JP7368583B2 - Earthquake-resistant slit material - Google Patents

Description

The present invention relates to an earthquake-resistant slit material containing a polyisocyanurate foam.

In concrete structures, a method of reducing damage to the structure due to earthquakes is to install seismic slit materials. The seismic slit material includes a synthetic resin plate-like body as a component. Conventionally, several foams have been proposed as materials for synthetic resin plate-like bodies (see Patent Documents 1 and 2).

Patent No. 4124351 Japanese Patent Application Publication No. 2016-151116

Patent Document 1 proposes a phenolic resin foam. However, phenolic resin foams have the following problems.
Phenolic resin foam has the property of being corroded by alkali, whereas concrete is a very strong alkali. Therefore, the phenol resin foam is likely to deteriorate at locations where the phenol resin foam and concrete come into contact, and problems such as a decrease in strength may occur. Furthermore, in reinforced concrete structures, the acid in the phenolic resin foam is neutralized, and the non-conductive coating of the internal reinforcing bars breaks and corrodes, which may cause the structure to become brittle. Furthermore, it is said that 50 N/cm ² or more is required to withstand the lateral pressure during concrete pouring. Since the bending strength of the phenolic resin foam is about 40 N/cm ² , some kind of sheet reinforcement must be used to improve the bending strength. From the above, it is necessary to use a non-air permeable sheet reinforcing material on the surface of the phenolic resin foam. However, due to limitations in the manufacturing method, phenolic resin foams cannot be manufactured by integrally molding them with these non-air permeable sheet reinforcing materials. Therefore, the non-breathable sheet-like reinforcing material has no choice but to be attached with an adhesive or the like, which is a factor that reduces construction efficiency. Earthquake-resistant slit materials are also required to have deformation recovery properties. If the deformation recovery property is high, even if the synthetic resin plate is compressively deformed due to an earthquake, it can return to a shape close to its original state. Therefore, the possibility of gaps occurring after an earthquake can be reduced, and the initial performance can be maintained. However, the deformation recovery property of phenolic resin foam is low.

Patent Document 2 proposes a polycarbonate resin foam. However, polycarbonate resin foams have the following problems.
Polycarbonate resin has the property of being corroded by alkali, but concrete is a very strong alkali. Therefore, if the resin comes into contact with concrete, problems such as a decrease in the strength of the polycarbonate resin may occur. Also, the thermal conductivity of polycarbonate foam is high, causing a reduction in the insulation properties of concrete buildings. Furthermore, since polycarbonate resin is a thermoplastic resin and has poor fire resistance when used alone, it is necessary to laminate fire-resistant sheets when actually using it as a building material. As a result, economic and time costs increase.

The present inventors have completed the present invention as a result of intensive research to solve the above problems.

That is, the present invention is an earthquake-resistant slit material containing a synthetic resin plate-like body used for buried between a beam or a column and a wall in a concrete building,
The present invention provides an earthquake-resistant slit material in which the synthetic resin plate-like body includes a polyisocyanurate foam having an isocyanate index of 170 to 610.
The polyisocyanurate foam may have an apparent density of 25 to 55 kg/m ³ .
The polyisocyanurate foam may have a closed cell ratio of 80% or more.
The polyisocyanurate foam may contain a flame retardant in an amount of 0.5 to 25% by weight based on the total amount of the foam. The flame retardant may be a phosphoric acid ester.
The polyisocyanurate foam may be obtained by foaming a raw material composition in which the proportion of polyester polyol is 5% by weight or more out of 100% by weight of the polyol component.
The polyisocyanurate foam may be obtained by foaming a raw material composition using cyclopentane, hydrofluoroolefin (HFO), or both as a physical blowing agent.

According to the present invention, it is possible to provide an earthquake-resistant slit material that can achieve both good deformation recovery properties, heat insulation properties, and fire resistance without deteriorating the synthetic resin plate-like body and concrete.

The present invention will be explained in detail below. Note that the numerical range "X to Y" in this specification and claims means greater than or equal to X and less than or equal to Y. Additionally, if isomers exist in the described compounds, all possible isomers can be used in the present invention, unless otherwise specified.

The seismic slit material of the present invention has excellent deformation recovery properties, heat insulation properties, and fire resistance by having the configuration described below. For example, the deformation recovery property is 70% or more, preferably 80% or more. In the case of phenolic resin foam, the deformation recovery property is about 70%, and the seismic slit material of the present invention can exhibit an equivalent or higher deformation recovery property.

In the present invention, the deformation recovery property (%) is measured based on the "Equipment Quality Judgment Standards (May 2014 Edition): Performance Test Method for Slit Materials" established by the Urban Renaissance Agency, an independent administrative agency. It is a value. The specific test method is as follows. A synthetic resin plate specimen cut into 100 mm x 100 mm x 30 mm is compressed to 15 mm, and the load is returned to zero. After repeating this process 5 times to reduce the load to 0, the specimen is allowed to stand for 3 hours or more at 23 (±5)° C. and a relative humidity of 50 (+20-10)%, and the measured thickness is taken as the returned thickness. The loading speed is approximately 500 mm/min.

The seismic slit material of the present invention includes a synthetic resin plate-like body as a core material. As the core material used in the present invention, a synthetic resin plate can be used alone. Moreover, an inorganic fiber fireproofing material may be used as a reinforcing material on at least one end surface along the longitudinal direction of the core material. Examples of inorganic fiber fireproof materials include rock wool and ceramic fiber. Moreover, a fire-resistant sheet may be laminated on at least one end surface along the longitudinal direction of the core material. Examples of the fireproof sheet include metal foils such as aluminum and copper, noncombustible paper, and iron plates.

The synthetic resin plate-like body used in the present invention can have face materials on both sides. Due to the self-adhesive properties of the polyisocyanurate foam used in the synthetic resin plate of the present invention when foaming, the face material can be used as an integral molding, so there is no need to increase the number of man-hours required to use the face material. do not have. As the facing material, general facing materials (for example, metal foil, inorganic fiber facing material, organic fiber facing material, resin facing material, and combinations thereof) can be used, and specifically, aluminum foil, glass nonwoven fabric, Examples include calcium carbonate paper, aluminum hydroxide paper, polyester nonwoven fabric, kraft paper, aluminum kraft paper, polyvinyl chloride sheet, and those laminated with polyethylene resin. Polyisocyanurate foam is neutral, resistant to alkali corrosion, and does not cause concrete neutralization, so it can be used as a facing material regardless of whether it is breathable or non-porous. .

By having the configuration described below, the polyisocyanurate foam of the present invention can independently obtain a bending strength of 10 N/cm ² or more, preferably 15 N/cm ² or more, particularly preferably 50 N/cm ^{2 or} more. Facing materials can be used as needed. For example, if the bending strength is 15 N/cm2 ^or more, it is possible to use general facing materials (such as metal foil, inorganic fiber facing materials, organic fiber facing materials, resin facing materials, and combinations thereof) as an integral molding. The bending strength of the seismic slit material can be 50 N/cm ² or more. In addition, if the bending strength is 10 N/cm2 or ^more , relatively strong facing materials (for example, inorganic fiber facing materials, organic fiber facing materials, resin facing materials, combinations thereof, and combinations of these and metal foils) are used. By using it as an integral molding, the bending strength of the seismic slit material can be 50 N/cm ² or more.

The synthetic resin plate of the present invention essentially contains polyisocyanurate foam as a material. The synthetic resin plate-like body of the present invention may contain other elements such as a face material.

A polyisocyanurate foam is a resin foam having an isocyanurate ring in its molecular structure. Because the isocyanurate ring has a strong structure, polyisocyanurate foam is a material with excellent fire resistance. Furthermore, polyisocyanurate foam is neutral, is not easily corroded by alkali, and has the property of not causing concrete neutralization.

The isocyanate index of the polyisocyanurate foam of the present invention is preferably from 170 to 610, more preferably from 200 to 610, particularly preferably from 350 to 610. By adjusting it within the above range, both good deformation recovery properties and fire resistance can be achieved. Note that the isocyanate index of the polyisocyanurate foam has the same meaning as the isocyanate index of the composition (raw material composition) that is the raw material for the polyisocyanurate foam.

The isocyanate index of a raw material composition refers to the ratio of the number of moles of all active hydrogens in the reaction mixture, which is the total raw material formulation, to the number of moles of isocyanate groups in the polyisocyanate (NCO/OH molar ratio). Moreover, OHV in the following Examples and Comparative Examples refers to a hydroxyl value. When a plurality of polyols are added, the weighted average obtained by multiplying each hydroxyl value by the number of parts added and dividing by the total number of parts added of all polyols is defined as the average hydroxyl value (average OHV).

The apparent density of the polyisocyanurate foam of the present invention is preferably 25 to 55 kg/m ³ . It may be 29 to 50 kg/m ³ or 30 to 48 kg/m ³ . By setting the apparent density within the above range, fire resistance, deformation recovery properties, and heat insulation properties can be achieved in a well-balanced manner.

In the present invention, the apparent density of the polyisocyanurate foam is a value measured based on JIS K7222.

The closed cell ratio of the polyisocyanurate foam of the present invention is preferably 80% or more. It may be 82.5% or more, or 85% or more. The upper limit is not particularly limited, but is, for example, 99%. When the closed cell ratio is within the above range, good fire resistance can be ensured, and the balance with other properties such as heat insulation properties is also excellent.

In the present invention, the closed cell ratio of the polyisocyanurate foam is a value measured based on ASTM D2856.

There are no particular restrictions on the nurate rate of the polyisocyanurate foam of the present invention. It may be 20-40%, 22-40%, 25-40%, or 30-40%. When the nurate rate is controlled within the above range, the polyisocyanurate foam will have a good balance of fire resistance, deformation recovery properties, and heat insulation properties. In addition, in order to obtain a nurate rate within the above range, the isocyanate index is preferably 170 or more.

The nurate rate of the polyisocyanurate foam of the present invention is a value measured based on infrared absorption spectroscopy using a sample cut out at a depth of 3 mm from the surface of the foam. More specifically, the absorption peak area based on the nurate ring is divided by the sum of the absorption peak area based on the nurate ring, NH of urethane/urea, C=O of urea, and C=O of urethane/nurate. This is the calculated value of the ratio of nurate rings to the entire partial structure. More specifically, it is calculated as follows.
Nurate rate (%) = [a/(a+b+c+d)]×100
a: Absorption peak position based on nurate ring: 1410 cm ^-1 , area position: 1347.03 to 1464.67 cm ^-1 area b: Absorption peak position based on [NH] of urethane/urea: 1510 cm ^-1 , area Position: Area of 1460.81 to 1562.06 cm ^-1 c: Absorption peak position based on "C=O" of urea: 1595 cm ^-1 Area position: Area of 1566.88 to 1638.23 cm ^-1 d: Urethane. Absorption peak position based on "C=O" of Nurate: 1710 cm ^-1 , area position: 1636.3 to 1768.4 cm ^-1 area

The polyisocyanurate foams of the present invention may have flame retardants as a component.

Examples of the flame retardant include known flame retardants. For example, red phosphorus; ammonium phosphate compounds such as monoammonium phosphate, diammonium phosphate, triammonium phosphate, and ammonium polyphosphate; melamine compounds such as melamine phosphate, melamine cyanurate, and melamine; aluminum hydroxide, hydroxide Metal hydrates such as magnesium; antimony compounds such as antimony trioxide and antimony pentoxide; trimethyl phosphate, triethyl phosphate, triphenyl phosphate, tricresyl phosphate, tricylenyl phosphate, cresyl diphenol phosphate, phosphoric acid Phosphate ester compounds such as cresyl di-2,6-xylenyl, tris (dichloropropyl) phosphate, tris (chloropropyl) phosphate, and tris (tribromoneopentyl) phosphate; polyvinyl chloride, chloroprene rubber, chlorinated polyethylene, etc. Halogenated polymers; halogenated aromatic compounds such as hexabromobenzene, pentabromotoluene, ethylene bispentabromodiphenyl, decabromodiphenyl oxide, polypentabromobenzyl acrylate, polybromostyrene, tetrabromobisphenol A, tetrabromobisphenol S, etc. ; can be mentioned. Among these, phosphoric acid ester compounds are preferred. Particularly preferred phosphate ester compounds include triethyl phosphate, tris(2-chloroethyl) phosphate, tris(2-chloropropyl) phosphate, and tricresyl phosphate.

The content of the flame retardant is preferably 0.5 to 25% by weight based on the total amount of the polyisocyanurate foam. It may be 3 to 18% by weight, or 5 to 16% by weight. When the content is within the above range, the polyisocyanurate foam has good heat insulation properties and deformation recovery properties in a well-balanced manner while improving fire resistance. Note that the content of the flame retardant may be calculated from the content of the flame retardant in the raw material composition of the polyisocyanurate foam.

In the present invention, the "total amount of polyisocyanurate foam" refers to the amount of polyisocyanurate foam that has been made open by crushing, crushing, etc. (with a closed cell ratio of 0%) at 23 (±5) °C. , means the weight after being left for 16 hours or more at a relative humidity of 50 (+20-10)%.

The manufacturing method is not particularly limited as long as the polyisocyanurate foam described above can be obtained. The method for producing the polyisocyanurate foam of the present invention will be summarized below.

The polyisocyanurate foam of the present invention is obtained by obtaining a mixture (raw material composition) of a polyisocyanate component consisting of one or more types of polyisocyanates and a polyol side raw material liquid containing a polyol component consisting of one or more types of polyols. After that, this mixture and a physical foaming agent are mixed and foamed and cured. For example, it can be obtained by collision-mixing using a general-purpose high-pressure foaming machine or the like to obtain a mixed solution, and then putting the mixed solution into a mold of a predetermined size or the like and foaming and hardening it. A low-pressure injection machine is used for continuous molding, and flat plates, slab stock, etc. can be molded by discharging onto a belt conveyor at room temperature and atmospheric pressure. The basic manufacturing method shown in Patent Document 1 and Patent Document 2 is applied. The polyol side raw material liquid may contain a catalyst, a flame retardant, etc. as components other than the polyol component.

The polyisocyanate is not particularly limited as long as it is a compound having a plurality of isocyanate groups in one molecule structure. Suitable examples include aromatic polyisocyanate compounds. Examples include phenylene diisocyanate, tolylene diisocyanate, xylylene diisocyanate, diphenylmethane diisocyanate, dimethyldiphenylmethane diisocyanate, triphenylmethane triisocyanate, naphthalene diisocyanate, polymethylene polyphenyl polyisocyanate, and the like.

The 25° C. viscosity of the polyisocyanate component is preferably 150 to 750 mPa·s. Here, the viscosity is measured according to ASTM D4889.

The polyol is not particularly limited as long as it is a compound having a plurality of hydroxyl groups in one molecule structure. Examples include polyalcohols, condensates of polyalcohols (polyether polyols), condensates of polyalcohols and polycarboxylic acids (polyester polyols), and the like. Polyether polyols can also be obtained by adding alkylene oxide to polyalcohols. Examples of the alkylene oxide include alkylene oxides having 2 to 10 carbon atoms, particularly ethylene oxide and propylene oxide.

Examples of polyalcohols include ethylene glycol, butanediol, pentanediol, neopentyl glycol, hexanediol, cyclohexanedimethanol, bisphenol A, bisphenol F, bisphenol S, hydrogenated bisphenol A, hydrogenated bisphenol F, hydrogenated bisphenol S, and Examples include methylolpropane and glycerin.

Examples of polyether polyols include diethylene glycol, triethylene glycol, polyethylene glycol, propylene glycol, dipropylene glycol, tripropylene glycol, and polypropylene glycol.

Examples of polycarboxylic acids include succinic acid, citric acid, maleic acid, orthophthalic acid, isophthalic acid, terephthalic acid, hexahydrophthalic acid, tetrahydrophthalic acid, trimellitic acid, and pyromellitic acid.

Among polyester polyols, aromatic polyester polyols are preferred. More preferred are aromatic polyester polyols obtained by condensing phthalic acid with one or more of bifunctional, trifunctional, or polyfunctional polyalcohols or alkylene oxide adducts thereof. Aromatic polyester polyols obtained by condensing terephthalic acid and diethylene glycol are particularly preferred.

The number average molecular weight (Mn) of the polyether polyol is not particularly limited, but is preferably 100 to 5,000, 150 to 4,000, or 200 to 3,000.

The number average molecular weight (Mn) of the polyester polyol is not particularly limited, but is preferably 100 to 5,000, 150 to 4,000, or 200 to 3,000.

The average hydroxyl value of the polyol component is preferably 150 mgKOH/g or more, and the upper limit is not particularly limited, but is, for example, 1200 mgKOH/g. It is particularly preferable that the average hydroxyl value of the polyol component is 300 to 600 mgKOH/g. When the average hydroxyl value of the polyol component is within this range, the polyisocyanurate foam will have higher heat insulation properties and more suitable compressive strength, flyability, and dimensional stability while ensuring fire resistance.

When the polyol component is 100% by weight, the proportion of polyester polyol is preferably 5% by weight or more. By adjusting in this way, good deformation recovery properties can be obtained.

In the present invention, the average hydroxyl value is a value measured according to JIS K1557-1 (Plastics - Polyurethane raw material polyol test method - Part 1: How to determine hydroxyl value).

Examples of catalysts include trimerization catalysts. Preferably, it is a mixed catalyst with a trimerization catalyst, a resinization catalyst, and a foaming catalyst. Preferably, it is a mixed catalyst of a metal salt catalyst and an amine catalyst.

A trimerization catalyst is a catalyst for forming an isocyanurate ring. Examples include:
1) Metal oxides such as lithium oxide, sodium oxide, potassium oxide;
2) Alkoxides such as methoxy sodium, ethoxy sodium, propoxy sodium, butoxy sodium, methoxy potassium, ethoxy potassium, propoxy potassium, butoxy potassium;
3) Organic metal salts such as potassium acetate, potassium octylate, potassium caprylate, iron oxalate;
4) Tertiary amines such as 2,4,6-tris(dimethylaminomethyl)phenol, N,N',N"-tris(dimethylaminopropyl)hexahydrotriazine, triethylenediamine;
5) Derivatives of ethyleneimine;
6) Chelates of acetylacetone of alkali metals, aluminum, transition metals, quaternary ammonium salts;

Among these, organic metal salts and quaternary ammonium salts are preferred. More preferred is a combination of metal acetate and metal octylate. Particularly preferred is a combination of potassium acetate and potassium octylate.

There are no particular limitations on the resin forming catalyst and the foaming catalyst, and those used in the production of ordinary urethane foams can be used. Examples include amine catalysts such as monoamines, cyclic monoamines, diamines, triamines, ether diamines, cyclic polyamines, and alkanolamines.

Examples of monoamines include N,N-dimethylcyclohexylamine, N,N-dicyclohexylmethylamine, triethylamine, and N,N-dimethylbenzylamine.

Examples of cyclic monoamines include pyridine, N-methylmorpholine, and N-ethylmorpholine.

Examples of diamines include N,N,N',N'-tetramethylethylenediamine, N,N,N',N'-tetramethyl-1,3-propanediamine, N,N,N',N'-tetra Examples include methyl-1,3-butanediamine, N,N,N',N'-tetramethylhexanediamine, methylene-bis(dimethylcyclohexylamine), and N,N,N',N'-tetraethylethylenediamine.

Triamines include N,N,N',N',N"-pentamethyldiethylenetriamine, N,N,N',N',N"-pentamethyldipropylenetriamine, 2,4,6-tris(dimethyl (aminomethyl)-phenol.

Examples of ether diamines include bis(2-dimethylaminoethyl) ether, 2-(N,N-dimethylamino)ethyl-3-(N,N-dimethylamino)propyl ether, and 4,4'-oxydimethylene dimorpho One example is phosphorus.

Examples of cyclic polyamines include triethylenediamine, N,N'-dimethylpiperazine, N,N'-diethylpiperazine, N,N-dimethylaminoethylmorpholine, 1-isobutyl-2-methylimidazole, 1-butoxy-2- Examples include methylimidazole.

Examples of alkanolamines include N,N,N'-trimethylaminoethylethanolamine, N,N,N'-trimethylaminopropylethanolamine, 2-(2-dimethylamino-ethoxy)ethanol, N,N-dimethylamino Examples include ethanol, N,N-trimethyl-1,3-diamino-2-propanol, and N-methyl-N'-(2-hydroxyethyl)-piperazine.

As the flame retardant, those mentioned above can be used.

The physical blowing agent is not particularly limited, but is preferably a hydrocarbon (preferably C4 to C6) or a hydrofluoroolefin. More specifically, cyclopentane, HFO (1336mzz), and HFO (1233zd) can be mentioned.

When producing the polyisocyanurate foam of the present invention, various additives such as a foam stabilizer, a viscosity reducer, a surface material adhesion improver, a cell refiner, and the like may be further used. As the foam stabilizer, conventionally known nonionic surfactants, silicone surfactants, etc. can be used.

EXAMPLES The present invention will be specifically described below with reference to Examples, but the present invention is not limited to these Examples.

(raw material compound)
The compounds used as raw materials in the Examples and Comparative Examples are as follows.

Polyisocyanate compound: Crude MDI manufactured by Tosoh Corporation, product name "MR-200", NCO rate 31.3%

Polyol compound 1: polyester polyol obtained by dehydration condensation of orthophthalic acid and diethylene glycol, OHV 400 mgKOH/g, number average molecular weight 280.5
Polyol compound 2: polypropylene ether polyol (manufactured by Sanyo Kasei Co., Ltd., trade name "PP-400"), OHV 400 mgKOH/g, number average molecular weight 280.5
Polyol compound 3: diethylene glycol, OHV 1057 mgKOH/g, number average molecular weight 106

Flame retardant: Tris (1-chloro-2-propyl) phosphate (manufactured by Pro Flame, trade name "ProFlame-PC1389")
Foam stabilizer: Manufactured by Evonik Japan Co., Ltd., product number “B8443”
Trimerization catalyst: mixture of 65% potassium octylate and 35% potassium acetate

Physical blowing agent 1: cyclopentane (manufactured by Maruzen Sekiyu Co., Ltd., trade name "Marcasol FH")
Physical blowing agent 2: Hydrofluoroolefin (HFO) (manufactured by Honeywell, trade name "Solstice 1233zd (E)")

(manufacturing procedure)
An outline of the procedure for manufacturing the synthetic resin plate-like bodies of polyisocyanurate foams of Examples and Comparative Examples will be described below.

A polyol compound, a flame retardant, a foam stabilizer, and a catalyst were mixed to obtain a polyol side raw material liquid. A polyisocyanate compound whose temperature was also controlled at 15°C was added to the polyol side raw material liquid whose temperature was controlled at 15°C to obtain a raw material composition. A physical foaming agent was added to this raw material composition, and the raw material composition was quickly stirred for 10 seconds using a propeller stirrer at 5000 rpm to obtain a stirred product. The stirred material was placed in a box measuring 300 x 300 x 300 mm with an open top to produce a polyisocyanurate foam without a face material.

According to the above manufacturing procedure, synthetic resin plate-like bodies of polyisocyanurate foams of Examples and Comparative Examples were manufactured using the components and blending amounts as shown in the table below.

In addition, the physical properties and performance of the polyisocyanurate foams of Examples and Comparative Examples were evaluated by the methods described below. The results are also listed in the table.

(closed cell ratio)
Measured based on ASTM D2856.

(nurate rate)
The nurate rate was measured based on infrared absorption spectroscopy using a sample cut out at a depth of 3 mm from the surface of the foam. More specifically, the absorption peak area based on the nurate ring is divided by the sum of the absorption peak area based on the nurate ring, NH of urethane/urea, C=O of urea, and C=O of urethane/nurate. The ratio of the nurate ring to the entire partial structure was calculated by: More specifically, it was calculated as follows.
Nurate rate (%) = [a/(a+b+c+d)]×100
a: Absorption peak position based on nurate ring: 1410 cm ^-1 , area position: 1347.03 to 1464.67 cm ^-1 area b: Absorption peak position based on [NH] of urethane/urea: 1510 cm ^-1 , area Position: Area of 1460.81 to 1562.06 cm ^-1 c: Absorption peak position based on "C=O" of urea: 1595 cm ^-1 Area position: Area of 1566.88 to 1638.23 cm ^-1 d: Urethane. Absorption peak position based on "C=O" of Nurate: 1710 cm ^-1 , area position: 1636.3 to 1768.4 cm ^-1 area

(apparent density)
Measured based on JIS K7222.

(Evaluation of deformation recovery)
Measurements were made based on the ``Equipment Quality Judgment Standards (May 2014 Edition): Performance Test Method for Slit Materials'' established by the ``Independent Administrative Agency Urban Renaissance Agency.'' The specific test method is as follows. A synthetic resin plate specimen cut into 100 mm x 100 mm x 30 mm is compressed to 15 mm, and the load is returned to zero. This was repeated 5 times to reduce the load to 0, and then allowed to stand for 3 hours or more under conditions of 23 (±5)° C. and 50 (+20-10)% relative humidity, and the measured thickness was taken as the returned thickness. The loading speed was approximately 500 mm/min.

Those with deformation recovery of 80% or more were evaluated as "○", those with 70% or more but less than 80% were evaluated as "△", and those with less than 70% were evaluated as "x".

(Evaluation of fire resistance)
It was measured based on the evaluation test according to the following procedure.
A test in which a cylinder containing 75% to 85% by weight of liquefied butane and 15% to 25% by weight of liquefied propane was used, and a hand burner combined with a torch with a diameter of 22mm was used to cut the pieces into 200mm x 200mm x 30mm. Burn the body so that the flame of the burner hits the center of the body at a distance of 50 mm from the tip of the torch. A specimen with a thickness of 30 mm burns and the time required for the flame to penetrate the opposite side to the side that is hit by the flame is measured.

"◎" if the time required to penetrate is 6 minutes or more, "○" if it is 4 minutes or more but less than 6 minutes, "△" if it is 30 seconds or more and less than 4 minutes, "×" if it is less than 30 seconds. It was evaluated as follows.

(Evaluation of bending strength)
Measured based on JIS K7221-2. Specifically, a test specimen cut into 250 mm x 50 mm x 15 mm from the obtained polyisocyanurate foam was placed symmetrically on two cylindrical end supports with a radius of 15 mm located at a distance of 200 mm, and the cylindrical ends with a radius of 15 mm were placed symmetrically on two cylindrical end supports with a radius of 15 mm. A load is applied perpendicularly to the length direction of the test piece by moving the wedge at a constant speed of 20 mm/min using a universal testing machine. Bending strength is calculated using the maximum load until failure.

Those with bending strength (N/cm ² ) of 50 or more were evaluated as "◎", those with 15 or more were evaluated as "○", those with 10 or more and less than 15 were evaluated as "△", and those with less than 10 were evaluated as "x".

(Evaluation of thermal conductivity)
Measured based on JIS A9521.

Those with a thermal conductivity (W/m・K) of less than 0.024 were evaluated as "○", those with a thermal conductivity of 0.024 or more and less than 0.028 were evaluated as "△", and those with a thermal conductivity of 0.028 or more were evaluated as "x". .

Claims (2)

An earthquake-resistant slit material containing a synthetic resin plate-like body as a core material, which is used to be buried between a beam or a column and a wall in a concrete building,
The synthetic resin plate-shaped body is made of polyisocyanate having a deformation recovery property of 70% or more, a fire resistance of 30 seconds or more, and a thermal conductivity (JIS A9521) of less than 0.028 W/m·K. Seismic slit material containing nurate foam . An earthquake-resistant slit material containing a synthetic resin plate-like body as a core material, which is used to be buried between a beam or a column and a wall in a concrete building,
An earthquake-resistant slit material, wherein the synthetic resin plate-like body includes a polyisocyanurate foam having a closed cell ratio (ASTM D2856) of 85% or more and a nurate rate of 20 to 40%.