JPH0565181A - Sealed container - Google Patents

Abstract

PURPOSE:To provide a sealed container which can prevent the damages to the wall of an incinerator by making sealed high pressure can, aerosol can, etc., nonexplosive, since, when the conventional can is thrown into the incinerator after use, the solvent residue in the container is heated and the resulting vapor increases the pressure inside the can to cause the blasting of such cans. CONSTITUTION:In a sealed container rigidly joined at least a container body 1 and a valve having a spray member 3 (on its mountain cup) or a lid 2, a small hole or recess part 4 is formed in a part of the valve or lid. The small hole or recess part 4 is sealed or filled with the material (low temp. melting substance) meltable at a temp. lower than that of the material of the container body 1. As a result, when the sealed container is thrown into the incinerator, the low temp. melting substance is melted away when as its temp. becomes higher to decrease the pressure inside the container, thereby preventing the blasting of the can.

Description

Detailed Description of the Invention

[0001]

The present invention relates to a pressure can, an aerosol can,
Regarding other closed containers, in detail, a part of the valve or lid firmly joined to the upper part of the container body is composed of a substance that melts at a lower temperature than the container body, and it will explode when placed in a high temperature atmosphere. The present invention relates to a highly-safe closed container that does not wake up.

[0002]

2. Description of the Related Art Sealed containers such as pressure cans and azeol cans are filled with various contents (for example, electrophotographic developer, insecticide, cosmetics, liquids such as paints, powders, etc.) for general life. Is becoming more closely related.

On the other hand, however, when these used closed containers are slid into the incinerator, the solvent remaining in the container is heated and the vapor increases the internal pressure and explodes. It has become a social problem to damage the wall surface of the incinerator.

[0004]

DISCLOSURE OF THE INVENTION The present invention provides a hermetically sealed container which is safe and does not cause an explosion flame even if the internal pressure rises due to heating.

[0005]

According to the present invention, in a closed container in which at least a container body and a valve or a lid having an injection member are firmly joined, a part of the valve or the lid has a temperature lower than that of the material of the container body. It is characterized by being composed of a substance that melts at.

As a result of investigations to eliminate the problems and dangers of the closed container, the present inventors have found that it is extremely effective to employ a low-temperature melting substance for a part of the bubble or the lid. I confirmed. The present invention has been made thereby.

The present invention will be described in more detail below with reference to the accompanying drawings.

The drawing (FIG. 1) shows an outline of an example of a closed container according to the present invention, 1 is a container body, 2 is a mountain cup portion or lid of a valve, and 3 is attached to these valves or lids. The injection members 4 are small holes or small recesses (however, the small holes or small recesses are filled and sealed with a substance that melts at a temperature lower than the material of the container body).

The closed container is not limited to a pressure can, but is typically a pressure can. The pressure can is a general pressure can such as a spray can, a piston can, a back-in can, and a sepro can. As the pressure source, chlorofluorocarbon, LPG, propane, N ₂ , CO ₂ or the like may be used alone or as a mixed gas.

After the contents, such as a developer, are filled in such a container transformation body 1, the valve or lid 2 having the injection member 3 according to the present invention is firmly joined to the container body 1. In this case, either adhesion or screwing may be used, but adhesion is more reliable.

By the way, such a closed container is generally made of tin, iron, stainless steel, aluminum or the like, and can withstand an internal pressure of up to about 15 kg / cm ² . However, as mentioned above, when it is heated, the internal pressure is 15 kg / cm, depending on the contents.
It becomes ² or more, and the sealed container burns explosively.

Therefore, in the present invention, a part of the valve or lid 2 of the closed container is a heat-melting substance (low-temperature melting substance) which melts at a temperature of preferably 105 to 200 ° C., more preferably 120 to 150 ° C. As a result, the heat-melting substance forming part of the valve or lid 2 of the pressure can is melted at the time of heating to form a small hole, from which the contents and / or the pressure source (mainly the pressure source) is discharged. The means to reduce the pressure is to prevent the explosion and flame of the closed container.

The heat-fusible substance here is a metal, an ionomer resin, a polyolefin or a copolymer thereof, and a valve or lid for a can is provided with a small hole or a small concave portion, and the small hole or the concave portion is 105 ° C. to 200 ° C. A valve or lid is made by sealing or filling with a substance that melts at a temperature of ° C. The valve or lid of the hermetically sealed container made in this way can withstand an internal pressure of around 15 kg / cm ² at room temperature, and at high temperatures the heat-melting substance melts to form a through hole in the valve or lid. It works to reduce the internal pressure of.

A typical example of the heat-meltable metal is (No.1) Pb (40%)-Sn (58%)-Sb (2%) 108 ° C (No.2) Pb (50%)-Sn ( 50%) 106 ° C (No.3) Pb (60%)-Sn (38%)-Sb (2%) 120 ° C (No.4) Pb (40%)-Sn (38%)-Cd (19% ) -Zn (2%) 118 ° C (No.5) Pb (40%)-Sn (20%)-Bi (40%) 136 ° C (No.6) Pb (96%)-Ag (3%)- In (1%) 115 ° C (No.7) Pb (30%)-Sn (30%)-Ni (40%) 159 ° C (No.8) Pb (40%)-Sb (10%)-Al ( 40%)-Sn (10%) 146 ° C (No. 9) Pb (50%)-Bi (50%) 125 ° C. Incidentally,% in parentheses is% by weight, and the temperature at the right end is the melting temperature (hereinafter the same).

Examples of the ionomer resin include (No. 10) ethylene / methyl methacrylate / maleic anhydride copolymer (Zn crosslink) 142 ° C. (No. 11) ethylene / ethyl methacrylate / methacrylic acid copolymer (Al crosslink) ) 136 ° C (No.12) Propylene / ethyl methacrylate / acrylic acid copolymer (Zn cross-linking) 125 ° C, etc. The ionomer resin has a structure represented by Chemical Formula 1, and can be said to be a resin in which a metal is crosslinked.

[Chemical 1] That is, in the ionomer resin, a part of the carboxylic acid group is cross-linked with a metal ion between molecules, and unlike a general chemical bond, this cross-linked product has a weak binding force due to heat,
It has the property of flowing out. In addition, the ionomer resin is at room temperature to
Very strong and moderate elasticity in the range of about 100 ℃,
It has film-forming properties and good adhesion to metal surfaces. Further, it is as excellent in solvent resistance as the polyolefin copolymer.

Examples of the polyolefin or its copolymer are (No. 13) propylene / methyl methacrylate copolymer 115 ° C. (No. 14) ethylene / glycidyl methacrylate / methacrylic acid copolymer 121 ° C. (No. 15) An example is ethylene / propylene copolymer 109 ° C.

As mentioned above, the container body is made of a material that does not melt below 400 ° C. On the other hand, although the valve, the lid and the like are made of the same material, a part of them is made of a substance that melts at 105 to 200 ° C. The reason why the temperature is limited in this way is derived from the following.

(1) Closed container (often a metal can)
Is put in an incinerator, the temperature in the incinerator is 800 to 1200 ° C in the flame part and 400 ° C or more in the surrounding area.
It is quite hot. Therefore, it is necessary to use a material that does not melt at 400 ° C. or lower, except where a heat-melting substance that forms a part of the valve or the lid that serves as a safety valve exists. (2) When the internal pressure of the closed container becomes 8 kg / cm ² or more in the incinerator, etc., if the heat-melting substance that constitutes the safety valve or part of the lid melts at around 105 ° C. The heat-fusible substance causes crevices due to the difference in the substance, has no solvent resistance, and dissolves or swells, so that the contents leak from the vicinity of the heat-fusible substance. In particular, this leakage is observed as a phenomenon in which only the solvent in the contents seeps out. In addition, if a safety valve for a valve or a lid is made of a substance that melts at 200 ° C. or higher, it does not melt unless it reaches a considerably high temperature, so that it does not function as a safety valve, and is disadvantageous in terms of workability. Therefore, as the heat-melting substance that serves as the safety valve, one that melts at a temperature of 105 to 200 ° C. is selected.

The number, size, etc. of the sealing or joining points of the low-temperature fusible substance, which will be the safety valve of the valve or the lid, are generally determined because the kind and amount of the solvent for injection and other factors are related. I can't. In general, can manufacturing should be performed within a reasonable range.

[0020]

EXAMPLES Examples will be shown below, but the present invention is not limited thereto. Further, although the content is used as a developer here, as mentioned above, it may be an insecticide, a paint, or anything else.

Example 1 In a spray can container made of tin having an internal volume of 210 ml similar to that shown in FIG.
It was filled with a mixture of 0.5 g of baking soda and 1.4 g of citric acid, and a small hole having a diameter of 3 mm was opened in the mountain cup portion, and the above No. A small hole was plugged with the heat-meltable metal of 1. The pressurized can was put into an incinerator and burned, but no explosion occurred. It is considered that the heating melted the alloy that sealed the valve small hole portion, and the heating melted the alloy that sealed the valve small hole portion and the contents flowed out from the small hole. (Liquid Developer of Production Example 1) Phthalocyanine blue (manufactured by Dainichiseika) 500 g LMA / GMA / MAA (molar ratio 80/10/10) copolymer 100 g Kerosene 500 g A mixture was dispersed in a ball mill for 48 hours. A wet toner (solid content 54.5%, viscosity 580 cp) was prepared.

Example 2 A tin-made back-in can container having an internal volume of 210 ml similar to that shown in FIG.
And the diameter of the mountain cup is 0.3mm.
2 small holes are made and the above No. 10 ionomer resin is used to cover the small holes, butane gas is used to adjust the internal pressure to 10 kg / cm ^2.
A pressure can containing the liquid developer was prepared. The pressure canister was placed in an incinerator and burned, but no explosion occurred. This is probably because, as in Example 1, the ionomer resin that sealed the small holes was softened by heating and the contents flowed out from the small holes. Furthermore, no leakage of the contents was observed in this pressure can even 6 months after the contents were filled. For comparison, when a thermoplastic acrylic resin (methyl methacrylate resin) having a melting temperature of 102 ° C. was used in place of the No. 10 ionomer resin, the contents of the mountain cup portion were found 20 days after the contents were filled. It was observed that it leaked from a small hole provided in the. (Liquid Developer of Production Example 2) Special Black 40 (manufactured by Degussa) 500 g SMA / vinyl pyridine (molar ratio 90/10) copolymer 100 g Isopar H 600 g A mixture was dispersed for 20 hours with an attritor to prepare a wet toner. (Solid content 60%, viscosity 960 cp) was prepared.

Example 3 A liquid developer 80 of the following Production Example 3 was placed in a piston can container made of aluminum having an internal volume of 210 ml similar to that shown in FIG.
g, and the mountain cup part has a diameter of 2.5 m.
a small hole of m. A pressure can containing a liquid developer was manufactured in which a small hole was covered with the heat-meltable metal of No. 9, and the internal pressure was increased to 10 kg / cm ² with Freon gas. No explosion occurred when the pressure can was put into a combustion reactor and burned. This is the same as in Example 1, where the alloy in the small holes is melted by heating,
It is probable that the contents leaked from the small holes. Furthermore, no leakage of the contents was observed in this pressure can even after 6 months had passed after filling the contents. (Liquid developer of Production Example 3) Printex-V (manufactured by Degussa) 500 g (brushing colorant (200 g / E.300.300 g) CMA / AMA / MMA (molar ratio 84/5/10) copolymer 100 g A mixture of 5,400 g of Isopar E was dispersed for 6 hours with a kedi mill to prepare a wet toner (solid content 9.8%, viscosity 15 cp).

Example 4 The above-mentioned No. No. 1 in place of the heat-meltable metal. No. 11 ionomer resin or No. 11 above. A closed container was prepared in the same manner as in Example 1 except that the polyolefin copolymer of 13 was used, and the container was placed in an incinerator in the same manner as in Example 1, and no explosion occurred.

Example 5 An experiment was conducted in the same manner as in Example 1 except that the liquid developer was replaced with an insecticide or paint, and no explosion occurred in the incinerator.

[0026]

According to the closed container of the present invention, even when it is exposed to a high temperature (when it is in a flame, when it is put into an incinerator, etc.), the heat-meltable substance melts and small holes are formed. The perforated or heat-fusible substance peels off, and the rise in internal pressure is suppressed from that portion. Therefore, the closed container is prevented from exploding and burning.

[Brief description of drawings]

FIG. 1 shows an outline of a closed container according to the present invention.

[Explanation of reference numerals] 1 container body 2 mountain cup portion or lid of valve 3 injection member 4 small hole or small recess (sealed or filled with a heat-melting substance)

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hidemi Uematsu 1-3-3 Nakamagome, Ota-ku, Tokyo Inside Ricoh Co., Ltd.

Claims (3)

[Claims] 1. A closed container in which at least a container body and a valve or lid having an injection member are firmly joined,
A closed container, wherein a part of the valve or the lid is made of a substance that melts at a temperature lower than that of the material of the container body. 2. The closed container according to claim 1, wherein the material of the container body is made of a material that does not spray below 400 ° C., and a part of the material of the valve or the lid is made of a material that melts at 105 to 200 ° C. .. 3. The valve or lid has a small hole or a small recess and is made of a material that does not melt at 400 ° C. or lower, and the small hole or the small recess is filled and sealed with a substance that is a solvent at 105 to 200 ° C. The closed container according to claim 1.