JP2010000330A - Corrosion-proof mirror and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a corrosion-proof mirror having superior corrosion resistance in the corrosion-proof mirror formed with an edge coating film formed by applying an edge coating material to the back side of the mirror; and a manufacturing method of corrosion-proof mirrors for highly massively manufacturing the corrosion-proof mirrors with the smooth edge coating material of uniform film thickness for providing the superior corrosion resistance. <P>SOLUTION: This corrosion-proof mirror 1 is formed with the strip-like edge coating film 6 with the thickness of not less than 20 &mu;m and not more than 200 &mu;m at the edge part of the mirror formed with a back coating film 4 on the back side from a mirror edge part that is defined as a start point to a position of not less than 20 mm and not more than 50 mm. A roll coater having a coating liquid pickup roll, a regulation roll and a coating roll that are operatively connected together side by side is used for the edge coating. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to an anticorrosion mirror in which an edge coating is applied to an edge portion of a mirror back surface on which a back coating film is formed for protection of a silver mirror film and a metal film, and a manufacturing method for the anticorrosion mirror. Regarding the method.

  A general-purpose mirror used for figure-viewing, etc., applies a silver solution to a glass plate, which is a transparent plate by spraying, forms a silver mirror film by a silver mirror reaction, and forms a copper film in the same manner as the upper layer, A back coating film for protecting the silver mirror film and the copper film is formed on the upper layer by the curtain flow coating method. Normally, after cleaning and polishing the glass plate, while silver is deposited on the upper surface while conveying on the conveyor which is a device that automatically and continuously conveys, so that the silver boundary film firmly adheres to the glass plate, Disperse tin chloride solution, apply silver solution to the transported glass plate, deposit silver by silver mirror reaction to form a silver mirror film, form a copper film in the same procedure on the upper layer, silver mirror film on the upper layer and In order to protect the copper film, a back coating film is formed by applying a back coating and baking and drying, and a silver mirror film, a copper film, and a back coating film are sequentially laminated.

  However, even if a back coating film for protecting the silver mirror film and the copper film is applied, if the chamfering process is performed on the back end of the mirror, a metal such as a copper film for protecting the silver mirror film and the silver mirror film on the processed part Since the film is exposed, it is easy to come into contact with moisture and the like, and the metal film is easily altered and discolored. This discoloration spreads when the silver mirror film and the copper film are eroded from the inside to the edge, resulting in a fringe defect. The edge shard is a corrosive form in which a corrosive substance penetrates from the cut surface of the mirror and invades the silver mirror film and the copper film, and many are seen in a semicircular shape or a belt shape at the end of the mirror.

  Mirrors are affected by moisture and oxygen through the backing coating during harsh environments and for long periods of time, causing local cell action at the interface between the silver mirror film and the copper film, and are made of copper that is more easily ionized than silver. Corrosion of the silver film is suppressed by the sacrificial anticorrosive action that corrodes the copper film. However, if contact with moisture or oxygen continues, it will eventually progress to corrosion of the silver mirror film. In addition, the chlorine which exists in the trace amount which exists in tap water promotes this corrosion. Corrosion progresses faster as the ambient temperature increases.

  Therefore, in order to prevent edge blemishes or the like from easily occurring, in the anticorrosive mirror, edge coating paint for protecting the silver mirror film and the metal film is applied to the chamfered portion and the back edge portion of the mirror in the vicinity thereof. . In particular, when used in a place where moisture easily comes into contact with water, such as a bath or a toilet, it is necessary to apply edge coating to the edge of the mirror. In addition, as an eco-friendly eco specification, the back mirror has been replaced with a back coating film that does not use lead pigment, and it is also expected that it will shift to a mirror that does not form a copper film to protect the silver mirror film. The Among them, the edge coating of the edge part of the back mirror is important.

  When used in places where moisture is easily contacted and corroded, such as in baths and toilets, the anti-corrosion is applied to the entire mirror back using a resin solution similar to the edge coating solution to improve the mirror's corrosion resistance. Although a mirror may be used, it is expensive to perform clear coating on the entire back surface of the mirror. Therefore, it is possible to improve the anti-corrosion performance of the mirror by providing a wide edge coating on the back side edge of the mirror where the metal film is exposed or easily damaged and corroded during handling. preferable.

  Various types of edge coatings have been proposed. For example, the present applicants disclosed in Patent Document 1 a metal protective film made of a glass substrate edge, a silver mirror film, copper or the like, a back protective film (back coating film). An edge coating solution containing a bisphenol type epoxy resin, an ortho-cresol novolak type epoxy resin, an epoxy curing agent, and a silane coupling agent, which adheres firmly to the surface and exhibits an excellent anticorrosive effect over a long period of time. In addition, the present applicants disclosed in Patent Document 2 an aqueous rim coating solution containing an acrylic silicone resin emulsion that is water-based and can be cured in a short time, and that easily forms a coating on the mirror edge. .

  Various apparatuses for applying such a rim coating liquid have been proposed. For example, the applicant of the present application transferred a paint from a paint tank to a paint supply roll while transferring the mirror back to Patent Document 3 on the upper side. , A coating device for the mirror back end portion that guides and paints to the back end edge portion of the mirror via a paint guide and an application roll. Further, in Patent Document 4, a coating roller is disposed in contact with an object to be coated, the coating roller is surrounded by a wall material, and a paint reservoir is formed by the peripheral surface of the coating roller and the wall material. A coating apparatus is disclosed in which a coating liquid is allowed to flow down along a roller circumferential surface from a gap to coat an object to be coated, and a coating device is further formed by forming an annular groove on the roller circumferential surface.

  Each of Patent Documents 3 and 4 is an apparatus for coating the edge of the mirror with the back surface of the mirror as the upper surface, and there is a problem that the edge coating liquid tends to sag on the end surface or the mirror surface side.

  The mirror back end coating apparatus of Patent Document 3 is convenient for painting the back end edge widely and uniformly, but it is not always simple because of the large number of coating liquid transmission members, and is suitable for continuous coating. Absent. In the coating apparatus of Patent Document 4, it is not easy to adjust the gap between the coating roll and the wall material, and it is difficult to form a coating film having a desired thickness.

  Therefore, the applicant of Patent Document 5 states that the conventional problem that the coating liquid hangs on the mirror end surface and easily reaches the surface side is solved in Patent Document 5, and contamination of the mirror surface due to roller deposits or the like is prevented. An apparatus for coating the part with a rotating painting roller that contacts and rotates from the lower side to the edge area of the back surface while transferring the mirror onto the conveyor with the back side as the lower side. The lower part of the coating roller is immersed in the coating liquid in the coating tank, and the coating liquid adheres to the outer periphery of the roller as the coating roller rotates, and the back edge part coating device body of the mirror that touches the upper end of the roller, the coating roller and the mirror The application device for the back end portion of the mirror has been disclosed that includes a pressing force adjusting mechanism that appropriately applies a relative pressing force to the back surface, and a coating liquid amount control mechanism that is applied to the back side edge portion of the mirror.

Further, the present applicant has disclosed in Patent Document 6 a grip portion and a coating rotation drive portion disposed at the tip thereof, the rotation drive portion being an electric motor and a small diameter shaft-attached to one end of the motor shaft. A large-diameter pulley that is supported by the pulley and the rotary drive unit and rotates in conjunction with the small-diameter pulley via a belt is arranged. A coating liquid reservoir adjacent to the mirror and a scanning guide rod in contact with the side edge of the mirror are arranged, and a vertical groove hole is formed by cutting out a part of the coating roller adjacent side frame of the coating liquid reservoir. Disclosed is a handy-type simple mirror rim coater in which one end of a painting roller is inserted into the hole and brought into contact with the coating liquid.
JP 2005-307179 A JP 2006-219607 A Japanese Utility Model Publication No. 59-10856 JP-A-4-41763 Japanese Unexamined Patent Publication No. 7-31911 JP-A-7-265767

  The chamfered portion at the back end of the mirror is exposed to a silver mirror film and a metal film such as a copper film for protecting the silver mirror film, so that it easily comes into contact with moisture and the like, and the silver mirror film and the metal film are easily altered and discolored. The erosion of a metal film such as a silver mirror film and a copper film spreads from the end to the inner side, and edge freckles are generated.

  In anticorrosive mirrors in which edge coating is applied to the edge of the back of the mirror, which is coated with a back coating film to protect the silver mirror film and metal film, the silver mirror film and copper film Even if a protective backing film is applied, the edge coating is not appropriate, such as when applied with a brush or the like, the film thickness of the edge coating film is non-uniform or unpainted, or there is only a coating with a roll coater. There was a problem that rims were generated.

Corrosion of hot springs, etc., in the state of improper rim coating, for example, cleaning a mirror or a cabinet with a mirror attached with a strong cleaning agent including Cl ⁻ , S, SO ₃ ²⁻ , NH ₄ ⁺ ions If a mirror is installed in a place where gas is prevalent, edge scabs will occur in a short time after installation. In this way, when used in places where moisture is likely to come into contact with water, such as baths and toilets, even if the mirror edge is covered with a rim coating film, if the rim coating is not appropriate, the rim will be removed in a short time. There was a problem that occurred.

  An object of the present invention is to provide an anti-corrosion mirror having an anti-corrosion mirror having an anti-corrosion performance in which an edge coating film is formed by applying an edge coating to the back side of the mirror. Furthermore, an object of the present invention is to provide a method for producing an anticorrosion mirror, which is capable of producing an anticorrosion mirror having a uniform film thickness and a smooth edge coating film with high productivity in order to obtain excellent corrosion resistance.

  FIG. 1 is an enlarged cross-sectional view of an example of an edge portion of the anticorrosion mirror of the present invention.

  As shown in FIG. 1, the anticorrosion mirror 1 is usually provided with a silver mirror film 2 on a glass substrate G, a copper film 3 as a silver boundary film protective film thereon, and a back coating material applied thereon. After the back coating film 4 is provided, the edge is chamfered, and the edge coating film 6 is applied and formed on the processed surface 5 and its vicinity.

  In the anticorrosion mirror 1, as shown in FIG. 1, edge coating is performed on the processed surface 5 and the back coating film 4 in order to prevent corrosion due to moisture or the like from the edge, that is, edge scum. The backing coating film 4 on the edge of the anti-corrosion mirror 1 is easily scratched by handling during installation, etc., and when it is scratched, the moisture that has entered from it comes into contact with the silver mirror film 2 or the copper film 3 to cause edge scum. appear. In addition, mirrors around water such as baths and toilets are often washed with water containing a detergent, so that the bottom edge of the anticorrosion mirror 1 can retain water. Therefore, in the anti-corrosion mirror 1, it is preferable to apply the strip-shaped edge coating film 6 for protecting the edge portion and preventing corrosion in a wide range.

  FIG. 2 is a plan view of an example of the anticorrosion mirror of the present invention as viewed from the back side.

  Most of the mirror products are rectangular, and most of them are used in a state that is horizontal to the wall surface and perpendicular to the ground. Also, most of the cleaning agents, tap water, etc. that have an adverse effect on the mirror are liquids, and they tend to collect as a water film and a puddle on the lower side of the rectangular mirror. Occur intensively. Therefore, as shown in FIG. 2, the anticorrosion performance of the mirror can be remarkably improved by applying a wide edge coating of the edge coating material to the lower side portion and providing the belt-like edge coating film 6. It becomes.

  If the range to which the edge coating film 6 is applied is smaller than 20 mm from the mirror end, it is not large enough for the water film and the water pool. In the lower side, this becomes remarkable. Therefore, the range in which the edge coating film 6 is applied is preferably 20 mm or more from the edge of the anticorrosion mirror 1. Applying more than 50 mm from the edge of the anti-corrosion mirror 1 is usually not realistic considering that the edge coating is applied by brush or roll coater, leading to an increase in price.

  Moreover, when the thickness of the edge coating film 6 is thinner than 20 μm, the protective effect of the metal film such as the silver mirror film 2 and the copper film 3 is small. Further, it is difficult to apply a coating thicker than 200 μm with a roll coater, and it takes time to dry and is not practical. Air bubbles are likely to be generated in the edge coating film 6 and the corrosion resistance is likely to be deteriorated.

  That is, the present invention provides a belt-like shape having a thickness of 20 μm or more and 200 μm or less at the edge of the mirror having the back coating film formed on the back side, from the end of the mirror 1 to a position of 20 mm or more and 50 mm or less. The anticorrosion mirror 1 is characterized in that an edge coating film 6 is formed.

  Furthermore, in the anticorrosion mirror 1 of the present invention, in particular, at the edge portion of the mirror having a back coating film formed on the back surface side, at least at the edge portion serving as the lower side when the anticorrosion mirror is used, the mirror end portion is the starting point. It is preferable to form a belt-like edge coating film 6 having a thickness of 20 μm or more and 200 μm or less by a position of 20 mm or more and 50 mm or less.

  As the rim coating material, it is preferable to use an epoxy resin and an acrylic silicon resin that form a rim coating film 6 that, when cured, has excellent durability such as water resistance and excellent anticorrosion effect on the mirror.

  Moreover, this invention is said anticorrosion mirror characterized by the edge coating material for forming the said edge coating film 6 being chosen from an epoxy resin or an acrylic silicon resin.

  As the edge coating liquid containing an epoxy resin for forming the edge coating film 6 of the anticorrosive mirror 1 of the present invention, for example, the drying and curing can be completed in a short time. In other words, the edge coating film is excellent in quick drying. In this case, the glass substrate G edge edge glass surface, the silver mirror film 2, the copper film 3 and the like are firmly fixed to the metal film and the back coating film 4, and have excellent corrosion resistance and excellent anticorrosion effect for a long time. In order to obtain the mirror 1, it is preferable to use an edge coating liquid containing a bisphenol type epoxy resin. In particular, in addition to bisphenol type solid epoxy resin, bisphenol type liquid epoxy resin and orthocresol novolac type epoxy resin are used, and quick-drying adjusts the epoxy equivalent of each epoxy resin and the weight ratio thereof. Is preferably used.

  In the anti-corrosion mirror 1 of the present invention, the edge coating film 6 has the effect of containing a bisphenol liquid epoxy resin and an orthocresol novolak epoxy resin in addition to the bisphenol solid epoxy resin in the edge coating liquid. It has excellent quick-drying properties when coating and forming, and by adjusting the epoxy equivalent and the weight ratio of each epoxy resin, a metal film comprising a glass surface, a silver mirror film 2, a copper film 3, etc., a backing coating film No. 4 was firmly fixed to increase the corrosion resistance.

  Thus, in order to give the anticorrosion performance excellent in the anti-corrosion mirror 1 of this invention, (A) bisphenol-type liquid epoxy resin (epoxy equivalent, 150-300), (B) bisphenol is used for edge coating. Type solid epoxy resin (epoxy equivalent, 450-3300), (C) orthocresol novolak type epoxy resin (epoxy equivalent, 180-300), (D) epoxy curing agent, (E) rim coupling containing silane coupling agent Using a coating liquid, it is preferable to form a strip-like edge coating film 6 having a thickness of 20 μm or more and 200 μm or less from the mirror end to the position of 20 mm or more and 50 mm or less, with a uniform and smooth film thickness. .

  In the present invention, the edge coating composition for forming the edge coating film 6 includes (A) a bisphenol liquid epoxy resin (epoxy equivalent, 150 to 300), and (B) a bisphenol solid epoxy. Resin (epoxy equivalent, 450-3300), (C) orthocresol novolac epoxy resin (epoxy equivalent, 180-300), (D) epoxy curing agent, (E) silane coupling agent The anticorrosion mirror 1 described above.

  Furthermore, in the present invention, the weight ratio of (A) bisphenol type liquid epoxy resin (epoxy equivalent, 150 to 300) and (B) bisphenol type solid epoxy resin (epoxy equivalent 450 to 3300) is (A): (B) = 30: 70 to 90:10, and the weight ratio of (C) ortho-cresol novolac type epoxy resin (epoxy equivalent 180 to 300) to (A) + (B) is ((A) + ( B)): (C) = 100: 1 to 100: 20 The anticorrosion mirror 1 described above.

  In addition, an epoxy equivalent is an equivalent per epoxy group, and the unit is g / equiv according to “Epoxy equivalent test method of epoxy resin” JIS K7236: 2001.

  Moreover, in order to give the anticorrosion performance excellent in the anti-corrosion mirror 1 of this invention, the water-based edge coating liquid containing the acrylic silicone resin, especially the acrylic silicone resin emulsion by which an acrylic silicone resin is disperse | distributed to water is used. The edge coating film 6 may be formed.

  In the anticorrosion mirror 1 of the present invention, the acrylic silicone resin emulsion resin is used for the edge coating liquid, so that the curing is completed in a short time while being aqueous, and the edge coating film 6 on the edge of the anticorrosion mirror 1 is formed. By forming a strip-like edge coating film 6 having a thickness of 20 μm or more and 200 μm or less from a mirror end to a position of 20 mm or more and 50 mm or less starting from the mirror end, the film thickness is uniform and smooth. The anticorrosion mirror 1 which adhere | attached firmly to the metal film which consists of a surface, the silver mirror film 2, the copper film 3, etc., and the back coating film 4, and had the anticorrosion effect over the long term was obtained.

  Further, the present invention is an aqueous rim coating liquid characterized in that the rim coating material for forming the rim coating film contains an acryl silicone resin emulsion in which an acryl silicone resin is dispersed in water. It is said anti-corrosion mirror 1 characterized by having.

  Further, the present invention provides an acrylic silicon resin emulsion obtained by emulsion polymerization of only a silicon-containing acrylic monomer with the acrylic silicon resin, or emulsion polymerization of a silicon-containing acrylic monomer and another monomer. It is said anti-corrosion mirror 1 characterized by being an acrylic silicon resin emulsion obtained by doing.

  Furthermore, the present invention is the anticorrosion mirror 1 described above, wherein the composition of the acrylic silicon resin is cyclohexyl methacrylate, butyl acrylate, methyl methacrylate and butyl methacrylate, and a silicon monomer.

  In edge coating using a roll coater, a liquid reservoir is provided by attaching to the application roll, and while supplying the edge coating liquid to the application roll, at the same time, the roll surface of the application roll is set to the edge on the back side of the mirror. The conventional method of performing edge coating using a roll coater having only one coating roll while being in contact is not able to keep up with the supply of the edge coating liquid when the edge coating operation is performed continuously. 6 uniform coating and film thickness control become difficult.

  Therefore, in the production of the anticorrosion mirror 1 of the present invention, in order to obtain an anticorrosion mirror having a uniform and smooth edge coating film 6 formed thereon, a coating liquid pickup roll, a preparation roll, and an application roll are arranged, and the outer periphery thereof is arranged. A roll coater composed of three rolls provided in a state where the surfaces are in linear contact, that is, in a state of juxtaposition, was used. Specifically, each roll rotates in conjunction with the outer peripheral surface of the coating liquid pick-up roll soaked in the paint tank filled with the outer peripheral coating liquid. It moved to the outer peripheral surface of the roll, and the coating roll surface was brought into contact with the back surface side edge portion of the mirror, whereby the back surface side edge portion of the mirror was edge coated and the edge coating film 6 was provided.

  At that time, by rotating the roll in conjunction with each other, kneading by creating a pool of the rim coating liquid at the contact point between the outer peripheral surface of the coating liquid pickup roll and the outer peripheral surface of the preparation roll to which the rim coating liquid has adhered, Development is performed so that the edge coating liquid is uniformly supplied to the roll surface of the preparation roll.

  In addition, the present invention rotates the mirror coated with the back coating film on the conveyor with the back side coated with the back coating film facing up, and contacts the edge of the back side from above. An edge coating device is applied to the edge on the mirror back side by the coating roll, the edge coating device for the mirror back side edge comprising the coating liquid pickup roll, the preparation roll and the coating roll which are linked in parallel. The lower part of the coating liquid pick-up roll is immersed in the rim coating liquid in the coating tank disposed below the coating liquid pick-up roll, and the outer periphery of the coating liquid pick-up roll is applied as the coating liquid pick-up roll rotates. Kneading between the coating liquid pick-up roll and the preparation roll rotating together with the rim coating liquid while adhering to the surface and transferring the rim coating liquid to the outer peripheral surface of the preparation roll interlocking with the coating liquid pickup roll. , Key Spread on the outer peripheral surface of the roll, and then transfer the rim coating liquid to the outer peripheral surface of the coating roll that moves in parallel with the preparation roll, and then apply the rim coating to the back edge of the mirror that is conveyed while touching the lower end of the coating roll. It is a manufacturing method of said anti-corrosion mirror 1 characterized by apply | coating a liquid and performing edge coating.

  According to the present invention, an anticorrosion mirror 1 having excellent corrosion resistance performance in which an edge coating film 6 having an edge coating applied to the back side of the mirror is formed. Furthermore, in order to obtain excellent corrosion resistance, a method for producing the anticorrosion mirror 1 for producing the anticorrosion mirror 1 having a uniform film thickness and a smooth edge coating film 6 with high productivity was obtained.

  The present invention provides a belt-like edge having a thickness of 20 μm or more and 200 μm or less at a position of 20 mm or more and 50 mm or less starting from the end of the mirror at the edge of the mirror having a back coating film formed on the back side. The anticorrosion mirror 1 is characterized in that a coating film 6 is formed.

  The edge coating liquid for forming the edge coating film 6 in the anticorrosion mirror of this invention is demonstrated.

  The edge coating liquid includes (A) bisphenol type liquid epoxy resin (epoxy equivalent 150 to 300), (B) bisphenol type solid epoxy resin (epoxy equivalent 450 to 3300), and (C) orthocresol described in Patent Document 1. It is preferable to use an edge coating liquid containing a novolac type epoxy resin (epoxy equivalent 180 to 300), (D) an epoxy curing agent, and (E) a silane coupling agent, and a backing coating film 4 is formed on the back side. An excellent anticorrosive mirror is formed by forming a belt-like edge coating film 6 having a thickness of 20 μm or more and 200 μm or less from the end of the mirror to the position of 20 mm or more and 50 mm or less starting from the mirror end. 1 is obtained.

  The (A) bisphenol type liquid epoxy resin is used at room temperature, that is, at about 20 ° C. which is room temperature, and has an epoxy equivalent of 150 to 300, preferably 180 to 250. When the epoxy equivalent is less than 150, even if the edge coating liquid is applied to the edge of the mirror and then dried and cured, the edge coating film 6 is obtained. The effect is not obtained. Preferably, it is 180 or more. If the epoxy equivalent is greater than 300, the liquid is not liquid and the viscosity increases to become a mucus or solid, and the edge coating film 6 obtained by drying and curing the edge coating liquid becomes brittle, cracks and the like occur, and excellent anticorrosion. The effect is not obtained. Preferably it is 250 or less.

  The said (B) bisphenol type | mold solid epoxy resin is solid at normal temperature, and the epoxy equivalent uses 450-3300, Preferably the thing of the range of 450-2200 is used. When the epoxy equivalent is less than 450, the epoxy resin becomes liquid. If the epoxy equivalent is greater than 3300, the edge coating film 6 obtained by applying and drying and curing the edge coating liquid becomes brittle, cracks and the like occur, and the adhesive force with the edge of the mirror becomes weak. An excellent anticorrosive effect cannot be obtained.

  The weight ratio of (A) bisphenol type liquid epoxy resin to (B) bisphenol type solid epoxy resin is in the range of (A) :( B) = 30: 70 to 90:10, preferably (A ) :( B) = 40: 60-80: 20. (A) A bisphenol liquid epoxy resin is less than 30% by weight, and (B) a bisphenol solid epoxy resin is prepared in a range larger than 70% by weight. The coating film 6 is inferior in water resistance and adhesion to the end of the mirror. On the other hand, the coating formed with (A) the weight ratio of the bisphenol type liquid epoxy resin exceeding 90.0 mass% and (B) the weight ratio of the bisphenol type solid epoxy resin less than 10.0 mass% is a silver mirror film 2, Adhesive strength to the copper film 3 and the back coating film 4 becomes insufficient.

  In addition to (A) bisphenol type liquid epoxy resin and (B) bisphenol type solid epoxy resin, (C) orthocresol novolac type epoxy resin is included, drastically improving the drying property. (C) The ortho cresol novolak epoxy resin has an epoxy equivalent of 180 to 300, preferably 195 to 230. When the epoxy equivalent is less than 180, when the edge coating film 6 is dried and cured after application to the edge portion of the mirror to form the edge coating film 6, the curing speed becomes too fast, the application time is reduced, and the application work is difficult. A preferable epoxy equivalent is 195 or more. When the epoxy equivalent is greater than 300, the viscosity when dissolved is high, and it cannot be uniformly mixed when making a mirror coating solution.

The content of (C) orthocresol novolak type epoxy resin is 1.0 mass% to 20 with respect to the total (A) + (B) of (A) bisphenol type liquid epoxy resin and (B) bisphenol type solid epoxy resin. The range of 0.0% by mass, preferably 2.0% by mass to 15.0% by mass with respect to (A) + (B), and the edge coating film 6 formed with a content of less than 1% by mass, If the drying property is insufficient, that is, the drying is slow and the content exceeds 20.0% by mass, the corrosion resistance of the coating film deteriorates. (D) Since the epoxy curing agent undergoes an addition reaction with the epoxy group in the epoxy resin, an amine curing agent having an amino group in which active hydrogen atoms are bonded to at least two nitrogen atoms in one molecule is used. For example, an amine adduct resin, a polyamide resin, or a polyamine is used as the amine-type curing agent. In the edge coating liquid, the main resins (A), (B), (C) and (D) the epoxy curing agent are mixed immediately before use. After mixing, it is applied to form an edge coating film 6 which is cured by addition reaction between the epoxy group in each of the epoxy resins and the active hydrogen of the amino group in (D) the epoxy curing agent. Is preferably in the range of epoxy group: amino group = 1: 2 to 2: 1 in terms of molar equivalent ratio. Outside the range of the above mixing ratio, the edge coating film 6 is not sufficiently cured.

  (E) The silane coupling agent is obtained by applying the edge coating liquid of the present invention to the oblique section of FIG. In order to be firmly fixed by the glass substrate G, the silver mirror film 2, the copper film 3, and the back coating film 4. (E) The silane coupling agent includes a functional group having an addition reaction or affinity for the glass film G, the silver mirror film 2, and the copper film 3 for protecting the silver boundary film 2, and a back coating that is an organic material. It has a functional group having a reaction or affinity for the resin used for the membrane 4. Examples of the functional group that undergoes an addition reaction with the glass substrate G or has an affinity include a linear or branched alkoxy group such as a methoxy group or an ethoxy group, or a silanol group. On the other hand, examples of the functional group that undergoes addition reaction or affinity with an organic material include a vinyl group, an epoxy group, a methacryl group, an amino group, and a mercapto group.

  Examples of the (E) silane coupling agent having such a functional group include γ-glycidoxypropyltrimethoxysilane, γ-glycidoxypropylmethyldiethoxysilane, γ-glycidoxypropyltriethoxysilane, N- β- (aminoethyl) -γ-aminopropyltriethoxysilane, γ-mercaptopropylmethoxysilane, β- (3,4-epoxycyclohexyl) ethyltrimethoxysilane, γ-chloropropyltrimethoxysilane, etc. .

  The (E) silane coupling agent includes (A) bisphenol type liquid epoxy resin (epoxy equivalent 150 to 300), (B) bisphenol type solid epoxy resin (epoxy equivalent 450 to 3300), (C). Ortho-cresol novolak type epoxy resin (epoxy equivalent 180-300), (D) epoxy hardener, 0.5% by mass to 10% with respect to (A) + (B) + (C) + (D). It mix | blends in the range of 0 mass%. (E) If the silane coupling agent is less than 0.5% by mass, the edge coating film 6 is copper for protecting the glass substrate G, the silver mirror film 2 and the silver boundary film 2 in the processed part 5 of FIG. It does not adhere to the film 3. On the other hand, when the content is more than 10.0% by mass, the edge coating liquid is thickened and gelled and is difficult to apply.

  In order to dissolve the epoxy resins (A), (B), and (C), known organic solvents such as hydrocarbons, esters, ethers, ketones, and alcohols are appropriately used. In addition, a leveling agent, an antifoaming agent, a rheology control agent, and the like are appropriately added in order to improve the workability during coating and the finished appearance after coating.

  (A) Bisphenol type liquid epoxy resin (epoxy equivalent 150-300), (B) Bisphenol type solid epoxy resin (epoxy equivalent 450-3300), (C) Orthocresol novolac type epoxy resin (epoxy equivalent 180- 300), (D) epoxy curing agent, and (E) silane coupling agent, an organic solvent, a leveling agent, an antifoaming agent, and a rheology control agent are appropriately added. After being coated on the edge portion of the mirror and the processed portion 5 at the edge of the mirror back surface that has been chamfered with a roll coater so as to have a dry film thickness of 20 μm or more and 200 μm or less, it is dried and cured at 200 ° C. or less, preferably 180 ° C. The coating film 6 is formed by drying and curing at 5 minutes to complete the anticorrosion mirror 1 covered with the edge of the mirror.

  Moreover, in order to give the anticorrosion performance excellent in the anti-corrosion mirror of this invention, the aqueous | water-based edge coating liquid containing the acryl silicone resin emulsion which disperse | distributes the acryl silicone resin of patent document 2 to water is used. An edge coating film 6 may be formed.

  The acrylic silicone resin emulsion is fast after curing and easy to form the edge coating film 6 on the edge of the anticorrosion mirror. Silicone has high durability and chemical resistance when it is used as the edge coating film 6 and has a high degree of freedom in resin design when polymerizing a resin for obtaining an excellent edge coating film 6. Acrylic silicon resin emulsion obtained by emulsion polymerization of only the containing acrylic monomer, or acrylic silicone resin obtained by emulsion polymerization of a silicon-containing acrylic monomer and another monomer not containing silicon Emulsions are preferably used.

  Examples of the silicon-containing acrylic monomer include γ- (meth) acryloxypropyltrimethoxysilane, γ- (meth) acryloxypropyltriethoxysilane, γ- (meth) acryloxypropylmethyldimethoxysilane, γ- ( Examples include hydrolyzable silyl group-containing vinyl monomers such as (meth) acryloxypropylmethyldiethoxysilane.

  Examples of the other monomer that does not contain silicon copolymerizable with the acrylic monomer include aromatic hydrocarbon vinyl monomers such as styrene, methylstyrene, chlorostyrene, and vinyltoluene; maleic acid, itaconic acid , Crotonic acid, fumaric acid, α, β-ethylenically unsaturated carboxylic acids such as citraconic acid; sulfonic acid-containing vinyl monomers such as styrene sulfonic acid and vinyl sulfonic acid; acid anhydrides such as maleic anhydride and itaconic anhydride Products; chlorine-containing monomers such as vinyl chloride, vinylidene chloride and chloroprene; hydroxyl-containing alkyl vinyl ethers such as hydroxyethyl vinyl ether and hydroxypropyl vinyl ether; alkylene glycols such as ethylene glycol monoallyl ether and propylene glycol monoallyl ether diethylene glycol monoallyl ether Α-olefins such as ethylene, propylene and isobutylene; vinyl esters such as vinyl acetate, vinyl propionate, vinyl butyrate and vinyl pivalate; vinyl ethers such as methyl vinyl ether, ethyl vinyl ether, butyl vinyl ether and cyclohexyl vinyl ether; ethyl Examples include allyl ethers such as allyl ether and butyl allyl ether.

  The acrylic resin emulsion is obtained by, for example, an emulsion polymerization method. There is no particular limitation on the method of emulsion polymerization, and the above-mentioned monomers, chain transfer agents, surfactants, radical polymerization initiators and other additions used as necessary in an aqueous medium by a conventionally known method In a dispersion system having an agent component as a basic composition component, a monomer is polymerized to produce an emulsion.

  Examples of other additive components used as necessary include alkoxysilane and / or organoalkoxysilane. Specific examples include tetraalkoxysilanes such as tetramethoxysilane, tetraethoxysilane, tetra-n-propoxysilane, tetra-i-propoxysilane, tetra-n-butoxysilane; methyltrimethoxysilane, methyltriethoxysilane, Ethyltrimethoxysilane, ethyltriethoxysilane, n-propyltrimethoxysilane, n-propyltriethoxysilane, i-propyltrimethoxysilane, i-propyltriethoxysilane, n-butyltrimethoxysilane, n-butyltriethoxy Silane, n-pentyltrimethoxysilane, n-hexyltrimethoxysilane, n-heptyltrimethoxysilane, n-octyltrimethoxysilane, vinyltrimethoxysilane, cyclohexyltrimethoxysilane, cyclohexyl Rutriethoxysilane, phenyltrimethoxysilane, phenyltriethoxysilane, 3-aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane, 2-hydroxyethyltrimethoxysilane, 2-hydroxyethyltriethoxysilane, 2-hydroxypropyl Trimethoxysilane, 3-hydroxypropyltrimethoxysilane, 3-mercaptopropyltrimethoxysilane, 3-mercaptopropyltriethoxysilane, 3-isocyanatopropyltrimethoxysilane, 3-isocyanatopropyltriethoxysilane, 3-glycid Xylpropyltrimethoxysilane, 3-glycidoxypropyltriethoxysilane, 2- (3,4-epoxycyclohexyl) ethyltrimethoxysilane, 2- (3,4-epoxy Trialkoxysilanes such as cyclohexyl) ethyltriethoxysilane; dimethyldimethoxysilane, dimethyldiethoxysilane, diethyldimethoxysilane, diethyldiethoxysilane, di-n-propyldimethoxysilane, di-n-propyldiethoxysilane, di -I-propyldimethoxysilane, di-i-propyldiethoxysilane, di-n-butyldimethoxysilane, di-n-butyldiethoxysilane, di-n-pentyldimethoxysilane, di-n-pentyldiethoxysilane, Di-n-hexyldimethoxysilane, di-n-hexyldiethoxysilane, di-n-heptyldimethoxysilane, di-n-heptyldiethoxysilane, di-n-octyldimethoxysilane, di-n-octyldiethoxysilane Di-n-cyclohexyl Examples include dialkoxysilanes such as rudimethoxysilane, di-n-cyclohexyldiethoxysilane, diphenyldimethoxysilane, and diphenyldiethoxysilane; monoalkoxysilanes such as trimethylmethoxysilane and trimethylethoxysilane. These alkoxysilanes and / or organoalkoxysilanes are used alone or in admixture of two or more.

  Acrylic silicon resin is composed of cyclohexyl methacrylate, butyl acrylate, methyl methacrylate and butyl methacrylate, and a silicon monomer that is a silicon-containing acrylic monomer or a monomer containing no silicon. It is preferable to use all of them as monomers constituting the monomer. Polymerization of the acrylic silicone resin emulsion is easy to perform, and it is easy to apply when it is made into an aqueous edge coating solution, and the resulting anticorrosion mirror 1 has an excellent anticorrosive effect.

  The mirror edge coating liquid of the present invention obtained by appropriately adding water, a film-forming aid, a leveling agent, and an antifoaming agent to the acrylic silicon resin emulsion is the back edge of the mirror and the chamfered mirror 1 The film is applied to the processed part 5 at the end on the back surface side by a roll coater so that the film thickness is 20 μm to 200 μm. Furthermore, this is accelerated-dried at 80 ° C. or lower, preferably dried at room temperature, to form the edge coating film 6, and the edge of the mirror is coated to complete the anticorrosion mirror 1 as the edge coating film 6.

  Next, when forming the edge coating film 6 in the anti-corrosion mirror 1 of the present invention, the anti-corrosion mirror 1 having a uniform and smooth edge coating film 6 is mass-produced in order to obtain excellent corrosion resistance. The manufacturing method of the anti-corrosion mirror for manufacturing with good property will be described.

  (A) of FIG. 3 is a side view of an example of the edge coating apparatus of the back surface side edge part for manufacturing the anticorrosion mirror of this invention. (B) is a front view of an example of the edge coating apparatus for manufacturing the anti-corrosion mirror of this invention.

  As shown in FIGS. 3A and 3B, the mirror manufacturing method for manufacturing the anti-corrosion mirror 1 of the present invention includes a mirror 7 having a back coating film 6 formed on the back side, as shown in FIGS. The coating liquid 8 is applied to the edge on the back side of the mirror 7 by edge coating with the coating roll 8 which is in contact with the end edge on the back side from above and is rotated. The coating liquid pick-up roll 9, the preparation roll 10, and the coating roll 8, which are in contact with each other, are used in the coating tank 11 disposed below the coating liquid pick-up roll 9 by using an edge coating device on the rear edge of the mirror 7. The lower part of the coating liquid pick-up roll 9 is immersed in the rim coating liquid, and the rim coating liquid is attached to the outer peripheral surface of the coating liquid pick-up roll 9 as the coating liquid pickup roll 9 rotates. Outside of the preparation roll 10 that moves in parallel with the roll 9 While being transferred to the surface, the edge coating liquid is kneaded between the coating liquid pick-up roll 9 and the preparation roll 10 that rotate in conjunction with each other, spread on the outer peripheral surface of the preparation roll 10, and then applied in parallel with the preparation roll 10 It moves to the outer peripheral surface of the roll 8, and applies the edge coating liquid to the back edge part of the mirror 7 conveyed in contact with the lower end of the application roll 8, and is characterized by edge coating.

  At that time, the coating liquid pickup roll 9 is immersed in the coating tank 11 filled with the edge coating liquid while rotating. At that time, the liquid surface height of the edge coating liquid in the coating tank 11 is adjusted so that a desired amount of the edge coating liquid adheres to the outer peripheral surface of the liquid coating pickup roll 9, and the liquid coating pickup roll It is preferable to determine the 9 immersion positions. In order to form the edge coating film 6 having a constant film thickness on the edge on the back surface side of the mirror 7, the liquid surface height of the edge coating liquid in the coating tank 11 is set to a constant height during application. It is preferable to keep. By keeping the liquid level constant, a certain amount of edge coating liquid adheres to the outer peripheral surface of the coating liquid pickup roll 9.

  Next, the outer peripheral surface of the coating liquid pick-up roll 9 to which the edge coating liquid is adhered and the outer peripheral surface of the preparation roll 10 are interlocked by turning around without slipping due to the viscosity of the edge coating liquid. The rim coating liquid is kneaded by making the liquid pool 12 at the outer peripheral surface contact between the coating liquid pick-up roll 9 and the preparation roll 10, and uniformly spread on the outer peripheral surface of the preparation roll 10. Next, the preparation roll 10 and the application roll 8 that are in parallel contact with each other without being slipped with viscosity, so that the outer periphery of the preparation roll 10 is coated with the outer periphery of the application roll 8 as the preparation roll 10 and the application roll 8 rotate. The coating liquid moves. Finally, when the coating roll 8 is pressed against the edge of the mirror 7, the edge coating liquid moves to the rear edge of the mirror 7, and the edge coating film 6 is applied.

  In addition, as a conveyor which is an apparatus which automatically and continuously conveys the mirror 7, as shown in (A) and (B) of FIG. The lower transport roll 13 or the upper transport roll (not shown) is driven by an electric motor or the like so that it can be automatically and continuously carried. Usually, the conveyance roll 13 uses a cylindrical rubber ring with an iron rod inserted as a mandrel.

  In addition, a gear or a belt wheel (not shown) is connected to each mandrel of the coating liquid pickup roll 9, the preparation roll 10, and the coating roll 8 so that the rolls are smoothly interlocked without slipping. Is preferred. Since the coating roll 8 rotates by being pressed against the back surface of the mirror 7 to be transported, it is necessary to install a drive source such as an electric motor on the coating liquid pickup roll 9, the preparation roll 10 and the coating roll 8. Absent.

  It is preferable that the outer peripheral surfaces of the coating liquid pickup roll 9, the preparation roll 10, and the coating roll 8 are embossed or the like in order to hold the edge coating liquid. In order to hold the edge coating liquid, at least the coating roll 8 preferably has a large number of annular grooves on the outer peripheral surface.

  Further, since the application roll 8 continuously contacts the rear surface side end portion 14 of the hard mirror 1, it is preferable to use a hard material that does not have a risk of crushing as a result of continuous coating. Selected from hard resin and the like. Stainless steel is a suitable material because it has excellent resistance to the rim coating liquid without deterioration, and it is easy to process when surrounding a plurality of annular grooves on the surface of the coating roll 8. In consideration, aluminum and aluminum alloy are suitable materials. Aluminum and aluminum alloys are preferably used because they are sufficiently resistant to the edge coating liquid and are easy to process.

  By using a coating roll 8 that has a large number of annular grooves, as a mechanism for controlling the amount of edge coating liquid supplied to the edge on the back side of the mirror 7, for example, a coating liquid scraping branch not shown is used. It is possible to precisely control the amount of liquid to be supplied to the back surface of the coating mirror by removing the edge coating in the annular groove by pressing the coating liquid scraping branches against the outer peripheral surface. It is economical to return the scraped edge coating liquid to the coating tank 11 without discarding it.

  FIG. 4 is a partial enlarged cross-sectional view of an example of an application roll.

  The groove width 16 and the depth 17 of the annular groove 15 provided on the outer peripheral surface depend on the solid content concentration or viscosity of the edge coating liquid. Adjust between 1mm and 2.0mm. A groove having a groove width 16 narrower than 0.1 mm or a shallow depth 17 is difficult to process, and the edge coating film 6 becomes too thin, which is not realistic. A groove having a wider groove width 16 or a deeper depth 17 than 2.0 mm has too much holding amount of the edge coating liquid on the outer peripheral surface of the roll, and the flow of the coating liquid occurs on the outer peripheral surface of the roll, causing unevenness on the outer peripheral surface. Such a problem occurs that it becomes difficult to form the edge coating film 6 having a uniform film thickness.

  As shown in FIG. 4, the annular groove 15 is easily processed to have an inverted triangular cross-section, and each roll is easily interlocked by resistance due to contact with the outer peripheral surface, in other words, easy to attach. It is preferable to chamfer the outer peripheral portion vertex. By doing so, as a mechanism for controlling the coating amount of the edge coating liquid supplied to the back surface edge of the mirror 7, for example, when using a coating liquid scraping branch, the mirror back surface edge It is easy to control the amount of the edge coating liquid to be supplied.

  Further, as a mechanism for appropriately applying a relative pressing force to the coating roll 8 and the mirror 7, for example, in FIG. 3, the coating roll 8 is attached to the tip of an arm (not shown) and the touch width of the arm from the fulcrum is adjusted. A mechanism such as using a leaf spring for the arm itself or adding a spiral spring to the arm can be used. Thus, it is preferable to provide a spring elastic body for adjusting the pressing force in the vicinity of the applying roll 8 as a pressing force adjusting mechanism for appropriately applying a relative pressing force to the applying roll 8 and the mirror 7.

  The anticorrosion mirror of the present invention and the method of manufacturing the anticorrosion mirror 1 include a silver mirror film 2, a metal film such as a copper film 3 for protecting the silver mirror film 2, and a back coating film 4 sequentially laminated on the glass substrate G. In addition to the environmental protection, a mirror in which a silver mirror film 2 and a backing coating film 4 are sequentially laminated on a glass substrate G without using a metal film made of a copper film 3 or the like for protecting the silver mirror film 2 is used. The anticorrosion mirror 1 having a wide belt-like edge coating film is also suitably applied. Further, the present invention is also suitably applied to a lead-free mirror having the back surface protective film 4 using a lead-free pigment.

  As shown in FIG. 1, an anticorrosion mirror 1 having a thickness of 5 mm, which is formed by sequentially laminating a silver mirror film 2, a copper film 3, and a back coating film 4 on one side of a glass substrate G by a known means, was prepared.

Specifically, spraying a silver plating solution comprising a reducing liquid for reducing the silver nitrate solution and silver on one surface of the glass substrate G was washed clean, so that 1.0 g / m ² by silver mirror reaction After the silver mirror film 2 is formed and the film surface is washed with water, a copper plating solution comprising a copper sulfate solution and a reducing solution for reducing copper is sprayed, and the copper film 3 is adjusted to 0.3 g / m ^2. And dried after washing with water. 5. On the copper film 3, 85 parts by weight of epoxy resin and curing agent and 15 parts by weight of cyclohexane-formaldehyde resin are binder / pigment in a weight ratio of pigment / binder = 2.0, and in the pigment composition. After applying a backing coating composed of a leaded pigment containing 0% by mass of lead sulfate to a uniform film thickness with a flow coater, the temperature of the glass substrate G is 140 ° C. in a drying furnace for 6 minutes. The backing coating film 4 having a thickness of 50 μm after drying was formed.

  In addition to the epoxy resin, the resin used for the back coating film 4 includes a melamine resin and an alkyd resin. The pigment includes a leaded pigment made of lead carbonate in addition to a leaded pigment containing lead sulfate, or lead-free. In this example, a leaded pigment containing an epoxy resin and lead sulfate was used. The leaded pigment has a rust prevention effect on the copper film 3.

  The mirror thus produced is cut to a size of 300 mm square, its edge is seamed, and the back surface of the mirror shown in FIG. 3 is formed on the processed portion 5 where the silver mirror film 2 and the copper film 3 are exposed. Use the edge coating device at the side edge and use the edge coating with epoxy resin as the main component or the edge coating with acrylic silicon resin as the main component so that the film thickness and width are the specified. The rim coating was carried out.

  A two-pack type coating composed of a main agent and a curing agent was used as the edge coating composition mainly composed of an epoxy resin.

  The main ingredients are 40 parts by weight of a bisphenol type liquid epoxy resin (epoxy equivalent 184 to 194), 60 parts by weight of a bisphenol type solid epoxy resin (epoxy equivalent 900 to 1000) and an orthocresol / novolac type epoxy resin (epoxy equivalent 205). ˜230) 3 parts by weight, rheology control agent, 4 parts by weight, leveling agent, 0.5 part by weight, 0.5 part by weight of antifoaming agent, methyl isobutyl ketone, methylpropyl glycol, normal butanol, xylene as solvent Etc. were added to adjust the desired solid content concentration and viscosity. As the curing agent, a polyamide resin having an amine value of 235 to 265 and an active hydrogen equivalent amount of 150 (Tomide 437, manufactured by Fuji Chemical Industry Co., Ltd.) was used. These main agent and curing agent were mixed before use.

  The rim coating material mainly composed of acrylic silicon resin uses TG, 20 ° C. acrylic silicone resin emulsion (trade name, Polydurex G623, manufactured by Asahi Kasei Chemicals Co., Ltd.). After adding the agent, it was adjusted to the desired solid content concentration and viscosity by adding pure water.

  As shown in FIG. 3, the mirror 7 formed by coating the back coating film 6 is conveyed on the transport roll 13 with the back side on which the back coating film 6 is formed facing up, and the back side of the mirror 7. The edge coating liquid was applied to the edge on the back side of the mirror 7 by the coating roll 8 that contacted and rotated from the upper edge to the edge. Specifically, the lower part of the coating liquid pickup roll 9 is immersed in the edge coating liquid in the coating tank 11 disposed below the coating liquid pickup roll 9, and the edge coating liquid is applied as the coating liquid pickup roll 9 rotates. A coating liquid pickup that adheres to the outer peripheral surface of the liquid pick-up roll 9 and moves the edge coating liquid to the outer peripheral surface of the preparation roll 10 that moves in parallel with the coating liquid pick-up roll 9 and rotates the edge coating liquid in conjunction with it. Kneading between the roll 9 and the preparation roll 10, spreading on the outer peripheral surface of the preparation roll 10, and then transferring the edge coating liquid to the outer peripheral surface of the application roll 8 co-operating in parallel with the preparation roll 10. The edge coating liquid was applied to the back edge portion of the mirror 7 conveyed while contacting the lower end, and the edge coating was performed after baking.

  The diameter of the coating roll 8 is 50.0 mm, and a large number of annular grooves 15 are provided around the outer peripheral surface of the coating roll 8. The groove width 16 of the annular groove 15 is 0.5 mm and the depth 17 is 0.5 mm. It is.

  The mirror edge thus obtained was immersed in a 1.0% by mass hydrochloric acid solution up to a height of 20 mm, and at room temperature (about 20 ° C.) for 48 hours (hr) and 96 hours (hr). By checking the surface state after 144 hours (hr), the acid resistance was evaluated and the corrosion resistance as the anticorrosion mirror 1 was confirmed.

  Table 1 shows the acid resistance evaluation results of the mirror 7 on which the edge coating film 6 was formed with the edge coating liquid mainly composed of an epoxy resin.

  As shown in Table 1, the mirror on which the edge coating film 6 having a thickness of 10 μm, 30 μm, 50 μm, 80 μm, 120 μm, 200 μm, 250 μm, and 300 μm, and each of the edge coating widths of 10 mm, 20 mm, and 30 mm was formed as described above. It was immersed in a hydrochloric acid solution having a concentration of 1.0% by mass from the end of the mirror by 20 mm. As shown in FIG. 2, the edge coating width 18 is the width of the belt-like edge coating film 6 formed from the end of the mirror 1.

  As shown in Table 1, the mirror on which the edge coating film 6 having a thickness of 30 μm, 50 μm, 80 μm, 120 μm, and 200 μm was formed with an edge coating width of 30 mm and 50 mm starting from the end of the mirror, respectively, was immersed After 144 hours, the mirror surface showed good acid resistance with no abnormality.

  On the other hand, in the mirror 1 having a thickness of the edge coating film 16 of 10 μm, the silver mirror film 2 is corroded after 96 hours with the edge coating widths of 10 mm, 30 mm, and 50 mm, and immersed after 144 hours. The entire part was corroded. This is because the edge coating film 6 is insufficient in thickness and the desired corrosion resistance cannot be obtained.

  Further, the mirror with a border width of 10 mm was corroded after 48 hours of immersion, which was due to the action of a hydrochloric acid solution having a concentration of 1.0% by mass on the backing coating film 4.

  In addition, as a result of immersion in a hydrochloric acid solution having a concentration of 1.0% by mass, the mirror with the thickness of the edge coating film 16 of 250 μm and 300 μm caused foaming on the surface of the edge coating film 6 and was immersed for 96 hours. After the lapse, corrosion of the silver mirror film 2 occurred in all. This is because the hydrochloric acid solution having a concentration of 1.0% by mass entered the edge coating film 6 in which bubbles were generated, and the silver boundary film 2 was attacked.

  In addition, the acid resistance evaluation result of the mirror which formed the edge coating film 6 by the edge coating liquid which has acrylic silicon resin as a main component was also a result equivalent to Table 1. FIG.

It is an expanded sectional view of the edge part of an example of the anti-corrosion mirror of this invention. It is the top view which looked at an example of the anti-corrosion mirror of the present invention from the back side. (A) is a side view of an example of the edge coating apparatus of the back surface side edge part for manufacturing the anticorrosion mirror of this invention. (B) is a front view of an example of the edge coating apparatus for manufacturing the anti-corrosion mirror of this invention. It is a partial expanded sectional view of an example of an application roll.

Explanation of symbols

G Glass substrate 1 Anticorrosion mirror 2 Silver mirror film 3 Copper film 4 Back coating film 5 Processed surface 6 Edge coating film 7 Mirror 8 Coating roll 9 Coating liquid pick-up roll 10 Adjustment roll 11 Paint tank 12 Liquid reservoir 13 Conveying roll 14 End 15 Annular groove 16 Groove width 17 Depth 18 Edge coating width

Claims (8)

A belt-like edge coating film having a thickness of 20 μm or more and 200 μm or less is formed on the edge of the back surface of the mirror on which the back coating film is formed to a position of 20 mm or more and 50 mm or less starting from the mirror end. An anti-corrosion mirror characterized by The anticorrosion mirror according to claim 1, wherein the edge coating material for forming the edge coating film is selected from an epoxy resin or an acrylic silicon resin. The rim coating material for forming the rim coating film includes (A) bisphenol liquid epoxy resin (epoxy equivalent, 150 to 300), (B) bisphenol solid epoxy resin (epoxy equivalent, 450 to 3300), (C) an ortho-cresol novolak type epoxy resin (epoxy equivalent, 180 to 300), (D) an epoxy curing agent, and (E) a silane coupling agent. Anticorrosion mirror described in 1. The weight ratio of (A) bisphenol type liquid epoxy resin (epoxy equivalent, 150 to 300) and (B) bisphenol type solid epoxy resin (epoxy equivalent 450 to 3300) is (A) :( B) = 30: The weight ratio of (C) orthocresol novolak type epoxy resin (epoxy equivalent 180-300) to (A) + (B) is ((A) + (B)) :( C) The anticorrosion mirror according to claim 3, wherein = 100: 1 to 100: 20. The rim coating composition for forming the rim coating film is an aqueous rim coating liquid characterized by containing an acrylic silicon resin emulsion in which an acrylic silicon resin is dispersed in water. The anticorrosion mirror according to claim 2. The acrylic silicon resin is an acrylic silicon resin emulsion obtained by emulsion polymerization of only a silicon-containing acrylic monomer, or an acrylic polymer obtained by emulsion polymerization of a silicon-containing acrylic monomer and another monomer. The anticorrosion mirror according to claim 5, which is a silicone resin emulsion. The anticorrosive mirror according to claim 5 or 6, wherein the composition of the acrylic silicon resin is cyclohexyl methacrylate, butyl acrylate, methyl methacrylate, butyl methacrylate, or a silicon monomer. The mirror coated with the back coating film is transported on the conveyor with the back surface coated with the back coating film facing up, and the back side is rotated by an application roll that rotates while contacting the back side edge from above. Using the edge coating device for the edge of the mirror back side consisting of the coating liquid pick-up roll, the preparation roll, and the coating roll that rotate in parallel with each other.
The lower part of the coating liquid pick-up roll is immersed in the coating liquid in the paint tank located below the coating liquid pick-up roll, and the coating liquid is attached to the outer peripheral surface of the coating liquid pick-up roll as the coating liquid pick-up roll rotates. Let
While transferring the edge coating liquid to the outer peripheral surface of the preparation roll that rotates in conjunction with the coating liquid pickup roll,
Kneading between the coating liquid pick-up roll that rotates the rim coating liquid and the preparation roll, expands on the outer peripheral surface of the preparation roll,
Next, the edge coating liquid is transferred to the outer peripheral surface of the interlocking rotating application roll in parallel with the preparation roll,
The method for producing an anticorrosive mirror according to any one of claims 1 to 7, wherein an edge coating liquid is applied to an edge portion on the back surface side of the mirror that is conveyed while being in contact with the lower end of the coating roll. .

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