Environmentally friendly polyurethane foam-forming composition with improved thermal insulation properties and method for producing polyurethane foam

Abstract

The present invention relates to an environmentally friendly polyurethane foam-forming composition with improved thermal insulation properties and a method for producing polyurethane foam. More specifically, the present invention relates to a two-component polyurethane foam-forming composition that contains a polyol premix composition containing a natural source-derived anhydrosugar alcohol, particularly isosorbide, within a specific range, thereby enabling the formation of an environmentally friendly polyurethane foam with improved general physical properties, including the foam state, and improved thermal insulation properties at the same time, a method for producing polyurethane foam using the same, and the environmentally friendly polyurethane foam produced thereby.

Description

[Technical Field]

[0001] The present invention relates to an environmentally friendly polyurethane foam-forming composition having improved heat insulating properties and a method for producing polyurethane foam. More specifically, the present invention relates to a two-component polyurethane foam-forming composition that contains a polyol premix composition containing an anhydrosugar alcohol derived from a natural source, particularly isosorbide, within a specific range, and thereby can form an environmentally friendly polyurethane foam having improved general physical properties including the foam state and improved heat insulating properties at the same time; a method for producing polyurethane foam using the same; and an environmentally friendly polyurethane foam produced thereby. [Background technology]

[0002] In general, rigid polyurethane foam is lightweight and has excellent heat insulation, soundproofing, and moldability, and is therefore widely used as a cooling material for refrigerators, refrigerated containers, and LNG ships, as well as for building insulation, insulating materials, and other decorative items. Rigid polyurethane foam is primarily used as a heat insulation material, and high flame retardancy is required when used as an interior material for buildings.

[0003] To improve the flame retardancy of rigid polyurethane foam, it is essential to use polymeric MDI as the isocyanate raw material and an aromatic ester polyol liquid as the polyol raw material. By reacting polymeric MDI with aromatic ester polyol to produce a polyurethane product, rigid polyurethane foam with excellent flame retardancy can be produced. From this perspective, manufacturers of home appliances, ships, building and construction materials, and other products recognize the use of environmentally friendly materials in their manufacturing processes as an important product performance. Furthermore, in order to reduce carbon dioxide emissions, prevent global warming, and prepare for the depletion of fossil fuels, interest in biomaterials that can reduce carbon dioxide and harmful gases is growing, and research into these materials is actively underway. Biomaterials are known to suppress the generation of carbon dioxide and volatile organic compounds, are highly biodegradable, and can reduce the use of fossil fuels.

[0004] Polyurethane is produced by a polymerization reaction of isocyanate and polyol as the main components, during which the isocyanate group of the isocyanate compound reacts with the hydroxyl group of the polyol. Polyurethane foam is produced by simultaneously mixing and foaming isocyanate, polyol, water, additives, etc., or by the prepolymer method, in which a polyol and diisocyanate are reacted to produce a prepolymer, which is then mixed with a catalyst, a blowing agent, and additives and foamed.

[0005] Typical isocyanate compounds used in the production of polyurethane foam include toluene diisocyanate (TDI) and methylene diphenyl diisocyanate (MDI). TDI is a blend of 2,4-TDI and 2,6-TDI isomers in an 80:20 wt% ratio. While TDI and MDI share some similar properties, they also each have their own unique physicochemical properties. Therefore, depending on the intended use of polyurethane foam, TDI and MDI can be used selectively, or in combination with their derivatives. Meanwhile, due to various factors, including the accelerating depletion of petroleum resources, the need to reduce greenhouse gas emissions due to climate change, rising raw material prices, and the growing need for renewable raw materials, there is a demand for partial or complete replacement of petroleum-based raw materials in the urethane industry (polyols such as polyether polyols and polyester polyols) and in the isocyanate industry (polyols and isocyanates) with environmentally friendly components.

[0006] Patent Document 1 discloses a technique for improving the breathability and antioxidant properties of a two-component polyurethane foam-forming composition containing a polyol component and a polyisocyanate component by incorporating a small amount (1 to 5 parts by weight) of an anhydrosugar alcohol per 100 parts by weight of the polyol component. However, polyurethane foams formed from such compositions require further improvement in various required properties, particularly with regard to thermal insulation. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Korean Patent No. 10-2199919 Summary of the Invention [Problem to be solved by the invention]

[0008] The present invention has as its object to solve the problems of the prior art described above, and its object is to provide a polyurethane foam-forming composition that can be used to produce an environmentally friendly polyurethane foam that is excellent in general physical properties such as foam state and at the same time has improved heat insulation properties, and a method for producing a polyurethane foam using the same. [Means for solving the problem]

[0009] In order to achieve the above object, the present invention provides a two-component polyurethane foam-forming composition comprising: a polyol premix composition as a first component; and a polyisocyanate as a second component; the polyol premix composition comprises a polyol mixture comprising an anhydrosugar alcohol and a polyol other than an anhydrosugar alcohol; an amine catalyst; a foam surfactant; and a blowing agent; and the polyol mixture comprises the anhydrosugar alcohol in an amount of more than 5 parts by weight and less than 35 parts by weight per 100 parts by weight of the polyol mixture.

[0010] In one embodiment, the polyol premix composition may further comprise a flame retardant.

[0011] In another aspect of the present invention, there is provided a method for producing a polyurethane foam, comprising a step of mixing and reacting a polyol premix composition with a polyisocyanate, wherein the polyol premix composition comprises a polyol mixture consisting of an anhydrosugar alcohol and a polyol other than an anhydrosugar alcohol; an amine catalyst; a foam surfactant; and a blowing agent, and the polyol mixture comprises the anhydrosugar alcohol in an amount of more than 5 parts by weight and less than 35 parts by weight per 100 parts by weight of the polyol mixture.

[0012] In one embodiment, the polyol premix composition may further comprise a flame retardant.

[0013] In yet another aspect of the present invention, there is provided a polyurethane foam produced by reacting a polyol premix composition with a polyisocyanate, the polyol premix composition comprising: a polyol mixture consisting of an anhydrosugar alcohol and a polyol other than an anhydrosugar alcohol; an amine catalyst; a foam surfactant; and a blowing agent; and the polyol mixture comprises more than 5 parts by weight and less than 35 parts by weight of the anhydrosugar alcohol per 100 parts by weight of the polyol mixture.

[0014] In one embodiment, the polyol premix composition may further comprise a flame retardant. [Effects of the Invention]

[0015] By using the polyurethane foam-forming composition of the present invention, it is possible to produce an environmentally friendly polyurethane foam that is excellent in general physical properties including the foaming state of the foam and also has improved heat insulating properties. BEST MODE FOR CARRYING OUT THE INVENTION

[0016] The present invention will now be described in further detail. The two-component polyurethane foam-forming composition of the present invention comprises a polyol premix composition as a first component; and a polyisocyanate as a second component. The polyol premix composition includes a polyol mixture consisting of an anhydrosugar alcohol and a polyol other than anhydrosugar alcohol, an amine catalyst, a foam surfactant, and a blowing agent.

[0017] The anhydrosugar alcohols used in the present invention are produced from hydrogenated sugars derived from natural sources.

[0018] Hydrogenated sugars (also called 'sugar alcohols') refer to compounds obtained by adding hydrogen to the reducing end group of sugars, generally HOCH2(CHOH) n They have the chemical formula CH2OH (where n is an integer between 2 and 5) and are classified according to the number of carbon atoms into tetritols, pentitols, hexitols, and heptitols (4, 5, 6, and 7 carbon atoms, respectively).

[0019] Of these, hexitols with six carbon atoms include sorbitol, mannitol, iditol, galactitol, etc., and sorbitol and mannitol are extremely useful substances.

[0020] Anhydrosugar alcohols are substances produced by removing one or more water molecules from hydrogenated sugars. Removing one water molecule results in a tetraol form with four hydroxyl groups per molecule, while removing two water molecules results in a diol form with two hydroxyl groups per molecule. These can be produced using starch-derived hexitols.

[0021] Anhydrosugar alcohols have long been attracting attention because they are environmentally friendly substances obtained from renewable natural resources, and research into their production has been ongoing. Among these anhydrosugar alcohols, isosorbide produced from sorbitol currently has the widest range of industrial applications.

[0022] Anhydrosugar alcohols can be used in a variety of fields, including the treatment of heart and vascular diseases, pharmaceuticals such as patch adhesives and mouthwashes, solvents for compositions in the cosmetics industry, and emulsifiers in the food industry. They can also increase the glass transition temperature of polymeric materials such as polyester, PET, polycarbonate, polyurethane, and epoxy resins, thereby improving the strength of such materials. Furthermore, because anhydrosugar alcohols are environmentally friendly materials derived from natural sources, they are extremely useful in the plastics industry, including bioplastics. Anhydrosugar alcohols are also known to be useful as adhesives, environmentally friendly plasticizers, biodegradable polymers, and environmentally friendly solvents for water-soluble lacquers. Thus, anhydrosugar alcohols have attracted considerable interest due to their wide range of applications, and their practical industrial applications are becoming increasingly widespread.

[0023] In the present invention, the anhydrosugar alcohol may be a dianhydrohexitol, which is a dehydrated hexitol, and is more preferably one selected from isosorbide (1,4:3,6-dianhydrosorbitol), isomannide (1,4:3,6-dianhydromannitol), isoidide (1,4:3,6-dianhydroiditol), and mixtures thereof, and isosorbide is the most preferred.

[0024] As the polyol other than the anhydrosugar alcohol, a polyol having an average active hydrogen number of 3 or more (preferably 2 to 6) and an active hydrogen equivalent of 100 to 2,000, which is usually used in the production of polyurethane foam, can be used. More specifically, one or more selected from the group consisting of polyether polyols, polyester polyols, polymer polyols obtained by polymerizing the above polyols with vinyl compounds, recycled polyols, and combinations thereof can be used. According to one embodiment, recycled polyols, polyether polyols, or polyether polymer polyols obtained by polymerizing polyether polyols with vinyl compounds are preferably used.

[0025] Polyols other than anhydrosugar alcohols may be used alone or in combination, and preferably, polymer polyols may be used to control the physical properties of rigid polyurethane foams. For example, by grafting a polyvinyl filler onto a polyester polyol or a polyether polyol, a polymer polyol in the form of a stable suspension can be obtained. Examples of vinyl compounds that can be used to produce polymer polyols include acrylonitrile, styrene monomer, and methyl methacrylonitrile. Preferably, acrylonitrile can be used alone or in a mixture with styrene monomer. The amount of vinyl compound in the polymer polyol may be 20 to 50% by weight.

[0026] In the present invention, the polyol mixture contains the anhydrosugar alcohol in an amount of more than 5 parts by weight and less than 35 parts by weight per 100 parts by weight of the polyol mixture. If the amount of anhydrosugar alcohol per 100 parts by weight of the polyol mixture is 5 parts by weight or less, the foamability of the polyurethane foam will be relatively reduced, and the heat insulating properties will be poor. Conversely, if the amount of anhydrosugar alcohol is 35 parts by weight or more, the foam will collapse during foam formation and will not have a normal foam shape.

[0027] In one embodiment, the amount of anhydrosugar alcohol contained in 100 parts by weight of the polyol mixture may 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 may be less than 35 parts by weight, 34.9 parts by weight or less, 34.5 parts by weight or less, 34 parts by weight or less, 33.5 parts by weight or less, 33 parts by weight or less, 32.5 parts by weight or less, 32 parts by weight or less, 31.5 parts by weight or less, 31 parts by weight or less, 30.5 parts by weight or less, or 30 parts by weight or less, but is not limited to these.

[0028] The amine catalyst used in the present invention serves to promote the reaction between the polyol and the isocyanate compound. In the present invention, the type of amine catalyst is not particularly limited, but may be a tertiary amine catalyst or a mixture of two or more thereof, more specifically, may be selected from the group consisting of triethylenediamine, triethylamine, N-methylmorpholine, N-ethylmorpholine, and combinations thereof.

[0029] In one embodiment, the polyol premix composition may contain 0.01 to 5 parts by weight, more preferably 0.1 to 3 parts by weight, of the amine catalyst per 100 parts by weight of the polyol mixture. If the amount of amine catalyst used is too small, the reaction may be delayed, resulting in poor curing or foam collapse during formation. Conversely, if the amount is too large, the reaction may be too fast or shrinkage may occur.

[0030] In one embodiment, the polyol premix composition may further comprise an organometallic catalyst.

[0031] When an organometallic catalyst is used in the present invention, it serves to promote the reaction between the polyol and the isocyanate compound.

[0032] The organometallic catalyst that can be used in the present invention may be any organometallic catalyst that has been conventionally used in the production of polyurethane foams, such as, but not limited to, an organotin catalyst (more specifically, dibutyltin dilaurate (DBTDL) or tin bis[2-ethylhexanoate]).

[0033] In one embodiment, when the polyol premix composition further comprises an organometallic catalyst, the amount thereof may be, for example, 0.01 to 5 parts by weight, more specifically 0.1 to 3 parts by weight, per 100 parts by weight of the polyol mixture, but is not limited thereto. If the amount of organometallic catalyst used is too small, the effect of use may be insufficient. Conversely, if the amount is too large, the reaction may be too fast or shrinkage may occur.

[0034] The foam surfactant used in the present invention prevents the coalescence or destruction of the cells formed inside the polyurethane foam and plays a role in regulating the formation of cells of uniform shape and size. In the present invention, the type of foam surfactant is not particularly limited as long as it is one that has been conventionally used in the production of polyurethane foams, and for example, silicone-based surfactants can generally be used. The silicone-based surfactant may be one or more selected from silicone oils and their derivatives, and specifically may be a polyalkylene oxide methyl siloxane copolymer.

[0035] In one embodiment, the polyol premix composition may contain the foam surfactant in an amount of 0.01 to 5 parts by weight, more preferably 0.1 to 2.5 parts by weight, per 100 parts by weight of the polyol mixture. If the amount of foam surfactant used is too small, problems such as uneven foam formation may occur, while if the amount is too large, problems such as foam shrinkage may occur.

[0036] The blowing agent used in the present invention can be appropriately selected from known blowing agent components conventionally used in the production of rigid polyurethane foams, taking into consideration the various physical properties required of the foam. In the present invention, water is a representative blowing agent, but other blowing agents can also be selected from the group consisting of methylene chloride, n-butane, isobutane, n-pentane, isopentane, dimethyl ether, acetone, carbon dioxide, and combinations thereof. Such blowing agents can be appropriately selected depending on the known method of use, the required density or other properties of the foam, etc.

[0037] The amount of the blowing agent used in the polyol premix composition is not particularly limited, and may be, for example, 0.1 to 40 parts by weight, more specifically 0.5 to 35 parts by weight, per 100 parts by weight of the polyol mixture, but is not limited thereto. According to one embodiment of the present invention, 0.8 to 5.0 parts by weight of water alone or a mixture of 0.1 to 30 parts by weight of water and a hydrofluorocarbon may be used per 100 parts by weight of the polyol.

[0038] In one embodiment, the polyol premix composition may further comprise a flame retardant.

[0039] In one embodiment, the flame retardant may be a phosphate-based flame retardant, a phosphonate-based flame retardant, a phosphinate-based flame retardant, a polysiloxane-based flame retardant, a phosphegene-based flame retardant, a melamine-based flame retardant, or a combination thereof. More specifically, the flame retardant may be a phosphate-based flame retardant, but is not limited thereto.

[0040] The amount of the flame retardant used in the polyol premix composition is not particularly limited, and may be, for example, 1 to 30 parts by weight, more specifically 5 to 25 parts by weight, per 100 parts by weight of the polyol mixture, but is not limited thereto.

[0041] In one embodiment, in addition to the components described above, the polyol premix composition may further include an auxiliary additive selected from the group consisting of a colorant, a UV stabilizer, a thickener, a foam stabilizer, a filler, and combinations thereof.

[0042] The polyisocyanate contained in the polyurethane foam-forming composition of the present invention may be any polyisocyanate that can be used for producing polyurethane foam, without any particular limitation. For example, polyisocyanates selected from aliphatic polyisocyanates, alicyclic polyisocyanates, araliphatic polyisocyanates, aromatic polyisocyanates, heterocyclic polyisocyanates, and combinations thereof may be used. It is also possible to use unmodified or modified polyisocyanates.

[0043] Specifically, the polyisocyanate may be 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, The polyisocyanate may be selected from the group consisting of 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 one embodiment, polymeric methylene diphenyl diisocyanate (PMDI), including isomers, may be used as the polyisocyanate.

[0044] In the present invention, the amount of polyisocyanate used is preferably an amount that results in an isocyanate index of 70 to 130, more preferably an amount that results in an isocyanate index of 80 to 120, and even more preferably an amount that results in an isocyanate index of 90 to 110. The isocyanate index is the ratio of the number of hydroxy group equivalents present in the polyol in the urethane reactant to the number of isocyanate equivalents, and refers to the amount of isocyanate used relative to the theoretical equivalent. An isocyanate index of less than 100 means that an excessive amount of polyol is present, while an isocyanate index of more than 100 means that an excessive amount of isocyanate is present. If the isocyanate index is less than 70, there is a problem that reactivity decreases, delaying the gelation reaction and preventing curing, while if the isocyanate index exceeds 130, there is a problem that hard segments increase excessively, causing shrinkage.

[0045] In the two-component polyurethane foam-forming composition of the present invention, the first and second components may be present separately without contact, or may be mixed immediately before use or on-site. According to another aspect of the present invention, there is provided a method for producing a polyurethane foam, which includes a step of mixing and reacting a polyol premix composition with a polyisocyanate, and a polyurethane foam, for example, a rigid polyurethane foam, produced thereby.

[0046] In the polyurethane foam and its manufacturing method of the present invention, the polyol premix composition includes a polyol mixture consisting of an anhydrosugar alcohol and a polyol other than an anhydrosugar alcohol, an amine catalyst, a foam surfactant, and a blowing agent, and the polyol mixture contains the anhydrosugar alcohol in an amount of more than 5 parts by weight and less than 35 parts by weight per 100 parts by weight of the polyol mixture. The specific types and amounts of these components are the same as those described above.

[0047] The polyol premix composition may further comprise an organometallic catalyst, a flame retardant, or a combination thereof, and may further comprise auxiliary additives selected from the group consisting of colorants, UV stabilizers, thickeners, foam stabilizers, fillers, and combinations thereof.

[0048] In one embodiment, the polyurethane foam of the present invention can be produced by adding a polyisocyanate to the polyol premix composition, stirring the mixture, and then pouring the mixture into a mold to allow curing and foaming to proceed.

[0049] The apparatus and conditions (temperature, time, etc.) used in producing the polyurethane foam are not particularly limited, and conventionally used apparatus and conditions can be used as is or with appropriate modifications.

[0050] In one embodiment, the polyurethane foam may be cured at high temperatures by the heat of the urethane foaming reaction, preferably at temperatures of 100°C to 180°C, or 120°C to 180°C, more preferably 160°C to 180°C, but is not limited thereto.

[0051] The present invention will be described in more detail below with reference to examples and comparative examples, but the scope of the present invention is not limited thereto.

[0052] Example Examples 1 to 5 and Comparative Examples 1 to 5 According to the ingredients and content ratios shown in Table 1 below, isosorbide (ISB) as an anhydrosugar alcohol, a polyol other than anhydrosugar alcohol (JOP-0655), a flame retardant, a foam surfactant, a catalyst, and a blowing agent were mixed and thoroughly mixed at a stirring speed of 3,000 rpm for 1 to 3 minutes to prepare a polyol premix composition.

[0053] Polyisocyanate was added to the produced polyol premix composition, and the mixture was stirred at a stirring speed of 3,000 rpm for 7 to 10 seconds to produce a polyurethane foam-forming composition.

[0054] A square polyethylene film was laid in a square box mold measuring 200 mm x 200 mm x 25 mm, and the polyurethane foam-forming composition prepared above was poured onto the film to produce a polyurethane foam. The reaction start time (cream time), tack-free time, and gel time were measured and recorded with a stopwatch, and it was observed whether the foam had been formed normally. The thermal conductivity (kcal / mh°C) of the produced 200 mm x 200 mm x 25 mm polyurethane foam was also measured with a plate heat flow meter, and the molding density (kg / m 3 ) was measured in accordance with KS-M-6672. The observation and measurement results are shown in Table 1 below.

[0055] <Ingredients used> 1) Polyol JOP-0655: Polyol, 5.2 functional recycled polyol with a hydroxyl value of 420-460 mg KOH / g (manufactured by Jungwoo Fine, product name: JOP-0655) Isosorbide: Polyol, a bifunctional bio-polyol with a hydroxyl value of 767.8 mg KOH / g (manufactured by Samyang Innochem, product name: NOVASORB)

[0056] 2) Flame retardants TCPP: Phosphorus flame retardant, tris(1-chloro-2-propyl)phosphate (Sigma-Aldrich)

[0057] 3) Foam surfactant B-8462: Silicone surfactant (manufactured by Evonik, product name: TEGOSTAB B-8462)

[0058] 4) Catalyst PC-5: Amine catalyst, pentamethyldiethylenetriamine (manufactured by Sefotec, product name: ESCAT PC-5) PC-8: Amine catalyst, N,N-dimethylcyclohexylamine (manufactured by Sefotec, product name: ESCAT PC-8)

[0059] 5) Foaming agent 365 / 227: Physical foaming agent, a blend of Solkan 365 and S Solkan 227 (manufactured by SOLVAY, product name: Solkan 365 / 227) ·water

[0060] 6) Isocyanate pMDI: Methylenediphenyl diisocyanate (manufactured by Basp, product name: Lupranate MI), a mixture of 2,4-methylenediphenyl isocyanate and 4,4'-methylenediphenyl isocyanate monomers

[0061] [Table 1]

[0062] Cream time (seconds): The time from mixing the polyurethane foam concentrate until the concentrate begins to swell. Tack-free time (seconds): This refers to the time from when the polyurethane foam concentrate begins to swell until the tackiness disappears. Gel time (seconds): This refers to the time it takes for the polyurethane foam concentrate to become strong enough to withstand a light impact and take on a stable spatial shape after mixing. Specifically, this refers to the time it takes for at least 3-4 urethane fibers to come out when the foam is poked with a chopstick.

[0063] As shown in Table 1 above, it was confirmed that in Examples 1 to 5 of the present invention, the foam state was good, the thermal conductivity was reduced, and the heat insulation property was improved.

[0064] However, in Comparative Examples 1 to 4, the thermal conductivity was high and the insulating effect was poor, and in Comparative Example 5, the plate-shaped anhydrosugar alcohol did not dissolve completely in the polyol (JOP-0655), causing cell cracks, resulting in failure of foam formation and foam collapse.

Claims

1. A two-component polyurethane foam-forming composition comprising: a polyol premix composition as a first component; and a polyisocyanate as the second component; Including, the polyol premix composition comprises a polyol mixture consisting of an anhydrosugar alcohol and a polyol other than anhydrosugar alcohol; an amine catalyst; a foam surfactant; and a blowing agent; The two-component polyurethane foam-forming composition, wherein the polyol mixture contains the anhydrosugar alcohol in an amount of more than 5 parts by weight and less than 35 parts by weight per 100 parts by weight of the polyol mixture.

2. 2. The two-component polyurethane foam-forming composition according to claim 1, wherein the anhydrosugar alcohol is selected from the group consisting of isosorbide, isomannide, isoidide, and mixtures thereof.

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

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

5. 10. The two-component polyurethane foam-forming composition according to claim 1, wherein the polyol premix composition further comprises an organometallic catalyst.

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

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

8. 2. The two-component polyurethane foam-forming composition of 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 polyisocyanate may be 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, dicyclohexylmethane-4,4 2. The two-component polyurethane foam-forming composition of claim 1, wherein the diisocyanate is selected from the group consisting of 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 methylenediphenyl diisocyanate (PMDI), naphthalene-1,5-diisocyanate, and combinations thereof.

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

11. 11. The two-component polyurethane foam-forming composition of claim 10, wherein the polyol premix composition further comprises an auxiliary additive selected from the group consisting of colorants, UV stabilizers, thickeners, foam stabilizers, fillers, and combinations thereof.

12. A method for producing a polyurethane foam, comprising: The method includes a step of mixing and reacting a polyol premix composition with a polyisocyanate, the polyol premix composition comprises a polyol mixture consisting of an anhydrosugar alcohol and a polyol other than anhydrosugar alcohol; an amine catalyst; a foam surfactant; and a blowing agent; The method for producing a polyurethane foam, wherein the polyol mixture contains the anhydrosugar alcohol in an amount of more than 5 parts by weight and less than 35 parts by weight per 100 parts by weight of the polyol mixture.

13. A polyurethane foam, It is produced by reacting a polyol premix composition with a polyisocyanate, the polyol premix composition comprises a polyol mixture consisting of an anhydrosugar alcohol and a polyol other than anhydrosugar alcohol; an amine catalyst; a foam surfactant; and a blowing agent; The polyurethane foam, wherein the polyol mixture contains the anhydrosugar alcohol in an amount of more than 5 parts by weight and less than 35 parts by weight per 100 parts by weight of the polyol mixture.

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