thing

Abstract

To provide a polyurethane foam composition which has good moisture absorption and release properties and low swelling, and is suitable for use in cushions for bedding such as mattresses, and for clothing pads such as shoulder pads and bra pads. [Solution] In a polyurethane foam composition containing a polyol, a catalyst, a blowing agent, an additive, and a polyisocyanate, the polyol is a polyether polyol, the ethylene oxide content of the entire polyol is 0 to 11%, and carboxymethyl cellulose is contained as an additive in an amount of 6 to 40 parts by weight per 100 parts by weight of the polyol.

Description

[Technical Field]

[0001] The present invention provides Goods Regarding. [Background technology]

[0002] Polyurethane foams are flexible and have cushioning properties, and are therefore used as cushioning materials in bedding, clothing, furniture, vehicle interior materials, and the like. Furthermore, for bedding cushions such as mattresses and clothing pads such as shoulder pads and bra pads, in addition to flexibility and cushioning properties, high moisture absorption for a comfortable feel, high moisture release properties for drying when not in use or after washing, and low swelling when washing are required.

[0003] As a method for imparting moisture absorption and release properties, there is a method of using a polyether polyol having an ethylene oxide content of 50 to 90% as the polyol of the polyurethane foam (Patent Document 1). There is also a method of using, as polyols, a polyether polyol having an ethylene oxide content of 30% or more and a polymer polyol having an ethylene oxide content of 2 to 30% in combination (Patent Document 2). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2008-115256 [Patent Document 2] Japanese Patent Application Publication No. 2018-2979 Summary of the Invention [Problem to be solved by the invention]

[0005] However, polyether polyols with an ethylene oxide content of 50 to 90% are highly hydrophilic and swell easily when absorbed with water, which can cause the problem of deformation due to swelling. Furthermore, in a method of using a polyether polyol having an ethylene oxide content of 30% or more in combination with a polymer polyol having an ethylene oxide content of 2 to 30%, although the swelling property has been improved compared to the past, further reduction in swelling property is required.

[0006] The present invention has been made in view of the above-mentioned points, and an object of the present invention is to provide a polyurethane foam composition and a method for producing a polyurethane foam which can produce a polyurethane foam with good moisture absorption and release properties and low swelling. [Means for solving the problem]

[0007] First aspect of the invention The polyurethane foam composition comprises a polyol, a catalyst, a blowing agent, an additive, and a polyisocyanate, wherein the polyol is a polyether polyol, the ethylene oxide content of the entire polyol is 0 to 11%, and the additive comprises 6 to 40 parts by weight of carboxymethyl cellulose per 100 parts by weight of the polyol.

[0008] The second aspect of the invention is the same as the first aspect of the invention. The polyol is a single polyol, and the ethylene oxide content of the polyol is 0 to 11%.

[0009] The third aspect of the invention is the same as the first aspect of the invention. The polyol is composed of a plurality of polyols, and each polyol has an ethylene oxide content of 0 to 15%.

[0010] Fourth aspect of the invention The present invention relates to a method for producing a polyurethane foam using a polyurethane foam composition containing a polyol, a catalyst, a blowing agent, an additive, and a polyisocyanate, characterized in that the polyol is a polyether polyol, the ethylene oxide content of the entire polyol is 0 to 11%, and the additive contains 6 to 40 parts by weight of carboxymethyl cellulose per 100 parts by weight of the polyol.

[0011] The fifth aspect of the invention is the fourth aspect of the invention. The polyol is a single polyol, and the ethylene oxide content of the polyol is 0 to 11%.

[0012] The sixth aspect of the invention is the fourth aspect of the invention. The polyol is composed of a plurality of polyols, and each polyol has an ethylene oxide content of 0 to 15%. [Effects of the Invention]

[0013] In the polyurethane foam composition and polyurethane foam manufacturing method of the present invention, the polyol is made of a polyether polyol, the ethylene oxide content of the entire polyol is 0 to 11%, and 6 to 40 parts by weight of carboxymethyl cellulose is contained as an additive per 100 parts by weight of the polyol, thereby making it possible to obtain a polyurethane foam with good moisture absorption and release properties and low swelling. [Brief explanation of the drawings]

[0014] [Figure 1] 1 is a table showing the results of blending and moisture absorption properties of Examples and Comparative Examples. DETAILED DESCRIPTION OF THE INVENTION

[0015] DETAILED DESCRIPTION OF THE INVENTION The polyurethane foam composition of the present invention comprises a polyol, a catalyst, a blowing agent, an additive, and a polyisocyanate.

[0016] As the polyol, a polyether polyol is used. As the ethylene oxide content (EO content) of the polyether polyol increases, the swelling of the polyurethane foam due to water absorption increases, resulting in poor washability. Therefore, polyether polyols with an ethylene oxide content of 0 to 15% are preferred. The ethylene oxide content (EO content) is the content of ethylene oxide units when the total amount of alkylene oxide units is taken as 100% by weight.

[0017] As the ethylene oxide content of the entire polyol increases, the polyurethane foam's swelling due to water absorption increases, resulting in poor washability. Therefore, the (total) ethylene oxide content of the entire polyol is preferably 0 to 11%, and more preferably 0 to 8%. The (total) ethylene oxide content of the entire polyol is calculated by multiplying the ethylene oxide content of each polyol by the total amount of polyol. For example, if 40 parts by weight of polyol X with an ethylene oxide content of 5% and 60 parts by weight of polyol Y with an ethylene oxide content of 10% are used as polyols, the ethylene oxide content of the entire polyol is (5 x 40 + 10 x 60) / (40 + 60) = 8%.

[0018] When the polyol is composed of a single polyether polyol, a polyether polyol having an ethylene oxide content of 0 to 11%, more preferably 0 to 8%, is used. When multiple polyols are used, the amount of each polyether polyol, each having an ethylene oxide content of 0 to 15%, is determined so that the (total) ethylene oxide content of the entire polyol is 0 to 11%, more preferably 0 to 8%.

[0019] The polyether polyol used preferably has an average functionality of 2 to 5, more preferably 2 to 4. If the average functionality of the polyether polyol is lower than 2, the crosslinking reaction is less likely to occur, foaming properties tend to be poor, and the resulting polyurethane foam will be poor in distortion characteristics, etc. On the other hand, if the average functionality of the polyether polyol is too high, the crosslinking reaction will become more extensive, making the resulting polyurethane foam more likely to shrink after foaming, making it difficult to obtain a good polyurethane foam. The polyether polyol used preferably has a number average molecular weight of 2000 to 7000 and a hydroxyl value of 20 to 80 mgKOH / g.

[0020] The catalyst promotes the urethane reaction between polyol and isocyanate, and examples of the catalyst include amine catalysts and metal catalysts used for polyurethane foams. Specific examples of the amine catalyst include N,N-dimethylcyclohexylamine, N,N-dimethylbenzylamine, N,N-dimethylaminoethanol, N,N',N'-trimethylaminoethylpiperazine, and triethylenediamine. Examples of the metal catalyst include tin catalysts such as stannous octoate and dibutyltin dilaurate, phenylmercury propionate, and lead octenate. The amount of catalyst is approximately 0.1 to 1.0 parts by weight per 100 parts by weight of polyol.

[0021] Examples of the blowing agent include water, hydrocarbons, halogenated compounds, etc., and one or more of these may be used. Examples of the hydrocarbon include cyclopentane, isopentane, and normal pentane. Examples of the halogenated compounds include methylene chloride, trichlorofluoromethane, dichlorodifluoromethane, nonafluorobutyl methyl ether, nonafluorobutyl ethyl ether, pentafluoroethyl methyl ether, and heptafluoroisopropyl methyl ether. Among these, water is particularly suitable as the blowing agent. The amount of the blowing agent is preferably about 2.0 to 5.0 parts by weight per 100 parts by weight of the polyol.

[0022] The present invention includes carboxymethyl cellulose as an additive. Carboxymethyl cellulose (CMC) is a cellulose derivative in which some of the hydroxyl groups of cellulose are substituted with carboxymethyl groups. Carboxymethyl cellulose may be low-substituted with a degree of etherification (mol / C6) of 0.2 to 0.6, or high-substituted with a degree of etherification exceeding 0.6; either can be used. The degree of etherification refers to the degree of substitution of carboxymethyl groups for hydroxyl groups present in the anhydroglucose unit of cellulose. Low-substituted carboxymethyl cellulose with a degree of etherification of 0.6 or less is poorly soluble or insoluble in water. On the other hand, highly substituted carboxymethyl cellulose with a degree of etherification exceeding 0.6 has the property of being soluble in water. In addition, carboxymethyl cellulose salts, such as sodium salts, potassium salts, and ammonium salts, can also be used as the carboxymethyl cellulose.

[0023] The amount of carboxymethyl cellulose is preferably 6 to 40 parts by weight, more preferably 6 to 30 parts by weight, per 100 parts by weight of polyol. If the amount of carboxymethyl cellulose is too small, moisture absorption will decrease. On the other hand, if the amount of carboxymethyl cellulose is too large, moisture release will decrease.

[0024] Carboxymethyl cellulose and cellulose may also be used in combination. The amount of cellulose is 0 to 20 parts by weight, more preferably 0 to 15 parts by weight, per 100 parts by weight of polyol. Cellulose is less hygroscopic than carboxymethyl cellulose, but has slightly better moisture release properties. Therefore, when improved moisture release properties are particularly important, it is preferable to use carboxymethyl cellulose and cellulose in combination.

[0025] Other additives include foam stabilizers, flame retardants, colorants, ultraviolet absorbers, etc. The foam stabilizers may be any foam stabilizers used in polyurethane foams, including silicone foam stabilizers, fluorine-containing compound foam stabilizers, and known surfactants. The amount of foam stabilizer added is preferably about 0.4 to 1.5 parts by weight per 100 parts by weight of polyol.

[0026] The polyisocyanate is not particularly limited as long as it is a compound having two or more isocyanate groups, and those for polyurethane foams can be used, and one type may be used alone or two or more types may be used in combination. Examples of the polyisocyanate include aromatic, aliphatic, and alicyclic isocyanate compounds, and modified products thereof.

[0027] Examples of aromatic isocyanate compounds include diphenylmethane diisocyanate (MDI), crude diphenylmethane diisocyanate, tolylene diisocyanate (TDI), naphthalene diisocyanate (NDI), p-phenylene diisocyanate (PPDI), xylene diisocyanate (XDI), tetramethyl xylene diisocyanate (TMXDI), and tolidine isocyanate (TODI). Examples of aliphatic isocyanate compounds include hexamethylene diisocyanate (HDI), lysine diisocyanate (LDI), and lysine triisocyanate (LTI). Examples of alicyclic isocyanate compounds include isophorone diisocyanate (IPDI), cyclohexyl diisocyanate (CHDI), hydrogenated XDI (H6XDI), and hydrogenated MDI (H 12 Examples of modified isocyanate compounds include urethane-modified isocyanate compounds, dimers, trimers, carbodiimide-modified isocyanate compounds, allophanate-modified isocyanate compounds, biuret-modified isocyanate compounds, urea-modified isocyanurate-modified isocyanate compounds, oxazolidone-modified isocyanate compounds, and isocyanate-terminated prepolymers. From the viewpoint of environmental regulations, MDI-based isocyanates and modified isocyanates thereof are more preferred.

[0028] The amount of polyisocyanate blended is preferably an amount that results in an isocyanate index of 90 to 110. If the isocyanate index is less than 90, the distortion (heat resistance and moist heat resistance) of the polyurethane foam will deteriorate, while if it exceeds 110, the polyurethane foam will become too hard and will no longer feel soft. The isocyanate index is a value that indicates, as a percentage, the equivalent ratio of isocyanate groups in polyisocyanate to the total active hydrogen groups in the polyurethane foam raw materials (e.g., hydroxyl groups in polyols, active hydrogen groups such as water used as a blowing agent), and is an index used in the polyurethane foam field.

[0029] Polyurethane foam can be produced by stirring and mixing the polyurethane foam composition (polyurethane foam raw material) containing a polyether polyol having an ethylene oxide content of 0 to 11%, a catalyst, a blowing agent, carboxymethyl cellulose, and a polyisocyanate, followed by reaction and foaming. The foaming method is preferably the well-known slab foaming method. Slab foaming is a method in which the mixed polyurethane foam composition is discharged onto a belt conveyor and foamed at atmospheric pressure and room temperature. The polyurethane foam is cut into shapes and dimensions appropriate for the type of bedding. For example, in the case of a bed cushion, it is cut into a plate-like body of a predetermined thickness, and in the case of a pillow cushion, it is cut into a predetermined pillow shape.

[0030] The preferred ranges for the density, moisture absorption rate, moisture release rate, swelling rate and washability of the polyurethane foam obtained by the production method of the present invention are shown below.

[0031] If the density is too low, the cushioning properties of the polyurethane foam will be lost, whereas if it is too high, the polyurethane foam will become hard, losing its cushioning properties and becoming heavy. Therefore, the density should be between 20 and 80 kg / m. 3 is preferable, and more preferably 20 to 60 kg / m 3 The density is measured in accordance with the method based on JIS K7222.

[0032] The higher the moisture absorption rate, the easier it is to absorb moisture. For polyurethane foams used as bedding cushions or clothing pads, comfort during use is required, so a moisture absorption rate of 4% or more is preferable, and more preferably 6 to 12%.

[0033] The moisture absorption rate is measured as follows. The weight of a polyurethane foam test piece (100mm x 100mm x 50mm) is measured, and the measured value is the weight before moisture absorption. Next, the polyurethane foam test piece is left for 3 hours under conditions of a temperature of 50°C and a humidity of 95% RH, after which the weight of the polyurethane foam test piece is measured, and the measured value is the weight after moisture absorption. The moisture absorption rate (%) is calculated using the weight before moisture absorption and the weight after moisture absorption using the following formula. Moisture absorption rate (%) = {(weight after moisture absorption - weight before moisture absorption) / weight before moisture absorption} x 100

[0034] The higher the moisture release rate, the easier it is to dry. For polyurethane foams used as bedding cushions or clothing pads, drying properties are required when not in use or after washing, so a moisture release rate of 50% or more is preferred, and more preferably 70 to 100%.

[0035] The method for measuring the moisture release rate is as follows. The polyurethane foam test piece whose weight after moisture absorption was measured in the moisture absorption rate measurement is left for 1 hour under conditions of a temperature of 25°C and a humidity of 50%RH, and then its weight is measured, and this measured value is the weight after moisture release. The moisture release rate (%) is calculated using the weight before moisture absorption, the weight after moisture absorption, and the weight after moisture release using the following formula. Moisture release rate (%) = {(weight after moisture absorption - weight after moisture release) / (weight after moisture absorption - weight before moisture absorption)} x 100

[0036] The lower the swelling ratio, the less likely it is to swell with water. For polyurethane foams used as bedding cushions or clothing pads, the swelling ratio is preferably 115% or less, more preferably 100 to 105%, to prevent deformation or damage during washing.

[0037] The swelling ratio is measured as follows: The length of one specified side of a polyurethane foam test piece (10 mm x 50 mm x 50 mm) is measured, and this measurement is the length before immersion. The polyurethane foam test piece is immersed in water and gently rubbed to allow water to penetrate into the interior of the polyurethane foam test piece, and left immersed in water for 24 hours. The polyurethane foam test piece is then removed from the water, and the length of one specified side of the polyurethane foam test piece with water permeating into its interior is measured, and this measurement is the length after immersion. The swelling ratio (%) is calculated using the length before immersion and the length after immersion using the following formula. Swelling rate (%) = (length after immersion / length before immersion) x 100

[0038] Furthermore, the polyurethane foam obtained by the manufacturing method of the present invention has good washability. The method for assessing washability is as follows: a polyurethane foam test piece (10 mm x 50 mm x 50 mm) is immersed in wash water containing 50 times the standard amount of laundry detergent, rubbed three times in that state, and then the container is covered with a lid while still immersed in the wash water and left in a drying oven at 50°C for 24 hours. The polyurethane foam test piece is then removed from the wash water, rubbed and washed 10 times with tap water, rinsed, and then dried in a drying oven at 100°C for 8 hours. After four cycles, each consisting of washing using wash water and drying, the polyurethane foam test piece is evaluated for deformation and embrittlement (powdering). The absence of either deformation or embrittlement (powdering) indicates good washability, while the presence of either deformation or embrittlement (powdering) indicates poor washability.

[0039] The presence or absence of deformation during washing was judged by visually observing the surface of the polyurethane foam test piece after the four cycles. If there was neither swelling nor wrinkles, it was judged as no deformation, and if there was either swelling or wrinkles, it was judged as having deformation. The presence or absence of embrittlement (powdering) in the washability was judged by visually observing the surface of the polyurethane foam test piece before washing and after the four cycles, or by touching the surface with the hand. If even a part of the test piece was found to be powdery, it was considered to be embrittlement (powdering). If no powder was found, it was considered to be no embrittlement (powdering). [Example]

[0040] The polyurethane foams of each Example and Comparative Example were produced by mixing and stirring the following components with polyurethane foam compositions prepared according to the formulations of each Example and Comparative Example shown in Figure 1. Note that "Total EO%" ​​in Figure 1 refers to the (total) ethylene oxide content of all the polyols used.

[0041] Polyol-A: Polyether polyol, functionality 3, molecular weight 3000, hydroxyl value 56 mg KOH / g, ethylene oxide content 8%, product name: GP-3050NS, manufactured by Sanyo Chemical Industries, Ltd. Polyol-B: Polyether polyol, functionality 3, molecular weight 5000, hydroxyl value 27.6 mg KOH / g, ethylene oxide content 15%, product name: GP6015, manufactured by Carpenter Polyol-C: Polyether polyol, functionality 3, molecular weight 4000, hydroxyl value 52 mg KOH / g, ethylene oxide content 75%, product name: EP-505S, manufactured by Mitsui Chemicals, Inc. Polyol-D: Polymer polyol, functionality 3, molecular weight 5000, hydroxyl value 27.5 mg KOH / g, ethylene oxide content 11%, product name: POP-3128, manufactured by Mitsui Chemicals, Inc. Cellulose: Product name: ARBOCEL (registered trademark) UFC100, manufactured by Rettenmeyer CMC-A: Water-insoluble sodium carboxymethylcellulose, degree of etherification 0.2 to 0.3, product name: Sunrose (registered trademark) SLD-F1, manufactured by Nippon Paper Industries Co., Ltd. CMC-B: Water-soluble sodium carboxymethylcellulose, degree of etherification 0.9, product name: CMC Daicel (registered trademark) 2252, manufactured by Daicel FineChem Co., Ltd. Foam stabilizer: Silicone surfactant, product name: B-8110, manufactured by Evonik Amine catalyst: N,N-dimethylaminohexanol, product name: Kao Raiser No. 25, manufactured by Kao Corporation Tin catalyst: Stannous octoate, product name: MRH-110, manufactured by Johoku Chemical Industry Co., Ltd. Polyisocyanate: 2,4 tolylene diisocyanate / 2,6 tolylene diisocyanate = 80 / 20, product name: Cosmonate T-80, manufactured by Mitsui Chemicals, Inc.

[0042] The density, moisture absorption rate, moisture release rate, and swelling rate of the polyurethane foams obtained in each Example and Comparative Example were measured by the above-mentioned methods, and the washability was judged. Based on the measurement results and the judgment results, the moisture absorption rate, moisture release rate, swelling rate, and washability were evaluated, and an overall evaluation was made based on these evaluations.

[0043] The moisture absorption evaluation was as follows: moisture absorption rate of 4.0% or more: "Good", 3% to less than 4%: "Average", and less than 3%: "Poor". The moisture release property evaluation was as follows: moisture release rate of 50% or more: "Good", 50% to less than 30%: "Average", and less than 30%: "Poor". The swelling evaluation was as follows: swelling rate less than 105%: "A", swelling rate from 105 to less than 130%: "Good", swelling rate of 130% or more: "Poor". The washability evaluation was "good" if there was neither deformation nor embrittlement (powdering), and "poor" if there was either one of them. The overall rating is the lowest rating in the moisture absorption rating, moisture release rating, swelling rating, and washability rating. For example, if all are rated "good" or above, the overall rating is "good." If there is at least one "good" and the others are rated "good" or above, the overall rating is "good." If there is at least one "bad" and the others are rated "good" or "bad" or above, the overall rating is "bad."

[0044] Example 1 is an example in which 100 parts by weight of polyol A having an ethylene oxide content of 8% is used as the polyol, and 25 parts by weight of CMC-A is used as the carboxymethyl cellulose, and the total EO% is 8%, and the total amount of carboxymethyl cellulose is 25 parts by weight. Example 1 has a density of 23.8 kg / m 3 The moisture absorption rate was 4.0%, with a moisture absorption rating of "Good", the moisture release rate was 75%, with a moisture release rating of "Good", the swelling rate was 101%, with a swelling rating of "Excellent", the washability rating of "Good", and the overall rating of "Good".

[0045] Example 2 is an example in which 100 parts by weight of polyol A having an ethylene oxide content of 8% is used as the polyol, and 6 parts by weight of CMC-B is used as the carboxymethyl cellulose, with a total EO% of 8% and a total amount of carboxymethyl cellulose of 6 parts by weight. Example 2 has a density of 26.4 kg / m 3 , moisture absorption rate 4.4%, moisture absorption rating "Good", moisture release rate 73%, moisture release rating "Good", swelling rate 101%, swelling rating "Excellent", washability rating "Good", overall rating "Good".

[0046] Example 3 is an example in which 100 parts by weight of polyol A having an ethylene oxide content of 8% is used as the polyol, and 30 parts by weight of CMC-B is used as the carboxymethyl cellulose, and the total EO% is 8%, and the total amount of carboxymethyl cellulose is 30 parts by weight. Example 3 has a density of 26.3 kg / m 3 , moisture absorption rate 10.7%, moisture absorption rating "Good", moisture release rate 54%, moisture release rating "Good", swelling rate 101%, swelling rating "Excellent", washability rating "Good", overall rating "Good".

[0047] Example 4 is an example in which 100 parts by weight of polyol A having an ethylene oxide content of 8% is used as the polyol, 15 parts by weight of cellulose, and 15 parts by weight of CMC-B as carboxymethyl cellulose are used, and the total EO% is 8%, and the total amount of carboxymethyl cellulose is 15 parts by weight. Example 4 has a density of 24.7 kg / m 3 , moisture absorption rate 7.8%, moisture absorption rating "Good", moisture release rate 59%, moisture release rating "Good", swelling rate 100%, swelling rating "Excellent", washability rating "Good", overall rating "Good".

[0048] In Example 5, 60 parts by weight of polyol A having an ethylene oxide content of 8% and 40 parts by weight of polyol B having an ethylene oxide content of 15% were used as polyols, and 30 parts by weight of CMC-B was used as carboxymethyl cellulose, with a total EO% of 11% and a total amount of carboxymethyl cellulose of 30 parts by weight. Example 5 had a density of 25.9 kg / m 3, moisture absorption rate 10.8%, moisture absorption rating "Good", moisture release rate 54%, moisture release rating "Good", swelling rate 101%, swelling rating "Excellent", washability rating "Good", overall rating "Good".

[0049] Comparative Example 1 is an example in which 70 parts by weight of polyol C having an ethylene oxide content of 70% and 30 parts by weight of polyol D having an ethylene oxide content of 11% are used as polyols, and no carboxymethyl cellulose is used, and the total EO% is 56%, and the total amount of carboxymethyl cellulose is 0 parts by weight. Comparative Example 1 has a density of 34.9 kg / m 3 , moisture absorption rate 8.2%, moisture absorption rating "Good", moisture release rate 43%, moisture release rating "Good", swelling rate 109%, swelling rating "Good", washability rating "Poor", overall rating "Poor".

[0050] Comparative Example 2 is an example in which 100 parts by weight of polyol A having an ethylene oxide content of 8% is used as the polyol, and no carboxymethyl cellulose is used, so the total EO% is 8%, and the total amount of carboxymethyl cellulose is 0 parts by weight. Comparative Example 2 has a density of 26.6 kg / m 3 , moisture absorption rate 1.0%, moisture absorption rating "×", moisture release rate 100%, moisture release rating "〇", swelling rate 101%, swelling rating "◎", washability rating "〇", overall rating "×".

[0051] Comparative Example 3 is an example in which 100 parts by weight of polyol A having an ethylene oxide content of 8% as the polyol, 30 parts by weight of cellulose, and no carboxymethyl cellulose are used, and the total EO% is 8%, and the total amount of carboxymethyl cellulose is 0 parts by weight. Comparative Example 3 has a density of 23.0 kg / m 3 , moisture absorption rate 2.4%, moisture absorption rating "×", moisture release rate 71%, moisture release rating "〇", swelling rate 101%, swelling rating "◎", washability rating "〇", overall rating "×".

[0052] Comparative Example 4 is an example in which 100 parts by weight of polyol A having an ethylene oxide content of 8% is used as the polyol and 5 parts by weight of CMC-B as the carboxymethyl cellulose, the total EO% is 8%, and the total amount of carboxymethyl cellulose is 5 parts by weight. Comparative Example 4 has a density of 26.5 kg / m 3 , moisture absorption rate 3.8%, moisture absorption rating "△", moisture release rate 72%, moisture release rating "〇", swelling rate 101%, swelling rating "◎", washability rating "〇", overall rating "△".

[0053] Comparative Example 5 is an example in which 100 parts by weight of polyol A having an ethylene oxide content of 8% as the polyol, 2.5 parts by weight of cellulose, and 2.5 parts by weight of CMC-B as the carboxymethyl cellulose are used, and the total EO% is 8%, and the total amount of the carboxymethyl cellulose is 2.5 parts by weight. Comparative Example 5 has a density of 25.6 kg / m 3 , moisture absorption rate 3.9%, moisture absorption rating "△", moisture release rate 78%, moisture release rating "〇", swelling rate 100%, swelling rating "◎", washability rating "〇", overall rating "△".

[0054] Comparative Example 6 is an example in which 60 parts by weight of polyol A having an ethylene oxide content of 8% and 40 parts by weight of polyol B having an ethylene oxide content of 15% are used as polyols, and no carboxymethyl cellulose is used, and the total EO% is 11%, and the total amount of carboxymethyl cellulose is 0 parts by weight. Comparative Example 6 has a density of 26.4 kg / m 3 , moisture absorption rate 1.4%, moisture absorption rating "×", moisture release rate 75%, moisture release rating "〇", swelling rate 101%, swelling rating "◎", washability rating "〇", overall rating "×".

[0055] Comparative Example 7 is an example in which 50 parts by weight of polyol A having an ethylene oxide content of 8% and 50 parts by weight of polyol B having an ethylene oxide content of 15% are used as polyols, and no carboxymethyl cellulose is used, and the total EO% is 12%, and the total amount of carboxymethyl cellulose is 0 parts by weight. Comparative Example 7 has a density of 26.0 kg / m 3, moisture absorption rate 1.7%, moisture absorption rating "×", moisture release rate 83%, moisture release rating "〇", swelling rate 101%, swelling rating "◎", washability rating "×", overall rating "×".

[0056] Thus, according to the present invention, a polyurethane foam having good moisture absorption and release properties and low swelling properties can be obtained, and is suitable for use in bedding cushions such as mattresses, and clothing pads such as shoulder pads and bra pads.

Claims

[Claim 1] 1. An article comprising a polyurethane foam formed from a polyurethane foam composition comprising a polyol, a catalyst, a blowing agent, an additive, and a polyisocyanate, the polyol is a polyether polyol, the ethylene oxide content of the entire polyol is 0 to 11%; The additive contains 6 to 40 parts by weight of carboxymethyl cellulose relative to 100 parts by weight of the polyol, The article is a bedding cushion or a clothing pad.

Images