JP2019072856A - Protective sheet set - Google Patents

Abstract

To provide a protective sheet set that easily controls a curing reaction of a compound sheet.SOLUTION: A protective sheet set 20 has a compound sheet 21 for covering a protection object, and a cover sheet 22 for further covering the protection object from outside the compound sheet. The compound sheet 21 has a compound having reaction-curability. The cover sheet 22 is composed of a nonwoven fabric. The nonwoven fabric has a solution for curing the compound supported thereon.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a protective sheet set for protecting an object to be protected, and more particularly, a compound sheet for covering the object to be protected, and a covering sheet for further covering the object to be protected from the outside of the compound sheet. Related to the protective sheet set.

2. Description of the Related Art In the past, anticorrosion compound sheets for protecting metal members such as pipes from corrosion in a plant or the like built on the beach are widely used.
As this type of anticorrosion compound sheet, there is known one in which an anticorrosion compound containing petrolatum as a main component is supported on a substrate sheet.
As the anticorrosion compound sheet, a long belt-like one called anticorrosion tape etc. is widely used after being wound into a roll, and when forming an anticorrosion layer on a pipe to be protected, It is wound and used so that it may become a half wrap to piping.
The anticorrosion tape wound around the pipe is further coated with a covering sheet for the purpose of preventing the anticorrosion compound from falling from the pipe, and a plastic sheet or the like is used as a covering sheet to cover the anticorrosion tape. It is utilized (refer the following patent document 1).

As a protective sheet set provided with a covering sheet such as a plastic sheet and an anticorrosion compound sheet, a metal which is an object to be protected with a reaction curable compound sheet containing an epoxy resin as shown in Patent Document 2 below in recent years It has been considered to form an anticorrosive layer on the surface of the pipe.
The formation of a protective layer for protecting the protection target with a compound having such a reaction curing property is not only in the case of forming an anticorrosive layer as the protective layer, but also in the case of forming a fireproof layer etc. Is also adopted.
With regard to this point, for example, Patent Document 3 below describes that a sheet having a fiber sheet impregnated and supported with a compound having a reaction curability containing an epoxy resin and expanded graphite is used for forming a fireproof layer. It is done.

Unexamined-Japanese-Patent No. 2017-101310 JP 2004-155003 A JP, 2016-151001, A

Forming a protective layer with a compound having reaction curing properties can improve the workability because the compound can be cured in a relatively short time.
However, if the compound to be provided in the compound sheet for covering the protection target has reaction curability, there is a possibility that the curing reaction may proceed before use.
In order to prevent such a thing, it is conceivable to add a curing agent component such as a catalyst for causing a curing reaction in the compound later.
For example, if a compound sheet is wound on the surface of a substance to be protected such as piping and then a solution containing a catalyst etc. is applied to the surface of the compound sheet, etc., the timing to cause the compound to cure can be controlled arbitrarily. .
However, in this case, it is difficult to uniformly apply the solution on the surface of the compound sheet, and there is a risk that the solution may drip down due to gravity, or a portion where curing reaction easily progresses and a portion where it does not occur. .
And there is also a possibility that unpainting may occur, for example in a portion which is hard to do application work, such as a lower part of piping arranged horizontally.
Also, although depending on the viscosity of the solution, etc., there is a limit to the coating thickness of the solution, and the amount of catalyst added per unit area to the compound sheet is limited in the above case. It will be

As such, it is difficult to sufficiently control the curing reaction of a compound when forming a protective layer such as an anticorrosion layer or a fireproof layer by covering a protection target with a compound sheet provided with a compound having a reaction curing property. There's a problem.
An object of this invention is to provide the protective sheet set which is easy to control the curing reaction in a compound sheet in view of the above problems.

  In order to solve the above problems, the inventor of the present invention is a protective sheet set including a compound sheet for covering an object to be protected and a cover sheet for further covering the object to be protected from the outside of the compound sheet, A compound sheet is provided with the compound which has reaction hardening property, the said covering sheet is comprised by the nonwoven fabric, and the said nonwoven fabric provides the protective sheet set by which the liquid agent for hardening the said compound is carry | supported.

According to the present invention, the coating sheet covering the compound sheet is provided with a solution for curing the compound, and the coating sheet is composed of a non-woven fabric, so that the solution has an uneven distribution on the compound sheet. Can be suppressed.
Furthermore, in the present invention, the amount of catalyst or the like added per unit area to the compound sheet can be adjusted by adjusting the basis weight of the non-woven fabric.
Therefore, according to the present invention, a protective sheet set can be provided which is easy to control the curing reaction in the compound sheet.

The partially cutaway cross-sectional view which notched and showed a part of anti-corrosion structure. BRIEF DESCRIPTION OF THE DRAWINGS The schematic perspective view which showed the attachment condition of the protective sheet set at the time of comprising the anti-corrosion structure which concerns on one Embodiment. The partially cutaway cross-sectional view which notched and showed a part of fireproof structure.

The first embodiment of the present invention will be described below.
In the following, the first embodiment of the present invention will be described with reference to an example in which a metal pipe is an object to be protected under an environment in which a metal member such as a plant built along a coast is easily corroded.

(First Embodiment: Anticorrosion Structure)
In the present embodiment, an anticorrosive layer is formed on the metal pipe as a protective layer for suppressing the metal pipe from being damaged by corrosion.
FIG. 1 is a view showing an anticorrosive structure provided with a metal pipe and an anticorrosive layer.
And FIG. 1 is the schematic sectional drawing which simulatedly showed a mode that one part of the anti-corrosion structure 1 was cut | disconnected in the plane containing central-axis AX of the metal pipe 10. As shown in FIG.
The metal pipe 10 is in contact with the outer surface of the metal pipe 10 and is a long strip-like compound sheet for covering the metal pipe 10 from the outside, and further covers the metal pipe 10 from the outside of the compound sheet. A protective sheet set 20 provided with a cover sheet protects the surrounding environment in which corrosion may occur.
That is, in the anticorrosion structure 1 of the present embodiment, the anticorrosion layer is formed on the outer side in the radial direction (DR) of the metal pipe 10.

A strip-shaped compound sheet (hereinafter also referred to as "anticorrosion tape 21") for forming an anticorrosion layer on the surface of the metal pipe 10 includes a compound having reaction curability (hereinafter also referred to as "anticorrosion compound").
The anticorrosion tape 21 is spirally wound around the metal pipe 10 so that the length direction thereof is a direction DW which revolves around the central axis of the metal pipe 10, and the metal pipe 10 is made to be a half wrap. It is wound around.
The covering sheet is brought into contact from the outside with the anticorrosion tape 21 wound around the metal pipe 10 in a half-wrap manner to cause the hardening reaction to cause a hardening reaction in the anticorrosion compound constituting the anticorrosion tape 21 It is in the form of a long band-like non-woven fabric (hereinafter also referred to as "curing tape 22") on which the liquid agent is carried.

  The curing tape 22 in the present embodiment is spirally wound on the anticorrosion tape in the same manner as the anticorrosion tape 21, but the hardening tape 22 is half-wrapped and is double wound. Unlike, it is wound on the anticorrosion tape so as to be as single as possible.

The thickness of the anticorrosion tape 21 of the present embodiment is not particularly limited, but is usually 0.5 mm to 2.0 mm.
The thickness of the curing tape 22 of the present embodiment is not particularly limited, but is usually 0.1 mm to 0.5 mm.
In the anticorrosion layer of the present embodiment, the anticorrosion tape 21 has a double structure, and usually has a thickness of 1.2 to 3 mm.

The anticorrosion tape 21 and the hardening tape 22 may cover the metal pipe 10 in a state called “longitudinal attachment” instead of the above-mentioned half wrap state, and the longitudinal direction is the central axis AX of the metal pipe 10 The metal tube 10 may be covered along the direction, and may be cylindrical so that both ends in the width direction are attracted to each other.
Further, the procedure for covering the metal pipe 10 with the protective sheet set 20 is not particularly limited, and after covering the metal pipe 10 with the anticorrosion tape 21, the anticorrosion tape 21 covering the metal pipe 10 is covered with the curing tape 22. Also, the anticorrosive tape 21 and the curing tape 22 may be stacked in advance to form a laminated sheet with the anticorrosive tape 21 and the curing tape 22 and then the metal pipe 10 may be covered with the laminated sheet.

It is preferable that the said anticorrosion compound with which the anticorrosion tape 21 is provided is a reaction curable composition containing a silicone compound, in order to exhibit the outstanding anticorrosion effect.
The anticorrosion compound is preferably such that its reaction curability is exhibited by the silicone compound, and preferably contains a reaction curable silicone compound.
The anticorrosion tape 21 preferably includes a base sheet for maintaining the anticorrosion compound containing a silicone compound in a sheet state.
The base sheet is porous, impregnated, and water-permeable in that it can easily hold the anticorrosion compound firmly and can spread the effect of the solution carried on the curing tape in the thickness direction of the anticorrosion tape. A rich one is preferable, and a fiber sheet is preferable.

Examples of fibers constituting the fiber sheet include polyethylene resin (PE) fibers, polypropylene resin (PP) fibers, polyvinyl alcohol resin (PVA) fibers, polyethylene terephthalate resin (PET) fibers, polyamide resin (PA) fibers, and rayon Fiber, cellulose fiber etc. are mentioned.
Specifically, non-woven fabrics such as polyester non-woven fabrics and polyamide non-woven fabrics are preferable as the fiber sheet.
As the non-woven fabric, for example, a polyester non-woven fabric or a polyamide non-woven fabric having a thickness of 0.4 mm or more and 1.0 mm or less and a mass per unit area of 50 g / m ² or more and 200 g / m ² or less can be adopted.

As the non-woven fabric, those manufactured by various methods such as spun bond, chemical bond, needle punch and stitch bond can be adopted.
Among them, a spunlace non-woven fabric in which fibers are oriented such that the flow direction of the fibers is the longitudinal direction of the base sheet is preferable in that the strength in the longitudinal direction of the base sheet can be made excellent.

The anticorrosion tape 21 according to this embodiment is unlikely to be cracked due to ultraviolet degradation even when used outdoors, and the anticorrosion compound may be formed in that a robust protective layer can be formed on a metal pipe. However, it is preferable to contain as a main component a silicone compound provided with a reactive group for causing a curing reaction and an inorganic filler.
As the inorganic filler to be contained in the anticorrosion compound, inorganic hydroxide particles such as aluminum hydroxide particles and magnesium hydroxide particles having an average particle diameter of 1 μm to 15 μm are preferable, and the average particle diameter is 5 μm to 10 μm Aluminum hydroxide particles having a size of about are more preferred.
In addition, the average particle diameter in the said inorganic filler etc. can be calculated | required as a median diameter (D50) in the laser diffraction scattering method, for example.
As an inorganic filler which can be contained in the above-mentioned anticorrosion compound besides these, calcium carbonate particles, clay particles, talc particles etc. are mentioned, for example.
The inorganic filler other than these inorganic hydroxide particles preferably has an average particle diameter (median diameter) of 0.1 μm to 10 μm.
Above all, it is more preferable to contain calcium carbonate particles having an average particle size of 1 μm to 5 μm.
The anticorrosion compound may further contain inorganic hollow particles such as a glass balloon.
The inorganic hollow particles are effective in reducing the weight of the anticorrosive layer.
The average particle size of the inorganic hollow particles is preferably 10 μm or more and 500 μm or less.

The silicone compound constituting the anticorrosion compound together with the inorganic filler is preferably a substance that cures by a condensation reaction in that a good curing reaction is exhibited even at normal temperature (for example, 23 ° C.), and silanol as the reactive group It is preferable to have either a group or an alkoxysilyl group which becomes a silanol group by hydrolysis.
Specifically, the silicone compound is preferably a silicone oil having a chain or branched structure having a plurality of hydroxyl groups in the molecule, and a chain silicone oil having hydroxyl groups at both ends such as polydimethylsiloxane diol. Is particularly preferred.
The silicone oil preferably has a kinematic viscosity at 25 ° C. of 1000 mm ² / s or more and 5000 mm ² / s or less measured by JIS K 2283 "Crude oil and petroleum products-kinematic viscosity test method and viscosity index calculation method".
The silicone oil and the inorganic filler are preferably contained in the anticorrosion compound such that the mass ratio is 20:80 to 40:60 ((silicone oil) :( inorganic filler)).
The total mass of the silicone oil and the inorganic filler is preferably 50% by mass or more of the anticorrosion compound, more preferably 80% by mass or more, and particularly preferably 90% by mass or more.

As a component for curing the silicone compound, a common crosslinking agent or catalyst can be adopted.
In the present embodiment, it is preferable that a part or all of the crosslinking agent and the catalyst be contained in the solution of the curing tape 22.

（なお、式中のＲは、同一又は異なる炭素数のアルキル基であり、ｎは１〜１００の整数である） Examples of the crosslinking agent include silicone compounds which are condensed with polydimethylsiloxane diol or the like by dealcoholization, and silicone compounds having one or more alkoxy groups are preferable.
As said crosslinking agent used for bridge | crosslinking of chain | strand-shaped silicone oil, it is preferable to employ | adopt the polyalkoxypolysiloxane represented by following General formula (1).
Among them, ethyl silicate is particularly preferable as the crosslinking agent.

(In the formula, R is an alkyl group having the same or different carbon number, and n is an integer of 1 to 100)

Specific examples of the crosslinking agent further include, for example, methyltrimethoxysilane, methyltriethoxysilane, ethyltrimethoxysilane, ethyltriethoxysilane, butyltrimethoxysilane, butyltriethoxysilane, vinyltrimethoxysilane, and phenyltrimethoxysilane. Trifunctional alkoxysilanes such as methoxysilanes; Tetrafunctional alkoxysilanes such as tetramethoxysilanes, tetraethoxysilanes and tetrapropoxysilanes; Methyltripropenoxysilanes, methyltriacetoxysilanes, vinyltriacetoxysilanes, methyltri (butanoxym) silanes Vinyltri (butanoxim) silane, phenyltri (butanoxim) silane, propyltri (butanoxim) silane, tetra (butanoxim) silane, 3,3,3-trifluoropropyl Li (butanoxim) silane, 3-chloropropyltri (butanoxime) silane, methyltri (propanoxime) silane, methyltri (pentanoxime) silane, methyltri (isopentanoxime) silane, vinyltri (cyclopentanoxim) silane, methyltri (cyclohexano) And the like.
The crosslinker may be an alkylpolysiloxane such as methylpolysiloxane or ethylpolysiloxane.

A silane coupling agent may be employed as the crosslinking agent, and a silane coupling agent having an amino group can be employed as a suitable crosslinking agent.
Examples of the silane coupling agent include N-2- (aminoethyl) -3-aminopropylmethyldimethoxysilane, N-2- (aminoethyl) -3-aminopropyltrimethoxysilane, N-2- (amino Ethyl) -3-aminopropyltriethoxysilane, 3-aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane, 3-triethoxysilyl-N- (1,3-dimethyl-butylidene) propylamine, N-phenyl -3-aminopropyl trimethoxysilane and the like.

  The molar ratio of the alkoxy group (-OR) of the crosslinking agent to the hydroxyl group (-OH) of the silicone oil or the like may be usually 1: 100 to 100: 10 (-OR: -OH), 1 It is preferable to be in the range of 10 to 10: 1.

  The cross-linking agent is preferably contained in an amount of 90% by mass or more on the side of the anticorrosion tape 21 among the anticorrosion tape 21 (anticorrosion compound) and the curing tape 22 (liquid agent), and is contained 95% by mass or more Is more preferable, and it is particularly preferable to contain substantially only the anticorrosion tape side.

Examples of the catalyst for causing a curing reaction in the anticorrosion compound together with the crosslinking agent include those having a catalytic ability to promote dehydration condensation of the silicone compounds or the silicone compound and the crosslinking agent.
The catalyst includes, for example, titanium tetraisopropoxide, titanium tetranormal butoxide, butyl titanate dimer, titanium acetylacetonate, titanium octyrene glycolate, organic titanium compounds such as titanium ethyl acetoacetate; aluminum tris (acetylacetonate) Organoaluminum compounds such as aluminum tris (ethylacetoacetate); zirconium tetra (acetylacetonate), zirconium tributoxyacetylacetonate, zirconium dibutoxy diacetylacetonate, zirconium tetranormal propoxide, zirconium tetraisopropoxide, zirconium tetra Normal butoxide, zirconium acylate, zirconium tributoxystearate, zirconium Organic zirconium compounds such as octoate, zirconyl (2-ethylhexanoate), zirconium (2-ethylhexoate); Organotin compounds such as dibutyltin dioctoate, dibutyltin dilaurate, dibutyltin di (2-ethylhexanoate) Metal salts of organic carboxylic acids such as tin naphthenate, tin oleate, tin butylate, cobalt naphthenate and zinc stearate; amine compounds such as hexylamine and dodecylamine phosphate, and salts thereof; benzyltriethylammonium acetate and the like Quaternary ammonium salts; lower fatty acid salts of alkali metals such as potassium acetate and lithium nitrate; dialkylhydroxylamines such as dimethylhydroxylamine and diethylhydroxylamine; and guanidyl group-containing organic silicon compounds
These may be used alone or in combination of two or more.

  The catalyst is preferably contained in an amount of 90% by mass or more on the side of the curing tape 22 among the anticorrosive tape 21 (anticorrosive compound) and the curing tape 22 (liquid agent), and is contained 95% by mass or more Is more preferable, and it is particularly preferable to be contained substantially only in the curing tape.

In addition to the above, the anticorrosion compound includes functional chemicals such as rust inhibitors, weathering agents, flame retardants, fungicides, fungicides, antibacterial agents, and various additives such as thickeners, tackifiers, and pigments. Can be contained.
In particular, the anticorrosion compound preferably contains a rust inhibitor.
The antirust agent is not particularly limited, but a phosphate antirust agent or ion such as a zinc phosphate antirust agent, an iron phosphate antirust agent, an aluminum phosphate antirust agent, etc. Exchange-type antirust agents are preferred, among which aluminum phosphate antirust agents such as aluminum phosphate (aluminum orthophosphate) and aluminum polyphosphate (aluminum metaphosphate), calcium ion exchange silica, magnesium ion exchange silica, strontium ion exchange It is preferable to use any of ion exchange type anticorrosive agents such as silica, and aluminum polyphosphate is particularly preferable.
Moreover, as said thickener, hydrophilic fumed silica whose specific surface area by BET method is 50-200 m < ² > / g is employable, for example.
Examples of the pigment include white pigments such as zinc oxide and titanium oxide, black pigments such as carbon black, red pigments such as iron oxide (bengara), yellow pigments such as zinc chromate, and iron potassium ferrocyanide. Blue pigments can be employed.

The curing tape 22 for causing the anticorrosion compound to cause a curing reaction includes the non-woven fabric and the liquid agent carried on the non-woven fabric as described above.
The liquid agent can be used as a stock solution if the catalyst is liquid at normal temperature (23 ° C.).
The solution may be, for example, a solution in which the catalyst is a solid or a viscous liquid, which is dissolved in an appropriate organic solvent.

The non-woven fabric constituting the curing tape 22 may be the same as or different from the base sheet of the anticorrosion tape.
The curing tape 22 is preferably in close contact with the anticorrosion tape to form an anticorrosion layer in order to cause the anticorrosion compound to act catalytically.
In that case, it is advantageous that the non-woven fabric is excellent in flexibility.
For these reasons, it is preferable that the non-woven fabric is such that the fibers are not bound by heat fusion or a binding agent (binder), but that the fibers are merely entangled.
Therefore, the non-woven fabric is preferably a spunlace non-woven fabric or the like.

In the spunlace nonwoven fabric, a stripe type in which portions having relatively high fiber density are parallel to one another and portions having relatively low fiber density exist therebetween, or fiber density is relatively high It may be of a mesh type in which the portions are in a honeycomb shape or lattice shape and portions in which the fiber density is relatively low are present.
In the mesh type spunlaced non-woven fabric, through holes may be formed in a portion where the fiber density is relatively low.
Such a mesh-type spunlaced nonwoven fabric is excellent in strength and flexibility because the portion with high fiber density continues vertically and horizontally while having a plurality of through holes.
As a mesh type spunlace nonwoven fabric, one having an average center-to-center distance of adjacent through holes of 1 mm to 5 mm is preferable.
The average center-to-center distance of the through holes can be determined by arithmetically averaging a value obtained by randomly selecting 10 to 20 pairs of two adjacent through holes and measuring the center to center distance.

It is preferable that the nonwoven fabric which comprises the tape 22 for hardening is smaller in fabric weight than the nonwoven fabric etc. which comprise the base material sheet of an anticorrosion tape in the point of being easy to exhibit the outstanding softness | flexibility.
The basis weight of the non-woven fabric constituting the curing tape 22 is preferably 10 g / m ² or more and 100 g / m ² or less, more preferably 20 g / m ² or more and 80 g / m ² or less, and 25 g / m ² or more It is particularly preferable that it is 60 g / m ² or less.

If the amount of the liquid agent carried on the non-woven fabric is too small, it tends to be uneven, and if it is too large, deviation due to gravity may occur or it may take a long time to dry, so 50 g / m ² or more and 500 g / m ² It is preferably ² or less, and more preferably 100 g / m ² or more and 350 g / m ² or less.

When forming an anticorrosive layer on the outer periphery of the metal pipe 10 by the protective sheet set 20 combining the curing tape 22 and the anticorrosive tape 21, the anticorrosive tape 21 is wound around the metal pipe 10 in a half wrap state 1 and 2, about half in the width direction becomes the contact area 21a directly in contact with the metal pipe 10, and the other half is wound on the contact area one round before and does not directly contact the metal pipe 10. It becomes the contact area 21b.
The boundary 21 c between the contact area 21 a and the non-contact area 21 b is in contact with a portion where a step is generated by the tape edge one round before.
Therefore, if the anticorrosion compound does not show plastic deformation of a certain level or more, a gap is likely to be formed between the anticorrosion tape 21 and the metal pipe 10 at this boundary, and sufficient anticorrosion may not be exhibited. .
However, in the anticorrosion compound of this embodiment, since the catalyst etc. can be added later by the curing tape 22, it is suppressed that the hardening reaction proceeds in an unintended form and the plastic deformation of the anticorrosion compound is impaired .
That is, in the present embodiment, for example, the gap between the anticorrosion tape 21 and the metal pipe 10 can be filled by pushing the boundary portion 21c from the outside with a fingertip or the like, and the reliability of the anticorrosion layer is improved. Can.

  In this embodiment, in order to more reliably suppress the formation of a gap between the anticorrosive tape 21 and the metal pipe 10, a paste similar to the anticorrosion compound or a paste obtained by reducing the viscosity of the anticorrosion compound is used. Such a primer may be prepared and applied to the surface of the metal tube 10 before the anticorrosion tape 21 is wound on the metal tube 10.

In the anticorrosion structure of the present embodiment, since the curing tape 22 is a non-woven fabric carrying a liquid agent, the liquid agent can be uniformly spread over the whole by capillary phenomenon, so that generation of uneven curing of the anticorrosion compound can be suppressed. .
When the primer is applied as described above, if necessary, the paste may also contain a catalyst so that the anticorrosion compound is cured by applying a catalytic action from both inside and outside of the anticorrosion tape wound around the metal tube 10.
In the case where the anticorrosive compound is not sufficiently cured by one curing, for example, the solution may be applied again to the nonwoven fabric of the curing tape which has been consumed to become a dried state.
Also in this case, since the liquid agent spreads through the non-woven fabric, it is possible to suppress the occurrence of the bias of the liquid agent.

As described above, in the present embodiment, since the curing reaction of the anticorrosion compound can be easily controlled, the anticorrosion layer having excellent anticorrosion properties can be formed without requiring complicated work.
The curing tape in the present embodiment may be left as it is after the anticorrosion compound is sufficiently cured.
For example, if a curing tape is left when a weather resistant paint or the like must be applied as a top coat, the thickness of the coating can be easily secured by applying the paint from above, and moreover, the paint drips off Can be prevented.

The material of the metal pipe 10 to be protected in the present embodiment is not particularly limited, and magnesium, a magnesium alloy, in addition to general metals such as iron, aluminum and copper and alloys thereof A member made of nickel, a nickel alloy, pure titanium, a titanium alloy or the like can be adopted as a component of the anticorrosion structure of the present embodiment.
In the present embodiment, as a metal member to be protected for the sake of convenience, a pipe member called a metal pipe is exemplified, but the metal member protected by the protective sheet set of the present embodiment is a wire, a plate, a hollow There is no particular limitation on the shape or size of a solid case, a sphere or the like.

Second Embodiment Fireproof Structure
The protective sheet set of the present invention is not effective only when forming an anticorrosive layer on a metal pipe or the like.
Next, as another example different from the first embodiment, the second embodiment will be described taking as an example the case where a protective sheet set is used to form a fireproof layer.
FIG. 3 is a view showing a fireproof structure 1x in which a flexible conduit 10x accommodating the electric wire 11x is a protection target.
The fireproof structure according to the present embodiment includes a long strip-shaped compound sheet (hereinafter also referred to as "fireproof tape 21x") for covering the flexible conduit 10x from the outside in contact with the outer surface of the flexible conduit 10x; The flexible conduit 10x is protected by a protective sheet set 20x provided with a long strip-like covering sheet (hereinafter also referred to as "curing tape 22x") for further covering the metal pipe 10 from the outside of the compound sheet. It is done.

Although the thickness of the fireproof tape 21x of this embodiment is not specifically limited, Usually, they are 0.5 mm-2.0 mm.
The thickness of the curing tape 22x of the present embodiment is not particularly limited, but is usually 0.1 mm to 0.5 mm.
The thickness of the fireproof layer in the present embodiment may be the same as that of the anticorrosion layer.

  The fireproof tape 21x and the hardening tape 22x may form a fireproof layer not only in the half wrap state but also in a state called "longitudinal attachment" as in the first embodiment.

It is preferable that the compound (hereinafter, also referred to as "refractory compound") having reaction curability that constitutes the fireproof tape 21x of the present embodiment is based on a silicone compound as in the first embodiment, and the inorganic filler etc. The same as the anticorrosion compound may be contained in the same mass proportion.
Specifically, the fire resistant compound contains the silicone oil and the inorganic filler in a mass ratio of 20:80 to 40:60 ((silicone oil) :( inorganic filler)). preferable.
The total mass of the silicone oil and the inorganic filler is preferably 50% by mass or more of the refractory compound, more preferably 80% by mass or more, and particularly preferably 90% by mass or more.

Among the inorganic fillers, the inorganic hydroxide filler functions as a flame retardant because it is thermally decomposed and dehydrated.
Therefore, it is not preferable to include an inorganic filler other than the inorganic hydroxide filler in an excessive proportion in the refractory compound in consideration of the flame retardancy of the formed refractory layer.
The mass ratio of the inorganic filler other than the inorganic hydroxide filler to 100 parts by mass of the inorganic hydroxide filler in the refractory compound is 50 parts by mass or less when priority is given to exerting excellent flame retardancy with respect to the refractory layer. The content is preferably 25 parts by mass or less, more preferably 10 parts by mass or less, and particularly preferably 5 parts by mass or less.
It is particularly preferred that the refractory compound does not contain inorganic fillers other than inorganic hydroxide fillers.

On the other hand, not only there may be a possibility that only the excessive flame retardancy will be exhibited even if all the inorganic fillers necessary for causing the refractory compound to exhibit appropriate viscosity as inorganic hydroxide fillers, but also fire resistance When the compound contains only one type of inorganic filler, it may be difficult to exhibit excellent spreadability in the refractory compound.
For example, when all the inorganic fillers contained in the refractory compound are aluminum hydroxide particles having an average particle diameter of 5 μm to 10 μm, the refractory compound is likely to crack on the surface when it is deformed.
For this reason, in consideration of the balance between flame retardancy and spreadability, the refractory compound has another inorganic filler having an average particle diameter smaller than that of the aluminum hydroxide particles in an amount of 200 parts by mass or more based on 100 parts by mass of the aluminum hydroxide particles. It is preferable to contain by the mass ratio of 600 mass parts or less.
More specifically, in the refractory compound, an inorganic filler other than an inorganic hydroxide filler such as calcium carbonate particles having an average particle diameter of 1 μm to 5 μm is 300 parts by mass with respect to 100 parts by mass of aluminum hydroxide particles. It is preferable to contain in the mass ratio of part to 500 parts by mass.

  When the flexible conduit 10x is made of a synthetic resin and is made of a synthetic resin and is flammable, the fireproof compound is a pyrolyzable foaming agent or a thermally expandable inorganic material so as to exhibit high thermal insulation at the time of flame contact. You may contain a filler etc.

Examples of the foaming agent include an azo compound-containing foaming agent, a nitroso compound-containing foaming agent, a sulfonyl / hydrazide-containing foaming agent, and a bicarbonate-containing foaming agent.
Moreover, sodium bicarbonate, p-toluene sulfonyl semicarbazide, a microencapsulated foaming agent etc. are mentioned as said foaming agent.

  The content of the foaming agent in the refractory compound when the content of the silicone compound is 100 parts by mass can be, for example, 0.1 parts by mass or more and 20 parts by mass or less, and 1 parts by mass or more and 10 parts by mass or less Is preferred.

In the present embodiment, a foaming aid can also be used in combination.
Examples of the foaming aid include organic amines, di-n-butylamine, aluminum sulfate, diethanolamine, urea, urea compounds, salicylic acid, phthalic anhydride, benzoic acid and diethylene glycol.

  The mass ratio of the foaming aid to 100 parts by mass of the silicone compound can be, for example, 0.01 parts by mass or more and 10 parts by mass or less.

Examples of the thermally expandable inorganic filler include vermiculite and thermally expandable graphite.
Among them, thermally expandable graphite is suitable as a thermally expandable inorganic filler.

The refractory compound may contain an oil other than silicone oil.
However, while silicone oil is effective in forming a coating with excellent fire resistance and vitrification that is difficult to burn even when exposed to a flame, it is generally combustible with oils other than silicone oil. It will be exhibited.
Therefore, in order to exhibit excellent fire resistance, the mass ratio of the silicone oil is preferably 90% by mass or more when the total mass of all the oils contained in the refractory compound is 100% by mass, 95 It is more preferable that it is mass% or more, It is more preferable that it is 98 mass% or more, It is especially preferable that it is 99 mass% or more.
It is particularly preferred that the fire resistant compound does not contain any oil other than silicone oil.

The fire resistant compound may contain a common flame retardant for the purpose of further improving the flame retardancy.
Examples of the flame retardant include phosphorus-based flame retardants such as ammonium polyphosphate and red phosphorus, and halogen-based flame retardants such as decabromodiphenyl-based compounds.
However, since these also cause generation of phosphine gas and hydrogen halide when the fireproof layer is exposed to flames, it is preferable not to excessively contain them in the fireproof compound of the present embodiment.

More specifically, the content of the phosphorus-based flame retardant in the refractory compound is preferably 1% by mass or less, and more preferably 0.5% by mass or less.
It is particularly preferred that the fire resistant compound does not contain a phosphorous flame retardant.
The content of the halogen-based flame retardant in the refractory compound is preferably 1% by mass or less, and more preferably 0.5% by mass or less.
It is particularly preferred that the fire resistant compound does not contain a halogen-based flame retardant.

In the protective sheet set 20x of the present embodiment, one or preferably both of the base sheet used to support the refractory compound on the fireproof tape 21x and the non-woven fabric constituting the curing tape 22x are preferably flame retardant. It is preferable that it is comprised with the fiber excellent in the property.
The base sheet of the fire resistant tape 21 x may be an inorganic fiber such as metal fiber, rock wool, glass fiber, etc., but is preferably an organic fiber in order to exhibit excellent flexibility of the fire resistant tape.
Among the organic fibers, polyacrylonitrile-based flameproofed fibers are preferred.
As a polyacrylonitrile-based flame-resistant fiber, for example, a nitrile group is closed by heating a polyacrylonitrile fiber to a temperature of about 200 ° C. to 350 ° C. in an oxidizing atmosphere, and an oxygen atom is taken in the polymer to achieve high temperature It is preferable to use a material which has been subjected to a flameproofing treatment so as to be in a stable state even under the condition.
The base sheet is preferably a woven or non-woven fabric made of polyacrylonitrile-based flame-resistant fiber.

The base sheet constituting the fire resistant tape preferably has a thickness of 0.1 mm or more and 1.0 mm or less, and a mass (weight per unit area) per unit area of 25 g / m ² or more and 200 g / m ² or less, for example. More preferably, it is 40 g / m ² or more and 100 g / m ² or less.
On the other hand, it is preferable that the nonwoven fabric which comprises the said tape 22x for hardening is a spunlace nonwoven fabric etc. similarly to 1st Embodiment, and it is more preferable that it is a spunlace nonwoven fabric made from a polyacrylonitrile-type flameproof fiber.
The spun lace nonwoven fabric may be a stripe type or a mesh type, as in the first embodiment.
The basis weight of the non-woven fabric constituting the curing tape 22x is preferably 10 g / m ² or more and 100 g / m ² or less, more preferably 20 g / m ² or more and 80 g / m ² or less, and 25 g / m ² or more It is particularly preferable that it is 60 g / m ² or less.

In the present embodiment, the flexible conduit 10x is included in the protection target.
The flexible conduit 10x is a corrugated tube in which the irregularities of the tube wall are alternately repeated in the direction of the central axis AX, and the plurality of recesses 101x and the plurality of projections 102x are individually ring-shaped. Either a ring corrugated pipe or a spiral corrugated pipe provided so as to advance along the central axis AX while rotating around the central axis.
In the present embodiment, since the curing tape 22x is configured using the above-described spunlace non-woven fabric, it exhibits good stretchability and good followability to the irregularities of the corrugated tube, and is corrugated first. It shows good adhesion to the outer surface of the fire resistant tape 21x wound around the tube.
Therefore, it can be suppressed that the fireproof tape 21x has a gap with the curing tape 22x and the curing becomes insufficient.
And since the tape 22x for hardening is a nonwoven fabric which carry | supported the liquid agent like the anti-corrosion structure also with the fireproof structure of this embodiment, the said liquid agent spreads uniformly by the capillary phenomenon and hardening unevenness of a fireproof compound occurs. Can be suppressed.
As described above, also in the second embodiment, since the curing reaction of the refractory compound can be easily controlled, the refractory layer excellent in fire resistance can be formed without requiring complicated labor.

In the case of the fireproof structure of the present embodiment, when the fireproof compound is not sufficiently cured by one curing, the same may be said as the anticorrosion structure in that the liquid agent may be applied to the nonwoven fabric of the curing tape multiple times.
Moreover, it is the same as the anticorrosion structure in that the used curing tape may be used as it is.
Furthermore, in the present embodiment, although the flexible conduit containing the electric wire is a protection target, the protection target in the present embodiment is not particularly limited to the material and the like.

In the first and second embodiments, although silicone compounds having a silanol group or an alkoxysilyl group are mainly illustrated as silicone compounds, silicone compounds are not limited to the above-mentioned ones. .
Furthermore, although the thing which has a silicone compound as a main component as a compound which has reaction curability in 1st Embodiment and 2nd Embodiment is illustrated, the said compound is an epoxy resin, an acrylic resin, unsaturated polyester resin And polyurethane resin etc. may be used as the main component.
That is, the present invention is not at all limited to the above examples.

  EXAMPLES The present invention will next be described in more detail by way of examples, which should not be construed as limiting the invention thereto.

<Preparation of refractory tape>
A nonwoven fabric made of polyacrylonitrile-based flame-resistant fiber having a basis weight of 70 g / m ² was prepared as a base sheet.
Linear silicone oil (polydimethylsiloxane diol) having hydroxyl groups at both ends, calcium carbonate particles having an average particle diameter of about 2 μm, aluminum hydroxide particles having an average particle diameter of about 8 μm, and a crosslinking agent (polyalkoxysiloxane) A fire resistant compound having a reaction curing property was prepared (silicone oil: inorganic filler ≒ 3: 7 (calcium carbonate particles: aluminum hydroxide particles ≒ 4: 1)).
A fire resistant tape having a width of 100 mm was produced by stacking two sheets of the base material sheet impregnated with the fire resistant compound.

<Preparation of Curing Tape>
A curing tape was prepared by impregnating and supporting dibutyltin dilaurate as a solution for curing the fire resistant compound on six types of non-woven fabrics shown in the following table.
The basis weight (g / m ² ) of the non-woven fabric before the impregnation with dibutyltin dilaurate and the loading amount of dibutyltin dilaurate per unit area (loading amount of catalyst: g / m ² ) were as shown in the table.

<Preparation of a test body>
The refractory tape was wound around the outer circumference of the corrugated tube with half wrap.
As the corrugated pipe, a corrugated pipe having an inner diameter of 66 mm in the concave portion, an outer diameter of 85 mm in the convex portion, and a distance (pitch) of 21 mm between adjacent convex portions adjacent to each other was used.
In the state which wound the fireproof tape, the unevenness | corrugation corresponding to the shape of the corrugated pipe had arisen on the outer peripheral surface of the fireproof tape.
A curing tape was further wound around the outside to prepare a test body.
In addition, the size of the tape for hardening set it as width 100 mm x length 300 mm, and the test body wound and produced the tape for hardening 1 round from the outer side of the fireproof tape wound around the corrugated pipe.

<Evaluation>
(1) Followability The followability of the curing tape to the surface of the fire resistant tape was determined according to the following criteria.
(Judgment criteria)
A: It showed excellent followability.
B: The followability was good, but slight wrinkles were observed.
C: The followability was good but clear wrinkles were observed.
D: The followability was not sufficient and an air gap was generated between the refractory tape.
(2) Surface Desicability The degree of dryness of the outer surface of the curing tape was determined on the basis of the following criteria at 24 hours after the preparation of the test body.
(Evaluation criteria: dryness by finger touch with finger tip)
A: The liquid agent did not adhere to the finger tip and was in a sufficiently dried state.
B: The solution was thinly attached to a part of the finger, and the drying was slightly insufficient.
C: The solution was adhered to the entire finger tip, and the drying was apparently insufficient.
(3) Compound Hardening Properties After preparation of the test body, the progress of the curing reaction of the fire resistant tape at the contact interface with the corrugated pipe was judged on the basis of the following criteria when 24 hours elapsed.
(Judgment criteria)
A: It was hardened to the state of exfoliating at the interface between the corrugated pipe and the refractory layer, and excellent curability was exhibited.
B: A part of the compound adhered to the corrugated tube, and the curing reaction did not proceed sufficiently.

In the case of using non-woven fabrics # 1, # 2 and # 4 as the curing tape, it was considered that the carried amount of dibutyltin dilaurate was excessive, and sufficient drying property was not observed in 24 hours.
In the case of using non-woven fabric # 6 as the curing tape, sufficient drying was not seen in 24 hours without consumption of dibutyltin dilaurate impregnated in the PET non-woven fabric on the outside of the PE film.
Therefore, in these curing tapes, it has been confirmed that it is effective to optimize the supported amount of the catalyst in order to further improve the workability in forming the fireproof layer.
Furthermore, in the case of using non-woven fabric # 6 as the curing tape, a large gap is formed between the fire-resistant tape and the curing tape at a location where the stiffness of the non-woven fabric (composite product) is strong and corresponds to the recess of the corrugated tube. It appears that a sufficient amount of catalyst (solution) for curing the compound was not supplied from the curing tape to the fire resistant tape.
Therefore, when forming a fireproof layer with such a tape for curing on a protection target such as a corrugated tube whose surface is not flat, in order to further improve the workability, a nonwoven fabric more excellent in flexibility is adopted. It was confirmed that it was effective.

  As described above, it can be seen that the present invention can provide a protective sheet set that can easily control the curing reaction in a compound sheet.

  1: Anticorrosion structure, 1x: Fireproof structure, 10: Metal tube, 10x: Flexible conduit, 20, 20x: Protective sheet set, 21: Anticorrosion tape (compound sheet), 21x: Fireproof tape (compound sheet), 22, 22x: Curing tape (coated sheet)

Claims (7)

A protective sheet set comprising a compound sheet for covering an object to be protected and a covering sheet for further covering the object to be protected from the outside of the compound sheet,
The compound sheet is provided with a compound having a reaction curing property,
A protective sheet set in which the covering sheet is composed of a non-woven fabric, and the non-woven fabric carries a liquid agent for curing the compound. The compound contains a silicone compound having a reaction curing property,
The silicone compound has, as a reactive group, either a silanol group or an alkoxysilyl group which becomes a silanol group by hydrolysis,
The protective sheet set according to claim 1, wherein the solution contains a catalyst for dehydrating and condensing the silanol groups. It is used to form a fireproof layer covering the object to be protected,
The compound sheet comprises a substrate sheet carrying the compound,
The protective sheet set according to claim 1 or 2, wherein the base sheet is a fiber sheet, and the fibers constituting the fiber sheet are polyacrylonitrile-based flameproofed fibers.   The protective sheet set according to any one of claims 1 to 3, wherein the non-woven fabric constituting the covering sheet is a non-woven fabric containing polyacrylonitrile-based flameproofed fibers.   The protective sheet set according to claim 1 or 2, which is used to form an anticorrosion layer covering the object to be protected.   The protective sheet set according to any one of claims 1 to 5, wherein the non-woven fabric constituting the covering sheet is a spunlace non-woven fabric.   The protective sheet set according to claim 6, wherein the object to be protected is provided with a corrugated pipe on which the compound sheet is abutted.

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