KR101121744B1 - A non-yellowish polyurethane foam with an excellent elastic and elongation properties and and a manufacturing method thereof - Google Patents

Abstract

The present invention relates to a yellowing-free urethane foam and a method for producing the same, and more particularly, to a high elasticity, high elongation-free yellowing urethane foam for a slab and a manufacturing method thereof.

The yellowing-free urethane foam according to the present invention is a polyether polyol having an OH functional group of 3-5 and a molecular weight of 3,000 to 9,000, and a polycaprolactone ester polyol having a molecular weight of 500 to 5,000, a crosslinking agent and a foam stabilizer. By mixing and foaming a resin premix including diaza bicycloalkene and an organometallic catalyst with an aliphatic or alicyclic diisocyanate, it is possible to prevent the collapse of the foam in the slab manufacturing process produced in a continuous production method, Using the catalyst of the has the effect of suppressing the yellowing phenomenon caused by the excessive use of the catalyst.

Description

Non-yellowing urethane foam with excellent elongation and elastic properties and its manufacturing method {A NON-YELLOWISH POLYURETHANE FOAM WITH AN EXCELLENT ELASTIC AND ELONGATION PROPERTIES AND AND A MANUFACTURING METHOD THEREOF}

The present invention relates to a yellowing-free urethane foam and a manufacturing method thereof, and more particularly, to a high elasticity, high elongation-free yellowing urethane foam for slabs 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 foaming agent in prepolymers based on aliphatic isocyanates (Hexamethylene diisocyanate) and PEG (Polyethylene glycol). It is an excellent formulation with a higher molding density than foams that are commercially available, due to the low NCO% of the prepolymer making 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 low density yellowing system with a density of 29 to 31 Kg / m ³ was described. Recently, the development of a yellowing-free foam is required to develop a product having high physical properties such as high elasticity and high elongation compared to the existing product to expand the use in addition to the bra pad. High-elastic, yellowing-free systems can be used in high molecular weight polyol formulations with molecular weights of 5,000 or more as foam products with elasticity of 50 or more. In addition, foam development of more than 200% of elongation is limited to existing polyether-based polyols, so it is required to introduce polyester-based polyols and to select polyester-based polyols that are stable to hydrolysis.

In order to solve this problem, Korean Patent Application No. 10-2007-120236 discloses a polyether polyol used while reacting an aliphatic polyether and an aliphatic or cycloaliphatic isocyanate, and using a catalyst system made of diazabicyclocycloene and an organic metal catalyst. OH functional group 3-8, molecular weight of 3,000-9,000, using a resin premix for the production of non-yellowing foam that can maintain the reaction rate without providing an excess of catalyst, and can provide the molding stability of the foam Provided.

However, there is a continuing need for resin premixes with higher molding stability and physical properties.

An object of the present invention is to provide a foam manufacturing method for expanding the use of the non-yellowing foam by improving the high elastic, high elongation mechanical properties.

Another object of the present invention is to provide a method for producing a yellowing-free foam which can provide the molding stability of the foam, in addition to expanding the use of the high-elasticity, high elongation of mechanical properties of the yellowing-free foam.

Another object of the present invention is to increase the use of high-elasticity, high elongation of mechanical properties of the yellowing-free foam, and to maintain the reaction rate without using an excess catalyst, yellowing that can provide the molding stability of the foam It is to provide a foam manufacturing method.

It is another object of the present invention to provide a low density yellowing foam manufacturing method which can maintain the reaction rate without using an excess of 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 having an OH functional group of 3-5 and a molecular weight of 3,000 to 9,000, an ester polyol that is stable to hydrolysis, a crosslinking agent, a foam stabilizer, and a dia. It is characterized in that the resin premix including the bicycloalkene and the organic tin catalyst is mixed and foamed with an aliphatic or alicyclic isocyanate.

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 reaction rate with aliphatic isocyanate, and collapse during foam formation. It is recommended to use a high molecular weight polyol to prevent it. When the OH group of the polyether polyol is less than or equal to 3, problems of collapse during foam molding, a decrease in permanent compressive strain, and a decrease in hardness may occur. In the case of 5 or more, there are problems such as foam shrinkage and hardness increase. Also preferred is a molecular weight ranging from 3,000 to 9,000, more preferably 4,000 to 8,000. If the molecular weight is less than the above range, there is a problem that the foam hardness and the molding width of the foam is narrowed, and if the molecular weight is more than 9,000, problems may occur in processability such as flowability and formability due to the decrease in hardness and viscosity increase during urethane reaction. have.

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 practice of the present invention, the polyester polyol is added to improve the elongation of the yellowing-free foam, and is stable in hydrolysis and has a characteristic of greatly increasing mechanical properties such as elongation and tensile and tear. The functional group is preferably a 2-3-valent product, the molecular weight is 500-5,000, preferably 1,000-2,000, and the addition ratio with the polyether polyol is 10-50% by weight of the total polyol, preferably the polyester polyol. It is possible to develop high elongation products in the range that the use does not affect other physical properties up to about 10-40% by weight, more preferably about 20-30% by weight.

The yellowing foam according to the present invention is stable to increase the elasticity, increase the yellowing stability and foam decomposition during ultraviolet irradiation when the molecular weight of the polyether polyol is increased, increase the elongation when increasing the molecular weight of the ester polyol, increase the yellowing stability and foam decomposition during ultraviolet irradiation Yellow-free foams that are stable to can be prepared.

In the present invention, when the functional group of the polyester polyol is low, there is a problem in molding stability of shrinkage during foam molding, and when the functional group of the polyester polyol is high, there is a problem with flow and miscibility with other raw materials due to the viscosity increase. There may be problems with sex. In addition, when the molecular weight of the polyester polyol is low, there is a problem of foam hardness due to the increase in elasticity and hardness, and when the molecular weight of the polyester polyol is high, the processing according to the recovery of the bra foam during foam bra processing due to the increase in elasticity There may be a problem with stability.

In the practice of the present invention, the polyester polyol is more preferably used polycaprolactone polyester polyol for high elongation foam development.

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 glycol, glycerin, diethylene glycol, triethylene glycol, triethanol amine, diethanol amine, and monoethanol amine may be used and mixed, preferably ethylene glycol, 1,4 butanediol, diethanol It is preferable to use amine, monoethanol amine, etc. individually or in mixture. 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 total 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 0.1-10 parts by weight, preferably 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 Degussa or DABCO DC 193, DC 5043, DC 5388, DC 5169 from Air Products. Or L580, L5740M, L6900, L2100, L3002, and the like, may be used.

In the case of using the mixed polyol according to the present invention, it is preferable to use an active foam stabilizer and a weak foam stabilizer to form an open cell so as to increase the openness of the cell and prevent shrinkage of the slab foam. A mixture of B4900 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 isocyanates 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 (DBU). Preferred is 1,5-diazabicyclo (5,4,0) -undecine-7.

In a preferred embodiment of the invention, the mixed catalyst is a single mixed catalyst consisting 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. If the amount of the catalyst is excessive, there may be a problem such as difference in cell size and increase of close cell content according to the area of the foam (top, middle, bottom) due to the promotion of reactivity. Increasing cell size due to the problem and in severe cases may cause problems in formability, such as foam collapse.

In a preferred embodiment of the present invention, the method for producing a yellowed foam of the present invention is 70-80% by weight of a polyether polyol having an OH functional group of 3-5 and a molecular weight of 3,000-9,000 and OH functional group of 2-3, the weight average molecular weight 100 parts by weight of a mixed polyol consisting of 20-30% by weight of a 500-5,000 polyester polyol; 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 the aliphatic isocyanate and foamed.

In the present invention, the aliphatic or alicyclic isocyanate 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, most preferably 105.

In the present invention, foaming agents used in the production 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 other blowing agents are used in an amount of about 1-20 parts by weight.

In the present invention, polyurethane foams using aliphatic or cycloaliphatic isocyanates 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 other additives. It is preferable to add.

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.

The present invention provides a polyether polyol having a OH functional group of 3-5 and a molecular weight of 3,000-9,000, and a polyester polyol having a OH functional of 2-3 and a molecular weight of 500-5,000 in a non-yellowing foam mixed polyol; A crosslinking agent; Foam stabilizers; And a resin premix including the catalyst system is mixed and foamed with aliphatic or alicyclic isocyanates.

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 isocyanate isophorone diisocyanate. It is good to use.

In the present invention, a polyol polyol having a resin premix for preparing a yellowed foam having an OH functional group of 3-5, a molecular weight of 3,000-9,000, and a OH functional group of 2-3, and a polyester polyol having a molecular weight of 500-5,000 is mixed with 100 weight of polyol Part, 0.1-10 parts by weight of crosslinking agent, 0.1-10 parts by weight of foam stabilizer, and 0.01-5.0 parts by weight of 1,8-diaza bicycloalkene and organic tin catalyst, respectively.
In the present invention, the non-yellowing foam is characterized in that the low density foam for slabs having a molding density of 28-35 Kg / m ³ , more preferably 33-35 Kg / m ³ .

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

The non-yellowing polyurethane product produced by the present invention is a high molecular weight ether polyol for the development of high elastic foam, polycaprolactone ester polyol for the development of high elongation foam, foamed by using a small amount of excellent catalyst and foaming agent with excellent activity It was provided as a product with excellent molding stability and foam openability. In addition, yellowing does not occur even when exposed to light for a long time, and the foam decomposition rate stability by ultraviolet rays has superior characteristics compared to competitors' products.

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 a glycerine initiator with 15 wt% of propylene oxide and ethylene oxide. OH.value: 34, average molecular weight: 4,800, viscosity: 850 cps / 25 ° C

Polyol B: A polyol obtained by reacting a glycerine initiator with 15 wt% of propylene oxide and ethylene oxide. OH.value: 28, average molecular weight: 6,000, viscosity: 1,100 cps / 25 ° C

Polyol C: A polyol obtained by reacting a glycerine initiator with 15 wt% of propylene oxide and ethylene oxide. OH.value: 26, average molecular weight: 6,500, viscosity: 1,200 cps / 25 ° C

Polyol D: Polycaprolacton ester polyol, OH. Value: 112, molecular weight: 1,000, viscosity: 150 mPa.s / 60 ° C

Polyol E: Polycaprolacton ester polyol, OH. Value: 56, Molecular weight: 2,000, Viscosity: 400 mPa.s / 60 ° C

Polyol F: Polycaprolacton ester polyol, OH. Value: 84, Molecular weight: 2,000, Viscosity: 355 mPa.s / 60 ° C

Polyol G: 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

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)

(Examples 1 to 3, Comparative Examples 1 and 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 elastic and other physical properties, reactivity, foam molding stability, cell uniformity, size, and yellowing stability.

In Examples 1 to 3, foam reactivity, foam elasticity and physical property evaluation according to polyol type change were compared, and cell stability of foam was compared. In Comparative Example 1, physical property and formability evaluation of a conventional SLAB system using low molecular weight were compared and compared. 2 compares the physical properties and formability of the competitor I company product. The results of the evaluation of the reactivity of the examples 1, 2, 3 using a metal-based catalyst showed a good reactivity, the double molecular weight of Example 3 High elasticity results were obtained. In addition, as a result of evaluation of stability against yellowing, polyol formulation with high molecular weight showed better stability against discoloration and improved softness of foam, thereby showing high quality foam characteristics. In addition, when the yellowing evaluation using the UV A, B tester (temperature condition 63 degrees, 1.2W / m ² / nm), the brittle phenomenon due to the decomposition of the foam surface by ultraviolet light was obtained as the molecular weight increases. In Comparative Examples 1 and 2, there was no significant difference in reactivity, but the elasticity and mechanical properties were low, and the yellowing speed of the foam was faster than that of the high molecular weight polyol. The decomposition phenomenon by the rapid progress was shown.

(Examples 4 to 6, Comparative Examples 1 and 2)

In Examples 4 to 6, changes in mechanical properties such as reactivity and elongation according to the type and content of polycaprolactone ester polyols which are stable to hydrolysis were evaluated. When the polycaprolactone ester polyol was applied, the moldability of the foam tended to be more severe than that of the conventional formulation, and molding stability could be secured by changing the silicon content and adding other foam stabilizers. The physical properties such as elongation of the foam were able to obtain an elongation at least 200% when the polycaprolactone polyol 20-40 wt% was added to the high molecular weight polyol 60-80 wt% of 5000 or more.

(Comparative Example 2)

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 a change in 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 to improve the physical properties it is required to use a high molecular weight polyol and ester-based polyol stable to hydrolysis.

The evaluation of mechanical properties of the competitors' products and the products developed by our company resulted in an increase in the elasticity when the molecular weight was increased. The elongation was changed by the ester-based polyol molecular weight and the number of functional groups. In addition, as a result of evaluating the durability of the foam using the UV light facilitation tester, competitors' products showed decomposition of the surface of the foam after about 2 days, whereas our products showed very stable foam decomposition under UV irradiation conditions. This difference in aging resistance is stable to light due to the low content of low molecular weight additives added for reactivity or molding stability compared to competitors' products, and showed better stability to foam decomposition than high molecular weight polyols. In addition, the discoloration stability against UV light showed more stable characteristics as the molecular weight was higher, and the most yellowing-free foam product of Example 3, which is a high molecular weight polyol formulation, showed the most stable result in UV light.

[Table 1]

Prescription Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Polyol A 100 Polyol B 100 Polyol C 100 Polyol G 100 Competitors 100 Crosslinking agent 1 1.5 2.5 2.5 5 Crosslinking agent 2 2.5 3.5 3.5 Crosslinker 3 5 1.5 Crosslinker 4 One One One Catalyst 1 0.5 0.5 0.5 0.5 Catalyst 2 0.5 0.5 0.5 0.5 Catalyst 3 Organotin 0.3 Metal salt 1.0 Antifoam 1 2 2 2 2 Defoamer 2 0.5 0.5 0.5 Defoamer 3 One 1.0 ISO IPDI IPDI IPDI IPDI IPDI INDEX 105 105 105 105 CT 34 37 37 30 RT 195 200 204 180 Cell size Good Good Good Good Good Cell uniformity Good Good Good Good Formability Good, C Good, C Good, C Good, O Yellowing One One One 2 One

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

◈ Formation: C (Close cell), O (Open cell), S (Shrinkage)

◈ Yellowing: Good 1> 2> 3> 4> 5> 6> 7 Poor

TABLE 2

Prescription Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Molding density 33 34 34 32 33 Properties Shout(%) 46 54 58 35 43 The tensile strength
(Kg / cm2) 1.23 1.34 1.41 0.84 0.92 Tear strength
(Kg / cm) 0.85 0.97 1.08 0.65 0.72 % Elongation 160 166 168 150 150 UV rating
(QUV-B) 2 days Good Good Good Good Foam decomposition starts 4 days Good Good Good Good 6 days Good Good Good Good 8 days Good Good Good Start decomposition 10 days Good Good Good 12 days Good Good Good 14 days Good Good Good

◈ UV evaluation condition (form decomposition evaluation)

◈ UV-B

◈ Temperature: 63 degrees

◈ Actual irradiance: 1.2 w / m2 / nm

[Table 3]

Prescription Example 4 Example 5 Example 6 Comparative Example 1 Comparative Example 2 Polyol A / D 80/20 Polyol A / E 80/20 Polyol A / F 80/20 Polyol G 100 Competitors 100 Crosslinking agent 1 1.5 1.5 1.5 5 Crosslinking agent 2 2.5 2.5 2.5 Crosslinker 3 5 1.5 Crosslinker 4 One One One Catalyst 1 0.5 0.5 0.5 0.5 Catalyst 2 0.5 0.5 0.5 0.5 Catalyst 3 Organotin 0.3 Metal salt 1.0 Antifoam 1 2 2 2 2 Defoamer 2 0.5 0.5 0.5 Foam stabilizer One 1.0 ISO IPDI IPDI IPDI IPDI IPDI INDEX 105 105 105 105 CT 25 25 25 30 RT 150 150 150 180 Cell size Good Good Good Good Cell uniformity Good Good Good Good Formability Good, C Good, C Good, C Good, O Yellowing 2 One One 2 One

Prescription Example 4 Example 5 Example 6 Comparative Example 1 Comparative Example 2 Molding density 35 34 34 32 33 Properties Shout(%) 45 46 48 35 43 The tensile strength
(Kg / cm2) 1.79 1.88 1.76 0.84 0.92 Tear strength
(Kg / cm) 1.35 1.78 1.51 0.65 0.72 % Elongation 241 259 243 150 150 UV rating
(QUV-B) 2 days Good Good Good Good Foam decomposition starts 4 days Good Good Good Good 6 days Good Good Good Good 8 days Good Good Good Start decomposition 10 days Good Good Good 12 days Start disassembly Good Good 14 days - Good Good

◈ UV evaluation condition

◈UV-B

◈ Temperature: 63 degrees

Actual irradiance: 1.2 w / m ² / nm

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

Claims (10)

An aliphatic or cycloaliphatic resin containing a polyol, a crosslinking agent, a foam stabilizer, and a diaza bicycloalkene and an organic metal catalyst, in which a polyether polyol having a OH functional group of 3-5 and a weight average molecular weight of 3,000-9,000 is mixed with a polyester polyol Process for producing a yellowing foam, characterized in that the foam is mixed with isocyanate. The method of claim 1, wherein the functional group of the polyester polyol is 2-3. The process of claim 1 or 2, wherein the weight average molecular weight of the polyester polyol is 500-5,000. The method of claim 1 or 2, wherein the polyester polyol is a polycaprolactone ester polyol, and the polyether polyol is a method for producing a yellowed foam, wherein glycerol is used as a starting material. The method of claim 1 or 2, wherein the organic metal catalyst is dimethyl tin. The method of claim 1 or 2, wherein the polyol comprises 50-90% by weight of polyether polyol and 10-50% by weight of polyester polyol. 100 parts by weight of a polyol consisting of 50-90% by weight of a polyether polyol having a OH functional group of 3 to 5 and a weight average molecular weight of 3,000 to 9,000 and 10-50% by weight of a polyester polyol, 0.1-10 part by weight of a crosslinking agent, 0.1-bubble agent 10 parts by weight, and a resin premix containing 1,8- diaza bicycloalkene and 0.01 to 5.0 parts by weight of each organic tin catalyst is reacted with isophorone diisocyanate and foamed. 8. The method of claim 7, wherein the polyester polyol is a polyester polyol having an OH functional group of 2-3 and a weight average molecular weight of 1,000 to 2,000. 8. The method of claim 7, wherein the polyester polyol is a polycaprolactone polyester polyol. The method of claim 7, wherein the yellowing-free foam is a low-density foam for slabs having a molding density of 28-35 Kg / m ³ .