JPH09255086A - Molding with flange - Google Patents

Abstract

PROBLEM TO BE SOLVED: To cement together flanges of moldings made of a synthetic resin with an adhesive by an enough adhesive force and with good sealability. SOLUTION: A step difference S is provided in such a way that the first mating surface 6 of the apex part 4a of a flange 4 is more projected than the second mating surface 8 of the base end part of the flange 4. A recessed adhesive channel 10 is formed between the first mating surface 6 of the apex part of the flange 4 and the second mating surface 8 of the base end part of the flange 4. A recessed seal member mounting channel 12 is formed on the inside of the second mating surface 8 between the adhesive channel 10 and the second mating surface 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is suitable for assembling a molded body made of, for example, a synthetic resin to form a hollow assembly, and for joining flanges provided on the molded body in a sealed state. A molded body having a flange.

[0002]

2. Description of the Related Art In a hollow body which is required to be hermetically sealed,
Due to the size and shape of the hollow body, it may not be possible to mold the hollow body with a single molded body. In such a case, a method of sealingly joining a plurality of members is adopted.

For example, in the case where metal molded bodies are joined in a hermetically sealed state, an O-ring groove is formed on a joint surface of a flange formed on the metal molded body, and an O-ring or the like is sealed in the O-ring groove. A sealing joint structure for accommodating members and fastening flanges by fastening means such as bolts so that the sealing member is compressed is already known.

However, since the metal molded body has drawbacks such as being heavy and difficult to cut, in recent years, attempts have been made to mold the metal molded body conventionally made of metal with a synthetic resin. It is flourishing.

[0005]

As a structure for hermetically joining synthetic resin molded bodies, it is conceivable to apply the above-described technique for hermetically joining metal molded bodies to each other. The body has the following problems.

Since the mating surface of the flange of the conventional resin molded product is substantially flush with the front end portion and the base end portion, the tightening force by the bolt cannot be transmitted well to the sealing material.
The sealing property on the mating surfaces is insufficient. In particular, when the molded products to be joined are made of a flexible material such as a thermoplastic resin, the strength of the resin is low and the tightening force of the bolt acts only around the bolt. The sealing material of No. 1 cannot be compressed well, and the seal is weak, which may cause leakage.

Further, even when the mating surfaces of the flanges are to be connected to each other only by the adhesive without using the sealing material,
The conventional flange structure has a problem in terms of hermeticity. If the molded products to be joined are made of FRP (fiber reinforced plastic) such as SMC (seal molding compound), the mechanical strength of the flange of the obtained molded product is sufficient. However, manufacturing a flange having a packing groove, a bolt hole, or the like by FRP is complicated and time-consuming, is not suitable for mass production, and is not practical.

For this reason, conventionally, a general structure has been used in which molded articles to be joined are molded with a synthetic resin, a sealing compound or grease is applied to these joint surfaces, and the joints are lightly joined with a fastening means such as a clamp. there were. However,
In this method, there is a problem that unevenness is likely to occur in the sealing property at the joint.

In Japanese Patent Laid-Open No. 4-331,115 and Japanese Patent Laid-Open No. 5-112,306, a resin for joining is injection-molded on a flange portion which is a joint between the molded articles made of synthetic resin. , A structure for joining them is disclosed. However, this method has a problem that, when joining relatively large-sized molded bodies to each other, the equipment becomes large and the work becomes complicated, which is not practical.

The present invention has been made in view of the above circumstances, and a molded product having a flange capable of joining flanges of a synthetic resin molded product to each other with a sufficient adhesive force with a good sealing property by using an adhesive. The purpose is to provide.

[0011]

In order to achieve the above object, in a molded article having a flange according to the present invention, the first mating surface of the tip of the flange is more than the second mating surface of the base of the flange. It is characterized in that a step is provided so as to project also.

The first mating surface at the tip of the flange,
It is preferable that an adhesive groove, which is recessed inward from these mating surfaces, is formed between the base end portion of the flange and the second mating surface. Between the adhesive groove and the second mating surface,
It is preferable that a recessed seal member mounting groove is formed.

It is preferable that a convex portion is formed at the tip of the flange having the first mating surface to cover the outer circumference of another flange joined to the flange. The molded body having the flange according to the present invention is not particularly limited,
It is preferably composed of a polynorbornene resin obtained by reaction injection molding. In particular, those composed of a ring-opened polymer of a norbornene-based monomer modified with an elastomer are preferable.

In the molded body having the flange according to the present invention,
When an adhesive is interposed between another member to which the flange is joined and the flange is fastened to the other member by fastening means such as bolts and nuts, first, the first mating surface at the tip of the flange is It is pressed against the mating surfaces of other members. When tightened further, the flange is slightly deformed so that the second mating surface approaches the mating surface of the other member. As a result, at least the first mating surface formed on the tip portion of the flange comes into close contact with the mating surfaces of the other members. Also, the second
By deforming the flange so that the mating surface approaches the mating surface of another member, the adhesive agent interposed therebetween is uniformly and well fitted to the first mating surface and the second mating surface of the flange, and the adhesiveness is improved. And the sealing property is improved.

Further, by tightening the flange to another member with the seal member such as packing interposed in the seal member mounting groove of the flange, the seal member is also compressed well as the flange is deformed, and the sealing property is improved. Is further improved. In addition, by forming a convex portion that covers the outer circumference of another flange joined to this flange at the tip end portion of the flange on which the first mating surface is formed, the adhesive that has exuded from the first mating surface can be applied to the flange. It doesn't overflow the perimeter. Therefore, the joint strength of the flange is improved, and the appearance of the flange joint is good.

Further, the molded article having the flange according to the present invention is made of polynorbornene resin obtained by reaction injection molding, so that the flange in which the adhesive groove, the seal member mounting groove, the bolt hole, etc. are formed. Can be molded very easily. Further, by forming the flange with a polynorbornene-based resin, it is elastically deformed by the tightening force of the fastening means such as bolts and nuts, and even if it is deformed, cracks do not occur and the strength does not decrease.

In addition to the bolts and nuts, examples of the fastening means include those that utilize elasticity of springs and the like, and those that sandwich the flange by utilizing the recoverability of the shape memory material due to heat and the like. Further, as the seal member mounted in the seal member mounting groove, it is preferable to use a seal member made of a material softer than the synthetic resin forming the molded body. As the material of the seal member, a rubber material such as butyl rubber, chloroprene rubber, nitrile rubber, natural rubber, or a foamed material of a rubber material is used, and butyl rubber having excellent flexibility is preferably used.

The adhesive interposed between the mating surfaces of the flanges is not particularly limited, but urethane adhesives, epoxy adhesives, butyl rubber adhesives and the like can be exemplified.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION A molded article having a flange according to the present invention will be described below in detail with reference to the embodiments shown in the drawings. First Embodiment The embodiment shown in FIG. 1 is an example in which two molded bodies 2 having flanges 4 having the same cross-sectional shape are joined.

In this embodiment, the tip 4 of each flange 4 is
a is thicker than the base end. Moreover, the first mating surface 6 of the front end portion 4a of the flange 4 is configured to project more than the second mating surface 8 of the base end portion. The step S between the first mating surface 6 of the tip portion 4a and the second mating surface 8 of the base end portion is preferably about 0.5 to 2.5 mm.
If this step S is too small, the deformation of the flange 4 due to the tightening force of the bolt 18 and the nut 20 as the fastening means is small, and the effect of improving the adhesiveness and the sealing property is small. Further, if the step S is too large, the tightening force may be excessively applied, and the deformation of the flange 4 becomes too large, which is not preferable.

[0021] The thickness t ₁ of the front end portion 4a of the flange 4, the thickness of the base end portion of the flange 4 in case of a t _2, t ₂ +2
-30 mm (preferably t ₂ + 3-15 mm) is desirable. The thickness t ₂ of the base end portion is preferably approximately the same as the thickness t ₃ of the molded body 2 on which the flange 4 is formed.
The thickness t ₃ of the molded body 2 is not particularly limited, but is preferably 4 mm or more. By making it 4 mm or more, it is possible to have sufficient strength. However, the upper limit of the thickness t ₃ is
It is preferably 30 mm or less, more preferably 20 mm or less, and particularly preferably 15 mm or less. If it is too thick, molded body 2
Manufacturing becomes difficult.

In the flange 8 of this embodiment, an adhesive groove 10 and a seal member mounting groove 12 are formed between the first mating surface 6 at the front end and the second mating surface 8 at the base end. is there. The adhesive groove 10 is preferably recessed to about 0.5 to 3 mm. The seal member mounting groove 12 has the second mating surface 8
Further, it is recessed further inward, preferably about 2 to 5 mm. The adhesive groove 10 is filled with an adhesive 14, and the seal member mounting groove 12 is provided with a packing 16.

The flanges 4 and 4 are fixed to each other outside the packing 16 by bolts 18 and nuts 20. As the adhesive 14, a urethane adhesive,
An epoxy adhesive, a butyl rubber adhesive or the like can be used. As the material of the packing 16, a rubber material such as butyl rubber, chloroprene rubber, nitrile rubber, natural rubber, or a foamed material of a rubber material is used, and butyl rubber excellent in flexibility is preferable.

In this embodiment, the molded body 2 on which the flange 4 is formed is made of a polynorbornene resin obtained by a reaction injection molding method (RIM). In particular, a polymer obtained by ring-opening polymerization of a norbornene-based monomer using a metathesis catalyst and an activator thereof in the presence of an elastomer is preferable.

Examples of the elastomer include polybutadiene, styrene-butadiene copolymer (SBR), styrene-butadiene-styrene block copolymer (SB).
S), polyisoprene, styrene-isoprene-styrene block copolymer (SIS), ethylene-propylene-diene terpolymer (EPT) and the like.

The blending ratio of the elastomer is 1 to 20 parts by weight, preferably 2 to 15 parts by weight, based on 100 parts by weight of the norbornene-based monomer. When the blending ratio of the elastomer is low, the flexibility decreases. Conversely, if the proportion of the elastomer is too large, the glass transition temperature decreases and the strength decreases, which is not preferable.

The norbornene-based monomer is a cycloolefin having a norbornene ring such as dicyclopentadiene, dihydrodicyclopentadiene, tetracyclododecene and tricyclopentadiene. The metathesis catalyst is not particularly limited as long as it is a known metathesis catalyst for bulk polymerization of norbornene-based monomers such as organic ammonium molybdates such as tungsten hexachloride, tridodecyl ammonium molybdate, and tri (tridecyl) ammonium molybdate. However, organic ammonium molybdate is particularly preferred.

Examples of the activator (cocatalyst) include alkylaluminum halides such as ethylaluminum dichloride and diethylaluminum chloride, alkoxyalkylaluminum halides thereof, and organic tin compounds. As a preparation for reaction injection molding, a reaction injection molding material containing a norbornene-based monomer, a metathesis catalyst, and an activator as a main component is a liquid comprising a norbornene-based monomer and a metathesis catalyst, and the norbornene-based monomer and the activator are used. Separately into two stable liquids and separate liquids. At the time of reaction injection molding, the two liquids are mixed, and then the mixed liquid is injected into the cavity of the mold, and bulk polymerization is performed in the cavity to obtain the molded body 2.

The mold used for the reaction injection molding is not necessarily an expensive mold having high rigidity, and is not limited to a metal mold, but may be a resin mold or a simple mold. This is because the reaction injection molding of the norbornene resin can be performed at a relatively low temperature and a low temperature by using a low-viscosity reaction liquid.
The inside of the mold is preferably sealed with an inert gas, and the components used for the polymerization reaction are preferably stored and operated under an atmosphere of an inert gas such as nitrogen gas.

The mold temperature is preferably from 10 to 150
C., more preferably 30 to 120.degree. C., still more preferably 50 to 100.degree. Mold pressure is usually 0.1-1
It is in the range of 00 kg / cm ² . The polymerization time may be appropriately selected, but is usually from 30 seconds to 2 hours after the completion of the injection of the reaction solution.
It is 0 minutes, preferably 5 minutes or less.

Since the molded body 2 having the flange 4 according to this embodiment is made of polynorbornene resin obtained by the reaction injection molding method, a relatively large molded body can be easily molded. Further, the polynorbornene-based resin can have a sufficient pressure resistance required for the molded body 2 by utilizing the material characteristic that the specific rigidity is low but the specific strength is high.

In the present embodiment, by increasing the thickness t ₁ of the tip end portion of the flange 4, the flange 4 is reinforced, and even if an external force acts on the portion of the flange 4, the portion is less likely to be damaged. . Further, by increasing the thickness t ₁ of the tip end portion of the flange 4, the mating surface 6 of the tip end portion does not have a wavy shape along the longitudinal direction, and the mating surface 6 can be smoothed.

Further, by providing the step S, when the flanges 4 and 4 are tightened with the bolt 18 and the nut 20, first the first mating surfaces 6 and 6 of the tip end portions of the flanges 4 and 4 are pressed against each other. When tightened further, the flanges 4 and 4 are deformed so that the second mating surfaces 8 and 8 come closer to each other. The distance between the second mating surfaces 8 and 8 after tightening (2 × S after tightening) is preferably 0 to 4 mm. As a result of this deformation, at least the tips 4a, 4a of the flanges 4, 4
The first mating surfaces 6 and 6 formed in the above are evenly adhered to each other. Further, the flanges 4 and 4 are deformed so that the second mating surfaces 6 and 6 come close to each other, so that the adhesive 1 interposed therebetween is formed.
4 is the first mating surfaces 6, 6 of the flanges 4, 4 and the second
The mating surfaces 8 and 8 are uniformly and well fitted, and the adhesiveness and the sealing property are improved.

Further, by tightening the flanges 4 and 4 with the packing 16 interposed in the seal member mounting grooves 12 and 12 of the flanges 4 and 4, the packing 16 can be satisfactorily deformed as the flanges 4 and 4 are deformed. It is compressed and the hermeticity is further improved. Further, in this embodiment, the molded body 2 having the flange 4 is made of polynorbornene-based resin obtained by reaction injection molding, so that the adhesive groove 10, the seal member mounting groove 12, the hole for the bolt 18, and the like are formed. The formed flange 4 can be molded very easily. Further, the flange 4 is made of polynorbornene-based resin, so that the flange 4 is elastically deformed by the tightening force of the bolt 18 and the nut 20, and even if the flange 4 is deformed, cracks are not generated and the strength is reduced. Nor.

Second Embodiment As shown in FIG. 2, in the present embodiment, the flange 4 of one molded body 2 has the same structure as the flange 4 of the first embodiment, and the flange 40 of the other molded body 2 is used. Tip 40a of
Is different from the structure of the flange 4.

In this flange 40, the tip portion 40a of the flange 40 on which the first mating surface 6 is formed covers the outer periphery of the other flange 4 joined to this flange 40.
2 are formed. The flange 40 has the same structure as the flange 4 except that the convex portion 42 is integrally formed at the tip of the flange 40.

In this embodiment, the convex portion 42 is attached to the flange 40.
By forming it on the tip portion 40a of the first mating surface 6,6
The adhesive that has exuded from each other does not overflow onto the outer periphery of the flanges 4, 40. Therefore, the joint strength of the flanges 4 and 40 is improved, and the appearance of the flange joint portion is also good.

The other actions of the molded body having the flange of this embodiment are the same as those of the first embodiment. Third Embodiment As shown in FIG. 3, in the present embodiment, the flanges of various shaped bodies 2a to 2e having the flange 4 having the structure shown in FIG. 1 are connected to each other by the connection structure shown in FIG. The septic tank casing is manufactured. Ribs or corrugates 30 may be formed on each of the molded bodies 2a to 2e, if necessary.

As shown in FIG. 3, the casing of the septic tank can be produced by combining the molded products having the flange 4 according to this embodiment. In the septic tank of the present embodiment, since the joint strength and the sealing property at the connecting portions of the flanges 4 and 4 are good, it is possible to easily manufacture even a large septic tank.

The present invention is not limited to the above-described embodiment, but can be variously modified within the scope of the present invention. For example, the molded product having a flange according to the present invention can be bonded not only to another molded product having a flange but also to another member such as a simple plate material having no flange. Further, the assembly produced by assembling the molded body having the flange according to the present invention is not limited to the casing of the septic tank, but is used as a water tank, a tank, or other assembly, etc., which is particularly required to be hermetically sealed. be able to.

[0041]

The present invention will now be described based on more specific examples of the present invention, but the present invention is not limited to these examples. Example 1 85% of dicyclopentadiene (DCP) and 15% of asymmetric cyclopentadiene trimer were used, and 5% of styrene-isoprene-styrene block copolymer (Kreton 1170, manufactured by Shell Co.) and phenol type were used. 2% of Irganox 1010 (manufactured by Ciba Geigy), which is an antioxidant of, is dissolved in 2 containers, and this is placed in two containers. One is diethyl aluminum chloride (DE).
AC) was added at a concentration of 40 mmol, n-propanol was added at a concentration of 44 mmol, and silicon tetrachloride was added at a concentration of 20 mmol (solution A). On the other hand, tri (tridecyl) ammonium molybdate was added to the monomer at a concentration of 10 mmol (Solution B).

Liquids A and B were respectively sent to a power mixer by a gear pump so as to have a volume ratio of 1: 1 and then, in a space of a mold formed by a convex mold and a concave mold, Injection was performed at a mold temperature of 70 ° C. The reaction was carried out in the mold for 3 minutes. These series of operations were performed under a nitrogen atmosphere.

Then, synthetic resin tank moldings 2g and 2h having the shape shown in FIG. 4 (A) were obtained. The wall thickness of these tank molded bodies 2g and 2h was about 9 mm (t ₃ shown in FIG. 1). A flange 4 having the structure shown in FIG. 1 was formed at the open ends of these formed bodies 2g and 2h. Tip 4a of flange 4
Had a wall thickness t ₁ of 12 mm and a wall thickness t ₂ at the base end of about 9 mm. The step S of the second mating surface 8 with respect to the first mating surface 6 was 2 mm.

These tank molded bodies 2g and 2h are attached to an iron plate 4
The tank was constructed by combining between 4 and 46. The height of the tank is about 1500mm, the outer diameter of the tank is about 900mm
Met. The volume of the tank was about 0.75 m ³ . Between the flange 4 and the iron plate 46 of the molded body 2g and between the flanges 4 and 4, an O-ring having a diameter of 8 mm made of butyl rubber was interposed and a urethane-based adhesive was applied. The size of the bolt used for fastening the iron plates 44, 46 and the flange 4 and fastening the flange portions 4, 4 is M12.
And the bolt pitch was 150 mm.

When 1.2 Kg / cm ² of pressurized water was filled in this tank and the sealing property was examined, no leakage occurred anywhere. Example 2 The inside of the tank used in Example 1 was evacuated by a vacuum pump without adding pressurized water to the inside of the tank, and
The pressure was reduced to 0 mmHg.

When the valve was closed and the sealing property of the tank was examined, the depressurized state was maintained and no leakage occurred anywhere. Example 3 Tank moldings 2i and 2j having the same flange 4 as in Example 1 and having the shape shown in FIG. 4 (B) were obtained by the reaction injection molding method similar to the method shown in Example 1.

The longitudinal diameter d1 of the tank is about 1800 mm,
The length b1 of the tank was about 3000 mm. The volume of the tank was about 5 m ³ . An O-ring made of butyl rubber and having a diameter of 10 mm was interposed between the flanges 4 and 4. The size of the bolt used for fastening the flanges 4 and 4 was M10, and the bolt pitch was 150 mm. The same adhesive as in Example 1 was used.

In this tank, pressurized water having a water head H1 of about 1 meter (corresponding to 0.1 kg / cm ² ) is enclosed,
When the sealability was examined, no leakage occurred anywhere. Example 4 A tank molded body 2k, 2l, 2m, 2n, 2o having the same flange 4 as that of the above-mentioned Example 1 and having the shape shown in FIG. 4 (C).
Was obtained by a reaction injection molding method similar to the method shown in Example 1. These tank moldings 2k, 2l, 2m, 2n, 2o
Were joined with flanges 4 and 4 to form a tank.

The longitudinal diameter d2 of the tank is about 2000 mm,
The tank length b2 was about 4000 mm. The volume of the tank was 12 m ³ . An O-ring made of butyl rubber and having a diameter of 12 mm was interposed between the flanges 4 and 4. The size of the bolt used to fasten each flange was M12, and the bolt pitch was 150 mm. The same adhesive as in Example 1 was used.

Pressurized water having a water head H2 of about 1 meter (corresponding to 0.1 kg / cm ² ) is enclosed in this tank,
When the sealability was examined, no leakage occurred anywhere.

[0051]

As described above, according to the present invention, at least the first mating surface formed at the tip of the flange is in close contact with the mating surfaces of the other members. Further, the flange is deformed so that the second mating surface approaches the mating surface of the other member, so that the adhesive agent interposed between the flange and the first mating surface and the second mating surface of the flange is uniformly and well formed. Improves familiarity, adhesion and sealability.

Further, by tightening the flange to another member with the seal member such as packing interposed in the seal member mounting groove of the flange, the seal member is also compressed well as the flange is deformed, and the sealing property is improved. Is further improved. In addition, by forming a convex portion that covers the outer circumference of another flange joined to this flange at the tip end portion of the flange on which the first mating surface is formed, the adhesive that has exuded from the first mating surface can be applied to the flange. It doesn't overflow the perimeter. Therefore, the joint strength of the flange is improved, and the appearance of the flange joint is good.

Further, the molded article having the flange according to the present invention is made of polynorbornene-based resin obtained by reaction injection molding, so that the flange in which the adhesive groove, the seal member mounting groove, the bolt hole, etc. are formed. Can be molded very easily. Further, by forming the flange with a polynorbornene-based resin, it is elastically deformed by the tightening force of the fastening means such as bolts and nuts, and even if it is deformed, cracks do not occur and the strength does not decrease.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view showing a connected state of a molded body having a flange according to an embodiment of the present invention.

FIG. 2 is a schematic cross-sectional view showing a connected state of a molded body having a flange according to another embodiment of the present invention.

FIG. 3 is a perspective view of a septic tank casing manufactured by combining molded bodies having a flange according to still another embodiment of the present invention.

4 (A) to 4 (C) are a sectional view and a side view of a tank manufactured using a molded body having a flange according to an embodiment of the present invention.

[Explanation of symbols]

 2, 2a to 2o ... Molded body 4, 40 ... Flange 4a ... Tip part 6 ... First mating surface 8 ... Second mating surface 10 ... Adhesive groove 12 ... Seal member mounting groove 14 ... Adhesive 16 ... Packing 18 ... Bolt 20 ... Nut

Claims (3)

[Claims] 1. A molded product having a flange provided with a step so that a first mating surface of a front end portion of the flange projects more than a second mating surface of a base end portion of the flange. 2. An adhesive groove recessed inward from the mating surfaces is formed between the first mating surface at the tip of the flange and the second mating surface at the base of the flange. A molded product having the flange according to Item 1. 3. The molded product having a flange according to claim 2, wherein a recessed seal member mounting groove is formed between the adhesive groove and the second mating surface.