JP3211369B2 - Resin molded painted product and method of manufacturing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin molded product, and more particularly to a resin molded product suitable as an automobile exterior part and a method for producing the same.

[0002]

2. Description of the Related Art As a conventional resin molded article, there is a resin molded article in which a base coat containing a metallic powder and a colored clear coat are laminated, and the cross section is as shown in FIG. 2, for example. I have. In the figure,
Reference numeral 1 denotes a resin molded product serving as a base material. On this resin molded product 1, a metallic base coat 3 containing a metallic powder 2 and a colored clear coat 4 containing a dye or a highly transparent colorant are further provided thereon. It is laminated.

[0003] In such a resin-molded coated product, a luster due to the light reflection of the metallic powder 2 in the base coat 3 and the interaction with the colored clear coat 4 form a painted surface having a design called candy tone. You.

[0004] However, in such a conventional resin molded product, the metallic powder 2 is placed on the resin molded product 1.
, And the colored clear coat 4 is applied over the metallic base coat 3, so that the thickness of the metallic base coat 3 or the colored clear coat 4 fluctuates and the color tone of the obtained coated surface greatly varies. Was. In particular, in the case of a resin molded painted product having a complicated shape such as an automobile exterior resin component, there is a problem that the color tone varies depending on the part of the component because a variation in the film thickness at the curved surface portion of the component is inevitable.

In addition, since at least two coating steps are required, there are also problems that the number of work steps is large and the cost is high.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of such a conventional problem. In order to solve the above problem, a color difference (ΔE ^* ) due to a change in the thickness of a colored clear coat is solved. Further, it is an object of the present invention to provide a resin molded product having little change in color tone and excellent design such as sharpness and depth. Another object of the present invention is to propose a method of manufacturing a resin molded article which can easily produce the above resin molded article at low cost.

[0007]

The present invention relates to the following resin molded article and a method for producing the same. (1) A resin molded product containing a metallic powder and a colorant and having a surface lightness (L ^* value) of 30 or less; and a colorant and having a total light transmittance of 30 to 90 in a wavelength range of 400 to 700 nm. %, And a colored clear coat formed on the resin molded article. (2) On a resin molded product containing a metallic powder and a colorant and having a surface lightness (L ^* value) of 30 or less, a colorant is contained, and the total light transmittance in the wavelength range of 400 to 700 nm is 30 to A method for producing a resin molded article, characterized in that a colored clear coat of 90% is applied.

As the material of the resin molded product, any material suitable for the purpose of use of the resin molded coated product can be used without limitation. For example, polyvinyl chloride (PVC) resin, ABS resin, ionomer resin, polyamide (PA) resin, polyphenylene Thermoplastic resins such as oxide (PPO) resins; thermosetting resins such as unsaturated polyester resins;

Examples of the metallic powder to be contained in the resin molded product include metal powders such as aluminum powder, copper powder, and stainless steel powder; mica powder whose surface is coated with a metal oxide such as titanium oxide; and flakes such as glass flakes. Powders obtained by plating gold or silver on the surface of the material can be used.

As a coloring agent to be contained in a resin molded product,
Known coloring agents used for coloring the resin can be used without limitation, and examples thereof include coloring pigments such as phthalocyanine-based and quinacridone-based organic pigments; and azo-based dyes.

The surface lightness (L ^* value) of the resin molded product must be 30 or less. When the L ^* value exceeds 30, the color tone changes greatly due to the change in the thickness of the colored clear coat, and cannot be practically used for coating a molded article having a complicated shape such as an automobile exterior resin part. There is no particular limitation on the shape of the resin molded product.

The resin molded article of the present invention is obtained by directly forming a colored clear coat on such a resin molded article without applying a base coat.

The colored clear coat formed on the resin molded article is a colored clear coat comprising a colorant and a film-forming binder component and having a total light transmittance of 30 to 90% in a wavelength range of 400 to 700 nm. The total light transmittance is a value measured by the method of JISK 7105.

As the above-mentioned coloring agent, dyes and coloring pigments having high transparency which have been conventionally used as coloring agents for colored clear coats can be used, and preferably coloring agents used in automotive topcoats can be used. .

Specific examples of such coloring agents include, for example, coloring pigments such as phthalocyanine-based and quinacridone-based organic pigments; and azo-based dyes.

As the film-forming binder component, a resin capable of forming a continuous film by applying to a substrate and drying or heating, for example, acrylic resin, polyester resin, vinyl resin, polyurethane resin, amino resin, etc. Can be used alone or in combination of two or more. Preferably, those used for a clear coat for resin parts for automobile exteriors are desirable. The dry film thickness of the colored clear coat is usually 20 to 40 μm, preferably 30 to 35 μm
Is desirable.

It is necessary that the light transmittance of the colored clear coat is in the range of 30 to 90% when the total light transmittance is measured at a wavelength of 400 to 700 nm. If the total light transmittance is lower than 30%, much of the incident light is absorbed by the colored clear coat, so that the amount of light that reaches and is reflected by the resin molded product is too small. The design effect due to the interaction between the coloring agent and the coloring agent of the colored clear coat cannot be obtained. On the other hand, when the total light transmittance exceeds 90%, the coloring effect of the colored clear coat is low, so that the design effect due to the interaction with the coloring agent of the resin molded product cannot be obtained.

FIG. 1 is a cross-sectional view showing a cross section of a resin-coated product of the present invention. 2 denote the same or corresponding parts. In the figure, reference numeral 1 denotes a resin molded product serving as a base material, and a colored clear coat 4 containing a colorant is applied on the resin molded product 1 to form a resin molded coated product. The resin molded article 1 contains the metallic powder 2 together with the coloring agent.

In such a resin molded article, by setting the surface lightness (L ^* value) of the resin molded article 1 within the above range, the color difference (ΔE ^*) of the painted article due to the variation in the film thickness of the colored clear coat 4 is obtained ^. ) Becomes smaller. Further, since the conventional base coat is omitted, a change in color tone due to a change in the thickness of the base coat can be completely prevented, and a uniform color tone can be obtained. The interaction between the color tone of the resin molded product 1 and the color tone of the colored clear coat 4 provides excellent clarity and depth, and high designability.

Next, a method for manufacturing such a resin molded article will be described. First, a colored resin is manufactured by dispersing a metallic powder and a colorant in a material of a resin molded product.
At this time, it is preferable that the metallic powder and the colorant are uniformly dispersed. This colored resin is molded into a desired shape to produce a resin molded product. The molding method is not particularly limited, and known molding methods such as injection molding, extrusion molding, blow molding, and SMC molding can be employed.

Next, by coating the colored clear coat on the resin molded product, a resin molded coated product can be manufactured. The coating method is not particularly limited, and a known coating method such as, for example, spray coating, dip coating, and brush coating can be employed. The resin molded coated article of the present invention can be used as an automobile exterior part or the like.

[0022]

Next, an embodiment of the present invention will be described. Examples 1 to 4 and Comparative Examples 1 to 3 The metallic powders and coloring agents shown in Table 1 were uniformly dispersed in polyvinyl chloride (PVC) to obtain a polyvinyl chloride compound. This polyvinyl chloride compound was molded by injection molding to obtain a test piece composed of a resin molded product. A colored clear coat containing the coloring agent shown in Table 1 was applied on the test piece by air spray so that the film thickness became 25 μm, 30 μm, and 35 μm with a coating width of １ ／, and the colored clear coat was applied. In this way, a coated product having a variation in film thickness was obtained. Colorimetry was performed for each film thickness of the colored clear coat of the coated product, and the appearance was visually determined. Table 2 shows the results. The physical properties shown in Table 2 were measured by the following methods.

(1) Measurement of brightness (L ^* value) of test piece CR200 (trade name) manufactured by Minolta Camera as a measuring instrument
This was performed using (2) Measurement of total light transmittance According to the method of JIS K 7105, the measurement was performed using a self-recording spectrophotometer U-2000 (trade name) manufactured by Hitachi, Ltd. as a measuring instrument. The coating film was formed by a mercury amalgam method and measured for a film having a thickness of 30 μm. (3) Measurement of color difference (ΔE ^* ) The measurement was carried out according to the method of JIS K 7105, using the above-mentioned CR200 manufactured by Minolta as a measuring instrument. (4) Visual appearance The sharpness was determined according to the following criteria. ：: Vividness is felt. Δ: Vividness is slightly smudged. X: Smell is felt (blackness is lost). The sense of depth was determined according to the following criteria. ○: Feel the thickness of the paint film (paint) (feel the thickness more than the actual film thickness) △: Feel the thickness of the paint film (paint) somewhat ×: The paint film (paint) looks flat (thickness I don't feel at all)

[0024]

[Table 1]

[0025]

[Table 2]

[0026]

As described above, according to the present invention, a resin molded product is made to contain a metallic powder and a colorant, and the surface lightness (L ^* value) is set within a specific range.
Because a colored clear coat having a total light transmittance within a specific range is applied on this resin molded product, a change in color tone due to a change in the thickness of the base coat is completely prevented,
Moreover, since the surface lightness (L ^* value) of the resin molded product is within a specific range, the color difference (ΔE ^* ) of the coated product is small even if the thickness of the colored clear coat varies, thereby obtaining a uniform color tone. Further, the interaction between the color tone of the resin molded product and the color tone of the colored clear coat provides an effect of obtaining a resin molded product having excellent design properties such as sharpness and depth.

Further, according to the present invention, since the step of coating the base coat is omitted, it is possible to obtain an effect that a resin molded article can be manufactured simply and at low cost with a small number of work steps.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a resin-coated product of the present invention.

FIG. 2 is a cross-sectional view of a conventional resin molded product.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Resin molded product 2 Metallic powder 3 Base coat 4 Colored clear coat

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-58-101123 (JP, A) JP-A-61-90773 (JP, A) JP-A 60-864 (JP, A) (58) Survey Field (Int.Cl. ⁷ , DB name) B05D 1/00-7/26

Claims (2)

(57) [Claims] 1. A composition comprising a metallic powder and a colorant,
A resin molded product having a surface lightness (L ^* value) of 30 or less; a colorant; a total light transmittance in a wavelength range of 400 to 700 nm of 30 to 90%; And a colored clear coat. 2. It contains a metallic powder and a colorant,
On a resin molded product having a surface lightness (L ^* value) of 30 or less, a colored clear coat containing a colorant and having a total light transmittance of 30 to 90% in a wavelength range of 400 to 700 nm is applied. Characteristic method of manufacturing resin-coated products.