Rotoun Patents | Wear‑Resistant & High‑Temp Resistant Material for Plastic‑Lined Pipes ZL202211715774.3

The Rotoun Patents column continues to interpret authorized invention patents from Rotoun Plastic Group. In our previous issue, we focused on energy‑saving and emission‑reduction and introduced a low‑carbon rotomolding polyethylene raw material and its processing method. This time, we turn to plastic‑lining applications and share an invention patent that delivers both wear resistance and high‑temperature performance through formula optimization.

Patent Title: Wear‑Resistant and High‑Temperature‑Resistant Plastic‑Lining Material and Its Preparation Method

Patent No.: ZL 2022 1 1715774.3

In industries including chemical processing, mining, power generation and municipal engineering, plastic‑lined pipes and vessels perform dual functions: metal skeleton for pressure bearing plus plastic lining for anti‑corrosion and wear resistance. These components are constantly exposed to complex media such as acids, alkalis, salts, mineral slurries, fly ash and high‑temperature fluids. Wear, corrosion and thermal aging are the main causes of service failure. Down‑stream manufacturers are faced with persistent practical challenges:

▫️ Rapid wear: When transporting solid‑liquid mixtures such as mineral slurry, fly ash and grit, ordinary PE liners suffer severe inner‑wall erosion and thinning, shortening service life.

▫️ Insufficient high‑temperature resistance: Conventional PE lining materials tend to soften, deform and crack under thermal aging when exposed to high‑temperature media or working conditions, limiting applicable temperatures and scenarios.

▫️ High replacement costs: Once the lining is worn‑through or aged, production must stop for pipe disassembly and re‑lining. Maintenance cycles are long with substantial labor and material expenses.

▫️ Unstable bonding strength: Some filled formulas show poor compatibility with the PE matrix, which may lead to interfacial delamination and blistering after long‑term service.

▫️ Reliance on imported high‑cost materials for demanding conditions: High‑wear and high‑temperature scenarios often require expensive lining solutions, leaving huge room for domestic substitution.

Targeting these industry pain points, Rotoun Plastic Group’s R&D team developed this wear‑resistant and high‑temperature‑resistant plastic‑lining material via matrix resin selection, functional filler compounding and interface modification. This innovation has obtained national invention‑patent authorization.

This patented lining material uses PE resin as the base matrix. PE features inherent wear resistance and thermal aging resistance, laying a foundation for good corrosion resistance and easy processing. Metallic carbon‑black masterbatch is incorporated to further boost wear performance and high‑temperature tolerance. Combined with polyurethane resin for toughening, silane coupling agents for interface reinforcement and a cross‑linking system for structural stabilization, the multi‑component composite achieves balanced wear resistance, high‑temperature performance and favorable processability.Core Technical Highlights of This Patent

✅ PE‑based matrix retaining corrosion resistance and easy‑processing advantages. PE delivers inherent wear resistance and thermal aging performance. As a lining substrate, it maintains excellent chemical stability and supports both rotomolding and extrusion processing.

✅ Polyurethane resin enhances toughness and wear synergy. Polyurethane improves material elasticity and toughness. The material resists brittle fracture under mineral‑slurry erosion and particle impact, extending service life.

✅ Metallic carbon‑black masterbatch improves wear and heat resistance. It not only upgrades anti‑abrasion performance but also stabilizes properties at elevated temperatures.

✅ Silane coupling agent optimizes interfacial bonding. Treated fillers form stronger adhesion between PE matrix and metal skeletons, lowering risks of delamination and blistering.

✅ Cross‑linking system improves thermal stability and mechanical strength. Cross‑linking agents and co‑agents build a stable network structure, inhibiting softening and deformation under high temperature while raising overall mechanical strength.

✅ Formula compatible with existing lining processes. Materials can be processed by conventional extrusion and rotomolding. Existing production lines do not need complete reconstruction for industrial implementation.Practical Application ScenariosScenario 1: Transportation Pipes for Mine Tailings and Mineral Slurry

Mine tailing slurry and concentrate slurry flow at high velocity with hard solid particles, causing severe inner‑pipe abrasion. This patented lining material significantly improves anti‑abrasion capacity, reduces leakage and shutdown maintenance caused by lining penetration, and extends pipe service life.

Scenario 2: Flue‑gas Desulfurization, Ash‑Removal and Fly‑Ash Conveying Systems in Power Plants

Pipes for desulfurization slurry, limestone slurry and fly‑ash transport must withstand elevated temperatures as well as solid‑particle erosion. The synergistic modification of wear‑resistance and heat‑resistance enables more stable operation and reduces unplanned shutdowns.

Scenario 3: Chemical Corrosive‑Medium Pipes and Reactor Vessel Linings

Acid, alkali, salt solutions and certain organic media in chemical production often involve temperature fluctuations. Traditional PE liners tend to age prematurely in hot corrosive environments. While preserving PE’s outstanding chemical resistance, this patented material improves thermal aging performance and broadens the applicable temperature range.

Scenario 4: High‑Wear Sections for Wastewater Treatment and Municipal Water Supply & Drainage

Sludge transfer pipes in wastewater plants, high‑wear sections inside pump stations and sand‑bearing flow segments in municipal water networks are typical high‑risk zones for lining abrasion. This material extends service cycles and lowers maintenance & replacement frequency.Core Values This Patent Brings to Customers

🔹 Extended service life. Improved wear resistance greatly lengthens service cycles of lined pipes and vessels and cuts replacement frequency.

🔹 Broader operating‑temperature range. Enhanced heat resistance enables deployment in higher‑temperature working conditions and can replace certain high‑priced imported lining materials.

🔹 Lower overall operation & maintenance costs. Fewer shutdowns, disassembly and re‑lining work make long‑term maintenance expenses more predictable.

🔹 Higher bonding reliability. Silane‑coupling‑agent‑modified interfaces reduce failure risks such as delamination and blistering for safer operation.

🔹 Great potential for domestic substitution. The PE‑based composite modification route delivers controllable costs and mature processes, supporting local alternatives for high‑end lining materials.

A patent represents an upgrade of material systems and demonstrates Rotoun’s continuous devotion to plastic‑lining application research. Rotoun’s R&D is driven by real‑world operating conditions. Formulas are developed to solve practical industry failures, enabling materials to perform reliably and durably in harsh environments.

The Rotoun Patents column will keep updating. Stay tuned for our next interpretation of Rotoun’s self‑developed patents.

What practical experience or puzzles do you have regarding wear resistance, high‑temperature performance or material selection for plastic‑lined pipes? Feel free to leave your comments and join the discussion.