WO2019009352A1 - 樹脂発泡体、樹脂発泡体シート、粘着テープ、車両用部材及び建築部材 - Google Patents
樹脂発泡体、樹脂発泡体シート、粘着テープ、車両用部材及び建築部材 Download PDFInfo
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- WO2019009352A1 WO2019009352A1 PCT/JP2018/025476 JP2018025476W WO2019009352A1 WO 2019009352 A1 WO2019009352 A1 WO 2019009352A1 JP 2018025476 W JP2018025476 W JP 2018025476W WO 2019009352 A1 WO2019009352 A1 WO 2019009352A1
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- C—CHEMISTRY; METALLURGY
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- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
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- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/0014—Use of organic additives
- C08J9/0023—Use of organic additives containing oxygen
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- 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
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- 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
- C08J9/06—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 chemical blowing agent
- C08J9/10—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 chemical blowing agent developing nitrogen, the blowing agent being a compound containing a nitrogen-to-nitrogen bond
- C08J9/102—Azo-compounds
- C08J9/103—Azodicarbonamide
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- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/22—After-treatment of expandable particles; Forming foamed products
- C08J9/228—Forming foamed products
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/0008—Organic ingredients according to more than one of the "one dot" groups of C08K5/01 - C08K5/59
- C08K5/0025—Crosslinking or vulcanising agents; including accelerators
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/10—Esters; Ether-esters
- C08K5/101—Esters; Ether-esters of monocarboxylic acids
- C08K5/103—Esters; Ether-esters of monocarboxylic acids with polyalcohols
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/10—Esters; Ether-esters
- C08K5/12—Esters; Ether-esters of cyclic polycarboxylic acids
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/20—Adhesives in the form of films or foils characterised by their carriers
- C09J7/22—Plastics; Metallised plastics
- C09J7/24—Plastics; Metallised plastics based on macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
- C09J7/245—Vinyl resins, e.g. polyvinyl chloride [PVC]
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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- C09J7/00—Adhesives in the form of films or foils
- C09J7/20—Adhesives in the form of films or foils characterised by their carriers
- C09J7/22—Plastics; Metallised plastics
- C09J7/26—Porous or cellular plastics
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- C08J2201/00—Foams characterised by the foaming process
- C08J2201/02—Foams characterised by the foaming process characterised by mechanical pre- or post-treatments
- C08J2201/03—Extrusion of the foamable blend
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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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- 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
- C08J2207/00—Foams characterised by their intended use
- C08J2207/02—Adhesive
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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
- C08J2300/00—Characterised by the use of unspecified polymers
- C08J2300/22—Thermoplastic resins
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- 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
- C08J2329/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal, or ketal radical; Hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Derivatives of such polymer
- C08J2329/14—Homopolymers or copolymers of acetals or ketals obtained by polymerisation of unsaturated acetals or ketals or by after-treatment of polymers of unsaturated alcohols
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- 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
- C08J2331/00—Characterised by the use of copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an acyloxy radical of a saturated carboxylic acid, or carbonic acid, or of a haloformic acid
- C08J2331/02—Characterised by the use of omopolymers or copolymers of esters of monocarboxylic acids
- C08J2331/04—Homopolymers or copolymers of vinyl acetate
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- C09J2203/00—Applications of adhesives in processes or use of adhesives in the form of films or foils
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- C09J2203/00—Applications of adhesives in processes or use of adhesives in the form of films or foils
- C09J2203/346—Applications of adhesives in processes or use of adhesives in the form of films or foils for building applications e.g. wrap foil
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- C09J2203/00—Applications of adhesives in processes or use of adhesives in the form of films or foils
- C09J2203/354—Applications of adhesives in processes or use of adhesives in the form of films or foils for automotive applications
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- C09J2301/00—Additional features of adhesives in the form of films or foils
- C09J2301/30—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier
- C09J2301/312—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier parameters being the characterizing feature
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- C09J2301/00—Additional features of adhesives in the form of films or foils
- C09J2301/40—Additional features of adhesives in the form of films or foils characterized by the presence of essential components
- C09J2301/41—Additional features of adhesives in the form of films or foils characterized by the presence of essential components additives as essential feature of the carrier layer
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- C09J2400/00—Presence of inorganic and organic materials
- C09J2400/20—Presence of organic materials
- C09J2400/24—Presence of a foam
- C09J2400/243—Presence of a foam in the substrate
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- C09J2431/00—Presence of polyvinyl acetate
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- C09J2459/00—Presence of polyacetal
- C09J2459/006—Presence of polyacetal in the substrate
Definitions
- the present invention relates to a resin foam, a resin foam sheet, an adhesive tape, a member for vehicles, and a building member capable of exhibiting extremely high sound insulation performance.
- a sound insulation material installed in a sound transmission path to block sound transmission to block sound and sound is a member for vehicles such as cars, aircrafts and ships, building members, electronic parts, living members such as carpet backings, home It is used for all kinds of applications such as industrial and business electrical products.
- a sound insulation material a foam made of a resin or the like, a non-woven fabric, a gel-like substance or the like is generally used.
- the resin foam can be exhibited in various fields because it can exhibit excellent sound insulation performance and is excellent in handleability (Patent Document 1 and the like).
- An object of the present invention is to provide a resin foam, a resin foam sheet, an adhesive tape, a member for vehicles, and a building member which can exhibit extremely high sound insulation performance in view of the above-mentioned present situation.
- the present invention 1 is a resin foam containing a thermoplastic resin and a plasticizer and having a large number of cells, and is a primary antireflective resin in the range of 20 to 60 ° C. measured by mechanical impedance measurement (MIM) according to JIS G0602. It is a resin foam wherein the minimum value of the loss factor of the resonance frequency is 0.05 or more and the secondary antiresonance frequency in the range of 20 to 60 ° C. is 300 to 800 Hz.
- MIM mechanical impedance measurement
- the present invention 2 is a resin foam containing a thermoplastic resin and a plasticizer and having a large number of cells, and is a primary antireflective resin in the range of 20 to 60 ° C. measured by mechanical impedance measurement (MIM) according to JIS K 7391. It is a resin foam wherein the minimum value of the loss factor of the resonance frequency is 0.005 or more and the secondary antiresonance frequency in the range of 20 to 60 ° C. is 300 to 800 Hz.
- the present invention 3 is a resin foam containing a thermoplastic resin and a plasticizer and having a large number of cells, and is a primary antifoam in the range of 0 to 50 ° C. measured by mechanical impedance measurement (MIM) according to ISO 16940.
- the resin foam is such a resin foam that the maximum value of the loss coefficient of the resonance frequency is 0.20 or more and the secondary antiresonance frequency in the range of 0 to 30 ° C. is 800 Hz or less.
- the resin foam of the present invention 1, the present invention 2 and the present invention 3 (hereinafter, the matters common to the present invention 1, the present invention 2 and the present invention 3 are simply referred to as "the present invention") is a thermoplastic resin. And a plasticizer.
- the thermoplastic resin include polyvinylidene fluoride, polytetrafluoroethylene, vinylidene fluoride-hexafluoropropylene copolymer, polytetrafluoroethylene, acrylonitrile-butadiene-styrene copolymer, polyester, polyether, Examples thereof include polyamide, polycarbonate, polyacrylate, polymethacrylate, polyvinyl chloride, polyethylene, polypropylene, polystyrene, polyvinyl acetal, ethylene-vinyl acetate copolymer and the like.
- polyvinyl acetal or ethylene-vinyl acetate copolymer is preferable, and polyvinyl acetal is more preferable.
- Polyvinyl acetal is widely used as a raw material of an intermediate film for laminated glass. At the time of manufacturing laminated glass, when laminating the interlayer film for laminated glass with glass, the interlayer film for laminated glass remaining at the end is cut, and a large amount of interlayer film for laminated glass is discarded. In the present invention, it is extremely significant also from the viewpoint of recycling etc. if waste of the intermediate film for laminated glass generated in large quantity is used as a raw material.
- the polyvinyl acetal is not particularly limited as long as it is a polyvinyl acetal obtained by acetalizing polyvinyl alcohol with an aldehyde, but polyvinyl butyral is preferable. Moreover, you may use together 2 or more types of polyvinyl acetals as needed.
- the lower limit of the degree of acetalization of the polyvinyl acetal is preferably 40 mol%, preferably 85 mol%, more preferably 60 mol%, and still more preferably 75 mol%.
- a preferable lower limit of the amount of hydroxyl groups is 15 mol%, and a preferable upper limit is 40 mol%.
- the degree of acetalization and the amount of hydroxyl groups can be measured, for example, in accordance with JIS K 6728 "Polyvinyl butyral test method".
- the polyvinyl acetal can be prepared by acetalizing polyvinyl alcohol with an aldehyde.
- the polyvinyl alcohol is generally obtained by saponifying polyvinyl acetate, and polyvinyl alcohol having a degree of saponification of 70 to 99.8 mol% is generally used.
- the saponification degree of the polyvinyl alcohol is preferably 80 to 99.8 mol%.
- the preferable lower limit of the polymerization degree of the polyvinyl alcohol is 500, and the preferable upper limit is 4000.
- the degree of polymerization of the polyvinyl alcohol is 500 or more, the handleability of the resulting resin foam is excellent.
- the degree of polymerization of the polyvinyl alcohol is 4,000 or less, molding of the resin foam becomes easy.
- the more preferable lower limit of the polymerization degree of the polyvinyl alcohol is 1000, and the more preferable upper limit is 3600.
- the aldehyde is not particularly limited, but generally, aldehydes having 1 to 10 carbon atoms are preferably used.
- the above-mentioned aldehyde having 1 to 10 carbon atoms is not particularly limited.
- aldehydes may be used alone or in combination of two or more. Among them, aldehydes having 2 to 10 carbon atoms are preferable, and n-butyraldehyde, n-hexylaldehyde and n-valeraldehyde are more preferable, from the viewpoint of easily designing a high loss coefficient of a resin foam to be obtained. Particularly preferred is n-butyraldehyde.
- the plasticizer is not particularly limited, and examples thereof include organic ester plasticizers such as monobasic organic acid esters and polybasic organic acid esters, phosphoric acid plasticizers such as organic phosphoric acid plasticizers and organic phosphorous acid plasticizers, etc. Can be mentioned.
- the plasticizer is preferably a liquid plasticizer.
- the said monobasic organic acid ester is not specifically limited,
- the glycol ester etc. which were obtained by reaction of a glycol and a monobasic organic acid are mentioned.
- the glycol include triethylene glycol, tetraethylene glycol, tripropylene glycol and the like.
- the monobasic organic acids include butyric acid, isobutyric acid, caproic acid, 2-ethylbutyric acid, heptylic acid, n-octylic acid, 2-ethylhexylic acid, pelargonic acid (n-nonylic acid), decylic acid and the like. It can be mentioned.
- triethylene glycol dicaproic acid ester triethylene glycol di-2-ethylbutyric acid ester, triethylene glycol di-n-octylic acid ester, triethylene glycol di-2-ethylhexylic acid ester and the like are preferable.
- polybasic organic acid ester is not particularly limited, for example, an ester compound of a polybasic organic acid such as adipic acid, sebacic acid, azelaic acid and an alcohol having a linear or branched structure having 4 to 8 carbon atoms Can be mentioned. Among them, dibutyl sebacate, dioctyl azelate, dibutyl carbitol adipate and the like are preferable.
- the organic ester plasticizer is not particularly limited, and triethylene glycol di-2-ethyl butyrate, triethylene glycol di-2-ethyl hexanoate, triethylene glycol dicaprylate, triethylene glycol di-n-octanoate, Triethylene glycol di-n-heptanoate, tetraethylene glycol di-n-heptanoate, tetraethylene glycol di-2-ethylhexanoate, dibutyl sebacate, dioctyl azelate, dibutyl carbitol adipate, ethylene glycol di-2-ethyl Butyrate, 1,3-propylene glycol di-2-ethyl butyrate, 1,4-butylene glycol di-2-ethyl butyrate, diethylene glycol di-2-ethyl butyrate, diethylene glycol di- -Ethylhexanoate, dipropylene glycol di-2-ethyl butyrate
- the organic phosphoric acid plasticizer is not particularly limited, and examples thereof include tributoxyethyl phosphate, isodecyl phenyl phosphate, triisopropyl phosphate and the like.
- the content of the plasticizer in the resin foam of the present invention is not particularly limited, but a preferable lower limit is 5 parts by weight and a preferable upper limit is 60 parts by weight with respect to 100 parts by weight of the thermoplastic resin. When the content of the plasticizer is in this range, particularly high sound insulation can be exhibited, and the plasticizer does not bleed out from the resin foam. A more preferable lower limit of the content of the plasticizer is 20 parts by weight, and a more preferable upper limit is 55 parts by weight. In many interlayer films for laminated glass, since the content of the plasticizer is about 20 to 55 parts by weight with respect to 100 parts by weight of polyvinyl acetal, the interlayer film for laminated glass discarded is used as it is for resin foaming of the present invention. It can be used as a raw material of the body.
- the resin foam of the present invention preferably further contains an adhesive.
- the resin foam of the present invention can exhibit adhesiveness and handleability is improved.
- the pressure-sensitive adhesive is not particularly limited, and examples thereof include known pressure-sensitive adhesives such as acrylic pressure-sensitive adhesives, urethane pressure-sensitive adhesives and rubber pressure-sensitive adhesives.
- the resin foam of the present invention includes, in addition to the thermoplastic resin and the plasticizer, additives such as, for example, an adhesive regulator, a heat ray absorbent, an ultraviolet shielding agent, an antioxidant, a light stabilizer, and an antistatic agent. You may contain. Moreover, in order to adjust the external appearance of the resin foam obtained, you may contain pigments, dyes, etc., such as carbon black.
- the resin foam of the present invention 1 has a minimum value of loss factor of primary antiresonance frequency in the range of 20 to 60 ° C. measured by mechanical impedance measurement (MIM) according to JIS G0602 of 0.05 or more, and 20 to 20
- the secondary antiresonant frequency in the range of 60 ° C. is 300 to 800 Hz.
- JIS G0602 is a standard for performing mechanical impedance measurement (MIM) in a state in which a test object is held between two steel plates, and determining the loss coefficient of the primary antiresonance frequency and the secondary antiresonance frequency.
- the resin foam is measured in a state of being held between the steel plates, the space between the interior and exterior of a car or the like, the space between the floor base material of the house and the surface material, the space between the outer wall of the house and the interior, It is considered to correspond to the case where it is used for applications such as a damping material and a sound insulation material used by being inserted in a space between the plates of a soundproof material consisting of a plurality of panels.
- the resin foam of the present invention 1 exhibits high vibration absorption because the minimum value of the loss coefficient of the primary antiresonance frequency (hereinafter, also simply referred to as “loss coefficient”) is 0.05 or more.
- the energy of sound can be lost to exhibit high sound insulation performance.
- the loss coefficient of the primary antiresonant frequency is preferably 0.06 or more, and more preferably 0.11 or more.
- the resin foam according to the first aspect of the invention has a low secondary resonance frequency of 300 to 800 Hz, so that even if resonance occurs with the materials to be combined, the frequency of the resonance is low. Can make it hard to feel as noise.
- the preferable lower limit of the secondary antiresonance frequency is 320 Hz
- the preferable upper limit is 720 Hz
- the more preferable lower limit is 330 Hz
- the more preferable upper limit is 630 Hz.
- the secondary antiresonance frequency of 300 to 800 Hz means that the minimum value of the secondary antiresonance frequency is 300 Hz or more and the maximum value is 800 Hz or less.
- the loss coefficient of the primary antiresonance frequency and the secondary antiresonance frequency in the range of 20 to 60 ° C. are measured because the resonance phenomenon has the largest amplitude of the primary resonance and the largest vibrational factor This is because it is a problem, and in many applications such as automobiles and homes, vibration in the middle frequency range of 300 to 800 Hz often causes problems, so it has an anti-resonance point in this range. Is preferable.
- the resin foam of the present invention 2 has a minimum value of loss coefficient of primary antiresonance frequency in the range of 20 to 60 ° C. measured by mechanical impedance measurement (MIM) according to JIS K 7391 or more, and 20 to 20
- the secondary antiresonant frequency in the range of 60 ° C. is 300 to 800 Hz.
- the resin foam of the present invention 2 exhibits high vibrational absorptivity by the fact that the minimum value of the loss coefficient of the primary antiresonant frequency is 0.005 or more, and loses energy of sound to achieve high sound insulation performance. It can be demonstrated.
- the loss coefficient of the primary antiresonant frequency is preferably 0.006 or more, and more preferably 0.007 or more.
- the resin foam according to the second aspect of the present invention has a secondary anti-resonance frequency of 300 to 800 Hz, so that even if resonance occurs with the materials to be combined, the frequency of the resonance is low. Can make it hard to feel as noise.
- the preferable lower limit of the secondary antiresonance frequency is 440 Hz
- the preferable upper limit is 740 Hz
- the more preferable lower limit is 470 Hz
- the more preferable upper limit is 720 Hz.
- the secondary antiresonance frequency of 300 to 800 Hz means that the minimum value of the secondary antiresonance frequency is 300 Hz or more and the maximum value is 800 Hz or less.
- the loss coefficient of the primary antiresonance frequency and the secondary antiresonance frequency in the range of 20 to 60 ° C. are measured. This is because it is a problem, and in many applications such as automobiles and homes, vibration in the middle frequency range of 300 to 800 Hz often causes problems, so it has an anti-resonance point in this range. Is preferable.
- the resin foam of the third aspect of the present invention has a maximum value of the loss factor of the primary antiresonance frequency in the range of 0 to 50 ° C. measured by mechanical impedance measurement (MIM) according to ISO 16940 of 0.20 or more and 0 to The secondary antiresonant frequency in the range of 30 ° C. is 800 Hz or less.
- ISO 16940 is a standard for performing mechanical impedance measurement (MIM) in a state in which a test object is held between two glass plates, and determining the loss coefficient of the primary antiresonant frequency and the secondary antiresonant frequency.
- the vibration absorbing property is exhibited at a high value because the maximum value of the loss coefficient of the primary antiresonant frequency is 0.20 or more, and the sound insulation performance is exhibited by losing the energy of sound. it can.
- the loss coefficient of the primary antiresonant frequency is preferably 0.24 or more, and more preferably 0.33 or more.
- the frequency of the resonance is low, so it is difficult for the human ear to feel as noise. It can be done.
- the secondary antiresonant frequency is preferably 780 Hz or less.
- the lower limit of the secondary antiresonance frequency is not particularly limited, but is preferably 300 Hz or more.
- the secondary antiresonance frequency of 800 Hz or less means that the maximum value of the secondary antiresonance frequency is 800 Hz or less.
- the loss coefficient of the primary antiresonance frequency in the range of 0 to 50 ° C. and the secondary antiresonance frequency in the range of 0 to 30 ° C. are measured in the resonance phenomenon. Is the largest problem as a factor of vibration, and in many cases, vibrations in the medium frequency range of 300 to 800 Hz practically become a problem regardless of applications such as automobiles and homes. It is because it is preferable to have an anti-resonance point.
- the loss factor and the secondary antiresonance frequency can be achieved by adjusting the foaming state of the resin foam. Specifically, for example, it is preferable to set the open cell rate of the resin foam to 20% or more. By setting the open cell ratio to 20% or more, it is possible to adjust the loss factor of the primary antiresonance frequency and the secondary antiresonance frequency of the obtained resin foam to a desired range, and exhibit extremely high sound insulation. It can be done.
- the open cell ratio is more preferably 30% or more, still more preferably 40% or more, and particularly preferably 50% or more.
- the upper limit of the said open-cell rate is not specifically limited, About 98% is a substantial upper limit.
- the open cells mean that the cells forming the resin foam are connected to each other.
- the above-mentioned open cell ratio is defined by the volume ratio of the cells connected to the outside of the resin foam to the apparent volume of the resin foam obtained by the dimension measurement, and is measured by the picnometer method described in JIS K 7138 or the like. can do.
- the preferable lower limit of the average cell diameter is 100 ⁇ m, and the preferable upper limit is 1000 ⁇ m.
- the average bubble diameter is in this range, higher sound insulation can be exhibited.
- a more preferable lower limit of the average cell diameter is 120 ⁇ m, a more preferable upper limit is 500 ⁇ m, and a further preferable lower limit is 200 ⁇ m.
- the said average bubble diameter can be measured by the method of observing a bubble wall part and a void part from the cross-sectional observation photograph of a bubble, and measuring the size of a void part.
- the resin foam of the present invention preferably has an average aspect ratio of 2 or less.
- the average aspect ratio of the air bubbles is 2 or less, higher sound insulation can be exhibited.
- the average aspect ratio of the bubbles is more preferably 1.5 or less.
- the average aspect ratio of the said bubble can be measured by the method of measuring the major axis and minor axis of a space
- the resin foam of the present invention preferably has an apparent density of 300 kg / m 3 or less.
- the apparent density is 300 kg / m 3 or less, it is possible to exhibit more excellent shock absorption, damping performance, and low flowability.
- the apparent density is more preferably 200 kg / m 3 or less.
- the lower limit of the apparent density is not particularly limited, but about 50 kg / m 3 is a practical lower limit.
- the upper limit of the thickness of the resin foam of the present invention is preferably 10 mm or less. If the upper limit of the thickness of the resin foam is in the above-mentioned preferable range, it is possible to make the resulting resin foam less likely to shear.
- the lower limit of the thickness of the resin foam of the present invention is preferably 50 ⁇ m or more. If the lower limit of the thickness of the resin foam is in the above-mentioned preferable range, the sound insulation of the obtained resin foam can be further improved.
- the method for producing the resin foam of the present invention is not particularly limited, for example, a thermal decomposition-type foaming agent is blended with the above-mentioned thermoplastic resin, plasticizer and optionally added additives to prepare a resin composition.
- the method of heating the resin composition to the foaming temperature to decompose the thermal decomposition type foaming agent is preferable.
- thermoplastic resin In order to make the open cell rate 20% or more, adjust the loss factor of the primary antiresonance frequency and the secondary antiresonance frequency to the desired range, and exhibit extremely high sound insulation, it is preferable to use thermoplastic resin and In addition to the choice of plasticizer, the setting of the type and amount of the thermal decomposition type foaming agent at the time of production, and the foaming temperature are very important. Above all, setting of the foaming temperature is essential to achieve a high open cell rate. It is preferable that the said foaming temperature is 180 degreeC or more. At a temperature of 180 ° C. or higher, the resin composition is sufficiently softened at the time of foaming to easily cause the cells to communicate with each other, so that it is considered that open cells are likely to be generated.
- the thermal decomposition type foaming agent is not particularly limited as long as it has a decomposition temperature of about 120 to 240 ° C., and conventionally known ones can be used.
- a thermal decomposition-type foaming agent whose decomposition temperature is 20 ° C. or more higher than the molding temperature of the resin composition which is a raw material before foaming, since the above-mentioned open cell rate can be further increased. It is more preferable to use a thermal decomposition type foaming agent.
- thermal decomposition type foaming agent examples include azodicarbonamide, N, N′-dinitrosopentamethylenetetramine, 4,4′-oxybis (benzenesulfonylhydrazide), urea, sodium hydrogen carbonate, and These mixtures etc. are mentioned.
- thermal decomposition type foaming agents commercially available ones include, for example, Cellmike series (manufactured by Sankyo Kasei Co., Ltd.), Binihall series, Cellular series, Neocelbon series (all manufactured by Eiwa Kasei Kogyo Co., Ltd.), etc. Be
- the compounding quantity of the said thermal decomposition-type foaming agent in the said resin composition is not specifically limited,
- the preferable lower limit with respect to 100 weight part of said thermoplastic resins is 4 weight part, and a preferable upper limit is 20 weight part. If the compounding quantity of the said thermal decomposition type foaming agent is in this range, a foam with an open cell rate of 10% or more can be manufactured.
- the more preferable lower limit of the compounding amount of the thermal decomposition type foaming agent is 5 parts by weight, and the more preferable upper limit is 15 parts by weight.
- the resin foam of the present invention can exhibit extremely high sound insulation performance which can not be achieved by the conventional sound insulation material made of a resin foam by having the above-mentioned constitution.
- the resin foam of this invention is very suitable as a sound insulation material and a soundproof material.
- it can be used in all applications such as members for vehicles such as automobiles, aircrafts and ships, construction members, electronic components, living members such as backings for carpets, household electrical appliances, and the like.
- molded the resin foam of this invention in the sheet form is excellent in handleability, and can be used suitably for many uses.
- the resin foam sheet which consists of a resin foam of this invention is also one of this invention.
- the adhesive tape in which the adhesive layer is formed on at least one surface of the resin foam sheet of the present invention is extremely excellent in handleability.
- a pressure-sensitive adhesive tape having the resin foam sheet of the present invention and a pressure-sensitive adhesive layer formed on at least one surface of the resin foam sheet is also one of the present invention.
- an adhesive which comprises the said adhesive layer For example, well-known adhesives, such as an acrylic adhesive, a urethane adhesive, and a rubber adhesive, are mentioned.
- a pressure-sensitive adhesive layer having high plasticizer resistance As the pressure-sensitive adhesive layer.
- the pressure-sensitive adhesive composition containing, for example, an acrylic polymer (X), a tackifying resin (Y) having a softening point of 140 to 160 ° C., and a crosslinking agent (Z) as the pressure-sensitive adhesive layer having high plasticizer resistance.
- the acrylic polymer (X) is an alkyl methacrylate monomer (A) containing 60% by weight or more of (meth) acrylic acid alkyl ester monomer (a) having 4 or less carbon atoms in the alkyl group, 100 parts by weight And a polymer obtained by polymerizing a monomer mixture containing 5 to 18 parts by weight of a carboxyl group-containing monomer (B).
- (meth) acrylic acid indicates acrylic acid or methacrylic acid
- (meth) acrylate indicates acrylate or methacrylate.
- the (meth) acrylic acid alkyl ester monomer (A) preferably contains 60% by weight or more of a (meth) acrylic acid alkyl ester monomer (a) having 4 or less carbon atoms in the alkyl group.
- a (meth) acrylic acid alkyl ester monomer (a) having 4 or less carbon atoms in the alkyl group is 60% by weight or more, the plasticizer resistance of the obtained pressure-sensitive adhesive layer becomes high.
- the content of the (meth) acrylic acid alkyl ester monomer (a) is more preferably 80% by weight or more, still more preferably 90% by weight or more, particularly preferably from the viewpoint of suppressing a decrease in adhesion to soft polyvinyl chloride Is 100% by weight.
- (meth) acrylic acid alkyl ester monomer (a) examples include methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, isopropyl (meth) acrylate and n-butyl (meth) acrylate. ) Acrylate, isobutyl (meth) acrylate, t-butyl (meth) acrylate and the like.
- These (meth) acrylic acid alkyl ester monomers (a) may be used alone or in combination of two or more.
- n-butyl (meth) acrylate is preferably contained, and it is more preferable to contain only n-butyl (meth) acrylate alone.
- the (meth) acrylic acid alkyl ester monomer (A) may contain a (meth) acrylic acid alkyl ester monomer (b) in which the alkyl group has 5 or more carbon atoms.
- Specific examples of the (meth) acrylic acid alkyl ester monomer (b) include 2-ethylhexyl (meth) acrylate, isooctyl (meth) acrylate, isononyl (meth) acrylate, lauryl (meth) acrylate and the like.
- the content is preferably 20% by weight or less, more preferably 10% by weight or less.
- the carboxyl group-containing monomer (B) is a polymerizable monomer that contains a carboxyl group in the molecule and is preferably a carboxyl group-containing vinyl monomer.
- Specific examples of the carboxyl group-containing monomer (B) include (meth) acrylic acid, itaconic acid, maleic acid, fumaric acid, crotonic acid and the like. These carboxyl group-containing monomers (B) may be used alone or in combination of two or more. Among them, (meth) acrylic acid is preferable, and acrylic acid is more preferable.
- the monomer mixture used as the raw material of the said acryl-type polymer (X) may further contain other monomers other than the said (meth) acrylic-acid alkylester monomer (A) and a carboxyl group-containing monomer (B).
- the other monomers include monomers containing polar groups other than carboxyl groups, and styrene-based monomers such as styrene, ⁇ -methylstyrene, o-methylstyrene, and p-methylstyrene.
- the preferable lower limit of the content of the carboxyl group-containing monomer (B) is 5 parts by weight with respect to 100 parts by weight of the (meth) acrylic acid alkyl ester monomer (A) in the monomer mixture which is a raw material of the acrylic polymer (X)
- the preferred upper limit is 18 parts by weight.
- the lower limit of the content of the carboxyl group-containing monomer (B) is preferably 6 parts by weight, more preferably 17 parts by weight, still more preferably 10 parts by weight, and still more preferably 15 parts by weight.
- the preferable lower limit of the weight average molecular weight of the acrylic polymer (X) is 550,000, and the preferable upper limit is 1,000,000.
- the weight average molecular weight is 550,000 or more, the plasticizer resistance of the obtained pressure-sensitive adhesive layer is increased.
- the weight average molecular weight is 1,000,000 or less, it can be suppressed that the pressure-sensitive adhesive layer is too hard, and the adhesive force to an adherend having a complicated shape can be exhibited.
- a more preferable lower limit of the weight average molecular weight is 600,000, a more preferable upper limit is 800,000, a still more preferable lower limit is 650,000, and a further preferable upper limit is 750,000.
- the acrylic polymer (X) is obtained by polymerizing the above-mentioned monomer mixture.
- the said polymerization method is not specifically limited, For example, the method etc. which radically polymerize the said monomer mixture in presence of a polymerization initiator are mentioned. More specifically, conventionally known polymerization methods such as solution polymerization, emulsion polymerization, suspension polymerization and bulk polymerization can be adopted.
- an organic peroxide type polymerization initiator for example, an organic peroxide type polymerization initiator, an azo type polymerization initiator, etc. are mentioned.
- the organic peroxide-based polymerization initiator include cumene hydroperoxide, benzoyl peroxide, lauroyl peroxide, octanoyl peroxide, stearoyl peroxide, o-chlorobenzoyl peroxide, acetyl peroxide, and t-butyl.
- azo polymerization initiator for example, 2,2′-azobisisobutyronitrile, 2,2′-azobis (2,4-dimethylvaleronitrile), 4,4′-azobis (4-cyanopentane) Acid), 2,2′-azobis (2-methylbutyronitrile) and the like.
- azo polymerization initiators may be used alone or in combination of two or more.
- lauroyl peroxide, octanoyl peroxide, stearoyl peroxide and 3,5,5-trimethylhexanoyl peroxide are preferable from the viewpoint of reducing the odor of the resulting acrylic polymer (X).
- the amount of the polymerization initiator is not particularly limited, but preferably about 0.01 to 10 parts by weight, more preferably about 0.05 to 2 parts by weight, with respect to 100 parts by weight of the monomer mixture.
- the preferable lower limit of the softening point of the tackifying resin (Y) is 140 ° C., and the preferable upper limit is 160 ° C. If the softening point is within the above range, it is possible to suppress the decrease in the adhesive strength of the obtained pressure-sensitive adhesive layer with time.
- the more preferable upper limit of the softening point is 150 ° C. from the viewpoint of further suppressing the decrease in adhesive strength with time.
- the softening point of the tackifying resin (Y) can be measured in accordance with JIS K2207.
- tackifying resin (Y) for example, rosin-based resins such as petroleum resin-based tackifying resins, hydrogenated petroleum resin-based tackifying resins, rosin diol-based tackifying resins, rosin ester-based tackifying resins, terpene resins, A phenol resin, a xylene resin, a coumarone resin, a ketone resin, and these modified resin etc. are mentioned. These tackifying resins may be used alone or in combination of two or more.
- a rosin-based tackifying resin is preferable, and a rosin ester-based tackifying resin is more preferable.
- the rosin ester-based tackifying resin include disproportionated rosin ester, polymerized rosin ester, hydrogenated rosin ester, rosin phenol-based resin and the like.
- the content of the component having a molecular weight of 600 or less is preferably 13% by weight or less in the tackifier resin (Y). If such a tackifying resin is used, the volatile component generated from the tackifying resin can be suppressed low while maintaining the adhesiveness. Furthermore, the viscosity of the pressure-sensitive adhesive layer can be made relatively high by reducing the amount of low molecular weight components, and the migration of the plasticizer to the pressure-sensitive adhesive layer is likely to be inhibited, and the decrease in adhesion with time is less likely to occur.
- Examples of the method for removing the component having a molecular weight of 600 or less from the tackifying resin include a method of heating and melting the tackifying resin to a temperature higher than the softening point, a method of blowing steam, and the like.
- the molecular weight of the said tackifying resin and its content are measured by gel permeation chromatography (GPC), and can be calculated by a polystyrene conversion value and an area ratio.
- the compounding quantity of tackifying resin (Y) in the said adhesive composition is 3 weight part with a preferable minimum with respect to 100 weight part of acrylic polymer (X), and a preferable upper limit is 9 weight part.
- a preferable upper limit is 9 weight part.
- the lower limit of the compounding amount of the tackifier resin (Y) is preferably 4 parts by weight, and more preferably 8 parts by weight.
- the preferred upper limit is 7 parts by weight.
- the said crosslinking agent (Z) has a role which improves the cohesion force of the adhesive layer obtained, and improves the physical property as an adhesive tape.
- said crosslinking agent (Z) For example, an isocyanate type crosslinking agent, an epoxy type crosslinking agent, an aziridine type crosslinking agent, a metal chelate type crosslinking agent etc. are mentioned. Among these, isocyanate crosslinking agents or metal chelate crosslinking agents are preferable.
- the isocyanate-based crosslinking agent examples include tolylene diisocyanate, naphthylene-1,5-diisocyanate and diphenylmethane diisocyanate.
- Coronate L by Nippon Polyurethane Co., Ltd. etc. are mentioned, for example.
- the metal chelate type crosslinking agent the chelate compound whose metal atom is aluminum, a zirconium, titanium, zinc, iron, tin etc. is mentioned.
- aluminum chelates in which the central metal is aluminum are preferable.
- Examples of commercially available products include Aluminum Chelate A and Aluminum Chelate M manufactured by Kawaken Fine Chemical Co., Ltd.
- the content of the crosslinking agent (Z) in the pressure-sensitive adhesive composition is not particularly limited, but a preferable lower limit is 0.005 parts by weight and a preferable upper limit is 5 parts by weight with respect to 100 parts by weight of the acrylic polymer (X).
- a more preferable lower limit is 0.01 parts by weight, a more preferable upper limit is 1 part by weight, a still more preferable lower limit is 0.02 parts by weight, and a still more preferable upper limit is 0.1 parts by weight.
- the pressure-sensitive adhesive composition contains, in addition to the acrylic polymer (X), the tackifying resin (Y), and the crosslinking agent (Z), a solvent such as ethyl acetate, dimethyl sulfoxide, ethanol, acetone, diethyl ether, etc. May be. Among them, ethyl acetate is preferable from the viewpoint of reducing the volatile component.
- the above-mentioned pressure-sensitive adhesive composition may further contain additives such as a filler, a pigment, a dye, an antioxidant and the like, if necessary.
- the preferable lower limit of the thickness of the pressure-sensitive adhesive layer is 5 ⁇ m, and the preferable upper limit is 200 ⁇ m. Sufficient adhesiveness can be exhibited as the thickness of an adhesive layer is in this range.
- a more preferable lower limit of the thickness of the pressure-sensitive adhesive layer is 7 ⁇ m, a more preferable upper limit is 150 ⁇ m, a still more preferable lower limit is 10 ⁇ m, and a still more preferable upper limit is 100 ⁇ m.
- the method for producing the pressure-sensitive adhesive tape of the present invention by forming the pressure-sensitive adhesive layer on at least one surface of the resin foam sheet of the present invention is not particularly limited.
- coating an adhesive using coating machines such as, the method of spraying and apply
- the resin foam, the resin foam sheet, and the pressure-sensitive adhesive tape of the present invention can exhibit extremely high sound insulation performance, and thus can exhibit excellent performance as a sound insulation material and a sound insulation material. For this reason, it can be used in all applications such as members for vehicles such as automobiles, aircrafts and ships, construction members, electronic parts, living members such as backings for carpets, household electrical appliances, and the like.
- the living members include members for the purpose of alleviating vibrations, shocks, sounds and the like, such as carpet backings, curtain materials, wallpaper and the like.
- Examples of the electric member include electronic components such as mobile phones, tablets and personal computers, audio, headphones, TVs, refrigerators, washing machines, household electric appliances such as cleaners and the like, or vibration for business electronic appliances.
- the member used for the purpose of alleviation of a sound etc. is mentioned.
- the member used for the purpose of the shock relaxation at the time of a rear impact such as a floor, a mat
- the resin foam, the resin foam sheet, and the adhesive tape of the present invention are particularly suitable as a vehicle member and a building member.
- the member for vehicles using the resin foam of the present invention, the resin foam sheet, or the adhesive tape is also one of the present invention.
- An architectural member using the resin foam, the resin foam sheet or the adhesive tape of the present invention is also one of the present invention.
- the member for the purpose of alleviation of vibration, impact, sound, etc. such as a ceiling material of vehicles, such as a car, an aircraft, and a ship, interior materials, interior backing materials, etc. is mentioned, for example. More specifically, for example, a deadning material used by directly affixing to a steel plate member such as a ceiling or door panel or floor plate of a vehicle such as an automobile, or a steel plate member constituting an exterior or casing and a resin member of an interior Damping material, cushion material, etc. to be used are mentioned.
- Examples of the building members include members for the purpose of alleviating vibrations, shocks, sounds, etc., such as floor base materials, materials for sound barriers, ceiling materials, backing materials made of resin and metal tiles, and the like. More specifically, for example, deadning materials that are directly stuck to metallic tiles made of galvary steel plate (registered trademark) as measures against rain noise, and sound insulation mats that are used by being sandwiched between flooring materials and base materials of housing floors are listed.
- the present invention it is possible to provide a resin foam, a resin foam sheet, an adhesive tape, a vehicle member and a building member capable of exhibiting extremely high sound insulation performance.
- Example 1 Production of resin foam 40 parts by weight of triethylene glycol di-2-ethylhexanoate (3GO) as a plasticizer and 100 parts by weight of polyvinyl butyral 1 (PVB1), and cell microphone as a thermal decomposition type foaming agent
- 3GO triethylene glycol di-2-ethylhexanoate
- PVB1 polyvinyl butyral 1
- cell microphone cell microphone
- the PVB 1 has a hydroxyl group content of 34 mol%, an acetylation degree of 1.0 mol%, a butyralization degree of 65 mol%, and an average polymerization degree of 1650.
- the obtained sheet-like body was decomposed in the oven at a foaming temperature of 220 ° C. to decompose the thermal decomposition-type foaming agent, to obtain a sheet-like resin foam (resin foam sheet).
- the thickness of the obtained resin foam sheet was 4 mm.
- a center using a laminated sample in which a resin foam is fixed between two steel plates having a width of 12 mm, a length of 240 mm, and a thickness of 1.6 mm with a double-sided tape (# 5782 manufactured by Sekisui Chemical Co., Ltd.)
- the loss factor of the primary antiresonant frequency and the secondary antiresonant frequency were measured by the excitation method.
- Example 2 to 4 and Comparative Example 4 A resin foam was produced in the same manner as in Example 1 except that the blending amounts of the thermal decomposition type foaming agent and the plasticizer were as shown in Table 1, and the loss factor of the primary antiresonance frequency and the secondary antiresonant frequency The resonant frequency was measured.
- Example 5 A resin foam was produced in the same manner as in Example 1 except that polyvinyl butyral 2 (PVB 2) was used instead of polyvinyl butyral 1 and the blending amount of the thermal decomposition type foaming agent was as shown in Table 1, and The loss factor of the antiresonance frequency and the secondary antiresonance frequency were measured.
- the PVB2 has a hydroxyl group content of 23 mol%, an acetylation degree of 13 mol%, a butyralization degree of 64 mol%, and an average polymerization degree of 2400.
- Comparative example 1 As a comparative example, a commercially available polyethylene foam (manufactured by Sekisui Chemical Co., Ltd., Softlon S, foaming ratio 30 times) was prepared. The loss factor of the primary antiresonance frequency and the secondary antiresonance frequency of the polyethylene foam were measured in the same manner as in Example 1.
- Comparative example 2 As a comparative example, a commercially available ethylene-vinyl acetate copolymer (EVA) foam (manufactured by Sanfuku Kogyo Co., Ltd., Mitsufuku Form V10) was prepared. The loss coefficient of the primary antiresonance frequency and the secondary antiresonance frequency of the EVA foam were measured in the same manner as in Example 1.
- EVA ethylene-vinyl acetate copolymer
- Comparative example 3 As a comparative example, a commercially available urethane gel (manufactured by Exseal Corporation, Exseal) was prepared. The loss coefficient of the primary antiresonance frequency and the secondary antiresonance frequency of the urethane gel were measured in the same manner as in Example 1.
- Example 5 A resin foam is produced in the same manner as in Example 1 except that Cellmic CAP (manufactured by Sankyo Kasei Co., Ltd., decomposition temperature 125 ° C.) is used as a thermal decomposition type foaming agent, and the foaming temperature is 150 ° C. The loss factor of the frequency and the secondary antiresonant frequency were measured.
- Cellmic CAP manufactured by Sankyo Kasei Co., Ltd., decomposition temperature 125 ° C.
- the loss factor of the frequency and the secondary antiresonant frequency were measured.
- the sound transmission loss was measured by the sound intensity method according to JIS A 1441.
- the measurement temperature was 20 ° C., and the frequency range was every 1/3 octave band of 100 to 10000 Hz.
- the sample is a 2 mm thick glass sandwiching a resin foam sample (about 4 mm thick), fixed with a double-sided tape (# 5782 manufactured by Sekisui Chemical Co., Ltd.), and the size (opening surface) 500 mm ⁇ 500 mm.
- Sound insulation performance was evaluated according to the following criteria. A graph of frequency-transmission loss was created, and when the difference in transmission loss between the first maximum value on the low frequency side and the adjacent minimum value was 7 dB or less, the difference in transmission loss exceeded 7 dB. The case was evaluated as "x".
- Air sound blocking performance was evaluated for air sound blocking performance.
- the measurement temperature was 25 ° C., and the frequency range was every 1/1 octave band of 31.5 to 4000 Hz.
- the sample is a resin foam sample (about 4 mm in thickness) fixed to a gypsum board with a double-sided tape (# 5782 manufactured by Sekisui Chemical Co., Ltd.), and the size (opening surface) 990 mm ⁇ 990 mm. Sound was generated from the reverberation chamber side with a sound pressure of 100 dB, and the differential pressure was measured on the anechoic chamber side.
- Air sound blocking performance was evaluated for air sound blocking performance.
- the measurement temperature was 25 ° C., and the frequency range was every 1/1 octave band of 31.5 to 4000 Hz.
- the sample uses a resin foam (approximately 4 mm in thickness) in which aluminum (0.3 mm) is fixed with double-sided tape (# 5782 manufactured by Sekisui Chemical Co., Ltd.), and the double-sided tape (Sekisui Chemical) does not have aluminum laminated. It fixes to a gypsum board by industrial company make, # 5782), size (opening surface) 990 mm x 990 mm.
- Sound was generated from the reverberation chamber side with a sound pressure of 100 dB, and the differential pressure was measured on the anechoic chamber side. Sound insulation performance was evaluated according to the following criteria. Create a graph of 1/1 octave band frequency-sound pressure level, and when the DM value is +2.0 dB or more on average with " ⁇ ", less than +2.0 dB against the condition that resin foam is not loaded "X".
- Example 6 As a pressure-sensitive adhesive layer, a double-sided adhesive tape for fixing an interior member (manufactured by Sekisui Chemical Co., Ltd., # 5782) was attached to one surface of the resin foam sheet obtained in Example 1 to obtain a single-sided adhesive tape.
- the obtained single-sided pressure-sensitive adhesive tape was able to exhibit tackiness while maintaining the flexibility and sound insulation of the resin foam sheet described in Example 1.
- the double-sided tape (# 5782 made by Sekisui Chemical Co., Ltd.) for fixing the interior member of the obtained single-sided pressure-sensitive adhesive tape is used as it is without newly sticking the double-sided tape.
- a double-sided tape (manufactured by Sekisui Chemical Co., Ltd., # 5782) was newly attached for measurement only to the side to which the double-sided tape for fixing the interior member was not attached.
- Example 7 (1) Production of Acrylic Polymer Into a reaction vessel, 100 parts by weight of n-butyl acrylate and 11 parts by weight of acrylic acid were introduced to obtain a monomer component. The monomer component is dissolved in ethyl acetate, and 0.1 part by weight of lauroyl peroxide is added as a polymerization initiator at the reflux point, and the mixture is refluxed at 70 ° C. for 5 hours to obtain an acrylic weight having a weight average molecular weight of 720,000. A combined solution was obtained.
- the obtained acrylic polymer solution contains a component having a molecular weight of 600 or less with respect to 100 parts by weight of the acrylic polymer which is a non-volatile component of the acrylic polymer solution. 6.3 parts by weight of a polymerized rosin ester-based tackifying resin (softening point 140 ° C.) having a content of 13%, and 0.054 parts by weight of aluminum chelate which is a metal chelate-based crosslinking agent as a crosslinking agent added. Thereafter, they were uniformly mixed to obtain a pressure-sensitive adhesive composition.
- the obtained pressure-sensitive adhesive composition is applied to one side of the resin foam sheet obtained in Example 1, and then dried at 120 ° C. for 5 minutes to form a 60 ⁇ m thick adhesive on one side of the resin foam sheet.
- the single-sided adhesive tape on which the agent layer was laminated was obtained.
- the obtained single-sided pressure-sensitive adhesive tape was able to exhibit tackiness while maintaining the flexibility and sound insulation of the resin foam sheet described in Example 1.
- the adhesion did not decrease even one month after the adhesion.
- the surface on which the pressure-sensitive adhesive layer of the obtained single-sided pressure-sensitive adhesive tape is laminated is used as it is without newly sticking the double-sided tape. Sekisui Chemical Co., Ltd. # 5782) was newly attached for measurement.
- Test Body Preparation The single-sided pressure-sensitive adhesive tape obtained in Examples 6 and 7 is cut into a width of 25 mm ⁇ length 150 mm, and 2 kg rubber roller according to JIS Z0237 according to JIS 304 (surface BA finish) specified in JIS G4305. Was crimped once at a speed of 10 mm / sec.
- Adhesive strength retention rate 100 ⁇ (adhesive strength over time / initial adhesive strength)
- Example 7 the adhesive strength maintenance rate of the single-sided adhesive tape obtained in Example 7 was significantly improved as compared to the adhesive strength maintenance rate of the single-sided adhesive tape obtained in Example 6.
- the present invention it is possible to provide a resin foam, a resin foam sheet, an adhesive tape, a vehicle member and a building member capable of exhibiting extremely high sound insulation performance.
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Abstract
Description
このような遮音材としては、樹脂等からなる発泡体、不織布、ゲル状物質等が一般的である。なかでも、樹脂発泡体は、優れた遮音性能を発揮できるとともに、取り扱い性にも優れることから、種々の分野において採用されている(特許文献1等)。発泡体では、入射した音による空気振動が内部の孔部分の空気に伝わり、該孔部分において空気の粘性摩擦が生じ、音のエネルギーの一部が熱エネルギーに変換され、遮音性能が生じると考えられている。
しかしながら、近年は遮音材に対する要求性能が更に厳しくなってきている。従来の樹脂発泡体からなる遮音材では、音の伝達経路に設置したときに音の透過を充分には抑えられず、音源からの音が遮音材を経た裏面側でも僅かながらノイズとして感じられるという問題があった。
以下に本発明を詳述する。
上記熱可塑性樹脂としては、例えば、ポリフッ化ビニリデン、ポリテトラフルオロエチレン、フッ化ビニリデン-六フッ化プロピレン共重合体、ポリ三フッ化エチレン、アクリロニトリル-ブタジエン-スチレン共重合体、ポリエステル、ポリエーテル、ポリアミド、ポリカーボネート、ポリアクリレート、ポリメタクリレート、ポリ塩化ビニル、ポリエチレン、ポリプロピレン、ポリスチレン、ポリビニルアセタール、エチレン-酢酸ビニル共重合体等が挙げられる。なかでも、ポリビニルアセタール、又は、エチレン-酢酸ビニル共重合体が好ましく、ポリビニルアセタールがより好ましい。
ポリビニルアセタールは、合わせガラス用中間膜の原材料として広く用いられている。合わせガラスの製造時においては、合わせガラス用中間膜をガラスと貼り合わせた際に、端部に余った合わせガラス用中間膜が切断され、大量の合わせガラス用中間膜が廃棄されている。本発明において、大量に発生する合わせガラス用中間膜の廃棄物を原料として用いれば、リサイクル等の観点からも極めて有意義である。
上記ポリビニルアセタールは、水酸基量の好ましい下限が15モル%、好ましい上限が40モル%である。水酸基量がこの範囲内であると、可塑剤との相溶性が高くなる。
なお、上記アセタール化度及び水酸基量は、例えば、JIS K 6728「ポリビニルブチラール試験方法」に準拠して測定できる。
上記ポリビニルアルコールは、通常、ポリ酢酸ビニルを鹸化することにより得られ、鹸化度70~99.8モル%のポリビニルアルコールが一般的に用いられる。上記ポリビニルアルコールの鹸化度は、80~99.8モル%であることが好ましい。
上記ポリビニルアルコールの重合度の好ましい下限は500、好ましい上限は4000である。上記ポリビニルアルコールの重合度が500以上であると、得られる樹脂発泡体の取り扱い性が優れるものとなる。上記ポリビニルアルコールの重合度が4000以下であると、樹脂発泡体の成形が容易になる。上記ポリビニルアルコールの重合度のより好ましい下限は1000、より好ましい上限は3600である。
上記グリコールとしては、例えば、トリエチレングリコール、テトラエチレングリコール、トリプロピレングリコール等が挙げられる。上記一塩基性有機酸としては、例えば、酪酸、イソ酪酸、カプロン酸、2-エチル酪酸、ヘプチル酸、n-オクチル酸、2-エチルヘキシル酸、ペラルゴン酸(n-ノニル酸)、デシル酸等が挙げられる。なかでも、トリエチレングリコールジカプロン酸エステル、トリエチレングリコールジ-2-エチル酪酸エステル、トリエチレングリコールジ-n-オクチル酸エステル、トリエチレングリコールジ-2-エチルヘキシル酸エステル等が好適である。
なお、多くの合わせガラス用中間膜では、ポリビニルアセタール100重量部に対する可塑剤の含有量が20~55重量部程度であることから、廃棄された合わせガラス用中間膜をそのまま、本発明の樹脂発泡体の原料として利用することができる。
上記粘着剤としては特に限定されず、例えば、アクリル系粘着剤、ウレタン系粘着剤、ゴム系粘着剤等の公知の粘着剤が挙げられる。
JIS G0602は、被験物を2枚の鋼板の間に挟持した状態で機械インピーダンス測定(MIM)を行い、1次反共振周波数の損失係数及び2次反共振周波数を求める規格である。鋼板の間に挟持した状態で測定することから、樹脂発泡体を自動車等の内装と外装の空隙や、住宅の床下地材と表材の空隙や、住宅の外壁と内装の間の空隙や、複数枚のパネルからなる防音材の板間の空隙等に挟みこんで用いる制振材や遮音材等の用途に用いた場合に対応しているものと考えられる。
なお、上記2次反共振周波数が300~800Hzであるとは、2次反共振周波数の最小値が300Hz以上、最大値が800Hz以下であることを意味する。
JIS K7391は、被験物の一方の面を1枚の鋼板に貼付し、他方の面は開放した状態で機械インピーダンス測定(MIM)を行い、1次反共振周波数の損失係数及び2次反共振周波数を求める規格である。一方の面を1枚の鋼板に貼付し、他方の面は開放した状態で測定することから、樹脂発泡体を自動車の内装や外装、住宅の外壁や内壁、遮音性能や防音性能を企図した壁等に、貼り付けて遮音性や防音性を得る遮音材、制振材等の用途に用いた場合に対応しているものと考えられる。
なお、上記2次反共振周波数が300~800Hzであるとは、2次反共振周波数の最小値が300Hz以上、最大値が800Hz以下であることを意味する。
ISO 16940は、被験物を2枚のガラス板の間に挟持した状態で機械インピーダンス測定(MIM)を行い、1次反共振周波数の損失係数及び2次反共振周波数を求める規格である。ガラス板の間に挟持した状態で測定することから、樹脂発泡体を壁面貼り付けミラーにおいてミラーガラスと壁面との間の空隙に挟み込んで振動を抑制する制振材や、テレビ、スマートフォン、タブレット、パーソナルコンピュータ等の前面板と筐体との間の空隙に挟みこんで用いる衝撃吸収材、制振材等の用途に用いた場合に対応しているものと考えられる。
なお、上記2次反共振周波数が800Hz以下であるとは、2次反共振周波数の最大値が800Hz以下であることを意味する。
なお、本明細書において連続気泡とは、樹脂発泡体を形成する気泡がお互いにつながっているものを意味する。
また、上記連続気泡率は、寸法測定によって得られる樹脂発泡体の見掛け体積に対する、樹脂発泡体の外部にまで連結している気泡の容積割合で定義され、JIS K 7138記載のピクノメータ法などにより測定することができる。
なお、上記平均気泡径は、気泡の断面観察写真より気泡壁部と空隙部とを観察して、空隙部のサイズを測定する方法により測定することができる。
なお、上記気泡の平均アスペクト比は、気泡の断面観察写真より空隙部の長径と短径とを測定してその比を計算する方法により測定することができる。
上記発泡温度は、180℃以上であることが好ましい。180℃以上の温度では、発泡時に上記樹脂組成物が充分に軟化して気泡同士が連通しやすくなるため、連続気泡が発生し易くなるものと考えられる。
上記熱分解型発泡剤のうち市販のものとしては、例えば、セルマイクシリーズ(三協化成社製)やビニホールシリーズ、セルラーシリーズ、ネオセルボンシリーズ(以上、永和化成工業社製)等が挙げられる。
具体的には例えば、自動車や航空機、船舶等の車両用部材、建築部材、電子部品、カーペットの裏材等の生活部材、家庭用、業務用の電気製品等のあらゆる用途に用いることができる。とりわけ、本発明の樹脂発泡体をシート状に成形した樹脂発泡体シートは、取り扱い性に優れ、多くの用途に好適に用いることができる。
本発明の樹脂発泡体からなる樹脂発泡体シートもまた、本発明の1つである。
本発明の樹脂発泡体シートと、該樹脂発泡体シートの少なくとも一方の面に形成された粘着剤層とを有する粘着テープもまた、本発明の1つである。
ただし、本発明の樹脂発泡体シートは可塑剤を含有することから、上記粘着剤層へ可塑剤が移行することにより、粘着力の低下が生じる恐れがある。そこで、上記粘着剤層として、可塑剤耐性の高い粘着剤層を用いることが好ましい。
上記可塑剤耐性の高い粘着剤層としては、例えば、アクリル系重合体(X)、軟化点が140~160℃である粘着付与樹脂(Y)、及び、架橋剤(Z)を含む粘着剤組成物により形成された粘着剤層等が挙げられる。このような粘着剤組成物を用いることで、可塑剤の移行に由来する経時的な粘着力の低下が生じにくくなる。
以下、上記粘着剤組成物を構成する各成分について詳しく説明する。
なお、本明細書において、(メタ)アクリル酸はアクリル酸又はメタクリル酸を示し、(メタ)アクリレートはアクリレート又はメタクリレートを示す。
上記(メタ)アクリル酸アルキルエステルモノマー(b)としては、具体的には例えば、2-エチルヘキシル(メタ)アクリレート、イソオクチル(メタ)アクリレート、イソノニル(メタ)アクリレート、ラウリル(メタ)アクリレート等が挙げられる。
上記(メタ)アクリル酸アルキルエステルモノマー(A)が上記(メタ)アクリル酸アルキルエステルモノマー(b)を含む場合の含有量は、好ましくは20重量%以下、より好ましくは10重量%以下である。
上記カルボキシル基含有モノマー(B)としては、具体的には例えば、(メタ)アクリル酸、イタコン酸、マレイン酸、フマル酸、クロトン酸等が挙げられる。これらのカルボキシル基含有モノマー(B)は単独で用いてもよく、2種以上を併用してもよい。なかでも、(メタ)アクリル酸が好ましく、アクリル酸がより好ましい。
上記その他のモノマーとしては、例えば、カルボキシル基以外の極性基を含有するモノマー、スチレン、α-メチルスチレン、o-メチルスチレン、及びp-メチルスチレン等のスチレン系モノマー等が挙げられる。
上記重合方法は特に限定されないが、例えば、上記モノマー混合物を重合開始剤の存在下にてラジカル重合させる方法等が挙げられる。より具体的には、溶液重合、乳化重合、懸濁重合、塊状重合等の従来公知の重合方法を採用できる。
上記有機過酸化物系重合開始剤としては、例えば、クメンハイドロパーオキサイド、ベンゾイルパーオキサイド、ラウロイルパーオキサイド、オクタノイルパーオキサイド、ステアロイルパーオキサイド、o-クロロベンゾイルパーオキサイド、アセチルパーオキサイド、t-ブチルハイドロパーオキサイド、t-ブチルパーオキシアセテート、t-ブチルパーオキシイソブチレート、3,5,5-トリメチルヘキサノイルパーオキサイド、t-ブチルパーオキシ-2-エチルヘキサノエート又はジ-t-ブチルパーオキサイド等が挙げられる。
上記アゾ系重合開始剤としては、例えば、2,2’-アゾビスイソブチロニトリル、2,2’-アゾビス(2,4-ジメチルバレロニトリル)、4,4’-アゾビス(4-シアノペンタン酸)、2,2’-アゾビス(2-メチルブチロニトリル)等が挙げられる。
これらの重合開始剤は単独で用いてもよく、2種以上を併用してもよい。なかでも、得られるアクリル系重合体(X)の臭気低減の観点から、ラウロイルパーオキサイド、オクタノイルパーオキサイド、ステアロイルパーオキサイド、3,5,5-トリメチルヘキサノイルパーオキサイドが好ましい。
上記重合開始剤の量は特に限定されないが、上記モノマー混合物100重量部に対して、好ましくは0.01~10重量部、より好ましくは0.05~2重量部程度用いる。
なお、上記粘着付与樹脂(Y)の軟化点は、JIS K2207に準拠して測定することができる。
上記ロジンエステル系粘着付与樹脂としては、不均化ロジンエステル、重合ロジンエステル、水添ロジンエステル、ロジンフェノール系等が挙げられる。
粘着付与樹脂から分子量600以下の成分を除去する方法としては、例えば、粘着付与樹脂を軟化点以上に加熱溶融する方法、水蒸気を吹き込む方法等が挙げられる。
なお、上記粘着付与樹脂の分子量及びその含有量はゲルパーミエーションクロマトグラフィー(GPC)により測定し、ポリスチレン換算値及び面積比により算出できる。
上記架橋剤(Z)としては特に限定されないが、例えば、イソシアネート系架橋剤、エポキシ系架橋剤、アジリジン系架橋剤、金属キレート系架橋剤等が挙げられる。なかでも、イソシアネート系架橋剤又は金属キレート系架橋剤が好ましい。
上記金属キレート系架橋剤としては、具体的には例えば、金属原子がアルミニウム、ジルコニウム、チタニウム、亜鉛、鉄、スズ等であるキレート化合物が挙げられる。なかでも、中心金属がアルミニウムであるアルミニウムキレートが好ましい。市販品としては、川研ファインケミカル株式会社製のアルミキレートA、アルミキレートM等が挙げられる。
上記粘着剤組成物中の架橋剤(Z)の含有量は特に限定されないが、上記アクリル系重合体(X)100重量部に対する好ましい下限は0.005重量部、好ましい上限は5重量部であり、より好ましい下限は0.01重量部、より好ましい上限は1重量部であり、更に好ましい下限は0.02重量部、更に好ましい上限は0.1重量部である。
上記粘着剤組成物には、更に必要に応じて、充填剤、顔料、染料、酸化防止剤等の添加剤を含有してもよい。
上記生活部材としては、例えば、カーペット裏材、カーテン素材、壁紙等の、振動、衝撃、音等の緩和を目的とした部材が挙げられる。
上記電気部材としては、例えば、携帯電話、タブレット、パソコン等の電子部品や、オーディオ、ヘッドフォン、テレビ、冷蔵庫、洗濯機、掃除機等の家電製品等、或いは業務用電気製品において、振動、衝撃、音等の緩和を目的として用いられる部材が挙げられる。
上記その他の用途の部材としては、例えば、室内外運動施設における床、マット、壁等の、追突時の衝撃緩和を目的として用いられる部材が挙げられる。
本発明の樹脂発泡体、樹脂発泡体シート又は粘着テープを用いた車両用部材もまた、本発明の1つである。
本発明の樹脂発泡体、樹脂発泡体シート又は粘着テープを用いた建築部材もまた、本発明の1つである。
より具体的には例えば、自動車等の車両の天井やドアパネル、床板等の鋼板部材に直接貼り付けて用いるデッドニング材や、外装や躯体を構成する鋼板部材と内装の樹脂部材との間に挟んで用いるダンピング材、クッション材等が挙げられる。
より具体的には例えば、ガルバリウム鋼板(登録商標)からなる金属瓦に雨音対策として直接貼り付けるデッドニング材や、住宅床のフローリング材と下地材との間に挟み込んで使用する遮音マット等が挙げられる。
(1)樹脂発泡体の製造
ポリビニルブチラール1(PVB1)100重量部に対して、可塑剤としてトリエチレングリコールジ-2-エチルヘキサノエート(3GO)を40重量部、熱分解型発泡剤としてセルマイクCE(三協化成社製、分解温度208℃)を9重量部加えて樹脂組成物を得た。得られた樹脂組成物を110℃にてミキシングロールで充分に混練した後、押出機により押出して、シート状体を得た。なお、PVB1は、水酸基の含有率34モル%、アセチル化度1.0モル%、ブチラール化度65モル%、平均重合度1650である。
得られたシート状体を、オーブン中、220℃の発泡温度にて熱分解型発泡剤を分解させることにより、シート状の樹脂発泡体(樹脂発泡体シート)を得た。得られた樹脂発泡体シートの厚みは4mmであった。
得られた樹脂発泡体について、JIS K 7138に準拠してピクノメータ法により連続気泡率を測定した。また、測定重量と寸法測定によって得られる見掛け体積とから計算する方法により見掛け密度を測定した。
(3-1)JIS G0602による測定
JIS G0602に従って機械インピーダンス測定(MIM)により、20~60℃の範囲における1次反共振周波数の損失係数、及び、20~60℃の範囲における2次反共振周波数を測定した。
具体的には、幅12mm、長さ240mm、厚み1.6mmの鋼板2枚の間に、樹脂発泡体を両面テープ(積水化学工業社製、#5782)にて固定した積層サンプルを用いた中央加振法により、1次反共振周波数の損失係数及び2次反共振周波数を測定した。
JIS K7391に従って機械インピーダンス測定(MIM)により、20~60℃の範囲における1次反共振周波数の損失係数、及び、20~60℃の範囲における2次反共振周波数を測定した。
具体的には、幅12mm、長さ240mm、厚み1.6mmの鋼板上に、樹脂発泡体を両面テープ(積水化学工業社製、#5782)にて固定した積層サンプルを用いた中央加振法により、1次反共振周波数の損失係数及び2次反共振周波数を測定した。
ISO 16940に従って機械インピーダンス測定(MIM)により、0~50℃の範囲における1次反共振周波数の損失係数、及び、0~30℃の範囲における2次反共振周波数を測定した。
具体的には、幅25mm、長さ305mm、厚み2mmのガラス板2枚の間に、樹脂発泡体を両面テープ(積水化学工業社製、#5782)にて固定した積層サンプルを用いた中央加振法により、1次反共振周波数の損失係数及び2次反共振周波数を測定した。
熱分解型発泡剤、可塑剤の配合量を表1に示したようにした以外は実施例1と同様にして樹脂発泡体を製造し、1次反共振周波数の損失係数、及び、2次反共振周波数を測定した。
ポリビニルブチラール1に代えてポリビニルブチラール2(PVB2)を用い、熱分解型発泡剤の配合量を表1に示したようにした以外は実施例1と同様にして樹脂発泡体を製造し、1次反共振周波数の損失係数、及び、2次反共振周波数を測定した。なお、PVB2は、水酸基の含有率23モル%、アセチル化度13モル%、ブチラール化度64モル%、平均重合度2400である。
比較例として市販のポリエチレン発泡体(積水化学工業社製、ソフトロンS、発泡倍率30倍)を準備した。該ポリエチレン発泡体について、実施例1と同様にして1次反共振周波数の損失係数、及び、2次反共振周波数を測定した。
比較例として市販のエチレン-酢酸ビニル共重合体(EVA)発泡体(三福工業社製、ミツフクフォームV10)を準備した。該EVA発泡体について、実施例1と同様にして1次反共振周波数の損失係数、及び、2次反共振周波数を測定した。
比較例として市販のウレタンゲル(エクシールコーポレーション社製、エクシール)を準備した。該ウレタンゲルについて、実施例1と同様にして1次反共振周波数の損失係数、及び、2次反共振周波数を測定した。
熱分解型発泡剤としてセルマイクCAP(三協化成社製、分解温度125℃)を用い、発泡温度を150℃とした以外は実施例1と同様にして樹脂発泡体を製造し、1次反共振周波数の損失係数、及び、2次反共振周波数を測定した。
実施例及び比較例で得た樹脂発泡体について、以下の方法により評価を行った。
結果を表1、2に示した。
JIS A 1441に準拠する音響インテンシティ法により音響透過損失を測定した。測定温度は20℃、周波数範囲は100~10000Hzの1/3オクターブバンド毎とした。サンプルは、2mm厚のガラスで樹脂発泡体サンプル(厚み約4mm)を挟み込み、両面テープ(積水化学工業社製、#5782)にて固定、サイズ(開口面)500mm×500mm。入射パワーは残響室内5点の平均音圧レベルより算出し、透過パワーは測定エリア(500mm×500mm)の5×5=25点の音響インテンシティにより算出した。
遮音性能について、以下の基準により評価した。
周波数-透過損失のグラフを作成し、低周波側の第一の極大値と隣り合う極小値との透過損失の差が7dB以下の場合を「○」とし、透過損失の差が7dBを超えた場合を「×」と評価した。
JIS A 1417-1に準拠する建築物及び建築部材の遮音性能の評価方法:空気音遮断性能により、空気音遮断性能について評価した。
測定温度は25℃、周波数範囲は31.5~4000Hzの1/1オクターブバンド毎とした。サンプルは、樹脂発泡体サンプル(厚み約4mm)を両面テープ(積水化学工業社製、#5782)にて石膏ボードに固定、サイズ(開口面)990mm×990mm。残響室側から、100dBの音圧にて音を発生させ、無響室側にて差圧を測定した。
遮音性能について、以下の基準により評価した。
1/1オクターブバンド周波数-音圧レベルのグラフを作成し、樹脂発泡体を載せていない状態に対して、DM値が平均で+1.0dB以上の場合を「〇」、+1.0dB未満の場合を「×」とした。
JIS A 1417-1に準拠する建築物及び建築部材の遮音性能の評価方法:空気音遮断性能により、空気音遮断性能について評価した。
測定温度は25℃、周波数範囲は31.5~4000Hzの1/1オクターブバンド毎とした。サンプルは、アルミ(0.3mm)を両面テープ(積水化学工業社製、#5782)にて固定した樹脂発泡体(厚み約4mm)を用い、アルミが積層されていない面を両面テープ(積水化学工業社製、#5782)にて石膏ボードに固定、サイズ(開口面)990mm×990mm。残響室側から、100dBの音圧にて音を発生させ、無響室側にて差圧を測定した。
遮音性能について、以下の基準により評価した。
1/1オクターブバンド周波数-音圧レベルのグラフを作成し、樹脂発泡体を載せていない状態に対して、DM値が平均で+2.0dB以上の場合を「〇」、+2.0dB未満の場合を「×」とした。
実施例1で得られた樹脂発泡体シートの片面に粘着剤層として、内装部材固定用両面テープ(積水化学工業社製、#5782)を貼り付けて片面粘着テープを得た。
得られた片面粘着テープは、実施例1記載の樹脂発泡体シートの柔軟性と遮音性を維持したまま粘着性を発揮することができた。
なお、遮音性測定時には、得られた片面粘着テープの内装部材固定用両面テープ(積水化学工業社製、#5782)が貼られている面はそのまま両面テープを新たに貼りつけることなく利用し、内装部材固定用両面テープが貼られていない面にのみ両面テープ(積水化学工業社製、#5782)を測定のために新たに貼り付けた。
(1)アクリル系重合体の製造
反応容器の内に、n-ブチルアクリレート100重量部及びアクリル酸11重量部を導入しモノマー成分を得た。該モノマー成分を酢酸エチルに溶解して、還流点において、重合開始剤としてラウロイルパーオキサイド0.1重量部を添加し、70℃で5時間還流させて、重量平均分子量が72万のアクリル系重合体の溶液を得た。
得られたアクリル系重合体溶液に、アクリル系重合体溶液の不揮発分であるアクリル系重合体100重量部に対して、分子量600以下の成分の含有量が13%である重合ロジンエステル系粘着付与樹脂(軟化点140℃)を6.3重量部、及び、架橋剤として金属キレート系架橋剤であるアルミニウムキレートを0.054重量部となるように加えた。その後、均一に混合して粘着剤組成物を得た。
次いで、得られた該粘着剤組成物を、実施例1で得られた樹脂発泡体シートの片面に塗布した後、120℃で5分乾燥させ、樹脂発泡体シートの片面に厚さ60μmの粘着剤層が積層された片面粘着テープを得た。
得られた片面粘着テープは、実施例1記載の樹脂発泡体シートの柔軟性と遮音性を維持したまま粘着性を発揮することができた。また、粘着後1カ月が経過しても粘着性が低下することもなかった。
なお、遮音性測定時には、得られた片面粘着テープの粘着剤層が積層された面はそのまま両面テープを新たに貼りつけることなく利用し、粘着剤層が積層されていない面にのみ両面テープ(積水化学工業社製、#5782)を測定のために新たに貼り付けた。
実施例6、7で得た片面粘着テープについて、以下の方法により評価を行った。
(1)試験体準備
実施例6、7で得られた片面粘着テープを、幅25mm×長さ150mmに切り出し、JIS G4305に規定するSUS304(表面BA仕上げ)に、JIS Z0237に準じて2kgゴムローラーを10mm/秒の速度で1往復させ圧着した。
上記試験体準備で得た片面粘着テープを、23℃、50%RHにて圧着から20分間放置した後、JIS Z0237に準じて、90度剥離試験を試験数3にて実施し、平均値を初期粘着力(N/25mm)とした。なお、剥離速度は300mm/分であった。
上記試験体準備で得た試験体を60℃の雰囲気下で72時間放置し、ついで23℃、50%RHにて30分間放置した後、JIS Z0237に準じ、90度剥離試験を試験数3にて実施し、平均値を経時粘着力(N/25mm)とした。
上記で得られた初期粘着力及び経時粘着力を用いて、以下の式により粘着力維持率(%)を算出した。
粘着力維持率(%)=100×(経時粘着力/初期粘着力)
Claims (9)
- 熱可塑性樹脂と可塑剤を含有し、多数の気泡を有する樹脂発泡体であって、
JIS G0602に従って機械インピーダンス測定(MIM)により測定される20~60℃の範囲における1次反共振周波数の損失係数の最小値が0.05以上、かつ、20~60℃の範囲における2次反共振周波数が300~800Hzである
ことを特徴とする樹脂発泡体。 - 熱可塑性樹脂と可塑剤を含有し、多数の気泡を有する樹脂発泡体であって、
JIS K7391に従って機械インピーダンス測定(MIM)により測定される20~60℃の範囲における1次反共振周波数の損失係数の最小値が0.005以上、かつ、20~60℃の範囲における2次反共振周波数が300~800Hzである
ことを特徴とする樹脂発泡体。 - 熱可塑性樹脂と可塑剤を含有し、多数の気泡を有する樹脂発泡体であって、
ISO 16940に従って機械インピーダンス測定(MIM)により測定される0~50℃の範囲における1次反共振周波数の損失係数の最大値が0.20以上、かつ、0~30℃の範囲における2次反共振周波数が800Hz以下である
ことを特徴とする樹脂発泡体。 - ISO 16940に従って機械インピーダンス測定(MIM)により測定される0~50℃の範囲における1次反共振周波数の損失係数の最大値が0.24以上であることを特徴とする請求項3記載の樹脂発泡体。
- 粘着剤を含有することを特徴とする請求項1、2、3又は4記載の樹脂発泡体。
- 請求項1、2、3、4又は5記載の樹脂発泡体からなることを特徴とする樹脂発泡体シート。
- 請求項6記載の樹脂発泡体シートと、該樹脂発泡体シートの少なくとも一方の面に形成された粘着剤層とを有することを特徴とする粘着テープ。
- 請求項1、2、3、4若しくは5記載の樹脂発泡体、請求項6記載の樹脂発泡体シート、又は、請求項7記載の粘着テープを用いたことを特徴とする車両用部材。
- 請求項1、2、3、4若しくは5記載の樹脂発泡体、請求項6記載の樹脂発泡体シート、又は、請求項7記載の粘着テープを用いたことを特徴とする建築部材。
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EP18827429.4A EP3650489A4 (en) | 2017-07-07 | 2018-07-05 | RESIN FOAM, RESIN FOAM SHEET, ADHESIVE TAPE, VEHICLE ELEMENT AND CONSTRUCTION ELEMENT |
JP2018540881A JP6571881B2 (ja) | 2017-07-07 | 2018-07-05 | 樹脂発泡体、樹脂発泡体シート、粘着テープ、車両用部材及び建築部材 |
CN201880044184.8A CN110832017A (zh) | 2017-07-07 | 2018-07-05 | 树脂发泡体、树脂发泡体片、粘合带、车辆用部件和建筑部件 |
KR1020197026738A KR20200026788A (ko) | 2017-07-07 | 2018-07-05 | 수지 발포체, 수지 발포체 시트, 점착 테이프, 차량용 부재 및 건축 부재 |
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