WO2017104600A1 - 軟質ポリウレタンフォーム、及びシート用パッド - Google Patents
軟質ポリウレタンフォーム、及びシート用パッド Download PDFInfo
- Publication number
- WO2017104600A1 WO2017104600A1 PCT/JP2016/086871 JP2016086871W WO2017104600A1 WO 2017104600 A1 WO2017104600 A1 WO 2017104600A1 JP 2016086871 W JP2016086871 W JP 2016086871W WO 2017104600 A1 WO2017104600 A1 WO 2017104600A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- polyurethane foam
- polyol
- flexible polyurethane
- stock solution
- foaming
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/48—Polyethers
- C08G18/4825—Polyethers containing two hydroxy groups
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
- B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
- B60N2/70—Upholstery springs ; Upholstery
- B60N2/7017—Upholstery springs ; Upholstery characterised by the manufacturing process; manufacturing upholstery or upholstery springs not otherwise provided for
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47C—CHAIRS; SOFAS; BEDS
- A47C27/00—Spring, stuffed or fluid mattresses or cushions specially adapted for chairs, beds or sofas
- A47C27/14—Spring, stuffed or fluid mattresses or cushions specially adapted for chairs, beds or sofas with foamed material inlays
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47C—CHAIRS; SOFAS; BEDS
- A47C7/00—Parts, details, or accessories of chairs or stools
- A47C7/02—Seat parts
- A47C7/18—Seat parts having foamed material included in cushioning part
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
- B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
- B60N2/90—Details or parts not otherwise provided for
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/08—Processes
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- C08G18/161—Catalysts containing two or more components to be covered by at least two of the groups C08G18/166, C08G18/18 or C08G18/22
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
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- C08G18/166—Catalysts not provided for in the groups C08G18/18 - C08G18/26
- C08G18/168—Organic compounds
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
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- C08G18/18—Catalysts containing secondary or tertiary amines or salts thereof
- C08G18/1808—Catalysts containing secondary or tertiary amines or salts thereof having alkylene polyamine groups
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- C08G18/32—Polyhydroxy compounds; Polyamines; Hydroxyamines
- C08G18/3203—Polyhydroxy compounds
- C08G18/3206—Polyhydroxy compounds aliphatic
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- C—CHEMISTRY; METALLURGY
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
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- C08G18/4816—Two or more polyethers of different physical or chemical nature mixtures of two or more polyetherpolyols having at least three hydroxy groups
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
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- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
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- C08G18/40—High-molecular-weight compounds
- C08G18/48—Polyethers
- C08G18/4829—Polyethers containing at least three hydroxy groups
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
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- C08G18/48—Polyethers
- C08G18/4833—Polyethers containing oxyethylene units
- C08G18/4837—Polyethers containing oxyethylene units and other oxyalkylene units
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/48—Polyethers
- C08G18/4833—Polyethers containing oxyethylene units
- C08G18/4837—Polyethers containing oxyethylene units and other oxyalkylene units
- C08G18/4841—Polyethers containing oxyethylene units and other oxyalkylene units containing oxyethylene end groups
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/63—Block or graft polymers obtained by polymerising compounds having carbon-to-carbon double bonds on to polymers
- C08G18/632—Block or graft polymers obtained by polymerising compounds having carbon-to-carbon double bonds on to polymers onto polyethers
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
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- C08G18/6666—Compounds of group C08G18/48 or C08G18/52
- C08G18/667—Compounds of group C08G18/48 or C08G18/52 with compounds of group C08G18/32 or polyamines of C08G18/38
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- C08G18/6677—Compounds of group C08G18/48 or C08G18/52 with compounds of group C08G18/32 or polyamines of C08G18/38 with compounds of group C08G18/3203 having at least three hydroxy groups
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
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- C08G18/72—Polyisocyanates or polyisothiocyanates
- C08G18/74—Polyisocyanates or polyisothiocyanates cyclic
- C08G18/76—Polyisocyanates or polyisothiocyanates cyclic aromatic
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
- C08J9/12—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent
- C08J9/125—Water, e.g. hydrated salts
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/02—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/0001—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor characterised by the choice of material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2075/00—Use of PU, i.e. polyureas or polyurethanes or derivatives thereof, as moulding material
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
- B29K2105/04—Condition, form or state of moulded material or of the material to be shaped cellular or porous
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
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- B29L2031/3005—Body finishings
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B29L2031/00—Other particular articles
- B29L2031/771—Seats
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- C—CHEMISTRY; METALLURGY
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- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G2110/00—Foam properties
- C08G2110/0008—Foam properties flexible
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2203/00—Foams characterized by the expanding agent
- C08J2203/10—Water or water-releasing compounds
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- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2205/00—Foams characterised by their properties
- C08J2205/06—Flexible foams
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- C08J2375/00—Characterised by the use of polyureas or polyurethanes; Derivatives of such polymers
- C08J2375/04—Polyurethanes
- C08J2375/08—Polyurethanes from polyethers
Definitions
- the present invention relates to a flexible polyurethane foam used for various molded articles such as automobile parts and indoor household goods, and a seat pad (cushion material for a seat) using the flexible polyurethane foam.
- This application claims priority based on Japanese Patent Application No. 2015-245707 for which it applied to Japan on December 16, 2015, and uses the content here.
- Soft polyurethane foam is used for various applications such as seat pads for vehicles such as automobiles, cushions for indoor chairs, bedding, and cushioning materials for flooring in houses. Various mechanical characteristics are required depending on the application, and a comfortable seating comfort is required for an automobile seat pad.
- the applicant has proposed a polyurethane foam of Patent Document 1 as a polyurethane foam having an appropriate repulsive force, light weight and excellent vibration absorption characteristics.
- This polyurethane foam is a polyurethane foam in which a polyurethane foam stock solution containing a polyol and an isocyanate is foam-molded, and a polyether polyol having a molecular weight, an unsaturation degree, and a molecular weight / functional group number within a specific range is used as a main component.
- an inorganic filler subjected to an organic treatment is blended.
- An object of the present invention is to provide a seat pad having excellent mechanical properties and less wobbling when seated, and a flexible polyurethane foam forming the seat pad.
- a flexible polyurethane foam obtained by foam-molding a foaming stock solution containing a polyol, a polyisocyanate, a foaming agent, and a catalyst, wherein the polyol has a weight average molecular weight Mw of 3000 to 8000 and a functional group number.
- a flexible polyurethane foam comprising a polyether polyol A having 3 to 4 and a polyether polyol B having a weight average molecular weight Mw of 1000 to 4000 and a functional group number of 2, wherein the polyisocyanate contains diphenylmethane diisocyanate.
- the polyol has a hydroxyl value of 200 mgKOH / g or more and has an alkyleneoxy group having 2 to 4 carbon atoms, [ethyleneoxy group]: [alkyleneoxy group having 3 or 4 carbon atoms] (mass ratio)
- a sheet pad comprising the flexible polyurethane foam according to any one of [1] to [3].
- the seat pad formed by the flexible polyurethane foam of the present invention has excellent mechanical properties and less wobble when seated.
- the flexible polyurethane foam of the present invention is a flexible polyurethane foam obtained by foam molding a foam stock solution containing a polyol, a polyisocyanate, a foaming agent, and a catalyst, and satisfies the following (i) to (iii).
- the polyol includes polyether polyol A having a weight average molecular weight Mw of 3000 to 8000 and a functional group number of 3 to 4.
- the polyol includes polyether polyol B having a weight average molecular weight Mw of 1000 to 4000 and a functional group number of 2.
- the polyisocyanate includes diphenylmethane diisocyanate (MDI).
- the flexible polyurethane foam of this invention satisfy
- the polyol has a hydroxyl value of 200 mgKOH / g or more and has an alkyleneoxy group having 2 to 4 carbon atoms, [ethyleneoxy group]: [alkyleneoxy group having 3 or 4 carbon atoms] (mass ratio) It is preferable to include polyol C having a ratio of 100: 0 to 60:40.
- the polyether polyol A contained in the foaming stock solution is a polyether polyol having a weight average molecular weight Mw of 3000 to 8000 and a functional group number (number of hydroxy groups) of 3 to 4.
- the polyether polyol A is preferably a polyether polyol obtained by ring-opening polymerization of an alkylene oxide because of good reactivity.
- the alkylene oxide include propylene oxide (PO) and ethylene oxide (EO).
- the alkylene oxide used as the material for the polyether polyol A may be one type or two or more types.
- the blending ratio (mass ratio) of PO and EO in the polyether polyol A contained in the foaming stock solution is not particularly limited.
- the EO / PO (mass ratio) is preferably 0/100 to 25/75, / 100 to 20/80 is more preferable.
- the EO / PO (mass ratio) is in the above range, a flexible polyurethane foam having excellent mechanical properties can be easily formed.
- the number of hydroxy groups (functional groups) contained in one molecule of the polyether polyol A contained in the foaming stock solution is 3-4. Within this range, the viscosity of the foaming stock solution becomes moderate, and a flexible polyurethane foam having excellent physical properties can be obtained.
- the weight average molecular weight Mw of the polyether polyol A contained in the foaming stock solution is preferably 4000 to 7500, more preferably 4500 to 7000, and still more preferably 5000 to 6500.
- the weight average molecular weight Mw is a value calculated as a polystyrene equivalent value by gel permeation chromatography (GPC method).
- the degree of unsaturation of the polyether polyol A contained in the foaming stock solution is preferably 0.03 meq / g or less.
- the degree of unsaturation is 0.03 meq / g or less, a flexible polyurethane foam having good physical properties such as durability can be obtained.
- the “unsaturation degree” is a method in which acetic acid liberated by acting mercuric acetate on unsaturated bonds in a sample is titrated with potassium hydroxide in accordance with Japanese Industrial Standard JIS K 1557-1970. Means the total degree of unsaturation (milliequivalent / g).
- the polyether polyol A contained in the foaming stock solution may be one type or two or more types.
- the total content of the polyether polyol is preferably 60% by mass or more, more preferably 65 to 90% by mass, and further preferably 65 to 85% by mass.
- the polyether polyol B contained in the foaming stock solution is a polyether polyol having a weight average molecular weight Mw of 1000 to 4000 and a functional group number (number of hydroxy groups) of 2.
- a polyether polyol obtained by ring-opening polymerization of an alkylene oxide is preferable because of good reactivity.
- the alkylene oxide include propylene oxide (PO) and ethylene oxide (EO).
- the alkylene oxide used as the material of the polyether polyol B may be one type or two or more types.
- the weight average molecular weight Mw of the polyether polyol B contained in the foaming stock solution is preferably 1500 to 4000, more preferably 2000 to 4000.
- the weight average molecular weight Mw is a value calculated as a polystyrene equivalent value by gel permeation chromatography (GPC method).
- the polyether polyol B contained in the foaming stock solution may be one type or two or more types.
- the total content of the polyether polyol is preferably 1% by mass or more, more preferably 10 to 40% by mass, and further preferably 10 to 30% by mass.
- a polymer polyol A ′ may be used in combination as a component different from the polyether polyols A and B.
- the “polymer polyol” generally means a polymer composition or a mixture obtained by polymerizing an ethylenically unsaturated compound in a polyether polyol.
- a polymer polyol widely used for polyurethane foam moldings can be applied.
- a polymer component such as polyacrylonitrile, acrylonitrile-styrene copolymer (AN / ST copolymer) is added to a polyether polyol made of polyalkylene oxide and having a weight average molecular weight Mw of 3000 to 8000, more preferably 4000 to 7000.
- Examples include graft-polymerized polymer polyols.
- the alkylene oxide used as the raw material of the polyalkylene oxide is preferably an alkylene oxide containing propylene oxide (PO) as a functional group (polymerizable group), and an alkylene oxide containing only propylene oxide, or propylene oxide and ethylene oxide (EO). More preferred are alkylene oxides included together.
- the content of the polymer component with respect to the total mass of the polymer polyol A ′ is preferably 10 to 50% by mass.
- the polymer polyol A ′ is a polyol as an optional component not corresponding to the polyether polyols A and B.
- polyol C As polyol C, what functions as a crosslinking agent is preferable.
- the mass ratio is within the above range, the elongation and mechanical strength of the flexible polyurethane foam are appropriately increased.
- the foaming stock solution contains 1 as a crosslinking agent.
- the mass ratio is within the above range, the elongation and mechanical strength of the flexible polyurethane foam are appropriately increased, the feeling of wobbling is reduced, and the softness in the vicinity of the seating surface is increased to provide a comfortable sitting comfort.
- the ethyleneoxy group means a group having a monovalent bond from which one hydrogen atom contained in ethylene oxide is removed.
- the alkyleneoxy group having 3 or 4 carbon atoms means a group having a monovalent bond in which one hydrogen atom contained in propylene oxide or butylene oxide is removed.
- the number of carbon atoms of the alkyleneoxy group possessed by polyol C may be at least any one of 2 to 4.
- the hydroxyl value (unit: mgKOH / g) of polyol C is 200 or more, preferably 240 to 600, more preferably 400 to 600.
- the hydroxyl value of the polyol C is 200 or more, the mechanical strength of the flexible polyurethane foam is appropriately high, and when the hydroxyl value of the polyol C is 600 or less, the elongation of the flexible polyurethane foam is appropriately high. Therefore, if it is in the preferable range, the feeling of wobble is reduced, and a comfortable seat pad can be obtained.
- polystyrene foam As a specific polyol C, a known crosslinking agent used in the field of polyurethane foam can be applied.
- the polyol C contained in the foaming stock solution may be one type or two or more types.
- the total content of the polyol C with respect to the total mass of polyol contained in the foaming stock solution is 0.5 to 15% by mass is preferable, 1 to 10% by mass is more preferable, and 1 to 5% by mass is further preferable.
- the upper limit value of the above range it is possible to obtain moderate foamability and hardness when it is at most the upper limit value of the above range.
- the effect of a crosslinking agent is fully acquired as it is more than the lower limit of the said range.
- the polyisocyanate contained in the foaming stock solution is preferably diphenylmethane diisocyanate having an isocyanate index of 70 to 120, more preferably 80 to 110, and still more preferably 85 to 105.
- MDI Diphenylmethane diisocyanate
- 4,4-MDI 4,4-diphenylmethane diisocyanate
- 2,4-MDI 2,4-diphenylmethane diisocyanate
- 2,2-diphenylmethane diisocyanate 2,2-diphenylmethane diisocyanate
- 2,2-MDI polymeric MDI
- crude MDI crude MDI
- one type of MDI may be contained alone, or two or more types of MDI may be contained.
- the isocyanate index means the percentage of the actual blending amount with respect to the necessary amount calculated by the stoichiometry of the polyisocyanate that reacts with all active hydrogen contained in the polyol or the like in the foaming stock solution.
- the isocyanate index 90 is blended with polyisocyanate equivalent to 90% by mass with respect to the stoichiometrically necessary amount required to react with all active hydrogen contained in the polyol in the foaming stock solution.
- the isocyanate index derived from MDI contained in the foaming stock solution is preferably 70 to 120.
- the foaming stock solution can be easily stirred.
- the isocyanate index is 120 or less, foam collapse can be prevented and a better foam can be easily obtained.
- a small amount of a known polyisocyanate other than MDI may be added in addition to the (DI) MDI.
- TDI tolylene diisocyanate
- triphenyl diisocyanate triphenyl diisocyanate
- xylene diisocyanate polymethylene polyphenylene polyisocyanate
- hexamethylene diisocyanate isophorone diisocyanate and the like can be mentioned.
- the total content of one or more of diphenylmethane diisocyanate with respect to the total mass of polyisocyanate contained in the foaming stock solution is preferably 70% by mass or more, more preferably 80 to 100% by mass, still more preferably 90 to 100% by mass, and most preferably 95 to 100% by mass.
- the foaming agent contained in the foaming stock solution it is preferable to use water. Since water reacts with polyisocyanate to generate carbon dioxide, it functions as a foaming agent.
- the water content in the foaming stock solution is preferably 1 to 7 parts by mass and more preferably 2 to 5 parts by mass with respect to 100 parts by mass of the polyol.
- Catalyst> Examples of the catalyst contained in the foaming stock solution include known catalysts used in the field of polyurethane foam. Known catalysts include amine catalysts and tin catalysts.
- a resinification catalyst accelerates
- a resin catalyst having a ratio of the foaming catalyst constant to the gelation catalyst constant (foaming catalyst constant / gelation catalyst constant) of 1 or less is called a resination catalyst.
- the foaming catalyst promotes foaming rather than resinification.
- a foaming catalyst having a ratio of the foaming catalyst constant to the gelation catalyst constant of more than 1 is called a foaming catalyst.
- the gelation catalyst constant is a constant that determines the speed of the resinification reaction between polyols and polyisocyanates, and the higher the value, the higher the crosslink density of the foam.
- the reaction constant of the gelation reaction between tolylene diisocyanate and diethylene glycol is used.
- the foaming catalyst constant is a constant that determines the speed of the foaming reaction between the polyisocyanates and water, and the larger the value, the higher the cell connectivity of the foam.
- the reaction constant of the foaming reaction between tolylene diisocyanate and water is used.
- the gelation catalyst constant and the foaming catalyst constant are determined by a known method.
- the resinification catalyst examples include triethylenediamine (TEDA), a mixture of triethylenediamine and polypropylene glycol, N, N, N ′, N′-tetramethylethylenediamine, N, N, N ′, N′-tetramethylpropylene.
- TAA triethylenediamine
- polypropylene glycol N, N, N ′, N′-tetramethylethylenediamine, N, N, N ′, N′-tetramethylpropylene.
- foaming catalyst examples include bis (2-dimethylaminoethyl) ether, N, N, N ′, N ′′, N ′′ -pentamethyldiethylenetriamine, N, N, N ′, N ′′, N ′ ′′, N ′ ′′ -hexamethyltriethylenetetramine, etc.
- a tertiary amine catalyst is preferred.
- the foaming stock solution contains at least a resination catalyst as a catalyst among a resination catalyst and a foaming catalyst.
- the mass ratio of resinization catalyst: foaming catalyst contained in the foaming stock solution is preferably from 100: 0 to 100: 100, more preferably from 100: 0 to 100: 50, further preferably from 100: 0 to 100: 20. preferable.
- the content of the amine-based catalyst in the foaming stock solution is preferably 0.1 to 5.0 parts by mass, and 0.3 to 3.0 parts by mass with respect to 100 parts by mass of the polyol. More preferred is 0.5 to 2.0 parts by mass.
- foam collapse can be prevented.
- a moderate reactivity can be obtained when it is not more than the upper limit of the above range. As a result, a flexible polyurethane foam having excellent mechanical properties can be obtained.
- the content of the tin catalyst in the foaming stock solution is preferably 0.001 to 1 part by mass with respect to 100 parts by mass of the polyol.
- the foaming stock solution may contain a foam stabilizer.
- foam stabilizer known foam stabilizers used in the field of polyurethane foam are applicable, and examples thereof include silicone foam stabilizers, anionic foam stabilizers, and cationic foam stabilizers. These foam stabilizers may include a foam stabilizer having a hydroxyl group at the molecular chain terminal.
- the content of the foam stabilizer in the foaming stock solution is preferably 0.1 to 5 parts by mass, more preferably 0.5 to 3 parts by mass, and 0.7 to 2 parts by mass with respect to 100 parts by mass of the polyol. Further preferred. Usually, the effect as a foam stabilizer is sufficiently obtained at a content of 5 parts by mass or less. Moreover, the stirring rate of a polyol and polyisocyanate improves that it is a content rate of 0.1 mass part or more, and the flexible polyurethane foam which has a desired physical property is easy to be obtained.
- additives may be added to the foaming stock solution as necessary.
- coloring agents such as pigments, chain extenders, fillers such as calcium carbonate, flame retardants, antioxidants, UV absorbers, light stabilizers, conductive materials such as carbon black, antibacterial agents, etc. it can.
- the compounding quantity of various additives is suitably adjusted according to a use and the objective.
- the method for preparing the foaming stock solution is not particularly limited.
- the mixture of remaining raw materials excluding polyisocyanate hereinafter, abbreviated as “polyol mixture” in some cases.
- polyol mixture the mixture of remaining raw materials excluding polyisocyanate
- polyisocyanate the mixture of remaining raw materials excluding polyisocyanate (hereinafter, abbreviated as “polyol mixture” in some cases).
- polyol mixture in some cases.
- the polyol mixture may be prepared by a known method. Thereafter, in the step of foam-molding the flexible polyurethane foam, the polyol mixture and polyisocyanate may be mixed.
- the viscosity of the prepared polyol mixture at a liquid temperature of 25 ° C. is preferably 4,000 mPa ⁇ s or less, and more preferably 3,000 mPa ⁇ s or less.
- the stirring efficiency of the foaming stock solution is improved, and a sufficient amount of foaming is obtained uniformly throughout the foaming stock solution, thereby obtaining a flexible polyurethane foam (foamed molded product) having desired physical properties. It becomes easy to be done.
- a method for foam-molding a flexible polyurethane foam using the foaming stock solution is not particularly limited.
- a known method for foaming by injecting a foaming stock solution into a cavity formed in a mold can be applied. .
- the liquid temperature of the foaming stock solution to be injected is preferably 10 to 50 ° C.
- the temperature of the mold is preferably 40 to 80 ° C.
- appropriate foaming is easily obtained.
- the polyol component and the polyisocyanate component are polymerized to form a polyurethane, and the polyurethane is cured as the polymerization proceeds. Thereafter, the desired flexible polyurethane foam is obtained by demolding.
- the flexible polyurethane foam obtained here may be further subjected to a known film removal treatment.
- the “soft” of the flexible polyurethane foam according to the present invention has a hardness (rigidity) to the extent that the flexible polyurethane foam is deformed and dented when it is pushed by hand or sitting on it. Means.
- the flexible polyurethane foam according to the present invention preferably has the following rigidity distribution.
- the following stiffness distribution is a physical property in a direction along the seating surface (a direction perpendicular to the vertical direction from the surface layer to the depth direction) when the flexible polyurethane foam is used as a pad for a sheet.
- the value (unit:%) is preferably more than 90, more preferably 100 or more.
- the value (unit: kPa) is preferably more than 97, more preferably 100 or more.
- the value (unit: N / cm) is preferably more than 5.3, more preferably 5.5 or more.
- the flexible polyurethane foam according to the present invention gradually increases in rigidity (hardness) in the thickness direction from the lower layer to the upper layer during foam molding (that is, the upward direction along the vertical line).
- the rigidity distribution in the thickness direction of the flexible polyurethane foam according to the present invention shows a continuous increasing tendency or a decreasing tendency.
- the rigidity distribution tends to increase when viewed from the lower layer to the upper layer during foam molding of flexible polyurethane foam, but when the same flexible polyurethane foam is viewed from the upper layer to the lower layer during foam molding, the rigidity distribution The distribution shows a decreasing trend.
- the combination of the respective components constituting the foaming stock solution is a factor.
- the major factors are that the polyether polyol B having a functional group number of 2 and Mw of 1000 to 4000 is contained, and that MDI is contained as a major part of the polyisocyanate and that TDI is little or not contained. .
- the resinification catalyst contained as a catalyst component contributes to the above rigidity distribution.
- Example 1 Comparative Example 1
- a mixed liquid containing components other than polyisocyanate and polyisocyanate were mixed to prepare a foaming stock solution.
- the unit of the numerical value of the raw material is part by mass.
- Example 12 the case where PPG-4 was used was shown.
- Example 13 the case where EO and PO were mixed as a cross-linking agent and the amount of EO was large was shown.
- Example 14 the case where a crosslinking agent 3 having a molecular weight of 600 (EO 100%) was used was shown.
- a sheet pad was manufactured by injecting this foaming stock solution into a mold and performing foam molding. About the obtained pad for sheets, performance was evaluated with the following measuring method. The results are also shown in Table 1.
- PPG-1 is the above-mentioned polyether polyol A, which is Sannix FA921 (manufactured by Sanyo Chemical Industries, Ltd.), which has a functional group number of 3, a weight average molecular weight of 6000, and an EO-terminated polyol.
- PPG-2 is the polyether polyol B, having a functional group number of 2, a weight average molecular weight of 2000, and an EO / PO mass ratio of 0/100.
- PPG-3 is the polyether polyol B, having a functional group number of 2, a weight average molecular weight of 4000, and an EO / PO mass ratio of 0/100.
- PPG-4 is the polyether polyol B, having a functional group number of 2, a weight average molecular weight of 1000, and an EO / PO mass ratio of 0/100.
- POP is the polymer polyol A ′ and is KC855 (manufactured by Sanyo Chemical Industries, Ltd.).
- Crosslinking agent 1 is the polyol C, and is a polyether polyol (EO 100 mass%) having a functional group number of 4, a weight average molecular weight of 400, and a hydroxyl value of 561 mgKOH / g.
- Crosslinking agent 2 is the polyol C, which is a polyether polyol (PO 100 mass%) having 3 functional groups, a weight average molecular weight of 400, and a hydroxyl value of 420 mgKOH / g.
- Crosslinking agent 3 is the polyol C, which is a polyether polyol (100 mass% of EO) having 4 functional groups and a weight average molecular weight of 600.
- the “catalyst” is a mixture of triethylenediamine (TEDA) (33% by mass) and dipropylene glycol (DPG) (67% by mass) (product name: DABCO 33LV, manufactured by Air Products).
- the “foam stabilizer” is a silicone foam stabilizer (manufactured by Momentive Performance Materials, trade name: Niax silicone L3627).
- the “foaming agent” is water.
- the “polyisocyanate” is an MDI-based isocyanate (manufactured by Sumika Covestrourethane Co., Ltd., trade name: J-243) and does not substantially contain a TDI-based isocyanate.
- the NCO% of J-243 is 31.5%.
- ⁇ Measuring method of mechanical properties The measurement of elongation, tensile strength, and tear strength was performed according to Japanese Industrial Standard JIS K 6400-5: 2012.
- the physical property value measured here is a physical property value in the horizontal direction of the sheet pad (direction perpendicular to the vertical direction from the surface layer to the depth direction).
- Examples 1 to 14 containing polyether polyol B exhibited an elongation of 100% or more, a tensile strength of 100 kPa or more, and a tear strength of 5.5 N / cm or more. From these results, it is clear that the sheet pads of Examples 1 to 14 have better mechanical properties than Comparative Example 1. In addition, it was confirmed that the sheet pads of Examples 6 to 10 using the PO-based crosslinking agent have mechanical properties superior to the sheet pads of Examples 1 to 5 using the EO-based crosslinking agent. . On the other hand, it was found that Examples 1 to 5 using the EO-based crosslinking agent have excellent mechanical properties and increase the softness in the vicinity of the seating surface as will be described later.
- the hardness in the thickness direction from the front surface to the back surface of the flexible polyurethane foams of Comparative Example 1 and Examples 1 to 14 continuously increases. That is, the rigidity distribution in the thickness direction shows a continuous increasing tendency. This increasing tendency indicates that there is less wobble feeling. Further, since the hardness ratio in the vicinity of the surface is relatively small, the repulsive force at the time of sitting is moderate, and the feeling of pressure from the seating surface is small.
- the flexible polyurethane foam according to the present invention can be widely used as a vehicle seat pad. According to the present invention, it is possible to provide a seat pad having excellent mechanical properties and less wobbling at the time of sitting, and a flexible polyurethane foam forming the seat pad.
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Abstract
Description
本願は、2015年12月16日に日本に出願された特願2015-245707号に基づき優先権を主張し、その内容をここに援用する。
[2] 前記ポリオールは、水酸基価が200mgKOH/g以上であり、炭素数2~4のアルキレンオキシ基を有し、[エチレンオキシ基]:[炭素数3又は4のアルキレンオキシ基](質量比)が100:0~60:40であるポリオールCを含む上記[1]に記載の軟質ポリウレタンフォーム。
[3] 前記軟質ポリウレタンフォームの厚み方向の剛性分布が、連続的な増加傾向又は減少傾向を示す上記[1]又は[2]の何れか一項に記載の軟質ポリウレタンフォーム。
[4] 上記[1]~[3]の何れか一項に記載の軟質ポリウレタンフォームを備えるシート用パッド。
本発明の軟質ポリウレタンフォームは、ポリオール、ポリイソシアネート、発泡剤、及び触媒を含有する発泡原液を発泡成形して得られる軟質ポリウレタンフォームであり、下記(i)~(iii)を満たす。
(i)前記ポリオールは、重量平均分子量Mwが3000~8000であり且つ官能基数が3~4であるポリエーテルポリオールAを含む。
(ii)前記ポリオールは、重量平均分子量Mwが1000~4000であり且つ官能基数が2であるポリエーテルポリオールBを含む。
(iii)前記ポリイソシアネートは、ジフェニルメタンジイソシアネート(MDI)を含む。
(iv)前記ポリオールは、水酸基価が200mgKOH/g以上であり、炭素数2~4のアルキレンオキシ基を有し、[エチレンオキシ基]:[炭素数3又は4のアルキレンオキシ基](質量比)が100:0~60:40であるポリオールCを含むことが好ましい。
(ポリエーテルポリオールA)
前記発泡原液に含まれるポリエーテルポリオールAは、重量平均分子量Mwが3000~8000であり、且つ官能基数(ヒドロキシ基の数)が3~4であるポリエーテルポリオールである。ポリエーテルポリオールAとしては、反応性が良好であることから、アルキレンオキシドの開環重合により得られるポリエーテルポリオールが好ましい。
アルキレンオキシドとしては、プロピレンオキシド(PO)、エチレンオキシド(EO)等が挙げられる。ポリエーテルポリオールAの材料として使用されるアルキレンオキシドは1種類であってもよいし、2種類以上であってもよい。
なお、重量平均分子量Mwは、ゲルパーミエーションクロマトグラフィー(GPC法)によってポリスチレン換算値として算出した値である。
前記発泡原液に含まれるポリエーテルポリオールBは、重量平均分子量Mwが1000~4000であり、且つ官能基数(ヒドロキシ基の数)が2であるポリエーテルポリオールである。ポリエーテルポリオールBとしては、反応性が良好であることから、アルキレンオキシドの開環重合により得られるポリエーテルポリオールが好ましい。
アルキレンオキシドとしては、プロピレンオキシド(PO)、エチレンオキシド(EO)等が挙げられる。ポリエーテルポリオールBの材料として使用されるアルキレンオキシドは1種類であってもよいし、2種類以上であってもよい。
なお、重量平均分子量Mwは、ゲルパーミエーションクロマトグラフィー(GPC法)によってポリスチレン換算値として算出した値である。
なお、前記ポリマーポリオールA’は、前記ポリエーテルポリオールA,Bに該当しない任意成分としてのポリオールである。
ポリオールCとしては、架橋剤として機能するものが好ましい。
前記発泡原液に架橋剤として含有される1種又は2種以上のポリオールCの全体が有する[EO基]と[炭素数3又は4のアルキレンオキシ基](C3,4基)の質量比は、EO基:(C3,4基)=40:60~0:100が好ましく、15:85~0:100がより好ましく、10:90~0:100がさらに好ましく、5:95~0:100が特に好ましい。上記質量比の範囲であると、軟質ポリウレタンフォームの伸び及び機械的強度が適度に高くなる。
なお、ポリオールCが有する前記アルキレンオキシ基の炭素数は、2~4のうち少なくとも何れか1つであればよい。
ポリオールCの水酸基価が200以上であると、軟質ポリウレタンフォームの機械的強度が適度に高くなり、ポリオールCの水酸基価が600以下であると、軟質ポリウレタンフォームの伸びが適度に高くなる。従って、上記好適な範囲であると、ぐらつき感が少なくなり、快適な座り心地のシート用パッドが得られる。
なお、架橋剤の水酸基価は、(水酸基価=56100÷重量平均分子量×官能基数)の計算式で算出される。
前記発泡原液に含まれるポリオールCは1種類であってもよいし、2種類以上であってもよい。
前記発泡原液に含まれるポリイソシアネートとして、ジフェニルメタンジイソシアネートをイソシアネートインデックスで70~120が好ましく、80~110がより好ましく、85~105がさらに好ましい。
前記発泡原液において、1種類のMDIが単独で含有されてもよいし、2種類以上のMDIが含有されてもよい。
前記発泡原液に含まれる発泡剤としては、水を用いることが好ましい。水はポリイソシアネートと反応して炭酸ガスを発生するため、発泡剤として機能する。
前記発泡原液中の水の含有量としては、ポリオール100質量部に対して、1~7質量部であることが好ましく、2~5質量部であることがより好ましい。上記範囲であると、所望の物性を有する軟質ポリウレタンフォームが容易に得られる。また、得られた軟質ポリウレタンフォームの熱圧縮残留歪み特性が劣化することを防止できる。
前記発泡原液に含まれる触媒としては、ポリウレタンフォームの分野で使用される公知の触媒が挙げられる。公知の触媒としては、アミン系触媒、スズ触媒が挙げられる。
樹脂化触媒は、ポリオールとポリイソシアネートとの反応を促進し、ウレタン結合生成を促進するものである。ゲル化触媒定数に対する泡化触媒定数の比(泡化触媒定数/ゲル化触媒定数)が1以下であるものが樹脂化触媒と呼ばれる。
泡化触媒は、樹脂化よりも発泡を促進するものである。ゲル化触媒定数に対する泡化触媒定数の比が1を超えるものが泡化触媒と呼ばれる。
ここで、ゲル化触媒定数は、ポリオール類とポリイソシアネート類との樹脂化反応の速度を決定する定数であり、その値が大きくなると発泡体の架橋密度が高くなる。具体的には、トリレンジイソシアネートとジエチレングリコールとのゲル化反応の反応定数が用いられる。一方、泡化触媒定数は、ポリイソシアネート類と水との泡化反応の速度を決定する定数であり、その値が大きくなると発泡体のセルの連通性が高められる。具体的には、トリレンジイソシアネートと水との泡化反応の反応定数が用いられる。
ゲル化触媒定数及び泡化触媒定数は公知方法により決定される。
前記発泡原液に含有される、樹脂化触媒:泡化触媒の質量比は、100:0~100:100が好ましく、100:0~100:50がより好ましく、100:0~100:20がさらに好ましい。
上記範囲の下限値以上であるとフォームの崩壊を防止できる。上記範囲の上限値以下であると適度な反応性が得られる。この結果、機械的性質が優れた軟質ポリウレタンフォームが得られる。
前記発泡原液には、整泡剤が含まれてもよい。整泡剤としては、ポリウレタンフォームの分野で使用される公知の整泡剤が適用可能であり、例えば、シリコーン系整泡剤、アニオン系整泡剤、カチオン系整泡剤が挙げられる。これらの整泡剤には、分子鎖末端に水酸基を有する整泡剤が含まれてもよい。
前記発泡原液には、必要に応じて各種添加剤を配合することができる。例えば、顔料等の着色剤、鎖延長剤、炭酸カルシウム等の充填材、難燃剤、酸化防止剤、紫外線吸収剤、光安定剤、カーボンブラック等の導電性物質、抗菌剤などを配合することができる。各種添加剤の配合量は、用途や目的に応じて適宜調整される。
前記発泡原液の調製方法は、特に限定されず、例えば、ポリイソシアネートを除いた、残りの各原料からなる混合物(以下、「ポリオール混合物」と略記することがある。
)を調製し、その後、ポリイソシアネートと混合して、発泡原液を得る調製方法が挙げられる。
発泡成形の方法によらず、本発明にかかる軟質ポリウレタンフォームは、発泡成形時の下層から上層へ向かう厚み方向(すなわち鉛直線に沿う上向きの方向)に向かって、徐々に剛性(硬度)が高まる傾向にある。つまり、本発明にかかる軟質ポリウレタンフォームの厚み方向の剛性分布が、連続的な増加傾向又は減少傾向を示す。ここで、軟質ポリウレタンフォームの発泡成形時の下層から上層へ向かう方向に見るとその剛性分布は増加傾向を示すが、同じ軟質ポリウレタンフォームを発泡成形時の上層から下層へ向かう方向に見るとその剛性分布は減少傾向を示す。
表1に示す配合で、ポリイソシアネート以外の成分を含む混合液と、ポリイソシアネートとを混合して、発泡原液を調製した。表中、原料の数値の単位は質量部である。
実施例12として、PPG-4を用いた場合を示した。
実施例13として、架橋剤としてEOとPOを混合し、且つEOが多い場合を示した。
実施例14として、分子量600の架橋剤3(EO100%)を用いた場合を示した。
この発泡原液を金型に注入して発泡成形することにより、シート用パッドを製造した。得られたシート用パッドについて、下記の測定方法により性能を評価した。この結果を表1に併記する。
「PPG-1」は、前記ポリエーテルポリオールAであり、官能基数3、重量平均分子量6000、EO末端ポリオールであるサンニックスFA921(三洋化成工業株式会社製)である。
「PPG-2」は、前記ポリエーテルポリオールBであり、官能基数2、重量平均分子量2000、EO/PO質量比=0/100である。
「PPG-3」は、前記ポリエーテルポリオールBであり、官能基数2、重量平均分子量4000、EO/PO質量比=0/100である。
「PPG-4」は、前記ポリエーテルポリオールBであり、官能基数2、重量平均分子量1000、EO/PO質量比=0/100である。
「POP」は、前記ポリマーポリオールA’であり、KC855(三洋化成工業株式会社製)である。
「架橋剤1」は、前記ポリオールCであり、官能基数4、重量平均分子量400、水酸基価561mgKOH/gのポリエーテルポリオール(EO100質量%)である。
「架橋剤2」は、前記ポリオールCであり、官能基数3、重量平均分子量400、水酸基価420mgKOH/gのポリエーテルポリオール(PO100質量%)である。
「架橋剤3」は、前記ポリオールCであり、官能基数4、重量平均分子量600、のポリエーテルポリオール(EO100質量%)である。
「触媒」は、トリエチレンジアミン(TEDA)(33質量%)とジプロピレングリコール(DPG)(67質量%)の混合物(エアープロダクツ社製、商品名:ダブコ(DABCO)33LV)である。
「整泡剤」は、シリコーン系整泡剤(モメンティブ・パフォーマンス・マテリアルズ社製、商品名:Niax silicone L3627)である。
「発泡剤」は、水である。
「ポリイソシアネート」は、MDI系のイソシアネート(住化コベストロウレタン社製、商品名:J-243)であり、TDI系のイソシアネートは実質的に含まれない。J-243のNCO%は31.5%である。
伸び、引張強度、引裂き強度の測定は、日本工業規格JIS K 6400-5:2012に従って行った。ここで測定した物性値は、シート用パッドの水平方向(表層から深さ方向へ向かう鉛直方向に対して直交する方向)の物性値である。
ポリエーテルポリオールBを含有する実施例1~14は、100%以上の伸びを示し、100kPa以上の引張強度を有し、5.5N/cm以上の引裂き強度を有していた。これらの結果から、実施例1~14のシート用パッドは、比較例1よりも優れた機械的性質を有することが明らかである。
また、PO系架橋剤を用いた実施例6~10のシート用パッドは、EO系架橋剤を用いた実施例1~5のシート用パッドよりも優れた機械的性質を有することが確認された。
一方、EO系架橋剤を用いた実施例1~5は、優れた機械的性質を有するとともに、後述するように、座面付近の柔らかさが増すことが分かった。
軟質ポリウレタンフォームの発泡成形時の上下の向きを反転させ、発泡成形時の下面を表面と見て、発泡成形時の上面を裏面と見る。軟質ポリウレタンフォームをシート用パッドとして使用する場合、シート用パッドの座面に対応する前記表面側が柔らかく、座面と反対側の前記裏面側が硬い構成であると、快適な座り心地が得られ易い。
上記で測定した、表面からの深さ位置が異なる4箇所の硬度の測定値の平均を算出して、その平均値に対する各箇所の硬度比を算出した。この硬度比は、発泡成形体の厚み方向の平均的な硬度に対する各箇所(各深さ位置)の硬度の比を意味する。これらの結果を表1に併記する。
Claims (4)
- ポリオール、ポリイソシアネート、発泡剤、及び触媒を含有する発泡原液を発泡成形して得られる軟質ポリウレタンフォームであって、
前記ポリオールは、重量平均分子量Mwが3000~8000であり且つ官能基数が3~4であるポリエーテルポリオールAと、
重量平均分子量Mwが1000~4000であり且つ官能基数が2であるポリエーテルポリオールBと、を含み、
前記ポリイソシアネートは、ジフェニルメタンジイソシアネートを含む軟質ポリウレタンフォーム。 - 前記ポリオールは、水酸基価が200mgKOH/g以上であり、炭素数2~4のアルキレンオキシ基を有し、[エチレンオキシ基]:[炭素数3又は4のアルキレンオキシ基](質量比)が100:0~60:40であるポリオールCを含む請求項1に記載の軟質ポリウレタンフォーム。
- 前記軟質ポリウレタンフォームの厚み方向の剛性分布が、連続的な増加傾向又は減少傾向を示す請求項1又は2に記載の軟質ポリウレタンフォーム。
- 請求項1~3の何れか一項に記載の軟質ポリウレタンフォームを備えるシート用パッド。
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| US15/779,946 US20180345838A1 (en) | 2015-12-16 | 2016-12-12 | Soft polyurethane foam and seat pad |
| CN201680073152.1A CN108368228A (zh) | 2015-12-16 | 2016-12-12 | 软质聚氨酯泡沫和座垫 |
| JP2017556037A JPWO2017104600A1 (ja) | 2015-12-16 | 2016-12-12 | 軟質ポリウレタンフォーム、及びシート用パッド |
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| JP2023032016A (ja) * | 2021-08-26 | 2023-03-09 | 東ソー株式会社 | ポリアルキレンオキシド組成物、およびそれを用いた建築材料 |
| KR102691261B1 (ko) * | 2023-06-14 | 2024-08-05 | 주식회사 람스타일컴퍼니 | 허리 지지력이 우수한 폼의 제조방법 |
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| JP6741420B2 (ja) * | 2015-12-16 | 2020-08-19 | 株式会社ブリヂストン | 乗り物のシート用パッド形成用軟質ポリウレタンフォーム、及び乗り物のシート用パッド |
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| JPWO2017104600A1 (ja) | 2018-10-04 |
| CN108368228A (zh) | 2018-08-03 |
| EP3392282A1 (en) | 2018-10-24 |
| EP3392282A4 (en) | 2018-10-24 |
| US20180345838A1 (en) | 2018-12-06 |
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