JPS59169577A - Formation of electric conductive corrosion preventive layer capable of carrying out protection from electromagnetic wave or radiant ray - Google Patents

Abstract

PURPOSE:To simply form the titled electric conductive corrosion preventive layer with the small number of steps, by spreading the mixture of a short metal fiber with a powdery metal body of spherical shape larger than the diameter of said fiber through an adhesive layer onto the surface of a structure, and further applying synthetic resin mixed with the second powdery metal body onto said surface. CONSTITUTION:In case of an insulating structure 1 made of concrete, wood or the like, the primer coat 2 of a synthetic adhesive agent is applied onto its surface to execute surface treatment. After the coating is dried, the base coat 3 of synthetic resin is applied onto the rugged surface of the structure 1 to make said surface smooth. After the coat 3 is dried, a tack coat 4 is uniformly applied in a very thin state. The mixture of the first powdery metal body 5 with a metallic short fiber 6 is immediately uniformly applied thereon. Matter having an aspect ratio below 60 is used as said short fiber, while matter habing spherical shape of 7-8 times the diameter of the short fiber 6 is used as the powdery body 5. Thereafter, synthetic resin compounded with the second powdery metal body having spherical shape slightly smaller than that of the powdery body 5 is applied as a topcoat 7 onto said coated surface, to obtain an electric conductive corrosion preventive layer capable of carrying out protection from electromagnetic waves or radiant rays.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for forming an electrically conductive anti-corrosion layer that can protect against electromagnetic waves and radiation, and in particular to a synthetic resin coating method that can be directly formed on the surface of a structure. It is.

Conventionally, in order to prevent the transmission of radiation to the outside or the transmission of electromagnetic waves, metal plates or metal nets have been pasted or buried in structures such as radiation treatment rooms or computer rooms. For this reason, it is possible to affix and bury these metal plates and metal nets in this type of structure, but if the shape of the structure is complex, affixing or burying them is difficult and construction is impossible. was there.

The present invention is a method for forming an electrically conductive anticorrosion layer that does not have these drawbacks and can protect against electromagnetic waves and radiation, in which an adhesive layer is applied to the surface of a structure, and the surface of the adhesive layer has an aspect ratio of 6.
A mixture of short metal fibers of 0 or less and a first metal powder whose spherical diameter is larger than the diameter of the short metal fibers is dispersed, and a synthetic resin blended with a second metal powder is further applied to the surface of the mixture. It is characterized by being applied.

According to the present invention, it is possible to construct a structure provided with an electrically conductive corrosion-protective layer that can protect against electromagnetic waves and radiation easily and in less time than conventional construction methods.

Furthermore, according to the present invention, electromagnetic waves and
It is possible to apply an electrically conductive anti-corrosion layer which can provide radiation protection.

DESCRIPTION OF THE PREFERRED EMBODIMENTS A structure implementing the present invention will be described below.

To carry out the present invention, when the structure 1 is an insulating structure such as concrete or wood, a synthetic resin adhesive primer coat 2 is applied and surface treatment is performed. After drying for about 3 hours, a synthetic resin base coat 3 is applied to smooth the uneven surface of the structure. After further drying, the tank coat 4 is made extremely thin and evenly applied, and a mixture of the first metal powder 5 and short metal fibers 6 is immediately spread thereon evenly. As short metal fibers 6, those with an aspect ratio (ratio of fiber length L to diameter Da: L46) of 60 or more are easily bent and have problems in forming a conductive layer. You must choose one below 60. Further, as the first metal powder 5, the short metal fibers 6
A sphere with a diameter 7 to 8 times the diameter of the ball is preferable. Then, the end portion is glued to the metal powder 5 (3) and the metal powder 5 is
The short metal fibers 6 supported by the open space etc. formed when they are brought into contact with each other are supported at a slight inclination using the metal powder 5 as a pillow, and are chained to form a mesh structure. Therefore, the transmission of electromagnetic waves and radiation is prevented by this part (
(See Figure 2). After the tack coat 4 is cured, the excess short metal fibers 6 and metal powder 5 are removed. Thereafter, a synthetic resin mixed with a second metal powder having a slightly smaller spherical diameter than the first metal powder 5 is applied as a top coat 7. As shown in FIG. 2, this top coat is sufficient to fill in the irregularities between the short metal fibers 6 on the top surface.

Next, examples will be shown. Parts in the examples indicate parts by weight.

Example After cleaning the concrete surface, a primer coat was applied. After air drying for 3 hours, a base coat was applied to adjust the level of the concrete surface, and the concrete was air dried for 12 hours. Thereafter, after applying a tack coat, a mixture of 100 parts of short metal fibers and 100 parts of metal powder was immediately sprinkled on top of the tack coat. This short metal fiber has a diameter of 7
As the metal powder, a hydralium with a diameter of 500 to 600 μm was used. After drying at ℃ for 12 hours, the excess short metal fibers and metal powder were collected, and a top coat of 100 parts of metal powder mixed with 100 parts of synthetic resin was applied thereon, and air-dried for 12 hours. Ta. As the short metal fibers, hydralium with a diameter (b) of 75 μm was used, and as the synthetic resin, epoxy resin or urethane resin was used.

When a low potential corrosion electrode was connected to the formed layer,
The conduction state of the conductive layer was good, and the corrosion prevention effect was also good. □

[Brief explanation of the drawing]

FIG. 1 is a schematic cross-sectional view of a structure formed according to the present invention, and FIG. 2 is a schematic enlarged cross-sectional view showing the state of adhesion of short metal fibers.

Claims (1)

[Claims] An adhesive layer is applied to the surface of the structure, and a mixture of short metal fibers having an aspect ratio of 60 or less and a first metal powder whose spherical diameter is larger than the diameter of the short metal fibers is sprinkled on the surface of the bonded piece. 1. A method for forming an electrically conductive anti-corrosion layer capable of protecting against electromagnetic waves and radiation, the method comprising: applying a synthetic resin containing a second metal powder to the surface of the anti-corrosion layer.