Method for 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 sealants, adhesives, and putties for construction, civil engineering, and automobiles. These curable compositions contain a curable resin, such as an isocyanate group-containing resin or a crosslinkable silyl group-containing resin, blended with additives, such as a curing catalyst, a filler, and a thixotropy-imparting agent. In consideration of their use, the curable compositions are stored in sealed containers, such as cartridges or 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 it from the outside air (moisture), and then the container body and lid are fitted together to seal the container (e.g., Patent Documents 1 and 2). These prior documents disclose methods for insulating 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-blocking film and a sealing surface is formed around the periphery of the film to block moisture. Patent Document 2 describes a method in which the surface of the curable composition is covered with a moisture-blocking film and the periphery of the film is deliberately exposed to moisture in the air to form a cured product with sealing properties, and the moisture-blocking film and cured product block moisture in the air. The methods described in these prior documents are effective for blocking moisture from the curable composition.

[0004] Now, since curable compositions used in sealants, adhesives, putties, etc. are generally thixotropic viscous materials, 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, voids may form 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 voids form between the periphery of the moisture barrier film and the curable composition, voids may form over time, causing the curable composition in the voids to thicken or harden in a ring shape, which requires improvement. [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, an object of the present invention is to provide a method for filling a curable composition, which can prevent the formation of a gap between the filled (stored) curable composition and a moisture prevention film at the peripheral portion of a container, thereby preventing 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 barrier film on the surface of the curable composition, pressing the curable composition with a pressure plate having a convex portion on its bottom surface to integrate the moisture barrier film and the curable composition, and sealing the container with a lid, can prevent the formation of voids between the filled (stored) curable composition and the moisture barrier film at the periphery of the container. That is, the present invention has the following aspects (1) to (14).

[0008] (1) filling a sealable container with a curable composition; applying a moisture barrier film to the surface of the curable composition; a step of pressing the moisture barrier film with a press plate having a convex portion on its bottom surface, with the convex portion facing the moisture barrier film, to integrate the moisture barrier 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 in a side view over the entire bottom surface. (3) A filling method described in (1), wherein the convex portion has a curved area that is arc-shaped in a side view formed on the periphery of the bottom surface, and a flat area that is linear in a side view formed from the periphery of the bottom surface to the center, 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 a side view and formed on the periphery of the bottom surface, and a second curved surface region that is arc-shaped in a side view and that is formed from the periphery of the bottom surface to the center, continuous with the first curved surface region, and has a radius of curvature that is larger than the radius of curvature of the first curved surface region that is arc-shaped in a 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 at the bottom, an opening is provided at the top of the container, and the container becomes sealable when the opening and the lid are fitted together. (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), wherein: (8) The filling method 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-proof film and the curable composition integrates the moisture-proof film and the curable composition, thereby insulating the curable composition from moisture, and the moisture-proof film is adhered in whole or in part to the inner circumferential surface of the sealable container. (13) The filling method according to any one of (1) to (12), characterized in that the moisture prevention film and the curable composition are integrated by the step of integrating the moisture prevention film and the curable composition, the curable composition is shielded 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. [Effects of the Invention]

[0010] The method for filling a curable composition of the present invention can prevent the formation of voids between the filled (stored) curable composition and the moisture barrier film at the periphery of the container, thereby preventing 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 explanation of the drawings]

[0011] [Figure 1] FIG. 1 is a side cross-sectional view of a pressure plate according to a first embodiment of the present invention, which is used in a method for filling a curable composition. [Figure 2] FIG. 2 is a side cross-sectional view of a presser plate according to a second embodiment of the present invention, which is used in the method for filling a curable composition. [Figure 3] FIG. 3 is a side cross-sectional view of a presser plate according to a third embodiment of the present invention, which is used in the method for filling a curable composition. [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. [Figure 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. 2 is a cross-sectional side view showing step 4 of the method for filling the curable composition of the present invention. [Figure 8] FIG. 2 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 curable composition filled by a method for filling a curable composition of the present invention using a pressing plate according to a first embodiment. FIG. [Figure 10] FIG. 10 is a cross-sectional side view showing the sealed structure of the curable composition filled by the method for filling a curable composition of the present invention using a pressure plate according to a second embodiment. [Figure 11] FIG. 10 is a cross-sectional side view showing the sealed structure of the curable composition filled by the method for filling a curable composition of the present invention using a pressure plate according to a third embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0012] First, a presser plate having a convex portion on its bottom surface used in the method for filling a curable composition of the present invention will be described with reference to Figures 1 to 3. The presser plate having a convex portion on its bottom surface shown in Figures 1 to 3 is used to fill (store) a sealable container with a curable composition, lay a moisture-proof film on its surface, and then press the moisture-proof film with the presser plate to integrate it with the curable composition, thereby covering the surface of the curable composition with the moisture-proof film and insulating the curable composition from moisture in the air. In this specification, "insulating from moisture by a moisture-proof film" means that the moisture-proof film completely prevents moisture from passing through, or that even if moisture does pass through, the curable composition is prevented from significantly thickening or curing.

[0013] First, the presser plate according to the first embodiment will be described. Fig. 1 is a side cross-sectional view of the presser plate according to the first embodiment used in the method for filling a curable composition of the present invention. As shown in Fig. 1, the presser 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 protrusion 13 that protrudes in the opposite direction from the top surface 12. As will be described later, the protrusion 13 of the presser plate 18 is placed opposite a moisture barrier film (not shown in Fig. 1), and the presser plate 18 presses against the moisture barrier film.

[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 has a substantially convex arc shape (curved shape) from its center 15 toward its 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. As described above, the center 15 of the bottom surface 1 protrudes the most. 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 top surface 12 facing the bottom surface 1 is not particularly limited, but in the case of the pusher plate 18, the entire top surface 12 is flat. A handle 3 is provided in the center of the top surface 12, which the worker grasps when carrying the pusher plate 18 to the moisture barrier film inside the container, pressing the moisture barrier film, and removing the pusher plate 18 from the moisture barrier film. The handle 3 improves the convenience of the above operations.

[0016] As shown in Fig. 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, extending from the outer peripheral edge 16 of the bottom surface 1 toward the top surface 12.

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

[0018] In the push 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 push 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 region 21 formed on the peripheral edge 26 of the bottom surface 1 and having an arc shape in a side view, and a flat region 22 formed in a linear shape in a side view from the peripheral edge 26 of the bottom surface 1, which is continuous with the curved surface region 21, extending from the central portion 25. In the push plate 28, only the curved surface region 21 is a curved surface portion. Therefore, in the push plate 28, only the peripheral edge 26 of the bottom surface 1 is a curved surface portion, and only the peripheral edge 16 of the bottom surface 1 is arc-shaped (curved). The curved surface region 21 forms the convex portion 23 on the bottom surface 1. The radius of curvature of the peripheral edge 26, which is arc-shaped 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 10 to 26 mm, for example.

[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 flat. As described above, bottom surface 1 has a generally convex shape extending from center 25 toward peripheral edge 26. The range of curved region 21 is not particularly limited, but has an area of ​​10% to 50% of the overall area of ​​bottom surface 1, for example.

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

[0021] In the push 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 over 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 push 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 an arc shape in a side view, and a second curved surface region 32 formed from the periphery 36 of the bottom surface 1, continuing from the first curved surface region 31, to the center 35, and having a radius of curvature larger than that 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 push 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 center 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. The radius of curvature of the second curved surface region 32, which is arc-shaped in side view, is also substantially the same throughout the second curved surface region 32. As described above, the push plate 38 also has a configuration in which the center 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, for example, 10 to 26 mm. The radius of curvature of the second curved surface region 32, which is arc-shaped in side view, 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 area of ​​the entire 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 pressure 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., 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 pressure plates 18, 28, 38 press the curable composition and the moisture barrier film together.

[0026] There are no particular restrictions on the material of the presser plates 18, 28, and 38, as long as it is possible to press the moisture barrier film, integrate the moisture barrier film with the curable composition, and cover the surface of the curable composition with the moisture barrier film. Examples of materials for the presser plates 18, 28, and 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 one example, and the present invention is not interpreted as being limited to this procedure. Also, for the sake of convenience, the description will be given using the press plate 18 according to the first embodiment as the press plate.

[0028] Step 1 of the method for filling the curable composition 4 shows a side cross-sectional view of the concept of installing a filling nozzle 5 capable of discharging a curable composition 6 inside a sealable can body 4 (container body). The filling nozzle 5 is preferably installed at the center of the bottom 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 unevenness inside the can body 4. The can body 4 can be 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 the method for filling the curable 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) on 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. Alternatively, 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 the method for filling the curable composition 6 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 laying a moisture barrier film 7 on the surface of the curable composition 6. The moisture barrier film 7 is laid so that the (planar) center of the moisture barrier film 7 coincides with the center of the bottom surface of the can body 4. The size of the moisture barrier 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 curable composition FIG. 7 shows a cross-sectional side view of a concept in which a sealable can body 4 (container body) is filled with (stored in) a curable composition 6, and a moisture barrier film 7 laid on the surface of the curable composition 6 and the curable composition 6 are pressed with a pressure plate 18 to integrate the moisture barrier film 7 and the curable composition 6. The pressure plate 18 is pressed against the moisture barrier film 7 with the protrusion 13 of the pressure plate 18 facing the moisture barrier film 7. It is preferable that the pressure plate 18 be pressed carefully so as not to create any gaps between the moisture barrier film 7 and the curable composition 6. As shown in FIG. 7, if the size of the moisture barrier film 7 is larger than the inner diameter of the can body 4, the moisture barrier film 7 will bend along the side surface 2 of the pressure plate 18 when pressed with the pressure plate 18, and the moisture barrier film 7 will be in full or partial contact with the inner circumferential surface of the can body 4. When the moisture barrier film 7 is in close contact with the inner circumferential 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 barrier film 7 is pressed with the pressure plate 18, it is preferable to bring the folded moisture barrier film 7 into contact with the inner circumferential surface of the can body 4 using the side surface 2 of the pressure plate 18, thereby bringing the moisture barrier film 7 into close contact with the inner circumferential surface of the can body 4. Furthermore, if the adhesion between the folded moisture barrier film 7 and the inner circumferential surface of the can body 4 is insufficient after the moisture barrier film 7 is pressed with the pressure plate 18, it is preferable to bring the moisture barrier film 7 into close contact with the inner circumferential surface of the can body 4 using a tool such as a finger or a spatula.

[0032] If it is difficult to adhere the moisture barrier film 7 to the inner periphery of the can body 4, a liquid material can be placed between the moisture barrier film 7 and the inner periphery of the can body 4 to a degree that will block moisture in the air. The liquid material is preferably a compound that does not react with the curable composition 6 or water, such as moisture. Examples of liquid materials include plasticizers such as phthalates and adipates, 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 isocyanates or carboxylic acids to form urethanes or esters. Alternatively, these plasticizers or resins may be blended with heavy calcium carbonate, fatty acid-treated calcium carbonate, finely powdered silica, or the like, and mixed uniformly to form a paste. The number-average molecular weight in this specification is a polystyrene-equivalent value measured by gel permeation chromatography (GPC).

[0033] Step 5 of the method for filling the curable composition FIG. 8 shows a cross-sectional side view of the concept of filling (storing) a sealable can body 4 (container body) with a curable composition 6, and fitting the can body 4 (container body) with a can lid 9 equipped with a seal 10. The moisture barrier film 7 laid on the surface of the curable composition 6 and the curable composition 6 are pressed with a pressure plate 18 to unite the moisture barrier film 7 and the curable composition 6, and then the pressure plate 18 is removed from the moisture barrier film 7, and the can lid 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 (including moisture) in the can body 4.

[0034] Fig. 9 is an example of a side cross-sectional view showing a sealed structure for a curable composition 6 filled by the filling method of the present invention. The sealed structure of Fig. 9 uses the press plate 18 according to the first embodiment shown in Fig. 1. In Fig. 9, the surface of the curable composition 6 and moisture barrier film 7, which are pressed together 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 generally convex arc shape facing the bottom surface of the can body 4. A desiccant 11 is placed on the moisture barrier film 7 for the purpose of removing moisture from the air.

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

[0036] Fig. 11 is an example of a side cross-sectional view showing the sealed structure of the curable composition 6 filled by the filling method of the present invention. Fig. 11 uses the press plate 38 according to the third embodiment shown in Fig. 3. In Fig. 11, the surface of the curable composition 6 and the moisture barrier film 7 that are pressed together by the press plate 38 and that faces the can lid 9 has a shape that corresponds to the shape of the protrusion 33 of the press 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 edge of the can body 4. Preventing the occurrence of voids prevents the generation of thickened or hardened products of the curable composition around the voids, thereby improving the storage stability of the curable composition filled (stored) in the container.

[0038] The mechanism by which voids occur between the curable composition and the moisture barrier film at the periphery of the can (container body) is presumed to be as follows: The curable composition filled (stored) in the can is often kept at a temperature higher than the ambient temperature of the filling work area to ensure fluidity during filling. After the curable composition is filled and the can is sealed with a can lid, the curable composition cools from the periphery of the can and undergoes volumetric shrinkage. If the moisture barrier film integrated with the curable composition cannot keep up with the volumetric shrinkage of the curable composition, voids are likely to occur between the curable composition and the moisture barrier film at the periphery of the can. One method to prevent voids from occurring is to soften the moisture barrier film, but softening the moisture barrier film can lead to poor handling when laying it on the surface of the curable composition and wrinkles when pressed with a pressure plate. Furthermore, reducing the thickness of the moisture barrier film to soften it is undesirable because it reduces the moisture barrier performance of the film.

[0039] In contrast, when the curable composition filling method of the present invention is used, the integrated curable composition and moisture prevention film have a shape with a convex portion facing 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 from occurring around the peripheral portion of the can body 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 thereof include a cylindrical, elliptical, or rectangular cylindrical shape in which the lower part of the can body 4 is a bottom surface (has a bottom surface) and the upper part (ceiling surface) of the can body 4 is open, 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 shielded 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 circumferential surface (inner wall surface) of the can body 4 (container body) to form 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 circumferential 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 loop or a plastic loop 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 with the can body 4 (container body) filled (stored) with the curable composition 6. Specific examples include can lids 9 with a flat top plate and side surfaces that extend approximately vertically 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 can lid 9 may be made of the same material as the can body 4 (container body). The can lid 9 and the can body 4 may be made of the same material or different materials.

[0046] Examples of the moisture-proof film 7 include a single-layer aluminum film and an aluminum and resin composite film. Aluminum and resin composite films are preferred because they offer a good balance of moisture-proofing performance, strength, and elongation. Resins that can be used in aluminum and resin composite films 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 barrier film 7 is not particularly limited, but is preferably 30 to 200 μm, and more preferably 50 to 150 μm. When the moisture barrier 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 The strength of the moisture barrier film in this specification is the numerical value of the maximum strength measured in a tensile performance test.

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

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

[0051] When the strength and elongation of the moisture barrier film 7 are within the above ranges, wrinkles are less likely to occur in the moisture barrier film 7 when the moisture barrier film 7 is laid on the surface of the curable composition 6 and pressed with the pressure plates 18, 28, and 38 to integrate the moisture barrier film 7 and the curable composition 6, and voids are less likely to occur between the curable composition 6 and the moisture barrier film 7. Furthermore, even if the curable composition 6 shrinks in volume due to the outside temperature after being filled into a container such as a can body 4, the moisture barrier film 7 can easily follow the volume change, and voids can be prevented from occurring around 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 containing an isocyanate group-containing resin as a curable resin. The isocyanate group-containing resin is a resin having one or more isocyanate groups therein, and the isocyanate groups react with active hydrogen (groups) to form urethane bonds, urea bonds, etc., thereby crosslinking and curing. A suitable example of the 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 such a manner that the molar ratio of isocyanate group / active hydrogen is preferably 1.2 to 10, more preferably 1.2 to 5.0, so that isocyanate groups remain in the urethane prepolymer.

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

[0055] From the viewpoint of the curability of the modified silicone-based curable composition and its post-curing physical properties, the crosslinkable silyl group contained in the molecule is preferably at least one, more preferably 1 to 5, and particularly preferably 1 to 3. Furthermore, the crosslinkable silyl group is preferably one represented by the following general formula, which is easy to crosslink and to prepare. [ka] (In the formula, R represents 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, with a methyl group being most preferred. 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 or different groups. Of these, X is preferably an alkoxy group, with a methoxy group or an ethoxy group being particularly preferred. a represents an integer of 0, 1, or 2, with 0 or 1 being particularly preferred.)

[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] A polysulfide-based curable composition is a composition containing a polysulfide resin as a curable resin. A polysulfide resin is a polymer having a polysulfide backbone and a terminal mercapto group. A polysulfide resin having a terminal mercapto group is preferably one having a structure represented by the general formula: HS-(R' / -Sy)zR"-SH. In this general formula, y is an integer of 1 to 4, with an average value of 1.5 to 2.5. z is 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, one having an ether bond is preferred, and specific examples thereof include the following: -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, modified silicone-based curable composition, and polysulfide-based curable composition may further contain additives in addition to the above-mentioned curable resin, if necessary.

[0060] Additives are blended into the curable composition to improve various properties of the curable composition, such as viscosity adjustment, cure acceleration, and adhesiveness. Specific examples include cure-accelerating catalysts, plasticizers, weather stabilizers, fillers, thixotropic agents, adhesion improvers, storage stability improvers (dehydrating agents), colorants, and organic solvents. These may be used alone or in combination of two or more.

[0061] These curable compositions can be broadly classified into one-component curable compositions that cure primarily by reacting with moisture in the air, and two-component curable compositions that cure by mixing a base compound with a curing agent and allowing the mixture to react. 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 a moisture barrier film 7 and the curable composition 6 to cover the surface of the curable composition 6 with the moisture barrier film 7, thereby insulating the curable composition 6 from moisture in the air. Therefore, the curable composition 6 to be applied is one-component curable compositions and two-component curable compositions containing a resin that reacts with moisture in the air, which 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 when 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 when 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 together and seal the can body 4 tightly.

[0065] Examples of materials 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 for fitting the can body 4 (container body) and the can lid 9 has been explained using the seal 10 shown in Figures 8 to 11, but fitting can also be done using conventionally known methods other than fitting using the seal 10, and there are no restrictions 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 absorption) from inside a container such as the sealed can body 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 Seals 11 Desiccant 13, 23, 33 convex parts 18, 28, 38 Push Plate

Claims

1. filling a sealable container with a curable composition; applying a moisture barrier film to the surface of the curable composition; a step of pressing the moisture barrier film with a press plate having a convex portion on its bottom surface, with the convex portion facing the moisture barrier film, to integrate the moisture barrier film and the curable composition; sealing the container with a lid; Including, The moisture-proof film is a composite film of aluminum and resin, and the thickness of the moisture-proof film is 30 to 200 μm; A method for filling a curable composition, in which the moisture prevention film and the curable composition are integrated by the step of integrating the moisture prevention film and the curable composition, the curable composition is isolated from moisture, the moisture prevention film and the curable composition become convex toward the bottom surface of the container, and the moisture prevention film is adhered in whole or in part to the inner circumferential side surface of the sealable container.

2. The filling method according to claim 1 , wherein the convex portion is a curved portion formed in an arc shape in a side view over the entire bottom surface.

3. The filling method according to claim 1, wherein the convex portion has a curved area that is arc-shaped in a side view formed on the periphery of the bottom surface, and a linear flat area that is continuous with the curved area and extends from the periphery of the bottom surface to the center.

4. 2. The filling method according to claim 1, wherein the convex portion has a first curved surface region that is arc-shaped in a side view and formed on the periphery of the bottom surface, and a second curved surface region that is arc-shaped in a side view and that is formed from the periphery of the bottom surface to the center, continuous with the first curved surface region, and has a radius of curvature that is larger than the radius of curvature of the first curved surface region that is arc-shaped in a side view.

5. The filling method according to any one of claims 1 to 4, wherein the sealable container has a cylindrical, elliptical or rectangular cylindrical shape with a bottom at the bottom, an opening is provided at the top of the container, and the container becomes sealable by fitting a lid into the opening.

6. The strength of the moisture barrier film measured by a tensile performance test is 20 to 100 N / mm ２ The filling method according to any one of claims 1 to 5, wherein

7. 7. The method for filling according to claim 1, wherein the moisture barrier film has an elongation of 5% or more as measured by a tensile performance test.

8. 8. The filling method according to claim 1, wherein the viscosity of the curable composition at 25° C. measured at 1 rpm using an E-type viscometer is 150 to 400 Pa·s.

9. The filling method according to any one of claims 1 to 8, wherein the curable composition has a thixotropic index of 3 to 6 at 25°C measured at 1 rpm / 10 rpm using an E-type viscometer.

10. A method for producing a structure, comprising filling the curable composition into a sealable container by the filling method according to any one of claims 1 to 9, and sealing the container with the lid.

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