JPS62217901A - Production of rubber boots with paint having retroreflecting body adhered thereto - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION LIL Standing Plate 11 The present invention relates to a method for manufacturing painted rubber boots to which a retroreflector sheet is adhered for the purpose of preventing pedestrians from traffic accidents.

Conventional technology and its problems 1. Recently, in order to prevent pedestrians from traffic accidents, painted rubber boots have been developed in which a sheet-like recursive body is attached to easily conspicuous places such as the leg opening and the back heel. demand is increasing.

Generally, paint-coated rubber boots are produced by applying a rubber paint to a molded unvulcanized rubber boot by dipping or other means, heat-vulcanizing it, and baking the paint to complete the product. When attaching a retroreflector to the surface ■ Glue the reflector sheet before the paint application process, apply masking to the sheet in advance, and then apply the masking material after the paint application and heat vulcanization processes have finished. Peel off.

■After completing the rubber boots (after completing the paint application and heating and vulcanization processes), adhere the reflector sheet.

There are two methods, but in method (2), the 1ζ gluing operation of gluing the reflector through baked rubber paint is not only troublesome, but also causes the appearance quality to deteriorate due to adhesive protrusion. Sufficient adhesive strength cannot be obtained. Therefore, method (2) is much more preferable. However, it has been found that this method (2) has the following problems related to the use of masking material.

That is, when masking a retroreflector, if a solvent-based masking material is used, the solvent corrodes the surface of the reflector and impairs its reflective function.

In addition, the masking material tends to bond strongly with the surface of the reflector during the baking process (heating and vulcanization process for about 60 minutes at about 130°C), so when removing the masking material, the glass globules of the retroreflector This not only destroys the surface layer containing the silica, but also poses a major problem in terms of work efficiency, as the peeling process itself does not proceed smoothly.

In order to eliminate this drawback, the initial adhesion between the masking material and the reflector is kept as weak as possible, but if this is done, there will be a slight difference between the masking material and the reflector during operation. 79J also tends to create gaps, and therefore, when immersed in paint, the paint enters through the gaps, which not only impedes the reflective function but also stains the appearance of the reflector.

In order to solve these problems, the inventors have completed the present invention as a result of repeated experiments in selecting masking materials and various oven-type, closed-type, and semi-closed-type retroreflectors.

Means for Solving the Problem The present invention provides a method for forming a coating on the surface of a retroreflector by forming a coating with a transparent synthetic resin composition having a softening point of 130° C. or higher on the exposed surface of a glass sphere, which is a component of the retroreflector. A retroreflection method characterized by applying masking in advance and adhering it to a predetermined location of a molded rubber boot before vulcanization, applying a rubber paint, and peeling off the masking material after the heating and vulcanization process has finished. This is a method of manufacturing rubber boots with paint on which the body is glued.

The retroreflector that can be used in the present invention is a sheet-like retroreflector (hereinafter simply referred to as a reflective sheet).
The surface structure belongs to the so-called closed or semi-closed type. In other words, in oven-type reflective sheets, since the masking material and the reflective sheet do not have sufficient adhesion, peeling occurs, especially at cut edges, and paint enters in later steps. Furthermore, when the masking material is further heated and vulcanized, it is bonded to the surface layer of the reflective sheet more than necessary, which not only makes it extremely difficult to remove the masking material, but also damages the glass beads on the surface of the reflective sheet. This is because it has a tendency to peel off.

The details will be explained below using the drawings. FIG. 1 is an enlarged sectional view of an example of a reflective sheet used in the present invention. The support 1 is made of woven fabric, nonwoven fabric, etc. made of natural or synthetic fibers. 2 is a single layer of a general-purpose fixed binder. Reference numeral 3 denotes a reflective layer, which is formed by direct metal vapor deposition as is well known, or by a resin layer mixed with a light reflective material such as aluminum powder.

Further, 4 is a small glass sphere having a diameter of 500 μm or less and a refractive index of 2.0 or more.

A coating 5 is formed to cover the exposed front surface of the glass sphere. It has a thickness of 0.01 to 5 μm and is made of colorless or colored transparent resin. These resins have a softening point of at least 1
It is necessary to keep the temperature at 30°C or higher. Softening point is 130℃
If it is below, peeling of the masking material will be hindered. This is probably because the masking material is bonded to the resin coating 5 during the heating and vulcanization process.

Composition of the resin and H method for forming the coating 5 - Examples include a) A transparent resin consisting of 100 parts of alkyl methacrylate Nisder polymer resin, 5 parts of melamine curing agent, and 30 parts of toluene, and the thickness of the coating. After applying the coating to a thickness of 2 μ, hot air drying treatment is performed at 130° C. for 3 minutes.

b) A colored transparent resin consisting of 100 parts of melamine-pormarine polymer resin and 15 parts of benzidine pigment is applied to a thickness of 2.5 μm.

C) - 100 parts of corrugated urethane screen ink clear liquid;
A printing ink consisting of 30 parts of pigment and 210 parts of methyl ethyl keto was prepared, and after screen printing, it was heated at 120°C.
Dry with hot air for 5 minutes to form a film with a thickness of about 3μ.

Details of the structure and optical effects of such coatings are disclosed in, for example, Japanese Patent Application Laid-Open No. 60-64302.

The inventors created a reflective sheet material by previously forming a masking material made of vinyl acetate emulsion to a thickness of about 1.0# on the surface of the reflective sheet on which such a film was formed. This was cut into a belt shape of 1.8 cm x 37 cm, which was then molded and adhered to the unvulcanized rubber of the legs and openings of yellow rubber boots with adhesive. As a result of immersing the sheet material in a paint for baking boots and observing it, it was confirmed that the cut edges of the sheet material were completely adhered to the masking material, and no paint intrusion occurred at all.

Further, this rubber boot molded body was subjected to heat vulcanization treatment (hot air vulcanization; 130° C. 60 minutes, air pressure 3.0 Kg/a+) to vulcanize the rubber and bake the paint on the surface. However, when we peeled off the masking material on the surface of the reflective sheet, we confirmed that the peeling process could be carried out very smoothly without damaging the retroreflective structure on the surface of the sheet.

As a masking material that can be used in the present invention, there can be used an emulsion one-pan type so-called release paint, which is made by using various synthetic resins as film-forming polymers, mixed with plasticizers, stabilizers, etc., and dispersed in water. . The polymers include vinyl chloride, ethylene vinyl acetate, and heat rlJ.
Examples include ffi urethane-based polymers, acrylic ester-based polymers, and the like.

The amount of masking material applied to the reflector is 0.
A value between 1 and 2.0 is good.

Rubber paints that can be used in the present invention include commonly used rubber baking paints containing rubber-modified alkyd resins, vinylized alkyd resins, vinyl resins, polyurethane resins, etc. as main components.

In order to adhere the reflective sheet to the required locations of the rubber boots, strong adhesive force can be easily obtained by applying rubber glue or other conventional adhesive means to the base fabric of the reflective sheet.

The conditions for baking the rubber paint (heating/heating 1) are 100
℃～150℃. 20 minutes to 60 minutes, air pressure in the can 2.0 to 3
．． It is 0Kg/cd.

A specific example of a reflective sheet that can be used in the present invention is a retroreflective material (product number UR) manufactured by Unitika Sparklight Co., Ltd.

As described above, the present invention uses a retroreflector formed by forming a coating with a transparent synthetic resin composition on the exposed surface of a glass sphere, which is a component of the retroreflector. A manufacturing method that involves applying a masking material in advance and adhering it to a predetermined location of a pre-vulcanized molded rubber boot, then applying a rubber paint and removing the masking material after the heating and vulcanization process has finished. Therefore, it has the following effects.

1) Since the initial adhesion between the reflector and the masking material is sufficiently developed, it will not peel up even if it receives an impact during the cutting process or adhesion process, and the paint will not penetrate even if it is immersed in paint. Therefore, the reflective function is not inhibited and the appearance of the reflector is not contaminated.

2) During the baking process of the paint (heating and vulcanization process at about 130°C for about 60 minutes), the adhesion between the transparent resin on the surface of the gaff globule of the reflector and the masking material does not become very strong. Since the surface layer of the reflector, including the glass globules, is not destroyed by peeling off the masking material, the retroreflection effect is completely protected. In addition, the masking material can be removed very smoothly, increasing work efficiency.

3) In the production method of the present invention, after immersion in the paint,
Since the masking material is peeled off from the surface of the reflector, the outline of the reflector will clearly appear on the surface of the rubber boots, so it will not be difficult to apply the masking material after the finish (after the paint has burned off). The adhesive does not protrude or the like and the product has extremely high commercial value.

4) In the manufacturing method of the present invention, the exposed surface of the glass sphere, which is a component of the retroreflector, is coated with a transparent resin, so the life of the retroreflection function is long, and dirt caused by use can be easily wiped off. be able to.

5) In the present invention, the masking material does not necessarily have to be peeled off during the manufacturing process, but when the product is transported to a retail store,
Alternatively, it can be easily carried out in the hands of spiritual practitioners. In this way, the V of the reflector during transportation
A: It is effective in preventing scratches.

[Brief explanation of drawings]

FIG. 1 is an enlarged sectional view of an example of a retroreflector used in the present invention. 1...Support 2...Binder layer 3...
Reflective layer 4...Glass spheres 5...One or more coatings

Claims (1)

[Claims] A masking material is applied in advance to the surface of a retroreflector, which is formed by forming a coating of a transparent synthetic resin composition with a softening point of 130°C or higher on the exposed surface of a glass sphere, which is a component of the retroreflector. Comes with a paint that has a retroreflector adhered to it, characterized in that it is adhered to a predetermined location on a molded rubber boot before curing, then a rubber paint is applied, and after the heating and vulcanization process is complete, the masking material is peeled off. How to make rubber boots