JP2003277463A - Polyol composition for rigid polyurethane foam and method for producing polyurethane foam - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a polyol composition for a rigid polyurethane foam which has practical productivity and low thermal conductivity and whose primary shrinkage in its production is at least equivalent to those of conventional rigid polyurethane foams, and to provide a method for producing the rigid polyurethane foam. <P>SOLUTION: The polyol composition comprises polyol compounds, a foaming agent, a foam stabilizer and a catalyst. In this composition, the polyol compounds are 2-4 in the total average number of functional groups, and 100 pts.wt. of the polyol compounds comprises 25-50 pts.wt. of an aromatic amine- based polyether polyol, 10-30 pts.wt. of a trimethylolalkane-based polyether polyol, 10-30 pts.wt. of an ethylenediamine-based polyether polyol and 10-30 pts.wt. of an aromatic polyester polyol. The foaming agent contains at least one of an organic foaming agent such as HCFC-141b. The method for producing the rigid polyurethane, foam involves using this polyol composition and an isocyanate. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a polyol composition for a rigid polyurethane foam having a low thermal conductivity and a method for producing a rigid polyurethane foam having a low thermal conductivity.

[0002]

2. Description of the Related Art Rigid polyurethane foam is well known as a material having a high heat insulating property and is widely used as a heat insulating material for buildings. As a rigid polyurethane foam which is such a heat insulating material, a sandwich panel having face materials on both sides is generally used.

Such sandwich panels are mainly manufactured by a continuous manufacturing method. In the continuous production method, usually, the lower surface material is continuously supplied, and the foaming stock solution composition obtained by mixing the polyol composition and the polyisocyanate component is sprayed to a predetermined thickness to supply the foaming stock solution composition. A sandwich panel is manufactured by supplying an upper surface material onto an object, foaming and curing it under heating, and also adhering it to the surface material. In the foaming process, a double conveyor that compresses both sides of the panel is used to obtain thickness accuracy.

In the production of the above-mentioned rigid polyurethane foam panel, the foamed and cured polyurethane foam undergoes shrinkage (primary shrinkage) by being naturally cooled after being discharged from the heating device. If the primary shrinkage is large, the dimensions of the panel, which is the manufactured heat insulating material, will not be stable, and the heat insulating material having the standard dimensions cannot be manufactured stably,
It causes a very serious problem in practical production. In order to suppress such a primary shrinkage, a shoe cloth type polyol having a high number of functional groups has been conventionally used as a component of a polyol composition.

In the case of using the above-mentioned rigid polyurethane foam as a heat insulating material, conventionally, an internal heat insulating construction method in which it is installed between columns has been widely adopted. However, due to the high thermal conductivity of the columns, there was a limit to reducing the thermal conductivity of the roof, floor, walls, etc. by the internal insulation method.

In recent years, there has been a demand for a building having a higher heat insulating property in order to improve energy efficiency. As a construction method for realizing such a highly insulated building, an outer insulation method is being put to practical use in buildings such as houses. The external heat insulation method is a method of disposing a heat insulating material on the outside of the pillar, and since the pillar is covered with the heat insulating material, a building exhibiting excellent heat insulating properties is formed.

[0007]

However, in the conventional rigid polyurethane foam using the sucrose-based polyol, it is necessary to increase the ratio of the sucrose-based polyether polyol in order to suppress the primary shrinkage. Thermal conductivity is 0.021W /
It cannot be lowered to about mK or more, and the thermal conductivity is less than 0.
020 W / m · K or less, further 0.017 W / m · K
Attempting to set the degree to a certain degree could not suppress the primary contraction and was in a state of antinomy.

Since the number of defective products increases in the production when the primary shrinkage occurs, it is necessary to use a formulation having a high ratio of sucrose-based polyether polyol. Therefore, when it is used as a heat insulating material used in the outer heat insulating method, it is necessary to increase the thickness in order to obtain a predetermined heat insulating performance. That is, in the construction of wooden houses, as a standard to receive premium loans for next-generation energy-saving houses,
When a conventional rigid polyurethane foam having a thermal conductivity of 0.028 W / m · K or less is used, the thickness of the heat insulating layer described in (Table 1) below is required.

[0009]

[Table 1] Region I is a cold region such as Hokkaido.

However, when a wooden house is constructed by providing a heat insulating layer according to this standard, the following problems occur. (B) According to the above criteria, the addition of columns and insulation layers will result in a substantial wall thickness. However, in Japan, the land price is high, and a certain distance is required between the building and the land boundary.
Although it is required that the wall thickness be as small as cm or 2 cm, it is not possible to meet such a request.

(B) In a wooden house, the heat insulating material for external heat insulation is fixed to the pillar with nails. So-called 5 inch nails, that is, nails with a total length of 16.5 cm, are the largest of these nails, and considering the moment loaded by vibration such as an earthquake, the nails are the fastening members, that is, the thickness of the panel for external heat insulation. 3 times or more of the length is required. However, when trying to use a panel with the required heat insulation material thickness (Table 1), it is necessary to fix it with bolts, or even if the bolts are not fixed, the space between the nails must be narrowed, and the strength against nails is still high. There is a problem that the burden becomes large.

An object of the present invention is to use a rigid polyurethane foam having practical productivity and low thermal conductivity, that is, high heat insulation, and having a primary shrinkage during production which is equal to or higher than that of a conventional rigid polyurethane foam. To provide a method for producing a polyol composition and a rigid polyurethane foam.

[0013]

The present invention provides a polyol composition for rigid polyurethane foam, which is mixed with an isocyanate component containing a polyisocyanate compound as a main component to foam and cure to form a rigid polyurethane foam. A compound, a foaming agent, a foam stabilizer, and a catalyst, and the polyol compound has a total average number of functional groups of 2 to 4.
And 100 parts by weight of the polyol compound is (1)
Average number of functional groups 2-4, hydroxyl value 400-600 mg KO
H / g aromatic amine polyether polyol 25-
50 parts by weight, (2) hydroxyl value 400 to 900 mg KOH
/ G trimethylolalkane-based polyether polyol 10 to 30 parts by weight, (3) hydroxyl value 400 to 900 m
gKOH / g ethylenediamine-based polyether polyol 10 to 30 parts by weight (4) Average number of functional groups 2 to 4, hydroxyl value 150 to 400 m
gKOH / g aromatic polyester polyol 10-3
0 parts by weight, the blowing agent is HCFC-141
b, an HFC compound, n-pentane, and at least one organic foaming agent selected from cyclopentane.

When the polyol composition having the above-mentioned constitution is used to react with an isocyanate component and foam-cured, it has a practical productivity and a low thermal conductivity of 0.02 W / mK or less, that is, a high heat insulating property. It is possible to obtain a rigid polyurethane foam having a primary shrinkage at the time of production that is equal to or higher than that of a conventional rigid polyurethane foam.

Conventionally, it was considered that the use of a polyfunctional polyol such as sucrose (octafunctional) was indispensable for preventing the primary shrinkage. However, the polyol compound in the polyol composition has a specific composition, Total average number of functional groups is 4
Even in the following, it was possible to obtain a polyol composition for a rigid polyurethane foam having a primary shrinkage as good as or better than that of a conventional rigid polyurethane foam. When the average number of functional groups of the entire polyol compound is f _T , 2 <f _T
It is more preferable that <4. The maximum number of functional groups of the polyol compound in the polyol composition is 4 or less,
It does not contain a polyol compound containing more than 4 sorbitol (6 functional) or sucrose (8 functional) as a base.

As the HFC compound which is an organic foaming agent,
HFC-134a, HFC-245fa, etc. are illustrated.

In the above polyol composition for rigid polyurethane foam, it is preferable that the foaming agent further contains water.

By using water as the foaming agent component, the effect of improving the adhesion performance between the foam and the face material, the effect of improving the surface performance of the foam and the like can be obtained.

The mixing ratio of water and the fluorine-containing organic blowing agent is
The water / organic foaming agent ratio is preferably 1/60 to 1/20 (weight ratio). The blending amount of the foaming agent is preferably 0.5 to 2.0 parts by weight of water and 30 to 40 parts by weight of the organic foaming agent with respect to 100 parts by weight of the polyol compound.

If the amount of water is too large, the thermal conductivity may be deteriorated, and if the amount is too small, the mechanical strength of the foam may be lowered.

It is a preferred embodiment that the above polyol composition for rigid polyurethane foam further contains 5 to 30 parts by weight of a phosphate ester flame retardant with respect to 100 parts by weight of the polyol compound.

By adding a flame retardant, it is possible to obtain a rigid polyurethane foam which satisfies the flame retardant standard required for a heat insulating material for buildings.

The present invention provides a bottom surface material supplying step of supplying a bottom surface material, a foaming stock solution supplying step of supplying a foaming stock solution composition obtained by mixing a polyol composition and an isocyanate component onto the bottom surface material, and the foaming stock solution composition. A method for producing a rigid polyurethane foam, comprising: an upper surface material supplying step of supplying an upper surface material onto the upper surface; and a foaming step of foaming and curing the foaming undiluted composition to form a sandwich panel, wherein the polyol composition is a polyol compound. , A foaming agent, a foam stabilizer, and a catalyst. The polyol compound has a total average number of functional groups of 2 to 4, and 100 parts by weight of the polyol compound is (1) an average number of functional groups of 2 to 4 and a hydroxyl value of 400. ~ 60
25-50 parts by weight of 0 mg KOH / g aromatic amine-based polyether polyol, (2) hydroxyl value 400-900
mgKOH / g trimethylolalkane-based polyether polyol 10 to 30 parts by weight, (3) hydroxyl value 400
~ 800 mg KOH / g ethylenediamine-based polyether polyol 10-30 parts by weight (4) Average number of functional groups 2-4, hydroxyl value 150-400 m
gKOH / g aromatic polyester polyol 10-3
0 parts by weight, the blowing agent is HCFC-141
b, an HFC compound, n-pentane, cyclopentane, and at least one organic foaming agent.

By the manufacturing method having such a structure, the thermal conductivity is as low as 0.02 W / mK or less and the heat insulating property is high, and the primary shrinkage during manufacturing is as good as or better than that of the conventional rigid polyurethane foam. A rigid polyurethane foam can be obtained.

In the above manufacturing method, it is preferable that the foaming agent in the polyol composition used further contains water.

It is a preferred embodiment that the polyol composition further contains 5 to 30 parts by weight of a phosphoric acid ester flame retardant with respect to 100 parts by weight of the polyol compound.

[0027]

BEST MODE FOR CARRYING OUT THE INVENTION Regarding the above-mentioned polyol compound, (1) the aromatic amine-based polyether polyol is
Average number of functional groups is 3-4, hydroxyl value is 400-500 mg
KOH / g is more preferable, and the compounding amount thereof is
It is more preferably 30 to 40 parts by weight in 100 parts by weight of the polyol compound.

The aromatic amine-based polyether polyol is a compound obtained by ring-opening addition polymerization of at least one of propylene oxide, ethylene oxide and styrene oxide with an aromatic diamine. Examples of the aromatic polyamine include diaminobenzene and diaminotoluene. , Diethyltoluenediamine, naphthalenediamine, 4,4′-diaminodiphenylmethane, etc. are exemplified, and if necessary, 1
One kind or two or more kinds are used. Polyols based on these aromatic diamines, unless a glycol or the like is used as a raw material compound for adding an epoxy compound,
It becomes tetrafunctional.

(2) The trimethylolalkane-based polyether polyol preferably has a functional group number of 3 to 3.5 and a hydroxyl value of 700 to 900 mgKOH / g, and the compounding amount thereof is based on 100 parts by weight of the polyol compound. ,
It is more preferably 15 to 25 parts by weight.

The trimethylolalkane-based polyether polyol is a compound obtained by ring-opening addition polymerization of at least one of propylene oxide, ethylene oxide and styrene oxide with trimethylolalkane represented by trimethylolethane or trimethylolpropane. . Unless a glycol is used together as a raw material compound, the number of functional groups of this polyether polyol is 3.

(3) The ethylenediamine type polyether polyol has an average number of functional groups of 3 to 4 and a hydroxyl value of 600.
To 800 mgKOH / g is more preferable, and the compounding amount thereof is 15 to 100 parts by weight of the polyol compound.
It is more preferably 25 parts by weight.

The ethylenediamine type polyether polyol is a compound obtained by ring-opening addition polymerization of ethylenediamine with at least one of propylene oxide, ethylene oxide and styrene oxide. The number of functional groups of this polyether polyol is 4.

The above-mentioned polyether polyols (1) to (3) are preferably polymers of propylene oxide or copolymers of propylene oxide and ethylene oxide, and in the case of copolymers of propylene oxide and ethylene oxide. It may be a random copolymer or a block copolymer. In the case of a block copolymer, it is preferable that the hydroxyl group terminal is composed of a polymer of ethylene oxide.

(4) The aromatic polyester polyol is
Average number of functional groups is 2-2.5, hydroxyl value is 200-300
It is preferably mgKOH / g, and its blending amount is
It is more preferably 15 to 25 parts by weight.

The aromatic polyester polyol is synthesized by a reaction of condensing an aromatic polycarboxylic acid and a polyhydric alcohol compound, or a transesterification reaction of an aromatic polycarboxylic acid ester and a polyhydric alcohol compound.

Examples of the above-mentioned aromatic polycarboxylic acid include phthalic acid, isophthalic acid, terephthalic acid, trimellitic acid, pyromellitic acid, naphthalene 1,4-dicarboxylic acid and the like. These aromatic polycarboxylic acids may be used alone or in combination of two or more. In addition to the aromatic polycarboxylic acid, a part of the aliphatic polycarboxylic acid can be used together.

As the polyhydric alcohol compound to be reacted with the aromatic polycarboxylic acid, a bifunctional or higher functional polyhydric alcohol compound generally used in the synthesis of polyurethane can be used. Examples of specific compounds As, ethylene glycol, propylene glycol, 1,
4-butanediol, 1,3-butanediol, 1,6
-Hexanediol, neopentyl glycol, 1,8
-Octanediol, 1,10-decanediol, diethylene glycol, polyethylene glycols having a molecular weight of up to about 1000 such as triethylene glycol and tetraethylene glycol, polypropylene glycols such as dipropylene glycol and tripropylene glycol, trimethylolpropane and glycerin And the like. These can be used alone or in combination of two or more. When a trifunctional or higher polycarboxylic acid and a polyhydric alcohol are not used, the number of functional groups of the aromatic polyester polyol is 2.

Aromatic polyester polyols are produced by dehydration condensation of these acids with polyhydric alcohols. It is also possible to carry out dealcoholization condensation using a lower alcohol ester such as methanol or ethanol of the above aromatic polycarboxylic acid, and an ester using an acid anhydride of the above aromatic polycarboxylic acid as a raw material. It is also possible to use a reaction for forming a bond in combination.

The aromatic polyester polyol can also be synthesized by using a transesterification reaction using the above-mentioned polyester compound containing the aromatic polycarboxylic acid as a raw material. Specifically, there can be exemplified a method in which polyester fiber or film containing polyethylene terephthalate as a main component is preferably crushed and mixed with the above-mentioned polyhydric alcohol compound to carry out a transesterification reaction.

In the production of aromatic polyester polyols, well-known esterification reaction-promoting catalysts such as basic compounds such as sodium alcoholate, metal-based catalysts such as alkyl titanates and organic tin compounds, p-toluenesulfonic acid and sulfuric acid. , A protonic acid catalyst such as hydrochloric acid, a Lewis acid catalyst such as aluminum chloride or boron trifluoride,
In addition, activated clay and acidic ion exchange resin can be used. It is preferable that both the acid value and the water content of the aromatic polyester polyol are low, and the acid value is 4 (mgKOH / g).
The following is preferable.

In addition to the above-mentioned polyol compound, other known polyol compounds for rigid polyurethane foam may be used in combination in order to adjust the properties without impairing the object of the present invention.

It is a preferred embodiment to use a commercially available product as the above-mentioned polyol compound.

In the rigid polyurethane foam stock solution of the present invention, other active hydrogen group-containing compounds may be used in addition to the above polyols. Water used as a foaming agent reacts with an isocyanate group to generate carbon dioxide gas, and also has a function as an active hydrogen group-containing compound. Examples of other active hydrogen group-containing compounds include glycols and low molecular weight aromatic diamines exemplified as the polyhydric alcohol compounds to be reacted with the aromatic polycarboxylic acid.

The isocyanate component to be foamed and cured by mixing with the polyol composition of the present invention contains a polyisocyanate compound as a main component. As such a polyisocyanate compound, a polyisocyanate compound for rigid polyurethane foam can be used without limitation. Specifically, 2,4-toluene diisocyanate, 2,6-toluene diisocyanate and mixtures thereof, 4,4 ′
-Diphenylmethane diisocyanate (MDI), crude MDI, etc. are exemplified. Among these, especially crude MD
The use of I is preferred.

Known compounds can be used as the phosphate ester flame retardant added to the rigid polyurethane foam of the present invention. As the phosphoric acid ester flame retardant, a halogenated alkyl ester of phosphoric acid, an alkyl phosphoric acid ester, an aryl phosphoric acid ester, a phosphonic acid ester, or the like can be used, and specifically, tris (β-chloroethyl) phosphate (TCEP). , Tris (β-
Examples thereof include chloropropyl) phosphate, tributylphosphate, triethylphosphate, cresylphenylphosphate, dimethylmethylphosphonate, and one or more of these can be used. Among these, especially tris (β-chloroethyl) phosphate (TC
EP), the use of tris (β-chloropropyl) phosphate is preferred.

The above flame retardant also has an effect as a viscosity reducing agent for lowering the viscosity of the polyol composition containing the polyester polyol.

As the catalyst used in the present invention, a tertiary amine catalyst which is a generally known polyurethane synthesis catalyst is used. Specifically, triethylenediamine,
N, N, N ', N'-tetramethylethylenediamine,
N, N, N ', N'-tetramethylhexamethylenediamine, pentamethyldiethylenetriamine (PMDET
A), hexamethyltiltriethylenetetramine (HM
TETA), bis (dimethylaminoethyl) ether (DMAEE) and the like are exemplified as suitable tertiary amine catalysts.

In the present invention, it is also a preferable embodiment to add a flame retardant, and a preferable flame retardant is as follows.
Examples include organic metal complexes, halogen-containing compounds, organic phosphates, antimony trioxide, aluminum hydroxide and other metal compounds.

Examples of the organometallic complex include metallocenes such as ferrocene and nickelocene, metal acetylacetonates such as iron acetylacetonate, 8-oxyquinoline metal complexes such as bis (8-oxyquinoline) copper, and bis (dimethylglycol). Examples of suitable compounds include dimethylglyoxime metal complexes such as oximo) copper, which may be used alone or in combination with 2
It is possible to use more than one species together.

However, with regard to these flame retardants, for example, if the organic phosphate ester is added excessively, the physical properties of the hard polyurethane foam obtained may be deteriorated, and the metal compound powder such as antimony trioxide is excessively added. Then, there may be a problem that the foaming behavior of the foam is affected, and the addition amount is limited to a range that does not cause such a problem.

In the polyol composition for rigid polyurethane foam of the present invention, colorants, antioxidants and the like well known to those skilled in the art can be used.

As the surface material of the rigid polyurethane foam of the present invention, known surface materials can be used without particular limitation.
Specific examples include paper, aluminum foil, steel plate, and the like. Particularly, the face material used for the outer wall surface is preferably a decorative face material such as a color steel plate or an inorganic material panel.

[0053]

[Production of rigid polyurethane foam]

<Raw materials used> The raw materials used for producing the rigid polyurethane foam are as follows. (1) Aromatic amine-based polyether polyol (aromatic amine-based PPG): 4 functional groups, hydroxyl value 465 mgK
OH / g (2) trimethylolpropane-based polyether polyol (TMP-based PPG): 3 functional groups, hydroxyl value 860 m
gKOH / g (3) Ethylenediamine-based polyether polyol (E
D-based PPG): 4 functional groups, hydroxyl value 760 mgKOH
/ G (4) Aromatic polyester polyol (phthalic acid type PE
S): Number of functional groups 2, hydroxyl value 260 mg KOH / g sucrose-based polyether polyol (SU-based PP
G): Number of functional groups 3.3, hydroxyl value 560 mg KOH / g The compounding ratio (expressed in parts by weight) is shown in Table 2.

[0054]

[Table 2] Further, the other components used and their compounding amounts (the amount of addition to the total 100 parts by weight of the polyol compound) are as follows. Catalyst: Kaolizer No. 1 (manufactured by Kao): 3.0 parts by weight Foaming agent HCFC-141b: 32 parts by weight Foaming agent Water: 1.0 parts by weight Flame-retardant plasticizer TCEP: 10 parts by weight Foam stabilizer SZ-1668 (manufactured by Nippon Unicar Co., Ltd.) ): 2 parts by weight As the isocyanate component, crude MDI (crude M
DI) 44V-20 (isocyanate concentration 31.5%,
Sumika Bayer Urethane) has an NCO / OH equivalent ratio of 1.
The composition was set to be 15.

<Evaluation> (Primary Shrinkage Amount) [Laboratory Evaluation] A polyol composition and an isocyanate component were mixed in a predetermined ratio, and 40 × 40 × 10 cm (thickness).
Pour into the mold, hold at 50 ° C for 10 minutes to foam and harden it into a plate-shaped rigid polyurethane foam, take it out from the mold and leave it at room temperature, and after 1 day, dent the thickness direction end face (mouth end) Was measured as the primary shrinkage amount.

[Evaluation of mass-produced prototypes] A double conveyor and a double conveyor for supplying a stock solution tank, a mixing head, and upper and lower surface materials of a rigid polyurethane foam and foaming a rigid polyurethane foam panel to a predetermined thickness are provided. It was manufactured in a continuous manufacturing line equipped with a heating oven for heating.

The rigid polyurethane foam is a polyol composition prepared by mixing the components except the isocyanate component.
The polyol composition and the isocyanate component are put in a stock solution tank, and the temperature is adjusted to 20 ° C. After supplying each component to a mixing head by a pump so as to have a predetermined mixing ratio, mixing and stirring to form a foaming stock solution composition, supplying it on a lower surface material, and further supplying an upper surface material to form a sandwich shape. It is sent to the double conveyor. Here, the sandwich panel is formed by foaming to a predetermined thickness by heating and pressing. Sandwich panel for performance evaluation is 7
Heated at 0 ° C. for 2 minutes.

The face material has a thickness of 0.5 m as the top material.
m liner paper was used, and 0.5 mm kraft paper was used as the lower surface material.

One day after production, the amount of change in thickness and the edge (the mouth)
The depth of the depression was measured and used as the primary shrinkage amount. The amount of contraction is
The smaller the value, the smaller the shrinkage. The method of measuring the amount of shrinkage on the wood surface is shown in FIG. t is the shrinkage amount.

(Thermal Conductivity) Thermal Conductivity Measuring Device M-88
(Manufactured by ANACON) is used, and the measurement conditions are JIS
It was measured according to A 9511.

The evaluation results are shown in Table 3. From these results, the rigid polyurethane foams of Examples 1 and 2 satisfying the constitution of the present invention were excellent in both primary shrinkage and thermal conductivity. In contrast, the conventional foam using the sucrose-based polyol has a large primary shrinkage amount. Further, in Comparative Example 2 in which the amount of the aromatic amine polyol used deviates from the range of the present invention, the thermal conductivity was not satisfactory.

[0062]

[Table 3] When the rigid polyurethane foam of Example 1 was used, it was possible to make a wooden house by the outer insulation method having the thickness shown in Table 4 below, as having the same heat insulation property as that shown in Table 1.

[0063]

[Table 4]

[Brief description of drawings]

[Fig. 1] 1 of the opening side of rigid polyurethane foam panel
Diagram showing measurement of secondary shrinkage

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) C08G 101: 00) C08G 101: 00 F term (reference) 4F074 AA80 AB00 AD16 AG10 BA34 BA35 BA39 BA53 BA95 CA23 CC04Y CC05Z DA07 DA15 DA18 DA32. QC01 RA05 RA10

Claims (6)

[Claims] 1. A polyol composition which is mixed with an isocyanate component containing a polyisocyanate compound as a main component to foam and cure to form a rigid polyurethane foam, which comprises a polyol compound, a foaming agent, a foam stabilizer and a catalyst. Including,
The polyol compound has a total average number of functional groups of 2 to 4, and 100 parts by weight of the polyol compound is (1) an average number of functional groups of 2 to 4 and a hydroxyl value of 400 to 600 mgKOH /
25 to 50 g of aromatic amine-based polyether polyol
Parts by weight, (2) hydroxyl value 400-900 mg KOH / g
Trimethylolalkane-based polyether polyol 1
0 to 30 parts by weight, (3) hydroxyl value 400 to 900 mgK
OH / g ethylenediamine-based polyether polyol 10 to 30 parts by weight (4) Average number of functional groups 2 to 4, hydroxyl value 150 to 400 m
gKOH / g aromatic polyester polyol 10-3
0 parts by weight, the blowing agent is HCFC-141
b) A polyol composition for rigid polyurethane foam, which contains at least one organic foaming agent selected from HFC compounds, n-pentane and cyclopentane. 2. The polyol composition for rigid polyurethane foam according to claim 1, wherein the foaming agent further contains water. 3. The polyol composition for rigid polyurethane foam according to claim 1, which further contains 5 to 30 parts by weight of a phosphate ester flame retardant with respect to 100 parts by weight of the polyol compound. 4. A bottom surface material supplying step of supplying a bottom surface material, a foaming stock solution supplying step of supplying a foaming stock solution composition obtained by mixing a polyol composition and an isocyanate component onto the bottom surface material,
A method for producing a rigid polyurethane foam, comprising: an upper surface material supplying step of supplying an upper surface material onto the foaming stock solution composition; and a foaming step of foaming and hardening the foaming stock solution composition to form a sandwich panel, wherein the polyol The composition is a polyol compound, a foaming agent,
The polyol compound has a total average number of functional groups of 2 to 4, and includes a foam stabilizer and a catalyst.
00 parts by weight is (1) average number of functional groups 2 to 4, hydroxyl value 4
25 to 50 parts by weight of aromatic amine-based polyether polyol of 00 to 600 mg KOH / g, (2) hydroxyl value 40
0 to 900 mg KOH / g trimethylolalkane-based polyether polyol 10 to 30 parts by weight, (3) hydroxyl value 400 to 800 mg KOH / g ethylenediamine-based polyether polyol 10 to 30 parts by weight (4) average number of functional groups 2 to 4, Hydroxyl value 150-400m
gKOH / g aromatic polyester polyol 10-3
0 parts by weight, the blowing agent is HCFC-141
A method for producing a rigid polyurethane foam, which comprises at least one organic foaming agent selected from b, an HFC compound, n-pentane, and cyclopentane. 5. The method for producing a rigid polyurethane foam according to claim 4, wherein the foaming agent further contains water. 6. The method for producing a rigid polyurethane foam according to claim 4, wherein the polyol composition further contains 5 to 30 parts by weight of a phosphate ester flame retardant with respect to 100 parts by weight of the polyol compound.