JP2001107267A - Electrically conductive filler-containing glass-coated product and method for producing glass-coated product - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase the destaticizing effect by an electrically conductive filler incorporated into a glass-coated layer as for an electrically conductive filler- containing glass-coated product obtained by incorporating a glass-coated layer formed on the surface of a base material with an electrically conductive filler and a method for producing the glass-coated product. SOLUTION: As for this glass-coated product, in an electrically conductive filler-containing glass-coated product in which a glass-coated layer 4 containing an electrically conductive filler 5 has been formed on the surface of a base material 1, the electrically conductive filler 5 is orientated from the surface of the glass-coated layer toward the surface of the base material, and, as for the method for producing the glass-coated product, in a method for producing an electrically conductive filler-containing glass-coated product in which the glass-coated layer 4 containing the electrically conductive filler 5 has been formed on the surface of the base material 1, at the time of forming the glass- coated layer 4 containing the electrically conductive filler 5 on the surface of the base material 1, voltage is applied.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a glass-coated product containing a conductive filler and a method for producing the same, and more particularly, to a glass filled with a conductive filler in which a glass coating layer formed on the surface of a base material contains a conductive filler. The present invention relates to a coated product and a method for producing the glass-coated product.

[0002]

2. Description of the Related Art Generally, in the chemical industry, the pharmaceutical industry, the food industry, and the like, a glass coating layer such as a glass lining is formed on a base material such as a stainless steel plate in order to improve corrosion resistance.

When the apparatus is operated using a non-aqueous solution such as an organic solvent in an apparatus having such a glass coating layer formed thereon, the organic solvent and the glass, which is an insulator, are stirred by such an apparatus. Contact, peeling,
Friction occurs, generating static electricity, with one being positively charged and the other being negatively charged. As a result, since neither the organic solvent nor the glass coating layer conducts electricity, the amount of leaked charge is small, and the amount of static electricity increases with the lapse of stirring time,
Even when the apparatus is grounded, there is a problem that the potential difference between the two becomes large, discharge occurs, and the glass coating layer is damaged.

In order to remove such static electricity, a technique has been developed in which a glass coating layer contains a conductive filler such as inorganic fibers as disclosed in Japanese Patent Application Laid-Open No. H11-189431.

In this technique, a conductive filler is added at the time of pulverizing glass, mixed at the time of pulverization, and a gun capable of spraying the conductive filler and glass from separate outlets is used. The two are mixed to form a glass coating layer containing a conductive filler in the base material.

[0006]

However, in such a conventional technique, a desired conductivity may not always be obtained because the conductive filler is contained in a randomly oriented state. .

[0007] That is, in order to remove static electricity, it is preferable that the static electricity is leaked to the metal base material side. However, if the conductive filler contained in the glass coating layer is randomly oriented. However, there is a problem that the static elimination is not always performed efficiently.

For this reason, in order to surely obtain the desired conductivity, it is necessary to increase the amount of the conductive filler added more than necessary.

The present invention has been made to solve such a problem, and an object of the present invention is to enhance a static elimination effect by a conductive filler contained in a glass coating layer.

[0010]

SUMMARY OF THE INVENTION In order to solve such problems, the present invention has been made as a glass-coated product containing a conductive filler and a method for producing the glass-coated product. The feature of the product is that the glass coating layer 4 containing a conductive filler is a base material 1
In the glass-coated product containing a conductive filler formed on the surface of (1), the conductive filler 5 is provided to be oriented from the surface of the glass coating layer toward the surface of the base material.

In this case, the conductive filler 5 is provided, for example, oriented from the surface of the glass coating layer toward the surface of the base material under the action of an electric field.

Further, a more specific characteristic of the glass-coated product containing a conductive filler is that the glass-coated product containing a conductive filler 5 has a glass coating layer 4 formed on the surface of a base material 1. The conductive filler 5
Are oriented substantially perpendicularly to the surface of the base material 1.

Further, a feature of the method for producing a glass-coated product containing a conductive filler is that a glass-coated product containing a conductive filler in which a glass coating layer 4 containing a conductive filler 5 is formed on the surface of a base material 1 is manufactured. In the manufacturing method described above, a voltage is applied when the glass coating layer 4 containing the conductive filler 5 is formed on the surface of the base material 1.

Another characteristic of the method for producing a glass-coated product containing a conductive filler is that the mixture of the conductive filler 5 and the glass coating layer 4 is sprayed onto the surface of the base material 1 to contain the conductive filler 5. In the method of manufacturing a glass-coated product containing a conductive filler in which the glass coating layer 4 is formed on the surface of the base material 1, when a mixture of the conductive filler 5 and the glass coating layer 4 is sprayed on the surface of the base material 1 To apply a voltage.

As described above, when a voltage is applied when the glass coating layer 4 containing the conductive filler 5 is formed on the surface of the base material 1, the conductive filler 5 is subjected to the action of the applied voltage. It is provided to be oriented from the surface of the glass coating layer toward the surface of the base material, and more preferably to be provided substantially perpendicular to the surface of the base material 1.

As a result, static electricity on the surface of the glass coating layer 4 is removed toward the base material 1 via the conductive filler 5 oriented from the glass coating layer surface toward the base material surface.

When a voltage is applied, the base material 1 is used as one electrode, and the other electrode is, for example, a wire mesh electrode 3 having a mesh.

The length / diameter (aspect ratio) of the conductive filler 5 is preferably formed to be larger than 10.

It is preferable to use a DC power supply as a power supply for applying a voltage.

The higher the applied voltage, the more the conductive filler 5
Has a good orientation, and thus has a good static elimination effect. Also,
The electric field is preferably in the range of 25 V / cm to 20 kV / cm, and 200 V
/ cm to 5 kV / cm is more preferable.

Although the conductive filler and the glass are sprayed in a mixed state, it is preferable to spray the conductive filler from a side closer to the base material 1 than the glass.

[0022]

Embodiments of the present invention will be described below.

First, an apparatus used in a method for producing a glass product coated with a conductive filler according to one embodiment will be described.

In FIG. 1, reference numeral 1 denotes a metal base material, to which a DC power supply 2 is connected.

Reference numeral 3 denotes a wire mesh electrode, which is connected to the DC power supply 2.

As described above, the base material 1 and the wire mesh electrode 3 are connected to the DC power supply 2, so that one of the base material 1 and the wire mesh electrode 3 becomes an anode and the other becomes a cathode.

Next, a method for producing a glass product coated with a conductive filler using such an apparatus will be described.

First, the glass containing the conductive filler is sprayed from above the wire mesh electrode 3.

In this case, since the wire mesh electrode 3 is formed in a mesh shape, the glass containing the conductive filler is sprayed onto the base material 1 through the mesh of the wire mesh electrode 3.

On the other hand, a voltage is previously applied to the base material 1 and the wire mesh electrode 3 by the DC power supply 2.

By applying a voltage in this manner,
An electric field is generated between the base material 1 and the wire mesh electrode 3.

When the glass containing the conductive filler is sprayed as described above in the state where the electric field is generated, when the conductive filler 5 passes through the electric field, the conductive filler 5 is electrostatically induced as shown in FIG. When a positive charge appears at one end of the conductive filler 5 and a negative charge appears at the other end, a rotating moment is generated in the conductive filler 5 and the conductive filler 5 rotates so as to be parallel to the electric field. As a result, the conductive filler 5 is oriented along the direction of the electric field.

Accordingly, when the glass containing the conductive filler is applied to the surface of the base material 1, the conductive filler in the applied glass coating layer, as shown in FIG. Are oriented in a direction substantially perpendicular to.

In the glass-coated product manufactured in this manner, the conductive filler 5 in the glass coating layer 4 formed on the surface of the base material 1 is oriented in a direction substantially perpendicular to the surface of the base material 1. Even if static electricity is generated on the surface of such a glass-coated product because of the orientation, the static electricity is applied to the conductive filler 5 oriented substantially perpendicular to the surface of the base material 1 as described above. Through the base material 1 promptly.

Therefore, even if static electricity is generated in the glass coating layer 4, the static elimination effect is significantly improved.

In the above embodiment, since the wire mesh electrode 3 is used, even if the mixture of the conductive filler 5 and the glass is sprayed from above the wire mesh electrode 3, the conductive filler is passed through the mesh of the wire mesh electrode 3. Although the preferred effect of being able to apply a mixture of 5 and glass to the surface of the base material was obtained, the use of such a wire mesh electrode 3 is not an essential condition.

It is also possible to use an electrode other than a mesh as an electrode for the base material 1, in which case a mixture of a conductive filler and glass is sprayed from a predetermined position between the two electrodes. Become.

As a means for spraying the mixture of the conductive filler and the glass, a means using a spray gun or any other means can be adopted.

Further, in the above embodiment, the conductive filler 5 is included in the glass coating layer 4 in a direction substantially perpendicular to the surface of the base material 1, but is not necessarily oriented in the vertical direction. It is not necessary to perform the alignment, for example, as shown in FIG.

In short, it is only necessary that the conductive filler is provided so as to be oriented from the surface of the glass coating layer toward the surface of the base material under the action of an electric field.

Here, "being oriented under the action of an electric field from the surface of the glass coating layer toward the surface of the base material" means that the glass coating layer containing a conductive filler is formed of the base material 1
Under the action of an electric field generated by a voltage applied when forming on the surface of the glass coating layer, and is oriented from the surface of the glass coating layer toward the surface of the base material.

When the conductive filler is originally subjected to the action of the electric field generated by the applied voltage, the conductive filler is oriented in a substantially vertical direction. However, when the conductive filler is actually contained in the glass coating layer, all the conductive fillers are oriented. Is not necessarily uniformly oriented in a substantially perpendicular direction, and there may be conductive fillers that are obliquely oriented. "Is provided" means including such a state.

[0043]

Next, an embodiment of the present invention will be described.

(Embodiment 1) In this embodiment, the wire mesh electrode is held by an insulator 2 cm above the base metal, and a voltage of 250 V is applied between the wire mesh electrode and the base metal (125 V / cm). Then, glass powder containing a conductive filler was sprayed onto the base metal from above the wire mesh electrode, and a glass coating layer was formed in a dry manner.

As a wire mesh electrode, SU having a mesh diameter of 5 mm was used.
An S mesh was used, and a stainless steel plate was used as a base metal.

The conductive filler has a diameter of 50 μm.
Two types of Pt (platinum) coated glass fibers having a length of 1 to 3 mm and a length of 2 mm were used.

Embodiment 2 In this embodiment, a voltage of 500 V was applied between the wire mesh electrode and the base metal (250 V / cm). The same wire mesh electrode, base metal, and conductive filler as in Example 1 were used.

Embodiment 3 In this embodiment, a voltage of 5 kV was applied between the wire mesh electrode and the base metal (2.5 kV / cm). The same wire mesh electrode, base metal, and conductive filler as in Example 1 were used.

Embodiment 4 In this embodiment, a voltage of 20 kV was applied between the wire mesh electrode and the base metal (10 kV / cm). The same wire mesh electrode, base metal, and conductive filler as in Example 1 were used.

(Test Results) According to the above Examples 1 to 4, the addition amount (% by weight) of Pt fiber and Pt-coated glass fiber as the conductive filler and the volume specific resistance (Ωcm) for obtaining the desired static elimination effect were obtained. ). Here, the volume resistivity refers to a resistance value of a cube (usually 1 cm) having a unit length of the substance as one side.

The measurement of the volume specific resistance was performed by a three-terminal resistance measurement method as shown in FIG.

That is, in the resistance measuring method by the three-terminal method, as shown in the figure, a glass-coated product containing a conductive filler, which is an object 8 to be measured, is installed between a main electrode 6 and a counter electrode 7. This is a method of measuring the resistance with the resistance meter 9.

The volume resistivity is calculated from the area of the electrode and the thickness of the object to be measured.

In FIG. 4, reference numerals 10 and 10 denote guard electrodes.

Comparative Example On the other hand, as a comparative example, the amount of Pt fiber and Pt-coated glass fiber (% by weight) and the volume resistivity (Ωcm) were measured under the same conditions as in Examples 1 to 4 without applying a voltage. ).

Table 1 shows the results.

[0057]

[Table 1]

In Table 1, the amount of the conductive filler added is represented by the weight% of the conductive filler in the total amount of the glass coating layer containing the conductive filler.

As is clear from Table 1, in Examples 1 to 4, the volume resistivity was smaller than that of the comparative example.

Accordingly, it is recognized that Examples 1 to 4 have better conductivity than Comparative Examples.

(Other Embodiments) In the above embodiment,
As the base material, one made of stainless steel was used,
The material of the base material is not limited to this, and may be another metal, or may be a conductive material other than the metal.

The shape of the base material is not limited to a plate shape, and the shape is not limited.

Further, in this embodiment, as the wire mesh electrode,
Although a SUS mesh having a mesh diameter of 5 mm was used, the mesh diameter of the wire mesh electrode is not limited to this, and the material of the wire mesh electrode is not limited to SUS.

Further, in the above embodiment, Pt fibers or Pt-coated glass fibers are used as the conductive filler, but metal fibers other than Pt or metal-coated glass fibers can be used.

Further, in the above embodiment, the diameter of the Pt-coated glass fiber as the conductive filler was
The diameter and length of the conductive filler are not limited to 50 μm, the length is 1 to 3 mm, the diameter of the Pt fiber is 35 μm, and the length is 2 mm. However,
It is preferable that the length / diameter (aspect ratio) is larger than 10.

It is also possible to use a wire made of a conductive material other than a metal such as an oxide-based conductive ceramic as the conductive filler.

[0067]

As described above, according to the present invention, since a glass coating layer containing a conductive filler is formed on the surface of the base material 1 while a voltage is applied, the conductive filler in the glass coating layer is formed. Is oriented in the direction from the glass coating layer surface toward the base material surface under the action of an electric field, and the static electricity charged on the surface of the glass coating layer is quickly transferred to the base material side by the conductive filler. It is removed, and the static elimination effect is significantly improved.

In particular, when the conductive filler is oriented substantially perpendicular to the surface of the base material, the static elimination effect is further improved.

As a result, a desired static elimination effect can be obtained with a small amount of the conductive filler, and the amount of the conductive filler to be added can be greatly reduced as compared with the conventional case.

When the length / diameter of the conductive filler is larger than 10, a desired orientation effect of the conductive filler can be obtained with a smaller voltage.

Furthermore, when a DC power supply is used as the power supply, the polarity of the base material does not change, and the conductive filler is accelerated by the electric field. As a result, the energy that collides with the base material during construction is reduced. The effect is that the conductive filler is easily vertically oriented.

When a pulse power supply is used as a power supply, a strong electric field can be applied in a short time, and the power consumption can be reduced if the same voltage is used. There is an effect that can be.

Further, when the conductive filler and the glass are sprayed separately, and the conductive filler is sprayed from a position closer to the glass than the glass, the applied voltage can be reduced. Has the merit of being able to simplify simplification, safety, etc.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view showing a manufacturing process of a glass product coated with a conductive filler as one embodiment.

FIG. 2 is an explanatory diagram showing a state in which a conductive filler is oriented along the direction of an electric field.

FIG. 3 is an enlarged sectional view of a main part of a glass-coated product as one embodiment.

FIG. 4 is a schematic sectional view showing a method of measuring a volume resistivity.

FIG. 5 is an enlarged sectional view of a main part of a glass-coated product as another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Base material 2 ... DC power supply 3 ... Wire mesh electrode 4 ... Glass coating layer 5 ... Conductive filler

Claims (10)

[Claims] A glass-coated product containing a conductive filler, wherein a glass coating layer (4) containing a conductive filler (5) is formed on the surface of a base material (1), wherein the conductive filler (5)
Is provided in a direction oriented from the surface of the glass coating layer toward the surface of the base material. 2. A glass material coated with a conductive filler, wherein a glass coating layer (4) containing a conductive filler (5) is formed on the surface of a base material (1), wherein the conductive filler (5)
Characterized by being oriented under the action of an electric field from the surface of the glass coating layer toward the surface of the base material. 3. A glass-coated product containing a conductive filler, wherein a glass coating layer (4) containing a conductive filler (5) is formed on the surface of a base material (1).
Characterized by being oriented substantially perpendicular to the surface of the base material (1). 4. The glass material coated with a conductive filler according to claim 1, wherein the length / diameter of the conductive filler (5) is larger than 10. 5. A method for producing a glass product coated with a conductive filler, wherein a glass coating layer (4) containing a conductive filler (5) is formed on the surface of a base material (1). 5) The glass coating layer (4) containing
A method for producing a glass-coated product containing a conductive filler, wherein a voltage is applied when forming the product on the surface of the glass. 6. A glass coating layer (4) containing a conductive filler is formed on the surface of the base material (1) by spraying a mixture of the conductive filler (5) and glass on the surface of the base material (1). In a manufacturing method for manufacturing a glass product coated with conductive filler, a mixture of conductive filler (5) and glass is used as a base material (1).
A method for producing a glass-coated product containing a conductive filler, wherein a voltage is applied when spraying on a surface of the glass. 7. The glass with a conductive filler according to claim 5, wherein a voltage is applied between the base material (1) and a wire mesh electrode (3) disposed above the base material (1). Manufacturing method of coated products. 8. The method for producing a glass product coated with a conductive filler according to claim 5, wherein the length / diameter of the conductive filler (5) is formed to be larger than 10. 9. The method for producing a glass product coated with a conductive filler according to claim 5, wherein a voltage is applied by a DC power supply (2). 10. The conductive filler (5) is made of a base material rather than glass.
The method for producing a glass product coated with a conductive filler according to any one of claims 6 to 9, which is sprayed from a side close to (1).