JPH112385A - Sound proofing, anticorrosive, and antisweating structure for gas piping - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively perform sound proofing, antisweating, and anticorrosive processes for gas piping, by providing at least an adhesion water-barrier sheet layer which contains at least one of rust preventives and sound proofing agent and tightly sticks to a gas pipe, and a sound absorbing foaming products layer which is placed around the sheet layer and covers the gas pipe, and, if necessary, a water-proof protection tape layer around the sound absorbing foaming products layer. SOLUTION: The structure consists of at least an adhesion water-barrier sheet layer 2 which tightly sticks to a gas pipe, and a sound absorbing foaming products layer 3 which is placed around the sheet layer and covers the gas pipe 1. The adhesion waterbarrier sheet layer 2 contains at least one of rust preventives and sound proofing agent, and can be made as anticorrosive type, sound proofing type, or anticorrosive and sound proofing type by adjusting mixed components. The sound absorbing foaming layer 3 is composed of foaming products, assembly of foaming tips, and others. In addition, in order to protect and water-proof the adhesion water-barrier sheet layer 2 and the sound absorbing foaming products layer 3, if necessary, a water-proof protection tape layer 4 is provided around them.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention can be constructed by simple operations such as a winding method, a sticking method, a mounting method and a coating method.
The present invention relates to a structure capable of performing both soundproofing, corrosion prevention and dew-proofing of a gas pipe in a gas pressure regulating station or the like.

[0002]

2. Description of the Related Art Supply of gas from a production site to a consumption site is as follows.
It is carried out through a piping system that has a gas pressure regulator (governor station) for adjusting the supply flow rate of supply gas in the middle of piping composed of iron pipes, etc. Injection noise generated when passing through a governor installed in the house becomes a noise source, which is a problem in the neighborhood living environment and work environment.

Conventionally, as a soundproof structure such as a water pipe, there is known a structure in which a sound insulating sheet is wound (Japanese Patent Laid-Open No. 63-2).
No. 34298, JP-A-4-11130), the gas adiabatically expands at the time of the above-mentioned gas injection in the gas pipe, and condensate easily forms around the pipe due to its cooling effect. In this case, there is a problem that dewed water drops enter the inside and the pipe is easily rusted, and the sound absorbing performance is reduced due to the water absorption of the sound absorbing material.

[0004] For this reason, the soundproofing of gas pipes in governors and the like is performed by coating the gas pipes with anticorrosion coating with rock wool or zinc iron plate. However, at present, the soundproofing and anticorrosion effects are poor and the effects as expected are not obtained.In addition, there are problems that the soundproofing and anticorrosion treatment requires many hours and labor and the workability is poor. Was.

[0005]

The present invention can efficiently perform soundproofing treatment, dew condensation prevention (dewproofing) treatment and anticorrosion treatment of gas pipes, and can also be applied to irregularly shaped parts such as elbows, valves and flanges of pipes. Another object of the present invention is to develop a structure that can be easily constructed and has excellent workability, and that maintains the above-described soundproofing, dewproofing, and anticorrosion treatment effects for a long period of time.

[0006]

An object of the present invention is to provide a pressure-sensitive adhesive water-insulating sheet layer which contains at least one of a rust inhibitor and a sound insulating material and is in close contact with a gas pipe, and a sound-absorbing foamed molded article which is disposed outside and covers the gas pipe. The present invention provides a soundproofing, corrosionproofing and dewproofing structure for gas piping, characterized by having at least a layer and a waterproofing protective tape layer as required outside the sound-absorbing foamed molded article layer.

[0007]

According to the present invention, an excellent anticorrosion effect can be achieved by tightly covering the outer periphery of a gas pipe with an adhesive water-impervious sheet layer, and the gas can be removed by a simple operation such as a sheet winding method or a sticking method. It can be easily adhered to irregularly shaped parts such as elbows, valves, flanges, etc., of pipes, which have irregularities and irregular diameters, and is excellent in workability and workability. In some cases, the anticorrosion effect can be maintained for a long period of time without peeling or breakage by closely following the expansion and contraction of the steel sheet, and the soundproofing effect can be exhibited.

On the other hand, the sound-absorbing molded foam layer located outside the pressure-sensitive adhesive and water-shielding sheet layer exerts a stable sound-proofing effect and a dew-proofing effect by a sound-absorbing effect and a heat-insulating effect by the foamed structure, and the effects are maintained for a long time. continue. Therefore, the dew prevention effect contributes to the anticorrosion function, and the more stable anticorrosion effect is maintained for a long time. Also, the sound-absorbing foamed molded layer can be easily applied to the irregular shape of the gas pipe by a simple work such as a winding method or a mounting method as a sheet or a molded body formed in advance in a covering form, and is excellent in workability or workability. ing.

Therefore, according to the present invention, it is possible to efficiently perform a soundproofing process, a dewproofing process, and a corrosionproofing process on a gas pipe including a deformed portion by a simple work excellent in workability such as a winding system and a mounting system. The soundproofing, dewproofing and anticorrosion treatment effects last for a long time.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION The soundproofing, corrosionproofing and dewproofing structure of the present invention is intended to be applied to gas pipes, and contains at least one of a rustproofing agent and a soundproofing material and is in close contact with the gas pipe. And a structure having at least a sound-absorbing molded foam layer disposed outside thereof and covering the gas pipe. An example is shown in FIG. 1 is a gas pipe, 2 is an adhesive waterproof sheet layer,
Reference numeral 3 denotes a sound-absorbing foamed molded product layer; 21 denotes a non-adhesive skin layer;
1 is a protective film layer, 4 is a waterproof protective tape layer, and 5 is a top coat layer.

In the present invention, the adhesive water-shielding sheet layer is formed of an adhesive water-shielding sheet that contains at least one of a rust inhibitor and a sound insulating material and can be adhered to a gas pipe by a winding method or a sticking method. The water-shielding sheet can be formed as a corrosion-proof type or a sound-proof type, or a corrosion-proof and sound-proof type by adjusting the compounding components comprising a rust preventive, a sound insulating material, and the like.

That is, the pressure-sensitive adhesive water-shielding sheet comprises a pressure-sensitive adhesive type base or a grease type base made of a polymer, a tackifier, or the like, a rust inhibitor and / or a sound insulating material, and a plasticizer or an antiaging agent as required. And a compound in which an appropriate additive such as a fungicide, an antioxidant, a pigment, a filler, a thickening agent such as a thixotropic agent, etc. is compounded and formed into a sheet form. Accordingly, by controlling the compounding composition of the rust inhibitor or the sound insulating material in the compound, an anticorrosive type or a soundproof type, or an anticorrosive and soundproof type adhesive water-shielding sheet can be formed.

As the above-mentioned pressure-sensitive adhesive type base, for example, a pressure-sensitive adhesive of rubber type, acrylic type, vinylalkyl ether type or silicone type may be used, which may be a known polymer or a tackifier. There is no limitation.
In general, a rubber-based polymer is used.
Specific examples of the rubber polymer include natural rubber, butyl rubber, rubber ass, polyisoprene rubber, polyisobutylene rubber, NBR, recycled rubber, styrene / butadiene rubber, styrene / isoprene / styrene block copolymer rubber, styrene / butadiene / Styrene block copolymer rubber and the like can be mentioned. Basic performance such as water resistance can be adjusted by the type of the polymer component.

Specific examples of the tackifier include terpene resins such as α-pinene and β-pinene polymers, diterpene polymers and α-pinene-phenol copolymers, aliphatic petroleum resins and aromatic petroleum resins. Examples include petroleum resins such as petroleum resins, aliphatic / aromatic copolymer petroleum resins, rosin resins, coumarone indene resins, phenol resins, xylene resins, and alkyd resins. The adhesion to the gas pipe can be adjusted by the amount of the tackifier, and the amount is generally 5 to 1000 parts by weight, preferably 10 to 500 parts by weight, per 100 parts by weight of the polymer, but is not limited thereto. Not something.

On the other hand, as the grease type base, for example, an appropriate viscous composition known as grease obtained by mixing oil components such as drying oil, high-viscosity lubricating oil, mineral oil and non-drying oil may be used. There is no particular limitation. Above all, dry oils such as safflower oil, corn oil, sunflower oil, soybean oil, linseed oil, eno oil, drill oil, hemp oil, sardine oil, herring oil, and deer oil, animal and vegetable oils and petroleum-based lubricating oils Viscous compositions mainly composed of high-viscosity lubricating oils such as natural lubricating oils such as polyolefins such as polybutene and silicate esters and synthetic lubricating oils such as grease are preferably used from the viewpoint of water resistance.

The compound is compounded with a rust preventive and / or a sound insulating material so as to exhibit a corrosion-proof type or a sound-proof type, or a corrosion-proof and sound-proof type. That is, the adhesive water-shielding sheet shows an anticorrosion effect even when it does not contain a rust inhibitor based on the adhesiveness to the gas pipe, but enhances the anticorrosion effect by including a rust inhibitor in the compound. be able to. On the other hand, the soundproofing effect is generated by including the soundproofing material. In this case, when the adhesive waterproof sheet is mainly used for the soundproofing effect, the compounding ratio of the soundproofing material in the compound is increased. Further, in the case of an adhesive water-insulating sheet mainly having both a soundproofing effect and a high anticorrosion effect, the compounding ratio of both the rust inhibitor and the sound insulating material in the compound is increased.

As the rust preventive or the sound insulating material, an appropriate material such as a known material may be used. Incidentally, examples of the rust inhibitor include petrolatum, higher fatty acids, carboxylic acids such as naphthenic acid and alkenyl succinic acid, sodium salts and calcium salts such as carboxylic acids, organic acid salts such as barium salts and aluminum salts, magnesium salts, and sorbitan. Esters such as monooleate and dilauryl phosphate, amines such as cyclohexylamine, anionic and cationic such as alkylnaphthalenesulfonate, nonionic and amphoteric such as polyhydric alcohol ester and fatty acid sucrose ester And a surfactant such as a surfactant.

Examples of the sound insulating material include metals such as lead and metal smelting slag, and inorganic powders such as ceramics, and high specific gravity materials are preferably used.

In preparing the compound, in addition to the base component and the rust inhibitor and / or sound insulating material, if necessary, a general inorganic filler such as talc, calcium carbonate, bentonite or clay, ethylene -Organic fillers such as vinyl acetate copolymers and polyvinyl chloride, polymers such as ethylene-vinyl acetate-vinyl chloride copolymer and liquid rubber or carbon, plasticizers and softeners, antioxidants and colorants, Appropriate additives such as a fungicide, an antioxidant, and a thickener such as a pigment or a thixotropic agent can be blended.

The proportion of each component used in the compound can be appropriately determined according to the adhesive strength, viscosity or consistency, etc., but generally, 100 parts by weight of the base for forming the above-mentioned adhesive water-shielding sheet, and 5 parts of the rust inhibitor 5 -1000 parts by weight, especially 10-500 parts by weight, especially 20-300 parts by weight, sound insulation material 100-5000 parts by weight, especially 200-3000 parts by weight, especially 300-2000 parts by weight, and other additives 10
00 parts by weight or less, especially 5 to 500 parts by weight, particularly 10 to 2 parts by weight
A use ratio of 00 parts by weight is preferred.

The preparation of the compound can be carried out by mixing the components in an appropriate manner using, for example, a planetary mixer or a kneader. In addition, compounding into a sheet is also possible, for example, by adding fibers to the compound to impart shape retention, forming it into a sheet, impregnating the compound with a porous substrate, and placing the compound on a supporting substrate. It can be performed by an appropriate method such as an attached method.

In the above impregnation method, 50
Those adjusted to 400, especially 70 to 300, especially 100 to 200 are preferable from the viewpoint of workability of filling the porous base material and workability of the obtained adhesive water-shielding sheet. The porous substrate to be used is not particularly limited, and for example, an appropriate fiber such as a woven fabric, a nonwoven fabric, or a felt made of an appropriate fiber such as a polyester fiber, a polypropylene fiber, or a polyamide fiber can be used. A porous substrate that forms an adhesive water-shielding sheet having excellent flexibility in a state where the compound is impregnated is preferable. The porous base material functions as a holding material for the compound, a reinforcing material at the time of application work, a layer thickness adjusting material and a uniforming material, a protective material such as an impact absorbing material and a damage preventing material, and the like.

On the other hand, as a supporting base material used in the attachment method, a thin leaf made of an appropriate material such as paper or metal can be used, but generally, a film or foam made of plastic is used. As the plastic, for example, an appropriate plastic such as polyethylene, polypropylene, or soft polyvinyl chloride may be used, and there is no particular limitation. The thickness of the supporting substrate can be determined as appropriate, but is generally 10 to 500 μm, particularly 20 to 300 μm, from the viewpoint of flexibility.
In particular, 30 to 100 μm is preferable.

The thickness of the formed water-blocking sheet can be determined as appropriate. However, in general, the workability and the workability by the winding method, etc., especially the irregular shape of the gas pipe such as the elbow, valve, flange, etc. From the viewpoint of follow-up adhesion based on the flexibility to a deformed portion having a different diameter or the like, it is preferably 0.1 to 10 mm, particularly preferably 0.3 to 8 mm, particularly preferably 0.5 to 6 mm.

It is preferable to have a non-adhesive skin layer on one side to prevent adhesion, from the viewpoint of the handleability of the adhesive water-shielding sheet and the workability of a sound-absorbing foam molding layer provided on the outer periphery of the sheet layer. The non-adhesive skin layer can be formed by, for example, a method in which the above-mentioned supporting substrate is adhered. Therefore, in the above-mentioned compound attaching method, the supporting base material used for the compound can be used as it is as the non-adhesive skin layer.

When an adhesive water-insulating sheet having an excellent soundproofing effect is intended, it is preferable to form the sheet so that its surface density is 1.0 or more, especially 2 or more, especially 3 or more. On the other hand, as the surface density increases, the weight per unit area increases and it becomes difficult to perform construction. Therefore, it is preferable to set the surface density to 20 or less, especially 10 or less from the viewpoint of workability and the like. It is preferable to temporarily attach a separator or the like to the adhesive surface of the adhesive water-shielding sheet until it is practically used to prevent contamination and the like.

The adhesive water-impervious sheet can be adjusted to an appropriate form such as a tape or a small-area sheet which is advantageous for winding work or sticking work. It can also be formed as a molded product in advance to a developed shape of a covering form suitable for a modified portion made of, for example. The pressure-sensitive adhesive water-shielding sheet can also be formed as a layer having a layer excellent in anticorrosion effect and a layer excellent in soundproofing effect in a superposed state. Furthermore, a structure in which the gas pipes are overlapped and covered with each of the anticorrosion type and the soundproof type adhesive water-insulating sheets can also be used.

The sound-absorbing molded foam layer disposed outside the adhesive water-shielding sheet layer and covering the gas pipe exhibits a sound-proofing effect based on the sound-absorbing effect of the foam structure and a dew-proofing effect based on the heat-insulating effect. . The sound-absorbing molded foam layer can be formed by, for example, a molded foam or an integrated molded body of foam chips.

In particular, a foam chip prepared by pulverizing a foam into flakes or the like is adapted to a sheet, a tubular body, or an irregular part of a gas pipe by applying an adhesive to the surface thereof. What is filled into a predetermined mold that forms a coating form and then compression-molded can be preferably used. When it is formed in a covering form of a gas pipe for a cylindrical body or a deformed part, a method of forming a cut line or forming a half-split shape is preferable from the viewpoint of workability and the like. Although an appropriate adhesive can be used as the adhesive for compression bonding of the foam chip, a hot melt adhesive such as vinyl acetate is preferably used, and an emulsion type is preferably used from the viewpoint of applicability.

The foam used is not particularly limited, and an appropriate foam can be used. Incidentally, as examples, urethane foam, olefin foam such as polyethylene and polypropylene, acrylic foam, vinyl chloride foam, ethylene propylene foam, SBR foam,
Examples thereof include plastics and rubbers such as NR-based foams, NBR-based foams, and blended foams thereof.

The foam is preferably an open cell in terms of a soundproofing effect and a closed cell in terms of a heat insulating effect. Therefore, a foam having an appropriate foam structure can be used according to the purpose, and the sound-absorbing foamed molded article can also be formed using two or more foams. The thickness is from 1 to 100 mm, especially from 3 to 70 mm, especially from 5 to 40 mm from the viewpoint of soundproofing effect and dewproofing effect.
Is preferred. The sound-absorbing molded foam layer does not need to have a uniform thickness, and may have a partially different thickness particularly at an irregularly shaped portion.

It is preferable to provide a protective film layer on one surface, particularly the outer surface, of the sound absorbing foamed molded article layer in order to improve the soundproofing effect and prevent the foamed structure from being destroyed during construction or the like. For forming the protective coating layer, an appropriate material such as a support base material exemplified as the adhesive water-shielding sheet can be used. Above all, a film or sheet made of polyolefin such as polyethylene or polypropylene, soft polyvinyl chloride or the like is preferably used for the purpose of weight reduction or the like.

The thickness of the protective coating layer is preferably from 0.1 to 5 mm, more preferably from 0.5 to 3 mm, and particularly preferably from 1 to 2 mm, from the viewpoint of protection and the like. The adhesion treatment between the protective film layer and the sound-absorbing foamed molded article may be performed by an appropriate method such as an adhesion method using an adhesive or a heat fusion method.

In the structure according to the present invention, a waterproof protective tape layer for protecting and protecting the pressure-sensitive adhesive water-shielding sheet layer and the sound-absorbing foamed molded article layer which are located inside can be provided as required. The waterproof protective tape layer has the flexibility that it can be easily attached to the outer periphery of the sound-absorbing foamed molding layer by a winding method or a sticking method, etc., and after the application, it is in a state excellent in internal protection as a solid material. preferable. The purpose can be achieved by, for example, a hardening type waterproof protection tape.
The waterproof protective tape can be formed, for example, as a tape formed by impregnating a porous substrate with a compound composed of an aqueous polymer dispersion containing an inorganic filler.

In the above, the waterproof protective tape is more preferably excellent in moisture permeability resistance, and is cured (solidified).
Preferably proceeds by natural drying. That is, the polymer aqueous dispersion is contained in an uncured state before being dried and solidified, and exhibits good workability due to good flexibility, and after being dried and solidified (cured) in a short time even by a natural drying method. It is preferable to form a composite comprising a porous substrate and a cured product of a polymer compound and having excellent strength and impact resistance.

The above-mentioned waterproof protective tape is formed by, for example, acrylic resin, polyvinyl chloride, vinyl chloride / vinyl acetate copolymer or rubber, chlorinated polyolefin or polyethylene, ethylene / vinyl acetate copolymer or ethylene / vinyl acetate.
Propylene copolymer, ethylene / ethyl acrylate copolymer, polyvinyl butyral, polybutadiene, epoxy resin, amino resin, urethane resin, silicone resin, alkyd resin, emulsion of appropriate polymer such as phenol resin, etc. Using a water dispersion of the polymer and an inorganic filler or a porous substrate exemplified in the above-mentioned adhesive water-shielding sheet.

By using the polymer aqueous dispersion, the use of an organic solvent can be avoided, the dissolution of the sound-absorbing foamed molded article layer by the organic solvent can be prevented, and it is possible to coat directly on the upper surface of the sound-absorbing foamed molded article layer. Further, film formation by drying and solidification after construction can also be achieved. In the case where the sound-absorbing foamed molding layer has a protective film layer and withstands a solvent, a solvent-type polymer solution or the like may be used.

In the above, the proportion of the polymer and the inorganic filler used can be appropriately determined according to the strength of the film to be formed and the like, and is generally 300 parts by weight or less, preferably 1 part by weight, per 100 parts by weight of the polymer (solid content). ~ 200 parts by weight, especially 5
１００100 parts by weight are used. The impregnating liquid for the porous substrate can be prepared by mixing the aqueous polymer dispersion and the inorganic filler. In the preparation, for example, a plasticizer, an antioxidant, a fungicide, an antioxidant, a pigment or a coloring agent is used. An appropriate additive such as an agent can be blended as needed.

The thickness of the waterproof protective tape is 0.1 to 2 mm, preferably 0.2 to 1.5 mm, particularly 0.4
It is preferable to use a porous substrate having a thickness of 0.8 to 0.8 mm and a thickness of 0.3 to 3 mm, preferably 0.4 to 2 mm, particularly 0.5 to 1 mm. B ~ 3H based on pencil hardness by drying and solidification,
Those which form a film having a hardness of HB to H are preferable.

The top coat layer is provided on the outermost surface of the gas pipe coating structure as necessary for the purpose of water-blocking effect and colorization unique to the gas supplier. The top coat layer can be formed by a coating method such as an epoxy resin coating, an amino resin coating, a urethane resin coating or a silicone resin coating, an alkyd resin coating or a phenol resin coating, or a vinyl coating. Appropriate materials such as resin-based paint, latex or rubber-based paint can be used.

Preferred paints are excellent in water resistance, weather resistance, discoloration resistance, etc., and are excellent in waterproofness and durability. When provided directly on the waterproof protective tape layer, they have good adhesion to the dried and solidified waterproof protective tape. It is excellent. In general,
Urethane resin paints are preferred, but not limited thereto. The paint may be of any type such as an emulsion type or a solution type, and may be a cross-linking and curing type. In the coating material, for example, an appropriate additive such as a filler, an antioxidant, a fungicide, an antioxidant, an ultraviolet absorber, an antiozonant, a pigment or a coloring agent can be added as necessary. .

As described above, the waterproof protective tape layer can be easily applied by a winding method or a sticking method, and the top coat layer can be formed with good workability or workability by a resin coating method. The top coat layer also has an advantage that contamination due to adhesion of dust or the like that is difficult to wipe is prevented for a long time, and an excellent appearance is maintained for a long time.

The soundproofing, corrosionproofing and dewproofing structure of the present invention can be formed, for example, by the following method. In other words, the adhesive water-blocking sheet is applied directly to the gas pipe to be applied,
After forming an adhesive water-shielding sheet layer by applying an appropriate method such as a horizontal winding method or a vertical application method, a sound-absorbing foamed molded article is applied thereon by a direct winding method or a mounting coating method, etc. A sound-absorbing foamed molded article layer is formed so as to cover the water sheet layer.

Next, if necessary, a waterproof protective tape is applied on the sound-absorbing foamed molded article layer by an appropriate method such as a direct winding method, an adhesive method, a horizontal winding method, a vertical adding method, and the like. After being dried and solidified by an appropriate method such as a drying method or a forced drying method using a drier or the like, a paint is applied on the waterproof protective tape layer by an appropriate method such as a coating method or a spraying method and dried. It can be carried out by a method of curing and forming a top coat layer composed of a paint film. In the above, between the adhesive water-insulating sheet layer, the sound-absorbing foamed molded article layer, the waterproof protective tape, and the like, an appropriate blocking layer made of a film such as polyethylene or polypropylene may be interposed as necessary. When forming the top coat layer,
It is desirable that the waterproof protective tape layer is solidified to such an extent that it does not substantially show an adhesive force, but it is possible to apply a paint even in an unsolidified state.

The soundproofing, corrosionproofing and dewproofing structure of the present invention can be preferably applied to gas pipes made of various metals, particularly iron-based metals.
The present invention can be applied to gas pipes for various purposes such as gas pipes by gas suppliers and gas pipes in petrochemical plants and the like. In particular, the present invention can be advantageously applied to a gas pipe or the like accompanied by noise and dew due to a cooling effect by adiabatic injection of gas.

[0046]

【Example】

Example 1 20 parts of butyl rubber (parts by weight, the same applies hereinafter), inorganic filler 6
0 parts, 10 parts of a softening agent and 10 parts of a tackifier are kneaded and formed into a sheet, and a 6 mm-thick adhesive water-impervious sheet (area density 1.7) is placed in an operating gas pressure regulator. The outlet side elbow part of the governor (to the flange connection part at one end including the elbow and the floor at the other end) and the outer periphery of the riser with a blind flange connected under the floor to the elbow are coated in a single layer by the adhesive method. To provide an adhesive water-impermeable sheet layer.

Next, E was placed on a 1 mm-thick protective film made of polyvinyl chloride containing 30% by weight of an inorganic filler.
50 parts of PDM foam chip and urethane foam chip 50
A 30-mm-thick foamed layer made of a mixture of the above-mentioned parts is closely adhered, and a single layer of a sound-absorbing foamed molded article having a total thickness of 31 mm and a half-split covering form is mounted on the outer periphery of the above-mentioned adhesive water-shielding sheet layer. Thus, a sound-absorbing foamed molded body layer was provided to form a sound-proof, corrosion-proof and dew-proof structure.

Example 2 30 parts of linseed oil, 20 parts of bentonite, 35 parts of aluminum hydroxide (flame retardant), 13 parts of tackifier and 2 parts of a dryer were kneaded and formed into a sheet. 1
The sound-proof, corrosion-proof, and dew-proof structure is the same as in Example 1 except that the adhesive water-shielding sheet layer is formed by a 55% wrap winding method using a tape-shaped adhesive water-shielding sheet (area density: 1.3) having a width of 100 mm and a width of 100 mm. Obtained.

Example 3 Acrylic emulsion 60 parts, aluminum hydroxide 35
Parts, a mixture of 2.5 parts of a thickener and 2.5 parts of a pigment is impregnated into a nonwoven fabric, and a 0.6% thick, 100 mm wide waterproof protective tape is 55% wrapped around the sound-absorbing foamed molding layer. , And then allowed to dry naturally to obtain a soundproof, corrosion and dew proof structure according to Example 1 except that a waterproof protective tape layer was added.

Example 4 A soundproof, corrosionproof and dewproofing structure was obtained in the same manner as in Example 3, except that a waterproof protective tape layer was added on the sound absorbing foamed molded article layer.

Comparative Example 1 A soundproof and dew-proof structure was obtained in the same manner as in Example 1 except that a sound-absorbing foamed molded article layer was provided directly on a gas pipe without providing an adhesive water-shielding sheet layer.

Comparative Example 2 An anticorrosive coating made of a phthalic acid paint was applied to the gas piping according to Example 1, and a 50 mm-thick rock wool layer was provided on the outer periphery thereof. A soundproof and dew-proof structure was obtained by fixing with a split tube.

Evaluation Test Regarding the soundproof (corrosion) and dewproof structures obtained in the examples and comparative examples,
The sound was measured at a position 100 mm above the center of the elbow. After standing for 6 months, the coating layer was peeled off, and the presence or absence of rust in the gas pipe was examined. Further, it was examined whether or not dew condensation occurred on the surface of the coating layer. The sound level without the soundproof (corrosion-proof) dew-proof structure was 100 dB.

The results are shown in the following table.

[Brief description of the drawings]

FIG. 1 is a sectional view of an embodiment.

[Explanation of symbols]

 1: Gas pipe 2: Adhesive water-shielding sheet layer 21: Non-adhesive skin layer 3: Sound absorbing foam molding layer 31: Protective coating layer 4: Waterproof protective tape layer 5: Top coat layer

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Kazumasa Asano 1-1-2 Shimohozumi, Ibaraki-shi, Osaka Nitto Denko Corporation (72) Inventor Kenjiro Hayashi 1-1-1-2 Shimohozumi, Ibaraki-shi, Osaka No. Within Nitto Denko Corporation (72) Inventor Yoshiaki Mitsuoka 1-1-2 Shimohozumi, Ibaraki City, Osaka Prefecture Inside Nitto Denko Corporation (72) Noriyuki Matsumoto 1-2-1, Shimohozumi, Ibaraki City, Osaka Prefecture Within Nitto Denko Corporation (72) Inventor Muneki Tsuge 1-5-20 Kaigan, Minato-ku, Tokyo Tokyo Gas Incorporated (72) Inventor Yoshio Sekine 1-5-20 Kaigan, Minato-ku, Tokyo Tokyo Gas Stock Inside the company (72) Kenji Kazushi, Inventor 1-5-20 Kaigan, Minato-ku, Tokyo Tokyo Gas Co., Ltd. (72) Yoshikuni Uchida 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Japan Inside the Steel Pipe Co., Ltd. (72) Inventor Kazuo Horiuchi 88, Ono-cho, Tsurumi-ku, Yokohama-shi, Kanagawa Prefecture Japan Steel Pipe Construction Co., Ltd.

Claims (7)

[Claims] At least one of an adhesive water-insulating sheet layer that contains at least one of a rust inhibitor and a sound insulating material and is in close contact with a gas pipe, and a sound-absorbing foamed molded article layer that is disposed outside and covers the gas pipe. The gas pipe is soundproof, corrosionproof and dewproof. 2. The waterproof protective tape layer according to claim 1, wherein the adhesive water-shielding sheet layer has a non-adhesive skin layer on its outer surface, a sound-absorbing foamed molding layer is adjacent to the non-adhesive skin layer, and a gas pipe is coated on the outside thereof. Soundproof, corrosion and dew proof structure with 3. The soundproofing, corrosionproof and dewproofing structure according to claim 2, further comprising a topcoat layer made of a colored resin film on the outer surface of the waterproof protective tape layer. 4. An adhesive water-shielding sheet containing at least one of a rust inhibitor and a sound insulating material, and having gas pipe adhesion based on adhesive strength. 5. The method according to claim 4, wherein a non-adhesive skin layer is provided on one surface, and the gas pipe has a follow-up adhesiveness to a deformed portion such as an elbow portion, a valve portion or a flange portion, and has a surface density of 1.0 or more. There is a sticky waterproof sheet. 6. The adhesive according to claim 4, wherein the adhesive has a non-adhesive skin layer on one surface, exhibits close adherence to irregular portions such as an elbow portion, a valve portion, and a flange portion of a gas pipe, and has a high anticorrosion property. Impermeable sheet. 7. A sound-absorbing foamed article characterized in that it has a protective coating layer on one surface of a sound-absorbing foamed article layer formed of an integrated molded article of foam chips formed in a gas pipe covering form.