JP2004043666A - One-part water-based adhesive composition - Google Patents
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Description
【０００１】
【発明の属する技術分野】
本発明は、少なくとも一方が多孔質または水分を透過する被着材の一方もしくは両方にエアスプレー、ロールコーター、刷毛などにて塗工し貼り合わせて使用する一液型の１液型水性接着剤組成物に関し、更に詳しくは、水系でありながら充分な初期接着強さを発揮し、かつ優れた保存安定性を有する、特に吸水性を有するウレタンフォーム、布地等の接着に好適な１液型水性接着剤組成物に関する。
【０００２】
【従来の技術】
従来から、被着体を接着するには、被着体に接着剤を塗布し貼り合わせ、その直後から高い接着強さ（即ち、初期接着強さ）を発現する有機溶剤型クロロプレンゴム系接着剤が広く使用されている。しかしながら、有機溶剤は引火性が高く、さらには人体に有害な物質であり安全性、環境面からも好ましくなく、脱溶剤化の要求があった。
そこで、脱溶剤化の手段として、各種ポリマーを対象とした２液型エマルジョン接着剤の研究が盛んに行われた。この２液型エマルジョン接着剤は、例えば、特開昭５５−１４９３６３号公報に紹介されるように、ポリマーエマルジョンの主剤に金属塩水溶液等のゲル化剤を接触させエマルジョンを強制塩析させてポリマー被膜を形成させ、湿潤状態で所定の初期接着強さを得ようとするものである。しかしながら、この２液型エマルジョン接着剤は、２液型で特殊な塗布設備を必要とする他、接着剤の混合比率が一定しない（混合ぶれ）等の理由で接着作業の安定性が得られない問題があった。
また、一方で、スプレー塗布性の１液型エマルジョン接着剤も検討された（例えば、特開平４−２９８５３６号公報、特開平１０−１９５４０６号公報、特開平１２−２１９８５９号公報）が、湿潤状態での初期接着強さが充分でない上、接着剤の長期貯蔵安定性も不充分であるため長期に亘る保存、取り扱いに問題があった。
【０００３】
【発明が解決しようとする課題】
本発明の課題
（目的）は、このような従来技術の問題を解決して、湿潤状態での初期接着強さが充分であり、かつ長期保存安定性に優れた１液型水性接着剤組成物を提供することにある。
【０００４】
【課題を解決するための手段】
本発明者らは上記の課題
（目的）を解決すべく鋭意研究を重ねた結果、アニオン型界面活性剤存在下で重合し得られるアニオン型クロロプレンゴムラテックスを使用し、このｐＨ調整をアミノ酸（好ましくは、グリシン、β−アラニン）にて行い、且つ強酸弱塩基性塩を添加することで、湿潤状態での初期接着強さ（以下、単に初期接着強さという。）さが充分であり、優れた長期保存安定性を有する１液型水性接着組成物を見出し、本発明を完成させるに至った。
【０００５】
即ち、本発明は、
（１）（ａ）アニオン型クロロプレンゴムラテックスに対し、その固形分１００重量部当たり、（ｂ）アミノ酸を１〜１０部、（ｃ）強酸弱塩基性塩０．０１〜２重量部を配合してなることを特徴とする１液型水性接着剤組成物、
（２）（ｂ）アミノ酸が、グリシンであることを特徴とする（１）記載の１液型水性接着剤組成物、
（３）（ｂ）アミノ酸が、β−アラニンであることを特徴とする（１）記載の１液型水性接着剤組成物、
（４）強酸弱塩基性塩が、塩化アンモニウム、硫酸アンモニウム、硝酸アンモニウム、リン酸２水素アンモニウム、リン酸２水素ナトリウム、リン酸２水素カリウム、リン酸２水素カルシウムの中から選択される１種以上であることを特徴とする（１）〜（３）のいずれか１に記載の１液型水性接着剤組成物。
【０００６】
（５）さらに、（ａ）アニオン型クロロプレンゴムラテックスの固形分１００重量部当たり、（ｄ）粘着付与性樹脂エマルジョンを固形分換算で１〜５０重量部配合してなることを特徴とする（１）〜（４）のいずれか１に記載の１液型水性接着剤組成物、
（６）さらに、（ａ）アニオン型クロロプレンゴムラテックスの固形分１００重量部当たり、（ｅ）ポリマーエマルジョンを固形分換算で１〜１００重量部を配合してなることを特徴とする（１）〜（５）のいずれか１に記載の１液型水性接着剤組成物、
（７）さらに、（ａ）アニオン型クロロプレンゴムラテックスの固形分１００重量部当たり、（ｆ）可塑剤０． １〜３０重量部を配合してなることを特徴とする（１）〜（６）のいずれか１に記載の１液型水性接着剤組成物である。
【０００７】
【発明の実施の形態】
以下に、本発明の各構成について、詳しく説明する。
（ａ）アニオン型クロロプレンゴムラテックス
アニオン型ポリクロロプレンラテックスとしては、アニオン型乳化剤、例えば、ロジン酸塩を使用して重合して得られるエマルジョンで、固形分濃度は、通常４０〜７０重量％のものが使用される。
このアニオン型クロロプレンゴムラテックスとしては各種のものが上市されており、適宜それらを使用することができる。
【０００８】
（ｂ）アミノ酸
アニオン型クロロプレンゴムラテックスのｐＨを調整（低下）するアミノ酸としては、グリシン、アラニン、フェニルアラニン、グルタミン酸があるが、中でもグリシン、β−アラニン（α−アラニンは不溶性である）が好ましく、特にβ−アラニンが好ましい。
このｐＨ調整用アミノ酸の配合量は、（ａ）アニオン型クロロプレンゴムラテックスの固形分１００重量部当たり、１〜１０重量部、好ましくは３〜７重量部である。
アミノ酸の配合量が１重量部未満ではｐＨ調整が不十分で目的の初期接着強さが得られ難いため好ましくなく、また、１０重量部を超えると配合安定性が損なわれる可能性がある他、配合に見合った効果が得られないため、やはり好ましくない。
【０００９】
（ｃ）強酸弱塩基性塩
ｐＨ調整用のアミノ酸と共に用いられて優れた初期接着性と長期貯蔵安定性を発現させる強酸弱塩基性塩としては、具体的には、塩化アンモニウム、硫酸アンモニウム、硝酸アンモニウム、リン酸２水素アンモニウム、リン酸２水素ナトリウム、リン酸２水素カリウム、リン酸２水素カルシウムがあり、中でも塩化アンモニウム、硝酸アンモニウム、リン酸２水素アンモニウムが好ましい。
この強酸弱塩基性塩の配合量は、（ａ）アニオン型クロロプレンゴムラテックスの固形分１００重量部当たり、０． ０１〜２重量部、好ましくは０． ０３〜１．５重量部である。
強酸弱塩基性塩の配合量が０． ０１重量部未満では初期接着強さの発現に対する効果が得られない可能性があるため好ましくなく、また、２重量部を超えるとアニオン型クロロプレンゴムラテックスが急激な凝集を引き起こし配合不能となる可能性があるため、やはり好ましくない。
【００１０】
（ｄ）粘着付与性樹脂エマルジョン
粘着付与性樹脂エマルジョンの具体例としては、ロジンフェノール樹脂、ロジンエステル樹脂、水添ロジン樹脂、重合ロジン樹脂、α−ピネン樹脂、β−ピネン樹脂、テルペンフェノール樹脂、石油樹脂、アルキルフェノール樹脂、キシレン樹脂、クマロン樹脂、クマロンインデン樹脂等の中から選択される１種以上があり、中でもロジンフェノール樹脂、ロジンエステル樹脂のエマルジョンが好ましい。
粘着付与性樹脂エマルジョンの添加は、本発明の１液型水性接着剤組成物の被着体の適用範囲を広げることができる。
粘着付与性樹脂エマルジョンの配合量は、（ａ）アニオン型クロロプレンゴムラテックスの固形分１００重量部当たり、その固形分換算で１〜５０重量部、好ましくは５〜３０重量部である。
粘着付与性樹脂エマルジョンの配合量（固形分換算）が１重量部未満では種々の被着材料に対する十分な効果が得られない可能性があるため好ましくなく、また、５０重量部（固形分換算）を超えると樹脂エマルジョン自体が有する余剰乳化剤が初期接着性に悪影響を与える可能性があるため、やはり好ましくない。
【００１１】
（ｅ）ポリマーエマルジョン
ポリマーエマルジョンの具体例としては、アクリル樹脂エマルジョン、ウレタン樹脂エマルジョン、スチレン／ブタジエンゴムラテックス、アクリルニトリル／ブタジエンゴムラテックス、天然ゴムラテックス等の中から選択される１種以上があり、中でもアクリル樹脂エマルジョン、ウレタン樹脂エマルジョン、スチレン／ブタジエンゴムラテックスが好ましい。
ポリマーエマルジョンの添加は、（ｄ）粘着付与性樹脂エマルジョンと同様に本発明の１液型水性接着剤組成物の被着体の適用範囲を広げることができる。
ポリマーエマルジョンの配合量は、（ａ）アニオン型クロロプレンゴムラテックスの固形分１００重量部当たり、その固形分換算で１〜１００重量部、好ましくは１０〜５０重量部である。
ポリマーエマルジョンの配合量（固形分換算）が１重量部未満では粘着付与樹脂と同様に種々の被着材に対する十分な効果が得られない可能性があるため好ましくなく、また、５０重量部（固形分換算）を超えるとポリマーエマルジョン自体が有する余剰乳化剤が初期接着性に悪影響を与える可能性があるため、やはり好ましくない。
【００１２】
（ｆ）可塑剤
可塑剤の具体例としては、二塩基酸エステル系可塑剤（例えば、フタル酸ジメチル、フタル酸ジエチル、フタル酸ジブチル、フタル酸ジオクチル、フマル酸ジブチル、マレイン酸ジブチル、アジピン酸ジメチル、アジピン酸ジエチル、アジピン酸ジブチル、アジピン酸ジオクチル、セバシン酸ジメチル、セバシン酸ジブチル等）、トリメリット酸オクチルのような三塩基酸エステル系、アロマオイルのような石油系炭化水素可塑剤、ナフテン系オイル等があるが、二塩基酸エステル系可塑剤が好ましい。
可塑剤の添加は、本発明の１液型水性接着剤組成物の被着体の適用範囲を広げ、さらに接着剤皮膜の柔軟化を図ることができる。
可塑剤の配合量は、（ａ）アニオン型クロロプレンゴムラテックスの固形分１００重量部当たり、０． １〜３０重量部、好ましくは５〜２０重量部である。
可塑剤の配合量が０． １重量部未満では配合接着剤に対する可塑効果が十分でなく目的とする効果が得られない可能性があるため好ましくなく、また、３０重量部を超えると配合安定性が著しく低下し、分離の可能性がある。更にアニオン系クロロプレンゴムラテックスが必要以上に可塑化されてしまい接着皮膜の耐熱性が損なわれる可能性があるため、やはり好ましくない。
【００１３】
（ｇ）その他の添加剤
その他の添加剤として、酸化亜鉛など金属酸化物、炭酸カルシウムやシリカなどの無機充填剤、各種老化防止剤、硬化剤、増粘剤、着色剤等の常用の添加剤を必要に応じて含むことが出来る。
（ｆ）用途
本発明の１液型水性接着剤組成物は、多孔質または水分を透過する被着材、例えば、紙、木材、布、皮革、レザー、フォーム等同志、又はこれらと陶器、ガラス、セラミック、金属などの異種被着材との接着用として好適である。接着時の施工方法は、刷毛塗り、コテ塗り、スプレー塗布、ロールコーター塗布などが可能であるが、スプレー塗布による方法が作業性において優れている。
【００１４】
【実施例】
▲１▼［初期接着性の評価方法］
ウレタンフォームの接着面両面に試験接着剤をエアスプレー塗布し、室温下にて３分間放置後接着剤塗布面同士を貼り合わせハンドローラーを用い圧締を行う。その後直ちに接着面を引きはがしその際の接着性で判断した。
○：ウレタンフォームの材料破壊を伴い接着性良好
△：ウレタンフォームの材料破壊はないが実用上問題ない接着強さを有する。
×：接着面が容易にはく離し、接着強さが得られない。
▲２▼［長期保存安定性の評価方法］
試験接着剤をポリエチレン製５００ｍｌ瓶に充填し、これを５０℃に調温した温蔵庫に１ケ月保管し接着剤の状態に変化がないか観察した。
Ａ：保存前と変化なし
Ｂ：若干粘度変化が認められるが実用上問題なし
Ｃ：接着剤成分の沈殿及び凝集がみられる。
【００１５】
（実施例１）
アニオン型クロロプレンゴムラテックス［バイエル（株）製 商品名：ディスパコールＣ−８４（以下、「Ｃ−８４」と略記する。） 不揮発分５５％ ｐＨ１３．０］１００重量部を仕込み、撹拌しながら序々に塩化アンモニウム０．２重量部、グリシン５重量部を添加し室温で０．５時間撹拌溶解後、不揮発分５５％の水性接着剤を得た。
（実施例２）
アニオン型クロロプレンゴムラテックス（「Ｃ−８４」）１００重量部を仕込み、撹拌しながら序々に塩化アンモニウム０．２重量部、β−アラニン３重量部を添加し室温で０．５時間撹拌溶解後、不揮発分５５％の水性接着剤を得た。
【００１６】
（実施例３）
アニオン型クロロプレンゴムラテックス（「Ｃ−８４」）１００重量部を仕込み、撹拌しながら序々にリン酸２水素アンモニウム１重量部、β−アラニン３重量部を添加し室温で０．５時間撹拌溶解後、不揮発分５５％の水性接着剤を得た。
（実施例４）
アニオン型クロロプレンゴムラテックス（「Ｃ−８４」）１００重量部を仕込み、撹拌しながら序々に硝酸アンモニウム０．２重量部、β−アラニン３重量部を添加し室温で０．５時間撹拌溶解後、不揮発分５５％の水性接着剤を得た。
（実施例５）
アニオン型クロロプレンゴムラテックス（「Ｃ−８４」）１００重量部を仕込み、撹拌しながら序々に塩化アンモニウム０．２重量部、β−アラニン３重量部を添加し室温で０．５時間撹拌溶解した。その後ジブチルセバケート（「ＤＢＳ」）を５重量部添加した後に１時間撹拌して不揮発分５５％の水性接着剤を得た。
【００１７】
（比較例１）
アニオン型クロロプレンゴムラテックス（「Ｃ−８４」）１００重量部を仕込み、撹拌しながら序々にα−アラニン３重量部を添加し室温で２時間撹拌溶解を試みたがα−アラニンが不溶のため製造不可能であった。
（比較例２）
アニオン型クロロプレンゴムラテックス（「Ｃ−８４」）１００重量部を仕込み、撹拌しながら序々にグリシン５重量部を添加し室温で０．５時間撹拌溶解後、不揮発分５５％の水性接着剤を得た。
（比較例３）
アニオン型クロロプレンゴムラテックス（「Ｃ−８４」）１００重量部を仕込み、撹拌しながら序々にβ−アラニン３重量部を添加し室温で０．５時間撹拌溶解後、不揮発分５５％の水性接着剤を得た。
【００１８】
（比較例４）
アニオン型クロロプレンゴムラテックス（「Ｃ−８４」）１００重量部を仕込み、撹拌しながら序々に塩化アンモニウム０．２重量部を添加し室温で０．５時間撹拌溶解後、不揮発分５５％の水性接着剤を得た。
（比較例５）
アニオン型クロロプレンゴムラテックス（「Ｃ−８４」）１００重量部を仕込み、撹拌しながら序々にリン酸２水素アンモニウム１重量部を添加し室温で０．５時間撹拌溶解後、不揮発分５５％の水性接着剤を得た。
（比較例６）
アニオン型クロロプレンゴムラテックス（「Ｃ−８４」）１００重量部を仕込み、撹拌しながら序々に硝酸アンモニウム０．２重量部を添加し室温で０．５時間撹拌溶解後、不揮発分５５％の水性接着剤を得た。
（比較例７）
アニオン型クロロプレンゴムラテックス（「Ｃ−８４」）１００重量部を仕込み、撹拌しながら序々に無機酸である塩酸０．２重量部を添加し室温で０．５時間撹拌溶解後、不揮発分５５％の水性接着剤を得た。
【００１９】
（比較例８）
アニオン型クロロプレンゴムラテックス（「Ｃ−８４」）１００重量部を仕込み、撹拌しながら序々に有機酸であるクエン酸０．２重量部を添加し室温で０．５時間撹拌溶解後、不揮発分５５％の水性接着剤を得た。
（比較例９）
アニオン型クロロプレンゴムラテックス（「Ｃ−８４」）１００重量部を仕込み、撹拌しながら序々に塩化ナトリウム０．２重量部、β−アラニン３重量部を添加し室温で０．５時間撹拌溶解後、不揮発分５５％の水性接着剤を得た。
（比較例１０）
アニオン型クロロプレンゴムラテックス（「Ｃ−８４」）１００重量部を仕込み、撹拌しながら序々にトリエタノールアミン０．２重量部、β−アラニン３重量部を添加し室温で０．５時間撹拌溶解後、不揮発分５５％の水性接着剤を得た。
以上の実施例１〜５、比較例１〜１０の水性接着剤について、上記▲１▼［初期接着性の評価方法］及び▲２▼［長期保存安定性の評価方法］を行った。その結果は次の表１に示されている。
【００２０】
【表１】
【発明の効果】
本発明によれば、水性接着剤でありながら塗布後直ちに充分な初期接着強さを発揮し、かつ優れた長期保存安定性を有し、更により広範囲の被着体に適用可能な水性接着剤組成物を提供することができる。[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a one-part type one-part aqueous adhesive which is applied to one or both of an adherend, at least one of which is porous or permeable to moisture, by an air spray, a roll coater, a brush, etc. More specifically, the composition is a one-component aqueous solution which exhibits sufficient initial adhesive strength while being water-based and has excellent storage stability, and is particularly suitable for bonding urethane foams and fabrics having water absorbency. It relates to an adhesive composition.
[0002]
[Prior art]
Conventionally, to bond an adherend, an organic solvent-type chloroprene rubber-based adhesive that develops a high adhesive strength (ie, an initial adhesive strength) immediately after applying and bonding an adhesive to the adherend. Is widely used. However, organic solvents are highly flammable and are harmful to the human body, and are not preferred in terms of safety and environment, and there has been a demand for solvent removal.
Accordingly, as a means for removing the solvent, research on a two-pack type emulsion adhesive for various polymers has been actively conducted. For example, as disclosed in Japanese Patent Application Laid-Open No. 55-149363, this two-part emulsion adhesive is prepared by bringing a gelling agent such as an aqueous solution of a metal salt into contact with a main component of a polymer emulsion and forcibly salting out the emulsion. A film is formed to obtain a predetermined initial adhesive strength in a wet state. However, this two-part type emulsion adhesive is a two-part type, requires special coating equipment, and does not provide a stable bonding operation because the mixing ratio of the adhesive is not constant (mixing fluctuation). There was a problem.
On the other hand, spray-coatable one-component emulsion adhesives have also been studied (for example, JP-A-4-298536, JP-A-10-195406, and JP-A-12-219859). And the long-term storage stability of the adhesive was insufficient, so that there was a problem in long-term storage and handling.
[0003]
[Problems to be solved by the invention]
An object (object) of the present invention is to solve such a problem of the prior art, and to provide a one-part aqueous adhesive composition having a sufficient initial adhesive strength in a wet state and excellent long-term storage stability. Is to provide.
[0004]
[Means for Solving the Problems]
The present inventors have conducted intensive studies to solve the above-mentioned problems (objects). As a result, the present inventors have used an anionic chloroprene rubber latex obtained by polymerization in the presence of an anionic surfactant, and adjusted the pH with amino acids (preferably). Is carried out with glycine and β-alanine), and by adding a strong acid weakly basic salt, the initial adhesive strength in a wet state (hereinafter, simply referred to as initial adhesive strength) is sufficient and excellent. The present inventors have found a one-pack type aqueous adhesive composition having long-term storage stability and have completed the present invention.
[0005]
That is, the present invention
(1) To (a) anionic chloroprene rubber latex, (b) 1 to 10 parts of an amino acid and (c) 0.01 to 2 parts by weight of a strong acid weak base salt per 100 parts by weight of the solid content. A one-part aqueous adhesive composition,
(2) The one-component aqueous adhesive composition according to (1), wherein the amino acid is glycine.
(3) The one-component aqueous adhesive composition according to (1), wherein the (b) amino acid is β-alanine.
(4) The strong acid weakly basic salt is at least one selected from ammonium chloride, ammonium sulfate, ammonium nitrate, ammonium dihydrogen phosphate, sodium dihydrogen phosphate, potassium dihydrogen phosphate, and calcium dihydrogen phosphate. The one-component aqueous adhesive composition according to any one of (1) to (3), wherein
[0006]
(5) Further, 1 to 50 parts by weight of (d) a tackifier resin emulsion is added per 100 parts by weight of the solid content of the anionic chloroprene rubber latex in terms of the solid content. 1) The one-part aqueous adhesive composition according to any one of (4) to (4),
(6) Further, (1) to (1) to (1) to (1) to 100 to 100 parts by weight of the polymer emulsion in terms of the solid content are blended with respect to 100 parts by weight of the solid content of the anionic chloroprene rubber latex. (5) the one-part aqueous adhesive composition according to any one of (1) to (5),
(7) Further, (a) 0.1% of plasticizer (f) per 100 parts by weight of solid content of anionic chloroprene rubber latex. The one-component aqueous adhesive composition according to any one of (1) to (6), wherein 1 to 30 parts by weight is blended.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, each configuration of the present invention will be described in detail.
(A) Anionic chloroprene rubber latex Anionic polychloroprene latex is an emulsion obtained by polymerization using an anionic emulsifier, for example, a rosinate, and has a solid content concentration of usually 40 to 70% by weight. Is used.
Various anion-type chloroprene rubber latexes are on the market, and they can be used as appropriate.
[0008]
(B) Amino acids Amino acids that adjust (lower) the pH of the anionic chloroprene rubber latex include glycine, alanine, phenylalanine, and glutamic acid, with glycine and β-alanine being preferred (α-alanine is insoluble), Particularly, β-alanine is preferred.
The amount of the amino acid for pH adjustment is 1 to 10 parts by weight, preferably 3 to 7 parts by weight, per 100 parts by weight of the solid content of the (a) anionic chloroprene rubber latex.
If the amount of the amino acid is less than 1 part by weight, the pH adjustment is insufficient and the desired initial adhesive strength is hardly obtained, which is not preferable. If the amount exceeds 10 parts by weight, the compounding stability may be impaired. This is not preferable because the effect corresponding to the composition cannot be obtained.
[0009]
(C) Strong acid weak basic salt The strong acid weak basic salt used together with the amino acid for pH adjustment to exhibit excellent initial adhesiveness and long-term storage stability includes, specifically, ammonium chloride, ammonium sulfate, ammonium nitrate, There are ammonium dihydrogen phosphate, sodium dihydrogen phosphate, potassium dihydrogen phosphate and calcium dihydrogen phosphate, and among them, ammonium chloride, ammonium nitrate and ammonium dihydrogen phosphate are preferable.
The amount of the strong acid weakly basic salt to be added is 0.1 to 100 parts by weight of the solid content of the (a) anionic chloroprene rubber latex. 0.01 to 2 parts by weight, preferably 0.1 to 2 parts by weight. 03 to 1.5 parts by weight.
When the amount of the strong acid weak basic salt is 0. If the amount is less than 01 parts by weight, there is a possibility that the effect on the development of the initial adhesive strength may not be obtained, so that it is not preferable. It is not preferable because there is.
[0010]
(D) Tackifying resin emulsion Specific examples of the tackifying resin emulsion include rosin phenol resin, rosin ester resin, hydrogenated rosin resin, polymerized rosin resin, α-pinene resin, β-pinene resin, terpene phenol resin, There is at least one selected from petroleum resins, alkylphenol resins, xylene resins, cumarone resins, cumarone indene resins, and the like, and among them, emulsions of rosin phenol resins and rosin ester resins are preferable.
The addition of the tackifier resin emulsion can broaden the application range of the adherend of the one-component aqueous adhesive composition of the present invention.
The compounding amount of the tackifying resin emulsion is 1 to 50 parts by weight, preferably 5 to 30 parts by weight in terms of the solid content per 100 parts by weight of the solid content of the (a) anionic chloroprene rubber latex.
If the compounding amount (solid content) of the tackifying resin emulsion is less than 1 part by weight, there is a possibility that a sufficient effect on various adherend materials may not be obtained, so that it is not preferable, and 50 parts by weight (solid content). When the value exceeds the above, the excess emulsifier contained in the resin emulsion itself may adversely affect the initial adhesiveness, which is also not preferable.
[0011]
(E) Polymer emulsion Specific examples of the polymer emulsion include at least one selected from acrylic resin emulsion, urethane resin emulsion, styrene / butadiene rubber latex, acrylonitrile / butadiene rubber latex, natural rubber latex, and the like. Among them, acrylic resin emulsions, urethane resin emulsions, and styrene / butadiene rubber latex are preferred.
The addition of the polymer emulsion can broaden the application range of the adherend of the one-component aqueous adhesive composition of the present invention, similarly to (d) the tackifying resin emulsion.
The compounding amount of the polymer emulsion is 1 to 100 parts by weight, preferably 10 to 50 parts by weight in terms of the solid content per 100 parts by weight of the solid content of the (a) anionic chloroprene rubber latex.
If the blending amount (solid content) of the polymer emulsion is less than 1 part by weight, there is a possibility that a sufficient effect on various adherends may not be obtained as in the case of the tackifier resin. (Equivalent to minutes) is not preferable because the excess emulsifier contained in the polymer emulsion itself may adversely affect the initial adhesiveness.
[0012]
(F) Specific examples of the plasticizer plasticizer include dibasic ester plasticizers (for example, dimethyl phthalate, diethyl phthalate, dibutyl phthalate, dioctyl phthalate, dibutyl fumarate, dibutyl maleate, dimethyl adipate) Tribasic esters such as octyl trimellitate, petroleum hydrocarbon plasticizers such as aroma oil, and naphthenics. Although there are oils and the like, dibasic acid ester-based plasticizers are preferred.
The addition of the plasticizer can broaden the application range of the adherend of the one-component aqueous adhesive composition of the present invention, and can further soften the adhesive film.
The amount of the plasticizer to be added is 0.1 to 100 parts by weight of the solid content of the (a) anionic chloroprene rubber latex. It is 1 to 30 parts by weight, preferably 5 to 20 parts by weight.
The amount of the plasticizer is 0. If the amount is less than 1 part by weight, the plasticizing effect on the compounded adhesive may not be sufficient, and the desired effect may not be obtained. There is. Further, the anionic chloroprene rubber latex is undesirably plasticized more than necessary, and the heat resistance of the adhesive film may be impaired.
[0013]
(G) Other additives As other additives, common additives such as metal oxides such as zinc oxide, inorganic fillers such as calcium carbonate and silica, various anti-aging agents, curing agents, thickeners and coloring agents. Can be included as needed.
(F) Uses The one-component aqueous adhesive composition of the present invention is a porous or moisture-permeable adherend, such as paper, wood, cloth, leather, leather, foam, etc., or ceramic and glass. It is suitable for bonding to different kinds of adherends such as ceramic, metal and the like. The application method at the time of bonding can be brush coating, iron coating, spray coating, roll coater coating, or the like, but the method of spray coating is excellent in workability.
[0014]
【Example】
(1) [Evaluation method of initial adhesiveness]
The test adhesive is applied to both surfaces of the urethane foam by air spray, left at room temperature for 3 minutes, and the adhesive applied surfaces are bonded to each other and pressed with a hand roller. Immediately thereafter, the adhesive surface was peeled off and judged by the adhesiveness at that time.
：: Good adhesiveness accompanied by material destruction of urethane foam. 破 壊: Adhesion strength that does not cause any practical problem although there is no material destruction of urethane foam.
X: The adhesive surface was easily peeled off, and no adhesive strength was obtained.
(2) [Evaluation method for long-term storage stability]
The test adhesive was filled in a polyethylene bottle of 500 ml and stored for one month in a refrigerator kept at 50 ° C., and observed for any change in the state of the adhesive.
A: No change from before storage B: A slight change in viscosity is observed but no practical problem C: Precipitation and aggregation of the adhesive component are observed.
[0015]
(Example 1)
Anion-type chloroprene rubber latex [trade name: Dispacoll C-84 (hereinafter abbreviated as “C-84”) manufactured by Bayer K.K.] 100 parts by weight of a non-volatile content 55% pH 13.0 are charged and gradually stirred. Then, 0.2 parts by weight of ammonium chloride and 5 parts by weight of glycine were added, and the mixture was stirred and dissolved at room temperature for 0.5 hour to obtain an aqueous adhesive having a nonvolatile content of 55%.
(Example 2)
100 parts by weight of an anionic chloroprene rubber latex (“C-84”) were charged, and 0.2 parts by weight of ammonium chloride and 3 parts by weight of β-alanine were gradually added with stirring, and the mixture was stirred and dissolved at room temperature for 0.5 hour. An aqueous adhesive having a nonvolatile content of 55% was obtained.
[0016]
(Example 3)
100 parts by weight of an anionic chloroprene rubber latex (“C-84”) are charged, and 1 part by weight of ammonium dihydrogen phosphate and 3 parts by weight of β-alanine are gradually added with stirring, and after stirring and melting at room temperature for 0.5 hour, Thus, an aqueous adhesive having a nonvolatile content of 55% was obtained.
(Example 4)
100 parts by weight of an anionic chloroprene rubber latex (“C-84”) were charged, and 0.2 parts by weight of ammonium nitrate and 3 parts by weight of β-alanine were gradually added with stirring, and dissolved by stirring at room temperature for 0.5 hour. A 55% min aqueous adhesive was obtained.
(Example 5)
100 parts by weight of an anionic chloroprene rubber latex (“C-84”) were charged, and 0.2 parts by weight of ammonium chloride and 3 parts by weight of β-alanine were gradually added with stirring, and the mixture was stirred and dissolved at room temperature for 0.5 hour. Thereafter, 5 parts by weight of dibutyl sebacate ("DBS") was added, followed by stirring for 1 hour to obtain an aqueous adhesive having a nonvolatile content of 55%.
[0017]
(Comparative Example 1)
100 parts by weight of anionic chloroprene rubber latex (“C-84”) were charged, and 3 parts by weight of α-alanine were gradually added with stirring, and the mixture was stirred and dissolved at room temperature for 2 hours. However, α-alanine was insoluble. It was impossible.
(Comparative Example 2)
100 parts by weight of an anionic chloroprene rubber latex (“C-84”) were charged, 5 parts by weight of glycine were gradually added with stirring, and the mixture was stirred and dissolved at room temperature for 0.5 hour to obtain an aqueous adhesive having a nonvolatile content of 55%. Was.
(Comparative Example 3)
100 parts by weight of an anionic chloroprene rubber latex (“C-84”) were charged, and 3 parts by weight of β-alanine were gradually added with stirring, and the mixture was stirred and dissolved at room temperature for 0.5 hour. Got.
[0018]
(Comparative Example 4)
100 parts by weight of an anionic chloroprene rubber latex (“C-84”) is charged, and 0.2 parts by weight of ammonium chloride is gradually added with stirring, and the mixture is dissolved by stirring at room temperature for 0.5 hour. Agent was obtained.
(Comparative Example 5)
100 parts by weight of an anionic chloroprene rubber latex (“C-84”) were charged, and 1 part by weight of ammonium dihydrogen phosphate was gradually added with stirring, and the mixture was dissolved by stirring at room temperature for 0.5 hour. An adhesive was obtained.
(Comparative Example 6)
100 parts by weight of an anionic chloroprene rubber latex (“C-84”) was charged, and 0.2 parts by weight of ammonium nitrate was gradually added with stirring, followed by stirring and dissolving at room temperature for 0.5 hour. Got.
(Comparative Example 7)
100 parts by weight of an anionic chloroprene rubber latex (“C-84”) were charged, and 0.2 parts by weight of hydrochloric acid, which was an inorganic acid, was gradually added with stirring, and the mixture was stirred and dissolved at room temperature for 0.5 hour. Was obtained.
[0019]
(Comparative Example 8)
100 parts by weight of an anionic chloroprene rubber latex ("C-84") were charged, and 0.2 parts by weight of an organic acid, citric acid, was gradually added with stirring, and dissolved by stirring at room temperature for 0.5 hour. % Of an aqueous adhesive was obtained.
(Comparative Example 9)
100 parts by weight of an anionic chloroprene rubber latex (“C-84”) were charged, and 0.2 parts by weight of sodium chloride and 3 parts by weight of β-alanine were gradually added with stirring, and dissolved by stirring at room temperature for 0.5 hour. An aqueous adhesive having a nonvolatile content of 55% was obtained.
(Comparative Example 10)
100 parts by weight of an anionic chloroprene rubber latex (“C-84”) were charged, and 0.2 parts by weight of triethanolamine and 3 parts by weight of β-alanine were gradually added with stirring, and then dissolved by stirring at room temperature for 0.5 hour. Thus, an aqueous adhesive having a nonvolatile content of 55% was obtained.
With respect to the aqueous adhesives of Examples 1 to 5 and Comparative Examples 1 to 10, the above-mentioned (1) [Evaluation method of initial adhesiveness] and (2) [Evaluation method of long-term storage stability] were performed. The results are shown in Table 1 below.
[0020]
[Table 1]
【The invention's effect】
According to the present invention, while being a water-based adhesive, it exhibits a sufficient initial adhesive strength immediately after application, and has excellent long-term storage stability, and can be applied to an even wider range of adherends. A composition can be provided.
Claims (7)
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| JP2002204239A JP4274752B2 (en) | 2002-07-12 | 2002-07-12 | One-component water-based adhesive composition |
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| JP2002204239A JP4274752B2 (en) | 2002-07-12 | 2002-07-12 | One-component water-based adhesive composition |
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Cited By (8)
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| JP2006057002A (en) * | 2004-08-20 | 2006-03-02 | Aica Kogyo Co Ltd | Aqueous adhesive composition |
| WO2009128718A1 (en) * | 2008-04-15 | 2009-10-22 | Bison International B.V. | Container filled with an adhesive or sealant |
| WO2011065524A1 (en) | 2009-11-30 | 2011-06-03 | 昭和電工株式会社 | Chloroprene polymer latex composition and use thereof |
| US20130123400A1 (en) * | 2010-07-09 | 2013-05-16 | Alfa Klebstoffe Ag | Adhesive with buffer system |
| US9023948B2 (en) | 2012-03-19 | 2015-05-05 | Showa Denko K.K. | Chloroprene rubber-based polymer latex composition and use thereof |
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| JP2006057002A (en) * | 2004-08-20 | 2006-03-02 | Aica Kogyo Co Ltd | Aqueous adhesive composition |
| WO2009128718A1 (en) * | 2008-04-15 | 2009-10-22 | Bison International B.V. | Container filled with an adhesive or sealant |
| WO2011065524A1 (en) | 2009-11-30 | 2011-06-03 | 昭和電工株式会社 | Chloroprene polymer latex composition and use thereof |
| US20130123400A1 (en) * | 2010-07-09 | 2013-05-16 | Alfa Klebstoffe Ag | Adhesive with buffer system |
| US9150708B2 (en) * | 2010-07-09 | 2015-10-06 | Alfa Klebstoffe Ag | Adhesive with buffer system |
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| WO2016133190A1 (en) * | 2015-02-19 | 2016-08-25 | デンカ株式会社 | Latex composition and one-pack aqueous adhesive |
| JPWO2016133190A1 (en) * | 2015-02-19 | 2017-11-30 | デンカ株式会社 | Latex composition and one-part aqueous adhesive |
| JP2020111626A (en) * | 2019-01-08 | 2020-07-27 | 東ソー株式会社 | Chloroprene latex composition and application method |
| CN114231209A (en) * | 2021-12-28 | 2022-03-25 | 江苏奥斯佳材料科技股份有限公司 | Rapid-bonding water-based glue and preparation method thereof |
| CN114231209B (en) * | 2021-12-28 | 2023-09-26 | 江苏奥斯佳材料科技股份有限公司 | Quick-bonding water-based glue and preparation method thereof |
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