JPH09253519A - Dispersing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To keep good dispersion efficiency even a device is used for a long time in dispersing devices by which dispersing media are subjected to motion by the rotation of a rotor to disperse slurry by shear between the dispersing media by providing sector projecting parts on the outer peripheral side face of the rotor in the perpendicular direction to the axis of the rotor. SOLUTION: In a high speed agitate board dispersing device suitable for the use for dispersion of various kinds of ink, paint, paste or the like, a rotor 3 of a dispersing device called a beads mill is rotated in a vessel 1 to enlarge the relative velocity difference between dispersing media and apply larger shear force, allowing effective dispersion to be performed. In this case, on the outer peripheral side face of the rotor, many sector projecting parts 7 whose sector surfaces are perpendicular to the axis of the rotor are provided projectingly. By thus using the sector projecting parts 7, since the sector projecting parts 7 are long in the rotational direction, the dispersion efficiency is nearly influenced even when the tip of the projecting parts 7 is worn to keep high dispersion efficiency for a long period of time.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to various inks, paints,
The present invention relates to the structure of a disperser such as a high-speed agitator type, which is used for dispersing paste or the like and for mixing and pulverizing powder dispersed in a dispersion medium in a slurry form.

[0002]

2. Description of the Related Art In recent years, when kneading and dispersing various inks, paints, pastes, etc., or mixing and crushing powder dispersed in a dispersion medium into a slurry, it has a high dispersion capacity and dispersion speed. Dispersers such as high speed agitator type have come to play an important role.

As shown in FIG. 3, a rotor of a conventional high speed agitator type disperser, for example, a bead mill, has a disc-shaped disk 3 on a rotor shaft 2.
The mainstream type is the one to which 1 is attached, or the type in which a groove-shaped protrusion 5 is provided on the outer peripheral side surface of the rotor 3 as shown in FIG. Further, for the purpose of increasing the relative speed difference between the dispersion media and applying a larger shearing force to improve the dispersion efficiency, a pin-shaped protrusion 6 is provided on the outer peripheral side surface of the rotor 3 as shown in FIG. A bead mill with a pin-type rotor has been developed (Fig. 2).

[0004]

However, the rotor wears out as it is used. Especially, in the case of the pin type, the wear of the pin-shaped projections, which is attached for the purpose of improving the dispersion efficiency, There is a problem in that the dispersion efficiency decreases as the usage time increases, because it is significantly worn away.

It is an object of the present invention to provide a disperser capable of eliminating such conventional drawbacks and exhibiting excellent dispersion efficiency over a long period of time.

[0006]

DISCLOSURE OF THE INVENTION The disperser of the present invention has a fan-shaped projection on the outer peripheral side surface of the rotor, the fan-shaped surface of which is perpendicular to the axis of the rotor. The structure is such that good dispersion efficiency can be maintained.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The fan-shaped projection portion according to the present invention is considered to have a shape in which the pin-shaped projection portion is extended in the rotational direction, and plays the same role as the pin-shaped projection portion during kneading and dispersion. Therefore, it is possible to obtain the same dispersion efficiency as in the case where the pin-shaped protrusions are provided.

In addition, the pin-shaped projection portion, when operated for a long period of time, causes the front side of the projection portion against rotation of the rotor to
It may be worn out due to collision and friction with the dispersion medium or slurry, and eventually worn out. Although the dispersion efficiency also decreases with this, unlike the pin-shaped projections, the fan-shaped projections are long in the rotation direction, and therefore even if the front side of the projections is worn, the dispersion efficiency is hardly affected. Therefore, high dispersion efficiency is maintained for a long period of time.

(Embodiment) Next, the structure of the present invention will be specifically described with reference to an embodiment. The mixture having the composition shown in Table 1 was mixed for 2 hours by using a planetary mixer, and further kneaded and dispersed for 2 hours by a bead mill to obtain a ferrite paste.

[0010]

The rotor of the bead mill used at this time is
Two types of rotor A and rotor B shown in Table 2 were used.

[0012]

(Evaluation) In order to compare the dispersion states of these samples, the samples were formed by a doctor blade method on a polyethylene terephthalate film having a thickness of 75 μm,
After drying, the center line average roughness (Ra) was measured by the method specified in JIS-B-0601 to evaluate the smoothness. In addition, the change with time in the dispersion efficiency before and after the total operating time reached 500 hours was evaluated. The dispersion efficiency is Ra
The operation time (minutes) until ≦ 0.05 μm was shown.

Table 3 shows the evaluation results. Table 3 shows that the smoothness is such that the smaller the value of Ra, the better the dispersed state of the slurry. From the obtained Ra value, it can be seen that the dispersion efficiency when the rotor A is used is the same as when the rotor B is used. In addition, it can be said that when the rotor A is used, the change in dispersion efficiency with time is small. This is because the shape of the protrusions on the outer peripheral side surface of the rotor is long in the circumferential direction, so that abrasion of the protrusions is unlikely to occur and good dispersion efficiency can be obtained for a long period of time.

[0015]

[0016]

As described above, by using the high speed agitating type dispersing machine of the present invention, it is possible to obtain the same dispersion efficiency as that of the conventional one for a long period of time, so that it is possible to produce various inks, paints, pastes and the like. Has a large contribution.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a high speed agitator type dispersion machine of the present invention.

FIG. 2 is a cross-sectional view showing a conventional high speed agitator type disperser.

FIG. 3 is a cross-sectional view showing a conventional high speed agitator type disperser.

FIG. 4 is a cross-sectional view showing a conventional high speed agitator type disperser.

[Explanation of symbols]

 1 Vessel 2 Rotor Shaft 3 Rotor 4 Dispersion Media 5 Groove-shaped Protrusion 6 Pin-shaped Protrusion 7 Fan-shaped Protrusion 31 Disc-shaped Disc

Claims (1)

[Claims] 1. A disperser in which a dispersion medium is moved by the rotation of a rotor and the slurry is dispersed by shearing between the dispersion media, and a fan-shaped protrusion is provided on the outer peripheral side surface of the rotor in a direction perpendicular to the axis of the rotor. Disperser characterized by that.