JP6053482B2 - 注射器用ガスケットの製造方法 - Google Patents
注射器用ガスケットの製造方法 Download PDFInfo
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- JP6053482B2 JP6053482B2 JP2012262842A JP2012262842A JP6053482B2 JP 6053482 B2 JP6053482 B2 JP 6053482B2 JP 2012262842 A JP2012262842 A JP 2012262842A JP 2012262842 A JP2012262842 A JP 2012262842A JP 6053482 B2 JP6053482 B2 JP 6053482B2
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- Prior art keywords
- gasket
- polymerization
- meth
- syringe
- acrylamide
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Images
Classifications
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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
- C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
- C08J7/12—Chemical modification
- C08J7/16—Chemical modification with polymerisable compounds
- C08J7/18—Chemical modification with polymerisable compounds using wave energy or particle radiation
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Description
前記ポリマー鎖の長さは、10〜50000nmであることが好ましい。
上記加硫ゴム、上記熱可塑性エラストマーとしては、二重結合に隣接する炭素原子(アリル位の炭素原子)を有するものが好適に使用される。
図2〜3において、中央縦溝3a(溝深さD1)、ショルダー縦溝3b(溝深さD2)は、タイヤ周方向に直線状にのびるストレート溝で構成される。このようなストレート溝は、排水抵抗を小さくし、直進走行時に高い排水性能を発揮しうる。
イソプレンユニットを含むクロロブチルゴム(不飽和度:1〜2%)をトリアジンで架橋した加硫ゴムガスケット(180℃で10分加硫)をベンゾフェノンの1wt%アセトン溶液に浸漬して、加硫ゴム表面にベンゾフェノンを吸着させた。その後、加硫ゴムを取り出し乾燥した。
乾燥した加硫ゴムをアクリルアミドの水溶液(2.5M)の入ったガラス反応容器に浸漬し、365nmの波長を持つLEDUVランプ(2mW/cm2)で、紫外線を60時間照射してラジカル重合を行ってゴム表面にポリマー鎖を成長させ、表面改質弾性体ガスケット(ポリマーブラシ)を得た。
アクリルアミドの水溶液(2.5M)をアクリルアミドの1.25Mの水溶液に、紫外線の照射時間を120時間に変更した以外は、実施例1と同様にして表面改質弾性体ガスケットを作製した。
ベンゾフェノンの1wt%アセトン溶液を2,4−ジメチルチオキサントンの1%アセトン溶液に、紫外線の照射時間を30分間に変更した以外は、実施例1と同様にして表面改質弾性体ガスケットを作製した。
クロロブチルゴムをトリアジンで架橋した加硫ゴムガスケット(180℃で10分加硫)を使用した。
イソプレンユニットを含むクロロブチルゴム(不飽和度:1〜2%)をトリアジンで架橋した加硫ゴムシート(2mm厚:180℃で10分加硫)をベンゾフェノンの1wt%アセトン溶液に浸漬して、加硫ゴム表面にベンゾフェノンを吸着させた。その後、加硫ゴムを取り出し乾燥した。
乾燥した加硫ゴムをアクリルアミドの水溶液(2.5M)の入ったガラス反応容器に浸漬し、365nmの波長を持つLEDUVランプ(2mW/cm2)で、紫外線を60時間照射してラジカル重合を行ってゴム表面にポリマー鎖を成長させ、表面改質弾性体シート(ポリマーブラシ)を得た。
(ポリマー鎖の長さ)
加硫ゴム表面に形成されたポリマー鎖の長さは、ポリマー鎖が形成された改質ゴム断面を、SEMを使用し、加速電圧15kV、1000倍で測定した。撮影されたポリマー層の厚みをポリマー鎖の長さとした。
表面改質弾性体の表面の摩擦抵抗力を測定するために、実施例、比較例で作製した加硫ゴムガスケットを注射器のCOP樹脂シリンジにセットし、引張試験機を用いて押し込んでいき、そのときの摩擦抵抗力を測定した(押し込み速度:100mm/min)。比較例1の摩擦抵抗力を100として、下記式を用い、各実施例、比較例について摩擦抵抗指数で示した。指数が小さい方が、摩擦抵抗力が低いことを示す。
(摩擦抵抗指数)=各実施例の摩擦抵抗力/比較例1の摩擦抵抗力×100
表面改質弾性体シートを1mg/mlのウシ血清アルブミン溶液に37℃で3時間接触させた。このとき、吸着されたウシ血清アルブミン・タンパク質量をJIS T9010に従い抽出を行い、抽出液中のタンパク量をLowry法で定量した。その値を表面改質弾性体シートの面積当たりの値に換算した。
11a、11b、11c 環状突起部
13 底面部の表面
2 トレッド部
3a 中央縦溝
3b ショルダー縦溝
5 細溝
6 中間傾斜溝
7 継ぎ溝
8、8a、8b ショルダー横溝
Claims (10)
- ブチルゴム又はハロゲン化ブチルゴムからなる改質対象物の表面に、ベンゾフェノン系化合物及び/又はチオキサントン系化合物を吸着させて、前記改質対象物の表面に重合開始点を形成する工程1と、前記重合開始点を起点にして分子内にC−N結合を持つモノマーをラジカル重合させ、前記改質対象物の表面にポリマー鎖を成長させる工程2とを含む注射器用ガスケットの製造方法。
- 更に、吸着させた前記ベンゾフェノン系化合物及び/又はチオキサントン系化合物に光を照射して前記改質対象物の表面に化学結合させる請求項1記載の注射器用ガスケットの製造方法。
- 前記ラジカル重合が光ラジカル重合である請求項1又は2記載の注射器用ガスケットの製造方法。
- 前記光ラジカル重合は、波長300〜450nmの光を照射するラジカル重合である請求項3記載の注射器用ガスケットの製造方法。
- 前記ラジカル重合は、光照射時又は照射前に反応容器及び反応液に不活性ガスを導入し、不活性ガス雰囲気に置換して重合させる請求項1〜4のいずれかに記載の注射器用ガスケットの製造方法。
- 前記分子内にC−N結合を持つモノマーは、(メタ)アクリルアミド、ジメチル(メタ)アクリルアミド、ジエチル(メタ)アクリルアミド、イソプロピル(メタ)アクリルアミド、ヒドロキシ(メタ)アクリルアミド、及び(メタ)アクリロイルモルホリンからなる群より選択される少なくとも1種である請求項1〜5のいずれかに記載の注射器用ガスケットの製造方法。
- 前記光ラジカル重合は、前記改質対象物の表面、又は前記ベンゾフェノン系化合物及び/又はチオキサントン系化合物が吸着若しくは共有結合した改質対象物の表面に、前記分子内にC−N結合を持つモノマー又はその溶液を接触させ、光を照射して重合を進行させる請求項3又は4記載の注射器用ガスケットの製造方法。
- 前記分子内にC−N結合を持つモノマー又はその溶液が重合禁止剤を含むもので、該重合禁止剤の存在下で重合させる請求項7記載の注射器用ガスケットの製造方法。
- 前記重合禁止剤が4−メチルフェノールである請求項8記載の注射器用ガスケットの製造方法。
- 前記ポリマー鎖の長さが10〜50000nmである請求項1〜9のいずれかに記載の注射器用ガスケットの製造方法。
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CN201310459308.8A CN103849002B (zh) | 2012-11-30 | 2013-09-24 | 表面改性弹性体 |
US14/077,829 US9752003B2 (en) | 2012-11-30 | 2013-11-12 | Surface-modified elastic body |
EP13195028.9A EP2743294B1 (en) | 2012-11-30 | 2013-11-29 | Surface-modified elastic body |
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EP2743294B1 (en) | 2015-09-23 |
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CN103849002B (zh) | 2019-06-18 |
CN103849002A (zh) | 2014-06-11 |
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US20140155510A1 (en) | 2014-06-05 |
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