JP2001002749A - Flexible polyurethane slab foam and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a flexible polyurethane slab foam excellent in a soft surface feeling, supporting property, durability and flame retardancy by employing a specific organic polyisocyanate and a specific polyol. SOLUTION: This flexible polyurethane slab foam is obtained by pouring the following liquid mixture on a conveyor and by reacting it so as to foam: (A) organic polyisocyanates where 5-80 mass% diphenylmethane diisocyanate comprising 5-30 mass% 2,4'-isomer, 2-40 mass% polymethylenepolyphenyl polyisocyanate comprising 20-50 mass% diphenylmethane diisocyanate, 20-65 polyether polyol where the content of oxyethylene in oxyalkylenes is <50 mass% and 1.0-5 mass% polyether polyol where the content of oxyethylene in oxyalkylenes is >=50 mass% are contained and the content of NCO is 10-25 mass%, (B) polyols comprising a polyoxypropylenepolyol where end ethylene oxides are capped and a polyetherpolyol where the content of oxyethylene in oxyalkylenes is >=50 mass% in a mass content ratio of (10:0) to (0.5: 25), (C) a catalyst, (D) water as a foaming agent, (E) a foam stabilizer and (F) a supplementary agent.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flexible polyurethane slab foam and a method for producing the same, and more particularly to a flexible polyurethane slab foam having excellent supportability, durability, flame retardancy, production efficiency, and a wide range by changing the compounding ratio. The present invention relates to a flexible polyurethane slab foam capable of obtaining density and hardness and a method for producing the same.

[0002]

2. Description of the Related Art Soft polyurethane slab foam is cut into a suitable size, and is used for a wide range of applications such as cushioning materials for furniture and automobile seats, mattresses for bedding, pillows, industrial sealing materials and soundproofing materials. In recent years, with the aging, the need for good supportability in furniture and mattress applications, and moreover, for foams with high flame retardancy has been increasing. At the production site, a highly reactive and highly curable raw material system with high production efficiency is desired.

A technique using toluene diisocyanate as a polyisocyanate component as a flexible polyurethane slab foam is already widely known. Also, recently, a slab foam using diphenylmethane diisocyanate having a low vapor pressure as a polyisocyanate component has been proposed because of the effect of isocyanate on the health of workers at the production site and the improvement of reactivity.

[0004] However, a flexible polyurethane slab foam which has high productivity and can obtain a wide range of densities and hardnesses by changing the mixing ratio, supportability, durability, flame retardancy, and its production technology have been known. I didn't.

[0005]

The present invention relates to a polyol-modified polyisocyanate having a specific diphenylmethane diisocyanate as a raw material, a specific polyether polyol, a foaming agent, a catalyst, a foam stabilizer and, if necessary, an auxiliary agent. Using the surface soft feel, support,
It is intended to provide a flexible polyurethane slab foam capable of obtaining a wide range of densities and hardnesses by changing durability, flame retardancy, and further a mixing ratio, and a method for producing the same. Particularly, the foam density is 20 to 100 kg / m ³ , and the hardness is high. ILD30 ~
Suitable for 250 N / 314 cm ² flexible polyurethane slab foam.

[0006]

Means for Solving the Problems As a result of intensive studies, the present inventors have found that by using a specific polyurethane foam composition, the moldability, supportability, durability and flame retardancy are excellent and a wide range is obtained. The inventors have found that a flexible polyurethane slab foam having a density hardness can be obtained, and have reached the present invention.

That is, the present invention provides a mixed solution of an organic polyisocyanate (A), a polyol (B), a catalyst (C), water (D) as a foaming agent, a foam stabilizer (E), and other auxiliaries (F). Polyurethane slab foam obtained by pouring into a box or a conveyor and reacting and foaming, and 2,4 'as an organic polyisocyanate (A).
-5 to 80% by mass of diphenylmethane diisocyanate containing 5 to 30% by mass of isomer, 2 to 40% by mass of polymethylene polyphenyl polyisocyanate containing 20 to 50% by mass of diphenylmethane diisocyanate, and 50% by mass of oxyethylene content in oxyalkylene %, The number of functional groups is 2 to 4, and the average hydroxyl equivalent is 200 to 2,50.
0 to 20% by mass of polyether polyol, 2 to 4 functional groups having an oxyethylene content of 50% by mass or more in oxyalkylene, and an average hydroxyl equivalent of 200 to 2.5.
The polyether polyol contains a prepolymer having an NCO content of 10 to 20% by mass and a polyether polyol of 0.1 to 5% by mass.
3. Polyoxypropylene polyol (a) having a terminal ethylene oxide cap having an average hydroxyl equivalent of 1,000 to 2,500 and the number of functional groups in which oxyethylene in the oxyalkylene is 50 mass% or more is 2 to 6, and the average hydroxyl equivalent is 200 to 2,000. A polyether polyol (b) having a mass ratio of (a) :( b) = 2,000
= 100: 0.5 to 25, and an equivalent ratio of isocyanate groups to hydroxyl groups is 0.5 to 1.5, and a method for producing the same.

The organic polyisocyanate (A) used in the present invention includes 5 to 80% by weight of 4,4'-diphenylmethane diisocyanate containing 5 to 30% by weight of isomers of 2,4'-diisocyanate and 20% by weight of diphenylmethane diisocyanate. 2 to 40% by mass of polymethylene polyphenyl polyisocyanate containing -50% by mass, oxyethylene content in oxyalkylene of less than 50% by mass and 2 to 4 functional groups, average hydroxyl equivalent of 200 to 2.5
20 to 65% by mass of a polyether polyol having an oxyethylene content of 50% by mass or more in an oxyalkylene having an average hydroxyl equivalent of 200 to 2,
It is a prepolymer having an NCO content of 10 to 25% by mass, comprising 0.1 to 5% by mass of a 500 polyether polyol.

The two types of polyether polyols used in the prepolymer include water, propylene glycol, dipropylene glycol, diethylene glycol,
Glycerin, trimethylolpropane, polyols such as pentaerythritol, or diethanolamine, triethanolamine, amino alcohols such as tripropanolamine, or ethylenediamine,
Examples of amines such as 1,6-hexanediamine, tolylenediamine, and methylenebisaniline include block or random ring-opening copolymers of alkylene oxides such as ethylene oxide and propylene oxide. When the oxyethylene content in the oxyalkylene is less than 50% by mass, the number of functional groups is 2 to 4, and the average hydroxyl equivalent is 200 to 2.5.
More preferable examples of the polyether polyol of No. 00 are polypropylene polyol or an ethylene oxide / propylene oxide block copolymer.
The oxyalkylene has an oxyethylene content of 50% by mass or more having 2 to 6 functional groups and an average hydroxyl equivalent of 20.
Further preferred as the polyether polyol of 0 to 2,500 is a random copolymer of ethylene oxide / propylene oxide. By using an organic isocyanate modified with these two kinds of polyols, a slab foam having good appearance, air permeability, and good physical properties in a wide range of density and hardness can be obtained.

For the purpose of improving the heat sealing property and the adhesion in post-processing, other polyols can be used in combination for modifying the prepolymer within a range not exceeding the total amount of the modifying polyether polyol. Specific examples thereof include glutaric acid, adipic acid, sebacic acid, azelaic acid, phthalic anhydride, isophthalic acid, terephthalic acid,
Maleic acid, fumaric acid, dicarboxylic acids such as dimer acid and ethylene glycol, 1,2-propylene glycol, diethylene glycol, neopentyl glycol,
1,4-butanediol, 1,5-pentanediol,
1,6-hexanediol, 3-methyl-1,5-pentanediol, 2-ethyl-2-butyl-1,3-propanediol, 1,9-nonanediol,
Glycerin, a polyester polyol obtained by a polycondensation reaction with a triol such as trimethylolpropane,
ε-caprolactone, cyclic lactones such as δ-valerolactone, ethylene glycol, diethylene glycol,
Examples include polyester polyol obtained by ring-opening polymerization using neopentyl glycol, glycerin, trimethylolpropane and the like as an initiator, polytetramethylene glycol obtained by cationic polymerization of tetrahydrofuran, and the like. The hydroxyl equivalent of these polyols is 20
0 to 2,000 is preferred.

The method of synthesizing the prepolymer is not particularly limited, and is a method in which the entire amount of the isocyanate raw material and the polyol raw material are charged to form a prepolymer, a part of the isocyanate raw material is reacted with the polyol raw material, and then the remaining isocyanate raw material is mixed. Methods and the like can be applied. Also,
The present organic polyisocyanate can be further divided into two components depending on the number of raw material components applicable to the foaming machine used. In this case, the present organic polyisocyanate is preferably two components, a component mainly composed of a prepolymer composed of diphenylmethane diisocyanate and a polyol, and a component mainly composed of polymethylene polyphenyl polyisocyanate containing diphenylmethane diisocyanate.
Depending on the mixing ratio of the mixing apparatus, the prepolymer-based component may partially contain the polymethylene polyphenylisocyanate component, or the polymethylene polyphenylene polyisocyanate component may be partially prepolymerized. By dividing into two components in this way, the range of adjusting the hardness and the density can be further expanded.

It should be noted that other isocyanates may be partially used in combination for the purpose of adjusting the flowability, hardness, foaming speed and the like. Specific examples include 2,4-tolylene diisocyanate,
2,6-tolylene diisocyanate, o-xylylene diisocyanate, m-xylylene diisocyanate, p
-Aromatic diisocyanate such as xylylene diisocyanate, hexamethylene diisocyanate, 2-methyl-
1,5-pentanediisocyanate, 3-methyl-1,
Aliphatic diisocyanates such as 5-pentane diisocyanate, isophorone diisocyanate, hydrogenated diphenylmethane diisocyanate, hydrogenated tolylene diisocyanate, hydrogenated xylylene diisocyanate, diisocyanates such as alicyclic diisocyanates such as cyclohexyl diisocyanate, and biuret modified products of these diisocyanates, Modified isocyanurate, modified uretonimine, modified carbodiimide, modified polyol.

The NCO content of the organic polyisocyanate is 1
It is 0 to 25% by mass, particularly preferably 10 to 20% by mass. NCO content of organic polyisocyanate is 25
If the content exceeds 10% by mass, the initial reaction becomes too fast and rapid foaming occurs to deteriorate the moldability. On the other hand, if the NCO content is less than 10% by mass, the viscosity of the raw material itself becomes too high, and the occurrence of underfill due to deterioration of flowability and A non-uniform foam is likely to occur.

The polyether polyol used in the polyol (B) of the present invention includes polyoxypropylene polyol (a) having 2 to 3 functional groups and having an average hydroxyl equivalent of 1,000 to 2,500 and having an ethylene oxide cap at the terminal end, and Oxyethylene in alkylene is 50
It is composed of a polyether polyol (b) having 2 to 6 functional groups and an average hydroxyl equivalent of 200 to 2,000 by mass% or more, and the mass ratio thereof is (a) :( b) = 10
0: 0.5 to 25.

These polyether polyols include water,
Polyols such as propylene glycol, dipropylene glycol, glycerin, trimethylolpropane, pentaerythritol and sorbitol, or amino alcohols such as diethanolamine, triethanolamine and tripropanolamine, or ethylenediamine, 1,6-hexanediamine and triethylene It can be obtained by adding propylene oxide or ethylene oxide to amines such as tetraamine, aniline, toluylenediamine and methylenebisaniline.

In the present invention, a polymer polyol having a solid content of 15 to 50% by mass and having 2 to 4 functional groups and an average hydroxyl equivalent of 1,000 to 3,000 is further used in combination for the purpose of improving flame retardancy and adjusting hardness. can do. As the base polyol, water, propylene glycol, dipropylene glycol, glycerin, trimethylolpropane, polyols such as pentaerythritol, or diethanolamine, triethanolamine, amino alcohols such as tripropanolamine, or ethylenediamine, 1, Polyether polyols obtained by adding alkylene oxides such as ethylene oxide and propylene oxide to amines such as 6-hexanediamine, triethylenetetraamine and methylenebisaniline can be used. As the polymer particle component, a polymer of an ethylenically unsaturated monomer such as acrylonitrile, styrene, methyl methacrylate and / or an aminoplast resin selected from urea, melamine and phenol can be used. Specific examples of polymer polyols using aminoplast resins include M-950, US-301, UH-201, and UC manufactured by Asahi Glass.
-801. Polyurethane particles or polyurea particle-dispersed polyether polyol obtained by reacting an isocyanate with an amino alcohol or an amine compound in a polyether polyol can also be used. A particularly preferred polymer component is an aminoplast resin selected from urea, melamine, and phenol.

The catalyst (C) used in the present invention includes:
Various urethanization catalysts and trimerization catalysts known in the art can be used. Representative examples include triethylamine, tripropylamine, tributylamine, N-methylmorpholine, N-ethylmorpholine, dimethylbenzylamine, N, N, N ', N'-tetramethylhexamethylenediamine, N, N, N', N ', N "-pentamethyldiethylenetriamine, triethylenediamine, bis-
Tertiary amines such as (2-dimethylaminoethyl) ether, 1,8-diaza-bicyclo (5,4,0) undecene-7, dimethylethanolamine, N-trioxyethylene-N, N-dimethylamine, N , N-dimethyl-N
-Reactive tertiary amines such as hexanolamine or organic acid salts thereof, 1-methylimidazole, 2-methylimidazole, 1,2-dimethylimidazole, 2,4-dimethylimidazole, 1-butyl-2-methylimidazole, etc. Imidazole compound, stannas octoate,
Organometallic compounds such as dibutyltin dilaurate and zinc naphthenate; 2,4,6-tris (dimethylaminomethyl) phenol; 2,4,6-tris (dialkylaminoalkyl) hexahydro-S-triazine; potassium acetate; A trimerization catalyst such as potassium ethylhexanoate may be used.

It is preferable to use at least an imidazole-based compound and an ether group-containing tertiary amine compound as a catalyst in consideration of a mild reaction and a high curing property. Particularly preferred catalysts are 1,2-dimethylimidazole and bis- (2- (Dimethylaminoethyl) ether.

In the present invention, water is used as the blowing agent (D). Foaming is carried out with carbon dioxide gas generated by the reaction between the isocyanate group and water. For the purpose of lowering the density, a method of mixing carbon dioxide in a liquid form and vaporizing and foaming at the time of foaming can also be used in combination. The amount of water is organic polyisocyanate 1
The amount is preferably 2 to 20 parts by mass with respect to 00 parts. When liquefied carbon dioxide is used in combination, the amount is preferably 0.5 to 6 parts by mass based on 100 parts by mass of the organic polyisocyanate.

The foam stabilizer (E) used in the present invention is an organic silicon-based surfactant known in the art, for example, L-520, L-540, L-5309, L-5309, manufactured by Nippon Unicar Co., Ltd.
-5366, SZ-1306, SH-190, SH-192, SH-193, SH manufactured by Toray Dow Corning
-194, SRX-274C, SF-2962, SF-
2964, Goldschmidt B-4113, B
-8680, DC-2583 manufactured by Air Products,
DC-5043, DC-5169 and the like. These foam stabilizers are preferably used in an amount of 0.1 to 3 parts by mass based on 100 parts by mass of the organic polyisocyanate.

In the present invention, diethanolamine or triethanolamine can be added to the auxiliary agent (F) for the purpose of stabilizing the cell. A preferable addition amount is 0.5 to 2 parts by mass with respect to 100 parts by mass of the polyol component.

In the present invention, if necessary, the auxiliary agent (F) is represented by trichloroethyl phosphate, trichloropropyl phosphate, a phosphorus-halogen type liquid flame retardant represented by a condensation type thereof, or melamine powder. Solid flame retardants, conductive carbon typified by Ketjen Black, plasticizers such as dioctyl phthalate, antioxidants, ultraviolet absorbers, coloring agents, internal mold release agents, and other auxiliaries can be used. These auxiliaries are usually used by adding them to a polyol. However, auxiliaries having no active hydrogen capable of reacting with isocyanate can also be mixed in advance with an organic isocyanate.

The isocyanate (NCO) in the present invention
The hydroxyl / (OH) equivalent ratio is 0.5 to 1.5, particularly preferably 0.6 to 1.0.

As the production apparatus of the present invention, a multi-component type foaming machine having a rotor rotating type or high pressure impingement type mixing head known in the art for mixing raw materials is used. Foams of any size can be obtained by foaming in a box or continuously on a belt conveyor.

[0025]

The slab foam obtained by the present invention is particularly excellent in durability, supportability, flame retardancy, etc., and is used for cushioning materials for furniture such as sofas, clothing, cushioning materials for automobiles and railway vehicles, and automobiles. For interior materials, mattresses, futons, beddings such as pillows, sound absorbing materials, sound insulating materials, home appliances,
It is useful for electronic parts, industrial sealing materials, packing materials, daily necessities and the like.

Next, the present invention will be specifically described based on examples and comparative examples, but the present invention is not limited to these examples unless it exceeds the gist. In addition,
Unless otherwise specified, “parts” and “%” in the text are based on mass.

(Raw materials used) (1) Isocyanate Isocyanate A: diphenylmethane diisocyanate containing 10% 2,4'-diphenylmethane diisocyanate Isocyanate B: diphenylmethane diisocyanate containing 30% 2,4'-diphenylmethane diisocyanate Isocyanate C: diphenylmethane diisocyanate D: Polymethylene polyphenyl polyisocyanate containing 45% of diphenylmethane diisocyanate Isocyanate E: TDI-80 (2,4-toluene diisocyanate / 2,6-toluene diisocyanate =
80/20 mixture) Isocyanate F: polymethylene polyphenyl polyisocyanate containing 70% of diphenylmethane diisocyanate (2) polyol Polyol A: polyoxypropylene polyol having a nominal number of functional groups of 3 and an average hydroxyl equivalent of 1000 polyol B: nominal number of functional groups of 3, Polyoxypropylene polyol end-capped with ethylene oxide (15%) having an average hydroxyl equivalent of 2000 Polyol C: a polyoxyethylene / propylene random copolymer polyol containing a nominal number of functional groups of 3 and an average hydroxyl equivalent of 1250 and containing 80% of oxyethylene D: polyoxyethylene polyol having a nominal number of functional groups of 3 and an average hydroxyl equivalent of 500. Polyol E: poly having a nominal number of functional groups of 6 and an average hydroxyl equivalent of 200. Oxyethylene polyol Polyol F: Polyoxyethylene polyol having a nominal number of functional groups of 2 and an average hydroxyl equivalent of 300 Polyol G: Polymer polyol containing 20% solids (melamine dispersed polymer polyol: M-950:
(3) Catalyst TOYOCAT DP-70: amine catalyst, DPG solution of 1,2-dimethylimidazole (manufactured by Tosoh) TEDA L33: amine catalyst, DPG solution of triethylenediamine (manufactured by Tosoh) TOYOCAT ET: amine catalyst, bis (2-
Dimethylaminoethyl) ether (manufactured by Tosoh) Dabco T-9: metal catalyst, stanna octoate (manufactured by Air Products) (4) Additives diethanolamine SF-2962: silicone foam stabilizer (manufactured by Dow Corning Toray) Dabco DC194: Silicone foam stabilizer (manufactured by Air Products) SRX-280A: Silicone foam stabilizer (manufactured by Dow Corning Toray) Melamine powder: (manufactured by Nissan Chemical) CR-530: Halogen-containing condensed phosphate ester (manufactured by Daihachi Chemical) Carbon: Ketjen Black (made by Asahi Carbon)

(Synthesis of Polyisocyanate) After a reactor equipped with a stirrer, a cooling pipe, a nitrogen introducing pipe, and a thermometer was purged with nitrogen, isocyanates A and C were charged in predetermined amounts shown in Table 1, and heated at 80 ° C. Subsequently, polyols A and C were charged in predetermined amounts shown in Table 1, and reacted at 80 ° C. with stirring for 4 hours to obtain MDI prepolymer A.
The NCO content of MDI prepolymer A was 10.7%. Hereinafter, similarly, MDI prepolymers B, C, D,
E was obtained. The synthesis results are shown in Table 1.

[0029]

[Table 1]

Examples 1 to 5, Comparative Examples 1 to 3 According to the formulation shown in Table 2, Cannon Vikin
Using a multi-component low-pressure foaming machine manufactured by Company g, a polyurethane foam was produced in the following manner. Each component, which has been adjusted to a raw material temperature of 25 ± 2 ° C., is stirred and mixed at a predetermined ratio under a rotation speed of 4500 rpm, and is continuously poured onto a conveyor having a width of 750 mm to form a slab foam block having a length of 2000 mm and a height of 700 mm. Molded. The obtained polyurethane foam was left for 24 hours after production, and then the foam was 300 mm ×
It was cut to 300 mm x 50 mm, and its physical properties were measured.
The results are shown in Table 2.

(Measurement Method of Foam Physical Properties) The foam physical properties were measured according to JIS K-6400 (1997). The unit is as follows. Total density: kg / m ³ Hardness (25% ILD): N / 314 cm ² Ball rebound value:% Durability: Compression residual permanent set:% Repetitive compressive residual strain:% (Measurement environmental temperature: + 25 ° C, 55RH%)

Evaluation of foam feel and supportability is described in JA.
From the load-deflection curve obtained by the load test method described in SO B-408, the load values at 5%, 20%, 25%, and 65% deflection were measured. Tactility (feeling factor) and supportability (support factor) were obtained from the following formulas. Feeling factor = Load value at 20% deflection / Load value at 5% deflection (The larger the value, the softer the surface). Support factor = Load value at 65% deflection / Load value at 25% deflection. There is a feeling of support)

(Method of Measuring Flame Retardancy) Flame retardancy 1: Measured according to JIS K-6400 (1997) A method. Unit: mm / min. Flame retardancy 2: Measured by JIS K-6400 (1997) B method. (Method for Measuring Conductivity) Conductivity: 25 ° C., 55 according to JIS K-6911
Performed at RH%.

[0034]

[Table 2]

The polyurethane foam of the present invention had good values in durability (residual compression set, repeated compression set), feel factor, support factor, and flame retardancy.

Examples 6 to 10 A flexible polyurethane slab foam was produced in the same manner as in Example 1, and its physical properties were measured in the same manner. Table 3 shows the results.

[0037]

[Table 3]

By changing the mixing ratio, polyurethane foams having a wide range of densities and hardnesses were obtained, and their durability (compressive permanent set, repeated compressive residual strain), feel factor, support factor, and flame retardancy were all good. Was.

Examples 11 to 12 In the same manner as in Example 1, a flexible polyurethane slab foam to which a flame retardant was added was produced, and its physical properties were measured in the same manner. Table 4 shows the results.

[0040]

[Table 4]

The polyurethane foam of the present invention exhibited very high flame retardancy and good durability (residual compression set).

Example 13 In the same manner as in Example 1, a flexible polyurethane slab foam to which a conductive substance was added was produced, and its physical properties were measured in the same manner. Table 5 shows the results.

[0043]

[Table 5]

The polyurethane foam of the present invention exhibited very good conductive performance and durability (residual compression set).

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C08K 5/17 C08K 5/17 5/3477 5/3477 5/521 5/521 C08L 75/08 C08L 75 / 08 // (C08G 18/10 101: 00) C08L 75:04 F term (reference) 4J002 CK041 DA039 DE027 EN026 EN036 EN046 EN056 EU116 EU136 EU186 EU189 EU236 EW049 EX008 FD156 4J034 DA01 DB03 DC50 DG01 DG02 DG04 DG14 HA01 HA07 HC12 HC HC71 KA01 KB05 KD12 MA02 MA14 MA16 NA03 NA05 NA08 QA02 QA03 QC01

Claims (12)

[Claims] 1. A mixture of an organic polyisocyanate (A), a polyol (B), a catalyst (C), water (D) as a foaming agent, a foam stabilizer (E), and other auxiliaries (F) in a box or In a flexible polyurethane slab foam obtained by continuously pouring and foaming on a conveyor, as an organic polyisocyanate (A), diphenylmethane diisocyanate containing 5 to 30% by mass of 2,4'-isomer 5 to 80% by mass, diphenylmethane 2 to 40% by mass of polymethylene polyphenyl polyisocyanate containing 20 to 50% by mass of diisocyanate, oxyethylene content of less than 50% by mass in oxyalkylene, 2 to 4 functional groups, and average hydroxyl equivalent of 200 to 2,500. 20 to 65% by mass of ether polyol, oxyethylene content in oxyalkylene is 50% The amount% or more functional groups 2-4, consists of a polyether polyol from 0.1 to 5 wt% of the average hydroxyl equivalent weight 200～2,500 NC
It is a prepolymer having an O content of 10 to 25% by mass. As the polyol (B), a polyoxypropylene polyol (a) having a terminal ethylene oxide cap having 2 to 3 functional groups and an average hydroxyl equivalent of 1,000 to 2,500 is used as a polyol (B). It consists of polyether polyol (b) having 2 to 6 functional groups in which oxyethylene in the alkylene is 50% by mass or more and an average hydroxyl equivalent of 200 to 2,000, and the mass ratio of (a) :( b) = 10
0: 0.5 to 25, wherein the equivalent ratio of isocyanate groups to hydroxyl groups is 0.5 to 1.5. 2. The flexible polyurethane slab foam according to claim 1, wherein the catalyst (C) uses two or more compounds containing at least an imidazole compound and an ether group-containing tertiary amine compound. 3. An auxiliary agent (F) containing diethanolamine or triethanolamine, and the diethanolamine or triethanolamine being added to a polyol (B) 10
The flexible polyurethane slab foam according to claim 1 or 2, wherein 0.5 to 2 parts by mass is added to 0 parts by mass. 4. A foam density of 20 to 100 kg /
m ^3, flexible polyurethane slab foam according to claim 1, characterized in that the ILD30~250N / 314cm ^2. 5. A conductive carbon is used for the auxiliary agent (F),
And 1 to 20% by mass of the conductive carbon based on all raw materials
The flexible polyurethane slab foam according to any one of claims 1 to 4, which is added. 6. A melamine powder and / or a phosphate ester-based flame retardant is used as the auxiliary agent (F), and the melamine powder and / or a phosphate ester-based flame retardant is 5 to 30% by mass based on the whole raw material. %.
The flexible polyurethane slab foam according to any one of the above. 7. A mixture of an organic polyisocyanate (A), a polyol (B), a catalyst (C), water (D) as a foaming agent, a foam stabilizer (E), and other auxiliaries (F) in a box or In a flexible polyurethane slab foam obtained by continuously pouring and foaming on a conveyor, as an organic polyisocyanate (A), diphenylmethane diisocyanate containing 5 to 30% by mass of 2,4'-isomer 5 to 80% by mass, diphenylmethane 2 to 40% by mass of polymethylene polyphenyl polyisocyanate containing 20 to 50% by mass of diisocyanate, oxyethylene content of less than 50% by mass in oxyalkylene, 2 to 4 functional groups, and average hydroxyl equivalent of 200 to 2,500. 20 to 65% by mass of ether polyol, oxyethylene content in oxyalkylene is 50% The amount% or more functional groups 2-4, consists of a polyether polyol from 0.1 to 5 wt% of the average hydroxyl equivalent weight 200～2,500 NC
It is a prepolymer having an O content of 10 to 25% by mass. As the polyol (B), a polyoxypropylene polyol (a) having a terminal ethylene oxide cap having 2 to 3 functional groups and an average hydroxyl equivalent of 1,000 to 2,500 is used as a polyol (B). It consists of polyether polyol (b) having 2 to 6 functional groups in which oxyethylene in the alkylene is 50% by mass or more and an average hydroxyl equivalent of 200 to 2,000, and the mass ratio of (a) :( b) = 10
0: 0.5 to 25, and the equivalent ratio of isocyanate groups to hydroxyl groups is 0.5 to 1.5, a method for producing a flexible polyurethane slab foam. 8. The process for producing a flexible polyurethane slab foam according to claim 7, wherein the catalyst (C) uses two or more compounds containing at least an imidazole compound and an ether group-containing tertiary amine compound. 9. An auxiliary agent (F) containing diethanolamine or triethanolamine, and the diethanolamine or triethanolamine being added to the polyol (B) 10
The method for producing a flexible polyurethane slab foam according to claim 7 or 8, wherein 0.5 to 2 parts by mass is added to 0 parts by mass. 10. A foam density of 20 to 100 kg / m.
^3, The process for producing a flexible polyurethane slab foam according to any one of claims 7-9, characterized in that the ILD30~250N / 314cm ^2. 11. The method according to claim 7, wherein conductive carbon is used as the auxiliary agent (F), and the conductive carbon is added in an amount of 1 to 20% by mass based on the total amount of the raw material. A method for producing the flexible polyurethane slab foam according to the above. 12. A melamine powder and / or a phosphate ester-based flame retardant is used as the auxiliary agent (F), and the melamine powder and / or a phosphate ester-based flame retardant is 5 to 30% by mass based on the whole raw material. %.
12. The method for producing a flexible polyurethane slab foam according to any one of 11).