JP2002119608A - Fireproof structure for penetrating section of fire retarding division of building, and piping material for fire retarding division used to fireproof construction - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fireproof structure for a penetrating section of a fire retarding division of a building, which can totally close the penetrating hole of the fire regarding division at the time of a fire even if the diameter of a synthetic resin pipe being passed in the penetrating hole of the fire retarding division becomes larger, and a piping material for the fire retarding division which is used for the fireproof structure. SOLUTION: The synthetic resin pipe which constitutes one section of the piping in the building is inserted in the penetrating hole provided in the fire retarding division of the building. At the same time, a fireproof thermally expanding material layer, which closes the penetrating hole by expanding by the heat at the time of a fire, is provided between the penetrating hole and the synthetic resin pipe for the fireproof structure for the penetrating section of the fire retarding division of the building. In such a fireproof structure, as the synthetic resin pipe, an orientation pipe which is drawn at least in the pipe peripheral direction, preferably, an orientation pipe formed of a composition containing a polyolefin as the major component, wherein at least one section is crosslinked, and which is drawn at least in the pipe peripheral direction, is used.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fireproof structure for a fireproof compartment penetration of a building and a piping material for the fireproof compartment used in the fireproof structure.

[0002]

2. Description of the Related Art Conventionally, steel pipes lined with resin and metal pipes such as stainless steel and copper are used as building piping materials. In addition, as a pipe made of resin alone, PVC is used.
(Polyvinyl chloride) tubes and cross-linked polyethylene tubes are used.

[0003] However, the conventional piping materials as described above have the following problems. In other words, a steel pipe lined with a resin has to be separated from the steel pipe part and the resin part by a specialist at the time of recovery, and there is a problem in recyclability.

[0004] On the other hand, stainless steel and copper metal pipes have no problem in terms of recyclability, but because they are heavy, the workability of piping is poor, and it is necessary to use structurally solid support materials and the like, which results in cost reduction. There is also a problem. On the other hand,
Resin pipes such as PVC pipes and cross-linked polyethylene pipes are highly flammable and have poor heat resistance. Therefore, in the event of fire, the synthetic resin is burned out by burning or undergoes thermal deformation. A gap is formed. Therefore, there is a problem that heat, flame, smoke, and the like generated on one side of the fire protection compartment cannot be prevented from reaching the other side.

Therefore, in order to solve the problem of fire resistance when a resin tube is used, for example, a compartment penetration measure kit (hereinafter simply referred to as a kit) made of an intumescent fire-resistant material such as "Heat Mel" manufactured by Furukawa Techno Material Co., Ltd. ) Has been put on the market by each company. In addition, the applicant of the present application can easily install the kit from these kits and can reduce the cost of the tape-shaped refractory thermal expansion material (Japanese Patent Application No. 2000-2000).
No. 148079, hereinafter referred to as "fire-resistant thermal expansion tape").

That is, if the kit and the fire-resistant thermal expansion tape are mounted so as to surround the synthetic resin pipe inserted into the through-hole provided in the fire-prevention section, the kit or the fire-resistant heat-expandable tape can be heated by fire. The thermal expansion tape expands, and the expansion pressure closes the through-hole while crushing the synthetic resin tube, thereby preventing fire spread and invasion of smoke from one side of the fire prevention section to the other. However, even in this method, when the outer diameter of the synthetic resin pipe is 150 mm or more, it is not possible to completely crush the synthetic resin pipe in the fire prevention section penetration part at the time of fire. That is, there is a problem that the through hole cannot be completely closed.

[0007]

SUMMARY OF THE INVENTION In view of the foregoing, the present invention has been made to completely fill the through hole of the fire protection compartment in the event of a fire even if the diameter of the synthetic resin pipe inserted into the through hole of the fire protection compartment becomes large. It is an object of the present invention to provide a fireproof structure of a fireproof section penetrating portion of a building that can be closed, and a pipe material for the fireproof section used in the fireproof structure.

[0008]

In order to achieve such an object, a fire-resistant structure of a building fire-prevention section penetration portion according to the first aspect of the present invention (hereinafter referred to as "a fire-resistant structure of claim 1"). The synthetic resin pipe which constitutes a part of the piping in the building is inserted into the through-hole provided in the fire-prevention section of the building, and the heat generated during a fire is between the through-hole and the synthetic resin pipe. In the fire-resistant structure of the building fire-prevention section penetration part provided with the fire-resistant thermal expansion material layer which expands and closes the through-hole, an oriented pipe stretched at least in the pipe circumferential direction is used as the synthetic resin pipe.

According to the second aspect of the present invention, the fire-resistant structure of the building fire-prevention section penetration portion (hereinafter referred to as “the fire-resistant structure of the second aspect”) is the same as the fire-resistant structure of the first aspect. The orientation tube stretched in the direction was formed from a composition containing at least a partly crosslinked polyolefin as a main component.

[0010] The fire-resistant structure (hereinafter, referred to as “fire-resistant structure of claim 3”) of the fireproof compartment penetration part according to the invention according to claim 3 of the present invention is the same as the fire-resistant structure of claim 2, except that Was added with a layered silicate.

According to a fourth aspect of the present invention, there is provided a fire-resistant structure for a penetration part of a building fire-prevention section (hereinafter referred to as “a fire-resistant structure of the fourth aspect”). In the refractory structure, the refractory thermal expansion material layer is formed by winding a refractory thermal expansion sheet around a synthetic resin tube.

According to a fifth aspect of the present invention, there is provided a fire-resistant structure of a building fire-prevention section penetrating portion (hereinafter referred to as “a fire-resistant structure of the fifth aspect”). In the refractory structure, the mortar is filled in the gap between the refractory thermal expansion material layer and the through hole.

[0013] The pipe material for a fire-resistant structure according to the invention of claim 6 of the present invention (hereinafter referred to as "pipe material of claim 6") is a synthetic resin comprising an oriented pipe stretched at least in the pipe circumferential direction. The pipe is provided so as to surround the entire circumference of at least a portion of the synthetic resin pipe inserted into the through hole provided in the fire protection section of the building, and expands due to heat at the time of fire to crush the synthetic resin pipe. And a refractory thermal expansion material layer that closes the through hole.

According to a seventh aspect of the present invention, a pipe material for a refractory structure according to the invention according to the seventh aspect of the present invention (hereinafter, referred to as a “piping material of a seventh aspect”) is a pipe material of the sixth aspect and extends at least in a pipe circumferential direction. The synthetic resin tube made of the oriented tube is molded from a composition containing at least a partly crosslinked polyolefin as a main component.

The piping material for a fire-resistant structure according to the invention of claim 8 of the present invention (hereinafter referred to as "the piping material of claim 8") is the piping material of claim 6 or claim 7,
The refractory thermal expansion material layer was formed by winding a tape-like refractory thermal expansion material around a synthetic resin tube.

The synthetic resin tube used in the present invention is an oriented tube that is stretched at least in the circumferential direction of the tube.
A tube obtained by stretching a tubular body made of a crystalline resin at least in the circumferential direction at a temperature at which it can be oriented, and having a property of shrinking at least in the circumferential direction when heated to a temperature higher than the crystallization temperature. . Therefore, a crystalline synthetic resin that is oriented when stretched, for example, polyethylene, polypropylene, polyamide, polyacetal, or the like is used. Among these resins, an oriented tube made of a cross-linked polyolefin is preferable because it has a high degree of orientation in the circumferential direction of the tube, and a high-strength tube is obtained, and is easily stretched and easily molded. .

As long as the synthetic resin pipe is stretched at least in the pipe circumferential direction, a biaxially oriented pipe stretched in two directions, the pipe circumferential direction and the pipe axis direction, has a strength as a pipe. This is preferable because the directionality is lost.

The polyolefin resin used in the present invention includes L-LDPE (linear low density polyethylene), LDPE (low density polyethylene), MDPE (medium density polyethylene), HDPE (high density polyethylene)
Such as polyethylene, random PP (polypropylene),
Examples include polypropylene such as homo PP (polypropylene) and block PP (polypropylene).

Additives may be appropriately added to the polyolefin resin used in the present invention. For example,
Flame retardants, such as antioxidants, light stabilizers, ultraviolet absorbers, lubricants, etc.
Additives such as an antistatic agent are appropriately used to obtain desired physical properties. Add a small amount of what can be a crystal nucleating agent,
It is also possible to refine the crystal to help uniform the properties.

The method for crosslinking the polyolefin resin is not particularly limited.
General-purpose means such as ultraviolet rays, hot water crosslinking, and thermal crosslinking may be used. However, in the case of thick-walled products, in the case of electron beams or ultraviolet rays, thermal crosslinking is most effective because the permeability of the radiation source is low, and in the case of hot-water crosslinking, the penetration rate of hot water is low.

When performing thermal crosslinking, it is necessary to add a thermal crosslinking agent in advance. The thermal crosslinking agent used for the thermal crosslinking is not particularly limited, but an organic peroxide can be used, and can be appropriately selected from the viewpoint of the molding temperature and the compatibility of the polyolefin resin to be used. Include dicumyl peroxide, α, α'-bis (t-butylperoxy-m-isopropyl) benzene, cyclohexane peroxide, 1,1-di (t-butylperoxy) cyclohexane, 1,1-di (T-butylperoxy) 3,3,5-trimethylcyclohexane, 2,2-
Di (t-butylperoxy) octane, n-butyl-
4,4-di (t-butylperoxy) vererate, di-
t-butyl peroxide, benzoyl peroxide, cumyl peroxy neodecanate, t-butyl peroxybenzoate, t-butyl peroxyisopropyl carbonate, t-butyl peroxyallyl carbonate, t-butyl peracetate, 2,2- Screw (t-
(Butylperoxy) butane, di-t-butylperoxyisophthalate, t-butylperoxymaleic acid, diazoaminobenzene, N, N'-dichloroazodicarbonamide, trichloropentadiene, trichloromethanesulfochloride, methyl ethyl ketone per Oxide, 2,5-dimethyl-2,5-di (t-butylperoxy) hexyne-3,2,5, -dimethyl-2,5-di (t-butylperoxy) hexane and the like. Mil peroxide, α, α'-bis (t-butylperoxy-m-isopropyl) benzene, t-butylcumyl peroxide, benzoyl peroxide, t-butylperoxybenzoate, methyl ethyl ketone peroxide, 2,5-dimethyl -2,5-di (t-butylperoxy) hexyne -3,2,5-dimethyl-2,
5-di (t-butylperoxy) hexane is preferred,
Dicumyl peroxide, α, α'bis (t-butylperoxy-m-isopropyl) benzenemethylethylketone peroxide, 2,5-dimethyl-2,5-di (t-butylperoxy) hexyne-3,2, 5-Dimethyl-2,5-di (t-butylperoxy) hexane is more preferred.

The amount of the thermal crosslinking agent to be added is not particularly limited. If the amount is too small, the gel fraction of the finally obtained thermal crosslinking will not be sufficiently high, and the effect of crosslinking will not be obtained. It is preferable that the content is 0.001 to 5 parts by weight, preferably 0.005 to 5 parts by weight, based on 100 parts by weight of the polyolefin resin. It is more preferable that the amount is not less than 3 parts by weight and not more than 3 parts by weight.

In the present invention, the degree of crosslinking of the synthetic resin pipe in at least the circumferential direction or the biaxially oriented pipe made of a composition containing a crosslinked polyolefin as a main component is 5% or more and 70% or less. It is preferred that
The reason is that if the degree of cross-linking is less than 5%, the molecular chains slip through by stretching at a temperature equal to or higher than the melting point, and if it exceeds 70%, the elongation of the resin is reduced, so that high-magnification stretching may not be possible. That's why. In the present invention, the degree of crosslinking is JIS.
It is represented by a gel fraction (%) represented by the following formula based on K6769.

[0024]

(Equation 1)

In the above formula, the weight of the sample after the solvent extraction means that the uncrosslinked resin remaining in the sample is dissolved by using a solvent capable of dissolving the selected uncrosslinked raw material resin. This is the weight of only the remaining insoluble matter.

The method for producing an alignment tube of the present invention is not particularly limited, but a resin composition containing a polyolefin resin is supplied from an extruder into a mold, and the polyolefin resin is crosslinked in the mold. Stretched at least in the radial direction while shaping into the cross-sectional shape of the mold, and after orienting the polyolefin resin at least in the circumferential direction of the pipe, a method of cooling and solidifying, a billet in advance using a resin composition containing the polyolefin resin. And a method of stretching the billet by a die-mandrel method and crosslinking a polyolefin resin.

In the above method, as a method for supplying the resin into the mold, there is a method in which the resin is pressure-fed using a pressure pump capable of continuously applying heat to the raw material resin.

The layered silicate used in the present invention means a silicate mineral having exchangeable cations between layers, and is usually
Thickness is about 1mm, average aspect ratio is about 20-20
Approximately 0 fine flaky crystals are aggregated by ionic bonding. The type of the layered silicate is not particularly limited,
Examples include smectite-based clay minerals such as montmorillonite, saponite, hectorite, hiderite, stevensite, and nontronite; natural mica such as vermiculite and halloysite; and synthetic mica such as swellable mica (swellable mica). And synthesized ones can be used. Preferably, montmorillonite,
Synthetic mica is used.

The addition amount of the layered silicate is determined by the thermoplastic resin 10
The amount of the layered silicate is preferably 0.1 to 50 parts by weight based on 0 part by weight. The exchangeable cation existing between the layers of the layered silicate used in the present invention may be previously ion-exchanged with a cationic surfactant or the like. In particular, in the case of a polyolefin resin, since it is a non-polar resin, it is better to make the interlayer hydrophobic in advance by, for example, cation exchange with a cationic surfactant, whereby a higher affinity between the layered silicate and the polyolefin resin. It is preferable because it can be obtained.

That is, the exchangeable cation existing between the layers B and B of the layered silicate (the crystal structure of the layered silicate is shown in FIG. 6) (the crystal of the montmorillonite in which the cubic portion shown in FIG. 6 is enlarged) The structure is shown in FIG. 7) generally means ions such as sodium and calcium on the crystal surface C.
Since these ions have an ion exchange property with a cationic substance, various cationic substances such as a cationic surfactant can be inserted between the layers. In addition, as described above, a product in which the interlayer of the layered silicate is ion-exchanged with a cationic substance is referred to as an “organized layered silicate”,
It is preferably used because it is easier to disperse in a resin than a non-organized layered silicate.

The cationic substance that previously makes the interlayer hydrophobic is not particularly limited, and a cationic surfactant is usually used, and examples thereof include quaternary ammonium salts and quaternary phosphonium salts. Preferably, a quaternary ammonium salt having an alkyl chain having 8 or more carbon atoms is used. When an alkyl chain having 8 or more carbon atoms is not contained, the hydrophilicity of the alkyl ammonium ion is strong, and it may be difficult to sufficiently depolarize the interlayer of the layered silicate.

As the quaternary ammonium salt, for example,
Lauryl trimethyl ammonium salt, stearyl trimethyl ammonium salt, trioctyl ammonium salt, distearyl dimethyl ammonium salt (hereinafter sometimes abbreviated as DSDM), di-hardened tallow dimethyl ammonium salt, distearyl dibenzyl ammonium salt and the like. .

The cation exchange capacity of the layered silicate used in the present invention is not particularly limited, and is 50 to 200 meq / l.
It is preferably 00 g. 50 meq / 100g
If less, the amount of the cationic surfactant intercalated by ion exchange between the crystal layers is small, so that the layers may not be sufficiently depolarized.
If it exceeds 200 milliequivalents / 100 g, the bonding strength between the layers of the layered silicate becomes strong, and the crystal flakes are delaminated.
This is because it may be difficult to peel (peel).

The average interlayer distance of the layered silicate of the present invention is X
The average interlayer distance is preferably 6 nm or more, as detected by line analysis measurement. In general, the layers of the layered silicate that are not dispersed are aggregated with each other by ionic bonding force and are stably present at an interlayer distance of about 1 nm. By reducing the ionic interaction between the layers as much as possible, that is, by reducing the interlayer distance to 6 nm or more, if the flakes of the layered silicate can be dispersed in the resin, the mechanical strength and the thermal properties can be significantly improved. It becomes possible.

The refractory heat-expanding material of the present invention is not particularly limited as long as it can be expanded by heat at the time of fire and can close the through-hole while crushing the alignment tube. A resin component containing a rubber component, a resin composition (1) containing a neutralized heat-expandable graphite and an inorganic filler or a resin component containing a rubber component, a phosphorus compound, a neutralized heat-expandable graphite; What consists of resin composition (2) containing an inorganic filler is preferable.

Examples of the rubber component include natural rubber (NR), isoprene rubber (IR), butadiene rubber (BR), and 1,2-polybutadiene rubber (1,2-B
R), styrene-butadiene rubber (SBR), chloroprene rubber (CR), nitrile rubber (NBR), butyl rubber (IIR), ethylene-propylene rubber (EPM, E
PDM), chlorosulfonated polyethylene (CSM),
Acrylic rubber (ACM, ANM), epichlorohydrin rubber (CO, ECO), polyvulcanized rubber (U), silicone rubber (O), fluoro rubber (FKM, FZ), urethane rubber (U), polyisobutylene rubber, butyl chloride rubber And the like. These may be used alone or in combination of two or more.

Examples of the resin component other than the rubber component include polyolefin resins such as polypropylene resin, polyethylene resin, poly (1-) butyne resin, polypentene resin, polystyrene resin, acrylonitrile-butadiene-styrene. Resin, polycarbonate resin, polyphenylene ether resin, acrylic resin, polyamide resin, polyvinyl chloride resin, phenol resin, polyurethane resin and the like. These may be used alone or in combination of two or more.

The above resin component may be subjected to modification, cross-linking or the like as long as the fire resistance of the resin composition (1) and the resin composition (2) is not impaired. The method of modification and crosslinking is not particularly limited, and is performed by a known method. The heat-expandable graphite is a conventionally known substance, and powders such as natural scale graphite, pyrolytic graphite, and quiche graphite, concentrated sulfuric acid, nitric acid, inorganic acids such as selenic acid, and concentrated nitric acid,
A graphite intercalation compound formed by treating with a strong oxidizing agent such as perchloric acid, perchlorate, permanganate, dichromate, hydrogen peroxide, etc., while maintaining the layered structure of carbon. It is a crystalline compound.

The neutralized heat-expandable graphite is obtained by neutralizing the acid-expandable heat-expandable graphite with ammonia, an aliphatic lower amine, an alkali metal compound, an alkaline earth metal compound and the like. Things. The aliphatic lower amine is not particularly limited, and includes, for example, monomethylamine, dimethylamine, trimethylamine, ethylamine, propylamine, butylamine and the like.

The above-mentioned alkali metal compound and alkaline earth metal compound are not particularly restricted but include, for example, hydroxides, oxides, carbonates, sulfates and organic acid salts of potassium, sodium, calcium, barium, magnesium and the like. And the like. The particle size of the neutralized heat-expandable graphite is preferably 20 to 200 mesh. When the particle size is smaller than 200 mesh, the degree of expansion of graphite is small, a predetermined refractory insulation layer cannot be obtained, and when the particle size is larger than 20 mesh, there is an advantage that the degree of expansion of graphite is large,
When kneading with a resin component described later, dispersibility deteriorates, and a decrease in physical properties is inevitable.

Commercial products of the above-described neutralized heat-expandable graphite include, for example, “Frame Cut GRE” manufactured by Tosoh Corporation.
P-EG "," GRAFG "manufactured by UCAR Carbon
UARD ”and the like.

The inorganic filler is not particularly limited.
For example, metal oxides such as alumina, zinc oxide, titanium oxide, calcium oxide, magnesium oxide, iron oxide, tin oxide, antimony oxide, ferrites; calcium hydroxide, magnesium hydroxide, aluminum hydroxide, hydrotalcite, etc. Metal carbonates such as hydrous inorganic substances, basic magnesium urate, calcium carbonate, magnesium carbonate, zinc carbonate, strontium carbonate, barium carbonate; calcium salts such as calcium sulfate, fiber gypsum, calcium silicate, silica, diatomaceous earth, dawsonite, barium sulfate ,
Talc, clay, mica, montmorillonite, bentonite, activated clay, sepiolite, imogolite, sericite, glass fiber, glass beads, silica-based balun, aluminum nitride, boron nitride, silicon nitride, carbon black, graphite, carbon fiber, carbon balun, Charcoal powder, various metal powders, potassium titanate, magnesium sulfate "MOS" (trade name), lead zirconate titanate, aluminum borate, molybdenum sulfide, silicon carbide, stainless steel fiber, zinc borate, various magnetic powders, slag fiber, Fly ash and the like. These inorganic fillers may be used alone or in combination of two or more. Among the above inorganic fillers, hydrated inorganic substances and / or metal carbonates are particularly preferred. It is considered that the hydrated inorganic substance and the metal carbonate contribute to the improvement of the strength of the combustion residue and the increase of the heat capacity because they function as aggregate.

In particular, the carbonate (calcium carbonate, magnesium carbonate) of a metal belonging to Group II or Group III of the periodic table foams when the resin composition (1) is burned to form a fired product. From the viewpoint of increasing the The calcium hydroxide, magnesium hydroxide, water-containing inorganic substances such as aluminum hydroxide, the endothermic occurs due to the water generated by the dehydration reaction at the time of heating, the point that the temperature rise is reduced and high heat resistance is obtained, and Oxide remains as a heating residue, which is particularly preferable in that it functions as an aggregate, thereby improving the strength of the residue. Magnesium hydroxide and aluminum hydroxide have different temperature ranges in which the dehydration effect is exerted. Therefore, when used in combination, the temperature range in which the dehydration effect is exerted expands, and a more effective temperature rise suppression effect is obtained.

The particle size of the inorganic filler is 0.5 to
It is preferably 100 μm, more preferably 1 to 50 μm.

When the amount of the inorganic filler is small, it is preferable that the particle size is small because the dispersibility greatly affects the performance. However, when the amount is less than 0.5 μm, secondary aggregation occurs and the dispersibility is poor. Become. When the addition amount of the inorganic filler is large, as the high filling proceeds, the viscosity of the resin composition increases and the moldability decreases, but the viscosity of the resin composition may be reduced by increasing the particle size. From the viewpoint that it is possible, those having a large particle size are preferable. On the other hand, when the particle size exceeds 100 μm, the surface properties of the molded article and the mechanical properties of the resin composition deteriorate. Further, the inorganic filler is more preferably used in combination of those having a large particle size and those having a small particle size. By using the inorganic filler in combination, it is possible to maintain high mechanical performance of the heat-expandable refractory layer while maintaining high mechanical performance. It can be filled.

Commercially available inorganic fillers include, for example, aluminum hydroxide, "Hygilite H-42M" having a particle size of 1 μm (manufactured by Showa Denko KK), and "Hygilite H-31" having a particle size of 18 μm ( (Showa Denko KK), and
"Whiteton S" having a particle size of 1.8 μm which is calcium carbonate
B red "(manufactured by Shiroishi Calcium Co., Ltd.)," BF3
00 "(manufactured by Bihoku Powder Chemical Co., Ltd.). In the resin composition (1), the compounding amount of the neutralized heat-expandable graphite is preferably 15 to 300 parts by weight based on 100 parts by weight of the resin component. When the amount is less than 15 parts by weight, a fireproof heat insulating layer having a sufficient thickness is not formed, so that the fire resistance is reduced. When the amount is more than 300 parts by weight, the mechanical strength is greatly reduced, and the material cannot be used.

In the above resin composition (1), the amount of the inorganic filler is from 30 to 50 per 100 parts by weight of the resin component.
0 parts by weight is preferred. If the amount is less than 30 parts by weight,
Sufficient fire resistance cannot be obtained with a decrease in heat capacity, and if it exceeds 500 parts by weight, mechanical strength is greatly reduced, and there is a possibility that it cannot be used. The total amount of the neutralized heat-expandable graphite and the inorganic filler is 100%
200 to 600 parts by weight based on parts by weight is preferred. If the total amount is less than 200 parts by weight, sufficient fire resistance cannot be obtained, and if the total amount exceeds 600 parts by weight, mechanical strength is greatly reduced, and there is a possibility that it cannot be used.

As the resin composition (2), a resin composition containing a resin component including a rubber component, a phosphorus compound, neutralized heat-expandable graphite, and an inorganic filler is used. The neutralized heat-expandable graphite and the inorganic filler used in the resin composition (2) are the same as those in the resin composition (1). By blending a phosphorus compound in the resin composition (2), flame retardancy and shape retention of combustion residues are improved. The phosphorus compound is not particularly limited, for example,
Various phosphoric esters such as red phosphorus, triphenyl phosphate, tricresyl phosphate, trixylenyl phosphate, cresyl diphenyl phosphate, xylendiphenyl phosphate, and metal phosphates such as sodium phosphate, potassium phosphate, and magnesium phosphate Examples thereof include salts, ammonium polyphosphates, and compounds represented by the following general formula (a). Among these, from the viewpoint of fire resistance, red phosphorus, ammonium polyphosphates and compounds represented by the following general formula (a) are preferable, and performance, safety,
Ammonium polyphosphates are more preferable in terms of cost and the like.

[0049]

Embedded image

In the formula (a), R 1 and R 3 represent hydrogen, a linear or branched alkyl group having 1 to 16 carbon atoms, or an aryl group having 6 to 16 carbon atoms. R2 is
A hydroxyl group, a linear or branched alkyl group having 1 to 16 carbon atoms, a linear or branched alkoxyl group having 1 to 16 carbon atoms, an aryl group having 6 to 16 carbon atoms, or a 6 to 16 carbon atom Represents an aryloxy group.

The above-mentioned red phosphorus improves the flame-retardant effect when added in a small amount. As the red phosphorus, commercially available red phosphorus can be used, but from the viewpoint of moisture resistance and safety such as not spontaneously igniting during kneading, those obtained by coating the surfaces of red phosphorus particles with a resin or the like are preferred. Used. The ammonium polyphosphates are not particularly limited, and include, for example, ammonium polyphosphate, melamine-modified ammonium polyphosphate, and the like, but ammonium polyphosphate is preferably used from the viewpoint of handleability and the like. As a commercial product, for example,
"EXOLIT AP422", "E
XOLIT AP462 "," Sumisafe P "manufactured by Sumitomo Chemical Co., Ltd.," Terraju C60 "manufactured by Chisso," Terra
Ju C70 "," Terra-J C80 "and the like.

The compound represented by the above general formula (a) is not particularly restricted but includes, for example, methylphosphonic acid, dimethyl methylphosphonate, diethyl methylphosphonate, ethylphosphonic acid, propylphosphonic acid, butylphosphonic acid, 2-methylpropyl Phosphonic acid, t-butylphosphonic acid, 2,3-dimethyl-butylphosphonic acid, octylphosphonic acid, phenylphosphonic acid, dioctylphenylphosphonate, dimethylphosphinic acid, methylethylphosphinic acid, methylpropylphosphinic acid, diethylphosphine Acid, dioctylphosphinic acid, phenylphosphinic acid, diethylphenylphosphinic acid, diphenylphosphinic acid, bis (4-methoxyphenyl) phosphinic acid and the like. Among them, t-butylphosphonic acid is
Although expensive, it is preferable in terms of high flame retardancy. The above phosphorus compounds may be used alone or in combination of two or more.

The above phosphorus compound is preferably calcium carbonate,
It is considered that the reaction with a metal carbonate such as zinc carbonate promotes expansion. In particular, when ammonium polyphosphate is used as the phosphorus compound, a high expansion effect is obtained. In addition, it acts as an effective aggregate and forms a combustion residue having high shape retention after burning. In the above resin composition (2), the compounding amount of the phosphorus compound is from 50 to 100 parts by weight of the resin component.
150 parts by weight are preferred.

If the amount is less than 50 parts by weight, sufficient shape retention of the combustion residue cannot be obtained, and if it exceeds 150 parts by weight, the mechanical properties are greatly reduced, and there is a possibility that the material cannot be used. In the resin composition (2), the blending amount of the neutralized heat-expandable graphite is 15 to 300 parts by weight based on 100 parts by weight of the resin component for the same reason as in the resin composition (1). preferable.

In the resin composition (2), the amount of the inorganic filler is preferably 30 to 500 parts by weight based on 100 parts by weight of the resin component for the same reason as in the resin composition (1). The total amount of the phosphorus compound, the neutralized heat-expandable graphite and the inorganic filler is 100% of the resin component.
200 to 600 parts by weight based on parts by weight is preferred.

When the total amount is less than 200 parts by weight, sufficient fire resistance cannot be obtained, and when the total amount exceeds 600 parts by weight, the mechanical strength is so large that it may not be usable.
In the resin compositions (1) and (2), phenol-based, amine-based, sulfur-based antioxidants, metal harm inhibitors, antistatic agents, stabilizers, and cross-linking agents are provided as long as the physical properties are not impaired. , A lubricant, a softener, a pigment and the like may be added.

The resin compositions (1) and (2) are obtained by melt-kneading the above components using a known kneading apparatus such as an extruder, a kneader mixer, a two-roller, and a Banbury mixer. be able to. Further, the shape of the refractory thermal expansion material is preferably a tape shape, and a material having self-adhesiveness is particularly preferable. In other words, when the tape is formed, winding around the synthetic resin tube becomes easy.

The material for imparting self-adhesiveness to the refractory heat-expandable tape is not particularly limited, and examples thereof include butyl rubber mixed with a liquid resin such as polybutene and a petroleum resin as a tackifier. The thickness of the refractory thermal expansion tape is preferably 0.3 to 2 mm. The thickness is
If it is less than 0.3 mm, it is necessary to wind it many times to obtain a required winding thickness, and if it exceeds 2 mm, it becomes difficult to wind it to a predetermined thickness.

The wrapping thickness of the refractory thermal expansion tape is as follows:
It is preferable that the diameter is set to 1 to 20% of the outer diameter of the wound synthetic resin tube. The winding thickness is 1 of the outer diameter of the synthetic resin tube.
%, A sufficient fire-resistant heat-insulating layer is not formed at the time of fire, and if it exceeds 20%, the fire-resistant heat-insulating layer does not expand sufficiently at the time of fire, so that the heat insulating property may be deteriorated.

The width of the above-mentioned fire-resistant thermal expansion tape is preferably 50 to 150% of the thickness of the penetration part of the fire protection compartment. 50% of thickness
If it is less than sufficient, a fire-resistant insulation layer will not be formed in the event of a fire,
If it exceeds 150%, the construction becomes difficult. A reinforcing material may be laminated on the refractory thermal expansion tape as long as the thermal expansion performance is not impaired.

The reinforcing material is not particularly limited. For example, paper, woven fabric, nonwoven fabric, film, wire mesh, metal plate (galvanized steel plate, iron plate, aluminum plate, etc.) and fiber mat (glass fiber, carbon fiber, etc.) Is used. Known papers such as kraft paper, Japanese paper, and K liner paper can be used as the paper. Incombustible paper highly filled with aluminum hydroxide or calcium carbonate, flame retardant paper containing a flame retardant, or coated with a flame retardant, rock wool, ceramic wool, inorganic fiber paper using glass fiber, carbon fiber paper, etc. When used, the fire resistance can be improved.

As the nonwoven fabric, a wet nonwoven fabric made of polypropylene, polyester, nylon, cellulose fiber or the like, a long-fiber nonwoven fabric, or the like can be used. As the film, polyethylene, polypropylene,
A resin film of polyamide, polyester, nylon, acrylic, or the like can be used.

As the above-mentioned wire mesh, a metal lath or the like can be used in addition to a wire mesh which is usually used. The base material such as the paper, woven fabric, nonwoven fabric, film, wire mesh, etc. may be laminated on one surface of the refractory thermal expansion tape, or may be used sandwiched between two refractory thermal expansion tapes.

In the case where the width of the fire-resistant thermal expansion tape is shorter than the length of the fire protection section penetrating portion, the tape is disposed so as to be located substantially at the center in the length direction of the fire protection section penetration section. Are preferably arranged such that the protrusion lengths on both sides of the fire protection section penetration portion are substantially equal. Further, it is preferable that the synthetic resin tube around which the fire-resistant thermal expansion tape is wound is disposed so as to be substantially at the center in the through hole of the fire protection section through portion 5.

[0065]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below.
This will be described in detail with reference to the drawings. FIG. 1 shows an embodiment of a piping material for a fire protection compartment according to the present invention.

As shown in FIG. 1, the piping material P for a fire protection compartment includes a biaxially oriented tube 9 as a synthetic resin piping material, and a refractory thermal expansion material layer 8. As shown in FIG. 1, the biaxially oriented tube 9 is obtained by stretching a resin composition containing a polyolefin resin 91 and a layered silicate 92 and at least partially crosslinked in the circumferential direction of the tube and in the axial direction of the tube. Is formed.

That is, the biaxially oriented tube 9 can be manufactured as follows using a forming apparatus 10 as shown in FIGS.

As shown in FIG. 2, this molding apparatus 10
An extruder 11 and a die 1 are provided. Die 1 is shown in FIG.
As shown in FIG. 1, a die body 2 and a mandrel 3 are provided.

The die body 2 is provided with a resin supply port 21 for supplying a molten resin extruded from an extruder (not shown) and a lubricant supply port 22, and from the end on the resin supply port 21 side to the center. A large-diameter cylindrical portion 23 is provided from the outlet side of the die body 2 toward the center, and a small-diameter cylindrical portion 23 is provided between the small-diameter cylindrical portion 23 and the large-diameter cylindrical portion 24. An enlarged-diameter tube portion 25 is provided which gradually increases in diameter from the portion 23 toward the large-diameter tube portion 24.

The mandrel 3 is a small-diameter cylindrical portion 2 of the die body 2.
A small-diameter cylinder; a fitting part 31 which is fitted over the substantially central part of the small-diameter cylindrical part 23 from an end of the small-diameter cylindrical part 23 to fit tightly into the small-diameter cylindrical part 23 to make the die body 2 and the mandrel 3 integrated. The cross-sectional shape of the tube to be substantially formed between the small-diameter shaft portion 32 forming the small-diameter thick-walled tubular thermal crosslinking zone 4 with the rest of the portion 23 and the large-diameter cylindrical portion 24 of the die body 2 A large-diameter shaft portion 33 that forms a cooling zone 6 having the same cross-sectional shape as described above, and a diameter is gradually increased from the small-diameter shaft portion 32 toward the large-diameter shaft portion 33, and the stretching zone 5 is provided between the large-diameter cylindrical portion 25. And an enlarged-diameter shaft portion 34 that forms

The fitting portion 31 has a spiral that guides the resin supplied from the resin supply port 21 to the thermal cross-linking zone 4 on the outer peripheral surface of the portion from the portion facing the resin supply port 21 to the boundary with the small diameter shaft portion 32. A groove 31a is provided. Also, mandrel 3
A lubricant supply passage 35 is formed from the fitting portion 31 toward the small-diameter shaft portion 32. The lubricant supply passage 35 extends from the outer peripheral surface of the small-diameter shaft portion 32 to the outer peripheral surface of the large-diameter shaft portion 34. It communicates with a spirally provided lubricant supply groove 36.

That is, the lubricant supply path 3 is
5 is supplied to the outer peripheral surfaces of the small-diameter shaft portion 32 and the enlarged-diameter shaft portion 34, which are resin contact surfaces, via a lubricant supply groove 36.

The method of forming the biaxially oriented tube 9 using the forming apparatus 10 is as follows. The resin composition obtained by kneading the polyolefin resin, the thermal crosslinking agent, and the organically modified layered silicate in the extruder 11 is mixed with the extruder 1
1 to the resin supply port 21 continuously.

The resin composition supplied to the resin supply port 21 is sent to the thermal cross-linking zone 4 through the spiral groove 31a, developed into a thick tube, and the thermoplastic resin in the mixture is reduced by 5% with the thermal cross-linking agent. Thermal crosslinking is performed so that the degree of crosslinking is at least 50%. The thermally cross-linked tubular cross-linked polyolefin resin is sent to the drawing zone 5 where the diameter is increased by the taper of the diameter-enlarging shaft portion 34, and the thickness is reduced to achieve uniaxial or more drawing.

In the cooling zone 6, the tubular shaped material formed into a gap between the large-diameter shaft portion 33 and the large-diameter cylindrical portion 24 by stretching in the stretching zone 5 is cooled to a temperature equal to or lower than the orientation relaxation temperature, that is, the crystallization starts. Cool while maintaining the shape below the temperature,
An axial alignment tube 9 is continuously obtained. Note that 2
In manufacturing the axially oriented tube 9, the lubricant supply port 22 is always used.
And oozes out to the inner peripheral surface of the die main body 2 and the outer peripheral surface of the mandrel 3 as the resin contact surface through the lubricant supply passage 35, and the crosslinked resin and the stretched resin, and the inner peripheral surface of the die main body 2 as the resin contact surface. The frictional resistance is reduced by being interposed between the outer peripheral surface of the mandrel 3.

On the other hand, the refractory thermal expansion material layer 8 is
Rubber component, expandable graphite described in 0-148079,
It is formed by winding a refractory thermal expansion tape (tape-shaped molded product) made of a composition containing an inorganic filler around the biaxially oriented tube 9. Then, by using the fire protection compartment piping material P thus obtained, a fireproof structure of the building fire protection compartment penetration portion of the present invention can be constructed as follows.

That is, as shown in FIG. 4, first, this fire-resistant structure has a diameter substantially equal to or slightly larger than the outer diameter of the pipe material P for the fire-prevention compartment as a penetration provided in the slab S as the fire-prevention compartment. The pipe material P for fire prevention compartment is inserted into the through hole S1 and connected to another pipe material (not shown) on both sides of the slab S. The mortar M is filled between the pipe material P for the fire protection compartment and the inner peripheral surface of the through-hole S1.

As described above, since the biaxially oriented tube 9 is an oriented tube extending at least in the circumferential direction,
As shown in FIG. 5, when a fire occurs, the biaxially oriented tube 9 is thermally contracted in the radial direction by heat to reduce the diameter. At the same time as the diameter of the biaxially oriented tube 9 is reduced, the diameter of the refractory thermal expansion material layer 8 is reduced, and the biaxially oriented tube 9 which has been softened or melted is thermally expanded so as to be crushed. Therefore, even if the biaxially oriented tube 9 has a large diameter, the gap when the biaxially oriented tube 9 is thermally deformed or burned out is small, and the thermal expansion of the wound refractory thermal expansion material layer 8 causes thermal expansion. The through-hole S1 can be completely closed to prevent the slab S from burning from one side to the other.

Further, since the biaxially oriented tube 9 is formed of a resin composition containing a layered silicate in the polyolefin resin, in addition to the fire resistance, the mechanical properties of the polyolefin resin,
Properties such as thermal properties and gas barrier properties are further improved. Since at least a part of the polyolefin resin is cross-linked, the mechanical strength and the thermal strength are further increased, and the thickness can be reduced. Furthermore, since the refractory thermal expansion material layer is formed of the refractory thermal expansion tape, there is no need to prepare a resin tube having a diameter suitable for each resin tube, unlike a commercially available kit, thereby reducing manufacturing costs.

The present invention is not limited to the above embodiment. For example, in the above-described embodiment, the fire-resistant thermal expansion material layer is formed in advance on the peripheral surface of the biaxially oriented pipe as a synthetic resin piping material. An expansion tape may be attached.

[0081]

Embodiments of the present invention will be described below in more detail.

Example 1 A die 1 as shown in FIGS. 2 and 3 having the following dimensions and an extruder 11 were prepared. [Die size]-Outer diameter of small diameter shaft portion 32: 17.05 mm-Inner diameter of small diameter cylindrical portion 23: 75.0 mm-Outer diameter of large diameter shaft portion 33: 136.4 mm-Inner diameter of large diameter cylindrical portion 24: 150mm [Extruder]-TEX30α manufactured by Japan Steel Works, L / D = 51, caliber 3
2mm

Then, high density polyethylene (density 0.953, melt flow rate (MFR))
0.03, weight average molecular weight 26,800, melting point 132 ° C)
Into an extruder, and from the position of L / D = 35, 2,5-dimethyl-2,5-di (t-
Butylperoxy) hexyne-3 (Perhexin 25B manufactured by NOF CORPORATION, 193 ° C half-life time 60 seconds) was added to the extruder at a ratio of 0.35 parts by weight to 10 parts by weight of the high-density polyethylene. / D = 35 as swellable mica (MAE-10 manufactured by Corp Chemical Co.)
0) to 5 parts by weight based on 100 parts by weight of the raw material resin, and
After adding 5 parts by weight of ER403 as an acid-modified polymer, mixing and kneading high-density polyethylene, swellable mica, and acid-modified polymer at a resin temperature of 170 ° C. in an extruder, the obtained resin composition is die-bonded. 1 through a metering pump 12 installed between the extruder 11 and the resin supply port 21 of the die body 2, a thermal crosslinking zone 4 having a clearance of 29.0 mm, a wall surface of 220 ° C. and a length of 200 mm, and a stretching zone 5 of 140
° C, the cooling zone 6 is continuously supplied into the die 1 set at 80 ° C, and at the same time, the outer surface of the raw resin containing the crosslinking agent is coated with the raw resin containing no crosslinking agent from the upstream side of the thermal crosslinking zone 4. Outer diameter 150 mm, inner diameter 136.4 mm,
A biaxially oriented crosslinked polyethylene pipe as a synthetic resin piping material in which the thickness of the coated uncrosslinked resin was 0.5 mm was continuously obtained.

In the extrusion stretching, polyethylene glycol (average molecular weight: 2,000, viscosity: 10.8 cSt (at 100 ° C.)) as a lubricant is supplied into the die through a lubricant supply port 22 by a plunger pump. Immediately before the thermal cross-linking zone, so as to reach the inner and outer surfaces of the resin. In addition, as the extruder 11, the screw shaft is configured such that the first full flight shape portion-the first
Inverted full flight shape part-second full flight shape part-second
Using an extruder sequentially provided with an inverted full-flight shape portion, a low-pressure portion (second portion) sandwiched between a high-pressure portion (first inverted full-flight shape portion) and a high-pressure portion (second inverted full-flight shape portion) From a full-flight shape) to 2,5-dimethyl-2,5-di (t-butylperoxy) hexyne-3 as a thermal crosslinking agent.
Was supplied.

Next, 40 parts by weight of butyl rubber ("Butyl # 065" manufactured by Exxon), 50 parts by weight of polybutene ("Polybutene # 100R" manufactured by Idemitsu Petrochemical Co., Ltd.), and hydrogenated petroleum resin ("ESCOLETS" manufactured by Tonex Corporation) # 532
0 ") 10 parts by weight, ammonium polyphosphate (" EXOLIT AP422 "manufactured by Clariant) 45 parts by weight,
30 parts by weight of neutralized heat-expandable graphite ("Frame Cut GREP-G" manufactured by Tosoh Corporation) and aluminum hydroxide ("Heidilite h-31" manufactured by Showa Denko KK) 2
After kneading 00 parts by weight using a roll, the obtained resin composition was press-molded to produce a 1 mm-thick and 80 mm-wide refractory thermal expansion tape.

The refractory thermal expansion tape was wound around the outer surface of the biaxially oriented polyethylene pipe having an outer diameter of 150 mm by two turns (wrapped thickness: 2 mm) to obtain a test piece of a piping material for a fireproof compartment. In addition, since this refractory thermal expansion tape had self-adhesiveness, the winding operation could be easily performed.

Then, as shown in FIG. 4, this test piece was cut into a slab S having a thickness of 100 mm and a diameter of 200 mm.
After that, the gap between the test piece and the slab S was filled with mortar M and fixed. The test piece fixed to the slab S is based on JIS A1304.
As a result of the time fire resistance test, the biaxially oriented polyethylene pipe was melted and burned out, but the gap formed in the through hole S1, which is the fire protection section penetration part, was closed by the thermal expansion of the fire resistant thermal expansion tape, and the non-heating side No flame penetration was observed.

(Comparative Example 1) The same procedure as in Example 1 was carried out except that a biaxially oriented crosslinked polyethylene pipe was not used as a synthetic resin pipe material but a simple high-density polyethylene pipe was used for the pipe coated with the fire-resistant thermal expansion tape. A test specimen was prepared, and a fire resistance test was performed on the test specimen for 2 hours in the same manner as in Example 1. As a result, the high-density polyethylene pipe was melted and burned out, and the gap formed in the fire protection compartment penetrating portion was filled with a fire-resistant thermal expansion tape. The flame could not be completely closed by thermal expansion, and a slight flame penetration was observed on the non-heated side.

[0089]

As described above, the fireproof structure of the building fire protection section penetration portion according to the present invention is configured as described above. Therefore, even if a large-diameter pipe of 150 mm or more is inserted into the fire protection section penetration portion, the fire protection structure can be used. The compartment penetration can be closed. Therefore, heat, flame,
It is possible to prevent smoke and the like from reaching the other side. According to the refractory structure of the third aspect, characteristics such as mechanical characteristics, thermal characteristics, and gas barrier properties are further improved.

The pipe material for a fire protection compartment according to the present invention has a fire-resistant and heat-expandable material layer provided in advance on the oriented pipe, which is a synthetic resin pipe material, as described above. The structure can be built. Furthermore, if the refractory heat-expanding material layer is formed by winding a tape-shaped refractory heat-expandable material like the refractory structure of claim 4 or the piping material of claim 8, the refractory heat-expanding material can be formed easily and at low cost. A layer of thermal expansion material can be formed.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing one embodiment of a piping material for a fire protection compartment according to the present invention.

FIG. 2 is a schematic view schematically showing an example of a molding apparatus used for manufacturing a synthetic resin piping material for the piping material for the fire protection compartment in FIG.

FIG. 3 is a sectional view of a die used in the molding apparatus of FIG. 2;

FIG. 4 is a cross-sectional view of a fire-prevention section illustrating a construction state of the fire-prevention section piping material of FIG. 1;

FIG. 5 is a cross-sectional view illustrating a state where the piping material for the fire prevention compartment of FIG. 1 receives heat during a fire.

FIG. 6 is a schematic view schematically showing a layered silicate.

FIG. 7 is a molecular structural diagram of montmorillonite which is a layered silicate.

[Explanation of symbols]

 P Fire protection compartment piping material S Slab (fire protection compartment) S1 Through hole (fire protection compartment penetration) 8 Fire resistant thermal expansion material layer 9 Biaxially oriented pipe (synthetic resin piping material) 91 Polyolefin 92 Layered silicate

Continued on the front page (72) Inventor Junichi Yokoyama 2-2, Kamitobagamichokocho, Minami-ku, Kyoto Sekisui Kagaku Kogyo Co., Ltd. (72) Inventor Akihiro Ogawa 2-2, Kamikabagamichocho-cho, Minami-ku, Kyoto Sekisui Engineering Co., Ltd. F term (reference) 2E001 DE01 GA65 GA66 HD11 HE01 JA06

Claims (8)

[Claims] 1. A synthetic resin pipe constituting a part of a pipe in a building is inserted into a through hole provided in a fire protection section of a building, and heat generated during a fire is generated between the through hole and the synthetic resin pipe. In the fire-resistant structure of a building fire-prevention section penetration portion provided with a fire-resistant thermal expansion material layer that expands and closes a through hole, the building is characterized in that the synthetic resin tube is an oriented tube extending at least in a tube circumferential direction. Fireproof structure at the penetration of fire protection compartment. 2. The fire-resistant structure of a penetration part of a building fire-prevention section according to claim 1, wherein the oriented tube extending at least in the circumferential direction is made of a composition containing a crosslinked polyolefin as a main component at least in part. 3. The fire-resistant structure of a building fireproof section penetration according to claim 2, wherein a layered silicate is added to the composition. 4. The building fire protection compartment according to claim 1, wherein the refractory thermal expansion material layer is formed by winding a tape-like refractory thermal expansion material around a synthetic resin pipe. Fire resistant structure at the penetration. 5. The fireproof structure for a building fireproof section penetration according to claim 1, wherein the mortar is filled in a gap between the fireproof thermal expansion material layer and the through hole. 6. A synthetic resin tube comprising an oriented tube extending at least in the circumferential direction of the tube and surrounding at least a portion of the synthetic resin tube inserted into a through hole provided in a fire protection section of a building. And a fire-resistant heat-expandable material layer that expands with heat at the time of fire and crushes the synthetic resin pipe and closes the through hole. 7. A synthetic resin tube comprising an oriented tube stretched at least in the circumferential direction of the tube is made of a composition containing a crosslinked polyolefin as a main component at least in part.
The piping material for a fire protection compartment according to the above. 8. The piping material for a fire protection compartment according to claim 6, wherein the refractory thermal expansion material layer is formed by winding a tape-like refractory thermal expansion material around a synthetic resin pipe.