KR100794133B1 - Manufacturing Method Of Non-yellowing Flexible Polyurethane Foam With High Resilience And Durability - Google Patents

Abstract

The present invention provides a method for producing a flexible polyurethane foam by catalyzing an isocyanate with a polyol. (A) A polyether having an ethylene oxide content of 0 to 30% by weight, a propylene oxide content of 70 to 100% by weight, and a molecular weight of 400 to 7,000. A polyol using a polyether polyol containing 20 to 60% by weight of a polyol and (B) a polyvinyl compound, or (C) an alcohol and is synthesized by condensation polymerization of an alcohol with a functional group of 2 to 3, viscosity A resin premix using a polyester polyol of 5,000 to 30,000 cps or a mixed catalyst of octylic acid tin and dibutyltin dilaurate and an amine catalyst simultaneously in a mixed polyol of the above (A), (B) and (C) polyols A method for producing a flexible urethane having excellent yellowing resistance is provided by reacting a premix) with an aliphatic isocyanate modified with reactivity.

Flexible polyurethane foams, isocyanates, polyols, resin reaction catalysts, amine catalysts, tin catalysts

Description

Manufacturing Method Of Non-yellowing Flexible Polyurethane Foam With High Resilience And Durability}

1 is a graph showing the yellowness of the flexible polyurethane foam obtained in Example 1 and Comparative Example 3 of the present invention.

The present invention relates to a method for producing a flexible polyurethane foam having a yellowing resistance while ensuring a stable foam structure and elasticity and durability. More specifically, in the method for producing a flexible polyurethane foam by catalytic reaction of isocyanate and polyol,

i) (A) Polyol using polyether polyol having 0 to 30% by weight of ethylene oxide content, 70 to 100% by weight of propylene oxide and molecular weight 400 to 7,000, and (B) solid content of polyvinyl compound is 20-60 Polyols using together polyether polyols by weight,

ii) (C) polyester polyol which is synthesized by condensation polymerization of alcohol and acid, and has 2 to 3 functional groups and a viscosity of 5,000 to 30,000 cps, or

iii) (A) 0-30 wt% of ethylene oxide, 70-100 wt% of propylene oxide, 400-7,000 polyether polyol, and (B) 20-60 wt% of solid content of polyvinyl compound Polyether polyol and (C) a polyol synthesized by condensation polymerization of an alcohol and an acid, and using a polyester polyol having a functional group of 2 to 3 and a viscosity of 5,000 to 30,000 cps.

In each of the polyols i), ii) and iii), a mixed catalyst of tin octylic acid and dibutyl dilaurate and a resin premix comprising an amine catalyst are reacted with an aliphatic and alicyclic isocyanate modified with reactivity. The present invention relates to a method for producing a flexible urethane having excellent yellowing resistance.

Soft polyurethane is widely used for cushioning materials, clothing products, footwear materials, medical use, etc. because of the ability to implement a variety of physical properties and inherent elastic and lightweight.

However, since general polyurethane foam mainly uses toluene diisocyanate (TDI) or diphenylmethane diisocyanate (MDI), which are aromatic compounds, the appearance of yellow or brown color is changed to azo compound structure or quinone imide structure by light. Will form. This does not directly cause a large drop in physical properties, but gives an impression of appearance, which lowers the purchasing power of some products. Therefore, in order to delay such yellowing, UV stabilizers and absorbents may be added in urethane synthesis, but the yellowing phenomenon cannot be prevented at the source without precluding the aromatic isocyanate which is the main cause of the yellowing phenomenon. Such a yellowing phenomenon is known that the isocyanate can be prevented by synthesizing urethane using aliphatic or alicyclic isocyanate.

Egg yolk polyurethane technology using aliphatic or cycloaliphatic isocyanates is not widely known in the field of flexible urethanes, and in particular, is known as a technique for low density foams having a density of 50 kg / m ³ or less. However, representative conventional techniques of yolk-urethane polyurethane foam including a high density foam manufacturing method having a density of 50 kg / m ³ or more include Japanese Patent Publication No. 52-030437, Japanese Patent Publication No. 54-015599, and Japanese Patent Publication No. 54-162795 Japanese Patent Application Laid-Open No. 4-239016, Japanese Patent Application Laid-Open No. 2000-226429, Japanese Patent Application Laid-Open 2000-273136, Japanese Patent Publication No. 2001-72738, Japanese Patent Publication No. 2001-278942, US Patent No. 4,067,832 US Patent No. 6,031,013, US Patent No. 6,191,179, US Patent Publication No. 2002/0035165, and the like.

Japanese Patent Publication No. 52-030437 describes a technique for improving weather resistance while maintaining physical properties of a polyurethane foam by using a catalyst specific to aliphatic or alicyclic isocyanates, and Japanese Patent Publication No. 54-015599 describes as isocyanate. A method of obtaining the color stability of polyurethanes using polyisocyanates in which NCO groups are not directly bonded to aromatic rings and certain catalysts is described.

Japanese Patent Application Laid-Open No. 54-162795 discloses at least one compound selected from the group consisting of hydroxides, alcoholates or phenolates of alkali metals, alkali metal salts of weak acids or hexahydrotriazine-S-derivatives with respect to aliphatic or alicyclic polyisocyanates. A polyurethane having improved light stability, that is, improved yellowing due to light, is disclosed by using at least one compound selected from organic compounds such as zinc or iron.

Japanese Patent Application Laid-Open No. 2001-72738 discloses yellowing-free yellowing with an oxyethylene content of 18% by weight or less and an aliphatic polyisocyanate reacted and cured in the presence of a specific catalyst in an aqueous solution containing 0.5% by weight of an alkaline detergent. A method for producing a polyurethane foam is described.

U.S. Patent No. 4,025,466 discloses diethylene glycol / adipate polyester polyols or polyether polyols, isophorone diisocyanate or hydrogenated diphenylmethane diisocyanate, diazabicycloalkenes and metal carboxyl. A method for producing a low density soft foam having a density of 27 to 37 kg / m ³ using a catalyst in combination with an acid salt is disclosed.

U.S. Pat.No. 6,031,013 discloses isocyanates of biuret or isocyanurate structure with a catalyst of polyol mixtures of 400-8,000 molecular weight, blowing agents, metal salts and amine mixtures containing polyols having a primary hydroxyl group of at least 50%, and at least 40 ° C. Reaction was carried out to produce a yolk yellow furniture foam having a density of 50 ~ 80g / ℓ. U.S. Pat.No. 6,191,179 discloses a polyol mixture having a molecular weight of 400 to 8,000 comprising at least one isocyanate of a biuret or isocyanurate structure and at least one polyol having a primary hydroxyl group of at least 50%, a compound having a primary amine group, for example diethanol An amine, an N, N-dimethylpropylene diamine, a blowing agent, tin, and a tertiary amine catalyst were reacted at 25 to 35 ° C to prepare a foam having a density of 30 to 78 g / L.

U.S. Patent Publication No. 2002/0035165 describes the addition of acrylate polyols to compensate for the poor physical properties of aliphatic or cycloaliphatic isocyanate foams.

In addition, Korean Patent No. 0525352 has a composition ratio of tin octylic acid and dibutyl dilauric acid in a ratio of 1: 0.5 to 10% by weight based on the weight of polyol, and a polycarboxylic acid catalyst of 0.05 to 5% by weight. Techniques for preparing urethanes are described.

Sulfur-resistant urethanes are produced by the reaction of aliphatic or cycloaliphatic isocyanates, but due to their low reactivity, excessive reactivity is increased with an excess of catalyst, resulting in an unstable foam profile. In addition, the resulting urethane foam is not completely completed the urethane resin reaction is weak or unstable polymer chain collapse, or the elasticity and durability of the foam produced is lower than the foam using the conventional aromatic isocyanate. In order to overcome this problem, it is an object to optimize the polyol constituents and isocyanates, to provide a yellowing foam having excellent elasticity and durability.

The present invention provides a method for producing a flexible polyurethane foam,

i) (A) 10 to 90% by weight of ethylene oxide content, 70 to 100% by weight of propylene oxide, molecular weight 400 to 7,000, and 10 to 90% by weight of (B) polyvinyl compound Polyol containing 10 to 90% by weight of polyether polyol containing 20 to 60% by weight,

(C) a polyester polyol synthesized by condensation polymerization of an alcohol and an acid, having a functional group of 2 to 3, and a viscosity of 5,000 to 30,000 cps, or

(A) 5 to 90% by weight of an ethylene oxide content of 0 to 30% by weight, a propylene oxide content of 70 to 100% by weight, a polyether polyol having a molecular weight of 400 to 7,000, and (B) a solid content of a polyvinyl compound of 20 to 20% 5 to 90% by weight of polyether polyol containing 60% by weight and (C) alcohol and acid are synthesized by condensation polymerization, and includes 2 to 3 functional groups and 1 to 80% by weight of polyester polyol having a viscosity of 5,000 to 30,000 cps. Polyol

100 parts by weight of each polyol;

0.1-2.5 parts by weight of crosslinking agent; 0.5-5.0 parts by weight of octylic acid tin; 1.0-10 weight part of dibutyl tin dilaurate; 0.5-5.0 parts by weight of amine catalyst; 0.2 to 3 parts by weight of the silicone foam stabilizer; And 0.2 to 5 parts by weight of a blowing agent; and a resin premix

Provided is a method for producing a flexible urethane having excellent yellowing resistance by reacting aliphatic and alicyclic isocyanates in the range of isocyanate index 90 to 130.

Hereinafter, the present invention will be described in more detail.

The polyol used in the present invention is (A) polyether polyol having a molecular weight of 400 to 7,000, preferably a functional group having 2 to 5 functional groups and an ethylene oxide content of 0 to 30% by weight, and a propylene oxide content of 70 to 100% by weight. 30 to 50 solids in the form of copolymers containing 2 to 3 and 10 to 20% by weight of ethylene oxide, a copolymer of a polyether polyol having a molecular weight of 400 to 7,000, an acrylonitrile and a styrene monomer (B) vinyl compound It is preferable to mix and use the polyether polyol which is weight%. It is preferable to contain the mixing ratio of (A) and (B) of the said polyol in 10-90: 90-10 weight%.

(C) polyester polyol can be used as a polyol component used by this invention other than said (A) and (B) polyether polyol. The polyester polyol is synthesized by condensation polymerization of an alcohol and an acid, and the alcohol may include trimethylpropanol, dipropyl glycol, tripropyl glycol, propyl glycol, diethyl glycol, ethyl glycol, and the like. And terephthalic acid, adipic acid, dimethyl acid and the like. The polyester polyol synthesize | combined by condensation polymerization of the said alcohol and an acid is 2-3 of functional groups, and it is preferable that it is a viscosity of 5,000-30,000cps.

Furthermore, the polyol of this invention can mix and use the said (A), (B) and (C) polyol. At this time, it is preferable to mix and use the mixing ratio of each polyol (A), (B), and (C) in the ratio of 5-90: 5-90: 1-80.

In producing the yolk yellow soft polyurethane foam of the present invention, aliphatic and cycloaliphatic isocyanates may be prepared by reacting with a resin premix containing the polyol and other additives such as catalysts in the range of isocyanate index 90 to 130.

The aliphatic or cycloaliphatic isocyanates which can be used in the present invention include 1,6-hexamethylene diisocyanate, isophorone diisocyanate, methylene dicyclo hexisocyanate, hydrogenated 4,4'-diamino diphenylmethane, lysine diisocyanate, And monomers or oligomers of 2,5 (2,6) -bis (isocyanatomethyl) bicyclo (2.2.1) heptane. Among these, monomers or oligomers of 1,6-hexamethylene diisocyanate, isophorone diisocyanate, or 2,5 (2,6) -bis (isocyanatomethyl) bicyclo (2.2.1) heptane can be used. . Aliphatic isocyanate and cycloaliphatic isocyanate are used at a ratio of 5 to 90: 10 to 95 equivalent%, preferably, 20 to 50: 50 to 80 equivalent%, where appropriate blowing reaction and gelling Balance of the reaction can be obtained, which is desirable for stable production of foam.

Crosslinking agents used in the present invention include ethylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, propylene glycol, dipropylene glycol, tripropylene glycol, 1,4-butanediol, diethyl toluene diamine, glycerin, diethanol amine , Triethanol amine, diol having a molecular weight of 2,000 or less, triol, tetraol, or a mixture selected from one or two or three can be used. Preferably, ethylene glycol, diethylene glycol, propylene glycol, 1,4-butanediol, Diethyl toluene diamine, glycerin, diethanol amine and triethanol amine may be used alone or in a mixture of 0.1 to 2.5% by weight. If the content of the cross-linking agent is included in excess of the above range, the generation of independent bubble rate is significantly increased to narrow the stable production range of the foam is not preferable.

It is preferable to use a tin catalyst and an amine catalyst simultaneously as a catalyst of the resination reaction of this invention in order to produce the synergy effect of resination reaction. Examples of the tin catalyst include tin octylate and dilauric dibutyl tin catalyst, and it is preferable to use these together. These tin catalysts are preferably used in the range of 0.2 to 10.0 parts by weight of tin octylate, and in the range of 0.2 to 10 parts by weight of dilauric dibutyl tin catalyst in order to produce stable foams.

Further, as the amine catalyst, a strong blowing catalyst and a balance catalyst are mixed and used. Specifically, triethylene diamine, triethylamine, bis (dimethylaminoethyl) ether, N, N, N'- Trimethylaminoethylethanolamine, bis (N, N-dimethylaminoethyl) ether, N, N'-dimethylpiperazine, pentamethyldipropyltriamine, 1,8-diazabicyclo (5,4,0) undecane -7, N- (N ', N'-2-dimethylaminoethyl) morpholine, tri (dimethylaminemethyl) phenol, 33 wt% triethylene diamine dissolved in dipropylene glycol and the like can be used. It is preferable to use the said amine catalyst in the range of 0.5-1.0 weight part. If the amount is less than 0.5 parts by weight, the blowing reaction of the foam is delayed, and the underruning or shrinkage of the process is likely to occur, and if it is more than 5.0 parts by weight, the foam is likely to collapse or split.

In addition, the silicone foam stabilizer of the present invention may be a commercially available product, specifically, L-580, L-600, L603, L-3002, L-626, L-627 or Air Products Co., Ltd. DABOC DC -198, DC-5230 DC-5388 or Degussa BF-2370, B4900, B-8002, B-8680 is selected, preferably L-626, DC-198, B-8002 alone or mixed 0.5 ~ 4.5% by weight can be used. Using an excessive amount of silicon foam stabilizer outside the above range generates a large number of independent bubbles, which adversely affects the elongation or durability of the foam. If used too little, foam collapse or splitting may occur. However, if necessary, in a pore-forming reaction or a formulation with a large amount of blowing agent, the amount of silicone may be increased to foam.

Further, as the blowing agent, water, methylene chloride, liquid carbon dioxide, n-pentane, hydrogenated chloro fluoro carbon may be used depending on the use and density. The content of the blowing agent is preferably used in the range of 0.2 to 5 parts by weight.

In addition, the polyurethane foam using aliphatic or cycloaliphatic isocyanate is excellent in yellowing resistance, but yellowing may occur due to the additive to be used. Therefore, it is preferable to add an appropriate UV stabilizer and anti-aging agent. The UV stabilizer and anti-aging agent is not particularly limited as long as it is commonly used in the field of the present invention.

Example

Hereinafter, an Example is given and this invention is demonstrated concretely. However, the present invention is not limited by the following examples.

Example  One

Resin premixes were prepared using polyols, water, crosslinkers, catalysts, foam stabilizers and stabilizers in the amounts as set forth in Table 1 below. The resin premix was mixed with diisocyanate at index 110 and stirred at 5,000 rpm for 8 seconds to produce a flexible urethane foam. Diisocyanate is a mixed liquid with an equivalent ratio of 5: 5 of 1,6-hexamethylene diisocyanate and isophorone diisocyanate.

Example  2 ~ 4

The diisocyanate used in Examples 2 to 4 was the same as that used in Example 1 above. In addition, in Example 2, the type of amine catalyst was changed, and in Examples 3 and 4, the polyurethane foam was prepared in the same manner as in Example 1 except that the amount of water was changed to increase the type and density of polyol B and the amount of the crosslinking agent. Prepared. The composition and content of the polyurethane foam used in each of Examples 2 to 4 are shown in Table 1 below.

Example  5

Polyurethane foams were prepared in the same manner as in Example 1 using ester polyols as polyols. The composition and content of the polyurethane foam used are shown in Table 1 below.

Example  6

Polyurethane foams were prepared in the same manner as in Example 1 using polyols A, B and C mixed as polyols. The composition and content of the polyurethane foam used are shown in Table 1 below.

Comparative example  1 to 3

In Comparative Examples 1 and 2, isophorone diisocyanate was used as the diisocyanate, and toluene diisocyanate-80 was used in Comparative Example 3. In Comparative Example 1, only polyether polyol having no polyvinyl solids was used, and only isophorone diisocyanate was used alone. In Comparative Example 2, aliphatic isocyanate was used as isophorone diisocyanate alone to compare foam properties. . In Comparative Example 3, toluene diisocyanate-80 was used, and a low yellowing polyurethane foam was prepared in which yellowing was delayed by adding a light stabilizer.

Except as described above, a flexible polyurethane foam was prepared in the same manner as in Example 1. The compositions and contents of Comparative Examples 1 to 3 are shown in Table 1 below. The unit of each component of following Table 1 is a weight part.

Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Comparative Example 1 Comparative Example 2 Comparative Example 3 Polyol A 90 90 80 60 - 60 100 90 100 Polyol B 10 10 20 40 - 20 0 10 0 Polyol C 100 20 water 3.0 3.0 2.5 2.5 3.0 3.0 3.0 - 0.2 Crosslinking agent One 0.8 0.8 - 0.5 0.5 0.3 0.8 - 0.2 2 - - 0.8 - - - - - -    catalyst One 0.4 0.5 0.5 0.5 0.5 0.2 0.4 0.3 0.1 2 0.2 - 0.2 0.2 0.2 0.1 0.2 - 0.2 3 - 0.3 - 0.3 - - - 0.3 - 4 1.0 2.0 0.5 - - - 1.0 - - 5 0.4 1.1 1.5 1.5 1.5 1.0 0.4 - 0.3 6 0.5 0.5 1.0 1.5 1.5 1.5 0.4 - - 7 1.0 1.5 2.0 2.0 1.5 1.5 1.0 - 1.0 Foam stabilizer 1.5 1.5 1.3 1.3 1.2 1.2 0.8 1.5 0.8 stabilizator - - - 2.0 - - - - 2.0 Isocyanate Index 110 110 110 110 105 105 110 110 110

The specific description about each component, such as the polyol used in Examples 1-5 and Comparative Examples 1-3, is as follows.

Polyol A: polypropylene glycol having an average molecular weight of 3,500 (hydroxyl value of 48 mgKOH / g) and an EO content of 11% by weight (YUKOL4813 of Escei's)

Polyol B: Polypropylene glycol having a solid content of 25% by weight of the copolymerized polymer of acrylonitrile and styrene monomer (YUKOL 1564 by Escei)

Polyol C: ester polyol having a functional number of 2.7 and a viscosity of 20,000 (Bayer Desmophen 2200)

Crosslinking agent 1: 1,4-butadiene

Crosslinker 2: Ethylene Glycol

Catalyst 1: Bis (dimethylaminoethyl) ether

Catalyst 2: Triethylenediamine

Catalyst 3: 33 wt% triethylenediamine dissolved in dipropylene glycol

Catalyst 4: pentamethyldipropylenetriamine

Catalyst 5: 1,8-diazabicyclo (5,4,0) undecane-7

Catalyst 6: Octyl Acid Tin

Catalyst 7: Dibutyl Dilaurate

Defoamer: L-626 of Giza

Stabilizer: Tinuvin B 75 from Ciba Specialty Chemicals

Isocyanate In Examples 1, 2, 3, 4, and 5, a mixed solution of 5: 5 having an equivalent ratio of 1,6-hexamethylene diisocyanate and isophorone diisocyanate was used. In Comparative Examples 1 and 2, isophorone diisocyanate was used alone.

Aromatic Isocyanates: Toluene diisocyanate-80 was used in Comparative Example 3.

Reactivity and Foam Property Test

When urethane foaming, the cream time (seconds) and rise time (seconds) were measured with a stopwatch to evaluate the reactivity, and foam stability was determined by visually observing the degree of sinking after the foam reached its maximum height during foaming. In addition, elasticity and durability were measured by ASTM D3574, respectively. The results are shown in Table 2 below.

Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Comparative Example 1 Comparative Example 2 Comparative Example 3 Cream Time (Seconds) 30 26 25 20 15 15 33 20 10 Rise time (seconds) 178 146 152 146 150 140 168 115 95 Density (kg / m ³ ) 30.2 30.5 33.5 34.1 32.1 31.9 30.1 30.2 30.5 Shout(%) 30 31 34 34 28 30 16 24 33 Durability (comp.set) 7 8 3 4 3 5 35 25 5

When comparing Example 1 and Comparative Example 2, it can be seen that the elasticity and durability of the flexible polyurethane foam according to Example 1 was increased sharply compared to Comparative Example 2. In addition, it can be seen that even if the content of polyol B is increased, elasticity and durability are maintained.

Yellowing degree  exam

The soft urethane foams obtained in Example 1 and Comparative Example 3 were placed in a light resistance tester (manufactured by Kyung-King Co., Ltd.), and yellowed according to the method specified in ASTM E313-96 and ASTM D1925 for 10 hours for 0 to 40 hours. indes) was measured. At this time, the light source of the light resistance tester was an Osram solar lamp of 300W. The results are shown in FIG.

1 is a graph showing the yellowing degree of the flexible polyurethane foam obtained in Example 1, Comparative Example 3 and the like of the present invention. In FIG. 1, Y1 represents yellowness, and a lower value means lower yellowness. In the case of the flexible polyurethane foam prepared in Example 1, it can be seen that there is no change in the yellowing value over time.

Urethane prepared by the method of the present invention has stable moldability, elasticity and durability, and has a yellowing resistance even when exposed to light for a long time, so that conventional aromatic isocyanates used in clothing, hygiene products, packaging materials, medical products, automobile products, etc. It can replace the urethane using.

Claims (10)

In the method of manufacturing the flexible polyurethane foam, Polyether polyol containing 0 to 30% by weight of ethylene oxide, 70 to 100% by weight of propylene oxide, 10 to 90% by weight of polyether polyol having a molecular weight of 400 to 7,000, and 20 to 60% by weight of solid content of polyvinyl compounds 100 parts by weight of a polyol including 10 to 90% by weight; 0.1-2.5 parts by weight of crosslinking agent; 0.5-5.0 parts by weight of octylic acid tin; 1.0-10 weight part of dibutyl tin dilaurate; 0.5 to 5.0 parts by weight of an amine catalyst; 0.2 to 3 parts by weight of the silicone foam stabilizer; And 0.2 to 5 parts by weight of blowing agent; Resin premix and aliphatic and cycloaliphatic isocyanate containing a method for producing an egg yolk soft polyurethane foam characterized in that the reaction is carried out in the range of isocyanate index 90 ~ 130. In the method of manufacturing the flexible polyurethane foam, 100 parts by weight of a polyester polyol synthesized by condensation polymerization of an alcohol and an acid and having 2 to 3 functional groups and a viscosity of 5,000 to 30,000 cps; 0.1-2.5 parts by weight of crosslinking agent; 0.5-5.0 parts by weight of octylic acid tin; 1.0-10 weight part of dibutyl tin dilaurate; 0.5 to 5.0 parts by weight of an amine catalyst; 0.2 to 3 parts by weight of the silicone foam stabilizer; And 0.2 to 5 parts by weight of blowing agent; Resin premix and the aliphatic and cycloaliphatic isocyanate containing a method of producing an egg yolk soft polyurethane foam to react in the range of isocyanate index 90 ~ 130. In the method of manufacturing the flexible polyurethane foam, Polyethylene containing 0 to 30% by weight of ethylene oxide, 70 to 100% by weight of propylene oxide, 5 to 90% by weight of polyether polyol having a molecular weight of 400 to 7,000, and a solid content of 20 to 60% by weight of polyvinyl compound 100 parts by weight of a polyol comprising 5 to 90% by weight of an ether polyol and 1 to 80% by weight of a polyester polyol having a functional group of 2 to 3 and a viscosity of 5,000 to 30,000 cps; 0.1-2.5 parts by weight of crosslinking agent; 0.5-5.0 parts by weight of octylic acid tin; 1.0-10 weight part of dibutyl tin dilaurate; 0.5 to 5.0 parts by weight of an amine catalyst; 0.2 to 3 parts by weight of the silicone foam stabilizer; And 0.2 to 5 parts by weight of blowing agent; Resin premix and the aliphatic and cycloaliphatic isocyanate containing a method of producing an egg yolk soft polyurethane foam to react in the range of isocyanate index 90 ~ 130. The method of claim 2 or 3, The alcohol is at least one selected from the group consisting of trimethylpropanol, dipropylglycol, tripropylglycol, tripropylglycol, propylglycol, diethylglycol and ethylglycol, the acid from the group consisting of terephthalic acid, adipic acid and dimethyl acid Method for producing a yolk yellow soft polyurethane foam characterized in that at least one selected. The method according to any one of claims 1 to 3, A method for producing an egg yolk soft polyurethane foam, wherein the equivalent ratio of the aliphatic isocyanate and the alicyclic isocyanate is 5 to 90: 10 to 95 equivalent%. The method according to any one of claims 1 to 3, The aliphatic isocyanate is at least one selected from the group consisting of 1,6-hexamethylene diisocyanate, hydrogenated 4,4'-diamino diphenylmethane, and lysine diisocyanate, and the alicyclic isocyanate is isophorone diisocyanate, methylene A method for producing an egg yolk soft polyurethane foam, which is dicyclohex isocyanate and 2,5 (2,6) bis (isocyanatomethyl) bicyclo (2,2,1) heptane. The method according to any one of claims 1 to 3, The crosslinking agent is ethylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, propylene glycol, dipropylene glycol, tripropylene glycol, 1,4-butanediol, diethyl toluene diamine, glycerin, diethanol amine, triethanol amine, molecular weight A method for producing a yolk yellow soft polyurethane foam, characterized in that one, two, or three selected from 2,000 or less diols, triols and tetraols. The method according to any one of claims 1 to 3, The amine catalyst is triethylene diamine, triethylamine, bis (dimethylaminoethyl) ether, N, N, N'-trimethylaminoethylethanolamine, bis (N, N-dimethylaminoethyl) ether, N, N'- Dimethylpiperazine, pentamethyldipropyltriamine, 1,8-diazabicyclo (5,4,0) undecane-7, N- (N ', N'-2-dimethylaminoethyl) morpholine, tri ( Dimethylamine methyl) phenol, at least one selected from the group consisting of 33% by weight of triethylene diamine dissolved in dipropylene glycol. The method according to any one of claims 1 to 3, The foaming agent is a method for producing a yolk yellow soft polyurethane foam, characterized in that selected from the group consisting of water, methylene chloride, liquid carbon dioxide, n- pentane, chlorofluorocarbons. delete

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