JP5247189B2 - 衝撃吸収パッド及びそれを取り付けた衣類 - Google Patents
衝撃吸収パッド及びそれを取り付けた衣類 Download PDFInfo
- Publication number
- JP5247189B2 JP5247189B2 JP2008060973A JP2008060973A JP5247189B2 JP 5247189 B2 JP5247189 B2 JP 5247189B2 JP 2008060973 A JP2008060973 A JP 2008060973A JP 2008060973 A JP2008060973 A JP 2008060973A JP 5247189 B2 JP5247189 B2 JP 5247189B2
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- JP
- Japan
- Prior art keywords
- absorbing pad
- shock absorbing
- resin composition
- protecting
- greater trochanter
- 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 - Fee Related
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- GQIUQDDJKHLHTB-UHFFFAOYSA-N trichloro(ethenyl)silane Chemical compound Cl[Si](Cl)(Cl)C=C GQIUQDDJKHLHTB-UHFFFAOYSA-N 0.000 description 1
- HKFSBKQQYCMCKO-UHFFFAOYSA-N trichloro(prop-2-enyl)silane Chemical compound Cl[Si](Cl)(Cl)CC=C HKFSBKQQYCMCKO-UHFFFAOYSA-N 0.000 description 1
- ZIBGPFATKBEMQZ-UHFFFAOYSA-N triethylene glycol Chemical compound OCCOCCOCCO ZIBGPFATKBEMQZ-UHFFFAOYSA-N 0.000 description 1
- HYWCXWRMUZYRPH-UHFFFAOYSA-N trimethyl(prop-2-enyl)silane Chemical compound C[Si](C)(C)CC=C HYWCXWRMUZYRPH-UHFFFAOYSA-N 0.000 description 1
- PKRKCDBTXBGLKV-UHFFFAOYSA-N tris(ethenyl)-methylsilane Chemical compound C=C[Si](C)(C=C)C=C PKRKCDBTXBGLKV-UHFFFAOYSA-N 0.000 description 1
- 239000006097 ultraviolet radiation absorber Substances 0.000 description 1
- 239000005050 vinyl trichlorosilane Substances 0.000 description 1
- UKRDPEFKFJNXQM-UHFFFAOYSA-N vinylsilane Chemical class [SiH3]C=C UKRDPEFKFJNXQM-UHFFFAOYSA-N 0.000 description 1
- 125000002256 xylenyl group Chemical class C1(C(C=CC=C1)C)(C)* 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
- PAPBSGBWRJIAAV-UHFFFAOYSA-N ε-Caprolactone Chemical compound O=C1CCCCCO1 PAPBSGBWRJIAAV-UHFFFAOYSA-N 0.000 description 1
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Description
R1Xa (1)
(式中、Xは少なくとも1個のヒドロシリル基を含む基、R1は炭素数2〜150の1〜4価の炭化水素基、aは1〜4から選ばれる整数、ただし、Xに1個のヒドロシリル基しか含まれない場合、aは2以上である)
で示されるものである。具体的には、平均分子量が30000以下である炭化水素系硬化剤が好適に挙げられる。
重合体(B)との相溶性をより良くするためには、前記Rがフェニル基を含有しているものが好ましい。さらに入手のしやすさからRは、―CH2―CH2―C6H5、―CH2―CH(CH3)―C6H5、また、貯蔵安定性の点から―CH2―CH(CH3)―C6H5であることが好ましい。
CH2=CH―R2―Y (2)
(式中、Yは塩素原子、臭素原子、ヨウ素原子などのハロゲン原子、R2は―R3―、―R3―OCO―または―R3―CO―(R3は炭素数1〜20の2価の炭化水素基で、好ましい具体例としてはアルキレン基、シクロアルキレン基、アリーレン基、アラルキレン基が挙げられる)で示される2価の有機基で、化12(R4は炭素数1〜10の炭化水素基)より選ばれた2価の基が特に好ましい)
ポリプロピレングリコール、ポリエチレングリコール、これらの共重合体、ポリテトラメチレングリコール、ソルビトール、スクロース、テトラエチレンジアミン、エチレンジアミン等を開始剤とした1分子内にヒドロキシル基を3個以上含む化合物などのポリエーテルポリオール;
等のアルコール類;
フェノール、クレゾール、キシレノール、レゾルシン、カテコール、ピロガロール、ビスフェノールA、ビスフェノールB、ビスフェノールS、フェノール樹脂などのフェノール性ヒドロキシル基を有する化合物;
等が挙げられる。
発泡剤(D)として気体を用いる場合には、まず、シリコン系重合体を構成する成分、たとえば、分子鎖中に少なくとも2個のヒドロシリル基を有する硬化剤(A)、分子鎖中に少なくとも1個のアルケニル基を有し、主鎖を構成する繰返し単位が飽和炭化水素系単位、または、オキシアルキレン系単位からなる重合体(B)、ヒドロシリル化触媒(C)、必要に応じて気泡調整剤などの任意成分のを撹拌混合して調整し、樹脂原料とする。
前記で得られたシリコン系重合体を基材樹脂とする発泡体を用いて、たとえば、以下のようにして衝撃吸収パッドを得る。まず、得られた発泡体は、そのまま、あるいは発泡成形時に形成される表皮層を切除したり、適当な形状に切り出したりしたものを衝撃吸収パッドとして使用する。ただし、通気性を効果的に発現させることが必要な用途に関しては、表皮層を切除するか、もしくは表皮層に開孔部を設けるか、貫通孔をあけることが好ましい。成形時の発泡体の形態としては、特に限定するものではないが、たとえば板状、シート状、不定形塊状、ビーズ状、あるいは袋状や衣服の形態に成形したものなどが挙げられる。また、発泡体は単独で用いても良く、未発泡体であるプラスチック、発泡倍率の異なる発泡体、フィルム、布、不織布、紙等の素材と一体成形して用いても良い。
転倒衝撃を吸収する評価は、簡易的に以下の方法により行った。人体を用いた実験およびシミュレーションにより解析した結果、転倒による衝撃力は最大で10000N程度にまで達することが報告されている(Robinovitch S. N., Hayes W. C., McMahon T. A.: A prediction of femoral impact forces in falls on the hip. J Biomech Eng, 113:366-374; 1991、など)。また、ダミーモデルを用いた実験では、畳の上での転倒では200Gの加速度を受けることが報告されており(小山憲路,元田英一,豊永敏宏:転倒用ダミーを用いたヒッププロテクターの評価.日職災医誌,49(5):451−455,2001、など)、病院等で一般的に用いられている床材の上での転倒で受ける加速度は、さらに大きくなると思われる。このため、転倒衝撃による加速度を400Gと仮定し、衝撃吸収パッドによりどれだけ減衰させることができるかを評価した。
衝撃吸収率={(400−k)/400}×100 (3)
により算出した。式中、kは衝撃吸収パッドがあるときの衝撃による加速度である。
衝撃吸収パッドの硬さは、ASKER FP型硬度計を、試料の上にそっとのせて、その指示値により評価した。試料によっては、経時的に指示値が下がっていく場合もあるため、硬度計に試料を載せた直後の値を読み取った。
反発弾性は、JISK6400−3に準拠して測定を行い、反発弾性率を算出した。反発弾性の測定には、鋼球(直径16±0.5mm、質量16±0.5g)を、回転させずに試験片に落下させる方法にて行った。鋼球の落下高さは500±0.5mmであり、跳ね返った高さの測定は、鋼球の最上部の位置とした。得られた測定結果から、以下の式(4)を用いて反発弾性率を算出した。
R=(L−16)/500×100 (4)
式中、Rは反発弾性率(%)であり、Lは測定時の跳ね返り高さ(mm)である。
装着感の評価は、パンツの左右脇部、つまり大腿骨頚部を覆う部位の内側に、上部に開口部を持つポケットを形成した綿生地のパンツを作製し、これに衝撃吸収パッドを入れ、20人のパネラーに着用してもらい、日常の動作を邪魔しないか、違和感の有無、24時間の着用による蒸れや肌触りの快・不快感により官能評価を行い、結果を集約した。その際の評価基準は、以下の通りであった。
A:違和感がなく、長時間の着用でも不快感がない
B:違和感はないが、長時間の着用では蒸れが生じ、不快感がある
C:違和感があり、長時間の着用が難しい
実施例・比較例においては、表1に示す化合物を用いた。
まず、100部の重合体B−1に対して、シリカ(商品名:ニップシールSS−50A、東ソー・シリカ(株)製)を25部、さらに酸化防止剤(商品名:IRGANOX245、チバ・スペシャルティ・ケミカルズ(株)製)を1部配合し、撹拌・混合した。また、別に100部の重合体B−1に対して炭酸カルシウム(丸尾カルシウム(株)製MCコートS−20)200部および上記と同様の酸化防止剤を1部配合し、撹拌・混合した。それぞれの混合物をそれぞれ混合物B−1a、混合物B−1bとした。
100部の重合体B−2に対して、発泡剤D−2を7.5部、触媒C−2を0.08部加えて十分に混合し、さらに、硬化剤A−2を13部添加してすばやく混合した。この混合物を厚さ20mm、長軸165mm、短軸115mmの楕円形型枠に注入し、40℃に設定したオーブンで60分加熱硬化し、シリコン系重合体を基材樹脂とする発泡体、即ち衝撃吸収パッドを得た。得られた衝撃吸収パッドの密度は171kg/m3であった。また、得られた衝撃吸収パッドの評価結果は表2に示す。
厚み7mmのポリウレタン発泡体(商品名:Hip Protector、Lyds International社製)を実施例1と同様に評価し、結果を表2に示した。
ポリウレタン発泡体とポリエチレン発泡体、およびステンレスコイルからなる衝撃吸収パッド(商品名:ほねガード、(株)ナイガイ製、厚み7.2mm)を実施例1と同様に評価し、結果を表2に示した。
パンツの左右脇部、つまり大腿骨頚部を覆う部位の内側に、上部に開口部を設け、衝撃吸収パッドを入れることができるポケットを形成した綿生地のパンツを作製した。こうすることにより、パッドの取り外しが容易にできる。このポケットに実施例1で得られた衝撃吸収パッドを入れた。このパンツは着用感が優れ、常時着用しても違和感がなく、衝撃吸収パッドが肌に当たる部分は肌触りが良好であった。
ポケットに入れた衝撃吸収パッドを、実施例2で得られたものにした以外は実施例3と同様にしてパンツを作製し、その使用感を評価した。このパンツは着用感が優れ、常時着用しても違和感がなく、パッドが肌に当たる部分は肌触りが良好であった。
ポケットに入れた衝撃吸収パッドを、比較例1のものにした以外は実施例3と同様にして、パンツを作製し、その使用感を評価した。このパンツにおける衝撃吸収パッドは、反発弾性率が低く、低反発材であるが、衝撃吸収性が低く、硬度が高く硬かった。
ポケットに入れた衝撃吸収パッドを、比較例2のものにした以外は実施例3と同様にして、パンツを作製し、その使用感を評価した。このパンツにおける衝撃吸収パッドは、衝撃吸収性に優れているが、硬く、装着感が悪かった。
Claims (12)
- シリコン系重合体を基材樹脂とする発泡体からなることを特徴とする、大腿骨頚部外側部の大転子部保護用の衝撃吸収パッドであって、
前記基材樹脂が、
分子鎖中に少なくとも2個のヒドロシリル基を有する硬化剤(A)、
分子鎖中に少なくとも1個のアルケニル基を有し、主鎖を構成する繰返し単位が飽和炭化水素系単位、または、オキシアルキレン系単位からなる重合体(B)、
ヒドロシリル化触媒(C)、
を含んでなる樹脂組成物を硬化させたものである、大腿骨頚部外側部の大転子部保護用の衝撃吸収パッド。 - ASKER FP硬度が25.7〜58.8度である、請求項1記載の大腿骨頚部外側部の大転子部保護用の衝撃吸収パッド。
- 前記樹脂組成物に、性状が液体および/または固体である発泡剤(D)を添加し、発泡性樹脂組成物とした後、該発泡性樹脂組成物を硬化させる前、又は、硬化と同時に、発泡させてなることを特徴とする請求項1又は2に記載の大腿骨頚部外側部の大転子部保護用の衝撃吸収パッド。
- 前記性状が液体および/または固体である発泡剤(D)が、活性水素基含有化合物である請求項3記載の大腿骨頚部外側部の大転子部保護用の衝撃吸収パッド。
- 前記樹脂組成物に、性状が気体である発泡剤(D)を分散させ、気体含有樹脂組成物とした後、該気体含有樹脂組成物を型枠に注入して硬化させてなることを特徴とする請求項1又は2に記載の大腿骨頚部外側部の大転子部保護用の衝撃吸収パッド。
- シリコン系重合体を構成する成分と発泡剤を混合した後、型枠に注入してから発泡させることを特徴とする請求項1に記載の大腿骨頚部外側部の大転子部保護用の衝撃吸収パッドの製造方法であって、
前記シリコン系重合体を構成する成分が、分子鎖中に少なくとも2個のヒドロシリル基を有する硬化剤(A)、分子鎖中に少なくとも1個のアルケニル基を有し、主鎖を構成する繰返し単位が飽和炭化水素系単位、または、オキシアルキレン系単位からなる重合体(B)、ヒドロシリル化触媒(C)を含んでなる樹脂組成物である、大腿骨頚部外側部の大転子部保護用の衝撃吸収パッドの製造方法。 - 前記樹脂組成物を硬化させる前、又は、硬化させると同時に発泡させることを特徴とする請求項6に記載の大腿骨頚部外側部の大転子部保護用の衝撃吸収パッドの製造方法。
- 性状が気体である発泡剤(D)を用い、前記樹脂組成物に発泡剤(D)を分散させて気体含有樹脂組成物とした後、型枠に注入してから硬化させることを特徴とする請求項6に記載の大腿骨頚部外側部の大転子部保護用の衝撃吸収パッドの製造方法。
- 請求項1〜5何れか一項に記載の大腿骨頚部外側部の大転子部保護用の衝撃吸収パッドを、大腿骨頚部外側部の大転子部を保護できる位置に取り付けてなる衣類。
- 衝撃吸収パッドを着脱自在に取り付けてなる請求項9記載の衣類。
- パンツ類である請求項9又は10記載の衣類。
- 大腿骨頚部外側部の大転子部を保護できる位置に、請求項1〜5何れか一項に記載の大腿骨頚部外側部の大転子部保護用の衝撃吸収パッドを取り付けてなる衣類を着用する大腿骨骨折を防止する方法。
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