CN112628484B

CN112628484B - Self-sealing type composite pipe seal and pipe fitting formed by same

Info

Publication number: CN112628484B
Application number: CN202011143759.7A
Authority: CN
Inventors: 孟怡珑; 孟建军; 孟建云; 廖欣
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-10-23
Filing date: 2020-10-23
Publication date: 2022-12-16
Anticipated expiration: 2040-10-23
Also published as: CN112628484A

Abstract

The invention discloses a self-sealing type composite pipe seal and a pipe fitting formed by the same, comprising at least two sections of mesh pipe frameworks, connecting pieces, an anti-corrosion outer layer and an anti-corrosion inner layer, wherein through holes are uniformly and densely distributed on the surfaces of the mesh pipe frameworks; the anticorrosion outer layer is coated on the outer surfaces of the mesh pipe framework and the connecting piece, and the anticorrosion inner layer is coated on the inner surfaces of the mesh pipe framework and the connecting piece; after the composite pipe is cut off at the connecting piece, the connecting piece per se forms sealing on the hole network framework, the sealing quality strength and the pipeline use safety factor are improved, and compared with the sealing operation after the existing composite pipe is cut off, the secondary transportation work of the pipe can be avoided, the production cost is reduced, and the production efficiency is improved.

Description

Self-sealing type composite pipe seal and pipe fitting formed by same

Technical Field

The invention belongs to the technical field of composite pipes, and particularly relates to a self-sealing type composite pipe seal and a pipe fitting formed by the same.

Background

The steel-plastic composite pipe is made up by using high-quality steel wire mesh or steel plate mesh skeleton as reinforcing layer and making the high-quality steel wire mesh skeleton or steel plate mesh skeleton be covered in the polyethylene plastics by means of extrusion moulding so as to obtain the invented composite pipe with high strength and corrosion resistance.

The steel-plastic composite pipe mainly comprises a steel skeleton polyethylene plastic composite pipe, a steel wire wound polyethylene plastic composite pipe, a steel plate mesh skeleton polyethylene plastic composite pipe and the like. Because the steel skeleton is used as the reinforcing layer of the pipeline, the inner wall and the outer wall are coated with polyethylene plastics and the like, the exposed steel skeleton is arranged on the section surfaces of two ends of the straight pipe after the pipeline is produced according to fixed length, and therefore the end surface needs to be sealed.

The sealing process of the steel-plastic composite pipe produced by the current industry standard mainly comprises the following steps: 1. performing injection molding and sealing on the end part of the pipe by using an injection molding machine; 2. sealing by adopting a butt welding mode; 3. and extruding and heating the inner and outer surfaces of the pipe by adopting inner and outer dies of a sealing machine, so that the plastic on the inner and outer surfaces of the pipe flows to the end face of the pipe to carry out heating sealing.

Regardless of the sealing process, and regardless of the sealing effect, a batch of equipment and manpower are required to be invested, semi-finished products are obtained after the straight pipe is fed, secondary transportation of the pipe and sealing work of a next procedure are required, the semi-finished products after the straight pipe is fed can be changed into qualified finished products, and the assembly line operation of sealing the end of the fed straight pipe in the extrusion production of the steel-plastic composite pipe cannot be realized.

Disclosure of Invention

Aiming at the technical problems, the invention provides a self-sealing type composite pipe seal and a pipe fitting formed by the same, and solves the problems that the seal is required after the existing steel-plastic composite pipe is cut off, and the assembly line operation of sealing the end of a straight pipe on the steel-plastic composite pipe extrusion production line cannot be realized.

In order to achieve the purpose, the invention adopts the technical scheme that:

a self-sealing composite pipe seal comprises at least two sections of mesh pipe frameworks, connecting pieces, an anti-corrosion outer layer and an anti-corrosion inner layer, wherein through holes are densely distributed on the surfaces of the mesh pipe frameworks, slots are formed in the mesh pipe frameworks in the axial direction, two ends of each connecting piece are respectively fixed in the slots of the adjacent mesh pipe frameworks, and each connecting piece is made of a non-metal composite material; the anticorrosion outer layer is coated on the outer surfaces of the mesh pipe framework and the connecting piece, and the anticorrosion inner layer is coated on the inner surfaces of the mesh pipe framework and the connecting piece.

Further, in the self-sealing type composite tube seal, a plurality of slots are formed in the mesh tube framework, the slots are rectangular, and flanges are arranged at the bottoms of the slots; the cross section of the connecting piece is matched with the slot, and the bottom of the connecting piece is provided with a first groove clamped with the flange.

Further, in the self-sealing type composite tube seal, the insertion grooves are annular grooves, at least four embedded grooves are annularly distributed on each annular groove, a boss is arranged in each embedded groove, and first screw holes are formed in the positions of the hole mesh tube framework, which radially correspond to the bosses, and the bosses; the connecting piece is matched with the contour of the slot, a first screw hole is also arranged at the position of the connecting piece corresponding to the first screw hole, and the mesh pipe framework is fixed with the connecting piece by penetrating a bolt into the first screw hole.

Further, the self-sealing type composite tube seal is characterized in that the insertion grooves are cylindrical grooves, the two ends of the connecting piece are cylinders, the mesh tube framework is provided with first semicircular grooves at the cylindrical insertion parts at the two ends of the connecting piece, the thickness of each first semicircular groove is 0.5-1.0mm larger than the diameter of a through hole of the mesh tube framework, and the bottom of each first semicircular groove is 30-40% of the total thickness of the mesh tube.

Further, in the self-sealing composite tube seal, the lower part of the first semicircular groove is provided with a trapezoidal groove, and the taper of 20-30 degrees is formed from the lower part of the trapezoidal groove to the bottom of the mesh composite tube.

Further, foretell compound pipe of mouth of sealing of proclaiming oneself seals, the slot is the cylinder groove, and its axial is equipped with the cylinder platform, and this cylinder platform surface is equipped with the external screw thread, the connecting piece is the cylinder, and its both ends are equipped with can hold the second recess of cylinder platform, are equipped with the internal thread on this second recess surface for the connecting piece can be impressed in the slot and fasten through threaded connection.

Further, in the self-sealing type composite pipe seal, the connecting piece is also sleeved with a gasket and a nut, and after the connecting piece is pressed into the slot, the connecting piece and the mesh pipe framework are fastened by the gasket and the nut.

Further, foretell compound pipe of mouth of sealing of proclaiming oneself mouth, the gasket contains first gasket and second gasket, be equipped with the sawtooth groove on the first gasket, be equipped with the sawtooth on the second gasket, when first gasket and second gasket joint, the sawtooth gomphosis goes into the meshing of sawtooth groove looks, forms the cockscomb structure contact surface that interlocks each other.

Further, foretell compound pipe of self-sealing formula seals, be equipped with the perforating hole on the connecting piece, anticorrosive outer and anticorrosive inlayer are phenolic resin, epoxy, furan resin, polyester resin, polyurethane resin, ethylene resin, perchloroethylene resin, fluorine-containing resin or polyisobutylene rubber.

A pipe fitting comprises the self-sealing type composite pipe seal.

The scheme provided by the embodiment of the invention has the beneficial effects that:

1. after the composite pipe is cut off at the connecting piece, the connecting piece per se forms sealing on the pore network framework, sealing operation is not required to be carried out again after the composite pipe is cut off, the operation is convenient, the use effect is good, the assembly line operation of the straight pipe end port of the steel-plastic composite pipe extrusion production line is realized, meanwhile, the connecting piece is made of a non-metal composite material, and has an anti-corrosion effect after the composite pipe is cut off;

2. the connecting pieces are adopted to fix the adjacent fixed long hole mesh frameworks, so that the parallelism requirement of the welded end surfaces of the hole mesh pipe frameworks can be reduced;

3. compared with the prior fixing mode of the adjacent hole mesh frameworks, the fixing mode of the adjacent hole mesh frameworks has the advantages that the two pipes are welded into a whole without continuously welding the seams of the two fixed long hole mesh frameworks along the circumference, and the welding spots and the welding scars at the welding positions which are protruded are not required to be polished by using a grinding wheel, so that the workload is reduced, and the production efficiency is improved;

4. need not use sealing equipment and welding operation personnel, according to the production of former straight tube technology, every section fixed length hole net pipe skeleton terminal surface seam crossing is fixed with compound connecting piece and is linked integratively, under the straight tube line tractor, the compound connecting piece position of tubular product is sawed and is obtained the fixed length and need not seal off the line back finished product once more, and connecting piece itself forms the sealed back to the hole net skeleton moreover, seals quality intensity and pipeline factor of safety and can improve, and the effect of using is for the compound pipe preferred of tradition.

Drawings

FIG. 1 is a schematic structural view of a self-sealing composite tube seal of embodiment 1 of the present invention;

FIG. 2 isbase:Sub>A cross-sectional view taken along the plane A-A of FIG. 1;

FIG. 3 is a schematic view of the structure of the self-sealing composite tube seal of embodiment 2 of the present invention;

FIG. 4 is a cross-sectional view taken along the plane of FIG. 3B-B;

FIG. 5 is a schematic structural view of a self-sealing composite tube seal of embodiment 3 of the present invention;

FIG. 6 is a cross-sectional view taken along plane C-C of FIG. 5;

FIG. 7 is a schematic view of the structure of the self-sealing composite tube seal of embodiment 4 of the present invention;

FIG. 8 is a cross-sectional view taken along plane D-D of FIG. 7;

FIG. 9 is a schematic structural diagram of the self-sealing composite tube seals of embodiments 4 and 6 of the present invention;

FIG. 10 is a cross-sectional view taken along plane E-E of FIG. 9;

fig. 11 is a cross-sectional view taken along plane F-F of fig. 9.

Reference numerals in the drawings of the specification include: the hole network pipe frame comprises a hole network pipe frame 1, a connecting piece 2, an anticorrosive outer layer 3, an anticorrosive inner layer 4, a slot 5, a flange 6, a first groove 7, an embedded groove 8, a boss 9, a first screw hole 10, a bolt 11, a first semicircular groove 12, a trapezoidal groove 13, a tractor 14, a composite machine head 15, a through hole 16, a second groove 17, a nut 18, a first gasket 19, a second gasket 20, a sawtooth groove 21, sawteeth 22, a cylindrical table 23 and a through hole 101.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. :

referring to fig. 1 to 11: the invention provides a self-sealing type composite pipe seal, which comprises at least two sections of hole mesh pipe frameworks 1, connecting pieces 2, an anti-corrosion outer layer 3 and an anti-corrosion inner layer 4, wherein through holes 101 are uniformly and densely distributed on the surfaces of the hole mesh pipe frameworks 1, slots 5 are axially arranged on the hole mesh pipe frameworks 1, two ends of each connecting piece 2 are respectively fixed in the slots 5 of the adjacent hole mesh pipe frameworks 1, and each connecting piece 2 is made of a non-metal composite material (for example, composite resin such as nylon wires, graphite, silicon oxide or other salt compounds are adopted); the outer anticorrosion layer 3 covers the outer surfaces (the surfaces facing the outer peripheral surfaces of the mesh pipe framework 1) of the mesh pipe framework 1 and the connecting piece 2, and the inner anticorrosion layer 4 covers the inner surfaces (the surfaces facing the inner peripheral surfaces of the mesh pipe framework 1) of the mesh pipe framework 1 and the connecting piece 2.

The production process of the composite pipe comprises the following steps:

firstly, taking out the multi-section fixed long hole mesh pipe framework 1, respectively inserting two ends of a connecting piece 2 into slots 5 at the edges of adjacent fixed long hole mesh frameworks for fixing, and gradually feeding the multi-section fixed long hole mesh pipe framework 1 which is connected into a whole by the connecting piece 2 into a plastic sealing composite machine head 15 under the conveying of a tractor 14 for carrying out the plastic sealing composite molding of an anticorrosive coating.

After the produced straight pipe is cut off at the connecting piece 2, the connecting piece 2 keeps the mesh grid framework inside, and the connecting piece 2 is made of a nonmetal composite material, so that the connecting piece 2 forms sealing on the mesh grid framework 1, and the phenomenon that the mesh grid framework material in the middle layer of the end surface of the pipe is exposed to corrosion is avoided.

Example 1: with reference to FIGS. 1 and 2

A plurality of slots 5 are arranged on the hole mesh pipe framework 1 in the axial direction, the slots 5 are cuboid, and flanges 6 are arranged at the bottoms of the slots 5; the section of the connecting piece 2 is matched with the slot 5, and the bottom of the connecting piece 2 is provided with a first groove 7 clamped with the flange 6; production workman inserts in the slot 5 with 2 tip of connecting piece, forms ascending extrusion force after the flange 6 of 5 bottoms of slot are contradicted to connecting piece 2, continues to push into slot 5 with connecting piece 2, until the flange 6 block of slot 5 to first recess 7 in to accomplish connecting piece 2 and the fixed of mesh pipe skeleton 1. The slot 5 and the connecting piece 2 have simple structure and convenient operation, and can obviously improve the production efficiency.

The fillet setting is carried out to connecting piece 2 tip and flange 6, is the cambered surface contact when connecting piece 2 and flange 6 contact, can weaken the frictional resistance of connecting piece 2 block to slot 5, improves workman's work efficiency.

Or the connecting piece 2 can be arranged into a hook-shaped body (not shown in the figure), and the slot 5 or the surface through hole 101 at the end part of the adjacent hole network management framework 1 is hooked by the connecting piece 2 to realize the fixation of the connecting piece 2 and the adjacent hole network management framework 1; the hook-shaped body structure of the connecting piece 2 is simple to manufacture, and an operator can quickly and efficiently operate when using the connecting piece 2 to fix the adjacent hole mesh pipe framework 1, so that the production cost can be reduced, and the production efficiency can be improved.

Example 2: with reference to fig. 3 and 4

The slot 5 is set to be an annular groove, at least four embedded grooves 8 (four are shown in the attached drawings) distributed in an annular manner are arranged on the annular groove, a boss 9 is arranged in each embedded groove 8, and first screw holes 10 are arranged on the hole mesh pipe framework 1 corresponding to the bosses 9 in the radial direction and on the bosses 9; the connecting piece 2 is matched with the contour of the slot 5, a first screw hole 10 is also arranged at the position of the connecting piece 2 corresponding to the first screw hole 10, and the fixing of the mesh pipe framework 1 and the connecting piece 2 is realized by penetrating a bolt 11 into the first screw hole 10.

During specific assembly, a production worker can integrally place the end part of the connecting piece 2 into the slot 5 for fitting, and then utilize the bolt 11 to penetrate into the hole network pipe framework 1, the connecting piece 2 and the first screw hole 10 on the boss 9 for screwing, so that the integral fixation of the hole network pipe framework 1 and the connecting piece 2 is completed; and then, the mesh pipe framework 1 is sent into a plastic sealing composite machine head 15 by a conveyor, and the mesh pipe framework 1, the connecting piece 2 and the bolt 11 are all subjected to plastic sealing composite molding of the anticorrosive coating.

The slot matching structure of the slot 5 and the connecting piece 2 can adopt a special die and is manufactured by a stamping process, the manufacturing cost is low after mass production, the slot 5 and the connecting piece 2 are annular, a production worker can be embedded once when fixing the adjacent fixed-long-hole mesh pipe frameworks 1 by the connecting pieces 2, and then the hole mesh pipe frameworks 1 and the connecting pieces 2 are fixed by the bolts 11, compared with a distributed slot 5 form, the working strength of the worker can be reduced, and the production efficiency is improved.

Example 3: with reference to FIGS. 5 and 6

The slot 5 is set as a cylindrical slot, two ends of the connecting piece 2 are set as cylinders, and the mesh pipe framework 1 is provided with a first semicircular slot 12 at the cylindrical insertion part at two ends of the connecting piece 2; the thickness of the first semicircular groove 12 is 0.5-1.0mm larger than the diameter of the through hole 101 of the mesh pipe framework 1, the height of the bottom of the first semicircular groove 12 is 30-40% of the total thickness of the mesh composite pipe, the lower part of the first semicircular groove 12 is provided with a trapezoidal groove 13, and the taper of 20-30 degrees is formed from the lower part of the trapezoidal groove 13 to the bottom of the mesh composite pipe; the structural style of the first semicircular groove 12 facilitates the whole connecting piece 2 to be arranged in the slot 5.

More specifically, the width of the bottom edge of the trapezoid groove 13 is 1/2D, the width of the top edge is 1/2D-1.0mm, wherein D is the diameter of a circle of cylinder groove of the connecting piece 2, the diameter of the cylinder groove of the connecting piece 2 is 2.5-4.0 mm larger than the diameter of the through hole 101 of the mesh pipe framework 1, the thickness is not larger than 2.5mm, the width of the cylinder groove of the connecting piece 2 is not larger than 1.0, and the thickness is the same as the thickness of the mesh pipe framework 1.

Example 4: with reference to FIGS. 7 and 8

The slot 5 is designed to be a cylindrical slot, a cylindrical table 23 is arranged in the axial direction of the cylindrical slot, the surface of the cylindrical table 23 is provided with external threads, the connecting piece 2 is a cylinder, two ends of the connecting piece 2 are provided with second grooves 17 capable of accommodating the cylindrical table 23, and the surface of the second grooves 17 is provided with internal threads, so that the connecting piece 2 can be pressed into the slot 5 and fastened through threaded connection; the structural arrangement of the slot 5 and the connecting piece 2 can be manufactured by adopting a stamping process, the manufacturing process is simple, the threaded connection can be formed at last, the threaded connection operation is simple and easy, and the connection is tight.

Example 5: refer to FIG. 11

Compared with the embodiment 4, the difference is that the connecting piece 2 is also sleeved with a gasket and a nut 18, and after the connecting piece 2 is pressed into the slot 5, the connecting piece 2 and the hole mesh pipe framework 1 are fastened by the gasket and the nut 18; the threaded connection is easy to loosen under the action of external force, and the connecting piece and the mesh pipe framework can be further positioned and fastened by additionally arranging the gasket and the nut 18 for fastening, so that the connecting effect is better.

Example 6: with reference to fig. 9, 10 and 11

The difference from embodiment 5 is that the gasket includes a first gasket 19 and a second gasket 20, the first gasket 19 is provided with a saw-toothed groove 21, the second gasket 20 is provided with saw-teeth 22, and the saw-teeth 22 are fitted into the saw-toothed groove 21 to mesh with each other when the first gasket 19 and the second gasket 20 are joined, thereby forming saw-toothed contact surfaces which are staggered with each other.

When the straight pipe has a loosening trend under the action of external force, the sawtooth grooves 21 play a role in limiting the rotation of the fastening nut 18 on the sawteeth 22, the meshing parts of the sawtooth grooves 21 and the sawteeth 22 are not easy to separate, the shockproof effect is good, and after the sawtooth grooves 21 and the sawteeth 22 of the first gasket 19 and the second gasket 20 are meshed, any one of the sawtooth grooves can be quickly replaced after being damaged.

Example 7 referring to FIGS. 8 and 11

Compared with the embodiment, the difference is that the connecting piece 2 is provided with the through hole 16, after the connecting piece 2 is used for placing the adjacent hole network pipe framework 1, and after the anticorrosion composite machine head 15 is used for sealing and molding, the hole network pipe framework 1 and the anticorrosion outer layer 3 and the anticorrosion inner layer 4 on the surface of the connecting piece 2 are fused into a whole, so that after the composite pipe is cut off along the connecting piece 2, the connecting piece 2 and the anticorrosion outer layer 3 and the anticorrosion inner layer 4 fused into a whole jointly form sealing for the hole network pipe framework 1; the sealing strength and the safety factor of the pipeline in use are improved again. The specific anticorrosive outer layer 3 and anticorrosive inner layer 4 are made of any one of phenolic resin, epoxy resin, furan resin, polyester resin, polyurethane resin, vinyl resin, perchloroethylene resin, fluorine-containing resin and polyisobutylene rubber, for example: the polyethylene terpolymer outer layer and the polyethylene terpolymer inner layer are adopted, and the materials have certain mechanical strength, strong corrosion resistance to acid, alkali, salt, water and other media, and have the characteristics of certain water resistance, oil resistance, wear resistance, adhesive force, toughness and electric insulation.

A tube comprising the self-sealing composite tube seal described in the above embodiments.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. It should be understood, however, that the detailed description and the accompanying drawings are not intended to limit the invention to the particular form disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.

The above description is only a preferred embodiment of the present invention, and all equivalent changes made within the scope of the claims of the present invention should be covered by the claims of the present invention. The parts not involved in the present invention are the same as or can be implemented using the prior art.

Claims

1. The utility model provides a seal from compound pipe of formula of sealing which characterized in that: the anti-corrosion device comprises at least two sections of mesh pipe frameworks (1), connecting pieces (2), an anti-corrosion outer layer (3) and an anti-corrosion inner layer (4), wherein through holes (101) are densely distributed on the surfaces of the mesh pipe frameworks (1), slots (5) are axially arranged on the mesh pipe frameworks (1), two ends of each connecting piece (2) are respectively fixed in the slots (5) of the adjacent mesh pipe frameworks (1), and each connecting piece (2) is made of a non-metal composite material; the anticorrosion outer layer (3) is coated on the outer surfaces of the mesh pipe framework (1) and the connecting piece (2), and the anticorrosion inner layer (4) is coated on the inner surfaces of the mesh pipe framework (1) and the connecting piece (2);

a plurality of slots (5) are axially arranged on the mesh pipe framework (1), the slots (5) are cuboid, and flanges (6) are arranged at the bottoms of the slots (5); the radial section of the connecting piece (2) is matched with the slot (5), a first groove (7) clamped with the flange (6) is formed in the bottom of the connecting piece (2), and the end part of the connecting piece (2) and the flange (6) are arranged in a fillet mode;

the slot (5) is an annular groove, at least four embedded grooves (8) are annularly distributed on the annular groove, a boss (9) is arranged in each embedded groove (8), and first screw holes (10) are arranged at the positions of the hole mesh pipe framework (1) radially corresponding to the bosses (9) and on the bosses (9); the connecting piece (2) is matched with the contour of the slot (5), a first screw hole (10) is also formed in the connecting piece (2) corresponding to the first screw hole (10), and a bolt (11) penetrates through the first screw hole (10) to fix the mesh pipe framework (1) and the connecting piece (2);

or the inserting grooves (5) are cylindrical grooves, the two ends of the connecting piece (2) are cylindrical, the first semicircular grooves (12) are formed in the cylindrical inserting parts of the two ends of the connecting piece (2) of the mesh pipe framework (1), the thickness of each first semicircular groove (12) is 0.5-1.0mm larger than the diameter of each through hole (101) of the mesh pipe framework (1), and the height of the bottom of each first semicircular groove (12) is 30-40% of the total thickness of the mesh composite pipe.

2. The self-sealing composite tube seal of claim 1, wherein: the lower part of the first semicircular groove (12) is provided with a trapezoidal groove (13), and the taper of 20-30 degrees is formed from the lower part of the trapezoidal groove (13) to the bottom of the mesh composite pipe.

3. The self-sealing composite tube seal of claim 1, wherein: the slot (5) is a cylindrical slot, a cylindrical table (23) is axially arranged on the slot, external threads are arranged on the surface of the cylindrical table (23), the connecting piece (2) is cylindrical, second grooves (17) capable of containing the cylindrical table (23) are formed in the two end portions of the connecting piece, internal threads are arranged on the surface of each second groove (17), and therefore the connecting piece (2) can be pressed into the slot (5) and fastened through threaded connection.

4. The self-sealing composite tube seal of claim 3, wherein: the connecting piece (2) is further sleeved with a gasket and a nut (18), and after the connecting piece (2) is pressed into the slot (5), the connecting piece (2) and the mesh pipe framework (1) are fastened by the gasket and the nut (18).

5. The self-sealing composite tube seal of claim 4, wherein: the gasket comprises a first gasket (19) and a second gasket (20), a sawtooth groove (21) is formed in the first gasket (19), sawteeth (22) are formed in the second gasket (20), and when the first gasket (19) and the second gasket (20) are connected, the sawteeth (22) are embedded into the sawtooth groove (21) to be meshed with each other to form staggered sawtooth-shaped contact surfaces.

6. The self-sealing composite tube seal of any of claims 1 to 5, wherein: the connecting piece (2) is provided with a through hole (16), and the anticorrosive outer layer (3) and the anticorrosive inner layer (4) are phenolic resin, epoxy resin, furan resin, polyester resin, polyurethane resin, ethylene resin, perchloroethylene resin, fluorine-containing resin or polyisobutylene rubber.

7. A pipe fitting, characterized by: comprising the self-sealing composite tube seal of any of claims 1-6.