JPS5931807B2 - Gas adsorption material for relays - Google Patents

Description

Detailed Description of the Invention The present invention provides a relay that can adsorb organic gas floating in the atmosphere of the relay and prevent the formation of an organic insulating film on the contact surface of the relay, thereby improving the reliability of the contact. The present invention relates to gas adsorption materials for use in gas adsorption.

Relay For example, in a polarized relay such as shown in FIG. An organic insulating film is formed on the surface.

In order to prevent the formation of such an organic insulating film, the movable contact 7
It is conceivable to form a gas adsorption layer on the surface of the relay part 1, such as a permanent magnet, which is installed to operate the relay, to adsorb organic gas.

Therefore, the present applicant previously filed a patent application for an adsorbent material in which adsorbent particles such as activated alumina and molecular rubber are dispersed and adhered to a magnet using an organic adhesive.

However, after applying the organic adhesive mixed with adsorbent particles on the magnet, it is necessary to polish the surface to expose the adsorbent particles on the surface, and it is necessary to embed the adsorbent particles in the organic adhesive. It involved a complicated process.

It has also been found that organic gas is also generated from the resin constituting the organic adhesive for adhering the adsorbent particles, which tends to cancel out the effect of the adsorbent particles.

The present invention has been made in view of these drawbacks, and its first purpose is to simply coat and harden the surface of a relay component such as a permanent magnet, without any post-processing such as polishing. The second object of the present invention is to provide a gas adsorption material for relays that can be obtained through a simple process, and a second object is to provide a gas adsorption material for relays that does not generate organic gas.

In addition to the above objectives, the third objective is to provide a gas adsorbing material for relays that has a large adsorption amount of organic gas, and the fourth objective is to provide a gas adsorbing material for relays that can be obtained by a variety of means. There is something to do.

The present invention will be explained in detail below.

The gas adsorption material for a relay according to the present invention, as shown in FIG. 2, is one in which an inorganic adhesive layer 2 containing metal oxide sol as a main component is formed on the surface of a relay component 1 such as a permanent magnet.

The inorganic adhesive mainly composed of metal oxide sol used here has a high viscosity of, for example, 5,000 to 10,000 c, p.
It has high adhesive strength and can be diluted with water or the like, and the film thickness can be increased to about 1 mm.

Further, the formed inorganic adhesive layer is porous to some extent, has a large adsorption surface area, and can adsorb a large amount of organic gas.

Examples of the metal oxide sol contained in the inorganic adhesive layer include alumina sol, silica sol, zirconia sol, and titania sol.

Furthermore, since the above-mentioned inorganic adhesive has a high adhesive strength, adsorbent powders such as activated alumina, molecular sieve, activated carbon, and silica gel can also be mixed therein.

In FIG. 3, an inorganic adhesive layer 2 mixed with such an adsorbent powder 3 is formed on the surface of the relay part 1, but in this case, the amount of organic gas adsorbed becomes even larger.

At this time, it is thought that the organic gas passes through the porous inorganic adhesive layer and is adsorbed by the adsorbent particles.

In this case, an adsorption layer may be formed by applying water glass to the surface of the relay component in advance and applying adsorbent powder thereon.

It is preferable that the amount of adsorbent powder added to the inorganic adhesive is about 10 to 50% by volume.

In the present invention, in order to form the above-described inorganic adhesive layer on the surface of the relay component, the inorganic adhesive may be applied by brushing, spraying, thick film printing, or the like.

The gas adsorption material for relays of the present invention can be particularly preferably used for low capacity relays.

Although it is conceivable to form a layer of the metal oxide sol itself on the surface of the relay component, this is not preferred for the following reasons.

Metal oxide sols such as alumina sol and silica sol have been used for surface treatment, catalysts, etc., but 50C1
P, due to its low viscosity, when applied macroscopically, fine particles of alumina and silica are aggregated here and there, and the particles themselves are 50 to 200 m'/
Despite having a large surface area g, the overall surface area is small.

Therefore, the amount of gas physically adsorbed is small in proportion to the surface area.

Moreover, the adhesive strength of the sol alone is low and it is easy to separate from the convex surface after application.

Furthermore, when mixed with water glass to increase adhesive strength, the surface of the sol is covered with water glass, and since water glass is difficult for organic gases to pass through, the adsorption amount becomes small.

In the present invention, since an inorganic adhesive layer is formed, it can be obtained through a simple process by simply applying it to the surface of the relay component and curing it, eliminating the need for post-processing such as polishing. No organic gas is generated from the

In addition, the amount of organic gas adsorbed is large, and the formation of an organic insulating film on the surface of the relay contact can be effectively prevented.

Moreover, there is an advantage that the inorganic adhesive layer can be formed by selecting from a wide variety of methods such as brushing, spraying, and thick film printing.

Hereinafter, the present invention will be specifically explained with reference to Examples.

<Example 1> An inorganic adhesive mainly composed of alumina sol (Aron Ceramic D type) was diluted with water to 5Vo1%, and Ba
Coated on top of ferrite magnet, then heated at 150℃ for 30 minutes.
It was dried in the air for a minute and used as an adsorption material.

<Example 2> Inorganic adhesive mainly composed of alumina sol and silica sol (
Sumiceram S-1OA) was diluted with water to 10 VoA%, made into a thickness of 10 to 20 μm using a screen printer, and printed on Ba ferrite.

Thereafter, it was dried in the air at 100° C. for 30 minutes to obtain an adsorption material.

<Example 3> After coarsely pulverizing activated alumina as an adsorbent with a pulverizer,
The particle size was adjusted to 1 to 10 microns using a crusher.

This powder is placed in an inorganic adhesive (Sumiceram S-1OA) containing alumina sol and silica sol as main components at a voltage of 10 to 50V.
7% o was mixed in and uniformly dispersed in a ball mill for about 10 minutes.

The obtained slurry-like adhesive cut is printed on a screen printing machine for 10 to 2 hours.
After uniformly printing to a thickness of 0μ, it was dried in the air at 150'C for 30 minutes to obtain an adsorbent material.

It should be noted that the larger the amount of activated alumina, the stronger the effect.
When the VoA% was exceeded, the adhesive strength of the coating film decreased and the viscosity became too high, making it dry and difficult to form into a coating film.

On the other hand, the effect of contamination was not significant below 10 VoA%.

The table below shows the adsorption amount of cumene (isopropylbenzene) as an organic gas using the adsorption material thus prepared.

Measurement method - sample at 100'C in a vacuum of 10-5 Torr
, heated for 30 minutes to degas, then heated to room temperature at 5200℃.
A sample was placed in a container with a cumene concentration of pp[Il, and adsorption was performed for 5 minutes.

The amount of adsorption was measured by gas chromatography.

Sample 2 below is a 1:1 mixture of epoxy resin and activated alumina crushed to 1 to 10 microns, applied to the Ba ferrite surface, dried at 100°C for 2 hours, and then
The surface was polished with 00-grid paper.

As can be seen from the table, compared to Sample 2, Samples 3 and 4 have approximately three times as much adsorption, and Sample 5 has an adsorption amount that is actually six times as much.

This is made up of fine particles of alumina and silica with a size of 10 to 20 mμ.
It is thought that by increasing the adsorption surface area of a-ferrite and further binding fine powder of adsorbent such as activated alumina, the adsorption surface area was further increased and the amount of adsorption was increased.

Furthermore, although cumene was used as the organic gas here, the adsorption phenomenon is considered to be physical adsorption due to an increase in the adsorption surface area, so it is clear that the method can also be applied to the adsorption of other organic gases such as acetone and ethyl alcohol.

[Brief explanation of the drawing]

FIG. 1 is a cutaway perspective view of the relay, FIG. 2 is a perspective view of one embodiment of the present invention, and FIG. 3 is a perspective view of another embodiment.

Claims (1)

[Scope of Claims] 1. A gas adsorption material for a relay, characterized in that an inorganic adhesive layer containing a metal oxide sol as a main component is formed on the surface of one relay component. 2. The gas adsorption material for a relay according to claim 1, wherein the metal oxide sol is at least one type selected from alumina sol, silica sol, zirconia sol, and titania sol. 3. The gas adsorption material for a relay according to claim 1, wherein 10 to 50% by volume of adsorbent powder is blended into the inorganic adhesive AIM. 4 The adsorbent powder is activated alumina, molecular sieve,
The gas adsorption material for a relay according to claim 1, characterized in that the material is at least one kind of powder selected from activated carbon and silica gel.