WO2016017797A1 - Flame-retardant polyurethane resin composition - Google Patents

Abstract

Provided is a flame-retardant urethane resin composition comprising a polyisocyanate compound, a polyol compound, a trimerization catalyst, a foaming agent, a foam stabilizer, and an additive. The spin-spin relaxation time (T2S) of a first component in a cured product of the flame-retardant urethane resin composition as measured by a solid echo method in which pulsed NMR is used is 0.01-0.1 milliseconds at 150 °C when the observed nucleus is ¹H, the spin-spin relaxation time (T2L) of a second component is 0.1-1.0 milliseconds, and the signal intensity fraction of the first component is greater than the signal intensity fraction of the second component.

Description

Flame retardant polyurethane resin composition

(Cross-reference of related fields)
This application claims the benefit of priority of Japanese Patent Application No. 2014-157994 filed on Aug. 1, 2014, which is hereby incorporated by reference in its entirety.
(Technical field)
The present invention relates to a flame retardant polyurethane resin composition.

Concrete reinforced with reinforcing bars or the like is used as a structural material to enhance the strength of buildings, such as condominiums, detached houses, various facilities of schools, and outer walls of commercial buildings.

On the other hand, since concrete has heat storage and cold storage properties, there is a disadvantage that the inside of the building is heated by the heat accumulated in the summer, or the inside of the building is cooled as a result of the concrete being cooled in the cold season in winter. . In order to reduce the influence of the outside temperature on the interior of the building through such concrete for a long time, the concrete is usually insulated.

Therefore, a rigid polyurethane foam having flame resistance against fire is used as a heat insulating layer.

Patent Document 1 describes a polyol composition for rigid polyurethane foam containing a polyol compound, a water-soluble organic solvent, a catalyst, a flame retardant, a foaming agent and a polyisocyanate compound. It is described that a rigid polyurethane foam formed by mixing and foaming these components is excellent in flame retardancy.

Patent Document 2 describes a polyol composition for polyurethane foam containing 100 parts by weight of a polyol compound, 10-30 parts by weight of a phosphate ester flame retardant, a foaming agent, a foam stabilizer and a catalyst.

Patent Document 3 describes a flame-retardant rigid polyurethane foam obtained by reacting and curing a polyhydroxyl compound, a polyisocyanate, a urethanization catalyst, a flame retardant, a foam stabilizer and a foaming agent.

Patent Document 4 describes a catalyst composition for producing a rigid polyurethane foam and / or isocyanurate-modified rigid polyurethane foam comprising a quaternary ammonium salt and a heterocyclic tertiary amine compound.

JP 2010-053267 A JP 2002-338651 A Japanese Patent Laid-Open No. 2001-200027 JP 2010-7079 A

When polyurethane foam deforms due to heat such as fire, there is a gap between the location where the polyurethane foam was installed and the polyurethane foam after deformation, and there is a problem that smoke etc. generated by fire etc. diffuses through this gap. Arise. However, none of the above-mentioned Patent Documents 1 to 4 discloses anything about solving the problem of easy shape change when polyurethane foam is affected by heat such as fire.

An object of the present invention is to provide a flame retardant polyurethane composition having excellent flame retardancy and shape retention during heating.

The flame retardant urethane resin composition according to the present invention is as follows.

Item 1. A flame retardant urethane resin composition comprising a polyisocyanate compound, a polyol compound, a trimerization catalyst, a foaming agent, a foam stabilizer, and an additive, wherein a pulse NMR is measured in a cured product of the flame retardant urethane resin composition. The spin-spin relaxation time (T2S) of the first component measured at 150 ° C. by the solid echo method and the observation nucleus at ¹ H is between 0.01 ms and 0.1 ms, and the second component The spin-spin relaxation time (T2L) is between 0.1 ms and 1.0 ms, and the signal intensity fraction of the first component is greater than the signal intensity fraction of the second component. Flammable urethane resin composition.

Item 2. Item 2. The flame retardancy according to Item 1, wherein the additive includes at least one selected from red phosphorus, phosphate ester, phosphate-containing flame retardant, bromine-containing flame retardant, antimony-containing flame retardant, and metal hydroxide. Urethane resin composition.
Item 3. Item 2. The flame retardant urethane resin composition according to Item 1, wherein the additive is in the range of 4.5 to 70 parts by weight based on 100 parts by weight of the urethane resin comprising the polyisocyanate compound and the polyol compound.
Item 4. Item 2. The flame retardant urethane resin composition according to Item 1, wherein the trimerization catalyst is in the range of 0.1 to 10 parts by weight based on 100 parts by weight of the urethane resin comprising the polyisocyanate compound and the polyol compound.
Item 5. Item 5. The flame retardant according to any one of Items 1 to 4, wherein the foaming agent is in a range of 0.1 to 30 parts by weight based on 100 parts by weight of a urethane resin composed of the polyisocyanate compound and the polyol compound. Urethane resin composition.
Item 6. The flame retardant urethane resin composition according to any one of claims 1 to 5, wherein a fraction of the signal intensity in the first component exceeds 80% and a fraction of the signal intensity in the second component is less than 20%. object.
Item 7. Item 7. The flame retardant urethane resin composition according to any one of Items 1 to 6, wherein the isocyanate index is 125 or more.
Item 8. (A) 1st liquid containing polyisocyanate compound, (B) 2nd liquid containing polyol compound, (C) trimerization catalyst, (D) foaming agent, (E) foam stabilizer and (F) additive In the cured product of the flame retardant urethane resin composition, the spin-spin relaxation time (T2S) of the first component measured at 150 ° C. by solid echo method using pulsed NMR and the observed nucleus at ¹ H is 0. .01 ms to 0.1 ms, the second component spin-spin relaxation time (T2L) is between 0.1 ms to 1.0 ms, and the first component signal A combination for forming a flame-retardant urethane resin composition having a strength fraction greater than the signal strength fraction of the second component.

According to the present invention, a flame retardant urethane resin composition excellent in flame retardancy and shape retention during heating is provided.

The flame retardant urethane resin composition according to the present invention will be described.

First, the urethane resin used for the flame retardant urethane resin composition will be described.

Urethane resin consists of a polyisocyanate compound as a main agent and a polyol compound as a curing agent.

Examples of the polyisocyanate compound include aromatic polyisocyanate, alicyclic polyisocyanate, and aliphatic polyisocyanate.

Examples of the aromatic polyisocyanate include phenylene diisocyanate, tolylene diisocyanate, xylylene diisocyanate, diphenylmethane diisocyanate, dimethyldiphenylmethane diisocyanate, triphenylmethane triisocyanate, naphthalene diisocyanate, polymethylene polyphenyl polyisocyanate, and the like.

Examples of the alicyclic polyisocyanate include cyclohexylene diisocyanate, methylcyclohexylene diisocyanate, isophorone diisocyanate, dicyclohexylmethane diisocyanate, and dimethyldicyclohexylmethane diisocyanate.

Examples of the aliphatic polyisocyanate include methylene diisocyanate, ethylene diisocyanate, propylene diisocyanate, tetramethylene diisocyanate, hexamethylene diisocyanate, and the like.

The polyisocyanate compound can be used alone or in combination of two or more. The main component of the urethane resin is preferably diphenylmethane diisocyanate for reasons such as ease of use and availability.

Examples of the polyol compound that is a curing agent for the urethane resin include polylactone polyol, polycarbonate polyol, aromatic polyol, alicyclic polyol, aliphatic polyol, polyester polyol, polymer polyol, polyether polyol, and the like. Are preferred, and aromatic polyester polyols are more preferred.

Examples of the polylactone polyol include polypropiolactone glycol, polycaprolactone glycol, and polyvalerolactone glycol.

Examples of the polycarbonate polyol include a polyol obtained by a dealcoholization reaction of a hydroxyl group-containing compound such as ethylene glycol, propylene glycol, butanediol, pentanediol, hexanediol, octanediol, and nonanediol with diethylene carbonate, dipropylene carbonate, and the like. Etc.

Examples of aromatic polyols include bisphenol A, bisphenol F, phenol novolac, and cresol novolac.

Examples of the alicyclic polyol include cyclohexanediol, methylcyclohexanediol, isophoronediol, dicyclohexylmethanediol, dimethyldicyclohexylmethanediol, and the like.

Examples of the aliphatic polyol include ethylene glycol, propylene glycol, butanediol, pentanediol, and hexanediol.

Examples of the polyester polyol include a polymer obtained by dehydration condensation of a polybasic acid and a polyhydric alcohol, a polymer obtained by ring-opening polymerization of a lactone such as ε-caprolactone, α-methyl-ε-caprolactone, Examples thereof include condensates of hydroxycarboxylic acid and the above polyhydric alcohol.

Here, specific examples of the polybasic acid include adipic acid, azelaic acid, sebacic acid, terephthalic acid, isophthalic acid, and succinic acid. Specific examples of the polyhydric alcohol include bisphenol A, ethylene glycol, 1,2-propylene glycol, 1,4-butanediol, diethylene glycol, 1,6-hexane glycol, neopentyl glycol, and the like. .

Specific examples of the hydroxycarboxylic acid include castor oil, a reaction product of castor oil and ethylene glycol, and the like.

Examples of the polymer polyol include a polymer obtained by graft polymerization of an ethylenically unsaturated compound such as acrylonitrile, styrene, methyl acrylate, and methacrylate on an aromatic polyol, alicyclic polyol, aliphatic polyol, polyester polyol, or the like, polybutadiene Examples thereof include polyols, modified polyols of polyhydric alcohols, and hydrogenated products thereof.

Examples of the modified polyol of a polyhydric alcohol include those obtained by reacting a raw material polyhydric alcohol with an alkylene oxide.

Examples of the polyhydric alcohol include trihydric alcohols such as glycerin and trimethylolpropane; pentaerythritol, sorbitol, mannitol, sorbitan, diglycerin, dipentaerythritol, etc., sucrose, glucose, mannose, fructose, methylglucoside and Tetravalent to octavalent alcohols such as derivatives thereof; phenol, phloroglucin, cresol, pyrogallol, catechol, hydroquinone, bisphenol A, bisphenol F, bisphenol S, 1-hydroxynaphthalene, 1,3,6,8-tetrahydroxynaphthalene , Anthrol, 1,4,5,8-tetrahydroxyanthracene, 1-hydroxypyrene and other phenol polybutadiene polyols; castor oil polyol; hydroxyalkyl (meth) Polyfunctional (e.g. functionality 2-100) polyols such as (co) polymers and polyvinyl alcohol acrylate include condensates of phenol and formaldehyde (novolac) it is.

The method for modifying the polyhydric alcohol is not particularly limited, but a method of adding alkylene oxide (hereinafter abbreviated as AO) is preferably used.

AO includes 2 to 6 carbon atoms such as ethylene oxide (hereinafter abbreviated as EO), 1,2-propylene oxide (hereinafter abbreviated as PO), 1,3-propyloxide, 1,2- Examples include butylene oxide and 1,4-butylene oxide.
Among these, PO, EO and 1,2-butylene oxide are preferable from the viewpoint of properties and reactivity, and PO and EO are more preferable. When two or more types of AO are used (for example, PO and EO), block addition or random addition may be used, or a combination thereof may be used.

Examples of the polyether polyol include ring-opening polymerization of at least one alkylene oxide such as ethylene oxide, propylene oxide, and tetrahydrofuran in the presence of at least one low molecular weight active hydrogen compound having two or more active hydrogens. The polymer obtained by making it contain is mentioned.

Examples of the low molecular weight active hydrogen compound having two or more active hydrogens include diols such as bisphenol A, ethylene glycol, propylene glycol, butylene glycol, and 1,6-hexanediol, and triols such as glycerin and trimethylolpropane. And amines such as ethylenediamine and butylenediamine.

The polyol used in the present invention is preferably a polyester polyol or a polyether polyol because the effect of reducing the total calorific value upon combustion is great.

Among them, it is more preferable to use a polyester polyol having a molecular weight of 200 to 800, and it is more preferable to use a polyester polyol having a molecular weight of 300 to 500. The isocyanate index is a percentage of the equivalent ratio of the isocyanate group of the polyisocyanate compound to the hydroxyl group of the polyol compound. The value exceeding 100 indicates that the isocyanate group is in excess of the hydroxyl group. means.

The lower limit of the range of the isocyanate index of the urethane resin used in the present invention is preferably 125 or more, and more preferably 200 or more. Although an upper limit is not specifically limited, Usually, it is 1000 or less.

The isocyanate index (INDEX) is calculated by the following method.

INDEX = isocyanate equivalent number / (polyol equivalent number + water equivalent number) × 100
here,
Equivalent number of isocyanate = number of parts used of polyisocyanate × NCO content (%) × 100 / NCO molecular weight Number of equivalents of polyol = OHV × number of parts used of polyol ÷ molecular weight of KOH, OHV is hydroxyl value of polyol (mg KOH / g) ,
Equivalent number of water = number of used parts of water × number of OH groups of water / molecular weight of water. In the above formula, the unit of the number of parts used is weight (g), the molecular weight of NCO is 42, the NCO content is the percentage of NCO groups in the polyisocyanate compound in mass%, and the molecular weight of KOH is 56100, the molecular weight of water is 18, and the number of OH groups in water is 2.

The flame retardant urethane resin composition contains a catalyst, a foaming agent and a foam stabilizer.

Examples of the catalyst include triethylamine, N-methylmorpholine bis (2-dimethylaminoethyl) ether, N, N, N ′, N ″, N ″ -pentamethyldiethylenetriamine, N, N, N′-trimethylaminoethyl- Nitrogen atom-containing catalysts such as ethanolamine, bis (2-dimethylaminoethyl) ether, N-methyl, N'-dimethylaminoethylpiperazine, imidazole compounds in which the secondary amine functional group in the imidazole ring is substituted with a cyanoethyl group, etc. Is mentioned.

The addition amount of the catalyst used in the flame retardant urethane resin composition is preferably in the range of 0.1 to 10 parts by weight with respect to 100 parts by weight of the urethane resin, preferably 0.1 to 8 parts by weight. More preferably, the range is from 0.1 parts by weight to 6 parts by weight, and most preferably from 0.1 parts by weight to 3.0 parts by weight.

When the amount is 0.1 parts by weight or more, there is no problem that the formation of urethane bonds is hindered. When the amount is 10 parts by weight or less, an appropriate foaming rate can be maintained and the handling is easy.

A preferred catalyst includes a trimerization catalyst that causes the isocyanate group contained in the polyisocyanate compound, which is the main component of the polyurethane resin, to react and trimerize to promote the formation of an isocyanurate ring.

In order to promote the formation of the isocyanurate ring, for example, as a catalyst, tris (dimethylaminomethyl) phenol, 2,4-bis (dimethylaminomethyl) phenol, 2,4,6-tris (dialkylaminoalkyl) hexahydro -Nitrogen-containing aromatic compounds such as S-triazine; carboxylic acid alkali metal salts such as potassium acetate and potassium 2-ethylhexanoate; tertiary ammonium salts such as trimethylammonium salt, triethylammonium salt and triphenylammonium salt; tetramethyl Quaternary ammonium salts such as ammonium salt, tetraethylammonium, and tetraphenylammonium salt can be used.

The addition amount of the trimerization catalyst used in the flame retardant urethane resin composition is preferably in the range of 0.1 to 10 parts by weight with respect to 100 parts by weight of the urethane resin, and 0.1 to 8 parts by weight. More preferably, it is in the range of parts by weight, more preferably in the range of 0.1 to 6 parts by weight, and most preferably in the range of 0.1 to 3.0 parts by weight. When the amount is 0.1 parts by weight or more, there is no problem that the trimerization of the isocyanate is inhibited. When the amount is 10 parts by weight or less, an appropriate foaming rate can be maintained and the handling is easy.

Also, the foaming agent used in the flame retardant urethane resin composition promotes foaming of the urethane resin.

Specific examples of the blowing agent include, for example, water; hydrocarbons having a low boiling point such as propane, butane, pentane, hexane, heptane, cyclopropane, cyclobutane, cyclopentane, cyclohexane, cycloheptane; dichloroethane, propyl chloride, isopropyl chloride, Chlorinated aliphatic hydrocarbon compounds such as butyl chloride, isobutyl chloride, pentyl chloride, isopentyl chloride; fluorine compounds such as trichloromonofluoromethane, trichlorotrifluoroethane, CHF ₃ , CH ₂ F ₂ , CH ₃ F; dichloromono Hydrochlorofluorocarbons such as fluoroethane (for example, HCFC141b (1,1-dichloro-1-fluoroethane), HCFC22 (chlorodifluoromethane), HCFC142b (1-chloro-1,1-difluoroethane)) Compounds, hydrofluorocarbon compounds such as HFC-245fa (1,1,1,3,3-pentafluoropropane) and HFC-365mfc (1,1,1,3,3-pentafluorobutane); Examples thereof include organic physical foaming agents such as ether compounds or mixtures of these compounds, and inorganic physical foaming agents such as nitrogen gas, oxygen gas, argon gas, and carbon dioxide gas.

The range of the foaming agent is preferably in the range of 0.1 to 30 parts by weight with respect to 100 parts by weight of the urethane resin. The foaming agent is more preferably in the range of 0.1 to 18 parts by weight, still more preferably in the range of 0.5 to 18 parts by weight with respect to 100 parts by weight of the urethane resin. The most preferred range is 5 to 10 parts by weight.

When the water range is 0.1 parts by weight or more, foaming is promoted and the density of the obtained molded product can be reduced. When the water range is 30 parts by weight or less, the foam does not foam and no foam is formed. Can be prevented.

Examples of the foam stabilizer used in the flame-retardant urethane resin composition include surfactants such as polyoxyalkylene foam stabilizers such as polyoxyalkylene alkyl ether, silicone foam stabilizers such as organopolysiloxane, and the like. .

The amount of the foam stabilizer used for the urethane resin cured by the chemical reaction is appropriately set depending on the urethane resin cured by the chemical reaction used. For example, for 100 parts by weight of the urethane resin, A range of 0.1 to 10 parts by weight is preferable.

Catalyst, foaming agent and foam stabilizer can be used alone or in combination of two or more.

Next, the additive used in the present invention will be described.

The flame retardant urethane resin composition contains an additive.

In one embodiment, the additive includes at least one selected from the group consisting of red phosphorus, phosphate ester, phosphate-containing flame retardant, bromine-containing flame retardant, antimony-containing flame retardant, and metal hydroxide. In another embodiment, the additive comprises red phosphorus and at least one selected from the group consisting of phosphate esters, phosphate-containing flame retardants, bromine-containing flame retardants, antimony-containing flame retardants and metal hydroxides. . In another embodiment, the additive includes at least one selected from the group consisting of phosphate esters, phosphate-containing flame retardants, bromine-containing flame retardants, antimony-containing flame retardants, and metal hydroxides.

The additive preferably comprises phosphorus. Examples of preferable combinations of additives to be used include any of the following (a) to (i).
(a) Red phosphorus and phosphate
(b) Red phosphorus and phosphate containing flame retardant
(c) Red phosphorus and bromine containing flame retardants
(d) Red phosphorus and antimony containing flame retardant
(e) Red phosphorus and metal hydroxide
(f) Red phosphorus, phosphate ester and phosphate containing flame retardant
(g) Red phosphorus, phosphate ester and bromine containing flame retardant
(h) Red phosphorus, phosphate-containing flame retardant and bromine-containing flame retardant
(i) Red phosphorus, phosphate ester, phosphate-containing flame retardant and bromine-containing flame retardant The additive amount used in the present invention is the total amount of additives other than urethane resin with respect to 100 parts by weight of urethane resin. The range is preferably in the range of 4.5 to 70 parts by weight, more preferably in the range of 4.5 to 40 parts by weight, and in the range of 4.5 to 30 parts by weight. More preferably, the range is 4.5 to 20 parts by weight.

When the range of the additive is 4.5 parts by weight or more, the molded product made of the flame retardant urethane resin composition can prevent the dense residue formed by the heat of the fire from cracking, and when the additive is 70 parts by weight or less Does not inhibit foaming of the flame retardant urethane resin composition.

The red phosphorus used in the present invention is not limited, and a commercially available product can be appropriately selected and used.

When red phosphorus is included as an additive, the amount of red phosphorus used in the refractory urethane resin composition according to the present invention is in the range of 3.0 to 18 parts by weight with respect to 100 parts by weight of the urethane resin. Preferably there is.

When the range of red phosphorus is 3.0 parts by weight or more, the self-extinguishing property of the flame retardant urethane resin composition is maintained, and when it is 18 parts by weight or less, foaming of the flame retardant urethane resin composition is inhibited. Not.

The phosphate ester used in the present invention is not particularly limited, but it is preferable to use a monophosphate ester, a condensed phosphate ester, or the like.

The monophosphate is not particularly limited, and examples thereof include trimethyl phosphate, triethyl phosphate, tributyl phosphate, tri (2-ethylhexyl) phosphate, tributoxyethyl phosphate, triphenyl phosphate, tricresyl phosphate, trixylyl phosphate, Tris (isopropylphenyl) phosphate, tris (phenylphenyl) phosphate, trinaphthyl phosphate, cresyl diphenyl phosphate, xylenyl diphenyl phosphate, diphenyl (2-ethylhexyl) phosphate, di (isopropylphenyl) phenyl phosphate, monoisodecyl phosphate, 2-acryloyloxyethyl acid phosphate, 2-methacryloyloxyethyl acid phosphate, Diphenyl-2-acryloyloxyethyl phosphate, diphenyl-2-methacryloyloxyethyl phosphate, melamine phosphate, dimelamine phosphate, melamine pyrophosphate, triphenylphosphine oxide, tricresylphosphine oxide, diphenyl methanephosphonate, diethyl phenylphosphonate, Resylcinol bis (diphenyl phosphate), bisphenol A bis (diphenyl phosphate), phosphaphenanthrene, tris (β-chloropropyl) phosphate, and the like.

The condensed phosphate ester is not particularly limited, and examples thereof include trialkyl polyphosphate, resorcinol polyphenyl phosphate, resorcinol poly (di-2,6-xylyl) phosphate (trade name PX-200, manufactured by Daihachi Chemical Industry Co., Ltd.). ), Hydroquinone poly (2,6-xylyl) phosphate, and condensed phosphates such as condensates thereof.

Examples of commercially available condensed phosphate esters include resorcinol polyphenyl phosphate (trade name CR-733S), bisphenol A polycresyl phosphate (trade name CR-741), aromatic condensed phosphate ester (trade name CR747), and resorcinol. Examples thereof include polyphenyl phosphate (trade name ADEKA STAB PFR, manufactured by ADEKA), bisphenol A polycresyl phosphate (trade names FP-600, FP-700, manufactured by ADEKA), and the like.

Among these, it is preferable to use a monophosphate ester because it is highly effective in reducing the viscosity of the composition before curing and in reducing the initial calorific value, and it is preferable to use tris (β-chloropropyl) phosphate. Is more preferable.

は Phosphate ester can be used alone or in combination of two or more.

The addition amount of the phosphate ester is preferably in the range of 1.5 to 52 parts by weight, more preferably in the range of 1.5 to 20 parts by weight with respect to 100 parts by weight of the urethane resin. The range is preferably 2.0 parts by weight to 15 parts by weight, and more preferably 2.0 parts by weight to 10 parts by weight.

When the range of the phosphate ester is 1.5 parts by weight or more, the molded product made of the flame retardant urethane resin composition can prevent the dense residue formed by the heat of the fire from cracking, and the case of 52 parts by weight or less The foaming of the flame retardant urethane resin composition is not hindered.

The phosphate-containing flame retardant used in the present invention contains phosphoric acid.
The phosphoric acid used for the phosphate-containing flame retardant is not particularly limited, and examples thereof include various phosphoric acids such as monophosphoric acid, pyrophosphoric acid, polyphosphoric acid, and combinations thereof.

Examples of the phosphate-containing flame retardant include phosphorus containing salts of various phosphoric acids and at least one metal or compound selected from metals of Group IA to IVB of the periodic table, ammonia, aliphatic amines, and aromatic amines. There may be mentioned acid salts. Examples of metals of Groups IA to IVB of the periodic table include lithium, sodium, calcium, barium, iron (II), iron (III), and aluminum.

Examples of the aliphatic amine include methylamine, ethylamine, diethylamine, triethylamine, ethylenediamine, piperazine and the like.

Also, aromatic amines include pyridine, triazine, melamine, ammonium and the like.

The phosphate-containing flame retardant may be subjected to a known water resistance improving treatment such as silane coupling agent treatment or coating with a melamine resin, and a known foaming aid such as melamine or pentaerythritol may be added. May be.

Specific examples of the phosphate-containing flame retardant include monophosphate, pyrophosphate, polyphosphate, and the like.

The monophosphate is not particularly limited. For example, ammonium salts such as ammonium phosphate, ammonium dihydrogen phosphate, diammonium hydrogen phosphate, phosphoric acid-sodium, disodium phosphate, trisodium phosphate, phosphorous acid -Sodium salts such as sodium, disodium phosphite, sodium hypophosphite, monopotassium phosphate, dipotassium phosphate, tripotassium phosphate, monopotassium phosphite, dipotassium phosphite, hypophosphorous acid Potassium salts such as potassium, lithium salts such as phosphoric acid-lithium phosphate, dilithium phosphate, trilithium phosphate, phosphorous acid-lithium, dilithium phosphite, lithium hypophosphite, barium dihydrogen phosphate, phosphorus Barium salts such as barium oxyhydrogen, tribarium phosphate, and barium hypophosphite, magnesium monohydrogen phosphate, phosphoric acid water Magnesium salts such as magnesium, trimagnesium phosphate, magnesium hypophosphite, calcium salts such as calcium dihydrogen phosphate, calcium hydrogen phosphate, tricalcium phosphate, calcium hypophosphite, zinc phosphate, zinc phosphite, Examples thereof include zinc salts such as zinc hypophosphite.

The polyphosphate is not particularly limited, and examples thereof include ammonium polyphosphate, piperazine polyphosphate, melamine polyphosphate, ammonium amide polyphosphate, and aluminum polyphosphate.

Among these, since the self-extinguishing property of the phosphate-containing flame retardant is improved, it is preferable to use a monophosphate, and it is more preferable to use ammonium dihydrogen phosphate.

The phosphate-containing flame retardant can be used alone or in combination of two or more.

The amount of the phosphate-containing flame retardant used in the present invention is preferably in the range of 1.5 to 52 parts by weight with respect to 100 parts by weight of the urethane resin, and 1.5 to 20 parts by weight. More preferably, it is in the range of 2.0 parts by weight to 15 parts by weight, and most preferably in the range of 2.0 parts by weight to 10 parts by weight.

When the range of the phosphate-containing flame retardant is 1.5 parts by weight or more, the self-extinguishing property of the flame retardant urethane resin composition is maintained, and when it is 52 parts by weight or less, the flame retardant urethane resin composition Foaming is not hindered.

The bromine-containing flame retardant used in the present invention is not particularly limited as long as it is a compound containing bromine in the molecular structure, and examples thereof include aromatic brominated compounds.

Specific examples of the aromatic brominated compound include, for example, hexabromobenzene, pentabromotoluene, hexapromobiphenyl, decapromobiphenyl, hexapromocyclodecane, decapromodiphenyl ether, octabromodiphenyl ether, hexapromodiphenyl ether, bis (pentabromo Monomeric organic bromine compounds such as phenoxy) ethane, ethylene-bis (tetraprophtalimide), tetraprobisbisphenol A; polycarbonate oligomers produced from brominated bisphenol A as raw materials, copolymer of polycarbonate oligomer and bisphenol A Brominated polycarbonate such as diepoxy compounds produced by the reaction of brominated bisphenol A and epichlorohydrin, brominated phenols and epichlorohydride Brominated epoxy compounds such as monoepoxy compounds obtained by reaction with styrene; poly (brominated benzyl acrylate); brominated polyphenylene ether; condensates of brominated bisphenol A, cyanuric chloride and brominated phenol; brominated (polystyrene) And brominated polystyrene such as poly (brominated styrene) and crosslinked brominated polystyrene; and halogenated bromine compound polymers such as crosslinked or non-crosslinked brominated poly (-methylstyrene).

From the viewpoint of controlling the calorific value at the initial stage of combustion, brominated polystyrene, hexabromobenzene and the like are preferable, and hexabromobenzene is more preferable.

臭 素 One or more bromine-containing flame retardants can be used.

The addition amount of the bromine-containing flame retardant used in the present invention is preferably in the range of 1.5 to 52 parts by weight with respect to 100 parts by weight of the urethane resin, and 1.5 to 20 parts by weight. More preferred is a range of 2.0 parts by weight to 15 parts by weight, still more preferred is a range of 2.0 parts by weight to 10 parts by weight.

When the range of the bromine-containing flame retardant is 0.1 part by weight or more, the self-extinguishing property of the flame retardant urethane resin composition is maintained, and when the range is 52 parts by weight or less, foaming of the flame retardant urethane resin composition Is not disturbed.

Further, examples of the antimony-containing flame retardant used in the present invention include antimony oxide, antimonate, pyroantimonate, and the like.

Examples of the antimony oxide include antimony trioxide and antimony pentoxide.

Examples of the antimonate include sodium antimonate and potassium antimonate.

Examples of pyroantimonate include sodium pyroantimonate and potassium pyroantimonate.

The antimony-containing flame retardant used in the present invention is preferably antimony oxide.

Antimony-containing flame retardants can be used alone or in combination of two or more.

The addition amount of the antimony-containing flame retardant is preferably in the range of 1.5 to 52 parts by weight and more preferably in the range of 1.5 to 20 parts by weight with respect to 100 parts by weight of the urethane resin. More preferably, the range is from 2.0 parts by weight to 15 parts by weight, still more preferably from 2.0 parts by weight to 10 parts by weight.

When the range of the antimony-containing flame retardant is 1.5 parts by weight or more, the self-extinguishing property of the flame retardant urethane resin composition is maintained, and when it is 52 parts by weight or less, foaming of the flame retardant urethane resin composition Is not disturbed.

Examples of the metal hydroxide used in the present invention include magnesium hydroxide, calcium hydroxide, aluminum hydroxide, iron hydroxide, nickel hydroxide, zirconium hydroxide, titanium hydroxide, zinc hydroxide, copper hydroxide. , Vanadium hydroxide, tin hydroxide and the like.

1 type or 2 types or more can be used for a metal hydroxide.

The addition amount of the metal hydroxide is preferably in the range of 1.5 to 52 parts by weight and preferably in the range of 1.5 to 20 parts by weight with respect to 100 parts by weight of the urethane resin. More preferably, the range is from 2.0 parts by weight to 15 parts by weight, still more preferably from 2.0 parts by weight to 10 parts by weight.

When the range of the metal hydroxide is 1.5 parts by weight or more, the self-extinguishing property of the flame retardant urethane resin composition is maintained, and when it is 52 parts by weight or less, the foam of the flame retardant urethane resin composition is maintained. Is not disturbed.

In addition, the flame retardant urethane resin composition can be used in combination with an inorganic filler.

The inorganic filler is not particularly limited. For example, silica, diatomaceous earth, alumina, titanium oxide, calcium oxide, magnesium oxide, iron oxide, tin oxide, antimony oxide, ferrites, basic magnesium carbonate, calcium carbonate, carbonate Magnesium, zinc carbonate, barium carbonate, dosonite, hydrotalcite, calcium sulfate, barium sulfate, gypsum fiber, potassium salt of calcium silicate, talc, clay, mica, montmorillonite, bentonite, activated clay, sepiolite, imogolite, Sericite, glass fiber, glass beads, silica parun, aluminum nitride, boron nitride, silicon nitride, carbon black, graphite, carbon fiber, carbon parun, charcoal powder, various metal powders, potassium titanate, magnesium sulfate, zirconium titanate Emissions lead, aluminum port rate, molybdenum sulfide, silicon carbide, stainless steel fiber, various magnetic powder, slag fibers, fly ash, silica alumina fiber, alumina fiber, silica fiber, zirconia fiber, and the like.

Inorganic fillers can be used alone or in combination of two or more.

Furthermore, the flame retardant urethane resin composition is within a range that does not impair the object of the present invention, as necessary, such as phenol-based, amine-based, sulfur-based antioxidants, heat stabilizers, metal harm-preventing agents, charging agents. An inhibitor, a stabilizer, a crosslinking agent, a lubricant, a softener, a pigment, an auxiliary component such as a tackifier resin, and a tackifier such as polybutene and a petroleum resin can be included.

Since the flame retardant urethane resin composition reacts and cures, its viscosity changes over time. Therefore, before using the flame retardant urethane resin composition, the flame retardant urethane resin composition is divided into two or more to prevent the flame retardant urethane resin composition from reacting and curing. And when using a flame-retardant urethane resin composition, a flame-retardant urethane resin composition is obtained by putting together the flame-retardant urethane resin composition divided | segmented into two or more.

In addition, when dividing the flame retardant urethane resin composition into two or more, each component of the flame retardant urethane resin composition divided into two or more does not start to cure, and each of the flame retardant urethane resin composition Each component may be divided so that the curing reaction starts after the components are mixed.

The present invention includes (A) a first liquid containing a polyisocyanate compound, (B) a second liquid containing a polyol compound, (C) a trimerization catalyst, (D) a foaming agent, (E) a foam stabilizer and ( F) A system that is a combination or reaction system for forming a flame retardant urethane resin composition, including an additive, comprising a polyisocyanate compound, a polyol compound, a trimerization catalyst, a foaming agent, a foam stabilizer, and an additive The intensity ratio of the peak of the carbonyl group of the isocyanurate to the peak of the carbonyl group of the urethane as measured by ¹³ C NMR in the cured product of the flame retardant urethane resin composition produced by mixing 0.3 to 3. Also included is a system for forming a flame retardant urethane resin composition that is between 5.

Each of (C) trimerization catalyst, (D) foaming agent, (E) foam stabilizer and (F) additive may be contained in the first liquid or the second liquid, and the first liquid and It may be provided separately from the second liquid. Preferably, (C) the trimerization catalyst, (D) the foaming agent, (E) the foam stabilizer and (F) the additive are each contained in the second liquid. A system for forming a flame retardant urethane resin composition includes a first container that contains the first liquid and a second container that contains the second liquid, such as a caulking gun or a spray-type container. Provided.

Details of the components (A) to (F) and the flame-retardant urethane resin composition formed therefrom are as described above.

The method for producing the flame retardant urethane resin composition is not particularly limited. For example, the method of mixing the components of the flame retardant urethane resin composition, the flame retardant urethane resin composition suspended in an organic solvent, A method of heating and melting to form a paint, a method of preparing a slurry by dispersing in a solvent, etc., and a reaction curable resin component contained in a flame retardant urethane resin composition at a temperature of 25 ° C. When the component which is is contained, a flame-retardant urethane resin composition can be obtained by methods, such as melting a flame-retardant urethane resin composition under heating.

The flame retardant urethane resin composition is a known component such as a single screw extruder, a twin screw extruder, a Banbury mixer, a kneader mixer, a kneading roll, a laika machine, a planetary stirring machine, etc. It can be obtained by kneading using an apparatus.

Also, the urethane resin main component and the curing agent can be kneaded separately with a filler and the like, and kneaded with a static mixer, a dynamic mixer or the like immediately before injection.

Further, the components of the flame retardant urethane resin composition excluding the catalyst and the catalyst can be kneaded in the same manner immediately before injection. A flame-retardant urethane resin composition can be obtained by the method described above.

Next, a method for curing the flame retardant urethane resin composition according to the present invention will be described.

When the respective components of the flame retardant urethane resin composition are mixed, the reaction starts, the viscosity increases with the passage of time, and the fluidity is lost.

For example, the molded body made of the flame retardant urethane resin composition can be obtained as a foam by injecting the flame retardant urethane resin composition into a container such as a mold or a frame material and curing it.

When obtaining a molded body composed of the flame retardant urethane resin composition, heat or pressure can be applied.

The solid-state ¹³ C NMR shows the peak of the carbonyl group of isocyanurate and the peak of the carbonyl group of urethane in the obtained flame-retardant urethane resin composition after curing, that is, a sample of the cured product of the flame-retardant urethane resin composition. When measuring, the skin layer of the upper surface in the hardened | cured material of a flame-retardant urethane resin composition is avoided, and the part below a skin layer is measured. When measuring the hardened | cured material of the flame-retardant urethane resin composition applied to the wall surface etc., it is preferable to scrape off a sample from the part of 10% depth from the surface of hardened | cured material.

The molded body made of the flame retardant urethane resin composition preferably has a specific gravity in the range of 0.020-0.130 because it is easy to handle, and more preferably in the range of 0.030-0.100. , 0.030-0.080 is more preferable, and 0.040-0.060 is most preferable.

The cured flame retardant urethane resin composition of the present invention after curing is characterized by a specific spin-spin relaxation time. The spin-spin relaxation time (T2) obtained by the solid echo method using pulsed NMR is a measure representing the molecular mobility of a substance, and the larger the value, the higher the mobility.

The solid echo method is already well known and will not be described in detail, but is mainly used for measurement of samples with a short relaxation time such as glassy and crystalline polymers. In general, since the FID signal generated after a single 90 ° pulse attenuates according to exp (−t / T2), T2 which is the T2 relaxation time can be obtained from this. As an example of the measurement of the spin-spin relaxation time by pulse NMR, for example, J. et al. Chem. Phys. 82, 4327 (1985).

A method of analyzing the relationship between physical properties, phase separation structure and composition from the analysis result of pulse NMR is well known, and spin-spin relaxation time T2 is obtained by free induction decay (FID) signal obtained by pulse NMR by the least square method. For example, in the case of a crystalline polymer, three components, that is, a first component having a short relaxation time (T2S), a first component having a relaxation time, It can be divided into a second component having a longer spin-spin relaxation time (T2L), a third component that is an intermediate component between the first component and the second component, and a Gaussian function and a Lorentz type The amount of each component can be determined using a calculation formula using a function or exponential function (for example, “polyurethane by solid-state NMR (high resolution NMR and pulsed NMR) Phase separation structure analysis of fat "(DIC Technical Review N.12, pp.7 ~ 12,2006) see).

The pulse NMR measurement will be described in detail as follows. First, when a sample of a powder sample that has been frozen and crushed to a height of 1 to 2 cm is placed in a magnetic field in a glass tube having a diameter of 1 cm, the relaxation behavior of the macroscopic magnetization after applying a high-frequency pulsed magnetic field is measured. A free induction decay (FID) signal is obtained (horizontal axis: time (msec), vertical axis: free induction decay signal intensity). The initial value of the obtained FID signal is proportional to the number of protons in the measurement sample, and when the measurement sample has three components, the FID signal appears as the sum of response signals of the three components. On the other hand, since each component contained in the sample has a difference in mobility, the speed of decay of the response signal differs among the components, and the spin-spin relaxation time T2 differs. Therefore, it can be divided into three components by the method of least squares. For example, in the case of a crystalline polymer, an amorphous phase (L component), an interface phase (M component), a crystal, respectively, in order from the longer spin-spin relaxation time T2. It becomes a phase (S component).

In this specification, by using the Gauss-Decay extended method, the attenuation curve obtained by measurement is regarded as the sum of two Gaussian functions and simplified to two components, a hard component and a soft component. Since it was found that there is a correlation between the T2 value of the component and the signal intensity fraction of the two components and the physical property value such as the shape retention of the flame retardant urethane resin composition of the present invention, it is analyzed as two components. . Also in the flame-retardant urethane resin composition of the present invention, the lower the T2 and the lower the proportion of the amorphous phase, the harder the polyurethane.

In this specification, the spin-spin relaxation time (T2S) of the hard component (first component) measured at 150 ° C. using pulsed NMR at ¹ ° C. and the observation nucleus is 0.01 ms to 0.1 ms. It is assumed that the spin-spin relaxation time (T2L) of the soft component (second component) is between 0.1 ms and 1.0 ms. It is not practical that the spin-spin relaxation time (T2S) of the first component is shorter than 0.01 milliseconds, and if the spin-spin relaxation time (T2S) of the first component is longer than 0.1 milliseconds, The flame retardant urethane resin composition becomes too soft and it becomes difficult to maintain a certain shape by heat such as flame, resulting in poor shape retention. If the spin-spin relaxation time (T2L) of the second component is longer than 1.0 milliseconds, it is not practical.

In the flame-retardant urethane resin composition of the present invention, the fraction of the signal intensity in the spin-spin relaxation time (T2S) of the first component measured at 150 ° C. using pulsed NMR and the observation nucleus is ¹ H is the second. More than the fraction of the signal intensity in the component spin-spin relaxation time (T2L). The pulse NMR measurement of the flame retardant urethane resin composition of the present invention is performed after the temperature is stabilized after heating. In one embodiment, the flame retardant urethane resin composition of the present invention performs a pulse NMR measurement 10 minutes after the composition sample is charged, that is, after heating at 150 ° C. is started.

The spin-spin relaxation time slightly changes depending on the magnetic field strength used, but is included in the present invention regardless of the magnitude of the magnetic field strength.

In one embodiment, the flame retardant urethane resin composition comprises a trimerization catalyst in the range of 0.1 to 10 parts by weight based on 100 parts by weight of the urethane resin composed of the polyisocyanate compound and the polyol compound; 1 to 30 parts by weight of a foaming agent, 0.1 to 10 parts by weight of a foam stabilizer, and 4.5 to 70 parts by weight of an additive, using pulsed NMR The spin-spin relaxation time (T2S) of the first component measured at 150 ° C. and the observation nucleus at ¹ H is between 0.01 milliseconds and 0.1 milliseconds, and the observation nucleus is measured at ¹ H. The component spin-spin relaxation time (T2L) is between 0.1 ms and 1.0 ms, in particular between 0.1 ms and 0.95 ms, and the signal strength of the first component is The fraction is greater than the fraction of signal strength in the second component.

In another embodiment, the spin-spin relaxation time (T2L) of the second component measured at ¹ H for the observation nucleus is between 0.15 ms and 1 ms, and in yet another embodiment 0.15 Between seconds and 0.95 milliseconds.

In another embodiment, the signal strength fraction in the first component is greater than 70% (the signal strength fraction in the second component is less than 30%), more preferably greater than 75% (the signal strength in the second component. Is less than 25%), more preferably more than 80% (the signal intensity fraction in the second component is less than 20%).

Next, application examples of the flame retardant urethane resin composition according to the present invention will be described.
By blowing the flame retardant urethane resin composition onto a structure such as a building, furniture, automobile, train, ship, etc., a foam layer made of the flame retardant urethane resin composition is formed on the surface of the structure. be able to.

For example, the flame retardant urethane resin composition is divided into a polyisocyanate compound and other components, mixed while spraying both, and sprayed onto the surface of the structure, the polyisocyanate compound, Examples thereof include a method of spraying the surface of the structure after mixing with other components. By the above method, a foam layer can be formed on the surface of the structure.

Next, a fire resistance test performed on the fiber-reinforced resin molded product of the present invention will be described.

A molded product made of a flame retardant urethane resin composition is cut into a length of 10 cm, a width of 10 cm, and a thickness of 5 cm to prepare a sample for a corn calorimeter test.

Using the sample for corn calorimeter test, the total calorific value by the corn calorimeter test when heated at a radiant heat intensity of 50 kW / m ^{2 for} 20 minutes can be measured according to the test method of ISO-5660.

Hereinafter, the present invention will be described more specifically with reference to examples, but the present invention is not limited to these examples.

1. Production of Flame Retardant Urethane Resin Composition Flame retardant urethane resin compositions according to Examples 1 to 3 and Comparative Example 1 were prepared according to the formulation shown in Table 1. Details of each component in the table are as follows.
・ Polyol compound (hereinafter referred to as “polyol”)
(A-1) p-phthalic acid polyester polyol (manufactured by Kawasaki Chemical Industries, Ltd., product name: Maximol RFK-505, hydroxyl value = 250 mgKOH / g)
(A-2) p-phthalic acid polyester polyol (manufactured by Kawasaki Kasei Kogyo Co., Ltd., product name: Maximol RF K-087, hydroxyl value = 200 mgKOH / g)
・ Foam stabilizer Polyalkylene glycol foam stabilizer (manufactured by Toray Dow Corning, product name: SH-193)
-Trimerization catalyst (B-1) Trimerization catalyst (Momentive Performance Material Japan, product name: K-zero G)
(B-2) Trimerization catalyst (manufactured by Tosoh Corporation, product name: TOYOCAT-TR20)
Urethane catalyst (B-3) Pentamethyldiethylenetriamine (Tosoh Corporation, product name: TOYOCAT-DT)
-Foaming agent (C-1) Water (C-2) HFC HFC-365mfc (1,1,1,3,3-pentafluorobutane, manufactured by Solvay Japan) and HFC-245fa (1,1,1,3) , 3-pentafluoropropane (manufactured by Central Glass Co., Ltd.), mixing ratio HFC-365mfc: HFC-245fa = 7: 3, hereinafter referred to as “HFC”)
・ Isocyanate compound (hereinafter referred to as “polyisocyanate”)
MDI (manufactured by Nippon Urethane Industry Co., Ltd., product name: Millionate MR-200) Viscosity: 167 mPa · s
Additive (D-1) Tris (β-chloropropyl) phosphate (manufactured by Daihachi Chemical Co., Ltd., product name: TMCPP, hereinafter referred to as “TMCPP”)
(D-2) Red phosphorus (Product name: Nova Excel 140, manufactured by Rin Chemical Industry Co., Ltd.)
(D-3) Ammonium dihydrogen phosphate (manufactured by Taihei Chemical Industrial Co., Ltd.)
(D-4) Hexabromobenzene (manufactured by Manac, product name: HBB-b, hereinafter referred to as “HBB”).

In accordance with the formulation shown in Table 1 below, the polyol compound, foam stabilizer, various catalysts, the foaming agent excluding the HFC component, and additives were weighed into a 1000 mL polypropylene beaker and stirred by hand mixing at 25 ° C. for 1 minute. A polyisocyanate compound and HFC were added to the kneaded material after stirring, and a foam was made by worshiping with a hand mixer for about 10 seconds. The obtained flame-retardant urethane resin composition lost its fluidity with time, and the foams of the cured flame-retardant urethane resin compositions of Examples 1 to 3 and Comparative Example 1 were obtained.
2. Evaluation of Flame Retardancy of Foam The above foam was evaluated according to the following criteria, and the results are shown in Table 1 (the ratio of each component is expressed in parts by weight relative to 100 parts by weight of polyisocyanurate resin).
[Measurement of calorific value]
A sample for corn calorimeter test is cut out from the cured product so as to be 10 cm × 10 cm × 5 cm, and the maximum heat generation rate and total heat generation when heated for 20 minutes at a radiant heat intensity of 50 kW / m ² in accordance with ISO-5660 The results of measuring are shown in Table 1.

This measurement method is a test method stipulated as corresponding to the standard by the corn calorimeter method at the Building Research Institute, which is a public institution prescribed in Article 108-2 of the Building Standard Law Enforcement Order, It conforms to the test method of ISO-5660.

Although the total amount of heat generated by the cone calorimeter at a heating for 20 minutes is acceptable in the case of 8 MJ / m ² or less, 8 MJ / m ² at a heating FAIL, 20 minutes what is in excess of 8 MJ / m ² at a heating for 20 minutes in this study The following was designated as PASS.

3. Evaluation of shape retention of heating element When the test of ISO-5660 is carried out, whether the molded body after expansion comes into contact with the igniter (measurement of expansion), deformation that reaches the back surface of the test sample. Whether or not the deformation is observed (deformation measurement), and whether or not deformation of 1 cm or more in the lateral direction and 5 mm or more in the thickness direction is observed in the test sample when the test of ISO-5660 is performed (measurement of shrinkage) Was measured.

In Example 1-6, expansion, deformation, and contraction were all acceptable, and in Comparative Examples 1 and 2, at least one of expansion, deformation, and contraction was unacceptable.
4). Measurement by Pulsed NMR The cured material samples of each flame retardant polyurethane resin composition of Examples 1 to 6 and Comparative Examples 1 and 2 were measured by solid echo method using pulsed NMR. In this measurement, a freeze-pulverized powdery sample was packed in a glass tube having a diameter of 1 cm to a height of 1 to 2 cm, and a solid-echo method was used using a pulse NMR measurement apparatus (MINISPEC mq20, 25 MHz, manufactured by Bruker BioSpin). Then, the repetition time: 4 s, the number of integration: 256 times, the temperature: 150 ° C., the measurement start time: (until the temperature stabilizes) Measurement is performed at the start of measurement 10 minutes after the sample is charged.

The obtained attenuation curve is calculated from T2 (spin-spin relaxation time) by the least square method, from the spin-spin relaxation time (T2S) of the first component of the sample and the spin-spin relaxation time (T2L) of the second component. And asked. The measurement results are shown in Table 2. In the flame-retardant polyurethane resin compositions of Examples 1 to 6, the spin-spin relaxation time (T2S) of the first component is between 0.01 milliseconds and 0.1 milliseconds, and the spin of the second component The spin relaxation time (T2L) was between 0.1 ms and 0.95 ms. The flame retardant polyurethane resin compositions of Examples 1 to 6 and the flame retardant polyurethane resin compositions of Comparative Examples 1 and 2 were clearly distinguished by measurement at 150 ° C.

Claims (8)

1. A flame retardant urethane resin composition comprising a polyisocyanate compound, a polyol compound, a trimerization catalyst, a foaming agent, a foam stabilizer, and an additive, wherein a pulse NMR is measured in a cured product of the flame retardant urethane resin composition. The spin-spin relaxation time (T2S) of the first component measured at 150 ° C. by the solid echo method and the observation nucleus at ¹ H is between 0.01 ms and 0.1 ms, and the second component The spin-spin relaxation time (T2L) is between 0.1 ms and 1.0 ms, and the signal intensity fraction of the first component is greater than the signal intensity fraction of the second component. Flammable urethane resin composition.
2. The flame retardant according to claim 1, wherein the additive comprises at least one selected from red phosphorus, phosphate ester, phosphate-containing flame retardant, bromine-containing flame retardant, antimony-containing flame retardant, and metal hydroxide. Urethane resin composition.
3. The flame retardant urethane resin composition according to claim 1, wherein the additive is in the range of 4.5 to 70 parts by weight based on 100 parts by weight of the urethane resin comprising the polyisocyanate compound and the polyol compound. .
4. The flame retardant urethane resin composition according to claim 1, wherein the trimerization catalyst is in the range of 0.1 to 10 parts by weight based on 100 parts by weight of the urethane resin comprising the polyisocyanate compound and the polyol compound.
5. The flame retardant according to any one of claims 1 to 4, wherein the foaming agent is in a range of 0.1 to 30 parts by weight based on 100 parts by weight of a urethane resin composed of the polyisocyanate compound and the polyol compound. Urethane resin composition.
6. The flame retardant urethane resin composition according to any one of claims 1 to 5, wherein a fraction of the signal intensity in the first component exceeds 80% and a fraction of the signal intensity in the second component is less than 20%. object.
7. The flame retardant urethane resin composition according to any one of claims 1 to 6, having an isocyanate index of 125 or more.
8. (A) 1st liquid containing polyisocyanate compound, (B) 2nd liquid containing polyol compound, (C) trimerization catalyst, (D) foaming agent, (E) foam stabilizer and (F) additive In the cured product of the flame retardant urethane resin composition, the spin-spin relaxation time (T2S) of the first component measured at 150 ° C. by solid echo method using pulsed NMR and the observed nucleus at ¹ H is 0. .01 ms to 0.1 ms, the second component spin-spin relaxation time (T2L) is between 0.1 ms to 1.0 ms, and the first component signal A combination for forming a flame-retardant urethane resin composition having a strength fraction greater than the signal strength fraction of the second component.