JPH076155Y2 - Spray can for spraying one-part moisture-curable coating - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spray can for spraying and applying a one-component moisture-curing type coating composition and capable of storing it for a long period of time.

[0002]

2. Description of the Related Art Recently, an aerosol type spray can using a liquefied gas such as liquefied propane gas or dimethyl ether as a propellant has been widely used.

In such a spray can, conventionally, as shown in FIG. 4, for example, a push button b having an injection port a is attached to an upper end of a stem c of a valve mechanism provided in the main body of the can. Further, this valve mechanism is constructed such that the side hole e of the stem closed by the stem rubber d is opened by pushing down the push button b, so that the injection port a of the push button b is electrically connected to the inside of the can body.

On the other hand, in the construction of a house, for example, the joints formed between the exterior plates are exposed to moisture in the air such as urethane prepolymer in order to facilitate the adhesion and improve the durability prior to the filling of the caulking agent. A one-part moisture-curing type coating agent that reacts and cures is applied as a primer. Also sometimes as a caulking agent,
Such a one-part moisture curing type coating agent is used.

[0005]

It is conceivable to fill, spray, and apply such a one-component moisture-curable coating agent into a spray can having a push button b shown in FIG. 4, for example. When filled with a one-part moisture-curable coating,
By long-term storage, the one-component moisture-curing type coating agent inside reacts due to moisture in the air entering between the stem c and the stem rubber d, and further from the injection port a through the side hole e, With the passage of time, a precipitate is formed with the curing of the coating material,
It has been found that in addition to making the operation of the stem c unsmooth, the coating material discharge path of the valve mechanism is clogged, and defective injection is likely to occur.

Even when a conventional spray can having a push button is filled with such a one-part moisture-curing type coating agent, the spray failure does not occur in all the spray cans, but the proportion is small. Even if it is, a spray can that causes injection failure is not a commercial product, and it is very costly to prevent injection failure by modifying the valve mechanism itself and suppressing the variation in quality during spray can manufacturing. Required and cannot be put to practical use.

Therefore, conventionally, the application of the one-component moisture-curable coating agent has been unavoidably applied by brush coating, which requires several times the number of steps as compared with the spray coating using a spray can.

The present invention is based on the fact that a threaded portion is provided on the raised portion of the can body and a cap surrounding the stem with a small gap is screwed onto this threaded portion. An object of the present invention is to provide a spray can capable of smoothly spraying a water-moisture-curing type coating agent and spraying a one-pack type moisture-curing type coating agent that can solve the above problems.

[0009]

SUMMARY OF THE INVENTION The present invention comprises a can body in which a valve mechanism is fixed to a can body filled with a one-component moisture-curable coating agent and a propellant, and a cap attached to the can body. A spray can for spraying a one-component moisture-curing type coating agent, wherein the can body has a valve box having a valve hole leading to the can bottom, and a bottomed hole having an upper opening. Inside the raised portion provided with the valve mechanism, which is housed by being biased upward in the valve hole, and further includes a stem that connects the bottomed hole and the valve hole by pushing down, at the center of the mountain cup at the upper part of the can body. The stem is inserted into the through hole provided at the center of the raised portion while leaving the receiving surface around the upper surface of the raised portion, and the upper portion of the stem is projected from the upper surface to be fixed, and the outer peripheral surface of the raised portion is fixed. On the other hand, the cap is formed on the raised portion by being screwed onto the screw portion. An inner hole that is attached and surrounds the upper part of the stem with a small gap by attachment, and a pressing surface that is provided at the lower end of the inner hole and abuts the receiving surface via a seal to seal the inner hole. A spray can for spraying a one-part moisture-curing type coating agent having:

[0010]

In the can main body filled with the one-component moisture-curable coating material, only the upper portion of the stem of the valve mechanism is projected from the raised portion. Further, the cap has an inner hole that surrounds the stem with a small gap, and is screwed to the ridge, and the pressing surface of the cap closes the ridge with a seal. Therefore, the stem is sealed in the small space formed by the inner hole.

As a result, since the amount of air in the space is small, the amount of moisture contained therein is also small, and the one-component moisture-curable coating agent inside the can body hardly reacts with moisture. Prevents the generation of precipitates due to successive hardening, and prevents ejection failure for a long time. Therefore, by removing the cap at the time of use, it can be used as it is even after storage for a long period of time, and the one-component moisture-curable coating agent can be applied by spraying with a spray can, and the work efficiency can be improved.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1 to 3, a spray can (hereinafter referred to as a spray can) for spraying a one-part moisture curing type coating material of the present invention 1
Is composed of a can body 3 in which a valve mechanism 5 is fixedly attached to a can body 2 filled with a one-component moisture-curable coating agent and a propellant, and a cap 4. An outer cap 6 that covers the cap 4 is attached.

The one-component moisture-curing type coating agent comprises a mixture of urethane prepolymer, silane coupling agent, solvent and the like, and liquefied gas such as liquefied propane gas and dimethyl ether can be used as a propellant. The can body 2
Is provided with a mountain cup 23 on the upper part of a bottomed base cylinder 21 via a cone-shaped joint cylinder 22, and these are connected by, for example, curl connection with an appropriate seal interposed.

The mountain cup 23 has a cylindrical hanging portion 25 extending downward from the connecting portion with the joint cylinder 22, and an outer cylindrical portion 27 and its outer cylindrical portion 27 via a horizontal portion 26 at the lower end of the hanging portion 25. A ridge 30 having a horizontal upper piece 29 at the upper end
Is provided in the center of the mountain cup 23. Further, a through hole 32 is formed in the center of the upper piece 29 leaving a receiving surface 31 formed by the upper surface of the upper piece 29, and a small height standing wall portion 33 is formed around the through hole 32. ing.

A screw portion 34 is formed on the outer peripheral surface of the outer cylinder portion 27 by spirally recessing the outer cylinder portion 27, and the raised portion 30 accommodates the valve mechanism 5. .

The valve mechanism 5 includes a valve box 3 having a valve hole 35.
6 and a stem 37 housed in the valve hole 35. A stem rubber 39 is arranged between the upper end of the valve box 36 and the upper piece 29, while the stem 37 is turned upward by a spring 40. I am biased.

The valve box 36 has a small-diameter portion at the lower end of the base portion 41 provided with the valve hole 35 and having a hole portion for connecting the valve hole 35 to the can bottom by connecting to the hose 42 extending to the can bottom. 43 is provided.

On the inner peripheral surface of the valve hole 35, a guide portion 45 extending from a position slightly separated from the upper end to the vicinity of the lower end and bulging inward is provided, and the spring 40 is provided at the lower end thereof. The receiving spring support surface 47 is formed via the cone surface.

Further, on the inner peripheral surface of the valve hole 35, the guide portion 45 is cut out to form a plurality of split grooves 49 extending downward beyond the spring support surface 47.

On the other hand, the stem 37 has the guide portion 45.
An upper portion 53 having a small diameter extending upward through a circumferential groove 52 is provided at the upper end of the guide portion 51 guided and slid on the inner peripheral surface of the. A spring support surface 54 for receiving the upper end of the spring 40 is provided at the lower end of the guide portion 51.

Further, the stem 37 has an upper open bottomed hole 5 extending from the upper end thereof to the inside of the guide portion 51 beyond the upper portion 53.
5, the bottomed hole 55 is provided with one or a plurality of small-diameter side holes 56 communicating with the inner surface of the circumferential groove 52.

Since the upper portion 53 is inserted through the through hole 32 of the mountain cup 23 and is also guided by the standing wall portion 33, the stem 37 can be moved vertically while being urged upward by the spring 40.

Further, the stem rubber 3 is provided in the circumferential groove 52.
9 is fitted and the side hole 56 is normally closed by the stem rubber 39.

The upper portion 53 of the stem 37 is pushed downward, and the side rubber 56 is opened by bending and deforming the stem rubber 39 downward. In this way, by pushing down the stem 37, the bottomed hole 55 and the valve hole 35 are made to communicate with each other through the side hole 56. Therefore, the bottomed hole 55 is
The side hole 56, the split groove 49 of the valve hole 35, the hole of the small diameter portion 43, and the hose 42 can be communicated with the bottom of the can.

In the valve mechanism 5, the stem rubber 39 is interposed between the valve mechanism 36 and the upper piece 29, the valve box 36 is inserted into the raised portion 30, and the raised portion 30 is formed when the screw portion 34 is formed. The valve mechanism 5 is fixed by pinching the valve box 36 by the deformation of 1. and the upper portion 53 of the stem 37 projects upward due to this fixing.

The cap 4 includes an inner hole 59 that surrounds the upper portion 53 of the stem 37 with a small gap g, and a seal 6 provided at the lower end of the inner hole 59 and using rubber or the like on the receiving surface 31.
The pressing surface 61 is in contact with the pressing surface 61 via an inner peripheral surface of the mountain cup 0, and the inner threaded portion 62 is continuous with the outer peripheral edge of the pressing surface 61 and is screwed into the threaded portion 34 of the mountain cup 23. Therefore, the inner screw portion 6
By screwing 2 into the screw portion 34, the pressing surface 61
Presses the receiving surface 31 via the seal 60, and the upper portion 5
The inner hole 59 that forms a space surrounding 3 is kept airtight.

Further, the cap 4 is provided with an engaging portion composed of notches 65, 65, which are absent on both sides of the upper portion,
The cap 4 can be screwed and unscrewed by gripping the locking portion. Various things such as a knurled one can be used as the engaging portion. The outer cap 6 is fitted to the connecting portion between the joint cylinder 22 and the mountain cup 23.

The spray can 1 is stored with the cap 4 and the outer cap 6 attached. Also, when using, the outer cap 6 and cap 4 are removed. After that, the nozzle fitting 70 is attached. This nozzle fitting 70
Can be easily attached to and removed from the peripheral surface and the lower surface of the can main body 2, the packaging box, the cap 6 outside, and the like at appropriate places.

The nozzle fitting 70 has a push button-shaped main portion 71 fitted to the upper portion 53 of the stem 37, and a nozzle 73 provided through a small-diameter conduit 72 extending laterally. Is, for example, two injection ports 74, 74 on the opposite side.
Is formed.

Therefore, by pushing up the main portion 71, the valve hole 35 and the bottomed hole 55 are brought into conduction as described above, and the one-component moisture-curable coating agent is applied to the two injection ports 74, 7.
4, the one-part moisture-curing type coating agent can be simultaneously applied to both surfaces sandwiching the joint.

The inventors of the present invention have shown that the effectiveness of the cap 4 is obtained by placing the spray can with the cap 4 and the conventional spray can of FIG. 4 in a constant temperature and humidity chamber at a temperature of 20 ° C. and a humidity of 65%. Experiments were carried out by storing 30 of each and taking out 10 of them every 3 months for a spray test. With the spray can equipped with the cap 4, a good injection was immediately obtained even after the lapse of 9 months, while in the case of FIG. 4, 1 can at the 3rd month, 3 cans at the 6th month, At the 9th month, spray failure of 3 cans occurred. From this result, it is clear that the spray can of the present invention having the cap 4 is more effective against the ejection failure than the conventional one in FIG.

In the present invention, the inner hole 59 that surrounds the upper portion 53 of the stem 37 with a small gap g allows the stem 4 to be screwed even when the screwing means has a variation in accuracy. It is preferable that the diameter is such that it does not collide with 37, thereby reducing the amount of air in the space formed by the inner hole 59,
It reduces internal moisture and effectively prevents the curing of one-part moisture curing type coating agents. In addition, a small gap g of about 1 mm or more, preferably about 0.5 mm or more, is usually provided between the outer peripheral surface of the upper portion 53 of the stem 37 and the inner peripheral surface of the inner hole 59.
It is better to set them so that they are separated from each other. In addition, in order to reduce the amount of air, it is at most 5 mm or less, preferably 3 mm or less.

Further, in the spray can of the present invention, for example, the valve mechanism 5 can be formed by using another known one.

[0034]

As described above, in the spray can of the present invention, since the cap has a small amount of air in the inner hole that surrounds the stem with a small gap, the moisture contained therein is small, By preventing the reaction of the one-component moisture-curing type coating agent inside the can body with moisture, and preventing the ejection failure for a long period of time, it can be stored for a long period of time. The coating material can be applied by spraying with a spray can, and the work efficiency can be improved.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view showing a main part thereof.

FIG. 3 is a cross-sectional view showing a usage state.

FIG. 4 is a cross-sectional view illustrating a conventional spray can.

[Explanation of symbols]

 2 can main body 3 can body 4 cap 5 valve mechanism 23 mountain cup 29 upper piece 30 raised part 31 receiving surface 32 through hole 34 screw part 35 valve hole 36 valve box 37 stem 39 stem rubber 53 upper part 56 side hole 59 inner hole 60 seal 61 push piece

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Ryohide Fujimoto 1-4-7 Nakasu, Ishizu-cho, Hamadera, Sakai-shi, Osaka Sunrise Meisei Co., Ltd.

Claims (1)

[Scope of utility model registration request] 1. A one-component moisture-curable type comprising a can body in which a valve mechanism is fixed to a can body filled with a one-component moisture-curable coating agent and a propellant, and a cap attached to the can body. A spray can for spraying a coating material, wherein the can body has a valve box having a valve hole communicating with the bottom of the can at the top, a bottomed hole having an upper opening, and being biased upward by the valve hole. The valve mechanism including a stem that connects the bottomed hole and the valve hole by pushing down the valve mechanism inside the raised portion provided in the center of the mountain cup at the upper portion of the can body, around the upper surface of the raised portion. The stem is inserted through a through hole provided in the center of the receiving surface, and the upper portion of the stem is protruded from the upper surface to be fixed, and a screw portion is formed on the outer peripheral surface of the raised portion, The cap can be attached to the ridge by screwing it onto the threaded portion An inner hole that surrounds the upper part of the stem with a small gap, and a pressing surface that is provided at the lower end of the inner stem and that makes the inner hole airtight by pressing the receiving surface via a seal. A spray can for spraying a one-part moisture curing type coating agent.