JP3803942B2 - Defoamer for non-aqueous coating materials - Google Patents
Defoamer for non-aqueous coating materials Download PDFInfo
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- JP3803942B2 JP3803942B2 JP22249897A JP22249897A JP3803942B2 JP 3803942 B2 JP3803942 B2 JP 3803942B2 JP 22249897 A JP22249897 A JP 22249897A JP 22249897 A JP22249897 A JP 22249897A JP 3803942 B2 JP3803942 B2 JP 3803942B2
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Description
【０００１】
【発明の属する技術分野】
本発明は、例えば無溶剤塗料、床用コーティング材、屋上用防水剤などの非水系コーティング材に有効な消泡剤に関するものである。
【０００２】
【従来の技術】
非水系コーティング材として、例えば無溶剤塗料、床用コーティング材、屋上用防水剤が知られている。無溶剤塗料は被塗装物の防食性を高めるために、床用コーティング材は歩行時に床から受ける衝撃を和らげるため、あるいは屋上用防水剤は屋上の防水性を高めるため、それぞれ５００μmから２mmという比較的大きな厚みを持った膜厚で塗装されるので気泡が滞留しやすい。かかる非水系コーティング材には、二液型ウレタン樹脂または二液型エポキシ樹脂を主体とする樹脂が用いられている。これらの樹脂は気泡が巻き込まれると抜けきれず、泡跡となって残り塗装表面の外観が悪くなる。樹脂が硬化する途中、増粘した後に気泡が抜けるとビンホールを生じ、塗装による防食性、防水性を低下させる。
【０００３】
そのため、これらの非水系コーティング材には、従来よりジメチルポリシロキサン等のシリコーン系消泡剤や、変性ブタジエンポリマーよりなる消泡剤が使用されていた。またビニル系重合物を成分とする消泡剤としては、例えば特開昭６１−１４１７７２号公報にはアクリル／ビニルエーテル共重合物よりなる消泡剤、特開平５−２４７１６１号公報にはオレフィンオリゴマーよりなる消泡剤、特開平２−２３２２７１号公報にはビニルエーテル重合体よりなる消泡剤が開示されている。
【０００４】
しかしながら上記した消泡剤は、必ずしも十分な性能をを満たしていなかった。例えばシリコーン系消泡剤では脱泡速度が遅く、混入した無溶剤コーティング材の粘度上昇が起こってから泡が表面に浮き上がるため、破泡性が不十分である。また消泡効果を高めるため、消泡剤の添加量を多くすると、無溶剤コーティング材自身がはじきを生じたり、リコート性を悪くしたりする。無溶剤コーティング材が床用である場合には、スリップ効果が出て歩行する場所への塗装はできない。アクリル／ビニルエーテル共重合物系消泡剤は、無溶剤コーティング材への使用では、一般に粘度が高いため十分な効果が得られない。変性ブタジエン系ポリマーやオレフィンオリゴマーの消泡剤はかなりの効果が得られているが、無溶剤コーティング材に配合される炭酸カルシウムや硫酸バリウムなどのフィラーの種類或いは配合量によって系の粘度が非常に高くなると効果が十分ではない。ビニルエーテル重合体の消泡剤は使用されるコーティング材との相溶性をあげるように造られているため、無溶剤系では必ずしも十分な消泡効果が得られていない。
【０００５】
【発明が解決しようとする課題】
本発明は上記従来の問題点を解決するものであり、その目的とするところは、非水系コーティング材に適した消泡性能の高い消泡剤であって、混入したコーティング材の形成皮膜の外観が良好であり、塗膜性能に悪影響を与えない消泡剤を提供することにある。
【０００６】
【課題を解決するための手段】
前記の目的を達成するためになされた本発明を適用する無溶剤コーティング材用消泡剤は、分子量が２０００〜１０００００であって、アルキル基の炭素数が１０〜１６のアルキルビニルエーテルのみの重合物からなることを特徴とする。
【０００７】
そのアルキルビニルエーテル重合物は、具体的にはデシルビニルエーテル、ドデシルビニルエーテル、ミリスチルビニルエーテル、セチルビニルエーテルから選ばれる少なくとも１種類のアルキルビニルエーテルを重合した重合物である。
前記無溶剤コーティング材がポリウレタン系塗材またはエポキシ系塗材である。
【０００８】
アルキルビニルエーテル重合物の数平均分子量が２０００〜１０００００から外れると消泡効果の面から好ましくない。また使用すべき非水系コーティング材との相溶性の面からもこの程度の分子量が好ましい。さらに好ましいアルキルビニルエーテル共重合物の数平均分子量は３０００〜４００００の範囲である。
【０００９】
アルキルビニルエーテル重合物のアルキル基の炭素数が１０未満であると非水系コーティング材に対する消泡効果が不十分となる。同じく炭素数が１６より大きいとポリアルキルビニルエーテルの流動点が低いため、これを混入した非水系コーティング材を０〜５℃位の低温で塗装すると消泡効果が低下したり、コーティング材から析出したりする。
【００１０】
【発明の実施の形態】
本発明の非水系コーティング材用消泡剤の主成分であるアルキルビニルエーテ重合物は、アルキルビニルエーテル単量体、例えばデシルビニルエーテル、ドデシルビニルエーテル、ミリスチルビニルエーテル、セチルビニルエーテルの中から一種類または複数種を選び、公知の重合法、例えばカチオン重合により得られる。原料の単量体が複数種の場合には共重合物となる。アルキルビニルエーテルの共重合は、溶液重合法が一般的であり、アルキルビニルエーテル単量体を適当な不活性溶剤に溶解し、重合開始剤の存在下、−４０〜６０度℃、好ましくは−１０〜３０℃の反応温度で、約１〜１５時間、好ましくは約２〜５時間重合反応を続ける。
【００１１】
使用できる溶剤としては、原料となるビニルエーテル単量体を溶解するとともに生成するビニルエーテル共重合物も溶解し、かつ重合後、減圧濃縮等で容易に除去できるものを使用する。具体的にはトルエン、キシレン、ソルベッソ１００、等の芳香族溶剤、ミネラルスピリッツ、ヘキサン、イソパラフィン等の脂肪族溶剤、ポリαオレフィン等のオリゴマーなどがある。
【００１２】
重合開始剤（触媒）としては、例えば硫酸、リン酸、過塩素酸のようなプロトン酸や、三フッ化ホウ素、トリメチルボラン、塩化アルミニウム、四塩化チタンなどのLeweis酸と、水、アルコール、エーテル化合物のように孤立電子対を持つ共触媒が使用できる。
【００１３】
以下、本発明の実施例をさらに詳しく説明するが、本発明はこれに限定されるものではない。
【００１４】
実施例１
環流冷却器、温度計、攪拌機、および滴下槽を備えた重合用反応装置にヘキサン５０重量部および三フッ化エーテルホウ素錯塩０．０５重量部を入れ、窒素雰囲気下で、
デシルビニルエーテル ７０重量部
ドデシルビニルエーテル ３０重量部
からなる単量体の混合物溶液を１０℃において約３時間かけて滴下した。滴下終了後３０分間、同温度で保持した後、２５％アンモニア水０．１重量部とイオン交換水３０重量部を加え、３０分間攪拌した。攪拌を止め４時間静置した後、下層の水槽を分離した。さらに水３０重量部を加え洗浄、分離した後５０℃減圧下で残留水分およびヘキサンを留去した。この共重合物を非水系コーティング材用消泡剤とした。
【００１５】
尚、得られた共重合物はゲルパーミュエイションクロマトグラフィー（ＧＰＣ）分析装置（昭和電工株式会社製Shodex GPC system）で分子量分布を分析した結果、数平均分子量が１１０００であった。
【００１６】
実施例２
単量体の混合物溶液を以下のとおりとした以外は、実施例１と同一の条件で共重合物を得た。この共重合物を非水系コーティング材用消泡剤とした。
【００１７】
ドデシルビニルエーテル ３０重量部
ミリスチルビニルエーテル ５５重量部
セチルビニルエーテル １５重量部
尚、得られた共重合物の数平均分子量は９０００であった。
【００１８】
実施例３
三フッ化エーテルホウ素錯塩を０．０２５重量部とした以外は、実施例１と同一の条件で、数平均分子量２００００の共重合物を得た。この共重合物を非水系コーティング材用消泡剤とした。
【００１９】
比較例１
単量体をステリアルビニルエーテル１００重量部とした以外は、実施例３と同一の条件で数平均分子量１３０００の共重合物を得た。この共重合物を非水系コーティング材用消泡剤とした。
【００２０】
比較例２
市販のイソブチルビニルエーテルポリマー（ドイツBASF社製ルトナールI-30、数平均分子量５３００）を非水系コーティング材用消泡剤とした。
【００２１】
比較例３
破泡性ポリマーとポリシロキサンとを組合わせた市販の消泡剤ＢＹＫ−Ａ５３０（BYK Chemie 社製）を使用した。
【００２２】
比較例４
市販の変性シリコーン系消泡剤ペインタッド−５６（DOW CORNING社製）を使用した。
【００２３】
上記各実施例および各比較例の消泡剤の性能試験を以下のとおり行った。
【００２４】
性能試験１
ポリウレタン塗床材についての性能試験をした。ポリウレタン塗床材は、主剤であるウレタンプレポリマーとしてポリフレックスＦＬ−８３(ＮＣＯ％＝５．０％、第一工業製薬株式会社製)を準備した。硬化剤としてキュアミンＭＬ−５３０（Ｏ−クロロアニリン縮合物のポリエチレングリコール溶液、イハラケミカル株式会社製）を３５０重量部、ジオクチルフタレートを１６０重量部、ホワイトンＳＯ（炭酸カルシウム、白石工業株式会社製）を４８０重量部、タルクＮＤ（日本タルク株式会社製）を２０重量部、クロムオキサイドＧ５（日本化学工業株式会社製）を２０重量部の合計１０３０重量部を準備した。
【００２５】
実施例１の消泡剤、実施例２の消泡剤、実施例３の消泡剤、比較例１の消泡剤、比較例２の消泡剤、比較例３の消泡剤、比較例４の消泡剤に対応して７個の２Ｌのブリキ缶に上記配合の硬化剤を各々入れ、そこに各消泡剤を２．６重量部ずつ加えた後、高速ディスパーにて２０００ｒｐｍで５分間混合した。
【００２６】
ポリウレタン塗床材の主剤１００重量部と、前記により消泡剤を混合した硬化剤１００重量部とを５００ｍＬのポリカップに秤り取りスパチュラにて３分間混合した。同様に主剤１００重量部と、消泡剤を混合しない硬化剤１００重量部とを混合した（無添加）。これらを２．５ｋｇ／ｍ2となるように枠付きストレート板に流し込み、均一になるようにスパチュラで塗布し、２５℃にて２４時間放置して硬化させた。
【００２７】
硬化したポリウレタン塗床材の表面の残泡、および切断面の残泡を目視で観察した。また表面の光沢を村上色彩株式会社製デジタル光沢計ＧＭ−３Ｄで測定した。性能試験の結果は表１に示してある。
【００２８】
【表１】
性能試験２
エポキシ塗床材についての性能試験をした。エポキシ塗床材は、主剤としてエポキシ樹脂（エピコート８２８、ビスフェノールＡタイプ液状エポキシ樹脂、油化シェルエポキシ株式会社製）を２００重量部、反応性希釈剤（エピクロン５２０、エポキシ当量２２０−２５０、大日本インキ化学株式会社製）を５０重量部、タルクＮＤを４９．６重量部、クロムオキサイドＧ５を１０重量部、コロイダルシリカ（アエロジル２００、フュームドシリカ増粘剤、日本アエロジル株式会社製）を０．４重量部の合計３１０．０重量部を準備した。硬化剤として変性ポリアミン（エポメートＢ−００２、複素環式変性アミン系、油化シェルエポキシ株式会社製）を６０重量部と変性ポリアミン（エポメートＲＸ−３、複素環式変性アミン系、速硬化性、油化シェルエポキシ株式会社製）を６０重量部の合計１２０重量部を準備した。
【００３０】
各実施例および各比較例の消泡剤に対応して７個の１Ｌのブリキ缶に上記配合のエポキシ主剤を各々入れ、そこに各消泡剤を１．１重量部ずつ加えた後、高速ディスパーにて２０００ｒｐｍで５分間混合した。一方、上記配合の硬化剤を５００ｍＬのブリキ缶に仕込み高速ディスパーにて１５００ｒｐｍで５分間混合した。
【００３１】
上記より消泡剤を混合したエポキシ主剤１５５重量部と、混合済みの硬化剤６０重量部とを５００ｍＬのポリカップに秤り取りスパチュラにて３分間混合した。同様に主剤１５５重量部と、消泡剤を混合しない硬化剤６０重量部とを混合した（無添加）。これらを２．５ｋｇ／ｍ2となるように枠付きストレート板に流し込み、均一になるようにスパチュラで塗布し、２５℃にて２４時間放置して硬化させた。
【００３２】
硬化したエポキシ塗床材の表面の残泡、および切断面の残泡を目視で観察した。また表面の光沢を村上色彩株式会社製デジタル光沢計ＧＭ−３Ｄで測定した。性能試験の結果は表２に示してある。
【００３３】
【表２】
表１、表２から分かるとおり、実施例１、実施例２、実施例３の消泡剤は、比較例１、比較例２、比較例３、比較例４の消泡剤と比べて消泡性が優れたものであり、塗膜欠陥もなかった。加えて塗膜の光沢も優れている。塗膜の光沢が優れているのは、消泡性の改良された結果として塗膜の表面が滑らかになったためである。
【００３５】
【発明の効果】
以上、詳細に説明したように本発明を適用する非水系コーティング材用消泡剤は、これを混入したコーティング材を塗装した直後から硬化するまでの間、塗料に巻き込まれた空気や反応によって生じた気泡を素早く脱泡し、塗膜表面にて破泡させることにより、泡跡が残ることを防ぐものである。本発明の消泡剤を混入したコーティング材を塗装した面はレベリング性、光沢が優れており、塗膜の外観向上に役立つものである。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an antifoaming agent effective for non-aqueous coating materials such as solvent-free paints, floor coating materials, and roofing waterproofing agents.
[0002]
[Prior art]
As non-aqueous coating materials, for example, solvent-free paints, floor coating materials, and roofing waterproofing agents are known. Solvent-free paints increase the anticorrosion property of the object to be painted, floor coating materials reduce the impact received from the floor during walking, or rooftop waterproofing agents increase the waterproofness of the roof. Bubbles are likely to stay because it is painted with a large thickness. As such a non-aqueous coating material, a resin mainly composed of a two-component urethane resin or a two-component epoxy resin is used. When bubbles are involved, these resins cannot be removed and remain as foam marks, resulting in poor appearance of the painted surface. During the curing of the resin, if bubbles are removed after thickening, a bottle hole is formed, which reduces the anticorrosion and waterproofing properties by coating.
[0003]
For this reason, silicone-based antifoaming agents such as dimethylpolysiloxane and antifoaming agents made of modified butadiene polymers have been conventionally used for these non-aqueous coating materials. Examples of the antifoaming agent containing a vinyl polymer as a component include an antifoaming agent comprising an acrylic / vinyl ether copolymer in JP-A-61-141772, and an olefin oligomer in JP-A-5-247161. An antifoaming agent made of vinyl ether polymer is disclosed in JP-A-2-232271.
[0004]
However, the antifoaming agent described above does not always satisfy sufficient performance. For example, with a silicone-based antifoaming agent, the defoaming speed is slow, and the foam rises on the surface after the viscosity increase of the mixed solventless coating material occurs. Further, if the amount of the antifoaming agent added is increased in order to enhance the antifoaming effect, the solventless coating material itself may repel or deteriorate the recoatability. If the solvent-free coating material is for flooring, it cannot be applied to a place where it walks due to the slip effect. Acrylic / vinyl ether copolymer antifoaming agents generally do not provide sufficient effects when used in solventless coating materials because of their generally high viscosity. Modified butadiene polymer and olefin oligomer antifoaming agent have been quite effective, but the viscosity of the system is very high depending on the type or amount of filler such as calcium carbonate and barium sulfate mixed in solventless coating material. If it is high, the effect is not sufficient. Since the vinyl ether polymer antifoaming agent is made so as to increase the compatibility with the coating material to be used, the solventless system does not always provide a sufficient antifoaming effect.
[0005]
[Problems to be solved by the invention]
The present invention solves the above-mentioned conventional problems, and the object thereof is an antifoaming agent having high antifoaming performance suitable for a non-aqueous coating material, and the appearance of the coating film formed by the mixed coating material Is to provide an antifoaming agent that does not adversely affect the performance of the coating film.
[0006]
[Means for Solving the Problems]
The antifoaming agent for solventless coating material to which the present invention is applied to achieve the above-mentioned object is a polymer comprising only an alkyl vinyl ether having a molecular weight of 2,000 to 100,000 and an alkyl group having 10 to 16 carbon atoms. characterized in that it consists of.
[0007]
The alkyl vinyl ether polymer is specifically a decyl vinyl ether, dodecyl vinyl ether, myristyl ether, heavy compounds obtained by polymerizing at least one kind of alkyl vinyl ether selected from cetyl vinyl ether.
The solventless coating material is a polyurethane coating material or an epoxy coating material.
[0008]
If the number average molecular weight of the alkyl vinyl ether polymer deviates from 2000 to 100,000, it is not preferable from the viewpoint of the defoaming effect. Also, this level of molecular weight is preferable from the viewpoint of compatibility with the non-aqueous coating material to be used. The number average molecular weight of the more preferable alkyl vinyl ether copolymer is in the range of 3000 to 40000.
[0009]
If the alkyl group of the alkyl vinyl ether polymer has less than 10 carbon atoms, the defoaming effect on the non-aqueous coating material will be insufficient. Similarly, if the number of carbon atoms is greater than 16, the pour point of polyalkyl vinyl ether is low, so applying a non-aqueous coating material mixed with it at a low temperature of about 0 to 5 ° C reduces the defoaming effect or precipitates from the coating material. Or
[0010]
DETAILED DESCRIPTION OF THE INVENTION
The alkyl vinyl ether polymer that is the main component of the antifoaming agent for non-aqueous coating materials of the present invention is an alkyl vinyl ether monomer such as decyl vinyl ether, dodecyl vinyl ether, myristyl vinyl ether, or cetyl vinyl ether. It is selected and obtained by a known polymerization method such as cationic polymerization. When the raw material monomer is plural kinds, it becomes a copolymer. The copolymerization of the alkyl vinyl ether is generally a solution polymerization method, in which the alkyl vinyl ether monomer is dissolved in a suitable inert solvent, and is −40 to 60 ° C. in the presence of a polymerization initiator, preferably −10 to The polymerization reaction is continued at a reaction temperature of 30 ° C. for about 1 to 15 hours, preferably about 2 to 5 hours.
[0011]
As the solvent that can be used, a solvent that dissolves the vinyl ether monomer as a raw material and also dissolves the vinyl ether copolymer produced, and can be easily removed by vacuum concentration after polymerization is used. Specific examples include aromatic solvents such as toluene, xylene, and Solvesso 100, aliphatic solvents such as mineral spirits, hexane, and isoparaffin, and oligomers such as poly-α-olefins.
[0012]
Examples of polymerization initiators (catalysts) include protonic acids such as sulfuric acid, phosphoric acid, and perchloric acid, and Leweis acids such as boron trifluoride, trimethylborane, aluminum chloride, and titanium tetrachloride, water, alcohol, and ether. A cocatalyst having a lone electron pair such as a compound can be used.
[0013]
Examples of the present invention will be described in more detail below, but the present invention is not limited thereto.
[0014]
Example 1
A polymerization reactor equipped with a reflux condenser, a thermometer, a stirrer, and a dropping tank was charged with 50 parts by weight of hexane and 0.05 parts by weight of an ether boron trifluoride complex salt, and under a nitrogen atmosphere,
A monomer mixture solution consisting of 70 parts by weight of decyl vinyl ether and 30 parts by weight of dodecyl vinyl ether was added dropwise at 10 ° C. over about 3 hours. After maintaining at the same temperature for 30 minutes after completion of dropping, 0.1 part by weight of 25% ammonia water and 30 parts by weight of ion-exchanged water were added and stirred for 30 minutes. Stirring was stopped and the mixture was allowed to stand for 4 hours, and then the lower water tank was separated. Further, 30 parts by weight of water was added for washing and separation, and then residual water and hexane were distilled off under reduced pressure at 50 ° C. This copolymer was used as an antifoaming agent for non-aqueous coating materials.
[0015]
In addition, as a result of analyzing molecular weight distribution by the gel permeation chromatography (GPC) analyzer (Showa Denko Co., Ltd. Shodex GPC system), the obtained copolymer was 11000 in number average molecular weight.
[0016]
Example 2
A copolymer was obtained under the same conditions as in Example 1 except that the monomer mixture solution was as follows. This copolymer was used as an antifoaming agent for non-aqueous coating materials.
[0017]
Dodecyl vinyl ether 30 parts by weight Myristyl vinyl ether 55 parts by weight Cetyl vinyl ether 15 parts by weight The number average molecular weight of the obtained copolymer was 9000.
[0018]
Example 3
A copolymer having a number average molecular weight of 20000 was obtained under the same conditions as in Example 1 except that 0.025 parts by weight of the boron trifluoride complex salt was used. This copolymer was used as an antifoaming agent for non-aqueous coating materials.
[0019]
Comparative Example 1
A copolymer having a number average molecular weight of 13,000 was obtained under the same conditions as in Example 3 except that the monomer was changed to 100 parts by weight of steral vinyl ether. This copolymer was used as an antifoaming agent for non-aqueous coating materials.
[0020]
Comparative Example 2
A commercially available isobutyl vinyl ether polymer (Lutneral I-30 manufactured by BASF Germany, number average molecular weight 5300) was used as an antifoaming agent for non-aqueous coating materials.
[0021]
Comparative Example 3
A commercially available antifoaming agent BYK-A530 (by BYK Chemie) combining a foam-breaking polymer and polysiloxane was used.
[0022]
Comparative Example 4
A commercially available modified silicone antifoaming agent Paintad-56 (manufactured by DOW CORNING) was used.
[0023]
The performance test of the antifoaming agent in each of the above Examples and Comparative Examples was performed as follows.
[0024]
Performance test 1
A performance test was conducted on the polyurethane coating material. As the polyurethane coating material, Polyflex FL-83 (NCO% = 5.0%, manufactured by Daiichi Kogyo Seiyaku Co., Ltd.) was prepared as a urethane prepolymer as a main agent. As a curing agent, Cuamine ML-530 (polyethylene glycol solution of O-chloroaniline condensate, manufactured by Ihara Chemical Co., Ltd.), 350 parts by weight, dioctyl phthalate, 160 parts by weight, Whiteon SO (calcium carbonate, manufactured by Shiraishi Kogyo Co., Ltd.) Of 480 parts by weight, 20 parts by weight of talc ND (manufactured by Nippon Talc Co., Ltd.), and 20 parts by weight of chromium oxide G5 (manufactured by Nippon Chemical Industry Co., Ltd.) were prepared.
[0025]
Antifoaming agent of Example 1, Antifoaming agent of Example 2, Antifoaming agent of Example 3, Antifoaming agent of Comparative Example 1, Antifoaming agent of Comparative Example 2, Antifoaming agent of Comparative Example 3, Comparative Example Corresponding to 4 defoamers, the above-mentioned curing agents were put in 7 2 L tin cans, and 2.6 parts by weight of each antifoam was added thereto, and then 5 rpm at 2000 rpm with a high speed disper. Mixed for minutes.
[0026]
100 parts by weight of the main agent of the polyurethane coating material and 100 parts by weight of the curing agent mixed with the defoaming agent as described above were weighed into a 500 mL polycup and mixed with a spatula for 3 minutes. Similarly, 100 parts by weight of the main agent and 100 parts by weight of a curing agent not mixed with an antifoaming agent were mixed (no addition). These were poured into a straight plate with a frame so as to be 2.5 kg / m 2 , coated with a spatula so as to be uniform, and allowed to cure at 25 ° C. for 24 hours.
[0027]
The residual foam on the surface of the cured polyurethane coating material and the residual foam on the cut surface were visually observed. The surface gloss was measured with a digital gloss meter GM-3D manufactured by Murakami Color Co., Ltd. The results of the performance test are shown in Table 1.
[0028]
[Table 1]
Performance test 2
A performance test was conducted on the epoxy coating material. Epoxy coating material is 200 parts by weight of epoxy resin (Epicoat 828, bisphenol A type liquid epoxy resin, manufactured by Yuka Shell Epoxy Co., Ltd.) as a main agent, reactive diluent (Epicron 520, epoxy equivalent 220-250, Dainippon Ink Chemical Co., Ltd.) 50 parts by weight, talc ND 49.6 parts by weight, chromium oxide G5 10 parts by weight, colloidal silica (Aerosil 200, fumed silica thickener, Nippon Aerosil Co., Ltd.) A total of 310.0 parts by weight of 4 parts by weight was prepared. 60 parts by weight of modified polyamine (Epomate B-002, heterocyclic modified amine system, manufactured by Yuka Shell Epoxy Co., Ltd.) as a curing agent and modified polyamine (Epomate RX-3, heterocyclic modified amine system, fast curing, A total of 120 parts by weight of 60 parts by weight of Yuka Shell Epoxy Co., Ltd.) was prepared.
[0030]
Corresponding to the antifoaming agent of each example and each comparative example, each epoxy main ingredient of the above composition was put into 7 1L tin cans, and 1.1 parts by weight of each antifoaming agent was added thereto, followed by high speed. The mixture was mixed with a disper at 2000 rpm for 5 minutes. On the other hand, the curing agent having the above composition was charged into a 500 mL tin can and mixed with a high-speed disper at 1500 rpm for 5 minutes.
[0031]
From the above, 155 parts by weight of the epoxy main agent mixed with the antifoaming agent and 60 parts by weight of the mixed curing agent were weighed into a 500 mL polycup and mixed with a spatula for 3 minutes. Similarly, 155 parts by weight of the main agent and 60 parts by weight of a curing agent not mixed with an antifoaming agent were mixed (no addition). These were poured into a straight plate with a frame so as to be 2.5 kg / m 2 , coated with a spatula so as to be uniform, and allowed to cure at 25 ° C. for 24 hours.
[0032]
The residual foam on the surface of the cured epoxy coating and the residual foam on the cut surface were visually observed. The surface gloss was measured with a digital gloss meter GM-3D manufactured by Murakami Color Co., Ltd. The results of the performance test are shown in Table 2.
[0033]
[Table 2]
As can be seen from Tables 1 and 2, the antifoaming agents of Example 1, Example 2, and Example 3 were defoamed compared to the antifoaming agents of Comparative Example 1, Comparative Example 2, Comparative Example 3, and Comparative Example 4. The properties were excellent and there were no coating film defects. In addition, the gloss of the coating is also excellent. The gloss of the coating film is excellent because the surface of the coating film becomes smooth as a result of the improved defoaming properties.
[0035]
【The invention's effect】
As described above in detail, the antifoaming agent for non-aqueous coating materials to which the present invention is applied is generated by the air or reaction involved in the paint from immediately after coating the coating material mixed with it until it is cured. The air bubbles are quickly defoamed and broken on the surface of the coating film to prevent foam marks from remaining. The surface coated with the coating material mixed with the antifoaming agent of the present invention has excellent leveling properties and gloss, and is useful for improving the appearance of the coating film.
Claims (3)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22249897A JP3803942B2 (en) | 1997-08-19 | 1997-08-19 | Defoamer for non-aqueous coating materials |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22249897A JP3803942B2 (en) | 1997-08-19 | 1997-08-19 | Defoamer for non-aqueous coating materials |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH1161011A JPH1161011A (en) | 1999-03-05 |
| JP3803942B2 true JP3803942B2 (en) | 2006-08-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22249897A Expired - Lifetime JP3803942B2 (en) | 1997-08-19 | 1997-08-19 | Defoamer for non-aqueous coating materials |
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| Country | Link |
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| JP (1) | JP3803942B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4678456B2 (en) * | 2000-06-28 | 2011-04-27 | Ｄｉｃ株式会社 | Epoxy resin composition |
| JP4526584B2 (en) * | 2008-09-24 | 2010-08-18 | 楠本化成株式会社 | Defoamer for water-based paint |
| JP7139572B2 (en) * | 2015-12-25 | 2022-09-21 | 東レ株式会社 | Epoxy resin compositions, fiber reinforced composites, moldings and pressure vessels |
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1997
- 1997-08-19 JP JP22249897A patent/JP3803942B2/en not_active Expired - Lifetime
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| Publication number | Publication date |
|---|---|
| JPH1161011A (en) | 1999-03-05 |
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