JPH085983B2 - Shock absorbing foam - Google Patents
Shock absorbing foamInfo
- Publication number
- JPH085983B2 JPH085983B2 JP62221069A JP22106987A JPH085983B2 JP H085983 B2 JPH085983 B2 JP H085983B2 JP 62221069 A JP62221069 A JP 62221069A JP 22106987 A JP22106987 A JP 22106987A JP H085983 B2 JPH085983 B2 JP H085983B2
- Authority
- JP
- Japan
- Prior art keywords
- foam
- shock absorbing
- eva
- shock
- impact absorption
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000006260 foam Substances 0.000 title claims description 28
- 230000035939 shock Effects 0.000 title description 19
- 238000010521 absorption reaction Methods 0.000 claims description 29
- 239000005038 ethylene vinyl acetate Substances 0.000 claims description 21
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 claims description 21
- 238000005187 foaming Methods 0.000 claims description 10
- 229920000642 polymer Polymers 0.000 claims description 10
- 229920003048 styrene butadiene rubber Polymers 0.000 claims description 9
- 230000005484 gravity Effects 0.000 claims description 7
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 claims description 6
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 claims description 6
- 229920001971 elastomer Polymers 0.000 claims description 6
- 239000005060 rubber Substances 0.000 claims description 6
- 229920002589 poly(vinylethylene) polymer Polymers 0.000 claims description 3
- 229920002857 polybutadiene Polymers 0.000 description 8
- 239000002174 Styrene-butadiene Substances 0.000 description 6
- 239000011359 shock absorbing material Substances 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000013329 compounding Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 239000004088 foaming agent Substances 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 150000002978 peroxides Chemical class 0.000 description 2
- 230000001012 protector Effects 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000006261 foam material Substances 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 239000011256 inorganic filler Substances 0.000 description 1
- 229910003475 inorganic filler Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F1/00—Springs
- F16F1/36—Springs made of rubber or other material having high internal friction, e.g. thermoplastic elastomers
- F16F1/37—Springs made of rubber or other material having high internal friction, e.g. thermoplastic elastomers of foam-like material, i.e. microcellular material, e.g. sponge rubber
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Vibration Prevention Devices (AREA)
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明は衝撃吸収用発泡体に係り、特に、軽量かつ安
価で極めて衝撃吸収性能に優れた衝撃吸収用発泡体に関
する。Description: TECHNICAL FIELD The present invention relates to a shock absorbing foam, and more particularly to a shock absorbing foam that is lightweight, inexpensive and excellent in shock absorbing performance.
［従来の技術］ シューズソール、各種スポーツ用プロテクター、ヘル
メット等の護身用品、工業用衝撃吸収部品等には、与え
られた衝撃を緩和するための衝撃吸収フォームが内蔵さ
れている。[Prior Art] Shoe soles, protectors for various sports, self-defense products such as helmets, industrial shock-absorbing parts, and the like have a built-in shock-absorbing foam for absorbing a given shock.
従来、軽量で安価な衝撃吸収フォーム材としては、一
般に、エチレン−酢酸ビニルコーポリマー（EVA）が大
量に使用されている。Conventionally, ethylene-vinyl acetate copolymer (EVA) is generally used in a large amount as a lightweight and inexpensive shock absorbing foam material.
［発明が解決しようとする問題点］ しかしながら、従来使用されているEVAフォームは軽
量で安価である反面、次のような欠点がある。[Problems to be Solved by the Invention] However, although the EVA foam used conventionally is lightweight and inexpensive, it has the following drawbacks.
低硬度品は衝撃吸収性能が低い。 Low hardness products have low impact absorption performance.
高硬度品でも強い衝撃に対して性能に問題がある。 Even high hardness products have a problem in performance against strong impact.
衝撃吸収性能の耐久性に問題がある。 There is a problem in the durability of shock absorption performance.
［問題点を解決するための手段］ 本発明は上記従来の問題点を解決し、軽量かつ安価
で、広範な衝撃力に対して優れた衝撃吸収性能を有し、
しかも長時間の使用に対する耐久性が著しく改善された
衝撃吸収用発泡体を提供するべくなされたものであっ
て、 酢酸ビニル26重量％以下のエチレン−酢酸ビニルコー
ポリマー35〜50重量％と、シンジオタクチック1,2−ポ
リブタジエン20〜35重量％と、高スチレン含量のスチレ
ン−ブタジエン共重合ゴム25〜35重量％とを含むポリマ
ー成分を発泡させてなり、比重が0.05〜0.6であること
を特徴とする衝撃吸収用発泡体、 を要旨とするものである。[Means for Solving Problems] The present invention solves the above-mentioned conventional problems, is lightweight and inexpensive, and has excellent shock absorption performance against a wide range of impact forces,
Moreover, it is intended to provide a foam for impact absorption, which has a significantly improved durability against long-term use, and comprises 35 to 50% by weight of ethylene-vinyl acetate copolymer having a vinyl acetate content of 26% by weight or less and a syndyne. Characterized by foaming a polymer component containing 20-35% by weight of tactic 1,2-polybutadiene and 25-35% by weight of styrene-butadiene copolymer rubber having a high styrene content, and having a specific gravity of 0.05-0.6. And a shock absorbing foam.
以下に本発明を詳細に説明する。 Hereinafter, the present invention will be described in detail.
なお、本明細書において「％」は特記しない限り「重
量％」を表わすものとする。In this specification, “%” means “% by weight” unless otherwise specified.
本発明の衝撃吸収用発泡体のポリマー成分のうち、エ
チレン−酢酸ビニルコーポリマー（以下「EVA」と略記
することがある。）は、酢酸ビニル含有量が26％以下の
ものである。EVAの酢酸ビニル含有量が26％以下である
と比較的エネルギー吸収性能が高く、得られる発泡体の
衝撃吸収性が高くなる。EVAの好ましい酢酸ビニル含有
量は10〜20％である。Among the polymer components of the impact absorbing foam of the present invention, ethylene-vinyl acetate copolymer (hereinafter sometimes abbreviated as “EVA”) has a vinyl acetate content of 26% or less. When the vinyl acetate content of EVA is 26% or less, the energy absorption performance is relatively high, and the resulting foam has high impact absorption. The preferred vinyl acetate content of EVA is 10-20%.
また、シンジオタクチック1,2−ポリブタジエン（以
下「1,2−PBD」と略記することがある。）の配合は、耐
永久ひずみ性が向上するため衝撃吸収性能の耐久性を向
上させることができる。In addition, the compounding of syndiotactic 1,2-polybutadiene (hereinafter sometimes abbreviated as “1,2-PBD”) improves the permanent set resistance, and thus improves the durability of the shock absorption performance. it can.
更に、高スチレン含量のスチレン−ブタジエン共重合
ゴム（以下「ハイスチレン−SBR」と略記することがあ
る。）は、25℃での反発弾性が20％以下であり、エネル
ギー吸収性能がEVAよりも更に大きく、得られる発泡体
の衝撃吸収性能の向上に有効である。Furthermore, a styrene-butadiene copolymer rubber with a high styrene content (hereinafter sometimes abbreviated as "high styrene-SBR") has a rebound resilience of 20% or less at 25 ° C, and has an energy absorption performance higher than that of EVA. It is even larger and effective in improving the impact absorption performance of the resulting foam.
本発明の発泡体は、これらポリマー成分をEVA35〜50
％、1,2−PBD20〜35％、ハイスチレン−SBR25〜35％の
割合で配合して発泡させたものである。The foam of the present invention has these polymer components EVA 35-50.
%, 1,2-PBD 20-35%, and high styrene-SBR 25-35%.
ポリマー成分のうち、EVAは高発泡性に作用する。EVA
が35％未満では発泡性が悪くなり、高発泡性が得られな
い。また、EVAが50％を超えると得られる発泡体の衝撃
吸収性能が低下する。EVA has a high foaming property among the polymer components. EVA
If it is less than 35%, the foamability will be poor and high foamability cannot be obtained. Further, when the EVA exceeds 50%, the shock absorbing performance of the obtained foam is deteriorated.
1,2−PBDが20％未満では得られる発泡体の衝撃吸収性
の耐久性が十分に得られず、また35％を超えると、衝撃
吸収性及び発泡性が悪くなる。If the 1,2-PBD content is less than 20%, the durability of the resulting foam will not be sufficient, and if it exceeds 35%, the impact absorption and foaming properties will be poor.
ハイスチレン−SBRが25％未満では得られる発泡体の
衝撃吸収性の改良効果が小さく、また35％を超えると発
泡性が悪くなる。When the content of high styrene-SBR is less than 25%, the effect of improving the impact absorption of the resulting foam is small, and when it exceeds 35%, the foamability is deteriorated.
本発明の衝撃吸収用発泡体は、上記配合のポリマー成
分に必要に応じて、ホワイトカーボン、炭酸カルシウ
ム、カーボンブラック、シリカ、その他の無機充填剤等
の充填剤、可塑剤、オイル、発泡剤、発泡助剤、パーオ
キサイド等を加え、常法に従って加熱発泡硬化して得ら
れ、その比重は0.05〜0.6である。The impact-absorbing foam of the present invention is a filler such as white carbon, calcium carbonate, carbon black, silica, and other inorganic fillers, a plasticizer, an oil, a foaming agent, if necessary for the polymer component of the above-mentioned compounding It is obtained by adding a foaming auxiliary agent, peroxide and the like and heating and foaming according to a conventional method to obtain a specific gravity of 0.05 to 0.6.
本発明の衝撃吸収用発泡体の比重が0.6を超えると軽
量性が損なわれ、また0.05未満では十分な衝撃吸収性及
び強度が得られない。When the specific gravity of the shock absorbing foam of the present invention exceeds 0.6, the lightness is impaired, and when it is less than 0.05, sufficient shock absorbing property and strength cannot be obtained.
なお、本発明の衝撃吸収用発泡体を製造する際の好ま
しい配合割合は次の通りである。The preferred blending ratio for producing the impact absorbing foam of the present invention is as follows.
ポリマー成分 100 重量部 充填剤 25 〃 発泡剤 3.5 〃 パーオキサイド 1.5 〃 また、発泡処理条件は155〜165℃で13〜17分間程度と
するのが好ましい。Polymer component 100 parts by weight Filler 25 〃 Foaming agent 3.5 〃 Peroxide 1.5 〃 Further, the foaming treatment condition is preferably at 155 to 165 ° C for about 13 to 17 minutes.
本発明の衝撃吸収用発泡体は、低コストで得られ、し
かも、軽量で極めて優れた衝撃吸収性を有し、衝撃吸収
性の耐久性にも優れ、長期間使用による永久変形も改良
されているため、ジョギング、テニス、バスケットボー
ル等のスポーツシューズ及び各種作業靴等のシューズソ
ール用衝撃吸収素材、ヘルメット、サポーター、胴あ
て、すね当て、肩パット等の各種スポーツ用プロテクタ
ー用衝撃吸収素材、武道具（面、胴、篭手、すね当て
等）用衝撃吸収素材、工事用、安全用、単車用ヘルメッ
ト用衝撃吸収素材、その他工業用衝撃吸収部品等極めて
幅広い用途に有効に適用することができる。INDUSTRIAL APPLICABILITY The foam for impact absorption of the present invention can be obtained at low cost, is lightweight, has extremely excellent impact absorption, has excellent durability of impact absorption, and has improved permanent deformation due to long-term use. Therefore, shock absorbing materials for sports soles such as jogging, tennis, basketball, etc. and shoe soles for various work shoes, shock absorbing materials for protectors for sports such as helmets, supporters, torso pads, shin pads, shoulder pads, etc. It can be effectively applied to an extremely wide range of applications such as shock absorbing materials for surfaces, torso, baskets, shin pads, etc., construction, safety, shock absorbing materials for motorcycle helmets, and other industrial shock absorbing parts.
［作用］ 酢酸ビニル含有量26％以下のEVAは、EVAの中でも比較
的エネルギー吸収性能が大きく衝撃吸収性が大きい。ま
たEVAは、高発泡性が良い。[Function] EVA having a vinyl acetate content of 26% or less has a relatively large energy absorption performance and a large impact absorption performance among EVA. EVA has a high foaming property.
1,2−PBDは、発泡体の衝撃吸収性能の耐久性を向上さ
せることができる。1,2-PBD can improve the durability of the shock absorbing performance of the foam.
ハイスチレン−SBRはエネルギー吸収性能がEVA、1,2
−PBDよりも大きく、発泡体の衝撃吸収性能の向上に有
効である。High styrene-SBR has EVA, 1,2 energy absorption performance
-It is larger than PBD and is effective in improving the impact absorption performance of the foam.
しかして、このような高特性EVA、1,2−PBD及びハイ
スチレン−SBRをそれぞれ35〜50％、20〜35％、25〜35
％配合して発泡させて得られる、比重0.05〜0.6の本発
明の衝撃吸収用発泡体は、高発泡性、高衝撃吸収性で、
衝撃吸収性の耐久性にも優れ、しかも軽量である。ま
た、本発明で用いるEVA、1,2−PBDは低コストであるの
で、その製造コストも極めて廉価である。Therefore, such high-performance EVA, 1,2-PBD and high styrene-SBR are added to 35-50%, 20-35%, 25-35%, respectively.
%, The foam for impact absorption of the present invention having a specific gravity of 0.05 to 0.6, which is obtained by blending and foaming, has high foamability and high impact absorption,
It has excellent shock absorption durability and is lightweight. Moreover, since the EVA and 1,2-PBD used in the present invention are low in cost, the manufacturing cost thereof is also extremely low.
［実施例］ 以下に実施例及び比較例を挙げて本発明を更に具体的
に説明するが、本発明はその要旨を超えない限り、以下
の実施例に限定されるものではない。[Examples] The present invention will be described in more detail below with reference to Examples and Comparative Examples, but the present invention is not limited to the following Examples unless it exceeds the gist.
実施例１〜３、比較例１、２ 第１表に示す配合でポリマー成分及びその他の添加剤
を混合し、160℃で10分間加熱発泡硬化させて、第１表
に示す比重の発泡体を得た。Examples 1 to 3 and Comparative Examples 1 and 2 Polymer components and other additives were mixed in the formulations shown in Table 1 and the mixture was heated and foamed and cured at 160 ° C. for 10 minutes to give foams having the specific gravity shown in Table 1. Obtained.
得られた発泡体について衝撃吸収性を調べ、その結果
を第１表に記した。The shock absorption of the obtained foam was examined, and the results are shown in Table 1.
第１表より、本発明の衝撃吸収用発泡体は、衝撃吸収
性が著しく高く、しかも衝撃吸収性の耐久性にも優れて
いることが明らかである。 From Table 1, it is clear that the foam for impact absorption of the present invention has remarkably high impact absorption and also excellent durability of impact absorption.
［発明の効果］ 以上詳述した通り、本発明の衝撃吸収用発泡体は、特
定のEVA、及び1,2−PBDとハイスチレン−SBRを特定割合
で配合して発泡させてなる特定比重を発泡体であって、
低コストかつ軽量で、極めて優れた衝撃吸収性能を有
し、衝撃吸収性能の耐久性も著しく高い。[Effects of the Invention] As described in detail above, the impact-absorbing foam of the present invention has a specific specific gravity obtained by blending a specific EVA and 1,2-PBD and high styrene-SBR in a specific ratio and foaming. A foam,
It is low-cost and lightweight, has excellent shock absorption performance, and has extremely high shock absorption performance durability.
本発明の衝撃吸収用発泡体は、安価で高性能かつ長寿
命であり、幅広い用途に適用可能である。The foam for impact absorption of the present invention is inexpensive, has high performance, has a long life, and is applicable to a wide range of applications.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭62−32129（ＪＰ，Ａ) 日本ゴム協会編「新ゴム技術入門」日本 ゴム協会（昭和44年11月１日）第25頁第15 〜第22行及び第43頁表12 高分子学会編「高分子辞典」朝倉書店 （昭和60年４月１日）第686頁 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-62-32129 (JP, A) “Introduction to New Rubber Technology” edited by Japan Rubber Association Japan Rubber Association (November 1, 1969) Page 25, 15 ~ Line 22 and page 43 Table 12 "Polymer Dictionary" edited by The Society of Polymer Science, Asakura Shoten (April 1, 1985) Page 686
Claims (1)
−酢酸ビニルコーポリマー35〜50重量％と、シンジオタ
クチック1,2−ポリブタジエン20〜35重量％と、高スチ
レン含量のスチレン−ブタジエン共重合ゴム25〜35重量
％とを含むポリマー成分を発泡させてなり、比重が0.05
〜0.6であることを特徴とする衝撃吸収用発泡体。1. An ethylene-vinyl acetate copolymer having a vinyl acetate content of 26% by weight or less, 35 to 50% by weight, syndiotactic 1,2-polybutadiene of 20 to 35% by weight, and a styrene-butadiene copolymer having a high styrene content. It is made by foaming a polymer component containing 25-35 wt% of polymerized rubber and has a specific gravity of 0.05.
A foam for impact absorption, characterized in that it is ~ 0.6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62221069A JPH085983B2 (en) | 1987-02-17 | 1987-09-03 | Shock absorbing foam |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3394887 | 1987-02-17 | ||
| JP62-33948 | 1987-02-17 | ||
| JP62221069A JPH085983B2 (en) | 1987-02-17 | 1987-09-03 | Shock absorbing foam |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS649245A JPS649245A (en) | 1989-01-12 |
| JPH085983B2 true JPH085983B2 (en) | 1996-01-24 |
Family
ID=26372722
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62221069A Expired - Lifetime JPH085983B2 (en) | 1987-02-17 | 1987-09-03 | Shock absorbing foam |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH085983B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3178340B1 (en) * | 2014-08-07 | 2019-07-31 | ASICS Corporation | Sole for shoes, and shoes |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100390049B1 (en) * | 2001-03-09 | 2003-07-04 | 명광화학공업 주식회사 | rubber constitute used for shoes outsole |
| JP6734621B2 (en) | 2014-02-20 | 2020-08-05 | オルガノ株式会社 | Ozone water supply method and ozone water supply device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6232129A (en) * | 1985-08-05 | 1987-02-12 | Japan Synthetic Rubber Co Ltd | Composition for crosslinked ethylene/vinyl acetate copolymer foam |
-
1987
- 1987-09-03 JP JP62221069A patent/JPH085983B2/en not_active Expired - Lifetime
Non-Patent Citations (2)
| Title |
|---|
| 日本ゴム協会編「新ゴム技術入門」日本ゴム協会（昭和４４年１１月１日）第２５頁第１５〜第２２行及び第４３頁表１２ |
| 高分子学会編「高分子辞典」朝倉書店（昭和６０年４月１日）第６８６頁 |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3178340B1 (en) * | 2014-08-07 | 2019-07-31 | ASICS Corporation | Sole for shoes, and shoes |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS649245A (en) | 1989-01-12 |
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