JP6891026B2 - Two-component mixed spray container - Google Patents

Description

An embodiment of the present invention relates to a two-component mixed spray container in which two liquids to be mixed at the time of use are sealed in a state of being separated from each other.

It is known that by applying polyurea as a lining material to various facilities such as concrete structures and metal tanks, excellent effects are exhibited in anticorrosion / waterproofing, life extension / reinforcement of structures, and the like. Currently, in order to paint polyurea, spraying by a large-scale dedicated device, which is difficult to handle by one person, is used (see, for example, Patent Document 1).

Touch-up is required when the paint film is scratched. When the touch-up is hand-painted with a brush, the polyurea compositions A and B must be mixed at the construction site each time. The burden on the operator is heavier than when spraying touch-up. Furthermore, in the case of hand-painting, the finish is greatly affected by the skill of the operator, so there is a risk of dripping and spoiling the aesthetic appearance. However, it is also difficult to repaint using a large dedicated device. Therefore, a spray can type touch-up with excellent handling is desired.

Japanese Unexamined Patent Publication No. 8-238453 Japanese Patent No. 4947792

Polyurea has various features not found in other lining materials, but it is difficult to handle. Although containers for spraying two-component materials are known, they have not been structured to be applicable to polyurea compositions. For example, polyurea cures quickly, and when agent B is added to agent A, the viscosity increases rapidly. It is difficult to sufficiently mix Agent A and Agent B only by shaking the spray can. In addition, the polyurea composition is sensitive to water, and depending on the amount of water mixed in, the period during which the spray can can be stored is significantly shortened. Disposable spray cans are manufactured in a well-ventilated environment to avoid the risk of explosion, and the amount of water adsorbed on the spray cans varies greatly depending on the season and weather.
An object of the present invention is to provide a two-component mixed spray container that can protect the contents from moisture and reduce the burden of stirring and the like of an operator.

The two-component mixed spray container of one embodiment according to the present invention is a spray container containing a two-component composition to be mixed at the time of use. The spray can 1 includes a first container, a second container having an internal pressure lower than the internal pressure of the first container, a valve, a tube, an opening means, a static mixer, a powdery desiccant, a nozzle, and the like. It has. The first container contains a first content containing an isocyanate-based agent A and a propellant. The second container is housed in the first container. The second container contains a second content containing a B agent containing a polyamine as a main component. The valve is provided in the opening of the first container. The tube is housed in the first container. One end of the tube is connected to the valve. The other end of the tube is submerged in the first content. The opening means opens the second container. The static mixer is built into the tube. The powdery desiccant is contained in the liquid phase portion of the first content. The nozzle is mounted on the valve. When the second container is opened by the opening means and the valve is opened, the pressure of the propellant causes a mixture of the A and B agents to flow into the tube, the mixture is agitated by the static mixer, and polyurea is ejected from the nozzle. To.

In the two-component mixed spray container of one embodiment, the container has an integrated structure, which is excellent in handling and can reduce the burden on the operator. It has good resistance to humidity, can be manufactured as a spray container regardless of the season and weather, and can be stored for a long period of time.

FIG. 1 is a cross-sectional view showing the inside of a spray can. FIG. 2 is a cross-sectional view showing the inside of the valve shown in FIG.

The two-component mixed spray container of one embodiment will be described with reference to FIGS. 1 and 2. FIG. 1 is a cross-sectional view showing a spray can 1 in a state before opening. The spray can 1 is an example of a two-component mixed spray container. As shown in FIG. 1, the spray can 1 is a disposable spray can, and is a first container 2, a second container 3 housed in the first container 2, a valve 4, a tube 5, and an opening pin. 6 and. Agent A and a propellant containing isocyanate as a main component are sealed in the first container 2. Agent B containing polyamine as a main component is sealed in the second container 3.

When the second container 3 is opened by the opening pin 6, the agent A of the first container 2 flows into the second container 3, and the mixture of the agent A and the agent B is pushed out into the first container 2. When the valve 4 is opened after shaking the spray can 1, a mixture of the agent A and the agent B flows into the tube 5 due to the pressure of the propellant. A static mixer 20 is built in the tube 5, and the mixture of the agent A and the agent B flowing through the tube 5 is sufficiently agitated and injected from the valve 4. Hereinafter, each configuration will be described in detail.

As shown in FIG. 1, the first container 2 is formed in a cylindrical shape and includes a body portion 11, a lid portion 12, and a bottom portion 13. The lid portion 12 has an opening 14 in the center. The opening 14 is covered with a mountain cup 15 for fixing the valve 4. A boss provided with a pin hole 16 is fixed to the bottom portion 13. The opening pin 6 is attached to the pin hole 16. In the first container 2, the body portion 11 and the bottom portion 13 may be integrally formed. A cap 17 that protects the opening pin 6 is attached to the bottom portion 13.

The tube 5 has a sufficient length to reach the bottom of the first container 2. The other end (free end) 5B on the side opposite to the one end 5A connected to the valve 4 is submerged in the liquid phase portion 100A of the first content 100. A static mixer 20 is installed inside the tube 5. In order to reduce the pressure loss due to the static mixer 20, the tube 5 is preferably thicker than a general spray can for painting. The attachment 21 has a small diameter portion that fits the valve 4 and a large diameter portion that fits the tube 5. The tube 5 is connected to the valve 4 via an attachment 21.

The static mixer 20 includes a right element 20A and a left element 20B. The alternately arranged right element 20A and left element 20B are connected in series. The right element 20A divides the fluid passing through the static mixer 20 into two and rotates it counterclockwise. The left element 20B divides the fluid passing through the static mixer 20 into two and rotates it clockwise. The two liquids passing through the static mixer 20 are stirred and mixed by the right element 20A and the left element 20B whose rotation directions are alternately switched.

The second container 3 is a container smaller than the first container 2 and is housed in the first container 2. The first container 2 may be referred to as a main can (outer container / outer can), and the second container 3 may be referred to as an inner can (inner container, inner can) or inner bag. The second container 3 is fixed by a holder 22 so as not to move inside the first container 2. The holder 22 is supported by, for example, a lid 12 that covers the body 11 of the first container 2. It may be fixed to the bottom 13 of the first container 2.

Agent A containing isocyanate as a main component is sealed as the first content 100 in the first container 2 together with the propellant. The agent B containing polyamine as a main component is sealed in the second container 3 as the second content 200. The second container 3 is not fully filled with the second content 200. The second container 3 has a residual internal space. In the following description, the first and second contents 100 and 200 may be simply referred to as contents. Further, the agent A may be referred to as a main agent, and the agent B may be referred to as a curing agent.

The isocyanate is, for example, an aliphatic isocyanate such as isophorone diisocyanate (IPDI). The isocyanate may be an aromatic isocyanate. Agent A may be a mixture in which a part of these isocyanates is reacted with a polyol to form a urethane prepolymer. The polyamine is an aromatic diamine such as diethylmethylbenzenediamine. The amount of the agent B enclosed in the second container 3 may be smaller than that of the agent A. An example of the compounding ratio (volume ratio) of agent B to agent A is agent A: agent B = 4: 1.

A polyurea composition having a long gel time is suitable for this embodiment. An example of gel time is 15 to 20 minutes. If the gel time is short, it may be adjusted by adding a curing retarder. The curing retarder dissolves with the agent A to reduce the viscosity of the agent A and delays the curing of the agent A mixed with the agent B. An example of a curing retarder is methyl ethyl ketone (MEK).

As the propellant, a liquefied gas-based propellant or a compressed gas-based propellant can be used. Examples of the liquefied gas-based propellant include liquefied gas-based propellants such as dimethyl ether (DME) and liquefied petroleum gas (LPG). Examples of the compressed gas-based propellant include compressed carbon dioxide gas and nitrogen gas.

A liquefied gas-based propellant is suitable as the propellant to be sealed in the first container 2. In particular, dimethyl ether is preferable. Since the liquefied gas-based propellant has a liquid phase in the can, it contributes to a decrease in the viscosity of the agent A. When the liquid phase contents 100 and 200 are atomized by the nozzle 44 of the push button 35, dimethyl ether expands more rapidly than the liquefied petroleum gas to form a very fine atomized polyurea. The internal pressure of the first container 2 in which the liquefied gas-based propellant is sealed is, for example, 2 to 4 atm at room temperature. The internal pressure of the second container in which the propellant is not sealed is, for example, 1 atm at room temperature.

Isocyanate, which is the main component of Agent A, is sensitive to moisture. The spray can 1 of the present embodiment includes a desiccant 23 and a desiccant sheet 24. The desiccant 23 is precipitated or dispersed in the liquid phase portion 100A of the first content 100. As the desiccant 23, for example, a powdery molecular sieve is suitable. If the desiccant 23 is in the form of pellets larger than the inner diameter of the tube 5, when the spray can 1 is used, the desiccant 23 accumulates at the free end 5B, which is the inlet of the tube 5, and the pressure loss of the tube 5 becomes large. Sometimes. If the desiccant 23 is in the form of powder, the desiccant 23 flows out together with the mixture of the agents A and B, so that clogging of the tube 5 can be prevented.

The desiccant sheet 24 contains a desiccant such as a molecular sieve, and is formed in a sheet shape that is taller than the depth of the liquid phase portion 100A. The desiccant sheet 24 is arranged so as to straddle both the liquid phase portion 100A and the gas phase portion 100B, and is in contact with the liquid phase portion 100A and the gas phase portion 100B. The desiccant sheet 24 is an example of a desiccant that comes into contact with the gas phase portion 100B. Further, at least a part of the valve 4 (for example, the housing 31) and the tube 5 according to the present embodiment are formed of a resin containing a desiccant such as a molecular sieve.

FIG. 2 is a cross-sectional view showing the inside of the valve 4 in the spray can 1 in use. As shown in FIG. 2, the valve 4 is fixed to the opening 14 of the first container 2 by the mountain cup 15. The valve 4 includes a housing 31, a stem 32, a coil spring 33, and a gasket (stem rubber) 34. The housing 31 is formed in a tubular shape having an upper cylinder portion 31A and a lower cylinder portion 31B having a diameter smaller than that of the upper cylinder portion 31A. The upper cylinder portion 31A is fixed to the mountain cup 15. One end 5A of the tube 5 is connected to the lower cylinder portion 31B.

The stem 32 is formed in a rod shape having a tip portion 32A protruding outward from the first container 2 and a base end portion 32B having a diameter larger than that of the tip portion 32A and inserted into the upper cylinder portion 31A of the housing 31. Has been done. A push button 35 is attached to the tip portion 32A of the stem 32. The stem 32 can move freely between the closed position where the tip portion 32A protrudes from the housing 31 and the open position where the tip portion 32A is relatively recessed in the housing 31 rather than the closed position. The stem 32 is in the closed position when the pushbutton 35 is in the position P1 indicated by the alternate long and short dash line in FIG. When the push button 35 is pressed at the position of P2 shown by the solid line in FIG. 2, the stem 32 moves to the open position. Even in the open position shown in FIG. 2, the protruding end of the stem 32 protrudes from the housing 31 and is exposed.

The stem 32 is urged toward the outside of the housing 31 by a coil spring 33 provided inside the housing 31. The tip portion 32A of the stem 32 has an injection hole 41 formed at a protruding end, a plurality of inflow holes 42 formed at equal intervals on the peripheral surface, and a flow path 43. The injection hole 41 and the inflow hole 42 communicate with each other via the flow path 43. The injection hole 41 communicates with the nozzle 44 provided in the push button 35.

The gasket 34 is formed in a disk shape with a through hole in the center and has flexibility. Butyl rubber (IIR) or perfluoroelastomer (FFKM) is suitable as the material of the gasket 34. The butyl rubber gasket 34 is resistant to isocyanate, methyl ethyl ketone, dimethyl ether and the like contained in the first content 100 according to the present embodiment. Moreover, it is easy to obtain. On the other hand, the perfluoroelastomer gasket 34 is more resistant than butyl rubber.

If the material of the gasket 34 is nitrile rubber (NBR), the gasket 34 may swell due to the isocyanate of the agent A or the methyl ethyl ketone of the curing retardant, which is not preferable. Fluororubber (FKM) is not preferable because the gasket 34 may swell due to dimethyl ether as a propellant or methyl ethyl ketone as a curing retardant.

The gasket 34 is provided on the upper cylinder portion 31A of the housing 31, and is covered with the mountain cup 15. The gasket 34 is deformed when it comes into contact with the tip portion 32A of the stem 32. The mountain cup 15 restricts the deformation of the gasket 34 only in the direction of bending inside the housing 31.

The stem 32, which is urged to the outside of the housing 31, is positioned in the closed position when the base end portion 31B abuts on the mountain cup 15 via the gasket 34. The gasket 34 closes the inflow hole 42 when the stem 32 is in the closed position. The inflow hole 42 is opened in a state where the stem 32 (push button 35) is pressed against the urging force of the coil spring 33. The valve 4 opens or closes the first container 2 due to the deformation of the gasket 34.

The spray can 1 of the present embodiment configured as described above has a second container 3 configured to allow the B agent to flow out when opened, and a first container configured to wrap the second container to receive the B agent flowing out. The container 2, the A agent and the propellant existing in the first container 2 and mixing with the B agent, the tube 5 connecting the mixture of the A agent and the B agent and the valve 4, and the tube 5 built in the tube 5. The static mixer 20 is provided. The static mixer 20 agitates the mixture of the A agent and the B agent flowing through the tube 5 by the pressure of the propellant.

According to the spray can 1 of the present embodiment, the two liquids can be easily mixed only by opening the second container 3. Small-scale construction is also possible and suitable for repair work and touch-up. The labor of the worker can be greatly reduced. Moreover, since it is a spray method that is not easily affected by the skill of the operator, the finish is more stable than hand painting.

Disposable spray cans are generally manufactured in a well-ventilated environment to avoid the risk of explosion. When a moisture-sensitive content such as a polyurea composition is enclosed in summer or rainy weather, the polyurea composition hardens inside the manufactured spray can, and the period during which the spray can can be stored is significantly shortened. In addition, the valve of the spray can is precisely formed. When the polyurea composition or gasket hardens inside the valve, the inflow hole of the valve becomes clogged.

The present embodiment includes a desiccant 23, a desiccant sheet 24, a valve 4 and a tube 5 in which a resin containing a desiccant is used for some members. The material of the gasket 32 is butyl rubber or perfluoroelastomer. The powdery desiccant 23 precipitated or dispersed in the liquid phase portion 100A rapidly removes the water content of the liquid phase portion 100A from the spray can 1 immediately after production. Therefore, the spray can 1 of the present embodiment can be stored for a long period of time. The powdery desiccant 23 is uniformly dispersed in the polyurea sprayed from the nozzle 44 and also functions as a filler for the coating film.

The tall desiccant sheet 24 and the tube 5 exposed from the liquid phase portion 100A remove the moisture in the gas phase portion 100B in which the valve 4 is arranged, and prevent the inflow hole 42 from being clogged. Further, the housing 31 of the valve 4 contains a desiccant to prevent clogging of the inflow hole 42. The gasket 32, which is resistant to the first content 100, does not harden for a long period of time and prevents clogging of the inflow hole 42.

The present embodiment includes a tube 5 in which the static mixer 20 is housed. Since the agents A and B pumped by the propellant are configured to pass through the static mixer 20, the agents A and B are sufficiently stirred and mixed even if the stirring before use is insufficient, and the polyurea is used. Can be injected. It can handle small-scale construction, repair work, touch-up after construction, etc. without the need for a large dedicated device.

In this embodiment, a liquefied gas-based propellant is sealed as the propellant. A curing retarder may be added to the agent A. Agents A and B whose viscosities have been lowered by a liquefied gas or a curing retardant can be sufficiently agitated inside the static mixer 20 with only the pressure of the propellant.

The present invention can be implemented by adding various modifications to the configuration of each of the embodiments described above. For example, the configurations disclosed in each embodiment may be combined as appropriate. The modified form without departing from the gist of the invention is included in the invention described in the claims and the equivalent range thereof.
For example, instead of the desiccant sheet 24, a desiccant stick formed in a rod shape may be arranged across both the liquid phase portion 100A and the gas phase portion 100B. A desiccant float having a lighter specific gravity than the liquid phase portion 100A may be formed, floated on the liquid phase portion 100A, and brought into contact with the liquid phase portion 100A and the gas phase portion 100B. The desiccant stick and the desiccant float are examples of the desiccant that comes into contact with the gas phase portion 100B, and are formed from a desiccant or a resin containing the desiccant, similarly to the desiccant sheet 24.

For example, although the opening means is provided on the bottom portion 13, the opening means may be provided on the lid portion 12. The opening means is not limited to the opening pin 6, and other configurations may be used. For example, a part or all of the second container 3 is formed of a fragile material such as glass, and when the spray can 1 is shaken strongly, the second container 3 collides with the first container 2 and is destroyed. The opening pin 6 may be omitted.

For example, liquids and powders that are not polyurea compositions may be applied as the first and second contents 100,200. The two-component mixing spray container of the present embodiment incorporating the static mixer 20 integrated with the tube 5 can sufficiently stir and mix the first content 100 and the second content 200 and inject them.

1 ... Spray can (an example of a two-component mixed spray container), 2 ... 1st container, 3 ... 2nd container, 4 ... Valve, 5 ... Tube, 5A ... one end, 5B ... other end, 6 ... Opening pin (opening means) Example), 14 ... opening, 20 ... static mixer, 24 ... desiccant sheet (an example of a desiccant in contact with the gas phase part), 100 ... first content, 100A ... liquid phase part, 100B ... gas phase part, 200 ... Second content.

Claims (8)

A first container containing a first content containing an isocyanate-based agent A and a propellant, and a first container.
A second container having an internal pressure lower than the internal pressure of the first container, which is housed in the first container and is filled with a second content containing a B agent containing a polyamine as a main component ,
A valve provided in the opening of the first container and
Housed in the first container, one end connected to said valve, a tube and the other end is submerged in the first content,
An opening means capable of opening the second container and
A static mixer incorporated in the tube,
A powdery desiccant contained in the liquid phase portion of the first content,
The nozzle mounted on the valve and
Equipped with a,
When the second container is opened by the opening means and the valve is opened, the mixture of the agent A and the agent B flows into the tube due to the pressure of the propellant, and the mixture is stirred by the static mixer. It is a two-liquid mixing spray container, characterized that you polyurea is ejected from the nozzle. The two-component mixed spray container according to claim 1 , wherein the polyurea sprayed from the nozzle contains the powdery desiccant. The two-component mixed spray container according to claim 1 or 2, wherein the first content contains a curing retarder that delays the curing reaction between the agent A and the agent B. It is accommodated in the first container, according to claim 1 to 3, characterized in that further comprising the desiccant sheet arranged in a state in contact with both the liquid phase and the gas phase portion of the first content The two-component mixed spray container according to any one item. The two-component mixed spray container according to any one of claims 1 to 4, wherein the tube is formed of a resin containing a desiccant. The valve
With the housing fixed inside the first container,
A stem having an injection hole provided at the tip, an inflow hole provided on the peripheral surface, and a flow path connecting the injection hole and the inflow hole, and inserted into the housing.
A gasket that opens and closes the inflow hole,
With
The two-component mixed spray container according to any one of claims 1 to 5, wherein the housing is formed of a resin containing a desiccant. The two-component mixing spray container according to claim 6, wherein the gasket is formed of butyl rubber or perfluoroelastomer. The first container has a pin hole at the bottom and has a pin hole.
The opening / closing means is an opening pin mounted in the pin hole.
The two-component mixed spray container according to any one of claims 1 to 7, wherein a cap for protecting the opening pin is attached to the bottom of the first container.

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