JPS5825329B2 - Plastic molded products or their manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a plastic molded article partially having a metallic luster layer or a colored layer on its surface layer, and a method for producing the same.

More specifically, the present invention relates to a plastic molded article formed by heat-pressing a hot-stamped foil whose surface has been given a metallic luster or is colored, and then coating the molded article with a clear paint or a transparent colored paint, and a method for manufacturing the same.

Vacuum deposition plating, color painting, hot stamping, and the like are known as conventional techniques for partially creating a metallic appearance or coloring the surface of a plastic product.

However, with vacuum evaporation plating and colored painting, ■ Even if the entire product is bright or partially colored,
It has drawbacks such as the process being complicated or difficult, such as requiring operations to prevent the paint from adhering to undesired areas, and (2) high cost.

Further, when producing a molded article partially having a metallic luster layer or a colored layer, a hot stamping method is often employed.

However, the conventional hot-stamp foil stamping method is not satisfactory in terms of the performance of the products obtained, especially when used for automobile exterior parts that require weather resistance and abrasion resistance. It was difficult.

The reason for this is pointed out as follows. That is, after hot stamping on the desired surface part of the plastic product,
When it is necessary to remove the foil from that part, the operating means used is to peel it off by hand.

For this purpose, the thickness of the top coat of the hot-stamped foil must be very thin (usually 2-3 microns).

However, on the other hand, the performance of hot stamping foil is
Mainly, since the performance of this top coat is greatly affected, attempts have been made to increase the thickness of the top coat.

If the film thickness is 4 μm or more, the foil will not come off easily after hot stamping, and the product value will be lost.

On the other hand, although various studies have been made to improve the performance of the topcoat film, it is difficult to obtain sufficient abrasion resistance with a film thickness of 2 to 3 μm.

Therefore, the product in this case is unsuitable for use in automobile exteriors, which require high wear performance.

On the other hand, when the top coat has a thickness of 2 to 3 μm, it is difficult to block all the ultraviolet rays of sunlight, and as a result, the plastic product is significantly deteriorated.

In the present invention, a metallic luster layer or a colored layer is partially formed on a plastic product by a hot stamping method, and a clear coating film or a transparent colored coating film of a predetermined thickness is further formed on this layer, thereby improving weather resistance. It is an object of the present invention to provide a plastic product having a partial metallic luster layer or a colored layer that has excellent abrasion resistance and is particularly durable for use on the exterior of automobiles.The present invention provides a plastic product that has a high degree of freedom in design and color tone and is wear resistant. , a plastic molded article partially having a metallic luster layer or a colored layer with excellent weather resistance, and a method for producing the same are provided.

That is, the plastic molded article provided by the present invention has a wear resistance of about 1
(Taper set abrasion test method, 500g load, wear ring C8-10 used) Weather resistance also improves by about 1.5 times.

To explain the plastic molded product of the present invention and its manufacturing method in more detail, in the present invention, a hot stamp foil is partially bonded to the surface of the plastic molded product by heating and pressing under predetermined conditions.

That is, to explain with reference to the accompanying drawings, there is a hot-stamped adhesive layer (2 in Figure 1) facing the plastic, and on top of that, a vapor-deposited metal layer or a colored pigment layer (3 in Figure 1). Above that is a top coat layer (4 in Figure 1).

The thicknesses of these constituent layers are as follows: adhesive layer number μ, vapor deposited metal or colored pigment layer 400 to 1000 A1, and top coat layer 2 to 3 μ.

On top of these hot stamp layers, there is a clear coating layer or a transparent colored coating layer whose main component is a vehicle consisting of 100 parts of an acrylic polyol with an OH number of 10 to 40 and 5 to 100 parts of a non-yellowing polyisocyanate. Apply 10μ or more of (5 in Figure 2).

This film thickness is necessary to obtain the desired performance in terms of wear resistance and weather resistance.

This clear paint or transparent colored paint film has a rating of 5.
If the film thickness is 0 to 60 μm or more, the paint will sag, which is unfavorable in terms of appearance.

Clear paint or transparent colored paint has an OH value of 10~
This is a urethane paint whose main component is a vehicle consisting of 100 parts of an acrylic polyol of No. 40 and 5 to 100 parts of a non-yellowing polyisocyanate.

Plastic materials in the present invention include ABS,
Examples include general thermoplastic plastics such as As, PBT, and PET, and thermosetting resins such as phenol resins, melamine resins, and urea resins.

An object of the present invention is to partially provide a metallic luster layer or a colored layer on the surface of a plastic molded article to improve the weather resistance and abrasion resistance of the surface.

The adhesive layer 1 in the attached drawings and FIG. It is made by mixing TiO2 in order to improve the foil cutting ability.

Next, the vapor-deposited metal layer or colored pigment layer is itself intended to provide a decorative effect on the plastic.

The top coat exists to maintain the performance of the deposited metal or colored pigment layer, and must also have good adhesion to the adhesive layer.

The clear coating film or transparent colored film exists for the purpose of preventing deterioration of the hot stamp layer and plastic and protecting the product appearance from being damaged for a predetermined period of time.

In the structure hot-stamped onto plastic (Fig. 1), the abrasion resistance is very low because the film thickness at the top of the hot-stamp is thin.

That is, taper set wear test 500g load, C8-1
When using 01J ring, it is 120 to 150 times, and when using Ford type abrasion test with 700g load and wearing cotton canvas #10, it is about 500 to 700 times, but when a clear coat is applied as shown in Figure 2. The performance is 1200 to 1500 times in the taper set abrasion test and about 100,000 times in the Ford type abrasion test, which is an improvement of more than 10 times.

On the other hand, in the weather resistance test, in the sunshine weather meter test, hot stamping alone had a
If a clear coating is applied to a product that deteriorates after 0 hours, its performance will be improved to over 1000 hours.

Example I A plastic product made of ABS resin is hot-stamped with ROM foil 4560 manufactured by Thermark, Inc., USA, at 180° C. for 1.8 seconds.

Thereon, as a clear coat, 10 parts or more of a paint containing 15 parts of non-yellowing incyanate, hexamethylene diisocyanate as a main component per 100 parts of OHH2O2 acrylic polyol, is applied and cured at 70°C for 60 minutes.

Typical performance with and without clear coating is shown in Table 1.

Example 2 A plastic product made of ABS resin is hot-stamped with ROM foil 3588 manufactured by Thermark Corporation in the United States at 180 degrees α for 1.8 seconds.

Then, as a clear coat, apply at least 10 parts of a paint whose main ingredients are 25 parts of non-yellowing xylene diisocyanate (DI4ON, manufactured by Orable Pharmaceutical Co., Ltd.) to 100 parts of acrylic polyol with an OH value of 25, and heat the coating at 70°C for 60 minutes. Let it harden.

Typical performance with and without clear coating is listed in Table 1.

As is clear from the above detailed explanation, the plastic molded product having a clear coat on the hot stamp obtained by the present invention has remarkable coating film performance, such as wear resistance, compared to conventional hot stamped products. In particular, the present invention can provide a variety of plastic products for outdoor use, such as automobiles, outdoor decorations, and signs such as road signs, billboards, etc., which have excellent weather resistance, and for which a metallic appearance is desired. The weather resistance of the product is extremely good, with no abnormalities even after 1000 hours of irradiation with the Sunshine Weather-Ometer, and it also showed no abnormalities in the Ford type abrasion test over 100,000 times. The product has improved durability and can withstand outdoor use.

In other words, there was a desire to increase the thickness of the top coat of conventional hot stamps to improve performance, but if the thickness was increased, the foil would not cut easily and the product value would drop significantly, making it impossible to commercialize the product. By combining the hot stamping method and the painting method, the desired performance could be obtained.

From the above description, it will be understood that the present invention provides an extremely useful new technology in the technical field of plastic molded products.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of the case where only hot stamping is applied on the resin, and FIG. 2 is a cross-sectional view of the case where a clear coat is further applied on the hot stamping. 1...Resin product, 2...Adhesive layer of hot stamp, 3...Metal deposited layer or colored pigment layer of hot stamp, 4...Hot Top membrane layer of the stamp, 5...Clear coat layer.

Claims (1)

[Scope of Claims] 1 A molded article partially having a metallic luster layer or a colored layer on its surface layer, the surface layer comprising (a) a metallic lustrous or colored hot stamp layer (b)
) A clear coating film whose main component is a vehicle consisting of 100 parts of an acrylic polyol with an OH value of 10 to 40 and 5 to 100 parts of a non-yellowing isocyanate, or a transparent colored coating layer (a clear coating with a coloring agent such as a dye) A plastic molded article characterized by being formed in the following order: 2. A method for manufacturing a plastic molded article having a partially metallic luster layer or a colored layer on the surface layer, which comprises: (a) heating and pressing a metallic luster or colored hot stamp onto the plastic surface; , transfer the stamp layer to plastic, and then (b) 10 acrylic polyol with an OH value of 10 to 40.
C) Cure the clear paint or transparent colored paint by heating and drying. 1. A method for producing a plastic molded product having a metallic luster layer or a colored layer on its surface layer.