JP2015068424A - Resin-made gasket for seal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a resin-made gasket for a seal which can have surface contours corresponding to undulation on a flange face to fill a gap generated between flanges, and thus can be favorably used as a seal material used for sealing connection of pipes, a connection part of a reactor, or a lid part of a reactor, or the like.SOLUTION: In a resin-made gasket used for sealing connection of pipes, a connection part of a reactor, or a lid part of a reactor, curable resin 2 is filled in a flexible tube 1, and the flexible tube 1 is wound. An outer casing 3 made of fluorine resin is formed on the surface of the wound flexible tube 1.

Description

  The present invention relates to a resin gasket for sealing. More specifically, the present invention relates to a resin gasket for sealing that can be suitably used as a sealing material used for sealing pipes, a connecting portion of a reactor, or a lid portion of a reactor.

  In general, in order to suppress corrosion of pipes and reactors made of a metal material, glass lining is sometimes applied to places where the pipes and reactors are easily corroded. When glass lining is applied to the easily corroded portion, the glass has excellent corrosion resistance, so even if a fluid having a property of corroding a metal material comes into contact with the portion, the occurrence of corrosion at the portion is suppressed. Can do. Accordingly, pipes, reactors, and the like in which glass lining is applied to portions that are easily corroded are used in a wide range of fields such as petrochemical industry, pharmaceutical industry, fine chemical field, and electronic / electronic equipment field.

  However, pipes and reactors with glass lining on the flange surface have a large waviness on the flange surface. Therefore, it is necessary to absorb the waviness of the flange with a gasket. The gasket is preferably a soft sheet to absorb the waviness of the flange, but on the other hand, the contents may leak due to a partial compression ratio difference due to the waviness, or the gasket will compress when the flange is tightened strongly. Therefore, the glass lining glass may break.

  Therefore, as a fluororesin sheet with a filler that achieves both high stress relaxation and high airtightness (sealability) even when the filling rate of the fluororesin is low and the filling rate of the filler is high, for example, graphite, carbon There has been proposed a fluororesin sheet containing a filler in which a filler such as a carbon filler such as black, an inorganic filler such as talc, a resin powder, or a fiber material such as carbon fiber is blended (for example, patent document). 1).

  However, the fluororesin sheet has high stress relaxation and high air tightness, but since the compressibility is small, a gap is formed between the flange and the gasket, and gas or liquid in the pipe may leak from the gap. There is.

JP 2007-253519 A

  The present invention has been made in view of the above prior art, and can form a surface shape corresponding to the undulation of the flange surface, eliminate the gap generated between the flanges, and connect the pipes to each other and the connection part of the reactor. Alternatively, an object of the present invention is to provide a sealing resin gasket that can be suitably used as a sealing material used to seal a lid of a reactor.

  The present invention relates to a resin gasket used for sealing pipes, a connection part of a reactor or a lid part of a reactor, the flexible tube being filled with a curable resin, and the flexible tube The present invention relates to a resin gasket for sealing, characterized in that a sheath made of a fluororesin is formed on the surface of the wound flexible tube.

  According to the present invention, the surface shape corresponding to the waviness of the flange surface can be formed, the gap generated between the flanges can be eliminated, and the pipes, the connection part of the reactor or the lid part of the reactor can be sealed. Provided is a resin gasket for sealing that can be suitably used as a sealing material or the like used in the above.

It is a schematic plan view which shows one embodiment of the resin gasket for sealing of this invention. It is a schematic explanatory drawing which shows the state by which the resin-made gasket for sealing of this invention is pinched | interposed between the flanges of piping.

  As described above, the sealing resin gasket of the present invention is a resin gasket used for sealing pipes, reactor connections or reactor lids, and is curable in a flexible tube. The resin is filled, the flexible tube is wound, and a jacket made of a fluororesin is formed on the surface of the wound flexible tube.

  The sealing resin gasket of the present invention includes, for example, a flexible tube filled with a curable resin, and then the flexible tube is wound, and a fluororesin is formed on the surface of the wound flexible tube. It can manufacture easily by forming the outer jacket which consists of.

  Since the diameter of the flexible tube differs depending on the type of piping and reactor, it cannot be determined unconditionally. The sealing resin gasket of the present invention forms a surface shape corresponding to the waviness of the flange surface, and can eliminate the gap generated between the flanges. From the viewpoint of sealing, the diameter of the flexible tube is usually preferably about 1 to 20 mm.

  Since the length of the flexible tube varies depending on the type of piping and reactor, it cannot be determined unconditionally. The length of the flexible tube can be appropriately adjusted according to the inner diameter and outer shape of the sealing resin gasket of the present invention.

  The wall thickness of the flexible tube is such that the resin gasket for sealing of the present invention forms a surface shape corresponding to the waviness of the flange surface, and the gap generated between the flanges can be eliminated. From the viewpoint of sealing the connecting portion of the reactor or the lid portion of the reactor, it is usually preferably about 0.3 to 3 mm.

  Examples of the cross-sectional shape of the flexible tube include a circular shape, an elliptical shape, a square shape, a rectangular shape, and a spindle shape. However, the present invention is not limited to such examples.

  Examples of the resin used for the flexible tube include polyolefin resins such as polyethylene, polypropylene, ethylene-propylene copolymer, vinyl chloride resins, vinyl acetate resins, polyester resins, polyamide resins represented by various nylons, Although a fluororesin, an acrylic resin, etc. are mentioned, this invention is not limited only to this illustration.

  The flexible tube can be manufactured by extrusion molding using the above-mentioned resin by a conventional method, and a commercially available product can also be used.

  The flexible tube is filled with a curable resin. In the present invention, the flexible tube may be wound after the curable resin is filled in the flexible tube, or the curable resin is filled after the flexible tube is wound. May be. Further, for example, after placing a flexible tube wound on the lower flange of the pipe, the flexible tube may be filled with a curable resin.

  Examples of the curable resin filled in the flexible tube include a thermosetting resin, a two-component curable resin, an ultraviolet curable resin, a moisture curable resin, a solvent volatile resin, and an anaerobic curable resin. Although resin etc. are mentioned, this invention is not limited only to this illustration. These curable resins may be used alone or in combination of two or more.

  Examples of the thermosetting resin include a thermosetting epoxy resin, a thermosetting acrylic resin, a thermosetting melamine resin, a thermosetting polyester resin, a thermosetting phenol resin, a thermosetting urea resin, and a thermosetting resin. A benzoguanamine resin, a thermosetting rosin-modified maleic acid resin, a thermosetting rosin-modified fumaric acid resin, and the like can be mentioned, but the present invention is not limited to such examples. These thermosetting resins may be used alone or in combination of two or more. Examples of thermosetting resins that can be easily obtained commercially include Mitsubishi Chemical Corporation, product number: 828 (main agent) and product number: DICY7 (curing agent). It is not limited only to such illustration.

  Examples of the two-component curable resin include a two-component epoxy resin, a two-component acrylic resin, and a two-component silicone resin. However, the present invention is not limited to such examples. These thermosetting resins may be used alone or in combination of two or more. As a two-component curable resin that can be easily obtained commercially, for example, two-component type such as manufactured by Debcon, product number: HR-300, manufactured by Nissin Resin Co., Ltd., trade name: POP METAL L, etc. An epoxy-based curable resin and the like can be mentioned, but the present invention is not limited to such illustration.

  Examples of the ultraviolet curable resin include an ultraviolet curable epoxy resin, an ultraviolet curable acrylic resin, an ultraviolet curable silicone resin, an ultraviolet curable polyester resin, and the like, but the present invention is limited only to such examples. Is not to be done. These ultraviolet curable resins may be used alone or in combination of two or more. Examples of the ultraviolet curable resin that can be easily obtained commercially include Three Bond Co., Ltd., product number: TB3018, but the present invention is not limited to such examples.

  The moisture curable resin is a resin having a property of being cured by reacting with moisture in the air. Examples of the moisture curable resin include a moisture curable epoxy resin, a moisture curable acrylic resin, a moisture curable silicone resin, and the like, but the present invention is not limited to such examples. These moisture curable resins may be used alone or in combination of two or more. As a moisture curable resin that can be easily obtained commercially, for example, manufactured by ThreeBond Co., Ltd., product number: TB1530, and the like can be mentioned, but the present invention is not limited only to such illustration. When a moisture curable resin is used as the curable resin, a resin sheet having moisture permeability is used for the flexible tube.

  The solvent volatilization type curable resin is a resin having a property of curing when the solvent is volatilized. Examples of the solvent volatile resin include a solvent volatile vinyl acetate curable resin and a solvent volatile nitrile rubber curable resin, but the present invention is not limited to such examples. . These solvent volatilization type curable resins may be used alone or in combination of two or more. Examples of the solvent-volatile curable resin that can be easily obtained commercially include Three Bond Co., Ltd., product number: 1401, and the like, but the present invention is not limited to such examples. In addition, when using solvent volatilization-type curable resin as curable resin, the flexible tube uses the resin sheet which has the property to permeate | transmit the vapor | steam of a solvent.

  An anaerobic curable resin is a resin having a property of being cured by contact with a metal in a state where air is blocked. Examples of the anaerobic curable resin include an anaerobic acrylic curable resin, but the present invention is not limited to such examples. Examples of the anaerobic curable resin that can be easily obtained commercially include ASEC Co., Ltd., product number: AS-6001. However, the present invention is not limited to such examples. Absent.

  Among the curable resins, a thermosetting resin and a two-component curable resin are preferable from the viewpoint of easy operation when the curable resin is cured.

  The amount of the curable resin filled in the flexible tube varies depending on the application of the sealing resin gasket of the present invention and cannot be determined unconditionally. However, normally, there are voids in the flexible tube. It is preferable to fill the curable resin so as not to occur.

  Next, a jacket made of a fluororesin is formed on the surface of the wound flexible tube. In the present invention, since the outer cover made of a fluororesin is formed on the surface of the wound flexible tube, for example, when it comes into contact with a fluid such as liquid or gas used in the pipe. However, it is possible to suppress deterioration of the flexible tube.

  As shown in FIG. 1, the jacket 3 may cover the entire surface of the wound flexible tube 1, or cover the inner peripheral surface of the wound flexible tube 1 and the vicinity thereof. It may be. As the material of the outer cover 3, a sheet made of a fluororesin can be usually used. The thickness of the outer jacket 3 varies depending on the application of the sealing resin gasket of the present invention and cannot be determined unconditionally. However, it is usually preferably about 0.1 to 2 mm.

  As described above, the sealing resin gasket of the present invention is formed. Since the size of the sealing resin gasket of the present invention varies depending on the type of piping and reactor and cannot be determined unconditionally, it is preferably adjusted as appropriate according to the type of piping. As an example of the resin gasket for sealing of the present invention, for example, the inner diameter is about 20-285 cm, the outer diameter is about 25-300 cm, the difference between the outer diameter and the inner diameter is about 5-15 cm, Examples thereof include a resin gasket for sealing whose inner circumference is a concentric circle. In addition, since the overall thickness of the sealing resin gasket of the present invention varies depending on the type of piping and reactor, etc., it cannot be determined unconditionally, so it should be adjusted appropriately according to the type of piping. Is preferred. The entire thickness of the sealing resin gasket of the present invention forms a surface shape corresponding to the waviness of the flange surface, and can eliminate the gap generated between the flanges. From the viewpoint of being able to be suitably used as a sealing material used for sealing the lid of the reactor, it is usually preferably about 2 to 20 mm.

  Next, although the method to fix piping using the resin gasket for sealing of this invention is demonstrated, this invention is not limited only to this description.

  First, for example, as shown in a schematic explanatory view showing a state in which the sealing resin gasket of the present invention shown in FIG. 2 is sandwiched between the flanges of the pipe, between the upper flange 4 and the lower flange 5 of the pipe. The sealing resin gasket 6 of the present invention is sandwiched, and the upper flange 4 and the lower flange 5 are fastened with bolts 7. Then, since the sealing resin gasket 6 of the present invention is deformed so as to conform to the shape of the upper flange 4 and the lower flange 5, the gap between the upper flange 4 and the lower flange 5 can be eliminated. In this case, the upper flange 4 and the lower flange 5 may be temporarily tightened with the bolt 7 described above, and the final tightening may be performed after the curable resin is cured. The upper flange 4 and the lower flange 5 may be tightened with the bolt 7 described above. It is good also as this tightening.

  Next, the curable resin in the sealing resin gasket 6 sandwiched between the upper flange 4 and the lower flange 5 is cured while the upper flange 4 and the lower flange 5 are tightened with the bolts 7. By doing so, the sealing resin gasket 6 in which the curable resin is cured can be formed.

  Thus, by using the sealing resin gasket 6 of the present invention, the surface shape corresponding to the undulation of the flange surface can be obtained by a very simple operation of simply fastening the upper flange 4 and the lower flange 5 with the bolts 7. The gap formed between the flanges can be eliminated.

  After the curable resin in the sealing resin gasket 6 is cured as described above, the upper flange 4 and the lower flange 5 may be further tightened with the bolts 7 as the final tightening as described above.

  In addition, the method of hardening | curing curable resin used for the resin-made gaskets for sealing of this invention changes with kinds of the said curable resin.

  When a thermosetting resin is used as the curable resin, a heating medium such as a heating wire typified by a nichrome wire is contained in the flexible tube of the sealing resin gasket of the present invention, A heating medium is disposed on the inner or outer peripheral surface of the tube, a sealing resin gasket is sandwiched between the upper flange and the lower flange, the upper flange and the lower flange are tightened with bolts, and then the heating medium is removed. The thermosetting resin can be cured by heating. When a thermosetting resin is used, for example, a heating medium such as a rubber heater is interposed on the contact surface between the bag-like gasket of the sealing resin gasket of the present invention and the upper flange and / or the lower flange, and the upper flange The thermosetting resin can be cured by heating the heating medium after the bolt and the lower flange are tightened. Furthermore, the resin resin gasket for sealing of the present invention is sandwiched between the upper flange and the lower flange, the upper flange and / or the lower flange are tightened with bolts, and then the upper flange and / or the lower flange is heated to achieve thermosetting. The resin can also be cured.

  In the case of using a two-component curable resin as the curable resin, after producing the sealing resin gasket of the present invention by injecting from the opening of the flexible tube using an injector with a static mixer or the like The sealing resin gasket may be sandwiched between an upper flange and a lower flange, and the upper flange and the lower flange may be clamped with bolts to be cured by reacting with a two-component curable resin.

  When an ultraviolet curable resin is used as the curable resin, the sealing resin gasket of the present invention is sandwiched between the upper flange and the lower flange of the pipe, and after tightening the upper flange and the lower flange with bolts, The ultraviolet curable resin can be cured by irradiating the sealing resin gasket with ultraviolet rays.

  When a moisture curable resin is used as the curable resin, the sealing resin gasket of the present invention is sandwiched between the upper flange and the lower flange, the upper flange and the lower flange are tightened with bolts, and then the seal The moisture curable resin can be cured by applying moisture to the resin gasket.

  When using a solvent-volatile curable resin as the curable resin, the sealing resin gasket of the present invention is sandwiched between the upper flange and the lower flange, and after tightening the upper flange and the lower flange with bolts, By removing the solvent from the surface of the sealing resin gasket, the solvent-evaporating curable resin can be cured.

  When an anaerobic curable resin is used as the curable resin, the sealing resin gasket of the present invention is sandwiched between the upper flange and the lower flange of the pipe, and the upper flange and the lower flange are tightened with bolts and left to stand. By doing, an anaerobic curable resin can be hardened. If the anaerobic curable resin is not sufficiently cured, the anaerobic curable resin can be further cured by irradiating the anaerobic curable resin with, for example, ultraviolet rays.

  As described above, the sealing resin gasket of the present invention can form a surface shape corresponding to the waviness of the flange surface, and can eliminate the gap generated between the flanges. In addition, since the resin gasket for sealing of the present invention can be easily adjusted in diameter by adjusting the length of the flexible tube, it can be easily adapted to flanges of pipes of various sizes. be able to.

  Therefore, the resin gasket for sealing of the present invention can be suitably used, for example, as a sealing material for sealing pipes, a connecting part of a reactor or a lid part of a reactor.

  EXAMPLES Next, although this invention is demonstrated further in detail based on an Example, this invention is not limited only to this Example.

Example 1
As the flexible tube, a vinyl chloride resin tube having a diameter of 10 mm, a length of 340 cm, and a wall thickness of 2 mm is used. The flexible tube has an inner diameter of 325 mm and an outer diameter of 380 mm. It was wound.

  In the flexible tube, a two-component curable resin [manufactured by Nissin Resin Co., Ltd., two-component curable resin, product name: POP METAL L] is statically introduced from the opening of the flexible tube as a curable resin. It injected so that it might spread uniformly in the inside of a flexible tube using the injection machine with a mixer. Thereafter, the entire wound flexible tube was covered with a fluororesin sheet having a thickness of 0.4 mm to produce a sealing resin gasket.

Next, the resin gasket for sealing obtained above was mounted between steel flanges having a diameter of 515 mm, a height of 36 mm, and a surface roughness R _{max of} 12 μm. The curable resin was cured by being left for a period of time. Thereafter, tightening was further performed with bolts, and final tightening was performed by applying a load so that the surface pressure was equivalent to 20 MPa.

  The fastening body was put in a water tank filled with water, and after applying a pressure of 1 MPa with nitrogen gas from the through hole for introducing pressure provided on the flange to the inner diameter side of the sealing resin gasket, the state was maintained for 10 minutes. . Thereafter, the amount of nitrogen gas leaked from the fastening body per unit time was measured, the amount of leakage was measured, and evaluated based on the following evaluation criteria. As a result, it was possible to obtain an evaluation of ◎, so the resin gasket for sealing obtained above formed a surface shape corresponding to the waviness of the flange surface, eliminating the gap generated between the flanges. It was confirmed that

(Evaluation criteria)
A: Leakage amount is less than 1.7 × 10 ⁻⁴ Pa · m ³ / s ×: Leakage amount is 1.7 × 10 ⁻⁴ Pa · m ³ / s or more, or a gasket is manufactured due to embrittlement Difficult

  From the above results, the sealing resin gasket of the present invention can form a surface shape corresponding to the waviness of the flange surface, and can eliminate gaps generated between the flanges. It turns out that it can be used conveniently as a sealing material etc. which are used in order to seal the cover part of a reactor.

DESCRIPTION OF SYMBOLS 1 Flexible tube 2 Curable resin 3 Outer casing 4 Upper flange 5 Lower flange 6 Sealing resin gasket 7 Bolt

Claims (1)

  It is a resin gasket used to seal pipes, reactor connections or reactor lids, filled with a curable resin in a flexible tube, and the flexible tube is wound A resin gasket for sealing, wherein a sheath made of a fluororesin is formed on the surface of the wound flexible tube.

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