JPS5919402B2 - Polyphenylene sulfide resin electrode body - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electrode body that is attached to a wall of a tank or the like by penetrating it.

In general, synthetic resin is a poor conductor of electricity, so a conductor is inserted into the synthetic resin to maintain insulation on the outside while allowing electricity to flow through the required path. It is a widely known place.

However, synthetic resins may not be suitable depending on the environment in which they are used, so inorganic materials such as insulators and glass are also widely used. Examples of environments where synthetic resins are not suitable include cases where the ambient temperature is too high, and cases where water resistance, chemical resistance, solvent resistance, weather resistance, etc. are lacking.

Therefore, if it were possible to use synthetic resins with improved performance, the inherent advantages of synthetic resins such as ease of processing, resistance to cracking, and lightness would be further utilized, and the range of applications would be further expanded. It turns out.

On the other hand, polyphenylene sulfide resin has excellent heat resistance, water resistance, and solvent resistance, and since it is a thermoplastic resin, it is easier to process than thermosetting resin, and has other advantages common to synthetic resins. Therefore, it is expected to be a synthetic resin that can be used in a range of applications that could not be applied to conventional synthetic resins. Therefore, the present inventors fabricated an electrode body by inserting a conductor into the polyphenylene ζo phyte resin molded body and conducted various tests on this electrode body, which were found to be impossible with conventional synthetic resin electrode bodies. It can be used as an electrical terminal even in an atmosphere exposed to high temperatures of 160°C or higher.
Sara? 5 found that it is possible to maintain insulation properties for a long period of time even in an atmosphere in contact with water or high-temperature steam.

For this reason, polyphenylene sulfur can be used even in fields where conventional synthetic resin electrical terminals cannot be used, such as when installing a water level gauge in a boiling water tank to establish electrical continuity from outside the tank. Any electrical terminal made of id resin can be used.

Furthermore, when installing in a sealed high-pressure boiler to establish electrical continuity between the outside air and the contents, insulation with heat resistance and strength that can withstand the high temperature and internal pressure of the boiler is required. Although a terminal is required, an electrode body made of polyphenylene sulfide resin can fully meet this requirement.

However, in such a polyphenylene sulfide resin electrode body, the inserted conductor and the polyphenylene sulfide resin or its composition have different physical properties such as thermal expansion coefficients, The adhesive surface may shift slightly or a gap may occur.

Particularly when installing an electrode body in a high-pressure boiler, if such a phenomenon occurs, steam leakage will be a non-negligible level. It is necessary to make sure that there is no such thing. Problems related to the interface between these dissimilar materials must be solved by taking into consideration the quality of each material, but until now little has been known about the problem of the adhesive interface between polyphenylene sulfide resin and a conductor. . Therefore, an object of the present invention is to eliminate the occurrence of misalignment or gaps between the conductor and the resin in an electrode body made of polyphenylene sulfide resin in which a conductor is inserted through the electrode body, and therefore, to eliminate the problem even under high temperature and high pressure. An object of the present invention is to provide an electrode body that can be used without any problems.

That is, in the polyphenylene sulfide resin electrode body according to the present invention, a conductor is inserted through a molded body of polyphenylene sulfide resin or a polyphenylene sulfide resin composition, and the conductive body and the molded body are electrically conductive. It is characterized by having a silane compound layer interposed between it and the body.

The invention will be explained in detail below with reference to embodiments shown in the accompanying drawings. Figure 1 shows a preferred embodiment as an electrode body for a high-pressure boiler, in which a conductor 2 is inserted through a polyphenylene sulfide resin molded body 1, and both ends of the conductor are molded with resin. protrudes from body 1].

A silane compound layer 3 is interposed between the resin molded body 1 and the conductor 2. A threaded portion 4 is provided on a part of the outer peripheral surface of the resin molded body 1 so that the electrode body can be screwed and attached to the wall of the boiler body. Only the conductor shown in FIG. 1 is shown in FIG.
For this conductor 2, a normal metal conductor made of materials such as copper, brass, or aluminum is used, but if corrosion resistance such as those exposed to water vapor is important, gold, silver, stainless steel alloy, etc. A conductor made of a material or a conductor that has been subjected to a plating process is more preferably used. The conductor 2 consists of a main body 5 and a collar 6 fixed to this main body,
By applying the knurling process 7 to the circumferential surface of the collar 6, the adhesive area between the resin and the collar 6 is increased, so that adhesive strength and resistance to shear stress can be improved. Furthermore, by providing a plurality of through holes 8 in the collar 6 for passing the resin through, the flow of the resin is improved during insert molding, which will be described later, thereby dramatically improving the tightening fracture torque value of the electrode body. be able to. The polyphenylene sulfide resin used in the present invention is, for example, the resin detailed in Japanese Patent Publication No. 45-3368, and the polyphenylene sulfide resin composition is the polyphenylene sulfide resin described above. Reinforcing materials such as glass fiber, glass beads, quartz powder, alumina powder,
It contains fillers that are electrically poor conductors, such as mica flakes and metal oxides, and other resins as necessary.

It is desirable that the content ratio of the above-mentioned reinforcing material and filler is such that the total of both is within 70% by weight of the entire resin composition, with the reinforcing material being 30 to 60% by weight and the filler being 10 to 30% by weight. Particularly preferable is one containing the above from the viewpoint of mechanical strength. In the present invention, as the silane compound interposed between the resin molding and the conductor, epoxycyclohexylalkyltrialkoxysilane, glycidoxyalkyltrialkoxysilane, methacryloxyalkyltrialkoxysilane, etc. can be preferably used.

When manufacturing the electrode body of the present invention as illustrated,
The conductor shown in FIG. 2 is first coated with a silane compound, or is immersed in the silane compound and then taken out to form a thin layer of the silane compound on the surface of the conductor.

This conductor may then be previously fitted into an insert mold, and a polyphenylene sulfide resin or a composition thereof may be melt injection molded thereon using an injection molding machine. Note that when applying the silane compound to the conductor, it is preferable to clean the surface of the conductor in advance to ensure sufficient adhesion of the silane compound. Further, the amount of the silane compound to be adhered may be an amount that allows it to adhere naturally to the surface of the conductor. The illustrated embodiment shows a preferred example of an electrode body for a high-pressure boiler, and the present invention is not limited to this embodiment.

For example, the shapes of the resin molded body 1 and the conductor 2 can be changed as appropriate depending on the use of the electrode body, and it goes without saying that the means for attaching the electrode body to a boiler or the like is not necessarily limited to the screw means 4. The effects of the present invention will be specifically explained below with reference to Examples.

Example 1 The stainless steel conductor shown in Fig. 2 (surface area 15 cd,
Weight: 18 g) was mixed with γ-methacryloxypropyltrimethoxysilane (trade name: Silane Coupling Agent A-174).
(manufactured by Nippon Unica Ichi Co., Ltd.), the sample was taken out and left in the open air, and the excess oil was drained off before being fitted into an insert mold.

Cylinder temperature: 280℃ at the rear, 310℃ at the center, 300℃ at the front, nozzle temperature at 300℃, mold temperature at 135℃.
A polyphenylene sulfide resin composition (trade name "Ryton R-4" manufactured by Phillips Petroleum, a mixture of 60% polyphenylene sulfide resin and 40% glass fiber) was charged into an injection molding machine set at 2, and the injection pressure was set at 2.
00 kVCf7i was injected into the above-mentioned insert mold to produce the boiler electrode body shown in FIG. 1.
Separately, for comparison, an electrode body was produced in exactly the same manner as above, except that the conductor was not immersed in the silane compound but was inserted into an insert mold as it was.

When the two obtained electrode bodies were respectively installed in a boiler and heated to a water vapor pressure of 3 kg/Cd, a gap was formed at the interface between the conductor part and the resin part in the comparison sample, and water vapor leaked from this gap. However, no leakage was observed in the electrode body of the present invention.

Further, as shown in FIG. 2, by knurling 7 on the outer peripheral surface of the brim of the conductor and further drilling a through hole 8, the shear stress of the electrode body can be reduced to 100k9/C25.
Improved to 0kg/Cd. Example 2 As a silane compound, β-(3,4-epoxycyclohexyl)ethyltrimethoxysilane (trade name "Silane Coupling Agent A")
An electrode body for a boiler was produced in the same manner as in Example 1, except that the conductor was coated with "-186" (manufactured by Nippon Unica Ichi Co., Ltd.).

When this electrode body was attached to a boiler and the water temperature was raised,
There was no leakage at all even at a water temperature of 200 to 210°C and a water vapor pressure of 16 cr1i, and no change was observed even after 200 hours had passed. Example 3 As a silane compound, r-glycidoxypropyltrimethoxysilane (trade name "Silane Coupling A-18")
An electrode body for a boiler was produced in the same manner as in Example 1, except that the conductor was coated with 7" (manufactured by Nippon Unica Ichi Co., Ltd.).

When this electrode body is installed in a boiler, the water vapor pressure is 10 kg/C.
Although it was heated to 77f, no steam leakage was observed.

[Brief explanation of the drawing]

FIG. 1 is a half-sectional view showing an embodiment of the electrode body of the present invention, and FIG. 2 is a perspective view showing only the conductor shown in FIG. 1. 1...Polyphenylene sulfide resin, 2.
... Conductor, 3... Silane compound layer,
5...Conductor body, 6...Brim, 7.
...Knurling, 8...Through hole.

Claims (1)

[Claims] 1. An electrode body is inserted through a molded body of polyphenylene sulfide resin or a polyphenylene sulfide resin composition, and a silane compound layer is interposed between the molded body and the conductor. A polyphenylene sulfide resin electrode body characterized by: 2 Claim 1 using epoxycyclohexylalkyltrialkoxysilane as the silane compound
Electrode body described in section. 3. Claim 1, wherein the conductor consists of a conductor body and a collar fixed to the body, the collar is knurled on the circumferential surface, and the collar is provided with a plurality of through holes. The electrode body described.