KR20100031707A - A non-yellowish polyurethane foam and a manufacturing mehtod thereof - Google Patents

Abstract

PURPOSE: A method for preparing non-yellowing urethane foam is provided to maintain a reaction rate while not using an excess of catalyst, to impart molding stability of foam, and to prepare non-yellowing foam with good cell open property and discoloration resistance. CONSTITUTION: A method for preparing non-yellowing urethane foam comprises a step of mixing a resin premix with isophorone diisocyanate to make foam. The resin premix comprises polyether polyol with an OH functional group of 3-8 and average molecular weight of 3,000 - 9,000, cross-linking agent, surfactant, diazabicycloalkene, and catalyst system. The alkene is undecene, decene, or nonene.

Description

Yellow-free urethane foam and its manufacturing method {A NON-YELLOWISH POLYURETHANE FOAM AND A MANUFACTURING MEHTOD THEREOF}

The present invention relates to a yellowing-free urethane foam and a method for producing the same, and more particularly, to a low-density yellowed urethane foam for a slab and a method for producing the same.

Since general polyurethane foam uses toluene diisocyanate or diphenylmethane diisocyanate, which is aromatic isocyanate, UV (10% or less) irradiation with wavelength of 290 to 400 nanometers emitted from sunlight has a chromophore structure. Yellowing occurs by changing to monoquinone imide and diquinone imide structures. Since the urethane foam by UV irradiation gives a deterioration in appearance as well as deterioration of physical properties, product value as a product is lowered. The method for removing yellowing can be minimized by using UV stabilizer, pigment addition and aliphatic isocyanate. UV stabilizer and pigment addition give temporary discoloration stability, so it is required to use aliphatic isocyanate which can prevent semi-permanent discoloration. .

The main use of the yellowing-free polyurethane foam made from aliphatic isocyanate is used for cushioning of expensive garment bra pads, shoe pads, packaging products, etc. For other non-foaming, automobile crush pad skin coating material, hydroponic surface coating material It is used for various uses, such as a shoe adhesive and a white ink binder.

The composition of the yellowing-free polyol system used in the production of polyurethane foams is a known material, the basic patents of which are US Patent Nos. 3,897,581, 3,919,173, 5,147,897, European Patent 0,423,621 A2, Japanese Patent No. 61-7322, Sub 59 -168020, Pyeong 2-255817, Pyeong 11-28554 and the like.

Japanese Patent No. Hei 11-28554 discloses an IPDI trimer with NCO% 17 and an IPDI with NCO% 33.6 as a mixture of 20/80 and a mixture of HDI trimer (NCO% = 21.3 ) Isocyanates, ester polyols having a molecular weight of 2200, ether polyols having a molecular weight of 4800, active catalysts such as diazabicyclonealkene catalysts, phenol salts or octanoic acid salts, amine catalysts such as BL-19, and AX-31. The yellowing system preparation using the surfactant was described.

In addition, European Patent 0,423,621, A2 is an isocyanate used as a patent for the development of foam foam having a molding density of 21 Kg / m ^{3 that} is stable to UV discoloration in the development of garment pads such as shoulder pads, bra pads, elbow pads and knee pads. It is reported that the aliphatic isocyanate (HDI (Hexamethylene diisocyanate), IPDI (Isophorone diisocyanate), XDI (Xylene diisocyanate), HMDI (4,4-dicyclohexylmethane diisocyanate), CMDI (1,4-Cyclohexyl diisocyanate), etc. As a result, low density non-yellowing foams are advantageous for low density molding of IPDI or HDI having high NCO%, which is superior to HMDI or CMDI having low NCO%.

U.S. Patent No. 5,147,897 describes a method for preparing a sulfur-free foam system using a high activity catalyst and a foaming agent in a prepolymer based on aliphatic isocyanates (Hexamethylene diisocyanate) and PEG (Polyethylene glycol). However, the formulation has a higher molding density than the foams that are commercially available, because the low NCO% of the prepolymer makes it difficult to manufacture low density foams. The system using the prepolymer as a raw material has described that the reaction rate is uniform during foam foaming so that the molding stability of the foam is excellent. Japanese Patent No. 61-7322 describes a method for producing a high density foam having a molding density of 600 Kg / m ³ using CFC as a blowing agent, and Japanese Patent No. 59-168020 describes a molding density of 700 Kg / m ³ using IPDI, HDI, HMDI and CFC. The yellowing semi-rigid polyurethane foam was described for the manufacturing method.

The molding density of urethane foam used as the bra pad for clothes is mainly from 30Kg / m ³ to 45Kg / m ^3. Therefore, development of high-density yellowing products using prepolymer with excellent molding conditions is difficult to commercialize in terms of cost. There is this.

A low density non-yellowing form patents for the current commercialized molding density 30-40 Kg / m ³ is Japanese Patent No. Hei 2-255817 and Korean Patent Application 10-2004-0110697 In forming a mixture of water and water alone prescription and CFC as foaming agent The development of a low density yellowing system with a density of 29 to 31 Kg / m ³ was described. The above-described patents cause problems such as odor problems and fogging properties due to the use of highly active catalysts and excess amine catalysts due to the reactivity problems of aliphatic isocyanates, and even greater changes are caused by slight changes in conditions in the continuous foaming process. It causes a problem of foam molding stability due to the change in reactivity. Therefore, until now, the development of low-density yellowing system for low density has been difficult to secure stable formability due to the use of excess catalyst.

Accordingly, there is a continuing need for a low density non-yellowing foam manufacturing method that can maintain the reaction rate without providing an excess of catalyst and also provide the molding stability of the foam.

It is an object of the present invention to provide a method for producing a yellowing foam that can maintain the reaction rate without using an excess of catalyst and can provide the molding stability of the foam.

Another object of the present invention is to provide a low density yellowing foam manufacturing method which can maintain the reaction rate without using excess catalyst and can provide the molding stability of the foam.

It is still another object of the present invention to provide a low density yellowing foam having good structure, openness, and discoloration resistance.

Still another object of the present invention is to provide a resin premix for preparing a yellowed foam, which can maintain a reaction rate without using an excess catalyst and can provide molding stability of the foam.

Still another object of the present invention is to provide a polyurethane foam having no fogging problem and odor problem, strong discoloration resistance, and improved elasticity and other mechanical properties.

In order to achieve the above object, the method for preparing a yellowed foam of the present invention is a polyether polyol, a crosslinking agent, a foaming agent, and a diaza bicycloalkene and an organic tin catalyst having an OH functional group of 3 to 8 and a molecular weight of 3,000 to 9,000. It is characterized in that the resin premix comprising a mixed foam with aliphatic or alicyclic diisocyanate.

In the present invention, the polyether polyol is not limited in theory, but it is preferable to use a high-functional polyol so as to prevent the use of an excessive catalyst due to a decrease in the reaction rate with aliphatic diisocyanate. High molecular weight polyols are recommended to prevent collapse.

In the present invention, the high functional and high molecular weight polyether polyols have an OH functional group of 3-8, more preferably 4-7, even more preferably 4.5-6, the molecular weight is 3,000-9,000 This is good. When the OH group of the polyether polyol is less than or equal to 3, problems of decay and permanent compression strain and hardness reduction may occur, and in the case of 8 or more, there are problems such as foam shrinkage and hardness increase. In addition, when the molecular weight is less than 3,000, there is a problem that the foam hardness rises and the molding width of the foam is narrowed, and when the molecular weight is 9,000 or more, problems such as flowability and moldability due to the decrease in hardness and the viscosity increase during the urethane reaction may occur.

In the practice of the present invention, the polyether polyol is a polyhydric alcohol such as pentaerythritol, sorbitol, sorbitol diether, mannitol, mannitol diether, arabitol, arabitol diether, sucrose, sucrose and glycerin mixture High functional polyols having at least trivalent hydroxyl groups can be prepared by reacting ethylene oxide and / or propylene oxide with an initiator and can be prepared by known methods.

In a preferred embodiment of the present invention, the content of ethylene oxide in the polyether polyol is preferably used in 10-20% by weight, when the content is less than 10% by weight increase the amount of catalyst used and foaming due to the reaction rate and curability deterioration problem It may affect the molding stability during processing, and if the ethylene oxide content is 20 parts by weight or more, there is no effect on reactivity, curability, and the like.

In another embodiment of the present invention, in order to further increase the reactivity of the polyether polyol, an amine terminated polyol having a terminal treated with an amine group may be used. Termination of the amine at the end can be accomplished through conventional methods. Amine terminated polyols can be purchased commercially and used.

In the present invention, the crosslinking agent is introduced to improve the foam shrinkage problem due to the foaming stability and the synergistic synergistic effect of the foam and to promote the hardenability, and to increase the amount of isocyanate by using a low molecular weight crosslinking agent, 1,4 butanediol, ethylene One or two or more selected from glycols, glycerin, diethylene glycol, triethylene glycol, triethanol amine, diethanol amine, and monoethanol amine can be used, and preferably ethylene glycol, 1,4 butanediol, di It is preferable to use ethanol amine, monoethanol amine, etc. alone or in combination. In a preferred embodiment of the invention, the crosslinking agent is preferably used in the range of 1-10 parts by weight based on 100 parts by weight of the polyether polyol.

In the present invention, the foam stabilizer is used to control the cell uniformity and the size of the foam, it is preferable to use a silicone foam stabilizer. In the practice of the present invention, the silicone foam stabilizer is preferably used in an amount of 0.1-3 parts by weight with respect to 100 parts by weight of the polyol, and may cause foam shrinkage when the amount is excessively used. In the practice of the present invention, the foam stabilizer can be purchased commercially and used, for example, B8002, B4900, B8128, B8462, B8123 from Demi Corp. of Goldsmith or DABCO DC 193, DC 5043, DC 5388 from Air Products Co. , DC 5169, or L580, L5740M, L6900, L2100, L3002, etc. may be used.

In the case of using the polyether polyol according to the present invention, it is preferable to use a mixture of a strong foaming agent and a weak foaming agent in order to form an open cell and increase the openness of the cell to prevent shrinkage of the slab foam. A mixture of B 4900 and DC193 foam stabilizers may be used.

In the present invention, it is preferable that the catalyst system uses a high activity catalyst in order to prevent a decrease in reactivity with aliphatic or alicyclic diisocyanate during foam formation. In the practice of the present invention, the high activity catalyst system is an organic metal catalyst, preferably an organic tin catalyst, or an organic lead catalyst mixed with a diazabicycloalkene catalyst.

In a preferred embodiment of the invention, the mixed catalyst is a single mixed catalyst composed of dimethyl tin and 1,8-diazabicycloalkene without using an amine catalyst which causes UV discoloration problems and problems such as fogging and odor. The catalysts are 0.2 to 5 parts by weight of the dimethyl tin catalyst, more preferably 0.5 to 3 parts by weight, and 0.2 to 2.0 parts by weight of the mixed catalyst of diazabicycloalkene with respect to 100 parts by weight of the polyol. It is used in the range of ~ 1.0 parts by weight. When the amount of the catalyst is excessive, there may be a problem such as the difference of the cell size of the foam foam, that is, the slab top, the stop, the bottom of the slab, and the increase in the close cell content. Increasing cell size due to foam stability and severe moldability such as foam collapse may occur.

In a preferred embodiment of the present invention, the method for producing a yellowed foam of the present invention is a polyether polyol having an OH functional group of 3-8 and a molecular weight of 3,000-9,000; A resin premix comprising 0.1-10 parts by weight of the crosslinking agent and 0.01-5.0 parts by weight of each of the 1,8-diaza bicycloalkene and the organic tin catalyst is mixed with an aliphatic diisocyanate and foamed.

In the present invention, the aliphatic or alicyclic diisocyanate isophorone diisocyanate, isophorone diisocyanate prepolymer, 1,6-hexamethylene diisocyanate, hydrogenated xylene diisocyanate, hydrogenated 4,4 'diaminodiphenylmethane It is preferable to use isophorone diisocyanate which can be used, and is excellent in molding stability and reactivity. In a preferred embodiment of the present invention, the yellowing foam has an index index of isocyanate of 100 to 110, and most preferably 105.

In the present invention, foaming agents used in the manufacture of foams include water, hydrochlorinated fluorocarbons (hereinafter referred to as HCFC), cyclopentane, methylene chloride, etc. The blowing agents may be used alone or in a mixture of two or more. The amount used as the blowing agent is preferably 0.1-5 parts by weight with respect to 100 parts by weight of polyol in the case of water, and the amount of other blowing agents is used in an amount of about 1-20 parts by weight.

In the present invention, polyurethane foams using aliphatic or cycloaliphatic diisocyanates are generally excellent in yellowing resistance, but are poor in heat resistance and ultraviolet stability, resulting in deterioration of physical properties, and thus suitable commercially available antioxidants, heat stabilizers, light stabilizers, and the like. It is preferable to add an additive.

In the practice of the present invention, the antioxidant is preferably used in the range of 1 to 10 parts by weight in order to prevent discoloration of the foam, and commercial antioxidants can be purchased commercially. For example, PUR68, I1135, I5057 series from Ciba Special, and FAO2, FAO3 from Zico are available.

In an aspect, the present invention provides a polyether polyol in which the yellowing foam has an OH functional group of 3-8 and a molecular weight of 3,000-9,000; Crosslinking agents; Foam stabilizers; And a resin premix including the catalyst system is mixed and foamed with aliphatic or alicyclic diisocyanate.

In the present invention, the non-yellowing foam has good foam stability and can be suitably used for low density applications, in particular, foam applications for slabs where foam stability and shrinkage resistance are important because of the large size of molded articles, and diisocyanate isophorone diisocyanate. It is good to use

The present invention, in one aspect, 100 parts by weight of a polyether polyol having a OH functional group 3-8 and a molecular weight of 3,000 to 9,000, a crosslinking agent 0.1-10 parts by weight, 0.1-10 parts by weight of the foam stabilizer And 1,8-diaza bicycloalkene and an organic tin catalyst, each 0.01-5.0 parts by weight.

Hereinafter, the present invention will be described in detail through examples. It will be appreciated by those skilled in the art that the following examples are used to illustrate the invention and should not be construed as limiting the invention in any case.

The yellowing-free polyurethane product prepared by the present invention has been provided as a product having excellent foaming stability and foam openability by using a high molecular weight, high functional polyol, and a small amount of excellent catalyst and foam stabilizer. In addition, yellowing does not occur even when exposed to light for a long time, and changes in foam physical properties at light and high temperature have superior characteristics compared to competitors' products.

Example

In the present invention, the compounds used in the yellowing system, the symbol and the description of the concept are as follows.

Polyol A: A polyol obtained by reacting 15 wt% of propylene oxide and ethylene oxide with a sorbitol initiator. OH.value: 29, average molecular weight: 9,100 (GPC), viscosity: 1,500 cps / 25 ° C

Polyol B: A polyol obtained by reacting a glycerine initiator with 15 wt% of propylene oxide and ethylene oxide. OH.value: 34, average molecular weight: 4,950, viscosity: 750 cps / 25 ° C

Polyol C: A polyol obtained by reacting a glycerine initiator with 20 wt% of propylene oxide and ethylene oxide. OH.value: 56, molecular weight: 3,000, viscosity: 450 cps / 25 ° C

Polyol D: A polyol obtained by reacting a glycerine initiator with 15 wt% of propylene oxide and ethylene oxide. OH.value: 48, molecular weight: 3,500, viscosity: 480 cps / 25 ° C

Polyol E: A polyol obtained by reacting glycerol initiators with propylene oxide. OH.value: 56, molecular weight: 3,000, viscosity: 450 cps / 25 ° C

 IPDI prepolymer: NCO = 20%

Crosslinking agent 1: 1,4 butanediol

Crosslinker 2: ethylene glycol

Crosslinker 3: Mono Ethanol Amine

Crosslinking agent 4: diethanol amine

Catalyst 1: Dimethyl Tin

Catalyst 2: 1,8-diazabicycloalkene

Catalyst 3: Octoic acid first tin

Catalyst 4: potassium octylate

Catalyst 5: 33% Triethylene diamine and dipropylene glycol

Catalyst 6: 70% bis (dimethylaminoethyl) ether and 30% dipropylene glycol

Catalyst 7: N, N, N ', N', N-pentamethyl-diethylene triamine

Catalyst 8: dibutyl dilaurate

Defoamer 1: B 4900 (GOLDSMITH)

Foam stabilizer 2: DC 193 (AIR PRODUCTS)

Foam stabilizer 3: DC 5043 (AIR PRODUCTS)

Defoamer 4: L 580 (GE SPECIALS)

Defoamer 5: L5231 (GE SPECIALS)

Example  1-4, Comparative example  1,2

The formulation and foaming condition of the yellowing-free system is foamed under the index 100 ~ 110 condition with isophorone diisocyanate of NCO% 37.8.In the LAB stage, the RPM agitation speed is 1,500 to 2,000, low pressure foaming to control the size and uniformity of the foam cell. the plant could be obtained and desired gyunildoeul foam cell sizes over the nitrogen amount 100 ~ 500cc, foaming head discharge pressure 0.5 ~ 3kg / m ³ control, in the case of high pressure to give to give the head size adjustment. Table 1 compares the reactivity and foam molding stability according to polyol system formulation change, cell uniformity and size, moldability and UV stability according to catalyst formulation and other additive changes.

In Examples 1 to 4, the reaction rate of the foam according to the catalyst change, the evaluation of the foam formability and the degree of yellowing of the foam were compared. In Comparative Example 1, the evaluation of the SLAB system using the conventional TDI was compared. The results of the evaluation of the reactivity showed good results in Examples 1, 2, 3, and 4 using the metal-based catalyst. In Example 4, where the amount of the catalyst 2 was used, foam collapse occurred and the amount of the catalyst increased. For Example 2, there was no change in reactivity and formability with increasing catalyst.

Examples 1, 2, 3, and 4 foams showed a high internal close cell content, and Comparative Example 2, in which the amine catalyst was prescribed alone, showed no significant difference in reactivity, but the molding stability was higher than that of the metal catalyst. In particular, in the case of the amine catalyst alone, a foam shrinkage problem occurred due to the excessive close cell, and yellowing occurred faster than the metal-based catalyst. Foamed foams using the TDI of Comparative Example 1 showed stable results in reactivity and formability, but the yellowing occurred most rapidly due to the TDI having an aromatic structure.

Example  5-10, Comparative example  3

In Example 5-10, the crosslinking agent change (crosslinking agent 3 to 4), the reactivity and foam formability according to the polyol type and content change were evaluated. When changing to crosslinking agent 4, the reaction rate decreased, and when the content of crosslinking agent 4 was increased, the reactivity and the OPEN property of the foam tended to be improved, and the formulation using polyol C showed better foam shrinkage stability according to the change of prescription compared to polyol B. Comparative Example 3 is a prescription of the domestic patent 10-2004-0110697 odor and fogging problems caused by the use of a large amount of various catalysts and the problem that yellowing phenomenon occurs a little faster when using the amine catalyst and foam shrinkage even under slight changes in conditions during molding Molding widths such as collapse have been shown to affect the narrow molding stability.

Example  11-16

In Examples 11 to 16, the foam openness was evaluated by changing the foaming agent content and the ratio to improve the openness of the yellowing-free system foam. In each system formulation, openness was improved as the amount of foam stabilizer 1 was increased, and foam cell size and uniformity were improved as the amount of foam stabilizer 2 was increased, but the usage of the foam cell was increased due to the increased closeness of the foam cell. The lower the content of the agent, the higher the foam openness, but there is a problem of increasing the uniformity and cell size of the foam cell.

Example  17-19, Comparative example  4-6

In Examples 17 to 19, the reactivity and density change according to the index change for the polyol formulation with improved foam openness and the IPDI prepolymer of NCO% 20 in US Patent 5,147,897 were compared and evaluated in Comparative Examples 4, 5 and 6. Formulations made with IPDI as raw materials can form low density foams with a molding density of 32 to 40, while the prepolymer formulations have a constant overall reaction rate during foam foaming, which allows control of the molding stability of the inner foam and the uniformity and size of foam cells. On the other hand, there is a problem in the yield of foam products due to decreased reactivity and increased molding density, which makes it difficult to commercialize.

Comparative example  7

The commercialization of low-density yellowing system is currently very difficult to develop as only two companies in the world have developed and sold it. This is due to the use of aliphatic isocyanates which are stable to UV but very slow in reactivity, and are highly moldable even when the product is produced in the SLAB line, which is a continuous production line with various conditions and various catalysts and additives. This is because shaking problems occur and change of foam formability such as foam shrinkage or collapse occurs. Therefore, in order to secure the formability of the product, in addition to the use of a highly active catalyst, the use of a polyol having a high functional group and an appropriate combination of additives that can give a synergistic effect with the catalyst is required.

As a result of evaluation of heat resistance and light resistance by aging resistance evaluation of competitor's product and our developed product, in case of heat resistance, the competitor's product is a surface foam due to foam decomposition after storing foam foam of a certain size for 3 hours at 150 ℃. There was a lot of crumbs and yellowing due to heat. However, our products did not cause surface foam decomposition and heat discoloration showed less change than competitors' products. On the other hand, the foam properties tended to increase the elongation of foam at high temperature in both products, but there was no change in other properties. Evaluation of light resistance of foam measured after UV irradiation with Osram lamp 300W Also, competitor's product shows the surface surface collapse caused by decomposition of foam while competitor's product shows stable characteristics in our product. The foam was superior to the competition in aging resistance tests against heat and UV. This difference in aging resistance is considered to be stable to heat or light because our system products have lower content of low molecular weight additives added for reactivity or molding stability than competing products.

Prescription Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Comparative Example 2 Polyol A 100 100 100 100 100 Polyol B Polyol C 100 Polyol D Crosslinking agent 1 0.5 0.5 0.5 0.5 0.5 Crosslinking agent 2 Crosslinker 3 5 5 5 5 5 Crosslinker 4 Catalyst 1 0.5 2 0.5 0.5 - Catalyst 2 0.5 0.5 0.5 One - Catalyst 3 Catalyst 4 Catalyst 5 0.5 3 Catalyst 6 0.07 5 Antifoam 1 2 2 2 2 1.5 2 Defoamer 2 One One One One One Defoamer 3 ISO IPDI IPDI IPDI IPDI TDI IPDI INDEX 105 105 105 105 105 105 CT 25 25 25 22 9 29 RT 150 150 150 85 115 150 Cell size Good Good Good increase Good Good Cell uniformity Good Good Good Bad Good Good Formability Good, C Good, C Good, C collapse Good, O Good, S Yellowing One One One    2 7 4

CT: Cream Time (sec), RT: Rise Time (sec)

Formability: C (Close cell), O (Open cell) S (Shrinkage)

Yellowing: good>1>2>3>4>5>6>7> poor

Prescription Example 5 Example 6 Example 7 Example 8 Example 9 Example 10 Comparative Example 3 Polyol A 50 50 50 50 50 50 Polyol B 50 50 50 Polyol C 50 50 50 Polyol D Polyol E 100 Crosslinking agent 1 0.5 0.5 0.5 0.5 0.5 0.5 Crosslinking agent 2 Crosslinker 3 Crosslinker 4 5 6 7 5 6 7 One Catalyst 1 0.5 0.5 0.5 0.5 0.5 0.5 Catalyst 2 0.5 0.5 0.5 0.5 0.5 0.5 0.5 Catalyst 3 0.5 Catalyst 4 1.5 Catalyst 5 Catalyst 6 0.2 Catalyst 7 Catalyst 8 1.0 Antifoam 1 2 2 2 2 2 2 2 Defoamer 2 One One One One One One One Defoamer 3 Defoamer 4 1.5 ISO IPDI IPDI IPDI IPDI IPDI IPDI IPDI INDEX 105 105 105 105 105 105 105 CT 34 29 24 30 27 24 17 RT 183 167 154 175 163 152 88 Cell size Good Good Good Good Good Good Good Cell uniformity Good Good Good Good Good Good Good Formability Good, C Good, C Good, C Good, C Good, C Good, C Good, C OPEN surname comparison 7 6 5 4 3 One 2

1) CT: Cream Time (sec), RT: Rise Time (sec),

Formability: C (Close cell), O (Open cell), S (Shrinkage)

2) Foam OPEN Comparison: Foam OPEN 1>2>3>4>5>6> 7 Close Cell

Prescription Example 11 Example 12 Example 13 Example 14 Example 15 Example 16 Polyol A 50 50 50 50 50 50 Polyol B Polyol C 50 50 50 50 50 50 Polyol D Crosslinking agent 1 0.5 0.5 0.5 0.5 0.5 0.5 Crosslinking agent 2 Crosslinker 3 Crosslinker 4 7 7 7 7 7 7 Catalyst 1 0.5 0.5 0.5 0.5 0.5 0.5 Catalyst 2 0.5 0.5 0.5 0.5 0.5 0.5 Catalyst 3 Catalyst 4 Catalyst 5 Catalyst 6 Antifoam 1 2 2 One One 0.5 0.5 Defoamer 2 One 2 2 0.5 0.5 Defoamer 3 ISO IPDI IPDI IPDI IPDI IPDI IPDI INDEX 105 105 105 105 105 105 CT 24 24 24 24 24 24 RT 152 152 152 152 152 152 Cell size Good Good Good Good Good increase Cell uniformity Good Good Good Good Good decrease Formability Good, C Good, C Good, C Good, C Good, O Good, O OPEN surname comparison 5 6 7 4 3 2

1) CT: Cream Time (sec), RT: Rise Time (sec),

Formability: C (Close cell), O (Open cell), S (Shrinkage)

2) Foam OPEN Comparison: Foam OPEN 1> 2> 3> 4> 5> 6> 7 Close Cell

Prescription Example 17 Example 18 Example 19 Comparative Example 4 Comparative Example 5 Comparative Example 6 Comparative Example 7 Polyol A 50 50 50 50 50 50 Polyol B Polyol C 50 50 50 50 50 50 Polyol D Competitors 100 Crosslinking agent 1 0.5 0.5 0.5 0.5 0.5 0.5 Crosslinking agent 2 Crosslinker 3 1.5 Crosslinker 4 7 7 7 7 7 7 Catalyst 1 0.5 0.5 0.5 0.5 0.5 0.5 Catalyst 2 0.5 0.5 0.5 0.5 0.5 0.5 Organotin 0.3 Metal salt 1.0 Antifoam 1 0.5 0.5 0.5 0.5 0.5 0.5 Defoamer 2 0.5 0.5 0.5 0.5 0.5 0.5 Defoamer 5 1.0 Water 3 3 3 3 3 3 4 CFC-11 4 ISO 1 IPDI IPDI IPDI IPDI ISO 2 Prepoly Prepoly Prepoly INDEX 95 100 105 95 100 105 105 W / R 100/49 100/52 100/55 100/88 100/93 100/98 CT 23 24 25 61 65 67 RT 148 152 156 350 362 380 FRD 41 39 37 85 82 79 Heat resistance Good Good Good Good Good Good Surface defect Light resistance Good Good Good Good Good Good Surface defect

1) CT: Cream Time (sec), RT: Rise Time (sec)

2) Heat resistance evaluation: Foam discoloration after physical agitation for 3 hours at 150 ℃, property evaluation

3) Light resistance evaluation: Osram lamp 300W, 6 days evaluation

4) Refer to patent data for competitor system conditions of comparative example

Test Items Test result Example 18 Example 18 (Heat Resistance) Example 18 (light resistance) Competitor Form Competitor Foam (Heat Resistance) Competitor Foam (Light Resistance) density ㎏ / ㎥ 33 34 34 34 34 34 Hardness (25% compression) ㎏ / 314㎠ 10.88 8.02 Hardness (65% compression) ㎏ / 314㎠ 31.68.5 24.65 Tear strength Kg / cm 0.65 0.58 0.59 0.64 0.35 0.25 The tensile strength ㎏ / ㎠ 1.20 1.31 1.21 1.27 0.7 0.55 Elongation % 147 188 124 149 85 50 Resilience % 47 47 47 45 45 45

* Competitor Form: INOAC Import Form Assessment

Although the above embodiments are described in detail with respect to the invention, it is described for the purpose of illustrating the invention and should not be understood in any case for the purpose of limiting the invention.

Claims (3)

A polyether polyol, crosslinking agent, foam stabilizer, and diazabicycloalkene having an OH functional group of 3 to 8 and a weight average molecular weight of 3,000 to 9,000, wherein the alkene is undecine, desine, or nonene, and a catalyst system consisting of a dimethyl tin catalyst A yellowing foam production method, characterized in that the resin premix comprising a mixed foam with isophorone diisocyanate. The method of claim 1, wherein the polyether polyol functional group is 4 to 6, characterized in that the yellowing foam production method. 3. The method of claim 1 or 2, wherein the polyether polyol is prepared using sorbitol.