Peelable oxygen-blocking PP-R fiber composite pipe

Abstract

The utility model relates to a peelable oxygen barrier type PP-R (polypropylene random copolymer) fiber composite pipe. The problems that in the prior art, a composite pipe is poor in oxygen blocking effect, and outer wall materials are inconvenient to remove during hot melting butt joint are solved. The composite material comprises a glass fiber layer structure, PPR inner and outer layer structures are arranged in the circumferential direction of the glass fiber layer structure, an oxygen barrier layer is connected to the circumferential outer side of the glass fiber layer structure through a glue layer structure, and an easy-to-tear structure layer is arranged in the circumferential direction of the oxygen barrier layer. The pipe fitting has the advantages of being good in oxygen blocking effect, capable of effectively avoiding growth of chippings and incrustation in the pipe fitting, more convenient to remove the oxygen blocking layer during hot melting butt joint, and good in using effect.

Description

Technical Field

[0001] This utility model relates to the field of pipe technology, specifically to a peelable oxygen barrier PP-R fiber composite pipe. Background Technology

[0002] PPR, or random copolymer polypropylene, has been widely used in China since its introduction, despite some shortcomings, due to its advantages such as energy saving, environmental friendliness, pressure resistance, corrosion resistance, ease of construction, and long service life. Furthermore, the introduction of glass fiber has solved the problems of low stiffness, easy bending, and high linear expansion coefficient of PPR. However, most existing PPR composite pipes are solid internally, making them prone to breakage under high folding strength. Meanwhile, in domestic or industrial water supply pipelines, prolonged use leads to scale buildup on the inner surface of the pipes. The high gas permeability of plastic pipes allows atmospheric oxygen to seep into the pipeline system through the pipe wall, easily inducing oxidation and corrosion of metal inserts and other components connected to the plastic pipe, resulting in rust. Oxygen penetration also promotes microbial growth, producing bacterial fouling. All of these factors negatively impact the quality of the transported water, affecting human health. Moreover, surface fouling reduces the flow area within the pipe with increasing usage time, even blocking the pipeline, affecting the system's water transport capacity, significantly increasing energy consumption, and providing poor oxygen barrier properties. Additionally, removing the outer wall material during heat fusion welding is inconvenient.

[0003] To address the shortcomings of existing technologies, people have conducted long-term explorations and proposed various solutions. For example, Chinese patent literature discloses a PPR composite pipe [CN202121256795.4], which includes an aluminum outer shell. An adsorption mechanism is fixedly installed inside the aluminum outer shell. Impurities generated in the water are separated from the plastic inner shell by an anti-adhesion film. When the activated carbon receiving tube adsorbs organic impurities, a small amount of smaller impurities enter the transition groove through the tiny gaps between the activated carbon receiving tubes and are collected. The impurities adsorbed between the isolation tube and the activated carbon receiving tube are dried and fall into the pipe after the water is treated by the activated carbon receiving tube. When water flows through again, they are flushed out of the pipe and cannot adhere to the inner wall of the pipe, thus reducing the occurrence of blockages. The purification of harmful substances by the activated carbon receiving tube increases the quality of the water source in the pipe. During transportation and installation, when the pipe body bends, the buffer holes inside the aluminum outer shell disperse the gravity to the gaps, increasing the folding angle of the pipe body and preventing the pipe body from breaking.

[0004] The above solution has solved the problem of composite pipes being prone to breakage in the existing technology to a certain extent, but the solution still has many shortcomings, such as poor oxygen barrier effect and inconvenience in removing the outer wall material during hot-melt welding. Summary of the Invention

[0005] The purpose of this invention is to address the above-mentioned problems by providing a peelable oxygen-barrier PP-R fiber composite pipe.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a peelable oxygen-barrier PP-R fiber composite pipe, comprising a glass fiber layer structure, wherein the glass fiber layer structure is provided with PPR inner and outer layer structures in the circumferential direction, and an oxygen barrier layer is connected to the outer side of the glass fiber layer structure in the circumferential direction through an adhesive layer structure, and an easy-tear structure layer is provided in the circumferential direction of the oxygen barrier layer.

[0007] In the above-mentioned peelable oxygen barrier PP-R fiber composite pipe, the inner wall of the oxygen barrier layer is provided with a connecting inner layer connected to the adhesive layer structure, and the outer wall of the oxygen barrier layer is provided with a sealing outer layer connected to the easy-tear structure layer.

[0008] In the above-mentioned peelable oxygen barrier PP-R fiber composite pipe, the easy-tear structural layer includes an easy-tear layer disposed on the circumferential outer wall of the sealing outer layer. The easy-tear layer is provided with a number of annular easy-tear lines arranged at equal intervals in the circumferential direction. The easy-tear layer is also provided with longitudinal easy-tear lines that penetrate through the annular easy-tear lines.

[0009] In the aforementioned peelable oxygen-barrier PP-R fiber composite pipe, the easy-tear layer, the sealing outer layer, and the oxygen-barrier layer are integrated into a single structure.

[0010] In the above-mentioned peelable oxygen barrier PP-R fiber composite pipe, the PPR inner and outer layer structure includes an outer PPR layer disposed on the outer side of the glass fiber layer structure and connected to the adhesive layer structure, and an inner PPR layer disposed on the inner side of the glass fiber layer structure.

[0011] In the above-mentioned peelable oxygen barrier PP-R fiber composite pipe, the adhesive layer structure includes an adhesive inner layer connected to the PPR outer layer, and a corrugated adhesive layer is provided between the adhesive inner layer and the connecting inner layer in the circumferential direction.

[0012] In the above-mentioned peelable oxygen barrier PP-R fiber composite pipe, the upper end face of the corrugated adhesive layer is provided with several upper adhesive injection chambers, and the lower end of the corrugated adhesive layer is provided with several lower adhesive injection chambers.

[0013] In the above-mentioned peelable oxygen-barrier PP-R fiber composite tube, the upper glue injection chamber and the lower glue injection chamber are separated from each other.

[0014] In the above-mentioned peelable oxygen barrier PP-R fiber composite pipe, the fiberglass layer structure includes a fiberglass layer body, and several annular insertion parts are respectively provided on both sides of the fiberglass layer body. The annular insertion parts are respectively embedded in the corresponding PPR outer layer and PPR inner layer.

[0015] In the aforementioned peelable oxygen-barrier PP-R fiber composite pipe, the oxygen barrier layer is made of a copolymer of polyvinyl alcohol and ethylene.

[0016] Compared with the prior art, the advantages of this utility model are: it can effectively improve the oxygen barrier effect of the composite pipe, prevent external air from entering and causing bacteria or scale to grow on the inner wall of the composite pipe, and the easy-tear structural layer can quickly remove the oxygen barrier layer during the hot-melt welding of the pipe fittings, thus improving the construction efficiency. Secondly, the specially designed adhesive layer structure makes the inner and outer layers of the composite pipe more stable and more resilient. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the easy-tear structural layer of this utility model;

[0019] Figure 3 This is a cross-sectional view of the adhesive layer structure in this utility model;

[0020] Figure 4 This is a schematic diagram of the inner and outer layers of PP in this utility model;

[0021] Figure 5 This is a schematic diagram of the oxygen barrier layer structure in this utility model;

[0022] In the diagram: 1. Fiberglass layer structure; 11. Fiberglass layer body; 12. Annular insertion part; 2. PP inner and outer layer structure; 21. PPR outer layer; 22. PPR inner layer; 3. Adhesive layer structure; 31. Adhesive bonding inner layer; 32. Corrugated adhesive layer; 33. Upper adhesive injection cavity; 34. Lower adhesive injection cavity; 4. Oxygen barrier layer; 41. Connecting inner layer; 42. Sealing outer layer; 5. Easy-tear structural layer; 51. Easy-tear layer; 52. Annular easy-tear line; 53. Longitudinal easy-tear line. Detailed Implementation

[0023] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0024] like Figure 1-5 As shown, a peelable oxygen-barrier PP-R fiber composite pipe includes a glass fiber layer structure 1, a PPR inner and outer layer structure 2 circumferentially provided on the glass fiber layer structure 1, an oxygen barrier layer 4 connected to the outer side of the glass fiber layer structure 1 through an adhesive layer structure 3, and an easy-tear structure layer 5 circumferentially provided on the oxygen barrier layer 4.

[0025] The oxygen barrier layer 4 has an inner connecting layer 41 on its inner circumference that is connected to the adhesive layer structure 3, and an outer sealing layer 42 on its outer circumference that is connected to the easy-tear structure layer 5.

[0026] By setting an inner connecting layer 41 and a sealing outer layer 42 on the inside and outside of the oxygen barrier layer 4 respectively, the oxygen barrier effect is improved on the one hand, and the connection stability is improved on the other hand, thus forming a protection for the oxygen barrier layer 4.

[0027] As can be seen, the easy-tear structural layer 5 includes an easy-tear layer 51 disposed on the outer wall of the sealing outer layer 42. The easy-tear layer 51 is provided with a plurality of annular easy-tear lines 52 arranged at equal intervals in the circumferential direction. The easy-tear layer 51 is also provided with longitudinal easy-tear lines 53 that penetrate through the annular easy-tear lines 52.

[0028] Furthermore, the easy-tear layer 51, the sealing outer layer 42, and the oxygen barrier layer 4 are integrated into a single structure.

[0029] By setting an annular easy-tear line 52 and a longitudinal easy-tear line 53 on the easy-tear layer 51, it is easier to tear manually and more convenient to determine the size of the oxygen barrier layer 4 to be removed.

[0030] When the easy-tear layer 51 is torn, the oxygen barrier layer 4 and the sealing outer layer 42 are torn simultaneously, and the connecting inner layer 41 is fixed.

[0031] Furthermore, the PPR inner and outer layer structure 2 includes an outer PPR layer 21 disposed on the outer side of the fiberglass layer structure 1 and connected to the adhesive layer structure 3, and an inner PPR layer 22 disposed on the inner side of the fiberglass layer structure 1.

[0032] The outer PPR layer 21 and the inner PPR layer 22 are made of ordinary PPR material. PP-R is a resin with a density of 0.9 to 0.92 g / cm3 and a melt index of 0.2 to 0.5 g / 10min.

[0033] Specifically, the adhesive layer structure 3 includes an adhesive inner layer 31 connected to the PPR outer layer 21, and a corrugated adhesive layer 32 is provided between the adhesive inner layer 31 and the connecting inner layer 41 in the circumferential direction.

[0034] More specifically, the upper end face of the corrugated adhesive layer 32 is provided with a plurality of upper adhesive injection cavities 33, and the lower end of the corrugated adhesive layer 32 is provided with a plurality of lower adhesive injection cavities 34.

[0035] Preferably, the upper glue injection cavity 33 and the lower glue injection cavity 34 are separated from each other.

[0036] This design avoids stress interference between the inner and outer layers, ensuring the stability of the composite pipe and improving its toughness.

[0037] In detail, the fiberglass layer structure 1 includes a fiberglass layer body 11, and a plurality of annular insertion portions 12 are provided on both sides of the fiberglass layer body 11 in the circumferential direction, and the annular insertion portions 12 are respectively embedded into the corresponding PPR outer layer 21 and PPR inner layer 22.

[0038] The glass fiber layer 11 is the middle layer of the pipe. The added glass fiber enhances the mechanical properties and improves the structural strength of the pipe.

[0039] In addition, the oxygen barrier layer 4 is made of a copolymer of polyvinyl alcohol and ethylene.

[0040] In summary, the principle of this embodiment is as follows: an oxygen barrier layer 4 is connected to the outer side of the fiberglass layer 11 via an adhesive layer structure 3, which improves the oxygen barrier effect of the pipe and prevents air from entering and causing bacteria and scale to grow on the inner wall. Secondly, an easy-tearable structural layer 5 that can be linked is set to the outer side of the oxygen barrier layer 4, which facilitates the quick tearing and removal of excess oxygen barrier layer 4 during hot-melt welding, improving construction efficiency. Furthermore, by adding a specially designed corrugated adhesive layer 32, the key inner and outer layers are indirectly connected, avoiding stress interference between the inner and outer parts of the pipe and improving structural toughness.

[0041] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

[0042] Although this document frequently uses terms such as fiberglass layer structure 1, fiberglass layer body 11, annular insertion part 12, PP inner and outer layer structure 2, PPR outer layer 21, PPR inner layer 22, adhesive layer structure 3, adhesive inner layer 31, corrugated adhesive layer 32, upper adhesive injection cavity 33, lower adhesive injection cavity 34, oxygen barrier layer 4, connecting inner layer 41, sealing outer layer 42, easy-tear structural layer 5, easy-tear layer 51, annular easy-tear line 52, and longitudinal easy-tear line 53, the possibility of using other terms is not excluded. The use of these terms is merely for the convenience of describing and explaining the essence of this utility model; interpreting them as any additional limitation would contradict the spirit of this utility model.

Claims

1. A strippable oxygen barrier type PP-R fibreglass composite pipe comprising a fibreglass layer structure (1), characterised in that, The glass fiber layer structure (1) is provided with a PPR inner and outer layer structure (2) in the circumferential direction, the outer side of the glass fiber layer structure (1) is connected with an oxygen barrier layer (4) through a glue layer structure (3), and the oxygen barrier layer (4) is provided with an easy-to-tear structure layer (5) in the circumferential direction.

2. The strippable oxygen barrier PP-R fiber composite pipe according to claim 1, characterized in that, The circumferential inner wall of the oxygen barrier layer (4) is provided with a connecting inner layer (41) connected with the glue layer structure (3), and the circumferential outer wall of the oxygen barrier layer (4) is provided with a sealing outer layer (42) connected with the easy-to-tear structure layer (5).

3. The strippable oxygen barrier PP-R fiber composite pipe according to claim 2, characterized in that, The easy-to-tear structure layer (5) comprises an easy-to-tear layer (51) arranged on the circumferential outer wall of the sealing outer layer (42), a plurality of annular easy-to-tear lines (52) arranged at equal intervals in the circumferential direction of the easy-to-tear layer (51), and a longitudinal easy-to-tear line (53) penetrating the annular easy-to-tear lines (52).

4. The strippable oxygen barrier PP-R fiber composite pipe according to claim 3, characterized in that, The easy-to-tear layer (51), the sealing outer layer (42) and the oxygen barrier layer (4) are integrated.

5. The strippable oxygen barrier PP-R fiber composite pipe according to claim 1, characterized in that, The PPR inner and outer layer structure (2) comprises a PPR outer layer (21) arranged on the outer side of the glass fiber layer structure (1) and connected with the glue layer structure (3), and the inner side of the glass fiber layer structure (1) is provided with a PPR inner layer (22).

6. The strippable oxygen barrier PP-R fiber composite pipe according to claim 5, characterized in that, The glue layer structure (3) comprises a glue connecting inner layer (31) connected with the PPR outer layer (21), and a wave-shaped glue layer (32) is arranged between the circumferential direction of the glue connecting inner layer (31) and the connecting inner layer (41).

7. The strippable oxygen barrier PP-R fiber composite pipe according to claim 6, characterized in that, The upper end surface of the wave-shaped glue layer (32) is provided with a plurality of upper glue injection cavities (33), and the lower end of the wave-shaped glue layer (32) is provided with a plurality of lower glue injection cavities (34).

8. The strippable oxygen barrier PP-R fiber composite pipe according to claim 7, characterized in that, The upper glue injection cavities (33) and the lower glue injection cavities (34) are separated from each other.

9. The strippable oxygen barrier PP-R fiber composite pipe according to claim 5, characterized in that, The glass fiber layer structure (1) comprises a glass fiber layer body (11), and the circumferential two sides of the glass fiber layer body (11) are respectively provided with a plurality of annular insertion parts (12), and the annular insertion parts (12) are respectively embedded into the corresponding PPR outer layer (21) and PPR inner layer (22).

10. The strippable oxygen barrier PP-R fiber composite pipe according to claim 1, characterized in that, The material of the oxygen barrier layer (4) is a copolymer of polyvinyl alcohol-ethylene.

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