WO2022210956A1 - Resin foamed body and foamed member - Google Patents
Resin foamed body and foamed member Download PDFInfo
- Publication number
- WO2022210956A1 WO2022210956A1 PCT/JP2022/016236 JP2022016236W WO2022210956A1 WO 2022210956 A1 WO2022210956 A1 WO 2022210956A1 JP 2022016236 W JP2022016236 W JP 2022016236W WO 2022210956 A1 WO2022210956 A1 WO 2022210956A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- resin foam
- resin
- weight
- foam
- parts
- Prior art date
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- 239000011347 resin Substances 0.000 title claims abstract description 311
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- 238000011084 recovery Methods 0.000 claims abstract description 24
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- 238000000034 method Methods 0.000 description 35
- 239000001569 carbon dioxide Substances 0.000 description 34
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- 239000002243 precursor Substances 0.000 description 1
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- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
Images
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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
- C08J9/0061—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof characterized by the use of several polymeric components
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/18—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by features of a layer of foamed material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2266/00—Composition of foam
- B32B2266/02—Organic
- B32B2266/0214—Materials belonging to B32B27/00
- B32B2266/025—Polyolefin
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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
- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
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- C—CHEMISTRY; METALLURGY
- 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
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/01—Use of inorganic substances as compounding ingredients characterized by their specific function
- C08K3/013—Fillers, pigments or reinforcing additives
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/10—Homopolymers or copolymers of propene
- C08L23/12—Polypropene
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Abstract
Description
100Y-4X>3 ・・・(1)
該樹脂発泡体に1000g/cm2の荷重を加えた状態で120秒間維持した後の厚み回復率が、80%以上である。
1つの実施形態においては、プレス後のバルク状態における前記光透過率Xが、2.0%以下である。
1つの実施形態においては、上記見かけ密度Yが、0.4g/cm3未満である。
1つの実施形態においては、上記樹脂発泡体は、気泡数密度が、30個/mm2以上である。
1つの実施形態においては、上記樹脂発泡体は、気泡径の変動係数が、0.5以下である。
1つの実施形態においては、上記樹脂発泡体は、平均気泡径が、10μm~200μmである。
1つの実施形態においては、上記樹脂発泡体は、気泡率が、30%以上である。
1つの実施形態においては、上記樹脂発泡体は、50%圧縮荷重が、20N/cm2以下である。
1つの実施形態においては、上記樹脂発泡体は、ポリオレフィン系樹脂を含む。
1つの実施形態においては、上記ポリオレフィン系樹脂が、ポリオレフィン系エラストマー以外のポリオレフィンとポリオレフィン系エラストマーの混合物である。
1つの実施形態においては、上記樹脂発泡体は、片面または両面に、熱溶融層を有する。
本発明の別の局面によれば、発泡部材が提供される。この発泡部材は、樹脂発泡層と、該樹脂発泡層の少なくとも一方の側に配置された粘着剤層を有し、該樹脂発泡層は上記樹脂発泡体である。 The resin foam of the present invention is a resin foam having a cell structure and an apparent density Y of 0.03 g/cm 3 or more, wherein the light transmittance X (%) in the bulk state after pressing and the apparent density Y (g/cm 3 ) satisfies the relationship of the following formula (1),
100Y-4X>3 (1)
The thickness recovery rate after a load of 1000 g/cm 2 is applied to the resin foam and maintained for 120 seconds is 80% or more.
In one embodiment, the light transmittance X in the bulk state after pressing is 2.0% or less.
In one embodiment, the apparent density Y is less than 0.4 g/cm 3 .
In one embodiment, the resin foam has a cell number density of 30 cells/mm 2 or more.
In one embodiment, the resin foam has a coefficient of variation of cell diameter of 0.5 or less.
In one embodiment, the resin foam has an average cell diameter of 10 μm to 200 μm.
In one embodiment, the resin foam has a void content of 30% or more.
In one embodiment, the resin foam has a 50% compression load of 20 N/cm 2 or less.
In one embodiment, the resin foam contains a polyolefin resin.
In one embodiment, the polyolefin-based resin is a mixture of a polyolefin other than a polyolefin-based elastomer and a polyolefin-based elastomer.
In one embodiment, the resin foam has a hot melt layer on one side or both sides.
According to another aspect of the invention, a foam member is provided. This foam member has a resin foam layer and an adhesive layer disposed on at least one side of the resin foam layer, and the resin foam layer is the resin foam.
本発明の樹脂発泡体は、気泡構造(セル構造)を有する。気泡構造(セル構造)としては、独立気泡構造、連続気泡構造、半連続半独立気泡構造(独立気泡構造と連続気泡構造が混在している気泡構造)などが挙げられる。好ましくは、樹脂発泡体の気泡構造は、半連続半独立気泡構造である。代表的には、本発明の樹脂発泡体は、樹脂組成物を発泡させることにより得られる。上記樹脂組成物は、樹脂発泡体を構成する樹脂を少なくとも含有する組成物である。上記樹脂発泡体は、見かけ密度Yが0.03g/cm3以上である。 A. Resin Foam The resin foam of the present invention has a cell structure. Examples of the cell structure include a closed cell structure, an open cell structure, a semi-open and semi-closed cell structure (a cell structure in which a closed cell structure and an open cell structure are mixed), and the like. Preferably, the cell structure of the resin foam is a semi-open and semi-closed cell structure. Typically, the resin foam of the present invention is obtained by foaming a resin composition. The resin composition is a composition containing at least a resin constituting a resin foam. The resin foam has an apparent density Y of 0.03 g/cm 3 or more.
100Y-4X>3 ・・・(1)
100Y-4X>3.5 ・・・(1)’ In the resin foam, the light transmittance X (%) in the bulk state after pressing and the apparent density Y (g/cm 3 ) satisfy the relationship of the following formula (1). Preferably, the relationship between the light transmittance X (%) in the bulk state after pressing, the apparent density Y (g/cm 3 ), and the following formula (1)′ is satisfied. By satisfying such a relationship between the light transmittance X (%) and the apparent density Y (g/cm 3 ) in the bulk state after pressing, a resin foam having excellent light blocking properties can be obtained. In one embodiment, "100Y-4X" is less than 8 (preferably 6, more preferably 4).
100Y-4X>3 (1)
100Y-4X>3.5 (1)'
Z+6X<30 ・・・(2)
Z+6X<20 ・・・(2)’
Z+6X<0.05 ・・・(2)’’ In one embodiment, in the resin foam, the light transmittance X (%) in the bulk state after pressing and the expansion ratio Z (times) satisfy the relationship of the following formula (2). More preferably, the relationship between the light transmittance X (%) in the bulk state after pressing, the expansion ratio Z, and the following formula (2)' is satisfied. More preferably, the relationship between the light transmittance X (%) in the bulk state after pressing, the foaming ratio Z (times), and the following formula (2)'' is satisfied. If the light transmittance X (%) and the foaming ratio Z (times) in the bulk state after pressing satisfy such a relationship, the effect of the present invention becomes remarkable. In one embodiment, "Z+6X" is greater than 0.005 (preferably 0.01). The expansion ratio is calculated by dividing the density in the bulk state after pressing/the apparent density of the resin foam.
Z+6X<30 (2)
Z+6X<20 (2)'
Z+6X<0.05 (2)''
・衝撃力センサー上に、樹脂発泡体、両面テープ(品番:No.5603W、日東電工製)、PETフィルム(品番:ダイヤホイルMRF75、三菱樹脂製)をこの順に配置して試験体を形成した。PETフィルム上方50cmの高さから、66gの鉄球を試験体に落下させて、衝撃力F1を測定する。
・また、衝撃力センサーに直接、上記のように鉄球を落下させて、ブランクの衝撃力F0を測定する。
・F1、F0から、(F0-F1)/F0×100の式により、衝撃吸収性(%)を算出する。 The impact absorption of the resin foam is preferably 20% or more, more preferably 27% or more, still more preferably 30% or more, particularly preferably 35% or more, and most preferably 40%. That's it. Impact absorption is measured as follows.
A test sample was formed by placing a resin foam, double-sided tape (product number: No. 5603W, manufactured by Nitto Denko), and PET film (product number: Diafoil MRF75, manufactured by Mitsubishi Plastics) in this order on the impact force sensor. A 66-g iron ball is dropped onto the specimen from a height of 50 cm above the PET film, and the impact force F1 is measured.
・Furthermore, the impact force F0 of the blank is measured by dropping the iron ball directly onto the impact force sensor as described above.
・From F1 and F0, calculate the impact absorption (%) by the formula (F0-F1)/F0×100.
本発明の樹脂発泡体は、代表的には、樹脂組成物を発泡させて得られ得る。樹脂組成物は、任意の適切な樹脂材料(ポリマー)を含む。1つの実施形態においては、非架橋性の樹脂組成物が用いられる。非架橋性の樹脂組成物は、後述の樹脂発泡体の形成方法に好適に用いられる。 A-1. Resin Composition The resin foam of the present invention can typically be obtained by foaming a resin composition. The resin composition includes any suitable resin material (polymer). In one embodiment, a non-crosslinkable resin composition is used. A non-crosslinkable resin composition is suitably used in the method for forming a resin foam, which will be described later.
重量平均分子量および数平均分子量は、ゲルパーミエーションクロマトグラフィ測定(溶媒:テトラヒドロフラン、ポリスチレン換算)により求めることができる。 The weight average molecular weight of the polyolefin is preferably 50,000 to 120,000, more preferably 55,000 to 110,000, still more preferably 60,000 to 100,000. Within such a range, the die swell ratio and shear viscosity of the resin can be preferably adjusted. Further, the molecular weight distribution (weight average molecular weight/number average molecular weight) of the polyolefin is preferably 7-10, more preferably 6-9. Within such a range, the die swell ratio and shear viscosity of the resin can be preferably adjusted.
The weight average molecular weight and number average molecular weight can be determined by gel permeation chromatography (solvent: tetrahydrofuran, polystyrene conversion).
本発明の樹脂発泡体は、代表的には、樹脂組成物を発泡させて得られる。発泡の方法(気泡の形成方法)としては、物理的方法や化学的方法など、発泡成形に通常用いられる方法が採用できる。すなわち、樹脂発泡体は、代表的には、物理的方法により発泡して形成された発泡体(物理発泡体)であってもよいし、化学的方法により発泡して形成された発泡体(化学発泡体)であってもよい。物理的方法は、一般的に、空気や窒素等のガス成分をポリマー溶液に分散させて、機械的混合により気泡を形成させるもの(機械発泡体)である。化学的方法は、一般的に、ポリマーベースに添加された発泡剤の熱分解により生じたガスによりセルを形成し、発泡体を得る方法である。 A-2. Formation of Resin Foam The resin foam of the present invention is typically obtained by foaming a resin composition. As the method of foaming (method of forming cells), a method commonly used for foam molding, such as a physical method or a chemical method, can be employed. That is, the resin foam may typically be a foam formed by a physical method (physical foam) or a foam formed by a chemical method (chemical foam). foam). Physical methods generally involve dispersing a gaseous component such as air or nitrogen in a polymer solution and mechanically mixing to form cells (mechanical foam). The chemical method is generally a method in which cells are formed by gas generated by thermal decomposition of a foaming agent added to a polymer base to obtain a foam.
樹脂発泡体を形成させる一つの実施形態1としては、例えば、エマルション樹脂組成物(樹脂材料(ポリマー)などを含むエマルション)を機械的に発泡させて起泡化させる工程(工程A)を経て樹脂発泡体を形成する形態が挙げられる。起泡装置としては、例えば、高速せん断方式の装置、振動方式の装置、加圧ガスの吐出方式の装置などが挙げられる。これらの起泡装置の中でも、気泡径の微細化、大容量作製の観点から、高速せん断方式の装置が好ましい。樹脂発泡体を形成させるこの一つの実施形態1は、どのような樹脂組成物からの形成にも適用可能である。 <Embodiment 1 for forming a resin foam>
As one embodiment 1 for forming a resin foam, for example, an emulsion resin composition (emulsion containing a resin material (polymer), etc.) is mechanically foamed to foam the resin (step A). Forms that form foams are included. The foaming device includes, for example, a high-speed shearing device, a vibrating device, and a pressurized gas discharging device. Among these foaming apparatuses, a high-speed shearing apparatus is preferable from the viewpoint of miniaturization of the bubble diameter and production of a large volume. This one embodiment of forming a resin foam is applicable to forming from any resin composition.
樹脂発泡体を形成させる一つの実施形態2としては、樹脂組成物を発泡剤により発泡させて発泡体を形成する形態が挙げられる。発泡剤としては、発泡成形に通常用いられるものを使用でき、環境保護及び被発泡体に対する低汚染性の観点から、高圧の不活性ガスを用いることが好ましい。 <Embodiment 2 for forming a resin foam>
As one embodiment 2 of forming a resin foam, there is a form in which a foam is formed by foaming a resin composition with a foaming agent. As the foaming agent, those commonly used in foam molding can be used, and from the viewpoint of environmental protection and low contamination of the object to be foamed, it is preferable to use a high-pressure inert gas.
図1は、1つの実施形態による発泡部材の概略断面図である。発泡部材100は、樹脂発泡層10と、樹脂発泡層10の少なくとも一方の側に配置された粘着剤層20とを有する。樹脂発泡層10は、上記樹脂発泡体により構成される。 B. Foam Member FIG. 1 is a schematic cross-sectional view of a foam member according to one embodiment. The
(1)見かけ密度Y
樹脂発泡体の密度(見かけ密度)は、以下のように算出した。実施例・比較例で得られた樹脂発泡体を20mm×20mmサイズに打ち抜いて試験片とし、試験片の寸法をノギスで測定した。次に、試験片の重量を電子天秤にて測定した。そして、次式により算出した。
見かけ密度(g/cm3)=試験片の重量/試験片の体積 <Evaluation method>
(1) Apparent density Y
The density (apparent density) of the resin foam was calculated as follows. The resin foams obtained in Examples and Comparative Examples were punched out into 20 mm×20 mm size test pieces, and the dimensions of the test pieces were measured with vernier calipers. Next, the weight of the test piece was measured with an electronic balance. Then, it was calculated by the following formula.
Apparent density (g/cm 3 ) = weight of test piece/volume of test piece
JIS K 6767に記載されている樹脂発泡体の圧縮硬さ測定方法に準じて測定した。具体的には、実施例・比較例で得られた樹脂発泡体を30mm×30mmサイズに切り出して試験片とし、圧縮速度10mm/minで圧縮率が50%となるまで圧縮したときの応力(N)を単位面積(1cm2)当たりに換算して、50%圧縮荷重(N/cm2)とした。 (2) 50% Compressive Load Measured according to the method for measuring compression hardness of resin foam described in JIS K 6767. Specifically, the stress (N ) was converted to a unit area (1 cm 2 ) to obtain a 50% compressive load (N/cm 2 ).
樹脂発泡体を、カミソリ刃を用いて、TD(流れ方向に直交する方向)、かつ、樹脂発泡体の主面に対して垂直方向(厚み方向)に切断し、計測器としてデジタルマイクロスコープ(商品名「VHX-500」、キーエンス株式会社製)を用い、樹脂発泡体の切断面画像を取り込み、同計測器の解析ソフトを用いて、画像解析することにより、数平均気泡径(平均セル径)(μm)を求めた。なお、取り込んだ拡大画像の気泡数は400個程度であった。また、セル径の全データから標準偏差を計算し、以下の式を用いて変動係数を算出した。
変動係数=標準偏差/平均気泡径(平均セル径) (3) Average cell diameter (average cell diameter), coefficient of variation of cell diameter (cell diameter) The resin foam is treated with a razor blade in the TD (direction perpendicular to the flow direction), and the main surface of the resin foam Cut in the vertical direction (thickness direction), use a digital microscope (trade name "VHX-500", manufactured by Keyence Corporation) as a measuring instrument, capture the cut surface image of the resin foam, and use the measuring instrument The number average bubble diameter (average cell diameter) (μm) was determined by image analysis using analysis software. The number of bubbles in the captured enlarged image was about 400. In addition, the standard deviation was calculated from all the cell diameter data, and the coefficient of variation was calculated using the following formula.
Variation coefficient = standard deviation / average bubble diameter (average cell diameter)
温度23℃、湿度50%の環境下で測定を行った。100mm×100mmの打抜き刃型(加工刃(商品名「NCA07」、厚さ0.7mm、刃先角度43°、ナカヤマ社製))にて実施例・比較例で得られた樹脂発泡体を打抜き、打抜いた試料の寸法を測定した。また、測定端子の直径(φ)20mmである1/100ダイヤルゲージにて厚みを測定した。これらの値から実施例・比較例で得られた樹脂発泡体の体積を算出した。次に、実施例・比較例で得られた樹脂発泡体の重量を最小目盛り0.01g以上の上皿天秤にて測定した。これらの値より、実施例・比較例で得られた樹脂発泡体の気泡率(セル率)を算出した。 (4) Bubble rate (cell rate)
The measurement was performed in an environment with a temperature of 23°C and a humidity of 50%. A 100 mm × 100 mm punching blade (processing blade (trade name “NCA07”, thickness 0.7 mm, cutting edge angle 43°, manufactured by Nakayama Co., Ltd.)) is used to punch out the resin foams obtained in Examples and Comparative Examples, The dimensions of the punched samples were measured. Also, the thickness was measured with a 1/100 dial gauge having a measuring terminal diameter (φ) of 20 mm. From these values, the volumes of the resin foams obtained in Examples and Comparative Examples were calculated. Next, the weights of the resin foams obtained in Examples and Comparative Examples were measured with a balance with a minimum scale of 0.01 g or more. From these values, the void ratio (cell ratio) of the resin foams obtained in Examples and Comparative Examples was calculated.
温度23℃、湿度50%の環境下で、樹脂発泡体を水分中に沈め、その後の重量を測定し、その後、80℃のオーブンで十分に乾燥させた後、再度重量を測定した。当該重量測定により得られた含水量から、連続気泡の体積を求め、さらに、樹脂発泡体の体積に対する連続気泡の体積割合(連続気泡率)を求めた。 (5) Open cell rate Under an environment of temperature 23 ° C. and humidity 50%, the resin foam is submerged in water, then weighed, then sufficiently dried in an oven at 80 ° C., and weighed again. was measured. From the water content obtained by the weight measurement, the volume of the open cells was determined, and the volume ratio of the open cells to the volume of the resin foam (open cell ratio) was determined.
樹脂発泡体を、カミソリ刃を用いて、TD(流れ方向に直交する方向)、かつ、樹脂発泡体の主面に対して垂直方向(厚み方向)に切断した。
計測器としてデジタルマイクロスコープ(商品名「VHX-500」、キーエンス株式会社製)を用い、樹脂発泡体の切断面画像を取り込み、同計測器の解析ソフトを用いて、画像解析することにより、単位面積[mm2]当たりの気泡数を測定した。 (6) Cell Number Density The resin foam was cut with a razor blade in the TD (direction orthogonal to the flow direction) and in the direction (thickness direction) perpendicular to the main surface of the resin foam.
Using a digital microscope (trade name "VHX-500", manufactured by Keyence Corporation) as a measuring instrument, capturing an image of the cut surface of the resin foam and analyzing the image using the analysis software of the measuring instrument, the unit The number of air bubbles per area [mm 2 ] was measured.
樹脂発泡体を、カミソリ刃を用いて、TD(流れ方向に直交する方向)、かつ、樹脂発泡体の主面に対して垂直方向(厚み方向)に切断し、計測器としてデジタルマイクロスコープ(商品名「VHX-500」、キーエンス株式会社製)を用いて、樹脂発泡体の気泡部の拡大画像を取り込み、同計測器の解析ソフトを用いて、画像解析することにより、気泡壁(セル壁)の厚み(μm)を求めた。なお、取り込んだ拡大画像の気泡数は400個程度であった。 (7) Thickness of cell wall Using a razor blade, the resin foam is cut in TD (direction perpendicular to the flow direction) and perpendicular to the main surface of the resin foam (thickness direction), and measured. Using a digital microscope (trade name "VHX-500", manufactured by Keyence Corporation) as a device, an enlarged image of the bubble part of the resin foam is captured, and the image is analyzed using the analysis software of the same measuring device. , the thickness (μm) of the bubble wall (cell wall) was determined. The number of bubbles in the captured enlarged image was about 400.
アルミ板(0.5mm厚)で樹脂発泡体を挟み、約0.03mm厚みのスペーサーを設け、融点以上の温度を加えながらプレスし、バルク状態で厚み0.03mmのシートを得た。このシートを、計測器として、紫外・可視・近赤外分光光度計((島津製作所)製:SolidSpec-3700)を用いて、550nmの波長の光透過率を測定した。
なお、厚さ1.0mmの樹脂発泡体に満たない樹脂発泡体(実施例7)の場合は、当該樹脂発泡体を3層重ねた後にプレスして、バルク状態で厚み0.03mmのシートを得た。 (8) Light transmittance X in bulk state after pressing
A resin foam was sandwiched between aluminum plates (thickness 0.5 mm), a spacer of about 0.03 mm thick was provided, and pressed while applying a temperature above the melting point to obtain a bulk sheet with a thickness of 0.03 mm. The sheet was measured for light transmittance at a wavelength of 550 nm using an ultraviolet/visible/near-infrared spectrophotometer (manufactured by Shimadzu Corporation: SolidSpec-3700) as a measuring instrument.
In addition, in the case of a resin foam (Example 7) that is less than a resin foam with a thickness of 1.0 mm, three layers of the resin foam are stacked and then pressed to form a sheet with a thickness of 0.03 mm in a bulk state. Obtained.
樹脂発泡体に、樹脂発泡体に1000g/cm2の荷重を加えた状態で120秒間維持し、圧縮を解除し、解除してから0.5秒後の樹脂発泡体の厚み(圧縮状態を解除してから0.5秒後の厚み)を測定した。「圧縮状態を解除してから0.5秒後の厚み」と、荷重を加える前の樹脂発泡体の厚み(初期厚み)とから、下記の式により、厚み回復率(瞬間回復率)を求めた。
厚み回復率(%)={(圧縮状態を解除してから0.5秒後の厚み)/(初期厚み)}×100 (9) Thickness recovery rate (instantaneous recovery rate)
A load of 1000 g/cm 2 was applied to the resin foam and maintained for 120 seconds, and the compression was released. After 0.5 seconds, the thickness) was measured. The thickness recovery rate (instantaneous recovery rate) is obtained by the following formula from the "thickness 0.5 seconds after releasing the compressed state" and the thickness (initial thickness) of the resin foam before the load is applied. rice field.
Thickness recovery rate (%) = {(thickness 0.5 seconds after releasing the compressed state) / (initial thickness)} x 100
樹脂発泡体を金型(2枚の加工刃(商品名「NCA07」、厚さ0.7mm、刃先角度43°、2枚の加工刃の間隔10mm、(株)ナカヤマ製))を用いて、10mm×10mmサイズになるようにMD方向(流れ方向)、TD方向(流れ方向に直交する方向)にそれぞれ打ち抜き加工を行い、MD方向とTD方向の断面において厚み変化が大きい方の断面をマイクロスコープ(商品名「VHX-2000」キーエンス株式会社製)で観察した。画像から測定した端部の厚みと、打ち抜き加工前の厚みを用いて、下記式で加工後の厚み回復率を測定した。当該厚み回復率が大きいほど、打ち抜きにより形状変化が小さく、打ち抜き加工性に優れるということになる。
加工後の厚み回復率(%)=100×(1-(打ち抜き加工前の厚み-端部の厚み)/打ち抜き加工前の厚み) (10) Punching workability (10 mm × 10 mm)
Using a mold (two processing blades (trade name “NCA07”, thickness 0.7 mm, blade edge angle 43°, distance between two processing
Thickness recovery rate after processing (%) = 100 × (1 - (thickness before punching - thickness of edge) / thickness before punching)
樹脂発泡体を金型(2枚の加工刃(商品名「NCA07」、厚さ0.7mm、刃先角度43°、2枚の加工刃の間隔1mm(株)ナカヤマ製))を用いて、MD方向(流れ方向)に2枚の加工刃の間隔1mmにかつ長さ50mmに、かつ樹脂発泡体の主面に対して垂直方向(厚み方向)に打ち抜き加工を行い、断面をマイクロスコープ(商品名「VHX-2000」キーエンス株式会社製)で観察した。画像から測定した端部の厚みと、打ち抜き加工前の厚みを用いて、下記式で加工後の厚み回復率を測定した。当該厚み回復率が大きいほど、打ち抜きにより形状変化が小さく、打ち抜き加工性に優れるということになる。
加工後の厚み回復率(%)=100×(1-(打ち抜き加工前の厚み-端部の厚み)/打ち抜き加工前の厚み) (11) Punching workability (1 mm width)
The resin foam is molded using a mold (two processing blades (trade name “NCA07”, thickness 0.7 mm, blade angle 43 °, interval between two processing blades 1 mm, manufactured by Nakayama Co., Ltd.)). Punching is performed in the direction (flow direction) with a distance of 1 mm between the two processing blades and a length of 50 mm, and in the direction (thickness direction) perpendicular to the main surface of the resin foam. "VHX-2000" (manufactured by Keyence Corporation) was used for observation. Using the edge thickness measured from the image and the thickness before punching, the thickness recovery rate after processing was measured by the following formula. The larger the thickness recovery rate, the smaller the change in shape due to punching, and the better the punching workability.
Thickness recovery rate after processing (%) = 100 × (1 - (thickness before punching - thickness of edge) / thickness before punching)
樹脂発泡体を、計測器として、紫外・可視・近赤外分光光度計((島津製作所)製:SolidSpec-3700)を用いて、550nmの波長の光透過率を測定した。 (12) Transmittance of resin foam The resin foam is measured with an ultraviolet/visible/near-infrared spectrophotometer (manufactured by Shimadzu Corporation: SolidSpec-3700), and the light transmittance at a wavelength of 550 nm. was measured.
計測器として伸長粘度計(商品名「RH-7」、マルバーン社)を用いて、樹脂発泡体を構成する樹脂の融点よりも20℃高い温度にて、シリンダーにサンプル(樹脂発泡体を構成する樹脂(サイズ:5mm角))を投入し、7minかけて溶融状態にする。その後、せん断速度20mm/sの速度で溶融物を長さ10mm、口径1mmφのダイに押出し、得られた紐状の成型物の直径をデジタルノギス(商品名「CD67-s PM」、株式会社ミツトヨ社)を用いて測定し、下記の式からダイスウェル比を算出した。なお、発泡の前後それぞれについて、樹脂のダイスウェル比を測定した。
ダイスウェル比=成型物の直径(mm)/ダイ口径(mm) (13) Die swell ratio A sample ( A resin (size: 5 mm square) that constitutes the resin foam is put in and melted over 7 minutes. After that, the molten product was extruded into a die having a length of 10 mm and a diameter of 1 mmφ at a shear rate of 20 mm / s, and the diameter of the obtained string-shaped molded product was measured with a digital caliper (trade name “CD67-s PM”, Mitutoyo Co., Ltd. (Company), and the die swell ratio was calculated from the following formula. The die swell ratio of the resin was measured before and after foaming.
Die swell ratio = diameter of molding (mm) / diameter of die (mm)
計測器として伸長粘度計(商品名「RH-7」、マルバーン社)を用いて、樹脂発泡体を構成する樹脂の融点よりも20℃高い温度にて、シリンダーにサンプル(樹脂発泡体を構成する樹脂(サイズ:5mm角))を投入し、7minかけて溶融状態にする。その後、せん断速度20mm/sの速度で溶融物を長さ10mm、口径1mmφのダイに押出し、せん断粘度を測定した。なお、発泡の前後それぞれについて、樹脂のせん断粘度を測定した。 (14) Shear viscosity A sample (resin A resin (size: 5 mm square) that constitutes the foam is added and melted over 7 minutes. Thereafter, the melt was extruded through a die having a length of 10 mm and a diameter of 1 mmφ at a shear rate of 20 mm/s, and the shear viscosity was measured. The shear viscosity of the resin was measured before and after foaming.
ポリプロピレン(プロピレン単独重合体、MFR:0.4g/10分(230℃、荷重21.2N)、密度:0.90g/cm3、エチレン含量:0重量%、プロピレン含量:100重量%、重量平均分子量:64500、分子量分布:8.43)30重量部、ポリオレフィン系エラストマー(メルトフローレート(MFR):15g/10min、JIS A硬度:79°)46重量部、ポリオレフィン系エラストマー(メルトフローレート(MFR):2.2g/10min、JIS A硬度:69°)19重量部、水酸化マグネシウム(商品名「KISUMA 5P」協和化学工業製)10重量部、カーボン(商品名「旭♯35」旭カーボン株式会社製)10重量部、およびステアリン酸モノグリセリド1重量部を、日本製鋼所(JSW)社製の二軸混練機にて、200℃の温度で混練した後、ストランド状に押出し、水冷後ペレット状に成形した。このペレットを、日本製鋼所社製の単軸押出機に投入し、220℃の雰囲気下、13MPa(注入後12MPa)の圧力で、二酸化炭素ガスを注入した。二酸化炭素ガスは、樹脂100重量部に対して4.8重量部の割合で注入した。二酸化炭素ガスを十分飽和させた後、発泡に適した温度まで冷却後、ダイから押出して、シート状の樹脂発泡体aを得た。
さらに、スライサーを用いて薄膜化し、厚みが1.0mmの樹脂発泡体Aを得た。
得られた樹脂発泡体Aを、上記評価に供した。結果を表1に示す。 [Example 1]
Polypropylene (propylene homopolymer, MFR: 0.4 g/10 min (230°C, load 21.2 N), density: 0.90 g/cm 3 , ethylene content: 0 wt%, propylene content: 100 wt%, weight average Molecular weight: 64500, molecular weight distribution: 8.43) 30 parts by weight, polyolefin elastomer (melt flow rate (MFR): 15 g/10 min, JIS A hardness: 79°) 46 parts by weight, polyolefin elastomer (melt flow rate (MFR ): 2.2 g / 10 min, JIS A hardness: 69 °) 19 parts by weight, magnesium hydroxide (trade name “KISUMA 5P” manufactured by Kyowa Chemical Industry) 10 parts by weight, carbon (trade name “Asahi # 35” Asahi Carbon Co., Ltd. Company) 10 parts by weight and 1 part by weight of stearic acid monoglyceride are kneaded at a temperature of 200 ° C. in a twin-screw kneader manufactured by Japan Steel Works (JSW), extruded into strands, water-cooled and pelletized. molded into The pellets were put into a single-screw extruder manufactured by Japan Steel Works, Ltd., and carbon dioxide gas was injected under an atmosphere of 220° C. and a pressure of 13 MPa (12 MPa after injection). Carbon dioxide gas was injected at a rate of 4.8 parts by weight with respect to 100 parts by weight of the resin. After sufficiently saturating the carbon dioxide gas, it was cooled to a temperature suitable for foaming, and then extruded from a die to obtain a sheet-like resin foam a.
Furthermore, it was thinned using a slicer to obtain a resin foam A having a thickness of 1.0 mm.
The obtained resin foam A was subjected to the above evaluation. Table 1 shows the results.
ポリプロピレン(プロピレン単独重合体、MFR:0.4g/10分(230℃、荷重21.2N)、密度:0.90g/cm3、エチレン含量:0重量%、プロピレン含量:100重量%)35重量部、ポリオレフィン系エラストマー(メルトフローレート(MFR):15g/10min、JIS A硬度:79°)42重量部、ポリオレフィン系エラストマー(メルトフローレート(MFR):2.2g/10min、JIS A硬度:69°)18重量部、水酸化マグネシウム(商品名「KISUMA 5P」協和化学工業製)10重量部、カーボン(商品名「旭♯35」旭カーボン株式会社製)10重量部、およびステアリン酸モノグリセリド1重量部を、日本製鋼所(JSW)社製の二軸混練機にて、200℃の温度で混練した後、ストランド状に押出し、水冷後ペレット状に成形した。このペレットを、日本製鋼所社製の単軸押出機に投入し、220℃の雰囲気下、13MPa(注入後12MPa)の圧力で、二酸化炭素ガスを注入した。二酸化炭素ガスは、樹脂100重量部に対して4.8重量部の割合で注入した。二酸化炭素ガスを十分飽和させた後、発泡に適した温度まで冷却後、ダイから押出して、シート状の樹脂発泡体bを得た。
さらに、スライサーを用いて薄膜化し、厚みが1.0mmの樹脂発泡体Bを得た。
得られた樹脂発泡体Bを、上記評価に供した。結果を表1に示す。 [Example 2]
Polypropylene (propylene homopolymer, MFR: 0.4 g/10 min (230°C, load 21.2 N), density: 0.90 g/cm 3 , ethylene content: 0 wt%, propylene content: 100 wt%) 35 weight part, polyolefin elastomer (melt flow rate (MFR): 15 g/10 min, JIS A hardness: 79°) 42 parts by weight, polyolefin elastomer (melt flow rate (MFR): 2.2 g/10 min, JIS A hardness: 69 °) 18 parts by weight, 10 parts by weight of magnesium hydroxide (trade name "KISUMA 5P" manufactured by Kyowa Chemical Industry Co., Ltd.), 10 parts by weight of carbon (trade name "Asahi #35" manufactured by Asahi Carbon Co., Ltd.), and 1 weight part of stearic acid monoglyceride The parts were kneaded at a temperature of 200° C. using a twin-screw kneader manufactured by Japan Steel Works (JSW), extruded into strands, cooled with water, and formed into pellets. The pellets were put into a single-screw extruder manufactured by Japan Steel Works, Ltd., and carbon dioxide gas was injected under an atmosphere of 220° C. and a pressure of 13 MPa (12 MPa after injection). Carbon dioxide gas was injected at a rate of 4.8 parts by weight with respect to 100 parts by weight of the resin. After sufficiently saturating the carbon dioxide gas, it was cooled to a temperature suitable for foaming, and then extruded through a die to obtain a sheet-like resin foam b.
Furthermore, it was thinned using a slicer to obtain a resin foam B having a thickness of 1.0 mm.
The obtained resin foam B was subjected to the above evaluation. Table 1 shows the results.
二酸化炭素ガスの注入量を、樹脂100重量部に対して4.5重量部の割合としたこと以外は、実施例2と同様にして、樹脂発泡体cを得た。
さらに、スライサーを用いて薄膜化し、厚みが1.0mmの樹脂発泡体Cを得た。
得られた樹脂発泡体Cを、上記評価に供した。結果を表1に示す。 [Example 3]
A resin foam c was obtained in the same manner as in Example 2, except that the injection amount of carbon dioxide gas was 4.5 parts by weight with respect to 100 parts by weight of the resin.
Furthermore, it was thinned using a slicer to obtain a resin foam C having a thickness of 1.0 mm.
The obtained resin foam C was subjected to the above evaluation. Table 1 shows the results.
二酸化炭素ガスの注入量を、樹脂100重量部に対して4.2重量部の割合としたこと以外は、実施例2と同様にして、樹脂発泡体dを得た。
さらに、スライサーを用いて薄膜化し、厚みが1.0mmの樹脂発泡体Dを得た。
得られた樹脂発泡体Dを、上記評価に供した。結果を表1に示す。 [Example 4]
A resin foam d was obtained in the same manner as in Example 2, except that the injection amount of carbon dioxide gas was 4.2 parts by weight with respect to 100 parts by weight of the resin.
Furthermore, it was thinned using a slicer to obtain a resin foam D having a thickness of 1.0 mm.
The obtained resin foam D was subjected to the above evaluation. Table 1 shows the results.
ポリプロピレン(プロピレン単独重合体、MFR:0.4g/10分(230℃、荷重21.2N)、密度:0.90g/cm3、エチレン含量:0重量%、プロピレン含量:100重量%)40重量部、ポリオレフィン系エラストマー(メルトフローレート(MFR):15g/10min、JIS A硬度:79°)39重量部、ポリオレフィン系エラストマー(メルトフローレート(MFR):2.2g/10min、JIS A硬度:69°)16重量部、水酸化マグネシウム(商品名「KISUMA 5P」協和化学工業製)10重量部、カーボン(商品名「旭♯35」旭カーボン株式会社製)10重量部、およびステアリン酸モノグリセリド1重量部を、日本製鋼所(JSW)社製の二軸混練機にて、200℃の温度で混練した後、ストランド状に押出し、水冷後ペレット状に成形した。このペレットを、日本製鋼所社製の単軸押出機に投入し、220℃の雰囲気下、13MPa(注入後12MPa)の圧力で、二酸化炭素ガスを注入した。二酸化炭素ガスは、樹脂100重量部に対して4.5重量部の割合で注入した。二酸化炭素ガスを十分飽和させた後、発泡に適した温度まで冷却後、ダイから押出して、シート状の樹脂発泡体eを得た。
さらに、スライサーを用いて薄膜化し、厚みが1.0mmの樹脂発泡体Eを得た。
得られた樹脂発泡体Eを、上記評価に供した。結果を表1に示す。 [Example 5]
Polypropylene (propylene homopolymer, MFR: 0.4 g/10 min (230° C., load 21.2 N), density: 0.90 g/cm 3 , ethylene content: 0% by weight, propylene content: 100% by weight) 40 weight part, polyolefin elastomer (melt flow rate (MFR): 15 g/10 min, JIS A hardness: 79°) 39 parts by weight, polyolefin elastomer (melt flow rate (MFR): 2.2 g/10 min, JIS A hardness: 69 °) 16 parts by weight, magnesium hydroxide (trade name “KISUMA 5P” manufactured by Kyowa Chemical Industry Co., Ltd.) 10 parts by weight, carbon (trade name “Asahi #35” manufactured by Asahi Carbon Co., Ltd.) 10 parts by weight, and stearic acid monoglyceride 1 weight The parts were kneaded at a temperature of 200° C. using a twin-screw kneader manufactured by Japan Steel Works (JSW), extruded into strands, cooled with water, and formed into pellets. The pellets were put into a single-screw extruder manufactured by Japan Steel Works, Ltd., and carbon dioxide gas was injected under an atmosphere of 220° C. and a pressure of 13 MPa (12 MPa after injection). Carbon dioxide gas was injected at a rate of 4.5 parts by weight with respect to 100 parts by weight of the resin. After sufficiently saturating the carbon dioxide gas, it was cooled to a temperature suitable for foaming, and then extruded through a die to obtain a sheet-like resin foam e.
Furthermore, it was thinned using a slicer to obtain a resin foam E having a thickness of 1.0 mm.
The obtained resin foam E was subjected to the above evaluation. Table 1 shows the results.
ポリプロピレン(プロピレン単独重合体、MFR:0.5g/10分(230℃、荷重21.2N)、密度:0.90g/cm3、エチレン含量:0重量%、プロピレン含量:100重量%、重量平均分子量:54500、分子量分布:9.83)40重量部、ポリオレフィン系エラストマー(メルトフローレート(MFR):15g/10min、JIS A硬度:79°)39重量部、ポリオレフィン系エラストマー(メルトフローレート(MFR):2.2g/10min、JIS A硬度:69°)16重量部、水酸化マグネシウム(商品名「KISUMA 5P」協和化学工業製)10重量部、カーボン(商品名「旭♯35」旭カーボン株式会社製)10重量部、およびステアリン酸モノグリセリド1重量部を、日本製鋼所(JSW)社製の二軸混練機にて、200℃の温度で混練した後、ストランド状に押出し、水冷後ペレット状に成形した。このペレットを、日本製鋼所社製の単軸押出機に投入し、220℃の雰囲気下、13MPa(注入後12MPa)の圧力で、二酸化炭素ガスを注入した。二酸化炭素ガスは、樹脂100重量部に対して4.5重量部の割合で注入した。二酸化炭素ガスを十分飽和させた後、発泡に適した温度まで冷却後、ダイから押出して、シート状の樹脂発泡体fを得た。
さらに、スライサーを用いて薄膜化し、厚みが1.0mmの樹脂発泡体Fを得た。
得られた樹脂発泡体Fを、上記評価に供した。結果を表1に示す。 [Example 6]
Polypropylene (propylene homopolymer, MFR: 0.5 g/10 min (230°C, load 21.2 N), density: 0.90 g/cm 3 , ethylene content: 0 wt%, propylene content: 100 wt%, weight average Molecular weight: 54500, molecular weight distribution: 9.83) 40 parts by weight, polyolefin elastomer (melt flow rate (MFR): 15 g/10 min, JIS A hardness: 79°) 39 parts by weight, polyolefin elastomer (melt flow rate (MFR ): 2.2 g / 10 min, JIS A hardness: 69 °) 16 parts by weight, magnesium hydroxide (trade name “KISUMA 5P” manufactured by Kyowa Chemical Industry) 10 parts by weight, carbon (trade name “Asahi #35” Asahi Carbon Co., Ltd. Company) 10 parts by weight and 1 part by weight of stearic acid monoglyceride are kneaded at a temperature of 200 ° C. in a twin-screw kneader manufactured by Japan Steel Works (JSW), extruded into strands, water-cooled and pelletized. molded into The pellets were put into a single-screw extruder manufactured by Japan Steel Works, Ltd., and carbon dioxide gas was injected under an atmosphere of 220° C. and a pressure of 13 MPa (12 MPa after injection). Carbon dioxide gas was injected at a rate of 4.5 parts by weight with respect to 100 parts by weight of the resin. After sufficiently saturating the carbon dioxide gas, it was cooled to a temperature suitable for foaming, and extruded through a die to obtain a sheet-like resin foam f.
Furthermore, it was thinned using a slicer to obtain a resin foam F having a thickness of 1.0 mm.
The obtained resin foam F was subjected to the above evaluation. Table 1 shows the results.
二酸化炭素ガスの注入量を、樹脂100重量部に対して4.2重量部の割合としたこと以外は、実施例2と同様にして、樹脂発泡体gを得た。
さらに、スライサーを用いて薄膜化し、厚みが0.3mmの樹脂発泡体を得た。さらに、一方のロールが230℃に加熱された一対のロールにおけるロール間(ロールとロールの間の隙間)に、上記樹脂発泡体を通過させて、厚みが0.20mmの樹脂発泡体Eを得た。なお、ロール間のギャップ(隙間)は、厚みが0.20mmの樹脂発泡体Gが得られるように設定した。
得られた樹脂発泡体Gを、上記評価に供した。結果を表1に示す。 [Example 7]
A resin foam g was obtained in the same manner as in Example 2, except that the injection amount of carbon dioxide gas was 4.2 parts by weight with respect to 100 parts by weight of the resin.
Furthermore, it was thinned using a slicer to obtain a resin foam having a thickness of 0.3 mm. Furthermore, the resin foam is passed through a pair of rolls, one of which is heated to 230 ° C. (the gap between the rolls) to obtain a resin foam E having a thickness of 0.20 mm. rice field. The gap (clearance) between the rolls was set so as to obtain a resin foam G having a thickness of 0.20 mm.
The obtained resin foam G was subjected to the above evaluation. Table 1 shows the results.
ポリプロピレン(プロピレン単独重合体、MFR:0.4g/10分(230℃、荷重21.2N)、密度:0.90g/cm3、エチレン含量:0重量%、プロピレン含量:100重量%、重量平均分子量:64500、分子量分布:8.43)45重量部、ポリプロピレン(プロピレン単独重合体、MFR:0.5g/10分(230℃、荷重21.2N)、密度:0.90g/cm3、エチレン含量:0重量%、プロピレン含量:100重量%、重量平均分子量:54500、分子量分布:9.83)20重量部、ポリオレフィン系エラストマー(メルトフローレート(MFR):15g/10min、JIS A硬度:79°)25重量部、ポリオレフィン系エラストマー(メルトフローレート(MFR):2.2g/10min、JIS A硬度:69°)10重量部、水酸化マグネシウム(商品名「KISUMA 5P」協和化学工業製)120重量部、カーボン(商品名「旭♯35」旭カーボン株式会社製)10重量部、およびステアリン酸モノグリセリド1重量部を、日本製鋼所(JSW)社製の二軸混練機にて、200℃の温度で混練した後、ストランド状に押出し、水冷後ペレット状に成形した。このペレットを、日本製鋼所社製の単軸押出機に投入し、220℃の雰囲気下、13MPa(注入後12MPa)の圧力で、二酸化炭素ガスを注入した。二酸化炭素ガスは、樹脂100重量部に対して4.2重量部の割合で注入した。二酸化炭素ガスを十分飽和させた後、発泡に適した温度まで冷却後、ダイから押出して、シート状の樹脂発泡体hを得た。
さらに、スライサーを用いて薄膜化し、厚みが1.0mmの樹脂発泡体Hを得た。
得られた樹脂発泡体Hを、上記評価に供した。結果を表1に示す。 [Example 8]
Polypropylene (propylene homopolymer, MFR: 0.4 g/10 min (230°C, load 21.2 N), density: 0.90 g/cm 3 , ethylene content: 0 wt%, propylene content: 100 wt%, weight average Molecular weight: 64500, molecular weight distribution: 8.43) 45 parts by weight, polypropylene (propylene homopolymer, MFR: 0.5 g/10 min (230°C, load 21.2 N), density: 0.90 g/cm 3 , ethylene content: 0% by weight, propylene content: 100% by weight, weight average molecular weight: 54500, molecular weight distribution: 9.83) 20 parts by weight, polyolefin elastomer (melt flow rate (MFR): 15 g/10 min, JIS A hardness: 79 °) 25 parts by weight, polyolefin elastomer (melt flow rate (MFR): 2.2 g/10 min, JIS A hardness: 69 °) 10 parts by weight, magnesium hydroxide (trade name “KISUMA 5P” manufactured by Kyowa Chemical Industry) 120 Parts by weight, 10 parts by weight of carbon (trade name “Asahi #35” manufactured by Asahi Carbon Co., Ltd.), and 1 part by weight of stearic acid monoglyceride are mixed with a twin-screw kneader manufactured by Japan Steel Works (JSW) at 200 ° C. After kneading at temperature, the mixture was extruded into strands, cooled with water, and formed into pellets. The pellets were put into a single-screw extruder manufactured by Japan Steel Works, Ltd., and carbon dioxide gas was injected under an atmosphere of 220° C. and a pressure of 13 MPa (12 MPa after injection). Carbon dioxide gas was injected at a rate of 4.2 parts by weight with respect to 100 parts by weight of the resin. After sufficiently saturating the carbon dioxide gas, it was cooled to a temperature suitable for foaming, and then extruded through a die to obtain a sheet-like resin foam h.
Furthermore, it was thinned using a slicer to obtain a resin foam H having a thickness of 1.0 mm.
The obtained resin foam H was subjected to the above evaluation. Table 1 shows the results.
ポリプロピレン(プロピレン単独重合体、MFR:0.4g/10分(230℃、荷重21.2N)、密度:0.90g/cm3、エチレン含量:0重量%、プロピレン含量:100重量%、重量平均分子量:108000、分子量分布:4.93)65重量部、ポリオレフィン系エラストマー(メルトフローレート(MFR):15g/10min、JIS A硬度:79°)35重量部、水酸化マグネシウム(商品名「KISUMA 5P」協和化学工業製)5重量部、カーボン(商品名「旭♯35」旭カーボン株式会社製)10重量部、およびステアリン酸モノグリセリド1重量部を、日本製鋼所(JSW)社製の二軸混練機にて、200℃の温度で混練した後、ストランド状に押出し、水冷後ペレット状に成形した。このペレットを、日本製鋼所社製の単軸押出機に投入し、220℃の雰囲気下、13MPa(注入後12MPa)の圧力で、二酸化炭素ガスを注入した。二酸化炭素ガスは、樹脂100重量部に対して4.5重量部の割合で注入した。二酸化炭素ガスを十分飽和させた後、発泡に適した温度まで冷却後、ダイから押出して、シート状の樹脂発泡体iを得た。
さらに、スライサーを用いて薄膜化し、厚みが1.0mmの樹脂発泡体Iを得た。
得られた樹脂発泡体Iを、上記評価に供した。結果を表1に示す。 [Comparative Example 1]
Polypropylene (propylene homopolymer, MFR: 0.4 g/10 min (230°C, load 21.2 N), density: 0.90 g/cm 3 , ethylene content: 0 wt%, propylene content: 100 wt%, weight average Molecular weight: 108,000, molecular weight distribution: 4.93) 65 parts by weight, polyolefin elastomer (melt flow rate (MFR): 15 g/10 min, JIS A hardness: 79°) 35 parts by weight, magnesium hydroxide (trade name "KISUMA 5P ” manufactured by Kyowa Chemical Industry Co., Ltd.) 5 parts by weight, carbon (trade name “Asahi #35” manufactured by Asahi Carbon Co., Ltd.) 10 parts by weight, and 1 part by weight of stearic acid monoglyceride are biaxially kneaded by Japan Steel Works (JSW). After kneading at a temperature of 200° C. in a machine, the mixture was extruded into strands, cooled with water, and formed into pellets. The pellets were put into a single-screw extruder manufactured by Japan Steel Works, Ltd., and carbon dioxide gas was injected under an atmosphere of 220° C. and a pressure of 13 MPa (12 MPa after injection). Carbon dioxide gas was injected at a rate of 4.5 parts by weight with respect to 100 parts by weight of the resin. After sufficiently saturating the carbon dioxide gas, it was cooled to a temperature suitable for foaming, and then extruded through a die to obtain a sheet-like resin foam i.
Furthermore, it was thinned using a slicer to obtain a resin foam I having a thickness of 1.0 mm.
The obtained resin foam I was subjected to the above evaluation. Table 1 shows the results.
ポリプロピレン(プロピレン単独重合体、MFR:0.4g/10分(230℃、荷重21.2N)、密度:0.90g/cm3、エチレン含量:0重量%、プロピレン含量:100重量%、重量平均分子量:64500、分子量分布:8.43)45重量部、ポリオレフィン系エラストマー(メルトフローレート(MFR):15g/10min、JIS A硬度:79°)55重量部、水酸化マグネシウム(商品名「KISUMA 5P」協和化学工業製)5重量部、カーボン(商品名「旭♯35」旭カーボン株式会社製)10重量部、およびステアリン酸モノグリセリド1重量部を、日本製鋼所(JSW)社製の二軸混練機にて、200℃の温度で混練した後、ストランド状に押出し、水冷後ペレット状に成形した。このペレットを、日本製鋼所社製の単軸押出機に投入し、220℃の雰囲気下、13MPa(注入後12MPa)の圧力で、二酸化炭素ガスを注入した。二酸化炭素ガスは、樹脂100重量部に対して4.5重量部の割合で注入した。二酸化炭素ガスを十分飽和させた後、発泡に適した温度まで冷却後、ダイから押出して、シート状の樹脂発泡体jを得た。
さらに、スライサーを用いて薄膜化し、厚みが1.0mmの樹脂発泡体Jを得た。
得られた樹脂発泡体Jを、上記評価に供した。結果を表1に示す。 [Comparative Example 2]
Polypropylene (propylene homopolymer, MFR: 0.4 g/10 min (230°C, load 21.2 N), density: 0.90 g/cm 3 , ethylene content: 0 wt%, propylene content: 100 wt%, weight average Molecular weight: 64,500, molecular weight distribution: 8.43) 45 parts by weight, polyolefin elastomer (melt flow rate (MFR): 15 g/10 min, JIS A hardness: 79°) 55 parts by weight, magnesium hydroxide (trade name "KISUMA 5P ” manufactured by Kyowa Chemical Industry Co., Ltd.) 5 parts by weight, carbon (trade name “Asahi #35” manufactured by Asahi Carbon Co., Ltd.) 10 parts by weight, and 1 part by weight of stearic acid monoglyceride are biaxially kneaded by Japan Steel Works (JSW). After kneading at a temperature of 200° C. in a machine, the mixture was extruded into strands, cooled with water, and formed into pellets. The pellets were put into a single-screw extruder manufactured by Japan Steel Works, Ltd., and carbon dioxide gas was injected under an atmosphere of 220° C. and a pressure of 13 MPa (12 MPa after injection). Carbon dioxide gas was injected at a rate of 4.5 parts by weight with respect to 100 parts by weight of the resin. After sufficiently saturating the carbon dioxide gas, it was cooled to a temperature suitable for foaming, and then extruded through a die to obtain a sheet-like resin foam j.
Furthermore, it was thinned using a slicer to obtain a resin foam J having a thickness of 1.0 mm.
The obtained resin foam J was subjected to the above evaluation. Table 1 shows the results.
ポリウレタンを主成分とする樹脂発泡体(見かけ密度:0.15g/cm3、50%圧縮荷重1.0N/cm2、厚み:1.0mm)を準備した。当該樹脂発泡体を上記評価に供した。結果を表1に示す。 [Comparative Example 3]
A resin foam (apparent density: 0.15 g/cm 3 , 50% compression load: 1.0 N/cm 2 , thickness: 1.0 mm) containing polyurethane as a main component was prepared. The resin foam was subjected to the above evaluation. Table 1 shows the results.
ポリウレタンを主成分とする樹脂発泡体(見かけ密度:0.25g/cm3、50%圧縮荷重2.1N/cm2、厚み:1.0mm)を準備した。当該樹脂発泡体を上記評価に供した。結果を表1に示す。 [Comparative Example 4]
A resin foam containing polyurethane as a main component (apparent density: 0.25 g/cm 3 , 50% compression load: 2.1 N/cm 2 , thickness: 1.0 mm) was prepared. The resin foam was subjected to the above evaluation. Table 1 shows the results.
10 樹脂発泡層(樹脂発泡体)
20 粘着剤層 100
20 adhesive layer
Claims (12)
- 気泡構造を有し、見かけ密度が0.03g/cm3以上の樹脂発泡体であって、
プレス後のバルク状態における光透過率X(%)と、見かけ密度Y(g/cm3)とが、下記式(1)の関係を満たし、
100Y-4X>3 ・・・(1)
該樹脂発泡体に1000g/cm2の荷重を加えた状態で120秒間維持した後の厚み回復率が、80%以上である、
樹脂発泡体。 A resin foam having a cell structure and an apparent density of 0.03 g/cm 3 or more,
The light transmittance X (%) in the bulk state after pressing and the apparent density Y (g/cm 3 ) satisfy the relationship of the following formula (1),
100Y-4X>3 (1)
The thickness recovery rate after maintaining a load of 1000 g/cm 2 on the resin foam for 120 seconds is 80% or more.
Resin foam. - プレス後のバルク状態における前記光透過率Xが、2.0%以下である、請求項1に記載の樹脂発泡体。 The resin foam according to claim 1, wherein the light transmittance X in the bulk state after pressing is 2.0% or less.
- 見かけ密度Yが、0.4g/cm3未満である、請求項1に記載の樹脂発泡体。 The resin foam according to Claim 1, wherein the apparent density Y is less than 0.4 g/ cm3 .
- 気泡数密度が、30個/mm2以上である、請求項1に記載の樹脂発泡体。 The resin foam according to claim 1, which has a cell number density of 30 cells/ mm2 or more.
- 気泡径の変動係数が、0.5以下である、請求項1に記載の樹脂発泡体。 The resin foam according to claim 1, wherein the coefficient of variation of cell diameter is 0.5 or less.
- 平均気泡径が、10μm~200μmである、請求項1に記載の樹脂発泡体。 The resin foam according to claim 1, which has an average cell diameter of 10 μm to 200 μm.
- 気泡率が、30%以上である、請求項1に記載の樹脂発泡体。 The resin foam according to claim 1, which has a void content of 30% or more.
- 50%圧縮荷重が、20N/cm2以下である、請求項1に記載の樹脂発泡体。 The resin foam according to claim 1, having a 50% compression load of 20 N/cm 2 or less.
- ポリオレフィン系樹脂を含む、請求項1に記載の樹脂発泡体。 The resin foam according to claim 1, which contains a polyolefin resin.
- 前記ポリオレフィン系樹脂が、ポリオレフィン系エラストマー以外のポリオレフィンとポリオレフィン系エラストマーの混合物である、請求項9に記載の樹脂発泡体。 The resin foam according to claim 9, wherein the polyolefin resin is a mixture of a polyolefin other than a polyolefin elastomer and a polyolefin elastomer.
- 片面または両面に、熱溶融層を有する、請求項1に記載の樹脂発泡体。 The resin foam according to claim 1, which has a heat-melting layer on one side or both sides.
- 樹脂発泡層と、該樹脂発泡層の少なくとも一方の側に配置された粘着剤層を有し、
該樹脂発泡層が、請求項1に記載の樹脂発泡体である、
発泡部材。
Having a resin foam layer and an adhesive layer disposed on at least one side of the resin foam layer,
The resin foam layer is the resin foam according to claim 1,
foam material.
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