JP2007217648A - Composition for forming water-foamed rigid polyisocyanurate foam, method for producing water-foamed rigid polyisocyanurate foam using the composition, and water-foamed rigid polyisocyanurate foam obtained by the production method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To use a composition for forming a rigid polyisocyanurate foam, which uses only water as a foaming agent and exhibits excellent flame retardancy and adhesiveness and can be obtained in combination with low density. It is an object of the present invention to provide a method for producing a water-foamed rigid polyisocyanurate foam, and a water-foamed rigid polyisocyanurate foam obtained by the production method.
SOLUTION: An organic polyisocyanate containing MDI and an MDI-based polynuclear condensate, a poly (oxypropylene) polyol having a number average molecular weight of 600 or less, and a polyether mono having an oxyethylene group content of 20% by mass or less in a repeating unit. Using an organic polyisocyanate composition composed of an isocyanate group-terminated prepolymer obtained by reacting all, a liquid low molecular weight ester compound at room temperature, and a polydimethylsiloxane-polyether copolymer, and a tetraalkoxysilane By using it, the above-mentioned problems are solved.
[Selection figure] None

Description

  The present invention relates to a composition for forming a rigid polyisocyanurate foam using only water as a foaming agent, a method for producing a water-foamed rigid polyisocyanurate foam using the composition, and an excellent difficulty obtained by the production method. The present invention relates to a water-foamed rigid polyisocyanurate foam exhibiting flammability.

  Rigid polyisocyanurate foam has an isocyanurate ring structure obtained by trimerization of isocyanate compounds and is superior in flame retardancy than rigid polyurethane foam. -As a concrete example, such as an outer wall material and a door, it is generally widely used as a core material in an outer wall material having a heat insulating performance using a color steel plate as a face material.

  In recent years, from the viewpoint of protecting the global environment, carbon dioxide generated by the reaction of isocyanate and water without using organic compounds such as hydrofluorocarbons and hydrocarbons as foaming agents as well as chlorofluorocarbons and hydrochlorofluorocarbons Rigid polyisocyanurate foams that use a technique that uses as a foaming agent, that is, hard polyisocyanurate foams that use only water as the foaming agent, are in the limelight. However, when only water is used as a foaming agent, there is a drawback that poor adhesion to the face material due to an increase in urea bonds due to the reaction between water and isocyanate is likely to occur. For example, when manufacturing the aforementioned outer wall material However, the problem of so-called peeling of the face material is likely to occur.

  On the other hand, the evaluation of flame retardancy has conventionally been performed mainly in accordance with JIS A1321. However, a new flame retardant standard was shown in June 2000 following the revision of the construction standard of the Building Standards Act and the ministerial ordinance / notification promulgation. In fact, a testing organization accredited by the Ministry of Land, Infrastructure, Transport and Tourism proposes a testing method to the Ministry, and its content is substantially evaluated by exothermic tests using a cone calorimeter tester conforming to ISO 5660 (and non-combustible, Three ranks of quasi-incombustible and flame-retardant).

To be rated as non-flammable, the total calorific value is 8 MJ / m ² or less in a 20-minute test with a heating intensity of 50 kW / m ² in a corn calorimeter test according to ISO 5660, and the maximum heat release rate. Is required not to exceed 200 kW / m ² continuously for 10 seconds or more, and to prevent cracks and holes penetrating to the back side which is harmful to fire prevention.

In order to be rated as quasi-incombustible, the total calorific value is 8 MJ / m ² or less in the test using a cone calorimeter in accordance with ISO 5660 and the heating intensity is 50 kW / m ² for 10 minutes. It is required that the speed does not exceed 200 kW / m ² continuously for 10 seconds or more, and no cracks and holes penetrating to the back side which are harmful to fire prevention.

In order to be rated as flame retardant, the total calorific value is 8 MJ / m ² or less in a 5-minute test with a heating intensity of 50 kW / m ² in a test with a corn calorimeter in accordance with ISO 5660. It is required that the maximum heat generation rate does not exceed 200 kW / m ² continuously for 10 seconds or more and that cracks and holes penetrating to the back side which are harmful to fire prevention do not occur.

  As a rigid polyurethane foam that can be evaluated as flame retardant or semi-incombustible by such an exothermic test, for example, Patent Document 1 is currently known. However, the rigid polyurethane foam in Patent Document 1 uses HFC245fa, HFC365mfc, HFC227ea, and HFC134a as foaming agents, and even when only water is used as the foaming agent, it is evaluated as flame retardant or semi-incombustible. There is no description, and for example, there is no description about adhesiveness with a color steel plate.

JP 2003-160628 A

  The present invention has been made based on such a series of backgrounds. That is, the present invention has good adhesion to the color steel plate, and when a sandwich structure is formed using a face material, a quasi-incombustibility or non-combustion evaluation is obtained in a test using a cone calorimeter in accordance with ISO 5660. , A composition for forming a rigid polyisocyanurate foam based on the premise that only water is used as a foaming agent, a method for producing a water-foamed rigid polyisocyanurate foam using the composition, and water obtained by the production method An object is to provide a foamed rigid polyisocyanurate foam.

  As a result of intensive studies to solve these problems, the present inventors have found that these problems can be solved by using a composition for forming a water-foamed hard polyisocyanurate foam having a specific configuration, The present invention has been completed.

  Above all, as one of the components constituting a specific configuration, when (G) tetraalkoxysilane is introduced, the above-mentioned sandwich structure test specimen with face material is tested with a cone calorimeter based on ISO 5660, when not introduced As a result, it has been found that the evaluation of quasi-incombustibility or incombustibility can be obtained more reliably (that is, the flame retardancy performance is further improved), and the present invention has been completed.

  In addition, it is possible to reduce the density of the obtained water-foamed rigid polyisocyanurate foam (that is, it is found that productivity (for example, the filling property at the time of manufacturing a sandwich panel having a specific structure is further improved), The present invention has been completed.

  That is, this invention is shown by the following (1)-(3).

(1) Organic polyisocyanate composition (A),
Polyol (B),
A catalyst (C) containing an isocyanurate-forming catalyst (c1),
Water (D) as blowing agent,
Foam stabilizer (E),
Flame retardant (F), and tetraalkoxysilane (G)
A water-foaming rigid polyisocyanurate foam-forming composition comprising:
The organic polyisocyanate composition (A) is added to an organic polyisocyanate (a1) containing diphenylmethane diisocyanate (a1x) and a diphenylmethane diisocyanate polynuclear condensate (a1y), and a poly (oxypropylene) polyol having a number average molecular weight of 600 or less (a2 ), And an isocyanate group-terminated prepolymer (A1) obtained by reacting a polyether monool (a3) having an oxyethylene group content of 20% by mass or less in a repeating unit comprising an oxyalkylene group, a room temperature liquid low molecular ester system Compound (A2), and polydimethylsiloxane-polyether copolymer (A3) which may be reacted with (a1),
The water-foamed hard polyisocyanate characterized in that the polyol (B) comprises 50% by mass or more of the phthalic polyester polyol (b1) and less than 50% by mass of the polyol (b2) other than the phthalic polyester polyol A composition for forming a nurate foam.

(2) A method for producing a water-foamed rigid polyisocyanurate foam, wherein the composition according to (1) is used.

(3) The total calorific value in the test with a cone calorimeter based on ISO 5660 obtained by the production method described in (2) is 15 MJ / m ² or less in 10 minutes at a heating intensity of 50 kW / m ² , and The water-foamed rigid polyisocyanurate foam is characterized in that the maximum heat generation rate during the 10 minutes is 200 kW / m ² or less.

  According to the present invention, even when only water is used as a foaming agent from the viewpoint of protecting the global environment, the adhesiveness with the color steel plate is good, the flame retardancy is excellent, and the sandwich structure using the face material is used. In this case, it is possible to obtain a water-foamed rigid polyisocyanurate foam that can more reliably obtain a quasi-incombustibility or non-combustion evaluation in a test using a corn calorimeter in accordance with ISO5660.

  In addition, since the density of the obtained water-foamed rigid polyisocyanurate foam can be reduced according to the present invention, for example, the complex structure of the water-foamed rigid polyisocyanurate foam used as a filler during sandwich panel production As a result, it is possible to reduce the amount of raw material used as necessary (cost reduction). At the same time, this reduction in density makes it possible to reduce the amount of water used as a blowing agent in order to obtain a desired foam density. Therefore, water that has been known in various literatures is used as a blowing agent. The deviation of the blending ratio at the time of two-component foaming due to the isocyanate group-containing component and the active hydrogen-containing group-containing component (and the occurrence of poor mixing during foam production) can also be led to the elimination direction.

  The organic polyisocyanate composition (A) in the present invention is a poly (oxypropylene) having a number average molecular weight of 600 or less to an organic polyisocyanate (a1) containing diphenylmethane diisocyanate (a1x) and a diphenylmethane diisocyanate polynuclear condensate (a1y). An isocyanate group-terminated prepolymer (A1) obtained by reacting a polyol (a2) and a polyether monool (a3) having an oxyethylene group content of 20% by mass or less in the repeating unit; The same applies hereinafter.) The liquid low molecular weight ester compound (A2) and the polydimethylsiloxane-polyether copolymer (A3) which may be reacted with (a1).

  The organic polyisocyanate (a1) provided for the isocyanate group-terminated prepolymer (A1) of the present invention is diphenylmethane diisocyanate (hereinafter abbreviated as “MDI”) having two benzene rings and two isocyanate groups each called a so-called dinuclear body. .) (A1x) and a diphenylmethane diisocyanate-based polynuclear condensate (hereinafter abbreviated as “MDI-based condensate”) (a1y) having three or more benzene rings and isocyanate groups each called a so-called polynuclear body. It means a mixture of organic isocyanate compounds having different degrees of condensation obtained by converting an amino group to an isocyanate group by phosgenation or the like of a condensation mixture (polyamine) obtained by a condensation reaction of aniline and formalin. Organic polyisocyanate (a1) can change the composition (nuclear body distribution and isomer composition ratio) of the organic polyisocyanate finally obtained by changing the raw material composition ratio and reaction conditions at the time of condensation. The organic polyisocyanate (a1) used in the present invention is a reaction solution such as a reaction solution after conversion to an isocyanate group, removal of the solvent from the reaction solution, a bottom solution obtained by distilling and separating part of MDI, and the like. It may be a mixture of several different types. Moreover, what mixed MDI with the commercially available organic polyisocyanate (it may be called "polymeric MDI") may be used.

  The organic polyisocyanate (a1) has a peak area ratio of MDI in gel permeation chromatography (hereinafter abbreviated as “GPC”) of 20 to 70%, preferably 25 to 65%. . When the peak area ratio of MDI exceeds 70%, the strength of the resulting water-foamed rigid polyisocyanurate foam is lowered, and for example, when a core material of an outer wall material is used, a problem such as partial shrinkage occurs. Further, the resulting water-foamed rigid polyisocyanurate foam is apt to be brittle, and in some cases the adhesiveness is inferior. On the other hand, when the peak area ratio of MDI is less than 20%, the viscosity of the obtained organic polyisocyanate composition (A) is increased, and, for example, problems such as failure to fill the terminal portion occur in the outer wall material production process. Absent.

  The isomers constituting MDI (a1x) contained in the organic polyisocyanate (a1) are 2,2′-diphenylmethane diisocyanate (hereinafter abbreviated as “2,2′-MDI”), 2,4′-diphenylmethane diisocyanate. (Hereinafter abbreviated as “2,4′-MDI”) and 4,4′-diphenylmethane diisocyanate (hereinafter abbreviated as “4,4′-MDI”). The isomer composition ratio of MDI is not particularly limited, but the water-foamed hard polyisocyanurate obtained when the 4,4′-MDI content is 70% by mass or more (preferably 90 to 99.9% by mass) is obtained. This is preferable because the physical properties of the foam are improved. The MDI content and the MDI isomer composition ratio in the organic polyisocyanate (a1) are obtained from a calibration curve based on the area percentage of each peak obtained by GPC or gas chromatography (hereinafter abbreviated as “GC”). be able to.

  Moreover, the average functional group number of organic polyisocyanate (a1) is 2.3 or more, Preferably the functional group number is 2.3-3.1. The isocyanate group content is 28 to 33% by mass, preferably 28.5 to 32.5% by mass.

  Further, from the viewpoint of storage stability and reactivity of the obtained organic polyisocyanate composition (A), the acidity of the organic polyisocyanate (a1) is preferably 0.001 to 0.2% by mass, and more preferably 0.003. It is -0.15 mass%. When the acidity is less than 0.001%, the resulting organic polyisocyanate composition (A) is likely to increase in viscosity during storage (liquidity changes with time). Moreover, when acidity exceeds 0.2%, reaction with a polyol will become slow and it will become easy to produce defective hardening when obtaining a water foaming rigid polyisocyanurate foam.

  The acidity mentioned above is a value obtained by converting an acid component that reacts with alcohol at room temperature and liberated into hydrogen chloride, and is a value measured according to JIS K-1603.

  In this invention, isocyanate components other than the above-mentioned organic polyisocyanate (a1) can be used together as needed. Examples of the isocyanate component that can be used in combination include urethanized products, ureaized products, allophanated products, biuretized products, carbodiimidized products, uretoniminates, uretdioneized products obtained by reacting MDI and MDI-based condensates with active hydrogen group-containing compounds, Isocyanurate or 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, xylene-1,4-diisocyanate, xylene-1,3-diisocyanate, tetramethylxylene diisocyanate, m-phenylene diisocyanate, p-phenylene Fats such as aromatic diisocyanates such as diisocyanate, tetramethylene diisocyanate, hexamethylene diisocyanate, 3-methyl-1,5-pentane diisocyanate, lysine diisocyanate Family diisocyanate, isophorone diisocyanate, hydrogenated tolylene diisocyanate, hydrogenated xylene diisocyanate, alicyclic diisocyanates such as hydrogenated diphenylmethane diisocyanate. Also, urethanized products, urea compounds, allophanate compounds, biuret compounds, carbodiimide compounds, uretoniminate compounds, uretdiion compounds, isocyanurate compounds obtained by reacting these polymeric substances and these isocyanates with active hydrogen group-containing compounds described later. And a mixture of two or more of these.

  The poly (oxypropylene) polyol (hereinafter abbreviated as “PPG-based modifier”) (a2) having a number average molecular weight of 600 or less (preferably 400 or less) provided to the isocyanate group-terminated prepolymer (A1) of the present invention is: This improves the compatibility of a polyether monool (a3) having an oxyethylene group content of 20% by mass or less in a repeating unit composed of an oxyalkylene group, which will be described later, and a room temperature liquid low molecular ester compound (A2). Essentially, the polyether monool (a3) having an oxyethylene group content of 20% by mass or less in the repeating unit and the room temperature liquid low molecular weight ester compound (A2) are not compatible, but the PPG modifier (a2) is used. Thus, the organic polyisocyanate composition (A) can be obtained without causing turbidity (in some cases, causing phase separation and non-uniformity).

  When the number average molecular weight of the PPG-based modifier (a2) exceeds 600, the viscosity of the resulting organic polyisocyanate composition (A) increases, resulting in problems such as failure to fill the end portion in the outer wall material manufacturing process. So it is not preferable.

  The PPG modifier (a2) has a structure in which propylene oxide is added to a low molecular weight alcohol and contains dipropylene glycol (hereinafter abbreviated as “DPG”) (DPG adds propylene oxide to propylene glycol). Corresponds to the structure). Examples of the low-molecular alcohol include methanol, ethanol, propanol (including various isomers), butanol (including various isomers), pentanol (including various isomers), and hexanol (including various isomers). Molecular monools, glycols such as ethylene glycol, propylene glycol (including various isomers), butanediol (including various isomers), pentanediol (including various isomers), hexanediol (including various isomers), etc. , Triols such as glycerin and trimethylolpropane, and tetraols such as pentaerythritol.

  Polyether monool (hereinafter referred to as “ether”) having an oxyethylene group content of 20% by mass or less (preferably 15% by mass or less) in the repeating unit comprising an oxyalkylene group provided for the isocyanate group-terminated prepolymer (A1) of the present invention Abbreviated as “system modifier”.) (A3) has a group of the general formula: R—O— at the terminal which is not a hydroxyl group. This R may contain elements other than carbon and hydrogen, and it does not matter whether there is a side chain. Specific examples of R include, for example, methyl group, ethyl group, n-propyl group, i-propyl group, n-butyl group, i-butyl group, t-butyl group, phenyl group, benzyl group, N -Methyl-N-ethylamino group, N, N-diethylamino group, octyl group and the like. Note that R is preferably a hydrocarbon group having 3 or more carbon atoms.

  Moreover, it is preferable that the number average molecular weights of an ether type modifier (a3) are 150-10,000. When the number average molecular weight of the ether-based modifier (a3) is too low and / or when the oxypropylene group content is too low, the reactivity and foaming efficiency (decrease in density) in obtaining a water-foamed rigid polyisocyanurate foam are reduced. ) And a decrease in adhesiveness to the face material, etc. are likely to occur. On the other hand, when the number average molecular weight of the ether-based modifier (a3) is too high, the viscosity of the obtained organic polyisocyanate composition (A) is increased, and, for example, in the manufacturing process of the outer wall material, the terminal portion is not filled. Is likely to occur.

  The ether modifier (a3) used in the present invention has a number average molecular weight of 300 to 8,000, a hydrocarbon group having 3 to 20 carbon atoms at the terminal, and the composition of the repeating unit is an oxyethylene group (hereinafter referred to as necessary). Accordingly, it is preferably abbreviated as “EO” / oxypropylene group (hereinafter abbreviated as “PO” if necessary) = 20/80 to 0/100. Among them, a polysiloxane having a number average molecular weight of 500 to 5,000, a hydrocarbon group having 3 to 10 carbon atoms at the terminal, and a composition of a repeating unit of oxyethylene group / oxypropylene group = 15/85 to 0/100, (Oxyethylene-oxypropylene) copolymer monool or poly (oxypropylene) monool is particularly preferred.

  In the present invention, in addition to the PPG modifier (a2) and the ether modifier (a3) used for the isocyanate group-terminated prepolymer (A1), as a modifier, for example, methanol, ethanol, etc. Such as low molecular weight monools such as ethylene glycol, trimethylolpropane, pentaerythritol, sorbitol, sucrose, low molecular weight polyamines such as ethylamine, butylamine, monoethanolamine, diethanolamine, triethanolamine, etc. Low molecular amino alcohols can be used.

  The room-temperature liquid low molecular ester compound (A2) used in the organic polyisocyanate composition (A) of the present invention is an organic compound that is liquid at room temperature and has an “ester group”. The “ester group” as used herein has a molecular structure in which hydrogen of an organic acid or inorganic acid is substituted with a general formula: R (R: organic group), and the organic acid or inorganic acid is a carboxylic acid. Not limited. The room temperature liquid low molecular weight ester compound (A2) not only brings about a viscosity-reducing action in the organic polyisocyanate composition (A), but also contributes to an improvement in adhesion to the face material in the resulting water-foamed rigid polyisocyanurate foam. To do.

  Examples of room temperature liquid low molecular weight ester compounds (A2) include carboxylic acid ester compounds such as ethyl acetate, butyl acetate, dibutyl phthalate, dimethyl adipate, and ε-caprolactone, dimethyl carbonate, diethyl carbonate, propylene carbonate, and the like. Examples thereof include carbonate (carbonate ester) compounds, phosphate (phosphate ester) compounds such as trimethyl phosphate and triethyl phosphate. In the present invention, it is preferable to select and use a cyclic carbonate compound.

  The polydimethylsiloxane-polyether copolymer (hereinafter abbreviated as “silicone additive”) (A3) used in the organic polyisocyanate composition (A) of the present invention has a dimethylpolysiloxane structure and a poly It is a block copolymer having an oxyalkylene structure (polyether structure), and the number average molecular weight is preferably 500 to 20,000, more preferably 1,000 to 18,000. When the number average molecular weight is too large, the viscosity of the silicone-based additive (A3) itself is high, and it becomes difficult to handle, for example, when the isocyanate group-terminated prepolymer (A1) is not uniformly dispersed.

  When the silicone-based additive (A3) is provided to the organic polyisocyanate composition (A) of the present invention, the organic polyisocyanate composition of the present invention is uniformly mixed and dispersed with the organic polyisocyanate (a1). (A) may be interposed between the organic polyisocyanate (A1) and the organic polyisocyanate composition (A1) in a state of being mixed and dispersed uniformly with the organic polyisocyanate (a1) after being reacted in advance. It may be interposed.

  The average number of functional groups (average number of active hydrogen groups in one molecule) of the silicone-based modifier (A3) is preferably 1 to 10, more preferably 1 to 5, and particularly preferably 1 to 2. When the average functional group number is too small, the average functional group number of the obtained organic polyisocyanate composition (A) is also lowered, and the foam physical properties tend to be insufficient. On the other hand, when the number of average functional groups is too large, the viscosity of the resulting organic polyisocyanate composition (A) increases, and problems such as failure to fill up to the terminal portion in the outer wall material manufacturing process are likely to occur.

  In addition, the active hydrogen group of the silicone-based modifier (A3) is preferably a functional group selected from a hydroxyl group, an amino group, a carboxyl group, and a mercapto group, and in particular, the viscosity and compatibility of the resulting organic polyisocyanate composition (A). Furthermore, in consideration of aspects such as dispersibility, a hydroxyl group is most preferable.

  Furthermore, the hydroxyl value of the silicone-based modifier (A3) is preferably 3 to 300 mgKOH / g, and more preferably 3 to 50 mgKOH / g. When the hydroxyl value is extremely low, the viscosity of the silicone-based modifier (A3) itself is high and the isocyanate group-terminated prepolymer (A1) is not uniformly dispersed when it is synthesized. The strength of the water-foamed rigid polyisocyanurate foam is likely to be reduced. Moreover, when a hydroxyl value exceeds the upper limit of a preferable range, the dispersibility of the organic polyisocyanate composition (A) obtained and water (D) as a foaming agent tends to deteriorate.

  Here, when the silicone type modifier (A3) used in the present invention is exemplified, polysiloxane-polyoxyalkylene copolymers represented by the following general formulas (1) to (9) may be mentioned.

  Regarding the organic polyisocyanate composition (A) in the present invention, first, raw materials other than the organic polyisocyanate (a1), that is, PPG-based modifier (a2), ether-based modifier (a3), room temperature liquid low molecular ester A compound (A2) and a silicone-based modifier (A3) are mixed to prepare a so-called polyol premix in advance, and then the organic polyisocyanate (a1) is charged and then the polyol premix is further charged to react (that is, The method of obtaining the isocyanate group-terminated prepolymer (A1)) is to solve the compatibility problem between the components as described above, facilitate the preparation work by reducing the viscosity of the polyol premix itself, Isocyanate group-terminated prepolymer (A1) and room temperature liquid low molecular weight ester compound (A2) From the viewpoint of avoidance of turbidity generated in the case where contact formulation, preferably. Under the present circumstances, 20-120 degreeC is preferable and, as for the reaction temperature in reaction (urethanation reaction) of organic polyisocyanate (a1) and the above-mentioned polyol premix, 40-100 degreeC is especially preferable. In the reaction, a conventionally known urethanization catalyst such as an organic metal compound such as dibutyltin dilaurate or dioctyltin dilaurate, an organic amine such as triethylenediamine or triethylamine, or a salt thereof can be used as necessary. In addition, other additives may be used as necessary. There is no particular limitation on the timing of charging the additive.

  In addition, when obtaining the organic polyisocyanate composition (A) in this invention, it is preferable that the preparation ratio (mass ratio) of a raw material is as follows.

  The isocyanate group content of the organic polyisocyanate composition (A) in the present invention is preferably 24 to 33% by mass, and particularly preferably 25 to 32.8% by mass. Moreover, it is preferable that the viscosity in 25 degreeC is 30-1,000 mPa * s, and it is especially preferable that it is 50-800 mPa * s.

  In the present invention, a polysiloxane-polyether copolymer containing no active hydrogen group (hereinafter abbreviated as “silicone-based additive”) can be added to the organic polyisocyanate composition (A). The basic skeleton of the silicone-based additive is the same as that of the silicone-based modifier (A3), and the only difference is that active hydrogen groups are not present in the polysiloxane and polyether structures. Includes foam stabilizers.

  The polyol (B) in the present invention comprises 50% by mass or more of the phthalic acid-based polyester polyol (b1) and less than 50% by mass of the polyol (b2) other than the phthalic acid-based polyester polyol.

  As the phthalic acid-based polyester polyol (b1), phthalic acid such as orthophthalic acid, isophthalic acid, terephthalic acid, and phthalic anhydride and one or more compounds having at least two hydroxyl groups are used. Can be produced by a known method. In addition, a phthalic acid-based recovered polyester polyol obtained by decomposing a phthalic acid-based polyester molded product such as polyethylene terephthalate can also be suitably used as the phthalic acid-based polyester polyol (b1). Since the phthalic polyester polyol (b1) used in the present invention has an aromatic ring, it is advantageous in flame retardancy and is relatively inexpensive.

  Examples of the compound having at least two hydroxyl groups include ethylene glycol, diethylene glycol, triethylene glycol, 1,2-propylene glycol having two or more hydroxyl groups in one molecule (that is, having two functional groups), Glycols such as 1,3-butanediol, tetramethylene glycol, hexamethylene glycol, decamethylene glycol, glycerin having 3 functional groups, trimethylolpropane, pentaerythritol having 4 functional groups, having 5 functional groups Examples include sorbitol.

  In the present invention, the viscosity of the polyester obtained with an increase in the number of functional groups increases, and from the viewpoint that defects such as not filling up to the end portion in the manufacturing process of the outer wall material, for example, the hydroxyl group is likely to occur. It is preferable that the number of functional groups in the compound (that is, the nominal number of functional groups in the phthalic acid-based polyester polyol (b1) in the present invention) is 2 to 3.

  In addition, the preferable hydroxyl value of a phthalic acid-type polyester polyol (b1) is 100-800 mgKOH / g, More preferably, it is 150-500 mgKOH / g, Most preferably, it is 150-300 mgKOH / g.

  As described above, the polyol (B) in the present invention comprises 50% by mass or more of the phthalic polyester polyol (b1) and less than 50% by mass of the polyol (b2) other than the phthalic polyester polyol. Therefore, for the purpose of improving the dimensional stability in the obtained water-foamed rigid polyisocyanurate foam, a polyol (b2) other than the phthalic polyester polyol (hereinafter referred to as “other polyol (b2)”), if necessary. (Abbreviation) is less than 50% by mass with respect to the entire polyol (B) (preferably less than 40% by mass from the viewpoint of ensuring the flame retardancy and mechanical properties desired for the resulting water-foamed rigid polyisocyanurate foam, Particularly preferably, it can be used in the range of less than 30% by mass.

  Examples of the other polyol (b2) include polyester polyols and polyether polyols other than the above-mentioned phthalic acid-based polyester polyol (b1).

  Examples of the polyester polyol other than the phthalic polyester polyol (b1) include one or two or more compounds having at least two carboxyl groups other than phthalic acid, and one or two or more hydroxyl groups. It can manufacture by a well-known method using the compound which has group. Examples of the compound having at least two carboxyl groups other than phthalic acid include saturated hydrocarbon dibasic acids such as oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, and pimelic acid, maleic acid, and glutacone. Examples thereof include unsaturated hydrocarbon dibasic acids such as acids. Moreover, not only a dibasic acid but tribasic acids, such as trimellitic acid and hemimellitic acid, are also mentioned. Examples of the compound having at least two or more hydroxyl groups include compounds having at least two or more hydroxyl groups listed as those used for obtaining the above-mentioned phthalic acid-based polyester polyol (b1).

  The polyether polyol preferably has a nominal number of functional groups of 2 to 6 and a hydroxyl value of 20 to 1,000 mgKOH / g. For example, ethylene glycol, 1,3-propylene glycol, 1,2-propylene glycol, 1,4-butanediol 1,3-butanediol, 1,2-butanediol, 1,5-pentanediol, 1,7-heptanediol, glycerin, trimethylolpropane, trimethylolethane, hexane 1,2,6-triol, pentaerythritol Stall, sorbitol, sucrose, glucose, fructose, aliphatic or aromatic polyhydric alcohols such as bisphenol A, alkanolamines such as monoethanolamine, diethanolamine, triethanolamine, ethylenediamine, propylenediamine, and ethylene One or more compounds having two or more active hydrogen atoms such as aliphatic amines such as triamine, aromatic amines such as toluenediamine, metaphenylenediamine, diphenylmethanediamine, and xylenediamine are used as an initiator. Produced by addition polymerization of one or more monomers such as alkylene oxide such as ethylene oxide, propylene oxide, butylene oxide, glycidyl ether such as methyl glycidyl ether and phenyl glycidyl ether, and styrene oxide by a known method. Is mentioned.

  When the catalyst (C) in the present invention obtains the water-foamed rigid polyisocyanurate foam in the present invention, more of the isocyanate groups present in the forming composition contribute to the formation of the isocyanurate ring structure (ie, trimerization). It contains an isocyanurate-forming catalyst (c1) for the purpose of promoting reaction.

  Examples of the isocyanuration catalyst (also referred to as “trimerization catalyst”) (c1) used in the present invention include isocyanuration catalysts conventionally known in the art such as 2,4,6-tris (dimethylamino). Amine compounds such as methyl) phenol, 2,4-bis (dimethylaminomethyl) phenol, 2,4,6-tris (dialkylaminoalkyl) hexahydro-S-triazine, potassium acetate, potassium 2-ethylhexanoate, octylic acid Examples thereof include alkali metal salts of carboxylic acids having 2 to 12 carbon atoms such as potassium and quaternary ammonium salts of carboxylic acids. Also, commercially available products called isocyanuration catalysts, such as “DABCO P15 (manufactured by Sankyo Air Products Co., Ltd.)”, “DABCO K15 (manufactured by Sankyo Air Products Co., Ltd.)”, “PELCCAT 9540 (manufactured by Perlon)”, “DABCO TMR (manufactured by Sankyo Air Products Co., Ltd.)”, “TOYOCAT TR20 (manufactured by Tosoh Corporation)”, “U-CAT 18X” and the like.

  Moreover, when obtaining the water foaming rigid polyisocyanurate foam in this invention, reaction with an isocyanate group and an active hydrogen group is also accelerated | stimulated, and it uses together with the isocyanuration catalyst (c1) from the objective of obtaining a suitable reaction balance. Thus, a urethanization catalyst known in the art can be used in combination. Examples of the urethanization catalyst include triethylamine, tripropylamine, tributylamine, N-methylmorpholine, N-ethylmorpholine, dimethylbenzylamine, N, N, N ′, N′-tetramethylhexamethylenediamine, N, N, N ′, N ′, N ″ -pentamethyldiethylenetriamine, bis- (2-dimethylaminoethyl) ether, triethylenediamine, tertiary amine such as 1,8-diaza-bicyclo (5,4,0) undecene-7, dimethyl Reactive tertiary amines such as ethanolamine, N-trioxyethylene-N, N-dimethylamine, N, N-dimethyl-N-hexanolamine or their organic acid salts, 1-methylimidazole, 2-methylimidazole, 1,2-dimethylimidazole, 2,4-dimethylimidazole, 1- Examples include imidazole compounds such as til-2-methylimidazole, organometallic compounds such as stannous octoate, dibutyltin dilaurate, zinc naphthenate, etc. Commercial products called urethanization catalysts such as “KAOLYZER No. 21” (Manufactured by Kao Corporation), "DABCO XDM (manufactured by Sankyo Air Products Co., Ltd.)", "TOYOCAT DT (manufactured by Tosoh Corporation)", "TOYOCAT ET (manufactured by Tosoh Corporation)", "TOYOCAT RX3 (Tosoh Corporation) "," TOYOCAT RX5 (Tosoh Corporation) "," TOYOCAT DM70 (Tosoh Corporation) "," TOYOCAT F94 (Tosoh Corporation) "," FOMREZ UL-28 (Manufactured by Witco) ".

  The foaming agent (D) used in the present invention uses water alone. Foaming is performed with carbon dioxide generated by the reaction between an isocyanate group and water. It is preferable that the usage-amount of water is 0.1-10 mass% with respect to this polyisocyanurate foam raw material. When the amount of water used is less than 0.1% by mass, the generated carbon dioxide gas is reduced, and the density of the resulting polyisocyanurate foam is undesirably increased. On the other hand, if the amount of water used exceeds 10% by mass, urea bonds are excessively formed, the foam tends to be hard and brittle, and the adhesion to the face material, dimensional stability, and the like are deteriorated.

  In addition, in order to assist the rise of the liquid at the early stage of foaming and / or to promote a reduction in density, a known foaming agent usually used for urethane foaming may be used as a foaming auxiliary agent in addition to water.

  The foam stabilizer (E) used in the present invention is an organosilicon surfactant known in the art, such as L-520, L-540, L-5309, L-5366, manufactured by Nippon Unicar Co., Ltd. SZ-1306, L-5340, SZ-1642, SH-190, SH-192, SH-193, SH-194, SRX-274C, SF-2962, SF-2964, SF manufactured by Toray Dow Corning Silicone Co., Ltd. -2935F, SF-2936F, Goldschmidt B-4113, B-8444, B-8455, B-8466, B-8680, B-8870, Air Products DC-2583, DC-5043, DC- 5169, X-20-1384, X-20-1784, X-20-1747, X-20-1748, F manufactured by Shin-Etsu Chemical Co., Ltd. 348, F-385, F-305M and the like. The amount of the foam stabilizer used is 0.01 to 5% by mass relative to the polyisocyanurate foam raw material.

  Examples of the flame retardant (F) used in the present invention include triethyl phosphate, tributyl phosphate, trischloroethyl phosphate, trischloropropyl phosphate (abbreviation TCPP), triphenyl phosphate, tricresyl phosphate, polyphosphate, and the like. And phosphoric acid compounds such as phosphites and chlorinated paraffins. The amount of the flame retardant used is 0.1 to 30% by mass with respect to the polyisocyanurate foam raw material.

  The tetraalkoxysilane (G) used in the present invention may be composed of one or more alkoxyl groups. This tetraalkoxysilane (G) is represented by the following general formula (10).

  A preferred alkoxyl group has 1 to 4 carbon atoms, and among them, from the viewpoint that both the density reduction of the obtained water-foamed hard polyisocyanurate foam and the desired flame retardancy can be obtained. It is preferable to select and use an ethoxy group having 2 carbon atoms (that is, tetraethoxysilane). This tetraethoxysilane is easily available, for example, as “Ethyl silicate 28P (trade name: manufactured by Colcoat Co., Ltd.)” manufactured by Colcoat.

  Note that tetraalkoxysilane oligomers are not preferable because they may cause precipitation.

The amount of tetraalkoxysilane (G) introduced is preferably in the range of 0.5 to 5 parts by mass with respect to 100 parts by mass of the organic polyisocyanate composition (A) of the present invention. (A) It is especially preferable that it is the range of 0.8-3.5 mass part with respect to 100 mass parts. When the amount is less than 0.5 parts by mass, the effect of improving the flame retardancy desired in the present invention cannot be obtained, and the effect of reducing the density of the obtained water-foamed rigid polyisocyanurate foam can also be obtained. Can not. On the other hand, the introduction amount exceeding 5 parts by mass is not preferable because the cause is unknown, but the result is that the flame retardancy is worsened.

  In the present invention, in addition to the above (A) to (G), as necessary, as an additive, a foam breaker, an antioxidant, an ultraviolet absorber, a plasticizer, a pigment / dye, an antibacterial agent / antifungal agent Various known additives such as can be added.

  Next, the manufacturing method of the water foaming rigid polyisocyanurate foam of this invention is described.

  When the water-foamed rigid polyisocyanurate foam of the present invention is produced, the equivalent ratio of all isocyanate groups to all active hydrogen groups in the forming composition of the present invention, that is, the isocyanate index which is a value obtained by multiplying the equivalent ratio by 100 Is in the range of 150 to 800, preferably in the range of 160 to 500, particularly preferably in the range of 220 to 460. Here, the active hydrogen group means an isocyanate-reactive group, which includes a hydroxyl group, an amino group, a carboxylic acid group, etc., and water is a compound having an active hydrogen group. When this equivalent ratio is excessive, the hardness and flame retardancy of the water-foamed rigid polyisocyanurate foam obtained are improved, but the foam itself becomes brittle and the possibility of deterioration of the adhesion to the face material increases.

  In addition, the water foaming rigid polyisocyanate foam manufactured in this range contains a urethane bond. The water-foamed rigid polyisocyanurate foam of the present invention is a foam having both a urethane bond and an isocyanurate structure, and the isocyanurate structure increases as the equivalent ratio increases.

  The production of the water-foamed rigid polyisocyanurate foam may be a multi-component system of three or more components, but for the purpose of simplifying the apparatus, the “I liquid component” comprising the organic polyisocyanate composition (A) as the main component A two-component system composed of an “R liquid component” mainly composed of polyol (B) is preferable.

  When a water-foamed hard polyisocyanurate foam is produced by a two-component system composed of the “I liquid component” and the “R liquid component”, the “I liquid component” includes an organic polyisocyanate composition (A) and a tetraalkoxy. Consists of silane (G), while “R component” is composed of polyol (B), catalyst (C), water (D) as foaming agent, foam stabilizer (E), and flame retardant (F). The “I liquid component” and the “R liquid component” are preferably uniformly mixed using an apparatus described later to obtain the water-foamed hard polyisocyanate foam-forming composition of the present invention.

  Here, in the production of the water-foamed hard polyisocyanurate foam, when the water-foamed hard polyisocyanurate foam is produced by the two-component system composed of the “I liquid component” and the “R liquid component”, a tetraalkoxysilane (G ) Must be an “I liquid component” in order to avoid hydrolysis with water (D) as a blowing agent.

  In addition, other components which do not react with an isocyanate group, for example, a foam stabilizer (E) and a flame retardant (F) can be added to "I liquid component". In this case, the “R liquid component” may not contain the foam stabilizer (E) or the flame retardant (F), and the foam stabilizer (E) or the flame retardant (F) may be designated as “I liquid component” and “ It may be added separately to both of “R liquid component”.

  As a specific apparatus for producing the water-foamed rigid polyisocyanurate foam, any apparatus can be used as long as it can be uniformly mixed. For example, small mixers, low pressure or high pressure foaming machines for injection foaming, low pressure or high pressure foaming machines for slab foaming, low pressure or high pressure foaming machines for continuous lines, etc. can do.

  Next, the water foamed rigid polyisocyanurate foam of the present invention will be described.

Water-blown rigid polyisocyanurate foams of the present invention, the foam when tested by a cone calorimeter conforming to ISO5660 alone, the total amount of heat generated heat intensity 50kW / ^m 15MJ / ^{m 2} by ² at 10 minutes In addition, the maximum heat generation rate during the 10 minutes is 200 kW / m ² or less.

  The water-foamed rigid polyisocyanurate foam of the present invention is also obtained by performing a test with a cone calorimeter in accordance with ISO 5660, which is integrally molded with a color steel plate as a face material. A rating of incombustible or semi-incombustible can be obtained.

  EXAMPLES Hereinafter, although an Example demonstrates this invention in more detail, this invention is limited to these and is not interpreted. In the examples and comparative examples, “parts” and “%” indicate “parts by mass” and “mass%”, respectively, unless otherwise specified.

[Synthesis of organic polyisocyanate composition]
Synthesis example 1
A container equipped with a 5 kg stirrer is charged with 1.0 kg of PP-400, 3.0 kg of PC, 1.0 kg of ether (1), and 1.0 kg of silicone (1), and stirred and mixed at room temperature. A polyol premix was prepared. On the other hand, 97 kg of p-MDI was charged into a reactor having a capacity of 100 kg equipped with a stirrer, a cooling pipe, a nitrogen introduction pipe, and a thermometer, and heated to 40 ° C. while stirring. Next, 3 kg of the polyol premix was charged, and the temperature was raised to 60 ° C. while stirring, followed by reaction for 2 hours to obtain “NCO-1” as an organic polyisocyanate composition. The isocyanate group content (hereinafter abbreviated as “NCO group content”) in “NCO-1” was 29.9%. In the present invention, “NCO-1” is a comparative example in which no tetraalkoxysilane is introduced.

Synthesis example 2
In a container equipped with a 5 kg stirrer, as in Synthesis Example 1, 1.0 kg of PP-400, 3.0 kg of PC, 1.0 kg of ether (1), and 1.0 kg of silicone (1) were charged. A polyol premix was prepared by stirring and mixing at room temperature. On the other hand, 97 kg of p-MDI was charged into a reactor having a capacity of 100 kg equipped with a stirrer, a cooling pipe, a nitrogen introduction pipe, and a thermometer, and heated to 40 ° C. while stirring, as in Synthesis Example 1. Subsequently, 3 kg of the polyol premix was charged in the same manner as in Synthesis Example 1, and the mixture was heated to 60 ° C. with stirring and reacted for 2 hours to obtain an organic polyisocyanate composition (“NCO-1”). Furthermore, 100 parts by mass of the obtained “NCO-1” and 0.3 parts by mass of tetraethoxysilane were uniformly mixed, and “NCO-2” which is a mixture of an organic polyisocyanate composition and tetraalkoxysilane was added. Obtained. The isocyanate group content in “NCO-2” (hereinafter abbreviated as “NCO group content”) was 29.8%.

Synthesis Examples 3-5
In the same manner as in Synthesis Example 1, after preparing a polyol premix by mixing raw materials other than p-MDI in advance, an organic polyisocyanate composition was obtained based on the raw materials and preparation ratios shown in Table 1, The organic polyisocyanate composition and the tetraalkoxysilane are uniformly mixed based on the raw materials and the charging ratio shown in FIG. 1, and “NCO-3” to “NCO-5”, which are mixtures of the organic polyisocyanate composition and the tetraalkoxysilane. Got. These NCO group contents are shown in Table 1.

The obtained organic polyisocyanate compositions “NCO-1” to “NCO-5” were allowed to stand in an atmosphere at 20 ° C. for 24 hours after synthesis, and then visually observed (phase separation / turbidity / crystal of liquid) Presence or absence).
○: Liquid phase separation, turbidity, and crystal are all good. X: Liquid phase separation, turbidity, or crystal is generated. Table 1 shows the evaluation results.

Synthesis Examples 1 to 5, Notes in Table 1 p-MDI: Polymeric MDI (corresponding to (a1) of the present invention)
Organic polyisocyanate containing MDI (a1x) and MDI-based multinuclear condensate (a1y)
MDI peak area ratio = 40%
* MDI peak area ratio was calculated from GPC.
4,4′-MDI content in MDI = 99%
* The 4,4′-MDI content in MDI was calculated from GC.
NCO group content = 31.0%
Acidity = 0.015%
PP-400: Poly (oxypropylene) polyol (corresponding to (a2) of the present invention)
Nominal functional group = 2
Number average molecular weight = 400
Ether (1): Polyether monool (corresponding to (a3) of the present invention)
Initiator = 2-ethylhexanol
Number average molecular weight = 800
PO / EO = 90/10 (mass ratio)
PC: Propylene carbonate (corresponding to (A2) of the present invention)
ε-CL: ε-caprolactone (corresponding to (A2) of the present invention)
Silicone (1): hydroxyl group-containing polydimethylsiloxane-polyether copolymer of the chemical structural formula (1) type (corresponding to (A3) of the present invention)
Number average molecular weight = 6,000
Hydroxyl value = 9.3 mgKOH / g
Average functional group = 1
Tetraethoxysilane: (corresponding to (G) of the present invention)
Product name "Ethyl silicate 28P", manufactured by Colcoat Co., Ltd.

[Preparation of polyol premix for forming water-foamed rigid polyisocyanurate foam]
Formulation Example 1
Based on the raw materials and preparation ratios shown in Table 2, a polyol premix “OH-1” for forming a water-foamed hard polyisocyanurate foam was prepared.

Note Polyol (1) in Table 2: Phthalic acid-based recovered polyester polyol (corresponding to (b1) of the present invention)
Product name "TEROL-280", manufactured by OXID
Nominal functional group = 2
Hydroxyl value = 110 mg KOH / g
Polyol (2): Mannich polyether polyol
Product name "DK polyol 3776", manufactured by Daiichi Kogyo Seiyaku Co., Ltd.
Nominal functional group = 3
Hydroxyl value = 350 mgKOH / g
Catalyst (1): Potassium octylate (corresponding to (c1) of the present invention)
Product name “DABCO K15”, Sankyo Air Products Co., Ltd. Catalyst (2): Amine-based urethane catalyst
Trade name “TOYOCAT DT”, Tosoh Corporation SF-2936F: silicone foam stabilizer
Trade name "SF-2936F", Toray Dow Corning Silicone Co., Ltd. TCPP: Organophosphorous flame retardant
Tris-β-chloropropyl phosphate
Product name "Philol PCF", Akzo Nobel

[Preparation of water-foaming rigid polyisocyanurate foam-forming composition and production of water-foaming rigid polyisocyanurate foam]
Example 1:
The above-mentioned polyol premix “OH-1” for forming a water-foamed rigid polyisocyanurate foam and the above-mentioned organic polyisocyanate composition “NCO-2” were each adjusted to a temperature of 20 ° C. Then, “NCO-2” / “OH-1” = 4.55 (mass ratio), weighed into a 2000 ml death cup so that the total weight becomes 500 g, and stirred for 4 seconds with a disk-type Pella mixer (rotation speed: 7000 rpm). Thus, a water-foamed hard polyisocyanurate foam-forming composition was obtained.
The composition was poured into an open top aluminum mold having an inner dimension of 250 × 250 × 250 (height) mm, which had been temperature-controlled at 40 ° C., immediately after stirring, and the reaction rate of the free foaming foam (cream time ( Hereinafter, abbreviated as “CT”) and rise time (hereinafter abbreviated as “RT”)) were measured.
Immediately after removing the foam obtained after 10 minutes from the start of stirring, the free rise density (hereinafter abbreviated as “FRD”) was measured according to JIS A9511. At that time, the cell state of the foam was visually evaluated.
○: The cell is uniform and fine and good. X: The cell is rough. The evaluation results are shown in Table 3.

Examples 2-6, Comparative Examples 1-3:
By the same method as Example 1, according to the combination and mass ratio shown in Table 3, the composition for water-foaming rigid polyisocyanurate foam formation was obtained.
About each composition, the reaction rate (CT and RT) of the free foaming foam was measured by the same method as Example 1, FRD was measured by the same method as Example 1, and the cell state of foam was evaluated simultaneously.
The evaluation results are shown in Table 3.

  As shown in Table 3, for example, when Examples 2 to 4 and Comparative Examples 1 to 3 are compared, it can be seen that the FRD in Examples 2 to 4 has a lower density than the FRD in Comparative Examples 1 to 3. .

[Evaluation of adhesion between water-foamed rigid polyisocyanurate foam and colored steel sheet]
About the composition obtained by the combination and mass ratio as described in the Example shown in Table 3, and a comparative example, after obtaining a composition by the method similar to the time of measurement of the reaction rate etc. of a free foaming foam separately, it is 60 degreeC beforehand. Inside size 500 that is temperature-controlled and has a color steel plate (trade name “Month Star GL Color (CGLCCC: EF45112)”, thickness 0.27 mm, manufactured by Nisshin Steel Co., Ltd.) inside the upper lid. X250 × 25 (height) mm top cover and 250 mm free on both sides. Immediately after pouring, the cap is closed immediately after the pouring and the water-foamed rigid polyisocyanurate foam is bonded to the color steel plate. Was molded.
The molded product obtained after 5 minutes from the start of stirring was demolded, and the adhesion to the color steel plate was evaluated by a method of peeling off the color steel plate immediately.
○: Adhesive strength is strong and force is required for peeling ×: Adhesive strength is weak and no force is required for peeling Table 3 shows the evaluation results.

[Evaluation of flammability of water-foamed rigid polyisocyanurate foam]
About the composition obtained by the combination and mass ratio as described in the Example and comparative example shown in Table 3, after obtaining a composition by the method similar to the time of measurement of the reaction rate etc. of a free foaming foam separately, it is 40 degreeC beforehand. Immediately after the completion of stirring, the mixture was poured into a temperature-controlled inner mold with an open top surface of 250 × 250 × 250 (height) mm.
After 10 minutes from the start of stirring, the obtained foam was removed and allowed to stand in an atmosphere of 20 ° C. for 48 hours.
After standing, a foam sample was cut out so as to be 100 mm × 100 mm × 25 mm (thickness). This was subjected to a quasi-incombustibility test (a 10-minute exothermic test with a heating intensity of 50 kW / m ² ) using a cone calorimeter based on ISO 5660 to evaluate the combustion performance.
The evaluation results are shown in Table 3.

  As shown in Table 3, for example, when Examples 2 to 4 and Comparative Examples 1 to 3 are compared, the total calorific value and the maximum heat generation rate in Examples 2 to 4 are the total calorific value and the maximum calorific value in Comparative Examples 1 to 3, respectively. It can be seen that the result is better than the heat generation rate.

Application Example About the composition obtained by the combination and mass ratio in Example 2 shown in Table 3, after obtaining a composition by the method similar to the time of measuring the reaction rate etc. of a free foaming foam separately, it is 60 degreeC beforehand. The temperature was controlled, and colored steel plates (trade name “Moonsei GL Color (CGLCC: EF45112)”, thickness 0.27 mm, manufactured by Nisshin Steel Co., Ltd.) were mounted on the inside and bottom surface of the top cover in advance. Injected into an aluminum mold with a top cover of 500 x 250 x 25 (height) mm and free of both sides on the 250mm side, immediately after stirring, and closed immediately after the pouring, water foamed rigid polyisocyanurate foam and color Sandwich compacts were formed from steel plates.
After 10 minutes from the start of stirring, the obtained molded product was removed from the mold and allowed to stand for 48 hours in an atmosphere at 20 ° C.
After standing, the molded body was cut out so as to be 100 mm × 100 mm × 25 mm (thickness). This was subjected to a non-flammability test (a 20-minute exothermic test with a heating intensity of 50 kW / m ² ) using a cone calorimeter based on ISO 5660, and the combustion performance was evaluated.
Total calorific value: 7.2 MJ / m ²
Maximum heat generation rate: 38 kW / m ²
No cracks or holes: None

The water-foamed rigid polyisocyanurate foam obtainable by the present invention is used in applications where flame retardance is particularly required in each field using conventional rigid polyisocyanurate foam or rigid polyurethane foam, such as outer wall materials, boards, panels, It can be applied to applications requiring flame retardancy among various heat insulating applications such as firewood, doors, shutters, sashes, siding, concrete houses, bathtubs, pipe covers, slabs and the like.

Claims (3)

Organic polyisocyanate composition (A),
Polyol (B),
A catalyst (C) containing an isocyanurate-forming catalyst (c1),
Water (D) as blowing agent,
Foam stabilizer (E),
Flame retardant (F), and tetraalkoxysilane (G)
A water-foaming rigid polyisocyanurate foam-forming composition comprising:
The organic polyisocyanate composition (A) is added to an organic polyisocyanate (a1) containing diphenylmethane diisocyanate (a1x) and a diphenylmethane diisocyanate polynuclear condensate (a1y), and a poly (oxypropylene) polyol having a number average molecular weight of 600 or less (a2 ), And an isocyanate group-terminated prepolymer (A1) obtained by reacting a polyether monool (a3) having an oxyethylene group content of 20% by mass or less in a repeating unit comprising an oxyalkylene group, a room temperature liquid low molecular ester system Compound (A2), and polydimethylsiloxane-polyether copolymer (A3) which may be reacted with (a1),
The water-foamed hard polyisocyanate characterized in that the polyol (B) comprises 50% by mass or more of the phthalic polyester polyol (b1) and less than 50% by mass of the polyol (b2) other than the phthalic polyester polyol A composition for forming a nurate foam.   A method for producing a water-foamed rigid polyisocyanurate foam, comprising using the composition according to claim 1. The total calorific value in the test using a corn calorimeter according to ISO 5660 obtained by the production method according to claim 2 is 15 MJ / m ² or less in 10 minutes at a heating intensity of 50 kW / m ² , and the 10 A water-foamed rigid polyisocyanurate foam having a maximum heat generation rate per minute of 200 kW / m ² or less.