JP3491153B2 - Fire prevention structure of fire protection compartment - Google Patents

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 novel fireproof compartment.

[0002]

2. Description of the Related Art A long body such as a cable or a pipe is arranged over a plurality of fireproof compartments through a through hole of the fireproof compartment. In this case, at the through-hole through which the elongated body passes, it is necessary to take fire prevention measures for closing the gap between the fire prevention partition and the elongated body in order to prevent the spread of fire in the event of a fire. Various types of fireproof structures for such fireproof compartments have been conventionally known. For example, as shown in FIG. 8, rock wool 4 is packed around a cable 3 as a long body that penetrates through the opening 2 of the floor fire protection compartment, and calcium silicate is placed on the upper and lower surfaces of the floor fire compartment. After arranging the lids 5 and 5 made of refractory plates such as the anchor bolts 6,
There is a structure in which it is fixed to the floor fireproof compartment at 6, and the fireproof putties 7 and 7 are packed and fixed in the gap between the cable and the lid.

However, in the above-mentioned structure, when the cable penetrating the floor fireproof compartment is replaced or additional construction is performed, it is necessary to remove all the fire protection members such as rock wool, lid, and fireproof putty. There is a problem that it takes a lot of work.

Moreover, these exchange works usually take several days to several weeks, but during that period, there is no fire protection member, and they are left open. Therefore, if a fire occurs within this period, flames or smoke may blow through the openings of the floor fire protection compartment, and the fire may spread.

Therefore, in order to solve these problems and to improve workability or compatibility of materials, a sachet containing inorganic fibers such as rock wool and ceramic fibers, a flexible material, a thermal expansion material and the like wrapped with cloth or the like. A method has been proposed in which a plurality of bodies are used to close the through-hole. For example, a method in which a through-hole is closed with a packaging body in which a fire-resistant material is wrapped with a cloth made of non-combustible fiber such as carbon cloth (JP-A-11-222955, JP-A-4-8979, JP-A-2-66653, etc.). ). Also, a method of closing the through-hole by using a bag made of an inexpensive synthetic resin such as polyethylene or polyvinyl
7-145442) is known.

However, in these methods, a shield plate for supporting the packet is indispensable. In the related art, for example, a fireproof construction method is used in which a calcium silicate plate is used as a shielding plate and a packaging body is arranged on the calcium silicate plate.
For this reason, since the shield plate is required, the work is troublesome and the cost is disadvantageous.

Further, these methods require a bag for packaging the contents. In particular, in the case of packaging bodies of different sizes, the labor and cost of producing the bag body become excessive. Further, in these methods, the bag body may be broken by flame or impact, and if the bag body is broken, desired fire resistance may not be obtained, or contents packed in one may fall. There is also a risk of being lost. In addition, depending on the material of the bag body, it may be very expensive, and there is a problem that cost reduction is hindered.

[0008]

As described above, in the prior art, there is still room for improvement in view of fire resistance, workability, and economic efficiency.

Therefore, the main object of the present invention is to provide a fireproof structure which is excellent in workability and economical efficiency as well as fireproof.

[0010]

DISCLOSURE OF THE INVENTION In view of these problems of the prior art, the present inventor has conducted extensive studies and found that a specific structure using a heat-expandable molded body can achieve the above object, Finally, the present invention has been completed.

That is, the present invention relates to the following fireproof structure for a fireproof compartment.

1. A fireproof structure of a fireproof partition having a through hole, wherein (1) a long body penetrates the through hole,
(2) The gap between the through-hole and the elongated body is closed by two or more heat-expandable moldings containing a soft urethane foam, an inorganic swelling agent and a shape-deformation preventing agent, and (3) the two or more heats. The fireproof structure for a fireproof partition body, wherein the expandable molded body is arranged so that the adjacent thermally expandable molded bodies are joined together when they are thermally expanded.

2. A fireproof structure of a fireproof partition having a through hole, wherein (1) a long body penetrates the through hole,
(2) The gap between the through-hole and the elongated body is closed by two or more heat-expandable moldings containing a soft urethane foam, an inorganic swelling agent and a shape-deformation preventing agent, and (3) the two or more heats. The expansive molded body is arranged in a state where adjacent thermally expansive molded bodies are in contact with each other, and a fireproof structure for a fireproof partition.

3. Item 3. The fire protection structure according to Item 1 or 2, wherein the shape of the thermally expandable molded body is a cube or a rectangular parallelepiped.

4. The fireproof structure according to any one of Items 1 to 3, which does not have a shielding plate for supporting the heat-expandable molded body.

5. Item 5. The fireproof structure according to any one of Items 1 to 4, wherein the flexible urethane foam is obtained from an aqueous urethane prepolymer.

6. Item 6. The fireproof structure according to any one of Items 1 to 5, wherein the inorganic expansive agent is expansive graphite.

7. 7. The fireproof structure according to any one of Items 1 to 6, wherein the shape-preventing agent is boric acid.

8. The total amount of the shape-inhibiting agent and the inorganic swelling agent is 50 with respect to 100 parts by weight of the flexible urethane foam.
The fireproof structure according to any one of Items 1 to 7, which is at least parts by weight.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION 1. Fireproof Structure The fireproof structure of the fireproof partition of the present invention is a fireproof structure of a fireproof partition having a through hole, wherein (1) the elongated body penetrates the through hole, and (2) the through hole. The gap with the elongated body is closed by two or more of a heat-expandable molded body containing a soft urethane foam, an inorganic swelling agent, and a shape-preserving agent,
(3) The two or more heat-expandable moldings are arranged so that adjacent heat-expanding moldings are joined to each other when they are thermally expanded.

According to the present invention, the fireproof compartment is provided with a through hole. More specifically, the through-hole is provided in any of the wall (side surface), the ceiling (top surface), or the floor (bottom surface) of the fire protection compartment. The number, size, shape, etc. of the through holes are not particularly limited. A long body penetrates through this through hole. The elongated body includes, for example, various cables for electric power and communication, various pipes for water, gas, etc., and all equipment necessary for building structures.

The gap between the through-hole and the elongated body is closed by two or more of a heat-expandable molded body containing a soft urethane foam, an inorganic swelling agent and a shape-deformation preventing agent. The shape, size, etc. of the molded body are not particularly limited and may be appropriately selected depending on the construction site, construction method and the like. In particular, the shape of the molded body is preferably a cube or a rectangular parallelepiped from the viewpoint of fire resistance, workability and the like.

According to the present invention, the two or more heat-expandable molded products are arranged so that, when they are thermally expanded, the heat-expandable molded products adjacent to each other can be joined together. That is, the method for arranging the heat-expandable molded bodies may be such that the heat-expandable molded bodies adjacent to each other can be joined to each other when they are thermally expanded due to fire or the like. Therefore, to that extent,
The moldings may be arranged in contact with each other, or may be arranged with a gap.

The "bonding" in the present invention means not only the case where the mutually adjacent heat-expandable molded bodies are completely bonded and integrated, but also a part of the mutually adjacent heat-expandable molded bodies (for example, when they are heated). It is also included when they are joined (the same shall apply hereinafter).

In the present invention, it is preferable that the moldings are arranged in contact with each other. That is, the present invention is a fireproof structure of a fireproof partition having a through-hole,
(1) A long body penetrates the through-hole, and (2) a gap between the through-hole and the long body includes a heat-expandable molding containing a soft urethane foam, an inorganic swelling agent, and a shape-preserving agent. Body 2
Due to the above, (3) the two or more thermally expandable molded bodies are arranged in a state where adjacent thermally expandable molded bodies are in contact with each other, and a fireproof structure for a fireproof partition is desirable. It is a mode.

In particular, when a cubic or rectangular parallelepiped (that is, hexahedral) heat-expandable molded body is used, it is preferable that the heat-expandable molded bodies adjacent to each other are arranged in contact with each other on either surface.

In the fireproof structure of the present invention, the two or more heat-expandable moldings are arranged so that the adjacent heat-expanding moldings are joined together when thermally expanded. Therefore, when thermal expansion is caused by a fire or the like, the thermally expandable molded products are bonded to each other. Depending on the heating temperature, these plural heat-expandable moldings can be integrated. In particular, the joined heat-expandable molded article can be held in place without falling downstairs by pressing the side cross section of the through-hole or the elongated body by thermal expansion. In this case, it is not necessary to particularly provide a means (fall prevention member) for preventing the fall. Further, even if there is a risk that the joined heat-expandable molded body may fall, it is possible to prevent the fall by supporting only a part of the joined heat-expandable molded body. For example, a part of the heat-expandable molded body is supported by a fall prevention member such as a wire, a wire mesh, and a metal plate (long-shaped H-shaped material, light-weight shaped steel such as U-shaped), or only a specific heat-expandable molded body is used. It suffices if the fall prevention member can support the. The fireproof structure of the present invention does not require a shield plate or the like for supporting all the individual packaging bodies unlike the conventional construction method.

The heat-expandable molded product used in the present invention has elasticity. For this reason, if the thermally expansive molded body is loaded while being compressed in the gap between the through-hole and the long body during construction, the through-hole and the long body will be sandwiched. Therefore, even at the time of construction, no fall prevention means is required. 2. Thermally Expandable Molded Product The thermally expandable molded product used in the present invention contains a soft urethane foam, an inorganic swelling agent and a shape collapse preventing agent.
Hereinafter, these components will be described.

The inorganic swelling agent is not particularly limited as long as it is an inorganic material having a property of foaming or expanding by heating, and the inorganic swelling agent used in a known foamable resin composition is used as it is. You can also Examples thereof include expansive graphite (also referred to as expansive graphite obtained by oxidizing flaky graphite powder with concentrated sulfuric acid or the like to intercalate a compound between graphite layers), borax, pearlite, and vermiculite. Of these inorganic expanders, expandable graphite is preferable.

The content of the inorganic swelling agent can be appropriately set depending on the kind of the resin component, the desired expansion ratio, etc., but is usually 10 to 4 in the components excluding water in the composition of the present invention.
It may be about 5% by weight, preferably 20 to 30% by weight.

The shape-inhibiting agent is not limited as long as it can retain the shape of the expansion layer formed by the expansion agent, and either an inorganic type or an organic type can be used (however, casein alone is used. Except the use).

Examples of the organic shape collapse preventing agent include phenol resin, polycarbonate, polyphenylene sulfide resin, polyphenylene ether resin, polyether ketone resin, polyether ether ketone resin, polyether sulfone resin, polysulfone resin, polyamide resin, polyacrylate. Resins, polyetherimide resins, fluororesins, corn starch and the like can be used. As the inorganic shape-inhibiting agent, for example, boric acid, borax, zinc borate, ammonium polyphosphate or the like can be used. Among these shape-inhibiting agents, it is preferable to use at least boric acid. That is, boric acid can be used alone or in combination with other shape-inhibiting agents. In this case, it is possible to use casein as another shape-disintegrating agent used in combination with boric acid.

The content of the shape-inhibiting agent can be appropriately set depending on the type of the shape-inhibiting agent, the type and amount of the inorganic swelling agent, etc. The weight ratio may be about 1: 1 to 10: 1, preferably 2: 1 to 5: 1. If the amount of the shape-inhibiting agent is too small, the shape-retaining ability may decrease.
If the amount of the inorganic swelling agent is too small, the fire resistance may decrease.

As the resin component in the composition of the present invention,
Use flexible urethane foam. Further, as the above-mentioned polyurethane, one obtained from any one raw material such as one-pack type and two-pack type can be used, but the one-pack type is particularly preferable. As the one-pack type, for example, a flexible urethane foam obtained from an aqueous urethane prepolymer can be preferably used. As the water-based urethane prepolymer, known products or commercially available products can be used. More specifically, the urethane-modified TDI represented by the following general formula (1)
(Tolylene diisocyanate) (prepolymer), urethane-modified MDI represented by the following general formula (2) (4,4 ')
-Diphenylmethane diisocyanate) (prepolymer) and the like and mixtures thereof can be used.

[0035]

[Chemical 1]

[0036]

[Chemical 2]

The content of the resin component can be appropriately set according to the type and amount of the shape-disintegration preventive agent and the inorganic swelling agent used. The amount may be usually 50 parts by weight or more, and preferably 100 parts by weight or more. In addition,
Although the upper limit of the total amount is not limited, it is usually about 900 parts by weight.

The composition of the present invention may optionally contain various additives used in known fire-proof expansive materials. For example, a surfactant, a cross-linking agent, a foam stabilizer, a catalyst, a foaming agent, a chain extender, a flame retardant, a stabilizer, an ultraviolet absorber, an antioxidant, a pigment, an antioxidant, fibers, a filler, etc. You can If necessary, an organic swelling agent such as azodicarbonamide, dinitropentamethylenetetramine, p, p′-oxybisbenzenesulfonylhydrazide can be used.

The method for producing the above-mentioned molded article is not particularly limited as long as a predetermined flexible urethane foam can be obtained, and can be appropriately determined according to the kind of polyurethane raw material used and the like. For example, a two-pack type method of reacting a polyisocyanate compound with water and a hydrophilic polyol having a hydrophilic group such as ethylene oxide added thereto, and a one-pack type method of reacting water with an aqueous urethane prepolymer can be used.

In the present invention, a one-pack type method, particularly a method using an aqueous urethane prepolymer, can be more preferably adopted. This method is advantageous in that a relatively large amount of water can be used, so that the slurry concentration and eventually the physical properties of the final product can be freely controlled. In addition, the one-pack type method is preferable in that it is suitable for production on an industrial scale and that a composition having more excellent performance can be obtained more reliably.

The method of using the aqueous urethane prepolymer will be described in more detail. First, an inorganic swelling agent and a shape-preserving agent are added to water to prepare a slurry, and then the aqueous urethane prepolymer is mixed with this slurry. It can be produced by foaming and curing. The water-based urethane prepolymer is not particularly limited as long as it gives a flexible urethane foam, and known or commercially available products can also be used. The degree of polymerization of the above prepolymer can also be appropriately selected according to the intended use and intended use of the final product and is not particularly limited.

As the inorganic swelling agent and the shape-preserving agent,
Each of the materials listed above can be used. Also in this case, it is preferable to use expansive graphite as the inorganic expansive agent. In addition, boric acid is preferably used as the shape-preventing agent.

The mixing ratio of the water-based urethane prepolymer, the inorganic swelling agent and the shape-disrupting agent may be set so that the composition of the present invention is finally obtained. Specifically, the mixing ratios listed above are used. You can use it.

The concentration of the slurry (concentration of solid content) can be appropriately set depending on the purpose of use, application, etc. of the final product, but is usually about 20 to 90% by weight, preferably 50 to 90% by weight.
It is 70% by weight. If the amount of water is too large, the shape stability of the obtained molded article may be reduced. Further, if the amount of water is too small, the viscosity of the slurry increases, so that the desired foamed cured product may not be obtained.

If desired, the slurry may contain other additives. For example, surfactants, dispersants, crosslinking agents, foam stabilizers, catalysts, foaming agents, chain extenders, flame retardants, stabilizers, ultraviolet absorbers, antioxidants, pigments, antioxidants, fibers, fillers, etc. Can be used.

The slurry may be prepared by mixing these components simultaneously or sequentially and then uniformly mixing and stirring with a known stirrer or the like.

Next, an aqueous urethane prepolymer is added to the above slurry. After the addition, continue stirring and mixing until the foaming of the slurry begins. The slurry to be foamed may be poured into a mold having a predetermined shape as needed. In this case, foaming and hardening are performed in a state of being injected into the mold.

The obtained molded product may be released from the mold as it is, but if necessary, the foamed cured product may be cured at 50 ° C. or higher. The conditions for the curing are not particularly limited as long as they can be removed from the mold and evaporated. For example, to obtain a foam-cured product having excellent shape stability by curing the foam-cured product together with the mold at about 100 ° C. to shrink the mold, and then curing at about 50 ° C. to evaporate water. You can These curing times may be appropriately set according to the curing temperature, the size of the foamed and cured product, and the like.

When a two-part type raw material of a hydrophilic polyol and an isocyanate compound to which ethylene oxide is added is used as the polyurethane raw material, an aqueous solution containing the above-mentioned hydrophilic polyol, inorganic swelling agent, shape-preventing agent and water is used. After the slurry is prepared, it can be produced by mixing the above-mentioned aqueous slurry with an isocyanate compound and foaming and curing.

As the hydrophilic polyol and the isocyanate compound to which ethylene oxide is added, known compounds can be used, respectively, and commercially available products can be used as they are. The combination of the hydrophilic polyol and the isocyanate compound, the compounding ratio, and the like can be appropriately selected depending on the intended use of the final product, desired physical properties, and the like. As the inorganic swelling agent, the shape collapse preventing agent and the like, the same ones as in the case of using the aqueous urethane prepolymer can be used. In addition, manufacturing conditions such as a molding method and a curing method may be carried out according to the case of using the above-mentioned aqueous urethane prepolymer.

[0051]

According to the fireproof structure of the present invention, when a specific heat-expandable molded body is thermally expanded due to a fire or the like, adjacent heat-expandable molded bodies are joined to each other. The shield plate can be eliminated.

Further, the heat-expandable molded article is effectively prevented from being deformed, and is not easily weakened even when exposed to a high temperature for a long time. Therefore, the heat-expandable molded product can be used as it is without being packed in a bag, and is superior in workability and cost efficiency to the conventional technique requiring a package.

[0053]

EXAMPLES Examples and comparative examples will be shown below to further clarify the features of the present invention. The present invention is not limited to these examples.

Embodiment 1 As shown in FIGS. 1 to 3, a rectangular opening (5) is provided in a floor (1), and several kinds of cables (communication and power cables) (2) and a cable are provided in the opening. Each rack (3) was penetrated.

Then, as shown in FIG. 1, three pairs of receiving members (7
Each of b) was fixed to the floor with an anchor bolt (8), and a fall prevention metal fitting (7a) was hung on one end of the receiving plate on the side not fixed with the anchor bolt, and hung across the longitudinal direction of the opening. Then, a plurality of rectangular parallelepiped heat-expandable molded products (4) were used and placed side by side on the metal fitting without a gap as shown in FIG. 1 to close the opening. At this time, as shown in FIG. 2, the respective heat-expandable molded products were arranged such that the surfaces of the adjacent molded products were in contact with each other.

The fall prevention metal fitting (7a) was made of U-shaped lightweight steel and was installed in the state shown in FIG. As shown in FIGS. 1 and 3, a part of each molded body is supported by the fall-prevention metal member to prevent the molded article from falling.

Next, a fire resistance test was conducted on the fireproof structure constructed as described above. The above fire protection structure was placed on a fire resistance test furnace, and the ISO standard heating curve [T = 345 log
The heating test was carried out for 1 hour in accordance with ₁₀ (8t + 1) +20 (where T is the average furnace temperature (° C) and t is the elapsed time (minutes) of the test). As a result, it was confirmed that good fire resistance was exhibited without burning of the cables and members on the non-heated side and dropping of the thermal expansion refractory block. Further, when the above structure was disassembled after the test, the heating sides of the respective heat-expandable refractory blocks were in an integrated state by joining.

As the heat-expandable refractory block, the following one was used. First, 70 parts by weight of water was added to a mixture of 67 parts by weight of a shape-preventing agent (boric acid) and 33 parts by weight of expandable graphite to prepare a slurry. To this slurry, 78 parts by weight of an aqueous urethane polymer was added, mixed with stirring, poured into a mold having dimensions of 12 cm × 12 cm × 17 cm, and foam-molded.
After curing in time, it was demolded. The foamed and cured product obtained was further cured in an oven at 50 ° C. for 2 days to evaporate the water content and obtain a sponge-like molded product.

The following components were used as the components in the table.

Boric acid: orthoboric acid (granular type), U.V. S. Expandable graphite manufactured by BORAX: “CA-60”, water-based urethane prepolymer manufactured by Sumikin Chemical: “EGH-401”, manufactured by Mitsui Chemicals, Inc. Example 2 As shown in FIG. 5, a wall (not shown) has a rectangular shape. An opening (6) is provided, a cable (communication and power cable) (2) and a cable rack (3) are passed through the opening, and the same thermally expansive refractory blocks (4) as in Example 1 are brought into contact with each other. By arranging in such a manner, the above-mentioned opening was closed to form a fireproof structure.

Next, a fire resistance test was conducted on the above fireproof structure. The above structure was set in a fire resistance test furnace, and Example 1 was used.
A heating test was conducted in the same manner as in. As a result, it was confirmed that good fire resistance was exhibited without burning of the cables and members on the non-heated side and dropping of the thermal expansion refractory block. Further, when the above structure was disassembled after the test, the heating sides of the respective heat-expandable refractory blocks were in an integrated state by joining.

Example 3 An example of construction when the area of the opening is small will be described. As shown in FIG. 7, by mounting only the bracket (7b) on the floor (not shown) and arranging the same heat-expandable refractory blocks (4) as in Example 1 so that they are substantially in contact with each other, the above-mentioned opening is formed. It was closed and formed a fireproof structure.

[Brief description of drawings]

FIG. 1 is a plan view showing a fireproof structure according to a first embodiment.

FIG. 2 is a cross-sectional view taken along the line A-A ′ of FIG.

3 is a cross-sectional view taken along the line B-B ′ of FIG.

FIG. 4 is a main body (7a) of the fall prevention metal fitting used in Example 1.
And FIG. 7 is a perspective view of a clasp (7b).

FIG. 5 is a front view showing a wall fireproof structure according to a second embodiment.

6 is a cross-sectional view taken along the line C-C ′ of FIG.

FIG. 7 is a plan view showing an example of construction in the case where the opening of the floor fire protection partition is relatively small.

FIG. 8 is a diagram showing a conventional fire protection structure.

[Explanation of symbols]

(1) ... Floor (2) ... Cable (3) ... Cable rack (4) ... Thermally expandable molded product (5) ... Opening (6) ... Opening (7a) ... Fall prevention metal fittings (7b) ... Payment (8) ... Anchor bolt (9) ... Wall

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁷ Identification code FI H02G 1/06 307 F16L 5/02 M (72) Inventor Kazuya Onodera 1-14-5 Shinkawa, Chuo-ku, Tokyo Kin cup 3 Building Japan Insulation Co., Ltd., Tokyo Headquarters (72) Inventor Katsumi Arai 1-14-5 Shinkawa, Chuo-ku, Tokyo Kin cup 3 Building Japan Insulation Co., Ltd. Tokyo Headquarters (72) Inventor Shinji Nomura Tokyo 1-14-5 Shinkawa, Chuo-ku Kinban No. 3 Building Tokyo Headquarters, Japan Insulation Co., Ltd. (72) Inventor Michio Suzuki 1-10-5 Kameari, Katsushika-ku, Tokyo (56) References 68076 (JP, A) JP 9-176498 (JP, A) JP 11-11537 (JP, A) JP 2001-348476 (JP, A) JP 2732435 (JP, B2) (58) Fields investigated (Int.Cl. ⁷ , DB name) H02G 3/22 C09K 21/02 E04B 1/94 F16L 5/02 F16L 5/04 H02G 1/06

Claims (7)

(57) [Claims] 1. A fireproof structure for a fireproof partition having a through hole, comprising: (1) a long body penetrating the through hole; (2) a gap between the through hole and the long body; flexible urethane foam, inorganic expansion agent and a form collapse inhibitor seen including, and,
It is closed by two or more of the heat-expandable moldings using at least boric acid as the shape-inhibiting agent , and (3) the two or more heat-expanding moldings are adjacent to each other when thermally expanded. The fire prevention structure of the fire prevention compartment, characterized in that they are arranged so as to join together. 2. A fireproof structure of a fireproof compartment having a through hole.
There (1) A long body penetrates the through hole, (2) The gap between the through hole and the elongated body is made of soft urethane foam.
Form, an inorganic swelling agent and a shape-preserving agent, and
2 or more of the heat-expandable molded article in which the shape-inhibiting agent is boric acid
Occluded by the above, (3) When the two or more heat-expandable molded articles are thermally expanded,
Arranged so that adjacent heat-expandable moldings are joined together.
Is The fireproof structure of the firebreak compartment. 3. The fire protection structure according to claim 1, wherein the shape of the thermally expandable molded body is a cube or a rectangular parallelepiped. 4. The fireproof structure according to claim 1, which does not have a shielding plate for supporting the heat-expandable molded body. 5. The fireproof structure according to any one of claims 1 to 4, wherein the flexible urethane foam is obtained from an aqueous urethane prepolymer. 6. The fireproof structure according to claim 1, wherein the inorganic expansive agent is expansive graphite. 7. The fireproof structure according to claim 1 , wherein the total amount of the shape-deformation preventing agent and the inorganic swelling agent is 50 parts by weight or more based on 100 parts by weight of the flexible urethane foam.