JPH0543823A - Electrically conductive coating material - Google Patents
Electrically conductive coating materialInfo
- Publication number
- JPH0543823A JPH0543823A JP22837491A JP22837491A JPH0543823A JP H0543823 A JPH0543823 A JP H0543823A JP 22837491 A JP22837491 A JP 22837491A JP 22837491 A JP22837491 A JP 22837491A JP H0543823 A JPH0543823 A JP H0543823A
- Authority
- JP
- Japan
- Prior art keywords
- conductivity
- coating material
- weight
- imparting agent
- conductive
- 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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- Conductive Materials (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、電気化学反応に利用さ
れる電極を、電解質による酸化又は腐蝕から保護する上
で有用な導電性コーティング材に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a conductive coating material useful for protecting an electrode used in an electrochemical reaction from oxidation or corrosion by an electrolyte.
【０００２】[0002]
【従来の技術と発明が解決しようとする課題】クロムメ
ッキ浴、金属回収用電解槽、鉛蓄電池などにおいて、電
気化学反応を利用した電極が使用されている。また、地
下に埋設されるパイプラインに陽極を接続し、前記パイ
プラインを陰極とすることにより保護している。このよ
うな電極は、酸や腐蝕条件下に晒されるので、電極に
は、非腐蝕性の高い材料、例えば、ステンレス鋼、チタ
ン、耐蝕性の高い特殊な材料が使用されている。2. Description of the Related Art Electrodes utilizing an electrochemical reaction are used in a chromium plating bath, a metal recovery electrolytic bath, a lead storage battery and the like. Further, an anode is connected to a pipeline buried underground, and the pipeline is used as a cathode for protection. Since such electrodes are exposed to acid and corrosive conditions, highly non-corrosive materials such as stainless steel, titanium, and special materials having high corrosion resistance are used for the electrodes.
【０００３】一方、より安価で、小型で軽量な電極とし
て、導電性および保護能力の高い被膜を形成した電極が
検討されている。例えば、代表的な電極の１つである鉛
蓄電池の電極は、通常、酸化鉛又はスポンジ状鉛で、鉛
合金の孔空き金属板（極板）を被覆することにより構成
されている。より具体的には、前記極板は、例えば、鉛
合金の格子に、硫酸を用いて練合した酸化鉛のペースト
を塗布することにより形成されている。この極板を備え
た鉛蓄電池は、自動車、トラック、ゴルフカート、フォ
ークリフト車などの工業用車輌、電気自動車などの広い
範囲で使用されている。On the other hand, as a cheaper, smaller and lighter electrode, an electrode formed with a coating having a high conductivity and a high protective ability has been studied. For example, an electrode of a lead-acid battery, which is one of typical electrodes, is usually formed by coating a perforated metal plate (electrode plate) of lead alloy with lead oxide or sponge-like lead. More specifically, the electrode plate is formed, for example, by applying a lead oxide paste kneaded with sulfuric acid to a lead alloy grid. Lead acid batteries provided with this electrode plate are used in a wide range of automobiles, trucks, golf carts, industrial vehicles such as forklift trucks, electric vehicles and the like.
【０００４】しかし、この蓄電池の電極は硫酸水溶液か
らなる電解液に浸漬して使用されるので、鉛合金極板が
腐蝕する。極板が腐蝕すると、腐蝕物が蓄電池のケース
の底に沈降し蓄積されるだけでなく、他の電極の寿命を
短くなり、ひいては蓄電池の破損が生じる。However, since the electrode of this storage battery is used by immersing it in an electrolytic solution containing a sulfuric acid aqueous solution, the lead alloy electrode plate is corroded. When the electrode plate is corroded, not only the corroded material settles and accumulates on the bottom of the storage battery case, but also the life of other electrodes is shortened, and the storage battery is damaged.
【０００５】特開昭６１−１６５９５８号公報には、腐
蝕を防止するため、フッ素系樹脂、ポリシロキサン系樹
脂、エポキシ樹脂などの樹脂１００重量部に対して、導
電性充填材５０〜３００重量部を含む導電性塗料で、電
極を被覆することが提案されている。In Japanese Patent Laid-Open No. 61-165958, in order to prevent corrosion, 50 to 300 parts by weight of a conductive filler is added to 100 parts by weight of a resin such as a fluorine resin, a polysiloxane resin and an epoxy resin. It has been proposed to coat the electrodes with a conductive paint containing
【０００６】しかし、この導電性塗料は、電極に対する
接着力が小さい。また、塗膜の可撓性が小さいためか、
電極表面に導電性塗料により薄膜を形成した後、組立工
程に供すると、塗膜にクラックが発生し易い。さらに、
前記導電性塗料で形成した塗膜の導電性が未だ小さいの
で、高い導電性を付与するためには、多量の導電性カー
ボンブラックを添加する必要がある。しかし、導電性カ
ーボンブラックを樹脂溶液に添加すると、塗布液の粘度
が大幅に上昇し、吹き付け、ディッピングなどの方法に
よる均一な塗布が困難である。従って、作業性が低下す
るだけでなく、多量のカーボンブラックの添加により被
膜強度が低下すると共に、前記クラックなどがさらに発
生し易くなる。However, this conductive paint has a small adhesive force to the electrodes. Also, because the flexibility of the coating film is small,
When a thin film is formed on the electrode surface with a conductive paint and then subjected to an assembly process, cracks are likely to occur in the coating film. further,
Since the electroconductivity of the coating film formed of the electroconductive paint is still small, it is necessary to add a large amount of electroconductive carbon black in order to impart high electroconductivity. However, when the conductive carbon black is added to the resin solution, the viscosity of the coating solution is significantly increased, and it is difficult to uniformly coat the coating solution by a method such as spraying or dipping. Therefore, not only the workability is lowered, but also the film strength is lowered by the addition of a large amount of carbon black, and the cracks are more likely to occur.
【０００７】従って、本発明の目的は、電極などの基材
に対する密着性、可撓性および導電性に優れると共に、
欠陥の少ない被膜を形成でき、基材を長期に亘り保護で
きる導電性コーティング材を提供することにある。Accordingly, the object of the present invention is to provide excellent adhesion, flexibility and conductivity to a substrate such as an electrode, and
An object of the present invention is to provide a conductive coating material capable of forming a coating film with few defects and protecting a substrate for a long period of time.
【０００８】[0008]
【発明の構成】本発明は、被膜形成能を有するバインダ
ーと、粒子状導電性付与剤および繊維状導電性付与剤か
らなる導電性付与剤とを含むコーティング材であって、
前記バインダー１００重量部に対して、導電性付与剤２
５〜５０重量部を含み、乾燥塗膜の体積電気抵抗値が１
００Ω・ｃｍ以下である導電性コーティング材を提供す
る。The present invention is a coating material containing a binder having a film-forming ability and a conductivity-imparting agent comprising a particulate conductivity-imparting agent and a fibrous conductivity-imparting agent,
Conductivity-imparting agent 2 based on 100 parts by weight of the binder
Including 5 to 50 parts by weight, the volume electric resistance value of the dry coating film is 1
Provided is a conductive coating material having a resistance of 00 Ω · cm or less.
【０００９】被膜形成能を有するバインダーは、可撓性
を有し、基材との密着性、塗膜の機械的強度を損わない
限り、いずれの樹脂も使用でき。このようなバインダー
としては、例えば、ポリエステル、アクリル系樹脂、ス
チレン系樹脂、フッ素樹脂、エポキシ樹脂、フェノール
樹脂、フラン樹脂、ビニルエステル樹脂などが例示され
る。これらのバインダーは少なくとも一種使用される。As the binder capable of forming a film, any resin can be used as long as it has flexibility and does not impair the adhesion to the substrate and the mechanical strength of the coating film. Examples of such a binder include polyester, acrylic resin, styrene resin, fluororesin, epoxy resin, phenol resin, furan resin, vinyl ester resin and the like. At least one of these binders is used.
【００１０】これらのバインダーの中で、飽和ポリエス
テル、フッ素樹脂、エポキシ樹脂、ビニルエステル樹
脂、フェノール樹脂、フラン樹脂からなる群から選択さ
れた樹脂が好ましい。前記フッ素樹脂には、塗料用とし
て使用される樹脂、例えば、ヘキサメチレンジイソシア
ネート、トリレンジイソシアネートなどのポリイソシア
ネートや、ヘキサメトキシメチルメラミンなどの架橋剤
により架橋可能なフルオロオレフィン重合体などが含ま
れる。ビニルエステル樹脂には、ビスフェノール型や水
添ビスフェノール型などのエポキシ樹脂と、アクリル酸
またはメタクリル酸との反応により得られる樹脂が含ま
れる。Among these binders, a resin selected from the group consisting of saturated polyester, fluororesin, epoxy resin, vinyl ester resin, phenol resin and furan resin is preferable. The fluororesin includes resins used for paints, for example, polyisocyanates such as hexamethylene diisocyanate and tolylene diisocyanate, and fluoroolefin polymers crosslinkable with a crosslinking agent such as hexamethoxymethylmelamine. The vinyl ester resin includes a resin obtained by reacting a bisphenol-type or hydrogenated bisphenol-type epoxy resin with acrylic acid or methacrylic acid.
【００１１】さらに、前記バインダーの中で、飽和ポリ
エステル、特に変性飽和ポリエステルは、基材との密着
性、溶剤に対する溶解性、耐蝕性などに優れている。Further, among the binders, saturated polyester, particularly modified saturated polyester, is excellent in adhesion to a substrate, solubility in a solvent, corrosion resistance and the like.
【００１２】前記変性飽和ポリエステルは、ポリエチレ
ンテレフタレートの構成モノマーであるテレフタル酸及
びエチレングリコールの少なくとも一部を、他のジカル
ボン酸及び／又は多価アルコールで置換したポリエステ
ルである。テレフタル酸と置換可能なジカルボン酸とし
ては、例えば、フタル酸、無水フタル酸、およびイソフ
タル酸が挙げられる。エチレングリコールと置換可能な
多価アルコールとしては、例えば、ジエチレングリコー
ル、トリエチレングリコール、およびネオペンチルグリ
コールなどのジオールが挙げられる。前記ジカルボン酸
及び／又は多価アルコールは、テレフタル酸及び／又は
エチレングリコールの少なくとも一部を置換すればよ
い。The modified saturated polyester is a polyester obtained by substituting at least a part of terephthalic acid and ethylene glycol, which are constituent monomers of polyethylene terephthalate, with another dicarboxylic acid and / or a polyhydric alcohol. Examples of the dicarboxylic acid that can replace terephthalic acid include phthalic acid, phthalic anhydride, and isophthalic acid. Examples of the polyhydric alcohol that can be substituted with ethylene glycol include diols such as diethylene glycol, triethylene glycol, and neopentyl glycol. The dicarboxylic acid and / or the polyhydric alcohol may substitute at least a part of terephthalic acid and / or ethylene glycol.
【００１３】テレフタル酸の割合は、例えば、ジカルボ
ン酸全体の１０〜８０モル％、好ましくは３０〜７０モ
ル％、さらに好ましくは５０〜６０モル％程度である。
エチレングリコールの割合は、例えば、ジオール全体の
５〜８０モル％、好ましくは１０〜５０モル％程度であ
る。The proportion of terephthalic acid is, for example, 10 to 80 mol%, preferably 30 to 70 mol%, and more preferably 50 to 60 mol% of the total dicarboxylic acid.
The proportion of ethylene glycol is, for example, about 5 to 80 mol%, preferably about 10 to 50 mol% of the whole diol.
【００１４】好ましい変性飽和ポリエステルは、フタル
酸、イソフタル酸、及びテレフタル酸と、エチレングリ
コール、ジエチレングリコール、トリエチレングリコー
ル、及びネオペンチルグリコールとの反応により得られ
る非結晶性の飽和ポリエステルである。Preferred modified saturated polyesters are amorphous saturated polyesters obtained by reacting phthalic acid, isophthalic acid, and terephthalic acid with ethylene glycol, diethylene glycol, triethylene glycol, and neopentyl glycol.
【００１５】このような変性飽和ポリエステルは、有機
溶媒に対する溶解性が高いので、スプレー、ディッピン
グによる塗装が可能であり、基材を容易に被覆できると
共に、基材に対する接着力が向上する。特にエチレング
リコール、ジエチレングリコールおよびトリエチレング
リコールを組合せることにより、接着力が向上する。さ
らに、変性飽和ポリエステルは耐蝕性に優れる。特に、
イソフタル酸とテレフタル酸とを使用することにより、
耐蝕性が向上する。しかも、前記変性飽和ポリエステル
は、フッ素系樹脂やポリシロキサン系樹脂などと比較し
て安価である。Since such a modified saturated polyester has a high solubility in an organic solvent, it can be applied by spraying or dipping, the base material can be easily coated, and the adhesive strength to the base material is improved. In particular, the combination of ethylene glycol, diethylene glycol and triethylene glycol improves the adhesive strength. Furthermore, the modified saturated polyester has excellent corrosion resistance. In particular,
By using isophthalic acid and terephthalic acid,
Corrosion resistance is improved. Moreover, the modified saturated polyester is inexpensive as compared with the fluororesin and the polysiloxane resin.
【００１６】前記変性飽和ポリエステルの分子量は、有
機溶剤に対する溶解性、耐蝕性などを損わない範囲であ
ればよく、例えば、重量平均分子量１×１０4 〜５×１
０5 、好ましくは２×１０4 〜１×１０5 程度である。The modified saturated polyester may have a molecular weight within a range that does not impair solubility in an organic solvent, corrosion resistance and the like. For example, a weight average molecular weight of 1 × 10 4 to 5 × 1.
It is about 0 5 , preferably about 2 × 10 4 to 1 × 10 5 .
【００１７】本発明では、粒子状導電性付与剤および繊
維状導電性付与剤からなる導電性付与剤が使用される。
導電性付与剤としては、慣用の材料、例えば、導電性カ
ーボンブラック、金属粉、金属繊維、炭素繊維などが例
示される。導電性カーボンブラックは、アセチレンブラ
ック、コンダクティブファーネスブラックなどであって
もよいが、導電性の高い多孔中空状のカーボンブラック
［例えば、アクゾ社製、ケッチェンブラックＥＣなど］
が好ましい。炭素繊維の種類は特に限定されず、ポリア
クリロニトリル系、レーヨン系、フェノール樹脂系、ピ
ッチ系炭素繊維などのいずれも使用できる。炭素繊維
は、炭素繊維化可能な繊維を不活性雰囲気又は真空中、
１５００℃未満の温度で焼成した炭化系炭素繊維であっ
てもよく、１５００℃以上の温度で焼成した黒鉛化系炭
素繊維であってもよい。炭素繊維としては、電気電導度
の高い炭素繊維、例えば、体積固有抵抗が１０-2Ω・ｃ
ｍ以下の炭素繊維が好ましい。なお、熱処理温度の高い
黒鉛化系炭素繊維は電気電導度を高める上で有用であ
る。In the present invention, a conductivity-imparting agent composed of a particulate conductivity-imparting agent and a fibrous conductivity-imparting agent is used.
Examples of the conductivity imparting agent include conventional materials such as conductive carbon black, metal powder, metal fibers and carbon fibers. The conductive carbon black may be acetylene black, conductive furnace black, or the like, but it is a highly conductive porous carbon black [eg, Akzo Co., Ketjen Black EC, etc.].
Is preferred. The type of carbon fiber is not particularly limited, and any of polyacrylonitrile-based, rayon-based, phenol resin-based, pitch-based carbon fiber and the like can be used. Carbon fiber is a fiber that can be made into carbon fiber in an inert atmosphere or vacuum,
It may be a carbonized carbon fiber fired at a temperature of less than 1500 ° C or a graphitized carbon fiber fired at a temperature of 1500 ° C or more. The carbon fiber has a high electric conductivity, for example, a volume resistivity of 10 -2 Ω · c.
Carbon fibers of m or less are preferred. The graphitized carbon fiber having a high heat treatment temperature is useful for increasing the electric conductivity.
【００１８】炭素繊維の繊維径は、塗膜の均一性、作業
性を損わない限り特に制限されないが、通常４〜２０μ
ｍ、好ましくは７〜１３μｍ程度である。炭素繊維の繊
維長は、電気電導度、作業性を低下させない範囲、例え
ば、体積平均繊維長３０〜４５０μｍ、好ましくは７０
〜１５０μｍ程度である。The fiber diameter of the carbon fiber is not particularly limited as long as it does not impair the uniformity and workability of the coating film, but it is usually 4 to 20 μm.
m, preferably about 7 to 13 μm. The fiber length of the carbon fibers is in a range that does not reduce the electric conductivity and workability, for example, the volume average fiber length is 30 to 450 μm, preferably 70.
It is about 150 μm.
【００１９】これらの導電性付与剤の中で、硫酸水溶液
などの腐蝕性の高い環境下で使用する場合には、金属材
料を除く材料が好ましい。これらの導電性付与剤におい
て、粒子状の導電性付与剤と繊維状の導電性付与剤、特
に導電性カーボンブラックと炭素繊維とを併用するのが
好ましい。導電性カーボンブラックと炭素繊維とを組合
せて使用すると、炭素繊維又は導電性カーボンブラック
単独の場合に比べて、少量の導電性付与剤で高い電気電
導度が得られると共に、塗膜の機械的強度が大きくな
る。このことは、塗膜中で炭素繊維が導電性カーボンブ
ラック間を連結するためと思われる。Of these conductivity-imparting agents, materials other than metal materials are preferable when used in a highly corrosive environment such as an aqueous solution of sulfuric acid. In these conductivity-imparting agents, it is preferable to use a particle-like conductivity-imparting agent and a fibrous conductivity-imparting agent, in particular, conductive carbon black and carbon fiber in combination. When used in combination with conductive carbon black and carbon fiber, compared to the case of using carbon fiber or conductive carbon black alone, high electrical conductivity can be obtained with a small amount of conductivity-imparting agent and the mechanical strength of the coating film can be obtained. Will grow. This is probably because the carbon fibers in the coating film connect the conductive carbon blacks.
【００２０】なお、一般に、導電性付与剤をコーティン
グ材に添加すると、粘度が著しく増大すると共に塗膜が
不均一となり易いため、その添加量は可能な限り少ない
方が好ましい。しかし、導電性カーボンブラック単独又
は炭素繊維単独で十分な導電性を付与するには、多量の
添加が必要である。この場合、コーティング材の粘度が
高過ぎて、塗装操作が困難となり、塗膜の機械的強度お
よび均一性が低下する。特に、炭素繊維よりも導電性カ
ーボンブラックを添加する方が、コーティング材の粘度
上昇に及ぼす影響が大きい。例えば、乾燥塗膜の電気抵
抗を約１０Ω・ｃｍとするためには、バインダー１００
重量部及び溶剤３００重量部からなる組成物に対して、
カーボンブラックを約３０重量部を添加する必要があ
る。この場合、コーティング材の粘度は５０００センチ
ポイズ以上となり、通常の方法では塗装できなくなる。
同様に、炭素繊維の単独の場合には、前記組成物に炭素
繊維約６０重量部を添加する必要があり、この場合に
も、通常の方法ではコーティング剤を塗装できなくな
る。Generally, when the conductivity-imparting agent is added to the coating material, the viscosity remarkably increases and the coating film tends to become non-uniform. Therefore, the addition amount is preferably as small as possible. However, in order to impart sufficient conductivity with the conductive carbon black alone or the carbon fiber alone, it is necessary to add a large amount. In this case, the viscosity of the coating material is too high, which makes the coating operation difficult and reduces the mechanical strength and uniformity of the coating film. In particular, the addition of conductive carbon black has a greater effect on the viscosity increase of the coating material than the addition of carbon fiber. For example, in order to make the electric resistance of the dried coating film about 10 Ω · cm, the binder 100
To a composition consisting of 1 part by weight and 300 parts by weight of solvent,
It is necessary to add about 30 parts by weight of carbon black. In this case, the coating material has a viscosity of 5000 centipoise or more, and cannot be coated by a usual method.
Similarly, in the case of carbon fiber alone, it is necessary to add about 60 parts by weight of carbon fiber to the composition, and even in this case, the coating agent cannot be applied by the usual method.
【００２１】これに対して、導電性カーボンブラックと
炭素繊維とを併用する場合、前記と同様の組成物に対し
て、例えば、導電性カーボンブラックおよび炭素繊維を
それぞれ約２０重量部添加すると、ディッピングによる
塗装が可能となり、乾燥塗膜の電気抵抗が著しく小さな
コーティング材を得ることができる。On the other hand, when the conductive carbon black and the carbon fiber are used in combination, for example, when about 20 parts by weight of the conductive carbon black and the carbon fiber are added to the same composition as described above, the dipping is performed. Thus, it is possible to obtain a coating material having a remarkably low electric resistance of the dry coating film.
【００２２】本発明のコーティング材による乾燥塗膜の
体積電気抵抗値は１００Ω・ｃｍ以下、好ましくは７５
Ω・ｃｍ以下である。このような電気抵抗値に調整する
ために必要な導電性付与剤の添加量は、通常、前記バイ
ンダー１００重量部に対して、２５〜５０重量部、好ま
しくは３０〜４０重量部程度である。粒子状導電性付与
剤と繊維状導電性付与剤との割合は、塗膜の導電性およ
び強度を損わない範囲、例えば、粒子状導電性付与剤／
繊維状導電性付与剤＝２０〜７５／２５〜８０（重量
比）、好ましくは２５〜６０／３０〜７５（重量比）程
度である。特に、前記バインダー１００重量部に対し
て、炭素繊維と導電性カーボンブラックとの合計添加量
が３０〜４０重量部程度であって、炭素繊維／導電性カ
ーボンブラック＝１０〜３０／１０〜２０（重量部）程
度のコーティング材は、塗膜の導電性、機械的強度、均
一性に優れている。The volumetric electric resistance of the dry coating film formed by the coating material of the present invention is 100 Ω · cm or less, preferably 75.
Ω · cm or less. The amount of the conductivity-imparting agent required to adjust to such an electric resistance value is usually 25 to 50 parts by weight, preferably 30 to 40 parts by weight, based on 100 parts by weight of the binder. The ratio of the particulate conductivity-imparting agent to the fibrous conductivity-imparting agent is in a range that does not impair the conductivity and strength of the coating film, for example, the particulate conductivity-imparting agent /
Fibrous conductivity imparting agent = 20 to 75/25 to 80 (weight ratio), preferably about 25 to 60/30 to 75 (weight ratio). In particular, the total addition amount of carbon fiber and conductive carbon black is about 30 to 40 parts by weight, and carbon fiber / conductive carbon black = 10 to 30/10 to 20 (based on 100 parts by weight of the binder). The coating material of about (part by weight) has excellent conductivity, mechanical strength and uniformity of the coating film.
【００２３】本発明の導電性コーティング材は、通常、
液状として使用される。液状コーティング材の溶媒とし
ては、例えば、アルコール類、脂肪族炭化水素類、脂環
族炭化水素類、芳香族炭化水素類、エステル類、ケトン
類、エーテル類などの種々の有機溶媒が使用できる。コ
ーティング材の粘度は、溶媒の添加量により塗装方法に
応じて選択できるが、ディッピングによる塗装では、約
３００センチポイズである。好ましい溶媒の添加量は、
バインダー１００重量部に対して約８０〜約４００重量
部程度である。溶媒の添加量が約８０重量部未満では、
コーティング材の粘度が高くなり、約４００重量部を越
えると、塗膜の均一性および機械的強度が低下し易い。The conductive coating material of the present invention is usually
Used as a liquid. As the solvent of the liquid coating material, various organic solvents such as alcohols, aliphatic hydrocarbons, alicyclic hydrocarbons, aromatic hydrocarbons, esters, ketones and ethers can be used. The viscosity of the coating material can be selected according to the coating method depending on the amount of the solvent added, but the coating by dipping is about 300 centipoise. The preferred amount of solvent added is
It is about 80 to about 400 parts by weight with respect to 100 parts by weight of the binder. If the amount of solvent added is less than about 80 parts by weight,
When the viscosity of the coating material becomes high and exceeds about 400 parts by weight, the uniformity and mechanical strength of the coating film are likely to decrease.
【００２４】また、コーティング材は、必要に応じて、
可塑剤、分散剤、レベリング剤、粘度調整剤などの添加
剤を含んでいてもよい。The coating material, if necessary,
It may contain additives such as a plasticizer, a dispersant, a leveling agent, and a viscosity modifier.
【００２５】コーティング材の塗布方法は、例えば、ス
プレーコーティング法、ディッピング法、ローラコーテ
ィング法などの種々の塗布方法が採用できる。As the coating method of the coating material, various coating methods such as a spray coating method, a dipping method and a roller coating method can be adopted.
【００２６】本発明の導電性コーティング材は、基材と
の密着性が高いので、前記コーティング材をプライマー
として使用し、上塗りコーティング材によりさらに被膜
を形成してもよい。この場合、上塗りコーティング材と
基材との密着性が損われないので、種々のコーティング
材、例えば、機械的強度、化学的耐蝕性の高い上塗りコ
ーティング材が使用できる。このような上塗りコーティ
ング材用樹脂としては、前記フッ素樹脂、エポキシ樹
脂、フェノール樹脂、フラン樹脂の他に、スチレンなど
のビニルモノマーとビニルエステル樹脂とを含む不飽和
ポリエステルなどが挙げられる。Since the conductive coating material of the present invention has high adhesion to the substrate, the above coating material may be used as a primer and a coating film may be further formed by a top coating material. In this case, since the adhesion between the topcoat coating material and the substrate is not impaired, various coating materials, for example, a topcoat coating material having high mechanical strength and chemical corrosion resistance can be used. Examples of the resin for the topcoat coating material include unsaturated polyesters containing a vinyl monomer such as styrene and a vinyl ester resin in addition to the fluororesin, the epoxy resin, the phenol resin, and the furan resin.
【００２７】さらに、本発明のコーティング材は導電性
の高い塗膜を形成できるので、金属、プラスチック、セ
ラミックス、木材など、広い範囲の基材に塗布できる。
特に、本発明のコーティング材は、塗膜の耐蝕性が高く
欠陥が少ないので、腐蝕性環境下で使用される電極用コ
ーティング材として好適である。Further, since the coating material of the present invention can form a coating film having high conductivity, it can be applied to a wide range of base materials such as metal, plastic, ceramics and wood.
In particular, the coating material of the present invention is suitable as an electrode coating material used in a corrosive environment because the coating film has high corrosion resistance and few defects.
【００２８】[0028]
【発明の効果】本発明の導電性コーティング材は、電極
などの基材に対する密着性、可撓性及び塗膜の導電性に
優れ、欠陥の少ない被膜により基材を長期に亘り保護で
きる。また、導電性コーティング材は塗布性にも優れて
いる。EFFECTS OF THE INVENTION The conductive coating material of the present invention is excellent in adhesion to a substrate such as an electrode, flexibility, and conductivity of a coating film, and can protect the substrate for a long period of time with a film having few defects. In addition, the conductive coating material has excellent coating properties.
【００２９】[0029]
【実施例】以下に、実施例に基づいて本発明をより詳細
に説明する。EXAMPLES The present invention will be described in more detail based on the following examples.
【００３０】実施例１〜３ イソフタル酸１モル、テレフタル酸１モル、ネオペンチ
ルグリコール１．３４モル、エチレングリコール０．２
２モル、ジエチレングリコール０．２２モル、およびト
リエチレングリコール０．２２モルを反応させ、変性飽
和ポリエステル樹脂（分子量４．７×１０4 ）を得た。
この変性飽和ポリエステル樹脂、炭素繊維（繊維径１３
μｍ、体積平均繊維長１３０μｍ）、導電性カーボンブ
ラック（アクゾ社製、ケッチンブラック）、および溶剤
を表に示す割合（重量部）で混合して分散し、コーティ
ング材を調製した。Examples 1-3 Isophthalic acid 1 mol, terephthalic acid 1 mol, neopentyl glycol 1.34 mol, ethylene glycol 0.2
2 mol, 0.22 mol of diethylene glycol, and 0.22 mol of triethylene glycol were reacted to obtain a modified saturated polyester resin (molecular weight 4.7 × 10 4 ).
This modified saturated polyester resin, carbon fiber (fiber diameter 13
μm, volume average fiber length 130 μm), conductive carbon black (Kechtin black manufactured by Akzo Co., Ltd.), and solvent were mixed and dispersed at a ratio (parts by weight) shown in the table to prepare a coating material.
【００３１】得られたコーティング材を、ポリプロピレ
ン製樹脂板に塗布し、塗装性を評価すると共に、６０℃
の温度で１時間乾燥し、電気抵抗測定機（三菱油化社
製、ロレスターＭＣＰ−Ｔ４００）を用いて体積電気抵
抗を測定した。The obtained coating material was applied to a polypropylene resin plate to evaluate the coatability, and at 60 ° C.
It was dried at the temperature of 1 hour and the volume electric resistance was measured using an electric resistance measuring device (Mitsubishi Oil Chemical Co., Ltd., Lorester MCP-T400).
【００３２】比較例１および２ 実施例で用いた変性飽和ポリエステルと、導電性カーボ
ンブラック、および溶剤を表に示す割合（重量部）で混
合して分散し、コーティング材を調製する以外、実施例
と同様にして、塗装性を評価すると共に、電気抵抗を測
定した。Comparative Examples 1 and 2 The modified saturated polyester used in the examples, the conductive carbon black, and the solvent were mixed and dispersed in the proportions (parts by weight) shown in the table to prepare a coating material. In the same manner as above, the paintability was evaluated and the electric resistance was measured.
【００３３】比較例３および４ 実施例で用いた変性飽和ポリエステルと、ミルド炭素繊
維（繊維径７μｍ、体積平均繊維長７０μｍ）および溶
剤を表に示す割合（重量部）で混合して分散し、コーテ
ィング材を調製する以外、実施例と同様にして、塗装性
を評価すると共に、電気抵抗を測定した。Comparative Examples 3 and 4 The modified saturated polyester used in the examples, milled carbon fibers (fiber diameter 7 μm, volume average fiber length 70 μm) and solvent were mixed and dispersed in the ratios (parts by weight) shown in the table, The coatability was evaluated and the electrical resistance was measured in the same manner as in the example except that the coating material was prepared.
【００３４】実施例１〜３および比較例１〜４で得られ
たコーティング材の組成、塗装性および乾燥塗膜の体積
固有抵抗を表に示す。なお、塗装性は下記の基準に従っ
て評価した。The compositions of the coating materials obtained in Examples 1 to 3 and Comparative Examples 1 to 4, the coatability, and the volume resistivity of the dried coating film are shown in the table. The coatability was evaluated according to the following criteria.
【００３５】優 ：均一な塗膜を形成できる 不可：塗膜が不均一となり、塗装性が悪いExcellent: A uniform coating film can be formed. Poor: The coating film becomes non-uniform and the coatability is poor.
【００３６】[0036]
【表１】 実施例４ 実施例１で得られたコーティング材を鉛合金板にディッ
ピングにより塗布し、常温で約１時間自然乾燥させ、膜
厚９０μｍの塗膜を形成した。次いで、塗膜で被覆した
鉛合金板を３５％硫酸に浸漬し、２ボルトの電位を印加
し、４週間放置したところ、塗膜には全く異状が認めら
れなかった。[Table 1] Example 4 The coating material obtained in Example 1 was applied to a lead alloy plate by dipping, and naturally dried at room temperature for about 1 hour to form a coating film having a film thickness of 90 μm. Next, when the lead alloy plate coated with the coating film was dipped in 35% sulfuric acid and a potential of 2 V was applied and left standing for 4 weeks, no abnormalities were observed in the coating film.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 村上 靖人 大阪府吹田市泉町４−８−３ (72)発明者 稲守 均之 大阪市中央区平野町四丁目１番２号 大阪 瓦斯株式会社内 (72)発明者 東山 勝 大阪市中央区平野町四丁目１番２号 大阪 瓦斯株式会社内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yasuto Murakami 4-8-3 Izumimachi, Suita City, Osaka Prefecture (72) Inventor Noriyuki Inamori 4-1-2, Hiranocho, Chuo-ku, Osaka Osaka Gas Co., Ltd. (72) Inventor Masaru Higashiyama 4-1-2 Hirano-cho, Chuo-ku, Osaka City Osaka Gas Co., Ltd.
Claims (3)
状導電性付与剤および繊維状導電性付与剤からなる導電
性付与剤とを含むコーティング材であって、前記バイン
ダー１００重量部に対して、導電性付与剤２５〜５０重
量部を含み、乾燥塗膜の体積電気抵抗値が１００Ω・ｃ
ｍ以下である導電性コーティング材。1. A coating material comprising a binder capable of forming a film and a conductivity-imparting agent comprising a particulate conductivity-imparting agent and a fibrous conductivity-imparting agent, wherein 100 parts by weight of the binder is used. It contains 25 to 50 parts by weight of a conductivity-imparting agent, and the dry coating film has a volume electric resistance value of 100 Ω · c.
A conductive coating material of m or less.
ある請求項１記載の導電性コーティング材。2. The conductive coating material according to claim 1, wherein the binder is a modified saturated polyester.
体積平均繊維長３０〜４５０μｍの炭素繊維／導電性カ
ーボンブラック＝２５〜８０／２０〜７５（重量比）で
構成されている請求項１記載の導電性コーティング材。3. The conductivity-imparting agent has a fiber diameter of 4 to 20 μm,
The conductive coating material according to claim 1, which is composed of carbon fibers having a volume average fiber length of 30 to 450 μm / conductive carbon black = 25 to 80/20 to 75 (weight ratio).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22837491A JPH0543823A (en) | 1991-08-12 | 1991-08-12 | Electrically conductive coating material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22837491A JPH0543823A (en) | 1991-08-12 | 1991-08-12 | Electrically conductive coating material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0543823A true JPH0543823A (en) | 1993-02-23 |
Family
ID=16875466
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22837491A Pending JPH0543823A (en) | 1991-08-12 | 1991-08-12 | Electrically conductive coating material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0543823A (en) |
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