JPH0475067B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention prevents rainwater from entering into joints such as overlapping parts and joints of long board materials such as wood, metal, gypsum, and cement used in buildings and structures. The present invention relates to a sealant applicator used when applying a sealant to prevent.

Conventionally, construction methods have been adopted in which walls, etc. are constructed by joining together long boards in the width direction, such as cement-based materials made from hydraulic cement, asbestos, etc., as well as gypsum-based, metal-based, and wood-based materials. ing. At this time, the above-mentioned boards are joined by various combination methods such as tsuki, sotsu, and honjitsu provided on the longitudinal sides of these boards, and each joint is waterproof. , filled with an elastic sealant to absorb the effects of displacement.

When applying the above-mentioned sealant to a plate material, it is usually done in the following manner. For example, when applying a two-component polyurethane foam sealant, two raw material components are stored in two tanks 1 and 2 of a sealant applicator shown in FIG. It is introduced into the stirring container 3 through the introduction holes 7a and 7b at a predetermined flow rate. The introduced components are thoroughly mixed in the stirring container 3 by the stirring rotor 3a which is rotated at high speed by the rotating shaft 8 attached to the mixing head 7, and the liquid sealant 4 is mixed thoroughly.
This is continuously discharged from the nozzle 5 at the tip of the stirring container 3.

The discharged liquid sealing material 4 is applied to the real portion 6a of the plate material 6, for example, as shown in FIG. The same applies when the sealant is a normal one-component type, but especially when two reactive components are introduced into the stirring vessel 3 as in the case of a two-component polyurethane foam sealant, the sealant extruded from the nozzle The bead shape of the material deteriorates over time,
There was an inconvenience that beads with a desired shape could not be obtained.

As a result of various studies in order to solve the above problem, the inventors of the present invention found that there is almost no flow of the sealant on the inner peripheral surface of the nozzle hole, and as time passes, the sealant becomes semi-solidified, which intermittently peels off and flows out, forming a bead shape. I thought it would get worse.

The present invention has been made based on the above idea, and provides a sealant applicator in which the shape of the sealant bead does not deteriorate even when liquid sealant is discharged from a nozzle onto a plate material over a long period of time. The purpose is to

The sealant applicator of the present invention includes a stirring container with a built-in stirring rotor that introduces and stirs the pressure-fed sealant, and a stirring container that protrudes from the stirring container and is centered on the central axis of rotation of the stirring rotor. a nozzle having a protruding nozzle hole with a circular cross section whose axes coincide with each other, and a base integrally attached to the tip of the stirring rotating body, as close as possible to the inner peripheral surface of the nozzle hole, A means to solve the problem is to have a rotor formed with a rod-shaped portion that moves and rotates along the inner circumferential surface.

The present invention will be explained below with reference to the drawings.

3 and 4 show an embodiment of the sealant applicator according to the present invention, and reference numeral 11 in the figures indicates a stirring container. At the rear end of this stirring vessel 11 is a mixing head 7 that supports these.
installed on. The mixing head 7 is provided with introduction holes 7a and 7b that communicate the inside of the stirring container 11 with the outside. Further, a rotary drive shaft 13 is attached to the mixing head 7 and is rotatably held by a ball bearing 12. A stirring rotor 14 built into the stirring container 11 is fixed to the tip of the rotation drive shaft 13. This stirring rotor 14 is rotationally driven via a rotational drive mechanism (not shown).

A short nozzle 16 having a nozzle hole 15 having a circular cross section is bored at the tip of the stirring container 11, and the center of the nozzle hole 15 is aligned with the rotation axis 14a of the stirring rotor 14. It coincides with the axis 15a.

A base is integrally attached to the tip of the stirring rotor 14, and a rod-shaped portion 17 is formed that moves and rotates along the inner circumferential surface as close as possible to the inner circumferential surface of the nozzle hole 15. A crank-shaped rotor 18 is provided.

Next, the operation of the sealant applicator constructed as above will be explained.

The two raw material components of the sealant are introduced into the inlet hole 7a,
7b, mixed with the stirring rotor 14, discharged from the nozzle 16, and continuously applied the sealant to the plate surface for 16 hours while moving the plate or applicator, but the sealant did not build up. , beads with excellent shapes were consistently obtained.

Immediately after the application was completed, the sealant inside the nozzle hole 15 was inspected, but no signs of solidification were observed.

This is because the laminar bottom layer generated very close to the inner wall of the nozzle disappears due to the rotation of the rod-like part 17, collects in the center of the nozzle hole, and is pushed out by the pressure of the metering pump, so that half of the flow occurs over time. I think this is because all the sealing material is continuously discharged because there are no stagnant parts that solidify.

5 and 6 show other embodiments of the sealant applicator according to the present invention, in which the crank-shaped rotor 18 in FIG.
At the tip of the stirring rotor 14, a loop-shaped rotor 22 is attached, in which two rod-shaped parts 21 are formed, which are opposed in parallel to the central axis 15a of the nozzle hole 15 and are as close to the inner peripheral surface of the nozzle hole 15 as possible. It is something that

In this case as well, the rod-shaped portion 21 moves the sealing material close to the inner peripheral surface of the nozzle hole to the center of the nozzle hole that forms the cavity, and the sealing material is pushed out from the nozzle 16 by the introduction pressure of the metering pump. Therefore, no stagnation occurs.

The effects of the present invention will be specifically explained below with reference to Examples and Comparative Examples.

〔Example〕

When extruding a two-component polyurethane foam sealant, one raw material component is polyol, water: 0.5 part, metal catalyst 0.05 part, and amine catalyst:
Using 100 parts of polyol main component material mixed with 0.8 parts of propamine-based catalyst and 0.4 parts of propamine-based catalyst, and 25.3 parts of modified isocyanate as the other raw material component, each was continuously pumped using metering pumps 1a and 2a as shown in Figure 3. Then, the material is introduced into the stirring container 11 of the sealant applicator shown in FIG.
It was applied to a.

The length of the nozzle of the above applicator: 20 mm, the diameter of the nozzle hole: 6 mm, the rotation speed of the crank-shaped rotor 18: 600 rpm, and the distance between the rod-shaped part 17 and the inner peripheral surface of the nozzle hole 15: 0.1 mm. As a result, a bead of sealant with a desired shape of 3.5 mm in height and 7.0 mm in width was consistently obtained. Immediately after the 16-hour application process, the inside of the nozzle was inspected, but no signs of hardening of the sealant were observed.

Further, a loop-shaped rotor 22 was used instead of the crank-shaped rotor, and the sealing material was applied to the plate material under the same conditions. As a result, the bead had a width of 7.5 mm and a height of approximately 3.4 mm, a bead with a steady shape over a long period of time, and no signs of solidification within the nozzle hole were observed. Furthermore, the width of the bead became wider, probably because the center of the nozzle outlet was stirred by the loop-shaped rotor 22.

[Comparative example]

The sealing material was applied in the same manner as in the example except that a rotor applicator with the rod portion 17 of the crank-shaped rotor 18 of the example removed was used. As a result, signs of solidification were observed on the inner circumferential surface of the nozzle hole about 10 minutes after the start of coating, and after 15 minutes, semi-solidified urethane drooped at the nozzle tip, the shape of the bead deteriorated, and coating became impossible after about 20 minutes. .

As described above, the sealant applicator according to the present invention constantly moves the sealant near the inner peripheral surface of the nozzle hole to the center of the hole and extrudes it from the nozzle by the pressing force of the metering pump. Even if a large amount is added and the reaction proceeds in a stirring vessel or a nozzle, a quantitative bead of sealant can be obtained over a long period of time without solidification adhering to the inner circumferential surface of the nozzle. Ta. Intrusion of rainwater etc. through joints in buildings using this sealant was completely prevented.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing the flow of a sealant applicator used to apply a conventional two-component sealant, Fig. 2 is a side view showing the bead shape immediately after the sealant is applied onto a plate by discharging it from a nozzle, and Fig. 3 is a longitudinal sectional view of an applicator having a crank-shaped rotor, FIG. 4 is a view taken along the - line in FIG. 3, FIG. 5 is a view corresponding to FIG. 4 of an applicator having a loop-shaped rotor, and FIG. is − in Figure 5.
It is a line arrow view. 1, 2... Tank, 1a, 2a... Metering pump, 3... Stirring container, 3a... Stirring open body, 4...
...Sealing material, 5...Nozzle, 6...Plate material, 6
a... Real part, 7... Mixing head, 7a, 7
b... Introduction hole, 8... Rotating shaft, 11... Stirring container, 12... Ball bearing, 13... Rotation drive shaft, 14... Stirring rotor, 14a... Rotation center axis, 15... Nozzle hole , 15a... Central axis of nozzle hole, 16... Nozzle, 17... Rod-shaped part, 1
8... Crank-shaped rotor, 21... Rod-shaped part, 2
2...Loop-shaped rotor.

Claims (1)

[Claims] 1. A stirring container with a built-in stirring rotor that introduces and stirs the pressure-fed sealing material, and a stirring container with a circular cross section whose center axis coincides with the rotation center axis of the stirring rotor, which is protruded from the stirring container. A nozzle having a protruding nozzle hole, and a base integrally attached to the tip of the stirring rotor, move and rotate along the inner circumferential surface as close as possible to the inner circumferential surface of the nozzle hole. 1. A sealing material applicator comprising: a rotor having a rod-shaped portion formed therein;