Two-component composition and spray-applied polyurethane foam for roofs

Abstract

The present invention provides a two-component composition that suppresses dripping during spray application, has high thermal insulation properties, excellent smoothness, and high interlayer adhesion strength for spray-applied polyurethane foam roofing. [Solution] A two-component composition for spray-applied polyurethane foam for roofs, comprising: liquid A containing a polyol, a catalyst, and a blowing agent; and liquid B containing an isocyanate compound, wherein the catalyst includes a foaming catalyst and a resinification catalyst (excluding a metal catalyst), and the blowing agent includes a hydrochlorofluoroolefin and does not include the metal catalyst which is the resinification catalyst, or a trimerizing catalyst.

Description

Technical Field

[0001] The present invention relates to a two-component composition and spray-foamed urethane foam for roofs.

Background Art

[0002] Conventionally, urethane foam has been widely used as a heat insulating material for houses and refrigerated warehouses, a material and structural material for construction and civil engineering, a frame for household appliances, etc., because it has characteristics such as excellent heat insulation, cushioning, moldability, and adhesiveness. Such urethane foam is being actively developed for the purpose of improving performance according to the application.

[0003] Patent Document 1 describes a polyol-containing composition for obtaining polyurethane foam by reacting with a polyisocyanate, which contains a polyol, an ammonium carboxylate having a specific structure, a heterocyclic compound having a nitrogen atom, a hydrofluoroolefin, and a foam stabilizer. Further, Patent Document 2 describes a foaming composition for non-combustible polyurethane foam, which is composed of a polyol, a composition A containing at least a trimerization catalyst as a catalyst, and a composition B containing a polyisocyanate. Further, Patent Document 3 describes a polyol composition containing a specific polyester polyol, a phosphate ester, a foaming agent, and a polyisocyanate, which is used for preparing a composition for producing polyurethane foam used in the production of polyurethane foam.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Patent Document 3

[0005] Panel construction and spray application are known methods for forming insulation and waterproofing layers on roofs and other structures made of polyurethane foam. However, panel construction is inferior to spray application in terms of insulation and waterproofing because heat and moisture can penetrate through the joints between the panels.

[0006] Furthermore, urea resin is applied (to a thickness of approximately 3 mm) to the polyurethane foam formed on the roofs of buildings to provide waterproofing and improve mechanical strength. However, when polyurethane foam is formed using a spray method, irregularities tend to form on the surface, resulting in uneven application of the urea resin and a decrease in thermal insulation, waterproofing, and mechanical strength. In this case, it is possible to improve thermal insulation, waterproofing, and mechanical strength by applying a thick layer of urea resin until the surface is smooth, but this increases the amount of urea resin used and thus increases costs. Furthermore, while slowing down the urethane reaction during the spray application method can suppress the occurrence of surface irregularities, it can lead to problems such as dripping during the spray application, resulting in poor workmanship, and lateral expansion, which reduces the adhesive strength between the roof substrate and the foamed urethane foam layer, as well as the adhesive strength between the foamed urethane foam layers themselves. Furthermore, while it is possible to suppress the occurrence of surface irregularities by using large amounts of plasticizers or liquid flame retardants, this can lead to problems such as the plasticizers or liquid flame retardants bleeding out from the surface of the polyurethane foam, reducing the adhesive strength with the urea resin. Furthermore, while it is possible to suppress the occurrence of surface irregularities by controlling the foaming ratio, this is not practical from an economic standpoint because it increases the amount of resin used and thus the cost.

[0007] The present invention has been made in view of the above circumstances, and aims to provide a two-component composition that can form a spray-applied polyurethane foam for roofs that suppresses dripping during spray application, has high thermal insulation properties, excellent smoothness, and high interlayer adhesion strength of the polyurethane foam, and a spray-applied polyurethane foam for roofs obtained by foaming a mixture of the two-component composition. [Means for solving the problem]

[0008] The present invention is based on the discovery that by using a two-component composition comprising liquid A containing a polyol, a catalyst, and a blowing agent, and liquid B containing an isocyanate compound, wherein the catalyst includes a foaming catalyst and a resinification catalyst (excluding a metal catalyst), and the blowing agent includes a hydrochlorofluoroolefin, and does not include the metal catalyst that is the resinification catalyst or the trimerizing catalyst, it is possible to form a spray-applied polyurethane foam for roofs that suppresses dripping during spray application, has high thermal insulation properties, excellent smoothness, and high interlayer adhesion strength of the polyurethane foam.

[0009] The present invention provides the following means. [1] A two-component composition for spray-on polyurethane foam for roofing, Solution A contains a polyol, a catalyst, and a blowing agent, It consists of solution B containing an isocyanate compound, The catalyst includes a foaming catalyst and a resinifying catalyst (excluding a metal catalyst), The foaming agent comprises a hydrochlorofluoroolefin, A two-component composition that does not contain the metal catalyst, which is a resinification catalyst, or the trimerizing catalyst. [2] Mix the liquid A and the liquid B and foam to obtain a foamed product. A two-component composition of [1], wherein the foam is sprayed onto a 450mm square, 12mm thick JAS standard ordinary plywood of class 1, grade 1 by the following (spraying method), forming a spray-applied polyurethane foam with a total thickness of 60mm, and the surface smoothness obtained by the following (method for calculating surface smoothness) is less than 1.28. (Spraying method) Using a spray gun, under the conditions of an ambient temperature of 20°C ± 2°C, a distance of 700 mm between the spray gun and the JAS standard ordinary plywood Class 1 Grade 1, and a discharge rate of 0.45 to 11.3 kg / min, a first layer with a thickness of 20 mm is sprayed, left to stand for 5 minutes, then a second layer with a thickness of 20 mm is sprayed on top of the first layer to create a laminate, left to stand for another 5 minutes, and then a third layer with a thickness of 20 mm is sprayed on top of the second layer to create a laminate. (Method for calculating surface smoothness) After cutting out the center of the sprayed polyurethane foam obtained by the above (spraying method) to a size of 100 mm square, the 100 mm square sprayed polyurethane foam is divided into four parts to form test pieces 1 to 4. For each of the test pieces 1 to 4, the height (H) of the highest point (convex part) and the depth (D) of the lowest point (concave part) on the surface are measured, and the value ((H) / (D)) is calculated by dividing (H) by (D). The average value of ((H) / (D)) for the test pieces 1 to 4 is defined as the surface smoothness. [3] Mix the liquid A and the liquid B and foam to obtain a foamed product. When the aforementioned foam is sprayed onto a 450mm square, 12mm thick JAS standard ordinary plywood of class 1, grade 1, using the following (spraying method), to form a spray-applied polyurethane foam with a total thickness of 60mm, A two-component composition according to [1] or [2], wherein the adhesive strength between the spray-applied polyurethane foam and the JAS standard ordinary plywood Class 1, Grade 1 is 0.2 MPa or more. (Spraying method) Using a spray gun, under the conditions of an ambient temperature of 20°C ± 2°C, a distance of 700 mm between the spray gun and the JAS standard ordinary plywood Class 1 Grade 1, and a discharge rate of 0.45 to 11.3 kg / min, a first layer with a thickness of 20 mm is sprayed, left to stand for 5 minutes, then a second layer with a thickness of 20 mm is sprayed on top of the first layer to create a laminate, left to stand for another 5 minutes, and then a third layer with a thickness of 20 mm is sprayed on top of the second layer to create a laminate. [4] Mix the liquid A and the liquid B and foam to obtain a foamed product. When the aforementioned foam is sprayed onto a 450mm square, 12mm thick JAS standard ordinary plywood of class 1, grade 1, using the following (spraying method), to form a spray-applied polyurethane foam with a total thickness of 60mm, The two-component compositions [1] to [3] wherein the compressive strength of the sprayed polyurethane foam in the parallel and perpendicular directions is 0.2 MPa or more, respectively. (Spraying method) Using a spray gun, under the conditions of an ambient temperature of 20°C ± 2°C, a distance of 700 mm between the spray gun and the JAS standard ordinary plywood Class 1 Grade 1, and a discharge rate of 0.45 to 11.3 kg / min, a first layer with a thickness of 20 mm is sprayed, left to stand for 5 minutes, then a second layer with a thickness of 20 mm is sprayed on top of the first layer to create a laminate, left to stand for another 5 minutes, and then a third layer with a thickness of 20 mm is sprayed on top of the second layer to create a laminate. [5] The resin catalyst comprises a primary amine catalyst, and is a two-component composition according to any of [1] to [4]. [6] The resin catalyst is a two-component composition of any one of [1] to [5], comprising an imidazole catalyst. [7] A two-component composition according to any one of [1] to [6], wherein the total content of the foaming catalyst and the resinifying catalyst is 1 to 30 parts by mass per 100 parts by mass of the polyol. [8] A two-component composition according to any one of [1] to [7], wherein liquid A contains a foam stabilizer. [9] The two-component composition of [8], wherein the foaming agent contains water, and the water content is 2.0 parts by mass or less per 100 parts by mass of the polyol.

[10] A spray-applied polyurethane foam for roofing, comprising a mixture containing a polyol, a catalyst, a blowing agent, and an isocyanate compound, The catalyst includes a foaming catalyst and a resinifying catalyst (excluding a metal catalyst), The foaming agent comprises a hydrochlorofluoroolefin, A spray-applied polyurethane foam for roofing that does not contain the aforementioned metal catalyst, which is a resinification catalyst, or the trimerization catalyst. [Effects of the Invention]

[0010] According to the present invention, it is possible to provide a two-component composition capable of forming a spray-foamed urethane foam for roofing that suppresses the occurrence of dripping during the spraying process, has high heat insulation, excellent smoothness, and high adhesive strength between layers of the foamed urethane foam, and a spray-foamed urethane foam for roofing formed by foaming a mixed liquid composed of the two-component composition.

Brief Description of Drawings

[0011] [Figure 1] It is a graph (rise profile) showing the change amount of the height of the foamed material from when foaming (expansion) starts to when it stops in a foamed material where foaming is in one stage [Figure 2] It is a graph (rise profile) showing the change amount of the height of the foamed material from when foaming (expansion) starts to when it stops in a foamed material where foaming is in two stages

Embodiments for Carrying Out the Invention

[0012] The definitions and meanings of terms and notations in this specification are shown below. A numerical range represented using "~" means that the numerical values before and after "~" are the lower limit value and the upper limit value. For a numerical range (for example, a range such as content), the stepwise-described lower limit value and upper limit value may be combined independently. The lower limit value and upper limit value of the numerical range may be replaced with the numerical values described in the examples. In this specification, "lateral expansion" refers to a phenomenon in which when a foamed material is sprayed onto a spraying target object, foaming in the lateral direction further progresses from the state where foaming in the lateral direction begins to converge, meaning that foaming progresses in two stages (two-stage foaming).

[0013] [Two-component composition] The two-component composition of an embodiment of the present invention (hereinafter also referred to as the present embodiment) is a two-component composition for spray-foamed urethane foam for roofs, and comprises a liquid A containing a polyol, a catalyst, and a foaming agent, and a liquid B containing an isocyanate compound. The catalyst includes a foaming catalyst and a resinification catalyst (excluding metal catalysts), the foaming agent includes a hydrochlorofluorolefin, and does not include the metal catalyst which is a resinification catalyst and a trimerization catalyst.

[0014] The two-component composition of the present embodiment can form a foamed urethane foam by spraying. Since the spray-foamed urethane foam formed by spraying has no joints between panels as in the panel method, it has high heat insulation and shielding properties. Further, by having the above configuration, the two-component composition of the present embodiment promotes the reaction of the skin portion between urethane layers and suppresses lateral expansion when spray-foamed, so that dripping does not occur during the spraying process. Furthermore, since the surface of the spray-foamed urethane foam formed from the two-component composition has smoothness (few surface irregularities), the amount of urea resin used when forming the heat insulation layer for the roof can be reduced, and since it is not necessary to increase the number of spraying times to obtain smoothness, the construction period can also be shortened. In addition, since the spray-foamed urethane foam formed from the two-component composition has high adhesive strength between the foamed urethane foam layers, poor adhesion to the roof substrate and delamination between layers do not occur.

[0015] <Liquid A> The liquid A of the present embodiment contains a polyol, a catalyst, and a foaming agent.

[0016] 〔Polyol〕 The polyol contained in the liquid A of the present embodiment is an alcohol having two or more hydroxyl groups, and generates a urethane resin by a polyaddition reaction with the polyisocyanate compound contained in the liquid B. The polyol may be a single type or two or more types may be used in combination.

[0017] From the viewpoint of forming a spray-applied polyurethane foam for roofing that has high heat insulation properties and excellent smoothness, the polyol content in liquid A is preferably 20 parts by mass or more, more preferably 30 parts by mass or more, and even more preferably 40 parts by mass or more, per 100 parts by mass of liquid A, and from the viewpoint of cost, it is preferably 90 parts by mass or less, more preferably 85 parts by mass or less, and even more preferably 80 parts by mass or less. That is, the polyol content in liquid A is preferably 20 to 90 parts by mass, more preferably 30 to 85 parts by mass, and even more preferably 40 to 80 parts by mass, per 100 parts by mass of liquid A.

[0018] Examples of polyols include polyester polyols and polyether polyols.

[0019] From the viewpoint of forming a spray-applied polyurethane foam for roofs that suppresses dripping during spray application, has high heat insulation properties, excellent smoothness, and high interlayer adhesion strength of the polyurethane foam, the hydroxyl value of the polyester polyol is preferably 100 to 600 mg KOH / g, more preferably 200 to 500 mg KOH / g, and even more preferably 250 to 400 mg KOH / g.

[0020] Examples of polyester polyols include polymers obtained by dehydration condensation of polybasic acids (e.g., adipic acid, azelaic acid, sebacic acid, succinic acid, phthalic acid, isophthalic acid, terephthalic acid, etc.) and diols (e.g., ethylene glycol, propanediol, butanediol, diethylene glycol, dipropylene glycol, trimethylene glycol, tetramethylene glycol, hexamethylene glycol, decamethylene glycol, neopentyl glycol, 3-methyl-1,5-pentanediol, glycerin, trimethylolpropane, pentaerythritol, sorbitol, bisphenol A, etc.), and condensates of hydroxycarboxylic acids (castor oil, reaction products of castor oil and ethylene glycol, etc.) and the aforementioned diols. Polyester polyols may be used individually or in combination of two or more types.

[0021] From the viewpoint of forming a spray-applied polyurethane foam for roofs that suppresses dripping during spray application, has high thermal insulation properties, excellent smoothness, and high interlayer adhesion strength of the polyurethane foam, aromatic polyester polyols are preferred.

[0022] From the viewpoint of forming a spray-applied polyurethane foam for roofing that has high heat insulation properties and excellent smoothness, the content of aromatic polyester polyol in the polyol is preferably 10 parts by mass or more, more preferably 15 parts by mass or more, and even more preferably 20 parts by mass or more, per 100 parts by mass of polyol, and from the viewpoint of cost, preferably 60 parts by mass or less, more preferably 50 parts by mass or less, and even more preferably 40 parts by mass or less. In other words, the content of aromatic polyester polyol in the polyol is preferably 10 to 60 parts by mass, more preferably 15 to 50 parts by mass, and even more preferably 20 to 40 parts by mass, per 100 parts by mass of polyol.

[0023] Examples of polyether polyols include polymers obtained by ring-opening polymerization of alkylene oxides such as ethylene oxide, propylene oxide, and butylene oxide, or tetrahydrofuran, to an initiator having two or more active hydrogen atoms in one molecule. Examples of initiators include diols such as ethylene glycol, propylene glycol, butylene glycol, 1,6-hexanediol, and bisphenol A; triols such as glycerin and trimethylolpropane; tetraols such as pentaerythritol; and amines such as ethylenediamine and butylenediamine. Polyether polyols may be used alone or in combination of two or more.

[0024] The polyether polyol is preferably a Mannich-type polyol. Mannich polyols are aromatic polyether polyols obtained by addition polymerization of alkylene oxide to aromatic polyols, which are products (Mannich condensates) obtained by the Mannich reaction of phenol compounds, aldehyde compounds, and amine compounds. Examples of the phenolic compounds commonly used include phenol, cresol, nonylphenol, and other alkylphenols. Examples of commonly used aldehyde compounds include formaldehyde and acetaldehyde. Examples of the amine compounds include aliphatic primary or secondary monoamines, and commonly used examples include alkanolamines such as monoethanolamine, diethanolamine, and 1-amino-2-propanol; and alkylamines such as methylamine and diethylamine. Examples of commonly used alkylene oxides include ethylene oxide, propylene oxide, and butylene oxide. Mannich polyols can be produced specifically by the manufacturing methods described in International Publication No. 2010 / 147091, etc.

[0025] From the viewpoint of forming a spray-applied polyurethane foam for roofing that has high thermal insulation properties and excellent smoothness, the content of Mannich-type polyol in the polyol is preferably 20 parts by mass or more, more preferably 30 parts by mass or more, and even more preferably 35 parts by mass or more, per 100 parts by mass of polyol, and from the viewpoint of cost, preferably 80 parts by mass or less, more preferably 70 parts by mass or less, and even more preferably 60 parts by mass or less. In other words, the content of Mannich-type polyol in the polyol is preferably 20 to 80 parts by mass, more preferably 30 to 70 parts by mass, and even more preferably 35 to 60 parts by mass, per 100 parts by mass of polyol.

[0026] From the viewpoint of forming a spray-applied polyurethane foam for roofing that has high thermal insulation properties and excellent smoothness, it is more preferable that the polyol includes an aromatic polyester polyol and a Mannich-type polyol. Furthermore, from the viewpoint of suppressing dripping during spray application, it is preferable that liquid A contains an ethylenediamine-based polyol using ethylenediamine as an initiator.

[0027] 〔catalyst〕 The catalyst includes a foaming catalyst and a resinification catalyst (excluding metal catalysts). Furthermore, the two-component composition of this embodiment does not include the aforementioned metal catalyst, which is a resinification catalyst, or a trimerizing catalyst. When a trimerizing catalyst is included as a catalyst, the reaction heat during urethane formation reaches around 80°C, which promotes the wetting reaction of residual isocyanate compounds. However, when a trimerizing catalyst is included, the urethane formation reaction is slow, resulting in low reaction heat within the laminated polyurethane foam, making wetting difficult. For this reason, two-stage foaming occurs, causing lateral expansion of the polyurethane foam. As a result, dripping is more likely to occur during spray application, and the adhesive strength between layers of polyurethane foam decreases, making delamination more likely. Furthermore, if a metal catalyst, which is a resinification catalyst, is included as a catalyst, the initial activity of the urethane formation reaction becomes excessive, causing irregularities on the surface and reducing the surface smoothness. In this embodiment, by not including a metal catalyst and a trimerizing catalyst, which are resinification catalysts, the occurrence of two-stage foaming and lateral elongation of the foamed urethane foam is suppressed, the occurrence of dripping during spray application is suppressed, and a sprayed foamed urethane foam with high interlayer adhesion strength and excellent smoothness can be formed.

[0028] (Foaming catalyst) The foaming catalyst moderately activates the reaction between water and isocyanates (the so-called foaming reaction) and moderately promotes urea formation. Examples of foaming catalysts include acid-blocked foaming catalysts obtained by neutralizing chain-like tertiary amines such as bis(2-dimethylaminoethyl) ether, bis(2-morpholinoethyl) ether, and N,N-dimethylalkylamines, or tertiary amine resins, with a carboxylic acid. Resin-forming catalysts blocked by the aforementioned acid can also be cited as catalysts other than those described above. From the viewpoint of forming a spray-applied polyurethane foam for roofing that suppresses dripping during spray application, has excellent smoothness, and has high interlayer adhesion strength, a chain-like tertiary amine is preferred as the foaming catalyst, a chain-like tertiary amine having a morpholine skeleton is more preferred, and bis(2-morpholinoethyl) ether is even more preferred.

[0029] From the viewpoint of forming a spray-applied polyurethane foam for roofs that suppresses dripping during the spraying method, has excellent smoothness, and has high interlayer adhesion strength of the foamed polyurethane foam, the content of the foaming catalyst in liquid A is preferably 0.1 parts by mass or more, more preferably 1.0 part by mass or more, even more preferably 2.0 parts by mass or more, preferably 12 parts by mass or less, more preferably 10 parts by mass or less, and even more preferably 8 parts by mass or less, per 100 parts by mass of polyol. In other words, the content of the foaming catalyst in liquid A is preferably 0.1 to 12 parts by mass, more preferably 1.0 to 10 parts by mass, and even more preferably 2.0 to 8 parts by mass, per 100 parts by mass of polyol.

[0030] (Resin-based catalyst) The resin catalyst moderately activates the reaction between water and isocyanates, moderately promoting urethane formation. In this embodiment, the resin catalyst does not contain a metal catalyst. The resin catalyst may be used alone or in combination of two or more types. From the viewpoint of forming a spray-applied polyurethane foam for roofing that suppresses dripping during spray application, has excellent smoothness, and has high interlayer adhesion strength, it is preferable that the resin catalyst contains at least one selected from imidazole catalysts, primary amine catalysts, and tertiary amine catalysts. In one embodiment of the present invention, the resin catalyst preferably comprises an imidazole catalyst, more preferably comprises an imidazole catalyst and a primary amine catalyst, or comprises an imidazole catalyst and a tertiary amine catalyst, and even more preferably comprises an imidazole catalyst, a primary amine catalyst and a tertiary amine catalyst.

[0031] Examples of imidazole catalysts include imidazole, 1-methylimidazole, 2-methylimidazole, 1,2-dimethylimidazole, 2-ethyl-4-methylimidazole, 2-isopropylimidazole, 1-isobutyl-2-methylimidazole, 2-undecylimidazole, 2-heptadecylimidazole, 2-phenylimidazole, and 2-phenyl-4-methylimidazole. Among these, 1,2-dimethylimidazole is preferred from the viewpoint of suppressing dripping during spray application, having excellent smoothness, and forming a spray-applied polyurethane foam for roofs with high interlayer adhesion strength.

[0032] Examples of primary amine catalysts include diethylmethylbenzenediamine.

[0033] Examples of tertiary amine catalysts include dimethylethanolamine, triethylenediamine, N-methyldicyclohexylamine, N,N-dimethylcyclohexylamine, N,N,N',N”,N”-pentamethyldiethylenetriamine, bis(2-dimethylaminoethyl) ether, and 1,4-diazabicyclo[2.2.2]octane. Among these, N-methyldicyclohexylamine is preferred from the viewpoint of suppressing dripping during spray application, having excellent smoothness, and forming a spray-applied polyurethane foam for roofs with high interlayer adhesion strength.

[0034] In one embodiment of the present invention, the resinification catalyst preferably comprises 1,2-dimethylimidazole, diethylmethylbenzenediamine, and N-methyldicyclohexylamine.

[0035] From the viewpoint of forming a spray-applied polyurethane foam for roofs that suppresses dripping during the spraying method, has excellent smoothness, and has high interlayer adhesion strength of the polyurethane foam, the content of the resinification catalyst in liquid A is preferably 1.0 part by mass or more, more preferably 3.0 parts by mass or more, even more preferably 5.0 parts by mass or more, preferably 20 parts by mass or less, more preferably 15 parts by mass or less, and even more preferably 12 parts by mass or less, per 100 parts by mass of polyol. In other words, the content of the resinification catalyst in liquid A is preferably 1.0 to 20 parts by mass, more preferably 3.0 to 15 parts by mass, and even more preferably 5.0 to 12 parts by mass, per 100 parts by mass of polyol.

[0036] The imidazole catalyst content in liquid A is preferably 0.5 parts by mass or more, more preferably 1.0 part by mass or more, even more preferably 1.5 parts by mass or more, preferably 10 parts by mass or less, more preferably 7 parts by mass or less, and even more preferably 5 parts by mass or less, per 100 parts by mass of polyol, from the viewpoint of suppressing dripping during the spraying method, having excellent smoothness, and forming a spray-applied polyurethane foam for roofs with high interlayer adhesion strength of the polyurethane foam. In other words, the imidazole catalyst content in liquid A is preferably 0.5 to 10 parts by mass, more preferably 1.0 to 7 parts by mass, and even more preferably 1.5 to 5 parts by mass, per 100 parts by mass of polyol.

[0037] The content of the primary amine catalyst in liquid A is preferably 0.5 parts by mass or more, more preferably 1.0 part by mass or more, even more preferably 1.5 parts by mass or more, preferably 10 parts by mass or less, more preferably 7 parts by mass or less, and even more preferably 5 parts by mass or less, per 100 parts by mass of polyol, from the viewpoint of suppressing dripping during the spraying method, having excellent smoothness, and forming a spray-applied polyurethane foam for roofs with high interlayer adhesion strength of the polyurethane foam. In other words, the content of the primary amine in liquid A is preferably 0.5 to 10 parts by mass, more preferably 1.0 to 7 parts by mass, and even more preferably 1.5 to 5 parts by mass, per 100 parts by mass of polyol.

[0038] The content of the tertiary amine catalyst in liquid A is preferably 0.5 parts by mass or more, more preferably 1.0 part by mass or more, even more preferably 1.5 parts by mass or more, preferably 10 parts by mass or less, more preferably 7 parts by mass or less, and even more preferably 5 parts by mass or less, per 100 parts by mass of polyol, from the viewpoint of suppressing dripping during the spraying method, having excellent smoothness, and forming a spray-applied polyurethane foam for roofs with high interlayer adhesion strength of the polyurethane foam. In other words, the content of the tertiary amine in liquid A is preferably 0.5 to 10 parts by mass, more preferably 1.0 to 7 parts by mass, and even more preferably 1.5 to 5 parts by mass, per 100 parts by mass of polyol.

[0039] The ratio (by mass) of the imidazole catalyst to the primary amine catalyst in liquid A is preferably 30:70 to 70:30, more preferably 40:60 to 60:40, and even more preferably 45:55 to 55:45, from the viewpoint of forming a spray-applied polyurethane foam for roofs that suppresses dripping during the spraying method, has excellent smoothness, and has high interlayer adhesion strength of the polyurethane foam.

[0040] The ratio (by mass) of the imidazole catalyst to the tertiary amine catalyst in liquid A is preferably 35:65 to 75:25, more preferably 45:35 to 65:35, and even more preferably 50:50 to 60:40, from the viewpoint of suppressing dripping during the spraying method, having excellent smoothness, and forming a spray-applied polyurethane foam for roofs with high interlayer adhesion strength.

[0041] The total content of the foaming catalyst and the resinifying catalyst in liquid A is preferably 1 part by mass or more, more preferably 5 parts by mass or more, even more preferably 7 parts by mass or more, preferably 30 parts by mass or less, more preferably 25 parts by mass or less, and even more preferably 20 parts by mass or less, per 100 parts by mass of polyol, from the viewpoint of suppressing dripping during the spraying method, having excellent smoothness, and forming a spray-applied foamed polyurethane foam for roofs with high interlayer adhesion strength of the foamed polyurethane foam. In other words, the total content of the foaming catalyst and the resinifying catalyst in liquid A is preferably 1 to 30 parts by mass, more preferably 5 to 25 parts by mass, and even more preferably 7 to 20 parts by mass, per 100 parts by mass of polyol.

[0042] [Foaming agent] The blowing agent generates gas through the exothermic reaction of a resinification reaction in which a polyol and polyisocyanate react to form urethane bonds, thereby causing the urethane resin to foam, and contains hydrochlorofluoroolefin (HCFO). The blowing agent may contain other blowing agents, or it may not. The blowing agent may consist solely of hydrochlorofluoroolefin, or it may be used in combination with hydrochlorofluoroolefin and one or more other blowing agents.

[0043] Examples of blowing agents other than hydrochlorofluoroolefins include water, hydrofluoroolefins (HFOs), and hydrofluorocarbons (HFCs). From the viewpoint of suppressing a decrease in catalytic activity, it is preferable that the blowing agent contains water.

[0044] Specific examples of foaming agents other than water include trans-1,3,3,3-tetrafluoropropene (trans-HFO-1234ze(E)), 1,1,1,4,4,4-hexafluoro-2-butene (HFO-1336mzz), and trans-1-chloro-3,3,3-trifluoropropene (HCFO-1233zd(E)). Of these, HCFO-1233zd(E) is preferred.

[0045] From the viewpoint of moderately foaming the urethane resin, the content of the foaming agent in liquid A is preferably 10 parts by mass or more, more preferably 15 parts by mass or more, even more preferably 20 parts by mass or more, preferably 40 parts by mass or less, more preferably 35 parts by mass or less, and even more preferably 30 parts by mass or less, per 100 parts by mass of polyol. In other words, from the viewpoint of moderately foaming the urethane resin, the content of the foaming agent in liquid A is preferably 10 to 40 parts by mass, more preferably 15 to 35 parts by mass, and even more preferably 20 to 30 parts by mass, per 100 parts by mass of polyol.

[0046] Furthermore, water reacts with the isocyanate groups of polyisocyanate to form urea bonds, resulting in a foaming reaction that generates carbon dioxide. While it is preferable to include water as a blowing agent to promote foaming in the initial stages of the urethane foam formation reaction, excessive amounts can make the foamed urethane foam brittle and reduce the adhesive strength between layers of the foamed urethane foam. For these reasons, the water content in solution A is preferably 0.1 parts by mass or more, more preferably 0.3 parts by mass or more, even more preferably 0.5 parts by mass or more, preferably 2.0 parts by mass or less, more preferably 1.8 parts by mass or less, and even more preferably 1.6 parts by mass or less, per 100 parts by mass of polyol. In other words, the water content in solution A is preferably 0.1 to 2.0 parts by mass, more preferably 0.3 to 1.8 parts by mass, and even more preferably 0.5 to 1.6 parts by mass, per 100 parts by mass of polyol.

[0047] [Foam stabilizer] From the viewpoint of improving the compatibility of each component in the two-component composition and homogeneously forming cells in the foamed polyurethane foam, and from the viewpoint of trapping the gas generated by foaming, forming independent bubbles inside the foam, and forming a sprayed foamed polyurethane foam with high thermal insulation properties, it is preferable that liquid A contains a foam stabilizer. The foam stabilizer may be a single type or two or more types may be used in combination. Generally, silicone-based foam stabilizers are preferred, such as siloxane-polyalkylene oxide copolymers.

[0048] The content of the foam stabilizer in Liquid A can be appropriately set according to the type of urethane resin and the like, and is preferably 0.1 to 10.0 parts by mass, more preferably 0.3 to 8.0 parts by mass, and still more preferably 0.5 to 5.0 parts by mass in 100 parts by mass of Liquid A.

[0049] 〔Flame retardant〕 From the viewpoint of imparting flame retardancy to the spray-foamed urethane foam, Liquid A may contain a flame retardant. Examples of the flame retardant include tris-dichloropropyl phosphate, tris-chloroethyl phosphate, tris-chloropropyl phosphate, dibromoneopentyl alcohol, tribromoneopentyl alcohol, and the like.

[0050] The content of the foam stabilizer in Liquid A can be appropriately set according to the type of urethane resin and the like, and is preferably 1.0 to 50.0 parts by mass, more preferably 5.0 to 40.0 parts by mass, and still more preferably 10.0 to 30.0 parts by mass in 100 parts by mass of Liquid A.

[0051] 〔Other components〕 Liquid A may or may not contain, as necessary and within a range not interfering with the effects of the present invention, additives such as fillers, colorants, antioxidants, dispersants, thixotropic agents, and also solvents and the like. When Liquid A contains other components, the content of the other components in Liquid A is preferably 10% by mass or less, more preferably 5% by mass or less, and still more preferably 1% by mass or less.

[0052] The production method of Liquid A in the present embodiment is not particularly limited. By blending the above-described respective components contained in Liquid A and stirring and mixing at 15 to 40°C for 20 seconds to 20 minutes using a known stirring device such as a homodisper or a planetary stirrer, Liquid A can be produced.

[0053] <Liquid B> Liquid B of the present embodiment contains an isocyanate compound.

[0054] [Isocyanate compounds] The isocyanate compound of this embodiment has two or more isocyanate groups and produces a urethane resin by polyaddition reaction with a polyol. The isocyanate compound may be either an aromatic polyisocyanate or an aliphatic polyisocyanate, and may be used alone or in combination of two or more types.

[0055] Examples of aromatic polyisocyanates include diphenyl ether-2,4'-diisocyanate, diphenyl ether-4,4'-diisocyanate, torylene-2,4-diisocyanate, torylene-2,6-diisocyanate, 4,6-dimethyl-1,3-phenylenediisocyanate, monomeric MDIs such as 2,2'-diphenylmethane diisocyanate (2,2'-MDI), 2,4'-diphenylmethane diisocyanate (2,4'-MDI), and 4,4'-diphenylmethane diisocyanate (4,4'-MDI), as well as polymethylene polyphenyl polyisocyanate (crude MDI or polymeric MDI), 3,3'-dimethyl-4,4'-biphenylenediisocyanate, and m-xylylene diisocyanate. The aliphatic polyisocyanate can be either acyclic or alicyclic polyisocyanate, such as tetramethylene diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, and dicyclohexylmethane diisocyanate. Of these, monomeric MDI such as 2,2'-MDI, 2,4'-MDI, and 4,4'-MDI, crude MDI, and polymeric MDI are preferred from the viewpoint of forming a highly reactive and heat-insulating spray polyurethane foam for roofs. Furthermore, from the viewpoint of availability and cost, crude MDI and polymeric MDI are more preferred, and polymeric MDI is even more preferred.

[0056] The content of the isocyanate compound in liquid B is preferably 80 to 100 parts by mass, more preferably 90 to 100 parts by mass, still more preferably 95 to 100 parts by mass in 100 parts by mass of liquid B, from the viewpoints of ease of handling during mixing preparation and forming a spray foam urethane foam for roofs with high heat insulation properties.

[0057] The isocyanate index of the isocyanate compound when reacting liquid A and liquid B to obtain the spray foam urethane foam is not particularly limited and is usually around 100. However, from the viewpoints of suppressing the occurrence of liquid dripping during the spraying process, having high heat insulation properties, excellent smoothness, and high adhesive strength between layers of the foam urethane foam, it is preferably 80 to 120, more preferably 82 to 115, still more preferably 84 to 110.

[0058] 〔Other components〕 Liquid B may or may not contain additives such as fillers, colorants, antioxidants, dispersants, thixotropic agents, etc., and solvents, etc., within the range that does not hinder the effects of the present invention, if necessary. When liquid B contains other components, the content of the other components in liquid B is preferably 10% by mass or less, more preferably 5% by mass or less, still more preferably 1% by mass or less.

[0059] <Ratio of liquid A and liquid B> The mass ratio of liquid A and liquid B in the two-component composition (liquid A: liquid B) is preferably 20:80 to 80:20, more preferably 30:70 to 70:30, still more preferably 40:60 to 60:40, from the viewpoints of suppressing the occurrence of liquid dripping during the spraying process, having high heat insulation properties, excellent smoothness, and high adhesive strength between layers of the spray foam urethane foam.

[0060] <Physical properties> The two-component composition of this embodiment is obtained by mixing liquid A and liquid B and foaming to obtain a foam, and then spraying the foam onto a 450 mm square, 12 mm thick JAS standard ordinary plywood of class 1, grade 1, etc., using the method described below (spraying method) to form a spray-applied polyurethane foam with a total thickness of 60 mm. The surface smoothness obtained using the method described below (method for calculating surface smoothness) is preferably less than 1.28, more preferably 1.20 or less, and even more preferably 1.15 or less. The lower the surface smoothness, the better, but from the viewpoint of productivity, it may be 0.50 or more. (Spraying method) Using a spray gun, under the conditions of an ambient temperature of 20°C ± 2°C, a distance of 700 mm between the spray gun and the JAS standard ordinary plywood Class 1 Grade 1, and a discharge rate of 0.45 to 11.3 kg / min, a first layer with a thickness of 20 mm is sprayed, left to stand for 5 minutes, then a second layer with a thickness of 20 mm is sprayed on top of the first layer to create a laminate, left to stand for another 5 minutes, and then a third layer with a thickness of 20 mm is sprayed on top of the second layer to create a laminate. (Method for calculating surface smoothness) After cutting out the center of the sprayed polyurethane foam obtained by the above (spraying method) to a size of 100 mm square, the 100 mm square sprayed polyurethane foam is divided into four parts to form test pieces 1 to 4. For each of the test pieces 1 to 4, the height (H) of the highest point (convex part) and the depth (D) of the lowest point (concave part) on the surface are measured, and the value ((H) / (D)) is calculated by dividing (H) by (D). The average value of ((H) / (D)) for the test pieces 1 to 4 is defined as the surface smoothness. The first, second, and third layers are preferably formed in 3 to 15 seconds, respectively.

[0061] In this embodiment, when a two-component composition is prepared by mixing liquid A and liquid B and foaming to obtain a foam, and then spraying the foam onto a 450 mm square, 12 mm thick JAS standard ordinary plywood (Class 1, Grade 1, etc.) using the method described below (spraying method) to form a spray-applied polyurethane foam with a total thickness of 60 mm, the adhesive strength between the spray-applied polyurethane foam and the JAS standard ordinary plywood (Class 1, Grade 1, etc.) is preferably 0.20 MPa or higher, more preferably 0.22 MPa or higher, and even more preferably 0.24 MPa or higher. The adhesive strength between the spray-applied polyurethane foam and the JAS standard ordinary plywood (Class 1, Grade 1, etc.) is preferable as high as possible, but may be 0.35 MPa or lower. (Spraying method) Using a spray gun, under the conditions of an ambient temperature of 20°C ± 2°C, a distance of 700 mm between the spray gun and the JAS standard ordinary plywood Class 1 Grade 1, and a discharge rate of 0.45 to 11.3 kg / min, a first layer with a thickness of 20 mm is sprayed, left to stand for 5 minutes, then a second layer with a thickness of 20 mm is sprayed on top of the first layer to create a laminate, left to stand for another 5 minutes, and then a third layer with a thickness of 20 mm is sprayed on top of the second layer to create a laminate. The first, second, and third layers are preferably formed in 3 to 15 seconds, respectively. Furthermore, the adhesive strength is a value measured in accordance with JIS A 9526:2022, and specifically, it is measured by the method described in the examples.

[0062] In this embodiment, when the two-component composition is prepared by mixing liquid A and liquid B and foaming to obtain a foam, and then spraying the foam onto a 450 mm square, 12 mm thick JAS standard ordinary plywood of class 1 or higher using the method described below (spraying method) to form a spray-applied polyurethane foam with a total thickness of 20 mm, the compressive strength of the spray-applied polyurethane foam in the parallel and perpendicular directions is preferably 0.2 MPa or higher, more preferably 0.21 MPa or higher, and even more preferably 0.22 MPa or higher. The compressive strength of the spray-applied polyurethane foam in the parallel and perpendicular directions is preferable as much as possible, but may be 0.45 MPa or lower, respectively. (Spraying method) Using a spray gun, under the conditions of an ambient temperature of 20°C ± 2°C, a distance of 700 mm between the spray gun and the JAS standard ordinary plywood Class 1 Grade 1, and a discharge rate of 0.45 to 11.3 kg / min, a first layer with a thickness of 20 mm is sprayed, left to stand for 5 minutes, then a second layer with a thickness of 20 mm is sprayed on top of the first layer to create a laminate, left to stand for another 5 minutes, and then a third layer with a thickness of 20 mm is sprayed on top of the second layer to create a laminate. The first, second, and third layers are preferably formed in 3 to 15 seconds, respectively. Furthermore, the compressive strength is a value measured in accordance with JIS A 9526:2015, and specifically, it is measured by the method described in the examples.

[0063] [Spray-applied polyurethane foam for roofs] The spray-applied polyurethane foam for roofs of this embodiment is a spray-applied polyurethane foam for roofs obtained by foaming a mixed liquid containing a polyol, a catalyst, a blowing agent, and an isocyanate compound, wherein the catalyst includes a foaming catalyst and a resinification catalyst (excluding a metal catalyst), and the blowing agent includes a hydrochlorofluoroolefin and does not include the metal catalyst which is the resinification catalyst or the trimerizing catalyst. A mixture containing a polyol, a catalyst, a blowing agent, and an isocyanate compound is obtained by mixing the above-mentioned solution A and solution B. By using a mixed liquid having the above configuration, it is possible to suppress dripping during the spraying method, form a spray-applied polyurethane foam for roofs that has high heat insulation properties, excellent smoothness, and high interlayer adhesion strength of the polyurethane foam.

[0064] Spray-applied polyurethane foam for roofs is formed by foaming a mixture of liquids to obtain a foamed material, and then spraying the foamed material using a spray gun or other spraying equipment. The distance between the spraying equipment and the object to be sprayed is preferably 300 to 1,200 mm, more preferably 400 to 1,100 mm, and even more preferably 500 to 1,000 mm. When spraying foamed material using equipment capable of spraying, the discharge rate is preferably 0.45 to 11.3 kg / min, more preferably 2.0 to 10.0 kg / min, and even more preferably 4.0 to 8.0 kg / min.

[0065] Spray-applied polyurethane foam for roofing may consist of a single layer or multiple layers. If it consists of multiple layers, the components contained in each layer may be the same or different.

[0066] The spray-applied polyurethane foam used for roofs in this embodiment is suitable as an insulating layer for the roofs of structures. [Examples]

[0067] The present invention will be described in detail below based on examples, but the present invention is not limited to the following examples, and various modifications are possible without departing from the spirit of the invention.

[0068] The details of the raw materials used in Solution A and Solution B of the following examples and comparative examples are shown below. • Polyester polyol 1: "Maximol (registered trademark) RDK-133", manufactured by Air Water Performance Chemical Co., Ltd.; phthalic anhydride-based polyester polyol, hydroxyl value 315 mg KOH / g (catalog value) • Polyester polyol 2: "Maximol (registered trademark) SDK-145", manufactured by Air Water Performance Chemical Co., Ltd.; succinic acid-based polyester polyol, hydroxyl value 96 mg KOH / g (catalog value) • Polyester polyol 3: "Maximol (registered trademark) RFK-556", manufactured by Air Water Performance Chemical Co., Ltd.; terephthalic acid-based polyester polyol, hydroxyl value 224 mgKOH / g (catalog value) • Mannich-type polyol 1: "EXCENOL (registered trademark) FB-655", manufactured by AGC Inc.; hydroxyl value 350 mg KOH / g (catalog value) • Mannich-type polyol 2: "EXCENOL (registered trademark) FB-512", manufactured by AGC Inc.; hydroxyl value 315 mg KOH / g (catalog value) • Ethylenediamine polyol 1: "Sannix NL-300", manufactured by Sanyo Chemical Industries, Ltd.; Aliphatic amine polyol, hydroxyl value 746 mgKOH / g (catalog value) • Foaming catalyst: "JEFFCAT® DMDEE", manufactured by Huntsman Japan Co., Ltd.; bis(2-morpholinoethyl) ether • Resin-based catalyst 1: "Lonzacure(registered trademark) DETDA80", manufactured by Lonza Japan Co., Ltd.; primary amine catalyst, diethylmethylbenzenediamine (diethyltoluenediamine) • Resin-based catalyst 2: "TOYOCAT-DM70", manufactured by Tosoh Corporation; imidazole catalyst, 1,2-dimethylimidazole • Resin-based catalyst 3: "POLYCAT(registered trademark) 12", manufactured by Evonik Japan Co., Ltd.; tertiary amine catalyst, N-methyldicyclohexylamine, urethane catalyst • Metal catalyst: "Pukat 25", manufactured by Nippon Chemical Industrial Co., Ltd.; bismuth 2-ethylhexanoate • Trimerization catalyst: "U-CAT 18X", manufactured by Sunapro Co., Ltd.; methyltriethylammonium 2-ethylhexanoate, quaternary ammonium salt • HCFO: "Solstice® LBA", manufactured by Honeywell International Ltd.; trans-1-chloro-3,3,3-trifluoropropene (HCFO-1233zd(E)) • TMCPP: "TMCPP", manufactured by Daihachi Chemical Industry Co., Ltd.; Tris(β-chloropropyl) phosphate, liquid flame retardant • PU-2251C (Foam stabilizer): "STB PU-2251C", manufactured by Productos Concentrol.societe anonyme, silicone-based foam stabilizer. • Polyisocyanate compound: Polymethylene polyphenyl polyisocyanate (Polymeric MDI); "Millionate® MR-200", manufactured by Tosoh Corporation.

[0069] [Examples 1-9 and Comparative Examples 1-3] <Manufacturing of two-component compositions> The components were blended according to the formulations shown in Tables 1 and 2, and mixed using a known stirring device such as a stirrer to obtain solution A. The polyisocyanate compound was used as solution B to obtain a two-component composition.

[0070] <Manufacturing of spray-applied polyurethane foam 1> Liquid A and Liquid B were mixed and foamed using an air-driven mixing device "Reactor A25" (manufactured by Graco Co., Ltd.) and a liquid purging gun "Fusion CS" (manufactured by Graco Co., Ltd., spray gun). A 20mm thick first layer was sprayed onto a 450mm square, 12mm thick JAS standard ordinary plywood, class 1, grade 1, under the following spraying conditions. After standing for 5 minutes, another 20mm thick first layer was sprayed, followed by another 20mm thick second layer, which was then laminated on top of the first layer. After standing for another 5 minutes, a 20mm thick third layer was sprayed onto the second layer, resulting in a sprayed polyurethane foam 1 with a total thickness of 60mm. (Spraying conditions) • Ambient temperature: 20℃±2℃ • Distance between the spray gun and the JAS standard ordinary plywood, Class 1, Grade 1: 700 mm ·Discharge amount: 0.45~11.3kg / min

[0071] <Manufacturing of spray-applied polyurethane foam 2> In the above-mentioned <Manufacturing of Spray-Applied Polyurethane Foam 1>, spray-applied polyurethane foam 2 with a total thickness of 20 mm was obtained in the same manner as above, except that the second and third layers were not formed.

[0072] [Measurement and Evaluation] The polyol compositions of the examples and comparative examples, and the spray-applied polyurethane foam produced using them, were evaluated for the following items. The evaluation results are shown in Tables 1 and 2.

[0073] <Thermal conductivity> The thermal conductivity of spray-applied polyurethane foam 1 was measured in accordance with JIS A 9526:2022 and JIS A 1412-1:2016.

[0074] <Compression strength> The compressive strength of spray-applied polyurethane foam 1 was measured in accordance with JIS A 9526:2022 and JIS K 7220:2006. The test specimens used for measuring the compressive strength were taken from a position at least 3 mm away from the adhesive surface between the JAS standard ordinary plywood Class 1, Grade 1 and the spray-applied polyurethane foam 1.

[0075] <Adhesive strength> Using spray-applied polyurethane foam 1, the adhesive strength (adhesion between the object to be sprayed and the spray-applied polyurethane foam, and the adhesive strength between the layers of spray-applied polyurethane foam) was measured in accordance with JIS A 9526:2022.

[0076] <Surface smoothness and surface smoothness> After cutting out a section of spray-applied polyurethane foam 2 to a size of 100 mm x 100 mm, it was divided into four sections to obtain test specimens 1 to 4. For test specimens 1 to 4, the height (H) of the highest point (convex part) and the depth (D) of the lowest point (concave part) on the surface of each test specimen were measured using a "Height Gauge No. 307" (manufactured by Ozaki Seisakusho). The value obtained by dividing the height of the convex part by the depth of the concave part (H / D) was calculated, and the average value (M) of H / D for test specimens 1 to 4 was calculated to determine the surface smoothness. Based on the surface smoothness, the surface smoothness was evaluated according to the following criteria. A (Smoothest): M is between 1.00 and 1.05 B (Smooth): M is greater than 1.05 and less than or equal to 1.15 C (slightly smooth): M is greater than 1.15 and less than 1.28 D (Not smooth): M is 1.28 or higher

[0077] <Appearance (lateral stretching and dripping)> [Horizontal stretching] 40.0g of solution A and 42.0g of solution B were kept warm at 15°C for 5-10 minutes to regulate the temperature. The temperature-regulated solutions A and B were placed in a 500ml polypropylene dispensing cup and mixed and stirred at 3000rpm for 3 seconds. Then, the change in height of the foamed material (rise profile (Figures 1 and 2)) from the start to the stop of foaming (expansion) was measured using the amplifier unit "LB-300" (manufactured by Keyence Corporation). From the rise profile, the presence or absence of lateral elongation was evaluated according to the following criteria. In Figures 1 and 2, the y-axis represents the height of the foam, with the highest point reached by the foam being defined as 100% of the height. A: Foaming occurs in a single stage (see Figure 1). B: The foaming process is in two stages (see Figure 2).

[0078] [Drip] The manufacturing process of spray-applied polyurethane foam 2 was visually observed, and it was evaluated as A if no dripping occurred, and B if dripping occurred.

[0079] [Table 1]

[0080] [Table 2]

[0081] The two-component composition of the present invention has high thermal insulation properties because it can form foamed polyurethane foam by spraying. Furthermore, as can be seen from Tables 1 and 2, the two-component composition of the present invention was found to suppress dripping during spraying, have excellent smoothness, and have high interlayer adhesion strength of the foamed polyurethane foam.

Claims

1. A two-component composition for spray-applied polyurethane foam for roofing, Solution A contains a polyol, a catalyst, a foaming agent, and a foam stabilizer, It consists of solution B containing an isocyanate compound, The catalyst includes a foaming catalyst and a resinifying catalyst (excluding a metal catalyst), The foaming agent comprises a hydrochlorofluoroolefin, The resin catalyst comprises a primary amine catalyst and a tertiary amine catalyst. A two-component composition that does not contain the metal catalyst, which is a resinification catalyst, or the trimerizing catalyst.

2. The aforementioned liquid A and liquid B are mixed and foamed to obtain a foamed product. The two-component composition according to claim 1, wherein the foam is sprayed onto a 450 mm square, 12 mm thick JAS standard ordinary plywood of class 1, grade 1, etc., by the method described below (spraying method), and the sprayed polyurethane foam has a total thickness of 60 mm, and the surface smoothness obtained by the method described below (method for calculating surface smoothness) is less than 1.

28. (Spraying method) Using a spray gun, under the conditions of an ambient temperature of 20°C ± 2°C, a distance of 700 mm between the spray gun and the JAS standard ordinary plywood Class 1 Grade 1, and a discharge rate of 0.45 to 11.3 kg / min, a first layer with a thickness of 20 mm is sprayed, left to stand for 5 minutes, then a second layer with a thickness of 20 mm is sprayed on top of the first layer to create a laminate, left to stand for another 5 minutes, and then a third layer with a thickness of 20 mm is sprayed on top of the second layer to create a laminate. (Method for calculating surface smoothness) After cutting out the central part of the sprayed polyurethane foam obtained by the above (spraying method) to a size of 100 mm square, the 100 mm square sprayed polyurethane foam is divided into four parts to form test pieces 1 to 4. For each of the test specimens 1 to 4, the height (H) of the highest point (convex part) and the depth (D) of the lowest point (concave part) on the surface are measured, and the value ((H) / (D)) is calculated by dividing (H) by (D). The average value of ((H) / (D)) for the test specimens 1 to 4 is defined as the surface smoothness.

3. The aforementioned liquid A and liquid B are mixed and foamed to obtain a foamed product. When the aforementioned foam is sprayed onto a 450 mm square, 12 mm thick JAS standard ordinary plywood of class 1, grade 1, by the following (spraying method), a spray-applied polyurethane foam with a total thickness of 60 mm is formed, The two-component composition according to claim 1, wherein the adhesive strength between the spray-applied polyurethane foam and the JAS standard ordinary plywood class 1, type 1 is 0.2 MPa or more. (Spraying method) Using a spray gun, under the conditions of an ambient temperature of 20°C ± 2°C, a distance of 700 mm between the spray gun and the JAS standard ordinary plywood Class 1 Grade 1, and a discharge rate of 0.45 to 11.3 kg / min, a first layer with a thickness of 20 mm is sprayed, left to stand for 5 minutes, then a second layer with a thickness of 20 mm is sprayed on top of the first layer to create a laminate, left to stand for another 5 minutes, and then a third layer with a thickness of 20 mm is sprayed on top of the second layer to create a laminate.

4. The aforementioned liquid A and liquid B are mixed and foamed to obtain a foamed product. When the aforementioned foam is sprayed onto a 450 mm square, 12 mm thick JAS standard ordinary plywood of class 1, grade 1, by the following (spraying method), a spray-applied polyurethane foam with a total thickness of 60 mm is formed, The two-component composition according to claim 1, wherein the compressive strength of the sprayed polyurethane foam in the parallel and perpendicular directions is 0.2 MPa or more, each. (Spraying method) Using a spray gun, under the conditions of an ambient temperature of 20°C ± 2°C, a distance of 700 mm between the spray gun and the JAS standard ordinary plywood Class 1 Grade 1, and a discharge rate of 0.45 to 11.3 kg / min, a first layer with a thickness of 20 mm is sprayed, left to stand for 5 minutes, then a second layer with a thickness of 20 mm is sprayed on top of the first layer to create a laminate, left to stand for another 5 minutes, and then a third layer with a thickness of 20 mm is sprayed on top of the second layer to create a laminate.

5. The two-component composition according to claim 1 or 2, wherein the resin catalyst comprises an imidazole catalyst.

6. The two-component composition according to claim 1 or 2, wherein the total content of the foaming catalyst and the resinifying catalyst is 1 to 30 parts by mass per 100 parts by mass of the polyol.

7. The two-component composition according to claim 1 or 2, wherein the foaming agent contains water, and the water content is 2.0 parts by mass or less per 100 parts by mass of the polyol.

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