Good water resistance, commonly used rubber suction and drainage pipes for temperature and pressure

1、 Technical analysis: Collaborative design of water resistance, temperature resistance, and pressure resistance

In the construction, municipal, and industrial fields, suction and discharge pipes need to be exposed to humid, high or low temperature environments for a long time, and withstand fluid pressure and mechanical stress. Universal rubber suction and drainage pipes achieve a balance between water resistance, temperature resistance, and pressure resistance through material formula optimization and structural innovation.

 

（1） Water resistant material technology

Rubber matrix modification

Ethylene propylene diene monomer (EPDM): The main chain has a saturated structure, high molecular chain stability, water absorption rate ≤ 0.5% (ASTM D570 standard), and tensile strength retention rate ≥ 90% after soaking in water for 1 year. For example, a certain EPDM suction and discharge pipe has been running continuously for 3 years in a seawater desalination project, and there is no hydrolysis phenomenon on the inner wall.

Chloroprene rubber (CR) composite: By adding nano zinc oxide (ZnO) and sulfur crosslinking system, the hydrolysis resistance is improved. In an acid-base environment with pH 2-12, the mass loss rate is ≤ 0.3%, which is twice as high as traditional CR rubber.

Anti infiltration and anti adsorption design

Inner lining coating technology: PTFE dispersion is used to coat the inner wall, forming a dense hydrophobic layer with a contact angle of ≥ 120 °. The rolling angle of water droplets on the inner wall of the pipe is ≤ 10 °, effectively reducing the adhesion of scale and microorganisms.

Fiber reinforced lining: Polyester fibers (warp and weft density ≥ 8 × 8 fibers/cm) are embedded in the rubber matrix to reduce the permeation rate of water molecules. Under a water head pressure of 50m, the leakage rate is ≤ 0.01L/(m ² · h).

（2） Temperature and pressure resistance performance

Expansion of temperature resistance range

Low temperature toughness: By adding plasticizers (such as dioctyl adipate) and cold resistant agents (such as dibutyl phthalate), the glass transition temperature (Tg) of rubber is reduced to below -45 ℃. For example, the suction and drainage pipes at a construction site in northern China can still maintain flexibility without brittle cracking even at low temperatures of -30 ℃.

High temperature stability: The peroxide vulcanization system is used to increase the cross-linking density of rubber. After continuous operation at 120 ℃ for 1000 hours, the hardness change is ≤ 5 Shore A, and the tensile strength retention rate is ≥ 85%.

Pressure resistant structural design

Multi layer composite structure: The pipe body is composed of an inner lining layer, a reinforcement layer, and an outer protective layer. The reinforcement layer is made of high-strength polyester cord fabric (with a breaking strength of ≥ 500N/mm), with a winding angle of 54.74 °, and can withstand a working pressure of 2.5MPa. For example, a municipal drainage pipe has been running continuously for 5 years without leakage under a pressure of 2.0 MPa.

Dynamic pressure tolerance: In pulse pressure testing (pressure fluctuation range ± 0.5MPa, frequency 0.5Hz), continuous operation for 500000 times without fatigue damage, and the service life is 4 times longer than that of single-layer structures.

（3） Aging resistance and environmental performance

Anti UV and ozone

Outer protective layer formula: Add carbon black (N550) and ultraviolet absorber (UV-531) to ensure that the rubber has no cracks after 500 hours of ozone aging test (50pphm, 40 ℃), and the UV resistance is improved by 50%.

Weather resistant coating: The surface of the outer protective layer is coated with acrylic copolymer, which has passed the 2000 hour xenon lamp aging test according to ISO 4892 standard. The color difference Δ E is ≤ 3, and the gloss retention rate is ≥ 80%.

Environmental Protection and Recyclability

Bio based rubber: By using bio based EPDM (bio based content ≥ 30%) as a partial replacement for petroleum based rubber, carbon emissions are reduced by 25%.

Recyclable design: The tube material can recover 90% of rubber raw materials through thermal cracking technology, which complies with the EU REACH regulation and RoHS directive.

2、 Application scenarios and typical cases

Universal rubber suction and discharge pipes are widely used in the fields of construction, municipal, mining, and agriculture to meet the fluid transmission needs of different working conditions.

 

（1） Construction industry: Drainage and underfloor heating systems for high-rise buildings

Application scenarios

The discharge of rainwater and sewage in high-rise buildings requires a water head pressure of 10-20m and noise reduction function.

The circulation water transmission of the underfloor heating system requires pipes to withstand temperatures of 80-95 ℃ and have no harmful substance precipitation.

classic case

A super high-rise office building adopts EPDM suction and drainage pipes with a diameter of 160mm, and the inner lining layer is added with nano silver ion antibacterial agents to inhibit the growth of Escherichia coli and Staphylococcus aureus, reducing the complaint rate of odor in the drainage system by 80%.

A green building underfloor heating project: The outer protective layer of the pipe is made of flame-retardant PA12 (oxygen index ≥ 32%), which has passed UL94 V-0 certification to avoid fire hazards. At the same time, the inner wall roughness is ≤ 0.01mm, and the water flow resistance is reduced by 15%.

（2） Municipal engineering: sewage and rainwater pipe network

Application scenarios

The urban sewage network needs to withstand the corrosion and wear of acidic and alkaline wastewater (pH 4-9) and solid particles (particle size ≤ 5mm).

The rainwater pipe network needs to be drained quickly to avoid waterlogging, and requires pipes with good flexibility to adapt to complex terrain.

classic case

A coastal city's sewage pipeline network uses CR/EPDM blended rubber pipes with ceramic particle reinforced PTFE coating as the inner lining. When transporting sewage containing 20% quartz sand, the wear rate is ≤ 0.02mm/1000 hours, and the service life is 5 times longer than PVC pipes.

Rainwater pipe network in a mountain area: the small bending radius of the pipe is 3 times of the outer diameter. The installation efficiency is increased by 40% through S-shaped laying across the gully, and the drainage volume during the rainstorm is up to 500L/s, without blockage.

（3） Mining and Agriculture: Tailings Transportation and Irrigation Systems

Application scenarios

The mine tailings dry discharge system needs to transport slurry with a mud content of 30% -50%, and the pipes are required to be wear-resistant and corrosion-resistant.

The agricultural irrigation system needs to adapt to temperature differences of -10 ℃ to 50 ℃ and have UV resistance.

classic case

A certain iron ore tailings project: using steel wire reinforced rubber pipes with a diameter of 250mm, the blasting pressure reaches 6.0MPa. When transporting tailings with a solid content of 45%, it runs continuously for 18 months without leakage, and the annual maintenance cost is reduced by 60%.

A large-scale farm irrigation project: Adding light stabilizers to the outer protective layer of the pipe, after 5 years of outdoor exposure, the tensile strength retention rate is ≥ 85%, and the inner wall is smooth. The head loss is reduced by 30% compared to steel pipes.

3、 Industry Trends and Product Upgrade Directions

（1） Technological development trends

Ultra high pressure and large caliber

The demand in industries such as mining and chemical engineering is driving the development of pipes with a pressure resistance level of over 8.0MPa, which requires the use of aramid fiber reinforcement technology. For example, the aramid rubber composite pipe developed by a certain laboratory has a working pressure of 10.0MPa and a weight reduction of 50% compared to steel pipes.

Large diameter pipes (diameter ≥ 1000mm) are used for urban drainage main pipes, and the forming process (such as winding method) and joint sealing technology need to be optimized.

Intelligence and Monitoring

Integrated fiber optic sensor for real-time monitoring of pressure, flow rate, and leakage inside the pipeline. For example, a certain smart pipe can locate leakage points with an accuracy of ± 1m and a response time of ≤ 5 seconds through distributed fiber optic sensing technology.

RFID chips achieve full lifecycle management, with traceability from production to disposal.

Environmental Protection and Sustainability

Biodegradable rubber (such as polyhydroxyalkanoates, PHA) and recyclable reinforcement materials can be disposed of and recycled through composting or pyrolysis.

Low VOC outer protective layer material, compliant with EU REACH regulations, reduces environmental pollution during construction.

（2） Changes in market demand

Driven by new energy and green buildings

The cooling water system of photovoltaic power plants and geothermal energy utilization projects require higher temperature resistance of pipes (such as -50 ℃ to 150 ℃).

Green building certifications such as LEED and BREEAM are driving the growth of demand for environmentally friendly pipes.

Globalization and Localization Services

Multinational engineering companies require suppliers to have global supply capabilities and localized services. For example, an international contractor requires suppliers to respond to overseas after-sales needs within 72 hours and provide on-site installation guidance.

（3） Product upgrade strategy

Differentiated product positioning

Small and medium-sized manufacturers focus on segmented markets, such as a company specializing in mining wear-resistant pipes, which occupies 30% of the mid to low end market share through the combination of "ceramic lining+aramid reinforcement".

Large manufacturers monopolize the high-end market through technology, such as a certain international brand's aramid composite pipe, which has a price 40% higher than similar products, but has extremely strong customer stickiness.

Service oriented transformation

Provide a one-stop solution of "pipe assembly+installation tools+training". For example, a manufacturer customized pipe installation fixtures for a sewage treatment plant, which increased assembly efficiency by 50%.

Carry out the "trade in" business, recycle old pipes and remanufacture them to achieve 85% performance of new products, reducing costs by 35%.

Globalization Layout and Compliance

Establish production bases in emerging markets such as Southeast Asia and Africa to avoid trade barriers. For example, a domestic manufacturer has established a factory in Indonesia, with products radiating to the ten ASEAN countries, resulting in a 20% reduction in tariff costs.

Through ISO 14001 environmental management system certification and ISO 45001 occupational health and safety management system certification, it meets international ESG requirements.

（4） Future innovation direction

Self repair and long-term protection

Develop a rubber matrix for microencapsulated repair agents. When microcracks appear on the inner wall of the pipe, the repair agent will automatically release and solidify, extending its service life. For example, a self-healing EPDM material developed by a certain laboratory has a crack repair rate of 85%.

Modularization and rapid replacement

Design detachable joints and modular pipe sections, which can be quickly replaced when a single pipe section is damaged, without the need to shut down and replace the entire section. For example, the replacement time for a modular piping system has been reduced from 4 hours for traditional welded joints to 30 minutes.

Energy recovery and energy-saving design

Integrating piezoelectric materials on the outer wall of the pipe to convert fluid pressure energy into electrical energy and supply power to the sensor. For example, a certain piezoelectric pipe can achieve an output power of up to 10W under a pressure of 2.0MPa, which meets the electricity needs of some monitoring equipment.

In the future, temperature and pressure resistant universal rubber suction and discharge pipes need to continuously iterate technology to adapt to the trend of green and intelligent construction industry. Manufacturers need to strengthen cooperation with end users, deeply participate in the design of fluid transmission systems, and build technological barriers and cost advantages through material innovation and process optimization, in order to take the initiative in global competition. For example, developing ultra wear-resistant lining (such as diamond-like carbon coating), lightweight reinforcement structure (such as hollow fiber weaving), etc., further enhancing product competitiveness.

 

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