JPH01273003A - Photorecurrent paint - Google Patents

Abstract

PURPOSE:To easily obtain a photorecurrent reflector by mixing photorecurrent fine spheres into a binder and solvent. CONSTITUTION:The photorecurrent reflecting elements, i.e., glass beads, binder, plasticizer, and solvent stabilizer are charged into an agitating tank 2 from a hopper thereof and are subjected to premixing. The photorecurrent paint 5 prepd. by filtering foreign matter and lumped photorecurrent paint with a filter device 4 and mixing the same in a mixing stage is then put into a container 6. A base film 1 let off from a feed roll 9 is supplied between a gravure roll 7 and a back roll 8 in the container 6. The photorecurrent paint 5 on the film base 1 subjected to the coating and drying stages is calendered at need by calender rolls 14 and thereafter, the base film is taken up on a take up roll 15, by which the photorecurrent reflector is formed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a photoregressive paint suitable for use in a photoregressive reflector.

[Summary of the invention]

The present invention relates to a photoregressive paint suitable for use as a photoregressive reflector, and by mixing photoregressive microspheres into a binder and a solvent, the photoregressive reflector can be formed by printing or coating. It is something.

[Conventional technology]

Conventionally, as a method of manufacturing a photorecurrence reflector, for example, a method of arranging photoregression microspheres on a sheet was disclosed in Japanese Patent Laid-Open No. 5
5-65524.

FIG. 4 is a process diagram for arranging photoregressive microspheres on a sheet as shown in this publication.

First, as shown in Figure 4, this is a foamable synthetic resin.
The back side of (21a) is lined with a suitable base material (21b). Next, in order to form irregularities on the surface of the foamable synthetic resin, an uncolored binder (22) containing a foaming inhibitor is applied to the concave positions, and transparent microspheres (24), which will be described later, are applied on top of this. Apply an adhesive layer (23) thinner than the diameter.

In the next step, as shown in Figure 4B, transparent microspheres (such as glass beads) with a diameter of 80 microns and a refractive index of 1.9 are
(24) to semi-gelatize the adhesive layer (23), and then cover the bottom of the transparent microspheres (24) with foamable synthetic resin (
21a) Push upward.

In the next step, as shown in FIG. 4C, a foaming heat treatment is performed to foam the foamable synthetic resin layer (21a). In this case, the areas coated with the non-colored binder (22) containing a foaming inhibitor are suppressed from foaming and become concave, and the areas not coated are foamed and become convex and concave and convex sheets.
) are arranged in a --like manner, and a light-recurring reflective sheet is obtained in which incident light from any direction is uniformly reflected in the incident direction.

[Problem to be solved by the invention]

According to the conventional structure of cooking, glass peas (
24), but there is a problem in that it cannot be easily printed or coated on various objects such as roads, roofs, and curved surfaces. Furthermore, it was difficult to pattern it into a predetermined shape.

The present invention was developed in view of the cooking process, and its purpose is to provide a photoreactive paint that can be easily applied to any object.

[Failure to solve the problem]

The present invention is a photoregressive paint in which photoreturnable microspheres are mixed into a binder and a solvent.

[For A] Since the photoregressive paint of the present invention is made by mixing photoregressive microspheres in a binder and a solvent, it is very easy to form photoregressive repellents by printing or coating this photoregressive paint. can be obtained.

〔Example〕

Hereinafter, the manufacturing method and coating method of the photoregressive paint of the present invention will be explained. The photoregressive transparent microspheres mixed in the photoregressive paint of this example are glass beads (24) with an average diameter of 20~
Specific gravity 2.2-3.6 at 100 microns, refractive index 1.5
It is about ~2.0. As the binder, transparent paste-like synthetic resins such as vinyl chloride resin, acrylic resin, and vinyl chloride-vinyl acetate copolymer resin can be used. Of course, vinylidene chloride resin or vinyl fluoride resin may be used to make the binder weather resistant, but it is better to select a binder that cuts easily and does not leave any binder on the surface of the glass beads after the solvent described later is evaporated. shall be. In addition, if the refractive index of the binder is selected to be approximately the same as the refractive index of glass beads, for example, 1.5 to 2.0, a binder suitable for taking out an image placed on the back surface of the light-recurring reflector can be obtained. It will be done. Alternatively, if the refractive index of the binder is selected to be 1, which is close to that of air, the influence of the binder remaining on the surface of the glass beads can be ignored.

Although the mixing ratio G/B of transparent microspheres, glass beads G and binder B can be selected to be about 2.5, it is possible to reduce the ratio of glass beads to binder and spread glass beads over the entire coating surface. Depending on the application, there are light-recurring reflectors in which the glass beads are not spread over each other but have a predetermined spacing between them, so this G/B ratio can be selected as appropriate. Furthermore, by selecting properties such as the specific gravity of the binder, it is possible to make the glass beads precipitate during coating so that they line up in a row on the coating substrate, or to arrange the glass beads closely together (or at a predetermined distance). You can also do it.

EnP is used as a plasticizer, but nDOP is also used as a plasticizer.
(dieta-octyl fuculate), former UP (iso-octyl fuculate), etc. may also be used. Further, as a dispersant and a solvent for keeping the glass peas in a dispersed state as a paint for a long period of time, for example, lecithin, methyl ethyl ketone, butyl acetate, etc. may be used.

An example of applying the photoregressive paint according to this example onto a substrate will be described below.

Example 1 Light regression reflective element, glass beads 100 parts by weight (diameter 70μ, refractive index 1.9) Binder: PVC system (VAGH manufactured by ICC) 4
0 parts by weight Solvent: Methyl ethyl ketone/butyl oxide 300
Part by weight (1°1) Plasticizer: DOP (cyoquidyl butanoate) 1 part by weight Dispersant, lecithin 1 part by weight Each material in the proportion shown in Example 1 was sufficiently stirred in a stirring tank for 20 hours to prepare a substrate. A piece of paper was selected, and the mixed photoregressive paint was directly applied to a thickness of 100 μm and dried. The light regressive reflector obtained in this way was irradiated with light and the reflected light was examined.
A property comparable to that of the conventional example shown in FIG. 4 was obtained.

Next, an example of automatically applying a photoregressive paint to a film base according to the present example will be explained with reference to FIG.

Example 2 Binder: PVC system ([IC[', V Y l (H
) 40 parts by weight Plasticizer: DOP (dioctyl butanoate) 1 part by weight Dispersant: lecithin
1 part by weight stabilizer zinc nistearate
1 part by weight of the photoregressive reflective element, namely glass beads, binder, plasticizer, dispersant, solvent, and stabilizer in the proportions of Example 2,
The mixture is charged from the hopper of the stirring tank (2) shown in the first diagram, and premixing is performed. Next, in order to further mix the photoregressive paint in the stirring tank (2), a kneader (3) is used to sufficiently mix the photoreactive paint in the stirring tank (2), and a filter (4) is used to remove foreign substances and lumps of the photoreturnable paint. After filtering and completing the mixing process, the mixed photoregressive paint (5) is placed in a container (6). Supply roll (
9) The base holder (1) that is drawn out from the container (
6) Gravure roll (7) and Noku Tsukuro (8)
) supplied between. Here, a photoregressive paint (5) is applied to the surface of the base film (1).

Next, a smoother (11) scrapes off the glass beads applied on the surface of the film base (1) so that the glass beads are lined up in a single layer, and the glass beads are passed through a dryer (12) to volatilize the solvent (13). After the coating and drying process, the photoregressive paint (5) on the film base (1) is calendered with a calendar roll (14) if necessary, and then wound onto a take-up roll (15). A light recursive reflector is constructed. By appropriately cutting the base film (1) of such a photoregressive reflector and pasting it on the subject, most of the light beam incident on the photorecurrence reflector can be returned to the emission position. This makes it possible to use it widely for the detection of various analytes.

Another method is to send out a light beam from an aircraft and detect the reflected light from a photoregressive paint applied directly to a runway, the roof of a control tower, a high mountain, a part of a chimney, etc. The light-receiving element on the aircraft side can receive almost the transmitted beam as it is, making it extremely easy to guide the aircraft and detect dangerous objects.

Figure 2 shows a method of printing the photoregressive paint (5) of the present invention on a test object or substrate (16), and shows a method of printing the photoregressive paint (5) of the present invention on a test object or a substrate (16).
17) is tensioned and fixed to create a film from which the pattern to be printed is removed on the stencil screen (18). For example, a bar coat pattern as shown in FIGS. 3A and 3B is prepared. Next, place a photoregressive paint (5) similar to that shown in Example 2 on the stencil screen (18), move the squeegee (20) consisting of a plate-shaped rubber spatula in the direction of the arrow, and the substrate ( 16) is printed with a photoregressive paint (5).

Figure 3A shows photoregressive paint [5] on a black substrate (16).
is printed, and the printed photoreactive paint (19) constitutes the bright part of the barcode. A black substrate (16) forms a dark area (25) that does not reflect incident light. When the scanning beam (26) is incident on this barcode, in the bright part of the barcode, the glass beads reflect light (26) approximately in the direction of incidence.
7), the power of the effective reflected light becomes extremely large. FIG. 3B does not show a negative type barcode in which the bright and dark areas (25) of FIG. 3 are reversed. The upper photoregressive paint can be directly coated or printed on the subject when obtaining the photoregressive reflector, so the photoregressive reflector can be obtained extremely easily. In the above-mentioned embodiments, a method of applying a photoregressive paint directly to a test object or a film base, and a screen printing method were explained, but it is also possible to print a barcode by photo-etching. Moreover, the printing surface can be applied to various surfaces such as curved surfaces, flexible surfaces, and solid surfaces.

Furthermore, the transparent microspheres are not limited to glass beads, and those made of acrylic resin may also be used.

Note that the present invention is not limited to the cooking example and can be modified in various ways.

〔Effect of the invention〕

A photoregressive reflector can be easily obtained by simply applying or printing the photoreturnable paint according to the present invention.

[Brief explanation of the drawing]

Fig. 1 is a coating process diagram showing an example of applying the photoreactive paint of the present invention, Fig. 2 is a principle diagram of screen printing of the photoreactive paint of the present invention, and Fig. 3 is a photoregressive paint of the present invention. FIG. 4 is a perspective view showing a barcode pattern formed with paint, and is a manufacturing process diagram of a conventional light-recurring reflector. (1) is a film base, (5) is a photoregressive paint, (1)
9) is a printed photoregressive paint. Agent Mamukai Ito
Hide Matsukuma 21b

Claims (1)

[Claims] A photoregressive paint made by mixing photoregressive microspheres into a binder and a solvent.