JP4883957B2 - Composition for backing film and anticorrosion mirror using the same - Google Patents

Composition for backing film and anticorrosion mirror using the same Download PDF

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JP4883957B2
JP4883957B2 JP2005228339A JP2005228339A JP4883957B2 JP 4883957 B2 JP4883957 B2 JP 4883957B2 JP 2005228339 A JP2005228339 A JP 2005228339A JP 2005228339 A JP2005228339 A JP 2005228339A JP 4883957 B2 JP4883957 B2 JP 4883957B2
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coating film
pigment
film
composition
mirror
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JP2007045849A (en
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元行 酒徳
昌次 福田
小田  修
光芳 矢野
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Central Glass Co Ltd
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本発明は、ガラス板に金属膜を形成し、該金属膜上に無鉛の裏止め塗膜が形成されてなる鏡を作製するための裏止め塗膜用組成物およびそれを用いた防食鏡に関する。   The present invention relates to a composition for a back coating film for producing a mirror in which a metal film is formed on a glass plate and a lead-free back coating film is formed on the metal film, and an anticorrosion mirror using the same. .

鏡は、ガラス板の少なくとも片面に金属膜を形成し、該金属膜上に金属膜の防食のための裏止め塗膜を被覆して形成される。   The mirror is formed by forming a metal film on at least one surface of a glass plate, and coating the metal film with a back coating film for preventing corrosion of the metal film.

通常、鏡は、ガラス板の上に、銀鏡膜および銀鏡膜保護のための銅膜等の金属膜、これら金属膜の腐食、変質を防止めするための、言い換えれば、防食のための裏止め塗膜が順次、被覆形成されて構成される。   Usually, a mirror is placed on a glass plate with a silver mirror film and a metal film such as a copper film for protecting the silver mirror film, and a backing for preventing corrosion or alteration of the metal film, in other words, for preventing corrosion. The coating is formed by sequentially forming a coating.

従来、前記裏止め塗膜用組成物には、合成樹脂バインダーに鉛系顔料を分散させたものが用いられ、例えば、アミノアルキド樹脂、エポキシ樹脂、ウレタン樹脂またはフェノ−ルアルキド樹脂に、例えば、光明丹、鉛シアナミド、塩基性硫酸鉛、塩基性炭酸鉛、鉛酸カルシウム等の鉛系顔料を分散させたものが用いられてきた。   Conventionally, the composition for a backing coating film is obtained by dispersing a lead pigment in a synthetic resin binder. For example, an aminoalkyd resin, an epoxy resin, a urethane resin, or a phenol alkyd resin, Dispersed lead pigments such as red, lead cyanamide, basic lead sulfate, basic lead carbonate, calcium leadate have been used.

鉛系顔料は、裏止め塗膜に含有させることで、そのカチオン効果、還元効果、中和効果、アニオン効果によって、裏止め塗膜に含有させた際、鏡に縁シケ、中シケが発生することを防止する働きがある。   Lead pigments are included in the back coating film, and when they are contained in the back coating film due to their cation effect, reduction effect, neutralization effect, and anion effect, edge and medium dermis are generated in the mirror. It works to prevent this.

カチオン効果とは、通常鏡に使われる銀、銅等の金属よりイオン化傾向の大きい鉛金属塩により、銀、銅等のイオン化、変質を抑制する効果である。また、還元効果とは、金属膜との界面を還元雰囲気にすることにより、金属膜の酸化を防止する効果である。また、中和効果とは、鉛系顔料から生じる塩基性物質で腐食部の酸度を中和し、金属膜の酸化を防止する効果である。また、アニオン効果とは鉛系顔料から溶出した陰イオン、例えばシアナミドと、金属膜における金属イオンが反応して不動態被膜を形成し、金属膜の腐食を防止する効果である。   The cation effect is an effect of suppressing ionization and alteration of silver, copper and the like by a lead metal salt having a higher ionization tendency than metals such as silver and copper usually used in mirrors. The reduction effect is an effect of preventing oxidation of the metal film by setting the interface with the metal film in a reducing atmosphere. The neutralizing effect is an effect of neutralizing the acidity of the corroded portion with a basic substance generated from a lead-based pigment and preventing oxidation of the metal film. The anion effect is an effect of preventing the corrosion of the metal film by reacting an anion eluted from the lead-based pigment, such as cyanamide, with the metal ion in the metal film to form a passive film.

縁シケとは、鏡の縁部に発生する腐食、変質であり、中シケとは、鏡の内部に発生するスポット状の腐食、変質である。   The edge scab is corrosion and alteration that occurs at the edge of the mirror, and the middle sille is spot-like corrosion and alteration that occurs inside the mirror.

しかしながら、近年、鉛化合物は地球環境問題より6価クロム化合物、カドミニウム化合物、水銀等とともに環境負荷物質として、世界的に削減方向にあり、裏止め塗膜に鉛系顔料を含まない無鉛鏡であって、防食性能に優れた防食鏡のニーズが高まっている。   However, in recent years, lead compounds have been reduced worldwide as environmentally hazardous substances together with hexavalent chromium compounds, cadmium compounds, mercury, etc. due to global environmental problems, and they are lead-free mirrors that do not contain lead-based pigments in the back coating film. The need for anti-corrosion mirrors with excellent anti-corrosion performance is increasing.

更に、同様の理由で、銀鏡膜の防食保護のための金属保護膜である銅膜等がない鏡、言い換えれば、ガラス板の少なくとも片面に、銀鏡膜を形成し、直接、銀鏡膜に無鉛の裏止め塗膜を形成してなる無鉛無銅の防食鏡のニーズが高まり、防食性能に優れた裏止め塗膜を与える裏止め塗膜用組成物の開発が待たれている。   Furthermore, for the same reason, a mirror without a copper film or the like, which is a metal protective film for anticorrosion protection of the silver mirror film, in other words, a silver mirror film is formed on at least one side of the glass plate, and the silver mirror film is directly lead-free. The need for a lead-free and copper-free anticorrosion mirror formed with a back coating film has increased, and the development of a composition for a back coating film that provides a back coating film with excellent anticorrosion performance has been awaited.

例えば、鉛系顔料の含有が殆どなく、実質的に無鉛の裏止め塗膜を用いながら、鏡膜の腐食および変質を防止し長期間を安定した鏡品質を維持する防食鏡が特許文献1にて開示されている。該防食鏡において、裏止め塗膜は、重量百分率で表して、エポキシ樹脂および硬化剤40〜85%、ケトンホルムアルデヒド樹脂およびその誘導体15〜60%よりなるバインダーと、組成中7〜55%の防錆顔料を含む顔料とが、重量比で、顔料/バインダー=1.2〜4.0からなる塗料を塗布硬化したものであり、防錆顔料に無鉛顔料を用いる。   For example, Patent Document 1 discloses an anticorrosion mirror that contains almost no lead-based pigment and uses a substantially lead-free backing coating to prevent corrosion and deterioration of the mirror film and maintain stable mirror quality over a long period of time. Are disclosed. In the anticorrosive mirror, the back coating film is expressed in weight percentage, and includes a binder comprising 40 to 85% of an epoxy resin and a curing agent, 15 to 60% of a ketone formaldehyde resin and a derivative thereof, and 7 to 55% of an anticorrosive in the composition. A pigment containing a rust pigment is obtained by coating and curing a paint consisting of pigment / binder = 1.2 to 4.0 by weight, and a lead-free pigment is used as the rust preventive pigment.

防食鏡は、鉛系顔料を用いた裏止め塗膜が用いられてきた。鉛系顔料は優れた防錆剤である。しかしながら、環境負荷の問題で無鉛顔料のみを用いたとしても、有鉛顔料を用いた場合と同等の防食性能を有する裏止め塗膜用組成物の開発が待たれている。
特開平07−013006号公報
For anticorrosion mirrors, a backing coating using a lead-based pigment has been used. Lead-based pigments are excellent rust inhibitors. However, even if only lead-free pigments are used due to environmental load problems, development of a composition for a back coating film having anticorrosion performance equivalent to that when leaded pigments are used is awaited.
JP 07-013006 A

防食鏡の裏止め塗膜用組成物には防錆効果に優れる鉛系顔料が用いられてきたが、鉛は環境負荷物質として使用しない方向に推移している。しかしながら、鉛系顔料は、そのカチオン効果、還元効果、中和効果、アニオン効果によって、裏止め塗膜に含有させた際、鏡に縁シケ、中シケの発生を防止する働きがあり、鉛系顔料を他の防錆顔料、例えばモリブデン化合物に単に換えるだけでは、その効果は得られない。   Lead-based pigments that are excellent in rust-preventing effects have been used in compositions for backing films for anti-corrosion mirrors, but lead has not been used as an environmentally hazardous substance. However, lead-based pigments have the effect of preventing the occurrence of edge and medium dermis in the mirror when incorporated in the back coating film due to their cation effect, reduction effect, neutralization effect, and anion effect. Simply replacing the pigment with another anti-corrosion pigment, such as a molybdenum compound, does not provide the effect.

本発明は、鉛系顔料を用いずに、無鉛顔料のみを用いて裏止め塗膜とした際に、銀鏡膜、銅膜等の金属膜を保護し、鏡の腐食および変質を防止する無鉛の裏止め塗膜用組成物を得ることを技術的課題とし、該裏止め塗膜用組成物を用い長期間安定した鏡面品質を維持する防食鏡を提供することを目的とする。   The present invention protects a metal film such as a silver mirror film and a copper film when using only a lead-free pigment without using a lead-based pigment to prevent corrosion and deterioration of the mirror. An object of the present invention is to provide a composition for a back coating film, and an object thereof is to provide an anticorrosion mirror that maintains a stable mirror surface quality for a long period of time using the composition for a back coating film.

本発明は、鉛系顔料の替わりに無鉛防錆顔料としてモリブデン化合物を用い、裏止め塗膜にモリブデン化合物を含有させた際、その防錆効果を充分に発揮させることを目的とし、強靭且つ強固な裏止め塗膜をなす合成樹脂バインダーを得るための樹脂の種類および組成、言い換えれば、裏止め塗膜用組成物を提供するものである。   The present invention uses a molybdenum compound as a lead-free rust-preventing pigment instead of a lead-based pigment, and when the back coating film contains a molybdenum compound, the object is to fully exhibit its rust-preventing effect, and it is tough and strong. Kinds and compositions of resins for obtaining a synthetic resin binder for forming a back coating film, in other words, a composition for a back coating film is provided.

更に、本発明は、前記事項に加え、裏止め塗膜中のモリブデン化合物の含有率を検討し、更にモリブデン化合物とともに用いることで更なる鏡の防食性能を向上させる効果を奏する化合物として水酸化ビスマス、トリポリリン酸アルミニウムおよびカルシウム交換シリカを無鉛防錆顔料として用い、裏止め塗膜用組成物を最適設計したことで、鉛系顔料を用いた場合と同等の優れた防食鏡を提供するものである。   In addition to the above matters, the present invention further examines the content of the molybdenum compound in the backing coating film, and further uses it together with the molybdenum compound as a compound that has the effect of further improving the anticorrosion performance of the mirror. By using aluminum tripolyphosphate and calcium exchanged silica as lead-free anti-corrosion pigments and optimally designing the composition for the back coating film, it provides an excellent anti-corrosion mirror equivalent to the case of using lead-based pigments. .

モリブデン酸カルシウム、リンモリブデン酸アルミニウムから選ばれるモリブデン系化合物は、裏止め塗膜用組成物を分散させた裏止め塗膜用塗料中で金属錯体を作り、金属保護膜がない場合は、該錯体が銀鏡膜表面に作用して、金属保護膜がある場合は、例えば金属保護膜としての銅表面に作用して不動態を作ることで優れた防食効果を発生すると考えられる。   Molybdenum compounds selected from calcium molybdate and aluminum phosphomolybdate form a metal complex in the coating material for the back coating film in which the composition for the back coating film is dispersed. When it acts on the silver mirror film surface and there is a metal protective film, it is considered that an excellent anticorrosive effect is generated by, for example, acting on the copper surface as the metal protective film to create a passive state.

更に、モリブデン化合物に加えて、水酸化ビスマス、トリポリリン酸アルミニウム、カルシウム交換シリカを1種以上含めば防食効果が相乗的に得られ、より優れた防食性能を有する裏止め塗膜が得られる。   Furthermore, if one or more bismuth hydroxide, aluminum tripolyphosphate, and calcium exchange silica are included in addition to the molybdenum compound, the anticorrosion effect can be obtained synergistically, and a backing coating film having better anticorrosion performance can be obtained.

本発明において、発明者が鋭意検討した結果、(P)顔料における無鉛防錆顔料として、モリブデン酸カルシウムと水酸化ビスマスをともに用いることで、特に耐食性能に優れた防食鏡を与える裏止め塗膜用組成物が得られた。   In the present invention, as a result of intensive studies by the inventor, as a lead-free rust preventive pigment in the (P) pigment, a backing coating film that provides a corrosion-resistant mirror having particularly excellent corrosion resistance performance by using both calcium molybdate and bismuth hydroxide A composition for use was obtained.

即ち、本発明は、ガラス板に金属膜が形成され該金属膜上に無鉛の裏止め塗膜が被覆形成されてなる防食鏡を作製するための少なくとも無鉛防錆顔料を含む(P)顔料と(B)合成樹脂バインダーからなる裏止め塗膜用組成物であって、(B)合成樹脂バインダーに、(P)顔料が(P)/(B)=1.2〜4.0の重量比で分散されてなり、無鉛防錆顔料がモリブデン化合物であることを特徴とする裏止め塗膜用組成物である。
That is, the present invention includes a (P) pigment containing at least a lead-free rust-preventing pigment for producing an anticorrosion mirror in which a metal film is formed on a glass plate and a lead-free back coating film is formed on the metal film. (B) A composition for a backing coating film comprising a synthetic resin binder, wherein the weight ratio of (P) pigment is (P) / (B) = 1.2 to 4.0 in the (B) synthetic resin binder. A composition for a back coating film, wherein the lead-free rust preventive pigment is a molybdenum compound.

本発明において、前記モリブデン化合物は、モリブデン酸カルシウムおよび/またはリンモリブデン酸アルミニウムを用いる
In the present invention, the molybdenum compound, using calcium molybdate and / or aluminum phosphomolybdate.

更に、本発明は、無鉛防錆顔料にモリブデン化合物に加え、水酸化ビスマス、トリポリリン酸アルミニウムおよび/またはカルシウム交換シリカを用いてもよい
Furthermore, in the present invention, bismuth hydroxide, aluminum tripolyphosphate and / or calcium exchange silica may be used in addition to the molybdenum compound in the lead-free rust preventive pigment.

本発明において、前記(B)合成樹脂バインダーは、(A)アルキド樹脂と(E)エポキシ樹脂と(M)加熱硬化により3次元に架橋されたマトリックスを形成するための樹脂(以下、本明細書において、「架橋樹脂」という)とからなり、(A):(E):(M)=60.0〜95.0:1.0〜30.0:1.0〜30.0の重量比である。
In the present invention, the (B) synthetic resin binder comprises (A) an alkyd resin, (E) an epoxy resin, and (M) a resin for forming a three-dimensionally crosslinked matrix (hereinafter referred to as the present specification). And (A) :( E) :( M) = 60.0-95.0: 1.0-30.0: 1.0-30.0 weight ratio It is.

本発明において、前記(M)架橋樹脂は、アミノ樹脂および/またはブロックイソシアネート樹脂である

In the present invention, the (M) crosslinked resins are amino resins and / or blocked isocyanate resins.

本発明において、(P)顔料と(B)合成樹脂バインダーを合わせた重量に対して、重量百分率で表して、モリブデン化合物が、0.1%以上、6.0%以下の範囲で含有されてなる
In the present invention, the molybdenum compound is contained in the range of 0.1% or more and 6.0% or less, expressed as a percentage by weight, based on the combined weight of the (P) pigment and the (B) synthetic resin binder. Become .

更に、本発明は、モリブデン化合物に加え、水酸化ビスマスが、重量比で表して、水酸化ビスマス/モリブデン化合物=1.0〜8.0の範囲で含有されてなることが好ましいFurthermore, in the present invention, it is preferable that bismuth hydroxide is contained in a range of bismuth hydroxide / molybdenum compound = 1.0 to 8.0 in weight ratio in addition to the molybdenum compound.

更に、本発明は、上記の裏止め塗膜用組成物を塗布後硬化させた裏止め塗膜が形成されてなる防食鏡である。   Furthermore, the present invention is an anticorrosion mirror in which a backing coating film formed by applying the above-mentioned composition for backing coating film and then curing is formed.

更に、本発明は、前記硬化が20℃以上、200℃以下に加熱して行なわれたことを特徴とする上記の防食鏡である   Furthermore, the present invention is the anticorrosion mirror described above, wherein the curing is performed by heating to 20 ° C. or more and 200 ° C. or less.

本発明により、裏止め塗膜用組成物中に、環境負荷の懸念のある鉛を用いた鉛系顔料を含有しなかったとしても、無鉛顔料であるモリブデン化合物を使用し、更に、マトリックスとしての合成樹脂バインダーに使用する樹脂の種類および組成比を鋭意検討することで、銀鏡膜、銅膜を保護し、腐食、変質を防止する裏止め塗膜を与える裏止め塗膜用組成物が得られ、長期間安定し優れた鏡面品質を維持できる防食鏡が提供された。   According to the present invention, even if the back coating film composition does not contain a lead-based pigment using lead that has a concern of environmental impact, a molybdenum compound that is a lead-free pigment is used, and further, as a matrix By studying the types and composition ratios of the resins used in the synthetic resin binder, a composition for the backing coating film that provides a backing coating film that protects the silver mirror film and copper film and prevents corrosion and alteration can be obtained. An anticorrosion mirror that is stable for a long time and can maintain excellent mirror surface quality has been provided.

本発明の裏止め塗膜用組成物は、銅膜のみならず、銀鏡膜に直接に塗布被覆したとしても優れた防食効果を鏡に与える。   The composition for a back coating film of the present invention gives an excellent anticorrosive effect to a mirror even if it is applied and coated not only on a copper film but also on a silver mirror film.

鏡は、ガラス板Gの少なくとも片面に金属膜が形成されてなる。   The mirror is formed by forming a metal film on at least one side of the glass plate G.

図1は、鏡の概略断面図である。図1に示すように、通常、鏡は、ガラス板Gに鏡膜1、銀鏡膜1を保護する銅膜等からなる金属保護膜2、即ち、金属膜としての銀鏡膜1、金属保護膜2、次いで裏止め塗膜3を順次積層形成させてなる。また、前述の金属保護膜2を設けないこともあり銀鏡膜1に直接、無鉛の裏止め塗膜3を被覆すれば、環境に優しい無鉛無銅鏡となる。   FIG. 1 is a schematic sectional view of a mirror. As shown in FIG. 1, the mirror usually has a mirror film 1 on a glass plate G, a metal protective film 2 made of a copper film for protecting the silver mirror film 1, etc., that is, a silver mirror film 1 as a metal film, a metal protective film 2 Then, the back coating film 3 is sequentially laminated. In addition, since the metal protective film 2 described above may not be provided, if the lead-free backing coating 3 is directly coated on the silver mirror film 1, an environment-friendly lead-free and copper-free mirror is obtained.

通常、鏡の製造において、鏡膜としての銀鏡膜1、銀鏡膜1を保護する金属保護膜2としての銅膜をスプレー等の膜形成手段を用いメッキ法等で順次膜付けした後、裏止め塗膜用塗料を、ローラーコート、フローコート、スプレー等の適宜手段で塗布後、硬化させて金属保護膜に被覆するように塗布して乾燥させ裏止め塗膜3を形成する。   Usually, in mirror manufacturing, a silver mirror film 1 as a mirror film and a copper film as a metal protective film 2 that protects the silver mirror film 1 are sequentially deposited by a plating method or the like using a film forming means such as a spray, and then backed. The coating film coating is applied by an appropriate means such as roller coating, flow coating, spraying, and the like, then cured and coated so as to cover the metal protective film, and dried to form the backing coating film 3.

尚、鏡膜は銀が一般的に使用されるが、アルミニウム、チタン等の鏡膜を形成する金属および銀を含むこれら金属を混在させたものも挙げられる。   In addition, although silver is generally used for a mirror film, what mixed these metals containing metal which forms mirror films, such as aluminum and titanium, and silver is also mentioned.

鏡膜を保護する金属保護膜2は銅が一般的に使用されるが、銅膜を有しない無銅鏡のニーズに対しては、化学的安定性を有し、銀鏡膜1との密着性がよく、銀鏡膜1と同様な被膜形成法、例えば、無電解メッキ法により容易に膜形成し得る金属、ニッケル、ニッケル合金、錫、錫合金等の各種金属が金属保護膜2として用いる方法、金属保護膜2そのものを廃し、銀鏡膜1に、直接、裏止め塗膜用塗料を被覆するように塗布して乾燥させ裏止め塗膜3を形成する方法がある。   The metal protective film 2 that protects the mirror film is generally made of copper. However, for the needs of a copper-free mirror that does not have a copper film, the metal protective film 2 has chemical stability and adhesion to the silver mirror film 1. Well, a method for forming a film similar to the silver mirror film 1, for example, a method in which various metals such as nickel, nickel alloy, tin, tin alloy and the like, which can be easily formed by electroless plating, are used as the metal protective film 2, metal There is a method in which the protective film 2 itself is discarded, and the back coating film 3 is formed by coating the silver mirror film 1 directly so as to cover the coating film for the back coating film and drying it.

本発明の裏止め塗膜用組成物は、組成物として(P)顔料と(B)合成樹脂バインダーを有し、(P)顔料として無鉛防錆顔料としてのモリブデン化合物、着色顔料、体質顔料を使用し、(B)バインダーとして合成樹脂バインダーを使用し、(P)顔料を(B)合成樹脂バインダーに重量比、(P)顔料/(B)合成樹脂バインダー=1.2以上、4.0以下、即ち、(P)/(B)=1.2〜4.0で分散してなる。本発明において、(P)顔料とは、無鉛防錆顔料、着色顔料、体質顔料を併せたものであるが、鏡に防錆性能を与える無鉛防錆顔料を必須とし、着色顔料は着色のための、体質顔料は裏止め塗膜の膜厚を厚くするため等の付加的顔料であり必ずしも必須ではなく、無鉛防錆顔料のみの使用もあり得る。   The composition for a back coating film of the present invention comprises (P) a pigment and (B) a synthetic resin binder as a composition, and (P) a molybdenum compound as a lead-free rust preventive pigment, a coloring pigment, and an extender pigment as the pigment. (B) a synthetic resin binder is used as a binder, (P) pigment is in a weight ratio to (B) synthetic resin binder, (P) pigment / (B) synthetic resin binder = 1.2 or more, 4.0 In the following, (P) / (B) = 1.2 to 4.0. In the present invention, the (P) pigment is a combination of a lead-free rust preventive pigment, a colored pigment, and an extender pigment. However, a lead-free rust preventive pigment that gives a mirror a rust preventive performance is essential, and the color pigment is colored. The extender pigment is an additional pigment for increasing the film thickness of the backing coating film and is not always essential, and only a lead-free rust preventive pigment may be used.

本発明の裏止め塗膜用組成物において、(P)顔料の(B)バインダー樹脂に対する重量比(P)/(B)は、1.2〜4.0の範囲とすることが好ましい。(P)/(B)が1.2未満の裏止め塗膜用組成物を用い裏止め塗膜3を成形した鏡は、耐温水性試験において、温水に長時間浸漬後、鏡膜にブリスターが発生し易い。また、(P)/(B)が4.0を超えた裏止め塗膜用組成物を用いた裏止め用塗膜を成形した鏡は、裏止め塗膜3と金属保護膜2、あるいは裏止め塗膜3と銀鏡膜1との密着性が悪化し、耐薬品性、耐湿性も低下して、縁シケ、中シケが発生し易い。更に、好ましくは、(P)/(B)が1.4〜3.0の範囲である。   In the composition for a backing coating film of the present invention, the weight ratio (P) / (B) of the (P) pigment to the (B) binder resin is preferably in the range of 1.2 to 4.0. A mirror in which the backing coating film 3 was formed using a backing coating composition having a (P) / (B) of less than 1.2 was a blister on the mirror film after being immersed in warm water for a long time in a warm water resistance test. Is likely to occur. Further, a mirror formed from a back coating film using a back coating film composition with (P) / (B) exceeding 4.0 is a back coating film 3 and a metal protective film 2 or Adhesiveness between the stop coating film 3 and the silver mirror film 1 is deteriorated, chemical resistance and moisture resistance are also lowered, and edge and medium stains are likely to occur. Further, (P) / (B) is preferably in the range of 1.4 to 3.0.

本発明の裏止め塗膜用組成物中の(P)顔料における無鉛防錆顔料としては、モリブデン酸カルシウム、リンモリブデン酸アルミニウムのモリブデン化合物から選ばれる少なくとも1種以上の金属化合物を用いる。尚、本発明の、無鉛防錆顔料は、環境汚染の懸念のあるCr、Pb、Hg、Cdも含まない。   As the lead-free rust preventive pigment in the (P) pigment in the composition for a back coating film of the present invention, at least one metal compound selected from calcium molybdate and a molybdenum compound of aluminum phosphomolybdate is used. In addition, the lead-free rust preventive pigment of the present invention does not contain Cr, Pb, Hg, or Cd that may cause environmental pollution.

モリブデン化合物は裏止め塗膜用組成物を分散させた裏止め塗膜用塗料中で金属錯体を作り、金属保護膜がない場合は、該錯体が銀鏡膜表面、金属保護膜がある場合は、例えば金属保護膜としての銅表面に作用して不動態を作ることで優れた防食効果を発生すると考えられ、水酸化ビスマス、トリポリリン酸アルミニウム、カルシウム交換シリカ、水酸化アルミニウムから選ばれる金属化合物を1種以上含めば防食効果が相乗的に得られる。特に、無鉛防錆顔料としてモリブデン酸カルシウムと水酸化ビスマスをともに用いることで、耐食性能に優れた防食鏡を与える裏止め塗膜用組成物が得られた。   Molybdenum compound makes a metal complex in the coating for the back coating film in which the composition for the back coating film is dispersed, and when there is no metal protective film, when the complex has a silver mirror film surface and a metal protective film, For example, it is considered that an excellent anticorrosive effect is generated by acting on a copper surface as a metal protective film to generate a passive state, and a metal compound selected from bismuth hydroxide, aluminum tripolyphosphate, calcium exchange silica, and aluminum hydroxide is 1 If more than seeds are included, the anticorrosive effect can be obtained synergistically. In particular, by using both calcium molybdate and bismuth hydroxide as lead-free rust preventive pigments, a composition for a backing coating film that provides a corrosion-resistant mirror with excellent corrosion resistance was obtained.

銀鏡膜1の着色を防止し、優れた防食性、耐水性および耐薬品性を得た防食鏡のために、本発明の裏止め塗膜用組成物中の(P)顔料において、無鉛防錆顔料に加え、通常は、酸化チタン、弁柄、黄色酸化鉄、鉄黒、カ−ボンブラックおよび/または有機顔料等の着色顔料、タルク、沈降性硫酸バリウム、マイカ、カオリン、炭酸カルシウム、バライト等の体質顔料を加える。   In order to prevent the coloring of the silver mirror film 1 and to obtain an anticorrosive mirror having excellent anticorrosion properties, water resistance and chemical resistance, in the (P) pigment in the composition for a back coating film of the present invention, lead-free rust prevention In addition to pigments, usually titanium oxide, petal, yellow iron oxide, iron black, carbon black and / or colored pigments such as organic pigments, talc, precipitated barium sulfate, mica, kaolin, calcium carbonate, barite, etc. Add the extender pigment.

本発明の裏止め塗膜用組成物における(B)合成樹脂バインダーは(A)アルキド樹脂、(E)エポキシ樹脂、(M)架橋樹脂よりなる。   The (B) synthetic resin binder in the composition for a back coating film of the present invention comprises (A) an alkyd resin, (E) an epoxy resin, and (M) a crosslinked resin.

本発明の裏止め塗膜用組成物において、(B)合成樹脂バインダーとして、(A)アルキド樹脂、(E)エポキシ樹脂に、(M)架橋樹脂としてアミノ樹脂、ブロックドイソシアネート樹脂を用い加熱硬化させて、強靭に3次元に架橋されたマトリックスが得られ、銀鏡膜1あるいは金属保護膜2を強く被覆しはがれ難い。   In the composition for a backing coating film of the present invention, (B) a synthetic resin binder, (A) an alkyd resin, (E) an epoxy resin, (M) an amino resin or a blocked isocyanate resin as a crosslinking resin, and heat curing. As a result, a toughly three-dimensionally crosslinked matrix is obtained, and the silver mirror film 1 or the metal protective film 2 is hard to peel off.

(B)合成樹脂バインダーに(A)アルキド樹脂のみを使用すると、裏止め塗膜とした際に硬度がなく強靭な被覆が得られない。(B)合成樹脂バインダーとして(E)エポキシ樹脂のみを使用すると、硬化のためには2液性となり、2液混合後、経時に伴い硬化するため、裏止め塗料として使用できるライフが短い、また粘性が高いため裏止め塗膜とした際に気泡ができやすい等の欠点が生じる。   (B) When only the (A) alkyd resin is used for the synthetic resin binder, there is no hardness and a tough coating cannot be obtained when a backing coating film is formed. (B) When only the epoxy resin (E) is used as the synthetic resin binder, it becomes two-component for curing, and since it cures with time after mixing the two components, the life that can be used as a back coating is short. Due to the high viscosity, there are disadvantages such as easy formation of bubbles when a backing coating film is formed.

一般的に、(A)アルキド樹脂は、原料として脂肪酸、油脂、多塩基酸、多価アルコ−ル等を用い変性させたもので、重量百分率で表して、樹脂分等の不揮発分を40重量%〜80重量%含む粘液状で、特に本発明においては、アルコ−ルと酸とのエステル化によって生成し樹脂状で無水フタル酸等の多塩基酸とグリセリン等の多価アルコ−ルとの結合物を骨格とし油脂で変性した樹脂、更に、ロジン等の天然樹脂、フェノ−ル樹脂等の合成樹脂、エポキシ樹脂およびスチレンモノマーまたはメチルメタアクリレートモノマ−等の重合性モノマーで変性した樹脂が有用であり、一般に市販されているものが1種または2種以上の組合せで使用される。   Generally, the (A) alkyd resin is modified by using fatty acids, fats and oils, polybasic acids, polyhydric alcohols and the like as raw materials, and expressed by weight percentage, and 40% by weight of non-volatile content such as resin content. In particular, in the present invention, a resinous polybasic acid such as phthalic anhydride and a polyhydric alcohol such as glycerin are produced by esterification of alcohol and acid. Resins modified with oils and fats with a conjugate as the skeleton, natural resins such as rosin, synthetic resins such as phenol resins, resins modified with polymerizable monomers such as epoxy resins and styrene monomers or methyl methacrylate monomers are useful. In general, those commercially available are used alone or in combination of two or more.

本発明の裏止め塗膜用組成物に用いる(B)合成樹脂バインダーとしての組成物の一つである(E)エポキシ樹脂は、1分子中に少なくとも2個以上のエポキシ基を有する樹脂であり、好ましくは、数平均分子量300〜4000、エポキシ当量150〜3500の樹脂、更に、好ましくはエポキシ当量180〜3000のビスフェノ−ルA型エポキシ樹脂が1種または2種以上、組合せて使用される。   The epoxy resin (E) which is one of the compositions as the (B) synthetic resin binder used in the composition for the backing coating film of the present invention is a resin having at least two epoxy groups in one molecule. Preferably, a resin having a number average molecular weight of 300 to 4000 and an epoxy equivalent of 150 to 3500, more preferably a bisphenol A type epoxy resin having an epoxy equivalent of 180 to 3000 is used alone or in combination.

本発明の裏止め塗膜用組成物に用いる(B)合成樹脂バインダーの組成物の一つである(M)架橋樹脂には、アミノ樹脂またはブロックイソシアネート樹脂が使用される。   An amino resin or a blocked isocyanate resin is used for the (M) cross-linked resin which is one of the compositions of the (B) synthetic resin binder used in the composition for a back coating film of the present invention.

本発明の裏止め塗膜用組成物に用いる合成樹脂バインダーの組成物の一つである(M)架橋樹脂としてのアミノ樹脂には、メラミン樹脂、ベンゾグアナミン樹脂、尿素樹脂、ブチル化尿素樹脂、ブチル化尿素メラミン樹脂、グリコールウリル樹脂、アセトグアナミン樹脂、およびシクロヘキシルグアナミン樹脂が挙げられるが、塗膜が硬いこと、耐薬品性に優れることからメラミン樹脂を用いるが好ましい。変性に用いたアルコールの種類によって、メチル化メラミン樹脂、n−ブチル化メラミン樹脂、イソブチル化メラミン樹脂、および混合アルキル化メラミン樹脂等に種別されており、1種または2種以上の組合せで使用される。   The amino resin (M), which is one of the synthetic resin binder compositions used in the composition for the backing coating film of the present invention, includes melamine resin, benzoguanamine resin, urea resin, butylated urea resin, butyl Urea melamine resin, glycoluril resin, acetoguanamine resin, and cyclohexylguanamine resin are mentioned, but melamine resin is preferably used because the coating film is hard and has excellent chemical resistance. Depending on the type of alcohol used for modification, it is classified into methylated melamine resin, n-butylated melamine resin, isobutylated melamine resin, mixed alkylated melamine resin, etc., and it is used in one or a combination of two or more. The

本発明の裏止め塗膜用組成物に用いる合成樹脂バインダーの組成物の一つである(M)架橋樹脂としてのブロックイソシアネート樹脂は、1分子中に2個以上のイソシアネート基を有する化合物であり、具体的にはトリレンジイソシアネート、ジフェニルメタンジイソシアネート、キシレンジイソシアネート、ナフタレンジイソシアネート等の芳香族ジイソシアネート、ヘキサメチレンジイソシアネート、ダイマー酸ジイソシアネート等の脂肪族ジイソシアネート、イソホロンジイソシアネート、シクロヘキサンジイソシアネート等の脂環族ジイソシアネート、該ポリイソシアネートのビューレットタイプの付加物、イソシアヌル環タイプ付加物等のポリイソシアネートをフェノール類、オキシム類、活性メチレン類、ε−カプロラクタム類、トリアゾール類、およびピラゾール類等のブロック剤で封鎖したブロックイソシアネート樹脂等が挙げられ、一般に市販されているものの中から1種または2種以上の組合せで使用される。また触媒としてジブチルチンジラウリレート等の有機錫触媒を併用してもよい。   The blocked isocyanate resin as the (M) crosslinked resin, which is one of the compositions of the synthetic resin binder used in the composition for the backing coating film of the present invention, is a compound having two or more isocyanate groups in one molecule. Specifically, aromatic diisocyanates such as tolylene diisocyanate, diphenylmethane diisocyanate, xylene diisocyanate and naphthalene diisocyanate, aliphatic diisocyanates such as hexamethylene diisocyanate and dimer diisocyanate, alicyclic diisocyanates such as isophorone diisocyanate and cyclohexane diisocyanate, the polyisocyanate Polyisocyanates such as burette type adducts and isocyanuric ring type adducts of isocyanates with phenols, oximes, active methylenes, and ε-caprolactams Triazoles, and pyrazoles blocked isocyanate resin or the like blocked with blocking agent and the like, are generally used in one or more combinations among those commercially available. An organic tin catalyst such as dibutyltin dilaurate may be used in combination as the catalyst.

また、本発明の裏止め塗膜用組成物には、(M)架橋樹脂として前記アミノ樹脂とブロックイソシアネート樹脂とが適宜併用される。また、前記アミノ樹脂とブロックイソシアネート樹脂の硬化反応を促進するため、金属錯塩、即ち、ドライヤーを本発明の裏止め塗膜用組成物に添加してもよい。   Moreover, the amino resin and block isocyanate resin are suitably used together as the (M) crosslinking resin in the composition for a backing coating film of the present invention. Moreover, in order to accelerate | stimulate the hardening reaction of the said amino resin and blocked isocyanate resin, you may add a metal complex salt, ie, a dryer, to the composition for backing coating films of this invention.

本発明の裏止め塗膜用組成物における(B)合成樹脂バインダーは、(A)アルキド樹脂、(E)エポキシ樹脂、(M)架橋樹脂からなり、(A)アルキド樹脂、(E)エポキシ樹脂、(M)架橋樹脂の重量比は、(A):(E):(M)=60.0〜95.0:1.0〜30:1.0〜30.0の範囲である。更に、好ましくはA:E:M=65.0〜90.0:5.0〜25.0:2.0〜25.0の範囲である。   The (B) synthetic resin binder in the composition for a back coating film of the present invention comprises (A) an alkyd resin, (E) an epoxy resin, and (M) a crosslinked resin, and (A) an alkyd resin and (E) an epoxy resin. , (M) The weight ratio of the crosslinked resin is in the range of (A) :( E) :( M) = 60.0-95.0: 1.0-30: 1.0-30.0. Further, A: E: M = 65.0 to 90.0: 5.0 to 25.0: 2.0 to 25.0.

(A)アルキド樹脂の重量比が60.0未満の裏止め塗膜用組成物により形成した裏止め塗膜3を有する鏡は耐温水性に劣り、温水に長時間浸漬すると裏止め塗膜3中にブリスターが発生し易く、(A)アルキド樹脂の重量比が95.0を超えた裏止め塗膜用組成物により形成した裏止め塗膜3を有する鏡においては、鏡の耐薬品性および耐湿性に劣り、鏡膜に縁シケまたは中シケが発生し易い。   (A) A mirror having a backing coating film 3 formed of a composition for a backing coating film having a weight ratio of alkyd resin of less than 60.0 is inferior in warm water resistance, and the backing coating film 3 is immersed in warm water for a long time. In a mirror having a backing coating film 3 formed of a composition for a backing coating film in which blisters are easily generated and (A) the weight ratio of the alkyd resin exceeds 95.0, the chemical resistance of the mirror and It is inferior in moisture resistance, and edge or medium stains are likely to occur on the mirror film.

(E)エポキシ樹脂の重量比が1.0未満の裏止め塗膜用組成物により形成した裏止め塗膜3を有する鏡は、耐薬品性等に劣り、縁シケ、中シケが発生し易く、好ましくは、5.0以上である。(E)エポキシ樹脂の重量比が30.0を超えた裏止め塗膜用組成物により形成した裏止め塗膜3を有する鏡においては、裏止め塗膜3と金属保護膜2との密着性に劣り、好ましくは、25.0以下である。   (E) A mirror having a back coating film 3 formed from a back coating film composition having an epoxy resin weight ratio of less than 1.0 is inferior in chemical resistance, etc., and easily causes edge or medium scum. Preferably, it is 5.0 or more. (E) Adhesiveness between the back coating film 3 and the metal protective film 2 in the mirror having the back coating film 3 formed from the back coating film composition having a weight ratio of epoxy resin exceeding 30.0. Is preferably 25.0 or less.

(M)架橋樹脂の重量比が1.0未満の裏止め塗膜用組成物により形成した裏止め塗膜3を有する鏡は、耐薬品性等が劣化して縁シケ、中シケが発生し易く、好ましくは、2.0以上である。(M)架橋樹脂の重量比が30.0を超えた裏止め塗膜用組成物により形成した裏止め塗膜3を有する鏡においては、耐温水性に劣り、温水に長時間浸漬すると裏止め塗膜中にブリスターが発生し易く、好ましくは25.0以下である。   (M) A mirror having a back coating film 3 formed of a composition for a back coating film having a weight ratio of the cross-linked resin of less than 1.0 causes deterioration of chemical resistance and the like, and edge scum and medium scab are generated. It is easy and preferably is 2.0 or more. (M) A mirror having a back coating film 3 formed of a composition for a back coating film in which the weight ratio of the crosslinked resin exceeds 30.0 is inferior in resistance to warm water and backs up when immersed in warm water for a long time. Blisters are easily generated in the coating film, preferably 25.0 or less.

本発明の裏止め塗膜用組成物には、裏止め塗膜組成物に一般的に使用される防錆剤、レベリング剤、消泡剤、シランカップリング剤、沈殿防止剤が必要に応じて添加される。   In the composition for a backing coating film of the present invention, a rust preventive agent, a leveling agent, an antifoaming agent, a silane coupling agent, and a suspending agent that are generally used in a backing coating film composition are necessary. Added.

本発明の裏止め塗膜用組成物の製造において、サンドミル、ボールミル、アトライター、ロールミル等に、(A)アルキド樹脂、(E)エポキシ樹脂、(M)架橋樹脂、(P)顔料、添加剤、溶剤等の原料を投入した後に作動させ、細かく分散し、均一混合し、裏止め塗膜用組成物とする。   In the production of the composition for a back coating film of the present invention, (A) alkyd resin, (E) epoxy resin, (M) cross-linked resin, (P) pigment, additive, etc. in sand mill, ball mill, attritor, roll mill, etc. Then, after the raw materials such as a solvent are added, the system is operated, finely dispersed, and uniformly mixed to obtain a composition for a back coating film.

本発明の裏止め塗膜用組成物において(P)顔料と(B)合成樹脂バインダーを合わせた重量に対して、モリブデン化合物を、重量百分率で表して、0.1%以上、6.0%以下に含有することが好ましい。モリブデン化合物の含有が0.1%未満の鏡では、耐塩水噴霧性試験、キャス試験において鏡、即ち、鏡膜の耐食性能が低下し、6.0%を越えると裏止め塗膜3の耐水性が低下する。更に、好ましくは、(P)顔料と(B)合成樹脂バインダーを合わせた重量に対して、モリブデン化合物の含有が、0.1%以上、5.0%以下の範囲である。更に好ましくは0.1%以上、3.0%以下の範囲である。   In the composition for a back coating film of the present invention, the molybdenum compound is expressed as a percentage by weight with respect to the total weight of the (P) pigment and the (B) synthetic resin binder, and is 0.1% or more and 6.0%. It is preferable to contain it below. In the mirror containing less than 0.1% of the molybdenum compound, the corrosion resistance of the mirror, that is, the mirror film is deteriorated in the salt spray resistance test and the cast test, and when it exceeds 6.0%, the water resistance of the backing coating film 3 is decreased. Sex is reduced. More preferably, the molybdenum compound content is in the range of 0.1% to 5.0% with respect to the total weight of the (P) pigment and (B) synthetic resin binder. More preferably, it is 0.1 to 3.0% of range.

尚、無鉛防錆顔料には、モリブデン化合物としてのモリブデン酸カルシウム、リンモリブデン酸アルミニウムに加え、水酸化ビスマス、トリポリリン酸アルミニウムおよび/またはカルシウム交換シリカを使用すると、更に、耐食性に優れ鏡を与える裏止め塗膜3が得られる。中でも水酸化ビスマスが有効であり、モリブデン酸カルシウムと水酸化ビスマスの組合せが本発明の防食鏡に優れた防食性能を与える。   For lead-free rust preventive pigments, in addition to calcium molybdate and aluminum phosphomolybdate as molybdenum compounds, bismuth hydroxide, aluminum tripolyphosphate and / or calcium-exchanged silica are used to provide a mirror with excellent corrosion resistance. A stop coat 3 is obtained. Among them, bismuth hydroxide is effective, and the combination of calcium molybdate and bismuth hydroxide gives excellent anticorrosion performance to the anticorrosion mirror of the present invention.

即ち、水酸化ビスマスをモリブデン化合物に対して、重量比で表して、水酸化ビスマス/モリブデン化合物=1.0〜8.0の範囲に加え裏止め塗膜用組成物とし、有機溶剤等を加え裏止め塗膜用塗布液とした後、銀鏡膜1または金属保護膜2に塗布硬化させて裏止め塗膜3となすと、鏡に一層の耐食性能を与える。好ましくは、水酸化ビスマス/モリブデン化合物=2.0〜6.0の範囲である。具体的には、(P)顔料と(B)合成樹脂バインダーを合わせた重量に対して、水酸化ビスマスの含有は、重量百分率で表して、0.1%以上、48.0%以下であり、更に、好ましくは、0.2%以上、36.0%以下である。   That is, bismuth hydroxide is expressed in a weight ratio with respect to the molybdenum compound, and added to the range of bismuth hydroxide / molybdenum compound = 1.0 to 8.0 to make a composition for a back coating film, and an organic solvent is added. After the coating liquid for the back coating film is applied and cured on the silver mirror film 1 or the metal protective film 2 to form the back coating film 3, the mirror is given further corrosion resistance. Preferably, it is the range of bismuth hydroxide / molybdenum compound = 2.0 to 6.0. Specifically, the content of bismuth hydroxide is 0.1% or more and 48.0% or less, expressed as a percentage by weight, based on the combined weight of the (P) pigment and (B) the synthetic resin binder. Further, it is preferably 0.2% or more and 36.0% or less.

このようにして得られた裏止め塗膜組成物を、ガラス基材G上に鏡膜、金属保護膜2を順次スプレー等の適宜膜形成手段で形成した該金属保護膜2上に、フローコーター、スプレー、ローラー、刷毛塗り等の手段で、乾燥硬化させ、裏止め塗膜3とした際に膜厚が30μm〜80μmになるように塗布する。更に、これを常温乾燥、即ち、20℃以上、200℃以下に加熱して架橋による硬化反応を促進させ裏止め塗膜3を金属保護膜2上に形成し、鏡を完成させる。硬化温度は、好ましくは100℃以上、200℃以下である。   The coating film composition thus obtained was coated on the glass substrate G by a suitable film forming means such as a mirror film and a metal protective film 2 in sequence by a flow coater. The film is dried and cured by means of spraying, rollering, brushing, or the like, and applied to have a film thickness of 30 μm to 80 μm when the back coating film 3 is formed. Furthermore, this is dried at room temperature, that is, heated to 20 ° C. or higher and 200 ° C. or lower to accelerate the curing reaction by crosslinking to form the backing coating film 3 on the metal protective film 2 to complete the mirror. The curing temperature is preferably 100 ° C. or higher and 200 ° C. or lower.

尚、本発明の裏止め塗膜用組成物を塗布後硬化させた裏止め塗膜3が形成されてなる防食鏡において、鏡膜には銀鏡膜1が挙げられる。銀鏡膜1とは、銀のみを使用するだけでなく、銀にクロムまたはチタン等の金属を混在させ耐食性を高めた銀鏡膜1を含む。   In addition, in the anticorrosion mirror in which the back coating film 3 formed by applying and curing the back coating film composition of the present invention is formed, the mirror film includes the silver mirror film 1. The silver mirror film 1 includes not only silver but also a silver mirror film 1 in which a metal such as chromium or titanium is mixed in silver to improve corrosion resistance.

尚、本発明の裏止め塗膜用組成物を塗布後硬化させた裏止め塗膜3が形成されてなる防食鏡において、銀鏡膜1を保護する金属保護膜2には、一般的に使用される銅膜が挙げられるが、化学的安定性が高く、銀鏡膜1との密着性がよく、銀鏡膜1と同等な塗膜形成法で形成されるニッケル、ニッケル合金、錫、錫合金等も、金属保護膜2の材料として挙げられる。   In addition, in the anticorrosion mirror in which the back coating film 3 formed by applying and curing the back coating film composition of the present invention is formed, the metal protective film 2 that protects the silver mirror film 1 is generally used. The copper film has high chemical stability, good adhesion to the silver mirror film 1, and nickel, nickel alloy, tin, tin alloy, etc. formed by the same film forming method as the silver mirror film 1 are also available. And a material for the metal protective film 2.

該銅膜(保護金属膜2)上に、フローコーター、スプレー、ローラー、刷毛塗り等の適宜手段で裏止め塗膜用組成物を塗布し、硬化させて裏止め塗膜3として鏡を完成する。   On the copper film (protective metal film 2), the composition for the back coating film is applied by an appropriate means such as a flow coater, spray, roller, brush coating, etc., and cured to complete the mirror as the back coating film 3. .

表1に示す実施例1〜11の組成の、本発明の組成範囲に属する各裏止め塗膜用組成物を用意した。次いで、表2に示す比較例1〜7の組成の、本発明の組成範囲に属さない各裏止め塗膜用組成物を用意した。   Each composition for back coating films belonging to the composition range of the present invention having the compositions of Examples 1 to 11 shown in Table 1 was prepared. Subsequently, each composition for back coating films which does not belong to the composition range of this invention of the composition of Comparative Examples 1-7 shown in Table 2 was prepared.

Figure 0004883957
Figure 0004883957

Figure 0004883957
Figure 0004883957

表1、表2に示すように、(P)顔料における無鉛防錆顔料としてモリブデン酸カルシウム、リンモリブデン酸アルミニウム、トリポリリン酸アルミニウム、カルシウム交換シリカ、水酸化ビスマス、着色顔料として酸化鉄、カーボン、体質顔料として炭酸カルシウム、沈降性硫酸バリウム、タルクを使用した。単位は重量%である。   As shown in Tables 1 and 2, as lead-free rust preventive pigments in (P) pigments, calcium molybdate, aluminum phosphomolybdate, aluminum tripolyphosphate, calcium exchange silica, bismuth hydroxide, and iron oxide, carbon, constitution as coloring pigments Calcium carbonate, precipitated barium sulfate, and talc were used as pigments. The unit is% by weight.

また、(B)バインダー樹脂組成物として(A)アルキド樹脂、(E)エポキシ樹脂、(M)架橋樹脂を使用した。具体的には(A)アルキド樹脂として、フェノール変性アルキド樹脂液(不揮発分、50重量%)、フェノール変性以外のアルキド樹脂液(不揮発分、50重量%)を使用した。また、(E)エポキシ樹脂として、エポキシ樹脂液(不揮発分、65重量%)を使用した。また、(M)架橋樹脂源として、アミノ樹脂液(不揮発分、60重量%)、ブロックイソシアネート樹脂液(不揮発分、60重量%)を使用した。   Moreover, (A) alkyd resin, (E) epoxy resin, and (M) crosslinked resin were used as (B) binder resin composition. Specifically, as the (A) alkyd resin, a phenol-modified alkyd resin liquid (nonvolatile content, 50% by weight) and an alkyd resin liquid other than phenol-modified (nonvolatile content, 50% by weight) were used. Moreover, the epoxy resin liquid (nonvolatile content, 65 weight%) was used as (E) epoxy resin. As the (M) cross-linked resin source, an amino resin liquid (nonvolatile content, 60% by weight) and a blocked isocyanate resin liquid (nonvolatile content, 60% by weight) were used.

これら(P)顔料を(B)バインダー樹脂組成物を溶剤に分散させ、乾燥剤、消泡剤、レベリング剤等を加えて裏止め塗膜用塗料とした。   These (P) pigments were dispersed in the (B) binder resin composition, and a desiccant, an antifoaming agent, a leveling agent, and the like were added to obtain a coating material for a backing coating film.

具体的には、溶剤として、キシレン、N−ブタノール、メトアセ(3−メトキシブチルアセテート)、裏止め塗膜用素生物中の(M)架橋樹脂の硬化反応を促進させるためのドライヤーとしての12重量%のオクチル酸コバルトを、沈殿防止剤としてのベントナイト、消泡剤、レベリング剤を加えた。   Specifically, as a solvent, xylene, N-butanol, meteace (3-methoxybutyl acetate), 12 weight as a dryer for accelerating the curing reaction of the (M) cross-linked resin in the back coating film organism % Of cobalt octylate was added with bentonite, antifoaming agent and leveling agent as suspending agents.

尚、表1および表2の下表に、裏止め塗膜3を形成した後の裏止め塗膜3の重量に対する、無鉛防錆顔料の含有率を重量百分率で示した。また、(P)顔料と(B)合成樹脂バインダーの重量比を示すと共に、不揮発分に換算した後に(A):(E):(M)で表される(A)アルキド樹脂の重量比、エポキシ樹脂の重量比、(M)架橋樹脂の重量比を示した。   In Tables 1 and 2, the content of the lead-free rust preventive pigment relative to the weight of the back coating film 3 after forming the back coating film 3 is shown as a percentage by weight. Moreover, while showing the weight ratio of (P) pigment and (B) synthetic resin binder, and converting into a non-volatile content, the weight ratio of (A) alkyd resin represented by (A) :( E) :( M), The weight ratio of epoxy resin and the weight ratio of (M) crosslinked resin are shown.

各組成物の製造または販売元、商品名について、表3に示した。   Table 3 shows the manufacture or distributor of each composition and the trade name.

Figure 0004883957
Figure 0004883957

ガラス板Gにスプレーを用い、メッキ法により、図1に示すように、銀鏡膜1、金属保護膜2としての銅膜を順次積層形成し、更に、銅膜上に裏止め塗膜用組成物を夫々フローコーターにて硬化時の膜厚が50μmになるように塗布し、電気熱風循環乾燥炉にて8分間、板温150℃で焼付け、言い換えれば、乾燥硬化させて裏止め塗膜3を形成し、20℃で3日間静置後、サイズ、10cm×20cmに裁断し試験片とし、表4に示す各試験を行った。   As shown in FIG. 1, by using a spray on a glass plate G, a copper film as a silver mirror film 1 and a metal protective film 2 is sequentially laminated as shown in FIG. 1, and further, a composition for a backing coating film on the copper film Each was coated with a flow coater so that the film thickness at the time of curing was 50 μm, and baked at a plate temperature of 150 ° C. for 8 minutes in an electric hot air circulating drying oven, in other words, dried and cured to form the backing coating film 3. After forming and leaving still at 20 degreeC for 3 days, it cut | judged to a size and 10 cm x 20 cm to make a test piece, and each test shown in Table 4 was done.

Figure 0004883957
Figure 0004883957

表4に示す各試験を行った結果を、実施例1〜11については表5に、比較例1〜7については、表6に示す。評価基準をクリヤーしたものを〇、クリヤーしなかったものを×とする   The results of each test shown in Table 4 are shown in Table 5 for Examples 1 to 11 and in Table 6 for Comparative Examples 1 to 7. The one that cleared the evaluation criteria is ◯, and the one that did not clear is ×.

Figure 0004883957
Figure 0004883957

Figure 0004883957
Figure 0004883957

本発明による実施例1〜11の裏止め塗膜用組成物を用いてなる鏡は、表5に示すように、耐酸性試験、耐温水性試験、耐塩水噴霧性試験、キャステストにおいて良好な結果が得られ、防食性に優れる防食鏡であった。それに対して、本発明の裏止め塗膜用組成物の範囲から外れた比較例1〜7の鏡は、表6に示すように、各試験において良好な結果が得られず、防食性に劣り、防食鏡と呼べるものではなかった。   As shown in Table 5, the mirror using the compositions for back coating films of Examples 1 to 11 according to the present invention is good in acid resistance test, warm water resistance test, salt spray resistance test, and cast test. The result was obtained and the anticorrosion mirror was excellent in anticorrosion properties. On the other hand, as shown in Table 6, the mirrors of Comparative Examples 1 to 7 deviated from the range of the composition for backing coating film of the present invention did not give good results in each test and were inferior in corrosion resistance. It couldn't be called an anti-corrosion mirror.

鏡の概略断面図である。It is a schematic sectional drawing of a mirror.

符号の説明Explanation of symbols

G ガラス板
1 銀鏡膜
2 金属保護膜
3 裏止め塗膜
G Glass plate 1 Silver mirror film 2 Metal protective film 3 Back coating film

Claims (6)

ガラス板に金属膜が形成され該金属膜上に無鉛の裏止め塗膜が被覆形成されてなる防食鏡を作製するための少なくとも無鉛防錆顔料を含む(P)顔料と(B)合成樹脂バインダーからなる裏止め塗膜用組成物であって、
(B)合成樹脂バインダーに、(P)顔料が(P)/(B)= 1.2〜4.0の重量比で分散されてなり、無鉛防錆顔料がモリブデン化合物であり、
該モリブデン化合物がモリブデン酸カルシウムおよび/ またはリンモリブデン酸アルミニウムであり、
前記(B)合成樹脂バインダーが、(A) アルキド樹脂と(E)エポキシ樹脂と(M) 架橋樹脂とからなり、(A):(E):(M)=60 .0〜95 .0:1 .0〜30. 0:1.0〜30.0重量比であり、
前記(M)架橋樹脂が、アミノ樹脂および/またはブロックイソシアネート樹脂であり、
前記(P) 顔料と前記(B)合成樹脂バインダーを合わせた重量に対して、モリブデン化合物が、重量百分率で表して、0.1%以上、6.0%以下の範囲で含有されてなる、
ことを特徴とする裏止め塗膜用組成物。
A (P) pigment and (B) a synthetic resin binder containing at least a lead-free rust-preventing pigment for producing a corrosion-resistant mirror in which a metal film is formed on a glass plate and a lead-free backing coating film is formed on the metal film. A composition for a back coating film comprising:
(B) In the synthetic resin binder, the (P) pigment is dispersed in a weight ratio of (P) / (B) = 1.2 to 4.0, the lead-free rust preventive pigment is a molybdenum compound,
The molybdenum compound is calcium molybdate and / or aluminum phosphomolybdate,
The (B) synthetic resin binder comprises (A) an alkyd resin, (E) an epoxy resin, and (M) a crosslinked resin, and (A) :( E) :( M) = 60. 0-95. 0: 1. 0-30. 0: 1.0-30.0 weight ratio,
The (M) crosslinked resin is an amino resin and / or a blocked isocyanate resin,
The molybdenum compound is contained in a range of 0.1% or more and 6.0% or less in terms of weight percentage with respect to the combined weight of the (P) pigment and the (B) synthetic resin binder.
A composition for a backing coating film characterized by the above.
前記(P)顔料が、無鉛防錆顔料、着色顔料、体質顔料を併せたものであることを特徴とする請求項1に記載の裏止め塗膜用組成物。   The composition for a back coating film according to claim 1, wherein the (P) pigment is a combination of a lead-free rust preventive pigment, a color pigment, and an extender pigment. 前記無鉛防錆顔料が、モリブデン化合物に加え、水酸化ビスマス、トリポリリン酸アルミニウムおよび/またはカルシウム交換シリカであることを特徴とする請求項1又は請求項2に記載の裏止め塗膜用組成物。   The composition for a backing coating film according to claim 1 or 2, wherein the lead-free rust preventive pigment is bismuth hydroxide, aluminum tripolyphosphate and / or calcium exchange silica in addition to a molybdenum compound. 無鉛防錆顔料が、モリブデン化合物に加え水酸化ビスマスが、重量比で表して、水酸化ビスマス/ モリブデン化合物=1.0〜8.0の範囲で含有されてなることを特徴とする請求項1乃至請求項3の何れか1項に記載の裏止め塗膜用組成物。 The lead-free rust preventive pigment is characterized in that bismuth hydroxide is contained in a range of bismuth hydroxide / molybdenum compound = 1.0 to 8.0 in a weight ratio in addition to the molybdenum compound. The composition for backing coating films according to any one of claims 3 to 4. 請求項1乃至請求項4のいずれか1項に記載の裏止め塗膜用組成物を塗布後硬化させた裏止め塗膜が形成されてなることを特徴とする防食鏡。 An anticorrosion mirror comprising a backing coating film formed by applying and curing the backing coating composition according to any one of claims 1 to 4 . 前記硬化が20℃以上、200℃以下に加熱して行なわれたことを特徴とする請求項5に記載の防食鏡。 6. The anticorrosion mirror according to claim 5 , wherein the curing is performed by heating to 20 ° C. or more and 200 ° C. or less.
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