Permanent inner film for UV-CIPP water supply material

Abstract

The invention relates to the field of water pipeline repair, in particular to a permanent inner film for a UV-CIPP water supply material, the permanent inner film comprises a PET needle-punched cloth layer arranged on the innermost layer, a film blowing layer arranged on the outermost layer and a bonding layer arranged between the PET needle-punched cloth layer and the film blowing layer, on the basis of an original pipeline, a UV-CIPP in-situ photocuring material is adopted for repair, and the UV-CIPP water supply material is obtained. The permanent inner film is designed to serve as the inner wall of the pipeline and permanently become the inner wall material of the pipeline, the needle-punched cloth material has good binding force and peel strength, the PET cloth and the film blowing material are combined in a film spraying mode, and by reducing the gram weight of the film spraying mode, the service life of the pipeline is prolonged, and the service life of the pipeline is prolonged. The instability of the large-gram-weight lamination material is greatly improved, and meanwhile, the PA material is also added, so that the temperature resistance of the material is improved.

Description

Technical Field

[0001] This invention relates to the field of water pipe repair, specifically a permanent inner membrane for UV-CIPP water supply materials. Background Technology

[0002] UV-CIPP flexible hose material is an emerging technology in China for the repair of trenchless water supply pipelines. The material is composed of glass fiber, resin, outer adhesive, outer membrane, and permanent inner membrane. The glass fiber and resin layers serve as the mechanical support layer of the material, which resists internal and external pressure. The permanent inner membrane serves as the sealing layer of the material, which not only plays a sealing role, but also plays a role in pipe wall wear resistance and increasing flow rate.

[0003] Existing UV-CIPP repair technology used in water supply systems employs pure PE materials or pure membrane coating techniques. However, these methods suffer from poor temperature resistance and strength, hindering the design of higher exothermic peak values ​​during resin curing and the high-temperature environment created by the curing lamps during construction. In the trenchless repair field, UV-CIPP materials for water supply pipeline repair are emerging and gradually playing an increasingly important role. The biggest difference between water supply and drainage pipelines is that water supply pipelines withstand both external and internal water pressure, while drainage pipelines mostly experience only external pressure. Therefore, designing a permanent inner membrane material that differs from traditional membrane coating structures is crucial. Summary of the Invention

[0004] To address the aforementioned problems, this invention proposes a permanent inner membrane for UV-CIPP water supply materials.

[0005] A permanent inner membrane for UV-CIPP water supply material includes an innermost PET needle-punched fabric layer, an outermost blown film layer, and an adhesive layer between the PET needle-punched fabric layer and the blown film layer. The weight percentage of the PET needle-punched fabric layer is 18% to 40%. The blown film layer accounts for 10% to 35% of the total weight. The adhesive layer accounts for 30% to 60% of the total weight.

[0006] Furthermore, the PET needle-punched fabric layer is made of needle-punched fabric material.

[0007] Furthermore, the PET needle-punched fabric layer is manufactured through a lamination process.

[0008] Furthermore, the blown film layer adopts a PE / PA / PE structure with a proportion of 35%, 30%, and 35%.

[0009] Furthermore, the blown film layer is manufactured using a blown film process, in which PA and PE materials are composited by blown film.

[0010] Furthermore, the adhesive layer bonding formula is NF528 material.

[0011] The beneficial effects of this invention are as follows: Based on the original pipeline, this invention uses UV-CIPP in-situ light-curing material for repair, and designs this permanent inner membrane as the inner wall of the pipeline, which will permanently become the inner wall material of the pipeline. The needle-punched cloth material has good bonding strength and peel strength. The PET cloth and blown film material are combined by the coating process. By reducing the basis weight of the coating, the instability of the high basis weight coating material is greatly improved. At the same time, PA material is added to improve the temperature resistance of the material. Attached Figure Description

[0012] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0013] Figure 1 This is a schematic diagram of the permanent inner membrane layer ratio structure of the present invention; Figure 2 This is a schematic diagram of the blown film layer structure of the present invention.

[0014] Reference numerals: 1. PET needle-punched fabric layer; 2. Adhesive layer; 3. Blown film layer. Detailed Implementation

[0015] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below.

[0016] Example 1: like Figures 1 to 2 As shown, a permanent inner membrane for UV-CIPP water supply material includes an innermost PET needle-punched fabric layer 1, an outermost blown film layer 3, and an adhesive layer 2 disposed between the PET needle-punched fabric layer 1 and the blown film layer 3. The PET needle-punched fabric layer 1 accounts for 18% of the total weight, and its basis weight ranges from 80 to 140 g / m². The blown film layer 3 accounts for 35% of the total weight. The adhesive layer 2 accounts for 47% of the total weight.

[0017] The PET needle-punched fabric layer 1 is made of needle-punched fabric material, which has good bonding strength and peel strength, with a peel strength greater than 32 N / CM.

[0018] Based on the existing pipeline, UV-CIPP in-situ light-curing material is used for repair, and this permanent inner membrane is designed as the inner wall of the pipeline and will permanently become the inner wall material of the pipeline. The needle-punched cloth material has good bonding strength and peel strength.

[0019] The PET needle-punched fabric layer 1 is manufactured by a lamination process, which combines PET fabric and blown film material through lamination. By reducing the basis weight of the lamination, the instability of the heavy-weight lamination material is greatly improved, while PA material is added to improve the temperature resistance of the material.

[0020] The blown film layer 3 adopts a PE / PA / PE structure with a proportion of 35%, 30%, and 35%. Due to the addition of PA, the temperature resistance of the material is improved.

[0021] The blown film layer 3 is manufactured using a blown film process, in which PA and PE materials are composited by blown film.

[0022] The adhesive layer 2 is formulated with NF528 material, which firmly bonds the PET needle-punched fabric layer 1 and the blown film layer 3.

[0023] Comparison of the mechanical properties retention rate at high temperatures between the composite film material with added PA blown film layer 3 and the material without added PA:

[0024] The data above clearly shows that adding PA material through this process can greatly improve the high-temperature retention rate of the material's mechanical properties, thereby enhancing the material's overall performance.

[0025] The process flow of this invention is as follows: PE and PA particles are co-extruded into cylindrical films using a blown film equipment with 7 to 13 screws, with a thickness of 160-300 μm. The finished co-extruded cylindrical film is unfolded into sheet film using an unfolding device; The film is made by combining the PET needle-punched cloth layer 1 (18% by weight), the blown film layer 3 (35% by weight), and the adhesive layer 2 (47% by weight) through a coating equipment to create a permanent inner film.

[0026] Example 2: This second embodiment is an optimization based on the first embodiment, wherein the PET needle-punched fabric layer 1 accounts for 40% of the weight and the weight range is 80-140 g / m². The blown film layer 3 accounts for 10% of the total weight. The adhesive layer 2 accounts for 50% of the total weight.

[0027] The rest is the same as in Example 1. The film is bonded together by a coating equipment according to the following ratio: 40% by weight of PET needle-punched cloth layer 1, 10% by weight of blown film layer 3, and 50% by weight of adhesive layer 2, to make a permanent inner film of the finished product.

[0028] Example 3: This third embodiment is an optimization based on the first embodiment, wherein the PET needle-punched fabric layer 1 accounts for 27% of the weight and the weight range is 80-140 g / m². The blown film layer 3 accounts for 20% of the total weight. The adhesive layer 2 accounts for 53% of the total weight.

[0029] The rest is the same as in Example 1. The film is bonded together by coating the PET needle-punched cloth and blown film in a coating process according to the following proportions: PET needle-punched cloth layer 1 accounts for 27% of the weight, blown film layer 3 accounts for 23% of the weight, and adhesive layer 2 accounts for 53% of the weight, to make a permanent inner film of the finished product.

[0030] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely prisms of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A permanent inner membrane for UV-CIPP water supply materials, characterized in that: It includes the innermost PET needle-punched fabric layer (1), the outermost blown film layer (3), and the adhesive layer (2) between the PET needle-punched fabric layer (1) and the blown film layer (3); The weight percentage of the PET needle-punched fabric layer (1) is 18% to 40%; The blown film layer (3) accounts for 10% to 35% of the total weight. The adhesive layer (2) accounts for 30% to 60% of the total weight.

2. The permanent inner membrane for UV-CIPP water supply materials according to claim 1, characterized in that: The PET needle-punched fabric layer (1) is made of needle-punched fabric material.

3. The permanent inner membrane for UV-CIPP water supply materials according to claim 1, characterized in that: The PET needle-punched fabric layer (1) is manufactured by a lamination process.

4. The permanent inner membrane for UV-CIPP water supply materials according to claim 1, characterized in that: The blown film layer (3) adopts a PE / PA / PE structure with a proportion of 35%, 30%, and 35%.

5. A permanent inner membrane for UV-CIPP water supply materials according to claim 1, characterized in that: The blown film layer (3) is made by blown film process, in which PA and PE are composited by blown film process.

6. A permanent inner membrane for UV-CIPP water supply materials according to claim 1, characterized in that: The adhesive layer (2) is formulated with NF528 material.

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