Fire resistant plastic pipe
Through a multi-layer composite structure and high-temperature resistant sealing design, the problems of flammability and mechanical property degradation of plastic pipes are solved, achieving full-process fire protection and high-strength pipe performance, ensuring sealing performance and structural stability in high-temperature environments.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANDONG BOSAIL PIPE IND CO LTD
- Filing Date
- 2025-07-07
- Publication Date
- 2026-07-10
Smart Images
Figure CN224479378U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of plastic pipe technology, and in particular to a fireproof and flame-retardant plastic pipe. Background Technology
[0002] Pipelines are the most important medium for transporting liquids or gases. They are used in a wide range of industries, mainly for water supply, drainage, heating, gas supply, and long-distance oil transportation. They are also used extensively in natural gas, agricultural irrigation, hydraulic engineering, and various industrial installations. The importance of pipelines is self-evident. Most pipes are made of plastic.
[0003] Traditional plastic pipes lack strong sealing properties, often leading to leaks or seepage at pipe connections when transporting gases or liquids. The leaked gases or liquids can pollute the air and water, damaging the environment. Furthermore, the leaked gases or liquids may be toxic, posing significant safety hazards. Traditional plastic pipes also lack internal oleophobic materials, causing oil to adhere to the inner walls when transporting petroleum or other oily substances, resulting in incomplete transport. Prolonged immersion in oil can also lead to oil seepage, wasting resources and polluting the environment.
[0004] An existing patent (publication number: CN212691087U) discloses a plastic pipe with high-strength sealing effect. In this utility model, by installing a first sealing element and a second sealing element on the pipe, when it is necessary to seal the pipe in combination, the second sealing element is pressed down to press the positioning pin into the positioning hole opened on the surface of the first sealing element, and the second spring is pressed into the groove opened on the upper surface of the first sealing element, so that the positioning shaft is inserted into the positioning hole opened on the surface of the first fixing post. This provides a fast and efficient high-strength seal for the connected pipes, which can effectively prevent leakage at the pipe connection.
[0005] To address the aforementioned issues, existing patents offer solutions. While these solutions can seal the joints of pipes, most common plastic pipes on the market are made of polymers such as polyethylene and polypropylene. These materials have low oxygen indexes, making them flammable and generating a large amount of heat and toxic fumes when burning. Although some plastic pipes with added flame retardants have improved their flame retardancy to some extent, they often have performance shortcomings. Adding large amounts of inorganic flame retardants can significantly reduce the mechanical properties of the pipes, making them brittle and prone to cracking and deformation during transportation and installation.
[0006] Therefore, a fire-resistant and flame-retardant plastic pipe is proposed. Utility Model Content
[0007] The purpose of this utility model is to provide a fire-resistant and flame-retardant plastic pipe that can solve the problem that most ordinary plastic pipes on the market are made of polymer materials such as polyethylene and polypropylene. These materials have a low oxygen index, are flammable, and produce a lot of heat and toxic fumes when burning. Although some plastic pipes with added flame retardants have improved flame retardancy to a certain extent, they often have performance shortcomings. Adding a large amount of inorganic flame retardants will significantly reduce the mechanical properties of the pipe, making it brittle and hard, and prone to cracking and deformation during transportation and installation.
[0008] To achieve the above objectives, this utility model provides the following technical solution: a fireproof and flame-retardant plastic pipe, comprising a composite pipe body, wherein the composite pipe body comprises an inner layer, a first flame-retardant layer, a reinforcing layer, a second flame-retardant layer and an outer layer arranged sequentially from the inside to the outside, wherein the first flame-retardant layer is a bromine-based flame retardant modified polypropylene layer, the reinforcing layer is a glass fiber reinforced nylon layer, and the second flame-retardant layer is a phosphorus-based flame retardant modified ABS layer.
[0009] Preferably, the inner layer is an antistatic polyethylene layer.
[0010] Preferably, the outer layer is a ceramicized silicone rubber layer.
[0011] Preferably, the inner antistatic polyethylene layer contains carbon nanotube antistatic agents.
[0012] Preferably, the inner layer, the first flame-retardant layer, the reinforcing layer, the second flame-retardant layer, and the outer layer are tightly bonded together by a hot-melt composite process.
[0013] Preferably, both ends of the composite pipe body are provided with connecting flanges, and the connecting flanges are provided with sealing grooves, and high-temperature resistant sealing rings are installed in the sealing grooves.
[0014] Preferably, the outer surface of the composite pipe body is provided with a plurality of annularly raised reinforcing ribs.
[0015] Compared with the prior art, the beneficial effects of this utility model are:
[0016] 1. In this application, the bromine-based flame retardant in the first flame retardant layer and the phosphorus-based flame retardant in the second flame retardant layer work together through different flame retardant mechanisms to form a double flame retardant defense line, from inhibiting free radical reactions to promoting char formation; the outer ceramicized silicone rubber is transformed into a ceramic body at high temperature, further blocking flames and heat, and realizing full-process fire protection from the initial combustion stage to the high-temperature stage.
[0017] 2. This application uses glass fiber reinforced nylon in the reinforcing layer to give the pipe high strength and rigidity, which makes up for the problem of decreased mechanical properties caused by the addition of flame retardants. Together with the inner and outer layers, it forms a solid structural frame, ensuring that the pipe is not easily broken or deformed during transportation, installation and use. Attached Figure Description
[0018] Figure 1 This is an overall structural diagram of the fireproof and flame-retardant plastic pipe of this utility model;
[0019] Figure 2 This is an exploded view of the main body of the composite pipe of this utility model;
[0020] Figure 3 This is a schematic diagram showing the connection between the composite pipe body and the connecting flange of this utility model.
[0021] In the diagram, 1. Composite pipe body; 11. Inner layer; 12. First flame-retardant layer; 13. Reinforcing layer; 14. Second flame-retardant layer; 15. Outer layer; 2. Connecting flange; 3. Sealing groove; 4. High-temperature resistant sealing ring; 5. Reinforcing rib. Detailed Implementation
[0022] 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.
[0023] Please see Figure 1-3 The present invention provides the following technical solution:
[0024] A fire-retardant plastic pipe includes a composite pipe body 1. The composite pipe body 1 includes an inner layer 11, a first flame-retardant layer 12, a reinforcing layer 13, a second flame-retardant layer 14, and an outer layer 15 arranged sequentially from the inside to the outside. The first flame-retardant layer 12 is a polypropylene layer modified with a bromine-based flame retardant, the reinforcing layer 13 is a glass fiber reinforced nylon layer, and the second flame-retardant layer 14 is an ABS layer modified with a phosphorus-based flame retardant.
[0025] In this embodiment, the bromine-based flame retardant of the first flame retardant layer 12 and the phosphorus-based flame retardant of the second flame retardant layer 14 work together through different flame retardant mechanisms to form a dual flame retardant defense line, from inhibiting free radical reactions to promoting char formation. The ceramicized silicone rubber of the outer layer 15 is transformed into a ceramic body at high temperature, further blocking flames and heat, and achieving full-process fire protection from the initial combustion stage to the high-temperature stage. The glass fiber reinforced nylon of the reinforcing layer 13 gives the pipe high strength and rigidity, making up for the problem of decreased mechanical properties caused by the addition of flame retardants. Together with the inner layer 11 and the outer layer 15, it forms a solid structural frame, ensuring that the pipe is not easily broken or deformed during transportation, installation and use.
[0026] Specifically, such as Figure 2 As shown, the inner layer 11 is an antistatic polyethylene layer.
[0027] Specifically, such as Figure 2 As shown, the outer layer 15 is a ceramicized silicone rubber layer.
[0028] Specifically, such as Figure 2 As shown, carbon nanotube antistatic agents are added to the antistatic polyethylene layer of the inner layer 11.
[0029] In this embodiment: the inner layer 11, composed of an antistatic polyethylene layer, effectively conducts static electricity generated inside the pipe due to fluid transport, preventing static electricity accumulation from causing sparks. This is especially suitable for scenarios involving the transport of flammable and explosive fluids, reducing the risk of fire at the source. Furthermore, carbon nanotubes dispersed within the polyethylene matrix form a continuous conductive network, significantly reducing the surface resistance of the inner layer 11 and achieving efficient static electricity discharge. Compared to ordinary antistatic materials, its antistatic performance is more stable and durable. The outer layer 15 is made of ceramicized silicone rubber. At room temperature, the ceramicized silicone rubber layer possesses the elasticity and flexibility of rubber, facilitating pipe installation. In the event of a high-temperature fire, it rapidly transforms into a hard ceramic body, effectively blocking the transfer of flames and heat to the inside of the pipe, preventing the fire from spreading to the interior of the pipe.
[0030] Specifically, such as Figure 2 As shown, the inner layer 11, the first flame-retardant layer 12, the reinforcing layer 13, the second flame-retardant layer 14, and the outer layer 15 are tightly bonded together by a hot-melt composite process.
[0031] In this embodiment, the inner layer 11, the first flame-retardant layer 12, the reinforcing layer 13, the second flame-retardant layer 14, and the outer layer 15 are tightly bonded together by a hot-melt composite process. The hot-melt composite process allows the materials of each layer to penetrate and fuse with each other under high temperature and high pressure, forming a strong interface bond, avoiding interlayer separation or delamination, and ensuring that the multi-layer structure maintains its integrity under stress or fire conditions. The tight bonding method ensures that the functions of each layer can work together effectively, and the flame-retardant, anti-static, and reinforcing properties can be stably performed, improving the overall reliability of the pipe.
[0032] Specifically, such as Figure 1 , Figure 3 As shown, both ends of the composite pipe body 1 are provided with connecting flanges 2, and the connecting flanges 2 are provided with sealing grooves 3, and high-temperature resistant sealing rings 4 are installed in the sealing grooves 3.
[0033] Specifically, such as Figure 1 As shown, the outer surface of the composite pipe body 1 is provided with several annularly raised reinforcing ribs 5.
[0034] In this embodiment: the high-temperature resistant sealing ring 4 is compressed and deformed within the sealing groove 3, tightly filling the gap at the flange connection to prevent gas or liquid leakage, thus avoiding environmental pollution, resource waste, or safety hazards caused by leakage. The high-temperature resistance of the connecting flange 2 and the sealing ring ensures that the connection maintains good sealing performance even during high-temperature fires or when transporting high-temperature fluids, maintaining the integrity of the pipe system. The annular protrusion structure of the reinforcing rib 5 significantly enhances the circumferential compressive strength of the pipe, making it less prone to deformation or collapse when buried or subjected to external pressure, ensuring smooth fluid transport within the pipe.
[0035] Working principle: When the composite pipe body 1 is used, the bromine-based flame retardant in the first flame retardant layer 12 and the phosphorus-based flame retardant in the second flame retardant layer 14 work together through different flame retardant mechanisms to inhibit free radical reactions and promote char formation, forming a double flame retardant defense. The ceramicized silicone rubber in the outer layer 15 transforms into a ceramic body at high temperatures, further blocking flames and heat, achieving full-process fire protection from the initial combustion stage to the high-temperature stage. The glass fiber reinforced nylon in the reinforcing layer 13 gives the pipe high strength and rigidity, compensating for the decrease in mechanical properties caused by the addition of flame retardants. Together with the inner layer 11 and the outer layer 15, it forms a robust structural frame, ensuring the pipe's performance during transportation, installation, and use. It is not easily broken or deformed during the process; when the composite pipe body 1 is connected, the high-temperature resistant sealing ring 4 is squeezed and deformed in the sealing groove 3, tightly filling the gap at the flange connection to prevent gas or liquid leakage and avoid environmental pollution, resource waste or safety hazards caused by leakage. The high-temperature resistant characteristics of the connecting flange 2 and the sealing ring ensure that the connection still maintains good sealing performance when there is a fire or high temperature or when transporting high-temperature fluids, maintaining the integrity of the pipe system. When the composite pipe body 1 is buried or subjected to external pressure, the annular protrusion structure of the reinforcing rib 5 significantly enhances the circumferential pressure resistance of the pipe, making it less prone to deformation or collapse, and ensuring the smooth flow of fluid inside the pipe.
[0036] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A fire-resistant and flame-retardant plastic pipe, comprising a composite pipe body (1), characterized in that: The composite pipe body (1) includes an inner layer (11), a first flame retardant layer (12), a reinforcing layer (13), a second flame retardant layer (14), and an outer layer (15) arranged sequentially from the inside to the outside. The first flame retardant layer (12) is a polypropylene layer modified with a bromine flame retardant, the reinforcing layer (13) is a glass fiber reinforced nylon layer, and the second flame retardant layer (14) is an ABS layer modified with a phosphorus flame retardant.
2. The fire-resistant and flame-retardant plastic pipe according to claim 1, characterized in that: The inner layer (11) is an antistatic polyethylene layer.
3. The fire-resistant and flame-retardant plastic pipe according to claim 1, characterized in that: The outer layer (15) is a ceramicized silicone rubber layer.
4. The fire-resistant and flame-retardant plastic pipe according to claim 1, characterized in that: The inner layer (11) contains an antistatic polyethylene layer with added carbon nanotube antistatic agent.
5. The fire-resistant and flame-retardant plastic pipe according to claim 1, characterized in that: The inner layer (11), the first flame-retardant layer (12), the reinforcing layer (13), the second flame-retardant layer (14), and the outer layer (15) are tightly bonded together by a hot-melt composite process.
6. The fire-resistant and flame-retardant plastic pipe according to claim 1, characterized in that: Both ends of the composite pipe body (1) are provided with connecting flanges (2), and the connecting flanges (2) are provided with sealing grooves (3), and high temperature resistant sealing rings (4) are installed in the sealing grooves (3).
7. The fire-resistant and flame-retardant plastic pipe according to claim 1, characterized in that, The outer surface of the composite pipe body (1) is provided with several annularly raised reinforcing ribs (5).