Polyol composition, foaming composition and preparation method and application thereof

Abstract

The invention provides a polyol composition, a foaming composition and a preparation method and application thereof. The polyol composition is prepared from the following components in parts by weight: 60 parts of polyether polyol and 5 to 40 parts of modified polyol, wherein the total weight part of the polyol composition is 100 parts; the modified polyol is prepared from the following raw materials: vinyl polymer grafted polyether polyol, alkoxy silane functionalized isocyanate and silicon dioxide with active groups on the surface. The polyurethane foam is prepared by using the polyol composition provided by the invention, and the prepared polyurethane foam has excellent water vapor permeability, high water drying speed, high water absorption speed and good rebound 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 800-12000 g / moL (e.g., 1200 g / moL, 2400 g / moL, 3600 g / moL, 4800 g / moL, 5000 g / moL, 6200 g / moL, 7400 g / moL, 8600 g / moL, 9800 g / moL or 11000 g / moL, etc.).

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

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

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

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

[0020] .

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

[0022] Preferably, in Formula 1, R1, R2 and R3 are each independently selected from any one of substituted or unsubstituted C1~C18 (e.g., C2, C4, C6, C8, C10, C12, C14 or C16, etc.) alkyl, substituted or unsubstituted C6~C18 (e.g., C8, C10, C12, C14 or C16, etc.) aryl, substituted or unsubstituted C3~C18 (e.g., C4, C6, C8, C10, C12, C14 or C16, etc.) cycloalkyl, and substituted or unsubstituted C1~C18 (e.g., C2, C4, C6, C8, C10, C12, C14 or C16, etc.) alkoxy, and at least one of R1, R2 and R3 is selected from substituted or unsubstituted C1~C18 alkoxy.

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

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

[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, step (1) further comprises a step of dehydrating the vinyl polymer grafted polyether polyol before the mixing.

[0028] Preferably, the molar ratio of hydroxyl groups in the vinyl polymer grafted polyether polyol to isocyanate groups in the alkoxysilane functionalized isocyanate in step (1) is (2-3):1, for example, 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 group in the polyol to the isocyanate group in the alkoxysilane-functionalized isocyanate in step (1) is preferably (2-3):1. If the molar ratio is too small, the alkoxysilane-functionalized isocyanate introduced into the modified polyol and the silica with active groups on the surface are less, resulting in relatively poor performance of the obtained polyurethane foam. If the molar ratio is too large, the obtained modified polyol itself is over-polymerized and has a high viscosity, resulting in difficulty in achieving uniform mixing with other components during the preparation of the polyurethane foam, resulting in relatively poor performance of the obtained polyurethane foam.

[0030] Preferably, the mass ratio of the vinyl polymer grafted polyether polyol in step (1) to the silicon dioxide having surface active groups in step (2) is 100:(1-10), for example, 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 silicon dioxide having active groups on the surface in step (2) is preferably 100:(1-10). If the mass ratio is too large, less silicon dioxide having active groups on the surface is introduced into the modified polyol, and the obtained polyurethane foam has poor performance. If the mass ratio is too small, the obtained modified polyol has high viscosity, and it is difficult to achieve uniform mixing with other components when preparing the polyurethane foam, which makes the operation difficult and the obtained polyurethane foam has poor performance.

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

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

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

[0035] Preferably, the mass ratio of the catalyst to the vinyl polymer grafted polyether polyol in step (1) is 100:(0.04-0.08), for example, 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 step (1) and step (2) are carried out under an inert atmosphere.

[0037] Preferably, the reaction temperature in step (1) is 45-70°C (e.g., 48°C, 51°C, 54°C, 57°C, 60°C, 63°C, 65°C or 68°C, etc.), and the reaction time is 2.0-5.0 h (e.g., 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 reaction temperature in step (2) is 40-65°C (e.g., 43°C, 46°C, 49°C, 52°C, 55°C, 58°C, 61°C or 64°C, etc.), and the reaction time is 0.5-1.5 h (e.g., 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 of isocyanatepropyltrimethoxysilane, isocyanatepropyltriethoxysilane, isocyanatepropyltripropoxysilane, isocyanatepropyltributoxysilane, isocyanatemethyltrimethoxysilane, isocyanatepropylmethyldiethoxysilane or isocyanatepropylmethyldimethoxysilane, or a combination of at least two thereof.

[0040] Preferably, the active groups in the silicon dioxide having active groups on the surface include hydroxyl groups.

[0041] Preferably, the silicon dioxide having active groups on the surface includes fumed silicon dioxide.

[0042] Preferably, the polyol composition further comprises a vinyl polymer-grafted polyether polyol.

[0043] Preferably, the weight proportion of the vinyl polymer grafted polyether polyol in the polyol composition is 0 to 35 parts (eg, 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, comprising 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 of a foaming agent (for example, 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.), 1.0-1.5 parts of a foam stabilizer (for example, 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.) and 0.3-0.8 parts of a catalyst (for example, 0.4 parts, 0.5 parts, 0.6 parts or 0.7 parts, etc.).

[0046] Preferably, the blowing agent comprises water.

[0047] Preferably, the water comprises deionized water.

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

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

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

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

[0052] Preferably, the isocyanate comprises toluene diisocyanate.

[0053] Preferably, the mass ratio of the foaming composition to the isocyanate is 1:(0.3-0.4), for example, 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 the polyurethane foam as described in the third aspect, the preparation method comprising the following steps: mixing a foaming composition and an isocyanate, foaming, and aging to obtain the polyurethane foam.

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

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

[0057] 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. The prepared polyurethane foam has excellent water vapor permeability, fast water drying speed, fast water absorption speed and good resilience. It can bring better comfort to the wearer when applied to clothing pads, sports underwear and other fields. The water vapor permeability of the polyurethane foam is 356.4~631.2g / (m 2 min), the average water absorption rate is 66.5%~89.8%, the average drying rate is 61.4%~88.3%, the rebound rate is 28.6%~44.3%, and the water vapor transmission rate is 517.8~631.2g / (m 2 min), the average water absorption rate is 79.8%~89.8%, the average drying rate is 76.8%~88.3%, and the rebound rate is 37.9%~44.3%. DETAILED DESCRIPTION

[0058] The technical solution of the present invention is further described below by specific implementation methods. It should be understood by those skilled in the art that the embodiments are only to help understand the present invention and should not be regarded as specific limitations of the present invention.

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

[0060] (1) Polyether polyols

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

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

[0063] (2) Vinyl polymer grafted polyether polyol

[0064] POP-1: Vinyl polymer grafted polyether polyol, functionality 3, number average molecular weight 4800 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 is PPL-3448;

[0065] POP-2: Vinyl polymer grafted polyether polyol, functionality 3, number average molecular weight 6000 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 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 a modified polyol A. The preparation method of the modified polyol A comprises the following steps:

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

[0087] Under a nitrogen atmosphere, the vinyl polymer grafted polyether polyol system was cooled to 60°C, and then 7.08 g of alkoxysilane functionalized isocyanate (isocyanatepropyltriethoxysilane) was injected, mixed at a stirring speed of 100 rpm for 15 min, and 0.18 g of catalyst (catalyst T-9) was injected under a nitrogen atmosphere. The reaction was stirred at 60°C and 100 rpm for 4.0 h under a nitrogen atmosphere until the isocyanate group disappeared by infrared analysis, thereby obtaining a polyol compound with a silane-modified structure.

[0088] (2) Add 5.25 g of fumed silica M-5 to the polyol compound having a silane-modified structure obtained in step (1), and stir the mixture at 60° C. and 100 rpm for 1 h under a nitrogen atmosphere. After cooling to 25° C., discharge the mixture, and store it in a sealed container under a nitrogen atmosphere to obtain the modified polyol.

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

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

[0091] Preparation Example 2

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

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

[0094] Under a nitrogen atmosphere, the vinyl polymer grafted polyether polyol system was cooled to 60°C, and then 5.65 g of alkoxysilane functionalized isocyanate (isocyanatepropyltrimethoxysilane) was injected, mixed at a stirring speed of 100 rpm for 15 min, and 0.18 g of catalyst (catalyst T-9) was injected under a nitrogen atmosphere. The reaction was stirred at 45°C and 100 rpm under a nitrogen atmosphere for 5.0 h until the isocyanate group disappeared by infrared analysis, thereby obtaining a polyol compound with a silane-modified structure.

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

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

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

[0098] Preparation Example 3

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

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

[0101] Under a nitrogen atmosphere, the vinyl polymer grafted polyether polyol system was cooled to 60°C, and then 16.54 g of alkoxysilane-functionalized isocyanate (isocyanatepropyltripropoxysilane) was injected. The mixture was mixed at a stirring speed of 100 rpm for 15 min. Under a nitrogen atmosphere, 0.18 g of catalyst (catalyst T-9) was injected, and the mixture was stirred at 70°C and 100 rpm for 2.0 h under a nitrogen atmosphere until the isocyanate group disappeared by infrared analysis, thereby obtaining a polyol compound with a silane-modified structure.

[0102] (2) Add 2.5 g of fumed silica M-5 to the polyol compound having a silane-modified structure obtained in step (1), and stir the mixture at 40° C. and 100 rpm for 1.5 h under a nitrogen atmosphere. After cooling to 25° C., discharge the mixture and store it in a sealed container under a nitrogen atmosphere to obtain the modified polyol C.

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

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

[0105] Preparation Example 4

[0106] This preparation example provides a modified polyol, specifically modified polyol D, which differs from Preparation Example 1 in that 7.08 g of alkoxysilane-functionalized isocyanate (isocyanatepropyltriethoxysilane) is replaced with 6.23 g of alkoxysilane-functionalized isocyanate (isocyanatepropylmethyldiethoxysilane), and the molar ratio of the hydroxyl group in the vinyl polymer-grafted polyether polyol and the isocyanate group in the alkoxysilane-functionalized isocyanate is kept unchanged at 3:1, and other conditions are the same as in Example 1.

[0107] Preparation Example 5

[0108] This preparation example provides a modified polyol, specifically modified polyol E, which differs from preparation example 1 in that the vinyl polymer grafted polyether polyol (POP-2) is replaced with a polyether polyol B of the same mass, the mass of the alkoxysilane functionalized isocyanate (isocyanatepropyltriethoxysilane) is adjusted to 12.86 g, and the molar ratio of the hydroxyl group in the polyether polyol B to the isocyanate group in the alkoxysilane functionalized isocyanate is 3:1. Other conditions are the same as those in Example 1.

[0109] Example 1

[0110] This embodiment 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 a polyether polyol (polyether polyol A), 35 parts of a vinyl polymer grafted polyether polyol (POP-1) and 5 parts of a modified polyol (modified polyol A provided in Preparation Example 1).

[0111] The foaming composition includes the following components by weight: 100 parts of the above-mentioned polyol composition, 3.3 parts of a foaming agent (deionized water), 1.2 parts of a foam stabilizer (polyether-modified silicone, M-6698F2), 0.1 parts of a catalyst A-1, 0.2 parts of a catalyst A-33 and 0.15 parts of a 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, stir at 2000 r / min for 20 min to mix them evenly, and let stand at 20° C. for 4 h to obtain the foaming composition;

[0114] (2) The foaming composition obtained in step (1) was poured into a 2L plastic measuring cup, 39.88 parts by weight of toluene diisocyanate was added thereto at one time, and the mixture was vigorously stirred at a speed of 2500 r / min for 8 s using a high-speed disperser. The mixture was poured into a 200 mm×200 mm×200 mm square mold, and freely foamed at room temperature of 20°C for 10 min. The mixture was taken out from the square mold, placed in a fume hood, and aged at room temperature of 20°C for 72 h to obtain the polyurethane foam.

[0115] Example 2

[0116] This embodiment provides a polyol composition, a foaming composition, a polyurethane foam and a preparation method thereof. The difference between this embodiment and Example 1 is that the weight fraction of the vinyl polymer grafted polyether polyol (POP-1) in the polyol composition is adjusted to 30 parts, the weight fraction of the modified polyol (modified polyol A provided in Preparation Example 1) is adjusted to 10 parts, and other conditions are the same as in Example 1.

[0117] Example 3

[0118] This embodiment provides a polyol composition, a foaming composition, a polyurethane foam and a preparation method thereof. The difference between this embodiment and Example 1 is that the weight fraction of the vinyl polymer grafted polyether polyol (POP-1) in the polyol composition is adjusted to 25 parts, 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 in Example 1.

[0119] Example 4

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

[0121] Example 5

[0122] This embodiment provides a polyol composition, a foaming composition, a polyurethane foam and a preparation method thereof. The difference between this embodiment and Example 1 is that the weight fraction of the vinyl polymer grafted polyether polyol (POP-1) in the polyol composition is adjusted to 15 parts, 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 in Example 1.

[0123] Example 6

[0124] This embodiment 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 a polyether polyol (polyether polyol A), 15 parts of a vinyl polymer grafted polyether polyol (POP-1) and 25 parts of a modified polyol (modified polyol B provided in Preparation Example 2).

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

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

[0127] (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, stir at 2000 r / min for 20 min to mix them evenly, and let stand at 20° C. for 4 h to obtain the foaming composition;

[0128] (2) The foaming composition obtained in step (1) was poured into a 2L plastic measuring cup, 39.52 parts by weight of toluene diisocyanate was added thereto at one time, and the mixture was vigorously stirred at a speed of 2500 r / min for 8 s using a high-speed disperser. The mixture was poured into a 200 mm×200 mm×200 mm square mold, and freely foamed at room temperature of 20°C for 10 min. The mixture was taken out from the square mold, placed in a fume hood, and aged at room temperature of 20°C for 72 h to obtain the polyurethane foam.

[0129] Example 7

[0130] This embodiment 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 a polyether polyol (polyether polyol A), 15 parts of a vinyl polymer grafted polyether polyol (POP-1) and 25 parts of a modified polyol (modified polyol C provided in Preparation Example 3).

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

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

[0133] (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, stir at 2000 r / min for 20 min to mix them evenly, and let stand at 20° C. for 4 h to obtain the foaming composition;

[0134] (2) The foaming composition obtained in step (1) was poured into a 2L plastic measuring cup, 40.11 parts by weight of toluene diisocyanate was added thereto at one time, and the mixture was vigorously stirred at a speed of 2500 r / min for 8 s using a high-speed disperser. The mixture was poured into a 200 mm×200 mm×200 mm square mold, and freely foamed at room temperature of 20°C for 10 min. The mixture was taken out from the square mold, placed in a fume hood, and aged at room temperature of 20°C for 72 h to obtain the polyurethane foam.

[0135] Example 8

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

[0137] Example 9

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

[0139] Example 10

[0140] This embodiment provides a polyol composition, a foaming composition, a polyurethane foam and a preparation method thereof. The difference between this embodiment and Example 1 is that no vinyl polymer grafted polyether polyol (POP-1) is added to the polyol composition, the weight proportion 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] Embodiment 11

[0142] This embodiment provides a polyol composition, a foaming composition, a polyurethane foam and a preparation method thereof, which differs from Example 1 in that the modified polyol in the polyol composition (modified polyol A provided in Preparation Example 1) is replaced with a modified polyol of the same mass (modified polyol D provided in Preparation Example 4), and other conditions are the same as 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, which differs from Example 1 in that the modified polyol in the polyol composition (modified polyol A provided in Preparation Example 1) is replaced with a modified polyol of the same mass (modified polyol E provided in Preparation Example 5), and other conditions are the same as 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, which differs from Example 1 in that no modified polyol (modified polyol A provided in Preparation Example 1) is added to the polyol composition, the weight fraction of the 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, which differs from Example 1 in that the modified polyol in the polyol composition (modified polyol A provided in Preparation Example 1) is replaced with polyether polyol B (PHL-3480) of the same mass, and other conditions are the same as in Example 1.

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

[0150] (1) Water vapor permeability: The polyurethane foam was cut into disc-shaped specimens with a diameter of 9.0 cm and a thickness of 0.5 cm. The color-changing silica gel was placed in a 120°C forced air oven (model FD 115, manufactured by Binder) for activation for 2.0 h, then taken out and placed in a sealed container to cool to room temperature (20°C).

[0151] Take a fabric breathable cup (model YM-11, manufactured by Shanghai Qi Se Trading Co., Ltd.) with an inner diameter of 6.0 cm, an outer diameter of 9.0 cm at the cup mouth, and a depth of 2.2 cm. It has a circular screw-fastened cover with an outer diameter of 9.0 cm and an inner diameter of 6.0 cm. Place 37.0 g of activated color-changing silica gel in the fabric breathable cup, place a circular polyurethane foam sample with a diameter of 9.0 cm and a thickness of 0.5 cm at the mouth of the fabric breathable cup, tighten the cover, seal the joint between the cover and the cup body with waterproof tape, weigh its initial mass, record it 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% to conduct a water vapor permeability test. Take out the polyurethane foam sample after an interval of 60 minutes, weigh the sample mass and record it as WVT-M0. 60 ;

[0152] Calculate the water vapor transmission rate WVT of polyurethane foam using the following formula:

[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] The same polyurethane foam was cut into three disc-shaped samples with a diameter of 9.0 cm and a thickness of 0.5 cm. The above measurements were performed to obtain WVT1, WVT2 and WVT3, and the average water vapor transmission rate WVT of the polyurethane foam was calculated. ave for:

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

[0157] Comparison of water vapor transmission rates (WVT) of different polyurethane foams ave The water vapor transmission rate WVT can be compared. ave The higher the value, the better the water vapor permeability.

[0158] (2) Determination of water absorption rate: Cut the polyurethane foam into cubic samples of 5.0 cm × 5.0 cm × 5.0 cm, take one of them, weigh its initial mass M0, and slowly place it in a flat-bottomed cylindrical container with an inner diameter of 18.0 cm and a height of 5.0 cm filled with deionized water (the sample floats on the water surface). Every 15 minutes, take out the sample and use absorbent paper to absorb the residual water on the surface of the sample. Weigh the sample mass and record it as M. t , put the sample back into the cylindrical container with a flat bottom, and weigh the sample mass (M) at the time when the test time reaches 120 minutes (t=120 min). 120 ), stop measuring the water absorption rate.

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

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

[0161] After cutting the same polyurethane foam, three cubic samples of 5.0 cm × 5.0 cm × 5.0 cm were taken and the water absorption rate of the polyurethane foam at t = 120 min was measured respectively to obtain (T-Wab) 1, (T-Wab) 2 and (T-Wab) 3. The average water absorption rate (T-Wab) of the polyurethane foam at t = 120 min was calculated. ave for:

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

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

[0164] (3) Determination of drying speed (water loss rate) for water: Cut the polyurethane foam into cubic specimens of 5.0 cm × 5.0 cm × 5.0 cm. Take one 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 a height of 5.0 cm filled with deionized water (the specimen floats on the water surface). After the test time reaches 120 minutes, take out the specimen and use absorbent paper to absorb the residual water on the surface of the specimen. Weigh the mass of the specimen and record it as M. 120 , place the sample on a stainless steel grid with a grid spacing of 2 cm and a diameter of 0.1 cm. Place the stainless steel grid with the sample 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 to test the drying speed. Take out the sample every 30 minutes, weigh the sample, and record the mass as ML t When the test time reaches 120 minutes (t=120 min), weigh the sample mass (ML 120 ), stop the drying speed measurement.

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

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

[0167] After cutting the same polyurethane foam, three cubic samples of 5.0 cm × 5.0 cm × 5.0 cm were taken and the above measurements were performed respectively to obtain (T-Wlo) 1, (T-Wlo) 2 and (T-Wlo) 3. The average drying rate (T-Wlo) of the polyurethane foam at t = 120 min was calculated. ave for:

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

[0169] Comparison of different polyurethane foams at the same time t = 120 min (T-Wlo) ave The drying speed can be compared by using the value (T-Wlo). ave The higher the value, the faster the drying speed, that is, the better the quick-drying performance.

[0170] (4) Rebound performance: refer to GB / T 6670-2008 "Determination of rebound performance of soft foam polymer materials by falling ball method" for the rebound performance test.

[0171] The polyurethane foam was cut into 10.0cm×10.0cm×5.0cm specimens, and one of them was taken for pre-compression using a universal material testing machine (model 34TM-30, manufacturer: Instron): it was compressed to 80% of the original thickness (4.0cm) at a speed of 0.5mm / s, and the pressure fixture was withdrawn to the starting position. After the specimen elastically recovered to the starting height, it was compressed again at a speed of 0.5mm / s to 80% of the original thickness (4.0cm), and the pressure fixture was withdrawn to the starting position (a total of 2 compressions). After the compressed specimen was left to stand for 10 minutes, a falling ball rebound performance test was immediately performed.

[0172] Drop ball rebound performance test: Place the sample on the reference plane of the visual drop ball rebound instrument, and fix a transparent measuring tube with a length of 600 mm and an inner diameter of 50 mm vertically above the sample. Confirm that there is light contact between the tube and the sample, but no visible pressure is caused. Confirm that the zero rebound position is 16 mm above the sample 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 of the maximum rebound height h. The calculation method of the drop ball percentage rebound value R is:

[0173] R = (h / h max )×100%;

[0174] Where h max is the ball drop height (600mm).

[0175] If the ball hits the inner wall of the tube during the falling or rebounding process, the test result will be invalid. Each sample should be measured at least 3 times within 1 minute, and the median value should be taken and recorded as R'. If one of the results exceeds 20% of the median value, test it 2 more times to determine the median value among the 5 values.

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

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

[0178] Table 1

[0179]

[0180] From the contents of Table 1, it can be seen that the polyurethane foams provided by Examples 1 to 11 have excellent water vapor permeability, water drying speed, water absorption speed and resilience, and the water vapor permeability is 356.4 to 631.2 g / (m 2 min), the average water absorption rate was 66.5%~89.8%, the average drying rate was 61.4%~88.3%, and the rebound rate was 28.6%~44.3%.

[0181] By comparing Examples 1 to 5 with 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 obtained polyurethane foam first increases and then decreases. When the weight portion of the modified polyol in the polyol composition is preferably 20 to 40 parts, the water vapor permeability of the obtained polyurethane foam is relatively high. When the weight portion of the modified polyol in the polyol composition is preferably 25 to 35 parts, the performance of the obtained polyurethane foam is better.

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

[0183] Compared with Example 1, if the modified polyol A is replaced with the modified polyol E of the same mass (Comparative Example 1), the water vapor permeability of the obtained polyurethane foam is significantly reduced. It can be seen that the performance of the polyurethane foam obtained by using the modified polyol as raw materials of vinyl polymer grafted polyether polyol, alkoxysilane functionalized isocyanate and silica with active groups on the surface is better.

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

[0185] Compared with Example 1, if the modified polyol is replaced with polyether polyol B (Comparative Example 3), the drying speed, water absorption speed and resilience of the obtained polyurethane foam are all reduced, and the water vapor permeability is significantly reduced. It can be seen that the application of the polyol composition compounded with polyether polyol and modified polyol in the preparation of polyurethane foam can improve the water vapor permeability, drying speed, water absorption speed and resilience of the polyurethane foam.

[0186] The applicant declares that the present invention uses the above-mentioned embodiments to illustrate a polyol composition, a foaming composition, and a preparation method and application thereof, but the present invention is not limited to the above-mentioned embodiments, that is, it does not mean that the present invention must rely on the above-mentioned embodiments to be implemented. Those skilled in the art should understand that any improvement of the present invention, equivalent replacement of various raw materials of the product 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 comprises the following components based on 100 parts by total weight: 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 silicon dioxide with active groups on the surface; The alkoxysilane functionalized isocyanate has a structure as shown in Formula 1: ； In Formula 1, X is selected from any one of a substituted or unsubstituted C1-C18 straight or branched alkylene group, a substituted or unsubstituted C3-C18 cycloalkylene group, a substituted or unsubstituted C2-C18 non-aromatic heterocyclylene group, a substituted or unsubstituted C6-C18 arylene group, and a substituted or unsubstituted C3-C18 heteroarylene group; 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 a combination of at least two of C1-C10 alkyl, C6-C12 aryl or C4-C10 heteroaryl.

2. The polyol composition according to claim 1, characterized in that The modified polyol is prepared by the following method: (1) mixing a vinyl polymer grafted polyether polyol and an alkoxysilane functionalized isocyanate, and reacting them to obtain a polyol type compound having a silane modified structure; (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.

3. The polyol composition according to claim 2, 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% to 50wt%; The vinyl polymer in the vinyl polymer grafted polyether polyol comprises an acrylonitrile-styrene copolymer; The molar ratio of the hydroxyl group in the vinyl polymer grafted polyether polyol to the isocyanate group in the alkoxysilane functionalized isocyanate in step (1) is (2-3):1; The mass ratio of the vinyl polymer grafted polyether polyol in step (1) to the silicon dioxide having active groups on the surface in step (2) is 100:(1-10); The mixing in step (1) further includes adding a catalyst for mixing; The catalyst in step (1) comprises an organotin catalyst; The organotin catalyst includes stannous octoate and / or dibutyltin dilaurate; The mass ratio of the catalyst to the vinyl polymer grafted polyether polyol in step (1) is 100: (0.04-0.08); The reactions in step (1) and step (2) are carried out under an inert atmosphere; The reaction temperature in step (1) is 45-70°C and the reaction time is 2.0-5.0 h; The reaction temperature in step (2) is 40-65° C., and the reaction time is 0.5-1.5 h.

4. The polyol composition according to claim 2, characterized in that The alkoxysilane functionalized isocyanate includes any one or a combination of at least two of isocyanatepropyltrimethoxysilane, isocyanatepropyltriethoxysilane, isocyanatepropyltripropoxysilane, isocyanatepropyltributoxysilane, isocyanatemethyltrimethoxysilane, isocyanatepropylmethyldiethoxysilane or isocyanatepropylmethyldimethoxysilane; The active groups in the silicon dioxide having active groups on the surface include hydroxyl groups; The silicon dioxide having active groups on the surface includes fumed silicon dioxide; The polyol composition also includes a vinyl polymer grafted polyether polyol; The weight proportion of the vinyl polymer grafted polyether polyol in the polyol composition is 0 to 35 parts.

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

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

7. A polyurethane foam, characterized in that The raw materials for preparing the polyurethane foam include the foaming composition as claimed in claim 5 or 6 and isocyanate.

8. The polyurethane foam according to claim 7, characterized in that The isocyanate includes toluene diisocyanate.

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

10. Use of the polyurethane foam according to claim 7 or 8 in clothing padding.

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