JP2009006564A - Manufacturing method of hard polyurethane foam panel and polyol composition for hard polyurethane foam - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method of a hard polyurethane foam panel which is a sandwich panel composed of: a water-foamed hard polyurethane foam; and metal plate face materials used on both surfaces of the hard polyurethane foam, hardly causes warping and is excellent in thermal insulating property, and to provide a polyol composition used for the manufacturing method of the hard polyurethane foam panel. <P>SOLUTION: The manufacturing method of the hard polyurethane foam panel 12 comprises: the lower face material 15 supplying process; a raw liquid supplying process of supplying a foaming starting liquid composition; the upper face material 14 supplying process; a foaming process; and a cutting process, wherein either upper face material or lower face material is a metal plate, one is a corrugated sheet and the other one is a flat sheet, the polyol composition includes a polyol compound, water as a foaming agent, a foam stabilizer and a catalyst, the polyol compound includes a resin fine particle-containing polyol compound, a gel time of the foaming starting liquid composition when both of the polyol composition and a polyisocyanate component are mixed while setting either temperature of both at 20°C is made to be 33 sec or more, and the surface hardness after two minutes of a foam obtained by the free-foaming is made to be 25 or more. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a method for producing a rigid polyurethane foam sandwich panel having a double-sided metal plate, one side of which is a corrugated plate.

  A rigid polyurethane foam sandwich panel using a metal plate such as a steel plate as a face material is known (Patent Document 1).

  The rigid polyurethane foam disclosed in Patent Document 1 has flame retardancy that complies with the flame retardancy standard stipulated in the Building Standards Act, has good adhesion to the face material, and does not generate a so-called share line. An aromatic ester polyol and a phenoxy alcohol compound are used as a polyol compound, and an organic carboxylic acid metal salt and an imidazole compound are used as a catalyst.

JP 2003-48943 A

  When a corrugated sheet is used as a single-sided metal sheet surface material and a sandwich panel is manufactured by a continuous production method, warpage in which the corrugated sheet side is concave occurs in the obtained sandwich panel. In the continuous production method, in order to set the thickness of the obtained sandwich panel to a predetermined value, the sandwich panel is pressed using a double conveyor in the foaming process. As a result, it is considered that the corrugated sheet is stretched so that the wave is flattened by the pressing, and when the corrugated sheet is released from the pressing of the double conveyor, the corrugated sheet contracts to the original sized corrugated sheet.

  Compared to conventional hard polyurethane foams that use foaming agents such as HCFC-141b other than water with many urethane bonds in the constituent molecules, hard polyurethane foams that use water as the foaming agent have more urea bonds in the constituent molecules. The brittleness is large. For this reason, when a sandwich panel having warpage is flattened at the time of construction, cracks occur in the hard polyurethane foam layer, which causes a decrease in heat insulation of the hard polyurethane foam layer. Therefore, there has been a demand for improvement so that warpage does not occur or warpage is reduced in a sandwich panel having a water-foamed rigid polyurethane foam as a heat insulating layer.

  The present invention is a water-foamed rigid polyurethane urethane foam sandwich panel that uses metal plate face materials on both sides in view of the above-mentioned problems of the known technology, and is a rigid polyurethane foam panel with low warpage and excellent heat insulation. Another object of the present invention is to provide a polyol composition for use in the production method of the present invention and the production method of the rigid polyurethane foam panel.

The present invention is a method for producing a rigid polyurethane foam panel,
A lower surface material supply step for supplying a lower surface material, a raw solution supply step for supplying a foamed stock solution composition obtained by mixing a polyol composition and a polyisocyanate component onto the lower surface material, and an upper surface for supplying an upper surface material on the foamed stock solution composition A material supply step, a foaming step of heating and foaming the foaming stock composition to form a continuous rigid polyurethane foam, and a cutting step of cutting the continuous rigid polyurethane foam into a predetermined length,
Both the upper surface material and the lower surface material are metal plates, one is a corrugated plate and the other is a flat plate,
The polyol composition contains a polyol compound, water as a foaming agent, a foam stabilizer and a catalyst,
The polyol compound contains a resin fine particle-containing polyol compound,
Both the polyol composition and the polyisocyanate component are mixed at a temperature of 20 ° C. to obtain a foamed stock solution composition, and the surface hardness after 2 minutes of the free foamed foam obtained by foaming the foamed stock solution composition is 20 or more. It is characterized by that.

  According to the manufacturing method having such a configuration, a rigid polyurethane foam panel which is a water-foamed rigid polyurethane foam foam panel using metal plate face materials on both sides and which is less warped and excellent in heat insulation is manufactured. be able to.

  When the surface hardness after 2 minutes of the free foamed foam formed by foaming of the foamed stock composition is less than 20, warpage occurs in the resulting sandwich panel. The surface hardness of the free foamed foam is a value measured with an Asker CS type hardness meter (F type). The surface hardness after 2 minutes of the free foamed foam is more preferably 22 or more, and further preferably 24 or more.

  In the above-mentioned method for producing a rigid polyurethane foam panel, the polyol compound constituting the resin fine particle-containing polyol compound is a polyether polyol having no amino group, an aromatic amino group-containing polyether polyol, or these two types of polyol compounds. A mixture is preferred.

  According to the production method having such a configuration, the surface hardness after 2 minutes of the free foamed foam obtained by foaming the foamed stock solution composition when the temperatures of the polyol composition and the polyisocyanate component are both mixed at 20 ° C. is 20 The above can be easily achieved.

  In the manufacturing method of said rigid polyurethane foam panel, it is preferable that the gel time of the foamed undiluted | mixed foam composition mixed by making the temperature of the said polyol composition and a polyisocyanate component 20 degreeC both is 33 second or more.

  According to the manufacturing method of such a configuration, a rigid polyurethane foam panel with less warpage and excellent heat insulation in a sandwich panel of water-foamed hard polyurethane foam using metal plate face materials on both sides more reliably. Can be manufactured. The gel time is more preferably 35 seconds or more.

The polyol composition for rigid polyurethane foam of the present invention contains a polyol compound, water as a foaming agent, a foam stabilizer and a catalyst, and is mixed with a polyisocyanate component to form a rigid polyurethane foam,
The polyol composition contains a resin fine particle-containing polyol compound,
Both the polyol composition and the polyisocyanate component are mixed at 20 ° C. to obtain a foamed stock solution composition, and the surface hardness after 2 minutes of the free foamed foam obtained by foaming the foamed stock solution composition is 20 or more. It is characterized by that.

  When producing a sandwich panel of water-foamed hard polyurethane foam using metal plate face materials on both sides using a polyol composition of such structure, even if one face material is a corrugated sheet, the occurrence of warpage is small, Even if it is flat at the time of construction, cracks do not occur in the hard polyurethane foam layer. Further, the rigid polyurethane foam having such a configuration is excellent in heat insulation.

  In the above polyol composition for rigid polyurethane foam, the polyol compound constituting the resin fine particle-containing polyol compound is a polyether polyol having no amino group, an aromatic amino group-containing polyether polyol, or these two types of polyol compounds. A mixture is preferred.

  The polyol composition having such a structure can easily have a surface hardness of 20 or more after 2 minutes of a free-foamed foam obtained by foaming a foamed stock composition in which the temperature of the polyisocyanate component to be mixed and reacted is 20 ° C. As a result of being able to adjust, when manufacturing a water-foamed hard polyurethane foam sandwich panel that uses metal plate face materials on both sides, even if one face material is corrugated, warpage is small and flat during construction Even so, cracks do not occur in the rigid polyurethane foam layer.

  In the method for producing a rigid polyurethane foam panel and the polyol composition for rigid polyurethane foam of the present invention, resin polyol-containing polyether polyol is used as the polyol compound constituting the polyol composition. As the resin fine particles, known resin fine particles contained in a polyol for polyurethane foam can be used. Specifically, homopolymer fine particles such as acrylonitrile, acrylonitrile, α-ethylacrylonitrile, styrene, vinyl acetate, acrylic monomers, etc. Alternatively, copolymer fine particles of two or more monomers selected from these monomers can be used.

  The polyol compound containing the resin fine particles can be produced by a known method. For example, a resin produced by a bulk polymerization method or a solution polymerization method is pulverized into fine particles, and a resin fine powder obtained by classification as necessary is added to and mixed with a polyol compound. A resin obtained by an emulsion polymerization method A method of adding an emulsion containing fine particles as it is or in a dry powder form, dissolving or dispersing a monomer in a polyol compound, adding a radical polymerization initiator such as AIBN or BPO, heating, and polymerizing the resin fine particle polyol Examples of the method include compounds. Among these, the method of polymerizing in a polyol compound to form resin fine particles is most preferable because the particles are less likely to settle even when left for a long period of time and a stable polyol composition is obtained.

  The polyether polyol constituting the polyol compound in which resin fine particles are dispersed is preferably a polyether polyol having no amino group, a polyether polyol having an aromatic tertiary amino group, or a mixture of these two kinds of polyol compounds. . Polyether polyols having no amino group include, as initiators, ethylene glycol, propylene glycol, 1,4-butanediol, 1,3-butanediol, 1,6-hexanediol, neopentyl glycol, cyclohexylene glycol, Use at least one of propylene oxide and ethylene oxide using glycols such as cyclohexanedimethanol, triols such as trimethylolpropane and glycerol, tetrafunctional alcohols such as pentaerythritol, polyhydric alcohols such as sorbitol and sucrose, and the like. A polyfunctional oligomer obtained by ring-opening addition polymerization of a seed, an aromatic compound such as aliphatic polyether polyol, hydroquinone, bisphenol A, and xylylene glycol is used as an initiator, and the above-mentioned polyester is used. Aromatic polyether polyols obtained in the same manner as ether polyol and the like. The polyether polyol having an aliphatic polyhydric alcohol as an initiator preferably has an average functional group number of 2.5 to 8 and a hydroxyl value of 100 to 600 mgKOH / g. The aromatic polyether polyol preferably has an average functional group number of 2 to 4 and a hydroxyl value of 200 to 600 mgKOH / g. Among these, it is particularly preferable to use a polyether polyol having pentaerythritol as an initiator.

  The polyether polyol having an aromatic tertiary amino group is a cyclic ether compound such as ethylene oxide (EO), propylene oxide (PO), butylene oxide, preferably propylene oxide alone, or propylene oxide, with an aromatic diamine as an initiator. And a polyol compound having a substantially tetrafunctional tertiary amino group obtained by ring-opening addition of ethylene oxide. As aromatic diamine which is an initiator, well-known aromatic diamine can be used without limitation. Specific examples include 2,4-toluenediamine, 2,6-toluenediamine, diethyltoluenediamine, 4,4'-diaminodiphenylmethane, p-phenylenediamine, o-phenylenediamine, naphthalenediamine and the like. Among these, use of toluenediamine (2,4-toluenediamine, 2,6-toluenediamine, or a mixture thereof: TDA) is particularly preferable in that the properties such as heat insulation and strength of the obtained rigid polyurethane foam are excellent. . The polyether polyol having an aromatic tertiary amino group preferably has a hydroxyl value of 200 to 500 mgKOH / g.

  In the case of using a polyether polyol having no amino group, a polyether polyol having an aromatic tertiary amino group, or a mixture of these two types of polyol compounds, an aromatic tertiary amino group-containing polyol is used in the composition of the polyol compound. The compound is preferably 70% by weight or more, and more preferably 80% by weight or more in the total amount of the polyol compound. When two or more types of polyol compounds are used in the resin fine particle-containing polyol compound of the present invention, one polyol compound may be used to make a resin fine particle-containing polyol compound, and then another polyol compound may be mixed.

  It is also preferable to use a commercially available product as the polyol compound in which the above-described monomeric resin fine particles are dispersed and the polyether polyol having an aromatic tertiary amino group as a constituent polyol is used. Are XRAG-7102 and WB-918 (Asahi Glass) manufactured by the polymerization method of monomers containing acrylonitrile in the above-mentioned polyol compound, and can be used. The resin content in the resin fine particle-dispersed polyol compound is well known (for example, Japanese Patent Application Laid-Open Nos. 11-60651 and 11-106447).

  As the catalyst, a known catalyst for producing polyurethane foam can be used. Specifically, the use of a tertiary amine catalyst is preferred. The tertiary amine catalyst is a urethane bond forming catalyst or a foaming catalyst. Specifically, N, N, N ′, N′-tetramethylethylenediamine or N, N, N ′, N′-tetramethylhexamethylene is used. N-alkyl polyalkylene polyamines such as diamine (kaolyzer No. 1), N, N, N ′, N ′, N ″ -pentamethyldiethylenetriamine (kaolyzer No. 3), diazabicycloundecene (DBU), N , N-dimethylcyclohexylamine (polycat-8), 1,3,5-tris (3-dimethylaminopropyl) -hexahydro-s-triazine (polycat-41), triethylenediamine, N-methylmorpholine, etc. Of these, the use of a compound having two or more tertiary amino groups in one molecule is preferred. The urethane bond-forming ability of the tertiary amine catalyst is preferably the reaction constant in the reaction of TDI and diethylene glycol (DEG) (urethanization reaction) and the reaction of TDI and water (foaming reaction). In the present invention, a catalyst having a reaction constant of TDI-water / TDI-DEG of 2 or less is preferably used. It is preferable that it is 0.1-0.5 weight part with respect to a polyol compound total 100 weight part.

  Adjustment of the gel time (GT) of the foamed stock solution composition in the present invention, the completion of stirring and mixing of the polyol composition and the polyisocyanate component, and the surface hardness of the free foamed foam 2 minutes after the start of the reaction can be achieved by, for example, combining a polyol compound and a catalyst. Can be achieved. That is, when a polyether polyol having no amino group is used as the polyol compound and a catalyst having a strong urethane bond forming ability is used as the catalyst, a rigid polyurethane foam having a surface hardness of 20 or more after 2 minutes can be produced. For example, the gel time of the foaming stock solution composition can be set to 33 seconds or more, preferably 35 seconds or more by adjusting the type and amount of the catalyst. The atmospheric temperature for foaming is 25 ° C.

  As the foam stabilizer added to the polyol composition, a foam stabilizer known in the field of rigid polyurethane foam can be used without limitation. Specifically, foam stabilizers such as B-8465 (Gold Schmidt), SH-193, S-824-02, SZ-1704, SZ-1605 (Toray Dow Corning Silicon) can be used. Two or more foam stabilizers may be used. The addition amount of the foam stabilizer is preferably 0.5 to 5% by weight with respect to 100 parts by weight of the polyol compound.

  In the present invention, it is also a preferable aspect to add a flame retardant, and examples of suitable flame retardants include organic phosphate esters. Organophosphates are suitable additives because they also have an action as a plasticizer and thus have an effect of improving the brittleness of rigid polyurethane foam. It also has the effect of reducing the viscosity of the polyol composition. Examples of the organic phosphate esters include halogenated alkyl esters of phosphoric acid, alkyl phosphate esters, aryl phosphate esters, phosphonate esters, and the like. Specifically, tris (β-chloroethyl) phosphate (CLP, Daihachi Chemical Industry), Tris (β-chloropropyl) phosphate (TMCPP, Daihachi Chemical Industry), Tributoxyethyl phosphate (TBXP, Daihachi Chemical Industry), Tributyl phosphate, Triethyl phosphate, Cresyl phenyl phosphate, Dimethylmethylphosphonate Etc., and one or more of these can be used. The addition amount of the organic phosphates is 40 parts by weight or less, more preferably 30 parts by weight or less, further preferably 25 parts by weight or less, and 5 to 25 parts by weight with respect to 100 parts by weight of the total polyol compound. Is particularly preferred.

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

  The polyisocyanate compound that forms a rigid polyurethane foam by mixing and reacting with the polyol composition is easy to handle, fast in reaction, excellent in the physical properties of the resulting rigid polyurethane foam, and low in cost. For this reason, liquid MDI is used. As liquid MDI, Crude MDI (c-MDI) (Sumijoule 44V-10, Sumijoule 44V-20, etc. (manufactured by Sumika Bayer Urethane Co., Ltd.), Millionate MR-200 (Nippon Polyurethane Industry)), uretonimine-containing MDI (Millionate) MTL (manufactured by Nippon Polyurethane Industry) or the like is used. In addition to liquid MDI, other polyisocyanate compounds may be used in combination. As the polyisocyanate compound used in combination, a polyisocyanate compound known in the technical field of polyurethane can be used without limitation.

  Examples of the metal material constituting the metal face material used in the method for producing a rigid polyurethane foam panel of the present invention include aluminum, stainless steel, steel plate, etc., and the use of a steel plate is common. The thickness of the face material made of a metal plate is set according to the metal material to be used and the application, but in the case of a steel plate, it is preferably 0.25 to 0.40 mm.

The density of the rigid polyurethane foam constituting the panel is preferably 15 to 45 kg / m ³ , more preferably 15 to 40 kg / m ³ in terms of free foaming density. Although the magnitude | size of the rigid polyurethane foam panel manufactured by this invention is not specifically limited, A width | variety is 1500 mm or less, More preferably, it is 1000 mm or less, It is preferable that thickness is 10-100 mm. Panel warpage is measured by the method shown in FIG. Both ends of the panel are set to be wave peaks, and the depth of the recesses is the distance t from the lowest portion of the wave peaks. The warpage rate (100 t / W; W is the width of the sandwich panel) is preferably 2.5% or less, and more preferably 2% or less.

  FIG. 1 is a schematic front view illustrating a preferred embodiment of the method for producing a rigid polyurethane foam panel of the present invention. The lower surface material 15 is unwound from the roll-shaped flat sheet 13 and supplied (lower surface material supplying step). The lower surface material 15 is processed into a corrugated plate shape by the corrugated processing roll 17 and supplied onto the conveyor 20. A plurality of sets of corrugated processing rolls 17 may be used. On the conveyor 20, a foamed stock solution composition obtained by mixing an isocyanate component and a polyol composition containing a polyol compound, a foaming agent and the like from a nozzle of a mixer 21 on a corrugated bottom material 19 has a uniform stock thickness in the width direction. It is distributed and supplied (stock solution supply process). The conveyor 20 supports the lower surface material 15 even after the foaming stock solution composition is supplied, and a belt conveyor, a roller conveyor, or the like can be used.

  An upper surface material is supplied onto the corrugated lower surface material 19 supplied with the foaming stock solution composition. The upper surface material 14 is unwound from the roll-shaped flat plate raw material 12 and supplied through the guide roll 16 onto the corrugated plate-shaped lower surface material 19 supplied with the foamed stock solution composition (upper surface material supply step). In the state where the foamed stock solution composition is sandwiched, the upper and lower face materials pass through the nip roller 23 to make the thickness of the foamed stock solution composition uniform and to improve the adhesion between the foam and the face material. Improvement is performed (nip process), and the foamed stock solution composition is foamed and sent between a pair of upper and lower double conveyors 27 (27a, 27b) installed in the heating oven 25.

  The wave shape of the corrugated plate of the lower surface material is not particularly limited, and may be a wave shape such as a sine curve or a trapezoidal wave shape. The wave height and pitch are set as appropriate, but the wave height (difference from the top of the mountain to the bottom of the valley) is preferably 5 to 25 mm, and the wave pitch is 10 to 60 mm. Is preferable, and it is more preferable that it is 20-40 mm.

  The foam stock solution composition sandwiched between the flat plate upper surface material 18 and the corrugated lower surface material 19 completes the foam curing while being regulated so as to have a constant thickness between the double conveyors 27. (Foaming process) A sandwich panel 10 is formed. The continuous rigid polyurethane foam sandwich panel 10 is cut into a predetermined length by the cutter 30 after leaving the heating oven 25 (cutting process), and becomes the rigid polyurethane foam sandwich panel 12. The lower surface material may be flat and the upper surface material may be corrugated.

Example 1
Polyether polyol EX- using 90 parts by weight of WB-918 (hydroxyl value 350 mgKOH / g; Asahi Glass), a resin fine particle-dispersed polyether composed of an aromatic tertiary amino group-containing polyether polyol, and sorbitol as an initiator. 550 (hydroxyl value 550 mg KOH / g) 10 parts by weight, TMCPP (Daihachi Chemical Industry) 15 parts by weight, foam stabilizer SH-193 (Toray Dow Corning Silicon) 0.5 parts by weight, foam stabilizer SZ-1704 (Toray Dow) Corning silicon) 0.4 parts by weight, catalyst kaolinizer no. A polyol composition was prepared by mixing 0.3 part by weight of 1 (Kao) and 5.0 parts by weight of water. As the polyisocyanate component, Sumidur 44V20 (Sumika Bayer Urethane) was used, and the polyol composition / polyisocyanate component mixing ratio was 100/70 (weight ratio).
(Example 2)
WB-918 (Hydroxyl value 350 mgKOH / g; Asahi Glass) which is a fine particle dispersed polyether, 15 parts by weight of TMCPP (Daihachi Chemical Industry), 0.7 parts by weight of foam stabilizer SH-193 (Toray Dow Corning Silicon) , Foam stabilizer SZ-1704 (Toray Dow Corning Silicone) 0.4 parts by weight, catalyst kaolinizer No. A polyol composition was prepared by mixing 0.3 part by weight of 1 (Kao) and 5.0 parts by weight of water. As the polyisocyanate component, Sumidur 44V20 (Sumika Bayer Urethane) was used, and the polyol composition / polyisocyanate component mixing ratio was 100/68 (weight ratio).
(Comparative example)
A polyol composition was prepared in the same manner as in Example 1 except that 100 parts by weight of resin fine particle-dispersed polyether polyol using a polyether polyol (hydroxyl value 350 mgKOH / g) using ethylenediamine as an initiator was used.

(Evaluation methods)
1) Density Foam stock solution obtained by mixing a polyol composition with a liquid temperature adjusted to 20 ° C. and a polyisocyanate component for 7 seconds with a high-speed stirrer is poured into a mold having a length, width of 40 cm, and depth of 40 cm for free. A foam having a length, width, and height of 20 cm was cut out from the core of the foamed foam, and the weight was measured for calculation.
2) Gel time (GT), surface hardness Gel time and surface hardness were measured in the above free foaming. The surface hardness was measured using an Asker CS hardness meter F type (polymer meter) with a load of 1 kg.
3) Panel Warpage A double-sided steel sheet sandwich panel was produced on the panel production line shown in FIG. The steel plate used had a thickness of 0.027 mm, and the bottom material was a sine curve corrugated plate with a wave height of 9.5 mm and a pitch of 32 mm. The total thickness of the panel was adjusted to about 55 mm. The warpage of the panel was measured by the method shown in FIG. In addition, the sandwich panel obtained was cut after being mounted on a flat surface, inspected whether a crack was generated in the hard polyurethane foam layer, ○ if there was no crack, ○ if there was a crack did.
4) Thermal insulation The thermal insulation of the rigid polyurethane foam was evaluated by thermal conductivity. The thermal conductivity was measured according to JIS A 9511 using a thermal conductivity measuring device AUTO-Λ HC-074 (manufactured by Eiko Seiki Co., Ltd.).
5) Closed cell ratio Micromeritics AccuPyc 1330 (Shimadzu Corporation) was used as a measuring device, and the closed cell ratio was measured.

  From the results shown in Table 1, the rigid polyurethane foam sandwich panel according to the present invention had a low thermal conductivity and a small warp, and no cracks were generated in the rigid polyurethane foam layer even when it was applied flatly. On the other hand, the sandwich panel using the foam having a short gel time was greatly warped, and cracks occurred in the hard polyurethane foam layer when it was applied flatly.

The schematic front view which illustrated the suitable aspect of the manufacturing method of the rigid polyurethane foam panel of this invention Sectional view showing the method of measuring the warpage of the sandwich panel

Explanation of symbols

10 rigid polyurethane foam 12 rigid polyurethane foam sandwich panel 14 upper surface material 15 lower surface material 27 double conveyor

Claims (4)

A method of manufacturing a rigid polyurethane foam panel,
A lower surface material supply step for supplying a lower surface material, a raw solution supply step for supplying a foamed stock solution composition obtained by mixing a polyol composition and a polyisocyanate component onto the lower surface material, and an upper surface for supplying an upper surface material on the foamed stock solution composition A material supply step, a foaming step of heating and foaming the foaming stock composition to form a continuous rigid polyurethane foam, and a cutting step of cutting the continuous rigid polyurethane foam into a predetermined length,
Both the upper surface material and the lower surface material are metal plates, one is a corrugated plate and the other is a flat plate,
The polyol composition contains a polyol compound, water as a foaming agent, a foam stabilizer and a catalyst,
The polyol compound contains a resin fine particle-containing polyol compound,
Both the polyol composition and the polyisocyanate component are mixed at a temperature of 20 ° C. to obtain a foamed stock solution composition, and the surface hardness after 2 minutes of the free foamed foam obtained by foaming the foamed stock solution composition is 20 or more. A method for producing a rigid polyurethane foam panel, characterized in that:   The rigid polyurethane foam according to claim 1, wherein the polyol compound constituting the resin fine particle-containing polyol compound is a polyether polyol having no amino group, an aromatic amino group-containing polyether polyol, or a mixture thereof. Panel manufacturing method. A polyol composition containing a polyol compound, water as a blowing agent, a foam stabilizer and a catalyst, and mixed with a polyisocyanate component to form a rigid polyurethane foam,
The polyol compound contains a resin fine particle-containing polyol compound,
Both the polyol composition and the polyisocyanate component are mixed at a temperature of 20 ° C. to obtain a foamed stock solution composition, and the surface hardness after 2 minutes of the free foamed foam obtained by foaming the foamed stock solution composition is 20 or more. A polyol composition for rigid polyurethane foam characterized by the above.   The rigid polyurethane foam according to claim 3, wherein the polyol compound constituting the resin fine particle-containing polyol compound is a polyether polyol having no amino group, an aromatic amino group-containing polyether polyol, or a mixture thereof. Polyol composition.

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