JPS6031532A - Method for treating surface of transparent resin molding - Google Patents

Abstract

PURPOSE:To coat advantageously the surface of a transparent resin molding having a print layer with a cured silicone resin film having good appearance, by providing a primer coat, a specified print layer and a cured silicone resin layer in that order on the surface of a transparent resin molding. CONSTITUTION:A primer coat and an ink coat layer are provided in that order on the surface of a transparent resin molding. Further, a silicone resin for surface hardening is applied thereto and cured. Examples of the paints and ink for plastics are acrylic paint or ink and epoxy resin silk screen ink. This ink has good adhesin to the primer coat for the silicone resin for surface hardening. Further, this ink is not dissolved out of the surface so that when printing is made with the epoxy resin silk screen ink, the printed surface can be directly coated with a priming paint without any masking treatments and the primer coat can be then coated with the silicone resin for surface hardening.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of Defense] The present invention relates to a method for curing the surface of a transparent resin molded body having a painted or printed portion.

[Technical background of the invention and its problems] In molded articles made of transparent resins such as acrylic resins and polycarbonate resins, silicone resin is usually added to the surface to improve wear resistance and weather resistance. The hardened coating is graded.

On the surface of the transparent resin molded body having such a cured film,
1. When painting or printing Momo, marks, characters, etc.,
Ordinary plastic paints or inks have poor adhesion, and IC silicone rubber inks have good adhesion but lack abrasion resistance and weather resistance, which are also required for general coatings. There was a problem that the physical properties were not clear.

Furthermore, a method has been considered in which the transparent resin molding is directly painted or printed and then a surface-curing silicone resin is applied thereon, but this method C uses ordinary acrylic resin for painting and printing. Plastic use of resin tongue
31 or when ink is used, it increases the density of the surface-curing silicone resin, so it easily dissolves in the primer paint used as an undercoat, and it tends to dissolve at the paint border or cause printed characters to bleed. There was a problem.

This problem does not occur with the method of painting without using a primer paint or spraying a surface-curing silicone resin directly onto the printed area, but this method tends to cause uneven coating and adhesion of foreign matter, and is also expensive. There was a problem.

[￥f, Purpose of Light] The present invention has been made to solve these problems, and after painting or printing patterns, etc. on the surface of a transparent resin molding, it is possible to make the entire body durable. Silicone with excellent abrasion resistance and weather resistance: How to cover with a hardened film of J-based resin 11? The purpose is to provide services.

[Summary of the Invention] The method for surface treatment of a transparent resin molded body according to the present invention involves sequentially applying a primer coating layer and a coating printing layer of plastic Wvl or ink on a transparent M4 resin molded body. [After printing, a silicone resin for surface hardening is applied on top of the surface hardening resin, and this is then cured.

Commercially available paints or inks for plastics used in the present invention are, for example, Refrac #72 manufactured by Fuji Ohm Kasei Co., Ltd., +7) No. 1200 manufactured by Cashew Paint Co., Ltd.
Planet, manufactured by SA Lysine Electric Co., Ltd., and Braace, manufactured by Take M Paint Co., Ltd., both have product names).

All of these plastic paints or inks dissolve in acrylic resin-based primer paints, but they do not have any d in surface-curing silicone-based 4'A IIt7, so when using them, To do this, first apply the primer paint to the entire surface of a transparent resin molded body such as acrylic resin or polycarbonate resin, and after drying the primer paint, predetermined painting and printing are performed on it, and then -L is preferably coated with a surface-curing silicone resin.

According to such a method, it is possible to perform ゛C spray painting as a coating method for surface hardening silicone resin, and compared to conventional spray painting, it is possible to perform +llI coating with a good appearance without uneven coating or adhesion of foreign matter. You can get a body.

Furthermore, the consumption of silicone resin for surface curing can be significantly reduced.

Furthermore, according to the present invention, a -boxy resin-based silk ink can be used as the plastic paint or ink for the above-mentioned acrylic resin-based plastic paint or ink.

This ink has good stoneability compared to the surface-curing silicone-based resin primer paint described above, but it does not elute and leak, so it is suitable for printing on epoxy resin-based silk ink. If this is done, a primer paint can be applied directly on top of this without any masking treatment, and then a surface-curing silicone resin can be applied on top of that.Printing with epoxy resin silk ink Curing of the coating layer requires heat treatment at a temperature of about 90 to 120°C, but if acrylic resin or polycarbonate resin is used as the base resin, it can sufficiently withstand this temperature.

[Actual invention 1# example] Examples of the present invention will be described below.

Example 1 After cleaning the surface of an acrylic resin molded body with isopropyl alcohol, the entire surface was coated with primer P.
H91 (trade name of primer coat manufactured by Toshiba Silicone Co., Ltd.)
Dip it in and paint it, at a temperature of 20 to 25 degrees Celsius, and 50 feet of wet water 6
Primer paint applied to the surface under 0% conditions
Air dried for ~40 minutes.

Next, a screen with punched letters was placed on top of the coated layer of primer paint, and LeFrac #72 was applied, followed by drying at a temperature of 50 to 60° C. at about 111:1 bending. Thereafter, the whole was immersed in Tosgard 510 (trade name of surface-curing silicone resin manufactured by Toshiba Silicone Co., Ltd.) and heated at 90° C. for 3 hours to cure the coating layer.

FIG. 1 shows the acrylic resin molded body with the letter-coated area obtained in this way. In this figure, reference numeral 1 indicates an acrylic resin molded body, 2 indicates a coated layer of primer P1191, 3 indicates a coated layer of Refrac #72, and 4 indicates a cured layer of TOSGUARD 510. The molded product obtained in Example 1 is coated with a coating II cured film of Toscard 510, which is a silicone resin for surface hardening, on the outermost side, so it exhibits high resistance to 17mm and weather resistance. The coating layer of Refrac #72 on the painted part did not peel or smudge.

Example 2 After silk printing the letter C on the surface of a polycarbonate resin molded body using #1000 type epoxy resin silk ink manufactured by Zeiko Advance Co., Ltd., it was heated at a temperature of 120°C for 3
The C printed area was cured by heating for 0 minutes.

Next, the entire surface of the polycarbonate 1-61 resin molding including the printed area was degreased and washed using isopropyl alcohol, and then the entire surface was dip coated with Primer 1) I-191 and air-dried for 30 minutes at room temperature. Next, the entire surface was coated by dipping an ultraviolet absorber into a mortar 4j'jJ61 to Sgard 510, and the coated layer was cured by heating at a temperature of 120° C. for 1 hour.

At this temperature, polycarbonate 1 to resin molded body 1' were heated, with the υ' character printed area shown on the right as shown in FIG. In Figure 2, C
Reference numeral 5 is a polycarbonate resin molded body, 6 is a printing layer of resin-based silk ink, and 7 is a primer P l-
191 is a coating layer, and 8 is a coating hardened layer of Toss Guard 510.

In the molded article obtained in Example 2 constructed in this way, the epoxy resin-based silk ink printing layer in the character printing area did not peel off or smudge. Furthermore, the epoxy resin-based silk ink printing layer was covered with a coating hardening layer of Tosguard 510 containing an ultraviolet absorber, and the printed area did not change color by 1°C over a long period of time.

[Effects of the Invention] As is clear from the above description, according to the present invention, it is possible to obtain a J6 light resin molded product having a painted or printed portion that is excellent in abrasion resistance and weather resistance, and has no peeling or bleeding of characters. .

[Brief explanation of drawings]

Fig. 1 is a horizontal 11Ji side view of the character-painted part of the molded body obtained in Example 1 of the present invention, and Figure 2 is a cross-sectional view of the character printed part of the molded body obtained in Example 2 of the present invention. It is a diagram. 1...Acrylic resin molded body 2.7
...Coating layer 3 of primer P l-191...
・・・・・・・・・Refrac 372 coating layer 4.8
...Coated hardened layer 5 of Toss Guard 510...
......Polycarbonate resin molded body 6...
・・・・・・・・・・Patent attorney representing the printing layer of epoxy Ifil l1it silk ink Sasu Suyama - Figure 1 Figure 2

Claims (1)

[Claims] (1) After sequentially providing a coating layer of primer paint and a coating and printing layer of plastic coating or ink on a transparent resin molded body, a surface-curing silicone resin is applied thereon and then cured. Characteristic surface treatment method for transparent resin moldings. 2) Use epoxy resin silk ink as the paint or ink for plastics, apply it directly onto the transparent resin molding, apply primer paint on top of it, and then apply it on the surface. A method for surface treatment of a transparent resin molded body, characterized by applying a curing silicone resin and curing it.