JPH03232574A - Coating method for water permeable and soft magnetic marker body - Google Patents

Abstract

PURPOSE:To obtain a function as a safe magnetic guiding system without impairing a water permeable function by mixing a flat flaky soft magnetic alloy powder with a binder, i.e., a coating material and spray coating this mixture onto a permeable pavement surface. CONSTITUTION:The coating material is prepd. by mixing the flat flaky powder of the alloy selected from a crystalline alloy consisting, by weight, of 6 to 10% Si, 2 to 7% Al, and the balance Fe and unavoidable impurities, a crystalline alloy consisting of 40 to 80% Ni, and the balance Fe and unavoidable impurities and a crystalline alloy consisting of 40 to 80% Ni, 2 to 6% Mo, and the balance Fe and unavoidable impurities with the hinder (e.g. epoxy resin). This material is spray coated on the permeable pavement surface. Consequently, the easy application is possible and the function as the stable magnetic guiding system is obtd. without impairing the permeable function.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for coating a water-permeable soft magnetic marker for a magnetic induction system used for road surfaces, enclosures in amusement parks, floors, etc. Specifically, the present invention relates to a method of coating a soft magnetic sign by mixing flat flake-shaped soft magnetic alloy powder with a binder, ie, paint, and spraying the mixture onto a water-permeable pavement surface.

(Prior art) A magnetic induction system has been devised that guides people and cars by using soft magnetic materials as magnetic signs and detecting them with magnetic sensors. etc. are installed.

Especially when installed outdoors, such as on a golf course or on a road, magnetic signs are inexpensive and highly reliable, and they are also water-permeable so that the painted surface will not exhibit defects such as poor drainage immediately after rain or slippery. It is hoped that the quality of the product will be good.

Conventional magnetic markers are disclosed in Japanese Utility Model Application No. 61-14905, and are made by solidifying and molding ferrite powder with one or more binders such as various asphalts and resin emulsions;
A method of using soft ferrite powder or a sintered body thereof in the form of a paint or sheet is disclosed. Generally used ferrite has excellent corrosion resistance, but has low magnetic permeability, so it is necessary to use a large amount to increase the magnetic permeability and solidify it, so if it is mixed with paint and painted to make a magnetic sign, Since the identification is done by a sensor, the marker becomes thick and has poor water permeability. For this reason, it is difficult to use on roads where water permeability is essential. It is desired to develop a magnetic marker that can be easily painted and has water permeability.

(Problems to be Solved by the Invention) The present invention uses a soft magnetic alloy with high magnetic permeability and sprays it on the water-permeable pavement surface, thereby making it possible to easily install the magnetic induction system without impairing the water-permeability function. The purpose of this invention is to provide a method for coating soft magnetic markers that activates
Furthermore, spraying provides a method for coating a soft magnetic marker that increases the durability of the soft magnetic marker by applying a paint onto the coated soft magnetic marker, and a coating method that uses acrylic resin, urethane resin, or epoxy resin as the paint. It is something to do.

(Means for Solving the Problems) As described above, in order to obtain a water-permeable magnetic marker that eliminates the drawbacks of ferrite conventionally used as a magnetic marker, the following method is adopted in the present invention. In general, a permeable road surface is made of aggregate made of crushed stone or natural stone, the size of which is about the same size as a stone, and is hardened with a weather-resistant binding material such as asphalt or epoxy resin. If this is coated with a paint containing ferrite, which is a soft magnetic material, or a soft magnetic sheet, the water permeable surface will be covered with it, causing a blockage and loss of water permeability. As a result of our investigation, we found that when forming magnetic markers on permeable roads, floors, and enclosures in amusement parks, if the permeable surfaces are painted using roller coating, brush painting, or troweling, the permeable surfaces will become clogged. When it rains, water covers the painted surface and impairs water permeability, but if a soft magnetic alloy powder with high magnetic permeability and a flat flake shape is mixed with a binder and sprayed on the permeable surface, the water permeability is lost. I learned that it is possible to paint magnetic markers without having to paint them. Soft magnetic alloys with high magnetic permeability to be used include Fe-5t-AN, F
Crystalline alloys such as e-Ni-Mo and Fe-Ni systems, or amorphous alloys of Fe and Go systems can be used, but in particular Si 6 to 10%, Al 12 to 7% by weight, the balance Fe and unavoidable Alloy consisting of impurities, Ni40~80%, balance consisting of Fe and inevitable impurities, and Ni48~
It is preferred to use an alloy consisting of 80%, M02-6%, the remainder Fe and unavoidable impurities. The alloy used has a thickness of 1~
It is used by processing it into flat flakes with a thickness of 5μ and a thickness to length ratio of about 1:5 to 200.

These flakes are mixed into acrylic resin, urethane resin, epoxy resin, petroleum resin, rosin-modified maleic acid resin, fluororesin, silicone resin, acrylic urethane resin, acetic acid-ethylene copolymer resin, acetic acid-beehoba copolymer resin, preferably acrylic resin. , a solvent-free liquid resin selected from urethane resin, epoxy resin, silicone resin, acrylic urethane resin, vinyl acetate ethylene resin, and vinyl acetate resin,
Mix it with a solvent-based or water-based binder and spray paint it on the water-permeable pavement surface using an air spray, near compressor, hot spray, air spray, reshin gun, etc. The amount of flaky alloy mixed in the binder is preferably as large as possible, and the amount of coating is determined by the detection ability of the intended magnetic marker and the coating thickness, but compared to conventional ferrite markers, the amount of coating is It only needs to be thin. For painting, when using a spraying machine, for example, a Shingun, multi-layer coating is performed using an undercoat and a topcoat several times at a diameter of 4 to 6III and an air pressure of 4 to 6 kg/af. The combination of the undercoat and topcoat in the paint is selected based on the adhesion to the substrate, the glabellar nature of the undercoat and topcoat, and the combination that increases the water permeability coefficient.

In the present invention, since a soft magnetic alloy with high magnetic permeability is used, the coating thickness can be thinner than that of conventional ferrite markers, and since the soft magnetic alloy is in the form of flat flakes, the soft magnetic properties are good. It is mixed relatively parallel to the coating layer. Therefore, the apparent magnetic permeability is improved, and the amount of alloy powder used can be significantly reduced. In addition, the paint viscosity of the binder containing flake powder is 60-120 KU, 20°
C exhibits good thixotropy, the TI value is expressed in the range of 5 to 10, and the paint is suitable for spraying.

(The TI value was determined by leaving the paint at 20°C for 24 hours, using a B-type viscometer using Nα40-ter, and measuring 6rpta and 60rpta.
The viscosity was measured after stirring at a+ for 1 minute, and the value was calculated using the following formula.

The present invention will be specifically explained below with reference to Examples.

Various soft magnetic alloys in the form of flat flakes were mixed with various binders and sprayed onto the surface of the permeable channel as an undercoat. The permeable waterway surface is made by creating a 5-10 cm sand layer on the roadbed, creating an approximately 10 cm roadbed made of tararasharan on top of it, and forming a permeable asphalt concrete layer as a surface layer on top of it. The asphalt concrete layer is made of 70% No. 6 crushed stone.
, consisting of 10% No. 7 crushed stone, 11% sand, 4.5% stone powder, and 4.5% asphalt, and has a hydraulic conductivity of 4.0 to 8.0 x 1.
Various binders were sprayed as a top coat at 0-" as/sec. Experimental conditions used in each experiment Type of alloy and binder, alloy content of binder used as paint, coating pressure, amount of coating, coating The method and the water permeability coefficient of the coated surface of the soft magnetic label obtained are shown in Table-■.For comparison, the conditions of roller brush coating and the obtained The water permeability coefficient of the painted surface is shown in Table-■.

The permeability coefficient is provided by the Japan Road Association.

Pavement Test Method Handbook: Measured using the water permeability test method for water permeable asphalt mixtures.

The water permeability coefficients obtained in Examples 1 to 3 are the standard value 1. OX 10-” (111/sec
The above results indicate that sufficient water permeability is obtained.

FIG. 1 shows a cross-sectional view of the coating system according to the present invention, and Example 1
Figure 2 shows a performance comparison between the labeled product obtained by the method and the ferrite labeled product.

(Effects of the Invention) By forming soft magnetic ISM bodies on permeable pavement surfaces such as roads, floors, and enclosures in amusement parks according to the present invention, visually impaired people can be guided, and water drainage immediately after rainfall is significantly improved. At the same time, the risk of slipping can be eliminated, and a safe function as a magnetic induction system can be obtained.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of the construction of a magnetic marker according to the method of the present invention. FIG. 2 is a graph comparing the performance of the labeled body according to Example 1 and the ferrite labeled body. 1...Soft magnetic undercoat, 2...Top coating, 3...Gap, 4...Water permeable pavement

Claims (3)

[Claims] (1) By weight, Si 6-10%, Al 2-7%, remaining F
Crystalline alloy consisting of e and inevitable impurities, Ni40~
Flat flake powder of an alloy selected from a crystalline alloy consisting of 80% Fe and unavoidable impurities and a crystalline alloy consisting of 40 to 80% Ni and 2 to 6% Mo, the remainder Fe and unavoidable impurities is mixed in a binder. A method for coating a water-permeable soft magnetic marker, characterized in that it is made into a paint and spray-painted on a water-permeable pavement surface. (2) The coating method according to claim (1), wherein a binder is further spray-coated on the spray-coated soft magnetic marker. (3) The coating method according to claim (1) or (2), wherein the binder is a resin emulsion selected from acrylic resin, urethane resin, and epoxy resin.