JPH06336272A - Foam aerosol can - Google Patents

Abstract

PURPOSE:To obtain a foam aerosol can by which a foam having a uniform cell structure and high expansion ratio can be manufactured in a simple and easy way and at a low cost. CONSTITUTION:Mutually independent flexible bags 3a, 3b are respectively filled with two liquid agents of main agent A and curing agent B together with inert gas; these two flexible bags 3a, 3b are respectively inserted via on-off valves 6a, 6b into one can 1 sealing a pressurizing liquefied gas or high-pressure gas G; and a confluence part 7 is provided on the outlet side of the on-off valves 6a. 6b and a discharge nozzle 8 is connected to the confluence part 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aerosol can in which two liquid agents are mixed and foamed and discharged to be cured to form a foam. More specifically, a foam having a uniform cell structure and a high expansion ratio can be easily prepared. The present invention relates to a foam aerosol can that can be manufactured.

[0002]

2. Description of the Related Art Conventionally, as a portable aerosol can in which two liquid agents, a main agent and a curing agent, are contained in one package, and the two liquid agents are mixed and cured while foaming and discharging, the main can is foamed. While the main agent of the body is filled with liquefied gas for pressurization (generally liquefied propane gas) and air, a configuration in which a sub-can filled with liquefied gas and air of a curing agent is also inserted in this main can is used. Was there.

However, since the aerosol can is filled with the main agent and the curing agent in a state of being in contact with the pressurizing gas at all times, it is good when the main agent is mixed with the curing agent due to the influence of the contact of the pressurized gas. There is a drawback in that it may not be possible to obtain a foamed state. Moreover, when the foam is discharged, the pressurizing gas is also injected and consumed at the same time, so that it is necessary to increase the amount of pressurizing gas to be filled per one package can, resulting in a very high cost. It was inevitable.

[0004]

DISCLOSURE OF THE INVENTION An object of the present invention is to provide an aerosol can for a foam, which can easily manufacture a foam having a uniform cell structure and a high expansion ratio and can be manufactured at a low cost. Especially.

[0005]

An aerosol can for foams according to the present invention that achieves the above object is obtained by filling two liquid agents, a main agent and a curing agent for the main agent, in independent flexible bags together with air. The two flexible bags are inserted into a single can, which is sealed with a liquefied gas or high-pressure gas for pressurization through an on-off valve, and a confluence section is provided on the outlet side of the on-off valve. A discharge nozzle is connected to the portion.

As described above, since the pressurizing gas is always kept isolated from the main agent and the curing agent by using the flexible bag, the pressurizing gas becomes a foam when the main agent contacts the curing agent. Up to now, it is possible to keep the base material and the like in a non-contact state at all times, so that the foaming action is not affected by the pressurized gas. In addition, the pressurizing gas is always filled in the can, and unlike the conventional aerosol can, it is not injected outside the can, so the pressurizing gas can be used in a small amount and can be produced at low cost. to enable.

Further, in the case of discharging the non-contact type two liquid agent as in the above-mentioned constitution, there is a problem that variations in discharge ratio and incomplete mixing are likely to occur. However, regarding this variation in the discharge ratio, the structure is such that two on-off valves are opened and closed at the same time, and a liquid passage is provided from the inlet side of each on-off valve to the liquid agent in the flexible bag. The above-mentioned problem can be solved by quantitatively feeding the liquid agent through the culm.

Further, in the mixed state between the two liquid agents or with the inert gas, a lump having a higher specific gravity than that of the liquid agent is filled in the flexible bag and vibrated to form a liquid agent in the flexible bag. If the inert gas is dispersed and mixed, the air that serves as the foaming core will be sufficiently contained, and a good mixed state can be obtained. Further, if a static mixer is arranged between the merging portion and the discharge nozzle, the mixed state can be further improved.

The foam applied to the present invention is not particularly limited, but it is particularly useful when used in a silicone rubber foam. As a material for forming such a silicone rubber foam, an organopolysiloxane having two or more silanol groups in one molecule, for example, a diorganopolysiloxane having silanol groups blocked at both ends as a main component is contained in one molecule. It is preferable to use an organohydrogenorganopolysiloxane containing two or more silicon-bonded hydrogen atoms as a curing agent and a condensation reaction accelerating catalyst such as a platinum compound or an organic tin compound as a curing catalyst.

In this case, the main component is a diorganopolysiloxane having silanol groups blocked at both ends and a platinum compound catalyst.
A diorganopolysiloxane having silanol groups at both ends and an organohydridogen polysiloxane having two or more silicon-bonded hydrogen atoms in one molecule are used as curing agents, and the main agent and the curing agent are mixed at a volume ratio of about 1: 1. What is preferred is.

Another example of a foam is a soft or rigid polyurethane foam. These are mainly composed of diisocyanate or polyisocyanate, and a mixture of polyol and water as a curing agent. Further, as the inert gas used in the present invention, air, nitrogen, argon and the like can be mentioned, but among them, air is particularly preferable from the viewpoint of easy handling. The volume ratio of the main agent and the curing agent filled in the flexible bag to the inert gas is 20: 1 to
It is preferably in the range of 1: 1.

The present invention will be described below with reference to the embodiments shown in the drawings. In the embodiment shown in FIG. 1, reference numeral 1 denotes a metal can having a closed structure, and a liquefied propane gas is filled therein as a pressurizing gas G. This can 1 may be made of resin. 2 is a discharge part, 3a, 3b is a flexible bag, respectively. The flexible bags 3a and 3b are preferably made of a resin film such as polyethylene or polypropylene.

One flexible bag 3a is filled with a liquid base material A so that an air layer of an inert gas is present thereabove, and the other flexible bag 3b is filled with a liquid curing agent B. Is also filled so that an air layer of an inert gas is made to coexist thereabove. The main agent A is brought into a foamed state by contact-mixing with the curing agent B in the presence of air to undergo a curing reaction, and becomes a foam containing a large number of bubbles. In the flexible bags 3a and 3b filled with the liquid agent in this manner, the main agent A and the curing agent B are always kept in a state of being separated from the pressurizing gas G, and the pressurizing gas G applies pressure from the outside. .

Into the flexible bags 3a and 3b, spherical lumps 4a and 4b having higher specific gravities than the main agent A and the curing agent B are inserted. In addition, a gutter-shaped liquid passage 5
a and 5b are inserted, the upper end thereof is connected to the ejection portion 2, and the lower end thereof is immersed in the liquid main agent A and the curing agent B. On-off valves 6a and 6b are provided in the discharge part 2 to which the liquid passages 5a and 5b are connected, and on-off valves 6a and 6b are provided.
A common merging portion 7 is provided on the outlet side of b. Further, a discharge nozzle 8 is connected to the outlet of the confluence portion 7, and a static mixer 13 is provided in the discharge nozzle 8.

The valve bodies 9a and 9b of the on-off valves 6a and 6b are connected to one knob 11 via rods 10 respectively, and by operating the knob 11 up and down, the two bodies move up and down at the same time. It has become. The knob 11 is biased upward by the spring 12, and this biasing forces the valve body 9
The a and 9b are always held in the upper position.

Each of the valve bodies 9a and 9b has an L-shaped passage, and the lower end side of the L-shaped passage is always communicated with the liquid culms 5a and 5b. On the other hand, the upper end sides of the L-shaped passages are bent toward the confluence portion 7 side, respectively.
When 9b is held in the upper position, it is in a closed state with respect to the merging portion 7, but when pushed downward, the L-shaped passages of the two valve bodies 9a, 9b are connected to the merging portion 7. It is designed to communicate at the same time.

A gas vent valve 14 is provided at the bottom of the can 1. The gas vent valve 14 is for venting the pressurizing gas such as liquefied propane gas remaining inside when the used aerosol can is discarded. In the aerosol can having the above structure, when the main agent and the curing agent are discharged, the following operation is performed.

First, the entire aerosol can is vibrated up and down,
Due to the vibration, the lumps 4 in the flexible bags 3a and 3b are
a and 4b are reciprocated between the liquid agents A and B and the air layer,
Make sure that the liquid is filled with air. Then knob 1
When 1 is pressed, the two on-off valves 6a and 6b simultaneously open to the merging portion 7. Since the pressure of the merging portion 7 is the same as the atmospheric pressure, the main agent A and the curing agent B, which have entrapped the air in the flexible bags 3a and 3b, are changed to the pressurizing gas G by opening the opening / closing valves 6a and 6b. Are simultaneously pushed out to the merging part 7 by the pressurizing action from the outside. Two-fluid agent is a junction 7
The mixed reaction occurs in the foaming state, and the mixture is discharged from the discharge nozzle 8 to form a cured foam.

In the discharge operation of the main agent and the curing agent as described above, the pressurizing gas G only presses the flexible bags 3a and 3b from the outside, and the main agent A is used as in the conventional aerosol can.
Since it does not come into direct contact with the curing agent B or the curing agent B, the foaming state is not hindered. Further, since the pressurizing gas G is always filled in the can and is not injected and consumed to the outside, the main agent and the curing agent are discharged only by filling the can with a small amount of pressurizing gas. be able to.

In the above operation, the lump 4 has the function of improving the dispersibility of bubbles by causing the main agent A and the curing agent B to wrap air as a foaming core. The material of the lump 4 that performs such an action is not particularly limited as long as it has a larger specific gravity than the main agent A and the curing agent B. For example, metal, glass, ceramic, hard resin or the like can be used. In addition, the spherical shape is most preferable as the shape of the lump 4, but in addition to this, a cylindrical shape, a rectangular shape, a pyramidal shape,
Various things such as a conical shape can be adopted.

Further, when the static mixer 13 is disposed after the merging portion, the mixing of the main agent A and the curing agent B and further the mixing with the air are promoted, and a better mixed state can be obtained. The liquid passing culms 5a, 5b serve to measure the main agent A and the curing agent B in the flexible bags 3a, 3b by a fixed amount and send them to the on-off valves 6a, 6b. On-off valve 6
It is preferable that the valves a and 6b are simultaneously opened as in the above-mentioned embodiment, so that the liquid agents, which are fed in a fixed amount as described above, are simultaneously merged into the merging portion 7, so that the main agent A and the curing agent B are discharged. The ratio can be stabilized.

As a form of the liquid flow culms 5a and 5b used here, a gutter type as shown in FIG. 2 is the most excellent in terms of measuring property. However, the shape is not limited to this, and may be a tube shape as shown in FIG. 3, for example.

[0023]

EXAMPLE Using the aerosol can shown in FIG. 1, the following organopolysiloxane composition as the main component A and air as the inert gas were enclosed in the flexible bag 3a at a volume ratio of 8: 2. Dimethylpolysiloxane with both ends of the molecular chain blocked with silanol groups (viscosity at 25 ° C is 2,000 centipoise) 75 parts by weight Dimethylpolysiloxane with both ends of the molecular chain blocked with silanol groups (viscosity at 25 ° C is 80 centipoise) ) 15 parts by weight Fluoropropylene group-containing silicone resin 7.0 parts by weight Isopropyl alcohol solution of chloroplatinic acid 3.0 parts by weight In the same manner, in the flexible bag 3b, the following organopolysiloxane composition was used as the curing agent B. Enclosed.

Dimethylsiloxane / methylhydrogenpolysiloxane copolymer with both ends of the molecular chain blocked with trimethylsiloxane groups 25 parts by weight Dimethylpolysiloxane with both ends of the molecular chain blocked with silanol groups (viscosity at 25 ° C. 2,000 centipoise) 60 parts by weight Dimethylpolysiloxane with both ends of the molecular chain blocked with silanol groups (viscosity at 25 ° C. is 80 centipoise) 15 parts by weight Tetramethyltetravinylcyclosiloxane 0.2 parts by weight Main ingredient as described above The aerosol can filled with A and the curing agent B was shaken up and down several times, and then the knob was pushed to perform the discharging operation. The discharged mixture of the main agent A and the curing agent B gradually foamed to form a foam. Was formed.

The expansion ratio was measured and found to be 7 times. Also, when observing the cut surface of the foam with a microscope,
It was a foam having a uniform cell structure. For comparison,
When the flexible bag 3a was filled with the main agent A, an aerosol can having the same configuration as that described above was prepared except that the volume ratio of the main agent A was set to 10: 0 so that an air layer was not left.
When this aerosol can was discharged, the foaming ratio of the discharged foam was only 3 times, and the cell structure formed inside was also non-uniform.

[0026]

As described above, the aerosol can for foam according to the present invention uses a flexible bag to separate the main agent and the curing agent from the pressurizing gas, and the main agent and the curing agent are foamed. Since the pressurized gas is brought into a non-contact state until it becomes a body, the foaming action is not hindered by the influence of the pressurized gas, and a foam in a good foamed state can be obtained.

Further, since the pressurizing gas is always filled in the can and is not injected and consumed together with the main agent as in the conventional aerosol can, the amount of pressurizing gas used is reduced and the foam aerosol is low in cost. Cans can be produced.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an aerosol can for foam according to an embodiment of the present invention.

FIG. 2 is a perspective view showing an example of a liquid passing culvert used in the present invention.

FIG. 3 is a perspective view showing another example of the liquid passing culvert used in the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 can 2 discharge part 3a, 3b flexible bag 4a, 4b lump body 5a, 5b passage culm 6a, 6b open / close valve 7 confluence part 8 discharge nozzle 9a, 9b valve body 11 knob 13 static mixer

Claims (5)

[Claims] 1. A two-liquid agent consisting of a main agent and a curing agent is filled in an independent flexible bag together with an inert gas, and the two flexible bags are liquefied for pressurization through respective on-off valves. An aerosol can for foams, in which gas or high-pressure gas is inserted into a sealed can, a confluence part is provided on the outlet side of the on-off valve, and a discharge nozzle is connected to the confluence part. 2. The liquid culm according to claim 1, which has a structure for simultaneously opening and closing both of the two on-off valves, and is provided with a liquid passage that extends from the inlet side of each on-off valve to the liquid agent in the flexible bag. Aerosol can for foam. 3. The foam aerosol can according to claim 1, wherein a lump having a specific gravity higher than that of the liquid agent filled in each flexible bag is inserted into each of the flexible bags. 4. The aerosol can for foam according to claim 1, wherein a static mixer is arranged between the merging portion and the discharge nozzle. 5. The aerosol can for foam according to claim 1, wherein the foam is a silicone rubber foam.