JPH10281392A - Work execution method for heat insulating material for piping - Google Patents

Abstract

PROBLEM TO BE SOLVED: To finish a bonding operation in a short time, by bonding seams of heat insulating materials which coats a piping to keep the piping warm or cool using α-cyanoacrylate based adhesive. SOLUTION: When a variety of pipings coated with piping heat insulating and keeping cool material is bonded, first, a notch is formed on the heat insulating and keeping cool material which coats the piping to expose the piping, and in this situation, the pipings are attached and brazed each other. Then, the α-cyanoacrylate based adhesive is coated on a cross section of the notch on the piping heat insulating and keeping cool material, and the cross section is put on the piping to bond them. By winding an adhesive tape around the bonded part of the piping, the open air hardly comes into contact with the piping. The preferable viscosity of the α-cyanoacrylate based adhesive is 100-1 million mPa-s. During bonding, it is preferable to use a primer for the α- cyanoacrylate based adhesive also.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is also referred to as a heat insulating material or a cold insulating material depending on the use of an air conditioner pipe, a hot water supply pipe, a steam pipe, a water pipe, a drain pipe, a water supply pipe, a buried pipe, etc. The present invention relates to a method of coating insulation on the surface of a pipe with heat insulating material, and a workable heat insulating material in which a joint portion of the heat insulating material (hereinafter also referred to as a joint portion of the heat insulating material) does not peel after the heat insulating material is applied. Construction method,
It belongs to technology related to civil engineering and construction.

[0002]

2. Description of the Related Art Air-conditioner pipes, hot water supply pipes, water pipes, drain pipes, water supply pipes, buried pipes, and the like have been considered not only for the purpose of keeping heat and cooling, but also for preventing condensation and freezing. In recent years, coating with a heat insulating material such as a heat insulating material or a cold insulating material has become very popular in recent years.

[0003] Heat insulating materials and cooling materials for pipes (hereinafter referred to as pipe heat insulating and cooling materials) are used for covering the pipe main body to keep the medium in the pipe warm or cool. An example is shown in FIG. In FIG. 1, the heat insulating material, the cold insulating material, etc. applied to the pipe are constituted by a skin layer and a heat insulating layer.
Some are composed of a single layer, and the material is polyethylene
It covers a wide variety of areas, including expanded polyethylene, cross-linked expanded polyethylene, cross-linked expanded polypropylene, cross-linked polyethylene foam, urethane foam, isocyanurate foam, and EPDM.

[0004] The connection of various pipes covered with such a pipe heat insulating material is performed on site, and when the pipe heat insulating material is relatively thin and easily bent, the pipe heat insulating material shown in FIG. If the pipe insulation material is thick and difficult to bend, cut and remove the pipe insulation material as shown in Fig. 3 to expose the steel pipes, braze the steel pipes together, and then heat the pipes to the steel pipes. The fact is that it is done by covering with a cold insulator and wrapping an adhesive tape.

In the connection method using an adhesive tape, it is necessary to wrap the adhesive tape in multiple layers to obtain a sufficient seal, and when the piping is in the immediate vicinity of the wall or when the space between the piping is narrow, the adhesive tape is not used. Since the tape roll cannot pass between the pipe and the wall or between the pipe and the pipe, it becomes impossible to wrap the adhesive tape around the pipe itself, and once the commercial adhesive tape is wound on a thin stick such as a pencil as needed. Therefore, it has been practiced to make a roll of an appropriate size and then wind it, but it is not very labor-intensive and can not be said to have good work efficiency. Despite this inconvenient connection method, there is no other connection method that can universally support piping and heat insulating materials of various materials as described above, so connection methods using adhesive tape are widely used. Have been.

Further, when the tape is fixed with an adhesive tape, the tape itself is not durable, so that the tape is peeled off, and the exposed portion is directly exposed to the outside air. Have.

In view of such a situation, Japanese Patent Application Laid-Open No. 2-304
The method disclosed in Japanese Unexamined Patent Publication No. 8-35686 discloses a method of foam-filling and connecting a joint of a pipe heat insulating and cooling material with a two-component mixed type silicone-based flame-retardant foaming agent using a cylindrical jig as disclosed in JP-A-8-35686. Although a cover for protecting an air conditioner pipe has been studied and known, it takes time for connection and is not necessarily a method in consideration of a layout around a site.

[0008]

DISCLOSURE OF THE INVENTION The present invention overcomes the drawbacks of the conventional method of connecting a pipe heat insulating and cooling material, eliminates the possibility of exposing joints, and provides a layout around a site and a pipe heat insulating material. It is an object of the present invention to provide a connection method that can easily complete a connection operation in a short time regardless of the type of material of the connection member, and that is excellent in durability of a joint portion.

[0009]

Means for Solving the Problems The inventors of the present invention have made intensive studies to solve the above-mentioned problems, and as a result, have found that the connecting portions of the pipe heat insulating material are bonded using an α-cyanoacrylate adhesive. As a result, a method for completing the connection work in a short time was found, and the present invention was completed.

[0010] That is, the present invention relates to a method for applying a heat insulating material for a pipe, characterized in that a seam of the heat insulating material coated on the pipe is bonded with an α-cyanoacrylate-based adhesive in order to keep the temperature or cool the pipe. 100mP viscosity at the joint of the heat insulating material coated on the pipes to keep things and pipes warm or cool
a.s or more α-cyanoacrylate-based adhesives, the method relating to a method of applying a heat-insulating material for piping characterized by further comprising α-cyanoacrylate-based adhesive The present invention relates to a method for installing a heat insulating material for piping, which comprises using a primer for an agent.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A method for applying a heat insulating material for piping using an α-cyanoacrylate adhesive of the present invention will be described below with reference to the drawings.

[0012] The pipe heat insulating material to which the present invention can be applied is used as a pipe heat insulating material for pipes such as air conditioner pipes, hot water supply pipes, steam pipes, water pipes, drain pipes, water supply pipes, and buried pipes. And is usually used by covering a pipe main body such as a copper pipe.

FIG. 1 shows an example of a pipe heat insulating material to which the present invention can be applied. In FIG. 1, the pipe heat insulating material is composed of a skin layer and a heat insulating layer, but there are also a heat insulating layer composed of a single layer of only a heat insulating layer, a heat insulating layer composed of multiple layers, and a pipe heat insulating material, and the material is polyethylene. Foamed polyethylene, crosslinked foamed polyethylene, crosslinked foamed polypropylene, crosslinked polyethylene foam, urethane foam, isocyanurate foam, EPDM, etc.

Next, an example of the construction method of the present invention will be described.
First, a cut is made in the heat insulation material covering the pipe to expose the pipe body (FIG. 2). Next, the pipe body is attached and brazed (FIG. 4). Then, an α-cyanoacrylate-based adhesive is applied to the cross section of the cut of the pipe heat insulating material, and is adhered to the pipe body at the same time as covering (FIG. 5). Wrapping the bonded portion with an adhesive tape or the like is a preferable method because the outside air is more difficult to contact the pipe main body, and is also used in the present invention.

When the α-cyanoacrylate adhesive is applied, the adhesive may be applied after applying the adhesive to the cut section of the pipe heat insulating material, or the α-cyanoacrylate adhesive may be applied after the cut section is attached. May be permeated and adhered. Penetration bonding is preferably applied when the clearance is not so large, because if the clearance between the attached pipe heat insulating materials is large, the α-cyanoacrylate adhesive may require time to cure.

The main component of the α-cyanoacrylate-based adhesive is 2-cyanoacrylate, and in the present invention, similarly to the conventionally known adhesives, those containing various 2-cyanoacrylate as a main component are used. The 2-cyanoacrylic acid methyl, ethyl, chloroethyl, n-propyl, i-propyl, allyl, propargyl, n-butyl, i-butyl
n-pentyl, n-hexyl, cyclohexyl, phenyl,
Tetrahydrofurfuryl, heptyl, 2-ethylhexyl, n-octyl, n-nonyl, oxononyl, n-decyl, n-
Esters such as dodecyl, 2-ethoxyethyl, 3-methoxybutyl, 2-ethoxy-2-ethoxyethyl, butoxy-ethoxy-ethyl, 2,2,2-trifluoroethyl and hexafluoroisopropyl are used for the adhesive in the present invention. Although used as a main component, the α-cyanoacrylate adhesive of the present invention is not limited to those containing these as main components.

The preferred viscosity of the α-cyanoacrylate adhesive composition in the present invention is from 1 to 1,000,000 mPa · s.
, And the more preferable viscosity is 500 to 300,000 mPa · s. If the viscosity is less than 100 mPa · s, the adhesive applied to the cross section of the heat insulating and cooling material of the pipe will hang down, causing poor adhesion or significantly impairing the appearance around the joint. On the other hand, if it exceeds 1,000,000 mPa · s, the application itself becomes difficult.

As the α-cyanoacrylate adhesive used in the present invention, those using a conventionally known thickener for applying the above viscosity are applied. Examples of the thickener include methyl methacrylate polymer and methyl methacrylate. / Acrylate copolymers / acrylonitrile / styrene copolymers / polyvinyl acetate / cyanoacrylate polymers / cellulose esters / polyalkyl vinyl ethers / hydrophobic silicas, but those using other thickeners can also be used in the present invention. Can be.

The α-cyanoacrylate-based adhesive in the present invention may be one to which additives used in known adhesives have been added. Examples of such additives include anionic polymerization inhibitors and radicals Polymerization inhibitor
Examples include a curing accelerator, a plasticizer, a dye, a fragrance, and the like.

In the present invention, when bonding with an α-cyanoacrylate adhesive, it is preferable to further use a primer for the α-cyanoacrylate adhesive. This not only enables stronger adhesion regardless of a wide variety of materials such as polyethylene, expanded polyethylene, cross-linked expanded polyethylene, cross-linked expanded polypropylene, cross-linked polyethylene foam, urethane foam, isocyanurate foam, and EPDM, but also requires additional work. It is possible to shorten the time, and the work efficiency can be further improved.

The primer for α-cyanoacrylate-based adhesive is used to shorten the set time of the material to be adhered, which requires an extremely long set time when used alone, or when used alone. It is used for good adhesion of adherent materials with low adhesive strength even if it is not bonded or adhered, contains basic substances as an essential component, and is usually used after being dissolved in an organic solvent or water. is there.

As the primer for the α-cyanoacrylate adhesive, conventionally known primers can be used, and preferable examples thereof include triethylamine, triethanolamine, diethylenetriamine, N, N, N, N-tetramethylhexamethylenediamine and the like. Aliphatic amine primer containing as an ingredient, aromatic containing N, N-dimethyl-p-toluidine, o-phenylenediamine, lutidine, 1,2,3,4-tetrahydroquinoline, nicotinamide, etc. as an active ingredient Contains amine-based primers, N, N-dimethylcyclohexyldiamine, 1,5-diazabicyclo (4,3,0) nonene-5,2-ethyl-4-methylimidazole, N, N-didicyclohexylcarbodiimide, etc. as active ingredients Alicyclic compound based primer, phosphonium containing tetramethylphosphonium chloride etc. as an active ingredient Primers, ammonium salt primers containing benzyltrimethylammonium chloride and the like as active ingredients, phosphite ester primers containing trisisodecyl phosphite and the like as active ingredients, bis (2,4-di-tert-butylphenyl) -Pentaerythritol diphosphite 4,4'-
Phosphite-based primers containing butylidene-bis (3-methyl-tert-butylphenylditridecyl) phosphite as an active ingredient, phosphine-based primers containing diphenylphosphine, tolylphosphine, bisdiphenylphosphinoethane, etc. as an active ingredient A primer, an organic silane-based primer containing octadecyldimethyl- [3- (trimethoxysilyl) propyl] ammonium chloride or the like as an active ingredient, an alkali-inorganic salt-based primer containing sodium hydroxide or potassium hydroxide as an active ingredient, Organometallic compound primers containing zinc acetylacetone, nickel naphthenate, zinc tartrate, dioctyltin laurate, tetrabutyl titanate, etc. as active ingredients, zinc 2-ethylhexanedithioate, mercaptobenzothiazole, 4-methyl Sulfur compound-based primers containing, as an active ingredient, such as containing captopyridine, 2-mercaptopyridine-N-oxide, etc. as an active ingredient, among which more preferred are amine-based primers, particularly preferred Examples thereof include aromatic amine primers containing N, N-dimethyl-p-toluidine, o-phenylenediamine, lutidine, 1,2,3,4-tetrahydroquinoline, nicotinamide as an active ingredient. However, the present invention is not limited to these.

The primer is used in such a manner that one of the cut sections of the pipe heat insulating material is applied to one side and an α-cyanoacrylate adhesive is applied to the other, and when the pipe body is covered with the pipe insulating material, Method of bonding cross sections, α-
A method of applying a cyanoacrylate-based adhesive, butting both cross sections, and then spraying the joint to a pipe heat insulating material is exemplified.

[0024]

EXAMPLES The present invention will be described in more detail with reference to the following Examples and Comparative Examples, but the present invention is not limited to these Examples.

Example 1 A commercially available pipe with a heat insulating material (IPO tube A type: manufactured by INNOAC CORPORATION) having a skin layer made of polyethylene resin, a heat insulating layer made of high-expanded polyethylene, and a pipe body made of copper pipe was used for a 60-cm pipe. Cut to length. The heat insulating material of this pipe was cut in the circumferential direction near the center of the pipe with a cutter, and further cut in parallel with the pipe to produce a pipe test piece as shown in the upper diagram of FIG.
A commercially available primer for α-cyanoacrylate adhesive (aa setter: manufactured by Toa Gosei Co., Ltd.) is sprayed on one section of the pipe heat insulating material, and a commercially available viscosity of 1,000 mPa is applied to the other section of the pipe insulating material. S α-cyanoacrylate adhesive (Aron Alpha # 203: manufactured by Toagosei Co., Ltd.) was applied. After the elapse of 5 minutes, the pipe heat insulating material was put on the pipe body, and the pipe heat insulating material was stuck together. After 5 seconds from the lamination, the film was peeled off and found to be adhered. In this plumbing test piece,
A durability test was performed using a UVCON tester (manufactured by Toyo Seiki Seisaku-sho, Ltd.). One cycle of the durability test is 6
After irradiating with ultraviolet rays for 4 hours while heating to 0 ° C.,
The condition was that the relative humidity was maintained at 95% for 4 hours while heating. After 250 cycles, the sample was taken out of the UVCON tester, and the adhesion was examined. As a result, no abnormalities such as peeling and deformation were observed, and the sealing property was good.

Comparative Example 1 Using the same pipe test piece as in Example 1, the pipe insulation and cooling material was fixed with a commercially available cloth adhesive tape, and the same durability test as in Example 1 was performed. UVC after 250 cycles
After taking it out of the ON tester and examining the bonding points,
The cloth adhesive tape was peeled off, and the steel pipe body was exposed.

Comparative Example 2 Using the same pipe test piece as in Example 1, the pipe insulation and cooling material was fixed with a commercially available vinyl tape.
The same durability test as described above was performed. UV after 250 cycles
The vinyl tape was peeled off and the steel pipe main body was exposed when the sample was taken out of the CON tester and the adhesion was examined.

COMPARATIVE EXAMPLE 3 Using the same pipe test piece as in Example 1, a commercially available rubber-based adhesive was used to fix the pipe heat insulating and cooling material. It was not cured within 1 hour, and was pulled off lightly to confirm that it had been fixed after 24 hours had passed. Therefore, the durability test was not performed.

COMPARATIVE EXAMPLE 4 Using a pipe test piece and the same evaluation method as in Example 1, fixing of a pipe heat insulating material was attempted using a commercially available two-liquid mixed room temperature curing type epoxy adhesive. It did not cure within 1 hour, and after 24 hours, it was pulled lightly to confirm that it was fixed after 24 hours, so that it did not undergo a durability test.

As is clear from the results of the durability test described above, the sealability of the joint between the pipe heat insulating and cooling material was evaluated.
Compared to the connection method using the adhesive tape of the comparative example, the working method of the present invention is not only short in working time, but also shows that the sealing property is maintained over a long period of time, and the pipe insulation evaluated by the bonding time is also shown. It was shown that the working time of the cold insulator was completed in a much shorter time in the construction method of the present invention than in the construction method using an adhesive other than the adhesive used in the present invention.

[0031]

As described above, the present invention is a method for installing a heat insulating material for a pipe, which can connect and fix a pipe heat insulating material without worrying about exposure of a connecting portion and can complete the work in a short time. Furthermore, by applying a primer of α-cyanoacrylate adhesive to the cross section of the pipe heat insulation material, the fixing time can be shortened easily regardless of the material of the pipe insulation material, and even workers with little experience can easily work. Therefore, there are immeasurable benefits obtained by using this construction method.

[Brief description of the drawings]

FIG. 1 is a view showing a state of a pipe heat insulating material provided on a pipe.

FIG. 2 is a view showing a state in which a cut is made in a pipe heat insulating material covering the pipe to expose a pipe main body.

FIG. 3 is a view showing a state in which a steel pipe is exposed by cutting and removing a pipe heat insulating material when the pipe heat insulating material is thick and difficult to bend.

FIG. 4 is a view showing a state where an exposed pipe main body is attached and brazed.

FIG. 5 is a view showing a state in which an α-cyanoacrylate adhesive is applied to a cut section of the pipe heat insulating material, covered with the pipe main body, and simultaneously bonded.

FIG. 6 is a diagram showing a procedure for producing a pipe test piece from a pipe with a heat insulating material.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pipe main body 2 Pipe heat insulation material 3 Skin layer 4 Heat insulation layer

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Seitaro Tajima 1 in Funami-cho, Minato-ku, Nagoya-shi, Aichi Prefecture Inside Nagoya Research Institute, Toagosei Co., Ltd. (72) Inventor Miyoshi Sato Funami-cho, Minato-ku, Nagoya-shi, Aichi Nagoya Research Institute, Toagosei Co., Ltd. (72) Inventor Shuta Nakagawa 1 Togosei Gosei Co., Ltd., Nagoya Research Institute, Minato-ku, Nagoya, Aichi

Claims (3)

[Claims] 1. A method for constructing a heat insulating material for a pipe, comprising bonding a seam of the heat insulating material coated on the pipe with an α-cyanoacrylate-based adhesive to keep the temperature or cool the pipe. 2. The method according to claim 1, wherein the α-cyanoacrylate adhesive used has a viscosity of 100 mPa · s or more. 3. The method according to claim 1, wherein a primer for an α-cyanoacrylate adhesive is used in combination.
Construction method of the insulation material for piping described.