Method of filling curable composition

Abstract

To improve storage stability of a curable composition filled (accommodated) in a container by preventing a gap between the curable composition filled (accommodated) in an outer peripheral edge part of a can body and a moisture prevention film.SOLUTION: A method for filling a curable composition includes the steps of: filling a hermetically sealable container with a curable composition; laying a moisture prevention film on the surface of the curable composition; pressing the moisture prevention film by a push plate with a convex bottom surface to integrate the moisture prevention film with the curable composition; and sealing a container with a lid.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a method for filling a container with a curable composition. [Background technology]

[0002] Curable compositions are used as sealing materials, adhesives, and putty materials for buildings, civil engineering, and automobiles. These curable compositions are prepared by blending additives such as curing catalysts, fillers, and thixotropy-imparting agents with curable resins such as isocyanate group-containing resins and crosslinkable silyl group-containing resins. In consideration of the method of use, the curable compositions are stored in sealed containers such as cartridges and pails.

[0003] For example, when a curable composition is stored in a pail can, a film is laid on the surface of the curable composition to insulate the curable composition from the outside air (moisture), and then the container body and the lid are fitted together to seal (for example, Patent Documents 1-2). These prior documents disclose methods for blocking the stored curable composition from moisture in the air. Specifically, Patent Document 1 describes a method in which the surface of the curable composition is covered with a moisture barrier film and a seal surface is formed on the periphery of the film to block moisture, and Patent Document 2 describes a method in which the surface of the curable composition is covered with a moisture barrier film and the vicinity of the periphery of the film is intentionally exposed to moisture in the air to form a cured product with a sealing performance, and moisture in the air is blocked by the moisture barrier film and the cured product. The methods described in these prior documents are effective for blocking the curable composition from moisture.

[0004] Now, since the curable compositions used in sealing materials, adhesives, putties, etc. are generally viscous materials having thixotropy, if the pressure applied by a pressure plate or the like is insufficient when covering the surface of the curable composition with a moisture barrier film, a gap may be generated between the periphery of the moisture barrier film and the curable composition (the periphery of the container). Even if the pressure is sufficient and no gap is generated between the periphery of the moisture barrier film and the curable composition, a gap may be generated over time, and the curable composition in the gap may thicken or harden into a ring shape, so improvement is required. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 3-162269 [Patent Document 2] Japanese Patent Application Publication No. 9-150866 Summary of the Invention [Problem to be solved by the invention]

[0006] In view of the above problems, the present invention aims to provide a method for filling a curable composition, which can prevent the occurrence of gaps between the filled (stored) curable composition and a moisture prevention film at the peripheral part of a container, and can prevent the curable composition from thickening in the gap or curing into a ring shape. [Means for solving the problem]

[0007] As a result of intensive research, the present inventors have found that a method for filling a curable composition, which includes the steps of filling a sealable container with the curable composition, laying a moisture prevention film on the surface of the curable composition, pressing the curable composition with a pressing plate having a convex portion on the bottom surface to integrate the moisture prevention film and the curable composition, and sealing the container with a lid, can prevent the generation of voids between the filled (stored) curable composition and the moisture prevention film at the periphery of the container. That is, the present invention is the following aspects (1) to (14).

[0008] (1) filling a sealable container with a curable composition; providing a moisture barrier film on the surface of the curable composition; A step of pressing the moisture prevention film with a pressing plate having a convex portion on a bottom surface thereof in a state where the convex portion faces the moisture prevention film, thereby integrating the moisture prevention film and the curable composition; sealing the container with a lid; A method for filling a hardenable composition comprising the steps of: (2) The filling method according to (1), wherein the convex portion is a curved portion formed in an arc shape when viewed from the side over the entire bottom surface. (3) A filling method as described in (1), wherein the convex portion has an arc-shaped curved area formed on the periphery of the bottom surface in a side view, and a linear flat area formed from the periphery of the bottom surface to the center thereof and continuous with the curved area. (4) The filling method described in (1), wherein the convex portion has a first curved surface region that is arc-shaped in side view and formed on the peripheral edge of the bottom surface, and a second curved surface region that is arc-shaped in side view and formed from the peripheral edge of the bottom surface to the center, and has a radius of curvature larger than the radius of curvature of the first curved surface region that is arc-shaped in side view. (5) A filling method according to any one of (1) to (4), wherein the sealable container has a cylindrical, elliptical or rectangular cylindrical shape with a bottom surface at the bottom, an opening is provided at the top of the container, and the container becomes sealable by fitting the opening with a lid. (6) The method for filling according to any one of (1) to (5), wherein the moisture-proof film is a composite film of aluminum and resin. (7) The strength of the moisture-proof film measured by a tensile performance test is 20 to 100 N / mm 2 The method for filling according to any one of (1) to (6), (8) The method for filling according to any one of (1) to (7), wherein the moisture prevention film has an elongation of 5% or more as measured in a tensile performance test. (9) The filling method according to any one of (1) to (8), wherein the viscosity of the curable composition measured at 25° C. at 1 rpm using an E-type viscometer is 150 to 400 Pa·s. (10) The filling method according to any one of (1) to (9), wherein the curable composition has a thixotropic index of 3 to 6 at 25° C. as measured at 1 rpm / 10 rpm using an E-type viscometer. (11) The filling method according to any one of (1) to (10), wherein the moisture prevention film and the curable composition are integrated by the step of integrating the moisture prevention film and the curable composition, and the curable composition is protected from moisture. (12) The filling method according to any one of (1) to (11), wherein the step of integrating the moisture prevention film and the curable composition integrates the moisture prevention film and the curable composition, thereby insulating the curable composition from moisture, and also tightly attaching the moisture prevention film to a sealable inner circumferential surface of the container in whole or in part. (13) The filling method according to any one of (1) to (12), characterized in that, by integrating the moisture prevention film with the curable composition, the moisture prevention film and the curable composition are integrated, the curable composition is protected from moisture, and the moisture prevention film and the curable composition are convex toward the bottom surface of the container. (14) A structure in which the curable composition is filled into the sealable container by the filling method according to any one of (1) to (13), and the container is sealed with the lid.

[0009] In the above aspect, "side view" means a state viewed from a direction perpendicular to the pushing direction of the push plate. Effect of the Invention

[0010] According to the method for filling the curable composition of the present invention, the curable composition is filled (stored) at the periphery of the container. Since it is possible to prevent the formation of voids between the curable composition and the moisture prevention film, it is possible to prevent the curable composition in the voids from thickening or curing into a ring shape, thereby improving the storage stability of the curable composition filled (stored) in the container. [Brief description of the drawings]

[0011] [Figure 1] FIG. 2 is a side cross-sectional view of a pressing plate according to a first embodiment of the present invention used in the method for filling a curable composition of the present invention. [Diagram 2] 4 is a side cross-sectional view of a pressing plate according to a second embodiment of the present invention used in the method for filling a curable composition. FIG. [Diagram 3] 10 is a side cross-sectional view of a pressing plate according to a third embodiment used in the method for filling a curable composition of the present invention. FIG. [Figure 4] FIG. 1 is a side cross-sectional view showing step 1 of the method for filling the curable composition of the present invention. [Diagram 5] FIG. 2 is a side cross-sectional view showing step 2 of the method for filling the curable composition of the present invention. [Figure 6] FIG. 2 is a side cross-sectional view showing step 3 of the method for filling the curable composition of the present invention. [Figure 7] FIG. 4 is a side cross-sectional view showing step 4 of the method for filling the curable composition of the present invention. [Figure 8] FIG. 4 is a side cross-sectional view showing step 5 of the method for filling the curable composition of the present invention. [Figure 9] 1 is a side cross-sectional view showing a sealed structure of a hardenable composition filled by a method for filling a hardenable composition of the present invention using a pressing plate according to a first embodiment. FIG. [Figure 10] 11 is a side cross-sectional view showing a sealed structure of a hardenable composition filled by the hardenable composition filling method of the present invention using a pressing plate according to a second embodiment. FIG. [Figure 11] 13 is a side cross-sectional view showing a sealed structure of a hardenable composition filled by the hardenable composition filling method of the present invention using a pressing plate according to a third embodiment. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] First, a press plate having a convex portion on the bottom surface used in the method for filling the curable composition of the present invention will be described with reference to Figures 1 to 3. The press plate having a convex portion on the bottom surface shown in Figures 1 to 3 is used to cover the surface of the curable composition with the moisture prevention film by laying a moisture prevention film on the surface of the curable composition after filling (storing) the curable composition in a sealable container, and by pressing the moisture prevention film with the press plate to integrate it with the curable composition, to block the curable composition from moisture in the air. In this specification, blocking from moisture by the moisture prevention film means a state in which moisture is completely prevented from passing through the moisture prevention film, or the curable composition can be prevented from significantly thickening or curing even if moisture passes through.

[0013] First, the press plate according to the first embodiment will be described. FIG. 1 is a side cross-sectional view of the press plate according to the first embodiment used in the method for filling the curable composition of the present invention. As shown in FIG. 1, the press plate 18 according to the first embodiment has a bottom surface 1, a top surface 12 facing the bottom surface 1, a side surface 2 connecting the bottom surface 1 and the top surface 12, and a handle 3 attached to the top surface 12. The bottom surface 1 is provided with a convex portion 13 protruding in the opposite direction to the top surface 12. As will be described later, the convex portion 13 of the press plate 18 is placed in a state where it faces a moisture prevention film (not shown in FIG. 1), and the moisture prevention film is pressed by the press plate 18.

[0014] In the press plate 18, the convex portion 13 is a curved surface portion 14 formed in an arc shape in a side view on the entire bottom surface 1. That is, the entire bottom surface 1 is curved, and the bottom surface 1 is substantially convex arc-shaped (curved) from its center 15 toward the outer periphery 16. The radius of curvature of the convex portion 13, which is arc-shaped in a side view, is substantially the same over the entire bottom surface 1. From the above, the center 15 of the bottom surface 1 is the most protruding aspect. The radius of curvature of the convex portion 13, which is arc-shaped in a side view, is not particularly limited, but is, for example, 50 to 15,000 mm, and preferably 100 to 7,000 mm.

[0015] The shape of the upper surface 12 facing the bottom surface 1 is not particularly limited. The entire surface is flat. At the center of the top surface 12, there is a handle 3 that an operator grasps when carrying the press plate 18 to the moisture prevention film inside the container, pressing the moisture prevention film, and removing the press plate 18 from the moisture prevention film. The handle 3 improves the convenience of the above operations.

[0016] 1, the side surface 2 connecting the bottom surface 1 and the top surface 12 is provided along the outer peripheral edge 16 of the bottom surface 1. The side surface 2 is provided perpendicular to the top surface 12 from the outer peripheral edge 16 of the bottom surface 1 toward the top surface 12.

[0017] Next, the press plate according to the second embodiment will be described. Fig. 2 is a side cross-sectional view of the press plate according to the second embodiment used in the method for filling the curable composition of the present invention. Note that the same components as those of the press plate according to the first embodiment will be described using the same reference numerals.

[0018] In the press plate 18 according to the first embodiment, the convex portion 13 is a curved surface portion 14 formed in an arc shape in a side view on the entire bottom surface 1. Instead, in the press plate 28 according to the second embodiment, as shown in FIG. 2, the convex portion 23 formed on the bottom surface 1 has a curved surface area 21 formed on the periphery 26 of the bottom surface 1 in an arc shape in a side view, and a flat area 22 formed from the periphery 26 of the bottom surface 1 to the center 25 and in a linear shape in a side view, which is continuous from the curved surface area 21. In the press plate 28, only the curved surface area 21 is a curved surface portion. Therefore, in the press plate 28, only the periphery 26 of the bottom surface 1 is a curved surface portion, and only the periphery 16 of the bottom surface 1 is in an arc shape (curved shape). The periphery 26 of the bottom surface 1 is the curved surface area 21, so that the convex portion 23 is formed on the bottom surface 1. The radius of curvature of the periphery 26, which is in an arc shape in a side view, is approximately the same. The radius of curvature of the curved surface region 21 that is arc-shaped in side view is not particularly limited, but is preferably, for example, 10 to 26 mm.

[0019] On the other hand, flat region 22 is a flat surface (flat portion), and center 25 of bottom surface 1 is flat. Flat region 22 is parallel to top surface 12, which is also a flat surface. As described above, bottom surface 1 has a generally convex shape from center 25 toward periphery 26. The range of curved region 21 is not particularly limited, but has an area of ​​10% to 50% of the entire area of ​​bottom surface 1, for example.

[0020] Next, the press plate according to the third embodiment will be described. Fig. 3 is a side cross-sectional view of the press plate according to the third embodiment used in the method for filling the curable composition of the present invention. Note that the same components as those of the press plates according to the first and second embodiments will be described using the same reference numerals.

[0021] In the press plate 18 according to the first embodiment, the convex portion 13 is a curved surface portion 14 formed in a side-view arc shape on the entire bottom surface 1, and the radius of curvature of the convex portion 13 is approximately the same over the entire bottom surface 1. Instead, in the press plate 38 according to the third embodiment, as shown in FIG. 3, the convex portion 33 has a first curved surface region 31 formed on the periphery 36 of the bottom surface 1 and having a side-view arc shape, and a second curved surface region 32 formed from the periphery 36 of the bottom surface 1 continuous with the first curved surface region 31 to the center 35, the second curved surface region 32 having a larger radius of curvature than the radius of curvature of the first curved surface region 31. Both the first curved surface region 31 and the second curved surface region 32 are curved surface portions formed on the bottom surface 1.

[0022] That is, in the press plate 38, the entire bottom surface 1 is curved, but the degree of curvature of the peripheral edge 36 of the bottom surface 1 is greater than the degree of curvature of the central portion 35. The radius of curvature of the first curved surface region 31, which is arc-shaped in side view, is substantially the same throughout the first curved surface region 31. Moreover, the radius of curvature of the second curved surface region 32, which is arc-shaped in side view, is substantially the same throughout the second curved surface region 32. From the above, the press plate 38 also has a configuration in which the central portion 35 of the bottom surface 1 protrudes the most. The radius of curvature of the first curved surface region 31, which is arc-shaped in side view, is not particularly limited, but is preferably 10 to 26 mm, for example. Moreover, the radius of curvature of the second curved surface region 32, which is arc-shaped in side view, is substantially the same throughout the second curved surface region 32. The radius of curvature of the surface region 32 is not particularly limited, but is, for example, 50 to 15,000 mm, and preferably 100 to 7,000 mm.

[0023] The range of the first curved surface region 31 is not particularly limited, but for example, it has an area of ​​10% to 50% of the entire area of ​​the bottom surface 1.

[0024] The shape of the handle 3 is not particularly limited as long as it allows the push plates 18, 28, 38 to be carried and pressed, and can be any known shape.

[0025] The diameter of the bottom surface 1 of the pressing plates 18, 28, 38 is preferably 1 to 20 mm smaller, and particularly preferably 1 to 10 mm smaller, than the inner diameter of the container (e.g., a can body) in which the curable composition is filled (stored). In the case of a tapered can in which the inner diameter of the container decreases from the opening to the bottom, the diameter is preferably 1 to 20 mm smaller, and particularly preferably 1 to 10 mm smaller, than the inner diameter of the container at the position where the curable composition and the moisture prevention film are integrated by pressing with the pressing plates 18, 28, 38.

[0026] There are no particular limitations on the material of the presser plates 18, 28, 38, so long as it is possible to press the moisture prevention film, integrate the moisture prevention film and the curable composition, and cover the surface of the curable composition with the moisture prevention film. Examples of materials for the presser plates 18, 28, 38 include aluminum, stainless steel, iron, copper, porcelain, pottery, ceramic, wood, natural stone, artificial stone, concrete, glass, plastic, and hard paper.

[0027] Next, the method for filling the curable composition of the present invention will be described in accordance with the procedure with reference to Figures 4 to 8. Note that the procedure for filling the curable composition shown below is an example, and the present invention is not limited to this procedure. Also, for convenience of explanation, the description will be given using the press plate 18 according to the first embodiment as the press plate.

[0028] Step 1 of filling method of hardenable composition 4 shows a side cross-sectional view of the concept of installing a filling nozzle 5 capable of discharging a curable composition 6 in a sealable can body 4 (container body). The filling nozzle 5 is preferably installed on the center of the bottom surface of the can body 4. In this case, when the curable composition 6 is discharged from the filling nozzle 5, the curable composition is filled (stored) without being unevenly distributed in the can body 4. The can body 4 is placed on a measuring device (not shown), and the curable composition can be measured while being filled into the can body 4.

[0029] Step 2 of filling method of hardenable composition 5 shows a side cross-sectional view of the concept of filling (storing) a curable composition 6 into a sealable can body 4 (container body) through a discharging filling nozzle 5. A measuring device (not shown) in which the can body 4 is installed can be linked to a discharge control device (not shown) of the filling nozzle 5 to automatically fill the curable composition 6 to a preset volume. Also, a flow meter can be installed in the filling nozzle 5 to automatically fill the curable composition 6 to a preset volume.

[0030] Step 3 of filling method of hardenable composition 6 shows a side cross-sectional view of the concept of filling (storing) a curable composition 6 in a sealable can body 4 (container body) and laying a moisture prevention film 7 on the surface of the curable composition 6. The moisture prevention film 7 is laid so that the (planar) center of the moisture prevention film 7 coincides with the center of the bottom surface of the can body 4. The size of the moisture prevention film 7 may be the same as the inner diameter of the can body 4, or may be larger than the inner diameter of the can body 4.

[0031] Step 4 of the method for filling the hardenable composition FIG. 7 shows a cross-sectional side view of a concept in which a curable composition 6 is filled (stored) in a sealable can body 4 (container body), and the moisture prevention film 7 laid on the surface of the curable composition 6 and the curable composition 6 are pressed with a press plate 18 to integrate the moisture prevention film 7 and the curable composition 6. The moisture prevention film is pressed with the press plate 18 in a state in which the convex portion 13 of the press plate 18 faces the moisture prevention film 7. It is preferable that the press plate 18 be pressed carefully so that no gap is generated between the moisture prevention film 7 and the curable composition 6. As shown in FIG. 7, when the size of the moisture prevention film 7 is larger than the inner diameter of the can body 4, the moisture prevention film 7 is bent along the side surface 2 of the press plate 18 when pressed with the press plate 18, and the moisture prevention film 7 is in full or partial contact with the inner peripheral side surface of the can body 4. When the moisture prevention film 7 adheres to the inner peripheral side surface of the can body 4, the effect of protecting the curable composition 6 from moisture in the air is enhanced, so when the moisture prevention film 7 is pressed by the press plate 18, it is preferable to bring the folded moisture prevention film 7 into contact with the inner peripheral side surface of the can body 4 by the side surface 2 of the press plate 18, thereby adhering the moisture prevention film 7 to the inner peripheral side surface of the can body 4. Furthermore, if the adhesion between the folded moisture prevention film 7 and the inner peripheral side surface of the can body 4 is insufficient after the moisture prevention film 7 is pressed by the press plate 18, it is preferable to adhere the moisture prevention film 7 to the inner peripheral side surface of the can body 4 by touching with fingers or using a tool such as a spatula.

[0032] If it is difficult to bring the moisture prevention film 7 and the inner peripheral side surface of the can body 4 into close contact with each other, a liquid material may be placed between the moisture prevention film 7 and the inner peripheral side surface of the can body 4 to an extent that it can block moisture in the air. The liquid material is preferably a compound that does not react with the curable composition 6 and water such as moisture. Examples of the liquid material include plasticizers such as phthalic acid esters and adipic acid esters, and resins obtained by reacting the hydroxyl groups of polyoxyalkylene polyols or polyoxyalkylene monools having a number average molecular weight of 300 to 5,000 with isocyanate compounds or carboxylic acid compounds to form urethane or esters. In place of the above liquid material, heavy calcium carbonate, fatty acid surface-treated calcium carbonate, fine powdered silica, or the like may be blended with these plasticizers or resins and mixed uniformly to form a paste. The number average molecular weight in this specification is a value measured by gel permeation chromatography (GPC) in terms of polystyrene.

[0033] Step 5 of the method for filling the hardenable composition FIG. 8 shows a cross-sectional side view of the concept of filling (storing) a curable composition 6 in a sealable can body 4 (container body), and fitting the can body 4 (container body) in which the surface of the curable composition 6 is integrated with a moisture prevention film 7, and a can lid 9 equipped with a seal 10. The moisture prevention film 7 and the curable composition 6 laid on the surface of the curable composition 6 are pressed with a press plate 18 to integrate the moisture prevention film 7 and the curable composition 6, and then the press plate 18 is separated from the moisture prevention film 7, and the lid can 9 is attached to the can body 4. The can body 4 is fitted with the can lid 9 via the seal 10 to form a sealed structure. Before fitting the can body 4 and the can lid 9 via the seal 10, dry air or dry nitrogen can be blown into the can body 4 using an air gun or the like to replace the air (containing moisture) in the can body 4.

[0034] Fig. 9 is an example of a side cross-sectional view showing a sealed structure of a curable composition 6 filled by the filling method of the present invention. The sealed structure of Fig. 9 uses a press plate 18 according to the first embodiment shown in Fig. 1. In Fig. 9, the surface of the curable composition 6 and the moisture prevention film 7 that are pressed and integrated by the press plate 18, facing the can lid 9, has a shape corresponding to the shape of the protrusion 13 of the press plate 18, and is a substantially convex arc shape toward the bottom surface of the can body 4. A desiccant 11 is laid on the moisture prevention film 7 for the purpose of removing moisture in the air.

[0035] Fig. 10 is an example of a side cross-sectional view showing a sealing structure of the curable composition 6 filled by the filling method of the present invention. Fig. 10 uses a pressing plate 28 according to the second embodiment shown in Fig. 2. In Fig. 10, the surface of the curable composition 6 and the moisture prevention film 7 that are pressed and integrated by the pressing plate 28, facing the can lid 9, has a shape corresponding to the shape of the protrusion 23 of the pressing plate 28.

[0036] Fig. 11 is an example of a side cross-sectional view showing a sealing structure of the curable composition 6 filled by the filling method of the present invention. Fig. 11 uses a pressing plate 38 according to the third embodiment shown in Fig. 3. In Fig. 11, the surface of the curable composition 6 and the moisture prevention film 7 that are pressed and integrated by the pressing plate 38, facing the can lid 9, has a shape corresponding to the shape of the protrusion 33 of the pressing plate 38.

[0037] 4 to 8, it is possible to prevent voids from occurring between the curable composition 6 and the moisture prevention film 7 at the peripheral portion of the can body 4. Prevention of void formation can prevent the generation of thickened matter or hardened matter of the curable composition around the void portion, thereby improving the storage stability of the curable composition filled (stored) in the container.

[0038] The mechanism of the occurrence of gaps between the curable composition and the moisture prevention film at the periphery of the can body (container body) is presumed to be as follows. The curable composition filled (stored) in the can body is often higher than the outside air temperature of the filling work site in order to ensure fluidity during filling. After filling the curable composition and sealing the can body with a can lid, the curable composition cools from the periphery of the can body and causes volumetric shrinkage. At this time, if the moisture prevention film integrated with the curable composition cannot follow the volumetric shrinkage of the curable composition, gaps are likely to occur between the curable composition and the moisture prevention film at the periphery of the can body. There is also a method of softening the moisture prevention film to prevent the occurrence of gaps, but if the moisture prevention film is softened, handling may be poor when the moisture prevention film is laid on the surface of the curable composition, and wrinkles may occur in the moisture prevention film when it is pressed with a pressing plate. In addition, reducing the thickness of the moisture prevention film to soften it is not preferable because the moisture prevention performance of the film decreases.

[0039] In contrast, when the method for filling the curable composition of the present invention is used, the integrated curable composition and moisture prevention film have a shape having a convex portion toward the bottom surface of the can body, i.e., a concave portion corresponding to the shape of the convex portion of the pressure plate, and the peripheral portion of the concave portion rises toward the top surface of the can body, thereby preventing voids on the peripheral portion of the can body that occur due to volumetric shrinkage of the curable composition.

[0040] The shape of the can body 4 (container body) is not particularly limited as long as it can be filled (stored) with the curable composition 6 and sealed with the can lid 9. Specific examples of shapes that can be used include a cylindrical, elliptical, or rectangular cylindrical shape with the lower part of the can body 4 being the bottom surface (having a bottom surface) and the upper part of the can body 4 being open (ceiling surface), which allows for easy filling with the curable composition 6, is easy to obtain and transport, and is easy to work with when using the curable composition 6.

[0041] The material of the can body 4 (container body) is not particularly limited as long as it can be blocked from the outside air (particularly moisture such as humidity) after being filled (stored) with the curable composition 6 and sealed with the can lid 9. Specific examples include metals such as aluminum, iron, stainless steel, tinplate, and copper, and resins such as polyethylene, polypropylene, polyamide, polyethylene terephthalate, polycarbonate, and polyvinyl chloride.

[0042] A release agent may be applied to the inner peripheral side surface (inner wall surface) of the can body 4 (container body) to provide a release layer. Examples of release agents include natural waxes such as carnauba wax, beeswax, and paraffin wax, polyolefin resins such as polyethylene and polypropylene, stearic acid amide, and silicone or fluorine-based resins. By providing a release layer, the aluminum film 7 adhered to the inner peripheral side surface of the can body 4 (container body) can be easily peeled off.

[0043] The outer peripheral side surface (outer wall surface) of the can body 4 (container body) may be provided with a handle such as a wire handle or a plastic handle to make the can body 4 easier to carry.

[0044] The shape of the can lid 9 is not particularly limited as long as it has a structure that can fit and seal the can body 4 (container body) filled (stored) with the curable composition 6. Specific examples include can lids 9 with a flat top plate having a substantially vertical side surface from the periphery. The can lid 9 may also be provided with a seal 10 on the inner peripheral edge of the side surface of the can lid 9 so that it can fit with the can body 4. In this case, the seal 10 comes into close contact with the outer peripheral side surface (outer wall surface) of the opening of the can body 4 (container body), forming a sealed structure that blocks the inside of the can body 4 from the outside air (moisture in the air).

[0045] The material of the can lid 9 can be the same as the material of the can body 4 (container body). The materials of the can lid 9 and the can body 4 may be the same or different.

[0046] Examples of the moisture prevention film 7 include an aluminum single layer film and an aluminum and resin composite film. An aluminum and resin composite film is preferred because it has a good balance between moisture prevention performance, strength, and elongation. Resins that can be used in the aluminum and resin composite film include low-density polyethylene (LDPE), linear low-density polyethylene (L-LDPE), high-density polyethylene (HDPE), nylon (NY), and polyethylene terephthalate (PET). These can be used alone or in combination of two or more.

[0047] The thickness of the moisture prevention film 7 is not particularly limited, but is preferably 30 to 200 μm, and more preferably 50 to 150 μm. When the moisture prevention film 7 is a composite film of aluminum and resin, the thickness of the aluminum in the composite film is preferably 5 to 50 μm, and more preferably 5 to 40 μm.

[0048] The strength of the moisture prevention film 7 is 20 to 100 N / mm 2 is preferable, and particularly 30 to 80 N / mm 2 In this specification, the strength of the moisture barrier film is the numerical value of the maximum strength measured in a tensile performance test.

[0049] The elongation of the moisture prevention film 7 is preferably 5% or more, more preferably 10 to 50%, and particularly preferably 15 to 50%. In this specification, the elongation of the moisture prevention film is the maximum elongation measured in a tensile performance test.

[0050] The strength and elongation of the moisture-proof film 7 are measured by using the moisture-proof film 7 according to the JIS The strength and elongation of a dumbbell No. 4 specimen, as specified in K 6251 "Tensile test method for vulcanized rubber (1993)", were measured at a speed of 500 mm / min under an environment of 23°C and 50% RH. The thickness of the dumbbell No. 4 specimen was the thickness of the moisture barrier film No. 7.

[0051] When the strength and elongation of the moisture prevention film 7 are within the above ranges, wrinkles are unlikely to occur in the moisture prevention film 7 and voids are unlikely to occur between the curable composition 6 and the moisture prevention film 7 when the moisture prevention film 7 is laid on the surface of the curable composition 6 and pressed with the press plates 18, 28, and 38 to integrate the moisture prevention film 7 and the curable composition 6. In addition, even if the curable composition 6 shrinks in volume due to the outside air temperature after being filled into a container such as a can body 4, the curable composition 6 can easily follow the volume change, and voids can be suppressed from occurring at the periphery of the container.

[0052] Examples of the curable composition 6 include a urethane-based curable composition, a modified silicone-based curable composition, and a polysulfide-based curable composition.

[0053] The urethane-based curable composition is a composition that contains an isocyanate group-containing resin as a curable resin. The isocyanate group-containing resin has one or more isocyanate groups in the resin. It is a resin in which the isocyanate group reacts with active hydrogen (group) to form a urethane bond, urea bond, or the like, and crosslinks and hardens. A suitable example of an isocyanate group-containing resin is an isocyanate group-containing urethane prepolymer. The isocyanate group-containing urethane prepolymer can be produced by reacting an organic isocyanate compound with an active hydrogen-containing compound all at once or successively in a molar ratio of isocyanate group / active hydrogen of preferably 1.2 to 10, more preferably 1.2 to 5.0, so that the isocyanate group remains in the urethane prepolymer.

[0054] The silicone-modified curable composition is a composition that contains a crosslinkable silyl group-containing resin as a curable resin. The crosslinkable silyl group-containing resin is a resin that has one or more crosslinkable (hydrolyzable) silyl groups in the resin, and the crosslinkable silyl groups react with active hydrogen (groups) to form siloxane bonds, which crosslink and cure.

[0055] From the viewpoint of the curability of the modified silicone-based curable composition and the physical properties after curing, the crosslinkable silyl group is preferably at least 1, more preferably 1 to 5, and particularly preferably 1 to 3 in the molecule. Furthermore, the crosslinkable silyl group is preferably one represented by the following general formula, which is easy to crosslink and easy to produce. [ka] (In the formula, R is a hydrocarbon group, preferably an alkyl group having 1 to 20 carbon atoms, an aryl group having 6 to 20 carbon atoms, or an aralkyl group having 7 to 20 carbon atoms, and most preferably a methyl group. The reactive group represented by X is a hydrolyzable group selected from a halogen atom, a hydrogen atom, a hydroxyl group, an alkoxy group, an acyloxy group, a ketoximate group, an amide group, an acid amide group, a mercapto group, an alkenyloxy group, and an aminooxy group, and when there are multiple Xs, they may be the same group or different groups. Of these, Xs are preferably alkoxy groups, and particularly preferably a methoxy group or an ethoxy group. a is an integer of 0, 1, or 2, and particularly preferably 0 or 1.)

[0056] The main chain of the crosslinkable silyl group-containing resin is preferably a polyoxyalkylene polymer, a polyoxyalkylene polymer which may be (meth)acrylic-modified, or a (meth)acrylic copolymer, from the viewpoint of rubber physical properties such as tensile adhesion and modulus after curing.

[0057] In the present invention, the term "may be (meth)acrylic-modified" means a polyoxyalkylene polymer in which a (meth)acrylic monomer is block- or pendant-copolymerized, a polyoxyalkylene polymer in which a (meth)acrylic copolymer is mixed, or a polyoxyalkylene polymer in which a crosslinkable silyl group has been introduced and in which a (meth)acrylic monomer has been polymerized.

[0058] The polysulfide-based curable composition is a composition containing a polysulfide resin as a curable resin. The polysulfide resin is a polymer having a polysulfide skeleton and a mercapto group at the end. As the polysulfide resin having a mercapto group at the end, a structure represented by the general formula: HS-(R' / -Sy)zR"-SH is preferable. In the general formula, y is an integer of 1 to 4, with an average value of 1.5 to 2.5. z is an integer of 1 to 120, preferably 6 to 50. In addition, R' and R" in this general formula are divalent aliphatic hydrocarbon groups, specific examples of which include -C2H4-, -C3H6-, and -C4H8-. In particular, those having an ether bond are preferred, and specific examples thereof include the following: Can be obtained. -C2H4-O-C2H4- -C3H6-O-C3H6- -C4H8-O-C4H8- -C2H4-O-CH2-O-C2H4- -C3H6-O-CH2-O-C3H6- -C4H8-O-CH2-O-C4H8-

[0059] The urethane-based curable composition, the modified silicone-based curable composition, and the polysulfide-based curable composition may further contain additives in addition to the above-mentioned curable resin, if necessary.

[0060] The additives are used to improve various properties of the curable composition, such as viscosity adjustment, curing acceleration, and adhesiveness, by blending with the curable composition. Specific examples of the additives include curing acceleration catalysts, plasticizers, weathering stabilizers, fillers, thixotropy imparting agents, adhesiveness improvers, storage stability improvers (dehydrating agents), colorants, and organic solvents. These can be used alone or in combination of two or more.

[0061] These curable compositions can be broadly classified into one-component curable compositions that are cured mainly by reacting with moisture in the air, and two-component curable compositions that are cured by mixing the main agent with a curing agent and reacting them. The filling method of the present invention can be applied to both one-component curable compositions and two-component curable compositions. The filling method of the present invention includes a step of integrating the moisture prevention film 7 and the curable composition 6 to cover the surface of the curable composition 6 with the moisture prevention film 7 to block the curable composition 6 from moisture in the air, so that the curable composition 6 to be applied is a one-component curable composition and a two-component curable composition containing a resin that reacts with moisture in the air, and therefore has a high storage stability effect.

[0062] The viscosity of the curable composition 6 is preferably 150 to 400 Pa·s, and more preferably 200 to 350 Pa·s, at 1 rpm, as measured with an E-type viscometer (25° C.), and is preferably 40 to 100 Pa·s, and more preferably 50 to 80 Pa·s, at 10 rpm, as measured with an E-type viscometer (25° C.).

[0063] The thixotropic index of the curable composition 6 is preferably 3 to 6, and particularly preferably 3.5 to 5. The thixotropic index of the curable composition 6 can be determined as the viscosity ratio of the curable composition 6 at 1 rpm and 10 rpm (viscosity at 1 rpm / viscosity at 10 rpm) in measurement with an E-type viscometer (25°C, 1 rpm, 10 rpm).

[0064] There are no particular limitations on the seal 10 that can be used as long as it can fit the can body 4 (container body) and the can lid 9 and seal the can body 4 .

[0065] Examples of the material for the seal 10 include natural rubber and synthetic rubber. Examples of synthetic rubber include nitrile rubber, hydrogenated nitrile rubber, fluororubber, urethane rubber, silicone rubber, ethylene propylene rubber, chloroprene rubber, acrylic rubber, butyl rubber, chlorosulfonated polyethylene rubber, and epichlorohydrin rubber.

[0066] The method of fitting the can body 4 (container body) and the can lid 9 has been described using the seal 10 shown in Figures 8 to 11, but fitting can be performed by any conventionally known method other than fitting using the seal 10, and there is no limitation on the method as long as the can body 4 and the can lid 9 can be sealed.

[0067] The desiccant is used to remove moisture (moisture absorption / water) from inside a sealed container such as a can 4. Examples of the desiccant include silica gel, silica alumina gel, calcium oxide, and calcium chloride. [Explanation of symbols]

[0068] 1 Bottom 2. Side 3 handle 4 Can body 5 Filling nozzle 6 Filler (curable composition) 7. Moisture-proof film 9 Can Lids 10 Seal 11 Desiccants 13, 23, 33 Convex 18, 28, 38 Push plate

Claims

[Claim 1] Filling a sealable container with a curable composition; providing a moisture barrier film on the surface of the curable composition; A step of pressing the moisture prevention film with a pressing plate having a convex portion on a bottom surface thereof in a state where the convex portion faces the moisture prevention film, thereby integrating the moisture prevention film and the curable composition; sealing the container with a lid; A method for filling a hardenable composition comprising the steps of:

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