JP2006027012A - Defoaming method and defoaming apparatus therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a defoaming method for removing bubbles from a viscous resin liquid, and a defoaming apparatus. <P>SOLUTION: The defoaming method includes a process for injecting the viscous resin liquid in a container, a process for arranging a reticulated structure so as to pierce the liquid surface of the viscous resin liquid in the container, a process for reducing the pressure in the container and a process for allowing the viscous resin liquid in the container to flow. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a method for defoaming a liquid resin having a high viscosity and a defoaming apparatus using the same.

  When two liquid resins are mixed to produce a two-component adhesive or when an ultraviolet curable resin is used, the bubbles are made from the liquid resin so that the resin film formed by applying the resin becomes smooth. It needs to be removed.

As a method for removing bubbles taken in the liquid resin, the liquid resin is injected into a defoaming container having a network structure in the opening, and the inside of the defoaming container is vacuum-sucked through the network structure. A method has been proposed (see Patent Document 1). According to this method, when the inside of the defoaming container is evacuated, the volume of the bubbles expands, the bubbles rise to the liquid level, and the bubbles gather near the liquid level and become large. When the bubbles floating on the top of the defoaming container pass through the network structure, the network structure can burst the bubbles.
Japanese Patent Laid-Open No. 5-179000

  However, as the bursting of bubbles progresses, the number of bubbles in the liquid resin decreases, and the size of the bubbles rising to the liquid level decreases, so that the bubbles cannot reach the network structure and burst. It was difficult to occur. Even when the network structure is reached, if the size of the bubbles is equal to or less than the size of the mesh, the bubbles remain in the mesh and the bubbles cannot be ruptured. As a result, there is a risk that bubbles remain in the liquid resin.

  An object of the present invention is to provide a means for solving various problems mentioned above as an example.

  The defoaming method according to claim 1 includes a step of injecting a viscous resin liquid into a container, a step of disposing a network structure so as to penetrate the liquid surface of the viscous resin liquid in the container, and the container A step of reducing the pressure inside, and a step of allowing the viscous resin liquid to flow in the container.

  The defoaming device according to claim 2 includes a container that receives a predetermined amount of the viscous resin liquid, a decompression unit that decompresses the inside of the container, and a stirring unit that causes the viscous resin liquid in the container to flow. A net-like structure penetrating the liquid surface of the predetermined amount of the viscous resin liquid received in the container is provided.

  Hereinafter, embodiments of a defoaming method and a defoaming apparatus according to the present invention will be described in detail with reference to the accompanying drawings.

  As shown in FIG. 1, a defoaming device 1 includes a container 3 that receives a predetermined amount of viscous resin liquid 2, a lid 4 of the container 3, a stirring blade 5 that causes the viscous resin liquid 2 in the container to flow, and a stirring blade. A rotation drive unit (not shown) that rotates the rotation shaft 6 connected to the rotation shaft 6. A flange 7 is provided at the periphery of the opening of the container 3, and the flange 7 and the edge of the lid 4 are in close contact with each other by a clip 8. The lid 4 is provided with an exhaust pipe 9 connected to a vacuum pump (not shown) for reducing the pressure inside the container 3. The lid 4 is also provided with a liquid supply pipe 10 that is connected to a liquid supply unit (not shown) for supplying liquid and injects the liquid into the container 3. The container 3 is provided with a drainage port 11 for taking out the viscous resin liquid from the container. The drainage port 11 can be opened and closed from the outside of the container. For example, the drainage port 11 is connected to a pipe that guides the liquid to the outside of the container, and valve means (not shown) that can be opened and closed is connected to the pipe. It may be provided.

  A net-like structure 12 is provided in the container 3, and a predetermined amount of the net-like structure 12 is arranged so as to penetrate the liquid surface 13 of the predetermined amount of the viscous resin liquid 2. Here, the net-like structure includes a flat structure having a plurality of through holes such as a wire net formed by knitting a wire. The network structure may be arranged so as to cross the direction in which the viscous resin liquid 2 flows by the operation of the stirring blade 5.

  The operation of the defoaming apparatus as described above will be described below by taking as an example the case where bubbles are defoamed from the ultraviolet curable resin.

  A predetermined amount of viscous resin liquid is poured into the container, and the network structure is disposed at a position penetrating the liquid surface of the predetermined amount of viscous resin liquid. The network structure may be arranged so as to cross the direction in which the viscous resin liquid flows.

  After the net-like structure is disposed, a lid is disposed on the opening of the container, the lid and the container are sealed with a clip, the inside of the container is sealed, and the inside of the container is decompressed using a vacuum pump. After the pressure reduction, the rotation driving unit is operated to rotate the stirring blade. Due to the flow of the viscous resin liquid, the bubbles of the viscous resin liquid forcibly collide with the network structure, and the bubbles are collected and ruptured by the network structure. In addition, it is good also as reducing pressure, after making a viscous resin liquid flow after sealing a container.

  After the bubbles disappear from the viscous resin liquid, the pressure in the container is returned to the state before the pressure reduction, and the drainage port is opened to discharge the viscous resin liquid from the container. The extracted viscous resin liquid can be used as an ultraviolet curable resin.

  In the defoaming device having the above-described configuration, the inside of the container can be decompressed by the decompression means and the viscous resin liquid can be flowed by the stirring means, so that bubbles in the viscous resin liquid are expanded and raised to the liquid surface. The viscous resin liquid can be forced to pass through the network structure. In other words, the defoaming device forcibly passes the viscous resin liquid through the network structure, thereby collecting and collecting the bubbles expanded in the network structure and bursting the bubbles. Moreover, even if air bubbles are taken into the mesh of the network structure, the air bubbles can be removed by the flow of the viscous resin liquid, so that no air bubbles remain in the viscous resin liquid.

  By using the defoaming apparatus as described above, for example, a two-component mixed adhesive and an ultraviolet curable resin can be defoamed.

  The mesh size of the network structure can be set according to the viscosity of the viscous resin liquid or the size of the particles contained in the viscous resin liquid. The network structure may be replaceable according to the viscous resin liquid to be stirred. Further, a plurality of network structures may be provided in the container. The plurality of network structures may have different mesh sizes.

  By controlling the viscosity of the viscous resin liquid and the rotation speed of the stirring blade, the bubbles of the viscous resin liquid can be concentrated near the center or near the wall surface of the container. It is preferable that the network structure extends to the vicinity of the wall surface of the container and / or the vicinity of the center of the container so that the bubbles can be captured and ruptured.

  The net-like structure is not limited to the one having a planar shape as a whole. For example, the net-like structure has a net surface bent in a bow shape (FIG. 2A) or a mountain shape (FIG. 2B). It is also good. Such a net-like structure is disposed in the container so that the bent net surface is tapered in the flow direction of the viscous resin liquid (the direction of the arrow in the figure). Since the bubbles B can be concentrated in the tapered portion in the flow direction of the viscous resin liquid to gather the bubbles, the bubbles can be more efficiently ruptured.

  Further, as shown in FIG. 3, the net-like structure is provided with a curved portion 14 whose end is curved, and the curved portion 14 may be immersed in the viscous resin liquid 2. By providing the curved portion 14, the reticulated structure 12 can capture the bubbles B that have dive from the liquid surface to the lower side of the reticulated structure 12, so that the escape of the air bubbles from the reticulated structure can be prevented.

For example, as shown in FIG. 4, the net-like structure may have needle-like protrusions 15. The network structure 12 is disposed in the container so that the needle-like protrusions 15 are arranged on the side on which the flowing viscous resin liquid enters. By providing the protrusions, the bursting of the bubbles can be promoted.
(Example)
A predetermined amount of viscous resin liquid was poured into the container, and a mesh structure having a mesh size of 65 μm × 65 μm was disposed so as to penetrate the liquid surface of the predetermined amount of viscous resin liquid. After decompressing the inside of the container, the stirring blade was rotated at a rotational speed of 200 rpm and stirred. The viscosity resin liquid had a viscosity of 3000 cP.
(Comparative example)
The viscous resin liquid was stirred in the same state as in the above example except that the network structure was not disposed in the container.
(result)
In the case of the examples, the viscous resin liquid was stirred for about 1 hour, so that bubbles could not be visually confirmed. On the other hand, in the case of the comparative example, it took about 2 hours until the bubbles could not be visually confirmed, so it was confirmed that the defoaming time from the viscous resin liquid was shortened.

  A step of injecting a viscous resin liquid into the container, a step of disposing a network structure so as to penetrate the liquid surface of the viscous resin liquid in the container, a step of reducing the pressure in the container, and the viscous resin liquid According to the defoaming method of the present invention, the bubble expanded by depressurization by forcibly passing the viscous resin liquid through the network structure. Can be collected and collected in the network structure and the bubbles can be ruptured, so that defoaming in the viscous resin liquid can be efficiently performed.

  A container for receiving a predetermined amount of the viscous resin liquid, a decompression means for reducing the pressure in the container, and a stirring means for causing the viscous resin liquid in the container to flow, the predetermined amount received in the container According to the defoaming device of the present invention, which is provided with a network structure penetrating the liquid surface of the viscous resin liquid, the network structure is formed by forcibly passing the viscous resin liquid through the network structure. Since the air bubbles taken into the mesh of the body can be removed by the flow of the viscous resin liquid, the number of air bubbles in the viscous resin liquid can be reduced.

It is a schematic sectional drawing of the defoaming apparatus of this invention. It is a schematic top view of the defoaming apparatus of this invention. It is a schematic sectional drawing of the defoaming apparatus of this invention. It is a perspective view which shows the modification of the network structure of the defoaming apparatus of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Defoamer 2 Viscous resin liquid 3 Container 5 Stirring blade 9 Exhaust pipe 12 Reticulated structure

Claims (6)

Injecting a viscous resin liquid into the container;
Disposing a network structure so as to penetrate the liquid surface of the viscous resin liquid in the container;
Reducing the pressure in the container;
And a step of causing the viscous resin liquid to flow in the container. A container for receiving a predetermined amount of viscous resin liquid;
Decompression means for decompressing the inside of the container;
A stirring means for causing the viscous resin liquid in the container to flow,
A defoaming apparatus, comprising a network structure penetrating a liquid surface of the predetermined amount of the viscous resin liquid received in the container.   The defoaming apparatus according to claim 2, wherein the network structure is replaceable.   The defoaming apparatus according to claim 2, wherein the net-like structure has a bent net surface. The network structure is provided with a curved portion at an end,
The defoaming device according to claim 2, wherein the curved portion is immersed in the predetermined amount of the viscous resin liquid in the container.   The defoaming device according to claim 2, wherein the net-like structure has a needle-like protrusion.

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