Eco-friendly polyurethane foam-forming composition having improved thermal insulation properties and method for preparing polyurethane foam

Abstract

The present invention relates to a composition for forming an eco-friendly polyurethane foam having improved heat insulation properties, a method for preparing a polyurethane foam, and the like, and more particularly, to a two-part composition for forming a polyurethane foam, which comprises a composition containing a natural product-derived anhydrosugar alcohol in a specific content range, and a composition for forming a polyurethane foam, and a method for preparing a polyurethane foam, and the like, and more particularly, to a two-part composition for forming a polyurethane foam, which contains a natural product-derived anhydrosugar alcohol in a specific content range. Especially, the polyol premixed composition of isosorbide can be used for preparing the environment-friendly polyurethane foam capable of improving all physical properties including the foaming state of the foam and the heat insulation property at the same time; a method for preparing a polyurethane foam using the two-part type composition for polyurethane foam formation; the invention also relates to the environment-friendly polyurethane foam prepared by the method.

Description

Technical Field

[0001] The present invention relates to a composition for forming an environmentally friendly polyurethane foam having improved heat insulation and a method for preparing a polyurethane foam, and more particularly to a two-component composition for forming a polyurethane foam, wherein the composition comprises a polyol premix composition containing a natural dehydrated sugar alcohol, particularly isosorbide, within a specific content range, and can prepare an environmentally friendly polyurethane foam having improved all physical properties including the foaming state of the foam and heat insulation; a method for preparing a polyurethane foam using the two-component composition for forming a polyurethane foam; and the environmentally friendly polyurethane foam prepared thereby. Background Art

[0002] Generally, rigid polyurethane foam is lightweight, has excellent heat insulation, sound insulation and molding processability, and is therefore widely used as insulation materials for refrigerators, refrigerated containers, LNG ships, building insulation, insulation materials, decorative materials, etc. Rigid polyurethane foam is mainly used for insulation materials, and when used as interior materials for buildings, high flame retardancy is required.

[0003] In order to improve the flame retardancy of rigid polyurethane foam, it is most important to use polymeric MDI as the isocyanate raw material and aromatic ester polyol composition solution as the polyol raw material. This is because when polymeric MDI reacts with aromatic ester polyol to generate a polyurethane product, rigid polyurethane foam with excellent flame retardancy can be prepared. From this point of view, manufacturers of home appliances, ships, and building / construction materials recognize that the use of environmentally friendly materials in product production is one of the keys to product performance. In addition, in order to reduce carbon dioxide, prevent global warming, and prepare for the depletion of fossil fuels, attention to biomaterials that can reduce carbon dioxide and harmful gases is increasing, and research is being actively carried out. Biomaterials are known to reduce the generation of carbon dioxide and volatile organic compounds, have excellent biodegradability, and reduce the use of fossil fuels.

[0004] Polyurethane is prepared by polymerization reaction with isocyanate and polyol as main components, wherein the isocyanate group of the isocyanate compound reacts with the hydroxyl group of the polyol. Polyurethane foam is also prepared by a method of simultaneously mixing isocyanate, polyol, water, additives, etc. and foaming, or polyurethane foam can be prepared by a prepolymer method in which a polyol and a diisocyanate are reacted to form a prepolymer, and then a catalyst, a blowing agent and an additive are mixed therein and foamed.

[0005] Representative isocyanate compounds for preparing polyurethane foams can be listed as toluene diisocyanate (TDI) compounds and methylene diphenyl diisocyanate (MDI) compounds. TDI is a mixture of 2,4-TDI and 2,6-TDI isomers in a ratio of 80:20 weight %, respectively. TDI and MDI have partially similar properties and have unique physical and chemical properties, respectively. Therefore, according to the use of polyurethane foams, TDI or MDI is selectively used, mixed or mixed with their derivatives. In addition, due to various reasons, such as the accelerated depletion of petroleum resources, the demand for greenhouse gas reduction caused by climate change, the rise in raw material prices, the increase in demand for renewable raw materials, etc., in the field of carbamates, it is necessary to partially or completely replace the existing petroleum raw materials with environmentally friendly components in the field of polyols such as polyether polyols and polyester polyols prepared from petroleum raw materials and the field of isocyanates.

[0006] Korean Patent No. 10-2199919 discloses a technology in which the air permeability and antioxidant properties of polyurethane foam are improved by including a small amount (1 to 5 parts by weight) of anhydrosugar alcohol per 100 parts by weight of the polyol component in a two-component type composition for forming polyurethane foam comprising a polyol component and a polyisocyanate component. However, polyurethane foam formed from such a composition needs to be further improved in various desired physical properties, particularly in terms of thermal insulation. Summary of the invention

[0007] Technical issues to be solved

[0008] The present invention is proposed to solve the above-mentioned problems in the prior art, and its purpose is to provide a polyurethane foam-forming composition and a method for preparing polyurethane foam using the polyurethane foam-forming composition, etc. The polyurethane foam-forming composition can be used to prepare an environmentally friendly polyurethane foam that is excellent in all physical properties including the foaming state of the foam and has improved thermal insulation.

[0009] Technical Solution

[0010] In order to achieve the above object, the present invention provides a two-component composition for forming polyurethane foam, the two-component composition for forming polyurethane foam comprising: a polyol premix composition as a first component; and a polyisocyanate as a second component, wherein the polyol premix composition comprises: a polyol mixture consisting of anhydrosugar alcohol and a polyol other than the anhydrosugar alcohol; an amine catalyst; a foaming surfactant; and a blowing agent, wherein the polyol mixture comprises the anhydrosugar alcohol in an amount of more than 5 parts by weight to less than 35 parts by weight based on 100 parts by weight of the polyol mixture.

[0011] In a specific embodiment, the polyol premix composition may further include a flame retardant.

[0012] According to another aspect of the present invention, there is provided a method for preparing polyurethane foam, the method comprising the steps of mixing and reacting a polyol premix composition and a polyisocyanate, the polyol premix composition comprising: a polyol mixture consisting of anhydrosugar alcohols and polyols other than the anhydrosugar alcohols; an amine catalyst; a foaming surfactant; and a blowing agent, wherein the polyol mixture comprises the anhydrosugar alcohol in an amount of more than 5 parts by weight to less than 35 parts by weight based on 100 parts by weight of the polyol mixture.

[0013] In a specific embodiment, the polyol premix composition may further include a flame retardant.

[0014] According to another aspect of the present invention, there is provided a polyurethane foam, which is prepared by reacting a polyol premix composition and a polyisocyanate, wherein the polyol premix composition comprises: a polyol mixture consisting of anhydrosugar alcohol and a polyol other than the anhydrosugar alcohol; an amine catalyst; a foaming surfactant; and a blowing agent, wherein the polyol mixture comprises the anhydrosugar alcohol in an amount of more than 5 parts by weight to less than 35 parts by weight based on 100 parts by weight of the polyol mixture.

[0015] In a specific embodiment, the polyol premix composition may further include a flame retardant.

[0016] Beneficial Effects

[0017] When the polyurethane foam-forming composition of the present invention is used, it is possible to prepare an environmentally friendly polyurethane foam which is excellent in all physical properties including the foamed state of the foam and which also has improved heat insulation properties. DETAILED DESCRIPTION

[0018] Hereinafter, the present invention will be described in more detail.

[0019] The polyurethane foam-forming two-component type composition of the present invention comprises a polyol premix composition as a first component and a polyisocyanate as a second component.

[0020] The polyol premix composition comprises: a polyol mixture consisting of anhydrosugar alcohol and a polyol other than anhydrosugar alcohol, an amine catalyst, a foaming surfactant and a foaming agent.

[0021] The anhydrosugar alcohol used in the present invention is prepared by hydrogenating sugars derived from natural substances.

[0022] Hydrogenated sugars (also called "sugar alcohols") are compounds obtained by adding hydrogen to the reducing end groups of sugars, usually with HOCH2(CHOH) n The chemical formula of CH2OH (wherein n is an integer of 2 to 5) is classified into tetritol, pentitol, hexitol, and heptitol (with 4, 5, 6, and 7 carbon atoms, respectively) according to the number of carbon atoms.

[0023] Among them, hexitols having 6 carbon atoms include sorbitol, mannitol, iditol, galactitol, etc., and sorbitol and mannitol are substances with particularly high utility.

[0024] Anhydrosugar alcohols are substances formed by removing one or more water molecules from the inside of hydrogenated sugars. When one water molecule is removed, it has a tetraol form having four hydroxyl groups in the molecule, and when two water molecules are removed, it has a diol form having two hydroxyl groups in the molecule. It can be prepared using hexitol derived from starch.

[0025] Anhydrosugar alcohols are environmentally friendly substances derived from renewable natural resources, and therefore have long attracted attention, and methods for producing anhydrosugar alcohols have been studied. Among such anhydrosugar alcohols, isosorbide produced from sorbitol currently has the widest range of industrial applications.

[0026] Dehydrated sugar alcohol can be used in various fields, including the solvent of the composition in the medicaments such as the adhesive for treating heart and vascular diseases, patch, oral cleaner, the emulsifier in the food industry, etc. In addition, dehydrated sugar alcohol can improve the glass transition temperature of the macromolecular substances such as polyester, PET, polycarbonate, polyurethane, epoxy resin, and has the effect of improving the intensity of these materials, because dehydrated sugar alcohol is the environmentally friendly material derived from natural substances, therefore also very useful in the plastics industry such as bioplastics. In addition, known dehydrated sugar alcohol can also be used as the environmentally friendly solvent of adhesive, environmentally friendly plasticizer, biodegradable polymer, water-soluble paint. Just because of this, dehydrated sugar alcohol is widely concerned due to having various availability, and the utilization rate in actual industry is also gradually increasing.

[0027] In the present invention, the anhydrosugar alcohol may be dianhydrohexitol which is a dehydration product of hexitol, more preferably an anhydrosugar alcohol selected from isosorbide (1,4:3,6-dianhydrosorbitol), isomannide (1,4:3,6-dianhydromannitol), isoidide (1,4:3,6-dianhydroiditol) and a mixture thereof, and most preferably isosorbide.

[0028] The polyol other than the anhydrosugar alcohol used in the present invention may be a polyol generally used for preparing polyurethane foams and having an average active hydrogen number of 3 or more (preferably 2 to 6) and an active hydrogen equivalent of 100 to 2,000.

[0029] More specifically, a polyol selected from polyether polyols, polyester polyols, polymer polyols obtained by polymerizing the polyols and vinyl compounds, recycled polyols, and combinations thereof can be used. According to a specific embodiment, recycled polyols, polyether polyols, or polyether polymer polyols obtained by polymerizing polyether polyols and vinyl compounds can be preferably used.

[0030] Polyols other than dehydrated sugar alcohols can be used alone or in combination, preferably polymer polyols can be used to adjust the physical properties of rigid polyurethane foam. For example, by grafting polyester polyol or polyethylene filler (Polyvinyl filler) to polyether polyol, polymer polyols can be obtained in a stable suspension form. The vinyl compounds that can be used in the preparation of polymer polyols can list acrylonitrile (acrylonitrile), styrene monomer (styrene monomer), methyl methacrylonitrile (methylmethacrylonitrile) etc. Preferably, acrylonitrile can be used alone, or it can be mixed with styrene monomer. The content of the vinyl compounds in the polymer polyol can be 20-50 weight %.

[0031] In the present invention, the polyol mixture may contain the dehydrosugar alcohol in an amount of more than 5 parts by weight to less than 35 parts by weight based on 100 parts by weight of the polyol mixture. When the content of the dehydrosugar alcohol in 100 parts by weight of the polyol mixture is less than 5 parts by weight, the foaming properties of the polyurethane foam are relatively reduced and the heat insulation property is deteriorated. On the other hand, when the content of the dehydrosugar alcohol is more than 35 parts by weight, the foam collapses during the foaming process and cannot form a normal foam shape.

[0032] In a specific embodiment, the content of anhydrosugar alcohol contained in 100 parts by weight of the polyol mixture can be more than 5 parts by weight, 5.1 parts by weight or more, 5.5 parts by weight or more, 6 parts by weight or more, 6.5 parts by weight or more, 7 parts by weight or more, 7.5 parts by weight or more, 8 parts by weight or more, 8.5 parts by weight or more, 9 parts by weight or more, 9.5 parts by weight or more, or 10 parts by weight or more, and can be less than 35 parts by weight, less than 34.9 parts by weight, less than 34.5 parts by weight, less than 34 parts by weight, less than 33.5 parts by weight, less than 33 parts by weight, less than 32.5 parts by weight, less than 32 parts by weight, less than 31.5 parts by weight, less than 31 parts by weight, less than 30.5 parts by weight, or less than 30 parts by weight, but is not limited thereto.

[0033] The amine catalyst used in the present invention plays a role in promoting the reaction between the polyol and the isocyanate compound. In the present invention, the type of the amine catalyst is not particularly limited, and preferably one or a mixture of two or more of the tertiary amine catalysts can be used, and more specifically, an amine catalyst selected from triethylene diamine, triethylamine, N-methylmorpholine, N-ethylmorpholine and a combination thereof can be used.

[0034] In a specific embodiment, the content of the amine catalyst in the polyol premix composition can be 0.01-5 parts by weight, more preferably 0.1-3 parts by weight, based on 100 parts by weight of the polyol mixture. When the amount of the amine catalyst used is too small, the reaction is delayed, resulting in poor curing or foam collapse during the foam formation process. On the other hand, when the amount of the amine catalyst used is too large, the reaction may be too fast or shrinkage may occur.

[0035] In one embodiment, the polyol premix composition may further include an organometallic catalyst.

[0036] When an organic metal catalyst is used in the present invention, it plays a role in promoting the reaction between the polyol and the isocyanate compound.

[0037] The organic metal catalyst that can be used in the present invention may be an organic metal catalyst commonly used in preparing polyurethane foam, for example, an organic tin catalyst (more specifically, dibutyltin dilaurate (DBTDL) or bis[2-ethylhexanoate]tin) may be used, but is not limited thereto.

[0038] In a specific embodiment, when the polyol premix composition further comprises an organometallic catalyst, the content thereof may be 0.01-5 parts by weight, more specifically 0.1-3 parts by weight, based on 100 parts by weight of the polyol mixture, but is not limited thereto. When the amount of the organometallic catalyst used is too small compared to the above level, the effect of its use may be insufficient, and on the other hand, when the amount of the organometallic catalyst used is too large compared to the above level, the reaction may become too fast or may shrink.

[0039] When forming cells inside the polyurethane foam, the foaming surfactant used in the present invention prevents the generated cells from merging or breaking, and adjusts to form cells with uniform shape and size. In the present invention, as long as the foaming surfactant is commonly used in the preparation of polyurethane foam, it can be used without special restrictions, for example, a silicone-based surfactant can generally be used. The silicone-based surfactant can be one or more selected from silicone oil and its derivatives, and specifically can be a polyoxyalkylene methylsiloxane copolymer.

[0040] In a specific embodiment, in the polyol premix composition, the content of the foaming surfactant can be 0.01-5 parts by weight, more preferably 0.1-2.5 parts by weight, based on 100 parts by weight of the polyol mixture. When the amount of the foaming surfactant is too small, there is a problem of uneven foam molding. On the other hand, when the amount of the foaming surfactant is too large, the problem of foam shrinkage may occur.

[0041] As for the blowing agent used in the present invention, a known blowing agent component generally used for preparing rigid polyurethane foam can be appropriately selected and used in consideration of various physical properties of the desired foam. In the present invention, water can be representatively used as such blowing agent. In addition, a blowing agent selected from methylene chloride, n-butane, isobutane, n-pentane, isopentane, dimethyl ether, acetone, carbon dioxide and a combination thereof can be used. Such blowing agent can be appropriately used according to a known method of use and according to the density or other characteristics of the desired foam.

[0042] In the polyol premix composition, the amount of the blowing agent used is not particularly limited. For example, based on 100 parts by weight of the polyol mixture, 0.1-40 parts by weight, more specifically 0.5-35 parts by weight of the blowing agent can be used, but it is not limited thereto. According to a specific embodiment of the present invention, based on 100 parts by weight of the polyol, 0.8-5.0 parts by weight of water can be used alone as the blowing agent, or a mixture of the water and 0.1-30 parts by weight of a hydrofluorocarbon can be used.

[0043] In a specific embodiment, the polyol premix composition may further include a flame retardant.

[0044] In a specific embodiment, the flame retardant can use a phosphate-based flame retardant, a phosphonate-based flame retardant, a phosphinate-based flame retardant, a polysiloxane-based flame retardant, a phosphazene-based flame retardant, a melamine-based flame retardant or a combination thereof, and more specifically a phosphate-based flame retardant can be used, but it is not particularly limited thereto.

[0045] In the polyol premix composition, there is no particular limitation on the amount of the flame retardant used. For example, based on 100 parts by weight of the polyol mixture, 1-30 parts by weight, more specifically 5-25 parts by weight of the flame retardant can be used, but it is not limited thereto.

[0046] Furthermore, in a specific embodiment, in addition to the above ingredients, the polyol premix composition may further include auxiliary additives selected from colorants, ultraviolet (UV) stabilizers, thickeners, foam stabilizers, fillers, and combinations thereof.

[0047] The polyisocyanate contained in the polyurethane foam-forming composition of the present invention can be used without particular limitation as long as it is a polyisocyanate for preparing polyurethane foam. Therefore, for example, a polyisocyanate selected from aliphatic polyisocyanates, alicyclic polyisocyanates, araliphatic polyisocyanates, aromatic polyisocyanates, heterocyclic polyisocyanates and combinations thereof can be used, and unmodified polyisocyanates or modified polyisocyanates can be used.

[0048] Specifically, the polyisocyanate can be selected from methylene diisocyanate, ethylene diisocyanate, 1,4-tetramethylene diisocyanate, 1,6-hexamethylene diisocyanate, 1,12-dodecane diisocyanate, cyclobutane-1,3-diisocyanate, cyclohexane-1,3-diisocyanate, cyclohexane-1,4-diisocyanate, isophorone diisocyanate, 2,4-hexahydrotoluene diisocyanate, 2,6-hexahydrotoluene diisocyanate, Isocyanate, dicyclohexylmethane-4,4'-diisocyanate (HMDI), 1,3-phenylene diisocyanate, 1,4-phenylene diisocyanate, 2,4-toluene diisocyanate, 2,6-toluene diisocyanate, diphenylmethane-2,4'-diisocyanate, diphenylmethane-4,4'-diisocyanate, polymeric methylene diphenyl diisocyanate (PMDI), naphthalene-1,5-diisocyanate and combinations thereof. In a specific embodiment, the polyisocyanate can use polymeric methylene diphenyl diisocyanate (PMDI) containing isomers.

[0049] In the present invention, the amount of polyisocyanate used is preferably an amount that makes the isocyanate index 70 to 130, particularly preferably an amount that makes the isocyanate index 80 to 120, and more preferably an amount that makes the isocyanate index 90 to 110. The isocyanate index is the ratio of the equivalent number of isocyanates in the urethane reactant to the equivalent number of hydroxyl groups present in the polyol, and refers to the amount of isocyanates used relative to the theoretical equivalent. When the isocyanate index is less than 100, it means that there is an excess of polyol, and when the isocyanate index exceeds 100, it means that there is an excess of isocyanates. When the isocyanate index is less than 70, the reactivity is reduced and the gelation reaction is delayed, so there is a problem of being unable to cure, and when the isocyanate index exceeds 130, the hard segment (hard segment) is excessively increased, so there is a problem of shrinkage.

[0050] In the two-component type polyurethane foam-forming composition of the present invention, the first component and the second component may exist independently without contacting each other, or they may be mixed immediately before use or mixed in situ.

[0051] According to another aspect of the present invention, a method for preparing a polyurethane foam and a polyurethane foam prepared thereby, for example, a rigid polyurethane foam, are provided. The method for preparing the polyurethane foam comprises the steps of mixing and reacting a polyol premix composition and a polyisocyanate.

[0052] In the polyurethane foam and preparation method thereof of the present invention, the polyol premix composition comprises: a polyol mixture consisting of dehydrated sugar alcohol and polyols other than dehydrated sugar alcohol; an amine catalyst; a foaming surfactant; and a blowing agent, wherein the polyol mixture comprises the dehydrated sugar alcohol in an amount of more than 5 parts by weight to less than 35 parts by weight based on 100 parts by weight of the polyol mixture, and the specific types and usage amounts of these components are as described above.

[0053] In addition, the polyol premix composition may further include an organometallic catalyst, a flame retardant or a combination thereof as described above, and may further include auxiliary additives selected from colorants, ultraviolet (UV) stabilizers, thickeners, foam stabilizers, fillers and combinations thereof.

[0054] In a specific embodiment, the polyurethane foam of the present invention can be prepared by adding polyisocyanate to the polyol premix composition and stirring, and then adding it into a mold and performing curing and foaming.

[0055] There are no particular limitations on the equipment and conditions (temperature, time, etc.) used in the preparation of the polyurethane foam, and commonly used equipment and conditions may be used as they are or after making appropriate changes.

[0056] In a specific embodiment, due to the heat of urethane foaming reaction, the polyurethane foam can be cured at high temperature, preferably at 100-180° C. or 120-180° C., more preferably at 160-180° C., but not limited thereto.

[0057] Hereinafter, the present invention will be described in more detail by way of examples and comparative examples, but the scope of the present invention is not limited to these examples.

[0058] [Example]

[0059] Examples 1 to 5 and Comparative Examples 1 to 5

[0060] Isosorbide (ISB) as an anhydrosugar alcohol, a polyol other than anhydrosugar alcohol (JOP-0655), a flame retardant, a foaming surfactant, a catalyst and a blowing agent were mixed according to the components and content ratios shown in Table 1 below, and fully mixed at a stirring speed of 3000 rpm for 1-3 minutes to prepare a polyol premix composition.

[0061] Polyisocyanate was added to the prepared polyol premix composition, and the mixture was stirred at a stirring speed of 3000 rpm for 7 to 10 seconds to prepare a polyurethane foam-forming composition.

[0062] A polyethylene film was laid in a square shape in a square box mold of 200 mm × 200 mm × 25 mm, and the prepared polyurethane foam-forming composition was poured thereon to prepare polyurethane foam. At this time, a stopwatch was used to measure and record the reaction start time (cream time), tack free time, and gel time to observe whether the foam was formed normally. In addition, a flat plate heat flow meter was used to measure the thermal conductivity (kcal / mh°C) of the prepared 200 mm × 200 mm × 25 mm polyurethane foam, and the molding density (kg / m 3 ). The observation and measurement results are shown in Table 1 below.

[0063] <Ingredients>

[0064] 1) Polyols

[0065] -JOP-0655: polyol, 5.2-functional regenerative polyol with a hydroxyl value of 420-460 mgKOH / g (Jungwoo Fine Co., Ltd., product name: JOP-0655)

[0066] - Isosorbide: polyol, bifunctional biopolyol with a hydroxyl value of 767.8 mgKOH / g (Samyang Innochem Co., Ltd., product name: NOVASORB)

[0067] 2) Flame retardant

[0068] TCPP: Phosphorus-based flame retardant, Tris(1-Chloro-2-Propyl)Phosphate) (Sigma-Aldrich)

[0069] 3) Foaming surfactant

[0070] B-8462: Silicone-based foaming surfactant (Evonik Industries, product name: TEGOSTAB B-8462)

[0071] 4) Catalyst

[0072] -PC-5: Amine catalyst, Pentamethyldiethylenetriamine (SEHOTECH Co., Ltd., product name: ES CAT PC-5)

[0073] -PC-8: Amine catalyst, N,N-dimethylcyclohexylamine (SEHOTECH Co., Ltd., product name: ES CAT PC-8)

[0074] 5) Foaming agent

[0075] -365 / 227: Physical foaming agent, a mixture of SOLKANE 365 and SOLKANE 227 (SOLVAY, product name: SOLKANE 365 / 227)

[0076] -water

[0077] 6) Isocyanate

[0078] pMDI: Methylene diphenyl diisocyanate (BASF, product name: Lupranate MI) which is a mixture of 2,4-methylene diphenyl isocyanate and 4,4'-methylene diphenyl isocyanate monomers

[0079] [Table 1] (Unit of component content: parts by weight)

[0080]

[0081] [Table 1] (Continued) (Unit of component content: parts by weight)

[0082]

[0083] - Cream time (seconds): refers to the time from the moment the polyurethane foam stock solution is mixed to the moment the stock solution begins to expand.

[0084] -Viscosity disappearance time (seconds): refers to the time required from the beginning of expansion of the polyurethane foam stock solution to the disappearance of viscosity.

[0085] - Gel time (seconds): refers to the time required from the moment the polyurethane stock solution is mixed to the time when the stock solution reaches a state with a gel strength that can withstand slight impact and has a stable spatial shape (specifically, it refers to the time point when at least 3-4 urethane fibers are brought out together when the foam is poked with a wooden chopstick).

[0086] As shown in Table 1, in the case of Examples 1 to 5 according to the present invention, it was confirmed that the foam state was good, the thermal conductivity was reduced, and the thermal insulation properties were improved.

[0087] However, in the case of Comparative Examples 1 to 4, the thermal conductivity was high and the heat insulation effect was poor. In the case of Comparative Example 5, it was confirmed that the flaky anhydrosugar alcohol was not completely dissolved in the polyol (JOP-0655), cell cracks occurred, foam could not be formed, and the foam collapsed.

Claims

1. A two-component composition for forming a polyurethane foam, comprising: a polyol premix composition as a first component; and As the second component, polyisocyanate, in, The polyol premix composition comprises: a polyol mixture consisting of anhydrosugar alcohol and a polyol other than anhydrosugar alcohol; an amine catalyst; a foaming surfactant; and a foaming agent, The polyol mixture includes the anhydrosugar alcohol in an amount of more than 5 parts by weight to less than 35 parts by weight, based on 100 parts by weight of the polyol mixture.

2. The two-component composition for forming a polyurethane foam according to claim 1, wherein The anhydrosugar alcohol is selected from isosorbide, isomannide, isoidide and a mixture thereof.

3. The two-component composition for forming a polyurethane foam according to claim 1, wherein The polyol other than the anhydrosugar alcohol is selected from the group consisting of polyether polyol, polyester polyol, polymer polyol obtained by polymerizing the polyether polyol or polyester polyol and a vinyl compound, recycled polyol, and combinations thereof.

4. The two-component composition for forming a polyurethane foam according to claim 1, wherein The amine catalyst is a tertiary amine catalyst.

5. The two-component composition for forming a polyurethane foam according to claim 1, wherein The polyol premix composition also includes an organometallic catalyst.

6. The two-component composition for forming a polyurethane foam according to claim 1, wherein The organometallic catalyst is an organotin catalyst.

7. The two-component composition for forming a polyurethane foam according to claim 1, wherein The foaming surfactant is a silicone-based surfactant.

8. The two-component composition for forming a polyurethane foam according to claim 1, wherein The blowing agent is selected from the group consisting of water, methylene chloride, n-butane, isobutane, n-pentane, isopentane, dimethyl ether, acetone, carbon dioxide and combinations thereof.

9. The two-component composition for forming a polyurethane foam according to claim 1, wherein The polyisocyanate is selected from methylene diisocyanate, ethylene diisocyanate, 1,4-tetramethylene diisocyanate, 1,6-hexamethylene diisocyanate, 1,12-dodecane diisocyanate, cyclobutane-1,3-diisocyanate, cyclohexane-1,3-diisocyanate, cyclohexane-1,4-diisocyanate, isophorone diisocyanate, 2,4-hexahydrotoluene diisocyanate, 2,6-hexahydrotoluene diisocyanate. Esters, dicyclohexylmethane-4,4'-diisocyanate (HMDI), 1,3-phenylene diisocyanate, 1,4-phenylene diisocyanate, 2,4-toluene diisocyanate, 2,6-toluene diisocyanate, diphenylmethane-2,4'-diisocyanate, diphenylmethane-4,4'-diisocyanate, polymeric methylene diphenyl diisocyanate (PMDI), naphthalene-1,5-diisocyanate, and combinations thereof.

10. The two-component composition for forming a polyurethane foam according to any one of claims 1 to 9, wherein The polyol premix composition also includes a flame retardant.

11. The two-component composition for forming a polyurethane foam according to claim 10, wherein: The polyol premix composition further comprises auxiliary additives selected from the group consisting of colorants, ultraviolet (UV) stabilizers, thickeners, foam stabilizers, fillers, and combinations thereof.

12. A method for preparing polyurethane foam, comprising the steps of mixing and reacting a polyol premix composition and a polyisocyanate, wherein the polyol premix composition comprises: a polyol mixture consisting of anhydrosugar alcohol and a polyol other than anhydrosugar alcohol; an amine catalyst; a foaming surfactant; and a foaming agent, The polyol mixture includes the anhydrosugar alcohol in an amount of more than 5 parts by weight to less than 35 parts by weight based on 100 parts by weight of the polyol mixture.

13. A polyurethane foam prepared by reacting a polyol premix composition and a polyisocyanate, wherein the polyol premix composition comprises: a polyol mixture consisting of anhydrosugar alcohol and a polyol other than anhydrosugar alcohol; an amine catalyst; a foaming surfactant; and a foaming agent, The polyol mixture includes the anhydrosugar alcohol in an amount of more than 5 parts by weight to less than 35 parts by weight based on 100 parts by weight of the polyol mixture.

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