Composition for rehabilitation pipe, rehabilitation pipe, and method for producing rehabilitation pipe

Abstract

To provide a composition for a rehabilitation pipe that is capable of producing a rehabilitation pipe having improved workability and also enhanced mechanical strength and impact resistance at low temperature.SOLUTION: A composition for a rehabilitation pipe according to the present invention comprises: a graft copolymer (A) of a (meth)acrylic copolymer and a vinyl monomer, a copolymer (B) of acrylonitrile and butadiene, an anti-coagulant (C), and an impact resistance modifier (D), wherein the graft copolymer (A) is a non-crosslinked copolymer, the anti-coagulant (C) is free of metal or contains 5 wt.% or less of metal, the content of the copolymer (B) is 3 pts.mass or more to 20 pts.mass or less relative to 100 pts.mass of the graft copolymer (A), and the content of the impact resistance modifier (D) is 3 pts.mass or more to 15 pts.mass or less relative to 100 pts.mass of the graft copolymer (A).SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a rehabilitating pipe composition used to obtain a rehabilitating pipe. The present invention also relates to a rehabilitating pipe using the rehabilitating pipe composition, and a method for manufacturing a rehabilitating pipe using the rehabilitating pipe composition. [Background technology]

[0002] The Omega Liner method is known as one method for rehabilitating aging existing pipes. The Omega Liner method is generally carried out in the following steps: (1) The folded rehabilitation pipe is placed inside the existing pipe. (2) The rehabilitation pipe is heated with steam. (3) The diameter of the rehabilitation pipe is expanded with compressed air, so that the inner surface of the existing pipe and the outer surface of the rehabilitation pipe are tightly attached.

[0003] The following Patent Documents 1 and 2 disclose vinyl chloride resin compositions for rehabilitating pipes.

[0004] The vinyl chloride resin composition for rehabilitating pipes described in Patent Document 1 below contains 100 parts by weight of a composite vinyl chloride resin having an average degree of polymerization of 400 to 2500 and 3 to 30 parts by weight of a thermoplastic elastomer compatible with the composite vinyl chloride resin. The composite vinyl chloride resin is a resin obtained by graft copolymerizing more than 10% by weight but not more than 40% by weight of an acrylic copolymer with a vinyl chloride monomer or a vinyl chloride monomer and other copolymerizable monomers at least 60% by weight but less than 90% by weight. The acrylic copolymer is a copolymer obtained by copolymerizing 100 parts by weight of a specific acrylic monomer component with 0.01 to 30 parts by weight of a polyfunctional monomer component.

[0005] The vinyl chloride resin composition for rehabilitating pipes described in Patent Document 2 below contains, as a main resin component, a mixture of a first polyvinyl chloride resin having an average degree of polymerization of 1000 to 1100 and a second polyvinyl chloride resin having an average degree of polymerization of 750 to 850, or contains only the first polyvinyl chloride resin. The vinyl chloride resin composition for rehabilitating pipes also contains a non-lead-based stabilizer and one or more modifiers selected from the group consisting of MMA-based modifiers, MBS-based modifiers, and CPE-based modifiers. The modifier is blended in an amount of 3 to 25 parts by weight per 100 parts by weight of the main resin component. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2002-003689 [Patent Document 2] Japanese Patent Application Publication No. 2020-105290 Summary of the Invention [Problem to be solved by the invention]

[0007] The mechanical strength of a rehabilitating pipe obtained using the vinyl chloride resin composition for rehabilitating pipes described in Patent Document 1 can be increased to a certain extent. However, the impact resistance at low temperatures (e.g., -10°C to 10°C) of a rehabilitating pipe obtained using the vinyl chloride resin composition for rehabilitating pipes described in Patent Document 1 cannot be sufficiently increased, and the rehabilitating pipe may be damaged when used in a low-temperature environment.

[0008] A rehabilitating pipe obtained using the vinyl chloride resin composition for rehabilitating pipes described in Patent Document 2 has a relatively large storage modulus at around 80° C. Therefore, even if a folded rehabilitating pipe is heated, the rehabilitating pipe may not be able to satisfactorily restore to its original shape (tubular shape), and the workability of the rehabilitating pipe may be poor.

[0009] The object of the present invention is to provide a rehabilitating pipe composition that can improve the workability of the resulting rehabilitating pipe and can increase the mechanical strength and low-temperature impact resistance of the resulting rehabilitating pipe. Another object of the present invention is to provide a rehabilitating pipe and a method for manufacturing a rehabilitating pipe using the rehabilitating pipe composition. [Means for solving the problem]

[0010] This specification discloses the following rehabilitating pipe composition, rehabilitating pipe, and method for manufacturing a rehabilitating pipe.

[0011] Item 1. A composition for rehabilitating pipes, comprising a graft copolymer of a (meth)acrylic copolymer and a vinyl monomer, a copolymer of acrylonitrile and butadiene, an anti-agglomerating agent, and an impact resistance modifier, wherein the copolymer of acrylonitrile and butadiene is a non-crosslinked copolymer, the anti-agglomerating agent does not contain metal or contains metal in an amount of 5% by weight or less, the content of the copolymer of acrylonitrile and butadiene is 3 parts by weight or more and 20 parts by weight or less per 100 parts by weight of the graft copolymer of the (meth)acrylic copolymer and a vinyl monomer, and the content of the impact resistance modifier is 3 parts by weight or more and 15 parts by weight or less per 100 parts by weight of the graft copolymer of the (meth)acrylic copolymer and a vinyl monomer.

[0012] Item 2. The composition for pipe rehabilitation according to Item 1, wherein the particle diameter of the particles of the copolymer of acrylonitrile and butadiene is 5 mm or less.

[0013] Item 3. The composition for rehabilitating pipes according to Item 1 or 2, wherein the content of the (meth)acrylic copolymer is 1% by weight or more and 30% by weight or less in 100% by weight of the material of the graft copolymer of the (meth)acrylic copolymer and the vinyl monomer.

[0014] Item 4. The composition for pipe rehabilitation according to any one of Items 1 to 3, wherein the material of the (meth)acrylic copolymer in the graft copolymer of the (meth)acrylic copolymer and a vinyl monomer contains a (meth)acrylate having an alkyl group, and the glass transition temperature of a homopolymer of the (meth)acrylate having an alkyl group is -140°C or higher and -20°C or lower.

[0015] Item 5. A rehabilitating pipe formed from the composition for rehabilitating a pipe according to any one of items 1 to 4.

[0016] Item 6. A method for manufacturing a rehabilitating pipe, comprising a step of molding the rehabilitating pipe composition according to any one of items 1 to 4. [Effects of the Invention]

[0017] The pipe rehabilitating composition of the present invention comprises a graft copolymer of a (meth)acrylic copolymer and a vinyl monomer, a copolymer of acrylonitrile and butadiene, an anti-agglomerating agent, and an impact modifier. In the pipe rehabilitating composition of the present invention, the acrylonitrile and butadiene copolymer is a non-crosslinked copolymer. In the pipe rehabilitating composition of the present invention, the anti-agglomerating agent does not contain metal or contains metal in an amount of 5% by weight or less. In the pipe rehabilitating composition of the present invention, the content of the acrylonitrile and butadiene copolymer is 3 to 20 parts by weight per 100 parts by weight of the graft copolymer of the (meth)acrylic copolymer and a vinyl monomer. In the pipe rehabilitating composition of the present invention, the content of the impact modifier is 3 to 15 parts by weight per 100 parts by weight of the graft copolymer of the (meth)acrylic copolymer and a vinyl monomer. The rehabilitating pipe composition of the present invention has the above-mentioned configuration, which makes it possible to improve the workability of the resulting rehabilitating pipe and to increase the mechanical strength and impact resistance at low temperatures of the resulting rehabilitating pipe. [Brief explanation of the drawings]

[0018] [Figure 1] 1(a) to 1(c) are cross-sectional views for explaining each step of the method for rehabilitating an existing pipe. DETAILED DESCRIPTION OF THE INVENTION

[0019] The present invention will be described in detail below.

[0020] (Composition for rehabilitated pipes) The pipe rehabilitating composition of the present invention contains a graft copolymer (A) of a (meth)acrylic copolymer and a vinyl monomer, a copolymer (B) of acrylonitrile and butadiene, an anti-agglomerating agent (C), and an impact modifier (D). In the pipe rehabilitating composition of the present invention, the acrylonitrile and butadiene copolymer (B) is a non-crosslinked copolymer. In the pipe rehabilitating composition of the present invention, the anti-agglomerating agent (C) does not contain metal or contains metal in an amount of 5% by weight or less. In the pipe rehabilitating composition of the present invention, the content of the acrylonitrile and butadiene copolymer (B) is 3 to 20 parts by weight per 100 parts by weight of the graft copolymer (A) of a (meth)acrylic copolymer and a vinyl monomer. In the pipe rehabilitating composition of the present invention, the content of the impact modifier (D) is 3 to 15 parts by weight per 100 parts by weight of the graft copolymer (A) of a (meth)acrylic copolymer and a vinyl monomer.

[0021] The rehabilitating pipe composition of the present invention has the above-mentioned configuration, which makes it possible to improve the workability of the resulting rehabilitating pipe and to increase the mechanical strength and impact resistance at low temperatures of the resulting rehabilitating pipe.

[0022] The pipe rehabilitation composition according to the present invention can, for example, relatively reduce the storage modulus of the resulting rehabilitating pipe at around 80°C. Therefore, when the folded rehabilitating pipe is heated, the rehabilitating pipe can be smoothly restored to its original (tubular) shape, improving the workability of the rehabilitating pipe. Furthermore, the pipe rehabilitation composition according to the present invention can, for example, moderately increase the flexural modulus of the resulting rehabilitating pipe at around 25°C, thereby enhancing the mechanical strength of the rehabilitating pipe. Furthermore, the pipe rehabilitation composition according to the present invention can increase the impact resistance at low temperatures (e.g., -10°C to 10°C), thereby suppressing breakage of the rehabilitating pipe even when used at low temperatures. Therefore, the pipe rehabilitation composition according to the present invention can be used to successfully rehabilitate existing pipes using the resulting rehabilitating pipe by the Omega Liner construction method.

[0023] The details of each component used in the pipe rehabilitation composition according to the present invention are explained below. In this specification, "(meth)acrylic" means either or both of "acrylic" and "methacrylic", and "(meth)acrylate" means either or both of "acrylate" and "methacrylate".

[0024] [Graft copolymer (A) of (meth)acrylic copolymer and vinyl monomer] The composition for rehabilitating pipes contains a graft copolymer (A) (hereinafter, sometimes referred to as graft copolymer (A)) of a (meth)acrylic copolymer (A1) and a vinyl monomer (A2). The material of the graft copolymer (A) contains the (meth)acrylic copolymer (A1) and the vinyl monomer (A2). The graft copolymer (A) is a reaction product of the (meth)acrylic copolymer (A1) and the vinyl monomer (A2). The graft copolymer (A) has a structural portion derived from the (meth)acrylic copolymer (A1) and a structural portion derived from the vinyl monomer (A2). The graft copolymer (A) is a composite resin.

[0025] Because the above-mentioned rehabilitating pipe composition contains the above-mentioned graft copolymer (A), the elastic modulus of the rehabilitating pipe is appropriately reduced, thereby improving the workability of the resulting rehabilitating pipe. The above-mentioned graft copolymer (A) exhibits rubber properties, so it effectively reduces the elastic modulus of the above-mentioned rehabilitating pipe composition. As a result, the workability of the resulting rehabilitating pipe is improved. Furthermore, because the above-mentioned rehabilitating pipe composition contains the above-mentioned graft copolymer (A), it can also improve impact resistance at low temperatures.

[0026] The graft copolymer (A) can be obtained by graft copolymerizing the (meth)acrylic copolymer (A1) with the vinyl monomer (A2). In the graft copolymer (A), it is preferable that the vinyl monomer (A2) is graft copolymerized with the (meth)acrylic copolymer (A1).

[0027] The weight average molecular weight of the graft copolymer (A) is preferably at least 400, more preferably at least 800, and is preferably at most 2500, more preferably at most 2000. When the weight average molecular weight of the graft copolymer (A) is at least the above lower limit and at most the above upper limit, the effects of the present invention can be more effectively exhibited.

[0028] The weight average molecular weight of the graft copolymer (A) means a weight average molecular weight measured by gel permeation chromatography (GPC) in terms of polystyrene.

[0029] The graft copolymer (A) may be in the form of particles. The graft copolymer (A) may be graft copolymer (A) particles (particles of the graft copolymer (A)). The particles of the graft copolymer (A) may be particles having a core-shell structure. The graft copolymer (A) may have a core-shell structure. From the viewpoint of improving impact resistance at low temperatures, when the graft copolymer (A) has a core-shell structure, it is preferable that the graft copolymer (A) has a structural portion derived from the (meth)acrylic copolymer (A1) as a core portion and a structural portion derived from the vinyl monomer (A2) as a shell portion.

[0030] Commercially available products can also be used as the graft copolymer (A), such as "AG64T" manufactured by Tokuyama Sekisui Kogyo Co., Ltd.

[0031] <(Meth)acrylic copolymer (A1)> The material for the (meth)acrylic copolymer (A1) contains a (meth)acrylic monomer. The (meth)acrylic copolymer (A1) has a structural portion derived from the (meth)acrylic monomer. As the (meth)acrylic monomer, a conventionally known (meth)acrylic monomer can be used. The (meth)acrylic monomer may be used alone or in combination of two or more.

[0032] Examples of the (meth)acrylic monomer include (meth)acrylic monomers having an alkyl group, (meth)acrylic monomers having a hydroxyl group, (meth)acrylic monomers having a carboxyl group, and (meth)acrylic monomers having a glycidyl group. Examples of the (meth)acrylic monomer include (meth)acrylates having an alkyl group, (meth)acrylates having a hydroxyl group, (meth)acrylates having a carboxyl group, and (meth)acrylates having a glycidyl group. The (meth)acrylic monomers may be used alone or in combination of two or more.

[0033] Examples of the (meth)acrylic monomer having an alkyl group include methyl (meth)acrylate, ethyl (meth)acrylate, n-propyl (meth)acrylate, n-butyl (meth)acrylate, isobutyl (meth)acrylate, sec-butyl (meth)acrylate, n-hexyl (meth)acrylate, normal butyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, isooctyl (meth)acrylate, n-nonyl (meth)acrylate, isononyl (meth)acrylate, n-decyl (meth)acrylate, lauryl (meth)acrylate, and octyl (meth)acrylate. The (meth)acrylic monomer may be an alkyl (meth)acrylate or may contain an alkyl (meth)acrylate.

[0034] Examples of the (meth)acrylic monomer having a hydroxyl group include 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate, and trimethylolpropane di(meth)acrylate.

[0035] Examples of the (meth)acrylic monomer having a carboxyl group include (meth)acrylic acid, crotonic acid, itaconic acid, and citraconic acid.

[0036] Examples of the (meth)acrylic monomer having a glycidyl group include glycidyl (meth)acrylate and 4-hydroxybutyl (meth)acrylate glycidyl ether.

[0037] Furthermore, examples of (meth)acrylic monomers other than the (meth)acrylic monomers listed above include phenyl(meth)acrylate, 2-chloroethyl(meth)acrylate, phenylmethyl(meth)acrylate, ethylene glycol di(meth)acrylate, diethylene glycol di(meth)acrylate, 1,6-hexanediol di(meth)acrylate, and trimethylolpropane tri(meth)acrylate.

[0038] From the viewpoint of further improving the workability of the resulting rehabilitating pipe, the (meth)acrylic monomer preferably contains a (meth)acrylate having an alkyl group, more preferably contains an alkyl(meth)acrylate, and even more preferably contains ethyl(meth)acrylate. From the viewpoint of further improving the workability of the resulting rehabilitating pipe, the material of the (meth)acrylic copolymer (A1) in the graft copolymer (A) of the (meth)acrylic copolymer (A1) and the vinyl monomer (A2) preferably contains a (meth)acrylate having an alkyl group, more preferably contains an alkyl(meth)acrylate, and even more preferably contains ethyl(meth)acrylate.

[0039] From the viewpoint of further improving the workability of the resulting rehabilitated pipe, the number of carbon atoms in the alkyl group of the (meth)acrylate having the above alkyl group is preferably 1 or more, more preferably 2 or more, and preferably 20 or less, more preferably 10 or less, even more preferably 6 or less, even more preferably 4 or less, and particularly preferably 3 or less.

[0040] From the viewpoint of further improving workability, the glass transition temperature of the homopolymer of the (meth)acrylate having the alkyl group is preferably −140° C. or higher, more preferably −120° C. or higher, even more preferably −100° C. or higher, and is preferably −20° C. or lower, more preferably −30° C. or lower, even more preferably −40° C. or lower.

[0041] The glass transition temperature of the homopolymer of the alkyl group-containing (meth)acrylate can be measured by differential scanning calorimetry (DSC) in accordance with JIS K6240.

[0042] The (meth)acrylic copolymer (A1) can be obtained by copolymerizing the (meth)acrylic monomer with a monomer copolymerizable with the (meth)acrylic monomer.

[0043] Examples of the monomer copolymerizable with the (meth)acrylic monomer include polyfunctional allyl compounds such as diallyl phthalate, diallyl maleate, and triallyl isocyanurate; unsaturated compounds such as butadiene; etc. The monomer copolymerizable with the (meth)acrylic monomer may be used alone or in combination of two or more.

[0044] The (meth)acrylic copolymer (A1) may be in the form of particles. The (meth)acrylic copolymer (A1) may be in the form of (meth)acrylic copolymer (A1) particles (particles of the (meth)acrylic copolymer (A1)). The specific shape of the particles may be pellet-like or flat.

[0045] The content of the (meth)acrylic copolymer (A1) in 100% by weight of the material for the graft copolymer (A) of the (meth)acrylic copolymer (A1) and the vinyl monomer (A2) is preferably 1% by weight or more, more preferably 5% by weight or more, and even more preferably 10% by weight or more. The content of the (meth)acrylic copolymer (A1) in 100% by weight of the material for the graft copolymer (A) of the (meth)acrylic copolymer (A1) and the vinyl monomer (A2) is preferably 30% by weight or less, more preferably 25% by weight or less, and even more preferably 20% by weight or less. When the content of the (meth)acrylic copolymer (A1) is above the above lower limit and below the above upper limit, the workability of the resulting rehabilitating pipe can be further improved. The content of the (meth)acrylic copolymer (A1) in 100% by weight of the material for the graft copolymer (A) of the (meth)acrylic copolymer (A1) and the vinyl monomer (A2) is preferably above the above lower limit and below the above upper limit.

[0046] From the viewpoint of further improving the workability of the obtained rehabilitating pipe, the content of the (meth)acrylate having the alkyl group in 100% by weight of the material of the (meth)acrylic copolymer (A1) is preferably 70% by weight or more, more preferably 80% by weight or more, and even more preferably 90% by weight or more. There is no particular upper limit to the content of the (meth)acrylate having the alkyl group in 100% by weight of the material of the (meth)acrylic copolymer (A1). The content of the (meth)acrylate having the alkyl group in 100% by weight of the material of the (meth)acrylic copolymer (A1) may be 99% by weight or less, or may be 95% by weight or less.

[0047] From the viewpoint of further improving the workability of the obtained rehabilitating pipe, the content of the alkyl (meth)acrylate in 100% by weight of the material for the (meth)acrylic copolymer (A1) is preferably 70% by weight or more, more preferably 80% by weight or more, and even more preferably 90% by weight or more. There is no particular upper limit for the content of the alkyl (meth)acrylate in 100% by weight of the material for the (meth)acrylic copolymer (A1). The content of the alkyl (meth)acrylate in 100% by weight of the material for the (meth)acrylic copolymer (A1) may be 99% by weight or less, or may be 95% by weight or less.

[0048] <Vinyl Monomer (A2)> Examples of the vinyl monomer (A2) include vinyl chloride and vinyl monomers other than vinyl chloride. Examples of the vinyl monomer other than vinyl chloride include vinyl esters such as vinyl acetate, vinyl propionate, and vinyl ether; cyano group-containing compounds such as acrylonitrile; halogen compounds such as vinylidene chloride and vinyl fluoride; olefins such as ethylene and propylene; carboxyl group-containing compounds such as itaconic acid, maleic acid, and fumaric acid; non-aromatic carboxylic acid anhydrides such as maleic anhydride; acrylic acid esters such as methyl methacrylate and ethyl methacrylate; and imide compounds such as maleimide. The vinyl monomer (A2) may be used alone or in combination of two or more.

[0049] In order to more effectively exert the effects of the present invention, the vinyl monomer (A2) preferably contains acrylonitrile or vinyl chloride, and more preferably contains vinyl chloride.

[0050] The content of the vinyl monomer (A2) in 100% by weight of the graft copolymer (A) of the (meth)acrylic copolymer (A1) and the vinyl monomer (A2) is preferably 70% by weight or more, more preferably 75% by weight or more, and even more preferably 80% by weight or more, and is preferably 99% by weight or less, more preferably 98% by weight or less. When the content of the vinyl monomer (A2) is equal to or more than the above lower limit and equal to or less than the above upper limit, excellent impact resistance at low temperatures can be effectively exhibited.

[0051] The content of the vinyl chloride in 100% by weight of the vinyl monomer (A2) is preferably 50% by weight or more, more preferably 60% by weight or more, even more preferably 70% by weight or more, particularly preferably 80% by weight or more, and most preferably 90% by weight or more, and is preferably 100% by weight or less. When the content of the vinyl chloride is equal to or more than the above lower limit and equal to or less than the above upper limit, the effects of the present invention can be more effectively exhibited.

[0052] <Other details of graft copolymer (A)> The material for the graft copolymer (A) may contain a (meth)acrylic copolymer (A1), a vinyl monomer (A2), and a component other than the (meth)acrylic copolymer (A1) and the vinyl monomer (A2). The graft copolymer (A) may or may not have a structural portion different from both the structural portion derived from the (meth)acrylic copolymer (A1) and the structural portion derived from the vinyl monomer (A2).

[0053] In 100% by weight of the graft copolymer (A), the sum of the content of the structural moiety derived from the (meth)acrylic copolymer (A1) and the content of the structural moiety derived from the vinyl monomer (A2) is preferably 75% by weight or more, more preferably 80% by weight or more, even more preferably 90% by weight or more, and most preferably 100% by weight. When the sum of the content of the structural moiety derived from the (meth)acrylic copolymer (A1) and the content of the structural moiety derived from the vinyl monomer (A2) is equal to or greater than the above lower limit, the effects of the present invention can be more effectively exhibited. In 100% by weight of the graft copolymer (A), the sum of the content of the structural moiety derived from the (meth)acrylic copolymer (A1) and the content of the structural moiety derived from the vinyl monomer (A2) may be 100% by weight or less, less than 100% by weight, 99% by weight or less, 95% by weight or less, or 90% by weight or less.

[0054] [Copolymer of acrylonitrile and butadiene (B)] The above-mentioned composition for rehabilitating pipes contains a copolymer (B) of acrylonitrile and butadiene (hereinafter, sometimes referred to as copolymer (B)). The above-mentioned copolymer (B) of acrylonitrile and butadiene is a non-crosslinked copolymer. The above-mentioned copolymer (B) is a reaction product of acrylonitrile and butadiene. The above-mentioned copolymer (B) has a structural portion derived from acrylonitrile and a structural portion derived from butadiene.

[0055] Because the rehabilitating pipe composition contains the copolymer (B), the storage modulus of the resulting rehabilitating pipe at around 80°C can be made relatively small. As a result, when the folded rehabilitating pipe is heated, the rehabilitating pipe can be smoothly restored to its original shape (tubular), improving the workability of the rehabilitating pipe. Furthermore, because the rehabilitating pipe composition contains the copolymer (B), the mechanical strength of the rehabilitating pipe can be increased.

[0056] The copolymer (B) is preferably prepared by crushing or pulverizing a bale- or sheet-shaped copolymer of acrylonitrile and butadiene. Examples of a pulverizer for crushing a bale- or sheet-shaped copolymer of acrylonitrile and butadiene include "U-480" manufactured by Horai Co., Ltd.

[0057] From the viewpoint of good mixing with the graft copolymer (A), the copolymer (B) is preferably in a particulate form. The copolymer (B) is preferably in the form of copolymer (B) particles (particles of the copolymer (B)). The specific shape of the particulate form may be pellet-like or flat.

[0058] The particle size of the particles of the acrylonitrile-butadiene copolymer (B) is preferably 5 mm or less, more preferably 3 mm or less, and even more preferably 1 mm or less. When the particle size of the particles of the copolymer (B) is not more than the above upper limit, the copolymer (B) can be well mixed with the graft copolymer (A). There is no particular limitation on the lower limit of the particle size of the particles of the copolymer (B). The particle size of the particles of the copolymer (B) may be 0.1 mm or more, or may be 0.3 mm or more.

[0059] The particle size of the particles of the copolymer (B) of acrylonitrile and butadiene is preferably an average particle size. The particle size of the particles of the copolymer (B) of acrylonitrile and butadiene can be measured, for example, using an image obtained by an electron microscope, and is determined as a particle size in terms of a circle equivalent diameter.

[0060] The content of the acrylonitrile and butadiene copolymer (B) is 3 to 20 parts by weight per 100 parts by weight of the graft copolymer (A) of the (meth)acrylic copolymer (A1) and the vinyl monomer (A2). The content of the copolymer (B) is preferably 3.5 parts by weight or more, more preferably 4 parts by weight or more, and preferably 15 parts by weight or less, more preferably 14 parts by weight or less per 100 parts by weight of the graft copolymer (A). When the content of the copolymer (B) is above the above lower limit and below the above upper limit, the effects of the present invention can be more effectively exhibited. The content of the acrylonitrile and butadiene copolymer (B) is preferably above the above lower limit and below the above upper limit per 100 parts by weight of the graft copolymer (A) of the (meth)acrylic copolymer (A1) and the vinyl monomer (A2).

[0061] [Anti-agglomerating agent (C)] The above-mentioned pipe rehabilitation composition contains an anti-agglomerating agent (C). Generally, non-crosslinked copolymers have high adhesive properties, so when the non-crosslinked copolymer is crushed or pulverized, the crushed or pulverized non-crosslinked copolymer may re-agglomerate and form a solid mass. The pipe rehabilitation composition of the present invention contains an anti-agglomerating agent (C), so even when the non-crosslinked copolymer is crushed or pulverized, the anti-agglomerating agent (C) coats the surface of the crushed or pulverized non-crosslinked copolymer, preventing the crushed or pulverized non-crosslinked copolymer from re-agglomerating, thereby enabling stable production of powder. That is, the pipe rehabilitation composition of the present invention can stably produce powder despite the inclusion of a non-crosslinked copolymer (copolymer (B) of acrylonitrile and butadiene).

[0062] Furthermore, in conventional pipe rehabilitation compositions, large amounts of anti-agglomerating agents containing calcium carbonate, calcium stearate, talc, and silica may be used.

[0063] As a result of extensive research, the present inventors have found that when a large amount of an anti-agglomeration agent having a Mohs hardness of 1 or more is used as an anti-agglomeration agent in a composition for rehabilitating pipes, the impact resistance (particularly impact resistance at low temperatures) of the resulting rehabilitated pipes decreases.

[0064] In the rehabilitating pipe composition of the present invention, the anti-agglomerating agent (C) does not contain metal or contains metal in an amount of 5% by weight or less, so that the impact resistance (particularly impact resistance at low temperatures) of the resulting rehabilitating pipe can be improved.

[0065] From the viewpoint of further improving the impact resistance (particularly impact resistance at low temperatures) of the resulting rehabilitated pipe, the deflocculating agent (C) preferably contains 5 wt% or less of substances having a Mohs hardness of 1 or more, based on 100 wt% of the deflocculating agent (C). From the viewpoint of further improving the impact resistance (particularly impact resistance at low temperatures) of the resulting rehabilitated pipe, the content of substances having a Mohs hardness of 1 or more, based on 100 wt% of the deflocculating agent (C), is preferably 4 wt% or less, more preferably 3 wt% or less, even more preferably 1 wt% or less, and most preferably 0 wt% (not contained). From the viewpoint of further improving the impact resistance (particularly impact resistance at low temperatures) of the resulting rehabilitated pipe, it is most preferable that the deflocculating agent (C) does not contain any substances having a Mohs hardness of 1 or more.

[0066] Examples of the substances having a Mohs hardness of 1 or more include calcium, magnesium, gold, silver, copper, platinum, palladium, zinc, lead, aluminum, cobalt, indium, nickel, chromium, titanium, antimony, bismuth, germanium, and cadmium, as well as alloys thereof.

[0067] From the viewpoint of further increasing the impact resistance (particularly the impact resistance at low temperatures) of the resulting rehabilitated pipe, it is particularly preferable that the anti-agglomerating agent (C) does not contain calcium.

[0068] Examples of the anti-agglomerating agent (C) include resins, powder coatings, etc. The anti-agglomerating agent (C) may be used alone or in combination of two or more.

[0069] Examples of the resin include polyvinyl chloride resin, polyolefin resin (polyethylene resin, etc.), and polyester resin.

[0070] From the viewpoint of further improving the impact resistance (particularly the impact resistance at low temperatures) of the resulting rehabilitated pipe, the anti-aggregating agent (C) preferably contains a resin, more preferably a vinyl chloride resin.

[0071] The vinyl chloride resin can be obtained by polymerizing a vinyl chloride monomer. The polymerization method for the vinyl chloride resin is not particularly limited. The vinyl chloride resin may be synthesized by suspension polymerization or emulsion polymerization. The vinyl chloride resin may be used alone or in combination of two or more.

[0072] The content of the anti-agglomerating agent (C) relative to 100 parts by weight of the graft copolymer (A) of the (meth)acrylic copolymer and vinyl monomer is preferably 0.5 parts by weight or more, more preferably 0.6 parts by weight or more, and preferably 15 parts by weight or less, more preferably 5 parts by weight or less. When the content of the anti-agglomerating agent (C) is equal to or more than the above lower limit and equal to or less than the above upper limit, the impact resistance (particularly impact resistance at low temperatures) of the obtained rehabilitating pipe can be further improved.

[0073] The content of the anti-agglomerating agent (C) relative to 100 parts by weight of the acrylonitrile-butadiene copolymer (B) is preferably 5 parts by weight or more, more preferably 10 parts by weight or more, and preferably 30 parts by weight or less, more preferably 20 parts by weight or less. When the content of the anti-agglomerating agent (C) is equal to or more than the above lower limit and equal to or less than the above upper limit, the impact resistance (particularly impact resistance at low temperatures) of the obtained rehabilitated pipe can be further improved.

[0074] [Impact modifier (D)] The above-mentioned rehabilitating pipe composition contains an impact modifier (D). Use of the impact modifier (D) can increase the mechanical strength of the resulting rehabilitating pipe.

[0075] Examples of the impact modifier (D) include methyl methacrylate (MMA)-based impact modifiers, methyl methacrylate-butadiene-styrene copolymer (MBS)-based impact modifiers, and chlorinated polyethylene (CPE)-based impact modifiers. The impact modifier (D) may be used alone or in combination of two or more.

[0076] The methyl methacrylate (MMA) impact resistance modifier can be obtained, for example, by graft copolymerizing a copolymer containing an acrylic acid ester with monomers such as methyl methacrylate, styrene, and acrylonitrile.

[0077] In the chlorinated polyethylene (CPE) impact modifier, the degree of chlorination of the chlorinated polyethylene is not particularly limited, and can be appropriately adjusted depending on the application of the resulting rehabilitating pipe.

[0078] From the viewpoint of improving the mechanical strength by thoroughly kneading the vinyl chloride resin, it is preferable that the impact modifier (D) contains a methyl methacrylate-butadiene-styrene copolymer (MBS)-based impact modifier.

[0079] The content of the impact modifier (D) is 3 parts by weight or more and 15 parts by weight or less per 100 parts by weight of the graft copolymer (A) of the (meth)acrylic copolymer and vinyl monomer. The content of the impact modifier (D) is preferably 5 parts by weight or more and preferably 10 parts by weight or less per 100 parts by weight of the graft copolymer (A). When the content of the impact modifier (D) is above the lower limit and below the upper limit, the mechanical strength of the obtained rehabilitating pipe can be further improved. The content of the impact modifier (D) is preferably above the lower limit and below the upper limit per 100 parts by weight of the graft copolymer (A) of the (meth)acrylic copolymer and vinyl monomer.

[0080] [Other ingredients] The above-mentioned rehabilitating pipe composition may contain other components in addition to the above-mentioned components (the above-mentioned graft copolymer (A), the above-mentioned copolymer (B), the above-mentioned anti-agglomerating agent (C), and the above-mentioned impact resistance modifier (D)). Examples of the above-mentioned other components include heat stabilizers, heat stabilization aids, lubricants, processing aids, heat resistance improvers, antioxidants, ultraviolet absorbers, antistatic agents, light stabilizers, pigments, flame retardants, and plasticizers. The above-mentioned other components may be used alone or in combination of two or more.

[0081] The heat stabilizer is not particularly limited. Examples of the heat stabilizer include a tin-based heat stabilizer, a lead-based heat stabilizer, a calcium-zinc-based heat stabilizer, a barium-zinc-based heat stabilizer, and a barium-cadmium-based heat stabilizer. The heat stabilizer may be used alone or in combination of two or more.

[0082] From the viewpoint of suppressing discoloration of the rehabilitating pipe and further increasing the mechanical strength of the rehabilitating pipe, the heat stabilizer is preferably a tin-based heat stabilizer, and more preferably an organotin-based heat stabilizer.

[0083] Examples of the organotin-based heat stabilizer include tin mercapto-based heat stabilizers, tin malate-based heat stabilizers, and tin carboxylate-based heat stabilizers. Examples of the tin mercapto-based heat stabilizers include monoalkyltin mercapto, dialkyltin mercapto, monoalkyltin mercapto polymer, dialkyltin mercapto polymer, monoalkyltin mercapto sulfide, and dialkyltin mercapto sulfide. Examples of the tin malate-based heat stabilizers include monoalkyltin maleates, dialkyltin maleates, monoalkyltin maleate polymers, and dialkyltin maleate polymers. Examples of the tin carboxylate-based heat stabilizers include monoalkyltin carboxylates and dialkyltin carboxylates. The organotin-based heat stabilizers may be used alone or in combination of two or more.

[0084] The content of the heat stabilizer relative to 100 parts by weight of the graft copolymer (A) is preferably 0.5 parts by weight or more, more preferably 1.0 part by weight or more, and preferably 5.0 parts by weight or less, more preferably 4.0 parts by weight or less. When the content of the heat stabilizer is equal to or more than the lower limit and equal to or less than the upper limit, the thermal stability can be further improved, and the heat resistance of the rehabilitating pipe can be further improved.

[0085] The heat stabilization aid is not particularly limited. Examples of the heat stabilization aid include epoxidized soybean oil, phosphate ester, polyol, hydrotalcite, and zeolite. The heat stabilization aid may be used alone or in combination of two or more.

[0086] The rehabilitating pipe composition preferably contains a lubricant. Examples of the lubricant include internal lubricants and external lubricants. The internal lubricant is used to reduce the flow viscosity of the molten resin during molding and prevent frictional heat generation. The internal lubricant is not particularly limited. Examples of the internal lubricant include butyl stearate, lauryl alcohol, stearyl alcohol, epoxy soybean oil, glycerin monostearate, stearic acid, and bisamide. The external lubricant is used to improve the sliding effect between the molten resin and the metal surface during molding. The external lubricant is not particularly limited. Examples of the external lubricant include polyethylene-based lubricants, ester-based lubricants, paraffin wax, polyolefin wax, and montanic acid wax. Only one type of the lubricant may be used, or two or more types may be used in combination.

[0087] From the viewpoint of improving the sliding property between the rehabilitating pipe composition and the metal surface (mold) during molding, the rehabilitating pipe composition preferably contains a polyethylene-based lubricant, and more preferably contains a polyethylene-based lubricant and an ester-based lubricant.

[0088] The content of the lubricant is preferably 0.1 part by weight or more, more preferably 1.0 part by weight or more, and preferably 8.0 parts by weight or less, more preferably 5.0 parts by weight or less, relative to 100 parts by weight of the graft copolymer (A). When the content of the lubricant is equal to or more than the lower limit and equal to or less than the upper limit, the sliding between the composition for rehabilitating pipe and the metal surface (mold) during molding can be improved, and the appearance of the obtained rehabilitating pipe can be improved.

[0089] The processing aid is not particularly limited. Examples of the processing aid include homopolymers or copolymers of (meth)acrylate monomers such as methyl (meth)acrylate, ethyl (meth)acrylate, and butyl (meth)acrylate; and copolymers of the above (meth)acrylate monomers with vinyl monomers such as styrene, vinyltoluene, and acrylonitrile. The processing aids may be used alone or in combination of two or more.

[0090] The content of the processing aid is preferably 0.1 part by weight or more, more preferably 1.0 part by weight or more, and preferably 8.0 parts by weight or less, more preferably 5.0 parts by weight or less, relative to 100 parts by weight of the graft copolymer (A). When the content of the processing aid is equal to or more than the above lower limit and equal to or less than the above upper limit, a glossy appearance can be obtained.

[0091] The heat resistance improver is not particularly limited. Examples of the heat resistance improver include α-methylstyrene-based resins and N-phenylmaleimide-based resins. The heat resistance improver may be used alone or in combination of two or more.

[0092] The antioxidant is not particularly limited. Examples of the antioxidant include phenol-based antioxidants. The antioxidants may be used alone or in combination of two or more.

[0093] The ultraviolet absorber is not particularly limited. Examples of the ultraviolet absorber include salicylic acid ester-based ultraviolet absorbers, benzophenone-based ultraviolet absorbers, benzotriazole-based ultraviolet absorbers, and cyanoacrylate-based ultraviolet absorbers. The ultraviolet absorbers may be used alone or in combination of two or more.

[0094] The light stabilizer is not particularly limited. Examples of the light stabilizer include hindered amine light stabilizers. The light stabilizers may be used alone or in combination of two or more.

[0095] The pigment is not particularly limited. Examples of the pigment include organic pigments and inorganic pigments. Examples of the organic pigment include azo-based organic pigments, phthalocyanine-based organic pigments, threne-based organic pigments, and dye lake-based organic pigments. Examples of the inorganic pigment include oxide-based inorganic pigments, molybdenum chromate-based inorganic pigments, sulfide-selenide-based inorganic pigments, and ferrocyanide-based inorganic pigments.

[0096] The content of the pigment is preferably 0.1 part by weight or more, more preferably 0.5 part by weight or more, and is preferably 8.0 parts by weight or less, more preferably 5.0 parts by weight or less, relative to 100 parts by weight of the graft copolymer (A). When the content of the pigment is equal to or more than the lower limit and equal to or less than the upper limit, sufficient weather resistance can be exhibited.

[0097] The plasticizer may be added to improve processability during molding. Since the addition of a plasticizer may reduce the heat resistance of the molded product, it is preferable to add a small amount of plasticizer. The plasticizer is not particularly limited. Examples of the plasticizer include dibutyl phthalate, di-2-ethylhexyl phthalate, and di-2-ethylhexyl adipate. Only one type of the plasticizer may be used, or two or more types may be used in combination.

[0098] (Rehabilitation pipe and manufacturing method of rehabilitation pipe) The rehabilitating pipe according to the present invention is a rehabilitating pipe molded from the above-mentioned pipe rehabilitating composition. The rehabilitating pipe can be obtained by molding the above-mentioned pipe rehabilitating composition. The rehabilitating pipe is a molded body of the above-mentioned pipe rehabilitating composition. The rehabilitating pipe may be a folded rehabilitating pipe or an unfolded rehabilitating pipe (a tubular rehabilitating pipe). The rehabilitating pipe is used by being installed inside an existing pipe. The rehabilitating pipe is suitably used for rehabilitating an existing pipe using the Omega Liner method.

[0099] The method for manufacturing a rehabilitating pipe according to the present invention includes a step of molding the above-described rehabilitating pipe composition.

[0100] The molding method of the rehabilitating pipe composition is not particularly limited. Examples of molding methods of the rehabilitating pipe composition include extrusion molding, injection molding, calendar molding, and press molding. From the viewpoint of improving dimensional stability in the longitudinal direction, the molding method of the rehabilitating pipe composition is preferably extrusion molding. From the viewpoint of further improving workability, the rehabilitating pipe is preferably an extrusion molded product of the rehabilitating pipe composition. From the viewpoint of improving productivity, the manufacturing method of the rehabilitating pipe preferably includes a step of molding the rehabilitating pipe composition by extrusion molding.

[0101] Examples of molding machines used for molding include a screw injection molding machine, a single-screw extruder, a twin-screw counter-rotating parallel extruder, a twin-screw counter-rotating conical extruder, and a twin-screw co-rotating extruder, etc. When molding using the above molding machines, the mold for shaping, the heating temperature, etc. are not particularly limited.

[0102] The thickness of the rehabilitating pipe is not particularly limited and may be 2 mm or more, 3 mm or more, 5 mm or more, 20 mm or less, or 10 mm or less.

[0103] The flexural modulus of the rehabilitating pipe at 25°C is preferably 1650 MPa or more, more preferably 1700 MPa or more, and even more preferably 1800 MPa or more. If the flexural modulus at 25°C is equal to or greater than the lower limit, the mechanical strength of the rehabilitating pipe can be further increased. There are no particular restrictions on the upper limit of the flexural modulus of the rehabilitating pipe at 25°C. The flexural modulus of the rehabilitating pipe at 25°C may be 3600 MPa or less, or may be 3200 MPa or less.

[0104] The flexural modulus of the rehabilitating pipe at 25° C. can be measured in accordance with the “Bending test method for hard plastics” described in JIS K:7203.

[0105] The storage modulus of the rehabilitating pipe at 80°C is preferably 5 MPa or more, more preferably 10 MPa or more, even more preferably 15 MPa or more, and is preferably 250 MPa or less, more preferably 120 MPa or less, even more preferably 100 MPa or less. When the storage modulus at 80°C is equal to or greater than the lower limit, the rehabilitating pipe can be deformed well by heat, thereby improving the workability of the rehabilitating pipe.

[0106] The storage modulus of the rehabilitated pipe at 80°C can be measured, for example, as follows. The rehabilitated pipe is cut out to obtain a test piece measuring 5 mm wide x 35 mm long x 2 mm thick. If the thickness of the rehabilitated pipe is less than 2 mm, multiple samples may be stacked and pressed using a heat press molding machine (e.g., manufactured by Kodaira Manufacturing Co., Ltd.) heated to 190°C to obtain a test piece measuring 5 mm wide x 35 mm long x 2 mm thick. The storage modulus of the obtained test piece is measured using a dynamic viscoelasticity measuring tester (e.g., "DVA200" manufactured by IT Instrument & Control Co., Ltd.) under conditions of heating from 25°C to 100°C at a heating rate of 3°C / min.

[0107] (Method of rehabilitating existing pipes) The above-mentioned rehabilitation pipe can be used to rehabilitate an existing pipe. The method for rehabilitating an existing pipe is preferably a method for rehabilitating an existing pipe using the Omega Liner method. The method for rehabilitating an existing pipe preferably includes the steps of (1) placing the folded rehabilitation pipe inside the existing pipe, (2) heating the rehabilitation pipe with steam, and (3) using compressed air to tightly contact the outer peripheral surface of the rehabilitation pipe with the inner peripheral surface of the existing pipe.

[0108] The method for rehabilitating an existing pipe will be described below with reference to the drawings.

[0109] 1(a) to 1(c) are cross-sectional views for explaining each step of the method for rehabilitating an existing pipe. Fig. 1 is an explanatory diagram for rehabilitating an existing pipe by the Omega Liner method.

[0110] First, the folded rehabilitating pipe 1 is pulled into the existing pipe 20, and the folded rehabilitating pipe 1 is placed inside the existing pipe 20 (Fig. 1(a)). Next, steam is passed through the rehabilitating pipe 1 from a boiler unit vehicle or the like to heat the rehabilitating pipe 1 (Fig. 1(b)). The heating by the steam causes the rehabilitating pipe 1 to gradually return to its tubular shape. Next, compressed air is passed through the rehabilitating pipe 1 to expand its diameter, and the outer surface of the rehabilitating pipe 1 is brought into tight contact with the inner surface of the existing pipe 20 (Fig. 1(c)).

[0111] The present invention will be described in more detail below with reference to examples, but the present invention is not limited to the following examples.

[0112] The following materials were prepared:

[0113] Graft copolymer (A) of (meth)acrylic copolymer and vinyl monomer: Tokuyama Sekisui Kogyo Co., Ltd. "AG64T" (including coagulation inhibitor)

[0114] Polyvinyl chloride resin: Tokuyama Sekisui Kogyo "TS1000R"

[0115] Copolymer of acrylonitrile and butadiene (B) (non-crosslinked copolymer): "N220SH" manufactured by ENEOS Materials (non-crosslinked copolymer, crushed into particles (particle diameter 3mm to 5mm) using a Horai crusher (U-480)) ENEOS Materials "PN20HA" (non-crosslinked copolymer, particle size 0.1mm-1mm) "N230SH" manufactured by ENEOS Materials (non-crosslinked copolymer, crushed into particles (particle diameter 3mm to 5mm) using a Horai crusher (U-480))

[0116] Other acrylonitrile and butadiene copolymers (crosslinked copolymers): ARLANXEO "Baymod (registered trademark) N XL 33.61" (cross-linked resin, particle size 0.1 mm to 1 mm)

[0117] Anti-agglomerating agent (C): "AG64T" manufactured by Tokuyama Sekisui Co., Ltd. (a graft copolymer of a (meth)acrylic copolymer and a vinyl monomer) (including a graft copolymer (A) of a (meth)acrylic copolymer and a vinyl monomer) Polyvinyl chloride resin calcium carbonate

[0118] Impact modifier (D): Kaneka Corporation's "Kane Ace B564" (MBS-based impact modifier)

[0119] Heat stabilizer: Organotin heat stabilizer

[0120] Other Ingredients: Lubricant Processing aids pigment

[0121] (Examples 1 to 5 and Comparative Examples 1 to 4) The components shown in Tables 1 and 2 were blended in the amounts shown in Tables 1 and 2 to obtain a rehabilitating pipe composition. The obtained rehabilitating pipe composition was fed into a 50 mm diameter twin-screw counter-rotating extruder ("SLM-50" manufactured by Nagata Manufacturing Co., Ltd.), melt-kneaded, and then molded in a mold with an outer diameter of 20 mm. In this way, a rehabilitating pipe with an outer diameter of 20 mm and a thickness of 3 mm was obtained.

[0122] (evaluation) (1) Storage modulus at 80°C The rehabilitated pipe was cut out to obtain test pieces measuring 5 mm wide x 35 mm long x 2 mm thick. The storage modulus of the test pieces was measured using a dynamic viscoelasticity measuring machine (IT Instrument & Control Co., Ltd., "DVA200") while heating from 25°C to 100°C at a rate of 3°C / min.

[0123] (2) Workability of the rehabilitated pipe (shape restoration ability) The obtained rehabilitated pipe was left to stand in a Geer oven at 80°C for 20 minutes, and then folded into a quarter-fold shape (omega shape). The folded rehabilitated pipe was cooled until its temperature reached 25°C. 30 minutes after the temperature of the rehabilitated pipe reached 25°C, the rehabilitated pipe was visually inspected. Shape recovery was evaluated according to the following criteria.

[0124] [Criteria for determining shape restoration] ○: The rehabilitated pipe has been restored to its tubular shape ×: A recess exists on the outer periphery of the rehabilitated pipe, and the rehabilitated pipe has not been restored to its tubular shape.

[0125] (3) Mechanical strength of rehabilitated pipe The flexural modulus of the obtained rehabilitated pipe at 25°C was measured in accordance with the "Bending test method for rigid plastics" described in JIS K7203. The mechanical strength of the rehabilitated pipe was evaluated according to the following criteria.

[0126] [Criteria for determining the mechanical strength of rehabilitated pipes] ○: Flexural modulus at 25℃ is 1650MPa or more ×: Flexural modulus at 25°C is less than 1650 MPa

[0127] (4) Impact resistance of rehabilitated pipes at low temperatures Using the obtained rehabilitated pipe, notched test pieces were prepared in accordance with the "Charpy impact test method for rigid plastics" described in JIS K7111, and the Charpy impact values ​​were measured. The measurements were carried out in an atmosphere of 0°C. The impact resistance of the rehabilitated pipe at low temperatures was evaluated according to the following criteria.

[0128] [Criteria for determining the impact resistance of rehabilitated pipes at low temperatures] ○: No cracks occur ×: Cracks occur

[0129] Details and results are shown in Tables 1 and 2.

[0130] [Table 1]

[0131] [Table 2]

[0132] In addition, for "AG64T" manufactured by Tokuyama Sekisui Kogyo Co., Ltd. used in Examples 1 to 5 and Comparative Examples 1 to 3, the content of the (meth)acrylic copolymer (A1) was 1% by weight or more and 30% by weight or less in 100% by weight of the graft copolymer (A) of the (meth)acrylic copolymer (A1) and the vinyl monomer (A2). [Explanation of symbols]

[0133] 1…Rehabilitation pipe 20...Existing pipe

Claims

1. a graft copolymer of a (meth)acrylic copolymer and a vinyl monomer; a copolymer of acrylonitrile and butadiene; an anti-agglomerating agent; and an impact modifier, the copolymer of acrylonitrile and butadiene is a non-crosslinked copolymer, the anti-agglomerating agent is metal-free or contains 5% by weight or less of a metal; the content of the acrylonitrile and butadiene copolymer is 3 parts by weight or more and 20 parts by weight or less relative to 100 parts by weight of the graft copolymer of the (meth)acrylic copolymer and a vinyl monomer, A composition for rehabilitating pipes, wherein the content of the impact resistance modifier is 3 parts by weight or more and 15 parts by weight or less per 100 parts by weight of the graft copolymer of the (meth)acrylic copolymer and a vinyl monomer.

2. 2. The composition for rehabilitating pipes according to claim 1, wherein the particle diameter of the particles of the copolymer of acrylonitrile and butadiene is 5 mm or less.

3. The composition for rehabilitating pipes according to claim 1 or 2, wherein the content of the (meth)acrylic copolymer is 1% by weight or more and 30% by weight or less in 100% by weight of the material of the graft copolymer of the (meth)acrylic copolymer and the vinyl monomer.

4. a (meth)acrylic copolymer material in the graft copolymer of the (meth)acrylic copolymer and a vinyl monomer contains a (meth)acrylate having an alkyl group; 3. The composition for pipe rehabilitation according to claim 1, wherein the glass transition temperature of the homopolymer of the alkyl group-containing (meth)acrylate is −140° C. or higher and −20° C. or lower.

5. A rehabilitating pipe formed from the composition for rehabilitating pipes according to claim 1 or 2.

6. A method for manufacturing a rehabilitating pipe, comprising a step of molding the rehabilitating pipe composition according to claim 1 or 2.

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