JPS6111315B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a new method of applying sputtering, as a method of metallizing plastics, to polyacetal moldings. Resin moldings that generally have good paintability, such as ABS
Metallization by sputtering, which is performed on molded products such as resin, involves degreasing the molded product with an appropriate solvent and then applying a base coat, such as urethane paint, polyester-urethane paint, acrylic-urethane paint, acrylic ester paint, etc. to the molded product. After coating and drying, chrome SUS is applied using sputtering equipment.
-304, chromium alloy, aluminum, etc. are sputtered under argon gas pressure of 5 x 10 ^-3 to 2 x 10 ^-4 Torr to generate a metal thin film of about 300 to 1000 A.
On top of that, apply a top coat such as acrylic ester paint, acrylic urethane paint, etc. and dry it.
It gives the molded product a metallic luster. However, polyacetal resin is a crystalline resin and is chemically stable, and an effective base coat paint that provides sufficient adhesion for practical use on molded products simply by degreasing the molded products has not yet been found.
Therefore, general sputtering methods cannot be applied as is. The inventor of the present invention has found that when a general base coat paint for sputtering as described above is applied to a polyacetal resin molded product, it has sufficient adhesion to the molded product and does not lose the smoothness of the coating even after painting, preventing sputtering. As a result of research into ways to ensure that metallized molded products have sufficient performance for practical use, we discovered that it is extremely effective to use cellulose paint as a primer and dry the paint prior to applying the base coat. Thus, we have arrived at the present invention. That is, the present invention provides a method for metalizing polyacetal resin moldings using a sputtering method, in which a thermoplastic, organic solvent-soluble cellulose paint is used as a primer to improve adhesion to the molding before applying a base coat. The present invention relates to a method for metallizing a polyacetal resin molded product, which is characterized by coating the polyacetal resin molded product as a polyacetal resin and heating it at 100 to 160°C. Cellulose-based paints used as primers in the present invention include cellulose acetate butyrate, cellulose acetate propionate, or nitrocellulose, which are thermoplastic and have the ability to form organic solvent-soluble films, or nitrocellulose with aliphatic additives as plasticizers. Examples include paints containing a phosphoric acid ester compound and a boron compound such as boron trifluoride as a reaction accelerator. 〓〓〓〓〓
The method of the present invention can be applied to polyacetal resin moldings made of so-called acetal homopolymers or acetal copolymers. The resin composition contains fillers such as calcium carbonate and talc, organic modifiers such as thermoplastic elastomers such as styrene-butadiene copolymers and thermoplastic polyurethanes, and inorganic modifiers such as glass fibers, glass beads, glass flakes, and mica. A reinforcing agent, an organic reinforcing agent, a stabilizer, etc. may be included. In the method of the present invention, a polyacetal molded product coated with the above cellulose paint as a primer is heated at 100°C to 160°C, preferably 130°C to 155°C.
Heat it up. The heating time is generally 10 minutes or more, preferably 30 minutes or more, and by sufficiently heating and drying, strong adhesion of the primer to the base material can be obtained. The paint used for the base coat and top coat, the coating method thereof, and the metallization method by sputtering can be carried out in the same manner as the above-mentioned conventional methods. The present invention will be explained in detail with reference to Examples below.
These examples are not intended to limit the invention in any way. Examples 1 to 8, Comparative Examples 1 to 4 Polyacetal copolymer "Dyuracon" M90
-02 Molded flat plate (manufactured by Polyplastics Co., Ltd.) (50
Primer manufactured by Celanese (trade name: 84-3701), made by plasticizing nitrocellulose with a chloralkyl phosphate plasticizer (×70×3 mm) and adding trimethyl borate as a reaction accelerator.
Composition: 11.0% by weight of nitrocellulose, 88.0% by weight of trichloroethyl phosphate, 1% by weight of trimethyl borate) was spray coated. Painted with the above primer
Spray a mixture of 100 parts and 20 parts of a mixed solvent of butyl cellosolve and acetone at a ratio of 6:4 at a pressure of 3 to 5 Kg/ ^cm2 , and use a spray gun W.SER61-1G made by Iwata Yaiki Kogyo. It was carried out with a spacing of 25 to 30 cm between the materials. After applying the primer, setting was performed at room temperature for 15 minutes to remove the solvent and smooth the paint, and then as shown in Table 1,
It was heated and dried at a temperature of 80 to 155°C for a period of 30 to 100 minutes. After that, polyester is used as a base coat.
Urethane paint (manufactured by Fujikura Kasei Co., Ltd., product name)
EXP1245) was further painted on top of that. The base coat was dried by heating at 120°C for 30 minutes, and then a chromium alloy was applied on top of it under an argon gas pressure of 5 x 10 ^-3 Torr using a Tokuda Seisakusho sputtering machine CFS-8ES.
Sputtering was performed to obtain a film thickness of ×500A. After sputtering, apply acrylic urethane paint (manufactured by Fujikura Kasei Co., Ltd., product name EXP1380) as a top coat.
was applied and forced dry at 80°C for 30 minutes. Using a knife, 11 lines were drawn at 1 mm intervals on the metallized film to create 100 squares, and a forced peeling test was performed using JIS cellophane tape. The adhesion of the metallized film to the base material was tested by testing per 100 pieces. For comparison, two-component alkyd paint (product name ND77B/cymel 303) manufactured by Rohm & Hass was used as the primer, but metallization was performed in the same way, and the same metallization was performed without using the primer. The results of the tests are shown in Table 1. Example 9 Metallization was carried out in the same manner as in Example 1, except that the following cellulose-based coating composition was used as a primer instead of the primer used in Example 1. Table 1 shows the heating drying conditions and the adhesion test results of the metallized film. Trichloroethyl phosphate 36.6% by weight Cellulose acetate butyrate 1.93 Boron trifluoride diethyl ethylate 1.15 Rutile titanium dioxide 8.20 Carbon black 0.43 Magnesium silicate 0.95 Thinner 50.74 〓〓〓〓

[Table] 〓〓〓〓〓

Claims (1)

[Claims] 1. In a method of metalizing a polyacetal resin molded product using a sputtering method, a thermoplastic, organic solvent-soluble cellulose paint is applied as a primer to improve adhesion to the molded product before applying the base coat, A method for metalizing a polyacetal resin molded product, which comprises heating at 100 to 160°C.