JP2001340741A - Continuous mixer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a continuous mixer suppressing the proceeding of curing by strong stirring to uniformly mix after mixing a reaction type curable resin and a hardener, and suppressing the generation of stirring heat, to provide the uniform resin mixture to flow out of a cylindrical vessel and then to obtain resin films or sheets without any defect. SOLUTION: This continuous type mixer is constituted by reducing the respective thicknesses of dynamic stirring vanes 24 and static stirring vanes 18 and regulating the total thickness to a range of 40 to 70% of the intervals of the dynamic vane or static vane arrays.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuous mixing apparatus for continuously mixing plural kinds of fluids such as synthetic resin, solvent, and curing agent in a fluid state.

[0002]

2. Description of the Related Art In molding molded articles such as resin films and resin sheets, reaction-curable resins are often used. Examples of the reaction-curable resins include polyimide, epoxy, and the like.
Examples include urethane, phenol, and unsaturated polyester.

When these reaction-curable resins are mixed in two liquids, for example, a resin, a curing agent is gradually reacted to increase the viscosity (curing starts), and finally molding cannot be performed. The time after the mixing of the two liquids until the molding cannot be performed is called a pot life (pot life), and the pot life becomes longer or shorter depending on the mixing concentration and the temperature of the two liquids. Therefore, it is necessary to mix the two liquids as quickly and uniformly as possible at a low temperature after the start of mixing, and to flow out of the continuous mixing apparatus.

Conventionally, such a mixing device is provided with a static stirring blade and a dynamic stirring blade, and agitates while flowing the resin from the inlet to the outlet of the cylindrical container. The mixing device is provided on the side wall of the cylindrical container. Japanese Patent Application Laid-Open Nos. 1-236928, 1-207121 and 1-263012 disclose a continuous mixing apparatus in which a curing agent is injected from an inlet to mix a resin and a curing agent. ing.

In this conventional apparatus, the ratio of the thickness of the static stirring blade or the dynamic stirring blade to the interval between the stationary blade row or the moving blade row is about 45%. The ratio of the total thickness of the static stirring blade and the dynamic stirring blade was also about 90%. That is, in the conventional apparatus, the static stirring blades and the dynamic stirring blades were arranged in a considerably close state, and the resistance of the fluid due to the rotation of the dynamic stirring blades was large.

As described above, in the conventional apparatus, since the static stirring blade and the dynamic stirring blade are arranged in close proximity to each other and the resistance of the fluid is large, the rotation of the dynamic stirring blade cannot be increased. Was taking a long time. In particular, when the discharge amount is increased, or when the mixing ratio of the curing agent is increased, the resin cannot be uniformly stirred, and the resin flows out of the continuous mixing apparatus while being non-uniform, thereby causing defects in the resin film or the resin sheet. There was a problem.

In order to quickly and uniformly mix the resin and the curing agent, it is effective to increase the rotation. However, since the static stirring blade and the dynamic stirring blade are arranged in close proximity as described above. And it had its limits. That is, increasing the rotation increases the generation of heat of stirring, increases the temperature, and shortens the pot life. as a result,
Curing occurred in the mixing equipment, sometimes causing defects.

On the other hand, when the thickness of the static stirring blade and the dynamic stirring blade is reduced and the interval between the stirring blades is increased (widened), the resistance of the fluid accompanying rotation of the dynamic stirring blade decreases, and the dynamic stirring blade The generation of heat of agitation can be suppressed even if the rotation speed of the is increased. However, with such a configuration, the resin flows out of the outlet in a state where the two liquids are not sufficiently mixed. In particular, when the discharge amount is increased or when the mixing ratio of the curing agent is increased, the resin cannot be uniformly stirred, and the resin flows out of the mixing device in a non-uniform state, thereby causing defects in the resin film or the resin sheet. was there.

[0099]

SUMMARY OF THE INVENTION The present inventors have found that such conventional problems, that is, if the stirring blades are too close, the rotation speed cannot be increased, and if the spacing between the stirring blades is too large,
In order to cope with the problem that the resin comes out of the outlet without being sufficiently mixed, the thickness of each stirring blade is set to an optimum range.

[0010]

SUMMARY OF THE INVENTION The gist of the continuous mixing apparatus according to the present invention is as follows. A cylindrical container having an inlet at one end and an outlet at the other end is substantially coaxial with the cylindrical container. A plurality of static stirring blades projecting inward in the radial direction are arranged in a plurality of rows inside the cylindrical container, and are arranged in the cylindrical container, and are rotated on the axis of the cylindrical container. Rotor, a plurality of moving agitating blades protruding substantially radially outward on the same circumference, on the outer surface of the rotor, a plurality of rotor blade rows arranged alternately with the stationary blade row, A continuous mixing apparatus provided on a side wall of the cylindrical container on the inflow side and having an inlet opening into the cylindrical container, wherein the mixing device is arranged with respect to an interval between the stationary blade row or the moving blade row. The sum of the thickness of the dynamic stirring blade and the thickness of the static stirring blade is in the range of 40% to 70%.

Further, the gist of the present invention is that the ratio of the thickness of the static stirring blade or the dynamic stirring blade is set in the range of 20% to 30% of the interval between the stationary blade row or the moving blade row. I did it. Further, the gist of the present invention resides in that the dynamic stirring blade is provided with a slope at a position where the resistance from the fluid due to the rotation of the dynamic stirring blade is reduced.

In the apparatus of the present invention, the resin, which is a fluid flowing from the inlet, and the curing agent injected from the inlet are mixed in the cylindrical container by the static stirring blade and the dynamic stirring blade. It flows inside the container and flows out of the outlet.

At this time, by setting the thickness of the stirring blade in the above-mentioned range, the stirring resistance becomes appropriate, and the generation of stirring heat is suppressed. As a result, the rotational speed of the dynamic stirring blade can be increased, stirring can be performed more quickly and uniformly, and as a result, generation of defects can be eliminated. or,
Since the inclined surface is provided on the dynamic stirring blade at a position where the resistance from the fluid due to the rotation of the dynamic stirring blade is reduced, the generation of defects can be further reduced.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of a continuous mixing apparatus according to the present invention will be described in detail with reference to FIGS.

1 to 4, reference numeral 10 denotes a cylindrical container of a continuous mixing apparatus. One end of the cylindrical container 10 is provided with an inflow port 14 to which synthetic resin is supplied, and the other end is provided. A nozzle-shaped outlet 16 is provided. A plurality of static stirring blades 18 projecting substantially inward in the radial direction are provided on the inner surface of the cylindrical container 10 at substantially equal intervals on the same circumference, and a plurality of static stirring blades 18 are provided on the same circumference. A stationary blade row 20 composed of the stirring blades 18 is provided over a plurality of rows (a plurality of stages).

An outer cylinder 29 is attached to the outside of the cylindrical container 10, and a fluid such as a refrigerant flows between the outer cylinder 29 and the cylindrical container 10, so that the cylindrical container 10 is always fixed. Is kept at a low temperature.

On the other hand, inside the cylindrical container 10, a rotor 22 that is rotated on the same axis as the axis of the cylindrical container 10 is housed. The rotor 22 is rotatably supported by a bearing (not shown), and is rotated by a driving device (not shown).

On the outer surface of the rotor 22, a plurality of dynamic stirring blades 24 projecting substantially radially outward are arranged on the same circumference at substantially equal intervals, and are arranged on the same circumference. A moving blade row 26 composed of a plurality of moving stirring blades 24 is arranged in a plurality of rows (a plurality of stages) so as to be alternate with the stationary blade rows 20 arranged on the inner surface of the cylindrical container 10.

As shown in FIGS. 3 (a) and 3 (b), the dynamic stirring blade 24 is formed such that the corners of the side edges forming the diagonal of the tip end are cut off as shown in FIGS.

Further, an injection port 28 is formed in a part of the static stirring blade 18 disposed on the inflow port 14 side of the cylindrical container 10. As shown in FIG. 2, the injection port 28 is provided at the tip side edge of the static stirring blade 18 so as to be injected in the rotation direction (clockwise in FIG. 2) of the dynamic stirring blade 24.

Then, a hardening agent is injected from the central portion to the inner peripheral portion of the cylindrical container 10 through the injection port 28,
The resin is planarly injected into the resin which is stirred concentrically by the dynamic stirring blade 24. Since the resin is allowed to flow continuously from the inflow port 14, the curing agent is spirally injected into the resin.

Here, as shown in FIG.
Has a columnar shape. On the other hand, as shown in FIG. 3, the dynamic stirring blade 24 is formed into a hexagonal prism by cutting the corners of the diagonal side edges of the quadrangular prism to form slopes 30 and 34. Then, the dynamic stirring blade 24 rotates in the direction Y in which the flow X of the fluid such as resin fed from the inlet 14 is cut.

When the dynamic stirring blade 24 rotates, the dynamic stirring blade and the fluid violently collide with each other and generate heat. Further, the fluid bent in the rotating direction by the dynamic stirring blade 24 then violently collides with the static stirring blade 18 to generate heat. However, if the thickness of the dynamic stirring blade 24 or the static stirring blade 18 is small, the collision resistance becomes small, and the calorific value becomes small. In addition, dynamic stirring blade 24
Is the slope 3 with the corners of the diagonal side edges of
Since 0 and 34 are formed, it is possible to reduce the resistance from the fluid due to the rotation of the dynamic stirring blade 24.

Therefore, even with high-speed stirring, a small resistance (power) is required, and the calorific value is small. Therefore, if the thicknesses of the dynamic stirring blade 24 and the static stirring blade 18 are appropriately selected, an optimum stirring state can be created.

In the continuous mixing apparatus according to the above configuration, first, the resin is pressurized from the inflow port 14 and continuously flows into the cylindrical container 10 while the rotor 22 is rotated by a driving device (not shown). Next, a curing agent is injected into the resin from the injection port 28. In the cylindrical container 10, the resin and the curing agent are cut by being sandwiched between the static stirring blades 18 and the dynamic stirring blades 24, and subsequently pressed together by the resin and the curing agent that are continuously fed while being fused. To the outlet 16 side.

When the mixture of the resin and the curing agent is cut by the stirring blade, the resistance is reduced because the thickness of the dynamic stirring blade is smaller than that of the conventional continuous mixing apparatus. As a result, heat generation due to stirring resistance is reduced, and the number of revolutions of the dynamic stirring blade can be greatly increased.

With this continuous mixing device, the mixture of the resin and the curing agent that has been stirred and mixed is uniformly mixed in the same manner as in a conventional continuous mixing device. After mixing, the mixture of the resin and the curing agent is discharged from the outlet 16 and supplied to the molding step.

As described above, the continuous mixing apparatus according to the embodiment requires less heat due to the stirring resistance even at a high rotation speed than the conventional apparatus, and has the same stirring and mixing capacity while maintaining a low temperature. Is obtained. Therefore, stirring can be performed at a lower temperature than in the conventional apparatus, and the pot life can be extended.

Although the embodiment of the continuous mixing apparatus according to the present invention has been described above, the present invention is not limited to the above-described embodiment.

For example, the sectional shape of the dynamic stirring blade and / or the static stirring blade is not limited to a square or a circle but may be an ellipse or a semicircle, and is not particularly limited. The arrangement and combination of the dynamic stirring blade and the static stirring blade are not limited to the examples.

As the resin to which the continuous mixing device according to the present invention is applied, polyimide, epoxy, urethane,
Reaction-curable resins such as phenol and unsaturated polyester are preferred. The continuous mixing apparatus of the present invention is most suitable for mixing a resin and a curing agent when molding a molded article such as a resin film or a resin sheet using these reaction-curable resins. And the like can be used for mixing.

The present invention can be embodied in variously modified, modified, and modified forms based on the knowledge of those skilled in the art without departing from the spirit of the present invention. Things.

[0033]

Next, the present invention will be described in detail with reference to examples, but the present invention is not limited to these examples.

Example 1 In the continuous mixing apparatus shown in FIG. 1, the spacing between the moving blade row or the stationary blade row (hereinafter referred to as a blade row) is 16 mm as shown in FIG. The thickness of the stirring blade 18 is 4% of 25% of 16 mm, the thickness of the dynamic stirring blade 24 is 4 mm of 25% of 16 mm, and the total thickness of the dynamic stirring blade and the static stirring blade is 8 mm. 50%.

Using this continuous mixing apparatus, a polymer structure in which pyromellitic anhydride and diaminodiphenyl ether are alternately linked, at a temperature of 8 ° C. and a viscosity of 900 Pa · s
s, a polyamic acid DMF solution having a flow rate of 260 L / Hr,
Temperature -10 ° C, viscosity 0.1Pa · s, flow rate 120L /
The acetic anhydride DMF solution of Hr was added to the rotating agitating blade 24 at a rotation speed of 5
Mixing experiments were performed at 00 rpm. As a result, the temperature of the fluid inside the continuous mixing apparatus is -4 ° C, and even if the apparatus is continuously operated for 24 hours, no hardened material is generated inside the mixing apparatus, and the mixture can be uniformly stirred without any defects. No defect was generated.

(Example 2) In the same continuous stirring device as in Example 1, as shown in FIG. 6, the blade row interval was 16 mm, and the thickness of the static stirring blade 18 was 4 mm, which is 25% of 16 mm. The thickness of the dynamic stirring blade 24 is 7 mm, which is 44% of 16 mm, and the total thickness of the dynamic stirring blade and the static stirring blade is 11 mm,
It was about 69% of the cascade spacing.

Using this continuous stirrer, a temperature of 8 ° C., a viscosity of 900 Pa · s and a flow rate of 260 L /
Hr polyamic acid DMF solution and acetic anhydride DM at a temperature of -10 ° C, a viscosity of 0.1 Pa · s and a flow rate of 120 L / Hr
A mixing experiment was performed on the F solution at a rotation speed of the dynamic stirring blade 24 of 500 rpm. As a result, the temperature of the fluid inside the continuous mixing apparatus is 0 ° C., and even when the apparatus is continuously operated for 24 hours, no hardened material is generated inside the mixing apparatus, and the mixture can be uniformly stirred without any defects, and can be molded. No defects occurred.

Example 3 In a continuous stirring apparatus similar to Example 1, as shown in FIG.
m, and the thickness of the static stirring blade 18 is 7%, which is 44% of 16 mm.
m, and the thickness of the dynamic stirring blade 24 is 4%, which is 25% of 16 mm.
m, and the total thickness of the dynamic stirring blade and the static stirring blade was 11 mm, which was about 69% of the interval between the blade rows.

Using this continuous mixing apparatus, a temperature of 8 ° C., a viscosity of 900 Pa · s, and a flow rate of 260 L /
Hr polyamic acid DMF solution and acetic anhydride DM at a temperature of -10 ° C, a viscosity of 0.1 Pa · s and a flow rate of 120 L / Hr
A mixing experiment was performed on the F solution at a rotation speed of the dynamic stirring blade 24 of 500 rpm. As a result, the temperature of the fluid inside the continuous mixing apparatus is 0 ° C., and even when the apparatus is continuously operated for 24 hours, no hardened material is generated inside the mixing apparatus, and the mixture can be uniformly stirred without any defects, and can be molded. No defects occurred.

(Comparative Example 1) In a continuous mixing apparatus similar to that in Example 1, as shown in FIG.
m, and the thickness of the static stirring blade 48 is 7%, which is 44% of 16 mm.
m, and the thickness of the dynamic stirring blade 42 is 7%, which is 44% of 16 mm.
m, and the total thickness of the dynamic stirring blade and the static stirring blade was 14 mm, which was about 88% of the interval between the blade rows.

Using this continuous mixing apparatus, the same temperature as in Example 1 was used: 8 ° C., viscosity: 900 Pa · s, flow rate: 260 L / H
r with a polyamic acid DMF solution and acetic anhydride DMF at a temperature of -10 ° C, a viscosity of 0.1 Pa · s, and a flow rate of 120 L / Hr
A mixing experiment was performed on the solution at a rotational speed of the dynamic stirring blade 42 of 400 rpm. As a result, the temperature of the fluid inside the mixing device is 5
When the temperature was raised to 0 ° C. and the operation was continuously performed for 24 hours, a cured product was generated inside the mixing apparatus, and defects occurred in the molded product.

(Comparative Example 2) In a continuous mixing apparatus similar to that in Example 1, as shown in FIG.
m, and the thickness of the static stirring blade 49 is 3% of 19% of 16 mm.
m, and the thickness of the dynamic stirring blade 43 is 3% of 19% of 16 mm.
m, and the total thickness of the dynamic stirring blade and the static stirring blade was 6 mm, which was about 38% of the interval between the blade rows.

Using this continuous mixing apparatus, the same temperature as in Example 1 at 8 ° C., a viscosity of 900 Pa · s, and a flow rate of 260 L / H were used.
r with a polyamic acid DMF solution, acetic anhydride DMF at a temperature of -10 ° C, a viscosity of 0.1 Pa · s, and a flow rate of 120 L / Hr
A mixing experiment was performed on the solution at a rotation speed of the dynamic stirring blade 43 of 600 rpm. As a result, the temperature of the fluid inside the mixing device becomes-
6 ° C. However, the stirring capacity was insufficient, and immediately after the start of the operation, the resin in a state of being not uniformly stirred flowed out of the outlet of the mixing device, and could not be molded.

As apparent from the three examples and the two comparative examples, the present invention is to reduce the ratio of the total thickness of the dynamic stirring blade and the static stirring blade to the spacing of the stationary blade row or the moving blade row by 40%. It is understood that it is sufficient to set the range to 70%. Further, the total ratio of the thickness of the static stirring blade and the dynamic stirring blade is 40% to 70%.
%, And keeping the ratio of the thickness of one of the static stirring blade or the dynamic stirring blade to 2 of the interval between the stationary blade row or the moving blade row.
It can be seen that the range may be 0% to 30%. However, the optimum range of the present invention is 50% of the total thickness of the dynamic stirring blade and the static stirring blade with respect to the interval of the stationary blade row or the moving blade row.
% To 70%. Further, the ratio of the thickness of the static stirring blade or the dynamic stirring blade is in the range of 25% to 30% of the interval between the stationary blade row or the moving blade row.

As described above, in the present invention, when the above range is exceeded, the problems described in the conventional apparatus occur.
If it exceeds 0%, the flow resistance increases and the rotation speed of the stirring cannot be increased, so that curing occurs and the pot life is shortened. Conversely, if it is less than 40%, the number of rotations will be increased,
Insufficient agitation results in non-uniform resin flowing out of the mixing device. Further, when the thickness of the dynamic stirring blade and the static stirring blade is set to 20% or less, the stirring blade becomes too thin as a result, and there is a problem that mechanical strength cannot be obtained.

[0046]

According to the present invention, the ratio of the total thickness of the dynamic stirring blade and the static stirring blade to the interval of the stationary blade row or the moving blade row is in the range of 40% to 70%. The temperature rise of the fluid inside the container can be suppressed, the pot life is prolonged, and the hardening inside the mixing device is suppressed. Therefore, the number of rotations of the dynamic stirring blade can be increased, and stirring can be performed more quickly and uniformly. As a result, there is almost no occurrence of defects in the resin film or the resin sheet.

Further, according to the present invention, the dynamic stirring blade is provided with a slope at a position where the resistance from the fluid due to the rotation of the dynamic stirring blade is reduced, so that the generation of stirring heat can be further suppressed and the number of rotations can be increased. The effect is obtained.

[Brief description of the drawings]

FIG. 1 is an explanatory front sectional view of a continuous mixing apparatus to which the present invention is applied.

FIG. 2 is an explanatory plan sectional view of the continuous mixing apparatus shown in FIG.

FIG. 3 is an explanatory view of one embodiment of a dynamic stirring blade used in the continuous mixing apparatus according to the present invention, wherein (a) is a plan view and (b)
FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 4 is an enlarged explanatory view showing one embodiment of a positional relationship between a dynamic stirring blade and a static stirring blade used in the continuous mixing apparatus according to the present invention.

FIG. 5 is an explanatory view of a main part corresponding to Example 1 of the continuous mixing apparatus according to the present invention.

FIG. 6 is an explanatory view of a main part corresponding to a second embodiment of the continuous mixing apparatus according to the present invention.

FIG. 7 is an explanatory view of a main part corresponding to Example 3 of the continuous mixing apparatus according to the present invention.

FIG. 8 is an explanatory view of a main part corresponding to Comparative Example 1 for comparison with an example of the present invention.

FIG. 9 is an explanatory view of a main part corresponding to Comparative Example 2 for comparison with an example of the present invention.

[Explanation of symbols]

 10; cylindrical container 14; inlet 16; outlet 18, 48, 49; static stirring blade 20; stationary blade row 22; rotor 24, 42, 43; dynamic stirring blade 26; 34; Slope

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4F201 BA01 BC02 BC13 BK02 BK14 BK52 BK53 BK54 BK73 4G035 AB38 AB41 AE13 4G078 AA03 AA04 AA26 AB06 BA05 BA09 CA01 CA08 DA17 EA10

Claims (4)

[Claims] 1. A cylindrical container having an inlet at one end and an outlet at the other end, and a plurality of static stirring blades protruding substantially radially inward on the same circumference are provided inside the cylindrical container. A plurality of rows of stationary blades, a rotor housed in the cylindrical container, and a rotor rotatable on the axis of the cylindrical container, and a plurality of protruding radially outer circumferences on the same circumference. A plurality of moving blades are arranged on the outer surface of the rotor so that the moving blades are arranged alternately with the plurality of stationary blades, and are provided on a side wall of the cylindrical container on the inflow side, and inside the cylindrical container. Wherein the total ratio of the thickness of the dynamic stirring blade and the static stirring blade to the interval of the stationary blade row or the moving blade row is 40% to 70%. %. 2. The continuous mixing according to claim 1, wherein the ratio of the thickness of the static stirring blade is set in a range of 20% to 30% of the interval between the stationary blade row or the moving blade row. apparatus. 3. The continuity according to claim 1, wherein a ratio of a thickness of the dynamic stirring blade is set in a range of 20% to 30% of an interval between the stationary blade row or the moving blade row. Type mixing device. 4. The continuous type as claimed in claim 1, wherein the dynamic stirring blade is provided with a slope at a position where the resistance from the fluid due to the rotation of the dynamic stirring blade is reduced. Mixing equipment.