JPH04118035A - Mix-stirring apparatus - Google Patents

Abstract

PURPOSE:To prevent sticking of a mixed liquid in a chamber or in a discharge tube to the inner wall caused by hardening in a short time and to stably execute mix-stirring of the liquid material for a long time by decreasing the place where the liquid material is stagnated or retained as less as possible and executing cooling not only inside of the chamber but also inside of the discharge tube. CONSTITUTION:Two or more kinds of the liquid materials in the chamber 1a is stirred with plural projecting parts 7b in a rotor 7 while flowing down along the inner wall of the chamber and mutually mixed. Then, the mixed liquid is cooled with coolant flowing in peripheral cooling jackets 5, 6 to restrain chemical reaction and heat generation at the time of mixing. This mixed liquid is sufficiently stirred and at the time of reaching the bottom part of the chamber, is fed to the discharge tube 3a, and at the same time, is stirred with plural blade parts 9 arranged at the lower end part of the rotor, then retaining of the mixed liquid at the bottom part of the chamber is prevented. Then, in the discharge tube, the mixed liquid is fed with a screw lever 10 toward a discharge hole at the lower end thereof the at the same time, the fed mixed liquid is stirred.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention is applicable to molding of molds, etc. by stirring and mixing two or more types of liquid materials when molding resin products using resin liquids such as polyurethane resin solutions. The present invention relates to a mixing and stirring device for discharging (injecting) liquid, and more specifically, to a device suitable for mixing and stirring a thermosetting resin liquid that hardens at high temperatures (100° C. or higher).

[Prior Art] For example, when molding a polyurethane cleaning plate for an electrophotographic copying machine using a mold, the resin liquid used as the raw material is mixed with a urethane prepolymer and a curing agent such as a low molecular weight polyol. It is generally used after stirring.

The present applicant has already developed an apparatus having the following structure as an apparatus for mixing and stirring two or more types of liquid substances as described above and injecting the mixture into a mold. That is, as shown in FIG. 4, a stirring rotor 57 is disposed in the chamber 51 and is supported by a rotating shaft 58 from the upper end, and a plurality of inlets provided at the upper end of the chamber 51 are provided. A liquid substance is introduced from 52 and 53, mixed and stirred by a rotor 57, and then discharged from a discharge pipe 54 provided at the lower end of the chamber.

A large number of protrusions 57a are provided at intervals on the side peripheral surface of the rotor 57, and the lower end of the rotor 57 is formed into a conical shape corresponding to the bottom shape of the chamber. Furthermore, around the chamber 51 except for the bottom: cooling jacket 5
5 is provided.

[Problems to be Solved by the Invention] The mixing and stirring device shown in FIG. When mixing and stirring the slow curing agent into the tumble polymer, the temperature of the liquid material rises significantly or the reaction is suddenly accelerated, so that the liquid material hardly hardens and adheres to the inside of the chamber 5. .

However, when trying to mix and stir a fast-curing resin liquid in order to significantly shorten the molding time of resin products to improve production efficiency and reduce manufacturing costs, the above equipment does not work as described below. A problem arose. That is, a curing agent such as an imidazole type curing catalyst is added to the curing agent such as a low molecular weight polyol, which is mixed with the urethane prepolymer and stirred, and then intermittently discharged into a plurality of predetermined molds in order. Then, the mixed liquid gradually gels and adheres to the inner wall of the chamber and the vicinity of the discharge port, and from 7 to 1
The discharge amount decreased in 0 minutes, and a ratio failure of the mixed liquid occurred.

The main reason for this is that in the mixing and stirring device shown in Fig. 4, there is a kind of dead space in the gap between the inner wall of the chamber 51 and the stirring rotor 57, and the flow of the mixed liquid stagnates in the dead space. ■Discharge pipe 54
Since the cooling jacket 55 is not provided around the mixed liquid, it is considered that the mixed liquid is likely to harden when discharging is stopped.

This invention was made in view of the above-mentioned points, and it solves the above-mentioned problems in the mixing and stirring device shown in FIG. It is an object of the present invention to provide a mixing and stirring device that does not harden and adhere, stably performs mixing and stirring for a long time, and can improve the production efficiency of resin products.

[Means for Solving the Problems] In order to achieve the above object, the mixing and stirring device of the present invention has the following features:
a) A stirring rotor is supported at the center of the upper end and rotatably disposed in the chamber of the main body of the device, which has a liquid material inlet at the upper end and a liquid material discharge pipe at the center of the lower end. 2
A mixing and stirring device that stirs and mixes and discharges more than one type of liquid material, wherein b) the bottom of the chamber is inclined toward the inlet of the discharge pipe, and c) the rotation is made into a shape corresponding to the shape of the bottom. d) a plurality of blades for transporting the liquid are provided at the lower end of the rotor so as to be inclined in a direction in which the liquid is transported to the discharge pipe during forward rotation; e) the rotor f) a threaded rod with a threaded portion carved in the direction in which the liquid material is discharged during forward rotation is provided protrudingly in the center of the lower end of the rotor, and is inserted into the discharge pipe; Insert
g) Around the chamber and discharge pipe of the device main body,
A cooling jacket is provided.

[Function] According to the mixing and stirring device of the present invention having the above configuration, two or more types of liquid substances introduced into the chamber are stirred by the numerous protrusions of the rotor while flowing down along the inner wall of the chamber, mixed with each other.

At this time, the mixed liquid (resin liquid) is cooled by the cooling medium flowing into the surrounding cooling jacket, and chemical reactions and heat generation during mixing are suppressed. When the mixed liquid is sufficiently stirred and reaches the bottom of the chamber, it is sent to the discharge pipe and stirred at the same time by multiple blades provided at the lower end of the rotor, so that the mixed liquid remains at the bottom of the chamber. is prevented. In the discharge pipe, the mixed liquid is sent toward the discharge port at the lower end of the pipe by a threaded rod and is stirred at the same time.

In addition, the mixed liquid is cooled by the cooling medium flowing into the cooling jacket around the chamber and the discharge pipe,
Chemical reactions and heat generation during mixing are suppressed. Therefore, when discharging mixed and stirred liquid mixture intermittently to a large number of molds, even if the discharge of the mixed liquid is temporarily stopped, the mixed liquid will not harden or adhere in the discharge pipe or near the entrance of the discharge pipe. blocked.

[Example code] Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a partially sectional front view showing a mixing and stirring device according to an embodiment, FIG. 2 is a plan view of a rotor, and FIG. 3 is a bottom view of the rotor.

As shown in FIG. 1, the device main body 1 includes a cylindrical body casing 2 having an inner circumferential wall whose diameter is gradually reduced in the downward direction.
And, the backing 1 is attached to the lower end opening of the body casing 2.
a hemispherical bottom casing 3 connected via 1;
The lid body 4 is connected to the upper end opening of the body casing 2 via a backing 12.

An opening 4a is provided in the center of the lid 4, and an inlet 4b for liquid A and an inlet 4c for liquid B are provided around the opening 4a. Further, a cooling jacket 5 is formed around the body casing 2, and one side of the cooling jacket 5 has an inlet 5a for a cooling medium (air, water, etc.), and the other side has an outlet 5b for the cooling medium. There is. Furthermore, a beak-shaped discharge pipe 3a extends downward in the center of the bottom casing 3, and a cooling jacket 6 is formed around the bottom casing 3 including the periphery of the discharge pipe 3a. Further, a cooling medium inlet 6a is provided on one side of the cooling jacket 6, and a cooling medium outlet 6b is provided on the other side.

A stirring rotor 7 is provided in the chamber 1a of the apparatus main body 1.
is arranged rotatably, and the rotor 7 is located in the opening 4.
It is supported by a rotating shaft 8 passing through a. A bearing ring member 8a is interposed in the gap between the rotating shaft 8 and the opening 4a,
The upper end of the bearing seal member 8a is pressed through a push metal fitting 8b that is urged downward by a spring 8c.

As shown in FIG. 2, the rotor 7 has a screw hole 7a in the center of its upper end into which the rotating shaft 8 is screwed, and the peripheral edge of the upper end surface is slightly inclined downward. A large number of protrusions 7b are protruded from the side peripheral surface of the rotor 7 at equal intervals in the circumferential direction and at regular intervals in the vertical direction.

The bottom of the rotor 7 is formed into a hemispherical shape corresponding to the shape of the bottom casing 3, and as shown in FIG. 3, a plurality of blades 9 are integrally formed in the shape of a windmill. The direction of the blade portion 9 is set so that the liquid material in the chamber /<-1a is sent to the discharge pipe 3a when the rotor 7 rotates forward.

A drill-shaped threaded rod 10 is provided at the center of the bottom of the rotor 7 to protrude downward and is inserted into the discharge pipe 3a. The direction of the threaded portion 10a of the threaded rod 10 is set so that the liquid in the discharge pipe 3a is discharged when the rotor 7 rotates forward.

Next, a specific usage example of the mixing/stirring device of the embodiment configured as described above will be explained.

In the process of manufacturing a polyurethane cleaning plate, a mixing and stirring device with a chamber internal capacity of 30 cc was used, and the rotation speed of the rotor 7 was 1500 rpm.

It was operated at a discharge rate of 90 g/l lin.

Liquid material A and liquid material B were used as liquid materials to be mixed and stirred in this apparatus. Liquid material A (urethane prepolymer) as a main ingredient was prepared by reacting a high molecular weight polyol (100 parts by weight) with a polyisocyanate (41 parts by weight) at a temperature of 70°C.

Liquid substance B as a curing agent contains 1,4-butanediol (5,9 weight f15) and trimethylolpropane (3,9 parts by weight), and 1,2 as a curing accelerating catalyst.
-dimethylimidazole (0.15 parts by weight) at a temperature of 10
The mixture was used at 0°C.

Then, the liquid A maintained at a temperature of 70° C. and a viscosity of 2000 centivoise was introduced into the chamber 1a through the inlet 4b, and the liquid B maintained at a temperature of 50° C. and a viscosity of 100 centivoise was introduced into the chamber 1a through the inlet 4c.

The ratio (weight ratio) of both is Liquid A Liquid B = 100
: It was set to 6.9.

In addition to preparing a large number of molds for cleaning blades,
Each mold was preheated to 145° C., and a liquid material mixed and stirred using a mixing and stirring device was intermittently discharged from the discharge pipe 3a into each mold.

The liquid material discharge time was 6 seconds, and the discharge stop time was 6 seconds. This results in approximately 20% of the urethane prepolymer in each mold.
It hardened in ~3 minutes and was able to be demolded.

By using the above-mentioned fast-curing resin liquid, a cleaning blade could be molded in a short time.

Moreover, the adhesion of the resin liquid to the inner wall of the chamber 18 and the inner wall of the discharge pipe 3a of this apparatus was much slower than that of the apparatus shown in FIG. 4, and the apparatus could be used continuously for 150 minutes.

That is, the resin liquid discharged from the discharge pipe 3a is 150
Both the mixing ratio and discharge amount were appropriate. In this way, the continuous usable time has been extended to 150 minutes, making it fully practical.

In addition, the above usage data indicates whether liquid A and liquid B were mixed using the complete prepolymer method, or both liquids were mixed using the pseudo prepolymer method at a ratio of approximately 1 liter and adjusted to a similar viscosity. It is clear that if a mixed resin solution is used, the continuous use time will be further extended.

By the way, the continuous usable time was determined by the following method. That is, liquid material A (main agent) and liquid material B (curing agent) in a supply tank (not shown) are pumped (
(not shown) to the chamber 1 from the inlets 4b and 4c.
However, at the start of operation, the pressure circulated to the supply tank via the pump and the pressure introduced into the chamber 1a from the respective introduction ports 4b and 4c are matched. Based on the pressure at that time and the performance data of the pump, the liquid A side is 2.0 kg/cm.
The determination was made assuming that the range until the liquid B side rose to 0.3 kg/am was considered to be the period of continuous use. As time passes after the start of operation, the introduction pressures of the liquid A side and the liquid B side gradually increase,
It took 150 minutes for the introduction pressure on the liquid material B side to exceed 0.3 kg/am' before the introduction pressure on the liquid material A side reached 2.0 kg/am'. This limit pressure varies depending on the viscosity of the liquid materials A and B used, the performance of the pump, the diameter of the piping, the discharge amount per unit time, etc., and is not a constant value. The mixing ratio of the injected resin liquid was inspected, and it was found to be within an appropriate (tolerable) range, and the molded product (resin product) also passed the standards.

In the above example, the case where a fast-curing polyurethane resin solution is mixed and stirred was explained as an example, but the resin liquid that can be used in the apparatus of the present invention is not limited to the example, and various resin liquids can be used. Can be used for mixing and stirring.

[Effects of the Invention] As is clear from the above explanation, the mixing and stirring device of the present invention has the following effects.

In other words, we have minimized the number of places in the chamber where the liquid material stagnates or accumulates, and also cooled not only the chamber but also the discharge pipe, especially when mixing and stirring fast-curing resin liquids. Also, the mixed liquid is prevented from hardening in a short time and adhering to the inner wall in the chamber or the discharge pipe, and the liquid can be mixed and stirred stably for a long time. Therefore, by using a fast-curing resin liquid, the production efficiency of resin products can be greatly improved, mass production becomes possible, and product costs can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a partially sectional front view showing a mixing and stirring device according to an embodiment of the present invention, FIG. 2 is a plan view of a rotor,
FIG. 3 is a bottom view of the rotor. FIG. 4 is a sectional view showing a mixing and stirring device previously developed by the applicant. DESCRIPTION OF SYMBOLS 1...Device body, 1a...Chamber, 2.Body casing, 3.Bottom casing, 38.Discharge pipe, 4.
・Lid, 4b, 4c...Inlet, 5.6...Cooling jacket, 7...Rotor, 7b...Protrusion, 8 Rotating shaft, 9...Blade part, 10...Screw Rod.

Claims (1)

[Claims] A stirring rotor is supported at the center of the upper end and is rotatable in the chamber of the main body of the device, which has a liquid material inlet at the upper end and a liquid material discharge pipe at the center of the lower end. A mixing/stirring device for agitating and discharging two or more types of liquid materials installed in a chamber, wherein the bottom of the chamber is inclined toward the inlet of the discharge pipe, and the bottom of the chamber is shaped to correspond to the shape of the bottom. A lower end of the rotor is formed, and a plurality of blades for transporting the liquid are provided on the lower end so as to be inclined in a direction in which the liquid is transported to the discharge pipe during forward rotation, and a side periphery of the rotor is provided. A threaded rod with many protrusions protruding from the surface and a threaded part engraved in the direction that discharges liquid during normal rotation.
A mixing and stirring device, characterized in that a cooling jacket is provided protruding from the center of the lower end of the rotor and inserted into the discharge pipe, and a cooling jacket is provided around the chamber of the device main body and the discharge pipe.