and joined by applying a pressure of ² kgf / cm ² .

As a result of conducting the above-mentioned peeling test on each of the joining sheets, the vulcanized rubber sheets 1 to 5 and the thermoplastic sheets 6 to 6 joined by using the joining materials a to h as in Example 2.
In all 10, the bondability was good (◯). But,
In both cases of joining using the joining material i (nylon 6) and joining the vulcanized rubber sheet 11 with the joining materials a to h, there was poor joining (x).

Example 5 (Other Joining Method 2) In Example 2, the combination of different sheet materials and the insertion of the joining materials a to i are the same, and the joining method is as shown in FIG.
As shown in FIG. 4, sheet-like joining materials a to i having a width of 40 mm are preliminarily fused to the end portions of one sheet material under pressure with a hot plate press, and then the other joining materials a to i are joined. The end portions of the sheet material of (1) were superposed on each other, and hot air of 400 ° C. was applied to make them into a molten state, and then a pressure of 5 kgf / cm ² was applied to perform cooling bonding.

As a result of performing the above-mentioned peeling test on each of the joining sheets, the vulcanized rubber sheets 1 to 5 and the thermoplastic sheets 6 to 6 joined by using the joining materials a to h as in Example 2.
In all 10, the bondability was good (◯). On the other hand, when the joining material i (nylon 6) was used for joining and the vulcanized rubber sheet 11 was joined with the joining materials a to h, the joining was defective (x).

Example 6 (Influence of Pressure) In Example 5, the pressure conditions were 5 kgf / cm ² and 1.5 kgf / c.
Bonding was performed under the same conditions except that m ² was changed, and the above-described peeling test was performed on each bonding sheet. As a result, when the pressure was set to 5 kgf / cm ² , the vulcanized rubber sheets 1 to 5 and the thermoplastic sheets 6 to 10 joined by using the joining materials a to h were the same as in Example 2. In all cases, the bondability was good (◯). On the other hand, when the joining material i (nylon 6) is used for joining and the vulcanized rubber sheet 11
In the case of joining with the joining materials a to h, the joining was poor (x) in all cases.

On the other hand, when the pressure was set to 1.5 kgf / cm ² , some parts with good adhesion and some parts with poor adhesion were mixed, and the joining became unstable, so that a sufficient joining state could not be obtained. It was That is, it can be seen from Examples 1 and 2 that for a combination of two specific sheet materials, a good bonding state can be obtained due to the presence of the bonding material as long as a certain bonding condition is satisfied. In addition, a more limited specific combination from Example 3, specifically, EPDM-based vulcanized rubber sheet and IIR-based vulcanized rubber sheet, EPDM / PP-based, EPDM / IIR / PP.
It can be seen that a good joining state can be obtained with each of the IIR / PP type thermoplastic elastomer sheets and the IIR / PP type thermoplastic elastomer sheets without a joining material. Further, from Examples 4 and 5, as long as the above-mentioned certain bonding conditions are satisfied, a good bonding state was obtained for the specific combination independently of the bonding method, and from Example 6, practically,
It is understood that the pressure is preferably ² kgf / cm ² or more.

[0042]

EFFECTS OF THE INVENTION According to the present invention, an ultrahigh molecular weight polyethylene resin, a HDPE resin, a PP resin as a bonding material is thus used as a bonding material between sheet materials composed of a specific same or different kind of vulcanized rubber and a thermoplastic elastomer. At least one selected from EP resin, EPDM / PP-based elastomer, EPDM / IIR / PP-based elastomer, IIR / PP-based elastomer, and styrene-based thermoplastic elastomer is put in a molten state and inserted, and then cooled. It enables strong and durable joining without deterioration over time. Moreover, not only the vulcanized rubber sheet and the thermoplastic elastomer sheet of the same kind but also sheet materials made of different kinds of vulcanized rubber and thermoplastic elastomer can be joined to each other, so that the workability thereof can be improved.

Further, for a specific vulcanized rubber sheet material and thermoplastic elastomer sheet material, it is possible to mold the thermoplastic elastomer into a sheet material and directly bond the sheet material, so that workability is further improved. It will be possible to improve.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a joined portion of sheet materials showing one embodiment of the method of the present invention.

FIG. 2 is a cross-sectional view of a joined portion of sheet materials showing another embodiment of the method of the present invention.

FIG. 3A is a cross-sectional view showing a state before joining of sheet materials showing another embodiment of the method of the present invention. (B)
FIG. 7A is a cross-sectional view showing a state after (A) is joined.

FIG. 4A is a cross-sectional view showing a state before joining of sheet materials showing still another embodiment of the method of the present invention.
(B) is sectional drawing which shows the state after (A) joining.

FIG. 5 is a cross-sectional view of a joint portion of sheet materials showing another embodiment of the method of the present invention.

FIG. 6 is a sectional view of a joint portion of a sheet material showing another embodiment of the method of the present invention.

[Explanation of symbols]

 1 sheet material 2 bonding material

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Claims (7)

[Claims] 1. An ethylene-propylene-diene terpolymer vulcanized rubber, a butyl vulcanized rubber, a thermoplastic elastomer comprising an ethylene-propylene-diene terpolymer rubber and a polypropylene resin, and ethylene-propylene. A same or different sheet material molded from a material selected from the group consisting of a thermoplastic elastomer composed of a diene terpolymer rubber, a butyl rubber and a polypropylene resin and a thermoplastic elastomer composed of a butyl rubber and a polypropylene resin. In between, ultra-high molecular weight polyethylene resin as a bonding material, high-density polyethylene resin, polypropylene resin, ethylene-propylene copolymer resin, ethylene-propylene-diene-based terpolymer rubber and thermoplastic elastomer consisting of polypropylene resin, Ethylene-propylene-diene ternary At least one selected from the group consisting of a thermoplastic rubber consisting of a polymer rubber, a butyl rubber and a polypropylene resin, a thermoplastic elastomer consisting of a butyl rubber and a polypropylene resin, and a styrene thermoplastic elastomer is inserted in a molten state, Then, a method for joining sheet materials, in which the joining material is cooled. 2. The end portions of the sheet material are butted against each other, and a sheet-shaped joining material is overlapped between the butted portions,
The method for joining sheet materials according to claim 1, wherein the joining material is melted by heating and then cooled. 3. The sheet material according to claim 1, wherein the end portions of the sheet material are overlapped with each other, a sheet-like joining material is inserted between the overlapping portions, and the joining material is heated and melted and then cooled. How to join. 4. The sheet material according to claim 1, wherein the end portions of the sheet material are butted or overlapped with each other, and a bonding material in a molten state is previously inserted and applied between the butted portions or the overlaid parts and then cooled. How to join. 5. The sheet material joining method according to claim 1, wherein the molten joining material is pressed together with the sheet material. 6. The method for joining sheet materials according to claim 5, wherein the pressure of the press is set to 2 kgf / cm ² or more. 7. A vulcanized rubber sheet molded from ethylene-propylene-diene terpolymer rubber or butyl rubber, and a thermoplastic elastomer comprising ethylene-propylene-diene terpolymer rubber and polypropylene resin. Alternatively, a thermoplastic elastomer composed of an ethylene-propylene-diene terpolymer rubber, a butyl rubber and a polypropylene resin or a sheet molded from a thermoplastic elastomer composed of a butyl rubber and a polypropylene resin is directly laminated, and the thermoplastic elastomer is laminated. A method for joining sheet materials in which sheets are heated and melted and then cooled.