A polyol composition, a foaming composition, and a preparation method and application thereof

Abstract

The present invention provides a polyol composition, a foaming composition, a preparation method and an application thereof. Based on 100 parts by total weight, the polyol composition comprises the following components: 60 parts of polyether polyol and 5 - 40 parts of modified polyol; the preparation raw materials of the modified polyol include vinyl polymer grafted polyether polyol, alkoxysilane functionalized isocyanate and silica with active groups on the surface. By using the polyol composition provided in the present invention to prepare polyurethane foam, the obtained polyurethane foam has excellent water vapor permeability, fast drying speed for water, fast water absorption speed and good resilience.

Description

Technical Field

[0001] The invention belongs to the technical field of polyurethane materials, and specifically relates to a polyol composition, a foaming composition, and a preparation method and application thereof. Background Art

[0002] When polyurethane foam is used in clothing pads, mattresses, pillows, vehicle seat cushions and other parts, it is required to have good water vapor permeability, water absorption, quick drying and resilience. In most cases, it is in contact with the human body for a long time. If the water vapor permeability of the polyurethane foam is poor, it will make the human body feel "stuffy" over time and cannot provide a comfortable feeling of use.

[0003] CN113121776A discloses a sweat-absorbing and breathable polyurethane sponge and a preparation method thereof, and a bra, wherein the sweat-absorbing and breathable polyurethane sponge is prepared from the following raw materials in parts by weight: 100-160 parts of polyethylene glycol methyl ether, 20-70 parts of toluene diisocyanate, 8-15 parts of water, 2.3-4.8 parts of silicone oil, 0.2-1.6 parts of surfactant, 0.05-0.45 parts of amine catalyst, 3-7 parts of foaming agent, 3.2-8.6 parts of plant protein and 6.4-15.6 parts of hydrophilic cellulose; wherein the hydrophilic cellulose is selected from at least one of carboxymethyl cellulose, hydroxyethyl cellulose and hydroxypropyl methyl cellulose. The technical solution obtains excellent water absorption and air permeability of the polyurethane sponge obtained by adding plant protein and hydrophilic cellulose, but the plant protein has poor stability and high cost, and some people will have allergic reactions after contact, resulting in limited use.

[0004] CN111040113A discloses a hydrophilic sponge material and a preparation method thereof. The hydrophilic sponge material, by weight, has a raw material formula consisting of: 0-100 parts of polyether polyol, 0-50 parts of polymer polyol, 10-100 parts of hydrophilic polyol, 0.1-8 parts of water, 0.1-2 parts of catalyst, 0.1-8 parts of hydrophilic silicone oil, 5-30 parts of hydrophilic auxiliary agent, and 10-100 parts of diisocyanate. The technical solution uses hydrophilic polyol, hydrophilic silicone oil, and hydrophilic auxiliary agent to synthesize a hydrophilic functional polyurethane sponge, which has rapid water absorption and high air permeability, but can sink to the bottom of the water after saturated water absorption, and it is difficult to support the rapid drying performance of the hydrophilic sponge material.

[0005] Therefore, it is necessary to develop a polyol composition that can improve the water vapor permeability, water absorption, quick drying and resilience of polyurethane foam. Summary of the invention

[0006] In view of the shortcomings of the prior art, the present invention aims to provide a polyol composition, a foaming composition and a preparation method and application thereof. By using the polyol composition to prepare polyurethane foam, the prepared polyurethane foam has excellent water vapor permeability, fast drying speed to water, fast water absorption speed and good resilience.

[0007] To achieve this object, the present invention adopts the following technical solutions:

[0008] In a first aspect, the present invention provides a polyol composition, which comprises the following components based on 100 parts by total weight: 60 parts of polyether polyol and 5 to 40 parts (for example, 10 parts, 15 parts, 20 parts, 25 parts, 30 parts or 35 parts, etc.) of modified polyol; the raw materials for preparing the modified polyol include vinyl polymer grafted polyether polyol (commonly known as polymer polyol, abbreviated as POP), alkoxysilane functionalized isocyanate and silica with active groups on the surface.

[0009] In the present invention, the polyol composition formed by compounding components such as polyether polyol and modified polyol is applied to the preparation of polyurethane foam, and the prepared polyurethane foam has the characteristics of good water vapor permeability, fast water drying speed, fast water absorption speed and good resilience. The application of the polyurethane foam in the fields of clothing pads, sports underwear, etc. can bring a relatively good comfort to the wearer.

[0010] Preferably, the weight proportion of the modified polyol in the polyol composition is 20 to 40 parts, more preferably 25 to 35 parts.

[0011] In the present invention, when the weight proportion of the modified polyol in the polyol composition is preferably 25 to 35 parts, the water vapor permeability of the polyurethane foam prepared by using the polyol composition is better.

[0012] Preferably, the modified polyol is prepared by the following method:

[0013] (1) A vinyl polymer grafted polyether polyol and an alkoxysilane functionalized isocyanate are mixed and reacted to obtain a polyol type compound having a silane modified structure.

[0014] (2) The polyol compound having a silane-modified structure in step (1) and silicon dioxide having active groups on the surface are mixed and reacted to obtain the modified polyol.

[0015] Preferably, the number-average molecular weight of the vinyl polymer grafted polyether polyol is 800 to 12,000 g / mol (such as 1,200 g / mol, 2,400 g / mol, 3,600 g / mol, 4,800 g / mol, 5,000 g / mol, 6,200 g / mol, 7,400 g / mol, 8,600 g / mol, 9,800 g / mol or 11,000 g / mol, etc.).

[0016] Preferably, the functionality of the vinyl polymer grafted polyether polyol is ≥2, such as 3, 4, 5 or 6, etc.

[0017] Preferably, the content of the vinyl polymer in the vinyl polymer grafted polyether polyol is 10 wt% to 50 wt% (such as 15 wt%, 20 wt%, 25 wt%, 30 wt%, 35 wt%, 40 wt% or 45 wt%, etc.).

[0018] Preferably, the vinyl polymer in the vinyl polymer grafted polyether polyol includes acrylonitrile-styrene copolymer.

[0019] Preferably, the alkoxysilane-functionalized isocyanate has the structure shown in Formula 1 below:

[0020] .

[0021] Preferably, in Formula 1, X is selected from any one of substituted or unsubstituted C1-C18 (such as C2, C4, C6, C8, C10, C12, C14 or C16, etc.) straight-chain or branched-chain alkylene groups, substituted or unsubstituted C3-C18 (such as C4, C6, C8, C10, C12, C14 or C16, etc.) cycloalkylene groups, substituted or unsubstituted C2-C18 non-aromatic heterocyclic groups, substituted or unsubstituted C6-C18 (such as C8, C10, C12, C14 or C16, etc.) arylene groups, and substituted or unsubstituted C3-C18 (such as C4, C6, C8, C10, C12, C14 or C16, etc.) heteroarylene groups.

[0022] Preferably, in Formula 1, R1, R2 and R3 are each independently selected from a substituted or unsubstituted C1-C18 (such as C2, C4, C6, C8, C10, C12, C14 or C16, etc.) alkyl group, a substituted or unsubstituted C6-C18 (such as C8, C10, C12, C14 or C16, etc.) aryl group, a substituted or unsubstituted C3-C18 (such as C4, C6, C8, C10, C12, C14 or C16, etc.) cycloalkyl group, and a substituted or unsubstituted C1-C18 (such as C2, C4, C6, C8, C10, C12, C14 or C16, etc.) alkoxy group. At least one of R1, R2 and R3 is selected from a substituted or unsubstituted C1-C18 alkoxy group.

[0023] Preferably, in Formula 1, R1, R2 and R3 are each independently selected from a substituted or unsubstituted C1-C18 alkoxy group.

[0024] Preferably, when the above groups have substituents, the substituents include any one or at least two combinations of a C1-C10 (such as C2, C3, C4, C5, C6, C7, C8 or C9, etc.) alkyl group, a C6-C12 (such as C7, C8, C9, C10 or C11, etc.) aryl group, or a C4-C10 (such as C5, C6, C7, C8 or C9, etc.) heteroaryl group.

[0025] Preferably, X is selected from any one of methylene, ethylene, propylene or butylene.

[0026] Preferably, R1, R2 and R3 are each independently selected from any one of methyl, ethyl, propyl, butyl, methoxy, ethoxy, propoxy or butoxy, and at least one of R1, R2 and R3 is selected from any one of methoxy, ethoxy, propoxy or butoxy.

[0027] Preferably, before the mixing in step (1), there is also a step of dehydrating the vinyl polymer grafted polyether polyol.

[0028] Preferably, in the vinyl polymer grafted polyether polyol in step (1), the molar ratio of the hydroxyl group to the isocyanate group in the alkoxysilane-functionalized isocyanate is (2-3):1, such as 2.1:1, 2.2:1, 2.3:1, 2.4:1, 2.5:1, 2.6:1, 2.7:1, 2.8:1 or 2.9:1, etc.

[0029] In the present invention, the molar ratio of the hydroxyl groups in the polyol to the isocyanate groups in the alkoxysilane-functionalized isocyanate in step (1) is preferably (2-3):1. If the molar ratio is too small, the amount of alkoxysilane-functionalized isocyanate introduced onto the modified polyol and the silica with active groups on the surface is small, resulting in relatively poor properties of the prepared polyurethane foam. If the molar ratio is too large, the prepared modified polyol undergoes excessive self-polymerization and has a high viscosity, making it difficult to achieve uniform mixing with other components during the preparation of polyurethane foam, and the properties of the prepared polyurethane foam are relatively poor.

[0030] Preferably, the mass ratio of the vinyl polymer-grafted polyether polyol in step (1) to the silica with active groups in step (2) is 100:(1-10), such as 100:2, 100:3, 100:4, 100:5, 100:6, 100:7, 100:8, or 100:9, etc.

[0031] In the present invention, the mass ratio of the polyol in step (1) to the silica with active groups in step (2) is preferably 100:(1-10). If the mass ratio is too large, the amount of silica with active groups introduced onto the modified polyol is small, and the properties of the prepared polyurethane foam are poor. If the mass ratio is too small, the prepared modified polyol has a high viscosity, making it difficult to achieve uniform mixing with other components during the preparation of polyurethane foam, resulting in difficult operation and poor properties of the prepared polyurethane foam.

[0032] Preferably, the mixing in step (1) further includes mixing with a catalyst.

[0033] Preferably, the catalyst in step (1) includes an organotin catalyst.

[0034] Preferably, the organotin catalyst includes stannous octoate and / or dibutyltin dilaurate.

[0035] Preferably, the mass ratio of the catalyst in step (1) to the vinyl polymer-grafted polyether polyol is 100:(0.04-0.08), such as 100:0.045, 100:0.05, 100:0.055, 100:0.06, 100:0.065, 100:0.07, or 100:0.075, etc.

[0036] Preferably, the reactions in steps (1) and (2) are carried out under an inert atmosphere.

[0037] Preferably, the temperature of the reaction in step (1) is 45 to 70 °C (such as 48 °C, 51 °C, 54 °C, 57 °C, 60 °C, 63 °C, 65 °C or 68 °C, etc.), and the reaction time is 2.0 to 5.0 h (such as 2.3 h, 2.6 h, 2.9 h, 3.2 h, 3.5 h, 3.8 h, 4.1 h, 4.4 h or 4.7 h, etc.).

[0038] Preferably, the temperature of the reaction in step (2) is 40 to 65 °C (such as 43 °C, 46 °C, 49 °C, 52 °C, 55 °C, 58 °C, 61 °C or 64 °C, etc.), and the reaction time is 0.5 to 1.5 h (such as 0.6 h, 0.7 h, 0.8 h, 0.9 h, 1.0 h, 1.1 h, 1.2 h, 1.3 h or 1.4 h, etc.).

[0039] Preferably, the alkoxysilane-functionalized isocyanate includes any one or a combination of at least two of isocyanatopropyltrimethoxysilane, isocyanatopropyltriethoxysilane, isocyanatopropyltripropoxysilane, isocyanatopropyltributoxysilane, isocyanatomethyltrimethoxysilane, isocyanatopropylmethyldiethoxysilane or isocyanatopropylmethyldimethoxysilane.

[0040] Preferably, the active groups in the silica with active groups on the surface include hydroxyl groups.

[0041] Preferably, the silica with active groups on the surface includes fumed silica.

[0042] Preferably, the polyol composition further includes vinyl polymer grafted polyether polyol.

[0043] Preferably, the weight parts of the vinyl polymer grafted polyether polyol in the polyol composition are 0 to 35 parts (such as 5 parts, 10 parts, 15 parts, 20 parts, 25 parts or 30 parts, etc.).

[0044] In a second aspect, the present invention provides a foaming composition, and the foaming composition includes the following components: the polyol composition as described in the first aspect, a foaming agent, a foam stabilizer and a catalyst.

[0045] Preferably, the foaming composition comprises the following components in parts by weight: 100 parts of the polyol composition as described in the first aspect, 2.5 - 3.5 parts (such as 2.6 parts, 2.7 parts, 2.8 parts, 2.9 parts, 3.0 parts, 3.1 parts, 3.2 parts, 3.3 parts or 3.4 parts, etc.) of a foaming agent, 1.0 - 1.5 parts (such as 1.05 parts, 1.1 parts, 1.15 parts, 1.2 parts, 1.25 parts, 1.3 parts, 1.35 parts, 1.4 parts or 1.45 parts, etc.) of a foam stabilizer, and 0.3 - 0.8 parts (such as 0.4 parts, 0.5 parts, 0.6 parts or 0.7 parts, etc.) of a catalyst.

[0046] Preferably, the foaming agent includes water.

[0047] Preferably, the water includes deionized water.

[0048] Preferably, the foam stabilizer includes modified silicone oil.

[0049] Preferably, the modified silicone oil includes polyether-modified silicone.

[0050] Preferably, the catalyst in the foaming composition includes any one or a combination of at least two of stannous octoate, bis(dimethylaminoethyl) ether or triethylenediamine, and is further preferably a combination of stannous octoate, bis(dimethylaminoethyl) ether and triethylenediamine.

[0051] In a third aspect, the present invention provides a polyurethane foam, and the raw materials for preparing the polyurethane foam include the foaming composition as described in the second aspect and isocyanate.

[0052] Preferably, the isocyanate includes toluene diisocyanate.

[0053] Preferably, the mass ratio of the foaming composition to the isocyanate is 1:(0.3 - 0.4), such as 1:0.31, 1:0.32, 1:0.33, 1:0.34, 1:0.35, 1:0.36, 1:0.37, 1:0.38 or 1:0.39, etc.

[0054] In a fourth aspect, the present invention provides a method for preparing a polyurethane foam as described in the third aspect, and the preparation method includes the following steps: mixing the foaming composition and the isocyanate, foaming, and curing to obtain the polyurethane foam.

[0055] In a fifth aspect, the present invention provides an application of the polyurethane foam as described in the third aspect in clothing padding materials.

[0056] Compared with the prior art, the present invention has the following beneficial effects:

[0057] In the present invention, a polyol composition formed by compounding components such as polyether polyol and modified polyol is applied to the preparation of polyurethane foam. The obtained polyurethane foam has excellent water vapor permeability, fast drying speed for water, fast water absorption speed, and good resilience. When applied to fields such as clothing padding and sports underwear, it can bring relatively good comfort to the wearer. The water vapor permeability of the polyurethane foam is 356.4~631.2 g / (m 2 min), the average water absorption rate is 66.5%~89.8%, the average drying rate is 61.4%~88.3%, and the resilience rate is 28.6%~44.3%. Preferably, the water vapor permeability is 517.8~631.2 g / (m 2 min), the average water absorption rate is 79.8%~89.8%, the average drying rate is 76.8%~88.3%, and the resilience rate is 37.9%~44.3%. Specific Embodiments

[0058] The technical solution of the present invention will be further described below through specific embodiments. Those skilled in the art should understand that the embodiments are only for helping to understand the present invention and should not be regarded as specific limitations to the present invention.

[0059] The sources of some components in the following preparation examples, examples and comparative examples are as follows:

[0060] (1) Polyether polyol

[0061] Polyether polyol A: functionality 3, number average molecular weight 3000 g / mol, manufacturer is Wudi Dexin, brand is SEP-560L, industrial grade;

[0062] Polyether polyol B: functionality is 3, number average molecular weight is 4800 g / moL, manufacturer is Hongwei Chemical Industry, brand is PHL-3480.

[0063] (2) Vinyl polymer grafted polyether polyol

[0064] POP-1: vinyl polymer grafted polyether polyol, functionality is 3, number average molecular weight is 4800 g / moL, wherein the mass percentage of acrylonitrile-styrene copolymer is 40%~45%, and the solid content is 45%; manufacturer is Hongwei Chemical Industry, brand is PPL-3448;

[0065] POP-2: vinyl polymer grafted polyether polyol, functionality is 3, number average molecular weight is 6000 g / moL, wherein the mass percentage of acrylonitrile-styrene copolymer is 40%~45%, and the solid content is 45%; manufacturer is Hongwei Chemical Industry, brand is PPL-3460;

[0066] POP-3: Vinyl polymer grafted polyether polyol, functionality 3, number average molecular weight 3600 g / moL, of which the mass percentage of acrylonitrile-styrene copolymer is 40%~45%, and the solid content is 45%; the manufacturer is Hongwei Chemical, the brand name is PPL-3436.

[0067] (3) Alkoxysilane functionalized isocyanate

[0068] Propyl triethoxysilane isocyanate, manufactured by Titan Technology, reagent grade;

[0069] Isocyanatepropyltrimethoxysilane, manufactured by Titan Technology, reagent grade;

[0070] Isocyanatepropyltripropoxysilane, manufactured by CoFormula, reagent grade;

[0071] Isocyanatepropylmethyldiethoxysilane, manufacturer: Titan Technology, reagent grade.

[0072] (4) Silica with active groups on the surface: Fumed silica M-5, manufactured by Cabot Corporation of the United States, industrial grade.

[0073] (5) Catalyst

[0074] Stannous octoate: brand name is catalyst T-9, manufacturer is Aladdin, reagent grade;

[0075] Bis(dimethylamino)ethyl ether: brand name is catalyst A-1, manufacturer is Momentive Chemical, industrial grade;

[0076] Triethylenediamine: Brand name is catalyst A-33, manufacturer is Momentive Chemical, industrial grade.

[0077] (6) Toluene diisocyanate: brand name is TDI80, manufacturer is Wanhua Chemical, industrial grade.

[0078] (7) Modified silicone oil: polyether modified silicone, brand name M-6698F2, manufacturer: Meside, industrial grade.

[0079] The sources of some of the experimental instruments and equipment used in the following preparation examples, embodiments and comparative examples are as follows:

[0080] Overhung mechanical stirrer, model Eurostar 60 control, manufacturer IKA;

[0081] Constant temperature water bath, model HH-1, manufactured by Guohua;

[0082] Diaphragm vacuum pump, model VACSTAR control, manufacturer IKA;

[0083] High-speed disperser, model SFJ-750, manufactured by Modern Environment.

[0084] Preparation Example 1

[0085] This preparation example provides a modified polyol, specifically modified polyol A. The preparation method of the modified polyol A includes the following steps:

[0086] (1) Add 250 g of vinyl polymer grafted polyether polyol (POP-1) to a 500 mL four-necked flask. Using a cantilever mechanical stirrer at a stirring speed of 100 rpm, introduce nitrogen for bubbling for 0.5 h, and then stop bubbling. Under a nitrogen atmosphere, use a constant temperature water bath to heat the polyether polyol to 120 °C, then stop nitrogen input, and use a diaphragm vacuum pump to reduce the pressure of the reaction system to 0.001 MPa, and carry out vacuum dehydration for 2.0 h;

[0087] Under a nitrogen atmosphere, after cooling the above vinyl polymer grafted polyether polyol system to 60 °C, inject 7.08 g of alkoxysilane-functionalized isocyanate (isocyanatopropyltriethoxysilane), mix at a stirring speed of 100 rpm for 15 min, inject 0.18 g of catalyst (catalyst T-9) under a nitrogen atmosphere, and react at 60 °C and 100 rpm for 4.0 h under a nitrogen atmosphere until the infrared analysis shows that the isocyanate group disappears, obtaining a polyol-type compound with a silane-modified structure.

[0088] (2) Add 5.25 g of fumed silica M-5 to the polyol-type compound with a silane-modified structure prepared in step (1), react at 60 °C and 100 rpm for 1.0 h under a nitrogen atmosphere, cool to 25 °C and then discharge, and store it sealed under a nitrogen atmosphere to obtain the modified polyol.

[0089] The molar ratio of the hydroxyl group in the above vinyl polymer grafted polyether polyol to the isocyanate group in the alkoxysilane-functionalized isocyanate is 3:1.

[0090] The mass ratio of the above vinyl polymer grafted polyether polyol to fumed silica M-5 is 100:2.1.

[0091] Preparation Example 2

[0092] This preparation example provides a modified polyol, specifically modified polyol B. The preparation method of the modified polyol B includes the following steps:

[0093] (1) Add 250 g of vinyl polymer grafted polyether polyol (POP-2) to a 500 mL four-necked flask. Using a cantilever mechanical stirrer at a stirring speed of 100 rpm, introduce nitrogen for bubbling for 0.5 h, and then stop bubbling. Under a nitrogen atmosphere, use a constant temperature water bath to heat the polyether polyol to 120 °C, then stop nitrogen input, and use a diaphragm vacuum pump to reduce the pressure of the reaction system to 0.001 MPa for vacuum dehydration for 2.0 h;

[0094] Under a nitrogen atmosphere, after cooling the above vinyl polymer grafted polyether polyol system to 60 °C, inject 5.65 g of alkoxysilane-functionalized isocyanate (isocyanatopropyltrimethoxysilane), and mix at a stirring speed of 100 rpm for 15 min. Inject 0.18 g of catalyst (catalyst T-9) under a nitrogen atmosphere, and react at 45 °C and 100 rpm for 5.0 h under a nitrogen atmosphere until the isocyanate group disappears by infrared analysis to obtain a polyol-type compound with a silane-modified structure.

[0095] (2) Add 25 g of fumed silica M-5 to the polyol-type compound with a silane-modified structure prepared in step (1), and react at 65 °C and 100 rpm for 0.5 h under a nitrogen atmosphere. After cooling to 25 °C, discharge the product and store it sealed under a nitrogen atmosphere to obtain the modified polyol B.

[0096] The molar ratio of the hydroxyl group in the above vinyl polymer grafted polyether polyol to the isocyanate group in the alkoxysilane-functionalized isocyanate is 2.5:1.

[0097] The mass ratio of the above vinyl polymer grafted polyether polyol to fumed silica M-5 is 100:10.

[0098] Preparation Example 3

[0099] This preparation example provides a modified polyol, specifically modified polyol C. The preparation method of the modified polyol C includes the following steps:

[0100] (1) Add 250 g of vinyl polymer grafted polyether polyol (POP-3) to a 500 mL four-necked flask. Using a cantilever mechanical stirrer at a stirring speed of 100 rpm, introduce nitrogen for bubbling for 0.5 h, and then stop bubbling. Under a nitrogen atmosphere, use a constant temperature water bath to heat the polyether polyol to 120 °C, then stop nitrogen input, and use a diaphragm vacuum pump to reduce the pressure of the reaction system to 0.001 MPa for vacuum dehydration for 2.0 h;

[0101] Under a nitrogen atmosphere, after cooling the above vinyl polymer grafted polyether polyol system to 60 °C, 16.54 g of an alkoxysilane-functionalized isocyanate (isocyanatopropyltripropoxysilane) was injected. It was mixed for 15 min at a stirring speed of 100 rpm. 0.18 g of a catalyst (catalyst T-9) was injected under a nitrogen atmosphere, and the reaction was carried out with stirring at 70 °C and 100 rpm for 2.0 h until the isocyanate group disappeared by infrared analysis, obtaining a polyol-type compound with a silane-modified structure.

[0102] (2)2.5 g of fumed silica M-5 was added to the polyol-type compound with a silane-modified structure prepared in step (1). The reaction was carried out with stirring at 40 °C under a nitrogen atmosphere for 1.5 h. After cooling to 25 °C, it was discharged and stored sealed under a nitrogen atmosphere to obtain the modified polyol C.

[0103] The molar ratio of the hydroxyl group in the above vinyl polymer grafted polyether polyol to the isocyanate group in the alkoxysilane-functionalized isocyanate is 2:1.

[0104] The mass ratio of the above vinyl polymer grafted polyether polyol to fumed silica M-5 is 100:1.

[0105] Preparation Example 4

[0106] This preparation example provides a modified polyol, specifically modified polyol D. The difference from Preparation Example 1 is that 7.08 g of an alkoxysilane-functionalized isocyanate (isocyanatopropyltriethoxysilane) was replaced with 6.23 g of an alkoxysilane-functionalized isocyanate (isocyanatopropylmethyldiethoxysilane), while keeping the molar ratio of the hydroxyl group in the vinyl polymer grafted polyether polyol to the isocyanate group in the alkoxysilane-functionalized isocyanate at 3:1 unchanged, and other conditions were the same as in Example 1.

[0107] Preparation Example 5

[0108] This preparation example provides a modified polyol, specifically modified polyol E. The difference from Preparation Example 1 is that the vinyl polymer grafted polyether polyol (POP-2) was replaced with the same mass of polyether polyol B, and the mass of the alkoxysilane-functionalized isocyanate (isocyanatopropyltriethoxysilane) was adjusted to 12.86 g to make the molar ratio of the hydroxyl group in polyether polyol B to the isocyanate group in the alkoxysilane-functionalized isocyanate 3:1, and other conditions were the same as in Example 1.

[0109] Example 1

[0110] This example provides a polyol composition, a foaming composition, a polyurethane foam and a preparation method thereof. The polyol composition comprises the following components in parts by weight: 60 parts of polyether polyol (polyether polyol A), 35 parts of vinyl polymer grafted polyether polyol (POP-1), and 5 parts of modified polyol (modified polyol A provided in Preparation Example 1).

[0111] The foaming composition comprises the following components in parts by weight: 100 parts of the above polyol composition, 3.3 parts of foaming agent (deionized water), 1.2 parts of foam stabilizer (polyether-modified silicone, M-6698F2), 0.1 part of catalyst A-1, 0.2 part of catalyst A-33, and 0.15 part of catalyst T-9.

[0112] The polyurethane foam is prepared by the following method:

[0113] (1) Add the above polyol composition, foaming agent (deionized water), foam stabilizer (polyether-modified silicone, M-6698F2), catalyst A-1, catalyst A-33, and catalyst T-9 into a beaker, and stir with a high-speed disperser at 2000 r / min for 20 min to make them evenly mixed. Let it stand at 20°C for 4 h to obtain the foaming composition;

[0114] (2) Pour the foaming composition prepared in step (1) into a 2 L plastic measuring cup, add 39.88 parts by weight of toluene diisocyanate thereto at one time, stir vigorously with a high-speed disperser at a rotation speed of 2500 r / min for 8 s, then pour the mixture into a 200 mm×200 mm×200 mm square mold, freely foam at room temperature of 20°C for 10 min, take it out from the square mold, place it in a fume hood, and cure at room temperature of 20°C for 72 h to obtain the polyurethane foam.

[0115] Example 2

[0116] This example provides a polyol composition, a foaming composition, a polyurethane foam and a preparation method thereof, which is different from Example 1 in that the weight part of vinyl polymer grafted polyether polyol (POP-1) in the polyol composition is adjusted to 30 parts, and the weight part of modified polyol (modified polyol A provided in Preparation Example 1) is adjusted to 10 parts, and other conditions are the same as those in Example 1.

[0117] Example 3

[0118] This example provides a polyol composition, a foaming composition, a polyurethane foam and a preparation method thereof. The difference from Example 1 is that the weight fraction of vinyl polymer grafted polyether polyol (POP-1) in the polyol composition is adjusted to 25 parts, and the weight fraction of the modified polyol (modified polyol A provided in Preparation Example 1) is adjusted to 15 parts, and other conditions are the same as those in Example 1.

[0119] Example 4

[0120] This example provides a polyol composition, a foaming composition, a polyurethane foam and a preparation method thereof. The difference from Example 1 is that the weight fraction of vinyl polymer grafted polyether polyol (POP-1) in the polyol composition is adjusted to 20 parts, and the weight fraction of the modified polyol (modified polyol A provided in Preparation Example 1) is adjusted to 20 parts, and other conditions are the same as those in Example 1.

[0121] Example 5

[0122] This example provides a polyol composition, a foaming composition, a polyurethane foam and a preparation method thereof. The difference from Example 1 is that the weight fraction of vinyl polymer grafted polyether polyol (POP-1) in the polyol composition is adjusted to 15 parts, and the weight fraction of the modified polyol (modified polyol A provided in Preparation Example 1) is adjusted to 25 parts, and other conditions are the same as those in Example 1.

[0123] Example 6

[0124] This example provides a polyol composition, a foaming composition, a polyurethane foam and a preparation method thereof. The polyol composition includes the following components by weight fraction: 60 parts of polyether polyol (polyether polyol A), 15 parts of vinyl polymer grafted polyether polyol (POP-1), and 25 parts of modified polyol (modified polyol B provided in Preparation Example 2).

[0125] The foaming composition includes the following components by weight fraction: 100 parts of the above polyol composition, 2.5 parts of foaming agent (deionized water), 1 part of foam stabilizer (polyether modified silicone, M-6698F2), 0.15 part of catalyst A-1, 0.15 part of catalyst A-33, and 0.2 part of catalyst T-9.

[0126] The polyurethane foam is prepared by the following method:

[0127] (1) Add the above polyol composition, blowing agent (deionized water), foam stabilizer (polyether-modified silicone, M-6698F2), catalyst A-1, catalyst A-33, and catalyst T-9 into a beaker, and stir with a high-speed disperser at 2000 r / min for 20 min to make it evenly mixed. Let it stand at 20°C for 4 h to obtain the foaming composition;

[0128] (2) Pour the foaming composition prepared in step (1) into a 2 L plastic measuring cup, add 39.52 parts by weight of toluene diisocyanate to it at one time, stir vigorously with a high-speed disperser at a speed of 2500 r / min for 8 s, then pour the mixture into a 200 mm×200 mm×200 mm square mold, freely foam at room temperature of 20°C for 10 min, take it out of the square mold, and place it in a fume hood to cure at room temperature of 20°C for 72 h to obtain the polyurethane foam.

[0129] Example 7

[0130] This example provides a polyol composition, a foaming composition, a polyurethane foam, and a preparation method thereof. The polyol composition includes the following components in parts by weight: 60 parts of polyether polyol (polyether polyol A), 15 parts of vinyl polymer grafted polyether polyol (POP-1), and 25 parts of modified polyol (modified polyol C provided in Preparation Example 3).

[0131] The foaming composition includes the following components in parts by weight: 100 parts of the above polyol composition, 3.5 parts of blowing agent (deionized water), 1.5 parts of foam stabilizer (polyether-modified silicone, M-6698F2), 0.2 part of catalyst A-1, 0.15 part of catalyst A-33, and 0.3 part of catalyst T-9.

[0132] The polyurethane foam is prepared by the following method:

[0133] (1) Add the above polyol composition, blowing agent (deionized water), foam stabilizer (polyether-modified silicone, M-6698F2), catalyst A-1, catalyst A-33, and catalyst T-9 into a beaker, and stir with a high-speed disperser at 2000 r / min for 20 min to make it evenly mixed. Let it stand at 20°C for 4 h to obtain the foaming composition;

[0134] (2) Pour the foaming composition prepared in step (1) into a 2 L plastic measuring cup, add 40.11 parts by weight of toluene diisocyanate thereto at one time, stir vigorously with a high-speed disperser at a rotation speed of 2500 r / min for 8 s, then pour the mixture into a 200 mm × 200 mm × 200 mm square mold, freely foam at room temperature of 20°C for 10 min, take it out from the square mold, place it in a fume hood, and cure at room temperature of 20°C for 72 h to obtain the polyurethane foam.

[0135] Example 8

[0136] This example provides a polyol composition, a foaming composition, a polyurethane foam and a preparation method thereof. The difference from Example 1 is that the weight part of the vinyl polymer grafted polyether polyol (POP-1) in the polyol composition is adjusted to 10 parts, and the weight part of the modified polyol (modified polyol A provided in Preparation Example 1) is adjusted to 30 parts, and other conditions are the same as those in Example 1.

[0137] Example 9

[0138] This example provides a polyol composition, a foaming composition, a polyurethane foam and a preparation method thereof. The difference from Example 1 is that the weight part of the vinyl polymer grafted polyether polyol (POP-1) in the polyol composition is adjusted to 5 parts, and the weight part of the modified polyol (modified polyol A provided in Preparation Example 1) is adjusted to 35 parts, and other conditions are the same as those in Example 1.

[0139] Example 10

[0140] This example provides a polyol composition, a foaming composition, a polyurethane foam and a preparation method thereof. The difference from Example 1 is that the vinyl polymer grafted polyether polyol (POP-1) is not added to the polyol composition, and the weight part of the modified polyol (modified polyol A provided in Preparation Example 1) is adjusted to 40 parts, and other conditions are the same as those in Example 1.

[0141] Example 11

[0142] This example provides a polyol composition, a foaming composition, a polyurethane foam and a preparation method thereof. The difference from Example 1 is that the modified polyol (modified polyol A provided in Preparation Example 1) in the polyol composition is replaced with the same mass of modified polyol (modified polyol D provided in Preparation Example 4), and other conditions are the same as those in Example 1.

[0143] Comparative Example 1

[0144] This comparative example provides a polyol composition, a foaming composition, a polyurethane foam and a preparation method thereof. The difference from Example 1 is that the modified polyol in the polyol composition (modified polyol A provided in Preparation Example 1) is replaced with the same mass of modified polyol (modified polyol E provided in Preparation Example 5), and other conditions are the same as those in Example 1.

[0145] Comparative Example 2

[0146] This comparative example provides a polyol composition, a foaming composition, a polyurethane foam and a preparation method thereof. The difference from Example 1 is that no modified polyol (modified polyol A provided in Preparation Example 1) is added to the polyol composition, and the weight fraction of vinyl polymer grafted polyether polyol (POP-1) is adjusted to 40 parts, and other conditions are the same as those in Example 1.

[0147] Comparative Example 3

[0148] This comparative example provides a polyol composition, a foaming composition, a polyurethane foam and a preparation method thereof. The difference from Example 1 is that the modified polyol in the polyol composition (modified polyol A provided in Preparation Example 1) is replaced with the same mass of polyether polyol B (PHL-3480), and other conditions are the same as those in Example 1.

[0149] The following performance tests were carried out on the polyurethane foams provided in the above Examples 1-11 and Comparative Examples 1-3. The specific test methods are as follows:

[0150] (1) Water vapor permeability: Cut the polyurethane foam into circular sheet specimens with a diameter of 9.0 cm and a thickness of 0.5 cm; Place the discolored silica gel in a forced-air oven at 120 °C (model FD 115, manufacturer is Binder) for activation for 2.0 h, take it out and place it in a sealed container to cool to room temperature (20 °C);

[0151] Take a fabric moisture permeability cup (model YM-11, manufacturer is Shanghai Qise Trading Co., Ltd.) with an inner diameter of 6.0 cm, an outer diameter of the cup mouth of 9.0 cm, and a depth of 2.2 cm, which has a circular ring-shaped screw-fastening upper cover with an outer diameter of 9.0 cm and an inner diameter of 6.0 cm. Place 37.0 g of activated discolored silica gel in the fabric moisture permeability cup, place the circular sheet polyurethane foam specimen with a diameter of 9.0 cm and a thickness of 0.5 cm on the cup mouth of the fabric moisture permeability cup, tighten the upper cover, seal the joint between the upper cover and the cup body with waterproof tape, weigh its initial mass, denoted as WVT-M0, and then place it in a constant temperature and humidity chamber at a temperature of 38 °C and a relative humidity of 90% for water vapor permeability test. After an interval of 60 minutes, take out the polyurethane foam specimen and weigh the specimen mass and record it as WVT-M 60 ;

[0152] Calculate the water vapor transmission rate (WVT) of the polyurethane foam. The calculation formula is as follows:

[0153] Water vapor transmission rate (WVT) = [(WVT - M 60 ) - (WVT - M0)] / {60 × [π × (6.0 / 2) 2 / 10 4};

[0154] The unit of the calculated water vapor transmission rate (WVT) is g / (m 2 min);

[0155] After cutting the same polyurethane foam, take 3 circular specimens with a diameter of 9.0 cm and a thickness of 0.5 cm, and measure WVT1, WVT2, and WVT3 respectively through the above measurements. Calculate the average water vapor transmission rate (WVT) of the polyurethane foam ave as follows:

[0156] WVT ave = (WVT1 + WVT2 + WVT3) / 3;

[0157] Compare the water vapor transmission rate (WVT) values of different polyurethane foams ave to compare their water vapor permeability. The higher the water vapor transmission rate (WVT) value ave , the better the water vapor permeability is proven.

[0158] (2) Measurement of water absorption rate: Cut the polyurethane foam into cubic specimens with dimensions of 5.0 cm × 5.0 cm × 5.0 cm. Take 1 specimen, weigh its initial mass M0, and slowly place it in a flat-bottomed cylindrical container with an inner diameter of 18.0 cm and containing 5.0 cm of deionized water (the specimen floats on the water surface). Every 15 minutes, take out the specimen, blot the residual water on the surface of the specimen with absorbent paper, weigh the mass of the specimen and record it as M t , and then put the specimen back into the flat-bottomed cylindrical container with water. When the test time reaches 120 minutes (t = 120 min), weigh the mass of the specimen at this moment (M 120 ), and then stop measuring the water absorption rate.

[0159] The formula for calculating the water absorption rate (T - Wab) of the polyurethane foam at t = 120 min is as follows:

[0160] T - Wab = [(M 120 - M0) / M0] × 100%;

[0161] Cut the same polyurethane foam and take 3 cubic specimens of 5.0 cm × 5.0 cm × 5.0 cm. Measure the water absorption rate of the polyurethane foam at the moment of t = 120 min respectively to obtain (T-Wab)1, (T-Wab)2 and (T-Wab)3, and calculate the average water absorption rate (T-Wab) of the polyurethane foam at the moment of t = 120 min ave It is:

[0162] (T-Wab) ave = [(T-Wab)1 + (T-Wab)2 + (T-Wab)3] / 3;

[0163] Compare the (T-Wab) of different polyurethane foams at the same moment of t = 120 min ave value, and the water absorption rate can be compared. The higher the (T-Wab) ave value, the faster the water absorption rate.

[0164] (3) Measurement of the drying rate (water loss rate) of water: Cut the polyurethane foam into cubic specimens of 5.0 cm × 5.0 cm × 5.0 cm. Take 1 of them and weigh its initial mass M0. Slowly place it in a flat-bottomed cylindrical container with an inner diameter of 18.0 cm and containing 5.0 cm high deionized water (the specimen floats on the water surface). After 120 minutes of testing time, take out the specimen and blot the residual water on the surface of the specimen with absorbent paper, and record the mass of the specimen as M 120 , and place the specimen on a stainless steel wire mesh with a grid spacing of 2 cm and a diameter of 0.1 cm. Place the stainless steel wire mesh with the specimen in an environment with a temperature of 22.1 °C, a humidity of 32.5% (relative humidity), and a wind speed of 0.5 m / s for drying rate testing. Take out the specimen every 30 minutes and record the mass of the specimen as ML t , when the testing time reaches 120 minutes (t = 120 min), weigh the mass of the specimen at this moment (ML 120 ) and then stop measuring the drying rate.

[0165] The formula for calculating the drying rate (T-Wlo) of the polyurethane foam at the moment of t = 120 min is:

[0166] T-Wlo = [(M 120 - ML 120 ) / (M 120 - M0)] × 100%;

[0167] After cutting the same polyurethane foam, take 3 cubic specimens of 5.0 cm × 5.0 cm × 5.0 cm and conduct the above measurements respectively to obtain (T-Wlo)1, (T-Wlo)2, and (T-Wlo)3, and calculate the average drying rate (T-Wlo) of the polyurethane foam at t = 120 min. ave It is:

[0168] (T-Wlo) ave = [(T-Wlo)1 + (T-Wlo)2 + (T-Wlo)3] / 3;

[0169] Compare the (T-Wlo) values of different polyurethane foams at the same t = 120 min. ave The value can be used to compare their drying speeds. The higher the (T-Wlo) ave value, the faster the drying speed, that is, the better the rapid drying performance.

[0170] (4) Rebound performance: Refer to GB / T 6670-2008 "Determination of rebound performance of flexible cellular polymeric materials by the falling ball method" to conduct the falling ball method rebound performance test.

[0171] Cut the polyurethane foam into specimens of 10.0 cm × 10.0 cm × 5.0 cm, take 1 piece of it, and use a universal material testing machine (model 34TM-30, manufacturer Instron) for preloading: Compress it to 80% of the original thickness (4.0 cm) at a speed of 0.5 mm / s, retract the pressure fixture to the starting position. After the specimen elastically recovers to the starting height, compress it again to 80% of the original thickness (4.0 cm) at a speed of 0.5 mm / s, and retract the pressure fixture to the starting position (a total of 2 compressions). After the compressed specimen is left standing for 10 min, immediately conduct the falling ball rebound performance test.

[0172] Falling ball rebound performance test: Place the specimen on the reference surface of the visual falling ball rebound instrument, vertically fix a transparent measuring tube with a length of 600 mm and an inner diameter of 50 mm above the specimen, and confirm that there is a light contact between the tube and the specimen without causing any visible pressure. Confirm that the zero rebound position is 16 mm above the specimen surface. Place a 16.9 g steel ball (diameter 16 mm) on the release device, then release the steel ball, and record the integer value h of the maximum rebound height. The calculation method of the falling ball percentage rebound value R is:

[0173] R = (h / h max ) × 100%;

[0174] In the formula, h max is the falling ball height (600 mm).

[0175] During the falling or rebounding process of the ball, if it touches the inner wall of the pipe, the test result of this time is invalid. For each specimen, at least 3 results should be measured within 1 minute, and the median value is taken and denoted as R'. If one of the result values exceeds 20% of the median value, conduct 2 more tests and determine the median value among the 5 values.

[0176] Take 3 specimens from each polyurethane foam sample and repeat the above process for measurement respectively to obtain R'1, R'2 and R'3, and then take the median value of R'1, R'2 and R'3 as the rebound rate of the sample.

[0177] The test results are shown in Table 1 below:

[0178] Table 1

[0179]

[0180] As can be seen from the content of Table 1, the polyurethane foams provided in Examples 1 to 11 have excellent water vapor permeability, water drying speed, water absorption speed and resilience. The water vapor transmission rate is 356.4 - 631.2 g / (m 2 min), the average water absorption rate is 66.5% - 89.8%, the average drying rate is 61.4% - 88.3%, and the rebound rate is 28.6% - 44.3%.

[0181] By comparing Examples 1 to 5 and Examples 8 to 10, it can be seen that as the mass of the modified polyol in the polyol composition increases, the water vapor permeability of the prepared polyurethane foam first increases and then decreases. When the weight fraction of the modified polyol in the polyol composition is preferably 20 - 40 parts, the water vapor permeability of the prepared polyurethane foam is relatively high. When the weight fraction of the modified polyol in the polyol composition is preferably 25 - 35 parts, the performance of the prepared polyurethane foam is better.

[0182] Compared with Example 1, if the modified polyol A is replaced with the same mass of modified polyol D (Example 11), the water drying speed, resilience and water vapor permeability performance of the prepared polyurethane foam will all decrease slightly. From this, it can be seen that when the alkoxysilane-functionalized isocyanate has the structure shown in Formula 1 and R1, R2 and R3 in Formula 1 are all alkoxy groups, the performance of the prepared polyurethane foam is better.

[0183] Compared with Example 1, if the modified polyol A is replaced with the same mass of modified polyol E (Comparative Example 1), the water vapor permeability performance of the prepared polyurethane foam will decrease significantly. From this, it can be seen that when the modified polyol uses vinyl polymer-grafted polyether polyol, alkoxysilane-functionalized isocyanate and silica with active groups on the surface as raw materials, the performance of the prepared polyurethane foam is better.

[0184] Compared with Example 1, if the modified polyol is not added (Comparative Example 2), the water vapor permeability, drying rate of water, water absorption rate and resilience of the prepared polyurethane foam all decrease significantly.

[0185] Compared with Example 1, if the modified polyol is replaced with polyether polyol B (Comparative Example 3), the drying rate of water, water absorption rate and resilience of the prepared polyurethane foam all decrease to some extent, and the water vapor permeability decreases significantly. It can be seen that applying the polyol composition prepared by compounding polyether polyol and modified polyol to the preparation of polyurethane foam can improve the water vapor permeability, drying rate of water, water absorption rate and resilience of the polyurethane foam.

[0186] The applicant declares that the present invention uses the above examples to illustrate a polyol composition, a foaming composition, and their preparation methods and applications of the present invention. However, the present invention is not limited to the above examples, that is, it does not mean that the present invention must rely on the above examples to be implemented. Those skilled in the art should understand that any improvement to the present invention, equivalent substitution of each raw material of the products of the present invention, addition of auxiliary components, selection of specific methods, etc. all fall within the protection scope and disclosure scope of the present invention.

Claims

1. A polyol composition, characterized in that, The polyol composition, based on 100 parts by total weight, comprises the following components: 60 parts of polyether polyol and 5 - 40 parts of modified polyol; the raw materials for preparing the modified polyol include vinyl polymer grafted polyether polyol, alkoxysilane functionalized isocyanate, and silica with active groups on the surface; The alkoxysilane functionalized isocyanate has the structure shown in Formula 1 below: ； In Formula 1, X is selected from any one of substituted or unsubstituted C1 - C18 linear or branched alkylene, substituted or unsubstituted C3 - C18 cycloalkylene, substituted or unsubstituted C2 - C18 non - aromatic heterocycloalkylene, substituted or unsubstituted C6 - C18 arylene, and substituted or unsubstituted C3 - C18 heteroarylene; In Formula 1, R1, R2, and R3 are each independently selected from any one of substituted or unsubstituted C1 - C18 alkyl, substituted or unsubstituted C6 - C18 aryl, substituted or unsubstituted C3 - C18 cycloalkyl, and substituted or unsubstituted C1 - C18 alkoxy, and at least one of R1, R2, and R3 is selected from substituted or unsubstituted C1 - C18 alkoxy; When the above groups have substituents, the substituents include any one or at least two combinations of C1 - C10 alkyl, C6 - C12 aryl, or C4 - C10 heteroaryl; The modified polyol is prepared by the following method: (1) Mix vinyl polymer grafted polyether polyol and alkoxysilane functionalized isocyanate, and react to obtain a polyol - type compound with a silane - modified structure; (2) Mix the polyol - type compound with a silane - modified structure obtained in step (1) and silica with active groups on the surface, and react to obtain the modified polyol; In step (1), the molar ratio of the hydroxyl group in the vinyl polymer grafted polyether polyol to the isocyanate group in the alkoxysilane functionalized isocyanate is (2 - 3):1; In step (1), the mass ratio of the vinyl polymer grafted polyether polyol to the silica with active groups on the surface in step (2) is 100:(1 - 10).

2. The polyol composition according to claim 1, characterized in that, The number - average molecular weight of the vinyl polymer grafted polyether polyol is 800 - 12000 g / moL; The functionality of the vinyl polymer grafted polyether polyol is ≥2; The content of the vinyl polymer in the vinyl polymer grafted polyether polyol is 10wt% - 50wt%; The vinyl polymer in the vinyl polymer grafted polyether polyol includes acrylonitrile - styrene copolymer; The mixing in step (1) also includes mixing with a catalyst; The catalyst in step (1) includes an organotin catalyst; The organotin catalyst includes stannous octoate and / or dibutyltin dilaurate; In step (1), the mass ratio of the catalyst to the vinyl polymer grafted polyether polyol is 100:(0.04 - 0.08); The reactions in step (1) and step (2) are carried out under an inert atmosphere; In step (1), the temperature of the reaction is 45 - 70°C, and the reaction time is 2.0 - 5.0 h; The temperature of the reaction described in step (2) is 40~65 °C, and the reaction time is 0.5~1.5 h.

3. The polyol composition according to claim 1, characterized in that, The alkoxysilane-functionalized isocyanate includes any one or a combination of at least two of isocyanatopropyltrimethoxysilane, isocyanatopropyltriethoxysilane, isocyanatopropyltripropoxysilane, isocyanatopropyltributoxysilane, isocyanatomethyltrimethoxysilane, isocyanatopropylmethyldiethoxysilane, or isocyanatopropylmethyldimethoxysilane; The active groups in the silica with active groups on the surface include hydroxyl groups; The silica with active groups on the surface includes fumed silica; The polyol composition further includes vinyl polymer grafted polyether polyol; The weight parts of the vinyl polymer grafted polyether polyol in the polyol composition are 0~35 parts.

4. A foaming composition, characterized in that, The foaming composition includes the following components: the polyol composition according to any one of claims 1~3, a foaming agent, a foam stabilizer, and a catalyst.

5. The foaming composition according to claim 4, characterized in that, The foaming composition includes the following components by weight parts: 100 parts of the polyol composition according to any one of claims 1~3, 2.5~3.5 parts of the foaming agent, 1.0~1.5 parts of the foam stabilizer, and 0.3~0.8 parts of the catalyst; The foaming agent includes water; The foam stabilizer includes modified silicone oil; The catalyst in the foaming composition includes any one or a combination of at least two of stannous octoate, bis(dimethylaminoethyl)ether, or triethylenediamine.

6. A polyurethane foam, characterized in that, The raw materials for preparing the polyurethane foam include the foaming composition according to claim 4 or 5 and isocyanate.

7. The polyurethane foam according to claim 6, wherein The isocyanate includes toluene diisocyanate.

8. A method for preparing a polyurethane foam as claimed in claim 6 or 7, characterized in that, The preparation method includes the following steps: mixing the foaming composition and the isocyanate, foaming, and curing to obtain the polyurethane foam.

9. Use of a polyurethane foam according to claim 6 or 7 in clothing padding.

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