JPH0374912B2 - - Google Patents

Description

[Detailed description of the invention]

INDUSTRIAL APPLICATION FIELD The present invention relates to a lining material for lining water supply pipes for the purpose of repair or reinforcement. In recent years, for the purpose of repairing or reinforcing aging pipes such as water supply pipes, gas pipes, power lines, communication lines, etc., a method of lining the inner surface of the pipe has been adopted. The inner surface of a cylindrical flexible lining material is coated with adhesive in advance, and the lining material is inserted into the pipe while turning the inner and outer surfaces inside out using fluid pressure. A method of lining has been carried out in which the inner surface of the lining material is bonded to the inner surface of the conduit using fluid pressure, and the inner surface of the lining material is adhered to the inner surface of the conduit via the adhesive. According to this construction method, there is no need to dig up the entire length of the pipeline for construction, and it is possible to construct long pipelines in a short time, and it is also possible to construct even pipelines with many bends. This method has attracted particular attention in recent years as an extremely excellent method. By the way, the lining material used in this method is not only flexible and airtight, but also takes into consideration the influence of creep and earthquakes that occur after lining the pipe in the length direction and direction of the pipe. Since appropriate strength is required in the radial direction, a cylindrical fabric with a synthetic resin coating formed on the outer surface is used. In particular, in the case of lining materials applied to water supply pipes, the synthetic resin that makes up the coating layer is required to be safe in terms of water quality. It is necessary to apply the standards of Japan Water Works Association (JWWA). This JWWA standard requires that the materials used meet the water quality test specified in the ``Tar Epoxy Resin Paint Coating Method for Water Supply'' (K-115). In this test, turbidity, color, potassium permanganate consumption,
Details such as chlorine consumption are specified,
Resins such as polyolefin-based synthetic resins and fluorine-based synthetic resins are specified as resin materials that form the film layer of the lining material that conforms to this standard. Among these, fluorocarbon resins are extremely expensive and have poor extrusion properties, so they are not suitable as resin materials for the coating of pipe lining materials. Therefore,
The resin materials used for this purpose are practically limited to polyolefin-based synthetic resins. By the way, as a polyolefin synthetic resin,
There are high-density polyethylene resins, medium-density polyethylene resins, low-density polyethylene resins, polypropylene resins, polybutene resins, etc., but those other than low-density polyethylene resins are inferior in flexibility, and low-density polyethylene resins are inferior in durability. However, these materials were not necessarily suitable as materials for the coating layer of the lining material for pipes. BACKGROUND OF THE INVENTION The present inventors have previously developed a film using linear low-density polyethylene resin as a lining material for water pipes, and a film made of polyethylene resin, polypropylene resin, and pure styrene containing no oil. A product using a blend of ethylene butylene and styrene resin was devised (Utility Application No. 176565-1982 and Utility Application No. 44499-1981). Furthermore, we have developed a product in which the outer layer is a polyolefin synthetic resin with an environmental stress cracking resistance of 1000 hours or more, and the inner layer is a resin made by grafting ethylenically unsaturated carboxylic acid onto an ethylene-vinyl acetate copolymer (specially (Gan Sho 60-29989). The linear low-density polyethylene resin used in the lining material of Utility Application No. 176565/1988 is a polyolefin-based synthetic resin whose main component is ethylene, which is obtained by copolymerizing ethylene and α-olefin. Its density is about 0.910 to 0.940 g/ ^cm3 , and it belongs to low-density polyethylene resin, and its molecular structure has a structure similar to linear high-density polyethylene resin with almost no branches. . The characteristics of this linear low density polyethylene resin are:
It has a tensile strength of 330 kg/cm ² , which is comparable to high-density polyethylene resin, and has excellent durability with environmental stress cracking resistance of over 1000 hours, but it has the softness of low-density polyethylene resin. are doing. Although polyethylene generally has good chemical resistance, it can crack when exposed to certain liquids or vapors when under stress or with residual processing distortion. This may occur. This phenomenon is called environmental stress cracking.
The environmental stress cracking resistance described in this specification is measured by the test method specified in the ASTM-D-1693 standard, and is determined by applying a certain strain to polyethylene resin. It represents the time it takes for cracks to occur when placed in a similar environment, and is a measure of the durability of polyethylene resin. This property is particularly required for the lining material of a pipe through which water flows, especially when the lining material has a smaller diameter than the inner diameter of the pipe to which it is applied and is crimped and lined by expanding its diameter. It is extremely important. In addition, the styrene-ethylene-butylene-styrene resin used in the lining material of the above-mentioned Utility Application No. 59-44499 is generally called a styrene elastomer, and is a thermoplastic elastomer that can replace vulcanized rubber. It is an excellent resin. This styrene-ethylenebutylene-styrene resin is characterized by hydrogenating the remaining double bonds in the central rubber block of a styrene-isoprene-ethylene block copolymer, which significantly improves the lack of stability against heat and weather resistance. It is something that This styrene-ethylene-butylene-styrene resin is stable against heat and extremely flexible, and has desirable performance as a material for a coating for lining in the above-mentioned lining method. However, this styrene-ethylenebutylene-styrene resin is rarely used alone;
Generally commercially available "styrene-ethylene-butylene-styrene resin" has poor environmental stress cracking resistance and poor fluidity. , improved stress cracking resistance, and improved water flow and flexibility by incorporating oil. However, as mentioned above, “styrene-ethylene-butylene-
Water quality tests have shown that styrene resin is undesirable because the stabilizer and oil in polypropylene ooze out to the surface, resulting in increased chlorine consumption. In this specification, this commercially available "styrene-ethylenebutylene-styrene resin"
is referred to as a styrene-ethylenebutylene-styrene resin composition. For these reasons, the present inventors first developed pure styrene containing no polypropylene or oil.
Ethylene-butylene-styrene resin and polyethylene resin were blended to combine only the excellent properties of both and compensate for their shortcomings. However, as a general property of polyolefin-based synthetic resins, adhesive strength As a result of further research, the present inventors have developed a film that has superior environmental stress cracking resistance and flexibility as well as adhesive properties as described above. (Patent Application No. 60-29989). Problems to be Solved by the Invention The present inventors have provided various new technologies as described above, but even these are not sufficient as materials constituting the film of the lining material for water pipes. In other words, although the linear low-density polyethylene resin used in the lining material of Utility Application No. 176565 is more flexible than high-density polyethylene resin or medium-density polyethylene resin, it has a Shore D hardness. It is around 50 degrees and is not a sufficiently flexible synthetic resin. This material is not flexible enough to be used as a film for the lining material used to line pipes in the construction method described above, and as the diameter of the lining material becomes smaller, it becomes difficult to turn it over. requires considerably higher fluid pressures. In addition, the blend of styrene-ethylene-butylene-styrene resin and linear low-density polyethylene resin used in the lining material of Utility Application No. 59-44499 has a Shore D hardness at a blend ratio of 50:50. 40, which is more flexible than the aforementioned linear low-density polyethylene resin alone, but it is still not sufficient, and the styrene-ethylene-butylene-styrene resin is 70%
Those with a lower rating are inferior in trauma resistance and environmental stress cracking resistance. Furthermore, the ethylene-vinyl acetate copolymer used in the lining material of Japanese Patent Application No. 60-29989 has a vinyl acetate content of about 7 to 30%, and is flexible and has good adhesive properties. For those with a vinyl content of 25%, carboxyl groups are added to the ethylene-vinyl acetate copolymer by grafting an ethylenically unsaturated carboxylic acid, such as acrylic acid, methacrylic acid, maleic anhydride, or a derivative thereof. By doing this, the adhesion with the cylindrical fabric was improved, and a Shore D hardness of about 30 was obtained, and a resin made by grafting ethylenically unsaturated carboxylic acid to this ethylene-vinyl acetate copolymer was used for the inner layer. Polyolefin-based synthetic resins with environmental stress cracking resistance of 1000 hours or more, such as those with an outer layer of linear low-density polyethylene resin, are
It has greater flexibility than that disclosed in No. 44499. However, ethylene-vinyl acetate copolymers have the disadvantage of a low melting point. Therefore, when used in the above-mentioned lining method, there are specific problems. In other words, in the above-mentioned lining construction method, a two-component reaction-curing thermosetting adhesive is generally used as the adhesive, but when using this type of adhesive, it is important to ensure that it does not begin to harden during construction. First, an adhesive with a sufficiently long pot life must be used, taking into account the time required to complete lining by reversing and inserting the lining material after preparing the adhesive.
On the other hand, as the pot life of the adhesive increases, the curing time also increases in proportion to this, and it takes a long time to bond the lining material and the pipe. Therefore, in the lining construction method, if the adhesive can be heated, it will accelerate curing and shorten the curing time, which is convenient, but if it is difficult to heat the adhesive, this convenience will be reduced. It will be lost.
Therefore, the present inventors devised a structure in which an intermediate layer of a styrene-ethylenebutylene-styrene resin composition was formed between the outer layer and the inner layer of the above-mentioned cylindrical lining material to form three layers. This is intended to cover the thermal stability of the ethylene-vinyl acetate copolymer while maintaining the benefits of the ethylene-vinyl acetate copolymer in the inner layer. However, when heating the adhesive, if the steam directly contacts the outer layer, the ethylene-vinyl acetate copolymer in the inner layer will melt, which will not only reduce the adhesion with the cylindrical fabric described above but also cause the ethylene-vinyl acetate copolymer to melt. - The vinyl acetate copolymer soaks into the weave or stitches of the cylindrical fabric due to the fluid pressure required for crimping, causing distortion in the outer resin layer, which is still unsatisfactory. . The present invention was made in view of this situation. Means for Solving the Problems The present invention solves the above-mentioned problems by means as detailed below. That is,
The first lining material provided by the present invention is one in which a two-layered resin material film is formed on the outer surface of a cylindrical fabric, and the outer layer of the film has environmental stress cracking resistance for 1000 hours. It is formed from the above polyolefin-based synthetic resin, and the inner layer contains 30 to 70% of a resin obtained by grafting ethylenically unsaturated carboxylic acid to an α-olefin polymer and 70 to 30% of a styrene-ethylenebutylene-styrene resin composition. It is characterized by being formed from a mixed resin.
A second lining material provided by the present invention also includes:
A three-layer resin film is formed on the outer surface of a cylindrical fabric, and the outer layer of the film is
It is formed from a polyolefin-based synthetic resin that has an environmental stress cracking resistance of 1000 hours or more, the middle layer is formed from a styrene-ethylenebutylene-styrene resin composition, and the inner layer is made from a polymer of α-olefin with ethylenically unsaturated carbon. It is characterized by being formed of a resin that is a mixture of 30 to 70% of an acid-grafted resin and 70 to 30% of a styrene-ethylenebutylene-styrene resin composition. As the cylindrical fabric used for the lining material according to the present invention, the materials used in the prior art as described above are used, and the lining material is also manufactured by the extrusion molding method applied to this type of product. This is done by The thickness of the resin material film laminated on the outer surface of the cylindrical fabric is appropriately determined depending on the diameter of the pipe and the flexibility and mechanical strength of the resin material. The numerical range is not particularly specified, but will be easily understood by those skilled in the art from the numerical values shown in the examples below. A more detailed explanation will be given below with reference to the accompanying drawings. The first lining material according to the present invention is a lining material used in the above-mentioned lining construction method, and as schematically shown in FIG. Environmental stress cracking resistance
The outer layer 2 is a polyolefin-based synthetic resin that has been used for more than 1000 hours, and a resin that is made by grafting ethylenically unsaturated carboxylic acid onto an α-olefin polymer is used for 30 to 70 hours.
% and a styrene-ethylene-butylene-styrene resin composition of 30 to 70%. As schematically shown in FIG. 3, the second lining material according to the present invention has an intermediate layer of a styrene-ethylenebutylene-styrene resin composition between the outer layer 2 and the inner layer 3 of the first lining material. It is characterized in that it is laminated in three layers. In the lining material of the present invention, the polyolefin synthetic resin used for the outer layer 2 of the coating 4 is required to have an environmental stress cracking resistance of 1000 hours or more as described above. Examples include high-density polyethylene resin with a density of 0.941 g/cm3 or ^more , linear low-density polyethylene resin with a density of 0.910 to 0.940 g/ ^cm3 , crosslinked polyethylene resin with a density of 0.910 to 0.940 g/cm3, 1-polybutene resin, etc. It will be done. Further, the α-olefin polymer in the resin used for the inner layer 3 has three or more carbon atoms, such as polypropylene, 1-polybutene, etc.; For example, acrylic acid, methacrylic acid,
It is a product obtained by grafting maleic anhydride or a derivative thereof, and has improved adhesion by adding a carboxyl group to α-olefin. By blending the α-olefin polymer with a styrene-ethylenebutylene-styrene resin composition, it is softened and its adhesive strength is further improved. At the same time, the styrene-ethylenebutylene-styrene resin composition has improved environmental stress cracking resistance and durability. For the above blend, the blend ratio is:
A modified styrene-ethylenebutylene-styrene resin composition containing 30 to 70% resin of α-olefin polymer grafted with ethylenically unsaturated carboxylic acid.
70-30%. When the modified styrene-ethylenebutylene-styrene resin composition is 70% or more, a flexible product can be obtained, but the adhesive strength is lowered and becomes poor. On the other hand, if it is less than 30%, the flexibility will be poor and the adhesive strength will be poor. In the lining material according to the present invention, the blend ratio is
By setting the ratio to be 50:50, a Shore A hardness of about 70 can be obtained, and a product with excellent adhesive strength can be obtained. Further, the styrene-ethylenebutylene-styrene resin composition used for the intermediate layer 5 in the second lining material is preferably a flexible one having a Shore A hardness of 30 to 80. When manufacturing lining materials, in conventional lining materials, a synthetic resin material is directly extruded onto the outer surface of a cylindrical fabric to form a film layer, and the synthetic resin material is placed between the fibers of the cylindrical fabric. An integral film layer is formed on the cylindrical fabric by rubbing and adhering.A synthetic resin tube with two or three layers laminated on the outside of the cylindrical fabric 1 is extruded and molded to form a cylindrical fabric. The synthetic resin tube is preferably adhered to the outer surface of the cylindrical fabric 1 by reducing the pressure inside to form the coating 4. According to the present invention, the outer layer 2, which comes into direct contact with the fluid flowing inside the pipe after lining, is made of a polyolefin synthetic resin that has excellent environmental stress cracking resistance. The safety of the water quality is ensured without affecting the water quality, and a product with excellent hydrolysis resistance, heat resistance, and trauma resistance can be obtained. Therefore, this outer layer 2 can effectively prevent water contamination and also prevent damage to the lining material when the lining material is turned over and inserted into the conduit. In addition, since the inner layer 3 of the coating 4 uses a mixture of a resin obtained by grafting ethylenically unsaturated carboxylic acid onto an α-olefin polymer and a styrene-ethylenebutylene-styrene resin composition, it is heat-resistant. In this case, it is no longer necessary to provide an inner layer of a resin obtained by grafting an ethylenically unsaturated carboxylic acid to an ethylene-vinyl acetate copolymer, and to provide an intermediate layer of a styrene-ethylene butylene-styrene resin composition. Furthermore, in the second lining material, the intermediate layer 5 of the coating 4 is made of extremely flexible styrene.
Since the ethylene-butylene-styrene resin composition is used, even when a material with low hardness and particularly excellent adhesive strength is used as the inner layer 3, the flexibility of the entire film 4 is not impaired, and it is heat resistant. It can be finished with improved properties. As an example of the present invention, specific examples of lining materials used for water pipes with a diameter of 200 mmφ will be shown below together with comparative examples. In each of the Examples and Comparative Examples, 638 strands of 4 1100 denier polyester filament yarns twisted together were used as the warp yarns for the tubular fabric 1, and 638 yarns were used as the weft yarns. and four 20 count polyester spun yarns with a twist count of 2.0~
The threads mixed and twisted at a rate of 2.5 turns/inch were inserted at a rate of 62 threads per 10 cm to weave it into a cylindrical shape. In order to ensure the strength of the lining material and the adhesion to the coating 4, it is preferable to use spun yarn as part of the threads constituting the tubular fabric 1 as in this embodiment. In each Example and Comparative Example, the specific structure of the coating 4 formed on the outer surface of the tubular fabric 1 is shown. Example 1 Outer layer: High-density polyethylene resin (Mitsui Petrochemical Co., Ltd. Hi-Zex 500H, density 0.950 g/
^cm3 , Shore D hardness 60 degrees, melting point 132℃, tensile strength 370Kg/ ^cm2 , elongation at break 900%, environmental stress cracking resistance: 1000 hours or more) Inner layer: polypropylene grafted with ethylenically unsaturated carboxylic acid The resin and the styrene-ethylenebutylene-styrene resin composition were mixed in a ratio of 50:50.
Blended resin (Modic F-300V manufactured by Mitsubishi Yuka Co., Ltd., polypropylene molecular weight, tens of thousands to 200,000, carboxylic acid addition rate, 1 to 15%, density 0.89
g/cm ³ , Shore A hardness 70 degrees, melting point 130 degrees Celsius, tensile strength 65 Kg/cm ² , elongation at break 500%) Total thickness of film: 0.7 mm Thickness ratio of inner and outer layers: outer layer/inner layer = 1/1 Example 2 Outer layer: Linear low-density polyethylene resin (Mitsui Petrochemical Co., Ltd. Ultzex 2021L, density 0.918
g/cm ³ , Shore D hardness 50 degrees, melting point 120 degrees Celsius, tensile strength 330 Kg/cm ² , elongation at break 740%, environmental stress cracking resistance: 1000 hours or more) Inner layer: polypropylene with ethylenically unsaturated carboxylic acid The grafted resin and the styrene-ethylenebutylene-styrene resin composition were mixed at a ratio of 50:50.
(same as Example 1 above) Total thickness of film: 0.7 mm Thickness ratio of inner and outer layers: outer layer/inner layer = 1/1 Example 3 Outer layer: Cross-linked low-density polyethylene resin (link manufactured by Mitsubishi Yuka Co., Ltd.) Ron XLE700A, density 0.928g/
cm ³ , Shore D hardness 50 degrees, environmental stress cracking resistance:
(1000 hours or more) Inner layer: A resin made of polypropylene grafted with ethylenically unsaturated carboxylic acid and a styrene-ethylenebutylene-styrene resin composition in a 50:50 ratio.
Resin blended with (same as Example 1 above) Total thickness of film: 0.7 mm Thickness ratio of inner and outer layers: outer layer/inner layer = 1/1 Example 4 Outer layer: 1-polybutene resin (Uitztron manufactured by Adeka Argus Chemical Co., Ltd.) 1210A, density 0.905
g/cm ³ , Shore D hardness 52 degrees, melting point 115℃, tensile strength 288 Kg/cm ² , elongation at break 350%, environmental stress cracking resistance over 5000 hours) Inner layer: polypropylene grafted with ethylenically unsaturated carboxylic acid The resulting resin and the styrene-ethylenebutylene-styrene resin composition were mixed in a ratio of 50:50.
Resin blended with (same as Example 1 above) Total thickness of film: 0.7 mm Thickness ratio of inner and outer layers: outer layer/inner layer = 1/1 Example 5 Outer layer: High density polyethylene resin (same as Example 1 above) Intermediate layer : Styrene-ethylene butylene-styrene resin composition (Labaron manufactured by Mitsubishi Yuka Co., Ltd.)
ME6302, density 0.90g/cm ³ , Shore A hardness 68 degrees,
Melting point 130℃, tensile strength 161Kg/cm ² , elongation at break
850%) Inner layer: 50:50 resin of polypropylene grafted with ethylenically unsaturated carboxylic acid and styrene-ethylenebutylene-styrene resin composition.
(same as Example 1 above) Total thickness of film: 0.7mm Thickness ratio of each layer: Outer layer/middle layer/inner layer = 1/
1/1 Example 6 Outer layer: Linear low density polyethylene resin (example 2 above)
) Intermediate layer: styrene-ethylenebutylene-styrene resin composition (same as in Example 5 above) Inner layer: a resin obtained by grafting ethylenically unsaturated carboxylic acid onto polypropylene, and a styrene-ethylenebutylene-styrene resin composition. , 50:50
Resin blended with (same as Example 1 above) Total thickness of film: 0.7 mm Thickness ratio of each layer: Outer layer: Intermediate layer/Inner layer = 1/
1/1 Comparative Example 1 Outer layer: High density polyethylene resin (Example 1 mentioned above)
) Intermediate layer: Styrene-ethylenebutylene-styrene resin composition (same as in Example 5 above) Inner layer: Resin obtained by grafting ethylenically unsaturated carboxylic acid onto ethylene-vinyl acetate copolymer (Mitsubishi Yuka Co., Ltd.) Manufactured by Model E300S, vinyl acetate content 25%, density 0.950g/cm ³ , Shore D hardness
34 degrees, melting point 88 degrees Celsius, tensile strength 110 Kg/cm ² , elongation at break 850%) Total thickness of film: 0.7 mm Thickness ratio of inner and outer layers: outer layer / middle layer / inner layer =
1/1/1 Comparative Example 2 Outer layer: linear low density polyethylene resin (same as Example 2 above) Intermediate layer: styrene-ethylenebutylene-styrene resin composition (same as Example 5 above) Inner layer: ethylene-vinyl acetate Resin in which ethylenically unsaturated carboxylic acid is grafted onto a copolymer (same as Comparative Example 1 above) Total thickness of film: 0.7 mm Thickness ratio of each layer: outer layer/intermediate layer/inner layer = 1/
1/1 Comparative Example 3 Single-layer comparative example using high-density polyethylene resin (same as that described in Example 1 above) 4 Single-layer comparative example using linear low-density polyethylene resin (same as Comparative Example 2 above) 5 Linear low-density polyethylene resin (same as that described in Example 1 above) A 50:50 blend of density polyethylene resin and styrene-ethylenebutylene-styrene resin (Lavalon 9200C manufactured by Mitsubishi Yuka Co., Ltd., Shore D hardness 40 degrees, melting point 130 degrees Celsius, tensile strength 270)
Kg/cm ² , elongation at break 750%, environmental stress cracking resistance for 1000 hours or more) Single layer performance test (a) Characteristics of each resin Hardness: Shore D hardness or Shore D hardness according to ASTM-D-2240 A hardness (degree) was measured. Density: Measured according to JIS-K-7112.
(g/cm ³ ) Tensile strength and elongation at break: ASTM-D-
Measured according to 6381. (Kg/cm ² ,%) Environmental stress cracking resistance of the resin constituting the outer layer:
Measured according to ASTM-D-1693 (time) Softening temperature (Vikat softening point): ASTM-D-
Measured according to 1525. (°C) (B) Characteristics of laminate Under the same conditions as when manufacturing the lining material, only the film layer of each example was extruded to form a laminate, and the tensile strength and elongation at break of the laminate were determined. The temperature was measured according to ASTM-D-6381. (Kg/cm ² , %) (c) Characteristics of lining materials Lining materials having film layers formed thereon according to each of the Examples and Comparative Examples were manufactured, and their characteristics as lining materials were determined. Examples 1 to 6, Comparative Example 1, and Comparative Example 2
For Comparative Examples 3 to 5, synthetic resin was rubbed onto the outer surface of the cylindrical fabric by reducing the pressure in the cylindrical fabric immediately after extruding the laminated tube and adhering it to the outer surface of the cylindrical fabric. A film layer was formed and bonded to obtain each lining material. Heat-resistant operating temperature: Live steam was introduced into the lining material, and the temperature (°C) that the film layer could withstand was measured. Potassium permanganate consumption: JWWA-K
Measured in accordance with the -115 standard. (mg/) Residual chlorine consumption: Measured in accordance with the JWWA-K-115 standard. (ppm) Adhesion peel strength: The peel force (Kg/25 mm width) between the cylindrical fabric and the film layer was measured by 180 degree peeling. Trauma resistance: A lining material is pasted on the surface of an iron pipe with a diameter of 400 to 500 mm, a cloth belt with a load of 500 kg is hung on the lining material over a range of 5 to 10 cm, and the belt is 10m/min
The degree of damage to the film layer of the lining material was examined by sliding it at a speed of 50 m. Self-propelled reversal pressure: The lining material was turned over over 5 m using fluid pressure, and the minimum fluid pressure (Kg/cm ² ) required for turning over was measured. The above measurement results are shown in Tables 1 and 2, and FIG. 1 of the accompanying drawings shows changes in adhesion peel strength as the measurement temperature increases in Example 2 and Comparative Example 2.

【table】

【table】

[Table] *Resin water quality test of ethylene-vinyl acetate copolymer grafted with ethylenically unsaturated carboxylic acid JWWA test specimens of the film layer of the lining material in the examples and pipes lined with the lining material
-K-115, turbidity, color, potassium permanganate consumption, residual chlorine consumption, amount of phenols, amines, cyanide, odor and taste were tested. The test results are shown in Table 3.

【table】

[Table] Effects of the invention The lining material according to the present invention is flexible and has a cylindrical fabric 1
Since the adhesion between the material and the coating 4 is strong, when used in the above-mentioned lining construction method, the lining material is easily turned over, and the coating 4 will not be damaged or peeled off from the tubular fabric 1. When the adhesive used in the lining method is heated to accelerate curing, the inner layer 3 melts and the cylindrical fabric 1
This prevents the resin from penetrating into the weave or stitches of the resin and causing distortion in the outer layer, so as shown in FIG. It does not significantly reduce the adhesive strength of the product. Furthermore, the layers of the coating 4 do not peel off, making it possible to provide a pipe line with excellent durability over a long period of time.

[Brief explanation of drawings]

FIG. 1 shows the change in adhesion peel strength with increasing temperature of each product according to Example 2 of the present invention and Comparative Example 2, and FIGS. 2 and 3 show, respectively,
FIG. 1 is a perspective view schematically showing a lining material for a conduit according to the present invention. 1...Tubular fabric, 2...Outer layer, 3...Inner layer, 4
...Film layer, 5...Intermediate layer.

Claims (1)

[Scope of Claims] 1. A cylindrical flexible lining material is inserted from one end of a water supply pipe to the other end while being turned over by fluid pressure, and the inner surface of the cylindrical lining material is inserted into the pipe. A cylindrical lining material used in a method of lining a pipeline by adhering it to the inner surface of the pipe, and the lining material is made of a cylindrical fabric made of woven or knitted synthetic fiber yarn. , a two-layer resin film is formed, the outer layer of which is made of a polyolefin synthetic resin with environmental stress cracking resistance of 1000 hours or more, and the inner layer is made of α
-30-70% resin of olefin polymer grafted with ethylenically unsaturated carboxylic acid and styrene-
Ethylene butylene-styrene resin composition 70-30%
A lining material for water supply pipes, characterized in that it is formed from a resin mixed with. 2. The lining material according to claim 1, wherein the polyolefin synthetic resin is a high-density polyethylene resin. 3. The polyolefin synthetic resin is a linear low density polyethylene resin,
The lining material according to claim 1. 4. The lining material according to claim 1, wherein the polyolefin synthetic resin is a crosslinked polyethylene resin. 5. The lining material according to claim 1, wherein the polyolefin synthetic resin is a 1-polybutene resin. 6. Inserting a cylindrical flexible lining material from one end of the water supply pipe to the other end while turning it over using fluid pressure, and bonding the inner surface of the cylindrical lining material to the inner surface of the pipe. A cylindrical lining material used in a construction method for lining pipes, the lining material being a resin material laminated in three layers on the outer surface of a cylindrical fabric made of woven or knitted synthetic fiber yarns. The outer layer of the film is made of a polyolefin synthetic resin with environmental stress cracking resistance of 1000 hours or more, and the middle layer is made of a styrene-ethylene-butylene-styrene resin composition. , the inner layer is formed of a resin that is a mixture of 30 to 70% of a resin obtained by grafting ethylenically unsaturated carboxylic acid to an α-olefin polymer and 70 to 30% of a styrene-ethylenebutylene-styrene resin composition. A lining material for water supply pipes characterized by: 7. The lining material according to claim 6, wherein the polyolefin synthetic resin is a high-density polyethylene resin. 8. The polyolefin synthetic resin is a linear low density polyethylene resin,
The lining material according to claim 6. 9. The lining material according to claim 6, wherein the polyolefin synthetic resin is a crosslinked polyethylene resin. 10 The above polyolefin synthetic resin is 1-
The lining material according to claim 6, characterized in that it is a polybutene resin.