JPS5855070A - Production for spot pattern by spray painting - Google Patents

Abstract

PURPOSE:To obtain desired spot patterns easily by producing spot patterns on a substrate surface in accordance with specific painting conditions then applying top coating thereon. CONSTITUTION:The paint of 18-22 sec viscosity prepd. by diluting an epoxy vinyl resin by using a thinner of ester or hydrocarbon base is sprayed on the surface of a substrate made of an ABS resin or the like under conditions of 0.05-0.25kg/cm<2> spray atomization pressure so as to be coated at 0.5-1g/10cm<2>, whereby spot patterns 2 are produced. Top coating 3 is applied on the patterns 2.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing a spotted pattern on the surface of a substrate such as a resin molded product.

Conventionally, in order to create speckled patterns on the base surface of resin molded products, etc., the speckled pattern is first created on the effective surface of the mold using physical or chemical treatments such as etching, electroforming, or precision casting. This is done by molding a molded product using such a mold, and transferring the speckled pattern on the effective surface of the mold to the surface of the molded product. However, in this method, the manufacturing cost of the mold is expensive.

On the other hand, patterns are created by spray painting using pattern paints, which include chip enamel, crystal varnish, vinyl sol pattern paint, crack lacquer, hammertone enamel, and multicolored paints. be.

Of these, the one that seems to be closest to the speckle pattern amount is vinyl sol pattern paint. This vinyl sol pattern paint is made by suspending and dispersing fine powder of vinyl chloride resin, which has a higher degree of polymerization than that used in general paints, in a diluent and plasticizer. When it has partially evaporated, if you spray a thin and even patterning liquid containing a solvent as the main ingredient, only the surface layer of resin will expand, and this will be baked to create a leather pattern or water droplet pattern on the painted surface depending on the recipe. This is what you get.

This method of using vinyl sol pattern paint requires a lot of skill and skill, as the various conditions for creating the pattern are complicated and difficult, and the patterning solution needs to be applied thinly and evenly.

The present invention was made in view of the above-mentioned conventional problems.
Regardless of the type of paint, the present invention aims to easily obtain a speckled pattern by simply specifying the coating conditions.
sec (4 Ford Cups) of paint with a spray atomization pressure of 0.05 to 0.25 kf/-, 0.5 to 1
This is a method of producing a speckled pattern by spray painting, which is characterized by spraying to a coating amount of r/10- to reveal a speckled pattern, and then applying a topcoat.

In the present invention, the substrate to be spray coated may be any material that can be coated, such as synthetic resin or metal.

Paints include oil-based paints, cellulose derivative paints, synthetic resin paints, synthetic resin emulsion paints, etc., and suitable solvents for each include hydrocarbons, esters, ketones, alcohol-containing thinners, or water. Adjust the viscosity before use.

The appropriate viscosity range in the present invention is 18 to 22 seconds (≠
4 Ford cup), and the appropriate range of spray atomization pressure is 0.
05 to 0.25 kg/m, the paint from the spray gun drips in the form of drops, and due to the weak spray pressure, it is applied to the surface to be coated so that it partially overlaps, creating a speckled pattern. It will appear. At this time, the amount of paint adhered is 0. ! M/
When it is less than 10-, the spacing between the spots is too wide and the desired speckled pattern cannot be obtained, and when it exceeds 1 f/1061, the spacing between the spots is too narrow, resulting in many overlapping spots, and this also The desired speckled pattern cannot be obtained.

When the viscosity of the paint is less than 18 sec and more than 22 sec, it is impossible to create a speckled pattern, and when the atomization pressure is less than 0.05 kt/- and 0.25 kg/C
IA? If it exceeds this, it is also impossible to produce a speckled pattern.

Therefore, for a coating amount of 0.5 to lf/10d, the spray atomization pressure is 0.05 to 0.25 kf/- and the paint viscosity is 18
A range of ~22 sec is a necessary condition. Within these ranges, if the viscosity is low and the atomizing pressure is low, the speckled pattern will be thin and rough; if the viscosity is high and the atomizing pressure is high, the speckled pattern will be thick, fine, and coarse. Become.

FIG. 1 is a graph showing the range in which the spotted pattern of the present invention appears, and in this graph, A, B, C, D, E
Each point is made of ABS resin, which is coated with epoxy vinyl resin and hydrocarbon thinner (P50H).
0 indicates a typical sample position when a speckled pattern is formed using a pressure spray coating machine using a paint diluted with thinner (Tanabe Kagakuten).
The At center sample is taken as the sample, and the samples at each vertex of the rectangle indicating the scope of the present invention are shown in B and C, respectively.

D and E, the speckled patterns obtained by each sample were as shown in A, B, C, D, and E in FIG. This 5
The two samples shown are representative, but the overall trend is A? As you move to the right from the center, the spotted pattern gradually becomes larger; conversely, as you move to the left, the spotted pattern gradually becomes smaller; as you move upwards from A, the spotted pattern becomes finer; and conversely, as you move downwards, It was found that the speckled pattern becomes rougher as the pattern increases.In the present invention, by utilizing this property, it is possible to easily create a desired speckled pattern.Next, as shown in FIG. By applying an overcoat 3 on the speckled pattern 2 appearing on the surface of the substrate 1, a beautiful painted pattern surface can be obtained.

The top coat may be formed by appropriately spraying a normal transparent paint, a paint of the same color, or a paint of a different color.

As described above, in the present invention, it is not necessary to use a special mold or a special paint, and it is possible to easily obtain a desired spotted pattern by simply limiting the coating conditions. It can be made of any material, and the material of the base does not matter.
-It can be applied to various fields and its industrial effects are extremely large.Examples will now be described.

An ABS resin plate was prepared as a base, and after degreasing the surface, a cellulose derivative paint (lacquer) adjusted to a viscosity of 20 sec with thinner was applied to the surface at 0.15 yen/-.
The coating was applied at a discarding atomization pressure of about 0.75 f/10-. The paint was scattered on the surface of the substrate in the form of flat convex spots, forming a speckled pattern. This was dried at room temperature (20° C.) for 1 hour.

Next, apply a paint of the same color as the above paint with a viscosity of 17±1 sec.
A top coat was applied at a spray atomization pressure of 3.0 to 3.5 with 9/dk so that the coating weight was approximately: M/10i. This top coat layer was also dried at room temperature in the same manner as above.

In this way, a painted product with an isolated spotted pattern was obtained.

[Brief explanation of the drawing]

Fig. 1 is a graph showing the range of coating conditions of the present invention, Fig. 2 A, B, C, D, and E are graphs showing speckled patterns under typical coating conditions of the present invention, and Fig. 3 is a graph showing the product of the present invention. 0 1...Base 2...Spotted pattern 3...Overcoat Patent applicant Nippon Plast Co., Ltd. Representative Patent Attorney Hide Komatsu #47 - F cuff sec. Fig. 3 1゜1゜

Claims (1)

[Claims] 1. A method for producing a speckled pattern by spray painting, which is characterized in that a paint having a viscosity of 18 to 22 sec (≠4 Ford cup) is sprayed onto the substrate surface at an atomization pressure of O, OS, and then topcoated.