JPH09164598A - Bonding method of ethylene resin pipes or sheets, bonding structure and adhesive member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten a bonding time to enhance bonding workability by inserting the leading end part of a pipe having a specific adhesive member attached thereto into the expanded receiving port molded to the leading end of an ethylenic resin pipe to be bonded to subject both pipes to electromagnetic induction bonding. SOLUTION: One ethylenic resin pipe A having an adhesive member 12 attached thereto is inserted into the expanded receiving port 12 of other ethylenic resin pipe B and both pies are held under predetermined pressure. A high frequency induction coil 15 is arranged in the vicinity of the peripheral surface of the bonded part of both ethylenic resin pipes A, B and, when a current of predetermined frequency is applied to the coil for a predetermined time, magnetic hysteresis loss is generated in the magnetic powder mixed with the adhesive member 12 and the metal fibers mixed with the adhesive member 12 generate heat by the iron loss caused by a high frequency current. By the generated heat, the ethylenic resin polymerized by the metallocene catalyst in the adhesive material 12 is melted and a molten part and a melting-into part are formed to the inner and outer peripheral surfaces of both resin pipes to bond both pipes.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joining method of welding ethylene resin pipes or sheets to each other via an adhesive member, a joining structure thereof, and an adhesive member. In particular, the present invention relates to a simple joining method for bringing an ethylene-based resin pipe, a sheet or the like to a construction site and joining them on the spot, a joining structure thereof, and an adhesive member. Further, the present invention provides an adhesive member by means of a high-frequency current flowing through a high-frequency induction coil arranged at the above-mentioned joining portion via an adhesive member in which an ethylene-based resin, magnetic powder and metal fibers are kneaded between ethylene-based resin pipes or sheets. The present invention relates to a method for joining ethylene resin pipes or sheets, in which hysteresis loss is generated in the magnetic powder therein, and heat is generated due to iron loss of the metal fibers so that the ethylene resins are welded to each other, the joining structure thereof, and an adhesive member. is there. In the present specification, the term “adhesive member” refers to a magnetic material that heats itself by a high-frequency induced current, and a metal fiber mixed with a synthetic resin member. It means that the resin member is heated and melted, and at the same time, a part of the members to be bonded is melted.

[0002]

2. Description of the Related Art A method for welding plastic members uses an adhesive which chemically changes the material, a dielectric heating using high frequency, and an adhesive member containing ferromagnetic fine powder which absorbs electromagnetic energy. High-frequency induction heating. For example, using high-frequency induction heating,
There is Japanese Patent Application Laid-Open No. 6-278221. In the method for joining ethylene-based resin pipes described in the above publication, the periphery of the butted portion of the ethylene-based resin pipes that are to be butted and are to be joined is covered with a coaxially fitted joint. The joint has a mesh-shaped heater made of a magnetic alloy embedded in the inner surface thereof. And around the joint,
A work coil connected to a high frequency power supply is provided. By applying a high frequency current to the work coil, the mesh heater is heated by high frequency induction,
The outer peripheral surface of the ethylene-based resin pipe and the inner peripheral surface of the joint are melted and joined.

Another example is shown in FIG. FIG. 4 is a diagram for explaining a method of joining synthetic resin pipes in a conventional example. In FIG. 4, the synthetic resin pipes A ′ and B ′ are held by the fixing means (not shown) in a state where they are butted against each other at their end faces 41. A joint 42 is coaxially fitted in the vicinity of the abutting end faces 41 of the synthetic resin pipes A ′ and B ′. The magnetic alloy body 43 is embedded in the hot melt resin on the inner peripheral surface of the joint 42. Further, a high frequency induction coil 44 embedded by a high frequency induction coil holding member 45 so as to be coaxial with the synthetic resin pipes A ′ and B ′ is disposed around the joint 42. The high frequency induction coil 44 is connected to a high frequency power source (not shown), and a water cooling pipe 46 for preventing the high frequency induction coil 44 from being overheated is provided.

When a current is applied to the high frequency induction coil 44 from the high frequency power source in such a state, the magnetic alloy body 43 provided on the inner surface of the joint 42 generates heat due to electromagnetic induction. Due to this heat generation, the outer peripheral surfaces of the synthetic resin pipes A ′ and B ′ and the inner peripheral surface of the joint 42 are melted, and the two pipes are joined together. The melting of the joint 42 portion causes the joint 42 to be deformed or melted to cause the joint 42.
The shield member 47, as shown in the drawing, prevents any of the synthetic resin pipes A ′ and B ′ from flowing out.
It is provided at multiple locations. That is, the shield member 4
Since the magnetic alloy body 43 in the lower part of 7 is not heated and melted, the joint 42 of this portion does not deform, and the joint 42 and the synthetic resin pipe A ′ melted from this portion are not deformed.
A part of B'will not flow out.

[0005]

However, Japanese Patent Laid-Open No. 6-2 / 1994
The joint described in Japanese Patent No. 782111 requires an embedded heater in a mesh shape, and is expensive. Especially,
For synthetic resin pipes, the thickness of the heater to be embedded in the joint and the distance between meshes must be adjusted depending on the material, thickness, thickness, etc., so water pipes, gas pipes, or sewer systems that are often joined at the site It cannot be applied to pipes, etc. Also paragraph

[0003] and paragraphs

[0004] The conventional example described in the above has the drawback that unless the magnetic alloy body and the shield member are provided in the joint, the joint is deformed or the melted member flows out, and the joint itself is expensive. It will be. The above-described method is not only difficult to perform at a work site because of a long heating and melting time and a long holding time for cooling and solidification, and also has poor working efficiency. Conventionally, since heat is generated in the joint by electromagnetic induction heating, the adhesive member in which soft ferrite is kneaded has a limit in the amount of heat generated even when the soft ferrite kneading limit is increased to 60% by weight. The joining member could not be welded in a short time.

The present invention is intended to solve the above problems, and shortens the joining time of ethylene resin pipes by using an adhesive member obtained by kneading ethylene resin, soft ferrite and metal fiber. In addition, it is an object of the present invention to provide a method for joining an ethylene resin pipe and a sheet, which improves the workability of joining, a joining structure thereof, and an adhesive member.

[0007]

[Means for Solving the Problems]

(First Invention) A method for joining an ethylene resin pipe according to the present invention is to weld an ethylene resin pipe with an adhesive member. The ethylene resin polymerized by a metallocene catalyst, magnetic powder, and metal fibers are kneaded. Attaching the adhesive member 12 formed into a fixed shape to the outer circumference of the tip end of one ethylene resin pipe A to be joined, and the enlarged diameter receiving port formed at the tip end of the other ethylene resin pipe B to be joined The step of inserting the tip of one of the ethylene resin pipes A, to which the adhesive member 12 is attached, into 13 and holding both at a predetermined pressure, and around the ethylene resin pipes A and B to be joined. And applying a current of a predetermined frequency for a predetermined time to the arranged high frequency induction coil 15.

(Second Invention) The method for joining ethylene resin pipes according to the present invention is to weld the ethylene resin pipes with an adhesive member, which is polymerized by a joint 22 formed of ethylene resin and a metallocene catalyst. A step of integrally molding the adhesive member 23 obtained by kneading the ethylene resin, the magnetic powder, and the metal fiber, and a step of inserting and holding the tip ends of the ethylene resin pipes A and B to be joined into the joint 22. And a step of applying a current of a predetermined frequency for a predetermined time to the high frequency induction coil 24 arranged around the joints of the ethylene-based resin pipes A and B and the joint 22.

(Third Invention) An adhesive member 12 used in the method for joining ethylene resin pipes according to the present invention, which is obtained by kneading an ethylene resin polymerized with a metallocene catalyst, magnetic powder, and metal fibers into a uniform shape, is used. When the ethylene-based resin pipes A and B are joined together, the ethylene-based resin pipes A and B are formed in a taper shape that substantially coincides with the diameter-enlarging port 13 formed in the ethylene-based resin pipe B.

(Fourth Invention) The taper of the adhesive member 12 used in the method for joining ethylene-based resin pipes according to the present invention is such that the axial pressure of the ethylene-based resin pipes A and B is converted into the pressure on the adhesive surface. The feature is that it can be formed.

(Fifth Invention) A method for joining ethylene resin sheets according to the present invention is to weld an ethylene resin sheet with an adhesive member. The ethylene resin polymerized by a metallocene catalyst, magnetic powder, and metal fiber. Arranging the adhesive member 33, which is kneaded and molded into a fixed shape, between the ethylene resin sheets 31 and 32 to be joined, and a high-frequency induction coil arranged on the ethylene resin sheet 31 to be joined. 34, a step of applying a predetermined pressurization after applying a current of a predetermined frequency for a predetermined time.

(Sixth and Seventh Inventions) A metallocene catalyst is used as the ethylene resin to be kneaded with the magnetic powder of manganese / zinc ferrite and the metal fiber, which is the adhesive member in the ethylene resin pipe or sheet of the present invention. It is characterized by comprising an ethylene / α-olefin copolymer having 4 or more carbon atoms and having a melt flow rate of 1 to 10 g / 10 minutes and a density of 0.925 g / cm ³ or less.

(Eighth Invention) The joint structure of an ethylene resin pipe according to the present invention is one ethylene resin pipe A.
And one end of the ethylene resin pipe A, which is molded at the tip
The other ethylene-based resin pipe B having the expanded diameter receiving port 13 into which is inserted, and the high-frequency current flowing through the high-frequency induction coil 15 arranged on the joint portion of the above-mentioned ethylene-based resin pipe B. A melting portion 17 which is disposed between A and the other ethylene resin pipe B and is composed of an adhesive member 12 in which an ethylene resin polymerized by a metallocene catalyst, magnetic powder, and metal fibers are kneaded.
And an outer peripheral surface of the ethylene resin pipe A on one side and an inner peripheral surface of the ethylene resin pipe B on the other side are melted together with the melted portion 17 of the adhesive member 12 into a melted portion 17 ', 1
7 ″.

(Ninth Invention) The joint structure of the ethylene resin pipe according to the present invention has a joint 22 made of ethylene resin for connecting the ethylene resin pipe A and the ethylene resin pipe B, and the ethylene resin pipe. The high-frequency current flowing in the high-frequency induction coil 24 arranged on the joint 22 for joining A and B causes the ethylene-based resin pipe A,
Of the ethylene-based resin polymerized by the metallocene catalyst, the magnetic powder, and the adhesive member 23, which is kneaded with the metal fiber, and the ethylene-based resin pipes A and B. It is characterized in that the outer peripheral surface and the inner peripheral surface of the joint 22 are composed of melted portions 27 ′ and 27 ″ which are melted together with the melted portion 27 of the adhesive member 23.

(Tenth and Twelfth Inventions) As the adhesive members 12, 23 and 33 in the joining structure of the ethylene resin pipes A and B or the sheets 31 and 32 of the present invention, the above-mentioned magnetic powder of manganese and zinc ferrite is kneaded. The ethylene-based resin to be used is an ethylene / α-olefin copolymer having a melt flow rate of 1 to 10 g / 10 minutes and a density of 0.925 g / cm ³ or less, which is produced using a metallocene catalyst. It is characterized by

(Eleventh Invention) The bonding structure of the ethylene-based resin sheet of the present invention is one of the ethylene-based resin sheet 31.
And a high-frequency current flowing in a high-frequency induction coil 34 arranged on the joining portion of the ethylene-based resin sheet 31 and the ethylene-based resin sheet 32, which is partially joined to the one ethylene-based resin sheet 31, One ethylene-based resin sheet 31 and the other ethylene-based resin sheet 32
And a melting portion 36, which is provided between the ethylene resin polymerized by a metallocene catalyst, magnetic powder, and an adhesive member 33 in which metal fibers are kneaded, and the upper surface of one ethylene resin sheet 31 and the other. Ethylene resin sheet 3
The lower surface of 2 is composed of the melted portions 36 ′ and 36 ″ which are melted together with the melted portion 36 of the adhesive member 33.

(Thirteenth Invention) The adhesive member of the present invention is an electromagnetic induction hot melt member formed by kneading an ethylene resin polymerized by a metallocene catalyst, magnetic powder, and metal fibers into a predetermined shape or a sheet shape. 12, 2
3, 33 and the electromagnetic induction hot melt members 12, 2
3, 33, and an adhesive layer provided on at least a part of one surface.

(Fourteenth Invention) In the adhesive member of the present invention, the ethylene resin forming a part of the electromagnetic induction hot melt member is produced by using a metallocene catalyst and has a melt flow rate of 1 to 10 g / 10 min. , The density is 0.
Ethylene at 925 g / cm ³ or less α-C4 or more
It is characterized by comprising an olefin copolymer.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION The present applicant has noticed that an ethylene resin polymerized by a metallocene catalyst has a small temperature difference between the Vicat softening point and the melting point. That is, the applicant of the present invention has noticed that the temperature difference and the melting point as described above are low when the ethylene resin polymerized by the metallocene catalyst is compared with a general ethylene resin. As a result, the adhesive member obtained by kneading the magnetic powder and the metal fiber in the ethylene resin polymerized by the metallocene catalyst requires less heating and melting time and holding time for cooling and solidifying than the adhesive member made of a general ethylene resin. At the same time, there is no deformation of the joint or the adhered member and no outflow of the member. Further, the “melting part” and the “melting part” in the present invention do not represent a melted state or a melted state, but a result obtained by melting or a result obtained by melting the ethylene resin and the adhesive member with each other. .

(First Invention and Eighth Invention) The adhesive member for joining the ethylene resin pipe is formed by kneading the ethylene resin polymerized by the metallocene catalyst, the magnetic powder and the metal fiber into a fixed shape. After that, the molded adhesive member is attached to the outer periphery of the tip end portion of one ethylene resin pipe to be joined. To attach the ethylene resin pipe and the adhesive member, in addition to fitting the molded adhesive member to the ethylene resin pipe, use another adhesive agent on at least one side in advance, thermocompression bonding, welding, or coating / It can also be dried. On the other hand, the other ethylene-based resin pipe to be joined has a diameter-enlarging port formed at its tip. Then, one of the ethylene-based resin pipes to which the adhesive member is attached is inserted into the enlarged-diameter receiving port of the other ethylene-based resin pipe, and both are held at a predetermined pressure.

A high-frequency induction coil is arranged near the joint surface of both ethylene resin pipes, and a current of a predetermined frequency is applied for a predetermined time. When a high-frequency current is applied to the high-frequency induction coil, magnetic hysteresis loss occurs in the magnetic powder kneaded in the adhesive member, and the magnetic powder generates heat. Further, the metal fibers kneaded in the adhesive member generate heat due to iron loss due to the high frequency current.
These heats melt the ethylene resin polymerized by the metallocene catalyst of the adhesive member, and the outer peripheral surface of one ethylene resin pipe and the inner peripheral surface of the other ethylene resin pipe are also melted. A part is created and the two are joined. At the time of this bonding, the ethylene-based resin polymerized by the metallocene catalyst has a small difference between the Vicat softening point and the melting point, so that the heating and melting time and the cooling and solidifying holding time are shortened, and highly reliable bonding becomes possible. It was

(Second and Ninth Inventions) The ethylene resin, the magnetic powder, and the metal fibers polymerized by the metallocene catalyst are kneaded to form an adhesive member, which is integrally molded on the inner peripheral surface of the joint, for example. . For attachment of the adhesive member, any means other than integral molding can be used. Next, the tip ends of the ethylene-based resin pipes to be joined are arranged so as to be joined at the central portion of the joint, and are held so as not to shift for a predetermined time. After that, the ethylene-based resin pipe to be joined and the high-frequency induction coil arranged around the joint are applied with a current of a predetermined frequency for a predetermined time, and the magnetic powder in the adhesive member provided inside the joint and Heat the metal fibers. By heating the magnetic powder and the metal fibers, the ethylene-based resin polymerized by the metallocene catalyst, the outer peripheral surfaces of both ethylene-based resin pipes, and the inner peripheral surface of the joint are melted to form a welded portion, and are integrally joined. It

(Third Invention) An adhesive member obtained by kneading an ethylene resin polymerized by a metallocene catalyst, magnetic powder, and metal fibers is formed into a taper shape. It is assumed that the taper of the adhesive member substantially coincides with the enlarged diameter receiving port formed in the ethylene-based resin pipe when joining the ethylene-based resin pipes. The tapered adhesive member,
By using it as a molded member, it can be cut to a required length and inserted into the tip of one of the ethylene resin pipes at the site of joining the ethylene resin pipes. afterwards,
By applying a current to the high frequency induction coil, the magnetic powder and metal fiber in the adhesive member are heated, and the ethylene resin polymerized by the metallocene catalyst and the ethylene resin pipes are heated and melted, and the melted portion is removed. Formed and bonded together.

(Fourth Invention) Since the above-mentioned adhesive member is formed in a taper shape, when one ethylene resin pipe is inserted into the expanded diameter receiving port of the other ethylene resin pipe, one ethylene resin pipe is inserted. The pressure applied in the axial direction of the resin pipe can be converted into the pressure applied to the adhesive surface. The pressure applied to the adhesive member can further improve the reliability of joining the two ethylene resin pipes.

(Fifth and eleventh inventions) An adhesive member for joining a part of ethylene resin sheets is
The ethylene-based resin polymerized by the metallocene catalyst, the magnetic powder, and the metal fiber are kneaded to be molded into a sheet shape close to the joint. Next, the adhesive member is arranged between the ethylene resin sheets to be joined. The adhesive member is preliminarily formed into a sheet shape, or is arranged on a portion to be adhered by adhesion, welding, coating, drying or the like. Then, the high frequency induction coil is arranged on the ethylene resin sheets to be joined, which are partially overlapped, and a current having a predetermined frequency is applied to the high frequency induction coil for a predetermined time. By applying the high-frequency current, the magnetic powder and the metal fibers of the adhesive member are heated, and the ethylene-based resin polymerized by the metallocene catalyst of the adhesive member is also heated. By heating the adhesive member, the upper surface and the lower surface of the ethylene resin sheet are melted to form a welded portion together with the adhesive member.

(The sixth and seventh inventions, the tenth invention,
The twelfth invention, the fourteenth invention) The present applicant has prepared a melt flow rate of 1 to 1 using a metallocene catalyst.
When studying an ethylene-based resin consisting of an ethylene / α-olefin copolymer having 4 or more carbon atoms and a density of 0 g / 10 min and a density of 0.925 g / cm ³ or less, there was a difference between the Vicat softening point and the melting point. Therefore, it was discovered that when used as an adhesive member, the heating and melting time and the holding time for cooling and solidification are short. Therefore, the present applicant has developed an adhesive member that combines the above resin member with magnetic powder of manganese / zinc ferrite and metal fibers, and succeeded in joining the ethylene resin pipe and the sheet in a short time. Further, according to the present invention, by using the adhesive member, it is possible to prevent the adhesive member and the adhered portion from flowing out and deforming.

(Thirteenth Invention) An adhesive member is formed by kneading an ethylene resin polymerized by a metallocene catalyst, magnetic powder, and metal fibers into a taper shape, a shape suitable for a joint, or a sheet shape. Thus, the magnetic powder and the metal fibers inside are heated by the electromagnetic induction to form an electromagnetic induction hot melt member. An adhesive layer is provided on at least a part of one surface of the electromagnetic induction hot melt member. Such an adhesive member can be accurately and easily attached around the ethylene resin pipe or at a predetermined position such as an ethylene resin sheet by the pressure-sensitive adhesive layer.

[0028]

[Embodiment] FIG. 1 (a) is a view for explaining an outline of an embodiment of the present invention in which ethylene-based resin pipes are joined together. FIGS. 1B and 1C are views for explaining before and after joining at the joining portion. In addition,
1A to 1C, the tip of the ethylene-based resin pipe is exaggeratedly drawn. FIG. 1 shows a joint portion between an ethylene-based resin pipe A and an ethylene-based resin pipe B. The ethylene-based resin pipe A is used for a tubular member such as a water pipe, a gas pipe, or a sewer pipe, for example, and an adhesive member 12 is provided on the outer peripheral surface of a tip portion 11 thereof.

The above-mentioned adhesive member 12 is made by kneading manganese / zinc ferrite and metal fibers, which will be described later, and an ethylene-based resin polymerized by a metallocene catalyst, and is made into a sheet shape or a ring shape. It is shaped into a tapered taper. The metal fibers are, for example, iron, copper, aluminum, and alloys thereof (for example, stainless steel, brass), and the aspect ratio (length / diameter) ... 10 to 400, and the length thereof is 3
mm or 6 mm with a diameter of about 100 μm. The manganese / zinc ferrite and the metal fibers were compounded as follows. Metal fiber: 5 to 25 wt% manganese / zinc ferrite: 20 to 45 wt% total: 30 to 50 wt% metal fiber / total ratio: 1/10 to 5/10

The above-mentioned adhesive member 12 can be attached as a molded product as shown in the drawing at the joining site of the ethylene resin pipe. Furthermore, the adhesive member 12 is
It can be attached in advance to the tip of the ethylene-based resin pipe in a production plant by means such as adhesion, welding, coating, and drying. Ethylene resin pipe B
Has a diameter-enlarging port 13 at the joint. The expanded diameter receiving port 13 is formed so as to be widened in advance toward the open end portion, and the tip end portion 11 of the ethylene resin pipe A can be inserted therein. Then, after inserting the tip portion 11 of the ethylene-based resin pipe A into the diameter-increasing receiving opening 13 of the ethylene-based resin pipe B, the tip end portion 11 of the ethylene-based resin pipe A and the diameter-increasing receiving opening 13 of the ethylene-based resin pipe B are inserted. Voids 14 may remain between the bottoms.

The adhesive member 12 is formed into a sheet shape or a tapered sheet shape, and then an adhesive layer is formed on at least a part of one surface thereof. As this adhesive layer, a well-known one whose main component is an acrylic resin can be used. Since the adhesive member 12 has the pressure-sensitive adhesive layer, the workability of attachment at the joint portion is improved and the attachment position can be made accurate. The high frequency induction coil 15 is connected to a high frequency power supply 16 that generates a high frequency current (not shown).

It is convenient that the high-frequency power source 16 is portable so that it can be easily carried to the assembly site of the ethylene resin pipes A and B, and the high-frequency induction coil 15 can be disassembled. For example, at the assembly site, as shown in FIG. 1A, in the ethylene-based resin pipes A and B, the tip portion 11 and the bottom portion of the expanded diameter receiving port 13 are substantially brought into contact with each other by holding means (not shown). . After that, the high frequency induction coil 15 is assembled on the contact portion. When a high-frequency current is applied to the high-frequency induction coil 15, the two ethylene-based resin pipes A and B are connected to each other as shown in FIG.
As shown in (c), the melted portion 17 of the adhesive member 12 and the melted-in portions 17 ', 17 "for melting the ethylene resin pipes A, B and the adhesive member 12 are formed and joined to each other. The induction coil 15 is disassembled and removed from the joint.

When a high frequency current is applied from the high frequency power source 16 to the high frequency induction coil 15 in the state shown in FIG. 1A, the manganese / zinc ferrite mixed in the adhesive member 12 has a hysteresis loss, and the metal fiber is iron. The loss causes heat generation, and the ethylene-based resin polymerized by the metallocene catalyst is heated. Then, the heated adhesive member 12 melts the ethylene resin pipes A and B, and the two ethylene resin pipes A and B are joined together. FIG.
(B) is a state before the ethylene resin pipes A and B are held in a predetermined state and a current is supplied from the high frequency power supply 16 to the high frequency induction coil 15. FIG. 1C is a diagram showing a molten state of the adhesive member and the ethylene resin pipes A and B after being heated by the hysteresis loss of manganese / zinc ferrite and the iron loss of the metal fiber. That is,
The ethylene-based resin polymerized by the metallocene catalyst has a molten portion 17 formed first by heating manganese-zinc ferrite and metal fibers, and then the outer peripheral surface of the ethylene-based resin pipe A and the inner peripheral surface of the ethylene-based resin pipe B. The surfaces are heated and melted with each other, and the melted portions 17 ', 1
7 ″ is formed.

After inserting the ethylene-based resin pipe A into the diameter-enlarging port 13 of the ethylene-based resin pipe B, a high-frequency current is applied to the one ethylene-based resin pipe A while applying a pressure to the ethylene-based resin pipe A by a holding means (not shown). Induction coil 1
5 is applied. At this time, since the diameter-enlarging port 13 and the adhesive member 12 of the ethylene-based resin pipe B are tapered with respect to each other, the pressure applied from the axial direction of the ethylene-based resin pipes A and B is applied to the adhesive surface. Can be converted to. Therefore, the pressure applied to the ethylene-based resin pipes A and B makes the joining even stronger.

FIG. 2 (A) is a view for explaining another example of the present invention in which an ethylene-based resin pipe is joined by using a joint. FIG. 2B is a diagram for explaining a state in which the ethylene-based resin pipe is joined by a joint. In FIG. 2, an ethylene resin pipe A
The joint 21 between the distal ends of the ethylene-based resin pipes B is covered by a joint 22 having an adhesive member 23 provided on the inner peripheral surface. A high frequency induction coil holding member 25 in which the high frequency induction coil 24 is embedded is coaxially provided on the upper peripheral surface of the joint 22 at a predetermined interval. The high frequency induction coil 24 is the high frequency induction coil 2.
In order to suppress heat generation of No. 4, the water-cooled pipe 26 has a hollow conductor.

The adhesive member 23 can be attached in advance as a ring-shaped molded product to the inner peripheral surface of the joint 22 by means such as adhesion, welding, or application / drying. The adhesive member 23 is the same as the adhesive member 12 described in FIG. Ethylene resin pipe A,
B is held by a holding means (not shown) in the state of FIG. 2A, and a current is supplied from the high frequency power supply 16 to the high frequency induction coil 15. In FIG. 2B, the manganese / zinc ferrite and the metal fiber are heated by the high frequency induction magnetic field, and then the ethylene resin polymerized by the metallocene catalyst forms the melted portion 27, and then the heat of the melted portion 27 causes The ethylene-based resin pipes A and B are melted with each other, and melt-in portions 27 ', 27 "
Is formed.

FIG. 3A is a view for explaining an example of another embodiment of the present invention in which an adhesive member is inserted into the joining portion of the ethylene resin sheet and joined. FIG. 3B is a diagram for explaining a state where the ethylene-based resin sheets are bonded to each other by the adhesive member. In FIG. 3A, for example, the tip portions of the ethylene resin sheet 31 and the ethylene resin sheet 32 such as the water blocking sheet are partially overlapped with each other, and the adhesive member 33 is provided therebetween. It is provided. Then, the high frequency induction coil 3 is provided on the upper surface of the joining portion at a predetermined interval.
A high frequency induction coil holding member 35 in which 4 is embedded is provided. The high frequency induction coil 34 may be provided with a water cooling pipe (not shown) in order to suppress heat generation of the high frequency induction coil 34, or the water cooling pipe itself may be used as a coil.

The adhesive member 33 is formed in advance in the form of a rectangular sheet, for example, and is attached to one of the sheets by means such as adhesion, welding, or application / drying. The adhesive member 33 is the same as the adhesive member 12 described in FIG. The ethylene-based resin sheets 31 and 32 are held by a holding unit (not shown) in the state of FIG. 3A, and a high frequency power supply (not shown) supplies a current to the high frequency induction coil 34. In FIG. 3B, the manganese / zinc ferrite and the metal fibers in the adhesive member 33 are sequentially heated by moving a high frequency induction magnetic field as needed. The heated manganese / zinc ferrite and the metal fibers melt the ethylene-based resin polymerized by the metallocene catalyst to form the melting portion 36, and then the melting portion 3
The heat of 6 melts the ethylene-based resin sheets 31 and 32 to each other to form welded portions 36 ′ and 36 ″.

Next, the heating and melting time and the cooling and solidifying time according to the above-mentioned Examples and Comparative Examples will be compared. [Example 1] In Example 1, an ethylene resin polymerized by a metallocene catalyst [manufactured by Tosoh (4P-087Y),
(Vicat softening point 110 ° C, melting point 115 ° C)],
Manganese and zinc ferrite [manufactured by Toda Kogyo (BSF54
7)], and metal fibers (stainless steel, fiber length 3 m
m, diameter 100 μm (manufactured by Rainbow Technology)

[Table 1] After kneading at a mixing ratio as shown in, a sheet-like adhesive member having a thickness of 0.4 mm was formed. The ethylene resin pipe A has a tip having an outer diameter of 90 mm and an inner diameter of 75 mm. The ethylene resin pipe B had a diameter-increasing port with an outer diameter of 108 mm and an inner diameter of 94 mm. The high frequency induction coil arranged at the joint of both ethylene-based resin pipes had 5 turns, an outer diameter of 110 mm, and a high frequency power source of 800 KHz and 2.5 KW.

[0040]

[Table 1] is for explaining the bonding state when the content of manganese / zinc ferrite, the content of stainless fiber, and the induction heating time are changed. In the table, ○ indicates that the bonding state is good, × indicates that burning occurred, joining was impossible, or peeling occurred.

As shown in Table 1, when stainless steel fibers are put in the adhesive member, the induction heating time can be shortened, but a good joined state cannot be obtained. Further, it can be seen that when the adhesive member is only manganese / zinc ferrite as in the conventional case, the induction heating time is very long in order to obtain a good joined state.

Example 2 In Example 2, the thickness is 1.5 mm.
Ultra-low density ethylene resin (VLDEP) and ethylene-propylene rubber (EPDM) with a thickness of 1.5 mm are joined together.

[Table 2] The water blocking sheet was welded using the adhesive member having the content of the ratio shown in. At that time, the frequency of the high frequency power supply is
The electromagnetic induction coil having a number of turns of 800 KHz, 2.5 KW, 5 turns and an outer diameter of 50 mm was used.

[Table 2] shows the mixing ratio of manganese / zinc ferrite and stainless fiber in the adhesive member. Also,

[Table 3] Is

The heating and melting time when the adhesive member shown in Table 2 is used is compared between the comparative example and the example.

Table 3 shows that in the case of the example, the bonding time is shorter than that of the comparative example.

Next, the ethylene resin polymerized by the metallocene catalyst will be described. The ethylene resin polymerized by a metallocene catalyst has recently been attracting attention as a material excellent in light weight, transparency, tensile resistance, impact resistance and the like. For example, an ethylene resin polymerized by a metallocene catalyst has a melt flow rate of 1 to 10
An α-olefin copolymer having a density of 0.925 g / cm ³ or less and ethylene / carbon number of 4 or more is produced in g / 10 minutes.

Although the embodiments of the present invention have been described in detail, the present invention is not limited to the above embodiments. And
Various design changes can be made without departing from the invention as set forth in the appended claims. For example, although the ethylene resin pipe has been described in the embodiment, it is needless to say that the present invention is not limited to the pipe and can be applied to joining molded products having sheet shapes and various shapes. In this case, the shape of the bonding member changes depending on the easiness of making the enlarged diameter receiving port or the easiness of making the joint. Therefore, the adhesive member is formed into a sheet shape, a tapered sheet, a ring shape, or a thickness and shape suitable for the shape of a molded product. In addition, ethylene-based resin polymerized with a metallocene catalyst and manganese
The mixing ratio with zinc ferrite can be arbitrarily changed depending on the members to be joined.

In the embodiment, the joining of the two ethylene resin pipes has been described, but the ethylene resin pipes can be connected in a "T" shape. In this case, the shape of the joint is made “T” shape, and the ethylene-based resin pipes are sequentially inserted from three directions, and the high-frequency induction coils are joined while being moved one by one. Further, in the embodiment, a pipe-shaped joint is shown, but a projection serving as a stopper may be formed at the center of the joint to facilitate insertion of a pipe to be joined. That is, the joint can adopt various conventional shapes.

It is convenient that the high-frequency induction coil is easily portable, such as one that can be disassembled and assembled up and down, and one that can be partially disassembled into a shape that is easy to pull out after joining both pipes. However, when the length of the ethylene-based resin pipe is relatively short, the high-frequency induction coil may be spirally continuous. The holding means for the ethylene-based resin pipe can be arbitrarily selected, such as one that can be kept stationary for the heating and melting time and the cooling and solidifying time, or one that can be held while applying some pressure, according to the shape of the joining member. . Although manganese-zinc ferrite is not disclosed in detail, a commercially available product is sufficient.

The ethylene resin sheets may be joined to each other by an elliptical or rectangular shape other than the high frequency induction coil having the shape shown in FIG. In addition, it is possible to improve the workability in a narrow place by forming the shape close to a heating iron. In particular, for workability in a narrow space, the shape of the high frequency induction coil can be deformed in consideration of the shape of the joint. When using a high-frequency induction coil, in a place where the surface of the adhesive member cannot be heated directly by the heating iron, or where it is difficult to move the heating iron,
It is valid. Further, in the examples, only the pipe and sheet of the thermoplastic resin have been described, but other molding extrusion molded products, injection molded products, or joining of leather, wood or the like is also possible.

[0047]

EFFECTS OF THE INVENTION According to the present invention, the characteristics of the ethylene-based resin polymerized by the metallocene catalyst, particularly the adhesive member that skillfully uses the difference between the Vicat softening point and the melting point, allows the ethylene-based resin pipes to be connected in a short time. Moreover, reliable bonding is now possible. According to the present invention, a molded product obtained by kneading an ethylene-based resin polymerized by a metallocene catalyst, manganese / zinc ferrite, and a metal fiber as an adhesive member can be easily attached or attached to a joint. Became. The above-mentioned adhesive member is not only easy to manufacture, but since molding technology and technology for adhering to the joining member have been established, it is possible to simplify the joining work at the assembly site of water pipes, gas pipes, and sewer pipes. , Was able to improve efficiency.

According to the present invention, since good joining can be performed between ethylene resin pipes or sheets in a shorter time than in the conventional case, there is no deformation at the joining portion or outflow of the melted member, so that the reliability is high. It was According to the present invention, since manganese-zinc ferrite and metal fibers are kneaded in the adhesive member, good joining can be achieved without local overheating due to the metal fibers. According to the present invention, since the pressure-sensitive adhesive layer is formed on at least a part of the adhesive member, workability for attaching to a place to be joined is good, and the attaching position can be also accurate.

[Brief description of the drawings]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1A is a view for explaining an outline when joining ethylene resin pipes in one embodiment of the present invention. (B) and (c) are diagrams for explaining before and after joining at the joining portion.

FIG. 2A is a view for explaining another example of the present invention, in which an ethylene-based resin pipe is joined using a joint to a joint thereof. (B) is a diagram for explaining a state in which the ethylene-based resin pipe is joined by a joint.

FIG. 3A is a view for explaining another example of the present invention, in which an adhesive member is inserted into a joint portion of an ethylene-based resin sheet and joined. (B) is a figure for demonstrating the state in which the ethylene resin sheets are mutually joined by the adhesive member.

FIG. 4 is a diagram for explaining a method of joining synthetic resin pipes in a conventional example.

[Explanation of symbols]

 A, B ... Ethylene resin pipe 11 ... Tip part 12 ... Adhesive member 13 ... Expanding port 14 ... Void 15 ... High frequency induction coil 16 ... High frequency power supply 17. ..Melting part 17 ', 17 "... Melting part 21 ... Joining part 22 ... Joint 23 ... Adhesive member 24 ... High frequency induction coil 25 ... High frequency induction coil holding member 26 ... -Water cooling pipe 27 ... Melting part 27 ', 27 "... Melting part 31, 32 ... Water blocking sheet 33 ... Adhesive member 34 ... High frequency induction coil 35 ... High frequency induction coil holding member 36 ... Melting part 36 ', 36 "... Melting part

Continuation of front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location // B29K 23:00 B29L 23:00

Claims (14)

[Claims] 1. In a joining method of welding an ethylene resin pipe with an adhesive member, an adhesive member formed by kneading an ethylene resin polymerized by a metallocene catalyst, magnetic powder, and metal fibers to form a uniform shape should be joined. The step of attaching to the outer periphery of the tip of one ethylene resin pipe, and the one of the ethylene resin pipe to which the adhesive member is attached to the expanded diameter receiving port formed at the tip of the other ethylene resin pipe to be joined The step of inserting the tip of the two and holding them at a predetermined pressure, and the step of applying a current of a predetermined frequency for a predetermined time to a high-frequency induction coil arranged around the ethylene-based resin pipes to be joined, A method for joining ethylene-based resin pipes comprising: 2. A joining method for welding an ethylene-based resin pipe with an adhesive member, comprising: a joint formed from the ethylene-based resin; and an adhesive member obtained by kneading the ethylene-based resin polymerized by a metallocene catalyst, magnetic powder, and metal fibers. The step of integrally molding, the step of inserting and holding the tip of the ethylene-based resin pipe to be joined into the joint, and the high-frequency induction coil arranged around the joint of the ethylene-based resin pipe and the joint. And a step of applying an electric current of the frequency of for a predetermined time, and a method for joining ethylene-based resin pipes. 3. An adhesive member obtained by kneading an ethylene-based resin polymerized by a metallocene catalyst, magnetic powder, and metal fibers to form a uniform shape, when the ethylene-based resin pipes are joined to each other. The method for joining an ethylene-based resin pipe according to claim 1, characterized in that the ethylene-based resin pipe is formed in a taper shape that is substantially coincident with the formed expanded diameter receiving port. 4. The ethylene resin pipe according to claim 1, wherein the taper of the adhesive member has a shape capable of converting an axial pressure of the ethylene resin pipe into a pressure applied to the adhesive surface. Joining method. 5. A joining method of welding an ethylene resin sheet with an adhesive member, wherein an ethylene resin polymerized by a metallocene catalyst, magnetic powder, and metal fibers are kneaded to join an adhesive member formed into a fixed shape. The step of arranging between the ethylene resin sheets to be joined and applying a predetermined pressure after applying a current of a predetermined frequency for a predetermined time to the high frequency induction coil placed on the ethylene resin sheets to be joined. A method for joining ethylene-based resin sheets, which comprises the steps of: 6. The ethylene-based resin to be kneaded with the magnetic powder of manganese / zinc ferrite and the metal fiber as the adhesive member is produced by using a metallocene catalyst.
^3. An ethylene / α-olefin copolymer having 4 or more carbon atoms having a melt flow rate of 1 to 10 g / 10 minutes and a density of 0.925 g / cm ³ or less. Method for joining ethylene resin pipes. 7. The ethylene-based resin to be kneaded with the magnetic powder of manganese / zinc ferrite and the metal fiber as the adhesive member is produced by using a metallocene catalyst.
The ethylene-based resin sheet according to claim 5, wherein the ethylene-based resin sheet has a melt flow rate of 1 to 10 g / 10 minutes and a density of 0.925 g / cm ³ or less and an ethylene / α-olefin copolymer having 4 or more carbon atoms. How to join. 8. An ethylene-based resin pipe is joined to one ethylene-based resin pipe and another ethylene-based resin pipe that is formed at the tip and has a diameter-enlarging port into which one of the ethylene-based resin pipes is inserted. By a high-frequency current flowing in a high-frequency induction coil arranged on the section, disposed between one ethylene-based resin pipe and the other ethylene-based resin pipe, ethylene-based resin polymerized by a metallocene catalyst, magnetic powder, And a melting portion formed of an adhesive member in which metal fibers are kneaded, and a melting portion in which the outer peripheral surface of one ethylene resin pipe and the inner peripheral surface of the other ethylene resin pipe are melted together with the melting portion of the adhesive member, A structure for joining ethylene-based resin pipes, which is characterized in that 9. An ethylene-based resin pipe, a joint made of an ethylene-based resin for connecting the ethylene-based resin pipe, and a high-frequency current flowing in a high-frequency induction coil arranged on the joint for joining the ethylene-based resin pipe, A fusion part, which is disposed between the ethylene resin pipe and the joint, is composed of an ethylene resin polymerized by a metallocene catalyst, magnetic powder, and an adhesive member kneaded with metal fibers, and an outer peripheral surface of the ethylene resin pipe. A joint structure for an ethylene-based resin pipe, characterized in that an inner peripheral surface of the joint is composed of a melted portion that is melted together with the melted portion of the adhesive member. 10. The ethylene-based resin to be kneaded with the magnetic powder of manganese / zinc ferrite and the metal fiber as the adhesive member has a melt flow rate of 1 to 10 g / 10 min and a density of 1 to 10 g / 10 min, which is produced by using a metallocene catalyst. The joining structure of an ethylene-based resin pipe according to claim 8 or 9, which is made of an ethylene / α-olefin copolymer having 4 or more carbon atoms of 0.925 g / cm ³ or less. 11. An ethylene-based resin sheet, one ethylene-based resin sheet partly joined to the one ethylene-based resin sheet, and a high-frequency inductor disposed on a joint portion of the ethylene-based resin sheet. An adhesive member, which is disposed between one ethylene-based resin sheet and the other ethylene-based resin sheet by a high-frequency current flowing in the coil, is made by kneading the ethylene-based resin polymerized by the metallocene catalyst, magnetic powder, and metal fiber. And a melted portion in which the upper surface of one ethylene-based resin sheet and the lower surface of the other ethylene-based resin sheet are melted together with the melted portion of the adhesive member. Bonding structure of resin sheet. 12. The ethylene-based resin to be kneaded with the magnetic powder of manganese / zinc ferrite and the metal fiber as the adhesive member is produced by using a metallocene catalyst and has a melt flow rate of 1 to 10 g / 10 minutes and a density of The joining structure of an ethylene-based resin sheet according to claim 11, which is made of an ethylene / α-olefin copolymer having 4 or more carbon atoms of 0.925 g / cm ³ or less. 13. An electromagnetic induction hot melt member formed by kneading an ethylene resin polymerized by a metallocene catalyst, magnetic powder, and metal fibers into a predetermined shape or a sheet, and one surface of the electromagnetic induction hot melt member. An adhesive member comprising: a pressure-sensitive adhesive layer provided on at least a part of the adhesive layer. 14. The ethylene-based resin constituting a part of the electromagnetic induction hot melt member has a melt flow rate of 1 to 10 g / 1, which is produced by using a metallocene catalyst.
The adhesive member according to claim 13, which is made of an ethylene / α-olefin copolymer having a carbon number of 4 or more and having a density of 0.925 g / cm ³ or less at 0 minutes.