JP4104493B2 - Production method of polyurethane foam - Google Patents

Description

【００６１】
表１に示された結果から、各実施例によれば、高温状態であっても、ポリウレタンフォームからアミン系触媒に基づくVOC が発生する量を低減し、フォギングを発生させがたくするとともに、耐熱性が良好で、硬化性と成形性に優れたポリウレタンフォームを製造することができることがわかる。また、本来、VOC の発生量を低減させるために、イソシアネートと反応する官能基を分子内に有するアミン系触媒を使用してポリウレタンフォームを製造する場合、スコーチと称されている急激な反応熱の発生により、フォーム内部が黄色ないし褐色に変色し、いわゆる焼ける状態が生じやすくなるが、本発明の製造法によればスコーチを発生させずにポリウレタンフォームを製造することができる。
【００６２】
【発明の効果】
本発明によれば、高温状態であっても、ポリウレタンフォームからアミン系触媒に基づくVOC が発生する量を低減し、フォギングを発生させがたくするとともに、耐熱性が良好で、硬化性と成形性に優れたポリウレタンフォームを、スコーチを発生させずにポリウレタンフォームを製造することができるという効果が奏される。
【図面の簡単な説明】
【図１】 (a) は、本発明の各実施例又は各比較例で流動性を調べる際に用いられた流動性測定用型の概略説明図、(b) は前記流動性測定用型を用いて成形されたポリウレタンフォームの概略斜視図である。
【図２】図２は、本発明の各実施例又は各比較例で成形性を調べる際に用いられた成形性評価用型の概略説明図である。
【符号の説明】
１ 流動性測定用型
２ ポリウレタンフォーム
３ 成形性評価用型[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for producing a polyurethane foam. More specifically, it is suitable as an interior material for automobiles such as seat cushions, headrests, armrests, floor mats, instrument panels, dash silencers, cushioning materials such as bedding and furniture, heat insulating materials such as building materials, refrigerated warehouses, and bathtubs. The present invention relates to a method for producing a usable polyurethane foam.
[0002]
[Prior art]
Soft and semi-rigid polyurethane foams are used as automobile interior materials because they have moderate impact absorption, elasticity, compression recovery rate, sound absorption, and the like. In recent years, the reduction of volatile organic compounds (hereinafter referred to as VOC) typified by formaldehyde and toluene has been studied in consideration of the impact on the human body in enclosed spaces such as automobiles and houses. ing.
[0003]
Soft and semi-rigid polyurethane foams used as interior materials for automobiles are also subject to this VOC reduction. VOCs are mainly attributed to the use of amine-based catalysts during the production of polyurethane foams. There is a demand for a reduction in this.
[0004]
In general, the fogging phenomenon that occurs in automobile window glass called fogging that occurs when the temperature inside the automobile rises is due to amine-based catalysts such as triethylenediamine and bis (2-dimethylaminoethyl) ether. VOC is thought to be the cause. As a method for eliminating this fogging, a method has been proposed in which an amine-based catalyst itself is incorporated into the structure of a polyurethane foam using an amine-based catalyst having a functional group such as a hydroxyl group or amino group that reacts with isocyanate in the molecule ( For example, see Patent Document 1).
[0005]
Furthermore, there is a need for a polyurethane foam that reduces both the amount of VOCs generated from amine-based catalysts from polyurethane foam used in automobile interior materials and the like, and achieves both moldability and curability.
[0006]
[Patent Document 1]
Japanese Patent Laid-Open No. 2000-319435
[Problems to be solved by the invention]
The present invention reduces the amount of VOC based on amine-based catalysts from polyurethane foam even at high temperatures, makes fog less likely to occur, has good heat resistance, and has excellent curability and moldability. Another object of the present invention is to provide a method capable of producing a polyurethane foam without generating scorch.
[0008]
[Means for Solving the Problems]
The present invention relates to formula (I):
_{(CH 3) 2 N- (CH} 2) p -OH (I)
(Wherein p represents an integer of 4 to 9)
And a compound represented by formula (II):
_{(CH 3) 2 N- (CH} 2 CH 2 O) n -H (II)
(In the formula, n represents an integer of 2 to 4)
The present invention relates to a process for producing a polyurethane foam in which a polyol component and an isocyanate component are reacted in the presence of a catalyst containing a compound represented by formula (I) and a foaming agent.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
The present invention is characterized in that a catalyst containing a compound represented by the formula (I) and a compound represented by the formula (II) is used as the catalyst. The compound represented by the formula (I) and the compound represented by the formula (II) both have a hydroxyl group in the molecule, and have 4 or more carbon atoms between the nitrogen atom of the amino group and the hydroxyl group. An amine-based catalyst in which a group is present. In the present invention, by using these compounds in combination, the amount of VOC generated based on the amine catalyst can be greatly reduced, fogging can be suppressed, heat resistance is good, curability and An excellent effect that a polyurethane foam excellent in moldability can be obtained without generating scorch is exhibited.
[0010]
In the present specification, the term “scorch” means that the inside of the foam is changed from yellow to brown due to the generation of rapid reaction heat during the production of the polyurethane foam, and a so-called burning state occurs.
[0011]
The reason why such an excellent effect is manifested is not clear, but the catalyst containing the compound represented by the formula (I) and the compound represented by the formula (II) is an amino group nitrogen atom. Since a group having 4 or more carbon atoms exists between the hydroxyl group and the hydroxyl group in each compound is not easily affected by the nitrogen atom, it reacts efficiently with the isocyanate component, resulting in chemical reaction in the polyurethane foam. It is considered that the amount of VOC generated based on the amine catalyst is greatly reduced and fogging is suppressed by being almost taken in by bonding.
[0012]
In addition, since a hydroxyl group of these compounds reacts with an isocyanate component and a urethane bond formed by reacting with an isocyanate component and a nitrogen atom of an amino group, a group having 4 or more carbon atoms exists and is separated from the polyurethane foam. It is considered that the thermal degradation of is suppressed.
[0013]
Furthermore, when these compounds are used in combination, the balance between resinization and foaming of polyurethane foam is improved, so that both moldability and curability can be achieved, and the urethanization reaction is difficult to store heat. It is considered that the generation of scorch is suppressed because of the progress of the above.
[0014]
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.
[0015]
Specific examples of the compound represented by the formula (II) include 2- [2- (dimethylamino) ethoxy] ethanol, 2- [2- (2- (dimethylamino) ethoxy) ethoxy] ethanol, 2- [2 -(2- (2- (dimethylamino) ethoxy) ethoxy) ethoxy] ethanol and the like, and these compounds can be used alone or in admixture of two or more. Of these, 2- [2- (dimethylamino) ethoxy] ethanol and 2- [2- (2- (dimethylamino) ethoxy) ethoxy] ethanol are preferable from the viewpoint of catalytic activity and reactivity with the isocyanate component. 2- [2- (2- (dimethylamino) ethoxy) ethoxy] ethanol is more preferred.
[0016]
The weight ratio of the compound represented by the formula (I) and the compound represented by the formula (II) [compound represented by the formula (I) / compound represented by the formula (II)] is a molding of polyurethane foam. From the viewpoint of the property and curability, it is preferably 10/90 to 90/10, more preferably 20/80 to 80/20, still more preferably 30/70 to 80/20.
[0017]
The total weight of the compound represented by the formula (I) and the compound represented by the formula (II) is preferably based on 100 parts by weight of the polyol component from the viewpoint of enhancing the reactivity and maintaining the strength of the polyurethane foam. Is 0.1 to 7 parts by weight, more preferably 0.2 to 5 parts by weight, still more preferably 0.3 to 3 parts by weight.
[0018]
The catalyst contains a compound represented by the formula (I) and a compound represented by the formula (II), and comprises a compound represented by the formula (I) and a compound represented by the formula (II). It is preferable to be configured.
[0019]
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.
[0020]
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''-pentamethylcyethylenetriamine, 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, N- (3- Dimethylaminopropyl) -N-methylaminoethanol, N- (2-dimethylaminoethyl) -N-methylaminoethanol, 1-methylimidazole, 1-isobutyl-2-methylimidazole, 1,2-dimethylimidazole, etc. Examples thereof include 3-amine catalysts and derivatives thereof, salts of these with carboxylic acid, carbonic acid, and the like.
[0021]
As a polyol component, when manufacturing a polyurethane foam, what is conventionally used can be illustrated.
[0022]
Representative examples of the polyol component include polyester polyols, polyether polyols, polymer polyols, and phenol resin polyols described in “Polyurethane Resin Handbook” edited by Keiji Iwata (September 25, 1987, Nikkan Kogyo Shimbun). , Mannich polyol and the like, and these can be used alone or in admixture of two or more.
[0023]
Among the polyol components, polyether polyols, polymer polyols, polyester polyols and the like are preferable, and polyether polyols and polymer polyols are more preferable from the viewpoint of imparting a soft feel and appropriate elasticity.
[0024]
Typical examples of the polyether polyol include polyoxypropylene-based polyol (hereinafter referred to as PPG), polyoxytetramethylene glycol (hereinafter referred to as PTMG), and mixtures thereof. Of these, PPG having ethylene oxide added to the terminal is preferable. The PPG polyoxypropylene / polyoxyethylene ratio (weight ratio) is preferably 50/50 to 95/5, more preferably 60/40 to 80/20, from the viewpoints of hydrolyzability, reactivity and foam strength. It is.
[0025]
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 group-containing monomer and a polyether polyol, and polymerizing the polymerizable unsaturated group-containing monomer in the polyether polymer. By making it, it can manufacture by the method etc. which disperse | distribute the polymer fine particle obtained from the polymerizable unsaturated group containing monomer in 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. As the polymer fine particles, polystyrene, polyacrylonitrile and styrene-acrylonitrile copolymer are preferable.
[0026]
Examples of the polymerizable unsaturated group-containing monomer include alkyl (meth) acrylates having 1 to 4 carbon atoms in the alkyl group such as styrene; acrylotolyl; methyl (meth) acrylate, ethyl (meth) acrylate, butyl (meth) acrylate, and the like. These monomers can be used alone or in admixture of two or more.
[0027]
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.
[0028]
If necessary, additives such as a foam stabilizer, a communication agent, a crosslinking agent, a flame retardant, a stabilizer, 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.
[0029]
Although a foam stabilizer can be used as needed, what is necessary is just what is generally used when manufacturing a polyurethane foam.
[0030]
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.
[0031]
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. .
[0032]
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.
[0033]
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.
[0034]
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, uretoimine 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.
[0035]
Also, when manufacturing seat cushions, headrests, armrests, etc. for automobiles, among the isocyanate components, from the viewpoint of imparting moderate shock absorption and elasticity, tolylene diisocyanate, diphenylmethane diisocyanate and their urethane bonds, carbodiimide bonds, etc. A polyisocyanate-modified product containing at least one of the above is preferred.
[0036]
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.
[0037]
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 hydrocarbons such as isopentane, normal pentane and cyclopentane, gases such as nitrogen gas, air and carbon dioxide, HCFC-141b and HFC-134a , HFC-245fa, HFC-245ca, HFC-236ea, HFC-365mfc, HFE-347 and the like may be used.
[0038]
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.
[0039]
A polyurethane foam can be 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 a compound represented by the formula (II) and a blowing agent. . For example, the polyurethane foam is a mixture of a polyol component, a catalyst, a foaming agent, and an additive as necessary, and the resulting polyol mixture and an isocyanate component are mixed and stirred with a molding machine or the like, and injected into a mold. It can be manufactured by foaming. More specifically, the polyol mixture is mixed and stirred using a tank or the like, and is usually adjusted to a temperature of about 20 ° C., and then the isocyanate is obtained using a foaming machine such as an automatic mixing injection foaming machine or an automatic mixing type injection foaming machine. Examples include a method of reacting with components and foaming.
[0040]
The polyurethane foam of the present invention thus obtained reduces the amount of VOC generated based on the amine-based catalyst even in a high temperature state, hardly causes fogging, has good heat resistance, curability, moldability and scorch. It is excellent in suppression. Therefore, the polyurethane foam of the present invention can be suitably used as an automobile interior material, various cushion materials, various heat insulating materials and the like.
[0041]
【Example】
Examples 1-4 and Comparative Examples 1-5
80 parts by weight of polyol A [branched polyether polyol (average hydroxyl value: 28 mg KOH / g, manufactured by Sumika Bayer Urethane Co., Ltd., trade name: Sumifene 3063)], which is PPG having ethylene oxide added to the terminal. 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, triethanolamine 1.5 parts by weight, 3.5 parts by weight of water as a blowing agent , Foaming agent [silicone-based foaming agent (manufactured by Nippon Unicar Co., Ltd., trade name: L-3601)] 0.5 parts by weight, communication agent [cell opener (Sumika Bayer Urethane Co., Ltd., trade name: additive) J225)] 1.5 parts by weight, and a catalyst and additives having the composition shown in Table 1 were mixed with a lab mixer to obtain a polyol mixture.
[0042]
The resulting polyol mixture and the isocyanate component [manufactured by Sumika Bayer Urethane Co., Ltd., trade name: Sumidur 44V20] were mixed and stirred with a lab mixer at 15 ° C. so that the isocyanate index was 100, and the resulting mixture was obtained. 300 g was poured into a mold [inside dimension: 150 × 150 × 300 (height) mm] to mold a polyurethane foam free form.
[0043]
In addition, each abbreviation shown in Table 1 means the following.
(catalyst)
KL-25: 6-dimethylamino-1-hexanol (manufactured by Kao Corporation, trade name: Kao Raiser No. 25)
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]
TMAEEA: N, N, N'-trimethyl-N '-(2'-hydroxyethyl) -1,2-ethylenediamine
TMAPEA: N, N, N'-trimethyl-N '-(2'-hydroxyethyl) -1,3-propylenediamine
KL-31: Dipropylene glycol solution of 33% triethylenediamine (manufactured by Kao Corporation, trade name: Kao Raiser No. 31)
(Stabilizer)
PETP: Pentaerythrityl-tetrakis [3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate]
TPP: Triphenyl phosphite [0044]
Next, the physical properties of the obtained polyurethane foam were examined according to the following method. The results are also shown in Table 1.
[0045]
1. Strength retention The 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.
[0046]
2. After leaving the haze-molded free form for one day at room temperature, cut out a test piece (50mm x 50mm x 100mm) from the core and place it in a 500mL glass bottle containing 0.1mL of 2N hydrochloric acid. After sealing the opening with a transparent glass plate and immersing about two-thirds of this glass bottle in a hot water bath maintained at 80 ° C. for 100 hours, the haze value of the glass plate is measured with a haze meter (color difference meter). [Nippon Denshoku Industries Co., Ltd., product number: NDH-20D].
[0047]
The haze value is an index when VOC based on the amine catalyst is generated from the polyurethane foam, and the smaller the haze value, the lower the VOC and fogging at high temperatures.
[0048]
3. Free amine amount The free amine amount is an indicator of the amount of VOC generated from polyurethane foam based on amine catalysts.
[0049]
A test piece (50 mm x 50 mm x 50 mm) is cut out from the molded freeform, immersed in a 500 mL beaker containing 50 mL of ion-exchanged water, and the test piece is compressed 20 times with a push rod (surface area of 25 cm ² or more). The free amine catalyst was eluted in water.
[0050]
After removing the test piece from the beaker (at this time, sufficiently draining the water contained in the test piece and returning it to the beaker), weighed the amine-eluted water with a 25 mL hole pipette, put it in an Erlenmeyer flask, 0.01% Titrate with aqueous mol / L hydrochloric acid, correct the molecular weight of the catalyst from the titration of neutralization point, formula:
[Amount of free amine (mg / form 1L)] = [(50/25) / (0.5 x 0.5 x 0.5)] x 0.01 x titer (mL) x [molecular weight of catalyst]
The amount of free amine was determined according to
[0051]
4). Free-form core density After producing the free-form, leave it for one day, cut out a test piece of 100 mm x 100 mm x 100 mm from the core, measure the weight of the test piece, and divide it by its volume. Measured.
[0052]
5. Fluidity Fluidity is an indicator of moldability.
Figure 1 (a) Flowability measurement mold 1 (aluminum, 230mm width, 230mm height, 50mm depth inside a mold with a length of 180mm and a width of 50mm, each 50mm apart The temperature of the mold was adjusted to 60 ° C.
[0053]
Next, after casting 100 g of the mixture obtained in each example or each comparative example to the point A in the fluidity measurement mold 1, a lid is formed with a side plate (not shown), and molding is performed. After 6 minutes, the mold is removed to form the polyurethane foam 2 shown in FIG. 1 (b), and its length (the total length of a, b, c and d in FIG. 1 (b)) is measured. did.
In addition, it shows that fluidity | liquidity is so favorable that the length of a polyurethane foam is long, and it is excellent in the moldability.
[0054]
6). Moldability The mold temperature of a moldability evaluation mold 3 (aluminum, 500 mm × 500 mm × 50 mm) having the shape shown in FIG. 2 was adjusted to 60 ° C.
Next, after casting 600 g of the mixture obtained in each example or each comparative example at point B in the moldability evaluation mold 3, an upper lid (not shown) was formed, and molding was performed for 6 minutes. Later, the polyurethane foam was taken out and the end state was observed, and the moldability was evaluated based on the following evaluation criteria.
[0055]
〔Evaluation criteria〕
○: The polyurethane foam is clogged up to the mold end.
Δ: The polyurethane foam is clogged up to the mold end, but the end of the polyurethane foam is not finished cleanly.
X: There is a gap with the polyurethane foam at the mold end.
[0056]
7). Curability
A polyurethane foam was molded by reacting 60 g of the mixture obtained in each Example or each Comparative Example in a 300 mL polycup [trade name: Death Cup, manufactured by Terraoka Co., Ltd.]. The state of the polyurethane foam overflowed from the polycup was observed, and the curability was evaluated based on the following evaluation criteria.
[0057]
〔Evaluation criteria〕
A: The polyurethane foam overflowing from the polycup stands almost vertically.
○: The polyurethane foam overflowing from the polycup is slightly swollen and stands vertically.
X: The polyurethane foam which overflowed from the polycup is dripping on the side surface of the polycup.
[0058]
8). Scorch evaluation Although scorch often occurs during the formation of large slab foams, a simple scorch evaluation was performed by the following method.
The molded polyurethane foam free foam was removed after 6 minutes from casting of the mixture obtained in each example or comparative example, and immediately heated in a microwave for 2.5 minutes. Thereafter, the polyurethane foam was cut, the degree of coloring at the center of the foam was observed, and evaluation was performed based on the following evaluation criteria.
[0059]
〔Evaluation criteria〕
A: Coloration is not recognized at the center of the polyurethane foam.
○: Extremely light coloring is observed at the center of the polyurethane foam.
Δ: Pale brown coloration is observed at the center of the polyurethane foam.
X: A dark brown coloration is observed at the center of the polyurethane foam.
[0060]
[Table 1]

[0061]
From the results shown in Table 1, according to each example, the amount of VOC based on the amine-based catalyst is reduced from the polyurethane foam even at a high temperature, making it difficult to generate fogging and heat resistance. It can be seen that a polyurethane foam having good properties and excellent curability and moldability can be produced. In addition, in order to reduce the amount of VOC generated, when producing polyurethane foam using an amine-based catalyst that has a functional group that reacts with isocyanate in the molecule, the reaction heat of rapid reaction called scorch is reduced. Due to the occurrence, the inside of the foam turns yellow or brown, so that a so-called burning state is likely to occur. However, according to the production method of the present invention, polyurethane foam can be produced without generating scorch.
[0062]
【The invention's effect】
According to the present invention, even in a high temperature state, the amount of VOC generated from the polyurethane-based catalyst from polyurethane foam is reduced, fogging is less likely to occur, heat resistance is good, curability and moldability are reduced. The polyurethane foam can be produced without generating scorch from the excellent polyurethane foam.
[Brief description of the drawings]
FIG. 1 (a) is a schematic explanatory diagram of a fluidity measurement mold used in examining fluidity in each example or comparative example of the present invention, and (b) is a diagram illustrating the fluidity measurement mold. It is a schematic perspective view of the polyurethane foam shape | molded using.
FIG. 2 is a schematic explanatory view of a moldability evaluation die used for examining moldability in each example or comparative example of the present invention.
[Explanation of symbols]
1 Mold for fluidity measurement 2 Polyurethane foam 3 Mold for moldability evaluation

Claims (5)

Formula (I):
(CH ₃ ) ₂ N- (CH _{2 P} -OH (I)
(Wherein p represents an integer of 4 to 9)
And a compound represented by formula (II):
(CH ₃ ) ₂ N- (CH ₂ CH ₂ O) _n -H (II)
(In the formula, n represents an integer of 2 to 4)
In a catalyst containing a compound represented by, and in the presence of a blowing agent consisting of water, the preparation of polyurethane foams by reacting a polyol component and an isocyanate component.   The process according to claim 1, wherein the compound represented by the formula (I) is 6-dimethylamino-1-hexanol.   The process according to claim 1 or 2, wherein the compound represented by the formula (II) is 2- [2- (2- (dimethylamino) ethoxy) ethoxy] ethanol.   The weight ratio of the compound represented by the formula (I) and the compound represented by the formula (II) [the compound represented by the formula (I) / the compound represented by the formula (II)] is 10/90 to 90 The production method according to any one of claims 1 to 3, which is / 10.   The polyurethane foam obtained by the manufacturing method in any one of Claims 1-4.

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