Foam, foam-forming composition, and method for producing foam

Abstract

To provide a technology by which a resin foam having excellent fire retardancy can be manufactured without necessarily using antimony trioxide.SOLUTION: A foam-forming composition includes a polyisocyanate compound (A), an active hydrogen compound (B), a blowing agent (C), and a catalyst (D). The foam-forming composition further includes a guanidine-based compound (E).SELECTED DRAWING: None

Description

[Technical field]

[0001] The present invention relates to a foam, a foam-forming composition, and a method for producing a foam. [Background technology]

[0002] Various foams having high flame retardancy have been proposed (for example, Patent Documents 1 to 4). Among them, urethane foam containing antimony trioxide as a flame retardant has particularly excellent flame retardancy (for example, Patent Document 1).

[0003] [Patent Document 1] Special Publication Sho-006279 Publication [Patent Document 2] Special Publication No. 61-50965 [Patent Document 3] Japanese Patent Application Publication No. 9-195415 [Patent Document 4] JP 2005-60643 A Summary of the Invention [Problem to be solved by the invention]

[0004] Here, antimony trioxide is designated as a deleterious substance under the Poisonous and Deleterious Substances Control Law. Therefore, there are concerns about safety when using it. Therefore, an object of the present invention is to provide a technology that can produce a resin foam that exhibits excellent flame retardancy without necessarily using antimony trioxide. [Means for solving the problem]

[0005] The present invention (1) is a foam-forming composition comprising a polyisocyanate compound (A) having two or more isocyanato groups, an active hydrogen compound (B) having two or more active hydrogen sites, a blowing agent (C), and a catalyst (D), characterized in that the foam-forming composition further contains a guanidine compound (E). The present invention (2) relates to the guanidine compound (E) represented by the following general formula: The foam-forming composition of the invention (1) is a compound represented by the formula (JPEG0007610473000001.jpg31144) (R is each independently hydrogen or a monovalent organic group) or a salt thereof. The present invention (3) relates to the foam-forming composition according to the invention (1) or (2), wherein the average particle size of the guanidine compound (E) is 80 μm or less. The present invention (4) is the foam-forming composition according to any one of the inventions (1) to (3), wherein the content of the guanidine compound (E) is 1 to 15 mass% based on the total mass of the polyisocyanate compound (A) and the active hydrogen compound (B). The present invention (5) relates to the foam-forming composition according to any one of the above-mentioned inventions (1) to (4), wherein the nitrogen compound (E) is dicyandiamide or guanidine phosphate. The present invention (6) is the foam-forming composition according to any one of the above inventions (1) to (5), further comprising a phosphorus-based flame retardant (F). The present invention (7) relates to the foam-forming composition according to the invention (6), wherein the mass ratio of the guanidine compound (E) to the phosphorus-based flame retardant (F) {(E):(F)} is 95:5 to 30:70. The present invention (8) is a foam characterized by containing a guanidine compound (E). The present invention (9) relates to the guanidine compound (E) represented by the following general formula: JPEG0007610473000002.jpg31144 (wherein R is, independently of each other, hydrogen or a monovalent organic group) or a salt thereof, according to the above-mentioned invention (8). The present invention (10) relates to the foam according to the invention (8) or (9), wherein the average particle size of the guanidine compound (E) is 80 μm or less. The present invention (11) is the foam according to any one of the above inventions (8) to (10), wherein the content of the guanidine compound (E) is 0.5 to 15 mass % based on the total mass of the foam. The present invention (12) is a form according to any one of the inventions (8) to (11), wherein the nitrogen compound (E) is dicyandiamide or guanidine phosphate. The present invention (13) is the foam according to any one of the above inventions (8) to (12), further comprising a phosphorus-based flame retardant (F). The present invention (14) relates to the foam according to the invention (13), wherein the mass ratio of the guanidine compound (E) to the phosphorus-based flame retardant (F) {(E):(F)} is 95:5 to 30:70. The present invention (15) is a method for producing a foam, comprising the step of foaming and curing the foam-forming composition according to any one of the above inventions (1) to (7) to obtain a foam. Effect of the Invention

[0006] According to the present invention, it is possible to provide a technique capable of producing a resin foam exhibiting excellent flame retardancy without necessarily using antimony trioxide. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0007] The foam (preferably urethane foam or urea foam) according to the present invention, the foam-forming composition which is the raw material for producing the foam, and the production method and uses of the foam will be described below in this order.

[0008] Form The foam according to the present invention is characterized in that it contains a guanidine compound (E). Here, the foam is preferably a flexible foam. The flexible foam is formed by foaming from a foaming raw material containing an active hydrogen compound having two or more active hydrogen sites (e.g., polyol, polyamine), polyisocyanate, a catalyst, a blowing agent, and a flame retardant, and has a density (JIS K 7222:2005) of 8 to 120 kg / m 3 The characteristic components contained in the foam will be described in detail below.

[0009] <Ingredients> (Guanidine Compounds (E)) The guanidine compound (E) according to the present invention is not particularly limited as long as it has a guanidine structure in its chemical structure. Here, the preferred guanidine compound (E) is represented by the following general formula: The compound represented by JPEG0007610473000003.jpg31144 (R is independently hydrogen or a monovalent organic group) or a salt thereof. The "organic group" includes, but is not limited to, hydroxy, linear or branched alkyl, cycloalkyl, aryl, alkoxy, halogen, ester, carboxy, aldehyde, amino, imino, imide, nitrile, amide, imide, cyano, sulfo, nitro, sulfide, thiol, isocyanate, and nitro. The above-mentioned groups (e.g., hydrocarbon groups such as alkyl, cycloalkyl, and aryl) may have a part of the carbon of the skeleton substituted with a heteroatom (e.g., S, N, O, P, etc.), or may be substituted with another substituent. The "salt thereof" is, for example, a salt of the compound represented by the above general formula and an acid (e.g., phosphoric acid, hydrochloric acid, carbonic acid, sulfuric acid, nitric acid). Examples of the guanidine-based compound or its salt include dicyandiamide and guanidine phosphate.

[0010] Here, the melting point of the guanidine compound (E) is preferably 150 to 400° C., more preferably 170 to 350° C., and even more preferably 180 to 330° C. The guanidine compound (E) that melts at the preferred melting point can exhibit a stronger oxygen blocking effect at high temperatures, thereby achieving higher flame retardancy.

[0011] In addition, when the guanidine compound (E) is thermally decomposed, it is preferable that a part of the thermal decomposition product is melamine. Melamine is generated and sublimated at high temperatures, which brings about an oxygen dilution effect, thereby realizing higher flame retardancy.

[0012] The average particle size of the guanidine compound (E) is preferably 80 μm or less, more preferably 50 μm or less, and even more preferably 30 μm or less. The lower limit is not particularly limited, and is, for example, 1 μm or more. When the guanidine compound (E) is in the above-mentioned preferred range, higher flame retardancy can be achieved. Here, the "average particle size" referred to in this specification and claims refers to the particle size at the point corresponding to 50% volume when a cumulative frequency distribution curve of particle sizes is calculated with the total volume of the particles being 100%.

[0013] (Phosphorus-based flame retardants (F)) The foam according to the present invention preferably further contains a phosphorus-based flame retardant (F) as a flame retardant component in addition to the guanidine compound (E). The phosphorus-based flame retardant is not particularly limited as long as it contains phosphorus element, and examples thereof include phosphorus-based powder flame retardants such as red phosphorus; phosphate ester-based flame retardants such as aliphatic phosphate esters, aromatic phosphate esters, aromatic condensed phosphate esters, halogen phosphate esters, and halogen-containing condensed phosphate esters; phosphates, phosphites, hypophosphites; and ammonium polyphosphate. For example, commercially available phosphorus-based powder flame retardants include those manufactured by Daihachi Chemical Industry Co., Ltd. under the product names "SH-850", "CR-900", "DAIGUARD-1000", and "PX-200".

[0014] Here, the average particle size of the phosphorus-based flame retardant (F) is preferably 80 μm or less, more preferably 50 μm or less, and even more preferably 30 μm or less. The lower limit is not particularly limited, and is, for example, 1 μm or more. When the phosphorus-based flame retardant (F) has the above-mentioned preferred average particle size, higher flame retardancy can be achieved.

[0015] (Other ingredients) The foams of the present invention may contain other ingredients such as antioxidants, colorants, dispersants, etc.

[0016] <Compounding amount / compounding ratio> (Guanidine Compounds (E)) The content of the guanidine compound (E) is preferably 0.5 to 15 mass%, more preferably 0.9 to 15 mass%, and even more preferably 1 to 15 mass%, based on the total mass (dry mass) of the foam. Within this range, in particular, 1 to 14 mass% is preferable, more preferably 4 to 9 mass%, and even more preferably 5 to 8 mass%. When the content of the guanidine compound (E) is within the above-mentioned preferable range, higher flame retardancy can be achieved.

[0017] (Phosphorus-based flame retardants (F)) The content of the phosphorus-based flame retardant (F) is preferably 0.05 to 15 mass%, more preferably 0.09 to 15 mass%, and even more preferably 0.1 to 15 mass%, based on the total mass (dry mass) of the foam. Within this range, 0.1 to 14 mass% is particularly preferable, 1.0 to 6 mass% is more preferable, and 1.5 to 5 mass% is even more preferable. When the content of the phosphorus-based flame retardant (F) is within the above-mentioned preferable range, higher flame retardancy can be achieved.

[0018] (Antimony Trioxide) The content of antimony trioxide is preferably 3% by mass or less (more preferably below detection limits or not present) based on the total mass of the foam. A very low or zero content of antimony trioxide provides a safer foam.

[0019] (Halogen-containing flame retardants) The content of the halogen-containing flame retardant is preferably 8% by mass or less (more preferably below the detection limit or not contained) based on the total mass of the foam. The halogen-containing flame retardant here is a flame retardant other than the guanidine-based compound (E) and the phosphorus-based flame retardant (F), such as polyvinyl chloride, tris(chloropropyl)phosphate, chlorinated paraffin, brominated cycloparaffin, tetrabromobisphenol A, and hexabromobenzene (HBB). If the content of the halogen-containing flame retardant is very low or zero, yellowing can be prevented even when the foam is hot-pressed at high temperatures, making it possible to process the foam in a short time.

[0020] (Mass ratio of guanidine compound (E) to phosphorus flame retardant (F)) The mass ratio of the guanidine compound (E) to the phosphorus-based flame retardant (F) {(E):(F)} is preferably 95:5 to 30:70, more preferably 85:15 to 40:60 mass%, and even more preferably 80:20 to 50:50 mass%. When the mass ratio of the guanidine compound (E) to the phosphorus-based flame retardant (F) is within the above-mentioned preferred range, higher flame retardancy can be achieved.

[0021] <Foam manufacturing method> The foam manufacturing method will be described below in the order of the manufacturing raw materials (foam-forming composition) and the manufacturing process.

[0022] <Manufacturing raw materials (foam-forming composition)> The foam-forming composition according to the present invention preferably contains a polyisocyanate compound (A) having two or more isocyanato groups, an active hydrogen compound (B) having two or more active hydrogen sites, a blowing agent (C), a catalyst (D), a guanidine compound (E), and a phosphorus-based flame retardant (G). Each component and its content will be described in detail below.

[0023] (Polyisocyanate compound (A) having two or more isocyanate groups) The polyisocyanate compound (A) used in the foam-forming composition is not particularly limited as long as it has two or more isocyanato groups, and examples thereof include tolylene diisocyanate (TDI), diphenylmethane diisocyanate (MDI), triphenyl diisocyanate, xylene diisocyanate, polymethylene polyphenylene polyisocyanate, hexamethylene diisocyanate, naphthalene diisocyanate, isophorone diisocyanate, and the like, as well as isocyanato group-terminated prepolymers {a reaction product of a polyisocyanate compound having two or more isocyanato groups and a compound having two or more active hydrogen sites (e.g., polyol or polyamine), and a compound having two or more isocyanato groups}. Examples of diphenylmethane diisocyanate include monolic MDI (pure MDI), polymeric MDI, and a combination of one or more types of prepolymers of polymeric MDI. Here, specific examples of diphenylmethane diisocyanate-based isocyanates include 2,2'-diphenylmethane diisocyanate (2,2'-MDI), 2,4'-diphenylmethane diisocyanate (2,4'-MDI), 4,4'-diphenylmethane diisocyanate (4,4'-MDI), polymeric MDI, which is a mixture of diphenylmethane diisocyanate and polymethylene polyphenylene polyisocyanate, and MDI prepolymer obtained by reacting diphenylmethane diisocyanate with a compound having two or more active hydrogen sites (e.g., polyol, polyamine). These may be used alone, or two or more may be used in combination as necessary, such as using TDI and MDI in combination. In the present invention, tolylene diisocyanate (TDI) can be preferably used. The TDI is not particularly limited, but is preferably a mixture of 2,4-TDI and 2,6-TDI in a blending ratio (mass ratio: 2,4-TDI / 2,6-TDI) of 100 / 0 to 50 / 50, and particularly preferably a mixture of 80 / 20 to 65 / 35.

[0024] The isocyanate index is usually 70 to 130, and preferably 80 to 120. The isocyanate index is a value obtained by dividing the number of moles of isocyanate groups in a polyisocyanate by the total number of moles of active hydrogen groups of an active hydrogen compound (e.g., hydroxyl groups of a polyol or amino groups of a polyamine) and active hydrogen groups such as water as a blowing agent, and multiplying the result by 100, and is calculated as [NCO equivalent of polyisocyanate / active hydrogen equivalent x 100].

[0025] (Active hydrogen compound (B) having two or more active hydrogen sites) The active hydrogen compound used in the foam-forming composition is not particularly limited as long as it has two or more active hydrogen sites, and is, for example, a polyol or a polyamine. In the case of a flexible foam, it is preferable to use a polyether polyol and / or a polyester polyol.

[0026] Examples of polyether polyols include polyether polyols obtained by adding alkylene oxides such as ethylene oxide (EO) and propylene oxide (PO) to polyhydric alcohols such as ethylene glycol, diethylene glycol, propylene glycol, dipropylene glycol, butylene glycol, neopentyl glycol, glycerin, pentaerythritol, trimethylolpropane, sorbitol, and sucrose. In particular, polyether polyols having a molecular weight of 2000 to 7000 and a functional number of 2 to 6 are preferred.

[0027] The polyester polyol having one or more alkyl side chains is a polymer having an aliphatic branched glycol and an aliphatic dicarboxylic acid as structural units. Specific examples of the aliphatic branched glycol include 1,2-propylene glycol, 1-methyl-1,3-butylene glycol, 2-methyl-1,3-butylene glycol, neopentyl glycol, 1-methyl-1,4-pentylene glycol, 2-methyl-1,4-pentylene glycol, 1,2-dimethyl-neopentyl glycol, 2,3-dimethyl-neopentyl glycol, 1-methyl-1,5-pentylene glycol, 2-methyl-1,5-pentylene glycol, 3-methyl-1,5-pentylene glycol, 1,2-dimethylbutylene glycol, 1,3-dimethylbutylene glycol, 2,3-dimethylbutylene glycol, and 1,4-dimethylbutylene glycol. These aliphatic branched glycols are used alone or in combination of two or more kinds. Specific examples of the aliphatic dicarboxylic acid include oxalic acid, succinic acid, glutaric acid, adipic acid, sebacic acid, dodecanedioic acid, and 1,6-cyclohexanedicarboxylic acid. In addition, derivatives such as lower alkyl esters and acid anhydrides of these are also included. These can be used alone or in combination of two or more. In addition, aliphatic polyester polyols having one or more alkyl side chains and obtained from aliphatic dibasic acids and aliphatic branched dihydric alcohols are preferred, and the average molecular weight (number average molecular weight) of the aliphatic polyester polyol is 1000 to 5000 (more preferably 2000 to 3000). In addition, the number of functional groups is preferably 2 to 4 in order to achieve both flexibility and toughness.

[0028] (Foaming agent (C)) The blowing agent used in the foam-forming composition is not particularly limited, and for example, water alone, a combination of halogenated aliphatic hydrocarbons such as methylene chloride, trichloroethane, carbon dioxide gas, etc. as an auxiliary blowing agent in combination with water, or a combination of acid amide is used. In the case of water, for example, polyol and polyisocyanate react to form urethane bonds, and carbon dioxide gas is generated by the reaction of polyisocyanate with water, and the foam is formed by the carbon dioxide gas. In the case of water, the amount of the blowing agent is preferably 0.5 to 7.0 parts by mass per 100 parts by mass of the resin component (polyol + polyisocyanate). If the content of water is more than 7.0 parts by mass, excessive heat is generated by the reaction of water with polyisocyanates, or the open cell structure of the foam is not sufficiently formed, which is not preferable.

[0029] (Catalyst (D)) The catalyst used in the foam-forming composition is, for example, a known catalyst for foam formation, such as an amine catalyst such as triethylamine or tetramethylguanidine, a tin catalyst such as stannous octoate, or a metal catalyst (also called an organometallic catalyst) such as phenylmercury propionate or lead octenate. The typical amount of catalyst is, for example, 0.05 to 2.0 parts by mass per 100 parts by mass of the resin components (polyol + polyisocyanate).

[0030] (Guanidine compounds (E) and phosphorus-based flame retardants (F)) The guanidine compound (E) and phosphorus-based flame retardant (F) used in the foam-forming composition are as described in the section on foams. The specific gravity of the guanidine compound (E) (based on the specific gravity of water at 25°C being 1) is preferably 1 to 2, more preferably 1.2 to 1.6, and even more preferably 1.3 to 1.5. Similarly, the specific gravity of the phosphorus-based flame retardant (F) is preferably 1 to 2, more preferably 1.2 to 1.6, and even more preferably 1.3 to 1.5. If these specific gravities are within the above preferred ranges, the sedimentation stability in the liquid is more excellent.

[0031] Here, the content of the guanidine compound (E) is preferably 1 to 15 mass %, more preferably 4 to 9 mass %, and even more preferably 5 to 8 mass %, based on the total mass of the resin components {polyisocyanate compound (A) and active hydrogen compound (B)}.

[0032] The content of the phosphorus-based flame retardant (F) is preferably 0.1 to 15 mass%, more preferably 1.0 to 6 mass%, and even more preferably 1.5 to 5 mass%, based on the total mass of the resin components {polyisocyanate compound (A) and active hydrogen compound (B)}.

[0033] The mass ratio of the guanidine compound (E) to the phosphorus-based flame retardant (F) {(E):(F)} is preferably 95:5 to 30:70, more preferably 85:15 to 40:60 mass%, and further preferably 80:20 to 50:50 mass%.

[0034] (Other ingredients) Examples of the auxiliary agent appropriately added to the foam-forming composition include a foam stabilizer, an antioxidant, a colorant, and a dispersant. The foam stabilizer may be, for example, a foam-use known agent. Examples of the foam stabilizer include nonionic surfactants such as polyethylene glycol alkyl ether and sorbitan fatty acid ester, silicone foam stabilizers, anionic surfactants such as sodium dodecylbenzenesulfonate and sodium lauryl sulfate, phenolic compounds, fluorine-containing compound foam stabilizers, and known surfactants. The silicone foam stabilizer is not particularly limited, but even among silicone compounds, those having a polydimethylsiloxane chain number (N) of 25 to 100 are preferred. The amount of the foam stabilizer is preferably 0.1 to 3.0 parts by mass per 100 parts by mass of a compound (e.g., polyol, polyamine) having two or more active hydrogen sites. If the amount is within the above range, a more suitable soft polyurethane foam can be obtained. Examples of the antioxidant include phenolic, phosphorus, and diphenylamine antioxidants, and it is particularly preferred to use either one or both of phosphorus-based and diphenylamine-based antioxidants. In addition, the dispersant can increase the wettability of the powder flame retardant and the solution, and disperse uniformly, leading to improved sedimentation stability. Furthermore, the use of the dispersant can reduce the viscosity and thixotropy during foaming, resulting in a foam with high breathability and low compression set. Examples of dispersants include phosphate esters, fatty acid esters, polyether phosphate ester amines, aliphatic polycarboxylic acids, long-chain aminoamides, polyester acid amide amine salts, and nonionic surfactants.

[0035] <Manufacturing process> (System Fluid) The foam-forming composition according to the present invention is preferably provided as a system liquid. The system liquid may be provided, for example, in the form of a first liquid {containing an isocyanate compound (A)}, a second liquid {containing an active hydrogen compound (B), a guanidine compound (E) and / or a phosphorus-based flame retardant (F), etc.}, and a third liquid {a blowing agent (C), a catalyst (D) and, in some cases, a part of an active hydrogen compound}, and the first liquid and the second liquid are mixed immediately before use. It is preferable that the second liquid contains a component other than the isocyanate compound (A).

[0036] (process) There are two types of foam: slab foam and molded foam. For example, in the case of the slab foam manufacturing process, a foam-forming composition is discharged onto a conveyor, and an active hydrogen compound and a polyisocyanate are reacted at room temperature and atmospheric pressure to form a continuous foam molded product in the shape of a kamaboko (fish paste) that expands upward. After foaming, the product is cut or otherwise shaped to the appropriate dimensions and shape. On the other hand, in the case of the molded foam manufacturing process, a mold having a cavity in the shape of the product is filled with the foam-forming composition and foamed into the shape of the product.

[0037] ≪Applications≫ The foam according to the present invention can be used either alone or in a composite (for example, laminated with a metal plate or a plastic plate). The foam can be used in a wide range of fields. In particular, it is useful as a cushioning material, a sound absorbing material, and a gap filling material for vehicles such as automobiles, railways, and aircraft. For example, when used as a soundproofing material for vehicles, it is suitable for use as a member that requires heat resistance (for example, a soundproofing sheet on the back of an engine hood, an engine cover, an oil pan cover, etc.). In addition to the above, both slab foam and molded foam can be applied to various applications.

[0038] More specifically, in the case of a composite, examples include a mode of lamination with plastics, films, fabric coverings (nylon fabrics, polyester fabrics, polyurethane fabrics), artificial leather, genuine leather, nonwoven fabrics, mesh fabrics, metals, etc. Examples include covering materials and ceiling materials for cushioned automobile seats, upholstery materials for furniture sofas, upholstery materials for beds, etc. In addition, examples include vehicle applications such as automobiles, for example, covering materials and ceiling materials for cushioned automobile seats, lining and gasket applications, vehicle soundproofing applications (for example, soundproofing sheets on the backside of engine hoods, engine covers, oil pan covers, hood silencers, dash silencers, side covers, under covers, and other acoustic attenuation materials and gap fillers), furniture applications (bedding, furniture, office furniture seat applications, carpet cushion applications, flooring underlays), boat applications, bus seat applications, interiors of mass transportation facilities such as trains and airplanes, tractor applications, bicycle applications, compressor applications, covering applications, sporting goods applications, shoes applications, packaging shock-absorbing cushion applications, and textile applications. EXAMPLES

[0039] <Production Example> The polyurethane raw materials prepared using the following raw materials according to the formulations in Tables 1 and 2 were mixed and stirred, transferred to a foaming box, and foamed to produce polyurethane foams according to Examples 1 to 17 and Comparative Examples 1 to 4. Polyisocyanate compound (A): Tolylene diisocyanate (2,4-TDI isomer ratio 80%) Active hydrogen compound (B): Polyether polyol (GP3050NS manufactured by Sanyo Chemical Industries, Ltd.; functional group number: 3, Mw: 3000) Foaming agent (C): Water Catalyst (D): N,N-dimethylaminohexanol (amine catalyst), tin catalyst Guanidine compounds (E): dicyandiamide (average particle size 30 μm, 50 μm, 80 μm), guanidine phosphate (average particle size 17 μm) Phosphorus-based flame retardant (F): Aluminum phosphinate (average particle size 30 μm, 50 μm), Ammonium polyphosphate (average particle size 15 μm) Foam stabilizer: Silicone foam stabilizer (manufactured by Toray Dow Corning Co., Ltd., "SZ-1136") Other additives: Vinyl chloride, antimony trioxide, zinc oxide, antioxidants

[0040] <Initial Testing> First, the polyurethane foams according to Examples 1 to 17 and Comparative Examples 1 to 4 were evaluated for flame retardancy {FMVSS 302 (horizontal test)}, the presence or absence of dripping, and the presence or absence of yellowing during hot pressing. The results are shown in Tables 1 to 3.

[0041] [Table 1]

[0042] [Table 2]

[0043] [Table 3]

[0044] Next, a secondary evaluation was conducted on samples that were rated "Good" in the initial test. Flame retardancy was evaluated using UL94 HBF (horizontal test), UL94 HF flammability test (horizontal test), and aircraft interior flammability test FAR25.853 (vertical test).

[0045] [Table 4]

[0046] [Table 5]

Claims

1. A foam-forming composition comprising a polyisocyanate compound (A) having two or more isocyanato groups, an active hydrogen compound (B) having two or more active hydrogen sites, a blowing agent (C), and a catalyst (D), Further containing a guanidine compound (E), the content of the guanidine compound (E) is 4 to 9 mass% based on the total mass of the polyisocyanate compound (A) and the active hydrogen compound (B); The guanidine compound (E) is dicyandiamide or guanidine phosphate, Further contains a phosphorus-based flame retardant (F). A foam-forming composition comprising:

2. The foam-forming composition according to claim 1 , wherein the average particle size of the guanidine compound (E) is 80 μm or less.

3. The foam-forming composition according to claim 1 or 2, wherein the mass ratio of the guanidine compound (E) to the phosphorus-based flame retardant (F) {(E):(F)} is 95:5 to 30:

70.

4. A foam containing a guanidine compound (E), The foam is a urethane foam or a urea foam, The content of the guanidine compound (E) is 4 to 9% by mass based on the total mass of the foam. The guanidine compound (E) is dicyandiamide or guanidine phosphate, Further contains a phosphorus-based flame retardant (F). A form characterized by:

5. 5. The foam according to claim 4, wherein the average particle size of the guanidine compound (E) is 80 μm or less.

6. The foam according to claim 4 or 5, wherein the mass ratio of the guanidine compound (E) to the phosphorus-based flame retardant (F) {(E):(F)} is 95:5 to 30:

70.

7. A method for producing a foam, comprising the step of foaming and curing the foam-forming composition according to any one of claims 1 to 3 to obtain a foam.

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