JP2006160827A - Method for producing polyurethane foam for heating appliance - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a polyurethane foam which provides a heating appliance whose appearance is not spoiled even when it generates heat and is in elevated temperature conditions for a long time and which is friendly to health by reducing the volatilization amount of an amine catalyst from a polyurethane foam and using a polyurethane foam having good strength characteristics and small discoloration after elevated temperature heating. <P>SOLUTION: The method for producing a polyurethane foam for a heating appliance comprises reacting a polyol component with an isocyanate component in the presence of a catalyst and a foaming agent, wherein the catalyst contains a compound represented by formula (I): (CH<SB>3</SB>)<SB>2</SB>N(CH<SB>2</SB>)<SB>p</SB>OH (wherein p denotes an integer of 4-9) and/or a compound represented by the formula (II): (CH<SB>3</SB>)<SB>2</SB>N(CH<SB>2</SB>)<SB>q</SB>N[CH<SB>2</SB>CH(OH)CH<SB>3</SB>]<SB>2</SB>(wherein q denotes an integer of 3-6). The polyurethane foam for a heating appliance can be obtained by the production method. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a method for producing a polyurethane foam for a heating appliance. More specifically, the present invention relates to a method for producing a polyurethane foam for a heating appliance that can be suitably used as a component of a heating appliance such as an electric carpet or floor heating used in a residential space.

  Generally, it is proposed to use polyurethane foam as a constituent member for an electric carpet formed with a built-in heater, a heating device such as a floor heater, etc. because it is lightweight and has good cushioning properties and heat insulation properties ( For example, see Patent Documents 1 and 2).

However, since these polyurethane foams for heating appliances are used in residential spaces, when the heating appliances generate heat, the amine-based catalyst volatilizes from the polyurethane foam, and there is a concern about adverse effects on the human body.
Japanese Unexamined Patent Publication No. 7-80852 Japanese Patent Laid-Open No. 11-166033

  The present invention reduces the volatilization amount of the amine catalyst from the polyurethane foam, uses the polyurethane foam having good strength characteristics after heating at high temperature and little color change for the heating appliance, the heating appliance generates heat, and the It is an object of the present invention to provide a polyurethane foam that does not impair the appearance of a heater even in a high temperature state, and further provides a health-friendly heater.

That is, the gist of the present invention is as follows.
(1) Formula (I):
(CH ₃ ) ₂ N (CH ₂ ) _p OH (I)
(Wherein p represents an integer of 4 to 9)
And / or formula (II):
(CH ₃ ) ₂ N (CH ₂ ) _q N [CH ₂ CH (OH) CH ₃ ] ₂ (II)
(Wherein q represents an integer of 3 to 6)
A process for producing a polyurethane foam for a heating appliance, in which a polyol component and an isocyanate component are reacted in the presence of a catalyst containing a compound represented by
(2) polyurethane foam for heating appliances obtainable by the above production method,
(3) A polyurethane obtainable by reacting a polyol component with an isocyanate component in the presence of a compound represented by formula (I) and / or a catalyst containing a compound represented by formula (II) and a blowing agent A method of using the foam in a heater, and
(4) The present invention relates to a polyurethane foam catalyst for heating appliances comprising a compound represented by formula (I) and / or a compound represented by formula (II).

  The polyurethane foam of the present invention reduces the volatilization amount of the amine-based catalyst, has good strength characteristics after high-temperature heating and has little color change, and the heating appliance using the polyurethane foam generates heat, It has the effect of giving a health-friendly heating appliance without impairing the appearance of the heating appliance.

  In the present invention, a catalyst containing a compound represented by the formula (I) and / or a compound represented by the formula (II) as a catalyst used when producing a polyurethane foam as a component of a heating appliance There is a big feature in that is used. Both of the compound represented by the formula (I) and the compound represented by the formula (II) have a hydroxyl group that reacts with an isocyanate group in the catalyst molecule.

  As a result of intensive studies on an amine catalyst having a hydroxyl group or an amino group that reacts with an isocyanate group in the molecule, the present inventors have developed an amine catalyst having a hydroxyl group or an amino group that reacts with an isocyanate group in the molecule. Even so, due to its chemical structure, the reactivity with the isocyanate group of the isocyanate component that is the raw material compound of polyurethane foam, in other words, the ease of incorporation of the compound into the polyurethane foam, The degree of thermal deterioration of the formed urethane bond is different, and in order to reduce the volatilization amount based on the amine-based catalyst from the polyurethane foam and to further improve the heat resistance of the polyurethane foam, the selection of the catalyst is very important. I found out.

  In the compound represented by the formula (I), a group having 4 or more carbon atoms is interposed between the nitrogen atom of the amino group and the hydroxyl group. The compound represented by the formula (II) has two tertiary amino groups and two hydroxyl groups that are not N- (2-hydroxyethyl) amino group structures.

  In the present invention, when a polyurethane foam using a compound containing the compound represented by the formula (I) and / or the compound represented by the formula (II) is used as a component of a heating appliance, The amount of volatilization can be reduced, and even when the heater is heated to a high temperature for a long time, the color change of the polyurethane foam is small, and a heater having a good appearance can be obtained. An effect is produced.

The reason why such an excellent effect is expressed is not clear, but the compound represented by the formula (I) has a group having 4 or more carbon atoms between the nitrogen atom and the hydroxyl group of the amino group. Therefore, the reactivity of the hydroxyl group in the catalyst molecule is not easily affected by the nitrogen atom, so it reacts efficiently with the isocyanate component and is almost taken into the polyurethane foam by chemical bonding, and the hydroxyl group reacts with the isocyanate component. The urethane bond formed by the formula (III):
—NHCOO (CH ₂ ) _p N (CH ₃ ) ₂ (III)
(Wherein p is the same as above)
Since a group having 4 or more carbon atoms exists and is separated from the nitrogen atom of the amino group as in the group represented by formula (I), the compound represented by the formula (I) is almost scattered from the polyurethane foam. Further, it is considered that the thermal deterioration of the polyurethane foam is also suppressed.

  In addition, the compound represented by the formula (II) has two hydroxyl groups, and at least one hydroxyl group reacts with an isocyanate component, so that it is incorporated into the polyurethane foam by a chemical bond. Further, the urethane bond formed by the reaction of the hydroxyl group in the molecule with the isocyanate component without scattering is represented by the formula (IV):

(In the formula, q is the same as described above. R represents a —CH ₂ CH (CH ₃ ) OH group or a —CH ₂ CH (CH ₃ ) OCONH— group).
Although the number of carbon atoms between the nitrogen atom of the amino group is very close to 2 as in the group represented by the formula, the influence of the neighboring nitrogen atom is weakened by the effect of the branched methyl group, and the heat of the polyurethane foam It is considered that deterioration is suppressed.

  The compound represented by the formula (I) can be obtained by a condensation reaction of a corresponding alkylene diol and dimethylamine.

  Specific examples of the compound represented by the formula (I) include 4-dimethylamino-1-butanol, 6-dimethylamino-1-hexanol, 8-dimethylamino-1-octanol, 9-dimethylamino-1-nonanol. These compounds can be used alone or in admixture of two or more. Among these, 6-dimethylamino-1-hexanol is preferable from the viewpoint of catalytic activity and low odor.

  The compound represented by the formula (II) is an addition reaction of propylene oxide to the corresponding N, N-dimethylalkylenediamine. For example, in the formula (II), when q is 3, N, N-dimethyl It can be obtained by the addition reaction of propylene oxide to 1,3-propylenediamine.

    Specific examples of the compound represented by the formula (II) include N, N-dimethyl-N ′, N′-bis (2-hydroxypropyl) -1,3-propanediamine, N, N-dimethyl-N ′. , N′-bis (2-hydroxypropyl) -1,4-butanediamine, N, N-dimethyl-N ′, N′-bis (2-hydroxypropyl) -1,6-hexanediamine and the like, These compounds can be used alone or in admixture of two or more. Among these, N, N-dimethyl-N ′, N′-bis (2-hydroxypropyl) -1,3-propanediamine has catalytic activity and economy (ease of availability of raw materials and low cost). ) From the viewpoint.

  The catalyst contains a compound represented by the formula (I) and / or a compound represented by the formula (II), and is represented by the compound represented by the formula (I) and the formula (II). The combined use with a compound is preferable from the viewpoint of reducing the volatilization amount of the amine-based catalyst in view of productivity and the color change at high temperature exotherm.

    When the compound represented by formula (I) and the compound represented by formula (II) are used in combination, the weight ratio of the compound represented by formula (I) and the compound represented by formula (II) [formula The compound represented by (I) / the compound represented by formula (II)] is preferably 20/80 to 90/10 from the viewpoint of further expressing the superiority of the present invention in view of the productivity of polyurethane foam. More preferably, it is 30 / 70-80 / 20, More preferably, it is 40 / 60-80 / 20.

  As long as the object of the present invention is not hindered, other catalysts may be contained, and the content varies depending on the type and the type and density of the target polyurethane foam. Therefore, it is desirable to appropriately adjust depending on the type of these other catalysts.

  Examples of other catalysts include organometallic compounds represented by organotin catalysts such as tin dibutyldiacetate, tin dioctanoate and tin dibutyldilaurate; 1,4-diazabicyclo [2.2.2] octane, 2-methyl- 1,4-diazabicyclo [2.2.2] octane, N-methylmorpholine, N-ethylmorpholine, N- (dimethylaminoethyl) morpholine, N, N, N ', N'-tetramethylethylenediamine, N, N, N ', N'-tetramethylpropylenediamine, N, N, N', N'-tetramethylhexamethylenediamine, N, N-dimethylpiperazine, N, N ', N'-trimethylaminoethylpiperazine, tris (3- Dimethylaminopropyl) amine, N, N-dimethylcyclohexylamine, N, N-dimethylbenzylamine, N, N, N ', N' ', N' '-pentamethyldiethylenetriamine, bis (2-dimethylaminoethyl) ether , 1,8-Diazabicyclo [5.4.0] Undecene-7, N , N ', N' '-Tris (3-dimethylaminopropyl) hexahydro-s-triazine, 5-dimethylamino-3-methyl-1-pentanol, N, N-dimethylethanolamine, 2- (2-dimethyl Aminoethoxy) ethanol, 2- [2- (2-dimethylaminoethoxy) ethoxy] ethanol, N, N-dimethylisopropanolamine, N, N, N ', N' '-tetramethyl-N' '-(2- Hydroxypropyl) diethylenetriamine, N- [2- (2-dimethylaminoethoxy) ethyl] -N-methylaminoethanol, 1- [bis (3-dimethylaminopropyl) amino] -2-propanol, N- (3-dimethyl Aminopropyl) -N-methylaminoethanol, N- (2-dimethylaminoethyl) -N-methylaminoethanol, 1-methylimidazole, 1-isobutyl-2-methylimidazole, 1,2-dimethylimidazole, etc. Amine-based catalysts and these Derivatives, salts of these with carboxylic acid, carbonic acid and the like.

  The amount of the catalyst is preferably 0.1 to 7 parts by weight, more preferably 0.2 to 5 parts by weight, still more preferably 0.3 to 100 parts by weight of the polyol component, from the viewpoint of increasing reactivity and maintaining the strength of the polyurethane foam. ~ 3 parts by weight.

  As a polyol component, when manufacturing a polyurethane foam, what is conventionally used can be illustrated.

  Representative examples of the polyol component include, for example, polyester polyol, polyether polyol, polymer polyol, phenol described in “Polyurethane Resin Handbook” edited by Keiji Iwata (published on September 25, 1987, published by Nikkan Kogyo Shimbun). Examples thereof include resin-based polyols and Mannich polyols. These can be used alone or in admixture of two or more.

  Among the polyol components, polyester polyol, polyether polyol, polymer polyol and the like are preferable from the viewpoint of imparting a soft feel, and polyether polyol and polymer polyol are more preferable.

  Typical examples of the polyether polyol include polyoxypropylene polyol (hereinafter referred to as PPG), polyoxytetramethylene glycol (hereinafter referred to as PTMG), and a mixture thereof. Among these, PPG having ethylene oxide added to the terminal is preferable. The ratio (weight ratio) of polyoxypropylene / polyoxyethylene of PPG is preferably 50/50 to 95/5, more preferably 60/40 to 80 from the viewpoints of reactivity, foam hydrolyzability and foam strength. / 20.

  Typical examples of the polymer polyol include those in which polymer fine particles obtained by polymerizing a polymerizable unsaturated group-containing monomer are dispersed in a polyether polyol. This is, for example, a method of mixing and dispersing polymer fine particles obtained by polymerizing a polymerizable unsaturated-containing monomer and a polyether polyol, and polymerizing the polymerizable unsaturated group-containing monomer in the polyether polyol. Thus, it can be produced by a method of dispersing polymer fine particles obtained from the polymerizable unsaturated group-containing monomer in the polyether polyol. Among these methods, the latter method is preferable because a polymer polyol in which polymer fine particles are uniformly dispersed in the polyether polyol can be easily obtained.

  Examples of the polymerizable unsaturated group-containing monomer include styrene; acrylonitrile; alkyl (meth) acrylates having 1 to 4 carbon atoms in the alkyl group such as methyl (meth) acrylate, ethyl (meth) acrylate, and butyl (meth) acrylate. These monomers can be used alone or in admixture of two or more.

  The polymer polyol is not particularly limited as long as the polymer fine particles are dispersed in the polyether polyol. As the polymer fine particles, polystyrene, polyacrylonitrile and copolymers thereof are preferable.

  The average hydroxyl value of the polyol component is preferably 14 to 100 mgKOH / g, more preferably 17 to 75 mgKOH / g, and still more preferably 17 to 70 mgKOH / g, from the viewpoint of imparting viscosity and elasticity to the foam.

  In addition, it is preferable to use together PPG and a polymer polyol from a viewpoint of suppression of foam hydrolysis, improvement of foam strength, and imparting high elasticity. In this case, the ratio (weight ratio) of PPG and polymer polyol is preferably 60/40 to 95/5, more preferably 70/30 to 90/10, from the viewpoint of improving foam strength and imparting high elasticity. .

  If necessary, additives such as a foam stabilizer, a communication agent, a flame retardant, a stabilizer, a chain extender, a pigment, a filler, a viscosity reducer, a compatibilizing agent, and the like are appropriately added to the polyol component in an appropriate amount. May be.

  Although a foam stabilizer can be used as needed, what is necessary is just what is generally used when manufacturing a polyurethane foam.

  Representative examples of foam stabilizers include silicone surfactants such as dimethylpolysiloxane and polyoxyalkylene-modified dimethylpolysiloxane, anionic surfactants such as fatty acid salts, sulfate ester salts, phosphate ester salts, and sulfonates. These may be used alone or in admixture of two or more.

  Since the amount of the foam stabilizer varies depending on the type and the type and density of the target polyurethane foam and cannot be determined unconditionally, it is desirable to appropriately adjust according to the type of the foam stabilizer. .

  As the stabilizer, those generally used when producing polyurethane foam can be used as necessary. From the viewpoint of improving foam strength, triphenyl phosphite and pentaerythrityl-tetrakis [3- ( 3,5-di-t-butyl-4-hydroxyphenyl) propionate] can be suitably used, and it is particularly preferable to use these in combination.

  Since the amount of the stabilizer used varies depending on the type and the type and density of the target polyurethane foam and cannot be determined unconditionally, it is desirable to adjust appropriately according to the type of the stabilizer.

  Examples of the isocyanate component include aromatic polyisocyanates such as tolylene diisocyanate, diphenylmethane diisocyanate, polymethylene polyphenylene polyisocyanate, xylylene diisocyanate, and naphthylene diisocyanate; aliphatic polyisocyanates such as hexamethylene diisocyanate and lysine diisocyanate; hydrogenated diphenylmethane Aliphatic polyisocyanates such as diisocyanates, hydrogenated tolylene diisocyanates, isophorone diisocyanates; the above polys containing one or more of urethane bonds, carbodiimide bonds, uretimine bonds, allophanate bonds, urea bonds, burette bonds, isocyanurate bonds, etc. Isocyanate modified products, etc., these should be used alone or in admixture of two or more It can be.

  Among the isocyanate components, polyisocyanates containing one or more of tolylene diisocyanate, diphenylmethane diisocyanate and their urethane bonds, carbodiimide bonds, etc., from the viewpoint of imparting moderate shock absorption and elasticity as a polyurethane foam for heating appliances Denatured products are preferred.

  The amount of the isocyanate component varies depending on the required properties of the polyurethane foam and cannot be determined in general, but is usually adjusted so that the ratio (isocyanate index) of the polyol mixture and the isocyanate component described later is 30 to 110. Is preferable, 80 to 105 is more preferable, and 95 to 105 is more preferable.

  Water can be suitably used as the foaming agent. Other than water, as long as the object of the present invention is not hindered, low boiling point hydrocarbons such as isopentane, normal pentane and cyclopentane, gases such as nitrogen gas, air and carbon dioxide, HCFC-141b and HFC-134a Hydrochlorofluorocarbons such as HFC-245fa, HFC-245ca, HFC-236ea, HFC-365mfc, and HFE-347, hydrofluorocarbons, and hydrofluoroether foaming agents may be used.

  Since the amount of the foaming agent varies depending on the foam density of the target polyurethane foam and cannot be determined unconditionally, it is preferably adjusted as appropriate according to the target foam density.

  A polyurethane foam for heating appliances is produced by reacting a polyol component and an isocyanate component in the presence of a catalyst containing a compound represented by the formula (I) and / or a compound represented by the formula (II) and a blowing agent. Can be manufactured. Polyurethane foam for heating appliances, for example, a polyol component, a catalyst, a foaming agent and additives as necessary are mixed, and the resulting polyol mixture and the isocyanate component are mixed and stirred with a molding machine or the like, It can be manufactured by pouring and foaming. More specifically, for example, a flat mold (for example, inner dimension: 1000 mm × 1000 mm × thickness 5 mm) 1 shown in FIG. 1A is prepared, and the AA of FIG. As shown in FIG. 1 (b), which is a cross-sectional view at the section, a cover material in which a tubing heater 4 is bonded to a fabric 3 coated with a polyethylene sheet 2 is installed, and the mold temperature of the flat mold 1 is increased to 50 ° C. Adjust. Then, after mixing and injecting a polyol mixture and an isocyanate component, it caps with an upper cover (not shown), it shape | molds, and it can demold after 5 minutes, and can obtain the polyurethane foam molded article 5. .

  The amount of color change when the polyurethane foam for heating appliances of the present invention thus obtained is heated in air at a temperature of 120 ° C. for 24 hours is from the viewpoint of maintaining the strength characteristics after high temperature heating and maintaining the appearance of the heating appliance. It is desirable that the yellow index is 40 or less, preferably 35 or less. In addition, the amount of color change is a value when measured by the measurement method described in Examples described later.

  In addition, the amount of volatile amine at 120 ° C. of the polyurethane foam for heating appliances of the present invention is 0.1 mg or less, preferably 0.05 mg or less, more preferably 0.03 mg or less, per 1 g of foam from the viewpoint of avoiding adverse effects on the human body. It is desirable to be. In addition, the amount of volatile amine is a value when it measures by the measuring method as described in the Example mentioned later.

Examples 1-4 and Comparative Examples 1-4
As a polyol component, 80 parts by weight of a branched polyether polyol [average hydroxyl value: 35 mgKOH / g, manufactured by Sumika Bayer Urethane Co., Ltd., trade name: Sumifene 3900], which is PPG having ethylene oxide added to the terminal, and PPG type Polymer polyol [average hydroxyl value: 28 mgKOH / g, manufactured by Sanyo Chemical Industries, Ltd., trade name: Sannix FA-728R] 20 parts by weight, chain extender (triethanolamine) 1.5 parts by weight, foaming agent (water) 2.0 Part of a foam stabilizer (silicone foam stabilizer, Nippon Unicar Co., Ltd., trade name: L-5309) and a catalyst having the composition shown in Table 1 were mixed with a lab mixer to obtain a polyol mixture.

The details of the catalyst used are as follows.
(Details of the catalyst used)
・ KL-25: 6-dimethylamino-1-hexanol, manufactured by Kao Corporation, trade name: Kao Raiser No.25
・ DMAPO: N, N-dimethyl-N ′, N′-bis (2-hydroxypropyl) -1,3-propanediamine ・ KL-23NP: 2- [2- [2- (dimethylamino) ethoxy] ethoxy] Ethanol, manufactured by Kao Corporation, trade name: Kao Riser No.23NP
・ KL-26: 2- [2- (Dimethylamino) ethoxy] ethanol, manufactured by Kao Corporation, trade name: Kao Raiser No.26
・ TMAPEA: N, N, N′-trimethyl-N ′-(2′-hydroxyethyl) -1,3-propanediamine ・ KL-31: 33% triethylenediamine in dipropylene glycol solution, manufactured by Kao Corporation Product Name: Kao Raiser No.31
・ KL-12: Dipropylene glycol solution of 70% bis (2-dimethylaminoethyl) ether, manufactured by Kao Corporation, trade name: Kao Raiser No.12

  The resulting polyol mixture and the isocyanate component (manufactured by Sumika Bayer Urethane Co., Ltd., trade name: Sumidur 0581) were mixed and stirred with a lab mixer at 20 ° C. so that the isocyanate index was 100, and the resulting mixture was obtained. 400 g was poured into a mold [inside dimension: 150 × 150 × 300 (height) mm] to mold a polyurethane foam free form.

  Next, the physical properties of the obtained polyurethane foam were examined according to the following method. The results are also shown in Table 1.

1.Reactivity
The time required to reach cream time (CT), gel time (GT) and rise time (RT) in free foaming of 60 g of a mixture of a polyol mixture and an isocyanate component stirred in a 300 mL polycup was measured.
This shows that the shorter the reaction time, the faster the foaming and curing.

2. Foam core density After producing the free foam, leave it for one day, cut out a test piece of 100mm x 100mm x 100mm from the core, measure the weight of the test piece, and divide it by its volume. And measured.

3. Strength retention strength retention is an index of heat resistance.
After the molded freeform is allowed to stand at room temperature for 24 hours, 10 test pieces for tensile test measurement of type 2 are cut out from the freeform in accordance with JIS K 6301, and 5 of them are pulled at room temperature. Average strength (initial strength) when the tensile test was performed at a pulling speed of 125 mm / min using a tester [Autograph manufactured by Shimadzu Corporation, product number: DCS-50M], and the remaining five test pieces The average value of the strength (strength at high temperature) when measured in the same manner as described above after being left in an atmosphere at 120 ° C. for 24 hours is calculated using the formula:
[Strength retention (%)] = [High-temperature strength] ÷ [Initial strength] x 100
Sought according to.

4. Color change amount A test piece (50 mm x 50 mm x 20 mm) was cut out from the molded free-form core, and the yellow index YI was measured with a color difference meter [Konica Minolta Sensing Co., Ltd., product number: CR-400]. .
Next, after this test piece was left in air at 120 ° C. for 24 hours, the yellow index YI ′ was measured in the same manner as described above, and the amount of color change when heated at high temperature was expressed by
ΔYI (color change) = YI '-YI
Sought according to.

5. Amount of Volatile Amine 0.01 g of a test piece was cut out from the molded free form, and the volatilization amount of the amine catalyst was quantified by headspace gas chromatography (Hewlett-Packard Development Company, LP, product number: HP6890).
In the pretreatment of the head space part, the test piece was heated with a sand heater at a temperature of 120 ° C. for 30 minutes, and the volatile component was introduced into the column for gas chromatography. An attached mass spectrometer was used for identification of the amine catalyst.

  From the results shown in Table 1, it can be seen that the polyurethane foam obtained in each example has a small amount of color change and a very small amount of volatile amine while maintaining excellent strength.

  In Example 3, since the compound represented by the formula (I) and the compound represented by the formula (II) are used in combination as the catalyst, the CT is higher than that of the single catalyst (Examples 1 and 2). Is comparatively long, so that it is excellent in moldability, and GT is comparatively short.

  The polyurethane foam for a heating appliance obtained by the production method of the present invention is useful as a component of a heating appliance such as an electric carpet and floor heating used in a residential space.

(A) is a schematic explanatory drawing which shows one embodiment at the time of manufacture of the polyurethane foam for heating appliances of this invention, (b) is a schematic sectional drawing in the AA part of Fig.1 (a).

Explanation of symbols

1 Plane mold 2 Polyethylene sheet 3 Fabric 4 Tubing heater 5 Polyurethane foam molded product

Claims (6)

Formula (I):
(CH ₃ ) ₂ N (CH ₂ ) _p OH (I)
(Wherein p represents an integer of 4 to 9)
And / or formula (II):
(CH ₃ ) ₂ N (CH ₂ ) _q N [CH ₂ CH (OH) CH ₃ ] ₂ (II)
(Wherein q represents an integer of 3 to 6)
The manufacturing method of the polyurethane foam for heating appliances which makes a polyol component and an isocyanate component react in presence of the catalyst containing the compound represented by these, and a foaming agent.   The polyurethane foam for heating appliances according to claim 1, wherein the amount of color change when heated in air at 120 ° C for 24 hours is 40 or less in terms of yellow index, and the amount of volatile amine at 120 ° C is 0.1 mg or less per 1 g of foam. Manufacturing method.   The process according to claim 1 or 2, wherein the compound represented by the formula (I) is 6-dimethylamino-1-hexanol.   The polyurethane foam for heating appliances which can be obtained by the manufacturing method in any one of Claims 1-3. Formula (I):
(CH ₃ ) ₂ N (CH ₂ ) _p OH (I)
(Wherein p represents an integer of 4 to 9)
And / or formula (II):
(CH ₃ ) ₂ N (CH ₂ ) _q N [CH ₂ CH (OH) CH ₃ ] ₂ (II)
(Wherein q represents an integer of 3 to 6)
The method of using the polyurethane foam which can be obtained by making a polyol component and an isocyanate component react in presence of the catalyst containing the compound represented by these, and a foaming agent for a heating appliance. Formula (I):
(CH ₃ ) ₂ N (CH ₂ ) _p OH (I)
(Wherein p represents an integer of 4 to 9)
And / or formula (II):
(CH ₃ ) ₂ N (CH ₂ ) _q N [CH ₂ CH (OH) CH ₃ ] ₂ (II)
(Wherein q represents an integer of 3 to 6)
A catalyst for polyurethane foam for heating appliances, comprising a compound represented by:

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