JPS62254879A - Coloring method - Google Patents

Abstract

PURPOSE:To easily obtain diversified coloring states by sealing a color former and coloration inducing agent in the state of isolating the same by a hot- meltable resin into a microcapsule and mixing the same by heating, thereby forming the color. CONSTITUTION:The color former 4 is sealed between the microcapsule 2 formed by a transparent heat resistant resin and the microcapsule 3 formed of the hot-meltable resin sealed therein and the coloration inducing agent 5 is sealed into the microcapsule 3. A color forming layer is then formed at a prescribed thickness on the surface of the base material 6 and the color forming particle 1 in the layer 7 are heated by a laser, etc. Then, the temp. of the microcapsules 2, 3 of the particle 1 increases and the color former 4 and the coloration inducing agent 5 are brought into the mixed state. The diversified colored states are thus easily obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a coloring method in which color is developed by heating.

(Prior Art) For example, in order to color the surface of a substrate such as a steel plate, it is common to apply a paint of a predetermined color to the surface of the substrate and dry it.

However, when using such paints, for example, in order to make part of the surface of the base material colored and the rest transparent or colored in a different color, it is necessary to apply the two paints separately. It is necessary and the work is troublesome.

In addition, when manufacturing multiple types of steel sheets colored in different colors on the same painting line, first paint the first color, then thoroughly clean the coating equipment and apply the second color. It was necessary to carry out a color change operation by supplying paint, and then move on to the next painting, which was still quite a tedious task.

(Problems to be Solved by the Invention) In other words, in the conventional coloring method, a paint with a predetermined color is applied, so there remains the problem that it is not possible to flexibly respond to diversification of color appearance. It had been done.

The present invention has been made to solve the above problems, and therefore, its purpose is to provide a coloring method that can easily obtain various coloring states.

[Structure of the invention]

(Means for Solving the Problems) The 11-color method of the present invention consists of encapsulating a coloring agent and a coloration inducing agent in microcapsules in a state where they are separated by a heat-melting resin, and forming coloring particles. A coloring layer formed by mixing coloring f1'1 particles into a binder is formed on the surface of the base material, and the coloring agent and coloring inducing agent are mixed by melting the heat-melting resin by heating the coloring particles. The feature is that it is colored.

(Function) To color the surface of a substrate, first, a coloring layer is formed on the surface of the substrate by mixing coloring t+ particles in a binder, and then the coloring particles are heated, for example, by laser irradiation. The heat-melting resin is melted by heating, and the coloring agent and coloring inducing agent in the microcapsules are mixed and colored, so that the irradiated area becomes 411 colors.

(Embodiment) An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

First, in FIG. 1 showing coloring particles 1, 2 is a microcapsule formed from a transparent heat-resistant resin, and 3 is a microcapsule formed from a heat-melting resin sealed inside. A coloring agent 4 is sealed between the microcapsules 2 and 3, and a coloration inducing agent 5 is sealed inside the microcapsules 3, thereby forming the coloring particles 1. The coloring agent 4 and the coloring inducing agent 5 of the coloring particles 1 are separated by the heat-melting resin. In particular, in this example, there are four types of coloring particles f'
The color forming agent 4 and color development inducing agent 5 in each color forming particle 1 are arranged in the following four combinations.

The first is a combination of divalent di-soquer salt and dimethylglyoxime, which develops a red color when mixed and reacted. The second is trivalent chromium salt and sodium hydrogen phosphate (Na2
When mixed and reacted in combination with HPOa), it develops a green color. The third is a combination of divalent iron salt and potassium ferricyanide (K3[Fe(CN)a]), which develops a blue color when mixed and reacted. Also,
The fourth is divalent cobalt salt and ammonium sulfide ((NHa
)2S) When mixed and reacted, a black color develops. In addition, the microcapsules 3 used in each coloring particle 1 have different melting temperatures, and specifically,
The melting temperature of the microcapsules 3 of each coloring particle 1 containing the first to fourth combinations of the coloring agent 4 and the coloring inducing agent 5 is Tr.

If Tg, Tb, Tbl, Tr < Tg < Tb
The relationship is set to be <Tbl. These four types of color development I7 have an extremely small diameter and are uniformly dispersed in a binder made of a transparent slimy resin, as shown in Figure 2. A coloring layer 7 is formed by coating the surface of a base material 6 such as a steel plate with a predetermined thickness. For the sake of distinction,
They are indicated by the symbols ○, △, ◎, and ・, respectively.

Now, after forming two coloring layers 7 on the surface of the base material 6, when laser is irradiated to the areas where six colors are desired, each coloring particle 1 in the coloring layer 7 is heated by the laser. As a result, the temperature of the microcapsules 2 and 3 of the color-forming particles 1 rises, and the microcapsules 3 made of heat-melting resin that isolate the color-forming agent 4 and the color-development inducing agent 5 are melted and the color-forming agent 4 and the microcapsules 3 are separated from each other. The mixture is mixed with the color development inducing agent 5 (see FIG. 3).

As a result, since the two halves 4.5 react and develop color, only the laser irradiated portion of the coloring layer 7 becomes colored. Therefore, according to this embodiment, the partial j'? Colors can be changed freely, and if the laser irradiation position is moved in a predetermined pattern, characters, figures, etc. can be freely drawn. In particular, in this embodiment, four types of coloring particles 1 are provided for coloring red, green, blue, and black, and the melting temperatures of the microcapsules 3 of each coloring particle 1 are set to increase in the same order. Therefore, the desired color can be selected by appropriately setting the laser irradiation time or irradiation output. That is, for example, the longer the laser irradiation time, the higher the temperature of the microcapsules 3, so the lH degree is the melting of the microcapsules 3 with a red coloring t☆! When the irradiation time was kept at 4 degrees Tr, the laser irradiation part was colored red, and the irradiation time was made longer so that the temperature of the microcapsules 3 reached the temperature Tg. In this case, only the microcapsules 3 of the red and green colored particles 1 are melted, so that the laser irradiated area is colored in a mixture of red and green. Therefore, by making the laser irradiation time longer in the same way, red,
It can also be colored in mixed colors of green and blue as well as black. Note that the portion that is not irradiated with the laser remains the color of the binder resin (transparent in this example).

The structure of the colored particles is not limited to that shown in FIG. 1, but may be as shown in FIG. 4.

Here, the difference from the structure 14 shown in FIG. The coloring particles 1 are constructed by encapsulating them in microcapsules 10 consisting of the following:
The inner microcapsules 8.9 are melted by the laser irradiation, and as shown in Figure 5, the two halves 4 and 5 become mixed and colored, so only the laser irradiated part is in the j'i color state. become.

Historically, the structure of the coloring layer 7 is not limited to that shown in FIG. 2, but may be the structure shown in FIG. 6 or 7. FIG. 6 shows a structure in which four types of coloring particles 1 are coated in four layers in a state in which various types of particles are mixed with a binder. Further, FIG. 7 shows a structure in which coloring particles 1 of 4f·t are coated in one layer so as to form one set in close proximity to each other.

In addition, as a heating method for the color forming particles 1, for example, electron beam irradiation, instead of laser irradiation as in the above embodiment,
Heating may be performed by infrared irradiation or heating using a heating furnace.

Furthermore, the present invention is not limited to mixing a plurality of types of coloring particles as described above, but may include mixing only coloring particles of type 18 that develop a specific color into the binder. In this case, for example, if the third combination of coloring particles that produce blue color and a yellow pigment are mixed in advance into the binder, a coloring layer is formed on the surface of the base material without heat treatment. In this case, the base material is colored yellow, and when the heat treatment is performed, the colored particles develop a blue color, so that the base material is colored green, which is a mixture of yellow and blue. Therefore, the coloring layer No. 11 is applied continuously to the surfaces of many substrates on the same painting line, and after that, the substrates to be colored yellow are not heat-treated, and the substrates to be colored green are not subjected to heat treatment. If heat treatment is performed, two types of base materials with different colors can be produced without any color changing work in the coating equipment.

In addition, the present invention is not limited to the above embodiments, and after forming the coloring layer of the present invention on the surface of paper as a base material, a thermal head is applied to the coloring layer to form a predetermined pattern. If it is configured to heat, it can be used as thermal recording paper for facsimile machines and printers, and it can also be made into multiple colors.

[Effects of the Invention] As described below, the present invention includes coloring particles encapsulated in microcapsules in which a coloring agent and a coloration inducing agent are separated by a heat-melting resin, and the heat-melting resin is heated. Since the two halves are melted and colored in a mixed state, it is possible to easily obtain various colored states.

[Brief explanation of drawings]

Figures 1 to 3 show an embodiment of the present invention; Figure 1 is a cross-sectional view of coloring particles, Figure 2 is a cross-sectional view of a coloring layer together with a base material, and Figure 3 is a state in which color has been developed by heating. FIGS. 4 and 5 are views corresponding to FIGS. 1 and 3 showing modifications of the coloring particles, and FIGS. 6 and 7 show different modifications of the coloring layer, respectively. This is a diagram equivalent to Figure 2. In the drawings, 1 is a coloring particle, 2 is a microcapsule, 3 is a microcapsule (heat-melting resin), 4 is a coloring agent, 5 is a coloring inducer, 6 is a base material, 7 is a coloring layer, 8.9 is a micro It is a capsule (heat-melting resin).

Claims (1)

[Claims] 1. Construct coloring particles by encapsulating a coloring agent and a coloring inducer in microcapsules while separating them with a heat-melting resin, and apply a coloring layer formed by mixing these coloring particles into a binder to the surface of a base material. A coloring method characterized in that the coloring agent and the coloring inducing agent are mixed and colored by melting the thermofusible resin by heating the coloring particles.