JPS58133868A - Structure of decorative painting on surface of synthetic resin molding and formation of said decorative painting - Google Patents

Abstract

PURPOSE:To apply decorative painting on the surface of a synthetic resin molding in a short time by forming an undercoating layer contg. essences for producing pearl feeling or metallic feeling on said surface and laminating a transparent top coating layer by paint curable by UV. CONSTITUTION:The surface 1 of moldings of, resins, acrylonitrile-butadien acrylonitrile-butadiene-styrene resins, acrylic resins or polycarbonate resins is cleaned. While the molding is rotated, quick drying paint contg. essences for producing pearl or metallic feeling is spray-coated to <=5 micron thickness, whereby an undercoating layer 2 is formed. After a drying stage within 1 minute, a transparent top coating layer 3 by paint curable by UV is spray-painted on the layer 2. The top coating layer is evaporated away of the solvents therein and is thoroughly set by irradiation of UV. The decorative painting free from cissing, loss of weight, and creasing is easily obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the structure of a decorative coating applied to the surface of a synthetic resin molded product and a method for molding this decoration. However, the purpose is to achieve a desired decorative coating in a short period of time.

Secondary processing that forms a decorative coating on the surface of a synthetic resin molded product such as 58 resin, B8 resin, acrylic resin, and polycarbonate resin in order to create a burl or metallic feel on the surface of the molded product. It is common practice to apply

Traditionally, decorative coatings have been applied to this molded product to give it a burl feel or a metallic feel.

First, a paint containing essence that gives a burl or metallic feel is applied to the surface of the molded product to form an undercoat layer, and then a transparent dog coat layer is applied on top of this undercoat layer. was.

In this conventional decorative coating formation, the undercoat layer is
To prevent mutual dissolution with the top coat layer applied thereon or to prevent the solvent contained in the dog coat layer from corroding the undercoat layer or penetrating the surface of the molded product, heat or It was necessary to completely assimilate it by reaction.

If this undercoat layer is not completely assimilated, the solvent contained in the applied top coat layer will erode or permeate the undercoat layer, causing wrinkles, a matte state, repelling phenomenon, or thinning phenomenon. As a result, it had the disadvantage that it was not possible to produce a pearly or metallic feel.

Therefore, when forming this type of conventional decorative coating, it is necessary to completely assimilate the undercoat layer, and even in a high temperature atmosphere it takes 10 to 10 minutes to assimilate the undercoat layer.
A curing drying time of 20 minutes was required.

The reason why it takes a long time for the undercoat layer to completely harden is because the undercoat layer is coated and cured in the form of a paint containing essence that gives a metallic feel to the undercoat layer. Therefore, in order to create a sufficient pearl or metallic feel, the thickness of the undercoat layer had to be increased.
) et al.

In addition, in the conventional case, the paint that forms the top coat layer contains a large amount of solvent and takes a long time to cure, so if the undercoat layer is not even slightly cured, the top coat The solvent in the layer easily penetrates into the undercoat layer, causing the above-mentioned disadvantages.

Original iJ! was invented to solve the drawbacks and inconveniences of the conventional examples described above. 1. Surface K of synthetic resin molded product
* An undercoat layer made of a fast-curing paint containing essence that gives a burl or metallic feel with a layer thickness of 8 z or less, and a transparent top coat layer made of an ultraviolet-curable paint. and are stacked in this order.

The present invention will be explained below with reference to the drawings.

The decoration ms according to the present invention is applied to the cleaned surface of the synthetic tree layer molded product 1 that is molded into a predetermined shape using Mu8 resin, MuB8 resin, acrylic resin, polycarbonate resin, etc.
A fast-curing paint containing essence that gives a pearl or metallic feel (an undercoat layer formed with a layer thickness of 51 talons or less!), a transparent top coat layer 3 formed from an ultraviolet curable paint, It has a structure in which these are laminated in order.

As the fast-curing paint for forming the undercoat layer 2, a solvent-volatile paint or a two-component paint such as vinyl lacquer or acrylic lacquer is used.

The fast-curing paint contains fine particulate essence that gives a pearly or metallic feel.

Although the undercoat layer 2 is extremely thin, with a thickness of less than -5 fcm, sprayed am cloth means is most suitable for forming such a thin layer.

The contained essence is considered to be in the form of fine particles, and each particle of essence has a certain size.Since the thickness of the 20 layers of the undercoat layer is extremely thin, this undercoat The coating layer 2 has a structure in which a fast-curing paint dissolves and adheres between the particles of each essence.

In this way, the undercoat layer 2 has a structure in which the fast-curing paint adheres between the particles of each essence, so it is more effective to form this undercoat layer 2 by spraying. I can understand the target of jin.

In other words, the air flow generated by the jet S scatters the solvent having a low specific gravity, thereby effectively exhibiting the dissolving adhesive effect of making the essence particles having a high specific gravity adhere to the surface of the molded article 10.

As is well known, the ultraviolet curable paint used to form the top coat layer 3 has many coating film constituents and low volatile components, and forms a coating film in a short period of time (approximately 15 to 2Q seconds). Even if the curing of the undercoat layer 2 is incomplete, the applied ultraviolet ? The solvent of the S-curing paint does not penetrate into the undercoat layer 2.

Especially, as mentioned above, the undercoat layer 2.

Since the undercoat layer 2 is coated and formed in an extremely small amount of solvent, the curing speed of the undercoat layer 2 is extremely fast, and it is cured to a degree of approximately 200 ms. Even if the paint is applied, it is unlikely that the solvent in the dog coat layer 3 will penetrate until the hardening process is complete.

However, in order to ensure that the solvent contained in the top coat layer 3 penetrates into the undercoat layer 2 more reliably, it is necessary to use ultraviolet curing W to form the top coat layer 3!
It is preferable to apply the paint using the same II #C* spray method as the fast-curing paint forming the undercoat layer 2.

This is done by spraying an ultraviolet curing i** material.

First, the small amount of volatile components contained in this ultraviolet curable paint can be more effectively removed, and the volatile components remaining in the undercoat layer 2 that has been applied beforehand can be removed. This is due to the promotion of volatilization.

Since this top coat layer is formed using an ultraviolet curable paint, the coating film formation time is short; however, as the layer thickness becomes larger, it takes a longer time to form the coating film. I will do it.

Therefore, as mentioned above, it is appropriate that this top coat layer 3 #i has a heating strength of about 40 tons so that a certain coating film can be formed within 15 to 20 seconds. .

Next, a method for forming the decorative ornament of the present invention described above will be explained.

First, the surface of the molded article 10, which has been molded into an appropriate shape, is cleaned in a cleaning step (a), and an undercoat (co)/i12 is sprayed onto the surface of the cleaned molded article (l).

When spraying this undercoat layer 2.

While rotating the molded article 1, a fast-curing paint for forming the undercoat layer 2 is sprayed.

This is because the rotational movement of the molded article 1 accelerates the volatilization of volatile components in the fast-curing paint that has been sprayed and applied.

When the spraying of the undercoat layer 2 is completed, a drying step of less than 1 minute (actually about 20 seconds is sufficient) is followed by a step 2 of applying the top coat layer 3.

In this drying process of the undercoat layer 2, the evaporation of the solvent contained in the undercoat layer 2 is promoted by blowing clean air onto the molded article l coated with the undercoat layer 2.

In the second step of applying the ultraviolet curable paint to form the TOGCO 113, it is advantageous to spray and apply the ultraviolet curable paint in the same manner as in the coating process for the undercoat layer 2 described above.

As mentioned above, by spraying the UV-curable WIk material onto the surface of the air undercoat layer 2, it not only accelerates the evaporation of a small amount of volatile matter contained in the UV-curable W paint, but also accelerates the evaporation of the small amount of volatile matter contained in the UV-curable W paint. This is because it also promotes evaporation of the solvent from the undercoat @2 formed by coating.

Once the top coat layer 30 Painter S2 is completed, 3~
After drying for 4 minutes, the top layer 3 is completely cured by UV irradiation to complete the molding.

The drying process of the top coat layer 3 is to evaporate the solvent contained in the ultraviolet curable paint forming the top coat layer 3, and the thickness of the top coat layer 3 is 30 layers thicker than that of the undercoat layer 2. is much larger, so about 3-4
It is best to dry it by blowing clean air on it for about 1 minute.

By the way, although the undercoat layer 2 is dried by spraying and spraying of clean air, the undercoat layer 2 is different from the top coat layer 3.
However, the top coat layer 3 is not completely cured prior to coating, and in reality, the top coat layer 3 is coated in a completely cured state.

Even if the undercoat layer 2 is not completely cured,
Even if the top coat layer 3 is applied on the undercoat layer 2, most of the solvent in the undercoat layer 2 has evaporated, as described above.

In addition, since the amount of solvent contained in the internal pressure of the ultraviolet curing agent coated on this undercoat coat layer 2 to form the top coat layer 3 is extremely small, There is no fear of any inconvenience or defects appearing.

The curing phenomenon continues even after the two undercoat layers and the top coat layer 3 are formed thereon, and complete curing is achieved.

As is clear from the above explanation, one aspect of the present invention is a repelling phenomenon,
The phenomenon of eye wear, even K111. It is possible to create an extremely good pearl or metallic feel without causing the inconvenience of wrinkles or a matte surface, and the time required to complete the decorative coating is extremely short. Furthermore, it has many excellent effects such as being able to reduce the thickness of decorative coating.

[Brief explanation of drawings]

, 1-1 is an enlarged sectional view showing the structure of the decorative coating according to the present invention. Figure 2 is an explanatory diagram showing the process order of the present invention. Explanation of symbols. 1... Molded product, 2... Undercoat coat layer, Mikawa Topcoat layer, A... Cleaning process 1 mouth... Coating process, C...
... Drying process S, 2... Coating process S, E... Drying process,
To... one dose of ultraviolet irradiation. Inventor Hiromi Nagayama Applicant Kisho Kogyo Co., Ltd. Representative Yatabe Yoshino

Claims (2)

[Claims] (1) A fast-curing agent containing an essence that gives a pearl or metallic feel to the cleaned surface of a synthetic resin molded product made from Mu1 resin, ABg resin, Ataryl resin, or polycarbonate resin, etc. an undercoat layer formed with a polyester paint to a layer thickness of 5 or less,
A m-bale structure with decoration on the surface of a synthetic resin molded product, which is made by sequentially laminating a top coat layer molded with UV-curable IT paint. (2) After cleaning the surface of a synthetic resin molded product made of Mu-B resin, Mu-MS resin, acrylic resin, polycarbonate resin, etc., the surface of the cleaned molded product is ffi! Apply a fast-curing paint containing an essence that gives a burl or metallic feel to a thickness of 5 ocrons or less to form an undercoat recoat layer, and dry within 1 minute after forming the scissor undercoat layer. Time 11 Apply an ultraviolet curable AM material on the undercoat layer, evaporate the solvent in the applied UV curable Il paint, and then irradiate it with ultraviolet rays to form a top coat layer. Decorative coating on the surface of the synthetic resin molded product. Molding method.