JP2020015808A - Polyurethane foam and manufacturing method therefor - Google Patents

Abstract

To provide a mold polyurethane foam high in heat conductivity, capable of enhancing air-conditioning efficiency in vehicle room when used in an interior material for vehicle, and capable of contributing to energy conservation.SOLUTION: There is provided a polyurethane foam capable of being obtained by foaming a composition for polyurethane foam containing polyol, a foaming agent, a catalyst, a foam stabilizer, and isocyanate in a mold, containing low EO polyether polyol having addition rate of ethylene oxide of 1 to 25 wt.% and polymer polyol as the polyol, in which the foam stabilizer is a silicone-based foam stabilizer having viscosity of 1000 mPa s (25°C) or more, and surface tension of 26 mN/m or less.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a polyurethane foam and a method for producing the same.

2. Description of the Related Art Conventionally, polyurethane foam is generally used as a heat insulating material that makes it difficult to conduct heat as a foam, and molded polyurethane foam is used as a vehicle interior material such as a seat cushion, a headrest or an armrest.
Molded polyurethane foam is produced from a composition for polyurethane foam by a mold foaming method.

  The mold foaming method is a method for producing a polyurethane foam by injecting a polyurethane foam composition containing a polyol, a foaming agent, a catalyst, and an isocyanate into a mold and foaming the mixture by reacting the polyol with the isocyanate. In the mold foaming method, since a polyurethane foam having a product shape is obtained by foaming, there is an advantage that post-processing can be reduced.

  By the way, in an automobile, the temperature inside the cabin is controlled by the operation of a car air conditioner. However, to save energy, it is required to increase the cooling / heating efficiency of the cabin.

  However, the molded polyurethane foam used for interior materials for vehicles has a low thermal conductivity, so that heat tends to be trapped therein, and a large amount of energy is required to keep the interior of the vehicle at an appropriate temperature.

Japanese Patent Publication No. Hei 6-22918

  The present invention has been made in view of the above points, and has a high thermal conductivity, and when used as an interior material for a vehicle, can increase the cooling and heating efficiency of a vehicle interior, and can contribute to energy saving. The purpose is to provide a foam and its manufacturing method.

  The invention of claim 1 is a mold polyurethane foam obtained from a polyurethane foam composition containing a polyol, a foaming agent, a catalyst, a foam stabilizer, and an isocyanate, wherein the polyol has an ethylene oxide addition rate of 1 to 25% by weight. A foam stabilizer comprising a low EO polyether polyol and a polymer polyol, wherein the foam stabilizer is a silicone-based foam stabilizer having a viscosity of 1000 mPa · s (25 ° C.) or more and a surface tension of 26 mN / m (25 ° C.) or less. And

  The invention according to claim 2 is the method according to claim 1, wherein when the total polyol amount is 100 parts by weight, the low EO polyether polyol is 30 to 80 parts by weight, and the silicone-based foam stabilizer is linear. It is characterized by being silicone.

  The invention of claim 3 is characterized in that, in claim 1 or 2, the isocyanate is an MDI-based isocyanate alone or a combination of an MDI-based isocyanate and TDI.

  A fourth aspect of the present invention is characterized in that, in any one of the first to third aspects of the present invention, the catalyst includes two types of a foaming catalyst and a resinification catalyst.

  The invention of claim 5 is the high EO polyolefin according to any one of claims 1 to 4, wherein, as the polyol, the addition ratio of ethylene oxide is 70 to 100% by weight together with the low EO polyether polyol and the polymer polyol. It is characterized by containing an ether polyol.

  According to a sixth aspect of the present invention, in any one of the first to fifth aspects, the composition for a polyurethane foam contains a crosslinking agent.

According to a seventh aspect of the present invention, in any one of the first to sixth aspects, the molded polyurethane foam has a density of 30 to 70 kg / m ³ , a number of cells of 4 to 30 cells / 25 mm, and a thermal conductivity of 0. 039 to 0.050 W / m · K.

  The invention according to claim 8 is a method for producing a molded polyurethane foam in which a polyurethane foam composition containing a polyol, a foaming agent, a catalyst, a foam stabilizer, and an isocyanate is injected into a mold and foamed, wherein ethylene oxide is used as the polyol. EO polyether polyol having an addition rate of 1 to 25% by weight, and a polymer polyol, wherein the foam stabilizer has a viscosity of 1000 mPa · s (25 ° C.) or more and a surface tension of 26 mN / m (25 ° C.) or less. It is a silicone-based foam stabilizer.

  In a ninth aspect of the present invention, in the eighth aspect, when the total polyol amount is 100 parts by weight, the low EO polyether polyol is 30 to 80 parts by weight, and the silicone-based foam stabilizer is linear. It is characterized by being silicone.

  According to the present invention, a molded polyurethane foam having a high thermal conductivity can be obtained, and when the molded polyurethane foam of the present invention is used for an interior material for a vehicle, the cooling and heating efficiency of the vehicle interior can be increased, contributing to energy saving. can do.

It is sectional drawing of an example of the molded polyurethane foam of this invention. It is sectional drawing which shows the time of manufacture of a mold polyurethane foam. It is a table | surface which shows the combination of the composition for polyurethane foams of an Example and a comparative example, and the measurement result of physical properties.

  An embodiment of the present invention will be described. The molded polyurethane foam 10 of one embodiment of the present invention shown in FIG. 1 is used as a vehicle seat cushion, and is obtained from a polyurethane foam composition.

The composition for a polyurethane foam contains a polyol, a foaming agent, a catalyst, a foam stabilizer, and an isocyanate.
The polyol includes a low EO polyether polyol and a polymer polyol, and more preferably further includes a high EO polyether polyol.

The low EO polyether polyol has an addition ratio of ethylene oxide (EO) of 1 to 25% by weight, and more preferably 5 to 20% by weight. The low EO polyether polyol preferably has 1 to 4 functional groups and a molecular weight (number average) of 3000 to 8000.
The addition rate (% by weight) of ethylene oxide (EO) is defined as the ratio of ethylene oxide (EO) to the total amount of alkylene oxide (AO) such as ethylene oxide (EO) or propylene oxide (PO), which is a monomer at the time of producing the polyether polyol. EO), and is a value calculated by EO weight × 100 / AO total amount (EO weight + PO weight, etc.).

  The polymer polyol is a polyol in which polyacrylonitrile or polystyrene is dispersed in a polyol. The polymer polyol preferably has an ethylene oxide (EO) addition rate of 1 to 25% by weight, a functional group number of 1 to 4, and a molecular weight (number average) of 3000 to 8000. A more preferable addition rate of ethylene oxide (EO) is 5 to 20% by weight.

  The high EO polyether polyol has an addition ratio of ethylene oxide (EO) of 70 to 100% by weight, and more preferably 75 to 100% by weight. The high EO polyether polyol preferably has 1 to 4 functional groups and a molecular weight (number average) of 300 to 7000, and more preferably 2 to 4 functional groups and a molecular weight (number average) of 1000 to 6000.

The low EO polyether polyol, the polymer polyol, and the high EO polyether polyol are not limited to one type, and a plurality of types may be used.
By using a low EO polyether polyol and a polymer polyol in combination, a polyurethane foam having a hardness suitable for a seat cushion can be obtained. Further, by containing the high EO polyether polyol, individual cells constituting the polyurethane foam can be made more cell-open (cell-opening property), and the air permeability of the polyurethane foam can be improved.
The amount of each polyol is 30 to 80 parts by weight of the low EO polyether polyol and 15 to 60 parts by weight of the polymer polyol when the total of the low EO polyether polyol, the polymer polyol and the high EO polyether polyol is 100 parts by weight. And the high EO polyether polyol is preferably 0 to 20 parts by weight. More preferably, the amount of each polyol is 40 to 75 parts by weight of the low EO polyether polyol, when the total of the low EO polyether polyol, the polymer polyol, and the high EO polyether polyol is 100 parts by weight. The polyol is preferably 20 to 50 parts by weight, and the high EO polyether polyol is preferably 0 to 15 parts by weight.

  As the blowing agent, water, a hydrocarbon such as chlorofluorocarbon or pentane can be used alone or in combination, and water is particularly preferable. In the case of water, carbon dioxide gas is generated during the reaction between the polyol and the isocyanate, and the carbon dioxide gas causes foaming. The amount of water as a foaming agent is preferably 1.0 to 4.0 parts by weight based on 100 parts by weight of the polyol.

  As the catalyst, a known catalyst for polyurethane foam can be used. In the present invention, a combination of a foaming catalyst and a resinification catalyst is preferred. The foaming catalyst is a catalyst that promotes a reaction between polyisocyanate and water to generate carbon dioxide gas. The foaming catalyst is not limited. For example, triethylamine, dimethylaminoethoxyethanol, N, N, N'-trimethylaminoethyl-ethanolamine, N, N, N ', N ", N" -pentamethyldiethylenetriamine And amine catalysts such as bis (2-dimethylaminoethyl) ether.

The resinification catalyst is a catalyst that promotes a urethanization reaction (resinization reaction) between a polyol and an isocyanate. The catalyst for resinification is not limited. For example, 1,2-dimethylimidazole, N. (N ′, N′-dimethylaminoethyl) -morpholine, tetramethylguanidine, dimethylaminoethanol, triethylenediamine, N-methyl -N '-(2hydroxyethyl) -piperazine, N, N, N', N'-tetramethylpropane 1,3-diamine, N, N'-dimethylpiperazine, N, N, N ', N'-tetra Methylhexane-1,6-diamine, N, N, N ', N ", N" -pentamethyldipropylene-triamine, N- (2-hydroxyethyl) morpholine, ethylene glycol bis (3-dimethyl) -aminopropyl Ether, N, N-dimethylcyclohexylamine, N-methyl-N ′-(2dimethylamino) ethylpiperazine, etc. It may be mentioned amine-based catalyst.

  By using both the foaming catalyst and the resin-forming catalyst, both the moldability and the cell openness (air permeability) of the molded polyurethane foam can be improved. The total amount of the catalyst is preferably from 0.3 to 3.0 parts by weight based on 100 parts by weight of the polyol.

  The foam stabilizer has a viscosity based on JIS K1557-5 of 1,000 mPa · s (25 ° C.) or more, preferably 1200 to 10000 mPa · s (25 ° C.), and a surface tension (25 ° C.) based on the Wilhelmy method of 26 mN. / M or less, preferably 18 to 24 mN / m, of a silicone-based foam stabilizer for flexible polyurethane foam or mold foam. When the viscosity of the foam stabilizer is less than 1000 mPa · s (25 ° C.), the cells become finer, the number of cells increases, and the thermal conductivity deteriorates. On the other hand, when the surface tension exceeds 26 mN / m, the foam-regulating power becomes weak, and it becomes difficult to hold the foam. As the silicone-based foam stabilizer, linear silicone ((AB) n-type) is preferable. Examples of usable foam stabilizers include “L-6164” and “L-629” manufactured by Momentive. "L-6164" is a linear silicone having a viscosity of 4840 mPa · s (25 ° C) and a surface tension of 22.7 mN / m (25 ° C). "L-629" is a linear silicone having a viscosity of 1560 mPa · s (25 ° C) and a surface tension of 20.6 mN / m (25 ° C). The foam stabilizer is not limited to one type, and two or more types may be used in combination. If the amount of the foam stabilizer is too small, it becomes difficult to retain the foam during foaming, or the initial compressibility when seated is hard and the cushion feeling is poor. Conversely, if the amount is too large, the cells become finer, the air permeability deteriorates, and the cushioning property tends to worsen. It is 4 to 1.8 parts by weight.

  As the isocyanate, an aliphatic or aromatic polyisocyanate having two or more isocyanate groups, a mixture thereof, and a modified polyisocyanate obtained by modifying them can be used. Examples of the aliphatic polyisocyanate include hexamethylene diisocyanate, isophorone diisocyanate, and dicyclohexamethane diisocyanate. Examples of the aromatic polyisocyanate include toluene diisocyanate (TDI), diphenylmethane diisocyanate (MDI), naphthalene diisocyanate, and xylylene diisocyanate. Examples thereof include range isocyanate and polymeric polyisocyanate (crude MDI). In addition, prepolymers modified from these can also be used.

  In the present invention, as the isocyanate, MDI isocyanate alone or a combination of MDI isocyanate and TDI is particularly preferable. The MDI-based isocyanate refers to diphenylmethane diisocyanate (MDI) alone, polymeric polyisocyanate (crude MDI) alone, a mixture thereof, or a prepolymer type thereof. When the MDI-based isocyanate and the toluene diisocyanate (TDI) are used in combination, it is preferable that the ratio of the MDI-based isocyanate is 10% or more.

  The isocyanate index is preferably from 80 to 120, and more preferably from 85 to 105. The isocyanate index is a value obtained by multiplying a value obtained by dividing the number of moles of isocyanate groups in the isocyanate by the total number of moles of active hydrogen groups such as hydroxyl groups of the polyol by 100, and [NCO equivalent of isocyanate / active hydrogen equivalent × 100]. Is calculated.

  Other additives that are appropriately compounded include, for example, a crosslinking agent, a flame retardant, and a coloring agent.

  The crosslinking agent is blended to adjust the hardness of the molded polyurethane foam. Examples of the crosslinking agent include polyhydric alcohols such as glycerin, 1,4-butanediol, and diethylene glycol, and amines such as ethanolamines and polyethylene polyamines. Two or more crosslinking agents may be used. When a crosslinking agent is blended, the amount of the crosslinking agent is preferably 0.1 to 4 parts by weight based on 100 parts by weight of the polyol. The crosslinking agent is not limited to one type, and two or more types may be used.

The flame retardant is blended to reduce the burning of the polyurethane foam. Examples of the flame retardant include known liquid flame retardants and solid flame retardants. For example, halogenated polymers such as polyvinyl chloride, chloroprene rubber, chlorinated polyethylene, phosphate esters and halogenated phosphate compounds, or organic flame retardants such as melamine resins and urea resins, and antimony oxide and aluminum hydroxide Examples include inorganic flame retardants. When blending a flame retardant, the amount of the flame retardant is preferably 0.1 to 5 parts by weight based on 100 parts by weight of the polyol. The flame retardant is not limited to one type, and two or more types may be used in combination.
The coloring agent is blended to give the polyurethane foam an appropriate color, and a colorant corresponding to the required color is used. Examples of the coloring agent include pigments and graphite.

The molded polyurethane foam 10 obtained from the polyurethane foam composition has a density (JIS K7222: 2005) of 30 to 70 kg / m ³ , and is suitable for vehicle interior materials because of its light weight.

The molded polyurethane foam 10 obtained from the composition for a polyurethane foam has a cell number ( JIS K 6400) of 4 to 30 cells / 25 mm, and a thermal conductivity (JIS A 1412-2: heat flow meter method) at room temperature of 0.039. ０．０0.050 W / m · K, high thermal conductivity and good thermal conductivity. When used for interior materials for vehicles, the efficiency of cooling and heating in the cabin can be increased, contributing to energy saving. be able to.

A method for producing a molded polyurethane foam 10 obtained from the composition for a polyurethane foam will be described.
First, as shown in FIG. 2 (2 -A), the polyurethane foam composition P is injected into the mold 20 by the injection nozzle N. The mold 20 includes a lower mold 21 and an upper mold 22, and has a mold inner surface having a shape equal to the outer shape of the molded polyurethane foam to be manufactured.

  Next, the mold 20 is closed as shown in (2-B) of FIG. 2 to foam the composition P for polyurethane foam, and filled in the mold 20 as shown in (2-C) of FIG. Thereby, the molded polyurethane foam 10 is foamed, and then the molded polyurethane foam 10 is taken out of the mold 20.

  In the illustrated example, an example of open mold foaming in which the composition P for polyurethane foam is injected with the mold 20 opened and the mold 20 is closed after the injection is shown, but the mold is closed with the mold closed. Closed mold foaming, in which a composition for polyurethane foam is injected from a hole provided in a mold, may be used.

  It is preferable that the pack ratio (filling ratio) at the time of injecting the polyurethane foam composition into a mold is 100 to 200%, more preferably 105 to 150%. The pack ratio (filling ratio) is calculated by (density during mold foaming / density during free foaming) × 100.

  Using the following components, the compositions for polyurethane foam prepared according to the formulations of Examples and Comparative Examples shown in FIG. 3 were mixed and injected into a mold to produce a molded polyurethane foam. The inner surface shape and dimensions of the mold were 20 × 20 × 8 cm rectangular parallelepiped, and the packing ratio was 105%. The amounts of the components in FIG. 3 are parts by weight.

Polyether polyol A1: EO addition rate = 80% by weight, polyoxyalkylene polyol, molecular weight = 4000, number of functional groups = 3, OHV = 39 mgKOH / g
-Polyether polyol A2-1: EO addition rate = 15% by weight, polyoxyalkylene polyol, molecular weight = 5000, number of functional groups = 3, OHV = 33 mgKOH / g
-Polyether polyol A2-2: EO addition rate = 15% by weight, polyoxyalkylene polyol, molecular weight = 7000, number of functional groups = 3, OHV = 24 mgKOH / g
-Polyether polyol A3: EO addition rate = 15 wt%, polyoxyalkylene polyol, molecular weight = 5000, number of functional groups = 3, OHV = 28 mgKOH / g, polymer polyol (polymer content 20 wt%)
-Polyether polyol A4: EO addition ratio = 0% by weight, polyoxypropylene polyol, molecular weight = 1000, number of functional groups = 2, OHV = 112 mgKOH / g

  ・ Crosslinking agent-1: glycerin, molecular weight = 92, number of functional groups = 3 ・ Crosslinking agent-2: diethanolamine, molecular weight = 105, number of functional groups = 2 ・ Crosslinking agent-3: polyether-based crosslinking agent, molecular weight = 190, number of functional groups = 3

  ・ Catalyst-1: Foaming catalyst, bis (2-dimethylaminoethyl) ether, product number; BL-19, manufactured by Air Products Japan ・ Catalyst-2: Resinification catalyst, 33% dipropylene glycol solution of triethylenediamine, product number ; DABCO-33-LV, manufactured by Air Products Japan

・ Foam stabilizer-1: Linear silicone-based foam stabilizer, viscosity = 4840 mPa · s (25 ° C.), surface tension = 22.7 mN / m (25 ° C.), product number: L-6164, manufactured by MOMENTIVE Inc. Foaming agent-2: Linear silicone foam stabilizer, viscosity 1560 mPa · s (25 ° C.), surface tension 20.6 mN / m (25 ° C.), product number: L-629, manufactured by Momentive, Inc. : Silicone foam stabilizer, viscosity 40 mPa · s (25 ° C), surface tension 20.9 mN / m (25 ° C), product number: B-8736LF, manufactured by Evonik Japan K.K. ・ Foam stabilizer-4: dimethylsiloxane Copolymer, viscosity = 610 mPa · s (25 ° C.), surface tension = 20.8 mN / m (25 ° C.), product number: L-3184J, manufactured by MOMENTIVE

Isocyanate-1: a mixture of 80% of a 80:20 mixture of 2,4-toluene diisocyanate (TDI) and 2,6-toluene diisocyanate (TDI) and 20% of polymeric polyisocyanate (crude MDI), product number; TM -20, manufactured by Mitsui Chemicals, Inc. ・ Isocyanate-2: modified 4,4′-diphenylmethane diisocyanate, product name: Coronate 1050, manufactured by Nippon Polyurethane Industry Co., Ltd.

  For the obtained Examples 1 to 5 and Comparative Examples 1 to 5, the density (JIS K7222: 2005), the number of cells (JIS K 6400), the thermal conductivity (JIS A 1412-2: heat flow meter method), The air permeability (JIS L1096: Frazier method A, thickness 15 mm) and rebound (JIS K 6400) were measured. FIG. 3 shows the measurement results.

In Example 1, a polyether polyol A1 having an EO addition ratio of 80% by weight, a molecular weight of 4000, and a functional group number of 3 was 5 parts by weight, an EO addition rate of 15% by weight, a molecular weight of 5,000, and a functional group number of 3 as a polyol. 35 parts by weight, 40 parts by weight of a polyether polyol A2-2 having an EO addition rate of 15% by weight, a molecular weight of 7,000, and 3 functional groups, and a polyether comprising a polymer polyol having an EO addition rate of 15% by weight, a molecular weight of 5000, and 3 functional groups 20 parts by weight of polyol A3, 1.2 parts by weight of crosslinking agent-1, 1.1 parts by weight of crosslinking agent-2, 3.6 parts by weight of water as a blowing agent, catalyst-1 (foaming catalyst) , 0.05-2 parts by weight of catalyst-2 (resin-forming catalyst), foam stabilizer-2 (linear silicone foam stabilizer, viscosity 1560 mPa · s (25 ° C.), surface tension) 0.6mN / m (25 ℃)) and 1.5 parts by weight, is an example produced from polyurethane foam composition comprising an isocyanate 1 from 42.9 parts by weight.
In Example 1, the density was 35 kg / m ³ , the number of cells was 7.5 cells / 25 mm, the thermal conductivity was 0.047 W / m · K, the air permeability was 11 cm ³ / cm ² · s, and the rebound was 38%.

Example 2 is a polyether polyol A1 having an EO addition rate of 80% by weight, a molecular weight of 4000, and a functional group number of 3 as a polyol, 5 parts by weight, an EO addition rate of 15% by weight, a molecular weight of 5000, and a functional group number of 3 as a polyether polyol A2-1. 35 parts by weight, 20% by weight of a polyether polyol A2-2 having an EO addition rate of 15% by weight, a molecular weight of 7,000 and a number of functional groups of 3 and a polymer polyol having a EO addition rate of 15% by weight, a molecular weight of 5,000 and a number of functional groups of 3 Using 40 parts by weight of polyol A3, 1.2 parts by weight of crosslinking agent-1, 1.1 parts by weight of crosslinking agent-2, 3.2 parts by weight of water as a blowing agent, catalyst-1 (foaming catalyst) , 0.05-2 parts by weight of catalyst-2 (resin-forming catalyst), foam stabilizer-2 (linear silicone foam stabilizer, viscosity of 1560 mPa · s (25 ° C.), surface tension) 0.6mN / m (25 ℃)) and 1.5 parts by weight, is an example produced from polyurethane foam composition comprising an isocyanate 1 from 41.8 parts by weight.
In Example 2, the density was 43 kg / m ³ , the number of cells was 12.5 cells / 25 mm, the thermal conductivity was 0.045 W / m · K, the air permeability was 10 cm ³ / cm ² · s, and the rebound was 42%.

Example 3 does not include a polyether polyol A1 having an EO addition ratio of 80% by weight as a polyol, 40 parts by weight of a polyether polyol A2-1 having an EO addition ratio of 15% by weight, a molecular weight of 5,000 and a number of functional groups of 3, and EO addition. 10% by weight of a polyether polyol A2-2 having a ratio of 15% by weight and a molecular weight of 7000 and a number of functional groups of 3; 50 parts by weight of a polyether polyol A3 composed of a polymer polyol having a molecular weight of 5000 and a number of functional groups of 3 with an EO addition rate of 15% by weight; 5 parts by weight of polyether polyol A4 having an EO addition rate of 0% by weight, a molecular weight of 1000 and a number of functional groups of 2 was used, 1.2 parts by weight of crosslinking agent-1, 1.1 parts by weight of crosslinking agent-2, and a foaming agent. 2.7 parts by weight of water, 0.05 parts by weight of catalyst-1 (foaming catalyst), 0.52 parts by weight of catalyst-2 (resining catalyst), and foam stabilizer-2 (linear silicic acid) Polyurethane foam composition comprising 1.5 parts by weight of a foam-based foam stabilizer, a viscosity of 1560 mPa · s (25 ° C.), a surface tension of 20.6 mN / m (25 ° C.) and 32.5 parts by weight of isocyanate 1. It is an example manufactured from.
In Example 3, the density was 56 kg / m ³ , the number of cells was 22.5 cells / 25 mm, the thermal conductivity was 0.040 W / m · K, the air permeability was 2 cm ³ / cm ² · s, and the rebound was 30%.

In Example 4, a polyether polyol A1 having an EO addition rate of 80% by weight, a molecular weight of 4000 and a number of functional groups of 3 was used as a polyol, and a polyether polyol A2-1 having an EO addition rate of 15% by weight, a molecular weight of 5000 and a number of functional groups of 3 was used. 30 parts by weight of a polyether polyol A2-2 having 15 parts by weight, an EO addition ratio of 15% by weight, a molecular weight of 7000, and 3 functional groups, and a polyether comprising a polymer polyol having a EO addition ratio of 15% by weight, a molecular weight of 5000, and 3 functional groups. Using 40 parts by weight of polyol A3, containing no crosslinking agent, 2.9 parts by weight of water as a foaming agent, 0.05 parts by weight of catalyst-1 (foaming catalyst), and catalyst-2 (catalyst for resinification) 0.7 parts by weight, foam stabilizer-1 (linear silicone foam stabilizer, viscosity = 4840 mPa · s (25 ° C.), surface tension = 22.7 mN / m (25 ° C.)) 2 parts by weight, is an example produced from an isocyanate 2 with polyurethane foam composition consisting of 49.0 parts by weight.
In Example 4, the density was 56 kg / m ³ , the number of cells was 7.5 cells / 25 mm, the thermal conductivity was 0.043 W / m · K, the air permeability was 27 cm ³ / cm ² · s, and the rebound was 56%.

Example 5 is a polyether polyol A2-1 having an EO addition rate of 80% by weight, a molecular weight of 4000, and a polyether polyol A1 having 3 functional groups, 10 parts by weight, an EO addition rate of 15% by weight, a molecular weight of 5,000 and a functional group number of 3 as a polyol. 10 parts by weight of a polyether polyol A2-2 having an EO addition rate of 15% by weight, a molecular weight of 7,000 and a number of functional groups of 3, and a polyether comprising a polymer polyol having an EO addition rate of 15% by weight, a molecular weight of 5,000 and a number of functional groups of 3 Using 50 parts by weight of polyol A3, 3 parts by weight of crosslinking agent-3, 2.9 parts by weight of water as a foaming agent, 0.05 parts by weight of catalyst-1 (foaming catalyst), and catalyst-2 (resinization) 0.7 parts by weight of a catalyst), foam stabilizer-1 (linear silicone foam stabilizer, viscosity = 4840 mPa · s (25 ° C.), surface tension = 22.7 mN / mmN / m ( 5 ° C.)) 1.2 parts by weight, is an example produced from polyurethane foam composition comprising an isocyanate 2 from 56.9 parts by weight.
In Example 5, the density was 60 kg / m ³ , the number of cells was 17.5 cells / 25 mm, the thermal conductivity was 0.042 W / m · K, the air permeability was 19 cm ³ / cm ² · s, and the rebound was 45%.

Comparative Example 1 is the same as Example 1, except that the EO addition rate was 80% by weight, the polyether polyol A1 having a molecular weight of 4000 and the number of functional groups was 1 part by weight, the EO addition rate was 15% by weight, the molecular weight was 5000 and the polyether polyol was a functional group number of 3 A2-1 was changed to 39 parts by weight, water was used as a foaming agent, 3.4 parts by weight, and foam stabilizer-4 (dimethylsiloxane copolymer, viscosity = 610 mPa · s (25 ° C.) instead of foam stabilizer-2) , Surface tension = 20.8 mN / m (25 ° C.)), a composition for polyurethane foam prepared using 44.8 parts by weight of isocyanate 1 and other components as in Example 1. This is an example of manufacturing.
In Comparative Example 1, the density was 36 kg / m ³ , the number of cells was 42.5 cells / 25 mm, the thermal conductivity was 0.037 W / m · K, the air permeability was 43 cm ³ / cm ² · s, and the rebound was 67%. Comparative Example 1 uses foam stabilizer-2 (linear silicone foam stabilizer, viscosity 1560 mPa · s (25 ° C.), surface tension 20.6 mN / m (25 ° C.)) as compared with Example 1. Therefore, the number of cells was large and the thermal conductivity was low.

Comparative Example 2 is different from Example 2 in that polyether polyol A1 having an EO addition ratio of 80% by weight and a molecular weight of 4000 and having 3 functional groups was 1 part by weight, and an EO addition ratio of 15% by weight and a polyether polyol having a molecular weight of 5000 and 3 functional groups were used. A2-1 was changed to 39 parts by weight, water was used as a foaming agent at 3 parts by weight, foam stabilizer-4 (dimethylsiloxane copolymer, viscosity = 610 mPa · s (25 ° C.) instead of foam stabilizer-2, surface) (Tension = 20.8 mN / m (25 ° C.)), a polyurethane foam composition prepared using 0.5 parts by weight of isocyanate 1 and 36.9 parts by weight, and other components as in Example 2. It is an example.
In Comparative Example 2, the density was 45 kg / m ³ , the number of cells was 47.5 cells / 25 mm, the thermal conductivity was 0.036 W / m · K, the air permeability was 29 cm ³ / cm ² · s, and the rebound was 70%. Comparative Example 2 used foam stabilizer-2 (linear silicone foam stabilizer, viscosity 1560 mPa · s (25 ° C.), surface tension 20.6 mN / m (25 ° C.)) as compared with Example 2. Therefore, the number of cells was large and the thermal conductivity was low.

Comparative Example 3 is different from Example 3 in that water was used as a foaming agent in an amount of 2.5 parts by weight, and instead of foam stabilizer 2, foam stabilizer 4 (dimethylsiloxane copolymer, viscosity = 610 mPa · s (25 ° C.) A polyurethane foam composition prepared by using 0.5 parts by weight of a surface tension of 20.8 mN / m (25 ° C.), 34.0 parts by weight of isocyanate 1, and other components in the same manner as in Example 3. This is an example.
In Comparative Example 3, the density was 57 kg / m ³ , the number of cells was 57.5 cells / 25 mm, the thermal conductivity was 0.035 W / m · K, the air permeability was 17 cm ³ / cm ² · s, and the rebound was 63%. Comparative Example 3 used foam stabilizer-2 (linear silicone-based foam stabilizer, viscosity 1560 mPa · s (25 ° C.), surface tension 20.6 mN / m (25 ° C.)) as compared with Example 3. Therefore, the number of cells was large and the thermal conductivity was low.

Comparative Example 4 is different from Example 4 in that polyether polyol A1 having an EO addition ratio of 80% by weight, molecular weight of 4000 and 3 functional groups was 3 parts by weight, EO addition ratio of 15% by weight, a polyether polyol having a molecular weight of 5000 and 3 functional groups. A2-1 was changed to 37 parts by weight, an EO addition rate of 15% by weight, a polyether polyol A2-2 having a molecular weight of 7,000 and a number of functional groups of 3 was changed to 10 parts by weight, and a polyether polyol A3 comprising a polymer polyol having a number of functional groups of 3 was changed to 10 parts by weight. Was changed to 50 parts by weight, water was 2.7 parts by weight as a foaming agent, foam stabilizer-3 (silicone foam stabilizer, viscosity of 40 mPa · s (25 ° C.), surface in place of foam stabilizer-1) tension 20.9mN / m (25 ℃)) was used 0.4 part by weight, the isocyanate 2 and 46.5 parts by weight, the polyurethane foam in which the other components in the same manner as in example 4 Is an example prepared from the composition.
In Comparative Example 4, the density was 54 kg / m ³ , the number of cells was 52.5 cells / 25 mm, the thermal conductivity was 0.036 W / m · K, the air permeability was 18 cm ³ / cm ² · s, and the rebound was 55%. In Comparative Example 4, as compared with Example 4, foam stabilizer-1 (linear silicone foam stabilizer, viscosity 4840 mPa · s (25 ° C.), surface tension = 22.7 mN / m (25 ° C.)) Since it was not used, the number of cells was large and the thermal conductivity was low.

Comparative Example 5 is different from Example 5 in that the polyether polyol A1 having an EO addition ratio of 80% by weight, the molecular weight of 4000 and the number of functional groups of 3 was 2 parts by weight, the polyether polyol having an EO addition ratio of 15% by weight, the molecular weight of 5000 and the number of functional groups of 3 was used. A2-1 was changed to 38 parts by weight, water was 2.7 parts by weight as a foaming agent, and foam stabilizer-3 (silicone-based foam stabilizer, viscosity 40 mPa · s (25 ° C.) ), A surface tension of 20.9 mN / m (at 25 ° C.), 0.4 parts by weight, isocyanate 2 at 57.4 parts by weight, and other components as in Example 5. This is an example of manufacturing.
In Comparative Example 5, the density was 59 kg / m ³ , the number of cells was 47.5 cells / 25 mm, the thermal conductivity was 0.037 W / m · K, the air permeability was 28 cm ³ / cm ² · s, and the rebound was 47%. In Comparative Example 5, as compared with Example 5, foam stabilizer-1 (linear silicone foam stabilizer, viscosity 4840 mPa · s (25 ° C.), surface tension = 22.7 mN / m (25 ° C.)) Since it was not used, the number of cells was large and the thermal conductivity was low.

As described above, the molded polyurethane foam of the example has a higher thermal conductivity than the molded polyurethane foam of the comparative example, and when used as an interior material for a vehicle, the cooling and heating efficiency of the vehicle interior can be increased. Further, the molded polyurethane foam of the example has a cell number of 5 to 25 cells / 25 mm, and when used as a cushioning material such as a vehicle seat cushion, it may adversely affect the cushioning property and the feel during compression. There is no.
The molded polyurethane foam of the present invention can be similarly used for interior materials for vehicles such as headrests and armrests in addition to seat cushions.

10: Mold polyurethane foam 20: Die 21: Lower mold 22: Upper mold N: Injection nozzle P: Polyurethane foam composition

Claims (9)

In a molded polyurethane foam obtained from a polyurethane foam composition containing a polyol, a foaming agent, a catalyst, a foam stabilizer, and an isocyanate,
The polyol includes a low EO polyether polyol having an ethylene oxide addition ratio of 1 to 25% by weight, and a polymer polyol,
A molded polyurethane foam, wherein the foam stabilizer is a silicone-based foam stabilizer having a viscosity of 1000 mPa · s (25 ° C.) or more and a surface tension of 26 mN / m or less.   When the total polyol amount is 100 parts by weight, the low EO polyether polyol is 30 to 80 parts by weight, and the silicone-based foam stabilizer is a linear silicone. The described molded polyurethane foam.   3. The molded polyurethane foam according to claim 1, wherein the isocyanate is an MDI-based isocyanate alone or a combination of an MDI-based isocyanate and TDI. 4.   The molded polyurethane foam according to any one of claims 1 to 3, wherein the catalyst includes two types of a foaming catalyst and a resinification catalyst.   5. The polyol according to claim 1, wherein the polyol includes a high EO polyether polyol having an ethylene oxide addition ratio of 70 to 100% by weight together with the low EO polyether polyol and the polymer polyol. 6. The molded polyurethane foam according to item 1.   The molded polyurethane foam according to any one of claims 1 to 5, wherein the composition for a polyurethane foam contains a crosslinking agent. The mold polyurethane foam, according to claim density 30~70kg / ^{m 3,} the number of cells 4-30 cells / 25 mm, thermal conductivity, characterized in that a 0.039~0.050W / m · K 1 The molded polyurethane foam according to any one of claims 1 to 6. Polyol, a foaming agent, a catalyst, a foam stabilizer, a method for producing a molded polyurethane foam in which a composition for a polyurethane foam containing isocyanate is injected into a mold and foamed.
The polyol includes a low EO polyether polyol having an ethylene oxide addition ratio of 1 to 25% by weight, and a polymer polyol,
A method for producing a molded polyurethane foam, wherein the foam stabilizer is a silicone-based foam stabilizer having a viscosity of 1000 mPa · s (25 ° C.) or more and a surface tension of 26 mN / m or less. When the total polyol amount is 100 parts by weight, the low EO polyether polyol is 30 to 80 parts by weight,
The method for producing a molded polyurethane foam according to claim 8, wherein the silicone-based foam stabilizer is a linear silicone.

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