JP4449850B2 - Resin varnish agitator - Google Patents

Description

  The present invention relates to a resin varnish agitating device for agitating a resin varnish used for a prepreg for manufacturing a printed wiring board.

  Conventionally, as a stirring tank used for the polymerization reaction of solvent-based or water-based adhesives or adhesives, a stirring blade is provided in the stirring tank, and the top and bottom of the stirring tank are connected by a circulation pipe to provide a circulation circuit. A stirrer is proposed (see, for example, Patent Document 1).

  According to this apparatus, the polymerization reaction is carried out by circulating the adhesive and the adhesive in the stirring tank through the circulation circuit and the stirring blade, thereby allowing the entire region in the stirring tank from the initial low viscosity to the high viscosity. Thus, a uniform polymerization reaction is carried out to obtain an adhesive or pressure-sensitive adhesive having a stable polymerization degree and molecular weight.

By the way, a resin varnish containing a filler used for a prepreg for manufacturing a printed wiring board (hereinafter also referred to as “ENR varnish”) can be sufficiently filled in a shorter time from the viewpoint of improving quality and improving productivity. It is desired to make the resin varnish concentration uniform in the stirring tank. Specifically, the desired level of dispersibility is 1 g or less of residue when 2 liters of ENR varnish is passed through a sieve having an absolute cross of 53 μm, and the most desirable is 0 g of residue. As a conventional ENR varnish stirrer, a stirrer equipped with a stirring blade is known. Some of the stirring tanks are provided with sensors, baffle plates, and the like, and the presence of these sensors sometimes stagnates the resin varnish. In this apparatus, the ENR varnish is agitated by circulating the liquid in the agitation tank using an agitating blade, and it takes time to make the concentration of the resin varnish in the agitation tank uniform. Further, the dispersibility level of this apparatus is 0.7 g in the residue measurement by the above method, and although the desired dispersibility level has been reached, the study on the best for 0 g residue is still in progress. It is the actual situation.
JP 2005-68304 A

  The present invention provides a resin varnish stirrer that can sufficiently disperse the filler in the resin varnish in a short time and make the resin varnish concentration uniform in the stirring tank from the background as described above. It is an issue.

In order to solve the above problems, the present invention provides a resin varnish stirrer that disperses filler in a resin varnish and mixes the resin varnish, and has a baffle plate on a side surface with stirring blades. The tank has a varnish stirring tank, a circulation pipe, and a circulation pump provided in the circulation pipe, and is provided at the bottom of the stirring tank and below the baffle plate and above the stirring tank. A circulation path is formed in which the inlet is connected by a circulation pipe and the circulation pipe communicates with the inside of the agitation tank. The resin varnish in the agitation tank is extracted from the outlet by a circulation pump and sent through the circulation pipe. A swirling flow is generated in the resin varnish in the stirring tank by feeding into the stirring tank through the inlet.

Small present invention, the second, in the first resin varnish stirrer, a formed by the circulation pipe circulating path, its capacity is 30% or less of the capacity of the stirring tank, equipped with a stirring blade A volumetric stirring tank is provided, and the small volume stirring tank and the stirring tank are connected by a circulation pipe.

Then, in the third, in the second resin varnish stirrer, a stirring blade of the stirring tank and the small-capacity stirring tank is characterized in that its peripheral speed is variable controllable respectively.

Further, in the fourth, in the second or third resin varnish stirrer, small volume stirring vessel has a function of discharging the varnish in any height, the liquid surface of the resin varnish having a small capacity stirring vessel And the resin varnish is continuously stirred.

The fifth, the resin varnish stirrer fourth Neu Zureka from said second, small volume stirring vessel, wherein the resin varnish is introduced by the circulation pipe from the bottom.

According to the first invention as described above, since the swirl flow is generated in the resin varnish in the stirring tank, the filler can be sufficiently dispersed in the resin varnish in a shorter time. The resin varnish concentration in the tank can be made uniform. And, since the outlet is provided at the position below the baffle plate, the filler accumulated under the baffle plate can be extracted, and the resin varnish with a high filler content can be circulated above the stirring tank. The resin varnish can be efficiently stirred.

According to the second aspect of the invention, a small-capacity agitation tank equipped with a stirring blade having a capacity of 30% or less of the capacity of the agitation tank is provided in the circulation path formed by the circulation pipe. Since the small capacity agitation tank and the agitation tank are communicated with each other through the circulation pipe, the resin varnish is agitated in each tank, and the agitation effect of the resin varnish can be further improved.

According to the third invention, the peripheral speeds of the stirring blades of the stirring tank and the small-capacity stirring tank can be variably controlled, so that each stirring tank can be controlled to have a predetermined dispersion force according to the purpose. can do.

According to the fourth aspect of the present invention, the liquid level of the resin varnish in the small-capacity agitation tank is not higher than or lower than an arbitrary height, the liquid level is stable, and the resin varnish can be continuously stirred. .

According to the fifth aspect , since the resin varnish is introduced from the bottom of the small volume stirring tank by the circulation pipe, the resin varnish in the small volume stirring tank can be stirred more efficiently.

  The present invention has the above-described features, and the best mode for carrying out the invention will be described below.

  The resin varnish stirrer in the present invention uses a resin varnish containing a filler (ENR varnish) as a target for stirring. Such a resin varnish is used, for example, in a prepreg for manufacturing a printed wiring board, and a thermosetting resin such as an epoxy resin, a phenol resin, or a polyimide resin, a curing agent, and a filler are diluted with an organic solvent. It is a thing. Further, it may contain a curing accelerator, a coupling agent and the like, and is not particularly limited as long as it is a material for a resin varnish generally used for a prepreg or the like. Examples of the filler include silica, alumina, silicon nitride, aluminum nitride, aluminum hydroxide and the like, and these are generally blended in the resin varnish in a range of 15 to 60% by mass. The size is not particularly limited as long as it is generally used for a resin varnish.

1, Ri schematic diagram showing the overall structure of a resin varnish stirring device as a reference example, FIG. 2 is an embodiment of the present invention, a resin varnish using the stirring vessel 1 having a baffle plate 4 on the side surface schematic diagram illustrating the overall configuration of the stirring device.

  What is more characteristic than the resin varnish agitator of the present invention is that the resin varnish in the agitation tank 1 is again fed into the agitation tank 1 via a circulation path outside the agitation tank 1 (also called swirl). The flow of the resin varnish gives the resin varnish in the agitation tank 1 a flow (also referred to as a swirl flow).

First, the resin varnish stirring device of FIG. 1 will be described.

  According to this figure, the resin varnish stirrer is composed of a resin varnish stirring tank 1 having a stirring blade 11, a circulation pipe 2, and a circulation pump 3 provided in the circulation pipe 2.

  An outlet (not shown) is provided at the bottom of the stirring tank 1, and an inlet (not shown) is provided above the stirring tank 1. The outlet and the inlet are connected by a circulation pipe 2, and the circulation pipe 2 communicates with the inside of the stirring tank 1 to form a circulation path. The resin varnish filled in the stirring tank 1 is extracted from the outlet by the circulation pump 3. The extracted resin varnish is sent again into the stirring tank 1 from the inlet through the circulation pipe 3. Then, the swirling flow is generated in the resin varnish in the stirring tank 1 by feeding the resin varnish from the feeding port, whereby the filler can be sufficiently dispersed in the resin varnish in a shorter time. The inner resin varnish is also mixed so that its concentration is uniform in the stirring tank.

That is, the bottom of the stirring tank 1 usually tends to accumulate filler and the resin varnish concentration is high . However, according to the stirring device of FIG. 1 , the high concentration resin varnish is extracted together with the filler accumulated at the bottom. Since the liquid is fed again into the stirring tank 1 through the circulation path outside the stirring tank 1, the circulation efficiency is improved as compared with the conventional stirring apparatus in which the liquid circulation is performed only in the stirring tank 1. Moreover, in the resin varnish in the stirring tank 1, the resin varnish of the upper layer part in which the resin varnish concentration is lower than the resin varnish concentration near the bottom of the stirring tank 1 and the resin varnish fed from the inlet are mixed. Therefore, it can stir efficiently. Furthermore, the stirring effect can be further enhanced by the swirling flow of the resin varnish in the stirring tank 1 by feeding the resin varnish from the feeding port.

For example, in the configuration of FIG. 1, a resin containing aluminum hydroxide (size 5 μm) using a resin varnish stirrer with a capacity of the stirring tank 1 of 5 tons and a flow rate of 40 liters / min when the circulation pump 3 is pumped. When the varnish (ENR varnish) is stirred, the resin varnish concentration in the stirring tank 1 becomes uniform in 1 hour of stirring time (confirmed by measuring the specific gravity). Moreover, the residue when 2 liters of ENR varnish is passed through a sieve having an absolute cross of 53 μm is 0.1 g. From these results, the filler can be sufficiently dispersed in the resin varnish in a short time, and the resin varnish concentration in the stirring tank can be made uniform. On the other hand, in the resin varnish stirring apparatus having the configuration shown in FIG. 1, a resin containing aluminum hydroxide (size 5 μm) only in the stirring tank 1 without using the circulation pump 3 and passing the resin varnish through the circulation pipe 2. When the varnish (ENR varnish) is stirred, the resin varnish concentration in the stirring tank 1 is high at the lower part of the stirring tank 1 and is not uniform due to the lower concentration at the upper part in a stirring time of 3 hours (specific gravity measurement). Confirmed). Moreover, when 2 liters of ENR varnish is passed through a sieve having an absolute cross of 53 μm, the residue is 0.7 g.

The inlet is provided above the agitation tank 1, but the installation position is a position where the resin varnish in the upper layer portion of the resin varnish in the agitation tank 1 can be mixed with the resin varnish fed from the inlet. For example, in the resin varnish stirrer of FIG. 1 , a feed port is provided on the upper surface of the stirring tank 1.

The stirring tank 1 in FIG. 1 may be a commonly used one, and is formed in a cylindrical container shape from a material such as stainless steel, for example. And as for this stirring tank 1, you may attach the jacket for a heating or cooling to the outer peripheral surface as needed. Inside the stirring tank 1, a plurality of stirring blades 11 are fixed to the shaft 12 and disposed. The shaft 12 is rotationally driven by a driving device such as a motor, whereby the stirring blade 11 rotates to mix and disperse the resin varnish in the stirring tank 1. A plurality of outlets and inlets may be provided.

The circulation pipe 2 in FIG. 1 is not particularly limited as long as the material does not adversely affect the resin varnish and does not deteriorate due to the resin varnish. For example, the same material such as stainless steel as the stirring tank 1 is considered. The cross-sectional area, cross-sectional shape, length, and the like of the circulation pipe 2 are appropriately designed in consideration of the capacity of the stirring tank 1 to be used, the type of resin varnish, and the like. In addition, when a plurality of outlets or inlets are provided, the branched circulation pipes 2 may be used to connect to each outlet or inlet, or a plurality of circulation pipes that are not branched may be provided. You may make it connect using a book.

Further, the circulation pump 3 in FIG. 1 may be a commonly used pump for transporting liquid, but the resin varnish is extracted from the outlet of the stirring tank 1 and the resin varnish is sent from the inlet to the inside of the stirring tank. A pump having a transport capability capable of generating a swirling flow in the resin varnish is considered.

Next, the resin varnish stirring device of FIG. 2 will be described.

  FIG. 2 is a schematic diagram showing an overall configuration of a resin varnish stirring apparatus using a stirring tank 1 having a baffle plate 4 on its side surface as a stirring tank.

  According to this figure, the resin varnish stirrer is composed of a resin varnish agitation tank 1 having a stirring blade 11 and a baffle plate 4 on its side, a circulation pipe 2 and a circulation pump 3 provided in the circulation pipe 2. Has been. An outlet (not shown) is provided at the bottom of the stirring tank 1, and an inlet (not shown) is provided above the stirring tank 1. The outlet and the inlet are connected by a circulation pipe 2, and the circulation pipe 2 communicates with the inside of the stirring tank 1 to form a circulation path.

This embodiment is different from the resin varnish stirring apparatus of FIG. 1 in that the stirring tank 1 having a baffle plate 4 on its side surface is used as the stirring tank 1. In the case of the stirring tank 1 having the baffle plate 4, since the resin varnish under the baffle plate 4 is not sufficiently circulated due to the presence of the baffle plate 4, the filler is not dispersed and the bottom of the baffle plate 4 at the bottom of the stirrer tank 1. It is easy to accumulate in the position, and the resin varnish concentration is also high. For this reason, in this embodiment, it is provided in the position below the baffle plate 4 of the bottom part of the stirring tank 1 as an installation location of a particularly preferable outlet. As a result, a high-concentration resin varnish containing filler accumulated at the bottom of the stirring tank 1 at a position below the baffle plate 4 can be efficiently extracted. The extracted resin varnish is fed into the agitation tank 1 from the inlet through the circulation pipe 2, and a swirling flow is generated in the resin varnish in the agitation tank 1. Therefore, the filler can be sufficiently dispersed in the resin varnish in a shorter time, and the resin varnish concentration in the stirring tank 1 can be made uniform. In the present embodiment, two outlets are provided, but in consideration of the structure of the baffle plate 4 and the amount of filler accumulation associated therewith, three or more outlets may be provided depending on circumstances.

  In this embodiment, the branched circulation pipe 2 is connected to two outlets, and the resin varnish is fed together from the filler at the bottom by feeding the resin varnish from one inlet. In addition to being able to extract efficiently, it is possible to effectively generate a swirling flow of the resin varnish in the agitation tank 1 by feeding the resin varnish from the feed port. Thereby, a filler can fully be disperse | distributed in a resin varnish in a shorter time, and the resin varnish density | concentration in the stirring tank 1 can be made uniform.

In addition, about the structure except the stirring tank 1 which has the baffle plate 4, and the branched circulation pipe 2, it is the same as that of the resin varnish stirring apparatus of FIG. 1, and detailed description is abbreviate | omitted.

FIG. 3 shows a small volume stirring tank 5 having a stirring blade 11 whose capacity is 30% or less of the capacity of the stirring tank 1 in the circulation path formed by the circulation pipe 2. It is a schematic diagram which shows the whole structure of the resin varnish stirring apparatus which connected 5 and the stirring tank 1 with the circulation pipe 2. FIG.

In the resin varnish stirrer of FIG. 3, a resin varnish supply port (not shown) is provided at the bottom of the small-capacity stirring tank 5, and the supply pipe and the outlet (not shown) of the stirring tank 1 are connected to the circulation pipe 2. Connected with. The high-concentration resin varnish containing the filler accumulated at the bottom of the stirring tank 1 is extracted from the outlet of the stirring tank 1, and the extracted resin varnish passes through the circulation pipe 2 and enters the small volume stirring tank 5 from this supply port. Resin varnish will be supplied. In addition, a discharge port (not shown) is provided in the small-capacity agitation tank 5, and the discharge port and a delivery port (not shown) of the agitation tank 1 are connected by a circulation pipe 2. The resin varnish is sent out to the stirring tank 1.

In the resin varnish stirrer of FIG. 3 , the filler is dispersed in the resin varnish by stirring the high-concentration resin varnish containing the filler accumulated at the bottom of the stirring tank 1 with the stirring blade 51 in the small-capacity stirring tank 5. Can do. And the stirring effect of the resin varnish in the stirring tank 1 can be further improved by sending the resin varnish in the small volume stirring tank 5 into the stirring tank.

  The capacity of the small volume stirring tank 5 is set to 30% or less of the capacity of the stirring tank 1 in consideration of the stirring / dispersing efficiency of the resin varnish in the entire apparatus, the introduction cost, and the installation location. The lower limit is not particularly limited, but is considered to be 5% or more from the viewpoint of the stirring and dispersion efficiency of the resin varnish.

For example, in the configuration of FIG. 3, a resin varnish agitator having a capacity of 5 tons for the stirring tank 1, a capacity of 0.15 tons for the small capacity stirring tank 5 and a flow rate of 40 liters / min when pumping the circulation pump 3 is used. When the resin varnish (ENR varnish) containing aluminum hydroxide (size: 5 μm) is stirred, the resin varnish concentration in the stirring tank 1 becomes uniform within a stirring time of 1 hour (confirmed by measuring the specific gravity). Moreover, when 2 liters of ENR varnish is passed through a sieve having an absolute cross of 53 μm, the residue is 0.02 g. From these results, the filler can be sufficiently dispersed in the resin varnish in a short time, and the resin varnish concentration in the stirring tank can be made uniform.

  The peripheral speeds of the stirring blades 11 and 51 of the stirring tank 1 and the small-capacity stirring tank 5 may be variably controllable. Thereby, in each stirring tank 1 and 5, it can control to predetermined dispersion force according to the objective.

  Moreover, the small volume stirring tank 5 may have a function of discharging the varnish at an arbitrary height. This function can set the discharge port of the small volume stirring tank 5 to an arbitrary height, and the resin varnish in the small volume stirring tank 5 is discharged at an arbitrary height. As a result, the liquid level of the resin varnish in the small volume agitation tank 5 does not become higher or lower than an arbitrary height, and the liquid level is stabilized and the resin varnish can be continuously stirred.

Is a schematic diagram showing the overall structure of the agitating tank and the circulation pipe resin varnish and configured ∎ You can butter varnish stirrer and a circulating pump provided on the circulation pipe equipped with a stirring blade. A resin varnish agitating device according to an embodiment of the present invention , comprising a resin varnish agitation tank having a stirring blade and a baffle plate on its side, a circulation pipe, and a circulation pump provided in the circulation pipe. It is the shown schematic diagram. Is a schematic diagram showing the overall structure of the agitating tank and the small-capacity stirred tank and circulation pipe of the resin varnish and configured ∎ You can butter varnish stirrer and a circulating pump provided on the circulation pipe equipped with a stirring blade.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Stirring tank 11 Stirring blade 12 Shaft 2 Circulation pipe 3 Circulation pump 4 Baffle plate 5 Small capacity stirring tank 51 Stirring blade

Claims (5)

In a resin varnish agitator that disperses a filler in a resin varnish and mixes the resin varnish , a resin varnish agitation tank having a stirring blade and a baffle plate on a side surface, a circulation pipe, and a circulation provided in the circulation pipe A discharge pipe located at the bottom of the baffle plate and located below the baffle plate and a feed port provided above the agitation tank are connected by a circulation pipe, and the circulation pipe and the inside of the agitation tank A circulation path is formed, and the resin varnish in the agitation tank is extracted from the outlet by the circulation pump, and is sent to the agitation tank from the inlet through the circulation pipe and swirled into the resin varnish in the agitation tank. A resin varnish stirrer characterized by the above. In the circulation path formed by the circulation pipe, there is provided a small-capacity agitation tank equipped with stirring blades whose capacity is 30% or less of the capacity of the agitation tank. The resin varnish stirrer according to claim 1, wherein the resin varnish stirrer is communicated . The resin varnish stirrer according to claim 2, wherein peripheral speeds of the stirring blades of the stirring tank and the small volume stirring tank can be variably controlled . The small-capacity stirring tank has a function of discharging the varnish at an arbitrary height, stabilizes the liquid level of the resin varnish in the small-capacity stirring tank, and continuously stirs the resin varnish. Or the resin varnish stirring apparatus of 3. The resin varnish agitator according to any one of claims 2 to 4, wherein the resin varnish is introduced into the small-capacity agitation tank by a circulation pipe from the bottom thereof .

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