JPH0312946B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a coating method, in which a synthetic resin paint containing a large amount of inorganic filler is applied, and a transparent paint or an opaque paint is applied on top of this. This makes it possible to easily and economically obtain a dry lacquer-like coating.

[Prior art and its problems]

Dry lacquer has been known for a long time as a type of lacquer painting. Dry lacquer is a mixture of lacquer and lacquer powder that is applied to the surface of wooden carvings, etc., to create fine irregularities on the surface of the coating, giving it a calm texture.

However, this dry lacquer technique had the problem of poor workability, such as the time it took for the paint film to dry.Furthermore, lacquer was produced in small quantities, was in short supply, and was expensive.

[Means for solving problems]

Therefore, in the present invention, after applying a synthetic resin paint mixed with a large amount of inorganic filler, a transparent or opaque paint is applied on top of this to obtain a dry lacquer-like paint film at low cost and with good workability. I made it possible to do so.

The coating method of this invention involves coating a base material with a specific inorganic filler at a resin content of 100 parts (parts by weight, the same applies hereinafter).
A synthetic resin paint containing 100 to 200 parts of the paint is applied, and a transparent synthetic resin paint is applied on top of this.

As the base material, in addition to wood materials such as natural wood, lauan plywood, and boards, plastic materials and metal materials can be used as desired, and the base material is adjusted according to the material.

A synthetic resin paint containing a filler is applied onto this base material. One or more types of inorganic particles selected from the group of relatively hard silicon carbide, silica, alumina, zirconia, and titanium carbide are used as the filler, and the particle size is 50 to 100μ.
m, preferably in the range of 50 to 65 μm. If the particle size is less than 50 μm or more than 100 μm, a dry lacquer-like coating cannot be obtained, which is disadvantageous. This filler is mixed into the synthetic resin paint in an amount of 100 to 200 parts per 100 parts of the resin in the paint. If the amount is less than 100 parts, a dry lacquer-like coating film will not be obtained, and if it exceeds 200 parts, the resin content will be insufficient and the strength of the coating will decrease, which is disadvantageous.

Synthetic resin paints include, but are not limited to, oil-based paints, cellulose paints, phenolic resin paints, alkyd resin paints, vinyl resin paints, acrylic resin paints, epoxy resin paints, polyurethane resin paints, unsaturated polyester resin paints, and other colored paints. Opaque paints are used, and among them, polyurethane resin paints and acrylic urethane resin paints are preferred, and those with slightly higher viscosity are preferred from the viewpoint of filler dispersibility. This synthetic resin paint may contain ultrafine silica (Aerosil) or the like in order to uniformly disperse the filler. The blending amount of ultrafine silica is 5 to 15 wt%, preferably 8 to 12 wt%, based on the inorganic filler.
%. Other plasticizers, desiccants, thickeners, dispersants, diluents, etc. can be added to this synthetic resin paint as appropriate and necessary.

Synthetic resin paints containing this inorganic filler are
It is applied onto the above substrate by normal painting methods such as spraying, but since it contains a large amount of filler with a relatively high specific gravity, it is important to stir the paint well during application to ensure uniform dispersion. It is.

The thickness of this coating film after drying is approximately 20 to 50 .mu.m. If it is less than 20 .mu.m, the holding power of the filler particles will be insufficient, and if it exceeds 50 .mu.m, the irregularities will become uneven, which is disadvantageous.

After application, after 1 to 2 hours of drying time,
A transparent or opaque synthetic resin paint is applied on top of this as a top coat. As this paint, a synthetic resin paint having the same vehicle as the previous synthetic resin paint is usually used, but a different type may be used as long as the adhesion of the coating film is good. This paint is also applied by a normal painting method such as a spray method, and the film thickness after drying is approximately 20 to 50 μm. If it is less than 20 μm, it is too thin and a dry lacquer-like finish cannot be obtained.
If it exceeds 50 μm, the uneven portions of the undercoat film become flat, and similarly, a dry appearance cannot be obtained.

The drawing shows a coating film obtained by such a coating method, and in the drawing, reference numeral 1 indicates the base material, and 2
is an undercoat film made of paint containing filler,
3 is a top coat film made of paint. Filler particles 4 are dispersed within the undercoat film 2, thereby forming fine irregularities on the surface of the film.

[Effect]

In the coating film obtained by such a coating method, inorganic filler particles are dispersed to form fine irregularities on the surface, resulting in a difference in gloss between the convex and concave areas. As a result, a dry lacquer-like appearance appears.

In addition, since the coating work can be performed in the same manner as with ordinary synthetic resin paints, the workability is good and the coating cost does not increase significantly.

Furthermore, since the inorganic filler particles dispersed in the coating film are all highly hard particles, the abrasion resistance of the coating film is significantly improved.

〔Example〕

A paint with the following formulation was prepared.

Acrylic urethane resin paint (resin content 35wt%)
100 parts silicon carbide (average particle size 50 μm) 100 parts ultrafine silica (#300) 12 parts coloring pigment 50 parts diluting thinner 25-50 parts Spray this paint onto the prepared plywood and let it stand at room temperature. After drying for 1 hour, an undercoat film with a thickness of 30 μm was obtained. Next, spray acrylic urethane resin transparent paint on top of this and adjust the thickness.
A 30 μm topcoat film was formed.

The resulting coating film had a beautiful dry lacquer-like appearance.

In addition, when the abrasion resistance of this coating was measured using the JAS Abrasion B test, it was 0.01g at 50 rotations, which is significantly higher than the 0.06g at 50 rotations of a coating made with ordinary acrylic urethane resin paint. It became clear that the performance was improved.

〔Effect of the invention〕

As explained above, the coating method of this invention involves applying a synthetic resin paint containing a large amount of 100 to 200 parts of a specific inorganic filler, and then applying a synthetic resin paint on top of this, making it inexpensive. Dry lacquer-like coatings can be easily obtained using synthetic resin paints. Moreover, this coating film also has excellent abrasion resistance due to the dispersion of the inorganic filler.

[Brief explanation of drawings]

The drawing is a schematic cross-sectional view showing a coating film obtained by the coating method of the present invention. 1... Base material, 2... Undercoat film, 3... Top coat film, 4... Inorganic filler particles.

Claims (1)

[Claims] 1. On the base material, 100 to 200 of an inorganic filler with a particle size of 50 to 100 μm selected from the group of silicon carbide, silica, alumina, zirconia, and titanium carbide is added to 100 parts by weight of the resin.
A coating method characterized by applying a synthetic resin paint containing parts by weight, and then applying a synthetic resin paint on top of this.