JP7253291B1 - 低圧縮永久ひずみを有する減衰パッド - Google Patents
低圧縮永久ひずみを有する減衰パッド Download PDFInfo
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- JP7253291B1 JP7253291B1 JP2022068814A JP2022068814A JP7253291B1 JP 7253291 B1 JP7253291 B1 JP 7253291B1 JP 2022068814 A JP2022068814 A JP 2022068814A JP 2022068814 A JP2022068814 A JP 2022068814A JP 7253291 B1 JP7253291 B1 JP 7253291B1
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- Prior art keywords
- compression set
- damping pad
- low compression
- damping
- pores
- 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.)
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Abstract
Description
(1)圧縮永久ひずみが劣る(40%超)。減衰パッドが長期使用後に変形して、パッドがへこみ、反発弾性が低下する。
(2)黄変及び加水分解、減衰パッドの耐候性が劣り、太陽光下で容易に老化又は分解する。これは抗酸化剤及び光安定剤が製造プロセス中に添加されているとしても、経時的に避けることができない。
低圧縮永久ひずみを有する減衰パッドは表面層及び発泡内層を含み、発泡内層は表面層で覆われ、表面層の厚さは低圧縮永久ひずみを有する減衰パッドの全厚さの0.05%~1.50%であり、発泡内層は複数の気孔を含み、発泡内層に含まれる気孔は複数の閉気孔及び複数の開気孔を含み、開気孔の割合は30%以上であり、低圧縮永久ひずみを有する減衰パッドは、30C~60CのショアC硬度、0.10g/cm3~0.35g/cm3の平均密度、40%以下の圧縮永久ひずみ、20以下の減速度g値、50%以上の反発弾性を有する。
ポリマー材料は再生利用したTEEE又は市販のTEEEでよく、ソフト及びハードセグメントの割合を意図的に調節する必要はない。また、超臨界流体を用いた射出成形技術は減衰パッドを発泡するのに使用され、ペンタンなどの高揮発性化学発泡剤は必要ない。従って、毒性物質は生じず、耐火性又は汚染の懸念は引き起こされず、製品をさらに広く応用できる。所望のポリマー材料をそのメルトフローインデックス、ショアD硬度、引張弾性率、密度及び破断伸びに応じて選択してよく、又は混合することにより調製してよく、これにより本開示の低圧縮永久ひずみを有する減衰パッドが得られると理解される。
本開示において、低圧縮永久ひずみを有する減衰パッドの発泡内層に含まれる気孔は空気で満たされる。「閉気孔」という用語は単一の核形成点から形成される気孔を指し、「開気孔」という用語は、2つ以上の閉気孔により形成され、閉気孔間に形成される1つ又は複数の貫通孔を有する気孔を指す。閉気孔の割合が高い場合、低圧縮永久ひずみを有する減衰パッドは高反発弾性を有するが、減速度g値も上昇し、これは減衰効果に不利である。
本開示の減衰パッドは図1に示す縦型射出成形機10を用いて調製されるが、一般的な横型射出成形機も調製に使用できる。射出成形機10は第1スクリューバレル11、ガス導入部12、第2スクリューバレル13、インジェクタ14及び金型15を含む。
A1.メルトフローインデックス(MI):標準法ISO1133に準拠して試験する。
A2.ショアD硬度:標準法ISO868に準拠して試験する。
A3.引張弾性率:標準法ISO527に準拠して試験する。
A4.密度:標準法ISO1183に準拠して試験する。
A5.破断伸び:標準法ISO527に準拠して試験する。
その後、混合物を第2スクリューバレル13に導入した。第2スクリューバレル13の圧力及び温度をそれぞれ窒素の超臨界条件である127バール及び190℃~230℃に設定して、第2スクリューバレル13中の混合物を超臨界状態にすることができ、その後混合物を混和して超臨界流体ブレンドを得た。
実施例1~4において、ベント孔を金型15の上部及び下部壁(図1に図示しない)に配置した。実施例1~4の射出成形において、金型15のベント孔を開くのと同時に、超臨界流体ブレンドを金型15に注入するため、金型におけるベント時間の遅延は0.0秒であった。最後に、冷却するために金型15に減衰パッドを放置して、低圧縮永久ひずみを有する減衰パッドが得られた。
発泡内層22は発泡内層22に含まれる複数の気孔220、221を含み、発泡内層22に含まれる気孔220、221の長径は100μm~400μmである。発泡内層22に含まれる気孔220、221は、複数の閉気孔220及び複数の開気孔221を含み、開気孔221のいずれかは開気孔221及び別の開気孔221を連結する少なくとも1つの貫通孔222を含む。開気孔221の割合は30%以上である。気孔の形状は選択されるポリマー材料と、インジェクタ14及び金型15間の圧力差との影響を受ける。
B1.開気孔の割合:標準法ASTMD6226に準拠して試験する。
B2.ショアC硬度:標準法ISO868に準拠して試験する。
B3.平均密度:標準法ISO1183に準拠して試験する。
B4.圧縮永久ひずみ:標準法CNS3560に準拠して試験する。
B5.減速度g値:標準法SATRATM142に準拠して試験する。
B6.反発弾性:標準法ASTMD2632に準拠して試験する。
Claims (5)
- 低圧縮永久ひずみを有する減衰パッドであって、以下の、
(1)熱可塑性エーテルエステルエラストマー及び熱可塑性ポリウレタンを含み、4g/10分~18g/10分のメルトフローインデックス(230℃)、20D~48DのショアD硬度、20MPa~70MPaの引張弾性率、1.0g/cm3~1.3g/cm3の密度、300%以上の破断伸びを有するポリマー材料を提供する工程、
(2)前記ポリマー材料を溶融して溶融ポリマー材料を得る工程、
(3)窒素又は二酸化炭素を前記溶融ポリマー材料に添加して混合物を得る工程、
(4)前記混合物を超臨界状態にし、前記混合物を混和して、超臨界流体ブレンドを得る工程、及び、
(5)前記超臨界流体ブレンドを注入、成形して前記低圧縮永久ひずみを有する減衰パッドを得る工程、を含む方法により調製され、
前記低圧縮永久ひずみを有する減衰パッドは表面層及び発泡内層を含み、
前記発泡内層は前記表面層で覆われ、
前記表面層の厚さは前記低圧縮永久ひずみを有する減衰パッドの全厚さの0.05%~1.50%であり、
前記発泡内層は複数の気孔を含み、
前記発泡内層に含まれる前記気孔は複数の閉気孔及び複数の開気孔を含み、
前記開気孔は30%以上の割合であり、
前記低圧縮永久ひずみを有する減衰パッドはショアC硬度30C~60C、平均密度0.10g/cm3~0.35g/cm3、圧縮永久ひずみ40%以下、減速度g値20以下、反発弾性50%以上であることを特徴とする、
低圧縮永久ひずみを有する減衰パッド。 - 前記ポリマー材料は70wt%以上~100wt%未満の前記熱可塑性エーテルエステルエラストマー、及び0wt%超~30wt%以下の前記熱可塑性ポリウレタンを含むことを特徴とする、請求項1に記載の低圧縮永久ひずみを有する減衰パッド。
- 前記ポリマー材料は、5g/10分~18g/10分の前記メルトフローインデックス(230℃)を有することを特徴とする、請求項1に記載の低圧縮永久ひずみを有する減衰パッド。
- 前記ポリマー材料は、30D~45DのショアD硬度を有することを特徴とする、請求項1に記載の低圧縮永久ひずみを有する減衰パッド。
- 反発弾性が60%以上である、請求項1~4のいずれか一項に記載の低圧縮永久ひずみを有する減衰パッド。
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