Method for manufacturing seal body, and seal body

Abstract

This method 1 for manufacturing a seal body comprises: a belt-shaped body formation step provided with a cross-linking agent addition step S1 for adding a cross-linking agent 3 to a compound 2 containing a halogen-group-containing monomer as a structural unit then mixing the agent and the compound together, a kneading step S2 for kneading the resultant mixture 4, a pressurizing step S3 for pressurizing the kneaded product 5, and a cutting step S4 for cutting the pressurized body 6 into a belt-shaped body 7; and a pressure-bonding step provided with a pressure-bonding and heating step S5 in which one end portion and the other end portion of the belt-shaped body 7 are pressure-bonded to one another to form an endless seal body 8.

Description

[Technical field]

[0001] The present invention relates to a method for manufacturing a seal body, and a seal body. More specifically, the present invention relates to a method for manufacturing an endless (or annular) seal body that has a self-repairing function and can be manufactured without a molding step using a molding die, and a seal body that can be manufactured using the manufacturing method. [Background technology]

[0002] Conventionally, in order to prevent leakage of liquids such as water or oil, or fluids such as gas, or to prevent the intrusion of foreign matter such as dust or dirt from the outside, an endless seal such as an O-ring or a component called a sealing device has been fitted into an annular groove (annular groove) provided on one of two components that face each other and are fastened to each other, such as a shaft and a bearing.

[0003] By installing such a sealing body, it becomes possible to physically block the gap (crevice) formed between the two components, thereby preventing the intrusion of fluids and impurities into the gap, and creating a sealed structure that regulates the flow of fluids, etc. between the two components.

[0004] The seal is mainly made of a rubber-like elastic body such as elastically deformable hard rubber, and is mainly manufactured by pouring a raw material of the rubber-like elastic body having fluidity into a cavity of a molding die engraved in advance into a predetermined shape, hardening the raw material by cooling or the like in the molding die, and then removing the raw material from the molding die (see, for example, Patent Document 1). The seal obtained in this way has elasticity and repulsive force due to the raw material rubber-like elastic body, which makes it possible to seal between two members. Note that in order to construct a sealing structure, many seals are manufactured that are annular, in other words, endless, like the above-mentioned O-ring.

[0005] To explain more specifically about a manufacturing method for annular sealing bodies such as O-rings, Patent Document 1 mentioned above discloses an O-ring molding die for forming annular O-rings, which has a pair of dies (upper and lower dies) of identical shapes that are symmetrical about a parting line, and the upper and lower dies are overlapped while being aligned with each other, and annular molding recesses are provided on the molding surfaces of the upper and lower dies respectively, which can form a flat, annular O-ring vulcanization molding space when the dies are clamped. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2002-264004 A Summary of the Invention [Problem to be solved by the invention]

[0007] As described above, in the case of a general seal body, a molding die (e.g., a molding metal mold) is used to process the seal body into a predetermined shape, and therefore manufacturing costs may be required to manufacture the molding die, etc. In addition, in the case of a general annular seal body, a mounting groove for mounting the seal body needs to be formed in advance on the housing side to which the seal body is to be attached, and a processing step is required to provide such a mounting groove, which may increase the number of work steps and require additional processing costs to provide the mounting groove.

[0008] In addition, since the sealing structure is constructed using the reaction force of the sealing body, etc., depending on the size and shape of the sealing body, there is a possibility that the housing itself will be subjected to stress, which may result in defects such as deformation of the housing or the mounting groove formed in the housing.

[0009] Here, as an example of a seal body or a sealing device, the above description mainly uses a solid seal body, but the seal body is not limited to this, and for example, a sealing structure is also constructed using a liquid gasket called a "liquid gasket."

[0010] However, in the case of a liquid gasket, it is necessary to apply a liquid substance to the surface to be processed where two components that form a sealed structure overlap, and the liquid gasket formation work can be time-consuming as the liquid substance may overflow or flow out of the surface to be processed during application. In addition, after the liquid substance is applied, a lot of time is required for the liquid gasket to become effective, which can lengthen the work time, and there can be problems such as the liquid gasket becoming difficult to remove once it has hardened.

[0011] In view of the above-mentioned circumstances, the present invention has an object to provide a method for manufacturing an endless (annular) sealing body that has excellent attachment properties, is capable of reducing manufacturing and processing costs, and does not place excessive load on the housing in which it is installed, and a sealing body manufactured using this manufacturing method. [Means for solving the problem]

[0012] According to the present invention, a method for manufacturing a seal body that solves the above problems and a seal body are provided as described below.

[0013] [1] A method for producing a sealed body using a compound containing a halogen group-containing monomer as a constituent unit as a main raw material, the method comprising: a band-shaped body forming step of adding a crosslinking agent to the compound and forming a band-shaped body from the resulting mixture; and a pressure-bonding step of bonding one end and the other end of the band-shaped body obtained in the band-shaped body forming step together to form an endless sealed body. In the strip-shaped body forming step, the crosslinking agent is added so that the molar equivalent of the crosslinking agent relative to the halogen group of the halogen-containing monomer contained in the compound is in the range of 0.2 to 4.0. A method for manufacturing a seal body.

[0014] [2] A method for producing a sealed body using a compound containing a halogen group-containing monomer as a constituent unit as a main raw material includes a band-shaped body forming step of adding a crosslinking agent to the compound and forming a band-shaped body from the resulting mixture, and a pressure-bonding step of bonding one end and the other end of the band-shaped body obtained in the band-shaped body forming step together to form an endless sealed body, the band-shaped body forming step including a two-stage kneading step of a mill kneading step using a mill kneader that kneads the mixture using rotor blades, and a roll kneading step using a roll kneader that kneads the mill-kneaded product obtained in the mill kneading step between a plurality of rolls. A method for manufacturing a seal body.

[0016] [ 3The kneading conditions in the kneading step are that the rotation speed of the rotor blade of the mill kneader performing the mill kneading step is in the range of 5 rpm to 20 rpm, the kneading temperature is in the range of 30°C to 70°C, and the kneading time is in the range of 30 minutes to 60 minutes, and the rotation speed of the roll of the roll kneader performing the roll kneading step is in the range of 7 rpm to 20 rpm, the kneading temperature is in the range of 30°C to 80°C, and the kneading time is in the range of 10 minutes to 30 minutes. 2

[0023] A method for producing the seal body described in the above.

[0017] [ 4 The band-shaped body forming step includes a pressing step of pressing the material with a press machine, and the pressing conditions of the pressing step are that the pressing pressure of the press machine is 95 to 105 kgf / cm 2 [1] wherein the pressing temperature is 150°C, the pressing time is 1 hour, and the thickness of the pressed body after pressing is adjusted to 2 mm. or [2] A method for manufacturing the seal body according to claim 1.

[0018] [ 5 The pressure-bonding step further includes a pressure-bonding heating step of heating the strip-shaped body at 100° C. for 24 hours in air after the strip-shaped body is pressure-bonded to the one end and the other end of the strip. or [2] A method for manufacturing the seal body according to claim 1. Effect of the Invention

[0027] According to the method for producing a seal body of the present invention, a compound such as acrylic rubber containing a halogen-containing monomer is used as a main raw material, and one end and the other end of a strip formed in a strip-shaped body forming process are pressed together to form an endless seal body. This makes it unnecessary to use a conventional molding die, and an endless (annular) seal body can be easily formed while reducing manufacturing costs. Furthermore, the obtained seal body has a self-repairing function, which provides excellent mounting properties and prevents excessive load from being applied to the housing. [Brief description of the drawings]

[0028] [Figure 1]5A to 5C are explanatory diagrams illustrating a flow of a method for manufacturing a seal body according to one embodiment of the present invention. [Diagram 2] FIG. 2 is an explanatory diagram showing a schematic configuration of (a) a pressure body, (b) a strip, and (c) the ends of the strip pressed together, and an endless sealed body. [Diagram 3] FIG. 2 is an explanatory diagram showing the schematic configuration of (a) a test piece for a tensile test, (b) a test piece, and (c) a measurement sample for evaluating a self-repair function. [Figure 4] FIG. 2 is an explanatory diagram showing a schematic configuration for preparing a measurement sample for evaluation of adhesiveness and peelability. [Diagram 5] FIG. 2 is an explanatory diagram showing a schematic configuration of a water submersion test fixture. [Figure 6] FIG. 2 is an explanatory diagram showing a schematic configuration of a water resistance measurement sample. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0029] Hereinafter, the seal body manufacturing method and the seal body according to the present invention will be described in detail with reference to the drawings. Note that the seal body manufacturing method and the seal body according to the embodiments of the present invention are not limited to those shown below, and various design changes, modifications, improvements, etc. can be made without departing from the gist of the present invention.

[0030] 1. Manufacturing method of seal body As shown in Figures 1 to 6, a manufacturing method 1 for a sealed body according to one embodiment of the present invention uses a compound 2 containing a halogen group-containing monomer as a structural unit as a main raw material, and is mainly composed of a strip-shaped body formation process in which a crosslinking agent 3 is added to the compound 2 to form a strip-shaped body 7 from the resulting mixture 4, and a compression process S5 in which one end 7a and the other end 7b of the strip-shaped body 7 obtained in the strip-shaped body formation process are compressed together to form an endless sealed body 8.

[0031] The compound 2, which is the main raw material of the seal body 8, contains, for example, an acrylic monomer-derived structural unit (acrylic monomer-derived structural unit) derived from an acrylic monomer and a halogen group-containing monomer-derived structural unit (halogen group-containing monomer-derived structural unit) derived from a halogen group-containing monomer, and an acrylic rubber or the like that is composed of these structural units each contained as a repeating unit can be used. Furthermore, as the acrylic monomer (acrylic monomer-derived structural unit), for example, ethyl acrylate, butyl acrylate, methoxyethyl acrylate, etc. can be used, while as the halogen group-containing monomer (halogen group-containing monomer-derived structural unit), for example, 2-chloroethyl vinyl monomer such as 2-chloroethyl vinyl ether can be used. Note that, as the halogen group in the halogen group-containing monomer, a fluorine group, a butyl group, an iodine group, etc. may be used in addition to the above-mentioned chlorine group.

[0032] The strip-shaped body forming process in the method for producing a seal body 1 of this embodiment includes a crosslinking agent adding process S1 in which a predetermined amount of crosslinking agent 3 is added to compound 2, which is a main raw material containing the above-mentioned halogen group-containing monomer, and the acrylic rubber 2 and crosslinking agent 3 are uniformly mixed using a well-known stirrer or the like (not shown) to form a mixture 4. Here, as the crosslinking agent 3, for example, an imidazole compound such as 1-butylimidazole can be added and used. In other words, any crosslinking agent 3 can be used as long as it can be added to compound 2 such as acrylic rubber and mixed uniformly, and can cause a crosslinking reaction between compound 2 and the crosslinking agent 3.

[0033] Here, the amount of the crosslinking agent 3 added relative to the compound 2 in the crosslinking agent addition step S1 can be specified based on the following: That is, the molar equivalent of the crosslinking agent 3 relative to the halogen group of the halogen group-containing monomer contained in the acrylic rubber 2 can be in the range of 0.2 to 4.0.

[0034] When the range of molar equivalents is converted into mol%, the amount of the crosslinking agent 3 added can be in the range of 0.8 mol% to 4.2 mol% relative to the amount of the acrylic rubber 2 added. By adding the crosslinking agent 3 in the molar equivalents (or mol%) specified as above, the compound 2 can promote a good crosslinking reaction.

[0035] The strip-shaped body forming step in the method for producing a seal body 1 of this embodiment includes a kneading step S2 in which a mixture 4 obtained by adding a specified amount of crosslinking agent 3 in the crosslinking agent adding step S1, stirring the crosslinking agent 3 with the acrylic rubber 2, and mixing the mixture 4 to be uniform is further kneaded. Here, the kneading step S2 can be performed using a well-known kneading machine, and is not particularly limited, and is for kneading the mixture 4 and adjusting it to a predetermined viscosity.

[0036] For example, a mill mixer (not shown) can be used that uses a rotor blade connected to a drive motor and mixes the mixture 4 by rotating the rotor blade, or a roll mixer (not shown) can be used that kneads the mixture 4 between multiple rolls.

[0037] In addition, the kneading step S2 can be carried out in two steps using the mill kneader and roll kneader described above as kneaders. To be more specific, the mixture 4 obtained in the crosslinking agent addition step S1 is kneaded in the first step using a mill kneader as a kneader in the mill kneading step S2a, and the mill kneaded product 5a obtained in the mill kneading step S2a is kneaded in the second step using a roll kneader as a kneader in the roll kneading step S2b. The kneading step S2 is not limited to the above, and only one of the mill kneading step S2a and the roll kneading step S2b may be carried out, or the roll kneading step S2b may be carried out before the mill kneading step S2a.

[0038] Here, the kneading conditions for mixture 4 in the kneading step S2 are not particularly limited, and for example, the rotor blade rotation speed of the mill kneader performing the mill kneading step S2a can be set to a range of 5 rpm to 20 rpm, the kneading temperature can be set to a range of 30°C to 70°C, and the kneading time can be set to a range of 30 minutes to 60 minutes, and the roll kneader performing the roll kneading step S2b can be set to a roll rotation speed of 7 rpm to 20 rpm, the kneading temperature can be set to a range of 30°C to 80°C, and the kneading time can be set to a range of 10 minutes to 30 minutes.

[0039] By carrying out kneading in this manner through the above-mentioned kneading process S2 (mill kneading process S2a, roll kneading process S2b), the mixture 4 sent to the kneading process S2 is adjusted to a substance having suitable properties such as viscosity and fluidity for carrying out the next process.

[0040] The strip-shaped body forming step in the manufacturing method 1 of the sealed body of this embodiment includes a pressurizing step S3 in which the kneaded material 5 obtained in the kneading step S2 is pressed using a press. A known press can be used in the pressurizing step S3, and by applying pressure while heating at a predetermined pressurizing pressure, the kneaded material 5, for example, delivered from the kneading step S2 in the form of a block can be thinly stretched to a predetermined thickness to form a thin plate-like pressurized body 6 (see FIG. 2(a)). Note that FIG. 2(a) shows a cut product in a substantially square shape, but is not limited thereto.

[0041] The pressing conditions of the press machine in the pressing step S3 are not particularly limited, but for example, the pressing pressure is 95 to 105 kgf / cm 2 By pressing in a known press mold at a pressing temperature of 150°C and a pressing time of 1 hour, it is possible to form a pressed body 6 whose thickness t after pressing is adjusted to 2 mm.

[0042] The strip-shaped body forming step in the method for producing a seal body 1 of this embodiment includes a cutting step S4 in which the thin plate-shaped pressurized body 6 pressed to a uniform thickness t (for example, 2 mm) by the pressurizing step S3 is further cut into a strip-shaped body 7 (see FIG. 2(b)). The cutting step S4 is not particularly limited as long as it can cut the thin plate-shaped pressurized body 6 into a strip-shaped body 7 (in other words, an elongated shape) of a predetermined width, and may be, for example, cut using a known cutting means (cutter) or the like, or may be formed by punching using a mold that matches the shape of the strip-shaped body 7. This allows the strip-shaped body 7 to finally be formed into an elongated (or strip-shaped) body of a predetermined width having a longitudinal direction and a lateral direction.

[0043] In addition, since it is a strip-shaped body 7, it has one end 7a and the other end 7b at both ends in the longitudinal direction. That is, the cutting step S4 forms a strip-shaped body 7 having a pair of ends 7a, 7b.

[0044] The method 1 for manufacturing a seal body of this embodiment further includes a crimping step of crimping one end 7a and the other end 7b of a strip 7 of a predetermined width formed through the strip-shaped body forming step together (see FIG. 2(c)). As a result, one end 7a and the other end 7b of the aforementioned strip 7 with ends are crimped together and integrated, the ends 7a and 7b disappear, and an endless (annular) seal body 8 is formed (see FIG. 2(d)).

[0045] Furthermore, in the compression bonding step, the strip 7 is deformed in a predetermined direction (the direction of the arrow in FIG. 2(c)) so that one end 7a and the other end 7b of the strip 7 are brought close to each other, and compression bonding is performed in this deformed state. As described above, the strip 7 is made mainly of compound 2 such as acrylic rubber that has been subjected to the kneading step S2 and the pressurizing step S3 included in the strip formation step, and has the property of being freely deformable as described above.

[0046] The pressure bonding step in the method for producing a sealed body of this embodiment may further include a pressure bonding and heating step in which one end 7a and the other end 7b of the strip 7 are held after being pressure bonded together and heated in air at a temperature of 100° C. for 24 hours. This allows the crosslinking reaction of the compound 2 constituting the strip 7 to proceed, and the ends 7a, 7b are integrated together to obtain an endless sealed body 8.

[0047] As described above, the method 1 for producing a seal body according to the present embodiment uses a compound 2 such as an acrylic rubber containing a halogen-containing monomer as a constituent unit as a main raw material, and after forming the compound into a strip shape, the ends 7a, 7b are joined together to form a ring-shaped (endless) seal body 8 by utilizing the self-repairing function. Therefore, unlike the conventional method for producing a seal body, a molding die is not required, and it is possible to reduce the manufacturing cost for such a molding die. In addition, an excessive burden is not placed on the housing to which the seal body 8 is attached, and a processing step for providing a groove or the like in the housing can be omitted.

[0048] Furthermore, compared to conventionally used liquid gaskets, the sealing body 8 itself is a solid, so it does not flow out from the mounting site after mounting to the housing, and has the advantage of being easier to handle than a liquid gasket. In addition, it can be mounted to the housing in a shorter time than a liquid gasket, and can be easily removed even after mounting.

[0049] Furthermore, the seal body 8 manufactured by the seal body manufacturing method 1 of this embodiment has the following characteristics: a self-repair rate (details will be described later) of 50% or more, an adhesive strength to acrylonitrile-butadiene rubber (NBR) of 0.30 N / mm or more and 0.70 N / mm or less, an adhesive strength to nylon of 0.30 N / mm or more and 0.50 N / mm or less, an adhesive strength to aluminum of 0.10 N / mm or more and 0.40 N / mm or less, and a reaction force at 40% contraction of 200 N or less. Furthermore, it has water resistance equivalent to IPX7. EXAMPLES

[0050] The present invention will be described in detail below based on examples. However, the present invention is not limited to these examples, and it goes without saying that the present invention can be embodied in various forms as long as it falls within the technical scope of the present invention.

[0051] 1. Manufacturing method of seal body The sealed bodies of Examples 1 to 9 and Comparative Examples 1 to 2 were prepared by adding a crosslinking agent to the acrylic rubber (corresponding to the compound in the present invention) shown in Table 1 below as the main raw material, and then going through the kneading, pressing, and cutting steps included in the strip-shaped body forming step. In order to evaluate the performance of the sealed bodies of Examples 1 to 9 and Comparative Examples 1 to 2, the thin plate-shaped pressurized body that had been subjected to the pressing step was cut into a predetermined shape and size to prepare samples for evaluation. Therefore, the shape, etc. of the endless sealed body formed in the pressing step and the pressing and heating step in the manufacturing method of the sealed body may differ from that of the evaluation sample.

[0052] [Table 1]

[0053] Specifically, a chlorine-based acrylic rubber (Noxtite A-1095: manufactured by Unimatec Corporation) was used as the acrylic rubber containing a halogen-containing monomer, and 1-butylimidazole (manufactured by Tokyo Chemical Industry Co., Ltd.) was used as the crosslinking agent in Examples 1 to 9 and Comparative Example 1. Furthermore, hydrotalcite (DHT-4A: manufactured by Kyowa Chemical Industry Co., Ltd., crosslinking agent a) and hexamethylenediamine carbamate (ChemiNox AC6-66: manufactured by Unimatec Corporation, crosslinking agent b) were used as the crosslinking agents in Comparative Example 2.

[0054] (1) Addition of crosslinking agent (crosslinking agent addition process) In the case of Example 1, the amount of crosslinking agent added to the acrylic rubber was 1.0 part by weight of 1-butylimidazole crosslinking agent added to 100 parts by weight of the acrylic rubber, as shown in Table 1 above. In this case, the molar equivalent of the crosslinking agent to the halogen group of the halogen group-containing monomer was 0.2. These were mixed uniformly using a stirrer or the like to obtain the mixture of Example 1.

[0055] Similarly, based on Table 1 above, 1.6 parts by weight (molar equivalent: 0.3) of the crosslinking agent was added to 100 parts by weight of acrylic rubber in Example 2, 1.9 parts by weight (molar equivalent: 0.37) of the crosslinking agent in Example 3, 2.1 parts by weight (molar equivalent: 0.4) in Example 4, 2.6 parts by weight (molar equivalent: 0.5) in Example 5, 5.2 parts by weight (molar equivalent: 1.0) in Example 6, 10.3 parts by weight (molar equivalent: 2.0) in Example 7, 15.5 parts by weight (molar equivalent: 3.0) in Example 8, and 20.6 parts by weight (molar equivalent: 4.0) in Example 9 were added to 100 parts by weight of acrylic rubber, and the mixtures of Examples 2 to 9 were obtained by uniformly mixing them.

[0056] Also, 0.5 parts by weight (molar equivalent: 0.1) of a crosslinking agent was added to 100 parts by weight of acrylic rubber and mixed uniformly to obtain a mixture of Comparative Example 1. Furthermore, in Comparative Example 2, 3 parts by weight of hydrotalcite and 1 part by weight of hexamethylenediamine carbamate were added as crosslinking agents to 100 parts by weight of acrylic rubber and mixed uniformly to obtain a mixture of Comparative Example 2.

[0057] (2) Mixing (mill mixing process) The mixtures of Examples 1 to 9 and Comparative Examples 1 and 2, in which the acrylic rubber and crosslinking agent shown in Table 1 were used and the prescribed amount of crosslinking agent was added to the acrylic rubber, were kneaded using a mill kneader (Labo Plastomill 30C150, manufactured by Toyo Seiki Co., Ltd.) respectively. The kneading conditions were adjusted to a rotor blade rotation speed of 10 rpm, a temperature during kneading of 60°C or less, and kneading was performed for 20 minutes.

[0058] (3) Mixing (roller mixing process) The mill-kneaded product obtained in the mill kneading step was kneaded using a roll kneader (LABORATORY MILL, manufactured by Kansai Roll Co., Ltd.) Here, the kneading conditions were adjusted to a roll rotation speed of 10 rpm and a temperature during kneading in the range of 30 to 60° C., and kneading was further performed for a kneading time of 30 minutes.

[0059] (4) Pressurization (pressurization process) The kneaded products of Examples 1 to 9 and Comparative Examples 1 and 2 obtained by the roller kneading step were pressed using a press machine (80 ton press: manufactured by Hokutan Kikai Kogyo Co., Ltd.). Here, the pressing conditions were a pressing pressure of 95 kgf / cm 2 The pressing temperature during pressing was 150° C., the pressing time was 1 hour, and a pressing mold having a thickness of 2 mm was used. 2 The pressing temperature during pressing was 170°C, the pressing time was 30 minutes, and a pressing mold of 2 mm thickness was used.

[0060] 2. Evaluation of the self-assessment function (1) Preparation of measurement samples for evaluation From the thin plate-like pressurized bodies having a thickness of 2 mm of Examples 1 to 9 and Comparative Examples 1 to 2 obtained by the above pressurization process, test pieces 9 (see FIG. 3(a)) of a size of a dumbbell-shaped No. 8 shape defined in JIS K6251:2017 (vulcanized rubber and thermoplastic rubber - Determination of tensile properties) were punched out to prepare measurement samples for evaluating the self-repair function. The center of the obtained test piece 9 was cut with a knife and divided into a test piece 11a having a cut surface 10a and a test piece 11b having a cut surface 10b (see FIG. 3(b)). The test pieces 11a and 11b were placed in an oven with the inside adjusted to 100°C in a state in which the cut surfaces 10a and 10b of the test pieces 11a and 11b were in close contact with each other and joined together, and heated in the air for 24 hours. As a result, a measurement sample 9a for evaluating the self-repair function was obtained. In addition, in each of Examples 1 to 9 and Comparative Examples 1 and 2, a comparison sample was also prepared by placing the test pieces 11a and 11b in an oven and heating them in the air without cutting the test pieces 11a and 11b.

[0061] [Table 2]

[0062] (2) Evaluation of the formation of the seal body As shown in Table 2 below, it was shown that the measurement samples of Examples 1 to 9, in which the amount of crosslinking agent added to 100 parts by weight of acrylic rubber was 1.0 to 20.6 parts by weight (0.2 to 4 in terms of molar equivalent), which corresponds to the scope of the manufacturing method of the sealed body of the present invention, were capable of forming a sealed body (corresponding to "○" in Table 2). In other words, by heating in the pressure-bonded state, the cut surfaces 10a, 10b were bonded to each other and became integrated.

[0063] In contrast, in the measurement sample of Comparative Example 1, in which the amount of crosslinking agent added to 100 parts by weight of acrylic rubber was 0.5 parts by weight (0.1 in terms of molar equivalent), which falls outside the scope of the rights of the manufacturing method of the sealing body of the present invention, it was difficult to form the sealing body itself, and it was not possible to produce the test piece 9 shown in Fig. 3(a) etc. (corresponding to "x" in Table 2). On the other hand, in Comparative Example 2, it was possible to form the sealing body.

[0064] (3) Evaluation of self-repair rate The heated measurement samples were subjected to a tensile test under the following conditions using a tensile tester (Autograph AG-X, manufactured by Shimadzu Corporation). <Tensile test conditions> Tensile speed: 500mm / min Ambient temperature: Room temperature Ambient atmosphere: Atmospheric

[0065] Tensile tests were carried out on the measurement samples for evaluating the self-repairing function of Examples 1 to 9 and Comparative Example 2, and the respective control samples, and the self-repairing rates were evaluated as follows. That is, Self-repair rate (%) = [tensile strength of measurement sample for evaluation (N)] ÷ [tensile strength of control sample (N)] × 100

[0066] As shown in Table 2, Examples 1 to 9 exhibited a self-repair rate of at least 30% relative to the tensile strength of the comparison sample, and it was confirmed that Examples 1 to 5 in particular had a high self-repair rate of 65% or more. On the other hand, Comparative Example 2 had a self-repair rate of 21.8%, which was a lower value compared to Examples 1 to 9 and the like. Therefore, it is assumed that the measurement sample of Comparative Example 2 cannot exhibit high sealing properties. Note that, since it was impossible to form a sealing body in Comparative Example 1, the self-repair rate was not evaluated.

[0067] As shown above, it has been confirmed that the sealed body manufactured by the method for manufacturing a sealed body of the present invention has an excellent self-repair rate. Therefore, it has been confirmed that by performing a crimping process (or a crimping and heating process) in which one end and the other end are crimped together and heated after cutting to a predetermined size, the ends are integrated and exhibit sufficient strength. Therefore, it can be used as a sealed body and can exhibit high sealing properties, in other words, sufficient sealing performance.

[0068] (4) Compression test Compression test pieces (not shown) for evaluation of compression tests measuring 15 mm x 15 mm x 8 mm were prepared from the thin plate-like pressed bodies having a thickness of 8 mm obtained by the above pressing process (however, a pressing mold having a thickness of 8 mm was used) of Examples 1 to 9. The obtained compression test pieces were subjected to a compression test under the following conditions using a tensile tester (Autograph AG-IS 100 kN: manufactured by Shimadzu Corporation). <Compression test conditions> Test speed: 5mm / min Measurement direction: Compression direction Ambient temperature: Room temperature Ambient atmosphere: Atmospheric Maximum load: 1500N

[0069] Under the above compression test conditions, it was confirmed that the reaction force when the compression test pieces were compressed to 40% of their height before compression was 200 N or less in all cases.

[0070] 3. Evaluation of adhesion and peelability Measurement samples for evaluation of adhesion and peelability were prepared from the pressed bodies of Examples 1 to 9 and Comparative Examples 1 and 2 obtained by the above-mentioned pressing process, and after pressing under the following conditions, a tensile strength test was performed using a peel strength tester (LTS-200N-S100: manufactured by Minebea Co., Ltd.).

[0071] <Preparation of measurement samples for evaluation> Evaluation test specimens 12 for evaluating adhesiveness and peelability, having a length of 50 mm to 70 mm, a width of 18 mm, a thickness of 2 mm, and an adhesive part size of 18 mm x 18 mm, were prepared from the 2 mm-thick thin plate-like pressurized bodies of Examples 1 to 9 and Comparative Examples 1 and 2. Meanwhile, plate-like bodies 13a, 13b, and 13c made of different materials, each made of acrylonitrile butadiene rubber (hereinafter referred to as "NBR"), nylon, and aluminum, were prepared, each having the same size as evaluation test specimen 12, which was to be evaluated for adhesiveness and peelability, that is, a length of 50 mm to 70 mm, a width of 18 mm, and a thickness of 2 mm.

[0072] As shown in Fig. 4, the plates 13a and the like made of different materials are placed on top of each other, and are stacked so that only the upper surface of the area facing the adhesive portion 14 of the evaluation test sample 12 is exposed, and the other upper surfaces are covered with a fluororesin sheet 15. Furthermore, the 18 mm x 18 mm adhesive portion 14 of the evaluation test sample 12 is placed on top of the exposed portion 16 of the plates 13a and the like made of different materials that is not covered with the fluororesin sheet 15, and a stainless steel plate 17 adjusted to a size of 18 mm x 18 mm is placed on top of the adhesive portion 14. Then, a 3.3 kg weight 18 is placed on the stainless steel plate 17 so that the load (pressure) of the weight 18 is applied only on the adhesive portion 14 (see Fig. 4). This forms a stack of the dissimilar material plates 13a, the fluororesin sheet 15, the evaluation sample 12, the stainless steel plate 17, and the weight 18, stacked from below, and the weight of the weight 18 causes the adhesive portion 14 of the evaluation sample 18 to adhere tightly to the exposed portions 16 of the dissimilar material plates 13a, etc.

[0073] While maintaining this tightly adhered state, the sample is placed in an oven (not shown) and heated for 24 hours at atmospheric pressure at a heating temperature of 100° C. After 24 hours have passed, the sample is removed from the oven, and the adhesiveness and peelability of the evaluation sample 12 to the plate-like body 13a made of a different material in the adhesive portion 14 and exposed portion 16 are evaluated by a peel strength test.

[0074] <Peel strength measurement conditions> Peel strength tester: LTS-200N-S100 (Minebea Co., Ltd.) Tensile strength: 50mm / min Temperature: room temperature Peel angle: 90°

[0075] Based on the above-mentioned peel strength measurement conditions, the peel strength was measured at the part where the adhesive portion 14 and the exposed portion 16 were in close contact when the evaluation test sample 12 was peeled off in a 90° direction from the plate-like body 13a made of a different material, etc. The results are shown in Table 2 above.

[0076] As shown in Table 2, it was confirmed that Examples 1 to 9 exhibited peel strength values ​​that were almost equal (only Example 9) or higher than the peel strength values ​​with NBR, nylon, and aluminum of Comparative Example 2. In particular, a significant increase in peel strength was observed compared to Comparative Example 2 when aluminum was used as the dissimilar material plate member 13c.

[0077] As shown above, it was confirmed that the seal body manufactured by the seal body manufacturing method of the present invention has high peel strength against dissimilar materials. That is, it was shown that the seal body exhibited high peel strength against dissimilar materials of NBR, nylon, and aluminum, all of which were higher than the peel strength of Comparative Example 2. Therefore, it can be used as a seal body, and can exhibit high sealing properties, in other words, sufficient sealing performance.

[0078] 4.Water resistance evaluation Water resistance was evaluated using a water immersion test jig 19 shown in Fig. 5 and a water resistance test sample 20 (prepared by adding 0.37 equivalents of 1-methylimidazole to chlorine-based acrylic rubber) consisting of an endless seal body shown in Fig. 6. More specifically, the water immersion test jig 19 for evaluating water resistance was constructed by combining a vertical pipe 21 and a horizontal pipe 22, and was adjusted so that the pipe water depth H was 1 m. A sample 24 was formed by sandwiching the water resistance test sample 20 between the acrylic columnar member 23a and the SUS columnar member 23b, with the compression ratio adjusted to 10%, and was placed at the pipe bottom 26 of the pipe inner space 25, and was kept in this state for 30 minutes. As shown in Fig. 6, the water resistance test specimen 20 has an endless shape with a crimped joint 27, and a water leakage detection seal 28 capable of detecting water leakage by contact with water is disposed in the inner space (annular space) surrounded by the water resistance test specimen 20. Fig. 6 shows the water resistance test specimen 20 viewed from above with the acrylic cylindrical member 23a removed.

[0079] After leaving it for 30 minutes, the water resistance measurement sample 20 was removed from the water immersion test fixture 19 and visually checked for the presence or absence of water leakage into the water leakage detection seal 28. It was confirmed that the sample had water resistance equivalent to IPX7. [Industrial Applicability]

[0080] The method for manufacturing a seal body and the seal body of the present invention have industrial applicability in industrial fields in which various machine parts and the like using seal bodies are used. [Explanation of symbols]

[0081] 1: Manufacturing method of the seal body 2: Compound 3: Crosslinking agent 4:Mixture 5: Mixture 5a: Mill mix (mixture) 5b: Roll kneaded material (kneaded material) 6: Pressurized body 7: Band 7a: One end 7b: The other end 8: Seal body 9: Test piece 9a: Measurement sample for evaluating self-repair function 10a,10b: Cut surface 11a, 11b: Test pieces 12: Measurement sample for evaluation 13a, 13b, 13c: Plates made of different materials 14:Adhesive part 15: Fluorine resin sheet 16:Exposed part 17: Stainless steel plate 18: Weight 19: Water immersion test fixture 20: Water resistance test sample 21: Vertical pipe 22: Horizontal pipe 23a: Acrylic cylindrical member 23b: SUS cylindrical member 24: Sample 25: Space inside the pipe 26: Bottom of pipe 27: Joint 28: Water leak detection sticker S1: Crosslinking agent addition process (strip formation process) S2: Kneading process (strip formation process) S2a: Mill mixing process (strip formation process) S2b: Roll kneading process (strip formation process) S3: Pressurization process (band-shaped body formation process) S4: Cutting process (band forming process) S5: Pressure bonding heating process (pressure bonding process) H: Pipe depth t: thickness of pressure body

Claims

1. A method for producing a sealing body using a compound containing a halogen group-containing monomer as a constituent unit as a main raw material, comprising: adding a cross-linking agent to the compound and forming a strip from the resulting mixture; a crimping step of crimping one end and the other end of the strip obtained in the strip forming step together to form an endless sealed body; Equipped with The belt-shaped body forming step includes: A method for producing a sealed body, wherein the crosslinking agent is added so that the molar equivalent of the crosslinking agent relative to the halogen group of the halogen group-containing monomer contained in the compound is in the range of 0.2 to 4.

0.

2. A method for producing a sealing body using a compound containing a halogen group-containing monomer as a constituent unit as a main raw material, comprising: adding a cross-linking agent to the compound and forming a strip from the resulting mixture; a crimping step of crimping one end and the other end of the strip obtained in the strip forming step together to form an endless sealed body; Equipped with The belt-shaped body forming step includes: A mill kneading step using a mill kneader that kneads the mixture using a rotor blade; a roll kneading step using a roll kneader that kneads the mill-kneaded product obtained in the mill kneading step between a plurality of rolls; A method for manufacturing a seal body comprising the two-stage kneading process.

3. The kneading conditions in the kneading step are: The rotation speed of the rotor blade of the mill mixer performing the mill mixing step is in the range of 5 rpm to 20 rpm, the mixing temperature is in the range of 30° C. to 70° C., and the mixing time is in the range of 30 minutes to 60 minutes, The method for producing a sealed body according to claim 2, wherein the rotation speed of the rolls of the roll mixer performing the roll mixing step is in the range of 7 rpm to 20 rpm, the mixing temperature is in the range of 30 ° C to 80 ° C, and the mixing time is in the range of 10 minutes to 30 minutes.

4. The belt-shaped body forming step includes: A pressing step of pressing the mixture using a press machine is included. The pressure conditions of the pressure step are: The pressure applied by the press is 95 to 105 kgf / cm ２ 3. The method for producing a sealed body according to claim 1 or 2, wherein the pressing temperature is 150° C., the pressing time is 1 hour, and the thickness of the pressed body after pressing is adjusted to 2 mm.

5. The pressure bonding step includes: The method for manufacturing a sealed body according to claim 1 or 2, further comprising a compression heating step of heating the one end and the other end of the strip-shaped body in air at 100°C for 24 hours after the one end and the other end are compression bonded to each other.

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