JP2000313065A - Lining pipe and lining method for existing pipe using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lining pipe capable of lining an existing pipe by passing the lining pipe reduced in diameter through the existing pipe to heat the same and a lining method of the existing pipe capable of being performed without adapting a cut-and-cover method. SOLUTION: A lining pipe is formed by using a shape memory rubber compsn. (C) consisting of an ethylene/α-olefin/non-conjugated polyene copolymer rubber (A) which consists of ethylene, a 3-20C α-olefin and non-conjugated polyene and a polyolefinic resin (B). An existing pipe is lined by a method wherein a lining pipe having an outer diameter slightly larger than the inner diameter of the existing pipe is molded by using the shape memory rubber compsn. and heated to temp. higher than the m.p. or softening point of the polyolefinic resin (B) to be deformed into a shape capable of being inserted in the existing pipe to be cooled and this deformed lining pipe is inserted in the existing pipe and a fluid of which the temp. is higher than the m.p. or softening point of the polyolefinic resin (B) is passed through the lining pipe to heat the lining pipe to restore the original shape thereof to closely bond the lining pipe to the inner surface of the existing pipe.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lining pipe inserted into a pipe for corrosion prevention of a steel pipe or the like and inserted into the pipe for repairing an existing pipe, and a lining method of the existing pipe using the same.

[0002]

2. Description of the Related Art In general, as a countermeasure against corrosion of a gas or water supply steel pipe, a pipe inner surface is lined with a resin or the like. Especially in the case of existing buried pipes, it is required that lining is performed without excavation without excavation.The method of repairing non-open cuts is a normal lining method, a method of inserting a resin pipe and expanding it by heating and pressing. Are used.

[0003] The lining method is a method in which a lining agent such as a resin is melted or dissolved in a solvent or the like to flow along the inner wall of the pipe to perform lining. Low long-term reliability, such as cracks caused by strong ground motion. In addition, since it takes time to clean the inside of the pipe before lining, it is not suitable as a construction method for emergency treatment in an emergency. In addition, the construction period is long and the construction cost is expensive.

The method of expanding a resin tube by heating and pressurizing it after insertion is a method that has been put to practical use in Europe. However, the thermoplastic resin tube used is hard, and it is possible to repair existing straight tubes and bend tubes. However, since the inside of the elbow cannot be bent and passed through by 90 degrees, it is not suitable for repairing a pipe having many bends. In addition, since not only heating but also a pressurizing device is required at the construction site, there is a problem that a considerably advanced construction technique is required and the cost of incidental equipment is high.

Accordingly, the applicant of the present invention used a resin tube formed of polyethylene having a degree of crosslinking of 65% or more and having a relatively good shape memory property in the main body of the resin tube, and was heated to a first temperature near the melting point to be uniform. After the diameter is reduced, the material is cooled, heated to a second temperature for softening while maintaining that state, inserted into the existing pipe in the softened state, and then heated to the first temperature to return to the size before the diameter reduction ( Japanese Unexamined Patent Publication No. 6-114935) has been proposed, but a pressurization is necessary for a sufficient diameter return, and a lining tube having good shape memory properties has been desired.

[0006]

An object of the present invention is to pass a resin pipe having an outer diameter smaller than the inner diameter of an existing pipe through an existing pipe, and then pass a heated liquid or gas through the resin pipe and pressurize the resin pipe. It is an object of the present invention to provide a lining pipe that can be expanded and lined by simply heating, and a method for lining an existing pipe that can be performed without cutting using the lining pipe.

[0007]

The lining tube according to the present invention comprises an ethylene / α-olefin / non-conjugated polyene copolymer rubber comprising ethylene, an α-olefin having 3 to 20 carbon atoms, and a non-conjugated polyene. It is characterized by being formed using a shape memory rubber composition (C) comprising a composition containing A) and a polyolefin-based resin (B).

[0008] In the lining tube of the present invention, the shape memory rubber composition (C) is based on 100 parts by weight of the ethylene / α-olefin / non-conjugated polyene copolymer rubber (A).
The polyolefin resin (B) preferably contains 10 to 50 parts by weight.

In the present invention, the ethylene / α-olefin / non-conjugated polyene copolymer rubber (A) is preferably an ethylene / propylene / non-conjugated diene copolymer rubber.

In the present invention, the polyolefin resin (B) has a Vicat softening point of 50 ° C. or more,
It is preferably 60 ° C. or lower. The polyolefin resin (B) preferred in the present invention is at least one resin selected from polypropylene, polybutene, ethylene-butene-terpolymer (EBT), polystyrene, ABS resin, ethylene-methacrylic acid copolymer, and ionomer resin. is there.

In a preferred embodiment of the lining tube of the present invention, a tubular layer made of another thermoplastic resin (D) is provided on the inner layer side and / or outer layer side of the tubular layer made of the shape memory rubber composition (C). It is laminated.

In a preferred embodiment of the lining tube of the present invention, a tubular layer made of another thermoplastic resin (D) is laminated between two tubular layers made of the shape memory rubber composition (C). I have.

In a preferred embodiment of the present invention, the lining tube is a corrugated tube having a bellows shape.

The method for lining an existing pipe according to the present invention comprises:
Shape memory comprising a composition comprising ethylene, an α-olefin having 3 to 20 carbon atoms, an ethylene / α-olefin / non-conjugated polyene copolymer rubber (A) comprising a non-conjugated polyene and a polyolefin-based resin (B) After forming a lining pipe having an outer diameter slightly larger than the inner diameter of an existing pipe to be lined using the conductive rubber composition (C), the melting point or softening point of the polyolefin-based resin (B) is obtained by molding the lining pipe. It is heated to the above temperature to deform it into a shape that can be inserted into the existing pipe, and then cooled to a temperature lower than the melting point or softening point of the polyolefin resin (B) to maintain its shape. After that, the polyolefin resin (B) is placed in the lining tube.
Is heated by passing through a fluid having a temperature equal to or higher than the melting point or softening point of the lining to restore the lining tube to its original shape and adhere to the inner surface of the existing tube.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION The lining tube of the present invention comprises an ethylene / α-olefin / non-conjugated polyene copolymer rubber (A) comprising ethylene, an α-olefin having 3 to 20 carbon atoms, and a non-conjugated polyene. A shape memory rubber composition (C) comprising a composition containing a polyolefin resin (B) is used.

The ethylene / α-olefin / non-conjugated polyene copolymer rubber (A) used in the present invention is obtained by random copolymerizing ethylene, an α-olefin having 3 to 20 carbon atoms, and a non-conjugated polyene. The resulting ethylene / α-olefin / non-conjugated polyene copolymer rubber.

The α-olefin is an α-olefin having 3 to 20 carbon atoms.
-Olefins, among them propylene, 1-butene,
Α-olefins having 3 to 10 carbon atoms such as 4-methyl-1-pentene, 1-hexene and 1-octene are preferred, and propylene and 1-butene are particularly preferred. That is, in the present invention, an ethylene / propylene / non-conjugated polyene copolymer rubber or an ethylene / 1-butene / non-conjugated polyene copolymer rubber is preferably used.

The ethylene / α-olefin / non-conjugated polyene copolymer rubber (A) used in the present invention has a molar ratio of ethylene / α-olefin (ethylene / α-olefin) of 60/40 to 85/15. , Preferably 65/35
Those in the range of ~ 80/20 are desirable.

As the non-conjugated polyene, a cyclic or chain non-conjugated polyene is used. Examples of the cyclic non-conjugated polyene include 5-ethylidene-2-norbornene, dicyclopentadiene, 5-vinyl-2-norbornene, norbornadiene, and methyltetrahydroindene. Examples of the chain non-conjugated polyene include 1,4-hexadiene, 7-methyl-1,
6-octadiene, 8-methyl-4-ethylidene-1,
Examples thereof include 7-nonadiene and 4-ethylidene-1,7-undecadiene. These non-conjugated polyenes are used alone or in combination of two or more, and the copolymerization amount thereof is
It is desirable that the iodine value is 1 to 40, preferably 2 to 35, more preferably 3 to 30.

The intrinsic viscosity [η] of the ethylene / α-olefin / non-conjugated polyene copolymer rubber (A) measured at 135 ° C. in decalin (decahydronaphthalene) used in the present invention is 0.8 to 4 dl / g. , Preferably 1 to 3.5 d
1 / g, more preferably in the range of 1.1 to 3 dl / g.

The ethylene / α-olefin / non-conjugated polyene copolymer rubber (A) may be a modified product obtained by graft copolymerization of an unsaturated carboxylic acid or a derivative thereof, for example, an acid anhydride.

As the ethylene / α-olefin / non-conjugated polyene copolymer rubber (A), an ethylene / propylene / non-conjugated diene copolymer rubber is most preferred. Ethylene / α-olefin / non-conjugated polyene copolymer rubber (A)
Can be used alone or in combination of two or more.

Ethylene α-having the above properties
The olefin / non-conjugated polyene copolymer rubber (A) can be prepared by a known method using a transition metal catalyst.

The polyolefin resin (B) used in the present invention is blended as a shape-imparting resin.
In the case of a resin containing an α-olefin as a main component, it may be a crystalline resin or an amorphous resin, but a crystalline resin is preferred. The crystalline resin used as the polyolefin-based resin (B) in the present invention has 2 carbon atoms.
And α-12 homopolymers or copolymers.

As the crystalline polyolefin resin (B), polypropylene, polybutene, ethylene / butene terpolymer (EBT), ethylene / methacrylic acid copolymer, and ionomer resin are preferable. Specifically, propylene homopolymer, propylene and one or more carbon atoms having 2 to 2
1-butene homopolymer, copolymer of 1-butene and one or more α-olefins having 2 to 12 carbon atoms; ethylene-butene-diene copolymer ( Examples of the diene include dicyclopentadiene, ethylidene norbornene, and 1,4-hexadiene.

The α-olefin having 2 to 12 carbon atoms includes, for example, ethylene, propylene, 1-butene, 1-pentene, 1-hexene, 4-methyl-1-pentene, 1-octene and 1-decene And so on.

This polymerization mode may be any of random polymerization and block polymerization. In the case of a random copolymer, an α-olefin copolymer containing the smaller α-olefin structural unit in an amount of usually 40 mol% or less, preferably 30 mol% or less is desirable.

As the amorphous resin used as the polyolefin resin (B) in the present invention, for example, polystyrene and ABS resin are preferable. Specifically, a homopolymer of styrene, a copolymer of styrene with acrylonitrile, methyl methacrylate, α-methylstyrene, etc .; 20 to 35 mol% of acrylonitrile constituent units, 20 to 30 mol% of butadiene constituent units, Styrene structural unit 40 ~
An ABS resin containing 60 mol% is exemplified.

The polyolefin resin (B) used in the present invention preferably has a Vicat softening point (temperature) of 50 ° C. or more and 160 ° C. or less as measured by ASTM D1525. When the Vicat softening point of the polyolefin-based resin (B) is in the above range, a lining tube having excellent shape stability can be obtained. The polyolefin resin (B) can be used alone or in combination of two or more.

In the shape memory rubber composition (C) used for molding the lining tube in the present invention, the particles of the polyolefin resin (B) are contained in the ethylene / α-olefin / non-conjugated polyene copolymer rubber (A). Micro-dispersed in
The average dispersed particle size is usually 0.1 to 200 μm, preferably 0.1 to 100 μm, more preferably 0.1 to 5 μm.
It is desirable to be in the range of 0 μm. The average dispersed particle diameter can be determined from a photograph obtained by staining a section of the elastomer with a heavy metal and photographing the section with an electron microscope such as a transmission electron microscope.

The dispersed particles of the polyolefin resin (B) have an aspect ratio (major axis / minor axis) of 5 or less, preferably 1 to 5.
It is desirably 3. When the aspect ratio is 5 or less, the microdispersion of the polyolefin-based resin (B) particles is good.

The content ratio of each component of the shape memory rubber composition (C) used in the present invention is based on 100 parts by weight of the ethylene / α-olefin / non-conjugated polyene copolymer rubber (A) and the polyolefin resin. (B) 10 to 50 parts by weight, preferably 10 to 40 parts by weight.
In the case of such a content ratio, a lining tube having an excellent balance between heat recovery and rubber elasticity can be obtained.

The shape-memory resin can maintain its deformed shape by performing shape deformation at a high temperature and cooling in the deformed state, and by heating it again to the temperature at which it was deformed again, It has the property of recovering its shape.

In the case of the shape memory rubber composition (C) of the present invention, the mechanism of shape memory is considered as follows. That is, the polyolefin resin (B) contained in the shape memory rubber composition (C) is micro-dispersed in an ethylene / α-olefin / non-conjugated polyene copolymer rubber (A) having rubber elasticity. When this resin is heated and deformed to a temperature higher than the melting point or softening point of the polyolefin resin (B),
The dispersed particles of the polyolefin-based resin (B) are deformed, for example, from a spherical shape to an elliptical shape or a flat shape according to the changing shape, and then solidified when cooled.
Therefore, even if an attempt is made to return to the original shape due to the rubber elasticity of the ethylene / α-olefin / non-conjugated polyene copolymer rubber (A) component, the dispersed particles of the deformed polyolefin resin (B) prevent the shape recovery. In this state, the deformed shape is maintained. When the polyolefin resin (B) is heated again to a temperature higher than the melting point or softening point of the polyolefin resin (B), the dispersed particles of the polyolefin resin (B), which have prevented the recovery of the shape, soften and easily deform.・ Non-conjugated polyene copolymer rubber (A)
It recovers its original shape due to the rubber elasticity of the component.

The shape-memory rubber composition (C) used in the present invention may further comprise, if necessary, other than the ethylene / α-olefin / non-conjugated polyene copolymer rubber (A) and the polyolefin resin (B). Components, such as reinforcing materials, pigments, softeners, fillers, processing aids, antioxidants, and foaming agents, which are commonly used in the production of rubber, to the extent that the objects of the present invention are not impaired. You can also.

A typical example of the reinforcing material is a polyamide fiber. Specific examples of polyamide fibers include polyamide 6 (nylon 6), polyamide 66 (nylon 66), and polyamide 11 (nylon 1
1), polyamide 12 (nylon 12), polyamide 6
10 (nylon 610) as a raw material. The fibers may be short fibers or long fibers, but short fibers are preferred. The polyamide fibers can be used alone or in combination of two or more.

The compounding amount of the polyamide fiber is ethylene · α
-Olefin / non-conjugated polyene copolymer rubber (A) 10
20 parts by weight or less, preferably 3 to 20 parts by weight with respect to 0 parts by weight
It is desirable that the amount be 3 parts by weight, more preferably 3 to 10 parts by weight.

As the reinforcing material, carbon black is usually used. As carbon black, SRF, G
PF, FEF, MAF, ISAF, SAF, FT, MT
Various carbon blacks can be used without limitation. The amount of carbon black is ethylene
-Olefin / non-conjugated polyene copolymer rubber (A) 10
300 parts by weight or less based on 0 parts by weight, preferably 80 to
It is desirable to use 200 parts by weight.

As other reinforcing materials, for example, finely divided silica is appropriately used. These reinforcing materials are usually 200 parts by weight or less based on 100 parts by weight of the ethylene / α-olefin / non-conjugated polyene copolymer rubber (A).
Preferably, it is used in a proportion of 150 parts by weight or less.

As the pigment, known inorganic pigments (for example, titanium white) and organic pigments (for example, naphthol green B) can be used. These pigments are desirably used in a proportion of at most 20 parts by weight, preferably at most 10 parts by weight, based on 100 parts by weight of the ethylene / α-olefin / non-conjugated polyene copolymer rubber (A).

As the softening agent, a softening agent usually used for rubber can be used. For example, petroleum softening agents such as process oil, lubricating oil, paraffin, liquid paraffin, petroleum asphalt, petrolatum; coal tar softening agents such as coal tar and coal tar pitch; castor oil, rapeseed oil, soybean oil, coconut oil, etc. Fatty oil-based softeners; tall oil; waxes such as beeswax, carnauba wax and lanolin; fatty acids such as ricinoleic acid, palmitic acid, stearic acid, barium stearate and calcium stearate or metal salts thereof; naphthenic acid or metal soaps thereof Pine oil, rosin or derivatives thereof; synthetic polymer substances such as terpene resin, petroleum resin, coumarone indene resin, atactic polypropylene; ester plasticizers such as dioctyl phthalate, dioctyl adipate, dioctyl sebacate; diisododecyl carbonate Etc. System plasticizers; Other microcrystalline wax, sub (factice), liquid polybutadiene, modified liquid polybutadiene, liquid Thiokol, and hydrocarbon synthetic lubricating oil.

The compounding amount of the softening agent is desirably 200 parts by weight or less, preferably 50 to 150 parts by weight, based on 100 parts by weight of the ethylene / α-olefin / non-conjugated polyene copolymer rubber (A).

As the filler, for example, light calcium carbonate, heavy calcium carbonate, talc, clay and the like are used. It is desirable to use these fillers in a proportion of usually 200 parts by weight or less, preferably 150 parts by weight or less, based on 100 parts by weight of the ethylene / α-olefin / non-conjugated polyene copolymer rubber (A).

As processing aids, processing aids used in ordinary rubber processing can be used. Examples of such processing aids include higher fatty acids such as ricinoleic acid, stearic acid, palmitic acid, and lauric acid; higher fatty acid salts such as barium stearate, calcium stearate, and zinc stearate; ricinoleic acid esters, stearic acid esters; And higher fatty acid esters such as palmitic acid esters and lauric acid esters.

These processing aids are used in an amount of usually about 10 parts by weight or less, preferably about 1 to 10 parts by weight, based on 100 parts by weight of the ethylene / α-olefin / non-conjugated polyene copolymer rubber (A).
It is desirable to use 5 parts by weight.

Examples of the anti-aging agent include aromatic secondary amine-based stabilizers such as phenylbutylamine and N, N'-di-2-naphthyl-p-phenylenediamine; dibutylhydroxytoluene, tetrakis [methylene (3,5 −
Phenolic stabilizers such as di-t-butyl-4-hydroxy) hydrocinnamate] methane; bis [2-methyl-4- (3-n-alkylthiopropionyloxy)-
Thioether stabilizers such as [5-t-butylphenyl] sulfide; dithiocarbamate stabilizers such as nickel dibutyldithiocarbamate;

These antioxidants can be used alone or in combination of two or more. Such an antioxidant is generally used in an amount of 0.1 to 100 parts by weight of the ethylene / α-olefin / non-conjugated polyene copolymer rubber (A).
It is desirable to use 5 parts by weight, preferably 0.5 to 3 parts by weight.

Examples of foaming agents include inorganic foaming agents such as sodium bicarbonate, sodium carbonate, ammonium bicarbonate, ammonium nitrite, azide compounds, sodium borohydride; azodicarbonamide, azodicarbonamide, barium azodicarboxylate, N Organic foams such as N, N'-dinitropentamethylenetetramine, 4,4-oxybis (benzenesulfonylhydrazine), diphenylsulfone-3,3-disulfonylhydrazide, p-toluenesulfonylsemicarbazide, trihydrazinotriazine and biurea Agents and the like.

These foaming agents can be used alone or in combination of two or more. Such blowing agents are:
Usually, 1 to 20 parts by weight, based on 100 parts by weight of the ethylene / α-olefin / non-conjugated polyene copolymer rubber (A),
Preferably, it is used in a proportion of 2 to 15 parts by weight.

The lining tube of the present invention may be formed of a crosslinked resin. In such a case, the shape memory rubber composition (C) contains a vulcanizing agent, a vulcanization accelerator, a vulcanization aid and the like. Is heated and crosslinked by heating during or after molding.
It is preferable from the viewpoint of shape memory properties that the resin forming the lining tube is made of a crosslinked resin.

[0051] Examples of the vulcanizing agent include sulfur compounds and organic peroxides. Examples of the sulfur compound include sulfur, sulfur chloride, sulfur dichloride, morpholine disulfide, alkylphenol disulfide, tetramethylthiuram disulfide, selenium dithiocarbamate and the like. Of these, sulfur is preferred.

The sulfur compound is generally used in an amount of 0.1 to 10 parts by weight, preferably 0.3 to 10 parts by weight, based on 100 parts by weight of the ethylene / α-olefin / non-conjugated polyene copolymer rubber (A).
It is desirable to use in an amount of 5 to 5 parts by weight, more preferably 0.5 to 3 parts by weight.

Examples of the organic peroxide include dicumyl peroxide, 2,5-dimethyl-2,5-di (t-butylperoxy) hexane, 2,5-dimethyl-2,5-di (benzoylperoxy) hexane, 2,5-dimethyl-
2,5-di (t-butylperoxy) hexyne-3, di-t-butyl peroxide, di-t-butylperoxy-3,3,5-trimethylcyclohexane, t-dibutyl hydroperoxide and the like. Among them, dicumyl peroxide, di-t-butyl peroxide and di-t-butylperoxy-3,3,5-trimethylcyclohexane are preferred.

The organic peroxide is ethylene α-olefin
100 g of non-conjugated polyene copolymer rubber (A)
And usually 3 × 10^-3~ 5 × 10^-2Mole, preferably 1 ×
10 ^-3~ 3 × 10^-2Used in molar proportions.

When a sulfur compound is used as a vulcanizing agent, it is preferable to use a vulcanization accelerator in combination. Examples of the vulcanization accelerator include N-cyclohexyl-2-benzothiazolesulfenamide, N-oxydiethylene-2-
Benzothiazolesulfenamide, N, N'-diisopropyl-2-benzothiazolesulfenamide, 2
-Mercaptobenzothiazole, 2- (2,4-dinitrophenyl) mercaptobenzothiazole, 2- (2,2
Thiazole compounds such as 6-diethyl-4-morpholinothio) benzothiazole and dibenzothiazyl-disulfide; guanidine compounds such as diphenylguanidine, triphenylguanidine and diorthotolylguanidine; acetaldehyde-aniline condensate; Aldehyde amine compounds such as aniline condensates;
Imidazoline compounds such as 2-mercaptoimidazoline; thiourea compounds such as diethylthiourea and dibutylthiourea; thiuram compounds such as tetramethylthiuram monosulfide and tetramethylthiuram disulfide; zinc dimethyldithiocarbamate, zinc diethyldithiocarbamate and diethyldithiocarbamate Dithionate compounds such as tellurium; xanthate compounds such as zinc dibutylxanthogenate; and zinc white.

These vulcanization accelerators are used in an amount of 0.1 to 20 parts by weight, preferably 0.2 to 20 parts by weight, based on 100 parts by weight of the ethylene / α-olefin / non-conjugated polyene copolymer rubber (A).
It is desirable to use 10 parts by weight, more preferably 0.5 to 5 parts by weight.

When an organic peroxide is used as a vulcanizing agent, it is preferable to use a vulcanizing aid in combination. Examples of the vulcanization aid include sulfur; quinone dioximes such as p-quinone dioxime; (meth) acrylic compounds such as ethylene glycol dimethacrylate and trimethylolpropane trimethacrylate; diallyl phthalate, triallyl isocyanurate and the like. Allyl compound; other maleimide compounds, divinylbenzene (DVB), and the like.

It is desirable that such a vulcanization aid is used in a proportion of 0.5 to 2 mol, preferably equivalent to 1 mol of the organic peroxide used.

The shape memory rubber composition (C) used in the present invention includes, in addition to the ethylene / α-olefin / non-conjugated polyene copolymer rubber (A) and the polyolefin resin (B), To the extent that the purpose is not impaired,
A rubber other than the component (A) may be compounded. Examples of such other rubbers include natural rubber, styrene / butadiene rubber, nitrile rubber, chloroprene rubber, acrylic rubber, hydrogenated NBR, and the like.

The shape memory rubber composition (C) used in the present invention is obtained by micro-dispersing particles of a polyolefin resin (B) in an ethylene / α-olefin / non-conjugated polyene copolymer rubber (A). Can be manufactured.

In order to micro-disperse the particles of the polyolefin resin (B), 1) the ethylene / α-olefin / non-conjugated polyene copolymer rubber (A) and the polyolefin resin (B) are mixed and melted. A method of imparting a shearing action (shearing force) to the polyolefin-based resin (B) by kneading;
2) A polyolefin resin (B) is added to a rubber mixture comprising an ethylene / α-olefin / non-conjugated polyene copolymer rubber (A) and an organic solvent, and the rubber mixture and the polyolefin resin (B) are kneaded. A method of removing the solvent and the like can be mentioned.

According to such a method, the morphology (phase morphology) in which the polyolefin resin (B) is micro-dispersed in the shape memory rubber composition (C) can be achieved, but the temperature at the time of kneading is low, and When the force energy is insufficient, the average dispersed particle diameter of the polyolefin resin (B) tends to be large, and when the average dispersed particle diameter of the polyolefin resin (B) exceeds 200 μm, the strength of the obtained lining tube is reduced. Alternatively, the fluidity of the polyolefin-based resin (B) tends to decrease, and the workability tends to be impaired.

The preparation of the shape-memory rubber composition (C) used in the present invention is preferably carried out using a kneading apparatus capable of giving a high shearing force. Specifically, the mixing can be performed using a kneading device such as a mixing roll, an intensive mixer (for example, a Banbury mixer, a kneader, etc.), a single-screw or twin-screw extruder. It is preferred to prepare the rubber composition (C). By kneading with a twin-screw extruder, the shape-memory rubber composition (C) in which the polyolefin-based resin (B) is dispersed at the average dispersed particle diameter can be easily prepared.

When another component such as a compounding agent is added to the shape memory rubber composition (C) used in the present invention, the ethylene / α-olefin / non-conjugated polyene copolymer rubber (A) is added by the above method. Polyolefin resin (B) inside
It is preferable that after preparing a rubber composition in which is dispersed microscopically, other components are added to the rubber composition and kneaded to prepare a shape-memory rubber composition (C) containing the other components. The other components can be compounded using a kneading device such as a mixing roll, an intensive mixer (for example, a Banbury mixer, a kneader, etc.), a single-screw or twin-screw extruder.

As the method 1), the following method is specifically exemplified. That is, the ethylene / α-olefin / non-conjugated polyene copolymer rubber (A) and the polyolefin-based resin (B) are 200-200 extruded by a twin-screw extruder.
Mix and knead at 350 ° C. for 0.5-1.5 minutes. At this time, when the polyolefin-based resin (B) is a propylene homopolymer, the specific energy of the propylene homopolymer is set to 0.0 in a twin-screw extruder at a temperature of 200 ° C.
1 kW · hr / kg or more, preferably 0.02 kW · h
It is desirable to knead in a molten state so as to give r / kg or more. Next, the obtained kneaded product and other components such as a compounding agent are kneaded using a mixer such as a Banbury mixer to prepare a shape memory rubber composition (C) used in the present invention.

As the method 2), the following method is specifically exemplified. That is, a rubber mixture comprising 100 parts by weight of an ethylene / α-olefin / non-conjugated polyene copolymer rubber (A) and 3 to 10 parts by weight of an organic solvent is introduced into the extruder from a supply section of a multi-stage vented extruder. Then, the polyolefin resin (B) is introduced into the extruder from another supply section under an inert gas atmosphere, and the rubber mixture and the polyolefin resin (B) are kneaded and the solvent is removed. Thereafter, other components such as a compounding agent are kneaded in the same manner as in 1) to prepare the shape-memory rubber composition (C) used in the present invention.

The lining tube of the present invention can be molded by a general-purpose extruder using the above-mentioned shape-memory rubber composition (C). The extruder can be used as a single screw extruder or a twin screw extruder. As the molding die, a general tubing die can be used.

When a crosslinked resin is used for the lining tube, a vulcanizing agent, a vulcanizing aid and the like are additionally mixed with the resin composition (C) by using rolls such as open rolls. Then, using the adjusted resin composition (C), the tubular molded body is vulcanized to produce a lining tube. That is, the vulcanizable shape-memory rubber composition (C) is molded into a straight tube by a known molding method such as extrusion molding, and simultaneously with or after this molding, the polyolefin resin ( Vulcanization at a temperature not lower than the melting point or softening point of B).

In the lining tube obtained as described above, the particles of the polyolefin-based resin (B) contain ethylene / α
The olefin has a morphology of micro-dispersed in the olefin / non-conjugated polyene copolymer rubber (A) and is deformed by heating to a temperature higher than the melting point or softening point of the polyolefin resin (B), When cooled to a temperature lower than the melting point or softening point of B), the deformed shape is maintained, and when heated to a temperature higher than the melting point or softening point of the polyolefin-based resin (B), the original shape is restored. Excellent.

Hereinafter, a method for lining an existing pipe using a lining pipe using the above-mentioned shape memory rubber composition will be described with reference to the drawings.

A lining pipe molded using the above shape memory rubber composition (C) and having an outer diameter slightly larger than the inner diameter of the existing steel pipe is included in the shape memory rubber composition (C). The polyolefin resin (B) is heated to a temperature equal to or higher than the melting point or softening point (hereinafter, simply referred to as a first temperature) to reduce the diameter.

In the method of reducing the diameter, the outer diameter is reduced by stretching in the length direction (FIG. 1 (2)), and the outer diameter is reduced by uniformly pressing and compressing in the circumferential direction (FIG. 1 (2)). 3)), a method of compressing into a plate shape and folding it to reduce the size (FIG. 1 (4)), folding it into a U-shape and reducing the size (FIG. 1 (5)), etc. are used.

After the diameter is reduced by any of the above methods, the shape is cooled to a temperature lower than the first temperature, preferably around room temperature, and deformed to maintain the shape. In that state,
For example, it is inserted into the existing pipe as shown in FIG. At this time, since the lining pipe has sufficient flexibility, it can be easily inserted into a bent pipe such as a 90-degree elbow. Next, a fluid (liquid, steam, air, or the like) having a temperature equal to or higher than the first temperature is passed through the lining tube to heat the lining tube to recover the shape (FIG. 2B).

According to the above-described method, after the resin pipe is passed through the existing pipe, the resin pipe is expanded simply by passing the heated liquid or gas through the resin pipe, so that the lining can be adhered to the inner wall of the existing pipe. Therefore, lining for repair of existing pipes can be easily performed without cutting.

The lining tube of the present invention can
It may be formed of a multilayer tube having two or more layers. As the configuration of the multilayer tube, a configuration in which a tubular layer made of another thermoplastic resin (D) is laminated on the inner layer side and / or the outer layer side of the tubular layer made of the shape memory rubber composition (C), For example, a configuration in which a tubular layer made of another thermoplastic resin (D) is laminated between two tubular layers made of the shape memory rubber composition (C) is used.

Other thermoplastic resin (D) used here
Can be appropriately selected according to the application, for example, for water pipe applications, polypropylene, polyethylene, polyethylene terephthalate, polybutene, ionomer resin, etc., which are safe for food hygiene and have good chlorine resistance, are used for gas pipe applications. If so, polyethylene terephthalate, polyvinyl chloride, polyvinyl alcohol, polyamide, etc., which have excellent gas barrier properties, are preferably used. The tubular layer made of the thermoplastic resin (D) is preferably used as a thin film in order to follow the shape change of the shape memory rubber composition.

Although the lining tube of the present invention has a sufficient flexibility by containing a rubber component as a main component, the corrugated tube having a bellows-like shape further improves the flexibility. Lining tube.

[0078]

The lining pipe of the present invention is excellent in shape memory. Therefore, after the diameter is reduced by heating, the lining pipe is cooled and inserted into the existing pipe while maintaining the shape, and then the heating fluid is passed through the lining pipe only. Can be inflated and brought into close contact with the inner wall of the existing pipe, which is suitable for lining for repairing the existing pipe without cutting. Further, since the lining pipe of the present invention contains a rubber component as a main component, it can be easily inserted into a pipe having many bends.

According to the lining method of the present invention, the lining is excellent in resistance to aging cracks and cracks caused by strong ground motions such as earthquakes, and enables long-term reliable lining.

[0080]

Next, an embodiment of the present invention will be described. The materials used in each example are as follows.

<< Materials Used >> 1) EPDM: Mitsui Chemicals, Inc. Mitsui EPT-3090E
(Trademark), ethylene / propylene / 5-ethylidene-2-norbornene copolymer, paraffin-based oil 10 parts by weight oil, ethylene / propylene (molar ratio) = 68/32, iodine value = 12・ ・ (A) component 2) Polypropylene: J-300 manufactured by Grand Polymer Co., Ltd.
(Trademark), Vicat softening point = 150 ° C., melting point = 160 ° C.
(B) component 3) Polybutene: M2481 manufactured by Mitsui Chemicals, Inc., Vicat softening point = 70 ° C., melting point = 75 ° C. (B) component 4 ) EBT: K9720 manufactured by Mitsui Chemicals, Inc., Vicat softening point = 50 ° C., melting point = 60 ° C. (B) component 5) Zinc flower 2 types: Sakai Chemical 6) Stearic acid: manufactured by Kao Corporation 7) FEF carbon black: Show Black N-550 (trademark) manufactured by Showa Cabot Co., Ltd. 8) Paraffin-based oil: Diana Process Oil PW-90 (trademark) manufactured by Idemitsu Kosan Co., Ltd. 9 ) Defoaming agent: Vesta PP (trademark) manufactured by Inoue Lime Co., Ltd. 10) Vulcanization accelerator CBS: Suncellar CM (trademark) manufactured by Sanshin Chemical Industry Co., Ltd. 11) Vulcanization accelerator ZnBDC: Sanshin Chemical Industry ( 12) Vulcanization accelerator TMTD: manufactured by Sanshin Chemical Industry Co., Ltd. 13) Vulcanization accelerator EU: 13) Suncellar 2 manufactured by Sanshin Chemical Industry Co., Ltd.
2 (trademark) 14) Vulcanization accelerator TeEDC: Suncellar TE (trademark) manufactured by Sanshin Chemical Industry Co., Ltd. 15) Morpholine vulcanizing agent: Sanfel R (trademark) manufactured by Sanshin Chemical Industry Co., Ltd. 16) Sulfur

(Example 1) << Preparation of EPDM containing shape-imparting resin >> The compound shown in Table 1 was mixed with the EPDM and polypropylene as a component of the shape-imparting resin (B) in a 1.7-liter Mixtron mixer manufactured by Kobe Steel Ltd. The mixture was kneaded at a temperature higher than the Vicat softening point of the component (B) by at least 20 ° C. for about 5 minutes to uniformly microdisperse the polypropylene in EPDM. After discharging from the mixer, the mixture is naturally cooled, and the resin E containing the shape-imparting resin is cooled.
PDM (B-1) was prepared.

<< Preparation of Rubber Composition >> Next, Kobe Steel, Ltd.
The zinc oxide, stearic acid, FEF carbon black, and paraffin oil are mixed in the EPDM (B-1) containing the shape-imparting resin obtained above in a 1.7-liter Mixtron mixer manufactured by K.K. And kneaded for about 7 minutes. Then, after discharging from the mixer, the mixture was naturally cooled.
The temperature of the kneaded material immediately after being discharged from the mixer was 170 ° C. The defoaming agent, the vulcanization accelerator, the morpholine vulcanizing agent and the sulfur were added to each of the kneaded materials by an 8-inch open roll at the compounding ratio shown in Table 1, and kneaded, followed by kneading, and a vulcanizable rubber composition (C -1) was obtained.

[0084]

[Table 1]

<< Molding of Tube Made of Shape Memory Rubber Composition >> The rubber composition (C-1) obtained as described above.
Was cut out of a roll into a ribbon. Then, the outer diameter 2
This ribbon is extruded while being fed to a uniaxial 50 mmφ rubber extruder equipped with a die having a diameter of 0 mmφ and an inner diameter of 15 mmφ, and is heated at 100 ° C. for 12 minutes and at 180 ° C. for 15 minutes in a HAV (hot air vulcanizing tank). The tube was formed by vulcanizing in two stages under the conditions. This was exposed to hot air at a temperature of 200 ° C. for 3 minutes, stretched in the longitudinal direction to reduce the diameter, and then
It was cooled in water at 0 ° C. and shaped. After that, the temperature is 200 ° C
Was passed through a tube for 3 minutes and allowed to cool to room temperature, and then the shape recovery rate was examined. Table 2 shows the results. The deformation rate (%) in the table is obtained by [molded tube outer diameter / shaped tube outer diameter] × 100, and the shape recovery rate (%) is [tube outer diameter after reheating / molded tube outer diameter]. ] × 100.

[0086]

[Table 2]

(Example 2) A tube made of a shape memory rubber composition was formed in the same manner as in Example 1 except that polybutene was used instead of polypropylene as the component (B) for imparting shape. This was exposed to hot air at a temperature of 120 ° C. for 2 minutes, stretched in the longitudinal direction, and reduced in diameter.
It was cooled in water at ℃ and shaped. After that, hot air at a temperature of 120 ° C. was passed through the tube for 2 minutes and allowed to cool to room temperature, and then the shape recovery rate was examined. Table 3 shows the results.

[0088]

[Table 3]

Example 3 Table 1 shows the mixing ratio of the rubber composition.
A tube made of a shape-memory rubber composition was molded in the same manner as in Example 1 except that the above procedure was repeated. Temperature 80
The film was exposed to warm water at 30 ° C. for 30 seconds, stretched in the longitudinal direction to reduce the diameter, and then cooled in water at 20 ° C. to shape. Thereafter, warm water at a temperature of 80 ° C. was passed through the tube for 30 seconds and allowed to cool to room temperature, and then the shape recovery rate was examined. Table 4 shows the results.

[0090]

[Table 4]

[Brief description of the drawings]

FIG. 1 is a schematic sectional view of a lining tube according to the present invention. (1) FIG. 1 is a schematic cross-sectional view showing a lining tube after molding. (2) It is a cross-sectional schematic diagram which shows the lining tube extended in the length direction. (3) It is a cross-sectional schematic diagram showing the lining pipe uniformly pressurized and compressed in the circumferential direction. (4) It is a schematic diagram showing a lining tube compressed in a plate shape. (5) It is a schematic diagram showing a lining tube folded in a U-shape.

FIG. 2 is an explanatory diagram showing a procedure of a lining method according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lining pipe 2 Rubber component 3 Polyolefin resin component 4 Steel pipe

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C08L 25/06 C08L 25/06 55/00 55/00 55/02 55/02 F16L 1/00 F16L 1 / 00 J 55/16 55/16 // B29K 23:00 B29L 23:00 (72) Inventor Seiji Ota 1-2-1, Waki, Waki-machi, Kuga-gun, Yamaguchi Prefecture Inside Mitsui Chemicals, Inc. (72) Inventor Nakahama Hideyoshi 3rd Chikusa Beach, Ichihara City, Chiba Prefecture Mitsui Chemicals Co., Ltd. (72) Inventor Yuji Ishii 3rd Chikusa Beach, Ichihara City, Chiba Prefecture Mitsui Chemicals Co., Ltd. F term (reference) 3H025 EA01 EB23 4F071 AA12 AA14 AA15 AA20 AA21 AA22 AA32. 32 BC032 BC062 BC072 BC092 BN152 BP021 FD140 FD150 GM00

Claims (9)

[Claims] 1. A composition comprising ethylene, an α-olefin having 3 to 20 carbon atoms, an ethylene / α-olefin / non-conjugated polyene copolymer rubber (A) comprising a non-conjugated polyene and a polyolefin-based resin (B). A lining tube using a shape memory rubber composition (C) made of a material. 2. The polyolefin resin (B) is 10 to 50 parts by weight based on 100 parts by weight of the ethylene / α-olefin / non-conjugated polyene copolymer rubber (A). 2. The lining tube according to claim 1, comprising: 3. The lining tube according to claim 1, wherein the ethylene / α-olefin / non-conjugated polyene copolymer rubber (A) is an ethylene / propylene / non-conjugated diene copolymer rubber. 4. The lining tube according to claim 1, wherein the polyolefin resin (B) has a Vicat softening point of 50 ° C. or more and 160 ° C. or less. 5. The polyolefin resin (B) is polypropylene, polybutene, ethylene / butene terpolymer (EBT), polystyrene, ABS resin, ethylene /
The lining tube according to any one of claims 1 to 4, wherein the lining tube is at least one resin selected from a methacrylic acid copolymer and an ionomer resin. 6. A tubular layer made of another thermoplastic resin (D) is laminated on an inner layer side and / or an outer layer side of the tubular layer made of the shape memory rubber composition (C).
A lining tube according to any one of claims 1 to 5. 7. The method according to claim 1, wherein a tubular layer made of another thermoplastic resin (D) is laminated between two tubular layers made of the shape memory rubber composition (C). The lining tube as described. 8. The lining pipe according to claim 1, wherein the lining pipe is a corrugated pipe having a bellows shape. 9. A composition comprising ethylene, an α-olefin having 3 to 20 carbon atoms, an ethylene / α-olefin / non-conjugated polyene copolymer rubber (A) comprising a non-conjugated polyene, and a polyolefin-based resin (B). A lining pipe having an outer diameter slightly larger than the inner diameter of an existing pipe to be lined is formed using the shape-memory rubber composition (C) made of a material, and then the lining pipe is made of a polyolefin resin (B). Is heated to a temperature higher than the melting point or softening point of the polyolefin resin to deform it into a shape that can be inserted into an existing pipe, and then cooled to a temperature lower than the melting point or softening point of the polyolefin resin (B) to maintain its shape. After inserting the lining pipe into the existing pipe, a fluid having a temperature equal to or higher than the melting point or softening point of the polyolefin resin (B) is passed through the lining pipe and heated. Lining method of the existing pipe by which to restore the inning tube to its original shape is brought into close contact with existing pipe surface.