JP5314169B2 - Polyurethane foam panel and manufacturing method thereof - Google Patents

Description

  The present invention relates to a polyurethane foam panel having a low density and excellent heat insulation performance using a foaming stock solution composition containing a polyol compound and a polyol composition containing water as a foaming agent and a polyisocyanate component as raw materials. It relates to a manufacturing method.

  Conventionally, glass wool has been widely used as a heat insulating material for buildings such as detached houses. Glass wool is not necessarily sufficient in its heat insulation performance, but it is considered that it is a reason why it is widely used because it is inexpensive. On the other hand, polyurethane foam panels are superior in heat insulation performance to glass wool, but are not as widely used as glass wool because of their high price.

As a method of reducing the price of the polyurethane foam panel, it is conceivable to reduce the density while maintaining the heat insulation performance of the foam panel. In the following Patent Document 1, a polyol composition consisting of a polyoxyalkylene polyether polyol having a number average molecular weight of 2000 to 9000 and a polyoxyalkylene polyether polyol having a number average molecular weight of 250 to 750 is used as a raw material. It describes that a low density rigid polyurethane foam having a core density of 2 kg / m ³ or more and 20 kg / m ³ or less is produced. However, when the polyol composition described in this document is used as a raw material, there is a limit to reducing the density of the foam in consideration of cell roughness (foam appearance failure), brittleness (fogging of the foam), and the like. Moreover, since the rigid polyurethane foam described in this literature assumes the spraying use, it is important that it is a low restoration rate, and it is inferior to the softness | flexibility of foam.

In the following Patent Document 2, a polyether polyol having an average functional group number of 2.5 to 4 and a hydroxyl value of 200 to 300 mgKOH / g, a polyether polyol having an average functional group number of 4 to 6 and a hydroxyl value of 400 to 900 mgKOH / g, and an average functionality Low density whose core density is 5 kg / m ³ or more and 14 kg / m ³ or less by continuous slab foaming using a polyether polyol having a group number of 2.5 to 3.5 and a hydroxyl value of 20 to 60 mg KOH / g and a polyol composition as a raw material. The point of producing a density rigid polyurethane foam is described. However, even in the rigid polyurethane foam described in this document, there is a limit to reducing the density of the foam in consideration of cell roughness (foam appearance failure), brittleness (foaming of the foam), and the like.

  In the following Patent Document 3, (a) a polyoxyalkylene polyol having a functional group number of 2 to 3.5, a hydroxyl value of 28 to 90 mgKOH / g and a polyoxyethylene unit content of 5% by weight or less, (b) a functional group number of 3 to 3 6 and a polyoxyalkylene polyol having a hydroxyl value of 150 to 500 mgKOH / g, and (c) a mixture of a polyol having 2 to 3 functional groups and a hydroxyl value of 450 to 840 mgKOH / g, and 100 parts by weight of the mixture of the above polyols And a process for producing an open-celled rigid polyurethane foam using 6 to 12 parts by weight of water as a blowing agent. However, in such a manufacturing method, the lower limit of the foam density is determined from the viewpoint of foam strength, and there is a limit to reducing the density of the foam.

  By the way, when reducing the density of polyurethane foam panels, it is important to lower the closed cell ratio of the foam cells and increase the ratio of open cells. However, the invention described in the above-mentioned patent document is merely focused on only the blending of the polyol composition. For example, in the shape of a low-density polyurethane foam panel, in the manufacturing process, etc. Was not done.

JP 2002-293868 A Japanese Patent No. 4079254 Japanese Patent Laid-Open No. 06-25375

  The present invention has been made in view of the above circumstances, and an object thereof is a polyurethane foam having a low density and excellent flexibility and heat insulation performance, and useful as a heat insulating material for buildings such as detached houses. It is in providing a panel and its manufacturing method.

  As a result of diligent investigation regarding the solution to the above problems, the present inventors devised the composition of the polyol composition as a raw material and the isocyanate index (NCO Index) when the polyol composition and the polyisocyanate component are mixed and reacted. Thus, the present inventors have found that a polyurethane foam panel having low density but no foam stuffiness (brittleness) and having excellent flexibility and heat insulation performance can be obtained. Furthermore, it has been found that by setting the thickness direction of the polyurethane foam panel and the foaming direction of the cells substantially perpendicular to each other, the heat insulation performance can be enhanced most efficiently when used as a heat insulating material. The present invention has been accomplished based on the above findings, and is configured as follows.

  The above object can be achieved by the present invention as described below. That is, the polyurethane foam panel according to the present invention is a polyurethane foam panel obtained by mixing and reacting a polyol composition and a polyol composition containing water as a foaming agent and a polyisocyanate component, wherein the polyol compound is The polyether polyol (A), which has an average number of functional groups of 2 to 4 and a weight average molecular weight of 3000 to 8000 and is a polymer of alkylene oxide, and a short glycol (B) having a molecular weight of less than 250 In addition, 20 to 100 parts by weight of the water is contained with respect to 100 parts by weight of the polyol compound, and the isocyanate index when the polyol composition and the polyisocyanate component are mixed and reacted is 30 or less. And

  The polyol composition contains 20 to 100 parts by weight of water as a blowing agent. For this reason, when this polyol composition is used as a raw material, a low-density polyurethane foam panel can be produced.

  By the way, when only a high molecular weight polyether polyol is contained as a polyol compound and the blending amount of water in the polyol composition is increased, the resin strength becomes insufficient at the foaming stage of the foam, and the foaming gas in the foam Many omissions occur and foam shrinkage tends to occur. As a result, the density of the foam tends to be insufficient. However, since the polyol composition contains the high-molecular-weight polyether polyol (A) and the short glycol (B) having a molecular weight of less than 250, the speed of thickening (resinization speed) is high at the early stage of foam foaming. Become. Thereby, the restoration rate of the foam is increased due to the high molecular weight polyether polyol (A), and the resin strength is increased from the early stage of foam foaming due to the low molecular weight short glycol (B). As a result, a polyurethane foam panel having low density and excellent flexibility can be produced.

  Further, since the polyol composition contains the high molecular weight polyether polyol (A) and the low molecular weight short glycol (B), the cell diameter of the foam is reduced even if the density of the foam is reduced. As a result, foam cell roughness (foam appearance defect) can be prevented, and foam brittleness can be suppressed and brittleness can be reduced.

  The polyurethane foam panel according to the present invention has excellent flexibility because it uses a specific polyol composition and has an isocyanate index of 30 or less when the polyol composition and the polyisocyanate component are mixed and reacted. For this reason, when a polyurethane foam panel is fitted into, for example, a predetermined shape between pillars, it is easy to fit, and the polyurethane foam panel is easily fitted.

  In the polyurethane foam panel, it is preferable that the thickness direction of the polyurethane foam panel and the foaming direction of the cells in the foam are substantially perpendicular. As described above, the polyurethane foam panel according to the present invention has a low density, the cells in the foam are individually substantially elliptical, and a plurality of cells communicate with each other, and the open cell ratio is high. Furthermore, when the thickness direction of the polyurethane foam panel and the foaming direction of the cells in the foam are substantially perpendicular, heat transfer in the thickness direction can be suppressed. Therefore, when a polyurethane foam panel is disposed in a building such as a detached house, the heat insulation performance in the thickness direction is particularly enhanced.

  The polyurethane foam panel preferably contains 10 to 80 parts by weight of the polyether polyol (A) and 10 to 60 parts by weight of the short glycol (B) in 100 parts by weight of the polyol compound. According to such a configuration, it is possible to increase the foam recovery rate and reduce the foam cell diameter while increasing the resin strength of the foam. As a result, the brittleness and flexibility can be further improved in a balanced manner while reducing the density of the polyurethane foam panel.

  In the polyurethane foam panel, it is preferable that the polyol compound further includes a polyether polyol (C) having an average functional group number of 2 to 4, a weight average molecular weight of 3000 to 5000, and a polymer of propylene oxide. . When the high molecular weight polyether polyol (C), which is a propylene oxide polymer, is contained as the polyol compound, the cell membrane of the foam is broken at the end of the foaming stage of the foam, and an open-cell polyurethane foam panel tends to be formed. As a result, the density of the foam can be reduced more reliably while suppressing shrinkage of the foam.

  The method for producing a polyurethane foam panel according to the present invention is a method for producing a polyurethane foam panel obtained by using as a raw material a foamed stock solution composition containing a polyol compound and a polyol composition containing water as a foaming agent and a polyisocyanate component. The polyol compound has a polyether glycol (A) which is an alkylene oxide polymer having an average number of functional groups of 2 to 4, a weight average molecular weight of 3000 to 8000, and a short glycol having a molecular weight of less than 250. (B), and 100 parts by weight of the polyol compound, 20 to 100 parts by weight of the water, and the isocyanate index when the polyol composition and the polyisocyanate component are mixed and reacted. 30 or less. According to this manufacturing method, it is possible to manufacture a polyurethane foam panel having a low density and having excellent flexibility and heat insulation performance.

  In the method for producing a polyurethane foam panel, an injection step of injecting the foamed stock solution composition with a side surface extending in the longitudinal direction and the thickness direction as a bottom surface for a mold having a longitudinal direction, a width direction, and a thickness direction; And a reaction step of reacting the foamed stock solution composition after the injection step. According to this production method, the polyurethane foam panel having excellent heat insulation performance in the thickness direction can be efficiently produced because the thickness direction of the polyurethane foam panel and the foaming direction of the cells in the foam are substantially perpendicular.

  In the method for producing a polyurethane foam panel, it is preferable that 10 to 80 parts by weight of the polyether polyol (A) and 10 to 60 parts by weight of the short glycol (B) are contained in 100 parts by weight of the polyol compound. .

  Further, in the method for producing a polyurethane foam panel, the polyol compound further comprises a polyether polyol (C) having an average functional group number of 2 to 4 and a weight average molecular weight of 3000 to 5000, which is a polymer of propylene oxide. It is preferable to contain.

It is a figure which shows an example of the manufacturing method of the polyurethane foam panel of this invention . It is a figure which shows an example of the manufacturing method of the conventional polyurethane foam panel.

  The polyol composition used as the raw material for the polyurethane foam panel according to the present invention is a polyether polyol (polyol polyol) having an average number of functional groups of 2 to 4 and a weight average molecular weight of 3000 to 8000 as a polyol compound, which is a polymer of an alkylene oxide. A) and short glycol (B) having a molecular weight of less than 250.

  The polyether polyol (A) is a polyoxyalkylene polyol obtained by ring-opening addition polymerization of alkylene oxide to an initiator having 2 to 4 active hydrogen atoms. Specific examples of the initiator include aliphatic polyhydric alcohols (for example, ethylene glycol, propylene glycol, diethylene glycol, dipropylene glycol, 1,4-butanediol, 1,3-butanediol, 1,6-hexane. Diols, neopentyl glycol, cyclohexylene glycol, glycols such as cyclohexanedimethanol, triols such as trimethylolpropane and glycerin, tetrafunctional alcohols such as pentaerythritol, aliphatic amines (eg, ethylenediamine, propylenediamine, butylenediamine) , Alkylene diamines such as hexamethylene diamine and neopentyl diamine, alkanol amines such as monoethanolamine and diethanolamine), aromatic amines (for example, 2, -Toluenediamine, 2,6-toluenediamine, diethyltoluenediamine, 4,4'-diaminodiphenylmethane, p-phenylenediamine, o-phenylenediamine, naphthalenediamine, etc.), each of which is used alone. However, it is preferable to use an aliphatic alcohol as the initiator, more preferably a triol, more preferably glycerin, and the polyether polyol (A) may be used in combination. The average functional group number is 2 to 4, more preferably 2.5 to 3.5, and the polyether polyol (A) more preferably has a weight average molecular weight of 3000 to 5000.

  Examples of the alkylene oxide include ethylene oxide, propylene oxide, 1,2-butylene oxide, 2,3-butylene oxide, styrene oxide, and cyclohexene oxide. Among these, it is preferable to use ethylene oxide and propylene oxide in combination to cause ring-opening addition polymerization to the initiator. At that time, the ratio of ethylene oxide ((ethylene oxide) / (ethylene oxide + propylene oxide)) is preferably 5% to 30%.

  The hydroxyl value of the polyether polyol (A) is preferably 20 to 100 mgKOH / g, and more preferably 30 to 60 mgKOH / g. When the hydroxyl value is less than 20 mg KOH / g, the viscosity ratio of the polyol composition to the polyisocyanate component increases, leading to poor stirring during mixing. On the other hand, when it exceeds 100 mgKOH / g, it becomes difficult to impart appropriate toughness to the obtained polyurethane foam. The hydroxyl value is a value measured according to JIS K1557-1: 2007.

Short glycol (B) having a molecular weight of less than 250 includes, for example, ethylene glycol (molecular weight 62), propylene glycol (molecular weight 76), diethylene glycol (molecular weight 106), dipropylene glycol (molecular weight 134), 1,4-butanediol (molecular weight). 90), 1,3-butane diol (molecular weight 90), 1,6-hexanediol (molecular weight 118), preparative polypropylene glycol (molecular weight 192), and the like. Among these, in order to increase the resin strength of the foam more reliably, diethylene glycol, dipropylene glycol is preferred, diethylene glycol is particularly preferred. The molecular weight of the short glycol (B) is preferably 62 to 200 mgKOH / g, and more preferably 90 to 150 mgKOH / g.

  In the polyol composition for polyurethane foam according to the present invention, as the polyol compound, polyether polyol (C) having an average number of functional groups of 2 to 4 and a weight average molecular weight of 3000 to 5000, which is a polymer of propylene oxide. It is preferable to contain. The polyether polyol (C) is a polyoxyalkylene polyol obtained by ring-opening addition polymerization of propylene oxide alone to an initiator having 2 to 4 active hydrogen atoms. Examples of the initiator include the aliphatic polyhydric alcohols, aliphatic amines, and aromatic amines described above, and are not particularly limited. As the initiator, glycerol is particularly preferable.

  In the polyol composition used as a raw material in the present invention, 10 to 80 parts by weight of the polyether polyol (A) in 100 parts by weight of the polyol compound in order to produce a polyurethane foam panel having a low density and excellent heat insulating performance. It is preferable to contain 10 to 60 parts by weight of the short glycol (B), 15 to 70 parts by weight of the polyether polyol (A), and 10 to 50 parts by weight of the short glycol (B). More preferred. When the polyether polyol (C) is contained, the polyether polyol (A) is contained in an amount of 10 to 30 parts by weight, the short glycol (B) is contained in an amount of 10 to 60 parts by weight, and the polyether polyol (C) 30. ~ 70 parts by weight, preferably 15 to 25 parts by weight of polyether polyol (A), 10 to 50 parts by weight of short glycol (B), and 40 to 60 parts by weight of polyether polyol (C) It is more preferable to contain part.

  Water is added to the polyol composition as a foaming agent. The foaming agent is preferably water alone, and the blending amount thereof is 20 to 100 parts by weight with respect to 100 parts by weight of the polyol compound, more preferably 30 to 90 parts by weight, and further preferably 40 to 80 parts by weight. Part. Thus, the density of a polyurethane foam panel can be reduced by blending a large amount of water.

The core density of the polyurethane foam panel according to the present invention is preferably 20 kg / m ³ or less, more preferably 15 kg / m ³ or less, and further preferably 12 kg / m ³ or less. Such foam density can be set within the above range by adjusting the amount of water as a foaming agent to 20 to 100 parts by weight (vs. 100 parts by weight of polyol compound), for example. Here, the foam density is a value measured according to JIS K7222.

  Usually, a flame retardant, a catalyst, and a foam stabilizer are further blended in the polyol composition. Moreover, you may further mix | blend the various additives mix | blended with the polyol composition for polyurethane foams, such as a coloring agent and antioxidant.

  Examples of the flame retardant include metal compounds such as organophosphates, halogen-containing compounds, and aluminum hydroxide. Particularly, organophosphates are preferable because they have an effect of reducing the viscosity of the polyol composition. Examples of the organic phosphate ester include halogenated alkyl ester of phosphoric acid, alkyl phosphate ester, aryl phosphate ester, and phosphonate ester. Specific examples include tris (chloropropyl) phosphate (TMCPP, manufactured by Daihachi Chemical), tributoxyethyl phosphate (TBEP), tributyl phosphate, triethyl phosphate, trimethyl phosphate, cresyl phenyl phosphate, and the like. It is preferable that the compounding quantity of a flame retardant is 10-50 weight part with respect to 100 weight part of polyol compounds, More preferably, it is 15-40 weight part. In particular, when the flame retardant is contained in an amount of 20 parts by weight or more with respect to 100 parts by weight of the polyol compound in addition to the polyether polyol (A) and the short glycol (B) in the polyol composition, the brittleness of the foam is prevented. This is preferable.

  Although it will not specifically limit if it is a catalyst which accelerates | stimulates a urethanation reaction, Preferably it is using the reactive amine catalyst which can react with the isocyanate group of a polyisocyanate component. Examples of such reactive amine catalysts include N, N-dimethylethanolamine, N, N-dimethylaminoethoxyethanol, N, N, N′-trimethylaminoethylethanolamine, N, N, N ′, N ′. -Tetramethyl-2-hydroxypropylenediamine, N-hydroxyethylmorpholine, N-methyl-N-hydroxyethylpiperazine, N, N-dimethylpropylenediamine and the like.

  In addition, a normal tertiary amine catalyst can also be used, and as such a tertiary amine catalyst, N, N, N ′, N′-tetramethylethylenediamine, N, N, N ′, N′— Examples include tetramethylhexamethylenediamine, N, N, N ′, N ′, N ″ -pentamethyldiethylenetriamine, diazabicycloundecene, N, N-dimethylcyclohexylamine, triethylenediamine, and N-methylmorpholine.

  The compounding amount of the catalyst is preferably 2 to 10 parts by weight, more preferably 3 to 8 parts by weight with respect to 100 parts by weight of the polyol compound.

  Examples of the foam stabilizer include, among known foam stabilizers for polyurethane foams, a graft copolymer of polyoxyalkylene glycol, which is a polymer of ethylene oxide or propylene oxide, and polydimethylsiloxane. Silicone foam stabilizers having an oxyethylene group content of 70 to 100 mol% in oxyalkylene are preferably used. Specifically, SH-193, SF-2937F, SF-2938F (manufactured by Toray Dow Corning Silicone), B-8465, B-8467, B-8481 (made by Evonik Degussa Japan), L-6900 (made by Momentive) etc. are mentioned. The blending amount of the foam stabilizer is preferably 1 to 10 parts by weight with respect to 100 parts by weight of the polyol compound.

  As the polyisocyanate component that forms a polyurethane foam panel by mixing and reacting with the above polyol composition, various polyisocyanate compounds such as aromatic, alicyclic, and aliphatic groups having two or more isocyanate groups are used. Can do. Preferably, liquid diphenylmethane diisocyanate (MDI) is used because it is easy to handle, fast in reaction, excellent in physical properties of the resulting polyurethane foam, and low in cost. As liquid MDI, Crude MDI (c-MDI) (44V-10, 44V-20, etc. (manufactured by Sumika Bayer Urethane Co., Ltd.), Millionate MR-200 (Nippon Polyurethane Industry)), Murenate-containing MDI (Millionate MTL; Nippon Polyurethane) Industrial)). In addition to liquid MDI, other polyisocyanate compounds may be used in combination. As the polyisocyanate compound to be used in combination, a polyisocyanate compound known in the technical field of polyurethane can be used without limitation.

  In the polyurethane foam panel according to the present invention, it is important to set the isocyanate index (NCO Index) at 30 or less, more preferably less than 30, when the polyol composition and the polyisocyanate component are mixed and reacted. As a minimum of an isocyanate index, 20 is mentioned, for example. By setting the isocyanate index within the above range, a polyurethane foam panel having low density and excellent flexibility and heat insulation performance can be obtained. Here, the isocyanate index is the percentage equivalent of the isocyanate group of the polyisocyanate component to all active hydrogen groups contained in the polyol composition (calculated using water as a blowing agent as a bifunctional active hydrogen compound). (Equivalent ratio of isocyanate groups to 100 equivalents of active hydrogen groups).

  In the polyurethane foam panel according to the present invention, the thickness direction of the polyurethane foam panel and the foaming direction of the cells in the foam are preferably substantially perpendicular. In the present invention, “substantially vertical” specifically means 90 ° ± 15 °, and particularly 90 ° ± 10 °. The “foaming direction of the cells in the foam” means the major axis direction when each cell shape is regarded as an ellipse. In particular, the center part in the width direction (from the width direction center to both sides, the width direction length). The direction when measured in a portion of about 10%).

The polyurethane foam panel according to the present invention has the following production method:
A process for producing a polyurethane foam panel obtained from a foamed stock solution composition comprising a polyol compound and a polyol composition containing water as a foaming agent and a polyisocyanate component, wherein the polyol compound has an average number of functional groups of 2 A polyol polyol (A) having a weight average molecular weight of 3000 to 8000, a polymer of alkylene oxide, and a short glycol (B) having a molecular weight of less than 250, and having a polyol compound of 100 weight 20 to 100 parts by weight of water with respect to parts, and can be produced by a method for producing a polyurethane foam panel having an isocyanate index of less than 30 when the polyol composition and the polyisocyanate component are mixed and reacted. In order to produce a polyurethane foam panel in which the thickness direction of the polyurethane foam panel and the foaming direction of the cells in the foam are substantially perpendicular, in the longitudinal direction and the thickness direction, the mold has a longitudinal direction, a width direction and a thickness direction. A production method comprising an injection step of injecting the foamed stock solution composition with the extending side surface as a bottom surface and a reaction step of reacting the foamed stock solution composition after the injection step is preferable.

  In the conventional method for producing a polyurethane foam panel, as shown in FIG. 2, a polyol composition and a polyisocyanate component are contained on the surface material 3 from the mixing head 1 while being unwound and supplied from the raw material. The foaming stock solution composition to be injected is injected (injection step). After the injection step, the foamed stock solution composition is reacted while the foamed stock solution composition is covered with another surface material (back surface material) 4 (reaction step). As a result, a polyurethane foam panel having a foaming direction parallel to the thickness direction is obtained. In particular, in a low-density polyurethane foam panel, since each cell is an open cell, the heat transfer is large in the foaming direction, and the heat insulation performance tends to decrease. For this reason, in the manufacturing method of the conventional polyurethane foam panel, there existed a tendency for the heat insulation performance in the thickness direction to deteriorate.

  On the other hand, in the method for producing a polyurethane foam panel according to the present embodiment, for example, as shown in FIG. 1, a side surface extending in the longitudinal direction a and the thickness direction c with respect to the mold 2 having the longitudinal direction a, the width direction b, and the thickness direction c. Is the bottom surface X, and a foaming stock solution composition containing a polyol composition and a polyisocyanate component is injected from the mixing head 1 (injection step). After the injection, the foamed stock solution composition reacts and forms a foam while foaming (swelling) in the width direction b (reaction process). As a result, a polyurethane foam panel in which the foaming direction (width direction b) and the thickness direction c are substantially perpendicular is obtained. In the reaction step, the mold may be heated as a whole or locally as necessary.

  The polyurethane foam panel obtained by the production method preferably has a closed cell ratio of 15% or less, more preferably 0 to 10%. By increasing the communication rate in this way, it is possible to ensure excellent dimensional stability as a polyurethane foam. Here, the closed cell ratio is a value measured according to ASTM D2856.

  The polyurethane foam panel obtained by the production method preferably has a thermal conductivity λ of λ ≦ 0.04 W / m · K. In this case, even if the polyurethane foam has a reduced density, sufficient heat insulating performance can be exhibited. Here, the thermal conductivity is a value measured in accordance with JIS A1412-2.

  EXAMPLES Hereinafter, although an Example demonstrates this invention further in detail, this invention is not limited to these Examples.

(Preparation of polyol composition)
A polyol composition was prepared with the formulation described in Table 1 below. The details of each component in Table 1 are as follows.

(1) Polyol compound Polyether polyol (A) -1; polyether polyol obtained by addition polymerization of ethylene oxide and propylene oxide using the trade name “Exenol-820” (manufactured by Asahi Glass Co., Ltd.) and glycerol as an initiator. Weight average molecular weight 4900, hydroxyl value (OHV) = 34 mgKOH / g)
Polyether polyol (A) -2; trade name “EXCENOL-850” (manufactured by Asahi Glass Co., Ltd.), polyether polyol obtained by addition polymerization of ethylene oxide and propylene oxide using glycerol as an initiator (weight average molecular weight 7000, Hydroxyl value (OHV) = 25 mgKOH / g)
Short glycol (B) -1; diethylene glycol (DEG) (molecular weight 106, hydroxyl value (OHV) = 1058 mg KOH / g, manufactured by Nacalai Tesque)
Polyether polyol (C); trade name “T-3000S” (manufactured by Mitsui Chemicals), polyether polyol obtained by addition polymerization of only propylene oxide using glycerol as an initiator (weight average molecular weight 3000, hydroxyl value = 56mgKOH / g)

(2) Flame retardant: Trade name “TMCPP” (Daihachi Chemical Co., Ltd.)
(3) Foam stabilizer Foam stabilizer-1; silicone-based nonionic surfactant, trade name “SF-2938F” (manufactured by Toray Dow Corning Silicone)
(4) Catalyst Catalyst-1; Tertiary amine catalyst, trade name “TOYOCAT-ET” (manufactured by Tosoh Corporation)
Catalyst-2; N, N-dimethylaminoethoxyethanol, trade name “Kao No. 26” (manufactured by Kao Corporation)

(Panel evaluation)
Example 1-3
Using a polyol composition and a polyisocyanate component (c-MDI (“Sumijoule 44V-10” manufactured by Sumika Bayer Urethane Co., Ltd., NCO%: 31%) adjusted with the formulation shown in Table 1), an isocyanate index (NCO Index) 1 is mixed on the bottom surface X of the mold (longitudinal direction a length 1820 mm, width direction b length 400 mm, thickness direction c length 100 mm) shown in FIG. Injected from. Thereafter, the foamed stock solution composition was reacted to produce a polyurethane foam panel having substantially the same shape as the space in the mold and having the thickness direction of the panel and the foaming direction of the cells in the foam being substantially perpendicular (90 °). The results are shown in Table 1.

[Weight average molecular weight]
The weight average molecular weight was measured by GPC (gel permeation chromatography) and converted by standard polystyrene.
GPC device: manufactured by Shimadzu Corporation, LC-10A
Column: Polymer Laboratories, (PLgel, 5 μm, 500 Å), (PLgel, 5 μm, 100 及 び), and (PLgel, 5 μm, 50 Å) are connected and used. Flow rate: 1.0 ml / min
Concentration: 1.0 g / l
Injection volume: 40 μl
Column temperature: 40 ° C
Eluent: Tetrahydrofuran

[Form density]
The foam density was determined according to JIS K 7222.

[Thermal conductivity]
Based on JIS A9526 (Blowing rigid urethane foam for thermal insulation of buildings), it conforms to JIS A1412-2 (Measurement method of thermal resistance and thermal conductivity of thermal insulation materials-Part 2: Heat flow meter method) (HFM method). The thermal conductivity in the thickness direction of the panel was measured.

[Workability of inserting polyurethane foam panels into specified shapes]
If it is possible to compress 10% with a 400 mm width panel and easily fit into a 360 mm width, the polyurethane foam panel can be fitted with good workability because it is flexible for a given width (in the table, ○). It was judged.

  From the results in Table 1, it can be seen that the polyurethane foam panel of Example 1-3 has a low density, small brittleness, and excellent heat insulating performance in the thickness direction. Moreover, since it has the outstanding softness | flexibility, it turns out that it is excellent also in fitting workability | operativity.

Claims (6)

A polyurethane foam panel obtained by mixing and reacting a polyol compound and a polyol composition containing water as a blowing agent and a polyisocyanate component,
The polyol compound has an average functional group number of 2 to 4, a weight average molecular weight of 3000 to 8000, a polyether polyol (A) which is a polymer of alkylene oxide, and a short glycol (B) having a molecular weight of less than 250 And containing
20 to 100 parts by weight of the water is contained with respect to 100 parts by weight of the polyol compound,
A polyurethane foam panel having an isocyanate index of 30 or less when the polyol composition and the polyisocyanate component are mixed and reacted.   The polyurethane foam panel according to claim 1, wherein the thickness direction of the polyurethane foam panel and the foaming direction of the cells in the foam are substantially perpendicular.   The polyurethane foam panel according to claim 1 or 2, comprising 10 to 80 parts by weight of the polyether polyol (A) and 10 to 60 parts by weight of the short glycol (B) in 100 parts by weight of the polyol compound. A method for producing a polyurethane foam panel obtained by using, as a raw material, a foamed stock solution composition containing a polyol compound, a polyol composition containing water as a foaming agent, and a polyisocyanate component,
The polyol compound has an average functional group number of 2 to 4, a weight average molecular weight of 3000 to 8000, a polyether polyol (A) which is a polymer of alkylene oxide, and a short glycol (B) having a molecular weight of less than 250 And containing
20 to 100 parts by weight of the water is contained with respect to 100 parts by weight of the polyol compound,
A method for producing a polyurethane foam panel, wherein an isocyanate index when mixing and reacting the polyol composition and the polyisocyanate component is 30 or less. An injection step of injecting the foaming stock solution composition with a side surface extending in the longitudinal direction and the thickness direction as a bottom surface for a mold having a longitudinal direction, a width direction, and a thickness direction;
A method for producing a polyurethane foam panel according to claim 4 , comprising a reaction step of reacting the foamed stock solution composition after the injection step. The polyurethane foam panel according to claim 4 or 5 , comprising 10 to 80 parts by weight of the polyether polyol (A) and 10 to 60 parts by weight of the short glycol (B) in 100 parts by weight of the polyol compound. Production method.