JPH01262112A - Continuous mixing method of two-part cured resin - Google Patents

Abstract

PURPOSE:To prevent the generation of the retention of a resin, curing of which has advanced, in a mixing vessel by pushing a valve body open by a non-curing liquid and injecting a curing liquid into the mixing vessel when the other liquid is injected into the mixing vessel while one liquid of two-part cured resins is made to flow into the mixing vessel. CONSTITUTION:A resin being force-fed from a supply path 12 is fed into a mixing vessel 10 from an inflow port 14, and made to flow into an outflow port 16 by the pressure of the resin force-fed successively. On the other hand, a solvent force-fed through a solenoid valve 38 by a pump 42 pushes the valve body 32 of a check valve 30 open first and is injected from a filler hole 28. The solvent is injected into the mixing vessel 10 from the filler hole 28, the solenoid valve 38 is changed over instantaneously, and a curing agent force-fed by the pump 40 is poured into the mixing vessel 10 in place of the solvent. When the curing agent is injected, the curing agent more than required is not poured at a breath because the valve body 32 of the check valve 30 is pushed open previously by the solvent, and the curing agent is injected under a stable state.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for continuously mixing two-component curing resins, and particularly to a method for mixing two components at the time of starting up a mixing device.

[Conventional technology and issues to be solved]

Two-component curing resins are widely used to mold molded products such as resin films and sheets, and polyimide is an example of this two-component curing resin.

Examples include epoxy, urethane, phenol, and unsaturated polyester.

These two-component curable resins are two-component, for example, when a curing agent is mixed with the resin, the resin gradually reacts and the viscosity increases (hardening begins), eventually making it impossible to mold the resin. The time from when these two liquids are mixed until they can no longer be molded is called the pot life (pot life), and the pot life may be longer or shorter depending on the temperature, the mixed concentration of the two liquids, etc. In order to mold a resin molded product within this pot life, a continuous mixing device is placed in close proximity to the molding machine, and this continuous mixing device continuously mixes the two liquids and supplies the mixture to the molding machine. .

In order to mix the two components uniformly and quickly without generating air bubbles, the continuous mixing device continuously supplies one component of the two-component curing resin, such as resin, into a mixing container and stirs it. , another liquid, for example, a curing agent, is injected into the mixing container by pushing open the valve body of the check valve, which is energized by the urging means, with the injection pressure of the curing agent, thereby mixing the resin and the curing agent. Apparatus is provided for continuous mixing.

In such a continuous mixing device, during steady operation, the injection pressure of the curing agent is in balance with the force applied to the valve body of the check valve by the urging means, so that the curing agent is supplied at a constant flow rate. is injected into the mixing vessel.

However, at the time of startup, as shown in Figure 5, the injection pressure of the curing agent increases against the biasing force that biases the valve body.
After a certain peak value is reached and the valve body is pushed open, the pressure decreases while repeating up and down movements up to the pressure during steady operation, and then stabilizes at a nearly constant value.

At the start of operation when the valve body is pushed open, more hardening agent than the required amount is injected into the mixing container at once, resulting in a high mixed concentration of hardening agent. The pot life of the two highly concentrated mixed liquids has elapsed by the time they are discharged from the mixing container, and this hardened resin may remain in the mixing container and adhere thereto. The hardened resin is cut into small pieces by the stirring blades and gradually discharged, so if these foreign substances affect the quality of the molded product, the entire molded product may be defective. .

[Means to solve the problem]

The present invention has been made to solve these problems, and its gist is that when injecting another liquid, after pushing the valve body open with a non-hardening liquid, The curable liquid is then injected into the mixing container.

[For production]

According to the method of the present invention, when one part of the two-component curable resin is poured into the mixing container while the other part is injected into the mixing container, the first part is first separated from the other by a non-curing liquid. The valve body of the reversal valve is pushed open. Therefore, a large amount of non-hardening liquid is injected into the mixing container at once against the urging force applied to the valve body, but this non-hardening liquid causes one liquid to flow into the mixing container. Since the liquid is not cured, the liquid and the non-curable liquid are discharged from the mixing container in a mixed or separated state. The non-curing liquid pushes open the valve body of the check valve and in a stable state, the curable liquid is injected into the mixing container after the non-curing liquid, so more curable liquid is injected than the required amount. It will not be done.

Of the two liquids discharged from the mixing container, a certain amount of the part into which the non-hardening liquid was injected will be discarded, but the hardened resin will be cut into small pieces, which can cause defects in molded products. A situation where the liquid is gradually discharged will not occur.

〔Example〕

Next, embodiments of the present invention will be described in detail with reference to drawings showing an example of a continuous mixing device.

In FIGS. 1 and 2, reference numeral 10 is a mixing container of a continuous mixing device that continuously stirs and mixes two liquids, and one end of the mixing container 10 is filled with a resin fed under pressure from a supply path 12. An inlet 14 for supplying the air is provided, and
A nozzle-shaped outlet 16 is provided at the other end.

On the inner surface of the mixing container 10, a plurality of cylindrical static stirring blades 18 protruding approximately radially inward are disposed on the same circumference at approximately equal intervals, and a plurality of cylindrical static stirring blades 18 are disposed on the same circumference at approximately equal intervals. A plurality of rows (multiple stages) of static blade rows 20 consisting of static stirring blades 18 of
It is located throughout.

A rotor 22 is housed inside the mixing container 10 and is rotated on the same axis as that of the mixing container 10.
The rotor 22 is rotationally driven by a drive device (not shown). On the outer surface of the rotor 22, a plurality of dynamic stirring blades 24 protruding approximately radially outward are arranged on the same circumference at approximately equal intervals, and a plurality of dynamic stirring blades 24 are arranged on the same circumference. 24 rotor blade rows 26 are arranged in multiple rows (
(multiple stages). The dynamic stirring blades 24 are formed by cutting a disc, for example, and then fixed to the outer periphery of the rotor 22 by press fitting, shrink fitting, etc., or in the case of a small size, the dynamic stirring blades 24 and the rotor 22 are integrally formed. It is also possible to do so.

Therefore, the rotor blade rows 26 are rotationally driven together with the rotor 22 between the stator blade rows 20 .

Static stirring blades 18 arranged on the inlet 14 side of the mixing container 10
One of the holes has an inlet 28 that opens radially inward.
is formed so that the curing agent is injected toward the center of the mixing container 10, that is, toward the rotor 22 side.

The other end of the inlet 28 is integrally equipped with a check valve 30, as shown in an enlarged view in FIG.
0 is prevented from flowing back from the injection port 28. The check valve 30 has a conical valve body 32 urged against a valve seat 36 by the urging force of a spring 34 via a rod 33.
When the fluid is pumped, the pressure causes the spring 34 to
The valve body 32 is pushed open from the valve seat 36 against the urging force of the valve body 32 . The check valve 30 is connected to a pump 40 that pumps a curing agent through an electromagnetic valve 38 and a pump 42 that pumps a solvent. [Category 1] can be switched instantly.

Note that an outer cylinder 44 is attached to the outside of the mixing container 10, and a fluid such as a refrigerant is flowed between the outer cylinder 44 and the mixing container 10, so that the inside of the mixing container 10 is always kept at a constant temperature. It's like that. Further, reference numeral 46 is a mechanical seal, which prevents the resin fed under pressure from the supply path 12 from leaking from between the mixing container 10 and the shaft 48 of the rotor 22.

In the continuous mixing device having such a configuration, the supply path 1
The resin pressure-fed from 2 flows into the mixing container 1 from the inlet 14.
The pressure of the resin that is supplied into the resin 0 and successively pumped causes it to flow to the outlet 16.

On the other hand, from the injection port 28, the solvent is first forced by the pump 42 through the electromagnetic valve 38, and is injected by pushing the valve body 32 open against the biasing force of the spring 34 of the check valve 30. After the solvent is injected into the mixing container 10 from the injection port 28, the electromagnetic valve 38 is instantly switched, and the curing agent pumped by the pump 40 instead of the solvent is added to the mixing container 1.
Injected into 0. When the curing agent is injected, the check valve 30
Since the valve body 32 has already been pushed open by the solvent, more hardening agent than the required amount is not injected all at once, and the hardening agent is injected in a stable state.

Therefore, first, the solvent injected from the injection port 28 is mixed with the resin in the mixing container 10, and is discharged from the outflow port 16 with the viscosity of the resin reduced. Next, instead of the solvent, a fixed amount of hardening agent is injected from the injection port 28 and is stirred with the resin by the stirring blades 18 and 24, and the resin with the hardening agent mixed uniformly is gradually hardened and discharged from the outlet 16. be done.

As described above, according to the method of the present invention, a large amount of curing agent is not injected into the mixing container when the continuous mixing device is started, so that the hardened resin remains in the mixing container and causes problems. There will be no situation where this happens.

Although one embodiment of the present invention has been described in detail above, the present invention is not limited to the above-described embodiment, and can be implemented in other embodiments.

For example, as shown in FIG. 4, the check valve 50 is connected to a conduit passage 52 through which the curing agent is conducted, a conduit passage 54 through which the solvent is conducted, and the curing agent and solvent flowing through these conduit passages 52 and 54. Check valve 56, 58 and valve body 3 that regulate the flow in one direction
It may also be configured to include a cavity 60 formed by 2.

In this example, a solvent is first filled into the cavity 60 from the conduit 54 with the check valve 56 closed, and then a curing agent is pumped through the conduit 52 with the check valve 58 closed. The pressure of the solvent in the cavity 60 is increased by the pressure of the curing agent, and the valve body 32 resists the biasing force of the spring 34 and presses against the valve seat 3.
It can be pushed open from 6. At this time, the solvent filled in the cavity 60 is first injected into the mixing container 10 from the injection port 28, and then the curing agent is continuously injected from the conduction path 52 while filling the cavity 60. . Here, the amount of solvent is the check valve 5
It is sufficient to allow a drastic increase in the amount of injection due to pressure fluctuations when the valve body 32 is opened, and various settings can be made depending on the volume of the empty space 60 filled with solvent. It is. Furthermore, the structure of the check valves 56 and 58 can be set in various ways.

According to this example, the amount of solvent injected is small, and there is an advantage that the amount of resin that is discarded due to mixing with the solvent is reduced.

In the above embodiments, the case where the valve opening operation of the valve body 32 is performed using a solvent has been illustrated, but not only a solvent but also a solution in which a curing agent is mixed with a solvent to reduce its function as a curing agent, or a resin may be used. It may be a fluid that is not reactive or compatible at all; in short, it is sufficient that the curing of the resin is not promoted by increasing the amount of injection, and a non-curing liquid should be interpreted in this way. be.

Further, the above-mentioned continuous mixing device is just an example, and a device that continuously stirs and mixes the two liquids using a spiral blade may be used, or a device that uses a propeller or a rotary disk to continuously mix two liquids. The present invention is applied to a device.

Furthermore, the structure of the check valve is not limited to the above-mentioned embodiments; for example, there may be a type that does not use a ronde, or a type that uses other elastic members, magnetic force, compressed air, etc. instead of a spring as a biasing means. etc. is also fine.

In addition, a sensor is installed on the valve body or rond of the check valve, and the sensor detects when the valve body is seated on the valve seat, and the fluid flowing into the check valve and inlet is changed from the curing agent to the solvent. The present invention can be implemented with various modifications, improvements, and modifications based on the knowledge of those skilled in the art without departing from the spirit thereof, such as being able to be configured to be switched.

〔Effect of the invention〕

In the present invention, when continuously mixing two-component curable resins, the valve body of the check valve is pushed open with a non-curing liquid, and then the curable liquid is pumped into the mixing container. Since the liquid is injected into the mixing container at once when the valve body is opened, the curing of the two-component curing resin is not accelerated. There is no possibility that the two-component curing resin that has been mixed continuously by the method of the present invention will be stagnated and adhered, and the resin will not be cut into small pieces and gradually discharged from the mixing container. If a resin molded product such as a film is formed using the resin molded product, it becomes possible to provide a product with excellent surface condition and properties, and furthermore, has a low internal defect and is free from internal defects.

[Brief explanation of the drawing]

Fig. 1 is a front sectional view of the main part showing an example of a continuous mixing device to which the method of the present invention is applied, Fig. 2 is a plan sectional view of Fig. 1, and Fig. 3 is an enlarged sectional view of the main part of Fig. 1. be. FIG. 4 is an enlarged sectional view of a main part showing another embodiment of the present invention. FIG. 5 is a pressure-time diagram for explaining problems caused by the conventional continuous mixing method. 10; Mixing container 28; Inlet 30.50; Check valve 32; Valve body 34; Spring (biasing means) 40.42; Pump 60; Vacant patent applicant Kanekabuchi Chemical Co., Ltd. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5

Claims (2)

[Claims] (1) One part of the two-component curing resin is continuously supplied and stirred into the mixing container, and the other part is energized by the energizing means and the valve body of the check valve is moved to the other part. In the method of continuously mixing the one liquid and the other liquid by pushing it open under pressure and injecting it into the mixing container, when injecting the other liquid, a non-hardening liquid is added. A continuous mixing method for a two-component curable resin, characterized in that after the valve body is pushed open with a liquid, a curable liquid is subsequently injected into a mixing container. (2) The two-component curable resin according to claim 1, wherein the non-curing liquid is the one-component solvent, a mixture of the solvent and a curing agent, or a liquid that does not react with the one-component. continuous mixing method.