JP2011005111A - 卓球ラバーのシートとスポンジの貼合わせ用水性接着剤及び卓球ラバーの製造方法 - Google Patents
卓球ラバーのシートとスポンジの貼合わせ用水性接着剤及び卓球ラバーの製造方法 Download PDFInfo
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- JP2011005111A JP2011005111A JP2009153278A JP2009153278A JP2011005111A JP 2011005111 A JP2011005111 A JP 2011005111A JP 2009153278 A JP2009153278 A JP 2009153278A JP 2009153278 A JP2009153278 A JP 2009153278A JP 2011005111 A JP2011005111 A JP 2011005111A
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- Prior art keywords
- table tennis
- sponge
- rubber
- tennis rubber
- sheet
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Abstract
【解決手段】ポリウレタン樹脂水分散液からなることを特徴とする揮発性有機化合物を含まない卓球ラバーのシート2とスポンジ1の貼合わせ用水性接着剤である。さらにスチレン−ブタジエン共重合体ラテックスを配合した事を特徴とする。スチレン−ブタジエン共重合体ラテックスのゲル分率は30%〜100%である。
【選択図】図1
Description
(1) ポリウレタン樹脂水分散液からなることを特徴とする揮発性有機化合物を含まない卓球ラバーのシートとスポンジの貼合わせ用水性接着剤。
(2) さらにスチレン−ブタジエン共重合体ラテックスを配合したことを特徴とする請求項1に記載の卓球ラバーのシートとスポンジの貼合わせ用水性接着剤。
(3) スチレン−ブタジエン共重合体ラテックスのゲル分率が30〜100%であることを特徴とする2項に記載の卓球ラバーのシートとスポンジの貼合わせ用水性接着剤。
(4) 1〜3項のいずれか1項に記載の卓球ラバーのシートとスポンジの貼合わせ用水性接着剤をシート及び/又はスポンジに塗布し、シートとスポンジを貼り合わせて乾燥することを特徴とする卓球ラバーの製造方法。
本発明に用いられるポリウレタン樹脂水分散液は、ポリウレタン樹脂が水系媒体に分散または乳化したものであればその製造方法は特に限定されないが、例えば、(1)ポリイソシアネート、ポリオールおよびカルボキシル基含有ポリオールを反応させて得られるカルボキシル基を含有するポリウレタンプレポリマーを三級アミン等により中和して水中に乳化分散させると同時に/または乳化分散させた後に、ポリアミン等の鎖伸長剤により高分子量化させて得られるポリウレタン樹脂水分散液、(2)ポリイソシアネートおよびポリオールを反応させて得られる末端イソシアネートプレポリマーを界面活性剤の存在下で水中に乳化分散させると同時に/または乳化分散させた後に、ポリアミン等の鎖伸長剤により高分子量化させて得られるポリウレタン樹脂水分散液、(3)前記(1)、(2)に記載のポリウレタンプレポリマーが有機溶剤存在下で合成され、乳化分散された後に必要に応じて有機溶剤を公知の方法で除去する方法によって得られるポリウレタン樹脂水分散液などを挙げることができる。
前記アニオン性界面活性剤としては、例えばアルキルベンゼンスルホン酸塩、ポリオキシエチレンアルキルフェニルスルホン酸塩、ポリオキシエチレンアルキルジフェニルエーテルスルホン酸塩、アルキルジフェニルエーテルジスルホン酸塩、コハク酸ジアルキルエステルスルホン酸塩等を使用することができる。
スチレン−ブタジエン共重合体ラテックスは、よく知られているように、芳香族ビニル系単量体と共役ジエン系単量体との共重合体からなるラテックスであり、本発明においては、そのような従来から公知の各種のスチレン−ブタジエン共重合体ラテックスが適宜に用いられることとなる。
これらの増粘剤は単独であっても二種以上を併用してもよい。
ポリウレタン樹脂水性分散液の製造方法
攪拌機、ジムロート冷却器、窒素導入管及び温度計を備えた4つ口フラスコに、分子量2,000のポリプロピレングリコール(三井化学(株)製、Diol-2000)100重量部を投入し、窒素気流下110℃にて脱水し、脱水後、60℃まで冷却を行った。その後、2,2−ジメチロールプロピオン酸1.6重量部、イソホロンジイソシアネート(ヒュルス社製、VESTANT IPDI)17.5重量部、アセトン70重量部を順次投入し、70〜90℃にてNCO%が1.22となるまで反応を行った。その後、40℃以下まで冷却し、トリエチルアミン1.2重量部を添加し中和を行いポリウレタンプレポリマー溶液を調製した。
アクリルエマルジョンの製造方法
容器にイオン交換水50重量部、ドデシル硫酸ナトリウム5重量部、アクリル酸1.5重量部、アクリル酸2‐エチルヘキシル52重量部、メタクリル酸メチル46.5重量部、10%過硫酸アンモニウム水溶液2.0重量部を秤量・攪拌し、モノマー乳化液を調整した。撹拌機、ジムロート冷却器、窒素導入管及び温度計を備えた4つ口フラスコに、イオン交換水50重量部を仕込み、攪拌しながら内温を75℃に加温し、モノマー乳化液10重量部と10%過硫酸アンモニウム水溶液を0.5重量部添加した。同温で残りのモノマー乳化液を滴下し3時間重合反応を行った。内温を保ちながら1時間後重合反応を行った。後重合反応終了後、室温に冷却し25%アンモニア水溶液を3重量部加えて中和し、粘度200mPa・s、不揮発分50.7%のアクリルエマルジョン(B)を得た。
製造例1で調整したポリウレタン樹脂水分散液(A)とスチレン−ブタジエン共重合体ラテックス(商品名「L7850」、商品名「A7269」、旭化成ケミカルズ(株)製)を表1に示す割合にて配合し(表1に記載した配合量は重量部を示す)、増粘剤(ポリアクリル酸エステルエマルジョン、商品名「プライマルASE60」、ローム&ハース(株)製)を添加し30分間攪拌し水性接着剤を調製した。なお、「L7850」のゲル分率は34%、「A7269」のゲル分率は50%であった。
製造例2で調整したアクリルエマルジョン(B)100重量部にプライマルASE60を0.5重量部添加し30分撹拌してアクリルエマルジョン接着剤(B−1)を調整した。
クロロプレンラテックス100重量部(商品名「スカイプレンラテックスSL−360」、東ソー(株)製、不揮発分約52%)にウレタン会合型増粘剤(ポリウレタン系樹脂、商品名アデカノールUH−420、(株)ADEKA製)0.5重量部を添加し30分間撹拌しクロロプレンラテックス系接着剤(C-1)を調整した。
クロロプレンゴムにトルエン72%、メチルエチルケトン8.9%配合したクロロプレンゴム系溶剤型接着剤を調製した。
<接着性>
評価
◎・・・引きはがそうとするとシートまたはスポンジが破壊。
○・・・引きはがそうとするとシートまたはスポンジが一部破壊。
×・・・接着せず。
実施例及び比較例の接着剤を使用し貼り合せた卓球ラバーを用いてラケットを作成し、使用した際の打感の良さを評価した。
評価
◎・・・打感が良好。
○・・・打感が好ましい。
×・・・打感が好ましくない。
接着剤をロールコーターにてスポンジに塗布した際の塗布性を作業性として評価した。
評価
○・・・良好に塗布できる。
×・・・塗布できない。
OK・・・ラケット検査機が反応しない(VOC無し)。
NG・・・ラケット検査機が反応する(VOC有り)。
2:シート
Claims (4)
- ポリウレタン樹脂水分散液からなることを特徴とする揮発性有機化合物を含まない卓球ラバーのシートとスポンジの貼合わせ用水性接着剤。
- さらにスチレン−ブタジエン共重合体ラテックスを配合したことを特徴とする請求項1に記載の卓球ラバーのシートとスポンジの貼合わせ用水性接着剤。
- スチレン−ブタジエン共重合体ラテックスのゲル分率が30〜100%であることを特徴とする請求項2に記載の卓球ラバーのシートとスポンジの貼合わせ用水性接着剤。
- 請求項1〜3のいずれか1項に記載の卓球ラバーのシートとスポンジの貼合わせ用水性接着剤をシート及び/又はスポンジに塗布し、シートとスポンジを貼り合わせて乾燥することを特徴とする卓球ラバーの製造方法。
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