JP6836806B2 - Metal mirror surface forming coating method - Google Patents

Description

The present invention relates to a metal mirror surface forming coating method in which a metal layer is formed on the surface of a base material to make a mirror surface state.

As a method of forming a metal layer on the surface of a base material to make it a mirror surface state, there are plating process, vacuum deposition and the like. Generally, as the plating process, for example, as decorative plating, nickel, chromium, gold, silver, brass or the like is subjected to wet plating including electroplating and electroless plating, and dry plating including hot-dip plating, spraying method or vapor phase plating. A plating technique for forming a metal layer on the surface of a base material has been implemented.

Further, as vacuum vapor deposition, a technique is generally used in which a vaporized metal is heated in a vacuum, vaporized and sublimated to form gas molecules, and the vaporized metal collides with and adheres to a base material to form a metal vapor deposition film. It has been implemented.

Patent Document 1 describes a step of applying a coating composition containing a flaky metal pigment, a curable monomer having a molecular weight of 1500 or less, and a solvent on a substrate, and coating the applied coating film at 55 to 65 ° C. 3 A method for producing an article having a metallic surface, which comprises a step of heating for about 5 minutes, drying and curing, is disclosed.

Patent Document 2 has a styrene-maleic anhydride resin structure in an alcohol solvent, and a part of the maleic anhydride is modified with polyalkylene glycol having a terminal hydroxyl group or polyalkylene glycol having a terminal amino group. An alcohol solution in which a polymer dispersant having an acid value of 150 or less is dissolved and at least one silver compound selected from silver oxide and silver carbonate is dispersed is used, and ultrasonic waves are applied to the alcohol solution. The step of spray-coating the surface of the base material with the composition solution for forming a silver mirror film layer, which comprises obtaining an alcohol solution in which silver nanoparticles are dispersed by irradiation, and the spray-coated composition solution for forming a silver mirror film layer. A method for forming a silver mirror film layer including a step of drying at room temperature is disclosed.

JP-A-2017-82030 Japanese Patent No. 5950427

In the case of wet plating, equipment such as a plating solution tank, electrodes and electric power is required, and there is a problem that wastewater treatment is required because plating wastewater causes environmental pollution. In any case, there is a problem that expensive plating equipment is required, such as a vacuum device and a heating equipment being required if the method is used.

In the case of vacuum vapor deposition, a vacuum device or heating device is required, and a closed space must be secured to prevent air dust from adhering to the surface of the base material and forming lumps (small protrusions on the film formation surface). There was a problem of having to. Further, in order to perform vacuum vapor deposition or plating, if the object (corresponding to the base material of the present invention) is a part mounted on an automobile, for example, there is a problem that the object must be removed. It was.

Since the method for producing an article having a metallic surface of Patent Document 1 includes a step of heating a coating film at 55 to 65 ° C. for 3 to 5 minutes to dry and harden it, there is a problem that a heating facility is required. There was a problem that the surface of the article had a metallic luster, but it was not a mirror surface that could reflect the appearance of a person or an image of an object.

The method for forming the silver mirror film layer of Patent Document 2 has a problem that ultrasonic equipment is required because ultrasonic waves are irradiated in an alcohol solution containing silver nanoparticles.

The present invention was devised in view of these problems, and does not require plating equipment such as vacuum equipment, heating equipment, ultrasonic equipment, or vacuum vapor deposition equipment, and the parts to be formed with a metal mirror surface can be mounted without being removed. It is an object of the present invention to provide a metal mirror surface forming coating method for making the surface of a base material into a mirror surface state even in a space where dust is suspended in the air in the above state.

The metal mirror surface forming coating method according to claim 1 comprises flat, flat or spherical metal particles , and an adhesive composition for adhering the metal particles to a substrate , and polishing the metal particles. While applying or applying the agent-free coating composition to the surface of the base material, the buff is applied to the coating composition on the surface while performing spreading work and pressing work with a buff. It is characterized by comprising a metal particle layer forming step in which the metal particles are attached onto the surface to form a metal layer by moving the metal layer, and the surface of the metal layer becomes a mirror surface reflected at the same level as reflected in a mirror. To do.

The metal mirror surface forming coating method according to claim 2 is characterized in that, in claim 1 , an undercoat coating step of applying an undercoat to the surface of the base material is provided before the coating composition is applied.

The metal mirror surface forming coating method according to claim 3 is characterized in that, in claim 1 or 2 , a top coat coating step of applying a top coat to the surface of the formed metal particle layer is provided.

The metal mirror surface forming coating method according to claim 1 can smoothly attach flat, flat or spherical metal particles to the surface of a base material, and clearly reflects the appearance of a person or an image of an object. It has the effect of being able to create a mirror surface that can be used.

In addition, in order to form a mirror-finished metal particle layer on the surface of the base material, pickling equipment, electroplating liquid tank, heating equipment and ultrasonic equipment are generally installed in a special building dedicated to plating. In contrast to the fact that vacuum deposition requires a vacuum device and a heating device, the metal mirror surface forming coating method of the present invention requires a pickling facility or an electroplating solution. It is possible to form a mirror-surfaced metal particle layer at room temperature in a place where a tank is not installed, and in a non-vacuum working environment, that is, a general working environment, which is not a clean room, and has the effect of requiring almost no power cost.

In addition, since the work is performed in a non-vacuum work environment rather than in a clean room, dust in the air adheres to the surface of the base material, but in that case, the film thickness of the formed metal particle layer is thin, so that it can be visually recognized. In addition, it has the effect that dust of a size that can be visually recognized by the reflection of light does not adhere. Even if small dust adheres, it has the effect of having almost no effect on the image as a mirror surface.

Further, the shape of the base material may be a planar shape having any shape such as a flat shape or a curved shape. For example, when the base material is used as a door handle of an automobile as an example, in the case of vacuum deposition or plating, an automatic slanted door However, in the case of the present invention, it is possible to carry out the operation with the door handle attached to the automobile, which has a remarkable effect.

Further, when the base material is, for example, transparent glass as a material that allows sunlight to pass through, the metal mirror surface forming coating method of the present invention is applied to the glass surface to provide a heat-shielding effect while maintaining transparency. When the dark side is viewed through the glass subjected to the metal mirror surface forming coating method from the bright side, the dark side becomes difficult to see due to the reflection of light, but conversely, through the glass subjected to the metal mirror surface forming coating method from the dark side. When the bright side is viewed, the effect is that the metal mirror surface forming coating method can be seen at almost the same level as before the implementation.

Further, after the metal particles contained in the coating composition are pressed and adhered to the surface of the base material, the metal particles are fixed to the surface of the base material and prevented from peeling off. Play.

The metal mirror surface forming coating method according to claim 2 has an effect of improving adhesion by undercoating the surface of a base material.

The metal mirror surface forming coating method according to claim 3 has an effect that a high mirror surface state capable of reflecting a person's appearance or an image of an object can be maintained for a long period of time.

It is a figure which shows the process flow of the metal mirror surface formation coating method of this invention. It is a figure which shows the flow of the procedure of the process of forming a two-layer metal particle layer. It is a figure which shows the flow of the procedure of the metal particle layer forming process of one layer. It is a figure which shows the coating composition of the metal particle layer forming process, and the state of use of a rotary polisher. It is a figure which shows the coating composition of the metal particle layer forming process, and the state of use of a rotary polisher. It is a perspective view which shows an example of a base material. It is a side view which shows the state which formed the metal particle layer on the surface of a base material. When the metal particles are flat or flat, the first layer is an explanatory diagram of the metal particle layer forming step, (a) is a diagram in which a coating material is applied to the surface of the base material, and (b) is a rotary polisher. It is a figure in which the pressing work and the spreading work are performed, and (c) is an explanatory view of the state in which the first metal particle layer is formed. When the metal particles are flat or flat, the second layer is an explanatory view of the metal particle layer forming step, (a) is a view in which a coating material is applied to the surface of the base material, and (b) is a rotary polisher. It is a figure to perform the pressing work and the spreading work, and (c) is the explanatory view of the state in which the second metal particle layer is formed. When the metal particles are flat or flat, the third layer is an explanatory view of the metal particle layer forming step, (a) is a view in which a coating material is applied to the surface of the base material, and (b) is a rotary polisher. It is a figure to perform the pressing work and the spreading work, and (c) is the explanatory view of the state in which the third metal particle layer is formed. It is explanatory drawing of the side surface which shows the state which the metal particle layer was formed when the metal particle has a spherical shape. It is explanatory drawing of the example of the type of buff of a polisher, (a) is a figure which shows the case where the buff shape is a disk shape, and (b) is the figure which shows the case where the buff shape is a conical shape. It is a photograph comparing the effect of the reflection condition as a mirror of the Example and the Comparative Example on the material of the painted surface of the automobile part, the photograph on the left side is the Comparative Example, and the right side is the Example.

The metal mirror surface forming coating method 1 of the present invention is, for example, a method of forming a metal layer 50 on the surface of a base material 8 as shown in FIG. 6, for example, in a pickling facility such as a plating factory, an electroplating liquid tank, or the like. A metal layer can be formed on the surface of the base material 8 at room temperature in a general work space without requiring installation and a closed vacuum space.

The metal mirror surface forming coating method 1 of the present invention includes a metal particle layer forming step 3. As shown in FIG. 1, the undercoat coating step 2, the metal particle layer forming step 3, and the topcoat coating step 4 may be provided. Further, the combination of the undercoat coating step 2 and the metal particle layer forming step 3 may be used, or the combination of the metal particle layer forming step 3 and the topcoat coating step 4 may be used.

In the metal mirror surface forming coating method 1 of the present invention, a coating composition 7 containing flat, flat or spherical metal particles 9 is applied to or while being applied to the surface of the base material 8 on the surface. By moving the buff 6 while performing spreading work and pressing work with the buff 6 on the coating composition 7, the metal particles 9 are attached onto the surface to form a metal layer 50. The particle layer forming step 3 is provided.

The base material 8 has a form such as a flat surface or a curved surface as shown in FIG. 6, and its surface state may be uneven or smooth. In any case, any form or surface state may be used as long as it is possible to simultaneously perform the spreading work and the pressing P work on the surface of the base material 8 by the buff 6. The material of the base material 8 may be any material that can form a metal layer 50 on the surface, and the surface state of the material 8 may be not only the material but also coating, plating, resin, or the like.

Examples of the base material 8 include a painted surface of an automobile (rearview mirror part, door handle, tire arch part of front fender, tire arch part of rear fender, door, etc.), a door handle of a building, a handle of a sliding door, and an ornament. It may be a flat or curved part made of metal or resin, such as a flat or curved metal / resin part, a flat / curved surface of personal belongings, a metal / resin part, or the like. In any case, for example, when the base material 8 is the painted surface portion of the side mirror of the automobile, the metal mirror surface of the present invention is mounted on the automobile as it is without removing the painted surface portion of the side mirror serving as the base material 8. The forming coating method 1 can be carried out.

The metal particles 9 may be metal particles, but preferably at least one or more of nickel, copper, silver, gold, chromium, cobalt, zinc, aluminum, iron, titanium, rhodium, palladium, and platinum. The metal particle 9 containing an element corresponds to this. The thickness, size and shape of the metal particles 9 are such that the thickness is 100 nm or less, preferably the thickness is 50 nm or less, more preferably the thickness is 30 nm or less, and the size is 0.01 μm to 100 μm in the primary particle diameter. It is preferably flat, flat or spherical with a primary particle diameter of 0.5 μm to 30 μm, more preferably a primary particle diameter of 1 μm to 15 μm. Further, the metal particles 9 include particles in which resin or glass particles are coated with metal, particles in which metal is coated with resin or silica, or particles colored therein.

The coating composition 7 contains the metal particles 9, and contains an adhesive composition for the purpose of adhering the metal particles 9 to the base material 8. The adhesive composition may be in a state of being dissolved in the coating composition 7 or in a granular state. The coating composition 7 contains 5 to 70% by weight of the metal particles 9, 2 to 20% by weight of the adhesive composition, and 10 to 93% by weight of a petroleum-based solvent, an alcohol-based solvent or water.

The adhesive composition contains at least one or more materials among epoxy resin, urethane resin, acrylic resin, polyester resin, melamine resin, silicone resin, alkyd resin, and fluororesin.

To simultaneously perform the spreading work and the pressing work by the buff 6 on the coating composition 7 on the surface applied to the surface of the base material 8, as shown in FIG. 4, the surface of the base material 8 is covered. The coating composition 7 is applied, and the buff 6 is pressed against the coating composition 7 applied to the surface of the base material 8 by pressing P to add spreading by rotation R or reciprocation (not shown). Say. In this case, after the coating composition 7 is applied to the surface of the base material 8, the buff 6 is used to spread and press the surface of the base material 8.

As shown in FIG. 5, the coating of the buff 6 is coated with the coating composition 7 on the surface of the base material 8 while simultaneously performing the spreading work and the pressing work with the buff 6. The composition 7 is applied, and the buff 6 to which the coating composition 7 is attached is pressed against the surface of the base material 9 by pressing P, and the coating composition 7 is applied to the surface of the base material 9 by the buff 6 while rotating. It means adding R or reciprocating (not shown) spread. In this case, after the coating composition 7 is applied to the surface of the buff 6, the buff 6 is used to spread and press the surface of the base material 8.

The instruments used to simultaneously perform the spreading work and pressing work of the buff 6 include a rotary polisher to which a disk-shaped buff can be attached, a rotary drill driver to which a cylindrical or conical buff can be attached, and a flat surface. There are vibration tools such as an orbital sander that reciprocates to which a mold buff can be attached, for example, the pad swings back and forth and left and right, and a reciprocating linear motion sander that reciprocates the pad back and forth.

The rotary polisher 5 corresponds to a double action polisher, a gear action polisher, or a single action polisher, but any other device as long as it is a tool to which a buff 6 can be attached and rotation R and pressure P can be applied. It may be a tool.

The rotation R is preferably 200 to 16000 rpm, preferably 1000 to 10000 rpm, and more preferably 2000 to 8000 rpm. The pressing P is 8.0 to 2500 kg / m ² , preferably 50 to 500 kg / m ² , and more preferably 100 to 300 kg / m ² . The reciprocating speed is preferably the same as the rotation speed. The number of reciprocating movements is preferably 100 to 10000 times / minute, preferably 500 to 8000 times / minute, and more preferably 1000 to 3000 times / minute.

The buff 6 corresponds to a urethane buff 6, a wool felt buff 6, or a cotton buff 6. The buff 6 has a disc shape capable of having a hard plate 62 on the back surface as shown in FIG. 12 (a), or a rotating shaft having a hard central portion as shown in FIG. 12 (b). A conical shape or a cylindrical shape (not shown) capable of providing 61 is applicable, but any shape may be used as long as the surface side of the buff 6 can be pressed against the base material 8.

When the buff 6 has a disc shape as shown in FIG. 12 (a), it is suitable when the surface shape of the base material 8 has a surface shape, and it has a conical shape as shown in FIG. 12 (b). In this case, it is suitable when the space where the buff is used such as the inner wall surface of the hole or the slit portion is narrow, and since it has a conical shape, it is possible to apply pressure and spread from a portion having a narrow slit width to a portion having a relatively wide slit width.

Next, the undercoat application step 2 will be described. The undercoat is used for the purpose of improving the adhesion to the surface of the base material 8 as a preparation for applying the coating composition 7 on the surface of the base material 8, and is applied to the surface of the base material 8. To do.

Next, the metal particle layer forming step 3 will be described. The metal particle layer forming step 3 is a step of forming the metal layer 50 on the surface of the base material 8. The metal layer 50 may be one layer, two layers, three layers, or any number of layers.

First, the procedure 10 for the first layer of the metal layer will be described. As shown in FIG. 2 or 3, first, as the procedure 11a, as shown in FIG. 8A, the coating composition 7 containing the metal particles 9 and the adhesive composition is applied to the surface of the base material 8.

In the step 11a, the coating composition 7 may be applied to the surface of the buff 6 as the step 11b as shown in FIG. In FIG. 5, the coating composition 7 is not applied to the surface of the base material 8 where the buff 6 is not in contact, and the coating composition 7 is applied to the buff 6. Either procedure may be used as long as the coating composition 7 is interposed between the surface of the base material 8 and the buff 6 in both steps 11a and 11b.

Next, as a procedure 12, as shown in FIG. 8B, the polisher 5 simultaneously applies the spreading of the rotation R or the reciprocating motion and the pressing P. Pressing P is applied so that the coating composition 7 is attached to the surface of the base material 8 while rotating R or reciprocating the polisher 5.

Next, as step 13, the polisher 5 rotates R or reciprocates (not shown) and presses P so that the metal particles 9 are uniformly attached to the entire surface of the base material 8 on which the metal layer 50 is to be formed. Move while adding at the same time. When this procedure 13 is repeated, the metal particles 9 are attached to the surface of the base material 8, the volatile components of the components of the coating composition 7 evaporate, and the solvent is volatilized by the force of pressing and spreading. The metal particles 9 can be fixed to the surface of the base material 8 by the adhesive composition. Next, as a procedure 14, as shown in FIG. 8C, the first layer 51 of the metal layer 50 in which the layer of the metal particles 9 is formed on the surface of the base material 8 is completed.

In the state of the first layer, as shown in FIG. 8C, the metal particles 9 are attached to the first layer 51 of the metal layer 50 over almost the entire area, but the metal particles 9 are attached to the first layer 51, although it is a part. There is a range that is not. Therefore, the first layer 51 alone has a gloss and a mirror finish range can be obtained, but in order to form the metal layer 50 over the entire surface of the base material 8, the second layer 52 and the third layer 53 are further formed.

Next, the second layer procedure 20 of the metal layer 50 will be described. The second layer procedure 20 repeats the same procedure as the first layer procedure 10. As shown in FIG. 9A, as step 11, the coating composition 7 is applied to the surface of the first layer 51. Next, as a procedure 12, as shown in FIG. 9B, the polisher 5 simultaneously applies the spreading of the rotation R or the reciprocating motion (not shown) and the pressing P. Pressing P is applied so that the coating composition 7 is attached to the surface of the first layer 51 while rotating R or reciprocating the polisher 5.

Next, as step 13, while simultaneously applying rotation R or reciprocating motion (not shown) and pressing P with a polisher 5 so that the coating composition 7 is uniformly attached to the entire surface of the first layer 51. Move. Next, as a procedure 14, as shown in FIG. 9C, the second layer 52 of the metal layer 50 in which the layer of the metal particles 9 is formed on the surface of the first layer 51 is completed.

Next, the procedure for the third layer of the metal layer 50 will be described. In the third layer procedure, the same procedure as in the first layer procedure 10 is repeated. As shown in FIG. 10A, the coating composition 7 is applied to the surface of the second layer 52 as the procedure 11. Next, as a procedure 12, as shown in FIG. 10B, the polisher 5 simultaneously applies the spreading of the rotation R or the reciprocating motion and the pressing P. Pressing P is applied so that the coating composition 7 is attached to the surface of the base material 8 while rotating R or reciprocating the polisher 5.

Next, as step 13, while simultaneously applying rotation R or reciprocating motion (not shown) and pressing P with a polisher 5 so that the coating composition 7 is uniformly attached to the entire surface of the second layer 52. Move. Next, as a procedure 14, as shown in FIG. 10C or FIG. 7, the third layer 53 of the metal layer 50 in which the layer of the metal particles 9 is formed on the surface of the second layer 52 is completed.

Further, the fourth layer and the fifth layer may be laminated. The number of layers to be laminated may be arbitrarily set from the thickness and gloss of the metal layer 50. Since the metal particles 9 are thickly attached to the surface of the base material 8 as the number of layers is increased, a mirror surface that creates a high mirror surface state that can reflect the appearance of a person or an image of an object can be formed.

In the state where the metal particles 9 are attached to the surface of the base material 8, for example, when the metal particles 9 are spherical, the spherical metal particles 9 are attached to the surface of the base material 8 as shown in FIG. Further, for example, when the metal particles 9 are flat or flat, the flat or flat metal particles 9 are attached to the surface of the base material 8 as shown in FIG. 10 (c). A mirror surface can be created by sticking in this way.

Next, after the metal particle layer forming step 3, a top coat coating step 4 for applying the top coat is provided. A transparent coating composition is used as the coating composition. It is preferable to carry out when the mirror surface is maintained for a long period of time.

A human face was hardly reflected on the base material 8 before the implementation of the metal mirror surface forming coating method 1 of the present invention, but the metal layer on the surface of the base material 8 after the implementation of the metal mirror surface forming coating method 1 of the present invention. The 50 can be projected at the same level as a human face reflected in a mirror.

Next, an example will be shown. The present invention is not limited to the examples.

As Example U, silver particles as metal particles 9 were contained on the surface of an automobile coating plate (length 200 mm, width 100 mm, thickness 0.8 mm) as a base material 8, and a silicone resin was contained as an adhesive composition. The coating composition 7 is applied to the buff surface of a double action polisher equipped with a circular tapered urethane buff as the buff 6, and the coating composition 7 is applied to the surface of the automobile coating plate which is the base material 8. Pressing and spreading were applied until the solvent was almost evaporated to form the metal layer 50. As shown in Example U of FIG. 13, the surface state of the metal layer 50 clearly shows that both the letters M1 and the apple R1 of "Example" are clearly reflected on the mirror surface.

As Comparative Example H, the buff surface of a double action polisher in which a circular tapered urethane buff with an abrasive as a buff 6 is attached to the surface of an automobile coating plate (length 200 mm, width 100 mm, thickness 0.8 mm) which is a base material 8. To form a smooth surface by applying pressure and polishing to the surface of the automobile coated plate which is the base material 8. As shown in Comparative Example H of FIG. 13, the surface condition of the smooth surface suggests that both the letters M2 and the apple R2 of "Example" are slightly reflected on the smooth surface.

Therefore, in Example U in which the metal particle layer 50 is formed on the automobile coating plate which is the same base material 8 by the metal mirror surface forming coating method 1 of the present invention, the automobile coating plate which is the same base material 8 is polished with an abrasive. Compared with Comparative Example H in which a smooth surface was formed, a remarkable advantageous effect was obtained at the reflection level of the mirror surface.

1 Metal mirror surface forming coating method 2 Undercoat coating step 3 Metal particle layer forming step 4 Top coat coating step 5 Polisher 6 Buff 7 Coating composition 8 Base material 9 Metal particles 10 1st layer Procedure 11a Procedure 11b Procedure 12 Procedure 13 Procedure 14 Step 20 2nd layer Step 50 Metal particle layer 51 1st layer 52 2nd layer 53 3rd layer 61 Rotating shaft 62 Hard plate P Pressing R Rotation

Claims (3)

A coating composition containing flat, flat or spherical metal particles and an adhesive composition for adhering the metal particles to a base material and containing no abrasive is applied to the surface of the base material. The metal particles are spread on the surface by moving the buff while performing spreading work and pressing work with the buff on the coating composition on the surface. A metal mirror surface forming coating method comprising a metal particle layer forming step of pasting to form a metal layer and forming a mirror surface in which the surface of the metal layer is reflected at the same level as reflected in a mirror. Before the coating composition is applied, a metal mirror surface forming coating method according to claim 1, characterized in that a undercoat coating step of applying the undercoat on the surface of the substrate. The metal mirror surface forming coating method according to claim 1 or 2 , wherein a top coat applying step of applying a top coat is provided on the surface of the formed metal layer.