Polyurethane foam and its manufacturing method
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Patents
- Current Assignee / Owner
- INOAC CORP
- Filing Date
- 2025-07-10
- Publication Date
- 2026-07-30
Smart Images
Figure 0007897994000001 
Figure 0007897994000002
Abstract
Description
[Technical Field]
[0001] This invention relates to polyurethane foam and a method for producing the same. [Background technology]
[0002] A mask made of polyurethane foam that covers part of the face, including the mouth and nostrils, has been proposed (Patent Document 1).
[0003] Furthermore, masks are required not only to be hygienic, but also to have a clean appearance in terms of color and other factors. However, the polyurethane foam used in conventional masks does not take antibacterial or antiviral properties into consideration, and is also prone to discoloration due to ultraviolet light and other factors. [Prior art documents] [Patent Documents]
[0004] [Patent Document 1] Japanese Patent Publication No. 2016-137119 [Overview of the Initiative] [Problems that the invention aims to solve]
[0005] The present invention has been made in view of the above points, and aims to provide a polyurethane foam that has antibacterial and antiviral properties and is suitable for applications such as hygiene products like masks, clothing products like bra pads, or filters. [Means for solving the problem]
[0006] The first embodiment is a polyurethane foam formed from a polyurethane foam composition comprising a polyol, a polyisocyanate, a blowing agent, a catalyst, and an additive, wherein an antibacterial agent is included as the additive, and the antibacterial agent is a porous silicate mineral synthesized from a metal oxide, silica, and alumina.
[0007] The second embodiment is characterized in that, in the first embodiment, the additive is composed of any of the following: an antioxidant, an ultraviolet inhibitor, a photochromic inhibitor, or a NOx inhibitor.
[0008] A third embodiment is characterized in that, in the first or second embodiment, the yellowing is characterized by a ΔYI value of 50 or less.
[0009] The fourth embodiment is characterized in that, in any one of the first to third embodiments, the peel strength is 4N or greater.
[0010] The fifth embodiment is characterized in that, in any one of the first to fourth embodiments, the antibacterial agent is an antiviral agent having antiviral properties, and the polyurethane foam has antiviral properties.
[0011] A sixth aspect is a method for producing polyurethane foam by foaming a polyurethane foam composition comprising a polyol, a polyisocyanate, a foaming agent, a catalyst, and an additive, characterized in that an antimicrobial agent is included as the additive, and the antimicrobial agent is a porous silicate mineral synthesized from a metal oxide, silica, and alumina.
[0012] The seventh aspect is characterized in that, in the sixth aspect, the additive is composed of any of the following: an antioxidant, an ultraviolet inhibitor, a photochromic inhibitor, or a NOx inhibitor.
[0013] The eighth aspect is characterized in that, in the sixth or seventh aspect, the antibacterial agent is an antiviral agent having antiviral properties, and the polyurethane foam has antiviral activity. [Effects of the Invention]
[0014] According to the present invention, a polyurethane foam having antibacterial and antiviral properties can be obtained from a single material. [Brief explanation of the drawing]
[0015] [Figure 1] It is a figure showing a mask of one embodiment of the present invention. [Figure 2] It is a table showing the formulations and physical properties etc. of each comparative example and each example.
Mode for Carrying Out the Invention
[0016] Hereinafter, embodiments of the polyurethane foam of the present invention will be described. The punched body 10A shown in (1-A) of FIG. 1 is formed by punching a mask shape from the polyurethane foam of the present invention. Reference numeral 13 is an opening for ear hanging. The punched body 10A is folded left and right at the central portion 15 which is the center of the left and right of the face, and as shown in (1-B) of FIG. 1, it is welded with a predetermined width along the central portion 15 to form a mask 10. The shaded portion indicated by reference numeral 16 is the welded portion. The welded portion 16 of the central portion 15 is determined in the welding range so that when the mask 10 is expanded left and right and used, the central portion 15 bulges outward to have a three-dimensional shape corresponding to the swelling of the nose. Note that the mask formed from the polyurethane foam of the present invention is not limited to the form of the mask shown in FIG. 1.
[0017] The polyurethane foam of the present invention is formed by foaming from a polyurethane foam composition containing a polyol, a polyisocyanate, a foaming agent, a catalyst, and an additive.
[0018] The polyol is a polyhydric alcohol or a product obtained by adding an alkylene oxide such as ethylene oxide (EO) or propylene oxide (PO) thereto, and a polyol for a flexible polyurethane foam can be used. For example, any of a polyether polyol, a polyester polyol, and a polyether ester polyol may be used, and one kind or a plurality of kinds thereof may be used.
[0019] Examples of polyether polyols include polyether polyols obtained by adding alkylene oxides such as ethylene oxide (EO) and propylene oxide (PO) to polyhydric alcohols such as ethylene glycol, diethylene glycol, propylene glycol, dipropylene glycol, butylene glycol, neopentyl glycol, glycerin, pentaerythritol, trimethylolpropane, sorbitol, and sucrose.
[0020] Examples of polyester polyols include those obtained by polycondensation of aliphatic carboxylic acids such as malonic acid, succinic acid, and adipic acid, or aromatic carboxylic acids such as phthalic acid, with aliphatic glycols such as ethylene glycol, diethylene glycol, and propylene glycol. Furthermore, examples of polyether ester polyols include those obtained by reacting the aforementioned polyether polyol with a polybasic acid to produce polyester, or those having both polyether and polyester segments within a single molecule.
[0021] Regarding the polyol, it is preferable to use one or more polyols having a hydroxyl value (OHV) of 30-80 mgKOH / g, 2-4 functional groups, and a weight-average molecular weight of 1500-5000. In particular, when polyester polyols or polyols containing ester components are used, high adhesion by welding and high peel strength can be achieved. On the other hand, when polyether polyols are used, they have excellent resistance to humid heat aging, making them preferable for use in masks that can be washed repeatedly.
[0022] Polyisocyanates can be aliphatic or aromatic polyisocyanates having two or more isocyanate groups, mixtures thereof, or modified polyisocyanates obtained by modifying them. Examples of aliphatic polyisocyanates include hexamethylene diisocyanate, isophorone diisocyanate, and dicyclohexamethane diisocyanate, while examples of aromatic polyisocyanates include toluene diisocyanate (TDI), diphenylmethane diisocyanate (MDI), naphthalene diisocyanate, xylylene diisocyanate, and polymeric MDI (crude MDI). Other prepolymers can also be used.
[0023] The isocyanate index (INDEX) is preferably 100 or higher, and more preferably 103 to 120. The isocyanate index is calculated by dividing the number of moles of isocyanate groups in the isocyanate by the total number of moles of active hydrogen groups such as hydroxyl groups in the polyol, and multiplying the result by 100. It is calculated as [NCO equivalent of isocyanate / active hydrogen equivalent × 100].
[0024] As a blowing agent, water, alternative chlorofluorocarbons (CFCs), or hydrocarbons such as pentane can be used alone or in combination. In the case of water, carbon dioxide is generated during the reaction between the polyol and polyisocyanate, and foaming occurs due to this carbon dioxide. The amount of water used as a blowing agent is preferably 1.0 to 4.0 parts by weight per 100 parts by weight of polyol.
[0025] As a catalyst, known urethane catalysts can be used in combination. For example, amine catalysts such as triethylamine, triethylenediamine, diethanolamine, dimethylaminomorpholine, N-ethylmorpholine, and tetramethylguanidine, tin catalysts such as stanus octoate and dibutyltin dilaurate, and metal catalysts such as phenylmercury propionate or lead octenoate (also called organometallic catalysts) can be used. Either an amine catalyst or a metal catalyst, or both, may be used. The amount of amine catalyst is preferably 0.1 to 3 parts by weight per 100 parts by weight of polyol. The amount of metal catalyst is preferably 0 to 0.1 parts by weight.
[0026] The additives include antibacterial agents. Furthermore, it is preferable that the additives include one of the following: antioxidants, UV absorbers, photochromic inhibitors, or NOx chromophobic inhibitors.
[0027] The antibacterial agent is an antiviral agent having antiviral activity, and porous silicate minerals synthesized from metal oxides, silica, and alumina are used. Examples of porous silicate minerals synthesized from metal oxides, silica, and alumina include aluminum silicate metal salts or their hydrates. Zinc oxide is preferred as the metal oxide. Porous silicate minerals (aluminum silicate metal salts) synthesized from silica, alumina, and metal oxides provide superior antibacterial and antiviral effects compared to silver-based antibacterial agents. In porous silicate minerals using zinc oxide as the metal oxide, the preferred ratio of the three components is SiO2: 5-80 mol%, ZnO: 5-65 mol%, and Al2O3: 1-60 mol%. An example of a suitable compositional formula for silica, alumina, and zinc oxide in a porous silicate mineral is aSiO2·Al2O3·bZnO. In the above compositional formula, it is preferable that a satisfies 7≦a≦10 and b satisfies 3≦b≦7, and more preferably that a satisfies 8≦a≦9 and b satisfies 4≦b≦6. The average particle size of porous silicate minerals, as measured by the Coulter counter method, is 1 to 10 μm, with 2 to 5 μm being preferred. The amount of antibacterial agent (antiviral agent having antiviral activity) is preferably 0.1 to 3 parts by weight, more preferably 0.3 to 3 parts by weight, even more preferably 0.4 to 2.0 parts by weight, and particularly preferably 0.5 to 1.5 parts by weight, per 100 parts by weight of polyol.
[0028] Examples of antioxidants include phenolic antioxidants, amine antioxidants, and especially BHT (dibutylcresol) and hindered phenolic antioxidants. By incorporating antioxidants into the polyurethane foam composition, a discoloration prevention effect on the polyurethane foam can be obtained. The amount of antioxidant is preferably 0.1 to 3 parts by weight, and more preferably 0.5 to 1.0 parts by weight, per 100 parts by weight of polyol.
[0029] Examples of UV absorbers include benzotriazole-based UV absorbers, benzophenone-based UV absorbers, benzoate-based UV absorbers, and cyanoacrylate-based UV absorbers.
[0030] Examples of benzotriazole-based UV absorbers include 2-(2H-benzotriazole-2-yl)-p-cresol, 2-(2'-hydroxy-3',5'-di-t-amylphenyl)benzotriazole, 2-(2-hydroxy-5-(1,1,3,3-tetraethylbutyl)phenyl)benzotriazole, 2,2'-methylenebis(6-(2Hbenzotriazole-2-yl)-4-1,1,3,3-(tetramethylbutyl)phenol), 2-(2'-hydroxy-5'-methylphenyl)benzotriazole, and 2-[5-chloro(2H)-benzotriazole-2-yl]-4-methyl-6-(t-butyl)phenol.
[0031] Examples of benzophenone-based UV absorbers include 2-hydroxy-4-methoxybenzophenone, 5-benzoyl-4-hydroxy-2-methoxybenzene sulfonic acid 2-hydroxy-4-n-octyloxybenzophenone, and 2,4-dihydroxybenzophenone.
[0032] Examples of benzoate-based UV absorbers include 2,4-t-butylphenyl-3,5-di-t-butyl-4-hydroxybenzoate.
[0033] Examples of cyanoacrylate-based UV absorbers include ethyl-2-cyano-3,3-diphenylacrylate and 2-ethylhexyl-2-cyano-3,3-diphenylacrylate.
[0034] By incorporating an ultraviolet absorber, the effect of suppressing discoloration of polyurethane foam due to ultraviolet light can be enhanced. The amount of ultraviolet absorber is preferably 0.05 to 0.5 parts by weight, and more preferably 0.1 to 0.3 parts by weight, per 100 parts by weight of polyol.
[0035] Hindered amines can be used as photochromic inhibitors (light stabilizers). By incorporating photochromic inhibitors, the effect of suppressing discoloration of polyurethane foam caused by sunlight and ultraviolet rays can be enhanced.
[0036] Examples of hindered amine-based photochromic inhibitors include bis(1,2,2,6,6-pentamethyl-4-piperidinyl) sebacate, methyl 1,2,2,6,6-pentamethyl-4-piperidyl sebacate, bis(2,2,6,6-tetramethyl-4-piperidinyl) sebacate, poly((6-((1,1,3,3-tetramethylbutyl)amino)-s-tetrazin-2,4-digyl)(2,2,6,6-tetramethyl-4-piperidyl)imino)hexamethylene(2,2,6,6-tetramethyl-4-piperidyl)imino)), and bis(1,2,2,6,6-pentamethyl-4-piperidyl)[[3,5-bis(1,1-dimethylethyl)-4-hydroxyphenyl]methyl]butylmalonate. The amount of light-induced discoloration inhibitor is preferably 0.05 to 0.5 parts by weight, and more preferably 0.05 to 0.3 parts by weight, per 100 parts by weight of polyol.
[0037] Examples of NOx discoloration inhibitors include phosphorus-based antioxidants and sulfur-based antioxidants. By incorporating NOx discoloration inhibitors, it is possible to suppress discoloration of polyurethane foam caused by NOx contained in the atmosphere. Examples of phosphorus-based antioxidants include pentaerythritol diphosphate and diisodecylpentaerythritol diphospite. Examples of sulfur-based antioxidants include bis{2-methyl-4-[3-n-alkyl(C12 or C14)thiopropionyloxy]-5-t-butylphenyl}sulfide. The amount of NOx anti-discoloration agent is preferably 0.5 to 2 parts by weight, and more preferably 0.7 to 1.5 parts by weight, per 100 parts by weight of polyol.
[0038] Other additives may be added to the polyurethane foam composition. Examples include foam stabilizers and colorants. As foam stabilizers, those known for use with flexible polyurethane foam can be used. Examples include silicone-based foam stabilizers, fluorine-containing compound-based foam stabilizers, and known surfactants. The coloring agents are added as needed to match the user's preference for the mask.
[0039] Slab foaming is preferred for foaming polyurethane foam compositions. Slab foaming is a method in which the polyurethane foam composition is mixed, extruded onto a belt conveyor, and foamed under atmospheric pressure and at room temperature. Furthermore, the mask 10 shown in Figure 1 can be formed from the foamed polyurethane foam as follows. Polyurethane foam is processed to form a sheet, for example, about 2 mm thick. The resulting sheet of polyurethane foam is then punched out using a die with a mask-shaped mold to form a punched-out body. Next, the punched-out body is folded in the center, which is the left and right center of the face, and placed in a welding die. A predetermined width is then welded along the center to form the mask. Welding can be performed, for example, by pressing the folded punched-out body at a temperature (mold temperature) of 200 to 300°C for a predetermined time. [Examples]
[0040] Polyurethane foam compositions were prepared using the following components, according to the formulations of each comparative example and each example shown in Figure 2. The prepared polyurethane foam compositions were then mixed and foamed to produce polyurethane foam.
[0041] Polyol; polyester polyol, molecular weight: 2600, number of functional groups: 2.4, hydroxyl value: 51 mgKOH / g, product name: N-101, manufactured by Nippon Polyurethane Industry Co., Ltd. • Amine catalyst; N-ethylmorpholine, Product name: Kaolizer No. 22, manufactured by Kao Corporation. • Foam stabilizer; Silicone foam stabilizer, Product name: SE232, manufactured by Momentive Corporation. • Foaming agent; water • Antioxidant; Hindered phenol type, benzenepropanoic acid, 3,5-bis(1,1-methyl-ethyl)-4 hydroxy-,C7-C9 side-chain alkyl ester, Product name: I-1135, manufactured by Ciba Specialty Chemicals. • UV absorber; benzotriazole-based, product name: T-571, manufactured by BASF. • Anti-coloration agent; hindered amine type, product name: T-765, manufactured by BASF. • NOx discoloration inhibitor; phosphorus-based antioxidant, product name: CS-22LF, manufactured by Momentive Performance Materials Japan LLC. • Antibacterial agent; silver-based, product name: Zeomic AW10N, manufactured by Sinanen Zeomic Co., Ltd. • Antibacterial and antiviral agent: The antibacterial agent of the present invention (an antiviral agent having antiviral properties), a porous silicate mineral of zinc oxide / silicon dioxide / aluminum oxide, average particle size 2.5~4.5 μm, product name: Laonite SF, manufactured by Lion Specialty Chemicals, composition formula of silica, alumina and zinc oxide: 8.6SiO2·Al2O3·4.8ZnO • Isocyanate; T-65, 2,4-TDI / 2,6-TDI = 65 / 35
[0042] The foaming properties of polyurethane foam were evaluated. A "○" was used to indicate good foaming without punctures, downsizing, or shrinkage, while a "×" was used to indicate poor foaming. The evaluation results are shown in Figure 2.
[0043] The physical properties of the fabricated polyurethane foam were measured as follows: density (JIS K6400), cell count (JIS K 6400), tensile strength (JIS K 6400-5), elongation (JIS K 6400-5), and air permeability (JIS L 1096 Method A). The physical properties of the polyurethane foam were evaluated based on the measurement results. A "○" indicates that the physical properties meet the current equivalent or product standards, while a "×" indicates significant deterioration or decline. The measurement results are shown in Figure 2.
[0044] We measured the pollen-collecting, antibacterial, and antiviral properties of polyurethane foam. Pollen collection was conducted in accordance with the "Pollen Particle Collection (Filtration) Efficiency Test Method" of the Japan Hygiene Materials Industry Association, National Mask Manufacturers Association. Specifically, natural particles with a particle size of approximately 30 μm, equivalent to that of cedar pollen, were used as test particles, and these were uniformly dispersed and dropped onto a 2 mm thick sheet of polyurethane foam at a constant flow rate. The amount of the specified amount of test particles that passed through the polyurethane foam was measured, and the collection efficiency (%) was calculated. The measurement results are shown in Figure 2. A collection efficiency of 99% or higher is preferable.
[0045] Antibacterial activity was measured for Staphylococcus aureus and Escherichia coli based on JIS K6400-9:2019. The common logarithm of viable cell count after 24 hours of shaking culture in the control group (air shaking) was 5.02. The measurement results are shown in Figure 2. For both Staphylococcus aureus and Escherichia coli, an antibacterial activity value of 2.0 or higher is preferable, 3.0 or higher is more preferable, and 4.0 or higher is particularly preferable.
[0046] Antiviral activity was measured against influenza A virus using the JIS L 1922 plaque assay method, with host cells being influenza A. An activity value of 1 or higher but less than 2 indicates a mortality rate of 90% or higher, an activity value of 2 or higher but less than 3 indicates a mortality rate of 99% or higher, and an activity value of 3 or higher indicates a mortality rate of 99.9% or higher. Preferably, the antiviral activity value is 2.0 or higher, more preferably 3.0 or higher, and particularly preferably 4.0 or higher.
[0047] The resistance to yellowing of polyurethane foam was measured and evaluated. To measure resistance to yellowing, a polyurethane foam test specimen (t10mm × 50mm × 150mm) was irradiated at 63°C for 10 hours using a fade meter, and the color difference ΔYI before and after irradiation was measured. The measurement results are shown in Figure 2. Resistance to yellowing is preferable when the ΔYI value is less than 50, and more preferably less than 20.
[0048] A mask was fabricated from polyurethane foam as follows, and its peel strength was measured. The mask was fabricated by first cutting and shaping polyurethane foam into a sheet measuring 2 mm thick x 200 mm x 150 mm, then punching out the resulting sheet of polyurethane foam into a mask shape to form the punched-out body 10A shown in Figure 1 (1-A), folding the punched-out body 10A in the center 15, placing it in a welding die, and welding it along the center by pressing at a welding temperature (die temperature) of 220°C for a pressing time of 1.5 seconds to produce the mask 10 shown in Figure 1 (1-B).
[0049] To measure the peel strength, after preparing the mask 10, the mask 10 was left at room temperature for one day. A test specimen was prepared by cutting the mask 10 to a width of 25 mm with the central part 15 in the center. The test specimen was then set in the chuck of the Tensilon testing machine with the welded part in the center, the distance between the chucks was set to 35 mm, and peeling was performed at a tensile speed of 200 mm / min for 180 degrees to measure the peel strength (unit: N). The measurement results are shown in Figure 2. A peel strength of 4 N or higher is preferable, and 6 N or higher is even more preferable.
[0050] The results for each comparative example and each example are shown below. • Comparative Example 1 Comparative Example 1 is an example in which the polyurethane foam composition consists of 100 parts by weight of polyol, 2.00 parts by weight of amine catalyst, 1.51 parts by weight of foam stabilizer, 1.40 parts by weight of blowing agent, 0.50 parts by weight of antioxidant, and an isocyanate index of 105.6, and does not contain any ultraviolet absorber, photochromic inhibitor, NOx chromic inhibitor, antibacterial agent, or antimicrobial / viral agent (the antibacterial agent of the present invention).
[0051] Comparative Example 1 has a density of 71.2 kg / m³. 3 70 cells / 25mm, tensile strength 266kPa, elongation 439%, air permeability 60.5ml / cm² 2 The material has a foaming property (○) and physical properties (○). Furthermore, it exhibits a pollen capture rate of 99.6%, a peel strength of 6.9N, antibacterial activity of 0.0 against Staphylococcus aureus and Escherichia coli, antiviral activity of 0.0, and resistance to yellowing (ΔYI) of 50.1.
[0052] • Comparative Example 2 Comparative Example 2 has the same formulation as Comparative Example 1, except that 0.20 parts by weight of a silver-based antibacterial agent is added as the antibacterial agent in Comparative Example 1. Comparative Example 2 has a density of 73.6 kg / m³. 3 70 cells / 25mm, tensile strength 348kPa, elongation 491%, air permeability 69ml / cm² 2The material has a foaming property (○) and good physical properties (○). Furthermore, it exhibits a pollen capture rate of 99.6%, a peel strength of 10.0N, antibacterial activity of more than 4.0 against Staphylococcus aureus and more than 7.3 against Escherichia coli, antiviral activity of 0.0, and resistance to yellowing (ΔYI) of 59.2. Compared to Comparative Example 1, Comparative Example 2 showed improved antibacterial properties due to the inclusion of a silver-based antibacterial agent, but no effect was obtained in terms of antiviral properties, and the resistance to yellowing and degeneration worsened compared to Comparative Example 1.
[0053] • Example 1 Example 1 has the same formulation as Comparative Example 2, except that 0.50 parts by weight of an antibacterial and antiviral agent (the antibacterial agent of the present invention) made of a porous silicate mineral of zinc oxide / silicon dioxide / aluminum oxide is added instead of 0.20 parts by weight of the silver-based antibacterial agent in Comparative Example 2. Example 1 has a density of 71.0 kg / m³. 3 76 cells / 25mm, tensile strength 270kPa, elongation 421%, air permeability 75ml / cm² 2 The material has a foaming property (○) and good physical properties (○). Furthermore, it exhibits 99.1% pollen capture, a peel strength of 11.0N, antibacterial activity against Staphylococcus aureus (greater than 3.8) and against Escherichia coli (5.4), antiviral activity (4.0), and resistance to yellowing (ΔYI) of 47.3. Compared to Comparative Example 2, Example 1 incorporates an antibacterial and antiviral agent (the antibacterial agent of the present invention) made of a porous silicate mineral of zinc oxide / silicon dioxide / aluminum oxide instead of a silver-based antibacterial agent. This resulted in improved antibacterial activity, antiviral activity, and reduced resistance to yellowing.
[0054] • Example 2 Example 2 consists of the same formulation as Example 1, except that it contains 0.21 parts by weight of an ultraviolet absorber, 0.11 parts by weight of a photochromic inhibitor, and 0.98 parts by weight of a NOx antichromic agent. Example 2 has a density of 73.8 kg / m³. 3 78 cells / 25mm, tensile strength 264kPa, elongation 379%, air permeability 50ml / cm² 2 / s, foaming property is "〇", physical properties are "〇". Also, pollen collection is 99.5%, peel strength is 4.2 N, antibacterial property has an antibacterial activity value of 4.0 against Staphylococcus aureus, an antibacterial activity value of 5.7 against Escherichia coli, antiviral property has an activity value of 4.0, and yellowing resistance has a ΔYI of 17.6. Example 2 has antibacterial and antiviral effects similar to those of Example 1. Also, in Example 2, compared with Example 1, due to the addition of an ultraviolet absorber, a photochromism inhibitor, and a NOx discoloration inhibitor, the yellowing resistance has improved from that of Example 1.
[0055] ·Example 3 Example 3 has the same formulation as Example 2, except that the amount of the ultraviolet absorber in the formulation of Example 2 is reduced from 0.21 parts by weight to 0.16 parts by weight, the amount of the photochromism inhibitor is reduced from 0.11 parts by weight to 0.08 parts by weight, and the amount of the NOx discoloration inhibitor is reduced from 0.98 parts by weight to 0.73 parts by weight. Example 3 has a density of 76.1 kg / m 3 , 70 cells / 25 mm cell count, 339 kPa tensile strength, 528% elongation, 65 ml / cm air permeability 2 / s, foaming property is "〇", physical properties are "〇". Also, pollen collection is 99.1%, peel strength is 11.2 N, antibacterial property has an antibacterial activity value of 4.3 against Staphylococcus aureus, an antibacterial activity value of 4.7 against Escherichia coli, antiviral property has an activity value of 4.0, and yellowing resistance has a ΔYI of 25.6. Example 3 has antibacterial and antiviral effects similar to those of Example 2. Also, in Example 3, compared with Example 2, due to the reduction of the ultraviolet absorber, the photochromism inhibitor, and the NOx discoloration inhibitor, the peel strength has improved from that of Example 2, and the yellowing resistance has decreased slightly from that of Example 2.
[0056] ·Example 4 Example 4 has the same formulation as Example 3, except that the amount of the antibacterial and antiviral agent (the antibacterial agent of the present invention) in the formulation of Example 3 is increased from 0.50 parts by weight to 1.00 parts by weight. Example 4 has a density of 76.8 kg / m 3 , 70 cells / 25 mm cell count, 305 kPa tensile strength, 440% elongation, 66 ml / cm air permeability 2The material has a foaming property (○) and good physical properties (○). Furthermore, it exhibits 99.5% pollen capture, a peel strength of 11.0N, antibacterial activity against Staphylococcus aureus greater than 3.8 and against Escherichia coli of 6.4, antiviral activity of 4.2, and resistance to yellowing (ΔYI) of 25.6. Compared to Example 3, Example 4 showed improved antibacterial and antiviral effects due to an increased amount of the antibacterial and antiviral agent (the antibacterial agent of the present invention).
[0057] Thus, the polyurethane foam of the present invention contains an antibacterial agent (an antiviral agent with antiviral properties) made of a porous silicate mineral (a porous silicate mineral of zinc oxide / silicon dioxide / aluminum oxide) synthesized from metal oxides, silica, and alumina, and therefore possesses antibacterial and antiviral properties, making it hygienic and suitable for applications such as masks that cover the mouth and nostrils of the face, clothing applications such as bra pads, or filters. Furthermore, antibacterial and antiviral properties can be obtained with a single material. [Explanation of Symbols]
[0058] 10A punched body 10 masks 13 Ear hook opening 15. The central part of the face 16 Welded area
Claims
1. In a polyurethane foam formed from a polyurethane foam composition containing a polyol, polyisocyanate, blowing agent, catalyst, and additives, The aforementioned additive contains an antibacterial agent. The aforementioned antibacterial agent is a porous silicate mineral synthesized from zinc oxide, silica, and alumina. The antibacterial agent is an antiviral agent having antiviral properties, and the polyurethane foam is a polyurethane foam characterized by having antiviral activity.
2. The polyurethane foam according to claim 1, characterized in that the additive contains one of the following: an antioxidant, an ultraviolet inhibitor, a photochromic inhibitor, and a NOx anti-coloration agent.