JP2006219173A - Method for packaging curing silicone composition and packaging container - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a packaging method and packaging container in which a temperature of curing silicone composition can be kept for a specified period of time while preventing the curing silicone composition from being condensed and the temperature can be held at -40°C to 0°C. <P>SOLUTION: There is provided a method for packaging curing silicone composition characterized in that both a packaged curing silicone composition and regenerative material are packaged within a first container to keep the temperature of the curing silicone composition at -40°C to 0°C, and both the first container and dry ice are packaged in a second container. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a packaging method and a packaging container that can maintain the temperature of the curable silicone composition at -40 to 0 ° C.

  Since the one-component curable silicone composition undergoes a curing reaction even at room temperature, it must be stored and transported from -40 ° C. to ensure a predetermined viscosity and flowability from production to use. It is essential to carry out at a low temperature of 0 ° C. Conventionally, as a packing method for storage and transportation at such a low temperature, a silicone composition in a container is placed in a cold insulation case made of foamed polystyrene or the like, and a predetermined amount of dry ice is placed above or on the side. The arrangement method is common.

  However, in such a conventional packing method, since the inside of the cold insulation case is cooled to around -78 ° C, which is the sublimation point of dry ice, the temperature becomes lower than the desired storage / transport temperature, and the silicone composition solidifies. May end up. In general, when using a silicone composition stored at a low temperature, an operation of gradually returning the temperature from low temperature to room temperature over several hours, that is, “return to normal temperature” is required. When the silicone composition solidified during storage and transportation as described above is returned to room temperature, bubbles may be generated inside the composition. In this way, when bubbles are generated inside the composition, it is necessary to defoam before use. Therefore, the solidification of the silicone composition during storage and transportation becomes a factor that deteriorates workability. Therefore, development of a packaging method capable of storing and transporting the silicone composition at a desired constant temperature within a range of −40 ° C. to 0 ° C. for a certain period is desired.

  As such a packing method, a method of arranging a silicone composition in a container in a cold insulation case made of foamed polystyrene or the like and arranging a predetermined amount of a cold storage material around it can be considered. By this method, the temperature of the silicone composition during storage / transport can be kept constant. The temperature is determined by the temperature at which the regenerator material can be held constant. Therefore, the temperature at the time of transportation can be set to a desired temperature by appropriately selecting the type of the regenerator material. However, in ordinary cold storage materials, the time during which the temperature can be kept constant is about 24 hours, so in the case of longer-term storage and transportation, for example, overseas transportation, the silicone composition throughout the entire period It is difficult to keep the temperature constant.

  In order to solve the above-mentioned problems of the prior art, the present invention stably maintains the temperature of the curable silicone composition at −40 to 0 ° C. for a certain period while preventing the solidification of the curable silicone composition. An object of the present invention is to provide a packing method and a packing container that can be used.

  As a result of intensive studies to solve the above problems, the present inventors have found that the above object can be achieved by the following packing method and packing container, and have completed the present invention.

That is, the present invention firstly keeps the temperature of the curable silicone composition at −40 to 0 ° C.
Packing the packaged curable silicone composition and the cold storage material in a first container;
Provided is a packaging method for a curable silicone composition, wherein the first container and dry ice are packaged in a second container.

Secondly, the present invention is a packaging container for maintaining the temperature of the curable silicone composition at −40 to 0 ° C. suitable for carrying out the above method,
A first container for packing the packaged curable silicone composition and the cold storage material;
There is provided a packing container comprising the first container and a second container for packing dry ice.

  With the packing method and packing container of the present invention, the temperature of the curable silicone composition can be stably maintained at −40 to 0 ° C. for a certain period while preventing the curable silicone composition from coagulating. Further, in the second container, the temperature in the first container can be adjusted by disposing the plate-like body between the first container and the dry ice, and as a result, the curable silicone composition The temperature of the object can be adjusted to the desired temperature. Therefore, since the curable silicone composition can be stored and transported in a wide temperature range of −40 ° C. to 0 ° C. by the packaging method and packaging container of the present invention, the deterioration of the quality of the curable silicone composition is prevented. The curable silicone composition can be used without defoaming after returning to room temperature.

  Hereinafter, the present invention will be described in detail.

[Packing method]
In the packaging method of the present invention, the packaged curable silicone composition and the cold storage material are packaged in a first container so that the temperature of the curable silicone composition is maintained at −40 to 0 ° C. One container and dry ice are packed in a second container. A plate-like body may be disposed between the first container and the dry ice. In this packing method, the amount of the curable silicone composition, the amount of the cold storage material, the amount of dry ice, the volume of the second container, the material of the first container, the second container, and the plate-like body are appropriately set. By selecting, the temperature of a curable silicone composition can be hold | maintained at -40-0 degreeC.

[Packing container]
The packaging container of the present invention is a packaging container for maintaining the temperature of the curable silicone composition at −40 to 0 ° C., and is used for packing the packaged curable silicone composition and the cold storage material. One container and a second container for packing the first container and dry ice are provided. By applying the packaging method of the present invention to this packaging container, the temperature of the curable silicone composition can be maintained at -40 to 0 ° C.

  FIG. 1 is a longitudinal sectional view showing an example of a packaging container to which the packaging method of the present invention is applied. In FIG. 1, the packaged silicone composition 1 is arranged on the bottom surface inside the first container 2, and the cold storage material 3 is arranged around the silicone composition 1. Inside the second container 4, the dry ice 5 is disposed on the bottom surface, the plate-like body 6 is disposed above it, and the first container 2 is disposed further above. The temperature of the silicone composition 1 is maintained at −40 to 0 ° C. by the cold storage material 3. The cooling effect by the dry ice 5 extends to the inside of the first container 2 through the plate-like body 6 and the wall surface of the first container 2, and the cooling effect by the regenerator material 3 is maintained for a longer time. By disposing the dry ice 5 outside the first container 2, it is possible to prevent the temperature in the first container 2 from being lowered more than necessary. Moreover, the plate-like body 6 adjusts the cooling effect of the dry ice 5 that reaches the inside of the first container 2 and adjusts the temperature of the curable silicone composition 1 to a desired temperature. The plate-like body 6 also acts as a support for stably arranging the first container 2 on the dry ice 5.

[Packaged curable silicone composition]
The silicone composition packed by the method of the present invention is not particularly limited. Since the progress of the curing reaction of the one-part curable silicone composition can be prevented in the range of −40 to 0 ° C., the method and container of the present invention are particularly suitable for the one-part curable silicone that cures by hydrosilylation addition reaction. It is effective for the composition.

  The packaging form of the curable silicone composition is not particularly limited, and examples thereof include those usually used in transactions. Specific examples thereof include containers such as cans, bottles, tubes, syringes, and bags. The material of these containers is not particularly limited, and examples thereof include metals such as stainless steel, glass, plastics, and resin films according to the type of each container.

[Cool storage material]
The regenerator material used in the present invention is not particularly limited as long as the holding temperature is in the range of −40 to 0 ° C. For example, a known regenerator material can be used. In the present invention, the “holding temperature” refers to a constant temperature at which the regenerator material cooled below that temperature continues to be maintained as its own temperature for a certain period of time. Specific examples of the cold storage material include Cool Planet manufactured by Planets Co., Ltd., and examples of the holding temperature include −20 ° C. and −35 ° C.

  Although the usage form of a cool storage material is not specifically limited, Preferably, it uses, for example in the form enclosed with the plastic case, the bag made from a resin film, etc.

  The amount of the regenerator material used is preferably 1 kg or more, more preferably 1 to 10 kg per 1 kg of the curable silicone composition. When the amount used is within this range, the temperature of the curable silicone composition can be easily and uniformly maintained around the holding temperature of the cold storage material.

[dry ice]
The form of dry ice is not particularly limited, but for example, a solidified shape such as a brick shape or a stick shape is preferably used so that the cooling effect lasts as long as possible.

  The amount of dry ice used is preferably 0.1 kg or more, more preferably 0.1 to 5 kg per 10 liters of the volume of the first container. When the amount used is within this range, the cooling effect of the cold storage material can be maintained for a longer time while preventing the temperature in the first container from dropping more than necessary. As a result, the temperature of the curable silicone composition can be held for a long time around the holding temperature of the cold storage material.

[First container and second container]
The shape, structure, and the like of the first container are not particularly limited as long as the curable silicone composition and the cold storage material can be accommodated therein and used in the method and container of the present invention. Moreover, the shape, structure, etc. of the second container are not particularly limited as long as the first container and the dry ice can be accommodated therein and used in the method and container of the present invention. Examples of the shape of these containers include a rectangular parallelepiped shape, a legislature shape, a cylindrical shape, and the like. For example, the structure includes a lid and a container body, a side wall surface, a top surface and / or a door on the bottom surface. The structure etc. which have are mentioned.

  The first container and the second container are preferably made of a heat insulating material. For the first container, the thermal conductivity coefficient of the heat insulating material is preferably 0.1 W / m · K or less (that is, 0 to 0.1 W / m · K), more preferably 0.05 W / m · K or less. (That is, 0 to 0.05 W / m · K). If the thermal conductivity coefficient is within this range, the cooling effect of dry ice outside the first container will appropriately reach the inside of the first container, preventing the temperature in the first container from dropping more than necessary. However, the cooling effect by the cold storage material can be maintained for a longer time. For the second container, the thermal conductivity coefficient of the heat insulating material is preferably 0.1 W / m · K or less (ie, 0 to 0.1 W / m · K), more preferably 0.05 W / m · K or less. (That is, 0 to 0.05 W / m · K). When the heat conduction coefficient is within this range, the heat insulation inside and outside the second container is sufficient. Examples of the heat insulating material include polystyrene foam.

  The thickness of the wall surface of the first container is preferably 0.5 to 10 cm, more preferably 1 to 10 cm, and even more preferably 3 to 6 cm. If the thickness is within this range, the cooling effect of the dry ice outside the first container appropriately reaches the inside of the first container, so that the temperature in the first container is prevented from being lowered more than necessary. The cooling effect by the cold storage material can be maintained for a longer time.

  Further, the thickness of the second container is preferably 0.5 to 10 cm, more preferably 1 to 10 cm, and even more preferably 3 to 6 cm. When the thickness is within this range, heat insulation inside and outside the second container is sufficient.

[Arrangement]
As long as the temperature of the packaged curable silicone composition is maintained at −40 to 0 ° C., the arrangement of the curable silicone composition and the cold storage material is not particularly limited in the first container. For example, the regenerator material may be disposed only on a part of the upper, lower and side portions of the curable silicone composition, or the regenerator material may be disposed on all of them. Moreover, you may make a curable silicone composition and a cool storage material contact, and you may leave a space | interval between both.

  In addition, as long as the temperature of the packaged curable silicone composition is maintained at −40 to 0 ° C., the arrangement of the first container and the dry ice in the second container is not particularly limited. For example, the dry ice may be disposed only on a part of the upper side, the lower side, and the side of the first container, or the dry ice may be disposed on all of them. Further, the first container and dry ice may be brought into contact with each other, or an interval may be provided between them.

  A person skilled in the art appropriately selects both of the above arrangements according to the amount of the curable silicone composition, the cold storage material and the dry ice; the volume, material and wall thickness of the first and second containers. be able to.

[Plate]
In the method of the present invention, a plate-like body having a thickness of preferably 0.5 cm or more, more preferably 1 cm or more, and even more preferably 1 to 5 cm is provided between the first container and the dry ice. You may arrange. By using this plate-like body, the cooling effect of dry ice reaching the inside of the first container can be adjusted, so that the temperature of the curable silicone composition can be adjusted to a desired temperature. The plate-like body can also be used as a first container or a dry ice support. For example, if the first container is directly disposed above the dry ice in the second container, the stability of the first container may be deteriorated if the height of the dry ice is not uniform. In such a case, a 1st container can be more stably arrange | positioned by arrange | positioning a plate-shaped body between both as a support body.

  Such a temperature adjustment effect by the plate-like body can be controlled by increasing or decreasing its thickness. Those skilled in the art will know the amount of curable silicone composition, cold storage material and dry ice; volume of first and second containers, material and wall thickness; The thickness of the plate-like body that can adjust the temperature of the composition to a desired temperature can be appropriately selected. This thickness may be realized by a single plate-like body, or a plurality of plate-like bodies may be laminated to realize this thickness as a whole. Further, in consideration of the material, the thickness may be selected so as to have sufficient strength as a support.

  The plate-like body is usually separated from the second container, but may be provided in the second container. That is, for example, the inside of the second container may be partitioned by a plate-like body into a chamber for storing the first container and a chamber for storing the dry ice.

  The plate-like body is preferably made of a heat insulating material. The thermal conductivity coefficient of the heat insulating material is preferably 0.1 W / m · K or less (that is, 0 to 0.1 W / m · K), more preferably 0.05 W / m · K or less (that is, 0 to 0). .05 W / m · K). When the thermal conductivity coefficient is within this range, the temperature adjustment effect by the plate-like body can be appropriately obtained. Examples of the heat insulating material include polystyrene foam. Further, for example, a two-layer structure including a heat insulating material layer and a metal layer may be used so as to have sufficient strength as a support.

  Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples, but the present invention is not limited thereto.

  As a test sample, a 1 kg one-component addition-curable silicone composition (trade name: KJR-9100) divided and filled in a transparent syringe (volume: 10 ml, manufactured by EFD) so that the internal state can be observed. -1, Shin-Etsu Chemical Co., Ltd.) was used. The initial value of the viscosity of the silicone composition (viscosity when packed in a container) was 23.5 Pa · s (23 ° C.). In order to indirectly measure the temperature of the silicone composition, a digital thermometer was placed adjacent to the syringe containing the silicone composition.

(Example 1)
FIG. 1 is a longitudinal sectional view showing an example of a packaging container to which the packaging method of the present invention is applied. As shown in FIG. 1, a foamed polystyrene container composed of a lid and a container body was used as the first container 2. As the second container 4, a polystyrene foam container having an inner volume of 200 liters composed of a lid and a container body was used. The silicone composition 1 and a digital thermometer (not shown) are arranged on the bottom surface inside the first container 2, and the holding temperature is set so that the periphery (side and upper) is completely covered. 5 kg of -35 ° C regenerator material 3 (trade name: Cool Planet, manufacturer name: Planets) was placed. Thereafter, the lid of the first container 2 was closed and sealed with gummed tape. Next, 15 kg of brick-like dry ice 5 is placed on the bottom surface inside the second container 4, one 5 cm thick polystyrene foam plate 6 is placed above it, and further above it A first container 2 was placed. Thereafter, the lid of the second container 4 was closed and sealed with gummed tape to produce a package.

(Example 2)
Use a regenerator material (product name: Cool Planet, manufacturer: Planets Co., Ltd.) with a retentive temperature of -10 ° C instead of a regenerator material with a retentive temperature of -35 ° C. Except for the change, the silicone composition was packaged in the same manner as in Example 1 to prepare a package.

(Comparative Example 1)
FIG. 2 is a longitudinal sectional view showing an example of a conventional packing container. As shown in FIG. 2, the above silicone composition 1 and a digital thermometer (not shown) are placed on the bottom surface of a polystyrene foam container 7 having an internal volume of 50 liters, and a brick-like dry 10 kg of ice 5 was placed. Thereafter, the lid of the container 7 was closed and sealed with gummed tape to prepare a package.

(Measurement)
These packages were stored in a warehouse at room temperature of 25 ° C. for 4 days, and then observed and measured as follows. First, the state of the silicone composition immediately after taking out from each package, that is, whether or not it was solidified was visually observed. Moreover, the generation | occurrence | production state of foam was visually observed about this silicone composition which returned to normal temperature. Further, in order to confirm whether or not the curing progressed during storage, the viscosity was measured at 23 ° C. with a BM type rotational viscometer manufactured by Tokimec. These results are shown in Table 1. In addition, FIG. 3 shows changes in temperature measured with a digital thermometer bundled with the silicone composition.

(Evaluation)
In the package of the example, the indirectly measured temperature of the silicone composition was maintained almost constant for 4 days at the holding temperature of the cold storage material. It was observed that the silicone composition immediately after removal from the package was not solidified. Therefore, no foam was observed even after returning to room temperature. The viscosity value was within the range of the standard value. Thus, the silicone composition after being stored in the packaging body of the example was in a state where it could be used without any problem immediately after returning to room temperature.

  On the other hand, in the package of the comparative example, the temperature of the silicone composition measured indirectly decreased to around −75 ° C. several hours after packaging. It was observed that the silicone composition immediately after removal from the package was solidified. Therefore, countless bubbles were observed in the silicone composition after returning to room temperature. The viscosity value was within the range of the standard value. Thus, the silicone composition after being stored in the package of the comparative example is not in a state where it can be used without any problem immediately after returning to room temperature, and it was necessary to remove bubbles inside the composition before use.

It is a longitudinal cross-sectional view which shows an example of the packing container to which the packing method of this invention was applied. It is a longitudinal cross-sectional view which shows an example of the conventional packing container. It is a graph which shows transition of the temperature of the silicone composition measured indirectly in the Example and the comparative example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Packaged silicone composition 2 First container 3 Cold storage material 4 Second container 5 Dry ice 6 Plate-like body 7 Styrofoam container

Claims (11)

In order to maintain the temperature of the curable silicone composition at −40 to 0 ° C.,
Packing the packaged curable silicone composition and the cold storage material in a first container;
A packaging method for a curable silicone composition, wherein the first container and dry ice are packaged in a second container.   The packaging method according to claim 1, wherein the cold storage material is used in an amount of 1 kg or more per kg of the curable silicone composition, and the dry ice is used in an amount of 0.1 kg or more per 10 liters of the second container. .   The packing method according to claim 1 or 2, wherein the first container and the second container are made of a heat insulating material.   The packing method according to any one of claims 1 to 3, wherein a plate-like body is disposed between the first container and the dry ice.   The packing method according to claim 4, wherein the plate-like body is made of a heat insulating material.   The packing method according to claim 3 or 5, wherein the heat insulating material is a polystyrene foam. A packaging container for maintaining the temperature of the curable silicone composition at -40 to 0 ° C,
A first container for packing the packaged curable silicone composition and the cold storage material;
A packaging container comprising the first container and a second container for packaging dry ice.   The packaging container according to claim 7, wherein the first container and the second container are made of a heat insulating material.   The packaging according to claim 7 or 8, wherein the inside of the second container is partitioned by a plate-like body into a chamber for storing the first container and a chamber for storing the dry ice. container.   The packaging container according to claim 9, wherein the plate-like body is made of a heat insulating material. The packaging container according to claim 8 or 10, wherein the heat insulating material is a polystyrene foam.

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