JP2018126724A - Fluorine coating method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for improvement of adhesion when a fluorine resin-based paint is used for finish coating.SOLUTION: According to this coating method, a surface 1A of a base material 1 is previously treated and is coated with a water-based primer (main component: epoxy modified acrylic resin emulsion or the like) or a solvent-based primer (main component: epoxy modified acrylic resin system or the like) by a roller, a brush, an air spray and so on thereby forming an undercoat layer 2, and thereafter, an aqueous acrylic resin-based paint is diluted with an aqueous sealer which contains one of an acrylic resin-based emulsion, an epoxy resin-based emulsion, and an acrylic resin varnish as a main component, and is coated onto the undercoat layer 2 by the roller or the like thereby performing intermediate coating, and then, is dried during 20 to 24 hours thereby forming an intermediate coat layer 3. Finally, an aqueous fluorine resin-based paint is diluted with fresh water and is stirred, and then, is coated onto the intermediate coat layer 3 by the roller or the like thereby performing finish coating to form a top coat layer 4.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a fluorine coating method, and more particularly to a fluorine coating method suitable for applying a fluorine resin paint on a substrate.

Surfaces of building mortar walls, concrete walls, ALC panels, siding, tiles, steel, and steel structures such as bridges are painted to prevent cracking, oxidization, rust, etc. caused by solar radiation, wind and rain, etc. And protect. Even after painting, the coating film deteriorates due to solar radiation, wind and rain, etc., so that repair painting is regularly applied at intervals of about 5 to 10 years. There are various types of coating materials having different chemical components. Among them, fluororesin-based paints are excellent in weather resistance and are gradually becoming widespread although they are expensive.
By the way, although the adhesion (coating property) between the coating film and the substrate side is important for the coating quality, it takes many years to evaluate, so the coating is suitable for undercoating when a fluororesin paint is used for the top coating. There is currently no progress in research on materials, and there is currently a mechanical application of the type of primer specified by the owner.

  The present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is to provide a fluorine coating method capable of improving the adhesion when a fluororesin-based paint is used for overcoating.

In the first aspect of the invention, when the fluororesin-based paint is overcoated on the substrate to be coated, an aqueous acrylic resin-based paint diluted with an aqueous sealer is applied below the fluororesin-based paint. It is characterized by that.
In the invention according to claim 2, in the coating method in which the base material to be coated is undercoated and intermediately coated and then overcoated with a fluororesin-based coating, the intermediate coating is applied with an aqueous acrylic resin-based coating diluted with an aqueous sealer. It is characterized by having done by doing.
In the invention according to claim 3, the aqueous sealer is a synthetic resin sealer,
It is characterized by.
The invention according to claim 4 is characterized in that the aqueous sealer is mainly composed of one of an acrylic resin emulsion, an epoxy resin emulsion and an acrylic resin varnish.

  According to the present invention, the water-based acrylic resin-based paint film diluted with the water-based sealer firmly adheres the base material side to the fluororesin-based paint film, so that the excellent weather resistance of the fluororesin-based paint can be maintained for a long time. Can be maintained over time. Further, it is possible to prevent the overcoated fluororesin-based paint from being sucked into the base material and thinning the film.

It is explanatory drawing of the fluorine coating construction method which concerns on one Example of this invention (Example 1).

  Hereinafter, the best mode of the present invention will be described based on examples.

FIG. 1 is an explanatory view of a fluorine coating method according to an embodiment of the present invention.
In this embodiment, a case where an undercoat and an intermediate coat are applied to a substrate and then an overcoat is applied with a fluororesin-based paint is taken as an example.
1 (1) to (4), reference numeral 1 denotes a base material to be painted, such as a building, a mortar wall of a steel structure, a concrete wall, an ALC panel, a siding, a tile, or a steel material.
As preparation for coating, deposits such as dust, dirt and cement powder on the surface 1A of the substrate 1 are removed with a wire brush, sandpaper, waste cloth, etc., dried, and then subjected to a ground treatment (see FIG. 1 (1)). .
First, an aqueous primer (for example, Kikusui (Registered Trademark) Primer Super E manufactured by Kikusui Chemical Co., Ltd., the main component is an epoxy-modified acrylic resin emulsion) is diluted with clean water, and a roller or brush is applied to the surface 1A of the substrate 1. Apply with air spray, etc., or dilute a solvent-based primer (for example, Kikusui Primer SS manufactured by Kikusui Chemical Co., Ltd., the main component is an epoxy-modified acrylic resin) with paint thinner to make the surface 1A of the substrate 1 It is applied with a roller or the like, undercoated, and dried for about 20 to 24 hours to form an undercoat layer 2 (see FIG. 1 (2)). The undercoating is performed to improve the adhesion between the intermediate coating layer (see reference numeral 3) described below and the substrate 1.

  Next, water-based acrylic resin-based paint (for example, Silvia (registered trademark) WA-100 manufactured by Nippon Special Paint Co., Ltd., Asuka II manufactured by Kansai Paint Co., Ltd. (registered trademark)) is a synthetic resin-based aqueous sealer. It is diluted and applied onto the undercoat layer 2 with a roller, brush, air spray, or the like to make an intermediate coat, and dried for about 20 to 24 hours to form the intermediate coat layer 3 (see FIG. 1 (3)). In this case, 16 kg of the main component of the aqueous acrylic resin-based paint is diluted at a ratio of 1 to 1.5 liters of aqueous sealer and stirred for about 6 to 8 minutes.

For water-based sealers, synthetic resin sealers (JIS) with one of acrylic resin emulsion, epoxy resin emulsion, acrylic resin varnish, etc. as the main component
K 5663) can be used. Specific examples include Eco-cation sealer (main component: cationic acrylic silicone resin emulsion) manufactured by Kansai Paint Co., Ltd., Primer Super E (main component: epoxy-modified acrylic resin emulsion) manufactured by Kikusui Chemical Co., Ltd., Dainippon Paint Co., Ltd. There is a company (registered trademark) water-based mighty sealer multi (main component: specially modified acrylic resin varnish), other water-based sealers manufactured by Asahi Pen Co., Ltd. A synthetic resin sealer containing as a main component can be used.

  Here, the water-based acrylic resin-based paint is usually used after being diluted with clean water. However, the present inventor has diluted the coating with the coating film of the fluororesin-based paint used for the top coating by diluting with an aqueous sealer instead of fresh water. It has been found that the degree of adhesion with the material side is remarkably improved. Moreover, it discovered that the coating film of a fluororesin-type coating material was suppressed inhaling into a base material, and the film thickness reduction after coating could be prevented.

  Finally, a water-based fluororesin-based paint (for example, Keys (registered trademark) water-based fluorine ace manufactured by Kikusui Chemical Co., Ltd.) is diluted at a ratio of 0 to 1.5 liters of fresh water with respect to 15 kg of the main ingredient, and is about 6 to 8 minutes. After stirring, the overcoat layer 4 is formed on the intermediate coat layer 3 by applying it with a roller, a brush, an air spray, or the like. Alternatively, a solvent-based fluororesin-based paint (for example, Keys Super Power Fluorine, manufactured by Kikusui Chemical Co., Ltd.) is used at a ratio of 0.8 to 1.6 torr of paint thinner with respect to 13.5 kg of the main agent and 1.5 kg of the curing agent. Then, the mixture is stirred for about 6 to 8 minutes, and then applied onto the intermediate coating layer 3 with a roller or the like for overcoating to form the overcoating layer 4.

  According to this embodiment, after forming an undercoat layer 2 and an intermediate coat layer 3 in order from the bottom on a base material 1 such as a mortar wall, concrete wall, ALC panel, siding, tile, steel material to be coated, fluorine By forming the intermediate coating layer 2 under the fluororesin-based paint by diluting the water-based acrylic resin-based paint with an aqueous sealer instead of fresh water when performing the fluorine coating method for overcoating the resin-based paint, The coating film of the water-based acrylic resin-based paint can firmly adhere the coating film of the fluororesin-based paint overcoated with the substrate 1 side, and can maintain the excellent weather resistance of the fluororesin-based paint over a long period of time. it can. In addition, a coating film of an aqueous acrylic resin paint diluted with an aqueous sealer is interposed between the base material 1 and the overcoated fluororesin paint, so that the fluororesin paint is sucked into the base material 1 and has a film thickness. Can be reliably prevented.

In the above-described embodiments, the case where the primer is applied with a primer has been described as an example. However, a sealer may be undercoated or a slightly elastic paint may be undercoated.
Various paints such as Silvia WF-400 manufactured by Nippon Special Paint Co., Ltd. can also be used for the fluororesin paint.

  INDUSTRIAL APPLICABILITY The present invention is applicable when a building, a mortar wall of a steel structure, a concrete wall, an ALC panel, a siding, a tile, a steel material, etc. are coated with a fluororesin-based paint as a substrate to be coated.

DESCRIPTION OF SYMBOLS 1 Base material 2 Undercoat layer 3 Middle coat layer 4 Topcoat layer

Claims (4)

When overcoating a fluororesin paint on the substrate to be painted,
Underlying water-based acrylic resin-based paint diluted with water-based sealer under the fluororesin-based paint,
Fluorine painting method characterized by In the coating method, after applying the undercoat and intermediate coat to the base material to be painted, overcoating the fluororesin paint,
The intermediate coating was performed by applying a water-based acrylic resin paint diluted with a water-based sealer,
Fluorine painting method characterized by The aqueous sealer is a synthetic resin sealer,
The fluorine coating method according to claim 1 or 2, wherein: The aqueous sealer is mainly composed of one of acrylic resin emulsion, epoxy resin emulsion and acrylic resin varnish.
The fluorine coating method according to claim 3.

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