JP2007144376A - Coating method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a coating method easy to remove a masking material. <P>SOLUTION: This coating method comprises processes for: coating a coating object with the masking material; disposing the masking member on a surface of the masking material; coating the coating object; and removing the masking member and washing with a solvent to remove the masking material. This coating method easily performs removal of the the masking material. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a coating method for coating a material to be coated, and more particularly to a coating method for coating a surface that should not be painted with a masking material.

  When various objects such as automobiles are painted, masking tape or masking material is attached to the surface that should not be painted, and the masking is removed after painting. As a result, the paint does not adhere to portions that should not be painted, and a desired surface can be obtained.

  For removing the masking, there is a method of washing the object to be coated with a solvent. Such a coating method is disclosed in Patent Documents 1 and 2, for example.

  Patent Document 1 discloses a masking material that uses a thermoplastic resin as a material and has a solvent-resistant film made of a water-soluble resin on the surface. Here, the solvent resistance of the solvent-resistant coating is a solvent that constitutes a paint applied to an object to be coated.

  Patent Document 2 discloses a masking tape having a water-soluble or water-dispersible base material and a water-soluble or water-dispersible adhesive layer.

  Since the masking tape and the masking material disclosed in Patent Documents 1 and 2 are made of a water-soluble substance, they can be removed from the surface of the object to be coated by washing with water.

However, the coating method using a masking material has a problem that it becomes difficult to remove the masking material when a paint is applied to the entire surface of the masking material to form a coating film. Specifically, the material of the masking material is selected such that it is washed away with a solvent that does not dissolve the paint applied to the object. The paint is insoluble in the solvent that removes the masking material. For this reason, when a coating film of paint is formed on the entire surface of the masking material, the masking material is covered with the coating film and cannot be brought into contact with the solvent, making it difficult to remove the masking material with the solvent.
JP 2002-361134 A Japanese Patent Laid-Open No. 10-60395

  This invention is made | formed in view of the said actual condition, and makes it a subject to provide the coating method which can remove a masking material easily.

  In order to solve the above-mentioned problems, the present inventors have studied the method of applying a paint in a state where a masking material is arranged, and as a result, have come to make the present invention.

  The coating method of the present invention includes a step of coating a surface of an object to be painted with a masking material, and a step of disposing a masking member that covers at least a part of the surface of the masking material on the surface of the masking material. The process of coating the object to be coated and the solvent applied to the object to be coated are in a state in which the fluidity has disappeared and the masking member has been removed. And a step of removing the masking material by washing with.

  The coating method of the present invention forms the surface of the masking material to which the paint does not adhere by performing coating in a state where the masking member is arranged on the surface of the masking material. Then, the removal of the masking material proceeds with the solvent from the surface of the masking material to which the paint does not adhere. That is, the coating method of the present invention is a coating method that can easily remove the masking material.

  In the coating method of the present invention, first, the surface of the article to be coated that is not to be coated is covered with a masking material. Thereby, the surface which should not be painted is coat | covered with a masking material, and the surface which should not be painted is not exposed. As a result, when the paint is applied to the object to be coated in the subsequent process, the paint does not adhere to the surface that should not be applied.

  In the coating method of the present invention, a masking member that covers at least a part of the surface of the masking material is then disposed on the surface of the masking material. By disposing the masking member on the surface of the masking material covering the surface of the object to be coated, the portion of the masking material on which the masking member is disposed is not exposed. Thereby, in a subsequent process, when the paint is applied to the object to be coated, the paint does not adhere to at least the surface of the masking material where the masking member is disposed.

  Then, the object to be painted is painted. By coating the object to be coated, a desired coating film can be formed on the surface of the object to be coated. In the present invention, the material and the coating method of the paint used for painting the object to be coated are not particularly limited. For example, a synthetic resin enamel paint can be used as the paint. Examples of the coating method include brush coating, roller coating, and spray coating, and spray coating is preferable.

  After that, the paint applied to the object to be coated is in a state in which the fluidity has disappeared and the masking member is removed. The masking material is removed by washing with a solvent in which the paint is insoluble and the masking material is soluble. . Since the paint applied to the object to be coated loses its fluidity, the paint does not flow on the surface of the object to be coated even if the masking material is removed. In a state where the fluidity of the paint has disappeared and the masking member has been removed, the surface of the masking material covered with the masking member is newly exposed. The paint is not adhered to the newly exposed surface of the masking material due to the presence of the masking member. When the object to be coated is washed with a solvent, the masking material is dissolved (or dispersed) in the solvent at least from the surface where the coating material of the masking material is not attached, and the masking material can be removed from the surface of the object to be coated. When the masking material can be removed from the surface of the object to be coated, the coating film of the paint adhering to the surface of the masking material is also removed from the surface of the object to be coated. Here, if even part of the masking material can be removed, the masking material dissolves the masking material by impregnating the masked material with the solvent along the surface of the object to be coated from the removed part. And the coating film can be removed.

  The solvent for removing the masking material is a solution in which the paint is insoluble and the masking material can be dissolved. When washed with this solvent, the soluble (or dispersible) masking material dissolves (or disperses) in the solvent, and the coating film does not dissolve in the solvent. For this reason, only the masking material can be removed from the surface of the object to be coated, and as a result, the coating film on the surface of the masking material can be removed.

  In the coating method of the present invention, the masking material and the solvent material are not particularly limited. That is, it can be appropriately selected depending on the object to be coated and the material of the paint to be coated on the object. Further, the form of the masking material may be a form of a masking tape having a base material and an adhesive layer, or a form in which a solution-like composition is applied to an object to be coated.

  The masking material preferably has a film formed by applying a solution-like composition to an object to be coated. When the masking material has a film formed of a solution-like composition, at least the film covers the surface of the object to be painted that is not to be painted, and the paint is prevented from adhering to the object to be painted.

  The masking material preferably has a water-soluble film. Since the water-soluble film dissolves in water, water that is inexpensive and easy to handle can be used as the solvent. At this time, an additive may be appropriately added to the water constituting the solvent while maintaining the performance capable of dissolving the masking material. A conventionally well-known masking material can be used if a masking material has a water-soluble film. For example, commercially available liquid paste, water-soluble masking tape, and starch paste can be mentioned. And it is preferable that a solvent consists of a solution which has water as a main component.

  Further, the cleaning method for removing the masking material from the surface of the object to be coated is not particularly limited. For example, a method of immersing the masking material in a solvent and dissolving it in the solvent, a method of spraying the solvent with a spray gun or the like to dissolve the masking material while removing it with the pressure of the masking material itself, and a state in which the masking material is impregnated with the masking material A method of wiping the masking material with a sponge or the like can be given.

When the masking material is removed by spraying the solvent, the pressure for spraying the solvent differs depending on the object to be coated, the masking material, the material of the solvent, etc., and thus cannot be determined in general, but 2.0 MPa (20.4 kgf / cm ² ) It is preferable to spray the solvent at the above pressure. When the solvent is sprayed, stress is applied to the masking material when the solvent itself hits the masking material, and the masking material is peeled off in a short time by this pressure. When the pressure of the solvent to be sprayed is less than 2.0 MPa (20.4 Kgf / cm ² ), the spraying effect is not exhibited. Moreover, when the pressure of the sprayed solvent becomes excessively high, the surface of the object to be coated is damaged by the pressure of the solvent. More preferably, the solvent is sprayed at a pressure of 2.0 to 10.0 MPa (20.4 to 102.0 Kgf / cm ² ). In the present invention, the solvent spray pressure may be a set value of the pressure of the high-pressure washing machine.

  In the present invention, the material of the masking member disposed on the surface of the masking material is particularly limited as long as it is formed on the surface of the masking material during painting and can be detached from the surface of the masking material thereafter. It is not a thing.

  It is preferable that the masking member is formed so that the opposing surface thereof matches the outer peripheral surface shape of the object to be coated. The facing surface of the masking member is a surface that faces the masking material (surface of the object to be coated) when placed on the surface of the masking material. The opposing surface is formed so as to match the shape of the outer peripheral surface of the object to be coated, so that when the masking member is placed on the surface of the masking material, the masking member and the masking material (object to be coated) are in close contact with each other. , There will be no gap between them. When no gap occurs, the paint does not enter between the two during coating, and a clean surface of the masking material can be secured. In particular, when the coating is sprayed on the surface of the object to be coated in the form of a mist, the mist of the coating also enters a gap of several μm. For this reason, it is preferable to form the opposing surface of a masking member so that the clearance between a masking member and a masking material (object to be coated) does not occur. The masking member is preferably a member having an opposing surface formed by electroforming or vacuum forming.

  The masking member preferably covers the entire surface covered with the masking material. When the masking member covers the entire surface of the masking material, no paint film is formed on the surface of the masking material, and the masking material can be easily removed by washing.

  The masking material is preferably colored in a desired color. By coloring the masking material in a desired color, the removal of the masking material can be visually confirmed when the masking material is removed. Here, the desired color of the masking material can be appropriately selected from the colors of the object to be coated and the paint applied to the object to be coated. As the colored masking material, for example, a masking material containing or dispersing food coloring such as ink and red food can be used.

  Hereinafter, the coating method of this invention is demonstrated using an Example.

(Example)
As an example of the present invention, the automobile front grill was painted.

  First, a base material 1 was formed by molding a resin (specifically, ABS) into the shape of a front grille. And the plating process was given to the predetermined position of the base material 1, and the plating layer 2 was formed.

  Subsequently, the surface of the plating layer 2 was covered with the masking material 3. The masking material 3 was formed by applying commercially available liquid glue (trade name: Asahi glue P, manufactured by Asahi Crystal Brain Co., Ltd.) with a roller and drying. Thereby, the plating layer 2 was formed on the surface of the base material 1, and the entire surface of the plating layer 2 was covered with the masking material 3.

  And the masking member 4 manufactured beforehand was arrange | positioned in the state closely_contact | adhered on the surface of the masking material 3. FIG. Here, the masking member 4 is a member having a facing surface manufactured by reversing the surface plated by electroforming so that the facing surface 40 facing the substrate 1 matches the outer peripheral shape of the surface of the plating layer 2. It is.

  With the masking member 4 placed on the surface of the masking material 3, the paint was applied to the surface of the substrate 1 using the spray gun 5. The paint is a primer (manufactured by Shinto Paint Co., Ltd., trade name: Shinto 35U Primer), a paint containing a pigment such as metallic or mica (manufactured by Nippon Bee Chemical Co., Ltd., trade name: R160), clear coat (Kansai Paint) Product name: Soflex 900) manufactured in this order. The appearance during painting is shown in FIG.

  Then, the masking member 4 was removed and the paint was dried.

The surface of the substrate 1 covered with the masking material 3 is sprayed with water at a pressure of 7.0 MPa (71.4 Kgf / cm ² ) using a high-pressure washing machine, and the masking material 3 is removed using the water pressure of the sprayed water. It was. Then, air was blown with an air blower to blow off water droplets and dried.

  By the above procedure, the automobile front grill of the present example was painted.

  In the above-described painting on the front grille for automobiles, when the masking member is removed after the coating material is applied in a state where the masking member is disposed, a slight amount of paint mist particles adhere to the surface of the masking material. This mist has entered from a gap formed between the front grille for automobile and the masking member. This gap is generated due to product variations in the manufacturing process in an automobile front grill, which is a large resin molded product, and is a gap of about several μm. However, the mist of the paint adhering to the surface of the masking material was small, and the surface of the masking material itself was present over a large area. When water was sprayed onto the masking material with a high pressure washer, the masking material dissolved in the water and the masking material could be easily removed by the water pressure.

  In addition, by painting using a masking material, the front grille for automobiles after painting could clearly confirm the boundary (parting) between the plated surface and the painted surface. Further, in the automobile front grill after painting, no paint was observed on the plated surface. That is, the coating method of the embodiment is a coating method that can form a desired painted surface and can easily remove the masking material.

  In the examples, the gap in which the mist entered was generated in the manufacturing process of the resin molded product, but the gap was generated because the masking member and the masking material (substrate (substrate)) could not be completely adhered. It may be.

It is sectional drawing which showed the mode at the time of the coating of the front grille for motor vehicles of an Example.

Explanation of symbols

1: Base material 2: Plating layer 3: Masking material 4: Masking member 5: Spray gun

Claims (6)

Coating the surface of the article to be painted with a masking material;
Disposing a masking member covering at least a part of the surface of the masking material on the surface of the masking material;
A step of coating the object to be coated;
The coating material applied to the object to be coated is in a state where the fluidity has been lost and the masking member is removed, and the coating material is insoluble and the masking material is washed with a solvent that can dissolve the masking material. The process of removing
The coating method characterized by having.   The coating method according to claim 1, wherein the masking material has a water-soluble film.   The coating method according to claim 2, wherein the solvent is a solution containing water as a main component.   The said masking member is a coating method of Claim 1 formed so that the opposing surface might correspond with the outer peripheral surface shape of the said to-be-coated object.   The coating method according to claim 1, wherein the masking member covers the entire surface covered with the masking material. The coating method according to claim 1, wherein spray coating is performed.

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