[go: up one dir, main page]

WO2019013340A1 - Structure anticorrosion et procédé de construction anticorrosion, et élément pour structure anticorrosion - Google Patents

Structure anticorrosion et procédé de construction anticorrosion, et élément pour structure anticorrosion Download PDF

Info

Publication number
WO2019013340A1
WO2019013340A1 PCT/JP2018/026580 JP2018026580W WO2019013340A1 WO 2019013340 A1 WO2019013340 A1 WO 2019013340A1 JP 2018026580 W JP2018026580 W JP 2018026580W WO 2019013340 A1 WO2019013340 A1 WO 2019013340A1
Authority
WO
WIPO (PCT)
Prior art keywords
silicone
based member
self
adhesive
corrosion
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2018/026580
Other languages
English (en)
Japanese (ja)
Inventor
佐藤　昭良
和弘 棚木
総一郎 二坂
宏之 桜井
貴男 中村
浩輔 白方
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shin Etsu Polymer Co Ltd
Shin Etsu Chemical Co Ltd
Original Assignee
Shin Etsu Polymer Co Ltd
Shin Etsu Chemical Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP2017138287A external-priority patent/JP6983561B2/ja
Priority claimed from JP2017138288A external-priority patent/JP2019019883A/ja
Application filed by Shin Etsu Polymer Co Ltd, Shin Etsu Chemical Co Ltd filed Critical Shin Etsu Polymer Co Ltd
Publication of WO2019013340A1 publication Critical patent/WO2019013340A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
    • F16L55/16—Devices for covering leaks in pipes or hoses, e.g. hose-menders
    • F16L55/168—Devices for covering leaks in pipes or hoses, e.g. hose-menders from outside the pipe
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
    • F16L58/02—Protection of pipes or pipe fittings against corrosion or incrustation by means of internal or external coatings
    • F16L58/16—Protection of pipes or pipe fittings against corrosion or incrustation by means of internal or external coatings the coating being in the form of a bandage
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A20/00—Water conservation; Efficient water supply; Efficient water use
    • Y02A20/20—Controlling water pollution; Waste water treatment

Definitions

  • the present invention relates to an anticorrosion structure and an anticorrosion method, and a member for the anticorrosion structure, for the purpose of preventing the corrosion of a connection portion of a pipe.
  • Petrolatum is a semi-solid mixture of a soft wax obtained by solvent dewaxing a lubricating oil fraction of petroleum and a heavy fraction of lubricating oil, which has excellent water repellency and suppresses water permeation. Excellent in effect.
  • the softening temperature is low, it melts in summer or under high temperature environment, and the phenomenon that the liquid component exudes to the surface (bleed out phenomenon) becomes a problem.
  • the anticorrosion tape of Patent Document 1 has the following problems. First, since it is not dry at the time of construction, it takes about 24 to 72 hours of drying time after construction in a state where contamination by soil dust is prevented, and a prolonged construction period becomes a problem. Moreover, although it contains the inorganic particle as a flame retardant, since it is a non-woven fabric impregnated with oil essentially, there is a concern in terms of fire resistance. Furthermore, it is said that it is said that it is said that it is said that it is said that it is preferable to add beforehand the component used as the polymeric compound hardened
  • the deterioration of the anticorrosion tape with age is rapid, and the useful life of the anticorrosion tape is shorter than the life of the target metal to be installed, such as a steel pipe. If it does so, it will be necessary to remove the anticorrosion tape which deteriorated over time, and to perform maintenance inspections, such as a steel pipe etc., but it may be difficult to remove the hardened anticorrosion tape and to perform maintenance inspection.
  • the present invention provides a corrosion-resistant structure and a corrosion-resistant construction method using a silicone-based member that is easy to apply, and a member for corrosion-resistant structure.
  • a corrosion resistant structure provided with a metal pipe and a self-adhesive or self-fusion type silicone-based member wound around a connection part of the metal pipe.
  • a first silicone-based member wound around the connection portion, and a second silicone-based member wound on the first silicone-based member in an overlapping manner are provided.
  • the first silicone-based member is a tape-like member, and the second silicone-based member is in the form of a tape or sheet wider than the first silicone-based member, and the second silicone is used.
  • a corrosion-resistant structural member wound around a connecting portion of a metal pipe which is formed of a self-adhesive or self-bonding silicone-based member.
  • a non-silicone sealing tape wound around the connection portion of the metal pipe, and the self-bonding type silicone system member wound and stacked on the sealing tape are provided.
  • the specified international rubber hardness (IRHD hardness) is 10 to 50, and the ratio (W2 / W1) of the width W1 before winding of the self-bonding type silicone based member to the width W2 after winding is 0.
  • the corrosion-resistant construction method according to [5] which is wound so as to be 5 to 0.8.
  • the silicone-based member since the silicone-based member is wound around the connection portion of the metal pipe, it prevents corrosion of water or oxygen causing the corrosion to the contact portion, thereby preventing corrosion, Excellent weather resistance and durability. In addition, it is advantageous in terms of fire resistance as compared to conventional anticorrosion tapes impregnated with oil. Furthermore, since it does not exhibit a sticky viscosity after construction, it is possible to prevent the contamination of the connection even in a dusty environment. Moreover, the silicone-based member after construction can be easily removed as needed.
  • the construction can be completed by winding the silicone-based member not exhibiting the viscosity around the connection portion, so that the construction can be completed simply and in a short period of time without requiring a drying time.
  • the silicone-based member after construction can be easily removed as necessary, maintenance and inspection of the connection portion of the pipe can be easily performed.
  • the corrosion resistant structural member of the present invention is useful in the above-described corrosion resistant construction and corrosion resistant construction method.
  • connection part of metal piping It is a side view which shows an example of the connection part of metal piping. It is a side view which shows an example which covered the single tape-like member in the shape of a spiral in the connection part of metal piping. It is a side view showing an example which piled up a plurality of tape-like members on the connection part of metal piping, and was covered spirally. It is a perspective view which shows an example of the construction method which winds a silicone type member around the connection part of metal piping installed in the groove
  • a first aspect of the present invention is a corrosion-resistant structure provided with a metal pipe and a self-adhesive silicone-based member wound around a connection part of the metal pipe.
  • the threaded portion A of the metal pipe 10 is a portion where the groove 11 of the external thread is formed at the end of the first pipe 10, and is generally a portion where corrosion is likely to occur.
  • the internal thread of the second pipe 20 may be superimposed on the external thread 11, and the threaded portion A in this case is called a pipe connection.
  • the connection portion of the metal pipe is not limited to threading but may be a portion connected by welding.
  • the shape in the longitudinal direction of the first pipe 10 and the second pipe 20 is not particularly limited, and may be linear or bent. Further, the length in the longitudinal direction is also not particularly limited, and may be, for example, about 30 cm to 1 m.
  • the corrosion-resistant structure of the first embodiment is provided with a self-adhesive silicone-based member 30 wound around a threaded portion A of a metal pipe 10.
  • the threaded portion (connection portion) A of the first pipe 10 and the second pipe 20 is made of metal, and in the state in which the self-adhesive type silicone-based member 30 is wound, the threaded portion A is formed by the silicone-based member 30. It is coated and protected from oxygen and moisture causing corrosion.
  • the silicone-based member 30 is removed (see FIG. 1), at least a part of the metal of the threaded portion (connection portion) A is exposed.
  • the self-adhesive silicone-based member 30 used in the present embodiment is a member made of a curable silicone rubber which is in an uncured state before use and is cured after being wound around a connection portion.
  • the curable silicone rubber is generally classified into two types. One is a so-called addition-curable silicone rubber which is stored at a low temperature when not in use and is cured by heating to a temperature above normal temperature during curing. The other is a so-called condensation type silicone rubber which is stored in a dry environment (moisture-proof environment) when not in use and is cured by absorbing moisture in the air when it is cured.
  • the self-adhesive silicone-based member 30 of this embodiment may be an addition curing type or a condensation curing type.
  • the curable silicone rubber can be molded into the desired shape and retain the shape after molding.
  • the curable silicone rubber is non-flowable and has the property of being deformed by compression.
  • the curable silicone rubber preferably has a Williams plasticity (25 ° C.) of 50 to 450, and particularly preferably 50 to 300. If the degree of deformation is within the above range, it can be molded into a desired shape in an uncured state, and it can be easily deformed when compressed although it can retain its shape.
  • the degree of William plasticity is above the lower limit value, it can be molded without flowability, and if it is below the above upper limit value, it can be easily deformed when compressed.
  • the degree of Williams plasticity is measured according to JIS K 6249: 1997 "Test method of uncured and cured silicone rubber”.
  • a parallel-plate plasticity meter (“Uriam Plus and Meter” manufactured by Ueshima Seisakusho Co., Ltd.) with a dial gauge by using a spherical test piece of 2 g of a curable silicone rubber under an environment of 25 ° C and sandwiching this test piece in cellophane paper
  • the test piece is placed in the container and loaded for 3 minutes under a load of 5 kg, and then the dial gauge is read to a millimeter, the thickness of the test piece is recorded, and this value is multiplied by 100 to obtain the degree of freedom.
  • the threaded portion A is preferably subjected to primer treatment in advance.
  • the selection of the primer agent can be optionally selected from known primer agents depending on the type of curable silicone rubber constituting the silicone-based member 30 used.
  • the adhesive strength of the curable silicone rubber to the primer-treated SUS 304 is preferably 10 N / mm or more when evaluated based on, for example, the “90-degree peel test adhesive strength” of JIS K 6854-1: 1999. .
  • the upper limit value is not particularly limited, but in consideration of removing the silicone-based member 30 from the threaded portion A for maintenance inspection, for example, about 100 N / mm may be mentioned as the upper limit.
  • the hardness after curing of the curable silicone rubber constituting the silicone-based member 30 is referred to as "Part 3: JIS K 6253: 2012".
  • Part 3 JIS K 6253: 2012
  • it evaluates based on durometer hardness (type A) it is preferable that it is A40 or more.
  • the upper limit value is not particularly limited, in consideration of removing the silicone-based member 30 from the threaded portion A for maintenance and inspection, for example, about A90 may be mentioned as the upper limit.
  • a suitable self-adhesive silicone-based member having the above-mentioned William's plasticity, adhesive strength and hardness for example, HR-2388S (addition-curable type, room temperature curing, sold as “Polymer Ace” manufactured by Shin-Etsu Polymer Co., Ltd.
  • HR-120S additional curing type, heat curing
  • HR-120NP additional curing type, heat curing
  • HJ-14S condensation curing type
  • HJ-1588L condensation curing type
  • a tape-like, self-adhesive silicone-based member 30 is spirally wound around the threaded portion A.
  • the width and length of the tape are appropriately set in accordance with the length of the threaded portion A. For example, when the length along the longitudinal direction of the pipe (diameter 5 cm) of the threaded portion A is 15 cm, the width 2 mm of the tape The length of the tape may be about 100 cm to about 20 cm to 30 cm.
  • the self-adhesive silicone-based member 30 cut into a wide sheet shape may be wound.
  • the thickness of the self-adhesive silicone-based member 30 is preferably 0.3 to 10 mm, more preferably 1 to 2 mm.
  • the above self-adhesive silicone-based member is excellent in adhesion, durability, and handleability, and thus is extremely useful as a corrosion-resistant structural member wound around a connection portion of metal piping.
  • the above-mentioned self-adhesive type silicone system member is transparent. By being transparent, it is possible to see through the wound self-adhesive silicone-based member and observe the state of the connection inside the corrosion-resistant structure. Since the appearance of the connection can be observed without removing the corrosion resistant structure, the necessity of maintenance of the piping including the connection can be easily examined.
  • the self-adhesive silicone-based member 30 since the self-adhesive silicone-based member 30 is directly wound around the threaded portion A of the metal pipe 10, 20, the silicone-based member relative to the threaded portion A 30 adheres well. As a result, it is possible to prevent water or oxygen causing corrosion from coming into contact with the threaded portion A, so that the corrosion resistance, weather resistance and durability of the threaded portion A can be sufficiently obtained.
  • the self-adhesive type silicone-based member 30 after curing does not exhibit a sticky viscosity, it is possible to prevent the contamination of the threaded portion A even in a dusty environment.
  • by cutting the wound silicone-based member 30 with a cutter or the like along the longitudinal direction of the threaded portion A it can be easily removed after construction if necessary.
  • the first silicone-based member 30 wound around the threaded portion A of the metal pipe and the first silicone-based member 30 are stacked. And the second silicone-based member 40 that is wound.
  • the first silicone-based member 30 is completely covered by the second silicone-based member 40 and is not exposed to the outside.
  • the first silicone-based member 30 may be the self-adhesive silicone-based member described above, or may be the self-bonding silicone-based member described later.
  • the second silicone-based member 40 may be the self-adhesive silicone-based member described above, or may be a self-bonding silicone-based member described later.
  • the first silicone-based member 30 is a self-adhesive silicone-based member and the second silicone-based member 40 is a self-fusion-type silicone-based member;
  • a first And the second silicone-based member 40 is a self-adhesive silicone-based member; and
  • the first silicone-based member 30 is a self-adhesive silicone-based member.
  • the second silicone-based member 40 is also a self-adhesive silicone-based member.
  • (a) or (c) is preferable because the first silicone-based member 30 is excellent in adhesion to the metal threading portion A in the uncured state, and the second silicone-based member 40 is overlapped.
  • (A) is more preferable because the first silicone-based member 30 is compressed and the adhesion of the entire corrosion-resistant structure to the metal threaded portion A is further excellent.
  • the tape-shaped first silicone-based member 30 is spirally wound so as to cover the threaded portion A, and the tape-shaped second silicone-based member 40 is further formed thereon. It is spirally wound so as to cover one silicone-based member 30.
  • the relationship between the width of the first silicone-based member 30 and the width of the second silicone-based member 40 is not particularly limited.
  • both may be in the form of a tape having a width of about 1 cm to 3 cm, or any one May be wider than the other tape shape, for example, in the form of a tape or sheet having a width of 4 cm to 20 cm.
  • the length of the tape-like member is longer than the width of the tape-like member, and the length of the sheet-like member is the same as or longer than the width of the sheet-like member.
  • the first silicone-based member 30 is in the form of a tape, and is spirally wound at least around the threaded portion A. Is preferred. Further, the second silicone-based member 40 is in a sheet-like or tape-like shape wider than the tape-like shape of the first silicone-based member 30, and wound so as to cover the entire first silicone-based member 30. It is more preferable that
  • the self-bonding type silicone-based member of this embodiment is preferably a member made of a self-bonding type silicone rubber.
  • the self-bonding silicone rubber is used in a pre-cured state without requiring a curing treatment at the time of use.
  • a self-bonding silicone rubber for example, a silicone composition containing a diorganopolysiloxane shown by the following average composition formula (I) and a boric acid compound, which is disclosed in JP-A-2016-114180 A cured product obtained by curing
  • R 1 n SiO (4-n) (I) [In Formula (I), R 1 represents a hydrocarbon group having 1 to 10 carbon atoms, and n represents any number in the range of 1.98 to 2.02. ]
  • R 1 in the formula (I) is a hydrocarbon group having 1 to 10, preferably 1 to 8 carbon atoms.
  • a hydrocarbon group an alkyl group, a cycloalkyl group, an alkenyl group, an aryl group etc. are mentioned.
  • an alkyl group a methyl group, an ethyl group, a propyl group, a butyl group etc. are mentioned, for example.
  • a cycloalkyl group, a cyclohexyl group etc. are mentioned, for example.
  • As an alkenyl group a vinyl group, an allyl group, a butenyl group, a hexenyl group etc. are mentioned, for example.
  • R 1 may be a group in which part or all of the hydrogen atoms of the hydrocarbon group are substituted with a halogen atom, a cyano group or the like.
  • R 1 is an alkenyl group in the case of promoting the curing with an organic peroxide such as hydroperoxide, dialkyl peroxide, peroxy ester, diacyl peroxide, peroxy dicarbonate, etc. when curing the silicone composition Or a group in which part or all of the hydrogen atoms of the alkenyl group are substituted with a halogen atom or a cyano group.
  • N in the formula (I) is preferably 1.98 to 2.02 from the viewpoint of sufficiently obtaining the self-bonding property.
  • the kinematic viscosity at 25 ° C. of the diorganopolysiloxane is preferably 100 to 100,000,000 cSt, and more preferably 100,000 to 10,000,000 cSt. It is preferable for the dynamic viscosity at 25 ° C. of the diorganopolysiloxane to be in the above-mentioned range because the mechanical properties after curing are excellent.
  • boric acid compound examples include boric acids such as boric anhydride, pyroboric acid and orthoboric acid; derivatives of boric anhydride such as trimethyl borate, triethyl borate and trimethoxyboroxine, and the like.
  • boric acid compound for example, a polyorganoborosiloxane obtained by condensing an organoalkoxysilane such as dimethyldimethoxysilane or dimethyldiethoxysilane with boric anhydride can also be used.
  • the boric acid compounds may be used alone or in combination of two or more.
  • the content of the boric acid compound in the self-bonding type silicone-based member is preferably 0.1 to 50 parts by mass, and more preferably 0.5 to 30 parts by mass with respect to 100 parts by mass of the diorganopolysiloxane. Is more preferable, and 1 to 5 parts by mass is more preferable. If the content ratio of the boric acid compound is equal to or more than the lower limit value, sufficient self-bonding property can be secured, and if it is equal to or less than the upper limit value, a decrease in mechanical physical properties can be suppressed.
  • the tensile strength (unit: N) along the longitudinal direction of the tape-like or sheet-like self-bonding type silicone-based member is preferably larger than the maximum load of the self-adhesive-type silicone-based member after curing, for example, 70 N It is preferable that it is more than, It is more preferable that it is 80 N or more, It is more preferable that it is 100 N or more.
  • the tensile elongation along the longitudinal direction of the tape-like or sheet-like self-bonding type silicone-based member is preferably larger than the tensile elongation of the self-adhesive type silicone-based member after curing, for example, 300% or more Is preferably 400% or more, and more preferably 500% or more.
  • the above tensile strength and tensile elongation rate are above the lower limit value, sufficiently high self-bonding property can be exhibited, and it is more preferable for a threaded portion of a pipe or a self-adhesive silicone-based member wound there It can be in close contact.
  • the above tensile strength and tensile elongation are values measured at 23 ° C. at a tensile speed of 500 mm / min along the longitudinal direction of the tape-like or sheet-like silicone-based member using a tensile tester.
  • the above self-bonding type silicone-based member is preferably transparent. By being transparent, it is possible to see through the wound self-bonding type silicone based member and observe the state of the connection inside the corrosion resistant structure. Since the appearance of the connection can be observed without removing the corrosion resistant structure, the necessity of maintenance of the piping including the connection can be easily examined.
  • a second aspect of the present invention is an anti-corrosion method in which a self-adhesive silicone-based member is wound around a connection portion of metal piping. By this construction method, the corrosion resistant structure of the first aspect can be formed.
  • a tape-like or sheet-like self-adhesive silicone-based member is used as a method of winding the self-adhesive silicone-based member around the threaded portion A of the metal pipe 10 of FIG. 1.
  • a method of spirally winding to the side is used as a method of winding the self-adhesive silicone-based member around the threaded portion A of the metal pipe 10 of FIG. 1.
  • a tape-like or sheet-like first silicone-based member 30 is spirally wound on the threaded portion A of the pipe 10 of FIG. 1 (the pipe connection portion A of the pipes 10 and 20). Is covered, it becomes the form shown in FIG. Then, the tape-like or sheet-like second silicone-based member 40 is superimposed on the first silicone-based member 30 covering the screw-off portion A and wound in a spiral, thereby covering the first silicone-based member 30.
  • the longitudinal direction of each of the silicone-based members to be spirally wound be along the spiral circumferential direction.
  • the first silicone-based member 30 and the second silicone-based member 40 may be independently a self-adhesive silicone-based member or a self-fusion-type silicone-based member. Preferred combinations include (a) to (c) described above.
  • Curing of the self-adhesive silicone may be promoted by heating the self-adhesive silicone-based member after being wound around the threaded portion A. This is because the properties of the self-adhesive silicone-based member are sufficiently exhibited after curing.
  • a method of heating for example, a method of blowing hot air with a dryer can be mentioned.
  • winding the self-bonding type silicone-based member around the threaded portion A it is preferable to wind the self-bonding-type silicone-based member while stretching it in the longitudinal direction, from the viewpoint of enhancing adhesion and self-bonding power.
  • the following method may also be mentioned as a method of winding a self-adhesive silicone-based member around the threaded portion A (see FIG. 4).
  • the non-adhesive surface of the self-adhesive silicone-based member 60 is placed on the support film 50 so as to be in contact with it, and the intermediate 70 is obtained with the adhesive surface 60a opposite to the non-adhesive surface exposed on the surface.
  • the adhesive surface 60a of the intermediate body 70 is brought into close contact with the first portion Aa of the threaded portion A (portion on the back side of the drawing of FIG. 4), and the support film 50 of the pair of end portions 50a and 50b of the support film 50.
  • the first end 50a While winding the first end 50a side toward one side as viewed from the first portion Aa of the threaded portion A (directed from the left to the right with respect to the pipe of FIG. 4), the first end 50a is first portion Pull to the back side of Aa (opposite direction), that is, the near side of the paper surface of FIG.
  • the second end 50b is pulled in the back direction (opposite direction) of the first portion Aa.
  • the direction in which the first end 50a and the second end 50b are pulled is indicated by the arrow in FIG.
  • the adhesive surface 60a of the self-adhesive silicone-based member 60 can be pressed against the threaded portion A including the first portion Aa, so that winding can be performed while sufficiently adhering closely.
  • self-adhesive silicone-based members 60 can be wound. After winding, the support film 50 is removed.
  • the support film 50 for example, a relatively flexible resin film such as polyethylene, polyolefin, polyester, etc. is preferable.
  • the size of the support film 50 is preferably larger than that of the self-adhesive silicone-based member 60 from the viewpoint of facilitating the winding operation.
  • a metal pipe and a silicone-based member wound around a connection portion of the metal pipe are provided, and the silicone-based member is a self-fusion type silicone-based member. It is a corrosion resistant structure.
  • the self-bonding type silicone-based member may be wound directly to the connection portion or may be wound indirectly via another member.
  • Metal pipe is as described above.
  • the corrosion resistant structure of the third embodiment is provided with a non-silicone sealing tape 30 spirally wound around the threaded portion A of the metal pipe 10. Furthermore, as shown in FIG. 3, a self-bonding type silicone-based member 40 wound on the sealing tape 30 is provided. In the example of FIG. 3, the sealing tape 30 is completely covered by the self-bonding type silicone-based member 40 and is not exposed to the outside.
  • the sealing tape 30 of FIG. 2 may be replaced by a self-bonding type silicone-based member.
  • the self-bonding type silicone-based member is directly wound around the threaded portion A.
  • Another self-bonding type silicone-based member may be further wound on the self-bonding-type silicone-based member.
  • the threaded portion (connection portion) A of the first pipe 10 and the second pipe 20 is made of metal.
  • the threaded portion A is covered with the sealing tape 30 and the self-bonding-type silicone-based member 40 to cause oxygen causing corrosion. And protected from moisture.
  • the sealing tape 30 and the self-bonding type silicone-based member 40 are removed (see FIG. 1), at least a part of the metal of the threaded portion (connection portion) A is exposed.
  • the relationship between the width of the sealing tape 30 and the width of the self-bonding type silicone-based member 40 is not particularly limited.
  • both may be in the form of a tape having a width of about 1 cm to 3 cm. It may be in the form of a tape or a sheet, for example, 4 cm to 20 cm in width, which is wider than that of the tape.
  • the length of the tape-like member is longer than the width of the tape-like member, and the length of the sheet-like member is the same as or longer than the width of the sheet-like member.
  • the width and length of the tape-shaped member are appropriately set in accordance with the length of the threaded portion A. For example, when the length along the longitudinal direction of the pipe (diameter 5 cm) of the threaded portion A is 15 cm, the tape-shaped member 1 cm to 3 cm in width and about 20 cm to 30 cm in length.
  • the sealing tape 30 is preferably wound in a spiral shape around the threaded portion A.
  • the self-bonding type silicone-based member 40 is in the form of a sheet or tape that is wider than the tape-like shape of the sealing tape 30, and is wound so as to cover the entire sealing tape 30. preferable.
  • the seal tape 30 is reinforced while reducing the thickness of the corrosion resistant structure. Corrosion resistance and durability can be improved.
  • the seal tape 30 is directly wound around the threaded portion A of the metal pipe 10, 20, the seal tape 30 is sufficiently in intimate contact with the threaded portion A. doing. Furthermore, since the self-bonding type silicone-based member 40 excellent in water resistance, durability, and weather resistance is overlapped and wound, adhesion to the threaded portion A of the seal tape 30 is further enhanced, and the seal tape 30 is formed. As it can be protected from external weather, dust, sunlight, etc., corrosion resistance, weather resistance and durability of the threaded portion A can be sufficiently obtained.
  • the self-bonding type silicone-based member 40 is a self-bonding type, and since it is cured before being wound, it does not exhibit sticky viscosity. Furthermore, by cutting the wound self-bonding type silicone-based member 40 with a cutter or the like along the longitudinal direction of the threaded portion A, it can be easily removed after construction if necessary.
  • the sealing tape used in the present embodiment is a sealing tape made of a non-silicone material.
  • PTFE polytetrafluoroethylene
  • the sealing tape of the present embodiment is preferably a sealing tetrafluoride ethylene resin unbaked tape (green tape) defined in JIS K 6885: 2005.
  • the international rubber hardness (IRHD hardness) of the self-bonding type silicone-based member is preferably 10 to 50, more preferably 20 to 45, and still more preferably 30 to 40.
  • a mechanical strength will increase that it is more than the lower limit of the said range, and the adhesiveness with respect to a threading part will improve that it is less than the upper limit of the said range.
  • IRHD hardness is defined by JIS K 6253 "Vulcanized rubber and thermoplastic rubber-Determination of hardness-Part 2: International rubber hardness (10 IRHD to 100 IRHD)" , M, values measured using a plunger having a tip ball diameter of ⁇ 0.395 mm.
  • the durometer hardness (A) of the self-bonding type silicone-based member is preferably 10 to 50, more preferably 15 to 45, and still more preferably 20 to 30.
  • a mechanical strength will increase that it is more than the lower limit of the said range, and the adhesiveness with respect to a threading part will improve that it is less than the upper limit of the said range.
  • the above durometer hardness (A) is determined by using a type A tester according to the method specified in JIS K 6253 "Vulcanized rubber and thermoplastic rubber-Determination of hardness-Part 3: Durometer hardness”. Measured value.
  • the tensile strength (unit: N) of the self-bonding type silicone-based member is preferably 100 N or less, more preferably 50 to 70 N.
  • the tensile strength is 50 to 100 N or less, the self-bonding type silicone based member can be appropriately stretched without being broken when it is wound around the threaded portion, and the structure tends to be more closely attached to the threaded portion.
  • the tensile strength is determined by clamping a test piece (tape 25 mm wide and 1.0 mm thick) between a pair of chucks 30 mm apart from each other using Tensilon, and the tensile speed 500 mm / min, 20 It is the value measured along the longitudinal direction of the tape under the condition of ° C.
  • the above-mentioned Tensilon is a tester calibrated based on JIS B 7721 “Tensile tester / Compression tester-Calibration method and verification method of force measurement system”. Examples of the above-mentioned tensilon include a material testing machine manufactured by A & D Co., Ltd.
  • the tensile elongation rate (unit:%) of a self-fusion-bonding type silicone type member 750% or more is more preferable, and 800% or more is more preferable.
  • the upper limit is not particularly limited, and may be, for example, about 1000% as a guide.
  • the tensile elongation rate is determined by sandwiching a test piece (25 mm wide, 1.0 mm thick tape-like) with a pair of chucks separated by 30 mm each other using the above-mentioned Tensilon, and a tensile speed of 500 mm / min, It is a value measured along the longitudinal direction of the tape under the condition of 20 ° C.
  • the self-bonding type silicone-based member satisfying the above-mentioned physical properties, in particular the hardness, is excellent in adhesion, durability and handleability, and further, is excellent in durability at the time of submersion, so it is wound around a metal pipe connection It is very useful as a corrosion resistant structural member.
  • Self-fusion-type silicone-based member having the above hardness, tensile strength and tensile elongation by appropriately adjusting the kind and blending amount of diorganopolysiloxane and boric acid compound constituting the self-fusion-type silicone-based member Is obtained.
  • the self-bonding type silicone-based member as the corrosion-resistant structural member is preferably transparent. By being transparent, it is possible to see through the wound self-bonding type silicone based member and observe the state of the connection inside the corrosion resistant structure. Since the appearance of the connection can be observed without removing the corrosion resistant structure, the necessity of maintenance of the piping including the connection can be easily examined.
  • a fourth aspect of the present invention is an anti-corrosion method in which a tape-like self-bonding type silicone-based member is spirally wound around a connection portion of a metal pipe.
  • the international rubber hardness (IRHD hardness) defined by JIS K 6253 of the self-bonding type silicone-based member is preferably 10 to 50. Further, it is more preferable to satisfy the other physical properties described above.
  • the ratio (W2 / W1) of the width W1 before winding of the self-fusion bonding silicone member to the width W2 after winding is preferably 0.5 to 0.8. By winding so as to be 7, it becomes easier to form an excellent corrosion resistant structure.
  • the ratio is 0.5 or more, it is possible to spirally wind the connecting portion while suppressing the breakage of the self-bonding type silicone-based member.
  • the ratio is 0.8 or less, the stretchability and elasticity of the self-bonding type silicone-based member are easily utilized, and the self-bonding-type silicone-based member is spirally wound around the connecting portion while being stretched. By doing this, the adhesion can be further improved.
  • the length (W2 / W1) of the above-mentioned ratio (W2 / W1) is 0.5 or less, where L1 is the length of the region in which the thread groove of the threaded portion is formed when viewed in the longitudinal direction Let L2 be the length of the area wound so as to be 0.8.
  • the ratio of both lengths (L2 / L1) is preferably 2 to 6, and more preferably 3 to 5. That is, it is most preferable to wind the self-bonding type silicone-based member in a suitable range of the above ratio (W2 / W1) in a region longer than the total length of the threaded portion over the entire length of the threaded portion.
  • Example 1-1 First, a self-adhesive silicone rubber tape (Shin-Etsu Polymer, 20 mm wide, Williams plasticity 200) manufactured by Shin-Etsu Polymer Co., Ltd., as a first silicone-based member, is used for a metal-exposed threaded section of a polyethylene-coated steel pipe ( ⁇ 24.7 mm). It was helically wound to cover the thread as shown in FIG. Subsequently, a self-bonding type silicone rubber tape (manufactured by Shin-Etsu Polymer Co., Ltd., width 25 mm) as a second silicone-based member is overlapped on the first silicone-based member and spirally wound, as shown in FIG. Was coated.
  • a self-adhesive silicone rubber tape Shin-Etsu Polymer, 20 mm wide, Williams plasticity 200 manufactured by Shin-Etsu Polymer Co., Ltd.
  • a corrosion resistant structure was formed at the threaded portion of the steel pipe.
  • Three similar specimens were made. With respect to the above corrosion resistant structure, in a salt spray test in accordance with JIS Z 2371, 1000 hours after the start of the test, the presence or absence of a change in the corrosion resistant structure was visually confirmed. As a result of the confirmation, there was no particular change except that a small amount of salt was deposited on the surface of the silicone-based member forming the corrosion resistant structure, and peeling did not occur in any of the three test bodies. Next, it was cut with a cutter to remove the corrosion resistant structure, and the metal thread was exposed to confirm visually. As a result, no rust was generated in any of the three test bodies. From the above results, it is clear that the corrosion resistant structure of Example 1-1 is excellent in corrosion resistance, weather resistance and durability.
  • Embodiment 1-2 A corrosion resistant structure was formed in the same manner as in Example 1-1 except that the first silicone-based member and the second silicone-based member in Example 1-1 were replaced, and a salt spray test was performed. That is, the same procedure was performed as in Example 1-1 except that a self-bonding type silicone rubber tape was used as the first silicone-based member and a self-adhesive silicone rubber tape was used as the second silicone-based member. As a result, a small amount of salt was deposited on the surface of the corrosion resistant structure. Next, it was cut with a cutter to remove the corrosion resistant structure, and the metal thread was exposed to confirm visually, but it was slightly rusted. From the above results, it was found that the corrosion resistance structure of Example 1-2 was inferior to that of Example 1-1 in some cases, but the corrosion resistance, the weather resistance and the durability were generally good.
  • Embodiment 1-3 A self-adhesive silicone rubber tape (Shin-Etsu Polymer, 25 mm wide, with a degree of plasticity of 100) was spirally wound on the same threaded portion of the same polyethylene-coated steel pipe as in Example 1-1, and then the threaded portion as shown in FIG. Was coated. Thus, a corrosion resistant structure was formed at the threaded portion of the steel pipe. Three similar specimens were made. A salt spray test was conducted on the above-described corrosion resistant structure in the same manner as in Example 1-1. As a result, a small amount of salt was deposited on the surface of the silicone-based member forming the corrosion resistant structure.
  • Example 1-3 was inferior to that of Example 1-1, the corrosion resistance, the weather resistance, and the durability were generally good.
  • Comparative Example 1 A salt spray test was conducted in the same manner as in Example 1-1 in a state in which the metal threaded portion was exposed without forming the corrosion resistant structure in the same threaded portion of the polyethylene-coated steel pipe as in Example 1-1. As a result, rust was generated on more parts than in Examples 1-2 and 1-3 of the metal threaded portion.
  • Embodiment 2-2 First, a sealing tape (width 20 mm) conforming to the JIS standard is spirally wound on a threaded portion of a polyethylene-coated steel pipe ( ⁇ 24.7 mm) where metal is exposed, and the threaded portion is covered as shown in FIG. did. Subsequently, the same self-fusion type silicone rubber tape (Shin-Etsu Polymer Co., Ltd., width 25 mm) as a silicone-based member is overlapped on the seal tape and spirally wound to cover the threaded portion as shown in FIG. did. Thus, a corrosion resistant structure was formed at the threaded portion of the steel pipe. Three similar specimens were made.
  • Example 2-2 With respect to the above corrosion resistant structure, in a salt spray test in accordance with JIS Z 2371, 1000 hours after the start of the test, the presence or absence of a change in the corrosion resistant structure was visually confirmed. As a result, there was no particular change except that a small amount of salt was deposited on the surface of the self-bonding type silicone-based member forming the corrosion resistant structure, and peeling did not occur in any of the three test bodies. Next, it was cut with a cutter to remove the corrosion resistant structure, and the metal thread was exposed to confirm visually. As a result, no rust was generated in any of the three test bodies. From the above results, the evaluation of the corrosion resistance, weatherability and durability of the corrosion resistant structure of Example 2-2 was good as in Example 2-1.
  • Example 2-3 A corrosion resistant structure was formed in the same manner as in Example 2-1 except that the self-bonding type silicone rubber tape was changed to the following, and a salt spray test was performed. As a result, the same good results as in Example 2-1 were obtained.
  • Example 2-4 A corrosion resistant structure was formed in the same manner as in Example 2-2 except that the self-bonding type silicone rubber tape was changed to the one used in Example 2-3, and a salt spray test was conducted. As a result, the same good results as in Example 2-2 were obtained.
  • Example 2-5 A corrosion resistant structure was formed in the same manner as in Example 2-1 except that the self-bonding type silicone rubber tape was changed to the following, and a salt spray test was performed. As a result, unlike in Example 2-1, partial loosening and peeling occurred in one of the three test bodies. When it cut off with a cutter and removed anticorrosion structure and exposed the metal thread part and it checked visually, in one of three test bodies, a little rust had arisen.
  • the physical property values measured by the above-mentioned method are as follows about the self-bonding silicone rubber tape (Shin-Etsu Polymer Co., Ltd. make, water leak management) used here.
  • Example 2-5 has corrosion resistance, weatherability, and durability, but is inferior to Examples 2-1 to 2-4.
  • Comparative Example 2-1 A salt spray test was carried out in the same manner as in Example 2-1, in a state in which the anticorrosion structure was not formed in the same threaded portion of the polyethylene-coated steel pipe as in Example 2-1, and the thread portion was exposed. As a result, in any of the three test bodies, rust occurred in a wide range of the metal threaded portion.
  • Comparative Example 2-2 The seal tape was spirally wound on the same threaded portion of the same polyethylene-coated steel pipe as in Example 2-1 to cover the threaded portion as shown in FIG. Subsequently, another sealing tape was spirally wound on the previously wound sealing tape to cover the threaded portion as shown in FIG. Three similar specimens were made. A salt spray test was conducted on the above-mentioned test specimens in the same manner as in Example 2-1. As a result, a small amount of salt was deposited on the surface of the test body, and peeling occurred in a part of the spirally wound sealing tape in three of the three test bodies. Next, the seal tape was removed by cutting with a cutter, and the metal thread portion was exposed and visually confirmed. In three of the three test specimens, rust was observed. From the above, the structure in which the sealing tape of Comparative Example 2-2 was doubly wound was inferior in the corrosion resistance, the weather resistance and the durability to those of Examples 2-1 to 2-5.
  • the corrosion resistant structure of the present invention can prevent water and oxygen causing corrosion from coming into contact with the connection portion of the metal pipe.
  • Metal pipe having male thread Metal pipe having female thread A Threaded portion 11 Groove 30 constituting threaded portion A First member wound on the threaded portion 40 Threaded portion overlapped on the second portion Member 50 support film 60 sheet-like self-adhesive silicone member 70 intermediate

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Protection Of Pipes Against Damage, Friction, And Corrosion (AREA)
  • Laminated Bodies (AREA)

Abstract

Une structure anticorrosion comprend des tuyaux métalliques et un élément à base de silicone auto-adhésif ou un élément à base de silicone auto-fusible qui est enroulé autour d'une partie de connexion des tuyaux métalliques.
PCT/JP2018/026580 2017-07-14 2018-07-13 Structure anticorrosion et procédé de construction anticorrosion, et élément pour structure anticorrosion Ceased WO2019013340A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2017-138288 2017-07-14
JP2017-138287 2017-07-14
JP2017138287A JP6983561B2 (ja) 2017-07-14 2017-07-14 防腐食構造
JP2017138288A JP2019019883A (ja) 2017-07-14 2017-07-14 防腐食構造及び防腐食工法、並びに防腐食構造用部材

Publications (1)

Publication Number Publication Date
WO2019013340A1 true WO2019013340A1 (fr) 2019-01-17

Family

ID=65001931

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2018/026580 Ceased WO2019013340A1 (fr) 2017-07-14 2018-07-13 Structure anticorrosion et procédé de construction anticorrosion, et élément pour structure anticorrosion

Country Status (1)

Country Link
WO (1) WO2019013340A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2020143761A (ja) * 2019-03-08 2020-09-10 東日本電信電話株式会社 引き上げ管の腐食部の補修方法
JP2021017966A (ja) * 2019-07-23 2021-02-15 信越ポリマー株式会社 ナットの緩み防止構造、及びその形成方法

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5147067A (ja) * 1974-10-22 1976-04-22 Nippon Kokan Kk Boshokuhifukukokanno tsugitebuboshokuhoho
JPS56150694A (en) * 1980-04-25 1981-11-21 Nippon Kokan Kk Corrosionproofing method of joining part of plastic coated steel pipe
JPS59171293U (ja) * 1983-04-30 1984-11-15 株式会社コ−メイ 防食層保護被覆
JPH0686221U (ja) * 1993-05-24 1994-12-13 住友電装株式会社 電線の防水構造
JPH1194190A (ja) * 1997-09-25 1999-04-09 Shin Etsu Polymer Co Ltd 配管構造及び管継手のシーリング方法
JP2001099390A (ja) * 1999-10-01 2001-04-10 Kubota Corp 管継手部防蝕構造
JP2005344779A (ja) * 2004-06-01 2005-12-15 Shin Etsu Polymer Co Ltd 管継手
JP2006275177A (ja) * 2005-03-29 2006-10-12 Osaka Gas Co Ltd 配管接続部の防食方法
JP2012162082A (ja) * 2007-03-07 2012-08-30 Saint-Gobain Performance Plastics Corp シリコーン組成物を含有する物品およびそれらの製造方法
JP2014210851A (ja) * 2013-04-18 2014-11-13 信越化学工業株式会社 付加硬化型自己接着性シリコーンゴム組成物及び成形品
JP2016114180A (ja) * 2014-12-16 2016-06-23 信越ポリマー株式会社 配管漏洩補修用テープ

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5147067A (ja) * 1974-10-22 1976-04-22 Nippon Kokan Kk Boshokuhifukukokanno tsugitebuboshokuhoho
JPS56150694A (en) * 1980-04-25 1981-11-21 Nippon Kokan Kk Corrosionproofing method of joining part of plastic coated steel pipe
JPS59171293U (ja) * 1983-04-30 1984-11-15 株式会社コ−メイ 防食層保護被覆
JPH0686221U (ja) * 1993-05-24 1994-12-13 住友電装株式会社 電線の防水構造
JPH1194190A (ja) * 1997-09-25 1999-04-09 Shin Etsu Polymer Co Ltd 配管構造及び管継手のシーリング方法
JP2001099390A (ja) * 1999-10-01 2001-04-10 Kubota Corp 管継手部防蝕構造
JP2005344779A (ja) * 2004-06-01 2005-12-15 Shin Etsu Polymer Co Ltd 管継手
JP2006275177A (ja) * 2005-03-29 2006-10-12 Osaka Gas Co Ltd 配管接続部の防食方法
JP2012162082A (ja) * 2007-03-07 2012-08-30 Saint-Gobain Performance Plastics Corp シリコーン組成物を含有する物品およびそれらの製造方法
JP2014210851A (ja) * 2013-04-18 2014-11-13 信越化学工業株式会社 付加硬化型自己接着性シリコーンゴム組成物及び成形品
JP2016114180A (ja) * 2014-12-16 2016-06-23 信越ポリマー株式会社 配管漏洩補修用テープ

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2020143761A (ja) * 2019-03-08 2020-09-10 東日本電信電話株式会社 引き上げ管の腐食部の補修方法
JP2021017966A (ja) * 2019-07-23 2021-02-15 信越ポリマー株式会社 ナットの緩み防止構造、及びその形成方法

Similar Documents

Publication Publication Date Title
JP6338284B2 (ja) 配管漏洩補修用テープ
US10647095B2 (en) Surface treatment for tape adhesion and ultraviolet stability
JP6983561B2 (ja) 防腐食構造
US11846383B2 (en) Anti-corrosive wrapping for metal pipes and metal pipe fittings
WO2019013340A1 (fr) Structure anticorrosion et procédé de construction anticorrosion, et élément pour structure anticorrosion
JP2010215825A (ja) 粘着テープ
JP2014505766A (ja) 機械的及び防食保護用ビニルテープ
CN101891924A (zh) 防止成型物品被腐蚀的组合物
RU2645946C2 (ru) Способ защиты от коррозии сваренной части облицованной пластмассой стальной трубы и фиксирующая лента с чувствительным к давлению клейким веществом для предотвращающего коррозию термоусадочного листа
WO2023116465A1 (fr) Adhésif anticorrosion élastique, ruban adhésif anticorrosion élastique et procédé de préparation associé
JP7188925B2 (ja) 粘着テープ
US20200277516A1 (en) Self-fusing silicone tape compositions having corrosion inhibitors therein
JP2019019883A (ja) 防腐食構造及び防腐食工法、並びに防腐食構造用部材
JPH09230873A (ja) 制振構造体及び制振用ゴム組成物
RU2199051C1 (ru) Антикоррозионная изоляционная лента
RU10830U1 (ru) Антикоррозионная изоляционная лента
KR102652029B1 (ko) 보일러 연통 기밀용 자기융착 내열 실리콘테이프
JP2021081009A (ja) 配管接続構造及び配管接続工法、並びにシリコーンテープ
JPS6219638B2 (fr)
JP3591122B2 (ja) 耐熱酸化劣化性、耐低温脆化性および耐水二次密着性に優れたポリプロピレン被覆鋼管
JP7407632B2 (ja) 線材束及びその製造方法、並びに配線構造及びその製造方法
TW201908439A (zh) 防腐蝕膠帶
JP2024164925A (ja) 配管補修用テープ及び配管補修方法
JPH0642871U (ja) 電線、ケーブル等の巻取用ドラム
JP2023150340A (ja) 燃料輸送用ホース

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 18831797

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 18831797

Country of ref document: EP

Kind code of ref document: A1