JPH0523572A - Two-liquid container, two-liquid mixing method and its device - Google Patents

Abstract

PURPOSE:To mix an adhesive simply and efficiently by employing a technique by which to mix a prepolymer or a polymer having a reactive group which performs the same operation in a specified number of times using a difference between their specific gravities. CONSTITUTION:A two-liquid container consists of the first container with an extraction orifice where a prepolymer or a polymer having a reactive group is stored and the second container where a liquid crosslinking agent is stored, as an attachment to the former. The second container is rammed through by a bar with a pointed tip so that the prepolymer or polymer having a reactive group is allowed to come in contact with the crosslinking agent. In addition, the second container is maintained in an air-tight state with the bar and the two-liquid container is turned upside down. Further, the second container is left stationary as it is to allow the materials to be mixed by a difference in their respective specific gravity. After that, the two-liquid container is again turned upside down and the same operation is repeated. Thus an adhesive can be prepared easily without troublesome operation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for mixing a two-pack type thermosetting adhesive, particularly an aqueous emulsion adhesive. The method and apparatus of the present invention particularly relates to a control method for applying an adhesive in the form of droplets to spots on a printed wiring board.

[0002]

2. Description of the Related Art To mount a small electronic component on a printed circuit board, the electronic component is temporarily attached to a predetermined position on the printed circuit board with an adhesive, and then soldered by molten solder to fix the electronic component to the wiring conductor. It is widely practiced to make an electrical connection with. Various methods are performed to automatically perform this step, but basically, a large number of electronic components are temporarily mounted on a horizontally placed printed circuit board by an automatic mounting device, and then the printed circuit board is turned upside down (or (Not turned over), contacting the entire printed circuit board with molten solder. Therefore, the adhesive used for temporary attachment requires sufficient adhesive strength to prevent the electronic components from falling off or slipping even when the printed circuit board is inverted or heated, while it can correct the posture even if it shifts. Requires liquidity. or,
It is necessary to supply efficient adhesive. There are various factors as the requirements for this, but the main ones are that the tackiness of the adhesive is sufficiently high, that the adhesive can be supplied in a sufficient amount that can be adjusted at one time and with good reproducibility, Good cutting (no threading from the dispenser nozzle),
And so on.

Japanese Patent Application No. 2-1192, which is a prior application of the present applicant.
No. 5,2-234421 utilizes a thermoplastic or thermosetting acrylic modified emulsion adhesive. Such an adhesive can be dispensed accurately and efficiently by using a non-contact type adhesive dispenser (a system in which the nozzle tip does not contact the printed board) as shown in FIGS.

2 to 3, the supply tank 2 for the adhesive 11 is maintained at a predetermined constant pressure so that the droplet of the adhesive is ejected from the ejection nozzle 5 by opening the solenoid valve 4, and preferably the ejection nozzle 5 is used. In order to make the viscosity of the adhesive passing through it constant, the other parts are kept at a constant temperature. Adhesive 1
1 is led from the conduit 3 to the solenoid valve 4. By controlling the opening time in the solenoid valve 4, a fixed amount of adhesive measured is discharged from the injection nozzle 5. The tip of the injection nozzle 5 when not in use is always wet with water to prevent it from drying. The tip of the injection nozzle is preferably coated with a water-repellent material such as a fluororesin in order to improve liquid drainage. The adhesive enters the valve chamber 19 from the conduit 3 via the internal passage 17 of the housing 25. The upper end of the injection nozzle 5 is formed with an outlet valve seat 26, and the outlet 20 is normally closed because the valve body 20 is always biased downward by the compression spring 21. When the valve body 20 is pulled up by the electromagnetic coil 24, the valve body 20 enables the adhesive to flow to the injection nozzle 5, and the adhesive under pressure is dropletized and discharged from the injection nozzle 5. The valve body 20 is made of a soft magnetic material, and the magnetic core 22 is similarly provided above it.
Is screwed in and fixed by a nut 23. The electromagnetic coil 24 is powered by the lead 27. The power supply time is set to an arbitrary predetermined value by an adjuster (not shown), and the supply amount of one drop of the adhesive required to temporarily fix the electronic component is arbitrarily adjusted.

[0005]

According to the above dispenser, the amount of liquid per drop can be controlled more precisely than the conventional coating method in which the adhesive discharge port of the dispenser contacts the substrate after each coating. However, when using a thermosetting material that is particularly suitable as an adhesive, it is difficult to mix the prepolymer having a reactive group or the main agent consisting of the polymer with the liquid crosslinking agent and setting it in the dispenser. ,
Simple means and methods are required.

[0006]

According to the present invention, there is provided a first container having an extraction port and containing a prepolymer or a polymer having a reactive group, and a second container provided adjacent to the main container and containing a liquid crosslinking agent. A two-component container consisting of a container is provided. With this container, both liquids can be easily mixed and can be used as they are as an adhesive supply container for the above-mentioned dispenser, and after use, reliable and simple operation is possible.

The present invention also provides a mixing method using the above-mentioned container, wherein the second container is breached by the tip rod-like body to combine the prepolymer having a reactive group or the polymer and the crosslinking agent. Along with holding the sealed state with the rod-shaped body, the two-liquid container is turned upside down and left to stand for mixing due to the difference in specific gravity, and then turned upside down again to perform the same operation. This is a method for mixing a prepolymer or polymer having a reactive group with a cross-linking agent, which is characterized by performing various operations. This method enables easy and reliable mixing of two liquids using a simple device.

The present invention also provides an apparatus for mixing the two liquids in the above-mentioned two-liquid container, which has a tip for breaking through the outer wall of the second container in contact with the outside air and the inner wall of the second container side. A rod-shaped body, and a power drive means for moving the rod-shaped body forward,
The rod-shaped body includes a support reversing unit that supports and inverts the first container, and has a groove near the tip of the rod-shaped body that allows the cross-linking agent to flow into the first container when the second container is breached. It is a mixing device of a prepolymer having a reactive group or a polymer and a crosslinking agent.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 illustrates a two-liquid mixing container and a mixing device according to an embodiment of the present invention. The mixing method of the present invention will be described with reference to this figure. The two-liquid mixing container is used as the adhesive supply container of the dispenser shown in FIGS. Therefore, this container can be easily set in and removed from the device as a disposable container. First, the two-liquid mixing container will be described. In FIG. 1, a two-liquid container 30 includes a first container 36 having an extraction port 32 and containing a prepolymer or a polymer (main ingredient) 34 having a reactive group, and It comprises a second container 38 which is removably and hermetically fitted in the open end 40 of the main container and which contains a liquid cross-linking agent 48. A cap 42 is fixed to the tip of the extraction port. The cap 42 is removed prior to use and then attached at a predetermined position in FIG. 2 or the cap 42 is formed by an extraction tube such as an injection needle. Any means such as piercing and communicating with the device-side conduit can be used. The second container 38 includes an outer wall 44 and a first wall 44 that are in contact with the outside air
A cross-linking agent 48 is contained between the inner wall 46 facing the chamber of the container and the inner wall 46. The first and second containers 36, 38 have a flange 50,
It is sealed by 52 and can be separated from each other by suitable separating means (not shown). Inner and outer walls 46, 44
Is manufactured from a material, such as aluminum foil, which can be easily pierced by the rod-shaped body 54 described below.

Next, an example of the mixing apparatus of the present invention will be described.
In FIG. 1, 56 is an annular lower-end support that supports the lower end of the two-liquid container 30, 58 is an annular middle-portion support that supports the middle, and 60 is an annular upper-end support that holds down the upper end. The opening of the upper end support body 60 is sized to allow the rod-shaped body 54 to pass therethrough. The supports 56 and 58 are integrally supported by a pivot (not shown) and can be turned upside down by a rotating means (not shown). Further, the support body 60 can be attached to and detached from the support bodies 56 and 58. Reference numeral 62 denotes a hydraulic device (which may be an electric device), which is composed of a cylinder and a piston that supports the rod-shaped body 54, and advances or retracts the rod-shaped body 54 by supplying liquid to the cylinder. The lower end of the rod-shaped body 54 is a pointed end, and has several vertical grooves 64 around which the adhesive is released.

Next, the mixing method of the present invention will be described with reference to FIG. First, the two-component container 30 of (a) is inserted into the annular portions of the supports 56 and 58 with the extraction port facing down as shown in (b), and then held by the support 60. Next, by activating the hydraulic device 62,
The tips of the rods 54 pierce the walls 44, 46 of the second container and then the rods are advanced to (c). This causes the curing agent to flow down into the main agent. If the adhesive is left as it is, the adhesive will be mixed into the main resin due to the difference in specific gravity from the main resin. When the curing agent reaches the vicinity of the extraction port, the supports 56, 58 and 60 are rotated as shown by the arrows to invert the two-liquid container and make it stand at the position (d). When the same reverse stationary is continued several times, a predetermined mixing is achieved. If the reversal is made too fast, the mixing will be slowed down. If the rotation is too slow, the dead time increases, so an appropriate rest time is set.

[0012]

As described above, according to the present invention, when a thermosetting material is used, a prepolymer having a reactive group or a main agent made of a polymer is mixed with a liquid crosslinking agent and set in a dispenser. The work is significantly easier.

[Brief description of drawings]

FIG. 1 is a diagram showing a two-liquid container and a two-liquid mixing device of the present invention, where (a), (b), (c), (d), and (e) show sequential steps of mixing in this order. .

FIG. 2 is an overall view of an adhesive dispenser.

3 is a cross-sectional view showing details of a solenoid valve of the adhesive dispenser of FIG.

[Explanation of symbols]

30 2 Liquid Container 32 Extraction Port 34 Prepolymer or Polymer (Main Agent) Having Reactive Group 36 1st Container 40 Open End 48 Liquid Crosslinking Agent 38 2nd Container 42 Cap 44 Outer Wall 46 Inner Wall 50, 52 Flange 54 Rod 56 , 58, 60 Support 62 Hydraulic device 64 Vertical groove

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI Technical display part // B05C 5/00 Z 9045-4D

Claims (3)

[Claims] 1. A two-liquid container comprising a first container having an extraction port and containing a prepolymer or a polymer having a reactive group, and a second container provided in a line with the main container and containing a liquid crosslinking agent. By breaking through the second container with a tip rod-shaped body, the prepolymer or polymer having a reactive group and the cross-linking agent are combined and the sealed state is maintained by the rod-shaped body, and the two liquid container is turned upside down. After that, the mixture is allowed to stand to perform mixing due to the difference in specific gravity, and then the same operation is performed again by turning it upside down again, and the same operation is performed a predetermined number of times. Method of mixing cross-linking agent. 2. A first container having an extraction port and containing a prepolymer having a reactive group or containing a polymer, and a liquid cross-linking agent which is removably and hermetically fitted to the open end of the main container. In a device for mixing two liquids of a two-liquid container formed of a second container, a rod-shaped body having a tip for breaking through an outer wall of the second container in contact with the outside air and an inner wall on the second container side,
A power driving unit for advancing the rod-shaped body, and a support reversing unit for supporting and reversing the first container. The vicinity of the tip of the rod-shaped body is the first container of the cross-linking agent when the second container is breached. A device for mixing a prepolymer or a polymer having a reactive group and a cross-linking agent, which has a groove that enables the flow to the polymer. 3. A first container having an extraction port and containing a prepolymer or polymer having a reactive group, and a liquid crosslinking agent which is removably and hermetically fitted to the open end of the main container. A two-liquid container consisting of a second container.