JPS61261005A - Mixing device for two liquids reactive raw material - Google Patents

Abstract

PURPOSE:To obtain the small quantity of uniformly mixed reactive mixture with less tendency of bubble inclusion by providing one emitting mouth at the position where one liquid may be emitted to a first groove from the outer cylinder of a rotary axis with two or more grooves, and the other emitting mouth connected to the position where the residual liquid may be emitted to the other line groove, without contacting with the liquid in the first line groove. CONSTITUTION:The device is composed large of the rotary axis 1 with two grooves 3, 4 and the outer cylinder 2 closely engaged therewith. The emitting mouth 7 through which a reactive raw material A flows in, and another emitting mouth 8 through which a reactive raw material B flows in, are respectively connected to the groove 4 by connecting grooves 11 and 10 upon their injection mixing. The rotary axis is cut such that its outer diameter becomes small at its tip 5, thereby forming the gap 6 providing a mixing part between the outer cylinder and the rotary axis. The liquids A and B are sent under pressure and then mixed and agitated in the gap of its tip, while giving shear action to the liquid in between the rotary axis and the outer cylinder. Because said liquid is continuously injected, the injection of high accuracy may be achieved with less tendency of bubble inclusion.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a mixing device for two-liquid reaction raw materials used in reactive injection molding machines, casting machines, two-liquid adhesives, and the like.

BACKGROUND OF THE INVENTION In the present invention, conventional equipment used for vacuum casting, botting, etc. uses a mixing method and equipment such as a static mixer or power mixing using forced stirring, but cleaning with a cleaning liquid such as a solvent is essential. Therefore, there were problems such as a cleaning process that caused a lot of material loss and mixing of the solvent into the molding material, which caused variations in the physical properties of the molded product, which prevented productivity from increasing. In addition, in the field of reactive injection molding of urethane, nylon, etc., various collision mixing methods and devices are used, but since there is a collision part, air bubbles are easily drawn in, and high pressure is required, so a hydraulic mechanism is required. Although it is suitable for large-scale equipment such as, it is insufficient as a small-sized production equipment with a relatively large capacity.

Problems to be Solved by the Invention The problems to be solved by the present invention are a mixing method that does not require a cleaning liquid and an apparatus therefor, a mixing method that does not easily contain air bubbles, and can obtain a minute amount of a uniformly mixed reaction mixture. and its equipment. In addition, the method for mixing two-component reaction raw materials and the apparatus using the same can also be used as an optimal dispenser for materials such as two-component epoxy instant adhesives.

Means to Solve the Problem In a method for mixing two-component reaction materials, a discharge port is provided at a position where one of the liquids can be discharged from the outer cylinder of the rotating shaft having two or more grooves into the first groove, and the remaining A discharge port is provided at a position where the liquid can be discharged into the grooves of the other grooves so that it conducts without coming into contact with the liquid in the first line.Each liquid raw material is fed with the rotation of the rotating shaft, and the groove disappears at the tip and the outlet is connected to the outside. This is a mixing method of two-component reaction materials that are stirred and mixed in a narrow gap between the cylinder and the rotating shaft.By doing this, a small amount of the two components are mixed on the rotating surface and only harden in the thin film part, making it possible to form the groove shape. By making the shape similar to a drill blade, the cured product has the characteristic that it can be continuously discharged while being scraped off.

The two grooves may be replaced with three grooves, and by providing an unused groove in the middle, it is possible to form a cured product and make it difficult for the two liquids to mix. The device has a tank for a two-liquid reaction raw material, a mechanism for pumping it, a groove path on a rotating shaft connected to two grooves, and a rotating shaft with two grooves and a motor for rotating it. The rotating shaft has at least one continuous horizontal gap in the vertical section between it and the outer cylinder in the region of the distal end discharge part.
This is a two-liquid reaction raw material mixing device characterized by having a structure having at least two parts, whereby the two liquids are mixed due to the difference in shear rate between the inner cylinder and the outer cylinder. More preferably, the rotary shaft has a mechanism in which a rotating shaft having two or more grooves moves in the axial direction.

However, in reactive injection molding and casting,
By devising the mold nozzle touch structure, continuous production without cleaning is possible. Also, the mechanism for pressure-feeding the reaction materials is a piston-cylinder.

Preferably, the mechanism is one selected from a lance cylinder, a bellows pump, and a gear pump, or a combination of these. It is preferable that there be. In addition, it is preferable that these mixing apparatuses are subjected to temperature control such as heating a part of the apparatus, each tank path, or the whole apparatus, or cooling the mixing part, depending on the application. A more detailed explanation will be given below based on examples.

Embodiment FIG. 1 is an embodiment of a mixing nozzle showing the mixing method of the present invention. It is largely composed of a rotating shaft 1 having two grooves 3.4 and an outer cylinder 2 in close contact with the rotary shaft 1, and has a discharge lower into which one of the reaction raw materials (hereinafter referred to as liquid A) flows and the other reaction raw material (hereinafter referred to as liquid B). The discharge port 8 into which liquid (abbreviated as "liquid") flows is connected to the groove 4 by a connecting groove 11 and a connecting groove 1o, respectively, during injection mixing. In addition, the rotating shaft is cut to have a smaller outer diameter at the tip 6, and a gap 6 is formed between it and the outer cylinder to serve as a mixing section, and liquids A and B are pumped to the mixing section. Then, shear is applied between the rotating shaft and the outer cylinder, and the mixture is mixed and stirred in the gap at the tip. Further, a backing 14 is formed between the A liquid and B liquid discharge ports, and a backing 13 is formed above the B liquid discharge port. Further, a guide groove 12 is formed inside the rotating shaft so that the path of the B liquid does not come into contact with the A liquid. The shape of the double groove should preferably imitate the shape of a drill bit, so it was made into a predetermined rectangular shape 16. By doing so, the two-liquid reaction raw materials could be mixed without being hardened in the groove.

Note that the rotating shaft is connected to a rotating motor at its tip 9.

FIG. 2 is a procedure diagram showing a simple method for manufacturing a rotating shaft. After considering a predetermined discharge liquid volume range, an appropriate cutting drill 16 is selected and used to machine the inner wall of the outer cylinder that is to become the outer cylinder. After that, the upper part 17 of the drill is machined to form the shape 18 shown in b.Then, a semi-cylindrical cylinder having a groove 26 in the center, which has been machined in advance, as shown in Fig.
Join to the processed part shown in the figure. At that time, there is a gap 20.2 at the top and bottom.
1 will be equally secured. The second half of the cylinder 25 is processed to have a uniform outer circumference to form a shape 19 having a uniform circumference.

Thereafter, connecting grooves 23 and 24 connected to each discharge port are cut to obtain the rotating shaft 22 shown in Figure e. In addition, when the viscosity of the reaction raw material is low, it is preferable to also process the backing groove shown in FIG. 1.

FIG. 3 shows a front view a and a plan view of an embodiment of a fast-curing two-component epoxy dispenser.

The mixing section 26 of the present invention shown in FIG. 1 and FIG.
and a gear pump 29 for liquid B and a discharge port of a variable DC motor 34. In addition, the mixing part is o℃~5°CK''±
It can be cooled at 1°C using the cooling temperature control unit. Connected to a circulator. Furthermore, the rotation axis is air 28 at the top.
is connected to an actuated cylinder 32 and connected thereto to a DC motor 33. Also, a constant pressure is applied to the A liquid tank and B liquid tank, and the gear pump suction port 3
It is connected to 5.36. By doing this, the fast-curing two-component epoxy (Rapid, manufactured by Araldite) could be stably used continuously for 8 hours, and by wiping off only the mixing part after use, continuous use became possible.

FIG. 4 shows an example in which the mixing method of the present invention is applied to a reactive injection molding machine. A liquid tank 37° B liquid tank 38
is a pressure pump, this time it is a lance cylinder pump 39.4
0, and at times other than injection, the three-way valves 50 and 51 are closed, the pipes 43 and 45 degrees are turned, and the valves 50 and 51 are opened to perform mixing and injection. By using this method, cross-linked polyester amide TK-222 (manufactured by Shikinichi Yakuhin) could be used for stable production of small-volume parts.

In this case, the temperature of all paths was controlled 49 at 130°C to 150'C.

Effects of the Invention As described above, the present invention provides a mixing method and apparatus suitable for reactive injection molding of a walking capacity, an adhesive dispenser, and the like. This has made it possible to create molded products or adhesives with stable physical properties without the need for cleaning fluids. In addition, since the injection is performed continuously, it is difficult for air bubbles to enter, making it possible to perform highly accurate injection.

Furthermore, the present invention has high industrial value in that it was able to provide a compact mixing device that does not require special high pressure or hydraulic pressure.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a mixing nozzle showing a mixing device according to an embodiment of the present invention, Fig. 2 is an explanatory diagram showing each step of the method for manufacturing a rotating shaft of the same mixing device, and Fig. 3a is a quick curing 2 A front view of the liquid epoxy dispenser, FIG. 3 is a plan view thereof, and FIG. 4 is a process diagram when the present invention is applied to a reactive injection molding machine. 1...Rotating shaft, 2...Outer cylinder, 3, 4...
...2 grooves, 7, 8...discharge port, 6.
...Gap, 26...Mixing section, 27...
... Temperature control section, 29, 30 ... Gear pump, 32 ... Cylinder, 41 ... Medium temperature mixing section,
37.38 Old... Raw material tank, 39, 4o Kawakawa Lance cylinder, 43.44, 47.48... Circulation pipe. Name of agent: Patent attorney Toshio Nakao and 1 other person
1 Figure/-@Tenkin 2--ri [Portrait 7, δ-D Ueda] Figure 2" b <, ch (e)
0,) 33
32--Cylinder No. 4: J7.3B---, /: Te, Kigyu Gunguguq, 40-
--Komata Nkunda ゛4f--Massei 11th Reiya

Claims (4)

[Claims] (1) In a two-component reaction raw material mixing device, a discharge port is provided at a position where one of the liquids can be discharged from the outer cylinder of the rotating shaft having two or more grooves into the first groove, and the remaining liquid is transferred to the second groove. A discharge port that conducts without contacting the first liquid is provided at a position where it can be discharged into the groove, and each liquid raw material is fed as the rotating shaft rotates.The groove disappears at the tip, and the narrow line between the outer cylinder and the rotating shaft A mixing device for two-liquid reaction raw materials that are agitated and mixed by shearing the air gap. (2) A two-liquid reaction raw material tank and a mechanism for pumping it, and 2
a rotary shaft having a path connected to a groove in the groove, and a rotation shaft having two grooves;
A mixing device for a two-liquid reaction raw material, comprising a motor for rotating this rotary shaft, and the rotary shaft has at least one continuous gap in a vertical cross section between the rotary shaft and the outer cylinder in the region of the distal end discharge portion. (3) The mixing device for two-liquid reaction raw materials according to claim 2, which has a mechanism in which a rotating shaft having two or more grooves moves in the axial direction. (4) The mixing device for two-liquid reaction raw materials according to claim 2, wherein the pressure-feeding mechanism is a mechanism using one or a combination of a piston cylinder, a lance cylinder, a bellows pump, and a gear pump.