Multi-layer composite reinforced ethylene propylene diene monomer chemical pipe
By designing a multi-layered composite structure and employing specific materials and layering techniques, the corrosion resistance, waterproofing, and pressure resistance issues of chemical pipelines have been resolved, enabling high performance and long service life for chemical pipelines.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHENGZHOU TENGLONG WATER HEATING FITTINGS FACTORY
- Filing Date
- 2025-06-17
- Publication Date
- 2026-04-21
AI Technical Summary
Traditional chemical pipelines are prone to damage and pose safety hazards when exposed to corrosive media due to insufficient corrosion resistance, poor waterproofing, limited pressure resistance, and poor wear resistance.
It adopts a multi-layer composite structure, including an inner waterproof and corrosion-resistant layer, a middle reinforcing layer, and an outer wear-resistant and transition layer. Each layer is made of specific rubber and fiber fabrics, forming a tight three-dimensional mesh structure and cross-woven design to improve corrosion resistance, waterproofness, strength and compressive strength.
It significantly improves the corrosion resistance, water resistance, pressure resistance and wear resistance of chemical pipelines, extends their service life, reduces the risk of leakage, and ensures the safety and stability of chemical production.
Smart Images
Figure CN224150337U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of rubber chemical pipes, specifically to multi-layer composite reinforced EPDM rubber chemical pipes. Background Technology
[0002] In the chemical industry, chemical pipelines need to transport various chemical media with different properties, such as corrosive liquids and gases. This places high demands on the performance of the pipelines, and pipelines made of a single material often cannot meet the complex operating conditions.
[0003] Traditional chemical pipelines may suffer from insufficient corrosion resistance, poor waterproofing, limited pressure resistance, and poor wear resistance. For example, while ordinary rubber pipes possess a certain degree of flexibility, they are easily corroded when exposed to corrosive chemical media for extended periods, leading to pipeline damage and leaks. This not only wastes chemical raw materials but may also cause safety accidents and environmental pollution. Furthermore, pipelines are subject to external environmental factors during use, such as temperature changes and mechanical forces. Therefore, we have proposed a multi-layer composite reinforced EPDM rubber chemical pipe. Utility Model Content
[0004] To address the shortcomings of existing technologies, this utility model provides a multi-layer composite reinforced EPDM rubber chemical pipe, which solves the aforementioned problems.
[0005] To achieve the above-mentioned objectives, this utility model provides the following technical solution: a multi-layer composite reinforced EPDM rubber chemical pipe, comprising an outer layer, a middle layer, and an inner layer, wherein the inner layer is disposed inside the middle layer, the middle layer is disposed inside the outer layer, and the inner layer includes a waterproof layer and a corrosion-resistant layer, wherein the waterproof layer is disposed inside the corrosion-resistant layer.
[0006] Preferably, the corrosion-resistant layer is made of EPDM rubber.
[0007] Preferably, the waterproof layer is made of any one of butyl rubber, neoprene rubber, or silicone rubber.
[0008] Preferably, the intermediate layer includes a reinforcing layer and an intermediate layer, wherein the reinforcing layer is disposed on the outside of the intermediate layer.
[0009] Preferably, the reinforcing layer is a multi-layered fiber fabric or a steel wire braided layer.
[0010] Preferably, the multilayer fiber fabric is made of polyester fiber or nylon fiber.
[0011] Preferably, the reinforcing layer is spirally wound on the outside of the intermediate layer or cross-woven on the outside of the intermediate layer.
[0012] Preferably, the middle layer has multiple sets of internal annular cavities equidistantly spaced inside, and the side wall of the internal annular cavity opposite to the center point and the side wall near the center point are both conical.
[0013] Preferably, the outer layer includes wear-resistant rubber and a transition layer, wherein the transition layer is disposed inside the wear-resistant rubber. The wear-resistant rubber is any one of natural rubber, nitrile rubber, or polyurethane rubber, and the transition layer is any one of styrene-butadiene rubber, chloroprene rubber, or thermoplastic elastomer.
[0014] Compared with the prior art, this utility model provides a multi-layer composite reinforced EPDM rubber chemical pipe, which has the following beneficial effects:
[0015] Excellent corrosion resistance: The corrosion-resistant layer is made of highly vulcanized EPDM rubber with a high molecular chain cross-linking density, forming a tight three-dimensional network structure. This reduces the diffusion and penetration rate of corrosive media, and the smooth surface reduces media adhesion and retention, effectively improving the corrosion resistance of pipelines, extending pipeline service life, reducing the risk of leakage caused by corrosion, and ensuring the safety and stability of chemical production.
[0016] Excellent waterproof performance: The waterproof layer can be made of butyl rubber, neoprene rubber, or silicone rubber. Butyl rubber has excellent airtightness and watertightness, preventing water penetration, and also has good chemical stability and weather resistance; neoprene rubber has good water resistance, low water absorption, and good mechanical strength and abrasion resistance, making it suitable as an outer protective material for the waterproof layer; silicone rubber has outstanding high and low temperature resistance, maintaining elasticity and waterproof performance in extremely cold and high temperature environments, and has low surface energy, making it difficult for water droplets to form and penetrate. These materials effectively prevent water from entering the pipe interior, avoiding various problems caused by water intrusion, such as increased corrosion and deterioration of material properties.
[0017] High strength and pressure resistance: The reinforcing layer uses multi-layered fiber fabrics such as polyester fiber, nylon fiber, or steel wire braided layers, arranged in a spiral or cross-woven manner on the outside of the intermediate layer. Multiple sets of internal annular cavities are equidistantly arranged inside the intermediate layer. When subjected to pressure, the reinforcing layer increases the pipe's strength, while the internal annular cavities provide deformation space for the intermediate layer. Together, these factors effectively improve the pipe's pressure resistance, enabling it to withstand greater pressure and reducing the likelihood of deformation and rupture. This makes it suitable for transporting chemical media under various pressure environments.
[0018] Good wear resistance: The outer wear-resistant rubber can be made of natural rubber, nitrile rubber or polyurethane rubber. These materials have good wear resistance and can resist friction and collision with external objects during use, protect the internal structure of the pipeline from damage and improve the overall durability of the pipeline.
[0019] Stable structural performance: The transition layer is made of styrene-butadiene rubber, neoprene rubber or thermoplastic elastomer. Its function is to improve the bonding performance between different material layers, buffer and coordinate the differences in properties, hardness, thermal expansion coefficients of each layer, reduce internal stress, prevent interlayer peeling and cracking, so that each layer of the pipeline forms an integral composite structure, improve the stability and reliability of the pipeline structure, and ensure that the pipeline maintains good performance during long-term use. Attached Figure Description
[0020] Figure 1 This is a schematic diagram of the structure of this utility model;
[0021] Figure 2 This is a side view of the present invention;
[0022] Figure 3 for Figure 2 AA section view diagram;
[0023] Figure 4 for Figure 3 A magnified view of section B in the diagram;
[0024] Figure 5 This is a schematic diagram of the reinforcement layer.
[0025] In the diagram: 1. Abrasion-resistant rubber; 2. Transition layer; 3. Reinforcing layer; 4. Intermediate layer; 5. Internal annular cavity; 6. Waterproof layer; 7. Corrosion-resistant layer. Detailed Implementation
[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0027] Please see Figure 1-5 The multi-layer composite reinforced EPDM rubber chemical pipe includes an outer layer, a middle layer and an inner layer. The inner layer is located inside the middle layer, and the middle layer is located inside the outer layer. The inner layer includes a waterproof layer 6 and a corrosion-resistant layer 7. The waterproof layer 6 is located inside the corrosion-resistant layer 7.
[0028] Furthermore, the corrosion-resistant layer 7 is made of EPDM rubber, which is the inner layer of the pipeline and comes into direct contact with the chemical medium. To improve corrosion resistance, this layer of rubber has a high degree of vulcanization and a high density of molecular chain crosslinking, forming a tight three-dimensional network structure. This reduces the gaps between molecular chains and lowers the diffusion and penetration rate of corrosive media. At the same time, the surface of the corrosion-resistant layer is usually relatively smooth to reduce the adhesion and retention of media on the inner wall of the pipeline, preventing localized corrosion.
[0029] Furthermore, waterproof layer 6 is made of butyl rubber, neoprene rubber, or silicone rubber. Butyl rubber has excellent airtightness and watertightness, and its air permeability is much lower than that of ordinary rubber, effectively preventing water penetration. It also has good chemical stability and weather resistance, maintaining good waterproof performance under various environmental conditions. Butyl rubber is often used as a waterproof coating or blended with EPDM rubber to improve the waterproof effect of chemical pipes. Neoprene rubber has good water resistance, oil resistance, and chemical corrosion resistance. It has low water absorption and maintains stable performance in humid environments. Neoprene rubber also has good mechanical strength and abrasion resistance, and can be used as an outer protective material for the waterproof layer to enhance its durability. Silicone rubber has outstanding high and low temperature resistance, maintaining good elasticity and waterproof performance in extremely cold and high temperature environments. Silicone rubber has low surface energy, resulting in a large contact angle for water on its surface, making it difficult for water droplets to form and penetrate, thus providing good waterproof effect. In addition, it also has excellent weather resistance and electrical insulation, making it suitable for waterproofing chemical pipes in some special environments.
[0030] Furthermore, the intermediate layer includes a reinforcing layer 3 and an intermediate layer 4, with the reinforcing layer 3 disposed on the outside of the intermediate layer 4.
[0031] Furthermore, the reinforcing layer 3 is made of multi-layer fiber fabric or steel wire braid.
[0032] Furthermore, the multi-layered fiber fabric is made of polyester or nylon fibers.
[0033] Furthermore, the reinforcing layer 3 is spirally wound around the outside of the intermediate layer 4 or cross-woven on the outside of the intermediate layer 4.
[0034] Furthermore, multiple sets of internal annular cavities 5 are equidistantly formed inside the intermediate layer 4. The side wall of the internal annular cavity 5 facing away from the center point and the side wall near the center point are both conical. When subjected to pressure, the reinforcement layer 3 can increase the strength, while the internal annular cavity 5 provides the intermediate layer 4 with deformation space, effectively increasing the compressive strength.
[0035] Furthermore, the outer layer includes wear-resistant rubber 1 and a transition layer 2. The transition layer 2 is disposed inside the wear-resistant rubber 1. The wear-resistant rubber 1 is made of any one of natural rubber, nitrile rubber, or polyurethane rubber. The transition layer 2 is made of any one of styrene-butadiene rubber, chloroprene rubber, or thermoplastic elastomer. Its function is to improve the bonding performance between different material layers, buffer and coordinate the differences in properties, hardness, and coefficient of thermal expansion of each layer of material, reduce internal stress, prevent interlayer peeling and cracking, and make the pipe layers form an integral composite structure.
[0036] Structural Description:
[0037] Wear-resistant rubber 1: As the outermost layer of the chemical pipe, it is mainly used to resist various types of wear encountered during use, including erosion wear during media transport and friction wear when the pipe comes into contact with external objects, thereby protecting the internal structure of the pipe and extending its service life. Wear-resistant rubber 1 can be made of any one of natural rubber, nitrile rubber, or polyurethane rubber. Natural rubber has good elasticity and wear resistance, and its cost is relatively low; nitrile rubber has excellent oil resistance and wear resistance, making it suitable for pipes transporting oily chemical media; polyurethane rubber has extremely high wear resistance and strength, making it suitable for chemical pipes with extremely high wear resistance requirements.
[0038] Transition layer 2: Located inside the wear-resistant rubber 1, it is made of styrene-butadiene rubber, neoprene rubber, or thermoplastic elastomer. Its function is to improve the bonding performance between different material layers, buffer and coordinate differences in properties, hardness, and coefficient of thermal expansion among the layers, reduce internal stress, prevent interlayer peeling and cracking, and form a unified composite structure for the pipe layers. Transition layer 2 is generally a thin and uniform material layer with hardness and elasticity between that of wear-resistant rubber 1 and the adjacent intermediate layer 4, serving as a gradual transition. Its molecular structure has a certain degree of flexibility and adjustability, enabling it to adapt to differences in performance between adjacent material layers.
[0039] Reinforcing layer 3: Located on the outside of the intermediate layer 4, it is made of multi-layered fiber fabric or steel wire braid. The multi-layered fiber fabric can be polyester fiber or nylon fiber. Reinforcing layer 3 is spirally wound on the outside of the intermediate layer 4 or cross-woven on the outside of the intermediate layer 4. Its main function is to provide high-strength support for the pipeline, increase the pipeline's pressure resistance and tensile strength, enabling it to withstand greater internal pressure and external tension, withstand the pressure of the medium inside the pipeline and external mechanical forces, and enhance the overall structural stability of the pipeline.
[0040] Intermediate layer 4: Located inside the reinforcing layer 3, it has multiple sets of internal annular cavities 5 evenly spaced within it. The side wall of each internal annular cavity 5 facing away from the center point and the side wall near the center point are both conical. Under pressure, the reinforcing layer 3 increases its strength, while the internal annular cavities 5 provide deformation space for the intermediate layer 4, effectively increasing its pressure resistance. The intermediate layer 4 acts as a buffer and coordinator, serving as a transition between the reinforcing layer 3 and the inner layer, allowing the pipeline to better distribute stress under pressure.
[0041] Internal annular cavity 5: Located inside the intermediate layer 4, it is evenly distributed, with both the side wall away from the center point and the side wall near the center point being conical. The presence of the internal annular cavity 5 allows the intermediate layer 4 to deform under pressure, absorbing and dispersing pressure through deformation. This, in conjunction with the reinforcing layer 3, effectively increases the pressure resistance of the pipeline, improving its stability and reliability.
[0042] Waterproof layer 6: Located inside the corrosion-resistant layer 7, it is made of butyl rubber, neoprene rubber, or silicone rubber. Butyl rubber has excellent airtightness and watertightness, with much lower air permeability than ordinary rubber, effectively preventing moisture penetration, and also has good chemical stability and weather resistance. Neoprene rubber has good water resistance, oil resistance, and chemical corrosion resistance, with low water absorption, maintaining stable performance in humid environments, and possessing good mechanical strength and abrasion resistance. Silicone rubber has outstanding high and low temperature resistance, maintaining good elasticity and waterproof performance in extremely cold and high temperature environments, with low surface energy, resulting in a large contact angle for water and making it difficult for water droplets to form and penetrate. The main function of waterproof layer 6 is to prevent external moisture from entering the pipe, avoiding problems such as aging and corrosion of the internal pipe materials due to moisture intrusion, and improving the waterproof performance and service life of the pipe.
[0043] Corrosion-resistant layer 7: Made of ethylene propylene diene monomer (EPDM) rubber, this inner layer of the pipeline comes into direct contact with the chemical medium. To improve corrosion resistance, this rubber layer has a high degree of vulcanization and a high density of molecular chain cross-linking, forming a tight three-dimensional network structure. This reduces the gaps between molecular chains and slows down the diffusion and penetration rate of corrosive media. Simultaneously, the surface of corrosion-resistant layer 7 is typically smooth to reduce the adhesion and retention of media on the inner wall of the pipeline, preventing localized corrosion. It primarily resists the erosion of chemical media, protects the internal structure of the pipeline from damage, and ensures the pipeline's sealing and safety.
[0044] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. Multilayer composite reinforced EPDM chemical pipe, characterized in that, It includes an outer layer, a middle layer and an inner layer. The inner layer is disposed inside the middle layer and the middle layer is disposed inside the outer layer. The inner layer includes a waterproof layer (6) and a corrosion-resistant layer (7). The waterproof layer (6) is disposed inside the corrosion-resistant layer (7).
2. The multi-layer composite reinforced EPDM chemical pipe according to claim 1, characterized in that: The corrosion-resistant layer (7) is made of EPDM rubber.
3. The multi-layer composite reinforced EPDM chemical pipe of claim 1, wherein: The waterproof layer (6) is made of any one of butyl rubber, neoprene rubber or silicone rubber.
4. The multi-layer composite reinforced EPDM chemical pipe of claim 1, wherein: The intermediate layer includes a reinforcing layer (3) and an intermediate layer (4), wherein the reinforcing layer (3) is disposed on the outside of the intermediate layer (4).
5. The multi-layer composite reinforced EPDM chemical pipe according to claim 4, characterized in that: The reinforcing layer (3) is made of multi-layer fiber fabric or steel wire braid.
6. The multi-layer composite reinforced EPDM chemical pipe according to claim 5, characterized in that: Multi-layer fiber fabrics are made of polyester or nylon fibers.
7. The multi-layer composite reinforced EPDM chemical pipe of claim 4, wherein: The reinforcing layer (3) is spirally wound on the outside of the intermediate layer (4) or cross-woven on the outside of the intermediate layer (4).
8. The multi-layer composite reinforced EPDM chemical pipe of claim 4, wherein: Multiple sets of internal annular cavities (5) are equidistantly opened inside the intermediate layer (4). The side wall of the internal annular cavity (5) away from the center point and the side wall near the center point are both conical.
9. The multi-layer composite reinforced EPDM chemical pipe of claim 1, wherein: The outer layer includes wear-resistant rubber (1) and a transition layer (2). The transition layer (2) is disposed on the inner side of the wear-resistant rubber (1). The wear-resistant rubber (1) is made of any one of natural rubber, nitrile rubber or polyurethane rubber. The transition layer (2) is made of any one of styrene-butadiene rubber, chloroprene rubber or thermoplastic elastomer.