JP2007204539A - Expandable rubber composition - Google Patents
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- JP2007204539A JP2007204539A JP2006022674A JP2006022674A JP2007204539A JP 2007204539 A JP2007204539 A JP 2007204539A JP 2006022674 A JP2006022674 A JP 2006022674A JP 2006022674 A JP2006022674 A JP 2006022674A JP 2007204539 A JP2007204539 A JP 2007204539A
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- 229920001971 elastomer Polymers 0.000 title claims abstract description 56
- 239000005060 rubber Substances 0.000 title claims abstract description 56
- 239000000203 mixture Substances 0.000 title claims abstract description 32
- 238000000465 moulding Methods 0.000 claims abstract description 14
- 239000004088 foaming agent Substances 0.000 claims abstract description 12
- 229920001084 poly(chloroprene) Polymers 0.000 claims abstract description 11
- 229920005992 thermoplastic resin Polymers 0.000 claims abstract description 11
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 claims description 23
- 238000004073 vulcanization Methods 0.000 claims description 15
- 229920000642 polymer Polymers 0.000 claims description 11
- 229920000573 polyethylene Polymers 0.000 claims description 5
- 239000011358 absorbing material Substances 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- 229920003048 styrene butadiene rubber Polymers 0.000 claims description 4
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 claims description 2
- 238000013329 compounding Methods 0.000 abstract description 6
- 241001441571 Hiodontidae Species 0.000 description 12
- 238000002156 mixing Methods 0.000 description 10
- 238000005187 foaming Methods 0.000 description 9
- 239000003795 chemical substances by application Substances 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 239000005011 phenolic resin Substances 0.000 description 6
- 229920005989 resin Polymers 0.000 description 6
- 239000011347 resin Substances 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 238000003860 storage Methods 0.000 description 5
- -1 azo compound Chemical class 0.000 description 4
- 238000004898 kneading Methods 0.000 description 4
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 description 3
- 229920001577 copolymer Polymers 0.000 description 3
- 229920001568 phenolic resin Polymers 0.000 description 3
- 229920001187 thermosetting polymer Polymers 0.000 description 3
- 239000004264 Petrolatum Substances 0.000 description 2
- 235000021355 Stearic acid Nutrition 0.000 description 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 2
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 2
- 230000003712 anti-aging effect Effects 0.000 description 2
- 230000003139 buffering effect Effects 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000006229 carbon black Substances 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 239000006260 foam Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 150000002832 nitroso derivatives Chemical class 0.000 description 2
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 2
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 2
- 229940066842 petrolatum Drugs 0.000 description 2
- 235000019271 petrolatum Nutrition 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000008117 stearic acid Substances 0.000 description 2
- 150000003440 styrenes Chemical class 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 125000000472 sulfonyl group Chemical group *S(*)(=O)=O 0.000 description 2
- 239000011701 zinc Substances 0.000 description 2
- 229910052725 zinc Inorganic materials 0.000 description 2
- 239000011787 zinc oxide Substances 0.000 description 2
- 235000014692 zinc oxide Nutrition 0.000 description 2
- QTWJRLJHJPIABL-UHFFFAOYSA-N 2-methylphenol;3-methylphenol;4-methylphenol Chemical compound CC1=CC=C(O)C=C1.CC1=CC=CC(O)=C1.CC1=CC=CC=C1O QTWJRLJHJPIABL-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- MWRWFPQBGSZWNV-UHFFFAOYSA-N Dinitrosopentamethylenetetramine Chemical compound C1N2CN(N=O)CN1CN(N=O)C2 MWRWFPQBGSZWNV-UHFFFAOYSA-N 0.000 description 1
- 229920000459 Nitrile rubber Polymers 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 229920000122 acrylonitrile butadiene styrene Polymers 0.000 description 1
- 150000001540 azides Chemical class 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- VJRITMATACIYAF-UHFFFAOYSA-N benzenesulfonohydrazide Chemical compound NNS(=O)(=O)C1=CC=CC=C1 VJRITMATACIYAF-UHFFFAOYSA-N 0.000 description 1
- 229930003836 cresol Natural products 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- HQQADJVZYDDRJT-UHFFFAOYSA-N ethene;prop-1-ene Chemical group C=C.CC=C HQQADJVZYDDRJT-UHFFFAOYSA-N 0.000 description 1
- 239000005038 ethylene vinyl acetate Substances 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000010097 foam moulding Methods 0.000 description 1
- 229920001821 foam rubber Polymers 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 238000010068 moulding (rubber) Methods 0.000 description 1
- ALIFPGGMJDWMJH-UHFFFAOYSA-N n-phenyldiazenylaniline Chemical compound C=1C=CC=CC=1NN=NC1=CC=CC=C1 ALIFPGGMJDWMJH-UHFFFAOYSA-N 0.000 description 1
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 239000004848 polyfunctional curative Substances 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 239000012744 reinforcing agent Substances 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000010057 rubber processing Methods 0.000 description 1
- 125000005147 toluenesulfonyl group Chemical group C=1(C(=CC=CC1)S(=O)(=O)*)C 0.000 description 1
- NDLIRBZKZSDGSO-UHFFFAOYSA-N tosyl azide Chemical compound CC1=CC=C(S(=O)(=O)[N-][N+]#N)C=C1 NDLIRBZKZSDGSO-UHFFFAOYSA-N 0.000 description 1
- 239000006097 ultraviolet radiation absorber Substances 0.000 description 1
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- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
Description
本発明は、発泡ゴム組成物に関し、さらに詳しくは、気泡の潰れを防止する高硬度化を、成形加工性を向上しながら可能にする発泡ゴム組成物に関する。 The present invention relates to a foamed rubber composition, and more particularly, to a foamed rubber composition that makes it possible to increase hardness while preventing foam collapse while improving moldability.
クロロプレンゴムは、難燃性、耐油性などに優れているため、これに独立気泡を含むようにした発泡ゴムは、自動車部品等の工業用部品として、さらに、吸音材や緩衝材などの用途に広く使用されている。発泡ゴムの成形は、発泡剤を配合した未加硫ゴムを金型に入れ、加熱下で加硫・発泡成形する方法が一般的である（例えば、特許文献１参照）。 Since chloroprene rubber is excellent in flame retardancy and oil resistance, foamed rubber containing closed cells is used for industrial parts such as automobile parts, and for applications such as sound absorbing materials and cushioning materials. Widely used. In general, foamed rubber is molded by placing unvulcanized rubber containing a foaming agent in a mold and vulcanizing and foaming under heating (see, for example, Patent Document 1).
しかし、このようにして得た発泡ゴムは高い圧力が負荷される苛酷な条件下に使用される用途では、内部の気泡が潰れて所期の性能が得られなくなるという問題がある。 However, the foamed rubber obtained in this way has a problem that the desired performance cannot be obtained due to the collapse of the internal bubbles in an application used under severe conditions where high pressure is applied.
この対策としては加硫後の発泡ゴムを高硬度化することが有効である。従来、ゴムを高硬度化する方法としては、未加硫ゴムにカーボンブラックや充填剤を多量に配合したり、フェーノール樹脂又はエポキシ樹脂などの熱硬化性樹脂を配合する方法がある。しかし、これらの方法は、ゴムが焼けやすく、押出工程で加熱されると一層加硫が進みやすくなり、貯蔵安定性に欠けるという欠点がある。特に、フェノール樹脂を配合する方法（例えば、非特許文献１参照）では、成形時にフェノール樹脂自身が３次元網目架橋構造を形成するためムーニースコーチタイムが４〜６分程度と極めて短いために、成形作業時間の制約が大きく、成形作業性が劣るという問題があった。
本発明の目的は、気泡の潰れを防止する高硬度化を、成形加工性を向上しながら可能にする発泡ゴム組成物を提供することにある。 An object of the present invention is to provide a foamed rubber composition that makes it possible to achieve high hardness to prevent bubble collapse while improving molding processability.
上記目的を達成する本発明の発泡ゴム組成物は、クロロプレンゴム１００重量部に、熱可塑性樹脂を１０〜８０重量部と、有機発泡剤又はマイクロバルーンを１〜１０重量部とを配合したことを特徴とする。 The foamed rubber composition of the present invention that achieves the above object comprises blending 10 to 80 parts by weight of a thermoplastic resin and 1 to 10 parts by weight of an organic foaming agent or microballoon with 100 parts by weight of chloroprene rubber. Features.
本発明の発泡ゴム組成物は、クロロプレンゴム１００重量部に、高硬度化の配合剤として熱可塑性樹脂を１０〜８０重量部配合したことにより、従来のフェノール樹脂等の熱硬化性樹脂を使用した場合よりもムーニースコーチタイムを長くし成形作業性を向上しながら、加硫・発泡成形後の高硬度化を可能にすることができる。したがって、高圧力が負荷される環境下にも発泡ゴム内部の気泡を潰れ難くすることができる。 The foamed rubber composition of the present invention uses a conventional thermosetting resin such as a phenolic resin by blending 10 to 80 parts by weight of a thermoplastic resin as a hardener compounding agent in 100 parts by weight of chloroprene rubber. It is possible to increase the hardness after vulcanization / foam molding while increasing the Mooney scorch time and improving the molding workability. Therefore, it is possible to make it difficult for the bubbles inside the foamed rubber to be crushed even in an environment where a high pressure is applied.
本発明の発泡ゴム組成物において、クロロプレンゴムを高硬度化する配合剤として熱可塑性樹脂を使用する。 In the foamed rubber composition of the present invention, a thermoplastic resin is used as a compounding agent for increasing the hardness of chloroprene rubber.
熱可塑性樹脂の種類は、特に限定されるものではないが、スチレン系重合体、オレフィン系重合体、塩化ビニル系重合体などが好ましく、なかでもスチレン系重合体、エチレン系重合体がより好ましく特にスチレン系重合体がよい。 The type of thermoplastic resin is not particularly limited, but styrene polymers, olefin polymers, vinyl chloride polymers and the like are preferable, and styrene polymers and ethylene polymers are more preferable. Styrene polymers are preferred.
スチレン系重合体としては、スチレン樹脂又はスチレン系共重合体が好ましく挙げられ、スチレン系共重合体がより好ましい。スチレン系共重合体は、スチレン−ブタジエン共重合体、水素添加スチレン系重合体、ＡＢＳ樹脂が好ましく、なかでもスチレン−ブタジエン共重合体がより好ましい。スチレン−ブタジエン共重合体は、スチレン含量が好ましくは５０〜９０重量％、より好ましくは５５〜８５重量％のハイスチレン樹脂が特に好ましく、発泡ゴムの硬度をさらに高くすることができる。 As the styrene polymer, a styrene resin or a styrene copolymer is preferably exemplified, and a styrene copolymer is more preferable. The styrene copolymer is preferably a styrene-butadiene copolymer, a hydrogenated styrene polymer, or an ABS resin, and more preferably a styrene-butadiene copolymer. The styrene-butadiene copolymer is preferably a high styrene resin having a styrene content of preferably 50 to 90% by weight, more preferably 55 to 85% by weight, and can further increase the hardness of the foamed rubber.
また、エチレン系重合体としては、エチレン重合体、エチレン−プロピレン重合体、エチレン−酢酸ビニル共重合体等が発泡ゴムの硬度を高くする観点から好ましい。 As the ethylene polymer, an ethylene polymer, an ethylene-propylene polymer, an ethylene-vinyl acetate copolymer and the like are preferable from the viewpoint of increasing the hardness of the foam rubber.
熱可塑性樹脂の配合量としては、クロロプレンゴム１００重量部に１０〜８０重量部、好ましくは２５〜７５重量部配合する。熱可塑性樹脂の配合量が１０重量部未満であると気泡の潰れを防止するような発泡ゴムの高硬度化を行うことができなくなり、８０重量部を超えるとゴム弾性がなくなり、かつ成形加工性が低下する。 As a compounding quantity of a thermoplastic resin, 10-80 weight part is mixed with 100 weight part of chloroprene rubber, Preferably 25-75 weight part is mix | blended. When the blending amount of the thermoplastic resin is less than 10 parts by weight, it is impossible to increase the hardness of the foamed rubber so as to prevent the collapse of bubbles, and when it exceeds 80 parts by weight, the rubber elasticity is lost and the molding processability Decreases.
本発明の発泡ゴム組成物を加硫成形した後の発泡ゴム成形体は、ＪＩＳ−Ａ硬度が好ましくは７０以上、より好ましくは７５〜１１０にするとよい。ＪＩＳ−Ａ硬度をこのような範囲内にすることにより、高圧力が負荷された場合でも、気泡が潰れずに発泡ゴム成形体を維持することができ好ましい。なお、ＪＩＳ−Ａ硬度は、ＪＩＳ Ｋ６２５３に準拠して測定する値である。 The foamed rubber molding after vulcanization molding of the foamed rubber composition of the present invention has a JIS-A hardness of preferably 70 or more, more preferably 75 to 110. By setting the JIS-A hardness within such a range, even when a high pressure is applied, it is preferable that the foamed rubber molded body can be maintained without collapsing bubbles. The JIS-A hardness is a value measured according to JIS K6253.
熱可塑性樹脂は上記のように発泡ゴム組成物の高硬度化に寄与するだけでなく、ムーニースコーチタイムを延長化する作用を行う。ムーニースコーチタイムとしては好ましくは８分以上、より好ましくは１０分〜２０分と長くすることができる。このため成形作業時間に余裕を与え、成形加工性を向上することができる。なお、ムーニースコーチタイムは、ＪＩＳ Ｋ６３００−１に基づき温度１２５℃において、粘度が最低値から、最低値と最高値の差の５％増加するまでの時間（分）とする。 The thermoplastic resin not only contributes to increasing the hardness of the foamed rubber composition as described above, but also acts to extend the Mooney scorch time. The Mooney scorch time is preferably 8 minutes or longer, more preferably 10 to 20 minutes. For this reason, a margin can be given to the molding operation time and the molding processability can be improved. The Mooney scorch time is the time (minutes) until the viscosity increases by 5% from the minimum value to the maximum value at a temperature of 125 ° C. based on JIS K6300-1.
本発明の発泡ゴム組成物は独立気泡を包含することで特徴づけられ、その気泡の形成は、有機発泡剤又はマイクロバルーンを用いればよい。その配合量としては、ゴム１００重量部に１〜１０重量部、好ましくは１〜５重量部を配合するとよい。発泡剤の配合量をこのような範囲内にすると、より適度な発泡倍率の発泡ゴム組成物が得られ好ましい。 The foamed rubber composition of the present invention is characterized by including closed cells, and the bubbles may be formed using an organic foaming agent or a microballoon. The blending amount is 1 to 10 parts by weight, preferably 1 to 5 parts by weight, based on 100 parts by weight of rubber. When the blending amount of the foaming agent is within such a range, a foamed rubber composition having a more appropriate foaming ratio is obtained, which is preferable.
有機発泡剤は、特に限定されるものではなく、ニトロソ化合物、アゾ化合物、スルホニルヒドラジド系化合物等が好ましく、なかでもアゾ化合物がより好ましい。アゾ化合物はアゾジカルボソアミド、アゾビスイソブチルニトリル、ジアゾアミノベンゼン等が挙げられ、ニトロソ化合物はＮ，Ｎ′−ジニトロソペンタメチレンテトラミン、Ｎ，Ｎ′−ジメチル−Ｎ，Ｎ′−ジニトロソテレフタルアミド等が挙げられ、スルホニルヒドラジド系化合物は、ベンゼンスルホニルヒドラジド、トルエンスルホニルヒドラジド等が挙げられる。また、その他に、ｐ−トルエンスルホニルアジド、４，４′−ジフェニルスルホニルアジド、４，４′−オキシビスベンゾソスルホニルヒドラジド等の有機発泡剤を用いることもできる。これらは単独で若しくは２種以上併せて用いられる。特に好ましくは、加熱上昇、温度によるガス発生量の点から、アゾジカルボソアシドを用いるとよい。 The organic foaming agent is not particularly limited, and is preferably a nitroso compound, an azo compound, a sulfonyl hydrazide compound or the like, and more preferably an azo compound. Examples of the azo compound include azodicarbosoamide, azobisisobutylnitrile, diazoaminobenzene, and the nitroso compound includes N, N′-dinitrosopentamethylenetetramine, N, N′-dimethyl-N, N′-dinitrosotephthale. Examples of the sulfonyl hydrazide compound include benzenesulfonyl hydrazide and toluenesulfonyl hydrazide. In addition, organic foaming agents such as p-toluenesulfonyl azide, 4,4′-diphenylsulfonyl azide, and 4,4′-oxybisbenzososulfonylhydrazide can also be used. These may be used alone or in combination of two or more. Particularly preferably, azodicarbososide is used from the viewpoint of heating increase and gas generation amount due to temperature.
また、マイクロバルーンは、熱可塑性樹脂又は熱硬化性樹脂を殻とする微細な中空体である。なお、マイクロバルーンを使用した場合、ポリマー殻が発泡ゴム中に残ることから、本発明では有機発泡剤を使用する方が好ましい。 The microballoon is a fine hollow body whose shell is a thermoplastic resin or a thermosetting resin. Note that when a microballoon is used, the polymer shell remains in the foamed rubber, and therefore it is preferable to use an organic foaming agent in the present invention.
本発明の発泡ゴム組成物には、上記成分のほかに、必要に応じてさらに他の配合剤を添加することができる。例えば、加硫促進剤、加硫促進助剤、発泡遅延剤、発泡助剤、ゴム補強剤、老化防止剤、紫外線吸収剤等が好ましく挙げられる。 In addition to the above components, other compounding agents can be added to the foamed rubber composition of the present invention as required. For example, a vulcanization accelerator, a vulcanization acceleration aid, a foam retarder, a foaming aid, a rubber reinforcing agent, an antiaging agent, an ultraviolet absorber, and the like are preferable.
特に、ナフテン油を配合することにより、ムーニースコーチタイムを長くすることができる。ナフテン油の配合量としては、クロロプレンゴム１００重量部に対して、２〜２０重量部が好ましく、より好ましくは５〜１５重量部にするとよい。 In particular, the Mooney scorch time can be extended by blending naphthenic oil. The blending amount of naphthenic oil is preferably 2 to 20 parts by weight, more preferably 5 to 15 parts by weight with respect to 100 parts by weight of chloroprene rubber.
本発明において、発泡ゴム組成物は高硬度の板状体やシート状物に加工することができる。加工方法としては、未加硫の発泡ゴム組成物からシートを成形し、これを金型のキャビティに入れ、加熱して加硫・発泡成形する。シート成形は、未加硫の発泡ゴム組成物を温度６０〜１１０℃の練りロール、バンバリーミキサー、ニーダー等により混練して調製し、これを温度５０〜９０℃の押出機、ロール、圧延機等により所定の厚みとなるようにシート成形することが好ましい。 In the present invention, the foamed rubber composition can be processed into a highly rigid plate or sheet. As a processing method, a sheet is formed from an unvulcanized foamed rubber composition, which is put into a cavity of a mold and heated to be vulcanized and foam-molded. Sheet molding is prepared by kneading an unvulcanized foamed rubber composition with a kneading roll, a Banbury mixer, a kneader, etc. at a temperature of 60-110 ° C., and this is an extruder, roll, rolling mill, etc. at a temperature of 50-90 ° C. It is preferable to form a sheet so as to have a predetermined thickness.
本発明の発泡ゴム組成物は、フェノール樹脂を配合した場合よりもムーニースコーチタイムを長くするため、未加硫シートの保存安定性を高くすることができる。 Since the foamed rubber composition of the present invention has a longer Mooney scorch time than when a phenol resin is blended, the storage stability of the unvulcanized sheet can be increased.
未加硫シートの加硫・発泡に使用する場合の金型キャビティの厚みとしては、未加硫シートの厚みに対して発泡倍率（発泡代の厚み）が、１０％〜４０％になるように設定することが好ましい。発泡倍率を１０％〜４０％にすると、吸音材や緩衝材などに使用する場合に吸音と緩衝の性能を両立して発揮することができる。 The mold cavity thickness when used for vulcanization / foaming of unvulcanized sheets is such that the expansion ratio (thickness of foaming allowance) is 10% to 40% with respect to the thickness of the unvulcanized sheet. It is preferable to set. When the expansion ratio is 10% to 40%, both sound absorption and buffering performance can be exhibited when used for a sound absorbing material, a buffering material, and the like.
加硫・発泡成形時の加硫・発泡温度は、従来から知られているものでよく１００〜１８０℃、好ましくは１３０〜１６０℃でよい。 The vulcanization / foaming temperature at the time of vulcanization / foaming may be a conventionally known temperature, and may be 100 to 180 ° C., preferably 130 to 160 ° C.
本発明の発泡ゴム成形体は、従来の発泡ゴム製品の使用されている分野にいずれも使用可能であるが、特に吸音材、緩衝材などの工業用部品として好適である。 The foamed rubber molded article of the present invention can be used in any field where conventional foamed rubber products are used, but is particularly suitable as an industrial part such as a sound absorbing material or a cushioning material.
以下、実施例によって本発明をさらに説明するが、本発明の範囲をこれらの実施例に限定されるものではない。 EXAMPLES Hereinafter, although an Example demonstrates this invention further, the scope of the present invention is not limited to these Examples.
〔実施例１〜８及び比較例１、２〕
下記に列記されたゴム、原材料の中から、それぞれ表１の実施例１〜８、比較例１、２に記載する配合割合において、先ず加硫助剤、亜鉛華及び有機発泡剤を除く原材料を、容量２０リットルのニーダーミキサーにて約１５分間混合した後、このゴム混合物を１８インチ練りロールに巻きつけて加硫助剤、亜鉛華及び有機発泡剤を添加し温度７０℃以下で約１０分間混練し発泡ゴム組成物を得た。
・クロロプレンゴム；昭和電工デュポン社製ネオプレンＷＲＴ
・ハイスチレン樹脂；日本ゼオン社製Ｎｉｐｏｌ ２０５７Ｓ
・水素添加スチレン系重合体；旭化成工業社製タフテックＰ２０００
・粉末ポリエチレン；旭化成工業社製サンファインＬＨ
・フェノール樹脂；住友デュレス社製クレゾール／フェノールホルムアルデヒド樹脂
・青ペトロラタム；山文油化社製ペトロラタムＹＲ
・ナフテン油；日本石油社製コウモレックス２号
[Examples 1 to 8 and Comparative Examples 1 and 2]
From the rubbers and raw materials listed below, the raw materials excluding the vulcanization aid, zinc white and organic foaming agent are first used in the blending ratios described in Examples 1 to 8 and Comparative Examples 1 and 2 of Table 1, respectively. After mixing with a 20 liter kneader mixer for about 15 minutes, this rubber mixture is wound around an 18 inch kneading roll, and a vulcanizing aid, zinc white and organic foaming agent are added, and the temperature is below 70 ° C. for about 10 minutes. A foamed rubber composition was obtained by kneading.
・ Chloroprene rubber; Neoprene WRT manufactured by Showa Denko DuPont
・ High styrene resin; Nipol 2057S manufactured by Nippon Zeon
・ Hydrogenated styrene polymer; Tuftec P2000 manufactured by Asahi Kasei Corporation
・ Polyethylene powder: Sunfine LH manufactured by Asahi Kasei Corporation
・ Phenolic resin: Cresol / phenol formaldehyde resin manufactured by Sumitomo Durres ・ Blue petrolatum; Petrolatum YR manufactured by Yamabun Oil Chemical Co., Ltd.
・ Naphthenic oil; Japan Oil Co., Ltd.
また、以下の配合剤は、実施例１〜８及び比較例１、２について共通に配合した。
・酸化マグネシウム； ４重量部（協和化学工業社製キョウワマグ１５０）
・カーボンブラック；４０重量部（中部カーボン社製カーボンＦＥＦ ＨＴＣ−１００）
・ステアリン酸； １．５重量部（日本油脂社製ビーズステアリン酸）
・老化防止剤； １重量部（大内新興化学社製ノクラック６Ｃ）
・加硫遅延剤； ２重量部（三新化学社製サンセラーＴＳ−Ｇ）
・加硫助剤； １重量部（三新化学社製サンミックス２２−８０Ｅ）
・亜鉛華； ５重量部（正同化学社製亜鉛華３号）
・有機発泡剤； ２重量部（永和化成社製ビニホールＡＣ＃３）
Moreover, the following compounding agents were blended in common for Examples 1 to 8 and Comparative Examples 1 and 2.
Magnesium oxide: 4 parts by weight (Kyowa Mug 150 manufactured by Kyowa Chemical Industry Co., Ltd.)
Carbon black: 40 parts by weight (carbon FEF HTC-100 manufactured by Chubu Carbon Co.)
・ Stearic acid: 1.5 parts by weight (bead stearic acid manufactured by NOF Corporation)
・ Anti-aging agent: 1 part by weight (Nocrack 6C, manufactured by Ouchi Shinsei Chemical)
・ Vulcanization retarder: 2 parts by weight (Sunshin TS-G manufactured by Sanshin Chemical Co., Ltd.)
・ Vulcanization aid: 1 part by weight (Sunshin 22-80E manufactured by Sanshin Chemical Co., Ltd.)
・ Zinc flower: 5 parts by weight (Zinc flower No. 3 manufactured by Shodo Chemical Co., Ltd.)
・ Organic foaming agent; 2 parts by weight (Vinole Hall AC # 3 manufactured by Eiwa Kasei Co., Ltd.)
得られた発泡ゴム組成物について、それぞれ下記の測定方法によりムーニースコーチタイムと、成形後の発泡ゴムのＪＩＳ−Ａ硬度を評価したところ、表１に記載の結果が得られた。 When the Mooney scorch time and the JIS-A hardness of the foamed rubber after molding were evaluated by the following measuring methods for the obtained foamed rubber composition, the results shown in Table 1 were obtained.
本発明の発泡ゴム組成物（実施例１〜８）は、加硫成形後にＪＩＳ−Ａ硬度７０以上を得ながらムーニースコーチタイムが長く成形加工性に優れることが確認された。また、未加硫成形シートの貯蔵安定性にも優れ、実施例２の発泡ゴム組成物は、温度４０℃、湿度
６５ＲＨ％の状態で６週間貯蔵後の加硫・発泡成形も良好に行うことができることが認められた。
It was confirmed that the foamed rubber composition of the present invention (Examples 1 to 8) had a long Mooney scorch time and excellent moldability while obtaining a JIS-A hardness of 70 or more after vulcanization molding. Also, the storage stability of the unvulcanized molded sheet is excellent, and the foamed rubber composition of Example 2 should be well vulcanized and foamed after storage for 6 weeks at a temperature of 40 ° C. and a humidity of 65 RH%. It was recognized that
これに対して、比較例２は、ムーニースコーチタイムが実施例１〜８に比べていずれも短かった。さらに、比較例２の未加硫成形シートを温度４０℃、湿度６５ＲＨ％の状態で１週間貯蔵すると、加硫・発泡が困難となることが確認され、貯蔵安定性に劣ることがわかった。 On the other hand, in Comparative Example 2, the Mooney scorch time was shorter than those in Examples 1-8. Furthermore, when the unvulcanized molded sheet of Comparative Example 2 was stored for 1 week at a temperature of 40 ° C. and a humidity of 65 RH%, it was confirmed that vulcanization and foaming were difficult, and it was found that the storage stability was poor.
〔ムーニースコーチタイム〕
発泡ゴム組成物のムーニースコーチタイムは、ＪＩＳ Ｋ６３００−１に基づいて、温度１２５℃において、粘度が最低値から、最低値と最高値の差の５％増加するまでの時間（分）を測定した。
[Mooney coach time]
The Mooney scorch time of the foamed rubber composition was measured in accordance with JIS K6300-1 at a temperature of 125 ° C., the time (minutes) required for the viscosity to increase by 5% from the minimum value to the maximum value was measured. .
〔ＪＩＳ−Ａ硬度〕
発泡ゴム組成物を押出機にて、温度５４℃で厚み９ｍｍになるように押出成形し未加硫ゴムシートを得た。未加硫ゴムシートを所定の長さに切断して、厚み１２ｍｍ（発泡代３ｍｍ）の額縁状金型枠の中に入れ、温度１５０℃、圧力１．２ＭＰａの条件で１時間、加硫発泡成形を行い、発泡倍率２５％の発泡ゴム成形体を得た。得られた発泡ゴム成形体をＪＩＳ Ｋ ６２５３に準じて、ＪＩＳ−Ａ硬度を測定した。
[JIS-A hardness]
The foamed rubber composition was extruded using an extruder to a thickness of 9 mm at a temperature of 54 ° C. to obtain an unvulcanized rubber sheet. An unvulcanized rubber sheet is cut to a predetermined length and placed in a frame-shaped mold frame having a thickness of 12 mm (foaming allowance 3 mm), and vulcanized and foamed for 1 hour at a temperature of 150 ° C. and a pressure of 1.2 MPa. Molding was performed to obtain a foamed rubber molded body having an expansion ratio of 25%. The obtained foamed rubber molded product was measured for JIS-A hardness according to JIS K 6253.
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Cited By (5)
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| JP5412010B1 (en) * | 2012-09-13 | 2014-02-12 | 電気化学工業株式会社 | Rubber composition, vulcanized product and molded product thereof |
| WO2014041856A1 (en) * | 2012-09-13 | 2014-03-20 | 電気化学工業株式会社 | Rubber composition, and vulcanizate and molded article thereof |
| KR101990287B1 (en) * | 2018-07-27 | 2019-06-19 | 하원태 | Interior and exterior architectural materials and manufacuring method therefor |
| CN111117264A (en) * | 2020-01-08 | 2020-05-08 | 华美节能科技集团有限公司 | Low-heat-conductivity high-pressure-resistance building ground wall sound insulation material and preparation method thereof |
| JP7257656B2 (en) | 2018-03-28 | 2023-04-14 | アトム株式会社 | Rubber composition for foam and anti-vibration gloves |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102219946B (en) * | 2011-05-10 | 2014-02-05 | 易宝（福建）高分子材料股份公司 | Low-halogen environment-friendly chloroprene rubber (CR) closed-cell foam material and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP5412010B1 (en) * | 2012-09-13 | 2014-02-12 | 電気化学工業株式会社 | Rubber composition, vulcanized product and molded product thereof |
| WO2014041856A1 (en) * | 2012-09-13 | 2014-03-20 | 電気化学工業株式会社 | Rubber composition, and vulcanizate and molded article thereof |
| WO2014041649A1 (en) * | 2012-09-13 | 2014-03-20 | 電気化学工業株式会社 | Rubber composition, and vulcanizate and molded article thereof |
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| JP7257656B2 (en) | 2018-03-28 | 2023-04-14 | アトム株式会社 | Rubber composition for foam and anti-vibration gloves |
| KR101990287B1 (en) * | 2018-07-27 | 2019-06-19 | 하원태 | Interior and exterior architectural materials and manufacuring method therefor |
| CN111117264A (en) * | 2020-01-08 | 2020-05-08 | 华美节能科技集团有限公司 | Low-heat-conductivity high-pressure-resistance building ground wall sound insulation material and preparation method thereof |
| CN111117264B (en) * | 2020-01-08 | 2022-07-15 | 华美节能科技集团有限公司 | Low-heat-conductivity high-pressure-resistance sound insulation material for building ground and wall and preparation method thereof |
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